[NETFILTER]: x_tables: remove duplicate of xt_prefix
[linux-2.6.git] / net / ipv4 / netfilter / ip_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 /*
13  * Added support for proc manipulation of timeouts.
14  */
15
16 #include <linux/types.h>
17 #include <linux/timer.h>
18 #include <linux/interrupt.h>
19 #include <linux/netfilter.h>
20 #include <linux/module.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/sctp.h>
24 #include <linux/string.h>
25 #include <linux/seq_file.h>
26
27 #include <linux/netfilter_ipv4/ip_conntrack.h>
28 #include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
29
30 #if 0
31 #define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
32 #else
33 #define DEBUGP(format, args...)
34 #endif
35
36 /* Protects conntrack->proto.sctp */
37 static DEFINE_RWLOCK(sctp_lock);
38
39 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
40    closely.  They're more complex. --RR
41
42    And so for me for SCTP :D -Kiran */
43
44 static const char *sctp_conntrack_names[] = {
45         "NONE",
46         "CLOSED",
47         "COOKIE_WAIT",
48         "COOKIE_ECHOED",
49         "ESTABLISHED",
50         "SHUTDOWN_SENT",
51         "SHUTDOWN_RECD",
52         "SHUTDOWN_ACK_SENT",
53 };
54
55 #define SECS  * HZ
56 #define MINS  * 60 SECS
57 #define HOURS * 60 MINS
58 #define DAYS  * 24 HOURS
59
60 static unsigned int ip_ct_sctp_timeout_closed __read_mostly           = 10 SECS;
61 static unsigned int ip_ct_sctp_timeout_cookie_wait __read_mostly      =  3 SECS;
62 static unsigned int ip_ct_sctp_timeout_cookie_echoed __read_mostly    =  3 SECS;
63 static unsigned int ip_ct_sctp_timeout_established __read_mostly      =  5 DAYS;
64 static unsigned int ip_ct_sctp_timeout_shutdown_sent __read_mostly    = 300 SECS / 1000;
65 static unsigned int ip_ct_sctp_timeout_shutdown_recd __read_mostly    = 300 SECS / 1000;
66 static unsigned int ip_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
67
68 static const unsigned int * sctp_timeouts[]
69 = { NULL,                                  /* SCTP_CONNTRACK_NONE  */
70     &ip_ct_sctp_timeout_closed,            /* SCTP_CONNTRACK_CLOSED */
71     &ip_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
72     &ip_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
73     &ip_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
74     &ip_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
75     &ip_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
76     &ip_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
77  };
78
79 #define sNO SCTP_CONNTRACK_NONE
80 #define sCL SCTP_CONNTRACK_CLOSED
81 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
82 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
83 #define sES SCTP_CONNTRACK_ESTABLISHED
84 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
85 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
86 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
87 #define sIV SCTP_CONNTRACK_MAX
88
89 /*
90         These are the descriptions of the states:
91
92 NOTE: These state names are tantalizingly similar to the states of an
93 SCTP endpoint. But the interpretation of the states is a little different,
94 considering that these are the states of the connection and not of an end
95 point. Please note the subtleties. -Kiran
96
97 NONE              - Nothing so far.
98 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
99                     an INIT_ACK chunk in the reply direction.
100 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
101 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
102 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
103 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
104 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
105                     to that of the SHUTDOWN chunk.
106 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
107                     the SHUTDOWN chunk. Connection is closed.
108 */
109
110 /* TODO
111  - I have assumed that the first INIT is in the original direction.
112  This messes things when an INIT comes in the reply direction in CLOSED
113  state.
114  - Check the error type in the reply dir before transitioning from
115 cookie echoed to closed.
116  - Sec 5.2.4 of RFC 2960
117  - Multi Homing support.
118 */
119
120 /* SCTP conntrack state transitions */
121 static const enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
122         {
123 /*      ORIGINAL        */
124 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
125 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
126 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
127 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
128 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
129 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
130 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
131 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
132 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
133 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
134         },
135         {
136 /*      REPLY   */
137 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
138 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
139 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
140 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
141 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
142 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
143 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
144 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
145 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
146 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
147         }
148 };
149
150 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
151                              unsigned int dataoff,
152                              struct ip_conntrack_tuple *tuple)
153 {
154         sctp_sctphdr_t _hdr, *hp;
155
156         DEBUGP(__FUNCTION__);
157         DEBUGP("\n");
158
159         /* Actually only need first 8 bytes. */
160         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
161         if (hp == NULL)
162                 return 0;
163
164         tuple->src.u.sctp.port = hp->source;
165         tuple->dst.u.sctp.port = hp->dest;
166         return 1;
167 }
168
169 static int sctp_invert_tuple(struct ip_conntrack_tuple *tuple,
170                              const struct ip_conntrack_tuple *orig)
171 {
172         DEBUGP(__FUNCTION__);
173         DEBUGP("\n");
174
175         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
176         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
177         return 1;
178 }
179
180 /* Print out the per-protocol part of the tuple. */
181 static int sctp_print_tuple(struct seq_file *s,
182                             const struct ip_conntrack_tuple *tuple)
183 {
184         DEBUGP(__FUNCTION__);
185         DEBUGP("\n");
186
187         return seq_printf(s, "sport=%hu dport=%hu ",
188                           ntohs(tuple->src.u.sctp.port),
189                           ntohs(tuple->dst.u.sctp.port));
190 }
191
192 /* Print out the private part of the conntrack. */
193 static int sctp_print_conntrack(struct seq_file *s,
194                                 const struct ip_conntrack *conntrack)
195 {
196         enum sctp_conntrack state;
197
198         DEBUGP(__FUNCTION__);
199         DEBUGP("\n");
200
201         read_lock_bh(&sctp_lock);
202         state = conntrack->proto.sctp.state;
203         read_unlock_bh(&sctp_lock);
204
205         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
206 }
207
208 #define for_each_sctp_chunk(skb, sch, _sch, offset, count)              \
209 for (offset = ip_hdrlen(skb) + sizeof(sctp_sctphdr_t), count = 0;       \
210         offset < skb->len &&                                            \
211         (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch));   \
212         offset += (ntohs(sch->length) + 3) & ~3, count++)
213
214 /* Some validity checks to make sure the chunks are fine */
215 static int do_basic_checks(struct ip_conntrack *conntrack,
216                            const struct sk_buff *skb,
217                            char *map)
218 {
219         u_int32_t offset, count;
220         sctp_chunkhdr_t _sch, *sch;
221         int flag;
222
223         DEBUGP(__FUNCTION__);
224         DEBUGP("\n");
225
226         flag = 0;
227
228         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
229                 DEBUGP("Chunk Num: %d  Type: %d\n", count, sch->type);
230
231                 if (sch->type == SCTP_CID_INIT
232                         || sch->type == SCTP_CID_INIT_ACK
233                         || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
234                         flag = 1;
235                 }
236
237                 /*
238                  * Cookie Ack/Echo chunks not the first OR
239                  * Init / Init Ack / Shutdown compl chunks not the only chunks
240                  * OR zero-length.
241                  */
242                 if (((sch->type == SCTP_CID_COOKIE_ACK
243                         || sch->type == SCTP_CID_COOKIE_ECHO
244                         || flag)
245                       && count !=0) || !sch->length) {
246                         DEBUGP("Basic checks failed\n");
247                         return 1;
248                 }
249
250                 if (map) {
251                         set_bit(sch->type, (void *)map);
252                 }
253         }
254
255         DEBUGP("Basic checks passed\n");
256         return count == 0;
257 }
258
259 static int new_state(enum ip_conntrack_dir dir,
260                      enum sctp_conntrack cur_state,
261                      int chunk_type)
262 {
263         int i;
264
265         DEBUGP(__FUNCTION__);
266         DEBUGP("\n");
267
268         DEBUGP("Chunk type: %d\n", chunk_type);
269
270         switch (chunk_type) {
271                 case SCTP_CID_INIT:
272                         DEBUGP("SCTP_CID_INIT\n");
273                         i = 0; break;
274                 case SCTP_CID_INIT_ACK:
275                         DEBUGP("SCTP_CID_INIT_ACK\n");
276                         i = 1; break;
277                 case SCTP_CID_ABORT:
278                         DEBUGP("SCTP_CID_ABORT\n");
279                         i = 2; break;
280                 case SCTP_CID_SHUTDOWN:
281                         DEBUGP("SCTP_CID_SHUTDOWN\n");
282                         i = 3; break;
283                 case SCTP_CID_SHUTDOWN_ACK:
284                         DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
285                         i = 4; break;
286                 case SCTP_CID_ERROR:
287                         DEBUGP("SCTP_CID_ERROR\n");
288                         i = 5; break;
289                 case SCTP_CID_COOKIE_ECHO:
290                         DEBUGP("SCTP_CID_COOKIE_ECHO\n");
291                         i = 6; break;
292                 case SCTP_CID_COOKIE_ACK:
293                         DEBUGP("SCTP_CID_COOKIE_ACK\n");
294                         i = 7; break;
295                 case SCTP_CID_SHUTDOWN_COMPLETE:
296                         DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
297                         i = 8; break;
298                 default:
299                         /* Other chunks like DATA, SACK, HEARTBEAT and
300                         its ACK do not cause a change in state */
301                         DEBUGP("Unknown chunk type, Will stay in %s\n",
302                                                 sctp_conntrack_names[cur_state]);
303                         return cur_state;
304         }
305
306         DEBUGP("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
307                         dir, sctp_conntrack_names[cur_state], chunk_type,
308                         sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
309
310         return sctp_conntracks[dir][i][cur_state];
311 }
312
313 /* Returns verdict for packet, or -1 for invalid. */
314 static int sctp_packet(struct ip_conntrack *conntrack,
315                        const struct sk_buff *skb,
316                        enum ip_conntrack_info ctinfo)
317 {
318         enum sctp_conntrack newconntrack, oldsctpstate;
319         struct iphdr *iph = ip_hdr(skb);
320         sctp_sctphdr_t _sctph, *sh;
321         sctp_chunkhdr_t _sch, *sch;
322         u_int32_t offset, count;
323         char map[256 / sizeof (char)] = {0};
324
325         DEBUGP(__FUNCTION__);
326         DEBUGP("\n");
327
328         sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
329         if (sh == NULL)
330                 return -1;
331
332         if (do_basic_checks(conntrack, skb, map) != 0)
333                 return -1;
334
335         /* Check the verification tag (Sec 8.5) */
336         if (!test_bit(SCTP_CID_INIT, (void *)map)
337                 && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
338                 && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
339                 && !test_bit(SCTP_CID_ABORT, (void *)map)
340                 && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
341                 && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
342                 DEBUGP("Verification tag check failed\n");
343                 return -1;
344         }
345
346         oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
347         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
348                 write_lock_bh(&sctp_lock);
349
350                 /* Special cases of Verification tag check (Sec 8.5.1) */
351                 if (sch->type == SCTP_CID_INIT) {
352                         /* Sec 8.5.1 (A) */
353                         if (sh->vtag != 0) {
354                                 write_unlock_bh(&sctp_lock);
355                                 return -1;
356                         }
357                 } else if (sch->type == SCTP_CID_ABORT) {
358                         /* Sec 8.5.1 (B) */
359                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
360                                 && !(sh->vtag == conntrack->proto.sctp.vtag
361                                                         [1 - CTINFO2DIR(ctinfo)])) {
362                                 write_unlock_bh(&sctp_lock);
363                                 return -1;
364                         }
365                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
366                         /* Sec 8.5.1 (C) */
367                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
368                                 && !(sh->vtag == conntrack->proto.sctp.vtag
369                                                         [1 - CTINFO2DIR(ctinfo)]
370                                         && (sch->flags & 1))) {
371                                 write_unlock_bh(&sctp_lock);
372                                 return -1;
373                         }
374                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
375                         /* Sec 8.5.1 (D) */
376                         if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
377                                 write_unlock_bh(&sctp_lock);
378                                 return -1;
379                         }
380                 }
381
382                 oldsctpstate = conntrack->proto.sctp.state;
383                 newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
384
385                 /* Invalid */
386                 if (newconntrack == SCTP_CONNTRACK_MAX) {
387                         DEBUGP("ip_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
388                                CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
389                         write_unlock_bh(&sctp_lock);
390                         return -1;
391                 }
392
393                 /* If it is an INIT or an INIT ACK note down the vtag */
394                 if (sch->type == SCTP_CID_INIT
395                         || sch->type == SCTP_CID_INIT_ACK) {
396                         sctp_inithdr_t _inithdr, *ih;
397
398                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
399                                                 sizeof(_inithdr), &_inithdr);
400                         if (ih == NULL) {
401                                         write_unlock_bh(&sctp_lock);
402                                         return -1;
403                         }
404                         DEBUGP("Setting vtag %x for dir %d\n",
405                                         ih->init_tag, !CTINFO2DIR(ctinfo));
406                         conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
407                 }
408
409                 conntrack->proto.sctp.state = newconntrack;
410                 if (oldsctpstate != newconntrack)
411                         ip_conntrack_event_cache(IPCT_PROTOINFO, skb);
412                 write_unlock_bh(&sctp_lock);
413         }
414
415         ip_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
416
417         if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
418                 && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
419                 && newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
420                 DEBUGP("Setting assured bit\n");
421                 set_bit(IPS_ASSURED_BIT, &conntrack->status);
422                 ip_conntrack_event_cache(IPCT_STATUS, skb);
423         }
424
425         return NF_ACCEPT;
426 }
427
428 /* Called when a new connection for this protocol found. */
429 static int sctp_new(struct ip_conntrack *conntrack,
430                     const struct sk_buff *skb)
431 {
432         enum sctp_conntrack newconntrack;
433         struct iphdr *iph = ip_hdr(skb);
434         sctp_sctphdr_t _sctph, *sh;
435         sctp_chunkhdr_t _sch, *sch;
436         u_int32_t offset, count;
437         char map[256 / sizeof (char)] = {0};
438
439         DEBUGP(__FUNCTION__);
440         DEBUGP("\n");
441
442         sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
443         if (sh == NULL)
444                 return 0;
445
446         if (do_basic_checks(conntrack, skb, map) != 0)
447                 return 0;
448
449         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
450         if ((test_bit (SCTP_CID_ABORT, (void *)map))
451                 || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
452                 || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
453                 return 0;
454         }
455
456         newconntrack = SCTP_CONNTRACK_MAX;
457         for_each_sctp_chunk (skb, sch, _sch, offset, count) {
458                 /* Don't need lock here: this conntrack not in circulation yet */
459                 newconntrack = new_state (IP_CT_DIR_ORIGINAL,
460                                                 SCTP_CONNTRACK_NONE, sch->type);
461
462                 /* Invalid: delete conntrack */
463                 if (newconntrack == SCTP_CONNTRACK_MAX) {
464                         DEBUGP("ip_conntrack_sctp: invalid new deleting.\n");
465                         return 0;
466                 }
467
468                 /* Copy the vtag into the state info */
469                 if (sch->type == SCTP_CID_INIT) {
470                         if (sh->vtag == 0) {
471                                 sctp_inithdr_t _inithdr, *ih;
472
473                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
474                                                         sizeof(_inithdr), &_inithdr);
475                                 if (ih == NULL)
476                                         return 0;
477
478                                 DEBUGP("Setting vtag %x for new conn\n",
479                                         ih->init_tag);
480
481                                 conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
482                                                                 ih->init_tag;
483                         } else {
484                                 /* Sec 8.5.1 (A) */
485                                 return 0;
486                         }
487                 }
488                 /* If it is a shutdown ack OOTB packet, we expect a return
489                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
490                 else {
491                         DEBUGP("Setting vtag %x for new conn OOTB\n",
492                                 sh->vtag);
493                         conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
494                 }
495
496                 conntrack->proto.sctp.state = newconntrack;
497         }
498
499         return 1;
500 }
501
502 static struct ip_conntrack_protocol ip_conntrack_protocol_sctp = {
503         .proto           = IPPROTO_SCTP,
504         .name            = "sctp",
505         .pkt_to_tuple    = sctp_pkt_to_tuple,
506         .invert_tuple    = sctp_invert_tuple,
507         .print_tuple     = sctp_print_tuple,
508         .print_conntrack = sctp_print_conntrack,
509         .packet          = sctp_packet,
510         .new             = sctp_new,
511         .destroy         = NULL,
512         .me              = THIS_MODULE,
513 #if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
514     defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
515         .tuple_to_nfattr = ip_ct_port_tuple_to_nfattr,
516         .nfattr_to_tuple = ip_ct_port_nfattr_to_tuple,
517 #endif
518 };
519
520 #ifdef CONFIG_SYSCTL
521 static ctl_table ip_ct_sysctl_table[] = {
522         {
523                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
524                 .procname       = "ip_conntrack_sctp_timeout_closed",
525                 .data           = &ip_ct_sctp_timeout_closed,
526                 .maxlen         = sizeof(unsigned int),
527                 .mode           = 0644,
528                 .proc_handler   = &proc_dointvec_jiffies,
529         },
530         {
531                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
532                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
533                 .data           = &ip_ct_sctp_timeout_cookie_wait,
534                 .maxlen         = sizeof(unsigned int),
535                 .mode           = 0644,
536                 .proc_handler   = &proc_dointvec_jiffies,
537         },
538         {
539                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
540                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
541                 .data           = &ip_ct_sctp_timeout_cookie_echoed,
542                 .maxlen         = sizeof(unsigned int),
543                 .mode           = 0644,
544                 .proc_handler   = &proc_dointvec_jiffies,
545         },
546         {
547                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
548                 .procname       = "ip_conntrack_sctp_timeout_established",
549                 .data           = &ip_ct_sctp_timeout_established,
550                 .maxlen         = sizeof(unsigned int),
551                 .mode           = 0644,
552                 .proc_handler   = &proc_dointvec_jiffies,
553         },
554         {
555                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
556                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
557                 .data           = &ip_ct_sctp_timeout_shutdown_sent,
558                 .maxlen         = sizeof(unsigned int),
559                 .mode           = 0644,
560                 .proc_handler   = &proc_dointvec_jiffies,
561         },
562         {
563                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
564                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
565                 .data           = &ip_ct_sctp_timeout_shutdown_recd,
566                 .maxlen         = sizeof(unsigned int),
567                 .mode           = 0644,
568                 .proc_handler   = &proc_dointvec_jiffies,
569         },
570         {
571                 .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
572                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
573                 .data           = &ip_ct_sctp_timeout_shutdown_ack_sent,
574                 .maxlen         = sizeof(unsigned int),
575                 .mode           = 0644,
576                 .proc_handler   = &proc_dointvec_jiffies,
577         },
578         { .ctl_name = 0 }
579 };
580
581 static ctl_table ip_ct_netfilter_table[] = {
582         {
583                 .ctl_name       = NET_IPV4_NETFILTER,
584                 .procname       = "netfilter",
585                 .mode           = 0555,
586                 .child          = ip_ct_sysctl_table,
587         },
588         { .ctl_name = 0 }
589 };
590
591 static ctl_table ip_ct_ipv4_table[] = {
592         {
593                 .ctl_name       = NET_IPV4,
594                 .procname       = "ipv4",
595                 .mode           = 0555,
596                 .child          = ip_ct_netfilter_table,
597         },
598         { .ctl_name = 0 }
599 };
600
601 static ctl_table ip_ct_net_table[] = {
602         {
603                 .ctl_name       = CTL_NET,
604                 .procname       = "net",
605                 .mode           = 0555,
606                 .child          = ip_ct_ipv4_table,
607         },
608         { .ctl_name = 0 }
609 };
610
611 static struct ctl_table_header *ip_ct_sysctl_header;
612 #endif
613
614 static int __init ip_conntrack_proto_sctp_init(void)
615 {
616         int ret;
617
618         ret = ip_conntrack_protocol_register(&ip_conntrack_protocol_sctp);
619         if (ret) {
620                 printk("ip_conntrack_proto_sctp: protocol register failed\n");
621                 goto out;
622         }
623
624 #ifdef CONFIG_SYSCTL
625         ip_ct_sysctl_header = register_sysctl_table(ip_ct_net_table);
626         if (ip_ct_sysctl_header == NULL) {
627                 ret = -ENOMEM;
628                 printk("ip_conntrack_proto_sctp: can't register to sysctl.\n");
629                 goto cleanup;
630         }
631 #endif
632
633         return ret;
634
635 #ifdef CONFIG_SYSCTL
636  cleanup:
637         ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
638 #endif
639  out:
640         DEBUGP("SCTP conntrack module loading %s\n",
641                                         ret ? "failed": "succeeded");
642         return ret;
643 }
644
645 static void __exit ip_conntrack_proto_sctp_fini(void)
646 {
647         ip_conntrack_protocol_unregister(&ip_conntrack_protocol_sctp);
648 #ifdef CONFIG_SYSCTL
649         unregister_sysctl_table(ip_ct_sysctl_header);
650 #endif
651         DEBUGP("SCTP conntrack module unloaded\n");
652 }
653
654 module_init(ip_conntrack_proto_sctp_init);
655 module_exit(ip_conntrack_proto_sctp_fini);
656
657 MODULE_LICENSE("GPL");
658 MODULE_AUTHOR("Kiran Kumar Immidi");
659 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");