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eb31628e TB |
1 | /* |
2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> | |
3 | * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org> | |
4 | * Copyright (c) 2012 Intel Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/ip.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/netlink.h> | |
18 | #include <linux/netfilter.h> | |
19 | #include <linux/netfilter_ipv4.h> | |
20 | #include <linux/netfilter/nfnetlink.h> | |
21 | #include <linux/netfilter/nf_tables.h> | |
22 | #include <net/netfilter/nf_conntrack.h> | |
23 | #include <net/netfilter/nf_nat.h> | |
24 | #include <net/netfilter/nf_nat_core.h> | |
25 | #include <net/netfilter/nf_tables.h> | |
26 | #include <net/netfilter/nf_nat_l3proto.h> | |
27 | #include <net/ip.h> | |
28 | ||
29 | struct nft_nat { | |
30 | enum nft_registers sreg_addr_min:8; | |
31 | enum nft_registers sreg_addr_max:8; | |
32 | enum nft_registers sreg_proto_min:8; | |
33 | enum nft_registers sreg_proto_max:8; | |
a4c2e8be PM |
34 | enum nf_nat_manip_type type:8; |
35 | u8 family; | |
e42eff8a | 36 | u16 flags; |
eb31628e TB |
37 | }; |
38 | ||
39 | static void nft_nat_eval(const struct nft_expr *expr, | |
40 | struct nft_data data[NFT_REG_MAX + 1], | |
41 | const struct nft_pktinfo *pkt) | |
42 | { | |
43 | const struct nft_nat *priv = nft_expr_priv(expr); | |
44 | enum ip_conntrack_info ctinfo; | |
45 | struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo); | |
46 | struct nf_nat_range range; | |
47 | ||
48 | memset(&range, 0, sizeof(range)); | |
49 | if (priv->sreg_addr_min) { | |
50 | if (priv->family == AF_INET) { | |
98c37b6b TB |
51 | range.min_addr.ip = (__force __be32) |
52 | data[priv->sreg_addr_min].data[0]; | |
53 | range.max_addr.ip = (__force __be32) | |
54 | data[priv->sreg_addr_max].data[0]; | |
eb31628e TB |
55 | |
56 | } else { | |
57 | memcpy(range.min_addr.ip6, | |
58 | data[priv->sreg_addr_min].data, | |
59 | sizeof(struct nft_data)); | |
60 | memcpy(range.max_addr.ip6, | |
61 | data[priv->sreg_addr_max].data, | |
62 | sizeof(struct nft_data)); | |
63 | } | |
64 | range.flags |= NF_NAT_RANGE_MAP_IPS; | |
65 | } | |
66 | ||
67 | if (priv->sreg_proto_min) { | |
7b5bca46 | 68 | range.min_proto.all = |
69 | *(__be16 *)&data[priv->sreg_proto_min].data[0]; | |
70 | range.max_proto.all = | |
71 | *(__be16 *)&data[priv->sreg_proto_max].data[0]; | |
eb31628e TB |
72 | range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; |
73 | } | |
74 | ||
e42eff8a AB |
75 | range.flags |= priv->flags; |
76 | ||
eb31628e TB |
77 | data[NFT_REG_VERDICT].verdict = |
78 | nf_nat_setup_info(ct, &range, priv->type); | |
79 | } | |
80 | ||
81 | static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = { | |
82 | [NFTA_NAT_TYPE] = { .type = NLA_U32 }, | |
83 | [NFTA_NAT_FAMILY] = { .type = NLA_U32 }, | |
84 | [NFTA_NAT_REG_ADDR_MIN] = { .type = NLA_U32 }, | |
85 | [NFTA_NAT_REG_ADDR_MAX] = { .type = NLA_U32 }, | |
86 | [NFTA_NAT_REG_PROTO_MIN] = { .type = NLA_U32 }, | |
87 | [NFTA_NAT_REG_PROTO_MAX] = { .type = NLA_U32 }, | |
e42eff8a | 88 | [NFTA_NAT_FLAGS] = { .type = NLA_U32 }, |
eb31628e TB |
89 | }; |
90 | ||
75e8d06d PNA |
91 | static int nft_nat_validate(const struct nft_ctx *ctx, |
92 | const struct nft_expr *expr, | |
93 | const struct nft_data **data) | |
eb31628e TB |
94 | { |
95 | struct nft_nat *priv = nft_expr_priv(expr); | |
96 | int err; | |
97 | ||
7210e4e3 PNA |
98 | err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); |
99 | if (err < 0) | |
100 | return err; | |
101 | ||
75e8d06d PNA |
102 | switch (priv->type) { |
103 | case NFT_NAT_SNAT: | |
104 | err = nft_chain_validate_hooks(ctx->chain, | |
105 | (1 << NF_INET_POST_ROUTING) | | |
106 | (1 << NF_INET_LOCAL_IN)); | |
107 | break; | |
108 | case NFT_NAT_DNAT: | |
109 | err = nft_chain_validate_hooks(ctx->chain, | |
110 | (1 << NF_INET_PRE_ROUTING) | | |
111 | (1 << NF_INET_LOCAL_OUT)); | |
112 | break; | |
113 | } | |
114 | ||
115 | return err; | |
116 | } | |
117 | ||
118 | static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
119 | const struct nlattr * const tb[]) | |
120 | { | |
121 | struct nft_nat *priv = nft_expr_priv(expr); | |
122 | u32 family; | |
123 | int err; | |
124 | ||
5c819a39 PNA |
125 | if (tb[NFTA_NAT_TYPE] == NULL || |
126 | (tb[NFTA_NAT_REG_ADDR_MIN] == NULL && | |
127 | tb[NFTA_NAT_REG_PROTO_MIN] == NULL)) | |
eb31628e TB |
128 | return -EINVAL; |
129 | ||
130 | switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) { | |
131 | case NFT_NAT_SNAT: | |
132 | priv->type = NF_NAT_MANIP_SRC; | |
133 | break; | |
134 | case NFT_NAT_DNAT: | |
135 | priv->type = NF_NAT_MANIP_DST; | |
136 | break; | |
137 | default: | |
138 | return -EINVAL; | |
139 | } | |
140 | ||
75e8d06d PNA |
141 | err = nft_nat_validate(ctx, expr, NULL); |
142 | if (err < 0) | |
143 | return err; | |
144 | ||
eb31628e TB |
145 | if (tb[NFTA_NAT_FAMILY] == NULL) |
146 | return -EINVAL; | |
147 | ||
a4c2e8be PM |
148 | family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY])); |
149 | if (family != AF_INET && family != AF_INET6) | |
150 | return -EAFNOSUPPORT; | |
151 | if (family != ctx->afi->family) | |
152 | return -EOPNOTSUPP; | |
153 | priv->family = family; | |
eb31628e TB |
154 | |
155 | if (tb[NFTA_NAT_REG_ADDR_MIN]) { | |
61cfac6b PNA |
156 | priv->sreg_addr_min = |
157 | ntohl(nla_get_be32(tb[NFTA_NAT_REG_ADDR_MIN])); | |
158 | ||
eb31628e TB |
159 | err = nft_validate_input_register(priv->sreg_addr_min); |
160 | if (err < 0) | |
161 | return err; | |
eb31628e | 162 | |
61cfac6b PNA |
163 | if (tb[NFTA_NAT_REG_ADDR_MAX]) { |
164 | priv->sreg_addr_max = | |
165 | ntohl(nla_get_be32(tb[NFTA_NAT_REG_ADDR_MAX])); | |
166 | ||
167 | err = nft_validate_input_register(priv->sreg_addr_max); | |
168 | if (err < 0) | |
169 | return err; | |
170 | } else { | |
171 | priv->sreg_addr_max = priv->sreg_addr_min; | |
172 | } | |
173 | } | |
eb31628e TB |
174 | |
175 | if (tb[NFTA_NAT_REG_PROTO_MIN]) { | |
61cfac6b PNA |
176 | priv->sreg_proto_min = |
177 | ntohl(nla_get_be32(tb[NFTA_NAT_REG_PROTO_MIN])); | |
178 | ||
eb31628e TB |
179 | err = nft_validate_input_register(priv->sreg_proto_min); |
180 | if (err < 0) | |
181 | return err; | |
eb31628e | 182 | |
61cfac6b PNA |
183 | if (tb[NFTA_NAT_REG_PROTO_MAX]) { |
184 | priv->sreg_proto_max = | |
185 | ntohl(nla_get_be32(tb[NFTA_NAT_REG_PROTO_MAX])); | |
186 | ||
187 | err = nft_validate_input_register(priv->sreg_proto_max); | |
188 | if (err < 0) | |
189 | return err; | |
190 | } else { | |
191 | priv->sreg_proto_max = priv->sreg_proto_min; | |
192 | } | |
193 | } | |
eb31628e | 194 | |
e42eff8a AB |
195 | if (tb[NFTA_NAT_FLAGS]) { |
196 | priv->flags = ntohl(nla_get_be32(tb[NFTA_NAT_FLAGS])); | |
197 | if (priv->flags & ~NF_NAT_RANGE_MASK) | |
198 | return -EINVAL; | |
199 | } | |
200 | ||
eb31628e TB |
201 | return 0; |
202 | } | |
203 | ||
204 | static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
205 | { | |
206 | const struct nft_nat *priv = nft_expr_priv(expr); | |
207 | ||
208 | switch (priv->type) { | |
209 | case NF_NAT_MANIP_SRC: | |
210 | if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT))) | |
211 | goto nla_put_failure; | |
212 | break; | |
213 | case NF_NAT_MANIP_DST: | |
214 | if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT))) | |
215 | goto nla_put_failure; | |
216 | break; | |
217 | } | |
218 | ||
219 | if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family))) | |
220 | goto nla_put_failure; | |
1e2d56a5 PNA |
221 | |
222 | if (priv->sreg_addr_min) { | |
223 | if (nla_put_be32(skb, NFTA_NAT_REG_ADDR_MIN, | |
224 | htonl(priv->sreg_addr_min)) || | |
225 | nla_put_be32(skb, NFTA_NAT_REG_ADDR_MAX, | |
226 | htonl(priv->sreg_addr_max))) | |
227 | goto nla_put_failure; | |
228 | } | |
229 | ||
91513606 PNA |
230 | if (priv->sreg_proto_min) { |
231 | if (nla_put_be32(skb, NFTA_NAT_REG_PROTO_MIN, | |
1e2d56a5 PNA |
232 | htonl(priv->sreg_proto_min)) || |
233 | nla_put_be32(skb, NFTA_NAT_REG_PROTO_MAX, | |
91513606 PNA |
234 | htonl(priv->sreg_proto_max))) |
235 | goto nla_put_failure; | |
236 | } | |
e42eff8a AB |
237 | |
238 | if (priv->flags != 0) { | |
239 | if (nla_put_be32(skb, NFTA_NAT_FLAGS, htonl(priv->flags))) | |
240 | goto nla_put_failure; | |
241 | } | |
242 | ||
eb31628e TB |
243 | return 0; |
244 | ||
245 | nla_put_failure: | |
246 | return -1; | |
247 | } | |
248 | ||
249 | static struct nft_expr_type nft_nat_type; | |
250 | static const struct nft_expr_ops nft_nat_ops = { | |
251 | .type = &nft_nat_type, | |
252 | .size = NFT_EXPR_SIZE(sizeof(struct nft_nat)), | |
253 | .eval = nft_nat_eval, | |
254 | .init = nft_nat_init, | |
255 | .dump = nft_nat_dump, | |
7210e4e3 | 256 | .validate = nft_nat_validate, |
eb31628e TB |
257 | }; |
258 | ||
259 | static struct nft_expr_type nft_nat_type __read_mostly = { | |
260 | .name = "nat", | |
261 | .ops = &nft_nat_ops, | |
262 | .policy = nft_nat_policy, | |
263 | .maxattr = NFTA_NAT_MAX, | |
264 | .owner = THIS_MODULE, | |
265 | }; | |
266 | ||
267 | static int __init nft_nat_module_init(void) | |
268 | { | |
a4c2e8be | 269 | return nft_register_expr(&nft_nat_type); |
eb31628e TB |
270 | } |
271 | ||
272 | static void __exit nft_nat_module_exit(void) | |
273 | { | |
274 | nft_unregister_expr(&nft_nat_type); | |
275 | } | |
276 | ||
277 | module_init(nft_nat_module_init); | |
278 | module_exit(nft_nat_module_exit); | |
279 | ||
280 | MODULE_LICENSE("GPL"); | |
281 | MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>"); | |
282 | MODULE_ALIAS_NFT_EXPR("nat"); |