Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1 | /* (C) 1999-2001 Paul `Rusty' Russell |
| 2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| 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 | * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>: |
| 9 | * - Real stateful connection tracking |
| 10 | * - Modified state transitions table |
| 11 | * - Window scaling support added |
| 12 | * - SACK support added |
| 13 | * |
| 14 | * Willy Tarreau: |
| 15 | * - State table bugfixes |
| 16 | * - More robust state changes |
| 17 | * - Tuning timer parameters |
| 18 | * |
| 19 | * 27 Oct 2004: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> |
| 20 | * - genelized Layer 3 protocol part. |
| 21 | * |
| 22 | * Derived from net/ipv4/netfilter/ip_conntrack_proto_tcp.c |
| 23 | * |
| 24 | * version 2.2 |
| 25 | */ |
| 26 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 27 | #include <linux/types.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 28 | #include <linux/timer.h> |
| 29 | #include <linux/netfilter.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/in.h> |
| 32 | #include <linux/tcp.h> |
| 33 | #include <linux/spinlock.h> |
| 34 | #include <linux/skbuff.h> |
| 35 | #include <linux/ipv6.h> |
| 36 | #include <net/ip6_checksum.h> |
| 37 | |
| 38 | #include <net/tcp.h> |
| 39 | |
| 40 | #include <linux/netfilter.h> |
| 41 | #include <linux/netfilter_ipv4.h> |
| 42 | #include <linux/netfilter_ipv6.h> |
| 43 | #include <net/netfilter/nf_conntrack.h> |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 44 | #include <net/netfilter/nf_conntrack_l4proto.h> |
Martin Josefsson | f618012 | 2006-11-29 02:35:01 +0100 | [diff] [blame] | 45 | #include <net/netfilter/nf_conntrack_ecache.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 46 | |
| 47 | #if 0 |
| 48 | #define DEBUGP printk |
| 49 | #define DEBUGP_VARS |
| 50 | #else |
| 51 | #define DEBUGP(format, args...) |
| 52 | #endif |
| 53 | |
| 54 | /* Protects conntrack->proto.tcp */ |
| 55 | static DEFINE_RWLOCK(tcp_lock); |
| 56 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 57 | /* "Be conservative in what you do, |
| 58 | be liberal in what you accept from others." |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 59 | If it's non-zero, we mark only out of window RST segments as INVALID. */ |
Patrick McHardy | 3aef0fd | 2007-02-12 11:16:58 -0800 | [diff] [blame] | 60 | static int nf_ct_tcp_be_liberal __read_mostly = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 61 | |
Patrick McHardy | a09113c | 2007-02-07 15:05:33 -0800 | [diff] [blame] | 62 | /* If it is set to zero, we disable picking up already established |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 63 | connections. */ |
Patrick McHardy | 3aef0fd | 2007-02-12 11:16:58 -0800 | [diff] [blame] | 64 | static int nf_ct_tcp_loose __read_mostly = 1; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 65 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 66 | /* Max number of the retransmitted packets without receiving an (acceptable) |
| 67 | ACK from the destination. If this number is reached, a shorter timer |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 68 | will be started. */ |
Patrick McHardy | 3aef0fd | 2007-02-12 11:16:58 -0800 | [diff] [blame] | 69 | static int nf_ct_tcp_max_retrans __read_mostly = 3; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 70 | |
| 71 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more |
| 72 | closely. They're more complex. --RR */ |
| 73 | |
| 74 | static const char *tcp_conntrack_names[] = { |
| 75 | "NONE", |
| 76 | "SYN_SENT", |
| 77 | "SYN_RECV", |
| 78 | "ESTABLISHED", |
| 79 | "FIN_WAIT", |
| 80 | "CLOSE_WAIT", |
| 81 | "LAST_ACK", |
| 82 | "TIME_WAIT", |
| 83 | "CLOSE", |
| 84 | "LISTEN" |
| 85 | }; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 86 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 87 | #define SECS * HZ |
| 88 | #define MINS * 60 SECS |
| 89 | #define HOURS * 60 MINS |
| 90 | #define DAYS * 24 HOURS |
| 91 | |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 92 | static unsigned int nf_ct_tcp_timeout_syn_sent __read_mostly = 2 MINS; |
| 93 | static unsigned int nf_ct_tcp_timeout_syn_recv __read_mostly = 60 SECS; |
| 94 | static unsigned int nf_ct_tcp_timeout_established __read_mostly = 5 DAYS; |
| 95 | static unsigned int nf_ct_tcp_timeout_fin_wait __read_mostly = 2 MINS; |
| 96 | static unsigned int nf_ct_tcp_timeout_close_wait __read_mostly = 60 SECS; |
| 97 | static unsigned int nf_ct_tcp_timeout_last_ack __read_mostly = 30 SECS; |
| 98 | static unsigned int nf_ct_tcp_timeout_time_wait __read_mostly = 2 MINS; |
| 99 | static unsigned int nf_ct_tcp_timeout_close __read_mostly = 10 SECS; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 100 | |
| 101 | /* RFC1122 says the R2 limit should be at least 100 seconds. |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 102 | Linux uses 15 packets as limit, which corresponds |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 103 | to ~13-30min depending on RTO. */ |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 104 | static unsigned int nf_ct_tcp_timeout_max_retrans __read_mostly = 5 MINS; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 105 | |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 106 | static unsigned int * tcp_timeouts[] = { |
| 107 | NULL, /* TCP_CONNTRACK_NONE */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 108 | &nf_ct_tcp_timeout_syn_sent, /* TCP_CONNTRACK_SYN_SENT, */ |
| 109 | &nf_ct_tcp_timeout_syn_recv, /* TCP_CONNTRACK_SYN_RECV, */ |
| 110 | &nf_ct_tcp_timeout_established, /* TCP_CONNTRACK_ESTABLISHED, */ |
| 111 | &nf_ct_tcp_timeout_fin_wait, /* TCP_CONNTRACK_FIN_WAIT, */ |
| 112 | &nf_ct_tcp_timeout_close_wait, /* TCP_CONNTRACK_CLOSE_WAIT, */ |
| 113 | &nf_ct_tcp_timeout_last_ack, /* TCP_CONNTRACK_LAST_ACK, */ |
| 114 | &nf_ct_tcp_timeout_time_wait, /* TCP_CONNTRACK_TIME_WAIT, */ |
| 115 | &nf_ct_tcp_timeout_close, /* TCP_CONNTRACK_CLOSE, */ |
| 116 | NULL, /* TCP_CONNTRACK_LISTEN */ |
| 117 | }; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 118 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 119 | #define sNO TCP_CONNTRACK_NONE |
| 120 | #define sSS TCP_CONNTRACK_SYN_SENT |
| 121 | #define sSR TCP_CONNTRACK_SYN_RECV |
| 122 | #define sES TCP_CONNTRACK_ESTABLISHED |
| 123 | #define sFW TCP_CONNTRACK_FIN_WAIT |
| 124 | #define sCW TCP_CONNTRACK_CLOSE_WAIT |
| 125 | #define sLA TCP_CONNTRACK_LAST_ACK |
| 126 | #define sTW TCP_CONNTRACK_TIME_WAIT |
| 127 | #define sCL TCP_CONNTRACK_CLOSE |
| 128 | #define sLI TCP_CONNTRACK_LISTEN |
| 129 | #define sIV TCP_CONNTRACK_MAX |
| 130 | #define sIG TCP_CONNTRACK_IGNORE |
| 131 | |
| 132 | /* What TCP flags are set from RST/SYN/FIN/ACK. */ |
| 133 | enum tcp_bit_set { |
| 134 | TCP_SYN_SET, |
| 135 | TCP_SYNACK_SET, |
| 136 | TCP_FIN_SET, |
| 137 | TCP_ACK_SET, |
| 138 | TCP_RST_SET, |
| 139 | TCP_NONE_SET, |
| 140 | }; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 141 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 142 | /* |
| 143 | * The TCP state transition table needs a few words... |
| 144 | * |
| 145 | * We are the man in the middle. All the packets go through us |
| 146 | * but might get lost in transit to the destination. |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 147 | * It is assumed that the destinations can't receive segments |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 148 | * we haven't seen. |
| 149 | * |
| 150 | * The checked segment is in window, but our windows are *not* |
| 151 | * equivalent with the ones of the sender/receiver. We always |
| 152 | * try to guess the state of the current sender. |
| 153 | * |
| 154 | * The meaning of the states are: |
| 155 | * |
| 156 | * NONE: initial state |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 157 | * SYN_SENT: SYN-only packet seen |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 158 | * SYN_RECV: SYN-ACK packet seen |
| 159 | * ESTABLISHED: ACK packet seen |
| 160 | * FIN_WAIT: FIN packet seen |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 161 | * CLOSE_WAIT: ACK seen (after FIN) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 162 | * LAST_ACK: FIN seen (after FIN) |
| 163 | * TIME_WAIT: last ACK seen |
| 164 | * CLOSE: closed connection |
| 165 | * |
| 166 | * LISTEN state is not used. |
| 167 | * |
| 168 | * Packets marked as IGNORED (sIG): |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 169 | * if they may be either invalid or valid |
| 170 | * and the receiver may send back a connection |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 171 | * closing RST or a SYN/ACK. |
| 172 | * |
| 173 | * Packets marked as INVALID (sIV): |
| 174 | * if they are invalid |
| 175 | * or we do not support the request (simultaneous open) |
| 176 | */ |
| 177 | static enum tcp_conntrack tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = { |
| 178 | { |
| 179 | /* ORIGINAL */ |
| 180 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ |
| 181 | /*syn*/ { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sIV }, |
| 182 | /* |
| 183 | * sNO -> sSS Initialize a new connection |
| 184 | * sSS -> sSS Retransmitted SYN |
| 185 | * sSR -> sIG Late retransmitted SYN? |
| 186 | * sES -> sIG Error: SYNs in window outside the SYN_SENT state |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 187 | * are errors. Receiver will reply with RST |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 188 | * and close the connection. |
| 189 | * Or we are not in sync and hold a dead connection. |
| 190 | * sFW -> sIG |
| 191 | * sCW -> sIG |
| 192 | * sLA -> sIG |
| 193 | * sTW -> sSS Reopened connection (RFC 1122). |
| 194 | * sCL -> sSS |
| 195 | */ |
| 196 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ |
| 197 | /*synack*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }, |
| 198 | /* |
| 199 | * A SYN/ACK from the client is always invalid: |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 200 | * - either it tries to set up a simultaneous open, which is |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 201 | * not supported; |
| 202 | * - or the firewall has just been inserted between the two hosts |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 203 | * during the session set-up. The SYN will be retransmitted |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 204 | * by the true client (or it'll time out). |
| 205 | */ |
| 206 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ |
| 207 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, |
| 208 | /* |
| 209 | * sNO -> sIV Too late and no reason to do anything... |
| 210 | * sSS -> sIV Client migth not send FIN in this state: |
| 211 | * we enforce waiting for a SYN/ACK reply first. |
| 212 | * sSR -> sFW Close started. |
| 213 | * sES -> sFW |
| 214 | * sFW -> sLA FIN seen in both directions, waiting for |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 215 | * the last ACK. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 216 | * Migth be a retransmitted FIN as well... |
| 217 | * sCW -> sLA |
| 218 | * sLA -> sLA Retransmitted FIN. Remain in the same state. |
| 219 | * sTW -> sTW |
| 220 | * sCL -> sCL |
| 221 | */ |
| 222 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ |
| 223 | /*ack*/ { sES, sIV, sES, sES, sCW, sCW, sTW, sTW, sCL, sIV }, |
| 224 | /* |
| 225 | * sNO -> sES Assumed. |
| 226 | * sSS -> sIV ACK is invalid: we haven't seen a SYN/ACK yet. |
| 227 | * sSR -> sES Established state is reached. |
| 228 | * sES -> sES :-) |
| 229 | * sFW -> sCW Normal close request answered by ACK. |
| 230 | * sCW -> sCW |
| 231 | * sLA -> sTW Last ACK detected. |
| 232 | * sTW -> sTW Retransmitted last ACK. Remain in the same state. |
| 233 | * sCL -> sCL |
| 234 | */ |
| 235 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ |
| 236 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV }, |
| 237 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } |
| 238 | }, |
| 239 | { |
| 240 | /* REPLY */ |
| 241 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ |
| 242 | /*syn*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }, |
| 243 | /* |
| 244 | * sNO -> sIV Never reached. |
| 245 | * sSS -> sIV Simultaneous open, not supported |
| 246 | * sSR -> sIV Simultaneous open, not supported. |
| 247 | * sES -> sIV Server may not initiate a connection. |
| 248 | * sFW -> sIV |
| 249 | * sCW -> sIV |
| 250 | * sLA -> sIV |
| 251 | * sTW -> sIV Reopened connection, but server may not do it. |
| 252 | * sCL -> sIV |
| 253 | */ |
| 254 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ |
| 255 | /*synack*/ { sIV, sSR, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sIV }, |
| 256 | /* |
| 257 | * sSS -> sSR Standard open. |
| 258 | * sSR -> sSR Retransmitted SYN/ACK. |
| 259 | * sES -> sIG Late retransmitted SYN/ACK? |
| 260 | * sFW -> sIG Might be SYN/ACK answering ignored SYN |
| 261 | * sCW -> sIG |
| 262 | * sLA -> sIG |
| 263 | * sTW -> sIG |
| 264 | * sCL -> sIG |
| 265 | */ |
| 266 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ |
| 267 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, |
| 268 | /* |
| 269 | * sSS -> sIV Server might not send FIN in this state. |
| 270 | * sSR -> sFW Close started. |
| 271 | * sES -> sFW |
| 272 | * sFW -> sLA FIN seen in both directions. |
| 273 | * sCW -> sLA |
| 274 | * sLA -> sLA Retransmitted FIN. |
| 275 | * sTW -> sTW |
| 276 | * sCL -> sCL |
| 277 | */ |
| 278 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ |
Jozsef Kadlecsik | 73f3060 | 2005-12-01 14:28:58 -0800 | [diff] [blame] | 279 | /*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV }, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 280 | /* |
Jozsef Kadlecsik | 73f3060 | 2005-12-01 14:28:58 -0800 | [diff] [blame] | 281 | * sSS -> sIG Might be a half-open connection. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 282 | * sSR -> sSR Might answer late resent SYN. |
| 283 | * sES -> sES :-) |
| 284 | * sFW -> sCW Normal close request answered by ACK. |
| 285 | * sCW -> sCW |
| 286 | * sLA -> sTW Last ACK detected. |
| 287 | * sTW -> sTW Retransmitted last ACK. |
| 288 | * sCL -> sCL |
| 289 | */ |
| 290 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */ |
| 291 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV }, |
| 292 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 293 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 294 | }; |
| 295 | |
| 296 | static int tcp_pkt_to_tuple(const struct sk_buff *skb, |
| 297 | unsigned int dataoff, |
| 298 | struct nf_conntrack_tuple *tuple) |
| 299 | { |
| 300 | struct tcphdr _hdr, *hp; |
| 301 | |
| 302 | /* Actually only need first 8 bytes. */ |
| 303 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); |
| 304 | if (hp == NULL) |
| 305 | return 0; |
| 306 | |
| 307 | tuple->src.u.tcp.port = hp->source; |
| 308 | tuple->dst.u.tcp.port = hp->dest; |
| 309 | |
| 310 | return 1; |
| 311 | } |
| 312 | |
| 313 | static int tcp_invert_tuple(struct nf_conntrack_tuple *tuple, |
| 314 | const struct nf_conntrack_tuple *orig) |
| 315 | { |
| 316 | tuple->src.u.tcp.port = orig->dst.u.tcp.port; |
| 317 | tuple->dst.u.tcp.port = orig->src.u.tcp.port; |
| 318 | return 1; |
| 319 | } |
| 320 | |
| 321 | /* Print out the per-protocol part of the tuple. */ |
| 322 | static int tcp_print_tuple(struct seq_file *s, |
| 323 | const struct nf_conntrack_tuple *tuple) |
| 324 | { |
| 325 | return seq_printf(s, "sport=%hu dport=%hu ", |
| 326 | ntohs(tuple->src.u.tcp.port), |
| 327 | ntohs(tuple->dst.u.tcp.port)); |
| 328 | } |
| 329 | |
| 330 | /* Print out the private part of the conntrack. */ |
| 331 | static int tcp_print_conntrack(struct seq_file *s, |
| 332 | const struct nf_conn *conntrack) |
| 333 | { |
| 334 | enum tcp_conntrack state; |
| 335 | |
| 336 | read_lock_bh(&tcp_lock); |
| 337 | state = conntrack->proto.tcp.state; |
| 338 | read_unlock_bh(&tcp_lock); |
| 339 | |
| 340 | return seq_printf(s, "%s ", tcp_conntrack_names[state]); |
| 341 | } |
| 342 | |
| 343 | static unsigned int get_conntrack_index(const struct tcphdr *tcph) |
| 344 | { |
| 345 | if (tcph->rst) return TCP_RST_SET; |
| 346 | else if (tcph->syn) return (tcph->ack ? TCP_SYNACK_SET : TCP_SYN_SET); |
| 347 | else if (tcph->fin) return TCP_FIN_SET; |
| 348 | else if (tcph->ack) return TCP_ACK_SET; |
| 349 | else return TCP_NONE_SET; |
| 350 | } |
| 351 | |
| 352 | /* TCP connection tracking based on 'Real Stateful TCP Packet Filtering |
| 353 | in IP Filter' by Guido van Rooij. |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 354 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 355 | http://www.nluug.nl/events/sane2000/papers.html |
| 356 | http://www.iae.nl/users/guido/papers/tcp_filtering.ps.gz |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 357 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 358 | The boundaries and the conditions are changed according to RFC793: |
| 359 | the packet must intersect the window (i.e. segments may be |
| 360 | after the right or before the left edge) and thus receivers may ACK |
| 361 | segments after the right edge of the window. |
| 362 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 363 | td_maxend = max(sack + max(win,1)) seen in reply packets |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 364 | td_maxwin = max(max(win, 1)) + (sack - ack) seen in sent packets |
| 365 | td_maxwin += seq + len - sender.td_maxend |
| 366 | if seq + len > sender.td_maxend |
| 367 | td_end = max(seq + len) seen in sent packets |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 368 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 369 | I. Upper bound for valid data: seq <= sender.td_maxend |
| 370 | II. Lower bound for valid data: seq + len >= sender.td_end - receiver.td_maxwin |
| 371 | III. Upper bound for valid ack: sack <= receiver.td_end |
| 372 | IV. Lower bound for valid ack: ack >= receiver.td_end - MAXACKWINDOW |
| 373 | |
| 374 | where sack is the highest right edge of sack block found in the packet. |
| 375 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 376 | The upper bound limit for a valid ack is not ignored - |
| 377 | we doesn't have to deal with fragments. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 378 | */ |
| 379 | |
| 380 | static inline __u32 segment_seq_plus_len(__u32 seq, |
| 381 | size_t len, |
| 382 | unsigned int dataoff, |
| 383 | struct tcphdr *tcph) |
| 384 | { |
| 385 | /* XXX Should I use payload length field in IP/IPv6 header ? |
| 386 | * - YK */ |
| 387 | return (seq + len - dataoff - tcph->doff*4 |
| 388 | + (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0)); |
| 389 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 390 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 391 | /* Fixme: what about big packets? */ |
| 392 | #define MAXACKWINCONST 66000 |
| 393 | #define MAXACKWINDOW(sender) \ |
| 394 | ((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin \ |
| 395 | : MAXACKWINCONST) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 396 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 397 | /* |
| 398 | * Simplified tcp_parse_options routine from tcp_input.c |
| 399 | */ |
| 400 | static void tcp_options(const struct sk_buff *skb, |
| 401 | unsigned int dataoff, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 402 | struct tcphdr *tcph, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 403 | struct ip_ct_tcp_state *state) |
| 404 | { |
| 405 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; |
| 406 | unsigned char *ptr; |
| 407 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
| 408 | |
| 409 | if (!length) |
| 410 | return; |
| 411 | |
| 412 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), |
| 413 | length, buff); |
| 414 | BUG_ON(ptr == NULL); |
| 415 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 416 | state->td_scale = |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 417 | state->flags = 0; |
| 418 | |
| 419 | while (length > 0) { |
| 420 | int opcode=*ptr++; |
| 421 | int opsize; |
| 422 | |
| 423 | switch (opcode) { |
| 424 | case TCPOPT_EOL: |
| 425 | return; |
| 426 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ |
| 427 | length--; |
| 428 | continue; |
| 429 | default: |
| 430 | opsize=*ptr++; |
| 431 | if (opsize < 2) /* "silly options" */ |
| 432 | return; |
| 433 | if (opsize > length) |
| 434 | break; /* don't parse partial options */ |
| 435 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 436 | if (opcode == TCPOPT_SACK_PERM |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 437 | && opsize == TCPOLEN_SACK_PERM) |
| 438 | state->flags |= IP_CT_TCP_FLAG_SACK_PERM; |
| 439 | else if (opcode == TCPOPT_WINDOW |
| 440 | && opsize == TCPOLEN_WINDOW) { |
| 441 | state->td_scale = *(u_int8_t *)ptr; |
| 442 | |
| 443 | if (state->td_scale > 14) { |
| 444 | /* See RFC1323 */ |
| 445 | state->td_scale = 14; |
| 446 | } |
| 447 | state->flags |= |
| 448 | IP_CT_TCP_FLAG_WINDOW_SCALE; |
| 449 | } |
| 450 | ptr += opsize - 2; |
| 451 | length -= opsize; |
| 452 | } |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff, |
| 457 | struct tcphdr *tcph, __u32 *sack) |
| 458 | { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 459 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 460 | unsigned char *ptr; |
| 461 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
| 462 | __u32 tmp; |
| 463 | |
| 464 | if (!length) |
| 465 | return; |
| 466 | |
| 467 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), |
| 468 | length, buff); |
| 469 | BUG_ON(ptr == NULL); |
| 470 | |
| 471 | /* Fast path for timestamp-only option */ |
| 472 | if (length == TCPOLEN_TSTAMP_ALIGNED*4 |
Patrick McHardy | bff9a89 | 2006-12-02 22:05:08 -0800 | [diff] [blame] | 473 | && *(__be32 *)ptr == |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 474 | __constant_htonl((TCPOPT_NOP << 24) |
| 475 | | (TCPOPT_NOP << 16) |
| 476 | | (TCPOPT_TIMESTAMP << 8) |
| 477 | | TCPOLEN_TIMESTAMP)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 478 | return; |
| 479 | |
| 480 | while (length > 0) { |
| 481 | int opcode = *ptr++; |
| 482 | int opsize, i; |
| 483 | |
| 484 | switch (opcode) { |
| 485 | case TCPOPT_EOL: |
| 486 | return; |
| 487 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ |
| 488 | length--; |
| 489 | continue; |
| 490 | default: |
| 491 | opsize = *ptr++; |
| 492 | if (opsize < 2) /* "silly options" */ |
| 493 | return; |
| 494 | if (opsize > length) |
| 495 | break; /* don't parse partial options */ |
| 496 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 497 | if (opcode == TCPOPT_SACK |
| 498 | && opsize >= (TCPOLEN_SACK_BASE |
| 499 | + TCPOLEN_SACK_PERBLOCK) |
| 500 | && !((opsize - TCPOLEN_SACK_BASE) |
| 501 | % TCPOLEN_SACK_PERBLOCK)) { |
| 502 | for (i = 0; |
| 503 | i < (opsize - TCPOLEN_SACK_BASE); |
| 504 | i += TCPOLEN_SACK_PERBLOCK) { |
| 505 | tmp = ntohl(*((__be32 *)(ptr+i)+1)); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 506 | |
| 507 | if (after(tmp, *sack)) |
| 508 | *sack = tmp; |
| 509 | } |
| 510 | return; |
| 511 | } |
| 512 | ptr += opsize - 2; |
| 513 | length -= opsize; |
| 514 | } |
| 515 | } |
| 516 | } |
| 517 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 518 | static int tcp_in_window(struct ip_ct_tcp *state, |
| 519 | enum ip_conntrack_dir dir, |
| 520 | unsigned int index, |
| 521 | const struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 522 | unsigned int dataoff, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 523 | struct tcphdr *tcph, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 524 | int pf) |
| 525 | { |
| 526 | struct ip_ct_tcp_state *sender = &state->seen[dir]; |
| 527 | struct ip_ct_tcp_state *receiver = &state->seen[!dir]; |
| 528 | __u32 seq, ack, sack, end, win, swin; |
| 529 | int res; |
| 530 | |
| 531 | /* |
| 532 | * Get the required data from the packet. |
| 533 | */ |
| 534 | seq = ntohl(tcph->seq); |
| 535 | ack = sack = ntohl(tcph->ack_seq); |
| 536 | win = ntohs(tcph->window); |
| 537 | end = segment_seq_plus_len(seq, skb->len, dataoff, tcph); |
| 538 | |
| 539 | if (receiver->flags & IP_CT_TCP_FLAG_SACK_PERM) |
| 540 | tcp_sack(skb, dataoff, tcph, &sack); |
| 541 | |
| 542 | DEBUGP("tcp_in_window: START\n"); |
| 543 | DEBUGP("tcp_in_window: src=%u.%u.%u.%u:%hu dst=%u.%u.%u.%u:%hu " |
| 544 | "seq=%u ack=%u sack=%u win=%u end=%u\n", |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 545 | NIPQUAD(iph->saddr), ntohs(tcph->source), |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 546 | NIPQUAD(iph->daddr), ntohs(tcph->dest), |
| 547 | seq, ack, sack, win, end); |
| 548 | DEBUGP("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " |
| 549 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", |
| 550 | sender->td_end, sender->td_maxend, sender->td_maxwin, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 551 | sender->td_scale, |
| 552 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 553 | receiver->td_scale); |
| 554 | |
| 555 | if (sender->td_end == 0) { |
| 556 | /* |
| 557 | * Initialize sender data. |
| 558 | */ |
| 559 | if (tcph->syn && tcph->ack) { |
| 560 | /* |
| 561 | * Outgoing SYN-ACK in reply to a SYN. |
| 562 | */ |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 563 | sender->td_end = |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 564 | sender->td_maxend = end; |
| 565 | sender->td_maxwin = (win == 0 ? 1 : win); |
| 566 | |
| 567 | tcp_options(skb, dataoff, tcph, sender); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 568 | /* |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 569 | * RFC 1323: |
| 570 | * Both sides must send the Window Scale option |
| 571 | * to enable window scaling in either direction. |
| 572 | */ |
| 573 | if (!(sender->flags & IP_CT_TCP_FLAG_WINDOW_SCALE |
| 574 | && receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE)) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 575 | sender->td_scale = |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 576 | receiver->td_scale = 0; |
| 577 | } else { |
| 578 | /* |
| 579 | * We are in the middle of a connection, |
| 580 | * its history is lost for us. |
| 581 | * Let's try to use the data from the packet. |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 582 | */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 583 | sender->td_end = end; |
| 584 | sender->td_maxwin = (win == 0 ? 1 : win); |
| 585 | sender->td_maxend = end + sender->td_maxwin; |
| 586 | } |
| 587 | } else if (((state->state == TCP_CONNTRACK_SYN_SENT |
| 588 | && dir == IP_CT_DIR_ORIGINAL) |
| 589 | || (state->state == TCP_CONNTRACK_SYN_RECV |
| 590 | && dir == IP_CT_DIR_REPLY)) |
| 591 | && after(end, sender->td_end)) { |
| 592 | /* |
| 593 | * RFC 793: "if a TCP is reinitialized ... then it need |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 594 | * not wait at all; it must only be sure to use sequence |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 595 | * numbers larger than those recently used." |
| 596 | */ |
| 597 | sender->td_end = |
| 598 | sender->td_maxend = end; |
| 599 | sender->td_maxwin = (win == 0 ? 1 : win); |
| 600 | |
| 601 | tcp_options(skb, dataoff, tcph, sender); |
| 602 | } |
| 603 | |
| 604 | if (!(tcph->ack)) { |
| 605 | /* |
| 606 | * If there is no ACK, just pretend it was set and OK. |
| 607 | */ |
| 608 | ack = sack = receiver->td_end; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 609 | } else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) == |
| 610 | (TCP_FLAG_ACK|TCP_FLAG_RST)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 611 | && (ack == 0)) { |
| 612 | /* |
| 613 | * Broken TCP stacks, that set ACK in RST packets as well |
| 614 | * with zero ack value. |
| 615 | */ |
| 616 | ack = sack = receiver->td_end; |
| 617 | } |
| 618 | |
| 619 | if (seq == end |
| 620 | && (!tcph->rst |
| 621 | || (seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT))) |
| 622 | /* |
| 623 | * Packets contains no data: we assume it is valid |
| 624 | * and check the ack value only. |
| 625 | * However RST segments are always validated by their |
| 626 | * SEQ number, except when seq == 0 (reset sent answering |
| 627 | * SYN. |
| 628 | */ |
| 629 | seq = end = sender->td_end; |
| 630 | |
| 631 | DEBUGP("tcp_in_window: src=%u.%u.%u.%u:%hu dst=%u.%u.%u.%u:%hu " |
| 632 | "seq=%u ack=%u sack =%u win=%u end=%u\n", |
| 633 | NIPQUAD(iph->saddr), ntohs(tcph->source), |
| 634 | NIPQUAD(iph->daddr), ntohs(tcph->dest), |
| 635 | seq, ack, sack, win, end); |
| 636 | DEBUGP("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " |
| 637 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", |
| 638 | sender->td_end, sender->td_maxend, sender->td_maxwin, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 639 | sender->td_scale, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 640 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, |
| 641 | receiver->td_scale); |
| 642 | |
| 643 | DEBUGP("tcp_in_window: I=%i II=%i III=%i IV=%i\n", |
| 644 | before(seq, sender->td_maxend + 1), |
| 645 | after(end, sender->td_end - receiver->td_maxwin - 1), |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 646 | before(sack, receiver->td_end + 1), |
| 647 | after(ack, receiver->td_end - MAXACKWINDOW(sender))); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 648 | |
Patrick McHardy | a09113c | 2007-02-07 15:05:33 -0800 | [diff] [blame] | 649 | if (before(seq, sender->td_maxend + 1) && |
| 650 | after(end, sender->td_end - receiver->td_maxwin - 1) && |
| 651 | before(sack, receiver->td_end + 1) && |
| 652 | after(ack, receiver->td_end - MAXACKWINDOW(sender))) { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 653 | /* |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 654 | * Take into account window scaling (RFC 1323). |
| 655 | */ |
| 656 | if (!tcph->syn) |
| 657 | win <<= sender->td_scale; |
| 658 | |
| 659 | /* |
| 660 | * Update sender data. |
| 661 | */ |
| 662 | swin = win + (sack - ack); |
| 663 | if (sender->td_maxwin < swin) |
| 664 | sender->td_maxwin = swin; |
| 665 | if (after(end, sender->td_end)) |
| 666 | sender->td_end = end; |
| 667 | /* |
| 668 | * Update receiver data. |
| 669 | */ |
| 670 | if (after(end, sender->td_maxend)) |
| 671 | receiver->td_maxwin += end - sender->td_maxend; |
| 672 | if (after(sack + win, receiver->td_maxend - 1)) { |
| 673 | receiver->td_maxend = sack + win; |
| 674 | if (win == 0) |
| 675 | receiver->td_maxend++; |
| 676 | } |
| 677 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 678 | /* |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 679 | * Check retransmissions. |
| 680 | */ |
| 681 | if (index == TCP_ACK_SET) { |
| 682 | if (state->last_dir == dir |
| 683 | && state->last_seq == seq |
| 684 | && state->last_ack == ack |
George Hansper | c1fe3ca | 2006-09-20 12:03:23 -0700 | [diff] [blame] | 685 | && state->last_end == end |
| 686 | && state->last_win == win) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 687 | state->retrans++; |
| 688 | else { |
| 689 | state->last_dir = dir; |
| 690 | state->last_seq = seq; |
| 691 | state->last_ack = ack; |
| 692 | state->last_end = end; |
George Hansper | c1fe3ca | 2006-09-20 12:03:23 -0700 | [diff] [blame] | 693 | state->last_win = win; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 694 | state->retrans = 0; |
| 695 | } |
| 696 | } |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 697 | res = 1; |
| 698 | } else { |
Patrick McHardy | a09113c | 2007-02-07 15:05:33 -0800 | [diff] [blame] | 699 | res = 0; |
| 700 | if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL || |
| 701 | nf_ct_tcp_be_liberal) |
| 702 | res = 1; |
| 703 | if (!res && LOG_INVALID(IPPROTO_TCP)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 704 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 705 | "nf_ct_tcp: %s ", |
| 706 | before(seq, sender->td_maxend + 1) ? |
| 707 | after(end, sender->td_end - receiver->td_maxwin - 1) ? |
| 708 | before(sack, receiver->td_end + 1) ? |
| 709 | after(ack, receiver->td_end - MAXACKWINDOW(sender)) ? "BUG" |
| 710 | : "ACK is under the lower bound (possible overly delayed ACK)" |
| 711 | : "ACK is over the upper bound (ACKed data not seen yet)" |
| 712 | : "SEQ is under the lower bound (already ACKed data retransmitted)" |
| 713 | : "SEQ is over the upper bound (over the window of the receiver)"); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 714 | } |
| 715 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 716 | DEBUGP("tcp_in_window: res=%i sender end=%u maxend=%u maxwin=%u " |
| 717 | "receiver end=%u maxend=%u maxwin=%u\n", |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 718 | res, sender->td_end, sender->td_maxend, sender->td_maxwin, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 719 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin); |
| 720 | |
| 721 | return res; |
| 722 | } |
| 723 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 724 | #ifdef CONFIG_NF_NAT_NEEDED |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 725 | /* Update sender->td_end after NAT successfully mangled the packet */ |
| 726 | /* Caller must linearize skb at tcp header. */ |
| 727 | void nf_conntrack_tcp_update(struct sk_buff *skb, |
| 728 | unsigned int dataoff, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 729 | struct nf_conn *conntrack, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 730 | int dir) |
| 731 | { |
| 732 | struct tcphdr *tcph = (void *)skb->data + dataoff; |
| 733 | __u32 end; |
| 734 | #ifdef DEBUGP_VARS |
| 735 | struct ip_ct_tcp_state *sender = &conntrack->proto.tcp.seen[dir]; |
| 736 | struct ip_ct_tcp_state *receiver = &conntrack->proto.tcp.seen[!dir]; |
| 737 | #endif |
| 738 | |
| 739 | end = segment_seq_plus_len(ntohl(tcph->seq), skb->len, dataoff, tcph); |
| 740 | |
| 741 | write_lock_bh(&tcp_lock); |
| 742 | /* |
| 743 | * We have to worry for the ack in the reply packet only... |
| 744 | */ |
| 745 | if (after(end, conntrack->proto.tcp.seen[dir].td_end)) |
| 746 | conntrack->proto.tcp.seen[dir].td_end = end; |
| 747 | conntrack->proto.tcp.last_end = end; |
| 748 | write_unlock_bh(&tcp_lock); |
| 749 | DEBUGP("tcp_update: sender end=%u maxend=%u maxwin=%u scale=%i " |
| 750 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", |
| 751 | sender->td_end, sender->td_maxend, sender->td_maxwin, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 752 | sender->td_scale, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 753 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, |
| 754 | receiver->td_scale); |
| 755 | } |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 756 | EXPORT_SYMBOL_GPL(nf_conntrack_tcp_update); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 757 | #endif |
| 758 | |
| 759 | #define TH_FIN 0x01 |
| 760 | #define TH_SYN 0x02 |
| 761 | #define TH_RST 0x04 |
| 762 | #define TH_PUSH 0x08 |
| 763 | #define TH_ACK 0x10 |
| 764 | #define TH_URG 0x20 |
| 765 | #define TH_ECE 0x40 |
| 766 | #define TH_CWR 0x80 |
| 767 | |
| 768 | /* table of valid flag combinations - ECE and CWR are always valid */ |
| 769 | static u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG) + 1] = |
| 770 | { |
| 771 | [TH_SYN] = 1, |
| 772 | [TH_SYN|TH_ACK] = 1, |
Vlad Drukker | a2d7222 | 2005-11-12 12:13:14 -0800 | [diff] [blame] | 773 | [TH_SYN|TH_PUSH] = 1, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 774 | [TH_SYN|TH_ACK|TH_PUSH] = 1, |
| 775 | [TH_RST] = 1, |
| 776 | [TH_RST|TH_ACK] = 1, |
| 777 | [TH_RST|TH_ACK|TH_PUSH] = 1, |
| 778 | [TH_FIN|TH_ACK] = 1, |
| 779 | [TH_ACK] = 1, |
| 780 | [TH_ACK|TH_PUSH] = 1, |
| 781 | [TH_ACK|TH_URG] = 1, |
| 782 | [TH_ACK|TH_URG|TH_PUSH] = 1, |
| 783 | [TH_FIN|TH_ACK|TH_PUSH] = 1, |
| 784 | [TH_FIN|TH_ACK|TH_URG] = 1, |
| 785 | [TH_FIN|TH_ACK|TH_URG|TH_PUSH] = 1, |
| 786 | }; |
| 787 | |
| 788 | /* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */ |
| 789 | static int tcp_error(struct sk_buff *skb, |
| 790 | unsigned int dataoff, |
| 791 | enum ip_conntrack_info *ctinfo, |
| 792 | int pf, |
Patrick McHardy | 96f6bf8 | 2006-04-06 14:19:24 -0700 | [diff] [blame] | 793 | unsigned int hooknum) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 794 | { |
| 795 | struct tcphdr _tcph, *th; |
| 796 | unsigned int tcplen = skb->len - dataoff; |
| 797 | u_int8_t tcpflags; |
| 798 | |
| 799 | /* Smaller that minimal TCP header? */ |
| 800 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); |
| 801 | if (th == NULL) { |
| 802 | if (LOG_INVALID(IPPROTO_TCP)) |
| 803 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 804 | "nf_ct_tcp: short packet "); |
| 805 | return -NF_ACCEPT; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 806 | } |
| 807 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 808 | /* Not whole TCP header or malformed packet */ |
| 809 | if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) { |
| 810 | if (LOG_INVALID(IPPROTO_TCP)) |
| 811 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 812 | "nf_ct_tcp: truncated/malformed packet "); |
| 813 | return -NF_ACCEPT; |
| 814 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 815 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 816 | /* Checksum invalid? Ignore. |
| 817 | * We skip checking packets on the outgoing path |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 818 | * because the checksum is assumed to be correct. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 819 | */ |
| 820 | /* FIXME: Source route IP option packets --RR */ |
Patrick McHardy | 39a27a3 | 2006-05-29 18:23:54 -0700 | [diff] [blame] | 821 | if (nf_conntrack_checksum && |
| 822 | ((pf == PF_INET && hooknum == NF_IP_PRE_ROUTING) || |
| 823 | (pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING)) && |
Patrick McHardy | 96f6bf8 | 2006-04-06 14:19:24 -0700 | [diff] [blame] | 824 | nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) { |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 825 | if (LOG_INVALID(IPPROTO_TCP)) |
| 826 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 827 | "nf_ct_tcp: bad TCP checksum "); |
| 828 | return -NF_ACCEPT; |
| 829 | } |
| 830 | |
| 831 | /* Check TCP flags. */ |
| 832 | tcpflags = (((u_int8_t *)th)[13] & ~(TH_ECE|TH_CWR)); |
| 833 | if (!tcp_valid_flags[tcpflags]) { |
| 834 | if (LOG_INVALID(IPPROTO_TCP)) |
| 835 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 836 | "nf_ct_tcp: invalid TCP flag combination "); |
| 837 | return -NF_ACCEPT; |
| 838 | } |
| 839 | |
| 840 | return NF_ACCEPT; |
| 841 | } |
| 842 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 843 | /* Returns verdict for packet, or -1 for invalid. */ |
| 844 | static int tcp_packet(struct nf_conn *conntrack, |
| 845 | const struct sk_buff *skb, |
| 846 | unsigned int dataoff, |
| 847 | enum ip_conntrack_info ctinfo, |
| 848 | int pf, |
| 849 | unsigned int hooknum) |
| 850 | { |
| 851 | enum tcp_conntrack new_state, old_state; |
| 852 | enum ip_conntrack_dir dir; |
| 853 | struct tcphdr *th, _tcph; |
| 854 | unsigned long timeout; |
| 855 | unsigned int index; |
| 856 | |
| 857 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); |
| 858 | BUG_ON(th == NULL); |
| 859 | |
| 860 | write_lock_bh(&tcp_lock); |
| 861 | old_state = conntrack->proto.tcp.state; |
| 862 | dir = CTINFO2DIR(ctinfo); |
| 863 | index = get_conntrack_index(th); |
| 864 | new_state = tcp_conntracks[dir][index][old_state]; |
| 865 | |
| 866 | switch (new_state) { |
| 867 | case TCP_CONNTRACK_IGNORE: |
Jozsef Kadlecsik | 73f3060 | 2005-12-01 14:28:58 -0800 | [diff] [blame] | 868 | /* Ignored packets: |
| 869 | * |
| 870 | * a) SYN in ORIGINAL |
| 871 | * b) SYN/ACK in REPLY |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 872 | * c) ACK in reply direction after initial SYN in original. |
Jozsef Kadlecsik | 73f3060 | 2005-12-01 14:28:58 -0800 | [diff] [blame] | 873 | */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 874 | if (index == TCP_SYNACK_SET |
| 875 | && conntrack->proto.tcp.last_index == TCP_SYN_SET |
| 876 | && conntrack->proto.tcp.last_dir != dir |
| 877 | && ntohl(th->ack_seq) == |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 878 | conntrack->proto.tcp.last_end) { |
| 879 | /* This SYN/ACK acknowledges a SYN that we earlier |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 880 | * ignored as invalid. This means that the client and |
| 881 | * the server are both in sync, while the firewall is |
| 882 | * not. We kill this session and block the SYN/ACK so |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 883 | * that the client cannot but retransmit its SYN and |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 884 | * thus initiate a clean new session. |
| 885 | */ |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 886 | write_unlock_bh(&tcp_lock); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 887 | if (LOG_INVALID(IPPROTO_TCP)) |
| 888 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 889 | "nf_ct_tcp: killing out of sync session "); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 890 | if (del_timer(&conntrack->timeout)) |
| 891 | conntrack->timeout.function((unsigned long) |
| 892 | conntrack); |
| 893 | return -NF_DROP; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 894 | } |
| 895 | conntrack->proto.tcp.last_index = index; |
| 896 | conntrack->proto.tcp.last_dir = dir; |
| 897 | conntrack->proto.tcp.last_seq = ntohl(th->seq); |
| 898 | conntrack->proto.tcp.last_end = |
| 899 | segment_seq_plus_len(ntohl(th->seq), skb->len, dataoff, th); |
| 900 | |
| 901 | write_unlock_bh(&tcp_lock); |
| 902 | if (LOG_INVALID(IPPROTO_TCP)) |
| 903 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 904 | "nf_ct_tcp: invalid packed ignored "); |
| 905 | return NF_ACCEPT; |
| 906 | case TCP_CONNTRACK_MAX: |
| 907 | /* Invalid packet */ |
| 908 | DEBUGP("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n", |
| 909 | dir, get_conntrack_index(th), |
| 910 | old_state); |
| 911 | write_unlock_bh(&tcp_lock); |
| 912 | if (LOG_INVALID(IPPROTO_TCP)) |
| 913 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
| 914 | "nf_ct_tcp: invalid state "); |
| 915 | return -NF_ACCEPT; |
| 916 | case TCP_CONNTRACK_SYN_SENT: |
| 917 | if (old_state < TCP_CONNTRACK_TIME_WAIT) |
| 918 | break; |
| 919 | if ((conntrack->proto.tcp.seen[dir].flags & |
| 920 | IP_CT_TCP_FLAG_CLOSE_INIT) |
| 921 | || after(ntohl(th->seq), |
| 922 | conntrack->proto.tcp.seen[dir].td_end)) { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 923 | /* Attempt to reopen a closed connection. |
| 924 | * Delete this connection and look up again. */ |
| 925 | write_unlock_bh(&tcp_lock); |
| 926 | if (del_timer(&conntrack->timeout)) |
| 927 | conntrack->timeout.function((unsigned long) |
| 928 | conntrack); |
| 929 | return -NF_REPEAT; |
KOVACS Krisztian | 3746a2b | 2005-11-14 15:23:01 -0800 | [diff] [blame] | 930 | } else { |
| 931 | write_unlock_bh(&tcp_lock); |
| 932 | if (LOG_INVALID(IPPROTO_TCP)) |
| 933 | nf_log_packet(pf, 0, skb, NULL, NULL, |
| 934 | NULL, "nf_ct_tcp: invalid SYN"); |
| 935 | return -NF_ACCEPT; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 936 | } |
| 937 | case TCP_CONNTRACK_CLOSE: |
| 938 | if (index == TCP_RST_SET |
Jozsef Kadlecsik | 73f3060 | 2005-12-01 14:28:58 -0800 | [diff] [blame] | 939 | && ((test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status) |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 940 | && conntrack->proto.tcp.last_index == TCP_SYN_SET) |
| 941 | || (!test_bit(IPS_ASSURED_BIT, &conntrack->status) |
| 942 | && conntrack->proto.tcp.last_index == TCP_ACK_SET)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 943 | && ntohl(th->ack_seq) == conntrack->proto.tcp.last_end) { |
Adrian Bunk | 93b1fae | 2006-01-10 00:13:33 +0100 | [diff] [blame] | 944 | /* RST sent to invalid SYN or ACK we had let through |
Jozsef Kadlecsik | 73f3060 | 2005-12-01 14:28:58 -0800 | [diff] [blame] | 945 | * at a) and c) above: |
| 946 | * |
| 947 | * a) SYN was in window then |
| 948 | * c) we hold a half-open connection. |
| 949 | * |
| 950 | * Delete our connection entry. |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 951 | * We skip window checking, because packet might ACK |
Jozsef Kadlecsik | 73f3060 | 2005-12-01 14:28:58 -0800 | [diff] [blame] | 952 | * segments we ignored. */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 953 | goto in_window; |
| 954 | } |
Adrian Bunk | 93b1fae | 2006-01-10 00:13:33 +0100 | [diff] [blame] | 955 | /* Just fall through */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 956 | default: |
| 957 | /* Keep compilers happy. */ |
| 958 | break; |
| 959 | } |
| 960 | |
| 961 | if (!tcp_in_window(&conntrack->proto.tcp, dir, index, |
| 962 | skb, dataoff, th, pf)) { |
| 963 | write_unlock_bh(&tcp_lock); |
| 964 | return -NF_ACCEPT; |
| 965 | } |
| 966 | in_window: |
| 967 | /* From now on we have got in-window packets */ |
| 968 | conntrack->proto.tcp.last_index = index; |
| 969 | |
| 970 | DEBUGP("tcp_conntracks: src=%u.%u.%u.%u:%hu dst=%u.%u.%u.%u:%hu " |
| 971 | "syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n", |
| 972 | NIPQUAD(iph->saddr), ntohs(th->source), |
| 973 | NIPQUAD(iph->daddr), ntohs(th->dest), |
| 974 | (th->syn ? 1 : 0), (th->ack ? 1 : 0), |
| 975 | (th->fin ? 1 : 0), (th->rst ? 1 : 0), |
| 976 | old_state, new_state); |
| 977 | |
| 978 | conntrack->proto.tcp.state = new_state; |
| 979 | if (old_state != new_state |
| 980 | && (new_state == TCP_CONNTRACK_FIN_WAIT |
| 981 | || new_state == TCP_CONNTRACK_CLOSE)) |
| 982 | conntrack->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT; |
| 983 | timeout = conntrack->proto.tcp.retrans >= nf_ct_tcp_max_retrans |
| 984 | && *tcp_timeouts[new_state] > nf_ct_tcp_timeout_max_retrans |
| 985 | ? nf_ct_tcp_timeout_max_retrans : *tcp_timeouts[new_state]; |
| 986 | write_unlock_bh(&tcp_lock); |
| 987 | |
| 988 | nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb); |
| 989 | if (new_state != old_state) |
| 990 | nf_conntrack_event_cache(IPCT_PROTOINFO, skb); |
| 991 | |
| 992 | if (!test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)) { |
| 993 | /* If only reply is a RST, we can consider ourselves not to |
| 994 | have an established connection: this is a fairly common |
| 995 | problem case, so we can delete the conntrack |
| 996 | immediately. --RR */ |
| 997 | if (th->rst) { |
| 998 | if (del_timer(&conntrack->timeout)) |
| 999 | conntrack->timeout.function((unsigned long) |
| 1000 | conntrack); |
| 1001 | return NF_ACCEPT; |
| 1002 | } |
| 1003 | } else if (!test_bit(IPS_ASSURED_BIT, &conntrack->status) |
| 1004 | && (old_state == TCP_CONNTRACK_SYN_RECV |
| 1005 | || old_state == TCP_CONNTRACK_ESTABLISHED) |
| 1006 | && new_state == TCP_CONNTRACK_ESTABLISHED) { |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1007 | /* Set ASSURED if we see see valid ack in ESTABLISHED |
| 1008 | after SYN_RECV or a valid answer for a picked up |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1009 | connection. */ |
| 1010 | set_bit(IPS_ASSURED_BIT, &conntrack->status); |
| 1011 | nf_conntrack_event_cache(IPCT_STATUS, skb); |
| 1012 | } |
| 1013 | nf_ct_refresh_acct(conntrack, ctinfo, skb, timeout); |
| 1014 | |
| 1015 | return NF_ACCEPT; |
| 1016 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1017 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1018 | /* Called when a new connection for this protocol found. */ |
| 1019 | static int tcp_new(struct nf_conn *conntrack, |
| 1020 | const struct sk_buff *skb, |
| 1021 | unsigned int dataoff) |
| 1022 | { |
| 1023 | enum tcp_conntrack new_state; |
| 1024 | struct tcphdr *th, _tcph; |
| 1025 | #ifdef DEBUGP_VARS |
| 1026 | struct ip_ct_tcp_state *sender = &conntrack->proto.tcp.seen[0]; |
| 1027 | struct ip_ct_tcp_state *receiver = &conntrack->proto.tcp.seen[1]; |
| 1028 | #endif |
| 1029 | |
| 1030 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); |
| 1031 | BUG_ON(th == NULL); |
| 1032 | |
| 1033 | /* Don't need lock here: this conntrack not in circulation yet */ |
| 1034 | new_state |
| 1035 | = tcp_conntracks[0][get_conntrack_index(th)] |
| 1036 | [TCP_CONNTRACK_NONE]; |
| 1037 | |
| 1038 | /* Invalid: delete conntrack */ |
| 1039 | if (new_state >= TCP_CONNTRACK_MAX) { |
| 1040 | DEBUGP("nf_ct_tcp: invalid new deleting.\n"); |
| 1041 | return 0; |
| 1042 | } |
| 1043 | |
| 1044 | if (new_state == TCP_CONNTRACK_SYN_SENT) { |
| 1045 | /* SYN packet */ |
| 1046 | conntrack->proto.tcp.seen[0].td_end = |
| 1047 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
| 1048 | dataoff, th); |
| 1049 | conntrack->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
| 1050 | if (conntrack->proto.tcp.seen[0].td_maxwin == 0) |
| 1051 | conntrack->proto.tcp.seen[0].td_maxwin = 1; |
| 1052 | conntrack->proto.tcp.seen[0].td_maxend = |
| 1053 | conntrack->proto.tcp.seen[0].td_end; |
| 1054 | |
| 1055 | tcp_options(skb, dataoff, th, &conntrack->proto.tcp.seen[0]); |
| 1056 | conntrack->proto.tcp.seen[1].flags = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1057 | } else if (nf_ct_tcp_loose == 0) { |
| 1058 | /* Don't try to pick up connections. */ |
| 1059 | return 0; |
| 1060 | } else { |
| 1061 | /* |
| 1062 | * We are in the middle of a connection, |
| 1063 | * its history is lost for us. |
| 1064 | * Let's try to use the data from the packet. |
| 1065 | */ |
| 1066 | conntrack->proto.tcp.seen[0].td_end = |
| 1067 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
| 1068 | dataoff, th); |
| 1069 | conntrack->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
| 1070 | if (conntrack->proto.tcp.seen[0].td_maxwin == 0) |
| 1071 | conntrack->proto.tcp.seen[0].td_maxwin = 1; |
| 1072 | conntrack->proto.tcp.seen[0].td_maxend = |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1073 | conntrack->proto.tcp.seen[0].td_end + |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1074 | conntrack->proto.tcp.seen[0].td_maxwin; |
| 1075 | conntrack->proto.tcp.seen[0].td_scale = 0; |
| 1076 | |
Patrick McHardy | a09113c | 2007-02-07 15:05:33 -0800 | [diff] [blame] | 1077 | /* We assume SACK and liberal window checking to handle |
| 1078 | * window scaling */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1079 | conntrack->proto.tcp.seen[0].flags = |
Patrick McHardy | a09113c | 2007-02-07 15:05:33 -0800 | [diff] [blame] | 1080 | conntrack->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM | |
| 1081 | IP_CT_TCP_FLAG_BE_LIBERAL; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1082 | } |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1083 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1084 | conntrack->proto.tcp.seen[1].td_end = 0; |
| 1085 | conntrack->proto.tcp.seen[1].td_maxend = 0; |
| 1086 | conntrack->proto.tcp.seen[1].td_maxwin = 1; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1087 | conntrack->proto.tcp.seen[1].td_scale = 0; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1088 | |
| 1089 | /* tcp_packet will set them */ |
| 1090 | conntrack->proto.tcp.state = TCP_CONNTRACK_NONE; |
| 1091 | conntrack->proto.tcp.last_index = TCP_NONE_SET; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1092 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1093 | DEBUGP("tcp_new: sender end=%u maxend=%u maxwin=%u scale=%i " |
| 1094 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", |
| 1095 | sender->td_end, sender->td_maxend, sender->td_maxwin, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1096 | sender->td_scale, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1097 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, |
| 1098 | receiver->td_scale); |
| 1099 | return 1; |
| 1100 | } |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1101 | |
Patrick McHardy | e281db5c | 2007-03-04 15:57:25 -0800 | [diff] [blame^] | 1102 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1103 | |
| 1104 | #include <linux/netfilter/nfnetlink.h> |
| 1105 | #include <linux/netfilter/nfnetlink_conntrack.h> |
| 1106 | |
| 1107 | static int tcp_to_nfattr(struct sk_buff *skb, struct nfattr *nfa, |
| 1108 | const struct nf_conn *ct) |
| 1109 | { |
| 1110 | struct nfattr *nest_parms; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1111 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1112 | read_lock_bh(&tcp_lock); |
| 1113 | nest_parms = NFA_NEST(skb, CTA_PROTOINFO_TCP); |
| 1114 | NFA_PUT(skb, CTA_PROTOINFO_TCP_STATE, sizeof(u_int8_t), |
| 1115 | &ct->proto.tcp.state); |
| 1116 | read_unlock_bh(&tcp_lock); |
| 1117 | |
| 1118 | NFA_NEST_END(skb, nest_parms); |
| 1119 | |
| 1120 | return 0; |
| 1121 | |
| 1122 | nfattr_failure: |
| 1123 | read_unlock_bh(&tcp_lock); |
| 1124 | return -1; |
| 1125 | } |
| 1126 | |
| 1127 | static const size_t cta_min_tcp[CTA_PROTOINFO_TCP_MAX] = { |
| 1128 | [CTA_PROTOINFO_TCP_STATE-1] = sizeof(u_int8_t), |
| 1129 | }; |
| 1130 | |
| 1131 | static int nfattr_to_tcp(struct nfattr *cda[], struct nf_conn *ct) |
| 1132 | { |
| 1133 | struct nfattr *attr = cda[CTA_PROTOINFO_TCP-1]; |
| 1134 | struct nfattr *tb[CTA_PROTOINFO_TCP_MAX]; |
| 1135 | |
| 1136 | /* updates could not contain anything about the private |
| 1137 | * protocol info, in that case skip the parsing */ |
| 1138 | if (!attr) |
| 1139 | return 0; |
| 1140 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1141 | nfattr_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, attr); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1142 | |
| 1143 | if (nfattr_bad_size(tb, CTA_PROTOINFO_TCP_MAX, cta_min_tcp)) |
| 1144 | return -EINVAL; |
| 1145 | |
| 1146 | if (!tb[CTA_PROTOINFO_TCP_STATE-1]) |
| 1147 | return -EINVAL; |
| 1148 | |
| 1149 | write_lock_bh(&tcp_lock); |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1150 | ct->proto.tcp.state = |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1151 | *(u_int8_t *)NFA_DATA(tb[CTA_PROTOINFO_TCP_STATE-1]); |
| 1152 | write_unlock_bh(&tcp_lock); |
| 1153 | |
| 1154 | return 0; |
| 1155 | } |
| 1156 | #endif |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1157 | |
| 1158 | #ifdef CONFIG_SYSCTL |
| 1159 | static unsigned int tcp_sysctl_table_users; |
| 1160 | static struct ctl_table_header *tcp_sysctl_header; |
| 1161 | static struct ctl_table tcp_sysctl_table[] = { |
| 1162 | { |
| 1163 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT, |
| 1164 | .procname = "nf_conntrack_tcp_timeout_syn_sent", |
| 1165 | .data = &nf_ct_tcp_timeout_syn_sent, |
| 1166 | .maxlen = sizeof(unsigned int), |
| 1167 | .mode = 0644, |
| 1168 | .proc_handler = &proc_dointvec_jiffies, |
| 1169 | }, |
| 1170 | { |
| 1171 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV, |
| 1172 | .procname = "nf_conntrack_tcp_timeout_syn_recv", |
| 1173 | .data = &nf_ct_tcp_timeout_syn_recv, |
| 1174 | .maxlen = sizeof(unsigned int), |
| 1175 | .mode = 0644, |
| 1176 | .proc_handler = &proc_dointvec_jiffies, |
| 1177 | }, |
| 1178 | { |
| 1179 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED, |
| 1180 | .procname = "nf_conntrack_tcp_timeout_established", |
| 1181 | .data = &nf_ct_tcp_timeout_established, |
| 1182 | .maxlen = sizeof(unsigned int), |
| 1183 | .mode = 0644, |
| 1184 | .proc_handler = &proc_dointvec_jiffies, |
| 1185 | }, |
| 1186 | { |
| 1187 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT, |
| 1188 | .procname = "nf_conntrack_tcp_timeout_fin_wait", |
| 1189 | .data = &nf_ct_tcp_timeout_fin_wait, |
| 1190 | .maxlen = sizeof(unsigned int), |
| 1191 | .mode = 0644, |
| 1192 | .proc_handler = &proc_dointvec_jiffies, |
| 1193 | }, |
| 1194 | { |
| 1195 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT, |
| 1196 | .procname = "nf_conntrack_tcp_timeout_close_wait", |
| 1197 | .data = &nf_ct_tcp_timeout_close_wait, |
| 1198 | .maxlen = sizeof(unsigned int), |
| 1199 | .mode = 0644, |
| 1200 | .proc_handler = &proc_dointvec_jiffies, |
| 1201 | }, |
| 1202 | { |
| 1203 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK, |
| 1204 | .procname = "nf_conntrack_tcp_timeout_last_ack", |
| 1205 | .data = &nf_ct_tcp_timeout_last_ack, |
| 1206 | .maxlen = sizeof(unsigned int), |
| 1207 | .mode = 0644, |
| 1208 | .proc_handler = &proc_dointvec_jiffies, |
| 1209 | }, |
| 1210 | { |
| 1211 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT, |
| 1212 | .procname = "nf_conntrack_tcp_timeout_time_wait", |
| 1213 | .data = &nf_ct_tcp_timeout_time_wait, |
| 1214 | .maxlen = sizeof(unsigned int), |
| 1215 | .mode = 0644, |
| 1216 | .proc_handler = &proc_dointvec_jiffies, |
| 1217 | }, |
| 1218 | { |
| 1219 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE, |
| 1220 | .procname = "nf_conntrack_tcp_timeout_close", |
| 1221 | .data = &nf_ct_tcp_timeout_close, |
| 1222 | .maxlen = sizeof(unsigned int), |
| 1223 | .mode = 0644, |
| 1224 | .proc_handler = &proc_dointvec_jiffies, |
| 1225 | }, |
| 1226 | { |
| 1227 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS, |
| 1228 | .procname = "nf_conntrack_tcp_timeout_max_retrans", |
| 1229 | .data = &nf_ct_tcp_timeout_max_retrans, |
| 1230 | .maxlen = sizeof(unsigned int), |
| 1231 | .mode = 0644, |
| 1232 | .proc_handler = &proc_dointvec_jiffies, |
| 1233 | }, |
| 1234 | { |
| 1235 | .ctl_name = NET_NF_CONNTRACK_TCP_LOOSE, |
| 1236 | .procname = "nf_conntrack_tcp_loose", |
| 1237 | .data = &nf_ct_tcp_loose, |
| 1238 | .maxlen = sizeof(unsigned int), |
| 1239 | .mode = 0644, |
| 1240 | .proc_handler = &proc_dointvec, |
| 1241 | }, |
| 1242 | { |
| 1243 | .ctl_name = NET_NF_CONNTRACK_TCP_BE_LIBERAL, |
| 1244 | .procname = "nf_conntrack_tcp_be_liberal", |
| 1245 | .data = &nf_ct_tcp_be_liberal, |
| 1246 | .maxlen = sizeof(unsigned int), |
| 1247 | .mode = 0644, |
| 1248 | .proc_handler = &proc_dointvec, |
| 1249 | }, |
| 1250 | { |
| 1251 | .ctl_name = NET_NF_CONNTRACK_TCP_MAX_RETRANS, |
| 1252 | .procname = "nf_conntrack_tcp_max_retrans", |
| 1253 | .data = &nf_ct_tcp_max_retrans, |
| 1254 | .maxlen = sizeof(unsigned int), |
| 1255 | .mode = 0644, |
| 1256 | .proc_handler = &proc_dointvec, |
| 1257 | }, |
| 1258 | { |
| 1259 | .ctl_name = 0 |
| 1260 | } |
| 1261 | }; |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 1262 | |
| 1263 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 1264 | static struct ctl_table tcp_compat_sysctl_table[] = { |
| 1265 | { |
| 1266 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT, |
| 1267 | .procname = "ip_conntrack_tcp_timeout_syn_sent", |
| 1268 | .data = &nf_ct_tcp_timeout_syn_sent, |
| 1269 | .maxlen = sizeof(unsigned int), |
| 1270 | .mode = 0644, |
| 1271 | .proc_handler = &proc_dointvec_jiffies, |
| 1272 | }, |
| 1273 | { |
| 1274 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV, |
| 1275 | .procname = "ip_conntrack_tcp_timeout_syn_recv", |
| 1276 | .data = &nf_ct_tcp_timeout_syn_recv, |
| 1277 | .maxlen = sizeof(unsigned int), |
| 1278 | .mode = 0644, |
| 1279 | .proc_handler = &proc_dointvec_jiffies, |
| 1280 | }, |
| 1281 | { |
| 1282 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED, |
| 1283 | .procname = "ip_conntrack_tcp_timeout_established", |
| 1284 | .data = &nf_ct_tcp_timeout_established, |
| 1285 | .maxlen = sizeof(unsigned int), |
| 1286 | .mode = 0644, |
| 1287 | .proc_handler = &proc_dointvec_jiffies, |
| 1288 | }, |
| 1289 | { |
| 1290 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT, |
| 1291 | .procname = "ip_conntrack_tcp_timeout_fin_wait", |
| 1292 | .data = &nf_ct_tcp_timeout_fin_wait, |
| 1293 | .maxlen = sizeof(unsigned int), |
| 1294 | .mode = 0644, |
| 1295 | .proc_handler = &proc_dointvec_jiffies, |
| 1296 | }, |
| 1297 | { |
| 1298 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT, |
| 1299 | .procname = "ip_conntrack_tcp_timeout_close_wait", |
| 1300 | .data = &nf_ct_tcp_timeout_close_wait, |
| 1301 | .maxlen = sizeof(unsigned int), |
| 1302 | .mode = 0644, |
| 1303 | .proc_handler = &proc_dointvec_jiffies, |
| 1304 | }, |
| 1305 | { |
| 1306 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK, |
| 1307 | .procname = "ip_conntrack_tcp_timeout_last_ack", |
| 1308 | .data = &nf_ct_tcp_timeout_last_ack, |
| 1309 | .maxlen = sizeof(unsigned int), |
| 1310 | .mode = 0644, |
| 1311 | .proc_handler = &proc_dointvec_jiffies, |
| 1312 | }, |
| 1313 | { |
| 1314 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT, |
| 1315 | .procname = "ip_conntrack_tcp_timeout_time_wait", |
| 1316 | .data = &nf_ct_tcp_timeout_time_wait, |
| 1317 | .maxlen = sizeof(unsigned int), |
| 1318 | .mode = 0644, |
| 1319 | .proc_handler = &proc_dointvec_jiffies, |
| 1320 | }, |
| 1321 | { |
| 1322 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE, |
| 1323 | .procname = "ip_conntrack_tcp_timeout_close", |
| 1324 | .data = &nf_ct_tcp_timeout_close, |
| 1325 | .maxlen = sizeof(unsigned int), |
| 1326 | .mode = 0644, |
| 1327 | .proc_handler = &proc_dointvec_jiffies, |
| 1328 | }, |
| 1329 | { |
| 1330 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS, |
| 1331 | .procname = "ip_conntrack_tcp_timeout_max_retrans", |
| 1332 | .data = &nf_ct_tcp_timeout_max_retrans, |
| 1333 | .maxlen = sizeof(unsigned int), |
| 1334 | .mode = 0644, |
| 1335 | .proc_handler = &proc_dointvec_jiffies, |
| 1336 | }, |
| 1337 | { |
| 1338 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_LOOSE, |
| 1339 | .procname = "ip_conntrack_tcp_loose", |
| 1340 | .data = &nf_ct_tcp_loose, |
| 1341 | .maxlen = sizeof(unsigned int), |
| 1342 | .mode = 0644, |
| 1343 | .proc_handler = &proc_dointvec, |
| 1344 | }, |
| 1345 | { |
| 1346 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL, |
| 1347 | .procname = "ip_conntrack_tcp_be_liberal", |
| 1348 | .data = &nf_ct_tcp_be_liberal, |
| 1349 | .maxlen = sizeof(unsigned int), |
| 1350 | .mode = 0644, |
| 1351 | .proc_handler = &proc_dointvec, |
| 1352 | }, |
| 1353 | { |
| 1354 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS, |
| 1355 | .procname = "ip_conntrack_tcp_max_retrans", |
| 1356 | .data = &nf_ct_tcp_max_retrans, |
| 1357 | .maxlen = sizeof(unsigned int), |
| 1358 | .mode = 0644, |
| 1359 | .proc_handler = &proc_dointvec, |
| 1360 | }, |
| 1361 | { |
| 1362 | .ctl_name = 0 |
| 1363 | } |
| 1364 | }; |
| 1365 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1366 | #endif /* CONFIG_SYSCTL */ |
| 1367 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1368 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 = |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1369 | { |
| 1370 | .l3proto = PF_INET, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1371 | .l4proto = IPPROTO_TCP, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1372 | .name = "tcp", |
| 1373 | .pkt_to_tuple = tcp_pkt_to_tuple, |
| 1374 | .invert_tuple = tcp_invert_tuple, |
| 1375 | .print_tuple = tcp_print_tuple, |
| 1376 | .print_conntrack = tcp_print_conntrack, |
| 1377 | .packet = tcp_packet, |
| 1378 | .new = tcp_new, |
Patrick McHardy | 96f6bf8 | 2006-04-06 14:19:24 -0700 | [diff] [blame] | 1379 | .error = tcp_error, |
Patrick McHardy | e281db5c | 2007-03-04 15:57:25 -0800 | [diff] [blame^] | 1380 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1381 | .to_nfattr = tcp_to_nfattr, |
| 1382 | .from_nfattr = nfattr_to_tcp, |
| 1383 | .tuple_to_nfattr = nf_ct_port_tuple_to_nfattr, |
| 1384 | .nfattr_to_tuple = nf_ct_port_nfattr_to_tuple, |
| 1385 | #endif |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1386 | #ifdef CONFIG_SYSCTL |
| 1387 | .ctl_table_users = &tcp_sysctl_table_users, |
| 1388 | .ctl_table_header = &tcp_sysctl_header, |
| 1389 | .ctl_table = tcp_sysctl_table, |
Patrick McHardy | a999e68 | 2006-11-29 02:35:20 +0100 | [diff] [blame] | 1390 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
| 1391 | .ctl_compat_table = tcp_compat_sysctl_table, |
| 1392 | #endif |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1393 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1394 | }; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1395 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1396 | |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1397 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 = |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1398 | { |
| 1399 | .l3proto = PF_INET6, |
Martin Josefsson | 605dcad | 2006-11-29 02:35:06 +0100 | [diff] [blame] | 1400 | .l4proto = IPPROTO_TCP, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1401 | .name = "tcp", |
| 1402 | .pkt_to_tuple = tcp_pkt_to_tuple, |
| 1403 | .invert_tuple = tcp_invert_tuple, |
| 1404 | .print_tuple = tcp_print_tuple, |
| 1405 | .print_conntrack = tcp_print_conntrack, |
| 1406 | .packet = tcp_packet, |
| 1407 | .new = tcp_new, |
Patrick McHardy | 96f6bf8 | 2006-04-06 14:19:24 -0700 | [diff] [blame] | 1408 | .error = tcp_error, |
Patrick McHardy | e281db5c | 2007-03-04 15:57:25 -0800 | [diff] [blame^] | 1409 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 1410 | .to_nfattr = tcp_to_nfattr, |
| 1411 | .from_nfattr = nfattr_to_tcp, |
| 1412 | .tuple_to_nfattr = nf_ct_port_tuple_to_nfattr, |
| 1413 | .nfattr_to_tuple = nf_ct_port_nfattr_to_tuple, |
| 1414 | #endif |
Patrick McHardy | 933a41e | 2006-11-29 02:35:18 +0100 | [diff] [blame] | 1415 | #ifdef CONFIG_SYSCTL |
| 1416 | .ctl_table_users = &tcp_sysctl_table_users, |
| 1417 | .ctl_table_header = &tcp_sysctl_header, |
| 1418 | .ctl_table = tcp_sysctl_table, |
| 1419 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1420 | }; |
Patrick McHardy | 13b1833 | 2006-12-02 22:11:25 -0800 | [diff] [blame] | 1421 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6); |