KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Transparent proxy support for Linux/iptables |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 BalaBit IT Ltd. |
| 5 | * Author: Krisztian Kovacs |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | */ |
Jan Engelhardt | ff67e4e | 2010-03-19 21:08:16 +0100 | [diff] [blame] | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 13 | #include <linux/module.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/netfilter/x_tables.h> |
| 16 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 17 | #include <net/tcp.h> |
| 18 | #include <net/udp.h> |
| 19 | #include <net/icmp.h> |
| 20 | #include <net/sock.h> |
| 21 | #include <net/inet_sock.h> |
| 22 | #include <net/netfilter/nf_tproxy_core.h> |
| 23 | #include <net/netfilter/ipv4/nf_defrag_ipv4.h> |
KOVACS Krisztian | f6318e5 | 2010-10-24 23:38:32 +0000 | [diff] [blame] | 24 | |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 25 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
KOVACS Krisztian | f6318e5 | 2010-10-24 23:38:32 +0000 | [diff] [blame] | 26 | #define XT_SOCKET_HAVE_IPV6 1 |
| 27 | #include <linux/netfilter_ipv6/ip6_tables.h> |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 28 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> |
KOVACS Krisztian | f6318e5 | 2010-10-24 23:38:32 +0000 | [diff] [blame] | 29 | #endif |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 30 | |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 31 | #include <linux/netfilter/xt_socket.h> |
| 32 | |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 33 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 34 | #define XT_SOCKET_HAVE_CONNTRACK 1 |
| 35 | #include <net/netfilter/nf_conntrack.h> |
| 36 | #endif |
| 37 | |
Florian Westphal | d503b30 | 2011-02-17 11:32:38 +0100 | [diff] [blame] | 38 | static void |
| 39 | xt_socket_put_sk(struct sock *sk) |
| 40 | { |
| 41 | if (sk->sk_state == TCP_TIME_WAIT) |
| 42 | inet_twsk_put(inet_twsk(sk)); |
| 43 | else |
| 44 | sock_put(sk); |
| 45 | } |
| 46 | |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 47 | static int |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 48 | extract_icmp4_fields(const struct sk_buff *skb, |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 49 | u8 *protocol, |
| 50 | __be32 *raddr, |
| 51 | __be32 *laddr, |
| 52 | __be16 *rport, |
| 53 | __be16 *lport) |
| 54 | { |
| 55 | unsigned int outside_hdrlen = ip_hdrlen(skb); |
| 56 | struct iphdr *inside_iph, _inside_iph; |
| 57 | struct icmphdr *icmph, _icmph; |
| 58 | __be16 *ports, _ports[2]; |
| 59 | |
| 60 | icmph = skb_header_pointer(skb, outside_hdrlen, |
| 61 | sizeof(_icmph), &_icmph); |
| 62 | if (icmph == NULL) |
| 63 | return 1; |
| 64 | |
| 65 | switch (icmph->type) { |
| 66 | case ICMP_DEST_UNREACH: |
| 67 | case ICMP_SOURCE_QUENCH: |
| 68 | case ICMP_REDIRECT: |
| 69 | case ICMP_TIME_EXCEEDED: |
| 70 | case ICMP_PARAMETERPROB: |
| 71 | break; |
| 72 | default: |
| 73 | return 1; |
| 74 | } |
| 75 | |
| 76 | inside_iph = skb_header_pointer(skb, outside_hdrlen + |
| 77 | sizeof(struct icmphdr), |
| 78 | sizeof(_inside_iph), &_inside_iph); |
| 79 | if (inside_iph == NULL) |
| 80 | return 1; |
| 81 | |
| 82 | if (inside_iph->protocol != IPPROTO_TCP && |
| 83 | inside_iph->protocol != IPPROTO_UDP) |
| 84 | return 1; |
| 85 | |
| 86 | ports = skb_header_pointer(skb, outside_hdrlen + |
| 87 | sizeof(struct icmphdr) + |
| 88 | (inside_iph->ihl << 2), |
| 89 | sizeof(_ports), &_ports); |
| 90 | if (ports == NULL) |
| 91 | return 1; |
| 92 | |
| 93 | /* the inside IP packet is the one quoted from our side, thus |
| 94 | * its saddr is the local address */ |
| 95 | *protocol = inside_iph->protocol; |
| 96 | *laddr = inside_iph->saddr; |
| 97 | *lport = ports[0]; |
| 98 | *raddr = inside_iph->daddr; |
| 99 | *rport = ports[1]; |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 104 | static bool |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 105 | socket_match(const struct sk_buff *skb, struct xt_action_param *par, |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 106 | const struct xt_socket_mtinfo1 *info) |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 107 | { |
| 108 | const struct iphdr *iph = ip_hdr(skb); |
| 109 | struct udphdr _hdr, *hp = NULL; |
Eric Dumazet | 00028aa | 2013-05-22 11:01:06 +0000 | [diff] [blame] | 110 | struct sock *sk = skb->sk; |
Pablo Neira Ayuso | 6703aa7 | 2012-08-29 15:58:29 +0000 | [diff] [blame] | 111 | __be32 uninitialized_var(daddr), uninitialized_var(saddr); |
| 112 | __be16 uninitialized_var(dport), uninitialized_var(sport); |
| 113 | u8 uninitialized_var(protocol); |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 114 | #ifdef XT_SOCKET_HAVE_CONNTRACK |
| 115 | struct nf_conn const *ct; |
| 116 | enum ip_conntrack_info ctinfo; |
| 117 | #endif |
| 118 | |
| 119 | if (iph->protocol == IPPROTO_UDP || iph->protocol == IPPROTO_TCP) { |
| 120 | hp = skb_header_pointer(skb, ip_hdrlen(skb), |
| 121 | sizeof(_hdr), &_hdr); |
| 122 | if (hp == NULL) |
| 123 | return false; |
| 124 | |
| 125 | protocol = iph->protocol; |
| 126 | saddr = iph->saddr; |
| 127 | sport = hp->source; |
| 128 | daddr = iph->daddr; |
| 129 | dport = hp->dest; |
| 130 | |
| 131 | } else if (iph->protocol == IPPROTO_ICMP) { |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 132 | if (extract_icmp4_fields(skb, &protocol, &saddr, &daddr, |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 133 | &sport, &dport)) |
| 134 | return false; |
| 135 | } else { |
| 136 | return false; |
| 137 | } |
| 138 | |
| 139 | #ifdef XT_SOCKET_HAVE_CONNTRACK |
| 140 | /* Do the lookup with the original socket address in case this is a |
| 141 | * reply packet of an established SNAT-ted connection. */ |
| 142 | |
| 143 | ct = nf_ct_get(skb, &ctinfo); |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 144 | if (ct && !nf_ct_is_untracked(ct) && |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 145 | ((iph->protocol != IPPROTO_ICMP && |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 146 | ctinfo == IP_CT_ESTABLISHED_REPLY) || |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 147 | (iph->protocol == IPPROTO_ICMP && |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 148 | ctinfo == IP_CT_RELATED_REPLY)) && |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 149 | (ct->status & IPS_SRC_NAT_DONE)) { |
| 150 | |
| 151 | daddr = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip; |
| 152 | dport = (iph->protocol == IPPROTO_TCP) ? |
| 153 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.tcp.port : |
| 154 | ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port; |
| 155 | } |
| 156 | #endif |
| 157 | |
Eric Dumazet | 00028aa | 2013-05-22 11:01:06 +0000 | [diff] [blame] | 158 | if (!sk) |
| 159 | sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), protocol, |
| 160 | saddr, daddr, sport, dport, |
| 161 | par->in, NFT_LOOKUP_ANY); |
| 162 | if (sk) { |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 163 | bool wildcard; |
| 164 | bool transparent = true; |
| 165 | |
Eric Dumazet | 681f130 | 2013-06-20 05:52:22 -0700 | [diff] [blame] | 166 | /* Ignore sockets listening on INADDR_ANY, |
| 167 | * unless XT_SOCKET_NOWILDCARD is set |
| 168 | */ |
| 169 | wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) && |
| 170 | sk->sk_state != TCP_TIME_WAIT && |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 171 | inet_sk(sk)->inet_rcv_saddr == 0); |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 172 | |
| 173 | /* Ignore non-transparent sockets, |
| 174 | if XT_SOCKET_TRANSPARENT is used */ |
Eric Dumazet | baf60ef | 2013-07-11 19:22:19 -0700 | [diff] [blame^] | 175 | if (info->flags & XT_SOCKET_TRANSPARENT) |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 176 | transparent = ((sk->sk_state != TCP_TIME_WAIT && |
| 177 | inet_sk(sk)->transparent) || |
| 178 | (sk->sk_state == TCP_TIME_WAIT && |
| 179 | inet_twsk(sk)->tw_transparent)); |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 180 | |
Eric Dumazet | 00028aa | 2013-05-22 11:01:06 +0000 | [diff] [blame] | 181 | if (sk != skb->sk) |
| 182 | xt_socket_put_sk(sk); |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 183 | |
| 184 | if (wildcard || !transparent) |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 185 | sk = NULL; |
| 186 | } |
| 187 | |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 188 | pr_debug("proto %hhu %pI4:%hu -> %pI4:%hu (orig %pI4:%hu) sock %p\n", |
| 189 | protocol, &saddr, ntohs(sport), |
| 190 | &daddr, ntohs(dport), |
| 191 | &iph->daddr, hp ? ntohs(hp->dest) : 0, sk); |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 192 | |
| 193 | return (sk != NULL); |
| 194 | } |
| 195 | |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 196 | static bool |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 197 | socket_mt4_v0(const struct sk_buff *skb, struct xt_action_param *par) |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 198 | { |
Eric Dumazet | baf60ef | 2013-07-11 19:22:19 -0700 | [diff] [blame^] | 199 | static struct xt_socket_mtinfo1 xt_info_v0 = { |
| 200 | .flags = 0, |
| 201 | }; |
| 202 | |
| 203 | return socket_match(skb, par, &xt_info_v0); |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | static bool |
Eric Dumazet | 681f130 | 2013-06-20 05:52:22 -0700 | [diff] [blame] | 207 | socket_mt4_v1_v2(const struct sk_buff *skb, struct xt_action_param *par) |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 208 | { |
| 209 | return socket_match(skb, par, par->matchinfo); |
| 210 | } |
| 211 | |
KOVACS Krisztian | f6318e5 | 2010-10-24 23:38:32 +0000 | [diff] [blame] | 212 | #ifdef XT_SOCKET_HAVE_IPV6 |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 213 | |
| 214 | static int |
| 215 | extract_icmp6_fields(const struct sk_buff *skb, |
| 216 | unsigned int outside_hdrlen, |
David S. Miller | 089282f | 2010-10-28 12:59:53 -0700 | [diff] [blame] | 217 | int *protocol, |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 218 | struct in6_addr **raddr, |
| 219 | struct in6_addr **laddr, |
| 220 | __be16 *rport, |
| 221 | __be16 *lport) |
| 222 | { |
| 223 | struct ipv6hdr *inside_iph, _inside_iph; |
| 224 | struct icmp6hdr *icmph, _icmph; |
| 225 | __be16 *ports, _ports[2]; |
| 226 | u8 inside_nexthdr; |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 227 | __be16 inside_fragoff; |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 228 | int inside_hdrlen; |
| 229 | |
| 230 | icmph = skb_header_pointer(skb, outside_hdrlen, |
| 231 | sizeof(_icmph), &_icmph); |
| 232 | if (icmph == NULL) |
| 233 | return 1; |
| 234 | |
| 235 | if (icmph->icmp6_type & ICMPV6_INFOMSG_MASK) |
| 236 | return 1; |
| 237 | |
| 238 | inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph), sizeof(_inside_iph), &_inside_iph); |
| 239 | if (inside_iph == NULL) |
| 240 | return 1; |
| 241 | inside_nexthdr = inside_iph->nexthdr; |
| 242 | |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 243 | inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) + sizeof(_inside_iph), |
| 244 | &inside_nexthdr, &inside_fragoff); |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 245 | if (inside_hdrlen < 0) |
| 246 | return 1; /* hjm: Packet has no/incomplete transport layer headers. */ |
| 247 | |
| 248 | if (inside_nexthdr != IPPROTO_TCP && |
| 249 | inside_nexthdr != IPPROTO_UDP) |
| 250 | return 1; |
| 251 | |
| 252 | ports = skb_header_pointer(skb, inside_hdrlen, |
| 253 | sizeof(_ports), &_ports); |
| 254 | if (ports == NULL) |
| 255 | return 1; |
| 256 | |
| 257 | /* the inside IP packet is the one quoted from our side, thus |
| 258 | * its saddr is the local address */ |
| 259 | *protocol = inside_nexthdr; |
| 260 | *laddr = &inside_iph->saddr; |
| 261 | *lport = ports[0]; |
| 262 | *raddr = &inside_iph->daddr; |
| 263 | *rport = ports[1]; |
| 264 | |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | static bool |
Eric Dumazet | 681f130 | 2013-06-20 05:52:22 -0700 | [diff] [blame] | 269 | socket_mt6_v1_v2(const struct sk_buff *skb, struct xt_action_param *par) |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 270 | { |
| 271 | struct ipv6hdr *iph = ipv6_hdr(skb); |
| 272 | struct udphdr _hdr, *hp = NULL; |
Eric Dumazet | 00028aa | 2013-05-22 11:01:06 +0000 | [diff] [blame] | 273 | struct sock *sk = skb->sk; |
Pablo Neira Ayuso | 6703aa7 | 2012-08-29 15:58:29 +0000 | [diff] [blame] | 274 | struct in6_addr *daddr = NULL, *saddr = NULL; |
| 275 | __be16 uninitialized_var(dport), uninitialized_var(sport); |
| 276 | int thoff = 0, uninitialized_var(tproto); |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 277 | const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo; |
| 278 | |
Hans Schillstrom | 84018f5 | 2012-04-23 03:35:26 +0000 | [diff] [blame] | 279 | tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL); |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 280 | if (tproto < 0) { |
| 281 | pr_debug("unable to find transport header in IPv6 packet, dropping\n"); |
| 282 | return NF_DROP; |
| 283 | } |
| 284 | |
| 285 | if (tproto == IPPROTO_UDP || tproto == IPPROTO_TCP) { |
| 286 | hp = skb_header_pointer(skb, thoff, |
| 287 | sizeof(_hdr), &_hdr); |
| 288 | if (hp == NULL) |
| 289 | return false; |
| 290 | |
| 291 | saddr = &iph->saddr; |
| 292 | sport = hp->source; |
| 293 | daddr = &iph->daddr; |
| 294 | dport = hp->dest; |
| 295 | |
| 296 | } else if (tproto == IPPROTO_ICMPV6) { |
| 297 | if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr, |
| 298 | &sport, &dport)) |
| 299 | return false; |
| 300 | } else { |
| 301 | return false; |
| 302 | } |
| 303 | |
Eric Dumazet | 00028aa | 2013-05-22 11:01:06 +0000 | [diff] [blame] | 304 | if (!sk) |
| 305 | sk = nf_tproxy_get_sock_v6(dev_net(skb->dev), tproto, |
| 306 | saddr, daddr, sport, dport, |
| 307 | par->in, NFT_LOOKUP_ANY); |
| 308 | if (sk) { |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 309 | bool wildcard; |
| 310 | bool transparent = true; |
| 311 | |
Eric Dumazet | 681f130 | 2013-06-20 05:52:22 -0700 | [diff] [blame] | 312 | /* Ignore sockets listening on INADDR_ANY |
| 313 | * unless XT_SOCKET_NOWILDCARD is set |
| 314 | */ |
| 315 | wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) && |
| 316 | sk->sk_state != TCP_TIME_WAIT && |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 317 | ipv6_addr_any(&inet6_sk(sk)->rcv_saddr)); |
| 318 | |
| 319 | /* Ignore non-transparent sockets, |
| 320 | if XT_SOCKET_TRANSPARENT is used */ |
Eric Dumazet | baf60ef | 2013-07-11 19:22:19 -0700 | [diff] [blame^] | 321 | if (info->flags & XT_SOCKET_TRANSPARENT) |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 322 | transparent = ((sk->sk_state != TCP_TIME_WAIT && |
| 323 | inet_sk(sk)->transparent) || |
| 324 | (sk->sk_state == TCP_TIME_WAIT && |
| 325 | inet_twsk(sk)->tw_transparent)); |
| 326 | |
Eric Dumazet | 00028aa | 2013-05-22 11:01:06 +0000 | [diff] [blame] | 327 | if (sk != skb->sk) |
| 328 | xt_socket_put_sk(sk); |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 329 | |
| 330 | if (wildcard || !transparent) |
| 331 | sk = NULL; |
| 332 | } |
| 333 | |
David S. Miller | 089282f | 2010-10-28 12:59:53 -0700 | [diff] [blame] | 334 | pr_debug("proto %hhd %pI6:%hu -> %pI6:%hu " |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 335 | "(orig %pI6:%hu) sock %p\n", |
| 336 | tproto, saddr, ntohs(sport), |
| 337 | daddr, ntohs(dport), |
| 338 | &iph->daddr, hp ? ntohs(hp->dest) : 0, sk); |
| 339 | |
| 340 | return (sk != NULL); |
| 341 | } |
| 342 | #endif |
| 343 | |
Eric Dumazet | 681f130 | 2013-06-20 05:52:22 -0700 | [diff] [blame] | 344 | static int socket_mt_v1_check(const struct xt_mtchk_param *par) |
| 345 | { |
| 346 | const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo; |
| 347 | |
| 348 | if (info->flags & ~XT_SOCKET_FLAGS_V1) { |
| 349 | pr_info("unknown flags 0x%x\n", info->flags & ~XT_SOCKET_FLAGS_V1); |
| 350 | return -EINVAL; |
| 351 | } |
| 352 | return 0; |
| 353 | } |
| 354 | |
| 355 | static int socket_mt_v2_check(const struct xt_mtchk_param *par) |
| 356 | { |
| 357 | const struct xt_socket_mtinfo2 *info = (struct xt_socket_mtinfo2 *) par->matchinfo; |
| 358 | |
| 359 | if (info->flags & ~XT_SOCKET_FLAGS_V2) { |
| 360 | pr_info("unknown flags 0x%x\n", info->flags & ~XT_SOCKET_FLAGS_V2); |
| 361 | return -EINVAL; |
| 362 | } |
| 363 | return 0; |
| 364 | } |
| 365 | |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 366 | static struct xt_match socket_mt_reg[] __read_mostly = { |
| 367 | { |
| 368 | .name = "socket", |
| 369 | .revision = 0, |
| 370 | .family = NFPROTO_IPV4, |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 371 | .match = socket_mt4_v0, |
Jan Engelhardt | aa3c487 | 2009-10-29 15:35:10 +0100 | [diff] [blame] | 372 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
| 373 | (1 << NF_INET_LOCAL_IN), |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 374 | .me = THIS_MODULE, |
| 375 | }, |
| 376 | { |
| 377 | .name = "socket", |
| 378 | .revision = 1, |
| 379 | .family = NFPROTO_IPV4, |
Eric Dumazet | 681f130 | 2013-06-20 05:52:22 -0700 | [diff] [blame] | 380 | .match = socket_mt4_v1_v2, |
| 381 | .checkentry = socket_mt_v1_check, |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 382 | .matchsize = sizeof(struct xt_socket_mtinfo1), |
Jan Engelhardt | aa3c487 | 2009-10-29 15:35:10 +0100 | [diff] [blame] | 383 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
| 384 | (1 << NF_INET_LOCAL_IN), |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 385 | .me = THIS_MODULE, |
| 386 | }, |
KOVACS Krisztian | f6318e5 | 2010-10-24 23:38:32 +0000 | [diff] [blame] | 387 | #ifdef XT_SOCKET_HAVE_IPV6 |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 388 | { |
| 389 | .name = "socket", |
| 390 | .revision = 1, |
| 391 | .family = NFPROTO_IPV6, |
Eric Dumazet | 681f130 | 2013-06-20 05:52:22 -0700 | [diff] [blame] | 392 | .match = socket_mt6_v1_v2, |
| 393 | .checkentry = socket_mt_v1_check, |
| 394 | .matchsize = sizeof(struct xt_socket_mtinfo1), |
| 395 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
| 396 | (1 << NF_INET_LOCAL_IN), |
| 397 | .me = THIS_MODULE, |
| 398 | }, |
| 399 | #endif |
| 400 | { |
| 401 | .name = "socket", |
| 402 | .revision = 2, |
| 403 | .family = NFPROTO_IPV4, |
| 404 | .match = socket_mt4_v1_v2, |
| 405 | .checkentry = socket_mt_v2_check, |
| 406 | .matchsize = sizeof(struct xt_socket_mtinfo1), |
| 407 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
| 408 | (1 << NF_INET_LOCAL_IN), |
| 409 | .me = THIS_MODULE, |
| 410 | }, |
| 411 | #ifdef XT_SOCKET_HAVE_IPV6 |
| 412 | { |
| 413 | .name = "socket", |
| 414 | .revision = 2, |
| 415 | .family = NFPROTO_IPV6, |
| 416 | .match = socket_mt6_v1_v2, |
| 417 | .checkentry = socket_mt_v2_check, |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 418 | .matchsize = sizeof(struct xt_socket_mtinfo1), |
| 419 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
| 420 | (1 << NF_INET_LOCAL_IN), |
| 421 | .me = THIS_MODULE, |
| 422 | }, |
| 423 | #endif |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 424 | }; |
| 425 | |
| 426 | static int __init socket_mt_init(void) |
| 427 | { |
| 428 | nf_defrag_ipv4_enable(); |
KOVACS Krisztian | f6318e5 | 2010-10-24 23:38:32 +0000 | [diff] [blame] | 429 | #ifdef XT_SOCKET_HAVE_IPV6 |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 430 | nf_defrag_ipv6_enable(); |
| 431 | #endif |
| 432 | |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 433 | return xt_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg)); |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 434 | } |
| 435 | |
| 436 | static void __exit socket_mt_exit(void) |
| 437 | { |
Laszlo Attila Toth | a31e1ff | 2009-06-09 15:16:34 +0200 | [diff] [blame] | 438 | xt_unregister_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg)); |
KOVACS Krisztian | 136cdc7 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 439 | } |
| 440 | |
| 441 | module_init(socket_mt_init); |
| 442 | module_exit(socket_mt_exit); |
| 443 | |
| 444 | MODULE_LICENSE("GPL"); |
| 445 | MODULE_AUTHOR("Krisztian Kovacs, Balazs Scheidler"); |
| 446 | MODULE_DESCRIPTION("x_tables socket match module"); |
| 447 | MODULE_ALIAS("ipt_socket"); |
Balazs Scheidler | b64c925 | 2010-10-21 16:19:42 +0200 | [diff] [blame] | 448 | MODULE_ALIAS("ip6t_socket"); |