netfilter: nf_conntrack: don't always initialize ct->proto
[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 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
29    closely.  They're more complex. --RR
30
31    And so for me for SCTP :D -Kiran */
32
33 static const char *const sctp_conntrack_names[] = {
34         "NONE",
35         "CLOSED",
36         "COOKIE_WAIT",
37         "COOKIE_ECHOED",
38         "ESTABLISHED",
39         "SHUTDOWN_SENT",
40         "SHUTDOWN_RECD",
41         "SHUTDOWN_ACK_SENT",
42 };
43
44 #define SECS  * HZ
45 #define MINS  * 60 SECS
46 #define HOURS * 60 MINS
47 #define DAYS  * 24 HOURS
48
49 static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = {
50         [SCTP_CONNTRACK_CLOSED]                 = 10 SECS,
51         [SCTP_CONNTRACK_COOKIE_WAIT]            = 3 SECS,
52         [SCTP_CONNTRACK_COOKIE_ECHOED]          = 3 SECS,
53         [SCTP_CONNTRACK_ESTABLISHED]            = 5 DAYS,
54         [SCTP_CONNTRACK_SHUTDOWN_SENT]          = 300 SECS / 1000,
55         [SCTP_CONNTRACK_SHUTDOWN_RECD]          = 300 SECS / 1000,
56         [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]      = 3 SECS,
57 };
58
59 #define sNO SCTP_CONNTRACK_NONE
60 #define sCL SCTP_CONNTRACK_CLOSED
61 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
62 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
63 #define sES SCTP_CONNTRACK_ESTABLISHED
64 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
65 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
66 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
67 #define sIV SCTP_CONNTRACK_MAX
68
69 /*
70         These are the descriptions of the states:
71
72 NOTE: These state names are tantalizingly similar to the states of an
73 SCTP endpoint. But the interpretation of the states is a little different,
74 considering that these are the states of the connection and not of an end
75 point. Please note the subtleties. -Kiran
76
77 NONE              - Nothing so far.
78 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
79                     an INIT_ACK chunk in the reply direction.
80 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
81 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
82 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
83 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
84 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
85                     to that of the SHUTDOWN chunk.
86 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
87                     the SHUTDOWN chunk. Connection is closed.
88 */
89
90 /* TODO
91  - I have assumed that the first INIT is in the original direction.
92  This messes things when an INIT comes in the reply direction in CLOSED
93  state.
94  - Check the error type in the reply dir before transitioning from
95 cookie echoed to closed.
96  - Sec 5.2.4 of RFC 2960
97  - Multi Homing support.
98 */
99
100 /* SCTP conntrack state transitions */
101 static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
102         {
103 /*      ORIGINAL        */
104 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
105 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
106 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
107 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
108 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
109 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
110 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
111 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
112 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
113 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
114         },
115         {
116 /*      REPLY   */
117 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
118 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
119 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
120 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
121 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
122 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
123 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
124 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
125 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
126 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
127         }
128 };
129
130 static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
131                               struct nf_conntrack_tuple *tuple)
132 {
133         const struct sctphdr *hp;
134         struct sctphdr _hdr;
135
136         /* Actually only need first 8 bytes. */
137         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
138         if (hp == NULL)
139                 return false;
140
141         tuple->src.u.sctp.port = hp->source;
142         tuple->dst.u.sctp.port = hp->dest;
143         return true;
144 }
145
146 static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
147                               const struct nf_conntrack_tuple *orig)
148 {
149         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
150         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
151         return true;
152 }
153
154 /* Print out the per-protocol part of the tuple. */
155 static int sctp_print_tuple(struct seq_file *s,
156                             const struct nf_conntrack_tuple *tuple)
157 {
158         return seq_printf(s, "sport=%hu dport=%hu ",
159                           ntohs(tuple->src.u.sctp.port),
160                           ntohs(tuple->dst.u.sctp.port));
161 }
162
163 /* Print out the private part of the conntrack. */
164 static int sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
165 {
166         enum sctp_conntrack state;
167
168         spin_lock_bh(&ct->lock);
169         state = ct->proto.sctp.state;
170         spin_unlock_bh(&ct->lock);
171
172         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
173 }
174
175 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
176 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0;        \
177         (offset) < (skb)->len &&                                        \
178         ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch)));   \
179         (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
180
181 /* Some validity checks to make sure the chunks are fine */
182 static int do_basic_checks(struct nf_conn *ct,
183                            const struct sk_buff *skb,
184                            unsigned int dataoff,
185                            unsigned long *map)
186 {
187         u_int32_t offset, count;
188         sctp_chunkhdr_t _sch, *sch;
189         int flag;
190
191         flag = 0;
192
193         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
194                 pr_debug("Chunk Num: %d  Type: %d\n", count, sch->type);
195
196                 if (sch->type == SCTP_CID_INIT ||
197                     sch->type == SCTP_CID_INIT_ACK ||
198                     sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
199                         flag = 1;
200
201                 /*
202                  * Cookie Ack/Echo chunks not the first OR
203                  * Init / Init Ack / Shutdown compl chunks not the only chunks
204                  * OR zero-length.
205                  */
206                 if (((sch->type == SCTP_CID_COOKIE_ACK ||
207                       sch->type == SCTP_CID_COOKIE_ECHO ||
208                       flag) &&
209                      count != 0) || !sch->length) {
210                         pr_debug("Basic checks failed\n");
211                         return 1;
212                 }
213
214                 if (map)
215                         set_bit(sch->type, map);
216         }
217
218         pr_debug("Basic checks passed\n");
219         return count == 0;
220 }
221
222 static int sctp_new_state(enum ip_conntrack_dir dir,
223                           enum sctp_conntrack cur_state,
224                           int chunk_type)
225 {
226         int i;
227
228         pr_debug("Chunk type: %d\n", chunk_type);
229
230         switch (chunk_type) {
231         case SCTP_CID_INIT:
232                 pr_debug("SCTP_CID_INIT\n");
233                 i = 0;
234                 break;
235         case SCTP_CID_INIT_ACK:
236                 pr_debug("SCTP_CID_INIT_ACK\n");
237                 i = 1;
238                 break;
239         case SCTP_CID_ABORT:
240                 pr_debug("SCTP_CID_ABORT\n");
241                 i = 2;
242                 break;
243         case SCTP_CID_SHUTDOWN:
244                 pr_debug("SCTP_CID_SHUTDOWN\n");
245                 i = 3;
246                 break;
247         case SCTP_CID_SHUTDOWN_ACK:
248                 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
249                 i = 4;
250                 break;
251         case SCTP_CID_ERROR:
252                 pr_debug("SCTP_CID_ERROR\n");
253                 i = 5;
254                 break;
255         case SCTP_CID_COOKIE_ECHO:
256                 pr_debug("SCTP_CID_COOKIE_ECHO\n");
257                 i = 6;
258                 break;
259         case SCTP_CID_COOKIE_ACK:
260                 pr_debug("SCTP_CID_COOKIE_ACK\n");
261                 i = 7;
262                 break;
263         case SCTP_CID_SHUTDOWN_COMPLETE:
264                 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
265                 i = 8;
266                 break;
267         default:
268                 /* Other chunks like DATA, SACK, HEARTBEAT and
269                 its ACK do not cause a change in state */
270                 pr_debug("Unknown chunk type, Will stay in %s\n",
271                          sctp_conntrack_names[cur_state]);
272                 return cur_state;
273         }
274
275         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
276                  dir, sctp_conntrack_names[cur_state], chunk_type,
277                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
278
279         return sctp_conntracks[dir][i][cur_state];
280 }
281
282 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
283 static int sctp_packet(struct nf_conn *ct,
284                        const struct sk_buff *skb,
285                        unsigned int dataoff,
286                        enum ip_conntrack_info ctinfo,
287                        u_int8_t pf,
288                        unsigned int hooknum)
289 {
290         enum sctp_conntrack new_state, old_state;
291         enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
292         const struct sctphdr *sh;
293         struct sctphdr _sctph;
294         const struct sctp_chunkhdr *sch;
295         struct sctp_chunkhdr _sch;
296         u_int32_t offset, count;
297         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
298
299         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
300         if (sh == NULL)
301                 goto out;
302
303         if (do_basic_checks(ct, skb, dataoff, map) != 0)
304                 goto out;
305
306         /* Check the verification tag (Sec 8.5) */
307         if (!test_bit(SCTP_CID_INIT, map) &&
308             !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
309             !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
310             !test_bit(SCTP_CID_ABORT, map) &&
311             !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
312             sh->vtag != ct->proto.sctp.vtag[dir]) {
313                 pr_debug("Verification tag check failed\n");
314                 goto out;
315         }
316
317         old_state = new_state = SCTP_CONNTRACK_NONE;
318         spin_lock_bh(&ct->lock);
319         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
320                 /* Special cases of Verification tag check (Sec 8.5.1) */
321                 if (sch->type == SCTP_CID_INIT) {
322                         /* Sec 8.5.1 (A) */
323                         if (sh->vtag != 0)
324                                 goto out_unlock;
325                 } else if (sch->type == SCTP_CID_ABORT) {
326                         /* Sec 8.5.1 (B) */
327                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
328                             sh->vtag != ct->proto.sctp.vtag[!dir])
329                                 goto out_unlock;
330                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
331                         /* Sec 8.5.1 (C) */
332                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
333                             sh->vtag != ct->proto.sctp.vtag[!dir] &&
334                             sch->flags & SCTP_CHUNK_FLAG_T)
335                                 goto out_unlock;
336                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
337                         /* Sec 8.5.1 (D) */
338                         if (sh->vtag != ct->proto.sctp.vtag[dir])
339                                 goto out_unlock;
340                 }
341
342                 old_state = ct->proto.sctp.state;
343                 new_state = sctp_new_state(dir, old_state, sch->type);
344
345                 /* Invalid */
346                 if (new_state == SCTP_CONNTRACK_MAX) {
347                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
348                                  "conntrack=%u\n",
349                                  dir, sch->type, old_state);
350                         goto out_unlock;
351                 }
352
353                 /* If it is an INIT or an INIT ACK note down the vtag */
354                 if (sch->type == SCTP_CID_INIT ||
355                     sch->type == SCTP_CID_INIT_ACK) {
356                         sctp_inithdr_t _inithdr, *ih;
357
358                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
359                                                 sizeof(_inithdr), &_inithdr);
360                         if (ih == NULL)
361                                 goto out_unlock;
362                         pr_debug("Setting vtag %x for dir %d\n",
363                                  ih->init_tag, !dir);
364                         ct->proto.sctp.vtag[!dir] = ih->init_tag;
365                 }
366
367                 ct->proto.sctp.state = new_state;
368                 if (old_state != new_state)
369                         nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
370         }
371         spin_unlock_bh(&ct->lock);
372
373         nf_ct_refresh_acct(ct, ctinfo, skb, sctp_timeouts[new_state]);
374
375         if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
376             dir == IP_CT_DIR_REPLY &&
377             new_state == SCTP_CONNTRACK_ESTABLISHED) {
378                 pr_debug("Setting assured bit\n");
379                 set_bit(IPS_ASSURED_BIT, &ct->status);
380                 nf_conntrack_event_cache(IPCT_ASSURED, ct);
381         }
382
383         return NF_ACCEPT;
384
385 out_unlock:
386         spin_unlock_bh(&ct->lock);
387 out:
388         return -NF_ACCEPT;
389 }
390
391 /* Called when a new connection for this protocol found. */
392 static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
393                      unsigned int dataoff)
394 {
395         enum sctp_conntrack new_state;
396         const struct sctphdr *sh;
397         struct sctphdr _sctph;
398         const struct sctp_chunkhdr *sch;
399         struct sctp_chunkhdr _sch;
400         u_int32_t offset, count;
401         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
402
403         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
404         if (sh == NULL)
405                 return false;
406
407         if (do_basic_checks(ct, skb, dataoff, map) != 0)
408                 return false;
409
410         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
411         if (test_bit(SCTP_CID_ABORT, map) ||
412             test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
413             test_bit(SCTP_CID_COOKIE_ACK, map))
414                 return false;
415
416         memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp));
417         new_state = SCTP_CONNTRACK_MAX;
418         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
419                 /* Don't need lock here: this conntrack not in circulation yet */
420                 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
421                                            SCTP_CONNTRACK_NONE, sch->type);
422
423                 /* Invalid: delete conntrack */
424                 if (new_state == SCTP_CONNTRACK_NONE ||
425                     new_state == SCTP_CONNTRACK_MAX) {
426                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
427                         return false;
428                 }
429
430                 /* Copy the vtag into the state info */
431                 if (sch->type == SCTP_CID_INIT) {
432                         if (sh->vtag == 0) {
433                                 sctp_inithdr_t _inithdr, *ih;
434
435                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
436                                                         sizeof(_inithdr), &_inithdr);
437                                 if (ih == NULL)
438                                         return false;
439
440                                 pr_debug("Setting vtag %x for new conn\n",
441                                          ih->init_tag);
442
443                                 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
444                                                                 ih->init_tag;
445                         } else {
446                                 /* Sec 8.5.1 (A) */
447                                 return false;
448                         }
449                 }
450                 /* If it is a shutdown ack OOTB packet, we expect a return
451                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
452                 else {
453                         pr_debug("Setting vtag %x for new conn OOTB\n",
454                                  sh->vtag);
455                         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
456                 }
457
458                 ct->proto.sctp.state = new_state;
459         }
460
461         return true;
462 }
463
464 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
465
466 #include <linux/netfilter/nfnetlink.h>
467 #include <linux/netfilter/nfnetlink_conntrack.h>
468
469 static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
470                           struct nf_conn *ct)
471 {
472         struct nlattr *nest_parms;
473
474         spin_lock_bh(&ct->lock);
475         nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED);
476         if (!nest_parms)
477                 goto nla_put_failure;
478
479         NLA_PUT_U8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state);
480
481         NLA_PUT_BE32(skb,
482                      CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
483                      ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]);
484
485         NLA_PUT_BE32(skb,
486                      CTA_PROTOINFO_SCTP_VTAG_REPLY,
487                      ct->proto.sctp.vtag[IP_CT_DIR_REPLY]);
488
489         spin_unlock_bh(&ct->lock);
490
491         nla_nest_end(skb, nest_parms);
492
493         return 0;
494
495 nla_put_failure:
496         spin_unlock_bh(&ct->lock);
497         return -1;
498 }
499
500 static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
501         [CTA_PROTOINFO_SCTP_STATE]          = { .type = NLA_U8 },
502         [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]  = { .type = NLA_U32 },
503         [CTA_PROTOINFO_SCTP_VTAG_REPLY]     = { .type = NLA_U32 },
504 };
505
506 static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
507 {
508         struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
509         struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1];
510         int err;
511
512         /* updates may not contain the internal protocol info, skip parsing */
513         if (!attr)
514                 return 0;
515
516         err = nla_parse_nested(tb,
517                                CTA_PROTOINFO_SCTP_MAX,
518                                attr,
519                                sctp_nla_policy);
520         if (err < 0)
521                 return err;
522
523         if (!tb[CTA_PROTOINFO_SCTP_STATE] ||
524             !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] ||
525             !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY])
526                 return -EINVAL;
527
528         spin_lock_bh(&ct->lock);
529         ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]);
530         ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] =
531                 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]);
532         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
533                 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]);
534         spin_unlock_bh(&ct->lock);
535
536         return 0;
537 }
538
539 static int sctp_nlattr_size(void)
540 {
541         return nla_total_size(0)        /* CTA_PROTOINFO_SCTP */
542                 + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1);
543 }
544 #endif
545
546 #ifdef CONFIG_SYSCTL
547 static unsigned int sctp_sysctl_table_users;
548 static struct ctl_table_header *sctp_sysctl_header;
549 static struct ctl_table sctp_sysctl_table[] = {
550         {
551                 .procname       = "nf_conntrack_sctp_timeout_closed",
552                 .data           = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
553                 .maxlen         = sizeof(unsigned int),
554                 .mode           = 0644,
555                 .proc_handler   = proc_dointvec_jiffies,
556         },
557         {
558                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
559                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
560                 .maxlen         = sizeof(unsigned int),
561                 .mode           = 0644,
562                 .proc_handler   = proc_dointvec_jiffies,
563         },
564         {
565                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
566                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
567                 .maxlen         = sizeof(unsigned int),
568                 .mode           = 0644,
569                 .proc_handler   = proc_dointvec_jiffies,
570         },
571         {
572                 .procname       = "nf_conntrack_sctp_timeout_established",
573                 .data           = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
574                 .maxlen         = sizeof(unsigned int),
575                 .mode           = 0644,
576                 .proc_handler   = proc_dointvec_jiffies,
577         },
578         {
579                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
580                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
581                 .maxlen         = sizeof(unsigned int),
582                 .mode           = 0644,
583                 .proc_handler   = proc_dointvec_jiffies,
584         },
585         {
586                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
587                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
588                 .maxlen         = sizeof(unsigned int),
589                 .mode           = 0644,
590                 .proc_handler   = proc_dointvec_jiffies,
591         },
592         {
593                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
594                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
595                 .maxlen         = sizeof(unsigned int),
596                 .mode           = 0644,
597                 .proc_handler   = proc_dointvec_jiffies,
598         },
599         { }
600 };
601
602 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
603 static struct ctl_table sctp_compat_sysctl_table[] = {
604         {
605                 .procname       = "ip_conntrack_sctp_timeout_closed",
606                 .data           = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
607                 .maxlen         = sizeof(unsigned int),
608                 .mode           = 0644,
609                 .proc_handler   = proc_dointvec_jiffies,
610         },
611         {
612                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
613                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
614                 .maxlen         = sizeof(unsigned int),
615                 .mode           = 0644,
616                 .proc_handler   = proc_dointvec_jiffies,
617         },
618         {
619                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
620                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
621                 .maxlen         = sizeof(unsigned int),
622                 .mode           = 0644,
623                 .proc_handler   = proc_dointvec_jiffies,
624         },
625         {
626                 .procname       = "ip_conntrack_sctp_timeout_established",
627                 .data           = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
628                 .maxlen         = sizeof(unsigned int),
629                 .mode           = 0644,
630                 .proc_handler   = proc_dointvec_jiffies,
631         },
632         {
633                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
634                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
635                 .maxlen         = sizeof(unsigned int),
636                 .mode           = 0644,
637                 .proc_handler   = proc_dointvec_jiffies,
638         },
639         {
640                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
641                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
642                 .maxlen         = sizeof(unsigned int),
643                 .mode           = 0644,
644                 .proc_handler   = proc_dointvec_jiffies,
645         },
646         {
647                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
648                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
649                 .maxlen         = sizeof(unsigned int),
650                 .mode           = 0644,
651                 .proc_handler   = proc_dointvec_jiffies,
652         },
653         { }
654 };
655 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
656 #endif
657
658 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
659         .l3proto                = PF_INET,
660         .l4proto                = IPPROTO_SCTP,
661         .name                   = "sctp",
662         .pkt_to_tuple           = sctp_pkt_to_tuple,
663         .invert_tuple           = sctp_invert_tuple,
664         .print_tuple            = sctp_print_tuple,
665         .print_conntrack        = sctp_print_conntrack,
666         .packet                 = sctp_packet,
667         .new                    = sctp_new,
668         .me                     = THIS_MODULE,
669 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
670         .to_nlattr              = sctp_to_nlattr,
671         .nlattr_size            = sctp_nlattr_size,
672         .from_nlattr            = nlattr_to_sctp,
673         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
674         .nlattr_tuple_size      = nf_ct_port_nlattr_tuple_size,
675         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
676         .nla_policy             = nf_ct_port_nla_policy,
677 #endif
678 #ifdef CONFIG_SYSCTL
679         .ctl_table_users        = &sctp_sysctl_table_users,
680         .ctl_table_header       = &sctp_sysctl_header,
681         .ctl_table              = sctp_sysctl_table,
682 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
683         .ctl_compat_table       = sctp_compat_sysctl_table,
684 #endif
685 #endif
686 };
687
688 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
689         .l3proto                = PF_INET6,
690         .l4proto                = IPPROTO_SCTP,
691         .name                   = "sctp",
692         .pkt_to_tuple           = sctp_pkt_to_tuple,
693         .invert_tuple           = sctp_invert_tuple,
694         .print_tuple            = sctp_print_tuple,
695         .print_conntrack        = sctp_print_conntrack,
696         .packet                 = sctp_packet,
697         .new                    = sctp_new,
698         .me                     = THIS_MODULE,
699 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
700         .to_nlattr              = sctp_to_nlattr,
701         .nlattr_size            = sctp_nlattr_size,
702         .from_nlattr            = nlattr_to_sctp,
703         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
704         .nlattr_tuple_size      = nf_ct_port_nlattr_tuple_size,
705         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
706         .nla_policy             = nf_ct_port_nla_policy,
707 #endif
708 #ifdef CONFIG_SYSCTL
709         .ctl_table_users        = &sctp_sysctl_table_users,
710         .ctl_table_header       = &sctp_sysctl_header,
711         .ctl_table              = sctp_sysctl_table,
712 #endif
713 };
714
715 static int __init nf_conntrack_proto_sctp_init(void)
716 {
717         int ret;
718
719         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
720         if (ret) {
721                 pr_err("nf_conntrack_l4proto_sctp4: protocol register failed\n");
722                 goto out;
723         }
724         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
725         if (ret) {
726                 pr_err("nf_conntrack_l4proto_sctp6: protocol register failed\n");
727                 goto cleanup_sctp4;
728         }
729
730         return ret;
731
732  cleanup_sctp4:
733         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
734  out:
735         return ret;
736 }
737
738 static void __exit nf_conntrack_proto_sctp_fini(void)
739 {
740         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
741         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
742 }
743
744 module_init(nf_conntrack_proto_sctp_init);
745 module_exit(nf_conntrack_proto_sctp_fini);
746
747 MODULE_LICENSE("GPL");
748 MODULE_AUTHOR("Kiran Kumar Immidi");
749 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
750 MODULE_ALIAS("ip_conntrack_proto_sctp");