tcp: Fix a connect() race with timewait sockets
[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, NULL);
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                                  struct request_values *rv_unused)
246 {
247         struct inet6_request_sock *ireq6 = inet6_rsk(req);
248         struct ipv6_pinfo *np = inet6_sk(sk);
249         struct sk_buff *skb;
250         struct ipv6_txoptions *opt = NULL;
251         struct in6_addr *final_p = NULL, final;
252         struct flowi fl;
253         int err = -1;
254         struct dst_entry *dst;
255
256         memset(&fl, 0, sizeof(fl));
257         fl.proto = IPPROTO_DCCP;
258         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
259         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
260         fl.fl6_flowlabel = 0;
261         fl.oif = ireq6->iif;
262         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
263         fl.fl_ip_sport = inet_rsk(req)->loc_port;
264         security_req_classify_flow(req, &fl);
265
266         opt = np->opt;
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(sock_net(sk), &dst, &fl, sk, 0);
284         if (err < 0)
285                 goto done;
286
287         skb = dccp_make_response(sk, dst, req);
288         if (skb != NULL) {
289                 struct dccp_hdr *dh = dccp_hdr(skb);
290
291                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
292                                                          &ireq6->loc_addr,
293                                                          &ireq6->rmt_addr);
294                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
295                 err = ip6_xmit(sk, skb, &fl, opt, 0);
296                 err = net_xmit_eval(err);
297         }
298
299 done:
300         if (opt != NULL && opt != np->opt)
301                 sock_kfree_s(sk, opt, opt->tot_len);
302         dst_release(dst);
303         return err;
304 }
305
306 static void dccp_v6_reqsk_destructor(struct request_sock *req)
307 {
308         dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
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 ipv6hdr *rxip6h;
316         struct sk_buff *skb;
317         struct flowi fl;
318         struct net *net = dev_net(skb_dst(rxskb)->dev);
319         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
320         struct dst_entry *dst;
321
322         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
323                 return;
324
325         if (!ipv6_unicast_destination(rxskb))
326                 return;
327
328         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
329         if (skb == NULL)
330                 return;
331
332         rxip6h = ipv6_hdr(rxskb);
333         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
334                                                             &rxip6h->daddr);
335
336         memset(&fl, 0, sizeof(fl));
337         ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
338         ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
339
340         fl.proto = IPPROTO_DCCP;
341         fl.oif = inet6_iif(rxskb);
342         fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
343         fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
344         security_skb_classify_flow(rxskb, &fl);
345
346         /* sk = NULL, but it is safe for now. RST socket required. */
347         if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
348                 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
349                         skb_dst_set(skb, dst);
350                         ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
351                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
352                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
353                         return;
354                 }
355         }
356
357         kfree_skb(skb);
358 }
359
360 static struct request_sock_ops dccp6_request_sock_ops = {
361         .family         = AF_INET6,
362         .obj_size       = sizeof(struct dccp6_request_sock),
363         .rtx_syn_ack    = dccp_v6_send_response,
364         .send_ack       = dccp_reqsk_send_ack,
365         .destructor     = dccp_v6_reqsk_destructor,
366         .send_reset     = dccp_v6_ctl_send_reset,
367 };
368
369 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
370 {
371         const struct dccp_hdr *dh = dccp_hdr(skb);
372         const struct ipv6hdr *iph = ipv6_hdr(skb);
373         struct sock *nsk;
374         struct request_sock **prev;
375         /* Find possible connection requests. */
376         struct request_sock *req = inet6_csk_search_req(sk, &prev,
377                                                         dh->dccph_sport,
378                                                         &iph->saddr,
379                                                         &iph->daddr,
380                                                         inet6_iif(skb));
381         if (req != NULL)
382                 return dccp_check_req(sk, skb, req, prev);
383
384         nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
385                                          &iph->saddr, dh->dccph_sport,
386                                          &iph->daddr, ntohs(dh->dccph_dport),
387                                          inet6_iif(skb));
388         if (nsk != NULL) {
389                 if (nsk->sk_state != DCCP_TIME_WAIT) {
390                         bh_lock_sock(nsk);
391                         return nsk;
392                 }
393                 inet_twsk_put(inet_twsk(nsk));
394                 return NULL;
395         }
396
397         return sk;
398 }
399
400 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
401 {
402         struct request_sock *req;
403         struct dccp_request_sock *dreq;
404         struct inet6_request_sock *ireq6;
405         struct ipv6_pinfo *np = inet6_sk(sk);
406         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
407         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
408
409         if (skb->protocol == htons(ETH_P_IP))
410                 return dccp_v4_conn_request(sk, skb);
411
412         if (!ipv6_unicast_destination(skb))
413                 return 0;       /* discard, don't send a reset here */
414
415         if (dccp_bad_service_code(sk, service)) {
416                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
417                 goto drop;
418         }
419         /*
420          * There are no SYN attacks on IPv6, yet...
421          */
422         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
423         if (inet_csk_reqsk_queue_is_full(sk))
424                 goto drop;
425
426         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
427                 goto drop;
428
429         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
430         if (req == NULL)
431                 goto drop;
432
433         if (dccp_reqsk_init(req, dccp_sk(sk), skb))
434                 goto drop_and_free;
435
436         dreq = dccp_rsk(req);
437         if (dccp_parse_options(sk, dreq, skb))
438                 goto drop_and_free;
439
440         if (security_inet_conn_request(sk, skb, req))
441                 goto drop_and_free;
442
443         ireq6 = inet6_rsk(req);
444         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
445         ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
446
447         if (ipv6_opt_accepted(sk, skb) ||
448             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
449             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
450                 atomic_inc(&skb->users);
451                 ireq6->pktopts = skb;
452         }
453         ireq6->iif = sk->sk_bound_dev_if;
454
455         /* So that link locals have meaning */
456         if (!sk->sk_bound_dev_if &&
457             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
458                 ireq6->iif = inet6_iif(skb);
459
460         /*
461          * Step 3: Process LISTEN state
462          *
463          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
464          *
465          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
466          *   dccp_create_openreq_child.
467          */
468         dreq->dreq_isr     = dcb->dccpd_seq;
469         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
470         dreq->dreq_service = service;
471
472         if (dccp_v6_send_response(sk, req, NULL))
473                 goto drop_and_free;
474
475         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
476         return 0;
477
478 drop_and_free:
479         reqsk_free(req);
480 drop:
481         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
482         return -1;
483 }
484
485 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
486                                               struct sk_buff *skb,
487                                               struct request_sock *req,
488                                               struct dst_entry *dst)
489 {
490         struct inet6_request_sock *ireq6 = inet6_rsk(req);
491         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
492         struct inet_sock *newinet;
493         struct dccp_sock *newdp;
494         struct dccp6_sock *newdp6;
495         struct sock *newsk;
496         struct ipv6_txoptions *opt;
497
498         if (skb->protocol == htons(ETH_P_IP)) {
499                 /*
500                  *      v6 mapped
501                  */
502                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
503                 if (newsk == NULL)
504                         return NULL;
505
506                 newdp6 = (struct dccp6_sock *)newsk;
507                 newdp = dccp_sk(newsk);
508                 newinet = inet_sk(newsk);
509                 newinet->pinet6 = &newdp6->inet6;
510                 newnp = inet6_sk(newsk);
511
512                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
513
514                 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
515
516                 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
517
518                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
519
520                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
521                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
522                 newnp->pktoptions  = NULL;
523                 newnp->opt         = NULL;
524                 newnp->mcast_oif   = inet6_iif(skb);
525                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
526
527                 /*
528                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
529                  * here, dccp_create_openreq_child now does this for us, see the comment in
530                  * that function for the gory details. -acme
531                  */
532
533                 /* It is tricky place. Until this moment IPv4 tcp
534                    worked with IPv6 icsk.icsk_af_ops.
535                    Sync it now.
536                  */
537                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
538
539                 return newsk;
540         }
541
542         opt = np->opt;
543
544         if (sk_acceptq_is_full(sk))
545                 goto out_overflow;
546
547         if (dst == NULL) {
548                 struct in6_addr *final_p = NULL, final;
549                 struct flowi fl;
550
551                 memset(&fl, 0, sizeof(fl));
552                 fl.proto = IPPROTO_DCCP;
553                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
554                 if (opt != NULL && opt->srcrt != NULL) {
555                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
556
557                         ipv6_addr_copy(&final, &fl.fl6_dst);
558                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
559                         final_p = &final;
560                 }
561                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
562                 fl.oif = sk->sk_bound_dev_if;
563                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
564                 fl.fl_ip_sport = inet_rsk(req)->loc_port;
565                 security_sk_classify_flow(sk, &fl);
566
567                 if (ip6_dst_lookup(sk, &dst, &fl))
568                         goto out;
569
570                 if (final_p)
571                         ipv6_addr_copy(&fl.fl6_dst, final_p);
572
573                 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
574                         goto out;
575         }
576
577         newsk = dccp_create_openreq_child(sk, req, skb);
578         if (newsk == NULL)
579                 goto out;
580
581         /*
582          * No need to charge this sock to the relevant IPv6 refcnt debug socks
583          * count here, dccp_create_openreq_child now does this for us, see the
584          * comment in that function for the gory details. -acme
585          */
586
587         __ip6_dst_store(newsk, dst, NULL, NULL);
588         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
589                                                       NETIF_F_TSO);
590         newdp6 = (struct dccp6_sock *)newsk;
591         newinet = inet_sk(newsk);
592         newinet->pinet6 = &newdp6->inet6;
593         newdp = dccp_sk(newsk);
594         newnp = inet6_sk(newsk);
595
596         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
597
598         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
599         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
600         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
601         newsk->sk_bound_dev_if = ireq6->iif;
602
603         /* Now IPv6 options...
604
605            First: no IPv4 options.
606          */
607         newinet->opt = NULL;
608
609         /* Clone RX bits */
610         newnp->rxopt.all = np->rxopt.all;
611
612         /* Clone pktoptions received with SYN */
613         newnp->pktoptions = NULL;
614         if (ireq6->pktopts != NULL) {
615                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
616                 kfree_skb(ireq6->pktopts);
617                 ireq6->pktopts = NULL;
618                 if (newnp->pktoptions)
619                         skb_set_owner_r(newnp->pktoptions, newsk);
620         }
621         newnp->opt        = NULL;
622         newnp->mcast_oif  = inet6_iif(skb);
623         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
624
625         /*
626          * Clone native IPv6 options from listening socket (if any)
627          *
628          * Yes, keeping reference count would be much more clever, but we make
629          * one more one thing there: reattach optmem to newsk.
630          */
631         if (opt != NULL) {
632                 newnp->opt = ipv6_dup_options(newsk, opt);
633                 if (opt != np->opt)
634                         sock_kfree_s(sk, opt, opt->tot_len);
635         }
636
637         inet_csk(newsk)->icsk_ext_hdr_len = 0;
638         if (newnp->opt != NULL)
639                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
640                                                      newnp->opt->opt_flen);
641
642         dccp_sync_mss(newsk, dst_mtu(dst));
643
644         newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
645         newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
646
647         __inet6_hash(newsk, NULL);
648         __inet_inherit_port(sk, newsk);
649
650         return newsk;
651
652 out_overflow:
653         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
654 out:
655         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
656         if (opt != NULL && opt != np->opt)
657                 sock_kfree_s(sk, opt, opt->tot_len);
658         dst_release(dst);
659         return NULL;
660 }
661
662 /* The socket must have it's spinlock held when we get
663  * here.
664  *
665  * We have a potential double-lock case here, so even when
666  * doing backlog processing we use the BH locking scheme.
667  * This is because we cannot sleep with the original spinlock
668  * held.
669  */
670 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
671 {
672         struct ipv6_pinfo *np = inet6_sk(sk);
673         struct sk_buff *opt_skb = NULL;
674
675         /* Imagine: socket is IPv6. IPv4 packet arrives,
676            goes to IPv4 receive handler and backlogged.
677            From backlog it always goes here. Kerboom...
678            Fortunately, dccp_rcv_established and rcv_established
679            handle them correctly, but it is not case with
680            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
681          */
682
683         if (skb->protocol == htons(ETH_P_IP))
684                 return dccp_v4_do_rcv(sk, skb);
685
686         if (sk_filter(sk, skb))
687                 goto discard;
688
689         /*
690          * socket locking is here for SMP purposes as backlog rcv is currently
691          * called with bh processing disabled.
692          */
693
694         /* Do Stevens' IPV6_PKTOPTIONS.
695
696            Yes, guys, it is the only place in our code, where we
697            may make it not affecting IPv4.
698            The rest of code is protocol independent,
699            and I do not like idea to uglify IPv4.
700
701            Actually, all the idea behind IPV6_PKTOPTIONS
702            looks not very well thought. For now we latch
703            options, received in the last packet, enqueued
704            by tcp. Feel free to propose better solution.
705                                                --ANK (980728)
706          */
707         if (np->rxopt.all)
708         /*
709          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
710          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
711          */
712                 opt_skb = skb_clone(skb, GFP_ATOMIC);
713
714         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
715                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
716                         goto reset;
717                 if (opt_skb) {
718                         /* XXX This is where we would goto ipv6_pktoptions. */
719                         __kfree_skb(opt_skb);
720                 }
721                 return 0;
722         }
723
724         /*
725          *  Step 3: Process LISTEN state
726          *     If S.state == LISTEN,
727          *       If P.type == Request or P contains a valid Init Cookie option,
728          *            (* Must scan the packet's options to check for Init
729          *               Cookies.  Only Init Cookies are processed here,
730          *               however; other options are processed in Step 8.  This
731          *               scan need only be performed if the endpoint uses Init
732          *               Cookies *)
733          *            (* Generate a new socket and switch to that socket *)
734          *            Set S := new socket for this port pair
735          *            S.state = RESPOND
736          *            Choose S.ISS (initial seqno) or set from Init Cookies
737          *            Initialize S.GAR := S.ISS
738          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
739          *            Continue with S.state == RESPOND
740          *            (* A Response packet will be generated in Step 11 *)
741          *       Otherwise,
742          *            Generate Reset(No Connection) unless P.type == Reset
743          *            Drop packet and return
744          *
745          * NOTE: the check for the packet types is done in
746          *       dccp_rcv_state_process
747          */
748         if (sk->sk_state == DCCP_LISTEN) {
749                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
750
751                 if (nsk == NULL)
752                         goto discard;
753                 /*
754                  * Queue it on the new socket if the new socket is active,
755                  * otherwise we just shortcircuit this and continue with
756                  * the new socket..
757                  */
758                 if (nsk != sk) {
759                         if (dccp_child_process(sk, nsk, skb))
760                                 goto reset;
761                         if (opt_skb != NULL)
762                                 __kfree_skb(opt_skb);
763                         return 0;
764                 }
765         }
766
767         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
768                 goto reset;
769         if (opt_skb) {
770                 /* XXX This is where we would goto ipv6_pktoptions. */
771                 __kfree_skb(opt_skb);
772         }
773         return 0;
774
775 reset:
776         dccp_v6_ctl_send_reset(sk, skb);
777 discard:
778         if (opt_skb != NULL)
779                 __kfree_skb(opt_skb);
780         kfree_skb(skb);
781         return 0;
782 }
783
784 static int dccp_v6_rcv(struct sk_buff *skb)
785 {
786         const struct dccp_hdr *dh;
787         struct sock *sk;
788         int min_cov;
789
790         /* Step 1: Check header basics */
791
792         if (dccp_invalid_packet(skb))
793                 goto discard_it;
794
795         /* Step 1: If header checksum is incorrect, drop packet and return. */
796         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
797                                      &ipv6_hdr(skb)->daddr)) {
798                 DCCP_WARN("dropped packet with invalid checksum\n");
799                 goto discard_it;
800         }
801
802         dh = dccp_hdr(skb);
803
804         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
805         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
806
807         if (dccp_packet_without_ack(skb))
808                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
809         else
810                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
811
812         /* Step 2:
813          *      Look up flow ID in table and get corresponding socket */
814         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
815                                 dh->dccph_sport, dh->dccph_dport);
816         /*
817          * Step 2:
818          *      If no socket ...
819          */
820         if (sk == NULL) {
821                 dccp_pr_debug("failed to look up flow ID in table and "
822                               "get corresponding socket\n");
823                 goto no_dccp_socket;
824         }
825
826         /*
827          * Step 2:
828          *      ... or S.state == TIMEWAIT,
829          *              Generate Reset(No Connection) unless P.type == Reset
830          *              Drop packet and return
831          */
832         if (sk->sk_state == DCCP_TIME_WAIT) {
833                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
834                 inet_twsk_put(inet_twsk(sk));
835                 goto no_dccp_socket;
836         }
837
838         /*
839          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
840          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
841          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
842          */
843         min_cov = dccp_sk(sk)->dccps_pcrlen;
844         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
845                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
846                               dh->dccph_cscov, min_cov);
847                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
848                 goto discard_and_relse;
849         }
850
851         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
852                 goto discard_and_relse;
853
854         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
855
856 no_dccp_socket:
857         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
858                 goto discard_it;
859         /*
860          * Step 2:
861          *      If no socket ...
862          *              Generate Reset(No Connection) unless P.type == Reset
863          *              Drop packet and return
864          */
865         if (dh->dccph_type != DCCP_PKT_RESET) {
866                 DCCP_SKB_CB(skb)->dccpd_reset_code =
867                                         DCCP_RESET_CODE_NO_CONNECTION;
868                 dccp_v6_ctl_send_reset(sk, skb);
869         }
870
871 discard_it:
872         kfree_skb(skb);
873         return 0;
874
875 discard_and_relse:
876         sock_put(sk);
877         goto discard_it;
878 }
879
880 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
881                            int addr_len)
882 {
883         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
884         struct inet_connection_sock *icsk = inet_csk(sk);
885         struct inet_sock *inet = inet_sk(sk);
886         struct ipv6_pinfo *np = inet6_sk(sk);
887         struct dccp_sock *dp = dccp_sk(sk);
888         struct in6_addr *saddr = NULL, *final_p = NULL, final;
889         struct flowi fl;
890         struct dst_entry *dst;
891         int addr_type;
892         int err;
893
894         dp->dccps_role = DCCP_ROLE_CLIENT;
895
896         if (addr_len < SIN6_LEN_RFC2133)
897                 return -EINVAL;
898
899         if (usin->sin6_family != AF_INET6)
900                 return -EAFNOSUPPORT;
901
902         memset(&fl, 0, sizeof(fl));
903
904         if (np->sndflow) {
905                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
906                 IP6_ECN_flow_init(fl.fl6_flowlabel);
907                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
908                         struct ip6_flowlabel *flowlabel;
909                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
910                         if (flowlabel == NULL)
911                                 return -EINVAL;
912                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
913                         fl6_sock_release(flowlabel);
914                 }
915         }
916         /*
917          * connect() to INADDR_ANY means loopback (BSD'ism).
918          */
919         if (ipv6_addr_any(&usin->sin6_addr))
920                 usin->sin6_addr.s6_addr[15] = 1;
921
922         addr_type = ipv6_addr_type(&usin->sin6_addr);
923
924         if (addr_type & IPV6_ADDR_MULTICAST)
925                 return -ENETUNREACH;
926
927         if (addr_type & IPV6_ADDR_LINKLOCAL) {
928                 if (addr_len >= sizeof(struct sockaddr_in6) &&
929                     usin->sin6_scope_id) {
930                         /* If interface is set while binding, indices
931                          * must coincide.
932                          */
933                         if (sk->sk_bound_dev_if &&
934                             sk->sk_bound_dev_if != usin->sin6_scope_id)
935                                 return -EINVAL;
936
937                         sk->sk_bound_dev_if = usin->sin6_scope_id;
938                 }
939
940                 /* Connect to link-local address requires an interface */
941                 if (!sk->sk_bound_dev_if)
942                         return -EINVAL;
943         }
944
945         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
946         np->flow_label = fl.fl6_flowlabel;
947
948         /*
949          * DCCP over IPv4
950          */
951         if (addr_type == IPV6_ADDR_MAPPED) {
952                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
953                 struct sockaddr_in sin;
954
955                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
956
957                 if (__ipv6_only_sock(sk))
958                         return -ENETUNREACH;
959
960                 sin.sin_family = AF_INET;
961                 sin.sin_port = usin->sin6_port;
962                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
963
964                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
965                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
966
967                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
968                 if (err) {
969                         icsk->icsk_ext_hdr_len = exthdrlen;
970                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
971                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
972                         goto failure;
973                 }
974                 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
975                 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &np->rcv_saddr);
976
977                 return err;
978         }
979
980         if (!ipv6_addr_any(&np->rcv_saddr))
981                 saddr = &np->rcv_saddr;
982
983         fl.proto = IPPROTO_DCCP;
984         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
985         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
986         fl.oif = sk->sk_bound_dev_if;
987         fl.fl_ip_dport = usin->sin6_port;
988         fl.fl_ip_sport = inet->inet_sport;
989         security_sk_classify_flow(sk, &fl);
990
991         if (np->opt != NULL && np->opt->srcrt != NULL) {
992                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
993
994                 ipv6_addr_copy(&final, &fl.fl6_dst);
995                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
996                 final_p = &final;
997         }
998
999         err = ip6_dst_lookup(sk, &dst, &fl);
1000         if (err)
1001                 goto failure;
1002
1003         if (final_p)
1004                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1005
1006         err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
1007         if (err < 0) {
1008                 if (err == -EREMOTE)
1009                         err = ip6_dst_blackhole(sk, &dst, &fl);
1010                 if (err < 0)
1011                         goto failure;
1012         }
1013
1014         if (saddr == NULL) {
1015                 saddr = &fl.fl6_src;
1016                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1017         }
1018
1019         /* set the source address */
1020         ipv6_addr_copy(&np->saddr, saddr);
1021         inet->inet_rcv_saddr = LOOPBACK4_IPV6;
1022
1023         __ip6_dst_store(sk, dst, NULL, NULL);
1024
1025         icsk->icsk_ext_hdr_len = 0;
1026         if (np->opt != NULL)
1027                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1028                                           np->opt->opt_nflen);
1029
1030         inet->inet_dport = usin->sin6_port;
1031
1032         dccp_set_state(sk, DCCP_REQUESTING);
1033         err = inet6_hash_connect(&dccp_death_row, sk);
1034         if (err)
1035                 goto late_failure;
1036
1037         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1038                                                       np->daddr.s6_addr32,
1039                                                       inet->inet_sport,
1040                                                       inet->inet_dport);
1041         err = dccp_connect(sk);
1042         if (err)
1043                 goto late_failure;
1044
1045         return 0;
1046
1047 late_failure:
1048         dccp_set_state(sk, DCCP_CLOSED);
1049         __sk_dst_reset(sk);
1050 failure:
1051         inet->inet_dport = 0;
1052         sk->sk_route_caps = 0;
1053         return err;
1054 }
1055
1056 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1057         .queue_xmit        = inet6_csk_xmit,
1058         .send_check        = dccp_v6_send_check,
1059         .rebuild_header    = inet6_sk_rebuild_header,
1060         .conn_request      = dccp_v6_conn_request,
1061         .syn_recv_sock     = dccp_v6_request_recv_sock,
1062         .net_header_len    = sizeof(struct ipv6hdr),
1063         .setsockopt        = ipv6_setsockopt,
1064         .getsockopt        = ipv6_getsockopt,
1065         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1066         .sockaddr_len      = sizeof(struct sockaddr_in6),
1067         .bind_conflict     = inet6_csk_bind_conflict,
1068 #ifdef CONFIG_COMPAT
1069         .compat_setsockopt = compat_ipv6_setsockopt,
1070         .compat_getsockopt = compat_ipv6_getsockopt,
1071 #endif
1072 };
1073
1074 /*
1075  *      DCCP over IPv4 via INET6 API
1076  */
1077 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1078         .queue_xmit        = ip_queue_xmit,
1079         .send_check        = dccp_v4_send_check,
1080         .rebuild_header    = inet_sk_rebuild_header,
1081         .conn_request      = dccp_v6_conn_request,
1082         .syn_recv_sock     = dccp_v6_request_recv_sock,
1083         .net_header_len    = sizeof(struct iphdr),
1084         .setsockopt        = ipv6_setsockopt,
1085         .getsockopt        = ipv6_getsockopt,
1086         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1087         .sockaddr_len      = sizeof(struct sockaddr_in6),
1088 #ifdef CONFIG_COMPAT
1089         .compat_setsockopt = compat_ipv6_setsockopt,
1090         .compat_getsockopt = compat_ipv6_getsockopt,
1091 #endif
1092 };
1093
1094 /* NOTE: A lot of things set to zero explicitly by call to
1095  *       sk_alloc() so need not be done here.
1096  */
1097 static int dccp_v6_init_sock(struct sock *sk)
1098 {
1099         static __u8 dccp_v6_ctl_sock_initialized;
1100         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1101
1102         if (err == 0) {
1103                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1104                         dccp_v6_ctl_sock_initialized = 1;
1105                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1106         }
1107
1108         return err;
1109 }
1110
1111 static void dccp_v6_destroy_sock(struct sock *sk)
1112 {
1113         dccp_destroy_sock(sk);
1114         inet6_destroy_sock(sk);
1115 }
1116
1117 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1118         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1119 };
1120
1121 static struct proto dccp_v6_prot = {
1122         .name              = "DCCPv6",
1123         .owner             = THIS_MODULE,
1124         .close             = dccp_close,
1125         .connect           = dccp_v6_connect,
1126         .disconnect        = dccp_disconnect,
1127         .ioctl             = dccp_ioctl,
1128         .init              = dccp_v6_init_sock,
1129         .setsockopt        = dccp_setsockopt,
1130         .getsockopt        = dccp_getsockopt,
1131         .sendmsg           = dccp_sendmsg,
1132         .recvmsg           = dccp_recvmsg,
1133         .backlog_rcv       = dccp_v6_do_rcv,
1134         .hash              = dccp_v6_hash,
1135         .unhash            = inet_unhash,
1136         .accept            = inet_csk_accept,
1137         .get_port          = inet_csk_get_port,
1138         .shutdown          = dccp_shutdown,
1139         .destroy           = dccp_v6_destroy_sock,
1140         .orphan_count      = &dccp_orphan_count,
1141         .max_header        = MAX_DCCP_HEADER,
1142         .obj_size          = sizeof(struct dccp6_sock),
1143         .slab_flags        = SLAB_DESTROY_BY_RCU,
1144         .rsk_prot          = &dccp6_request_sock_ops,
1145         .twsk_prot         = &dccp6_timewait_sock_ops,
1146         .h.hashinfo        = &dccp_hashinfo,
1147 #ifdef CONFIG_COMPAT
1148         .compat_setsockopt = compat_dccp_setsockopt,
1149         .compat_getsockopt = compat_dccp_getsockopt,
1150 #endif
1151 };
1152
1153 static const struct inet6_protocol dccp_v6_protocol = {
1154         .handler        = dccp_v6_rcv,
1155         .err_handler    = dccp_v6_err,
1156         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1157 };
1158
1159 static const struct proto_ops inet6_dccp_ops = {
1160         .family            = PF_INET6,
1161         .owner             = THIS_MODULE,
1162         .release           = inet6_release,
1163         .bind              = inet6_bind,
1164         .connect           = inet_stream_connect,
1165         .socketpair        = sock_no_socketpair,
1166         .accept            = inet_accept,
1167         .getname           = inet6_getname,
1168         .poll              = dccp_poll,
1169         .ioctl             = inet6_ioctl,
1170         .listen            = inet_dccp_listen,
1171         .shutdown          = inet_shutdown,
1172         .setsockopt        = sock_common_setsockopt,
1173         .getsockopt        = sock_common_getsockopt,
1174         .sendmsg           = inet_sendmsg,
1175         .recvmsg           = sock_common_recvmsg,
1176         .mmap              = sock_no_mmap,
1177         .sendpage          = sock_no_sendpage,
1178 #ifdef CONFIG_COMPAT
1179         .compat_setsockopt = compat_sock_common_setsockopt,
1180         .compat_getsockopt = compat_sock_common_getsockopt,
1181 #endif
1182 };
1183
1184 static struct inet_protosw dccp_v6_protosw = {
1185         .type           = SOCK_DCCP,
1186         .protocol       = IPPROTO_DCCP,
1187         .prot           = &dccp_v6_prot,
1188         .ops            = &inet6_dccp_ops,
1189         .flags          = INET_PROTOSW_ICSK,
1190 };
1191
1192 static int dccp_v6_init_net(struct net *net)
1193 {
1194         int err;
1195
1196         err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1197                                    SOCK_DCCP, IPPROTO_DCCP, net);
1198         return err;
1199 }
1200
1201 static void dccp_v6_exit_net(struct net *net)
1202 {
1203         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1204 }
1205
1206 static struct pernet_operations dccp_v6_ops = {
1207         .init   = dccp_v6_init_net,
1208         .exit   = dccp_v6_exit_net,
1209 };
1210
1211 static int __init dccp_v6_init(void)
1212 {
1213         int err = proto_register(&dccp_v6_prot, 1);
1214
1215         if (err != 0)
1216                 goto out;
1217
1218         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1219         if (err != 0)
1220                 goto out_unregister_proto;
1221
1222         inet6_register_protosw(&dccp_v6_protosw);
1223
1224         err = register_pernet_subsys(&dccp_v6_ops);
1225         if (err != 0)
1226                 goto out_destroy_ctl_sock;
1227 out:
1228         return err;
1229
1230 out_destroy_ctl_sock:
1231         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1232         inet6_unregister_protosw(&dccp_v6_protosw);
1233 out_unregister_proto:
1234         proto_unregister(&dccp_v6_prot);
1235         goto out;
1236 }
1237
1238 static void __exit dccp_v6_exit(void)
1239 {
1240         unregister_pernet_subsys(&dccp_v6_ops);
1241         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1242         inet6_unregister_protosw(&dccp_v6_protosw);
1243         proto_unregister(&dccp_v6_prot);
1244 }
1245
1246 module_init(dccp_v6_init);
1247 module_exit(dccp_v6_exit);
1248
1249 /*
1250  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1251  * values directly, Also cover the case where the protocol is not specified,
1252  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1253  */
1254 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1255 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1256 MODULE_LICENSE("GPL");
1257 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1258 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");