Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 1 | /* |
| 2 | * xt_conntrack - Netfilter module to match connection tracking |
| 3 | * information. (Superset of Rusty's minimalistic state match.) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 5 | * (C) 2001 Marc Boucher (marc@mbsi.ca). |
| 6 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/skbuff.h> |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 15 | #include <net/ipv6.h> |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 16 | #include <linux/netfilter/x_tables.h> |
| 17 | #include <linux/netfilter/xt_conntrack.h> |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 18 | #include <net/netfilter/nf_conntrack.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | MODULE_LICENSE("GPL"); |
| 21 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); |
Jan Engelhardt | b416499 | 2008-01-31 03:58:24 -0800 | [diff] [blame] | 22 | MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 23 | MODULE_DESCRIPTION("Xtables: connection tracking state match"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 24 | MODULE_ALIAS("ipt_conntrack"); |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 25 | MODULE_ALIAS("ip6t_conntrack"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 27 | static bool |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 28 | conntrack_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 29 | { |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 30 | const struct xt_conntrack_info *sinfo = par->matchinfo; |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 31 | const struct nf_conn *ct; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 32 | enum ip_conntrack_info ctinfo; |
| 33 | unsigned int statebit; |
| 34 | |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 35 | ct = nf_ct_get(skb, &ctinfo); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 36 | |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 37 | #define FWINV(bool, invflg) ((bool) ^ !!(sinfo->invflags & (invflg))) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 38 | |
| 39 | if (ct == &nf_conntrack_untracked) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 40 | statebit = XT_CONNTRACK_STATE_UNTRACKED; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 41 | else if (ct) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 42 | statebit = XT_CONNTRACK_STATE_BIT(ctinfo); |
| 43 | else |
| 44 | statebit = XT_CONNTRACK_STATE_INVALID; |
| 45 | |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 46 | if (sinfo->flags & XT_CONNTRACK_STATE) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 47 | if (ct) { |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 48 | if (test_bit(IPS_SRC_NAT_BIT, &ct->status)) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 49 | statebit |= XT_CONNTRACK_STATE_SNAT; |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 50 | if (test_bit(IPS_DST_NAT_BIT, &ct->status)) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 51 | statebit |= XT_CONNTRACK_STATE_DNAT; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 52 | } |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 53 | if (FWINV((statebit & sinfo->statemask) == 0, |
| 54 | XT_CONNTRACK_STATE)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 55 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 56 | } |
| 57 | |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 58 | if (ct == NULL) { |
| 59 | if (sinfo->flags & ~XT_CONNTRACK_STATE) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 60 | return false; |
| 61 | return true; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 62 | } |
| 63 | |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 64 | if (sinfo->flags & XT_CONNTRACK_PROTO && |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 65 | FWINV(nf_ct_protonum(ct) != |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 66 | sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum, |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 67 | XT_CONNTRACK_PROTO)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 68 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 69 | |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 70 | if (sinfo->flags & XT_CONNTRACK_ORIGSRC && |
| 71 | FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip & |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 72 | sinfo->sipmsk[IP_CT_DIR_ORIGINAL].s_addr) != |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 73 | sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip, |
| 74 | XT_CONNTRACK_ORIGSRC)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 75 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 76 | |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 77 | if (sinfo->flags & XT_CONNTRACK_ORIGDST && |
| 78 | FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.ip & |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 79 | sinfo->dipmsk[IP_CT_DIR_ORIGINAL].s_addr) != |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 80 | sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip, |
| 81 | XT_CONNTRACK_ORIGDST)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 82 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 83 | |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 84 | if (sinfo->flags & XT_CONNTRACK_REPLSRC && |
| 85 | FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip & |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 86 | sinfo->sipmsk[IP_CT_DIR_REPLY].s_addr) != |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 87 | sinfo->tuple[IP_CT_DIR_REPLY].src.ip, |
| 88 | XT_CONNTRACK_REPLSRC)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 89 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 90 | |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 91 | if (sinfo->flags & XT_CONNTRACK_REPLDST && |
| 92 | FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip & |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 93 | sinfo->dipmsk[IP_CT_DIR_REPLY].s_addr) != |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 94 | sinfo->tuple[IP_CT_DIR_REPLY].dst.ip, |
| 95 | XT_CONNTRACK_REPLDST)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 96 | return false; |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 97 | |
| 98 | if (sinfo->flags & XT_CONNTRACK_STATUS && |
| 99 | FWINV((ct->status & sinfo->statusmask) == 0, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 100 | XT_CONNTRACK_STATUS)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 101 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 102 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 103 | if(sinfo->flags & XT_CONNTRACK_EXPIRES) { |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 104 | unsigned long expires = timer_pending(&ct->timeout) ? |
| 105 | (ct->timeout.expires - jiffies)/HZ : 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 106 | |
Patrick McHardy | 50b9f1d | 2006-09-20 11:58:17 -0700 | [diff] [blame] | 107 | if (FWINV(!(expires >= sinfo->expires_min && |
| 108 | expires <= sinfo->expires_max), |
| 109 | XT_CONNTRACK_EXPIRES)) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 110 | return false; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 111 | } |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 112 | return true; |
Jan Engelhardt | e79ec50 | 2007-12-17 22:44:06 -0800 | [diff] [blame] | 113 | #undef FWINV |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 114 | } |
| 115 | |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 116 | static bool |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 117 | conntrack_addrcmp(const union nf_inet_addr *kaddr, |
| 118 | const union nf_inet_addr *uaddr, |
| 119 | const union nf_inet_addr *umask, unsigned int l3proto) |
| 120 | { |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 121 | if (l3proto == NFPROTO_IPV4) |
Jan Engelhardt | 6556874 | 2008-02-27 12:20:41 -0800 | [diff] [blame] | 122 | return ((kaddr->ip ^ uaddr->ip) & umask->ip) == 0; |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 123 | else if (l3proto == NFPROTO_IPV6) |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 124 | return ipv6_masked_addr_cmp(&kaddr->in6, &umask->in6, |
| 125 | &uaddr->in6) == 0; |
| 126 | else |
| 127 | return false; |
| 128 | } |
| 129 | |
| 130 | static inline bool |
| 131 | conntrack_mt_origsrc(const struct nf_conn *ct, |
| 132 | const struct xt_conntrack_mtinfo1 *info, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 133 | u_int8_t family) |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 134 | { |
| 135 | return conntrack_addrcmp(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3, |
| 136 | &info->origsrc_addr, &info->origsrc_mask, family); |
| 137 | } |
| 138 | |
| 139 | static inline bool |
| 140 | conntrack_mt_origdst(const struct nf_conn *ct, |
| 141 | const struct xt_conntrack_mtinfo1 *info, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 142 | u_int8_t family) |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 143 | { |
| 144 | return conntrack_addrcmp(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3, |
| 145 | &info->origdst_addr, &info->origdst_mask, family); |
| 146 | } |
| 147 | |
| 148 | static inline bool |
| 149 | conntrack_mt_replsrc(const struct nf_conn *ct, |
| 150 | const struct xt_conntrack_mtinfo1 *info, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 151 | u_int8_t family) |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 152 | { |
| 153 | return conntrack_addrcmp(&ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3, |
| 154 | &info->replsrc_addr, &info->replsrc_mask, family); |
| 155 | } |
| 156 | |
| 157 | static inline bool |
| 158 | conntrack_mt_repldst(const struct nf_conn *ct, |
| 159 | const struct xt_conntrack_mtinfo1 *info, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 160 | u_int8_t family) |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 161 | { |
| 162 | return conntrack_addrcmp(&ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3, |
| 163 | &info->repldst_addr, &info->repldst_mask, family); |
| 164 | } |
| 165 | |
Jan Engelhardt | b416499 | 2008-01-31 03:58:24 -0800 | [diff] [blame] | 166 | static inline bool |
| 167 | ct_proto_port_check(const struct xt_conntrack_mtinfo1 *info, |
| 168 | const struct nf_conn *ct) |
| 169 | { |
| 170 | const struct nf_conntrack_tuple *tuple; |
| 171 | |
| 172 | tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; |
| 173 | if ((info->match_flags & XT_CONNTRACK_PROTO) && |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 174 | (nf_ct_protonum(ct) == info->l4proto) ^ |
Jan Engelhardt | b416499 | 2008-01-31 03:58:24 -0800 | [diff] [blame] | 175 | !(info->invert_flags & XT_CONNTRACK_PROTO)) |
| 176 | return false; |
| 177 | |
| 178 | /* Shortcut to match all recognized protocols by using ->src.all. */ |
| 179 | if ((info->match_flags & XT_CONNTRACK_ORIGSRC_PORT) && |
| 180 | (tuple->src.u.all == info->origsrc_port) ^ |
| 181 | !(info->invert_flags & XT_CONNTRACK_ORIGSRC_PORT)) |
| 182 | return false; |
| 183 | |
| 184 | if ((info->match_flags & XT_CONNTRACK_ORIGDST_PORT) && |
| 185 | (tuple->dst.u.all == info->origdst_port) ^ |
| 186 | !(info->invert_flags & XT_CONNTRACK_ORIGDST_PORT)) |
| 187 | return false; |
| 188 | |
| 189 | tuple = &ct->tuplehash[IP_CT_DIR_REPLY].tuple; |
| 190 | |
| 191 | if ((info->match_flags & XT_CONNTRACK_REPLSRC_PORT) && |
| 192 | (tuple->src.u.all == info->replsrc_port) ^ |
| 193 | !(info->invert_flags & XT_CONNTRACK_REPLSRC_PORT)) |
| 194 | return false; |
| 195 | |
| 196 | if ((info->match_flags & XT_CONNTRACK_REPLDST_PORT) && |
| 197 | (tuple->dst.u.all == info->repldst_port) ^ |
| 198 | !(info->invert_flags & XT_CONNTRACK_REPLDST_PORT)) |
| 199 | return false; |
| 200 | |
| 201 | return true; |
| 202 | } |
| 203 | |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 204 | static bool |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 205 | conntrack_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 206 | { |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 207 | const struct xt_conntrack_mtinfo1 *info = par->matchinfo; |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 208 | enum ip_conntrack_info ctinfo; |
| 209 | const struct nf_conn *ct; |
| 210 | unsigned int statebit; |
| 211 | |
| 212 | ct = nf_ct_get(skb, &ctinfo); |
| 213 | |
| 214 | if (ct == &nf_conntrack_untracked) |
| 215 | statebit = XT_CONNTRACK_STATE_UNTRACKED; |
| 216 | else if (ct != NULL) |
| 217 | statebit = XT_CONNTRACK_STATE_BIT(ctinfo); |
| 218 | else |
| 219 | statebit = XT_CONNTRACK_STATE_INVALID; |
| 220 | |
| 221 | if (info->match_flags & XT_CONNTRACK_STATE) { |
| 222 | if (ct != NULL) { |
| 223 | if (test_bit(IPS_SRC_NAT_BIT, &ct->status)) |
| 224 | statebit |= XT_CONNTRACK_STATE_SNAT; |
| 225 | if (test_bit(IPS_DST_NAT_BIT, &ct->status)) |
| 226 | statebit |= XT_CONNTRACK_STATE_DNAT; |
| 227 | } |
Jan Engelhardt | d61f89e | 2008-02-27 12:09:05 -0800 | [diff] [blame] | 228 | if (!!(info->state_mask & statebit) ^ |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 229 | !(info->invert_flags & XT_CONNTRACK_STATE)) |
| 230 | return false; |
| 231 | } |
| 232 | |
| 233 | if (ct == NULL) |
| 234 | return info->match_flags & XT_CONNTRACK_STATE; |
Jan Engelhardt | b416499 | 2008-01-31 03:58:24 -0800 | [diff] [blame] | 235 | if ((info->match_flags & XT_CONNTRACK_DIRECTION) && |
| 236 | (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) ^ |
| 237 | !!(info->invert_flags & XT_CONNTRACK_DIRECTION)) |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 238 | return false; |
| 239 | |
| 240 | if (info->match_flags & XT_CONNTRACK_ORIGSRC) |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 241 | if (conntrack_mt_origsrc(ct, info, par->family) ^ |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 242 | !(info->invert_flags & XT_CONNTRACK_ORIGSRC)) |
| 243 | return false; |
| 244 | |
| 245 | if (info->match_flags & XT_CONNTRACK_ORIGDST) |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 246 | if (conntrack_mt_origdst(ct, info, par->family) ^ |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 247 | !(info->invert_flags & XT_CONNTRACK_ORIGDST)) |
| 248 | return false; |
| 249 | |
| 250 | if (info->match_flags & XT_CONNTRACK_REPLSRC) |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 251 | if (conntrack_mt_replsrc(ct, info, par->family) ^ |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 252 | !(info->invert_flags & XT_CONNTRACK_REPLSRC)) |
| 253 | return false; |
| 254 | |
| 255 | if (info->match_flags & XT_CONNTRACK_REPLDST) |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 256 | if (conntrack_mt_repldst(ct, info, par->family) ^ |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 257 | !(info->invert_flags & XT_CONNTRACK_REPLDST)) |
| 258 | return false; |
| 259 | |
Jan Engelhardt | b416499 | 2008-01-31 03:58:24 -0800 | [diff] [blame] | 260 | if (!ct_proto_port_check(info, ct)) |
| 261 | return false; |
| 262 | |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 263 | if ((info->match_flags & XT_CONNTRACK_STATUS) && |
| 264 | (!!(info->status_mask & ct->status) ^ |
| 265 | !(info->invert_flags & XT_CONNTRACK_STATUS))) |
| 266 | return false; |
| 267 | |
| 268 | if (info->match_flags & XT_CONNTRACK_EXPIRES) { |
| 269 | unsigned long expires = 0; |
| 270 | |
| 271 | if (timer_pending(&ct->timeout)) |
| 272 | expires = (ct->timeout.expires - jiffies) / HZ; |
| 273 | if ((expires >= info->expires_min && |
| 274 | expires <= info->expires_max) ^ |
| 275 | !(info->invert_flags & XT_CONNTRACK_EXPIRES)) |
| 276 | return false; |
| 277 | } |
| 278 | return true; |
| 279 | } |
| 280 | |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 281 | static bool conntrack_mt_check(const struct xt_mtchk_param *par) |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 282 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 283 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
Yasuyuki Kozakai | fe0b929 | 2006-12-12 00:28:40 -0800 | [diff] [blame] | 284 | printk(KERN_WARNING "can't load conntrack support for " |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 285 | "proto=%u\n", par->family); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 286 | return false; |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 287 | } |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 288 | return true; |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 289 | } |
| 290 | |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 291 | static void conntrack_mt_destroy(const struct xt_mtdtor_param *par) |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 292 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 293 | nf_ct_l3proto_module_put(par->family); |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 294 | } |
| 295 | |
Patrick McHardy | da0dd23 | 2007-05-10 14:17:58 -0700 | [diff] [blame] | 296 | #ifdef CONFIG_COMPAT |
| 297 | struct compat_xt_conntrack_info |
| 298 | { |
| 299 | compat_uint_t statemask; |
| 300 | compat_uint_t statusmask; |
| 301 | struct ip_conntrack_old_tuple tuple[IP_CT_DIR_MAX]; |
| 302 | struct in_addr sipmsk[IP_CT_DIR_MAX]; |
| 303 | struct in_addr dipmsk[IP_CT_DIR_MAX]; |
| 304 | compat_ulong_t expires_min; |
| 305 | compat_ulong_t expires_max; |
| 306 | u_int8_t flags; |
| 307 | u_int8_t invflags; |
| 308 | }; |
| 309 | |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 310 | static void conntrack_mt_compat_from_user_v0(void *dst, void *src) |
Patrick McHardy | da0dd23 | 2007-05-10 14:17:58 -0700 | [diff] [blame] | 311 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 312 | const struct compat_xt_conntrack_info *cm = src; |
Patrick McHardy | da0dd23 | 2007-05-10 14:17:58 -0700 | [diff] [blame] | 313 | struct xt_conntrack_info m = { |
| 314 | .statemask = cm->statemask, |
| 315 | .statusmask = cm->statusmask, |
| 316 | .expires_min = cm->expires_min, |
| 317 | .expires_max = cm->expires_max, |
| 318 | .flags = cm->flags, |
| 319 | .invflags = cm->invflags, |
| 320 | }; |
| 321 | memcpy(m.tuple, cm->tuple, sizeof(m.tuple)); |
| 322 | memcpy(m.sipmsk, cm->sipmsk, sizeof(m.sipmsk)); |
| 323 | memcpy(m.dipmsk, cm->dipmsk, sizeof(m.dipmsk)); |
| 324 | memcpy(dst, &m, sizeof(m)); |
| 325 | } |
| 326 | |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 327 | static int conntrack_mt_compat_to_user_v0(void __user *dst, void *src) |
Patrick McHardy | da0dd23 | 2007-05-10 14:17:58 -0700 | [diff] [blame] | 328 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 329 | const struct xt_conntrack_info *m = src; |
Patrick McHardy | da0dd23 | 2007-05-10 14:17:58 -0700 | [diff] [blame] | 330 | struct compat_xt_conntrack_info cm = { |
| 331 | .statemask = m->statemask, |
| 332 | .statusmask = m->statusmask, |
| 333 | .expires_min = m->expires_min, |
| 334 | .expires_max = m->expires_max, |
| 335 | .flags = m->flags, |
| 336 | .invflags = m->invflags, |
| 337 | }; |
| 338 | memcpy(cm.tuple, m->tuple, sizeof(cm.tuple)); |
| 339 | memcpy(cm.sipmsk, m->sipmsk, sizeof(cm.sipmsk)); |
| 340 | memcpy(cm.dipmsk, m->dipmsk, sizeof(cm.dipmsk)); |
| 341 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; |
| 342 | } |
| 343 | #endif |
| 344 | |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 345 | static struct xt_match conntrack_mt_reg[] __read_mostly = { |
| 346 | { |
| 347 | .name = "conntrack", |
| 348 | .revision = 0, |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 349 | .family = NFPROTO_IPV4, |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 350 | .match = conntrack_mt_v0, |
| 351 | .checkentry = conntrack_mt_check, |
| 352 | .destroy = conntrack_mt_destroy, |
| 353 | .matchsize = sizeof(struct xt_conntrack_info), |
| 354 | .me = THIS_MODULE, |
Patrick McHardy | da0dd23 | 2007-05-10 14:17:58 -0700 | [diff] [blame] | 355 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 356 | .compatsize = sizeof(struct compat_xt_conntrack_info), |
| 357 | .compat_from_user = conntrack_mt_compat_from_user_v0, |
| 358 | .compat_to_user = conntrack_mt_compat_to_user_v0, |
Patrick McHardy | da0dd23 | 2007-05-10 14:17:58 -0700 | [diff] [blame] | 359 | #endif |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 360 | }, |
| 361 | { |
| 362 | .name = "conntrack", |
| 363 | .revision = 1, |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 364 | .family = NFPROTO_UNSPEC, |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 365 | .matchsize = sizeof(struct xt_conntrack_mtinfo1), |
| 366 | .match = conntrack_mt, |
| 367 | .checkentry = conntrack_mt_check, |
| 368 | .destroy = conntrack_mt_destroy, |
| 369 | .me = THIS_MODULE, |
| 370 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | }; |
| 372 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 373 | static int __init conntrack_mt_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | { |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 375 | return xt_register_matches(conntrack_mt_reg, |
| 376 | ARRAY_SIZE(conntrack_mt_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |
| 378 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 379 | static void __exit conntrack_mt_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | { |
Jan Engelhardt | 64eb12f | 2008-01-14 23:40:53 -0800 | [diff] [blame] | 381 | xt_unregister_matches(conntrack_mt_reg, ARRAY_SIZE(conntrack_mt_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | } |
| 383 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 384 | module_init(conntrack_mt_init); |
| 385 | module_exit(conntrack_mt_exit); |