/*
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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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* Generic part shared by ipv4 and ipv6 backends.
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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/nft_fib.h>
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const struct nla_policy nft_fib_policy[NFTA_FIB_MAX + 1] = {
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[NFTA_FIB_DREG] = { .type = NLA_U32 },
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[NFTA_FIB_RESULT] = { .type = NLA_U32 },
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[NFTA_FIB_FLAGS] = { .type = NLA_U32 },
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};
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EXPORT_SYMBOL(nft_fib_policy);
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#define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \
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NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF | \
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NFTA_FIB_F_PRESENT)
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int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
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const struct nft_data **data)
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{
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const struct nft_fib *priv = nft_expr_priv(expr);
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unsigned int hooks;
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switch (priv->result) {
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case NFT_FIB_RESULT_OIF: /* fallthrough */
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case NFT_FIB_RESULT_OIFNAME:
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hooks = (1 << NF_INET_PRE_ROUTING);
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break;
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case NFT_FIB_RESULT_ADDRTYPE:
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if (priv->flags & NFTA_FIB_F_IIF)
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hooks = (1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_LOCAL_IN) |
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(1 << NF_INET_FORWARD);
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else if (priv->flags & NFTA_FIB_F_OIF)
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hooks = (1 << NF_INET_LOCAL_OUT) |
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(1 << NF_INET_POST_ROUTING) |
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(1 << NF_INET_FORWARD);
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else
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hooks = (1 << NF_INET_LOCAL_IN) |
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(1 << NF_INET_LOCAL_OUT) |
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(1 << NF_INET_FORWARD) |
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(1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_POST_ROUTING);
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break;
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default:
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return -EINVAL;
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}
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return nft_chain_validate_hooks(ctx->chain, hooks);
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}
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EXPORT_SYMBOL_GPL(nft_fib_validate);
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int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_fib *priv = nft_expr_priv(expr);
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unsigned int len;
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int err;
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if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS])
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return -EINVAL;
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priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS]));
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if (priv->flags == 0 || (priv->flags & ~NFTA_FIB_F_ALL))
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return -EINVAL;
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if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) ==
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(NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR))
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return -EINVAL;
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if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) ==
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(NFTA_FIB_F_IIF | NFTA_FIB_F_OIF))
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return -EINVAL;
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if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0)
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return -EINVAL;
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priv->result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
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priv->dreg = nft_parse_register(tb[NFTA_FIB_DREG]);
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switch (priv->result) {
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case NFT_FIB_RESULT_OIF:
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if (priv->flags & NFTA_FIB_F_OIF)
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return -EINVAL;
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len = sizeof(int);
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break;
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case NFT_FIB_RESULT_OIFNAME:
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if (priv->flags & NFTA_FIB_F_OIF)
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return -EINVAL;
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len = IFNAMSIZ;
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break;
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case NFT_FIB_RESULT_ADDRTYPE:
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len = sizeof(u32);
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break;
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default:
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return -EINVAL;
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}
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err = nft_validate_register_store(ctx, priv->dreg, NULL,
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NFT_DATA_VALUE, len);
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if (err < 0)
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return err;
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return 0;
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}
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EXPORT_SYMBOL_GPL(nft_fib_init);
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int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_fib *priv = nft_expr_priv(expr);
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if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg))
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return -1;
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if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result)))
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return -1;
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if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags)))
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return -1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(nft_fib_dump);
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void nft_fib_store_result(void *reg, const struct nft_fib *priv,
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const struct nft_pktinfo *pkt, int index)
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{
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struct net_device *dev;
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u32 *dreg = reg;
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switch (priv->result) {
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case NFT_FIB_RESULT_OIF:
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*dreg = (priv->flags & NFTA_FIB_F_PRESENT) ? !!index : index;
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break;
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case NFT_FIB_RESULT_OIFNAME:
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dev = dev_get_by_index_rcu(nft_net(pkt), index);
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if (priv->flags & NFTA_FIB_F_PRESENT)
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*dreg = !!dev;
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else
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strncpy(reg, dev ? dev->name : "", IFNAMSIZ);
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break;
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default:
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WARN_ON_ONCE(1);
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*dreg = 0;
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break;
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}
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}
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EXPORT_SYMBOL_GPL(nft_fib_store_result);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
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