net: drop capability from protocol definitions
[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 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
37
38 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
39 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
40
41 static 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 /* add pseudo-header to DCCP checksum stored in skb->csum */
55 static 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
62 static 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
72 static 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
78 static 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
87 static 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                 /* icmp should have updated the destination cache entry */
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                         /* BUGGG_FUTURE: Again, it is not clear how
153                            to handle rthdr case. Ignore this complexity
154                            for now.
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->inet_dport;
162                         fl.fl_ip_sport = inet->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                 } /* else let the usual retransmit timer handle it */
182                 dst_release(dst);
183                 goto out;
184         }
185
186         icmpv6_err_convert(type, code, &err);
187
188         /* Might be for an request_sock */
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                  * ICMPs are not backlogged, hence we cannot get an established
203                  * socket here.
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:  /* Cannot happen.
217                                It can, it SYNs are crossed. --ANK */
218                 if (!sock_owned_by_user(sk)) {
219                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
220                         sk->sk_err = err;
221                         /*
222                          * Wake people up to see the error
223                          * (see connect in sock.c)
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
238 out:
239         bh_unlock_sock(sk);
240         sock_put(sk);
241 }
242
243
244 static 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
298 done:
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
305 static 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
312 static 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         /* sk = NULL, but it is safe for now. RST socket required. */
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
359 static 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
368 static 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         /* Find possible connection requests. */
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
399 static 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;       /* discard, don't send a reset here */
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          * There are no SYN attacks on IPv6, yet...
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         /* So that link locals have meaning */
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          * Step 3: Process LISTEN state
461          *
462          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
463          *
464          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
465          *   dccp_create_openreq_child.
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
477 drop_and_free:
478         reqsk_free(req);
479 drop:
480         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
481         return -1;
482 }
483
484 static 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                  *      v6 mapped
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_v4mapped(newinet->inet_daddr, &newnp->daddr);
514
515                 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
516
517                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
518
519                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
520                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
521                 newnp->pktoptions  = NULL;
522                 newnp->opt         = NULL;
523                 newnp->mcast_oif   = inet6_iif(skb);
524                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
525
526                 /*
527                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
528                  * here, dccp_create_openreq_child now does this for us, see the comment in
529                  * that function for the gory details. -acme
530                  */
531
532                 /* It is tricky place. Until this moment IPv4 tcp
533                    worked with IPv6 icsk.icsk_af_ops.
534                    Sync it now.
535                  */
536                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
537
538                 return newsk;
539         }
540
541         opt = np->opt;
542
543         if (sk_acceptq_is_full(sk))
544                 goto out_overflow;
545
546         if (dst == NULL) {
547                 struct in6_addr *final_p = NULL, final;
548                 struct flowi fl;
549
550                 memset(&fl, 0, sizeof(fl));
551                 fl.proto = IPPROTO_DCCP;
552                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
553                 if (opt != NULL && opt->srcrt != NULL) {
554                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
555
556                         ipv6_addr_copy(&final, &fl.fl6_dst);
557                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
558                         final_p = &final;
559                 }
560                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
561                 fl.oif = sk->sk_bound_dev_if;
562                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
563                 fl.fl_ip_sport = inet_rsk(req)->loc_port;
564                 security_sk_classify_flow(sk, &fl);
565
566                 if (ip6_dst_lookup(sk, &dst, &fl))
567                         goto out;
568
569                 if (final_p)
570                         ipv6_addr_copy(&fl.fl6_dst, final_p);
571
572                 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
573                         goto out;
574         }
575
576         newsk = dccp_create_openreq_child(sk, req, skb);
577         if (newsk == NULL)
578                 goto out;
579
580         /*
581          * No need to charge this sock to the relevant IPv6 refcnt debug socks
582          * count here, dccp_create_openreq_child now does this for us, see the
583          * comment in that function for the gory details. -acme
584          */
585
586         __ip6_dst_store(newsk, dst, NULL, NULL);
587         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
588                                                       NETIF_F_TSO);
589         newdp6 = (struct dccp6_sock *)newsk;
590         newinet = inet_sk(newsk);
591         newinet->pinet6 = &newdp6->inet6;
592         newdp = dccp_sk(newsk);
593         newnp = inet6_sk(newsk);
594
595         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
596
597         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
598         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
599         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
600         newsk->sk_bound_dev_if = ireq6->iif;
601
602         /* Now IPv6 options...
603
604            First: no IPv4 options.
605          */
606         newinet->opt = NULL;
607
608         /* Clone RX bits */
609         newnp->rxopt.all = np->rxopt.all;
610
611         /* Clone pktoptions received with SYN */
612         newnp->pktoptions = NULL;
613         if (ireq6->pktopts != NULL) {
614                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
615                 kfree_skb(ireq6->pktopts);
616                 ireq6->pktopts = NULL;
617                 if (newnp->pktoptions)
618                         skb_set_owner_r(newnp->pktoptions, newsk);
619         }
620         newnp->opt        = NULL;
621         newnp->mcast_oif  = inet6_iif(skb);
622         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
623
624         /*
625          * Clone native IPv6 options from listening socket (if any)
626          *
627          * Yes, keeping reference count would be much more clever, but we make
628          * one more one thing there: reattach optmem to newsk.
629          */
630         if (opt != NULL) {
631                 newnp->opt = ipv6_dup_options(newsk, opt);
632                 if (opt != np->opt)
633                         sock_kfree_s(sk, opt, opt->tot_len);
634         }
635
636         inet_csk(newsk)->icsk_ext_hdr_len = 0;
637         if (newnp->opt != NULL)
638                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
639                                                      newnp->opt->opt_flen);
640
641         dccp_sync_mss(newsk, dst_mtu(dst));
642
643         newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
644         newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
645
646         __inet6_hash(newsk);
647         __inet_inherit_port(sk, newsk);
648
649         return newsk;
650
651 out_overflow:
652         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
653 out:
654         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
655         if (opt != NULL && opt != np->opt)
656                 sock_kfree_s(sk, opt, opt->tot_len);
657         dst_release(dst);
658         return NULL;
659 }
660
661 /* The socket must have it's spinlock held when we get
662  * here.
663  *
664  * We have a potential double-lock case here, so even when
665  * doing backlog processing we use the BH locking scheme.
666  * This is because we cannot sleep with the original spinlock
667  * held.
668  */
669 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
670 {
671         struct ipv6_pinfo *np = inet6_sk(sk);
672         struct sk_buff *opt_skb = NULL;
673
674         /* Imagine: socket is IPv6. IPv4 packet arrives,
675            goes to IPv4 receive handler and backlogged.
676            From backlog it always goes here. Kerboom...
677            Fortunately, dccp_rcv_established and rcv_established
678            handle them correctly, but it is not case with
679            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
680          */
681
682         if (skb->protocol == htons(ETH_P_IP))
683                 return dccp_v4_do_rcv(sk, skb);
684
685         if (sk_filter(sk, skb))
686                 goto discard;
687
688         /*
689          * socket locking is here for SMP purposes as backlog rcv is currently
690          * called with bh processing disabled.
691          */
692
693         /* Do Stevens' IPV6_PKTOPTIONS.
694
695            Yes, guys, it is the only place in our code, where we
696            may make it not affecting IPv4.
697            The rest of code is protocol independent,
698            and I do not like idea to uglify IPv4.
699
700            Actually, all the idea behind IPV6_PKTOPTIONS
701            looks not very well thought. For now we latch
702            options, received in the last packet, enqueued
703            by tcp. Feel free to propose better solution.
704                                                --ANK (980728)
705          */
706         if (np->rxopt.all)
707         /*
708          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
709          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
710          */
711                 opt_skb = skb_clone(skb, GFP_ATOMIC);
712
713         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
714                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
715                         goto reset;
716                 if (opt_skb) {
717                         /* XXX This is where we would goto ipv6_pktoptions. */
718                         __kfree_skb(opt_skb);
719                 }
720                 return 0;
721         }
722
723         /*
724          *  Step 3: Process LISTEN state
725          *     If S.state == LISTEN,
726          *       If P.type == Request or P contains a valid Init Cookie option,
727          *            (* Must scan the packet's options to check for Init
728          *               Cookies.  Only Init Cookies are processed here,
729          *               however; other options are processed in Step 8.  This
730          *               scan need only be performed if the endpoint uses Init
731          *               Cookies *)
732          *            (* Generate a new socket and switch to that socket *)
733          *            Set S := new socket for this port pair
734          *            S.state = RESPOND
735          *            Choose S.ISS (initial seqno) or set from Init Cookies
736          *            Initialize S.GAR := S.ISS
737          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
738          *            Continue with S.state == RESPOND
739          *            (* A Response packet will be generated in Step 11 *)
740          *       Otherwise,
741          *            Generate Reset(No Connection) unless P.type == Reset
742          *            Drop packet and return
743          *
744          * NOTE: the check for the packet types is done in
745          *       dccp_rcv_state_process
746          */
747         if (sk->sk_state == DCCP_LISTEN) {
748                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
749
750                 if (nsk == NULL)
751                         goto discard;
752                 /*
753                  * Queue it on the new socket if the new socket is active,
754                  * otherwise we just shortcircuit this and continue with
755                  * the new socket..
756                  */
757                 if (nsk != sk) {
758                         if (dccp_child_process(sk, nsk, skb))
759                                 goto reset;
760                         if (opt_skb != NULL)
761                                 __kfree_skb(opt_skb);
762                         return 0;
763                 }
764         }
765
766         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
767                 goto reset;
768         if (opt_skb) {
769                 /* XXX This is where we would goto ipv6_pktoptions. */
770                 __kfree_skb(opt_skb);
771         }
772         return 0;
773
774 reset:
775         dccp_v6_ctl_send_reset(sk, skb);
776 discard:
777         if (opt_skb != NULL)
778                 __kfree_skb(opt_skb);
779         kfree_skb(skb);
780         return 0;
781 }
782
783 static int dccp_v6_rcv(struct sk_buff *skb)
784 {
785         const struct dccp_hdr *dh;
786         struct sock *sk;
787         int min_cov;
788
789         /* Step 1: Check header basics */
790
791         if (dccp_invalid_packet(skb))
792                 goto discard_it;
793
794         /* Step 1: If header checksum is incorrect, drop packet and return. */
795         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
796                                      &ipv6_hdr(skb)->daddr)) {
797                 DCCP_WARN("dropped packet with invalid checksum\n");
798                 goto discard_it;
799         }
800
801         dh = dccp_hdr(skb);
802
803         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
804         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
805
806         if (dccp_packet_without_ack(skb))
807                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
808         else
809                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
810
811         /* Step 2:
812          *      Look up flow ID in table and get corresponding socket */
813         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
814                                 dh->dccph_sport, dh->dccph_dport);
815         /*
816          * Step 2:
817          *      If no socket ...
818          */
819         if (sk == NULL) {
820                 dccp_pr_debug("failed to look up flow ID in table and "
821                               "get corresponding socket\n");
822                 goto no_dccp_socket;
823         }
824
825         /*
826          * Step 2:
827          *      ... or S.state == TIMEWAIT,
828          *              Generate Reset(No Connection) unless P.type == Reset
829          *              Drop packet and return
830          */
831         if (sk->sk_state == DCCP_TIME_WAIT) {
832                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
833                 inet_twsk_put(inet_twsk(sk));
834                 goto no_dccp_socket;
835         }
836
837         /*
838          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
839          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
840          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
841          */
842         min_cov = dccp_sk(sk)->dccps_pcrlen;
843         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
844                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
845                               dh->dccph_cscov, min_cov);
846                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
847                 goto discard_and_relse;
848         }
849
850         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
851                 goto discard_and_relse;
852
853         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
854
855 no_dccp_socket:
856         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
857                 goto discard_it;
858         /*
859          * Step 2:
860          *      If no socket ...
861          *              Generate Reset(No Connection) unless P.type == Reset
862          *              Drop packet and return
863          */
864         if (dh->dccph_type != DCCP_PKT_RESET) {
865                 DCCP_SKB_CB(skb)->dccpd_reset_code =
866                                         DCCP_RESET_CODE_NO_CONNECTION;
867                 dccp_v6_ctl_send_reset(sk, skb);
868         }
869
870 discard_it:
871         kfree_skb(skb);
872         return 0;
873
874 discard_and_relse:
875         sock_put(sk);
876         goto discard_it;
877 }
878
879 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
880                            int addr_len)
881 {
882         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
883         struct inet_connection_sock *icsk = inet_csk(sk);
884         struct inet_sock *inet = inet_sk(sk);
885         struct ipv6_pinfo *np = inet6_sk(sk);
886         struct dccp_sock *dp = dccp_sk(sk);
887         struct in6_addr *saddr = NULL, *final_p = NULL, final;
888         struct flowi fl;
889         struct dst_entry *dst;
890         int addr_type;
891         int err;
892
893         dp->dccps_role = DCCP_ROLE_CLIENT;
894
895         if (addr_len < SIN6_LEN_RFC2133)
896                 return -EINVAL;
897
898         if (usin->sin6_family != AF_INET6)
899                 return -EAFNOSUPPORT;
900
901         memset(&fl, 0, sizeof(fl));
902
903         if (np->sndflow) {
904                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
905                 IP6_ECN_flow_init(fl.fl6_flowlabel);
906                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
907                         struct ip6_flowlabel *flowlabel;
908                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
909                         if (flowlabel == NULL)
910                                 return -EINVAL;
911                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
912                         fl6_sock_release(flowlabel);
913                 }
914         }
915         /*
916          * connect() to INADDR_ANY means loopback (BSD'ism).
917          */
918         if (ipv6_addr_any(&usin->sin6_addr))
919                 usin->sin6_addr.s6_addr[15] = 1;
920
921         addr_type = ipv6_addr_type(&usin->sin6_addr);
922
923         if (addr_type & IPV6_ADDR_MULTICAST)
924                 return -ENETUNREACH;
925
926         if (addr_type & IPV6_ADDR_LINKLOCAL) {
927                 if (addr_len >= sizeof(struct sockaddr_in6) &&
928                     usin->sin6_scope_id) {
929                         /* If interface is set while binding, indices
930                          * must coincide.
931                          */
932                         if (sk->sk_bound_dev_if &&
933                             sk->sk_bound_dev_if != usin->sin6_scope_id)
934                                 return -EINVAL;
935
936                         sk->sk_bound_dev_if = usin->sin6_scope_id;
937                 }
938
939                 /* Connect to link-local address requires an interface */
940                 if (!sk->sk_bound_dev_if)
941                         return -EINVAL;
942         }
943
944         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
945         np->flow_label = fl.fl6_flowlabel;
946
947         /*
948          * DCCP over IPv4
949          */
950         if (addr_type == IPV6_ADDR_MAPPED) {
951                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
952                 struct sockaddr_in sin;
953
954                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
955
956                 if (__ipv6_only_sock(sk))
957                         return -ENETUNREACH;
958
959                 sin.sin_family = AF_INET;
960                 sin.sin_port = usin->sin6_port;
961                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
962
963                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
964                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
965
966                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
967                 if (err) {
968                         icsk->icsk_ext_hdr_len = exthdrlen;
969                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
970                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
971                         goto failure;
972                 }
973                 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
974                 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
975
976                 return err;
977         }
978
979         if (!ipv6_addr_any(&np->rcv_saddr))
980                 saddr = &np->rcv_saddr;
981
982         fl.proto = IPPROTO_DCCP;
983         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
984         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
985         fl.oif = sk->sk_bound_dev_if;
986         fl.fl_ip_dport = usin->sin6_port;
987         fl.fl_ip_sport = inet->inet_sport;
988         security_sk_classify_flow(sk, &fl);
989
990         if (np->opt != NULL && np->opt->srcrt != NULL) {
991                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
992
993                 ipv6_addr_copy(&final, &fl.fl6_dst);
994                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
995                 final_p = &final;
996         }
997
998         err = ip6_dst_lookup(sk, &dst, &fl);
999         if (err)
1000                 goto failure;
1001
1002         if (final_p)
1003                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1004
1005         err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1006         if (err < 0) {
1007                 if (err == -EREMOTE)
1008                         err = ip6_dst_blackhole(sk, &dst, &fl);
1009                 if (err < 0)
1010                         goto failure;
1011         }
1012
1013         if (saddr == NULL) {
1014                 saddr = &fl.fl6_src;
1015                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1016         }
1017
1018         /* set the source address */
1019         ipv6_addr_copy(&np->saddr, saddr);
1020         inet->inet_rcv_saddr = LOOPBACK4_IPV6;
1021
1022         __ip6_dst_store(sk, dst, NULL, NULL);
1023
1024         icsk->icsk_ext_hdr_len = 0;
1025         if (np->opt != NULL)
1026                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1027                                           np->opt->opt_nflen);
1028
1029         inet->inet_dport = usin->sin6_port;
1030
1031         dccp_set_state(sk, DCCP_REQUESTING);
1032         err = inet6_hash_connect(&dccp_death_row, sk);
1033         if (err)
1034                 goto late_failure;
1035
1036         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1037                                                       np->daddr.s6_addr32,
1038                                                       inet->inet_sport,
1039                                                       inet->inet_dport);
1040         err = dccp_connect(sk);
1041         if (err)
1042                 goto late_failure;
1043
1044         return 0;
1045
1046 late_failure:
1047         dccp_set_state(sk, DCCP_CLOSED);
1048         __sk_dst_reset(sk);
1049 failure:
1050         inet->inet_dport = 0;
1051         sk->sk_route_caps = 0;
1052         return err;
1053 }
1054
1055 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1056         .queue_xmit        = inet6_csk_xmit,
1057         .send_check        = dccp_v6_send_check,
1058         .rebuild_header    = inet6_sk_rebuild_header,
1059         .conn_request      = dccp_v6_conn_request,
1060         .syn_recv_sock     = dccp_v6_request_recv_sock,
1061         .net_header_len    = sizeof(struct ipv6hdr),
1062         .setsockopt        = ipv6_setsockopt,
1063         .getsockopt        = ipv6_getsockopt,
1064         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1065         .sockaddr_len      = sizeof(struct sockaddr_in6),
1066         .bind_conflict     = inet6_csk_bind_conflict,
1067 #ifdef CONFIG_COMPAT
1068         .compat_setsockopt = compat_ipv6_setsockopt,
1069         .compat_getsockopt = compat_ipv6_getsockopt,
1070 #endif
1071 };
1072
1073 /*
1074  *      DCCP over IPv4 via INET6 API
1075  */
1076 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1077         .queue_xmit        = ip_queue_xmit,
1078         .send_check        = dccp_v4_send_check,
1079         .rebuild_header    = inet_sk_rebuild_header,
1080         .conn_request      = dccp_v6_conn_request,
1081         .syn_recv_sock     = dccp_v6_request_recv_sock,
1082         .net_header_len    = sizeof(struct iphdr),
1083         .setsockopt        = ipv6_setsockopt,
1084         .getsockopt        = ipv6_getsockopt,
1085         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1086         .sockaddr_len      = sizeof(struct sockaddr_in6),
1087 #ifdef CONFIG_COMPAT
1088         .compat_setsockopt = compat_ipv6_setsockopt,
1089         .compat_getsockopt = compat_ipv6_getsockopt,
1090 #endif
1091 };
1092
1093 /* NOTE: A lot of things set to zero explicitly by call to
1094  *       sk_alloc() so need not be done here.
1095  */
1096 static int dccp_v6_init_sock(struct sock *sk)
1097 {
1098         static __u8 dccp_v6_ctl_sock_initialized;
1099         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1100
1101         if (err == 0) {
1102                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1103                         dccp_v6_ctl_sock_initialized = 1;
1104                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1105         }
1106
1107         return err;
1108 }
1109
1110 static void dccp_v6_destroy_sock(struct sock *sk)
1111 {
1112         dccp_destroy_sock(sk);
1113         inet6_destroy_sock(sk);
1114 }
1115
1116 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1117         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1118 };
1119
1120 static struct proto dccp_v6_prot = {
1121         .name              = "DCCPv6",
1122         .owner             = THIS_MODULE,
1123         .close             = dccp_close,
1124         .connect           = dccp_v6_connect,
1125         .disconnect        = dccp_disconnect,
1126         .ioctl             = dccp_ioctl,
1127         .init              = dccp_v6_init_sock,
1128         .setsockopt        = dccp_setsockopt,
1129         .getsockopt        = dccp_getsockopt,
1130         .sendmsg           = dccp_sendmsg,
1131         .recvmsg           = dccp_recvmsg,
1132         .backlog_rcv       = dccp_v6_do_rcv,
1133         .hash              = dccp_v6_hash,
1134         .unhash            = inet_unhash,
1135         .accept            = inet_csk_accept,
1136         .get_port          = inet_csk_get_port,
1137         .shutdown          = dccp_shutdown,
1138         .destroy           = dccp_v6_destroy_sock,
1139         .orphan_count      = &dccp_orphan_count,
1140         .max_header        = MAX_DCCP_HEADER,
1141         .obj_size          = sizeof(struct dccp6_sock),
1142         .slab_flags        = SLAB_DESTROY_BY_RCU,
1143         .rsk_prot          = &dccp6_request_sock_ops,
1144         .twsk_prot         = &dccp6_timewait_sock_ops,
1145         .h.hashinfo        = &dccp_hashinfo,
1146 #ifdef CONFIG_COMPAT
1147         .compat_setsockopt = compat_dccp_setsockopt,
1148         .compat_getsockopt = compat_dccp_getsockopt,
1149 #endif
1150 };
1151
1152 static const struct inet6_protocol dccp_v6_protocol = {
1153         .handler        = dccp_v6_rcv,
1154         .err_handler    = dccp_v6_err,
1155         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1156 };
1157
1158 static const struct proto_ops inet6_dccp_ops = {
1159         .family            = PF_INET6,
1160         .owner             = THIS_MODULE,
1161         .release           = inet6_release,
1162         .bind              = inet6_bind,
1163         .connect           = inet_stream_connect,
1164         .socketpair        = sock_no_socketpair,
1165         .accept            = inet_accept,
1166         .getname           = inet6_getname,
1167         .poll              = dccp_poll,
1168         .ioctl             = inet6_ioctl,
1169         .listen            = inet_dccp_listen,
1170         .shutdown          = inet_shutdown,
1171         .setsockopt        = sock_common_setsockopt,
1172         .getsockopt        = sock_common_getsockopt,
1173         .sendmsg           = inet_sendmsg,
1174         .recvmsg           = sock_common_recvmsg,
1175         .mmap              = sock_no_mmap,
1176         .sendpage          = sock_no_sendpage,
1177 #ifdef CONFIG_COMPAT
1178         .compat_setsockopt = compat_sock_common_setsockopt,
1179         .compat_getsockopt = compat_sock_common_getsockopt,
1180 #endif
1181 };
1182
1183 static struct inet_protosw dccp_v6_protosw = {
1184         .type           = SOCK_DCCP,
1185         .protocol       = IPPROTO_DCCP,
1186         .prot           = &dccp_v6_prot,
1187         .ops            = &inet6_dccp_ops,
1188         .flags          = INET_PROTOSW_ICSK,
1189 };
1190
1191 static int dccp_v6_init_net(struct net *net)
1192 {
1193         int err;
1194
1195         err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1196                                    SOCK_DCCP, IPPROTO_DCCP, net);
1197         return err;
1198 }
1199
1200 static void dccp_v6_exit_net(struct net *net)
1201 {
1202         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1203 }
1204
1205 static struct pernet_operations dccp_v6_ops = {
1206         .init   = dccp_v6_init_net,
1207         .exit   = dccp_v6_exit_net,
1208 };
1209
1210 static int __init dccp_v6_init(void)
1211 {
1212         int err = proto_register(&dccp_v6_prot, 1);
1213
1214         if (err != 0)
1215                 goto out;
1216
1217         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1218         if (err != 0)
1219                 goto out_unregister_proto;
1220
1221         inet6_register_protosw(&dccp_v6_protosw);
1222
1223         err = register_pernet_subsys(&dccp_v6_ops);
1224         if (err != 0)
1225                 goto out_destroy_ctl_sock;
1226 out:
1227         return err;
1228
1229 out_destroy_ctl_sock:
1230         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1231         inet6_unregister_protosw(&dccp_v6_protosw);
1232 out_unregister_proto:
1233         proto_unregister(&dccp_v6_prot);
1234         goto out;
1235 }
1236
1237 static void __exit dccp_v6_exit(void)
1238 {
1239         unregister_pernet_subsys(&dccp_v6_ops);
1240         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1241         inet6_unregister_protosw(&dccp_v6_protosw);
1242         proto_unregister(&dccp_v6_prot);
1243 }
1244
1245 module_init(dccp_v6_init);
1246 module_exit(dccp_v6_exit);
1247
1248 /*
1249  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1250  * values directly, Also cover the case where the protocol is not specified,
1251  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1252  */
1253 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1254 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1255 MODULE_LICENSE("GPL");
1256 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1257 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");