[NETFILTER]: nf_conntrack_sctp: add ctnetlink support
[linux-2.6.git] / net / netfilter / nf_conntrack_proto_sctp.c
1 /*
2  * Connection tracking protocol helper module for SCTP.
3  *
4  * SCTP is defined in RFC 2960. References to various sections in this code
5  * are to this RFC.
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11
12 #include <linux/types.h>
13 #include <linux/timer.h>
14 #include <linux/netfilter.h>
15 #include <linux/module.h>
16 #include <linux/in.h>
17 #include <linux/ip.h>
18 #include <linux/sctp.h>
19 #include <linux/string.h>
20 #include <linux/seq_file.h>
21 #include <linux/spinlock.h>
22 #include <linux/interrupt.h>
23
24 #include <net/netfilter/nf_conntrack.h>
25 #include <net/netfilter/nf_conntrack_l4proto.h>
26 #include <net/netfilter/nf_conntrack_ecache.h>
27
28 /* Protects conntrack->proto.sctp */
29 static DEFINE_RWLOCK(sctp_lock);
30
31 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
32    closely.  They're more complex. --RR
33
34    And so for me for SCTP :D -Kiran */
35
36 static const char *sctp_conntrack_names[] = {
37         "NONE",
38         "CLOSED",
39         "COOKIE_WAIT",
40         "COOKIE_ECHOED",
41         "ESTABLISHED",
42         "SHUTDOWN_SENT",
43         "SHUTDOWN_RECD",
44         "SHUTDOWN_ACK_SENT",
45 };
46
47 #define SECS  * HZ
48 #define MINS  * 60 SECS
49 #define HOURS * 60 MINS
50 #define DAYS  * 24 HOURS
51
52 static unsigned int nf_ct_sctp_timeout_closed __read_mostly          =  10 SECS;
53 static unsigned int nf_ct_sctp_timeout_cookie_wait __read_mostly     =   3 SECS;
54 static unsigned int nf_ct_sctp_timeout_cookie_echoed __read_mostly   =   3 SECS;
55 static unsigned int nf_ct_sctp_timeout_established __read_mostly     =   5 DAYS;
56 static unsigned int nf_ct_sctp_timeout_shutdown_sent __read_mostly   = 300 SECS / 1000;
57 static unsigned int nf_ct_sctp_timeout_shutdown_recd __read_mostly   = 300 SECS / 1000;
58 static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
59
60 static unsigned int * sctp_timeouts[]
61 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
62     &nf_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
63     &nf_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
64     &nf_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
65     &nf_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
66     &nf_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
67     &nf_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
68     &nf_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
69  };
70
71 #define sNO SCTP_CONNTRACK_NONE
72 #define sCL SCTP_CONNTRACK_CLOSED
73 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
74 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
75 #define sES SCTP_CONNTRACK_ESTABLISHED
76 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
77 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
78 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
79 #define sIV SCTP_CONNTRACK_MAX
80
81 /*
82         These are the descriptions of the states:
83
84 NOTE: These state names are tantalizingly similar to the states of an
85 SCTP endpoint. But the interpretation of the states is a little different,
86 considering that these are the states of the connection and not of an end
87 point. Please note the subtleties. -Kiran
88
89 NONE              - Nothing so far.
90 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
91                     an INIT_ACK chunk in the reply direction.
92 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
93 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
94 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
95 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
96 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
97                     to that of the SHUTDOWN chunk.
98 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
99                     the SHUTDOWN chunk. Connection is closed.
100 */
101
102 /* TODO
103  - I have assumed that the first INIT is in the original direction.
104  This messes things when an INIT comes in the reply direction in CLOSED
105  state.
106  - Check the error type in the reply dir before transitioning from
107 cookie echoed to closed.
108  - Sec 5.2.4 of RFC 2960
109  - Multi Homing support.
110 */
111
112 /* SCTP conntrack state transitions */
113 static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
114         {
115 /*      ORIGINAL        */
116 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
117 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
118 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
119 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
120 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
121 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
122 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
123 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
124 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
125 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
126         },
127         {
128 /*      REPLY   */
129 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
130 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
131 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
132 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
133 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
134 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
135 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
136 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
137 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
138 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
139         }
140 };
141
142 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
143                              unsigned int dataoff,
144                              struct nf_conntrack_tuple *tuple)
145 {
146         sctp_sctphdr_t _hdr, *hp;
147
148         /* Actually only need first 8 bytes. */
149         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
150         if (hp == NULL)
151                 return 0;
152
153         tuple->src.u.sctp.port = hp->source;
154         tuple->dst.u.sctp.port = hp->dest;
155         return 1;
156 }
157
158 static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
159                              const struct nf_conntrack_tuple *orig)
160 {
161         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
162         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
163         return 1;
164 }
165
166 /* Print out the per-protocol part of the tuple. */
167 static int sctp_print_tuple(struct seq_file *s,
168                             const struct nf_conntrack_tuple *tuple)
169 {
170         return seq_printf(s, "sport=%hu dport=%hu ",
171                           ntohs(tuple->src.u.sctp.port),
172                           ntohs(tuple->dst.u.sctp.port));
173 }
174
175 /* Print out the private part of the conntrack. */
176 static int sctp_print_conntrack(struct seq_file *s,
177                                 const struct nf_conn *conntrack)
178 {
179         enum sctp_conntrack state;
180
181         read_lock_bh(&sctp_lock);
182         state = conntrack->proto.sctp.state;
183         read_unlock_bh(&sctp_lock);
184
185         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
186 }
187
188 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
189 for (offset = dataoff + sizeof(sctp_sctphdr_t), count = 0;              \
190         offset < skb->len &&                                            \
191         (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));   \
192         offset += (ntohs(sch->length) + 3) & ~3, count++)
193
194 /* Some validity checks to make sure the chunks are fine */
195 static int do_basic_checks(struct nf_conn *conntrack,
196                            const struct sk_buff *skb,
197                            unsigned int dataoff,
198                            char *map)
199 {
200         u_int32_t offset, count;
201         sctp_chunkhdr_t _sch, *sch;
202         int flag;
203
204         flag = 0;
205
206         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
207                 pr_debug("Chunk Num: %d  Type: %d\n", count, sch->type);
208
209                 if (sch->type == SCTP_CID_INIT
210                         || sch->type == SCTP_CID_INIT_ACK
211                         || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
212                         flag = 1;
213                 }
214
215                 /*
216                  * Cookie Ack/Echo chunks not the first OR
217                  * Init / Init Ack / Shutdown compl chunks not the only chunks
218                  * OR zero-length.
219                  */
220                 if (((sch->type == SCTP_CID_COOKIE_ACK
221                         || sch->type == SCTP_CID_COOKIE_ECHO
222                         || flag)
223                       && count !=0) || !sch->length) {
224                         pr_debug("Basic checks failed\n");
225                         return 1;
226                 }
227
228                 if (map) {
229                         set_bit(sch->type, (void *)map);
230                 }
231         }
232
233         pr_debug("Basic checks passed\n");
234         return count == 0;
235 }
236
237 static int new_state(enum ip_conntrack_dir dir,
238                      enum sctp_conntrack cur_state,
239                      int chunk_type)
240 {
241         int i;
242
243         pr_debug("Chunk type: %d\n", chunk_type);
244
245         switch (chunk_type) {
246                 case SCTP_CID_INIT:
247                         pr_debug("SCTP_CID_INIT\n");
248                         i = 0; break;
249                 case SCTP_CID_INIT_ACK:
250                         pr_debug("SCTP_CID_INIT_ACK\n");
251                         i = 1; break;
252                 case SCTP_CID_ABORT:
253                         pr_debug("SCTP_CID_ABORT\n");
254                         i = 2; break;
255                 case SCTP_CID_SHUTDOWN:
256                         pr_debug("SCTP_CID_SHUTDOWN\n");
257                         i = 3; break;
258                 case SCTP_CID_SHUTDOWN_ACK:
259                         pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
260                         i = 4; break;
261                 case SCTP_CID_ERROR:
262                         pr_debug("SCTP_CID_ERROR\n");
263                         i = 5; break;
264                 case SCTP_CID_COOKIE_ECHO:
265                         pr_debug("SCTP_CID_COOKIE_ECHO\n");
266                         i = 6; break;
267                 case SCTP_CID_COOKIE_ACK:
268                         pr_debug("SCTP_CID_COOKIE_ACK\n");
269                         i = 7; break;
270                 case SCTP_CID_SHUTDOWN_COMPLETE:
271                         pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
272                         i = 8; break;
273                 default:
274                         /* Other chunks like DATA, SACK, HEARTBEAT and
275                         its ACK do not cause a change in state */
276                         pr_debug("Unknown chunk type, Will stay in %s\n",
277                                  sctp_conntrack_names[cur_state]);
278                         return cur_state;
279         }
280
281         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
282                  dir, sctp_conntrack_names[cur_state], chunk_type,
283                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
284
285         return sctp_conntracks[dir][i][cur_state];
286 }
287
288 /* Returns verdict for packet, or -1 for invalid. */
289 static int sctp_packet(struct nf_conn *conntrack,
290                        const struct sk_buff *skb,
291                        unsigned int dataoff,
292                        enum ip_conntrack_info ctinfo,
293                        int pf,
294                        unsigned int hooknum)
295 {
296         enum sctp_conntrack newconntrack, oldsctpstate;
297         sctp_sctphdr_t _sctph, *sh;
298         sctp_chunkhdr_t _sch, *sch;
299         u_int32_t offset, count;
300         char map[256 / sizeof (char)] = {0};
301
302         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
303         if (sh == NULL)
304                 return -1;
305
306         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
307                 return -1;
308
309         /* Check the verification tag (Sec 8.5) */
310         if (!test_bit(SCTP_CID_INIT, (void *)map)
311                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
312                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
313                 && !test_bit(SCTP_CID_ABORT, (void *)map)
314                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
315                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
316                 pr_debug("Verification tag check failed\n");
317                 return -1;
318         }
319
320         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
321         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
322                 write_lock_bh(&sctp_lock);
323
324                 /* Special cases of Verification tag check (Sec 8.5.1) */
325                 if (sch->type == SCTP_CID_INIT) {
326                         /* Sec 8.5.1 (A) */
327                         if (sh->vtag != 0) {
328                                 write_unlock_bh(&sctp_lock);
329                                 return -1;
330                         }
331                 } else if (sch->type == SCTP_CID_ABORT) {
332                         /* Sec 8.5.1 (B) */
333                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
334                                 && !(sh->vtag == conntrack->proto.sctp.vtag
335                                                         [1 - CTINFO2DIR(ctinfo)])) {
336                                 write_unlock_bh(&sctp_lock);
337                                 return -1;
338                         }
339                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
340                         /* Sec 8.5.1 (C) */
341                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
342                                 && !(sh->vtag == conntrack->proto.sctp.vtag
343                                                         [1 - CTINFO2DIR(ctinfo)]
344                                         && (sch->flags & 1))) {
345                                 write_unlock_bh(&sctp_lock);
346                                 return -1;
347                         }
348                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
349                         /* Sec 8.5.1 (D) */
350                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
351                                 write_unlock_bh(&sctp_lock);
352                                 return -1;
353                         }
354                 }
355
356                 oldsctpstate = conntrack->proto.sctp.state;
357                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
358
359                 /* Invalid */
360                 if (newconntrack == SCTP_CONNTRACK_MAX) {
361                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
362                                  "conntrack=%u\n",
363                                  CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
364                         write_unlock_bh(&sctp_lock);
365                         return -1;
366                 }
367
368                 /* If it is an INIT or an INIT ACK note down the vtag */
369                 if (sch->type == SCTP_CID_INIT
370                         || sch->type == SCTP_CID_INIT_ACK) {
371                         sctp_inithdr_t _inithdr, *ih;
372
373                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
374                                                 sizeof(_inithdr), &_inithdr);
375                         if (ih == NULL) {
376                                         write_unlock_bh(&sctp_lock);
377                                         return -1;
378                         }
379                         pr_debug("Setting vtag %x for dir %d\n",
380                                  ih->init_tag, !CTINFO2DIR(ctinfo));
381                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
382                 }
383
384                 conntrack->proto.sctp.state = newconntrack;
385                 if (oldsctpstate != newconntrack)
386                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
387                 write_unlock_bh(&sctp_lock);
388         }
389
390         nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
391
392         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
393                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
394                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
395                 pr_debug("Setting assured bit\n");
396                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
397                 nf_conntrack_event_cache(IPCT_STATUS, skb);
398         }
399
400         return NF_ACCEPT;
401 }
402
403 /* Called when a new connection for this protocol found. */
404 static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
405                     unsigned int dataoff)
406 {
407         enum sctp_conntrack newconntrack;
408         sctp_sctphdr_t _sctph, *sh;
409         sctp_chunkhdr_t _sch, *sch;
410         u_int32_t offset, count;
411         char map[256 / sizeof (char)] = {0};
412
413         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
414         if (sh == NULL)
415                 return 0;
416
417         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
418                 return 0;
419
420         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
421         if ((test_bit (SCTP_CID_ABORT, (void *)map))
422                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
423                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
424                 return 0;
425         }
426
427         newconntrack = SCTP_CONNTRACK_MAX;
428         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
429                 /* Don't need lock here: this conntrack not in circulation yet */
430                 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
431                                          SCTP_CONNTRACK_NONE, sch->type);
432
433                 /* Invalid: delete conntrack */
434                 if (newconntrack == SCTP_CONNTRACK_NONE ||
435                     newconntrack == SCTP_CONNTRACK_MAX) {
436                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
437                         return 0;
438                 }
439
440                 /* Copy the vtag into the state info */
441                 if (sch->type == SCTP_CID_INIT) {
442                         if (sh->vtag == 0) {
443                                 sctp_inithdr_t _inithdr, *ih;
444
445                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
446                                                         sizeof(_inithdr), &_inithdr);
447                                 if (ih == NULL)
448                                         return 0;
449
450                                 pr_debug("Setting vtag %x for new conn\n",
451                                          ih->init_tag);
452
453                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
454                                                                 ih->init_tag;
455                         } else {
456                                 /* Sec 8.5.1 (A) */
457                                 return 0;
458                         }
459                 }
460                 /* If it is a shutdown ack OOTB packet, we expect a return
461                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
462                 else {
463                         pr_debug("Setting vtag %x for new conn OOTB\n",
464                                  sh->vtag);
465                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
466                 }
467
468                 conntrack->proto.sctp.state = newconntrack;
469         }
470
471         return 1;
472 }
473
474 #ifdef CONFIG_SYSCTL
475 static unsigned int sctp_sysctl_table_users;
476 static struct ctl_table_header *sctp_sysctl_header;
477 static struct ctl_table sctp_sysctl_table[] = {
478         {
479                 .procname       = "nf_conntrack_sctp_timeout_closed",
480                 .data           = &nf_ct_sctp_timeout_closed,
481                 .maxlen         = sizeof(unsigned int),
482                 .mode           = 0644,
483                 .proc_handler   = &proc_dointvec_jiffies,
484         },
485         {
486                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
487                 .data           = &nf_ct_sctp_timeout_cookie_wait,
488                 .maxlen         = sizeof(unsigned int),
489                 .mode           = 0644,
490                 .proc_handler   = &proc_dointvec_jiffies,
491         },
492         {
493                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
494                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
495                 .maxlen         = sizeof(unsigned int),
496                 .mode           = 0644,
497                 .proc_handler   = &proc_dointvec_jiffies,
498         },
499         {
500                 .procname       = "nf_conntrack_sctp_timeout_established",
501                 .data           = &nf_ct_sctp_timeout_established,
502                 .maxlen         = sizeof(unsigned int),
503                 .mode           = 0644,
504                 .proc_handler   = &proc_dointvec_jiffies,
505         },
506         {
507                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
508                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
509                 .maxlen         = sizeof(unsigned int),
510                 .mode           = 0644,
511                 .proc_handler   = &proc_dointvec_jiffies,
512         },
513         {
514                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
515                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
516                 .maxlen         = sizeof(unsigned int),
517                 .mode           = 0644,
518                 .proc_handler   = &proc_dointvec_jiffies,
519         },
520         {
521                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
522                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
523                 .maxlen         = sizeof(unsigned int),
524                 .mode           = 0644,
525                 .proc_handler   = &proc_dointvec_jiffies,
526         },
527         {
528                 .ctl_name = 0
529         }
530 };
531
532 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
533 static struct ctl_table sctp_compat_sysctl_table[] = {
534         {
535                 .procname       = "ip_conntrack_sctp_timeout_closed",
536                 .data           = &nf_ct_sctp_timeout_closed,
537                 .maxlen         = sizeof(unsigned int),
538                 .mode           = 0644,
539                 .proc_handler   = &proc_dointvec_jiffies,
540         },
541         {
542                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
543                 .data           = &nf_ct_sctp_timeout_cookie_wait,
544                 .maxlen         = sizeof(unsigned int),
545                 .mode           = 0644,
546                 .proc_handler   = &proc_dointvec_jiffies,
547         },
548         {
549                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
550                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
551                 .maxlen         = sizeof(unsigned int),
552                 .mode           = 0644,
553                 .proc_handler   = &proc_dointvec_jiffies,
554         },
555         {
556                 .procname       = "ip_conntrack_sctp_timeout_established",
557                 .data           = &nf_ct_sctp_timeout_established,
558                 .maxlen         = sizeof(unsigned int),
559                 .mode           = 0644,
560                 .proc_handler   = &proc_dointvec_jiffies,
561         },
562         {
563                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
564                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
565                 .maxlen         = sizeof(unsigned int),
566                 .mode           = 0644,
567                 .proc_handler   = &proc_dointvec_jiffies,
568         },
569         {
570                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
571                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
572                 .maxlen         = sizeof(unsigned int),
573                 .mode           = 0644,
574                 .proc_handler   = &proc_dointvec_jiffies,
575         },
576         {
577                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
578                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
579                 .maxlen         = sizeof(unsigned int),
580                 .mode           = 0644,
581                 .proc_handler   = &proc_dointvec_jiffies,
582         },
583         {
584                 .ctl_name = 0
585         }
586 };
587 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
588 #endif
589
590 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
591         .l3proto                = PF_INET,
592         .l4proto                = IPPROTO_SCTP,
593         .name                   = "sctp",
594         .pkt_to_tuple           = sctp_pkt_to_tuple,
595         .invert_tuple           = sctp_invert_tuple,
596         .print_tuple            = sctp_print_tuple,
597         .print_conntrack        = sctp_print_conntrack,
598         .packet                 = sctp_packet,
599         .new                    = sctp_new,
600         .me                     = THIS_MODULE,
601 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
602         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
603         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
604         .nla_policy             = nf_ct_port_nla_policy,
605 #endif
606 #ifdef CONFIG_SYSCTL
607         .ctl_table_users        = &sctp_sysctl_table_users,
608         .ctl_table_header       = &sctp_sysctl_header,
609         .ctl_table              = sctp_sysctl_table,
610 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
611         .ctl_compat_table       = sctp_compat_sysctl_table,
612 #endif
613 #endif
614 };
615
616 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
617         .l3proto                = PF_INET6,
618         .l4proto                = IPPROTO_SCTP,
619         .name                   = "sctp",
620         .pkt_to_tuple           = sctp_pkt_to_tuple,
621         .invert_tuple           = sctp_invert_tuple,
622         .print_tuple            = sctp_print_tuple,
623         .print_conntrack        = sctp_print_conntrack,
624         .packet                 = sctp_packet,
625         .new                    = sctp_new,
626         .me                     = THIS_MODULE,
627 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
628         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
629         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
630         .nla_policy             = nf_ct_port_nla_policy,
631 #endif
632 #ifdef CONFIG_SYSCTL
633         .ctl_table_users        = &sctp_sysctl_table_users,
634         .ctl_table_header       = &sctp_sysctl_header,
635         .ctl_table              = sctp_sysctl_table,
636 #endif
637 };
638
639 int __init nf_conntrack_proto_sctp_init(void)
640 {
641         int ret;
642
643         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
644         if (ret) {
645                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
646                 goto out;
647         }
648         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
649         if (ret) {
650                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
651                 goto cleanup_sctp4;
652         }
653
654         return ret;
655
656  cleanup_sctp4:
657         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
658  out:
659         return ret;
660 }
661
662 void __exit nf_conntrack_proto_sctp_fini(void)
663 {
664         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
665         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
666 }
667
668 module_init(nf_conntrack_proto_sctp_init);
669 module_exit(nf_conntrack_proto_sctp_fini);
670
671 MODULE_LICENSE("GPL");
672 MODULE_AUTHOR("Kiran Kumar Immidi");
673 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
674 MODULE_ALIAS("ip_conntrack_proto_sctp");