11062780bb02b84990aa4c89e40d3815940ecec7
[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 struct inet_connection_sock_af_ops dccp_ipv6_mapped;
39 static 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                         int type, int 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->dport;
162                         fl.fl_ip_sport = inet->sport;
163                         security_sk_classify_flow(sk, &fl);
164
165                         err = ip6_dst_lookup(sk, &dst, &fl);
166                         if (err) {
167                                 sk->sk_err_soft = -err;
168                                 goto out;
169                         }
170
171                         err = xfrm_lookup(&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_sk(sk)->sport;
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(&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         if (inet6_rsk(req)->pktopts != NULL)
308                 kfree_skb(inet6_rsk(req)->pktopts);
309 }
310
311 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
312 {
313         struct ipv6hdr *rxip6h;
314         struct sk_buff *skb;
315         struct flowi fl;
316         struct net *net = dev_net(rxskb->dst->dev);
317         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
318
319         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
320                 return;
321
322         if (!ipv6_unicast_destination(rxskb))
323                 return;
324
325         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
326         if (skb == NULL)
327                 return;
328
329         rxip6h = ipv6_hdr(rxskb);
330         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
331                                                             &rxip6h->daddr);
332
333         memset(&fl, 0, sizeof(fl));
334         ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
335         ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
336
337         fl.proto = IPPROTO_DCCP;
338         fl.oif = inet6_iif(rxskb);
339         fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
340         fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
341         security_skb_classify_flow(rxskb, &fl);
342
343         /* sk = NULL, but it is safe for now. RST socket required. */
344         if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) {
345                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
346                         ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
347                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
348                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
349                         return;
350                 }
351         }
352
353         kfree_skb(skb);
354 }
355
356 static struct request_sock_ops dccp6_request_sock_ops = {
357         .family         = AF_INET6,
358         .obj_size       = sizeof(struct dccp6_request_sock),
359         .rtx_syn_ack    = dccp_v6_send_response,
360         .send_ack       = dccp_reqsk_send_ack,
361         .destructor     = dccp_v6_reqsk_destructor,
362         .send_reset     = dccp_v6_ctl_send_reset,
363 };
364
365 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
366 {
367         const struct dccp_hdr *dh = dccp_hdr(skb);
368         const struct ipv6hdr *iph = ipv6_hdr(skb);
369         struct sock *nsk;
370         struct request_sock **prev;
371         /* Find possible connection requests. */
372         struct request_sock *req = inet6_csk_search_req(sk, &prev,
373                                                         dh->dccph_sport,
374                                                         &iph->saddr,
375                                                         &iph->daddr,
376                                                         inet6_iif(skb));
377         if (req != NULL)
378                 return dccp_check_req(sk, skb, req, prev);
379
380         nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
381                                          &iph->saddr, dh->dccph_sport,
382                                          &iph->daddr, ntohs(dh->dccph_dport),
383                                          inet6_iif(skb));
384         if (nsk != NULL) {
385                 if (nsk->sk_state != DCCP_TIME_WAIT) {
386                         bh_lock_sock(nsk);
387                         return nsk;
388                 }
389                 inet_twsk_put(inet_twsk(nsk));
390                 return NULL;
391         }
392
393         return sk;
394 }
395
396 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
397 {
398         struct request_sock *req;
399         struct dccp_request_sock *dreq;
400         struct inet6_request_sock *ireq6;
401         struct ipv6_pinfo *np = inet6_sk(sk);
402         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
403         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
404
405         if (skb->protocol == htons(ETH_P_IP))
406                 return dccp_v4_conn_request(sk, skb);
407
408         if (!ipv6_unicast_destination(skb))
409                 return 0;       /* discard, don't send a reset here */
410
411         if (dccp_bad_service_code(sk, service)) {
412                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
413                 goto drop;
414         }
415         /*
416          * There are no SYN attacks on IPv6, yet...
417          */
418         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
419         if (inet_csk_reqsk_queue_is_full(sk))
420                 goto drop;
421
422         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
423                 goto drop;
424
425         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
426         if (req == NULL)
427                 goto drop;
428
429         dccp_reqsk_init(req, skb);
430
431         dreq = dccp_rsk(req);
432         if (dccp_parse_options(sk, dreq, skb))
433                 goto drop_and_free;
434
435         if (security_inet_conn_request(sk, skb, req))
436                 goto drop_and_free;
437
438         ireq6 = inet6_rsk(req);
439         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
440         ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
441
442         if (ipv6_opt_accepted(sk, skb) ||
443             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
444             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
445                 atomic_inc(&skb->users);
446                 ireq6->pktopts = skb;
447         }
448         ireq6->iif = sk->sk_bound_dev_if;
449
450         /* So that link locals have meaning */
451         if (!sk->sk_bound_dev_if &&
452             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
453                 ireq6->iif = inet6_iif(skb);
454
455         /*
456          * Step 3: Process LISTEN state
457          *
458          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
459          *
460          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
461          *   dccp_create_openreq_child.
462          */
463         dreq->dreq_isr     = dcb->dccpd_seq;
464         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
465         dreq->dreq_service = service;
466
467         if (dccp_v6_send_response(sk, req))
468                 goto drop_and_free;
469
470         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
471         return 0;
472
473 drop_and_free:
474         reqsk_free(req);
475 drop:
476         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
477         return -1;
478 }
479
480 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
481                                               struct sk_buff *skb,
482                                               struct request_sock *req,
483                                               struct dst_entry *dst)
484 {
485         struct inet6_request_sock *ireq6 = inet6_rsk(req);
486         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
487         struct inet_sock *newinet;
488         struct dccp_sock *newdp;
489         struct dccp6_sock *newdp6;
490         struct sock *newsk;
491         struct ipv6_txoptions *opt;
492
493         if (skb->protocol == htons(ETH_P_IP)) {
494                 /*
495                  *      v6 mapped
496                  */
497                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
498                 if (newsk == NULL)
499                         return NULL;
500
501                 newdp6 = (struct dccp6_sock *)newsk;
502                 newdp = dccp_sk(newsk);
503                 newinet = inet_sk(newsk);
504                 newinet->pinet6 = &newdp6->inet6;
505                 newnp = inet6_sk(newsk);
506
507                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
508
509                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
510                               newinet->daddr);
511
512                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
513                               newinet->saddr);
514
515                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
516
517                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
518                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
519                 newnp->pktoptions  = NULL;
520                 newnp->opt         = NULL;
521                 newnp->mcast_oif   = inet6_iif(skb);
522                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
523
524                 /*
525                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
526                  * here, dccp_create_openreq_child now does this for us, see the comment in
527                  * that function for the gory details. -acme
528                  */
529
530                 /* It is tricky place. Until this moment IPv4 tcp
531                    worked with IPv6 icsk.icsk_af_ops.
532                    Sync it now.
533                  */
534                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
535
536                 return newsk;
537         }
538
539         opt = np->opt;
540
541         if (sk_acceptq_is_full(sk))
542                 goto out_overflow;
543
544         if (dst == NULL) {
545                 struct in6_addr *final_p = NULL, final;
546                 struct flowi fl;
547
548                 memset(&fl, 0, sizeof(fl));
549                 fl.proto = IPPROTO_DCCP;
550                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
551                 if (opt != NULL && opt->srcrt != NULL) {
552                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
553
554                         ipv6_addr_copy(&final, &fl.fl6_dst);
555                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
556                         final_p = &final;
557                 }
558                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
559                 fl.oif = sk->sk_bound_dev_if;
560                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
561                 fl.fl_ip_sport = inet_sk(sk)->sport;
562                 security_sk_classify_flow(sk, &fl);
563
564                 if (ip6_dst_lookup(sk, &dst, &fl))
565                         goto out;
566
567                 if (final_p)
568                         ipv6_addr_copy(&fl.fl6_dst, final_p);
569
570                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
571                         goto out;
572         }
573
574         newsk = dccp_create_openreq_child(sk, req, skb);
575         if (newsk == NULL)
576                 goto out;
577
578         /*
579          * No need to charge this sock to the relevant IPv6 refcnt debug socks
580          * count here, dccp_create_openreq_child now does this for us, see the
581          * comment in that function for the gory details. -acme
582          */
583
584         __ip6_dst_store(newsk, dst, NULL, NULL);
585         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
586                                                       NETIF_F_TSO);
587         newdp6 = (struct dccp6_sock *)newsk;
588         newinet = inet_sk(newsk);
589         newinet->pinet6 = &newdp6->inet6;
590         newdp = dccp_sk(newsk);
591         newnp = inet6_sk(newsk);
592
593         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
594
595         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
596         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
597         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
598         newsk->sk_bound_dev_if = ireq6->iif;
599
600         /* Now IPv6 options...
601
602            First: no IPv4 options.
603          */
604         newinet->opt = NULL;
605
606         /* Clone RX bits */
607         newnp->rxopt.all = np->rxopt.all;
608
609         /* Clone pktoptions received with SYN */
610         newnp->pktoptions = NULL;
611         if (ireq6->pktopts != NULL) {
612                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
613                 kfree_skb(ireq6->pktopts);
614                 ireq6->pktopts = NULL;
615                 if (newnp->pktoptions)
616                         skb_set_owner_r(newnp->pktoptions, newsk);
617         }
618         newnp->opt        = NULL;
619         newnp->mcast_oif  = inet6_iif(skb);
620         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
621
622         /*
623          * Clone native IPv6 options from listening socket (if any)
624          *
625          * Yes, keeping reference count would be much more clever, but we make
626          * one more one thing there: reattach optmem to newsk.
627          */
628         if (opt != NULL) {
629                 newnp->opt = ipv6_dup_options(newsk, opt);
630                 if (opt != np->opt)
631                         sock_kfree_s(sk, opt, opt->tot_len);
632         }
633
634         inet_csk(newsk)->icsk_ext_hdr_len = 0;
635         if (newnp->opt != NULL)
636                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
637                                                      newnp->opt->opt_flen);
638
639         dccp_sync_mss(newsk, dst_mtu(dst));
640
641         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
642
643         __inet6_hash(newsk);
644         __inet_inherit_port(sk, newsk);
645
646         return newsk;
647
648 out_overflow:
649         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
650 out:
651         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
652         if (opt != NULL && opt != np->opt)
653                 sock_kfree_s(sk, opt, opt->tot_len);
654         dst_release(dst);
655         return NULL;
656 }
657
658 /* The socket must have it's spinlock held when we get
659  * here.
660  *
661  * We have a potential double-lock case here, so even when
662  * doing backlog processing we use the BH locking scheme.
663  * This is because we cannot sleep with the original spinlock
664  * held.
665  */
666 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
667 {
668         struct ipv6_pinfo *np = inet6_sk(sk);
669         struct sk_buff *opt_skb = NULL;
670
671         /* Imagine: socket is IPv6. IPv4 packet arrives,
672            goes to IPv4 receive handler and backlogged.
673            From backlog it always goes here. Kerboom...
674            Fortunately, dccp_rcv_established and rcv_established
675            handle them correctly, but it is not case with
676            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
677          */
678
679         if (skb->protocol == htons(ETH_P_IP))
680                 return dccp_v4_do_rcv(sk, skb);
681
682         if (sk_filter(sk, skb))
683                 goto discard;
684
685         /*
686          * socket locking is here for SMP purposes as backlog rcv is currently
687          * called with bh processing disabled.
688          */
689
690         /* Do Stevens' IPV6_PKTOPTIONS.
691
692            Yes, guys, it is the only place in our code, where we
693            may make it not affecting IPv4.
694            The rest of code is protocol independent,
695            and I do not like idea to uglify IPv4.
696
697            Actually, all the idea behind IPV6_PKTOPTIONS
698            looks not very well thought. For now we latch
699            options, received in the last packet, enqueued
700            by tcp. Feel free to propose better solution.
701                                                --ANK (980728)
702          */
703         if (np->rxopt.all)
704         /*
705          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
706          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
707          */
708                 opt_skb = skb_clone(skb, GFP_ATOMIC);
709
710         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
711                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
712                         goto reset;
713                 if (opt_skb) {
714                         /* XXX This is where we would goto ipv6_pktoptions. */
715                         __kfree_skb(opt_skb);
716                 }
717                 return 0;
718         }
719
720         /*
721          *  Step 3: Process LISTEN state
722          *     If S.state == LISTEN,
723          *       If P.type == Request or P contains a valid Init Cookie option,
724          *            (* Must scan the packet's options to check for Init
725          *               Cookies.  Only Init Cookies are processed here,
726          *               however; other options are processed in Step 8.  This
727          *               scan need only be performed if the endpoint uses Init
728          *               Cookies *)
729          *            (* Generate a new socket and switch to that socket *)
730          *            Set S := new socket for this port pair
731          *            S.state = RESPOND
732          *            Choose S.ISS (initial seqno) or set from Init Cookies
733          *            Initialize S.GAR := S.ISS
734          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
735          *            Continue with S.state == RESPOND
736          *            (* A Response packet will be generated in Step 11 *)
737          *       Otherwise,
738          *            Generate Reset(No Connection) unless P.type == Reset
739          *            Drop packet and return
740          *
741          * NOTE: the check for the packet types is done in
742          *       dccp_rcv_state_process
743          */
744         if (sk->sk_state == DCCP_LISTEN) {
745                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
746
747                 if (nsk == NULL)
748                         goto discard;
749                 /*
750                  * Queue it on the new socket if the new socket is active,
751                  * otherwise we just shortcircuit this and continue with
752                  * the new socket..
753                  */
754                 if (nsk != sk) {
755                         if (dccp_child_process(sk, nsk, skb))
756                                 goto reset;
757                         if (opt_skb != NULL)
758                                 __kfree_skb(opt_skb);
759                         return 0;
760                 }
761         }
762
763         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
764                 goto reset;
765         if (opt_skb) {
766                 /* XXX This is where we would goto ipv6_pktoptions. */
767                 __kfree_skb(opt_skb);
768         }
769         return 0;
770
771 reset:
772         dccp_v6_ctl_send_reset(sk, skb);
773 discard:
774         if (opt_skb != NULL)
775                 __kfree_skb(opt_skb);
776         kfree_skb(skb);
777         return 0;
778 }
779
780 static int dccp_v6_rcv(struct sk_buff *skb)
781 {
782         const struct dccp_hdr *dh;
783         struct sock *sk;
784         int min_cov;
785
786         /* Step 1: Check header basics */
787
788         if (dccp_invalid_packet(skb))
789                 goto discard_it;
790
791         /* Step 1: If header checksum is incorrect, drop packet and return. */
792         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
793                                      &ipv6_hdr(skb)->daddr)) {
794                 DCCP_WARN("dropped packet with invalid checksum\n");
795                 goto discard_it;
796         }
797
798         dh = dccp_hdr(skb);
799
800         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
801         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
802
803         if (dccp_packet_without_ack(skb))
804                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
805         else
806                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
807
808         /* Step 2:
809          *      Look up flow ID in table and get corresponding socket */
810         sk = __inet6_lookup_skb(&dccp_hashinfo, skb,
811                                 dh->dccph_sport, dh->dccph_dport);
812         /*
813          * Step 2:
814          *      If no socket ...
815          */
816         if (sk == NULL) {
817                 dccp_pr_debug("failed to look up flow ID in table and "
818                               "get corresponding socket\n");
819                 goto no_dccp_socket;
820         }
821
822         /*
823          * Step 2:
824          *      ... or S.state == TIMEWAIT,
825          *              Generate Reset(No Connection) unless P.type == Reset
826          *              Drop packet and return
827          */
828         if (sk->sk_state == DCCP_TIME_WAIT) {
829                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
830                 inet_twsk_put(inet_twsk(sk));
831                 goto no_dccp_socket;
832         }
833
834         /*
835          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
836          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
837          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
838          */
839         min_cov = dccp_sk(sk)->dccps_pcrlen;
840         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
841                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
842                               dh->dccph_cscov, min_cov);
843                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
844                 goto discard_and_relse;
845         }
846
847         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
848                 goto discard_and_relse;
849
850         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
851
852 no_dccp_socket:
853         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
854                 goto discard_it;
855         /*
856          * Step 2:
857          *      If no socket ...
858          *              Generate Reset(No Connection) unless P.type == Reset
859          *              Drop packet and return
860          */
861         if (dh->dccph_type != DCCP_PKT_RESET) {
862                 DCCP_SKB_CB(skb)->dccpd_reset_code =
863                                         DCCP_RESET_CODE_NO_CONNECTION;
864                 dccp_v6_ctl_send_reset(sk, skb);
865         }
866
867 discard_it:
868         kfree_skb(skb);
869         return 0;
870
871 discard_and_relse:
872         sock_put(sk);
873         goto discard_it;
874 }
875
876 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
877                            int addr_len)
878 {
879         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
880         struct inet_connection_sock *icsk = inet_csk(sk);
881         struct inet_sock *inet = inet_sk(sk);
882         struct ipv6_pinfo *np = inet6_sk(sk);
883         struct dccp_sock *dp = dccp_sk(sk);
884         struct in6_addr *saddr = NULL, *final_p = NULL, final;
885         struct flowi fl;
886         struct dst_entry *dst;
887         int addr_type;
888         int err;
889
890         dp->dccps_role = DCCP_ROLE_CLIENT;
891
892         if (addr_len < SIN6_LEN_RFC2133)
893                 return -EINVAL;
894
895         if (usin->sin6_family != AF_INET6)
896                 return -EAFNOSUPPORT;
897
898         memset(&fl, 0, sizeof(fl));
899
900         if (np->sndflow) {
901                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
902                 IP6_ECN_flow_init(fl.fl6_flowlabel);
903                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
904                         struct ip6_flowlabel *flowlabel;
905                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
906                         if (flowlabel == NULL)
907                                 return -EINVAL;
908                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
909                         fl6_sock_release(flowlabel);
910                 }
911         }
912         /*
913          * connect() to INADDR_ANY means loopback (BSD'ism).
914          */
915         if (ipv6_addr_any(&usin->sin6_addr))
916                 usin->sin6_addr.s6_addr[15] = 1;
917
918         addr_type = ipv6_addr_type(&usin->sin6_addr);
919
920         if (addr_type & IPV6_ADDR_MULTICAST)
921                 return -ENETUNREACH;
922
923         if (addr_type & IPV6_ADDR_LINKLOCAL) {
924                 if (addr_len >= sizeof(struct sockaddr_in6) &&
925                     usin->sin6_scope_id) {
926                         /* If interface is set while binding, indices
927                          * must coincide.
928                          */
929                         if (sk->sk_bound_dev_if &&
930                             sk->sk_bound_dev_if != usin->sin6_scope_id)
931                                 return -EINVAL;
932
933                         sk->sk_bound_dev_if = usin->sin6_scope_id;
934                 }
935
936                 /* Connect to link-local address requires an interface */
937                 if (!sk->sk_bound_dev_if)
938                         return -EINVAL;
939         }
940
941         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
942         np->flow_label = fl.fl6_flowlabel;
943
944         /*
945          * DCCP over IPv4
946          */
947         if (addr_type == IPV6_ADDR_MAPPED) {
948                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
949                 struct sockaddr_in sin;
950
951                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
952
953                 if (__ipv6_only_sock(sk))
954                         return -ENETUNREACH;
955
956                 sin.sin_family = AF_INET;
957                 sin.sin_port = usin->sin6_port;
958                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
959
960                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
961                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
962
963                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
964                 if (err) {
965                         icsk->icsk_ext_hdr_len = exthdrlen;
966                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
967                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
968                         goto failure;
969                 } else {
970                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
971                                       inet->saddr);
972                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
973                                       inet->rcv_saddr);
974                 }
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->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(&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->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->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->sport, inet->dport);
1039         err = dccp_connect(sk);
1040         if (err)
1041                 goto late_failure;
1042
1043         return 0;
1044
1045 late_failure:
1046         dccp_set_state(sk, DCCP_CLOSED);
1047         __sk_dst_reset(sk);
1048 failure:
1049         inet->dport = 0;
1050         sk->sk_route_caps = 0;
1051         return err;
1052 }
1053
1054 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1055         .queue_xmit        = inet6_csk_xmit,
1056         .send_check        = dccp_v6_send_check,
1057         .rebuild_header    = inet6_sk_rebuild_header,
1058         .conn_request      = dccp_v6_conn_request,
1059         .syn_recv_sock     = dccp_v6_request_recv_sock,
1060         .net_header_len    = sizeof(struct ipv6hdr),
1061         .setsockopt        = ipv6_setsockopt,
1062         .getsockopt        = ipv6_getsockopt,
1063         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1064         .sockaddr_len      = sizeof(struct sockaddr_in6),
1065         .bind_conflict     = inet6_csk_bind_conflict,
1066 #ifdef CONFIG_COMPAT
1067         .compat_setsockopt = compat_ipv6_setsockopt,
1068         .compat_getsockopt = compat_ipv6_getsockopt,
1069 #endif
1070 };
1071
1072 /*
1073  *      DCCP over IPv4 via INET6 API
1074  */
1075 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1076         .queue_xmit        = ip_queue_xmit,
1077         .send_check        = dccp_v4_send_check,
1078         .rebuild_header    = inet_sk_rebuild_header,
1079         .conn_request      = dccp_v6_conn_request,
1080         .syn_recv_sock     = dccp_v6_request_recv_sock,
1081         .net_header_len    = sizeof(struct iphdr),
1082         .setsockopt        = ipv6_setsockopt,
1083         .getsockopt        = ipv6_getsockopt,
1084         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1085         .sockaddr_len      = sizeof(struct sockaddr_in6),
1086 #ifdef CONFIG_COMPAT
1087         .compat_setsockopt = compat_ipv6_setsockopt,
1088         .compat_getsockopt = compat_ipv6_getsockopt,
1089 #endif
1090 };
1091
1092 /* NOTE: A lot of things set to zero explicitly by call to
1093  *       sk_alloc() so need not be done here.
1094  */
1095 static int dccp_v6_init_sock(struct sock *sk)
1096 {
1097         static __u8 dccp_v6_ctl_sock_initialized;
1098         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1099
1100         if (err == 0) {
1101                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1102                         dccp_v6_ctl_sock_initialized = 1;
1103                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1104         }
1105
1106         return err;
1107 }
1108
1109 static void dccp_v6_destroy_sock(struct sock *sk)
1110 {
1111         dccp_destroy_sock(sk);
1112         inet6_destroy_sock(sk);
1113 }
1114
1115 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1116         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1117 };
1118
1119 static struct proto dccp_v6_prot = {
1120         .name              = "DCCPv6",
1121         .owner             = THIS_MODULE,
1122         .close             = dccp_close,
1123         .connect           = dccp_v6_connect,
1124         .disconnect        = dccp_disconnect,
1125         .ioctl             = dccp_ioctl,
1126         .init              = dccp_v6_init_sock,
1127         .setsockopt        = dccp_setsockopt,
1128         .getsockopt        = dccp_getsockopt,
1129         .sendmsg           = dccp_sendmsg,
1130         .recvmsg           = dccp_recvmsg,
1131         .backlog_rcv       = dccp_v6_do_rcv,
1132         .hash              = dccp_v6_hash,
1133         .unhash            = inet_unhash,
1134         .accept            = inet_csk_accept,
1135         .get_port          = inet_csk_get_port,
1136         .shutdown          = dccp_shutdown,
1137         .destroy           = dccp_v6_destroy_sock,
1138         .orphan_count      = &dccp_orphan_count,
1139         .max_header        = MAX_DCCP_HEADER,
1140         .obj_size          = sizeof(struct dccp6_sock),
1141         .rsk_prot          = &dccp6_request_sock_ops,
1142         .twsk_prot         = &dccp6_timewait_sock_ops,
1143         .h.hashinfo        = &dccp_hashinfo,
1144 #ifdef CONFIG_COMPAT
1145         .compat_setsockopt = compat_dccp_setsockopt,
1146         .compat_getsockopt = compat_dccp_getsockopt,
1147 #endif
1148 };
1149
1150 static struct inet6_protocol dccp_v6_protocol = {
1151         .handler        = dccp_v6_rcv,
1152         .err_handler    = dccp_v6_err,
1153         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1154 };
1155
1156 static struct proto_ops inet6_dccp_ops = {
1157         .family            = PF_INET6,
1158         .owner             = THIS_MODULE,
1159         .release           = inet6_release,
1160         .bind              = inet6_bind,
1161         .connect           = inet_stream_connect,
1162         .socketpair        = sock_no_socketpair,
1163         .accept            = inet_accept,
1164         .getname           = inet6_getname,
1165         .poll              = dccp_poll,
1166         .ioctl             = inet6_ioctl,
1167         .listen            = inet_dccp_listen,
1168         .shutdown          = inet_shutdown,
1169         .setsockopt        = sock_common_setsockopt,
1170         .getsockopt        = sock_common_getsockopt,
1171         .sendmsg           = inet_sendmsg,
1172         .recvmsg           = sock_common_recvmsg,
1173         .mmap              = sock_no_mmap,
1174         .sendpage          = sock_no_sendpage,
1175 #ifdef CONFIG_COMPAT
1176         .compat_setsockopt = compat_sock_common_setsockopt,
1177         .compat_getsockopt = compat_sock_common_getsockopt,
1178 #endif
1179 };
1180
1181 static struct inet_protosw dccp_v6_protosw = {
1182         .type           = SOCK_DCCP,
1183         .protocol       = IPPROTO_DCCP,
1184         .prot           = &dccp_v6_prot,
1185         .ops            = &inet6_dccp_ops,
1186         .capability     = -1,
1187         .flags          = INET_PROTOSW_ICSK,
1188 };
1189
1190 static int dccp_v6_init_net(struct net *net)
1191 {
1192         int err;
1193
1194         err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1195                                    SOCK_DCCP, IPPROTO_DCCP, net);
1196         return err;
1197 }
1198
1199 static void dccp_v6_exit_net(struct net *net)
1200 {
1201         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1202 }
1203
1204 static struct pernet_operations dccp_v6_ops = {
1205         .init   = dccp_v6_init_net,
1206         .exit   = dccp_v6_exit_net,
1207 };
1208
1209 static int __init dccp_v6_init(void)
1210 {
1211         int err = proto_register(&dccp_v6_prot, 1);
1212
1213         if (err != 0)
1214                 goto out;
1215
1216         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1217         if (err != 0)
1218                 goto out_unregister_proto;
1219
1220         inet6_register_protosw(&dccp_v6_protosw);
1221
1222         err = register_pernet_subsys(&dccp_v6_ops);
1223         if (err != 0)
1224                 goto out_destroy_ctl_sock;
1225 out:
1226         return err;
1227
1228 out_destroy_ctl_sock:
1229         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1230         inet6_unregister_protosw(&dccp_v6_protosw);
1231 out_unregister_proto:
1232         proto_unregister(&dccp_v6_prot);
1233         goto out;
1234 }
1235
1236 static void __exit dccp_v6_exit(void)
1237 {
1238         unregister_pernet_subsys(&dccp_v6_ops);
1239         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1240         inet6_unregister_protosw(&dccp_v6_protosw);
1241         proto_unregister(&dccp_v6_prot);
1242 }
1243
1244 module_init(dccp_v6_init);
1245 module_exit(dccp_v6_exit);
1246
1247 /*
1248  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1249  * values directly, Also cover the case where the protocol is not specified,
1250  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1251  */
1252 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1253 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1254 MODULE_LICENSE("GPL");
1255 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1256 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");