Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * Development of IPv6 NAT funded by Astaro. |
| 9 | */ |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/skbuff.h> |
| 13 | #include <linux/ipv6.h> |
| 14 | #include <linux/netfilter.h> |
| 15 | #include <linux/netfilter_ipv6.h> |
| 16 | #include <net/secure_seq.h> |
| 17 | #include <net/checksum.h> |
Stephen Rothwell | 2c96932 | 2012-09-05 15:34:58 +1000 | [diff] [blame] | 18 | #include <net/ip6_checksum.h> |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 19 | #include <net/ip6_route.h> |
| 20 | #include <net/ipv6.h> |
| 21 | |
| 22 | #include <net/netfilter/nf_conntrack_core.h> |
| 23 | #include <net/netfilter/nf_conntrack.h> |
| 24 | #include <net/netfilter/nf_nat_core.h> |
| 25 | #include <net/netfilter/nf_nat_l3proto.h> |
| 26 | #include <net/netfilter/nf_nat_l4proto.h> |
| 27 | |
| 28 | static const struct nf_nat_l3proto nf_nat_l3proto_ipv6; |
| 29 | |
| 30 | #ifdef CONFIG_XFRM |
| 31 | static void nf_nat_ipv6_decode_session(struct sk_buff *skb, |
| 32 | const struct nf_conn *ct, |
| 33 | enum ip_conntrack_dir dir, |
| 34 | unsigned long statusbit, |
| 35 | struct flowi *fl) |
| 36 | { |
| 37 | const struct nf_conntrack_tuple *t = &ct->tuplehash[dir].tuple; |
| 38 | struct flowi6 *fl6 = &fl->u.ip6; |
| 39 | |
| 40 | if (ct->status & statusbit) { |
| 41 | fl6->daddr = t->dst.u3.in6; |
| 42 | if (t->dst.protonum == IPPROTO_TCP || |
| 43 | t->dst.protonum == IPPROTO_UDP || |
| 44 | t->dst.protonum == IPPROTO_UDPLITE || |
| 45 | t->dst.protonum == IPPROTO_DCCP || |
| 46 | t->dst.protonum == IPPROTO_SCTP) |
| 47 | fl6->fl6_dport = t->dst.u.all; |
| 48 | } |
| 49 | |
| 50 | statusbit ^= IPS_NAT_MASK; |
| 51 | |
| 52 | if (ct->status & statusbit) { |
| 53 | fl6->saddr = t->src.u3.in6; |
| 54 | if (t->dst.protonum == IPPROTO_TCP || |
| 55 | t->dst.protonum == IPPROTO_UDP || |
| 56 | t->dst.protonum == IPPROTO_UDPLITE || |
| 57 | t->dst.protonum == IPPROTO_DCCP || |
| 58 | t->dst.protonum == IPPROTO_SCTP) |
| 59 | fl6->fl6_sport = t->src.u.all; |
| 60 | } |
| 61 | } |
| 62 | #endif |
| 63 | |
| 64 | static bool nf_nat_ipv6_in_range(const struct nf_conntrack_tuple *t, |
| 65 | const struct nf_nat_range *range) |
| 66 | { |
| 67 | return ipv6_addr_cmp(&t->src.u3.in6, &range->min_addr.in6) >= 0 && |
| 68 | ipv6_addr_cmp(&t->src.u3.in6, &range->max_addr.in6) <= 0; |
| 69 | } |
| 70 | |
| 71 | static u32 nf_nat_ipv6_secure_port(const struct nf_conntrack_tuple *t, |
| 72 | __be16 dport) |
| 73 | { |
| 74 | return secure_ipv6_port_ephemeral(t->src.u3.ip6, t->dst.u3.ip6, dport); |
| 75 | } |
| 76 | |
| 77 | static bool nf_nat_ipv6_manip_pkt(struct sk_buff *skb, |
| 78 | unsigned int iphdroff, |
| 79 | const struct nf_nat_l4proto *l4proto, |
| 80 | const struct nf_conntrack_tuple *target, |
| 81 | enum nf_nat_manip_type maniptype) |
| 82 | { |
| 83 | struct ipv6hdr *ipv6h; |
| 84 | __be16 frag_off; |
| 85 | int hdroff; |
| 86 | u8 nexthdr; |
| 87 | |
| 88 | if (!skb_make_writable(skb, iphdroff + sizeof(*ipv6h))) |
| 89 | return false; |
| 90 | |
| 91 | ipv6h = (void *)skb->data + iphdroff; |
| 92 | nexthdr = ipv6h->nexthdr; |
| 93 | hdroff = ipv6_skip_exthdr(skb, iphdroff + sizeof(*ipv6h), |
| 94 | &nexthdr, &frag_off); |
| 95 | if (hdroff < 0) |
| 96 | goto manip_addr; |
| 97 | |
| 98 | if ((frag_off & htons(~0x7)) == 0 && |
| 99 | !l4proto->manip_pkt(skb, &nf_nat_l3proto_ipv6, iphdroff, hdroff, |
| 100 | target, maniptype)) |
| 101 | return false; |
| 102 | manip_addr: |
| 103 | if (maniptype == NF_NAT_MANIP_SRC) |
| 104 | ipv6h->saddr = target->src.u3.in6; |
| 105 | else |
| 106 | ipv6h->daddr = target->dst.u3.in6; |
| 107 | |
| 108 | return true; |
| 109 | } |
| 110 | |
| 111 | static void nf_nat_ipv6_csum_update(struct sk_buff *skb, |
| 112 | unsigned int iphdroff, __sum16 *check, |
| 113 | const struct nf_conntrack_tuple *t, |
| 114 | enum nf_nat_manip_type maniptype) |
| 115 | { |
| 116 | const struct ipv6hdr *ipv6h = (struct ipv6hdr *)(skb->data + iphdroff); |
| 117 | const struct in6_addr *oldip, *newip; |
| 118 | |
| 119 | if (maniptype == NF_NAT_MANIP_SRC) { |
| 120 | oldip = &ipv6h->saddr; |
| 121 | newip = &t->src.u3.in6; |
| 122 | } else { |
| 123 | oldip = &ipv6h->daddr; |
| 124 | newip = &t->dst.u3.in6; |
| 125 | } |
| 126 | inet_proto_csum_replace16(check, skb, oldip->s6_addr32, |
Tom Herbert | 4b048d6 | 2015-08-17 13:42:25 -0700 | [diff] [blame] | 127 | newip->s6_addr32, true); |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | static void nf_nat_ipv6_csum_recalc(struct sk_buff *skb, |
| 131 | u8 proto, void *data, __sum16 *check, |
| 132 | int datalen, int oldlen) |
| 133 | { |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 134 | if (skb->ip_summed != CHECKSUM_PARTIAL) { |
Jarno Rajahalme | 2646190 | 2016-03-10 10:54:17 -0800 | [diff] [blame] | 135 | const struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
| 136 | |
| 137 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 138 | skb->csum_start = skb_headroom(skb) + skb_network_offset(skb) + |
| 139 | (data - (void *)skb->data); |
| 140 | skb->csum_offset = (void *)check - data; |
| 141 | *check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, |
| 142 | datalen, proto, 0); |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 143 | } else |
| 144 | inet_proto_csum_replace2(check, skb, |
Tom Herbert | 4b048d6 | 2015-08-17 13:42:25 -0700 | [diff] [blame] | 145 | htons(oldlen), htons(datalen), true); |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 146 | } |
| 147 | |
Duan Jiong | 24de3d3 | 2014-06-30 09:19:32 +0800 | [diff] [blame] | 148 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 149 | static int nf_nat_ipv6_nlattr_to_range(struct nlattr *tb[], |
| 150 | struct nf_nat_range *range) |
| 151 | { |
| 152 | if (tb[CTA_NAT_V6_MINIP]) { |
| 153 | nla_memcpy(&range->min_addr.ip6, tb[CTA_NAT_V6_MINIP], |
| 154 | sizeof(struct in6_addr)); |
| 155 | range->flags |= NF_NAT_RANGE_MAP_IPS; |
| 156 | } |
| 157 | |
| 158 | if (tb[CTA_NAT_V6_MAXIP]) |
| 159 | nla_memcpy(&range->max_addr.ip6, tb[CTA_NAT_V6_MAXIP], |
| 160 | sizeof(struct in6_addr)); |
| 161 | else |
| 162 | range->max_addr = range->min_addr; |
| 163 | |
| 164 | return 0; |
| 165 | } |
Duan Jiong | 24de3d3 | 2014-06-30 09:19:32 +0800 | [diff] [blame] | 166 | #endif |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 167 | |
| 168 | static const struct nf_nat_l3proto nf_nat_l3proto_ipv6 = { |
| 169 | .l3proto = NFPROTO_IPV6, |
| 170 | .secure_port = nf_nat_ipv6_secure_port, |
| 171 | .in_range = nf_nat_ipv6_in_range, |
| 172 | .manip_pkt = nf_nat_ipv6_manip_pkt, |
| 173 | .csum_update = nf_nat_ipv6_csum_update, |
| 174 | .csum_recalc = nf_nat_ipv6_csum_recalc, |
Duan Jiong | 24de3d3 | 2014-06-30 09:19:32 +0800 | [diff] [blame] | 175 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 176 | .nlattr_to_range = nf_nat_ipv6_nlattr_to_range, |
Duan Jiong | 24de3d3 | 2014-06-30 09:19:32 +0800 | [diff] [blame] | 177 | #endif |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 178 | #ifdef CONFIG_XFRM |
| 179 | .decode_session = nf_nat_ipv6_decode_session, |
| 180 | #endif |
| 181 | }; |
| 182 | |
| 183 | int nf_nat_icmpv6_reply_translation(struct sk_buff *skb, |
| 184 | struct nf_conn *ct, |
| 185 | enum ip_conntrack_info ctinfo, |
| 186 | unsigned int hooknum, |
| 187 | unsigned int hdrlen) |
| 188 | { |
| 189 | struct { |
| 190 | struct icmp6hdr icmp6; |
| 191 | struct ipv6hdr ip6; |
| 192 | } *inside; |
| 193 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
| 194 | enum nf_nat_manip_type manip = HOOK2MANIP(hooknum); |
| 195 | const struct nf_nat_l4proto *l4proto; |
| 196 | struct nf_conntrack_tuple target; |
| 197 | unsigned long statusbit; |
| 198 | |
| 199 | NF_CT_ASSERT(ctinfo == IP_CT_RELATED || ctinfo == IP_CT_RELATED_REPLY); |
| 200 | |
| 201 | if (!skb_make_writable(skb, hdrlen + sizeof(*inside))) |
| 202 | return 0; |
| 203 | if (nf_ip6_checksum(skb, hooknum, hdrlen, IPPROTO_ICMPV6)) |
| 204 | return 0; |
| 205 | |
| 206 | inside = (void *)skb->data + hdrlen; |
| 207 | if (inside->icmp6.icmp6_type == NDISC_REDIRECT) { |
| 208 | if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK) |
| 209 | return 0; |
| 210 | if (ct->status & IPS_NAT_MASK) |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | if (manip == NF_NAT_MANIP_SRC) |
| 215 | statusbit = IPS_SRC_NAT; |
| 216 | else |
| 217 | statusbit = IPS_DST_NAT; |
| 218 | |
| 219 | /* Invert if this is reply direction */ |
| 220 | if (dir == IP_CT_DIR_REPLY) |
| 221 | statusbit ^= IPS_NAT_MASK; |
| 222 | |
| 223 | if (!(ct->status & statusbit)) |
| 224 | return 1; |
| 225 | |
| 226 | l4proto = __nf_nat_l4proto_find(NFPROTO_IPV6, inside->ip6.nexthdr); |
| 227 | if (!nf_nat_ipv6_manip_pkt(skb, hdrlen + sizeof(inside->icmp6), |
| 228 | l4proto, &ct->tuplehash[!dir].tuple, !manip)) |
| 229 | return 0; |
| 230 | |
| 231 | if (skb->ip_summed != CHECKSUM_PARTIAL) { |
| 232 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
| 233 | inside = (void *)skb->data + hdrlen; |
| 234 | inside->icmp6.icmp6_cksum = 0; |
| 235 | inside->icmp6.icmp6_cksum = |
| 236 | csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, |
| 237 | skb->len - hdrlen, IPPROTO_ICMPV6, |
| 238 | csum_partial(&inside->icmp6, |
| 239 | skb->len - hdrlen, 0)); |
| 240 | } |
| 241 | |
| 242 | nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple); |
| 243 | l4proto = __nf_nat_l4proto_find(NFPROTO_IPV6, IPPROTO_ICMPV6); |
| 244 | if (!nf_nat_ipv6_manip_pkt(skb, 0, l4proto, &target, manip)) |
| 245 | return 0; |
| 246 | |
| 247 | return 1; |
| 248 | } |
| 249 | EXPORT_SYMBOL_GPL(nf_nat_icmpv6_reply_translation); |
| 250 | |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 251 | unsigned int |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 252 | nf_nat_ipv6_fn(void *priv, struct sk_buff *skb, |
David S. Miller | 8fe2238 | 2015-04-03 21:05:07 -0400 | [diff] [blame] | 253 | const struct nf_hook_state *state, |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 254 | unsigned int (*do_chain)(void *priv, |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 255 | struct sk_buff *skb, |
David S. Miller | 8fe2238 | 2015-04-03 21:05:07 -0400 | [diff] [blame] | 256 | const struct nf_hook_state *state, |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 257 | struct nf_conn *ct)) |
| 258 | { |
| 259 | struct nf_conn *ct; |
| 260 | enum ip_conntrack_info ctinfo; |
| 261 | struct nf_conn_nat *nat; |
Eric W. Biederman | 082a758 | 2015-09-18 14:32:56 -0500 | [diff] [blame] | 262 | enum nf_nat_manip_type maniptype = HOOK2MANIP(state->hook); |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 263 | __be16 frag_off; |
| 264 | int hdrlen; |
| 265 | u8 nexthdr; |
| 266 | |
| 267 | ct = nf_ct_get(skb, &ctinfo); |
| 268 | /* Can't track? It's not due to stress, or conntrack would |
| 269 | * have dropped it. Hence it's the user's responsibilty to |
| 270 | * packet filter it out, or implement conntrack/NAT for that |
| 271 | * protocol. 8) --RR |
| 272 | */ |
| 273 | if (!ct) |
| 274 | return NF_ACCEPT; |
| 275 | |
| 276 | /* Don't try to NAT if this packet is not conntracked */ |
| 277 | if (nf_ct_is_untracked(ct)) |
| 278 | return NF_ACCEPT; |
| 279 | |
| 280 | nat = nf_ct_nat_ext_add(ct); |
| 281 | if (nat == NULL) |
| 282 | return NF_ACCEPT; |
| 283 | |
| 284 | switch (ctinfo) { |
| 285 | case IP_CT_RELATED: |
| 286 | case IP_CT_RELATED_REPLY: |
| 287 | nexthdr = ipv6_hdr(skb)->nexthdr; |
| 288 | hdrlen = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), |
| 289 | &nexthdr, &frag_off); |
| 290 | |
| 291 | if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) { |
| 292 | if (!nf_nat_icmpv6_reply_translation(skb, ct, ctinfo, |
Eric W. Biederman | 082a758 | 2015-09-18 14:32:56 -0500 | [diff] [blame] | 293 | state->hook, |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 294 | hdrlen)) |
| 295 | return NF_DROP; |
| 296 | else |
| 297 | return NF_ACCEPT; |
| 298 | } |
| 299 | /* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */ |
| 300 | case IP_CT_NEW: |
| 301 | /* Seen it before? This can happen for loopback, retrans, |
| 302 | * or local packets. |
| 303 | */ |
| 304 | if (!nf_nat_initialized(ct, maniptype)) { |
| 305 | unsigned int ret; |
| 306 | |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 307 | ret = do_chain(priv, skb, state, ct); |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 308 | if (ret != NF_ACCEPT) |
| 309 | return ret; |
| 310 | |
Eric W. Biederman | 082a758 | 2015-09-18 14:32:56 -0500 | [diff] [blame] | 311 | if (nf_nat_initialized(ct, HOOK2MANIP(state->hook))) |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 312 | break; |
| 313 | |
Eric W. Biederman | 082a758 | 2015-09-18 14:32:56 -0500 | [diff] [blame] | 314 | ret = nf_nat_alloc_null_binding(ct, state->hook); |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 315 | if (ret != NF_ACCEPT) |
| 316 | return ret; |
| 317 | } else { |
| 318 | pr_debug("Already setup manip %s for ct %p\n", |
| 319 | maniptype == NF_NAT_MANIP_SRC ? "SRC" : "DST", |
| 320 | ct); |
Eric W. Biederman | 082a758 | 2015-09-18 14:32:56 -0500 | [diff] [blame] | 321 | if (nf_nat_oif_changed(state->hook, ctinfo, nat, state->out)) |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 322 | goto oif_changed; |
| 323 | } |
| 324 | break; |
| 325 | |
| 326 | default: |
| 327 | /* ESTABLISHED */ |
| 328 | NF_CT_ASSERT(ctinfo == IP_CT_ESTABLISHED || |
| 329 | ctinfo == IP_CT_ESTABLISHED_REPLY); |
Eric W. Biederman | 082a758 | 2015-09-18 14:32:56 -0500 | [diff] [blame] | 330 | if (nf_nat_oif_changed(state->hook, ctinfo, nat, state->out)) |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 331 | goto oif_changed; |
| 332 | } |
| 333 | |
Eric W. Biederman | 082a758 | 2015-09-18 14:32:56 -0500 | [diff] [blame] | 334 | return nf_nat_packet(ct, ctinfo, state->hook, skb); |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 335 | |
| 336 | oif_changed: |
| 337 | nf_ct_kill_acct(ct, ctinfo, skb); |
| 338 | return NF_DROP; |
| 339 | } |
| 340 | EXPORT_SYMBOL_GPL(nf_nat_ipv6_fn); |
| 341 | |
| 342 | unsigned int |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 343 | nf_nat_ipv6_in(void *priv, struct sk_buff *skb, |
David S. Miller | 8fe2238 | 2015-04-03 21:05:07 -0400 | [diff] [blame] | 344 | const struct nf_hook_state *state, |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 345 | unsigned int (*do_chain)(void *priv, |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 346 | struct sk_buff *skb, |
David S. Miller | 8fe2238 | 2015-04-03 21:05:07 -0400 | [diff] [blame] | 347 | const struct nf_hook_state *state, |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 348 | struct nf_conn *ct)) |
| 349 | { |
| 350 | unsigned int ret; |
| 351 | struct in6_addr daddr = ipv6_hdr(skb)->daddr; |
| 352 | |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 353 | ret = nf_nat_ipv6_fn(priv, skb, state, do_chain); |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 354 | if (ret != NF_DROP && ret != NF_STOLEN && |
| 355 | ipv6_addr_cmp(&daddr, &ipv6_hdr(skb)->daddr)) |
| 356 | skb_dst_drop(skb); |
| 357 | |
| 358 | return ret; |
| 359 | } |
| 360 | EXPORT_SYMBOL_GPL(nf_nat_ipv6_in); |
| 361 | |
| 362 | unsigned int |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 363 | nf_nat_ipv6_out(void *priv, struct sk_buff *skb, |
David S. Miller | 8fe2238 | 2015-04-03 21:05:07 -0400 | [diff] [blame] | 364 | const struct nf_hook_state *state, |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 365 | unsigned int (*do_chain)(void *priv, |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 366 | struct sk_buff *skb, |
David S. Miller | 8fe2238 | 2015-04-03 21:05:07 -0400 | [diff] [blame] | 367 | const struct nf_hook_state *state, |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 368 | struct nf_conn *ct)) |
| 369 | { |
| 370 | #ifdef CONFIG_XFRM |
| 371 | const struct nf_conn *ct; |
| 372 | enum ip_conntrack_info ctinfo; |
| 373 | int err; |
| 374 | #endif |
| 375 | unsigned int ret; |
| 376 | |
| 377 | /* root is playing with raw sockets. */ |
| 378 | if (skb->len < sizeof(struct ipv6hdr)) |
| 379 | return NF_ACCEPT; |
| 380 | |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 381 | ret = nf_nat_ipv6_fn(priv, skb, state, do_chain); |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 382 | #ifdef CONFIG_XFRM |
| 383 | if (ret != NF_DROP && ret != NF_STOLEN && |
| 384 | !(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && |
| 385 | (ct = nf_ct_get(skb, &ctinfo)) != NULL) { |
| 386 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
| 387 | |
| 388 | if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3, |
| 389 | &ct->tuplehash[!dir].tuple.dst.u3) || |
| 390 | (ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 && |
| 391 | ct->tuplehash[dir].tuple.src.u.all != |
| 392 | ct->tuplehash[!dir].tuple.dst.u.all)) { |
Eric W. Biederman | c7af648 | 2015-09-18 14:33:07 -0500 | [diff] [blame] | 393 | err = nf_xfrm_me_harder(state->net, skb, AF_INET6); |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 394 | if (err < 0) |
| 395 | ret = NF_DROP_ERR(err); |
| 396 | } |
| 397 | } |
| 398 | #endif |
| 399 | return ret; |
| 400 | } |
| 401 | EXPORT_SYMBOL_GPL(nf_nat_ipv6_out); |
| 402 | |
| 403 | unsigned int |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 404 | nf_nat_ipv6_local_fn(void *priv, struct sk_buff *skb, |
David S. Miller | 8fe2238 | 2015-04-03 21:05:07 -0400 | [diff] [blame] | 405 | const struct nf_hook_state *state, |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 406 | unsigned int (*do_chain)(void *priv, |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 407 | struct sk_buff *skb, |
David S. Miller | 8fe2238 | 2015-04-03 21:05:07 -0400 | [diff] [blame] | 408 | const struct nf_hook_state *state, |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 409 | struct nf_conn *ct)) |
| 410 | { |
| 411 | const struct nf_conn *ct; |
| 412 | enum ip_conntrack_info ctinfo; |
| 413 | unsigned int ret; |
| 414 | int err; |
| 415 | |
| 416 | /* root is playing with raw sockets. */ |
| 417 | if (skb->len < sizeof(struct ipv6hdr)) |
| 418 | return NF_ACCEPT; |
| 419 | |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 420 | ret = nf_nat_ipv6_fn(priv, skb, state, do_chain); |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 421 | if (ret != NF_DROP && ret != NF_STOLEN && |
| 422 | (ct = nf_ct_get(skb, &ctinfo)) != NULL) { |
| 423 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
| 424 | |
| 425 | if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3, |
| 426 | &ct->tuplehash[!dir].tuple.src.u3)) { |
Eric W. Biederman | 5f5d74d | 2015-09-25 15:07:31 -0500 | [diff] [blame] | 427 | err = ip6_route_me_harder(state->net, skb); |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 428 | if (err < 0) |
| 429 | ret = NF_DROP_ERR(err); |
| 430 | } |
| 431 | #ifdef CONFIG_XFRM |
| 432 | else if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) && |
| 433 | ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 && |
| 434 | ct->tuplehash[dir].tuple.dst.u.all != |
| 435 | ct->tuplehash[!dir].tuple.src.u.all) { |
Eric W. Biederman | c7af648 | 2015-09-18 14:33:07 -0500 | [diff] [blame] | 436 | err = nf_xfrm_me_harder(state->net, skb, AF_INET6); |
Pablo Neira Ayuso | 2a5538e | 2014-08-25 12:05:27 +0200 | [diff] [blame] | 437 | if (err < 0) |
| 438 | ret = NF_DROP_ERR(err); |
| 439 | } |
| 440 | #endif |
| 441 | } |
| 442 | return ret; |
| 443 | } |
| 444 | EXPORT_SYMBOL_GPL(nf_nat_ipv6_local_fn); |
| 445 | |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 446 | static int __init nf_nat_l3proto_ipv6_init(void) |
| 447 | { |
| 448 | int err; |
| 449 | |
| 450 | err = nf_nat_l4proto_register(NFPROTO_IPV6, &nf_nat_l4proto_icmpv6); |
| 451 | if (err < 0) |
| 452 | goto err1; |
| 453 | err = nf_nat_l3proto_register(&nf_nat_l3proto_ipv6); |
| 454 | if (err < 0) |
| 455 | goto err2; |
| 456 | return err; |
| 457 | |
| 458 | err2: |
| 459 | nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_icmpv6); |
| 460 | err1: |
| 461 | return err; |
| 462 | } |
| 463 | |
| 464 | static void __exit nf_nat_l3proto_ipv6_exit(void) |
| 465 | { |
| 466 | nf_nat_l3proto_unregister(&nf_nat_l3proto_ipv6); |
| 467 | nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_icmpv6); |
| 468 | } |
| 469 | |
| 470 | MODULE_LICENSE("GPL"); |
| 471 | MODULE_ALIAS("nf-nat-" __stringify(AF_INET6)); |
| 472 | |
| 473 | module_init(nf_nat_l3proto_ipv6_init); |
| 474 | module_exit(nf_nat_l3proto_ipv6_exit); |