1
2
3
4
5
6
7
8
9
10
11
12
13
14
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
37
38static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
39static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
40
41static void dccp_v6_hash(struct sock *sk)
42{
43 if (sk->sk_state != DCCP_CLOSED) {
44 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
45 inet_hash(sk);
46 return;
47 }
48 local_bh_disable();
49 __inet6_hash(sk);
50 local_bh_enable();
51 }
52}
53
54
55static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
56 struct in6_addr *saddr,
57 struct in6_addr *daddr)
58{
59 return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
60}
61
62static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
63 struct sk_buff *skb)
64{
65 struct ipv6_pinfo *np = inet6_sk(sk);
66 struct dccp_hdr *dh = dccp_hdr(skb);
67
68 dccp_csum_outgoing(skb);
69 dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
70}
71
72static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
73 __be16 sport, __be16 dport )
74{
75 return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
76}
77
78static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
79{
80 return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
81 ipv6_hdr(skb)->saddr.s6_addr32,
82 dccp_hdr(skb)->dccph_dport,
83 dccp_hdr(skb)->dccph_sport );
84
85}
86
87static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
88 u8 type, u8 code, int offset, __be32 info)
89{
90 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
91 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
92 struct dccp_sock *dp;
93 struct ipv6_pinfo *np;
94 struct sock *sk;
95 int err;
96 __u64 seq;
97 struct net *net = dev_net(skb->dev);
98
99 if (skb->len < offset + sizeof(*dh) ||
100 skb->len < offset + __dccp_basic_hdr_len(dh)) {
101 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
102 ICMP6_MIB_INERRORS);
103 return;
104 }
105
106 sk = inet6_lookup(net, &dccp_hashinfo,
107 &hdr->daddr, dh->dccph_dport,
108 &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
109
110 if (sk == NULL) {
111 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
112 ICMP6_MIB_INERRORS);
113 return;
114 }
115
116 if (sk->sk_state == DCCP_TIME_WAIT) {
117 inet_twsk_put(inet_twsk(sk));
118 return;
119 }
120
121 bh_lock_sock(sk);
122 if (sock_owned_by_user(sk))
123 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
124
125 if (sk->sk_state == DCCP_CLOSED)
126 goto out;
127
128 dp = dccp_sk(sk);
129 seq = dccp_hdr_seq(dh);
130 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
131 !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
132 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
133 goto out;
134 }
135
136 np = inet6_sk(sk);
137
138 if (type == ICMPV6_PKT_TOOBIG) {
139 struct dst_entry *dst = NULL;
140
141 if (sock_owned_by_user(sk))
142 goto out;
143 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
144 goto out;
145
146
147 dst = __sk_dst_check(sk, np->dst_cookie);
148 if (dst == NULL) {
149 struct inet_sock *inet = inet_sk(sk);
150 struct flowi fl;
151
152
153
154
155
156 memset(&fl, 0, sizeof(fl));
157 fl.proto = IPPROTO_DCCP;
158 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
159 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
160 fl.oif = sk->sk_bound_dev_if;
161 fl.fl_ip_dport = inet->dport;
162 fl.fl_ip_sport = inet->sport;
163 security_sk_classify_flow(sk, &fl);
164
165 err = ip6_dst_lookup(sk, &dst, &fl);
166 if (err) {
167 sk->sk_err_soft = -err;
168 goto out;
169 }
170
171 err = xfrm_lookup(net, &dst, &fl, sk, 0);
172 if (err < 0) {
173 sk->sk_err_soft = -err;
174 goto out;
175 }
176 } else
177 dst_hold(dst);
178
179 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
180 dccp_sync_mss(sk, dst_mtu(dst));
181 }
182 dst_release(dst);
183 goto out;
184 }
185
186 icmpv6_err_convert(type, code, &err);
187
188
189 switch (sk->sk_state) {
190 struct request_sock *req, **prev;
191 case DCCP_LISTEN:
192 if (sock_owned_by_user(sk))
193 goto out;
194
195 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
196 &hdr->daddr, &hdr->saddr,
197 inet6_iif(skb));
198 if (req == NULL)
199 goto out;
200
201
202
203
204
205 WARN_ON(req->sk != NULL);
206
207 if (seq != dccp_rsk(req)->dreq_iss) {
208 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
209 goto out;
210 }
211
212 inet_csk_reqsk_queue_drop(sk, req, prev);
213 goto out;
214
215 case DCCP_REQUESTING:
216 case DCCP_RESPOND:
217
218 if (!sock_owned_by_user(sk)) {
219 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
220 sk->sk_err = err;
221
222
223
224
225 sk->sk_error_report(sk);
226 dccp_done(sk);
227 } else
228 sk->sk_err_soft = err;
229 goto out;
230 }
231
232 if (!sock_owned_by_user(sk) && np->recverr) {
233 sk->sk_err = err;
234 sk->sk_error_report(sk);
235 } else
236 sk->sk_err_soft = err;
237
238out:
239 bh_unlock_sock(sk);
240 sock_put(sk);
241}
242
243
244static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
245{
246 struct inet6_request_sock *ireq6 = inet6_rsk(req);
247 struct ipv6_pinfo *np = inet6_sk(sk);
248 struct sk_buff *skb;
249 struct ipv6_txoptions *opt = NULL;
250 struct in6_addr *final_p = NULL, final;
251 struct flowi fl;
252 int err = -1;
253 struct dst_entry *dst;
254
255 memset(&fl, 0, sizeof(fl));
256 fl.proto = IPPROTO_DCCP;
257 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
258 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
259 fl.fl6_flowlabel = 0;
260 fl.oif = ireq6->iif;
261 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
262 fl.fl_ip_sport = inet_rsk(req)->loc_port;
263 security_req_classify_flow(req, &fl);
264
265 opt = np->opt;
266
267 if (opt != NULL && opt->srcrt != NULL) {
268 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
269
270 ipv6_addr_copy(&final, &fl.fl6_dst);
271 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
272 final_p = &final;
273 }
274
275 err = ip6_dst_lookup(sk, &dst, &fl);
276 if (err)
277 goto done;
278
279 if (final_p)
280 ipv6_addr_copy(&fl.fl6_dst, final_p);
281
282 err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0);
283 if (err < 0)
284 goto done;
285
286 skb = dccp_make_response(sk, dst, req);
287 if (skb != NULL) {
288 struct dccp_hdr *dh = dccp_hdr(skb);
289
290 dh->dccph_checksum = dccp_v6_csum_finish(skb,
291 &ireq6->loc_addr,
292 &ireq6->rmt_addr);
293 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
294 err = ip6_xmit(sk, skb, &fl, opt, 0);
295 err = net_xmit_eval(err);
296 }
297
298done:
299 if (opt != NULL && opt != np->opt)
300 sock_kfree_s(sk, opt, opt->tot_len);
301 dst_release(dst);
302 return err;
303}
304
305static void dccp_v6_reqsk_destructor(struct request_sock *req)
306{
307 dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
308 if (inet6_rsk(req)->pktopts != NULL)
309 kfree_skb(inet6_rsk(req)->pktopts);
310}
311
312static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
313{
314 struct ipv6hdr *rxip6h;
315 struct sk_buff *skb;
316 struct flowi fl;
317 struct net *net = dev_net(skb_dst(rxskb)->dev);
318 struct sock *ctl_sk = net->dccp.v6_ctl_sk;
319 struct dst_entry *dst;
320
321 if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
322 return;
323
324 if (!ipv6_unicast_destination(rxskb))
325 return;
326
327 skb = dccp_ctl_make_reset(ctl_sk, rxskb);
328 if (skb == NULL)
329 return;
330
331 rxip6h = ipv6_hdr(rxskb);
332 dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
333 &rxip6h->daddr);
334
335 memset(&fl, 0, sizeof(fl));
336 ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
337 ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
338
339 fl.proto = IPPROTO_DCCP;
340 fl.oif = inet6_iif(rxskb);
341 fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
342 fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
343 security_skb_classify_flow(rxskb, &fl);
344
345
346 if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
347 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
348 skb_dst_set(skb, dst);
349 ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
350 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
351 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
352 return;
353 }
354 }
355
356 kfree_skb(skb);
357}
358
359static struct request_sock_ops dccp6_request_sock_ops = {
360 .family = AF_INET6,
361 .obj_size = sizeof(struct dccp6_request_sock),
362 .rtx_syn_ack = dccp_v6_send_response,
363 .send_ack = dccp_reqsk_send_ack,
364 .destructor = dccp_v6_reqsk_destructor,
365 .send_reset = dccp_v6_ctl_send_reset,
366};
367
368static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
369{
370 const struct dccp_hdr *dh = dccp_hdr(skb);
371 const struct ipv6hdr *iph = ipv6_hdr(skb);
372 struct sock *nsk;
373 struct request_sock **prev;
374
375 struct request_sock *req = inet6_csk_search_req(sk, &prev,
376 dh->dccph_sport,
377 &iph->saddr,
378 &iph->daddr,
379 inet6_iif(skb));
380 if (req != NULL)
381 return dccp_check_req(sk, skb, req, prev);
382
383 nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
384 &iph->saddr, dh->dccph_sport,
385 &iph->daddr, ntohs(dh->dccph_dport),
386 inet6_iif(skb));
387 if (nsk != NULL) {
388 if (nsk->sk_state != DCCP_TIME_WAIT) {
389 bh_lock_sock(nsk);
390 return nsk;
391 }
392 inet_twsk_put(inet_twsk(nsk));
393 return NULL;
394 }
395
396 return sk;
397}
398
399static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
400{
401 struct request_sock *req;
402 struct dccp_request_sock *dreq;
403 struct inet6_request_sock *ireq6;
404 struct ipv6_pinfo *np = inet6_sk(sk);
405 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
406 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
407
408 if (skb->protocol == htons(ETH_P_IP))
409 return dccp_v4_conn_request(sk, skb);
410
411 if (!ipv6_unicast_destination(skb))
412 return 0;
413
414 if (dccp_bad_service_code(sk, service)) {
415 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
416 goto drop;
417 }
418
419
420
421 dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
422 if (inet_csk_reqsk_queue_is_full(sk))
423 goto drop;
424
425 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
426 goto drop;
427
428 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
429 if (req == NULL)
430 goto drop;
431
432 if (dccp_reqsk_init(req, dccp_sk(sk), skb))
433 goto drop_and_free;
434
435 dreq = dccp_rsk(req);
436 if (dccp_parse_options(sk, dreq, skb))
437 goto drop_and_free;
438
439 if (security_inet_conn_request(sk, skb, req))
440 goto drop_and_free;
441
442 ireq6 = inet6_rsk(req);
443 ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
444 ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
445
446 if (ipv6_opt_accepted(sk, skb) ||
447 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
448 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
449 atomic_inc(&skb->users);
450 ireq6->pktopts = skb;
451 }
452 ireq6->iif = sk->sk_bound_dev_if;
453
454
455 if (!sk->sk_bound_dev_if &&
456 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
457 ireq6->iif = inet6_iif(skb);
458
459
460
461
462
463
464
465
466
467 dreq->dreq_isr = dcb->dccpd_seq;
468 dreq->dreq_iss = dccp_v6_init_sequence(skb);
469 dreq->dreq_service = service;
470
471 if (dccp_v6_send_response(sk, req))
472 goto drop_and_free;
473
474 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
475 return 0;
476
477drop_and_free:
478 reqsk_free(req);
479drop:
480 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
481 return -1;
482}
483
484static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
485 struct sk_buff *skb,
486 struct request_sock *req,
487 struct dst_entry *dst)
488{
489 struct inet6_request_sock *ireq6 = inet6_rsk(req);
490 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
491 struct inet_sock *newinet;
492 struct dccp_sock *newdp;
493 struct dccp6_sock *newdp6;
494 struct sock *newsk;
495 struct ipv6_txoptions *opt;
496
497 if (skb->protocol == htons(ETH_P_IP)) {
498
499
500
501 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
502 if (newsk == NULL)
503 return NULL;
504
505 newdp6 = (struct dccp6_sock *)newsk;
506 newdp = dccp_sk(newsk);
507 newinet = inet_sk(newsk);
508 newinet->pinet6 = &newdp6->inet6;
509 newnp = inet6_sk(newsk);
510
511 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
512
513 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
514 newinet->daddr);
515
516 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
517 newinet->saddr);
518
519 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
520
521 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
522 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
523 newnp->pktoptions = NULL;
524 newnp->opt = NULL;
525 newnp->mcast_oif = inet6_iif(skb);
526 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
527
528
529
530
531
532
533
534
535
536
537
538 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
539
540 return newsk;
541 }
542
543 opt = np->opt;
544
545 if (sk_acceptq_is_full(sk))
546 goto out_overflow;
547
548 if (dst == NULL) {
549 struct in6_addr *final_p = NULL, final;
550 struct flowi fl;
551
552 memset(&fl, 0, sizeof(fl));
553 fl.proto = IPPROTO_DCCP;
554 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
555 if (opt != NULL && opt->srcrt != NULL) {
556 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
557
558 ipv6_addr_copy(&final, &fl.fl6_dst);
559 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
560 final_p = &final;
561 }
562 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
563 fl.oif = sk->sk_bound_dev_if;
564 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
565 fl.fl_ip_sport = inet_rsk(req)->loc_port;
566 security_sk_classify_flow(sk, &fl);
567
568 if (ip6_dst_lookup(sk, &dst, &fl))
569 goto out;
570
571 if (final_p)
572 ipv6_addr_copy(&fl.fl6_dst, final_p);
573
574 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
575 goto out;
576 }
577
578 newsk = dccp_create_openreq_child(sk, req, skb);
579 if (newsk == NULL)
580 goto out;
581
582
583
584
585
586
587
588 __ip6_dst_store(newsk, dst, NULL, NULL);
589 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
590 NETIF_F_TSO);
591 newdp6 = (struct dccp6_sock *)newsk;
592 newinet = inet_sk(newsk);
593 newinet->pinet6 = &newdp6->inet6;
594 newdp = dccp_sk(newsk);
595 newnp = inet6_sk(newsk);
596
597 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
598
599 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
600 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
601 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
602 newsk->sk_bound_dev_if = ireq6->iif;
603
604
605
606
607
608 newinet->opt = NULL;
609
610
611 newnp->rxopt.all = np->rxopt.all;
612
613
614 newnp->pktoptions = NULL;
615 if (ireq6->pktopts != NULL) {
616 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
617 kfree_skb(ireq6->pktopts);
618 ireq6->pktopts = NULL;
619 if (newnp->pktoptions)
620 skb_set_owner_r(newnp->pktoptions, newsk);
621 }
622 newnp->opt = NULL;
623 newnp->mcast_oif = inet6_iif(skb);
624 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
625
626
627
628
629
630
631
632 if (opt != NULL) {
633 newnp->opt = ipv6_dup_options(newsk, opt);
634 if (opt != np->opt)
635 sock_kfree_s(sk, opt, opt->tot_len);
636 }
637
638 inet_csk(newsk)->icsk_ext_hdr_len = 0;
639 if (newnp->opt != NULL)
640 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
641 newnp->opt->opt_flen);
642
643 dccp_sync_mss(newsk, dst_mtu(dst));
644
645 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
646
647 __inet6_hash(newsk);
648 __inet_inherit_port(sk, newsk);
649
650 return newsk;
651
652out_overflow:
653 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
654out:
655 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
656 if (opt != NULL && opt != np->opt)
657 sock_kfree_s(sk, opt, opt->tot_len);
658 dst_release(dst);
659 return NULL;
660}
661
662
663
664
665
666
667
668
669
670static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
671{
672 struct ipv6_pinfo *np = inet6_sk(sk);
673 struct sk_buff *opt_skb = NULL;
674
675
676
677
678
679
680
681
682
683 if (skb->protocol == htons(ETH_P_IP))
684 return dccp_v4_do_rcv(sk, skb);
685
686 if (sk_filter(sk, skb))
687 goto discard;
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707 if (np->rxopt.all)
708
709
710
711
712 opt_skb = skb_clone(skb, GFP_ATOMIC);
713
714 if (sk->sk_state == DCCP_OPEN) {
715 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
716 goto reset;
717 if (opt_skb) {
718
719 __kfree_skb(opt_skb);
720 }
721 return 0;
722 }
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748 if (sk->sk_state == DCCP_LISTEN) {
749 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
750
751 if (nsk == NULL)
752 goto discard;
753
754
755
756
757
758 if (nsk != sk) {
759 if (dccp_child_process(sk, nsk, skb))
760 goto reset;
761 if (opt_skb != NULL)
762 __kfree_skb(opt_skb);
763 return 0;
764 }
765 }
766
767 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
768 goto reset;
769 if (opt_skb) {
770
771 __kfree_skb(opt_skb);
772 }
773 return 0;
774
775reset:
776 dccp_v6_ctl_send_reset(sk, skb);
777discard:
778 if (opt_skb != NULL)
779 __kfree_skb(opt_skb);
780 kfree_skb(skb);
781 return 0;
782}
783
784static int dccp_v6_rcv(struct sk_buff *skb)
785{
786 const struct dccp_hdr *dh;
787 struct sock *sk;
788 int min_cov;
789
790
791
792 if (dccp_invalid_packet(skb))
793 goto discard_it;
794
795
796 if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
797 &ipv6_hdr(skb)->daddr)) {
798 DCCP_WARN("dropped packet with invalid checksum\n");
799 goto discard_it;
800 }
801
802 dh = dccp_hdr(skb);
803
804 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
805 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
806
807 if (dccp_packet_without_ack(skb))
808 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
809 else
810 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
811
812
813
814 sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
815 dh->dccph_sport, dh->dccph_dport);
816
817
818
819
820 if (sk == NULL) {
821 dccp_pr_debug("failed to look up flow ID in table and "
822 "get corresponding socket\n");
823 goto no_dccp_socket;
824 }
825
826
827
828
829
830
831
832 if (sk->sk_state == DCCP_TIME_WAIT) {
833 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
834 inet_twsk_put(inet_twsk(sk));
835 goto no_dccp_socket;
836 }
837
838
839
840
841
842
843 min_cov = dccp_sk(sk)->dccps_pcrlen;
844 if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
845 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
846 dh->dccph_cscov, min_cov);
847
848 goto discard_and_relse;
849 }
850
851 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
852 goto discard_and_relse;
853
854 return sk_receive_skb(sk, skb, 1) ? -1 : 0;
855
856no_dccp_socket:
857 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
858 goto discard_it;
859
860
861
862
863
864
865 if (dh->dccph_type != DCCP_PKT_RESET) {
866 DCCP_SKB_CB(skb)->dccpd_reset_code =
867 DCCP_RESET_CODE_NO_CONNECTION;
868 dccp_v6_ctl_send_reset(sk, skb);
869 }
870
871discard_it:
872 kfree_skb(skb);
873 return 0;
874
875discard_and_relse:
876 sock_put(sk);
877 goto discard_it;
878}
879
880static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
881 int addr_len)
882{
883 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
884 struct inet_connection_sock *icsk = inet_csk(sk);
885 struct inet_sock *inet = inet_sk(sk);
886 struct ipv6_pinfo *np = inet6_sk(sk);
887 struct dccp_sock *dp = dccp_sk(sk);
888 struct in6_addr *saddr = NULL, *final_p = NULL, final;
889 struct flowi fl;
890 struct dst_entry *dst;
891 int addr_type;
892 int err;
893
894 dp->dccps_role = DCCP_ROLE_CLIENT;
895
896 if (addr_len < SIN6_LEN_RFC2133)
897 return -EINVAL;
898
899 if (usin->sin6_family != AF_INET6)
900 return -EAFNOSUPPORT;
901
902 memset(&fl, 0, sizeof(fl));
903
904 if (np->sndflow) {
905 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
906 IP6_ECN_flow_init(fl.fl6_flowlabel);
907 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
908 struct ip6_flowlabel *flowlabel;
909 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
910 if (flowlabel == NULL)
911 return -EINVAL;
912 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
913 fl6_sock_release(flowlabel);
914 }
915 }
916
917
918
919 if (ipv6_addr_any(&usin->sin6_addr))
920 usin->sin6_addr.s6_addr[15] = 1;
921
922 addr_type = ipv6_addr_type(&usin->sin6_addr);
923
924 if (addr_type & IPV6_ADDR_MULTICAST)
925 return -ENETUNREACH;
926
927 if (addr_type & IPV6_ADDR_LINKLOCAL) {
928 if (addr_len >= sizeof(struct sockaddr_in6) &&
929 usin->sin6_scope_id) {
930
931
932
933 if (sk->sk_bound_dev_if &&
934 sk->sk_bound_dev_if != usin->sin6_scope_id)
935 return -EINVAL;
936
937 sk->sk_bound_dev_if = usin->sin6_scope_id;
938 }
939
940
941 if (!sk->sk_bound_dev_if)
942 return -EINVAL;
943 }
944
945 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
946 np->flow_label = fl.fl6_flowlabel;
947
948
949
950
951 if (addr_type == IPV6_ADDR_MAPPED) {
952 u32 exthdrlen = icsk->icsk_ext_hdr_len;
953 struct sockaddr_in sin;
954
955 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
956
957 if (__ipv6_only_sock(sk))
958 return -ENETUNREACH;
959
960 sin.sin_family = AF_INET;
961 sin.sin_port = usin->sin6_port;
962 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
963
964 icsk->icsk_af_ops = &dccp_ipv6_mapped;
965 sk->sk_backlog_rcv = dccp_v4_do_rcv;
966
967 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
968 if (err) {
969 icsk->icsk_ext_hdr_len = exthdrlen;
970 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
971 sk->sk_backlog_rcv = dccp_v6_do_rcv;
972 goto failure;
973 } else {
974 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
975 inet->saddr);
976 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
977 inet->rcv_saddr);
978 }
979
980 return err;
981 }
982
983 if (!ipv6_addr_any(&np->rcv_saddr))
984 saddr = &np->rcv_saddr;
985
986 fl.proto = IPPROTO_DCCP;
987 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
988 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
989 fl.oif = sk->sk_bound_dev_if;
990 fl.fl_ip_dport = usin->sin6_port;
991 fl.fl_ip_sport = inet->sport;
992 security_sk_classify_flow(sk, &fl);
993
994 if (np->opt != NULL && np->opt->srcrt != NULL) {
995 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
996
997 ipv6_addr_copy(&final, &fl.fl6_dst);
998 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
999 final_p = &final;
1000 }
1001
1002 err = ip6_dst_lookup(sk, &dst, &fl);
1003 if (err)
1004 goto failure;
1005
1006 if (final_p)
1007 ipv6_addr_copy(&fl.fl6_dst, final_p);
1008
1009 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1010 if (err < 0) {
1011 if (err == -EREMOTE)
1012 err = ip6_dst_blackhole(sk, &dst, &fl);
1013 if (err < 0)
1014 goto failure;
1015 }
1016
1017 if (saddr == NULL) {
1018 saddr = &fl.fl6_src;
1019 ipv6_addr_copy(&np->rcv_saddr, saddr);
1020 }
1021
1022
1023 ipv6_addr_copy(&np->saddr, saddr);
1024 inet->rcv_saddr = LOOPBACK4_IPV6;
1025
1026 __ip6_dst_store(sk, dst, NULL, NULL);
1027
1028 icsk->icsk_ext_hdr_len = 0;
1029 if (np->opt != NULL)
1030 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1031 np->opt->opt_nflen);
1032
1033 inet->dport = usin->sin6_port;
1034
1035 dccp_set_state(sk, DCCP_REQUESTING);
1036 err = inet6_hash_connect(&dccp_death_row, sk);
1037 if (err)
1038 goto late_failure;
1039
1040 dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1041 np->daddr.s6_addr32,
1042 inet->sport, inet->dport);
1043 err = dccp_connect(sk);
1044 if (err)
1045 goto late_failure;
1046
1047 return 0;
1048
1049late_failure:
1050 dccp_set_state(sk, DCCP_CLOSED);
1051 __sk_dst_reset(sk);
1052failure:
1053 inet->dport = 0;
1054 sk->sk_route_caps = 0;
1055 return err;
1056}
1057
1058static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1059 .queue_xmit = inet6_csk_xmit,
1060 .send_check = dccp_v6_send_check,
1061 .rebuild_header = inet6_sk_rebuild_header,
1062 .conn_request = dccp_v6_conn_request,
1063 .syn_recv_sock = dccp_v6_request_recv_sock,
1064 .net_header_len = sizeof(struct ipv6hdr),
1065 .setsockopt = ipv6_setsockopt,
1066 .getsockopt = ipv6_getsockopt,
1067 .addr2sockaddr = inet6_csk_addr2sockaddr,
1068 .sockaddr_len = sizeof(struct sockaddr_in6),
1069 .bind_conflict = inet6_csk_bind_conflict,
1070#ifdef CONFIG_COMPAT
1071 .compat_setsockopt = compat_ipv6_setsockopt,
1072 .compat_getsockopt = compat_ipv6_getsockopt,
1073#endif
1074};
1075
1076
1077
1078
1079static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1080 .queue_xmit = ip_queue_xmit,
1081 .send_check = dccp_v4_send_check,
1082 .rebuild_header = inet_sk_rebuild_header,
1083 .conn_request = dccp_v6_conn_request,
1084 .syn_recv_sock = dccp_v6_request_recv_sock,
1085 .net_header_len = sizeof(struct iphdr),
1086 .setsockopt = ipv6_setsockopt,
1087 .getsockopt = ipv6_getsockopt,
1088 .addr2sockaddr = inet6_csk_addr2sockaddr,
1089 .sockaddr_len = sizeof(struct sockaddr_in6),
1090#ifdef CONFIG_COMPAT
1091 .compat_setsockopt = compat_ipv6_setsockopt,
1092 .compat_getsockopt = compat_ipv6_getsockopt,
1093#endif
1094};
1095
1096
1097
1098
1099static int dccp_v6_init_sock(struct sock *sk)
1100{
1101 static __u8 dccp_v6_ctl_sock_initialized;
1102 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1103
1104 if (err == 0) {
1105 if (unlikely(!dccp_v6_ctl_sock_initialized))
1106 dccp_v6_ctl_sock_initialized = 1;
1107 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1108 }
1109
1110 return err;
1111}
1112
1113static void dccp_v6_destroy_sock(struct sock *sk)
1114{
1115 dccp_destroy_sock(sk);
1116 inet6_destroy_sock(sk);
1117}
1118
1119static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1120 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
1121};
1122
1123static struct proto dccp_v6_prot = {
1124 .name = "DCCPv6",
1125 .owner = THIS_MODULE,
1126 .close = dccp_close,
1127 .connect = dccp_v6_connect,
1128 .disconnect = dccp_disconnect,
1129 .ioctl = dccp_ioctl,
1130 .init = dccp_v6_init_sock,
1131 .setsockopt = dccp_setsockopt,
1132 .getsockopt = dccp_getsockopt,
1133 .sendmsg = dccp_sendmsg,
1134 .recvmsg = dccp_recvmsg,
1135 .backlog_rcv = dccp_v6_do_rcv,
1136 .hash = dccp_v6_hash,
1137 .unhash = inet_unhash,
1138 .accept = inet_csk_accept,
1139 .get_port = inet_csk_get_port,
1140 .shutdown = dccp_shutdown,
1141 .destroy = dccp_v6_destroy_sock,
1142 .orphan_count = &dccp_orphan_count,
1143 .max_header = MAX_DCCP_HEADER,
1144 .obj_size = sizeof(struct dccp6_sock),
1145 .slab_flags = SLAB_DESTROY_BY_RCU,
1146 .rsk_prot = &dccp6_request_sock_ops,
1147 .twsk_prot = &dccp6_timewait_sock_ops,
1148 .h.hashinfo = &dccp_hashinfo,
1149#ifdef CONFIG_COMPAT
1150 .compat_setsockopt = compat_dccp_setsockopt,
1151 .compat_getsockopt = compat_dccp_getsockopt,
1152#endif
1153};
1154
1155static const struct inet6_protocol dccp_v6_protocol = {
1156 .handler = dccp_v6_rcv,
1157 .err_handler = dccp_v6_err,
1158 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1159};
1160
1161static const struct proto_ops inet6_dccp_ops = {
1162 .family = PF_INET6,
1163 .owner = THIS_MODULE,
1164 .release = inet6_release,
1165 .bind = inet6_bind,
1166 .connect = inet_stream_connect,
1167 .socketpair = sock_no_socketpair,
1168 .accept = inet_accept,
1169 .getname = inet6_getname,
1170 .poll = dccp_poll,
1171 .ioctl = inet6_ioctl,
1172 .listen = inet_dccp_listen,
1173 .shutdown = inet_shutdown,
1174 .setsockopt = sock_common_setsockopt,
1175 .getsockopt = sock_common_getsockopt,
1176 .sendmsg = inet_sendmsg,
1177 .recvmsg = sock_common_recvmsg,
1178 .mmap = sock_no_mmap,
1179 .sendpage = sock_no_sendpage,
1180#ifdef CONFIG_COMPAT
1181 .compat_setsockopt = compat_sock_common_setsockopt,
1182 .compat_getsockopt = compat_sock_common_getsockopt,
1183#endif
1184};
1185
1186static struct inet_protosw dccp_v6_protosw = {
1187 .type = SOCK_DCCP,
1188 .protocol = IPPROTO_DCCP,
1189 .prot = &dccp_v6_prot,
1190 .ops = &inet6_dccp_ops,
1191 .capability = -1,
1192 .flags = INET_PROTOSW_ICSK,
1193};
1194
1195static int dccp_v6_init_net(struct net *net)
1196{
1197 int err;
1198
1199 err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1200 SOCK_DCCP, IPPROTO_DCCP, net);
1201 return err;
1202}
1203
1204static void dccp_v6_exit_net(struct net *net)
1205{
1206 inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1207}
1208
1209static struct pernet_operations dccp_v6_ops = {
1210 .init = dccp_v6_init_net,
1211 .exit = dccp_v6_exit_net,
1212};
1213
1214static int __init dccp_v6_init(void)
1215{
1216 int err = proto_register(&dccp_v6_prot, 1);
1217
1218 if (err != 0)
1219 goto out;
1220
1221 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1222 if (err != 0)
1223 goto out_unregister_proto;
1224
1225 inet6_register_protosw(&dccp_v6_protosw);
1226
1227 err = register_pernet_subsys(&dccp_v6_ops);
1228 if (err != 0)
1229 goto out_destroy_ctl_sock;
1230out:
1231 return err;
1232
1233out_destroy_ctl_sock:
1234 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1235 inet6_unregister_protosw(&dccp_v6_protosw);
1236out_unregister_proto:
1237 proto_unregister(&dccp_v6_prot);
1238 goto out;
1239}
1240
1241static void __exit dccp_v6_exit(void)
1242{
1243 unregister_pernet_subsys(&dccp_v6_ops);
1244 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1245 inet6_unregister_protosw(&dccp_v6_protosw);
1246 proto_unregister(&dccp_v6_prot);
1247}
1248
1249module_init(dccp_v6_init);
1250module_exit(dccp_v6_exit);
1251
1252
1253
1254
1255
1256
1257MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1258MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1259MODULE_LICENSE("GPL");
1260MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1261MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
1262