git.oblomov.eu Git - linux-2.6/blob - 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/config.h>
  16 #include <linux/module.h>
  17 #include <linux/random.h>
  18 #include <linux/xfrm.h>
  19
  20 #include <net/addrconf.h>
  21 #include <net/inet_common.h>
  22 #include <net/inet_hashtables.h>
  23 #include <net/inet_sock.h>
  24 #include <net/inet6_connection_sock.h>
  25 #include <net/inet6_hashtables.h>
  26 #include <net/ip6_route.h>
  27 #include <net/ipv6.h>
  28 #include <net/protocol.h>
  29 #include <net/transp_v6.h>
  30 #include <net/ip6_checksum.h>
  31 #include <net/xfrm.h>
  32
  33 #include "dccp.h"
  34 #include "ipv6.h"
  35
  36 static void dccp_v6_ctl_send_reset(struct sk_buff *skb);
  37 static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
  38                                    struct request_sock *req);
  39 static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb);
  40
  41 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
  42
  43 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  44 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  45
  46 static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
  47 {
  48         return inet_csk_get_port(&dccp_hashinfo, sk, snum,
  49                                  inet6_csk_bind_conflict);
  50 }
  51
  52 static void dccp_v6_hash(struct sock *sk)
  53 {
  54         if (sk->sk_state != DCCP_CLOSED) {
  55                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
  56                         dccp_prot.hash(sk);
  57                         return;
  58                 }
  59                 local_bh_disable();
  60                 __inet6_hash(&dccp_hashinfo, sk);
  61                 local_bh_enable();
  62         }
  63 }
  64
  65 static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len,
  66                                 struct in6_addr *saddr,
  67                                 struct in6_addr *daddr,
  68                                 unsigned long base)
  69 {
  70         return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base);
  71 }
  72
  73 static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
  74 {
  75         const struct dccp_hdr *dh = dccp_hdr(skb);
  76
  77         if (skb->protocol == htons(ETH_P_IPV6))
  78                 return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
  79                                                     skb->nh.ipv6h->saddr.s6_addr32,
  80                                                     dh->dccph_dport,
  81                                                     dh->dccph_sport);
  82         else
  83                 return secure_dccp_sequence_number(skb->nh.iph->daddr,
  84                                                    skb->nh.iph->saddr,
  85                                                    dh->dccph_dport,
  86                                                    dh->dccph_sport);
  87 }
  88
  89 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
  90                            int addr_len)
  91 {
  92         struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
  93         struct inet_connection_sock *icsk = inet_csk(sk);
  94         struct inet_sock *inet = inet_sk(sk);
  95         struct ipv6_pinfo *np = inet6_sk(sk);
  96         struct dccp_sock *dp = dccp_sk(sk);
  97         struct in6_addr *saddr = NULL, *final_p = NULL, final;
  98         struct flowi fl;
  99         struct dst_entry *dst;
 100         int addr_type;
 101         int err;
 102
 103         dp->dccps_role = DCCP_ROLE_CLIENT;
 104
 105         if (addr_len < SIN6_LEN_RFC2133)
 106                 return -EINVAL;
 107
 108         if (usin->sin6_family != AF_INET6)
 109                 return -EAFNOSUPPORT;
 110
 111         memset(&fl, 0, sizeof(fl));
 112
 113         if (np->sndflow) {
 114                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 115                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 116                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 117                         struct ip6_flowlabel *flowlabel;
 118                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 119                         if (flowlabel == NULL)
 120                                 return -EINVAL;
 121                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 122                         fl6_sock_release(flowlabel);
 123                 }
 124         }
 125
 126         /*
 127          *      connect() to INADDR_ANY means loopback (BSD'ism).
 128          */
 129
 130         if (ipv6_addr_any(&usin->sin6_addr))
 131                 usin->sin6_addr.s6_addr[15] = 0x1;
 132
 133         addr_type = ipv6_addr_type(&usin->sin6_addr);
 134
 135         if(addr_type & IPV6_ADDR_MULTICAST)
 136                 return -ENETUNREACH;
 137
 138         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 139                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 140                     usin->sin6_scope_id) {
 141                         /* If interface is set while binding, indices
 142                          * must coincide.
 143                          */
 144                         if (sk->sk_bound_dev_if &&
 145                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 146                                 return -EINVAL;
 147
 148                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 149                 }
 150
 151                 /* Connect to link-local address requires an interface */
 152                 if (!sk->sk_bound_dev_if)
 153                         return -EINVAL;
 154         }
 155
 156         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 157         np->flow_label = fl.fl6_flowlabel;
 158
 159         /*
 160          *      DCCP over IPv4
 161          */
 162
 163         if (addr_type == IPV6_ADDR_MAPPED) {
 164                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 165                 struct sockaddr_in sin;
 166
 167                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 168
 169                 if (__ipv6_only_sock(sk))
 170                         return -ENETUNREACH;
 171
 172                 sin.sin_family = AF_INET;
 173                 sin.sin_port = usin->sin6_port;
 174                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 175
 176                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 177                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 178
 179                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 180
 181                 if (err) {
 182                         icsk->icsk_ext_hdr_len = exthdrlen;
 183                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 184                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 185                         goto failure;
 186                 } else {
 187                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
 188                                       inet->saddr);
 189                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
 190                                       inet->rcv_saddr);
 191                 }
 192
 193                 return err;
 194         }
 195
 196         if (!ipv6_addr_any(&np->rcv_saddr))
 197                 saddr = &np->rcv_saddr;
 198
 199         fl.proto = IPPROTO_DCCP;
 200         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 201         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 202         fl.oif = sk->sk_bound_dev_if;
 203         fl.fl_ip_dport = usin->sin6_port;
 204         fl.fl_ip_sport = inet->sport;
 205
 206         if (np->opt && np->opt->srcrt) {
 207                 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 208                 ipv6_addr_copy(&final, &fl.fl6_dst);
 209                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 210                 final_p = &final;
 211         }
 212
 213         err = ip6_dst_lookup(sk, &dst, &fl);
 214         if (err)
 215                 goto failure;
 216         if (final_p)
 217                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 218
 219         if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 220                 goto failure;
 221
 222         if (saddr == NULL) {
 223                 saddr = &fl.fl6_src;
 224                 ipv6_addr_copy(&np->rcv_saddr, saddr);
 225         }
 226
 227         /* set the source address */
 228         ipv6_addr_copy(&np->saddr, saddr);
 229         inet->rcv_saddr = LOOPBACK4_IPV6;
 230
 231         ip6_dst_store(sk, dst, NULL);
 232
 233         icsk->icsk_ext_hdr_len = 0;
 234         if (np->opt)
 235                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
 236                                           np->opt->opt_nflen);
 237
 238         inet->dport = usin->sin6_port;
 239
 240         dccp_set_state(sk, DCCP_REQUESTING);
 241         err = inet6_hash_connect(&dccp_death_row, sk);
 242         if (err)
 243                 goto late_failure;
 244         /* FIXME */
 245 #if 0
 246         dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32,
 247                                                        np->daddr.s6_addr32,
 248                                                        inet->sport,
 249                                                        inet->dport);
 250 #endif
 251         err = dccp_connect(sk);
 252         if (err)
 253                 goto late_failure;
 254
 255         return 0;
 256
 257 late_failure:
 258         dccp_set_state(sk, DCCP_CLOSED);
 259         __sk_dst_reset(sk);
 260 failure:
 261         inet->dport = 0;
 262         sk->sk_route_caps = 0;
 263         return err;
 264 }
 265
 266 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 267                         int type, int code, int offset, __u32 info)
 268 {
 269         struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
 270         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
 271         struct ipv6_pinfo *np;
 272         struct sock *sk;
 273         int err;
 274         __u64 seq;
 275
 276         sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
 277                           &hdr->saddr, dh->dccph_sport, skb->dev->ifindex);
 278
 279         if (sk == NULL) {
 280                 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
 281                 return;
 282         }
 283
 284         if (sk->sk_state == DCCP_TIME_WAIT) {
 285                 inet_twsk_put((struct inet_timewait_sock *)sk);
 286                 return;
 287         }
 288
 289         bh_lock_sock(sk);
 290         if (sock_owned_by_user(sk))
 291                 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
 292
 293         if (sk->sk_state == DCCP_CLOSED)
 294                 goto out;
 295
 296         np = inet6_sk(sk);
 297
 298         if (type == ICMPV6_PKT_TOOBIG) {
 299                 struct dst_entry *dst = NULL;
 300
 301                 if (sock_owned_by_user(sk))
 302                         goto out;
 303                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 304                         goto out;
 305
 306                 /* icmp should have updated the destination cache entry */
 307                 dst = __sk_dst_check(sk, np->dst_cookie);
 308
 309                 if (dst == NULL) {
 310                         struct inet_sock *inet = inet_sk(sk);
 311                         struct flowi fl;
 312
 313                         /* BUGGG_FUTURE: Again, it is not clear how
 314                            to handle rthdr case. Ignore this complexity
 315                            for now.
 316                          */
 317                         memset(&fl, 0, sizeof(fl));
 318                         fl.proto = IPPROTO_DCCP;
 319                         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 320                         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 321                         fl.oif = sk->sk_bound_dev_if;
 322                         fl.fl_ip_dport = inet->dport;
 323                         fl.fl_ip_sport = inet->sport;
 324
 325                         if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
 326                                 sk->sk_err_soft = -err;
 327                                 goto out;
 328                         }
 329
 330                         if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 331                                 sk->sk_err_soft = -err;
 332                                 goto out;
 333                         }
 334
 335                 } else
 336                         dst_hold(dst);
 337
 338                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 339                         dccp_sync_mss(sk, dst_mtu(dst));
 340                 } /* else let the usual retransmit timer handle it */
 341                 dst_release(dst);
 342                 goto out;
 343         }
 344
 345         icmpv6_err_convert(type, code, &err);
 346
 347         seq = DCCP_SKB_CB(skb)->dccpd_seq;
 348         /* Might be for an request_sock */
 349         switch (sk->sk_state) {
 350                 struct request_sock *req, **prev;
 351         case DCCP_LISTEN:
 352                 if (sock_owned_by_user(sk))
 353                         goto out;
 354
 355                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 356                                            &hdr->daddr, &hdr->saddr,
 357                                            inet6_iif(skb));
 358                 if (!req)
 359                         goto out;
 360
 361                 /* ICMPs are not backlogged, hence we cannot get
 362                  * an established socket here.
 363                  */
 364                 BUG_TRAP(req->sk == NULL);
 365
 366                 if (seq != dccp_rsk(req)->dreq_iss) {
 367                         NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
 368                         goto out;
 369                 }
 370
 371                 inet_csk_reqsk_queue_drop(sk, req, prev);
 372                 goto out;
 373
 374         case DCCP_REQUESTING:
 375         case DCCP_RESPOND:  /* Cannot happen.
 376                                It can, it SYNs are crossed. --ANK */
 377                 if (!sock_owned_by_user(sk)) {
 378                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 379                         sk->sk_err = err;
 380                         /*
 381                          * Wake people up to see the error
 382                          * (see connect in sock.c)
 383                          */
 384                         sk->sk_error_report(sk);
 385
 386                         dccp_done(sk);
 387                 } else
 388                         sk->sk_err_soft = err;
 389                 goto out;
 390         }
 391
 392         if (!sock_owned_by_user(sk) && np->recverr) {
 393                 sk->sk_err = err;
 394                 sk->sk_error_report(sk);
 395         } else
 396                 sk->sk_err_soft = err;
 397
 398 out:
 399         bh_unlock_sock(sk);
 400         sock_put(sk);
 401 }
 402
 403
 404 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
 405                                  struct dst_entry *dst)
 406 {
 407         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 408         struct ipv6_pinfo *np = inet6_sk(sk);
 409         struct sk_buff *skb;
 410         struct ipv6_txoptions *opt = NULL;
 411         struct in6_addr *final_p = NULL, final;
 412         struct flowi fl;
 413         int err = -1;
 414
 415         memset(&fl, 0, sizeof(fl));
 416         fl.proto = IPPROTO_DCCP;
 417         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 418         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 419         fl.fl6_flowlabel = 0;
 420         fl.oif = ireq6->iif;
 421         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 422         fl.fl_ip_sport = inet_sk(sk)->sport;
 423
 424         if (dst == NULL) {
 425                 opt = np->opt;
 426                 if (opt == NULL &&
 427                     np->rxopt.bits.osrcrt == 2 &&
 428                     ireq6->pktopts) {
 429                         struct sk_buff *pktopts = ireq6->pktopts;
 430                         struct inet6_skb_parm *rxopt = IP6CB(pktopts);
 431                         if (rxopt->srcrt)
 432                                 opt = ipv6_invert_rthdr(sk,
 433                                         (struct ipv6_rt_hdr *)(pktopts->nh.raw +
 434                                                                rxopt->srcrt));
 435                 }
 436
 437                 if (opt && opt->srcrt) {
 438                         struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 439                         ipv6_addr_copy(&final, &fl.fl6_dst);
 440                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 441                         final_p = &final;
 442                 }
 443
 444                 err = ip6_dst_lookup(sk, &dst, &fl);
 445                 if (err)
 446                         goto done;
 447                 if (final_p)
 448                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 449                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 450                         goto done;
 451         }
 452
 453         skb = dccp_make_response(sk, dst, req);
 454         if (skb != NULL) {
 455                 struct dccp_hdr *dh = dccp_hdr(skb);
 456                 dh->dccph_checksum = dccp_v6_check(dh, skb->len,
 457                                                    &ireq6->loc_addr,
 458                                                    &ireq6->rmt_addr,
 459                                                    csum_partial((char *)dh,
 460                                                                 skb->len,
 461                                                                 skb->csum));
 462                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 463                 err = ip6_xmit(sk, skb, &fl, opt, 0);
 464                 if (err == NET_XMIT_CN)
 465                         err = 0;
 466         }
 467
 468 done:
 469         if (opt && opt != np->opt)
 470                 sock_kfree_s(sk, opt, opt->tot_len);
 471         dst_release(dst);
 472         return err;
 473 }
 474
 475 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 476 {
 477         if (inet6_rsk(req)->pktopts != NULL)
 478                 kfree_skb(inet6_rsk(req)->pktopts);
 479 }
 480
 481 static struct request_sock_ops dccp6_request_sock_ops = {
 482         .family         = AF_INET6,
 483         .obj_size       = sizeof(struct dccp6_request_sock),
 484         .rtx_syn_ack    = dccp_v6_send_response,
 485         .send_ack       = dccp_v6_reqsk_send_ack,
 486         .destructor     = dccp_v6_reqsk_destructor,
 487         .send_reset     = dccp_v6_ctl_send_reset,
 488 };
 489
 490 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
 491         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
 492 };
 493
 494 static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
 495 {
 496         struct ipv6_pinfo *np = inet6_sk(sk);
 497         struct dccp_hdr *dh = dccp_hdr(skb);
 498
 499         dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr,
 500                                              len, IPPROTO_DCCP,
 501                                              csum_partial((char *)dh,
 502                                                           dh->dccph_doff << 2,
 503                                                           skb->csum));
 504 }
 505
 506 static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
 507 {
 508         struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
 509         const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
 510                                        sizeof(struct dccp_hdr_ext) +
 511                                        sizeof(struct dccp_hdr_reset);
 512         struct sk_buff *skb;
 513         struct flowi fl;
 514         u64 seqno;
 515
 516         if (rxdh->dccph_type == DCCP_PKT_RESET)
 517                 return;
 518
 519         if (!ipv6_unicast_destination(rxskb))
 520                 return;
 521
 522         /*
 523          * We need to grab some memory, and put together an RST,
 524          * and then put it into the queue to be sent.
 525          */
 526
 527         skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) +
 528                         dccp_hdr_reset_len, GFP_ATOMIC);
 529         if (skb == NULL)
 530                 return;
 531
 532         skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) +
 533                     dccp_hdr_reset_len);
 534
 535         skb->h.raw = skb_push(skb, dccp_hdr_reset_len);
 536         dh = dccp_hdr(skb);
 537         memset(dh, 0, dccp_hdr_reset_len);
 538
 539         /* Swap the send and the receive. */
 540         dh->dccph_type  = DCCP_PKT_RESET;
 541         dh->dccph_sport = rxdh->dccph_dport;
 542         dh->dccph_dport = rxdh->dccph_sport;
 543         dh->dccph_doff  = dccp_hdr_reset_len / 4;
 544         dh->dccph_x     = 1;
 545         dccp_hdr_reset(skb)->dccph_reset_code =
 546                                 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
 547
 548         /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */
 549         seqno = 0;
 550         if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
 551                 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
 552
 553         dccp_hdr_set_seq(dh, seqno);
 554         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
 555                          DCCP_SKB_CB(rxskb)->dccpd_seq);
 556
 557         memset(&fl, 0, sizeof(fl));
 558         ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
 559         ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
 560         dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
 561                                              sizeof(*dh), IPPROTO_DCCP,
 562                                              skb->csum);
 563         fl.proto = IPPROTO_DCCP;
 564         fl.oif = inet6_iif(rxskb);
 565         fl.fl_ip_dport = dh->dccph_dport;
 566         fl.fl_ip_sport = dh->dccph_sport;
 567
 568         /* sk = NULL, but it is safe for now. RST socket required. */
 569         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
 570                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 571                         ip6_xmit(NULL, skb, &fl, NULL, 0);
 572                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 573                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 574                         return;
 575                 }
 576         }
 577
 578         kfree_skb(skb);
 579 }
 580
 581 static void dccp_v6_ctl_send_ack(struct sk_buff *rxskb)
 582 {
 583         struct flowi fl;
 584         struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
 585         const int dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
 586                                      sizeof(struct dccp_hdr_ext) +
 587                                      sizeof(struct dccp_hdr_ack_bits);
 588         struct sk_buff *skb;
 589
 590         skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) +
 591                         dccp_hdr_ack_len, GFP_ATOMIC);
 592         if (skb == NULL)
 593                 return;
 594
 595         skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) +
 596                          dccp_hdr_ack_len);
 597
 598         skb->h.raw = skb_push(skb, dccp_hdr_ack_len);
 599         dh = dccp_hdr(skb);
 600         memset(dh, 0, dccp_hdr_ack_len);
 601
 602         /* Build DCCP header and checksum it. */
 603         dh->dccph_type  = DCCP_PKT_ACK;
 604         dh->dccph_sport = rxdh->dccph_dport;
 605         dh->dccph_dport = rxdh->dccph_sport;
 606         dh->dccph_doff  = dccp_hdr_ack_len / 4;
 607         dh->dccph_x     = 1;
 608
 609         dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq);
 610         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
 611                          DCCP_SKB_CB(rxskb)->dccpd_seq);
 612
 613         memset(&fl, 0, sizeof(fl));
 614         ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
 615         ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
 616
 617         /* FIXME: calculate checksum, IPv4 also should... */
 618
 619         fl.proto = IPPROTO_DCCP;
 620         fl.oif = inet6_iif(rxskb);
 621         fl.fl_ip_dport = dh->dccph_dport;
 622         fl.fl_ip_sport = dh->dccph_sport;
 623
 624         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
 625                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 626                         ip6_xmit(NULL, skb, &fl, NULL, 0);
 627                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 628                         return;
 629                 }
 630         }
 631
 632         kfree_skb(skb);
 633 }
 634
 635 static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
 636                                    struct request_sock *req)
 637 {
 638         dccp_v6_ctl_send_ack(skb);
 639 }
 640
 641 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 642 {
 643         const struct dccp_hdr *dh = dccp_hdr(skb);
 644         const struct ipv6hdr *iph = skb->nh.ipv6h;
 645         struct sock *nsk;
 646         struct request_sock **prev;
 647         /* Find possible connection requests. */
 648         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 649                                                         dh->dccph_sport,
 650                                                         &iph->saddr,
 651                                                         &iph->daddr,
 652                                                         inet6_iif(skb));
 653         if (req != NULL)
 654                 return dccp_check_req(sk, skb, req, prev);
 655
 656         nsk = __inet6_lookup_established(&dccp_hashinfo,
 657                                          &iph->saddr, dh->dccph_sport,
 658                                          &iph->daddr, ntohs(dh->dccph_dport),
 659                                          inet6_iif(skb));
 660
 661         if (nsk != NULL) {
 662                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 663                         bh_lock_sock(nsk);
 664                         return nsk;
 665                 }
 666                 inet_twsk_put((struct inet_timewait_sock *)nsk);
 667                 return NULL;
 668         }
 669
 670         return sk;
 671 }
 672
 673 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 674 {
 675         struct inet_request_sock *ireq;
 676         struct dccp_sock dp;
 677         struct request_sock *req;
 678         struct dccp_request_sock *dreq;
 679         struct inet6_request_sock *ireq6;
 680         struct ipv6_pinfo *np = inet6_sk(sk);
 681         const __u32 service = dccp_hdr_request(skb)->dccph_req_service;
 682         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 683         __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
 684
 685         if (skb->protocol == htons(ETH_P_IP))
 686                 return dccp_v4_conn_request(sk, skb);
 687
 688         if (!ipv6_unicast_destination(skb))
 689                 goto drop;
 690
 691         if (dccp_bad_service_code(sk, service)) {
 692                 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 693                 goto drop;
 694         }
 695         /*
 696          *      There are no SYN attacks on IPv6, yet...
 697          */
 698         if (inet_csk_reqsk_queue_is_full(sk))
 699                 goto drop;
 700
 701         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 702                 goto drop;
 703
 704         req = inet6_reqsk_alloc(sk->sk_prot->rsk_prot);
 705         if (req == NULL)
 706                 goto drop;
 707
 708         /* FIXME: process options */
 709
 710         dccp_openreq_init(req, &dp, skb);
 711
 712         ireq6 = inet6_rsk(req);
 713         ireq = inet_rsk(req);
 714         ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
 715         ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
 716         req->rcv_wnd    = 100; /* Fake, option parsing will get the
 717                                   right value */
 718         ireq6->pktopts  = NULL;
 719
 720         if (ipv6_opt_accepted(sk, skb) ||
 721             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 722             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 723                 atomic_inc(&skb->users);
 724                 ireq6->pktopts = skb;
 725         }
 726         ireq6->iif = sk->sk_bound_dev_if;
 727
 728         /* So that link locals have meaning */
 729         if (!sk->sk_bound_dev_if &&
 730             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 731                 ireq6->iif = inet6_iif(skb);
 732
 733         /*
 734          * Step 3: Process LISTEN state
 735          *
 736          * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 737          *
 738          * In fact we defer setting S.GSR, S.SWL, S.SWH to
 739          * dccp_create_openreq_child.
 740          */
 741         dreq = dccp_rsk(req);
 742         dreq->dreq_isr     = dcb->dccpd_seq;
 743         dreq->dreq_iss     = dccp_v6_init_sequence(sk, skb);
 744         dreq->dreq_service = service;
 745
 746         if (dccp_v6_send_response(sk, req, NULL))
 747                 goto drop_and_free;
 748
 749         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 750         return 0;
 751
 752 drop_and_free:
 753         reqsk_free(req);
 754 drop:
 755         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 756         dcb->dccpd_reset_code = reset_code;
 757         return -1;
 758 }
 759
 760 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 761                                               struct sk_buff *skb,
 762                                               struct request_sock *req,
 763                                               struct dst_entry *dst)
 764 {
 765         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 766         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 767         struct inet_sock *newinet;
 768         struct dccp_sock *newdp;
 769         struct dccp6_sock *newdp6;
 770         struct sock *newsk;
 771         struct ipv6_txoptions *opt;
 772
 773         if (skb->protocol == htons(ETH_P_IP)) {
 774                 /*
 775                  *      v6 mapped
 776                  */
 777
 778                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 779                 if (newsk == NULL)
 780                         return NULL;
 781
 782                 newdp6 = (struct dccp6_sock *)newsk;
 783                 newdp = dccp_sk(newsk);
 784                 newinet = inet_sk(newsk);
 785                 newinet->pinet6 = &newdp6->inet6;
 786                 newnp = inet6_sk(newsk);
 787
 788                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 789
 790                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 791                               newinet->daddr);
 792
 793                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 794                               newinet->saddr);
 795
 796                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 797
 798                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 799                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 800                 newnp->pktoptions  = NULL;
 801                 newnp->opt         = NULL;
 802                 newnp->mcast_oif   = inet6_iif(skb);
 803                 newnp->mcast_hops  = skb->nh.ipv6h->hop_limit;
 804
 805                 /*
 806                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 807                  * here, dccp_create_openreq_child now does this for us, see the comment in
 808                  * that function for the gory details. -acme
 809                  */
 810
 811                 /* It is tricky place. Until this moment IPv4 tcp
 812                    worked with IPv6 icsk.icsk_af_ops.
 813                    Sync it now.
 814                  */
 815                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 816
 817                 return newsk;
 818         }
 819
 820         opt = np->opt;
 821
 822         if (sk_acceptq_is_full(sk))
 823                 goto out_overflow;
 824
 825         if (np->rxopt.bits.osrcrt == 2 &&
 826             opt == NULL && ireq6->pktopts) {
 827                 struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
 828                 if (rxopt->srcrt)
 829                         opt = ipv6_invert_rthdr(sk,
 830                                 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
 831                                                        rxopt->srcrt));
 832         }
 833
 834         if (dst == NULL) {
 835                 struct in6_addr *final_p = NULL, final;
 836                 struct flowi fl;
 837
 838                 memset(&fl, 0, sizeof(fl));
 839                 fl.proto = IPPROTO_DCCP;
 840                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 841                 if (opt && opt->srcrt) {
 842                         struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
 843                         ipv6_addr_copy(&final, &fl.fl6_dst);
 844                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 845                         final_p = &final;
 846                 }
 847                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 848                 fl.oif = sk->sk_bound_dev_if;
 849                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 850                 fl.fl_ip_sport = inet_sk(sk)->sport;
 851
 852                 if (ip6_dst_lookup(sk, &dst, &fl))
 853                         goto out;
 854
 855                 if (final_p)
 856                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 857
 858                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 859                         goto out;
 860         }
 861
 862         newsk = dccp_create_openreq_child(sk, req, skb);
 863         if (newsk == NULL)
 864                 goto out;
 865
 866         /*
 867          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 868          * count here, dccp_create_openreq_child now does this for us, see the
 869          * comment in that function for the gory details. -acme
 870          */
 871
 872         ip6_dst_store(newsk, dst, NULL);
 873         newsk->sk_route_caps = dst->dev->features &
 874                 ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
 875
 876         newdp6 = (struct dccp6_sock *)newsk;
 877         newinet = inet_sk(newsk);
 878         newinet->pinet6 = &newdp6->inet6;
 879         newdp = dccp_sk(newsk);
 880         newnp = inet6_sk(newsk);
 881
 882         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 883
 884         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 885         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 886         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 887         newsk->sk_bound_dev_if = ireq6->iif;
 888
 889         /* Now IPv6 options...
 890
 891            First: no IPv4 options.
 892          */
 893         newinet->opt = NULL;
 894
 895         /* Clone RX bits */
 896         newnp->rxopt.all = np->rxopt.all;
 897
 898         /* Clone pktoptions received with SYN */
 899         newnp->pktoptions = NULL;
 900         if (ireq6->pktopts != NULL) {
 901                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 902                 kfree_skb(ireq6->pktopts);
 903                 ireq6->pktopts = NULL;
 904                 if (newnp->pktoptions)
 905                         skb_set_owner_r(newnp->pktoptions, newsk);
 906         }
 907         newnp->opt        = NULL;
 908         newnp->mcast_oif  = inet6_iif(skb);
 909         newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
 910
 911         /* Clone native IPv6 options from listening socket (if any)
 912
 913            Yes, keeping reference count would be much more clever,
 914            but we make one more one thing there: reattach optmem
 915            to newsk.
 916          */
 917         if (opt) {
 918                 newnp->opt = ipv6_dup_options(newsk, opt);
 919                 if (opt != np->opt)
 920                         sock_kfree_s(sk, opt, opt->tot_len);
 921         }
 922
 923         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 924         if (newnp->opt)
 925                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 926                                                      newnp->opt->opt_flen);
 927
 928         dccp_sync_mss(newsk, dst_mtu(dst));
 929
 930         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 931
 932         __inet6_hash(&dccp_hashinfo, newsk);
 933         inet_inherit_port(&dccp_hashinfo, sk, newsk);
 934
 935         return newsk;
 936
 937 out_overflow:
 938         NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
 939 out:
 940         NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
 941         if (opt && opt != np->opt)
 942                 sock_kfree_s(sk, opt, opt->tot_len);
 943         dst_release(dst);
 944         return NULL;
 945 }
 946
 947 /* The socket must have it's spinlock held when we get
 948  * here.
 949  *
 950  * We have a potential double-lock case here, so even when
 951  * doing backlog processing we use the BH locking scheme.
 952  * This is because we cannot sleep with the original spinlock
 953  * held.
 954  */
 955 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 956 {
 957         struct ipv6_pinfo *np = inet6_sk(sk);
 958         struct sk_buff *opt_skb = NULL;
 959
 960         /* Imagine: socket is IPv6. IPv4 packet arrives,
 961            goes to IPv4 receive handler and backlogged.
 962            From backlog it always goes here. Kerboom...
 963            Fortunately, dccp_rcv_established and rcv_established
 964            handle them correctly, but it is not case with
 965            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 966          */
 967
 968         if (skb->protocol == htons(ETH_P_IP))
 969                 return dccp_v4_do_rcv(sk, skb);
 970
 971         if (sk_filter(sk, skb, 0))
 972                 goto discard;
 973
 974         /*
 975          *      socket locking is here for SMP purposes as backlog rcv
 976          *      is currently called with bh processing disabled.
 977          */
 978
 979         /* Do Stevens' IPV6_PKTOPTIONS.
 980
 981            Yes, guys, it is the only place in our code, where we
 982            may make it not affecting IPv4.
 983            The rest of code is protocol independent,
 984            and I do not like idea to uglify IPv4.
 985
 986            Actually, all the idea behind IPV6_PKTOPTIONS
 987            looks not very well thought. For now we latch
 988            options, received in the last packet, enqueued
 989            by tcp. Feel free to propose better solution.
 990                                                --ANK (980728)
 991          */
 992         if (np->rxopt.all)
 993                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 994
 995         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 996                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 997                         goto reset;
 998                 return 0;
 999         }
1000
1001         if (sk->sk_state == DCCP_LISTEN) {
1002                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
1003                 if (!nsk)
1004                         goto discard;
1005
1006                 /*
1007                  * Queue it on the new socket if the new socket is active,
1008                  * otherwise we just shortcircuit this and continue with
1009                  * the new socket..
1010                  */
1011                 if(nsk != sk) {
1012                         if (dccp_child_process(sk, nsk, skb))
1013                                 goto reset;
1014                         if (opt_skb)
1015                                 __kfree_skb(opt_skb);
1016                         return 0;
1017                 }
1018         }
1019
1020         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
1021                 goto reset;
1022         return 0;
1023
1024 reset:
1025         dccp_v6_ctl_send_reset(skb);
1026 discard:
1027         if (opt_skb)
1028                 __kfree_skb(opt_skb);
1029         kfree_skb(skb);
1030         return 0;
1031 }
1032
1033 static int dccp_v6_rcv(struct sk_buff **pskb)
1034 {
1035         const struct dccp_hdr *dh;
1036         struct sk_buff *skb = *pskb;
1037         struct sock *sk;
1038
1039         /* Step 1: Check header basics: */
1040
1041         if (dccp_invalid_packet(skb))
1042                 goto discard_it;
1043
1044         dh = dccp_hdr(skb);
1045
1046         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(skb);
1047         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
1048
1049         if (dccp_packet_without_ack(skb))
1050                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
1051         else
1052                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
1053
1054         /* Step 2:
1055          *      Look up flow ID in table and get corresponding socket */
1056         sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
1057                             dh->dccph_sport,
1058                             &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
1059                             inet6_iif(skb));
1060         /*
1061          * Step 2:
1062          *      If no socket ...
1063          *              Generate Reset(No Connection) unless P.type == Reset
1064          *              Drop packet and return
1065          */
1066         if (sk == NULL)
1067                 goto no_dccp_socket;
1068
1069         /*
1070          * Step 2:
1071          *      ... or S.state == TIMEWAIT,
1072          *              Generate Reset(No Connection) unless P.type == Reset
1073          *              Drop packet and return
1074          */
1075
1076         if (sk->sk_state == DCCP_TIME_WAIT)
1077                 goto do_time_wait;
1078
1079         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1080                 goto discard_and_relse;
1081
1082         return sk_receive_skb(sk, skb) ? -1 : 0;
1083
1084 no_dccp_socket:
1085         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1086                 goto discard_it;
1087         /*
1088          * Step 2:
1089          *              Generate Reset(No Connection) unless P.type == Reset
1090          *              Drop packet and return
1091          */
1092         if (dh->dccph_type != DCCP_PKT_RESET) {
1093                 DCCP_SKB_CB(skb)->dccpd_reset_code =
1094                                         DCCP_RESET_CODE_NO_CONNECTION;
1095                 dccp_v6_ctl_send_reset(skb);
1096         }
1097 discard_it:
1098
1099         /*
1100          *      Discard frame
1101          */
1102
1103         kfree_skb(skb);
1104         return 0;
1105
1106 discard_and_relse:
1107         sock_put(sk);
1108         goto discard_it;
1109
1110 do_time_wait:
1111         inet_twsk_put((struct inet_timewait_sock *)sk);
1112         goto no_dccp_socket;
1113 }
1114
1115 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1116         .queue_xmit     =       inet6_csk_xmit,
1117         .send_check     =       dccp_v6_send_check,
1118         .rebuild_header =       inet6_sk_rebuild_header,
1119         .conn_request   =       dccp_v6_conn_request,
1120         .syn_recv_sock  =       dccp_v6_request_recv_sock,
1121         .net_header_len =       sizeof(struct ipv6hdr),
1122         .setsockopt     =       ipv6_setsockopt,
1123         .getsockopt     =       ipv6_getsockopt,
1124         .addr2sockaddr  =       inet6_csk_addr2sockaddr,
1125         .sockaddr_len   =       sizeof(struct sockaddr_in6)
1126 };
1127
1128 /*
1129  *      DCCP over IPv4 via INET6 API
1130  */
1131 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1132         .queue_xmit     =       ip_queue_xmit,
1133         .send_check     =       dccp_v4_send_check,
1134         .rebuild_header =       inet_sk_rebuild_header,
1135         .conn_request   =       dccp_v6_conn_request,
1136         .syn_recv_sock  =       dccp_v6_request_recv_sock,
1137         .net_header_len =       sizeof(struct iphdr),
1138         .setsockopt     =       ipv6_setsockopt,
1139         .getsockopt     =       ipv6_getsockopt,
1140         .addr2sockaddr  =       inet6_csk_addr2sockaddr,
1141         .sockaddr_len   =       sizeof(struct sockaddr_in6)
1142 };
1143
1144 /* NOTE: A lot of things set to zero explicitly by call to
1145  *       sk_alloc() so need not be done here.
1146  */
1147 static int dccp_v6_init_sock(struct sock *sk)
1148 {
1149         int err = dccp_v4_init_sock(sk);
1150
1151         if (err == 0)
1152                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1153
1154         return err;
1155 }
1156
1157 static int dccp_v6_destroy_sock(struct sock *sk)
1158 {
1159         dccp_v4_destroy_sock(sk);
1160         return inet6_destroy_sock(sk);
1161 }
1162
1163 static struct proto dccp_v6_prot = {
1164         .name                   = "DCCPv6",
1165         .owner                  = THIS_MODULE,
1166         .close                  = dccp_close,
1167         .connect                = dccp_v6_connect,
1168         .disconnect             = dccp_disconnect,
1169         .ioctl                  = dccp_ioctl,
1170         .init                   = dccp_v6_init_sock,
1171         .setsockopt             = dccp_setsockopt,
1172         .getsockopt             = dccp_getsockopt,
1173         .sendmsg                = dccp_sendmsg,
1174         .recvmsg                = dccp_recvmsg,
1175         .backlog_rcv            = dccp_v6_do_rcv,
1176         .hash                   = dccp_v6_hash,
1177         .unhash                 = dccp_unhash,
1178         .accept                 = inet_csk_accept,
1179         .get_port               = dccp_v6_get_port,
1180         .shutdown               = dccp_shutdown,
1181         .destroy                = dccp_v6_destroy_sock,
1182         .orphan_count           = &dccp_orphan_count,
1183         .max_header             = MAX_DCCP_HEADER,
1184         .obj_size               = sizeof(struct dccp6_sock),
1185         .rsk_prot               = &dccp6_request_sock_ops,
1186         .twsk_prot              = &dccp6_timewait_sock_ops,
1187 };
1188
1189 static struct inet6_protocol dccp_v6_protocol = {
1190         .handler        =       dccp_v6_rcv,
1191         .err_handler    =       dccp_v6_err,
1192         .flags          =       INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1193 };
1194
1195 static struct proto_ops inet6_dccp_ops = {
1196         .family         = PF_INET6,
1197         .owner          = THIS_MODULE,
1198         .release        = inet6_release,
1199         .bind           = inet6_bind,
1200         .connect        = inet_stream_connect,
1201         .socketpair     = sock_no_socketpair,
1202         .accept         = inet_accept,
1203         .getname        = inet6_getname,
1204         .poll           = dccp_poll,
1205         .ioctl          = inet6_ioctl,
1206         .listen         = inet_dccp_listen,
1207         .shutdown       = inet_shutdown,
1208         .setsockopt     = sock_common_setsockopt,
1209         .getsockopt     = sock_common_getsockopt,
1210         .sendmsg        = inet_sendmsg,
1211         .recvmsg        = sock_common_recvmsg,
1212         .mmap           = sock_no_mmap,
1213         .sendpage       = sock_no_sendpage,
1214 };
1215
1216 static struct inet_protosw dccp_v6_protosw = {
1217         .type           = SOCK_DCCP,
1218         .protocol       = IPPROTO_DCCP,
1219         .prot           = &dccp_v6_prot,
1220         .ops            = &inet6_dccp_ops,
1221         .capability     = -1,
1222         .flags          = INET_PROTOSW_ICSK,
1223 };
1224
1225 static int __init dccp_v6_init(void)
1226 {
1227         int err = proto_register(&dccp_v6_prot, 1);
1228
1229         if (err != 0)
1230                 goto out;
1231
1232         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1233         if (err != 0)
1234                 goto out_unregister_proto;
1235
1236         inet6_register_protosw(&dccp_v6_protosw);
1237 out:
1238         return err;
1239 out_unregister_proto:
1240         proto_unregister(&dccp_v6_prot);
1241         goto out;
1242 }
1243
1244 static void __exit dccp_v6_exit(void)
1245 {
1246         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1247         inet6_unregister_protosw(&dccp_v6_protosw);
1248         proto_unregister(&dccp_v6_prot);
1249 }
1250
1251 module_init(dccp_v6_init);
1252 module_exit(dccp_v6_exit);
1253
1254 /*
1255  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1256  * values directly, Also cover the case where the protocol is not specified,
1257  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1258  */
1259 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1260 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1261 MODULE_LICENSE("GPL");
1262 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1263 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");