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Linux/net/netfilter/nft_nat.c

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  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;
 34         enum nf_nat_manip_type  type:8;
 35         u8                      family;
 36         u16                     flags;
 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) {
 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];
 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) {
 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];
 72                 range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
 73         }
 74 
 75         range.flags |= priv->flags;
 76 
 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 },
 88         [NFTA_NAT_FLAGS]         = { .type = NLA_U32 },
 89 };
 90 
 91 static int nft_nat_validate(const struct nft_ctx *ctx,
 92                             const struct nft_expr *expr,
 93                             const struct nft_data **data)
 94 {
 95         struct nft_nat *priv = nft_expr_priv(expr);
 96         int err;
 97 
 98         err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
 99         if (err < 0)
100                 return err;
101 
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 
125         if (tb[NFTA_NAT_TYPE] == NULL ||
126             (tb[NFTA_NAT_REG_ADDR_MIN] == NULL &&
127              tb[NFTA_NAT_REG_PROTO_MIN] == NULL))
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 
141         err = nft_nat_validate(ctx, expr, NULL);
142         if (err < 0)
143                 return err;
144 
145         if (tb[NFTA_NAT_FAMILY] == NULL)
146                 return -EINVAL;
147 
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;
154 
155         if (tb[NFTA_NAT_REG_ADDR_MIN]) {
156                 priv->sreg_addr_min =
157                         ntohl(nla_get_be32(tb[NFTA_NAT_REG_ADDR_MIN]));
158 
159                 err = nft_validate_input_register(priv->sreg_addr_min);
160                 if (err < 0)
161                         return err;
162 
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         }
174 
175         if (tb[NFTA_NAT_REG_PROTO_MIN]) {
176                 priv->sreg_proto_min =
177                         ntohl(nla_get_be32(tb[NFTA_NAT_REG_PROTO_MIN]));
178 
179                 err = nft_validate_input_register(priv->sreg_proto_min);
180                 if (err < 0)
181                         return err;
182 
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         }
194 
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 
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;
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 
230         if (priv->sreg_proto_min) {
231                 if (nla_put_be32(skb, NFTA_NAT_REG_PROTO_MIN,
232                                  htonl(priv->sreg_proto_min)) ||
233                     nla_put_be32(skb, NFTA_NAT_REG_PROTO_MAX,
234                                  htonl(priv->sreg_proto_max)))
235                         goto nla_put_failure;
236         }
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 
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,
256         .validate       = nft_nat_validate,
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 {
269         return nft_register_expr(&nft_nat_type);
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");
283 

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