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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
35
36
37static int nf_ct_tcp_be_liberal __read_mostly = 0;
38
39
40
41static int nf_ct_tcp_loose __read_mostly = 1;
42
43
44
45
46static int nf_ct_tcp_max_retrans __read_mostly = 3;
47
48
49
50
51static const char *const tcp_conntrack_names[] = {
52 "NONE",
53 "SYN_SENT",
54 "SYN_RECV",
55 "ESTABLISHED",
56 "FIN_WAIT",
57 "CLOSE_WAIT",
58 "LAST_ACK",
59 "TIME_WAIT",
60 "CLOSE",
61 "SYN_SENT2",
62};
63
64#define SECS * HZ
65#define MINS * 60 SECS
66#define HOURS * 60 MINS
67#define DAYS * 24 HOURS
68
69static unsigned int tcp_timeouts[TCP_CONNTRACK_TIMEOUT_MAX] __read_mostly = {
70 [TCP_CONNTRACK_SYN_SENT] = 2 MINS,
71 [TCP_CONNTRACK_SYN_RECV] = 60 SECS,
72 [TCP_CONNTRACK_ESTABLISHED] = 5 DAYS,
73 [TCP_CONNTRACK_FIN_WAIT] = 2 MINS,
74 [TCP_CONNTRACK_CLOSE_WAIT] = 60 SECS,
75 [TCP_CONNTRACK_LAST_ACK] = 30 SECS,
76 [TCP_CONNTRACK_TIME_WAIT] = 2 MINS,
77 [TCP_CONNTRACK_CLOSE] = 10 SECS,
78 [TCP_CONNTRACK_SYN_SENT2] = 2 MINS,
79
80
81
82 [TCP_CONNTRACK_RETRANS] = 5 MINS,
83 [TCP_CONNTRACK_UNACK] = 5 MINS,
84};
85
86#define sNO TCP_CONNTRACK_NONE
87#define sSS TCP_CONNTRACK_SYN_SENT
88#define sSR TCP_CONNTRACK_SYN_RECV
89#define sES TCP_CONNTRACK_ESTABLISHED
90#define sFW TCP_CONNTRACK_FIN_WAIT
91#define sCW TCP_CONNTRACK_CLOSE_WAIT
92#define sLA TCP_CONNTRACK_LAST_ACK
93#define sTW TCP_CONNTRACK_TIME_WAIT
94#define sCL TCP_CONNTRACK_CLOSE
95#define sS2 TCP_CONNTRACK_SYN_SENT2
96#define sIV TCP_CONNTRACK_MAX
97#define sIG TCP_CONNTRACK_IGNORE
98
99
100enum tcp_bit_set {
101 TCP_SYN_SET,
102 TCP_SYNACK_SET,
103 TCP_FIN_SET,
104 TCP_ACK_SET,
105 TCP_RST_SET,
106 TCP_NONE_SET,
107};
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142static const u8 tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = {
143 {
144
145
146 { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sS2 },
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163 { sIV, sIV, sSR, sIV, sIV, sIV, sIV, sIV, sIV, sSR },
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177 { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV },
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194 { sES, sIV, sES, sES, sCW, sCW, sTW, sTW, sCL, sIV },
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208 { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL },
209 { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }
210 },
211 {
212
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214 { sIV, sS2, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sS2 },
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228 { sIV, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sIG, sSR },
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241 { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV },
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254 { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIG },
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267 { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL },
268 { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }
269 }
270};
271
272static inline struct nf_tcp_net *tcp_pernet(struct net *net)
273{
274 return &net->ct.nf_ct_proto.tcp;
275}
276
277static bool tcp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
278 struct nf_conntrack_tuple *tuple)
279{
280 const struct tcphdr *hp;
281 struct tcphdr _hdr;
282
283
284 hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
285 if (hp == NULL)
286 return false;
287
288 tuple->src.u.tcp.port = hp->source;
289 tuple->dst.u.tcp.port = hp->dest;
290
291 return true;
292}
293
294static bool tcp_invert_tuple(struct nf_conntrack_tuple *tuple,
295 const struct nf_conntrack_tuple *orig)
296{
297 tuple->src.u.tcp.port = orig->dst.u.tcp.port;
298 tuple->dst.u.tcp.port = orig->src.u.tcp.port;
299 return true;
300}
301
302
303static int tcp_print_tuple(struct seq_file *s,
304 const struct nf_conntrack_tuple *tuple)
305{
306 return seq_printf(s, "sport=%hu dport=%hu ",
307 ntohs(tuple->src.u.tcp.port),
308 ntohs(tuple->dst.u.tcp.port));
309}
310
311
312static int tcp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
313{
314 enum tcp_conntrack state;
315
316 spin_lock_bh(&ct->lock);
317 state = ct->proto.tcp.state;
318 spin_unlock_bh(&ct->lock);
319
320 return seq_printf(s, "%s ", tcp_conntrack_names[state]);
321}
322
323static unsigned int get_conntrack_index(const struct tcphdr *tcph)
324{
325 if (tcph->rst) return TCP_RST_SET;
326 else if (tcph->syn) return (tcph->ack ? TCP_SYNACK_SET : TCP_SYN_SET);
327 else if (tcph->fin) return TCP_FIN_SET;
328 else if (tcph->ack) return TCP_ACK_SET;
329 else return TCP_NONE_SET;
330}
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361static inline __u32 segment_seq_plus_len(__u32 seq,
362 size_t len,
363 unsigned int dataoff,
364 const struct tcphdr *tcph)
365{
366
367
368 return (seq + len - dataoff - tcph->doff*4
369 + (tcph->syn ? 1 : 0) + (tcph->fin ? 1 : 0));
370}
371
372
373#define MAXACKWINCONST 66000
374#define MAXACKWINDOW(sender) \
375 ((sender)->td_maxwin > MAXACKWINCONST ? (sender)->td_maxwin \
376 : MAXACKWINCONST)
377
378
379
380
381static void tcp_options(const struct sk_buff *skb,
382 unsigned int dataoff,
383 const struct tcphdr *tcph,
384 struct ip_ct_tcp_state *state)
385{
386 unsigned char buff[(15 * 4) - sizeof(struct tcphdr)];
387 const unsigned char *ptr;
388 int length = (tcph->doff*4) - sizeof(struct tcphdr);
389
390 if (!length)
391 return;
392
393 ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr),
394 length, buff);
395 BUG_ON(ptr == NULL);
396
397 state->td_scale =
398 state->flags = 0;
399
400 while (length > 0) {
401 int opcode=*ptr++;
402 int opsize;
403
404 switch (opcode) {
405 case TCPOPT_EOL:
406 return;
407 case TCPOPT_NOP:
408 length--;
409 continue;
410 default:
411 opsize=*ptr++;
412 if (opsize < 2)
413 return;
414 if (opsize > length)
415 return;
416
417 if (opcode == TCPOPT_SACK_PERM
418 && opsize == TCPOLEN_SACK_PERM)
419 state->flags |= IP_CT_TCP_FLAG_SACK_PERM;
420 else if (opcode == TCPOPT_WINDOW
421 && opsize == TCPOLEN_WINDOW) {
422 state->td_scale = *(u_int8_t *)ptr;
423
424 if (state->td_scale > 14) {
425
426 state->td_scale = 14;
427 }
428 state->flags |=
429 IP_CT_TCP_FLAG_WINDOW_SCALE;
430 }
431 ptr += opsize - 2;
432 length -= opsize;
433 }
434 }
435}
436
437static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff,
438 const struct tcphdr *tcph, __u32 *sack)
439{
440 unsigned char buff[(15 * 4) - sizeof(struct tcphdr)];
441 const unsigned char *ptr;
442 int length = (tcph->doff*4) - sizeof(struct tcphdr);
443 __u32 tmp;
444
445 if (!length)
446 return;
447
448 ptr = skb_header_pointer(skb, dataoff + sizeof(struct tcphdr),
449 length, buff);
450 BUG_ON(ptr == NULL);
451
452
453 if (length == TCPOLEN_TSTAMP_ALIGNED
454 && *(__be32 *)ptr == htonl((TCPOPT_NOP << 24)
455 | (TCPOPT_NOP << 16)
456 | (TCPOPT_TIMESTAMP << 8)
457 | TCPOLEN_TIMESTAMP))
458 return;
459
460 while (length > 0) {
461 int opcode = *ptr++;
462 int opsize, i;
463
464 switch (opcode) {
465 case TCPOPT_EOL:
466 return;
467 case TCPOPT_NOP:
468 length--;
469 continue;
470 default:
471 opsize = *ptr++;
472 if (opsize < 2)
473 return;
474 if (opsize > length)
475 return;
476
477 if (opcode == TCPOPT_SACK
478 && opsize >= (TCPOLEN_SACK_BASE
479 + TCPOLEN_SACK_PERBLOCK)
480 && !((opsize - TCPOLEN_SACK_BASE)
481 % TCPOLEN_SACK_PERBLOCK)) {
482 for (i = 0;
483 i < (opsize - TCPOLEN_SACK_BASE);
484 i += TCPOLEN_SACK_PERBLOCK) {
485 tmp = get_unaligned_be32((__be32 *)(ptr+i)+1);
486
487 if (after(tmp, *sack))
488 *sack = tmp;
489 }
490 return;
491 }
492 ptr += opsize - 2;
493 length -= opsize;
494 }
495 }
496}
497
498#ifdef CONFIG_NF_NAT_NEEDED
499static inline s16 nat_offset(const struct nf_conn *ct,
500 enum ip_conntrack_dir dir,
501 u32 seq)
502{
503 typeof(nf_ct_nat_offset) get_offset = rcu_dereference(nf_ct_nat_offset);
504
505 return get_offset != NULL ? get_offset(ct, dir, seq) : 0;
506}
507#define NAT_OFFSET(ct, dir, seq) \
508 (nat_offset(ct, dir, seq))
509#else
510#define NAT_OFFSET(ct, dir, seq) 0
511#endif
512
513static bool tcp_in_window(const struct nf_conn *ct,
514 struct ip_ct_tcp *state,
515 enum ip_conntrack_dir dir,
516 unsigned int index,
517 const struct sk_buff *skb,
518 unsigned int dataoff,
519 const struct tcphdr *tcph,
520 u_int8_t pf)
521{
522 struct net *net = nf_ct_net(ct);
523 struct nf_tcp_net *tn = tcp_pernet(net);
524 struct ip_ct_tcp_state *sender = &state->seen[dir];
525 struct ip_ct_tcp_state *receiver = &state->seen[!dir];
526 const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
527 __u32 seq, ack, sack, end, win, swin;
528 s16 receiver_offset;
529 bool res, in_recv_win;
530
531
532
533
534 seq = ntohl(tcph->seq);
535 ack = sack = ntohl(tcph->ack_seq);
536 win = ntohs(tcph->window);
537 end = segment_seq_plus_len(seq, skb->len, dataoff, tcph);
538
539 if (receiver->flags & IP_CT_TCP_FLAG_SACK_PERM)
540 tcp_sack(skb, dataoff, tcph, &sack);
541
542
543 receiver_offset = NAT_OFFSET(ct, !dir, ack - 1);
544 ack -= receiver_offset;
545 sack -= receiver_offset;
546
547 pr_debug("tcp_in_window: START\n");
548 pr_debug("tcp_in_window: ");
549 nf_ct_dump_tuple(tuple);
550 pr_debug("seq=%u ack=%u+(%d) sack=%u+(%d) win=%u end=%u\n",
551 seq, ack, receiver_offset, sack, receiver_offset, win, end);
552 pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
553 "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
554 sender->td_end, sender->td_maxend, sender->td_maxwin,
555 sender->td_scale,
556 receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
557 receiver->td_scale);
558
559 if (sender->td_maxwin == 0) {
560
561
562
563 if (tcph->syn) {
564
565
566
567
568 sender->td_end =
569 sender->td_maxend = end;
570 sender->td_maxwin = (win == 0 ? 1 : win);
571
572 tcp_options(skb, dataoff, tcph, sender);
573
574
575
576
577
578 if (!(sender->flags & IP_CT_TCP_FLAG_WINDOW_SCALE
579 && receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE))
580 sender->td_scale =
581 receiver->td_scale = 0;
582 if (!tcph->ack)
583
584 return true;
585 } else {
586
587
588
589
590
591 sender->td_end = end;
592 swin = win << sender->td_scale;
593 sender->td_maxwin = (swin == 0 ? 1 : swin);
594 sender->td_maxend = end + sender->td_maxwin;
595
596
597
598
599
600 if (receiver->td_maxwin == 0)
601 receiver->td_end = receiver->td_maxend = sack;
602 }
603 } else if (((state->state == TCP_CONNTRACK_SYN_SENT
604 && dir == IP_CT_DIR_ORIGINAL)
605 || (state->state == TCP_CONNTRACK_SYN_RECV
606 && dir == IP_CT_DIR_REPLY))
607 && after(end, sender->td_end)) {
608
609
610
611
612
613 sender->td_end =
614 sender->td_maxend = end;
615 sender->td_maxwin = (win == 0 ? 1 : win);
616
617 tcp_options(skb, dataoff, tcph, sender);
618 }
619
620 if (!(tcph->ack)) {
621
622
623
624 ack = sack = receiver->td_end;
625 } else if (((tcp_flag_word(tcph) & (TCP_FLAG_ACK|TCP_FLAG_RST)) ==
626 (TCP_FLAG_ACK|TCP_FLAG_RST))
627 && (ack == 0)) {
628
629
630
631
632 ack = sack = receiver->td_end;
633 }
634
635 if (tcph->rst && seq == 0 && state->state == TCP_CONNTRACK_SYN_SENT)
636
637
638
639 seq = end = sender->td_end;
640
641 pr_debug("tcp_in_window: ");
642 nf_ct_dump_tuple(tuple);
643 pr_debug("seq=%u ack=%u+(%d) sack=%u+(%d) win=%u end=%u\n",
644 seq, ack, receiver_offset, sack, receiver_offset, win, end);
645 pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
646 "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
647 sender->td_end, sender->td_maxend, sender->td_maxwin,
648 sender->td_scale,
649 receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
650 receiver->td_scale);
651
652
653 in_recv_win = !receiver->td_maxwin ||
654 after(end, sender->td_end - receiver->td_maxwin - 1);
655
656 pr_debug("tcp_in_window: I=%i II=%i III=%i IV=%i\n",
657 before(seq, sender->td_maxend + 1),
658 (in_recv_win ? 1 : 0),
659 before(sack, receiver->td_end + 1),
660 after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1));
661
662 if (before(seq, sender->td_maxend + 1) &&
663 in_recv_win &&
664 before(sack, receiver->td_end + 1) &&
665 after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1)) {
666
667
668
669 if (!tcph->syn)
670 win <<= sender->td_scale;
671
672
673
674
675 swin = win + (sack - ack);
676 if (sender->td_maxwin < swin)
677 sender->td_maxwin = swin;
678 if (after(end, sender->td_end)) {
679 sender->td_end = end;
680 sender->flags |= IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED;
681 }
682 if (tcph->ack) {
683 if (!(sender->flags & IP_CT_TCP_FLAG_MAXACK_SET)) {
684 sender->td_maxack = ack;
685 sender->flags |= IP_CT_TCP_FLAG_MAXACK_SET;
686 } else if (after(ack, sender->td_maxack))
687 sender->td_maxack = ack;
688 }
689
690
691
692
693 if (receiver->td_maxwin != 0 && after(end, sender->td_maxend))
694 receiver->td_maxwin += end - sender->td_maxend;
695 if (after(sack + win, receiver->td_maxend - 1)) {
696 receiver->td_maxend = sack + win;
697 if (win == 0)
698 receiver->td_maxend++;
699 }
700 if (ack == receiver->td_end)
701 receiver->flags &= ~IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED;
702
703
704
705
706 if (index == TCP_ACK_SET) {
707 if (state->last_dir == dir
708 && state->last_seq == seq
709 && state->last_ack == ack
710 && state->last_end == end
711 && state->last_win == win)
712 state->retrans++;
713 else {
714 state->last_dir = dir;
715 state->last_seq = seq;
716 state->last_ack = ack;
717 state->last_end = end;
718 state->last_win = win;
719 state->retrans = 0;
720 }
721 }
722 res = true;
723 } else {
724 res = false;
725 if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL ||
726 tn->tcp_be_liberal)
727 res = true;
728 if (!res && LOG_INVALID(net, IPPROTO_TCP))
729 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
730 "nf_ct_tcp: %s ",
731 before(seq, sender->td_maxend + 1) ?
732 in_recv_win ?
733 before(sack, receiver->td_end + 1) ?
734 after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1) ? "BUG"
735 : "ACK is under the lower bound (possible overly delayed ACK)"
736 : "ACK is over the upper bound (ACKed data not seen yet)"
737 : "SEQ is under the lower bound (already ACKed data retransmitted)"
738 : "SEQ is over the upper bound (over the window of the receiver)");
739 }
740
741 pr_debug("tcp_in_window: res=%u sender end=%u maxend=%u maxwin=%u "
742 "receiver end=%u maxend=%u maxwin=%u\n",
743 res, sender->td_end, sender->td_maxend, sender->td_maxwin,
744 receiver->td_end, receiver->td_maxend, receiver->td_maxwin);
745
746 return res;
747}
748
749
750static const u8 tcp_valid_flags[(TCPHDR_FIN|TCPHDR_SYN|TCPHDR_RST|TCPHDR_ACK|
751 TCPHDR_URG) + 1] =
752{
753 [TCPHDR_SYN] = 1,
754 [TCPHDR_SYN|TCPHDR_URG] = 1,
755 [TCPHDR_SYN|TCPHDR_ACK] = 1,
756 [TCPHDR_RST] = 1,
757 [TCPHDR_RST|TCPHDR_ACK] = 1,
758 [TCPHDR_FIN|TCPHDR_ACK] = 1,
759 [TCPHDR_FIN|TCPHDR_ACK|TCPHDR_URG] = 1,
760 [TCPHDR_ACK] = 1,
761 [TCPHDR_ACK|TCPHDR_URG] = 1,
762};
763
764
765static int tcp_error(struct net *net, struct nf_conn *tmpl,
766 struct sk_buff *skb,
767 unsigned int dataoff,
768 enum ip_conntrack_info *ctinfo,
769 u_int8_t pf,
770 unsigned int hooknum)
771{
772 const struct tcphdr *th;
773 struct tcphdr _tcph;
774 unsigned int tcplen = skb->len - dataoff;
775 u_int8_t tcpflags;
776
777
778 th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph);
779 if (th == NULL) {
780 if (LOG_INVALID(net, IPPROTO_TCP))
781 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
782 "nf_ct_tcp: short packet ");
783 return -NF_ACCEPT;
784 }
785
786
787 if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) {
788 if (LOG_INVALID(net, IPPROTO_TCP))
789 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
790 "nf_ct_tcp: truncated/malformed packet ");
791 return -NF_ACCEPT;
792 }
793
794
795
796
797
798
799 if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
800 nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) {
801 if (LOG_INVALID(net, IPPROTO_TCP))
802 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
803 "nf_ct_tcp: bad TCP checksum ");
804 return -NF_ACCEPT;
805 }
806
807
808 tcpflags = (tcp_flag_byte(th) & ~(TCPHDR_ECE|TCPHDR_CWR|TCPHDR_PSH));
809 if (!tcp_valid_flags[tcpflags]) {
810 if (LOG_INVALID(net, IPPROTO_TCP))
811 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
812 "nf_ct_tcp: invalid TCP flag combination ");
813 return -NF_ACCEPT;
814 }
815
816 return NF_ACCEPT;
817}
818
819static unsigned int *tcp_get_timeouts(struct net *net)
820{
821 return tcp_pernet(net)->timeouts;
822}
823
824
825static int tcp_packet(struct nf_conn *ct,
826 const struct sk_buff *skb,
827 unsigned int dataoff,
828 enum ip_conntrack_info ctinfo,
829 u_int8_t pf,
830 unsigned int hooknum,
831 unsigned int *timeouts)
832{
833 struct net *net = nf_ct_net(ct);
834 struct nf_tcp_net *tn = tcp_pernet(net);
835 struct nf_conntrack_tuple *tuple;
836 enum tcp_conntrack new_state, old_state;
837 enum ip_conntrack_dir dir;
838 const struct tcphdr *th;
839 struct tcphdr _tcph;
840 unsigned long timeout;
841 unsigned int index;
842
843 th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph);
844 BUG_ON(th == NULL);
845
846 spin_lock_bh(&ct->lock);
847 old_state = ct->proto.tcp.state;
848 dir = CTINFO2DIR(ctinfo);
849 index = get_conntrack_index(th);
850 new_state = tcp_conntracks[dir][index][old_state];
851 tuple = &ct->tuplehash[dir].tuple;
852
853 switch (new_state) {
854 case TCP_CONNTRACK_SYN_SENT:
855 if (old_state < TCP_CONNTRACK_TIME_WAIT)
856 break;
857
858
859
860
861
862
863
864
865
866
867
868
869 if (((ct->proto.tcp.seen[dir].flags
870 | ct->proto.tcp.seen[!dir].flags)
871 & IP_CT_TCP_FLAG_CLOSE_INIT)
872 || (ct->proto.tcp.last_dir == dir
873 && ct->proto.tcp.last_index == TCP_RST_SET)) {
874
875
876 spin_unlock_bh(&ct->lock);
877
878
879
880
881
882 if (nf_ct_kill(ct))
883 return -NF_REPEAT;
884 return NF_DROP;
885 }
886
887 case TCP_CONNTRACK_IGNORE:
888
889
890
891
892
893
894
895
896
897
898
899
900
901 if (index == TCP_SYNACK_SET
902 && ct->proto.tcp.last_index == TCP_SYN_SET
903 && ct->proto.tcp.last_dir != dir
904 && ntohl(th->ack_seq) == ct->proto.tcp.last_end) {
905
906
907
908
909
910
911 old_state = TCP_CONNTRACK_SYN_SENT;
912 new_state = TCP_CONNTRACK_SYN_RECV;
913 ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_end =
914 ct->proto.tcp.last_end;
915 ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_maxend =
916 ct->proto.tcp.last_end;
917 ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_maxwin =
918 ct->proto.tcp.last_win == 0 ?
919 1 : ct->proto.tcp.last_win;
920 ct->proto.tcp.seen[ct->proto.tcp.last_dir].td_scale =
921 ct->proto.tcp.last_wscale;
922 ct->proto.tcp.seen[ct->proto.tcp.last_dir].flags =
923 ct->proto.tcp.last_flags;
924 memset(&ct->proto.tcp.seen[dir], 0,
925 sizeof(struct ip_ct_tcp_state));
926 break;
927 }
928 ct->proto.tcp.last_index = index;
929 ct->proto.tcp.last_dir = dir;
930 ct->proto.tcp.last_seq = ntohl(th->seq);
931 ct->proto.tcp.last_end =
932 segment_seq_plus_len(ntohl(th->seq), skb->len, dataoff, th);
933 ct->proto.tcp.last_win = ntohs(th->window);
934
935
936
937
938
939
940 if (index == TCP_SYN_SET && dir == IP_CT_DIR_ORIGINAL) {
941 struct ip_ct_tcp_state seen = {};
942
943 ct->proto.tcp.last_flags =
944 ct->proto.tcp.last_wscale = 0;
945 tcp_options(skb, dataoff, th, &seen);
946 if (seen.flags & IP_CT_TCP_FLAG_WINDOW_SCALE) {
947 ct->proto.tcp.last_flags |=
948 IP_CT_TCP_FLAG_WINDOW_SCALE;
949 ct->proto.tcp.last_wscale = seen.td_scale;
950 }
951 if (seen.flags & IP_CT_TCP_FLAG_SACK_PERM) {
952 ct->proto.tcp.last_flags |=
953 IP_CT_TCP_FLAG_SACK_PERM;
954 }
955 }
956 spin_unlock_bh(&ct->lock);
957 if (LOG_INVALID(net, IPPROTO_TCP))
958 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
959 "nf_ct_tcp: invalid packet ignored in "
960 "state %s ", tcp_conntrack_names[old_state]);
961 return NF_ACCEPT;
962 case TCP_CONNTRACK_MAX:
963
964 pr_debug("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n",
965 dir, get_conntrack_index(th), old_state);
966 spin_unlock_bh(&ct->lock);
967 if (LOG_INVALID(net, IPPROTO_TCP))
968 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
969 "nf_ct_tcp: invalid state ");
970 return -NF_ACCEPT;
971 case TCP_CONNTRACK_CLOSE:
972 if (index == TCP_RST_SET
973 && (ct->proto.tcp.seen[!dir].flags & IP_CT_TCP_FLAG_MAXACK_SET)
974 && before(ntohl(th->seq), ct->proto.tcp.seen[!dir].td_maxack)) {
975
976 spin_unlock_bh(&ct->lock);
977 if (LOG_INVALID(net, IPPROTO_TCP))
978 nf_log_packet(net, pf, 0, skb, NULL, NULL,
979 NULL, "nf_ct_tcp: invalid RST ");
980 return -NF_ACCEPT;
981 }
982 if (index == TCP_RST_SET
983 && ((test_bit(IPS_SEEN_REPLY_BIT, &ct->status)
984 && ct->proto.tcp.last_index == TCP_SYN_SET)
985 || (!test_bit(IPS_ASSURED_BIT, &ct->status)
986 && ct->proto.tcp.last_index == TCP_ACK_SET))
987 && ntohl(th->ack_seq) == ct->proto.tcp.last_end) {
988
989
990
991
992
993
994
995
996
997 goto in_window;
998 }
999
1000 default:
1001
1002 break;
1003 }
1004
1005 if (!tcp_in_window(ct, &ct->proto.tcp, dir, index,
1006 skb, dataoff, th, pf)) {
1007 spin_unlock_bh(&ct->lock);
1008 return -NF_ACCEPT;
1009 }
1010 in_window:
1011
1012 ct->proto.tcp.last_index = index;
1013 ct->proto.tcp.last_dir = dir;
1014
1015 pr_debug("tcp_conntracks: ");
1016 nf_ct_dump_tuple(tuple);
1017 pr_debug("syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n",
1018 (th->syn ? 1 : 0), (th->ack ? 1 : 0),
1019 (th->fin ? 1 : 0), (th->rst ? 1 : 0),
1020 old_state, new_state);
1021
1022 ct->proto.tcp.state = new_state;
1023 if (old_state != new_state
1024 && new_state == TCP_CONNTRACK_FIN_WAIT)
1025 ct->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT;
1026
1027 if (ct->proto.tcp.retrans >= tn->tcp_max_retrans &&
1028 timeouts[new_state] > timeouts[TCP_CONNTRACK_RETRANS])
1029 timeout = timeouts[TCP_CONNTRACK_RETRANS];
1030 else if ((ct->proto.tcp.seen[0].flags | ct->proto.tcp.seen[1].flags) &
1031 IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED &&
1032 timeouts[new_state] > timeouts[TCP_CONNTRACK_UNACK])
1033 timeout = timeouts[TCP_CONNTRACK_UNACK];
1034 else
1035 timeout = timeouts[new_state];
1036 spin_unlock_bh(&ct->lock);
1037
1038 if (new_state != old_state)
1039 nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
1040
1041 if (!test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
1042
1043
1044
1045
1046 if (th->rst) {
1047 nf_ct_kill_acct(ct, ctinfo, skb);
1048 return NF_ACCEPT;
1049 }
1050
1051
1052
1053 if (new_state == TCP_CONNTRACK_ESTABLISHED &&
1054 timeout > timeouts[TCP_CONNTRACK_UNACK])
1055 timeout = timeouts[TCP_CONNTRACK_UNACK];
1056 } else if (!test_bit(IPS_ASSURED_BIT, &ct->status)
1057 && (old_state == TCP_CONNTRACK_SYN_RECV
1058 || old_state == TCP_CONNTRACK_ESTABLISHED)
1059 && new_state == TCP_CONNTRACK_ESTABLISHED) {
1060
1061
1062
1063 set_bit(IPS_ASSURED_BIT, &ct->status);
1064 nf_conntrack_event_cache(IPCT_ASSURED, ct);
1065 }
1066 nf_ct_refresh_acct(ct, ctinfo, skb, timeout);
1067
1068 return NF_ACCEPT;
1069}
1070
1071
1072static bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb,
1073 unsigned int dataoff, unsigned int *timeouts)
1074{
1075 enum tcp_conntrack new_state;
1076 const struct tcphdr *th;
1077 struct tcphdr _tcph;
1078 struct net *net = nf_ct_net(ct);
1079 struct nf_tcp_net *tn = tcp_pernet(net);
1080 const struct ip_ct_tcp_state *sender = &ct->proto.tcp.seen[0];
1081 const struct ip_ct_tcp_state *receiver = &ct->proto.tcp.seen[1];
1082
1083 th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph);
1084 BUG_ON(th == NULL);
1085
1086
1087 new_state = tcp_conntracks[0][get_conntrack_index(th)][TCP_CONNTRACK_NONE];
1088
1089
1090 if (new_state >= TCP_CONNTRACK_MAX) {
1091 pr_debug("nf_ct_tcp: invalid new deleting.\n");
1092 return false;
1093 }
1094
1095 if (new_state == TCP_CONNTRACK_SYN_SENT) {
1096 memset(&ct->proto.tcp, 0, sizeof(ct->proto.tcp));
1097
1098 ct->proto.tcp.seen[0].td_end =
1099 segment_seq_plus_len(ntohl(th->seq), skb->len,
1100 dataoff, th);
1101 ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window);
1102 if (ct->proto.tcp.seen[0].td_maxwin == 0)
1103 ct->proto.tcp.seen[0].td_maxwin = 1;
1104 ct->proto.tcp.seen[0].td_maxend =
1105 ct->proto.tcp.seen[0].td_end;
1106
1107 tcp_options(skb, dataoff, th, &ct->proto.tcp.seen[0]);
1108 } else if (tn->tcp_loose == 0) {
1109
1110 return false;
1111 } else {
1112 memset(&ct->proto.tcp, 0, sizeof(ct->proto.tcp));
1113
1114
1115
1116
1117
1118 ct->proto.tcp.seen[0].td_end =
1119 segment_seq_plus_len(ntohl(th->seq), skb->len,
1120 dataoff, th);
1121 ct->proto.tcp.seen[0].td_maxwin = ntohs(th->window);
1122 if (ct->proto.tcp.seen[0].td_maxwin == 0)
1123 ct->proto.tcp.seen[0].td_maxwin = 1;
1124 ct->proto.tcp.seen[0].td_maxend =
1125 ct->proto.tcp.seen[0].td_end +
1126 ct->proto.tcp.seen[0].td_maxwin;
1127
1128
1129
1130 ct->proto.tcp.seen[0].flags =
1131 ct->proto.tcp.seen[1].flags = IP_CT_TCP_FLAG_SACK_PERM |
1132 IP_CT_TCP_FLAG_BE_LIBERAL;
1133 }
1134
1135
1136 ct->proto.tcp.last_index = TCP_NONE_SET;
1137
1138 pr_debug("tcp_new: sender end=%u maxend=%u maxwin=%u scale=%i "
1139 "receiver end=%u maxend=%u maxwin=%u scale=%i\n",
1140 sender->td_end, sender->td_maxend, sender->td_maxwin,
1141 sender->td_scale,
1142 receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
1143 receiver->td_scale);
1144 return true;
1145}
1146
1147#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
1148
1149#include <linux/netfilter/nfnetlink.h>
1150#include <linux/netfilter/nfnetlink_conntrack.h>
1151
1152static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
1153 struct nf_conn *ct)
1154{
1155 struct nlattr *nest_parms;
1156 struct nf_ct_tcp_flags tmp = {};
1157
1158 spin_lock_bh(&ct->lock);
1159 nest_parms = nla_nest_start(skb, CTA_PROTOINFO_TCP | NLA_F_NESTED);
1160 if (!nest_parms)
1161 goto nla_put_failure;
1162
1163 if (nla_put_u8(skb, CTA_PROTOINFO_TCP_STATE, ct->proto.tcp.state) ||
1164 nla_put_u8(skb, CTA_PROTOINFO_TCP_WSCALE_ORIGINAL,
1165 ct->proto.tcp.seen[0].td_scale) ||
1166 nla_put_u8(skb, CTA_PROTOINFO_TCP_WSCALE_REPLY,
1167 ct->proto.tcp.seen[1].td_scale))
1168 goto nla_put_failure;
1169
1170 tmp.flags = ct->proto.tcp.seen[0].flags;
1171 if (nla_put(skb, CTA_PROTOINFO_TCP_FLAGS_ORIGINAL,
1172 sizeof(struct nf_ct_tcp_flags), &tmp))
1173 goto nla_put_failure;
1174
1175 tmp.flags = ct->proto.tcp.seen[1].flags;
1176 if (nla_put(skb, CTA_PROTOINFO_TCP_FLAGS_REPLY,
1177 sizeof(struct nf_ct_tcp_flags), &tmp))
1178 goto nla_put_failure;
1179 spin_unlock_bh(&ct->lock);
1180
1181 nla_nest_end(skb, nest_parms);
1182
1183 return 0;
1184
1185nla_put_failure:
1186 spin_unlock_bh(&ct->lock);
1187 return -1;
1188}
1189
1190static const struct nla_policy tcp_nla_policy[CTA_PROTOINFO_TCP_MAX+1] = {
1191 [CTA_PROTOINFO_TCP_STATE] = { .type = NLA_U8 },
1192 [CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] = { .type = NLA_U8 },
1193 [CTA_PROTOINFO_TCP_WSCALE_REPLY] = { .type = NLA_U8 },
1194 [CTA_PROTOINFO_TCP_FLAGS_ORIGINAL] = { .len = sizeof(struct nf_ct_tcp_flags) },
1195 [CTA_PROTOINFO_TCP_FLAGS_REPLY] = { .len = sizeof(struct nf_ct_tcp_flags) },
1196};
1197
1198static int nlattr_to_tcp(struct nlattr *cda[], struct nf_conn *ct)
1199{
1200 struct nlattr *pattr = cda[CTA_PROTOINFO_TCP];
1201 struct nlattr *tb[CTA_PROTOINFO_TCP_MAX+1];
1202 int err;
1203
1204
1205
1206 if (!pattr)
1207 return 0;
1208
1209 err = nla_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, pattr, tcp_nla_policy);
1210 if (err < 0)
1211 return err;
1212
1213 if (tb[CTA_PROTOINFO_TCP_STATE] &&
1214 nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]) >= TCP_CONNTRACK_MAX)
1215 return -EINVAL;
1216
1217 spin_lock_bh(&ct->lock);
1218 if (tb[CTA_PROTOINFO_TCP_STATE])
1219 ct->proto.tcp.state = nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]);
1220
1221 if (tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]) {
1222 struct nf_ct_tcp_flags *attr =
1223 nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]);
1224 ct->proto.tcp.seen[0].flags &= ~attr->mask;
1225 ct->proto.tcp.seen[0].flags |= attr->flags & attr->mask;
1226 }
1227
1228 if (tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]) {
1229 struct nf_ct_tcp_flags *attr =
1230 nla_data(tb[CTA_PROTOINFO_TCP_FLAGS_REPLY]);
1231 ct->proto.tcp.seen[1].flags &= ~attr->mask;
1232 ct->proto.tcp.seen[1].flags |= attr->flags & attr->mask;
1233 }
1234
1235 if (tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] &&
1236 tb[CTA_PROTOINFO_TCP_WSCALE_REPLY] &&
1237 ct->proto.tcp.seen[0].flags & IP_CT_TCP_FLAG_WINDOW_SCALE &&
1238 ct->proto.tcp.seen[1].flags & IP_CT_TCP_FLAG_WINDOW_SCALE) {
1239 ct->proto.tcp.seen[0].td_scale =
1240 nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_ORIGINAL]);
1241 ct->proto.tcp.seen[1].td_scale =
1242 nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_REPLY]);
1243 }
1244 spin_unlock_bh(&ct->lock);
1245
1246 return 0;
1247}
1248
1249static int tcp_nlattr_size(void)
1250{
1251 return nla_total_size(0)
1252 + nla_policy_len(tcp_nla_policy, CTA_PROTOINFO_TCP_MAX + 1);
1253}
1254
1255static int tcp_nlattr_tuple_size(void)
1256{
1257 return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1);
1258}
1259#endif
1260
1261#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
1262
1263#include <linux/netfilter/nfnetlink.h>
1264#include <linux/netfilter/nfnetlink_cttimeout.h>
1265
1266static int tcp_timeout_nlattr_to_obj(struct nlattr *tb[],
1267 struct net *net, void *data)
1268{
1269 unsigned int *timeouts = data;
1270 struct nf_tcp_net *tn = tcp_pernet(net);
1271 int i;
1272
1273
1274 for (i=0; i<TCP_CONNTRACK_TIMEOUT_MAX; i++)
1275 timeouts[i] = tn->timeouts[i];
1276
1277 if (tb[CTA_TIMEOUT_TCP_SYN_SENT]) {
1278 timeouts[TCP_CONNTRACK_SYN_SENT] =
1279 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_SENT]))*HZ;
1280 }
1281 if (tb[CTA_TIMEOUT_TCP_SYN_RECV]) {
1282 timeouts[TCP_CONNTRACK_SYN_RECV] =
1283 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_RECV]))*HZ;
1284 }
1285 if (tb[CTA_TIMEOUT_TCP_ESTABLISHED]) {
1286 timeouts[TCP_CONNTRACK_ESTABLISHED] =
1287 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_ESTABLISHED]))*HZ;
1288 }
1289 if (tb[CTA_TIMEOUT_TCP_FIN_WAIT]) {
1290 timeouts[TCP_CONNTRACK_FIN_WAIT] =
1291 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_FIN_WAIT]))*HZ;
1292 }
1293 if (tb[CTA_TIMEOUT_TCP_CLOSE_WAIT]) {
1294 timeouts[TCP_CONNTRACK_CLOSE_WAIT] =
1295 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_CLOSE_WAIT]))*HZ;
1296 }
1297 if (tb[CTA_TIMEOUT_TCP_LAST_ACK]) {
1298 timeouts[TCP_CONNTRACK_LAST_ACK] =
1299 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_LAST_ACK]))*HZ;
1300 }
1301 if (tb[CTA_TIMEOUT_TCP_TIME_WAIT]) {
1302 timeouts[TCP_CONNTRACK_TIME_WAIT] =
1303 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_TIME_WAIT]))*HZ;
1304 }
1305 if (tb[CTA_TIMEOUT_TCP_CLOSE]) {
1306 timeouts[TCP_CONNTRACK_CLOSE] =
1307 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_CLOSE]))*HZ;
1308 }
1309 if (tb[CTA_TIMEOUT_TCP_SYN_SENT2]) {
1310 timeouts[TCP_CONNTRACK_SYN_SENT2] =
1311 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_SENT2]))*HZ;
1312 }
1313 if (tb[CTA_TIMEOUT_TCP_RETRANS]) {
1314 timeouts[TCP_CONNTRACK_RETRANS] =
1315 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_RETRANS]))*HZ;
1316 }
1317 if (tb[CTA_TIMEOUT_TCP_UNACK]) {
1318 timeouts[TCP_CONNTRACK_UNACK] =
1319 ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_UNACK]))*HZ;
1320 }
1321 return 0;
1322}
1323
1324static int
1325tcp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
1326{
1327 const unsigned int *timeouts = data;
1328
1329 if (nla_put_be32(skb, CTA_TIMEOUT_TCP_SYN_SENT,
1330 htonl(timeouts[TCP_CONNTRACK_SYN_SENT] / HZ)) ||
1331 nla_put_be32(skb, CTA_TIMEOUT_TCP_SYN_RECV,
1332 htonl(timeouts[TCP_CONNTRACK_SYN_RECV] / HZ)) ||
1333 nla_put_be32(skb, CTA_TIMEOUT_TCP_ESTABLISHED,
1334 htonl(timeouts[TCP_CONNTRACK_ESTABLISHED] / HZ)) ||
1335 nla_put_be32(skb, CTA_TIMEOUT_TCP_FIN_WAIT,
1336 htonl(timeouts[TCP_CONNTRACK_FIN_WAIT] / HZ)) ||
1337 nla_put_be32(skb, CTA_TIMEOUT_TCP_CLOSE_WAIT,
1338 htonl(timeouts[TCP_CONNTRACK_CLOSE_WAIT] / HZ)) ||
1339 nla_put_be32(skb, CTA_TIMEOUT_TCP_LAST_ACK,
1340 htonl(timeouts[TCP_CONNTRACK_LAST_ACK] / HZ)) ||
1341 nla_put_be32(skb, CTA_TIMEOUT_TCP_TIME_WAIT,
1342 htonl(timeouts[TCP_CONNTRACK_TIME_WAIT] / HZ)) ||
1343 nla_put_be32(skb, CTA_TIMEOUT_TCP_CLOSE,
1344 htonl(timeouts[TCP_CONNTRACK_CLOSE] / HZ)) ||
1345 nla_put_be32(skb, CTA_TIMEOUT_TCP_SYN_SENT2,
1346 htonl(timeouts[TCP_CONNTRACK_SYN_SENT2] / HZ)) ||
1347 nla_put_be32(skb, CTA_TIMEOUT_TCP_RETRANS,
1348 htonl(timeouts[TCP_CONNTRACK_RETRANS] / HZ)) ||
1349 nla_put_be32(skb, CTA_TIMEOUT_TCP_UNACK,
1350 htonl(timeouts[TCP_CONNTRACK_UNACK] / HZ)))
1351 goto nla_put_failure;
1352 return 0;
1353
1354nla_put_failure:
1355 return -ENOSPC;
1356}
1357
1358static const struct nla_policy tcp_timeout_nla_policy[CTA_TIMEOUT_TCP_MAX+1] = {
1359 [CTA_TIMEOUT_TCP_SYN_SENT] = { .type = NLA_U32 },
1360 [CTA_TIMEOUT_TCP_SYN_RECV] = { .type = NLA_U32 },
1361 [CTA_TIMEOUT_TCP_ESTABLISHED] = { .type = NLA_U32 },
1362 [CTA_TIMEOUT_TCP_FIN_WAIT] = { .type = NLA_U32 },
1363 [CTA_TIMEOUT_TCP_CLOSE_WAIT] = { .type = NLA_U32 },
1364 [CTA_TIMEOUT_TCP_LAST_ACK] = { .type = NLA_U32 },
1365 [CTA_TIMEOUT_TCP_TIME_WAIT] = { .type = NLA_U32 },
1366 [CTA_TIMEOUT_TCP_CLOSE] = { .type = NLA_U32 },
1367 [CTA_TIMEOUT_TCP_SYN_SENT2] = { .type = NLA_U32 },
1368 [CTA_TIMEOUT_TCP_RETRANS] = { .type = NLA_U32 },
1369 [CTA_TIMEOUT_TCP_UNACK] = { .type = NLA_U32 },
1370};
1371#endif
1372
1373#ifdef CONFIG_SYSCTL
1374static struct ctl_table tcp_sysctl_table[] = {
1375 {
1376 .procname = "nf_conntrack_tcp_timeout_syn_sent",
1377 .maxlen = sizeof(unsigned int),
1378 .mode = 0644,
1379 .proc_handler = proc_dointvec_jiffies,
1380 },
1381 {
1382 .procname = "nf_conntrack_tcp_timeout_syn_recv",
1383 .maxlen = sizeof(unsigned int),
1384 .mode = 0644,
1385 .proc_handler = proc_dointvec_jiffies,
1386 },
1387 {
1388 .procname = "nf_conntrack_tcp_timeout_established",
1389 .maxlen = sizeof(unsigned int),
1390 .mode = 0644,
1391 .proc_handler = proc_dointvec_jiffies,
1392 },
1393 {
1394 .procname = "nf_conntrack_tcp_timeout_fin_wait",
1395 .maxlen = sizeof(unsigned int),
1396 .mode = 0644,
1397 .proc_handler = proc_dointvec_jiffies,
1398 },
1399 {
1400 .procname = "nf_conntrack_tcp_timeout_close_wait",
1401 .maxlen = sizeof(unsigned int),
1402 .mode = 0644,
1403 .proc_handler = proc_dointvec_jiffies,
1404 },
1405 {
1406 .procname = "nf_conntrack_tcp_timeout_last_ack",
1407 .maxlen = sizeof(unsigned int),
1408 .mode = 0644,
1409 .proc_handler = proc_dointvec_jiffies,
1410 },
1411 {
1412 .procname = "nf_conntrack_tcp_timeout_time_wait",
1413 .maxlen = sizeof(unsigned int),
1414 .mode = 0644,
1415 .proc_handler = proc_dointvec_jiffies,
1416 },
1417 {
1418 .procname = "nf_conntrack_tcp_timeout_close",
1419 .maxlen = sizeof(unsigned int),
1420 .mode = 0644,
1421 .proc_handler = proc_dointvec_jiffies,
1422 },
1423 {
1424 .procname = "nf_conntrack_tcp_timeout_max_retrans",
1425 .maxlen = sizeof(unsigned int),
1426 .mode = 0644,
1427 .proc_handler = proc_dointvec_jiffies,
1428 },
1429 {
1430 .procname = "nf_conntrack_tcp_timeout_unacknowledged",
1431 .maxlen = sizeof(unsigned int),
1432 .mode = 0644,
1433 .proc_handler = proc_dointvec_jiffies,
1434 },
1435 {
1436 .procname = "nf_conntrack_tcp_loose",
1437 .maxlen = sizeof(unsigned int),
1438 .mode = 0644,
1439 .proc_handler = proc_dointvec,
1440 },
1441 {
1442 .procname = "nf_conntrack_tcp_be_liberal",
1443 .maxlen = sizeof(unsigned int),
1444 .mode = 0644,
1445 .proc_handler = proc_dointvec,
1446 },
1447 {
1448 .procname = "nf_conntrack_tcp_max_retrans",
1449 .maxlen = sizeof(unsigned int),
1450 .mode = 0644,
1451 .proc_handler = proc_dointvec,
1452 },
1453 { }
1454};
1455
1456#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
1457static struct ctl_table tcp_compat_sysctl_table[] = {
1458 {
1459 .procname = "ip_conntrack_tcp_timeout_syn_sent",
1460 .maxlen = sizeof(unsigned int),
1461 .mode = 0644,
1462 .proc_handler = proc_dointvec_jiffies,
1463 },
1464 {
1465 .procname = "ip_conntrack_tcp_timeout_syn_sent2",
1466 .maxlen = sizeof(unsigned int),
1467 .mode = 0644,
1468 .proc_handler = proc_dointvec_jiffies,
1469 },
1470 {
1471 .procname = "ip_conntrack_tcp_timeout_syn_recv",
1472 .maxlen = sizeof(unsigned int),
1473 .mode = 0644,
1474 .proc_handler = proc_dointvec_jiffies,
1475 },
1476 {
1477 .procname = "ip_conntrack_tcp_timeout_established",
1478 .maxlen = sizeof(unsigned int),
1479 .mode = 0644,
1480 .proc_handler = proc_dointvec_jiffies,
1481 },
1482 {
1483 .procname = "ip_conntrack_tcp_timeout_fin_wait",
1484 .maxlen = sizeof(unsigned int),
1485 .mode = 0644,
1486 .proc_handler = proc_dointvec_jiffies,
1487 },
1488 {
1489 .procname = "ip_conntrack_tcp_timeout_close_wait",
1490 .maxlen = sizeof(unsigned int),
1491 .mode = 0644,
1492 .proc_handler = proc_dointvec_jiffies,
1493 },
1494 {
1495 .procname = "ip_conntrack_tcp_timeout_last_ack",
1496 .maxlen = sizeof(unsigned int),
1497 .mode = 0644,
1498 .proc_handler = proc_dointvec_jiffies,
1499 },
1500 {
1501 .procname = "ip_conntrack_tcp_timeout_time_wait",
1502 .maxlen = sizeof(unsigned int),
1503 .mode = 0644,
1504 .proc_handler = proc_dointvec_jiffies,
1505 },
1506 {
1507 .procname = "ip_conntrack_tcp_timeout_close",
1508 .maxlen = sizeof(unsigned int),
1509 .mode = 0644,
1510 .proc_handler = proc_dointvec_jiffies,
1511 },
1512 {
1513 .procname = "ip_conntrack_tcp_timeout_max_retrans",
1514 .maxlen = sizeof(unsigned int),
1515 .mode = 0644,
1516 .proc_handler = proc_dointvec_jiffies,
1517 },
1518 {
1519 .procname = "ip_conntrack_tcp_loose",
1520 .maxlen = sizeof(unsigned int),
1521 .mode = 0644,
1522 .proc_handler = proc_dointvec,
1523 },
1524 {
1525 .procname = "ip_conntrack_tcp_be_liberal",
1526 .maxlen = sizeof(unsigned int),
1527 .mode = 0644,
1528 .proc_handler = proc_dointvec,
1529 },
1530 {
1531 .procname = "ip_conntrack_tcp_max_retrans",
1532 .maxlen = sizeof(unsigned int),
1533 .mode = 0644,
1534 .proc_handler = proc_dointvec,
1535 },
1536 { }
1537};
1538#endif
1539#endif
1540
1541static int tcp_kmemdup_sysctl_table(struct nf_proto_net *pn,
1542 struct nf_tcp_net *tn)
1543{
1544#ifdef CONFIG_SYSCTL
1545 if (pn->ctl_table)
1546 return 0;
1547
1548 pn->ctl_table = kmemdup(tcp_sysctl_table,
1549 sizeof(tcp_sysctl_table),
1550 GFP_KERNEL);
1551 if (!pn->ctl_table)
1552 return -ENOMEM;
1553
1554 pn->ctl_table[0].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT];
1555 pn->ctl_table[1].data = &tn->timeouts[TCP_CONNTRACK_SYN_RECV];
1556 pn->ctl_table[2].data = &tn->timeouts[TCP_CONNTRACK_ESTABLISHED];
1557 pn->ctl_table[3].data = &tn->timeouts[TCP_CONNTRACK_FIN_WAIT];
1558 pn->ctl_table[4].data = &tn->timeouts[TCP_CONNTRACK_CLOSE_WAIT];
1559 pn->ctl_table[5].data = &tn->timeouts[TCP_CONNTRACK_LAST_ACK];
1560 pn->ctl_table[6].data = &tn->timeouts[TCP_CONNTRACK_TIME_WAIT];
1561 pn->ctl_table[7].data = &tn->timeouts[TCP_CONNTRACK_CLOSE];
1562 pn->ctl_table[8].data = &tn->timeouts[TCP_CONNTRACK_RETRANS];
1563 pn->ctl_table[9].data = &tn->timeouts[TCP_CONNTRACK_UNACK];
1564 pn->ctl_table[10].data = &tn->tcp_loose;
1565 pn->ctl_table[11].data = &tn->tcp_be_liberal;
1566 pn->ctl_table[12].data = &tn->tcp_max_retrans;
1567#endif
1568 return 0;
1569}
1570
1571static int tcp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn,
1572 struct nf_tcp_net *tn)
1573{
1574#ifdef CONFIG_SYSCTL
1575#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
1576 pn->ctl_compat_table = kmemdup(tcp_compat_sysctl_table,
1577 sizeof(tcp_compat_sysctl_table),
1578 GFP_KERNEL);
1579 if (!pn->ctl_compat_table)
1580 return -ENOMEM;
1581
1582 pn->ctl_compat_table[0].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT];
1583 pn->ctl_compat_table[1].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT2];
1584 pn->ctl_compat_table[2].data = &tn->timeouts[TCP_CONNTRACK_SYN_RECV];
1585 pn->ctl_compat_table[3].data = &tn->timeouts[TCP_CONNTRACK_ESTABLISHED];
1586 pn->ctl_compat_table[4].data = &tn->timeouts[TCP_CONNTRACK_FIN_WAIT];
1587 pn->ctl_compat_table[5].data = &tn->timeouts[TCP_CONNTRACK_CLOSE_WAIT];
1588 pn->ctl_compat_table[6].data = &tn->timeouts[TCP_CONNTRACK_LAST_ACK];
1589 pn->ctl_compat_table[7].data = &tn->timeouts[TCP_CONNTRACK_TIME_WAIT];
1590 pn->ctl_compat_table[8].data = &tn->timeouts[TCP_CONNTRACK_CLOSE];
1591 pn->ctl_compat_table[9].data = &tn->timeouts[TCP_CONNTRACK_RETRANS];
1592 pn->ctl_compat_table[10].data = &tn->tcp_loose;
1593 pn->ctl_compat_table[11].data = &tn->tcp_be_liberal;
1594 pn->ctl_compat_table[12].data = &tn->tcp_max_retrans;
1595#endif
1596#endif
1597 return 0;
1598}
1599
1600static int tcp_init_net(struct net *net, u_int16_t proto)
1601{
1602 int ret;
1603 struct nf_tcp_net *tn = tcp_pernet(net);
1604 struct nf_proto_net *pn = &tn->pn;
1605
1606 if (!pn->users) {
1607 int i;
1608
1609 for (i = 0; i < TCP_CONNTRACK_TIMEOUT_MAX; i++)
1610 tn->timeouts[i] = tcp_timeouts[i];
1611
1612 tn->tcp_loose = nf_ct_tcp_loose;
1613 tn->tcp_be_liberal = nf_ct_tcp_be_liberal;
1614 tn->tcp_max_retrans = nf_ct_tcp_max_retrans;
1615 }
1616
1617 if (proto == AF_INET) {
1618 ret = tcp_kmemdup_compat_sysctl_table(pn, tn);
1619 if (ret < 0)
1620 return ret;
1621
1622 ret = tcp_kmemdup_sysctl_table(pn, tn);
1623 if (ret < 0)
1624 nf_ct_kfree_compat_sysctl_table(pn);
1625 } else
1626 ret = tcp_kmemdup_sysctl_table(pn, tn);
1627
1628 return ret;
1629}
1630
1631static struct nf_proto_net *tcp_get_net_proto(struct net *net)
1632{
1633 return &net->ct.nf_ct_proto.tcp.pn;
1634}
1635
1636struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly =
1637{
1638 .l3proto = PF_INET,
1639 .l4proto = IPPROTO_TCP,
1640 .name = "tcp",
1641 .pkt_to_tuple = tcp_pkt_to_tuple,
1642 .invert_tuple = tcp_invert_tuple,
1643 .print_tuple = tcp_print_tuple,
1644 .print_conntrack = tcp_print_conntrack,
1645 .packet = tcp_packet,
1646 .get_timeouts = tcp_get_timeouts,
1647 .new = tcp_new,
1648 .error = tcp_error,
1649#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
1650 .to_nlattr = tcp_to_nlattr,
1651 .nlattr_size = tcp_nlattr_size,
1652 .from_nlattr = nlattr_to_tcp,
1653 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
1654 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
1655 .nlattr_tuple_size = tcp_nlattr_tuple_size,
1656 .nla_policy = nf_ct_port_nla_policy,
1657#endif
1658#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
1659 .ctnl_timeout = {
1660 .nlattr_to_obj = tcp_timeout_nlattr_to_obj,
1661 .obj_to_nlattr = tcp_timeout_obj_to_nlattr,
1662 .nlattr_max = CTA_TIMEOUT_TCP_MAX,
1663 .obj_size = sizeof(unsigned int) *
1664 TCP_CONNTRACK_TIMEOUT_MAX,
1665 .nla_policy = tcp_timeout_nla_policy,
1666 },
1667#endif
1668 .init_net = tcp_init_net,
1669 .get_net_proto = tcp_get_net_proto,
1670};
1671EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4);
1672
1673struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly =
1674{
1675 .l3proto = PF_INET6,
1676 .l4proto = IPPROTO_TCP,
1677 .name = "tcp",
1678 .pkt_to_tuple = tcp_pkt_to_tuple,
1679 .invert_tuple = tcp_invert_tuple,
1680 .print_tuple = tcp_print_tuple,
1681 .print_conntrack = tcp_print_conntrack,
1682 .packet = tcp_packet,
1683 .get_timeouts = tcp_get_timeouts,
1684 .new = tcp_new,
1685 .error = tcp_error,
1686#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
1687 .to_nlattr = tcp_to_nlattr,
1688 .nlattr_size = tcp_nlattr_size,
1689 .from_nlattr = nlattr_to_tcp,
1690 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
1691 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
1692 .nlattr_tuple_size = tcp_nlattr_tuple_size,
1693 .nla_policy = nf_ct_port_nla_policy,
1694#endif
1695#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
1696 .ctnl_timeout = {
1697 .nlattr_to_obj = tcp_timeout_nlattr_to_obj,
1698 .obj_to_nlattr = tcp_timeout_obj_to_nlattr,
1699 .nlattr_max = CTA_TIMEOUT_TCP_MAX,
1700 .obj_size = sizeof(unsigned int) *
1701 TCP_CONNTRACK_TIMEOUT_MAX,
1702 .nla_policy = tcp_timeout_nla_policy,
1703 },
1704#endif
1705 .init_net = tcp_init_net,
1706 .get_net_proto = tcp_get_net_proto,
1707};
1708EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6);
1709