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Merge tag 'perf-tools-fixes-for-v6.4-1-2023-05-20' of git://git.kernel.org/pub/scm...
[linux-block.git] / net / netfilter / nf_conntrack_proto_dccp.c
CommitLineData
d2912cb1 1// SPDX-License-Identifier: GPL-2.0-only
2bc78049
PM		 2/*
3 * DCCP connection tracking protocol helper
4 *
5 * Copyright (c) 2005, 2006, 2008 Patrick McHardy <kaber@trash.net>
2bc78049
PM		 6 */
7#include <linux/kernel.h>
2bc78049
PM		 8#include <linux/init.h>
9#include <linux/sysctl.h>
10#include <linux/spinlock.h>
11#include <linux/skbuff.h>
12#include <linux/dccp.h>
5a0e3ad6 13#include <linux/slab.h>
2bc78049 14
1546000f
CG		 15#include <net/net_namespace.h>
16#include <net/netns/generic.h>
17
2bc78049
PM		 18#include <linux/netfilter/nfnetlink_conntrack.h>
19#include <net/netfilter/nf_conntrack.h>
20#include <net/netfilter/nf_conntrack_l4proto.h>
b38b1f61 21#include <net/netfilter/nf_conntrack_ecache.h>
c779e849 22#include <net/netfilter/nf_conntrack_timeout.h>
2bc78049
PM		 23#include <net/netfilter/nf_log.h>
24
2bc78049
PM		 25/* Timeouts are based on values from RFC4340:
26 *
27 * - REQUEST:
28 *
29 * 8.1.2. Client Request
30 *
31 * A client MAY give up on its DCCP-Requests after some time
32 * (3 minutes, for example).
33 *
34 * - RESPOND:
35 *
36 * 8.1.3. Server Response
37 *
38 * It MAY also leave the RESPOND state for CLOSED after a timeout of
39 * not less than 4MSL (8 minutes);
40 *
41 * - PARTOPEN:
42 *
43 * 8.1.5. Handshake Completion
44 *
45 * If the client remains in PARTOPEN for more than 4MSL (8 minutes),
46 * it SHOULD reset the connection with Reset Code 2, "Aborted".
47 *
48 * - OPEN:
49 *
50 * The DCCP timestamp overflows after 11.9 hours. If the connection
51 * stays idle this long the sequence number won't be recognized
52 * as valid anymore.
53 *
54 * - CLOSEREQ/CLOSING:
55 *
56 * 8.3. Termination
57 *
58 * The retransmission timer should initially be set to go off in two
59 * round-trip times and should back off to not less than once every
60 * 64 seconds ...
61 *
62 * - TIMEWAIT:
63 *
64 * 4.3. States
65 *
66 * A server or client socket remains in this state for 2MSL (4 minutes)
67 * after the connection has been town down, ...
68 */
69
70#define DCCP_MSL (2 * 60 * HZ)
71
2bc78049
PM		 72static const char * const dccp_state_names[] = {
73 [CT_DCCP_NONE] = "NONE",
74 [CT_DCCP_REQUEST] = "REQUEST",
75 [CT_DCCP_RESPOND] = "RESPOND",
76 [CT_DCCP_PARTOPEN] = "PARTOPEN",
77 [CT_DCCP_OPEN] = "OPEN",
78 [CT_DCCP_CLOSEREQ] = "CLOSEREQ",
79 [CT_DCCP_CLOSING] = "CLOSING",
80 [CT_DCCP_TIMEWAIT] = "TIMEWAIT",
81 [CT_DCCP_IGNORE] = "IGNORE",
82 [CT_DCCP_INVALID] = "INVALID",
83};
84
85#define sNO CT_DCCP_NONE
86#define sRQ CT_DCCP_REQUEST
87#define sRS CT_DCCP_RESPOND
88#define sPO CT_DCCP_PARTOPEN
89#define sOP CT_DCCP_OPEN
90#define sCR CT_DCCP_CLOSEREQ
91#define sCG CT_DCCP_CLOSING
92#define sTW CT_DCCP_TIMEWAIT
93#define sIG CT_DCCP_IGNORE
94#define sIV CT_DCCP_INVALID
95
96/*
25985edc 97 * DCCP state transition table
2bc78049
PM		 98 *
99 * The assumption is the same as for TCP tracking:
100 *
101 * We are the man in the middle. All the packets go through us but might
102 * get lost in transit to the destination. It is assumed that the destination
103 * can't receive segments we haven't seen.
104 *
105 * The following states exist:
106 *
107 * NONE: Initial state, expecting Request
108 * REQUEST: Request seen, waiting for Response from server
109 * RESPOND: Response from server seen, waiting for Ack from client
110 * PARTOPEN: Ack after Response seen, waiting for packet other than Response,
111 * Reset or Sync from server
112 * OPEN: Packet other than Response, Reset or Sync seen
113 * CLOSEREQ: CloseReq from server seen, expecting Close from client
114 * CLOSING: Close seen, expecting Reset
115 * TIMEWAIT: Reset seen
116 * IGNORE: Not determinable whether packet is valid
117 *
118 * Some states exist only on one side of the connection: REQUEST, RESPOND,
119 * PARTOPEN, CLOSEREQ. For the other side these states are equivalent to
120 * the one it was in before.
121 *
122 * Packets are marked as ignored (sIG) if we don't know if they're valid
123 * (for example a reincarnation of a connection we didn't notice is dead
124 * already) and the server may send back a connection closing Reset or a
125 * Response. They're also used for Sync/SyncAck packets, which we don't
126 * care about.
127 */
128static const u_int8_t
129dccp_state_table[CT_DCCP_ROLE_MAX + 1][DCCP_PKT_SYNCACK + 1][CT_DCCP_MAX + 1] = {
130 [CT_DCCP_ROLE_CLIENT] = {
131 [DCCP_PKT_REQUEST] = {
132 /*
133 * sNO -> sRQ Regular Request
134 * sRQ -> sRQ Retransmitted Request or reincarnation
135 * sRS -> sRS Retransmitted Request (apparently Response
136 * got lost after we saw it) or reincarnation
137 * sPO -> sIG Ignore, conntrack might be out of sync
138 * sOP -> sIG Ignore, conntrack might be out of sync
139 * sCR -> sIG Ignore, conntrack might be out of sync
140 * sCG -> sIG Ignore, conntrack might be out of sync
141 * sTW -> sRQ Reincarnation
142 *
143 * sNO, sRQ, sRS, sPO. sOP, sCR, sCG, sTW, */
144 sRQ, sRQ, sRS, sIG, sIG, sIG, sIG, sRQ,
145 },
146 [DCCP_PKT_RESPONSE] = {
147 /*
148 * sNO -> sIV Invalid
149 * sRQ -> sIG Ignore, might be response to ignored Request
150 * sRS -> sIG Ignore, might be response to ignored Request
151 * sPO -> sIG Ignore, might be response to ignored Request
152 * sOP -> sIG Ignore, might be response to ignored Request
153 * sCR -> sIG Ignore, might be response to ignored Request
154 * sCG -> sIG Ignore, might be response to ignored Request
155 * sTW -> sIV Invalid, reincarnation in reverse direction
156 * goes through sRQ
157 *
158 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
159 sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIV,
160 },
161 [DCCP_PKT_ACK] = {
162 /*
163 * sNO -> sIV No connection
164 * sRQ -> sIV No connection
165 * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.)
166 * sPO -> sPO Retransmitted Ack for Response, remain in PARTOPEN
167 * sOP -> sOP Regular ACK, remain in OPEN
168 * sCR -> sCR Ack in CLOSEREQ MAY be processed (8.3.)
169 * sCG -> sCG Ack in CLOSING MAY be processed (8.3.)
170 * sTW -> sIV
171 *
172 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
173 sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV
174 },
175 [DCCP_PKT_DATA] = {
176 /*
177 * sNO -> sIV No connection
178 * sRQ -> sIV No connection
179 * sRS -> sIV No connection
180 * sPO -> sIV MUST use DataAck in PARTOPEN state (8.1.5.)
181 * sOP -> sOP Regular Data packet
182 * sCR -> sCR Data in CLOSEREQ MAY be processed (8.3.)
183 * sCG -> sCG Data in CLOSING MAY be processed (8.3.)
184 * sTW -> sIV
185 *
186 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
187 sIV, sIV, sIV, sIV, sOP, sCR, sCG, sIV,
188 },
189 [DCCP_PKT_DATAACK] = {
190 /*
191 * sNO -> sIV No connection
192 * sRQ -> sIV No connection
193 * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.)
194 * sPO -> sPO Remain in PARTOPEN state
195 * sOP -> sOP Regular DataAck packet in OPEN state
196 * sCR -> sCR DataAck in CLOSEREQ MAY be processed (8.3.)
197 * sCG -> sCG DataAck in CLOSING MAY be processed (8.3.)
198 * sTW -> sIV
199 *
200 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
201 sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV
202 },
203 [DCCP_PKT_CLOSEREQ] = {
204 /*
205 * CLOSEREQ may only be sent by the server.
206 *
207 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
208 sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV
209 },
210 [DCCP_PKT_CLOSE] = {
211 /*
212 * sNO -> sIV No connection
213 * sRQ -> sIV No connection
214 * sRS -> sIV No connection
215 * sPO -> sCG Client-initiated close
216 * sOP -> sCG Client-initiated close
217 * sCR -> sCG Close in response to CloseReq (8.3.)
218 * sCG -> sCG Retransmit
219 * sTW -> sIV Late retransmit, already in TIME_WAIT
220 *
221 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
222 sIV, sIV, sIV, sCG, sCG, sCG, sIV, sIV
223 },
224 [DCCP_PKT_RESET] = {
225 /*
226 * sNO -> sIV No connection
227 * sRQ -> sTW Sync received or timeout, SHOULD send Reset (8.1.1.)
228 * sRS -> sTW Response received without Request
229 * sPO -> sTW Timeout, SHOULD send Reset (8.1.5.)
230 * sOP -> sTW Connection reset
231 * sCR -> sTW Connection reset
232 * sCG -> sTW Connection reset
233 * sTW -> sIG Ignore (don't refresh timer)
234 *
235 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
236 sIV, sTW, sTW, sTW, sTW, sTW, sTW, sIG
237 },
238 [DCCP_PKT_SYNC] = {
239 /*
240 * We currently ignore Sync packets
241 *
242 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
6613b617 243 sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
2bc78049
PM		 244 },
245 [DCCP_PKT_SYNCACK] = {
246 /*
247 * We currently ignore SyncAck packets
248 *
249 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
6613b617 250 sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
2bc78049
PM		 251 },
252 },
253 [CT_DCCP_ROLE_SERVER] = {
254 [DCCP_PKT_REQUEST] = {
255 /*
256 * sNO -> sIV Invalid
257 * sRQ -> sIG Ignore, conntrack might be out of sync
258 * sRS -> sIG Ignore, conntrack might be out of sync
259 * sPO -> sIG Ignore, conntrack might be out of sync
260 * sOP -> sIG Ignore, conntrack might be out of sync
261 * sCR -> sIG Ignore, conntrack might be out of sync
262 * sCG -> sIG Ignore, conntrack might be out of sync
263 * sTW -> sRQ Reincarnation, must reverse roles
264 *
265 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
266 sIV, sIG, sIG, sIG, sIG, sIG, sIG, sRQ
267 },
268 [DCCP_PKT_RESPONSE] = {
269 /*
270 * sNO -> sIV Response without Request
271 * sRQ -> sRS Response to clients Request
272 * sRS -> sRS Retransmitted Response (8.1.3. SHOULD NOT)
273 * sPO -> sIG Response to an ignored Request or late retransmit
274 * sOP -> sIG Ignore, might be response to ignored Request
275 * sCR -> sIG Ignore, might be response to ignored Request
276 * sCG -> sIG Ignore, might be response to ignored Request
277 * sTW -> sIV Invalid, Request from client in sTW moves to sRQ
278 *
279 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
280 sIV, sRS, sRS, sIG, sIG, sIG, sIG, sIV
281 },
282 [DCCP_PKT_ACK] = {
283 /*
284 * sNO -> sIV No connection
285 * sRQ -> sIV No connection
286 * sRS -> sIV No connection
287 * sPO -> sOP Enter OPEN state (8.1.5.)
288 * sOP -> sOP Regular Ack in OPEN state
289 * sCR -> sIV Waiting for Close from client
290 * sCG -> sCG Ack in CLOSING MAY be processed (8.3.)
291 * sTW -> sIV
292 *
293 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
294 sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV
295 },
296 [DCCP_PKT_DATA] = {
297 /*
298 * sNO -> sIV No connection
299 * sRQ -> sIV No connection
300 * sRS -> sIV No connection
301 * sPO -> sOP Enter OPEN state (8.1.5.)
302 * sOP -> sOP Regular Data packet in OPEN state
303 * sCR -> sIV Waiting for Close from client
304 * sCG -> sCG Data in CLOSING MAY be processed (8.3.)
305 * sTW -> sIV
306 *
307 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
308 sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV
309 },
310 [DCCP_PKT_DATAACK] = {
311 /*
312 * sNO -> sIV No connection
313 * sRQ -> sIV No connection
314 * sRS -> sIV No connection
315 * sPO -> sOP Enter OPEN state (8.1.5.)
316 * sOP -> sOP Regular DataAck in OPEN state
317 * sCR -> sIV Waiting for Close from client
318 * sCG -> sCG Data in CLOSING MAY be processed (8.3.)
319 * sTW -> sIV
320 *
321 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
322 sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV
323 },
324 [DCCP_PKT_CLOSEREQ] = {
325 /*
326 * sNO -> sIV No connection
327 * sRQ -> sIV No connection
328 * sRS -> sIV No connection
329 * sPO -> sOP -> sCR Move directly to CLOSEREQ (8.1.5.)
330 * sOP -> sCR CloseReq in OPEN state
331 * sCR -> sCR Retransmit
332 * sCG -> sCR Simultaneous close, client sends another Close
333 * sTW -> sIV Already closed
334 *
335 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
336 sIV, sIV, sIV, sCR, sCR, sCR, sCR, sIV
337 },
338 [DCCP_PKT_CLOSE] = {
339 /*
340 * sNO -> sIV No connection
341 * sRQ -> sIV No connection
342 * sRS -> sIV No connection
343 * sPO -> sOP -> sCG Move direcly to CLOSING
344 * sOP -> sCG Move to CLOSING
345 * sCR -> sIV Close after CloseReq is invalid
346 * sCG -> sCG Retransmit
347 * sTW -> sIV Already closed
348 *
349 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
350 sIV, sIV, sIV, sCG, sCG, sIV, sCG, sIV
351 },
352 [DCCP_PKT_RESET] = {
353 /*
354 * sNO -> sIV No connection
355 * sRQ -> sTW Reset in response to Request
356 * sRS -> sTW Timeout, SHOULD send Reset (8.1.3.)
357 * sPO -> sTW Timeout, SHOULD send Reset (8.1.3.)
358 * sOP -> sTW
359 * sCR -> sTW
360 * sCG -> sTW
361 * sTW -> sIG Ignore (don't refresh timer)
362 *
363 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW, sTW */
364 sIV, sTW, sTW, sTW, sTW, sTW, sTW, sTW, sIG
365 },
366 [DCCP_PKT_SYNC] = {
367 /*
368 * We currently ignore Sync packets
369 *
370 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
6613b617 371 sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
2bc78049
PM		 372 },
373 [DCCP_PKT_SYNCACK] = {
374 /*
375 * We currently ignore SyncAck packets
376 *
377 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
6613b617 378 sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
2bc78049
PM		 379 },
380 },
381};
382
9976fc6e
FW		 383static noinline bool
384dccp_new(struct nf_conn *ct, const struct sk_buff *skb,
62eec0d7
FW		 385 const struct dccp_hdr *dh,
386 const struct nf_hook_state *hook_state)
2bc78049 387{
c2a2c7e0 388 struct net *net = nf_ct_net(ct);
c51d3901 389 struct nf_dccp_net *dn;
2bc78049
PM		 390 const char *msg;
391 u_int8_t state;
392
2bc78049
PM		 393 state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE];
394 switch (state) {
395 default:
a95a7774 396 dn = nf_dccp_pernet(net);
1546000f 397 if (dn->dccp_loose == 0) {
3d0b527b 398 msg = "not picking up existing connection ";
2bc78049
PM		 399 goto out_invalid;
400 }
c2168e6b 401 break;
2bc78049
PM		 402 case CT_DCCP_REQUEST:
403 break;
404 case CT_DCCP_INVALID:
3d0b527b 405 msg = "invalid state transition ";
2bc78049
PM		 406 goto out_invalid;
407 }
408
409 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT;
410 ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER;
411 ct->proto.dccp.state = CT_DCCP_NONE;
e5fc9e7a
CG		 412 ct->proto.dccp.last_pkt = DCCP_PKT_REQUEST;
413 ct->proto.dccp.last_dir = IP_CT_DIR_ORIGINAL;
414 ct->proto.dccp.handshake_seq = 0;
09f263cd 415 return true;
2bc78049
PM		 416
417out_invalid:
62eec0d7 418 nf_ct_l4proto_log_invalid(skb, ct, hook_state, "%s", msg);
09f263cd 419 return false;
2bc78049
PM		 420}
421
422static u64 dccp_ack_seq(const struct dccp_hdr *dh)
423{
424 const struct dccp_hdr_ack_bits *dhack;
425
426 dhack = (void *)dh + __dccp_basic_hdr_len(dh);
427 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) +
428 ntohl(dhack->dccph_ack_nr_low);
429}
430
0150ffba
FW		 431static bool dccp_error(const struct dccp_hdr *dh,
432 struct sk_buff *skb, unsigned int dataoff,
433 const struct nf_hook_state *state)
434{
435 unsigned int dccp_len = skb->len - dataoff;
436 unsigned int cscov;
437 const char *msg;
438
439 if (dh->dccph_doff * 4 < sizeof(struct dccp_hdr) ||
440 dh->dccph_doff * 4 > dccp_len) {
441 msg = "nf_ct_dccp: truncated/malformed packet ";
442 goto out_invalid;
443 }
444
445 cscov = dccp_len;
446 if (dh->dccph_cscov) {
447 cscov = (dh->dccph_cscov - 1) * 4;
448 if (cscov > dccp_len) {
449 msg = "nf_ct_dccp: bad checksum coverage ";
450 goto out_invalid;
451 }
452 }
453
454 if (state->hook == NF_INET_PRE_ROUTING &&
455 state->net->ct.sysctl_checksum &&
456 nf_checksum_partial(skb, state->hook, dataoff, cscov,
457 IPPROTO_DCCP, state->pf)) {
458 msg = "nf_ct_dccp: bad checksum ";
459 goto out_invalid;
460 }
461
462 if (dh->dccph_type >= DCCP_PKT_INVALID) {
463 msg = "nf_ct_dccp: reserved packet type ";
464 goto out_invalid;
465 }
466 return false;
467out_invalid:
62eec0d7 468 nf_l4proto_log_invalid(skb, state, IPPROTO_DCCP, "%s", msg);
0150ffba
FW		 469 return true;
470}
471
a47c5404
FW		 472int nf_conntrack_dccp_packet(struct nf_conn *ct, struct sk_buff *skb,
473 unsigned int dataoff,
474 enum ip_conntrack_info ctinfo,
475 const struct nf_hook_state *state)
2bc78049
PM		 476{
477 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
478 struct dccp_hdr _dh, *dh;
479 u_int8_t type, old_state, new_state;
480 enum ct_dccp_roles role;
c779e849 481 unsigned int *timeouts;
2bc78049 482
b22f5126 483 dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
9976fc6e
FW		 484 if (!dh)
485 return NF_DROP;
486
0150ffba
FW		 487 if (dccp_error(dh, skb, dataoff, state))
488 return -NF_ACCEPT;
489
2bc78049 490 type = dh->dccph_type;
62eec0d7 491 if (!nf_ct_is_confirmed(ct) && !dccp_new(ct, skb, dh, state))
9976fc6e 492 return -NF_ACCEPT;
2bc78049
PM		 493
494 if (type == DCCP_PKT_RESET &&
495 !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
496 /* Tear down connection immediately if only reply is a RESET */
718d4ad9 497 nf_ct_kill_acct(ct, ctinfo, skb);
2bc78049
PM		 498 return NF_ACCEPT;
499 }
500
440f0d58 501 spin_lock_bh(&ct->lock);
2bc78049
PM		 502
503 role = ct->proto.dccp.role[dir];
504 old_state = ct->proto.dccp.state;
505 new_state = dccp_state_table[role][type][old_state];
506
507 switch (new_state) {
508 case CT_DCCP_REQUEST:
509 if (old_state == CT_DCCP_TIMEWAIT &&
510 role == CT_DCCP_ROLE_SERVER) {
511 /* Reincarnation in the reverse direction: reopen and
512 * reverse client/server roles. */
513 ct->proto.dccp.role[dir] = CT_DCCP_ROLE_CLIENT;
514 ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_SERVER;
515 }
516 break;
517 case CT_DCCP_RESPOND:
518 if (old_state == CT_DCCP_REQUEST)
519 ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh);
520 break;
521 case CT_DCCP_PARTOPEN:
522 if (old_state == CT_DCCP_RESPOND &&
523 type == DCCP_PKT_ACK &&
524 dccp_ack_seq(dh) == ct->proto.dccp.handshake_seq)
525 set_bit(IPS_ASSURED_BIT, &ct->status);
526 break;
527 case CT_DCCP_IGNORE:
528 /*
529 * Connection tracking might be out of sync, so we ignore
530 * packets that might establish a new connection and resync
531 * if the server responds with a valid Response.
532 */
533 if (ct->proto.dccp.last_dir == !dir &&
534 ct->proto.dccp.last_pkt == DCCP_PKT_REQUEST &&
535 type == DCCP_PKT_RESPONSE) {
536 ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_CLIENT;
537 ct->proto.dccp.role[dir] = CT_DCCP_ROLE_SERVER;
538 ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh);
539 new_state = CT_DCCP_RESPOND;
540 break;
541 }
542 ct->proto.dccp.last_dir = dir;
543 ct->proto.dccp.last_pkt = type;
544
440f0d58 545 spin_unlock_bh(&ct->lock);
62eec0d7 546 nf_ct_l4proto_log_invalid(skb, ct, state, "%s", "invalid packet");
2bc78049
PM		 547 return NF_ACCEPT;
548 case CT_DCCP_INVALID:
440f0d58 549 spin_unlock_bh(&ct->lock);
62eec0d7 550 nf_ct_l4proto_log_invalid(skb, ct, state, "%s", "invalid state transition");
2bc78049
PM		 551 return -NF_ACCEPT;
552 }
553
554 ct->proto.dccp.last_dir = dir;
555 ct->proto.dccp.last_pkt = type;
556 ct->proto.dccp.state = new_state;
440f0d58 557 spin_unlock_bh(&ct->lock);
1546000f 558
b38b1f61
PNA		 559 if (new_state != old_state)
560 nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
561
c779e849
FW		 562 timeouts = nf_ct_timeout_lookup(ct);
563 if (!timeouts)
a95a7774 564 timeouts = nf_dccp_pernet(nf_ct_net(ct))->dccp_timeout;
2c8503f5 565 nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]);
2bc78049
PM		 566
567 return NF_ACCEPT;
568}
569
c6dd940b
FW		 570static bool dccp_can_early_drop(const struct nf_conn *ct)
571{
572 switch (ct->proto.dccp.state) {
573 case CT_DCCP_CLOSEREQ:
574 case CT_DCCP_CLOSING:
575 case CT_DCCP_TIMEWAIT:
576 return true;
577 default:
578 break;
579 }
580
581 return false;
582}
583
ea48cc83 584#ifdef CONFIG_NF_CONNTRACK_PROCFS
37246a58 585static void dccp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
2bc78049 586{
37246a58 587 seq_printf(s, "%s ", dccp_state_names[ct->proto.dccp.state]);
2bc78049 588}
ea48cc83 589#endif
2bc78049 590
c0cd1156 591#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
2bc78049 592static int dccp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
86d21fc7 593 struct nf_conn *ct, bool destroy)
2bc78049
PM		 594{
595 struct nlattr *nest_parms;
596
440f0d58 597 spin_lock_bh(&ct->lock);
ae0be8de 598 nest_parms = nla_nest_start(skb, CTA_PROTOINFO_DCCP);
2bc78049
PM		 599 if (!nest_parms)
600 goto nla_put_failure;
86d21fc7
FW		 601 if (nla_put_u8(skb, CTA_PROTOINFO_DCCP_STATE, ct->proto.dccp.state))
602 goto nla_put_failure;
603
604 if (destroy)
605 goto skip_state;
606
607 if (nla_put_u8(skb, CTA_PROTOINFO_DCCP_ROLE,
516ee48f
DM		 608 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL]) ||
609 nla_put_be64(skb, CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ,
b46f6ded
ND		 610 cpu_to_be64(ct->proto.dccp.handshake_seq),
611 CTA_PROTOINFO_DCCP_PAD))
516ee48f 612 goto nla_put_failure;
86d21fc7 613skip_state:
2bc78049 614 nla_nest_end(skb, nest_parms);
440f0d58 615 spin_unlock_bh(&ct->lock);
86d21fc7 616
2bc78049
PM		 617 return 0;
618
619nla_put_failure:
440f0d58 620 spin_unlock_bh(&ct->lock);
2bc78049
PM		 621 return -1;
622}
623
624static const struct nla_policy dccp_nla_policy[CTA_PROTOINFO_DCCP_MAX + 1] = {
625 [CTA_PROTOINFO_DCCP_STATE] = { .type = NLA_U8 },
71951b64 626 [CTA_PROTOINFO_DCCP_ROLE] = { .type = NLA_U8 },
a17c8598 627 [CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ] = { .type = NLA_U64 },
b46f6ded 628 [CTA_PROTOINFO_DCCP_PAD] = { .type = NLA_UNSPEC },
2bc78049
PM		 629};
630
39215846
FW		 631#define DCCP_NLATTR_SIZE ( \
632 NLA_ALIGN(NLA_HDRLEN + 1) + \
633 NLA_ALIGN(NLA_HDRLEN + 1) + \
634 NLA_ALIGN(NLA_HDRLEN + sizeof(u64)) + \
635 NLA_ALIGN(NLA_HDRLEN + 0))
636
2bc78049
PM		 637static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct)
638{
639 struct nlattr *attr = cda[CTA_PROTOINFO_DCCP];
640 struct nlattr *tb[CTA_PROTOINFO_DCCP_MAX + 1];
641 int err;
642
643 if (!attr)
644 return 0;
645
8cb08174
JB		 646 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_DCCP_MAX, attr,
647 dccp_nla_policy, NULL);
2bc78049
PM		 648 if (err < 0)
649 return err;
650
651 if (!tb[CTA_PROTOINFO_DCCP_STATE] ||
71951b64
PNA		 652 !tb[CTA_PROTOINFO_DCCP_ROLE] ||
653 nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) > CT_DCCP_ROLE_MAX ||
654 nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]) >= CT_DCCP_IGNORE) {
2bc78049 655 return -EINVAL;
71951b64 656 }
2bc78049 657
440f0d58 658 spin_lock_bh(&ct->lock);
2bc78049 659 ct->proto.dccp.state = nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]);
71951b64
PNA		 660 if (nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) == CT_DCCP_ROLE_CLIENT) {
661 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT;
662 ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER;
663 } else {
664 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_SERVER;
665 ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_CLIENT;
666 }
a17c8598
PNA		 667 if (tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]) {
668 ct->proto.dccp.handshake_seq =
669 be64_to_cpu(nla_get_be64(tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]));
670 }
440f0d58 671 spin_unlock_bh(&ct->lock);
2bc78049
PM		 672 return 0;
673}
674#endif
675
a874752a 676#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
50978462
PNA		 677
678#include <linux/netfilter/nfnetlink.h>
679#include <linux/netfilter/nfnetlink_cttimeout.h>
680
8264deb8
G		 681static int dccp_timeout_nlattr_to_obj(struct nlattr *tb[],
682 struct net *net, void *data)
50978462 683{
a95a7774 684 struct nf_dccp_net *dn = nf_dccp_pernet(net);
50978462
PNA		 685 unsigned int *timeouts = data;
686 int i;
687
1d9a7acd
FW		 688 if (!timeouts)
689 timeouts = dn->dccp_timeout;
690
50978462
PNA		 691 /* set default DCCP timeouts. */
692 for (i=0; i<CT_DCCP_MAX; i++)
693 timeouts[i] = dn->dccp_timeout[i];
694
695 /* there's a 1:1 mapping between attributes and protocol states. */
696 for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) {
697 if (tb[i]) {
698 timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ;
699 }
700 }
ef39078d
FW		 701
702 timeouts[CTA_TIMEOUT_DCCP_UNSPEC] = timeouts[CTA_TIMEOUT_DCCP_REQUEST];
50978462
PNA		 703 return 0;
704}
705
706static int
707dccp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
708{
709 const unsigned int *timeouts = data;
710 int i;
711
516ee48f
DM		 712 for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) {
713 if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ)))
714 goto nla_put_failure;
715 }
50978462
PNA		 716 return 0;
717
718nla_put_failure:
719 return -ENOSPC;
720}
721
722static const struct nla_policy
723dccp_timeout_nla_policy[CTA_TIMEOUT_DCCP_MAX+1] = {
724 [CTA_TIMEOUT_DCCP_REQUEST] = { .type = NLA_U32 },
725 [CTA_TIMEOUT_DCCP_RESPOND] = { .type = NLA_U32 },
726 [CTA_TIMEOUT_DCCP_PARTOPEN] = { .type = NLA_U32 },
727 [CTA_TIMEOUT_DCCP_OPEN] = { .type = NLA_U32 },
728 [CTA_TIMEOUT_DCCP_CLOSEREQ] = { .type = NLA_U32 },
729 [CTA_TIMEOUT_DCCP_CLOSING] = { .type = NLA_U32 },
730 [CTA_TIMEOUT_DCCP_TIMEWAIT] = { .type = NLA_U32 },
731};
a874752a 732#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
50978462 733
2a389de8 734void nf_conntrack_dccp_init_net(struct net *net)
84c39451 735{
a95a7774 736 struct nf_dccp_net *dn = nf_dccp_pernet(net);
84c39451 737
2a389de8
FW		 738 /* default values */
739 dn->dccp_loose = 1;
740 dn->dccp_timeout[CT_DCCP_REQUEST] = 2 * DCCP_MSL;
741 dn->dccp_timeout[CT_DCCP_RESPOND] = 4 * DCCP_MSL;
742 dn->dccp_timeout[CT_DCCP_PARTOPEN] = 4 * DCCP_MSL;
743 dn->dccp_timeout[CT_DCCP_OPEN] = 12 * 3600 * HZ;
744 dn->dccp_timeout[CT_DCCP_CLOSEREQ] = 64 * HZ;
745 dn->dccp_timeout[CT_DCCP_CLOSING] = 64 * HZ;
746 dn->dccp_timeout[CT_DCCP_TIMEWAIT] = 2 * DCCP_MSL;
747
748 /* timeouts[0] is unused, make it same as SYN_SENT so
749 * ->timeouts[0] contains 'new' timeout, like udp or icmp.
750 */
751 dn->dccp_timeout[CT_DCCP_NONE] = dn->dccp_timeout[CT_DCCP_REQUEST];
deaa0a97
LZ		 752}
753
dd2934a9 754const struct nf_conntrack_l4proto nf_conntrack_l4proto_dccp = {
2bc78049 755 .l4proto = IPPROTO_DCCP,
c6dd940b 756 .can_early_drop = dccp_can_early_drop,
ea48cc83 757#ifdef CONFIG_NF_CONNTRACK_PROCFS
2bc78049 758 .print_conntrack = dccp_print_conntrack,
ea48cc83 759#endif
c0cd1156 760#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
39215846 761 .nlattr_size = DCCP_NLATTR_SIZE,
2bc78049
PM		 762 .to_nlattr = dccp_to_nlattr,
763 .from_nlattr = nlattr_to_dccp,
764 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
a400c30e 765 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
2bc78049
PM		 766 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
767 .nla_policy = nf_ct_port_nla_policy,
768#endif
a874752a 769#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
50978462
PNA		 770 .ctnl_timeout = {
771 .nlattr_to_obj = dccp_timeout_nlattr_to_obj,
772 .obj_to_nlattr = dccp_timeout_obj_to_nlattr,
773 .nlattr_max = CTA_TIMEOUT_DCCP_MAX,
774 .obj_size = sizeof(unsigned int) * CT_DCCP_MAX,
775 .nla_policy = dccp_timeout_nla_policy,
776 },
a874752a 777#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
2bc78049 778};
Linux 6.x block layer and io_uring tree(s)