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/slab.h>
  18 #include <linux/xfrm.h>
  19 #include <linux/string.h>
  20
  21 #include <net/addrconf.h>
  22 #include <net/inet_common.h>
  23 #include <net/inet_hashtables.h>
  24 #include <net/inet_sock.h>
  25 #include <net/inet6_connection_sock.h>
  26 #include <net/inet6_hashtables.h>
  27 #include <net/ip6_route.h>
  28 #include <net/ipv6.h>
  29 #include <net/protocol.h>
  30 #include <net/transp_v6.h>
  31 #include <net/ip6_checksum.h>
  32 #include <net/xfrm.h>
  33 #include <net/secure_seq.h>
  34 #include <net/sock.h>
  35
  36 #include "dccp.h"
  37 #include "ipv6.h"
  38 #include "feat.h"
  39
  40 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
  41
  42 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  43 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  44
  45 /* add pseudo-header to DCCP checksum stored in skb->csum */
  46 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
  47                                       const struct in6_addr *saddr,
  48                                       const struct in6_addr *daddr)
  49 {
  50         return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
  51 }
  52
  53 static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
  54 {
  55         struct ipv6_pinfo *np = inet6_sk(sk);
  56         struct dccp_hdr *dh = dccp_hdr(skb);
  57
  58         dccp_csum_outgoing(skb);
  59         dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr);
  60 }
  61
  62 static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb)
  63 {
  64         return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
  65                                              ipv6_hdr(skb)->saddr.s6_addr32,
  66                                              dccp_hdr(skb)->dccph_dport,
  67                                              dccp_hdr(skb)->dccph_sport     );
  68
  69 }
  70
  71 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
  72                         u8 type, u8 code, int offset, __be32 info)
  73 {
  74         const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
  75         const struct dccp_hdr *dh;
  76         struct dccp_sock *dp;
  77         struct ipv6_pinfo *np;
  78         struct sock *sk;
  79         int err;
  80         __u64 seq;
  81         struct net *net = dev_net(skb->dev);
  82
  83         /* Only need dccph_dport & dccph_sport which are the first
  84          * 4 bytes in dccp header.
  85          * Our caller (icmpv6_notify()) already pulled 8 bytes for us.
  86          */
  87         BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8);
  88         BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8);
  89         dh = (struct dccp_hdr *)(skb->data + offset);
  90
  91         sk = __inet6_lookup_established(net, &dccp_hashinfo,
  92                                         &hdr->daddr, dh->dccph_dport,
  93                                         &hdr->saddr, ntohs(dh->dccph_sport),
  94                                         inet6_iif(skb), 0);
  95
  96         if (!sk) {
  97                 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
  98                                   ICMP6_MIB_INERRORS);
  99                 return;
 100         }
 101
 102         if (sk->sk_state == DCCP_TIME_WAIT) {
 103                 inet_twsk_put(inet_twsk(sk));
 104                 return;
 105         }
 106         seq = dccp_hdr_seq(dh);
 107         if (sk->sk_state == DCCP_NEW_SYN_RECV)
 108                 return dccp_req_err(sk, seq);
 109
 110         bh_lock_sock(sk);
 111         if (sock_owned_by_user(sk))
 112                 __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS);
 113
 114         if (sk->sk_state == DCCP_CLOSED)
 115                 goto out;
 116
 117         dp = dccp_sk(sk);
 118         if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
 119             !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
 120                 __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS);
 121                 goto out;
 122         }
 123
 124         np = inet6_sk(sk);
 125
 126         if (type == NDISC_REDIRECT) {
 127                 if (!sock_owned_by_user(sk)) {
 128                         struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
 129
 130                         if (dst)
 131                                 dst->ops->redirect(dst, sk, skb);
 132                 }
 133                 goto out;
 134         }
 135
 136         if (type == ICMPV6_PKT_TOOBIG) {
 137                 struct dst_entry *dst = NULL;
 138
 139                 if (!ip6_sk_accept_pmtu(sk))
 140                         goto out;
 141
 142                 if (sock_owned_by_user(sk))
 143                         goto out;
 144                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 145                         goto out;
 146
 147                 dst = inet6_csk_update_pmtu(sk, ntohl(info));
 148                 if (!dst)
 149                         goto out;
 150
 151                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
 152                         dccp_sync_mss(sk, dst_mtu(dst));
 153                 goto out;
 154         }
 155
 156         icmpv6_err_convert(type, code, &err);
 157
 158         /* Might be for an request_sock */
 159         switch (sk->sk_state) {
 160         case DCCP_REQUESTING:
 161         case DCCP_RESPOND:  /* Cannot happen.
 162                                It can, it SYNs are crossed. --ANK */
 163                 if (!sock_owned_by_user(sk)) {
 164                         __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS);
 165                         sk->sk_err = err;
 166                         /*
 167                          * Wake people up to see the error
 168                          * (see connect in sock.c)
 169                          */
 170                         sk->sk_error_report(sk);
 171                         dccp_done(sk);
 172                 } else
 173                         sk->sk_err_soft = err;
 174                 goto out;
 175         }
 176
 177         if (!sock_owned_by_user(sk) && np->recverr) {
 178                 sk->sk_err = err;
 179                 sk->sk_error_report(sk);
 180         } else
 181                 sk->sk_err_soft = err;
 182
 183 out:
 184         bh_unlock_sock(sk);
 185         sock_put(sk);
 186 }
 187
 188
 189 static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req)
 190 {
 191         struct inet_request_sock *ireq = inet_rsk(req);
 192         struct ipv6_pinfo *np = inet6_sk(sk);
 193         struct sk_buff *skb;
 194         struct in6_addr *final_p, final;
 195         struct flowi6 fl6;
 196         int err = -1;
 197         struct dst_entry *dst;
 198
 199         memset(&fl6, 0, sizeof(fl6));
 200         fl6.flowi6_proto = IPPROTO_DCCP;
 201         fl6.daddr = ireq->ir_v6_rmt_addr;
 202         fl6.saddr = ireq->ir_v6_loc_addr;
 203         fl6.flowlabel = 0;
 204         fl6.flowi6_oif = ireq->ir_iif;
 205         fl6.fl6_dport = ireq->ir_rmt_port;
 206         fl6.fl6_sport = htons(ireq->ir_num);
 207         security_req_classify_flow(req, flowi6_to_flowi(&fl6));
 208
 209
 210         rcu_read_lock();
 211         final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final);
 212         rcu_read_unlock();
 213
 214         dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 215         if (IS_ERR(dst)) {
 216                 err = PTR_ERR(dst);
 217                 dst = NULL;
 218                 goto done;
 219         }
 220
 221         skb = dccp_make_response(sk, dst, req);
 222         if (skb != NULL) {
 223                 struct dccp_hdr *dh = dccp_hdr(skb);
 224                 struct ipv6_txoptions *opt;
 225
 226                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
 227                                                          &ireq->ir_v6_loc_addr,
 228                                                          &ireq->ir_v6_rmt_addr);
 229                 fl6.daddr = ireq->ir_v6_rmt_addr;
 230                 rcu_read_lock();
 231                 opt = ireq->ipv6_opt;
 232                 if (!opt)
 233                         opt = rcu_dereference(np->opt);
 234                 err = ip6_xmit(sk, skb, &fl6, sk->sk_mark, opt, np->tclass);
 235                 rcu_read_unlock();
 236                 err = net_xmit_eval(err);
 237         }
 238
 239 done:
 240         dst_release(dst);
 241         return err;
 242 }
 243
 244 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 245 {
 246         dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
 247         kfree(inet_rsk(req)->ipv6_opt);
 248         kfree_skb(inet_rsk(req)->pktopts);
 249 }
 250
 251 static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb)
 252 {
 253         const struct ipv6hdr *rxip6h;
 254         struct sk_buff *skb;
 255         struct flowi6 fl6;
 256         struct net *net = dev_net(skb_dst(rxskb)->dev);
 257         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 258         struct dst_entry *dst;
 259
 260         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 261                 return;
 262
 263         if (!ipv6_unicast_destination(rxskb))
 264                 return;
 265
 266         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 267         if (skb == NULL)
 268                 return;
 269
 270         rxip6h = ipv6_hdr(rxskb);
 271         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 272                                                             &rxip6h->daddr);
 273
 274         memset(&fl6, 0, sizeof(fl6));
 275         fl6.daddr = rxip6h->saddr;
 276         fl6.saddr = rxip6h->daddr;
 277
 278         fl6.flowi6_proto = IPPROTO_DCCP;
 279         fl6.flowi6_oif = inet6_iif(rxskb);
 280         fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
 281         fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
 282         security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
 283
 284         /* sk = NULL, but it is safe for now. RST socket required. */
 285         dst = ip6_dst_lookup_flow(sock_net(ctl_sk), ctl_sk, &fl6, NULL);
 286         if (!IS_ERR(dst)) {
 287                 skb_dst_set(skb, dst);
 288                 ip6_xmit(ctl_sk, skb, &fl6, 0, NULL, 0);
 289                 DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
 290                 DCCP_INC_STATS(DCCP_MIB_OUTRSTS);
 291                 return;
 292         }
 293
 294         kfree_skb(skb);
 295 }
 296
 297 static struct request_sock_ops dccp6_request_sock_ops = {
 298         .family         = AF_INET6,
 299         .obj_size       = sizeof(struct dccp6_request_sock),
 300         .rtx_syn_ack    = dccp_v6_send_response,
 301         .send_ack       = dccp_reqsk_send_ack,
 302         .destructor     = dccp_v6_reqsk_destructor,
 303         .send_reset     = dccp_v6_ctl_send_reset,
 304         .syn_ack_timeout = dccp_syn_ack_timeout,
 305 };
 306
 307 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 308 {
 309         struct request_sock *req;
 310         struct dccp_request_sock *dreq;
 311         struct inet_request_sock *ireq;
 312         struct ipv6_pinfo *np = inet6_sk(sk);
 313         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 314         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 315
 316         if (skb->protocol == htons(ETH_P_IP))
 317                 return dccp_v4_conn_request(sk, skb);
 318
 319         if (!ipv6_unicast_destination(skb))
 320                 return 0;       /* discard, don't send a reset here */
 321
 322         if (ipv6_addr_v4mapped(&ipv6_hdr(skb)->saddr)) {
 323                 __IP6_INC_STATS(sock_net(sk), NULL, IPSTATS_MIB_INHDRERRORS);
 324                 return 0;
 325         }
 326
 327         if (dccp_bad_service_code(sk, service)) {
 328                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 329                 goto drop;
 330         }
 331         /*
 332          * There are no SYN attacks on IPv6, yet...
 333          */
 334         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 335         if (inet_csk_reqsk_queue_is_full(sk))
 336                 goto drop;
 337
 338         if (sk_acceptq_is_full(sk))
 339                 goto drop;
 340
 341         req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true);
 342         if (req == NULL)
 343                 goto drop;
 344
 345         if (dccp_reqsk_init(req, dccp_sk(sk), skb))
 346                 goto drop_and_free;
 347
 348         dreq = dccp_rsk(req);
 349         if (dccp_parse_options(sk, dreq, skb))
 350                 goto drop_and_free;
 351
 352         if (security_inet_conn_request(sk, skb, req))
 353                 goto drop_and_free;
 354
 355         ireq = inet_rsk(req);
 356         ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
 357         ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
 358         ireq->ireq_family = AF_INET6;
 359         ireq->ir_mark = inet_request_mark(sk, skb);
 360
 361         if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) ||
 362             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 363             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 364                 refcount_inc(&skb->users);
 365                 ireq->pktopts = skb;
 366         }
 367         ireq->ir_iif = sk->sk_bound_dev_if;
 368
 369         /* So that link locals have meaning */
 370         if (!sk->sk_bound_dev_if &&
 371             ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
 372                 ireq->ir_iif = inet6_iif(skb);
 373
 374         /*
 375          * Step 3: Process LISTEN state
 376          *
 377          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 378          *
 379          * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
 380          */
 381         dreq->dreq_isr     = dcb->dccpd_seq;
 382         dreq->dreq_gsr     = dreq->dreq_isr;
 383         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 384         dreq->dreq_gss     = dreq->dreq_iss;
 385         dreq->dreq_service = service;
 386
 387         if (dccp_v6_send_response(sk, req))
 388                 goto drop_and_free;
 389
 390         inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 391         reqsk_put(req);
 392         return 0;
 393
 394 drop_and_free:
 395         reqsk_free(req);
 396 drop:
 397         __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS);
 398         return -1;
 399 }
 400
 401 static struct sock *dccp_v6_request_recv_sock(const struct sock *sk,
 402                                               struct sk_buff *skb,
 403                                               struct request_sock *req,
 404                                               struct dst_entry *dst,
 405                                               struct request_sock *req_unhash,
 406                                               bool *own_req)
 407 {
 408         struct inet_request_sock *ireq = inet_rsk(req);
 409         struct ipv6_pinfo *newnp;
 410         const struct ipv6_pinfo *np = inet6_sk(sk);
 411         struct ipv6_txoptions *opt;
 412         struct inet_sock *newinet;
 413         struct dccp6_sock *newdp6;
 414         struct sock *newsk;
 415
 416         if (skb->protocol == htons(ETH_P_IP)) {
 417                 /*
 418                  *      v6 mapped
 419                  */
 420                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst,
 421                                                   req_unhash, own_req);
 422                 if (newsk == NULL)
 423                         return NULL;
 424
 425                 newdp6 = (struct dccp6_sock *)newsk;
 426                 newinet = inet_sk(newsk);
 427                 newinet->pinet6 = &newdp6->inet6;
 428                 newnp = inet6_sk(newsk);
 429
 430                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 431
 432                 newnp->saddr = newsk->sk_v6_rcv_saddr;
 433
 434                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 435                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 436                 newnp->pktoptions  = NULL;
 437                 newnp->opt         = NULL;
 438                 newnp->ipv6_mc_list = NULL;
 439                 newnp->ipv6_ac_list = NULL;
 440                 newnp->ipv6_fl_list = NULL;
 441                 newnp->mcast_oif   = inet_iif(skb);
 442                 newnp->mcast_hops  = ip_hdr(skb)->ttl;
 443
 444                 /*
 445                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 446                  * here, dccp_create_openreq_child now does this for us, see the comment in
 447                  * that function for the gory details. -acme
 448                  */
 449
 450                 /* It is tricky place. Until this moment IPv4 tcp
 451                    worked with IPv6 icsk.icsk_af_ops.
 452                    Sync it now.
 453                  */
 454                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 455
 456                 return newsk;
 457         }
 458
 459
 460         if (sk_acceptq_is_full(sk))
 461                 goto out_overflow;
 462
 463         if (!dst) {
 464                 struct flowi6 fl6;
 465
 466                 dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP);
 467                 if (!dst)
 468                         goto out;
 469         }
 470
 471         newsk = dccp_create_openreq_child(sk, req, skb);
 472         if (newsk == NULL)
 473                 goto out_nonewsk;
 474
 475         /*
 476          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 477          * count here, dccp_create_openreq_child now does this for us, see the
 478          * comment in that function for the gory details. -acme
 479          */
 480
 481         ip6_dst_store(newsk, dst, NULL, NULL);
 482         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 483                                                       NETIF_F_TSO);
 484         newdp6 = (struct dccp6_sock *)newsk;
 485         newinet = inet_sk(newsk);
 486         newinet->pinet6 = &newdp6->inet6;
 487         newnp = inet6_sk(newsk);
 488
 489         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 490
 491         newsk->sk_v6_daddr      = ireq->ir_v6_rmt_addr;
 492         newnp->saddr            = ireq->ir_v6_loc_addr;
 493         newsk->sk_v6_rcv_saddr  = ireq->ir_v6_loc_addr;
 494         newsk->sk_bound_dev_if  = ireq->ir_iif;
 495
 496         /* Now IPv6 options...
 497
 498            First: no IPv4 options.
 499          */
 500         newinet->inet_opt = NULL;
 501
 502         /* Clone RX bits */
 503         newnp->rxopt.all = np->rxopt.all;
 504
 505         newnp->ipv6_mc_list = NULL;
 506         newnp->ipv6_ac_list = NULL;
 507         newnp->ipv6_fl_list = NULL;
 508         newnp->pktoptions = NULL;
 509         newnp->opt        = NULL;
 510         newnp->mcast_oif  = inet6_iif(skb);
 511         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 512
 513         /*
 514          * Clone native IPv6 options from listening socket (if any)
 515          *
 516          * Yes, keeping reference count would be much more clever, but we make
 517          * one more one thing there: reattach optmem to newsk.
 518          */
 519         opt = ireq->ipv6_opt;
 520         if (!opt)
 521                 opt = rcu_dereference(np->opt);
 522         if (opt) {
 523                 opt = ipv6_dup_options(newsk, opt);
 524                 RCU_INIT_POINTER(newnp->opt, opt);
 525         }
 526         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 527         if (opt)
 528                 inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
 529                                                     opt->opt_flen;
 530
 531         dccp_sync_mss(newsk, dst_mtu(dst));
 532
 533         newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
 534         newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
 535
 536         if (__inet_inherit_port(sk, newsk) < 0) {
 537                 inet_csk_prepare_forced_close(newsk);
 538                 dccp_done(newsk);
 539                 goto out;
 540         }
 541         *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
 542         /* Clone pktoptions received with SYN, if we own the req */
 543         if (*own_req && ireq->pktopts) {
 544                 newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC);
 545                 consume_skb(ireq->pktopts);
 546                 ireq->pktopts = NULL;
 547                 if (newnp->pktoptions)
 548                         skb_set_owner_r(newnp->pktoptions, newsk);
 549         }
 550
 551         return newsk;
 552
 553 out_overflow:
 554         __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 555 out_nonewsk:
 556         dst_release(dst);
 557 out:
 558         __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS);
 559         return NULL;
 560 }
 561
 562 /* The socket must have it's spinlock held when we get
 563  * here.
 564  *
 565  * We have a potential double-lock case here, so even when
 566  * doing backlog processing we use the BH locking scheme.
 567  * This is because we cannot sleep with the original spinlock
 568  * held.
 569  */
 570 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 571 {
 572         struct ipv6_pinfo *np = inet6_sk(sk);
 573         struct sk_buff *opt_skb = NULL;
 574
 575         /* Imagine: socket is IPv6. IPv4 packet arrives,
 576            goes to IPv4 receive handler and backlogged.
 577            From backlog it always goes here. Kerboom...
 578            Fortunately, dccp_rcv_established and rcv_established
 579            handle them correctly, but it is not case with
 580            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 581          */
 582
 583         if (skb->protocol == htons(ETH_P_IP))
 584                 return dccp_v4_do_rcv(sk, skb);
 585
 586         if (sk_filter(sk, skb))
 587                 goto discard;
 588
 589         /*
 590          * socket locking is here for SMP purposes as backlog rcv is currently
 591          * called with bh processing disabled.
 592          */
 593
 594         /* Do Stevens' IPV6_PKTOPTIONS.
 595
 596            Yes, guys, it is the only place in our code, where we
 597            may make it not affecting IPv4.
 598            The rest of code is protocol independent,
 599            and I do not like idea to uglify IPv4.
 600
 601            Actually, all the idea behind IPV6_PKTOPTIONS
 602            looks not very well thought. For now we latch
 603            options, received in the last packet, enqueued
 604            by tcp. Feel free to propose better solution.
 605                                                --ANK (980728)
 606          */
 607         if (np->rxopt.all)
 608                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 609
 610         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 611                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 612                         goto reset;
 613                 if (opt_skb)
 614                         goto ipv6_pktoptions;
 615                 return 0;
 616         }
 617
 618         /*
 619          *  Step 3: Process LISTEN state
 620          *     If S.state == LISTEN,
 621          *       If P.type == Request or P contains a valid Init Cookie option,
 622          *            (* Must scan the packet's options to check for Init
 623          *               Cookies.  Only Init Cookies are processed here,
 624          *               however; other options are processed in Step 8.  This
 625          *               scan need only be performed if the endpoint uses Init
 626          *               Cookies *)
 627          *            (* Generate a new socket and switch to that socket *)
 628          *            Set S := new socket for this port pair
 629          *            S.state = RESPOND
 630          *            Choose S.ISS (initial seqno) or set from Init Cookies
 631          *            Initialize S.GAR := S.ISS
 632          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 633          *            Continue with S.state == RESPOND
 634          *            (* A Response packet will be generated in Step 11 *)
 635          *       Otherwise,
 636          *            Generate Reset(No Connection) unless P.type == Reset
 637          *            Drop packet and return
 638          *
 639          * NOTE: the check for the packet types is done in
 640          *       dccp_rcv_state_process
 641          */
 642
 643         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 644                 goto reset;
 645         if (opt_skb)
 646                 goto ipv6_pktoptions;
 647         return 0;
 648
 649 reset:
 650         dccp_v6_ctl_send_reset(sk, skb);
 651 discard:
 652         if (opt_skb != NULL)
 653                 __kfree_skb(opt_skb);
 654         kfree_skb(skb);
 655         return 0;
 656
 657 /* Handling IPV6_PKTOPTIONS skb the similar
 658  * way it's done for net/ipv6/tcp_ipv6.c
 659  */
 660 ipv6_pktoptions:
 661         if (!((1 << sk->sk_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) {
 662                 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
 663                         np->mcast_oif = inet6_iif(opt_skb);
 664                 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
 665                         np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
 666                 if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
 667                         np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
 668                 if (np->repflow)
 669                         np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
 670                 if (ipv6_opt_accepted(sk, opt_skb,
 671                                       &DCCP_SKB_CB(opt_skb)->header.h6)) {
 672                         skb_set_owner_r(opt_skb, sk);
 673                         memmove(IP6CB(opt_skb),
 674                                 &DCCP_SKB_CB(opt_skb)->header.h6,
 675                                 sizeof(struct inet6_skb_parm));
 676                         opt_skb = xchg(&np->pktoptions, opt_skb);
 677                 } else {
 678                         __kfree_skb(opt_skb);
 679                         opt_skb = xchg(&np->pktoptions, NULL);
 680                 }
 681         }
 682
 683         kfree_skb(opt_skb);
 684         return 0;
 685 }
 686
 687 static int dccp_v6_rcv(struct sk_buff *skb)
 688 {
 689         const struct dccp_hdr *dh;
 690         bool refcounted;
 691         struct sock *sk;
 692         int min_cov;
 693
 694         /* Step 1: Check header basics */
 695
 696         if (dccp_invalid_packet(skb))
 697                 goto discard_it;
 698
 699         /* Step 1: If header checksum is incorrect, drop packet and return. */
 700         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 701                                      &ipv6_hdr(skb)->daddr)) {
 702                 DCCP_WARN("dropped packet with invalid checksum\n");
 703                 goto discard_it;
 704         }
 705
 706         dh = dccp_hdr(skb);
 707
 708         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 709         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 710
 711         if (dccp_packet_without_ack(skb))
 712                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 713         else
 714                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 715
 716 lookup:
 717         sk = __inet6_lookup_skb(&dccp_hashinfo, skb, __dccp_hdr_len(dh),
 718                                 dh->dccph_sport, dh->dccph_dport,
 719                                 inet6_iif(skb), 0, &refcounted);
 720         if (!sk) {
 721                 dccp_pr_debug("failed to look up flow ID in table and "
 722                               "get corresponding socket\n");
 723                 goto no_dccp_socket;
 724         }
 725
 726         /*
 727          * Step 2:
 728          *      ... or S.state == TIMEWAIT,
 729          *              Generate Reset(No Connection) unless P.type == Reset
 730          *              Drop packet and return
 731          */
 732         if (sk->sk_state == DCCP_TIME_WAIT) {
 733                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 734                 inet_twsk_put(inet_twsk(sk));
 735                 goto no_dccp_socket;
 736         }
 737
 738         if (sk->sk_state == DCCP_NEW_SYN_RECV) {
 739                 struct request_sock *req = inet_reqsk(sk);
 740                 struct sock *nsk;
 741
 742                 sk = req->rsk_listener;
 743                 if (unlikely(sk->sk_state != DCCP_LISTEN)) {
 744                         inet_csk_reqsk_queue_drop_and_put(sk, req);
 745                         goto lookup;
 746                 }
 747                 sock_hold(sk);
 748                 refcounted = true;
 749                 nsk = dccp_check_req(sk, skb, req);
 750                 if (!nsk) {
 751                         reqsk_put(req);
 752                         goto discard_and_relse;
 753                 }
 754                 if (nsk == sk) {
 755                         reqsk_put(req);
 756                 } else if (dccp_child_process(sk, nsk, skb)) {
 757                         dccp_v6_ctl_send_reset(sk, skb);
 758                         goto discard_and_relse;
 759                 } else {
 760                         sock_put(sk);
 761                         return 0;
 762                 }
 763         }
 764         /*
 765          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 766          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 767          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 768          */
 769         min_cov = dccp_sk(sk)->dccps_pcrlen;
 770         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 771                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 772                               dh->dccph_cscov, min_cov);
 773                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 774                 goto discard_and_relse;
 775         }
 776
 777         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 778                 goto discard_and_relse;
 779
 780         return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4,
 781                                 refcounted) ? -1 : 0;
 782
 783 no_dccp_socket:
 784         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 785                 goto discard_it;
 786         /*
 787          * Step 2:
 788          *      If no socket ...
 789          *              Generate Reset(No Connection) unless P.type == Reset
 790          *              Drop packet and return
 791          */
 792         if (dh->dccph_type != DCCP_PKT_RESET) {
 793                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 794                                         DCCP_RESET_CODE_NO_CONNECTION;
 795                 dccp_v6_ctl_send_reset(sk, skb);
 796         }
 797
 798 discard_it:
 799         kfree_skb(skb);
 800         return 0;
 801
 802 discard_and_relse:
 803         if (refcounted)
 804                 sock_put(sk);
 805         goto discard_it;
 806 }
 807
 808 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 809                            int addr_len)
 810 {
 811         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 812         struct inet_connection_sock *icsk = inet_csk(sk);
 813         struct inet_sock *inet = inet_sk(sk);
 814         struct ipv6_pinfo *np = inet6_sk(sk);
 815         struct dccp_sock *dp = dccp_sk(sk);
 816         struct in6_addr *saddr = NULL, *final_p, final;
 817         struct ipv6_txoptions *opt;
 818         struct flowi6 fl6;
 819         struct dst_entry *dst;
 820         int addr_type;
 821         int err;
 822
 823         dp->dccps_role = DCCP_ROLE_CLIENT;
 824
 825         if (addr_len < SIN6_LEN_RFC2133)
 826                 return -EINVAL;
 827
 828         if (usin->sin6_family != AF_INET6)
 829                 return -EAFNOSUPPORT;
 830
 831         memset(&fl6, 0, sizeof(fl6));
 832
 833         if (np->sndflow) {
 834                 fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 835                 IP6_ECN_flow_init(fl6.flowlabel);
 836                 if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
 837                         struct ip6_flowlabel *flowlabel;
 838                         flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
 839                         if (flowlabel == NULL)
 840                                 return -EINVAL;
 841                         fl6_sock_release(flowlabel);
 842                 }
 843         }
 844         /*
 845          * connect() to INADDR_ANY means loopback (BSD'ism).
 846          */
 847         if (ipv6_addr_any(&usin->sin6_addr))
 848                 usin->sin6_addr.s6_addr[15] = 1;
 849
 850         addr_type = ipv6_addr_type(&usin->sin6_addr);
 851
 852         if (addr_type & IPV6_ADDR_MULTICAST)
 853                 return -ENETUNREACH;
 854
 855         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 856                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 857                     usin->sin6_scope_id) {
 858                         /* If interface is set while binding, indices
 859                          * must coincide.
 860                          */
 861                         if (sk->sk_bound_dev_if &&
 862                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 863                                 return -EINVAL;
 864
 865                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 866                 }
 867
 868                 /* Connect to link-local address requires an interface */
 869                 if (!sk->sk_bound_dev_if)
 870                         return -EINVAL;
 871         }
 872
 873         sk->sk_v6_daddr = usin->sin6_addr;
 874         np->flow_label = fl6.flowlabel;
 875
 876         /*
 877          * DCCP over IPv4
 878          */
 879         if (addr_type == IPV6_ADDR_MAPPED) {
 880                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 881                 struct sockaddr_in sin;
 882
 883                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 884
 885                 if (__ipv6_only_sock(sk))
 886                         return -ENETUNREACH;
 887
 888                 sin.sin_family = AF_INET;
 889                 sin.sin_port = usin->sin6_port;
 890                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 891
 892                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 893                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 894
 895                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 896                 if (err) {
 897                         icsk->icsk_ext_hdr_len = exthdrlen;
 898                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 899                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 900                         goto failure;
 901                 }
 902                 np->saddr = sk->sk_v6_rcv_saddr;
 903                 return err;
 904         }
 905
 906         if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 907                 saddr = &sk->sk_v6_rcv_saddr;
 908
 909         fl6.flowi6_proto = IPPROTO_DCCP;
 910         fl6.daddr = sk->sk_v6_daddr;
 911         fl6.saddr = saddr ? *saddr : np->saddr;
 912         fl6.flowi6_oif = sk->sk_bound_dev_if;
 913         fl6.fl6_dport = usin->sin6_port;
 914         fl6.fl6_sport = inet->inet_sport;
 915         security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 916
 917         opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
 918         final_p = fl6_update_dst(&fl6, opt, &final);
 919
 920         dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 921         if (IS_ERR(dst)) {
 922                 err = PTR_ERR(dst);
 923                 goto failure;
 924         }
 925
 926         if (saddr == NULL) {
 927                 saddr = &fl6.saddr;
 928                 sk->sk_v6_rcv_saddr = *saddr;
 929         }
 930
 931         /* set the source address */
 932         np->saddr = *saddr;
 933         inet->inet_rcv_saddr = LOOPBACK4_IPV6;
 934
 935         ip6_dst_store(sk, dst, NULL, NULL);
 936
 937         icsk->icsk_ext_hdr_len = 0;
 938         if (opt)
 939                 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
 940
 941         inet->inet_dport = usin->sin6_port;
 942
 943         dccp_set_state(sk, DCCP_REQUESTING);
 944         err = inet6_hash_connect(&dccp_death_row, sk);
 945         if (err)
 946                 goto late_failure;
 947
 948         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
 949                                                       sk->sk_v6_daddr.s6_addr32,
 950                                                       inet->inet_sport,
 951                                                       inet->inet_dport);
 952         err = dccp_connect(sk);
 953         if (err)
 954                 goto late_failure;
 955
 956         return 0;
 957
 958 late_failure:
 959         dccp_set_state(sk, DCCP_CLOSED);
 960         __sk_dst_reset(sk);
 961 failure:
 962         inet->inet_dport = 0;
 963         sk->sk_route_caps = 0;
 964         return err;
 965 }
 966
 967 static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
 968         .queue_xmit        = inet6_csk_xmit,
 969         .send_check        = dccp_v6_send_check,
 970         .rebuild_header    = inet6_sk_rebuild_header,
 971         .conn_request      = dccp_v6_conn_request,
 972         .syn_recv_sock     = dccp_v6_request_recv_sock,
 973         .net_header_len    = sizeof(struct ipv6hdr),
 974         .setsockopt        = ipv6_setsockopt,
 975         .getsockopt        = ipv6_getsockopt,
 976         .addr2sockaddr     = inet6_csk_addr2sockaddr,
 977         .sockaddr_len      = sizeof(struct sockaddr_in6),
 978 #ifdef CONFIG_COMPAT
 979         .compat_setsockopt = compat_ipv6_setsockopt,
 980         .compat_getsockopt = compat_ipv6_getsockopt,
 981 #endif
 982 };
 983
 984 /*
 985  *      DCCP over IPv4 via INET6 API
 986  */
 987 static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
 988         .queue_xmit        = ip_queue_xmit,
 989         .send_check        = dccp_v4_send_check,
 990         .rebuild_header    = inet_sk_rebuild_header,
 991         .conn_request      = dccp_v6_conn_request,
 992         .syn_recv_sock     = dccp_v6_request_recv_sock,
 993         .net_header_len    = sizeof(struct iphdr),
 994         .setsockopt        = ipv6_setsockopt,
 995         .getsockopt        = ipv6_getsockopt,
 996         .addr2sockaddr     = inet6_csk_addr2sockaddr,
 997         .sockaddr_len      = sizeof(struct sockaddr_in6),
 998 #ifdef CONFIG_COMPAT
 999         .compat_setsockopt = compat_ipv6_setsockopt,
1000         .compat_getsockopt = compat_ipv6_getsockopt,
1001 #endif
1002 };
1003
1004 /* NOTE: A lot of things set to zero explicitly by call to
1005  *       sk_alloc() so need not be done here.
1006  */
1007 static int dccp_v6_init_sock(struct sock *sk)
1008 {
1009         static __u8 dccp_v6_ctl_sock_initialized;
1010         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1011
1012         if (err == 0) {
1013                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1014                         dccp_v6_ctl_sock_initialized = 1;
1015                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1016         }
1017
1018         return err;
1019 }
1020
1021 static void dccp_v6_destroy_sock(struct sock *sk)
1022 {
1023         dccp_destroy_sock(sk);
1024         inet6_destroy_sock(sk);
1025 }
1026
1027 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1028         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1029 };
1030
1031 static struct proto dccp_v6_prot = {
1032         .name              = "DCCPv6",
1033         .owner             = THIS_MODULE,
1034         .close             = dccp_close,
1035         .connect           = dccp_v6_connect,
1036         .disconnect        = dccp_disconnect,
1037         .ioctl             = dccp_ioctl,
1038         .init              = dccp_v6_init_sock,
1039         .setsockopt        = dccp_setsockopt,
1040         .getsockopt        = dccp_getsockopt,
1041         .sendmsg           = dccp_sendmsg,
1042         .recvmsg           = dccp_recvmsg,
1043         .backlog_rcv       = dccp_v6_do_rcv,
1044         .hash              = inet6_hash,
1045         .unhash            = inet_unhash,
1046         .accept            = inet_csk_accept,
1047         .get_port          = inet_csk_get_port,
1048         .shutdown          = dccp_shutdown,
1049         .destroy           = dccp_v6_destroy_sock,
1050         .orphan_count      = &dccp_orphan_count,
1051         .max_header        = MAX_DCCP_HEADER,
1052         .obj_size          = sizeof(struct dccp6_sock),
1053         .slab_flags        = SLAB_TYPESAFE_BY_RCU,
1054         .rsk_prot          = &dccp6_request_sock_ops,
1055         .twsk_prot         = &dccp6_timewait_sock_ops,
1056         .h.hashinfo        = &dccp_hashinfo,
1057 #ifdef CONFIG_COMPAT
1058         .compat_setsockopt = compat_dccp_setsockopt,
1059         .compat_getsockopt = compat_dccp_getsockopt,
1060 #endif
1061 };
1062
1063 static const struct inet6_protocol dccp_v6_protocol = {
1064         .handler        = dccp_v6_rcv,
1065         .err_handler    = dccp_v6_err,
1066         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1067 };
1068
1069 static const struct proto_ops inet6_dccp_ops = {
1070         .family            = PF_INET6,
1071         .owner             = THIS_MODULE,
1072         .release           = inet6_release,
1073         .bind              = inet6_bind,
1074         .connect           = inet_stream_connect,
1075         .socketpair        = sock_no_socketpair,
1076         .accept            = inet_accept,
1077         .getname           = inet6_getname,
1078         .poll              = dccp_poll,
1079         .ioctl             = inet6_ioctl,
1080         .listen            = inet_dccp_listen,
1081         .shutdown          = inet_shutdown,
1082         .setsockopt        = sock_common_setsockopt,
1083         .getsockopt        = sock_common_getsockopt,
1084         .sendmsg           = inet_sendmsg,
1085         .recvmsg           = sock_common_recvmsg,
1086         .mmap              = sock_no_mmap,
1087         .sendpage          = sock_no_sendpage,
1088 #ifdef CONFIG_COMPAT
1089         .compat_setsockopt = compat_sock_common_setsockopt,
1090         .compat_getsockopt = compat_sock_common_getsockopt,
1091 #endif
1092 };
1093
1094 static struct inet_protosw dccp_v6_protosw = {
1095         .type           = SOCK_DCCP,
1096         .protocol       = IPPROTO_DCCP,
1097         .prot           = &dccp_v6_prot,
1098         .ops            = &inet6_dccp_ops,
1099         .flags          = INET_PROTOSW_ICSK,
1100 };
1101
1102 static int __net_init dccp_v6_init_net(struct net *net)
1103 {
1104         if (dccp_hashinfo.bhash == NULL)
1105                 return -ESOCKTNOSUPPORT;
1106
1107         return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1108                                     SOCK_DCCP, IPPROTO_DCCP, net);
1109 }
1110
1111 static void __net_exit dccp_v6_exit_net(struct net *net)
1112 {
1113         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1114 }
1115
1116 static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list)
1117 {
1118         inet_twsk_purge(&dccp_hashinfo, AF_INET6);
1119 }
1120
1121 static struct pernet_operations dccp_v6_ops = {
1122         .init   = dccp_v6_init_net,
1123         .exit   = dccp_v6_exit_net,
1124         .exit_batch = dccp_v6_exit_batch,
1125 };
1126
1127 static int __init dccp_v6_init(void)
1128 {
1129         int err = proto_register(&dccp_v6_prot, 1);
1130
1131         if (err)
1132                 goto out;
1133
1134         inet6_register_protosw(&dccp_v6_protosw);
1135
1136         err = register_pernet_subsys(&dccp_v6_ops);
1137         if (err)
1138                 goto out_destroy_ctl_sock;
1139
1140         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1141         if (err)
1142                 goto out_unregister_proto;
1143
1144 out:
1145         return err;
1146 out_unregister_proto:
1147         unregister_pernet_subsys(&dccp_v6_ops);
1148 out_destroy_ctl_sock:
1149         inet6_unregister_protosw(&dccp_v6_protosw);
1150         proto_unregister(&dccp_v6_prot);
1151         goto out;
1152 }
1153
1154 static void __exit dccp_v6_exit(void)
1155 {
1156         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1157         unregister_pernet_subsys(&dccp_v6_ops);
1158         inet6_unregister_protosw(&dccp_v6_protosw);
1159         proto_unregister(&dccp_v6_prot);
1160 }
1161
1162 module_init(dccp_v6_init);
1163 module_exit(dccp_v6_exit);
1164
1165 /*
1166  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1167  * values directly, Also cover the case where the protocol is not specified,
1168  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1169  */
1170 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1171 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1172 MODULE_LICENSE("GPL");
1173 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1174 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");