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15#include <linux/module.h>
16#include <linux/random.h>
17#include <linux/slab.h>
18#include <linux/xfrm.h>
19
20#include <net/addrconf.h>
21#include <net/inet_common.h>
22#include <net/inet_hashtables.h>
23#include <net/inet_sock.h>
24#include <net/inet6_connection_sock.h>
25#include <net/inet6_hashtables.h>
26#include <net/ip6_route.h>
27#include <net/ipv6.h>
28#include <net/protocol.h>
29#include <net/transp_v6.h>
30#include <net/ip6_checksum.h>
31#include <net/xfrm.h>
32#include <net/secure_seq.h>
33
34#include "dccp.h"
35#include "ipv6.h"
36#include "feat.h"
37
38
39
40static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
41static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
42
43static void dccp_v6_hash(struct sock *sk)
44{
45 if (sk->sk_state != DCCP_CLOSED) {
46 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
47 inet_hash(sk);
48 return;
49 }
50 local_bh_disable();
51 __inet6_hash(sk, NULL);
52 local_bh_enable();
53 }
54}
55
56
57static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
58 const struct in6_addr *saddr,
59 const struct in6_addr *daddr)
60{
61 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
62}
63
64static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
65{
66 struct ipv6_pinfo *np = inet6_sk(sk);
67 struct dccp_hdr *dh = dccp_hdr(skb);
68
69 dccp_csum_outgoing(skb);
70 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
71}
72
73static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb)
74{
75 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
76 ipv6_hdr(skb)->saddr.s6_addr32,
77 dccp_hdr(skb)->dccph_dport,
78 dccp_hdr(skb)->dccph_sport );
79
80}
81
82static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
83 u8 type, u8 code, int offset, __be32 info)
84{
85 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
86 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
87 struct dccp_sock *dp;
88 struct ipv6_pinfo *np;
89 struct sock *sk;
90 int err;
91 __u64 seq;
92 struct net *net = dev_net(skb->dev);
93
94 if (skb->len < offset + sizeof(*dh) ||
95 skb->len < offset + __dccp_basic_hdr_len(dh)) {
96 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
97 ICMP6_MIB_INERRORS);
98 return;
99 }
100
101 sk = inet6_lookup(net, &dccp_hashinfo,
102 &hdr->daddr, dh->dccph_dport,
103 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
104
105 if (sk == NULL) {
106 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
107 ICMP6_MIB_INERRORS);
108 return;
109 }
110
111 if (sk->sk_state == DCCP_TIME_WAIT) {
112 inet_twsk_put(inet_twsk(sk));
113 return;
114 }
115
116 bh_lock_sock(sk);
117 if (sock_owned_by_user(sk))
118 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
119
120 if (sk->sk_state == DCCP_CLOSED)
121 goto out;
122
123 dp = dccp_sk(sk);
124 seq = dccp_hdr_seq(dh);
125 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
126 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
127 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
128 goto out;
129 }
130
131 np = inet6_sk(sk);
132
133 if (type == NDISC_REDIRECT) {
134 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
135
136 if (dst)
137 dst->ops->redirect(dst, sk, skb);
138 }
139
140 if (type == ICMPV6_PKT_TOOBIG) {
141 struct dst_entry *dst = NULL;
142
143 if (sock_owned_by_user(sk))
144 goto out;
145 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
146 goto out;
147
148 dst = inet6_csk_update_pmtu(sk, ntohl(info));
149 if (!dst)
150 goto out;
151
152 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
153 dccp_sync_mss(sk, dst_mtu(dst));
154 goto out;
155 }
156
157 icmpv6_err_convert(type, code, &err);
158
159
160 switch (sk->sk_state) {
161 struct request_sock *req, **prev;
162 case DCCP_LISTEN:
163 if (sock_owned_by_user(sk))
164 goto out;
165
166 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
167 &hdr->daddr, &hdr->saddr,
168 inet6_iif(skb));
169 if (req == NULL)
170 goto out;
171
172
173
174
175
176 WARN_ON(req->sk != NULL);
177
178 if (!between48(seq, dccp_rsk(req)->dreq_iss,
179 dccp_rsk(req)->dreq_gss)) {
180 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
181 goto out;
182 }
183
184 inet_csk_reqsk_queue_drop(sk, req, prev);
185 goto out;
186
187 case DCCP_REQUESTING:
188 case DCCP_RESPOND:
189
190 if (!sock_owned_by_user(sk)) {
191 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
192 sk->sk_err = err;
193
194
195
196
197 sk->sk_error_report(sk);
198 dccp_done(sk);
199 } else
200 sk->sk_err_soft = err;
201 goto out;
202 }
203
204 if (!sock_owned_by_user(sk) && np->recverr) {
205 sk->sk_err = err;
206 sk->sk_error_report(sk);
207 } else
208 sk->sk_err_soft = err;
209
210out:
211 bh_unlock_sock(sk);
212 sock_put(sk);
213}
214
215
216static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
217 struct request_values *rv_unused)
218{
219 struct inet6_request_sock *ireq6 = inet6_rsk(req);
220 struct ipv6_pinfo *np = inet6_sk(sk);
221 struct sk_buff *skb;
222 struct in6_addr *final_p, final;
223 struct flowi6 fl6;
224 int err = -1;
225 struct dst_entry *dst;
226
227 memset(&fl6, 0, sizeof(fl6));
228 fl6.flowi6_proto = IPPROTO_DCCP;
229 fl6.daddr = ireq6->rmt_addr;
230 fl6.saddr = ireq6->loc_addr;
231 fl6.flowlabel = 0;
232 fl6.flowi6_oif = ireq6->iif;
233 fl6.fl6_dport = inet_rsk(req)->rmt_port;
234 fl6.fl6_sport = inet_rsk(req)->loc_port;
235 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
236
237
238 final_p = fl6_update_dst(&fl6, np->opt, &final);
239
240 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
241 if (IS_ERR(dst)) {
242 err = PTR_ERR(dst);
243 dst = NULL;
244 goto done;
245 }
246
247 skb = dccp_make_response(sk, dst, req);
248 if (skb != NULL) {
249 struct dccp_hdr *dh = dccp_hdr(skb);
250
251 dh->dccph_checksum = dccp_v6_csum_finish(skb,
252 &ireq6->loc_addr,
253 &ireq6->rmt_addr);
254 fl6.daddr = ireq6->rmt_addr;
255 err = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass);
256 err = net_xmit_eval(err);
257 }
258
259done:
260 dst_release(dst);
261 return err;
262}
263
264static void dccp_v6_reqsk_destructor(struct request_sock *req)
265{
266 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
267 if (inet6_rsk(req)->pktopts != NULL)
268 kfree_skb(inet6_rsk(req)->pktopts);
269}
270
271static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
272{
273 const struct ipv6hdr *rxip6h;
274 struct sk_buff *skb;
275 struct flowi6 fl6;
276 struct net *net = dev_net(skb_dst(rxskb)->dev);
277 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
278 struct dst_entry *dst;
279
280 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
281 return;
282
283 if (!ipv6_unicast_destination(rxskb))
284 return;
285
286 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
287 if (skb == NULL)
288 return;
289
290 rxip6h = ipv6_hdr(rxskb);
291 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
292 &rxip6h->daddr);
293
294 memset(&fl6, 0, sizeof(fl6));
295 fl6.daddr = rxip6h->saddr;
296 fl6.saddr = rxip6h->daddr;
297
298 fl6.flowi6_proto = IPPROTO_DCCP;
299 fl6.flowi6_oif = inet6_iif(rxskb);
300 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
301 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
302 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
303
304
305 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
306 if (!IS_ERR(dst)) {
307 skb_dst_set(skb, dst);
308 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
309 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
310 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
311 return;
312 }
313
314 kfree_skb(skb);
315}
316
317static struct request_sock_ops dccp6_request_sock_ops = {
318 .family = AF_INET6,
319 .obj_size = sizeof(struct dccp6_request_sock),
320 .rtx_syn_ack = dccp_v6_send_response,
321 .send_ack = dccp_reqsk_send_ack,
322 .destructor = dccp_v6_reqsk_destructor,
323 .send_reset = dccp_v6_ctl_send_reset,
324 .syn_ack_timeout = dccp_syn_ack_timeout,
325};
326
327static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
328{
329 const struct dccp_hdr *dh = dccp_hdr(skb);
330 const struct ipv6hdr *iph = ipv6_hdr(skb);
331 struct sock *nsk;
332 struct request_sock **prev;
333
334 struct request_sock *req = inet6_csk_search_req(sk, &prev,
335 dh->dccph_sport,
336 &iph->saddr,
337 &iph->daddr,
338 inet6_iif(skb));
339 if (req != NULL)
340 return dccp_check_req(sk, skb, req, prev);
341
342 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
343 &iph->saddr, dh->dccph_sport,
344 &iph->daddr, ntohs(dh->dccph_dport),
345 inet6_iif(skb));
346 if (nsk != NULL) {
347 if (nsk->sk_state != DCCP_TIME_WAIT) {
348 bh_lock_sock(nsk);
349 return nsk;
350 }
351 inet_twsk_put(inet_twsk(nsk));
352 return NULL;
353 }
354
355 return sk;
356}
357
358static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
359{
360 struct request_sock *req;
361 struct dccp_request_sock *dreq;
362 struct inet6_request_sock *ireq6;
363 struct ipv6_pinfo *np = inet6_sk(sk);
364 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
365 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
366
367 if (skb->protocol == htons(ETH_P_IP))
368 return dccp_v4_conn_request(sk, skb);
369
370 if (!ipv6_unicast_destination(skb))
371 return 0;
372
373 if (dccp_bad_service_code(sk, service)) {
374 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
375 goto drop;
376 }
377
378
379
380 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
381 if (inet_csk_reqsk_queue_is_full(sk))
382 goto drop;
383
384 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
385 goto drop;
386
387 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
388 if (req == NULL)
389 goto drop;
390
391 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
392 goto drop_and_free;
393
394 dreq = dccp_rsk(req);
395 if (dccp_parse_options(sk, dreq, skb))
396 goto drop_and_free;
397
398 if (security_inet_conn_request(sk, skb, req))
399 goto drop_and_free;
400
401 ireq6 = inet6_rsk(req);
402 ireq6->rmt_addr = ipv6_hdr(skb)->saddr;
403 ireq6->loc_addr = ipv6_hdr(skb)->daddr;
404
405 if (ipv6_opt_accepted(sk, skb) ||
406 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
407 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
408 atomic_inc(&skb->users);
409 ireq6->pktopts = skb;
410 }
411 ireq6->iif = sk->sk_bound_dev_if;
412
413
414 if (!sk->sk_bound_dev_if &&
415 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
416 ireq6->iif = inet6_iif(skb);
417
418
419
420
421
422
423
424
425 dreq->dreq_isr = dcb->dccpd_seq;
426 dreq->dreq_gsr = dreq->dreq_isr;
427 dreq->dreq_iss = dccp_v6_init_sequence(skb);
428 dreq->dreq_gss = dreq->dreq_iss;
429 dreq->dreq_service = service;
430
431 if (dccp_v6_send_response(sk, req, NULL))
432 goto drop_and_free;
433
434 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
435 return 0;
436
437drop_and_free:
438 reqsk_free(req);
439drop:
440 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
441 return -1;
442}
443
444static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
445 struct sk_buff *skb,
446 struct request_sock *req,
447 struct dst_entry *dst)
448{
449 struct inet6_request_sock *ireq6 = inet6_rsk(req);
450 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
451 struct inet_sock *newinet;
452 struct dccp6_sock *newdp6;
453 struct sock *newsk;
454
455 if (skb->protocol == htons(ETH_P_IP)) {
456
457
458
459 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
460 if (newsk == NULL)
461 return NULL;
462
463 newdp6 = (struct dccp6_sock *)newsk;
464 newinet = inet_sk(newsk);
465 newinet->pinet6 = &newdp6->inet6;
466 newnp = inet6_sk(newsk);
467
468 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
469
470 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
471
472 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
473
474 newnp->rcv_saddr = newnp->saddr;
475
476 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
477 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
478 newnp->pktoptions = NULL;
479 newnp->opt = NULL;
480 newnp->mcast_oif = inet6_iif(skb);
481 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
482
483
484
485
486
487
488
489
490
491
492
493 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
494
495 return newsk;
496 }
497
498
499 if (sk_acceptq_is_full(sk))
500 goto out_overflow;
501
502 if (dst == NULL) {
503 struct in6_addr *final_p, final;
504 struct flowi6 fl6;
505
506 memset(&fl6, 0, sizeof(fl6));
507 fl6.flowi6_proto = IPPROTO_DCCP;
508 fl6.daddr = ireq6->rmt_addr;
509 final_p = fl6_update_dst(&fl6, np->opt, &final);
510 fl6.saddr = ireq6->loc_addr;
511 fl6.flowi6_oif = sk->sk_bound_dev_if;
512 fl6.fl6_dport = inet_rsk(req)->rmt_port;
513 fl6.fl6_sport = inet_rsk(req)->loc_port;
514 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
515
516 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
517 if (IS_ERR(dst))
518 goto out;
519 }
520
521 newsk = dccp_create_openreq_child(sk, req, skb);
522 if (newsk == NULL)
523 goto out_nonewsk;
524
525
526
527
528
529
530
531 __ip6_dst_store(newsk, dst, NULL, NULL);
532 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
533 NETIF_F_TSO);
534 newdp6 = (struct dccp6_sock *)newsk;
535 newinet = inet_sk(newsk);
536 newinet->pinet6 = &newdp6->inet6;
537 newnp = inet6_sk(newsk);
538
539 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
540
541 newnp->daddr = ireq6->rmt_addr;
542 newnp->saddr = ireq6->loc_addr;
543 newnp->rcv_saddr = ireq6->loc_addr;
544 newsk->sk_bound_dev_if = ireq6->iif;
545
546
547
548
549
550 newinet->inet_opt = NULL;
551
552
553 newnp->rxopt.all = np->rxopt.all;
554
555
556 newnp->pktoptions = NULL;
557 if (ireq6->pktopts != NULL) {
558 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
559 consume_skb(ireq6->pktopts);
560 ireq6->pktopts = NULL;
561 if (newnp->pktoptions)
562 skb_set_owner_r(newnp->pktoptions, newsk);
563 }
564 newnp->opt = NULL;
565 newnp->mcast_oif = inet6_iif(skb);
566 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
567
568
569
570
571
572
573
574 if (np->opt != NULL)
575 newnp->opt = ipv6_dup_options(newsk, np->opt);
576
577 inet_csk(newsk)->icsk_ext_hdr_len = 0;
578 if (newnp->opt != NULL)
579 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
580 newnp->opt->opt_flen);
581
582 dccp_sync_mss(newsk, dst_mtu(dst));
583
584 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
585 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
586
587 if (__inet_inherit_port(sk, newsk) < 0) {
588 inet_csk_prepare_forced_close(newsk);
589 dccp_done(newsk);
590 goto out;
591 }
592 __inet6_hash(newsk, NULL);
593
594 return newsk;
595
596out_overflow:
597 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
598out_nonewsk:
599 dst_release(dst);
600out:
601 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
602 return NULL;
603}
604
605
606
607
608
609
610
611
612
613static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
614{
615 struct ipv6_pinfo *np = inet6_sk(sk);
616 struct sk_buff *opt_skb = NULL;
617
618
619
620
621
622
623
624
625
626 if (skb->protocol == htons(ETH_P_IP))
627 return dccp_v4_do_rcv(sk, skb);
628
629 if (sk_filter(sk, skb))
630 goto discard;
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650 if (np->rxopt.all)
651
652
653
654
655 opt_skb = skb_clone(skb, GFP_ATOMIC);
656
657 if (sk->sk_state == DCCP_OPEN) {
658 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
659 goto reset;
660 if (opt_skb) {
661
662 __kfree_skb(opt_skb);
663 }
664 return 0;
665 }
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691 if (sk->sk_state == DCCP_LISTEN) {
692 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
693
694 if (nsk == NULL)
695 goto discard;
696
697
698
699
700
701 if (nsk != sk) {
702 if (dccp_child_process(sk, nsk, skb))
703 goto reset;
704 if (opt_skb != NULL)
705 __kfree_skb(opt_skb);
706 return 0;
707 }
708 }
709
710 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
711 goto reset;
712 if (opt_skb) {
713
714 __kfree_skb(opt_skb);
715 }
716 return 0;
717
718reset:
719 dccp_v6_ctl_send_reset(sk, skb);
720discard:
721 if (opt_skb != NULL)
722 __kfree_skb(opt_skb);
723 kfree_skb(skb);
724 return 0;
725}
726
727static int dccp_v6_rcv(struct sk_buff *skb)
728{
729 const struct dccp_hdr *dh;
730 struct sock *sk;
731 int min_cov;
732
733
734
735 if (dccp_invalid_packet(skb))
736 goto discard_it;
737
738
739 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
740 &ipv6_hdr(skb)->daddr)) {
741 DCCP_WARN("dropped packet with invalid checksum\n");
742 goto discard_it;
743 }
744
745 dh = dccp_hdr(skb);
746
747 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
748 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
749
750 if (dccp_packet_without_ack(skb))
751 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
752 else
753 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
754
755
756
757 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
758 dh->dccph_sport, dh->dccph_dport);
759
760
761
762
763 if (sk == NULL) {
764 dccp_pr_debug("failed to look up flow ID in table and "
765 "get corresponding socket\n");
766 goto no_dccp_socket;
767 }
768
769
770
771
772
773
774
775 if (sk->sk_state == DCCP_TIME_WAIT) {
776 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
777 inet_twsk_put(inet_twsk(sk));
778 goto no_dccp_socket;
779 }
780
781
782
783
784
785
786 min_cov = dccp_sk(sk)->dccps_pcrlen;
787 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
788 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
789 dh->dccph_cscov, min_cov);
790
791 goto discard_and_relse;
792 }
793
794 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
795 goto discard_and_relse;
796
797 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
798
799no_dccp_socket:
800 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
801 goto discard_it;
802
803
804
805
806
807
808 if (dh->dccph_type != DCCP_PKT_RESET) {
809 DCCP_SKB_CB(skb)->dccpd_reset_code =
810 DCCP_RESET_CODE_NO_CONNECTION;
811 dccp_v6_ctl_send_reset(sk, skb);
812 }
813
814discard_it:
815 kfree_skb(skb);
816 return 0;
817
818discard_and_relse:
819 sock_put(sk);
820 goto discard_it;
821}
822
823static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
824 int addr_len)
825{
826 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
827 struct inet_connection_sock *icsk = inet_csk(sk);
828 struct inet_sock *inet = inet_sk(sk);
829 struct ipv6_pinfo *np = inet6_sk(sk);
830 struct dccp_sock *dp = dccp_sk(sk);
831 struct in6_addr *saddr = NULL, *final_p, final;
832 struct flowi6 fl6;
833 struct dst_entry *dst;
834 int addr_type;
835 int err;
836
837 dp->dccps_role = DCCP_ROLE_CLIENT;
838
839 if (addr_len < SIN6_LEN_RFC2133)
840 return -EINVAL;
841
842 if (usin->sin6_family != AF_INET6)
843 return -EAFNOSUPPORT;
844
845 memset(&fl6, 0, sizeof(fl6));
846
847 if (np->sndflow) {
848 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
849 IP6_ECN_flow_init(fl6.flowlabel);
850 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
851 struct ip6_flowlabel *flowlabel;
852 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
853 if (flowlabel == NULL)
854 return -EINVAL;
855 usin->sin6_addr = flowlabel->dst;
856 fl6_sock_release(flowlabel);
857 }
858 }
859
860
861
862 if (ipv6_addr_any(&usin->sin6_addr))
863 usin->sin6_addr.s6_addr[15] = 1;
864
865 addr_type = ipv6_addr_type(&usin->sin6_addr);
866
867 if (addr_type & IPV6_ADDR_MULTICAST)
868 return -ENETUNREACH;
869
870 if (addr_type & IPV6_ADDR_LINKLOCAL) {
871 if (addr_len >= sizeof(struct sockaddr_in6) &&
872 usin->sin6_scope_id) {
873
874
875
876 if (sk->sk_bound_dev_if &&
877 sk->sk_bound_dev_if != usin->sin6_scope_id)
878 return -EINVAL;
879
880 sk->sk_bound_dev_if = usin->sin6_scope_id;
881 }
882
883
884 if (!sk->sk_bound_dev_if)
885 return -EINVAL;
886 }
887
888 np->daddr = usin->sin6_addr;
889 np->flow_label = fl6.flowlabel;
890
891
892
893
894 if (addr_type == IPV6_ADDR_MAPPED) {
895 u32 exthdrlen = icsk->icsk_ext_hdr_len;
896 struct sockaddr_in sin;
897
898 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
899
900 if (__ipv6_only_sock(sk))
901 return -ENETUNREACH;
902
903 sin.sin_family = AF_INET;
904 sin.sin_port = usin->sin6_port;
905 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
906
907 icsk->icsk_af_ops = &dccp_ipv6_mapped;
908 sk->sk_backlog_rcv = dccp_v4_do_rcv;
909
910 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
911 if (err) {
912 icsk->icsk_ext_hdr_len = exthdrlen;
913 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
914 sk->sk_backlog_rcv = dccp_v6_do_rcv;
915 goto failure;
916 }
917 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
918 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
919
920 return err;
921 }
922
923 if (!ipv6_addr_any(&np->rcv_saddr))
924 saddr = &np->rcv_saddr;
925
926 fl6.flowi6_proto = IPPROTO_DCCP;
927 fl6.daddr = np->daddr;
928 fl6.saddr = saddr ? *saddr : np->saddr;
929 fl6.flowi6_oif = sk->sk_bound_dev_if;
930 fl6.fl6_dport = usin->sin6_port;
931 fl6.fl6_sport = inet->inet_sport;
932 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
933
934 final_p = fl6_update_dst(&fl6, np->opt, &final);
935
936 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
937 if (IS_ERR(dst)) {
938 err = PTR_ERR(dst);
939 goto failure;
940 }
941
942 if (saddr == NULL) {
943 saddr = &fl6.saddr;
944 np->rcv_saddr = *saddr;
945 }
946
947
948 np->saddr = *saddr;
949 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
950
951 __ip6_dst_store(sk, dst, NULL, NULL);
952
953 icsk->icsk_ext_hdr_len = 0;
954 if (np->opt != NULL)
955 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
956 np->opt->opt_nflen);
957
958 inet->inet_dport = usin->sin6_port;
959
960 dccp_set_state(sk, DCCP_REQUESTING);
961 err = inet6_hash_connect(&dccp_death_row, sk);
962 if (err)
963 goto late_failure;
964
965 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
966 np->daddr.s6_addr32,
967 inet->inet_sport,
968 inet->inet_dport);
969 err = dccp_connect(sk);
970 if (err)
971 goto late_failure;
972
973 return 0;
974
975late_failure:
976 dccp_set_state(sk, DCCP_CLOSED);
977 __sk_dst_reset(sk);
978failure:
979 inet->inet_dport = 0;
980 sk->sk_route_caps = 0;
981 return err;
982}
983
984static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
985 .queue_xmit = inet6_csk_xmit,
986 .send_check = dccp_v6_send_check,
987 .rebuild_header = inet6_sk_rebuild_header,
988 .conn_request = dccp_v6_conn_request,
989 .syn_recv_sock = dccp_v6_request_recv_sock,
990 .net_header_len = sizeof(struct ipv6hdr),
991 .setsockopt = ipv6_setsockopt,
992 .getsockopt = ipv6_getsockopt,
993 .addr2sockaddr = inet6_csk_addr2sockaddr,
994 .sockaddr_len = sizeof(struct sockaddr_in6),
995 .bind_conflict = inet6_csk_bind_conflict,
996#ifdef CONFIG_COMPAT
997 .compat_setsockopt = compat_ipv6_setsockopt,
998 .compat_getsockopt = compat_ipv6_getsockopt,
999#endif
1000};
1001
1002
1003
1004
1005static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1006 .queue_xmit = ip_queue_xmit,
1007 .send_check = dccp_v4_send_check,
1008 .rebuild_header = inet_sk_rebuild_header,
1009 .conn_request = dccp_v6_conn_request,
1010 .syn_recv_sock = dccp_v6_request_recv_sock,
1011 .net_header_len = sizeof(struct iphdr),
1012 .setsockopt = ipv6_setsockopt,
1013 .getsockopt = ipv6_getsockopt,
1014 .addr2sockaddr = inet6_csk_addr2sockaddr,
1015 .sockaddr_len = sizeof(struct sockaddr_in6),
1016#ifdef CONFIG_COMPAT
1017 .compat_setsockopt = compat_ipv6_setsockopt,
1018 .compat_getsockopt = compat_ipv6_getsockopt,
1019#endif
1020};
1021
1022
1023
1024
1025static int dccp_v6_init_sock(struct sock *sk)
1026{
1027 static __u8 dccp_v6_ctl_sock_initialized;
1028 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1029
1030 if (err == 0) {
1031 if (unlikely(!dccp_v6_ctl_sock_initialized))
1032 dccp_v6_ctl_sock_initialized = 1;
1033 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1034 }
1035
1036 return err;
1037}
1038
1039static void dccp_v6_destroy_sock(struct sock *sk)
1040{
1041 dccp_destroy_sock(sk);
1042 inet6_destroy_sock(sk);
1043}
1044
1045static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1046 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1047};
1048
1049static struct proto dccp_v6_prot = {
1050 .name = "DCCPv6",
1051 .owner = THIS_MODULE,
1052 .close = dccp_close,
1053 .connect = dccp_v6_connect,
1054 .disconnect = dccp_disconnect,
1055 .ioctl = dccp_ioctl,
1056 .init = dccp_v6_init_sock,
1057 .setsockopt = dccp_setsockopt,
1058 .getsockopt = dccp_getsockopt,
1059 .sendmsg = dccp_sendmsg,
1060 .recvmsg = dccp_recvmsg,
1061 .backlog_rcv = dccp_v6_do_rcv,
1062 .hash = dccp_v6_hash,
1063 .unhash = inet_unhash,
1064 .accept = inet_csk_accept,
1065 .get_port = inet_csk_get_port,
1066 .shutdown = dccp_shutdown,
1067 .destroy = dccp_v6_destroy_sock,
1068 .orphan_count = &dccp_orphan_count,
1069 .max_header = MAX_DCCP_HEADER,
1070 .obj_size = sizeof(struct dccp6_sock),
1071 .slab_flags = SLAB_DESTROY_BY_RCU,
1072 .rsk_prot = &dccp6_request_sock_ops,
1073 .twsk_prot = &dccp6_timewait_sock_ops,
1074 .h.hashinfo = &dccp_hashinfo,
1075#ifdef CONFIG_COMPAT
1076 .compat_setsockopt = compat_dccp_setsockopt,
1077 .compat_getsockopt = compat_dccp_getsockopt,
1078#endif
1079};
1080
1081static const struct inet6_protocol dccp_v6_protocol = {
1082 .handler = dccp_v6_rcv,
1083 .err_handler = dccp_v6_err,
1084 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1085};
1086
1087static const struct proto_ops inet6_dccp_ops = {
1088 .family = PF_INET6,
1089 .owner = THIS_MODULE,
1090 .release = inet6_release,
1091 .bind = inet6_bind,
1092 .connect = inet_stream_connect,
1093 .socketpair = sock_no_socketpair,
1094 .accept = inet_accept,
1095 .getname = inet6_getname,
1096 .poll = dccp_poll,
1097 .ioctl = inet6_ioctl,
1098 .listen = inet_dccp_listen,
1099 .shutdown = inet_shutdown,
1100 .setsockopt = sock_common_setsockopt,
1101 .getsockopt = sock_common_getsockopt,
1102 .sendmsg = inet_sendmsg,
1103 .recvmsg = sock_common_recvmsg,
1104 .mmap = sock_no_mmap,
1105 .sendpage = sock_no_sendpage,
1106#ifdef CONFIG_COMPAT
1107 .compat_setsockopt = compat_sock_common_setsockopt,
1108 .compat_getsockopt = compat_sock_common_getsockopt,
1109#endif
1110};
1111
1112static struct inet_protosw dccp_v6_protosw = {
1113 .type = SOCK_DCCP,
1114 .protocol = IPPROTO_DCCP,
1115 .prot = &dccp_v6_prot,
1116 .ops = &inet6_dccp_ops,
1117 .flags = INET_PROTOSW_ICSK,
1118};
1119
1120static int __net_init dccp_v6_init_net(struct net *net)
1121{
1122 if (dccp_hashinfo.bhash == NULL)
1123 return -ESOCKTNOSUPPORT;
1124
1125 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1126 SOCK_DCCP, IPPROTO_DCCP, net);
1127}
1128
1129static void __net_exit dccp_v6_exit_net(struct net *net)
1130{
1131 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1132}
1133
1134static struct pernet_operations dccp_v6_ops = {
1135 .init = dccp_v6_init_net,
1136 .exit = dccp_v6_exit_net,
1137};
1138
1139static int __init dccp_v6_init(void)
1140{
1141 int err = proto_register(&dccp_v6_prot, 1);
1142
1143 if (err != 0)
1144 goto out;
1145
1146 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1147 if (err != 0)
1148 goto out_unregister_proto;
1149
1150 inet6_register_protosw(&dccp_v6_protosw);
1151
1152 err = register_pernet_subsys(&dccp_v6_ops);
1153 if (err != 0)
1154 goto out_destroy_ctl_sock;
1155out:
1156 return err;
1157
1158out_destroy_ctl_sock:
1159 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1160 inet6_unregister_protosw(&dccp_v6_protosw);
1161out_unregister_proto:
1162 proto_unregister(&dccp_v6_prot);
1163 goto out;
1164}
1165
1166static void __exit dccp_v6_exit(void)
1167{
1168 unregister_pernet_subsys(&dccp_v6_ops);
1169 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1170 inet6_unregister_protosw(&dccp_v6_protosw);
1171 proto_unregister(&dccp_v6_prot);
1172}
1173
1174module_init(dccp_v6_init);
1175module_exit(dccp_v6_exit);
1176
1177
1178
1179
1180
1181
1182MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1183MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1184MODULE_LICENSE("GPL");
1185MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1186MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
1187