netfilter: nf_conntrack: calculate per-protocol nlattr size
[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 ct->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 *const 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 sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = {
53         [SCTP_CONNTRACK_CLOSED]                 = 10 SECS,
54         [SCTP_CONNTRACK_COOKIE_WAIT]            = 3 SECS,
55         [SCTP_CONNTRACK_COOKIE_ECHOED]          = 3 SECS,
56         [SCTP_CONNTRACK_ESTABLISHED]            = 5 DAYS,
57         [SCTP_CONNTRACK_SHUTDOWN_SENT]          = 300 SECS / 1000,
58         [SCTP_CONNTRACK_SHUTDOWN_RECD]          = 300 SECS / 1000,
59         [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]      = 3 SECS,
60 };
61
62 #define sNO SCTP_CONNTRACK_NONE
63 #define sCL SCTP_CONNTRACK_CLOSED
64 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
65 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
66 #define sES SCTP_CONNTRACK_ESTABLISHED
67 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
68 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
69 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
70 #define sIV SCTP_CONNTRACK_MAX
71
72 /*
73         These are the descriptions of the states:
74
75 NOTE: These state names are tantalizingly similar to the states of an
76 SCTP endpoint. But the interpretation of the states is a little different,
77 considering that these are the states of the connection and not of an end
78 point. Please note the subtleties. -Kiran
79
80 NONE              - Nothing so far.
81 COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
82                     an INIT_ACK chunk in the reply direction.
83 COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
84 ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
85 SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
86 SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
87 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
88                     to that of the SHUTDOWN chunk.
89 CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
90                     the SHUTDOWN chunk. Connection is closed.
91 */
92
93 /* TODO
94  - I have assumed that the first INIT is in the original direction.
95  This messes things when an INIT comes in the reply direction in CLOSED
96  state.
97  - Check the error type in the reply dir before transitioning from
98 cookie echoed to closed.
99  - Sec 5.2.4 of RFC 2960
100  - Multi Homing support.
101 */
102
103 /* SCTP conntrack state transitions */
104 static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
105         {
106 /*      ORIGINAL        */
107 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
108 /* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
109 /* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
110 /* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
111 /* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
112 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
113 /* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
114 /* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
115 /* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
116 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
117         },
118         {
119 /*      REPLY   */
120 /*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
121 /* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
122 /* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
123 /* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
124 /* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
125 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
126 /* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
127 /* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
128 /* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
129 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
130         }
131 };
132
133 static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
134                               struct nf_conntrack_tuple *tuple)
135 {
136         const struct sctphdr *hp;
137         struct sctphdr _hdr;
138
139         /* Actually only need first 8 bytes. */
140         hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
141         if (hp == NULL)
142                 return false;
143
144         tuple->src.u.sctp.port = hp->source;
145         tuple->dst.u.sctp.port = hp->dest;
146         return true;
147 }
148
149 static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
150                               const struct nf_conntrack_tuple *orig)
151 {
152         tuple->src.u.sctp.port = orig->dst.u.sctp.port;
153         tuple->dst.u.sctp.port = orig->src.u.sctp.port;
154         return true;
155 }
156
157 /* Print out the per-protocol part of the tuple. */
158 static int sctp_print_tuple(struct seq_file *s,
159                             const struct nf_conntrack_tuple *tuple)
160 {
161         return seq_printf(s, "sport=%hu dport=%hu ",
162                           ntohs(tuple->src.u.sctp.port),
163                           ntohs(tuple->dst.u.sctp.port));
164 }
165
166 /* Print out the private part of the conntrack. */
167 static int sctp_print_conntrack(struct seq_file *s, const struct nf_conn *ct)
168 {
169         enum sctp_conntrack state;
170
171         read_lock_bh(&sctp_lock);
172         state = ct->proto.sctp.state;
173         read_unlock_bh(&sctp_lock);
174
175         return seq_printf(s, "%s ", sctp_conntrack_names[state]);
176 }
177
178 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)     \
179 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0;        \
180         (offset) < (skb)->len &&                                        \
181         ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch)));   \
182         (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
183
184 /* Some validity checks to make sure the chunks are fine */
185 static int do_basic_checks(struct nf_conn *ct,
186                            const struct sk_buff *skb,
187                            unsigned int dataoff,
188                            unsigned long *map)
189 {
190         u_int32_t offset, count;
191         sctp_chunkhdr_t _sch, *sch;
192         int flag;
193
194         flag = 0;
195
196         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
197                 pr_debug("Chunk Num: %d  Type: %d\n", count, sch->type);
198
199                 if (sch->type == SCTP_CID_INIT ||
200                     sch->type == SCTP_CID_INIT_ACK ||
201                     sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
202                         flag = 1;
203
204                 /*
205                  * Cookie Ack/Echo chunks not the first OR
206                  * Init / Init Ack / Shutdown compl chunks not the only chunks
207                  * OR zero-length.
208                  */
209                 if (((sch->type == SCTP_CID_COOKIE_ACK ||
210                       sch->type == SCTP_CID_COOKIE_ECHO ||
211                       flag) &&
212                      count != 0) || !sch->length) {
213                         pr_debug("Basic checks failed\n");
214                         return 1;
215                 }
216
217                 if (map)
218                         set_bit(sch->type, map);
219         }
220
221         pr_debug("Basic checks passed\n");
222         return count == 0;
223 }
224
225 static int sctp_new_state(enum ip_conntrack_dir dir,
226                           enum sctp_conntrack cur_state,
227                           int chunk_type)
228 {
229         int i;
230
231         pr_debug("Chunk type: %d\n", chunk_type);
232
233         switch (chunk_type) {
234         case SCTP_CID_INIT:
235                 pr_debug("SCTP_CID_INIT\n");
236                 i = 0;
237                 break;
238         case SCTP_CID_INIT_ACK:
239                 pr_debug("SCTP_CID_INIT_ACK\n");
240                 i = 1;
241                 break;
242         case SCTP_CID_ABORT:
243                 pr_debug("SCTP_CID_ABORT\n");
244                 i = 2;
245                 break;
246         case SCTP_CID_SHUTDOWN:
247                 pr_debug("SCTP_CID_SHUTDOWN\n");
248                 i = 3;
249                 break;
250         case SCTP_CID_SHUTDOWN_ACK:
251                 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
252                 i = 4;
253                 break;
254         case SCTP_CID_ERROR:
255                 pr_debug("SCTP_CID_ERROR\n");
256                 i = 5;
257                 break;
258         case SCTP_CID_COOKIE_ECHO:
259                 pr_debug("SCTP_CID_COOKIE_ECHO\n");
260                 i = 6;
261                 break;
262         case SCTP_CID_COOKIE_ACK:
263                 pr_debug("SCTP_CID_COOKIE_ACK\n");
264                 i = 7;
265                 break;
266         case SCTP_CID_SHUTDOWN_COMPLETE:
267                 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
268                 i = 8;
269                 break;
270         default:
271                 /* Other chunks like DATA, SACK, HEARTBEAT and
272                 its ACK do not cause a change in state */
273                 pr_debug("Unknown chunk type, Will stay in %s\n",
274                          sctp_conntrack_names[cur_state]);
275                 return cur_state;
276         }
277
278         pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
279                  dir, sctp_conntrack_names[cur_state], chunk_type,
280                  sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
281
282         return sctp_conntracks[dir][i][cur_state];
283 }
284
285 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
286 static int sctp_packet(struct nf_conn *ct,
287                        const struct sk_buff *skb,
288                        unsigned int dataoff,
289                        enum ip_conntrack_info ctinfo,
290                        u_int8_t pf,
291                        unsigned int hooknum)
292 {
293         enum sctp_conntrack new_state, old_state;
294         enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
295         const struct sctphdr *sh;
296         struct sctphdr _sctph;
297         const struct sctp_chunkhdr *sch;
298         struct sctp_chunkhdr _sch;
299         u_int32_t offset, count;
300         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
301
302         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
303         if (sh == NULL)
304                 goto out;
305
306         if (do_basic_checks(ct, skb, dataoff, map) != 0)
307                 goto out;
308
309         /* Check the verification tag (Sec 8.5) */
310         if (!test_bit(SCTP_CID_INIT, map) &&
311             !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
312             !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
313             !test_bit(SCTP_CID_ABORT, map) &&
314             !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
315             sh->vtag != ct->proto.sctp.vtag[dir]) {
316                 pr_debug("Verification tag check failed\n");
317                 goto out;
318         }
319
320         old_state = new_state = SCTP_CONNTRACK_NONE;
321         write_lock_bh(&sctp_lock);
322         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
323                 /* Special cases of Verification tag check (Sec 8.5.1) */
324                 if (sch->type == SCTP_CID_INIT) {
325                         /* Sec 8.5.1 (A) */
326                         if (sh->vtag != 0)
327                                 goto out_unlock;
328                 } else if (sch->type == SCTP_CID_ABORT) {
329                         /* Sec 8.5.1 (B) */
330                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
331                             sh->vtag != ct->proto.sctp.vtag[!dir])
332                                 goto out_unlock;
333                 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
334                         /* Sec 8.5.1 (C) */
335                         if (sh->vtag != ct->proto.sctp.vtag[dir] &&
336                             sh->vtag != ct->proto.sctp.vtag[!dir] &&
337                             sch->flags & SCTP_CHUNK_FLAG_T)
338                                 goto out_unlock;
339                 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
340                         /* Sec 8.5.1 (D) */
341                         if (sh->vtag != ct->proto.sctp.vtag[dir])
342                                 goto out_unlock;
343                 }
344
345                 old_state = ct->proto.sctp.state;
346                 new_state = sctp_new_state(dir, old_state, sch->type);
347
348                 /* Invalid */
349                 if (new_state == SCTP_CONNTRACK_MAX) {
350                         pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
351                                  "conntrack=%u\n",
352                                  dir, sch->type, old_state);
353                         goto out_unlock;
354                 }
355
356                 /* If it is an INIT or an INIT ACK note down the vtag */
357                 if (sch->type == SCTP_CID_INIT ||
358                     sch->type == SCTP_CID_INIT_ACK) {
359                         sctp_inithdr_t _inithdr, *ih;
360
361                         ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
362                                                 sizeof(_inithdr), &_inithdr);
363                         if (ih == NULL)
364                                 goto out_unlock;
365                         pr_debug("Setting vtag %x for dir %d\n",
366                                  ih->init_tag, !dir);
367                         ct->proto.sctp.vtag[!dir] = ih->init_tag;
368                 }
369
370                 ct->proto.sctp.state = new_state;
371                 if (old_state != new_state)
372                         nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
373         }
374         write_unlock_bh(&sctp_lock);
375
376         nf_ct_refresh_acct(ct, ctinfo, skb, sctp_timeouts[new_state]);
377
378         if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
379             dir == IP_CT_DIR_REPLY &&
380             new_state == SCTP_CONNTRACK_ESTABLISHED) {
381                 pr_debug("Setting assured bit\n");
382                 set_bit(IPS_ASSURED_BIT, &ct->status);
383                 nf_conntrack_event_cache(IPCT_STATUS, ct);
384         }
385
386         return NF_ACCEPT;
387
388 out_unlock:
389         write_unlock_bh(&sctp_lock);
390 out:
391         return -NF_ACCEPT;
392 }
393
394 /* Called when a new connection for this protocol found. */
395 static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
396                      unsigned int dataoff)
397 {
398         enum sctp_conntrack new_state;
399         const struct sctphdr *sh;
400         struct sctphdr _sctph;
401         const struct sctp_chunkhdr *sch;
402         struct sctp_chunkhdr _sch;
403         u_int32_t offset, count;
404         unsigned long map[256 / sizeof(unsigned long)] = { 0 };
405
406         sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
407         if (sh == NULL)
408                 return false;
409
410         if (do_basic_checks(ct, skb, dataoff, map) != 0)
411                 return false;
412
413         /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
414         if (test_bit(SCTP_CID_ABORT, map) ||
415             test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
416             test_bit(SCTP_CID_COOKIE_ACK, map))
417                 return false;
418
419         new_state = SCTP_CONNTRACK_MAX;
420         for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
421                 /* Don't need lock here: this conntrack not in circulation yet */
422                 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
423                                            SCTP_CONNTRACK_NONE, sch->type);
424
425                 /* Invalid: delete conntrack */
426                 if (new_state == SCTP_CONNTRACK_NONE ||
427                     new_state == SCTP_CONNTRACK_MAX) {
428                         pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
429                         return false;
430                 }
431
432                 /* Copy the vtag into the state info */
433                 if (sch->type == SCTP_CID_INIT) {
434                         if (sh->vtag == 0) {
435                                 sctp_inithdr_t _inithdr, *ih;
436
437                                 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
438                                                         sizeof(_inithdr), &_inithdr);
439                                 if (ih == NULL)
440                                         return false;
441
442                                 pr_debug("Setting vtag %x for new conn\n",
443                                          ih->init_tag);
444
445                                 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
446                                                                 ih->init_tag;
447                         } else {
448                                 /* Sec 8.5.1 (A) */
449                                 return false;
450                         }
451                 }
452                 /* If it is a shutdown ack OOTB packet, we expect a return
453                    shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
454                 else {
455                         pr_debug("Setting vtag %x for new conn OOTB\n",
456                                  sh->vtag);
457                         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
458                 }
459
460                 ct->proto.sctp.state = new_state;
461         }
462
463         return true;
464 }
465
466 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
467
468 #include <linux/netfilter/nfnetlink.h>
469 #include <linux/netfilter/nfnetlink_conntrack.h>
470
471 static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
472                           const struct nf_conn *ct)
473 {
474         struct nlattr *nest_parms;
475
476         read_lock_bh(&sctp_lock);
477         nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED);
478         if (!nest_parms)
479                 goto nla_put_failure;
480
481         NLA_PUT_U8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state);
482
483         NLA_PUT_BE32(skb,
484                      CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
485                      ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]);
486
487         NLA_PUT_BE32(skb,
488                      CTA_PROTOINFO_SCTP_VTAG_REPLY,
489                      ct->proto.sctp.vtag[IP_CT_DIR_REPLY]);
490
491         read_unlock_bh(&sctp_lock);
492
493         nla_nest_end(skb, nest_parms);
494
495         return 0;
496
497 nla_put_failure:
498         read_unlock_bh(&sctp_lock);
499         return -1;
500 }
501
502 static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
503         [CTA_PROTOINFO_SCTP_STATE]          = { .type = NLA_U8 },
504         [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]  = { .type = NLA_U32 },
505         [CTA_PROTOINFO_SCTP_VTAG_REPLY]     = { .type = NLA_U32 },
506 };
507
508 static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
509 {
510         struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
511         struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1];
512         int err;
513
514         /* updates may not contain the internal protocol info, skip parsing */
515         if (!attr)
516                 return 0;
517
518         err = nla_parse_nested(tb,
519                                CTA_PROTOINFO_SCTP_MAX,
520                                attr,
521                                sctp_nla_policy);
522         if (err < 0)
523                 return err;
524
525         if (!tb[CTA_PROTOINFO_SCTP_STATE] ||
526             !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] ||
527             !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY])
528                 return -EINVAL;
529
530         write_lock_bh(&sctp_lock);
531         ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]);
532         ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] =
533                 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]);
534         ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
535                 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]);
536         write_unlock_bh(&sctp_lock);
537
538         return 0;
539 }
540
541 static int sctp_nlattr_size(void)
542 {
543         return nla_total_size(0)        /* CTA_PROTOINFO_SCTP */
544                 + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1);
545 }
546 #endif
547
548 #ifdef CONFIG_SYSCTL
549 static unsigned int sctp_sysctl_table_users;
550 static struct ctl_table_header *sctp_sysctl_header;
551 static struct ctl_table sctp_sysctl_table[] = {
552         {
553                 .procname       = "nf_conntrack_sctp_timeout_closed",
554                 .data           = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
555                 .maxlen         = sizeof(unsigned int),
556                 .mode           = 0644,
557                 .proc_handler   = proc_dointvec_jiffies,
558         },
559         {
560                 .procname       = "nf_conntrack_sctp_timeout_cookie_wait",
561                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
562                 .maxlen         = sizeof(unsigned int),
563                 .mode           = 0644,
564                 .proc_handler   = proc_dointvec_jiffies,
565         },
566         {
567                 .procname       = "nf_conntrack_sctp_timeout_cookie_echoed",
568                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
569                 .maxlen         = sizeof(unsigned int),
570                 .mode           = 0644,
571                 .proc_handler   = proc_dointvec_jiffies,
572         },
573         {
574                 .procname       = "nf_conntrack_sctp_timeout_established",
575                 .data           = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
576                 .maxlen         = sizeof(unsigned int),
577                 .mode           = 0644,
578                 .proc_handler   = proc_dointvec_jiffies,
579         },
580         {
581                 .procname       = "nf_conntrack_sctp_timeout_shutdown_sent",
582                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
583                 .maxlen         = sizeof(unsigned int),
584                 .mode           = 0644,
585                 .proc_handler   = proc_dointvec_jiffies,
586         },
587         {
588                 .procname       = "nf_conntrack_sctp_timeout_shutdown_recd",
589                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
590                 .maxlen         = sizeof(unsigned int),
591                 .mode           = 0644,
592                 .proc_handler   = proc_dointvec_jiffies,
593         },
594         {
595                 .procname       = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
596                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
597                 .maxlen         = sizeof(unsigned int),
598                 .mode           = 0644,
599                 .proc_handler   = proc_dointvec_jiffies,
600         },
601         {
602                 .ctl_name = 0
603         }
604 };
605
606 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
607 static struct ctl_table sctp_compat_sysctl_table[] = {
608         {
609                 .procname       = "ip_conntrack_sctp_timeout_closed",
610                 .data           = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
611                 .maxlen         = sizeof(unsigned int),
612                 .mode           = 0644,
613                 .proc_handler   = proc_dointvec_jiffies,
614         },
615         {
616                 .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
617                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
618                 .maxlen         = sizeof(unsigned int),
619                 .mode           = 0644,
620                 .proc_handler   = proc_dointvec_jiffies,
621         },
622         {
623                 .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
624                 .data           = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
625                 .maxlen         = sizeof(unsigned int),
626                 .mode           = 0644,
627                 .proc_handler   = proc_dointvec_jiffies,
628         },
629         {
630                 .procname       = "ip_conntrack_sctp_timeout_established",
631                 .data           = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
632                 .maxlen         = sizeof(unsigned int),
633                 .mode           = 0644,
634                 .proc_handler   = proc_dointvec_jiffies,
635         },
636         {
637                 .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
638                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
639                 .maxlen         = sizeof(unsigned int),
640                 .mode           = 0644,
641                 .proc_handler   = proc_dointvec_jiffies,
642         },
643         {
644                 .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
645                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
646                 .maxlen         = sizeof(unsigned int),
647                 .mode           = 0644,
648                 .proc_handler   = proc_dointvec_jiffies,
649         },
650         {
651                 .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
652                 .data           = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
653                 .maxlen         = sizeof(unsigned int),
654                 .mode           = 0644,
655                 .proc_handler   = proc_dointvec_jiffies,
656         },
657         {
658                 .ctl_name = 0
659         }
660 };
661 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
662 #endif
663
664 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
665         .l3proto                = PF_INET,
666         .l4proto                = IPPROTO_SCTP,
667         .name                   = "sctp",
668         .pkt_to_tuple           = sctp_pkt_to_tuple,
669         .invert_tuple           = sctp_invert_tuple,
670         .print_tuple            = sctp_print_tuple,
671         .print_conntrack        = sctp_print_conntrack,
672         .packet                 = sctp_packet,
673         .new                    = sctp_new,
674         .me                     = THIS_MODULE,
675 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
676         .to_nlattr              = sctp_to_nlattr,
677         .nlattr_size            = sctp_nlattr_size,
678         .from_nlattr            = nlattr_to_sctp,
679         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
680         .nlattr_tuple_size      = nf_ct_port_nlattr_tuple_size,
681         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
682         .nla_policy             = nf_ct_port_nla_policy,
683 #endif
684 #ifdef CONFIG_SYSCTL
685         .ctl_table_users        = &sctp_sysctl_table_users,
686         .ctl_table_header       = &sctp_sysctl_header,
687         .ctl_table              = sctp_sysctl_table,
688 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
689         .ctl_compat_table       = sctp_compat_sysctl_table,
690 #endif
691 #endif
692 };
693
694 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
695         .l3proto                = PF_INET6,
696         .l4proto                = IPPROTO_SCTP,
697         .name                   = "sctp",
698         .pkt_to_tuple           = sctp_pkt_to_tuple,
699         .invert_tuple           = sctp_invert_tuple,
700         .print_tuple            = sctp_print_tuple,
701         .print_conntrack        = sctp_print_conntrack,
702         .packet                 = sctp_packet,
703         .new                    = sctp_new,
704         .me                     = THIS_MODULE,
705 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
706         .to_nlattr              = sctp_to_nlattr,
707         .nlattr_size            = sctp_nlattr_size,
708         .from_nlattr            = nlattr_to_sctp,
709         .tuple_to_nlattr        = nf_ct_port_tuple_to_nlattr,
710         .nlattr_tuple_size      = nf_ct_port_nlattr_tuple_size,
711         .nlattr_to_tuple        = nf_ct_port_nlattr_to_tuple,
712         .nla_policy             = nf_ct_port_nla_policy,
713 #endif
714 #ifdef CONFIG_SYSCTL
715         .ctl_table_users        = &sctp_sysctl_table_users,
716         .ctl_table_header       = &sctp_sysctl_header,
717         .ctl_table              = sctp_sysctl_table,
718 #endif
719 };
720
721 static int __init nf_conntrack_proto_sctp_init(void)
722 {
723         int ret;
724
725         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
726         if (ret) {
727                 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
728                 goto out;
729         }
730         ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
731         if (ret) {
732                 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
733                 goto cleanup_sctp4;
734         }
735
736         return ret;
737
738  cleanup_sctp4:
739         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
740  out:
741         return ret;
742 }
743
744 static void __exit nf_conntrack_proto_sctp_fini(void)
745 {
746         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
747         nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
748 }
749
750 module_init(nf_conntrack_proto_sctp_init);
751 module_exit(nf_conntrack_proto_sctp_fini);
752
753 MODULE_LICENSE("GPL");
754 MODULE_AUTHOR("Kiran Kumar Immidi");
755 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
756 MODULE_ALIAS("ip_conntrack_proto_sctp");