[DCCP]: Sequence number wrap-around when sending reset
[linux-2.6.git] / net / dccp / ipv6.c
1 /*
2  *      DCCP over IPv6
3  *      Linux INET6 implementation
4  *
5  *      Based on net/dccp6/ipv6.c
6  *
7  *      Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
8  *
9  *      This program is free software; you can redistribute it and/or
10  *      modify it under the terms of the GNU General Public License
11  *      as published by the Free Software Foundation; either version
12  *      2 of the License, or (at your option) any later version.
13  */
14
15 #include <linux/module.h>
16 #include <linux/random.h>
17 #include <linux/xfrm.h>
18
19 #include <net/addrconf.h>
20 #include <net/inet_common.h>
21 #include <net/inet_hashtables.h>
22 #include <net/inet_sock.h>
23 #include <net/inet6_connection_sock.h>
24 #include <net/inet6_hashtables.h>
25 #include <net/ip6_route.h>
26 #include <net/ipv6.h>
27 #include <net/protocol.h>
28 #include <net/transp_v6.h>
29 #include <net/ip6_checksum.h>
30 #include <net/xfrm.h>
31
32 #include "dccp.h"
33 #include "ipv6.h"
34 #include "feat.h"
35
36 /* Socket used for sending RSTs and ACKs */
37 static struct socket *dccp_v6_ctl_socket;
38
39 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
40 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
41
42 static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
43 {
44         return inet_csk_get_port(&dccp_hashinfo, sk, snum,
45                                  inet6_csk_bind_conflict);
46 }
47
48 static void dccp_v6_hash(struct sock *sk)
49 {
50         if (sk->sk_state != DCCP_CLOSED) {
51                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
52                         dccp_hash(sk);
53                         return;
54                 }
55                 local_bh_disable();
56                 __inet6_hash(&dccp_hashinfo, sk);
57                 local_bh_enable();
58         }
59 }
60
61 /* add pseudo-header to DCCP checksum stored in skb->csum */
62 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
63                                       struct in6_addr *saddr,
64                                       struct in6_addr *daddr)
65 {
66         return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
67 }
68
69 static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
70                                       struct sk_buff *skb)
71 {
72         struct ipv6_pinfo *np = inet6_sk(sk);
73         struct dccp_hdr *dh = dccp_hdr(skb);
74
75         dccp_csum_outgoing(skb);
76         dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
77 }
78
79 static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
80                                                   __be16 sport, __be16 dport   )
81 {
82         return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
83 }
84
85 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
86 {
87         return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
88                                              ipv6_hdr(skb)->saddr.s6_addr32,
89                                              dccp_hdr(skb)->dccph_dport,
90                                              dccp_hdr(skb)->dccph_sport     );
91
92 }
93
94 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
95                         int type, int code, int offset, __be32 info)
96 {
97         struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
98         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
99         struct ipv6_pinfo *np;
100         struct sock *sk;
101         int err;
102         __u64 seq;
103
104         sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
105                           &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
106
107         if (sk == NULL) {
108                 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
109                 return;
110         }
111
112         if (sk->sk_state == DCCP_TIME_WAIT) {
113                 inet_twsk_put(inet_twsk(sk));
114                 return;
115         }
116
117         bh_lock_sock(sk);
118         if (sock_owned_by_user(sk))
119                 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
120
121         if (sk->sk_state == DCCP_CLOSED)
122                 goto out;
123
124         np = inet6_sk(sk);
125
126         if (type == ICMPV6_PKT_TOOBIG) {
127                 struct dst_entry *dst = NULL;
128
129                 if (sock_owned_by_user(sk))
130                         goto out;
131                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
132                         goto out;
133
134                 /* icmp should have updated the destination cache entry */
135                 dst = __sk_dst_check(sk, np->dst_cookie);
136                 if (dst == NULL) {
137                         struct inet_sock *inet = inet_sk(sk);
138                         struct flowi fl;
139
140                         /* BUGGG_FUTURE: Again, it is not clear how
141                            to handle rthdr case. Ignore this complexity
142                            for now.
143                          */
144                         memset(&fl, 0, sizeof(fl));
145                         fl.proto = IPPROTO_DCCP;
146                         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
147                         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
148                         fl.oif = sk->sk_bound_dev_if;
149                         fl.fl_ip_dport = inet->dport;
150                         fl.fl_ip_sport = inet->sport;
151                         security_sk_classify_flow(sk, &fl);
152
153                         err = ip6_dst_lookup(sk, &dst, &fl);
154                         if (err) {
155                                 sk->sk_err_soft = -err;
156                                 goto out;
157                         }
158
159                         err = xfrm_lookup(&dst, &fl, sk, 0);
160                         if (err < 0) {
161                                 sk->sk_err_soft = -err;
162                                 goto out;
163                         }
164                 } else
165                         dst_hold(dst);
166
167                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
168                         dccp_sync_mss(sk, dst_mtu(dst));
169                 } /* else let the usual retransmit timer handle it */
170                 dst_release(dst);
171                 goto out;
172         }
173
174         icmpv6_err_convert(type, code, &err);
175
176         seq = DCCP_SKB_CB(skb)->dccpd_seq;
177         /* Might be for an request_sock */
178         switch (sk->sk_state) {
179                 struct request_sock *req, **prev;
180         case DCCP_LISTEN:
181                 if (sock_owned_by_user(sk))
182                         goto out;
183
184                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
185                                            &hdr->daddr, &hdr->saddr,
186                                            inet6_iif(skb));
187                 if (req == NULL)
188                         goto out;
189
190                 /*
191                  * ICMPs are not backlogged, hence we cannot get an established
192                  * socket here.
193                  */
194                 BUG_TRAP(req->sk == NULL);
195
196                 if (seq != dccp_rsk(req)->dreq_iss) {
197                         NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
198                         goto out;
199                 }
200
201                 inet_csk_reqsk_queue_drop(sk, req, prev);
202                 goto out;
203
204         case DCCP_REQUESTING:
205         case DCCP_RESPOND:  /* Cannot happen.
206                                It can, it SYNs are crossed. --ANK */
207                 if (!sock_owned_by_user(sk)) {
208                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
209                         sk->sk_err = err;
210                         /*
211                          * Wake people up to see the error
212                          * (see connect in sock.c)
213                          */
214                         sk->sk_error_report(sk);
215                         dccp_done(sk);
216                 } else
217                         sk->sk_err_soft = err;
218                 goto out;
219         }
220
221         if (!sock_owned_by_user(sk) && np->recverr) {
222                 sk->sk_err = err;
223                 sk->sk_error_report(sk);
224         } else
225                 sk->sk_err_soft = err;
226
227 out:
228         bh_unlock_sock(sk);
229         sock_put(sk);
230 }
231
232
233 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
234                                  struct dst_entry *dst)
235 {
236         struct inet6_request_sock *ireq6 = inet6_rsk(req);
237         struct ipv6_pinfo *np = inet6_sk(sk);
238         struct sk_buff *skb;
239         struct ipv6_txoptions *opt = NULL;
240         struct in6_addr *final_p = NULL, final;
241         struct flowi fl;
242         int err = -1;
243
244         memset(&fl, 0, sizeof(fl));
245         fl.proto = IPPROTO_DCCP;
246         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
247         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
248         fl.fl6_flowlabel = 0;
249         fl.oif = ireq6->iif;
250         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
251         fl.fl_ip_sport = inet_sk(sk)->sport;
252         security_req_classify_flow(req, &fl);
253
254         if (dst == NULL) {
255                 opt = np->opt;
256
257                 if (opt != NULL && opt->srcrt != NULL) {
258                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
259
260                         ipv6_addr_copy(&final, &fl.fl6_dst);
261                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
262                         final_p = &final;
263                 }
264
265                 err = ip6_dst_lookup(sk, &dst, &fl);
266                 if (err)
267                         goto done;
268
269                 if (final_p)
270                         ipv6_addr_copy(&fl.fl6_dst, final_p);
271
272                 err = xfrm_lookup(&dst, &fl, sk, 0);
273                 if (err < 0)
274                         goto done;
275         }
276
277         skb = dccp_make_response(sk, dst, req);
278         if (skb != NULL) {
279                 struct dccp_hdr *dh = dccp_hdr(skb);
280
281                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
282                                                          &ireq6->loc_addr,
283                                                          &ireq6->rmt_addr);
284                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
285                 err = ip6_xmit(sk, skb, &fl, opt, 0);
286                 err = net_xmit_eval(err);
287         }
288
289 done:
290         if (opt != NULL && opt != np->opt)
291                 sock_kfree_s(sk, opt, opt->tot_len);
292         dst_release(dst);
293         return err;
294 }
295
296 static void dccp_v6_reqsk_destructor(struct request_sock *req)
297 {
298         if (inet6_rsk(req)->pktopts != NULL)
299                 kfree_skb(inet6_rsk(req)->pktopts);
300 }
301
302 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
303 {
304         struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
305         struct ipv6hdr *rxip6h;
306         const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
307                                        sizeof(struct dccp_hdr_ext) +
308                                        sizeof(struct dccp_hdr_reset);
309         struct sk_buff *skb;
310         struct flowi fl;
311         u64 seqno = 0;
312
313         if (rxdh->dccph_type == DCCP_PKT_RESET)
314                 return;
315
316         if (!ipv6_unicast_destination(rxskb))
317                 return;
318
319         skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
320                         GFP_ATOMIC);
321         if (skb == NULL)
322                 return;
323
324         skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
325
326         dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len);
327
328         /* Swap the send and the receive. */
329         dh->dccph_type  = DCCP_PKT_RESET;
330         dh->dccph_sport = rxdh->dccph_dport;
331         dh->dccph_dport = rxdh->dccph_sport;
332         dh->dccph_doff  = dccp_hdr_reset_len / 4;
333         dh->dccph_x     = 1;
334         dccp_hdr_reset(skb)->dccph_reset_code =
335                                 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
336
337         /* See "8.3.1. Abnormal Termination" in RFC 4340 */
338         if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
339                 seqno = ADD48(DCCP_SKB_CB(rxskb)->dccpd_ack_seq, 1);
340
341         dccp_hdr_set_seq(dh, seqno);
342         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), DCCP_SKB_CB(rxskb)->dccpd_seq);
343
344         dccp_csum_outgoing(skb);
345         rxip6h = ipv6_hdr(rxskb);
346         dh->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
347                                                       &rxip6h->daddr);
348
349         memset(&fl, 0, sizeof(fl));
350         ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
351         ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
352
353         fl.proto = IPPROTO_DCCP;
354         fl.oif = inet6_iif(rxskb);
355         fl.fl_ip_dport = dh->dccph_dport;
356         fl.fl_ip_sport = dh->dccph_sport;
357         security_skb_classify_flow(rxskb, &fl);
358
359         /* sk = NULL, but it is safe for now. RST socket required. */
360         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
361                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
362                         ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
363                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
364                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
365                         return;
366                 }
367         }
368
369         kfree_skb(skb);
370 }
371
372 static struct request_sock_ops dccp6_request_sock_ops = {
373         .family         = AF_INET6,
374         .obj_size       = sizeof(struct dccp6_request_sock),
375         .rtx_syn_ack    = dccp_v6_send_response,
376         .send_ack       = dccp_reqsk_send_ack,
377         .destructor     = dccp_v6_reqsk_destructor,
378         .send_reset     = dccp_v6_ctl_send_reset,
379 };
380
381 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
382 {
383         const struct dccp_hdr *dh = dccp_hdr(skb);
384         const struct ipv6hdr *iph = ipv6_hdr(skb);
385         struct sock *nsk;
386         struct request_sock **prev;
387         /* Find possible connection requests. */
388         struct request_sock *req = inet6_csk_search_req(sk, &prev,
389                                                         dh->dccph_sport,
390                                                         &iph->saddr,
391                                                         &iph->daddr,
392                                                         inet6_iif(skb));
393         if (req != NULL)
394                 return dccp_check_req(sk, skb, req, prev);
395
396         nsk = __inet6_lookup_established(&dccp_hashinfo,
397                                          &iph->saddr, dh->dccph_sport,
398                                          &iph->daddr, ntohs(dh->dccph_dport),
399                                          inet6_iif(skb));
400         if (nsk != NULL) {
401                 if (nsk->sk_state != DCCP_TIME_WAIT) {
402                         bh_lock_sock(nsk);
403                         return nsk;
404                 }
405                 inet_twsk_put(inet_twsk(nsk));
406                 return NULL;
407         }
408
409         return sk;
410 }
411
412 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
413 {
414         struct request_sock *req;
415         struct dccp_request_sock *dreq;
416         struct inet6_request_sock *ireq6;
417         struct ipv6_pinfo *np = inet6_sk(sk);
418         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
419         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
420         __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
421
422         if (skb->protocol == htons(ETH_P_IP))
423                 return dccp_v4_conn_request(sk, skb);
424
425         if (!ipv6_unicast_destination(skb))
426                 goto drop;
427
428         if (dccp_bad_service_code(sk, service)) {
429                 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
430                 goto drop;
431         }
432         /*
433          * There are no SYN attacks on IPv6, yet...
434          */
435         if (inet_csk_reqsk_queue_is_full(sk))
436                 goto drop;
437
438         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
439                 goto drop;
440
441         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
442         if (req == NULL)
443                 goto drop;
444
445         if (dccp_parse_options(sk, skb))
446                 goto drop_and_free;
447
448         dccp_reqsk_init(req, skb);
449
450         if (security_inet_conn_request(sk, skb, req))
451                 goto drop_and_free;
452
453         ireq6 = inet6_rsk(req);
454         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
455         ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
456         ireq6->pktopts  = NULL;
457
458         if (ipv6_opt_accepted(sk, skb) ||
459             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
460             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
461                 atomic_inc(&skb->users);
462                 ireq6->pktopts = skb;
463         }
464         ireq6->iif = sk->sk_bound_dev_if;
465
466         /* So that link locals have meaning */
467         if (!sk->sk_bound_dev_if &&
468             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
469                 ireq6->iif = inet6_iif(skb);
470
471         /*
472          * Step 3: Process LISTEN state
473          *
474          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
475          *
476          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
477          *   dccp_create_openreq_child.
478          */
479         dreq = dccp_rsk(req);
480         dreq->dreq_isr     = dcb->dccpd_seq;
481         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
482         dreq->dreq_service = service;
483
484         if (dccp_v6_send_response(sk, req, NULL))
485                 goto drop_and_free;
486
487         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
488         return 0;
489
490 drop_and_free:
491         reqsk_free(req);
492 drop:
493         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
494         dcb->dccpd_reset_code = reset_code;
495         return -1;
496 }
497
498 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
499                                               struct sk_buff *skb,
500                                               struct request_sock *req,
501                                               struct dst_entry *dst)
502 {
503         struct inet6_request_sock *ireq6 = inet6_rsk(req);
504         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
505         struct inet_sock *newinet;
506         struct dccp_sock *newdp;
507         struct dccp6_sock *newdp6;
508         struct sock *newsk;
509         struct ipv6_txoptions *opt;
510
511         if (skb->protocol == htons(ETH_P_IP)) {
512                 /*
513                  *      v6 mapped
514                  */
515                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
516                 if (newsk == NULL)
517                         return NULL;
518
519                 newdp6 = (struct dccp6_sock *)newsk;
520                 newdp = dccp_sk(newsk);
521                 newinet = inet_sk(newsk);
522                 newinet->pinet6 = &newdp6->inet6;
523                 newnp = inet6_sk(newsk);
524
525                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
526
527                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
528                               newinet->daddr);
529
530                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
531                               newinet->saddr);
532
533                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
534
535                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
536                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
537                 newnp->pktoptions  = NULL;
538                 newnp->opt         = NULL;
539                 newnp->mcast_oif   = inet6_iif(skb);
540                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
541
542                 /*
543                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
544                  * here, dccp_create_openreq_child now does this for us, see the comment in
545                  * that function for the gory details. -acme
546                  */
547
548                 /* It is tricky place. Until this moment IPv4 tcp
549                    worked with IPv6 icsk.icsk_af_ops.
550                    Sync it now.
551                  */
552                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
553
554                 return newsk;
555         }
556
557         opt = np->opt;
558
559         if (sk_acceptq_is_full(sk))
560                 goto out_overflow;
561
562         if (dst == NULL) {
563                 struct in6_addr *final_p = NULL, final;
564                 struct flowi fl;
565
566                 memset(&fl, 0, sizeof(fl));
567                 fl.proto = IPPROTO_DCCP;
568                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
569                 if (opt != NULL && opt->srcrt != NULL) {
570                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
571
572                         ipv6_addr_copy(&final, &fl.fl6_dst);
573                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
574                         final_p = &final;
575                 }
576                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
577                 fl.oif = sk->sk_bound_dev_if;
578                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
579                 fl.fl_ip_sport = inet_sk(sk)->sport;
580                 security_sk_classify_flow(sk, &fl);
581
582                 if (ip6_dst_lookup(sk, &dst, &fl))
583                         goto out;
584
585                 if (final_p)
586                         ipv6_addr_copy(&fl.fl6_dst, final_p);
587
588                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
589                         goto out;
590         }
591
592         newsk = dccp_create_openreq_child(sk, req, skb);
593         if (newsk == NULL)
594                 goto out;
595
596         /*
597          * No need to charge this sock to the relevant IPv6 refcnt debug socks
598          * count here, dccp_create_openreq_child now does this for us, see the
599          * comment in that function for the gory details. -acme
600          */
601
602         __ip6_dst_store(newsk, dst, NULL, NULL);
603         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
604                                                       NETIF_F_TSO);
605         newdp6 = (struct dccp6_sock *)newsk;
606         newinet = inet_sk(newsk);
607         newinet->pinet6 = &newdp6->inet6;
608         newdp = dccp_sk(newsk);
609         newnp = inet6_sk(newsk);
610
611         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
612
613         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
614         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
615         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
616         newsk->sk_bound_dev_if = ireq6->iif;
617
618         /* Now IPv6 options...
619
620            First: no IPv4 options.
621          */
622         newinet->opt = NULL;
623
624         /* Clone RX bits */
625         newnp->rxopt.all = np->rxopt.all;
626
627         /* Clone pktoptions received with SYN */
628         newnp->pktoptions = NULL;
629         if (ireq6->pktopts != NULL) {
630                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
631                 kfree_skb(ireq6->pktopts);
632                 ireq6->pktopts = NULL;
633                 if (newnp->pktoptions)
634                         skb_set_owner_r(newnp->pktoptions, newsk);
635         }
636         newnp->opt        = NULL;
637         newnp->mcast_oif  = inet6_iif(skb);
638         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
639
640         /*
641          * Clone native IPv6 options from listening socket (if any)
642          *
643          * Yes, keeping reference count would be much more clever, but we make
644          * one more one thing there: reattach optmem to newsk.
645          */
646         if (opt != NULL) {
647                 newnp->opt = ipv6_dup_options(newsk, opt);
648                 if (opt != np->opt)
649                         sock_kfree_s(sk, opt, opt->tot_len);
650         }
651
652         inet_csk(newsk)->icsk_ext_hdr_len = 0;
653         if (newnp->opt != NULL)
654                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
655                                                      newnp->opt->opt_flen);
656
657         dccp_sync_mss(newsk, dst_mtu(dst));
658
659         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
660
661         __inet6_hash(&dccp_hashinfo, newsk);
662         inet_inherit_port(&dccp_hashinfo, sk, newsk);
663
664         return newsk;
665
666 out_overflow:
667         NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
668 out:
669         NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
670         if (opt != NULL && opt != np->opt)
671                 sock_kfree_s(sk, opt, opt->tot_len);
672         dst_release(dst);
673         return NULL;
674 }
675
676 /* The socket must have it's spinlock held when we get
677  * here.
678  *
679  * We have a potential double-lock case here, so even when
680  * doing backlog processing we use the BH locking scheme.
681  * This is because we cannot sleep with the original spinlock
682  * held.
683  */
684 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
685 {
686         struct ipv6_pinfo *np = inet6_sk(sk);
687         struct sk_buff *opt_skb = NULL;
688
689         /* Imagine: socket is IPv6. IPv4 packet arrives,
690            goes to IPv4 receive handler and backlogged.
691            From backlog it always goes here. Kerboom...
692            Fortunately, dccp_rcv_established and rcv_established
693            handle them correctly, but it is not case with
694            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
695          */
696
697         if (skb->protocol == htons(ETH_P_IP))
698                 return dccp_v4_do_rcv(sk, skb);
699
700         if (sk_filter(sk, skb))
701                 goto discard;
702
703         /*
704          * socket locking is here for SMP purposes as backlog rcv is currently
705          * called with bh processing disabled.
706          */
707
708         /* Do Stevens' IPV6_PKTOPTIONS.
709
710            Yes, guys, it is the only place in our code, where we
711            may make it not affecting IPv4.
712            The rest of code is protocol independent,
713            and I do not like idea to uglify IPv4.
714
715            Actually, all the idea behind IPV6_PKTOPTIONS
716            looks not very well thought. For now we latch
717            options, received in the last packet, enqueued
718            by tcp. Feel free to propose better solution.
719                                                --ANK (980728)
720          */
721         if (np->rxopt.all)
722         /*
723          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
724          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
725          */
726                 opt_skb = skb_clone(skb, GFP_ATOMIC);
727
728         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
729                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
730                         goto reset;
731                 if (opt_skb) {
732                         /* XXX This is where we would goto ipv6_pktoptions. */
733                         __kfree_skb(opt_skb);
734                 }
735                 return 0;
736         }
737
738         /*
739          *  Step 3: Process LISTEN state
740          *     If S.state == LISTEN,
741          *       If P.type == Request or P contains a valid Init Cookie option,
742          *            (* Must scan the packet's options to check for Init
743          *               Cookies.  Only Init Cookies are processed here,
744          *               however; other options are processed in Step 8.  This
745          *               scan need only be performed if the endpoint uses Init
746          *               Cookies *)
747          *            (* Generate a new socket and switch to that socket *)
748          *            Set S := new socket for this port pair
749          *            S.state = RESPOND
750          *            Choose S.ISS (initial seqno) or set from Init Cookies
751          *            Initialize S.GAR := S.ISS
752          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
753          *            Continue with S.state == RESPOND
754          *            (* A Response packet will be generated in Step 11 *)
755          *       Otherwise,
756          *            Generate Reset(No Connection) unless P.type == Reset
757          *            Drop packet and return
758          *
759          * NOTE: the check for the packet types is done in
760          *       dccp_rcv_state_process
761          */
762         if (sk->sk_state == DCCP_LISTEN) {
763                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
764
765                 if (nsk == NULL)
766                         goto discard;
767                 /*
768                  * Queue it on the new socket if the new socket is active,
769                  * otherwise we just shortcircuit this and continue with
770                  * the new socket..
771                  */
772                 if (nsk != sk) {
773                         if (dccp_child_process(sk, nsk, skb))
774                                 goto reset;
775                         if (opt_skb != NULL)
776                                 __kfree_skb(opt_skb);
777                         return 0;
778                 }
779         }
780
781         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
782                 goto reset;
783         if (opt_skb) {
784                 /* XXX This is where we would goto ipv6_pktoptions. */
785                 __kfree_skb(opt_skb);
786         }
787         return 0;
788
789 reset:
790         dccp_v6_ctl_send_reset(sk, skb);
791 discard:
792         if (opt_skb != NULL)
793                 __kfree_skb(opt_skb);
794         kfree_skb(skb);
795         return 0;
796 }
797
798 static int dccp_v6_rcv(struct sk_buff **pskb)
799 {
800         const struct dccp_hdr *dh;
801         struct sk_buff *skb = *pskb;
802         struct sock *sk;
803         int min_cov;
804
805         /* Step 1: Check header basics */
806
807         if (dccp_invalid_packet(skb))
808                 goto discard_it;
809
810         /* Step 1: If header checksum is incorrect, drop packet and return. */
811         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
812                                      &ipv6_hdr(skb)->daddr)) {
813                 DCCP_WARN("dropped packet with invalid checksum\n");
814                 goto discard_it;
815         }
816
817         dh = dccp_hdr(skb);
818
819         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(skb);
820         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
821
822         if (dccp_packet_without_ack(skb))
823                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
824         else
825                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
826
827         /* Step 2:
828          *      Look up flow ID in table and get corresponding socket */
829         sk = __inet6_lookup(&dccp_hashinfo, &ipv6_hdr(skb)->saddr,
830                             dh->dccph_sport,
831                             &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
832                             inet6_iif(skb));
833         /*
834          * Step 2:
835          *      If no socket ...
836          */
837         if (sk == NULL) {
838                 dccp_pr_debug("failed to look up flow ID in table and "
839                               "get corresponding socket\n");
840                 goto no_dccp_socket;
841         }
842
843         /*
844          * Step 2:
845          *      ... or S.state == TIMEWAIT,
846          *              Generate Reset(No Connection) unless P.type == Reset
847          *              Drop packet and return
848          */
849         if (sk->sk_state == DCCP_TIME_WAIT) {
850                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
851                 inet_twsk_put(inet_twsk(sk));
852                 goto no_dccp_socket;
853         }
854
855         /*
856          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
857          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
858          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
859          */
860         min_cov = dccp_sk(sk)->dccps_pcrlen;
861         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
862                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
863                               dh->dccph_cscov, min_cov);
864                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
865                 goto discard_and_relse;
866         }
867
868         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
869                 goto discard_and_relse;
870
871         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
872
873 no_dccp_socket:
874         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
875                 goto discard_it;
876         /*
877          * Step 2:
878          *      If no socket ...
879          *              Generate Reset(No Connection) unless P.type == Reset
880          *              Drop packet and return
881          */
882         if (dh->dccph_type != DCCP_PKT_RESET) {
883                 DCCP_SKB_CB(skb)->dccpd_reset_code =
884                                         DCCP_RESET_CODE_NO_CONNECTION;
885                 dccp_v6_ctl_send_reset(sk, skb);
886         }
887
888 discard_it:
889         kfree_skb(skb);
890         return 0;
891
892 discard_and_relse:
893         sock_put(sk);
894         goto discard_it;
895 }
896
897 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
898                            int addr_len)
899 {
900         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
901         struct inet_connection_sock *icsk = inet_csk(sk);
902         struct inet_sock *inet = inet_sk(sk);
903         struct ipv6_pinfo *np = inet6_sk(sk);
904         struct dccp_sock *dp = dccp_sk(sk);
905         struct in6_addr *saddr = NULL, *final_p = NULL, final;
906         struct flowi fl;
907         struct dst_entry *dst;
908         int addr_type;
909         int err;
910
911         dp->dccps_role = DCCP_ROLE_CLIENT;
912
913         if (addr_len < SIN6_LEN_RFC2133)
914                 return -EINVAL;
915
916         if (usin->sin6_family != AF_INET6)
917                 return -EAFNOSUPPORT;
918
919         memset(&fl, 0, sizeof(fl));
920
921         if (np->sndflow) {
922                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
923                 IP6_ECN_flow_init(fl.fl6_flowlabel);
924                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
925                         struct ip6_flowlabel *flowlabel;
926                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
927                         if (flowlabel == NULL)
928                                 return -EINVAL;
929                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
930                         fl6_sock_release(flowlabel);
931                 }
932         }
933         /*
934          * connect() to INADDR_ANY means loopback (BSD'ism).
935          */
936         if (ipv6_addr_any(&usin->sin6_addr))
937                 usin->sin6_addr.s6_addr[15] = 1;
938
939         addr_type = ipv6_addr_type(&usin->sin6_addr);
940
941         if (addr_type & IPV6_ADDR_MULTICAST)
942                 return -ENETUNREACH;
943
944         if (addr_type & IPV6_ADDR_LINKLOCAL) {
945                 if (addr_len >= sizeof(struct sockaddr_in6) &&
946                     usin->sin6_scope_id) {
947                         /* If interface is set while binding, indices
948                          * must coincide.
949                          */
950                         if (sk->sk_bound_dev_if &&
951                             sk->sk_bound_dev_if != usin->sin6_scope_id)
952                                 return -EINVAL;
953
954                         sk->sk_bound_dev_if = usin->sin6_scope_id;
955                 }
956
957                 /* Connect to link-local address requires an interface */
958                 if (!sk->sk_bound_dev_if)
959                         return -EINVAL;
960         }
961
962         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
963         np->flow_label = fl.fl6_flowlabel;
964
965         /*
966          * DCCP over IPv4
967          */
968         if (addr_type == IPV6_ADDR_MAPPED) {
969                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
970                 struct sockaddr_in sin;
971
972                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
973
974                 if (__ipv6_only_sock(sk))
975                         return -ENETUNREACH;
976
977                 sin.sin_family = AF_INET;
978                 sin.sin_port = usin->sin6_port;
979                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
980
981                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
982                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
983
984                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
985                 if (err) {
986                         icsk->icsk_ext_hdr_len = exthdrlen;
987                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
988                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
989                         goto failure;
990                 } else {
991                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
992                                       inet->saddr);
993                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
994                                       inet->rcv_saddr);
995                 }
996
997                 return err;
998         }
999
1000         if (!ipv6_addr_any(&np->rcv_saddr))
1001                 saddr = &np->rcv_saddr;
1002
1003         fl.proto = IPPROTO_DCCP;
1004         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
1005         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
1006         fl.oif = sk->sk_bound_dev_if;
1007         fl.fl_ip_dport = usin->sin6_port;
1008         fl.fl_ip_sport = inet->sport;
1009         security_sk_classify_flow(sk, &fl);
1010
1011         if (np->opt != NULL && np->opt->srcrt != NULL) {
1012                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
1013
1014                 ipv6_addr_copy(&final, &fl.fl6_dst);
1015                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1016                 final_p = &final;
1017         }
1018
1019         err = ip6_dst_lookup(sk, &dst, &fl);
1020         if (err)
1021                 goto failure;
1022
1023         if (final_p)
1024                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1025
1026         err = __xfrm_lookup(&dst, &fl, sk, 1);
1027         if (err < 0) {
1028                 if (err == -EREMOTE)
1029                         err = ip6_dst_blackhole(sk, &dst, &fl);
1030                 if (err < 0)
1031                         goto failure;
1032         }
1033
1034         if (saddr == NULL) {
1035                 saddr = &fl.fl6_src;
1036                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1037         }
1038
1039         /* set the source address */
1040         ipv6_addr_copy(&np->saddr, saddr);
1041         inet->rcv_saddr = LOOPBACK4_IPV6;
1042
1043         __ip6_dst_store(sk, dst, NULL, NULL);
1044
1045         icsk->icsk_ext_hdr_len = 0;
1046         if (np->opt != NULL)
1047                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1048                                           np->opt->opt_nflen);
1049
1050         inet->dport = usin->sin6_port;
1051
1052         dccp_set_state(sk, DCCP_REQUESTING);
1053         err = inet6_hash_connect(&dccp_death_row, sk);
1054         if (err)
1055                 goto late_failure;
1056
1057         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1058                                                       np->daddr.s6_addr32,
1059                                                       inet->sport, inet->dport);
1060         err = dccp_connect(sk);
1061         if (err)
1062                 goto late_failure;
1063
1064         return 0;
1065
1066 late_failure:
1067         dccp_set_state(sk, DCCP_CLOSED);
1068         __sk_dst_reset(sk);
1069 failure:
1070         inet->dport = 0;
1071         sk->sk_route_caps = 0;
1072         return err;
1073 }
1074
1075 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1076         .queue_xmit        = inet6_csk_xmit,
1077         .send_check        = dccp_v6_send_check,
1078         .rebuild_header    = inet6_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 ipv6hdr),
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 /*
1093  *      DCCP over IPv4 via INET6 API
1094  */
1095 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1096         .queue_xmit        = ip_queue_xmit,
1097         .send_check        = dccp_v4_send_check,
1098         .rebuild_header    = inet_sk_rebuild_header,
1099         .conn_request      = dccp_v6_conn_request,
1100         .syn_recv_sock     = dccp_v6_request_recv_sock,
1101         .net_header_len    = sizeof(struct iphdr),
1102         .setsockopt        = ipv6_setsockopt,
1103         .getsockopt        = ipv6_getsockopt,
1104         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1105         .sockaddr_len      = sizeof(struct sockaddr_in6),
1106 #ifdef CONFIG_COMPAT
1107         .compat_setsockopt = compat_ipv6_setsockopt,
1108         .compat_getsockopt = compat_ipv6_getsockopt,
1109 #endif
1110 };
1111
1112 /* NOTE: A lot of things set to zero explicitly by call to
1113  *       sk_alloc() so need not be done here.
1114  */
1115 static int dccp_v6_init_sock(struct sock *sk)
1116 {
1117         static __u8 dccp_v6_ctl_sock_initialized;
1118         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1119
1120         if (err == 0) {
1121                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1122                         dccp_v6_ctl_sock_initialized = 1;
1123                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1124         }
1125
1126         return err;
1127 }
1128
1129 static int dccp_v6_destroy_sock(struct sock *sk)
1130 {
1131         dccp_destroy_sock(sk);
1132         return inet6_destroy_sock(sk);
1133 }
1134
1135 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1136         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1137 };
1138
1139 static struct proto dccp_v6_prot = {
1140         .name              = "DCCPv6",
1141         .owner             = THIS_MODULE,
1142         .close             = dccp_close,
1143         .connect           = dccp_v6_connect,
1144         .disconnect        = dccp_disconnect,
1145         .ioctl             = dccp_ioctl,
1146         .init              = dccp_v6_init_sock,
1147         .setsockopt        = dccp_setsockopt,
1148         .getsockopt        = dccp_getsockopt,
1149         .sendmsg           = dccp_sendmsg,
1150         .recvmsg           = dccp_recvmsg,
1151         .backlog_rcv       = dccp_v6_do_rcv,
1152         .hash              = dccp_v6_hash,
1153         .unhash            = dccp_unhash,
1154         .accept            = inet_csk_accept,
1155         .get_port          = dccp_v6_get_port,
1156         .shutdown          = dccp_shutdown,
1157         .destroy           = dccp_v6_destroy_sock,
1158         .orphan_count      = &dccp_orphan_count,
1159         .max_header        = MAX_DCCP_HEADER,
1160         .obj_size          = sizeof(struct dccp6_sock),
1161         .rsk_prot          = &dccp6_request_sock_ops,
1162         .twsk_prot         = &dccp6_timewait_sock_ops,
1163 #ifdef CONFIG_COMPAT
1164         .compat_setsockopt = compat_dccp_setsockopt,
1165         .compat_getsockopt = compat_dccp_getsockopt,
1166 #endif
1167 };
1168
1169 static struct inet6_protocol dccp_v6_protocol = {
1170         .handler        = dccp_v6_rcv,
1171         .err_handler    = dccp_v6_err,
1172         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1173 };
1174
1175 static struct proto_ops inet6_dccp_ops = {
1176         .family            = PF_INET6,
1177         .owner             = THIS_MODULE,
1178         .release           = inet6_release,
1179         .bind              = inet6_bind,
1180         .connect           = inet_stream_connect,
1181         .socketpair        = sock_no_socketpair,
1182         .accept            = inet_accept,
1183         .getname           = inet6_getname,
1184         .poll              = dccp_poll,
1185         .ioctl             = inet6_ioctl,
1186         .listen            = inet_dccp_listen,
1187         .shutdown          = inet_shutdown,
1188         .setsockopt        = sock_common_setsockopt,
1189         .getsockopt        = sock_common_getsockopt,
1190         .sendmsg           = inet_sendmsg,
1191         .recvmsg           = sock_common_recvmsg,
1192         .mmap              = sock_no_mmap,
1193         .sendpage          = sock_no_sendpage,
1194 #ifdef CONFIG_COMPAT
1195         .compat_setsockopt = compat_sock_common_setsockopt,
1196         .compat_getsockopt = compat_sock_common_getsockopt,
1197 #endif
1198 };
1199
1200 static struct inet_protosw dccp_v6_protosw = {
1201         .type           = SOCK_DCCP,
1202         .protocol       = IPPROTO_DCCP,
1203         .prot           = &dccp_v6_prot,
1204         .ops            = &inet6_dccp_ops,
1205         .capability     = -1,
1206         .flags          = INET_PROTOSW_ICSK,
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 = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1223                                        SOCK_DCCP, IPPROTO_DCCP);
1224         if (err != 0)
1225                 goto out_unregister_protosw;
1226 out:
1227         return err;
1228 out_unregister_protosw:
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         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1239         inet6_unregister_protosw(&dccp_v6_protosw);
1240         proto_unregister(&dccp_v6_prot);
1241 }
1242
1243 module_init(dccp_v6_init);
1244 module_exit(dccp_v6_exit);
1245
1246 /*
1247  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1248  * values directly, Also cover the case where the protocol is not specified,
1249  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1250  */
1251 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1252 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1253 MODULE_LICENSE("GPL");
1254 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1255 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");