2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License version 2 as
4 * published by the Free Software Foundation.
6 * Generic part shared by ipv4 and ipv6 backends.
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/netlink.h>
13 #include <linux/netfilter.h>
14 #include <linux/netfilter/nf_tables.h>
15 #include <net/netfilter/nf_tables_core.h>
16 #include <net/netfilter/nf_tables.h>
17 #include <net/netfilter/nft_fib.h>
19 const struct nla_policy nft_fib_policy[NFTA_FIB_MAX + 1] = {
20 [NFTA_FIB_DREG] = { .type = NLA_U32 },
21 [NFTA_FIB_RESULT] = { .type = NLA_U32 },
22 [NFTA_FIB_FLAGS] = { .type = NLA_U32 },
24 EXPORT_SYMBOL(nft_fib_policy);
26 #define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \
27 NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF | \
30 int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
31 const struct nft_data **data)
33 const struct nft_fib *priv = nft_expr_priv(expr);
36 switch (priv->result) {
37 case NFT_FIB_RESULT_OIF: /* fallthrough */
38 case NFT_FIB_RESULT_OIFNAME:
39 hooks = (1 << NF_INET_PRE_ROUTING);
41 case NFT_FIB_RESULT_ADDRTYPE:
42 if (priv->flags & NFTA_FIB_F_IIF)
43 hooks = (1 << NF_INET_PRE_ROUTING) |
44 (1 << NF_INET_LOCAL_IN) |
45 (1 << NF_INET_FORWARD);
46 else if (priv->flags & NFTA_FIB_F_OIF)
47 hooks = (1 << NF_INET_LOCAL_OUT) |
48 (1 << NF_INET_POST_ROUTING) |
49 (1 << NF_INET_FORWARD);
51 hooks = (1 << NF_INET_LOCAL_IN) |
52 (1 << NF_INET_LOCAL_OUT) |
53 (1 << NF_INET_FORWARD) |
54 (1 << NF_INET_PRE_ROUTING) |
55 (1 << NF_INET_POST_ROUTING);
62 return nft_chain_validate_hooks(ctx->chain, hooks);
64 EXPORT_SYMBOL_GPL(nft_fib_validate);
66 int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
67 const struct nlattr * const tb[])
69 struct nft_fib *priv = nft_expr_priv(expr);
73 if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS])
76 priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS]));
78 if (priv->flags == 0 || (priv->flags & ~NFTA_FIB_F_ALL))
81 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) ==
82 (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR))
84 if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) ==
85 (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF))
87 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0)
90 priv->result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
92 switch (priv->result) {
93 case NFT_FIB_RESULT_OIF:
94 if (priv->flags & NFTA_FIB_F_OIF)
98 case NFT_FIB_RESULT_OIFNAME:
99 if (priv->flags & NFTA_FIB_F_OIF)
103 case NFT_FIB_RESULT_ADDRTYPE:
110 err = nft_parse_register_store(ctx, tb[NFTA_FIB_DREG], &priv->dreg,
111 NULL, NFT_DATA_VALUE, len);
117 EXPORT_SYMBOL_GPL(nft_fib_init);
119 int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr)
121 const struct nft_fib *priv = nft_expr_priv(expr);
123 if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg))
126 if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result)))
129 if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags)))
134 EXPORT_SYMBOL_GPL(nft_fib_dump);
136 void nft_fib_store_result(void *reg, const struct nft_fib *priv,
137 const struct nft_pktinfo *pkt, int index)
139 struct net_device *dev;
142 switch (priv->result) {
143 case NFT_FIB_RESULT_OIF:
144 *dreg = (priv->flags & NFTA_FIB_F_PRESENT) ? !!index : index;
146 case NFT_FIB_RESULT_OIFNAME:
147 dev = dev_get_by_index_rcu(nft_net(pkt), index);
148 if (priv->flags & NFTA_FIB_F_PRESENT)
151 strncpy(reg, dev ? dev->name : "", IFNAMSIZ);
159 EXPORT_SYMBOL_GPL(nft_fib_store_result);
161 MODULE_LICENSE("GPL");
162 MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");