]>
Commit | Line | Data |
---|---|---|
9fb9cbb1 YK |
1 | /* |
2 | * Connection tracking protocol helper module for SCTP. | |
601e68e1 YH |
3 | * |
4 | * SCTP is defined in RFC 2960. References to various sections in this code | |
9fb9cbb1 | 5 | * are to this RFC. |
601e68e1 | 6 | * |
9fb9cbb1 YK |
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. | |
9fb9cbb1 YK |
10 | */ |
11 | ||
12 | #include <linux/types.h> | |
9fb9cbb1 YK |
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> | |
40a839fd YK |
21 | #include <linux/spinlock.h> |
22 | #include <linux/interrupt.h> | |
9fb9cbb1 YK |
23 | |
24 | #include <net/netfilter/nf_conntrack.h> | |
605dcad6 | 25 | #include <net/netfilter/nf_conntrack_l4proto.h> |
f6180121 | 26 | #include <net/netfilter/nf_conntrack_ecache.h> |
9fb9cbb1 | 27 | |
9fb9cbb1 | 28 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more |
601e68e1 | 29 | closely. They're more complex. --RR |
9fb9cbb1 YK |
30 | |
31 | And so for me for SCTP :D -Kiran */ | |
32 | ||
12c33aa2 | 33 | static const char *const sctp_conntrack_names[] = { |
9fb9cbb1 YK |
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 | ||
86c0bf40 PM |
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 | }; | |
9fb9cbb1 YK |
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 | ||
601e68e1 | 69 | /* |
9fb9cbb1 YK |
70 | These are the descriptions of the states: |
71 | ||
601e68e1 | 72 | NOTE: These state names are tantalizingly similar to the states of an |
9fb9cbb1 | 73 | SCTP endpoint. But the interpretation of the states is a little different, |
601e68e1 | 74 | considering that these are the states of the connection and not of an end |
9fb9cbb1 YK |
75 | point. Please note the subtleties. -Kiran |
76 | ||
77 | NONE - Nothing so far. | |
601e68e1 YH |
78 | COOKIE WAIT - We have seen an INIT chunk in the original direction, or also |
79 | an INIT_ACK chunk in the reply direction. | |
9fb9cbb1 YK |
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 | |
601e68e1 YH |
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. | |
9fb9cbb1 YK |
88 | */ |
89 | ||
90 | /* TODO | |
601e68e1 | 91 | - I have assumed that the first INIT is in the original direction. |
9fb9cbb1 YK |
92 | This messes things when an INIT comes in the reply direction in CLOSED |
93 | state. | |
601e68e1 | 94 | - Check the error type in the reply dir before transitioning from |
9fb9cbb1 YK |
95 | cookie echoed to closed. |
96 | - Sec 5.2.4 of RFC 2960 | |
97 | - Multi Homing support. | |
98 | */ | |
99 | ||
100 | /* SCTP conntrack state transitions */ | |
a5e73c29 | 101 | static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = { |
9fb9cbb1 YK |
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}, | |
25985edc | 110 | /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Can't have Stale cookie*/ |
9fb9cbb1 | 111 | /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */ |
25985edc | 112 | /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Can't come in orig dir */ |
9fb9cbb1 YK |
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}, | |
25985edc | 124 | /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Can't come in reply dir */ |
9fb9cbb1 YK |
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 | ||
49d485a3 G |
130 | static int sctp_net_id __read_mostly; |
131 | struct sctp_net { | |
132 | struct nf_proto_net pn; | |
133 | unsigned int timeouts[SCTP_CONNTRACK_MAX]; | |
134 | }; | |
135 | ||
136 | static inline struct sctp_net *sctp_pernet(struct net *net) | |
137 | { | |
138 | return net_generic(net, sctp_net_id); | |
139 | } | |
140 | ||
09f263cd JE |
141 | static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
142 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 143 | { |
12c33aa2 JE |
144 | const struct sctphdr *hp; |
145 | struct sctphdr _hdr; | |
9fb9cbb1 | 146 | |
9fb9cbb1 YK |
147 | /* Actually only need first 8 bytes. */ |
148 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); | |
149 | if (hp == NULL) | |
09f263cd | 150 | return false; |
9fb9cbb1 YK |
151 | |
152 | tuple->src.u.sctp.port = hp->source; | |
153 | tuple->dst.u.sctp.port = hp->dest; | |
09f263cd | 154 | return true; |
9fb9cbb1 YK |
155 | } |
156 | ||
09f263cd JE |
157 | static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple, |
158 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 159 | { |
9fb9cbb1 YK |
160 | tuple->src.u.sctp.port = orig->dst.u.sctp.port; |
161 | tuple->dst.u.sctp.port = orig->src.u.sctp.port; | |
09f263cd | 162 | return true; |
9fb9cbb1 YK |
163 | } |
164 | ||
165 | /* Print out the per-protocol part of the tuple. */ | |
166 | static int sctp_print_tuple(struct seq_file *s, | |
167 | const struct nf_conntrack_tuple *tuple) | |
168 | { | |
9fb9cbb1 YK |
169 | return seq_printf(s, "sport=%hu dport=%hu ", |
170 | ntohs(tuple->src.u.sctp.port), | |
171 | ntohs(tuple->dst.u.sctp.port)); | |
172 | } | |
173 | ||
174 | /* Print out the private part of the conntrack. */ | |
440f0d58 | 175 | static int sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
9fb9cbb1 YK |
176 | { |
177 | enum sctp_conntrack state; | |
178 | ||
440f0d58 | 179 | spin_lock_bh(&ct->lock); |
112f35c9 | 180 | state = ct->proto.sctp.state; |
440f0d58 | 181 | spin_unlock_bh(&ct->lock); |
9fb9cbb1 YK |
182 | |
183 | return seq_printf(s, "%s ", sctp_conntrack_names[state]); | |
184 | } | |
185 | ||
186 | #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \ | |
e79ec50b JE |
187 | for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \ |
188 | (offset) < (skb)->len && \ | |
189 | ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \ | |
190 | (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++) | |
9fb9cbb1 YK |
191 | |
192 | /* Some validity checks to make sure the chunks are fine */ | |
112f35c9 | 193 | static int do_basic_checks(struct nf_conn *ct, |
9fb9cbb1 YK |
194 | const struct sk_buff *skb, |
195 | unsigned int dataoff, | |
35c6d3cb | 196 | unsigned long *map) |
9fb9cbb1 YK |
197 | { |
198 | u_int32_t offset, count; | |
199 | sctp_chunkhdr_t _sch, *sch; | |
200 | int flag; | |
201 | ||
9fb9cbb1 YK |
202 | flag = 0; |
203 | ||
204 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { | |
0d53778e | 205 | pr_debug("Chunk Num: %d Type: %d\n", count, sch->type); |
9fb9cbb1 | 206 | |
5447d477 PM |
207 | if (sch->type == SCTP_CID_INIT || |
208 | sch->type == SCTP_CID_INIT_ACK || | |
209 | sch->type == SCTP_CID_SHUTDOWN_COMPLETE) | |
9fb9cbb1 | 210 | flag = 1; |
9fb9cbb1 | 211 | |
e17df688 PM |
212 | /* |
213 | * Cookie Ack/Echo chunks not the first OR | |
214 | * Init / Init Ack / Shutdown compl chunks not the only chunks | |
215 | * OR zero-length. | |
216 | */ | |
5447d477 PM |
217 | if (((sch->type == SCTP_CID_COOKIE_ACK || |
218 | sch->type == SCTP_CID_COOKIE_ECHO || | |
219 | flag) && | |
220 | count != 0) || !sch->length) { | |
0d53778e | 221 | pr_debug("Basic checks failed\n"); |
9fb9cbb1 YK |
222 | return 1; |
223 | } | |
224 | ||
5447d477 | 225 | if (map) |
35c6d3cb | 226 | set_bit(sch->type, map); |
9fb9cbb1 YK |
227 | } |
228 | ||
0d53778e | 229 | pr_debug("Basic checks passed\n"); |
dd7271fe | 230 | return count == 0; |
9fb9cbb1 YK |
231 | } |
232 | ||
efe9f68a PM |
233 | static int sctp_new_state(enum ip_conntrack_dir dir, |
234 | enum sctp_conntrack cur_state, | |
235 | int chunk_type) | |
9fb9cbb1 YK |
236 | { |
237 | int i; | |
238 | ||
0d53778e | 239 | pr_debug("Chunk type: %d\n", chunk_type); |
9fb9cbb1 YK |
240 | |
241 | switch (chunk_type) { | |
5447d477 PM |
242 | case SCTP_CID_INIT: |
243 | pr_debug("SCTP_CID_INIT\n"); | |
244 | i = 0; | |
245 | break; | |
246 | case SCTP_CID_INIT_ACK: | |
247 | pr_debug("SCTP_CID_INIT_ACK\n"); | |
248 | i = 1; | |
249 | break; | |
250 | case SCTP_CID_ABORT: | |
251 | pr_debug("SCTP_CID_ABORT\n"); | |
252 | i = 2; | |
253 | break; | |
254 | case SCTP_CID_SHUTDOWN: | |
255 | pr_debug("SCTP_CID_SHUTDOWN\n"); | |
256 | i = 3; | |
257 | break; | |
258 | case SCTP_CID_SHUTDOWN_ACK: | |
259 | pr_debug("SCTP_CID_SHUTDOWN_ACK\n"); | |
260 | i = 4; | |
261 | break; | |
262 | case SCTP_CID_ERROR: | |
263 | pr_debug("SCTP_CID_ERROR\n"); | |
264 | i = 5; | |
265 | break; | |
266 | case SCTP_CID_COOKIE_ECHO: | |
267 | pr_debug("SCTP_CID_COOKIE_ECHO\n"); | |
268 | i = 6; | |
269 | break; | |
270 | case SCTP_CID_COOKIE_ACK: | |
271 | pr_debug("SCTP_CID_COOKIE_ACK\n"); | |
272 | i = 7; | |
273 | break; | |
274 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
275 | pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n"); | |
276 | i = 8; | |
277 | break; | |
278 | default: | |
279 | /* Other chunks like DATA, SACK, HEARTBEAT and | |
280 | its ACK do not cause a change in state */ | |
281 | pr_debug("Unknown chunk type, Will stay in %s\n", | |
282 | sctp_conntrack_names[cur_state]); | |
283 | return cur_state; | |
9fb9cbb1 YK |
284 | } |
285 | ||
0d53778e PM |
286 | pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n", |
287 | dir, sctp_conntrack_names[cur_state], chunk_type, | |
288 | sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]); | |
9fb9cbb1 YK |
289 | |
290 | return sctp_conntracks[dir][i][cur_state]; | |
291 | } | |
292 | ||
2c8503f5 PNA |
293 | static unsigned int *sctp_get_timeouts(struct net *net) |
294 | { | |
49d485a3 | 295 | return sctp_pernet(net)->timeouts; |
2c8503f5 PNA |
296 | } |
297 | ||
b37e933a | 298 | /* Returns verdict for packet, or -NF_ACCEPT for invalid. */ |
112f35c9 | 299 | static int sctp_packet(struct nf_conn *ct, |
9fb9cbb1 YK |
300 | const struct sk_buff *skb, |
301 | unsigned int dataoff, | |
302 | enum ip_conntrack_info ctinfo, | |
76108cea | 303 | u_int8_t pf, |
2c8503f5 PNA |
304 | unsigned int hooknum, |
305 | unsigned int *timeouts) | |
9fb9cbb1 | 306 | { |
efe9f68a | 307 | enum sctp_conntrack new_state, old_state; |
8528819a | 308 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
12c33aa2 JE |
309 | const struct sctphdr *sh; |
310 | struct sctphdr _sctph; | |
311 | const struct sctp_chunkhdr *sch; | |
312 | struct sctp_chunkhdr _sch; | |
9fb9cbb1 | 313 | u_int32_t offset, count; |
35c6d3cb | 314 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
9fb9cbb1 | 315 | |
9fb9cbb1 YK |
316 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
317 | if (sh == NULL) | |
b37e933a | 318 | goto out; |
9fb9cbb1 | 319 | |
112f35c9 | 320 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
b37e933a | 321 | goto out; |
9fb9cbb1 YK |
322 | |
323 | /* Check the verification tag (Sec 8.5) */ | |
35c6d3cb PM |
324 | if (!test_bit(SCTP_CID_INIT, map) && |
325 | !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) && | |
326 | !test_bit(SCTP_CID_COOKIE_ECHO, map) && | |
327 | !test_bit(SCTP_CID_ABORT, map) && | |
328 | !test_bit(SCTP_CID_SHUTDOWN_ACK, map) && | |
8528819a | 329 | sh->vtag != ct->proto.sctp.vtag[dir]) { |
0d53778e | 330 | pr_debug("Verification tag check failed\n"); |
b37e933a | 331 | goto out; |
9fb9cbb1 YK |
332 | } |
333 | ||
328bd899 | 334 | old_state = new_state = SCTP_CONNTRACK_NONE; |
440f0d58 | 335 | spin_lock_bh(&ct->lock); |
9fb9cbb1 | 336 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
9fb9cbb1 YK |
337 | /* Special cases of Verification tag check (Sec 8.5.1) */ |
338 | if (sch->type == SCTP_CID_INIT) { | |
339 | /* Sec 8.5.1 (A) */ | |
b37e933a PM |
340 | if (sh->vtag != 0) |
341 | goto out_unlock; | |
9fb9cbb1 YK |
342 | } else if (sch->type == SCTP_CID_ABORT) { |
343 | /* Sec 8.5.1 (B) */ | |
8528819a | 344 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
b37e933a PM |
345 | sh->vtag != ct->proto.sctp.vtag[!dir]) |
346 | goto out_unlock; | |
9fb9cbb1 YK |
347 | } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) { |
348 | /* Sec 8.5.1 (C) */ | |
8528819a PM |
349 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
350 | sh->vtag != ct->proto.sctp.vtag[!dir] && | |
9b1c2cfd | 351 | sch->flags & SCTP_CHUNK_FLAG_T) |
b37e933a | 352 | goto out_unlock; |
9fb9cbb1 YK |
353 | } else if (sch->type == SCTP_CID_COOKIE_ECHO) { |
354 | /* Sec 8.5.1 (D) */ | |
b37e933a PM |
355 | if (sh->vtag != ct->proto.sctp.vtag[dir]) |
356 | goto out_unlock; | |
9fb9cbb1 YK |
357 | } |
358 | ||
efe9f68a PM |
359 | old_state = ct->proto.sctp.state; |
360 | new_state = sctp_new_state(dir, old_state, sch->type); | |
9fb9cbb1 YK |
361 | |
362 | /* Invalid */ | |
efe9f68a | 363 | if (new_state == SCTP_CONNTRACK_MAX) { |
0d53778e PM |
364 | pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u " |
365 | "conntrack=%u\n", | |
efe9f68a | 366 | dir, sch->type, old_state); |
b37e933a | 367 | goto out_unlock; |
9fb9cbb1 YK |
368 | } |
369 | ||
370 | /* If it is an INIT or an INIT ACK note down the vtag */ | |
5447d477 PM |
371 | if (sch->type == SCTP_CID_INIT || |
372 | sch->type == SCTP_CID_INIT_ACK) { | |
9fb9cbb1 YK |
373 | sctp_inithdr_t _inithdr, *ih; |
374 | ||
375 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
601e68e1 | 376 | sizeof(_inithdr), &_inithdr); |
b37e933a PM |
377 | if (ih == NULL) |
378 | goto out_unlock; | |
0d53778e | 379 | pr_debug("Setting vtag %x for dir %d\n", |
8528819a PM |
380 | ih->init_tag, !dir); |
381 | ct->proto.sctp.vtag[!dir] = ih->init_tag; | |
9fb9cbb1 YK |
382 | } |
383 | ||
efe9f68a PM |
384 | ct->proto.sctp.state = new_state; |
385 | if (old_state != new_state) | |
a71996fc | 386 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
9fb9cbb1 | 387 | } |
440f0d58 | 388 | spin_unlock_bh(&ct->lock); |
9fb9cbb1 | 389 | |
2c8503f5 | 390 | nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]); |
9fb9cbb1 | 391 | |
efe9f68a | 392 | if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED && |
8528819a | 393 | dir == IP_CT_DIR_REPLY && |
efe9f68a | 394 | new_state == SCTP_CONNTRACK_ESTABLISHED) { |
0d53778e | 395 | pr_debug("Setting assured bit\n"); |
112f35c9 | 396 | set_bit(IPS_ASSURED_BIT, &ct->status); |
858b3133 | 397 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
9fb9cbb1 YK |
398 | } |
399 | ||
400 | return NF_ACCEPT; | |
b37e933a PM |
401 | |
402 | out_unlock: | |
440f0d58 | 403 | spin_unlock_bh(&ct->lock); |
b37e933a PM |
404 | out: |
405 | return -NF_ACCEPT; | |
9fb9cbb1 YK |
406 | } |
407 | ||
408 | /* Called when a new connection for this protocol found. */ | |
09f263cd | 409 | static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb, |
2c8503f5 | 410 | unsigned int dataoff, unsigned int *timeouts) |
9fb9cbb1 | 411 | { |
efe9f68a | 412 | enum sctp_conntrack new_state; |
12c33aa2 JE |
413 | const struct sctphdr *sh; |
414 | struct sctphdr _sctph; | |
415 | const struct sctp_chunkhdr *sch; | |
416 | struct sctp_chunkhdr _sch; | |
9fb9cbb1 | 417 | u_int32_t offset, count; |
35c6d3cb | 418 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
9fb9cbb1 | 419 | |
9fb9cbb1 YK |
420 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
421 | if (sh == NULL) | |
09f263cd | 422 | return false; |
9fb9cbb1 | 423 | |
112f35c9 | 424 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
09f263cd | 425 | return false; |
9fb9cbb1 YK |
426 | |
427 | /* If an OOTB packet has any of these chunks discard (Sec 8.4) */ | |
35c6d3cb PM |
428 | if (test_bit(SCTP_CID_ABORT, map) || |
429 | test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) || | |
430 | test_bit(SCTP_CID_COOKIE_ACK, map)) | |
09f263cd | 431 | return false; |
9fb9cbb1 | 432 | |
e5fc9e7a | 433 | memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp)); |
efe9f68a | 434 | new_state = SCTP_CONNTRACK_MAX; |
9fb9cbb1 YK |
435 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
436 | /* Don't need lock here: this conntrack not in circulation yet */ | |
efe9f68a PM |
437 | new_state = sctp_new_state(IP_CT_DIR_ORIGINAL, |
438 | SCTP_CONNTRACK_NONE, sch->type); | |
9fb9cbb1 YK |
439 | |
440 | /* Invalid: delete conntrack */ | |
efe9f68a PM |
441 | if (new_state == SCTP_CONNTRACK_NONE || |
442 | new_state == SCTP_CONNTRACK_MAX) { | |
0d53778e | 443 | pr_debug("nf_conntrack_sctp: invalid new deleting.\n"); |
09f263cd | 444 | return false; |
9fb9cbb1 YK |
445 | } |
446 | ||
447 | /* Copy the vtag into the state info */ | |
448 | if (sch->type == SCTP_CID_INIT) { | |
449 | if (sh->vtag == 0) { | |
450 | sctp_inithdr_t _inithdr, *ih; | |
451 | ||
452 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
601e68e1 | 453 | sizeof(_inithdr), &_inithdr); |
9fb9cbb1 | 454 | if (ih == NULL) |
09f263cd | 455 | return false; |
9fb9cbb1 | 456 | |
0d53778e PM |
457 | pr_debug("Setting vtag %x for new conn\n", |
458 | ih->init_tag); | |
9fb9cbb1 | 459 | |
112f35c9 | 460 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
9fb9cbb1 YK |
461 | ih->init_tag; |
462 | } else { | |
463 | /* Sec 8.5.1 (A) */ | |
09f263cd | 464 | return false; |
9fb9cbb1 YK |
465 | } |
466 | } | |
467 | /* If it is a shutdown ack OOTB packet, we expect a return | |
468 | shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */ | |
469 | else { | |
0d53778e PM |
470 | pr_debug("Setting vtag %x for new conn OOTB\n", |
471 | sh->vtag); | |
112f35c9 | 472 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag; |
9fb9cbb1 YK |
473 | } |
474 | ||
efe9f68a | 475 | ct->proto.sctp.state = new_state; |
9fb9cbb1 YK |
476 | } |
477 | ||
09f263cd | 478 | return true; |
9fb9cbb1 YK |
479 | } |
480 | ||
c0cd1156 | 481 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
a258860e PNA |
482 | |
483 | #include <linux/netfilter/nfnetlink.h> | |
484 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
485 | ||
486 | static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, | |
440f0d58 | 487 | struct nf_conn *ct) |
a258860e PNA |
488 | { |
489 | struct nlattr *nest_parms; | |
490 | ||
440f0d58 | 491 | spin_lock_bh(&ct->lock); |
a258860e PNA |
492 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED); |
493 | if (!nest_parms) | |
494 | goto nla_put_failure; | |
495 | ||
5e8d1eb5 DM |
496 | if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state) || |
497 | nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL, | |
498 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) || | |
499 | nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY, | |
500 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY])) | |
501 | goto nla_put_failure; | |
a258860e | 502 | |
440f0d58 | 503 | spin_unlock_bh(&ct->lock); |
a258860e PNA |
504 | |
505 | nla_nest_end(skb, nest_parms); | |
506 | ||
507 | return 0; | |
508 | ||
509 | nla_put_failure: | |
440f0d58 | 510 | spin_unlock_bh(&ct->lock); |
a258860e PNA |
511 | return -1; |
512 | } | |
513 | ||
514 | static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = { | |
515 | [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 }, | |
516 | [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 }, | |
517 | [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 }, | |
518 | }; | |
519 | ||
520 | static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct) | |
521 | { | |
522 | struct nlattr *attr = cda[CTA_PROTOINFO_SCTP]; | |
523 | struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1]; | |
524 | int err; | |
525 | ||
526 | /* updates may not contain the internal protocol info, skip parsing */ | |
527 | if (!attr) | |
528 | return 0; | |
529 | ||
530 | err = nla_parse_nested(tb, | |
531 | CTA_PROTOINFO_SCTP_MAX, | |
532 | attr, | |
533 | sctp_nla_policy); | |
534 | if (err < 0) | |
535 | return err; | |
536 | ||
537 | if (!tb[CTA_PROTOINFO_SCTP_STATE] || | |
538 | !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] || | |
539 | !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]) | |
540 | return -EINVAL; | |
541 | ||
440f0d58 | 542 | spin_lock_bh(&ct->lock); |
a258860e PNA |
543 | ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]); |
544 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = | |
5547cd0a | 545 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]); |
a258860e | 546 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
5547cd0a | 547 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]); |
440f0d58 | 548 | spin_unlock_bh(&ct->lock); |
a258860e PNA |
549 | |
550 | return 0; | |
551 | } | |
a400c30e HE |
552 | |
553 | static int sctp_nlattr_size(void) | |
554 | { | |
555 | return nla_total_size(0) /* CTA_PROTOINFO_SCTP */ | |
556 | + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1); | |
557 | } | |
a258860e PNA |
558 | #endif |
559 | ||
50978462 PNA |
560 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
561 | ||
562 | #include <linux/netfilter/nfnetlink.h> | |
563 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
564 | ||
565 | static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) | |
566 | { | |
567 | unsigned int *timeouts = data; | |
568 | int i; | |
569 | ||
570 | /* set default SCTP timeouts. */ | |
571 | for (i=0; i<SCTP_CONNTRACK_MAX; i++) | |
572 | timeouts[i] = sctp_timeouts[i]; | |
573 | ||
574 | /* there's a 1:1 mapping between attributes and protocol states. */ | |
575 | for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) { | |
576 | if (tb[i]) { | |
577 | timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ; | |
578 | } | |
579 | } | |
580 | return 0; | |
581 | } | |
582 | ||
583 | static int | |
584 | sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) | |
585 | { | |
586 | const unsigned int *timeouts = data; | |
587 | int i; | |
588 | ||
5e8d1eb5 DM |
589 | for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) { |
590 | if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ))) | |
591 | goto nla_put_failure; | |
592 | } | |
50978462 PNA |
593 | return 0; |
594 | ||
595 | nla_put_failure: | |
596 | return -ENOSPC; | |
597 | } | |
598 | ||
599 | static const struct nla_policy | |
600 | sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = { | |
601 | [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 }, | |
602 | [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 }, | |
603 | [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 }, | |
604 | [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 }, | |
605 | [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 }, | |
606 | [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 }, | |
607 | [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 }, | |
608 | }; | |
609 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
610 | ||
611 | ||
9fb9cbb1 | 612 | #ifdef CONFIG_SYSCTL |
933a41e7 | 613 | static struct ctl_table sctp_sysctl_table[] = { |
9fb9cbb1 | 614 | { |
9fb9cbb1 | 615 | .procname = "nf_conntrack_sctp_timeout_closed", |
9fb9cbb1 YK |
616 | .maxlen = sizeof(unsigned int), |
617 | .mode = 0644, | |
6d9f239a | 618 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
619 | }, |
620 | { | |
9fb9cbb1 | 621 | .procname = "nf_conntrack_sctp_timeout_cookie_wait", |
9fb9cbb1 YK |
622 | .maxlen = sizeof(unsigned int), |
623 | .mode = 0644, | |
6d9f239a | 624 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
625 | }, |
626 | { | |
9fb9cbb1 | 627 | .procname = "nf_conntrack_sctp_timeout_cookie_echoed", |
9fb9cbb1 YK |
628 | .maxlen = sizeof(unsigned int), |
629 | .mode = 0644, | |
6d9f239a | 630 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
631 | }, |
632 | { | |
9fb9cbb1 | 633 | .procname = "nf_conntrack_sctp_timeout_established", |
9fb9cbb1 YK |
634 | .maxlen = sizeof(unsigned int), |
635 | .mode = 0644, | |
6d9f239a | 636 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
637 | }, |
638 | { | |
9fb9cbb1 | 639 | .procname = "nf_conntrack_sctp_timeout_shutdown_sent", |
9fb9cbb1 YK |
640 | .maxlen = sizeof(unsigned int), |
641 | .mode = 0644, | |
6d9f239a | 642 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
643 | }, |
644 | { | |
9fb9cbb1 | 645 | .procname = "nf_conntrack_sctp_timeout_shutdown_recd", |
9fb9cbb1 YK |
646 | .maxlen = sizeof(unsigned int), |
647 | .mode = 0644, | |
6d9f239a | 648 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
649 | }, |
650 | { | |
9fb9cbb1 | 651 | .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent", |
9fb9cbb1 YK |
652 | .maxlen = sizeof(unsigned int), |
653 | .mode = 0644, | |
6d9f239a | 654 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 | 655 | }, |
f8572d8f | 656 | { } |
9fb9cbb1 | 657 | }; |
a999e683 PM |
658 | |
659 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
660 | static struct ctl_table sctp_compat_sysctl_table[] = { | |
661 | { | |
a999e683 | 662 | .procname = "ip_conntrack_sctp_timeout_closed", |
a999e683 PM |
663 | .maxlen = sizeof(unsigned int), |
664 | .mode = 0644, | |
6d9f239a | 665 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
666 | }, |
667 | { | |
a999e683 | 668 | .procname = "ip_conntrack_sctp_timeout_cookie_wait", |
a999e683 PM |
669 | .maxlen = sizeof(unsigned int), |
670 | .mode = 0644, | |
6d9f239a | 671 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
672 | }, |
673 | { | |
a999e683 | 674 | .procname = "ip_conntrack_sctp_timeout_cookie_echoed", |
a999e683 PM |
675 | .maxlen = sizeof(unsigned int), |
676 | .mode = 0644, | |
6d9f239a | 677 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
678 | }, |
679 | { | |
a999e683 | 680 | .procname = "ip_conntrack_sctp_timeout_established", |
a999e683 PM |
681 | .maxlen = sizeof(unsigned int), |
682 | .mode = 0644, | |
6d9f239a | 683 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
684 | }, |
685 | { | |
a999e683 | 686 | .procname = "ip_conntrack_sctp_timeout_shutdown_sent", |
a999e683 PM |
687 | .maxlen = sizeof(unsigned int), |
688 | .mode = 0644, | |
6d9f239a | 689 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
690 | }, |
691 | { | |
a999e683 | 692 | .procname = "ip_conntrack_sctp_timeout_shutdown_recd", |
a999e683 PM |
693 | .maxlen = sizeof(unsigned int), |
694 | .mode = 0644, | |
6d9f239a | 695 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
696 | }, |
697 | { | |
a999e683 | 698 | .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent", |
a999e683 PM |
699 | .maxlen = sizeof(unsigned int), |
700 | .mode = 0644, | |
6d9f239a | 701 | .proc_handler = proc_dointvec_jiffies, |
a999e683 | 702 | }, |
f8572d8f | 703 | { } |
a999e683 PM |
704 | }; |
705 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
933a41e7 | 706 | #endif |
9fb9cbb1 | 707 | |
49d485a3 G |
708 | static void sctp_init_net_data(struct sctp_net *sn) |
709 | { | |
710 | int i; | |
711 | #ifdef CONFIG_SYSCTL | |
712 | if (!sn->pn.ctl_table) { | |
713 | #else | |
714 | if (!sn->pn.users++) { | |
715 | #endif | |
716 | for (i = 0; i < SCTP_CONNTRACK_MAX; i++) | |
717 | sn->timeouts[i] = sctp_timeouts[i]; | |
718 | } | |
719 | } | |
720 | ||
721 | static int sctp_kmemdup_sysctl_table(struct nf_proto_net *pn) | |
722 | { | |
723 | #ifdef CONFIG_SYSCTL | |
724 | struct sctp_net *sn = (struct sctp_net *)pn; | |
725 | if (pn->ctl_table) | |
726 | return 0; | |
727 | ||
728 | pn->ctl_table = kmemdup(sctp_sysctl_table, | |
729 | sizeof(sctp_sysctl_table), | |
730 | GFP_KERNEL); | |
731 | if (!pn->ctl_table) | |
732 | return -ENOMEM; | |
733 | ||
734 | pn->ctl_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED]; | |
735 | pn->ctl_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT]; | |
736 | pn->ctl_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED]; | |
737 | pn->ctl_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED]; | |
738 | pn->ctl_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT]; | |
739 | pn->ctl_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD]; | |
740 | pn->ctl_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]; | |
741 | #endif | |
742 | return 0; | |
743 | } | |
744 | ||
745 | static int sctp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn) | |
746 | { | |
747 | #ifdef CONFIG_SYSCTL | |
748 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
749 | struct sctp_net *sn = (struct sctp_net *)pn; | |
750 | pn->ctl_compat_table = kmemdup(sctp_compat_sysctl_table, | |
751 | sizeof(sctp_compat_sysctl_table), | |
752 | GFP_KERNEL); | |
753 | if (!pn->ctl_compat_table) | |
754 | return -ENOMEM; | |
755 | ||
756 | pn->ctl_compat_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED]; | |
757 | pn->ctl_compat_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT]; | |
758 | pn->ctl_compat_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED]; | |
759 | pn->ctl_compat_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED]; | |
760 | pn->ctl_compat_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT]; | |
761 | pn->ctl_compat_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD]; | |
762 | pn->ctl_compat_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]; | |
763 | #endif | |
764 | #endif | |
765 | return 0; | |
766 | } | |
767 | ||
768 | static int sctpv4_init_net(struct net *net) | |
769 | { | |
770 | int ret; | |
771 | struct sctp_net *sn = sctp_pernet(net); | |
772 | struct nf_proto_net *pn = (struct nf_proto_net *)sn; | |
773 | ||
774 | sctp_init_net_data(sn); | |
775 | ||
776 | ret = sctp_kmemdup_compat_sysctl_table(pn); | |
777 | if (ret < 0) | |
778 | return ret; | |
779 | ||
780 | ret = sctp_kmemdup_sysctl_table(pn); | |
781 | ||
782 | #ifdef CONFIG_SYSCTL | |
783 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
784 | if (ret < 0) { | |
785 | ||
786 | kfree(pn->ctl_compat_table); | |
787 | pn->ctl_compat_table = NULL; | |
788 | } | |
789 | #endif | |
790 | #endif | |
791 | return ret; | |
792 | } | |
793 | ||
794 | static int sctpv6_init_net(struct net *net) | |
795 | { | |
796 | struct sctp_net *sn = sctp_pernet(net); | |
797 | struct nf_proto_net *pn = (struct nf_proto_net *)sn; | |
798 | ||
799 | sctp_init_net_data(sn); | |
800 | return sctp_kmemdup_sysctl_table(pn); | |
801 | } | |
802 | ||
61075af5 | 803 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = { |
933a41e7 PM |
804 | .l3proto = PF_INET, |
805 | .l4proto = IPPROTO_SCTP, | |
806 | .name = "sctp", | |
807 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
808 | .invert_tuple = sctp_invert_tuple, | |
809 | .print_tuple = sctp_print_tuple, | |
810 | .print_conntrack = sctp_print_conntrack, | |
811 | .packet = sctp_packet, | |
2c8503f5 | 812 | .get_timeouts = sctp_get_timeouts, |
933a41e7 PM |
813 | .new = sctp_new, |
814 | .me = THIS_MODULE, | |
c0cd1156 | 815 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
a258860e | 816 | .to_nlattr = sctp_to_nlattr, |
a400c30e | 817 | .nlattr_size = sctp_nlattr_size, |
a258860e | 818 | .from_nlattr = nlattr_to_sctp, |
c7212e9d | 819 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
a400c30e | 820 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
c7212e9d PNA |
821 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
822 | .nla_policy = nf_ct_port_nla_policy, | |
823 | #endif | |
50978462 PNA |
824 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
825 | .ctnl_timeout = { | |
826 | .nlattr_to_obj = sctp_timeout_nlattr_to_obj, | |
827 | .obj_to_nlattr = sctp_timeout_obj_to_nlattr, | |
828 | .nlattr_max = CTA_TIMEOUT_SCTP_MAX, | |
829 | .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX, | |
830 | .nla_policy = sctp_timeout_nla_policy, | |
831 | }, | |
832 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
49d485a3 G |
833 | .net_id = &sctp_net_id, |
834 | .init_net = sctpv4_init_net, | |
9fb9cbb1 YK |
835 | }; |
836 | ||
61075af5 | 837 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = { |
933a41e7 PM |
838 | .l3proto = PF_INET6, |
839 | .l4proto = IPPROTO_SCTP, | |
840 | .name = "sctp", | |
841 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
842 | .invert_tuple = sctp_invert_tuple, | |
843 | .print_tuple = sctp_print_tuple, | |
844 | .print_conntrack = sctp_print_conntrack, | |
845 | .packet = sctp_packet, | |
2c8503f5 | 846 | .get_timeouts = sctp_get_timeouts, |
933a41e7 PM |
847 | .new = sctp_new, |
848 | .me = THIS_MODULE, | |
c0cd1156 | 849 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
a258860e | 850 | .to_nlattr = sctp_to_nlattr, |
a400c30e | 851 | .nlattr_size = sctp_nlattr_size, |
a258860e | 852 | .from_nlattr = nlattr_to_sctp, |
c7212e9d | 853 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
a400c30e | 854 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
c7212e9d PNA |
855 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
856 | .nla_policy = nf_ct_port_nla_policy, | |
50978462 PNA |
857 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
858 | .ctnl_timeout = { | |
859 | .nlattr_to_obj = sctp_timeout_nlattr_to_obj, | |
860 | .obj_to_nlattr = sctp_timeout_obj_to_nlattr, | |
861 | .nlattr_max = CTA_TIMEOUT_SCTP_MAX, | |
862 | .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX, | |
863 | .nla_policy = sctp_timeout_nla_policy, | |
864 | }, | |
865 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
9fb9cbb1 | 866 | #endif |
49d485a3 G |
867 | .net_id = &sctp_net_id, |
868 | .init_net = sctpv6_init_net, | |
933a41e7 | 869 | }; |
9fb9cbb1 | 870 | |
49d485a3 | 871 | static int sctp_net_init(struct net *net) |
9fb9cbb1 | 872 | { |
49d485a3 | 873 | int ret = 0; |
9fb9cbb1 | 874 | |
49d485a3 G |
875 | ret = nf_conntrack_l4proto_register(net, |
876 | &nf_conntrack_l4proto_sctp4); | |
877 | if (ret < 0) { | |
878 | pr_err("nf_conntrack_l4proto_sctp4 :protocol register failed.\n"); | |
9fb9cbb1 YK |
879 | goto out; |
880 | } | |
49d485a3 G |
881 | ret = nf_conntrack_l4proto_register(net, |
882 | &nf_conntrack_l4proto_sctp6); | |
883 | if (ret < 0) { | |
884 | pr_err("nf_conntrack_l4proto_sctp6 :protocol register failed.\n"); | |
9fb9cbb1 YK |
885 | goto cleanup_sctp4; |
886 | } | |
49d485a3 | 887 | return 0; |
9fb9cbb1 | 888 | |
49d485a3 G |
889 | cleanup_sctp4: |
890 | nf_conntrack_l4proto_unregister(net, | |
891 | &nf_conntrack_l4proto_sctp4); | |
892 | out: | |
9fb9cbb1 | 893 | return ret; |
49d485a3 | 894 | } |
9fb9cbb1 | 895 | |
49d485a3 G |
896 | static void sctp_net_exit(struct net *net) |
897 | { | |
898 | nf_conntrack_l4proto_unregister(net, | |
899 | &nf_conntrack_l4proto_sctp6); | |
900 | nf_conntrack_l4proto_unregister(net, | |
901 | &nf_conntrack_l4proto_sctp4); | |
902 | } | |
903 | ||
904 | static struct pernet_operations sctp_net_ops = { | |
905 | .init = sctp_net_init, | |
906 | .exit = sctp_net_exit, | |
907 | .id = &sctp_net_id, | |
908 | .size = sizeof(struct sctp_net), | |
909 | }; | |
910 | ||
911 | static int __init nf_conntrack_proto_sctp_init(void) | |
912 | { | |
913 | return register_pernet_subsys(&sctp_net_ops); | |
9fb9cbb1 YK |
914 | } |
915 | ||
2f0d2f10 | 916 | static void __exit nf_conntrack_proto_sctp_fini(void) |
9fb9cbb1 | 917 | { |
49d485a3 | 918 | unregister_pernet_subsys(&sctp_net_ops); |
9fb9cbb1 YK |
919 | } |
920 | ||
65b4b4e8 AM |
921 | module_init(nf_conntrack_proto_sctp_init); |
922 | module_exit(nf_conntrack_proto_sctp_fini); | |
9fb9cbb1 YK |
923 | |
924 | MODULE_LICENSE("GPL"); | |
925 | MODULE_AUTHOR("Kiran Kumar Immidi"); | |
926 | MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP"); | |
d2483dde | 927 | MODULE_ALIAS("ip_conntrack_proto_sctp"); |