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f6d0cbcf FW |
1 | /* |
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. | |
5 | * | |
6 | * Generic part shared by ipv4 and ipv6 backends. | |
7 | */ | |
8 | ||
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> | |
18 | ||
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 }, | |
23 | }; | |
24 | EXPORT_SYMBOL(nft_fib_policy); | |
25 | ||
26 | #define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \ | |
055c4b34 PS |
27 | NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF | \ |
28 | NFTA_FIB_F_PRESENT) | |
f6d0cbcf FW |
29 | |
30 | int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
31 | const struct nft_data **data) | |
32 | { | |
33 | const struct nft_fib *priv = nft_expr_priv(expr); | |
34 | unsigned int hooks; | |
35 | ||
36 | switch (priv->result) { | |
37 | case NFT_FIB_RESULT_OIF: /* fallthrough */ | |
38 | case NFT_FIB_RESULT_OIFNAME: | |
39 | hooks = (1 << NF_INET_PRE_ROUTING); | |
40 | break; | |
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); | |
50 | else | |
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); | |
56 | ||
57 | break; | |
58 | default: | |
59 | return -EINVAL; | |
60 | } | |
61 | ||
62 | return nft_chain_validate_hooks(ctx->chain, hooks); | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(nft_fib_validate); | |
65 | ||
66 | int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
67 | const struct nlattr * const tb[]) | |
68 | { | |
69 | struct nft_fib *priv = nft_expr_priv(expr); | |
70 | unsigned int len; | |
71 | int err; | |
72 | ||
73 | if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS]) | |
74 | return -EINVAL; | |
75 | ||
76 | priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS])); | |
77 | ||
78 | if (priv->flags == 0 || (priv->flags & ~NFTA_FIB_F_ALL)) | |
79 | return -EINVAL; | |
80 | ||
81 | if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == | |
82 | (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) | |
83 | return -EINVAL; | |
84 | if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) == | |
85 | (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) | |
86 | return -EINVAL; | |
87 | if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0) | |
88 | return -EINVAL; | |
89 | ||
11583438 | 90 | priv->result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT])); |
f6d0cbcf FW |
91 | priv->dreg = nft_parse_register(tb[NFTA_FIB_DREG]); |
92 | ||
93 | switch (priv->result) { | |
94 | case NFT_FIB_RESULT_OIF: | |
95 | if (priv->flags & NFTA_FIB_F_OIF) | |
96 | return -EINVAL; | |
97 | len = sizeof(int); | |
98 | break; | |
99 | case NFT_FIB_RESULT_OIFNAME: | |
100 | if (priv->flags & NFTA_FIB_F_OIF) | |
101 | return -EINVAL; | |
102 | len = IFNAMSIZ; | |
103 | break; | |
104 | case NFT_FIB_RESULT_ADDRTYPE: | |
105 | len = sizeof(u32); | |
106 | break; | |
107 | default: | |
108 | return -EINVAL; | |
109 | } | |
110 | ||
111 | err = nft_validate_register_store(ctx, priv->dreg, NULL, | |
112 | NFT_DATA_VALUE, len); | |
113 | if (err < 0) | |
114 | return err; | |
115 | ||
c56e3956 | 116 | return 0; |
f6d0cbcf FW |
117 | } |
118 | EXPORT_SYMBOL_GPL(nft_fib_init); | |
119 | ||
120 | int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
121 | { | |
122 | const struct nft_fib *priv = nft_expr_priv(expr); | |
123 | ||
124 | if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg)) | |
125 | return -1; | |
126 | ||
127 | if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result))) | |
128 | return -1; | |
129 | ||
130 | if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags))) | |
131 | return -1; | |
132 | ||
133 | return 0; | |
134 | } | |
135 | EXPORT_SYMBOL_GPL(nft_fib_dump); | |
136 | ||
055c4b34 | 137 | void nft_fib_store_result(void *reg, const struct nft_fib *priv, |
f6d0cbcf FW |
138 | const struct nft_pktinfo *pkt, int index) |
139 | { | |
140 | struct net_device *dev; | |
141 | u32 *dreg = reg; | |
142 | ||
055c4b34 | 143 | switch (priv->result) { |
f6d0cbcf | 144 | case NFT_FIB_RESULT_OIF: |
055c4b34 | 145 | *dreg = (priv->flags & NFTA_FIB_F_PRESENT) ? !!index : index; |
f6d0cbcf FW |
146 | break; |
147 | case NFT_FIB_RESULT_OIFNAME: | |
0e5a1c7e | 148 | dev = dev_get_by_index_rcu(nft_net(pkt), index); |
055c4b34 PS |
149 | if (priv->flags & NFTA_FIB_F_PRESENT) |
150 | *dreg = !!dev; | |
151 | else | |
152 | strncpy(reg, dev ? dev->name : "", IFNAMSIZ); | |
f6d0cbcf FW |
153 | break; |
154 | default: | |
155 | WARN_ON_ONCE(1); | |
156 | *dreg = 0; | |
157 | break; | |
158 | } | |
159 | } | |
160 | EXPORT_SYMBOL_GPL(nft_fib_store_result); | |
161 | ||
162 | MODULE_LICENSE("GPL"); | |
163 | MODULE_AUTHOR("Florian Westphal <fw@strlen.de>"); |