[NETFILTER]: nf_conntrack_sctp: use proper types for bitops
[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,
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                            unsigned long *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                  * Cookie Ack/Echo chunks not the first OR
216                  * Init / Init Ack / Shutdown compl chunks not the only chunks
217                  * OR zero-length.
218                  */
219                 if (((sch->type == SCTP_CID_COOKIE_ACK ||
220                       sch->type == SCTP_CID_COOKIE_ECHO ||
221                       flag) &&
222                      count != 0) || !sch->length) {
223                         pr_debug("Basic checks failed\n");
224                         return 1;
225                 }
226
227                 if (map)
228                         set_bit(sch->type, map);
229         }
230
231         pr_debug("Basic checks passed\n");
232         return count == 0;
233 }
234
235 static int new_state(enum ip_conntrack_dir dir,
236                      enum sctp_conntrack cur_state,
237                      int chunk_type)
238 {
239         int i;
240
241         pr_debug("Chunk type: %d\n", chunk_type);
242
243         switch (chunk_type) {
244         case SCTP_CID_INIT:
245                 pr_debug("SCTP_CID_INIT\n");
246                 i = 0;
247                 break;
248         case SCTP_CID_INIT_ACK:
249                 pr_debug("SCTP_CID_INIT_ACK\n");
250                 i = 1;
251                 break;
252         case SCTP_CID_ABORT:
253                 pr_debug("SCTP_CID_ABORT\n");
254                 i = 2;
255                 break;
256         case SCTP_CID_SHUTDOWN:
257                 pr_debug("SCTP_CID_SHUTDOWN\n");
258                 i = 3;
259                 break;
260         case SCTP_CID_SHUTDOWN_ACK:
261                 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
262                 i = 4;
263                 break;
264         case SCTP_CID_ERROR:
265                 pr_debug("SCTP_CID_ERROR\n");
266                 i = 5;
267                 break;
268         case SCTP_CID_COOKIE_ECHO:
269                 pr_debug("SCTP_CID_COOKIE_ECHO\n");
270                 i = 6;
271                 break;
272         case SCTP_CID_COOKIE_ACK:
273                 pr_debug("SCTP_CID_COOKIE_ACK\n");
274                 i = 7;
275                 break;
276         case SCTP_CID_SHUTDOWN_COMPLETE:
277                 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
278                 i = 8;
279                 break;
280         default:
281                 /* Other chunks like DATA, SACK, HEARTBEAT and
282                 its ACK do not cause a change in state */
283                 pr_debug("Unknown chunk type, Will stay in %s\n",
284                          sctp_conntrack_names[cur_state]);
285                 return cur_state;
286         }
287
288         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
289                  dir, sctp_conntrack_names[cur_state], chunk_type,
290                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
291
292         return sctp_conntracks[dir][i][cur_state];
293 }
294
295 /* Returns verdict for packet, or -1 for invalid. */
296 static int sctp_packet(struct nf_conn *conntrack,
297                        const struct sk_buff *skb,
298                        unsigned int dataoff,
299                        enum ip_conntrack_info ctinfo,
300                        int pf,
301                        unsigned int hooknum)
302 {
303         enum sctp_conntrack newconntrack, oldsctpstate;
304         sctp_sctphdr_t _sctph, *sh;
305         sctp_chunkhdr_t _sch, *sch;
306         u_int32_t offset, count;
307         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
308
309         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
310         if (sh == NULL)
311                 return -1;
312
313         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
314                 return -1;
315
316         /* Check the verification tag (Sec 8.5) */
317         if (!test_bit(SCTP_CID_INIT, map) &&
318             !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
319             !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
320             !test_bit(SCTP_CID_ABORT, map) &&
321             !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
322             sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)]) {
323                 pr_debug("Verification tag check failed\n");
324                 return -1;
325         }
326
327         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
328         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
329                 write_lock_bh(&sctp_lock);
330
331                 /* Special cases of Verification tag check (Sec 8.5.1) */
332                 if (sch->type == SCTP_CID_INIT) {
333                         /* Sec 8.5.1 (A) */
334                         if (sh->vtag != 0) {
335                                 write_unlock_bh(&sctp_lock);
336                                 return -1;
337                         }
338                 } else if (sch->type == SCTP_CID_ABORT) {
339                         /* Sec 8.5.1 (B) */
340                         if (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)] &&
341                             sh->vtag != conntrack->proto.sctp.vtag[1 - CTINFO2DIR(ctinfo)]) {
342                                 write_unlock_bh(&sctp_lock);
343                                 return -1;
344                         }
345                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
346                         /* Sec 8.5.1 (C) */
347                         if (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)] &&
348                             sh->vtag != conntrack->proto.sctp.vtag[1 - CTINFO2DIR(ctinfo)] &&
349                             (sch->flags & 1)) {
350                                 write_unlock_bh(&sctp_lock);
351                                 return -1;
352                         }
353                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
354                         /* Sec 8.5.1 (D) */
355                         if (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)]) {
356                                 write_unlock_bh(&sctp_lock);
357                                 return -1;
358                         }
359                 }
360
361                 oldsctpstate = conntrack->proto.sctp.state;
362                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
363
364                 /* Invalid */
365                 if (newconntrack == SCTP_CONNTRACK_MAX) {
366                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
367                                  "conntrack=%u\n",
368                                  CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
369                         write_unlock_bh(&sctp_lock);
370                         return -1;
371                 }
372
373                 /* If it is an INIT or an INIT ACK note down the vtag */
374                 if (sch->type == SCTP_CID_INIT ||
375                     sch->type == SCTP_CID_INIT_ACK) {
376                         sctp_inithdr_t _inithdr, *ih;
377
378                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
379                                                 sizeof(_inithdr), &_inithdr);
380                         if (ih == NULL) {
381                                 write_unlock_bh(&sctp_lock);
382                                 return -1;
383                         }
384                         pr_debug("Setting vtag %x for dir %d\n",
385                                  ih->init_tag, !CTINFO2DIR(ctinfo));
386                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
387                 }
388
389                 conntrack->proto.sctp.state = newconntrack;
390                 if (oldsctpstate != newconntrack)
391                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
392                 write_unlock_bh(&sctp_lock);
393         }
394
395         nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
396
397         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED &&
398             CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY &&
399             newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
400                 pr_debug("Setting assured bit\n");
401                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
402                 nf_conntrack_event_cache(IPCT_STATUS, skb);
403         }
404
405         return NF_ACCEPT;
406 }
407
408 /* Called when a new connection for this protocol found. */
409 static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
410                     unsigned int dataoff)
411 {
412         enum sctp_conntrack newconntrack;
413         sctp_sctphdr_t _sctph, *sh;
414         sctp_chunkhdr_t _sch, *sch;
415         u_int32_t offset, count;
416         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
417
418         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
419         if (sh == NULL)
420                 return 0;
421
422         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
423                 return 0;
424
425         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
426         if (test_bit(SCTP_CID_ABORT, map) ||
427             test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
428             test_bit(SCTP_CID_COOKIE_ACK, map))
429                 return 0;
430
431         newconntrack = SCTP_CONNTRACK_MAX;
432         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
433                 /* Don't need lock here: this conntrack not in circulation yet */
434                 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
435                                          SCTP_CONNTRACK_NONE, sch->type);
436
437                 /* Invalid: delete conntrack */
438                 if (newconntrack == SCTP_CONNTRACK_NONE ||
439                     newconntrack == SCTP_CONNTRACK_MAX) {
440                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
441                         return 0;
442                 }
443
444                 /* Copy the vtag into the state info */
445                 if (sch->type == SCTP_CID_INIT) {
446                         if (sh->vtag == 0) {
447                                 sctp_inithdr_t _inithdr, *ih;
448
449                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
450                                                         sizeof(_inithdr), &_inithdr);
451                                 if (ih == NULL)
452                                         return 0;
453
454                                 pr_debug("Setting vtag %x for new conn\n",
455                                          ih->init_tag);
456
457                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
458                                                                 ih->init_tag;
459                         } else {
460                                 /* Sec 8.5.1 (A) */
461                                 return 0;
462                         }
463                 }
464                 /* If it is a shutdown ack OOTB packet, we expect a return
465                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
466                 else {
467                         pr_debug("Setting vtag %x for new conn OOTB\n",
468                                  sh->vtag);
469                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
470                 }
471
472                 conntrack->proto.sctp.state = newconntrack;
473         }
474
475         return 1;
476 }
477
478 #ifdef CONFIG_SYSCTL
479 static unsigned int sctp_sysctl_table_users;
480 static struct ctl_table_header *sctp_sysctl_header;
481 static struct ctl_table sctp_sysctl_table[] = {
482         {
483                 .procname       = "nf_conntrack_sctp_timeout_closed",
484                 .data           = &nf_ct_sctp_timeout_closed,
485                 .maxlen         = sizeof(unsigned int),
486                 .mode           = 0644,
487                 .proc_handler   = &proc_dointvec_jiffies,
488         },
489         {
490                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
491                 .data           = &nf_ct_sctp_timeout_cookie_wait,
492                 .maxlen         = sizeof(unsigned int),
493                 .mode           = 0644,
494                 .proc_handler   = &proc_dointvec_jiffies,
495         },
496         {
497                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
498                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
499                 .maxlen         = sizeof(unsigned int),
500                 .mode           = 0644,
501                 .proc_handler   = &proc_dointvec_jiffies,
502         },
503         {
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                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
512                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
513                 .maxlen         = sizeof(unsigned int),
514                 .mode           = 0644,
515                 .proc_handler   = &proc_dointvec_jiffies,
516         },
517         {
518                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
519                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
520                 .maxlen         = sizeof(unsigned int),
521                 .mode           = 0644,
522                 .proc_handler   = &proc_dointvec_jiffies,
523         },
524         {
525                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
526                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
527                 .maxlen         = sizeof(unsigned int),
528                 .mode           = 0644,
529                 .proc_handler   = &proc_dointvec_jiffies,
530         },
531         {
532                 .ctl_name = 0
533         }
534 };
535
536 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
537 static struct ctl_table sctp_compat_sysctl_table[] = {
538         {
539                 .procname       = "ip_conntrack_sctp_timeout_closed",
540                 .data           = &nf_ct_sctp_timeout_closed,
541                 .maxlen         = sizeof(unsigned int),
542                 .mode           = 0644,
543                 .proc_handler   = &proc_dointvec_jiffies,
544         },
545         {
546                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
547                 .data           = &nf_ct_sctp_timeout_cookie_wait,
548                 .maxlen         = sizeof(unsigned int),
549                 .mode           = 0644,
550                 .proc_handler   = &proc_dointvec_jiffies,
551         },
552         {
553                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
554                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
555                 .maxlen         = sizeof(unsigned int),
556                 .mode           = 0644,
557                 .proc_handler   = &proc_dointvec_jiffies,
558         },
559         {
560                 .procname       = "ip_conntrack_sctp_timeout_established",
561                 .data           = &nf_ct_sctp_timeout_established,
562                 .maxlen         = sizeof(unsigned int),
563                 .mode           = 0644,
564                 .proc_handler   = &proc_dointvec_jiffies,
565         },
566         {
567                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
568                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
569                 .maxlen         = sizeof(unsigned int),
570                 .mode           = 0644,
571                 .proc_handler   = &proc_dointvec_jiffies,
572         },
573         {
574                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
575                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
576                 .maxlen         = sizeof(unsigned int),
577                 .mode           = 0644,
578                 .proc_handler   = &proc_dointvec_jiffies,
579         },
580         {
581                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
582                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
583                 .maxlen         = sizeof(unsigned int),
584                 .mode           = 0644,
585                 .proc_handler   = &proc_dointvec_jiffies,
586         },
587         {
588                 .ctl_name = 0
589         }
590 };
591 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
592 #endif
593
594 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
595         .l3proto                = PF_INET,
596         .l4proto                = IPPROTO_SCTP,
597         .name                   = "sctp",
598         .pkt_to_tuple           = sctp_pkt_to_tuple,
599         .invert_tuple           = sctp_invert_tuple,
600         .print_tuple            = sctp_print_tuple,
601         .print_conntrack        = sctp_print_conntrack,
602         .packet                 = sctp_packet,
603         .new                    = sctp_new,
604         .me                     = THIS_MODULE,
605 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
606         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
607         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
608         .nla_policy             = nf_ct_port_nla_policy,
609 #endif
610 #ifdef CONFIG_SYSCTL
611         .ctl_table_users        = &sctp_sysctl_table_users,
612         .ctl_table_header       = &sctp_sysctl_header,
613         .ctl_table              = sctp_sysctl_table,
614 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
615         .ctl_compat_table       = sctp_compat_sysctl_table,
616 #endif
617 #endif
618 };
619
620 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
621         .l3proto                = PF_INET6,
622         .l4proto                = IPPROTO_SCTP,
623         .name                   = "sctp",
624         .pkt_to_tuple           = sctp_pkt_to_tuple,
625         .invert_tuple           = sctp_invert_tuple,
626         .print_tuple            = sctp_print_tuple,
627         .print_conntrack        = sctp_print_conntrack,
628         .packet                 = sctp_packet,
629         .new                    = sctp_new,
630         .me                     = THIS_MODULE,
631 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
632         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
633         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
634         .nla_policy             = nf_ct_port_nla_policy,
635 #endif
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");