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554ced0a ME |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #include <linux/module.h> | |
3 | #include <linux/netfilter/nf_tables.h> | |
4 | #include <net/netfilter/nf_tables.h> | |
5 | #include <net/netfilter/nf_tables_core.h> | |
6 | #include <net/netfilter/nf_socket.h> | |
7 | #include <net/inet_sock.h> | |
8d6e5557 | 8 | #include <net/tcp.h> |
554ced0a ME |
9 | |
10 | struct nft_socket { | |
11 | enum nft_socket_keys key:8; | |
12 | union { | |
13 | enum nft_registers dreg:8; | |
14 | }; | |
15 | }; | |
16 | ||
17 | static void nft_socket_eval(const struct nft_expr *expr, | |
18 | struct nft_regs *regs, | |
19 | const struct nft_pktinfo *pkt) | |
20 | { | |
21 | const struct nft_socket *priv = nft_expr_priv(expr); | |
22 | struct sk_buff *skb = pkt->skb; | |
23 | struct sock *sk = skb->sk; | |
24 | u32 *dest = ®s->data[priv->dreg]; | |
25 | ||
f5646501 FL |
26 | if (sk && !net_eq(nft_net(pkt), sock_net(sk))) |
27 | sk = NULL; | |
28 | ||
554ced0a ME |
29 | if (!sk) |
30 | switch(nft_pf(pkt)) { | |
31 | case NFPROTO_IPV4: | |
32 | sk = nf_sk_lookup_slow_v4(nft_net(pkt), skb, nft_in(pkt)); | |
33 | break; | |
5d400a49 | 34 | #if IS_ENABLED(CONFIG_NF_TABLES_IPV6) |
554ced0a ME |
35 | case NFPROTO_IPV6: |
36 | sk = nf_sk_lookup_slow_v6(nft_net(pkt), skb, nft_in(pkt)); | |
37 | break; | |
38 | #endif | |
39 | default: | |
40 | WARN_ON_ONCE(1); | |
41 | regs->verdict.code = NFT_BREAK; | |
42 | return; | |
43 | } | |
44 | ||
f5646501 | 45 | if (!sk) { |
365b5a36 | 46 | regs->verdict.code = NFT_BREAK; |
554ced0a ME |
47 | return; |
48 | } | |
49 | ||
50 | /* So that subsequent socket matching not to require other lookups. */ | |
51 | skb->sk = sk; | |
52 | ||
53 | switch(priv->key) { | |
54 | case NFT_SOCKET_TRANSPARENT: | |
8d6e5557 | 55 | nft_reg_store8(dest, inet_sk_transparent(sk)); |
554ced0a | 56 | break; |
7d25f885 ME |
57 | case NFT_SOCKET_MARK: |
58 | if (sk_fullsock(sk)) { | |
59 | *dest = sk->sk_mark; | |
60 | } else { | |
61 | regs->verdict.code = NFT_BREAK; | |
62 | return; | |
63 | } | |
64 | break; | |
554ced0a ME |
65 | default: |
66 | WARN_ON(1); | |
67 | regs->verdict.code = NFT_BREAK; | |
68 | } | |
69 | } | |
70 | ||
71 | static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = { | |
72 | [NFTA_SOCKET_KEY] = { .type = NLA_U32 }, | |
73 | [NFTA_SOCKET_DREG] = { .type = NLA_U32 }, | |
74 | }; | |
75 | ||
76 | static int nft_socket_init(const struct nft_ctx *ctx, | |
77 | const struct nft_expr *expr, | |
78 | const struct nlattr * const tb[]) | |
79 | { | |
80 | struct nft_socket *priv = nft_expr_priv(expr); | |
81 | unsigned int len; | |
82 | ||
83 | if (!tb[NFTA_SOCKET_DREG] || !tb[NFTA_SOCKET_KEY]) | |
84 | return -EINVAL; | |
85 | ||
86 | switch(ctx->family) { | |
87 | case NFPROTO_IPV4: | |
5d400a49 | 88 | #if IS_ENABLED(CONFIG_NF_TABLES_IPV6) |
554ced0a ME |
89 | case NFPROTO_IPV6: |
90 | #endif | |
91 | case NFPROTO_INET: | |
92 | break; | |
93 | default: | |
94 | return -EOPNOTSUPP; | |
95 | } | |
96 | ||
97 | priv->key = ntohl(nla_get_u32(tb[NFTA_SOCKET_KEY])); | |
98 | switch(priv->key) { | |
99 | case NFT_SOCKET_TRANSPARENT: | |
100 | len = sizeof(u8); | |
101 | break; | |
7d25f885 ME |
102 | case NFT_SOCKET_MARK: |
103 | len = sizeof(u32); | |
104 | break; | |
554ced0a ME |
105 | default: |
106 | return -EOPNOTSUPP; | |
107 | } | |
108 | ||
109 | priv->dreg = nft_parse_register(tb[NFTA_SOCKET_DREG]); | |
110 | return nft_validate_register_store(ctx, priv->dreg, NULL, | |
111 | NFT_DATA_VALUE, len); | |
112 | } | |
113 | ||
114 | static int nft_socket_dump(struct sk_buff *skb, | |
115 | const struct nft_expr *expr) | |
116 | { | |
117 | const struct nft_socket *priv = nft_expr_priv(expr); | |
118 | ||
119 | if (nla_put_u32(skb, NFTA_SOCKET_KEY, htonl(priv->key))) | |
120 | return -1; | |
121 | if (nft_dump_register(skb, NFTA_SOCKET_DREG, priv->dreg)) | |
122 | return -1; | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static struct nft_expr_type nft_socket_type; | |
127 | static const struct nft_expr_ops nft_socket_ops = { | |
128 | .type = &nft_socket_type, | |
129 | .size = NFT_EXPR_SIZE(sizeof(struct nft_socket)), | |
130 | .eval = nft_socket_eval, | |
131 | .init = nft_socket_init, | |
132 | .dump = nft_socket_dump, | |
133 | }; | |
134 | ||
135 | static struct nft_expr_type nft_socket_type __read_mostly = { | |
136 | .name = "socket", | |
137 | .ops = &nft_socket_ops, | |
138 | .policy = nft_socket_policy, | |
139 | .maxattr = NFTA_SOCKET_MAX, | |
140 | .owner = THIS_MODULE, | |
141 | }; | |
142 | ||
143 | static int __init nft_socket_module_init(void) | |
144 | { | |
145 | return nft_register_expr(&nft_socket_type); | |
146 | } | |
147 | ||
148 | static void __exit nft_socket_module_exit(void) | |
149 | { | |
150 | nft_unregister_expr(&nft_socket_type); | |
151 | } | |
152 | ||
153 | module_init(nft_socket_module_init); | |
154 | module_exit(nft_socket_module_exit); | |
155 | ||
156 | MODULE_LICENSE("GPL"); | |
157 | MODULE_AUTHOR("Máté Eckl"); | |
158 | MODULE_DESCRIPTION("nf_tables socket match module"); | |
3fb61eca | 159 | MODULE_ALIAS_NFT_EXPR("socket"); |