net/dccp/ipv6.c

   1 /*
   2  *      DCCP over IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Based on net/dccp6/ipv6.c
   6  *
   7  *      Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/random.h>
  17 #include <linux/xfrm.h>
  18
  19 #include <net/addrconf.h>
  20 #include <net/inet_common.h>
  21 #include <net/inet_hashtables.h>
  22 #include <net/inet_sock.h>
  23 #include <net/inet6_connection_sock.h>
  24 #include <net/inet6_hashtables.h>
  25 #include <net/ip6_route.h>
  26 #include <net/ipv6.h>
  27 #include <net/protocol.h>
  28 #include <net/transp_v6.h>
  29 #include <net/ip6_checksum.h>
  30 #include <net/xfrm.h>
  31
  32 #include "dccp.h"
  33 #include "ipv6.h"
  34 #include "feat.h"
  35
  36 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
  37
  38 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  39 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  40
  41 static void dccp_v6_hash(struct sock *sk)
  42 {
  43         if (sk->sk_state != DCCP_CLOSED) {
  44                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
  45                         inet_hash(sk);
  46                         return;
  47                 }
  48                 local_bh_disable();
  49                 __inet6_hash(sk);
  50                 local_bh_enable();
  51         }
  52 }
  53
  54 /* add pseudo-header to DCCP checksum stored in skb->csum */
  55 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
  56                                       struct in6_addr *saddr,
  57                                       struct in6_addr *daddr)
  58 {
  59         return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
  60 }
  61
  62 static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
  63                                       struct sk_buff *skb)
  64 {
  65         struct ipv6_pinfo *np = inet6_sk(sk);
  66         struct dccp_hdr *dh = dccp_hdr(skb);
  67
  68         dccp_csum_outgoing(skb);
  69         dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
  70 }
  71
  72 static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
  73                                                   __be16 sport, __be16 dport   )
  74 {
  75         return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
  76 }
  77
  78 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
  79 {
  80         return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
  81                                              ipv6_hdr(skb)->saddr.s6_addr32,
  82                                              dccp_hdr(skb)->dccph_dport,
  83                                              dccp_hdr(skb)->dccph_sport     );
  84
  85 }
  86
  87 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
  88                         int type, int code, int offset, __be32 info)
  89 {
  90         struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
  91         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
  92         struct dccp_sock *dp;
  93         struct ipv6_pinfo *np;
  94         struct sock *sk;
  95         int err;
  96         __u64 seq;
  97         struct net *net = dev_net(skb->dev);
  98
  99         sk = inet6_lookup(net, &dccp_hashinfo,
 100                         &hdr->daddr, dh->dccph_dport,
 101                         &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 102
 103         if (sk == NULL) {
 104                 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
 105                 return;
 106         }
 107
 108         if (sk->sk_state == DCCP_TIME_WAIT) {
 109                 inet_twsk_put(inet_twsk(sk));
 110                 return;
 111         }
 112
 113         bh_lock_sock(sk);
 114         if (sock_owned_by_user(sk))
 115                 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
 116
 117         if (sk->sk_state == DCCP_CLOSED)
 118                 goto out;
 119
 120         dp = dccp_sk(sk);
 121         seq = dccp_hdr_seq(dh);
 122         if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
 123             !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
 124                 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 125                 goto out;
 126         }
 127
 128         np = inet6_sk(sk);
 129
 130         if (type == ICMPV6_PKT_TOOBIG) {
 131                 struct dst_entry *dst = NULL;
 132
 133                 if (sock_owned_by_user(sk))
 134                         goto out;
 135                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 136                         goto out;
 137
 138                 /* icmp should have updated the destination cache entry */
 139                 dst = __sk_dst_check(sk, np->dst_cookie);
 140                 if (dst == NULL) {
 141                         struct inet_sock *inet = inet_sk(sk);
 142                         struct flowi fl;
 143
 144                         /* BUGGG_FUTURE: Again, it is not clear how
 145                            to handle rthdr case. Ignore this complexity
 146                            for now.
 147                          */
 148                         memset(&fl, 0, sizeof(fl));
 149                         fl.proto = IPPROTO_DCCP;
 150                         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 151                         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 152                         fl.oif = sk->sk_bound_dev_if;
 153                         fl.fl_ip_dport = inet->dport;
 154                         fl.fl_ip_sport = inet->sport;
 155                         security_sk_classify_flow(sk, &fl);
 156
 157                         err = ip6_dst_lookup(sk, &dst, &fl);
 158                         if (err) {
 159                                 sk->sk_err_soft = -err;
 160                                 goto out;
 161                         }
 162
 163                         err = xfrm_lookup(&dst, &fl, sk, 0);
 164                         if (err < 0) {
 165                                 sk->sk_err_soft = -err;
 166                                 goto out;
 167                         }
 168                 } else
 169                         dst_hold(dst);
 170
 171                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 172                         dccp_sync_mss(sk, dst_mtu(dst));
 173                 } /* else let the usual retransmit timer handle it */
 174                 dst_release(dst);
 175                 goto out;
 176         }
 177
 178         icmpv6_err_convert(type, code, &err);
 179
 180         /* Might be for an request_sock */
 181         switch (sk->sk_state) {
 182                 struct request_sock *req, **prev;
 183         case DCCP_LISTEN:
 184                 if (sock_owned_by_user(sk))
 185                         goto out;
 186
 187                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 188                                            &hdr->daddr, &hdr->saddr,
 189                                            inet6_iif(skb));
 190                 if (req == NULL)
 191                         goto out;
 192
 193                 /*
 194                  * ICMPs are not backlogged, hence we cannot get an established
 195                  * socket here.
 196                  */
 197                 WARN_ON(req->sk != NULL);
 198
 199                 if (seq != dccp_rsk(req)->dreq_iss) {
 200                         NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 201                         goto out;
 202                 }
 203
 204                 inet_csk_reqsk_queue_drop(sk, req, prev);
 205                 goto out;
 206
 207         case DCCP_REQUESTING:
 208         case DCCP_RESPOND:  /* Cannot happen.
 209                                It can, it SYNs are crossed. --ANK */
 210                 if (!sock_owned_by_user(sk)) {
 211                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 212                         sk->sk_err = err;
 213                         /*
 214                          * Wake people up to see the error
 215                          * (see connect in sock.c)
 216                          */
 217                         sk->sk_error_report(sk);
 218                         dccp_done(sk);
 219                 } else
 220                         sk->sk_err_soft = err;
 221                 goto out;
 222         }
 223
 224         if (!sock_owned_by_user(sk) && np->recverr) {
 225                 sk->sk_err = err;
 226                 sk->sk_error_report(sk);
 227         } else
 228                 sk->sk_err_soft = err;
 229
 230 out:
 231         bh_unlock_sock(sk);
 232         sock_put(sk);
 233 }
 234
 235
 236 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
 237 {
 238         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 239         struct ipv6_pinfo *np = inet6_sk(sk);
 240         struct sk_buff *skb;
 241         struct ipv6_txoptions *opt = NULL;
 242         struct in6_addr *final_p = NULL, final;
 243         struct flowi fl;
 244         int err = -1;
 245         struct dst_entry *dst;
 246
 247         memset(&fl, 0, sizeof(fl));
 248         fl.proto = IPPROTO_DCCP;
 249         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 250         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 251         fl.fl6_flowlabel = 0;
 252         fl.oif = ireq6->iif;
 253         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 254         fl.fl_ip_sport = inet_sk(sk)->sport;
 255         security_req_classify_flow(req, &fl);
 256
 257         opt = np->opt;
 258
 259         if (opt != NULL && opt->srcrt != NULL) {
 260                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 261
 262                 ipv6_addr_copy(&final, &fl.fl6_dst);
 263                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 264                 final_p = &final;
 265         }
 266
 267         err = ip6_dst_lookup(sk, &dst, &fl);
 268         if (err)
 269                 goto done;
 270
 271         if (final_p)
 272                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 273
 274         err = xfrm_lookup(&dst, &fl, sk, 0);
 275         if (err < 0)
 276                 goto done;
 277
 278         skb = dccp_make_response(sk, dst, req);
 279         if (skb != NULL) {
 280                 struct dccp_hdr *dh = dccp_hdr(skb);
 281
 282                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
 283                                                          &ireq6->loc_addr,
 284                                                          &ireq6->rmt_addr);
 285                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 286                 err = ip6_xmit(sk, skb, &fl, opt, 0);
 287                 err = net_xmit_eval(err);
 288         }
 289
 290 done:
 291         if (opt != NULL && opt != np->opt)
 292                 sock_kfree_s(sk, opt, opt->tot_len);
 293         dst_release(dst);
 294         return err;
 295 }
 296
 297 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 298 {
 299         if (inet6_rsk(req)->pktopts != NULL)
 300                 kfree_skb(inet6_rsk(req)->pktopts);
 301 }
 302
 303 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 304 {
 305         struct ipv6hdr *rxip6h;
 306         struct sk_buff *skb;
 307         struct flowi fl;
 308         struct net *net = dev_net(rxskb->dst->dev);
 309         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 310
 311         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 312                 return;
 313
 314         if (!ipv6_unicast_destination(rxskb))
 315                 return;
 316
 317         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 318         if (skb == NULL)
 319                 return;
 320
 321         rxip6h = ipv6_hdr(rxskb);
 322         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 323                                                             &rxip6h->daddr);
 324
 325         memset(&fl, 0, sizeof(fl));
 326         ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
 327         ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
 328
 329         fl.proto = IPPROTO_DCCP;
 330         fl.oif = inet6_iif(rxskb);
 331         fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
 332         fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
 333         security_skb_classify_flow(rxskb, &fl);
 334
 335         /* sk = NULL, but it is safe for now. RST socket required. */
 336         if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) {
 337                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 338                         ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
 339                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 340                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 341                         return;
 342                 }
 343         }
 344
 345         kfree_skb(skb);
 346 }
 347
 348 static struct request_sock_ops dccp6_request_sock_ops = {
 349         .family         = AF_INET6,
 350         .obj_size       = sizeof(struct dccp6_request_sock),
 351         .rtx_syn_ack    = dccp_v6_send_response,
 352         .send_ack       = dccp_reqsk_send_ack,
 353         .destructor     = dccp_v6_reqsk_destructor,
 354         .send_reset     = dccp_v6_ctl_send_reset,
 355 };
 356
 357 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 358 {
 359         const struct dccp_hdr *dh = dccp_hdr(skb);
 360         const struct ipv6hdr *iph = ipv6_hdr(skb);
 361         struct sock *nsk;
 362         struct request_sock **prev;
 363         /* Find possible connection requests. */
 364         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 365                                                         dh->dccph_sport,
 366                                                         &iph->saddr,
 367                                                         &iph->daddr,
 368                                                         inet6_iif(skb));
 369         if (req != NULL)
 370                 return dccp_check_req(sk, skb, req, prev);
 371
 372         nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
 373                                          &iph->saddr, dh->dccph_sport,
 374                                          &iph->daddr, ntohs(dh->dccph_dport),
 375                                          inet6_iif(skb));
 376         if (nsk != NULL) {
 377                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 378                         bh_lock_sock(nsk);
 379                         return nsk;
 380                 }
 381                 inet_twsk_put(inet_twsk(nsk));
 382                 return NULL;
 383         }
 384
 385         return sk;
 386 }
 387
 388 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 389 {
 390         struct request_sock *req;
 391         struct dccp_request_sock *dreq;
 392         struct inet6_request_sock *ireq6;
 393         struct ipv6_pinfo *np = inet6_sk(sk);
 394         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 395         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 396
 397         if (skb->protocol == htons(ETH_P_IP))
 398                 return dccp_v4_conn_request(sk, skb);
 399
 400         if (!ipv6_unicast_destination(skb))
 401                 return 0;       /* discard, don't send a reset here */
 402
 403         if (dccp_bad_service_code(sk, service)) {
 404                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 405                 goto drop;
 406         }
 407         /*
 408          * There are no SYN attacks on IPv6, yet...
 409          */
 410         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 411         if (inet_csk_reqsk_queue_is_full(sk))
 412                 goto drop;
 413
 414         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 415                 goto drop;
 416
 417         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 418         if (req == NULL)
 419                 goto drop;
 420
 421         dccp_reqsk_init(req, skb);
 422
 423         dreq = dccp_rsk(req);
 424         if (dccp_parse_options(sk, dreq, skb))
 425                 goto drop_and_free;
 426
 427         if (security_inet_conn_request(sk, skb, req))
 428                 goto drop_and_free;
 429
 430         ireq6 = inet6_rsk(req);
 431         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
 432         ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
 433
 434         if (ipv6_opt_accepted(sk, skb) ||
 435             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 436             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 437                 atomic_inc(&skb->users);
 438                 ireq6->pktopts = skb;
 439         }
 440         ireq6->iif = sk->sk_bound_dev_if;
 441
 442         /* So that link locals have meaning */
 443         if (!sk->sk_bound_dev_if &&
 444             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 445                 ireq6->iif = inet6_iif(skb);
 446
 447         /*
 448          * Step 3: Process LISTEN state
 449          *
 450          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 451          *
 452          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 453          *   dccp_create_openreq_child.
 454          */
 455         dreq->dreq_isr     = dcb->dccpd_seq;
 456         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 457         dreq->dreq_service = service;
 458
 459         if (dccp_v6_send_response(sk, req))
 460                 goto drop_and_free;
 461
 462         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 463         return 0;
 464
 465 drop_and_free:
 466         reqsk_free(req);
 467 drop:
 468         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 469         return -1;
 470 }
 471
 472 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 473                                               struct sk_buff *skb,
 474                                               struct request_sock *req,
 475                                               struct dst_entry *dst)
 476 {
 477         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 478         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 479         struct inet_sock *newinet;
 480         struct dccp_sock *newdp;
 481         struct dccp6_sock *newdp6;
 482         struct sock *newsk;
 483         struct ipv6_txoptions *opt;
 484
 485         if (skb->protocol == htons(ETH_P_IP)) {
 486                 /*
 487                  *      v6 mapped
 488                  */
 489                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 490                 if (newsk == NULL)
 491                         return NULL;
 492
 493                 newdp6 = (struct dccp6_sock *)newsk;
 494                 newdp = dccp_sk(newsk);
 495                 newinet = inet_sk(newsk);
 496                 newinet->pinet6 = &newdp6->inet6;
 497                 newnp = inet6_sk(newsk);
 498
 499                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 500
 501                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 502                               newinet->daddr);
 503
 504                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 505                               newinet->saddr);
 506
 507                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 508
 509                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 510                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 511                 newnp->pktoptions  = NULL;
 512                 newnp->opt         = NULL;
 513                 newnp->mcast_oif   = inet6_iif(skb);
 514                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 515
 516                 /*
 517                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 518                  * here, dccp_create_openreq_child now does this for us, see the comment in
 519                  * that function for the gory details. -acme
 520                  */
 521
 522                 /* It is tricky place. Until this moment IPv4 tcp
 523                    worked with IPv6 icsk.icsk_af_ops.
 524                    Sync it now.
 525                  */
 526                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 527
 528                 return newsk;
 529         }
 530
 531         opt = np->opt;
 532
 533         if (sk_acceptq_is_full(sk))
 534                 goto out_overflow;
 535
 536         if (dst == NULL) {
 537                 struct in6_addr *final_p = NULL, final;
 538                 struct flowi fl;
 539
 540                 memset(&fl, 0, sizeof(fl));
 541                 fl.proto = IPPROTO_DCCP;
 542                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 543                 if (opt != NULL && opt->srcrt != NULL) {
 544                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 545
 546                         ipv6_addr_copy(&final, &fl.fl6_dst);
 547                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 548                         final_p = &final;
 549                 }
 550                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 551                 fl.oif = sk->sk_bound_dev_if;
 552                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 553                 fl.fl_ip_sport = inet_sk(sk)->sport;
 554                 security_sk_classify_flow(sk, &fl);
 555
 556                 if (ip6_dst_lookup(sk, &dst, &fl))
 557                         goto out;
 558
 559                 if (final_p)
 560                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 561
 562                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 563                         goto out;
 564         }
 565
 566         newsk = dccp_create_openreq_child(sk, req, skb);
 567         if (newsk == NULL)
 568                 goto out;
 569
 570         /*
 571          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 572          * count here, dccp_create_openreq_child now does this for us, see the
 573          * comment in that function for the gory details. -acme
 574          */
 575
 576         __ip6_dst_store(newsk, dst, NULL, NULL);
 577         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 578                                                       NETIF_F_TSO);
 579         newdp6 = (struct dccp6_sock *)newsk;
 580         newinet = inet_sk(newsk);
 581         newinet->pinet6 = &newdp6->inet6;
 582         newdp = dccp_sk(newsk);
 583         newnp = inet6_sk(newsk);
 584
 585         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 586
 587         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 588         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 589         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 590         newsk->sk_bound_dev_if = ireq6->iif;
 591
 592         /* Now IPv6 options...
 593
 594            First: no IPv4 options.
 595          */
 596         newinet->opt = NULL;
 597
 598         /* Clone RX bits */
 599         newnp->rxopt.all = np->rxopt.all;
 600
 601         /* Clone pktoptions received with SYN */
 602         newnp->pktoptions = NULL;
 603         if (ireq6->pktopts != NULL) {
 604                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 605                 kfree_skb(ireq6->pktopts);
 606                 ireq6->pktopts = NULL;
 607                 if (newnp->pktoptions)
 608                         skb_set_owner_r(newnp->pktoptions, newsk);
 609         }
 610         newnp->opt        = NULL;
 611         newnp->mcast_oif  = inet6_iif(skb);
 612         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 613
 614         /*
 615          * Clone native IPv6 options from listening socket (if any)
 616          *
 617          * Yes, keeping reference count would be much more clever, but we make
 618          * one more one thing there: reattach optmem to newsk.
 619          */
 620         if (opt != NULL) {
 621                 newnp->opt = ipv6_dup_options(newsk, opt);
 622                 if (opt != np->opt)
 623                         sock_kfree_s(sk, opt, opt->tot_len);
 624         }
 625
 626         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 627         if (newnp->opt != NULL)
 628                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 629                                                      newnp->opt->opt_flen);
 630
 631         dccp_sync_mss(newsk, dst_mtu(dst));
 632
 633         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 634
 635         __inet6_hash(newsk);
 636         __inet_inherit_port(sk, newsk);
 637
 638         return newsk;
 639
 640 out_overflow:
 641         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 642 out:
 643         NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
 644         if (opt != NULL && opt != np->opt)
 645                 sock_kfree_s(sk, opt, opt->tot_len);
 646         dst_release(dst);
 647         return NULL;
 648 }
 649
 650 /* The socket must have it's spinlock held when we get
 651  * here.
 652  *
 653  * We have a potential double-lock case here, so even when
 654  * doing backlog processing we use the BH locking scheme.
 655  * This is because we cannot sleep with the original spinlock
 656  * held.
 657  */
 658 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 659 {
 660         struct ipv6_pinfo *np = inet6_sk(sk);
 661         struct sk_buff *opt_skb = NULL;
 662
 663         /* Imagine: socket is IPv6. IPv4 packet arrives,
 664            goes to IPv4 receive handler and backlogged.
 665            From backlog it always goes here. Kerboom...
 666            Fortunately, dccp_rcv_established and rcv_established
 667            handle them correctly, but it is not case with
 668            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 669          */
 670
 671         if (skb->protocol == htons(ETH_P_IP))
 672                 return dccp_v4_do_rcv(sk, skb);
 673
 674         if (sk_filter(sk, skb))
 675                 goto discard;
 676
 677         /*
 678          * socket locking is here for SMP purposes as backlog rcv is currently
 679          * called with bh processing disabled.
 680          */
 681
 682         /* Do Stevens' IPV6_PKTOPTIONS.
 683
 684            Yes, guys, it is the only place in our code, where we
 685            may make it not affecting IPv4.
 686            The rest of code is protocol independent,
 687            and I do not like idea to uglify IPv4.
 688
 689            Actually, all the idea behind IPV6_PKTOPTIONS
 690            looks not very well thought. For now we latch
 691            options, received in the last packet, enqueued
 692            by tcp. Feel free to propose better solution.
 693                                                --ANK (980728)
 694          */
 695         if (np->rxopt.all)
 696         /*
 697          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 698          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 699          */
 700                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 701
 702         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 703                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 704                         goto reset;
 705                 if (opt_skb) {
 706                         /* XXX This is where we would goto ipv6_pktoptions. */
 707                         __kfree_skb(opt_skb);
 708                 }
 709                 return 0;
 710         }
 711
 712         /*
 713          *  Step 3: Process LISTEN state
 714          *     If S.state == LISTEN,
 715          *       If P.type == Request or P contains a valid Init Cookie option,
 716          *            (* Must scan the packet's options to check for Init
 717          *               Cookies.  Only Init Cookies are processed here,
 718          *               however; other options are processed in Step 8.  This
 719          *               scan need only be performed if the endpoint uses Init
 720          *               Cookies *)
 721          *            (* Generate a new socket and switch to that socket *)
 722          *            Set S := new socket for this port pair
 723          *            S.state = RESPOND
 724          *            Choose S.ISS (initial seqno) or set from Init Cookies
 725          *            Initialize S.GAR := S.ISS
 726          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 727          *            Continue with S.state == RESPOND
 728          *            (* A Response packet will be generated in Step 11 *)
 729          *       Otherwise,
 730          *            Generate Reset(No Connection) unless P.type == Reset
 731          *            Drop packet and return
 732          *
 733          * NOTE: the check for the packet types is done in
 734          *       dccp_rcv_state_process
 735          */
 736         if (sk->sk_state == DCCP_LISTEN) {
 737                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 738
 739                 if (nsk == NULL)
 740                         goto discard;
 741                 /*
 742                  * Queue it on the new socket if the new socket is active,
 743                  * otherwise we just shortcircuit this and continue with
 744                  * the new socket..
 745                  */
 746                 if (nsk != sk) {
 747                         if (dccp_child_process(sk, nsk, skb))
 748                                 goto reset;
 749                         if (opt_skb != NULL)
 750                                 __kfree_skb(opt_skb);
 751                         return 0;
 752                 }
 753         }
 754
 755         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 756                 goto reset;
 757         if (opt_skb) {
 758                 /* XXX This is where we would goto ipv6_pktoptions. */
 759                 __kfree_skb(opt_skb);
 760         }
 761         return 0;
 762
 763 reset:
 764         dccp_v6_ctl_send_reset(sk, skb);
 765 discard:
 766         if (opt_skb != NULL)
 767                 __kfree_skb(opt_skb);
 768         kfree_skb(skb);
 769         return 0;
 770 }
 771
 772 static int dccp_v6_rcv(struct sk_buff *skb)
 773 {
 774         const struct dccp_hdr *dh;
 775         struct sock *sk;
 776         int min_cov;
 777
 778         /* Step 1: Check header basics */
 779
 780         if (dccp_invalid_packet(skb))
 781                 goto discard_it;
 782
 783         /* Step 1: If header checksum is incorrect, drop packet and return. */
 784         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 785                                      &ipv6_hdr(skb)->daddr)) {
 786                 DCCP_WARN("dropped packet with invalid checksum\n");
 787                 goto discard_it;
 788         }
 789
 790         dh = dccp_hdr(skb);
 791
 792         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 793         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 794
 795         if (dccp_packet_without_ack(skb))
 796                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 797         else
 798                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 799
 800         /* Step 2:
 801          *      Look up flow ID in table and get corresponding socket */
 802         sk = __inet6_lookup(dev_net(skb->dst->dev), &dccp_hashinfo,
 803                             &ipv6_hdr(skb)->saddr, dh->dccph_sport,
 804                             &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
 805                             inet6_iif(skb));
 806         /*
 807          * Step 2:
 808          *      If no socket ...
 809          */
 810         if (sk == NULL) {
 811                 dccp_pr_debug("failed to look up flow ID in table and "
 812                               "get corresponding socket\n");
 813                 goto no_dccp_socket;
 814         }
 815
 816         /*
 817          * Step 2:
 818          *      ... or S.state == TIMEWAIT,
 819          *              Generate Reset(No Connection) unless P.type == Reset
 820          *              Drop packet and return
 821          */
 822         if (sk->sk_state == DCCP_TIME_WAIT) {
 823                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 824                 inet_twsk_put(inet_twsk(sk));
 825                 goto no_dccp_socket;
 826         }
 827
 828         /*
 829          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 830          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 831          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 832          */
 833         min_cov = dccp_sk(sk)->dccps_pcrlen;
 834         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 835                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 836                               dh->dccph_cscov, min_cov);
 837                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 838                 goto discard_and_relse;
 839         }
 840
 841         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 842                 goto discard_and_relse;
 843
 844         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 845
 846 no_dccp_socket:
 847         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 848                 goto discard_it;
 849         /*
 850          * Step 2:
 851          *      If no socket ...
 852          *              Generate Reset(No Connection) unless P.type == Reset
 853          *              Drop packet and return
 854          */
 855         if (dh->dccph_type != DCCP_PKT_RESET) {
 856                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 857                                         DCCP_RESET_CODE_NO_CONNECTION;
 858                 dccp_v6_ctl_send_reset(sk, skb);
 859         }
 860
 861 discard_it:
 862         kfree_skb(skb);
 863         return 0;
 864
 865 discard_and_relse:
 866         sock_put(sk);
 867         goto discard_it;
 868 }
 869
 870 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 871                            int addr_len)
 872 {
 873         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 874         struct inet_connection_sock *icsk = inet_csk(sk);
 875         struct inet_sock *inet = inet_sk(sk);
 876         struct ipv6_pinfo *np = inet6_sk(sk);
 877         struct dccp_sock *dp = dccp_sk(sk);
 878         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 879         struct flowi fl;
 880         struct dst_entry *dst;
 881         int addr_type;
 882         int err;
 883
 884         dp->dccps_role = DCCP_ROLE_CLIENT;
 885
 886         if (addr_len < SIN6_LEN_RFC2133)
 887                 return -EINVAL;
 888
 889         if (usin->sin6_family != AF_INET6)
 890                 return -EAFNOSUPPORT;
 891
 892         memset(&fl, 0, sizeof(fl));
 893
 894         if (np->sndflow) {
 895                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 896                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 897                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 898                         struct ip6_flowlabel *flowlabel;
 899                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 900                         if (flowlabel == NULL)
 901                                 return -EINVAL;
 902                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 903                         fl6_sock_release(flowlabel);
 904                 }
 905         }
 906         /*
 907          * connect() to INADDR_ANY means loopback (BSD'ism).
 908          */
 909         if (ipv6_addr_any(&usin->sin6_addr))
 910                 usin->sin6_addr.s6_addr[15] = 1;
 911
 912         addr_type = ipv6_addr_type(&usin->sin6_addr);
 913
 914         if (addr_type & IPV6_ADDR_MULTICAST)
 915                 return -ENETUNREACH;
 916
 917         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 918                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 919                     usin->sin6_scope_id) {
 920                         /* If interface is set while binding, indices
 921                          * must coincide.
 922                          */
 923                         if (sk->sk_bound_dev_if &&
 924                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 925                                 return -EINVAL;
 926
 927                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 928                 }
 929
 930                 /* Connect to link-local address requires an interface */
 931                 if (!sk->sk_bound_dev_if)
 932                         return -EINVAL;
 933         }
 934
 935         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 936         np->flow_label = fl.fl6_flowlabel;
 937
 938         /*
 939          * DCCP over IPv4
 940          */
 941         if (addr_type == IPV6_ADDR_MAPPED) {
 942                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 943                 struct sockaddr_in sin;
 944
 945                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 946
 947                 if (__ipv6_only_sock(sk))
 948                         return -ENETUNREACH;
 949
 950                 sin.sin_family = AF_INET;
 951                 sin.sin_port = usin->sin6_port;
 952                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 953
 954                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 955                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 956
 957                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 958                 if (err) {
 959                         icsk->icsk_ext_hdr_len = exthdrlen;
 960                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 961                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 962                         goto failure;
 963                 } else {
 964                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
 965                                       inet->saddr);
 966                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
 967                                       inet->rcv_saddr);
 968                 }
 969
 970                 return err;
 971         }
 972
 973         if (!ipv6_addr_any(&np->rcv_saddr))
 974                 saddr = &np->rcv_saddr;
 975
 976         fl.proto = IPPROTO_DCCP;
 977         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 978         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 979         fl.oif = sk->sk_bound_dev_if;
 980         fl.fl_ip_dport = usin->sin6_port;
 981         fl.fl_ip_sport = inet->sport;
 982         security_sk_classify_flow(sk, &fl);
 983
 984         if (np->opt != NULL && np->opt->srcrt != NULL) {
 985                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 986
 987                 ipv6_addr_copy(&final, &fl.fl6_dst);
 988                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 989                 final_p = &final;
 990         }
 991
 992         err = ip6_dst_lookup(sk, &dst, &fl);
 993         if (err)
 994                 goto failure;
 995
 996         if (final_p)
 997                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 998
 999         err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT);
1000         if (err < 0) {
1001                 if (err == -EREMOTE)
1002                         err = ip6_dst_blackhole(sk, &dst, &fl);
1003                 if (err < 0)
1004                         goto failure;
1005         }
1006
1007         if (saddr == NULL) {
1008                 saddr = &fl.fl6_src;
1009                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1010         }
1011
1012         /* set the source address */
1013         ipv6_addr_copy(&np->saddr, saddr);
1014         inet->rcv_saddr = LOOPBACK4_IPV6;
1015
1016         __ip6_dst_store(sk, dst, NULL, NULL);
1017
1018         icsk->icsk_ext_hdr_len = 0;
1019         if (np->opt != NULL)
1020                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1021                                           np->opt->opt_nflen);
1022
1023         inet->dport = usin->sin6_port;
1024
1025         dccp_set_state(sk, DCCP_REQUESTING);
1026         err = inet6_hash_connect(&dccp_death_row, sk);
1027         if (err)
1028                 goto late_failure;
1029
1030         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1031                                                       np->daddr.s6_addr32,
1032                                                       inet->sport, inet->dport);
1033         err = dccp_connect(sk);
1034         if (err)
1035                 goto late_failure;
1036
1037         return 0;
1038
1039 late_failure:
1040         dccp_set_state(sk, DCCP_CLOSED);
1041         __sk_dst_reset(sk);
1042 failure:
1043         inet->dport = 0;
1044         sk->sk_route_caps = 0;
1045         return err;
1046 }
1047
1048 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1049         .queue_xmit        = inet6_csk_xmit,
1050         .send_check        = dccp_v6_send_check,
1051         .rebuild_header    = inet6_sk_rebuild_header,
1052         .conn_request      = dccp_v6_conn_request,
1053         .syn_recv_sock     = dccp_v6_request_recv_sock,
1054         .net_header_len    = sizeof(struct ipv6hdr),
1055         .setsockopt        = ipv6_setsockopt,
1056         .getsockopt        = ipv6_getsockopt,
1057         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1058         .sockaddr_len      = sizeof(struct sockaddr_in6),
1059         .bind_conflict     = inet6_csk_bind_conflict,
1060 #ifdef CONFIG_COMPAT
1061         .compat_setsockopt = compat_ipv6_setsockopt,
1062         .compat_getsockopt = compat_ipv6_getsockopt,
1063 #endif
1064 };
1065
1066 /*
1067  *      DCCP over IPv4 via INET6 API
1068  */
1069 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1070         .queue_xmit        = ip_queue_xmit,
1071         .send_check        = dccp_v4_send_check,
1072         .rebuild_header    = inet_sk_rebuild_header,
1073         .conn_request      = dccp_v6_conn_request,
1074         .syn_recv_sock     = dccp_v6_request_recv_sock,
1075         .net_header_len    = sizeof(struct iphdr),
1076         .setsockopt        = ipv6_setsockopt,
1077         .getsockopt        = ipv6_getsockopt,
1078         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1079         .sockaddr_len      = sizeof(struct sockaddr_in6),
1080 #ifdef CONFIG_COMPAT
1081         .compat_setsockopt = compat_ipv6_setsockopt,
1082         .compat_getsockopt = compat_ipv6_getsockopt,
1083 #endif
1084 };
1085
1086 /* NOTE: A lot of things set to zero explicitly by call to
1087  *       sk_alloc() so need not be done here.
1088  */
1089 static int dccp_v6_init_sock(struct sock *sk)
1090 {
1091         static __u8 dccp_v6_ctl_sock_initialized;
1092         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1093
1094         if (err == 0) {
1095                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1096                         dccp_v6_ctl_sock_initialized = 1;
1097                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1098         }
1099
1100         return err;
1101 }
1102
1103 static void dccp_v6_destroy_sock(struct sock *sk)
1104 {
1105         dccp_destroy_sock(sk);
1106         inet6_destroy_sock(sk);
1107 }
1108
1109 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1110         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1111 };
1112
1113 static struct proto dccp_v6_prot = {
1114         .name              = "DCCPv6",
1115         .owner             = THIS_MODULE,
1116         .close             = dccp_close,
1117         .connect           = dccp_v6_connect,
1118         .disconnect        = dccp_disconnect,
1119         .ioctl             = dccp_ioctl,
1120         .init              = dccp_v6_init_sock,
1121         .setsockopt        = dccp_setsockopt,
1122         .getsockopt        = dccp_getsockopt,
1123         .sendmsg           = dccp_sendmsg,
1124         .recvmsg           = dccp_recvmsg,
1125         .backlog_rcv       = dccp_v6_do_rcv,
1126         .hash              = dccp_v6_hash,
1127         .unhash            = inet_unhash,
1128         .accept            = inet_csk_accept,
1129         .get_port          = inet_csk_get_port,
1130         .shutdown          = dccp_shutdown,
1131         .destroy           = dccp_v6_destroy_sock,
1132         .orphan_count      = &dccp_orphan_count,
1133         .max_header        = MAX_DCCP_HEADER,
1134         .obj_size          = sizeof(struct dccp6_sock),
1135         .rsk_prot          = &dccp6_request_sock_ops,
1136         .twsk_prot         = &dccp6_timewait_sock_ops,
1137         .h.hashinfo        = &dccp_hashinfo,
1138 #ifdef CONFIG_COMPAT
1139         .compat_setsockopt = compat_dccp_setsockopt,
1140         .compat_getsockopt = compat_dccp_getsockopt,
1141 #endif
1142 };
1143
1144 static struct inet6_protocol dccp_v6_protocol = {
1145         .handler        = dccp_v6_rcv,
1146         .err_handler    = dccp_v6_err,
1147         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1148 };
1149
1150 static struct proto_ops inet6_dccp_ops = {
1151         .family            = PF_INET6,
1152         .owner             = THIS_MODULE,
1153         .release           = inet6_release,
1154         .bind              = inet6_bind,
1155         .connect           = inet_stream_connect,
1156         .socketpair        = sock_no_socketpair,
1157         .accept            = inet_accept,
1158         .getname           = inet6_getname,
1159         .poll              = dccp_poll,
1160         .ioctl             = inet6_ioctl,
1161         .listen            = inet_dccp_listen,
1162         .shutdown          = inet_shutdown,
1163         .setsockopt        = sock_common_setsockopt,
1164         .getsockopt        = sock_common_getsockopt,
1165         .sendmsg           = inet_sendmsg,
1166         .recvmsg           = sock_common_recvmsg,
1167         .mmap              = sock_no_mmap,
1168         .sendpage          = sock_no_sendpage,
1169 #ifdef CONFIG_COMPAT
1170         .compat_setsockopt = compat_sock_common_setsockopt,
1171         .compat_getsockopt = compat_sock_common_getsockopt,
1172 #endif
1173 };
1174
1175 static struct inet_protosw dccp_v6_protosw = {
1176         .type           = SOCK_DCCP,
1177         .protocol       = IPPROTO_DCCP,
1178         .prot           = &dccp_v6_prot,
1179         .ops            = &inet6_dccp_ops,
1180         .capability     = -1,
1181         .flags          = INET_PROTOSW_ICSK,
1182 };
1183
1184 static int dccp_v6_init_net(struct net *net)
1185 {
1186         int err;
1187
1188         err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1189                                    SOCK_DCCP, IPPROTO_DCCP, net);
1190         return err;
1191 }
1192
1193 static void dccp_v6_exit_net(struct net *net)
1194 {
1195         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1196 }
1197
1198 static struct pernet_operations dccp_v6_ops = {
1199         .init   = dccp_v6_init_net,
1200         .exit   = dccp_v6_exit_net,
1201 };
1202
1203 static int __init dccp_v6_init(void)
1204 {
1205         int err = proto_register(&dccp_v6_prot, 1);
1206
1207         if (err != 0)
1208                 goto out;
1209
1210         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1211         if (err != 0)
1212                 goto out_unregister_proto;
1213
1214         inet6_register_protosw(&dccp_v6_protosw);
1215
1216         err = register_pernet_subsys(&dccp_v6_ops);
1217         if (err != 0)
1218                 goto out_destroy_ctl_sock;
1219 out:
1220         return err;
1221
1222 out_destroy_ctl_sock:
1223         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1224         inet6_unregister_protosw(&dccp_v6_protosw);
1225 out_unregister_proto:
1226         proto_unregister(&dccp_v6_prot);
1227         goto out;
1228 }
1229
1230 static void __exit dccp_v6_exit(void)
1231 {
1232         unregister_pernet_subsys(&dccp_v6_ops);
1233         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1234         inet6_unregister_protosw(&dccp_v6_protosw);
1235         proto_unregister(&dccp_v6_prot);
1236 }
1237
1238 module_init(dccp_v6_init);
1239 module_exit(dccp_v6_exit);
1240
1241 /*
1242  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1243  * values directly, Also cover the case where the protocol is not specified,
1244  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1245  */
1246 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1247 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1248 MODULE_LICENSE("GPL");
1249 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1250 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");