[DCCP]: Support for partial checksums (RFC 4340, sec. 9.2)
[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 u16 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 __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
80 {
81         const struct dccp_hdr *dh = dccp_hdr(skb);
82
83         if (skb->protocol == htons(ETH_P_IPV6))
84                 return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
85                                                     skb->nh.ipv6h->saddr.s6_addr32,
86                                                     dh->dccph_dport,
87                                                     dh->dccph_sport);
88
89         return secure_dccp_sequence_number(skb->nh.iph->daddr,
90                                            skb->nh.iph->saddr,
91                                            dh->dccph_dport,
92                                            dh->dccph_sport);
93 }
94
95 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
96                         int type, int code, int offset, __be32 info)
97 {
98         struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
99         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
100         struct ipv6_pinfo *np;
101         struct sock *sk;
102         int err;
103         __u64 seq;
104
105         sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
106                           &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
107
108         if (sk == NULL) {
109                 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
110                 return;
111         }
112
113         if (sk->sk_state == DCCP_TIME_WAIT) {
114                 inet_twsk_put(inet_twsk(sk));
115                 return;
116         }
117
118         bh_lock_sock(sk);
119         if (sock_owned_by_user(sk))
120                 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
121
122         if (sk->sk_state == DCCP_CLOSED)
123                 goto out;
124
125         np = inet6_sk(sk);
126
127         if (type == ICMPV6_PKT_TOOBIG) {
128                 struct dst_entry *dst = NULL;
129
130                 if (sock_owned_by_user(sk))
131                         goto out;
132                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
133                         goto out;
134
135                 /* icmp should have updated the destination cache entry */
136                 dst = __sk_dst_check(sk, np->dst_cookie);
137                 if (dst == NULL) {
138                         struct inet_sock *inet = inet_sk(sk);
139                         struct flowi fl;
140
141                         /* BUGGG_FUTURE: Again, it is not clear how
142                            to handle rthdr case. Ignore this complexity
143                            for now.
144                          */
145                         memset(&fl, 0, sizeof(fl));
146                         fl.proto = IPPROTO_DCCP;
147                         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
148                         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
149                         fl.oif = sk->sk_bound_dev_if;
150                         fl.fl_ip_dport = inet->dport;
151                         fl.fl_ip_sport = inet->sport;
152                         security_sk_classify_flow(sk, &fl);
153
154                         err = ip6_dst_lookup(sk, &dst, &fl);
155                         if (err) {
156                                 sk->sk_err_soft = -err;
157                                 goto out;
158                         }
159
160                         err = xfrm_lookup(&dst, &fl, sk, 0);
161                         if (err < 0) {
162                                 sk->sk_err_soft = -err;
163                                 goto out;
164                         }
165                 } else
166                         dst_hold(dst);
167
168                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
169                         dccp_sync_mss(sk, dst_mtu(dst));
170                 } /* else let the usual retransmit timer handle it */
171                 dst_release(dst);
172                 goto out;
173         }
174
175         icmpv6_err_convert(type, code, &err);
176
177         seq = DCCP_SKB_CB(skb)->dccpd_seq;
178         /* Might be for an request_sock */
179         switch (sk->sk_state) {
180                 struct request_sock *req, **prev;
181         case DCCP_LISTEN:
182                 if (sock_owned_by_user(sk))
183                         goto out;
184
185                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
186                                            &hdr->daddr, &hdr->saddr,
187                                            inet6_iif(skb));
188                 if (req == NULL)
189                         goto out;
190
191                 /*
192                  * ICMPs are not backlogged, hence we cannot get an established
193                  * socket here.
194                  */
195                 BUG_TRAP(req->sk == NULL);
196
197                 if (seq != dccp_rsk(req)->dreq_iss) {
198                         NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
199                         goto out;
200                 }
201
202                 inet_csk_reqsk_queue_drop(sk, req, prev);
203                 goto out;
204
205         case DCCP_REQUESTING:
206         case DCCP_RESPOND:  /* Cannot happen.
207                                It can, it SYNs are crossed. --ANK */
208                 if (!sock_owned_by_user(sk)) {
209                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
210                         sk->sk_err = err;
211                         /*
212                          * Wake people up to see the error
213                          * (see connect in sock.c)
214                          */
215                         sk->sk_error_report(sk);
216                         dccp_done(sk);
217                 } else
218                         sk->sk_err_soft = err;
219                 goto out;
220         }
221
222         if (!sock_owned_by_user(sk) && np->recverr) {
223                 sk->sk_err = err;
224                 sk->sk_error_report(sk);
225         } else
226                 sk->sk_err_soft = err;
227
228 out:
229         bh_unlock_sock(sk);
230         sock_put(sk);
231 }
232
233
234 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
235                                  struct dst_entry *dst)
236 {
237         struct inet6_request_sock *ireq6 = inet6_rsk(req);
238         struct ipv6_pinfo *np = inet6_sk(sk);
239         struct sk_buff *skb;
240         struct ipv6_txoptions *opt = NULL;
241         struct in6_addr *final_p = NULL, final;
242         struct flowi fl;
243         int err = -1;
244
245         memset(&fl, 0, sizeof(fl));
246         fl.proto = IPPROTO_DCCP;
247         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
248         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
249         fl.fl6_flowlabel = 0;
250         fl.oif = ireq6->iif;
251         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
252         fl.fl_ip_sport = inet_sk(sk)->sport;
253         security_req_classify_flow(req, &fl);
254
255         if (dst == NULL) {
256                 opt = np->opt;
257                 if (opt == NULL &&
258                     np->rxopt.bits.osrcrt == 2 &&
259                     ireq6->pktopts) {
260                         struct sk_buff *pktopts = ireq6->pktopts;
261                         struct inet6_skb_parm *rxopt = IP6CB(pktopts);
262
263                         if (rxopt->srcrt)
264                                 opt = ipv6_invert_rthdr(sk,
265                                         (struct ipv6_rt_hdr *)(pktopts->nh.raw +
266                                                                rxopt->srcrt));
267                 }
268
269                 if (opt != NULL && opt->srcrt != NULL) {
270                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
271
272                         ipv6_addr_copy(&final, &fl.fl6_dst);
273                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
274                         final_p = &final;
275                 }
276
277                 err = ip6_dst_lookup(sk, &dst, &fl);
278                 if (err)
279                         goto done;
280
281                 if (final_p)
282                         ipv6_addr_copy(&fl.fl6_dst, final_p);
283
284                 err = xfrm_lookup(&dst, &fl, sk, 0);
285                 if (err < 0)
286                         goto done;
287         }
288
289         skb = dccp_make_response(sk, dst, req);
290         if (skb != NULL) {
291                 struct dccp_hdr *dh = dccp_hdr(skb);
292
293                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
294                                                          &ireq6->loc_addr,
295                                                          &ireq6->rmt_addr);
296                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
297                 err = ip6_xmit(sk, skb, &fl, opt, 0);
298                 if (err == NET_XMIT_CN)
299                         err = 0;
300         }
301
302 done:
303         if (opt != NULL && opt != np->opt)
304                 sock_kfree_s(sk, opt, opt->tot_len);
305         dst_release(dst);
306         return err;
307 }
308
309 static void dccp_v6_reqsk_destructor(struct request_sock *req)
310 {
311         if (inet6_rsk(req)->pktopts != NULL)
312                 kfree_skb(inet6_rsk(req)->pktopts);
313 }
314
315 static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
316 {
317         struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
318         const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
319                                        sizeof(struct dccp_hdr_ext) +
320                                        sizeof(struct dccp_hdr_reset);
321         struct sk_buff *skb;
322         struct flowi fl;
323         u64 seqno;
324
325         if (rxdh->dccph_type == DCCP_PKT_RESET)
326                 return;
327
328         if (!ipv6_unicast_destination(rxskb))
329                 return;
330
331         skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
332                         GFP_ATOMIC);
333         if (skb == NULL)
334                 return;
335
336         skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
337
338         dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len);
339
340         /* Swap the send and the receive. */
341         dh->dccph_type  = DCCP_PKT_RESET;
342         dh->dccph_sport = rxdh->dccph_dport;
343         dh->dccph_dport = rxdh->dccph_sport;
344         dh->dccph_doff  = dccp_hdr_reset_len / 4;
345         dh->dccph_x     = 1;
346         dccp_hdr_reset(skb)->dccph_reset_code =
347                                 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
348
349         /* See "8.3.1. Abnormal Termination" in RFC 4340 */
350         seqno = 0;
351         if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
352                 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
353
354         dccp_hdr_set_seq(dh, seqno);
355         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
356                          DCCP_SKB_CB(rxskb)->dccpd_seq);
357
358         dccp_csum_outgoing(skb);
359         dh->dccph_checksum = dccp_v6_csum_finish(skb, &rxskb->nh.ipv6h->saddr,
360                                                       &rxskb->nh.ipv6h->daddr);
361
362         memset(&fl, 0, sizeof(fl));
363         ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
364         ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
365
366         fl.proto = IPPROTO_DCCP;
367         fl.oif = inet6_iif(rxskb);
368         fl.fl_ip_dport = dh->dccph_dport;
369         fl.fl_ip_sport = dh->dccph_sport;
370         security_skb_classify_flow(rxskb, &fl);
371
372         /* sk = NULL, but it is safe for now. RST socket required. */
373         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
374                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
375                         ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
376                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
377                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
378                         return;
379                 }
380         }
381
382         kfree_skb(skb);
383 }
384
385 static struct request_sock_ops dccp6_request_sock_ops = {
386         .family         = AF_INET6,
387         .obj_size       = sizeof(struct dccp6_request_sock),
388         .rtx_syn_ack    = dccp_v6_send_response,
389         .send_ack       = dccp_reqsk_send_ack,
390         .destructor     = dccp_v6_reqsk_destructor,
391         .send_reset     = dccp_v6_ctl_send_reset,
392 };
393
394 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
395 {
396         const struct dccp_hdr *dh = dccp_hdr(skb);
397         const struct ipv6hdr *iph = skb->nh.ipv6h;
398         struct sock *nsk;
399         struct request_sock **prev;
400         /* Find possible connection requests. */
401         struct request_sock *req = inet6_csk_search_req(sk, &prev,
402                                                         dh->dccph_sport,
403                                                         &iph->saddr,
404                                                         &iph->daddr,
405                                                         inet6_iif(skb));
406         if (req != NULL)
407                 return dccp_check_req(sk, skb, req, prev);
408
409         nsk = __inet6_lookup_established(&dccp_hashinfo,
410                                          &iph->saddr, dh->dccph_sport,
411                                          &iph->daddr, ntohs(dh->dccph_dport),
412                                          inet6_iif(skb));
413         if (nsk != NULL) {
414                 if (nsk->sk_state != DCCP_TIME_WAIT) {
415                         bh_lock_sock(nsk);
416                         return nsk;
417                 }
418                 inet_twsk_put(inet_twsk(nsk));
419                 return NULL;
420         }
421
422         return sk;
423 }
424
425 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
426 {
427         struct request_sock *req;
428         struct dccp_request_sock *dreq;
429         struct inet6_request_sock *ireq6;
430         struct ipv6_pinfo *np = inet6_sk(sk);
431         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
432         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
433         __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
434
435         if (skb->protocol == htons(ETH_P_IP))
436                 return dccp_v4_conn_request(sk, skb);
437
438         if (!ipv6_unicast_destination(skb))
439                 goto drop;
440
441         if (dccp_bad_service_code(sk, service)) {
442                 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
443                 goto drop;
444         }
445         /*
446          * There are no SYN attacks on IPv6, yet...
447          */
448         if (inet_csk_reqsk_queue_is_full(sk))
449                 goto drop;
450
451         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
452                 goto drop;
453
454         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
455         if (req == NULL)
456                 goto drop;
457
458         if (dccp_parse_options(sk, skb))
459                 goto drop_and_free;
460
461         dccp_reqsk_init(req, skb);
462
463         if (security_inet_conn_request(sk, skb, req))
464                 goto drop_and_free;
465
466         ireq6 = inet6_rsk(req);
467         ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
468         ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
469         ireq6->pktopts  = NULL;
470
471         if (ipv6_opt_accepted(sk, skb) ||
472             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
473             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
474                 atomic_inc(&skb->users);
475                 ireq6->pktopts = skb;
476         }
477         ireq6->iif = sk->sk_bound_dev_if;
478
479         /* So that link locals have meaning */
480         if (!sk->sk_bound_dev_if &&
481             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
482                 ireq6->iif = inet6_iif(skb);
483
484         /*
485          * Step 3: Process LISTEN state
486          *
487          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
488          *
489          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
490          *   dccp_create_openreq_child.
491          */
492         dreq = dccp_rsk(req);
493         dreq->dreq_isr     = dcb->dccpd_seq;
494         dreq->dreq_iss     = dccp_v6_init_sequence(sk, skb);
495         dreq->dreq_service = service;
496
497         if (dccp_v6_send_response(sk, req, NULL))
498                 goto drop_and_free;
499
500         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
501         return 0;
502
503 drop_and_free:
504         reqsk_free(req);
505 drop:
506         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
507         dcb->dccpd_reset_code = reset_code;
508         return -1;
509 }
510
511 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
512                                               struct sk_buff *skb,
513                                               struct request_sock *req,
514                                               struct dst_entry *dst)
515 {
516         struct inet6_request_sock *ireq6 = inet6_rsk(req);
517         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
518         struct inet_sock *newinet;
519         struct dccp_sock *newdp;
520         struct dccp6_sock *newdp6;
521         struct sock *newsk;
522         struct ipv6_txoptions *opt;
523
524         if (skb->protocol == htons(ETH_P_IP)) {
525                 /*
526                  *      v6 mapped
527                  */
528                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
529                 if (newsk == NULL)
530                         return NULL;
531
532                 newdp6 = (struct dccp6_sock *)newsk;
533                 newdp = dccp_sk(newsk);
534                 newinet = inet_sk(newsk);
535                 newinet->pinet6 = &newdp6->inet6;
536                 newnp = inet6_sk(newsk);
537
538                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
539
540                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
541                               newinet->daddr);
542
543                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
544                               newinet->saddr);
545
546                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
547
548                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
549                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
550                 newnp->pktoptions  = NULL;
551                 newnp->opt         = NULL;
552                 newnp->mcast_oif   = inet6_iif(skb);
553                 newnp->mcast_hops  = skb->nh.ipv6h->hop_limit;
554
555                 /*
556                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
557                  * here, dccp_create_openreq_child now does this for us, see the comment in
558                  * that function for the gory details. -acme
559                  */
560
561                 /* It is tricky place. Until this moment IPv4 tcp
562                    worked with IPv6 icsk.icsk_af_ops.
563                    Sync it now.
564                  */
565                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
566
567                 return newsk;
568         }
569
570         opt = np->opt;
571
572         if (sk_acceptq_is_full(sk))
573                 goto out_overflow;
574
575         if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) {
576                 const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
577
578                 if (rxopt->srcrt)
579                         opt = ipv6_invert_rthdr(sk,
580                                 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
581                                                        rxopt->srcrt));
582         }
583
584         if (dst == NULL) {
585                 struct in6_addr *final_p = NULL, final;
586                 struct flowi fl;
587
588                 memset(&fl, 0, sizeof(fl));
589                 fl.proto = IPPROTO_DCCP;
590                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
591                 if (opt != NULL && opt->srcrt != NULL) {
592                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
593
594                         ipv6_addr_copy(&final, &fl.fl6_dst);
595                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
596                         final_p = &final;
597                 }
598                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
599                 fl.oif = sk->sk_bound_dev_if;
600                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
601                 fl.fl_ip_sport = inet_sk(sk)->sport;
602                 security_sk_classify_flow(sk, &fl);
603
604                 if (ip6_dst_lookup(sk, &dst, &fl))
605                         goto out;
606
607                 if (final_p)
608                         ipv6_addr_copy(&fl.fl6_dst, final_p);
609
610                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
611                         goto out;
612         }
613
614         newsk = dccp_create_openreq_child(sk, req, skb);
615         if (newsk == NULL)
616                 goto out;
617
618         /*
619          * No need to charge this sock to the relevant IPv6 refcnt debug socks
620          * count here, dccp_create_openreq_child now does this for us, see the
621          * comment in that function for the gory details. -acme
622          */
623
624         __ip6_dst_store(newsk, dst, NULL, NULL);
625         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
626                                                       NETIF_F_TSO);
627         newdp6 = (struct dccp6_sock *)newsk;
628         newinet = inet_sk(newsk);
629         newinet->pinet6 = &newdp6->inet6;
630         newdp = dccp_sk(newsk);
631         newnp = inet6_sk(newsk);
632
633         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
634
635         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
636         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
637         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
638         newsk->sk_bound_dev_if = ireq6->iif;
639
640         /* Now IPv6 options...
641
642            First: no IPv4 options.
643          */
644         newinet->opt = NULL;
645
646         /* Clone RX bits */
647         newnp->rxopt.all = np->rxopt.all;
648
649         /* Clone pktoptions received with SYN */
650         newnp->pktoptions = NULL;
651         if (ireq6->pktopts != NULL) {
652                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
653                 kfree_skb(ireq6->pktopts);
654                 ireq6->pktopts = NULL;
655                 if (newnp->pktoptions)
656                         skb_set_owner_r(newnp->pktoptions, newsk);
657         }
658         newnp->opt        = NULL;
659         newnp->mcast_oif  = inet6_iif(skb);
660         newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
661
662         /*
663          * Clone native IPv6 options from listening socket (if any)
664          *
665          * Yes, keeping reference count would be much more clever, but we make
666          * one more one thing there: reattach optmem to newsk.
667          */
668         if (opt != NULL) {
669                 newnp->opt = ipv6_dup_options(newsk, opt);
670                 if (opt != np->opt)
671                         sock_kfree_s(sk, opt, opt->tot_len);
672         }
673
674         inet_csk(newsk)->icsk_ext_hdr_len = 0;
675         if (newnp->opt != NULL)
676                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
677                                                      newnp->opt->opt_flen);
678
679         dccp_sync_mss(newsk, dst_mtu(dst));
680
681         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
682
683         __inet6_hash(&dccp_hashinfo, newsk);
684         inet_inherit_port(&dccp_hashinfo, sk, newsk);
685
686         return newsk;
687
688 out_overflow:
689         NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
690 out:
691         NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
692         if (opt != NULL && opt != np->opt)
693                 sock_kfree_s(sk, opt, opt->tot_len);
694         dst_release(dst);
695         return NULL;
696 }
697
698 /* The socket must have it's spinlock held when we get
699  * here.
700  *
701  * We have a potential double-lock case here, so even when
702  * doing backlog processing we use the BH locking scheme.
703  * This is because we cannot sleep with the original spinlock
704  * held.
705  */
706 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
707 {
708         struct ipv6_pinfo *np = inet6_sk(sk);
709         struct sk_buff *opt_skb = NULL;
710
711         /* Imagine: socket is IPv6. IPv4 packet arrives,
712            goes to IPv4 receive handler and backlogged.
713            From backlog it always goes here. Kerboom...
714            Fortunately, dccp_rcv_established and rcv_established
715            handle them correctly, but it is not case with
716            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
717          */
718
719         if (skb->protocol == htons(ETH_P_IP))
720                 return dccp_v4_do_rcv(sk, skb);
721
722         if (sk_filter(sk, skb))
723                 goto discard;
724
725         /*
726          * socket locking is here for SMP purposes as backlog rcv is currently
727          * called with bh processing disabled.
728          */
729
730         /* Do Stevens' IPV6_PKTOPTIONS.
731
732            Yes, guys, it is the only place in our code, where we
733            may make it not affecting IPv4.
734            The rest of code is protocol independent,
735            and I do not like idea to uglify IPv4.
736
737            Actually, all the idea behind IPV6_PKTOPTIONS
738            looks not very well thought. For now we latch
739            options, received in the last packet, enqueued
740            by tcp. Feel free to propose better solution.
741                                                --ANK (980728)
742          */
743         if (np->rxopt.all)
744         /*
745          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
746          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
747          */
748                 opt_skb = skb_clone(skb, GFP_ATOMIC);
749
750         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
751                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
752                         goto reset;
753                 if (opt_skb) {
754                         /* XXX This is where we would goto ipv6_pktoptions. */
755                         __kfree_skb(opt_skb);
756                 }
757                 return 0;
758         }
759
760         /*
761          *  Step 3: Process LISTEN state
762          *     If S.state == LISTEN,
763          *       If P.type == Request or P contains a valid Init Cookie option,
764          *            (* Must scan the packet's options to check for Init
765          *               Cookies.  Only Init Cookies are processed here,
766          *               however; other options are processed in Step 8.  This
767          *               scan need only be performed if the endpoint uses Init
768          *               Cookies *)
769          *            (* Generate a new socket and switch to that socket *)
770          *            Set S := new socket for this port pair
771          *            S.state = RESPOND
772          *            Choose S.ISS (initial seqno) or set from Init Cookies
773          *            Initialize S.GAR := S.ISS
774          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
775          *            Continue with S.state == RESPOND
776          *            (* A Response packet will be generated in Step 11 *)
777          *       Otherwise,
778          *            Generate Reset(No Connection) unless P.type == Reset
779          *            Drop packet and return
780          *
781          * NOTE: the check for the packet types is done in
782          *       dccp_rcv_state_process
783          */
784         if (sk->sk_state == DCCP_LISTEN) {
785                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
786
787                 if (nsk == NULL)
788                         goto discard;
789                 /*
790                  * Queue it on the new socket if the new socket is active,
791                  * otherwise we just shortcircuit this and continue with
792                  * the new socket..
793                  */
794                 if (nsk != sk) {
795                         if (dccp_child_process(sk, nsk, skb))
796                                 goto reset;
797                         if (opt_skb != NULL)
798                                 __kfree_skb(opt_skb);
799                         return 0;
800                 }
801         }
802
803         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
804                 goto reset;
805         if (opt_skb) {
806                 /* XXX This is where we would goto ipv6_pktoptions. */
807                 __kfree_skb(opt_skb);
808         }
809         return 0;
810
811 reset:
812         dccp_v6_ctl_send_reset(skb);
813 discard:
814         if (opt_skb != NULL)
815                 __kfree_skb(opt_skb);
816         kfree_skb(skb);
817         return 0;
818 }
819
820 static int dccp_v6_rcv(struct sk_buff **pskb)
821 {
822         const struct dccp_hdr *dh;
823         struct sk_buff *skb = *pskb;
824         struct sock *sk;
825         int min_cov;
826
827         /* Step 1: Check header basics */
828
829         if (dccp_invalid_packet(skb))
830                 goto discard_it;
831
832         /* Step 1: If header checksum is incorrect, drop packet and return. */
833         if (dccp_v6_csum_finish(skb, &skb->nh.ipv6h->saddr,
834                                      &skb->nh.ipv6h->daddr)) {
835                 LIMIT_NETDEBUG(KERN_WARNING
836                                "%s: dropped packet with invalid checksum\n",
837                                __FUNCTION__);
838                 goto discard_it;
839         }
840
841         dh = dccp_hdr(skb);
842
843         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(skb);
844         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
845
846         if (dccp_packet_without_ack(skb))
847                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
848         else
849                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
850
851         /* Step 2:
852          *      Look up flow ID in table and get corresponding socket */
853         sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
854                             dh->dccph_sport,
855                             &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
856                             inet6_iif(skb));
857         /*
858          * Step 2:
859          *      If no socket ...
860          */
861         if (sk == NULL) {
862                 dccp_pr_debug("failed to look up flow ID in table and "
863                               "get corresponding socket\n");
864                 goto no_dccp_socket;
865         }
866
867         /*
868          * Step 2:
869          *      ... or S.state == TIMEWAIT,
870          *              Generate Reset(No Connection) unless P.type == Reset
871          *              Drop packet and return
872          */
873         if (sk->sk_state == DCCP_TIME_WAIT) {
874                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
875                 inet_twsk_put(inet_twsk(sk));
876                 goto no_dccp_socket;
877         }
878
879         /*
880          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
881          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
882          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
883          */
884         min_cov = dccp_sk(sk)->dccps_pcrlen;
885         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
886                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
887                               dh->dccph_cscov, min_cov);
888                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
889                 goto discard_and_relse;
890         }
891
892         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
893                 goto discard_and_relse;
894
895         return sk_receive_skb(sk, skb) ? -1 : 0;
896
897 no_dccp_socket:
898         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
899                 goto discard_it;
900         /*
901          * Step 2:
902          *      If no socket ...
903          *              Generate Reset(No Connection) unless P.type == Reset
904          *              Drop packet and return
905          */
906         if (dh->dccph_type != DCCP_PKT_RESET) {
907                 DCCP_SKB_CB(skb)->dccpd_reset_code =
908                                         DCCP_RESET_CODE_NO_CONNECTION;
909                 dccp_v6_ctl_send_reset(skb);
910         }
911
912 discard_it:
913         kfree_skb(skb);
914         return 0;
915
916 discard_and_relse:
917         sock_put(sk);
918         goto discard_it;
919 }
920
921 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
922                            int addr_len)
923 {
924         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
925         struct inet_connection_sock *icsk = inet_csk(sk);
926         struct inet_sock *inet = inet_sk(sk);
927         struct ipv6_pinfo *np = inet6_sk(sk);
928         struct dccp_sock *dp = dccp_sk(sk);
929         struct in6_addr *saddr = NULL, *final_p = NULL, final;
930         struct flowi fl;
931         struct dst_entry *dst;
932         int addr_type;
933         int err;
934
935         dp->dccps_role = DCCP_ROLE_CLIENT;
936
937         if (addr_len < SIN6_LEN_RFC2133)
938                 return -EINVAL;
939
940         if (usin->sin6_family != AF_INET6)
941                 return -EAFNOSUPPORT;
942
943         memset(&fl, 0, sizeof(fl));
944
945         if (np->sndflow) {
946                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
947                 IP6_ECN_flow_init(fl.fl6_flowlabel);
948                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
949                         struct ip6_flowlabel *flowlabel;
950                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
951                         if (flowlabel == NULL)
952                                 return -EINVAL;
953                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
954                         fl6_sock_release(flowlabel);
955                 }
956         }
957         /*
958          * connect() to INADDR_ANY means loopback (BSD'ism).
959          */
960         if (ipv6_addr_any(&usin->sin6_addr))
961                 usin->sin6_addr.s6_addr[15] = 1;
962
963         addr_type = ipv6_addr_type(&usin->sin6_addr);
964
965         if (addr_type & IPV6_ADDR_MULTICAST)
966                 return -ENETUNREACH;
967
968         if (addr_type & IPV6_ADDR_LINKLOCAL) {
969                 if (addr_len >= sizeof(struct sockaddr_in6) &&
970                     usin->sin6_scope_id) {
971                         /* If interface is set while binding, indices
972                          * must coincide.
973                          */
974                         if (sk->sk_bound_dev_if &&
975                             sk->sk_bound_dev_if != usin->sin6_scope_id)
976                                 return -EINVAL;
977
978                         sk->sk_bound_dev_if = usin->sin6_scope_id;
979                 }
980
981                 /* Connect to link-local address requires an interface */
982                 if (!sk->sk_bound_dev_if)
983                         return -EINVAL;
984         }
985
986         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
987         np->flow_label = fl.fl6_flowlabel;
988
989         /*
990          * DCCP over IPv4
991          */
992         if (addr_type == IPV6_ADDR_MAPPED) {
993                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
994                 struct sockaddr_in sin;
995
996                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
997
998                 if (__ipv6_only_sock(sk))
999                         return -ENETUNREACH;
1000
1001                 sin.sin_family = AF_INET;
1002                 sin.sin_port = usin->sin6_port;
1003                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
1004
1005                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
1006                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
1007
1008                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
1009                 if (err) {
1010                         icsk->icsk_ext_hdr_len = exthdrlen;
1011                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
1012                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
1013                         goto failure;
1014                 } else {
1015                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
1016                                       inet->saddr);
1017                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
1018                                       inet->rcv_saddr);
1019                 }
1020
1021                 return err;
1022         }
1023
1024         if (!ipv6_addr_any(&np->rcv_saddr))
1025                 saddr = &np->rcv_saddr;
1026
1027         fl.proto = IPPROTO_DCCP;
1028         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
1029         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
1030         fl.oif = sk->sk_bound_dev_if;
1031         fl.fl_ip_dport = usin->sin6_port;
1032         fl.fl_ip_sport = inet->sport;
1033         security_sk_classify_flow(sk, &fl);
1034
1035         if (np->opt != NULL && np->opt->srcrt != NULL) {
1036                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
1037
1038                 ipv6_addr_copy(&final, &fl.fl6_dst);
1039                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1040                 final_p = &final;
1041         }
1042
1043         err = ip6_dst_lookup(sk, &dst, &fl);
1044         if (err)
1045                 goto failure;
1046
1047         if (final_p)
1048                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1049
1050         err = xfrm_lookup(&dst, &fl, sk, 0);
1051         if (err < 0)
1052                 goto failure;
1053
1054         if (saddr == NULL) {
1055                 saddr = &fl.fl6_src;
1056                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1057         }
1058
1059         /* set the source address */
1060         ipv6_addr_copy(&np->saddr, saddr);
1061         inet->rcv_saddr = LOOPBACK4_IPV6;
1062
1063         __ip6_dst_store(sk, dst, NULL, NULL);
1064
1065         icsk->icsk_ext_hdr_len = 0;
1066         if (np->opt != NULL)
1067                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1068                                           np->opt->opt_nflen);
1069
1070         inet->dport = usin->sin6_port;
1071
1072         dccp_set_state(sk, DCCP_REQUESTING);
1073         err = inet6_hash_connect(&dccp_death_row, sk);
1074         if (err)
1075                 goto late_failure;
1076         /* FIXME */
1077 #if 0
1078         dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32,
1079                                                        np->daddr.s6_addr32,
1080                                                        inet->sport,
1081                                                        inet->dport);
1082 #endif
1083         err = dccp_connect(sk);
1084         if (err)
1085                 goto late_failure;
1086
1087         return 0;
1088
1089 late_failure:
1090         dccp_set_state(sk, DCCP_CLOSED);
1091         __sk_dst_reset(sk);
1092 failure:
1093         inet->dport = 0;
1094         sk->sk_route_caps = 0;
1095         return err;
1096 }
1097
1098 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1099         .queue_xmit        = inet6_csk_xmit,
1100         .send_check        = dccp_v6_send_check,
1101         .rebuild_header    = inet6_sk_rebuild_header,
1102         .conn_request      = dccp_v6_conn_request,
1103         .syn_recv_sock     = dccp_v6_request_recv_sock,
1104         .net_header_len    = sizeof(struct ipv6hdr),
1105         .setsockopt        = ipv6_setsockopt,
1106         .getsockopt        = ipv6_getsockopt,
1107         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1108         .sockaddr_len      = sizeof(struct sockaddr_in6),
1109 #ifdef CONFIG_COMPAT
1110         .compat_setsockopt = compat_ipv6_setsockopt,
1111         .compat_getsockopt = compat_ipv6_getsockopt,
1112 #endif
1113 };
1114
1115 /*
1116  *      DCCP over IPv4 via INET6 API
1117  */
1118 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1119         .queue_xmit        = ip_queue_xmit,
1120         .send_check        = dccp_v4_send_check,
1121         .rebuild_header    = inet_sk_rebuild_header,
1122         .conn_request      = dccp_v6_conn_request,
1123         .syn_recv_sock     = dccp_v6_request_recv_sock,
1124         .net_header_len    = sizeof(struct iphdr),
1125         .setsockopt        = ipv6_setsockopt,
1126         .getsockopt        = ipv6_getsockopt,
1127         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1128         .sockaddr_len      = sizeof(struct sockaddr_in6),
1129 #ifdef CONFIG_COMPAT
1130         .compat_setsockopt = compat_ipv6_setsockopt,
1131         .compat_getsockopt = compat_ipv6_getsockopt,
1132 #endif
1133 };
1134
1135 /* NOTE: A lot of things set to zero explicitly by call to
1136  *       sk_alloc() so need not be done here.
1137  */
1138 static int dccp_v6_init_sock(struct sock *sk)
1139 {
1140         static __u8 dccp_v6_ctl_sock_initialized;
1141         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1142
1143         if (err == 0) {
1144                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1145                         dccp_v6_ctl_sock_initialized = 1;
1146                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1147         }
1148
1149         return err;
1150 }
1151
1152 static int dccp_v6_destroy_sock(struct sock *sk)
1153 {
1154         dccp_destroy_sock(sk);
1155         return inet6_destroy_sock(sk);
1156 }
1157
1158 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1159         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1160 };
1161
1162 static struct proto dccp_v6_prot = {
1163         .name              = "DCCPv6",
1164         .owner             = THIS_MODULE,
1165         .close             = dccp_close,
1166         .connect           = dccp_v6_connect,
1167         .disconnect        = dccp_disconnect,
1168         .ioctl             = dccp_ioctl,
1169         .init              = dccp_v6_init_sock,
1170         .setsockopt        = dccp_setsockopt,
1171         .getsockopt        = dccp_getsockopt,
1172         .sendmsg           = dccp_sendmsg,
1173         .recvmsg           = dccp_recvmsg,
1174         .backlog_rcv       = dccp_v6_do_rcv,
1175         .hash              = dccp_v6_hash,
1176         .unhash            = dccp_unhash,
1177         .accept            = inet_csk_accept,
1178         .get_port          = dccp_v6_get_port,
1179         .shutdown          = dccp_shutdown,
1180         .destroy           = dccp_v6_destroy_sock,
1181         .orphan_count      = &dccp_orphan_count,
1182         .max_header        = MAX_DCCP_HEADER,
1183         .obj_size          = sizeof(struct dccp6_sock),
1184         .rsk_prot          = &dccp6_request_sock_ops,
1185         .twsk_prot         = &dccp6_timewait_sock_ops,
1186 #ifdef CONFIG_COMPAT
1187         .compat_setsockopt = compat_dccp_setsockopt,
1188         .compat_getsockopt = compat_dccp_getsockopt,
1189 #endif
1190 };
1191
1192 static struct inet6_protocol dccp_v6_protocol = {
1193         .handler        = dccp_v6_rcv,
1194         .err_handler    = dccp_v6_err,
1195         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1196 };
1197
1198 static struct proto_ops inet6_dccp_ops = {
1199         .family            = PF_INET6,
1200         .owner             = THIS_MODULE,
1201         .release           = inet6_release,
1202         .bind              = inet6_bind,
1203         .connect           = inet_stream_connect,
1204         .socketpair        = sock_no_socketpair,
1205         .accept            = inet_accept,
1206         .getname           = inet6_getname,
1207         .poll              = dccp_poll,
1208         .ioctl             = inet6_ioctl,
1209         .listen            = inet_dccp_listen,
1210         .shutdown          = inet_shutdown,
1211         .setsockopt        = sock_common_setsockopt,
1212         .getsockopt        = sock_common_getsockopt,
1213         .sendmsg           = inet_sendmsg,
1214         .recvmsg           = sock_common_recvmsg,
1215         .mmap              = sock_no_mmap,
1216         .sendpage          = sock_no_sendpage,
1217 #ifdef CONFIG_COMPAT
1218         .compat_setsockopt = compat_sock_common_setsockopt,
1219         .compat_getsockopt = compat_sock_common_getsockopt,
1220 #endif
1221 };
1222
1223 static struct inet_protosw dccp_v6_protosw = {
1224         .type           = SOCK_DCCP,
1225         .protocol       = IPPROTO_DCCP,
1226         .prot           = &dccp_v6_prot,
1227         .ops            = &inet6_dccp_ops,
1228         .capability     = -1,
1229         .flags          = INET_PROTOSW_ICSK,
1230 };
1231
1232 static int __init dccp_v6_init(void)
1233 {
1234         int err = proto_register(&dccp_v6_prot, 1);
1235
1236         if (err != 0)
1237                 goto out;
1238
1239         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1240         if (err != 0)
1241                 goto out_unregister_proto;
1242
1243         inet6_register_protosw(&dccp_v6_protosw);
1244
1245         err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1246                                        SOCK_DCCP, IPPROTO_DCCP);
1247         if (err != 0)
1248                 goto out_unregister_protosw;
1249 out:
1250         return err;
1251 out_unregister_protosw:
1252         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1253         inet6_unregister_protosw(&dccp_v6_protosw);
1254 out_unregister_proto:
1255         proto_unregister(&dccp_v6_prot);
1256         goto out;
1257 }
1258
1259 static void __exit dccp_v6_exit(void)
1260 {
1261         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1262         inet6_unregister_protosw(&dccp_v6_protosw);
1263         proto_unregister(&dccp_v6_prot);
1264 }
1265
1266 module_init(dccp_v6_init);
1267 module_exit(dccp_v6_exit);
1268
1269 /*
1270  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1271  * values directly, Also cover the case where the protocol is not specified,
1272  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1273  */
1274 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1275 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1276 MODULE_LICENSE("GPL");
1277 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1278 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");