84e37e92b76431d627136035e945166ed8e6dbc8
[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 const u8 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, const struct nf_conn *ct)
177 {
178         enum sctp_conntrack state;
179
180         read_lock_bh(&sctp_lock);
181         state = ct->proto.sctp.state;
182         read_unlock_bh(&sctp_lock);
183
184         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
185 }
186
187 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
188 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0;        \
189         (offset) < (skb)->len &&                                        \
190         ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch)));   \
191         (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
192
193 /* Some validity checks to make sure the chunks are fine */
194 static int do_basic_checks(struct nf_conn *ct,
195                            const struct sk_buff *skb,
196                            unsigned int dataoff,
197                            unsigned long *map)
198 {
199         u_int32_t offset, count;
200         sctp_chunkhdr_t _sch, *sch;
201         int flag;
202
203         flag = 0;
204
205         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
206                 pr_debug("Chunk Num: %d  Type: %d\n", count, sch->type);
207
208                 if (sch->type == SCTP_CID_INIT ||
209                     sch->type == SCTP_CID_INIT_ACK ||
210                     sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
211                         flag = 1;
212
213                 /*
214                  * Cookie Ack/Echo chunks not the first OR
215                  * Init / Init Ack / Shutdown compl chunks not the only chunks
216                  * OR zero-length.
217                  */
218                 if (((sch->type == SCTP_CID_COOKIE_ACK ||
219                       sch->type == SCTP_CID_COOKIE_ECHO ||
220                       flag) &&
221                      count != 0) || !sch->length) {
222                         pr_debug("Basic checks failed\n");
223                         return 1;
224                 }
225
226                 if (map)
227                         set_bit(sch->type, map);
228         }
229
230         pr_debug("Basic checks passed\n");
231         return count == 0;
232 }
233
234 static int new_state(enum ip_conntrack_dir dir,
235                      enum sctp_conntrack cur_state,
236                      int chunk_type)
237 {
238         int i;
239
240         pr_debug("Chunk type: %d\n", chunk_type);
241
242         switch (chunk_type) {
243         case SCTP_CID_INIT:
244                 pr_debug("SCTP_CID_INIT\n");
245                 i = 0;
246                 break;
247         case SCTP_CID_INIT_ACK:
248                 pr_debug("SCTP_CID_INIT_ACK\n");
249                 i = 1;
250                 break;
251         case SCTP_CID_ABORT:
252                 pr_debug("SCTP_CID_ABORT\n");
253                 i = 2;
254                 break;
255         case SCTP_CID_SHUTDOWN:
256                 pr_debug("SCTP_CID_SHUTDOWN\n");
257                 i = 3;
258                 break;
259         case SCTP_CID_SHUTDOWN_ACK:
260                 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
261                 i = 4;
262                 break;
263         case SCTP_CID_ERROR:
264                 pr_debug("SCTP_CID_ERROR\n");
265                 i = 5;
266                 break;
267         case SCTP_CID_COOKIE_ECHO:
268                 pr_debug("SCTP_CID_COOKIE_ECHO\n");
269                 i = 6;
270                 break;
271         case SCTP_CID_COOKIE_ACK:
272                 pr_debug("SCTP_CID_COOKIE_ACK\n");
273                 i = 7;
274                 break;
275         case SCTP_CID_SHUTDOWN_COMPLETE:
276                 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
277                 i = 8;
278                 break;
279         default:
280                 /* Other chunks like DATA, SACK, HEARTBEAT and
281                 its ACK do not cause a change in state */
282                 pr_debug("Unknown chunk type, Will stay in %s\n",
283                          sctp_conntrack_names[cur_state]);
284                 return cur_state;
285         }
286
287         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
288                  dir, sctp_conntrack_names[cur_state], chunk_type,
289                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
290
291         return sctp_conntracks[dir][i][cur_state];
292 }
293
294 /* Returns verdict for packet, or -1 for invalid. */
295 static int sctp_packet(struct nf_conn *ct,
296                        const struct sk_buff *skb,
297                        unsigned int dataoff,
298                        enum ip_conntrack_info ctinfo,
299                        int pf,
300                        unsigned int hooknum)
301 {
302         enum sctp_conntrack newconntrack, oldsctpstate;
303         sctp_sctphdr_t _sctph, *sh;
304         sctp_chunkhdr_t _sch, *sch;
305         u_int32_t offset, count;
306         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
307
308         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
309         if (sh == NULL)
310                 return -1;
311
312         if (do_basic_checks(ct, skb, dataoff, map) != 0)
313                 return -1;
314
315         /* Check the verification tag (Sec 8.5) */
316         if (!test_bit(SCTP_CID_INIT, map) &&
317             !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
318             !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
319             !test_bit(SCTP_CID_ABORT, map) &&
320             !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
321             sh->vtag != ct->proto.sctp.vtag[CTINFO2DIR(ctinfo)]) {
322                 pr_debug("Verification tag check failed\n");
323                 return -1;
324         }
325
326         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
327         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
328                 write_lock_bh(&sctp_lock);
329
330                 /* Special cases of Verification tag check (Sec 8.5.1) */
331                 if (sch->type == SCTP_CID_INIT) {
332                         /* Sec 8.5.1 (A) */
333                         if (sh->vtag != 0) {
334                                 write_unlock_bh(&sctp_lock);
335                                 return -1;
336                         }
337                 } else if (sch->type == SCTP_CID_ABORT) {
338                         /* Sec 8.5.1 (B) */
339                         if (sh->vtag != ct->proto.sctp.vtag[CTINFO2DIR(ctinfo)] &&
340                             sh->vtag != ct->proto.sctp.vtag[1 - CTINFO2DIR(ctinfo)]) {
341                                 write_unlock_bh(&sctp_lock);
342                                 return -1;
343                         }
344                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
345                         /* Sec 8.5.1 (C) */
346                         if (sh->vtag != ct->proto.sctp.vtag[CTINFO2DIR(ctinfo)] &&
347                             sh->vtag != ct->proto.sctp.vtag[1 - CTINFO2DIR(ctinfo)] &&
348                             (sch->flags & 1)) {
349                                 write_unlock_bh(&sctp_lock);
350                                 return -1;
351                         }
352                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
353                         /* Sec 8.5.1 (D) */
354                         if (sh->vtag != ct->proto.sctp.vtag[CTINFO2DIR(ctinfo)]) {
355                                 write_unlock_bh(&sctp_lock);
356                                 return -1;
357                         }
358                 }
359
360                 oldsctpstate = ct->proto.sctp.state;
361                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
362
363                 /* Invalid */
364                 if (newconntrack == SCTP_CONNTRACK_MAX) {
365                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
366                                  "conntrack=%u\n",
367                                  CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
368                         write_unlock_bh(&sctp_lock);
369                         return -1;
370                 }
371
372                 /* If it is an INIT or an INIT ACK note down the vtag */
373                 if (sch->type == SCTP_CID_INIT ||
374                     sch->type == SCTP_CID_INIT_ACK) {
375                         sctp_inithdr_t _inithdr, *ih;
376
377                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
378                                                 sizeof(_inithdr), &_inithdr);
379                         if (ih == NULL) {
380                                 write_unlock_bh(&sctp_lock);
381                                 return -1;
382                         }
383                         pr_debug("Setting vtag %x for dir %d\n",
384                                  ih->init_tag, !CTINFO2DIR(ctinfo));
385                         ct->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
386                 }
387
388                 ct->proto.sctp.state = newconntrack;
389                 if (oldsctpstate != newconntrack)
390                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
391                 write_unlock_bh(&sctp_lock);
392         }
393
394         nf_ct_refresh_acct(ct, ctinfo, skb, *sctp_timeouts[newconntrack]);
395
396         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED &&
397             CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY &&
398             newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
399                 pr_debug("Setting assured bit\n");
400                 set_bit(IPS_ASSURED_BIT, &ct->status);
401                 nf_conntrack_event_cache(IPCT_STATUS, skb);
402         }
403
404         return NF_ACCEPT;
405 }
406
407 /* Called when a new connection for this protocol found. */
408 static int sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
409                     unsigned int dataoff)
410 {
411         enum sctp_conntrack newconntrack;
412         sctp_sctphdr_t _sctph, *sh;
413         sctp_chunkhdr_t _sch, *sch;
414         u_int32_t offset, count;
415         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
416
417         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
418         if (sh == NULL)
419                 return 0;
420
421         if (do_basic_checks(ct, skb, dataoff, map) != 0)
422                 return 0;
423
424         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
425         if (test_bit(SCTP_CID_ABORT, map) ||
426             test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
427             test_bit(SCTP_CID_COOKIE_ACK, map))
428                 return 0;
429
430         newconntrack = SCTP_CONNTRACK_MAX;
431         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
432                 /* Don't need lock here: this conntrack not in circulation yet */
433                 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
434                                          SCTP_CONNTRACK_NONE, sch->type);
435
436                 /* Invalid: delete conntrack */
437                 if (newconntrack == SCTP_CONNTRACK_NONE ||
438                     newconntrack == SCTP_CONNTRACK_MAX) {
439                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
440                         return 0;
441                 }
442
443                 /* Copy the vtag into the state info */
444                 if (sch->type == SCTP_CID_INIT) {
445                         if (sh->vtag == 0) {
446                                 sctp_inithdr_t _inithdr, *ih;
447
448                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
449                                                         sizeof(_inithdr), &_inithdr);
450                                 if (ih == NULL)
451                                         return 0;
452
453                                 pr_debug("Setting vtag %x for new conn\n",
454                                          ih->init_tag);
455
456                                 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
457                                                                 ih->init_tag;
458                         } else {
459                                 /* Sec 8.5.1 (A) */
460                                 return 0;
461                         }
462                 }
463                 /* If it is a shutdown ack OOTB packet, we expect a return
464                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
465                 else {
466                         pr_debug("Setting vtag %x for new conn OOTB\n",
467                                  sh->vtag);
468                         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
469                 }
470
471                 ct->proto.sctp.state = newconntrack;
472         }
473
474         return 1;
475 }
476
477 #ifdef CONFIG_SYSCTL
478 static unsigned int sctp_sysctl_table_users;
479 static struct ctl_table_header *sctp_sysctl_header;
480 static struct ctl_table sctp_sysctl_table[] = {
481         {
482                 .procname       = "nf_conntrack_sctp_timeout_closed",
483                 .data           = &nf_ct_sctp_timeout_closed,
484                 .maxlen         = sizeof(unsigned int),
485                 .mode           = 0644,
486                 .proc_handler   = &proc_dointvec_jiffies,
487         },
488         {
489                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
490                 .data           = &nf_ct_sctp_timeout_cookie_wait,
491                 .maxlen         = sizeof(unsigned int),
492                 .mode           = 0644,
493                 .proc_handler   = &proc_dointvec_jiffies,
494         },
495         {
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                 .procname       = "nf_conntrack_sctp_timeout_established",
504                 .data           = &nf_ct_sctp_timeout_established,
505                 .maxlen         = sizeof(unsigned int),
506                 .mode           = 0644,
507                 .proc_handler   = &proc_dointvec_jiffies,
508         },
509         {
510                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
511                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
512                 .maxlen         = sizeof(unsigned int),
513                 .mode           = 0644,
514                 .proc_handler   = &proc_dointvec_jiffies,
515         },
516         {
517                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
518                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
519                 .maxlen         = sizeof(unsigned int),
520                 .mode           = 0644,
521                 .proc_handler   = &proc_dointvec_jiffies,
522         },
523         {
524                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
525                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
526                 .maxlen         = sizeof(unsigned int),
527                 .mode           = 0644,
528                 .proc_handler   = &proc_dointvec_jiffies,
529         },
530         {
531                 .ctl_name = 0
532         }
533 };
534
535 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
536 static struct ctl_table sctp_compat_sysctl_table[] = {
537         {
538                 .procname       = "ip_conntrack_sctp_timeout_closed",
539                 .data           = &nf_ct_sctp_timeout_closed,
540                 .maxlen         = sizeof(unsigned int),
541                 .mode           = 0644,
542                 .proc_handler   = &proc_dointvec_jiffies,
543         },
544         {
545                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
546                 .data           = &nf_ct_sctp_timeout_cookie_wait,
547                 .maxlen         = sizeof(unsigned int),
548                 .mode           = 0644,
549                 .proc_handler   = &proc_dointvec_jiffies,
550         },
551         {
552                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
553                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
554                 .maxlen         = sizeof(unsigned int),
555                 .mode           = 0644,
556                 .proc_handler   = &proc_dointvec_jiffies,
557         },
558         {
559                 .procname       = "ip_conntrack_sctp_timeout_established",
560                 .data           = &nf_ct_sctp_timeout_established,
561                 .maxlen         = sizeof(unsigned int),
562                 .mode           = 0644,
563                 .proc_handler   = &proc_dointvec_jiffies,
564         },
565         {
566                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
567                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
568                 .maxlen         = sizeof(unsigned int),
569                 .mode           = 0644,
570                 .proc_handler   = &proc_dointvec_jiffies,
571         },
572         {
573                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
574                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
575                 .maxlen         = sizeof(unsigned int),
576                 .mode           = 0644,
577                 .proc_handler   = &proc_dointvec_jiffies,
578         },
579         {
580                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
581                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
582                 .maxlen         = sizeof(unsigned int),
583                 .mode           = 0644,
584                 .proc_handler   = &proc_dointvec_jiffies,
585         },
586         {
587                 .ctl_name = 0
588         }
589 };
590 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
591 #endif
592
593 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
594         .l3proto                = PF_INET,
595         .l4proto                = IPPROTO_SCTP,
596         .name                   = "sctp",
597         .pkt_to_tuple           = sctp_pkt_to_tuple,
598         .invert_tuple           = sctp_invert_tuple,
599         .print_tuple            = sctp_print_tuple,
600         .print_conntrack        = sctp_print_conntrack,
601         .packet                 = sctp_packet,
602         .new                    = sctp_new,
603         .me                     = THIS_MODULE,
604 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
605         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
606         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
607         .nla_policy             = nf_ct_port_nla_policy,
608 #endif
609 #ifdef CONFIG_SYSCTL
610         .ctl_table_users        = &sctp_sysctl_table_users,
611         .ctl_table_header       = &sctp_sysctl_header,
612         .ctl_table              = sctp_sysctl_table,
613 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
614         .ctl_compat_table       = sctp_compat_sysctl_table,
615 #endif
616 #endif
617 };
618
619 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
620         .l3proto                = PF_INET6,
621         .l4proto                = IPPROTO_SCTP,
622         .name                   = "sctp",
623         .pkt_to_tuple           = sctp_pkt_to_tuple,
624         .invert_tuple           = sctp_invert_tuple,
625         .print_tuple            = sctp_print_tuple,
626         .print_conntrack        = sctp_print_conntrack,
627         .packet                 = sctp_packet,
628         .new                    = sctp_new,
629         .me                     = THIS_MODULE,
630 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
631         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
632         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
633         .nla_policy             = nf_ct_port_nla_policy,
634 #endif
635 #ifdef CONFIG_SYSCTL
636         .ctl_table_users        = &sctp_sysctl_table_users,
637         .ctl_table_header       = &sctp_sysctl_header,
638         .ctl_table              = sctp_sysctl_table,
639 #endif
640 };
641
642 int __init nf_conntrack_proto_sctp_init(void)
643 {
644         int ret;
645
646         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
647         if (ret) {
648                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
649                 goto out;
650         }
651         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
652         if (ret) {
653                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
654                 goto cleanup_sctp4;
655         }
656
657         return ret;
658
659  cleanup_sctp4:
660         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
661  out:
662         return ret;
663 }
664
665 void __exit nf_conntrack_proto_sctp_fini(void)
666 {
667         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
668         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
669 }
670
671 module_init(nf_conntrack_proto_sctp_init);
672 module_exit(nf_conntrack_proto_sctp_fini);
673
674 MODULE_LICENSE("GPL");
675 MODULE_AUTHOR("Kiran Kumar Immidi");
676 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
677 MODULE_ALIAS("ip_conntrack_proto_sctp");