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9fb9cbb1 YK |
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 | ||
9fb9cbb1 | 27 | #include <linux/types.h> |
9fb9cbb1 YK |
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> | |
605dcad6 | 44 | #include <net/netfilter/nf_conntrack_l4proto.h> |
f6180121 | 45 | #include <net/netfilter/nf_conntrack_ecache.h> |
9fb9cbb1 YK |
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 | ||
601e68e1 YH |
57 | /* "Be conservative in what you do, |
58 | be liberal in what you accept from others." | |
9fb9cbb1 | 59 | If it's non-zero, we mark only out of window RST segments as INVALID. */ |
3aef0fd9 | 60 | static int nf_ct_tcp_be_liberal __read_mostly = 0; |
9fb9cbb1 | 61 | |
a09113c2 | 62 | /* If it is set to zero, we disable picking up already established |
9fb9cbb1 | 63 | connections. */ |
3aef0fd9 | 64 | static int nf_ct_tcp_loose __read_mostly = 1; |
9fb9cbb1 | 65 | |
601e68e1 YH |
66 | /* Max number of the retransmitted packets without receiving an (acceptable) |
67 | ACK from the destination. If this number is reached, a shorter timer | |
9fb9cbb1 | 68 | will be started. */ |
3aef0fd9 | 69 | static int nf_ct_tcp_max_retrans __read_mostly = 3; |
9fb9cbb1 YK |
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 | }; | |
601e68e1 | 86 | |
9fb9cbb1 YK |
87 | #define SECS * HZ |
88 | #define MINS * 60 SECS | |
89 | #define HOURS * 60 MINS | |
90 | #define DAYS * 24 HOURS | |
91 | ||
933a41e7 PM |
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; | |
9fb9cbb1 YK |
100 | |
101 | /* RFC1122 says the R2 limit should be at least 100 seconds. | |
601e68e1 | 102 | Linux uses 15 packets as limit, which corresponds |
9fb9cbb1 | 103 | to ~13-30min depending on RTO. */ |
933a41e7 | 104 | static unsigned int nf_ct_tcp_timeout_max_retrans __read_mostly = 5 MINS; |
601e68e1 | 105 | |
933a41e7 PM |
106 | static unsigned int * tcp_timeouts[] = { |
107 | NULL, /* TCP_CONNTRACK_NONE */ | |
9fb9cbb1 YK |
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 | }; | |
601e68e1 | 118 | |
9fb9cbb1 YK |
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 | }; | |
601e68e1 | 141 | |
9fb9cbb1 YK |
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. | |
601e68e1 | 147 | * It is assumed that the destinations can't receive segments |
9fb9cbb1 YK |
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 | |
601e68e1 | 157 | * SYN_SENT: SYN-only packet seen |
9fb9cbb1 YK |
158 | * SYN_RECV: SYN-ACK packet seen |
159 | * ESTABLISHED: ACK packet seen | |
160 | * FIN_WAIT: FIN packet seen | |
601e68e1 | 161 | * CLOSE_WAIT: ACK seen (after FIN) |
9fb9cbb1 YK |
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): | |
601e68e1 YH |
169 | * if they may be either invalid or valid |
170 | * and the receiver may send back a connection | |
9fb9cbb1 YK |
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 | |
601e68e1 | 187 | * are errors. Receiver will reply with RST |
9fb9cbb1 YK |
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: | |
601e68e1 | 200 | * - either it tries to set up a simultaneous open, which is |
9fb9cbb1 YK |
201 | * not supported; |
202 | * - or the firewall has just been inserted between the two hosts | |
601e68e1 | 203 | * during the session set-up. The SYN will be retransmitted |
9fb9cbb1 YK |
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 | |
601e68e1 | 215 | * the last ACK. |
9fb9cbb1 YK |
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 */ | |
73f30602 | 279 | /*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV }, |
9fb9cbb1 | 280 | /* |
73f30602 | 281 | * sSS -> sIG Might be a half-open connection. |
9fb9cbb1 YK |
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 } | |
601e68e1 | 293 | } |
9fb9cbb1 YK |
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. | |
601e68e1 | 354 | |
9fb9cbb1 YK |
355 | http://www.nluug.nl/events/sane2000/papers.html |
356 | http://www.iae.nl/users/guido/papers/tcp_filtering.ps.gz | |
601e68e1 | 357 | |
9fb9cbb1 YK |
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 | ||
601e68e1 | 363 | td_maxend = max(sack + max(win,1)) seen in reply packets |
9fb9cbb1 YK |
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 | |
601e68e1 | 368 | |
9fb9cbb1 YK |
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 | ||
601e68e1 YH |
376 | The upper bound limit for a valid ack is not ignored - |
377 | we doesn't have to deal with fragments. | |
9fb9cbb1 YK |
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 | } | |
601e68e1 | 390 | |
9fb9cbb1 YK |
391 | /* Fixme: what about big packets? */ |
392 | #define MAXACKWINCONST 66000 | |
393 | #define MAXACKWINDOW(sender) \ | |
394 | ((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin \ | |
395 | : MAXACKWINCONST) | |
601e68e1 | 396 | |
9fb9cbb1 YK |
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, | |
601e68e1 | 402 | struct tcphdr *tcph, |
9fb9cbb1 YK |
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 | ||
601e68e1 | 416 | state->td_scale = |
9fb9cbb1 YK |
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 | ||
601e68e1 | 436 | if (opcode == TCPOPT_SACK_PERM |
9fb9cbb1 YK |
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 | { | |
601e68e1 | 459 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; |
9fb9cbb1 YK |
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 | |
bff9a89b | 473 | && *(__be32 *)ptr == |
601e68e1 YH |
474 | __constant_htonl((TCPOPT_NOP << 24) |
475 | | (TCPOPT_NOP << 16) | |
476 | | (TCPOPT_TIMESTAMP << 8) | |
477 | | TCPOLEN_TIMESTAMP)) | |
9fb9cbb1 YK |
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 | ||
601e68e1 YH |
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)); | |
9fb9cbb1 YK |
506 | |
507 | if (after(tmp, *sack)) | |
508 | *sack = tmp; | |
509 | } | |
510 | return; | |
511 | } | |
512 | ptr += opsize - 2; | |
513 | length -= opsize; | |
514 | } | |
515 | } | |
516 | } | |
517 | ||
601e68e1 YH |
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, | |
9fb9cbb1 | 522 | unsigned int dataoff, |
601e68e1 | 523 | struct tcphdr *tcph, |
9fb9cbb1 YK |
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", | |
601e68e1 | 545 | NIPQUAD(iph->saddr), ntohs(tcph->source), |
9fb9cbb1 YK |
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, | |
601e68e1 YH |
551 | sender->td_scale, |
552 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, | |
9fb9cbb1 YK |
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 | */ | |
601e68e1 | 563 | sender->td_end = |
9fb9cbb1 YK |
564 | sender->td_maxend = end; |
565 | sender->td_maxwin = (win == 0 ? 1 : win); | |
566 | ||
567 | tcp_options(skb, dataoff, tcph, sender); | |
601e68e1 | 568 | /* |
9fb9cbb1 YK |
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)) | |
601e68e1 | 575 | sender->td_scale = |
9fb9cbb1 YK |
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. | |
601e68e1 | 582 | */ |
9fb9cbb1 YK |
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 | |
601e68e1 | 594 | * not wait at all; it must only be sure to use sequence |
9fb9cbb1 YK |
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; | |
601e68e1 YH |
609 | } else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) == |
610 | (TCP_FLAG_ACK|TCP_FLAG_RST)) | |
9fb9cbb1 YK |
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, | |
601e68e1 | 639 | sender->td_scale, |
9fb9cbb1 YK |
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), | |
601e68e1 YH |
646 | before(sack, receiver->td_end + 1), |
647 | after(ack, receiver->td_end - MAXACKWINDOW(sender))); | |
9fb9cbb1 | 648 | |
a09113c2 PM |
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))) { | |
601e68e1 | 653 | /* |
9fb9cbb1 YK |
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 | ||
601e68e1 | 678 | /* |
9fb9cbb1 YK |
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 | |
c1fe3ca5 GH |
685 | && state->last_end == end |
686 | && state->last_win == win) | |
9fb9cbb1 YK |
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; | |
c1fe3ca5 | 693 | state->last_win = win; |
9fb9cbb1 YK |
694 | state->retrans = 0; |
695 | } | |
696 | } | |
9fb9cbb1 YK |
697 | res = 1; |
698 | } else { | |
a09113c2 PM |
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)) | |
9fb9cbb1 YK |
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)"); | |
601e68e1 YH |
714 | } |
715 | ||
9fb9cbb1 YK |
716 | DEBUGP("tcp_in_window: res=%i sender end=%u maxend=%u maxwin=%u " |
717 | "receiver end=%u maxend=%u maxwin=%u\n", | |
601e68e1 | 718 | res, sender->td_end, sender->td_maxend, sender->td_maxwin, |
9fb9cbb1 YK |
719 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin); |
720 | ||
721 | return res; | |
722 | } | |
723 | ||
5b1158e9 | 724 | #ifdef CONFIG_NF_NAT_NEEDED |
9fb9cbb1 YK |
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, | |
601e68e1 | 729 | struct nf_conn *conntrack, |
9fb9cbb1 YK |
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, | |
601e68e1 | 752 | sender->td_scale, |
9fb9cbb1 YK |
753 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, |
754 | receiver->td_scale); | |
755 | } | |
13b18339 | 756 | EXPORT_SYMBOL_GPL(nf_conntrack_tcp_update); |
9fb9cbb1 YK |
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, | |
a2d7222f | 773 | [TH_SYN|TH_PUSH] = 1, |
9fb9cbb1 YK |
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, | |
96f6bf82 | 793 | unsigned int hooknum) |
9fb9cbb1 YK |
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; | |
601e68e1 YH |
806 | } |
807 | ||
9fb9cbb1 YK |
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 | } | |
601e68e1 | 815 | |
9fb9cbb1 YK |
816 | /* Checksum invalid? Ignore. |
817 | * We skip checking packets on the outgoing path | |
84fa7933 | 818 | * because the checksum is assumed to be correct. |
9fb9cbb1 YK |
819 | */ |
820 | /* FIXME: Source route IP option packets --RR */ | |
39a27a35 PM |
821 | if (nf_conntrack_checksum && |
822 | ((pf == PF_INET && hooknum == NF_IP_PRE_ROUTING) || | |
823 | (pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING)) && | |
96f6bf82 | 824 | nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) { |
9fb9cbb1 YK |
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 | ||
9fb9cbb1 YK |
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: | |
73f30602 JK |
868 | /* Ignored packets: |
869 | * | |
870 | * a) SYN in ORIGINAL | |
871 | * b) SYN/ACK in REPLY | |
601e68e1 | 872 | * c) ACK in reply direction after initial SYN in original. |
73f30602 | 873 | */ |
9fb9cbb1 YK |
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) == | |
601e68e1 YH |
878 | conntrack->proto.tcp.last_end) { |
879 | /* This SYN/ACK acknowledges a SYN that we earlier | |
9fb9cbb1 YK |
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 | |
601e68e1 | 883 | * that the client cannot but retransmit its SYN and |
9fb9cbb1 YK |
884 | * thus initiate a clean new session. |
885 | */ | |
601e68e1 | 886 | write_unlock_bh(&tcp_lock); |
9fb9cbb1 YK |
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 "); | |
601e68e1 YH |
890 | if (del_timer(&conntrack->timeout)) |
891 | conntrack->timeout.function((unsigned long) | |
892 | conntrack); | |
893 | return -NF_DROP; | |
9fb9cbb1 YK |
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)) { | |
601e68e1 YH |
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; | |
3746a2b1 KK |
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; | |
9fb9cbb1 YK |
936 | } |
937 | case TCP_CONNTRACK_CLOSE: | |
938 | if (index == TCP_RST_SET | |
73f30602 | 939 | && ((test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status) |
601e68e1 YH |
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)) | |
9fb9cbb1 | 943 | && ntohl(th->ack_seq) == conntrack->proto.tcp.last_end) { |
93b1fae4 | 944 | /* RST sent to invalid SYN or ACK we had let through |
73f30602 JK |
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. | |
9fb9cbb1 | 951 | * We skip window checking, because packet might ACK |
73f30602 | 952 | * segments we ignored. */ |
9fb9cbb1 YK |
953 | goto in_window; |
954 | } | |
93b1fae4 | 955 | /* Just fall through */ |
9fb9cbb1 YK |
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) { | |
601e68e1 YH |
1007 | /* Set ASSURED if we see see valid ack in ESTABLISHED |
1008 | after SYN_RECV or a valid answer for a picked up | |
9fb9cbb1 YK |
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 | } | |
601e68e1 | 1017 | |
9fb9cbb1 YK |
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; | |
9fb9cbb1 YK |
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 = | |
601e68e1 | 1073 | conntrack->proto.tcp.seen[0].td_end + |
9fb9cbb1 YK |
1074 | conntrack->proto.tcp.seen[0].td_maxwin; |
1075 | conntrack->proto.tcp.seen[0].td_scale = 0; | |
1076 | ||
a09113c2 PM |
1077 | /* We assume SACK and liberal window checking to handle |
1078 | * window scaling */ | |
9fb9cbb1 | 1079 | conntrack->proto.tcp.seen[0].flags = |
a09113c2 PM |
1080 | conntrack->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM | |
1081 | IP_CT_TCP_FLAG_BE_LIBERAL; | |
9fb9cbb1 | 1082 | } |
601e68e1 | 1083 | |
9fb9cbb1 YK |
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; | |
601e68e1 | 1087 | conntrack->proto.tcp.seen[1].td_scale = 0; |
9fb9cbb1 YK |
1088 | |
1089 | /* tcp_packet will set them */ | |
1090 | conntrack->proto.tcp.state = TCP_CONNTRACK_NONE; | |
1091 | conntrack->proto.tcp.last_index = TCP_NONE_SET; | |
601e68e1 | 1092 | |
9fb9cbb1 YK |
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, | |
601e68e1 | 1096 | sender->td_scale, |
9fb9cbb1 YK |
1097 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, |
1098 | receiver->td_scale); | |
1099 | return 1; | |
1100 | } | |
c1d10adb PNA |
1101 | |
1102 | #if defined(CONFIG_NF_CT_NETLINK) || \ | |
1103 | defined(CONFIG_NF_CT_NETLINK_MODULE) | |
1104 | ||
1105 | #include <linux/netfilter/nfnetlink.h> | |
1106 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
1107 | ||
1108 | static int tcp_to_nfattr(struct sk_buff *skb, struct nfattr *nfa, | |
1109 | const struct nf_conn *ct) | |
1110 | { | |
1111 | struct nfattr *nest_parms; | |
601e68e1 | 1112 | |
c1d10adb PNA |
1113 | read_lock_bh(&tcp_lock); |
1114 | nest_parms = NFA_NEST(skb, CTA_PROTOINFO_TCP); | |
1115 | NFA_PUT(skb, CTA_PROTOINFO_TCP_STATE, sizeof(u_int8_t), | |
1116 | &ct->proto.tcp.state); | |
1117 | read_unlock_bh(&tcp_lock); | |
1118 | ||
1119 | NFA_NEST_END(skb, nest_parms); | |
1120 | ||
1121 | return 0; | |
1122 | ||
1123 | nfattr_failure: | |
1124 | read_unlock_bh(&tcp_lock); | |
1125 | return -1; | |
1126 | } | |
1127 | ||
1128 | static const size_t cta_min_tcp[CTA_PROTOINFO_TCP_MAX] = { | |
1129 | [CTA_PROTOINFO_TCP_STATE-1] = sizeof(u_int8_t), | |
1130 | }; | |
1131 | ||
1132 | static int nfattr_to_tcp(struct nfattr *cda[], struct nf_conn *ct) | |
1133 | { | |
1134 | struct nfattr *attr = cda[CTA_PROTOINFO_TCP-1]; | |
1135 | struct nfattr *tb[CTA_PROTOINFO_TCP_MAX]; | |
1136 | ||
1137 | /* updates could not contain anything about the private | |
1138 | * protocol info, in that case skip the parsing */ | |
1139 | if (!attr) | |
1140 | return 0; | |
1141 | ||
601e68e1 | 1142 | nfattr_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, attr); |
c1d10adb PNA |
1143 | |
1144 | if (nfattr_bad_size(tb, CTA_PROTOINFO_TCP_MAX, cta_min_tcp)) | |
1145 | return -EINVAL; | |
1146 | ||
1147 | if (!tb[CTA_PROTOINFO_TCP_STATE-1]) | |
1148 | return -EINVAL; | |
1149 | ||
1150 | write_lock_bh(&tcp_lock); | |
601e68e1 | 1151 | ct->proto.tcp.state = |
c1d10adb PNA |
1152 | *(u_int8_t *)NFA_DATA(tb[CTA_PROTOINFO_TCP_STATE-1]); |
1153 | write_unlock_bh(&tcp_lock); | |
1154 | ||
1155 | return 0; | |
1156 | } | |
1157 | #endif | |
933a41e7 PM |
1158 | |
1159 | #ifdef CONFIG_SYSCTL | |
1160 | static unsigned int tcp_sysctl_table_users; | |
1161 | static struct ctl_table_header *tcp_sysctl_header; | |
1162 | static struct ctl_table tcp_sysctl_table[] = { | |
1163 | { | |
1164 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT, | |
1165 | .procname = "nf_conntrack_tcp_timeout_syn_sent", | |
1166 | .data = &nf_ct_tcp_timeout_syn_sent, | |
1167 | .maxlen = sizeof(unsigned int), | |
1168 | .mode = 0644, | |
1169 | .proc_handler = &proc_dointvec_jiffies, | |
1170 | }, | |
1171 | { | |
1172 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV, | |
1173 | .procname = "nf_conntrack_tcp_timeout_syn_recv", | |
1174 | .data = &nf_ct_tcp_timeout_syn_recv, | |
1175 | .maxlen = sizeof(unsigned int), | |
1176 | .mode = 0644, | |
1177 | .proc_handler = &proc_dointvec_jiffies, | |
1178 | }, | |
1179 | { | |
1180 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED, | |
1181 | .procname = "nf_conntrack_tcp_timeout_established", | |
1182 | .data = &nf_ct_tcp_timeout_established, | |
1183 | .maxlen = sizeof(unsigned int), | |
1184 | .mode = 0644, | |
1185 | .proc_handler = &proc_dointvec_jiffies, | |
1186 | }, | |
1187 | { | |
1188 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT, | |
1189 | .procname = "nf_conntrack_tcp_timeout_fin_wait", | |
1190 | .data = &nf_ct_tcp_timeout_fin_wait, | |
1191 | .maxlen = sizeof(unsigned int), | |
1192 | .mode = 0644, | |
1193 | .proc_handler = &proc_dointvec_jiffies, | |
1194 | }, | |
1195 | { | |
1196 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT, | |
1197 | .procname = "nf_conntrack_tcp_timeout_close_wait", | |
1198 | .data = &nf_ct_tcp_timeout_close_wait, | |
1199 | .maxlen = sizeof(unsigned int), | |
1200 | .mode = 0644, | |
1201 | .proc_handler = &proc_dointvec_jiffies, | |
1202 | }, | |
1203 | { | |
1204 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK, | |
1205 | .procname = "nf_conntrack_tcp_timeout_last_ack", | |
1206 | .data = &nf_ct_tcp_timeout_last_ack, | |
1207 | .maxlen = sizeof(unsigned int), | |
1208 | .mode = 0644, | |
1209 | .proc_handler = &proc_dointvec_jiffies, | |
1210 | }, | |
1211 | { | |
1212 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT, | |
1213 | .procname = "nf_conntrack_tcp_timeout_time_wait", | |
1214 | .data = &nf_ct_tcp_timeout_time_wait, | |
1215 | .maxlen = sizeof(unsigned int), | |
1216 | .mode = 0644, | |
1217 | .proc_handler = &proc_dointvec_jiffies, | |
1218 | }, | |
1219 | { | |
1220 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_CLOSE, | |
1221 | .procname = "nf_conntrack_tcp_timeout_close", | |
1222 | .data = &nf_ct_tcp_timeout_close, | |
1223 | .maxlen = sizeof(unsigned int), | |
1224 | .mode = 0644, | |
1225 | .proc_handler = &proc_dointvec_jiffies, | |
1226 | }, | |
1227 | { | |
1228 | .ctl_name = NET_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS, | |
1229 | .procname = "nf_conntrack_tcp_timeout_max_retrans", | |
1230 | .data = &nf_ct_tcp_timeout_max_retrans, | |
1231 | .maxlen = sizeof(unsigned int), | |
1232 | .mode = 0644, | |
1233 | .proc_handler = &proc_dointvec_jiffies, | |
1234 | }, | |
1235 | { | |
1236 | .ctl_name = NET_NF_CONNTRACK_TCP_LOOSE, | |
1237 | .procname = "nf_conntrack_tcp_loose", | |
1238 | .data = &nf_ct_tcp_loose, | |
1239 | .maxlen = sizeof(unsigned int), | |
1240 | .mode = 0644, | |
1241 | .proc_handler = &proc_dointvec, | |
1242 | }, | |
1243 | { | |
1244 | .ctl_name = NET_NF_CONNTRACK_TCP_BE_LIBERAL, | |
1245 | .procname = "nf_conntrack_tcp_be_liberal", | |
1246 | .data = &nf_ct_tcp_be_liberal, | |
1247 | .maxlen = sizeof(unsigned int), | |
1248 | .mode = 0644, | |
1249 | .proc_handler = &proc_dointvec, | |
1250 | }, | |
1251 | { | |
1252 | .ctl_name = NET_NF_CONNTRACK_TCP_MAX_RETRANS, | |
1253 | .procname = "nf_conntrack_tcp_max_retrans", | |
1254 | .data = &nf_ct_tcp_max_retrans, | |
1255 | .maxlen = sizeof(unsigned int), | |
1256 | .mode = 0644, | |
1257 | .proc_handler = &proc_dointvec, | |
1258 | }, | |
1259 | { | |
1260 | .ctl_name = 0 | |
1261 | } | |
1262 | }; | |
a999e683 PM |
1263 | |
1264 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
1265 | static struct ctl_table tcp_compat_sysctl_table[] = { | |
1266 | { | |
1267 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT, | |
1268 | .procname = "ip_conntrack_tcp_timeout_syn_sent", | |
1269 | .data = &nf_ct_tcp_timeout_syn_sent, | |
1270 | .maxlen = sizeof(unsigned int), | |
1271 | .mode = 0644, | |
1272 | .proc_handler = &proc_dointvec_jiffies, | |
1273 | }, | |
1274 | { | |
1275 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV, | |
1276 | .procname = "ip_conntrack_tcp_timeout_syn_recv", | |
1277 | .data = &nf_ct_tcp_timeout_syn_recv, | |
1278 | .maxlen = sizeof(unsigned int), | |
1279 | .mode = 0644, | |
1280 | .proc_handler = &proc_dointvec_jiffies, | |
1281 | }, | |
1282 | { | |
1283 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED, | |
1284 | .procname = "ip_conntrack_tcp_timeout_established", | |
1285 | .data = &nf_ct_tcp_timeout_established, | |
1286 | .maxlen = sizeof(unsigned int), | |
1287 | .mode = 0644, | |
1288 | .proc_handler = &proc_dointvec_jiffies, | |
1289 | }, | |
1290 | { | |
1291 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT, | |
1292 | .procname = "ip_conntrack_tcp_timeout_fin_wait", | |
1293 | .data = &nf_ct_tcp_timeout_fin_wait, | |
1294 | .maxlen = sizeof(unsigned int), | |
1295 | .mode = 0644, | |
1296 | .proc_handler = &proc_dointvec_jiffies, | |
1297 | }, | |
1298 | { | |
1299 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT, | |
1300 | .procname = "ip_conntrack_tcp_timeout_close_wait", | |
1301 | .data = &nf_ct_tcp_timeout_close_wait, | |
1302 | .maxlen = sizeof(unsigned int), | |
1303 | .mode = 0644, | |
1304 | .proc_handler = &proc_dointvec_jiffies, | |
1305 | }, | |
1306 | { | |
1307 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK, | |
1308 | .procname = "ip_conntrack_tcp_timeout_last_ack", | |
1309 | .data = &nf_ct_tcp_timeout_last_ack, | |
1310 | .maxlen = sizeof(unsigned int), | |
1311 | .mode = 0644, | |
1312 | .proc_handler = &proc_dointvec_jiffies, | |
1313 | }, | |
1314 | { | |
1315 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT, | |
1316 | .procname = "ip_conntrack_tcp_timeout_time_wait", | |
1317 | .data = &nf_ct_tcp_timeout_time_wait, | |
1318 | .maxlen = sizeof(unsigned int), | |
1319 | .mode = 0644, | |
1320 | .proc_handler = &proc_dointvec_jiffies, | |
1321 | }, | |
1322 | { | |
1323 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE, | |
1324 | .procname = "ip_conntrack_tcp_timeout_close", | |
1325 | .data = &nf_ct_tcp_timeout_close, | |
1326 | .maxlen = sizeof(unsigned int), | |
1327 | .mode = 0644, | |
1328 | .proc_handler = &proc_dointvec_jiffies, | |
1329 | }, | |
1330 | { | |
1331 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS, | |
1332 | .procname = "ip_conntrack_tcp_timeout_max_retrans", | |
1333 | .data = &nf_ct_tcp_timeout_max_retrans, | |
1334 | .maxlen = sizeof(unsigned int), | |
1335 | .mode = 0644, | |
1336 | .proc_handler = &proc_dointvec_jiffies, | |
1337 | }, | |
1338 | { | |
1339 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_LOOSE, | |
1340 | .procname = "ip_conntrack_tcp_loose", | |
1341 | .data = &nf_ct_tcp_loose, | |
1342 | .maxlen = sizeof(unsigned int), | |
1343 | .mode = 0644, | |
1344 | .proc_handler = &proc_dointvec, | |
1345 | }, | |
1346 | { | |
1347 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL, | |
1348 | .procname = "ip_conntrack_tcp_be_liberal", | |
1349 | .data = &nf_ct_tcp_be_liberal, | |
1350 | .maxlen = sizeof(unsigned int), | |
1351 | .mode = 0644, | |
1352 | .proc_handler = &proc_dointvec, | |
1353 | }, | |
1354 | { | |
1355 | .ctl_name = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS, | |
1356 | .procname = "ip_conntrack_tcp_max_retrans", | |
1357 | .data = &nf_ct_tcp_max_retrans, | |
1358 | .maxlen = sizeof(unsigned int), | |
1359 | .mode = 0644, | |
1360 | .proc_handler = &proc_dointvec, | |
1361 | }, | |
1362 | { | |
1363 | .ctl_name = 0 | |
1364 | } | |
1365 | }; | |
1366 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
933a41e7 PM |
1367 | #endif /* CONFIG_SYSCTL */ |
1368 | ||
605dcad6 | 1369 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 = |
9fb9cbb1 YK |
1370 | { |
1371 | .l3proto = PF_INET, | |
605dcad6 | 1372 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1373 | .name = "tcp", |
1374 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1375 | .invert_tuple = tcp_invert_tuple, | |
1376 | .print_tuple = tcp_print_tuple, | |
1377 | .print_conntrack = tcp_print_conntrack, | |
1378 | .packet = tcp_packet, | |
1379 | .new = tcp_new, | |
96f6bf82 | 1380 | .error = tcp_error, |
c1d10adb PNA |
1381 | #if defined(CONFIG_NF_CT_NETLINK) || \ |
1382 | defined(CONFIG_NF_CT_NETLINK_MODULE) | |
1383 | .to_nfattr = tcp_to_nfattr, | |
1384 | .from_nfattr = nfattr_to_tcp, | |
1385 | .tuple_to_nfattr = nf_ct_port_tuple_to_nfattr, | |
1386 | .nfattr_to_tuple = nf_ct_port_nfattr_to_tuple, | |
1387 | #endif | |
933a41e7 PM |
1388 | #ifdef CONFIG_SYSCTL |
1389 | .ctl_table_users = &tcp_sysctl_table_users, | |
1390 | .ctl_table_header = &tcp_sysctl_header, | |
1391 | .ctl_table = tcp_sysctl_table, | |
a999e683 PM |
1392 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
1393 | .ctl_compat_table = tcp_compat_sysctl_table, | |
1394 | #endif | |
933a41e7 | 1395 | #endif |
9fb9cbb1 | 1396 | }; |
13b18339 | 1397 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4); |
9fb9cbb1 | 1398 | |
605dcad6 | 1399 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 = |
9fb9cbb1 YK |
1400 | { |
1401 | .l3proto = PF_INET6, | |
605dcad6 | 1402 | .l4proto = IPPROTO_TCP, |
9fb9cbb1 YK |
1403 | .name = "tcp", |
1404 | .pkt_to_tuple = tcp_pkt_to_tuple, | |
1405 | .invert_tuple = tcp_invert_tuple, | |
1406 | .print_tuple = tcp_print_tuple, | |
1407 | .print_conntrack = tcp_print_conntrack, | |
1408 | .packet = tcp_packet, | |
1409 | .new = tcp_new, | |
96f6bf82 | 1410 | .error = tcp_error, |
c1d10adb PNA |
1411 | #if defined(CONFIG_NF_CT_NETLINK) || \ |
1412 | defined(CONFIG_NF_CT_NETLINK_MODULE) | |
1413 | .to_nfattr = tcp_to_nfattr, | |
1414 | .from_nfattr = nfattr_to_tcp, | |
1415 | .tuple_to_nfattr = nf_ct_port_tuple_to_nfattr, | |
1416 | .nfattr_to_tuple = nf_ct_port_nfattr_to_tuple, | |
1417 | #endif | |
933a41e7 PM |
1418 | #ifdef CONFIG_SYSCTL |
1419 | .ctl_table_users = &tcp_sysctl_table_users, | |
1420 | .ctl_table_header = &tcp_sysctl_header, | |
1421 | .ctl_table = tcp_sysctl_table, | |
1422 | #endif | |
9fb9cbb1 | 1423 | }; |
13b18339 | 1424 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6); |