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Merge tag 'v3.10.101' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / netfilter / nf_conntrack_proto_dccp.c
CommitLineData
2bc78049
PM		 1/*
2 * DCCP connection tracking protocol helper
3 *
4 * Copyright (c) 2005, 2006, 2008 Patrick McHardy <kaber@trash.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/sysctl.h>
15#include <linux/spinlock.h>
16#include <linux/skbuff.h>
17#include <linux/dccp.h>
5a0e3ad6 18#include <linux/slab.h>
2bc78049 19
1546000f
CG		 20#include <net/net_namespace.h>
21#include <net/netns/generic.h>
22
2bc78049
PM		 23#include <linux/netfilter/nfnetlink_conntrack.h>
24#include <net/netfilter/nf_conntrack.h>
25#include <net/netfilter/nf_conntrack_l4proto.h>
b38b1f61 26#include <net/netfilter/nf_conntrack_ecache.h>
2bc78049
PM		 27#include <net/netfilter/nf_log.h>
28
2bc78049
PM		 29/* Timeouts are based on values from RFC4340:
30 *
31 * - REQUEST:
32 *
33 * 8.1.2. Client Request
34 *
35 * A client MAY give up on its DCCP-Requests after some time
36 * (3 minutes, for example).
37 *
38 * - RESPOND:
39 *
40 * 8.1.3. Server Response
41 *
42 * It MAY also leave the RESPOND state for CLOSED after a timeout of
43 * not less than 4MSL (8 minutes);
44 *
45 * - PARTOPEN:
46 *
47 * 8.1.5. Handshake Completion
48 *
49 * If the client remains in PARTOPEN for more than 4MSL (8 minutes),
50 * it SHOULD reset the connection with Reset Code 2, "Aborted".
51 *
52 * - OPEN:
53 *
54 * The DCCP timestamp overflows after 11.9 hours. If the connection
55 * stays idle this long the sequence number won't be recognized
56 * as valid anymore.
57 *
58 * - CLOSEREQ/CLOSING:
59 *
60 * 8.3. Termination
61 *
62 * The retransmission timer should initially be set to go off in two
63 * round-trip times and should back off to not less than once every
64 * 64 seconds ...
65 *
66 * - TIMEWAIT:
67 *
68 * 4.3. States
69 *
70 * A server or client socket remains in this state for 2MSL (4 minutes)
71 * after the connection has been town down, ...
72 */
73
74#define DCCP_MSL (2 * 60 * HZ)
75
2bc78049
PM		 76static const char * const dccp_state_names[] = {
77 [CT_DCCP_NONE] = "NONE",
78 [CT_DCCP_REQUEST] = "REQUEST",
79 [CT_DCCP_RESPOND] = "RESPOND",
80 [CT_DCCP_PARTOPEN] = "PARTOPEN",
81 [CT_DCCP_OPEN] = "OPEN",
82 [CT_DCCP_CLOSEREQ] = "CLOSEREQ",
83 [CT_DCCP_CLOSING] = "CLOSING",
84 [CT_DCCP_TIMEWAIT] = "TIMEWAIT",
85 [CT_DCCP_IGNORE] = "IGNORE",
86 [CT_DCCP_INVALID] = "INVALID",
87};
88
89#define sNO CT_DCCP_NONE
90#define sRQ CT_DCCP_REQUEST
91#define sRS CT_DCCP_RESPOND
92#define sPO CT_DCCP_PARTOPEN
93#define sOP CT_DCCP_OPEN
94#define sCR CT_DCCP_CLOSEREQ
95#define sCG CT_DCCP_CLOSING
96#define sTW CT_DCCP_TIMEWAIT
97#define sIG CT_DCCP_IGNORE
98#define sIV CT_DCCP_INVALID
99
100/*
25985edc 101 * DCCP state transition table
2bc78049
PM		 102 *
103 * The assumption is the same as for TCP tracking:
104 *
105 * We are the man in the middle. All the packets go through us but might
106 * get lost in transit to the destination. It is assumed that the destination
107 * can't receive segments we haven't seen.
108 *
109 * The following states exist:
110 *
111 * NONE: Initial state, expecting Request
112 * REQUEST: Request seen, waiting for Response from server
113 * RESPOND: Response from server seen, waiting for Ack from client
114 * PARTOPEN: Ack after Response seen, waiting for packet other than Response,
115 * Reset or Sync from server
116 * OPEN: Packet other than Response, Reset or Sync seen
117 * CLOSEREQ: CloseReq from server seen, expecting Close from client
118 * CLOSING: Close seen, expecting Reset
119 * TIMEWAIT: Reset seen
120 * IGNORE: Not determinable whether packet is valid
121 *
122 * Some states exist only on one side of the connection: REQUEST, RESPOND,
123 * PARTOPEN, CLOSEREQ. For the other side these states are equivalent to
124 * the one it was in before.
125 *
126 * Packets are marked as ignored (sIG) if we don't know if they're valid
127 * (for example a reincarnation of a connection we didn't notice is dead
128 * already) and the server may send back a connection closing Reset or a
129 * Response. They're also used for Sync/SyncAck packets, which we don't
130 * care about.
131 */
132static const u_int8_t
133dccp_state_table[CT_DCCP_ROLE_MAX + 1][DCCP_PKT_SYNCACK + 1][CT_DCCP_MAX + 1] = {
134 [CT_DCCP_ROLE_CLIENT] = {
135 [DCCP_PKT_REQUEST] = {
136 /*
137 * sNO -> sRQ Regular Request
138 * sRQ -> sRQ Retransmitted Request or reincarnation
139 * sRS -> sRS Retransmitted Request (apparently Response
140 * got lost after we saw it) or reincarnation
141 * sPO -> sIG Ignore, conntrack might be out of sync
142 * sOP -> sIG Ignore, conntrack might be out of sync
143 * sCR -> sIG Ignore, conntrack might be out of sync
144 * sCG -> sIG Ignore, conntrack might be out of sync
145 * sTW -> sRQ Reincarnation
146 *
147 * sNO, sRQ, sRS, sPO. sOP, sCR, sCG, sTW, */
148 sRQ, sRQ, sRS, sIG, sIG, sIG, sIG, sRQ,
149 },
150 [DCCP_PKT_RESPONSE] = {
151 /*
152 * sNO -> sIV Invalid
153 * sRQ -> sIG Ignore, might be response to ignored Request
154 * sRS -> sIG Ignore, might be response to ignored Request
155 * sPO -> sIG Ignore, might be response to ignored Request
156 * sOP -> sIG Ignore, might be response to ignored Request
157 * sCR -> sIG Ignore, might be response to ignored Request
158 * sCG -> sIG Ignore, might be response to ignored Request
159 * sTW -> sIV Invalid, reincarnation in reverse direction
160 * goes through sRQ
161 *
162 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
163 sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIV,
164 },
165 [DCCP_PKT_ACK] = {
166 /*
167 * sNO -> sIV No connection
168 * sRQ -> sIV No connection
169 * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.)
170 * sPO -> sPO Retransmitted Ack for Response, remain in PARTOPEN
171 * sOP -> sOP Regular ACK, remain in OPEN
172 * sCR -> sCR Ack in CLOSEREQ MAY be processed (8.3.)
173 * sCG -> sCG Ack in CLOSING MAY be processed (8.3.)
174 * sTW -> sIV
175 *
176 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
177 sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV
178 },
179 [DCCP_PKT_DATA] = {
180 /*
181 * sNO -> sIV No connection
182 * sRQ -> sIV No connection
183 * sRS -> sIV No connection
184 * sPO -> sIV MUST use DataAck in PARTOPEN state (8.1.5.)
185 * sOP -> sOP Regular Data packet
186 * sCR -> sCR Data in CLOSEREQ MAY be processed (8.3.)
187 * sCG -> sCG Data in CLOSING MAY be processed (8.3.)
188 * sTW -> sIV
189 *
190 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
191 sIV, sIV, sIV, sIV, sOP, sCR, sCG, sIV,
192 },
193 [DCCP_PKT_DATAACK] = {
194 /*
195 * sNO -> sIV No connection
196 * sRQ -> sIV No connection
197 * sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.)
198 * sPO -> sPO Remain in PARTOPEN state
199 * sOP -> sOP Regular DataAck packet in OPEN state
200 * sCR -> sCR DataAck in CLOSEREQ MAY be processed (8.3.)
201 * sCG -> sCG DataAck in CLOSING MAY be processed (8.3.)
202 * sTW -> sIV
203 *
204 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
205 sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV
206 },
207 [DCCP_PKT_CLOSEREQ] = {
208 /*
209 * CLOSEREQ may only be sent by the server.
210 *
211 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
212 sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV
213 },
214 [DCCP_PKT_CLOSE] = {
215 /*
216 * sNO -> sIV No connection
217 * sRQ -> sIV No connection
218 * sRS -> sIV No connection
219 * sPO -> sCG Client-initiated close
220 * sOP -> sCG Client-initiated close
221 * sCR -> sCG Close in response to CloseReq (8.3.)
222 * sCG -> sCG Retransmit
223 * sTW -> sIV Late retransmit, already in TIME_WAIT
224 *
225 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
226 sIV, sIV, sIV, sCG, sCG, sCG, sIV, sIV
227 },
228 [DCCP_PKT_RESET] = {
229 /*
230 * sNO -> sIV No connection
231 * sRQ -> sTW Sync received or timeout, SHOULD send Reset (8.1.1.)
232 * sRS -> sTW Response received without Request
233 * sPO -> sTW Timeout, SHOULD send Reset (8.1.5.)
234 * sOP -> sTW Connection reset
235 * sCR -> sTW Connection reset
236 * sCG -> sTW Connection reset
237 * sTW -> sIG Ignore (don't refresh timer)
238 *
239 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
240 sIV, sTW, sTW, sTW, sTW, sTW, sTW, sIG
241 },
242 [DCCP_PKT_SYNC] = {
243 /*
244 * We currently ignore Sync packets
245 *
246 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
247 sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
248 },
249 [DCCP_PKT_SYNCACK] = {
250 /*
251 * We currently ignore SyncAck packets
252 *
253 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
254 sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
255 },
256 },
257 [CT_DCCP_ROLE_SERVER] = {
258 [DCCP_PKT_REQUEST] = {
259 /*
260 * sNO -> sIV Invalid
261 * sRQ -> sIG Ignore, conntrack might be out of sync
262 * sRS -> sIG Ignore, conntrack might be out of sync
263 * sPO -> sIG Ignore, conntrack might be out of sync
264 * sOP -> sIG Ignore, conntrack might be out of sync
265 * sCR -> sIG Ignore, conntrack might be out of sync
266 * sCG -> sIG Ignore, conntrack might be out of sync
267 * sTW -> sRQ Reincarnation, must reverse roles
268 *
269 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
270 sIV, sIG, sIG, sIG, sIG, sIG, sIG, sRQ
271 },
272 [DCCP_PKT_RESPONSE] = {
273 /*
274 * sNO -> sIV Response without Request
275 * sRQ -> sRS Response to clients Request
276 * sRS -> sRS Retransmitted Response (8.1.3. SHOULD NOT)
277 * sPO -> sIG Response to an ignored Request or late retransmit
278 * sOP -> sIG Ignore, might be response to ignored Request
279 * sCR -> sIG Ignore, might be response to ignored Request
280 * sCG -> sIG Ignore, might be response to ignored Request
281 * sTW -> sIV Invalid, Request from client in sTW moves to sRQ
282 *
283 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
284 sIV, sRS, sRS, sIG, sIG, sIG, sIG, sIV
285 },
286 [DCCP_PKT_ACK] = {
287 /*
288 * sNO -> sIV No connection
289 * sRQ -> sIV No connection
290 * sRS -> sIV No connection
291 * sPO -> sOP Enter OPEN state (8.1.5.)
292 * sOP -> sOP Regular Ack in OPEN state
293 * sCR -> sIV Waiting for Close from client
294 * sCG -> sCG Ack in CLOSING MAY be processed (8.3.)
295 * sTW -> sIV
296 *
297 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
298 sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV
299 },
300 [DCCP_PKT_DATA] = {
301 /*
302 * sNO -> sIV No connection
303 * sRQ -> sIV No connection
304 * sRS -> sIV No connection
305 * sPO -> sOP Enter OPEN state (8.1.5.)
306 * sOP -> sOP Regular Data packet in OPEN state
307 * sCR -> sIV Waiting for Close from client
308 * sCG -> sCG Data in CLOSING MAY be processed (8.3.)
309 * sTW -> sIV
310 *
311 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
312 sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV
313 },
314 [DCCP_PKT_DATAACK] = {
315 /*
316 * sNO -> sIV No connection
317 * sRQ -> sIV No connection
318 * sRS -> sIV No connection
319 * sPO -> sOP Enter OPEN state (8.1.5.)
320 * sOP -> sOP Regular DataAck in OPEN state
321 * sCR -> sIV Waiting for Close from client
322 * sCG -> sCG Data in CLOSING MAY be processed (8.3.)
323 * sTW -> sIV
324 *
325 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
326 sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV
327 },
328 [DCCP_PKT_CLOSEREQ] = {
329 /*
330 * sNO -> sIV No connection
331 * sRQ -> sIV No connection
332 * sRS -> sIV No connection
333 * sPO -> sOP -> sCR Move directly to CLOSEREQ (8.1.5.)
334 * sOP -> sCR CloseReq in OPEN state
335 * sCR -> sCR Retransmit
336 * sCG -> sCR Simultaneous close, client sends another Close
337 * sTW -> sIV Already closed
338 *
339 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
340 sIV, sIV, sIV, sCR, sCR, sCR, sCR, sIV
341 },
342 [DCCP_PKT_CLOSE] = {
343 /*
344 * sNO -> sIV No connection
345 * sRQ -> sIV No connection
346 * sRS -> sIV No connection
347 * sPO -> sOP -> sCG Move direcly to CLOSING
348 * sOP -> sCG Move to CLOSING
349 * sCR -> sIV Close after CloseReq is invalid
350 * sCG -> sCG Retransmit
351 * sTW -> sIV Already closed
352 *
353 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
354 sIV, sIV, sIV, sCG, sCG, sIV, sCG, sIV
355 },
356 [DCCP_PKT_RESET] = {
357 /*
358 * sNO -> sIV No connection
359 * sRQ -> sTW Reset in response to Request
360 * sRS -> sTW Timeout, SHOULD send Reset (8.1.3.)
361 * sPO -> sTW Timeout, SHOULD send Reset (8.1.3.)
362 * sOP -> sTW
363 * sCR -> sTW
364 * sCG -> sTW
365 * sTW -> sIG Ignore (don't refresh timer)
366 *
367 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW, sTW */
368 sIV, sTW, sTW, sTW, sTW, sTW, sTW, sTW, sIG
369 },
370 [DCCP_PKT_SYNC] = {
371 /*
372 * We currently ignore Sync packets
373 *
374 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
375 sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
376 },
377 [DCCP_PKT_SYNCACK] = {
378 /*
379 * We currently ignore SyncAck packets
380 *
381 * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
382 sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
383 },
384 },
385};
386
1546000f 387/* this module per-net specifics */
f99189b1 388static int dccp_net_id __read_mostly;
1546000f 389struct dccp_net {
54b8873f 390 struct nf_proto_net pn;
1546000f
CG		 391 int dccp_loose;
392 unsigned int dccp_timeout[CT_DCCP_MAX + 1];
1546000f
CG		 393};
394
395static inline struct dccp_net *dccp_pernet(struct net *net)
396{
397 return net_generic(net, dccp_net_id);
398}
399
09f263cd
JE		 400static bool dccp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
401 struct nf_conntrack_tuple *tuple)
2bc78049
PM		 402{
403 struct dccp_hdr _hdr, *dh;
404
405 dh = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
406 if (dh == NULL)
09f263cd 407 return false;
2bc78049
PM		 408
409 tuple->src.u.dccp.port = dh->dccph_sport;
410 tuple->dst.u.dccp.port = dh->dccph_dport;
09f263cd 411 return true;
2bc78049
PM		 412}
413
09f263cd
JE		 414static bool dccp_invert_tuple(struct nf_conntrack_tuple *inv,
415 const struct nf_conntrack_tuple *tuple)
2bc78049
PM		 416{
417 inv->src.u.dccp.port = tuple->dst.u.dccp.port;
418 inv->dst.u.dccp.port = tuple->src.u.dccp.port;
09f263cd 419 return true;
2bc78049
PM		 420}
421
09f263cd 422static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb,
2c8503f5 423 unsigned int dataoff, unsigned int *timeouts)
2bc78049 424{
c2a2c7e0 425 struct net *net = nf_ct_net(ct);
1546000f 426 struct dccp_net *dn;
2bc78049
PM		 427 struct dccp_hdr _dh, *dh;
428 const char *msg;
429 u_int8_t state;
430
b086eb68 431 dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
2bc78049
PM		 432 BUG_ON(dh == NULL);
433
434 state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE];
435 switch (state) {
436 default:
1546000f
CG		 437 dn = dccp_pernet(net);
438 if (dn->dccp_loose == 0) {
2bc78049
PM		 439 msg = "nf_ct_dccp: not picking up existing connection ";
440 goto out_invalid;
441 }
442 case CT_DCCP_REQUEST:
443 break;
444 case CT_DCCP_INVALID:
445 msg = "nf_ct_dccp: invalid state transition ";
446 goto out_invalid;
447 }
448
449 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT;
450 ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER;
451 ct->proto.dccp.state = CT_DCCP_NONE;
e5fc9e7a
CG		 452 ct->proto.dccp.last_pkt = DCCP_PKT_REQUEST;
453 ct->proto.dccp.last_dir = IP_CT_DIR_ORIGINAL;
454 ct->proto.dccp.handshake_seq = 0;
09f263cd 455 return true;
2bc78049
PM		 456
457out_invalid:
c2a2c7e0 458 if (LOG_INVALID(net, IPPROTO_DCCP))
30e0c6a6
G		 459 nf_log_packet(net, nf_ct_l3num(ct), 0, skb, NULL, NULL,
460 NULL, msg);
09f263cd 461 return false;
2bc78049
PM		 462}
463
464static u64 dccp_ack_seq(const struct dccp_hdr *dh)
465{
466 const struct dccp_hdr_ack_bits *dhack;
467
468 dhack = (void *)dh + __dccp_basic_hdr_len(dh);
469 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) +
470 ntohl(dhack->dccph_ack_nr_low);
471}
472
2c8503f5
PNA		 473static unsigned int *dccp_get_timeouts(struct net *net)
474{
475 return dccp_pernet(net)->dccp_timeout;
476}
477
2bc78049
PM		 478static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb,
479 unsigned int dataoff, enum ip_conntrack_info ctinfo,
2c8503f5
PNA		 480 u_int8_t pf, unsigned int hooknum,
481 unsigned int *timeouts)
2bc78049 482{
c2a2c7e0 483 struct net *net = nf_ct_net(ct);
2bc78049
PM		 484 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
485 struct dccp_hdr _dh, *dh;
486 u_int8_t type, old_state, new_state;
487 enum ct_dccp_roles role;
488
b086eb68 489 dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
2bc78049
PM		 490 BUG_ON(dh == NULL);
491 type = dh->dccph_type;
492
493 if (type == DCCP_PKT_RESET &&
494 !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
495 /* Tear down connection immediately if only reply is a RESET */
718d4ad9 496 nf_ct_kill_acct(ct, ctinfo, skb);
2bc78049
PM		 497 return NF_ACCEPT;
498 }
499
440f0d58 500 spin_lock_bh(&ct->lock);
2bc78049
PM		 501
502 role = ct->proto.dccp.role[dir];
503 old_state = ct->proto.dccp.state;
504 new_state = dccp_state_table[role][type][old_state];
505
506 switch (new_state) {
507 case CT_DCCP_REQUEST:
508 if (old_state == CT_DCCP_TIMEWAIT &&
509 role == CT_DCCP_ROLE_SERVER) {
510 /* Reincarnation in the reverse direction: reopen and
511 * reverse client/server roles. */
512 ct->proto.dccp.role[dir] = CT_DCCP_ROLE_CLIENT;
513 ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_SERVER;
514 }
515 break;
516 case CT_DCCP_RESPOND:
517 if (old_state == CT_DCCP_REQUEST)
518 ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh);
519 break;
520 case CT_DCCP_PARTOPEN:
521 if (old_state == CT_DCCP_RESPOND &&
522 type == DCCP_PKT_ACK &&
523 dccp_ack_seq(dh) == ct->proto.dccp.handshake_seq)
524 set_bit(IPS_ASSURED_BIT, &ct->status);
525 break;
526 case CT_DCCP_IGNORE:
527 /*
528 * Connection tracking might be out of sync, so we ignore
529 * packets that might establish a new connection and resync
530 * if the server responds with a valid Response.
531 */
532 if (ct->proto.dccp.last_dir == !dir &&
533 ct->proto.dccp.last_pkt == DCCP_PKT_REQUEST &&
534 type == DCCP_PKT_RESPONSE) {
535 ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_CLIENT;
536 ct->proto.dccp.role[dir] = CT_DCCP_ROLE_SERVER;
537 ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh);
538 new_state = CT_DCCP_RESPOND;
539 break;
540 }
541 ct->proto.dccp.last_dir = dir;
542 ct->proto.dccp.last_pkt = type;
543
440f0d58 544 spin_unlock_bh(&ct->lock);
c2a2c7e0 545 if (LOG_INVALID(net, IPPROTO_DCCP))
30e0c6a6 546 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
2bc78049
PM		 547 "nf_ct_dccp: invalid packet ignored ");
548 return NF_ACCEPT;
549 case CT_DCCP_INVALID:
440f0d58 550 spin_unlock_bh(&ct->lock);
c2a2c7e0 551 if (LOG_INVALID(net, IPPROTO_DCCP))
30e0c6a6 552 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
2bc78049
PM		 553 "nf_ct_dccp: invalid state transition ");
554 return -NF_ACCEPT;
555 }
556
557 ct->proto.dccp.last_dir = dir;
558 ct->proto.dccp.last_pkt = type;
559 ct->proto.dccp.state = new_state;
440f0d58 560 spin_unlock_bh(&ct->lock);
1546000f 561
b38b1f61
PNA		 562 if (new_state != old_state)
563 nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
564
2c8503f5 565 nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]);
2bc78049
PM		 566
567 return NF_ACCEPT;
568}
569
8fea97ec
PM		 570static int dccp_error(struct net *net, struct nf_conn *tmpl,
571 struct sk_buff *skb, unsigned int dataoff,
572 enum ip_conntrack_info *ctinfo,
74c51a14 573 u_int8_t pf, unsigned int hooknum)
2bc78049
PM		 574{
575 struct dccp_hdr _dh, *dh;
576 unsigned int dccp_len = skb->len - dataoff;
577 unsigned int cscov;
578 const char *msg;
579
b086eb68 580 dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
2bc78049
PM		 581 if (dh == NULL) {
582 msg = "nf_ct_dccp: short packet ";
583 goto out_invalid;
584 }
585
586 if (dh->dccph_doff * 4 < sizeof(struct dccp_hdr) ||
587 dh->dccph_doff * 4 > dccp_len) {
588 msg = "nf_ct_dccp: truncated/malformed packet ";
589 goto out_invalid;
590 }
591
592 cscov = dccp_len;
593 if (dh->dccph_cscov) {
594 cscov = (dh->dccph_cscov - 1) * 4;
595 if (cscov > dccp_len) {
596 msg = "nf_ct_dccp: bad checksum coverage ";
597 goto out_invalid;
598 }
599 }
600
c04d0552 601 if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
2bc78049
PM		 602 nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_DCCP,
603 pf)) {
604 msg = "nf_ct_dccp: bad checksum ";
605 goto out_invalid;
606 }
607
608 if (dh->dccph_type >= DCCP_PKT_INVALID) {
609 msg = "nf_ct_dccp: reserved packet type ";
610 goto out_invalid;
611 }
612
613 return NF_ACCEPT;
614
615out_invalid:
c2a2c7e0 616 if (LOG_INVALID(net, IPPROTO_DCCP))
30e0c6a6 617 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, msg);
2bc78049
PM		 618 return -NF_ACCEPT;
619}
620
621static int dccp_print_tuple(struct seq_file *s,
622 const struct nf_conntrack_tuple *tuple)
623{
624 return seq_printf(s, "sport=%hu dport=%hu ",
625 ntohs(tuple->src.u.dccp.port),
626 ntohs(tuple->dst.u.dccp.port));
627}
628
440f0d58 629static int dccp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
2bc78049
PM		 630{
631 return seq_printf(s, "%s ", dccp_state_names[ct->proto.dccp.state]);
632}
633
c0cd1156 634#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
2bc78049 635static int dccp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
440f0d58 636 struct nf_conn *ct)
2bc78049
PM		 637{
638 struct nlattr *nest_parms;
639
440f0d58 640 spin_lock_bh(&ct->lock);
2bc78049
PM		 641 nest_parms = nla_nest_start(skb, CTA_PROTOINFO_DCCP | NLA_F_NESTED);
642 if (!nest_parms)
643 goto nla_put_failure;
516ee48f
DM		 644 if (nla_put_u8(skb, CTA_PROTOINFO_DCCP_STATE, ct->proto.dccp.state) ||
645 nla_put_u8(skb, CTA_PROTOINFO_DCCP_ROLE,
646 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL]) ||
647 nla_put_be64(skb, CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ,
648 cpu_to_be64(ct->proto.dccp.handshake_seq)))
649 goto nla_put_failure;
2bc78049 650 nla_nest_end(skb, nest_parms);
440f0d58 651 spin_unlock_bh(&ct->lock);
2bc78049
PM		 652 return 0;
653
654nla_put_failure:
440f0d58 655 spin_unlock_bh(&ct->lock);
2bc78049
PM		 656 return -1;
657}
658
659static const struct nla_policy dccp_nla_policy[CTA_PROTOINFO_DCCP_MAX + 1] = {
660 [CTA_PROTOINFO_DCCP_STATE] = { .type = NLA_U8 },
71951b64 661 [CTA_PROTOINFO_DCCP_ROLE] = { .type = NLA_U8 },
a17c8598 662 [CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ] = { .type = NLA_U64 },
2bc78049
PM		 663};
664
665static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct)
666{
667 struct nlattr *attr = cda[CTA_PROTOINFO_DCCP];
668 struct nlattr *tb[CTA_PROTOINFO_DCCP_MAX + 1];
669 int err;
670
671 if (!attr)
672 return 0;
673
674 err = nla_parse_nested(tb, CTA_PROTOINFO_DCCP_MAX, attr,
675 dccp_nla_policy);
676 if (err < 0)
677 return err;
678
679 if (!tb[CTA_PROTOINFO_DCCP_STATE] ||
71951b64
PNA		 680 !tb[CTA_PROTOINFO_DCCP_ROLE] ||
681 nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) > CT_DCCP_ROLE_MAX ||
682 nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]) >= CT_DCCP_IGNORE) {
2bc78049 683 return -EINVAL;
71951b64 684 }
2bc78049 685
440f0d58 686 spin_lock_bh(&ct->lock);
2bc78049 687 ct->proto.dccp.state = nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]);
71951b64
PNA		 688 if (nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) == CT_DCCP_ROLE_CLIENT) {
689 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT;
690 ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER;
691 } else {
692 ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_SERVER;
693 ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_CLIENT;
694 }
a17c8598
PNA		 695 if (tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]) {
696 ct->proto.dccp.handshake_seq =
697 be64_to_cpu(nla_get_be64(tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]));
698 }
440f0d58 699 spin_unlock_bh(&ct->lock);
2bc78049
PM		 700 return 0;
701}
a400c30e
HE		 702
703static int dccp_nlattr_size(void)
704{
705 return nla_total_size(0) /* CTA_PROTOINFO_DCCP */
706 + nla_policy_len(dccp_nla_policy, CTA_PROTOINFO_DCCP_MAX + 1);
707}
50978462 708
2bc78049
PM		 709#endif
710
50978462
PNA		 711#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
712
713#include <linux/netfilter/nfnetlink.h>
714#include <linux/netfilter/nfnetlink_cttimeout.h>
715
8264deb8
G		 716static int dccp_timeout_nlattr_to_obj(struct nlattr *tb[],
717 struct net *net, void *data)
50978462 718{
8264deb8 719 struct dccp_net *dn = dccp_pernet(net);
50978462
PNA		 720 unsigned int *timeouts = data;
721 int i;
722
723 /* set default DCCP timeouts. */
724 for (i=0; i<CT_DCCP_MAX; i++)
725 timeouts[i] = dn->dccp_timeout[i];
726
727 /* there's a 1:1 mapping between attributes and protocol states. */
728 for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) {
729 if (tb[i]) {
730 timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ;
731 }
732 }
733 return 0;
734}
735
736static int
737dccp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
738{
739 const unsigned int *timeouts = data;
740 int i;
741
516ee48f
DM		 742 for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) {
743 if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ)))
744 goto nla_put_failure;
745 }
50978462
PNA		 746 return 0;
747
748nla_put_failure:
749 return -ENOSPC;
750}
751
752static const struct nla_policy
753dccp_timeout_nla_policy[CTA_TIMEOUT_DCCP_MAX+1] = {
754 [CTA_TIMEOUT_DCCP_REQUEST] = { .type = NLA_U32 },
755 [CTA_TIMEOUT_DCCP_RESPOND] = { .type = NLA_U32 },
756 [CTA_TIMEOUT_DCCP_PARTOPEN] = { .type = NLA_U32 },
757 [CTA_TIMEOUT_DCCP_OPEN] = { .type = NLA_U32 },
758 [CTA_TIMEOUT_DCCP_CLOSEREQ] = { .type = NLA_U32 },
759 [CTA_TIMEOUT_DCCP_CLOSING] = { .type = NLA_U32 },
760 [CTA_TIMEOUT_DCCP_TIMEWAIT] = { .type = NLA_U32 },
761};
762#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
763
2bc78049 764#ifdef CONFIG_SYSCTL
1546000f
CG		 765/* template, data assigned later */
766static struct ctl_table dccp_sysctl_table[] = {
2bc78049 767 {
2bc78049 768 .procname = "nf_conntrack_dccp_timeout_request",
2bc78049
PM		 769 .maxlen = sizeof(unsigned int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec_jiffies,
772 },
773 {
2bc78049 774 .procname = "nf_conntrack_dccp_timeout_respond",
2bc78049
PM		 775 .maxlen = sizeof(unsigned int),
776 .mode = 0644,
777 .proc_handler = proc_dointvec_jiffies,
778 },
779 {
2bc78049 780 .procname = "nf_conntrack_dccp_timeout_partopen",
2bc78049
PM		 781 .maxlen = sizeof(unsigned int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec_jiffies,
784 },
785 {
2bc78049 786 .procname = "nf_conntrack_dccp_timeout_open",
2bc78049
PM		 787 .maxlen = sizeof(unsigned int),
788 .mode = 0644,
789 .proc_handler = proc_dointvec_jiffies,
790 },
791 {
2bc78049 792 .procname = "nf_conntrack_dccp_timeout_closereq",
2bc78049
PM		 793 .maxlen = sizeof(unsigned int),
794 .mode = 0644,
795 .proc_handler = proc_dointvec_jiffies,
796 },
797 {
2bc78049 798 .procname = "nf_conntrack_dccp_timeout_closing",
2bc78049
PM		 799 .maxlen = sizeof(unsigned int),
800 .mode = 0644,
801 .proc_handler = proc_dointvec_jiffies,
802 },
803 {
2bc78049 804 .procname = "nf_conntrack_dccp_timeout_timewait",
2bc78049
PM		 805 .maxlen = sizeof(unsigned int),
806 .mode = 0644,
807 .proc_handler = proc_dointvec_jiffies,
808 },
809 {
2bc78049 810 .procname = "nf_conntrack_dccp_loose",
1546000f 811 .maxlen = sizeof(int),
2bc78049
PM		 812 .mode = 0644,
813 .proc_handler = proc_dointvec,
814 },
f8572d8f 815 { }
2bc78049
PM		 816};
817#endif /* CONFIG_SYSCTL */
818
464dc801 819static int dccp_kmemdup_sysctl_table(struct net *net, struct nf_proto_net *pn,
54b8873f
G		 820 struct dccp_net *dn)
821{
822#ifdef CONFIG_SYSCTL
823 if (pn->ctl_table)
824 return 0;
825
826 pn->ctl_table = kmemdup(dccp_sysctl_table,
827 sizeof(dccp_sysctl_table),
828 GFP_KERNEL);
829 if (!pn->ctl_table)
830 return -ENOMEM;
831
832 pn->ctl_table[0].data = &dn->dccp_timeout[CT_DCCP_REQUEST];
833 pn->ctl_table[1].data = &dn->dccp_timeout[CT_DCCP_RESPOND];
834 pn->ctl_table[2].data = &dn->dccp_timeout[CT_DCCP_PARTOPEN];
835 pn->ctl_table[3].data = &dn->dccp_timeout[CT_DCCP_OPEN];
836 pn->ctl_table[4].data = &dn->dccp_timeout[CT_DCCP_CLOSEREQ];
837 pn->ctl_table[5].data = &dn->dccp_timeout[CT_DCCP_CLOSING];
838 pn->ctl_table[6].data = &dn->dccp_timeout[CT_DCCP_TIMEWAIT];
839 pn->ctl_table[7].data = &dn->dccp_loose;
464dc801
EB		 840
841 /* Don't export sysctls to unprivileged users */
842 if (net->user_ns != &init_user_ns)
843 pn->ctl_table[0].procname = NULL;
54b8873f
G		 844#endif
845 return 0;
846}
847
f1caad27 848static int dccp_init_net(struct net *net, u_int16_t proto)
84c39451
G		 849{
850 struct dccp_net *dn = dccp_pernet(net);
54b8873f 851 struct nf_proto_net *pn = &dn->pn;
84c39451 852
54b8873f 853 if (!pn->users) {
84c39451
G		 854 /* default values */
855 dn->dccp_loose = 1;
856 dn->dccp_timeout[CT_DCCP_REQUEST] = 2 * DCCP_MSL;
857 dn->dccp_timeout[CT_DCCP_RESPOND] = 4 * DCCP_MSL;
858 dn->dccp_timeout[CT_DCCP_PARTOPEN] = 4 * DCCP_MSL;
859 dn->dccp_timeout[CT_DCCP_OPEN] = 12 * 3600 * HZ;
860 dn->dccp_timeout[CT_DCCP_CLOSEREQ] = 64 * HZ;
861 dn->dccp_timeout[CT_DCCP_CLOSING] = 64 * HZ;
862 dn->dccp_timeout[CT_DCCP_TIMEWAIT] = 2 * DCCP_MSL;
84c39451 863 }
54b8873f 864
464dc801 865 return dccp_kmemdup_sysctl_table(net, pn, dn);
84c39451
G		 866}
867
2bc78049
PM		 868static struct nf_conntrack_l4proto dccp_proto4 __read_mostly = {
869 .l3proto = AF_INET,
870 .l4proto = IPPROTO_DCCP,
871 .name = "dccp",
872 .pkt_to_tuple = dccp_pkt_to_tuple,
873 .invert_tuple = dccp_invert_tuple,
874 .new = dccp_new,
875 .packet = dccp_packet,
2c8503f5 876 .get_timeouts = dccp_get_timeouts,
2bc78049
PM		 877 .error = dccp_error,
878 .print_tuple = dccp_print_tuple,
879 .print_conntrack = dccp_print_conntrack,
c0cd1156 880#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
2bc78049 881 .to_nlattr = dccp_to_nlattr,
a400c30e 882 .nlattr_size = dccp_nlattr_size,
2bc78049
PM		 883 .from_nlattr = nlattr_to_dccp,
884 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
a400c30e 885 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
2bc78049
PM		 886 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
887 .nla_policy = nf_ct_port_nla_policy,
888#endif
50978462
PNA		 889#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
890 .ctnl_timeout = {
891 .nlattr_to_obj = dccp_timeout_nlattr_to_obj,
892 .obj_to_nlattr = dccp_timeout_obj_to_nlattr,
893 .nlattr_max = CTA_TIMEOUT_DCCP_MAX,
894 .obj_size = sizeof(unsigned int) * CT_DCCP_MAX,
895 .nla_policy = dccp_timeout_nla_policy,
896 },
897#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
84c39451
G		 898 .net_id = &dccp_net_id,
899 .init_net = dccp_init_net,
2bc78049
PM		 900};
901
902static struct nf_conntrack_l4proto dccp_proto6 __read_mostly = {
903 .l3proto = AF_INET6,
904 .l4proto = IPPROTO_DCCP,
905 .name = "dccp",
906 .pkt_to_tuple = dccp_pkt_to_tuple,
907 .invert_tuple = dccp_invert_tuple,
908 .new = dccp_new,
909 .packet = dccp_packet,
2c8503f5 910 .get_timeouts = dccp_get_timeouts,
2bc78049
PM		 911 .error = dccp_error,
912 .print_tuple = dccp_print_tuple,
913 .print_conntrack = dccp_print_conntrack,
c0cd1156 914#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
2bc78049 915 .to_nlattr = dccp_to_nlattr,
5ff48294 916 .nlattr_size = dccp_nlattr_size,
2bc78049
PM		 917 .from_nlattr = nlattr_to_dccp,
918 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
a400c30e 919 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
2bc78049
PM		 920 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
921 .nla_policy = nf_ct_port_nla_policy,
922#endif
50978462
PNA		 923#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
924 .ctnl_timeout = {
925 .nlattr_to_obj = dccp_timeout_nlattr_to_obj,
926 .obj_to_nlattr = dccp_timeout_obj_to_nlattr,
927 .nlattr_max = CTA_TIMEOUT_DCCP_MAX,
928 .obj_size = sizeof(unsigned int) * CT_DCCP_MAX,
929 .nla_policy = dccp_timeout_nla_policy,
930 },
931#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
84c39451
G		 932 .net_id = &dccp_net_id,
933 .init_net = dccp_init_net,
1546000f
CG		 934};
935
936static __net_init int dccp_net_init(struct net *net)
937{
84c39451 938 int ret = 0;
c296bb4d 939 ret = nf_ct_l4proto_pernet_register(net, &dccp_proto4);
84c39451 940 if (ret < 0) {
c296bb4d 941 pr_err("nf_conntrack_dccp4: pernet registration failed.\n");
84c39451
G		 942 goto out;
943 }
c296bb4d 944 ret = nf_ct_l4proto_pernet_register(net, &dccp_proto6);
84c39451 945 if (ret < 0) {
c296bb4d 946 pr_err("nf_conntrack_dccp6: pernet registration failed.\n");
84c39451 947 goto cleanup_dccp4;
1546000f 948 }
1546000f 949 return 0;
84c39451 950cleanup_dccp4:
c296bb4d 951 nf_ct_l4proto_pernet_unregister(net, &dccp_proto4);
84c39451
G		 952out:
953 return ret;
1546000f
CG		 954}
955
956static __net_exit void dccp_net_exit(struct net *net)
957{
c296bb4d
G		 958 nf_ct_l4proto_pernet_unregister(net, &dccp_proto6);
959 nf_ct_l4proto_pernet_unregister(net, &dccp_proto4);
1546000f
CG		 960}
961
962static struct pernet_operations dccp_net_ops = {
963 .init = dccp_net_init,
964 .exit = dccp_net_exit,
32b51f92
EB		 965 .id = &dccp_net_id,
966 .size = sizeof(struct dccp_net),
2bc78049
PM		 967};
968
969static int __init nf_conntrack_proto_dccp_init(void)
970{
c296bb4d
G		 971 int ret;
972
0d98da5d
G		 973 ret = register_pernet_subsys(&dccp_net_ops);
974 if (ret < 0)
975 goto out_pernet;
976
c296bb4d
G		 977 ret = nf_ct_l4proto_register(&dccp_proto4);
978 if (ret < 0)
979 goto out_dccp4;
980
981 ret = nf_ct_l4proto_register(&dccp_proto6);
982 if (ret < 0)
983 goto out_dccp6;
984
c296bb4d 985 return 0;
c296bb4d
G		 986out_dccp6:
987 nf_ct_l4proto_unregister(&dccp_proto4);
988out_dccp4:
0d98da5d
G		 989 unregister_pernet_subsys(&dccp_net_ops);
990out_pernet:
c296bb4d 991 return ret;
2bc78049
PM		 992}
993
994static void __exit nf_conntrack_proto_dccp_fini(void)
995{
c296bb4d
G		 996 nf_ct_l4proto_unregister(&dccp_proto6);
997 nf_ct_l4proto_unregister(&dccp_proto4);
32b51f92 998 unregister_pernet_subsys(&dccp_net_ops);
2bc78049
PM		 999}
1000
1001module_init(nf_conntrack_proto_dccp_init);
1002module_exit(nf_conntrack_proto_dccp_fini);
1003
1004MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1005MODULE_DESCRIPTION("DCCP connection tracking protocol helper");
1006MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)