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15#include <linux/module.h>
16#include <linux/random.h>
17#include <linux/xfrm.h>
18
19#include <net/addrconf.h>
20#include <net/inet_common.h>
21#include <net/inet_hashtables.h>
22#include <net/inet_sock.h>
23#include <net/inet6_connection_sock.h>
24#include <net/inet6_hashtables.h>
25#include <net/ip6_route.h>
26#include <net/ipv6.h>
27#include <net/protocol.h>
28#include <net/transp_v6.h>
29#include <net/ip6_checksum.h>
30#include <net/xfrm.h>
31
32#include "dccp.h"
33#include "ipv6.h"
34#include "feat.h"
35
36
37static struct socket *dccp_v6_ctl_socket;
38
39static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
40static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
41
42static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
43{
44 return inet_csk_get_port(&dccp_hashinfo, sk, snum,
45 inet6_csk_bind_conflict);
46}
47
48static void dccp_v6_hash(struct sock *sk)
49{
50 if (sk->sk_state != DCCP_CLOSED) {
51 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
52 dccp_hash(sk);
53 return;
54 }
55 local_bh_disable();
56 __inet6_hash(&dccp_hashinfo, sk);
57 local_bh_enable();
58 }
59}
60
61
62static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
63 struct in6_addr *saddr,
64 struct in6_addr *daddr)
65{
66 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
67}
68
69static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
70 struct sk_buff *skb)
71{
72 struct ipv6_pinfo *np = inet6_sk(sk);
73 struct dccp_hdr *dh = dccp_hdr(skb);
74
75 dccp_csum_outgoing(skb);
76 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
77}
78
79static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
80 __be16 sport, __be16 dport )
81{
82 return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
83}
84
85static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
86{
87 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
88 ipv6_hdr(skb)->saddr.s6_addr32,
89 dccp_hdr(skb)->dccph_dport,
90 dccp_hdr(skb)->dccph_sport );
91
92}
93
94static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
95 int type, int code, int offset, __be32 info)
96{
97 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
98 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
99 struct ipv6_pinfo *np;
100 struct sock *sk;
101 int err;
102 __u64 seq;
103
104 sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
105 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
106
107 if (sk == NULL) {
108 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
109 return;
110 }
111
112 if (sk->sk_state == DCCP_TIME_WAIT) {
113 inet_twsk_put(inet_twsk(sk));
114 return;
115 }
116
117 bh_lock_sock(sk);
118 if (sock_owned_by_user(sk))
119 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
120
121 if (sk->sk_state == DCCP_CLOSED)
122 goto out;
123
124 np = inet6_sk(sk);
125
126 if (type == ICMPV6_PKT_TOOBIG) {
127 struct dst_entry *dst = NULL;
128
129 if (sock_owned_by_user(sk))
130 goto out;
131 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
132 goto out;
133
134
135 dst = __sk_dst_check(sk, np->dst_cookie);
136 if (dst == NULL) {
137 struct inet_sock *inet = inet_sk(sk);
138 struct flowi fl;
139
140
141
142
143
144 memset(&fl, 0, sizeof(fl));
145 fl.proto = IPPROTO_DCCP;
146 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
147 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
148 fl.oif = sk->sk_bound_dev_if;
149 fl.fl_ip_dport = inet->dport;
150 fl.fl_ip_sport = inet->sport;
151 security_sk_classify_flow(sk, &fl);
152
153 err = ip6_dst_lookup(sk, &dst, &fl);
154 if (err) {
155 sk->sk_err_soft = -err;
156 goto out;
157 }
158
159 err = xfrm_lookup(&dst, &fl, sk, 0);
160 if (err < 0) {
161 sk->sk_err_soft = -err;
162 goto out;
163 }
164 } else
165 dst_hold(dst);
166
167 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
168 dccp_sync_mss(sk, dst_mtu(dst));
169 }
170 dst_release(dst);
171 goto out;
172 }
173
174 icmpv6_err_convert(type, code, &err);
175
176 seq = dccp_hdr_seq(dh);
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 BUG_TRAP(req->sk == NULL);
195
196 if (seq != dccp_rsk(req)->dreq_iss) {
197 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
198 goto out;
199 }
200
201 inet_csk_reqsk_queue_drop(sk, req, prev);
202 goto out;
203
204 case DCCP_REQUESTING:
205 case DCCP_RESPOND:
206
207 if (!sock_owned_by_user(sk)) {
208 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
209 sk->sk_err = err;
210
211
212
213
214 sk->sk_error_report(sk);
215 dccp_done(sk);
216 } else
217 sk->sk_err_soft = err;
218 goto out;
219 }
220
221 if (!sock_owned_by_user(sk) && np->recverr) {
222 sk->sk_err = err;
223 sk->sk_error_report(sk);
224 } else
225 sk->sk_err_soft = err;
226
227out:
228 bh_unlock_sock(sk);
229 sock_put(sk);
230}
231
232
233static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
234 struct dst_entry *dst)
235{
236 struct inet6_request_sock *ireq6 = inet6_rsk(req);
237 struct ipv6_pinfo *np = inet6_sk(sk);
238 struct sk_buff *skb;
239 struct ipv6_txoptions *opt = NULL;
240 struct in6_addr *final_p = NULL, final;
241 struct flowi fl;
242 int err = -1;
243
244 memset(&fl, 0, sizeof(fl));
245 fl.proto = IPPROTO_DCCP;
246 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
247 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
248 fl.fl6_flowlabel = 0;
249 fl.oif = ireq6->iif;
250 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
251 fl.fl_ip_sport = inet_sk(sk)->sport;
252 security_req_classify_flow(req, &fl);
253
254 if (dst == NULL) {
255 opt = np->opt;
256
257 if (opt != NULL && opt->srcrt != NULL) {
258 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
259
260 ipv6_addr_copy(&final, &fl.fl6_dst);
261 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
262 final_p = &final;
263 }
264
265 err = ip6_dst_lookup(sk, &dst, &fl);
266 if (err)
267 goto done;
268
269 if (final_p)
270 ipv6_addr_copy(&fl.fl6_dst, final_p);
271
272 err = xfrm_lookup(&dst, &fl, sk, 0);
273 if (err < 0)
274 goto done;
275 }
276
277 skb = dccp_make_response(sk, dst, req);
278 if (skb != NULL) {
279 struct dccp_hdr *dh = dccp_hdr(skb);
280
281 dh->dccph_checksum = dccp_v6_csum_finish(skb,
282 &ireq6->loc_addr,
283 &ireq6->rmt_addr);
284 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
285 err = ip6_xmit(sk, skb, &fl, opt, 0);
286 err = net_xmit_eval(err);
287 }
288
289done:
290 if (opt != NULL && opt != np->opt)
291 sock_kfree_s(sk, opt, opt->tot_len);
292 dst_release(dst);
293 return err;
294}
295
296static void dccp_v6_reqsk_destructor(struct request_sock *req)
297{
298 if (inet6_rsk(req)->pktopts != NULL)
299 kfree_skb(inet6_rsk(req)->pktopts);
300}
301
302static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
303{
304 struct ipv6hdr *rxip6h;
305 struct sk_buff *skb;
306 struct flowi fl;
307
308 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
309 return;
310
311 if (!ipv6_unicast_destination(rxskb))
312 return;
313
314 skb = dccp_ctl_make_reset(dccp_v6_ctl_socket, rxskb);
315 if (skb == NULL)
316 return;
317
318 rxip6h = ipv6_hdr(rxskb);
319 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
320 &rxip6h->daddr);
321
322 memset(&fl, 0, sizeof(fl));
323 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
324 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
325
326 fl.proto = IPPROTO_DCCP;
327 fl.oif = inet6_iif(rxskb);
328 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
329 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
330 security_skb_classify_flow(rxskb, &fl);
331
332
333 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
334 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
335 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
336 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
337 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
338 return;
339 }
340 }
341
342 kfree_skb(skb);
343}
344
345static struct request_sock_ops dccp6_request_sock_ops = {
346 .family = AF_INET6,
347 .obj_size = sizeof(struct dccp6_request_sock),
348 .rtx_syn_ack = dccp_v6_send_response,
349 .send_ack = dccp_reqsk_send_ack,
350 .destructor = dccp_v6_reqsk_destructor,
351 .send_reset = dccp_v6_ctl_send_reset,
352};
353
354static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
355{
356 const struct dccp_hdr *dh = dccp_hdr(skb);
357 const struct ipv6hdr *iph = ipv6_hdr(skb);
358 struct sock *nsk;
359 struct request_sock **prev;
360
361 struct request_sock *req = inet6_csk_search_req(sk, &prev,
362 dh->dccph_sport,
363 &iph->saddr,
364 &iph->daddr,
365 inet6_iif(skb));
366 if (req != NULL)
367 return dccp_check_req(sk, skb, req, prev);
368
369 nsk = __inet6_lookup_established(&dccp_hashinfo,
370 &iph->saddr, dh->dccph_sport,
371 &iph->daddr, ntohs(dh->dccph_dport),
372 inet6_iif(skb));
373 if (nsk != NULL) {
374 if (nsk->sk_state != DCCP_TIME_WAIT) {
375 bh_lock_sock(nsk);
376 return nsk;
377 }
378 inet_twsk_put(inet_twsk(nsk));
379 return NULL;
380 }
381
382 return sk;
383}
384
385static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
386{
387 struct request_sock *req;
388 struct dccp_request_sock *dreq;
389 struct inet6_request_sock *ireq6;
390 struct ipv6_pinfo *np = inet6_sk(sk);
391 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
392 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
393
394 if (skb->protocol == htons(ETH_P_IP))
395 return dccp_v4_conn_request(sk, skb);
396
397 if (!ipv6_unicast_destination(skb))
398 return 0;
399
400 if (dccp_bad_service_code(sk, service)) {
401 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
402 goto drop;
403 }
404
405
406
407 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
408 if (inet_csk_reqsk_queue_is_full(sk))
409 goto drop;
410
411 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
412 goto drop;
413
414 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
415 if (req == NULL)
416 goto drop;
417
418 if (dccp_parse_options(sk, skb))
419 goto drop_and_free;
420
421 dccp_reqsk_init(req, skb);
422
423 if (security_inet_conn_request(sk, skb, req))
424 goto drop_and_free;
425
426 ireq6 = inet6_rsk(req);
427 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
428 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
429 ireq6->pktopts = NULL;
430
431 if (ipv6_opt_accepted(sk, skb) ||
432 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
433 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
434 atomic_inc(&skb->users);
435 ireq6->pktopts = skb;
436 }
437 ireq6->iif = sk->sk_bound_dev_if;
438
439
440 if (!sk->sk_bound_dev_if &&
441 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
442 ireq6->iif = inet6_iif(skb);
443
444
445
446
447
448
449
450
451
452 dreq = dccp_rsk(req);
453 dreq->dreq_isr = dcb->dccpd_seq;
454 dreq->dreq_iss = dccp_v6_init_sequence(skb);
455 dreq->dreq_service = service;
456
457 if (dccp_v6_send_response(sk, req, NULL))
458 goto drop_and_free;
459
460 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
461 return 0;
462
463drop_and_free:
464 reqsk_free(req);
465drop:
466 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
467 return -1;
468}
469
470static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
471 struct sk_buff *skb,
472 struct request_sock *req,
473 struct dst_entry *dst)
474{
475 struct inet6_request_sock *ireq6 = inet6_rsk(req);
476 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
477 struct inet_sock *newinet;
478 struct dccp_sock *newdp;
479 struct dccp6_sock *newdp6;
480 struct sock *newsk;
481 struct ipv6_txoptions *opt;
482
483 if (skb->protocol == htons(ETH_P_IP)) {
484
485
486
487 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
488 if (newsk == NULL)
489 return NULL;
490
491 newdp6 = (struct dccp6_sock *)newsk;
492 newdp = dccp_sk(newsk);
493 newinet = inet_sk(newsk);
494 newinet->pinet6 = &newdp6->inet6;
495 newnp = inet6_sk(newsk);
496
497 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
498
499 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
500 newinet->daddr);
501
502 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
503 newinet->saddr);
504
505 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
506
507 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
508 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
509 newnp->pktoptions = NULL;
510 newnp->opt = NULL;
511 newnp->mcast_oif = inet6_iif(skb);
512 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
513
514
515
516
517
518
519
520
521
522
523
524 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
525
526 return newsk;
527 }
528
529 opt = np->opt;
530
531 if (sk_acceptq_is_full(sk))
532 goto out_overflow;
533
534 if (dst == NULL) {
535 struct in6_addr *final_p = NULL, final;
536 struct flowi fl;
537
538 memset(&fl, 0, sizeof(fl));
539 fl.proto = IPPROTO_DCCP;
540 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
541 if (opt != NULL && opt->srcrt != NULL) {
542 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
543
544 ipv6_addr_copy(&final, &fl.fl6_dst);
545 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
546 final_p = &final;
547 }
548 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
549 fl.oif = sk->sk_bound_dev_if;
550 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
551 fl.fl_ip_sport = inet_sk(sk)->sport;
552 security_sk_classify_flow(sk, &fl);
553
554 if (ip6_dst_lookup(sk, &dst, &fl))
555 goto out;
556
557 if (final_p)
558 ipv6_addr_copy(&fl.fl6_dst, final_p);
559
560 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
561 goto out;
562 }
563
564 newsk = dccp_create_openreq_child(sk, req, skb);
565 if (newsk == NULL)
566 goto out;
567
568
569
570
571
572
573
574 __ip6_dst_store(newsk, dst, NULL, NULL);
575 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
576 NETIF_F_TSO);
577 newdp6 = (struct dccp6_sock *)newsk;
578 newinet = inet_sk(newsk);
579 newinet->pinet6 = &newdp6->inet6;
580 newdp = dccp_sk(newsk);
581 newnp = inet6_sk(newsk);
582
583 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
584
585 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
586 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
587 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
588 newsk->sk_bound_dev_if = ireq6->iif;
589
590
591
592
593
594 newinet->opt = NULL;
595
596
597 newnp->rxopt.all = np->rxopt.all;
598
599
600 newnp->pktoptions = NULL;
601 if (ireq6->pktopts != NULL) {
602 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
603 kfree_skb(ireq6->pktopts);
604 ireq6->pktopts = NULL;
605 if (newnp->pktoptions)
606 skb_set_owner_r(newnp->pktoptions, newsk);
607 }
608 newnp->opt = NULL;
609 newnp->mcast_oif = inet6_iif(skb);
610 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
611
612
613
614
615
616
617
618 if (opt != NULL) {
619 newnp->opt = ipv6_dup_options(newsk, opt);
620 if (opt != np->opt)
621 sock_kfree_s(sk, opt, opt->tot_len);
622 }
623
624 inet_csk(newsk)->icsk_ext_hdr_len = 0;
625 if (newnp->opt != NULL)
626 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
627 newnp->opt->opt_flen);
628
629 dccp_sync_mss(newsk, dst_mtu(dst));
630
631 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
632
633 __inet6_hash(&dccp_hashinfo, newsk);
634 inet_inherit_port(&dccp_hashinfo, sk, newsk);
635
636 return newsk;
637
638out_overflow:
639 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
640out:
641 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
642 if (opt != NULL && opt != np->opt)
643 sock_kfree_s(sk, opt, opt->tot_len);
644 dst_release(dst);
645 return NULL;
646}
647
648
649
650
651
652
653
654
655
656static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
657{
658 struct ipv6_pinfo *np = inet6_sk(sk);
659 struct sk_buff *opt_skb = NULL;
660
661
662
663
664
665
666
667
668
669 if (skb->protocol == htons(ETH_P_IP))
670 return dccp_v4_do_rcv(sk, skb);
671
672 if (sk_filter(sk, skb))
673 goto discard;
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693 if (np->rxopt.all)
694
695
696
697
698 opt_skb = skb_clone(skb, GFP_ATOMIC);
699
700 if (sk->sk_state == DCCP_OPEN) {
701 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
702 goto reset;
703 if (opt_skb) {
704
705 __kfree_skb(opt_skb);
706 }
707 return 0;
708 }
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734 if (sk->sk_state == DCCP_LISTEN) {
735 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
736
737 if (nsk == NULL)
738 goto discard;
739
740
741
742
743
744 if (nsk != sk) {
745 if (dccp_child_process(sk, nsk, skb))
746 goto reset;
747 if (opt_skb != NULL)
748 __kfree_skb(opt_skb);
749 return 0;
750 }
751 }
752
753 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
754 goto reset;
755 if (opt_skb) {
756
757 __kfree_skb(opt_skb);
758 }
759 return 0;
760
761reset:
762 dccp_v6_ctl_send_reset(sk, skb);
763discard:
764 if (opt_skb != NULL)
765 __kfree_skb(opt_skb);
766 kfree_skb(skb);
767 return 0;
768}
769
770static int dccp_v6_rcv(struct sk_buff *skb)
771{
772 const struct dccp_hdr *dh;
773 struct sock *sk;
774 int min_cov;
775
776
777
778 if (dccp_invalid_packet(skb))
779 goto discard_it;
780
781
782 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
783 &ipv6_hdr(skb)->daddr)) {
784 DCCP_WARN("dropped packet with invalid checksum\n");
785 goto discard_it;
786 }
787
788 dh = dccp_hdr(skb);
789
790 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
791 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
792
793 if (dccp_packet_without_ack(skb))
794 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
795 else
796 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
797
798
799
800 sk = __inet6_lookup(&dccp_hashinfo, &ipv6_hdr(skb)->saddr,
801 dh->dccph_sport,
802 &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
803 inet6_iif(skb));
804
805
806
807
808 if (sk == NULL) {
809 dccp_pr_debug("failed to look up flow ID in table and "
810 "get corresponding socket\n");
811 goto no_dccp_socket;
812 }
813
814
815
816
817
818
819
820 if (sk->sk_state == DCCP_TIME_WAIT) {
821 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
822 inet_twsk_put(inet_twsk(sk));
823 goto no_dccp_socket;
824 }
825
826
827
828
829
830
831 min_cov = dccp_sk(sk)->dccps_pcrlen;
832 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
833 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
834 dh->dccph_cscov, min_cov);
835
836 goto discard_and_relse;
837 }
838
839 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
840 goto discard_and_relse;
841
842 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
843
844no_dccp_socket:
845 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
846 goto discard_it;
847
848
849
850
851
852
853 if (dh->dccph_type != DCCP_PKT_RESET) {
854 DCCP_SKB_CB(skb)->dccpd_reset_code =
855 DCCP_RESET_CODE_NO_CONNECTION;
856 dccp_v6_ctl_send_reset(sk, skb);
857 }
858
859discard_it:
860 kfree_skb(skb);
861 return 0;
862
863discard_and_relse:
864 sock_put(sk);
865 goto discard_it;
866}
867
868static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
869 int addr_len)
870{
871 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
872 struct inet_connection_sock *icsk = inet_csk(sk);
873 struct inet_sock *inet = inet_sk(sk);
874 struct ipv6_pinfo *np = inet6_sk(sk);
875 struct dccp_sock *dp = dccp_sk(sk);
876 struct in6_addr *saddr = NULL, *final_p = NULL, final;
877 struct flowi fl;
878 struct dst_entry *dst;
879 int addr_type;
880 int err;
881
882 dp->dccps_role = DCCP_ROLE_CLIENT;
883
884 if (addr_len < SIN6_LEN_RFC2133)
885 return -EINVAL;
886
887 if (usin->sin6_family != AF_INET6)
888 return -EAFNOSUPPORT;
889
890 memset(&fl, 0, sizeof(fl));
891
892 if (np->sndflow) {
893 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
894 IP6_ECN_flow_init(fl.fl6_flowlabel);
895 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
896 struct ip6_flowlabel *flowlabel;
897 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
898 if (flowlabel == NULL)
899 return -EINVAL;
900 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
901 fl6_sock_release(flowlabel);
902 }
903 }
904
905
906
907 if (ipv6_addr_any(&usin->sin6_addr))
908 usin->sin6_addr.s6_addr[15] = 1;
909
910 addr_type = ipv6_addr_type(&usin->sin6_addr);
911
912 if (addr_type & IPV6_ADDR_MULTICAST)
913 return -ENETUNREACH;
914
915 if (addr_type & IPV6_ADDR_LINKLOCAL) {
916 if (addr_len >= sizeof(struct sockaddr_in6) &&
917 usin->sin6_scope_id) {
918
919
920
921 if (sk->sk_bound_dev_if &&
922 sk->sk_bound_dev_if != usin->sin6_scope_id)
923 return -EINVAL;
924
925 sk->sk_bound_dev_if = usin->sin6_scope_id;
926 }
927
928
929 if (!sk->sk_bound_dev_if)
930 return -EINVAL;
931 }
932
933 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
934 np->flow_label = fl.fl6_flowlabel;
935
936
937
938
939 if (addr_type == IPV6_ADDR_MAPPED) {
940 u32 exthdrlen = icsk->icsk_ext_hdr_len;
941 struct sockaddr_in sin;
942
943 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
944
945 if (__ipv6_only_sock(sk))
946 return -ENETUNREACH;
947
948 sin.sin_family = AF_INET;
949 sin.sin_port = usin->sin6_port;
950 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
951
952 icsk->icsk_af_ops = &dccp_ipv6_mapped;
953 sk->sk_backlog_rcv = dccp_v4_do_rcv;
954
955 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
956 if (err) {
957 icsk->icsk_ext_hdr_len = exthdrlen;
958 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
959 sk->sk_backlog_rcv = dccp_v6_do_rcv;
960 goto failure;
961 } else {
962 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
963 inet->saddr);
964 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
965 inet->rcv_saddr);
966 }
967
968 return err;
969 }
970
971 if (!ipv6_addr_any(&np->rcv_saddr))
972 saddr = &np->rcv_saddr;
973
974 fl.proto = IPPROTO_DCCP;
975 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
976 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
977 fl.oif = sk->sk_bound_dev_if;
978 fl.fl_ip_dport = usin->sin6_port;
979 fl.fl_ip_sport = inet->sport;
980 security_sk_classify_flow(sk, &fl);
981
982 if (np->opt != NULL && np->opt->srcrt != NULL) {
983 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
984
985 ipv6_addr_copy(&final, &fl.fl6_dst);
986 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
987 final_p = &final;
988 }
989
990 err = ip6_dst_lookup(sk, &dst, &fl);
991 if (err)
992 goto failure;
993
994 if (final_p)
995 ipv6_addr_copy(&fl.fl6_dst, final_p);
996
997 err = __xfrm_lookup(&dst, &fl, sk, 1);
998 if (err < 0) {
999 if (err == -EREMOTE)
1000 err = ip6_dst_blackhole(sk, &dst, &fl);
1001 if (err < 0)
1002 goto failure;
1003 }
1004
1005 if (saddr == NULL) {
1006 saddr = &fl.fl6_src;
1007 ipv6_addr_copy(&np->rcv_saddr, saddr);
1008 }
1009
1010
1011 ipv6_addr_copy(&np->saddr, saddr);
1012 inet->rcv_saddr = LOOPBACK4_IPV6;
1013
1014 __ip6_dst_store(sk, dst, NULL, NULL);
1015
1016 icsk->icsk_ext_hdr_len = 0;
1017 if (np->opt != NULL)
1018 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1019 np->opt->opt_nflen);
1020
1021 inet->dport = usin->sin6_port;
1022
1023 dccp_set_state(sk, DCCP_REQUESTING);
1024 err = inet6_hash_connect(&dccp_death_row, sk);
1025 if (err)
1026 goto late_failure;
1027
1028 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1029 np->daddr.s6_addr32,
1030 inet->sport, inet->dport);
1031 err = dccp_connect(sk);
1032 if (err)
1033 goto late_failure;
1034
1035 return 0;
1036
1037late_failure:
1038 dccp_set_state(sk, DCCP_CLOSED);
1039 __sk_dst_reset(sk);
1040failure:
1041 inet->dport = 0;
1042 sk->sk_route_caps = 0;
1043 return err;
1044}
1045
1046static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1047 .queue_xmit = inet6_csk_xmit,
1048 .send_check = dccp_v6_send_check,
1049 .rebuild_header = inet6_sk_rebuild_header,
1050 .conn_request = dccp_v6_conn_request,
1051 .syn_recv_sock = dccp_v6_request_recv_sock,
1052 .net_header_len = sizeof(struct ipv6hdr),
1053 .setsockopt = ipv6_setsockopt,
1054 .getsockopt = ipv6_getsockopt,
1055 .addr2sockaddr = inet6_csk_addr2sockaddr,
1056 .sockaddr_len = sizeof(struct sockaddr_in6),
1057#ifdef CONFIG_COMPAT
1058 .compat_setsockopt = compat_ipv6_setsockopt,
1059 .compat_getsockopt = compat_ipv6_getsockopt,
1060#endif
1061};
1062
1063
1064
1065
1066static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1067 .queue_xmit = ip_queue_xmit,
1068 .send_check = dccp_v4_send_check,
1069 .rebuild_header = inet_sk_rebuild_header,
1070 .conn_request = dccp_v6_conn_request,
1071 .syn_recv_sock = dccp_v6_request_recv_sock,
1072 .net_header_len = sizeof(struct iphdr),
1073 .setsockopt = ipv6_setsockopt,
1074 .getsockopt = ipv6_getsockopt,
1075 .addr2sockaddr = inet6_csk_addr2sockaddr,
1076 .sockaddr_len = sizeof(struct sockaddr_in6),
1077#ifdef CONFIG_COMPAT
1078 .compat_setsockopt = compat_ipv6_setsockopt,
1079 .compat_getsockopt = compat_ipv6_getsockopt,
1080#endif
1081};
1082
1083
1084
1085
1086static int dccp_v6_init_sock(struct sock *sk)
1087{
1088 static __u8 dccp_v6_ctl_sock_initialized;
1089 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1090
1091 if (err == 0) {
1092 if (unlikely(!dccp_v6_ctl_sock_initialized))
1093 dccp_v6_ctl_sock_initialized = 1;
1094 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1095 }
1096
1097 return err;
1098}
1099
1100static int dccp_v6_destroy_sock(struct sock *sk)
1101{
1102 dccp_destroy_sock(sk);
1103 return inet6_destroy_sock(sk);
1104}
1105
1106static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1107 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1108};
1109
1110DEFINE_PROTO_INUSE(dccp_v6)
1111
1112static struct proto dccp_v6_prot = {
1113 .name = "DCCPv6",
1114 .owner = THIS_MODULE,
1115 .close = dccp_close,
1116 .connect = dccp_v6_connect,
1117 .disconnect = dccp_disconnect,
1118 .ioctl = dccp_ioctl,
1119 .init = dccp_v6_init_sock,
1120 .setsockopt = dccp_setsockopt,
1121 .getsockopt = dccp_getsockopt,
1122 .sendmsg = dccp_sendmsg,
1123 .recvmsg = dccp_recvmsg,
1124 .backlog_rcv = dccp_v6_do_rcv,
1125 .hash = dccp_v6_hash,
1126 .unhash = dccp_unhash,
1127 .accept = inet_csk_accept,
1128 .get_port = dccp_v6_get_port,
1129 .shutdown = dccp_shutdown,
1130 .destroy = dccp_v6_destroy_sock,
1131 .orphan_count = &dccp_orphan_count,
1132 .max_header = MAX_DCCP_HEADER,
1133 .obj_size = sizeof(struct dccp6_sock),
1134 .rsk_prot = &dccp6_request_sock_ops,
1135 .twsk_prot = &dccp6_timewait_sock_ops,
1136#ifdef CONFIG_COMPAT
1137 .compat_setsockopt = compat_dccp_setsockopt,
1138 .compat_getsockopt = compat_dccp_getsockopt,
1139#endif
1140 REF_PROTO_INUSE(dccp_v6)
1141};
1142
1143static struct inet6_protocol dccp_v6_protocol = {
1144 .handler = dccp_v6_rcv,
1145 .err_handler = dccp_v6_err,
1146 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1147};
1148
1149static struct proto_ops inet6_dccp_ops = {
1150 .family = PF_INET6,
1151 .owner = THIS_MODULE,
1152 .release = inet6_release,
1153 .bind = inet6_bind,
1154 .connect = inet_stream_connect,
1155 .socketpair = sock_no_socketpair,
1156 .accept = inet_accept,
1157 .getname = inet6_getname,
1158 .poll = dccp_poll,
1159 .ioctl = inet6_ioctl,
1160 .listen = inet_dccp_listen,
1161 .shutdown = inet_shutdown,
1162 .setsockopt = sock_common_setsockopt,
1163 .getsockopt = sock_common_getsockopt,
1164 .sendmsg = inet_sendmsg,
1165 .recvmsg = sock_common_recvmsg,
1166 .mmap = sock_no_mmap,
1167 .sendpage = sock_no_sendpage,
1168#ifdef CONFIG_COMPAT
1169 .compat_setsockopt = compat_sock_common_setsockopt,
1170 .compat_getsockopt = compat_sock_common_getsockopt,
1171#endif
1172};
1173
1174static struct inet_protosw dccp_v6_protosw = {
1175 .type = SOCK_DCCP,
1176 .protocol = IPPROTO_DCCP,
1177 .prot = &dccp_v6_prot,
1178 .ops = &inet6_dccp_ops,
1179 .capability = -1,
1180 .flags = INET_PROTOSW_ICSK,
1181};
1182
1183static int __init dccp_v6_init(void)
1184{
1185 int err = proto_register(&dccp_v6_prot, 1);
1186
1187 if (err != 0)
1188 goto out;
1189
1190 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1191 if (err != 0)
1192 goto out_unregister_proto;
1193
1194 inet6_register_protosw(&dccp_v6_protosw);
1195
1196 err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1197 SOCK_DCCP, IPPROTO_DCCP);
1198 if (err != 0)
1199 goto out_unregister_protosw;
1200out:
1201 return err;
1202out_unregister_protosw:
1203 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1204 inet6_unregister_protosw(&dccp_v6_protosw);
1205out_unregister_proto:
1206 proto_unregister(&dccp_v6_prot);
1207 goto out;
1208}
1209
1210static void __exit dccp_v6_exit(void)
1211{
1212 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1213 inet6_unregister_protosw(&dccp_v6_protosw);
1214 proto_unregister(&dccp_v6_prot);
1215}
1216
1217module_init(dccp_v6_init);
1218module_exit(dccp_v6_exit);
1219
1220
1221
1222
1223
1224
1225MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1226MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1227MODULE_LICENSE("GPL");
1228MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1229MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
1230