~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/netfilter/nft_nat.c

Version: ~ [ linux-5.16-rc3 ] ~ [ linux-5.15.5 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.82 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.162 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.218 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.256 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.291 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.293 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         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 != ctx->afi->family)
150                 return -EOPNOTSUPP;
151 
152         switch (family) {
153         case NFPROTO_IPV4:
154                 alen = FIELD_SIZEOF(struct nf_nat_range, min_addr.ip);
155                 break;
156         case NFPROTO_IPV6:
157                 alen = FIELD_SIZEOF(struct nf_nat_range, min_addr.ip6);
158                 break;
159         default:
160                 return -EAFNOSUPPORT;
161         }
162         priv->family = family;
163 
164         if (tb[NFTA_NAT_REG_ADDR_MIN]) {
165                 priv->sreg_addr_min =
166                         nft_parse_register(tb[NFTA_NAT_REG_ADDR_MIN]);
167                 err = nft_validate_register_load(priv->sreg_addr_min, alen);
168                 if (err < 0)
169                         return err;
170 
171                 if (tb[NFTA_NAT_REG_ADDR_MAX]) {
172                         priv->sreg_addr_max =
173                                 nft_parse_register(tb[NFTA_NAT_REG_ADDR_MAX]);
174 
175                         err = nft_validate_register_load(priv->sreg_addr_max,
176                                                          alen);
177                         if (err < 0)
178                                 return err;
179                 } else {
180                         priv->sreg_addr_max = priv->sreg_addr_min;
181                 }
182         }
183 
184         plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
185         if (tb[NFTA_NAT_REG_PROTO_MIN]) {
186                 priv->sreg_proto_min =
187                         nft_parse_register(tb[NFTA_NAT_REG_PROTO_MIN]);
188 
189                 err = nft_validate_register_load(priv->sreg_proto_min, plen);
190                 if (err < 0)
191                         return err;
192 
193                 if (tb[NFTA_NAT_REG_PROTO_MAX]) {
194                         priv->sreg_proto_max =
195                                 nft_parse_register(tb[NFTA_NAT_REG_PROTO_MAX]);
196 
197                         err = nft_validate_register_load(priv->sreg_proto_max,
198                                                          plen);
199                         if (err < 0)
200                                 return err;
201                 } else {
202                         priv->sreg_proto_max = priv->sreg_proto_min;
203                 }
204         }
205 
206         if (tb[NFTA_NAT_FLAGS]) {
207                 priv->flags = ntohl(nla_get_be32(tb[NFTA_NAT_FLAGS]));
208                 if (priv->flags & ~NF_NAT_RANGE_MASK)
209                         return -EINVAL;
210         }
211 
212         return nf_ct_netns_get(ctx->net, family);
213 }
214 
215 static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr)
216 {
217         const struct nft_nat *priv = nft_expr_priv(expr);
218 
219         switch (priv->type) {
220         case NF_NAT_MANIP_SRC:
221                 if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
222                         goto nla_put_failure;
223                 break;
224         case NF_NAT_MANIP_DST:
225                 if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
226                         goto nla_put_failure;
227                 break;
228         }
229 
230         if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family)))
231                 goto nla_put_failure;
232 
233         if (priv->sreg_addr_min) {
234                 if (nft_dump_register(skb, NFTA_NAT_REG_ADDR_MIN,
235                                       priv->sreg_addr_min) ||
236                     nft_dump_register(skb, NFTA_NAT_REG_ADDR_MAX,
237                                       priv->sreg_addr_max))
238                         goto nla_put_failure;
239         }
240 
241         if (priv->sreg_proto_min) {
242                 if (nft_dump_register(skb, NFTA_NAT_REG_PROTO_MIN,
243                                       priv->sreg_proto_min) ||
244                     nft_dump_register(skb, NFTA_NAT_REG_PROTO_MAX,
245                                       priv->sreg_proto_max))
246                         goto nla_put_failure;
247         }
248 
249         if (priv->flags != 0) {
250                 if (nla_put_be32(skb, NFTA_NAT_FLAGS, htonl(priv->flags)))
251                         goto nla_put_failure;
252         }
253 
254         return 0;
255 
256 nla_put_failure:
257         return -1;
258 }
259 
260 static void
261 nft_nat_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
262 {
263         const struct nft_nat *priv = nft_expr_priv(expr);
264 
265         nf_ct_netns_put(ctx->net, priv->family);
266 }
267 
268 static struct nft_expr_type nft_nat_type;
269 static const struct nft_expr_ops nft_nat_ops = {
270         .type           = &nft_nat_type,
271         .size           = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
272         .eval           = nft_nat_eval,
273         .init           = nft_nat_init,
274         .destroy        = nft_nat_destroy,
275         .dump           = nft_nat_dump,
276         .validate       = nft_nat_validate,
277 };
278 
279 static struct nft_expr_type nft_nat_type __read_mostly = {
280         .name           = "nat",
281         .ops            = &nft_nat_ops,
282         .policy         = nft_nat_policy,
283         .maxattr        = NFTA_NAT_MAX,
284         .owner          = THIS_MODULE,
285 };
286 
287 static int __init nft_nat_module_init(void)
288 {
289         return nft_register_expr(&nft_nat_type);
290 }
291 
292 static void __exit nft_nat_module_exit(void)
293 {
294         nft_unregister_expr(&nft_nat_type);
295 }
296 
297 module_init(nft_nat_module_init);
298 module_exit(nft_nat_module_exit);
299 
300 MODULE_LICENSE("GPL");
301 MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
302 MODULE_ALIAS_NFT_EXPR("nat");
303 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp