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