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-rw-r--r--net/dccp/ipv4.c1356
1 files changed, 1356 insertions, 0 deletions
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
new file mode 100644
index 000000000000..3fc75dbee4b8
--- /dev/null
+++ b/net/dccp/ipv4.c
@@ -0,0 +1,1356 @@
1/*
2 * net/dccp/ipv4.c
3 *
4 * An implementation of the DCCP protocol
5 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#include <linux/config.h>
14#include <linux/dccp.h>
15#include <linux/icmp.h>
16#include <linux/module.h>
17#include <linux/skbuff.h>
18#include <linux/random.h>
19
20#include <net/icmp.h>
21#include <net/inet_hashtables.h>
22#include <net/sock.h>
23#include <net/tcp_states.h>
24#include <net/xfrm.h>
25
26#include "ccid.h"
27#include "dccp.h"
28
29struct inet_hashinfo __cacheline_aligned dccp_hashinfo = {
30 .lhash_lock = RW_LOCK_UNLOCKED,
31 .lhash_users = ATOMIC_INIT(0),
32 .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(dccp_hashinfo.lhash_wait),
33 .portalloc_lock = SPIN_LOCK_UNLOCKED,
34 .port_rover = 1024 - 1,
35};
36
37EXPORT_SYMBOL_GPL(dccp_hashinfo);
38
39static int dccp_v4_get_port(struct sock *sk, const unsigned short snum)
40{
41 return inet_csk_get_port(&dccp_hashinfo, sk, snum);
42}
43
44static void dccp_v4_hash(struct sock *sk)
45{
46 inet_hash(&dccp_hashinfo, sk);
47}
48
49static void dccp_v4_unhash(struct sock *sk)
50{
51 inet_unhash(&dccp_hashinfo, sk);
52}
53
54/* called with local bh disabled */
55static int __dccp_v4_check_established(struct sock *sk, const __u16 lport,
56 struct inet_timewait_sock **twp)
57{
58 struct inet_sock *inet = inet_sk(sk);
59 const u32 daddr = inet->rcv_saddr;
60 const u32 saddr = inet->daddr;
61 const int dif = sk->sk_bound_dev_if;
62 INET_ADDR_COOKIE(acookie, saddr, daddr)
63 const __u32 ports = INET_COMBINED_PORTS(inet->dport, lport);
64 const int hash = inet_ehashfn(daddr, lport, saddr, inet->dport,
65 dccp_hashinfo.ehash_size);
66 struct inet_ehash_bucket *head = &dccp_hashinfo.ehash[hash];
67 const struct sock *sk2;
68 const struct hlist_node *node;
69 struct inet_timewait_sock *tw;
70
71 write_lock(&head->lock);
72
73 /* Check TIME-WAIT sockets first. */
74 sk_for_each(sk2, node, &(head + dccp_hashinfo.ehash_size)->chain) {
75 tw = inet_twsk(sk2);
76
77 if (INET_TW_MATCH(sk2, acookie, saddr, daddr, ports, dif))
78 goto not_unique;
79 }
80 tw = NULL;
81
82 /* And established part... */
83 sk_for_each(sk2, node, &head->chain) {
84 if (INET_MATCH(sk2, acookie, saddr, daddr, ports, dif))
85 goto not_unique;
86 }
87
88 /* Must record num and sport now. Otherwise we will see
89 * in hash table socket with a funny identity. */
90 inet->num = lport;
91 inet->sport = htons(lport);
92 sk->sk_hashent = hash;
93 BUG_TRAP(sk_unhashed(sk));
94 __sk_add_node(sk, &head->chain);
95 sock_prot_inc_use(sk->sk_prot);
96 write_unlock(&head->lock);
97
98 if (twp != NULL) {
99 *twp = tw;
100 NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
101 } else if (tw != NULL) {
102 /* Silly. Should hash-dance instead... */
103 inet_twsk_deschedule(tw, &dccp_death_row);
104 NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
105
106 inet_twsk_put(tw);
107 }
108
109 return 0;
110
111not_unique:
112 write_unlock(&head->lock);
113 return -EADDRNOTAVAIL;
114}
115
116/*
117 * Bind a port for a connect operation and hash it.
118 */
119static int dccp_v4_hash_connect(struct sock *sk)
120{
121 const unsigned short snum = inet_sk(sk)->num;
122 struct inet_bind_hashbucket *head;
123 struct inet_bind_bucket *tb;
124 int ret;
125
126 if (snum == 0) {
127 int rover;
128 int low = sysctl_local_port_range[0];
129 int high = sysctl_local_port_range[1];
130 int remaining = (high - low) + 1;
131 struct hlist_node *node;
132 struct inet_timewait_sock *tw = NULL;
133
134 local_bh_disable();
135
136 /* TODO. Actually it is not so bad idea to remove
137 * dccp_hashinfo.portalloc_lock before next submission to
138 * Linus.
139 * As soon as we touch this place at all it is time to think.
140 *
141 * Now it protects single _advisory_ variable
142 * dccp_hashinfo.port_rover, hence it is mostly useless.
143 * Code will work nicely if we just delete it, but
144 * I am afraid in contented case it will work not better or
145 * even worse: another cpu just will hit the same bucket
146 * and spin there.
147 * So some cpu salt could remove both contention and
148 * memory pingpong. Any ideas how to do this in a nice way?
149 */
150 spin_lock(&dccp_hashinfo.portalloc_lock);
151 rover = dccp_hashinfo.port_rover;
152
153 do {
154 rover++;
155 if ((rover < low) || (rover > high))
156 rover = low;
157 head = &dccp_hashinfo.bhash[inet_bhashfn(rover,
158 dccp_hashinfo.bhash_size)];
159 spin_lock(&head->lock);
160
161 /* Does not bother with rcv_saddr checks,
162 * because the established check is already
163 * unique enough.
164 */
165 inet_bind_bucket_for_each(tb, node, &head->chain) {
166 if (tb->port == rover) {
167 BUG_TRAP(!hlist_empty(&tb->owners));
168 if (tb->fastreuse >= 0)
169 goto next_port;
170 if (!__dccp_v4_check_established(sk,
171 rover,
172 &tw))
173 goto ok;
174 goto next_port;
175 }
176 }
177
178 tb = inet_bind_bucket_create(dccp_hashinfo.bind_bucket_cachep,
179 head, rover);
180 if (tb == NULL) {
181 spin_unlock(&head->lock);
182 break;
183 }
184 tb->fastreuse = -1;
185 goto ok;
186
187 next_port:
188 spin_unlock(&head->lock);
189 } while (--remaining > 0);
190 dccp_hashinfo.port_rover = rover;
191 spin_unlock(&dccp_hashinfo.portalloc_lock);
192
193 local_bh_enable();
194
195 return -EADDRNOTAVAIL;
196
197ok:
198 /* All locks still held and bhs disabled */
199 dccp_hashinfo.port_rover = rover;
200 spin_unlock(&dccp_hashinfo.portalloc_lock);
201
202 inet_bind_hash(sk, tb, rover);
203 if (sk_unhashed(sk)) {
204 inet_sk(sk)->sport = htons(rover);
205 __inet_hash(&dccp_hashinfo, sk, 0);
206 }
207 spin_unlock(&head->lock);
208
209 if (tw != NULL) {
210 inet_twsk_deschedule(tw, &dccp_death_row);
211 inet_twsk_put(tw);
212 }
213
214 ret = 0;
215 goto out;
216 }
217
218 head = &dccp_hashinfo.bhash[inet_bhashfn(snum,
219 dccp_hashinfo.bhash_size)];
220 tb = inet_csk(sk)->icsk_bind_hash;
221 spin_lock_bh(&head->lock);
222 if (sk_head(&tb->owners) == sk && sk->sk_bind_node.next == NULL) {
223 __inet_hash(&dccp_hashinfo, sk, 0);
224 spin_unlock_bh(&head->lock);
225 return 0;
226 } else {
227 spin_unlock(&head->lock);
228 /* No definite answer... Walk to established hash table */
229 ret = __dccp_v4_check_established(sk, snum, NULL);
230out:
231 local_bh_enable();
232 return ret;
233 }
234}
235
236static int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
237 int addr_len)
238{
239 struct inet_sock *inet = inet_sk(sk);
240 struct dccp_sock *dp = dccp_sk(sk);
241 const struct sockaddr_in *usin = (struct sockaddr_in *)uaddr;
242 struct rtable *rt;
243 u32 daddr, nexthop;
244 int tmp;
245 int err;
246
247 dp->dccps_role = DCCP_ROLE_CLIENT;
248
249 if (addr_len < sizeof(struct sockaddr_in))
250 return -EINVAL;
251
252 if (usin->sin_family != AF_INET)
253 return -EAFNOSUPPORT;
254
255 nexthop = daddr = usin->sin_addr.s_addr;
256 if (inet->opt != NULL && inet->opt->srr) {
257 if (daddr == 0)
258 return -EINVAL;
259 nexthop = inet->opt->faddr;
260 }
261
262 tmp = ip_route_connect(&rt, nexthop, inet->saddr,
263 RT_CONN_FLAGS(sk), sk->sk_bound_dev_if,
264 IPPROTO_DCCP,
265 inet->sport, usin->sin_port, sk);
266 if (tmp < 0)
267 return tmp;
268
269 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
270 ip_rt_put(rt);
271 return -ENETUNREACH;
272 }
273
274 if (inet->opt == NULL || !inet->opt->srr)
275 daddr = rt->rt_dst;
276
277 if (inet->saddr == 0)
278 inet->saddr = rt->rt_src;
279 inet->rcv_saddr = inet->saddr;
280
281 inet->dport = usin->sin_port;
282 inet->daddr = daddr;
283
284 dp->dccps_ext_header_len = 0;
285 if (inet->opt != NULL)
286 dp->dccps_ext_header_len = inet->opt->optlen;
287 /*
288 * Socket identity is still unknown (sport may be zero).
289 * However we set state to DCCP_REQUESTING and not releasing socket
290 * lock select source port, enter ourselves into the hash tables and
291 * complete initialization after this.
292 */
293 dccp_set_state(sk, DCCP_REQUESTING);
294 err = dccp_v4_hash_connect(sk);
295 if (err != 0)
296 goto failure;
297
298 err = ip_route_newports(&rt, inet->sport, inet->dport, sk);
299 if (err != 0)
300 goto failure;
301
302 /* OK, now commit destination to socket. */
303 sk_setup_caps(sk, &rt->u.dst);
304
305 dp->dccps_gar =
306 dp->dccps_iss = secure_dccp_sequence_number(inet->saddr,
307 inet->daddr,
308 inet->sport,
309 usin->sin_port);
310 dccp_update_gss(sk, dp->dccps_iss);
311
312 /*
313 * SWL and AWL are initially adjusted so that they are not less than
314 * the initial Sequence Numbers received and sent, respectively:
315 * SWL := max(GSR + 1 - floor(W/4), ISR),
316 * AWL := max(GSS - W' + 1, ISS).
317 * These adjustments MUST be applied only at the beginning of the
318 * connection.
319 */
320 dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));
321
322 inet->id = dp->dccps_iss ^ jiffies;
323
324 err = dccp_connect(sk);
325 rt = NULL;
326 if (err != 0)
327 goto failure;
328out:
329 return err;
330failure:
331 /*
332 * This unhashes the socket and releases the local port, if necessary.
333 */
334 dccp_set_state(sk, DCCP_CLOSED);
335 ip_rt_put(rt);
336 sk->sk_route_caps = 0;
337 inet->dport = 0;
338 goto out;
339}
340
341/*
342 * This routine does path mtu discovery as defined in RFC1191.
343 */
344static inline void dccp_do_pmtu_discovery(struct sock *sk,
345 const struct iphdr *iph,
346 u32 mtu)
347{
348 struct dst_entry *dst;
349 const struct inet_sock *inet = inet_sk(sk);
350 const struct dccp_sock *dp = dccp_sk(sk);
351
352 /* We are not interested in DCCP_LISTEN and request_socks (RESPONSEs
353 * send out by Linux are always < 576bytes so they should go through
354 * unfragmented).
355 */
356 if (sk->sk_state == DCCP_LISTEN)
357 return;
358
359 /* We don't check in the destentry if pmtu discovery is forbidden
360 * on this route. We just assume that no packet_to_big packets
361 * are send back when pmtu discovery is not active.
362 * There is a small race when the user changes this flag in the
363 * route, but I think that's acceptable.
364 */
365 if ((dst = __sk_dst_check(sk, 0)) == NULL)
366 return;
367
368 dst->ops->update_pmtu(dst, mtu);
369
370 /* Something is about to be wrong... Remember soft error
371 * for the case, if this connection will not able to recover.
372 */
373 if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst))
374 sk->sk_err_soft = EMSGSIZE;
375
376 mtu = dst_mtu(dst);
377
378 if (inet->pmtudisc != IP_PMTUDISC_DONT &&
379 dp->dccps_pmtu_cookie > mtu) {
380 dccp_sync_mss(sk, mtu);
381
382 /*
383 * From: draft-ietf-dccp-spec-11.txt
384 *
385 * DCCP-Sync packets are the best choice for upward
386 * probing, since DCCP-Sync probes do not risk application
387 * data loss.
388 */
389 dccp_send_sync(sk, dp->dccps_gsr, DCCP_PKT_SYNC);
390 } /* else let the usual retransmit timer handle it */
391}
392
393static void dccp_v4_ctl_send_ack(struct sk_buff *rxskb)
394{
395 int err;
396 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
397 const int dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
398 sizeof(struct dccp_hdr_ext) +
399 sizeof(struct dccp_hdr_ack_bits);
400 struct sk_buff *skb;
401
402 if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL)
403 return;
404
405 skb = alloc_skb(MAX_DCCP_HEADER + 15, GFP_ATOMIC);
406 if (skb == NULL)
407 return;
408
409 /* Reserve space for headers. */
410 skb_reserve(skb, MAX_DCCP_HEADER);
411
412 skb->dst = dst_clone(rxskb->dst);
413
414 skb->h.raw = skb_push(skb, dccp_hdr_ack_len);
415 dh = dccp_hdr(skb);
416 memset(dh, 0, dccp_hdr_ack_len);
417
418 /* Build DCCP header and checksum it. */
419 dh->dccph_type = DCCP_PKT_ACK;
420 dh->dccph_sport = rxdh->dccph_dport;
421 dh->dccph_dport = rxdh->dccph_sport;
422 dh->dccph_doff = dccp_hdr_ack_len / 4;
423 dh->dccph_x = 1;
424
425 dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq);
426 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
427 DCCP_SKB_CB(rxskb)->dccpd_seq);
428
429 bh_lock_sock(dccp_ctl_socket->sk);
430 err = ip_build_and_send_pkt(skb, dccp_ctl_socket->sk,
431 rxskb->nh.iph->daddr,
432 rxskb->nh.iph->saddr, NULL);
433 bh_unlock_sock(dccp_ctl_socket->sk);
434
435 if (err == NET_XMIT_CN || err == 0) {
436 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
437 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
438 }
439}
440
441static void dccp_v4_reqsk_send_ack(struct sk_buff *skb,
442 struct request_sock *req)
443{
444 dccp_v4_ctl_send_ack(skb);
445}
446
447static int dccp_v4_send_response(struct sock *sk, struct request_sock *req,
448 struct dst_entry *dst)
449{
450 int err = -1;
451 struct sk_buff *skb;
452
453 /* First, grab a route. */
454
455 if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL)
456 goto out;
457
458 skb = dccp_make_response(sk, dst, req);
459 if (skb != NULL) {
460 const struct inet_request_sock *ireq = inet_rsk(req);
461
462 err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr,
463 ireq->rmt_addr,
464 ireq->opt);
465 if (err == NET_XMIT_CN)
466 err = 0;
467 }
468
469out:
470 dst_release(dst);
471 return err;
472}
473
474/*
475 * This routine is called by the ICMP module when it gets some sort of error
476 * condition. If err < 0 then the socket should be closed and the error
477 * returned to the user. If err > 0 it's just the icmp type << 8 | icmp code.
478 * After adjustment header points to the first 8 bytes of the tcp header. We
479 * need to find the appropriate port.
480 *
481 * The locking strategy used here is very "optimistic". When someone else
482 * accesses the socket the ICMP is just dropped and for some paths there is no
483 * check at all. A more general error queue to queue errors for later handling
484 * is probably better.
485 */
486void dccp_v4_err(struct sk_buff *skb, u32 info)
487{
488 const struct iphdr *iph = (struct iphdr *)skb->data;
489 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data +
490 (iph->ihl << 2));
491 struct dccp_sock *dp;
492 struct inet_sock *inet;
493 const int type = skb->h.icmph->type;
494 const int code = skb->h.icmph->code;
495 struct sock *sk;
496 __u64 seq;
497 int err;
498
499 if (skb->len < (iph->ihl << 2) + 8) {
500 ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
501 return;
502 }
503
504 sk = inet_lookup(&dccp_hashinfo, iph->daddr, dh->dccph_dport,
505 iph->saddr, dh->dccph_sport, inet_iif(skb));
506 if (sk == NULL) {
507 ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
508 return;
509 }
510
511 if (sk->sk_state == DCCP_TIME_WAIT) {
512 inet_twsk_put((struct inet_timewait_sock *)sk);
513 return;
514 }
515
516 bh_lock_sock(sk);
517 /* If too many ICMPs get dropped on busy
518 * servers this needs to be solved differently.
519 */
520 if (sock_owned_by_user(sk))
521 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
522
523 if (sk->sk_state == DCCP_CLOSED)
524 goto out;
525
526 dp = dccp_sk(sk);
527 seq = dccp_hdr_seq(skb);
528 if (sk->sk_state != DCCP_LISTEN &&
529 !between48(seq, dp->dccps_swl, dp->dccps_swh)) {
530 NET_INC_STATS(LINUX_MIB_OUTOFWINDOWICMPS);
531 goto out;
532 }
533
534 switch (type) {
535 case ICMP_SOURCE_QUENCH:
536 /* Just silently ignore these. */
537 goto out;
538 case ICMP_PARAMETERPROB:
539 err = EPROTO;
540 break;
541 case ICMP_DEST_UNREACH:
542 if (code > NR_ICMP_UNREACH)
543 goto out;
544
545 if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */
546 if (!sock_owned_by_user(sk))
547 dccp_do_pmtu_discovery(sk, iph, info);
548 goto out;
549 }
550
551 err = icmp_err_convert[code].errno;
552 break;
553 case ICMP_TIME_EXCEEDED:
554 err = EHOSTUNREACH;
555 break;
556 default:
557 goto out;
558 }
559
560 switch (sk->sk_state) {
561 struct request_sock *req , **prev;
562 case DCCP_LISTEN:
563 if (sock_owned_by_user(sk))
564 goto out;
565 req = inet_csk_search_req(sk, &prev, dh->dccph_dport,
566 iph->daddr, iph->saddr);
567 if (!req)
568 goto out;
569
570 /*
571 * ICMPs are not backlogged, hence we cannot get an established
572 * socket here.
573 */
574 BUG_TRAP(!req->sk);
575
576 if (seq != dccp_rsk(req)->dreq_iss) {
577 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
578 goto out;
579 }
580 /*
581 * Still in RESPOND, just remove it silently.
582 * There is no good way to pass the error to the newly
583 * created socket, and POSIX does not want network
584 * errors returned from accept().
585 */
586 inet_csk_reqsk_queue_drop(sk, req, prev);
587 goto out;
588
589 case DCCP_REQUESTING:
590 case DCCP_RESPOND:
591 if (!sock_owned_by_user(sk)) {
592 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
593 sk->sk_err = err;
594
595 sk->sk_error_report(sk);
596
597 dccp_done(sk);
598 } else
599 sk->sk_err_soft = err;
600 goto out;
601 }
602
603 /* If we've already connected we will keep trying
604 * until we time out, or the user gives up.
605 *
606 * rfc1122 4.2.3.9 allows to consider as hard errors
607 * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too,
608 * but it is obsoleted by pmtu discovery).
609 *
610 * Note, that in modern internet, where routing is unreliable
611 * and in each dark corner broken firewalls sit, sending random
612 * errors ordered by their masters even this two messages finally lose
613 * their original sense (even Linux sends invalid PORT_UNREACHs)
614 *
615 * Now we are in compliance with RFCs.
616 * --ANK (980905)
617 */
618
619 inet = inet_sk(sk);
620 if (!sock_owned_by_user(sk) && inet->recverr) {
621 sk->sk_err = err;
622 sk->sk_error_report(sk);
623 } else /* Only an error on timeout */
624 sk->sk_err_soft = err;
625out:
626 bh_unlock_sock(sk);
627 sock_put(sk);
628}
629
630int dccp_v4_send_reset(struct sock *sk, enum dccp_reset_codes code)
631{
632 struct sk_buff *skb;
633 /*
634 * FIXME: what if rebuild_header fails?
635 * Should we be doing a rebuild_header here?
636 */
637 int err = inet_sk_rebuild_header(sk);
638
639 if (err != 0)
640 return err;
641
642 skb = dccp_make_reset(sk, sk->sk_dst_cache, code);
643 if (skb != NULL) {
644 const struct dccp_sock *dp = dccp_sk(sk);
645 const struct inet_sock *inet = inet_sk(sk);
646
647 err = ip_build_and_send_pkt(skb, sk,
648 inet->saddr, inet->daddr, NULL);
649 if (err == NET_XMIT_CN)
650 err = 0;
651
652 ccid_hc_rx_exit(dp->dccps_hc_rx_ccid, sk);
653 ccid_hc_tx_exit(dp->dccps_hc_tx_ccid, sk);
654 }
655
656 return err;
657}
658
659static inline u64 dccp_v4_init_sequence(const struct sock *sk,
660 const struct sk_buff *skb)
661{
662 return secure_dccp_sequence_number(skb->nh.iph->daddr,
663 skb->nh.iph->saddr,
664 dccp_hdr(skb)->dccph_dport,
665 dccp_hdr(skb)->dccph_sport);
666}
667
668int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
669{
670 struct inet_request_sock *ireq;
671 struct dccp_sock dp;
672 struct request_sock *req;
673 struct dccp_request_sock *dreq;
674 const __u32 saddr = skb->nh.iph->saddr;
675 const __u32 daddr = skb->nh.iph->daddr;
676 struct dst_entry *dst = NULL;
677
678 /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */
679 if (((struct rtable *)skb->dst)->rt_flags &
680 (RTCF_BROADCAST | RTCF_MULTICAST))
681 goto drop;
682
683 /*
684 * TW buckets are converted to open requests without
685 * limitations, they conserve resources and peer is
686 * evidently real one.
687 */
688 if (inet_csk_reqsk_queue_is_full(sk))
689 goto drop;
690
691 /*
692 * Accept backlog is full. If we have already queued enough
693 * of warm entries in syn queue, drop request. It is better than
694 * clogging syn queue with openreqs with exponentially increasing
695 * timeout.
696 */
697 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
698 goto drop;
699
700 req = reqsk_alloc(sk->sk_prot->rsk_prot);
701 if (req == NULL)
702 goto drop;
703
704 /* FIXME: process options */
705
706 dccp_openreq_init(req, &dp, skb);
707
708 ireq = inet_rsk(req);
709 ireq->loc_addr = daddr;
710 ireq->rmt_addr = saddr;
711 /* FIXME: Merge Aristeu's option parsing code when ready */
712 req->rcv_wnd = 100; /* Fake, option parsing will get the
713 right value */
714 ireq->opt = NULL;
715
716 /*
717 * Step 3: Process LISTEN state
718 *
719 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
720 *
721 * In fact we defer setting S.GSR, S.SWL, S.SWH to
722 * dccp_create_openreq_child.
723 */
724 dreq = dccp_rsk(req);
725 dreq->dreq_isr = DCCP_SKB_CB(skb)->dccpd_seq;
726 dreq->dreq_iss = dccp_v4_init_sequence(sk, skb);
727 dreq->dreq_service = dccp_hdr_request(skb)->dccph_req_service;
728
729 if (dccp_v4_send_response(sk, req, dst))
730 goto drop_and_free;
731
732 inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
733 return 0;
734
735drop_and_free:
736 /*
737 * FIXME: should be reqsk_free after implementing req->rsk_ops
738 */
739 __reqsk_free(req);
740drop:
741 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
742 return -1;
743}
744
745/*
746 * The three way handshake has completed - we got a valid ACK or DATAACK -
747 * now create the new socket.
748 *
749 * This is the equivalent of TCP's tcp_v4_syn_recv_sock
750 */
751struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb,
752 struct request_sock *req,
753 struct dst_entry *dst)
754{
755 struct inet_request_sock *ireq;
756 struct inet_sock *newinet;
757 struct dccp_sock *newdp;
758 struct sock *newsk;
759
760 if (sk_acceptq_is_full(sk))
761 goto exit_overflow;
762
763 if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL)
764 goto exit;
765
766 newsk = dccp_create_openreq_child(sk, req, skb);
767 if (newsk == NULL)
768 goto exit;
769
770 sk_setup_caps(newsk, dst);
771
772 newdp = dccp_sk(newsk);
773 newinet = inet_sk(newsk);
774 ireq = inet_rsk(req);
775 newinet->daddr = ireq->rmt_addr;
776 newinet->rcv_saddr = ireq->loc_addr;
777 newinet->saddr = ireq->loc_addr;
778 newinet->opt = ireq->opt;
779 ireq->opt = NULL;
780 newinet->mc_index = inet_iif(skb);
781 newinet->mc_ttl = skb->nh.iph->ttl;
782 newinet->id = jiffies;
783
784 dccp_sync_mss(newsk, dst_mtu(dst));
785
786 __inet_hash(&dccp_hashinfo, newsk, 0);
787 __inet_inherit_port(&dccp_hashinfo, sk, newsk);
788
789 return newsk;
790
791exit_overflow:
792 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
793exit:
794 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
795 dst_release(dst);
796 return NULL;
797}
798
799static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
800{
801 const struct dccp_hdr *dh = dccp_hdr(skb);
802 const struct iphdr *iph = skb->nh.iph;
803 struct sock *nsk;
804 struct request_sock **prev;
805 /* Find possible connection requests. */
806 struct request_sock *req = inet_csk_search_req(sk, &prev,
807 dh->dccph_sport,
808 iph->saddr, iph->daddr);
809 if (req != NULL)
810 return dccp_check_req(sk, skb, req, prev);
811
812 nsk = __inet_lookup_established(&dccp_hashinfo,
813 iph->saddr, dh->dccph_sport,
814 iph->daddr, ntohs(dh->dccph_dport),
815 inet_iif(skb));
816 if (nsk != NULL) {
817 if (nsk->sk_state != DCCP_TIME_WAIT) {
818 bh_lock_sock(nsk);
819 return nsk;
820 }
821 inet_twsk_put((struct inet_timewait_sock *)nsk);
822 return NULL;
823 }
824
825 return sk;
826}
827
828int dccp_v4_checksum(const struct sk_buff *skb, const u32 saddr,
829 const u32 daddr)
830{
831 const struct dccp_hdr* dh = dccp_hdr(skb);
832 int checksum_len;
833 u32 tmp;
834
835 if (dh->dccph_cscov == 0)
836 checksum_len = skb->len;
837 else {
838 checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32);
839 checksum_len = checksum_len < skb->len ? checksum_len :
840 skb->len;
841 }
842
843 tmp = csum_partial((unsigned char *)dh, checksum_len, 0);
844 return csum_tcpudp_magic(saddr, daddr, checksum_len,
845 IPPROTO_DCCP, tmp);
846}
847
848static int dccp_v4_verify_checksum(struct sk_buff *skb,
849 const u32 saddr, const u32 daddr)
850{
851 struct dccp_hdr *dh = dccp_hdr(skb);
852 int checksum_len;
853 u32 tmp;
854
855 if (dh->dccph_cscov == 0)
856 checksum_len = skb->len;
857 else {
858 checksum_len = (dh->dccph_cscov + dh->dccph_x) * sizeof(u32);
859 checksum_len = checksum_len < skb->len ? checksum_len :
860 skb->len;
861 }
862 tmp = csum_partial((unsigned char *)dh, checksum_len, 0);
863 return csum_tcpudp_magic(saddr, daddr, checksum_len,
864 IPPROTO_DCCP, tmp) == 0 ? 0 : -1;
865}
866
867static struct dst_entry* dccp_v4_route_skb(struct sock *sk,
868 struct sk_buff *skb)
869{
870 struct rtable *rt;
871 struct flowi fl = { .oif = ((struct rtable *)skb->dst)->rt_iif,
872 .nl_u = { .ip4_u =
873 { .daddr = skb->nh.iph->saddr,
874 .saddr = skb->nh.iph->daddr,
875 .tos = RT_CONN_FLAGS(sk) } },
876 .proto = sk->sk_protocol,
877 .uli_u = { .ports =
878 { .sport = dccp_hdr(skb)->dccph_dport,
879 .dport = dccp_hdr(skb)->dccph_sport }
880 }
881 };
882
883 if (ip_route_output_flow(&rt, &fl, sk, 0)) {
884 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
885 return NULL;
886 }
887
888 return &rt->u.dst;
889}
890
891static void dccp_v4_ctl_send_reset(struct sk_buff *rxskb)
892{
893 int err;
894 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
895 const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
896 sizeof(struct dccp_hdr_ext) +
897 sizeof(struct dccp_hdr_reset);
898 struct sk_buff *skb;
899 struct dst_entry *dst;
900 u64 seqno;
901
902 /* Never send a reset in response to a reset. */
903 if (rxdh->dccph_type == DCCP_PKT_RESET)
904 return;
905
906 if (((struct rtable *)rxskb->dst)->rt_type != RTN_LOCAL)
907 return;
908
909 dst = dccp_v4_route_skb(dccp_ctl_socket->sk, rxskb);
910 if (dst == NULL)
911 return;
912
913 skb = alloc_skb(MAX_DCCP_HEADER + 15, GFP_ATOMIC);
914 if (skb == NULL)
915 goto out;
916
917 /* Reserve space for headers. */
918 skb_reserve(skb, MAX_DCCP_HEADER);
919 skb->dst = dst_clone(dst);
920
921 skb->h.raw = skb_push(skb, dccp_hdr_reset_len);
922 dh = dccp_hdr(skb);
923 memset(dh, 0, dccp_hdr_reset_len);
924
925 /* Build DCCP header and checksum it. */
926 dh->dccph_type = DCCP_PKT_RESET;
927 dh->dccph_sport = rxdh->dccph_dport;
928 dh->dccph_dport = rxdh->dccph_sport;
929 dh->dccph_doff = dccp_hdr_reset_len / 4;
930 dh->dccph_x = 1;
931 dccp_hdr_reset(skb)->dccph_reset_code =
932 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
933
934 /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */
935 seqno = 0;
936 if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
937 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
938
939 dccp_hdr_set_seq(dh, seqno);
940 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
941 DCCP_SKB_CB(rxskb)->dccpd_seq);
942
943 dh->dccph_checksum = dccp_v4_checksum(skb, rxskb->nh.iph->saddr,
944 rxskb->nh.iph->daddr);
945
946 bh_lock_sock(dccp_ctl_socket->sk);
947 err = ip_build_and_send_pkt(skb, dccp_ctl_socket->sk,
948 rxskb->nh.iph->daddr,
949 rxskb->nh.iph->saddr, NULL);
950 bh_unlock_sock(dccp_ctl_socket->sk);
951
952 if (err == NET_XMIT_CN || err == 0) {
953 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
954 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
955 }
956out:
957 dst_release(dst);
958}
959
960int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
961{
962 struct dccp_hdr *dh = dccp_hdr(skb);
963
964 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
965 if (dccp_rcv_established(sk, skb, dh, skb->len))
966 goto reset;
967 return 0;
968 }
969
970 /*
971 * Step 3: Process LISTEN state
972 * If S.state == LISTEN,
973 * If P.type == Request or P contains a valid Init Cookie
974 * option,
975 * * Must scan the packet's options to check for an Init
976 * Cookie. Only the Init Cookie is processed here,
977 * however; other options are processed in Step 8. This
978 * scan need only be performed if the endpoint uses Init
979 * Cookies *
980 * * Generate a new socket and switch to that socket *
981 * Set S := new socket for this port pair
982 * S.state = RESPOND
983 * Choose S.ISS (initial seqno) or set from Init Cookie
984 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
985 * Continue with S.state == RESPOND
986 * * A Response packet will be generated in Step 11 *
987 * Otherwise,
988 * Generate Reset(No Connection) unless P.type == Reset
989 * Drop packet and return
990 *
991 * NOTE: the check for the packet types is done in
992 * dccp_rcv_state_process
993 */
994 if (sk->sk_state == DCCP_LISTEN) {
995 struct sock *nsk = dccp_v4_hnd_req(sk, skb);
996
997 if (nsk == NULL)
998 goto discard;
999
1000 if (nsk != sk) {
1001 if (dccp_child_process(sk, nsk, skb))
1002 goto reset;
1003 return 0;
1004 }
1005 }
1006
1007 if (dccp_rcv_state_process(sk, skb, dh, skb->len))
1008 goto reset;
1009 return 0;
1010
1011reset:
1012 DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_NO_CONNECTION;
1013 dccp_v4_ctl_send_reset(skb);
1014discard:
1015 kfree_skb(skb);
1016 return 0;
1017}
1018
1019static inline int dccp_invalid_packet(struct sk_buff *skb)
1020{
1021 const struct dccp_hdr *dh;
1022
1023 if (skb->pkt_type != PACKET_HOST)
1024 return 1;
1025
1026 if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) {
1027 LIMIT_NETDEBUG(KERN_WARNING "DCCP: pskb_may_pull failed\n");
1028 return 1;
1029 }
1030
1031 dh = dccp_hdr(skb);
1032
1033 /* If the packet type is not understood, drop packet and return */
1034 if (dh->dccph_type >= DCCP_PKT_INVALID) {
1035 LIMIT_NETDEBUG(KERN_WARNING "DCCP: invalid packet type\n");
1036 return 1;
1037 }
1038
1039 /*
1040 * If P.Data Offset is too small for packet type, or too large for
1041 * packet, drop packet and return
1042 */
1043 if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) {
1044 LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) "
1045 "too small 1\n",
1046 dh->dccph_doff);
1047 return 1;
1048 }
1049
1050 if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) {
1051 LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) "
1052 "too small 2\n",
1053 dh->dccph_doff);
1054 return 1;
1055 }
1056
1057 dh = dccp_hdr(skb);
1058
1059 /*
1060 * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet
1061 * has short sequence numbers), drop packet and return
1062 */
1063 if (dh->dccph_x == 0 &&
1064 dh->dccph_type != DCCP_PKT_DATA &&
1065 dh->dccph_type != DCCP_PKT_ACK &&
1066 dh->dccph_type != DCCP_PKT_DATAACK) {
1067 LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.type (%s) not Data, Ack "
1068 "nor DataAck and P.X == 0\n",
1069 dccp_packet_name(dh->dccph_type));
1070 return 1;
1071 }
1072
1073 /* If the header checksum is incorrect, drop packet and return */
1074 if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr,
1075 skb->nh.iph->daddr) < 0) {
1076 LIMIT_NETDEBUG(KERN_WARNING "DCCP: header checksum is "
1077 "incorrect\n");
1078 return 1;
1079 }
1080
1081 return 0;
1082}
1083
1084/* this is called when real data arrives */
1085int dccp_v4_rcv(struct sk_buff *skb)
1086{
1087 const struct dccp_hdr *dh;
1088 struct sock *sk;
1089 int rc;
1090
1091 /* Step 1: Check header basics: */
1092
1093 if (dccp_invalid_packet(skb))
1094 goto discard_it;
1095
1096 dh = dccp_hdr(skb);
1097#if 0
1098 /*
1099 * Use something like this to simulate some DATA/DATAACK loss to test
1100 * dccp_ackpkts_add, you'll get something like this on a session that
1101 * sends 10 DATA/DATAACK packets:
1102 *
1103 * ackpkts_print: 281473596467422 |0,0|3,0|0,0|3,0|0,0|3,0|0,0|3,0|0,1|
1104 *
1105 * 0, 0 means: DCCP_ACKPKTS_STATE_RECEIVED, RLE == just this packet
1106 * 0, 1 means: DCCP_ACKPKTS_STATE_RECEIVED, RLE == two adjacent packets
1107 * with the same state
1108 * 3, 0 means: DCCP_ACKPKTS_STATE_NOT_RECEIVED, RLE == just this packet
1109 *
1110 * So...
1111 *
1112 * 281473596467422 was received
1113 * 281473596467421 was not received
1114 * 281473596467420 was received
1115 * 281473596467419 was not received
1116 * 281473596467418 was received
1117 * 281473596467417 was not received
1118 * 281473596467416 was received
1119 * 281473596467415 was not received
1120 * 281473596467414 was received
1121 * 281473596467413 was received (this one was the 3way handshake
1122 * RESPONSE)
1123 *
1124 */
1125 if (dh->dccph_type == DCCP_PKT_DATA ||
1126 dh->dccph_type == DCCP_PKT_DATAACK) {
1127 static int discard = 0;
1128
1129 if (discard) {
1130 discard = 0;
1131 goto discard_it;
1132 }
1133 discard = 1;
1134 }
1135#endif
1136 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
1137 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
1138
1139 dccp_pr_debug("%8.8s "
1140 "src=%u.%u.%u.%u@%-5d "
1141 "dst=%u.%u.%u.%u@%-5d seq=%llu",
1142 dccp_packet_name(dh->dccph_type),
1143 NIPQUAD(skb->nh.iph->saddr), ntohs(dh->dccph_sport),
1144 NIPQUAD(skb->nh.iph->daddr), ntohs(dh->dccph_dport),
1145 (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq);
1146
1147 if (dccp_packet_without_ack(skb)) {
1148 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
1149 dccp_pr_debug_cat("\n");
1150 } else {
1151 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
1152 dccp_pr_debug_cat(", ack=%llu\n",
1153 (unsigned long long)
1154 DCCP_SKB_CB(skb)->dccpd_ack_seq);
1155 }
1156
1157 /* Step 2:
1158 * Look up flow ID in table and get corresponding socket */
1159 sk = __inet_lookup(&dccp_hashinfo,
1160 skb->nh.iph->saddr, dh->dccph_sport,
1161 skb->nh.iph->daddr, ntohs(dh->dccph_dport),
1162 inet_iif(skb));
1163
1164 /*
1165 * Step 2:
1166 * If no socket ...
1167 * Generate Reset(No Connection) unless P.type == Reset
1168 * Drop packet and return
1169 */
1170 if (sk == NULL) {
1171 dccp_pr_debug("failed to look up flow ID in table and "
1172 "get corresponding socket\n");
1173 goto no_dccp_socket;
1174 }
1175
1176 /*
1177 * Step 2:
1178 * ... or S.state == TIMEWAIT,
1179 * Generate Reset(No Connection) unless P.type == Reset
1180 * Drop packet and return
1181 */
1182
1183 if (sk->sk_state == DCCP_TIME_WAIT) {
1184 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: "
1185 "do_time_wait\n");
1186 goto do_time_wait;
1187 }
1188
1189 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
1190 dccp_pr_debug("xfrm4_policy_check failed\n");
1191 goto discard_and_relse;
1192 }
1193
1194 if (sk_filter(sk, skb, 0)) {
1195 dccp_pr_debug("sk_filter failed\n");
1196 goto discard_and_relse;
1197 }
1198
1199 skb->dev = NULL;
1200
1201 bh_lock_sock(sk);
1202 rc = 0;
1203 if (!sock_owned_by_user(sk))
1204 rc = dccp_v4_do_rcv(sk, skb);
1205 else
1206 sk_add_backlog(sk, skb);
1207 bh_unlock_sock(sk);
1208
1209 sock_put(sk);
1210 return rc;
1211
1212no_dccp_socket:
1213 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
1214 goto discard_it;
1215 /*
1216 * Step 2:
1217 * Generate Reset(No Connection) unless P.type == Reset
1218 * Drop packet and return
1219 */
1220 if (dh->dccph_type != DCCP_PKT_RESET) {
1221 DCCP_SKB_CB(skb)->dccpd_reset_code =
1222 DCCP_RESET_CODE_NO_CONNECTION;
1223 dccp_v4_ctl_send_reset(skb);
1224 }
1225
1226discard_it:
1227 /* Discard frame. */
1228 kfree_skb(skb);
1229 return 0;
1230
1231discard_and_relse:
1232 sock_put(sk);
1233 goto discard_it;
1234
1235do_time_wait:
1236 inet_twsk_put((struct inet_timewait_sock *)sk);
1237 goto no_dccp_socket;
1238}
1239
1240static int dccp_v4_init_sock(struct sock *sk)
1241{
1242 struct dccp_sock *dp = dccp_sk(sk);
1243 static int dccp_ctl_socket_init = 1;
1244
1245 dccp_options_init(&dp->dccps_options);
1246
1247 if (dp->dccps_options.dccpo_send_ack_vector) {
1248 dp->dccps_hc_rx_ackpkts =
1249 dccp_ackpkts_alloc(DCCP_MAX_ACK_VECTOR_LEN,
1250 GFP_KERNEL);
1251
1252 if (dp->dccps_hc_rx_ackpkts == NULL)
1253 return -ENOMEM;
1254 }
1255
1256 /*
1257 * FIXME: We're hardcoding the CCID, and doing this at this point makes
1258 * the listening (master) sock get CCID control blocks, which is not
1259 * necessary, but for now, to not mess with the test userspace apps,
1260 * lets leave it here, later the real solution is to do this in a
1261 * setsockopt(CCIDs-I-want/accept). -acme
1262 */
1263 if (likely(!dccp_ctl_socket_init)) {
1264 dp->dccps_hc_rx_ccid = ccid_init(dp->dccps_options.dccpo_ccid,
1265 sk);
1266 dp->dccps_hc_tx_ccid = ccid_init(dp->dccps_options.dccpo_ccid,
1267 sk);
1268 if (dp->dccps_hc_rx_ccid == NULL ||
1269 dp->dccps_hc_tx_ccid == NULL) {
1270 ccid_exit(dp->dccps_hc_rx_ccid, sk);
1271 ccid_exit(dp->dccps_hc_tx_ccid, sk);
1272 dccp_ackpkts_free(dp->dccps_hc_rx_ackpkts);
1273 dp->dccps_hc_rx_ackpkts = NULL;
1274 dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
1275 return -ENOMEM;
1276 }
1277 } else
1278 dccp_ctl_socket_init = 0;
1279
1280 dccp_init_xmit_timers(sk);
1281 inet_csk(sk)->icsk_rto = DCCP_TIMEOUT_INIT;
1282 sk->sk_state = DCCP_CLOSED;
1283 sk->sk_write_space = dccp_write_space;
1284 dp->dccps_mss_cache = 536;
1285 dp->dccps_role = DCCP_ROLE_UNDEFINED;
1286
1287 return 0;
1288}
1289
1290static int dccp_v4_destroy_sock(struct sock *sk)
1291{
1292 struct dccp_sock *dp = dccp_sk(sk);
1293
1294 /*
1295 * DCCP doesn't use sk_qrite_queue, just sk_send_head
1296 * for retransmissions
1297 */
1298 if (sk->sk_send_head != NULL) {
1299 kfree_skb(sk->sk_send_head);
1300 sk->sk_send_head = NULL;
1301 }
1302
1303 /* Clean up a referenced DCCP bind bucket. */
1304 if (inet_csk(sk)->icsk_bind_hash != NULL)
1305 inet_put_port(&dccp_hashinfo, sk);
1306
1307 ccid_hc_rx_exit(dp->dccps_hc_rx_ccid, sk);
1308 ccid_hc_tx_exit(dp->dccps_hc_tx_ccid, sk);
1309 dccp_ackpkts_free(dp->dccps_hc_rx_ackpkts);
1310 dp->dccps_hc_rx_ackpkts = NULL;
1311 ccid_exit(dp->dccps_hc_rx_ccid, sk);
1312 ccid_exit(dp->dccps_hc_tx_ccid, sk);
1313 dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
1314
1315 return 0;
1316}
1317
1318static void dccp_v4_reqsk_destructor(struct request_sock *req)
1319{
1320 kfree(inet_rsk(req)->opt);
1321}
1322
1323static struct request_sock_ops dccp_request_sock_ops = {
1324 .family = PF_INET,
1325 .obj_size = sizeof(struct dccp_request_sock),
1326 .rtx_syn_ack = dccp_v4_send_response,
1327 .send_ack = dccp_v4_reqsk_send_ack,
1328 .destructor = dccp_v4_reqsk_destructor,
1329 .send_reset = dccp_v4_ctl_send_reset,
1330};
1331
1332struct proto dccp_v4_prot = {
1333 .name = "DCCP",
1334 .owner = THIS_MODULE,
1335 .close = dccp_close,
1336 .connect = dccp_v4_connect,
1337 .disconnect = dccp_disconnect,
1338 .ioctl = dccp_ioctl,
1339 .init = dccp_v4_init_sock,
1340 .setsockopt = dccp_setsockopt,
1341 .getsockopt = dccp_getsockopt,
1342 .sendmsg = dccp_sendmsg,
1343 .recvmsg = dccp_recvmsg,
1344 .backlog_rcv = dccp_v4_do_rcv,
1345 .hash = dccp_v4_hash,
1346 .unhash = dccp_v4_unhash,
1347 .accept = inet_csk_accept,
1348 .get_port = dccp_v4_get_port,
1349 .shutdown = dccp_shutdown,
1350 .destroy = dccp_v4_destroy_sock,
1351 .orphan_count = &dccp_orphan_count,
1352 .max_header = MAX_DCCP_HEADER,
1353 .obj_size = sizeof(struct dccp_sock),
1354 .rsk_prot = &dccp_request_sock_ops,
1355 .twsk_obj_size = sizeof(struct inet_timewait_sock),
1356};
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-27 00:56:59 -0500