[NETFILTER]: {ip, nf}_conntrack_sctp: fix remotely triggerable NULL ptr dereference...
[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                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
480                 .procname       = "nf_conntrack_sctp_timeout_closed",
481                 .data           = &nf_ct_sctp_timeout_closed,
482                 .maxlen         = sizeof(unsigned int),
483                 .mode           = 0644,
484                 .proc_handler   = &proc_dointvec_jiffies,
485         },
486         {
487                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
488                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
489                 .data           = &nf_ct_sctp_timeout_cookie_wait,
490                 .maxlen         = sizeof(unsigned int),
491                 .mode           = 0644,
492                 .proc_handler   = &proc_dointvec_jiffies,
493         },
494         {
495                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
496                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
497                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
498                 .maxlen         = sizeof(unsigned int),
499                 .mode           = 0644,
500                 .proc_handler   = &proc_dointvec_jiffies,
501         },
502         {
503                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
504                 .procname       = "nf_conntrack_sctp_timeout_established",
505                 .data           = &nf_ct_sctp_timeout_established,
506                 .maxlen         = sizeof(unsigned int),
507                 .mode           = 0644,
508                 .proc_handler   = &proc_dointvec_jiffies,
509         },
510         {
511                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
512                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
513                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
514                 .maxlen         = sizeof(unsigned int),
515                 .mode           = 0644,
516                 .proc_handler   = &proc_dointvec_jiffies,
517         },
518         {
519                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
520                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
521                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
522                 .maxlen         = sizeof(unsigned int),
523                 .mode           = 0644,
524                 .proc_handler   = &proc_dointvec_jiffies,
525         },
526         {
527                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
528                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
529                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
530                 .maxlen         = sizeof(unsigned int),
531                 .mode           = 0644,
532                 .proc_handler   = &proc_dointvec_jiffies,
533         },
534         {
535                 .ctl_name = 0
536         }
537 };
538
539 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
540 static struct ctl_table sctp_compat_sysctl_table[] = {
541         {
542                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
543                 .procname       = "ip_conntrack_sctp_timeout_closed",
544                 .data           = &nf_ct_sctp_timeout_closed,
545                 .maxlen         = sizeof(unsigned int),
546                 .mode           = 0644,
547                 .proc_handler   = &proc_dointvec_jiffies,
548         },
549         {
550                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
551                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
552                 .data           = &nf_ct_sctp_timeout_cookie_wait,
553                 .maxlen         = sizeof(unsigned int),
554                 .mode           = 0644,
555                 .proc_handler   = &proc_dointvec_jiffies,
556         },
557         {
558                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
559                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
560                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
561                 .maxlen         = sizeof(unsigned int),
562                 .mode           = 0644,
563                 .proc_handler   = &proc_dointvec_jiffies,
564         },
565         {
566                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
567                 .procname       = "ip_conntrack_sctp_timeout_established",
568                 .data           = &nf_ct_sctp_timeout_established,
569                 .maxlen         = sizeof(unsigned int),
570                 .mode           = 0644,
571                 .proc_handler   = &proc_dointvec_jiffies,
572         },
573         {
574                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
575                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
576                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
577                 .maxlen         = sizeof(unsigned int),
578                 .mode           = 0644,
579                 .proc_handler   = &proc_dointvec_jiffies,
580         },
581         {
582                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
583                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
584                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
585                 .maxlen         = sizeof(unsigned int),
586                 .mode           = 0644,
587                 .proc_handler   = &proc_dointvec_jiffies,
588         },
589         {
590                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
591                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
592                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
593                 .maxlen         = sizeof(unsigned int),
594                 .mode           = 0644,
595                 .proc_handler   = &proc_dointvec_jiffies,
596         },
597         {
598                 .ctl_name = 0
599         }
600 };
601 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
602 #endif
603
604 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 = {
605         .l3proto                = PF_INET,
606         .l4proto                = IPPROTO_SCTP,
607         .name                   = "sctp",
608         .pkt_to_tuple           = sctp_pkt_to_tuple,
609         .invert_tuple           = sctp_invert_tuple,
610         .print_tuple            = sctp_print_tuple,
611         .print_conntrack        = sctp_print_conntrack,
612         .packet                 = sctp_packet,
613         .new                    = sctp_new,
614         .me                     = THIS_MODULE,
615 #ifdef CONFIG_SYSCTL
616         .ctl_table_users        = &sctp_sysctl_table_users,
617         .ctl_table_header       = &sctp_sysctl_header,
618         .ctl_table              = sctp_sysctl_table,
619 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
620         .ctl_compat_table       = sctp_compat_sysctl_table,
621 #endif
622 #endif
623 };
624
625 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 = {
626         .l3proto                = PF_INET6,
627         .l4proto                = IPPROTO_SCTP,
628         .name                   = "sctp",
629         .pkt_to_tuple           = sctp_pkt_to_tuple,
630         .invert_tuple           = sctp_invert_tuple,
631         .print_tuple            = sctp_print_tuple,
632         .print_conntrack        = sctp_print_conntrack,
633         .packet                 = sctp_packet,
634         .new                    = sctp_new,
635         .me                     = THIS_MODULE,
636 #ifdef CONFIG_SYSCTL
637         .ctl_table_users        = &sctp_sysctl_table_users,
638         .ctl_table_header       = &sctp_sysctl_header,
639         .ctl_table              = sctp_sysctl_table,
640 #endif
641 };
642
643 int __init nf_conntrack_proto_sctp_init(void)
644 {
645         int ret;
646
647         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
648         if (ret) {
649                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
650                 goto out;
651         }
652         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
653         if (ret) {
654                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
655                 goto cleanup_sctp4;
656         }
657
658         return ret;
659
660  cleanup_sctp4:
661         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
662  out:
663         return ret;
664 }
665
666 void __exit nf_conntrack_proto_sctp_fini(void)
667 {
668         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
669         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
670 }
671
672 module_init(nf_conntrack_proto_sctp_init);
673 module_exit(nf_conntrack_proto_sctp_fini);
674
675 MODULE_LICENSE("GPL");
676 MODULE_AUTHOR("Kiran Kumar Immidi");
677 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
678 MODULE_ALIAS("ip_conntrack_proto_sctp");