[NETFILTER]: nf_conntrack: naming unification
[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 ct->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 sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = {
53         [SCTP_CONNTRACK_CLOSED]                 = 10 SECS,
54         [SCTP_CONNTRACK_COOKIE_WAIT]            = 3 SECS,
55         [SCTP_CONNTRACK_COOKIE_ECHOED]          = 3 SECS,
56         [SCTP_CONNTRACK_ESTABLISHED]            = 5 DAYS,
57         [SCTP_CONNTRACK_SHUTDOWN_SENT]          = 300 SECS / 1000,
58         [SCTP_CONNTRACK_SHUTDOWN_RECD]          = 300 SECS / 1000,
59         [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]      = 3 SECS,
60 };
61
62 #define sNO SCTP_CONNTRACK_NONE
63 #define sCL SCTP_CONNTRACK_CLOSED
64 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
65 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
66 #define sES SCTP_CONNTRACK_ESTABLISHED
67 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
68 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
69 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
70 #define sIV SCTP_CONNTRACK_MAX
71
72 /*
73         These are the descriptions of the states:
74
75 NOTE: These state names are tantalizingly similar to the states of an
76 SCTP endpoint. But the interpretation of the states is a little different,
77 considering that these are the states of the connection and not of an end
78 point. Please note the subtleties. -Kiran
79
80 NONE              - Nothing so far.
81 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
82                     an INIT_ACK chunk in the reply direction.
83 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
84 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
85 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
86 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
87 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
88                     to that of the SHUTDOWN chunk.
89 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
90                     the SHUTDOWN chunk. Connection is closed.
91 */
92
93 /* TODO
94  - I have assumed that the first INIT is in the original direction.
95  This messes things when an INIT comes in the reply direction in CLOSED
96  state.
97  - Check the error type in the reply dir before transitioning from
98 cookie echoed to closed.
99  - Sec 5.2.4 of RFC 2960
100  - Multi Homing support.
101 */
102
103 /* SCTP conntrack state transitions */
104 static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
105         {
106 /*      ORIGINAL        */
107 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
108 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
109 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
110 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
111 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
112 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
113 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
114 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
115 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
116 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
117         },
118         {
119 /*      REPLY   */
120 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
121 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
122 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
123 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
124 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
125 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
126 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
127 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
128 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
129 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
130         }
131 };
132
133 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
134                              unsigned int dataoff,
135                              struct nf_conntrack_tuple *tuple)
136 {
137         sctp_sctphdr_t _hdr, *hp;
138
139         /* Actually only need first 8 bytes. */
140         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
141         if (hp == NULL)
142                 return 0;
143
144         tuple->src.u.sctp.port = hp->source;
145         tuple->dst.u.sctp.port = hp->dest;
146         return 1;
147 }
148
149 static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
150                              const struct nf_conntrack_tuple *orig)
151 {
152         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
153         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
154         return 1;
155 }
156
157 /* Print out the per-protocol part of the tuple. */
158 static int sctp_print_tuple(struct seq_file *s,
159                             const struct nf_conntrack_tuple *tuple)
160 {
161         return seq_printf(s, "sport=%hu dport=%hu ",
162                           ntohs(tuple->src.u.sctp.port),
163                           ntohs(tuple->dst.u.sctp.port));
164 }
165
166 /* Print out the private part of the conntrack. */
167 static int sctp_print_conntrack(struct seq_file *s, const struct nf_conn *ct)
168 {
169         enum sctp_conntrack state;
170
171         read_lock_bh(&sctp_lock);
172         state = ct->proto.sctp.state;
173         read_unlock_bh(&sctp_lock);
174
175         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
176 }
177
178 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
179 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0;        \
180         (offset) < (skb)->len &&                                        \
181         ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch)));   \
182         (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
183
184 /* Some validity checks to make sure the chunks are fine */
185 static int do_basic_checks(struct nf_conn *ct,
186                            const struct sk_buff *skb,
187                            unsigned int dataoff,
188                            unsigned long *map)
189 {
190         u_int32_t offset, count;
191         sctp_chunkhdr_t _sch, *sch;
192         int flag;
193
194         flag = 0;
195
196         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
197                 pr_debug("Chunk Num: %d  Type: %d\n", count, sch->type);
198
199                 if (sch->type == SCTP_CID_INIT ||
200                     sch->type == SCTP_CID_INIT_ACK ||
201                     sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
202                         flag = 1;
203
204                 /*
205                  * Cookie Ack/Echo chunks not the first OR
206                  * Init / Init Ack / Shutdown compl chunks not the only chunks
207                  * OR zero-length.
208                  */
209                 if (((sch->type == SCTP_CID_COOKIE_ACK ||
210                       sch->type == SCTP_CID_COOKIE_ECHO ||
211                       flag) &&
212                      count != 0) || !sch->length) {
213                         pr_debug("Basic checks failed\n");
214                         return 1;
215                 }
216
217                 if (map)
218                         set_bit(sch->type, map);
219         }
220
221         pr_debug("Basic checks passed\n");
222         return count == 0;
223 }
224
225 static int sctp_new_state(enum ip_conntrack_dir dir,
226                           enum sctp_conntrack cur_state,
227                           int chunk_type)
228 {
229         int i;
230
231         pr_debug("Chunk type: %d\n", chunk_type);
232
233         switch (chunk_type) {
234         case SCTP_CID_INIT:
235                 pr_debug("SCTP_CID_INIT\n");
236                 i = 0;
237                 break;
238         case SCTP_CID_INIT_ACK:
239                 pr_debug("SCTP_CID_INIT_ACK\n");
240                 i = 1;
241                 break;
242         case SCTP_CID_ABORT:
243                 pr_debug("SCTP_CID_ABORT\n");
244                 i = 2;
245                 break;
246         case SCTP_CID_SHUTDOWN:
247                 pr_debug("SCTP_CID_SHUTDOWN\n");
248                 i = 3;
249                 break;
250         case SCTP_CID_SHUTDOWN_ACK:
251                 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
252                 i = 4;
253                 break;
254         case SCTP_CID_ERROR:
255                 pr_debug("SCTP_CID_ERROR\n");
256                 i = 5;
257                 break;
258         case SCTP_CID_COOKIE_ECHO:
259                 pr_debug("SCTP_CID_COOKIE_ECHO\n");
260                 i = 6;
261                 break;
262         case SCTP_CID_COOKIE_ACK:
263                 pr_debug("SCTP_CID_COOKIE_ACK\n");
264                 i = 7;
265                 break;
266         case SCTP_CID_SHUTDOWN_COMPLETE:
267                 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
268                 i = 8;
269                 break;
270         default:
271                 /* Other chunks like DATA, SACK, HEARTBEAT and
272                 its ACK do not cause a change in state */
273                 pr_debug("Unknown chunk type, Will stay in %s\n",
274                          sctp_conntrack_names[cur_state]);
275                 return cur_state;
276         }
277
278         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
279                  dir, sctp_conntrack_names[cur_state], chunk_type,
280                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
281
282         return sctp_conntracks[dir][i][cur_state];
283 }
284
285 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
286 static int sctp_packet(struct nf_conn *ct,
287                        const struct sk_buff *skb,
288                        unsigned int dataoff,
289                        enum ip_conntrack_info ctinfo,
290                        int pf,
291                        unsigned int hooknum)
292 {
293         enum sctp_conntrack new_state, old_state;
294         enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
295         sctp_sctphdr_t _sctph, *sh;
296         sctp_chunkhdr_t _sch, *sch;
297         u_int32_t offset, count;
298         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
299
300         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
301         if (sh == NULL)
302                 goto out;
303
304         if (do_basic_checks(ct, skb, dataoff, map) != 0)
305                 goto out;
306
307         /* Check the verification tag (Sec 8.5) */
308         if (!test_bit(SCTP_CID_INIT, map) &&
309             !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
310             !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
311             !test_bit(SCTP_CID_ABORT, map) &&
312             !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
313             sh->vtag != ct->proto.sctp.vtag[dir]) {
314                 pr_debug("Verification tag check failed\n");
315                 goto out;
316         }
317
318         old_state = new_state = SCTP_CONNTRACK_MAX;
319         write_lock_bh(&sctp_lock);
320         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
321                 /* Special cases of Verification tag check (Sec 8.5.1) */
322                 if (sch->type == SCTP_CID_INIT) {
323                         /* Sec 8.5.1 (A) */
324                         if (sh->vtag != 0)
325                                 goto out_unlock;
326                 } else if (sch->type == SCTP_CID_ABORT) {
327                         /* Sec 8.5.1 (B) */
328                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
329                             sh->vtag != ct->proto.sctp.vtag[!dir])
330                                 goto out_unlock;
331                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
332                         /* Sec 8.5.1 (C) */
333                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
334                             sh->vtag != ct->proto.sctp.vtag[!dir] &&
335                             sch->flags & SCTP_CHUNK_FLAG_T)
336                                 goto out_unlock;
337                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
338                         /* Sec 8.5.1 (D) */
339                         if (sh->vtag != ct->proto.sctp.vtag[dir])
340                                 goto out_unlock;
341                 }
342
343                 old_state = ct->proto.sctp.state;
344                 new_state = sctp_new_state(dir, old_state, sch->type);
345
346                 /* Invalid */
347                 if (new_state == SCTP_CONNTRACK_MAX) {
348                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
349                                  "conntrack=%u\n",
350                                  dir, sch->type, old_state);
351                         goto out_unlock;
352                 }
353
354                 /* If it is an INIT or an INIT ACK note down the vtag */
355                 if (sch->type == SCTP_CID_INIT ||
356                     sch->type == SCTP_CID_INIT_ACK) {
357                         sctp_inithdr_t _inithdr, *ih;
358
359                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
360                                                 sizeof(_inithdr), &_inithdr);
361                         if (ih == NULL)
362                                 goto out_unlock;
363                         pr_debug("Setting vtag %x for dir %d\n",
364                                  ih->init_tag, !dir);
365                         ct->proto.sctp.vtag[!dir] = ih->init_tag;
366                 }
367
368                 ct->proto.sctp.state = new_state;
369                 if (old_state != new_state)
370                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
371         }
372         write_unlock_bh(&sctp_lock);
373
374         nf_ct_refresh_acct(ct, ctinfo, skb, sctp_timeouts[new_state]);
375
376         if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
377             dir == IP_CT_DIR_REPLY &&
378             new_state == SCTP_CONNTRACK_ESTABLISHED) {
379                 pr_debug("Setting assured bit\n");
380                 set_bit(IPS_ASSURED_BIT, &ct->status);
381                 nf_conntrack_event_cache(IPCT_STATUS, skb);
382         }
383
384         return NF_ACCEPT;
385
386 out_unlock:
387         write_unlock_bh(&sctp_lock);
388 out:
389         return -NF_ACCEPT;
390 }
391
392 /* Called when a new connection for this protocol found. */
393 static int sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
394                     unsigned int dataoff)
395 {
396         enum sctp_conntrack new_state;
397         sctp_sctphdr_t _sctph, *sh;
398         sctp_chunkhdr_t _sch, *sch;
399         u_int32_t offset, count;
400         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
401
402         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
403         if (sh == NULL)
404                 return 0;
405
406         if (do_basic_checks(ct, skb, dataoff, map) != 0)
407                 return 0;
408
409         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
410         if (test_bit(SCTP_CID_ABORT, map) ||
411             test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
412             test_bit(SCTP_CID_COOKIE_ACK, map))
413                 return 0;
414
415         new_state = SCTP_CONNTRACK_MAX;
416         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
417                 /* Don't need lock here: this conntrack not in circulation yet */
418                 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
419                                            SCTP_CONNTRACK_NONE, sch->type);
420
421                 /* Invalid: delete conntrack */
422                 if (new_state == SCTP_CONNTRACK_NONE ||
423                     new_state == SCTP_CONNTRACK_MAX) {
424                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
425                         return 0;
426                 }
427
428                 /* Copy the vtag into the state info */
429                 if (sch->type == SCTP_CID_INIT) {
430                         if (sh->vtag == 0) {
431                                 sctp_inithdr_t _inithdr, *ih;
432
433                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
434                                                         sizeof(_inithdr), &_inithdr);
435                                 if (ih == NULL)
436                                         return 0;
437
438                                 pr_debug("Setting vtag %x for new conn\n",
439                                          ih->init_tag);
440
441                                 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
442                                                                 ih->init_tag;
443                         } else {
444                                 /* Sec 8.5.1 (A) */
445                                 return 0;
446                         }
447                 }
448                 /* If it is a shutdown ack OOTB packet, we expect a return
449                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
450                 else {
451                         pr_debug("Setting vtag %x for new conn OOTB\n",
452                                  sh->vtag);
453                         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
454                 }
455
456                 ct->proto.sctp.state = new_state;
457         }
458
459         return 1;
460 }
461
462 #ifdef CONFIG_SYSCTL
463 static unsigned int sctp_sysctl_table_users;
464 static struct ctl_table_header *sctp_sysctl_header;
465 static struct ctl_table sctp_sysctl_table[] = {
466         {
467                 .procname       = "nf_conntrack_sctp_timeout_closed",
468                 .data           = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
469                 .maxlen         = sizeof(unsigned int),
470                 .mode           = 0644,
471                 .proc_handler   = &proc_dointvec_jiffies,
472         },
473         {
474                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
475                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
476                 .maxlen         = sizeof(unsigned int),
477                 .mode           = 0644,
478                 .proc_handler   = &proc_dointvec_jiffies,
479         },
480         {
481                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
482                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
483                 .maxlen         = sizeof(unsigned int),
484                 .mode           = 0644,
485                 .proc_handler   = &proc_dointvec_jiffies,
486         },
487         {
488                 .procname       = "nf_conntrack_sctp_timeout_established",
489                 .data           = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
490                 .maxlen         = sizeof(unsigned int),
491                 .mode           = 0644,
492                 .proc_handler   = &proc_dointvec_jiffies,
493         },
494         {
495                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
496                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
497                 .maxlen         = sizeof(unsigned int),
498                 .mode           = 0644,
499                 .proc_handler   = &proc_dointvec_jiffies,
500         },
501         {
502                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
503                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
504                 .maxlen         = sizeof(unsigned int),
505                 .mode           = 0644,
506                 .proc_handler   = &proc_dointvec_jiffies,
507         },
508         {
509                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
510                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
511                 .maxlen         = sizeof(unsigned int),
512                 .mode           = 0644,
513                 .proc_handler   = &proc_dointvec_jiffies,
514         },
515         {
516                 .ctl_name = 0
517         }
518 };
519
520 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
521 static struct ctl_table sctp_compat_sysctl_table[] = {
522         {
523                 .procname       = "ip_conntrack_sctp_timeout_closed",
524                 .data           = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
525                 .maxlen         = sizeof(unsigned int),
526                 .mode           = 0644,
527                 .proc_handler   = &proc_dointvec_jiffies,
528         },
529         {
530                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
531                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
532                 .maxlen         = sizeof(unsigned int),
533                 .mode           = 0644,
534                 .proc_handler   = &proc_dointvec_jiffies,
535         },
536         {
537                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
538                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
539                 .maxlen         = sizeof(unsigned int),
540                 .mode           = 0644,
541                 .proc_handler   = &proc_dointvec_jiffies,
542         },
543         {
544                 .procname       = "ip_conntrack_sctp_timeout_established",
545                 .data           = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
546                 .maxlen         = sizeof(unsigned int),
547                 .mode           = 0644,
548                 .proc_handler   = &proc_dointvec_jiffies,
549         },
550         {
551                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
552                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
553                 .maxlen         = sizeof(unsigned int),
554                 .mode           = 0644,
555                 .proc_handler   = &proc_dointvec_jiffies,
556         },
557         {
558                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
559                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
560                 .maxlen         = sizeof(unsigned int),
561                 .mode           = 0644,
562                 .proc_handler   = &proc_dointvec_jiffies,
563         },
564         {
565                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
566                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
567                 .maxlen         = sizeof(unsigned int),
568                 .mode           = 0644,
569                 .proc_handler   = &proc_dointvec_jiffies,
570         },
571         {
572                 .ctl_name = 0
573         }
574 };
575 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
576 #endif
577
578 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
579         .l3proto                = PF_INET,
580         .l4proto                = IPPROTO_SCTP,
581         .name                   = "sctp",
582         .pkt_to_tuple           = sctp_pkt_to_tuple,
583         .invert_tuple           = sctp_invert_tuple,
584         .print_tuple            = sctp_print_tuple,
585         .print_conntrack        = sctp_print_conntrack,
586         .packet                 = sctp_packet,
587         .new                    = sctp_new,
588         .me                     = THIS_MODULE,
589 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
590         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
591         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
592         .nla_policy             = nf_ct_port_nla_policy,
593 #endif
594 #ifdef CONFIG_SYSCTL
595         .ctl_table_users        = &sctp_sysctl_table_users,
596         .ctl_table_header       = &sctp_sysctl_header,
597         .ctl_table              = sctp_sysctl_table,
598 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
599         .ctl_compat_table       = sctp_compat_sysctl_table,
600 #endif
601 #endif
602 };
603
604 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
605         .l3proto                = PF_INET6,
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 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
616         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
617         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
618         .nla_policy             = nf_ct_port_nla_policy,
619 #endif
620 #ifdef CONFIG_SYSCTL
621         .ctl_table_users        = &sctp_sysctl_table_users,
622         .ctl_table_header       = &sctp_sysctl_header,
623         .ctl_table              = sctp_sysctl_table,
624 #endif
625 };
626
627 static int __init nf_conntrack_proto_sctp_init(void)
628 {
629         int ret;
630
631         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
632         if (ret) {
633                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
634                 goto out;
635         }
636         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
637         if (ret) {
638                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
639                 goto cleanup_sctp4;
640         }
641
642         return ret;
643
644  cleanup_sctp4:
645         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
646  out:
647         return ret;
648 }
649
650 static void __exit nf_conntrack_proto_sctp_fini(void)
651 {
652         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
653         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
654 }
655
656 module_init(nf_conntrack_proto_sctp_init);
657 module_exit(nf_conntrack_proto_sctp_fini);
658
659 MODULE_LICENSE("GPL");
660 MODULE_AUTHOR("Kiran Kumar Immidi");
661 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
662 MODULE_ALIAS("ip_conntrack_proto_sctp");