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> | |
9fb9cbb1 YK |
18 | #include <linux/in.h> |
19 | #include <linux/ip.h> | |
20 | #include <linux/sctp.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/seq_file.h> | |
40a839fd YK |
23 | #include <linux/spinlock.h> |
24 | #include <linux/interrupt.h> | |
cf6e007e | 25 | #include <net/sctp/checksum.h> |
9fb9cbb1 | 26 | |
cf6e007e | 27 | #include <net/netfilter/nf_log.h> |
9fb9cbb1 | 28 | #include <net/netfilter/nf_conntrack.h> |
605dcad6 | 29 | #include <net/netfilter/nf_conntrack_l4proto.h> |
f6180121 | 30 | #include <net/netfilter/nf_conntrack_ecache.h> |
c779e849 | 31 | #include <net/netfilter/nf_conntrack_timeout.h> |
9fb9cbb1 | 32 | |
9fb9cbb1 | 33 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more |
601e68e1 | 34 | closely. They're more complex. --RR |
9fb9cbb1 YK |
35 | |
36 | And so for me for SCTP :D -Kiran */ | |
37 | ||
12c33aa2 | 38 | static const char *const sctp_conntrack_names[] = { |
9fb9cbb1 YK |
39 | "NONE", |
40 | "CLOSED", | |
41 | "COOKIE_WAIT", | |
42 | "COOKIE_ECHOED", | |
43 | "ESTABLISHED", | |
44 | "SHUTDOWN_SENT", | |
45 | "SHUTDOWN_RECD", | |
46 | "SHUTDOWN_ACK_SENT", | |
d7ee3519 MK |
47 | "HEARTBEAT_SENT", |
48 | "HEARTBEAT_ACKED", | |
9fb9cbb1 YK |
49 | }; |
50 | ||
51 | #define SECS * HZ | |
52 | #define MINS * 60 SECS | |
53 | #define HOURS * 60 MINS | |
54 | #define DAYS * 24 HOURS | |
55 | ||
2c9e8637 | 56 | static const unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] = { |
86c0bf40 PM |
57 | [SCTP_CONNTRACK_CLOSED] = 10 SECS, |
58 | [SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS, | |
59 | [SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS, | |
60 | [SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS, | |
61 | [SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000, | |
62 | [SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000, | |
63 | [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS, | |
d7ee3519 MK |
64 | [SCTP_CONNTRACK_HEARTBEAT_SENT] = 30 SECS, |
65 | [SCTP_CONNTRACK_HEARTBEAT_ACKED] = 210 SECS, | |
86c0bf40 | 66 | }; |
9fb9cbb1 YK |
67 | |
68 | #define sNO SCTP_CONNTRACK_NONE | |
69 | #define sCL SCTP_CONNTRACK_CLOSED | |
70 | #define sCW SCTP_CONNTRACK_COOKIE_WAIT | |
71 | #define sCE SCTP_CONNTRACK_COOKIE_ECHOED | |
72 | #define sES SCTP_CONNTRACK_ESTABLISHED | |
73 | #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT | |
74 | #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD | |
75 | #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT | |
d7ee3519 MK |
76 | #define sHS SCTP_CONNTRACK_HEARTBEAT_SENT |
77 | #define sHA SCTP_CONNTRACK_HEARTBEAT_ACKED | |
9fb9cbb1 YK |
78 | #define sIV SCTP_CONNTRACK_MAX |
79 | ||
601e68e1 | 80 | /* |
9fb9cbb1 YK |
81 | These are the descriptions of the states: |
82 | ||
601e68e1 | 83 | NOTE: These state names are tantalizingly similar to the states of an |
9fb9cbb1 | 84 | SCTP endpoint. But the interpretation of the states is a little different, |
601e68e1 | 85 | considering that these are the states of the connection and not of an end |
9fb9cbb1 YK |
86 | point. Please note the subtleties. -Kiran |
87 | ||
88 | NONE - Nothing so far. | |
601e68e1 YH |
89 | COOKIE WAIT - We have seen an INIT chunk in the original direction, or also |
90 | an INIT_ACK chunk in the reply direction. | |
9fb9cbb1 YK |
91 | COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction. |
92 | ESTABLISHED - We have seen a COOKIE_ACK in the reply direction. | |
93 | SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction. | |
94 | SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin. | |
95 | SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite | |
601e68e1 YH |
96 | to that of the SHUTDOWN chunk. |
97 | CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of | |
98 | the SHUTDOWN chunk. Connection is closed. | |
d7ee3519 MK |
99 | HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow. |
100 | HEARTBEAT_ACKED - We have seen a HEARTBEAT-ACK in the direction opposite to | |
101 | that of the HEARTBEAT chunk. Secondary connection is | |
102 | established. | |
9fb9cbb1 YK |
103 | */ |
104 | ||
105 | /* TODO | |
601e68e1 | 106 | - I have assumed that the first INIT is in the original direction. |
9fb9cbb1 YK |
107 | This messes things when an INIT comes in the reply direction in CLOSED |
108 | state. | |
601e68e1 | 109 | - Check the error type in the reply dir before transitioning from |
9fb9cbb1 YK |
110 | cookie echoed to closed. |
111 | - Sec 5.2.4 of RFC 2960 | |
d7ee3519 | 112 | - Full Multi Homing support. |
9fb9cbb1 YK |
113 | */ |
114 | ||
115 | /* SCTP conntrack state transitions */ | |
d7ee3519 | 116 | static const u8 sctp_conntracks[2][11][SCTP_CONNTRACK_MAX] = { |
9fb9cbb1 YK |
117 | { |
118 | /* ORIGINAL */ | |
d7ee3519 MK |
119 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */ |
120 | /* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA, sCW, sHA}, | |
121 | /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA}, | |
122 | /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, | |
123 | /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA, sCL, sSS}, | |
124 | /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA, sSA, sHA}, | |
125 | /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't have Stale cookie*/ | |
126 | /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* 5.2.4 - Big TODO */ | |
127 | /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't come in orig dir */ | |
128 | /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL, sCL, sHA}, | |
129 | /* heartbeat */ {sHS, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA}, | |
130 | /* heartbeat_ack*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA} | |
9fb9cbb1 YK |
131 | }, |
132 | { | |
133 | /* REPLY */ | |
d7ee3519 MK |
134 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */ |
135 | /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* INIT in sCL Big TODO */ | |
136 | /* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA}, | |
137 | /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV, sCL}, | |
138 | /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA, sIV, sSR}, | |
139 | /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA, sIV, sHA}, | |
140 | /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA, sIV, sHA}, | |
141 | /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* Can't come in reply dir */ | |
142 | /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA, sIV, sHA}, | |
143 | /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL, sIV, sHA}, | |
144 | /* heartbeat */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA}, | |
145 | /* heartbeat_ack*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHA, sHA} | |
9fb9cbb1 YK |
146 | } |
147 | }; | |
148 | ||
ea48cc83 | 149 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
9fb9cbb1 | 150 | /* Print out the private part of the conntrack. */ |
37246a58 | 151 | static void sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
9fb9cbb1 | 152 | { |
a163f2cb | 153 | seq_printf(s, "%s ", sctp_conntrack_names[ct->proto.sctp.state]); |
9fb9cbb1 | 154 | } |
ea48cc83 | 155 | #endif |
9fb9cbb1 YK |
156 | |
157 | #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \ | |
ae146d9b | 158 | for ((offset) = (dataoff) + sizeof(struct sctphdr), (count) = 0; \ |
e79ec50b JE |
159 | (offset) < (skb)->len && \ |
160 | ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \ | |
161 | (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++) | |
9fb9cbb1 YK |
162 | |
163 | /* Some validity checks to make sure the chunks are fine */ | |
112f35c9 | 164 | static int do_basic_checks(struct nf_conn *ct, |
9fb9cbb1 YK |
165 | const struct sk_buff *skb, |
166 | unsigned int dataoff, | |
35c6d3cb | 167 | unsigned long *map) |
9fb9cbb1 YK |
168 | { |
169 | u_int32_t offset, count; | |
922dbc5b | 170 | struct sctp_chunkhdr _sch, *sch; |
9fb9cbb1 YK |
171 | int flag; |
172 | ||
9fb9cbb1 YK |
173 | flag = 0; |
174 | ||
175 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { | |
0d53778e | 176 | pr_debug("Chunk Num: %d Type: %d\n", count, sch->type); |
9fb9cbb1 | 177 | |
5447d477 PM |
178 | if (sch->type == SCTP_CID_INIT || |
179 | sch->type == SCTP_CID_INIT_ACK || | |
180 | sch->type == SCTP_CID_SHUTDOWN_COMPLETE) | |
9fb9cbb1 | 181 | flag = 1; |
9fb9cbb1 | 182 | |
e17df688 PM |
183 | /* |
184 | * Cookie Ack/Echo chunks not the first OR | |
185 | * Init / Init Ack / Shutdown compl chunks not the only chunks | |
186 | * OR zero-length. | |
187 | */ | |
5447d477 PM |
188 | if (((sch->type == SCTP_CID_COOKIE_ACK || |
189 | sch->type == SCTP_CID_COOKIE_ECHO || | |
190 | flag) && | |
191 | count != 0) || !sch->length) { | |
0d53778e | 192 | pr_debug("Basic checks failed\n"); |
9fb9cbb1 YK |
193 | return 1; |
194 | } | |
195 | ||
5447d477 | 196 | if (map) |
35c6d3cb | 197 | set_bit(sch->type, map); |
9fb9cbb1 YK |
198 | } |
199 | ||
0d53778e | 200 | pr_debug("Basic checks passed\n"); |
dd7271fe | 201 | return count == 0; |
9fb9cbb1 YK |
202 | } |
203 | ||
efe9f68a PM |
204 | static int sctp_new_state(enum ip_conntrack_dir dir, |
205 | enum sctp_conntrack cur_state, | |
206 | int chunk_type) | |
9fb9cbb1 YK |
207 | { |
208 | int i; | |
209 | ||
0d53778e | 210 | pr_debug("Chunk type: %d\n", chunk_type); |
9fb9cbb1 YK |
211 | |
212 | switch (chunk_type) { | |
5447d477 PM |
213 | case SCTP_CID_INIT: |
214 | pr_debug("SCTP_CID_INIT\n"); | |
215 | i = 0; | |
216 | break; | |
217 | case SCTP_CID_INIT_ACK: | |
218 | pr_debug("SCTP_CID_INIT_ACK\n"); | |
219 | i = 1; | |
220 | break; | |
221 | case SCTP_CID_ABORT: | |
222 | pr_debug("SCTP_CID_ABORT\n"); | |
223 | i = 2; | |
224 | break; | |
225 | case SCTP_CID_SHUTDOWN: | |
226 | pr_debug("SCTP_CID_SHUTDOWN\n"); | |
227 | i = 3; | |
228 | break; | |
229 | case SCTP_CID_SHUTDOWN_ACK: | |
230 | pr_debug("SCTP_CID_SHUTDOWN_ACK\n"); | |
231 | i = 4; | |
232 | break; | |
233 | case SCTP_CID_ERROR: | |
234 | pr_debug("SCTP_CID_ERROR\n"); | |
235 | i = 5; | |
236 | break; | |
237 | case SCTP_CID_COOKIE_ECHO: | |
238 | pr_debug("SCTP_CID_COOKIE_ECHO\n"); | |
239 | i = 6; | |
240 | break; | |
241 | case SCTP_CID_COOKIE_ACK: | |
242 | pr_debug("SCTP_CID_COOKIE_ACK\n"); | |
243 | i = 7; | |
244 | break; | |
245 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
246 | pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n"); | |
247 | i = 8; | |
248 | break; | |
d7ee3519 MK |
249 | case SCTP_CID_HEARTBEAT: |
250 | pr_debug("SCTP_CID_HEARTBEAT"); | |
251 | i = 9; | |
252 | break; | |
253 | case SCTP_CID_HEARTBEAT_ACK: | |
254 | pr_debug("SCTP_CID_HEARTBEAT_ACK"); | |
255 | i = 10; | |
256 | break; | |
5447d477 | 257 | default: |
d7ee3519 | 258 | /* Other chunks like DATA or SACK do not change the state */ |
5447d477 PM |
259 | pr_debug("Unknown chunk type, Will stay in %s\n", |
260 | sctp_conntrack_names[cur_state]); | |
261 | return cur_state; | |
9fb9cbb1 YK |
262 | } |
263 | ||
0d53778e PM |
264 | pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n", |
265 | dir, sctp_conntrack_names[cur_state], chunk_type, | |
266 | sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]); | |
9fb9cbb1 YK |
267 | |
268 | return sctp_conntracks[dir][i][cur_state]; | |
269 | } | |
270 | ||
9976fc6e FW |
271 | /* Don't need lock here: this conntrack not in circulation yet */ |
272 | static noinline bool | |
273 | sctp_new(struct nf_conn *ct, const struct sk_buff *skb, | |
274 | const struct sctphdr *sh, unsigned int dataoff) | |
275 | { | |
276 | enum sctp_conntrack new_state; | |
277 | const struct sctp_chunkhdr *sch; | |
278 | struct sctp_chunkhdr _sch; | |
279 | u32 offset, count; | |
280 | ||
281 | memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp)); | |
282 | new_state = SCTP_CONNTRACK_MAX; | |
283 | for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) { | |
284 | new_state = sctp_new_state(IP_CT_DIR_ORIGINAL, | |
285 | SCTP_CONNTRACK_NONE, sch->type); | |
286 | ||
287 | /* Invalid: delete conntrack */ | |
288 | if (new_state == SCTP_CONNTRACK_NONE || | |
289 | new_state == SCTP_CONNTRACK_MAX) { | |
290 | pr_debug("nf_conntrack_sctp: invalid new deleting.\n"); | |
291 | return false; | |
292 | } | |
293 | ||
294 | /* Copy the vtag into the state info */ | |
295 | if (sch->type == SCTP_CID_INIT) { | |
296 | struct sctp_inithdr _inithdr, *ih; | |
297 | /* Sec 8.5.1 (A) */ | |
298 | if (sh->vtag) | |
299 | return false; | |
300 | ||
301 | ih = skb_header_pointer(skb, offset + sizeof(_sch), | |
302 | sizeof(_inithdr), &_inithdr); | |
303 | if (!ih) | |
304 | return false; | |
305 | ||
306 | pr_debug("Setting vtag %x for new conn\n", | |
307 | ih->init_tag); | |
308 | ||
309 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = ih->init_tag; | |
310 | } else if (sch->type == SCTP_CID_HEARTBEAT) { | |
311 | pr_debug("Setting vtag %x for secondary conntrack\n", | |
312 | sh->vtag); | |
313 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = sh->vtag; | |
314 | } else { | |
315 | /* If it is a shutdown ack OOTB packet, we expect a return | |
316 | shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */ | |
317 | pr_debug("Setting vtag %x for new conn OOTB\n", | |
318 | sh->vtag); | |
319 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag; | |
320 | } | |
321 | ||
322 | ct->proto.sctp.state = new_state; | |
323 | } | |
324 | ||
325 | return true; | |
326 | } | |
327 | ||
0150ffba FW |
328 | static bool sctp_error(struct sk_buff *skb, |
329 | unsigned int dataoff, | |
330 | const struct nf_hook_state *state) | |
331 | { | |
332 | const struct sctphdr *sh; | |
333 | const char *logmsg; | |
334 | ||
335 | if (skb->len < dataoff + sizeof(struct sctphdr)) { | |
336 | logmsg = "nf_ct_sctp: short packet "; | |
337 | goto out_invalid; | |
338 | } | |
339 | if (state->hook == NF_INET_PRE_ROUTING && | |
340 | state->net->ct.sysctl_checksum && | |
341 | skb->ip_summed == CHECKSUM_NONE) { | |
342 | if (!skb_make_writable(skb, dataoff + sizeof(struct sctphdr))) { | |
343 | logmsg = "nf_ct_sctp: failed to read header "; | |
344 | goto out_invalid; | |
345 | } | |
346 | sh = (const struct sctphdr *)(skb->data + dataoff); | |
347 | if (sh->checksum != sctp_compute_cksum(skb, dataoff)) { | |
348 | logmsg = "nf_ct_sctp: bad CRC "; | |
349 | goto out_invalid; | |
350 | } | |
351 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
352 | } | |
353 | return false; | |
354 | out_invalid: | |
355 | nf_l4proto_log_invalid(skb, state->net, state->pf, IPPROTO_SCTP, "%s", logmsg); | |
356 | return true; | |
357 | } | |
358 | ||
b37e933a | 359 | /* Returns verdict for packet, or -NF_ACCEPT for invalid. */ |
112f35c9 | 360 | static int sctp_packet(struct nf_conn *ct, |
83d213fd | 361 | struct sk_buff *skb, |
9fb9cbb1 | 362 | unsigned int dataoff, |
93e66024 FW |
363 | enum ip_conntrack_info ctinfo, |
364 | const struct nf_hook_state *state) | |
9fb9cbb1 | 365 | { |
efe9f68a | 366 | enum sctp_conntrack new_state, old_state; |
8528819a | 367 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
12c33aa2 JE |
368 | const struct sctphdr *sh; |
369 | struct sctphdr _sctph; | |
370 | const struct sctp_chunkhdr *sch; | |
371 | struct sctp_chunkhdr _sch; | |
9fb9cbb1 | 372 | u_int32_t offset, count; |
c779e849 | 373 | unsigned int *timeouts; |
35c6d3cb | 374 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
9fb9cbb1 | 375 | |
0150ffba FW |
376 | if (sctp_error(skb, dataoff, state)) |
377 | return -NF_ACCEPT; | |
378 | ||
9fb9cbb1 YK |
379 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
380 | if (sh == NULL) | |
b37e933a | 381 | goto out; |
9fb9cbb1 | 382 | |
112f35c9 | 383 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
b37e933a | 384 | goto out; |
9fb9cbb1 | 385 | |
9976fc6e FW |
386 | if (!nf_ct_is_confirmed(ct)) { |
387 | /* If an OOTB packet has any of these chunks discard (Sec 8.4) */ | |
388 | if (test_bit(SCTP_CID_ABORT, map) || | |
389 | test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) || | |
390 | test_bit(SCTP_CID_COOKIE_ACK, map)) | |
391 | return -NF_ACCEPT; | |
392 | ||
393 | if (!sctp_new(ct, skb, sh, dataoff)) | |
394 | return -NF_ACCEPT; | |
395 | } | |
396 | ||
9fb9cbb1 | 397 | /* Check the verification tag (Sec 8.5) */ |
35c6d3cb PM |
398 | if (!test_bit(SCTP_CID_INIT, map) && |
399 | !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) && | |
400 | !test_bit(SCTP_CID_COOKIE_ECHO, map) && | |
401 | !test_bit(SCTP_CID_ABORT, map) && | |
402 | !test_bit(SCTP_CID_SHUTDOWN_ACK, map) && | |
d7ee3519 MK |
403 | !test_bit(SCTP_CID_HEARTBEAT, map) && |
404 | !test_bit(SCTP_CID_HEARTBEAT_ACK, map) && | |
8528819a | 405 | sh->vtag != ct->proto.sctp.vtag[dir]) { |
0d53778e | 406 | pr_debug("Verification tag check failed\n"); |
b37e933a | 407 | goto out; |
9fb9cbb1 YK |
408 | } |
409 | ||
328bd899 | 410 | old_state = new_state = SCTP_CONNTRACK_NONE; |
440f0d58 | 411 | spin_lock_bh(&ct->lock); |
9fb9cbb1 | 412 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
9fb9cbb1 YK |
413 | /* Special cases of Verification tag check (Sec 8.5.1) */ |
414 | if (sch->type == SCTP_CID_INIT) { | |
415 | /* Sec 8.5.1 (A) */ | |
b37e933a PM |
416 | if (sh->vtag != 0) |
417 | goto out_unlock; | |
9fb9cbb1 YK |
418 | } else if (sch->type == SCTP_CID_ABORT) { |
419 | /* Sec 8.5.1 (B) */ | |
8528819a | 420 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
b37e933a PM |
421 | sh->vtag != ct->proto.sctp.vtag[!dir]) |
422 | goto out_unlock; | |
9fb9cbb1 YK |
423 | } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) { |
424 | /* Sec 8.5.1 (C) */ | |
8528819a PM |
425 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
426 | sh->vtag != ct->proto.sctp.vtag[!dir] && | |
9b1c2cfd | 427 | sch->flags & SCTP_CHUNK_FLAG_T) |
b37e933a | 428 | goto out_unlock; |
9fb9cbb1 YK |
429 | } else if (sch->type == SCTP_CID_COOKIE_ECHO) { |
430 | /* Sec 8.5.1 (D) */ | |
b37e933a PM |
431 | if (sh->vtag != ct->proto.sctp.vtag[dir]) |
432 | goto out_unlock; | |
d7ee3519 MK |
433 | } else if (sch->type == SCTP_CID_HEARTBEAT || |
434 | sch->type == SCTP_CID_HEARTBEAT_ACK) { | |
435 | if (ct->proto.sctp.vtag[dir] == 0) { | |
436 | pr_debug("Setting vtag %x for dir %d\n", | |
437 | sh->vtag, dir); | |
438 | ct->proto.sctp.vtag[dir] = sh->vtag; | |
439 | } else if (sh->vtag != ct->proto.sctp.vtag[dir]) { | |
440 | pr_debug("Verification tag check failed\n"); | |
441 | goto out_unlock; | |
442 | } | |
9fb9cbb1 YK |
443 | } |
444 | ||
efe9f68a PM |
445 | old_state = ct->proto.sctp.state; |
446 | new_state = sctp_new_state(dir, old_state, sch->type); | |
9fb9cbb1 YK |
447 | |
448 | /* Invalid */ | |
efe9f68a | 449 | if (new_state == SCTP_CONNTRACK_MAX) { |
0d53778e PM |
450 | pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u " |
451 | "conntrack=%u\n", | |
efe9f68a | 452 | dir, sch->type, old_state); |
b37e933a | 453 | goto out_unlock; |
9fb9cbb1 YK |
454 | } |
455 | ||
456 | /* If it is an INIT or an INIT ACK note down the vtag */ | |
5447d477 PM |
457 | if (sch->type == SCTP_CID_INIT || |
458 | sch->type == SCTP_CID_INIT_ACK) { | |
4ae70c08 | 459 | struct sctp_inithdr _inithdr, *ih; |
9fb9cbb1 | 460 | |
922dbc5b | 461 | ih = skb_header_pointer(skb, offset + sizeof(_sch), |
601e68e1 | 462 | sizeof(_inithdr), &_inithdr); |
b37e933a PM |
463 | if (ih == NULL) |
464 | goto out_unlock; | |
0d53778e | 465 | pr_debug("Setting vtag %x for dir %d\n", |
8528819a PM |
466 | ih->init_tag, !dir); |
467 | ct->proto.sctp.vtag[!dir] = ih->init_tag; | |
9fb9cbb1 YK |
468 | } |
469 | ||
efe9f68a PM |
470 | ct->proto.sctp.state = new_state; |
471 | if (old_state != new_state) | |
a71996fc | 472 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
9fb9cbb1 | 473 | } |
440f0d58 | 474 | spin_unlock_bh(&ct->lock); |
9fb9cbb1 | 475 | |
c779e849 FW |
476 | timeouts = nf_ct_timeout_lookup(ct); |
477 | if (!timeouts) | |
a95a7774 | 478 | timeouts = nf_sctp_pernet(nf_ct_net(ct))->timeouts; |
c779e849 | 479 | |
2c8503f5 | 480 | nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]); |
9fb9cbb1 | 481 | |
efe9f68a | 482 | if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED && |
8528819a | 483 | dir == IP_CT_DIR_REPLY && |
efe9f68a | 484 | new_state == SCTP_CONNTRACK_ESTABLISHED) { |
0d53778e | 485 | pr_debug("Setting assured bit\n"); |
112f35c9 | 486 | set_bit(IPS_ASSURED_BIT, &ct->status); |
858b3133 | 487 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
9fb9cbb1 YK |
488 | } |
489 | ||
490 | return NF_ACCEPT; | |
b37e933a PM |
491 | |
492 | out_unlock: | |
440f0d58 | 493 | spin_unlock_bh(&ct->lock); |
b37e933a PM |
494 | out: |
495 | return -NF_ACCEPT; | |
9fb9cbb1 YK |
496 | } |
497 | ||
c6dd940b FW |
498 | static bool sctp_can_early_drop(const struct nf_conn *ct) |
499 | { | |
500 | switch (ct->proto.sctp.state) { | |
501 | case SCTP_CONNTRACK_SHUTDOWN_SENT: | |
502 | case SCTP_CONNTRACK_SHUTDOWN_RECD: | |
503 | case SCTP_CONNTRACK_SHUTDOWN_ACK_SENT: | |
504 | return true; | |
505 | default: | |
506 | break; | |
507 | } | |
508 | ||
509 | return false; | |
510 | } | |
511 | ||
c0cd1156 | 512 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
a258860e PNA |
513 | |
514 | #include <linux/netfilter/nfnetlink.h> | |
515 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
516 | ||
517 | static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, | |
440f0d58 | 518 | struct nf_conn *ct) |
a258860e PNA |
519 | { |
520 | struct nlattr *nest_parms; | |
521 | ||
440f0d58 | 522 | spin_lock_bh(&ct->lock); |
a258860e PNA |
523 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED); |
524 | if (!nest_parms) | |
525 | goto nla_put_failure; | |
526 | ||
5e8d1eb5 DM |
527 | if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state) || |
528 | nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL, | |
529 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) || | |
530 | nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY, | |
531 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY])) | |
532 | goto nla_put_failure; | |
a258860e | 533 | |
440f0d58 | 534 | spin_unlock_bh(&ct->lock); |
a258860e PNA |
535 | |
536 | nla_nest_end(skb, nest_parms); | |
537 | ||
538 | return 0; | |
539 | ||
540 | nla_put_failure: | |
440f0d58 | 541 | spin_unlock_bh(&ct->lock); |
a258860e PNA |
542 | return -1; |
543 | } | |
544 | ||
545 | static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = { | |
546 | [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 }, | |
547 | [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 }, | |
548 | [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 }, | |
549 | }; | |
550 | ||
39215846 FW |
551 | #define SCTP_NLATTR_SIZE ( \ |
552 | NLA_ALIGN(NLA_HDRLEN + 1) + \ | |
553 | NLA_ALIGN(NLA_HDRLEN + 4) + \ | |
554 | NLA_ALIGN(NLA_HDRLEN + 4)) | |
555 | ||
a258860e PNA |
556 | static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct) |
557 | { | |
558 | struct nlattr *attr = cda[CTA_PROTOINFO_SCTP]; | |
559 | struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1]; | |
560 | int err; | |
561 | ||
562 | /* updates may not contain the internal protocol info, skip parsing */ | |
563 | if (!attr) | |
564 | return 0; | |
565 | ||
fceb6435 JB |
566 | err = nla_parse_nested(tb, CTA_PROTOINFO_SCTP_MAX, attr, |
567 | sctp_nla_policy, NULL); | |
a258860e PNA |
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 | } | |
586 | #endif | |
587 | ||
a874752a | 588 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
50978462 PNA |
589 | |
590 | #include <linux/netfilter/nfnetlink.h> | |
591 | #include <linux/netfilter/nfnetlink_cttimeout.h> | |
592 | ||
8264deb8 G |
593 | static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[], |
594 | struct net *net, void *data) | |
50978462 PNA |
595 | { |
596 | unsigned int *timeouts = data; | |
a95a7774 | 597 | struct nf_sctp_net *sn = nf_sctp_pernet(net); |
50978462 PNA |
598 | int i; |
599 | ||
600 | /* set default SCTP timeouts. */ | |
601 | for (i=0; i<SCTP_CONNTRACK_MAX; i++) | |
8264deb8 | 602 | timeouts[i] = sn->timeouts[i]; |
50978462 PNA |
603 | |
604 | /* there's a 1:1 mapping between attributes and protocol states. */ | |
605 | for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) { | |
606 | if (tb[i]) { | |
607 | timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ; | |
608 | } | |
609 | } | |
ef39078d FW |
610 | |
611 | timeouts[CTA_TIMEOUT_SCTP_UNSPEC] = timeouts[CTA_TIMEOUT_SCTP_CLOSED]; | |
50978462 PNA |
612 | return 0; |
613 | } | |
614 | ||
615 | static int | |
616 | sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) | |
617 | { | |
618 | const unsigned int *timeouts = data; | |
619 | int i; | |
620 | ||
5e8d1eb5 DM |
621 | for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) { |
622 | if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ))) | |
623 | goto nla_put_failure; | |
624 | } | |
50978462 PNA |
625 | return 0; |
626 | ||
627 | nla_put_failure: | |
628 | return -ENOSPC; | |
629 | } | |
630 | ||
631 | static const struct nla_policy | |
632 | sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = { | |
633 | [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 }, | |
634 | [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 }, | |
635 | [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 }, | |
636 | [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 }, | |
637 | [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 }, | |
638 | [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 }, | |
639 | [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 }, | |
d7ee3519 MK |
640 | [CTA_TIMEOUT_SCTP_HEARTBEAT_SENT] = { .type = NLA_U32 }, |
641 | [CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED] = { .type = NLA_U32 }, | |
50978462 | 642 | }; |
a874752a | 643 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
50978462 PNA |
644 | |
645 | ||
9fb9cbb1 | 646 | #ifdef CONFIG_SYSCTL |
933a41e7 | 647 | static struct ctl_table sctp_sysctl_table[] = { |
9fb9cbb1 | 648 | { |
9fb9cbb1 | 649 | .procname = "nf_conntrack_sctp_timeout_closed", |
9fb9cbb1 YK |
650 | .maxlen = sizeof(unsigned int), |
651 | .mode = 0644, | |
6d9f239a | 652 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
653 | }, |
654 | { | |
9fb9cbb1 | 655 | .procname = "nf_conntrack_sctp_timeout_cookie_wait", |
9fb9cbb1 YK |
656 | .maxlen = sizeof(unsigned int), |
657 | .mode = 0644, | |
6d9f239a | 658 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
659 | }, |
660 | { | |
9fb9cbb1 | 661 | .procname = "nf_conntrack_sctp_timeout_cookie_echoed", |
9fb9cbb1 YK |
662 | .maxlen = sizeof(unsigned int), |
663 | .mode = 0644, | |
6d9f239a | 664 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
665 | }, |
666 | { | |
9fb9cbb1 | 667 | .procname = "nf_conntrack_sctp_timeout_established", |
9fb9cbb1 YK |
668 | .maxlen = sizeof(unsigned int), |
669 | .mode = 0644, | |
6d9f239a | 670 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
671 | }, |
672 | { | |
9fb9cbb1 | 673 | .procname = "nf_conntrack_sctp_timeout_shutdown_sent", |
9fb9cbb1 YK |
674 | .maxlen = sizeof(unsigned int), |
675 | .mode = 0644, | |
6d9f239a | 676 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
677 | }, |
678 | { | |
9fb9cbb1 | 679 | .procname = "nf_conntrack_sctp_timeout_shutdown_recd", |
9fb9cbb1 YK |
680 | .maxlen = sizeof(unsigned int), |
681 | .mode = 0644, | |
6d9f239a | 682 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
683 | }, |
684 | { | |
9fb9cbb1 | 685 | .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent", |
9fb9cbb1 YK |
686 | .maxlen = sizeof(unsigned int), |
687 | .mode = 0644, | |
6d9f239a | 688 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 | 689 | }, |
d7ee3519 MK |
690 | { |
691 | .procname = "nf_conntrack_sctp_timeout_heartbeat_sent", | |
692 | .maxlen = sizeof(unsigned int), | |
693 | .mode = 0644, | |
694 | .proc_handler = proc_dointvec_jiffies, | |
695 | }, | |
696 | { | |
697 | .procname = "nf_conntrack_sctp_timeout_heartbeat_acked", | |
698 | .maxlen = sizeof(unsigned int), | |
699 | .mode = 0644, | |
700 | .proc_handler = proc_dointvec_jiffies, | |
701 | }, | |
f8572d8f | 702 | { } |
9fb9cbb1 | 703 | }; |
933a41e7 | 704 | #endif |
9fb9cbb1 | 705 | |
f42c4183 | 706 | static int sctp_kmemdup_sysctl_table(struct nf_proto_net *pn, |
a85406af | 707 | struct nf_sctp_net *sn) |
49d485a3 G |
708 | { |
709 | #ifdef CONFIG_SYSCTL | |
49d485a3 G |
710 | if (pn->ctl_table) |
711 | return 0; | |
712 | ||
713 | pn->ctl_table = kmemdup(sctp_sysctl_table, | |
714 | sizeof(sctp_sysctl_table), | |
715 | GFP_KERNEL); | |
716 | if (!pn->ctl_table) | |
717 | return -ENOMEM; | |
718 | ||
719 | pn->ctl_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED]; | |
720 | pn->ctl_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT]; | |
721 | pn->ctl_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED]; | |
722 | pn->ctl_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED]; | |
723 | pn->ctl_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT]; | |
724 | pn->ctl_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD]; | |
725 | pn->ctl_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]; | |
d7ee3519 MK |
726 | pn->ctl_table[7].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_SENT]; |
727 | pn->ctl_table[8].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_ACKED]; | |
49d485a3 G |
728 | #endif |
729 | return 0; | |
730 | } | |
731 | ||
ca2ca6e1 | 732 | static int sctp_init_net(struct net *net) |
49d485a3 | 733 | { |
a95a7774 | 734 | struct nf_sctp_net *sn = nf_sctp_pernet(net); |
f42c4183 | 735 | struct nf_proto_net *pn = &sn->pn; |
49d485a3 | 736 | |
f42c4183 G |
737 | if (!pn->users) { |
738 | int i; | |
49d485a3 | 739 | |
f42c4183 G |
740 | for (i = 0; i < SCTP_CONNTRACK_MAX; i++) |
741 | sn->timeouts[i] = sctp_timeouts[i]; | |
ef39078d FW |
742 | |
743 | /* timeouts[0] is unused, init it so ->timeouts[0] contains | |
744 | * 'new' timeout, like udp or icmp. | |
745 | */ | |
746 | sn->timeouts[0] = sctp_timeouts[SCTP_CONNTRACK_CLOSED]; | |
f42c4183 | 747 | } |
49d485a3 | 748 | |
adf05168 | 749 | return sctp_kmemdup_sysctl_table(pn, sn); |
49d485a3 G |
750 | } |
751 | ||
deaa0a97 LZ |
752 | static struct nf_proto_net *sctp_get_net_proto(struct net *net) |
753 | { | |
754 | return &net->ct.nf_ct_proto.sctp.pn; | |
755 | } | |
756 | ||
dd2934a9 | 757 | const struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp = { |
933a41e7 | 758 | .l4proto = IPPROTO_SCTP, |
ea48cc83 | 759 | #ifdef CONFIG_NF_CONNTRACK_PROCFS |
933a41e7 | 760 | .print_conntrack = sctp_print_conntrack, |
ea48cc83 | 761 | #endif |
933a41e7 | 762 | .packet = sctp_packet, |
c6dd940b | 763 | .can_early_drop = sctp_can_early_drop, |
933a41e7 | 764 | .me = THIS_MODULE, |
c0cd1156 | 765 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
39215846 | 766 | .nlattr_size = SCTP_NLATTR_SIZE, |
a258860e PNA |
767 | .to_nlattr = sctp_to_nlattr, |
768 | .from_nlattr = nlattr_to_sctp, | |
c7212e9d | 769 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
a400c30e | 770 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
c7212e9d PNA |
771 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
772 | .nla_policy = nf_ct_port_nla_policy, | |
773 | #endif | |
a874752a | 774 | #ifdef CONFIG_NF_CONNTRACK_TIMEOUT |
50978462 PNA |
775 | .ctnl_timeout = { |
776 | .nlattr_to_obj = sctp_timeout_nlattr_to_obj, | |
777 | .obj_to_nlattr = sctp_timeout_obj_to_nlattr, | |
778 | .nlattr_max = CTA_TIMEOUT_SCTP_MAX, | |
779 | .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX, | |
780 | .nla_policy = sctp_timeout_nla_policy, | |
781 | }, | |
a874752a | 782 | #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ |
f42c4183 | 783 | .init_net = sctp_init_net, |
deaa0a97 | 784 | .get_net_proto = sctp_get_net_proto, |
9fb9cbb1 | 785 | }; |