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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f6d0cbcf | 2 | /* |
f6d0cbcf FW |
3 | * |
4 | * Generic part shared by ipv4 and ipv6 backends. | |
5 | */ | |
6 | ||
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> | |
16 | ||
17 | const struct nla_policy nft_fib_policy[NFTA_FIB_MAX + 1] = { | |
18 | [NFTA_FIB_DREG] = { .type = NLA_U32 }, | |
19 | [NFTA_FIB_RESULT] = { .type = NLA_U32 }, | |
20 | [NFTA_FIB_FLAGS] = { .type = NLA_U32 }, | |
21 | }; | |
22 | EXPORT_SYMBOL(nft_fib_policy); | |
23 | ||
24 | #define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \ | |
055c4b34 PS |
25 | NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF | \ |
26 | NFTA_FIB_F_PRESENT) | |
f6d0cbcf FW |
27 | |
28 | int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
29 | const struct nft_data **data) | |
30 | { | |
31 | const struct nft_fib *priv = nft_expr_priv(expr); | |
32 | unsigned int hooks; | |
33 | ||
34 | switch (priv->result) { | |
35 | case NFT_FIB_RESULT_OIF: /* fallthrough */ | |
36 | case NFT_FIB_RESULT_OIFNAME: | |
37 | hooks = (1 << NF_INET_PRE_ROUTING); | |
38 | break; | |
39 | case NFT_FIB_RESULT_ADDRTYPE: | |
40 | if (priv->flags & NFTA_FIB_F_IIF) | |
41 | hooks = (1 << NF_INET_PRE_ROUTING) | | |
42 | (1 << NF_INET_LOCAL_IN) | | |
43 | (1 << NF_INET_FORWARD); | |
44 | else if (priv->flags & NFTA_FIB_F_OIF) | |
45 | hooks = (1 << NF_INET_LOCAL_OUT) | | |
46 | (1 << NF_INET_POST_ROUTING) | | |
47 | (1 << NF_INET_FORWARD); | |
48 | else | |
49 | hooks = (1 << NF_INET_LOCAL_IN) | | |
50 | (1 << NF_INET_LOCAL_OUT) | | |
51 | (1 << NF_INET_FORWARD) | | |
52 | (1 << NF_INET_PRE_ROUTING) | | |
53 | (1 << NF_INET_POST_ROUTING); | |
54 | ||
55 | break; | |
56 | default: | |
57 | return -EINVAL; | |
58 | } | |
59 | ||
60 | return nft_chain_validate_hooks(ctx->chain, hooks); | |
61 | } | |
62 | EXPORT_SYMBOL_GPL(nft_fib_validate); | |
63 | ||
64 | int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
65 | const struct nlattr * const tb[]) | |
66 | { | |
67 | struct nft_fib *priv = nft_expr_priv(expr); | |
68 | unsigned int len; | |
69 | int err; | |
70 | ||
71 | if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS]) | |
72 | return -EINVAL; | |
73 | ||
74 | priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS])); | |
75 | ||
76 | if (priv->flags == 0 || (priv->flags & ~NFTA_FIB_F_ALL)) | |
77 | return -EINVAL; | |
78 | ||
79 | if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == | |
80 | (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) | |
81 | return -EINVAL; | |
82 | if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) == | |
83 | (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) | |
84 | return -EINVAL; | |
85 | if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0) | |
86 | return -EINVAL; | |
87 | ||
11583438 | 88 | priv->result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT])); |
f6d0cbcf FW |
89 | priv->dreg = nft_parse_register(tb[NFTA_FIB_DREG]); |
90 | ||
91 | switch (priv->result) { | |
92 | case NFT_FIB_RESULT_OIF: | |
93 | if (priv->flags & NFTA_FIB_F_OIF) | |
94 | return -EINVAL; | |
95 | len = sizeof(int); | |
96 | break; | |
97 | case NFT_FIB_RESULT_OIFNAME: | |
98 | if (priv->flags & NFTA_FIB_F_OIF) | |
99 | return -EINVAL; | |
100 | len = IFNAMSIZ; | |
101 | break; | |
102 | case NFT_FIB_RESULT_ADDRTYPE: | |
103 | len = sizeof(u32); | |
104 | break; | |
105 | default: | |
106 | return -EINVAL; | |
107 | } | |
108 | ||
109 | err = nft_validate_register_store(ctx, priv->dreg, NULL, | |
110 | NFT_DATA_VALUE, len); | |
111 | if (err < 0) | |
112 | return err; | |
113 | ||
c56e3956 | 114 | return 0; |
f6d0cbcf FW |
115 | } |
116 | EXPORT_SYMBOL_GPL(nft_fib_init); | |
117 | ||
118 | int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
119 | { | |
120 | const struct nft_fib *priv = nft_expr_priv(expr); | |
121 | ||
122 | if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg)) | |
123 | return -1; | |
124 | ||
125 | if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result))) | |
126 | return -1; | |
127 | ||
128 | if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags))) | |
129 | return -1; | |
130 | ||
131 | return 0; | |
132 | } | |
133 | EXPORT_SYMBOL_GPL(nft_fib_dump); | |
134 | ||
055c4b34 | 135 | void nft_fib_store_result(void *reg, const struct nft_fib *priv, |
e633508a | 136 | const struct net_device *dev) |
f6d0cbcf | 137 | { |
f6d0cbcf | 138 | u32 *dreg = reg; |
e633508a | 139 | int index; |
f6d0cbcf | 140 | |
055c4b34 | 141 | switch (priv->result) { |
f6d0cbcf | 142 | case NFT_FIB_RESULT_OIF: |
e633508a | 143 | index = dev ? dev->ifindex : 0; |
055c4b34 | 144 | *dreg = (priv->flags & NFTA_FIB_F_PRESENT) ? !!index : index; |
f6d0cbcf FW |
145 | break; |
146 | case NFT_FIB_RESULT_OIFNAME: | |
055c4b34 PS |
147 | if (priv->flags & NFTA_FIB_F_PRESENT) |
148 | *dreg = !!dev; | |
149 | else | |
150 | strncpy(reg, dev ? dev->name : "", IFNAMSIZ); | |
f6d0cbcf FW |
151 | break; |
152 | default: | |
153 | WARN_ON_ONCE(1); | |
154 | *dreg = 0; | |
155 | break; | |
156 | } | |
157 | } | |
158 | EXPORT_SYMBOL_GPL(nft_fib_store_result); | |
159 | ||
160 | MODULE_LICENSE("GPL"); | |
161 | MODULE_AUTHOR("Florian Westphal <fw@strlen.de>"); |