Root/
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 | |
9 | #include <linux/types.h> |
10 | #include <linux/timer.h> |
11 | #include <linux/module.h> |
12 | #include <linux/in.h> |
13 | #include <linux/tcp.h> |
14 | #include <linux/spinlock.h> |
15 | #include <linux/skbuff.h> |
16 | #include <linux/ipv6.h> |
17 | #include <net/ip6_checksum.h> |
18 | #include <asm/unaligned.h> |
19 | |
20 | #include <net/tcp.h> |
21 | |
22 | #include <linux/netfilter.h> |
23 | #include <linux/netfilter_ipv4.h> |
24 | #include <linux/netfilter_ipv6.h> |
25 | #include <net/netfilter/nf_conntrack.h> |
26 | #include <net/netfilter/nf_conntrack_l4proto.h> |
27 | #include <net/netfilter/nf_conntrack_ecache.h> |
28 | #include <net/netfilter/nf_log.h> |
29 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
30 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
31 | |
32 | /* "Be conservative in what you do, |
33 | be liberal in what you accept from others." |
34 | If it's non-zero, we mark only out of window RST segments as INVALID. */ |
35 | static int nf_ct_tcp_be_liberal __read_mostly = 0; |
36 | |
37 | /* If it is set to zero, we disable picking up already established |
38 | connections. */ |
39 | static int nf_ct_tcp_loose __read_mostly = 1; |
40 | |
41 | /* Max number of the retransmitted packets without receiving an (acceptable) |
42 | ACK from the destination. If this number is reached, a shorter timer |
43 | will be started. */ |
44 | static int nf_ct_tcp_max_retrans __read_mostly = 3; |
45 | |
46 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more |
47 | closely. They're more complex. --RR */ |
48 | |
49 | static const char *const tcp_conntrack_names[] = { |
50 | "NONE", |
51 | "SYN_SENT", |
52 | "SYN_RECV", |
53 | "ESTABLISHED", |
54 | "FIN_WAIT", |
55 | "CLOSE_WAIT", |
56 | "LAST_ACK", |
57 | "TIME_WAIT", |
58 | "CLOSE", |
59 | "SYN_SENT2", |
60 | }; |
61 | |
62 | #define SECS * HZ |
63 | #define MINS * 60 SECS |
64 | #define HOURS * 60 MINS |
65 | #define DAYS * 24 HOURS |
66 | |
67 | /* RFC1122 says the R2 limit should be at least 100 seconds. |
68 | Linux uses 15 packets as limit, which corresponds |
69 | to ~13-30min depending on RTO. */ |
70 | static unsigned int nf_ct_tcp_timeout_max_retrans __read_mostly = 5 MINS; |
71 | static unsigned int nf_ct_tcp_timeout_unacknowledged __read_mostly = 5 MINS; |
72 | |
73 | static unsigned int tcp_timeouts[TCP_CONNTRACK_MAX] __read_mostly = { |
74 | [TCP_CONNTRACK_SYN_SENT] = 2 MINS, |
75 | [TCP_CONNTRACK_SYN_RECV] = 60 SECS, |
76 | [TCP_CONNTRACK_ESTABLISHED] = 5 DAYS, |
77 | [TCP_CONNTRACK_FIN_WAIT] = 2 MINS, |
78 | [TCP_CONNTRACK_CLOSE_WAIT] = 60 SECS, |
79 | [TCP_CONNTRACK_LAST_ACK] = 30 SECS, |
80 | [TCP_CONNTRACK_TIME_WAIT] = 2 MINS, |
81 | [TCP_CONNTRACK_CLOSE] = 10 SECS, |
82 | [TCP_CONNTRACK_SYN_SENT2] = 2 MINS, |
83 | }; |
84 | |
85 | #define sNO TCP_CONNTRACK_NONE |
86 | #define sSS TCP_CONNTRACK_SYN_SENT |
87 | #define sSR TCP_CONNTRACK_SYN_RECV |
88 | #define sES TCP_CONNTRACK_ESTABLISHED |
89 | #define sFW TCP_CONNTRACK_FIN_WAIT |
90 | #define sCW TCP_CONNTRACK_CLOSE_WAIT |
91 | #define sLA TCP_CONNTRACK_LAST_ACK |
92 | #define sTW TCP_CONNTRACK_TIME_WAIT |
93 | #define sCL TCP_CONNTRACK_CLOSE |
94 | #define sS2 TCP_CONNTRACK_SYN_SENT2 |
95 | #define sIV TCP_CONNTRACK_MAX |
96 | #define sIG TCP_CONNTRACK_IGNORE |
97 | |
98 | /* What TCP flags are set from RST/SYN/FIN/ACK. */ |
99 | enum tcp_bit_set { |
100 | TCP_SYN_SET, |
101 | TCP_SYNACK_SET, |
102 | TCP_FIN_SET, |
103 | TCP_ACK_SET, |
104 | TCP_RST_SET, |
105 | TCP_NONE_SET, |
106 | }; |
107 | |
108 | /* |
109 | * The TCP state transition table needs a few words... |
110 | * |
111 | * We are the man in the middle. All the packets go through us |
112 | * but might get lost in transit to the destination. |
113 | * It is assumed that the destinations can't receive segments |
114 | * we haven't seen. |
115 | * |
116 | * The checked segment is in window, but our windows are *not* |
117 | * equivalent with the ones of the sender/receiver. We always |
118 | * try to guess the state of the current sender. |
119 | * |
120 | * The meaning of the states are: |
121 | * |
122 | * NONE: initial state |
123 | * SYN_SENT: SYN-only packet seen |
124 | * SYN_SENT2: SYN-only packet seen from reply dir, simultaneous open |
125 | * SYN_RECV: SYN-ACK packet seen |
126 | * ESTABLISHED: ACK packet seen |
127 | * FIN_WAIT: FIN packet seen |
128 | * CLOSE_WAIT: ACK seen (after FIN) |
129 | * LAST_ACK: FIN seen (after FIN) |
130 | * TIME_WAIT: last ACK seen |
131 | * CLOSE: closed connection (RST) |
132 | * |
133 | * Packets marked as IGNORED (sIG): |
134 | * if they may be either invalid or valid |
135 | * and the receiver may send back a connection |
136 | * closing RST or a SYN/ACK. |
137 | * |
138 | * Packets marked as INVALID (sIV): |
139 | * if we regard them as truly invalid packets |
140 | */ |
141 | static const u8 tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = { |
142 | { |
143 | /* ORIGINAL */ |
144 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
145 | /*syn*/ { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sS2 }, |
146 | /* |
147 | * sNO -> sSS Initialize a new connection |
148 | * sSS -> sSS Retransmitted SYN |
149 | * sS2 -> sS2 Late retransmitted SYN |
150 | * sSR -> sIG |
151 | * sES -> sIG Error: SYNs in window outside the SYN_SENT state |
152 | * are errors. Receiver will reply with RST |
153 | * and close the connection. |
154 | * Or we are not in sync and hold a dead connection. |
155 | * sFW -> sIG |
156 | * sCW -> sIG |
157 | * sLA -> sIG |
158 | * sTW -> sSS Reopened connection (RFC 1122). |
159 | * sCL -> sSS |
160 | */ |
161 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
162 | /*synack*/ { sIV, sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG, sSR }, |
163 | /* |
164 | * sNO -> sIV Too late and no reason to do anything |
165 | * sSS -> sIV Client can't send SYN and then SYN/ACK |
166 | * sS2 -> sSR SYN/ACK sent to SYN2 in simultaneous open |
167 | * sSR -> sIG |
168 | * sES -> sIG Error: SYNs in window outside the SYN_SENT state |
169 | * are errors. Receiver will reply with RST |
170 | * and close the connection. |
171 | * Or we are not in sync and hold a dead connection. |
172 | * sFW -> sIG |
173 | * sCW -> sIG |
174 | * sLA -> sIG |
175 | * sTW -> sIG |
176 | * sCL -> sIG |
177 | */ |
178 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
179 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, |
180 | /* |
181 | * sNO -> sIV Too late and no reason to do anything... |
182 | * sSS -> sIV Client migth not send FIN in this state: |
183 | * we enforce waiting for a SYN/ACK reply first. |
184 | * sS2 -> sIV |
185 | * sSR -> sFW Close started. |
186 | * sES -> sFW |
187 | * sFW -> sLA FIN seen in both directions, waiting for |
188 | * the last ACK. |
189 | * Migth be a retransmitted FIN as well... |
190 | * sCW -> sLA |
191 | * sLA -> sLA Retransmitted FIN. Remain in the same state. |
192 | * sTW -> sTW |
193 | * sCL -> sCL |
194 | */ |
195 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
196 | /*ack*/ { sES, sIV, sES, sES, sCW, sCW, sTW, sTW, sCL, sIV }, |
197 | /* |
198 | * sNO -> sES Assumed. |
199 | * sSS -> sIV ACK is invalid: we haven't seen a SYN/ACK yet. |
200 | * sS2 -> sIV |
201 | * sSR -> sES Established state is reached. |
202 | * sES -> sES :-) |
203 | * sFW -> sCW Normal close request answered by ACK. |
204 | * sCW -> sCW |
205 | * sLA -> sTW Last ACK detected. |
206 | * sTW -> sTW Retransmitted last ACK. Remain in the same state. |
207 | * sCL -> sCL |
208 | */ |
209 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
210 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL }, |
211 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } |
212 | }, |
213 | { |
214 | /* REPLY */ |
215 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
216 | /*syn*/ { sIV, sS2, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sS2 }, |
217 | /* |
218 | * sNO -> sIV Never reached. |
219 | * sSS -> sS2 Simultaneous open |
220 | * sS2 -> sS2 Retransmitted simultaneous SYN |
221 | * sSR -> sIV Invalid SYN packets sent by the server |
222 | * sES -> sIV |
223 | * sFW -> sIV |
224 | * sCW -> sIV |
225 | * sLA -> sIV |
226 | * sTW -> sIV Reopened connection, but server may not do it. |
227 | * sCL -> sIV |
228 | */ |
229 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
230 | /*synack*/ { sIV, sSR, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sSR }, |
231 | /* |
232 | * sSS -> sSR Standard open. |
233 | * sS2 -> sSR Simultaneous open |
234 | * sSR -> sSR Retransmitted SYN/ACK. |
235 | * sES -> sIG Late retransmitted SYN/ACK? |
236 | * sFW -> sIG Might be SYN/ACK answering ignored SYN |
237 | * sCW -> sIG |
238 | * sLA -> sIG |
239 | * sTW -> sIG |
240 | * sCL -> sIG |
241 | */ |
242 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
243 | /*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV }, |
244 | /* |
245 | * sSS -> sIV Server might not send FIN in this state. |
246 | * sS2 -> sIV |
247 | * sSR -> sFW Close started. |
248 | * sES -> sFW |
249 | * sFW -> sLA FIN seen in both directions. |
250 | * sCW -> sLA |
251 | * sLA -> sLA Retransmitted FIN. |
252 | * sTW -> sTW |
253 | * sCL -> sCL |
254 | */ |
255 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
256 | /*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIG }, |
257 | /* |
258 | * sSS -> sIG Might be a half-open connection. |
259 | * sS2 -> sIG |
260 | * sSR -> sSR Might answer late resent SYN. |
261 | * sES -> sES :-) |
262 | * sFW -> sCW Normal close request answered by ACK. |
263 | * sCW -> sCW |
264 | * sLA -> sTW Last ACK detected. |
265 | * sTW -> sTW Retransmitted last ACK. |
266 | * sCL -> sCL |
267 | */ |
268 | /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */ |
269 | /*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL }, |
270 | /*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV } |
271 | } |
272 | }; |
273 | |
274 | static bool tcp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
275 | struct nf_conntrack_tuple *tuple) |
276 | { |
277 | const struct tcphdr *hp; |
278 | struct tcphdr _hdr; |
279 | |
280 | /* Actually only need first 8 bytes. */ |
281 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); |
282 | if (hp == NULL) |
283 | return false; |
284 | |
285 | tuple->src.u.tcp.port = hp->source; |
286 | tuple->dst.u.tcp.port = hp->dest; |
287 | |
288 | return true; |
289 | } |
290 | |
291 | static bool tcp_invert_tuple(struct nf_conntrack_tuple *tuple, |
292 | const struct nf_conntrack_tuple *orig) |
293 | { |
294 | tuple->src.u.tcp.port = orig->dst.u.tcp.port; |
295 | tuple->dst.u.tcp.port = orig->src.u.tcp.port; |
296 | return true; |
297 | } |
298 | |
299 | /* Print out the per-protocol part of the tuple. */ |
300 | static int tcp_print_tuple(struct seq_file *s, |
301 | const struct nf_conntrack_tuple *tuple) |
302 | { |
303 | return seq_printf(s, "sport=%hu dport=%hu ", |
304 | ntohs(tuple->src.u.tcp.port), |
305 | ntohs(tuple->dst.u.tcp.port)); |
306 | } |
307 | |
308 | /* Print out the private part of the conntrack. */ |
309 | static int tcp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
310 | { |
311 | enum tcp_conntrack state; |
312 | |
313 | spin_lock_bh(&ct->lock); |
314 | state = ct->proto.tcp.state; |
315 | spin_unlock_bh(&ct->lock); |
316 | |
317 | return seq_printf(s, "%s ", tcp_conntrack_names[state]); |
318 | } |
319 | |
320 | static unsigned int get_conntrack_index(const struct tcphdr *tcph) |
321 | { |
322 | if (tcph->rst) return TCP_RST_SET; |
323 | else if (tcph->syn) return (tcph->ack ? TCP_SYNACK_SET : TCP_SYN_SET); |
324 | else if (tcph->fin) return TCP_FIN_SET; |
325 | else if (tcph->ack) return TCP_ACK_SET; |
326 | else return TCP_NONE_SET; |
327 | } |
328 | |
329 | /* TCP connection tracking based on 'Real Stateful TCP Packet Filtering |
330 | in IP Filter' by Guido van Rooij. |
331 | |
332 | http://www.nluug.nl/events/sane2000/papers.html |
333 | http://www.iae.nl/users/guido/papers/tcp_filtering.ps.gz |
334 | |
335 | The boundaries and the conditions are changed according to RFC793: |
336 | the packet must intersect the window (i.e. segments may be |
337 | after the right or before the left edge) and thus receivers may ACK |
338 | segments after the right edge of the window. |
339 | |
340 | td_maxend = max(sack + max(win,1)) seen in reply packets |
341 | td_maxwin = max(max(win, 1)) + (sack - ack) seen in sent packets |
342 | td_maxwin += seq + len - sender.td_maxend |
343 | if seq + len > sender.td_maxend |
344 | td_end = max(seq + len) seen in sent packets |
345 | |
346 | I. Upper bound for valid data: seq <= sender.td_maxend |
347 | II. Lower bound for valid data: seq + len >= sender.td_end - receiver.td_maxwin |
348 | III. Upper bound for valid (s)ack: sack <= receiver.td_end |
349 | IV. Lower bound for valid (s)ack: sack >= receiver.td_end - MAXACKWINDOW |
350 | |
351 | where sack is the highest right edge of sack block found in the packet |
352 | or ack in the case of packet without SACK option. |
353 | |
354 | The upper bound limit for a valid (s)ack is not ignored - |
355 | we doesn't have to deal with fragments. |
356 | */ |
357 | |
358 | static inline __u32 segment_seq_plus_len(__u32 seq, |
359 | size_t len, |
360 | unsigned int dataoff, |
361 | const struct tcphdr *tcph) |
362 | { |
363 | /* XXX Should I use payload length field in IP/IPv6 header ? |
364 | * - YK */ |
365 | return (seq + len - dataoff - tcph->doff*4 |
366 | + (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0)); |
367 | } |
368 | |
369 | /* Fixme: what about big packets? */ |
370 | #define MAXACKWINCONST 66000 |
371 | #define MAXACKWINDOW(sender) \ |
372 | ((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin \ |
373 | : MAXACKWINCONST) |
374 | |
375 | /* |
376 | * Simplified tcp_parse_options routine from tcp_input.c |
377 | */ |
378 | static void tcp_options(const struct sk_buff *skb, |
379 | unsigned int dataoff, |
380 | const struct tcphdr *tcph, |
381 | struct ip_ct_tcp_state *state) |
382 | { |
383 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; |
384 | const unsigned char *ptr; |
385 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
386 | |
387 | if (!length) |
388 | return; |
389 | |
390 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), |
391 | length, buff); |
392 | BUG_ON(ptr == NULL); |
393 | |
394 | state->td_scale = |
395 | state->flags = 0; |
396 | |
397 | while (length > 0) { |
398 | int opcode=*ptr++; |
399 | int opsize; |
400 | |
401 | switch (opcode) { |
402 | case TCPOPT_EOL: |
403 | return; |
404 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ |
405 | length--; |
406 | continue; |
407 | default: |
408 | opsize=*ptr++; |
409 | if (opsize < 2) /* "silly options" */ |
410 | return; |
411 | if (opsize > length) |
412 | break; /* don't parse partial options */ |
413 | |
414 | if (opcode == TCPOPT_SACK_PERM |
415 | && opsize == TCPOLEN_SACK_PERM) |
416 | state->flags |= IP_CT_TCP_FLAG_SACK_PERM; |
417 | else if (opcode == TCPOPT_WINDOW |
418 | && opsize == TCPOLEN_WINDOW) { |
419 | state->td_scale = *(u_int8_t *)ptr; |
420 | |
421 | if (state->td_scale > 14) { |
422 | /* See RFC1323 */ |
423 | state->td_scale = 14; |
424 | } |
425 | state->flags |= |
426 | IP_CT_TCP_FLAG_WINDOW_SCALE; |
427 | } |
428 | ptr += opsize - 2; |
429 | length -= opsize; |
430 | } |
431 | } |
432 | } |
433 | |
434 | static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff, |
435 | const struct tcphdr *tcph, __u32 *sack) |
436 | { |
437 | unsigned char buff[(15 * 4) - sizeof(struct tcphdr)]; |
438 | const unsigned char *ptr; |
439 | int length = (tcph->doff*4) - sizeof(struct tcphdr); |
440 | __u32 tmp; |
441 | |
442 | if (!length) |
443 | return; |
444 | |
445 | ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr), |
446 | length, buff); |
447 | BUG_ON(ptr == NULL); |
448 | |
449 | /* Fast path for timestamp-only option */ |
450 | if (length == TCPOLEN_TSTAMP_ALIGNED*4 |
451 | && *(__be32 *)ptr == htonl((TCPOPT_NOP << 24) |
452 | | (TCPOPT_NOP << 16) |
453 | | (TCPOPT_TIMESTAMP << 8) |
454 | | TCPOLEN_TIMESTAMP)) |
455 | return; |
456 | |
457 | while (length > 0) { |
458 | int opcode = *ptr++; |
459 | int opsize, i; |
460 | |
461 | switch (opcode) { |
462 | case TCPOPT_EOL: |
463 | return; |
464 | case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */ |
465 | length--; |
466 | continue; |
467 | default: |
468 | opsize = *ptr++; |
469 | if (opsize < 2) /* "silly options" */ |
470 | return; |
471 | if (opsize > length) |
472 | break; /* don't parse partial options */ |
473 | |
474 | if (opcode == TCPOPT_SACK |
475 | && opsize >= (TCPOLEN_SACK_BASE |
476 | + TCPOLEN_SACK_PERBLOCK) |
477 | && !((opsize - TCPOLEN_SACK_BASE) |
478 | % TCPOLEN_SACK_PERBLOCK)) { |
479 | for (i = 0; |
480 | i < (opsize - TCPOLEN_SACK_BASE); |
481 | i += TCPOLEN_SACK_PERBLOCK) { |
482 | tmp = get_unaligned_be32((__be32 *)(ptr+i)+1); |
483 | |
484 | if (after(tmp, *sack)) |
485 | *sack = tmp; |
486 | } |
487 | return; |
488 | } |
489 | ptr += opsize - 2; |
490 | length -= opsize; |
491 | } |
492 | } |
493 | } |
494 | |
495 | #ifdef CONFIG_NF_NAT_NEEDED |
496 | static inline s16 nat_offset(const struct nf_conn *ct, |
497 | enum ip_conntrack_dir dir, |
498 | u32 seq) |
499 | { |
500 | typeof(nf_ct_nat_offset) get_offset = rcu_dereference(nf_ct_nat_offset); |
501 | |
502 | return get_offset != NULL ? get_offset(ct, dir, seq) : 0; |
503 | } |
504 | #define NAT_OFFSET(pf, ct, dir, seq) \ |
505 | (pf == NFPROTO_IPV4 ? nat_offset(ct, dir, seq) : 0) |
506 | #else |
507 | #define NAT_OFFSET(pf, ct, dir, seq) 0 |
508 | #endif |
509 | |
510 | static bool tcp_in_window(const struct nf_conn *ct, |
511 | struct ip_ct_tcp *state, |
512 | enum ip_conntrack_dir dir, |
513 | unsigned int index, |
514 | const struct sk_buff *skb, |
515 | unsigned int dataoff, |
516 | const struct tcphdr *tcph, |
517 | u_int8_t pf) |
518 | { |
519 | struct net *net = nf_ct_net(ct); |
520 | struct ip_ct_tcp_state *sender = &state->seen[dir]; |
521 | struct ip_ct_tcp_state *receiver = &state->seen[!dir]; |
522 | const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple; |
523 | __u32 seq, ack, sack, end, win, swin; |
524 | s16 receiver_offset; |
525 | bool res; |
526 | |
527 | /* |
528 | * Get the required data from the packet. |
529 | */ |
530 | seq = ntohl(tcph->seq); |
531 | ack = sack = ntohl(tcph->ack_seq); |
532 | win = ntohs(tcph->window); |
533 | end = segment_seq_plus_len(seq, skb->len, dataoff, tcph); |
534 | |
535 | if (receiver->flags & IP_CT_TCP_FLAG_SACK_PERM) |
536 | tcp_sack(skb, dataoff, tcph, &sack); |
537 | |
538 | /* Take into account NAT sequence number mangling */ |
539 | receiver_offset = NAT_OFFSET(pf, ct, !dir, ack - 1); |
540 | ack -= receiver_offset; |
541 | sack -= receiver_offset; |
542 | |
543 | pr_debug("tcp_in_window: START\n"); |
544 | pr_debug("tcp_in_window: "); |
545 | nf_ct_dump_tuple(tuple); |
546 | pr_debug("seq=%u ack=%u+(%d) sack=%u+(%d) win=%u end=%u\n", |
547 | seq, ack, receiver_offset, sack, receiver_offset, win, end); |
548 | pr_debug("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, |
551 | sender->td_scale, |
552 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, |
553 | receiver->td_scale); |
554 | |
555 | if (sender->td_maxwin == 0) { |
556 | /* |
557 | * Initialize sender data. |
558 | */ |
559 | if (tcph->syn) { |
560 | /* |
561 | * SYN-ACK in reply to a SYN |
562 | * or SYN from reply direction in simultaneous open. |
563 | */ |
564 | sender->td_end = |
565 | sender->td_maxend = end; |
566 | sender->td_maxwin = (win == 0 ? 1 : win); |
567 | |
568 | tcp_options(skb, dataoff, tcph, sender); |
569 | /* |
570 | * RFC 1323: |
571 | * Both sides must send the Window Scale option |
572 | * to enable window scaling in either direction. |
573 | */ |
574 | if (!(sender->flags & IP_CT_TCP_FLAG_WINDOW_SCALE |
575 | && receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE)) |
576 | sender->td_scale = |
577 | receiver->td_scale = 0; |
578 | if (!tcph->ack) |
579 | /* Simultaneous open */ |
580 | return true; |
581 | } else { |
582 | /* |
583 | * We are in the middle of a connection, |
584 | * its history is lost for us. |
585 | * Let's try to use the data from the packet. |
586 | */ |
587 | sender->td_end = end; |
588 | win <<= sender->td_scale; |
589 | sender->td_maxwin = (win == 0 ? 1 : win); |
590 | sender->td_maxend = end + sender->td_maxwin; |
591 | /* |
592 | * We haven't seen traffic in the other direction yet |
593 | * but we have to tweak window tracking to pass III |
594 | * and IV until that happens. |
595 | */ |
596 | if (receiver->td_maxwin == 0) |
597 | receiver->td_end = receiver->td_maxend = sack; |
598 | } |
599 | } else if (((state->state == TCP_CONNTRACK_SYN_SENT |
600 | && dir == IP_CT_DIR_ORIGINAL) |
601 | || (state->state == TCP_CONNTRACK_SYN_RECV |
602 | && dir == IP_CT_DIR_REPLY)) |
603 | && after(end, sender->td_end)) { |
604 | /* |
605 | * RFC 793: "if a TCP is reinitialized ... then it need |
606 | * not wait at all; it must only be sure to use sequence |
607 | * numbers larger than those recently used." |
608 | */ |
609 | sender->td_end = |
610 | sender->td_maxend = end; |
611 | sender->td_maxwin = (win == 0 ? 1 : win); |
612 | |
613 | tcp_options(skb, dataoff, tcph, sender); |
614 | } |
615 | |
616 | if (!(tcph->ack)) { |
617 | /* |
618 | * If there is no ACK, just pretend it was set and OK. |
619 | */ |
620 | ack = sack = receiver->td_end; |
621 | } else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) == |
622 | (TCP_FLAG_ACK|TCP_FLAG_RST)) |
623 | && (ack == 0)) { |
624 | /* |
625 | * Broken TCP stacks, that set ACK in RST packets as well |
626 | * with zero ack value. |
627 | */ |
628 | ack = sack = receiver->td_end; |
629 | } |
630 | |
631 | if (seq == end |
632 | && (!tcph->rst |
633 | || (seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT))) |
634 | /* |
635 | * Packets contains no data: we assume it is valid |
636 | * and check the ack value only. |
637 | * However RST segments are always validated by their |
638 | * SEQ number, except when seq == 0 (reset sent answering |
639 | * SYN. |
640 | */ |
641 | seq = end = sender->td_end; |
642 | |
643 | pr_debug("tcp_in_window: "); |
644 | nf_ct_dump_tuple(tuple); |
645 | pr_debug("seq=%u ack=%u+(%d) sack=%u+(%d) win=%u end=%u\n", |
646 | seq, ack, receiver_offset, sack, receiver_offset, win, end); |
647 | pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i " |
648 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", |
649 | sender->td_end, sender->td_maxend, sender->td_maxwin, |
650 | sender->td_scale, |
651 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, |
652 | receiver->td_scale); |
653 | |
654 | pr_debug("tcp_in_window: I=%i II=%i III=%i IV=%i\n", |
655 | before(seq, sender->td_maxend + 1), |
656 | after(end, sender->td_end - receiver->td_maxwin - 1), |
657 | before(sack, receiver->td_end + 1), |
658 | after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1)); |
659 | |
660 | if (before(seq, sender->td_maxend + 1) && |
661 | after(end, sender->td_end - receiver->td_maxwin - 1) && |
662 | before(sack, receiver->td_end + 1) && |
663 | after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1)) { |
664 | /* |
665 | * Take into account window scaling (RFC 1323). |
666 | */ |
667 | if (!tcph->syn) |
668 | win <<= sender->td_scale; |
669 | |
670 | /* |
671 | * Update sender data. |
672 | */ |
673 | swin = win + (sack - ack); |
674 | if (sender->td_maxwin < swin) |
675 | sender->td_maxwin = swin; |
676 | if (after(end, sender->td_end)) { |
677 | sender->td_end = end; |
678 | sender->flags |= IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED; |
679 | } |
680 | if (tcph->ack) { |
681 | if (!(sender->flags & IP_CT_TCP_FLAG_MAXACK_SET)) { |
682 | sender->td_maxack = ack; |
683 | sender->flags |= IP_CT_TCP_FLAG_MAXACK_SET; |
684 | } else if (after(ack, sender->td_maxack)) |
685 | sender->td_maxack = ack; |
686 | } |
687 | |
688 | /* |
689 | * Update receiver data. |
690 | */ |
691 | if (receiver->td_maxwin != 0 && after(end, sender->td_maxend)) |
692 | receiver->td_maxwin += end - sender->td_maxend; |
693 | if (after(sack + win, receiver->td_maxend - 1)) { |
694 | receiver->td_maxend = sack + win; |
695 | if (win == 0) |
696 | receiver->td_maxend++; |
697 | } |
698 | if (ack == receiver->td_end) |
699 | receiver->flags &= ~IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED; |
700 | |
701 | /* |
702 | * Check retransmissions. |
703 | */ |
704 | if (index == TCP_ACK_SET) { |
705 | if (state->last_dir == dir |
706 | && state->last_seq == seq |
707 | && state->last_ack == ack |
708 | && state->last_end == end |
709 | && state->last_win == win) |
710 | state->retrans++; |
711 | else { |
712 | state->last_dir = dir; |
713 | state->last_seq = seq; |
714 | state->last_ack = ack; |
715 | state->last_end = end; |
716 | state->last_win = win; |
717 | state->retrans = 0; |
718 | } |
719 | } |
720 | res = true; |
721 | } else { |
722 | res = false; |
723 | if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL || |
724 | nf_ct_tcp_be_liberal) |
725 | res = true; |
726 | if (!res && LOG_INVALID(net, IPPROTO_TCP)) |
727 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
728 | "nf_ct_tcp: %s ", |
729 | before(seq, sender->td_maxend + 1) ? |
730 | after(end, sender->td_end - receiver->td_maxwin - 1) ? |
731 | before(sack, receiver->td_end + 1) ? |
732 | after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1) ? "BUG" |
733 | : "ACK is under the lower bound (possible overly delayed ACK)" |
734 | : "ACK is over the upper bound (ACKed data not seen yet)" |
735 | : "SEQ is under the lower bound (already ACKed data retransmitted)" |
736 | : "SEQ is over the upper bound (over the window of the receiver)"); |
737 | } |
738 | |
739 | pr_debug("tcp_in_window: res=%u sender end=%u maxend=%u maxwin=%u " |
740 | "receiver end=%u maxend=%u maxwin=%u\n", |
741 | res, sender->td_end, sender->td_maxend, sender->td_maxwin, |
742 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin); |
743 | |
744 | return res; |
745 | } |
746 | |
747 | /* table of valid flag combinations - PUSH, ECE and CWR are always valid */ |
748 | static const u8 tcp_valid_flags[(TCPHDR_FIN|TCPHDR_SYN|TCPHDR_RST|TCPHDR_ACK| |
749 | TCPHDR_URG) + 1] = |
750 | { |
751 | [TCPHDR_SYN] = 1, |
752 | [TCPHDR_SYN|TCPHDR_URG] = 1, |
753 | [TCPHDR_SYN|TCPHDR_ACK] = 1, |
754 | [TCPHDR_RST] = 1, |
755 | [TCPHDR_RST|TCPHDR_ACK] = 1, |
756 | [TCPHDR_FIN|TCPHDR_ACK] = 1, |
757 | [TCPHDR_FIN|TCPHDR_ACK|TCPHDR_URG] = 1, |
758 | [TCPHDR_ACK] = 1, |
759 | [TCPHDR_ACK|TCPHDR_URG] = 1, |
760 | }; |
761 | |
762 | /* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */ |
763 | static int tcp_error(struct net *net, struct nf_conn *tmpl, |
764 | struct sk_buff *skb, |
765 | unsigned int dataoff, |
766 | enum ip_conntrack_info *ctinfo, |
767 | u_int8_t pf, |
768 | unsigned int hooknum) |
769 | { |
770 | const struct tcphdr *th; |
771 | struct tcphdr _tcph; |
772 | unsigned int tcplen = skb->len - dataoff; |
773 | u_int8_t tcpflags; |
774 | |
775 | /* Smaller that minimal TCP header? */ |
776 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); |
777 | if (th == NULL) { |
778 | if (LOG_INVALID(net, IPPROTO_TCP)) |
779 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
780 | "nf_ct_tcp: short packet "); |
781 | return -NF_ACCEPT; |
782 | } |
783 | |
784 | /* Not whole TCP header or malformed packet */ |
785 | if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) { |
786 | if (LOG_INVALID(net, IPPROTO_TCP)) |
787 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
788 | "nf_ct_tcp: truncated/malformed packet "); |
789 | return -NF_ACCEPT; |
790 | } |
791 | |
792 | /* Checksum invalid? Ignore. |
793 | * We skip checking packets on the outgoing path |
794 | * because the checksum is assumed to be correct. |
795 | */ |
796 | /* FIXME: Source route IP option packets --RR */ |
797 | if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && |
798 | nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) { |
799 | if (LOG_INVALID(net, IPPROTO_TCP)) |
800 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
801 | "nf_ct_tcp: bad TCP checksum "); |
802 | return -NF_ACCEPT; |
803 | } |
804 | |
805 | /* Check TCP flags. */ |
806 | tcpflags = (tcp_flag_byte(th) & ~(TCPHDR_ECE|TCPHDR_CWR|TCPHDR_PSH)); |
807 | if (!tcp_valid_flags[tcpflags]) { |
808 | if (LOG_INVALID(net, IPPROTO_TCP)) |
809 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
810 | "nf_ct_tcp: invalid TCP flag combination "); |
811 | return -NF_ACCEPT; |
812 | } |
813 | |
814 | return NF_ACCEPT; |
815 | } |
816 | |
817 | /* Returns verdict for packet, or -1 for invalid. */ |
818 | static int tcp_packet(struct nf_conn *ct, |
819 | const struct sk_buff *skb, |
820 | unsigned int dataoff, |
821 | enum ip_conntrack_info ctinfo, |
822 | u_int8_t pf, |
823 | unsigned int hooknum) |
824 | { |
825 | struct net *net = nf_ct_net(ct); |
826 | struct nf_conntrack_tuple *tuple; |
827 | enum tcp_conntrack new_state, old_state; |
828 | enum ip_conntrack_dir dir; |
829 | const struct tcphdr *th; |
830 | struct tcphdr _tcph; |
831 | unsigned long timeout; |
832 | unsigned int index; |
833 | |
834 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); |
835 | BUG_ON(th == NULL); |
836 | |
837 | spin_lock_bh(&ct->lock); |
838 | old_state = ct->proto.tcp.state; |
839 | dir = CTINFO2DIR(ctinfo); |
840 | index = get_conntrack_index(th); |
841 | new_state = tcp_conntracks[dir][index][old_state]; |
842 | tuple = &ct->tuplehash[dir].tuple; |
843 | |
844 | switch (new_state) { |
845 | case TCP_CONNTRACK_SYN_SENT: |
846 | if (old_state < TCP_CONNTRACK_TIME_WAIT) |
847 | break; |
848 | /* RFC 1122: "When a connection is closed actively, |
849 | * it MUST linger in TIME-WAIT state for a time 2xMSL |
850 | * (Maximum Segment Lifetime). However, it MAY accept |
851 | * a new SYN from the remote TCP to reopen the connection |
852 | * directly from TIME-WAIT state, if..." |
853 | * We ignore the conditions because we are in the |
854 | * TIME-WAIT state anyway. |
855 | * |
856 | * Handle aborted connections: we and the server |
857 | * think there is an existing connection but the client |
858 | * aborts it and starts a new one. |
859 | */ |
860 | if (((ct->proto.tcp.seen[dir].flags |
861 | | ct->proto.tcp.seen[!dir].flags) |
862 | & IP_CT_TCP_FLAG_CLOSE_INIT) |
863 | || (ct->proto.tcp.last_dir == dir |
864 | && ct->proto.tcp.last_index == TCP_RST_SET)) { |
865 | /* Attempt to reopen a closed/aborted connection. |
866 | * Delete this connection and look up again. */ |
867 | spin_unlock_bh(&ct->lock); |
868 | |
869 | /* Only repeat if we can actually remove the timer. |
870 | * Destruction may already be in progress in process |
871 | * context and we must give it a chance to terminate. |
872 | */ |
873 | if (nf_ct_kill(ct)) |
874 | return -NF_REPEAT; |
875 | return NF_DROP; |
876 | } |
877 | /* Fall through */ |
878 | case TCP_CONNTRACK_IGNORE: |
879 | /* Ignored packets: |
880 | * |
881 | * Our connection entry may be out of sync, so ignore |
882 | * packets which may signal the real connection between |
883 | * the client and the server. |
884 | * |
885 | * a) SYN in ORIGINAL |
886 | * b) SYN/ACK in REPLY |
887 | * c) ACK in reply direction after initial SYN in original. |
888 | * |
889 | * If the ignored packet is invalid, the receiver will send |
890 | * a RST we'll catch below. |
891 | */ |
892 | if (index == TCP_SYNACK_SET |
893 | && ct->proto.tcp.last_index == TCP_SYN_SET |
894 | && ct->proto.tcp.last_dir != dir |
895 | && ntohl(th->ack_seq) == ct->proto.tcp.last_end) { |
896 | /* b) This SYN/ACK acknowledges a SYN that we earlier |
897 | * ignored as invalid. This means that the client and |
898 | * the server are both in sync, while the firewall is |
899 | * not. We get in sync from the previously annotated |
900 | * values. |
901 | */ |
902 | old_state = TCP_CONNTRACK_SYN_SENT; |
903 | new_state = TCP_CONNTRACK_SYN_RECV; |
904 | ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_end = |
905 | ct->proto.tcp.last_end; |
906 | ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_maxend = |
907 | ct->proto.tcp.last_end; |
908 | ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_maxwin = |
909 | ct->proto.tcp.last_win == 0 ? |
910 | 1 : ct->proto.tcp.last_win; |
911 | ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_scale = |
912 | ct->proto.tcp.last_wscale; |
913 | ct->proto.tcp.seen[ct->proto.tcp.last_dir].flags = |
914 | ct->proto.tcp.last_flags; |
915 | memset(&ct->proto.tcp.seen[dir], 0, |
916 | sizeof(struct ip_ct_tcp_state)); |
917 | break; |
918 | } |
919 | ct->proto.tcp.last_index = index; |
920 | ct->proto.tcp.last_dir = dir; |
921 | ct->proto.tcp.last_seq = ntohl(th->seq); |
922 | ct->proto.tcp.last_end = |
923 | segment_seq_plus_len(ntohl(th->seq), skb->len, dataoff, th); |
924 | ct->proto.tcp.last_win = ntohs(th->window); |
925 | |
926 | /* a) This is a SYN in ORIGINAL. The client and the server |
927 | * may be in sync but we are not. In that case, we annotate |
928 | * the TCP options and let the packet go through. If it is a |
929 | * valid SYN packet, the server will reply with a SYN/ACK, and |
930 | * then we'll get in sync. Otherwise, the server ignores it. */ |
931 | if (index == TCP_SYN_SET && dir == IP_CT_DIR_ORIGINAL) { |
932 | struct ip_ct_tcp_state seen = {}; |
933 | |
934 | ct->proto.tcp.last_flags = |
935 | ct->proto.tcp.last_wscale = 0; |
936 | tcp_options(skb, dataoff, th, &seen); |
937 | if (seen.flags & IP_CT_TCP_FLAG_WINDOW_SCALE) { |
938 | ct->proto.tcp.last_flags |= |
939 | IP_CT_TCP_FLAG_WINDOW_SCALE; |
940 | ct->proto.tcp.last_wscale = seen.td_scale; |
941 | } |
942 | if (seen.flags & IP_CT_TCP_FLAG_SACK_PERM) { |
943 | ct->proto.tcp.last_flags |= |
944 | IP_CT_TCP_FLAG_SACK_PERM; |
945 | } |
946 | } |
947 | spin_unlock_bh(&ct->lock); |
948 | if (LOG_INVALID(net, IPPROTO_TCP)) |
949 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
950 | "nf_ct_tcp: invalid packet ignored "); |
951 | return NF_ACCEPT; |
952 | case TCP_CONNTRACK_MAX: |
953 | /* Invalid packet */ |
954 | pr_debug("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n", |
955 | dir, get_conntrack_index(th), old_state); |
956 | spin_unlock_bh(&ct->lock); |
957 | if (LOG_INVALID(net, IPPROTO_TCP)) |
958 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
959 | "nf_ct_tcp: invalid state "); |
960 | return -NF_ACCEPT; |
961 | case TCP_CONNTRACK_CLOSE: |
962 | if (index == TCP_RST_SET |
963 | && (ct->proto.tcp.seen[!dir].flags & IP_CT_TCP_FLAG_MAXACK_SET) |
964 | && before(ntohl(th->seq), ct->proto.tcp.seen[!dir].td_maxack)) { |
965 | /* Invalid RST */ |
966 | spin_unlock_bh(&ct->lock); |
967 | if (LOG_INVALID(net, IPPROTO_TCP)) |
968 | nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
969 | "nf_ct_tcp: invalid RST "); |
970 | return -NF_ACCEPT; |
971 | } |
972 | if (index == TCP_RST_SET |
973 | && ((test_bit(IPS_SEEN_REPLY_BIT, &ct->status) |
974 | && ct->proto.tcp.last_index == TCP_SYN_SET) |
975 | || (!test_bit(IPS_ASSURED_BIT, &ct->status) |
976 | && ct->proto.tcp.last_index == TCP_ACK_SET)) |
977 | && ntohl(th->ack_seq) == ct->proto.tcp.last_end) { |
978 | /* RST sent to invalid SYN or ACK we had let through |
979 | * at a) and c) above: |
980 | * |
981 | * a) SYN was in window then |
982 | * c) we hold a half-open connection. |
983 | * |
984 | * Delete our connection entry. |
985 | * We skip window checking, because packet might ACK |
986 | * segments we ignored. */ |
987 | goto in_window; |
988 | } |
989 | /* Just fall through */ |
990 | default: |
991 | /* Keep compilers happy. */ |
992 | break; |
993 | } |
994 | |
995 | if (!tcp_in_window(ct, &ct->proto.tcp, dir, index, |
996 | skb, dataoff, th, pf)) { |
997 | spin_unlock_bh(&ct->lock); |
998 | return -NF_ACCEPT; |
999 | } |
1000 | in_window: |
1001 | /* From now on we have got in-window packets */ |
1002 | ct->proto.tcp.last_index = index; |
1003 | ct->proto.tcp.last_dir = dir; |
1004 | |
1005 | pr_debug("tcp_conntracks: "); |
1006 | nf_ct_dump_tuple(tuple); |
1007 | pr_debug("syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n", |
1008 | (th->syn ? 1 : 0), (th->ack ? 1 : 0), |
1009 | (th->fin ? 1 : 0), (th->rst ? 1 : 0), |
1010 | old_state, new_state); |
1011 | |
1012 | ct->proto.tcp.state = new_state; |
1013 | if (old_state != new_state |
1014 | && new_state == TCP_CONNTRACK_FIN_WAIT) |
1015 | ct->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT; |
1016 | |
1017 | if (ct->proto.tcp.retrans >= nf_ct_tcp_max_retrans && |
1018 | tcp_timeouts[new_state] > nf_ct_tcp_timeout_max_retrans) |
1019 | timeout = nf_ct_tcp_timeout_max_retrans; |
1020 | else if ((ct->proto.tcp.seen[0].flags | ct->proto.tcp.seen[1].flags) & |
1021 | IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED && |
1022 | tcp_timeouts[new_state] > nf_ct_tcp_timeout_unacknowledged) |
1023 | timeout = nf_ct_tcp_timeout_unacknowledged; |
1024 | else |
1025 | timeout = tcp_timeouts[new_state]; |
1026 | spin_unlock_bh(&ct->lock); |
1027 | |
1028 | if (new_state != old_state) |
1029 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
1030 | |
1031 | if (!test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
1032 | /* If only reply is a RST, we can consider ourselves not to |
1033 | have an established connection: this is a fairly common |
1034 | problem case, so we can delete the conntrack |
1035 | immediately. --RR */ |
1036 | if (th->rst) { |
1037 | nf_ct_kill_acct(ct, ctinfo, skb); |
1038 | return NF_ACCEPT; |
1039 | } |
1040 | } else if (!test_bit(IPS_ASSURED_BIT, &ct->status) |
1041 | && (old_state == TCP_CONNTRACK_SYN_RECV |
1042 | || old_state == TCP_CONNTRACK_ESTABLISHED) |
1043 | && new_state == TCP_CONNTRACK_ESTABLISHED) { |
1044 | /* Set ASSURED if we see see valid ack in ESTABLISHED |
1045 | after SYN_RECV or a valid answer for a picked up |
1046 | connection. */ |
1047 | set_bit(IPS_ASSURED_BIT, &ct->status); |
1048 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
1049 | } |
1050 | nf_ct_refresh_acct(ct, ctinfo, skb, timeout); |
1051 | |
1052 | return NF_ACCEPT; |
1053 | } |
1054 | |
1055 | /* Called when a new connection for this protocol found. */ |
1056 | static bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb, |
1057 | unsigned int dataoff) |
1058 | { |
1059 | enum tcp_conntrack new_state; |
1060 | const struct tcphdr *th; |
1061 | struct tcphdr _tcph; |
1062 | const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[0]; |
1063 | const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[1]; |
1064 | |
1065 | th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph); |
1066 | BUG_ON(th == NULL); |
1067 | |
1068 | /* Don't need lock here: this conntrack not in circulation yet */ |
1069 | new_state |
1070 | = tcp_conntracks[0][get_conntrack_index(th)] |
1071 | [TCP_CONNTRACK_NONE]; |
1072 | |
1073 | /* Invalid: delete conntrack */ |
1074 | if (new_state >= TCP_CONNTRACK_MAX) { |
1075 | pr_debug("nf_ct_tcp: invalid new deleting.\n"); |
1076 | return false; |
1077 | } |
1078 | |
1079 | if (new_state == TCP_CONNTRACK_SYN_SENT) { |
1080 | /* SYN packet */ |
1081 | ct->proto.tcp.seen[0].td_end = |
1082 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
1083 | dataoff, th); |
1084 | ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
1085 | if (ct->proto.tcp.seen[0].td_maxwin == 0) |
1086 | ct->proto.tcp.seen[0].td_maxwin = 1; |
1087 | ct->proto.tcp.seen[0].td_maxend = |
1088 | ct->proto.tcp.seen[0].td_end; |
1089 | |
1090 | tcp_options(skb, dataoff, th, &ct->proto.tcp.seen[0]); |
1091 | ct->proto.tcp.seen[1].flags = 0; |
1092 | } else if (nf_ct_tcp_loose == 0) { |
1093 | /* Don't try to pick up connections. */ |
1094 | return false; |
1095 | } else { |
1096 | /* |
1097 | * We are in the middle of a connection, |
1098 | * its history is lost for us. |
1099 | * Let's try to use the data from the packet. |
1100 | */ |
1101 | ct->proto.tcp.seen[0].td_end = |
1102 | segment_seq_plus_len(ntohl(th->seq), skb->len, |
1103 | dataoff, th); |
1104 | ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window); |
1105 | if (ct->proto.tcp.seen[0].td_maxwin == 0) |
1106 | ct->proto.tcp.seen[0].td_maxwin = 1; |
1107 | ct->proto.tcp.seen[0].td_maxend = |
1108 | ct->proto.tcp.seen[0].td_end + |
1109 | ct->proto.tcp.seen[0].td_maxwin; |
1110 | ct->proto.tcp.seen[0].td_scale = 0; |
1111 | |
1112 | /* We assume SACK and liberal window checking to handle |
1113 | * window scaling */ |
1114 | ct->proto.tcp.seen[0].flags = |
1115 | ct->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM | |
1116 | IP_CT_TCP_FLAG_BE_LIBERAL; |
1117 | } |
1118 | |
1119 | ct->proto.tcp.seen[1].td_end = 0; |
1120 | ct->proto.tcp.seen[1].td_maxend = 0; |
1121 | ct->proto.tcp.seen[1].td_maxwin = 0; |
1122 | ct->proto.tcp.seen[1].td_scale = 0; |
1123 | |
1124 | /* tcp_packet will set them */ |
1125 | ct->proto.tcp.state = TCP_CONNTRACK_NONE; |
1126 | ct->proto.tcp.last_index = TCP_NONE_SET; |
1127 | |
1128 | pr_debug("tcp_new: sender end=%u maxend=%u maxwin=%u scale=%i " |
1129 | "receiver end=%u maxend=%u maxwin=%u scale=%i\n", |
1130 | sender->td_end, sender->td_maxend, sender->td_maxwin, |
1131 | sender->td_scale, |
1132 | receiver->td_end, receiver->td_maxend, receiver->td_maxwin, |
1133 | receiver->td_scale); |
1134 | return true; |
1135 | } |
1136 | |
1137 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
1138 | |
1139 | #include <linux/netfilter/nfnetlink.h> |
1140 | #include <linux/netfilter/nfnetlink_conntrack.h> |
1141 | |
1142 | static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
1143 | struct nf_conn *ct) |
1144 | { |
1145 | struct nlattr *nest_parms; |
1146 | struct nf_ct_tcp_flags tmp = {}; |
1147 | |
1148 | spin_lock_bh(&ct->lock); |
1149 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_TCP | NLA_F_NESTED); |
1150 | if (!nest_parms) |
1151 | goto nla_put_failure; |
1152 | |
1153 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_STATE, ct->proto.tcp.state); |
1154 | |
1155 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_WSCALE_ORIGINAL, |
1156 | ct->proto.tcp.seen[0].td_scale); |
1157 | |
1158 | NLA_PUT_U8(skb, CTA_PROTOINFO_TCP_WSCALE_REPLY, |
1159 | ct->proto.tcp.seen[1].td_scale); |
1160 | |
1161 | tmp.flags = ct->proto.tcp.seen[0].flags; |
1162 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_ORIGINAL, |
1163 | sizeof(struct nf_ct_tcp_flags), &tmp); |
1164 | |
1165 | tmp.flags = ct->proto.tcp.seen[1].flags; |
1166 | NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_REPLY, |
1167 | sizeof(struct nf_ct_tcp_flags), &tmp); |
1168 | spin_unlock_bh(&ct->lock); |
1169 | |
1170 | nla_nest_end(skb, nest_parms); |
1171 | |
1172 | return 0; |
1173 | |
1174 | nla_put_failure: |
1175 | spin_unlock_bh(&ct->lock); |
1176 | return -1; |
1177 | } |
1178 | |
1179 | static const struct nla_policy tcp_nla_policy[CTA_PROTOINFO_TCP_MAX+1] = { |
1180 | [CTA_PROTOINFO_TCP_STATE] = { .type = NLA_U8 }, |
1181 | [CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] = { .type = NLA_U8 }, |
1182 | [CTA_PROTOINFO_TCP_WSCALE_REPLY] = { .type = NLA_U8 }, |
1183 | [CTA_PROTOINFO_TCP_FLAGS_ORIGINAL] = { .len = sizeof(struct nf_ct_tcp_flags) }, |
1184 | [CTA_PROTOINFO_TCP_FLAGS_REPLY] = { .len = sizeof(struct nf_ct_tcp_flags) }, |
1185 | }; |
1186 | |
1187 | static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct) |
1188 | { |
1189 | struct nlattr *pattr = cda[CTA_PROTOINFO_TCP]; |
1190 | struct nlattr *tb[CTA_PROTOINFO_TCP_MAX+1]; |
1191 | int err; |
1192 | |
1193 | /* updates could not contain anything about the private |
1194 | * protocol info, in that case skip the parsing */ |
1195 | if (!pattr) |
1196 | return 0; |
1197 | |
1198 | err = nla_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, pattr, tcp_nla_policy); |
1199 | if (err < 0) |
1200 | return err; |
1201 | |
1202 | if (tb[CTA_PROTOINFO_TCP_STATE] && |
1203 | nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]) >= TCP_CONNTRACK_MAX) |
1204 | return -EINVAL; |
1205 | |
1206 | spin_lock_bh(&ct->lock); |
1207 | if (tb[CTA_PROTOINFO_TCP_STATE]) |
1208 | ct->proto.tcp.state = nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]); |
1209 | |
1210 | if (tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]) { |
1211 | struct nf_ct_tcp_flags *attr = |
1212 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]); |
1213 | ct->proto.tcp.seen[0].flags &= ~attr->mask; |
1214 | ct->proto.tcp.seen[0].flags |= attr->flags & attr->mask; |
1215 | } |
1216 | |
1217 | if (tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]) { |
1218 | struct nf_ct_tcp_flags *attr = |
1219 | nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]); |
1220 | ct->proto.tcp.seen[1].flags &= ~attr->mask; |
1221 | ct->proto.tcp.seen[1].flags |= attr->flags & attr->mask; |
1222 | } |
1223 | |
1224 | if (tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] && |
1225 | tb[CTA_PROTOINFO_TCP_WSCALE_REPLY] && |
1226 | ct->proto.tcp.seen[0].flags & IP_CT_TCP_FLAG_WINDOW_SCALE && |
1227 | ct->proto.tcp.seen[1].flags & IP_CT_TCP_FLAG_WINDOW_SCALE) { |
1228 | ct->proto.tcp.seen[0].td_scale = |
1229 | nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL]); |
1230 | ct->proto.tcp.seen[1].td_scale = |
1231 | nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_REPLY]); |
1232 | } |
1233 | spin_unlock_bh(&ct->lock); |
1234 | |
1235 | return 0; |
1236 | } |
1237 | |
1238 | static int tcp_nlattr_size(void) |
1239 | { |
1240 | return nla_total_size(0) /* CTA_PROTOINFO_TCP */ |
1241 | + nla_policy_len(tcp_nla_policy, CTA_PROTOINFO_TCP_MAX + 1); |
1242 | } |
1243 | |
1244 | static int tcp_nlattr_tuple_size(void) |
1245 | { |
1246 | return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); |
1247 | } |
1248 | #endif |
1249 | |
1250 | #ifdef CONFIG_SYSCTL |
1251 | static unsigned int tcp_sysctl_table_users; |
1252 | static struct ctl_table_header *tcp_sysctl_header; |
1253 | static struct ctl_table tcp_sysctl_table[] = { |
1254 | { |
1255 | .procname = "nf_conntrack_tcp_timeout_syn_sent", |
1256 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT], |
1257 | .maxlen = sizeof(unsigned int), |
1258 | .mode = 0644, |
1259 | .proc_handler = proc_dointvec_jiffies, |
1260 | }, |
1261 | { |
1262 | .procname = "nf_conntrack_tcp_timeout_syn_recv", |
1263 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV], |
1264 | .maxlen = sizeof(unsigned int), |
1265 | .mode = 0644, |
1266 | .proc_handler = proc_dointvec_jiffies, |
1267 | }, |
1268 | { |
1269 | .procname = "nf_conntrack_tcp_timeout_established", |
1270 | .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED], |
1271 | .maxlen = sizeof(unsigned int), |
1272 | .mode = 0644, |
1273 | .proc_handler = proc_dointvec_jiffies, |
1274 | }, |
1275 | { |
1276 | .procname = "nf_conntrack_tcp_timeout_fin_wait", |
1277 | .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT], |
1278 | .maxlen = sizeof(unsigned int), |
1279 | .mode = 0644, |
1280 | .proc_handler = proc_dointvec_jiffies, |
1281 | }, |
1282 | { |
1283 | .procname = "nf_conntrack_tcp_timeout_close_wait", |
1284 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT], |
1285 | .maxlen = sizeof(unsigned int), |
1286 | .mode = 0644, |
1287 | .proc_handler = proc_dointvec_jiffies, |
1288 | }, |
1289 | { |
1290 | .procname = "nf_conntrack_tcp_timeout_last_ack", |
1291 | .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK], |
1292 | .maxlen = sizeof(unsigned int), |
1293 | .mode = 0644, |
1294 | .proc_handler = proc_dointvec_jiffies, |
1295 | }, |
1296 | { |
1297 | .procname = "nf_conntrack_tcp_timeout_time_wait", |
1298 | .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT], |
1299 | .maxlen = sizeof(unsigned int), |
1300 | .mode = 0644, |
1301 | .proc_handler = proc_dointvec_jiffies, |
1302 | }, |
1303 | { |
1304 | .procname = "nf_conntrack_tcp_timeout_close", |
1305 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE], |
1306 | .maxlen = sizeof(unsigned int), |
1307 | .mode = 0644, |
1308 | .proc_handler = proc_dointvec_jiffies, |
1309 | }, |
1310 | { |
1311 | .procname = "nf_conntrack_tcp_timeout_max_retrans", |
1312 | .data = &nf_ct_tcp_timeout_max_retrans, |
1313 | .maxlen = sizeof(unsigned int), |
1314 | .mode = 0644, |
1315 | .proc_handler = proc_dointvec_jiffies, |
1316 | }, |
1317 | { |
1318 | .procname = "nf_conntrack_tcp_timeout_unacknowledged", |
1319 | .data = &nf_ct_tcp_timeout_unacknowledged, |
1320 | .maxlen = sizeof(unsigned int), |
1321 | .mode = 0644, |
1322 | .proc_handler = proc_dointvec_jiffies, |
1323 | }, |
1324 | { |
1325 | .procname = "nf_conntrack_tcp_loose", |
1326 | .data = &nf_ct_tcp_loose, |
1327 | .maxlen = sizeof(unsigned int), |
1328 | .mode = 0644, |
1329 | .proc_handler = proc_dointvec, |
1330 | }, |
1331 | { |
1332 | .procname = "nf_conntrack_tcp_be_liberal", |
1333 | .data = &nf_ct_tcp_be_liberal, |
1334 | .maxlen = sizeof(unsigned int), |
1335 | .mode = 0644, |
1336 | .proc_handler = proc_dointvec, |
1337 | }, |
1338 | { |
1339 | .procname = "nf_conntrack_tcp_max_retrans", |
1340 | .data = &nf_ct_tcp_max_retrans, |
1341 | .maxlen = sizeof(unsigned int), |
1342 | .mode = 0644, |
1343 | .proc_handler = proc_dointvec, |
1344 | }, |
1345 | { } |
1346 | }; |
1347 | |
1348 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
1349 | static struct ctl_table tcp_compat_sysctl_table[] = { |
1350 | { |
1351 | .procname = "ip_conntrack_tcp_timeout_syn_sent", |
1352 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT], |
1353 | .maxlen = sizeof(unsigned int), |
1354 | .mode = 0644, |
1355 | .proc_handler = proc_dointvec_jiffies, |
1356 | }, |
1357 | { |
1358 | .procname = "ip_conntrack_tcp_timeout_syn_sent2", |
1359 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT2], |
1360 | .maxlen = sizeof(unsigned int), |
1361 | .mode = 0644, |
1362 | .proc_handler = proc_dointvec_jiffies, |
1363 | }, |
1364 | { |
1365 | .procname = "ip_conntrack_tcp_timeout_syn_recv", |
1366 | .data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV], |
1367 | .maxlen = sizeof(unsigned int), |
1368 | .mode = 0644, |
1369 | .proc_handler = proc_dointvec_jiffies, |
1370 | }, |
1371 | { |
1372 | .procname = "ip_conntrack_tcp_timeout_established", |
1373 | .data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED], |
1374 | .maxlen = sizeof(unsigned int), |
1375 | .mode = 0644, |
1376 | .proc_handler = proc_dointvec_jiffies, |
1377 | }, |
1378 | { |
1379 | .procname = "ip_conntrack_tcp_timeout_fin_wait", |
1380 | .data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT], |
1381 | .maxlen = sizeof(unsigned int), |
1382 | .mode = 0644, |
1383 | .proc_handler = proc_dointvec_jiffies, |
1384 | }, |
1385 | { |
1386 | .procname = "ip_conntrack_tcp_timeout_close_wait", |
1387 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT], |
1388 | .maxlen = sizeof(unsigned int), |
1389 | .mode = 0644, |
1390 | .proc_handler = proc_dointvec_jiffies, |
1391 | }, |
1392 | { |
1393 | .procname = "ip_conntrack_tcp_timeout_last_ack", |
1394 | .data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK], |
1395 | .maxlen = sizeof(unsigned int), |
1396 | .mode = 0644, |
1397 | .proc_handler = proc_dointvec_jiffies, |
1398 | }, |
1399 | { |
1400 | .procname = "ip_conntrack_tcp_timeout_time_wait", |
1401 | .data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT], |
1402 | .maxlen = sizeof(unsigned int), |
1403 | .mode = 0644, |
1404 | .proc_handler = proc_dointvec_jiffies, |
1405 | }, |
1406 | { |
1407 | .procname = "ip_conntrack_tcp_timeout_close", |
1408 | .data = &tcp_timeouts[TCP_CONNTRACK_CLOSE], |
1409 | .maxlen = sizeof(unsigned int), |
1410 | .mode = 0644, |
1411 | .proc_handler = proc_dointvec_jiffies, |
1412 | }, |
1413 | { |
1414 | .procname = "ip_conntrack_tcp_timeout_max_retrans", |
1415 | .data = &nf_ct_tcp_timeout_max_retrans, |
1416 | .maxlen = sizeof(unsigned int), |
1417 | .mode = 0644, |
1418 | .proc_handler = proc_dointvec_jiffies, |
1419 | }, |
1420 | { |
1421 | .procname = "ip_conntrack_tcp_loose", |
1422 | .data = &nf_ct_tcp_loose, |
1423 | .maxlen = sizeof(unsigned int), |
1424 | .mode = 0644, |
1425 | .proc_handler = proc_dointvec, |
1426 | }, |
1427 | { |
1428 | .procname = "ip_conntrack_tcp_be_liberal", |
1429 | .data = &nf_ct_tcp_be_liberal, |
1430 | .maxlen = sizeof(unsigned int), |
1431 | .mode = 0644, |
1432 | .proc_handler = proc_dointvec, |
1433 | }, |
1434 | { |
1435 | .procname = "ip_conntrack_tcp_max_retrans", |
1436 | .data = &nf_ct_tcp_max_retrans, |
1437 | .maxlen = sizeof(unsigned int), |
1438 | .mode = 0644, |
1439 | .proc_handler = proc_dointvec, |
1440 | }, |
1441 | { } |
1442 | }; |
1443 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
1444 | #endif /* CONFIG_SYSCTL */ |
1445 | |
1446 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly = |
1447 | { |
1448 | .l3proto = PF_INET, |
1449 | .l4proto = IPPROTO_TCP, |
1450 | .name = "tcp", |
1451 | .pkt_to_tuple = tcp_pkt_to_tuple, |
1452 | .invert_tuple = tcp_invert_tuple, |
1453 | .print_tuple = tcp_print_tuple, |
1454 | .print_conntrack = tcp_print_conntrack, |
1455 | .packet = tcp_packet, |
1456 | .new = tcp_new, |
1457 | .error = tcp_error, |
1458 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
1459 | .to_nlattr = tcp_to_nlattr, |
1460 | .nlattr_size = tcp_nlattr_size, |
1461 | .from_nlattr = nlattr_to_tcp, |
1462 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
1463 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
1464 | .nlattr_tuple_size = tcp_nlattr_tuple_size, |
1465 | .nla_policy = nf_ct_port_nla_policy, |
1466 | #endif |
1467 | #ifdef CONFIG_SYSCTL |
1468 | .ctl_table_users = &tcp_sysctl_table_users, |
1469 | .ctl_table_header = &tcp_sysctl_header, |
1470 | .ctl_table = tcp_sysctl_table, |
1471 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
1472 | .ctl_compat_table = tcp_compat_sysctl_table, |
1473 | #endif |
1474 | #endif |
1475 | }; |
1476 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4); |
1477 | |
1478 | struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly = |
1479 | { |
1480 | .l3proto = PF_INET6, |
1481 | .l4proto = IPPROTO_TCP, |
1482 | .name = "tcp", |
1483 | .pkt_to_tuple = tcp_pkt_to_tuple, |
1484 | .invert_tuple = tcp_invert_tuple, |
1485 | .print_tuple = tcp_print_tuple, |
1486 | .print_conntrack = tcp_print_conntrack, |
1487 | .packet = tcp_packet, |
1488 | .new = tcp_new, |
1489 | .error = tcp_error, |
1490 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
1491 | .to_nlattr = tcp_to_nlattr, |
1492 | .nlattr_size = tcp_nlattr_size, |
1493 | .from_nlattr = nlattr_to_tcp, |
1494 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
1495 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
1496 | .nlattr_tuple_size = tcp_nlattr_tuple_size, |
1497 | .nla_policy = nf_ct_port_nla_policy, |
1498 | #endif |
1499 | #ifdef CONFIG_SYSCTL |
1500 | .ctl_table_users = &tcp_sysctl_table_users, |
1501 | .ctl_table_header = &tcp_sysctl_header, |
1502 | .ctl_table = tcp_sysctl_table, |
1503 | #endif |
1504 | }; |
1505 | EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6); |
1506 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9