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_hdr_seq(dh);
 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 ipv6hdr *rxip6h;
 305         struct sk_buff *skb;
 306         struct flowi fl;
 307
 308         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 309                 return;
 310
 311         if (!ipv6_unicast_destination(rxskb))
 312                 return;
 313
 314         skb = dccp_ctl_make_reset(dccp_v6_ctl_socket, rxskb);
 315         if (skb == NULL)
 316                 return;
 317
 318         rxip6h = ipv6_hdr(rxskb);
 319         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 320                                                             &rxip6h->daddr);
 321
 322         memset(&fl, 0, sizeof(fl));
 323         ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
 324         ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
 325
 326         fl.proto = IPPROTO_DCCP;
 327         fl.oif = inet6_iif(rxskb);
 328         fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
 329         fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
 330         security_skb_classify_flow(rxskb, &fl);
 331
 332         /* sk = NULL, but it is safe for now. RST socket required. */
 333         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
 334                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 335                         ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
 336                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 337                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 338                         return;
 339                 }
 340         }
 341
 342         kfree_skb(skb);
 343 }
 344
 345 static struct request_sock_ops dccp6_request_sock_ops = {
 346         .family         = AF_INET6,
 347         .obj_size       = sizeof(struct dccp6_request_sock),
 348         .rtx_syn_ack    = dccp_v6_send_response,
 349         .send_ack       = dccp_reqsk_send_ack,
 350         .destructor     = dccp_v6_reqsk_destructor,
 351         .send_reset     = dccp_v6_ctl_send_reset,
 352 };
 353
 354 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 355 {
 356         const struct dccp_hdr *dh = dccp_hdr(skb);
 357         const struct ipv6hdr *iph = ipv6_hdr(skb);
 358         struct sock *nsk;
 359         struct request_sock **prev;
 360         /* Find possible connection requests. */
 361         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 362                                                         dh->dccph_sport,
 363                                                         &iph->saddr,
 364                                                         &iph->daddr,
 365                                                         inet6_iif(skb));
 366         if (req != NULL)
 367                 return dccp_check_req(sk, skb, req, prev);
 368
 369         nsk = __inet6_lookup_established(&dccp_hashinfo,
 370                                          &iph->saddr, dh->dccph_sport,
 371                                          &iph->daddr, ntohs(dh->dccph_dport),
 372                                          inet6_iif(skb));
 373         if (nsk != NULL) {
 374                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 375                         bh_lock_sock(nsk);
 376                         return nsk;
 377                 }
 378                 inet_twsk_put(inet_twsk(nsk));
 379                 return NULL;
 380         }
 381
 382         return sk;
 383 }
 384
 385 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 386 {
 387         struct request_sock *req;
 388         struct dccp_request_sock *dreq;
 389         struct inet6_request_sock *ireq6;
 390         struct ipv6_pinfo *np = inet6_sk(sk);
 391         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 392         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 393
 394         if (skb->protocol == htons(ETH_P_IP))
 395                 return dccp_v4_conn_request(sk, skb);
 396
 397         if (!ipv6_unicast_destination(skb))
 398                 return 0;       /* discard, don't send a reset here */
 399
 400         if (dccp_bad_service_code(sk, service)) {
 401                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 402                 goto drop;
 403         }
 404         /*
 405          * There are no SYN attacks on IPv6, yet...
 406          */
 407         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 408         if (inet_csk_reqsk_queue_is_full(sk))
 409                 goto drop;
 410
 411         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 412                 goto drop;
 413
 414         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 415         if (req == NULL)
 416                 goto drop;
 417
 418         if (dccp_parse_options(sk, skb))
 419                 goto drop_and_free;
 420
 421         dccp_reqsk_init(req, skb);
 422
 423         if (security_inet_conn_request(sk, skb, req))
 424                 goto drop_and_free;
 425
 426         ireq6 = inet6_rsk(req);
 427         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
 428         ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
 429         ireq6->pktopts  = NULL;
 430
 431         if (ipv6_opt_accepted(sk, skb) ||
 432             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 433             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 434                 atomic_inc(&skb->users);
 435                 ireq6->pktopts = skb;
 436         }
 437         ireq6->iif = sk->sk_bound_dev_if;
 438
 439         /* So that link locals have meaning */
 440         if (!sk->sk_bound_dev_if &&
 441             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 442                 ireq6->iif = inet6_iif(skb);
 443
 444         /*
 445          * Step 3: Process LISTEN state
 446          *
 447          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 448          *
 449          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 450          *   dccp_create_openreq_child.
 451          */
 452         dreq = dccp_rsk(req);
 453         dreq->dreq_isr     = dcb->dccpd_seq;
 454         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 455         dreq->dreq_service = service;
 456
 457         if (dccp_v6_send_response(sk, req, NULL))
 458                 goto drop_and_free;
 459
 460         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 461         return 0;
 462
 463 drop_and_free:
 464         reqsk_free(req);
 465 drop:
 466         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 467         return -1;
 468 }
 469
 470 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 471                                               struct sk_buff *skb,
 472                                               struct request_sock *req,
 473                                               struct dst_entry *dst)
 474 {
 475         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 476         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 477         struct inet_sock *newinet;
 478         struct dccp_sock *newdp;
 479         struct dccp6_sock *newdp6;
 480         struct sock *newsk;
 481         struct ipv6_txoptions *opt;
 482
 483         if (skb->protocol == htons(ETH_P_IP)) {
 484                 /*
 485                  *      v6 mapped
 486                  */
 487                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 488                 if (newsk == NULL)
 489                         return NULL;
 490
 491                 newdp6 = (struct dccp6_sock *)newsk;
 492                 newdp = dccp_sk(newsk);
 493                 newinet = inet_sk(newsk);
 494                 newinet->pinet6 = &newdp6->inet6;
 495                 newnp = inet6_sk(newsk);
 496
 497                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 498
 499                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 500                               newinet->daddr);
 501
 502                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 503                               newinet->saddr);
 504
 505                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 506
 507                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 508                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 509                 newnp->pktoptions  = NULL;
 510                 newnp->opt         = NULL;
 511                 newnp->mcast_oif   = inet6_iif(skb);
 512                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 513
 514                 /*
 515                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 516                  * here, dccp_create_openreq_child now does this for us, see the comment in
 517                  * that function for the gory details. -acme
 518                  */
 519
 520                 /* It is tricky place. Until this moment IPv4 tcp
 521                    worked with IPv6 icsk.icsk_af_ops.
 522                    Sync it now.
 523                  */
 524                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 525
 526                 return newsk;
 527         }
 528
 529         opt = np->opt;
 530
 531         if (sk_acceptq_is_full(sk))
 532                 goto out_overflow;
 533
 534         if (dst == NULL) {
 535                 struct in6_addr *final_p = NULL, final;
 536                 struct flowi fl;
 537
 538                 memset(&fl, 0, sizeof(fl));
 539                 fl.proto = IPPROTO_DCCP;
 540                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 541                 if (opt != NULL && opt->srcrt != NULL) {
 542                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 543
 544                         ipv6_addr_copy(&final, &fl.fl6_dst);
 545                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 546                         final_p = &final;
 547                 }
 548                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 549                 fl.oif = sk->sk_bound_dev_if;
 550                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 551                 fl.fl_ip_sport = inet_sk(sk)->sport;
 552                 security_sk_classify_flow(sk, &fl);
 553
 554                 if (ip6_dst_lookup(sk, &dst, &fl))
 555                         goto out;
 556
 557                 if (final_p)
 558                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 559
 560                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 561                         goto out;
 562         }
 563
 564         newsk = dccp_create_openreq_child(sk, req, skb);
 565         if (newsk == NULL)
 566                 goto out;
 567
 568         /*
 569          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 570          * count here, dccp_create_openreq_child now does this for us, see the
 571          * comment in that function for the gory details. -acme
 572          */
 573
 574         __ip6_dst_store(newsk, dst, NULL, NULL);
 575         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 576                                                       NETIF_F_TSO);
 577         newdp6 = (struct dccp6_sock *)newsk;
 578         newinet = inet_sk(newsk);
 579         newinet->pinet6 = &newdp6->inet6;
 580         newdp = dccp_sk(newsk);
 581         newnp = inet6_sk(newsk);
 582
 583         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 584
 585         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 586         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 587         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 588         newsk->sk_bound_dev_if = ireq6->iif;
 589
 590         /* Now IPv6 options...
 591
 592            First: no IPv4 options.
 593          */
 594         newinet->opt = NULL;
 595
 596         /* Clone RX bits */
 597         newnp->rxopt.all = np->rxopt.all;
 598
 599         /* Clone pktoptions received with SYN */
 600         newnp->pktoptions = NULL;
 601         if (ireq6->pktopts != NULL) {
 602                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 603                 kfree_skb(ireq6->pktopts);
 604                 ireq6->pktopts = NULL;
 605                 if (newnp->pktoptions)
 606                         skb_set_owner_r(newnp->pktoptions, newsk);
 607         }
 608         newnp->opt        = NULL;
 609         newnp->mcast_oif  = inet6_iif(skb);
 610         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 611
 612         /*
 613          * Clone native IPv6 options from listening socket (if any)
 614          *
 615          * Yes, keeping reference count would be much more clever, but we make
 616          * one more one thing there: reattach optmem to newsk.
 617          */
 618         if (opt != NULL) {
 619                 newnp->opt = ipv6_dup_options(newsk, opt);
 620                 if (opt != np->opt)
 621                         sock_kfree_s(sk, opt, opt->tot_len);
 622         }
 623
 624         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 625         if (newnp->opt != NULL)
 626                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 627                                                      newnp->opt->opt_flen);
 628
 629         dccp_sync_mss(newsk, dst_mtu(dst));
 630
 631         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 632
 633         __inet6_hash(&dccp_hashinfo, newsk);
 634         inet_inherit_port(&dccp_hashinfo, sk, newsk);
 635
 636         return newsk;
 637
 638 out_overflow:
 639         NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
 640 out:
 641         NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
 642         if (opt != NULL && opt != np->opt)
 643                 sock_kfree_s(sk, opt, opt->tot_len);
 644         dst_release(dst);
 645         return NULL;
 646 }
 647
 648 /* The socket must have it's spinlock held when we get
 649  * here.
 650  *
 651  * We have a potential double-lock case here, so even when
 652  * doing backlog processing we use the BH locking scheme.
 653  * This is because we cannot sleep with the original spinlock
 654  * held.
 655  */
 656 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 657 {
 658         struct ipv6_pinfo *np = inet6_sk(sk);
 659         struct sk_buff *opt_skb = NULL;
 660
 661         /* Imagine: socket is IPv6. IPv4 packet arrives,
 662            goes to IPv4 receive handler and backlogged.
 663            From backlog it always goes here. Kerboom...
 664            Fortunately, dccp_rcv_established and rcv_established
 665            handle them correctly, but it is not case with
 666            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 667          */
 668
 669         if (skb->protocol == htons(ETH_P_IP))
 670                 return dccp_v4_do_rcv(sk, skb);
 671
 672         if (sk_filter(sk, skb))
 673                 goto discard;
 674
 675         /*
 676          * socket locking is here for SMP purposes as backlog rcv is currently
 677          * called with bh processing disabled.
 678          */
 679
 680         /* Do Stevens' IPV6_PKTOPTIONS.
 681
 682            Yes, guys, it is the only place in our code, where we
 683            may make it not affecting IPv4.
 684            The rest of code is protocol independent,
 685            and I do not like idea to uglify IPv4.
 686
 687            Actually, all the idea behind IPV6_PKTOPTIONS
 688            looks not very well thought. For now we latch
 689            options, received in the last packet, enqueued
 690            by tcp. Feel free to propose better solution.
 691                                                --ANK (980728)
 692          */
 693         if (np->rxopt.all)
 694         /*
 695          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 696          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 697          */
 698                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 699
 700         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 701                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 702                         goto reset;
 703                 if (opt_skb) {
 704                         /* XXX This is where we would goto ipv6_pktoptions. */
 705                         __kfree_skb(opt_skb);
 706                 }
 707                 return 0;
 708         }
 709
 710         /*
 711          *  Step 3: Process LISTEN state
 712          *     If S.state == LISTEN,
 713          *       If P.type == Request or P contains a valid Init Cookie option,
 714          *            (* Must scan the packet's options to check for Init
 715          *               Cookies.  Only Init Cookies are processed here,
 716          *               however; other options are processed in Step 8.  This
 717          *               scan need only be performed if the endpoint uses Init
 718          *               Cookies *)
 719          *            (* Generate a new socket and switch to that socket *)
 720          *            Set S := new socket for this port pair
 721          *            S.state = RESPOND
 722          *            Choose S.ISS (initial seqno) or set from Init Cookies
 723          *            Initialize S.GAR := S.ISS
 724          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 725          *            Continue with S.state == RESPOND
 726          *            (* A Response packet will be generated in Step 11 *)
 727          *       Otherwise,
 728          *            Generate Reset(No Connection) unless P.type == Reset
 729          *            Drop packet and return
 730          *
 731          * NOTE: the check for the packet types is done in
 732          *       dccp_rcv_state_process
 733          */
 734         if (sk->sk_state == DCCP_LISTEN) {
 735                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 736
 737                 if (nsk == NULL)
 738                         goto discard;
 739                 /*
 740                  * Queue it on the new socket if the new socket is active,
 741                  * otherwise we just shortcircuit this and continue with
 742                  * the new socket..
 743                  */
 744                 if (nsk != sk) {
 745                         if (dccp_child_process(sk, nsk, skb))
 746                                 goto reset;
 747                         if (opt_skb != NULL)
 748                                 __kfree_skb(opt_skb);
 749                         return 0;
 750                 }
 751         }
 752
 753         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 754                 goto reset;
 755         if (opt_skb) {
 756                 /* XXX This is where we would goto ipv6_pktoptions. */
 757                 __kfree_skb(opt_skb);
 758         }
 759         return 0;
 760
 761 reset:
 762         dccp_v6_ctl_send_reset(sk, skb);
 763 discard:
 764         if (opt_skb != NULL)
 765                 __kfree_skb(opt_skb);
 766         kfree_skb(skb);
 767         return 0;
 768 }
 769
 770 static int dccp_v6_rcv(struct sk_buff *skb)
 771 {
 772         const struct dccp_hdr *dh;
 773         struct sock *sk;
 774         int min_cov;
 775
 776         /* Step 1: Check header basics */
 777
 778         if (dccp_invalid_packet(skb))
 779                 goto discard_it;
 780
 781         /* Step 1: If header checksum is incorrect, drop packet and return. */
 782         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 783                                      &ipv6_hdr(skb)->daddr)) {
 784                 DCCP_WARN("dropped packet with invalid checksum\n");
 785                 goto discard_it;
 786         }
 787
 788         dh = dccp_hdr(skb);
 789
 790         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 791         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 792
 793         if (dccp_packet_without_ack(skb))
 794                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 795         else
 796                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 797
 798         /* Step 2:
 799          *      Look up flow ID in table and get corresponding socket */
 800         sk = __inet6_lookup(&dccp_hashinfo, &ipv6_hdr(skb)->saddr,
 801                             dh->dccph_sport,
 802                             &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
 803                             inet6_iif(skb));
 804         /*
 805          * Step 2:
 806          *      If no socket ...
 807          */
 808         if (sk == NULL) {
 809                 dccp_pr_debug("failed to look up flow ID in table and "
 810                               "get corresponding socket\n");
 811                 goto no_dccp_socket;
 812         }
 813
 814         /*
 815          * Step 2:
 816          *      ... or S.state == TIMEWAIT,
 817          *              Generate Reset(No Connection) unless P.type == Reset
 818          *              Drop packet and return
 819          */
 820         if (sk->sk_state == DCCP_TIME_WAIT) {
 821                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 822                 inet_twsk_put(inet_twsk(sk));
 823                 goto no_dccp_socket;
 824         }
 825
 826         /*
 827          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 828          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 829          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 830          */
 831         min_cov = dccp_sk(sk)->dccps_pcrlen;
 832         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 833                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 834                               dh->dccph_cscov, min_cov);
 835                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 836                 goto discard_and_relse;
 837         }
 838
 839         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 840                 goto discard_and_relse;
 841
 842         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 843
 844 no_dccp_socket:
 845         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 846                 goto discard_it;
 847         /*
 848          * Step 2:
 849          *      If no socket ...
 850          *              Generate Reset(No Connection) unless P.type == Reset
 851          *              Drop packet and return
 852          */
 853         if (dh->dccph_type != DCCP_PKT_RESET) {
 854                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 855                                         DCCP_RESET_CODE_NO_CONNECTION;
 856                 dccp_v6_ctl_send_reset(sk, skb);
 857         }
 858
 859 discard_it:
 860         kfree_skb(skb);
 861         return 0;
 862
 863 discard_and_relse:
 864         sock_put(sk);
 865         goto discard_it;
 866 }
 867
 868 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 869                            int addr_len)
 870 {
 871         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 872         struct inet_connection_sock *icsk = inet_csk(sk);
 873         struct inet_sock *inet = inet_sk(sk);
 874         struct ipv6_pinfo *np = inet6_sk(sk);
 875         struct dccp_sock *dp = dccp_sk(sk);
 876         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 877         struct flowi fl;
 878         struct dst_entry *dst;
 879         int addr_type;
 880         int err;
 881
 882         dp->dccps_role = DCCP_ROLE_CLIENT;
 883
 884         if (addr_len < SIN6_LEN_RFC2133)
 885                 return -EINVAL;
 886
 887         if (usin->sin6_family != AF_INET6)
 888                 return -EAFNOSUPPORT;
 889
 890         memset(&fl, 0, sizeof(fl));
 891
 892         if (np->sndflow) {
 893                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 894                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 895                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 896                         struct ip6_flowlabel *flowlabel;
 897                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 898                         if (flowlabel == NULL)
 899                                 return -EINVAL;
 900                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 901                         fl6_sock_release(flowlabel);
 902                 }
 903         }
 904         /*
 905          * connect() to INADDR_ANY means loopback (BSD'ism).
 906          */
 907         if (ipv6_addr_any(&usin->sin6_addr))
 908                 usin->sin6_addr.s6_addr[15] = 1;
 909
 910         addr_type = ipv6_addr_type(&usin->sin6_addr);
 911
 912         if (addr_type & IPV6_ADDR_MULTICAST)
 913                 return -ENETUNREACH;
 914
 915         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 916                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 917                     usin->sin6_scope_id) {
 918                         /* If interface is set while binding, indices
 919                          * must coincide.
 920                          */
 921                         if (sk->sk_bound_dev_if &&
 922                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 923                                 return -EINVAL;
 924
 925                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 926                 }
 927
 928                 /* Connect to link-local address requires an interface */
 929                 if (!sk->sk_bound_dev_if)
 930                         return -EINVAL;
 931         }
 932
 933         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 934         np->flow_label = fl.fl6_flowlabel;
 935
 936         /*
 937          * DCCP over IPv4
 938          */
 939         if (addr_type == IPV6_ADDR_MAPPED) {
 940                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 941                 struct sockaddr_in sin;
 942
 943                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 944
 945                 if (__ipv6_only_sock(sk))
 946                         return -ENETUNREACH;
 947
 948                 sin.sin_family = AF_INET;
 949                 sin.sin_port = usin->sin6_port;
 950                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 951
 952                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 953                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 954
 955                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 956                 if (err) {
 957                         icsk->icsk_ext_hdr_len = exthdrlen;
 958                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 959                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 960                         goto failure;
 961                 } else {
 962                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
 963                                       inet->saddr);
 964                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
 965                                       inet->rcv_saddr);
 966                 }
 967
 968                 return err;
 969         }
 970
 971         if (!ipv6_addr_any(&np->rcv_saddr))
 972                 saddr = &np->rcv_saddr;
 973
 974         fl.proto = IPPROTO_DCCP;
 975         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 976         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 977         fl.oif = sk->sk_bound_dev_if;
 978         fl.fl_ip_dport = usin->sin6_port;
 979         fl.fl_ip_sport = inet->sport;
 980         security_sk_classify_flow(sk, &fl);
 981
 982         if (np->opt != NULL && np->opt->srcrt != NULL) {
 983                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 984
 985                 ipv6_addr_copy(&final, &fl.fl6_dst);
 986                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 987                 final_p = &final;
 988         }
 989
 990         err = ip6_dst_lookup(sk, &dst, &fl);
 991         if (err)
 992                 goto failure;
 993
 994         if (final_p)
 995                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 996
 997         err = __xfrm_lookup(&dst, &fl, sk, 1);
 998         if (err < 0) {
 999                 if (err == -EREMOTE)
1000                         err = ip6_dst_blackhole(sk, &dst, &fl);
1001                 if (err < 0)
1002                         goto failure;
1003         }
1004
1005         if (saddr == NULL) {
1006                 saddr = &fl.fl6_src;
1007                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1008         }
1009
1010         /* set the source address */
1011         ipv6_addr_copy(&np->saddr, saddr);
1012         inet->rcv_saddr = LOOPBACK4_IPV6;
1013
1014         __ip6_dst_store(sk, dst, NULL, NULL);
1015
1016         icsk->icsk_ext_hdr_len = 0;
1017         if (np->opt != NULL)
1018                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1019                                           np->opt->opt_nflen);
1020
1021         inet->dport = usin->sin6_port;
1022
1023         dccp_set_state(sk, DCCP_REQUESTING);
1024         err = inet6_hash_connect(&dccp_death_row, sk);
1025         if (err)
1026                 goto late_failure;
1027
1028         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1029                                                       np->daddr.s6_addr32,
1030                                                       inet->sport, inet->dport);
1031         err = dccp_connect(sk);
1032         if (err)
1033                 goto late_failure;
1034
1035         return 0;
1036
1037 late_failure:
1038         dccp_set_state(sk, DCCP_CLOSED);
1039         __sk_dst_reset(sk);
1040 failure:
1041         inet->dport = 0;
1042         sk->sk_route_caps = 0;
1043         return err;
1044 }
1045
1046 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1047         .queue_xmit        = inet6_csk_xmit,
1048         .send_check        = dccp_v6_send_check,
1049         .rebuild_header    = inet6_sk_rebuild_header,
1050         .conn_request      = dccp_v6_conn_request,
1051         .syn_recv_sock     = dccp_v6_request_recv_sock,
1052         .net_header_len    = sizeof(struct ipv6hdr),
1053         .setsockopt        = ipv6_setsockopt,
1054         .getsockopt        = ipv6_getsockopt,
1055         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1056         .sockaddr_len      = sizeof(struct sockaddr_in6),
1057 #ifdef CONFIG_COMPAT
1058         .compat_setsockopt = compat_ipv6_setsockopt,
1059         .compat_getsockopt = compat_ipv6_getsockopt,
1060 #endif
1061 };
1062
1063 /*
1064  *      DCCP over IPv4 via INET6 API
1065  */
1066 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1067         .queue_xmit        = ip_queue_xmit,
1068         .send_check        = dccp_v4_send_check,
1069         .rebuild_header    = inet_sk_rebuild_header,
1070         .conn_request      = dccp_v6_conn_request,
1071         .syn_recv_sock     = dccp_v6_request_recv_sock,
1072         .net_header_len    = sizeof(struct iphdr),
1073         .setsockopt        = ipv6_setsockopt,
1074         .getsockopt        = ipv6_getsockopt,
1075         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1076         .sockaddr_len      = sizeof(struct sockaddr_in6),
1077 #ifdef CONFIG_COMPAT
1078         .compat_setsockopt = compat_ipv6_setsockopt,
1079         .compat_getsockopt = compat_ipv6_getsockopt,
1080 #endif
1081 };
1082
1083 /* NOTE: A lot of things set to zero explicitly by call to
1084  *       sk_alloc() so need not be done here.
1085  */
1086 static int dccp_v6_init_sock(struct sock *sk)
1087 {
1088         static __u8 dccp_v6_ctl_sock_initialized;
1089         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1090
1091         if (err == 0) {
1092                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1093                         dccp_v6_ctl_sock_initialized = 1;
1094                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1095         }
1096
1097         return err;
1098 }
1099
1100 static int dccp_v6_destroy_sock(struct sock *sk)
1101 {
1102         dccp_destroy_sock(sk);
1103         return inet6_destroy_sock(sk);
1104 }
1105
1106 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1107         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1108 };
1109
1110 DEFINE_PROTO_INUSE(dccp_v6)
1111
1112 static struct proto dccp_v6_prot = {
1113         .name              = "DCCPv6",
1114         .owner             = THIS_MODULE,
1115         .close             = dccp_close,
1116         .connect           = dccp_v6_connect,
1117         .disconnect        = dccp_disconnect,
1118         .ioctl             = dccp_ioctl,
1119         .init              = dccp_v6_init_sock,
1120         .setsockopt        = dccp_setsockopt,
1121         .getsockopt        = dccp_getsockopt,
1122         .sendmsg           = dccp_sendmsg,
1123         .recvmsg           = dccp_recvmsg,
1124         .backlog_rcv       = dccp_v6_do_rcv,
1125         .hash              = dccp_v6_hash,
1126         .unhash            = dccp_unhash,
1127         .accept            = inet_csk_accept,
1128         .get_port          = dccp_v6_get_port,
1129         .shutdown          = dccp_shutdown,
1130         .destroy           = dccp_v6_destroy_sock,
1131         .orphan_count      = &dccp_orphan_count,
1132         .max_header        = MAX_DCCP_HEADER,
1133         .obj_size          = sizeof(struct dccp6_sock),
1134         .rsk_prot          = &dccp6_request_sock_ops,
1135         .twsk_prot         = &dccp6_timewait_sock_ops,
1136 #ifdef CONFIG_COMPAT
1137         .compat_setsockopt = compat_dccp_setsockopt,
1138         .compat_getsockopt = compat_dccp_getsockopt,
1139 #endif
1140         REF_PROTO_INUSE(dccp_v6)
1141 };
1142
1143 static struct inet6_protocol dccp_v6_protocol = {
1144         .handler        = dccp_v6_rcv,
1145         .err_handler    = dccp_v6_err,
1146         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1147 };
1148
1149 static struct proto_ops inet6_dccp_ops = {
1150         .family            = PF_INET6,
1151         .owner             = THIS_MODULE,
1152         .release           = inet6_release,
1153         .bind              = inet6_bind,
1154         .connect           = inet_stream_connect,
1155         .socketpair        = sock_no_socketpair,
1156         .accept            = inet_accept,
1157         .getname           = inet6_getname,
1158         .poll              = dccp_poll,
1159         .ioctl             = inet6_ioctl,
1160         .listen            = inet_dccp_listen,
1161         .shutdown          = inet_shutdown,
1162         .setsockopt        = sock_common_setsockopt,
1163         .getsockopt        = sock_common_getsockopt,
1164         .sendmsg           = inet_sendmsg,
1165         .recvmsg           = sock_common_recvmsg,
1166         .mmap              = sock_no_mmap,
1167         .sendpage          = sock_no_sendpage,
1168 #ifdef CONFIG_COMPAT
1169         .compat_setsockopt = compat_sock_common_setsockopt,
1170         .compat_getsockopt = compat_sock_common_getsockopt,
1171 #endif
1172 };
1173
1174 static struct inet_protosw dccp_v6_protosw = {
1175         .type           = SOCK_DCCP,
1176         .protocol       = IPPROTO_DCCP,
1177         .prot           = &dccp_v6_prot,
1178         .ops            = &inet6_dccp_ops,
1179         .capability     = -1,
1180         .flags          = INET_PROTOSW_ICSK,
1181 };
1182
1183 static int __init dccp_v6_init(void)
1184 {
1185         int err = proto_register(&dccp_v6_prot, 1);
1186
1187         if (err != 0)
1188                 goto out;
1189
1190         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1191         if (err != 0)
1192                 goto out_unregister_proto;
1193
1194         inet6_register_protosw(&dccp_v6_protosw);
1195
1196         err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1197                                        SOCK_DCCP, IPPROTO_DCCP);
1198         if (err != 0)
1199                 goto out_unregister_protosw;
1200 out:
1201         return err;
1202 out_unregister_protosw:
1203         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1204         inet6_unregister_protosw(&dccp_v6_protosw);
1205 out_unregister_proto:
1206         proto_unregister(&dccp_v6_prot);
1207         goto out;
1208 }
1209
1210 static void __exit dccp_v6_exit(void)
1211 {
1212         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1213         inet6_unregister_protosw(&dccp_v6_protosw);
1214         proto_unregister(&dccp_v6_prot);
1215 }
1216
1217 module_init(dccp_v6_init);
1218 module_exit(dccp_v6_exit);
1219
1220 /*
1221  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1222  * values directly, Also cover the case where the protocol is not specified,
1223  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1224  */
1225 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1226 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1227 MODULE_LICENSE("GPL");
1228 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1229 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");