7f51e8db3967280e7698fb1c916a64c6c4a5b24c
[linux-2.6.git] / net / dccp / ipv6.c
1 /*
2  *      DCCP over IPv6
3  *      Linux INET6 implementation
4  *
5  *      Based on net/dccp6/ipv6.c
6  *
7  *      Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
8  *
9  *      This program is free software; you can redistribute it and/or
10  *      modify it under the terms of the GNU General Public License
11  *      as published by the Free Software Foundation; either version
12  *      2 of the License, or (at your option) any later version.
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 /* Socket used for sending RSTs and ACKs */
37 static struct socket *dccp_v6_ctl_socket;
38
39 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
40 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
41
42 static 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
48 static 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 /* add pseudo-header to DCCP checksum stored in skb->csum */
62 static 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
69 static 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
79 static 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
85 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
86 {
87         return secure_dccpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
88                                              skb->nh.ipv6h->saddr.s6_addr32,
89                                              dccp_hdr(skb)->dccph_dport,
90                                              dccp_hdr(skb)->dccph_sport     );
91
92 }
93
94 static 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                 /* icmp should have updated the destination cache entry */
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                         /* BUGGG_FUTURE: Again, it is not clear how
141                            to handle rthdr case. Ignore this complexity
142                            for now.
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                 } /* else let the usual retransmit timer handle it */
170                 dst_release(dst);
171                 goto out;
172         }
173
174         icmpv6_err_convert(type, code, &err);
175
176         seq = DCCP_SKB_CB(skb)->dccpd_seq;
177         /* Might be for an request_sock */
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                  * ICMPs are not backlogged, hence we cannot get an established
192                  * socket here.
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:  /* Cannot happen.
206                                It can, it SYNs are crossed. --ANK */
207                 if (!sock_owned_by_user(sk)) {
208                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
209                         sk->sk_err = err;
210                         /*
211                          * Wake people up to see the error
212                          * (see connect in sock.c)
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
227 out:
228         bh_unlock_sock(sk);
229         sock_put(sk);
230 }
231
232
233 static 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                 if (opt == NULL &&
257                     np->rxopt.bits.osrcrt == 2 &&
258                     ireq6->pktopts) {
259                         struct sk_buff *pktopts = ireq6->pktopts;
260                         struct inet6_skb_parm *rxopt = IP6CB(pktopts);
261
262                         if (rxopt->srcrt)
263                                 opt = ipv6_invert_rthdr(sk,
264                                         (struct ipv6_rt_hdr *)(pktopts->nh.raw +
265                                                                rxopt->srcrt));
266                 }
267
268                 if (opt != NULL && opt->srcrt != NULL) {
269                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
270
271                         ipv6_addr_copy(&final, &fl.fl6_dst);
272                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
273                         final_p = &final;
274                 }
275
276                 err = ip6_dst_lookup(sk, &dst, &fl);
277                 if (err)
278                         goto done;
279
280                 if (final_p)
281                         ipv6_addr_copy(&fl.fl6_dst, final_p);
282
283                 err = xfrm_lookup(&dst, &fl, sk, 0);
284                 if (err < 0)
285                         goto done;
286         }
287
288         skb = dccp_make_response(sk, dst, req);
289         if (skb != NULL) {
290                 struct dccp_hdr *dh = dccp_hdr(skb);
291
292                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
293                                                          &ireq6->loc_addr,
294                                                          &ireq6->rmt_addr);
295                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
296                 err = ip6_xmit(sk, skb, &fl, opt, 0);
297                 err = net_xmit_eval(err);
298         }
299
300 done:
301         if (opt != NULL && opt != np->opt)
302                 sock_kfree_s(sk, opt, opt->tot_len);
303         dst_release(dst);
304         return err;
305 }
306
307 static void dccp_v6_reqsk_destructor(struct request_sock *req)
308 {
309         if (inet6_rsk(req)->pktopts != NULL)
310                 kfree_skb(inet6_rsk(req)->pktopts);
311 }
312
313 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
314 {
315         struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
316         const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
317                                        sizeof(struct dccp_hdr_ext) +
318                                        sizeof(struct dccp_hdr_reset);
319         struct sk_buff *skb;
320         struct flowi fl;
321         u64 seqno = 0;
322
323         if (rxdh->dccph_type == DCCP_PKT_RESET)
324                 return;
325
326         if (!ipv6_unicast_destination(rxskb))
327                 return;
328
329         skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
330                         GFP_ATOMIC);
331         if (skb == NULL)
332                 return;
333
334         skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
335
336         dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len);
337
338         /* Swap the send and the receive. */
339         dh->dccph_type  = DCCP_PKT_RESET;
340         dh->dccph_sport = rxdh->dccph_dport;
341         dh->dccph_dport = rxdh->dccph_sport;
342         dh->dccph_doff  = dccp_hdr_reset_len / 4;
343         dh->dccph_x     = 1;
344         dccp_hdr_reset(skb)->dccph_reset_code =
345                                 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
346
347         /* See "8.3.1. Abnormal Termination" in RFC 4340 */
348         if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
349                 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
350
351         dccp_hdr_set_seq(dh, seqno);
352         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), DCCP_SKB_CB(rxskb)->dccpd_seq);
353
354         dccp_csum_outgoing(skb);
355         dh->dccph_checksum = dccp_v6_csum_finish(skb, &rxskb->nh.ipv6h->saddr,
356                                                       &rxskb->nh.ipv6h->daddr);
357
358         memset(&fl, 0, sizeof(fl));
359         ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
360         ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
361
362         fl.proto = IPPROTO_DCCP;
363         fl.oif = inet6_iif(rxskb);
364         fl.fl_ip_dport = dh->dccph_dport;
365         fl.fl_ip_sport = dh->dccph_sport;
366         security_skb_classify_flow(rxskb, &fl);
367
368         /* sk = NULL, but it is safe for now. RST socket required. */
369         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
370                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
371                         ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
372                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
373                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
374                         return;
375                 }
376         }
377
378         kfree_skb(skb);
379 }
380
381 static struct request_sock_ops dccp6_request_sock_ops = {
382         .family         = AF_INET6,
383         .obj_size       = sizeof(struct dccp6_request_sock),
384         .rtx_syn_ack    = dccp_v6_send_response,
385         .send_ack       = dccp_reqsk_send_ack,
386         .destructor     = dccp_v6_reqsk_destructor,
387         .send_reset     = dccp_v6_ctl_send_reset,
388 };
389
390 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
391 {
392         const struct dccp_hdr *dh = dccp_hdr(skb);
393         const struct ipv6hdr *iph = skb->nh.ipv6h;
394         struct sock *nsk;
395         struct request_sock **prev;
396         /* Find possible connection requests. */
397         struct request_sock *req = inet6_csk_search_req(sk, &prev,
398                                                         dh->dccph_sport,
399                                                         &iph->saddr,
400                                                         &iph->daddr,
401                                                         inet6_iif(skb));
402         if (req != NULL)
403                 return dccp_check_req(sk, skb, req, prev);
404
405         nsk = __inet6_lookup_established(&dccp_hashinfo,
406                                          &iph->saddr, dh->dccph_sport,
407                                          &iph->daddr, ntohs(dh->dccph_dport),
408                                          inet6_iif(skb));
409         if (nsk != NULL) {
410                 if (nsk->sk_state != DCCP_TIME_WAIT) {
411                         bh_lock_sock(nsk);
412                         return nsk;
413                 }
414                 inet_twsk_put(inet_twsk(nsk));
415                 return NULL;
416         }
417
418         return sk;
419 }
420
421 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
422 {
423         struct request_sock *req;
424         struct dccp_request_sock *dreq;
425         struct inet6_request_sock *ireq6;
426         struct ipv6_pinfo *np = inet6_sk(sk);
427         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
428         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
429         __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
430
431         if (skb->protocol == htons(ETH_P_IP))
432                 return dccp_v4_conn_request(sk, skb);
433
434         if (!ipv6_unicast_destination(skb))
435                 goto drop;
436
437         if (dccp_bad_service_code(sk, service)) {
438                 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
439                 goto drop;
440         }
441         /*
442          * There are no SYN attacks on IPv6, yet...
443          */
444         if (inet_csk_reqsk_queue_is_full(sk))
445                 goto drop;
446
447         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
448                 goto drop;
449
450         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
451         if (req == NULL)
452                 goto drop;
453
454         if (dccp_parse_options(sk, skb))
455                 goto drop_and_free;
456
457         dccp_reqsk_init(req, skb);
458
459         if (security_inet_conn_request(sk, skb, req))
460                 goto drop_and_free;
461
462         ireq6 = inet6_rsk(req);
463         ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
464         ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
465         ireq6->pktopts  = NULL;
466
467         if (ipv6_opt_accepted(sk, skb) ||
468             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
469             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
470                 atomic_inc(&skb->users);
471                 ireq6->pktopts = skb;
472         }
473         ireq6->iif = sk->sk_bound_dev_if;
474
475         /* So that link locals have meaning */
476         if (!sk->sk_bound_dev_if &&
477             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
478                 ireq6->iif = inet6_iif(skb);
479
480         /*
481          * Step 3: Process LISTEN state
482          *
483          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
484          *
485          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
486          *   dccp_create_openreq_child.
487          */
488         dreq = dccp_rsk(req);
489         dreq->dreq_isr     = dcb->dccpd_seq;
490         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
491         dreq->dreq_service = service;
492
493         if (dccp_v6_send_response(sk, req, NULL))
494                 goto drop_and_free;
495
496         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
497         return 0;
498
499 drop_and_free:
500         reqsk_free(req);
501 drop:
502         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
503         dcb->dccpd_reset_code = reset_code;
504         return -1;
505 }
506
507 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
508                                               struct sk_buff *skb,
509                                               struct request_sock *req,
510                                               struct dst_entry *dst)
511 {
512         struct inet6_request_sock *ireq6 = inet6_rsk(req);
513         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
514         struct inet_sock *newinet;
515         struct dccp_sock *newdp;
516         struct dccp6_sock *newdp6;
517         struct sock *newsk;
518         struct ipv6_txoptions *opt;
519
520         if (skb->protocol == htons(ETH_P_IP)) {
521                 /*
522                  *      v6 mapped
523                  */
524                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
525                 if (newsk == NULL)
526                         return NULL;
527
528                 newdp6 = (struct dccp6_sock *)newsk;
529                 newdp = dccp_sk(newsk);
530                 newinet = inet_sk(newsk);
531                 newinet->pinet6 = &newdp6->inet6;
532                 newnp = inet6_sk(newsk);
533
534                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
535
536                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
537                               newinet->daddr);
538
539                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
540                               newinet->saddr);
541
542                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
543
544                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
545                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
546                 newnp->pktoptions  = NULL;
547                 newnp->opt         = NULL;
548                 newnp->mcast_oif   = inet6_iif(skb);
549                 newnp->mcast_hops  = skb->nh.ipv6h->hop_limit;
550
551                 /*
552                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
553                  * here, dccp_create_openreq_child now does this for us, see the comment in
554                  * that function for the gory details. -acme
555                  */
556
557                 /* It is tricky place. Until this moment IPv4 tcp
558                    worked with IPv6 icsk.icsk_af_ops.
559                    Sync it now.
560                  */
561                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
562
563                 return newsk;
564         }
565
566         opt = np->opt;
567
568         if (sk_acceptq_is_full(sk))
569                 goto out_overflow;
570
571         if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) {
572                 const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
573
574                 if (rxopt->srcrt)
575                         opt = ipv6_invert_rthdr(sk,
576                                 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
577                                                        rxopt->srcrt));
578         }
579
580         if (dst == NULL) {
581                 struct in6_addr *final_p = NULL, final;
582                 struct flowi fl;
583
584                 memset(&fl, 0, sizeof(fl));
585                 fl.proto = IPPROTO_DCCP;
586                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
587                 if (opt != NULL && opt->srcrt != NULL) {
588                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
589
590                         ipv6_addr_copy(&final, &fl.fl6_dst);
591                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
592                         final_p = &final;
593                 }
594                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
595                 fl.oif = sk->sk_bound_dev_if;
596                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
597                 fl.fl_ip_sport = inet_sk(sk)->sport;
598                 security_sk_classify_flow(sk, &fl);
599
600                 if (ip6_dst_lookup(sk, &dst, &fl))
601                         goto out;
602
603                 if (final_p)
604                         ipv6_addr_copy(&fl.fl6_dst, final_p);
605
606                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
607                         goto out;
608         }
609
610         newsk = dccp_create_openreq_child(sk, req, skb);
611         if (newsk == NULL)
612                 goto out;
613
614         /*
615          * No need to charge this sock to the relevant IPv6 refcnt debug socks
616          * count here, dccp_create_openreq_child now does this for us, see the
617          * comment in that function for the gory details. -acme
618          */
619
620         __ip6_dst_store(newsk, dst, NULL, NULL);
621         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
622                                                       NETIF_F_TSO);
623         newdp6 = (struct dccp6_sock *)newsk;
624         newinet = inet_sk(newsk);
625         newinet->pinet6 = &newdp6->inet6;
626         newdp = dccp_sk(newsk);
627         newnp = inet6_sk(newsk);
628
629         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
630
631         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
632         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
633         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
634         newsk->sk_bound_dev_if = ireq6->iif;
635
636         /* Now IPv6 options...
637
638            First: no IPv4 options.
639          */
640         newinet->opt = NULL;
641
642         /* Clone RX bits */
643         newnp->rxopt.all = np->rxopt.all;
644
645         /* Clone pktoptions received with SYN */
646         newnp->pktoptions = NULL;
647         if (ireq6->pktopts != NULL) {
648                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
649                 kfree_skb(ireq6->pktopts);
650                 ireq6->pktopts = NULL;
651                 if (newnp->pktoptions)
652                         skb_set_owner_r(newnp->pktoptions, newsk);
653         }
654         newnp->opt        = NULL;
655         newnp->mcast_oif  = inet6_iif(skb);
656         newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
657
658         /*
659          * Clone native IPv6 options from listening socket (if any)
660          *
661          * Yes, keeping reference count would be much more clever, but we make
662          * one more one thing there: reattach optmem to newsk.
663          */
664         if (opt != NULL) {
665                 newnp->opt = ipv6_dup_options(newsk, opt);
666                 if (opt != np->opt)
667                         sock_kfree_s(sk, opt, opt->tot_len);
668         }
669
670         inet_csk(newsk)->icsk_ext_hdr_len = 0;
671         if (newnp->opt != NULL)
672                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
673                                                      newnp->opt->opt_flen);
674
675         dccp_sync_mss(newsk, dst_mtu(dst));
676
677         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
678
679         __inet6_hash(&dccp_hashinfo, newsk);
680         inet_inherit_port(&dccp_hashinfo, sk, newsk);
681
682         return newsk;
683
684 out_overflow:
685         NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
686 out:
687         NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
688         if (opt != NULL && opt != np->opt)
689                 sock_kfree_s(sk, opt, opt->tot_len);
690         dst_release(dst);
691         return NULL;
692 }
693
694 /* The socket must have it's spinlock held when we get
695  * here.
696  *
697  * We have a potential double-lock case here, so even when
698  * doing backlog processing we use the BH locking scheme.
699  * This is because we cannot sleep with the original spinlock
700  * held.
701  */
702 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
703 {
704         struct ipv6_pinfo *np = inet6_sk(sk);
705         struct sk_buff *opt_skb = NULL;
706
707         /* Imagine: socket is IPv6. IPv4 packet arrives,
708            goes to IPv4 receive handler and backlogged.
709            From backlog it always goes here. Kerboom...
710            Fortunately, dccp_rcv_established and rcv_established
711            handle them correctly, but it is not case with
712            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
713          */
714
715         if (skb->protocol == htons(ETH_P_IP))
716                 return dccp_v4_do_rcv(sk, skb);
717
718         if (sk_filter(sk, skb))
719                 goto discard;
720
721         /*
722          * socket locking is here for SMP purposes as backlog rcv is currently
723          * called with bh processing disabled.
724          */
725
726         /* Do Stevens' IPV6_PKTOPTIONS.
727
728            Yes, guys, it is the only place in our code, where we
729            may make it not affecting IPv4.
730            The rest of code is protocol independent,
731            and I do not like idea to uglify IPv4.
732
733            Actually, all the idea behind IPV6_PKTOPTIONS
734            looks not very well thought. For now we latch
735            options, received in the last packet, enqueued
736            by tcp. Feel free to propose better solution.
737                                                --ANK (980728)
738          */
739         if (np->rxopt.all)
740         /*
741          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
742          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
743          */
744                 opt_skb = skb_clone(skb, GFP_ATOMIC);
745
746         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
747                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
748                         goto reset;
749                 if (opt_skb) {
750                         /* XXX This is where we would goto ipv6_pktoptions. */
751                         __kfree_skb(opt_skb);
752                 }
753                 return 0;
754         }
755
756         /*
757          *  Step 3: Process LISTEN state
758          *     If S.state == LISTEN,
759          *       If P.type == Request or P contains a valid Init Cookie option,
760          *            (* Must scan the packet's options to check for Init
761          *               Cookies.  Only Init Cookies are processed here,
762          *               however; other options are processed in Step 8.  This
763          *               scan need only be performed if the endpoint uses Init
764          *               Cookies *)
765          *            (* Generate a new socket and switch to that socket *)
766          *            Set S := new socket for this port pair
767          *            S.state = RESPOND
768          *            Choose S.ISS (initial seqno) or set from Init Cookies
769          *            Initialize S.GAR := S.ISS
770          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
771          *            Continue with S.state == RESPOND
772          *            (* A Response packet will be generated in Step 11 *)
773          *       Otherwise,
774          *            Generate Reset(No Connection) unless P.type == Reset
775          *            Drop packet and return
776          *
777          * NOTE: the check for the packet types is done in
778          *       dccp_rcv_state_process
779          */
780         if (sk->sk_state == DCCP_LISTEN) {
781                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
782
783                 if (nsk == NULL)
784                         goto discard;
785                 /*
786                  * Queue it on the new socket if the new socket is active,
787                  * otherwise we just shortcircuit this and continue with
788                  * the new socket..
789                  */
790                 if (nsk != sk) {
791                         if (dccp_child_process(sk, nsk, skb))
792                                 goto reset;
793                         if (opt_skb != NULL)
794                                 __kfree_skb(opt_skb);
795                         return 0;
796                 }
797         }
798
799         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
800                 goto reset;
801         if (opt_skb) {
802                 /* XXX This is where we would goto ipv6_pktoptions. */
803                 __kfree_skb(opt_skb);
804         }
805         return 0;
806
807 reset:
808         dccp_v6_ctl_send_reset(sk, skb);
809 discard:
810         if (opt_skb != NULL)
811                 __kfree_skb(opt_skb);
812         kfree_skb(skb);
813         return 0;
814 }
815
816 static int dccp_v6_rcv(struct sk_buff **pskb)
817 {
818         const struct dccp_hdr *dh;
819         struct sk_buff *skb = *pskb;
820         struct sock *sk;
821         int min_cov;
822
823         /* Step 1: Check header basics */
824
825         if (dccp_invalid_packet(skb))
826                 goto discard_it;
827
828         /* Step 1: If header checksum is incorrect, drop packet and return. */
829         if (dccp_v6_csum_finish(skb, &skb->nh.ipv6h->saddr,
830                                      &skb->nh.ipv6h->daddr)) {
831                 DCCP_WARN("dropped packet with invalid checksum\n");
832                 goto discard_it;
833         }
834
835         dh = dccp_hdr(skb);
836
837         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(skb);
838         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
839
840         if (dccp_packet_without_ack(skb))
841                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
842         else
843                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
844
845         /* Step 2:
846          *      Look up flow ID in table and get corresponding socket */
847         sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
848                             dh->dccph_sport,
849                             &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
850                             inet6_iif(skb));
851         /*
852          * Step 2:
853          *      If no socket ...
854          */
855         if (sk == NULL) {
856                 dccp_pr_debug("failed to look up flow ID in table and "
857                               "get corresponding socket\n");
858                 goto no_dccp_socket;
859         }
860
861         /*
862          * Step 2:
863          *      ... or S.state == TIMEWAIT,
864          *              Generate Reset(No Connection) unless P.type == Reset
865          *              Drop packet and return
866          */
867         if (sk->sk_state == DCCP_TIME_WAIT) {
868                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
869                 inet_twsk_put(inet_twsk(sk));
870                 goto no_dccp_socket;
871         }
872
873         /*
874          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
875          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
876          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
877          */
878         min_cov = dccp_sk(sk)->dccps_pcrlen;
879         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
880                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
881                               dh->dccph_cscov, min_cov);
882                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
883                 goto discard_and_relse;
884         }
885
886         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
887                 goto discard_and_relse;
888
889         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
890
891 no_dccp_socket:
892         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
893                 goto discard_it;
894         /*
895          * Step 2:
896          *      If no socket ...
897          *              Generate Reset(No Connection) unless P.type == Reset
898          *              Drop packet and return
899          */
900         if (dh->dccph_type != DCCP_PKT_RESET) {
901                 DCCP_SKB_CB(skb)->dccpd_reset_code =
902                                         DCCP_RESET_CODE_NO_CONNECTION;
903                 dccp_v6_ctl_send_reset(sk, skb);
904         }
905
906 discard_it:
907         kfree_skb(skb);
908         return 0;
909
910 discard_and_relse:
911         sock_put(sk);
912         goto discard_it;
913 }
914
915 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
916                            int addr_len)
917 {
918         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
919         struct inet_connection_sock *icsk = inet_csk(sk);
920         struct inet_sock *inet = inet_sk(sk);
921         struct ipv6_pinfo *np = inet6_sk(sk);
922         struct dccp_sock *dp = dccp_sk(sk);
923         struct in6_addr *saddr = NULL, *final_p = NULL, final;
924         struct flowi fl;
925         struct dst_entry *dst;
926         int addr_type;
927         int err;
928
929         dp->dccps_role = DCCP_ROLE_CLIENT;
930
931         if (addr_len < SIN6_LEN_RFC2133)
932                 return -EINVAL;
933
934         if (usin->sin6_family != AF_INET6)
935                 return -EAFNOSUPPORT;
936
937         memset(&fl, 0, sizeof(fl));
938
939         if (np->sndflow) {
940                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
941                 IP6_ECN_flow_init(fl.fl6_flowlabel);
942                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
943                         struct ip6_flowlabel *flowlabel;
944                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
945                         if (flowlabel == NULL)
946                                 return -EINVAL;
947                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
948                         fl6_sock_release(flowlabel);
949                 }
950         }
951         /*
952          * connect() to INADDR_ANY means loopback (BSD'ism).
953          */
954         if (ipv6_addr_any(&usin->sin6_addr))
955                 usin->sin6_addr.s6_addr[15] = 1;
956
957         addr_type = ipv6_addr_type(&usin->sin6_addr);
958
959         if (addr_type & IPV6_ADDR_MULTICAST)
960                 return -ENETUNREACH;
961
962         if (addr_type & IPV6_ADDR_LINKLOCAL) {
963                 if (addr_len >= sizeof(struct sockaddr_in6) &&
964                     usin->sin6_scope_id) {
965                         /* If interface is set while binding, indices
966                          * must coincide.
967                          */
968                         if (sk->sk_bound_dev_if &&
969                             sk->sk_bound_dev_if != usin->sin6_scope_id)
970                                 return -EINVAL;
971
972                         sk->sk_bound_dev_if = usin->sin6_scope_id;
973                 }
974
975                 /* Connect to link-local address requires an interface */
976                 if (!sk->sk_bound_dev_if)
977                         return -EINVAL;
978         }
979
980         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
981         np->flow_label = fl.fl6_flowlabel;
982
983         /*
984          * DCCP over IPv4
985          */
986         if (addr_type == IPV6_ADDR_MAPPED) {
987                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
988                 struct sockaddr_in sin;
989
990                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
991
992                 if (__ipv6_only_sock(sk))
993                         return -ENETUNREACH;
994
995                 sin.sin_family = AF_INET;
996                 sin.sin_port = usin->sin6_port;
997                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
998
999                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
1000                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
1001
1002                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
1003                 if (err) {
1004                         icsk->icsk_ext_hdr_len = exthdrlen;
1005                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
1006                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
1007                         goto failure;
1008                 } else {
1009                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
1010                                       inet->saddr);
1011                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
1012                                       inet->rcv_saddr);
1013                 }
1014
1015                 return err;
1016         }
1017
1018         if (!ipv6_addr_any(&np->rcv_saddr))
1019                 saddr = &np->rcv_saddr;
1020
1021         fl.proto = IPPROTO_DCCP;
1022         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
1023         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
1024         fl.oif = sk->sk_bound_dev_if;
1025         fl.fl_ip_dport = usin->sin6_port;
1026         fl.fl_ip_sport = inet->sport;
1027         security_sk_classify_flow(sk, &fl);
1028
1029         if (np->opt != NULL && np->opt->srcrt != NULL) {
1030                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
1031
1032                 ipv6_addr_copy(&final, &fl.fl6_dst);
1033                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1034                 final_p = &final;
1035         }
1036
1037         err = ip6_dst_lookup(sk, &dst, &fl);
1038         if (err)
1039                 goto failure;
1040
1041         if (final_p)
1042                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1043
1044         err = xfrm_lookup(&dst, &fl, sk, 1);
1045         if (err < 0)
1046                 goto failure;
1047
1048         if (saddr == NULL) {
1049                 saddr = &fl.fl6_src;
1050                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1051         }
1052
1053         /* set the source address */
1054         ipv6_addr_copy(&np->saddr, saddr);
1055         inet->rcv_saddr = LOOPBACK4_IPV6;
1056
1057         __ip6_dst_store(sk, dst, NULL, NULL);
1058
1059         icsk->icsk_ext_hdr_len = 0;
1060         if (np->opt != NULL)
1061                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1062                                           np->opt->opt_nflen);
1063
1064         inet->dport = usin->sin6_port;
1065
1066         dccp_set_state(sk, DCCP_REQUESTING);
1067         err = inet6_hash_connect(&dccp_death_row, sk);
1068         if (err)
1069                 goto late_failure;
1070
1071         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1072                                                       np->daddr.s6_addr32,
1073                                                       inet->sport, inet->dport);
1074         err = dccp_connect(sk);
1075         if (err)
1076                 goto late_failure;
1077
1078         return 0;
1079
1080 late_failure:
1081         dccp_set_state(sk, DCCP_CLOSED);
1082         __sk_dst_reset(sk);
1083 failure:
1084         inet->dport = 0;
1085         sk->sk_route_caps = 0;
1086         return err;
1087 }
1088
1089 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1090         .queue_xmit        = inet6_csk_xmit,
1091         .send_check        = dccp_v6_send_check,
1092         .rebuild_header    = inet6_sk_rebuild_header,
1093         .conn_request      = dccp_v6_conn_request,
1094         .syn_recv_sock     = dccp_v6_request_recv_sock,
1095         .net_header_len    = sizeof(struct ipv6hdr),
1096         .setsockopt        = ipv6_setsockopt,
1097         .getsockopt        = ipv6_getsockopt,
1098         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1099         .sockaddr_len      = sizeof(struct sockaddr_in6),
1100 #ifdef CONFIG_COMPAT
1101         .compat_setsockopt = compat_ipv6_setsockopt,
1102         .compat_getsockopt = compat_ipv6_getsockopt,
1103 #endif
1104 };
1105
1106 /*
1107  *      DCCP over IPv4 via INET6 API
1108  */
1109 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1110         .queue_xmit        = ip_queue_xmit,
1111         .send_check        = dccp_v4_send_check,
1112         .rebuild_header    = inet_sk_rebuild_header,
1113         .conn_request      = dccp_v6_conn_request,
1114         .syn_recv_sock     = dccp_v6_request_recv_sock,
1115         .net_header_len    = sizeof(struct iphdr),
1116         .setsockopt        = ipv6_setsockopt,
1117         .getsockopt        = ipv6_getsockopt,
1118         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1119         .sockaddr_len      = sizeof(struct sockaddr_in6),
1120 #ifdef CONFIG_COMPAT
1121         .compat_setsockopt = compat_ipv6_setsockopt,
1122         .compat_getsockopt = compat_ipv6_getsockopt,
1123 #endif
1124 };
1125
1126 /* NOTE: A lot of things set to zero explicitly by call to
1127  *       sk_alloc() so need not be done here.
1128  */
1129 static int dccp_v6_init_sock(struct sock *sk)
1130 {
1131         static __u8 dccp_v6_ctl_sock_initialized;
1132         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1133
1134         if (err == 0) {
1135                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1136                         dccp_v6_ctl_sock_initialized = 1;
1137                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1138         }
1139
1140         return err;
1141 }
1142
1143 static int dccp_v6_destroy_sock(struct sock *sk)
1144 {
1145         dccp_destroy_sock(sk);
1146         return inet6_destroy_sock(sk);
1147 }
1148
1149 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1150         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1151 };
1152
1153 static struct proto dccp_v6_prot = {
1154         .name              = "DCCPv6",
1155         .owner             = THIS_MODULE,
1156         .close             = dccp_close,
1157         .connect           = dccp_v6_connect,
1158         .disconnect        = dccp_disconnect,
1159         .ioctl             = dccp_ioctl,
1160         .init              = dccp_v6_init_sock,
1161         .setsockopt        = dccp_setsockopt,
1162         .getsockopt        = dccp_getsockopt,
1163         .sendmsg           = dccp_sendmsg,
1164         .recvmsg           = dccp_recvmsg,
1165         .backlog_rcv       = dccp_v6_do_rcv,
1166         .hash              = dccp_v6_hash,
1167         .unhash            = dccp_unhash,
1168         .accept            = inet_csk_accept,
1169         .get_port          = dccp_v6_get_port,
1170         .shutdown          = dccp_shutdown,
1171         .destroy           = dccp_v6_destroy_sock,
1172         .orphan_count      = &dccp_orphan_count,
1173         .max_header        = MAX_DCCP_HEADER,
1174         .obj_size          = sizeof(struct dccp6_sock),
1175         .rsk_prot          = &dccp6_request_sock_ops,
1176         .twsk_prot         = &dccp6_timewait_sock_ops,
1177 #ifdef CONFIG_COMPAT
1178         .compat_setsockopt = compat_dccp_setsockopt,
1179         .compat_getsockopt = compat_dccp_getsockopt,
1180 #endif
1181 };
1182
1183 static struct inet6_protocol dccp_v6_protocol = {
1184         .handler        = dccp_v6_rcv,
1185         .err_handler    = dccp_v6_err,
1186         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1187 };
1188
1189 static struct proto_ops inet6_dccp_ops = {
1190         .family            = PF_INET6,
1191         .owner             = THIS_MODULE,
1192         .release           = inet6_release,
1193         .bind              = inet6_bind,
1194         .connect           = inet_stream_connect,
1195         .socketpair        = sock_no_socketpair,
1196         .accept            = inet_accept,
1197         .getname           = inet6_getname,
1198         .poll              = dccp_poll,
1199         .ioctl             = inet6_ioctl,
1200         .listen            = inet_dccp_listen,
1201         .shutdown          = inet_shutdown,
1202         .setsockopt        = sock_common_setsockopt,
1203         .getsockopt        = sock_common_getsockopt,
1204         .sendmsg           = inet_sendmsg,
1205         .recvmsg           = sock_common_recvmsg,
1206         .mmap              = sock_no_mmap,
1207         .sendpage          = sock_no_sendpage,
1208 #ifdef CONFIG_COMPAT
1209         .compat_setsockopt = compat_sock_common_setsockopt,
1210         .compat_getsockopt = compat_sock_common_getsockopt,
1211 #endif
1212 };
1213
1214 static struct inet_protosw dccp_v6_protosw = {
1215         .type           = SOCK_DCCP,
1216         .protocol       = IPPROTO_DCCP,
1217         .prot           = &dccp_v6_prot,
1218         .ops            = &inet6_dccp_ops,
1219         .capability     = -1,
1220         .flags          = INET_PROTOSW_ICSK,
1221 };
1222
1223 static int __init dccp_v6_init(void)
1224 {
1225         int err = proto_register(&dccp_v6_prot, 1);
1226
1227         if (err != 0)
1228                 goto out;
1229
1230         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1231         if (err != 0)
1232                 goto out_unregister_proto;
1233
1234         inet6_register_protosw(&dccp_v6_protosw);
1235
1236         err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1237                                        SOCK_DCCP, IPPROTO_DCCP);
1238         if (err != 0)
1239                 goto out_unregister_protosw;
1240 out:
1241         return err;
1242 out_unregister_protosw:
1243         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1244         inet6_unregister_protosw(&dccp_v6_protosw);
1245 out_unregister_proto:
1246         proto_unregister(&dccp_v6_prot);
1247         goto out;
1248 }
1249
1250 static void __exit dccp_v6_exit(void)
1251 {
1252         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1253         inet6_unregister_protosw(&dccp_v6_protosw);
1254         proto_unregister(&dccp_v6_prot);
1255 }
1256
1257 module_init(dccp_v6_init);
1258 module_exit(dccp_v6_exit);
1259
1260 /*
1261  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1262  * values directly, Also cover the case where the protocol is not specified,
1263  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1264  */
1265 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1266 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1267 MODULE_LICENSE("GPL");
1268 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1269 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");