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Commit | Line | Data |
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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", | |
d7ee3519 MK |
45 | "HEARTBEAT_SENT", |
46 | "HEARTBEAT_ACKED", | |
9fb9cbb1 YK |
47 | }; |
48 | ||
49 | #define SECS * HZ | |
50 | #define MINS * 60 SECS | |
51 | #define HOURS * 60 MINS | |
52 | #define DAYS * 24 HOURS | |
53 | ||
86c0bf40 PM |
54 | static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = { |
55 | [SCTP_CONNTRACK_CLOSED] = 10 SECS, | |
56 | [SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS, | |
57 | [SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS, | |
58 | [SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS, | |
59 | [SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000, | |
60 | [SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000, | |
61 | [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS, | |
d7ee3519 MK |
62 | [SCTP_CONNTRACK_HEARTBEAT_SENT] = 30 SECS, |
63 | [SCTP_CONNTRACK_HEARTBEAT_ACKED] = 210 SECS, | |
86c0bf40 | 64 | }; |
9fb9cbb1 YK |
65 | |
66 | #define sNO SCTP_CONNTRACK_NONE | |
67 | #define sCL SCTP_CONNTRACK_CLOSED | |
68 | #define sCW SCTP_CONNTRACK_COOKIE_WAIT | |
69 | #define sCE SCTP_CONNTRACK_COOKIE_ECHOED | |
70 | #define sES SCTP_CONNTRACK_ESTABLISHED | |
71 | #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT | |
72 | #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD | |
73 | #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT | |
d7ee3519 MK |
74 | #define sHS SCTP_CONNTRACK_HEARTBEAT_SENT |
75 | #define sHA SCTP_CONNTRACK_HEARTBEAT_ACKED | |
9fb9cbb1 YK |
76 | #define sIV SCTP_CONNTRACK_MAX |
77 | ||
601e68e1 | 78 | /* |
9fb9cbb1 YK |
79 | These are the descriptions of the states: |
80 | ||
601e68e1 | 81 | NOTE: These state names are tantalizingly similar to the states of an |
9fb9cbb1 | 82 | SCTP endpoint. But the interpretation of the states is a little different, |
601e68e1 | 83 | considering that these are the states of the connection and not of an end |
9fb9cbb1 YK |
84 | point. Please note the subtleties. -Kiran |
85 | ||
86 | NONE - Nothing so far. | |
601e68e1 YH |
87 | COOKIE WAIT - We have seen an INIT chunk in the original direction, or also |
88 | an INIT_ACK chunk in the reply direction. | |
9fb9cbb1 YK |
89 | COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction. |
90 | ESTABLISHED - We have seen a COOKIE_ACK in the reply direction. | |
91 | SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction. | |
92 | SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin. | |
93 | SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite | |
601e68e1 YH |
94 | to that of the SHUTDOWN chunk. |
95 | CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of | |
96 | the SHUTDOWN chunk. Connection is closed. | |
d7ee3519 MK |
97 | HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow. |
98 | HEARTBEAT_ACKED - We have seen a HEARTBEAT-ACK in the direction opposite to | |
99 | that of the HEARTBEAT chunk. Secondary connection is | |
100 | established. | |
9fb9cbb1 YK |
101 | */ |
102 | ||
103 | /* TODO | |
601e68e1 | 104 | - I have assumed that the first INIT is in the original direction. |
9fb9cbb1 YK |
105 | This messes things when an INIT comes in the reply direction in CLOSED |
106 | state. | |
601e68e1 | 107 | - Check the error type in the reply dir before transitioning from |
9fb9cbb1 YK |
108 | cookie echoed to closed. |
109 | - Sec 5.2.4 of RFC 2960 | |
d7ee3519 | 110 | - Full Multi Homing support. |
9fb9cbb1 YK |
111 | */ |
112 | ||
113 | /* SCTP conntrack state transitions */ | |
d7ee3519 | 114 | static const u8 sctp_conntracks[2][11][SCTP_CONNTRACK_MAX] = { |
9fb9cbb1 YK |
115 | { |
116 | /* ORIGINAL */ | |
d7ee3519 MK |
117 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */ |
118 | /* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA, sCW, sHA}, | |
119 | /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA}, | |
120 | /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, | |
121 | /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA, sCL, sSS}, | |
122 | /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA, sSA, sHA}, | |
123 | /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't have Stale cookie*/ | |
124 | /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* 5.2.4 - Big TODO */ | |
125 | /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't come in orig dir */ | |
126 | /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL, sCL, sHA}, | |
127 | /* heartbeat */ {sHS, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA}, | |
128 | /* heartbeat_ack*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA} | |
9fb9cbb1 YK |
129 | }, |
130 | { | |
131 | /* REPLY */ | |
d7ee3519 MK |
132 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */ |
133 | /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* INIT in sCL Big TODO */ | |
134 | /* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA}, | |
135 | /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV, sCL}, | |
136 | /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA, sIV, sSR}, | |
137 | /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA, sIV, sHA}, | |
138 | /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA, sIV, sHA}, | |
139 | /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* Can't come in reply dir */ | |
140 | /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA, sIV, sHA}, | |
141 | /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL, sIV, sHA}, | |
142 | /* heartbeat */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA}, | |
143 | /* heartbeat_ack*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHA, sHA} | |
9fb9cbb1 YK |
144 | } |
145 | }; | |
146 | ||
49d485a3 G |
147 | static int sctp_net_id __read_mostly; |
148 | struct sctp_net { | |
149 | struct nf_proto_net pn; | |
150 | unsigned int timeouts[SCTP_CONNTRACK_MAX]; | |
151 | }; | |
152 | ||
153 | static inline struct sctp_net *sctp_pernet(struct net *net) | |
154 | { | |
155 | return net_generic(net, sctp_net_id); | |
156 | } | |
157 | ||
09f263cd | 158 | static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
a31f1adc | 159 | struct net *net, struct nf_conntrack_tuple *tuple) |
9fb9cbb1 | 160 | { |
12c33aa2 JE |
161 | const struct sctphdr *hp; |
162 | struct sctphdr _hdr; | |
9fb9cbb1 | 163 | |
e5e693ab GF |
164 | /* Actually only need first 4 bytes to get ports. */ |
165 | hp = skb_header_pointer(skb, dataoff, 4, &_hdr); | |
9fb9cbb1 | 166 | if (hp == NULL) |
09f263cd | 167 | return false; |
9fb9cbb1 YK |
168 | |
169 | tuple->src.u.sctp.port = hp->source; | |
170 | tuple->dst.u.sctp.port = hp->dest; | |
09f263cd | 171 | return true; |
9fb9cbb1 YK |
172 | } |
173 | ||
09f263cd JE |
174 | static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple, |
175 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 176 | { |
9fb9cbb1 YK |
177 | tuple->src.u.sctp.port = orig->dst.u.sctp.port; |
178 | tuple->dst.u.sctp.port = orig->src.u.sctp.port; | |
09f263cd | 179 | return true; |
9fb9cbb1 YK |
180 | } |
181 | ||
182 | /* Print out the per-protocol part of the tuple. */ | |
824f1fbe JP |
183 | static void sctp_print_tuple(struct seq_file *s, |
184 | const struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 185 | { |
824f1fbe JP |
186 | seq_printf(s, "sport=%hu dport=%hu ", |
187 | ntohs(tuple->src.u.sctp.port), | |
188 | ntohs(tuple->dst.u.sctp.port)); | |
9fb9cbb1 YK |
189 | } |
190 | ||
191 | /* Print out the private part of the conntrack. */ | |
37246a58 | 192 | static void sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
9fb9cbb1 | 193 | { |
a163f2cb | 194 | seq_printf(s, "%s ", sctp_conntrack_names[ct->proto.sctp.state]); |
9fb9cbb1 YK |
195 | } |
196 | ||
197 | #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \ | |
e79ec50b JE |
198 | for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \ |
199 | (offset) < (skb)->len && \ | |
200 | ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \ | |
201 | (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++) | |
9fb9cbb1 YK |
202 | |
203 | /* Some validity checks to make sure the chunks are fine */ | |
112f35c9 | 204 | static int do_basic_checks(struct nf_conn *ct, |
9fb9cbb1 YK |
205 | const struct sk_buff *skb, |
206 | unsigned int dataoff, | |
35c6d3cb | 207 | unsigned long *map) |
9fb9cbb1 YK |
208 | { |
209 | u_int32_t offset, count; | |
210 | sctp_chunkhdr_t _sch, *sch; | |
211 | int flag; | |
212 | ||
9fb9cbb1 YK |
213 | flag = 0; |
214 | ||
215 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { | |
0d53778e | 216 | pr_debug("Chunk Num: %d Type: %d\n", count, sch->type); |
9fb9cbb1 | 217 | |
5447d477 PM |
218 | if (sch->type == SCTP_CID_INIT || |
219 | sch->type == SCTP_CID_INIT_ACK || | |
220 | sch->type == SCTP_CID_SHUTDOWN_COMPLETE) | |
9fb9cbb1 | 221 | flag = 1; |
9fb9cbb1 | 222 | |
e17df688 PM |
223 | /* |
224 | * Cookie Ack/Echo chunks not the first OR | |
225 | * Init / Init Ack / Shutdown compl chunks not the only chunks | |
226 | * OR zero-length. | |
227 | */ | |
5447d477 PM |
228 | if (((sch->type == SCTP_CID_COOKIE_ACK || |
229 | sch->type == SCTP_CID_COOKIE_ECHO || | |
230 | flag) && | |
231 | count != 0) || !sch->length) { | |
0d53778e | 232 | pr_debug("Basic checks failed\n"); |
9fb9cbb1 YK |
233 | return 1; |
234 | } | |
235 | ||
5447d477 | 236 | if (map) |
35c6d3cb | 237 | set_bit(sch->type, map); |
9fb9cbb1 YK |
238 | } |
239 | ||
0d53778e | 240 | pr_debug("Basic checks passed\n"); |
dd7271fe | 241 | return count == 0; |
9fb9cbb1 YK |
242 | } |
243 | ||
efe9f68a PM |
244 | static int sctp_new_state(enum ip_conntrack_dir dir, |
245 | enum sctp_conntrack cur_state, | |
246 | int chunk_type) | |
9fb9cbb1 YK |
247 | { |
248 | int i; | |
249 | ||
0d53778e | 250 | pr_debug("Chunk type: %d\n", chunk_type); |
9fb9cbb1 YK |
251 | |
252 | switch (chunk_type) { | |
5447d477 PM |
253 | case SCTP_CID_INIT: |
254 | pr_debug("SCTP_CID_INIT\n"); | |
255 | i = 0; | |
256 | break; | |
257 | case SCTP_CID_INIT_ACK: | |
258 | pr_debug("SCTP_CID_INIT_ACK\n"); | |
259 | i = 1; | |
260 | break; | |
261 | case SCTP_CID_ABORT: | |
262 | pr_debug("SCTP_CID_ABORT\n"); | |
263 | i = 2; | |
264 | break; | |
265 | case SCTP_CID_SHUTDOWN: | |
266 | pr_debug("SCTP_CID_SHUTDOWN\n"); | |
267 | i = 3; | |
268 | break; | |
269 | case SCTP_CID_SHUTDOWN_ACK: | |
270 | pr_debug("SCTP_CID_SHUTDOWN_ACK\n"); | |
271 | i = 4; | |
272 | break; | |
273 | case SCTP_CID_ERROR: | |
274 | pr_debug("SCTP_CID_ERROR\n"); | |
275 | i = 5; | |
276 | break; | |
277 | case SCTP_CID_COOKIE_ECHO: | |
278 | pr_debug("SCTP_CID_COOKIE_ECHO\n"); | |
279 | i = 6; | |
280 | break; | |
281 | case SCTP_CID_COOKIE_ACK: | |
282 | pr_debug("SCTP_CID_COOKIE_ACK\n"); | |
283 | i = 7; | |
284 | break; | |
285 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
286 | pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n"); | |
287 | i = 8; | |
288 | break; | |
d7ee3519 MK |
289 | case SCTP_CID_HEARTBEAT: |
290 | pr_debug("SCTP_CID_HEARTBEAT"); | |
291 | i = 9; | |
292 | break; | |
293 | case SCTP_CID_HEARTBEAT_ACK: | |
294 | pr_debug("SCTP_CID_HEARTBEAT_ACK"); | |
295 | i = 10; | |
296 | break; | |
5447d477 | 297 | default: |
d7ee3519 | 298 | /* Other chunks like DATA or SACK do not change the state */ |
5447d477 PM |
299 | pr_debug("Unknown chunk type, Will stay in %s\n", |
300 | sctp_conntrack_names[cur_state]); | |
301 | return cur_state; | |
9fb9cbb1 YK |
302 | } |
303 | ||
0d53778e PM |
304 | pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n", |
305 | dir, sctp_conntrack_names[cur_state], chunk_type, | |
306 | sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]); | |
9fb9cbb1 YK |
307 | |
308 | return sctp_conntracks[dir][i][cur_state]; | |
309 | } | |
310 | ||
2c8503f5 PNA |
311 | static unsigned int *sctp_get_timeouts(struct net *net) |
312 | { | |
49d485a3 | 313 | return sctp_pernet(net)->timeouts; |
2c8503f5 PNA |
314 | } |
315 | ||
b37e933a | 316 | /* Returns verdict for packet, or -NF_ACCEPT for invalid. */ |
112f35c9 | 317 | static int sctp_packet(struct nf_conn *ct, |
9fb9cbb1 YK |
318 | const struct sk_buff *skb, |
319 | unsigned int dataoff, | |
320 | enum ip_conntrack_info ctinfo, | |
76108cea | 321 | u_int8_t pf, |
2c8503f5 PNA |
322 | unsigned int hooknum, |
323 | unsigned int *timeouts) | |
9fb9cbb1 | 324 | { |
efe9f68a | 325 | enum sctp_conntrack new_state, old_state; |
8528819a | 326 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
12c33aa2 JE |
327 | const struct sctphdr *sh; |
328 | struct sctphdr _sctph; | |
329 | const struct sctp_chunkhdr *sch; | |
330 | struct sctp_chunkhdr _sch; | |
9fb9cbb1 | 331 | u_int32_t offset, count; |
35c6d3cb | 332 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
9fb9cbb1 | 333 | |
9fb9cbb1 YK |
334 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
335 | if (sh == NULL) | |
b37e933a | 336 | goto out; |
9fb9cbb1 | 337 | |
112f35c9 | 338 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
b37e933a | 339 | goto out; |
9fb9cbb1 YK |
340 | |
341 | /* Check the verification tag (Sec 8.5) */ | |
35c6d3cb PM |
342 | if (!test_bit(SCTP_CID_INIT, map) && |
343 | !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) && | |
344 | !test_bit(SCTP_CID_COOKIE_ECHO, map) && | |
345 | !test_bit(SCTP_CID_ABORT, map) && | |
346 | !test_bit(SCTP_CID_SHUTDOWN_ACK, map) && | |
d7ee3519 MK |
347 | !test_bit(SCTP_CID_HEARTBEAT, map) && |
348 | !test_bit(SCTP_CID_HEARTBEAT_ACK, map) && | |
8528819a | 349 | sh->vtag != ct->proto.sctp.vtag[dir]) { |
0d53778e | 350 | pr_debug("Verification tag check failed\n"); |
b37e933a | 351 | goto out; |
9fb9cbb1 YK |
352 | } |
353 | ||
328bd899 | 354 | old_state = new_state = SCTP_CONNTRACK_NONE; |
440f0d58 | 355 | spin_lock_bh(&ct->lock); |
9fb9cbb1 | 356 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
9fb9cbb1 YK |
357 | /* Special cases of Verification tag check (Sec 8.5.1) */ |
358 | if (sch->type == SCTP_CID_INIT) { | |
359 | /* Sec 8.5.1 (A) */ | |
b37e933a PM |
360 | if (sh->vtag != 0) |
361 | goto out_unlock; | |
9fb9cbb1 YK |
362 | } else if (sch->type == SCTP_CID_ABORT) { |
363 | /* Sec 8.5.1 (B) */ | |
8528819a | 364 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
b37e933a PM |
365 | sh->vtag != ct->proto.sctp.vtag[!dir]) |
366 | goto out_unlock; | |
9fb9cbb1 YK |
367 | } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) { |
368 | /* Sec 8.5.1 (C) */ | |
8528819a PM |
369 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
370 | sh->vtag != ct->proto.sctp.vtag[!dir] && | |
9b1c2cfd | 371 | sch->flags & SCTP_CHUNK_FLAG_T) |
b37e933a | 372 | goto out_unlock; |
9fb9cbb1 YK |
373 | } else if (sch->type == SCTP_CID_COOKIE_ECHO) { |
374 | /* Sec 8.5.1 (D) */ | |
b37e933a PM |
375 | if (sh->vtag != ct->proto.sctp.vtag[dir]) |
376 | goto out_unlock; | |
d7ee3519 MK |
377 | } else if (sch->type == SCTP_CID_HEARTBEAT || |
378 | sch->type == SCTP_CID_HEARTBEAT_ACK) { | |
379 | if (ct->proto.sctp.vtag[dir] == 0) { | |
380 | pr_debug("Setting vtag %x for dir %d\n", | |
381 | sh->vtag, dir); | |
382 | ct->proto.sctp.vtag[dir] = sh->vtag; | |
383 | } else if (sh->vtag != ct->proto.sctp.vtag[dir]) { | |
384 | pr_debug("Verification tag check failed\n"); | |
385 | goto out_unlock; | |
386 | } | |
9fb9cbb1 YK |
387 | } |
388 | ||
efe9f68a PM |
389 | old_state = ct->proto.sctp.state; |
390 | new_state = sctp_new_state(dir, old_state, sch->type); | |
9fb9cbb1 YK |
391 | |
392 | /* Invalid */ | |
efe9f68a | 393 | if (new_state == SCTP_CONNTRACK_MAX) { |
0d53778e PM |
394 | pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u " |
395 | "conntrack=%u\n", | |
efe9f68a | 396 | dir, sch->type, old_state); |
b37e933a | 397 | goto out_unlock; |
9fb9cbb1 YK |
398 | } |
399 | ||
400 | /* If it is an INIT or an INIT ACK note down the vtag */ | |
5447d477 PM |
401 | if (sch->type == SCTP_CID_INIT || |
402 | sch->type == SCTP_CID_INIT_ACK) { | |
9fb9cbb1 YK |
403 | sctp_inithdr_t _inithdr, *ih; |
404 | ||
405 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
601e68e1 | 406 | sizeof(_inithdr), &_inithdr); |
b37e933a PM |
407 | if (ih == NULL) |
408 | goto out_unlock; | |
0d53778e | 409 | pr_debug("Setting vtag %x for dir %d\n", |
8528819a PM |
410 | ih->init_tag, !dir); |
411 | ct->proto.sctp.vtag[!dir] = ih->init_tag; | |
9fb9cbb1 YK |
412 | } |
413 | ||
efe9f68a PM |
414 | ct->proto.sctp.state = new_state; |
415 | if (old_state != new_state) | |
a71996fc | 416 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
9fb9cbb1 | 417 | } |
440f0d58 | 418 | spin_unlock_bh(&ct->lock); |
9fb9cbb1 | 419 | |
2c8503f5 | 420 | nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]); |
9fb9cbb1 | 421 | |
efe9f68a | 422 | if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED && |
8528819a | 423 | dir == IP_CT_DIR_REPLY && |
efe9f68a | 424 | new_state == SCTP_CONNTRACK_ESTABLISHED) { |
0d53778e | 425 | pr_debug("Setting assured bit\n"); |
112f35c9 | 426 | set_bit(IPS_ASSURED_BIT, &ct->status); |
858b3133 | 427 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
9fb9cbb1 YK |
428 | } |
429 | ||
430 | return NF_ACCEPT; | |
b37e933a PM |
431 | |
432 | out_unlock: | |
440f0d58 | 433 | spin_unlock_bh(&ct->lock); |
b37e933a PM |
434 | out: |
435 | return -NF_ACCEPT; | |
9fb9cbb1 YK |
436 | } |
437 | ||
438 | /* Called when a new connection for this protocol found. */ | |
09f263cd | 439 | static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb, |
2c8503f5 | 440 | unsigned int dataoff, unsigned int *timeouts) |
9fb9cbb1 | 441 | { |
efe9f68a | 442 | enum sctp_conntrack new_state; |
12c33aa2 JE |
443 | const struct sctphdr *sh; |
444 | struct sctphdr _sctph; | |
445 | const struct sctp_chunkhdr *sch; | |
446 | struct sctp_chunkhdr _sch; | |
9fb9cbb1 | 447 | u_int32_t offset, count; |
35c6d3cb | 448 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
9fb9cbb1 | 449 | |
9fb9cbb1 YK |
450 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
451 | if (sh == NULL) | |
09f263cd | 452 | return false; |
9fb9cbb1 | 453 | |
112f35c9 | 454 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
09f263cd | 455 | return false; |
9fb9cbb1 YK |
456 | |
457 | /* If an OOTB packet has any of these chunks discard (Sec 8.4) */ | |
35c6d3cb PM |
458 | if (test_bit(SCTP_CID_ABORT, map) || |
459 | test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) || | |
460 | test_bit(SCTP_CID_COOKIE_ACK, map)) | |
09f263cd | 461 | return false; |
9fb9cbb1 | 462 | |
e5fc9e7a | 463 | memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp)); |
efe9f68a | 464 | new_state = SCTP_CONNTRACK_MAX; |
9fb9cbb1 YK |
465 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
466 | /* Don't need lock here: this conntrack not in circulation yet */ | |
efe9f68a PM |
467 | new_state = sctp_new_state(IP_CT_DIR_ORIGINAL, |
468 | SCTP_CONNTRACK_NONE, sch->type); | |
9fb9cbb1 YK |
469 | |
470 | /* Invalid: delete conntrack */ | |
efe9f68a PM |
471 | if (new_state == SCTP_CONNTRACK_NONE || |
472 | new_state == SCTP_CONNTRACK_MAX) { | |
0d53778e | 473 | pr_debug("nf_conntrack_sctp: invalid new deleting.\n"); |
09f263cd | 474 | return false; |
9fb9cbb1 YK |
475 | } |
476 | ||
477 | /* Copy the vtag into the state info */ | |
478 | if (sch->type == SCTP_CID_INIT) { | |
479 | if (sh->vtag == 0) { | |
480 | sctp_inithdr_t _inithdr, *ih; | |
481 | ||
482 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
601e68e1 | 483 | sizeof(_inithdr), &_inithdr); |
9fb9cbb1 | 484 | if (ih == NULL) |
09f263cd | 485 | return false; |
9fb9cbb1 | 486 | |
0d53778e PM |
487 | pr_debug("Setting vtag %x for new conn\n", |
488 | ih->init_tag); | |
9fb9cbb1 | 489 | |
112f35c9 | 490 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
9fb9cbb1 YK |
491 | ih->init_tag; |
492 | } else { | |
493 | /* Sec 8.5.1 (A) */ | |
09f263cd | 494 | return false; |
9fb9cbb1 | 495 | } |
d7ee3519 MK |
496 | } else if (sch->type == SCTP_CID_HEARTBEAT) { |
497 | pr_debug("Setting vtag %x for secondary conntrack\n", | |
498 | sh->vtag); | |
499 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = sh->vtag; | |
9fb9cbb1 YK |
500 | } |
501 | /* If it is a shutdown ack OOTB packet, we expect a return | |
502 | shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */ | |
503 | else { | |
0d53778e PM |
504 | pr_debug("Setting vtag %x for new conn OOTB\n", |
505 | sh->vtag); | |
112f35c9 | 506 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag; |
9fb9cbb1 YK |
507 | } |
508 | ||
efe9f68a | 509 | ct->proto.sctp.state = new_state; |
9fb9cbb1 YK |
510 | } |
511 | ||
09f263cd | 512 | return true; |
9fb9cbb1 YK |
513 | } |
514 | ||
c0cd1156 | 515 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
a258860e PNA |
516 | |
517 | #include <linux/netfilter/nfnetlink.h> | |
518 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
519 | ||
520 | static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, | |
440f0d58 | 521 | struct nf_conn *ct) |
a258860e PNA |
522 | { |
523 | struct nlattr *nest_parms; | |
524 | ||
440f0d58 | 525 | spin_lock_bh(&ct->lock); |
a258860e PNA |
526 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED); |
527 | if (!nest_parms) | |
528 | goto nla_put_failure; | |
529 | ||
5e8d1eb5 DM |
530 | if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state) || |
531 | nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL, | |
532 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) || | |
533 | nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY, | |
534 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY])) | |
535 | goto nla_put_failure; | |
a258860e | 536 | |
440f0d58 | 537 | spin_unlock_bh(&ct->lock); |
a258860e PNA |
538 | |
539 | nla_nest_end(skb, nest_parms); | |
540 | ||
541 | return 0; | |
542 | ||
543 | nla_put_failure: | |
440f0d58 | 544 | spin_unlock_bh(&ct->lock); |
a258860e PNA |
545 | return -1; |
546 | } | |
547 | ||
548 | static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = { | |
549 | [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 }, | |
550 | [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 }, | |
551 | [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 }, | |
552 | }; | |
553 | ||
554 | static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct) | |
555 | { | |
556 | struct nlattr *attr = cda[CTA_PROTOINFO_SCTP]; | |
557 | struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1]; | |
558 | int err; | |
559 | ||
560 | /* updates may not contain the internal protocol info, skip parsing */ | |
561 | if (!attr) | |
562 | return 0; | |
563 | ||
564 | err = nla_parse_nested(tb, | |
565 | CTA_PROTOINFO_SCTP_MAX, | |
566 | attr, | |
567 | sctp_nla_policy); | |
568 | if (err < 0) | |
569 | return err; | |
570 | ||
571 | if (!tb[CTA_PROTOINFO_SCTP_STATE] || | |
572 | !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] || | |
573 | !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]) | |
574 | return -EINVAL; | |
575 | ||
440f0d58 | 576 | spin_lock_bh(&ct->lock); |
a258860e PNA |
577 | ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]); |
578 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = | |
5547cd0a | 579 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]); |
a258860e | 580 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
5547cd0a | 581 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]); |
440f0d58 | 582 | spin_unlock_bh(&ct->lock); |
a258860e PNA |
583 | |
584 | return 0; | |
585 | } | |
a400c30e HE |
586 | |
587 | static int sctp_nlattr_size(void) | |
588 | { | |
589 | return nla_total_size(0) /* CTA_PROTOINFO_SCTP */ | |
590 | + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1); | |
591 | } | |
a258860e PNA |
592 | #endif |
593 | ||
50978462 PNA |
594 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
595 | ||
596 | #include <linux/netfilter/nfnetlink.h> | |
597 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
598 | ||
8264deb8 G |
599 | static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[], |
600 | struct net *net, void *data) | |
50978462 PNA |
601 | { |
602 | unsigned int *timeouts = data; | |
8264deb8 | 603 | struct sctp_net *sn = sctp_pernet(net); |
50978462 PNA |
604 | int i; |
605 | ||
606 | /* set default SCTP timeouts. */ | |
607 | for (i=0; i<SCTP_CONNTRACK_MAX; i++) | |
8264deb8 | 608 | timeouts[i] = sn->timeouts[i]; |
50978462 PNA |
609 | |
610 | /* there's a 1:1 mapping between attributes and protocol states. */ | |
611 | for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) { | |
612 | if (tb[i]) { | |
613 | timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ; | |
614 | } | |
615 | } | |
616 | return 0; | |
617 | } | |
618 | ||
619 | static int | |
620 | sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) | |
621 | { | |
622 | const unsigned int *timeouts = data; | |
623 | int i; | |
624 | ||
5e8d1eb5 DM |
625 | for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) { |
626 | if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ))) | |
627 | goto nla_put_failure; | |
628 | } | |
50978462 PNA |
629 | return 0; |
630 | ||
631 | nla_put_failure: | |
632 | return -ENOSPC; | |
633 | } | |
634 | ||
635 | static const struct nla_policy | |
636 | sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = { | |
637 | [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 }, | |
638 | [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 }, | |
639 | [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 }, | |
640 | [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 }, | |
641 | [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 }, | |
642 | [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 }, | |
643 | [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 }, | |
d7ee3519 MK |
644 | [CTA_TIMEOUT_SCTP_HEARTBEAT_SENT] = { .type = NLA_U32 }, |
645 | [CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED] = { .type = NLA_U32 }, | |
50978462 PNA |
646 | }; |
647 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
648 | ||
649 | ||
9fb9cbb1 | 650 | #ifdef CONFIG_SYSCTL |
933a41e7 | 651 | static struct ctl_table sctp_sysctl_table[] = { |
9fb9cbb1 | 652 | { |
9fb9cbb1 | 653 | .procname = "nf_conntrack_sctp_timeout_closed", |
9fb9cbb1 YK |
654 | .maxlen = sizeof(unsigned int), |
655 | .mode = 0644, | |
6d9f239a | 656 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
657 | }, |
658 | { | |
9fb9cbb1 | 659 | .procname = "nf_conntrack_sctp_timeout_cookie_wait", |
9fb9cbb1 YK |
660 | .maxlen = sizeof(unsigned int), |
661 | .mode = 0644, | |
6d9f239a | 662 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
663 | }, |
664 | { | |
9fb9cbb1 | 665 | .procname = "nf_conntrack_sctp_timeout_cookie_echoed", |
9fb9cbb1 YK |
666 | .maxlen = sizeof(unsigned int), |
667 | .mode = 0644, | |
6d9f239a | 668 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
669 | }, |
670 | { | |
9fb9cbb1 | 671 | .procname = "nf_conntrack_sctp_timeout_established", |
9fb9cbb1 YK |
672 | .maxlen = sizeof(unsigned int), |
673 | .mode = 0644, | |
6d9f239a | 674 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
675 | }, |
676 | { | |
9fb9cbb1 | 677 | .procname = "nf_conntrack_sctp_timeout_shutdown_sent", |
9fb9cbb1 YK |
678 | .maxlen = sizeof(unsigned int), |
679 | .mode = 0644, | |
6d9f239a | 680 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
681 | }, |
682 | { | |
9fb9cbb1 | 683 | .procname = "nf_conntrack_sctp_timeout_shutdown_recd", |
9fb9cbb1 YK |
684 | .maxlen = sizeof(unsigned int), |
685 | .mode = 0644, | |
6d9f239a | 686 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
687 | }, |
688 | { | |
9fb9cbb1 | 689 | .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent", |
9fb9cbb1 YK |
690 | .maxlen = sizeof(unsigned int), |
691 | .mode = 0644, | |
6d9f239a | 692 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 | 693 | }, |
d7ee3519 MK |
694 | { |
695 | .procname = "nf_conntrack_sctp_timeout_heartbeat_sent", | |
696 | .maxlen = sizeof(unsigned int), | |
697 | .mode = 0644, | |
698 | .proc_handler = proc_dointvec_jiffies, | |
699 | }, | |
700 | { | |
701 | .procname = "nf_conntrack_sctp_timeout_heartbeat_acked", | |
702 | .maxlen = sizeof(unsigned int), | |
703 | .mode = 0644, | |
704 | .proc_handler = proc_dointvec_jiffies, | |
705 | }, | |
f8572d8f | 706 | { } |
9fb9cbb1 | 707 | }; |
933a41e7 | 708 | #endif |
9fb9cbb1 | 709 | |
f42c4183 G |
710 | static int sctp_kmemdup_sysctl_table(struct nf_proto_net *pn, |
711 | struct sctp_net *sn) | |
49d485a3 G |
712 | { |
713 | #ifdef CONFIG_SYSCTL | |
49d485a3 G |
714 | if (pn->ctl_table) |
715 | return 0; | |
716 | ||
717 | pn->ctl_table = kmemdup(sctp_sysctl_table, | |
718 | sizeof(sctp_sysctl_table), | |
719 | GFP_KERNEL); | |
720 | if (!pn->ctl_table) | |
721 | return -ENOMEM; | |
722 | ||
723 | pn->ctl_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED]; | |
724 | pn->ctl_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT]; | |
725 | pn->ctl_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED]; | |
726 | pn->ctl_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED]; | |
727 | pn->ctl_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT]; | |
728 | pn->ctl_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD]; | |
729 | pn->ctl_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]; | |
d7ee3519 MK |
730 | pn->ctl_table[7].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_SENT]; |
731 | pn->ctl_table[8].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_ACKED]; | |
49d485a3 G |
732 | #endif |
733 | return 0; | |
734 | } | |
735 | ||
f42c4183 | 736 | static int sctp_init_net(struct net *net, u_int16_t proto) |
49d485a3 | 737 | { |
49d485a3 | 738 | struct sctp_net *sn = sctp_pernet(net); |
f42c4183 | 739 | struct nf_proto_net *pn = &sn->pn; |
49d485a3 | 740 | |
f42c4183 G |
741 | if (!pn->users) { |
742 | int i; | |
49d485a3 | 743 | |
f42c4183 G |
744 | for (i = 0; i < SCTP_CONNTRACK_MAX; i++) |
745 | sn->timeouts[i] = sctp_timeouts[i]; | |
746 | } | |
49d485a3 | 747 | |
adf05168 | 748 | return sctp_kmemdup_sysctl_table(pn, sn); |
49d485a3 G |
749 | } |
750 | ||
61075af5 | 751 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = { |
933a41e7 PM |
752 | .l3proto = PF_INET, |
753 | .l4proto = IPPROTO_SCTP, | |
754 | .name = "sctp", | |
755 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
756 | .invert_tuple = sctp_invert_tuple, | |
757 | .print_tuple = sctp_print_tuple, | |
758 | .print_conntrack = sctp_print_conntrack, | |
759 | .packet = sctp_packet, | |
2c8503f5 | 760 | .get_timeouts = sctp_get_timeouts, |
933a41e7 PM |
761 | .new = sctp_new, |
762 | .me = THIS_MODULE, | |
c0cd1156 | 763 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
a258860e | 764 | .to_nlattr = sctp_to_nlattr, |
a400c30e | 765 | .nlattr_size = sctp_nlattr_size, |
a258860e | 766 | .from_nlattr = nlattr_to_sctp, |
c7212e9d | 767 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
a400c30e | 768 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
c7212e9d PNA |
769 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
770 | .nla_policy = nf_ct_port_nla_policy, | |
771 | #endif | |
50978462 PNA |
772 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
773 | .ctnl_timeout = { | |
774 | .nlattr_to_obj = sctp_timeout_nlattr_to_obj, | |
775 | .obj_to_nlattr = sctp_timeout_obj_to_nlattr, | |
776 | .nlattr_max = CTA_TIMEOUT_SCTP_MAX, | |
777 | .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX, | |
778 | .nla_policy = sctp_timeout_nla_policy, | |
779 | }, | |
780 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
49d485a3 | 781 | .net_id = &sctp_net_id, |
f42c4183 | 782 | .init_net = sctp_init_net, |
9fb9cbb1 YK |
783 | }; |
784 | ||
61075af5 | 785 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = { |
933a41e7 PM |
786 | .l3proto = PF_INET6, |
787 | .l4proto = IPPROTO_SCTP, | |
788 | .name = "sctp", | |
789 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
790 | .invert_tuple = sctp_invert_tuple, | |
791 | .print_tuple = sctp_print_tuple, | |
792 | .print_conntrack = sctp_print_conntrack, | |
793 | .packet = sctp_packet, | |
2c8503f5 | 794 | .get_timeouts = sctp_get_timeouts, |
933a41e7 PM |
795 | .new = sctp_new, |
796 | .me = THIS_MODULE, | |
c0cd1156 | 797 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
a258860e | 798 | .to_nlattr = sctp_to_nlattr, |
a400c30e | 799 | .nlattr_size = sctp_nlattr_size, |
a258860e | 800 | .from_nlattr = nlattr_to_sctp, |
c7212e9d | 801 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
a400c30e | 802 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
c7212e9d PNA |
803 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
804 | .nla_policy = nf_ct_port_nla_policy, | |
50978462 PNA |
805 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
806 | .ctnl_timeout = { | |
807 | .nlattr_to_obj = sctp_timeout_nlattr_to_obj, | |
808 | .obj_to_nlattr = sctp_timeout_obj_to_nlattr, | |
809 | .nlattr_max = CTA_TIMEOUT_SCTP_MAX, | |
810 | .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX, | |
811 | .nla_policy = sctp_timeout_nla_policy, | |
812 | }, | |
813 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ | |
9fb9cbb1 | 814 | #endif |
49d485a3 | 815 | .net_id = &sctp_net_id, |
f42c4183 | 816 | .init_net = sctp_init_net, |
933a41e7 | 817 | }; |
9fb9cbb1 | 818 | |
49d485a3 | 819 | static int sctp_net_init(struct net *net) |
9fb9cbb1 | 820 | { |
49d485a3 | 821 | int ret = 0; |
9fb9cbb1 | 822 | |
c296bb4d | 823 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_sctp4); |
49d485a3 | 824 | if (ret < 0) { |
c296bb4d | 825 | pr_err("nf_conntrack_sctp4: pernet registration failed.\n"); |
9fb9cbb1 YK |
826 | goto out; |
827 | } | |
c296bb4d | 828 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_sctp6); |
49d485a3 | 829 | if (ret < 0) { |
c296bb4d | 830 | pr_err("nf_conntrack_sctp6: pernet registration failed.\n"); |
9fb9cbb1 YK |
831 | goto cleanup_sctp4; |
832 | } | |
49d485a3 | 833 | return 0; |
9fb9cbb1 | 834 | |
49d485a3 | 835 | cleanup_sctp4: |
c296bb4d | 836 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp4); |
49d485a3 | 837 | out: |
9fb9cbb1 | 838 | return ret; |
49d485a3 | 839 | } |
9fb9cbb1 | 840 | |
49d485a3 G |
841 | static void sctp_net_exit(struct net *net) |
842 | { | |
c296bb4d G |
843 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp6); |
844 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp4); | |
49d485a3 G |
845 | } |
846 | ||
847 | static struct pernet_operations sctp_net_ops = { | |
848 | .init = sctp_net_init, | |
849 | .exit = sctp_net_exit, | |
850 | .id = &sctp_net_id, | |
851 | .size = sizeof(struct sctp_net), | |
852 | }; | |
853 | ||
854 | static int __init nf_conntrack_proto_sctp_init(void) | |
855 | { | |
c296bb4d G |
856 | int ret; |
857 | ||
0d98da5d G |
858 | ret = register_pernet_subsys(&sctp_net_ops); |
859 | if (ret < 0) | |
860 | goto out_pernet; | |
861 | ||
c296bb4d G |
862 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp4); |
863 | if (ret < 0) | |
864 | goto out_sctp4; | |
865 | ||
866 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp6); | |
867 | if (ret < 0) | |
868 | goto out_sctp6; | |
869 | ||
c296bb4d | 870 | return 0; |
c296bb4d G |
871 | out_sctp6: |
872 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4); | |
873 | out_sctp4: | |
0d98da5d G |
874 | unregister_pernet_subsys(&sctp_net_ops); |
875 | out_pernet: | |
c296bb4d | 876 | return ret; |
9fb9cbb1 YK |
877 | } |
878 | ||
2f0d2f10 | 879 | static void __exit nf_conntrack_proto_sctp_fini(void) |
9fb9cbb1 | 880 | { |
c296bb4d G |
881 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp6); |
882 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4); | |
49d485a3 | 883 | unregister_pernet_subsys(&sctp_net_ops); |
9fb9cbb1 YK |
884 | } |
885 | ||
65b4b4e8 AM |
886 | module_init(nf_conntrack_proto_sctp_init); |
887 | module_exit(nf_conntrack_proto_sctp_fini); | |
9fb9cbb1 YK |
888 | |
889 | MODULE_LICENSE("GPL"); | |
890 | MODULE_AUTHOR("Kiran Kumar Immidi"); | |
891 | MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP"); | |
d2483dde | 892 | MODULE_ALIAS("ip_conntrack_proto_sctp"); |