Commit | Line | Data |
---|---|---|
9fb9cbb1 YK |
1 | /* |
2 | * Connection tracking protocol helper module for SCTP. | |
601e68e1 | 3 | * |
f229f6ce PM |
4 | * Copyright (c) 2004 Kiran Kumar Immidi <immidi_kiran@yahoo.com> |
5 | * Copyright (c) 2004-2012 Patrick McHardy <kaber@trash.net> | |
6 | * | |
601e68e1 | 7 | * SCTP is defined in RFC 2960. References to various sections in this code |
9fb9cbb1 | 8 | * are to this RFC. |
601e68e1 | 9 | * |
9fb9cbb1 YK |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
9fb9cbb1 YK |
13 | */ |
14 | ||
15 | #include <linux/types.h> | |
9fb9cbb1 YK |
16 | #include <linux/timer.h> |
17 | #include <linux/netfilter.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/sctp.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/seq_file.h> | |
40a839fd YK |
24 | #include <linux/spinlock.h> |
25 | #include <linux/interrupt.h> | |
9fb9cbb1 YK |
26 | |
27 | #include <net/netfilter/nf_conntrack.h> | |
605dcad6 | 28 | #include <net/netfilter/nf_conntrack_l4proto.h> |
f6180121 | 29 | #include <net/netfilter/nf_conntrack_ecache.h> |
9fb9cbb1 | 30 | |
9fb9cbb1 | 31 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more |
601e68e1 | 32 | closely. They're more complex. --RR |
9fb9cbb1 YK |
33 | |
34 | And so for me for SCTP :D -Kiran */ | |
35 | ||
12c33aa2 | 36 | static const char *const sctp_conntrack_names[] = { |
9fb9cbb1 YK |
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 | ||
86c0bf40 PM |
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 | }; | |
9fb9cbb1 YK |
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 | ||
601e68e1 | 72 | /* |
9fb9cbb1 YK |
73 | These are the descriptions of the states: |
74 | ||
601e68e1 | 75 | NOTE: These state names are tantalizingly similar to the states of an |
9fb9cbb1 | 76 | SCTP endpoint. But the interpretation of the states is a little different, |
601e68e1 | 77 | considering that these are the states of the connection and not of an end |
9fb9cbb1 YK |
78 | point. Please note the subtleties. -Kiran |
79 | ||
80 | NONE - Nothing so far. | |
601e68e1 YH |
81 | COOKIE WAIT - We have seen an INIT chunk in the original direction, or also |
82 | an INIT_ACK chunk in the reply direction. | |
9fb9cbb1 YK |
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 | |
601e68e1 YH |
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. | |
9fb9cbb1 YK |
91 | */ |
92 | ||
93 | /* TODO | |
601e68e1 | 94 | - I have assumed that the first INIT is in the original direction. |
9fb9cbb1 YK |
95 | This messes things when an INIT comes in the reply direction in CLOSED |
96 | state. | |
601e68e1 | 97 | - Check the error type in the reply dir before transitioning from |
9fb9cbb1 YK |
98 | cookie echoed to closed. |
99 | - Sec 5.2.4 of RFC 2960 | |
100 | - Multi Homing support. | |
101 | */ | |
102 | ||
103 | /* SCTP conntrack state transitions */ | |
a5e73c29 | 104 | static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = { |
9fb9cbb1 YK |
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}, | |
25985edc | 113 | /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Can't have Stale cookie*/ |
9fb9cbb1 | 114 | /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */ |
25985edc | 115 | /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Can't come in orig dir */ |
9fb9cbb1 YK |
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}, | |
25985edc | 127 | /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Can't come in reply dir */ |
9fb9cbb1 YK |
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 | ||
49d485a3 G |
133 | static int sctp_net_id __read_mostly; |
134 | struct sctp_net { | |
135 | struct nf_proto_net pn; | |
136 | unsigned int timeouts[SCTP_CONNTRACK_MAX]; | |
137 | }; | |
138 | ||
139 | static inline struct sctp_net *sctp_pernet(struct net *net) | |
140 | { | |
141 | return net_generic(net, sctp_net_id); | |
142 | } | |
143 | ||
09f263cd JE |
144 | static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
145 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 146 | { |
12c33aa2 JE |
147 | const struct sctphdr *hp; |
148 | struct sctphdr _hdr; | |
9fb9cbb1 | 149 | |
9fb9cbb1 YK |
150 | /* Actually only need first 8 bytes. */ |
151 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); | |
152 | if (hp == NULL) | |
09f263cd | 153 | return false; |
9fb9cbb1 YK |
154 | |
155 | tuple->src.u.sctp.port = hp->source; | |
156 | tuple->dst.u.sctp.port = hp->dest; | |
09f263cd | 157 | return true; |
9fb9cbb1 YK |
158 | } |
159 | ||
09f263cd JE |
160 | static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple, |
161 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 162 | { |
9fb9cbb1 YK |
163 | tuple->src.u.sctp.port = orig->dst.u.sctp.port; |
164 | tuple->dst.u.sctp.port = orig->src.u.sctp.port; | |
09f263cd | 165 | return true; |
9fb9cbb1 YK |
166 | } |
167 | ||
168 | /* Print out the per-protocol part of the tuple. */ | |
169 | static int sctp_print_tuple(struct seq_file *s, | |
170 | const struct nf_conntrack_tuple *tuple) | |
171 | { | |
9fb9cbb1 YK |
172 | return seq_printf(s, "sport=%hu dport=%hu ", |
173 | ntohs(tuple->src.u.sctp.port), | |
174 | ntohs(tuple->dst.u.sctp.port)); | |
175 | } | |
176 | ||
177 | /* Print out the private part of the conntrack. */ | |
440f0d58 | 178 | static int sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
9fb9cbb1 YK |
179 | { |
180 | enum sctp_conntrack state; | |
181 | ||
440f0d58 | 182 | spin_lock_bh(&ct->lock); |
112f35c9 | 183 | state = ct->proto.sctp.state; |
440f0d58 | 184 | spin_unlock_bh(&ct->lock); |
9fb9cbb1 YK |
185 | |
186 | return seq_printf(s, "%s ", sctp_conntrack_names[state]); | |
187 | } | |
188 | ||
189 | #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \ | |
e79ec50b JE |
190 | for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \ |
191 | (offset) < (skb)->len && \ | |
192 | ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \ | |
193 | (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++) | |
9fb9cbb1 YK |
194 | |
195 | /* Some validity checks to make sure the chunks are fine */ | |
112f35c9 | 196 | static int do_basic_checks(struct nf_conn *ct, |
9fb9cbb1 YK |
197 | const struct sk_buff *skb, |
198 | unsigned int dataoff, | |
35c6d3cb | 199 | unsigned long *map) |
9fb9cbb1 YK |
200 | { |
201 | u_int32_t offset, count; | |
202 | sctp_chunkhdr_t _sch, *sch; | |
203 | int flag; | |
204 | ||
9fb9cbb1 YK |
205 | flag = 0; |
206 | ||
207 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { | |
0d53778e | 208 | pr_debug("Chunk Num: %d Type: %d\n", count, sch->type); |
9fb9cbb1 | 209 | |
5447d477 PM |
210 | if (sch->type == SCTP_CID_INIT || |
211 | sch->type == SCTP_CID_INIT_ACK || | |
212 | sch->type == SCTP_CID_SHUTDOWN_COMPLETE) | |
9fb9cbb1 | 213 | flag = 1; |
9fb9cbb1 | 214 | |
e17df688 PM |
215 | /* |
216 | * Cookie Ack/Echo chunks not the first OR | |
217 | * Init / Init Ack / Shutdown compl chunks not the only chunks | |
218 | * OR zero-length. | |
219 | */ | |
5447d477 PM |
220 | if (((sch->type == SCTP_CID_COOKIE_ACK || |
221 | sch->type == SCTP_CID_COOKIE_ECHO || | |
222 | flag) && | |
223 | count != 0) || !sch->length) { | |
0d53778e | 224 | pr_debug("Basic checks failed\n"); |
9fb9cbb1 YK |
225 | return 1; |
226 | } | |
227 | ||
5447d477 | 228 | if (map) |
35c6d3cb | 229 | set_bit(sch->type, map); |
9fb9cbb1 YK |
230 | } |
231 | ||
0d53778e | 232 | pr_debug("Basic checks passed\n"); |
dd7271fe | 233 | return count == 0; |
9fb9cbb1 YK |
234 | } |
235 | ||
efe9f68a PM |
236 | static int sctp_new_state(enum ip_conntrack_dir dir, |
237 | enum sctp_conntrack cur_state, | |
238 | int chunk_type) | |
9fb9cbb1 YK |
239 | { |
240 | int i; | |
241 | ||
0d53778e | 242 | pr_debug("Chunk type: %d\n", chunk_type); |
9fb9cbb1 YK |
243 | |
244 | switch (chunk_type) { | |
5447d477 PM |
245 | case SCTP_CID_INIT: |
246 | pr_debug("SCTP_CID_INIT\n"); | |
247 | i = 0; | |
248 | break; | |
249 | case SCTP_CID_INIT_ACK: | |
250 | pr_debug("SCTP_CID_INIT_ACK\n"); | |
251 | i = 1; | |
252 | break; | |
253 | case SCTP_CID_ABORT: | |
254 | pr_debug("SCTP_CID_ABORT\n"); | |
255 | i = 2; | |
256 | break; | |
257 | case SCTP_CID_SHUTDOWN: | |
258 | pr_debug("SCTP_CID_SHUTDOWN\n"); | |
259 | i = 3; | |
260 | break; | |
261 | case SCTP_CID_SHUTDOWN_ACK: | |
262 | pr_debug("SCTP_CID_SHUTDOWN_ACK\n"); | |
263 | i = 4; | |
264 | break; | |
265 | case SCTP_CID_ERROR: | |
266 | pr_debug("SCTP_CID_ERROR\n"); | |
267 | i = 5; | |
268 | break; | |
269 | case SCTP_CID_COOKIE_ECHO: | |
270 | pr_debug("SCTP_CID_COOKIE_ECHO\n"); | |
271 | i = 6; | |
272 | break; | |
273 | case SCTP_CID_COOKIE_ACK: | |
274 | pr_debug("SCTP_CID_COOKIE_ACK\n"); | |
275 | i = 7; | |
276 | break; | |
277 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
278 | pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n"); | |
279 | i = 8; | |
280 | break; | |
281 | default: | |
282 | /* Other chunks like DATA, SACK, HEARTBEAT and | |
283 | its ACK do not cause a change in state */ | |
284 | pr_debug("Unknown chunk type, Will stay in %s\n", | |
285 | sctp_conntrack_names[cur_state]); | |
286 | return cur_state; | |
9fb9cbb1 YK |
287 | } |
288 | ||
0d53778e PM |
289 | pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n", |
290 | dir, sctp_conntrack_names[cur_state], chunk_type, | |
291 | sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]); | |
9fb9cbb1 YK |
292 | |
293 | return sctp_conntracks[dir][i][cur_state]; | |
294 | } | |
295 | ||
2c8503f5 PNA |
296 | static unsigned int *sctp_get_timeouts(struct net *net) |
297 | { | |
49d485a3 | 298 | return sctp_pernet(net)->timeouts; |
2c8503f5 PNA |
299 | } |
300 | ||
b37e933a | 301 | /* Returns verdict for packet, or -NF_ACCEPT for invalid. */ |
112f35c9 | 302 | static int sctp_packet(struct nf_conn *ct, |
9fb9cbb1 YK |
303 | const struct sk_buff *skb, |
304 | unsigned int dataoff, | |
305 | enum ip_conntrack_info ctinfo, | |
76108cea | 306 | u_int8_t pf, |
2c8503f5 PNA |
307 | unsigned int hooknum, |
308 | unsigned int *timeouts) | |
9fb9cbb1 | 309 | { |
efe9f68a | 310 | enum sctp_conntrack new_state, old_state; |
8528819a | 311 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
12c33aa2 JE |
312 | const struct sctphdr *sh; |
313 | struct sctphdr _sctph; | |
314 | const struct sctp_chunkhdr *sch; | |
315 | struct sctp_chunkhdr _sch; | |
9fb9cbb1 | 316 | u_int32_t offset, count; |
35c6d3cb | 317 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
9fb9cbb1 | 318 | |
9fb9cbb1 YK |
319 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
320 | if (sh == NULL) | |
b37e933a | 321 | goto out; |
9fb9cbb1 | 322 | |
112f35c9 | 323 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
b37e933a | 324 | goto out; |
9fb9cbb1 YK |
325 | |
326 | /* Check the verification tag (Sec 8.5) */ | |
35c6d3cb PM |
327 | if (!test_bit(SCTP_CID_INIT, map) && |
328 | !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) && | |
329 | !test_bit(SCTP_CID_COOKIE_ECHO, map) && | |
330 | !test_bit(SCTP_CID_ABORT, map) && | |
331 | !test_bit(SCTP_CID_SHUTDOWN_ACK, map) && | |
8528819a | 332 | sh->vtag != ct->proto.sctp.vtag[dir]) { |
0d53778e | 333 | pr_debug("Verification tag check failed\n"); |
b37e933a | 334 | goto out; |
9fb9cbb1 YK |
335 | } |
336 | ||
328bd899 | 337 | old_state = new_state = SCTP_CONNTRACK_NONE; |
440f0d58 | 338 | spin_lock_bh(&ct->lock); |
9fb9cbb1 | 339 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
9fb9cbb1 YK |
340 | /* Special cases of Verification tag check (Sec 8.5.1) */ |
341 | if (sch->type == SCTP_CID_INIT) { | |
342 | /* Sec 8.5.1 (A) */ | |
b37e933a PM |
343 | if (sh->vtag != 0) |
344 | goto out_unlock; | |
9fb9cbb1 YK |
345 | } else if (sch->type == SCTP_CID_ABORT) { |
346 | /* Sec 8.5.1 (B) */ | |
8528819a | 347 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
b37e933a PM |
348 | sh->vtag != ct->proto.sctp.vtag[!dir]) |
349 | goto out_unlock; | |
9fb9cbb1 YK |
350 | } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) { |
351 | /* Sec 8.5.1 (C) */ | |
8528819a PM |
352 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
353 | sh->vtag != ct->proto.sctp.vtag[!dir] && | |
9b1c2cfd | 354 | sch->flags & SCTP_CHUNK_FLAG_T) |
b37e933a | 355 | goto out_unlock; |
9fb9cbb1 YK |
356 | } else if (sch->type == SCTP_CID_COOKIE_ECHO) { |
357 | /* Sec 8.5.1 (D) */ | |
b37e933a PM |
358 | if (sh->vtag != ct->proto.sctp.vtag[dir]) |
359 | goto out_unlock; | |
9fb9cbb1 YK |
360 | } |
361 | ||
efe9f68a PM |
362 | old_state = ct->proto.sctp.state; |
363 | new_state = sctp_new_state(dir, old_state, sch->type); | |
9fb9cbb1 YK |
364 | |
365 | /* Invalid */ | |
efe9f68a | 366 | if (new_state == SCTP_CONNTRACK_MAX) { |
0d53778e PM |
367 | pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u " |
368 | "conntrack=%u\n", | |
efe9f68a | 369 | dir, sch->type, old_state); |
b37e933a | 370 | goto out_unlock; |
9fb9cbb1 YK |
371 | } |
372 | ||
373 | /* If it is an INIT or an INIT ACK note down the vtag */ | |
5447d477 PM |
374 | if (sch->type == SCTP_CID_INIT || |
375 | sch->type == SCTP_CID_INIT_ACK) { | |
9fb9cbb1 YK |
376 | sctp_inithdr_t _inithdr, *ih; |
377 | ||
378 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
601e68e1 | 379 | sizeof(_inithdr), &_inithdr); |
b37e933a PM |
380 | if (ih == NULL) |
381 | goto out_unlock; | |
0d53778e | 382 | pr_debug("Setting vtag %x for dir %d\n", |
8528819a PM |
383 | ih->init_tag, !dir); |
384 | ct->proto.sctp.vtag[!dir] = ih->init_tag; | |
9fb9cbb1 YK |
385 | } |
386 | ||
efe9f68a PM |
387 | ct->proto.sctp.state = new_state; |
388 | if (old_state != new_state) | |
a71996fc | 389 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
9fb9cbb1 | 390 | } |
440f0d58 | 391 | spin_unlock_bh(&ct->lock); |
9fb9cbb1 | 392 | |
2c8503f5 | 393 | nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]); |
9fb9cbb1 | 394 | |
efe9f68a | 395 | if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED && |
8528819a | 396 | dir == IP_CT_DIR_REPLY && |
efe9f68a | 397 | new_state == SCTP_CONNTRACK_ESTABLISHED) { |
0d53778e | 398 | pr_debug("Setting assured bit\n"); |
112f35c9 | 399 | set_bit(IPS_ASSURED_BIT, &ct->status); |
858b3133 | 400 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
9fb9cbb1 YK |
401 | } |
402 | ||
403 | return NF_ACCEPT; | |
b37e933a PM |
404 | |
405 | out_unlock: | |
440f0d58 | 406 | spin_unlock_bh(&ct->lock); |
b37e933a PM |
407 | out: |
408 | return -NF_ACCEPT; | |
9fb9cbb1 YK |
409 | } |
410 | ||
411 | /* Called when a new connection for this protocol found. */ | |
09f263cd | 412 | static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb, |
2c8503f5 | 413 | unsigned int dataoff, unsigned int *timeouts) |
9fb9cbb1 | 414 | { |
efe9f68a | 415 | enum sctp_conntrack new_state; |
12c33aa2 JE |
416 | const struct sctphdr *sh; |
417 | struct sctphdr _sctph; | |
418 | const struct sctp_chunkhdr *sch; | |
419 | struct sctp_chunkhdr _sch; | |
9fb9cbb1 | 420 | u_int32_t offset, count; |
35c6d3cb | 421 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
9fb9cbb1 | 422 | |
9fb9cbb1 YK |
423 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
424 | if (sh == NULL) | |
09f263cd | 425 | return false; |
9fb9cbb1 | 426 | |
112f35c9 | 427 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
09f263cd | 428 | return false; |
9fb9cbb1 YK |
429 | |
430 | /* If an OOTB packet has any of these chunks discard (Sec 8.4) */ | |
35c6d3cb PM |
431 | if (test_bit(SCTP_CID_ABORT, map) || |
432 | test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) || | |
433 | test_bit(SCTP_CID_COOKIE_ACK, map)) | |
09f263cd | 434 | return false; |
9fb9cbb1 | 435 | |
e5fc9e7a | 436 | memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp)); |
efe9f68a | 437 | new_state = SCTP_CONNTRACK_MAX; |
9fb9cbb1 YK |
438 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
439 | /* Don't need lock here: this conntrack not in circulation yet */ | |
efe9f68a PM |
440 | new_state = sctp_new_state(IP_CT_DIR_ORIGINAL, |
441 | SCTP_CONNTRACK_NONE, sch->type); | |
9fb9cbb1 YK |
442 | |
443 | /* Invalid: delete conntrack */ | |
efe9f68a PM |
444 | if (new_state == SCTP_CONNTRACK_NONE || |
445 | new_state == SCTP_CONNTRACK_MAX) { | |
0d53778e | 446 | pr_debug("nf_conntrack_sctp: invalid new deleting.\n"); |
09f263cd | 447 | return false; |
9fb9cbb1 YK |
448 | } |
449 | ||
450 | /* Copy the vtag into the state info */ | |
451 | if (sch->type == SCTP_CID_INIT) { | |
452 | if (sh->vtag == 0) { | |
453 | sctp_inithdr_t _inithdr, *ih; | |
454 | ||
455 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
601e68e1 | 456 | sizeof(_inithdr), &_inithdr); |
9fb9cbb1 | 457 | if (ih == NULL) |
09f263cd | 458 | return false; |
9fb9cbb1 | 459 | |
0d53778e PM |
460 | pr_debug("Setting vtag %x for new conn\n", |
461 | ih->init_tag); | |
9fb9cbb1 | 462 | |
112f35c9 | 463 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
9fb9cbb1 YK |
464 | ih->init_tag; |
465 | } else { | |
466 | /* Sec 8.5.1 (A) */ | |
09f263cd | 467 | return false; |
9fb9cbb1 YK |
468 | } |
469 | } | |
470 | /* If it is a shutdown ack OOTB packet, we expect a return | |
471 | shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */ | |
472 | else { | |
0d53778e PM |
473 | pr_debug("Setting vtag %x for new conn OOTB\n", |
474 | sh->vtag); | |
112f35c9 | 475 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag; |
9fb9cbb1 YK |
476 | } |
477 | ||
efe9f68a | 478 | ct->proto.sctp.state = new_state; |
9fb9cbb1 YK |
479 | } |
480 | ||
09f263cd | 481 | return true; |
9fb9cbb1 YK |
482 | } |
483 | ||
c0cd1156 | 484 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
a258860e PNA |
485 | |
486 | #include <linux/netfilter/nfnetlink.h> | |
487 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
488 | ||
489 | static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, | |
440f0d58 | 490 | struct nf_conn *ct) |
a258860e PNA |
491 | { |
492 | struct nlattr *nest_parms; | |
493 | ||
440f0d58 | 494 | spin_lock_bh(&ct->lock); |
a258860e PNA |
495 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED); |
496 | if (!nest_parms) | |
497 | goto nla_put_failure; | |
498 | ||
5e8d1eb5 DM |
499 | if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state) || |
500 | nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL, | |
501 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) || | |
502 | nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY, | |
503 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY])) | |
504 | goto nla_put_failure; | |
a258860e | 505 | |
440f0d58 | 506 | spin_unlock_bh(&ct->lock); |
a258860e PNA |
507 | |
508 | nla_nest_end(skb, nest_parms); | |
509 | ||
510 | return 0; | |
511 | ||
512 | nla_put_failure: | |
440f0d58 | 513 | spin_unlock_bh(&ct->lock); |
a258860e PNA |
514 | return -1; |
515 | } | |
516 | ||
517 | static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = { | |
518 | [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 }, | |
519 | [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 }, | |
520 | [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 }, | |
521 | }; | |
522 | ||
523 | static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct) | |
524 | { | |
525 | struct nlattr *attr = cda[CTA_PROTOINFO_SCTP]; | |
526 | struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1]; | |
527 | int err; | |
528 | ||
529 | /* updates may not contain the internal protocol info, skip parsing */ | |
530 | if (!attr) | |
531 | return 0; | |
532 | ||
533 | err = nla_parse_nested(tb, | |
534 | CTA_PROTOINFO_SCTP_MAX, | |
535 | attr, | |
536 | sctp_nla_policy); | |
537 | if (err < 0) | |
538 | return err; | |
539 | ||
540 | if (!tb[CTA_PROTOINFO_SCTP_STATE] || | |
541 | !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] || | |
542 | !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]) | |
543 | return -EINVAL; | |
544 | ||
440f0d58 | 545 | spin_lock_bh(&ct->lock); |
a258860e PNA |
546 | ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]); |
547 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = | |
5547cd0a | 548 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]); |
a258860e | 549 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
5547cd0a | 550 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]); |
440f0d58 | 551 | spin_unlock_bh(&ct->lock); |
a258860e PNA |
552 | |
553 | return 0; | |
554 | } | |
a400c30e HE |
555 | |
556 | static int sctp_nlattr_size(void) | |
557 | { | |
558 | return nla_total_size(0) /* CTA_PROTOINFO_SCTP */ | |
559 | + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1); | |
560 | } | |
a258860e PNA |
561 | #endif |
562 | ||
50978462 PNA |
563 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
564 | ||
565 | #include <linux/netfilter/nfnetlink.h> | |
566 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
567 | ||
8264deb8 G |
568 | static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[], |
569 | struct net *net, void *data) | |
50978462 PNA |
570 | { |
571 | unsigned int *timeouts = data; | |
8264deb8 | 572 | struct sctp_net *sn = sctp_pernet(net); |
50978462 PNA |
573 | int i; |
574 | ||
575 | /* set default SCTP timeouts. */ | |
576 | for (i=0; i<SCTP_CONNTRACK_MAX; i++) | |
8264deb8 | 577 | timeouts[i] = sn->timeouts[i]; |
50978462 PNA |
578 | |
579 | /* there's a 1:1 mapping between attributes and protocol states. */ | |
580 | for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) { | |
581 | if (tb[i]) { | |
582 | timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ; | |
583 | } | |
584 | } | |
585 | return 0; | |
586 | } | |
587 | ||
588 | static int | |
589 | sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) | |
590 | { | |
591 | const unsigned int *timeouts = data; | |
592 | int i; | |
593 | ||
5e8d1eb5 DM |
594 | for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) { |
595 | if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ))) | |
596 | goto nla_put_failure; | |
597 | } | |
50978462 PNA |
598 | return 0; |
599 | ||
600 | nla_put_failure: | |
601 | return -ENOSPC; | |
602 | } | |
603 | ||
604 | static const struct nla_policy | |
605 | sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = { | |
606 | [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 }, | |
607 | [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 }, | |
608 | [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 }, | |
609 | [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 }, | |
610 | [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 }, | |
611 | [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 }, | |
612 | [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 }, | |
613 | }; | |
614 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
615 | ||
616 | ||
9fb9cbb1 | 617 | #ifdef CONFIG_SYSCTL |
933a41e7 | 618 | static struct ctl_table sctp_sysctl_table[] = { |
9fb9cbb1 | 619 | { |
9fb9cbb1 | 620 | .procname = "nf_conntrack_sctp_timeout_closed", |
9fb9cbb1 YK |
621 | .maxlen = sizeof(unsigned int), |
622 | .mode = 0644, | |
6d9f239a | 623 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
624 | }, |
625 | { | |
9fb9cbb1 | 626 | .procname = "nf_conntrack_sctp_timeout_cookie_wait", |
9fb9cbb1 YK |
627 | .maxlen = sizeof(unsigned int), |
628 | .mode = 0644, | |
6d9f239a | 629 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
630 | }, |
631 | { | |
9fb9cbb1 | 632 | .procname = "nf_conntrack_sctp_timeout_cookie_echoed", |
9fb9cbb1 YK |
633 | .maxlen = sizeof(unsigned int), |
634 | .mode = 0644, | |
6d9f239a | 635 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
636 | }, |
637 | { | |
9fb9cbb1 | 638 | .procname = "nf_conntrack_sctp_timeout_established", |
9fb9cbb1 YK |
639 | .maxlen = sizeof(unsigned int), |
640 | .mode = 0644, | |
6d9f239a | 641 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
642 | }, |
643 | { | |
9fb9cbb1 | 644 | .procname = "nf_conntrack_sctp_timeout_shutdown_sent", |
9fb9cbb1 YK |
645 | .maxlen = sizeof(unsigned int), |
646 | .mode = 0644, | |
6d9f239a | 647 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
648 | }, |
649 | { | |
9fb9cbb1 | 650 | .procname = "nf_conntrack_sctp_timeout_shutdown_recd", |
9fb9cbb1 YK |
651 | .maxlen = sizeof(unsigned int), |
652 | .mode = 0644, | |
6d9f239a | 653 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
654 | }, |
655 | { | |
9fb9cbb1 | 656 | .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent", |
9fb9cbb1 YK |
657 | .maxlen = sizeof(unsigned int), |
658 | .mode = 0644, | |
6d9f239a | 659 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 | 660 | }, |
f8572d8f | 661 | { } |
9fb9cbb1 | 662 | }; |
a999e683 PM |
663 | |
664 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
665 | static struct ctl_table sctp_compat_sysctl_table[] = { | |
666 | { | |
a999e683 | 667 | .procname = "ip_conntrack_sctp_timeout_closed", |
a999e683 PM |
668 | .maxlen = sizeof(unsigned int), |
669 | .mode = 0644, | |
6d9f239a | 670 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
671 | }, |
672 | { | |
a999e683 | 673 | .procname = "ip_conntrack_sctp_timeout_cookie_wait", |
a999e683 PM |
674 | .maxlen = sizeof(unsigned int), |
675 | .mode = 0644, | |
6d9f239a | 676 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
677 | }, |
678 | { | |
a999e683 | 679 | .procname = "ip_conntrack_sctp_timeout_cookie_echoed", |
a999e683 PM |
680 | .maxlen = sizeof(unsigned int), |
681 | .mode = 0644, | |
6d9f239a | 682 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
683 | }, |
684 | { | |
a999e683 | 685 | .procname = "ip_conntrack_sctp_timeout_established", |
a999e683 PM |
686 | .maxlen = sizeof(unsigned int), |
687 | .mode = 0644, | |
6d9f239a | 688 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
689 | }, |
690 | { | |
a999e683 | 691 | .procname = "ip_conntrack_sctp_timeout_shutdown_sent", |
a999e683 PM |
692 | .maxlen = sizeof(unsigned int), |
693 | .mode = 0644, | |
6d9f239a | 694 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
695 | }, |
696 | { | |
a999e683 | 697 | .procname = "ip_conntrack_sctp_timeout_shutdown_recd", |
a999e683 PM |
698 | .maxlen = sizeof(unsigned int), |
699 | .mode = 0644, | |
6d9f239a | 700 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
701 | }, |
702 | { | |
a999e683 | 703 | .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent", |
a999e683 PM |
704 | .maxlen = sizeof(unsigned int), |
705 | .mode = 0644, | |
6d9f239a | 706 | .proc_handler = proc_dointvec_jiffies, |
a999e683 | 707 | }, |
f8572d8f | 708 | { } |
a999e683 PM |
709 | }; |
710 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
933a41e7 | 711 | #endif |
9fb9cbb1 | 712 | |
f42c4183 G |
713 | static int sctp_kmemdup_sysctl_table(struct nf_proto_net *pn, |
714 | struct sctp_net *sn) | |
49d485a3 G |
715 | { |
716 | #ifdef CONFIG_SYSCTL | |
49d485a3 G |
717 | if (pn->ctl_table) |
718 | return 0; | |
719 | ||
720 | pn->ctl_table = kmemdup(sctp_sysctl_table, | |
721 | sizeof(sctp_sysctl_table), | |
722 | GFP_KERNEL); | |
723 | if (!pn->ctl_table) | |
724 | return -ENOMEM; | |
725 | ||
726 | pn->ctl_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED]; | |
727 | pn->ctl_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT]; | |
728 | pn->ctl_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED]; | |
729 | pn->ctl_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED]; | |
730 | pn->ctl_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT]; | |
731 | pn->ctl_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD]; | |
732 | pn->ctl_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]; | |
733 | #endif | |
734 | return 0; | |
735 | } | |
736 | ||
f42c4183 G |
737 | static int sctp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn, |
738 | struct sctp_net *sn) | |
49d485a3 G |
739 | { |
740 | #ifdef CONFIG_SYSCTL | |
741 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
49d485a3 G |
742 | pn->ctl_compat_table = kmemdup(sctp_compat_sysctl_table, |
743 | sizeof(sctp_compat_sysctl_table), | |
744 | GFP_KERNEL); | |
745 | if (!pn->ctl_compat_table) | |
746 | return -ENOMEM; | |
747 | ||
748 | pn->ctl_compat_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED]; | |
749 | pn->ctl_compat_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT]; | |
750 | pn->ctl_compat_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED]; | |
751 | pn->ctl_compat_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED]; | |
752 | pn->ctl_compat_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT]; | |
753 | pn->ctl_compat_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD]; | |
754 | pn->ctl_compat_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]; | |
755 | #endif | |
756 | #endif | |
757 | return 0; | |
758 | } | |
759 | ||
f42c4183 | 760 | static int sctp_init_net(struct net *net, u_int16_t proto) |
49d485a3 G |
761 | { |
762 | int ret; | |
763 | struct sctp_net *sn = sctp_pernet(net); | |
f42c4183 | 764 | struct nf_proto_net *pn = &sn->pn; |
49d485a3 | 765 | |
f42c4183 G |
766 | if (!pn->users) { |
767 | int i; | |
49d485a3 | 768 | |
f42c4183 G |
769 | for (i = 0; i < SCTP_CONNTRACK_MAX; i++) |
770 | sn->timeouts[i] = sctp_timeouts[i]; | |
771 | } | |
49d485a3 | 772 | |
f42c4183 G |
773 | if (proto == AF_INET) { |
774 | ret = sctp_kmemdup_compat_sysctl_table(pn, sn); | |
775 | if (ret < 0) | |
776 | return ret; | |
49d485a3 | 777 | |
f42c4183 G |
778 | ret = sctp_kmemdup_sysctl_table(pn, sn); |
779 | if (ret < 0) | |
780 | nf_ct_kfree_compat_sysctl_table(pn); | |
781 | } else | |
782 | ret = sctp_kmemdup_sysctl_table(pn, sn); | |
49d485a3 | 783 | |
49d485a3 G |
784 | return ret; |
785 | } | |
786 | ||
61075af5 | 787 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = { |
933a41e7 PM |
788 | .l3proto = PF_INET, |
789 | .l4proto = IPPROTO_SCTP, | |
790 | .name = "sctp", | |
791 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
792 | .invert_tuple = sctp_invert_tuple, | |
793 | .print_tuple = sctp_print_tuple, | |
794 | .print_conntrack = sctp_print_conntrack, | |
795 | .packet = sctp_packet, | |
2c8503f5 | 796 | .get_timeouts = sctp_get_timeouts, |
933a41e7 PM |
797 | .new = sctp_new, |
798 | .me = THIS_MODULE, | |
c0cd1156 | 799 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
a258860e | 800 | .to_nlattr = sctp_to_nlattr, |
a400c30e | 801 | .nlattr_size = sctp_nlattr_size, |
a258860e | 802 | .from_nlattr = nlattr_to_sctp, |
c7212e9d | 803 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
a400c30e | 804 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
c7212e9d PNA |
805 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
806 | .nla_policy = nf_ct_port_nla_policy, | |
807 | #endif | |
50978462 PNA |
808 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
809 | .ctnl_timeout = { | |
810 | .nlattr_to_obj = sctp_timeout_nlattr_to_obj, | |
811 | .obj_to_nlattr = sctp_timeout_obj_to_nlattr, | |
812 | .nlattr_max = CTA_TIMEOUT_SCTP_MAX, | |
813 | .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX, | |
814 | .nla_policy = sctp_timeout_nla_policy, | |
815 | }, | |
816 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
49d485a3 | 817 | .net_id = &sctp_net_id, |
f42c4183 | 818 | .init_net = sctp_init_net, |
9fb9cbb1 YK |
819 | }; |
820 | ||
61075af5 | 821 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = { |
933a41e7 PM |
822 | .l3proto = PF_INET6, |
823 | .l4proto = IPPROTO_SCTP, | |
824 | .name = "sctp", | |
825 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
826 | .invert_tuple = sctp_invert_tuple, | |
827 | .print_tuple = sctp_print_tuple, | |
828 | .print_conntrack = sctp_print_conntrack, | |
829 | .packet = sctp_packet, | |
2c8503f5 | 830 | .get_timeouts = sctp_get_timeouts, |
933a41e7 PM |
831 | .new = sctp_new, |
832 | .me = THIS_MODULE, | |
c0cd1156 | 833 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
a258860e | 834 | .to_nlattr = sctp_to_nlattr, |
a400c30e | 835 | .nlattr_size = sctp_nlattr_size, |
a258860e | 836 | .from_nlattr = nlattr_to_sctp, |
c7212e9d | 837 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
a400c30e | 838 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
c7212e9d PNA |
839 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
840 | .nla_policy = nf_ct_port_nla_policy, | |
50978462 PNA |
841 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
842 | .ctnl_timeout = { | |
843 | .nlattr_to_obj = sctp_timeout_nlattr_to_obj, | |
844 | .obj_to_nlattr = sctp_timeout_obj_to_nlattr, | |
845 | .nlattr_max = CTA_TIMEOUT_SCTP_MAX, | |
846 | .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX, | |
847 | .nla_policy = sctp_timeout_nla_policy, | |
848 | }, | |
849 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
9fb9cbb1 | 850 | #endif |
49d485a3 | 851 | .net_id = &sctp_net_id, |
f42c4183 | 852 | .init_net = sctp_init_net, |
933a41e7 | 853 | }; |
9fb9cbb1 | 854 | |
49d485a3 | 855 | static int sctp_net_init(struct net *net) |
9fb9cbb1 | 856 | { |
49d485a3 | 857 | int ret = 0; |
9fb9cbb1 | 858 | |
c296bb4d | 859 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_sctp4); |
49d485a3 | 860 | if (ret < 0) { |
c296bb4d | 861 | pr_err("nf_conntrack_sctp4: pernet registration failed.\n"); |
9fb9cbb1 YK |
862 | goto out; |
863 | } | |
c296bb4d | 864 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_sctp6); |
49d485a3 | 865 | if (ret < 0) { |
c296bb4d | 866 | pr_err("nf_conntrack_sctp6: pernet registration failed.\n"); |
9fb9cbb1 YK |
867 | goto cleanup_sctp4; |
868 | } | |
49d485a3 | 869 | return 0; |
9fb9cbb1 | 870 | |
49d485a3 | 871 | cleanup_sctp4: |
c296bb4d | 872 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp4); |
49d485a3 | 873 | out: |
9fb9cbb1 | 874 | return ret; |
49d485a3 | 875 | } |
9fb9cbb1 | 876 | |
49d485a3 G |
877 | static void sctp_net_exit(struct net *net) |
878 | { | |
c296bb4d G |
879 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp6); |
880 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp4); | |
49d485a3 G |
881 | } |
882 | ||
883 | static struct pernet_operations sctp_net_ops = { | |
884 | .init = sctp_net_init, | |
885 | .exit = sctp_net_exit, | |
886 | .id = &sctp_net_id, | |
887 | .size = sizeof(struct sctp_net), | |
888 | }; | |
889 | ||
890 | static int __init nf_conntrack_proto_sctp_init(void) | |
891 | { | |
c296bb4d G |
892 | int ret; |
893 | ||
0d98da5d G |
894 | ret = register_pernet_subsys(&sctp_net_ops); |
895 | if (ret < 0) | |
896 | goto out_pernet; | |
897 | ||
c296bb4d G |
898 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp4); |
899 | if (ret < 0) | |
900 | goto out_sctp4; | |
901 | ||
902 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp6); | |
903 | if (ret < 0) | |
904 | goto out_sctp6; | |
905 | ||
c296bb4d | 906 | return 0; |
c296bb4d G |
907 | out_sctp6: |
908 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4); | |
909 | out_sctp4: | |
0d98da5d G |
910 | unregister_pernet_subsys(&sctp_net_ops); |
911 | out_pernet: | |
c296bb4d | 912 | return ret; |
9fb9cbb1 YK |
913 | } |
914 | ||
2f0d2f10 | 915 | static void __exit nf_conntrack_proto_sctp_fini(void) |
9fb9cbb1 | 916 | { |
c296bb4d G |
917 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp6); |
918 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4); | |
49d485a3 | 919 | unregister_pernet_subsys(&sctp_net_ops); |
9fb9cbb1 YK |
920 | } |
921 | ||
65b4b4e8 AM |
922 | module_init(nf_conntrack_proto_sctp_init); |
923 | module_exit(nf_conntrack_proto_sctp_fini); | |
9fb9cbb1 YK |
924 | |
925 | MODULE_LICENSE("GPL"); | |
926 | MODULE_AUTHOR("Kiran Kumar Immidi"); | |
927 | MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP"); | |
d2483dde | 928 | MODULE_ALIAS("ip_conntrack_proto_sctp"); |