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import PULS_20160108
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / netfilter / nf_conntrack_proto_tcp.c
1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
3 * (C) 2002-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
4 * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <linux/types.h>
12 #include <linux/timer.h>
13 #include <linux/module.h>
14 #include <linux/in.h>
15 #include <linux/tcp.h>
16 #include <linux/spinlock.h>
17 #include <linux/skbuff.h>
18 #include <linux/ipv6.h>
19 #include <net/ip6_checksum.h>
20 #include <asm/unaligned.h>
21
22 #include <net/tcp.h>
23
24 #include <linux/netfilter.h>
25 #include <linux/netfilter_ipv4.h>
26 #include <linux/netfilter_ipv6.h>
27 #include <net/netfilter/nf_conntrack.h>
28 #include <net/netfilter/nf_conntrack_l4proto.h>
29 #include <net/netfilter/nf_conntrack_ecache.h>
30 #include <net/netfilter/nf_log.h>
31 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
32 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
33
34 /* "Be conservative in what you do,
35 be liberal in what you accept from others."
36 If it's non-zero, we mark only out of window RST segments as INVALID. */
37 static int nf_ct_tcp_be_liberal __read_mostly = 0;
38
39 /* If it is set to zero, we disable picking up already established
40 connections. */
41 static int nf_ct_tcp_loose __read_mostly = 1;
42
43 /* Max number of the retransmitted packets without receiving an (acceptable)
44 ACK from the destination. If this number is reached, a shorter timer
45 will be started. */
46 static int nf_ct_tcp_max_retrans __read_mostly = 3;
47
48 /*if it is set to one,we disable check tcp ack or sequence number is in window*/
49 static int nf_ct_tcp_no_window_check __read_mostly = 0;
50 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
51 closely. They're more complex. --RR */
52
53 static const char *const tcp_conntrack_names[] = {
54 "NONE",
55 "SYN_SENT",
56 "SYN_RECV",
57 "ESTABLISHED",
58 "FIN_WAIT",
59 "CLOSE_WAIT",
60 "LAST_ACK",
61 "TIME_WAIT",
62 "CLOSE",
63 "SYN_SENT2",
64 };
65
66 #define SECS * HZ
67 #define MINS * 60 SECS
68 #define HOURS * 60 MINS
69 #define DAYS * 24 HOURS
70
71 static unsigned int tcp_timeouts[TCP_CONNTRACK_TIMEOUT_MAX] __read_mostly = {
72 [TCP_CONNTRACK_SYN_SENT] = 2 MINS,
73 [TCP_CONNTRACK_SYN_RECV] = 60 SECS,
74 [TCP_CONNTRACK_ESTABLISHED] = 5 DAYS,
75 [TCP_CONNTRACK_FIN_WAIT] = 2 MINS,
76 [TCP_CONNTRACK_CLOSE_WAIT] = 60 SECS,
77 [TCP_CONNTRACK_LAST_ACK] = 30 SECS,
78 [TCP_CONNTRACK_TIME_WAIT] = 2 MINS,
79 [TCP_CONNTRACK_CLOSE] = 10 SECS,
80 [TCP_CONNTRACK_SYN_SENT2] = 2 MINS,
81 /* RFC1122 says the R2 limit should be at least 100 seconds.
82 Linux uses 15 packets as limit, which corresponds
83 to ~13-30min depending on RTO. */
84 [TCP_CONNTRACK_RETRANS] = 5 MINS,
85 [TCP_CONNTRACK_UNACK] = 5 MINS,
86 };
87
88 #define sNO TCP_CONNTRACK_NONE
89 #define sSS TCP_CONNTRACK_SYN_SENT
90 #define sSR TCP_CONNTRACK_SYN_RECV
91 #define sES TCP_CONNTRACK_ESTABLISHED
92 #define sFW TCP_CONNTRACK_FIN_WAIT
93 #define sCW TCP_CONNTRACK_CLOSE_WAIT
94 #define sLA TCP_CONNTRACK_LAST_ACK
95 #define sTW TCP_CONNTRACK_TIME_WAIT
96 #define sCL TCP_CONNTRACK_CLOSE
97 #define sS2 TCP_CONNTRACK_SYN_SENT2
98 #define sIV TCP_CONNTRACK_MAX
99 #define sIG TCP_CONNTRACK_IGNORE
100
101 /* What TCP flags are set from RST/SYN/FIN/ACK. */
102 enum tcp_bit_set {
103 TCP_SYN_SET,
104 TCP_SYNACK_SET,
105 TCP_FIN_SET,
106 TCP_ACK_SET,
107 TCP_RST_SET,
108 TCP_NONE_SET,
109 };
110
111 /*
112 * The TCP state transition table needs a few words...
113 *
114 * We are the man in the middle. All the packets go through us
115 * but might get lost in transit to the destination.
116 * It is assumed that the destinations can't receive segments
117 * we haven't seen.
118 *
119 * The checked segment is in window, but our windows are *not*
120 * equivalent with the ones of the sender/receiver. We always
121 * try to guess the state of the current sender.
122 *
123 * The meaning of the states are:
124 *
125 * NONE: initial state
126 * SYN_SENT: SYN-only packet seen
127 * SYN_SENT2: SYN-only packet seen from reply dir, simultaneous open
128 * SYN_RECV: SYN-ACK packet seen
129 * ESTABLISHED: ACK packet seen
130 * FIN_WAIT: FIN packet seen
131 * CLOSE_WAIT: ACK seen (after FIN)
132 * LAST_ACK: FIN seen (after FIN)
133 * TIME_WAIT: last ACK seen
134 * CLOSE: closed connection (RST)
135 *
136 * Packets marked as IGNORED (sIG):
137 * if they may be either invalid or valid
138 * and the receiver may send back a connection
139 * closing RST or a SYN/ACK.
140 *
141 * Packets marked as INVALID (sIV):
142 * if we regard them as truly invalid packets
143 */
144 static const u8 tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = {
145 {
146 /* ORIGINAL */
147 /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
148 /*syn*/ { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sS2 },
149 /*
150 * sNO -> sSS Initialize a new connection
151 * sSS -> sSS Retransmitted SYN
152 * sS2 -> sS2 Late retransmitted SYN
153 * sSR -> sIG
154 * sES -> sIG Error: SYNs in window outside the SYN_SENT state
155 * are errors. Receiver will reply with RST
156 * and close the connection.
157 * Or we are not in sync and hold a dead connection.
158 * sFW -> sIG
159 * sCW -> sIG
160 * sLA -> sIG
161 * sTW -> sSS Reopened connection (RFC 1122).
162 * sCL -> sSS
163 */
164 /* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
165 /*synack*/ { sIV, sIV, sSR, sIV, sIV, sIV, sIV, sIV, sIV, sSR },
166 /*
167 * sNO -> sIV Too late and no reason to do anything
168 * sSS -> sIV Client can't send SYN and then SYN/ACK
169 * sS2 -> sSR SYN/ACK sent to SYN2 in simultaneous open
170 * sSR -> sSR Late retransmitted SYN/ACK in simultaneous open
171 * sES -> sIV Invalid SYN/ACK packets sent by the client
172 * sFW -> sIV
173 * sCW -> sIV
174 * sLA -> sIV
175 * sTW -> sIV
176 * sCL -> sIV
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, sIG, sIG, sIG, sIG, sIG, sIG, sIG, sSR },
231 /*
232 * sSS -> sSR Standard open.
233 * sS2 -> sSR Simultaneous open
234 * sSR -> sIG Retransmitted SYN/ACK, ignore it.
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 inline struct nf_tcp_net *tcp_pernet(struct net *net)
275 {
276 return &net->ct.nf_ct_proto.tcp;
277 }
278
279 static bool tcp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
280 struct nf_conntrack_tuple *tuple)
281 {
282 const struct tcphdr *hp;
283 struct tcphdr _hdr;
284
285 /* Actually only need first 8 bytes. */
286 hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
287 if (hp == NULL)
288 return false;
289
290 tuple->src.u.tcp.port = hp->source;
291 tuple->dst.u.tcp.port = hp->dest;
292
293 return true;
294 }
295
296 static bool tcp_invert_tuple(struct nf_conntrack_tuple *tuple,
297 const struct nf_conntrack_tuple *orig)
298 {
299 tuple->src.u.tcp.port = orig->dst.u.tcp.port;
300 tuple->dst.u.tcp.port = orig->src.u.tcp.port;
301 return true;
302 }
303
304 /* Print out the per-protocol part of the tuple. */
305 static int tcp_print_tuple(struct seq_file *s,
306 const struct nf_conntrack_tuple *tuple)
307 {
308 return seq_printf(s, "sport=%hu dport=%hu ",
309 ntohs(tuple->src.u.tcp.port),
310 ntohs(tuple->dst.u.tcp.port));
311 }
312
313 /* Print out the private part of the conntrack. */
314 static int tcp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
315 {
316 enum tcp_conntrack state;
317
318 spin_lock_bh(&ct->lock);
319 state = ct->proto.tcp.state;
320 spin_unlock_bh(&ct->lock);
321
322 return seq_printf(s, "%s ", tcp_conntrack_names[state]);
323 }
324
325 static unsigned int get_conntrack_index(const struct tcphdr *tcph)
326 {
327 if (tcph->rst) return TCP_RST_SET;
328 else if (tcph->syn) return (tcph->ack ? TCP_SYNACK_SET : TCP_SYN_SET);
329 else if (tcph->fin) return TCP_FIN_SET;
330 else if (tcph->ack) return TCP_ACK_SET;
331 else return TCP_NONE_SET;
332 }
333
334 /* TCP connection tracking based on 'Real Stateful TCP Packet Filtering
335 in IP Filter' by Guido van Rooij.
336
337 http://www.sane.nl/events/sane2000/papers.html
338 http://www.darkart.com/mirrors/www.obfuscation.org/ipf/
339
340 The boundaries and the conditions are changed according to RFC793:
341 the packet must intersect the window (i.e. segments may be
342 after the right or before the left edge) and thus receivers may ACK
343 segments after the right edge of the window.
344
345 td_maxend = max(sack + max(win,1)) seen in reply packets
346 td_maxwin = max(max(win, 1)) + (sack - ack) seen in sent packets
347 td_maxwin += seq + len - sender.td_maxend
348 if seq + len > sender.td_maxend
349 td_end = max(seq + len) seen in sent packets
350
351 I. Upper bound for valid data: seq <= sender.td_maxend
352 II. Lower bound for valid data: seq + len >= sender.td_end - receiver.td_maxwin
353 III. Upper bound for valid (s)ack: sack <= receiver.td_end
354 IV. Lower bound for valid (s)ack: sack >= receiver.td_end - MAXACKWINDOW
355
356 where sack is the highest right edge of sack block found in the packet
357 or ack in the case of packet without SACK option.
358
359 The upper bound limit for a valid (s)ack is not ignored -
360 we doesn't have to deal with fragments.
361 */
362
363 static inline __u32 segment_seq_plus_len(__u32 seq,
364 size_t len,
365 unsigned int dataoff,
366 const struct tcphdr *tcph)
367 {
368 /* XXX Should I use payload length field in IP/IPv6 header ?
369 * - YK */
370 return (seq + len - dataoff - tcph->doff*4
371 + (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0));
372 }
373
374 /* Fixme: what about big packets? */
375 #define MAXACKWINCONST 66000
376 #define MAXACKWINDOW(sender) \
377 ((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin \
378 : MAXACKWINCONST)
379
380 /*
381 * Simplified tcp_parse_options routine from tcp_input.c
382 */
383 static void tcp_options(const struct sk_buff *skb,
384 unsigned int dataoff,
385 const struct tcphdr *tcph,
386 struct ip_ct_tcp_state *state)
387 {
388 unsigned char buff[(15 * 4) - sizeof(struct tcphdr)];
389 const unsigned char *ptr;
390 int length = (tcph->doff*4) - sizeof(struct tcphdr);
391
392 if (!length)
393 return;
394
395 ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr),
396 length, buff);
397 BUG_ON(ptr == NULL);
398
399 state->td_scale =
400 state->flags = 0;
401
402 while (length > 0) {
403 int opcode=*ptr++;
404 int opsize;
405
406 switch (opcode) {
407 case TCPOPT_EOL:
408 return;
409 case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */
410 length--;
411 continue;
412 default:
413 opsize=*ptr++;
414 if (opsize < 2) /* "silly options" */
415 return;
416 if (opsize > length)
417 return; /* don't parse partial options */
418
419 if (opcode == TCPOPT_SACK_PERM
420 && opsize == TCPOLEN_SACK_PERM)
421 state->flags |= IP_CT_TCP_FLAG_SACK_PERM;
422 else if (opcode == TCPOPT_WINDOW
423 && opsize == TCPOLEN_WINDOW) {
424 state->td_scale = *(u_int8_t *)ptr;
425
426 if (state->td_scale > 14) {
427 /* See RFC1323 */
428 state->td_scale = 14;
429 }
430 state->flags |=
431 IP_CT_TCP_FLAG_WINDOW_SCALE;
432 }
433 ptr += opsize - 2;
434 length -= opsize;
435 }
436 }
437 }
438
439 static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff,
440 const struct tcphdr *tcph, __u32 *sack)
441 {
442 unsigned char buff[(15 * 4) - sizeof(struct tcphdr)];
443 const unsigned char *ptr;
444 int length = (tcph->doff*4) - sizeof(struct tcphdr);
445 __u32 tmp;
446
447 if (!length)
448 return;
449
450 ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr),
451 length, buff);
452 BUG_ON(ptr == NULL);
453
454 /* Fast path for timestamp-only option */
455 if (length == TCPOLEN_TSTAMP_ALIGNED
456 && *(__be32 *)ptr == htonl((TCPOPT_NOP << 24)
457 | (TCPOPT_NOP << 16)
458 | (TCPOPT_TIMESTAMP << 8)
459 | TCPOLEN_TIMESTAMP))
460 return;
461
462 while (length > 0) {
463 int opcode = *ptr++;
464 int opsize, i;
465
466 switch (opcode) {
467 case TCPOPT_EOL:
468 return;
469 case TCPOPT_NOP: /* Ref: RFC 793 section 3.1 */
470 length--;
471 continue;
472 default:
473 opsize = *ptr++;
474 if (opsize < 2) /* "silly options" */
475 return;
476 if (opsize > length)
477 return; /* don't parse partial options */
478
479 if (opcode == TCPOPT_SACK
480 && opsize >= (TCPOLEN_SACK_BASE
481 + TCPOLEN_SACK_PERBLOCK)
482 && !((opsize - TCPOLEN_SACK_BASE)
483 % TCPOLEN_SACK_PERBLOCK)) {
484 for (i = 0;
485 i < (opsize - TCPOLEN_SACK_BASE);
486 i += TCPOLEN_SACK_PERBLOCK) {
487 tmp = get_unaligned_be32((__be32 *)(ptr+i)+1);
488
489 if (after(tmp, *sack))
490 *sack = tmp;
491 }
492 return;
493 }
494 ptr += opsize - 2;
495 length -= opsize;
496 }
497 }
498 }
499
500 #ifdef CONFIG_NF_NAT_NEEDED
501 static inline s16 nat_offset(const struct nf_conn *ct,
502 enum ip_conntrack_dir dir,
503 u32 seq)
504 {
505 typeof(nf_ct_nat_offset) get_offset = rcu_dereference(nf_ct_nat_offset);
506
507 return get_offset != NULL ? get_offset(ct, dir, seq) : 0;
508 }
509 #define NAT_OFFSET(ct, dir, seq) \
510 (nat_offset(ct, dir, seq))
511 #else
512 #define NAT_OFFSET(ct, dir, seq) 0
513 #endif
514
515 static bool tcp_in_window(const struct nf_conn *ct,
516 struct ip_ct_tcp *state,
517 enum ip_conntrack_dir dir,
518 unsigned int index,
519 const struct sk_buff *skb,
520 unsigned int dataoff,
521 const struct tcphdr *tcph,
522 u_int8_t pf)
523 {
524 struct net *net = nf_ct_net(ct);
525 struct nf_tcp_net *tn = tcp_pernet(net);
526 struct ip_ct_tcp_state *sender = &state->seen[dir];
527 struct ip_ct_tcp_state *receiver = &state->seen[!dir];
528 const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
529 __u32 seq, ack, sack, end, win, swin;
530 s16 receiver_offset;
531 bool res;
532
533 if( nf_ct_tcp_no_window_check )
534 {
535 return true;
536 }
537 /*
538 * Get the required data from the packet.
539 */
540 seq = ntohl(tcph->seq);
541 ack = sack = ntohl(tcph->ack_seq);
542 win = ntohs(tcph->window);
543 end = segment_seq_plus_len(seq, skb->len, dataoff, tcph);
544
545 if (receiver->flags & IP_CT_TCP_FLAG_SACK_PERM)
546 tcp_sack(skb, dataoff, tcph, &sack);
547
548 /* Take into account NAT sequence number mangling */
549 receiver_offset = NAT_OFFSET(ct, !dir, ack - 1);
550 ack -= receiver_offset;
551 sack -= receiver_offset;
552
553 pr_debug("tcp_in_window: START\n");
554 pr_debug("tcp_in_window: ");
555 nf_ct_dump_tuple(tuple);
556 pr_debug("seq=%u ack=%u+(%d) sack=%u+(%d) win=%u end=%u\n",
557 seq, ack, receiver_offset, sack, receiver_offset, win, end);
558 pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
559 "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
560 sender->td_end, sender->td_maxend, sender->td_maxwin,
561 sender->td_scale,
562 receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
563 receiver->td_scale);
564
565 if (sender->td_maxwin == 0) {
566 /*
567 * Initialize sender data.
568 */
569 if (tcph->syn) {
570 /*
571 * SYN-ACK in reply to a SYN
572 * or SYN from reply direction in simultaneous open.
573 */
574 sender->td_end =
575 sender->td_maxend = end;
576 sender->td_maxwin = (win == 0 ? 1 : win);
577
578 tcp_options(skb, dataoff, tcph, sender);
579 /*
580 * RFC 1323:
581 * Both sides must send the Window Scale option
582 * to enable window scaling in either direction.
583 */
584 if (!(sender->flags & IP_CT_TCP_FLAG_WINDOW_SCALE
585 && receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE))
586 sender->td_scale =
587 receiver->td_scale = 0;
588 if (!tcph->ack)
589 /* Simultaneous open */
590 return true;
591 } else {
592 /*
593 * We are in the middle of a connection,
594 * its history is lost for us.
595 * Let's try to use the data from the packet.
596 */
597 sender->td_end = end;
598 swin = win << sender->td_scale;
599 sender->td_maxwin = (swin == 0 ? 1 : swin);
600 sender->td_maxend = end + sender->td_maxwin;
601 /*
602 * We haven't seen traffic in the other direction yet
603 * but we have to tweak window tracking to pass III
604 * and IV until that happens.
605 */
606 if (receiver->td_maxwin == 0)
607 receiver->td_end = receiver->td_maxend = sack;
608 }
609 } else if (((state->state == TCP_CONNTRACK_SYN_SENT
610 && dir == IP_CT_DIR_ORIGINAL)
611 || (state->state == TCP_CONNTRACK_SYN_RECV
612 && dir == IP_CT_DIR_REPLY))
613 && after(end, sender->td_end)) {
614 /*
615 * RFC 793: "if a TCP is reinitialized ... then it need
616 * not wait at all; it must only be sure to use sequence
617 * numbers larger than those recently used."
618 */
619 sender->td_end =
620 sender->td_maxend = end;
621 sender->td_maxwin = (win == 0 ? 1 : win);
622
623 tcp_options(skb, dataoff, tcph, sender);
624 }
625
626 if (!(tcph->ack)) {
627 /*
628 * If there is no ACK, just pretend it was set and OK.
629 */
630 ack = sack = receiver->td_end;
631 } else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) ==
632 (TCP_FLAG_ACK|TCP_FLAG_RST))
633 && (ack == 0)) {
634 /*
635 * Broken TCP stacks, that set ACK in RST packets as well
636 * with zero ack value.
637 */
638 ack = sack = receiver->td_end;
639 }
640
641 if (tcph->rst && seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT)
642 /*
643 * RST sent answering SYN.
644 */
645 seq = end = sender->td_end;
646
647 pr_debug("tcp_in_window: ");
648 nf_ct_dump_tuple(tuple);
649 pr_debug("seq=%u ack=%u+(%d) sack=%u+(%d) win=%u end=%u\n",
650 seq, ack, receiver_offset, sack, receiver_offset, win, end);
651 pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
652 "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
653 sender->td_end, sender->td_maxend, sender->td_maxwin,
654 sender->td_scale,
655 receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
656 receiver->td_scale);
657
658 pr_debug("tcp_in_window: I=%i II=%i III=%i IV=%i\n",
659 before(seq, sender->td_maxend + 1),
660 after(end, sender->td_end - receiver->td_maxwin - 1),
661 before(sack, receiver->td_end + 1),
662 after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1));
663
664 if (before(seq, sender->td_maxend + 1) &&
665 after(end, sender->td_end - receiver->td_maxwin - 1) &&
666 before(sack, receiver->td_end + 1) &&
667 after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1)) {
668 /*
669 * Take into account window scaling (RFC 1323).
670 */
671 if (!tcph->syn)
672 win <<= sender->td_scale;
673
674 /*
675 * Update sender data.
676 */
677 swin = win + (sack - ack);
678 if (sender->td_maxwin < swin)
679 sender->td_maxwin = swin;
680 if (after(end, sender->td_end)) {
681 sender->td_end = end;
682 sender->flags |= IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED;
683 }
684 if (tcph->ack) {
685 if (!(sender->flags & IP_CT_TCP_FLAG_MAXACK_SET)) {
686 sender->td_maxack = ack;
687 sender->flags |= IP_CT_TCP_FLAG_MAXACK_SET;
688 } else if (after(ack, sender->td_maxack))
689 sender->td_maxack = ack;
690 }
691
692 /*
693 * Update receiver data.
694 */
695 if (receiver->td_maxwin != 0 && after(end, sender->td_maxend))
696 receiver->td_maxwin += end - sender->td_maxend;
697 if (after(sack + win, receiver->td_maxend - 1)) {
698 receiver->td_maxend = sack + win;
699 if (win == 0)
700 receiver->td_maxend++;
701 }
702 if (ack == receiver->td_end)
703 receiver->flags &= ~IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED;
704
705 /*
706 * Check retransmissions.
707 */
708 if (index == TCP_ACK_SET) {
709 if (state->last_dir == dir
710 && state->last_seq == seq
711 && state->last_ack == ack
712 && state->last_end == end
713 && state->last_win == win)
714 state->retrans++;
715 else {
716 state->last_dir = dir;
717 state->last_seq = seq;
718 state->last_ack = ack;
719 state->last_end = end;
720 state->last_win = win;
721 state->retrans = 0;
722 }
723 }
724 res = true;
725 } else {
726 res = false;
727 if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL ||
728 tn->tcp_be_liberal)
729 res = true;
730 if (!res && LOG_INVALID(net, IPPROTO_TCP))
731 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
732 "nf_ct_tcp: %s ",
733 before(seq, sender->td_maxend + 1) ?
734 after(end, sender->td_end - receiver->td_maxwin - 1) ?
735 before(sack, receiver->td_end + 1) ?
736 after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1) ? "BUG"
737 : "ACK is under the lower bound (possible overly delayed ACK)"
738 : "ACK is over the upper bound (ACKed data not seen yet)"
739 : "SEQ is under the lower bound (already ACKed data retransmitted)"
740 : "SEQ is over the upper bound (over the window of the receiver)");
741 }
742
743 pr_debug("tcp_in_window: res=%u sender end=%u maxend=%u maxwin=%u "
744 "receiver end=%u maxend=%u maxwin=%u\n",
745 res, sender->td_end, sender->td_maxend, sender->td_maxwin,
746 receiver->td_end, receiver->td_maxend, receiver->td_maxwin);
747
748 return res;
749 }
750
751 /* table of valid flag combinations - PUSH, ECE and CWR are always valid */
752 static const u8 tcp_valid_flags[(TCPHDR_FIN|TCPHDR_SYN|TCPHDR_RST|TCPHDR_ACK|
753 TCPHDR_URG) + 1] =
754 {
755 [TCPHDR_SYN] = 1,
756 [TCPHDR_SYN|TCPHDR_URG] = 1,
757 [TCPHDR_SYN|TCPHDR_ACK] = 1,
758 [TCPHDR_RST] = 1,
759 [TCPHDR_RST|TCPHDR_ACK] = 1,
760 [TCPHDR_FIN|TCPHDR_ACK] = 1,
761 [TCPHDR_FIN|TCPHDR_ACK|TCPHDR_URG] = 1,
762 [TCPHDR_ACK] = 1,
763 [TCPHDR_ACK|TCPHDR_URG] = 1,
764 };
765
766 /* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */
767 static int tcp_error(struct net *net, struct nf_conn *tmpl,
768 struct sk_buff *skb,
769 unsigned int dataoff,
770 enum ip_conntrack_info *ctinfo,
771 u_int8_t pf,
772 unsigned int hooknum)
773 {
774 const struct tcphdr *th;
775 struct tcphdr _tcph;
776 unsigned int tcplen = skb->len - dataoff;
777 u_int8_t tcpflags;
778
779 /* Smaller that minimal TCP header? */
780 th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph);
781 if (th == NULL) {
782 if (LOG_INVALID(net, IPPROTO_TCP))
783 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
784 "nf_ct_tcp: short packet ");
785 return -NF_ACCEPT;
786 }
787
788 /* Not whole TCP header or malformed packet */
789 if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) {
790 if (LOG_INVALID(net, IPPROTO_TCP))
791 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
792 "nf_ct_tcp: truncated/malformed packet ");
793 return -NF_ACCEPT;
794 }
795
796 /* Checksum invalid? Ignore.
797 * We skip checking packets on the outgoing path
798 * because the checksum is assumed to be correct.
799 */
800 /* FIXME: Source route IP option packets --RR */
801 if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
802 nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) {
803 if (LOG_INVALID(net, IPPROTO_TCP))
804 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
805 "nf_ct_tcp: bad TCP checksum ");
806 return -NF_ACCEPT;
807 }
808
809 /* Check TCP flags. */
810 tcpflags = (tcp_flag_byte(th) & ~(TCPHDR_ECE|TCPHDR_CWR|TCPHDR_PSH));
811 if (!tcp_valid_flags[tcpflags]) {
812 if (LOG_INVALID(net, IPPROTO_TCP))
813 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
814 "nf_ct_tcp: invalid TCP flag combination ");
815 return -NF_ACCEPT;
816 }
817
818 return NF_ACCEPT;
819 }
820
821 static unsigned int *tcp_get_timeouts(struct net *net)
822 {
823 return tcp_pernet(net)->timeouts;
824 }
825
826 /* Returns verdict for packet, or -1 for invalid. */
827 static int tcp_packet(struct nf_conn *ct,
828 const struct sk_buff *skb,
829 unsigned int dataoff,
830 enum ip_conntrack_info ctinfo,
831 u_int8_t pf,
832 unsigned int hooknum,
833 unsigned int *timeouts)
834 {
835 struct net *net = nf_ct_net(ct);
836 struct nf_tcp_net *tn = tcp_pernet(net);
837 struct nf_conntrack_tuple *tuple;
838 enum tcp_conntrack new_state, old_state;
839 enum ip_conntrack_dir dir;
840 const struct tcphdr *th;
841 struct tcphdr _tcph;
842 unsigned long timeout;
843 unsigned int index;
844
845 th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph);
846 BUG_ON(th == NULL);
847
848 spin_lock_bh(&ct->lock);
849 old_state = ct->proto.tcp.state;
850 dir = CTINFO2DIR(ctinfo);
851 index = get_conntrack_index(th);
852 new_state = tcp_conntracks[dir][index][old_state];
853 tuple = &ct->tuplehash[dir].tuple;
854
855 switch (new_state) {
856 case TCP_CONNTRACK_SYN_SENT:
857 if (old_state < TCP_CONNTRACK_TIME_WAIT)
858 break;
859 /* RFC 1122: "When a connection is closed actively,
860 * it MUST linger in TIME-WAIT state for a time 2xMSL
861 * (Maximum Segment Lifetime). However, it MAY accept
862 * a new SYN from the remote TCP to reopen the connection
863 * directly from TIME-WAIT state, if..."
864 * We ignore the conditions because we are in the
865 * TIME-WAIT state anyway.
866 *
867 * Handle aborted connections: we and the server
868 * think there is an existing connection but the client
869 * aborts it and starts a new one.
870 */
871 if (((ct->proto.tcp.seen[dir].flags
872 | ct->proto.tcp.seen[!dir].flags)
873 & IP_CT_TCP_FLAG_CLOSE_INIT)
874 || (ct->proto.tcp.last_dir == dir
875 && ct->proto.tcp.last_index == TCP_RST_SET)) {
876 /* Attempt to reopen a closed/aborted connection.
877 * Delete this connection and look up again. */
878 spin_unlock_bh(&ct->lock);
879
880 /* Only repeat if we can actually remove the timer.
881 * Destruction may already be in progress in process
882 * context and we must give it a chance to terminate.
883 */
884 if (nf_ct_kill(ct))
885 return -NF_REPEAT;
886 return NF_DROP;
887 }
888 /* Fall through */
889 case TCP_CONNTRACK_IGNORE:
890 /* Ignored packets:
891 *
892 * Our connection entry may be out of sync, so ignore
893 * packets which may signal the real connection between
894 * the client and the server.
895 *
896 * a) SYN in ORIGINAL
897 * b) SYN/ACK in REPLY
898 * c) ACK in reply direction after initial SYN in original.
899 *
900 * If the ignored packet is invalid, the receiver will send
901 * a RST we'll catch below.
902 */
903 if (index == TCP_SYNACK_SET
904 && ct->proto.tcp.last_index == TCP_SYN_SET
905 && ct->proto.tcp.last_dir != dir
906 && ntohl(th->ack_seq) == ct->proto.tcp.last_end) {
907 /* b) This SYN/ACK acknowledges a SYN that we earlier
908 * ignored as invalid. This means that the client and
909 * the server are both in sync, while the firewall is
910 * not. We get in sync from the previously annotated
911 * values.
912 */
913 old_state = TCP_CONNTRACK_SYN_SENT;
914 new_state = TCP_CONNTRACK_SYN_RECV;
915 ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_end =
916 ct->proto.tcp.last_end;
917 ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_maxend =
918 ct->proto.tcp.last_end;
919 ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_maxwin =
920 ct->proto.tcp.last_win == 0 ?
921 1 : ct->proto.tcp.last_win;
922 ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_scale =
923 ct->proto.tcp.last_wscale;
924 ct->proto.tcp.seen[ct->proto.tcp.last_dir].flags =
925 ct->proto.tcp.last_flags;
926 memset(&ct->proto.tcp.seen[dir], 0,
927 sizeof(struct ip_ct_tcp_state));
928 break;
929 }
930 ct->proto.tcp.last_index = index;
931 ct->proto.tcp.last_dir = dir;
932 ct->proto.tcp.last_seq = ntohl(th->seq);
933 ct->proto.tcp.last_end =
934 segment_seq_plus_len(ntohl(th->seq), skb->len, dataoff, th);
935 ct->proto.tcp.last_win = ntohs(th->window);
936
937 /* a) This is a SYN in ORIGINAL. The client and the server
938 * may be in sync but we are not. In that case, we annotate
939 * the TCP options and let the packet go through. If it is a
940 * valid SYN packet, the server will reply with a SYN/ACK, and
941 * then we'll get in sync. Otherwise, the server ignores it. */
942 if (index == TCP_SYN_SET && dir == IP_CT_DIR_ORIGINAL) {
943 struct ip_ct_tcp_state seen = {};
944
945 ct->proto.tcp.last_flags =
946 ct->proto.tcp.last_wscale = 0;
947 tcp_options(skb, dataoff, th, &seen);
948 if (seen.flags & IP_CT_TCP_FLAG_WINDOW_SCALE) {
949 ct->proto.tcp.last_flags |=
950 IP_CT_TCP_FLAG_WINDOW_SCALE;
951 ct->proto.tcp.last_wscale = seen.td_scale;
952 }
953 if (seen.flags & IP_CT_TCP_FLAG_SACK_PERM) {
954 ct->proto.tcp.last_flags |=
955 IP_CT_TCP_FLAG_SACK_PERM;
956 }
957 }
958 spin_unlock_bh(&ct->lock);
959 if (LOG_INVALID(net, IPPROTO_TCP))
960 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
961 "nf_ct_tcp: invalid packet ignored in "
962 "state %s ", tcp_conntrack_names[old_state]);
963 return NF_ACCEPT;
964 case TCP_CONNTRACK_MAX:
965 /* Invalid packet */
966 pr_debug("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n",
967 dir, get_conntrack_index(th), old_state);
968 spin_unlock_bh(&ct->lock);
969 if (LOG_INVALID(net, IPPROTO_TCP))
970 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
971 "nf_ct_tcp: invalid state ");
972 return -NF_ACCEPT;
973 case TCP_CONNTRACK_CLOSE:
974 if (index == TCP_RST_SET
975 && (ct->proto.tcp.seen[!dir].flags & IP_CT_TCP_FLAG_MAXACK_SET)
976 && before(ntohl(th->seq), ct->proto.tcp.seen[!dir].td_maxack)) {
977 /* Invalid RST */
978 spin_unlock_bh(&ct->lock);
979 if (LOG_INVALID(net, IPPROTO_TCP))
980 nf_log_packet(net, pf, 0, skb, NULL, NULL,
981 NULL, "nf_ct_tcp: invalid RST ");
982 return -NF_ACCEPT;
983 }
984 if (index == TCP_RST_SET
985 && ((test_bit(IPS_SEEN_REPLY_BIT, &ct->status)
986 && ct->proto.tcp.last_index == TCP_SYN_SET)
987 || (!test_bit(IPS_ASSURED_BIT, &ct->status)
988 && ct->proto.tcp.last_index == TCP_ACK_SET))
989 && ntohl(th->ack_seq) == ct->proto.tcp.last_end) {
990 /* RST sent to invalid SYN or ACK we had let through
991 * at a) and c) above:
992 *
993 * a) SYN was in window then
994 * c) we hold a half-open connection.
995 *
996 * Delete our connection entry.
997 * We skip window checking, because packet might ACK
998 * segments we ignored. */
999 goto in_window;
1000 }
1001 /* Just fall through */
1002 default:
1003 /* Keep compilers happy. */
1004 break;
1005 }
1006
1007 if (!tcp_in_window(ct, &ct->proto.tcp, dir, index,
1008 skb, dataoff, th, pf)) {
1009 spin_unlock_bh(&ct->lock);
1010 return -NF_ACCEPT;
1011 }
1012 in_window:
1013 /* From now on we have got in-window packets */
1014 ct->proto.tcp.last_index = index;
1015 ct->proto.tcp.last_dir = dir;
1016
1017 pr_debug("tcp_conntracks: ");
1018 nf_ct_dump_tuple(tuple);
1019 pr_debug("syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n",
1020 (th->syn ? 1 : 0), (th->ack ? 1 : 0),
1021 (th->fin ? 1 : 0), (th->rst ? 1 : 0),
1022 old_state, new_state);
1023
1024 ct->proto.tcp.state = new_state;
1025 if (old_state != new_state
1026 && new_state == TCP_CONNTRACK_FIN_WAIT)
1027 ct->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT;
1028
1029 if (ct->proto.tcp.retrans >= tn->tcp_max_retrans &&
1030 timeouts[new_state] > timeouts[TCP_CONNTRACK_RETRANS])
1031 timeout = timeouts[TCP_CONNTRACK_RETRANS];
1032 else if ((ct->proto.tcp.seen[0].flags | ct->proto.tcp.seen[1].flags) &
1033 IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED &&
1034 timeouts[new_state] > timeouts[TCP_CONNTRACK_UNACK])
1035 timeout = timeouts[TCP_CONNTRACK_UNACK];
1036 else
1037 timeout = timeouts[new_state];
1038 spin_unlock_bh(&ct->lock);
1039
1040 if (new_state != old_state)
1041 nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
1042
1043 if (!test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
1044 /* If only reply is a RST, we can consider ourselves not to
1045 have an established connection: this is a fairly common
1046 problem case, so we can delete the conntrack
1047 immediately. --RR */
1048 if (th->rst) {
1049 nf_ct_kill_acct(ct, ctinfo, skb);
1050 return NF_ACCEPT;
1051 }
1052 } else if (!test_bit(IPS_ASSURED_BIT, &ct->status)
1053 && (old_state == TCP_CONNTRACK_SYN_RECV
1054 || old_state == TCP_CONNTRACK_ESTABLISHED)
1055 && new_state == TCP_CONNTRACK_ESTABLISHED) {
1056 /* Set ASSURED if we see see valid ack in ESTABLISHED
1057 after SYN_RECV or a valid answer for a picked up
1058 connection. */
1059 set_bit(IPS_ASSURED_BIT, &ct->status);
1060 nf_conntrack_event_cache(IPCT_ASSURED, ct);
1061 }
1062 nf_ct_refresh_acct(ct, ctinfo, skb, timeout);
1063
1064 return NF_ACCEPT;
1065 }
1066
1067 /* Called when a new connection for this protocol found. */
1068 static bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb,
1069 unsigned int dataoff, unsigned int *timeouts)
1070 {
1071 enum tcp_conntrack new_state;
1072 const struct tcphdr *th;
1073 struct tcphdr _tcph;
1074 struct net *net = nf_ct_net(ct);
1075 struct nf_tcp_net *tn = tcp_pernet(net);
1076 const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[0];
1077 const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[1];
1078
1079 th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph);
1080 BUG_ON(th == NULL);
1081
1082 /* Don't need lock here: this conntrack not in circulation yet */
1083 new_state = tcp_conntracks[0][get_conntrack_index(th)][TCP_CONNTRACK_NONE];
1084
1085 /* Invalid: delete conntrack */
1086 if (new_state >= TCP_CONNTRACK_MAX) {
1087 pr_debug("nf_ct_tcp: invalid new deleting.\n");
1088 return false;
1089 }
1090
1091 if (new_state == TCP_CONNTRACK_SYN_SENT) {
1092 memset(&ct->proto.tcp, 0, sizeof(ct->proto.tcp));
1093 /* SYN packet */
1094 ct->proto.tcp.seen[0].td_end =
1095 segment_seq_plus_len(ntohl(th->seq), skb->len,
1096 dataoff, th);
1097 ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window);
1098 if (ct->proto.tcp.seen[0].td_maxwin == 0)
1099 ct->proto.tcp.seen[0].td_maxwin = 1;
1100 ct->proto.tcp.seen[0].td_maxend =
1101 ct->proto.tcp.seen[0].td_end;
1102
1103 tcp_options(skb, dataoff, th, &ct->proto.tcp.seen[0]);
1104 } else if (tn->tcp_loose == 0) {
1105 /* Don't try to pick up connections. */
1106 return false;
1107 } else {
1108 memset(&ct->proto.tcp, 0, sizeof(ct->proto.tcp));
1109 /*
1110 * We are in the middle of a connection,
1111 * its history is lost for us.
1112 * Let's try to use the data from the packet.
1113 */
1114 ct->proto.tcp.seen[0].td_end =
1115 segment_seq_plus_len(ntohl(th->seq), skb->len,
1116 dataoff, th);
1117 ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window);
1118 if (ct->proto.tcp.seen[0].td_maxwin == 0)
1119 ct->proto.tcp.seen[0].td_maxwin = 1;
1120 ct->proto.tcp.seen[0].td_maxend =
1121 ct->proto.tcp.seen[0].td_end +
1122 ct->proto.tcp.seen[0].td_maxwin;
1123
1124 /* We assume SACK and liberal window checking to handle
1125 * window scaling */
1126 ct->proto.tcp.seen[0].flags =
1127 ct->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM |
1128 IP_CT_TCP_FLAG_BE_LIBERAL;
1129 }
1130
1131 /* tcp_packet will set them */
1132 ct->proto.tcp.last_index = TCP_NONE_SET;
1133
1134 pr_debug("tcp_new: sender end=%u maxend=%u maxwin=%u scale=%i "
1135 "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
1136 sender->td_end, sender->td_maxend, sender->td_maxwin,
1137 sender->td_scale,
1138 receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
1139 receiver->td_scale);
1140 return true;
1141 }
1142
1143 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
1144
1145 #include <linux/netfilter/nfnetlink.h>
1146 #include <linux/netfilter/nfnetlink_conntrack.h>
1147
1148 static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
1149 struct nf_conn *ct)
1150 {
1151 struct nlattr *nest_parms;
1152 struct nf_ct_tcp_flags tmp = {};
1153
1154 spin_lock_bh(&ct->lock);
1155 nest_parms = nla_nest_start(skb, CTA_PROTOINFO_TCP | NLA_F_NESTED);
1156 if (!nest_parms)
1157 goto nla_put_failure;
1158
1159 if (nla_put_u8(skb, CTA_PROTOINFO_TCP_STATE, ct->proto.tcp.state) ||
1160 nla_put_u8(skb, CTA_PROTOINFO_TCP_WSCALE_ORIGINAL,
1161 ct->proto.tcp.seen[0].td_scale) ||
1162 nla_put_u8(skb, CTA_PROTOINFO_TCP_WSCALE_REPLY,
1163 ct->proto.tcp.seen[1].td_scale))
1164 goto nla_put_failure;
1165
1166 tmp.flags = ct->proto.tcp.seen[0].flags;
1167 if (nla_put(skb, CTA_PROTOINFO_TCP_FLAGS_ORIGINAL,
1168 sizeof(struct nf_ct_tcp_flags), &tmp))
1169 goto nla_put_failure;
1170
1171 tmp.flags = ct->proto.tcp.seen[1].flags;
1172 if (nla_put(skb, CTA_PROTOINFO_TCP_FLAGS_REPLY,
1173 sizeof(struct nf_ct_tcp_flags), &tmp))
1174 goto nla_put_failure;
1175 spin_unlock_bh(&ct->lock);
1176
1177 nla_nest_end(skb, nest_parms);
1178
1179 return 0;
1180
1181 nla_put_failure:
1182 spin_unlock_bh(&ct->lock);
1183 return -1;
1184 }
1185
1186 static const struct nla_policy tcp_nla_policy[CTA_PROTOINFO_TCP_MAX+1] = {
1187 [CTA_PROTOINFO_TCP_STATE] = { .type = NLA_U8 },
1188 [CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] = { .type = NLA_U8 },
1189 [CTA_PROTOINFO_TCP_WSCALE_REPLY] = { .type = NLA_U8 },
1190 [CTA_PROTOINFO_TCP_FLAGS_ORIGINAL] = { .len = sizeof(struct nf_ct_tcp_flags) },
1191 [CTA_PROTOINFO_TCP_FLAGS_REPLY] = { .len = sizeof(struct nf_ct_tcp_flags) },
1192 };
1193
1194 static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct)
1195 {
1196 struct nlattr *pattr = cda[CTA_PROTOINFO_TCP];
1197 struct nlattr *tb[CTA_PROTOINFO_TCP_MAX+1];
1198 int err;
1199
1200 /* updates could not contain anything about the private
1201 * protocol info, in that case skip the parsing */
1202 if (!pattr)
1203 return 0;
1204
1205 err = nla_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, pattr, tcp_nla_policy);
1206 if (err < 0)
1207 return err;
1208
1209 if (tb[CTA_PROTOINFO_TCP_STATE] &&
1210 nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]) >= TCP_CONNTRACK_MAX)
1211 return -EINVAL;
1212
1213 spin_lock_bh(&ct->lock);
1214 if (tb[CTA_PROTOINFO_TCP_STATE])
1215 ct->proto.tcp.state = nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]);
1216
1217 if (tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]) {
1218 struct nf_ct_tcp_flags *attr =
1219 nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]);
1220 ct->proto.tcp.seen[0].flags &= ~attr->mask;
1221 ct->proto.tcp.seen[0].flags |= attr->flags & attr->mask;
1222 }
1223
1224 if (tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]) {
1225 struct nf_ct_tcp_flags *attr =
1226 nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]);
1227 ct->proto.tcp.seen[1].flags &= ~attr->mask;
1228 ct->proto.tcp.seen[1].flags |= attr->flags & attr->mask;
1229 }
1230
1231 if (tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] &&
1232 tb[CTA_PROTOINFO_TCP_WSCALE_REPLY] &&
1233 ct->proto.tcp.seen[0].flags & IP_CT_TCP_FLAG_WINDOW_SCALE &&
1234 ct->proto.tcp.seen[1].flags & IP_CT_TCP_FLAG_WINDOW_SCALE) {
1235 ct->proto.tcp.seen[0].td_scale =
1236 nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL]);
1237 ct->proto.tcp.seen[1].td_scale =
1238 nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_REPLY]);
1239 }
1240 spin_unlock_bh(&ct->lock);
1241
1242 return 0;
1243 }
1244
1245 static int tcp_nlattr_size(void)
1246 {
1247 return nla_total_size(0) /* CTA_PROTOINFO_TCP */
1248 + nla_policy_len(tcp_nla_policy, CTA_PROTOINFO_TCP_MAX + 1);
1249 }
1250
1251 static int tcp_nlattr_tuple_size(void)
1252 {
1253 return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1);
1254 }
1255 #endif
1256
1257 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
1258
1259 #include <linux/netfilter/nfnetlink.h>
1260 #include <linux/netfilter/nfnetlink_cttimeout.h>
1261
1262 static int tcp_timeout_nlattr_to_obj(struct nlattr *tb[],
1263 struct net *net, void *data)
1264 {
1265 unsigned int *timeouts = data;
1266 struct nf_tcp_net *tn = tcp_pernet(net);
1267 int i;
1268
1269 /* set default TCP timeouts. */
1270 for (i=0; i<TCP_CONNTRACK_TIMEOUT_MAX; i++)
1271 timeouts[i] = tn->timeouts[i];
1272
1273 if (tb[CTA_TIMEOUT_TCP_SYN_SENT]) {
1274 timeouts[TCP_CONNTRACK_SYN_SENT] =
1275 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_SENT]))*HZ;
1276 }
1277 if (tb[CTA_TIMEOUT_TCP_SYN_RECV]) {
1278 timeouts[TCP_CONNTRACK_SYN_RECV] =
1279 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_RECV]))*HZ;
1280 }
1281 if (tb[CTA_TIMEOUT_TCP_ESTABLISHED]) {
1282 timeouts[TCP_CONNTRACK_ESTABLISHED] =
1283 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_ESTABLISHED]))*HZ;
1284 }
1285 if (tb[CTA_TIMEOUT_TCP_FIN_WAIT]) {
1286 timeouts[TCP_CONNTRACK_FIN_WAIT] =
1287 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_FIN_WAIT]))*HZ;
1288 }
1289 if (tb[CTA_TIMEOUT_TCP_CLOSE_WAIT]) {
1290 timeouts[TCP_CONNTRACK_CLOSE_WAIT] =
1291 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_CLOSE_WAIT]))*HZ;
1292 }
1293 if (tb[CTA_TIMEOUT_TCP_LAST_ACK]) {
1294 timeouts[TCP_CONNTRACK_LAST_ACK] =
1295 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_LAST_ACK]))*HZ;
1296 }
1297 if (tb[CTA_TIMEOUT_TCP_TIME_WAIT]) {
1298 timeouts[TCP_CONNTRACK_TIME_WAIT] =
1299 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_TIME_WAIT]))*HZ;
1300 }
1301 if (tb[CTA_TIMEOUT_TCP_CLOSE]) {
1302 timeouts[TCP_CONNTRACK_CLOSE] =
1303 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_CLOSE]))*HZ;
1304 }
1305 if (tb[CTA_TIMEOUT_TCP_SYN_SENT2]) {
1306 timeouts[TCP_CONNTRACK_SYN_SENT2] =
1307 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_SENT2]))*HZ;
1308 }
1309 if (tb[CTA_TIMEOUT_TCP_RETRANS]) {
1310 timeouts[TCP_CONNTRACK_RETRANS] =
1311 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_RETRANS]))*HZ;
1312 }
1313 if (tb[CTA_TIMEOUT_TCP_UNACK]) {
1314 timeouts[TCP_CONNTRACK_UNACK] =
1315 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_UNACK]))*HZ;
1316 }
1317 return 0;
1318 }
1319
1320 static int
1321 tcp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
1322 {
1323 const unsigned int *timeouts = data;
1324
1325 if (nla_put_be32(skb, CTA_TIMEOUT_TCP_SYN_SENT,
1326 htonl(timeouts[TCP_CONNTRACK_SYN_SENT] / HZ)) ||
1327 nla_put_be32(skb, CTA_TIMEOUT_TCP_SYN_RECV,
1328 htonl(timeouts[TCP_CONNTRACK_SYN_RECV] / HZ)) ||
1329 nla_put_be32(skb, CTA_TIMEOUT_TCP_ESTABLISHED,
1330 htonl(timeouts[TCP_CONNTRACK_ESTABLISHED] / HZ)) ||
1331 nla_put_be32(skb, CTA_TIMEOUT_TCP_FIN_WAIT,
1332 htonl(timeouts[TCP_CONNTRACK_FIN_WAIT] / HZ)) ||
1333 nla_put_be32(skb, CTA_TIMEOUT_TCP_CLOSE_WAIT,
1334 htonl(timeouts[TCP_CONNTRACK_CLOSE_WAIT] / HZ)) ||
1335 nla_put_be32(skb, CTA_TIMEOUT_TCP_LAST_ACK,
1336 htonl(timeouts[TCP_CONNTRACK_LAST_ACK] / HZ)) ||
1337 nla_put_be32(skb, CTA_TIMEOUT_TCP_TIME_WAIT,
1338 htonl(timeouts[TCP_CONNTRACK_TIME_WAIT] / HZ)) ||
1339 nla_put_be32(skb, CTA_TIMEOUT_TCP_CLOSE,
1340 htonl(timeouts[TCP_CONNTRACK_CLOSE] / HZ)) ||
1341 nla_put_be32(skb, CTA_TIMEOUT_TCP_SYN_SENT2,
1342 htonl(timeouts[TCP_CONNTRACK_SYN_SENT2] / HZ)) ||
1343 nla_put_be32(skb, CTA_TIMEOUT_TCP_RETRANS,
1344 htonl(timeouts[TCP_CONNTRACK_RETRANS] / HZ)) ||
1345 nla_put_be32(skb, CTA_TIMEOUT_TCP_UNACK,
1346 htonl(timeouts[TCP_CONNTRACK_UNACK] / HZ)))
1347 goto nla_put_failure;
1348 return 0;
1349
1350 nla_put_failure:
1351 return -ENOSPC;
1352 }
1353
1354 static const struct nla_policy tcp_timeout_nla_policy[CTA_TIMEOUT_TCP_MAX+1] = {
1355 [CTA_TIMEOUT_TCP_SYN_SENT] = { .type = NLA_U32 },
1356 [CTA_TIMEOUT_TCP_SYN_RECV] = { .type = NLA_U32 },
1357 [CTA_TIMEOUT_TCP_ESTABLISHED] = { .type = NLA_U32 },
1358 [CTA_TIMEOUT_TCP_FIN_WAIT] = { .type = NLA_U32 },
1359 [CTA_TIMEOUT_TCP_CLOSE_WAIT] = { .type = NLA_U32 },
1360 [CTA_TIMEOUT_TCP_LAST_ACK] = { .type = NLA_U32 },
1361 [CTA_TIMEOUT_TCP_TIME_WAIT] = { .type = NLA_U32 },
1362 [CTA_TIMEOUT_TCP_CLOSE] = { .type = NLA_U32 },
1363 [CTA_TIMEOUT_TCP_SYN_SENT2] = { .type = NLA_U32 },
1364 [CTA_TIMEOUT_TCP_RETRANS] = { .type = NLA_U32 },
1365 [CTA_TIMEOUT_TCP_UNACK] = { .type = NLA_U32 },
1366 };
1367 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
1368
1369 #ifdef CONFIG_SYSCTL
1370 static struct ctl_table tcp_sysctl_table[] = {
1371 {
1372 .procname = "nf_conntrack_tcp_timeout_syn_sent",
1373 .maxlen = sizeof(unsigned int),
1374 .mode = 0644,
1375 .proc_handler = proc_dointvec_jiffies,
1376 },
1377 {
1378 .procname = "nf_conntrack_tcp_timeout_syn_recv",
1379 .maxlen = sizeof(unsigned int),
1380 .mode = 0644,
1381 .proc_handler = proc_dointvec_jiffies,
1382 },
1383 {
1384 .procname = "nf_conntrack_tcp_timeout_established",
1385 .maxlen = sizeof(unsigned int),
1386 .mode = 0644,
1387 .proc_handler = proc_dointvec_jiffies,
1388 },
1389 {
1390 .procname = "nf_conntrack_tcp_timeout_fin_wait",
1391 .maxlen = sizeof(unsigned int),
1392 .mode = 0644,
1393 .proc_handler = proc_dointvec_jiffies,
1394 },
1395 {
1396 .procname = "nf_conntrack_tcp_timeout_close_wait",
1397 .maxlen = sizeof(unsigned int),
1398 .mode = 0644,
1399 .proc_handler = proc_dointvec_jiffies,
1400 },
1401 {
1402 .procname = "nf_conntrack_tcp_timeout_last_ack",
1403 .maxlen = sizeof(unsigned int),
1404 .mode = 0644,
1405 .proc_handler = proc_dointvec_jiffies,
1406 },
1407 {
1408 .procname = "nf_conntrack_tcp_timeout_time_wait",
1409 .maxlen = sizeof(unsigned int),
1410 .mode = 0644,
1411 .proc_handler = proc_dointvec_jiffies,
1412 },
1413 {
1414 .procname = "nf_conntrack_tcp_timeout_close",
1415 .maxlen = sizeof(unsigned int),
1416 .mode = 0644,
1417 .proc_handler = proc_dointvec_jiffies,
1418 },
1419 {
1420 .procname = "nf_conntrack_tcp_timeout_max_retrans",
1421 .maxlen = sizeof(unsigned int),
1422 .mode = 0644,
1423 .proc_handler = proc_dointvec_jiffies,
1424 },
1425 {
1426 .procname = "nf_conntrack_tcp_timeout_unacknowledged",
1427 .maxlen = sizeof(unsigned int),
1428 .mode = 0644,
1429 .proc_handler = proc_dointvec_jiffies,
1430 },
1431 {
1432 .procname = "nf_conntrack_tcp_loose",
1433 .maxlen = sizeof(unsigned int),
1434 .mode = 0644,
1435 .proc_handler = proc_dointvec,
1436 },
1437 {
1438 .procname = "nf_conntrack_tcp_be_liberal",
1439 .maxlen = sizeof(unsigned int),
1440 .mode = 0644,
1441 .proc_handler = proc_dointvec,
1442 },
1443 {
1444 .procname = "nf_conntrack_tcp_max_retrans",
1445 .maxlen = sizeof(unsigned int),
1446 .mode = 0644,
1447 .proc_handler = proc_dointvec,
1448 },
1449 {
1450 .procname = "nf_conntrack_tcp_no_window_check",
1451 .maxlen = sizeof(unsigned int),
1452 .mode = 0644,
1453 .proc_handler = proc_dointvec,
1454 },
1455 { }
1456 };
1457
1458 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
1459 static struct ctl_table tcp_compat_sysctl_table[] = {
1460 {
1461 .procname = "ip_conntrack_tcp_timeout_syn_sent",
1462 .maxlen = sizeof(unsigned int),
1463 .mode = 0644,
1464 .proc_handler = proc_dointvec_jiffies,
1465 },
1466 {
1467 .procname = "ip_conntrack_tcp_timeout_syn_sent2",
1468 .maxlen = sizeof(unsigned int),
1469 .mode = 0644,
1470 .proc_handler = proc_dointvec_jiffies,
1471 },
1472 {
1473 .procname = "ip_conntrack_tcp_timeout_syn_recv",
1474 .maxlen = sizeof(unsigned int),
1475 .mode = 0644,
1476 .proc_handler = proc_dointvec_jiffies,
1477 },
1478 {
1479 .procname = "ip_conntrack_tcp_timeout_established",
1480 .maxlen = sizeof(unsigned int),
1481 .mode = 0644,
1482 .proc_handler = proc_dointvec_jiffies,
1483 },
1484 {
1485 .procname = "ip_conntrack_tcp_timeout_fin_wait",
1486 .maxlen = sizeof(unsigned int),
1487 .mode = 0644,
1488 .proc_handler = proc_dointvec_jiffies,
1489 },
1490 {
1491 .procname = "ip_conntrack_tcp_timeout_close_wait",
1492 .maxlen = sizeof(unsigned int),
1493 .mode = 0644,
1494 .proc_handler = proc_dointvec_jiffies,
1495 },
1496 {
1497 .procname = "ip_conntrack_tcp_timeout_last_ack",
1498 .maxlen = sizeof(unsigned int),
1499 .mode = 0644,
1500 .proc_handler = proc_dointvec_jiffies,
1501 },
1502 {
1503 .procname = "ip_conntrack_tcp_timeout_time_wait",
1504 .maxlen = sizeof(unsigned int),
1505 .mode = 0644,
1506 .proc_handler = proc_dointvec_jiffies,
1507 },
1508 {
1509 .procname = "ip_conntrack_tcp_timeout_close",
1510 .maxlen = sizeof(unsigned int),
1511 .mode = 0644,
1512 .proc_handler = proc_dointvec_jiffies,
1513 },
1514 {
1515 .procname = "ip_conntrack_tcp_timeout_max_retrans",
1516 .maxlen = sizeof(unsigned int),
1517 .mode = 0644,
1518 .proc_handler = proc_dointvec_jiffies,
1519 },
1520 {
1521 .procname = "ip_conntrack_tcp_loose",
1522 .maxlen = sizeof(unsigned int),
1523 .mode = 0644,
1524 .proc_handler = proc_dointvec,
1525 },
1526 {
1527 .procname = "ip_conntrack_tcp_be_liberal",
1528 .maxlen = sizeof(unsigned int),
1529 .mode = 0644,
1530 .proc_handler = proc_dointvec,
1531 },
1532 {
1533 .procname = "ip_conntrack_tcp_max_retrans",
1534 .maxlen = sizeof(unsigned int),
1535 .mode = 0644,
1536 .proc_handler = proc_dointvec,
1537 },
1538 {
1539 .procname = "ip_conntrack_tcp_no_window_check",
1540 .maxlen = sizeof(unsigned int),
1541 .mode = 0644,
1542 .proc_handler = proc_dointvec,
1543 },
1544 { }
1545 };
1546 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
1547 #endif /* CONFIG_SYSCTL */
1548
1549 static int tcp_kmemdup_sysctl_table(struct nf_proto_net *pn,
1550 struct nf_tcp_net *tn)
1551 {
1552 #ifdef CONFIG_SYSCTL
1553 if (pn->ctl_table)
1554 return 0;
1555
1556 pn->ctl_table = kmemdup(tcp_sysctl_table,
1557 sizeof(tcp_sysctl_table),
1558 GFP_KERNEL);
1559 if (!pn->ctl_table)
1560 return -ENOMEM;
1561
1562 pn->ctl_table[0].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT];
1563 pn->ctl_table[1].data = &tn->timeouts[TCP_CONNTRACK_SYN_RECV];
1564 pn->ctl_table[2].data = &tn->timeouts[TCP_CONNTRACK_ESTABLISHED];
1565 pn->ctl_table[3].data = &tn->timeouts[TCP_CONNTRACK_FIN_WAIT];
1566 pn->ctl_table[4].data = &tn->timeouts[TCP_CONNTRACK_CLOSE_WAIT];
1567 pn->ctl_table[5].data = &tn->timeouts[TCP_CONNTRACK_LAST_ACK];
1568 pn->ctl_table[6].data = &tn->timeouts[TCP_CONNTRACK_TIME_WAIT];
1569 pn->ctl_table[7].data = &tn->timeouts[TCP_CONNTRACK_CLOSE];
1570 pn->ctl_table[8].data = &tn->timeouts[TCP_CONNTRACK_RETRANS];
1571 pn->ctl_table[9].data = &tn->timeouts[TCP_CONNTRACK_UNACK];
1572 pn->ctl_table[10].data = &tn->tcp_loose;
1573 pn->ctl_table[11].data = &tn->tcp_be_liberal;
1574 pn->ctl_table[12].data = &tn->tcp_max_retrans;
1575 pn->ctl_table[13].data = &nf_ct_tcp_no_window_check;
1576 #endif
1577 return 0;
1578 }
1579
1580 static int tcp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn,
1581 struct nf_tcp_net *tn)
1582 {
1583 #ifdef CONFIG_SYSCTL
1584 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
1585 pn->ctl_compat_table = kmemdup(tcp_compat_sysctl_table,
1586 sizeof(tcp_compat_sysctl_table),
1587 GFP_KERNEL);
1588 if (!pn->ctl_compat_table)
1589 return -ENOMEM;
1590
1591 pn->ctl_compat_table[0].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT];
1592 pn->ctl_compat_table[1].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT2];
1593 pn->ctl_compat_table[2].data = &tn->timeouts[TCP_CONNTRACK_SYN_RECV];
1594 pn->ctl_compat_table[3].data = &tn->timeouts[TCP_CONNTRACK_ESTABLISHED];
1595 pn->ctl_compat_table[4].data = &tn->timeouts[TCP_CONNTRACK_FIN_WAIT];
1596 pn->ctl_compat_table[5].data = &tn->timeouts[TCP_CONNTRACK_CLOSE_WAIT];
1597 pn->ctl_compat_table[6].data = &tn->timeouts[TCP_CONNTRACK_LAST_ACK];
1598 pn->ctl_compat_table[7].data = &tn->timeouts[TCP_CONNTRACK_TIME_WAIT];
1599 pn->ctl_compat_table[8].data = &tn->timeouts[TCP_CONNTRACK_CLOSE];
1600 pn->ctl_compat_table[9].data = &tn->timeouts[TCP_CONNTRACK_RETRANS];
1601 pn->ctl_compat_table[10].data = &tn->tcp_loose;
1602 pn->ctl_compat_table[11].data = &tn->tcp_be_liberal;
1603 pn->ctl_compat_table[12].data = &tn->tcp_max_retrans;
1604 pn->ctl_compat_table[13].data = &nf_ct_tcp_no_window_check;
1605 #endif
1606 #endif
1607 return 0;
1608 }
1609
1610 static int tcp_init_net(struct net *net, u_int16_t proto)
1611 {
1612 int ret;
1613 struct nf_tcp_net *tn = tcp_pernet(net);
1614 struct nf_proto_net *pn = &tn->pn;
1615
1616 if (!pn->users) {
1617 int i;
1618
1619 for (i = 0; i < TCP_CONNTRACK_TIMEOUT_MAX; i++)
1620 tn->timeouts[i] = tcp_timeouts[i];
1621
1622 tn->tcp_loose = nf_ct_tcp_loose;
1623 tn->tcp_be_liberal = nf_ct_tcp_be_liberal;
1624 tn->tcp_max_retrans = nf_ct_tcp_max_retrans;
1625 }
1626
1627 if (proto == AF_INET) {
1628 ret = tcp_kmemdup_compat_sysctl_table(pn, tn);
1629 if (ret < 0)
1630 return ret;
1631
1632 ret = tcp_kmemdup_sysctl_table(pn, tn);
1633 if (ret < 0)
1634 nf_ct_kfree_compat_sysctl_table(pn);
1635 } else
1636 ret = tcp_kmemdup_sysctl_table(pn, tn);
1637
1638 return ret;
1639 }
1640
1641 static struct nf_proto_net *tcp_get_net_proto(struct net *net)
1642 {
1643 return &net->ct.nf_ct_proto.tcp.pn;
1644 }
1645
1646 struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly =
1647 {
1648 .l3proto = PF_INET,
1649 .l4proto = IPPROTO_TCP,
1650 .name = "tcp",
1651 .pkt_to_tuple = tcp_pkt_to_tuple,
1652 .invert_tuple = tcp_invert_tuple,
1653 .print_tuple = tcp_print_tuple,
1654 .print_conntrack = tcp_print_conntrack,
1655 .packet = tcp_packet,
1656 .get_timeouts = tcp_get_timeouts,
1657 .new = tcp_new,
1658 .error = tcp_error,
1659 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
1660 .to_nlattr = tcp_to_nlattr,
1661 .nlattr_size = tcp_nlattr_size,
1662 .from_nlattr = nlattr_to_tcp,
1663 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
1664 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
1665 .nlattr_tuple_size = tcp_nlattr_tuple_size,
1666 .nla_policy = nf_ct_port_nla_policy,
1667 #endif
1668 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
1669 .ctnl_timeout = {
1670 .nlattr_to_obj = tcp_timeout_nlattr_to_obj,
1671 .obj_to_nlattr = tcp_timeout_obj_to_nlattr,
1672 .nlattr_max = CTA_TIMEOUT_TCP_MAX,
1673 .obj_size = sizeof(unsigned int) *
1674 TCP_CONNTRACK_TIMEOUT_MAX,
1675 .nla_policy = tcp_timeout_nla_policy,
1676 },
1677 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
1678 .init_net = tcp_init_net,
1679 .get_net_proto = tcp_get_net_proto,
1680 };
1681 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4);
1682
1683 struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly =
1684 {
1685 .l3proto = PF_INET6,
1686 .l4proto = IPPROTO_TCP,
1687 .name = "tcp",
1688 .pkt_to_tuple = tcp_pkt_to_tuple,
1689 .invert_tuple = tcp_invert_tuple,
1690 .print_tuple = tcp_print_tuple,
1691 .print_conntrack = tcp_print_conntrack,
1692 .packet = tcp_packet,
1693 .get_timeouts = tcp_get_timeouts,
1694 .new = tcp_new,
1695 .error = tcp_error,
1696 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
1697 .to_nlattr = tcp_to_nlattr,
1698 .nlattr_size = tcp_nlattr_size,
1699 .from_nlattr = nlattr_to_tcp,
1700 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
1701 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
1702 .nlattr_tuple_size = tcp_nlattr_tuple_size,
1703 .nla_policy = nf_ct_port_nla_policy,
1704 #endif
1705 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
1706 .ctnl_timeout = {
1707 .nlattr_to_obj = tcp_timeout_nlattr_to_obj,
1708 .obj_to_nlattr = tcp_timeout_obj_to_nlattr,
1709 .nlattr_max = CTA_TIMEOUT_TCP_MAX,
1710 .obj_size = sizeof(unsigned int) *
1711 TCP_CONNTRACK_TIMEOUT_MAX,
1712 .nla_policy = tcp_timeout_nla_policy,
1713 },
1714 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
1715 .init_net = tcp_init_net,
1716 .get_net_proto = tcp_get_net_proto,
1717 };
1718 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6);
kernel source for telekom puls (alcatel/mediatek)