[NETFILTER]: nf_conntrack: endian annotations
[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  * 17 Oct 2004: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
12  *      - enable working with L3 protocol independent connection tracking.
13  *
14  * Derived from net/ipv4/ip_conntrack_sctp.c
15  */
16
17 /*
18  * Added support for proc manipulation of timeouts.
19  */
20
21 #include <linux/types.h>
22 #include <linux/sched.h>
23 #include <linux/timer.h>
24 #include <linux/netfilter.h>
25 #include <linux/module.h>
26 #include <linux/in.h>
27 #include <linux/ip.h>
28 #include <linux/sctp.h>
29 #include <linux/string.h>
30 #include <linux/seq_file.h>
31 #include <linux/spinlock.h>
32 #include <linux/interrupt.h>
33
34 #include <net/netfilter/nf_conntrack.h>
35 #include <net/netfilter/nf_conntrack_l4proto.h>
36 #include <net/netfilter/nf_conntrack_ecache.h>
37
38 #if 0
39 #define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
40 #else
41 #define DEBUGP(format, args...)
42 #endif
43
44 /* Protects conntrack->proto.sctp */
45 static DEFINE_RWLOCK(sctp_lock);
46
47 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
48    closely.  They're more complex. --RR 
49
50    And so for me for SCTP :D -Kiran */
51
52 static const char *sctp_conntrack_names[] = {
53         "NONE",
54         "CLOSED",
55         "COOKIE_WAIT",
56         "COOKIE_ECHOED",
57         "ESTABLISHED",
58         "SHUTDOWN_SENT",
59         "SHUTDOWN_RECD",
60         "SHUTDOWN_ACK_SENT",
61 };
62
63 #define SECS  * HZ
64 #define MINS  * 60 SECS
65 #define HOURS * 60 MINS
66 #define DAYS  * 24 HOURS
67
68 static unsigned int nf_ct_sctp_timeout_closed __read_mostly          =  10 SECS;
69 static unsigned int nf_ct_sctp_timeout_cookie_wait __read_mostly     =   3 SECS;
70 static unsigned int nf_ct_sctp_timeout_cookie_echoed __read_mostly   =   3 SECS;
71 static unsigned int nf_ct_sctp_timeout_established __read_mostly     =   5 DAYS;
72 static unsigned int nf_ct_sctp_timeout_shutdown_sent __read_mostly   = 300 SECS / 1000;
73 static unsigned int nf_ct_sctp_timeout_shutdown_recd __read_mostly   = 300 SECS / 1000;
74 static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
75
76 static unsigned int * sctp_timeouts[]
77 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
78     &nf_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
79     &nf_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
80     &nf_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
81     &nf_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
82     &nf_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
83     &nf_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
84     &nf_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
85  };
86
87 #define sNO SCTP_CONNTRACK_NONE
88 #define sCL SCTP_CONNTRACK_CLOSED
89 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
90 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
91 #define sES SCTP_CONNTRACK_ESTABLISHED
92 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
93 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
94 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
95 #define sIV SCTP_CONNTRACK_MAX
96
97 /* 
98         These are the descriptions of the states:
99
100 NOTE: These state names are tantalizingly similar to the states of an 
101 SCTP endpoint. But the interpretation of the states is a little different,
102 considering that these are the states of the connection and not of an end 
103 point. Please note the subtleties. -Kiran
104
105 NONE              - Nothing so far.
106 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also 
107                     an INIT_ACK chunk in the reply direction.
108 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
109 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
110 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
111 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
112 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
113                     to that of the SHUTDOWN chunk.
114 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of 
115                     the SHUTDOWN chunk. Connection is closed.
116 */
117
118 /* TODO
119  - I have assumed that the first INIT is in the original direction. 
120  This messes things when an INIT comes in the reply direction in CLOSED
121  state.
122  - Check the error type in the reply dir before transitioning from 
123 cookie echoed to closed.
124  - Sec 5.2.4 of RFC 2960
125  - Multi Homing support.
126 */
127
128 /* SCTP conntrack state transitions */
129 static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
130         {
131 /*      ORIGINAL        */
132 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
133 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
134 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
135 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
136 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
137 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
138 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
139 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
140 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
141 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
142         },
143         {
144 /*      REPLY   */
145 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
146 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
147 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
148 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
149 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
150 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
151 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
152 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
153 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
154 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
155         }
156 };
157
158 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
159                              unsigned int dataoff,
160                              struct nf_conntrack_tuple *tuple)
161 {
162         sctp_sctphdr_t _hdr, *hp;
163
164         DEBUGP(__FUNCTION__);
165         DEBUGP("\n");
166
167         /* Actually only need first 8 bytes. */
168         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
169         if (hp == NULL)
170                 return 0;
171
172         tuple->src.u.sctp.port = hp->source;
173         tuple->dst.u.sctp.port = hp->dest;
174         return 1;
175 }
176
177 static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
178                              const struct nf_conntrack_tuple *orig)
179 {
180         DEBUGP(__FUNCTION__);
181         DEBUGP("\n");
182
183         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
184         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
185         return 1;
186 }
187
188 /* Print out the per-protocol part of the tuple. */
189 static int sctp_print_tuple(struct seq_file *s,
190                             const struct nf_conntrack_tuple *tuple)
191 {
192         DEBUGP(__FUNCTION__);
193         DEBUGP("\n");
194
195         return seq_printf(s, "sport=%hu dport=%hu ",
196                           ntohs(tuple->src.u.sctp.port),
197                           ntohs(tuple->dst.u.sctp.port));
198 }
199
200 /* Print out the private part of the conntrack. */
201 static int sctp_print_conntrack(struct seq_file *s,
202                                 const struct nf_conn *conntrack)
203 {
204         enum sctp_conntrack state;
205
206         DEBUGP(__FUNCTION__);
207         DEBUGP("\n");
208
209         read_lock_bh(&sctp_lock);
210         state = conntrack->proto.sctp.state;
211         read_unlock_bh(&sctp_lock);
212
213         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
214 }
215
216 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
217 for (offset = dataoff + sizeof(sctp_sctphdr_t), count = 0;              \
218         offset < skb->len &&                                            \
219         (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));   \
220         offset += (ntohs(sch->length) + 3) & ~3, count++)
221
222 /* Some validity checks to make sure the chunks are fine */
223 static int do_basic_checks(struct nf_conn *conntrack,
224                            const struct sk_buff *skb,
225                            unsigned int dataoff,
226                            char *map)
227 {
228         u_int32_t offset, count;
229         sctp_chunkhdr_t _sch, *sch;
230         int flag;
231
232         DEBUGP(__FUNCTION__);
233         DEBUGP("\n");
234
235         flag = 0;
236
237         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
238                 DEBUGP("Chunk Num: %d  Type: %d\n", count, sch->type);
239
240                 if (sch->type == SCTP_CID_INIT 
241                         || sch->type == SCTP_CID_INIT_ACK
242                         || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
243                         flag = 1;
244                 }
245
246                 /*
247                  * Cookie Ack/Echo chunks not the first OR
248                  * Init / Init Ack / Shutdown compl chunks not the only chunks
249                  * OR zero-length.
250                  */
251                 if (((sch->type == SCTP_CID_COOKIE_ACK
252                         || sch->type == SCTP_CID_COOKIE_ECHO
253                         || flag)
254                       && count !=0) || !sch->length) {
255                         DEBUGP("Basic checks failed\n");
256                         return 1;
257                 }
258
259                 if (map) {
260                         set_bit(sch->type, (void *)map);
261                 }
262         }
263
264         DEBUGP("Basic checks passed\n");
265         return count == 0;
266 }
267
268 static int new_state(enum ip_conntrack_dir dir,
269                      enum sctp_conntrack cur_state,
270                      int chunk_type)
271 {
272         int i;
273
274         DEBUGP(__FUNCTION__);
275         DEBUGP("\n");
276
277         DEBUGP("Chunk type: %d\n", chunk_type);
278
279         switch (chunk_type) {
280                 case SCTP_CID_INIT: 
281                         DEBUGP("SCTP_CID_INIT\n");
282                         i = 0; break;
283                 case SCTP_CID_INIT_ACK: 
284                         DEBUGP("SCTP_CID_INIT_ACK\n");
285                         i = 1; break;
286                 case SCTP_CID_ABORT: 
287                         DEBUGP("SCTP_CID_ABORT\n");
288                         i = 2; break;
289                 case SCTP_CID_SHUTDOWN: 
290                         DEBUGP("SCTP_CID_SHUTDOWN\n");
291                         i = 3; break;
292                 case SCTP_CID_SHUTDOWN_ACK: 
293                         DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
294                         i = 4; break;
295                 case SCTP_CID_ERROR: 
296                         DEBUGP("SCTP_CID_ERROR\n");
297                         i = 5; break;
298                 case SCTP_CID_COOKIE_ECHO: 
299                         DEBUGP("SCTP_CID_COOKIE_ECHO\n");
300                         i = 6; break;
301                 case SCTP_CID_COOKIE_ACK: 
302                         DEBUGP("SCTP_CID_COOKIE_ACK\n");
303                         i = 7; break;
304                 case SCTP_CID_SHUTDOWN_COMPLETE: 
305                         DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
306                         i = 8; break;
307                 default:
308                         /* Other chunks like DATA, SACK, HEARTBEAT and
309                         its ACK do not cause a change in state */
310                         DEBUGP("Unknown chunk type, Will stay in %s\n", 
311                                                 sctp_conntrack_names[cur_state]);
312                         return cur_state;
313         }
314
315         DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n", 
316                         dir, sctp_conntrack_names[cur_state], chunk_type,
317                         sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
318
319         return sctp_conntracks[dir][i][cur_state];
320 }
321
322 /* Returns verdict for packet, or -1 for invalid. */
323 static int sctp_packet(struct nf_conn *conntrack,
324                        const struct sk_buff *skb,
325                        unsigned int dataoff,
326                        enum ip_conntrack_info ctinfo,
327                        int pf,
328                        unsigned int hooknum)
329 {
330         enum sctp_conntrack newconntrack, oldsctpstate;
331         sctp_sctphdr_t _sctph, *sh;
332         sctp_chunkhdr_t _sch, *sch;
333         u_int32_t offset, count;
334         char map[256 / sizeof (char)] = {0};
335
336         DEBUGP(__FUNCTION__);
337         DEBUGP("\n");
338
339         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
340         if (sh == NULL)
341                 return -1;
342
343         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
344                 return -1;
345
346         /* Check the verification tag (Sec 8.5) */
347         if (!test_bit(SCTP_CID_INIT, (void *)map)
348                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
349                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
350                 && !test_bit(SCTP_CID_ABORT, (void *)map)
351                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
352                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
353                 DEBUGP("Verification tag check failed\n");
354                 return -1;
355         }
356
357         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
358         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
359                 write_lock_bh(&sctp_lock);
360
361                 /* Special cases of Verification tag check (Sec 8.5.1) */
362                 if (sch->type == SCTP_CID_INIT) {
363                         /* Sec 8.5.1 (A) */
364                         if (sh->vtag != 0) {
365                                 write_unlock_bh(&sctp_lock);
366                                 return -1;
367                         }
368                 } else if (sch->type == SCTP_CID_ABORT) {
369                         /* Sec 8.5.1 (B) */
370                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
371                                 && !(sh->vtag == conntrack->proto.sctp.vtag
372                                                         [1 - CTINFO2DIR(ctinfo)])) {
373                                 write_unlock_bh(&sctp_lock);
374                                 return -1;
375                         }
376                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
377                         /* Sec 8.5.1 (C) */
378                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
379                                 && !(sh->vtag == conntrack->proto.sctp.vtag
380                                                         [1 - CTINFO2DIR(ctinfo)] 
381                                         && (sch->flags & 1))) {
382                                 write_unlock_bh(&sctp_lock);
383                                 return -1;
384                         }
385                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
386                         /* Sec 8.5.1 (D) */
387                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
388                                 write_unlock_bh(&sctp_lock);
389                                 return -1;
390                         }
391                 }
392
393                 oldsctpstate = conntrack->proto.sctp.state;
394                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
395
396                 /* Invalid */
397                 if (newconntrack == SCTP_CONNTRACK_MAX) {
398                         DEBUGP("nf_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
399                                CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
400                         write_unlock_bh(&sctp_lock);
401                         return -1;
402                 }
403
404                 /* If it is an INIT or an INIT ACK note down the vtag */
405                 if (sch->type == SCTP_CID_INIT 
406                         || sch->type == SCTP_CID_INIT_ACK) {
407                         sctp_inithdr_t _inithdr, *ih;
408
409                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
410                                                 sizeof(_inithdr), &_inithdr);
411                         if (ih == NULL) {
412                                         write_unlock_bh(&sctp_lock);
413                                         return -1;
414                         }
415                         DEBUGP("Setting vtag %x for dir %d\n", 
416                                         ih->init_tag, !CTINFO2DIR(ctinfo));
417                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
418                 }
419
420                 conntrack->proto.sctp.state = newconntrack;
421                 if (oldsctpstate != newconntrack)
422                         nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
423                 write_unlock_bh(&sctp_lock);
424         }
425
426         nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
427
428         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
429                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
430                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
431                 DEBUGP("Setting assured bit\n");
432                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
433                 nf_conntrack_event_cache(IPCT_STATUS, skb);
434         }
435
436         return NF_ACCEPT;
437 }
438
439 /* Called when a new connection for this protocol found. */
440 static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
441                     unsigned int dataoff)
442 {
443         enum sctp_conntrack newconntrack;
444         sctp_sctphdr_t _sctph, *sh;
445         sctp_chunkhdr_t _sch, *sch;
446         u_int32_t offset, count;
447         char map[256 / sizeof (char)] = {0};
448
449         DEBUGP(__FUNCTION__);
450         DEBUGP("\n");
451
452         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
453         if (sh == NULL)
454                 return 0;
455
456         if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
457                 return 0;
458
459         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
460         if ((test_bit (SCTP_CID_ABORT, (void *)map))
461                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
462                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
463                 return 0;
464         }
465
466         newconntrack = SCTP_CONNTRACK_MAX;
467         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
468                 /* Don't need lock here: this conntrack not in circulation yet */
469                 newconntrack = new_state(IP_CT_DIR_ORIGINAL, 
470                                          SCTP_CONNTRACK_NONE, sch->type);
471
472                 /* Invalid: delete conntrack */
473                 if (newconntrack == SCTP_CONNTRACK_MAX) {
474                         DEBUGP("nf_conntrack_sctp: invalid new deleting.\n");
475                         return 0;
476                 }
477
478                 /* Copy the vtag into the state info */
479                 if (sch->type == SCTP_CID_INIT) {
480                         if (sh->vtag == 0) {
481                                 sctp_inithdr_t _inithdr, *ih;
482
483                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
484                                                         sizeof(_inithdr), &_inithdr);
485                                 if (ih == NULL)
486                                         return 0;
487
488                                 DEBUGP("Setting vtag %x for new conn\n", 
489                                         ih->init_tag);
490
491                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = 
492                                                                 ih->init_tag;
493                         } else {
494                                 /* Sec 8.5.1 (A) */
495                                 return 0;
496                         }
497                 }
498                 /* If it is a shutdown ack OOTB packet, we expect a return
499                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
500                 else {
501                         DEBUGP("Setting vtag %x for new conn OOTB\n", 
502                                 sh->vtag);
503                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
504                 }
505
506                 conntrack->proto.sctp.state = newconntrack;
507         }
508
509         return 1;
510 }
511
512 #ifdef CONFIG_SYSCTL
513 static unsigned int sctp_sysctl_table_users;
514 static struct ctl_table_header *sctp_sysctl_header;
515 static struct ctl_table sctp_sysctl_table[] = {
516         {
517                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
518                 .procname       = "nf_conntrack_sctp_timeout_closed",
519                 .data           = &nf_ct_sctp_timeout_closed,
520                 .maxlen         = sizeof(unsigned int),
521                 .mode           = 0644,
522                 .proc_handler   = &proc_dointvec_jiffies,
523         },
524         {
525                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
526                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
527                 .data           = &nf_ct_sctp_timeout_cookie_wait,
528                 .maxlen         = sizeof(unsigned int),
529                 .mode           = 0644,
530                 .proc_handler   = &proc_dointvec_jiffies,
531         },
532         {
533                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
534                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
535                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
536                 .maxlen         = sizeof(unsigned int),
537                 .mode           = 0644,
538                 .proc_handler   = &proc_dointvec_jiffies,
539         },
540         {
541                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
542                 .procname       = "nf_conntrack_sctp_timeout_established",
543                 .data           = &nf_ct_sctp_timeout_established,
544                 .maxlen         = sizeof(unsigned int),
545                 .mode           = 0644,
546                 .proc_handler   = &proc_dointvec_jiffies,
547         },
548         {
549                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
550                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
551                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
552                 .maxlen         = sizeof(unsigned int),
553                 .mode           = 0644,
554                 .proc_handler   = &proc_dointvec_jiffies,
555         },
556         {
557                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
558                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
559                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
560                 .maxlen         = sizeof(unsigned int),
561                 .mode           = 0644,
562                 .proc_handler   = &proc_dointvec_jiffies,
563         },
564         {
565                 .ctl_name       = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
566                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
567                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
568                 .maxlen         = sizeof(unsigned int),
569                 .mode           = 0644,
570                 .proc_handler   = &proc_dointvec_jiffies,
571         },
572         {
573                 .ctl_name = 0
574         }
575 };
576
577 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
578 static struct ctl_table sctp_compat_sysctl_table[] = {
579         {
580                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
581                 .procname       = "ip_conntrack_sctp_timeout_closed",
582                 .data           = &nf_ct_sctp_timeout_closed,
583                 .maxlen         = sizeof(unsigned int),
584                 .mode           = 0644,
585                 .proc_handler   = &proc_dointvec_jiffies,
586         },
587         {
588                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
589                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
590                 .data           = &nf_ct_sctp_timeout_cookie_wait,
591                 .maxlen         = sizeof(unsigned int),
592                 .mode           = 0644,
593                 .proc_handler   = &proc_dointvec_jiffies,
594         },
595         {
596                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
597                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
598                 .data           = &nf_ct_sctp_timeout_cookie_echoed,
599                 .maxlen         = sizeof(unsigned int),
600                 .mode           = 0644,
601                 .proc_handler   = &proc_dointvec_jiffies,
602         },
603         {
604                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
605                 .procname       = "ip_conntrack_sctp_timeout_established",
606                 .data           = &nf_ct_sctp_timeout_established,
607                 .maxlen         = sizeof(unsigned int),
608                 .mode           = 0644,
609                 .proc_handler   = &proc_dointvec_jiffies,
610         },
611         {
612                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
613                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
614                 .data           = &nf_ct_sctp_timeout_shutdown_sent,
615                 .maxlen         = sizeof(unsigned int),
616                 .mode           = 0644,
617                 .proc_handler   = &proc_dointvec_jiffies,
618         },
619         {
620                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
621                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
622                 .data           = &nf_ct_sctp_timeout_shutdown_recd,
623                 .maxlen         = sizeof(unsigned int),
624                 .mode           = 0644,
625                 .proc_handler   = &proc_dointvec_jiffies,
626         },
627         {
628                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
629                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
630                 .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
631                 .maxlen         = sizeof(unsigned int),
632                 .mode           = 0644,
633                 .proc_handler   = &proc_dointvec_jiffies,
634         },
635         {
636                 .ctl_name = 0
637         }
638 };
639 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
640 #endif
641
642 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 = {
643         .l3proto                = PF_INET,
644         .l4proto                = IPPROTO_SCTP,
645         .name                   = "sctp",
646         .pkt_to_tuple           = sctp_pkt_to_tuple,
647         .invert_tuple           = sctp_invert_tuple,
648         .print_tuple            = sctp_print_tuple,
649         .print_conntrack        = sctp_print_conntrack,
650         .packet                 = sctp_packet,
651         .new                    = sctp_new,
652         .me                     = THIS_MODULE,
653 #ifdef CONFIG_SYSCTL
654         .ctl_table_users        = &sctp_sysctl_table_users,
655         .ctl_table_header       = &sctp_sysctl_header,
656         .ctl_table              = sctp_sysctl_table,
657 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
658         .ctl_compat_table       = sctp_compat_sysctl_table,
659 #endif
660 #endif
661 };
662
663 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 = {
664         .l3proto                = PF_INET6,
665         .l4proto                = IPPROTO_SCTP,
666         .name                   = "sctp",
667         .pkt_to_tuple           = sctp_pkt_to_tuple,
668         .invert_tuple           = sctp_invert_tuple,
669         .print_tuple            = sctp_print_tuple,
670         .print_conntrack        = sctp_print_conntrack,
671         .packet                 = sctp_packet,
672         .new                    = sctp_new,
673         .me                     = THIS_MODULE,
674 #ifdef CONFIG_SYSCTL
675         .ctl_table_users        = &sctp_sysctl_table_users,
676         .ctl_table_header       = &sctp_sysctl_header,
677         .ctl_table              = sctp_sysctl_table,
678 #endif
679 };
680
681 int __init nf_conntrack_proto_sctp_init(void)
682 {
683         int ret;
684
685         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
686         if (ret) {
687                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
688                 goto out;
689         }
690         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
691         if (ret) {
692                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
693                 goto cleanup_sctp4;
694         }
695
696         return ret;
697
698  cleanup_sctp4:
699         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
700  out:
701         DEBUGP("SCTP conntrack module loading %s\n", 
702                                         ret ? "failed": "succeeded");
703         return ret;
704 }
705
706 void __exit nf_conntrack_proto_sctp_fini(void)
707 {
708         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
709         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
710         DEBUGP("SCTP conntrack module unloaded\n");
711 }
712
713 module_init(nf_conntrack_proto_sctp_init);
714 module_exit(nf_conntrack_proto_sctp_fini);
715
716 MODULE_LICENSE("GPL");
717 MODULE_AUTHOR("Kiran Kumar Immidi");
718 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");