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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 == ICMPV6_PKT_TOOBIG) {
134 struct dst_entry *dst = NULL;
135
136 if (sock_owned_by_user(sk))
137 goto out;
138 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
139 goto out;
140
141
142 dst = __sk_dst_check(sk, np->dst_cookie);
143 if (dst == NULL) {
144 struct inet_sock *inet = inet_sk(sk);
145 struct flowi6 fl6;
146
147
148
149
150
151 memset(&fl6, 0, sizeof(fl6));
152 fl6.flowi6_proto = IPPROTO_DCCP;
153 fl6.daddr = np->daddr;
154 fl6.saddr = np->saddr;
155 fl6.flowi6_oif = sk->sk_bound_dev_if;
156 fl6.fl6_dport = inet->inet_dport;
157 fl6.fl6_sport = inet->inet_sport;
158 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
159
160 dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
161 if (IS_ERR(dst)) {
162 sk->sk_err_soft = -PTR_ERR(dst);
163 goto out;
164 }
165 } else
166 dst_hold(dst);
167
168 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
169 dccp_sync_mss(sk, dst_mtu(dst));
170 }
171 dst_release(dst);
172 goto out;
173 }
174
175 icmpv6_err_convert(type, code, &err);
176
177
178 switch (sk->sk_state) {
179 struct request_sock *req, **prev;
180 case DCCP_LISTEN:
181 if (sock_owned_by_user(sk))
182 goto out;
183
184 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
185 &hdr->daddr, &hdr->saddr,
186 inet6_iif(skb));
187 if (req == NULL)
188 goto out;
189
190
191
192
193
194 WARN_ON(req->sk != NULL);
195
196 if (!between48(seq, dccp_rsk(req)->dreq_iss,
197 dccp_rsk(req)->dreq_gss)) {
198 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
199 goto out;
200 }
201
202 inet_csk_reqsk_queue_drop(sk, req, prev);
203 goto out;
204
205 case DCCP_REQUESTING:
206 case DCCP_RESPOND:
207
208 if (!sock_owned_by_user(sk)) {
209 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
210 sk->sk_err = err;
211
212
213
214
215 sk->sk_error_report(sk);
216 dccp_done(sk);
217 } else
218 sk->sk_err_soft = err;
219 goto out;
220 }
221
222 if (!sock_owned_by_user(sk) && np->recverr) {
223 sk->sk_err = err;
224 sk->sk_error_report(sk);
225 } else
226 sk->sk_err_soft = err;
227
228out:
229 bh_unlock_sock(sk);
230 sock_put(sk);
231}
232
233
234static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
235 struct request_values *rv_unused)
236{
237 struct inet6_request_sock *ireq6 = inet6_rsk(req);
238 struct ipv6_pinfo *np = inet6_sk(sk);
239 struct sk_buff *skb;
240 struct ipv6_txoptions *opt = NULL;
241 struct in6_addr *final_p, final;
242 struct flowi6 fl6;
243 int err = -1;
244 struct dst_entry *dst;
245
246 memset(&fl6, 0, sizeof(fl6));
247 fl6.flowi6_proto = IPPROTO_DCCP;
248 fl6.daddr = ireq6->rmt_addr;
249 fl6.saddr = ireq6->loc_addr;
250 fl6.flowlabel = 0;
251 fl6.flowi6_oif = ireq6->iif;
252 fl6.fl6_dport = inet_rsk(req)->rmt_port;
253 fl6.fl6_sport = inet_rsk(req)->loc_port;
254 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
255
256 opt = np->opt;
257
258 final_p = fl6_update_dst(&fl6, opt, &final);
259
260 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
261 if (IS_ERR(dst)) {
262 err = PTR_ERR(dst);
263 dst = NULL;
264 goto done;
265 }
266
267 skb = dccp_make_response(sk, dst, req);
268 if (skb != NULL) {
269 struct dccp_hdr *dh = dccp_hdr(skb);
270
271 dh->dccph_checksum = dccp_v6_csum_finish(skb,
272 &ireq6->loc_addr,
273 &ireq6->rmt_addr);
274 fl6.daddr = ireq6->rmt_addr;
275 err = ip6_xmit(sk, skb, &fl6, opt, np->tclass);
276 err = net_xmit_eval(err);
277 }
278
279done:
280 if (opt != NULL && opt != np->opt)
281 sock_kfree_s(sk, opt, opt->tot_len);
282 dst_release(dst);
283 return err;
284}
285
286static void dccp_v6_reqsk_destructor(struct request_sock *req)
287{
288 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
289 if (inet6_rsk(req)->pktopts != NULL)
290 kfree_skb(inet6_rsk(req)->pktopts);
291}
292
293static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
294{
295 const struct ipv6hdr *rxip6h;
296 struct sk_buff *skb;
297 struct flowi6 fl6;
298 struct net *net = dev_net(skb_dst(rxskb)->dev);
299 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
300 struct dst_entry *dst;
301
302 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
303 return;
304
305 if (!ipv6_unicast_destination(rxskb))
306 return;
307
308 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
309 if (skb == NULL)
310 return;
311
312 rxip6h = ipv6_hdr(rxskb);
313 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
314 &rxip6h->daddr);
315
316 memset(&fl6, 0, sizeof(fl6));
317 fl6.daddr = rxip6h->saddr;
318 fl6.saddr = rxip6h->daddr;
319
320 fl6.flowi6_proto = IPPROTO_DCCP;
321 fl6.flowi6_oif = inet6_iif(rxskb);
322 fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
323 fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
324 security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
325
326
327 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
328 if (!IS_ERR(dst)) {
329 skb_dst_set(skb, dst);
330 ip6_xmit(ctl_sk, skb, &fl6, NULL, 0);
331 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
332 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
333 return;
334 }
335
336 kfree_skb(skb);
337}
338
339static struct request_sock_ops dccp6_request_sock_ops = {
340 .family = AF_INET6,
341 .obj_size = sizeof(struct dccp6_request_sock),
342 .rtx_syn_ack = dccp_v6_send_response,
343 .send_ack = dccp_reqsk_send_ack,
344 .destructor = dccp_v6_reqsk_destructor,
345 .send_reset = dccp_v6_ctl_send_reset,
346};
347
348static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
349{
350 const struct dccp_hdr *dh = dccp_hdr(skb);
351 const struct ipv6hdr *iph = ipv6_hdr(skb);
352 struct sock *nsk;
353 struct request_sock **prev;
354
355 struct request_sock *req = inet6_csk_search_req(sk, &prev,
356 dh->dccph_sport,
357 &iph->saddr,
358 &iph->daddr,
359 inet6_iif(skb));
360 if (req != NULL)
361 return dccp_check_req(sk, skb, req, prev);
362
363 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
364 &iph->saddr, dh->dccph_sport,
365 &iph->daddr, ntohs(dh->dccph_dport),
366 inet6_iif(skb));
367 if (nsk != NULL) {
368 if (nsk->sk_state != DCCP_TIME_WAIT) {
369 bh_lock_sock(nsk);
370 return nsk;
371 }
372 inet_twsk_put(inet_twsk(nsk));
373 return NULL;
374 }
375
376 return sk;
377}
378
379static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
380{
381 struct request_sock *req;
382 struct dccp_request_sock *dreq;
383 struct inet6_request_sock *ireq6;
384 struct ipv6_pinfo *np = inet6_sk(sk);
385 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
386 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
387
388 if (skb->protocol == htons(ETH_P_IP))
389 return dccp_v4_conn_request(sk, skb);
390
391 if (!ipv6_unicast_destination(skb))
392 return 0;
393
394 if (dccp_bad_service_code(sk, service)) {
395 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
396 goto drop;
397 }
398
399
400
401 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
402 if (inet_csk_reqsk_queue_is_full(sk))
403 goto drop;
404
405 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
406 goto drop;
407
408 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
409 if (req == NULL)
410 goto drop;
411
412 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
413 goto drop_and_free;
414
415 dreq = dccp_rsk(req);
416 if (dccp_parse_options(sk, dreq, skb))
417 goto drop_and_free;
418
419 if (security_inet_conn_request(sk, skb, req))
420 goto drop_and_free;
421
422 ireq6 = inet6_rsk(req);
423 ireq6->rmt_addr = ipv6_hdr(skb)->saddr;
424 ireq6->loc_addr = ipv6_hdr(skb)->daddr;
425
426 if (ipv6_opt_accepted(sk, skb) ||
427 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
428 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
429 atomic_inc(&skb->users);
430 ireq6->pktopts = skb;
431 }
432 ireq6->iif = sk->sk_bound_dev_if;
433
434
435 if (!sk->sk_bound_dev_if &&
436 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
437 ireq6->iif = inet6_iif(skb);
438
439
440
441
442
443
444
445
446 dreq->dreq_isr = dcb->dccpd_seq;
447 dreq->dreq_gsr = dreq->dreq_isr;
448 dreq->dreq_iss = dccp_v6_init_sequence(skb);
449 dreq->dreq_gss = dreq->dreq_iss;
450 dreq->dreq_service = service;
451
452 if (dccp_v6_send_response(sk, req, NULL))
453 goto drop_and_free;
454
455 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
456 return 0;
457
458drop_and_free:
459 reqsk_free(req);
460drop:
461 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
462 return -1;
463}
464
465static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
466 struct sk_buff *skb,
467 struct request_sock *req,
468 struct dst_entry *dst)
469{
470 struct inet6_request_sock *ireq6 = inet6_rsk(req);
471 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
472 struct inet_sock *newinet;
473 struct dccp6_sock *newdp6;
474 struct sock *newsk;
475 struct ipv6_txoptions *opt;
476
477 if (skb->protocol == htons(ETH_P_IP)) {
478
479
480
481 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
482 if (newsk == NULL)
483 return NULL;
484
485 newdp6 = (struct dccp6_sock *)newsk;
486 newinet = inet_sk(newsk);
487 newinet->pinet6 = &newdp6->inet6;
488 newnp = inet6_sk(newsk);
489
490 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
491
492 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
493
494 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
495
496 newnp->rcv_saddr = newnp->saddr;
497
498 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
499 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
500 newnp->pktoptions = NULL;
501 newnp->opt = NULL;
502 newnp->mcast_oif = inet6_iif(skb);
503 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
504
505
506
507
508
509
510
511
512
513
514
515 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
516
517 return newsk;
518 }
519
520 opt = np->opt;
521
522 if (sk_acceptq_is_full(sk))
523 goto out_overflow;
524
525 if (dst == NULL) {
526 struct in6_addr *final_p, final;
527 struct flowi6 fl6;
528
529 memset(&fl6, 0, sizeof(fl6));
530 fl6.flowi6_proto = IPPROTO_DCCP;
531 fl6.daddr = ireq6->rmt_addr;
532 final_p = fl6_update_dst(&fl6, opt, &final);
533 fl6.saddr = ireq6->loc_addr;
534 fl6.flowi6_oif = sk->sk_bound_dev_if;
535 fl6.fl6_dport = inet_rsk(req)->rmt_port;
536 fl6.fl6_sport = inet_rsk(req)->loc_port;
537 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
538
539 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
540 if (IS_ERR(dst))
541 goto out;
542 }
543
544 newsk = dccp_create_openreq_child(sk, req, skb);
545 if (newsk == NULL)
546 goto out_nonewsk;
547
548
549
550
551
552
553
554 __ip6_dst_store(newsk, dst, NULL, NULL);
555 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
556 NETIF_F_TSO);
557 newdp6 = (struct dccp6_sock *)newsk;
558 newinet = inet_sk(newsk);
559 newinet->pinet6 = &newdp6->inet6;
560 newnp = inet6_sk(newsk);
561
562 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
563
564 newnp->daddr = ireq6->rmt_addr;
565 newnp->saddr = ireq6->loc_addr;
566 newnp->rcv_saddr = ireq6->loc_addr;
567 newsk->sk_bound_dev_if = ireq6->iif;
568
569
570
571
572
573 newinet->inet_opt = NULL;
574
575
576 newnp->rxopt.all = np->rxopt.all;
577
578
579 newnp->pktoptions = NULL;
580 if (ireq6->pktopts != NULL) {
581 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
582 kfree_skb(ireq6->pktopts);
583 ireq6->pktopts = NULL;
584 if (newnp->pktoptions)
585 skb_set_owner_r(newnp->pktoptions, newsk);
586 }
587 newnp->opt = NULL;
588 newnp->mcast_oif = inet6_iif(skb);
589 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
590
591
592
593
594
595
596
597 if (opt != NULL) {
598 newnp->opt = ipv6_dup_options(newsk, opt);
599 if (opt != np->opt)
600 sock_kfree_s(sk, opt, opt->tot_len);
601 }
602
603 inet_csk(newsk)->icsk_ext_hdr_len = 0;
604 if (newnp->opt != NULL)
605 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
606 newnp->opt->opt_flen);
607
608 dccp_sync_mss(newsk, dst_mtu(dst));
609
610 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
611 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
612
613 if (__inet_inherit_port(sk, newsk) < 0) {
614 sock_put(newsk);
615 goto out;
616 }
617 __inet6_hash(newsk, NULL);
618
619 return newsk;
620
621out_overflow:
622 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
623out_nonewsk:
624 dst_release(dst);
625out:
626 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
627 if (opt != NULL && opt != np->opt)
628 sock_kfree_s(sk, opt, opt->tot_len);
629 return NULL;
630}
631
632
633
634
635
636
637
638
639
640static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
641{
642 struct ipv6_pinfo *np = inet6_sk(sk);
643 struct sk_buff *opt_skb = NULL;
644
645
646
647
648
649
650
651
652
653 if (skb->protocol == htons(ETH_P_IP))
654 return dccp_v4_do_rcv(sk, skb);
655
656 if (sk_filter(sk, skb))
657 goto discard;
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677 if (np->rxopt.all)
678
679
680
681
682 opt_skb = skb_clone(skb, GFP_ATOMIC);
683
684 if (sk->sk_state == DCCP_OPEN) {
685 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
686 goto reset;
687 if (opt_skb) {
688
689 __kfree_skb(opt_skb);
690 }
691 return 0;
692 }
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718 if (sk->sk_state == DCCP_LISTEN) {
719 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
720
721 if (nsk == NULL)
722 goto discard;
723
724
725
726
727
728 if (nsk != sk) {
729 if (dccp_child_process(sk, nsk, skb))
730 goto reset;
731 if (opt_skb != NULL)
732 __kfree_skb(opt_skb);
733 return 0;
734 }
735 }
736
737 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
738 goto reset;
739 if (opt_skb) {
740
741 __kfree_skb(opt_skb);
742 }
743 return 0;
744
745reset:
746 dccp_v6_ctl_send_reset(sk, skb);
747discard:
748 if (opt_skb != NULL)
749 __kfree_skb(opt_skb);
750 kfree_skb(skb);
751 return 0;
752}
753
754static int dccp_v6_rcv(struct sk_buff *skb)
755{
756 const struct dccp_hdr *dh;
757 struct sock *sk;
758 int min_cov;
759
760
761
762 if (dccp_invalid_packet(skb))
763 goto discard_it;
764
765
766 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
767 &ipv6_hdr(skb)->daddr)) {
768 DCCP_WARN("dropped packet with invalid checksum\n");
769 goto discard_it;
770 }
771
772 dh = dccp_hdr(skb);
773
774 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
775 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
776
777 if (dccp_packet_without_ack(skb))
778 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
779 else
780 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
781
782
783
784 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
785 dh->dccph_sport, dh->dccph_dport);
786
787
788
789
790 if (sk == NULL) {
791 dccp_pr_debug("failed to look up flow ID in table and "
792 "get corresponding socket\n");
793 goto no_dccp_socket;
794 }
795
796
797
798
799
800
801
802 if (sk->sk_state == DCCP_TIME_WAIT) {
803 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
804 inet_twsk_put(inet_twsk(sk));
805 goto no_dccp_socket;
806 }
807
808
809
810
811
812
813 min_cov = dccp_sk(sk)->dccps_pcrlen;
814 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
815 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
816 dh->dccph_cscov, min_cov);
817
818 goto discard_and_relse;
819 }
820
821 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
822 goto discard_and_relse;
823
824 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
825
826no_dccp_socket:
827 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
828 goto discard_it;
829
830
831
832
833
834
835 if (dh->dccph_type != DCCP_PKT_RESET) {
836 DCCP_SKB_CB(skb)->dccpd_reset_code =
837 DCCP_RESET_CODE_NO_CONNECTION;
838 dccp_v6_ctl_send_reset(sk, skb);
839 }
840
841discard_it:
842 kfree_skb(skb);
843 return 0;
844
845discard_and_relse:
846 sock_put(sk);
847 goto discard_it;
848}
849
850static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
851 int addr_len)
852{
853 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
854 struct inet_connection_sock *icsk = inet_csk(sk);
855 struct inet_sock *inet = inet_sk(sk);
856 struct ipv6_pinfo *np = inet6_sk(sk);
857 struct dccp_sock *dp = dccp_sk(sk);
858 struct in6_addr *saddr = NULL, *final_p, final;
859 struct flowi6 fl6;
860 struct dst_entry *dst;
861 int addr_type;
862 int err;
863
864 dp->dccps_role = DCCP_ROLE_CLIENT;
865
866 if (addr_len < SIN6_LEN_RFC2133)
867 return -EINVAL;
868
869 if (usin->sin6_family != AF_INET6)
870 return -EAFNOSUPPORT;
871
872 memset(&fl6, 0, sizeof(fl6));
873
874 if (np->sndflow) {
875 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
876 IP6_ECN_flow_init(fl6.flowlabel);
877 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
878 struct ip6_flowlabel *flowlabel;
879 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
880 if (flowlabel == NULL)
881 return -EINVAL;
882 usin->sin6_addr = flowlabel->dst;
883 fl6_sock_release(flowlabel);
884 }
885 }
886
887
888
889 if (ipv6_addr_any(&usin->sin6_addr))
890 usin->sin6_addr.s6_addr[15] = 1;
891
892 addr_type = ipv6_addr_type(&usin->sin6_addr);
893
894 if (addr_type & IPV6_ADDR_MULTICAST)
895 return -ENETUNREACH;
896
897 if (addr_type & IPV6_ADDR_LINKLOCAL) {
898 if (addr_len >= sizeof(struct sockaddr_in6) &&
899 usin->sin6_scope_id) {
900
901
902
903 if (sk->sk_bound_dev_if &&
904 sk->sk_bound_dev_if != usin->sin6_scope_id)
905 return -EINVAL;
906
907 sk->sk_bound_dev_if = usin->sin6_scope_id;
908 }
909
910
911 if (!sk->sk_bound_dev_if)
912 return -EINVAL;
913 }
914
915 np->daddr = usin->sin6_addr;
916 np->flow_label = fl6.flowlabel;
917
918
919
920
921 if (addr_type == IPV6_ADDR_MAPPED) {
922 u32 exthdrlen = icsk->icsk_ext_hdr_len;
923 struct sockaddr_in sin;
924
925 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
926
927 if (__ipv6_only_sock(sk))
928 return -ENETUNREACH;
929
930 sin.sin_family = AF_INET;
931 sin.sin_port = usin->sin6_port;
932 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
933
934 icsk->icsk_af_ops = &dccp_ipv6_mapped;
935 sk->sk_backlog_rcv = dccp_v4_do_rcv;
936
937 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
938 if (err) {
939 icsk->icsk_ext_hdr_len = exthdrlen;
940 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
941 sk->sk_backlog_rcv = dccp_v6_do_rcv;
942 goto failure;
943 }
944 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
945 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
946
947 return err;
948 }
949
950 if (!ipv6_addr_any(&np->rcv_saddr))
951 saddr = &np->rcv_saddr;
952
953 fl6.flowi6_proto = IPPROTO_DCCP;
954 fl6.daddr = np->daddr;
955 fl6.saddr = saddr ? *saddr : np->saddr;
956 fl6.flowi6_oif = sk->sk_bound_dev_if;
957 fl6.fl6_dport = usin->sin6_port;
958 fl6.fl6_sport = inet->inet_sport;
959 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
960
961 final_p = fl6_update_dst(&fl6, np->opt, &final);
962
963 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
964 if (IS_ERR(dst)) {
965 err = PTR_ERR(dst);
966 goto failure;
967 }
968
969 if (saddr == NULL) {
970 saddr = &fl6.saddr;
971 np->rcv_saddr = *saddr;
972 }
973
974
975 np->saddr = *saddr;
976 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
977
978 __ip6_dst_store(sk, dst, NULL, NULL);
979
980 icsk->icsk_ext_hdr_len = 0;
981 if (np->opt != NULL)
982 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
983 np->opt->opt_nflen);
984
985 inet->inet_dport = usin->sin6_port;
986
987 dccp_set_state(sk, DCCP_REQUESTING);
988 err = inet6_hash_connect(&dccp_death_row, sk);
989 if (err)
990 goto late_failure;
991
992 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
993 np->daddr.s6_addr32,
994 inet->inet_sport,
995 inet->inet_dport);
996 err = dccp_connect(sk);
997 if (err)
998 goto late_failure;
999
1000 return 0;
1001
1002late_failure:
1003 dccp_set_state(sk, DCCP_CLOSED);
1004 __sk_dst_reset(sk);
1005failure:
1006 inet->inet_dport = 0;
1007 sk->sk_route_caps = 0;
1008 return err;
1009}
1010
1011static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1012 .queue_xmit = inet6_csk_xmit,
1013 .send_check = dccp_v6_send_check,
1014 .rebuild_header = inet6_sk_rebuild_header,
1015 .conn_request = dccp_v6_conn_request,
1016 .syn_recv_sock = dccp_v6_request_recv_sock,
1017 .net_header_len = sizeof(struct ipv6hdr),
1018 .setsockopt = ipv6_setsockopt,
1019 .getsockopt = ipv6_getsockopt,
1020 .addr2sockaddr = inet6_csk_addr2sockaddr,
1021 .sockaddr_len = sizeof(struct sockaddr_in6),
1022 .bind_conflict = inet6_csk_bind_conflict,
1023#ifdef CONFIG_COMPAT
1024 .compat_setsockopt = compat_ipv6_setsockopt,
1025 .compat_getsockopt = compat_ipv6_getsockopt,
1026#endif
1027};
1028
1029
1030
1031
1032static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1033 .queue_xmit = ip_queue_xmit,
1034 .send_check = dccp_v4_send_check,
1035 .rebuild_header = inet_sk_rebuild_header,
1036 .conn_request = dccp_v6_conn_request,
1037 .syn_recv_sock = dccp_v6_request_recv_sock,
1038 .net_header_len = sizeof(struct iphdr),
1039 .setsockopt = ipv6_setsockopt,
1040 .getsockopt = ipv6_getsockopt,
1041 .addr2sockaddr = inet6_csk_addr2sockaddr,
1042 .sockaddr_len = sizeof(struct sockaddr_in6),
1043#ifdef CONFIG_COMPAT
1044 .compat_setsockopt = compat_ipv6_setsockopt,
1045 .compat_getsockopt = compat_ipv6_getsockopt,
1046#endif
1047};
1048
1049
1050
1051
1052static int dccp_v6_init_sock(struct sock *sk)
1053{
1054 static __u8 dccp_v6_ctl_sock_initialized;
1055 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1056
1057 if (err == 0) {
1058 if (unlikely(!dccp_v6_ctl_sock_initialized))
1059 dccp_v6_ctl_sock_initialized = 1;
1060 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1061 }
1062
1063 return err;
1064}
1065
1066static void dccp_v6_destroy_sock(struct sock *sk)
1067{
1068 dccp_destroy_sock(sk);
1069 inet6_destroy_sock(sk);
1070}
1071
1072static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1073 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1074};
1075
1076static struct proto dccp_v6_prot = {
1077 .name = "DCCPv6",
1078 .owner = THIS_MODULE,
1079 .close = dccp_close,
1080 .connect = dccp_v6_connect,
1081 .disconnect = dccp_disconnect,
1082 .ioctl = dccp_ioctl,
1083 .init = dccp_v6_init_sock,
1084 .setsockopt = dccp_setsockopt,
1085 .getsockopt = dccp_getsockopt,
1086 .sendmsg = dccp_sendmsg,
1087 .recvmsg = dccp_recvmsg,
1088 .backlog_rcv = dccp_v6_do_rcv,
1089 .hash = dccp_v6_hash,
1090 .unhash = inet_unhash,
1091 .accept = inet_csk_accept,
1092 .get_port = inet_csk_get_port,
1093 .shutdown = dccp_shutdown,
1094 .destroy = dccp_v6_destroy_sock,
1095 .orphan_count = &dccp_orphan_count,
1096 .max_header = MAX_DCCP_HEADER,
1097 .obj_size = sizeof(struct dccp6_sock),
1098 .slab_flags = SLAB_DESTROY_BY_RCU,
1099 .rsk_prot = &dccp6_request_sock_ops,
1100 .twsk_prot = &dccp6_timewait_sock_ops,
1101 .h.hashinfo = &dccp_hashinfo,
1102#ifdef CONFIG_COMPAT
1103 .compat_setsockopt = compat_dccp_setsockopt,
1104 .compat_getsockopt = compat_dccp_getsockopt,
1105#endif
1106};
1107
1108static const struct inet6_protocol dccp_v6_protocol = {
1109 .handler = dccp_v6_rcv,
1110 .err_handler = dccp_v6_err,
1111 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1112};
1113
1114static const struct proto_ops inet6_dccp_ops = {
1115 .family = PF_INET6,
1116 .owner = THIS_MODULE,
1117 .release = inet6_release,
1118 .bind = inet6_bind,
1119 .connect = inet_stream_connect,
1120 .socketpair = sock_no_socketpair,
1121 .accept = inet_accept,
1122 .getname = inet6_getname,
1123 .poll = dccp_poll,
1124 .ioctl = inet6_ioctl,
1125 .listen = inet_dccp_listen,
1126 .shutdown = inet_shutdown,
1127 .setsockopt = sock_common_setsockopt,
1128 .getsockopt = sock_common_getsockopt,
1129 .sendmsg = inet_sendmsg,
1130 .recvmsg = sock_common_recvmsg,
1131 .mmap = sock_no_mmap,
1132 .sendpage = sock_no_sendpage,
1133#ifdef CONFIG_COMPAT
1134 .compat_setsockopt = compat_sock_common_setsockopt,
1135 .compat_getsockopt = compat_sock_common_getsockopt,
1136#endif
1137};
1138
1139static struct inet_protosw dccp_v6_protosw = {
1140 .type = SOCK_DCCP,
1141 .protocol = IPPROTO_DCCP,
1142 .prot = &dccp_v6_prot,
1143 .ops = &inet6_dccp_ops,
1144 .flags = INET_PROTOSW_ICSK,
1145};
1146
1147static int __net_init dccp_v6_init_net(struct net *net)
1148{
1149 if (dccp_hashinfo.bhash == NULL)
1150 return -ESOCKTNOSUPPORT;
1151
1152 return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1153 SOCK_DCCP, IPPROTO_DCCP, net);
1154}
1155
1156static void __net_exit dccp_v6_exit_net(struct net *net)
1157{
1158 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1159}
1160
1161static struct pernet_operations dccp_v6_ops = {
1162 .init = dccp_v6_init_net,
1163 .exit = dccp_v6_exit_net,
1164};
1165
1166static int __init dccp_v6_init(void)
1167{
1168 int err = proto_register(&dccp_v6_prot, 1);
1169
1170 if (err != 0)
1171 goto out;
1172
1173 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1174 if (err != 0)
1175 goto out_unregister_proto;
1176
1177 inet6_register_protosw(&dccp_v6_protosw);
1178
1179 err = register_pernet_subsys(&dccp_v6_ops);
1180 if (err != 0)
1181 goto out_destroy_ctl_sock;
1182out:
1183 return err;
1184
1185out_destroy_ctl_sock:
1186 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1187 inet6_unregister_protosw(&dccp_v6_protosw);
1188out_unregister_proto:
1189 proto_unregister(&dccp_v6_prot);
1190 goto out;
1191}
1192
1193static void __exit dccp_v6_exit(void)
1194{
1195 unregister_pernet_subsys(&dccp_v6_ops);
1196 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1197 inet6_unregister_protosw(&dccp_v6_protosw);
1198 proto_unregister(&dccp_v6_prot);
1199}
1200
1201module_init(dccp_v6_init);
1202module_exit(dccp_v6_exit);
1203
1204
1205
1206
1207
1208
1209MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1210MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1211MODULE_LICENSE("GPL");
1212MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1213MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
1214