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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_regs *regs,
 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                                         regs->data[priv->sreg_addr_min];
 53                         range.max_addr.ip = (__force __be32)
 54                                         regs->data[priv->sreg_addr_max];
 55 
 56                 } else {
 57                         memcpy(range.min_addr.ip6,
 58                                &regs->data[priv->sreg_addr_min],
 59                                sizeof(range.min_addr.ip6));
 60                         memcpy(range.max_addr.ip6,
 61                                &regs->data[priv->sreg_addr_max],
 62                                sizeof(range.max_addr.ip6));
 63                 }
 64                 range.flags |= NF_NAT_RANGE_MAP_IPS;
 65         }
 66 
 67         if (priv->sreg_proto_min) {
 68                 range.min_proto.all = (__force __be16)nft_reg_load16(
 69                         &regs->data[priv->sreg_proto_min]);
 70                 range.max_proto.all = (__force __be16)nft_reg_load16(
 71                         &regs->data[priv->sreg_proto_max]);
 72                 range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
 73         }
 74 
 75         range.flags |= priv->flags;
 76 
 77         regs->verdict.code = nf_nat_setup_info(ct, &range, priv->type);
 78 }
 79 
 80 static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = {
 81         [NFTA_NAT_TYPE]          = { .type = NLA_U32 },
 82         [NFTA_NAT_FAMILY]        = { .type = NLA_U32 },
 83         [NFTA_NAT_REG_ADDR_MIN]  = { .type = NLA_U32 },
 84         [NFTA_NAT_REG_ADDR_MAX]  = { .type = NLA_U32 },
 85         [NFTA_NAT_REG_PROTO_MIN] = { .type = NLA_U32 },
 86         [NFTA_NAT_REG_PROTO_MAX] = { .type = NLA_U32 },
 87         [NFTA_NAT_FLAGS]         = { .type = NLA_U32 },
 88 };
 89 
 90 static int nft_nat_validate(const struct nft_ctx *ctx,
 91                             const struct nft_expr *expr,
 92                             const struct nft_data **data)
 93 {
 94         struct nft_nat *priv = nft_expr_priv(expr);
 95         int err;
 96 
 97         err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
 98         if (err < 0)
 99                 return err;
100 
101         switch (priv->type) {
102         case NFT_NAT_SNAT:
103                 err = nft_chain_validate_hooks(ctx->chain,
104                                                (1 << NF_INET_POST_ROUTING) |
105                                                (1 << NF_INET_LOCAL_IN));
106                 break;
107         case NFT_NAT_DNAT:
108                 err = nft_chain_validate_hooks(ctx->chain,
109                                                (1 << NF_INET_PRE_ROUTING) |
110                                                (1 << NF_INET_LOCAL_OUT));
111                 break;
112         }
113 
114         return err;
115 }
116 
117 static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
118                         const struct nlattr * const tb[])
119 {
120         struct nft_nat *priv = nft_expr_priv(expr);
121         unsigned int alen, plen;
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         if (tb[NFTA_NAT_FAMILY] == NULL)
142                 return -EINVAL;
143 
144         family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
145         if (family != ctx->afi->family)
146                 return -EOPNOTSUPP;
147 
148         switch (family) {
149         case NFPROTO_IPV4:
150                 alen = FIELD_SIZEOF(struct nf_nat_range, min_addr.ip);
151                 break;
152         case NFPROTO_IPV6:
153                 alen = FIELD_SIZEOF(struct nf_nat_range, min_addr.ip6);
154                 break;
155         default:
156                 return -EAFNOSUPPORT;
157         }
158         priv->family = family;
159 
160         if (tb[NFTA_NAT_REG_ADDR_MIN]) {
161                 priv->sreg_addr_min =
162                         nft_parse_register(tb[NFTA_NAT_REG_ADDR_MIN]);
163                 err = nft_validate_register_load(priv->sreg_addr_min, alen);
164                 if (err < 0)
165                         return err;
166 
167                 if (tb[NFTA_NAT_REG_ADDR_MAX]) {
168                         priv->sreg_addr_max =
169                                 nft_parse_register(tb[NFTA_NAT_REG_ADDR_MAX]);
170 
171                         err = nft_validate_register_load(priv->sreg_addr_max,
172                                                          alen);
173                         if (err < 0)
174                                 return err;
175                 } else {
176                         priv->sreg_addr_max = priv->sreg_addr_min;
177                 }
178         }
179 
180         plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
181         if (tb[NFTA_NAT_REG_PROTO_MIN]) {
182                 priv->sreg_proto_min =
183                         nft_parse_register(tb[NFTA_NAT_REG_PROTO_MIN]);
184 
185                 err = nft_validate_register_load(priv->sreg_proto_min, plen);
186                 if (err < 0)
187                         return err;
188 
189                 if (tb[NFTA_NAT_REG_PROTO_MAX]) {
190                         priv->sreg_proto_max =
191                                 nft_parse_register(tb[NFTA_NAT_REG_PROTO_MAX]);
192 
193                         err = nft_validate_register_load(priv->sreg_proto_max,
194                                                          plen);
195                         if (err < 0)
196                                 return err;
197                 } else {
198                         priv->sreg_proto_max = priv->sreg_proto_min;
199                 }
200         }
201 
202         if (tb[NFTA_NAT_FLAGS]) {
203                 priv->flags = ntohl(nla_get_be32(tb[NFTA_NAT_FLAGS]));
204                 if (priv->flags & ~NF_NAT_RANGE_MASK)
205                         return -EINVAL;
206         }
207 
208         return nf_ct_netns_get(ctx->net, family);
209 }
210 
211 static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr)
212 {
213         const struct nft_nat *priv = nft_expr_priv(expr);
214 
215         switch (priv->type) {
216         case NF_NAT_MANIP_SRC:
217                 if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
218                         goto nla_put_failure;
219                 break;
220         case NF_NAT_MANIP_DST:
221                 if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
222                         goto nla_put_failure;
223                 break;
224         }
225 
226         if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family)))
227                 goto nla_put_failure;
228 
229         if (priv->sreg_addr_min) {
230                 if (nft_dump_register(skb, NFTA_NAT_REG_ADDR_MIN,
231                                       priv->sreg_addr_min) ||
232                     nft_dump_register(skb, NFTA_NAT_REG_ADDR_MAX,
233                                       priv->sreg_addr_max))
234                         goto nla_put_failure;
235         }
236 
237         if (priv->sreg_proto_min) {
238                 if (nft_dump_register(skb, NFTA_NAT_REG_PROTO_MIN,
239                                       priv->sreg_proto_min) ||
240                     nft_dump_register(skb, NFTA_NAT_REG_PROTO_MAX,
241                                       priv->sreg_proto_max))
242                         goto nla_put_failure;
243         }
244 
245         if (priv->flags != 0) {
246                 if (nla_put_be32(skb, NFTA_NAT_FLAGS, htonl(priv->flags)))
247                         goto nla_put_failure;
248         }
249 
250         return 0;
251 
252 nla_put_failure:
253         return -1;
254 }
255 
256 static void
257 nft_nat_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
258 {
259         const struct nft_nat *priv = nft_expr_priv(expr);
260 
261         nf_ct_netns_put(ctx->net, priv->family);
262 }
263 
264 static struct nft_expr_type nft_nat_type;
265 static const struct nft_expr_ops nft_nat_ops = {
266         .type           = &nft_nat_type,
267         .size           = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
268         .eval           = nft_nat_eval,
269         .init           = nft_nat_init,
270         .destroy        = nft_nat_destroy,
271         .dump           = nft_nat_dump,
272         .validate       = nft_nat_validate,
273 };
274 
275 static struct nft_expr_type nft_nat_type __read_mostly = {
276         .name           = "nat",
277         .ops            = &nft_nat_ops,
278         .policy         = nft_nat_policy,
279         .maxattr        = NFTA_NAT_MAX,
280         .owner          = THIS_MODULE,
281 };
282 
283 static int __init nft_nat_module_init(void)
284 {
285         return nft_register_expr(&nft_nat_type);
286 }
287 
288 static void __exit nft_nat_module_exit(void)
289 {
290         nft_unregister_expr(&nft_nat_type);
291 }
292 
293 module_init(nft_nat_module_init);
294 module_exit(nft_nat_module_exit);
295 
296 MODULE_LICENSE("GPL");
297 MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
298 MODULE_ALIAS_NFT_EXPR("nat");
299 

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