/*
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* Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/vmalloc.h>
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#include <linux/rhashtable.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_flow_table.h>
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#include <net/netfilter/nf_tables_core.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
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static LIST_HEAD(nf_tables_expressions);
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static LIST_HEAD(nf_tables_objects);
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static LIST_HEAD(nf_tables_flowtables);
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static u64 table_handle;
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enum {
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NFT_VALIDATE_SKIP = 0,
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NFT_VALIDATE_NEED,
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NFT_VALIDATE_DO,
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};
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static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
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static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
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static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
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static const struct rhashtable_params nft_chain_ht_params = {
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.head_offset = offsetof(struct nft_chain, rhlhead),
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.key_offset = offsetof(struct nft_chain, name),
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.hashfn = nft_chain_hash,
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.obj_hashfn = nft_chain_hash_obj,
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.obj_cmpfn = nft_chain_hash_cmp,
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.locks_mul = 1,
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.automatic_shrinking = true,
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};
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static void nft_validate_state_update(struct net *net, u8 new_validate_state)
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{
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switch (net->nft.validate_state) {
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case NFT_VALIDATE_SKIP:
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WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
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break;
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case NFT_VALIDATE_NEED:
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break;
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case NFT_VALIDATE_DO:
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if (new_validate_state == NFT_VALIDATE_NEED)
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return;
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}
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net->nft.validate_state = new_validate_state;
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}
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static void nft_ctx_init(struct nft_ctx *ctx,
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struct net *net,
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const struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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u8 family,
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struct nft_table *table,
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struct nft_chain *chain,
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const struct nlattr * const *nla)
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{
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ctx->net = net;
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ctx->family = family;
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ctx->level = 0;
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ctx->table = table;
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ctx->chain = chain;
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ctx->nla = nla;
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ctx->portid = NETLINK_CB(skb).portid;
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ctx->report = nlmsg_report(nlh);
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ctx->seq = nlh->nlmsg_seq;
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}
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static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
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int msg_type, u32 size, gfp_t gfp)
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{
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struct nft_trans *trans;
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trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
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if (trans == NULL)
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return NULL;
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trans->msg_type = msg_type;
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trans->ctx = *ctx;
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return trans;
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}
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static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
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int msg_type, u32 size)
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{
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return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
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}
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static void nft_trans_destroy(struct nft_trans *trans)
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{
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list_del(&trans->list);
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kfree(trans);
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}
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static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
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{
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struct net *net = ctx->net;
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struct nft_trans *trans;
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if (!nft_set_is_anonymous(set))
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return;
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list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
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switch (trans->msg_type) {
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case NFT_MSG_NEWSET:
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if (nft_trans_set(trans) == set)
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nft_trans_set_bound(trans) = true;
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break;
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case NFT_MSG_NEWSETELEM:
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if (nft_trans_elem_set(trans) == set)
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nft_trans_elem_set_bound(trans) = true;
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break;
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}
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}
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}
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static int nf_tables_register_hook(struct net *net,
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const struct nft_table *table,
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struct nft_chain *chain)
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{
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const struct nft_base_chain *basechain;
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const struct nf_hook_ops *ops;
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if (table->flags & NFT_TABLE_F_DORMANT ||
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!nft_is_base_chain(chain))
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return 0;
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basechain = nft_base_chain(chain);
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ops = &basechain->ops;
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if (basechain->type->ops_register)
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return basechain->type->ops_register(net, ops);
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return nf_register_net_hook(net, ops);
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}
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static void nf_tables_unregister_hook(struct net *net,
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const struct nft_table *table,
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struct nft_chain *chain)
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{
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const struct nft_base_chain *basechain;
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const struct nf_hook_ops *ops;
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if (table->flags & NFT_TABLE_F_DORMANT ||
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!nft_is_base_chain(chain))
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return;
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basechain = nft_base_chain(chain);
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ops = &basechain->ops;
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if (basechain->type->ops_unregister)
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return basechain->type->ops_unregister(net, ops);
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nf_unregister_net_hook(net, ops);
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}
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static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
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if (trans == NULL)
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return -ENOMEM;
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if (msg_type == NFT_MSG_NEWTABLE)
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nft_activate_next(ctx->net, ctx->table);
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list_add_tail(&trans->list, &ctx->net->nft.commit_list);
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return 0;
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}
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static int nft_deltable(struct nft_ctx *ctx)
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{
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int err;
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err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
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if (err < 0)
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return err;
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nft_deactivate_next(ctx->net, ctx->table);
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return err;
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}
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static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
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if (trans == NULL)
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return -ENOMEM;
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if (msg_type == NFT_MSG_NEWCHAIN)
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nft_activate_next(ctx->net, ctx->chain);
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list_add_tail(&trans->list, &ctx->net->nft.commit_list);
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return 0;
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}
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static int nft_delchain(struct nft_ctx *ctx)
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{
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int err;
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err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
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if (err < 0)
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return err;
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ctx->table->use--;
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nft_deactivate_next(ctx->net, ctx->chain);
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return err;
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}
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static void nft_rule_expr_activate(const struct nft_ctx *ctx,
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struct nft_rule *rule)
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{
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struct nft_expr *expr;
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expr = nft_expr_first(rule);
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while (expr != nft_expr_last(rule) && expr->ops) {
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if (expr->ops->activate)
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expr->ops->activate(ctx, expr);
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expr = nft_expr_next(expr);
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}
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}
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static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
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struct nft_rule *rule,
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enum nft_trans_phase phase)
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{
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struct nft_expr *expr;
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expr = nft_expr_first(rule);
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while (expr != nft_expr_last(rule) && expr->ops) {
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if (expr->ops->deactivate)
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expr->ops->deactivate(ctx, expr, phase);
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expr = nft_expr_next(expr);
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}
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}
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static int
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nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
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{
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/* You cannot delete the same rule twice */
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if (nft_is_active_next(ctx->net, rule)) {
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nft_deactivate_next(ctx->net, rule);
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ctx->chain->use--;
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return 0;
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}
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return -ENOENT;
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}
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static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
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struct nft_rule *rule)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
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if (trans == NULL)
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return NULL;
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if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
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nft_trans_rule_id(trans) =
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ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
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}
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nft_trans_rule(trans) = rule;
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list_add_tail(&trans->list, &ctx->net->nft.commit_list);
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return trans;
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}
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static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
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{
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struct nft_trans *trans;
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int err;
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trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
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if (trans == NULL)
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return -ENOMEM;
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err = nf_tables_delrule_deactivate(ctx, rule);
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if (err < 0) {
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nft_trans_destroy(trans);
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return err;
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}
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nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
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return 0;
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}
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static int nft_delrule_by_chain(struct nft_ctx *ctx)
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{
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struct nft_rule *rule;
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int err;
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list_for_each_entry(rule, &ctx->chain->rules, list) {
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if (!nft_is_active_next(ctx->net, rule))
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continue;
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err = nft_delrule(ctx, rule);
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if (err < 0)
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return err;
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}
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return 0;
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}
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static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
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struct nft_set *set)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
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if (trans == NULL)
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return -ENOMEM;
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if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
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nft_trans_set_id(trans) =
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ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
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nft_activate_next(ctx->net, set);
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}
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nft_trans_set(trans) = set;
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list_add_tail(&trans->list, &ctx->net->nft.commit_list);
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return 0;
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}
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static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
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{
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int err;
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err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
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if (err < 0)
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return err;
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nft_deactivate_next(ctx->net, set);
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ctx->table->use--;
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return err;
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}
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static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
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struct nft_object *obj)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
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if (trans == NULL)
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return -ENOMEM;
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if (msg_type == NFT_MSG_NEWOBJ)
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nft_activate_next(ctx->net, obj);
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nft_trans_obj(trans) = obj;
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list_add_tail(&trans->list, &ctx->net->nft.commit_list);
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return 0;
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}
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static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
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{
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int err;
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err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
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if (err < 0)
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return err;
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nft_deactivate_next(ctx->net, obj);
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ctx->table->use--;
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return err;
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}
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static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
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struct nft_flowtable *flowtable)
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{
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struct nft_trans *trans;
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trans = nft_trans_alloc(ctx, msg_type,
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sizeof(struct nft_trans_flowtable));
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if (trans == NULL)
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return -ENOMEM;
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if (msg_type == NFT_MSG_NEWFLOWTABLE)
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nft_activate_next(ctx->net, flowtable);
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nft_trans_flowtable(trans) = flowtable;
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list_add_tail(&trans->list, &ctx->net->nft.commit_list);
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return 0;
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}
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static int nft_delflowtable(struct nft_ctx *ctx,
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struct nft_flowtable *flowtable)
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{
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int err;
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err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
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if (err < 0)
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return err;
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nft_deactivate_next(ctx->net, flowtable);
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ctx->table->use--;
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return err;
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}
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/*
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* Tables
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*/
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static struct nft_table *nft_table_lookup(const struct net *net,
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const struct nlattr *nla,
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u8 family, u8 genmask)
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{
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struct nft_table *table;
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if (nla == NULL)
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return ERR_PTR(-EINVAL);
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list_for_each_entry_rcu(table, &net->nft.tables, list) {
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if (!nla_strcmp(nla, table->name) &&
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table->family == family &&
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nft_active_genmask(table, genmask))
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return table;
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}
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return ERR_PTR(-ENOENT);
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}
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static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
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const struct nlattr *nla,
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u8 genmask)
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{
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struct nft_table *table;
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list_for_each_entry(table, &net->nft.tables, list) {
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if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
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nft_active_genmask(table, genmask))
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return table;
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}
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|
return ERR_PTR(-ENOENT);
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}
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static inline u64 nf_tables_alloc_handle(struct nft_table *table)
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{
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return ++table->hgenerator;
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}
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static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
|
|
static const struct nft_chain_type *
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__nft_chain_type_get(u8 family, enum nft_chain_types type)
|
{
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if (family >= NFPROTO_NUMPROTO ||
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type >= NFT_CHAIN_T_MAX)
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return NULL;
|
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return chain_type[family][type];
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}
|
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static const struct nft_chain_type *
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__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
|
{
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const struct nft_chain_type *type;
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int i;
|
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for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
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type = __nft_chain_type_get(family, i);
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if (!type)
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continue;
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if (!nla_strcmp(nla, type->name))
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return type;
|
}
|
return NULL;
|
}
|
|
/*
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* Loading a module requires dropping mutex that guards the transaction.
|
* A different client might race to start a new transaction meanwhile. Zap the
|
* list of pending transaction and then restore it once the mutex is grabbed
|
* again. Users of this function return EAGAIN which implicitly triggers the
|
* transaction abort path to clean up the list of pending transactions.
|
*/
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#ifdef CONFIG_MODULES
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static void nft_request_module(struct net *net, const char *fmt, ...)
|
{
|
char module_name[MODULE_NAME_LEN];
|
LIST_HEAD(commit_list);
|
va_list args;
|
int ret;
|
|
list_splice_init(&net->nft.commit_list, &commit_list);
|
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va_start(args, fmt);
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ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
|
va_end(args);
|
if (ret >= MODULE_NAME_LEN)
|
return;
|
|
mutex_unlock(&net->nft.commit_mutex);
|
request_module("%s", module_name);
|
mutex_lock(&net->nft.commit_mutex);
|
|
WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
|
list_splice(&commit_list, &net->nft.commit_list);
|
}
|
#endif
|
|
static void lockdep_nfnl_nft_mutex_not_held(void)
|
{
|
#ifdef CONFIG_PROVE_LOCKING
|
if (debug_locks)
|
WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
|
#endif
|
}
|
|
static const struct nft_chain_type *
|
nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
|
u8 family, bool autoload)
|
{
|
const struct nft_chain_type *type;
|
|
type = __nf_tables_chain_type_lookup(nla, family);
|
if (type != NULL)
|
return type;
|
|
lockdep_nfnl_nft_mutex_not_held();
|
#ifdef CONFIG_MODULES
|
if (autoload) {
|
nft_request_module(net, "nft-chain-%u-%.*s", family,
|
nla_len(nla), (const char *)nla_data(nla));
|
type = __nf_tables_chain_type_lookup(nla, family);
|
if (type != NULL)
|
return ERR_PTR(-EAGAIN);
|
}
|
#endif
|
return ERR_PTR(-ENOENT);
|
}
|
|
static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
|
[NFTA_TABLE_NAME] = { .type = NLA_STRING,
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
[NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
|
[NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
|
};
|
|
static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
|
u32 portid, u32 seq, int event, u32 flags,
|
int family, const struct nft_table *table)
|
{
|
struct nlmsghdr *nlh;
|
struct nfgenmsg *nfmsg;
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
|
if (nlh == NULL)
|
goto nla_put_failure;
|
|
nfmsg = nlmsg_data(nlh);
|
nfmsg->nfgen_family = family;
|
nfmsg->version = NFNETLINK_V0;
|
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
|
nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
|
nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
|
nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
|
NFTA_TABLE_PAD))
|
goto nla_put_failure;
|
|
nlmsg_end(skb, nlh);
|
return 0;
|
|
nla_put_failure:
|
nlmsg_trim(skb, nlh);
|
return -1;
|
}
|
|
static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
|
{
|
struct sk_buff *skb;
|
int err;
|
|
if (!ctx->report &&
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
return;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
if (skb == NULL)
|
goto err;
|
|
err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
|
event, 0, ctx->family, ctx->table);
|
if (err < 0) {
|
kfree_skb(skb);
|
goto err;
|
}
|
|
nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
|
ctx->report, GFP_KERNEL);
|
return;
|
err:
|
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
}
|
|
static int nf_tables_dump_tables(struct sk_buff *skb,
|
struct netlink_callback *cb)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
const struct nft_table *table;
|
unsigned int idx = 0, s_idx = cb->args[0];
|
struct net *net = sock_net(skb->sk);
|
int family = nfmsg->nfgen_family;
|
|
rcu_read_lock();
|
cb->seq = net->nft.base_seq;
|
|
list_for_each_entry_rcu(table, &net->nft.tables, list) {
|
if (family != NFPROTO_UNSPEC && family != table->family)
|
continue;
|
|
if (idx < s_idx)
|
goto cont;
|
if (idx > s_idx)
|
memset(&cb->args[1], 0,
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
if (!nft_is_active(net, table))
|
continue;
|
if (nf_tables_fill_table_info(skb, net,
|
NETLINK_CB(cb->skb).portid,
|
cb->nlh->nlmsg_seq,
|
NFT_MSG_NEWTABLE, NLM_F_MULTI,
|
table->family, table) < 0)
|
goto done;
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
cont:
|
idx++;
|
}
|
done:
|
rcu_read_unlock();
|
cb->args[0] = idx;
|
return skb->len;
|
}
|
|
static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
struct netlink_dump_control *c)
|
{
|
int err;
|
|
if (!try_module_get(THIS_MODULE))
|
return -EINVAL;
|
|
rcu_read_unlock();
|
err = netlink_dump_start(nlsk, skb, nlh, c);
|
rcu_read_lock();
|
module_put(THIS_MODULE);
|
|
return err;
|
}
|
|
/* called with rcu_read_lock held */
|
static int nf_tables_gettable(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_cur(net);
|
const struct nft_table *table;
|
struct sk_buff *skb2;
|
int family = nfmsg->nfgen_family;
|
int err;
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
struct netlink_dump_control c = {
|
.dump = nf_tables_dump_tables,
|
.module = THIS_MODULE,
|
};
|
|
return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
|
}
|
|
table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
|
return PTR_ERR(table);
|
}
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
if (!skb2)
|
return -ENOMEM;
|
|
err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
|
nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
|
family, table);
|
if (err < 0)
|
goto err_fill_table_info;
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
err_fill_table_info:
|
kfree_skb(skb2);
|
return err;
|
}
|
|
static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
|
{
|
struct nft_chain *chain;
|
u32 i = 0;
|
|
list_for_each_entry(chain, &table->chains, list) {
|
if (!nft_is_active_next(net, chain))
|
continue;
|
if (!nft_is_base_chain(chain))
|
continue;
|
|
if (cnt && i++ == cnt)
|
break;
|
|
nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
|
}
|
}
|
|
static int nf_tables_table_enable(struct net *net, struct nft_table *table)
|
{
|
struct nft_chain *chain;
|
int err, i = 0;
|
|
list_for_each_entry(chain, &table->chains, list) {
|
if (!nft_is_active_next(net, chain))
|
continue;
|
if (!nft_is_base_chain(chain))
|
continue;
|
|
err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
|
if (err < 0)
|
goto err;
|
|
i++;
|
}
|
return 0;
|
err:
|
if (i)
|
nft_table_disable(net, table, i);
|
return err;
|
}
|
|
static void nf_tables_table_disable(struct net *net, struct nft_table *table)
|
{
|
nft_table_disable(net, table, 0);
|
}
|
|
static int nf_tables_updtable(struct nft_ctx *ctx)
|
{
|
struct nft_trans *trans;
|
u32 flags;
|
int ret = 0;
|
|
if (!ctx->nla[NFTA_TABLE_FLAGS])
|
return 0;
|
|
flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
|
if (flags & ~NFT_TABLE_F_DORMANT)
|
return -EINVAL;
|
|
if (flags == ctx->table->flags)
|
return 0;
|
|
trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
|
sizeof(struct nft_trans_table));
|
if (trans == NULL)
|
return -ENOMEM;
|
|
if ((flags & NFT_TABLE_F_DORMANT) &&
|
!(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
|
nft_trans_table_enable(trans) = false;
|
} else if (!(flags & NFT_TABLE_F_DORMANT) &&
|
ctx->table->flags & NFT_TABLE_F_DORMANT) {
|
ret = nf_tables_table_enable(ctx->net, ctx->table);
|
if (ret >= 0) {
|
ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
|
nft_trans_table_enable(trans) = true;
|
}
|
}
|
if (ret < 0)
|
goto err;
|
|
nft_trans_table_update(trans) = true;
|
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
|
return 0;
|
err:
|
nft_trans_destroy(trans);
|
return ret;
|
}
|
|
static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
|
{
|
const char *name = data;
|
|
return jhash(name, strlen(name), seed);
|
}
|
|
static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
|
{
|
const struct nft_chain *chain = data;
|
|
return nft_chain_hash(chain->name, 0, seed);
|
}
|
|
static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
|
const void *ptr)
|
{
|
const struct nft_chain *chain = ptr;
|
const char *name = arg->key;
|
|
return strcmp(chain->name, name);
|
}
|
|
static int nf_tables_newtable(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_next(net);
|
int family = nfmsg->nfgen_family;
|
const struct nlattr *attr;
|
struct nft_table *table;
|
u32 flags = 0;
|
struct nft_ctx ctx;
|
int err;
|
|
lockdep_assert_held(&net->nft.commit_mutex);
|
attr = nla[NFTA_TABLE_NAME];
|
table = nft_table_lookup(net, attr, family, genmask);
|
if (IS_ERR(table)) {
|
if (PTR_ERR(table) != -ENOENT)
|
return PTR_ERR(table);
|
} else {
|
if (nlh->nlmsg_flags & NLM_F_EXCL) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return -EEXIST;
|
}
|
if (nlh->nlmsg_flags & NLM_F_REPLACE)
|
return -EOPNOTSUPP;
|
|
nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
|
return nf_tables_updtable(&ctx);
|
}
|
|
if (nla[NFTA_TABLE_FLAGS]) {
|
flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
|
if (flags & ~NFT_TABLE_F_DORMANT)
|
return -EINVAL;
|
}
|
|
err = -ENOMEM;
|
table = kzalloc(sizeof(*table), GFP_KERNEL);
|
if (table == NULL)
|
goto err_kzalloc;
|
|
table->name = nla_strdup(attr, GFP_KERNEL);
|
if (table->name == NULL)
|
goto err_strdup;
|
|
err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
|
if (err)
|
goto err_chain_ht;
|
|
INIT_LIST_HEAD(&table->chains);
|
INIT_LIST_HEAD(&table->sets);
|
INIT_LIST_HEAD(&table->objects);
|
INIT_LIST_HEAD(&table->flowtables);
|
table->family = family;
|
table->flags = flags;
|
table->handle = ++table_handle;
|
|
nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
|
err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
|
if (err < 0)
|
goto err_trans;
|
|
list_add_tail_rcu(&table->list, &net->nft.tables);
|
return 0;
|
err_trans:
|
rhltable_destroy(&table->chains_ht);
|
err_chain_ht:
|
kfree(table->name);
|
err_strdup:
|
kfree(table);
|
err_kzalloc:
|
return err;
|
}
|
|
static int nft_flush_table(struct nft_ctx *ctx)
|
{
|
struct nft_flowtable *flowtable, *nft;
|
struct nft_chain *chain, *nc;
|
struct nft_object *obj, *ne;
|
struct nft_set *set, *ns;
|
int err;
|
|
list_for_each_entry(chain, &ctx->table->chains, list) {
|
if (!nft_is_active_next(ctx->net, chain))
|
continue;
|
|
ctx->chain = chain;
|
|
err = nft_delrule_by_chain(ctx);
|
if (err < 0)
|
goto out;
|
}
|
|
list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
|
if (!nft_is_active_next(ctx->net, set))
|
continue;
|
|
if (nft_set_is_anonymous(set) &&
|
!list_empty(&set->bindings))
|
continue;
|
|
err = nft_delset(ctx, set);
|
if (err < 0)
|
goto out;
|
}
|
|
list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
|
if (!nft_is_active_next(ctx->net, flowtable))
|
continue;
|
|
err = nft_delflowtable(ctx, flowtable);
|
if (err < 0)
|
goto out;
|
}
|
|
list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
|
if (!nft_is_active_next(ctx->net, obj))
|
continue;
|
|
err = nft_delobj(ctx, obj);
|
if (err < 0)
|
goto out;
|
}
|
|
list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
|
if (!nft_is_active_next(ctx->net, chain))
|
continue;
|
|
ctx->chain = chain;
|
|
err = nft_delchain(ctx);
|
if (err < 0)
|
goto out;
|
}
|
|
err = nft_deltable(ctx);
|
out:
|
return err;
|
}
|
|
static int nft_flush(struct nft_ctx *ctx, int family)
|
{
|
struct nft_table *table, *nt;
|
const struct nlattr * const *nla = ctx->nla;
|
int err = 0;
|
|
list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
|
if (family != AF_UNSPEC && table->family != family)
|
continue;
|
|
ctx->family = table->family;
|
|
if (!nft_is_active_next(ctx->net, table))
|
continue;
|
|
if (nla[NFTA_TABLE_NAME] &&
|
nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
|
continue;
|
|
ctx->table = table;
|
|
err = nft_flush_table(ctx);
|
if (err < 0)
|
goto out;
|
}
|
out:
|
return err;
|
}
|
|
static int nf_tables_deltable(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_next(net);
|
int family = nfmsg->nfgen_family;
|
const struct nlattr *attr;
|
struct nft_table *table;
|
struct nft_ctx ctx;
|
|
nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
|
if (family == AF_UNSPEC ||
|
(!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
|
return nft_flush(&ctx, family);
|
|
if (nla[NFTA_TABLE_HANDLE]) {
|
attr = nla[NFTA_TABLE_HANDLE];
|
table = nft_table_lookup_byhandle(net, attr, genmask);
|
} else {
|
attr = nla[NFTA_TABLE_NAME];
|
table = nft_table_lookup(net, attr, family, genmask);
|
}
|
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return PTR_ERR(table);
|
}
|
|
if (nlh->nlmsg_flags & NLM_F_NONREC &&
|
table->use > 0)
|
return -EBUSY;
|
|
ctx.family = family;
|
ctx.table = table;
|
|
return nft_flush_table(&ctx);
|
}
|
|
static void nf_tables_table_destroy(struct nft_ctx *ctx)
|
{
|
if (WARN_ON(ctx->table->use > 0))
|
return;
|
|
rhltable_destroy(&ctx->table->chains_ht);
|
kfree(ctx->table->name);
|
kfree(ctx->table);
|
}
|
|
void nft_register_chain_type(const struct nft_chain_type *ctype)
|
{
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
return;
|
}
|
chain_type[ctype->family][ctype->type] = ctype;
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
}
|
EXPORT_SYMBOL_GPL(nft_register_chain_type);
|
|
void nft_unregister_chain_type(const struct nft_chain_type *ctype)
|
{
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
chain_type[ctype->family][ctype->type] = NULL;
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
}
|
EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
|
|
/*
|
* Chains
|
*/
|
|
static struct nft_chain *
|
nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
|
{
|
struct nft_chain *chain;
|
|
list_for_each_entry(chain, &table->chains, list) {
|
if (chain->handle == handle &&
|
nft_active_genmask(chain, genmask))
|
return chain;
|
}
|
|
return ERR_PTR(-ENOENT);
|
}
|
|
static bool lockdep_commit_lock_is_held(struct net *net)
|
{
|
#ifdef CONFIG_PROVE_LOCKING
|
return lockdep_is_held(&net->nft.commit_mutex);
|
#else
|
return true;
|
#endif
|
}
|
|
static struct nft_chain *nft_chain_lookup(struct net *net,
|
struct nft_table *table,
|
const struct nlattr *nla, u8 genmask)
|
{
|
char search[NFT_CHAIN_MAXNAMELEN + 1];
|
struct rhlist_head *tmp, *list;
|
struct nft_chain *chain;
|
|
if (nla == NULL)
|
return ERR_PTR(-EINVAL);
|
|
nla_strlcpy(search, nla, sizeof(search));
|
|
WARN_ON(!rcu_read_lock_held() &&
|
!lockdep_commit_lock_is_held(net));
|
|
chain = ERR_PTR(-ENOENT);
|
rcu_read_lock();
|
list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
|
if (!list)
|
goto out_unlock;
|
|
rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
|
if (nft_active_genmask(chain, genmask))
|
goto out_unlock;
|
}
|
chain = ERR_PTR(-ENOENT);
|
out_unlock:
|
rcu_read_unlock();
|
return chain;
|
}
|
|
static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
|
[NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
[NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
|
[NFTA_CHAIN_NAME] = { .type = NLA_STRING,
|
.len = NFT_CHAIN_MAXNAMELEN - 1 },
|
[NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
|
[NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
|
[NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
|
.len = NFT_MODULE_AUTOLOAD_LIMIT },
|
[NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
|
};
|
|
static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
|
[NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
|
[NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
|
[NFTA_HOOK_DEV] = { .type = NLA_STRING,
|
.len = IFNAMSIZ - 1 },
|
};
|
|
static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
|
{
|
struct nft_stats *cpu_stats, total;
|
struct nlattr *nest;
|
unsigned int seq;
|
u64 pkts, bytes;
|
int cpu;
|
|
if (!stats)
|
return 0;
|
|
memset(&total, 0, sizeof(total));
|
for_each_possible_cpu(cpu) {
|
cpu_stats = per_cpu_ptr(stats, cpu);
|
do {
|
seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
|
pkts = cpu_stats->pkts;
|
bytes = cpu_stats->bytes;
|
} while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
|
total.pkts += pkts;
|
total.bytes += bytes;
|
}
|
nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
|
if (nest == NULL)
|
goto nla_put_failure;
|
|
if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
|
NFTA_COUNTER_PAD) ||
|
nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
|
NFTA_COUNTER_PAD))
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
return 0;
|
|
nla_put_failure:
|
return -ENOSPC;
|
}
|
|
static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
|
u32 portid, u32 seq, int event, u32 flags,
|
int family, const struct nft_table *table,
|
const struct nft_chain *chain)
|
{
|
struct nlmsghdr *nlh;
|
struct nfgenmsg *nfmsg;
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
|
if (nlh == NULL)
|
goto nla_put_failure;
|
|
nfmsg = nlmsg_data(nlh);
|
nfmsg->nfgen_family = family;
|
nfmsg->version = NFNETLINK_V0;
|
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
|
goto nla_put_failure;
|
if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
|
NFTA_CHAIN_PAD))
|
goto nla_put_failure;
|
if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
|
goto nla_put_failure;
|
|
if (nft_is_base_chain(chain)) {
|
const struct nft_base_chain *basechain = nft_base_chain(chain);
|
const struct nf_hook_ops *ops = &basechain->ops;
|
struct nft_stats __percpu *stats;
|
struct nlattr *nest;
|
|
nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
|
if (nest == NULL)
|
goto nla_put_failure;
|
if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
|
goto nla_put_failure;
|
if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
|
goto nla_put_failure;
|
if (basechain->dev_name[0] &&
|
nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
|
goto nla_put_failure;
|
nla_nest_end(skb, nest);
|
|
if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
|
htonl(basechain->policy)))
|
goto nla_put_failure;
|
|
if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
|
goto nla_put_failure;
|
|
stats = rcu_dereference_check(basechain->stats,
|
lockdep_commit_lock_is_held(net));
|
if (nft_dump_stats(skb, stats))
|
goto nla_put_failure;
|
}
|
|
if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
|
goto nla_put_failure;
|
|
nlmsg_end(skb, nlh);
|
return 0;
|
|
nla_put_failure:
|
nlmsg_trim(skb, nlh);
|
return -1;
|
}
|
|
static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
|
{
|
struct sk_buff *skb;
|
int err;
|
|
if (!ctx->report &&
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
return;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
if (skb == NULL)
|
goto err;
|
|
err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
|
event, 0, ctx->family, ctx->table,
|
ctx->chain);
|
if (err < 0) {
|
kfree_skb(skb);
|
goto err;
|
}
|
|
nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
|
ctx->report, GFP_KERNEL);
|
return;
|
err:
|
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
}
|
|
static int nf_tables_dump_chains(struct sk_buff *skb,
|
struct netlink_callback *cb)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
const struct nft_table *table;
|
const struct nft_chain *chain;
|
unsigned int idx = 0, s_idx = cb->args[0];
|
struct net *net = sock_net(skb->sk);
|
int family = nfmsg->nfgen_family;
|
|
rcu_read_lock();
|
cb->seq = net->nft.base_seq;
|
|
list_for_each_entry_rcu(table, &net->nft.tables, list) {
|
if (family != NFPROTO_UNSPEC && family != table->family)
|
continue;
|
|
list_for_each_entry_rcu(chain, &table->chains, list) {
|
if (idx < s_idx)
|
goto cont;
|
if (idx > s_idx)
|
memset(&cb->args[1], 0,
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
if (!nft_is_active(net, chain))
|
continue;
|
if (nf_tables_fill_chain_info(skb, net,
|
NETLINK_CB(cb->skb).portid,
|
cb->nlh->nlmsg_seq,
|
NFT_MSG_NEWCHAIN,
|
NLM_F_MULTI,
|
table->family, table,
|
chain) < 0)
|
goto done;
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
cont:
|
idx++;
|
}
|
}
|
done:
|
rcu_read_unlock();
|
cb->args[0] = idx;
|
return skb->len;
|
}
|
|
/* called with rcu_read_lock held */
|
static int nf_tables_getchain(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_cur(net);
|
const struct nft_chain *chain;
|
struct nft_table *table;
|
struct sk_buff *skb2;
|
int family = nfmsg->nfgen_family;
|
int err;
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
struct netlink_dump_control c = {
|
.dump = nf_tables_dump_chains,
|
.module = THIS_MODULE,
|
};
|
|
return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
|
}
|
|
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
|
if (IS_ERR(chain)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
|
return PTR_ERR(chain);
|
}
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
if (!skb2)
|
return -ENOMEM;
|
|
err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
|
nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
|
family, table, chain);
|
if (err < 0)
|
goto err_fill_chain_info;
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
err_fill_chain_info:
|
kfree_skb(skb2);
|
return err;
|
}
|
|
static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
|
[NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
|
[NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
|
};
|
|
static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
|
{
|
struct nlattr *tb[NFTA_COUNTER_MAX+1];
|
struct nft_stats __percpu *newstats;
|
struct nft_stats *stats;
|
int err;
|
|
err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
|
NULL);
|
if (err < 0)
|
return ERR_PTR(err);
|
|
if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
|
return ERR_PTR(-EINVAL);
|
|
newstats = netdev_alloc_pcpu_stats(struct nft_stats);
|
if (newstats == NULL)
|
return ERR_PTR(-ENOMEM);
|
|
/* Restore old counters on this cpu, no problem. Per-cpu statistics
|
* are not exposed to userspace.
|
*/
|
preempt_disable();
|
stats = this_cpu_ptr(newstats);
|
stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
|
stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
|
preempt_enable();
|
|
return newstats;
|
}
|
|
static void nft_chain_stats_replace(struct net *net,
|
struct nft_base_chain *chain,
|
struct nft_stats __percpu *newstats)
|
{
|
struct nft_stats __percpu *oldstats;
|
|
if (newstats == NULL)
|
return;
|
|
if (rcu_access_pointer(chain->stats)) {
|
oldstats = rcu_dereference_protected(chain->stats,
|
lockdep_commit_lock_is_held(net));
|
rcu_assign_pointer(chain->stats, newstats);
|
synchronize_rcu();
|
free_percpu(oldstats);
|
} else {
|
rcu_assign_pointer(chain->stats, newstats);
|
static_branch_inc(&nft_counters_enabled);
|
}
|
}
|
|
static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
|
{
|
struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
|
struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
|
|
if (g0 != g1)
|
kvfree(g1);
|
kvfree(g0);
|
|
/* should be NULL either via abort or via successful commit */
|
WARN_ON_ONCE(chain->rules_next);
|
kvfree(chain->rules_next);
|
}
|
|
static void nf_tables_chain_destroy(struct nft_ctx *ctx)
|
{
|
struct nft_chain *chain = ctx->chain;
|
|
if (WARN_ON(chain->use > 0))
|
return;
|
|
/* no concurrent access possible anymore */
|
nf_tables_chain_free_chain_rules(chain);
|
|
if (nft_is_base_chain(chain)) {
|
struct nft_base_chain *basechain = nft_base_chain(chain);
|
|
module_put(basechain->type->owner);
|
if (rcu_access_pointer(basechain->stats)) {
|
static_branch_dec(&nft_counters_enabled);
|
free_percpu(rcu_dereference_raw(basechain->stats));
|
}
|
kfree(chain->name);
|
kfree(basechain);
|
} else {
|
kfree(chain->name);
|
kfree(chain);
|
}
|
}
|
|
struct nft_chain_hook {
|
u32 num;
|
s32 priority;
|
const struct nft_chain_type *type;
|
struct net_device *dev;
|
};
|
|
static int nft_chain_parse_hook(struct net *net,
|
const struct nlattr * const nla[],
|
struct nft_chain_hook *hook, u8 family,
|
bool autoload)
|
{
|
struct nlattr *ha[NFTA_HOOK_MAX + 1];
|
const struct nft_chain_type *type;
|
struct net_device *dev;
|
int err;
|
|
lockdep_assert_held(&net->nft.commit_mutex);
|
lockdep_nfnl_nft_mutex_not_held();
|
|
err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
|
nft_hook_policy, NULL);
|
if (err < 0)
|
return err;
|
|
if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
|
ha[NFTA_HOOK_PRIORITY] == NULL)
|
return -EINVAL;
|
|
hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
|
hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
|
|
type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
|
if (!type)
|
return -EOPNOTSUPP;
|
|
if (nla[NFTA_CHAIN_TYPE]) {
|
type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
|
family, autoload);
|
if (IS_ERR(type))
|
return PTR_ERR(type);
|
}
|
if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
|
return -EOPNOTSUPP;
|
|
if (type->type == NFT_CHAIN_T_NAT &&
|
hook->priority <= NF_IP_PRI_CONNTRACK)
|
return -EOPNOTSUPP;
|
|
if (!try_module_get(type->owner))
|
return -ENOENT;
|
|
hook->type = type;
|
|
hook->dev = NULL;
|
if (family == NFPROTO_NETDEV) {
|
char ifname[IFNAMSIZ];
|
|
if (!ha[NFTA_HOOK_DEV]) {
|
module_put(type->owner);
|
return -EOPNOTSUPP;
|
}
|
|
nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
|
dev = __dev_get_by_name(net, ifname);
|
if (!dev) {
|
module_put(type->owner);
|
return -ENOENT;
|
}
|
hook->dev = dev;
|
} else if (ha[NFTA_HOOK_DEV]) {
|
module_put(type->owner);
|
return -EOPNOTSUPP;
|
}
|
|
return 0;
|
}
|
|
static void nft_chain_release_hook(struct nft_chain_hook *hook)
|
{
|
module_put(hook->type->owner);
|
}
|
|
struct nft_rules_old {
|
struct rcu_head h;
|
struct nft_rule **start;
|
};
|
|
static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
|
unsigned int alloc)
|
{
|
if (alloc > INT_MAX)
|
return NULL;
|
|
alloc += 1; /* NULL, ends rules */
|
if (sizeof(struct nft_rule *) > INT_MAX / alloc)
|
return NULL;
|
|
alloc *= sizeof(struct nft_rule *);
|
alloc += sizeof(struct nft_rules_old);
|
|
return kvmalloc(alloc, GFP_KERNEL);
|
}
|
|
static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
|
u8 policy)
|
{
|
const struct nlattr * const *nla = ctx->nla;
|
struct nft_table *table = ctx->table;
|
struct nft_base_chain *basechain;
|
struct nft_stats __percpu *stats;
|
struct net *net = ctx->net;
|
struct nft_chain *chain;
|
struct nft_rule **rules;
|
int err;
|
|
if (table->use == UINT_MAX)
|
return -EOVERFLOW;
|
|
if (nla[NFTA_CHAIN_HOOK]) {
|
struct nft_chain_hook hook;
|
struct nf_hook_ops *ops;
|
|
err = nft_chain_parse_hook(net, nla, &hook, family, true);
|
if (err < 0)
|
return err;
|
|
basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
|
if (basechain == NULL) {
|
nft_chain_release_hook(&hook);
|
return -ENOMEM;
|
}
|
|
if (hook.dev != NULL)
|
strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
|
|
if (nla[NFTA_CHAIN_COUNTERS]) {
|
stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
|
if (IS_ERR(stats)) {
|
nft_chain_release_hook(&hook);
|
kfree(basechain);
|
return PTR_ERR(stats);
|
}
|
rcu_assign_pointer(basechain->stats, stats);
|
static_branch_inc(&nft_counters_enabled);
|
}
|
|
basechain->type = hook.type;
|
chain = &basechain->chain;
|
|
ops = &basechain->ops;
|
ops->pf = family;
|
ops->hooknum = hook.num;
|
ops->priority = hook.priority;
|
ops->priv = chain;
|
ops->hook = hook.type->hooks[ops->hooknum];
|
ops->dev = hook.dev;
|
|
chain->flags |= NFT_BASE_CHAIN;
|
basechain->policy = policy;
|
} else {
|
chain = kzalloc(sizeof(*chain), GFP_KERNEL);
|
if (chain == NULL)
|
return -ENOMEM;
|
}
|
ctx->chain = chain;
|
|
INIT_LIST_HEAD(&chain->rules);
|
chain->handle = nf_tables_alloc_handle(table);
|
chain->table = table;
|
chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
|
if (!chain->name) {
|
err = -ENOMEM;
|
goto err1;
|
}
|
|
rules = nf_tables_chain_alloc_rules(chain, 0);
|
if (!rules) {
|
err = -ENOMEM;
|
goto err1;
|
}
|
|
*rules = NULL;
|
rcu_assign_pointer(chain->rules_gen_0, rules);
|
rcu_assign_pointer(chain->rules_gen_1, rules);
|
|
err = nf_tables_register_hook(net, table, chain);
|
if (err < 0)
|
goto err1;
|
|
err = rhltable_insert_key(&table->chains_ht, chain->name,
|
&chain->rhlhead, nft_chain_ht_params);
|
if (err)
|
goto err2;
|
|
err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
|
if (err < 0) {
|
rhltable_remove(&table->chains_ht, &chain->rhlhead,
|
nft_chain_ht_params);
|
goto err2;
|
}
|
|
table->use++;
|
list_add_tail_rcu(&chain->list, &table->chains);
|
|
return 0;
|
err2:
|
nf_tables_unregister_hook(net, table, chain);
|
err1:
|
nf_tables_chain_destroy(ctx);
|
|
return err;
|
}
|
|
static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy)
|
{
|
const struct nlattr * const *nla = ctx->nla;
|
struct nft_table *table = ctx->table;
|
struct nft_chain *chain = ctx->chain;
|
struct nft_base_chain *basechain;
|
struct nft_stats *stats = NULL;
|
struct nft_chain_hook hook;
|
struct nf_hook_ops *ops;
|
struct nft_trans *trans;
|
int err;
|
|
if (nla[NFTA_CHAIN_HOOK]) {
|
if (!nft_is_base_chain(chain))
|
return -EBUSY;
|
|
err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
|
false);
|
if (err < 0)
|
return err;
|
|
basechain = nft_base_chain(chain);
|
if (basechain->type != hook.type) {
|
nft_chain_release_hook(&hook);
|
return -EBUSY;
|
}
|
|
ops = &basechain->ops;
|
if (ops->hooknum != hook.num ||
|
ops->priority != hook.priority ||
|
ops->dev != hook.dev) {
|
nft_chain_release_hook(&hook);
|
return -EBUSY;
|
}
|
nft_chain_release_hook(&hook);
|
}
|
|
if (nla[NFTA_CHAIN_HANDLE] &&
|
nla[NFTA_CHAIN_NAME]) {
|
struct nft_chain *chain2;
|
|
chain2 = nft_chain_lookup(ctx->net, table,
|
nla[NFTA_CHAIN_NAME], genmask);
|
if (!IS_ERR(chain2))
|
return -EEXIST;
|
}
|
|
if (nla[NFTA_CHAIN_COUNTERS]) {
|
if (!nft_is_base_chain(chain))
|
return -EOPNOTSUPP;
|
|
stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
|
if (IS_ERR(stats))
|
return PTR_ERR(stats);
|
}
|
|
err = -ENOMEM;
|
trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
|
sizeof(struct nft_trans_chain));
|
if (trans == NULL)
|
goto err;
|
|
nft_trans_chain_stats(trans) = stats;
|
nft_trans_chain_update(trans) = true;
|
|
if (nla[NFTA_CHAIN_POLICY])
|
nft_trans_chain_policy(trans) = policy;
|
else
|
nft_trans_chain_policy(trans) = -1;
|
|
if (nla[NFTA_CHAIN_HANDLE] &&
|
nla[NFTA_CHAIN_NAME]) {
|
struct nft_trans *tmp;
|
char *name;
|
|
err = -ENOMEM;
|
name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
|
if (!name)
|
goto err;
|
|
err = -EEXIST;
|
list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
|
if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
|
tmp->ctx.table == table &&
|
nft_trans_chain_update(tmp) &&
|
nft_trans_chain_name(tmp) &&
|
strcmp(name, nft_trans_chain_name(tmp)) == 0) {
|
kfree(name);
|
goto err;
|
}
|
}
|
|
nft_trans_chain_name(trans) = name;
|
}
|
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
|
|
return 0;
|
err:
|
free_percpu(stats);
|
kfree(trans);
|
return err;
|
}
|
|
static int nf_tables_newchain(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_next(net);
|
int family = nfmsg->nfgen_family;
|
const struct nlattr *attr;
|
struct nft_table *table;
|
struct nft_chain *chain;
|
u8 policy = NF_ACCEPT;
|
struct nft_ctx ctx;
|
u64 handle = 0;
|
|
lockdep_assert_held(&net->nft.commit_mutex);
|
|
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
chain = NULL;
|
attr = nla[NFTA_CHAIN_NAME];
|
|
if (nla[NFTA_CHAIN_HANDLE]) {
|
handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
|
chain = nft_chain_lookup_byhandle(table, handle, genmask);
|
if (IS_ERR(chain)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
|
return PTR_ERR(chain);
|
}
|
attr = nla[NFTA_CHAIN_HANDLE];
|
} else {
|
chain = nft_chain_lookup(net, table, attr, genmask);
|
if (IS_ERR(chain)) {
|
if (PTR_ERR(chain) != -ENOENT) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return PTR_ERR(chain);
|
}
|
chain = NULL;
|
}
|
}
|
|
if (nla[NFTA_CHAIN_POLICY]) {
|
if (chain != NULL &&
|
!nft_is_base_chain(chain)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
|
return -EOPNOTSUPP;
|
}
|
|
if (chain == NULL &&
|
nla[NFTA_CHAIN_HOOK] == NULL) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
|
return -EOPNOTSUPP;
|
}
|
|
policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
|
switch (policy) {
|
case NF_DROP:
|
case NF_ACCEPT:
|
break;
|
default:
|
return -EINVAL;
|
}
|
}
|
|
nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
|
|
if (chain != NULL) {
|
if (nlh->nlmsg_flags & NLM_F_EXCL) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return -EEXIST;
|
}
|
if (nlh->nlmsg_flags & NLM_F_REPLACE)
|
return -EOPNOTSUPP;
|
|
return nf_tables_updchain(&ctx, genmask, policy);
|
}
|
|
return nf_tables_addchain(&ctx, family, genmask, policy);
|
}
|
|
static int nf_tables_delchain(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_next(net);
|
int family = nfmsg->nfgen_family;
|
const struct nlattr *attr;
|
struct nft_table *table;
|
struct nft_chain *chain;
|
struct nft_rule *rule;
|
struct nft_ctx ctx;
|
u64 handle;
|
u32 use;
|
int err;
|
|
table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
if (nla[NFTA_CHAIN_HANDLE]) {
|
attr = nla[NFTA_CHAIN_HANDLE];
|
handle = be64_to_cpu(nla_get_be64(attr));
|
chain = nft_chain_lookup_byhandle(table, handle, genmask);
|
} else {
|
attr = nla[NFTA_CHAIN_NAME];
|
chain = nft_chain_lookup(net, table, attr, genmask);
|
}
|
if (IS_ERR(chain)) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return PTR_ERR(chain);
|
}
|
|
if (nlh->nlmsg_flags & NLM_F_NONREC &&
|
chain->use > 0)
|
return -EBUSY;
|
|
nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
|
|
use = chain->use;
|
list_for_each_entry(rule, &chain->rules, list) {
|
if (!nft_is_active_next(net, rule))
|
continue;
|
use--;
|
|
err = nft_delrule(&ctx, rule);
|
if (err < 0)
|
return err;
|
}
|
|
/* There are rules and elements that are still holding references to us,
|
* we cannot do a recursive removal in this case.
|
*/
|
if (use > 0) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return -EBUSY;
|
}
|
|
return nft_delchain(&ctx);
|
}
|
|
/*
|
* Expressions
|
*/
|
|
/**
|
* nft_register_expr - register nf_tables expr type
|
* @ops: expr type
|
*
|
* Registers the expr type for use with nf_tables. Returns zero on
|
* success or a negative errno code otherwise.
|
*/
|
int nft_register_expr(struct nft_expr_type *type)
|
{
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
if (type->family == NFPROTO_UNSPEC)
|
list_add_tail_rcu(&type->list, &nf_tables_expressions);
|
else
|
list_add_rcu(&type->list, &nf_tables_expressions);
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(nft_register_expr);
|
|
/**
|
* nft_unregister_expr - unregister nf_tables expr type
|
* @ops: expr type
|
*
|
* Unregisters the expr typefor use with nf_tables.
|
*/
|
void nft_unregister_expr(struct nft_expr_type *type)
|
{
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
list_del_rcu(&type->list);
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
}
|
EXPORT_SYMBOL_GPL(nft_unregister_expr);
|
|
static const struct nft_expr_type *__nft_expr_type_get(u8 family,
|
struct nlattr *nla)
|
{
|
const struct nft_expr_type *type;
|
|
list_for_each_entry(type, &nf_tables_expressions, list) {
|
if (!nla_strcmp(nla, type->name) &&
|
(!type->family || type->family == family))
|
return type;
|
}
|
return NULL;
|
}
|
|
static const struct nft_expr_type *nft_expr_type_get(struct net *net,
|
u8 family,
|
struct nlattr *nla)
|
{
|
const struct nft_expr_type *type;
|
|
if (nla == NULL)
|
return ERR_PTR(-EINVAL);
|
|
type = __nft_expr_type_get(family, nla);
|
if (type != NULL && try_module_get(type->owner))
|
return type;
|
|
lockdep_nfnl_nft_mutex_not_held();
|
#ifdef CONFIG_MODULES
|
if (type == NULL) {
|
nft_request_module(net, "nft-expr-%u-%.*s", family,
|
nla_len(nla), (char *)nla_data(nla));
|
if (__nft_expr_type_get(family, nla))
|
return ERR_PTR(-EAGAIN);
|
|
nft_request_module(net, "nft-expr-%.*s",
|
nla_len(nla), (char *)nla_data(nla));
|
if (__nft_expr_type_get(family, nla))
|
return ERR_PTR(-EAGAIN);
|
}
|
#endif
|
return ERR_PTR(-ENOENT);
|
}
|
|
static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
|
[NFTA_EXPR_NAME] = { .type = NLA_STRING,
|
.len = NFT_MODULE_AUTOLOAD_LIMIT },
|
[NFTA_EXPR_DATA] = { .type = NLA_NESTED },
|
};
|
|
static int nf_tables_fill_expr_info(struct sk_buff *skb,
|
const struct nft_expr *expr)
|
{
|
if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
|
goto nla_put_failure;
|
|
if (expr->ops->dump) {
|
struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
|
if (data == NULL)
|
goto nla_put_failure;
|
if (expr->ops->dump(skb, expr) < 0)
|
goto nla_put_failure;
|
nla_nest_end(skb, data);
|
}
|
|
return skb->len;
|
|
nla_put_failure:
|
return -1;
|
};
|
|
int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
|
const struct nft_expr *expr)
|
{
|
struct nlattr *nest;
|
|
nest = nla_nest_start(skb, attr);
|
if (!nest)
|
goto nla_put_failure;
|
if (nf_tables_fill_expr_info(skb, expr) < 0)
|
goto nla_put_failure;
|
nla_nest_end(skb, nest);
|
return 0;
|
|
nla_put_failure:
|
return -1;
|
}
|
|
struct nft_expr_info {
|
const struct nft_expr_ops *ops;
|
struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
|
};
|
|
static int nf_tables_expr_parse(const struct nft_ctx *ctx,
|
const struct nlattr *nla,
|
struct nft_expr_info *info)
|
{
|
const struct nft_expr_type *type;
|
const struct nft_expr_ops *ops;
|
struct nlattr *tb[NFTA_EXPR_MAX + 1];
|
int err;
|
|
err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
|
if (err < 0)
|
return err;
|
|
type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
|
if (IS_ERR(type))
|
return PTR_ERR(type);
|
|
if (tb[NFTA_EXPR_DATA]) {
|
err = nla_parse_nested(info->tb, type->maxattr,
|
tb[NFTA_EXPR_DATA], type->policy, NULL);
|
if (err < 0)
|
goto err1;
|
} else
|
memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
|
|
if (type->select_ops != NULL) {
|
ops = type->select_ops(ctx,
|
(const struct nlattr * const *)info->tb);
|
if (IS_ERR(ops)) {
|
err = PTR_ERR(ops);
|
goto err1;
|
}
|
} else
|
ops = type->ops;
|
|
info->ops = ops;
|
return 0;
|
|
err1:
|
module_put(type->owner);
|
return err;
|
}
|
|
static int nf_tables_newexpr(const struct nft_ctx *ctx,
|
const struct nft_expr_info *info,
|
struct nft_expr *expr)
|
{
|
const struct nft_expr_ops *ops = info->ops;
|
int err;
|
|
expr->ops = ops;
|
if (ops->init) {
|
err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
|
if (err < 0)
|
goto err1;
|
}
|
|
return 0;
|
err1:
|
expr->ops = NULL;
|
return err;
|
}
|
|
static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
|
struct nft_expr *expr)
|
{
|
const struct nft_expr_type *type = expr->ops->type;
|
|
if (expr->ops->destroy)
|
expr->ops->destroy(ctx, expr);
|
module_put(type->owner);
|
}
|
|
struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
|
const struct nlattr *nla)
|
{
|
struct nft_expr_info info;
|
struct nft_expr *expr;
|
struct module *owner;
|
int err;
|
|
err = nf_tables_expr_parse(ctx, nla, &info);
|
if (err < 0)
|
goto err1;
|
|
err = -ENOMEM;
|
expr = kzalloc(info.ops->size, GFP_KERNEL);
|
if (expr == NULL)
|
goto err2;
|
|
err = nf_tables_newexpr(ctx, &info, expr);
|
if (err < 0)
|
goto err3;
|
|
return expr;
|
err3:
|
kfree(expr);
|
err2:
|
owner = info.ops->type->owner;
|
if (info.ops->type->release_ops)
|
info.ops->type->release_ops(info.ops);
|
|
module_put(owner);
|
err1:
|
return ERR_PTR(err);
|
}
|
|
void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
|
{
|
nf_tables_expr_destroy(ctx, expr);
|
kfree(expr);
|
}
|
|
/*
|
* Rules
|
*/
|
|
static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
|
u64 handle)
|
{
|
struct nft_rule *rule;
|
|
// FIXME: this sucks
|
list_for_each_entry_rcu(rule, &chain->rules, list) {
|
if (handle == rule->handle)
|
return rule;
|
}
|
|
return ERR_PTR(-ENOENT);
|
}
|
|
static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
|
const struct nlattr *nla)
|
{
|
if (nla == NULL)
|
return ERR_PTR(-EINVAL);
|
|
return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
|
}
|
|
static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
|
[NFTA_RULE_TABLE] = { .type = NLA_STRING,
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
[NFTA_RULE_CHAIN] = { .type = NLA_STRING,
|
.len = NFT_CHAIN_MAXNAMELEN - 1 },
|
[NFTA_RULE_HANDLE] = { .type = NLA_U64 },
|
[NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
|
[NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
|
[NFTA_RULE_POSITION] = { .type = NLA_U64 },
|
[NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
|
.len = NFT_USERDATA_MAXLEN },
|
[NFTA_RULE_ID] = { .type = NLA_U32 },
|
};
|
|
static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
|
u32 portid, u32 seq, int event,
|
u32 flags, int family,
|
const struct nft_table *table,
|
const struct nft_chain *chain,
|
const struct nft_rule *rule)
|
{
|
struct nlmsghdr *nlh;
|
struct nfgenmsg *nfmsg;
|
const struct nft_expr *expr, *next;
|
struct nlattr *list;
|
const struct nft_rule *prule;
|
u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
|
nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
|
if (nlh == NULL)
|
goto nla_put_failure;
|
|
nfmsg = nlmsg_data(nlh);
|
nfmsg->nfgen_family = family;
|
nfmsg->version = NFNETLINK_V0;
|
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
|
goto nla_put_failure;
|
if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
|
goto nla_put_failure;
|
if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
|
NFTA_RULE_PAD))
|
goto nla_put_failure;
|
|
if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
|
prule = list_prev_entry(rule, list);
|
if (nla_put_be64(skb, NFTA_RULE_POSITION,
|
cpu_to_be64(prule->handle),
|
NFTA_RULE_PAD))
|
goto nla_put_failure;
|
}
|
|
list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
|
if (list == NULL)
|
goto nla_put_failure;
|
nft_rule_for_each_expr(expr, next, rule) {
|
if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
|
goto nla_put_failure;
|
}
|
nla_nest_end(skb, list);
|
|
if (rule->udata) {
|
struct nft_userdata *udata = nft_userdata(rule);
|
if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
|
udata->data) < 0)
|
goto nla_put_failure;
|
}
|
|
nlmsg_end(skb, nlh);
|
return 0;
|
|
nla_put_failure:
|
nlmsg_trim(skb, nlh);
|
return -1;
|
}
|
|
static void nf_tables_rule_notify(const struct nft_ctx *ctx,
|
const struct nft_rule *rule, int event)
|
{
|
struct sk_buff *skb;
|
int err;
|
|
if (!ctx->report &&
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
return;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
if (skb == NULL)
|
goto err;
|
|
err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
|
event, 0, ctx->family, ctx->table,
|
ctx->chain, rule);
|
if (err < 0) {
|
kfree_skb(skb);
|
goto err;
|
}
|
|
nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
|
ctx->report, GFP_KERNEL);
|
return;
|
err:
|
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
}
|
|
struct nft_rule_dump_ctx {
|
char *table;
|
char *chain;
|
};
|
|
static int nf_tables_dump_rules(struct sk_buff *skb,
|
struct netlink_callback *cb)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
const struct nft_rule_dump_ctx *ctx = cb->data;
|
const struct nft_table *table;
|
const struct nft_chain *chain;
|
const struct nft_rule *rule;
|
unsigned int idx = 0, s_idx = cb->args[0];
|
struct net *net = sock_net(skb->sk);
|
int family = nfmsg->nfgen_family;
|
|
rcu_read_lock();
|
cb->seq = net->nft.base_seq;
|
|
list_for_each_entry_rcu(table, &net->nft.tables, list) {
|
if (family != NFPROTO_UNSPEC && family != table->family)
|
continue;
|
|
if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
|
continue;
|
|
list_for_each_entry_rcu(chain, &table->chains, list) {
|
if (ctx && ctx->chain &&
|
strcmp(ctx->chain, chain->name) != 0)
|
continue;
|
|
list_for_each_entry_rcu(rule, &chain->rules, list) {
|
if (!nft_is_active(net, rule))
|
goto cont;
|
if (idx < s_idx)
|
goto cont;
|
if (idx > s_idx)
|
memset(&cb->args[1], 0,
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
|
cb->nlh->nlmsg_seq,
|
NFT_MSG_NEWRULE,
|
NLM_F_MULTI | NLM_F_APPEND,
|
table->family,
|
table, chain, rule) < 0)
|
goto done;
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
cont:
|
idx++;
|
}
|
}
|
}
|
done:
|
rcu_read_unlock();
|
|
cb->args[0] = idx;
|
return skb->len;
|
}
|
|
static int nf_tables_dump_rules_start(struct netlink_callback *cb)
|
{
|
const struct nlattr * const *nla = cb->data;
|
struct nft_rule_dump_ctx *ctx = NULL;
|
|
if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
|
ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
|
if (!ctx)
|
return -ENOMEM;
|
|
if (nla[NFTA_RULE_TABLE]) {
|
ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
|
GFP_ATOMIC);
|
if (!ctx->table) {
|
kfree(ctx);
|
return -ENOMEM;
|
}
|
}
|
if (nla[NFTA_RULE_CHAIN]) {
|
ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
|
GFP_ATOMIC);
|
if (!ctx->chain) {
|
kfree(ctx->table);
|
kfree(ctx);
|
return -ENOMEM;
|
}
|
}
|
}
|
|
cb->data = ctx;
|
return 0;
|
}
|
|
static int nf_tables_dump_rules_done(struct netlink_callback *cb)
|
{
|
struct nft_rule_dump_ctx *ctx = cb->data;
|
|
if (ctx) {
|
kfree(ctx->table);
|
kfree(ctx->chain);
|
kfree(ctx);
|
}
|
return 0;
|
}
|
|
/* called with rcu_read_lock held */
|
static int nf_tables_getrule(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_cur(net);
|
const struct nft_chain *chain;
|
const struct nft_rule *rule;
|
struct nft_table *table;
|
struct sk_buff *skb2;
|
int family = nfmsg->nfgen_family;
|
int err;
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
struct netlink_dump_control c = {
|
.start= nf_tables_dump_rules_start,
|
.dump = nf_tables_dump_rules,
|
.done = nf_tables_dump_rules_done,
|
.module = THIS_MODULE,
|
.data = (void *)nla,
|
};
|
|
return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
|
}
|
|
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
|
if (IS_ERR(chain)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
|
return PTR_ERR(chain);
|
}
|
|
rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
|
if (IS_ERR(rule)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
|
return PTR_ERR(rule);
|
}
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
if (!skb2)
|
return -ENOMEM;
|
|
err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
|
nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
|
family, table, chain, rule);
|
if (err < 0)
|
goto err_fill_rule_info;
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
err_fill_rule_info:
|
kfree_skb(skb2);
|
return err;
|
}
|
|
static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
|
struct nft_rule *rule)
|
{
|
struct nft_expr *expr, *next;
|
|
lockdep_assert_held(&ctx->net->nft.commit_mutex);
|
/*
|
* Careful: some expressions might not be initialized in case this
|
* is called on error from nf_tables_newrule().
|
*/
|
expr = nft_expr_first(rule);
|
while (expr != nft_expr_last(rule) && expr->ops) {
|
next = nft_expr_next(expr);
|
nf_tables_expr_destroy(ctx, expr);
|
expr = next;
|
}
|
kfree(rule);
|
}
|
|
static void nf_tables_rule_release(const struct nft_ctx *ctx,
|
struct nft_rule *rule)
|
{
|
nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
|
nf_tables_rule_destroy(ctx, rule);
|
}
|
|
int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
|
{
|
struct nft_expr *expr, *last;
|
const struct nft_data *data;
|
struct nft_rule *rule;
|
int err;
|
|
if (ctx->level == NFT_JUMP_STACK_SIZE)
|
return -EMLINK;
|
|
list_for_each_entry(rule, &chain->rules, list) {
|
if (!nft_is_active_next(ctx->net, rule))
|
continue;
|
|
nft_rule_for_each_expr(expr, last, rule) {
|
if (!expr->ops->validate)
|
continue;
|
|
err = expr->ops->validate(ctx, expr, &data);
|
if (err < 0)
|
return err;
|
}
|
}
|
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(nft_chain_validate);
|
|
static int nft_table_validate(struct net *net, const struct nft_table *table)
|
{
|
struct nft_chain *chain;
|
struct nft_ctx ctx = {
|
.net = net,
|
.family = table->family,
|
};
|
int err;
|
|
list_for_each_entry(chain, &table->chains, list) {
|
if (!nft_is_base_chain(chain))
|
continue;
|
|
ctx.chain = chain;
|
err = nft_chain_validate(&ctx, chain);
|
if (err < 0)
|
return err;
|
}
|
|
return 0;
|
}
|
|
#define NFT_RULE_MAXEXPRS 128
|
|
static int nf_tables_newrule(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_next(net);
|
struct nft_expr_info *info = NULL;
|
int family = nfmsg->nfgen_family;
|
struct nft_table *table;
|
struct nft_chain *chain;
|
struct nft_rule *rule, *old_rule = NULL;
|
struct nft_userdata *udata;
|
struct nft_trans *trans = NULL;
|
struct nft_expr *expr;
|
struct nft_ctx ctx;
|
struct nlattr *tmp;
|
unsigned int size, i, n, ulen = 0, usize = 0;
|
int err, rem;
|
u64 handle, pos_handle;
|
|
lockdep_assert_held(&net->nft.commit_mutex);
|
|
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
|
if (IS_ERR(chain)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
|
return PTR_ERR(chain);
|
}
|
|
if (nla[NFTA_RULE_HANDLE]) {
|
handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
|
rule = __nft_rule_lookup(chain, handle);
|
if (IS_ERR(rule)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
|
return PTR_ERR(rule);
|
}
|
|
if (nlh->nlmsg_flags & NLM_F_EXCL) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
|
return -EEXIST;
|
}
|
if (nlh->nlmsg_flags & NLM_F_REPLACE)
|
old_rule = rule;
|
else
|
return -EOPNOTSUPP;
|
} else {
|
if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
|
nlh->nlmsg_flags & NLM_F_REPLACE)
|
return -EINVAL;
|
handle = nf_tables_alloc_handle(table);
|
|
if (chain->use == UINT_MAX)
|
return -EOVERFLOW;
|
|
if (nla[NFTA_RULE_POSITION]) {
|
pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
|
old_rule = __nft_rule_lookup(chain, pos_handle);
|
if (IS_ERR(old_rule)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
|
return PTR_ERR(old_rule);
|
}
|
}
|
}
|
|
nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
|
|
n = 0;
|
size = 0;
|
if (nla[NFTA_RULE_EXPRESSIONS]) {
|
info = kvmalloc_array(NFT_RULE_MAXEXPRS,
|
sizeof(struct nft_expr_info),
|
GFP_KERNEL);
|
if (!info)
|
return -ENOMEM;
|
|
nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
|
err = -EINVAL;
|
if (nla_type(tmp) != NFTA_LIST_ELEM)
|
goto err1;
|
if (n == NFT_RULE_MAXEXPRS)
|
goto err1;
|
err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
|
if (err < 0)
|
goto err1;
|
size += info[n].ops->size;
|
n++;
|
}
|
}
|
/* Check for overflow of dlen field */
|
err = -EFBIG;
|
if (size >= 1 << 12)
|
goto err1;
|
|
if (nla[NFTA_RULE_USERDATA]) {
|
ulen = nla_len(nla[NFTA_RULE_USERDATA]);
|
if (ulen > 0)
|
usize = sizeof(struct nft_userdata) + ulen;
|
}
|
|
err = -ENOMEM;
|
rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
|
if (rule == NULL)
|
goto err1;
|
|
nft_activate_next(net, rule);
|
|
rule->handle = handle;
|
rule->dlen = size;
|
rule->udata = ulen ? 1 : 0;
|
|
if (ulen) {
|
udata = nft_userdata(rule);
|
udata->len = ulen - 1;
|
nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
|
}
|
|
expr = nft_expr_first(rule);
|
for (i = 0; i < n; i++) {
|
err = nf_tables_newexpr(&ctx, &info[i], expr);
|
if (err < 0)
|
goto err2;
|
|
if (info[i].ops->validate)
|
nft_validate_state_update(net, NFT_VALIDATE_NEED);
|
|
info[i].ops = NULL;
|
expr = nft_expr_next(expr);
|
}
|
|
if (nlh->nlmsg_flags & NLM_F_REPLACE) {
|
trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
|
if (trans == NULL) {
|
err = -ENOMEM;
|
goto err2;
|
}
|
err = nft_delrule(&ctx, old_rule);
|
if (err < 0) {
|
nft_trans_destroy(trans);
|
goto err2;
|
}
|
|
list_add_tail_rcu(&rule->list, &old_rule->list);
|
} else {
|
if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
|
err = -ENOMEM;
|
goto err2;
|
}
|
|
if (nlh->nlmsg_flags & NLM_F_APPEND) {
|
if (old_rule)
|
list_add_rcu(&rule->list, &old_rule->list);
|
else
|
list_add_tail_rcu(&rule->list, &chain->rules);
|
} else {
|
if (old_rule)
|
list_add_tail_rcu(&rule->list, &old_rule->list);
|
else
|
list_add_rcu(&rule->list, &chain->rules);
|
}
|
}
|
kvfree(info);
|
chain->use++;
|
|
if (net->nft.validate_state == NFT_VALIDATE_DO)
|
return nft_table_validate(net, table);
|
|
return 0;
|
err2:
|
nf_tables_rule_release(&ctx, rule);
|
err1:
|
for (i = 0; i < n; i++) {
|
if (info[i].ops) {
|
module_put(info[i].ops->type->owner);
|
if (info[i].ops->type->release_ops)
|
info[i].ops->type->release_ops(info[i].ops);
|
}
|
}
|
kvfree(info);
|
return err;
|
}
|
|
static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
|
const struct nlattr *nla)
|
{
|
u32 id = ntohl(nla_get_be32(nla));
|
struct nft_trans *trans;
|
|
list_for_each_entry(trans, &net->nft.commit_list, list) {
|
struct nft_rule *rule = nft_trans_rule(trans);
|
|
if (trans->msg_type == NFT_MSG_NEWRULE &&
|
id == nft_trans_rule_id(trans))
|
return rule;
|
}
|
return ERR_PTR(-ENOENT);
|
}
|
|
static int nf_tables_delrule(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_next(net);
|
struct nft_table *table;
|
struct nft_chain *chain = NULL;
|
struct nft_rule *rule;
|
int family = nfmsg->nfgen_family, err = 0;
|
struct nft_ctx ctx;
|
|
table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
if (nla[NFTA_RULE_CHAIN]) {
|
chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
|
genmask);
|
if (IS_ERR(chain)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
|
return PTR_ERR(chain);
|
}
|
}
|
|
nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
|
|
if (chain) {
|
if (nla[NFTA_RULE_HANDLE]) {
|
rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
|
if (IS_ERR(rule)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
|
return PTR_ERR(rule);
|
}
|
|
err = nft_delrule(&ctx, rule);
|
} else if (nla[NFTA_RULE_ID]) {
|
rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
|
if (IS_ERR(rule)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
|
return PTR_ERR(rule);
|
}
|
|
err = nft_delrule(&ctx, rule);
|
} else {
|
err = nft_delrule_by_chain(&ctx);
|
}
|
} else {
|
list_for_each_entry(chain, &table->chains, list) {
|
if (!nft_is_active_next(net, chain))
|
continue;
|
|
ctx.chain = chain;
|
err = nft_delrule_by_chain(&ctx);
|
if (err < 0)
|
break;
|
}
|
}
|
|
return err;
|
}
|
|
/*
|
* Sets
|
*/
|
|
static LIST_HEAD(nf_tables_set_types);
|
|
int nft_register_set(struct nft_set_type *type)
|
{
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
list_add_tail_rcu(&type->list, &nf_tables_set_types);
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(nft_register_set);
|
|
void nft_unregister_set(struct nft_set_type *type)
|
{
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
list_del_rcu(&type->list);
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
}
|
EXPORT_SYMBOL_GPL(nft_unregister_set);
|
|
#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
|
NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
|
NFT_SET_EVAL)
|
|
static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
|
{
|
return (flags & type->features) == (flags & NFT_SET_FEATURES);
|
}
|
|
/*
|
* Select a set implementation based on the data characteristics and the
|
* given policy. The total memory use might not be known if no size is
|
* given, in that case the amount of memory per element is used.
|
*/
|
static const struct nft_set_ops *
|
nft_select_set_ops(const struct nft_ctx *ctx,
|
const struct nlattr * const nla[],
|
const struct nft_set_desc *desc,
|
enum nft_set_policies policy)
|
{
|
const struct nft_set_ops *ops, *bops;
|
struct nft_set_estimate est, best;
|
const struct nft_set_type *type;
|
u32 flags = 0;
|
|
lockdep_assert_held(&ctx->net->nft.commit_mutex);
|
lockdep_nfnl_nft_mutex_not_held();
|
#ifdef CONFIG_MODULES
|
if (list_empty(&nf_tables_set_types)) {
|
nft_request_module(ctx->net, "nft-set");
|
if (!list_empty(&nf_tables_set_types))
|
return ERR_PTR(-EAGAIN);
|
}
|
#endif
|
if (nla[NFTA_SET_FLAGS] != NULL)
|
flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
|
|
bops = NULL;
|
best.size = ~0;
|
best.lookup = ~0;
|
best.space = ~0;
|
|
list_for_each_entry(type, &nf_tables_set_types, list) {
|
ops = &type->ops;
|
|
if (!nft_set_ops_candidate(type, flags))
|
continue;
|
if (!ops->estimate(desc, flags, &est))
|
continue;
|
|
switch (policy) {
|
case NFT_SET_POL_PERFORMANCE:
|
if (est.lookup < best.lookup)
|
break;
|
if (est.lookup == best.lookup &&
|
est.space < best.space)
|
break;
|
continue;
|
case NFT_SET_POL_MEMORY:
|
if (!desc->size) {
|
if (est.space < best.space)
|
break;
|
if (est.space == best.space &&
|
est.lookup < best.lookup)
|
break;
|
} else if (est.size < best.size || !bops) {
|
break;
|
}
|
continue;
|
default:
|
break;
|
}
|
|
if (!try_module_get(type->owner))
|
continue;
|
if (bops != NULL)
|
module_put(to_set_type(bops)->owner);
|
|
bops = ops;
|
best = est;
|
}
|
|
if (bops != NULL)
|
return bops;
|
|
return ERR_PTR(-EOPNOTSUPP);
|
}
|
|
static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
|
[NFTA_SET_TABLE] = { .type = NLA_STRING,
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
[NFTA_SET_NAME] = { .type = NLA_STRING,
|
.len = NFT_SET_MAXNAMELEN - 1 },
|
[NFTA_SET_FLAGS] = { .type = NLA_U32 },
|
[NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
|
[NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
|
[NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
|
[NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
|
[NFTA_SET_POLICY] = { .type = NLA_U32 },
|
[NFTA_SET_DESC] = { .type = NLA_NESTED },
|
[NFTA_SET_ID] = { .type = NLA_U32 },
|
[NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
|
[NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
|
[NFTA_SET_USERDATA] = { .type = NLA_BINARY,
|
.len = NFT_USERDATA_MAXLEN },
|
[NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
|
[NFTA_SET_HANDLE] = { .type = NLA_U64 },
|
};
|
|
static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
|
[NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
|
};
|
|
static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
|
const struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack,
|
u8 genmask)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
int family = nfmsg->nfgen_family;
|
struct nft_table *table = NULL;
|
|
if (nla[NFTA_SET_TABLE] != NULL) {
|
table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
|
genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
|
return PTR_ERR(table);
|
}
|
}
|
|
nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
|
return 0;
|
}
|
|
static struct nft_set *nft_set_lookup(const struct nft_table *table,
|
const struct nlattr *nla, u8 genmask)
|
{
|
struct nft_set *set;
|
|
if (nla == NULL)
|
return ERR_PTR(-EINVAL);
|
|
list_for_each_entry_rcu(set, &table->sets, list) {
|
if (!nla_strcmp(nla, set->name) &&
|
nft_active_genmask(set, genmask))
|
return set;
|
}
|
return ERR_PTR(-ENOENT);
|
}
|
|
static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
|
const struct nlattr *nla,
|
u8 genmask)
|
{
|
struct nft_set *set;
|
|
list_for_each_entry(set, &table->sets, list) {
|
if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
|
nft_active_genmask(set, genmask))
|
return set;
|
}
|
return ERR_PTR(-ENOENT);
|
}
|
|
static struct nft_set *nft_set_lookup_byid(const struct net *net,
|
const struct nlattr *nla, u8 genmask)
|
{
|
struct nft_trans *trans;
|
u32 id = ntohl(nla_get_be32(nla));
|
|
list_for_each_entry(trans, &net->nft.commit_list, list) {
|
if (trans->msg_type == NFT_MSG_NEWSET) {
|
struct nft_set *set = nft_trans_set(trans);
|
|
if (id == nft_trans_set_id(trans) &&
|
nft_active_genmask(set, genmask))
|
return set;
|
}
|
}
|
return ERR_PTR(-ENOENT);
|
}
|
|
struct nft_set *nft_set_lookup_global(const struct net *net,
|
const struct nft_table *table,
|
const struct nlattr *nla_set_name,
|
const struct nlattr *nla_set_id,
|
u8 genmask)
|
{
|
struct nft_set *set;
|
|
set = nft_set_lookup(table, nla_set_name, genmask);
|
if (IS_ERR(set)) {
|
if (!nla_set_id)
|
return set;
|
|
set = nft_set_lookup_byid(net, nla_set_id, genmask);
|
}
|
return set;
|
}
|
EXPORT_SYMBOL_GPL(nft_set_lookup_global);
|
|
static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
|
const char *name)
|
{
|
const struct nft_set *i;
|
const char *p;
|
unsigned long *inuse;
|
unsigned int n = 0, min = 0;
|
|
p = strchr(name, '%');
|
if (p != NULL) {
|
if (p[1] != 'd' || strchr(p + 2, '%'))
|
return -EINVAL;
|
|
inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
|
if (inuse == NULL)
|
return -ENOMEM;
|
cont:
|
list_for_each_entry(i, &ctx->table->sets, list) {
|
int tmp;
|
|
if (!nft_is_active_next(ctx->net, set))
|
continue;
|
if (!sscanf(i->name, name, &tmp))
|
continue;
|
if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
|
continue;
|
|
set_bit(tmp - min, inuse);
|
}
|
|
n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
|
if (n >= BITS_PER_BYTE * PAGE_SIZE) {
|
min += BITS_PER_BYTE * PAGE_SIZE;
|
memset(inuse, 0, PAGE_SIZE);
|
goto cont;
|
}
|
free_page((unsigned long)inuse);
|
}
|
|
set->name = kasprintf(GFP_KERNEL, name, min + n);
|
if (!set->name)
|
return -ENOMEM;
|
|
list_for_each_entry(i, &ctx->table->sets, list) {
|
if (!nft_is_active_next(ctx->net, i))
|
continue;
|
if (!strcmp(set->name, i->name)) {
|
kfree(set->name);
|
return -ENFILE;
|
}
|
}
|
return 0;
|
}
|
|
static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
|
{
|
u64 ms = be64_to_cpu(nla_get_be64(nla));
|
u64 max = (u64)(~((u64)0));
|
|
max = div_u64(max, NSEC_PER_MSEC);
|
if (ms >= max)
|
return -ERANGE;
|
|
ms *= NSEC_PER_MSEC;
|
*result = nsecs_to_jiffies64(ms);
|
return 0;
|
}
|
|
static __be64 nf_jiffies64_to_msecs(u64 input)
|
{
|
u64 ms = jiffies64_to_nsecs(input);
|
|
return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC));
|
}
|
|
static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
|
const struct nft_set *set, u16 event, u16 flags)
|
{
|
struct nfgenmsg *nfmsg;
|
struct nlmsghdr *nlh;
|
struct nlattr *desc;
|
u32 portid = ctx->portid;
|
u32 seq = ctx->seq;
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
|
flags);
|
if (nlh == NULL)
|
goto nla_put_failure;
|
|
nfmsg = nlmsg_data(nlh);
|
nfmsg->nfgen_family = ctx->family;
|
nfmsg->version = NFNETLINK_V0;
|
nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
|
|
if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
|
goto nla_put_failure;
|
if (nla_put_string(skb, NFTA_SET_NAME, set->name))
|
goto nla_put_failure;
|
if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
|
NFTA_SET_PAD))
|
goto nla_put_failure;
|
if (set->flags != 0)
|
if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
|
goto nla_put_failure;
|
if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
|
goto nla_put_failure;
|
if (set->flags & NFT_SET_MAP) {
|
if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
|
goto nla_put_failure;
|
if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
|
goto nla_put_failure;
|
}
|
if (set->flags & NFT_SET_OBJECT &&
|
nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
|
goto nla_put_failure;
|
|
if (set->timeout &&
|
nla_put_be64(skb, NFTA_SET_TIMEOUT,
|
nf_jiffies64_to_msecs(set->timeout),
|
NFTA_SET_PAD))
|
goto nla_put_failure;
|
if (set->gc_int &&
|
nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
|
goto nla_put_failure;
|
|
if (set->policy != NFT_SET_POL_PERFORMANCE) {
|
if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
|
goto nla_put_failure;
|
}
|
|
if (set->udata &&
|
nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
|
goto nla_put_failure;
|
|
desc = nla_nest_start(skb, NFTA_SET_DESC);
|
if (desc == NULL)
|
goto nla_put_failure;
|
if (set->size &&
|
nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
|
goto nla_put_failure;
|
nla_nest_end(skb, desc);
|
|
nlmsg_end(skb, nlh);
|
return 0;
|
|
nla_put_failure:
|
nlmsg_trim(skb, nlh);
|
return -1;
|
}
|
|
static void nf_tables_set_notify(const struct nft_ctx *ctx,
|
const struct nft_set *set, int event,
|
gfp_t gfp_flags)
|
{
|
struct sk_buff *skb;
|
u32 portid = ctx->portid;
|
int err;
|
|
if (!ctx->report &&
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
return;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
|
if (skb == NULL)
|
goto err;
|
|
err = nf_tables_fill_set(skb, ctx, set, event, 0);
|
if (err < 0) {
|
kfree_skb(skb);
|
goto err;
|
}
|
|
nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
|
gfp_flags);
|
return;
|
err:
|
nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
}
|
|
static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
|
{
|
const struct nft_set *set;
|
unsigned int idx, s_idx = cb->args[0];
|
struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
|
struct net *net = sock_net(skb->sk);
|
struct nft_ctx *ctx = cb->data, ctx_set;
|
|
if (cb->args[1])
|
return skb->len;
|
|
rcu_read_lock();
|
cb->seq = net->nft.base_seq;
|
|
list_for_each_entry_rcu(table, &net->nft.tables, list) {
|
if (ctx->family != NFPROTO_UNSPEC &&
|
ctx->family != table->family)
|
continue;
|
|
if (ctx->table && ctx->table != table)
|
continue;
|
|
if (cur_table) {
|
if (cur_table != table)
|
continue;
|
|
cur_table = NULL;
|
}
|
idx = 0;
|
list_for_each_entry_rcu(set, &table->sets, list) {
|
if (idx < s_idx)
|
goto cont;
|
if (!nft_is_active(net, set))
|
goto cont;
|
|
ctx_set = *ctx;
|
ctx_set.table = table;
|
ctx_set.family = table->family;
|
|
if (nf_tables_fill_set(skb, &ctx_set, set,
|
NFT_MSG_NEWSET,
|
NLM_F_MULTI) < 0) {
|
cb->args[0] = idx;
|
cb->args[2] = (unsigned long) table;
|
goto done;
|
}
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
cont:
|
idx++;
|
}
|
if (s_idx)
|
s_idx = 0;
|
}
|
cb->args[1] = 1;
|
done:
|
rcu_read_unlock();
|
return skb->len;
|
}
|
|
static int nf_tables_dump_sets_start(struct netlink_callback *cb)
|
{
|
struct nft_ctx *ctx_dump = NULL;
|
|
ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
|
if (ctx_dump == NULL)
|
return -ENOMEM;
|
|
cb->data = ctx_dump;
|
return 0;
|
}
|
|
static int nf_tables_dump_sets_done(struct netlink_callback *cb)
|
{
|
kfree(cb->data);
|
return 0;
|
}
|
|
/* called with rcu_read_lock held */
|
static int nf_tables_getset(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
u8 genmask = nft_genmask_cur(net);
|
const struct nft_set *set;
|
struct nft_ctx ctx;
|
struct sk_buff *skb2;
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
int err;
|
|
/* Verify existence before starting dump */
|
err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
|
genmask);
|
if (err < 0)
|
return err;
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
struct netlink_dump_control c = {
|
.start = nf_tables_dump_sets_start,
|
.dump = nf_tables_dump_sets,
|
.done = nf_tables_dump_sets_done,
|
.data = &ctx,
|
.module = THIS_MODULE,
|
};
|
|
return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
|
}
|
|
/* Only accept unspec with dump */
|
if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
|
return -EAFNOSUPPORT;
|
if (!nla[NFTA_SET_TABLE])
|
return -EINVAL;
|
|
set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
|
if (IS_ERR(set))
|
return PTR_ERR(set);
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
if (skb2 == NULL)
|
return -ENOMEM;
|
|
err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
|
if (err < 0)
|
goto err_fill_set_info;
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
err_fill_set_info:
|
kfree_skb(skb2);
|
return err;
|
}
|
|
static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
|
struct nft_set_desc *desc,
|
const struct nlattr *nla)
|
{
|
struct nlattr *da[NFTA_SET_DESC_MAX + 1];
|
int err;
|
|
err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
|
nft_set_desc_policy, NULL);
|
if (err < 0)
|
return err;
|
|
if (da[NFTA_SET_DESC_SIZE] != NULL)
|
desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
|
|
return 0;
|
}
|
|
static int nf_tables_newset(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_next(net);
|
int family = nfmsg->nfgen_family;
|
const struct nft_set_ops *ops;
|
struct nft_table *table;
|
struct nft_set *set;
|
struct nft_ctx ctx;
|
char *name;
|
u64 size;
|
u64 timeout;
|
u32 ktype, dtype, flags, policy, gc_int, objtype;
|
struct nft_set_desc desc;
|
unsigned char *udata;
|
u16 udlen;
|
int err;
|
|
if (nla[NFTA_SET_TABLE] == NULL ||
|
nla[NFTA_SET_NAME] == NULL ||
|
nla[NFTA_SET_KEY_LEN] == NULL ||
|
nla[NFTA_SET_ID] == NULL)
|
return -EINVAL;
|
|
memset(&desc, 0, sizeof(desc));
|
|
ktype = NFT_DATA_VALUE;
|
if (nla[NFTA_SET_KEY_TYPE] != NULL) {
|
ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
|
if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
|
return -EINVAL;
|
}
|
|
desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
|
if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
|
return -EINVAL;
|
|
flags = 0;
|
if (nla[NFTA_SET_FLAGS] != NULL) {
|
flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
|
if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
|
NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
|
NFT_SET_MAP | NFT_SET_EVAL |
|
NFT_SET_OBJECT))
|
return -EOPNOTSUPP;
|
/* Only one of these operations is supported */
|
if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
|
(NFT_SET_MAP | NFT_SET_OBJECT))
|
return -EOPNOTSUPP;
|
if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
|
(NFT_SET_EVAL | NFT_SET_OBJECT))
|
return -EOPNOTSUPP;
|
}
|
|
dtype = 0;
|
if (nla[NFTA_SET_DATA_TYPE] != NULL) {
|
if (!(flags & NFT_SET_MAP))
|
return -EINVAL;
|
|
dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
|
if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
|
dtype != NFT_DATA_VERDICT)
|
return -EINVAL;
|
|
if (dtype != NFT_DATA_VERDICT) {
|
if (nla[NFTA_SET_DATA_LEN] == NULL)
|
return -EINVAL;
|
desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
|
if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
|
return -EINVAL;
|
} else
|
desc.dlen = sizeof(struct nft_verdict);
|
} else if (flags & NFT_SET_MAP)
|
return -EINVAL;
|
|
if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
|
if (!(flags & NFT_SET_OBJECT))
|
return -EINVAL;
|
|
objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
|
if (objtype == NFT_OBJECT_UNSPEC ||
|
objtype > NFT_OBJECT_MAX)
|
return -EOPNOTSUPP;
|
} else if (flags & NFT_SET_OBJECT)
|
return -EINVAL;
|
else
|
objtype = NFT_OBJECT_UNSPEC;
|
|
timeout = 0;
|
if (nla[NFTA_SET_TIMEOUT] != NULL) {
|
if (!(flags & NFT_SET_TIMEOUT))
|
return -EINVAL;
|
|
err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
|
if (err)
|
return err;
|
}
|
gc_int = 0;
|
if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
|
if (!(flags & NFT_SET_TIMEOUT))
|
return -EINVAL;
|
gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
|
}
|
|
policy = NFT_SET_POL_PERFORMANCE;
|
if (nla[NFTA_SET_POLICY] != NULL)
|
policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
|
|
if (nla[NFTA_SET_DESC] != NULL) {
|
err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
|
if (err < 0)
|
return err;
|
}
|
|
table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
|
|
set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
|
if (IS_ERR(set)) {
|
if (PTR_ERR(set) != -ENOENT) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
|
return PTR_ERR(set);
|
}
|
} else {
|
if (nlh->nlmsg_flags & NLM_F_EXCL) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
|
return -EEXIST;
|
}
|
if (nlh->nlmsg_flags & NLM_F_REPLACE)
|
return -EOPNOTSUPP;
|
|
return 0;
|
}
|
|
if (!(nlh->nlmsg_flags & NLM_F_CREATE))
|
return -ENOENT;
|
|
ops = nft_select_set_ops(&ctx, nla, &desc, policy);
|
if (IS_ERR(ops))
|
return PTR_ERR(ops);
|
|
udlen = 0;
|
if (nla[NFTA_SET_USERDATA])
|
udlen = nla_len(nla[NFTA_SET_USERDATA]);
|
|
size = 0;
|
if (ops->privsize != NULL)
|
size = ops->privsize(nla, &desc);
|
|
set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
|
if (!set) {
|
err = -ENOMEM;
|
goto err1;
|
}
|
|
name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
|
if (!name) {
|
err = -ENOMEM;
|
goto err2;
|
}
|
|
err = nf_tables_set_alloc_name(&ctx, set, name);
|
kfree(name);
|
if (err < 0)
|
goto err2;
|
|
udata = NULL;
|
if (udlen) {
|
udata = set->data + size;
|
nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
|
}
|
|
INIT_LIST_HEAD(&set->bindings);
|
set->table = table;
|
write_pnet(&set->net, net);
|
set->ops = ops;
|
set->ktype = ktype;
|
set->klen = desc.klen;
|
set->dtype = dtype;
|
set->objtype = objtype;
|
set->dlen = desc.dlen;
|
set->flags = flags;
|
set->size = desc.size;
|
set->policy = policy;
|
set->udlen = udlen;
|
set->udata = udata;
|
set->timeout = timeout;
|
set->gc_int = gc_int;
|
set->handle = nf_tables_alloc_handle(table);
|
|
err = ops->init(set, &desc, nla);
|
if (err < 0)
|
goto err3;
|
|
err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
|
if (err < 0)
|
goto err4;
|
|
list_add_tail_rcu(&set->list, &table->sets);
|
table->use++;
|
return 0;
|
|
err4:
|
ops->destroy(set);
|
err3:
|
kfree(set->name);
|
err2:
|
kvfree(set);
|
err1:
|
module_put(to_set_type(ops)->owner);
|
return err;
|
}
|
|
static void nft_set_destroy(struct nft_set *set)
|
{
|
if (WARN_ON(set->use > 0))
|
return;
|
|
set->ops->destroy(set);
|
module_put(to_set_type(set->ops)->owner);
|
kfree(set->name);
|
kvfree(set);
|
}
|
|
static int nf_tables_delset(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_next(net);
|
const struct nlattr *attr;
|
struct nft_set *set;
|
struct nft_ctx ctx;
|
int err;
|
|
if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
|
return -EAFNOSUPPORT;
|
if (nla[NFTA_SET_TABLE] == NULL)
|
return -EINVAL;
|
|
err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
|
genmask);
|
if (err < 0)
|
return err;
|
|
if (nla[NFTA_SET_HANDLE]) {
|
attr = nla[NFTA_SET_HANDLE];
|
set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
|
} else {
|
attr = nla[NFTA_SET_NAME];
|
set = nft_set_lookup(ctx.table, attr, genmask);
|
}
|
|
if (IS_ERR(set)) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return PTR_ERR(set);
|
}
|
if (set->use ||
|
(nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return -EBUSY;
|
}
|
|
return nft_delset(&ctx, set);
|
}
|
|
static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
|
struct nft_set *set,
|
const struct nft_set_iter *iter,
|
struct nft_set_elem *elem)
|
{
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
enum nft_registers dreg;
|
|
dreg = nft_type_to_reg(set->dtype);
|
return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
|
set->dtype == NFT_DATA_VERDICT ?
|
NFT_DATA_VERDICT : NFT_DATA_VALUE,
|
set->dlen);
|
}
|
|
int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
|
struct nft_set_binding *binding)
|
{
|
struct nft_set_binding *i;
|
struct nft_set_iter iter;
|
|
if (set->use == UINT_MAX)
|
return -EOVERFLOW;
|
|
if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
|
return -EBUSY;
|
|
if (binding->flags & NFT_SET_MAP) {
|
/* If the set is already bound to the same chain all
|
* jumps are already validated for that chain.
|
*/
|
list_for_each_entry(i, &set->bindings, list) {
|
if (i->flags & NFT_SET_MAP &&
|
i->chain == binding->chain)
|
goto bind;
|
}
|
|
iter.genmask = nft_genmask_next(ctx->net);
|
iter.skip = 0;
|
iter.count = 0;
|
iter.err = 0;
|
iter.fn = nf_tables_bind_check_setelem;
|
|
set->ops->walk(ctx, set, &iter);
|
if (iter.err < 0)
|
return iter.err;
|
}
|
bind:
|
binding->chain = ctx->chain;
|
list_add_tail_rcu(&binding->list, &set->bindings);
|
nft_set_trans_bind(ctx, set);
|
set->use++;
|
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(nf_tables_bind_set);
|
|
void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
|
struct nft_set_binding *binding, bool event)
|
{
|
list_del_rcu(&binding->list);
|
|
if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
|
list_del_rcu(&set->list);
|
if (event)
|
nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
|
GFP_KERNEL);
|
}
|
}
|
EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
|
|
void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
|
struct nft_set_binding *binding,
|
enum nft_trans_phase phase)
|
{
|
switch (phase) {
|
case NFT_TRANS_PREPARE:
|
set->use--;
|
return;
|
case NFT_TRANS_ABORT:
|
case NFT_TRANS_RELEASE:
|
set->use--;
|
/* fall through */
|
default:
|
nf_tables_unbind_set(ctx, set, binding,
|
phase == NFT_TRANS_COMMIT);
|
}
|
}
|
EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
|
|
void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
|
{
|
if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
|
nft_set_destroy(set);
|
}
|
EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
|
|
const struct nft_set_ext_type nft_set_ext_types[] = {
|
[NFT_SET_EXT_KEY] = {
|
.align = __alignof__(u32),
|
},
|
[NFT_SET_EXT_DATA] = {
|
.align = __alignof__(u32),
|
},
|
[NFT_SET_EXT_EXPR] = {
|
.align = __alignof__(struct nft_expr),
|
},
|
[NFT_SET_EXT_OBJREF] = {
|
.len = sizeof(struct nft_object *),
|
.align = __alignof__(struct nft_object *),
|
},
|
[NFT_SET_EXT_FLAGS] = {
|
.len = sizeof(u8),
|
.align = __alignof__(u8),
|
},
|
[NFT_SET_EXT_TIMEOUT] = {
|
.len = sizeof(u64),
|
.align = __alignof__(u64),
|
},
|
[NFT_SET_EXT_EXPIRATION] = {
|
.len = sizeof(u64),
|
.align = __alignof__(u64),
|
},
|
[NFT_SET_EXT_USERDATA] = {
|
.len = sizeof(struct nft_userdata),
|
.align = __alignof__(struct nft_userdata),
|
},
|
};
|
EXPORT_SYMBOL_GPL(nft_set_ext_types);
|
|
/*
|
* Set elements
|
*/
|
|
static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
|
[NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
|
[NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
|
[NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
|
[NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
|
[NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
|
.len = NFT_USERDATA_MAXLEN },
|
[NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
|
[NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
|
.len = NFT_OBJ_MAXNAMELEN - 1 },
|
};
|
|
static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
|
[NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
[NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
|
.len = NFT_SET_MAXNAMELEN - 1 },
|
[NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
|
[NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
|
};
|
|
static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
|
const struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack,
|
u8 genmask)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
int family = nfmsg->nfgen_family;
|
struct nft_table *table;
|
|
table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
|
genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
|
return 0;
|
}
|
|
static int nf_tables_fill_setelem(struct sk_buff *skb,
|
const struct nft_set *set,
|
const struct nft_set_elem *elem)
|
{
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
unsigned char *b = skb_tail_pointer(skb);
|
struct nlattr *nest;
|
|
nest = nla_nest_start(skb, NFTA_LIST_ELEM);
|
if (nest == NULL)
|
goto nla_put_failure;
|
|
if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
|
NFT_DATA_VALUE, set->klen) < 0)
|
goto nla_put_failure;
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
|
nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
|
set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
|
set->dlen) < 0)
|
goto nla_put_failure;
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
|
nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
|
goto nla_put_failure;
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
|
nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
|
(*nft_set_ext_obj(ext))->name) < 0)
|
goto nla_put_failure;
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
|
nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
|
htonl(*nft_set_ext_flags(ext))))
|
goto nla_put_failure;
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
|
nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
|
nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
|
NFTA_SET_ELEM_PAD))
|
goto nla_put_failure;
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
|
u64 expires, now = get_jiffies_64();
|
|
expires = *nft_set_ext_expiration(ext);
|
if (time_before64(now, expires))
|
expires -= now;
|
else
|
expires = 0;
|
|
if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
|
nf_jiffies64_to_msecs(expires),
|
NFTA_SET_ELEM_PAD))
|
goto nla_put_failure;
|
}
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
|
struct nft_userdata *udata;
|
|
udata = nft_set_ext_userdata(ext);
|
if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
|
udata->len + 1, udata->data))
|
goto nla_put_failure;
|
}
|
|
nla_nest_end(skb, nest);
|
return 0;
|
|
nla_put_failure:
|
nlmsg_trim(skb, b);
|
return -EMSGSIZE;
|
}
|
|
struct nft_set_dump_args {
|
const struct netlink_callback *cb;
|
struct nft_set_iter iter;
|
struct sk_buff *skb;
|
};
|
|
static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
|
struct nft_set *set,
|
const struct nft_set_iter *iter,
|
struct nft_set_elem *elem)
|
{
|
struct nft_set_dump_args *args;
|
|
args = container_of(iter, struct nft_set_dump_args, iter);
|
return nf_tables_fill_setelem(args->skb, set, elem);
|
}
|
|
struct nft_set_dump_ctx {
|
const struct nft_set *set;
|
struct nft_ctx ctx;
|
};
|
|
static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
|
{
|
struct nft_set_dump_ctx *dump_ctx = cb->data;
|
struct net *net = sock_net(skb->sk);
|
struct nft_table *table;
|
struct nft_set *set;
|
struct nft_set_dump_args args;
|
bool set_found = false;
|
struct nfgenmsg *nfmsg;
|
struct nlmsghdr *nlh;
|
struct nlattr *nest;
|
u32 portid, seq;
|
int event;
|
|
rcu_read_lock();
|
list_for_each_entry_rcu(table, &net->nft.tables, list) {
|
if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
|
dump_ctx->ctx.family != table->family)
|
continue;
|
|
if (table != dump_ctx->ctx.table)
|
continue;
|
|
list_for_each_entry_rcu(set, &table->sets, list) {
|
if (set == dump_ctx->set) {
|
set_found = true;
|
break;
|
}
|
}
|
break;
|
}
|
|
if (!set_found) {
|
rcu_read_unlock();
|
return -ENOENT;
|
}
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
|
portid = NETLINK_CB(cb->skb).portid;
|
seq = cb->nlh->nlmsg_seq;
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
|
NLM_F_MULTI);
|
if (nlh == NULL)
|
goto nla_put_failure;
|
|
nfmsg = nlmsg_data(nlh);
|
nfmsg->nfgen_family = table->family;
|
nfmsg->version = NFNETLINK_V0;
|
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
|
goto nla_put_failure;
|
if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
|
goto nla_put_failure;
|
|
nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
|
if (nest == NULL)
|
goto nla_put_failure;
|
|
args.cb = cb;
|
args.skb = skb;
|
args.iter.genmask = nft_genmask_cur(net);
|
args.iter.skip = cb->args[0];
|
args.iter.count = 0;
|
args.iter.err = 0;
|
args.iter.fn = nf_tables_dump_setelem;
|
set->ops->walk(&dump_ctx->ctx, set, &args.iter);
|
rcu_read_unlock();
|
|
nla_nest_end(skb, nest);
|
nlmsg_end(skb, nlh);
|
|
if (args.iter.err && args.iter.err != -EMSGSIZE)
|
return args.iter.err;
|
if (args.iter.count == cb->args[0])
|
return 0;
|
|
cb->args[0] = args.iter.count;
|
return skb->len;
|
|
nla_put_failure:
|
rcu_read_unlock();
|
return -ENOSPC;
|
}
|
|
static int nf_tables_dump_set_start(struct netlink_callback *cb)
|
{
|
struct nft_set_dump_ctx *dump_ctx = cb->data;
|
|
cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
|
|
return cb->data ? 0 : -ENOMEM;
|
}
|
|
static int nf_tables_dump_set_done(struct netlink_callback *cb)
|
{
|
kfree(cb->data);
|
return 0;
|
}
|
|
static int nf_tables_fill_setelem_info(struct sk_buff *skb,
|
const struct nft_ctx *ctx, u32 seq,
|
u32 portid, int event, u16 flags,
|
const struct nft_set *set,
|
const struct nft_set_elem *elem)
|
{
|
struct nfgenmsg *nfmsg;
|
struct nlmsghdr *nlh;
|
struct nlattr *nest;
|
int err;
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
|
flags);
|
if (nlh == NULL)
|
goto nla_put_failure;
|
|
nfmsg = nlmsg_data(nlh);
|
nfmsg->nfgen_family = ctx->family;
|
nfmsg->version = NFNETLINK_V0;
|
nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
|
|
if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
|
goto nla_put_failure;
|
if (nla_put_string(skb, NFTA_SET_NAME, set->name))
|
goto nla_put_failure;
|
|
nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
|
if (nest == NULL)
|
goto nla_put_failure;
|
|
err = nf_tables_fill_setelem(skb, set, elem);
|
if (err < 0)
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
nlmsg_end(skb, nlh);
|
return 0;
|
|
nla_put_failure:
|
nlmsg_trim(skb, nlh);
|
return -1;
|
}
|
|
static int nft_setelem_parse_flags(const struct nft_set *set,
|
const struct nlattr *attr, u32 *flags)
|
{
|
if (attr == NULL)
|
return 0;
|
|
*flags = ntohl(nla_get_be32(attr));
|
if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
|
return -EINVAL;
|
if (!(set->flags & NFT_SET_INTERVAL) &&
|
*flags & NFT_SET_ELEM_INTERVAL_END)
|
return -EINVAL;
|
|
return 0;
|
}
|
|
static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
|
const struct nlattr *attr)
|
{
|
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
|
struct nft_data_desc desc;
|
struct nft_set_elem elem;
|
struct sk_buff *skb;
|
uint32_t flags = 0;
|
void *priv;
|
int err;
|
|
err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
|
nft_set_elem_policy, NULL);
|
if (err < 0)
|
return err;
|
|
if (!nla[NFTA_SET_ELEM_KEY])
|
return -EINVAL;
|
|
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
|
if (err < 0)
|
return err;
|
|
err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
|
nla[NFTA_SET_ELEM_KEY]);
|
if (err < 0)
|
return err;
|
|
err = -EINVAL;
|
if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
|
nft_data_release(&elem.key.val, desc.type);
|
return err;
|
}
|
|
priv = set->ops->get(ctx->net, set, &elem, flags);
|
if (IS_ERR(priv))
|
return PTR_ERR(priv);
|
|
elem.priv = priv;
|
|
err = -ENOMEM;
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
|
if (skb == NULL)
|
return err;
|
|
err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
|
NFT_MSG_NEWSETELEM, 0, set, &elem);
|
if (err < 0)
|
goto err_fill_setelem;
|
|
return nfnetlink_unicast(skb, ctx->net, ctx->portid);
|
|
err_fill_setelem:
|
kfree_skb(skb);
|
return err;
|
}
|
|
/* called with rcu_read_lock held */
|
static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
u8 genmask = nft_genmask_cur(net);
|
struct nft_set *set;
|
struct nlattr *attr;
|
struct nft_ctx ctx;
|
int rem, err = 0;
|
|
err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
|
genmask);
|
if (err < 0)
|
return err;
|
|
set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
|
if (IS_ERR(set))
|
return PTR_ERR(set);
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
struct netlink_dump_control c = {
|
.start = nf_tables_dump_set_start,
|
.dump = nf_tables_dump_set,
|
.done = nf_tables_dump_set_done,
|
.module = THIS_MODULE,
|
};
|
struct nft_set_dump_ctx dump_ctx = {
|
.set = set,
|
.ctx = ctx,
|
};
|
|
c.data = &dump_ctx;
|
return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
|
}
|
|
if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
|
return -EINVAL;
|
|
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
|
err = nft_get_set_elem(&ctx, set, attr);
|
if (err < 0)
|
break;
|
}
|
|
return err;
|
}
|
|
static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
|
const struct nft_set *set,
|
const struct nft_set_elem *elem,
|
int event, u16 flags)
|
{
|
struct net *net = ctx->net;
|
u32 portid = ctx->portid;
|
struct sk_buff *skb;
|
int err;
|
|
if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
|
return;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
if (skb == NULL)
|
goto err;
|
|
err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
|
set, elem);
|
if (err < 0) {
|
kfree_skb(skb);
|
goto err;
|
}
|
|
nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
|
GFP_KERNEL);
|
return;
|
err:
|
nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
}
|
|
static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
|
int msg_type,
|
struct nft_set *set)
|
{
|
struct nft_trans *trans;
|
|
trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
|
if (trans == NULL)
|
return NULL;
|
|
nft_trans_elem_set(trans) = set;
|
return trans;
|
}
|
|
void *nft_set_elem_init(const struct nft_set *set,
|
const struct nft_set_ext_tmpl *tmpl,
|
const u32 *key, const u32 *data,
|
u64 timeout, gfp_t gfp)
|
{
|
struct nft_set_ext *ext;
|
void *elem;
|
|
elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
|
if (elem == NULL)
|
return NULL;
|
|
ext = nft_set_elem_ext(set, elem);
|
nft_set_ext_init(ext, tmpl);
|
|
memcpy(nft_set_ext_key(ext), key, set->klen);
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
|
memcpy(nft_set_ext_data(ext), data, set->dlen);
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
|
*nft_set_ext_expiration(ext) =
|
get_jiffies_64() + timeout;
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
|
*nft_set_ext_timeout(ext) = timeout;
|
|
return elem;
|
}
|
|
void nft_set_elem_destroy(const struct nft_set *set, void *elem,
|
bool destroy_expr)
|
{
|
struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
|
struct nft_ctx ctx = {
|
.net = read_pnet(&set->net),
|
.family = set->table->family,
|
};
|
|
nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
|
nft_data_release(nft_set_ext_data(ext), set->dtype);
|
if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
|
struct nft_expr *expr = nft_set_ext_expr(ext);
|
|
if (expr->ops->destroy_clone) {
|
expr->ops->destroy_clone(&ctx, expr);
|
module_put(expr->ops->type->owner);
|
} else {
|
nf_tables_expr_destroy(&ctx, expr);
|
}
|
}
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
|
(*nft_set_ext_obj(ext))->use--;
|
kfree(elem);
|
}
|
EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
|
|
/* Only called from commit path, nft_set_elem_deactivate() already deals with
|
* the refcounting from the preparation phase.
|
*/
|
static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
|
const struct nft_set *set, void *elem)
|
{
|
struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
|
nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
|
kfree(elem);
|
}
|
|
static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
|
const struct nlattr *attr, u32 nlmsg_flags)
|
{
|
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
|
u8 genmask = nft_genmask_next(ctx->net);
|
struct nft_data_desc d1, d2;
|
struct nft_set_ext_tmpl tmpl;
|
struct nft_set_ext *ext, *ext2;
|
struct nft_set_elem elem;
|
struct nft_set_binding *binding;
|
struct nft_object *obj = NULL;
|
struct nft_userdata *udata;
|
struct nft_data data;
|
enum nft_registers dreg;
|
struct nft_trans *trans;
|
u32 flags = 0;
|
u64 timeout;
|
u8 ulen;
|
int err;
|
|
err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
|
nft_set_elem_policy, NULL);
|
if (err < 0)
|
return err;
|
|
if (nla[NFTA_SET_ELEM_KEY] == NULL)
|
return -EINVAL;
|
|
nft_set_ext_prepare(&tmpl);
|
|
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
|
if (err < 0)
|
return err;
|
if (flags != 0)
|
nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
|
|
if (set->flags & NFT_SET_MAP) {
|
if (nla[NFTA_SET_ELEM_DATA] == NULL &&
|
!(flags & NFT_SET_ELEM_INTERVAL_END))
|
return -EINVAL;
|
} else {
|
if (nla[NFTA_SET_ELEM_DATA] != NULL)
|
return -EINVAL;
|
}
|
|
if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
|
(nla[NFTA_SET_ELEM_DATA] ||
|
nla[NFTA_SET_ELEM_OBJREF] ||
|
nla[NFTA_SET_ELEM_TIMEOUT] ||
|
nla[NFTA_SET_ELEM_EXPIRATION] ||
|
nla[NFTA_SET_ELEM_USERDATA] ||
|
nla[NFTA_SET_ELEM_EXPR]))
|
return -EINVAL;
|
|
timeout = 0;
|
if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
|
if (!(set->flags & NFT_SET_TIMEOUT))
|
return -EINVAL;
|
err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
|
&timeout);
|
if (err)
|
return err;
|
} else if (set->flags & NFT_SET_TIMEOUT) {
|
timeout = set->timeout;
|
}
|
|
err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
|
nla[NFTA_SET_ELEM_KEY]);
|
if (err < 0)
|
goto err1;
|
err = -EINVAL;
|
if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
|
goto err2;
|
|
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
|
if (timeout > 0) {
|
nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
|
if (timeout != set->timeout)
|
nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
|
}
|
|
if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
|
if (!(set->flags & NFT_SET_OBJECT)) {
|
err = -EINVAL;
|
goto err2;
|
}
|
obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
|
set->objtype, genmask);
|
if (IS_ERR(obj)) {
|
err = PTR_ERR(obj);
|
goto err2;
|
}
|
nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
|
}
|
|
if (nla[NFTA_SET_ELEM_DATA] != NULL) {
|
err = nft_data_init(ctx, &data, sizeof(data), &d2,
|
nla[NFTA_SET_ELEM_DATA]);
|
if (err < 0)
|
goto err2;
|
|
err = -EINVAL;
|
if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
|
goto err3;
|
|
dreg = nft_type_to_reg(set->dtype);
|
list_for_each_entry(binding, &set->bindings, list) {
|
struct nft_ctx bind_ctx = {
|
.net = ctx->net,
|
.family = ctx->family,
|
.table = ctx->table,
|
.chain = (struct nft_chain *)binding->chain,
|
};
|
|
if (!(binding->flags & NFT_SET_MAP))
|
continue;
|
|
err = nft_validate_register_store(&bind_ctx, dreg,
|
&data,
|
d2.type, d2.len);
|
if (err < 0)
|
goto err3;
|
|
if (d2.type == NFT_DATA_VERDICT &&
|
(data.verdict.code == NFT_GOTO ||
|
data.verdict.code == NFT_JUMP))
|
nft_validate_state_update(ctx->net,
|
NFT_VALIDATE_NEED);
|
}
|
|
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
|
}
|
|
/* The full maximum length of userdata can exceed the maximum
|
* offset value (U8_MAX) for following extensions, therefor it
|
* must be the last extension added.
|
*/
|
ulen = 0;
|
if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
|
ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
|
if (ulen > 0)
|
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
|
ulen);
|
}
|
|
err = -ENOMEM;
|
elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
|
timeout, GFP_KERNEL);
|
if (elem.priv == NULL)
|
goto err3;
|
|
ext = nft_set_elem_ext(set, elem.priv);
|
if (flags)
|
*nft_set_ext_flags(ext) = flags;
|
if (ulen > 0) {
|
udata = nft_set_ext_userdata(ext);
|
udata->len = ulen - 1;
|
nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
|
}
|
if (obj) {
|
*nft_set_ext_obj(ext) = obj;
|
obj->use++;
|
}
|
|
trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
|
if (trans == NULL)
|
goto err4;
|
|
ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
|
err = set->ops->insert(ctx->net, set, &elem, &ext2);
|
if (err) {
|
if (err == -EEXIST) {
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
|
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
|
nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
|
nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
|
err = -EBUSY;
|
goto err5;
|
}
|
if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
|
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
|
memcmp(nft_set_ext_data(ext),
|
nft_set_ext_data(ext2), set->dlen) != 0) ||
|
(nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
|
nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
|
*nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
|
err = -EBUSY;
|
else if (!(nlmsg_flags & NLM_F_EXCL))
|
err = 0;
|
}
|
goto err5;
|
}
|
|
if (set->size &&
|
!atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
|
err = -ENFILE;
|
goto err6;
|
}
|
|
nft_trans_elem(trans) = elem;
|
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
|
return 0;
|
|
err6:
|
set->ops->remove(ctx->net, set, &elem);
|
err5:
|
kfree(trans);
|
err4:
|
if (obj)
|
obj->use--;
|
kfree(elem.priv);
|
err3:
|
if (nla[NFTA_SET_ELEM_DATA] != NULL)
|
nft_data_release(&data, d2.type);
|
err2:
|
nft_data_release(&elem.key.val, d1.type);
|
err1:
|
return err;
|
}
|
|
static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
u8 genmask = nft_genmask_next(net);
|
const struct nlattr *attr;
|
struct nft_set *set;
|
struct nft_ctx ctx;
|
int rem, err;
|
|
if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
|
return -EINVAL;
|
|
err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
|
genmask);
|
if (err < 0)
|
return err;
|
|
set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
|
nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
|
if (IS_ERR(set))
|
return PTR_ERR(set);
|
|
if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
|
return -EBUSY;
|
|
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
|
err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
|
if (err < 0)
|
return err;
|
}
|
|
if (net->nft.validate_state == NFT_VALIDATE_DO)
|
return nft_table_validate(net, ctx.table);
|
|
return 0;
|
}
|
|
/**
|
* nft_data_hold - hold a nft_data item
|
*
|
* @data: struct nft_data to release
|
* @type: type of data
|
*
|
* Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
|
* NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
|
* NFT_GOTO verdicts. This function must be called on active data objects
|
* from the second phase of the commit protocol.
|
*/
|
void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
|
{
|
if (type == NFT_DATA_VERDICT) {
|
switch (data->verdict.code) {
|
case NFT_JUMP:
|
case NFT_GOTO:
|
data->verdict.chain->use++;
|
break;
|
}
|
}
|
}
|
|
static void nft_set_elem_activate(const struct net *net,
|
const struct nft_set *set,
|
struct nft_set_elem *elem)
|
{
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
|
nft_data_hold(nft_set_ext_data(ext), set->dtype);
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
|
(*nft_set_ext_obj(ext))->use++;
|
}
|
|
static void nft_set_elem_deactivate(const struct net *net,
|
const struct nft_set *set,
|
struct nft_set_elem *elem)
|
{
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
|
nft_data_release(nft_set_ext_data(ext), set->dtype);
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
|
(*nft_set_ext_obj(ext))->use--;
|
}
|
|
static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
|
const struct nlattr *attr)
|
{
|
struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
|
struct nft_set_ext_tmpl tmpl;
|
struct nft_data_desc desc;
|
struct nft_set_elem elem;
|
struct nft_set_ext *ext;
|
struct nft_trans *trans;
|
u32 flags = 0;
|
void *priv;
|
int err;
|
|
err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
|
nft_set_elem_policy, NULL);
|
if (err < 0)
|
goto err1;
|
|
err = -EINVAL;
|
if (nla[NFTA_SET_ELEM_KEY] == NULL)
|
goto err1;
|
|
nft_set_ext_prepare(&tmpl);
|
|
err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
|
if (err < 0)
|
return err;
|
if (flags != 0)
|
nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
|
|
err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
|
nla[NFTA_SET_ELEM_KEY]);
|
if (err < 0)
|
goto err1;
|
|
err = -EINVAL;
|
if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
|
goto err2;
|
|
nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
|
|
err = -ENOMEM;
|
elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
|
GFP_KERNEL);
|
if (elem.priv == NULL)
|
goto err2;
|
|
ext = nft_set_elem_ext(set, elem.priv);
|
if (flags)
|
*nft_set_ext_flags(ext) = flags;
|
|
trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
|
if (trans == NULL) {
|
err = -ENOMEM;
|
goto err3;
|
}
|
|
priv = set->ops->deactivate(ctx->net, set, &elem);
|
if (priv == NULL) {
|
err = -ENOENT;
|
goto err4;
|
}
|
kfree(elem.priv);
|
elem.priv = priv;
|
|
nft_set_elem_deactivate(ctx->net, set, &elem);
|
|
nft_trans_elem(trans) = elem;
|
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
|
return 0;
|
|
err4:
|
kfree(trans);
|
err3:
|
kfree(elem.priv);
|
err2:
|
nft_data_release(&elem.key.val, desc.type);
|
err1:
|
return err;
|
}
|
|
static int nft_flush_set(const struct nft_ctx *ctx,
|
struct nft_set *set,
|
const struct nft_set_iter *iter,
|
struct nft_set_elem *elem)
|
{
|
struct nft_trans *trans;
|
int err;
|
|
trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
|
sizeof(struct nft_trans_elem), GFP_ATOMIC);
|
if (!trans)
|
return -ENOMEM;
|
|
if (!set->ops->flush(ctx->net, set, elem->priv)) {
|
err = -ENOENT;
|
goto err1;
|
}
|
set->ndeact++;
|
|
nft_set_elem_deactivate(ctx->net, set, elem);
|
nft_trans_elem_set(trans) = set;
|
nft_trans_elem(trans) = *elem;
|
list_add_tail(&trans->list, &ctx->net->nft.commit_list);
|
|
return 0;
|
err1:
|
kfree(trans);
|
return err;
|
}
|
|
static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
u8 genmask = nft_genmask_next(net);
|
const struct nlattr *attr;
|
struct nft_set *set;
|
struct nft_ctx ctx;
|
int rem, err = 0;
|
|
err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
|
genmask);
|
if (err < 0)
|
return err;
|
|
set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
|
if (IS_ERR(set))
|
return PTR_ERR(set);
|
if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
|
return -EBUSY;
|
|
if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
|
struct nft_set_iter iter = {
|
.genmask = genmask,
|
.fn = nft_flush_set,
|
};
|
set->ops->walk(&ctx, set, &iter);
|
|
return iter.err;
|
}
|
|
nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
|
err = nft_del_setelem(&ctx, set, attr);
|
if (err < 0)
|
break;
|
|
set->ndeact++;
|
}
|
return err;
|
}
|
|
void nft_set_gc_batch_release(struct rcu_head *rcu)
|
{
|
struct nft_set_gc_batch *gcb;
|
unsigned int i;
|
|
gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
|
for (i = 0; i < gcb->head.cnt; i++)
|
nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
|
kfree(gcb);
|
}
|
EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
|
|
struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
|
gfp_t gfp)
|
{
|
struct nft_set_gc_batch *gcb;
|
|
gcb = kzalloc(sizeof(*gcb), gfp);
|
if (gcb == NULL)
|
return gcb;
|
gcb->head.set = set;
|
return gcb;
|
}
|
EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
|
|
/*
|
* Stateful objects
|
*/
|
|
/**
|
* nft_register_obj- register nf_tables stateful object type
|
* @obj: object type
|
*
|
* Registers the object type for use with nf_tables. Returns zero on
|
* success or a negative errno code otherwise.
|
*/
|
int nft_register_obj(struct nft_object_type *obj_type)
|
{
|
if (obj_type->type == NFT_OBJECT_UNSPEC)
|
return -EINVAL;
|
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
list_add_rcu(&obj_type->list, &nf_tables_objects);
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(nft_register_obj);
|
|
/**
|
* nft_unregister_obj - unregister nf_tables object type
|
* @obj: object type
|
*
|
* Unregisters the object type for use with nf_tables.
|
*/
|
void nft_unregister_obj(struct nft_object_type *obj_type)
|
{
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
list_del_rcu(&obj_type->list);
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
}
|
EXPORT_SYMBOL_GPL(nft_unregister_obj);
|
|
struct nft_object *nft_obj_lookup(const struct nft_table *table,
|
const struct nlattr *nla, u32 objtype,
|
u8 genmask)
|
{
|
struct nft_object *obj;
|
|
list_for_each_entry_rcu(obj, &table->objects, list) {
|
if (!nla_strcmp(nla, obj->name) &&
|
objtype == obj->ops->type->type &&
|
nft_active_genmask(obj, genmask))
|
return obj;
|
}
|
return ERR_PTR(-ENOENT);
|
}
|
EXPORT_SYMBOL_GPL(nft_obj_lookup);
|
|
static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
|
const struct nlattr *nla,
|
u32 objtype, u8 genmask)
|
{
|
struct nft_object *obj;
|
|
list_for_each_entry(obj, &table->objects, list) {
|
if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
|
objtype == obj->ops->type->type &&
|
nft_active_genmask(obj, genmask))
|
return obj;
|
}
|
return ERR_PTR(-ENOENT);
|
}
|
|
static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
|
[NFTA_OBJ_TABLE] = { .type = NLA_STRING,
|
.len = NFT_TABLE_MAXNAMELEN - 1 },
|
[NFTA_OBJ_NAME] = { .type = NLA_STRING,
|
.len = NFT_OBJ_MAXNAMELEN - 1 },
|
[NFTA_OBJ_TYPE] = { .type = NLA_U32 },
|
[NFTA_OBJ_DATA] = { .type = NLA_NESTED },
|
[NFTA_OBJ_HANDLE] = { .type = NLA_U64},
|
};
|
|
static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
|
const struct nft_object_type *type,
|
const struct nlattr *attr)
|
{
|
struct nlattr **tb;
|
const struct nft_object_ops *ops;
|
struct nft_object *obj;
|
int err = -ENOMEM;
|
|
tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
|
if (!tb)
|
goto err1;
|
|
if (attr) {
|
err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
|
NULL);
|
if (err < 0)
|
goto err2;
|
} else {
|
memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
|
}
|
|
if (type->select_ops) {
|
ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
|
if (IS_ERR(ops)) {
|
err = PTR_ERR(ops);
|
goto err2;
|
}
|
} else {
|
ops = type->ops;
|
}
|
|
err = -ENOMEM;
|
obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
|
if (!obj)
|
goto err2;
|
|
err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
|
if (err < 0)
|
goto err3;
|
|
obj->ops = ops;
|
|
kfree(tb);
|
return obj;
|
err3:
|
kfree(obj);
|
err2:
|
kfree(tb);
|
err1:
|
return ERR_PTR(err);
|
}
|
|
static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
|
struct nft_object *obj, bool reset)
|
{
|
struct nlattr *nest;
|
|
nest = nla_nest_start(skb, attr);
|
if (!nest)
|
goto nla_put_failure;
|
if (obj->ops->dump(skb, obj, reset) < 0)
|
goto nla_put_failure;
|
nla_nest_end(skb, nest);
|
return 0;
|
|
nla_put_failure:
|
return -1;
|
}
|
|
static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
|
{
|
const struct nft_object_type *type;
|
|
list_for_each_entry(type, &nf_tables_objects, list) {
|
if (objtype == type->type)
|
return type;
|
}
|
return NULL;
|
}
|
|
static const struct nft_object_type *
|
nft_obj_type_get(struct net *net, u32 objtype)
|
{
|
const struct nft_object_type *type;
|
|
type = __nft_obj_type_get(objtype);
|
if (type != NULL && try_module_get(type->owner))
|
return type;
|
|
lockdep_nfnl_nft_mutex_not_held();
|
#ifdef CONFIG_MODULES
|
if (type == NULL) {
|
nft_request_module(net, "nft-obj-%u", objtype);
|
if (__nft_obj_type_get(objtype))
|
return ERR_PTR(-EAGAIN);
|
}
|
#endif
|
return ERR_PTR(-ENOENT);
|
}
|
|
static int nf_tables_newobj(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
const struct nft_object_type *type;
|
u8 genmask = nft_genmask_next(net);
|
int family = nfmsg->nfgen_family;
|
struct nft_table *table;
|
struct nft_object *obj;
|
struct nft_ctx ctx;
|
u32 objtype;
|
int err;
|
|
if (!nla[NFTA_OBJ_TYPE] ||
|
!nla[NFTA_OBJ_NAME] ||
|
!nla[NFTA_OBJ_DATA])
|
return -EINVAL;
|
|
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
|
if (IS_ERR(obj)) {
|
err = PTR_ERR(obj);
|
if (err != -ENOENT) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
|
return err;
|
}
|
} else {
|
if (nlh->nlmsg_flags & NLM_F_EXCL) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
|
return -EEXIST;
|
}
|
return 0;
|
}
|
|
nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
|
|
type = nft_obj_type_get(net, objtype);
|
if (IS_ERR(type))
|
return PTR_ERR(type);
|
|
obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
|
if (IS_ERR(obj)) {
|
err = PTR_ERR(obj);
|
goto err1;
|
}
|
obj->table = table;
|
obj->handle = nf_tables_alloc_handle(table);
|
|
obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
|
if (!obj->name) {
|
err = -ENOMEM;
|
goto err2;
|
}
|
|
err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
|
if (err < 0)
|
goto err3;
|
|
list_add_tail_rcu(&obj->list, &table->objects);
|
table->use++;
|
return 0;
|
err3:
|
kfree(obj->name);
|
err2:
|
if (obj->ops->destroy)
|
obj->ops->destroy(&ctx, obj);
|
kfree(obj);
|
err1:
|
module_put(type->owner);
|
return err;
|
}
|
|
static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
|
u32 portid, u32 seq, int event, u32 flags,
|
int family, const struct nft_table *table,
|
struct nft_object *obj, bool reset)
|
{
|
struct nfgenmsg *nfmsg;
|
struct nlmsghdr *nlh;
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
|
if (nlh == NULL)
|
goto nla_put_failure;
|
|
nfmsg = nlmsg_data(nlh);
|
nfmsg->nfgen_family = family;
|
nfmsg->version = NFNETLINK_V0;
|
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
|
nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
|
nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
|
nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
|
nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
|
nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
|
NFTA_OBJ_PAD))
|
goto nla_put_failure;
|
|
nlmsg_end(skb, nlh);
|
return 0;
|
|
nla_put_failure:
|
nlmsg_trim(skb, nlh);
|
return -1;
|
}
|
|
struct nft_obj_filter {
|
char *table;
|
u32 type;
|
};
|
|
static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
const struct nft_table *table;
|
unsigned int idx = 0, s_idx = cb->args[0];
|
struct nft_obj_filter *filter = cb->data;
|
struct net *net = sock_net(skb->sk);
|
int family = nfmsg->nfgen_family;
|
struct nft_object *obj;
|
bool reset = false;
|
|
if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
|
reset = true;
|
|
rcu_read_lock();
|
cb->seq = net->nft.base_seq;
|
|
list_for_each_entry_rcu(table, &net->nft.tables, list) {
|
if (family != NFPROTO_UNSPEC && family != table->family)
|
continue;
|
|
list_for_each_entry_rcu(obj, &table->objects, list) {
|
if (!nft_is_active(net, obj))
|
goto cont;
|
if (idx < s_idx)
|
goto cont;
|
if (idx > s_idx)
|
memset(&cb->args[1], 0,
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
if (filter && filter->table &&
|
strcmp(filter->table, table->name))
|
goto cont;
|
if (filter &&
|
filter->type != NFT_OBJECT_UNSPEC &&
|
obj->ops->type->type != filter->type)
|
goto cont;
|
|
if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
|
cb->nlh->nlmsg_seq,
|
NFT_MSG_NEWOBJ,
|
NLM_F_MULTI | NLM_F_APPEND,
|
table->family, table,
|
obj, reset) < 0)
|
goto done;
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
cont:
|
idx++;
|
}
|
}
|
done:
|
rcu_read_unlock();
|
|
cb->args[0] = idx;
|
return skb->len;
|
}
|
|
static int nf_tables_dump_obj_start(struct netlink_callback *cb)
|
{
|
const struct nlattr * const *nla = cb->data;
|
struct nft_obj_filter *filter = NULL;
|
|
if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
|
filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
|
if (!filter)
|
return -ENOMEM;
|
|
if (nla[NFTA_OBJ_TABLE]) {
|
filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
|
if (!filter->table) {
|
kfree(filter);
|
return -ENOMEM;
|
}
|
}
|
|
if (nla[NFTA_OBJ_TYPE])
|
filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
}
|
|
cb->data = filter;
|
return 0;
|
}
|
|
static int nf_tables_dump_obj_done(struct netlink_callback *cb)
|
{
|
struct nft_obj_filter *filter = cb->data;
|
|
if (filter) {
|
kfree(filter->table);
|
kfree(filter);
|
}
|
|
return 0;
|
}
|
|
/* called with rcu_read_lock held */
|
static int nf_tables_getobj(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_cur(net);
|
int family = nfmsg->nfgen_family;
|
const struct nft_table *table;
|
struct nft_object *obj;
|
struct sk_buff *skb2;
|
bool reset = false;
|
u32 objtype;
|
int err;
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
struct netlink_dump_control c = {
|
.start = nf_tables_dump_obj_start,
|
.dump = nf_tables_dump_obj,
|
.done = nf_tables_dump_obj_done,
|
.module = THIS_MODULE,
|
.data = (void *)nla,
|
};
|
|
return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
|
}
|
|
if (!nla[NFTA_OBJ_NAME] ||
|
!nla[NFTA_OBJ_TYPE])
|
return -EINVAL;
|
|
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
|
if (IS_ERR(obj)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
|
return PTR_ERR(obj);
|
}
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
if (!skb2)
|
return -ENOMEM;
|
|
if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
|
reset = true;
|
|
err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
|
nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
|
family, table, obj, reset);
|
if (err < 0)
|
goto err_fill_obj_info;
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
err_fill_obj_info:
|
kfree_skb(skb2);
|
return err;
|
}
|
|
static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
|
{
|
if (obj->ops->destroy)
|
obj->ops->destroy(ctx, obj);
|
|
module_put(obj->ops->type->owner);
|
kfree(obj->name);
|
kfree(obj);
|
}
|
|
static int nf_tables_delobj(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_next(net);
|
int family = nfmsg->nfgen_family;
|
const struct nlattr *attr;
|
struct nft_table *table;
|
struct nft_object *obj;
|
struct nft_ctx ctx;
|
u32 objtype;
|
|
if (!nla[NFTA_OBJ_TYPE] ||
|
(!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
|
return -EINVAL;
|
|
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
|
if (nla[NFTA_OBJ_HANDLE]) {
|
attr = nla[NFTA_OBJ_HANDLE];
|
obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
|
} else {
|
attr = nla[NFTA_OBJ_NAME];
|
obj = nft_obj_lookup(table, attr, objtype, genmask);
|
}
|
|
if (IS_ERR(obj)) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return PTR_ERR(obj);
|
}
|
if (obj->use > 0) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return -EBUSY;
|
}
|
|
nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
|
|
return nft_delobj(&ctx, obj);
|
}
|
|
void nft_obj_notify(struct net *net, struct nft_table *table,
|
struct nft_object *obj, u32 portid, u32 seq, int event,
|
int family, int report, gfp_t gfp)
|
{
|
struct sk_buff *skb;
|
int err;
|
|
if (!report &&
|
!nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
|
return;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
|
if (skb == NULL)
|
goto err;
|
|
err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
|
table, obj, false);
|
if (err < 0) {
|
kfree_skb(skb);
|
goto err;
|
}
|
|
nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
|
return;
|
err:
|
nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
}
|
EXPORT_SYMBOL_GPL(nft_obj_notify);
|
|
static void nf_tables_obj_notify(const struct nft_ctx *ctx,
|
struct nft_object *obj, int event)
|
{
|
nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
|
ctx->family, ctx->report, GFP_KERNEL);
|
}
|
|
/*
|
* Flow tables
|
*/
|
void nft_register_flowtable_type(struct nf_flowtable_type *type)
|
{
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
list_add_tail_rcu(&type->list, &nf_tables_flowtables);
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
}
|
EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
|
|
void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
|
{
|
nfnl_lock(NFNL_SUBSYS_NFTABLES);
|
list_del_rcu(&type->list);
|
nfnl_unlock(NFNL_SUBSYS_NFTABLES);
|
}
|
EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
|
|
static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
|
[NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
|
.len = NFT_NAME_MAXLEN - 1 },
|
[NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
|
.len = NFT_NAME_MAXLEN - 1 },
|
[NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
|
[NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
|
};
|
|
struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
|
const struct nlattr *nla, u8 genmask)
|
{
|
struct nft_flowtable *flowtable;
|
|
list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
|
if (!nla_strcmp(nla, flowtable->name) &&
|
nft_active_genmask(flowtable, genmask))
|
return flowtable;
|
}
|
return ERR_PTR(-ENOENT);
|
}
|
EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
|
|
static struct nft_flowtable *
|
nft_flowtable_lookup_byhandle(const struct nft_table *table,
|
const struct nlattr *nla, u8 genmask)
|
{
|
struct nft_flowtable *flowtable;
|
|
list_for_each_entry(flowtable, &table->flowtables, list) {
|
if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
|
nft_active_genmask(flowtable, genmask))
|
return flowtable;
|
}
|
return ERR_PTR(-ENOENT);
|
}
|
|
static int nf_tables_parse_devices(const struct nft_ctx *ctx,
|
const struct nlattr *attr,
|
struct net_device *dev_array[], int *len)
|
{
|
const struct nlattr *tmp;
|
struct net_device *dev;
|
char ifname[IFNAMSIZ];
|
int rem, n = 0, err;
|
|
nla_for_each_nested(tmp, attr, rem) {
|
if (nla_type(tmp) != NFTA_DEVICE_NAME) {
|
err = -EINVAL;
|
goto err1;
|
}
|
|
nla_strlcpy(ifname, tmp, IFNAMSIZ);
|
dev = __dev_get_by_name(ctx->net, ifname);
|
if (!dev) {
|
err = -ENOENT;
|
goto err1;
|
}
|
|
dev_array[n++] = dev;
|
if (n == NFT_FLOWTABLE_DEVICE_MAX) {
|
err = -EFBIG;
|
goto err1;
|
}
|
}
|
if (!len)
|
return -EINVAL;
|
|
err = 0;
|
err1:
|
*len = n;
|
return err;
|
}
|
|
static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
|
[NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
|
[NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
|
[NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
|
};
|
|
static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
|
const struct nlattr *attr,
|
struct nft_flowtable *flowtable)
|
{
|
struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
|
struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
|
struct nf_hook_ops *ops;
|
int hooknum, priority;
|
int err, n = 0, i;
|
|
err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
|
nft_flowtable_hook_policy, NULL);
|
if (err < 0)
|
return err;
|
|
if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
|
!tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
|
!tb[NFTA_FLOWTABLE_HOOK_DEVS])
|
return -EINVAL;
|
|
hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
|
if (hooknum != NF_NETDEV_INGRESS)
|
return -EINVAL;
|
|
priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
|
|
err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
|
dev_array, &n);
|
if (err < 0)
|
return err;
|
|
ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
|
if (!ops)
|
return -ENOMEM;
|
|
flowtable->hooknum = hooknum;
|
flowtable->priority = priority;
|
flowtable->ops = ops;
|
flowtable->ops_len = n;
|
|
for (i = 0; i < n; i++) {
|
flowtable->ops[i].pf = NFPROTO_NETDEV;
|
flowtable->ops[i].hooknum = hooknum;
|
flowtable->ops[i].priority = priority;
|
flowtable->ops[i].priv = &flowtable->data;
|
flowtable->ops[i].hook = flowtable->data.type->hook;
|
flowtable->ops[i].dev = dev_array[i];
|
}
|
|
return err;
|
}
|
|
static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
|
{
|
const struct nf_flowtable_type *type;
|
|
list_for_each_entry(type, &nf_tables_flowtables, list) {
|
if (family == type->family)
|
return type;
|
}
|
return NULL;
|
}
|
|
static const struct nf_flowtable_type *
|
nft_flowtable_type_get(struct net *net, u8 family)
|
{
|
const struct nf_flowtable_type *type;
|
|
type = __nft_flowtable_type_get(family);
|
if (type != NULL && try_module_get(type->owner))
|
return type;
|
|
lockdep_nfnl_nft_mutex_not_held();
|
#ifdef CONFIG_MODULES
|
if (type == NULL) {
|
nft_request_module(net, "nf-flowtable-%u", family);
|
if (__nft_flowtable_type_get(family))
|
return ERR_PTR(-EAGAIN);
|
}
|
#endif
|
return ERR_PTR(-ENOENT);
|
}
|
|
static void nft_unregister_flowtable_net_hooks(struct net *net,
|
struct nft_flowtable *flowtable)
|
{
|
int i;
|
|
for (i = 0; i < flowtable->ops_len; i++) {
|
if (!flowtable->ops[i].dev)
|
continue;
|
|
nf_unregister_net_hook(net, &flowtable->ops[i]);
|
}
|
}
|
|
static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
const struct nf_flowtable_type *type;
|
struct nft_flowtable *flowtable, *ft;
|
u8 genmask = nft_genmask_next(net);
|
int family = nfmsg->nfgen_family;
|
struct nft_table *table;
|
struct nft_ctx ctx;
|
int err, i, k;
|
|
if (!nla[NFTA_FLOWTABLE_TABLE] ||
|
!nla[NFTA_FLOWTABLE_NAME] ||
|
!nla[NFTA_FLOWTABLE_HOOK])
|
return -EINVAL;
|
|
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
|
genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
|
genmask);
|
if (IS_ERR(flowtable)) {
|
err = PTR_ERR(flowtable);
|
if (err != -ENOENT) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
|
return err;
|
}
|
} else {
|
if (nlh->nlmsg_flags & NLM_F_EXCL) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
|
return -EEXIST;
|
}
|
|
return 0;
|
}
|
|
nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
|
|
flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
|
if (!flowtable)
|
return -ENOMEM;
|
|
flowtable->table = table;
|
flowtable->handle = nf_tables_alloc_handle(table);
|
|
flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
|
if (!flowtable->name) {
|
err = -ENOMEM;
|
goto err1;
|
}
|
|
type = nft_flowtable_type_get(net, family);
|
if (IS_ERR(type)) {
|
err = PTR_ERR(type);
|
goto err2;
|
}
|
|
flowtable->data.type = type;
|
err = type->init(&flowtable->data);
|
if (err < 0)
|
goto err3;
|
|
err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
|
flowtable);
|
if (err < 0)
|
goto err4;
|
|
for (i = 0; i < flowtable->ops_len; i++) {
|
if (!flowtable->ops[i].dev)
|
continue;
|
|
list_for_each_entry(ft, &table->flowtables, list) {
|
for (k = 0; k < ft->ops_len; k++) {
|
if (!ft->ops[k].dev)
|
continue;
|
|
if (flowtable->ops[i].dev == ft->ops[k].dev &&
|
flowtable->ops[i].pf == ft->ops[k].pf) {
|
err = -EBUSY;
|
goto err5;
|
}
|
}
|
}
|
|
err = nf_register_net_hook(net, &flowtable->ops[i]);
|
if (err < 0)
|
goto err5;
|
}
|
|
err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
|
if (err < 0)
|
goto err6;
|
|
list_add_tail_rcu(&flowtable->list, &table->flowtables);
|
table->use++;
|
|
return 0;
|
err6:
|
i = flowtable->ops_len;
|
err5:
|
for (k = i - 1; k >= 0; k--)
|
nf_unregister_net_hook(net, &flowtable->ops[k]);
|
|
kfree(flowtable->ops);
|
err4:
|
flowtable->data.type->free(&flowtable->data);
|
err3:
|
module_put(type->owner);
|
err2:
|
kfree(flowtable->name);
|
err1:
|
kfree(flowtable);
|
return err;
|
}
|
|
static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_next(net);
|
int family = nfmsg->nfgen_family;
|
struct nft_flowtable *flowtable;
|
const struct nlattr *attr;
|
struct nft_table *table;
|
struct nft_ctx ctx;
|
|
if (!nla[NFTA_FLOWTABLE_TABLE] ||
|
(!nla[NFTA_FLOWTABLE_NAME] &&
|
!nla[NFTA_FLOWTABLE_HANDLE]))
|
return -EINVAL;
|
|
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
|
genmask);
|
if (IS_ERR(table)) {
|
NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
|
return PTR_ERR(table);
|
}
|
|
if (nla[NFTA_FLOWTABLE_HANDLE]) {
|
attr = nla[NFTA_FLOWTABLE_HANDLE];
|
flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
|
} else {
|
attr = nla[NFTA_FLOWTABLE_NAME];
|
flowtable = nft_flowtable_lookup(table, attr, genmask);
|
}
|
|
if (IS_ERR(flowtable)) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return PTR_ERR(flowtable);
|
}
|
if (flowtable->use > 0) {
|
NL_SET_BAD_ATTR(extack, attr);
|
return -EBUSY;
|
}
|
|
nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
|
|
return nft_delflowtable(&ctx, flowtable);
|
}
|
|
static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
|
u32 portid, u32 seq, int event,
|
u32 flags, int family,
|
struct nft_flowtable *flowtable)
|
{
|
struct nlattr *nest, *nest_devs;
|
struct nfgenmsg *nfmsg;
|
struct nlmsghdr *nlh;
|
int i;
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
|
if (nlh == NULL)
|
goto nla_put_failure;
|
|
nfmsg = nlmsg_data(nlh);
|
nfmsg->nfgen_family = family;
|
nfmsg->version = NFNETLINK_V0;
|
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
|
nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
|
nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
|
nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
|
NFTA_FLOWTABLE_PAD))
|
goto nla_put_failure;
|
|
nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
|
if (!nest)
|
goto nla_put_failure;
|
if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
|
nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
|
goto nla_put_failure;
|
|
nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
|
if (!nest_devs)
|
goto nla_put_failure;
|
|
for (i = 0; i < flowtable->ops_len; i++) {
|
const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
|
|
if (dev &&
|
nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
|
goto nla_put_failure;
|
}
|
nla_nest_end(skb, nest_devs);
|
nla_nest_end(skb, nest);
|
|
nlmsg_end(skb, nlh);
|
return 0;
|
|
nla_put_failure:
|
nlmsg_trim(skb, nlh);
|
return -1;
|
}
|
|
struct nft_flowtable_filter {
|
char *table;
|
};
|
|
static int nf_tables_dump_flowtable(struct sk_buff *skb,
|
struct netlink_callback *cb)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
struct nft_flowtable_filter *filter = cb->data;
|
unsigned int idx = 0, s_idx = cb->args[0];
|
struct net *net = sock_net(skb->sk);
|
int family = nfmsg->nfgen_family;
|
struct nft_flowtable *flowtable;
|
const struct nft_table *table;
|
|
rcu_read_lock();
|
cb->seq = net->nft.base_seq;
|
|
list_for_each_entry_rcu(table, &net->nft.tables, list) {
|
if (family != NFPROTO_UNSPEC && family != table->family)
|
continue;
|
|
list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
|
if (!nft_is_active(net, flowtable))
|
goto cont;
|
if (idx < s_idx)
|
goto cont;
|
if (idx > s_idx)
|
memset(&cb->args[1], 0,
|
sizeof(cb->args) - sizeof(cb->args[0]));
|
if (filter && filter->table &&
|
strcmp(filter->table, table->name))
|
goto cont;
|
|
if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
|
cb->nlh->nlmsg_seq,
|
NFT_MSG_NEWFLOWTABLE,
|
NLM_F_MULTI | NLM_F_APPEND,
|
table->family, flowtable) < 0)
|
goto done;
|
|
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
|
cont:
|
idx++;
|
}
|
}
|
done:
|
rcu_read_unlock();
|
|
cb->args[0] = idx;
|
return skb->len;
|
}
|
|
static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
|
{
|
const struct nlattr * const *nla = cb->data;
|
struct nft_flowtable_filter *filter = NULL;
|
|
if (nla[NFTA_FLOWTABLE_TABLE]) {
|
filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
|
if (!filter)
|
return -ENOMEM;
|
|
filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
|
GFP_ATOMIC);
|
if (!filter->table) {
|
kfree(filter);
|
return -ENOMEM;
|
}
|
}
|
|
cb->data = filter;
|
return 0;
|
}
|
|
static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
|
{
|
struct nft_flowtable_filter *filter = cb->data;
|
|
if (!filter)
|
return 0;
|
|
kfree(filter->table);
|
kfree(filter);
|
|
return 0;
|
}
|
|
/* called with rcu_read_lock held */
|
static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb,
|
const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
u8 genmask = nft_genmask_cur(net);
|
int family = nfmsg->nfgen_family;
|
struct nft_flowtable *flowtable;
|
const struct nft_table *table;
|
struct sk_buff *skb2;
|
int err;
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
struct netlink_dump_control c = {
|
.start = nf_tables_dump_flowtable_start,
|
.dump = nf_tables_dump_flowtable,
|
.done = nf_tables_dump_flowtable_done,
|
.module = THIS_MODULE,
|
.data = (void *)nla,
|
};
|
|
return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
|
}
|
|
if (!nla[NFTA_FLOWTABLE_NAME])
|
return -EINVAL;
|
|
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
|
genmask);
|
if (IS_ERR(table))
|
return PTR_ERR(table);
|
|
flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
|
genmask);
|
if (IS_ERR(flowtable))
|
return PTR_ERR(flowtable);
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
if (!skb2)
|
return -ENOMEM;
|
|
err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
|
nlh->nlmsg_seq,
|
NFT_MSG_NEWFLOWTABLE, 0, family,
|
flowtable);
|
if (err < 0)
|
goto err_fill_flowtable_info;
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
err_fill_flowtable_info:
|
kfree_skb(skb2);
|
return err;
|
}
|
|
static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
|
struct nft_flowtable *flowtable,
|
int event)
|
{
|
struct sk_buff *skb;
|
int err;
|
|
if (ctx->report &&
|
!nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
|
return;
|
|
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
if (skb == NULL)
|
goto err;
|
|
err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
|
ctx->seq, event, 0,
|
ctx->family, flowtable);
|
if (err < 0) {
|
kfree_skb(skb);
|
goto err;
|
}
|
|
nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
|
ctx->report, GFP_KERNEL);
|
return;
|
err:
|
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
}
|
|
static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
|
{
|
kfree(flowtable->ops);
|
kfree(flowtable->name);
|
flowtable->data.type->free(&flowtable->data);
|
module_put(flowtable->data.type->owner);
|
kfree(flowtable);
|
}
|
|
static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
|
u32 portid, u32 seq)
|
{
|
struct nlmsghdr *nlh;
|
struct nfgenmsg *nfmsg;
|
char buf[TASK_COMM_LEN];
|
int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
|
if (nlh == NULL)
|
goto nla_put_failure;
|
|
nfmsg = nlmsg_data(nlh);
|
nfmsg->nfgen_family = AF_UNSPEC;
|
nfmsg->version = NFNETLINK_V0;
|
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
|
|
if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
|
nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
|
nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
|
goto nla_put_failure;
|
|
nlmsg_end(skb, nlh);
|
return 0;
|
|
nla_put_failure:
|
nlmsg_trim(skb, nlh);
|
return -EMSGSIZE;
|
}
|
|
static void nft_flowtable_event(unsigned long event, struct net_device *dev,
|
struct nft_flowtable *flowtable)
|
{
|
int i;
|
|
for (i = 0; i < flowtable->ops_len; i++) {
|
if (flowtable->ops[i].dev != dev)
|
continue;
|
|
nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
|
flowtable->ops[i].dev = NULL;
|
break;
|
}
|
}
|
|
static int nf_tables_flowtable_event(struct notifier_block *this,
|
unsigned long event, void *ptr)
|
{
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
struct nft_flowtable *flowtable;
|
struct nft_table *table;
|
struct net *net;
|
|
if (event != NETDEV_UNREGISTER)
|
return 0;
|
|
net = dev_net(dev);
|
mutex_lock(&net->nft.commit_mutex);
|
list_for_each_entry(table, &net->nft.tables, list) {
|
list_for_each_entry(flowtable, &table->flowtables, list) {
|
nft_flowtable_event(event, dev, flowtable);
|
}
|
}
|
mutex_unlock(&net->nft.commit_mutex);
|
|
return NOTIFY_DONE;
|
}
|
|
static struct notifier_block nf_tables_flowtable_notifier = {
|
.notifier_call = nf_tables_flowtable_event,
|
};
|
|
static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
|
int event)
|
{
|
struct nlmsghdr *nlh = nlmsg_hdr(skb);
|
struct sk_buff *skb2;
|
int err;
|
|
if (nlmsg_report(nlh) &&
|
!nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
|
return;
|
|
skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
if (skb2 == NULL)
|
goto err;
|
|
err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
|
nlh->nlmsg_seq);
|
if (err < 0) {
|
kfree_skb(skb2);
|
goto err;
|
}
|
|
nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
|
nlmsg_report(nlh), GFP_KERNEL);
|
return;
|
err:
|
nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
|
-ENOBUFS);
|
}
|
|
static int nf_tables_getgen(struct net *net, struct sock *nlsk,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const nla[],
|
struct netlink_ext_ack *extack)
|
{
|
struct sk_buff *skb2;
|
int err;
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
if (skb2 == NULL)
|
return -ENOMEM;
|
|
err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
|
nlh->nlmsg_seq);
|
if (err < 0)
|
goto err_fill_gen_info;
|
|
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
|
|
err_fill_gen_info:
|
kfree_skb(skb2);
|
return err;
|
}
|
|
static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
|
[NFT_MSG_NEWTABLE] = {
|
.call_batch = nf_tables_newtable,
|
.attr_count = NFTA_TABLE_MAX,
|
.policy = nft_table_policy,
|
},
|
[NFT_MSG_GETTABLE] = {
|
.call_rcu = nf_tables_gettable,
|
.attr_count = NFTA_TABLE_MAX,
|
.policy = nft_table_policy,
|
},
|
[NFT_MSG_DELTABLE] = {
|
.call_batch = nf_tables_deltable,
|
.attr_count = NFTA_TABLE_MAX,
|
.policy = nft_table_policy,
|
},
|
[NFT_MSG_NEWCHAIN] = {
|
.call_batch = nf_tables_newchain,
|
.attr_count = NFTA_CHAIN_MAX,
|
.policy = nft_chain_policy,
|
},
|
[NFT_MSG_GETCHAIN] = {
|
.call_rcu = nf_tables_getchain,
|
.attr_count = NFTA_CHAIN_MAX,
|
.policy = nft_chain_policy,
|
},
|
[NFT_MSG_DELCHAIN] = {
|
.call_batch = nf_tables_delchain,
|
.attr_count = NFTA_CHAIN_MAX,
|
.policy = nft_chain_policy,
|
},
|
[NFT_MSG_NEWRULE] = {
|
.call_batch = nf_tables_newrule,
|
.attr_count = NFTA_RULE_MAX,
|
.policy = nft_rule_policy,
|
},
|
[NFT_MSG_GETRULE] = {
|
.call_rcu = nf_tables_getrule,
|
.attr_count = NFTA_RULE_MAX,
|
.policy = nft_rule_policy,
|
},
|
[NFT_MSG_DELRULE] = {
|
.call_batch = nf_tables_delrule,
|
.attr_count = NFTA_RULE_MAX,
|
.policy = nft_rule_policy,
|
},
|
[NFT_MSG_NEWSET] = {
|
.call_batch = nf_tables_newset,
|
.attr_count = NFTA_SET_MAX,
|
.policy = nft_set_policy,
|
},
|
[NFT_MSG_GETSET] = {
|
.call_rcu = nf_tables_getset,
|
.attr_count = NFTA_SET_MAX,
|
.policy = nft_set_policy,
|
},
|
[NFT_MSG_DELSET] = {
|
.call_batch = nf_tables_delset,
|
.attr_count = NFTA_SET_MAX,
|
.policy = nft_set_policy,
|
},
|
[NFT_MSG_NEWSETELEM] = {
|
.call_batch = nf_tables_newsetelem,
|
.attr_count = NFTA_SET_ELEM_LIST_MAX,
|
.policy = nft_set_elem_list_policy,
|
},
|
[NFT_MSG_GETSETELEM] = {
|
.call_rcu = nf_tables_getsetelem,
|
.attr_count = NFTA_SET_ELEM_LIST_MAX,
|
.policy = nft_set_elem_list_policy,
|
},
|
[NFT_MSG_DELSETELEM] = {
|
.call_batch = nf_tables_delsetelem,
|
.attr_count = NFTA_SET_ELEM_LIST_MAX,
|
.policy = nft_set_elem_list_policy,
|
},
|
[NFT_MSG_GETGEN] = {
|
.call_rcu = nf_tables_getgen,
|
},
|
[NFT_MSG_NEWOBJ] = {
|
.call_batch = nf_tables_newobj,
|
.attr_count = NFTA_OBJ_MAX,
|
.policy = nft_obj_policy,
|
},
|
[NFT_MSG_GETOBJ] = {
|
.call_rcu = nf_tables_getobj,
|
.attr_count = NFTA_OBJ_MAX,
|
.policy = nft_obj_policy,
|
},
|
[NFT_MSG_DELOBJ] = {
|
.call_batch = nf_tables_delobj,
|
.attr_count = NFTA_OBJ_MAX,
|
.policy = nft_obj_policy,
|
},
|
[NFT_MSG_GETOBJ_RESET] = {
|
.call_rcu = nf_tables_getobj,
|
.attr_count = NFTA_OBJ_MAX,
|
.policy = nft_obj_policy,
|
},
|
[NFT_MSG_NEWFLOWTABLE] = {
|
.call_batch = nf_tables_newflowtable,
|
.attr_count = NFTA_FLOWTABLE_MAX,
|
.policy = nft_flowtable_policy,
|
},
|
[NFT_MSG_GETFLOWTABLE] = {
|
.call_rcu = nf_tables_getflowtable,
|
.attr_count = NFTA_FLOWTABLE_MAX,
|
.policy = nft_flowtable_policy,
|
},
|
[NFT_MSG_DELFLOWTABLE] = {
|
.call_batch = nf_tables_delflowtable,
|
.attr_count = NFTA_FLOWTABLE_MAX,
|
.policy = nft_flowtable_policy,
|
},
|
};
|
|
static int nf_tables_validate(struct net *net)
|
{
|
struct nft_table *table;
|
|
switch (net->nft.validate_state) {
|
case NFT_VALIDATE_SKIP:
|
break;
|
case NFT_VALIDATE_NEED:
|
nft_validate_state_update(net, NFT_VALIDATE_DO);
|
/* fall through */
|
case NFT_VALIDATE_DO:
|
list_for_each_entry(table, &net->nft.tables, list) {
|
if (nft_table_validate(net, table) < 0)
|
return -EAGAIN;
|
}
|
break;
|
}
|
|
return 0;
|
}
|
|
static void nft_chain_commit_update(struct nft_trans *trans)
|
{
|
struct nft_base_chain *basechain;
|
|
if (nft_trans_chain_name(trans)) {
|
rhltable_remove(&trans->ctx.table->chains_ht,
|
&trans->ctx.chain->rhlhead,
|
nft_chain_ht_params);
|
swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
|
rhltable_insert_key(&trans->ctx.table->chains_ht,
|
trans->ctx.chain->name,
|
&trans->ctx.chain->rhlhead,
|
nft_chain_ht_params);
|
}
|
|
if (!nft_is_base_chain(trans->ctx.chain))
|
return;
|
|
basechain = nft_base_chain(trans->ctx.chain);
|
nft_chain_stats_replace(trans->ctx.net, basechain,
|
nft_trans_chain_stats(trans));
|
|
switch (nft_trans_chain_policy(trans)) {
|
case NF_DROP:
|
case NF_ACCEPT:
|
basechain->policy = nft_trans_chain_policy(trans);
|
break;
|
}
|
}
|
|
static void nft_commit_release(struct nft_trans *trans)
|
{
|
switch (trans->msg_type) {
|
case NFT_MSG_DELTABLE:
|
nf_tables_table_destroy(&trans->ctx);
|
break;
|
case NFT_MSG_NEWCHAIN:
|
kfree(nft_trans_chain_name(trans));
|
break;
|
case NFT_MSG_DELCHAIN:
|
nf_tables_chain_destroy(&trans->ctx);
|
break;
|
case NFT_MSG_DELRULE:
|
nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
|
break;
|
case NFT_MSG_DELSET:
|
nft_set_destroy(nft_trans_set(trans));
|
break;
|
case NFT_MSG_DELSETELEM:
|
nf_tables_set_elem_destroy(&trans->ctx,
|
nft_trans_elem_set(trans),
|
nft_trans_elem(trans).priv);
|
break;
|
case NFT_MSG_DELOBJ:
|
nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
|
break;
|
case NFT_MSG_DELFLOWTABLE:
|
nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
|
break;
|
}
|
kfree(trans);
|
}
|
|
static void nf_tables_commit_release(struct net *net)
|
{
|
struct nft_trans *trans, *next;
|
|
if (list_empty(&net->nft.commit_list))
|
return;
|
|
synchronize_rcu();
|
|
list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
|
list_del(&trans->list);
|
nft_commit_release(trans);
|
}
|
}
|
|
static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
|
{
|
struct nft_rule *rule;
|
unsigned int alloc = 0;
|
int i;
|
|
/* already handled or inactive chain? */
|
if (chain->rules_next || !nft_is_active_next(net, chain))
|
return 0;
|
|
rule = list_entry(&chain->rules, struct nft_rule, list);
|
i = 0;
|
|
list_for_each_entry_continue(rule, &chain->rules, list) {
|
if (nft_is_active_next(net, rule))
|
alloc++;
|
}
|
|
chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
|
if (!chain->rules_next)
|
return -ENOMEM;
|
|
list_for_each_entry_continue(rule, &chain->rules, list) {
|
if (nft_is_active_next(net, rule))
|
chain->rules_next[i++] = rule;
|
}
|
|
chain->rules_next[i] = NULL;
|
return 0;
|
}
|
|
static void nf_tables_commit_chain_prepare_cancel(struct net *net)
|
{
|
struct nft_trans *trans, *next;
|
|
list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
|
struct nft_chain *chain = trans->ctx.chain;
|
|
if (trans->msg_type == NFT_MSG_NEWRULE ||
|
trans->msg_type == NFT_MSG_DELRULE) {
|
kvfree(chain->rules_next);
|
chain->rules_next = NULL;
|
}
|
}
|
}
|
|
static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
|
{
|
struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
|
|
kvfree(o->start);
|
}
|
|
static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
|
{
|
struct nft_rule **r = rules;
|
struct nft_rules_old *old;
|
|
while (*r)
|
r++;
|
|
r++; /* rcu_head is after end marker */
|
old = (void *) r;
|
old->start = rules;
|
|
call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
|
}
|
|
static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
|
{
|
struct nft_rule **g0, **g1;
|
bool next_genbit;
|
|
next_genbit = nft_gencursor_next(net);
|
|
g0 = rcu_dereference_protected(chain->rules_gen_0,
|
lockdep_commit_lock_is_held(net));
|
g1 = rcu_dereference_protected(chain->rules_gen_1,
|
lockdep_commit_lock_is_held(net));
|
|
/* No changes to this chain? */
|
if (chain->rules_next == NULL) {
|
/* chain had no change in last or next generation */
|
if (g0 == g1)
|
return;
|
/*
|
* chain had no change in this generation; make sure next
|
* one uses same rules as current generation.
|
*/
|
if (next_genbit) {
|
rcu_assign_pointer(chain->rules_gen_1, g0);
|
nf_tables_commit_chain_free_rules_old(g1);
|
} else {
|
rcu_assign_pointer(chain->rules_gen_0, g1);
|
nf_tables_commit_chain_free_rules_old(g0);
|
}
|
|
return;
|
}
|
|
if (next_genbit)
|
rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
|
else
|
rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
|
|
chain->rules_next = NULL;
|
|
if (g0 == g1)
|
return;
|
|
if (next_genbit)
|
nf_tables_commit_chain_free_rules_old(g1);
|
else
|
nf_tables_commit_chain_free_rules_old(g0);
|
}
|
|
static void nft_chain_del(struct nft_chain *chain)
|
{
|
struct nft_table *table = chain->table;
|
|
WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
|
nft_chain_ht_params));
|
list_del_rcu(&chain->list);
|
}
|
|
static int nf_tables_commit(struct net *net, struct sk_buff *skb)
|
{
|
struct nft_trans *trans, *next;
|
struct nft_trans_elem *te;
|
struct nft_chain *chain;
|
struct nft_table *table;
|
|
/* 0. Validate ruleset, otherwise roll back for error reporting. */
|
if (nf_tables_validate(net) < 0)
|
return -EAGAIN;
|
|
/* 1. Allocate space for next generation rules_gen_X[] */
|
list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
|
int ret;
|
|
if (trans->msg_type == NFT_MSG_NEWRULE ||
|
trans->msg_type == NFT_MSG_DELRULE) {
|
chain = trans->ctx.chain;
|
|
ret = nf_tables_commit_chain_prepare(net, chain);
|
if (ret < 0) {
|
nf_tables_commit_chain_prepare_cancel(net);
|
return ret;
|
}
|
}
|
}
|
|
/* step 2. Make rules_gen_X visible to packet path */
|
list_for_each_entry(table, &net->nft.tables, list) {
|
list_for_each_entry(chain, &table->chains, list)
|
nf_tables_commit_chain(net, chain);
|
}
|
|
/*
|
* Bump generation counter, invalidate any dump in progress.
|
* Cannot fail after this point.
|
*/
|
while (++net->nft.base_seq == 0);
|
|
/* step 3. Start new generation, rules_gen_X now in use. */
|
net->nft.gencursor = nft_gencursor_next(net);
|
|
list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
|
switch (trans->msg_type) {
|
case NFT_MSG_NEWTABLE:
|
if (nft_trans_table_update(trans)) {
|
if (!nft_trans_table_enable(trans)) {
|
nf_tables_table_disable(net,
|
trans->ctx.table);
|
trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
|
}
|
} else {
|
nft_clear(net, trans->ctx.table);
|
}
|
nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_DELTABLE:
|
list_del_rcu(&trans->ctx.table->list);
|
nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
|
break;
|
case NFT_MSG_NEWCHAIN:
|
if (nft_trans_chain_update(trans)) {
|
nft_chain_commit_update(trans);
|
nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
|
/* trans destroyed after rcu grace period */
|
} else {
|
nft_clear(net, trans->ctx.chain);
|
nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
|
nft_trans_destroy(trans);
|
}
|
break;
|
case NFT_MSG_DELCHAIN:
|
nft_chain_del(trans->ctx.chain);
|
nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
|
nf_tables_unregister_hook(trans->ctx.net,
|
trans->ctx.table,
|
trans->ctx.chain);
|
break;
|
case NFT_MSG_NEWRULE:
|
nft_clear(trans->ctx.net, nft_trans_rule(trans));
|
nf_tables_rule_notify(&trans->ctx,
|
nft_trans_rule(trans),
|
NFT_MSG_NEWRULE);
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_DELRULE:
|
list_del_rcu(&nft_trans_rule(trans)->list);
|
nf_tables_rule_notify(&trans->ctx,
|
nft_trans_rule(trans),
|
NFT_MSG_DELRULE);
|
nft_rule_expr_deactivate(&trans->ctx,
|
nft_trans_rule(trans),
|
NFT_TRANS_COMMIT);
|
break;
|
case NFT_MSG_NEWSET:
|
nft_clear(net, nft_trans_set(trans));
|
/* This avoids hitting -EBUSY when deleting the table
|
* from the transaction.
|
*/
|
if (nft_set_is_anonymous(nft_trans_set(trans)) &&
|
!list_empty(&nft_trans_set(trans)->bindings))
|
trans->ctx.table->use--;
|
|
nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
|
NFT_MSG_NEWSET, GFP_KERNEL);
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_DELSET:
|
list_del_rcu(&nft_trans_set(trans)->list);
|
nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
|
NFT_MSG_DELSET, GFP_KERNEL);
|
break;
|
case NFT_MSG_NEWSETELEM:
|
te = (struct nft_trans_elem *)trans->data;
|
|
te->set->ops->activate(net, te->set, &te->elem);
|
nf_tables_setelem_notify(&trans->ctx, te->set,
|
&te->elem,
|
NFT_MSG_NEWSETELEM, 0);
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_DELSETELEM:
|
te = (struct nft_trans_elem *)trans->data;
|
|
nf_tables_setelem_notify(&trans->ctx, te->set,
|
&te->elem,
|
NFT_MSG_DELSETELEM, 0);
|
te->set->ops->remove(net, te->set, &te->elem);
|
atomic_dec(&te->set->nelems);
|
te->set->ndeact--;
|
break;
|
case NFT_MSG_NEWOBJ:
|
nft_clear(net, nft_trans_obj(trans));
|
nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
|
NFT_MSG_NEWOBJ);
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_DELOBJ:
|
list_del_rcu(&nft_trans_obj(trans)->list);
|
nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
|
NFT_MSG_DELOBJ);
|
break;
|
case NFT_MSG_NEWFLOWTABLE:
|
nft_clear(net, nft_trans_flowtable(trans));
|
nf_tables_flowtable_notify(&trans->ctx,
|
nft_trans_flowtable(trans),
|
NFT_MSG_NEWFLOWTABLE);
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_DELFLOWTABLE:
|
list_del_rcu(&nft_trans_flowtable(trans)->list);
|
nf_tables_flowtable_notify(&trans->ctx,
|
nft_trans_flowtable(trans),
|
NFT_MSG_DELFLOWTABLE);
|
nft_unregister_flowtable_net_hooks(net,
|
nft_trans_flowtable(trans));
|
break;
|
}
|
}
|
|
nf_tables_commit_release(net);
|
nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
|
mutex_unlock(&net->nft.commit_mutex);
|
|
return 0;
|
}
|
|
static void nf_tables_abort_release(struct nft_trans *trans)
|
{
|
switch (trans->msg_type) {
|
case NFT_MSG_NEWTABLE:
|
nf_tables_table_destroy(&trans->ctx);
|
break;
|
case NFT_MSG_NEWCHAIN:
|
nf_tables_chain_destroy(&trans->ctx);
|
break;
|
case NFT_MSG_NEWRULE:
|
nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
|
break;
|
case NFT_MSG_NEWSET:
|
nft_set_destroy(nft_trans_set(trans));
|
break;
|
case NFT_MSG_NEWSETELEM:
|
nft_set_elem_destroy(nft_trans_elem_set(trans),
|
nft_trans_elem(trans).priv, true);
|
break;
|
case NFT_MSG_NEWOBJ:
|
nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
|
break;
|
case NFT_MSG_NEWFLOWTABLE:
|
nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
|
break;
|
}
|
kfree(trans);
|
}
|
|
static int __nf_tables_abort(struct net *net)
|
{
|
struct nft_trans *trans, *next;
|
struct nft_trans_elem *te;
|
|
list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
|
list) {
|
switch (trans->msg_type) {
|
case NFT_MSG_NEWTABLE:
|
if (nft_trans_table_update(trans)) {
|
if (nft_trans_table_enable(trans)) {
|
nf_tables_table_disable(net,
|
trans->ctx.table);
|
trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
|
}
|
nft_trans_destroy(trans);
|
} else {
|
list_del_rcu(&trans->ctx.table->list);
|
}
|
break;
|
case NFT_MSG_DELTABLE:
|
nft_clear(trans->ctx.net, trans->ctx.table);
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_NEWCHAIN:
|
if (nft_trans_chain_update(trans)) {
|
free_percpu(nft_trans_chain_stats(trans));
|
kfree(nft_trans_chain_name(trans));
|
nft_trans_destroy(trans);
|
} else {
|
trans->ctx.table->use--;
|
nft_chain_del(trans->ctx.chain);
|
nf_tables_unregister_hook(trans->ctx.net,
|
trans->ctx.table,
|
trans->ctx.chain);
|
}
|
break;
|
case NFT_MSG_DELCHAIN:
|
trans->ctx.table->use++;
|
nft_clear(trans->ctx.net, trans->ctx.chain);
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_NEWRULE:
|
trans->ctx.chain->use--;
|
list_del_rcu(&nft_trans_rule(trans)->list);
|
nft_rule_expr_deactivate(&trans->ctx,
|
nft_trans_rule(trans),
|
NFT_TRANS_ABORT);
|
break;
|
case NFT_MSG_DELRULE:
|
trans->ctx.chain->use++;
|
nft_clear(trans->ctx.net, nft_trans_rule(trans));
|
nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_NEWSET:
|
trans->ctx.table->use--;
|
if (nft_trans_set_bound(trans)) {
|
nft_trans_destroy(trans);
|
break;
|
}
|
list_del_rcu(&nft_trans_set(trans)->list);
|
break;
|
case NFT_MSG_DELSET:
|
trans->ctx.table->use++;
|
nft_clear(trans->ctx.net, nft_trans_set(trans));
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_NEWSETELEM:
|
if (nft_trans_elem_set_bound(trans)) {
|
nft_trans_destroy(trans);
|
break;
|
}
|
te = (struct nft_trans_elem *)trans->data;
|
te->set->ops->remove(net, te->set, &te->elem);
|
atomic_dec(&te->set->nelems);
|
break;
|
case NFT_MSG_DELSETELEM:
|
te = (struct nft_trans_elem *)trans->data;
|
|
nft_set_elem_activate(net, te->set, &te->elem);
|
te->set->ops->activate(net, te->set, &te->elem);
|
te->set->ndeact--;
|
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_NEWOBJ:
|
trans->ctx.table->use--;
|
list_del_rcu(&nft_trans_obj(trans)->list);
|
break;
|
case NFT_MSG_DELOBJ:
|
trans->ctx.table->use++;
|
nft_clear(trans->ctx.net, nft_trans_obj(trans));
|
nft_trans_destroy(trans);
|
break;
|
case NFT_MSG_NEWFLOWTABLE:
|
trans->ctx.table->use--;
|
list_del_rcu(&nft_trans_flowtable(trans)->list);
|
nft_unregister_flowtable_net_hooks(net,
|
nft_trans_flowtable(trans));
|
break;
|
case NFT_MSG_DELFLOWTABLE:
|
trans->ctx.table->use++;
|
nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
|
nft_trans_destroy(trans);
|
break;
|
}
|
}
|
|
synchronize_rcu();
|
|
list_for_each_entry_safe_reverse(trans, next,
|
&net->nft.commit_list, list) {
|
list_del(&trans->list);
|
nf_tables_abort_release(trans);
|
}
|
|
return 0;
|
}
|
|
static void nf_tables_cleanup(struct net *net)
|
{
|
nft_validate_state_update(net, NFT_VALIDATE_SKIP);
|
}
|
|
static int nf_tables_abort(struct net *net, struct sk_buff *skb)
|
{
|
int ret = __nf_tables_abort(net);
|
|
mutex_unlock(&net->nft.commit_mutex);
|
|
return ret;
|
}
|
|
static bool nf_tables_valid_genid(struct net *net, u32 genid)
|
{
|
bool genid_ok;
|
|
mutex_lock(&net->nft.commit_mutex);
|
|
genid_ok = genid == 0 || net->nft.base_seq == genid;
|
if (!genid_ok)
|
mutex_unlock(&net->nft.commit_mutex);
|
|
/* else, commit mutex has to be released by commit or abort function */
|
return genid_ok;
|
}
|
|
static const struct nfnetlink_subsystem nf_tables_subsys = {
|
.name = "nf_tables",
|
.subsys_id = NFNL_SUBSYS_NFTABLES,
|
.cb_count = NFT_MSG_MAX,
|
.cb = nf_tables_cb,
|
.commit = nf_tables_commit,
|
.abort = nf_tables_abort,
|
.cleanup = nf_tables_cleanup,
|
.valid_genid = nf_tables_valid_genid,
|
.owner = THIS_MODULE,
|
};
|
|
int nft_chain_validate_dependency(const struct nft_chain *chain,
|
enum nft_chain_types type)
|
{
|
const struct nft_base_chain *basechain;
|
|
if (nft_is_base_chain(chain)) {
|
basechain = nft_base_chain(chain);
|
if (basechain->type->type != type)
|
return -EOPNOTSUPP;
|
}
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
|
|
int nft_chain_validate_hooks(const struct nft_chain *chain,
|
unsigned int hook_flags)
|
{
|
struct nft_base_chain *basechain;
|
|
if (nft_is_base_chain(chain)) {
|
basechain = nft_base_chain(chain);
|
|
if ((1 << basechain->ops.hooknum) & hook_flags)
|
return 0;
|
|
return -EOPNOTSUPP;
|
}
|
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
|
|
/*
|
* Loop detection - walk through the ruleset beginning at the destination chain
|
* of a new jump until either the source chain is reached (loop) or all
|
* reachable chains have been traversed.
|
*
|
* The loop check is performed whenever a new jump verdict is added to an
|
* expression or verdict map or a verdict map is bound to a new chain.
|
*/
|
|
static int nf_tables_check_loops(const struct nft_ctx *ctx,
|
const struct nft_chain *chain);
|
|
static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
|
struct nft_set *set,
|
const struct nft_set_iter *iter,
|
struct nft_set_elem *elem)
|
{
|
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
|
const struct nft_data *data;
|
|
if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
|
*nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
|
return 0;
|
|
data = nft_set_ext_data(ext);
|
switch (data->verdict.code) {
|
case NFT_JUMP:
|
case NFT_GOTO:
|
return nf_tables_check_loops(ctx, data->verdict.chain);
|
default:
|
return 0;
|
}
|
}
|
|
static int nf_tables_check_loops(const struct nft_ctx *ctx,
|
const struct nft_chain *chain)
|
{
|
const struct nft_rule *rule;
|
const struct nft_expr *expr, *last;
|
struct nft_set *set;
|
struct nft_set_binding *binding;
|
struct nft_set_iter iter;
|
|
if (ctx->chain == chain)
|
return -ELOOP;
|
|
list_for_each_entry(rule, &chain->rules, list) {
|
nft_rule_for_each_expr(expr, last, rule) {
|
struct nft_immediate_expr *priv;
|
const struct nft_data *data;
|
int err;
|
|
if (strcmp(expr->ops->type->name, "immediate"))
|
continue;
|
|
priv = nft_expr_priv(expr);
|
if (priv->dreg != NFT_REG_VERDICT)
|
continue;
|
|
data = &priv->data;
|
switch (data->verdict.code) {
|
case NFT_JUMP:
|
case NFT_GOTO:
|
err = nf_tables_check_loops(ctx,
|
data->verdict.chain);
|
if (err < 0)
|
return err;
|
default:
|
break;
|
}
|
}
|
}
|
|
list_for_each_entry(set, &ctx->table->sets, list) {
|
if (!nft_is_active_next(ctx->net, set))
|
continue;
|
if (!(set->flags & NFT_SET_MAP) ||
|
set->dtype != NFT_DATA_VERDICT)
|
continue;
|
|
list_for_each_entry(binding, &set->bindings, list) {
|
if (!(binding->flags & NFT_SET_MAP) ||
|
binding->chain != chain)
|
continue;
|
|
iter.genmask = nft_genmask_next(ctx->net);
|
iter.skip = 0;
|
iter.count = 0;
|
iter.err = 0;
|
iter.fn = nf_tables_loop_check_setelem;
|
|
set->ops->walk(ctx, set, &iter);
|
if (iter.err < 0)
|
return iter.err;
|
}
|
}
|
|
return 0;
|
}
|
|
/**
|
* nft_parse_u32_check - fetch u32 attribute and check for maximum value
|
*
|
* @attr: netlink attribute to fetch value from
|
* @max: maximum value to be stored in dest
|
* @dest: pointer to the variable
|
*
|
* Parse, check and store a given u32 netlink attribute into variable.
|
* This function returns -ERANGE if the value goes over maximum value.
|
* Otherwise a 0 is returned and the attribute value is stored in the
|
* destination variable.
|
*/
|
int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
|
{
|
u32 val;
|
|
val = ntohl(nla_get_be32(attr));
|
if (val > max)
|
return -ERANGE;
|
|
*dest = val;
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(nft_parse_u32_check);
|
|
/**
|
* nft_parse_register - parse a register value from a netlink attribute
|
*
|
* @attr: netlink attribute
|
*
|
* Parse and translate a register value from a netlink attribute.
|
* Registers used to be 128 bit wide, these register numbers will be
|
* mapped to the corresponding 32 bit register numbers.
|
*/
|
unsigned int nft_parse_register(const struct nlattr *attr)
|
{
|
unsigned int reg;
|
|
reg = ntohl(nla_get_be32(attr));
|
switch (reg) {
|
case NFT_REG_VERDICT...NFT_REG_4:
|
return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
|
default:
|
return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
|
}
|
}
|
EXPORT_SYMBOL_GPL(nft_parse_register);
|
|
/**
|
* nft_dump_register - dump a register value to a netlink attribute
|
*
|
* @skb: socket buffer
|
* @attr: attribute number
|
* @reg: register number
|
*
|
* Construct a netlink attribute containing the register number. For
|
* compatibility reasons, register numbers being a multiple of 4 are
|
* translated to the corresponding 128 bit register numbers.
|
*/
|
int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
|
{
|
if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
|
reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
|
else
|
reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
|
|
return nla_put_be32(skb, attr, htonl(reg));
|
}
|
EXPORT_SYMBOL_GPL(nft_dump_register);
|
|
/**
|
* nft_validate_register_load - validate a load from a register
|
*
|
* @reg: the register number
|
* @len: the length of the data
|
*
|
* Validate that the input register is one of the general purpose
|
* registers and that the length of the load is within the bounds.
|
*/
|
int nft_validate_register_load(enum nft_registers reg, unsigned int len)
|
{
|
if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
|
return -EINVAL;
|
if (len == 0)
|
return -EINVAL;
|
if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
|
return -ERANGE;
|
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(nft_validate_register_load);
|
|
/**
|
* nft_validate_register_store - validate an expressions' register store
|
*
|
* @ctx: context of the expression performing the load
|
* @reg: the destination register number
|
* @data: the data to load
|
* @type: the data type
|
* @len: the length of the data
|
*
|
* Validate that a data load uses the appropriate data type for
|
* the destination register and the length is within the bounds.
|
* A value of NULL for the data means that its runtime gathered
|
* data.
|
*/
|
int nft_validate_register_store(const struct nft_ctx *ctx,
|
enum nft_registers reg,
|
const struct nft_data *data,
|
enum nft_data_types type, unsigned int len)
|
{
|
int err;
|
|
switch (reg) {
|
case NFT_REG_VERDICT:
|
if (type != NFT_DATA_VERDICT)
|
return -EINVAL;
|
|
if (data != NULL &&
|
(data->verdict.code == NFT_GOTO ||
|
data->verdict.code == NFT_JUMP)) {
|
err = nf_tables_check_loops(ctx, data->verdict.chain);
|
if (err < 0)
|
return err;
|
}
|
|
return 0;
|
default:
|
if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
|
return -EINVAL;
|
if (len == 0)
|
return -EINVAL;
|
if (reg * NFT_REG32_SIZE + len >
|
FIELD_SIZEOF(struct nft_regs, data))
|
return -ERANGE;
|
|
if (data != NULL && type != NFT_DATA_VALUE)
|
return -EINVAL;
|
return 0;
|
}
|
}
|
EXPORT_SYMBOL_GPL(nft_validate_register_store);
|
|
static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
|
[NFTA_VERDICT_CODE] = { .type = NLA_U32 },
|
[NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
|
.len = NFT_CHAIN_MAXNAMELEN - 1 },
|
};
|
|
static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
|
struct nft_data_desc *desc, const struct nlattr *nla)
|
{
|
u8 genmask = nft_genmask_next(ctx->net);
|
struct nlattr *tb[NFTA_VERDICT_MAX + 1];
|
struct nft_chain *chain;
|
int err;
|
|
err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
|
NULL);
|
if (err < 0)
|
return err;
|
|
if (!tb[NFTA_VERDICT_CODE])
|
return -EINVAL;
|
data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
|
|
switch (data->verdict.code) {
|
default:
|
switch (data->verdict.code & NF_VERDICT_MASK) {
|
case NF_ACCEPT:
|
case NF_DROP:
|
case NF_QUEUE:
|
break;
|
default:
|
return -EINVAL;
|
}
|
/* fall through */
|
case NFT_CONTINUE:
|
case NFT_BREAK:
|
case NFT_RETURN:
|
break;
|
case NFT_JUMP:
|
case NFT_GOTO:
|
if (!tb[NFTA_VERDICT_CHAIN])
|
return -EINVAL;
|
chain = nft_chain_lookup(ctx->net, ctx->table,
|
tb[NFTA_VERDICT_CHAIN], genmask);
|
if (IS_ERR(chain))
|
return PTR_ERR(chain);
|
if (nft_is_base_chain(chain))
|
return -EOPNOTSUPP;
|
|
chain->use++;
|
data->verdict.chain = chain;
|
break;
|
}
|
|
desc->len = sizeof(data->verdict);
|
desc->type = NFT_DATA_VERDICT;
|
return 0;
|
}
|
|
static void nft_verdict_uninit(const struct nft_data *data)
|
{
|
switch (data->verdict.code) {
|
case NFT_JUMP:
|
case NFT_GOTO:
|
data->verdict.chain->use--;
|
break;
|
}
|
}
|
|
int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
|
{
|
struct nlattr *nest;
|
|
nest = nla_nest_start(skb, type);
|
if (!nest)
|
goto nla_put_failure;
|
|
if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
|
goto nla_put_failure;
|
|
switch (v->code) {
|
case NFT_JUMP:
|
case NFT_GOTO:
|
if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
|
v->chain->name))
|
goto nla_put_failure;
|
}
|
nla_nest_end(skb, nest);
|
return 0;
|
|
nla_put_failure:
|
return -1;
|
}
|
|
static int nft_value_init(const struct nft_ctx *ctx,
|
struct nft_data *data, unsigned int size,
|
struct nft_data_desc *desc, const struct nlattr *nla)
|
{
|
unsigned int len;
|
|
len = nla_len(nla);
|
if (len == 0)
|
return -EINVAL;
|
if (len > size)
|
return -EOVERFLOW;
|
|
nla_memcpy(data->data, nla, len);
|
desc->type = NFT_DATA_VALUE;
|
desc->len = len;
|
return 0;
|
}
|
|
static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
|
unsigned int len)
|
{
|
return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
|
}
|
|
static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
|
[NFTA_DATA_VALUE] = { .type = NLA_BINARY },
|
[NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
|
};
|
|
/**
|
* nft_data_init - parse nf_tables data netlink attributes
|
*
|
* @ctx: context of the expression using the data
|
* @data: destination struct nft_data
|
* @size: maximum data length
|
* @desc: data description
|
* @nla: netlink attribute containing data
|
*
|
* Parse the netlink data attributes and initialize a struct nft_data.
|
* The type and length of data are returned in the data description.
|
*
|
* The caller can indicate that it only wants to accept data of type
|
* NFT_DATA_VALUE by passing NULL for the ctx argument.
|
*/
|
int nft_data_init(const struct nft_ctx *ctx,
|
struct nft_data *data, unsigned int size,
|
struct nft_data_desc *desc, const struct nlattr *nla)
|
{
|
struct nlattr *tb[NFTA_DATA_MAX + 1];
|
int err;
|
|
err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
|
if (err < 0)
|
return err;
|
|
if (tb[NFTA_DATA_VALUE])
|
return nft_value_init(ctx, data, size, desc,
|
tb[NFTA_DATA_VALUE]);
|
if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
|
return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
|
return -EINVAL;
|
}
|
EXPORT_SYMBOL_GPL(nft_data_init);
|
|
/**
|
* nft_data_release - release a nft_data item
|
*
|
* @data: struct nft_data to release
|
* @type: type of data
|
*
|
* Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
|
* all others need to be released by calling this function.
|
*/
|
void nft_data_release(const struct nft_data *data, enum nft_data_types type)
|
{
|
if (type < NFT_DATA_VERDICT)
|
return;
|
switch (type) {
|
case NFT_DATA_VERDICT:
|
return nft_verdict_uninit(data);
|
default:
|
WARN_ON(1);
|
}
|
}
|
EXPORT_SYMBOL_GPL(nft_data_release);
|
|
int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
|
enum nft_data_types type, unsigned int len)
|
{
|
struct nlattr *nest;
|
int err;
|
|
nest = nla_nest_start(skb, attr);
|
if (nest == NULL)
|
return -1;
|
|
switch (type) {
|
case NFT_DATA_VALUE:
|
err = nft_value_dump(skb, data, len);
|
break;
|
case NFT_DATA_VERDICT:
|
err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
|
break;
|
default:
|
err = -EINVAL;
|
WARN_ON(1);
|
}
|
|
nla_nest_end(skb, nest);
|
return err;
|
}
|
EXPORT_SYMBOL_GPL(nft_data_dump);
|
|
int __nft_release_basechain(struct nft_ctx *ctx)
|
{
|
struct nft_rule *rule, *nr;
|
|
if (WARN_ON(!nft_is_base_chain(ctx->chain)))
|
return 0;
|
|
nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
|
list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
|
list_del(&rule->list);
|
ctx->chain->use--;
|
nf_tables_rule_release(ctx, rule);
|
}
|
nft_chain_del(ctx->chain);
|
ctx->table->use--;
|
nf_tables_chain_destroy(ctx);
|
|
return 0;
|
}
|
EXPORT_SYMBOL_GPL(__nft_release_basechain);
|
|
static void __nft_release_tables(struct net *net)
|
{
|
struct nft_flowtable *flowtable, *nf;
|
struct nft_table *table, *nt;
|
struct nft_chain *chain, *nc;
|
struct nft_object *obj, *ne;
|
struct nft_rule *rule, *nr;
|
struct nft_set *set, *ns;
|
struct nft_ctx ctx = {
|
.net = net,
|
.family = NFPROTO_NETDEV,
|
};
|
|
list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
|
ctx.family = table->family;
|
|
list_for_each_entry(chain, &table->chains, list)
|
nf_tables_unregister_hook(net, table, chain);
|
/* No packets are walking on these chains anymore. */
|
ctx.table = table;
|
list_for_each_entry(chain, &table->chains, list) {
|
ctx.chain = chain;
|
list_for_each_entry_safe(rule, nr, &chain->rules, list) {
|
list_del(&rule->list);
|
chain->use--;
|
nf_tables_rule_release(&ctx, rule);
|
}
|
}
|
list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
|
list_del(&flowtable->list);
|
table->use--;
|
nf_tables_flowtable_destroy(flowtable);
|
}
|
list_for_each_entry_safe(set, ns, &table->sets, list) {
|
list_del(&set->list);
|
table->use--;
|
nft_set_destroy(set);
|
}
|
list_for_each_entry_safe(obj, ne, &table->objects, list) {
|
list_del(&obj->list);
|
table->use--;
|
nft_obj_destroy(&ctx, obj);
|
}
|
list_for_each_entry_safe(chain, nc, &table->chains, list) {
|
ctx.chain = chain;
|
nft_chain_del(chain);
|
table->use--;
|
nf_tables_chain_destroy(&ctx);
|
}
|
list_del(&table->list);
|
nf_tables_table_destroy(&ctx);
|
}
|
}
|
|
static int __net_init nf_tables_init_net(struct net *net)
|
{
|
INIT_LIST_HEAD(&net->nft.tables);
|
INIT_LIST_HEAD(&net->nft.commit_list);
|
mutex_init(&net->nft.commit_mutex);
|
net->nft.base_seq = 1;
|
net->nft.validate_state = NFT_VALIDATE_SKIP;
|
|
return 0;
|
}
|
|
static void __net_exit nf_tables_exit_net(struct net *net)
|
{
|
mutex_lock(&net->nft.commit_mutex);
|
if (!list_empty(&net->nft.commit_list))
|
__nf_tables_abort(net);
|
__nft_release_tables(net);
|
mutex_unlock(&net->nft.commit_mutex);
|
WARN_ON_ONCE(!list_empty(&net->nft.tables));
|
}
|
|
static struct pernet_operations nf_tables_net_ops = {
|
.init = nf_tables_init_net,
|
.exit = nf_tables_exit_net,
|
};
|
|
static int __init nf_tables_module_init(void)
|
{
|
int err;
|
|
err = register_pernet_subsys(&nf_tables_net_ops);
|
if (err < 0)
|
return err;
|
|
err = nft_chain_filter_init();
|
if (err < 0)
|
goto err1;
|
|
err = nf_tables_core_module_init();
|
if (err < 0)
|
goto err2;
|
|
err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
|
if (err < 0)
|
goto err3;
|
|
/* must be last */
|
err = nfnetlink_subsys_register(&nf_tables_subsys);
|
if (err < 0)
|
goto err4;
|
|
return err;
|
err4:
|
unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
|
err3:
|
nf_tables_core_module_exit();
|
err2:
|
nft_chain_filter_fini();
|
err1:
|
unregister_pernet_subsys(&nf_tables_net_ops);
|
return err;
|
}
|
|
static void __exit nf_tables_module_exit(void)
|
{
|
nfnetlink_subsys_unregister(&nf_tables_subsys);
|
unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
|
nft_chain_filter_fini();
|
unregister_pernet_subsys(&nf_tables_net_ops);
|
rcu_barrier();
|
nf_tables_core_module_exit();
|
}
|
|
module_init(nf_tables_module_init);
|
module_exit(nf_tables_module_exit);
|
|
MODULE_LICENSE("GPL");
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
|
