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