1 // SPDX-License-Identifier: GPL-2.0-only
4 * Generic part shared by ipv4 and ipv6 backends.
7 #include <linux/kernel.h>
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/netlink.h>
11 #include <linux/netfilter.h>
12 #include <linux/netfilter/nf_tables.h>
13 #include <net/netfilter/nf_tables_core.h>
14 #include <net/netfilter/nf_tables.h>
15 #include <net/netfilter/nft_fib.h>
17 #define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \
18 NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF | \
21 const struct nla_policy nft_fib_policy[NFTA_FIB_MAX + 1] = {
22 [NFTA_FIB_DREG] = { .type = NLA_U32 },
23 [NFTA_FIB_RESULT] = { .type = NLA_U32 },
25 NLA_POLICY_MASK(NLA_BE32, NFTA_FIB_F_ALL),
27 EXPORT_SYMBOL(nft_fib_policy);
29 int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
30 const struct nft_data **data)
32 const struct nft_fib *priv = nft_expr_priv(expr);
35 switch (priv->result) {
36 case NFT_FIB_RESULT_OIF:
37 case NFT_FIB_RESULT_OIFNAME:
38 hooks = (1 << NF_INET_PRE_ROUTING);
39 if (priv->flags & NFTA_FIB_F_IIF) {
40 hooks |= (1 << NF_INET_LOCAL_IN) |
41 (1 << NF_INET_FORWARD);
44 case NFT_FIB_RESULT_ADDRTYPE:
45 if (priv->flags & NFTA_FIB_F_IIF)
46 hooks = (1 << NF_INET_PRE_ROUTING) |
47 (1 << NF_INET_LOCAL_IN) |
48 (1 << NF_INET_FORWARD);
49 else if (priv->flags & NFTA_FIB_F_OIF)
50 hooks = (1 << NF_INET_LOCAL_OUT) |
51 (1 << NF_INET_POST_ROUTING) |
52 (1 << NF_INET_FORWARD);
54 hooks = (1 << NF_INET_LOCAL_IN) |
55 (1 << NF_INET_LOCAL_OUT) |
56 (1 << NF_INET_FORWARD) |
57 (1 << NF_INET_PRE_ROUTING) |
58 (1 << NF_INET_POST_ROUTING);
65 return nft_chain_validate_hooks(ctx->chain, hooks);
67 EXPORT_SYMBOL_GPL(nft_fib_validate);
69 int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
70 const struct nlattr * const tb[])
72 struct nft_fib *priv = nft_expr_priv(expr);
76 if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS])
79 priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS]));
84 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) ==
85 (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR))
87 if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) ==
88 (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF))
90 if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0)
93 priv->result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
95 switch (priv->result) {
96 case NFT_FIB_RESULT_OIF:
97 if (priv->flags & NFTA_FIB_F_OIF)
101 case NFT_FIB_RESULT_OIFNAME:
102 if (priv->flags & NFTA_FIB_F_OIF)
106 case NFT_FIB_RESULT_ADDRTYPE:
113 err = nft_parse_register_store(ctx, tb[NFTA_FIB_DREG], &priv->dreg,
114 NULL, NFT_DATA_VALUE, len);
120 EXPORT_SYMBOL_GPL(nft_fib_init);
122 int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr, bool reset)
124 const struct nft_fib *priv = nft_expr_priv(expr);
126 if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg))
129 if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result)))
132 if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags)))
137 EXPORT_SYMBOL_GPL(nft_fib_dump);
139 void nft_fib_store_result(void *reg, const struct nft_fib *priv,
140 const struct net_device *dev)
145 switch (priv->result) {
146 case NFT_FIB_RESULT_OIF:
147 index = dev ? dev->ifindex : 0;
148 if (priv->flags & NFTA_FIB_F_PRESENT)
149 nft_reg_store8(dreg, !!index);
154 case NFT_FIB_RESULT_OIFNAME:
155 if (priv->flags & NFTA_FIB_F_PRESENT)
156 nft_reg_store8(dreg, !!dev);
158 strscpy_pad(reg, dev ? dev->name : "", IFNAMSIZ);
166 EXPORT_SYMBOL_GPL(nft_fib_store_result);
168 bool nft_fib_reduce(struct nft_regs_track *track,
169 const struct nft_expr *expr)
171 const struct nft_fib *priv = nft_expr_priv(expr);
172 unsigned int len = NFT_REG32_SIZE;
173 const struct nft_fib *fib;
175 switch (priv->result) {
176 case NFT_FIB_RESULT_OIF:
178 case NFT_FIB_RESULT_OIFNAME:
179 if (priv->flags & NFTA_FIB_F_PRESENT)
180 len = NFT_REG32_SIZE;
184 case NFT_FIB_RESULT_ADDRTYPE:
191 if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
192 nft_reg_track_update(track, expr, priv->dreg, len);
196 fib = nft_expr_priv(track->regs[priv->dreg].selector);
197 if (priv->result != fib->result ||
198 priv->flags != fib->flags) {
199 nft_reg_track_update(track, expr, priv->dreg, len);
203 if (!track->regs[priv->dreg].bitwise)
208 EXPORT_SYMBOL_GPL(nft_fib_reduce);
210 MODULE_LICENSE("GPL");
211 MODULE_DESCRIPTION("Query routing table from nftables");
212 MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");