net/dccp/ipv6.c

   1 /*
   2  *      DCCP over IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Based on net/dccp6/ipv6.c
   6  *
   7  *      Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/random.h>
  17 #include <linux/xfrm.h>
  18
  19 #include <net/addrconf.h>
  20 #include <net/inet_common.h>
  21 #include <net/inet_hashtables.h>
  22 #include <net/inet_sock.h>
  23 #include <net/inet6_connection_sock.h>
  24 #include <net/inet6_hashtables.h>
  25 #include <net/ip6_route.h>
  26 #include <net/ipv6.h>
  27 #include <net/protocol.h>
  28 #include <net/transp_v6.h>
  29 #include <net/ip6_checksum.h>
  30 #include <net/xfrm.h>
  31
  32 #include "dccp.h"
  33 #include "ipv6.h"
  34 #include "feat.h"
  35
  36 /* Socket used for sending RSTs and ACKs */
  37 static struct socket *dccp_v6_ctl_socket;
  38
  39 static void dccp_v6_ctl_send_reset(struct sk_buff *skb);
  40 static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
  41                                    struct request_sock *req);
  42 static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb);
  43
  44 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
  45
  46 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  47 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  48
  49 static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
  50 {
  51         return inet_csk_get_port(&dccp_hashinfo, sk, snum,
  52                                  inet6_csk_bind_conflict);
  53 }
  54
  55 static void dccp_v6_hash(struct sock *sk)
  56 {
  57         if (sk->sk_state != DCCP_CLOSED) {
  58                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
  59                         dccp_hash(sk);
  60                         return;
  61                 }
  62                 local_bh_disable();
  63                 __inet6_hash(&dccp_hashinfo, sk);
  64                 local_bh_enable();
  65         }
  66 }
  67
  68 static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len,
  69                                 struct in6_addr *saddr,
  70                                 struct in6_addr *daddr,
  71                                 unsigned long base)
  72 {
  73         return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base);
  74 }
  75
  76 static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
  77 {
  78         const struct dccp_hdr *dh = dccp_hdr(skb);
  79
  80         if (skb->protocol == htons(ETH_P_IPV6))
  81                 return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
  82                                                     skb->nh.ipv6h->saddr.s6_addr32,
  83                                                     dh->dccph_dport,
  84                                                     dh->dccph_sport);
  85
  86         return secure_dccp_sequence_number(skb->nh.iph->daddr,
  87                                            skb->nh.iph->saddr,
  88                                            dh->dccph_dport,
  89                                            dh->dccph_sport);
  90 }
  91
  92 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
  93                            int addr_len)
  94 {
  95         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
  96         struct inet_connection_sock *icsk = inet_csk(sk);
  97         struct inet_sock *inet = inet_sk(sk);
  98         struct ipv6_pinfo *np = inet6_sk(sk);
  99         struct dccp_sock *dp = dccp_sk(sk);
 100         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 101         struct flowi fl;
 102         struct dst_entry *dst;
 103         int addr_type;
 104         int err;
 105
 106         dp->dccps_role = DCCP_ROLE_CLIENT;
 107
 108         if (addr_len < SIN6_LEN_RFC2133)
 109                 return -EINVAL;
 110
 111         if (usin->sin6_family != AF_INET6)
 112                 return -EAFNOSUPPORT;
 113
 114         memset(&fl, 0, sizeof(fl));
 115
 116         if (np->sndflow) {
 117                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 118                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 119                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 120                         struct ip6_flowlabel *flowlabel;
 121                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 122                         if (flowlabel == NULL)
 123                                 return -EINVAL;
 124                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 125                         fl6_sock_release(flowlabel);
 126                 }
 127         }
 128         /*
 129          * connect() to INADDR_ANY means loopback (BSD'ism).
 130          */
 131         if (ipv6_addr_any(&usin->sin6_addr))
 132                 usin->sin6_addr.s6_addr[15] = 1;
 133
 134         addr_type = ipv6_addr_type(&usin->sin6_addr);
 135
 136         if (addr_type & IPV6_ADDR_MULTICAST)
 137                 return -ENETUNREACH;
 138
 139         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 140                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 141                     usin->sin6_scope_id) {
 142                         /* If interface is set while binding, indices
 143                          * must coincide.
 144                          */
 145                         if (sk->sk_bound_dev_if &&
 146                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 147                                 return -EINVAL;
 148
 149                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 150                 }
 151
 152                 /* Connect to link-local address requires an interface */
 153                 if (!sk->sk_bound_dev_if)
 154                         return -EINVAL;
 155         }
 156
 157         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 158         np->flow_label = fl.fl6_flowlabel;
 159
 160         /*
 161          * DCCP over IPv4
 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                 if (err) {
 181                         icsk->icsk_ext_hdr_len = exthdrlen;
 182                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 183                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 184                         goto failure;
 185                 } else {
 186                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
 187                                       inet->saddr);
 188                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
 189                                       inet->rcv_saddr);
 190                 }
 191
 192                 return err;
 193         }
 194
 195         if (!ipv6_addr_any(&np->rcv_saddr))
 196                 saddr = &np->rcv_saddr;
 197
 198         fl.proto = IPPROTO_DCCP;
 199         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 200         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 201         fl.oif = sk->sk_bound_dev_if;
 202         fl.fl_ip_dport = usin->sin6_port;
 203         fl.fl_ip_sport = inet->sport;
 204         security_sk_classify_flow(sk, &fl);
 205
 206         if (np->opt != NULL && np->opt->srcrt != NULL) {
 207                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 208
 209                 ipv6_addr_copy(&final, &fl.fl6_dst);
 210                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 211                 final_p = &final;
 212         }
 213
 214         err = ip6_dst_lookup(sk, &dst, &fl);
 215         if (err)
 216                 goto failure;
 217
 218         if (final_p)
 219                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 220
 221         err = xfrm_lookup(&dst, &fl, sk, 0);
 222         if (err < 0)
 223                 goto failure;
 224
 225         if (saddr == NULL) {
 226                 saddr = &fl.fl6_src;
 227                 ipv6_addr_copy(&np->rcv_saddr, saddr);
 228         }
 229
 230         /* set the source address */
 231         ipv6_addr_copy(&np->saddr, saddr);
 232         inet->rcv_saddr = LOOPBACK4_IPV6;
 233
 234         __ip6_dst_store(sk, dst, NULL, NULL);
 235
 236         icsk->icsk_ext_hdr_len = 0;
 237         if (np->opt != NULL)
 238                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
 239                                           np->opt->opt_nflen);
 240
 241         inet->dport = usin->sin6_port;
 242
 243         dccp_set_state(sk, DCCP_REQUESTING);
 244         err = inet6_hash_connect(&dccp_death_row, sk);
 245         if (err)
 246                 goto late_failure;
 247         /* FIXME */
 248 #if 0
 249         dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32,
 250                                                        np->daddr.s6_addr32,
 251                                                        inet->sport,
 252                                                        inet->dport);
 253 #endif
 254         err = dccp_connect(sk);
 255         if (err)
 256                 goto late_failure;
 257
 258         return 0;
 259
 260 late_failure:
 261         dccp_set_state(sk, DCCP_CLOSED);
 262         __sk_dst_reset(sk);
 263 failure:
 264         inet->dport = 0;
 265         sk->sk_route_caps = 0;
 266         return err;
 267 }
 268
 269 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 270                         int type, int code, int offset, __be32 info)
 271 {
 272         struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
 273         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
 274         struct ipv6_pinfo *np;
 275         struct sock *sk;
 276         int err;
 277         __u64 seq;
 278
 279         sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
 280                           &hdr->saddr, dh->dccph_sport, skb->dev->ifindex);
 281
 282         if (sk == NULL) {
 283                 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
 284                 return;
 285         }
 286
 287         if (sk->sk_state == DCCP_TIME_WAIT) {
 288                 inet_twsk_put(inet_twsk(sk));
 289                 return;
 290         }
 291
 292         bh_lock_sock(sk);
 293         if (sock_owned_by_user(sk))
 294                 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
 295
 296         if (sk->sk_state == DCCP_CLOSED)
 297                 goto out;
 298
 299         np = inet6_sk(sk);
 300
 301         if (type == ICMPV6_PKT_TOOBIG) {
 302                 struct dst_entry *dst = NULL;
 303
 304                 if (sock_owned_by_user(sk))
 305                         goto out;
 306                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 307                         goto out;
 308
 309                 /* icmp should have updated the destination cache entry */
 310                 dst = __sk_dst_check(sk, np->dst_cookie);
 311                 if (dst == NULL) {
 312                         struct inet_sock *inet = inet_sk(sk);
 313                         struct flowi fl;
 314
 315                         /* BUGGG_FUTURE: Again, it is not clear how
 316                            to handle rthdr case. Ignore this complexity
 317                            for now.
 318                          */
 319                         memset(&fl, 0, sizeof(fl));
 320                         fl.proto = IPPROTO_DCCP;
 321                         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 322                         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 323                         fl.oif = sk->sk_bound_dev_if;
 324                         fl.fl_ip_dport = inet->dport;
 325                         fl.fl_ip_sport = inet->sport;
 326                         security_sk_classify_flow(sk, &fl);
 327
 328                         err = ip6_dst_lookup(sk, &dst, &fl);
 329                         if (err) {
 330                                 sk->sk_err_soft = -err;
 331                                 goto out;
 332                         }
 333
 334                         err = xfrm_lookup(&dst, &fl, sk, 0);
 335                         if (err < 0) {
 336                                 sk->sk_err_soft = -err;
 337                                 goto out;
 338                         }
 339                 } else
 340                         dst_hold(dst);
 341
 342                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 343                         dccp_sync_mss(sk, dst_mtu(dst));
 344                 } /* else let the usual retransmit timer handle it */
 345                 dst_release(dst);
 346                 goto out;
 347         }
 348
 349         icmpv6_err_convert(type, code, &err);
 350
 351         seq = DCCP_SKB_CB(skb)->dccpd_seq;
 352         /* Might be for an request_sock */
 353         switch (sk->sk_state) {
 354                 struct request_sock *req, **prev;
 355         case DCCP_LISTEN:
 356                 if (sock_owned_by_user(sk))
 357                         goto out;
 358
 359                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 360                                            &hdr->daddr, &hdr->saddr,
 361                                            inet6_iif(skb));
 362                 if (req == NULL)
 363                         goto out;
 364
 365                 /*
 366                  * ICMPs are not backlogged, hence we cannot get an established
 367                  * socket here.
 368                  */
 369                 BUG_TRAP(req->sk == NULL);
 370
 371                 if (seq != dccp_rsk(req)->dreq_iss) {
 372                         NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
 373                         goto out;
 374                 }
 375
 376                 inet_csk_reqsk_queue_drop(sk, req, prev);
 377                 goto out;
 378
 379         case DCCP_REQUESTING:
 380         case DCCP_RESPOND:  /* Cannot happen.
 381                                It can, it SYNs are crossed. --ANK */
 382                 if (!sock_owned_by_user(sk)) {
 383                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 384                         sk->sk_err = err;
 385                         /*
 386                          * Wake people up to see the error
 387                          * (see connect in sock.c)
 388                          */
 389                         sk->sk_error_report(sk);
 390                         dccp_done(sk);
 391                 } else
 392                         sk->sk_err_soft = err;
 393                 goto out;
 394         }
 395
 396         if (!sock_owned_by_user(sk) && np->recverr) {
 397                 sk->sk_err = err;
 398                 sk->sk_error_report(sk);
 399         } else
 400                 sk->sk_err_soft = err;
 401
 402 out:
 403         bh_unlock_sock(sk);
 404         sock_put(sk);
 405 }
 406
 407
 408 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
 409                                  struct dst_entry *dst)
 410 {
 411         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 412         struct ipv6_pinfo *np = inet6_sk(sk);
 413         struct sk_buff *skb;
 414         struct ipv6_txoptions *opt = NULL;
 415         struct in6_addr *final_p = NULL, final;
 416         struct flowi fl;
 417         int err = -1;
 418
 419         memset(&fl, 0, sizeof(fl));
 420         fl.proto = IPPROTO_DCCP;
 421         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 422         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 423         fl.fl6_flowlabel = 0;
 424         fl.oif = ireq6->iif;
 425         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 426         fl.fl_ip_sport = inet_sk(sk)->sport;
 427         security_req_classify_flow(req, &fl);
 428
 429         if (dst == NULL) {
 430                 opt = np->opt;
 431                 if (opt == NULL &&
 432                     np->rxopt.bits.osrcrt == 2 &&
 433                     ireq6->pktopts) {
 434                         struct sk_buff *pktopts = ireq6->pktopts;
 435                         struct inet6_skb_parm *rxopt = IP6CB(pktopts);
 436
 437                         if (rxopt->srcrt)
 438                                 opt = ipv6_invert_rthdr(sk,
 439                                         (struct ipv6_rt_hdr *)(pktopts->nh.raw +
 440                                                                rxopt->srcrt));
 441                 }
 442
 443                 if (opt != NULL && opt->srcrt != NULL) {
 444                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 445
 446                         ipv6_addr_copy(&final, &fl.fl6_dst);
 447                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 448                         final_p = &final;
 449                 }
 450
 451                 err = ip6_dst_lookup(sk, &dst, &fl);
 452                 if (err)
 453                         goto done;
 454
 455                 if (final_p)
 456                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 457
 458                 err = xfrm_lookup(&dst, &fl, sk, 0);
 459                 if (err < 0)
 460                         goto done;
 461         }
 462
 463         skb = dccp_make_response(sk, dst, req);
 464         if (skb != NULL) {
 465                 struct dccp_hdr *dh = dccp_hdr(skb);
 466
 467                 dh->dccph_checksum = dccp_v6_check(dh, skb->len,
 468                                                    &ireq6->loc_addr,
 469                                                    &ireq6->rmt_addr,
 470                                                    csum_partial((char *)dh,
 471                                                                 skb->len,
 472                                                                 skb->csum));
 473                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 474                 err = ip6_xmit(sk, skb, &fl, opt, 0);
 475                 if (err == NET_XMIT_CN)
 476                         err = 0;
 477         }
 478
 479 done:
 480         if (opt != NULL && opt != np->opt)
 481                 sock_kfree_s(sk, opt, opt->tot_len);
 482         dst_release(dst);
 483         return err;
 484 }
 485
 486 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 487 {
 488         if (inet6_rsk(req)->pktopts != NULL)
 489                 kfree_skb(inet6_rsk(req)->pktopts);
 490 }
 491
 492 static struct request_sock_ops dccp6_request_sock_ops = {
 493         .family         = AF_INET6,
 494         .obj_size       = sizeof(struct dccp6_request_sock),
 495         .rtx_syn_ack    = dccp_v6_send_response,
 496         .send_ack       = dccp_v6_reqsk_send_ack,
 497         .destructor     = dccp_v6_reqsk_destructor,
 498         .send_reset     = dccp_v6_ctl_send_reset,
 499 };
 500
 501 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
 502         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
 503 };
 504
 505 static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
 506 {
 507         struct ipv6_pinfo *np = inet6_sk(sk);
 508         struct dccp_hdr *dh = dccp_hdr(skb);
 509
 510         dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr,
 511                                              len, IPPROTO_DCCP,
 512                                              csum_partial((char *)dh,
 513                                                           dh->dccph_doff << 2,
 514                                                           skb->csum));
 515 }
 516
 517 static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
 518 {
 519         struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
 520         const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
 521                                        sizeof(struct dccp_hdr_ext) +
 522                                        sizeof(struct dccp_hdr_reset);
 523         struct sk_buff *skb;
 524         struct flowi fl;
 525         u64 seqno;
 526
 527         if (rxdh->dccph_type == DCCP_PKT_RESET)
 528                 return;
 529
 530         if (!ipv6_unicast_destination(rxskb))
 531                 return;
 532
 533         skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
 534                         GFP_ATOMIC);
 535         if (skb == NULL)
 536                 return;
 537
 538         skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
 539
 540         skb->h.raw = skb_push(skb, dccp_hdr_reset_len);
 541         dh = dccp_hdr(skb);
 542         memset(dh, 0, dccp_hdr_reset_len);
 543
 544         /* Swap the send and the receive. */
 545         dh->dccph_type  = DCCP_PKT_RESET;
 546         dh->dccph_sport = rxdh->dccph_dport;
 547         dh->dccph_dport = rxdh->dccph_sport;
 548         dh->dccph_doff  = dccp_hdr_reset_len / 4;
 549         dh->dccph_x     = 1;
 550         dccp_hdr_reset(skb)->dccph_reset_code =
 551                                 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
 552
 553         /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */
 554         seqno = 0;
 555         if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
 556                 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
 557
 558         dccp_hdr_set_seq(dh, seqno);
 559         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
 560                          DCCP_SKB_CB(rxskb)->dccpd_seq);
 561
 562         memset(&fl, 0, sizeof(fl));
 563         ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
 564         ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
 565         dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
 566                                              sizeof(*dh), IPPROTO_DCCP,
 567                                              skb->csum);
 568         fl.proto = IPPROTO_DCCP;
 569         fl.oif = inet6_iif(rxskb);
 570         fl.fl_ip_dport = dh->dccph_dport;
 571         fl.fl_ip_sport = dh->dccph_sport;
 572         security_skb_classify_flow(rxskb, &fl);
 573
 574         /* sk = NULL, but it is safe for now. RST socket required. */
 575         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
 576                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 577                         ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
 578                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 579                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 580                         return;
 581                 }
 582         }
 583
 584         kfree_skb(skb);
 585 }
 586
 587 static void dccp_v6_reqsk_send_ack(struct sk_buff *rxskb,
 588                                    struct request_sock *req)
 589 {
 590         struct flowi fl;
 591         struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
 592         const u32 dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
 593                                      sizeof(struct dccp_hdr_ext) +
 594                                      sizeof(struct dccp_hdr_ack_bits);
 595         struct sk_buff *skb;
 596
 597         skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
 598                         GFP_ATOMIC);
 599         if (skb == NULL)
 600                 return;
 601
 602         skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
 603
 604         skb->h.raw = skb_push(skb, dccp_hdr_ack_len);
 605         dh = dccp_hdr(skb);
 606         memset(dh, 0, dccp_hdr_ack_len);
 607
 608         /* Build DCCP header and checksum it. */
 609         dh->dccph_type  = DCCP_PKT_ACK;
 610         dh->dccph_sport = rxdh->dccph_dport;
 611         dh->dccph_dport = rxdh->dccph_sport;
 612         dh->dccph_doff  = dccp_hdr_ack_len / 4;
 613         dh->dccph_x     = 1;
 614
 615         dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq);
 616         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
 617                          DCCP_SKB_CB(rxskb)->dccpd_seq);
 618
 619         memset(&fl, 0, sizeof(fl));
 620         ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
 621         ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
 622
 623         /* FIXME: calculate checksum, IPv4 also should... */
 624
 625         fl.proto = IPPROTO_DCCP;
 626         fl.oif = inet6_iif(rxskb);
 627         fl.fl_ip_dport = dh->dccph_dport;
 628         fl.fl_ip_sport = dh->dccph_sport;
 629         security_req_classify_flow(req, &fl);
 630
 631         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
 632                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 633                         ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
 634                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 635                         return;
 636                 }
 637         }
 638
 639         kfree_skb(skb);
 640 }
 641
 642 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 643 {
 644         const struct dccp_hdr *dh = dccp_hdr(skb);
 645         const struct ipv6hdr *iph = skb->nh.ipv6h;
 646         struct sock *nsk;
 647         struct request_sock **prev;
 648         /* Find possible connection requests. */
 649         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 650                                                         dh->dccph_sport,
 651                                                         &iph->saddr,
 652                                                         &iph->daddr,
 653                                                         inet6_iif(skb));
 654         if (req != NULL)
 655                 return dccp_check_req(sk, skb, req, prev);
 656
 657         nsk = __inet6_lookup_established(&dccp_hashinfo,
 658                                          &iph->saddr, dh->dccph_sport,
 659                                          &iph->daddr, ntohs(dh->dccph_dport),
 660                                          inet6_iif(skb));
 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(inet_twsk(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 __be32 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         if (security_inet_conn_request(sk, skb, req))
 713                 goto drop_and_free;
 714
 715         ireq6 = inet6_rsk(req);
 716         ireq = inet_rsk(req);
 717         ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
 718         ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
 719         req->rcv_wnd    = dccp_feat_default_sequence_window;
 720         ireq6->pktopts  = NULL;
 721
 722         if (ipv6_opt_accepted(sk, skb) ||
 723             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 724             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 725                 atomic_inc(&skb->users);
 726                 ireq6->pktopts = skb;
 727         }
 728         ireq6->iif = sk->sk_bound_dev_if;
 729
 730         /* So that link locals have meaning */
 731         if (!sk->sk_bound_dev_if &&
 732             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 733                 ireq6->iif = inet6_iif(skb);
 734
 735         /*
 736          * Step 3: Process LISTEN state
 737          *
 738          * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 739          *
 740          * In fact we defer setting S.GSR, S.SWL, S.SWH to
 741          * dccp_create_openreq_child.
 742          */
 743         dreq = dccp_rsk(req);
 744         dreq->dreq_isr     = dcb->dccpd_seq;
 745         dreq->dreq_iss     = dccp_v6_init_sequence(sk, skb);
 746         dreq->dreq_service = service;
 747
 748         if (dccp_v6_send_response(sk, req, NULL))
 749                 goto drop_and_free;
 750
 751         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 752         return 0;
 753
 754 drop_and_free:
 755         reqsk_free(req);
 756 drop:
 757         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 758         dcb->dccpd_reset_code = reset_code;
 759         return -1;
 760 }
 761
 762 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 763                                               struct sk_buff *skb,
 764                                               struct request_sock *req,
 765                                               struct dst_entry *dst)
 766 {
 767         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 768         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 769         struct inet_sock *newinet;
 770         struct dccp_sock *newdp;
 771         struct dccp6_sock *newdp6;
 772         struct sock *newsk;
 773         struct ipv6_txoptions *opt;
 774
 775         if (skb->protocol == htons(ETH_P_IP)) {
 776                 /*
 777                  *      v6 mapped
 778                  */
 779                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 780                 if (newsk == NULL)
 781                         return NULL;
 782
 783                 newdp6 = (struct dccp6_sock *)newsk;
 784                 newdp = dccp_sk(newsk);
 785                 newinet = inet_sk(newsk);
 786                 newinet->pinet6 = &newdp6->inet6;
 787                 newnp = inet6_sk(newsk);
 788
 789                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 790
 791                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 792                               newinet->daddr);
 793
 794                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 795                               newinet->saddr);
 796
 797                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 798
 799                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 800                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 801                 newnp->pktoptions  = NULL;
 802                 newnp->opt         = NULL;
 803                 newnp->mcast_oif   = inet6_iif(skb);
 804                 newnp->mcast_hops  = skb->nh.ipv6h->hop_limit;
 805
 806                 /*
 807                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 808                  * here, dccp_create_openreq_child now does this for us, see the comment in
 809                  * that function for the gory details. -acme
 810                  */
 811
 812                 /* It is tricky place. Until this moment IPv4 tcp
 813                    worked with IPv6 icsk.icsk_af_ops.
 814                    Sync it now.
 815                  */
 816                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 817
 818                 return newsk;
 819         }
 820
 821         opt = np->opt;
 822
 823         if (sk_acceptq_is_full(sk))
 824                 goto out_overflow;
 825
 826         if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) {
 827                 const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
 828
 829                 if (rxopt->srcrt)
 830                         opt = ipv6_invert_rthdr(sk,
 831                                 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
 832                                                        rxopt->srcrt));
 833         }
 834
 835         if (dst == NULL) {
 836                 struct in6_addr *final_p = NULL, final;
 837                 struct flowi fl;
 838
 839                 memset(&fl, 0, sizeof(fl));
 840                 fl.proto = IPPROTO_DCCP;
 841                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 842                 if (opt != NULL && opt->srcrt != NULL) {
 843                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 844
 845                         ipv6_addr_copy(&final, &fl.fl6_dst);
 846                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 847                         final_p = &final;
 848                 }
 849                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 850                 fl.oif = sk->sk_bound_dev_if;
 851                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 852                 fl.fl_ip_sport = inet_sk(sk)->sport;
 853                 security_sk_classify_flow(sk, &fl);
 854
 855                 if (ip6_dst_lookup(sk, &dst, &fl))
 856                         goto out;
 857
 858                 if (final_p)
 859                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 860
 861                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 862                         goto out;
 863         }
 864
 865         newsk = dccp_create_openreq_child(sk, req, skb);
 866         if (newsk == NULL)
 867                 goto out;
 868
 869         /*
 870          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 871          * count here, dccp_create_openreq_child now does this for us, see the
 872          * comment in that function for the gory details. -acme
 873          */
 874
 875         __ip6_dst_store(newsk, dst, NULL, NULL);
 876         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 877                                                       NETIF_F_TSO);
 878         newdp6 = (struct dccp6_sock *)newsk;
 879         newinet = inet_sk(newsk);
 880         newinet->pinet6 = &newdp6->inet6;
 881         newdp = dccp_sk(newsk);
 882         newnp = inet6_sk(newsk);
 883
 884         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 885
 886         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 887         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 888         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 889         newsk->sk_bound_dev_if = ireq6->iif;
 890
 891         /* Now IPv6 options...
 892
 893            First: no IPv4 options.
 894          */
 895         newinet->opt = NULL;
 896
 897         /* Clone RX bits */
 898         newnp->rxopt.all = np->rxopt.all;
 899
 900         /* Clone pktoptions received with SYN */
 901         newnp->pktoptions = NULL;
 902         if (ireq6->pktopts != NULL) {
 903                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 904                 kfree_skb(ireq6->pktopts);
 905                 ireq6->pktopts = NULL;
 906                 if (newnp->pktoptions)
 907                         skb_set_owner_r(newnp->pktoptions, newsk);
 908         }
 909         newnp->opt        = NULL;
 910         newnp->mcast_oif  = inet6_iif(skb);
 911         newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
 912
 913         /*
 914          * Clone native IPv6 options from listening socket (if any)
 915          *
 916          * Yes, keeping reference count would be much more clever, but we make
 917          * one more one thing there: reattach optmem to newsk.
 918          */
 919         if (opt != NULL) {
 920                 newnp->opt = ipv6_dup_options(newsk, opt);
 921                 if (opt != np->opt)
 922                         sock_kfree_s(sk, opt, opt->tot_len);
 923         }
 924
 925         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 926         if (newnp->opt != NULL)
 927                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 928                                                      newnp->opt->opt_flen);
 929
 930         dccp_sync_mss(newsk, dst_mtu(dst));
 931
 932         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 933
 934         __inet6_hash(&dccp_hashinfo, newsk);
 935         inet_inherit_port(&dccp_hashinfo, sk, newsk);
 936
 937         return newsk;
 938
 939 out_overflow:
 940         NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
 941 out:
 942         NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
 943         if (opt != NULL && opt != np->opt)
 944                 sock_kfree_s(sk, opt, opt->tot_len);
 945         dst_release(dst);
 946         return NULL;
 947 }
 948
 949 /* The socket must have it's spinlock held when we get
 950  * here.
 951  *
 952  * We have a potential double-lock case here, so even when
 953  * doing backlog processing we use the BH locking scheme.
 954  * This is because we cannot sleep with the original spinlock
 955  * held.
 956  */
 957 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 958 {
 959         struct ipv6_pinfo *np = inet6_sk(sk);
 960         struct sk_buff *opt_skb = NULL;
 961
 962         /* Imagine: socket is IPv6. IPv4 packet arrives,
 963            goes to IPv4 receive handler and backlogged.
 964            From backlog it always goes here. Kerboom...
 965            Fortunately, dccp_rcv_established and rcv_established
 966            handle them correctly, but it is not case with
 967            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 968          */
 969
 970         if (skb->protocol == htons(ETH_P_IP))
 971                 return dccp_v4_do_rcv(sk, skb);
 972
 973         if (sk_filter(sk, skb))
 974                 goto discard;
 975
 976         /*
 977          * socket locking is here for SMP purposes as backlog rcv is currently
 978          * called with bh processing disabled.
 979          */
 980
 981         /* Do Stevens' IPV6_PKTOPTIONS.
 982
 983            Yes, guys, it is the only place in our code, where we
 984            may make it not affecting IPv4.
 985            The rest of code is protocol independent,
 986            and I do not like idea to uglify IPv4.
 987
 988            Actually, all the idea behind IPV6_PKTOPTIONS
 989            looks not very well thought. For now we latch
 990            options, received in the last packet, enqueued
 991            by tcp. Feel free to propose better solution.
 992                                                --ANK (980728)
 993          */
 994         if (np->rxopt.all)
 995                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 996
 997         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 998                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 999                         goto reset;
1000                 return 0;
1001         }
1002
1003         if (sk->sk_state == DCCP_LISTEN) {
1004                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
1005
1006                 if (nsk == NULL)
1007                         goto discard;
1008                 /*
1009                  * Queue it on the new socket if the new socket is active,
1010                  * otherwise we just shortcircuit this and continue with
1011                  * the new socket..
1012                  */
1013                 if (nsk != sk) {
1014                         if (dccp_child_process(sk, nsk, skb))
1015                                 goto reset;
1016                         if (opt_skb != NULL)
1017                                 __kfree_skb(opt_skb);
1018                         return 0;
1019                 }
1020         }
1021
1022         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
1023                 goto reset;
1024         return 0;
1025
1026 reset:
1027         dccp_v6_ctl_send_reset(skb);
1028 discard:
1029         if (opt_skb != NULL)
1030                 __kfree_skb(opt_skb);
1031         kfree_skb(skb);
1032         return 0;
1033 }
1034
1035 static int dccp_v6_rcv(struct sk_buff **pskb)
1036 {
1037         const struct dccp_hdr *dh;
1038         struct sk_buff *skb = *pskb;
1039         struct sock *sk;
1040
1041         /* Step 1: Check header basics: */
1042
1043         if (dccp_invalid_packet(skb))
1044                 goto discard_it;
1045
1046         dh = dccp_hdr(skb);
1047
1048         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(skb);
1049         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
1050
1051         if (dccp_packet_without_ack(skb))
1052                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
1053         else
1054                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
1055
1056         /* Step 2:
1057          *      Look up flow ID in table and get corresponding socket */
1058         sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
1059                             dh->dccph_sport,
1060                             &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
1061                             inet6_iif(skb));
1062         /*
1063          * Step 2:
1064          *      If no socket ...
1065          *              Generate Reset(No Connection) unless P.type == Reset
1066          *              Drop packet and return
1067          */
1068         if (sk == NULL)
1069                 goto no_dccp_socket;
1070
1071         /*
1072          * Step 2:
1073          *      ... or S.state == TIMEWAIT,
1074          *              Generate Reset(No Connection) unless P.type == Reset
1075          *              Drop packet and return
1076          */
1077         if (sk->sk_state == DCCP_TIME_WAIT)
1078                 goto do_time_wait;
1079
1080         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1081                 goto discard_and_relse;
1082
1083         return sk_receive_skb(sk, skb) ? -1 : 0;
1084
1085 no_dccp_socket:
1086         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1087                 goto discard_it;
1088         /*
1089          * Step 2:
1090          *              Generate Reset(No Connection) unless P.type == Reset
1091          *              Drop packet and return
1092          */
1093         if (dh->dccph_type != DCCP_PKT_RESET) {
1094                 DCCP_SKB_CB(skb)->dccpd_reset_code =
1095                                         DCCP_RESET_CODE_NO_CONNECTION;
1096                 dccp_v6_ctl_send_reset(skb);
1097         }
1098 discard_it:
1099
1100         /*
1101          *      Discard frame
1102          */
1103
1104         kfree_skb(skb);
1105         return 0;
1106
1107 discard_and_relse:
1108         sock_put(sk);
1109         goto discard_it;
1110
1111 do_time_wait:
1112         inet_twsk_put(inet_twsk(sk));
1113         goto no_dccp_socket;
1114 }
1115
1116 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1117         .queue_xmit        = inet6_csk_xmit,
1118         .send_check        = dccp_v6_send_check,
1119         .rebuild_header    = inet6_sk_rebuild_header,
1120         .conn_request      = dccp_v6_conn_request,
1121         .syn_recv_sock     = dccp_v6_request_recv_sock,
1122         .net_header_len    = sizeof(struct ipv6hdr),
1123         .setsockopt        = ipv6_setsockopt,
1124         .getsockopt        = ipv6_getsockopt,
1125         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1126         .sockaddr_len      = sizeof(struct sockaddr_in6),
1127 #ifdef CONFIG_COMPAT
1128         .compat_setsockopt = compat_ipv6_setsockopt,
1129         .compat_getsockopt = compat_ipv6_getsockopt,
1130 #endif
1131 };
1132
1133 /*
1134  *      DCCP over IPv4 via INET6 API
1135  */
1136 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1137         .queue_xmit        = ip_queue_xmit,
1138         .send_check        = dccp_v4_send_check,
1139         .rebuild_header    = inet_sk_rebuild_header,
1140         .conn_request      = dccp_v6_conn_request,
1141         .syn_recv_sock     = dccp_v6_request_recv_sock,
1142         .net_header_len    = sizeof(struct iphdr),
1143         .setsockopt        = ipv6_setsockopt,
1144         .getsockopt        = ipv6_getsockopt,
1145         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1146         .sockaddr_len      = sizeof(struct sockaddr_in6),
1147 #ifdef CONFIG_COMPAT
1148         .compat_setsockopt = compat_ipv6_setsockopt,
1149         .compat_getsockopt = compat_ipv6_getsockopt,
1150 #endif
1151 };
1152
1153 /* NOTE: A lot of things set to zero explicitly by call to
1154  *       sk_alloc() so need not be done here.
1155  */
1156 static int dccp_v6_init_sock(struct sock *sk)
1157 {
1158         static __u8 dccp_v6_ctl_sock_initialized;
1159         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1160
1161         if (err == 0) {
1162                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1163                         dccp_v6_ctl_sock_initialized = 1;
1164                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1165         }
1166
1167         return err;
1168 }
1169
1170 static int dccp_v6_destroy_sock(struct sock *sk)
1171 {
1172         dccp_destroy_sock(sk);
1173         return inet6_destroy_sock(sk);
1174 }
1175
1176 static struct proto dccp_v6_prot = {
1177         .name              = "DCCPv6",
1178         .owner             = THIS_MODULE,
1179         .close             = dccp_close,
1180         .connect           = dccp_v6_connect,
1181         .disconnect        = dccp_disconnect,
1182         .ioctl             = dccp_ioctl,
1183         .init              = dccp_v6_init_sock,
1184         .setsockopt        = dccp_setsockopt,
1185         .getsockopt        = dccp_getsockopt,
1186         .sendmsg           = dccp_sendmsg,
1187         .recvmsg           = dccp_recvmsg,
1188         .backlog_rcv       = dccp_v6_do_rcv,
1189         .hash              = dccp_v6_hash,
1190         .unhash            = dccp_unhash,
1191         .accept            = inet_csk_accept,
1192         .get_port          = dccp_v6_get_port,
1193         .shutdown          = dccp_shutdown,
1194         .destroy           = dccp_v6_destroy_sock,
1195         .orphan_count      = &dccp_orphan_count,
1196         .max_header        = MAX_DCCP_HEADER,
1197         .obj_size          = sizeof(struct dccp6_sock),
1198         .rsk_prot          = &dccp6_request_sock_ops,
1199         .twsk_prot         = &dccp6_timewait_sock_ops,
1200 #ifdef CONFIG_COMPAT
1201         .compat_setsockopt = compat_dccp_setsockopt,
1202         .compat_getsockopt = compat_dccp_getsockopt,
1203 #endif
1204 };
1205
1206 static struct inet6_protocol dccp_v6_protocol = {
1207         .handler        = dccp_v6_rcv,
1208         .err_handler    = dccp_v6_err,
1209         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1210 };
1211
1212 static struct proto_ops inet6_dccp_ops = {
1213         .family            = PF_INET6,
1214         .owner             = THIS_MODULE,
1215         .release           = inet6_release,
1216         .bind              = inet6_bind,
1217         .connect           = inet_stream_connect,
1218         .socketpair        = sock_no_socketpair,
1219         .accept            = inet_accept,
1220         .getname           = inet6_getname,
1221         .poll              = dccp_poll,
1222         .ioctl             = inet6_ioctl,
1223         .listen            = inet_dccp_listen,
1224         .shutdown          = inet_shutdown,
1225         .setsockopt        = sock_common_setsockopt,
1226         .getsockopt        = sock_common_getsockopt,
1227         .sendmsg           = inet_sendmsg,
1228         .recvmsg           = sock_common_recvmsg,
1229         .mmap              = sock_no_mmap,
1230         .sendpage          = sock_no_sendpage,
1231 #ifdef CONFIG_COMPAT
1232         .compat_setsockopt = compat_sock_common_setsockopt,
1233         .compat_getsockopt = compat_sock_common_getsockopt,
1234 #endif
1235 };
1236
1237 static struct inet_protosw dccp_v6_protosw = {
1238         .type           = SOCK_DCCP,
1239         .protocol       = IPPROTO_DCCP,
1240         .prot           = &dccp_v6_prot,
1241         .ops            = &inet6_dccp_ops,
1242         .capability     = -1,
1243         .flags          = INET_PROTOSW_ICSK,
1244 };
1245
1246 static int __init dccp_v6_init(void)
1247 {
1248         int err = proto_register(&dccp_v6_prot, 1);
1249
1250         if (err != 0)
1251                 goto out;
1252
1253         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1254         if (err != 0)
1255                 goto out_unregister_proto;
1256
1257         inet6_register_protosw(&dccp_v6_protosw);
1258
1259         err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1260                                        SOCK_DCCP, IPPROTO_DCCP);
1261         if (err != 0)
1262                 goto out_unregister_protosw;
1263 out:
1264         return err;
1265 out_unregister_protosw:
1266         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1267         inet6_unregister_protosw(&dccp_v6_protosw);
1268 out_unregister_proto:
1269         proto_unregister(&dccp_v6_prot);
1270         goto out;
1271 }
1272
1273 static void __exit dccp_v6_exit(void)
1274 {
1275         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1276         inet6_unregister_protosw(&dccp_v6_protosw);
1277         proto_unregister(&dccp_v6_prot);
1278 }
1279
1280 module_init(dccp_v6_init);
1281 module_exit(dccp_v6_exit);
1282
1283 /*
1284  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1285  * values directly, Also cover the case where the protocol is not specified,
1286  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1287  */
1288 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1289 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1290 MODULE_LICENSE("GPL");
1291 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1292 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");