// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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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/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.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/netfilter/nf_tables_offload.h>
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void nft_immediate_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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nft_data_copy(®s->data[priv->dreg], &priv->data, priv->dlen);
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}
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static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = {
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[NFTA_IMMEDIATE_DREG] = { .type = NLA_U32 },
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[NFTA_IMMEDIATE_DATA] = { .type = NLA_NESTED },
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};
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static enum nft_data_types nft_reg_to_type(const struct nlattr *nla)
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{
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enum nft_data_types type;
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u8 reg;
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reg = ntohl(nla_get_be32(nla));
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if (reg == NFT_REG_VERDICT)
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type = NFT_DATA_VERDICT;
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else
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type = NFT_DATA_VALUE;
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return type;
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}
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static int nft_immediate_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_immediate_expr *priv = nft_expr_priv(expr);
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struct nft_data_desc desc = {
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.size = sizeof(priv->data),
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};
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int err;
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if (tb[NFTA_IMMEDIATE_DREG] == NULL ||
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tb[NFTA_IMMEDIATE_DATA] == NULL)
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return -EINVAL;
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desc.type = nft_reg_to_type(tb[NFTA_IMMEDIATE_DREG]);
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err = nft_data_init(ctx, &priv->data, &desc, tb[NFTA_IMMEDIATE_DATA]);
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if (err < 0)
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return err;
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priv->dlen = desc.len;
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err = nft_parse_register_store(ctx, tb[NFTA_IMMEDIATE_DREG],
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&priv->dreg, &priv->data, desc.type,
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desc.len);
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if (err < 0)
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goto err1;
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if (priv->dreg == NFT_REG_VERDICT) {
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struct nft_chain *chain = priv->data.verdict.chain;
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switch (priv->data.verdict.code) {
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case NFT_JUMP:
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case NFT_GOTO:
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if (nft_chain_is_bound(chain)) {
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err = -EBUSY;
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goto err1;
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}
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chain->bound = true;
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break;
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default:
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break;
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}
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}
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return 0;
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err1:
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nft_data_release(&priv->data, desc.type);
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return err;
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}
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static void nft_immediate_activate(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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return nft_data_hold(&priv->data, nft_dreg_to_type(priv->dreg));
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}
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static void nft_immediate_deactivate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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enum nft_trans_phase phase)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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if (phase == NFT_TRANS_COMMIT)
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return;
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return nft_data_release(&priv->data, nft_dreg_to_type(priv->dreg));
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}
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static void nft_immediate_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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const struct nft_data *data = &priv->data;
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struct nft_rule *rule, *n;
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struct nft_ctx chain_ctx;
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struct nft_chain *chain;
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if (priv->dreg != NFT_REG_VERDICT)
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return;
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switch (data->verdict.code) {
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case NFT_JUMP:
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case NFT_GOTO:
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chain = data->verdict.chain;
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if (!nft_chain_is_bound(chain))
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break;
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chain_ctx = *ctx;
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chain_ctx.chain = chain;
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list_for_each_entry_safe(rule, n, &chain->rules, list)
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nf_tables_rule_release(&chain_ctx, rule);
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nf_tables_chain_destroy(&chain_ctx);
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break;
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default:
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break;
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}
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}
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static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg))
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goto nla_put_failure;
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return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data,
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nft_dreg_to_type(priv->dreg), priv->dlen);
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nla_put_failure:
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return -1;
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}
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static int nft_immediate_validate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nft_data **d)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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struct nft_ctx *pctx = (struct nft_ctx *)ctx;
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const struct nft_data *data;
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int err;
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if (priv->dreg != NFT_REG_VERDICT)
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return 0;
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data = &priv->data;
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switch (data->verdict.code) {
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case NFT_JUMP:
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case NFT_GOTO:
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pctx->level++;
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err = nft_chain_validate(ctx, data->verdict.chain);
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if (err < 0)
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return err;
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pctx->level--;
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break;
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default:
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break;
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}
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return 0;
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}
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static int nft_immediate_offload_verdict(struct nft_offload_ctx *ctx,
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struct nft_flow_rule *flow,
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const struct nft_immediate_expr *priv)
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{
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struct flow_action_entry *entry;
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const struct nft_data *data;
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entry = &flow->rule->action.entries[ctx->num_actions++];
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data = &priv->data;
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switch (data->verdict.code) {
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case NF_ACCEPT:
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entry->id = FLOW_ACTION_ACCEPT;
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break;
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case NF_DROP:
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entry->id = FLOW_ACTION_DROP;
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int nft_immediate_offload(struct nft_offload_ctx *ctx,
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struct nft_flow_rule *flow,
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const struct nft_expr *expr)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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if (priv->dreg == NFT_REG_VERDICT)
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return nft_immediate_offload_verdict(ctx, flow, priv);
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memcpy(&ctx->regs[priv->dreg].data, &priv->data, sizeof(priv->data));
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return 0;
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}
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static bool nft_immediate_offload_action(const struct nft_expr *expr)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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if (priv->dreg == NFT_REG_VERDICT)
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return true;
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return false;
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}
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static const struct nft_expr_ops nft_imm_ops = {
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.type = &nft_imm_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)),
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.eval = nft_immediate_eval,
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.init = nft_immediate_init,
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.activate = nft_immediate_activate,
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.deactivate = nft_immediate_deactivate,
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.destroy = nft_immediate_destroy,
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.dump = nft_immediate_dump,
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.validate = nft_immediate_validate,
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.offload = nft_immediate_offload,
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.offload_action = nft_immediate_offload_action,
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};
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struct nft_expr_type nft_imm_type __read_mostly = {
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.name = "immediate",
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.ops = &nft_imm_ops,
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.policy = nft_immediate_policy,
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.maxattr = NFTA_IMMEDIATE_MAX,
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.owner = THIS_MODULE,
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};
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