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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) { | |
98c37b6b TB |
68 | range.min_proto.all = (__force __be16) |
69 | data[priv->sreg_proto_min].data[0]; | |
70 | range.max_proto.all = (__force __be16) | |
71 | 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 | ||
91 | static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
92 | const struct nlattr * const tb[]) | |
93 | { | |
94 | struct nft_nat *priv = nft_expr_priv(expr); | |
a4c2e8be | 95 | u32 family; |
eb31628e TB |
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 | ||
eb31628e TB |
102 | if (tb[NFTA_NAT_TYPE] == NULL) |
103 | return -EINVAL; | |
104 | ||
105 | switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) { | |
106 | case NFT_NAT_SNAT: | |
107 | priv->type = NF_NAT_MANIP_SRC; | |
108 | break; | |
109 | case NFT_NAT_DNAT: | |
110 | priv->type = NF_NAT_MANIP_DST; | |
111 | break; | |
112 | default: | |
113 | return -EINVAL; | |
114 | } | |
115 | ||
116 | if (tb[NFTA_NAT_FAMILY] == NULL) | |
117 | return -EINVAL; | |
118 | ||
a4c2e8be PM |
119 | family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY])); |
120 | if (family != AF_INET && family != AF_INET6) | |
121 | return -EAFNOSUPPORT; | |
122 | if (family != ctx->afi->family) | |
123 | return -EOPNOTSUPP; | |
124 | priv->family = family; | |
eb31628e TB |
125 | |
126 | if (tb[NFTA_NAT_REG_ADDR_MIN]) { | |
127 | priv->sreg_addr_min = ntohl(nla_get_be32( | |
128 | tb[NFTA_NAT_REG_ADDR_MIN])); | |
129 | err = nft_validate_input_register(priv->sreg_addr_min); | |
130 | if (err < 0) | |
131 | return err; | |
132 | } | |
133 | ||
134 | if (tb[NFTA_NAT_REG_ADDR_MAX]) { | |
135 | priv->sreg_addr_max = ntohl(nla_get_be32( | |
136 | tb[NFTA_NAT_REG_ADDR_MAX])); | |
137 | err = nft_validate_input_register(priv->sreg_addr_max); | |
138 | if (err < 0) | |
139 | return err; | |
140 | } else | |
141 | priv->sreg_addr_max = priv->sreg_addr_min; | |
142 | ||
143 | if (tb[NFTA_NAT_REG_PROTO_MIN]) { | |
144 | priv->sreg_proto_min = ntohl(nla_get_be32( | |
145 | tb[NFTA_NAT_REG_PROTO_MIN])); | |
146 | err = nft_validate_input_register(priv->sreg_proto_min); | |
147 | if (err < 0) | |
148 | return err; | |
149 | } | |
150 | ||
151 | if (tb[NFTA_NAT_REG_PROTO_MAX]) { | |
152 | priv->sreg_proto_max = ntohl(nla_get_be32( | |
153 | tb[NFTA_NAT_REG_PROTO_MAX])); | |
154 | err = nft_validate_input_register(priv->sreg_proto_max); | |
155 | if (err < 0) | |
156 | return err; | |
157 | } else | |
158 | priv->sreg_proto_max = priv->sreg_proto_min; | |
159 | ||
e42eff8a AB |
160 | if (tb[NFTA_NAT_FLAGS]) { |
161 | priv->flags = ntohl(nla_get_be32(tb[NFTA_NAT_FLAGS])); | |
162 | if (priv->flags & ~NF_NAT_RANGE_MASK) | |
163 | return -EINVAL; | |
164 | } | |
165 | ||
eb31628e TB |
166 | return 0; |
167 | } | |
168 | ||
169 | static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
170 | { | |
171 | const struct nft_nat *priv = nft_expr_priv(expr); | |
172 | ||
173 | switch (priv->type) { | |
174 | case NF_NAT_MANIP_SRC: | |
175 | if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT))) | |
176 | goto nla_put_failure; | |
177 | break; | |
178 | case NF_NAT_MANIP_DST: | |
179 | if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT))) | |
180 | goto nla_put_failure; | |
181 | break; | |
182 | } | |
183 | ||
184 | if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family))) | |
185 | goto nla_put_failure; | |
186 | if (nla_put_be32(skb, | |
187 | NFTA_NAT_REG_ADDR_MIN, htonl(priv->sreg_addr_min))) | |
188 | goto nla_put_failure; | |
189 | if (nla_put_be32(skb, | |
190 | NFTA_NAT_REG_ADDR_MAX, htonl(priv->sreg_addr_max))) | |
191 | goto nla_put_failure; | |
91513606 PNA |
192 | if (priv->sreg_proto_min) { |
193 | if (nla_put_be32(skb, NFTA_NAT_REG_PROTO_MIN, | |
194 | htonl(priv->sreg_proto_min))) | |
195 | goto nla_put_failure; | |
196 | if (nla_put_be32(skb, NFTA_NAT_REG_PROTO_MAX, | |
197 | htonl(priv->sreg_proto_max))) | |
198 | goto nla_put_failure; | |
199 | } | |
e42eff8a AB |
200 | |
201 | if (priv->flags != 0) { | |
202 | if (nla_put_be32(skb, NFTA_NAT_FLAGS, htonl(priv->flags))) | |
203 | goto nla_put_failure; | |
204 | } | |
205 | ||
eb31628e TB |
206 | return 0; |
207 | ||
208 | nla_put_failure: | |
209 | return -1; | |
210 | } | |
211 | ||
7210e4e3 PNA |
212 | static int nft_nat_validate(const struct nft_ctx *ctx, |
213 | const struct nft_expr *expr, | |
214 | const struct nft_data **data) | |
215 | { | |
216 | return nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); | |
217 | } | |
218 | ||
eb31628e TB |
219 | static struct nft_expr_type nft_nat_type; |
220 | static const struct nft_expr_ops nft_nat_ops = { | |
221 | .type = &nft_nat_type, | |
222 | .size = NFT_EXPR_SIZE(sizeof(struct nft_nat)), | |
223 | .eval = nft_nat_eval, | |
224 | .init = nft_nat_init, | |
225 | .dump = nft_nat_dump, | |
7210e4e3 | 226 | .validate = nft_nat_validate, |
eb31628e TB |
227 | }; |
228 | ||
229 | static struct nft_expr_type nft_nat_type __read_mostly = { | |
230 | .name = "nat", | |
231 | .ops = &nft_nat_ops, | |
232 | .policy = nft_nat_policy, | |
233 | .maxattr = NFTA_NAT_MAX, | |
234 | .owner = THIS_MODULE, | |
235 | }; | |
236 | ||
237 | static int __init nft_nat_module_init(void) | |
238 | { | |
a4c2e8be | 239 | return nft_register_expr(&nft_nat_type); |
eb31628e TB |
240 | } |
241 | ||
242 | static void __exit nft_nat_module_exit(void) | |
243 | { | |
244 | nft_unregister_expr(&nft_nat_type); | |
245 | } | |
246 | ||
247 | module_init(nft_nat_module_init); | |
248 | module_exit(nft_nat_module_exit); | |
249 | ||
250 | MODULE_LICENSE("GPL"); | |
251 | MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>"); | |
252 | MODULE_ALIAS_NFT_EXPR("nat"); |