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   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 struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  40 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  41
  42 static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
  43 {
  44         return inet_csk_get_port(&dccp_hashinfo, sk, snum,
  45                                  inet6_csk_bind_conflict);
  46 }
  47
  48 static void dccp_v6_hash(struct sock *sk)
  49 {
  50         if (sk->sk_state != DCCP_CLOSED) {
  51                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
  52                         dccp_hash(sk);
  53                         return;
  54                 }
  55                 local_bh_disable();
  56                 __inet6_hash(&dccp_hashinfo, sk);
  57                 local_bh_enable();
  58         }
  59 }
  60
  61 /* add pseudo-header to DCCP checksum stored in skb->csum */
  62 static inline u16 dccp_v6_csum_finish(struct sk_buff *skb,
  63                                       struct in6_addr *saddr,
  64                                       struct in6_addr *daddr)
  65 {
  66         return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
  67 }
  68
  69 static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
  70                                       struct sk_buff *skb)
  71 {
  72         struct ipv6_pinfo *np = inet6_sk(sk);
  73         struct dccp_hdr *dh = dccp_hdr(skb);
  74
  75         dccp_csum_outgoing(skb);
  76         dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
  77 }
  78
  79 static inline __u32 secure_dccpv6_sequence_number(__u32 *saddr, __u32 *daddr,
  80                                                   __u16 sport, __u16 dport   )
  81 {
  82         return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
  83 }
  84
  85 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
  86 {
  87         return secure_dccpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
  88                                              skb->nh.ipv6h->saddr.s6_addr32,
  89                                              dccp_hdr(skb)->dccph_dport,
  90                                              dccp_hdr(skb)->dccph_sport     );
  91
  92 }
  93
  94 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
  95                         int type, int code, int offset, __be32 info)
  96 {
  97         struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
  98         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
  99         struct ipv6_pinfo *np;
 100         struct sock *sk;
 101         int err;
 102         __u64 seq;
 103
 104         sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
 105                           &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 106
 107         if (sk == NULL) {
 108                 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
 109                 return;
 110         }
 111
 112         if (sk->sk_state == DCCP_TIME_WAIT) {
 113                 inet_twsk_put(inet_twsk(sk));
 114                 return;
 115         }
 116
 117         bh_lock_sock(sk);
 118         if (sock_owned_by_user(sk))
 119                 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
 120
 121         if (sk->sk_state == DCCP_CLOSED)
 122                 goto out;
 123
 124         np = inet6_sk(sk);
 125
 126         if (type == ICMPV6_PKT_TOOBIG) {
 127                 struct dst_entry *dst = NULL;
 128
 129                 if (sock_owned_by_user(sk))
 130                         goto out;
 131                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 132                         goto out;
 133
 134                 /* icmp should have updated the destination cache entry */
 135                 dst = __sk_dst_check(sk, np->dst_cookie);
 136                 if (dst == NULL) {
 137                         struct inet_sock *inet = inet_sk(sk);
 138                         struct flowi fl;
 139
 140                         /* BUGGG_FUTURE: Again, it is not clear how
 141                            to handle rthdr case. Ignore this complexity
 142                            for now.
 143                          */
 144                         memset(&fl, 0, sizeof(fl));
 145                         fl.proto = IPPROTO_DCCP;
 146                         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 147                         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 148                         fl.oif = sk->sk_bound_dev_if;
 149                         fl.fl_ip_dport = inet->dport;
 150                         fl.fl_ip_sport = inet->sport;
 151                         security_sk_classify_flow(sk, &fl);
 152
 153                         err = ip6_dst_lookup(sk, &dst, &fl);
 154                         if (err) {
 155                                 sk->sk_err_soft = -err;
 156                                 goto out;
 157                         }
 158
 159                         err = xfrm_lookup(&dst, &fl, sk, 0);
 160                         if (err < 0) {
 161                                 sk->sk_err_soft = -err;
 162                                 goto out;
 163                         }
 164                 } else
 165                         dst_hold(dst);
 166
 167                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 168                         dccp_sync_mss(sk, dst_mtu(dst));
 169                 } /* else let the usual retransmit timer handle it */
 170                 dst_release(dst);
 171                 goto out;
 172         }
 173
 174         icmpv6_err_convert(type, code, &err);
 175
 176         seq = DCCP_SKB_CB(skb)->dccpd_seq;
 177         /* Might be for an request_sock */
 178         switch (sk->sk_state) {
 179                 struct request_sock *req, **prev;
 180         case DCCP_LISTEN:
 181                 if (sock_owned_by_user(sk))
 182                         goto out;
 183
 184                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 185                                            &hdr->daddr, &hdr->saddr,
 186                                            inet6_iif(skb));
 187                 if (req == NULL)
 188                         goto out;
 189
 190                 /*
 191                  * ICMPs are not backlogged, hence we cannot get an established
 192                  * socket here.
 193                  */
 194                 BUG_TRAP(req->sk == NULL);
 195
 196                 if (seq != dccp_rsk(req)->dreq_iss) {
 197                         NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
 198                         goto out;
 199                 }
 200
 201                 inet_csk_reqsk_queue_drop(sk, req, prev);
 202                 goto out;
 203
 204         case DCCP_REQUESTING:
 205         case DCCP_RESPOND:  /* Cannot happen.
 206                                It can, it SYNs are crossed. --ANK */
 207                 if (!sock_owned_by_user(sk)) {
 208                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 209                         sk->sk_err = err;
 210                         /*
 211                          * Wake people up to see the error
 212                          * (see connect in sock.c)
 213                          */
 214                         sk->sk_error_report(sk);
 215                         dccp_done(sk);
 216                 } else
 217                         sk->sk_err_soft = err;
 218                 goto out;
 219         }
 220
 221         if (!sock_owned_by_user(sk) && np->recverr) {
 222                 sk->sk_err = err;
 223                 sk->sk_error_report(sk);
 224         } else
 225                 sk->sk_err_soft = err;
 226
 227 out:
 228         bh_unlock_sock(sk);
 229         sock_put(sk);
 230 }
 231
 232
 233 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
 234                                  struct dst_entry *dst)
 235 {
 236         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 237         struct ipv6_pinfo *np = inet6_sk(sk);
 238         struct sk_buff *skb;
 239         struct ipv6_txoptions *opt = NULL;
 240         struct in6_addr *final_p = NULL, final;
 241         struct flowi fl;
 242         int err = -1;
 243
 244         memset(&fl, 0, sizeof(fl));
 245         fl.proto = IPPROTO_DCCP;
 246         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 247         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 248         fl.fl6_flowlabel = 0;
 249         fl.oif = ireq6->iif;
 250         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 251         fl.fl_ip_sport = inet_sk(sk)->sport;
 252         security_req_classify_flow(req, &fl);
 253
 254         if (dst == NULL) {
 255                 opt = np->opt;
 256                 if (opt == NULL &&
 257                     np->rxopt.bits.osrcrt == 2 &&
 258                     ireq6->pktopts) {
 259                         struct sk_buff *pktopts = ireq6->pktopts;
 260                         struct inet6_skb_parm *rxopt = IP6CB(pktopts);
 261
 262                         if (rxopt->srcrt)
 263                                 opt = ipv6_invert_rthdr(sk,
 264                                         (struct ipv6_rt_hdr *)(pktopts->nh.raw +
 265                                                                rxopt->srcrt));
 266                 }
 267
 268                 if (opt != NULL && opt->srcrt != NULL) {
 269                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 270
 271                         ipv6_addr_copy(&final, &fl.fl6_dst);
 272                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 273                         final_p = &final;
 274                 }
 275
 276                 err = ip6_dst_lookup(sk, &dst, &fl);
 277                 if (err)
 278                         goto done;
 279
 280                 if (final_p)
 281                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 282
 283                 err = xfrm_lookup(&dst, &fl, sk, 0);
 284                 if (err < 0)
 285                         goto done;
 286         }
 287
 288         skb = dccp_make_response(sk, dst, req);
 289         if (skb != NULL) {
 290                 struct dccp_hdr *dh = dccp_hdr(skb);
 291
 292                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
 293                                                          &ireq6->loc_addr,
 294                                                          &ireq6->rmt_addr);
 295                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 296                 err = ip6_xmit(sk, skb, &fl, opt, 0);
 297                 err = net_xmit_eval(err);
 298         }
 299
 300 done:
 301         if (opt != NULL && opt != np->opt)
 302                 sock_kfree_s(sk, opt, opt->tot_len);
 303         dst_release(dst);
 304         return err;
 305 }
 306
 307 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 308 {
 309         if (inet6_rsk(req)->pktopts != NULL)
 310                 kfree_skb(inet6_rsk(req)->pktopts);
 311 }
 312
 313 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 314 {
 315         struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
 316         const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
 317                                        sizeof(struct dccp_hdr_ext) +
 318                                        sizeof(struct dccp_hdr_reset);
 319         struct sk_buff *skb;
 320         struct flowi fl;
 321         u64 seqno = 0;
 322
 323         if (rxdh->dccph_type == DCCP_PKT_RESET)
 324                 return;
 325
 326         if (!ipv6_unicast_destination(rxskb))
 327                 return;
 328
 329         skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
 330                         GFP_ATOMIC);
 331         if (skb == NULL)
 332                 return;
 333
 334         skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
 335
 336         dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len);
 337
 338         /* Swap the send and the receive. */
 339         dh->dccph_type  = DCCP_PKT_RESET;
 340         dh->dccph_sport = rxdh->dccph_dport;
 341         dh->dccph_dport = rxdh->dccph_sport;
 342         dh->dccph_doff  = dccp_hdr_reset_len / 4;
 343         dh->dccph_x     = 1;
 344         dccp_hdr_reset(skb)->dccph_reset_code =
 345                                 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
 346
 347         /* See "8.3.1. Abnormal Termination" in RFC 4340 */
 348         if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
 349                 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
 350
 351         dccp_hdr_set_seq(dh, seqno);
 352         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), DCCP_SKB_CB(rxskb)->dccpd_seq);
 353
 354         dccp_csum_outgoing(skb);
 355         dh->dccph_checksum = dccp_v6_csum_finish(skb, &rxskb->nh.ipv6h->saddr,
 356                                                       &rxskb->nh.ipv6h->daddr);
 357
 358         memset(&fl, 0, sizeof(fl));
 359         ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
 360         ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
 361
 362         fl.proto = IPPROTO_DCCP;
 363         fl.oif = inet6_iif(rxskb);
 364         fl.fl_ip_dport = dh->dccph_dport;
 365         fl.fl_ip_sport = dh->dccph_sport;
 366         security_skb_classify_flow(rxskb, &fl);
 367
 368         /* sk = NULL, but it is safe for now. RST socket required. */
 369         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
 370                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 371                         ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
 372                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 373                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 374                         return;
 375                 }
 376         }
 377
 378         kfree_skb(skb);
 379 }
 380
 381 static struct request_sock_ops dccp6_request_sock_ops = {
 382         .family         = AF_INET6,
 383         .obj_size       = sizeof(struct dccp6_request_sock),
 384         .rtx_syn_ack    = dccp_v6_send_response,
 385         .send_ack       = dccp_reqsk_send_ack,
 386         .destructor     = dccp_v6_reqsk_destructor,
 387         .send_reset     = dccp_v6_ctl_send_reset,
 388 };
 389
 390 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 391 {
 392         const struct dccp_hdr *dh = dccp_hdr(skb);
 393         const struct ipv6hdr *iph = skb->nh.ipv6h;
 394         struct sock *nsk;
 395         struct request_sock **prev;
 396         /* Find possible connection requests. */
 397         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 398                                                         dh->dccph_sport,
 399                                                         &iph->saddr,
 400                                                         &iph->daddr,
 401                                                         inet6_iif(skb));
 402         if (req != NULL)
 403                 return dccp_check_req(sk, skb, req, prev);
 404
 405         nsk = __inet6_lookup_established(&dccp_hashinfo,
 406                                          &iph->saddr, dh->dccph_sport,
 407                                          &iph->daddr, ntohs(dh->dccph_dport),
 408                                          inet6_iif(skb));
 409         if (nsk != NULL) {
 410                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 411                         bh_lock_sock(nsk);
 412                         return nsk;
 413                 }
 414                 inet_twsk_put(inet_twsk(nsk));
 415                 return NULL;
 416         }
 417
 418         return sk;
 419 }
 420
 421 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 422 {
 423         struct request_sock *req;
 424         struct dccp_request_sock *dreq;
 425         struct inet6_request_sock *ireq6;
 426         struct ipv6_pinfo *np = inet6_sk(sk);
 427         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 428         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 429         __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
 430
 431         if (skb->protocol == htons(ETH_P_IP))
 432                 return dccp_v4_conn_request(sk, skb);
 433
 434         if (!ipv6_unicast_destination(skb))
 435                 goto drop;
 436
 437         if (dccp_bad_service_code(sk, service)) {
 438                 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 439                 goto drop;
 440         }
 441         /*
 442          * There are no SYN attacks on IPv6, yet...
 443          */
 444         if (inet_csk_reqsk_queue_is_full(sk))
 445                 goto drop;
 446
 447         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 448                 goto drop;
 449
 450         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 451         if (req == NULL)
 452                 goto drop;
 453
 454         if (dccp_parse_options(sk, skb))
 455                 goto drop_and_free;
 456
 457         dccp_reqsk_init(req, skb);
 458
 459         if (security_inet_conn_request(sk, skb, req))
 460                 goto drop_and_free;
 461
 462         ireq6 = inet6_rsk(req);
 463         ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
 464         ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
 465         ireq6->pktopts  = NULL;
 466
 467         if (ipv6_opt_accepted(sk, skb) ||
 468             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 469             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 470                 atomic_inc(&skb->users);
 471                 ireq6->pktopts = skb;
 472         }
 473         ireq6->iif = sk->sk_bound_dev_if;
 474
 475         /* So that link locals have meaning */
 476         if (!sk->sk_bound_dev_if &&
 477             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 478                 ireq6->iif = inet6_iif(skb);
 479
 480         /*
 481          * Step 3: Process LISTEN state
 482          *
 483          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 484          *
 485          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 486          *   dccp_create_openreq_child.
 487          */
 488         dreq = dccp_rsk(req);
 489         dreq->dreq_isr     = dcb->dccpd_seq;
 490         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 491         dreq->dreq_service = service;
 492
 493         if (dccp_v6_send_response(sk, req, NULL))
 494                 goto drop_and_free;
 495
 496         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 497         return 0;
 498
 499 drop_and_free:
 500         reqsk_free(req);
 501 drop:
 502         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 503         dcb->dccpd_reset_code = reset_code;
 504         return -1;
 505 }
 506
 507 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 508                                               struct sk_buff *skb,
 509                                               struct request_sock *req,
 510                                               struct dst_entry *dst)
 511 {
 512         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 513         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 514         struct inet_sock *newinet;
 515         struct dccp_sock *newdp;
 516         struct dccp6_sock *newdp6;
 517         struct sock *newsk;
 518         struct ipv6_txoptions *opt;
 519
 520         if (skb->protocol == htons(ETH_P_IP)) {
 521                 /*
 522                  *      v6 mapped
 523                  */
 524                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 525                 if (newsk == NULL)
 526                         return NULL;
 527
 528                 newdp6 = (struct dccp6_sock *)newsk;
 529                 newdp = dccp_sk(newsk);
 530                 newinet = inet_sk(newsk);
 531                 newinet->pinet6 = &newdp6->inet6;
 532                 newnp = inet6_sk(newsk);
 533
 534                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 535
 536                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 537                               newinet->daddr);
 538
 539                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 540                               newinet->saddr);
 541
 542                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 543
 544                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 545                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 546                 newnp->pktoptions  = NULL;
 547                 newnp->opt         = NULL;
 548                 newnp->mcast_oif   = inet6_iif(skb);
 549                 newnp->mcast_hops  = skb->nh.ipv6h->hop_limit;
 550
 551                 /*
 552                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 553                  * here, dccp_create_openreq_child now does this for us, see the comment in
 554                  * that function for the gory details. -acme
 555                  */
 556
 557                 /* It is tricky place. Until this moment IPv4 tcp
 558                    worked with IPv6 icsk.icsk_af_ops.
 559                    Sync it now.
 560                  */
 561                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 562
 563                 return newsk;
 564         }
 565
 566         opt = np->opt;
 567
 568         if (sk_acceptq_is_full(sk))
 569                 goto out_overflow;
 570
 571         if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) {
 572                 const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
 573
 574                 if (rxopt->srcrt)
 575                         opt = ipv6_invert_rthdr(sk,
 576                                 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
 577                                                        rxopt->srcrt));
 578         }
 579
 580         if (dst == NULL) {
 581                 struct in6_addr *final_p = NULL, final;
 582                 struct flowi fl;
 583
 584                 memset(&fl, 0, sizeof(fl));
 585                 fl.proto = IPPROTO_DCCP;
 586                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 587                 if (opt != NULL && opt->srcrt != NULL) {
 588                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 589
 590                         ipv6_addr_copy(&final, &fl.fl6_dst);
 591                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 592                         final_p = &final;
 593                 }
 594                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 595                 fl.oif = sk->sk_bound_dev_if;
 596                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 597                 fl.fl_ip_sport = inet_sk(sk)->sport;
 598                 security_sk_classify_flow(sk, &fl);
 599
 600                 if (ip6_dst_lookup(sk, &dst, &fl))
 601                         goto out;
 602
 603                 if (final_p)
 604                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 605
 606                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 607                         goto out;
 608         }
 609
 610         newsk = dccp_create_openreq_child(sk, req, skb);
 611         if (newsk == NULL)
 612                 goto out;
 613
 614         /*
 615          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 616          * count here, dccp_create_openreq_child now does this for us, see the
 617          * comment in that function for the gory details. -acme
 618          */
 619
 620         __ip6_dst_store(newsk, dst, NULL, NULL);
 621         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 622                                                       NETIF_F_TSO);
 623         newdp6 = (struct dccp6_sock *)newsk;
 624         newinet = inet_sk(newsk);
 625         newinet->pinet6 = &newdp6->inet6;
 626         newdp = dccp_sk(newsk);
 627         newnp = inet6_sk(newsk);
 628
 629         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 630
 631         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 632         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 633         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 634         newsk->sk_bound_dev_if = ireq6->iif;
 635
 636         /* Now IPv6 options...
 637
 638            First: no IPv4 options.
 639          */
 640         newinet->opt = NULL;
 641
 642         /* Clone RX bits */
 643         newnp->rxopt.all = np->rxopt.all;
 644
 645         /* Clone pktoptions received with SYN */
 646         newnp->pktoptions = NULL;
 647         if (ireq6->pktopts != NULL) {
 648                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 649                 kfree_skb(ireq6->pktopts);
 650                 ireq6->pktopts = NULL;
 651                 if (newnp->pktoptions)
 652                         skb_set_owner_r(newnp->pktoptions, newsk);
 653         }
 654         newnp->opt        = NULL;
 655         newnp->mcast_oif  = inet6_iif(skb);
 656         newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
 657
 658         /*
 659          * Clone native IPv6 options from listening socket (if any)
 660          *
 661          * Yes, keeping reference count would be much more clever, but we make
 662          * one more one thing there: reattach optmem to newsk.
 663          */
 664         if (opt != NULL) {
 665                 newnp->opt = ipv6_dup_options(newsk, opt);
 666                 if (opt != np->opt)
 667                         sock_kfree_s(sk, opt, opt->tot_len);
 668         }
 669
 670         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 671         if (newnp->opt != NULL)
 672                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 673                                                      newnp->opt->opt_flen);
 674
 675         dccp_sync_mss(newsk, dst_mtu(dst));
 676
 677         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 678
 679         __inet6_hash(&dccp_hashinfo, newsk);
 680         inet_inherit_port(&dccp_hashinfo, sk, newsk);
 681
 682         return newsk;
 683
 684 out_overflow:
 685         NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
 686 out:
 687         NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
 688         if (opt != NULL && opt != np->opt)
 689                 sock_kfree_s(sk, opt, opt->tot_len);
 690         dst_release(dst);
 691         return NULL;
 692 }
 693
 694 /* The socket must have it's spinlock held when we get
 695  * here.
 696  *
 697  * We have a potential double-lock case here, so even when
 698  * doing backlog processing we use the BH locking scheme.
 699  * This is because we cannot sleep with the original spinlock
 700  * held.
 701  */
 702 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 703 {
 704         struct ipv6_pinfo *np = inet6_sk(sk);
 705         struct sk_buff *opt_skb = NULL;
 706
 707         /* Imagine: socket is IPv6. IPv4 packet arrives,
 708            goes to IPv4 receive handler and backlogged.
 709            From backlog it always goes here. Kerboom...
 710            Fortunately, dccp_rcv_established and rcv_established
 711            handle them correctly, but it is not case with
 712            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 713          */
 714
 715         if (skb->protocol == htons(ETH_P_IP))
 716                 return dccp_v4_do_rcv(sk, skb);
 717
 718         if (sk_filter(sk, skb))
 719                 goto discard;
 720
 721         /*
 722          * socket locking is here for SMP purposes as backlog rcv is currently
 723          * called with bh processing disabled.
 724          */
 725
 726         /* Do Stevens' IPV6_PKTOPTIONS.
 727
 728            Yes, guys, it is the only place in our code, where we
 729            may make it not affecting IPv4.
 730            The rest of code is protocol independent,
 731            and I do not like idea to uglify IPv4.
 732
 733            Actually, all the idea behind IPV6_PKTOPTIONS
 734            looks not very well thought. For now we latch
 735            options, received in the last packet, enqueued
 736            by tcp. Feel free to propose better solution.
 737                                                --ANK (980728)
 738          */
 739         if (np->rxopt.all)
 740         /*
 741          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 742          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 743          */
 744                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 745
 746         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 747                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 748                         goto reset;
 749                 if (opt_skb) {
 750                         /* XXX This is where we would goto ipv6_pktoptions. */
 751                         __kfree_skb(opt_skb);
 752                 }
 753                 return 0;
 754         }
 755
 756         /*
 757          *  Step 3: Process LISTEN state
 758          *     If S.state == LISTEN,
 759          *       If P.type == Request or P contains a valid Init Cookie option,
 760          *            (* Must scan the packet's options to check for Init
 761          *               Cookies.  Only Init Cookies are processed here,
 762          *               however; other options are processed in Step 8.  This
 763          *               scan need only be performed if the endpoint uses Init
 764          *               Cookies *)
 765          *            (* Generate a new socket and switch to that socket *)
 766          *            Set S := new socket for this port pair
 767          *            S.state = RESPOND
 768          *            Choose S.ISS (initial seqno) or set from Init Cookies
 769          *            Initialize S.GAR := S.ISS
 770          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 771          *            Continue with S.state == RESPOND
 772          *            (* A Response packet will be generated in Step 11 *)
 773          *       Otherwise,
 774          *            Generate Reset(No Connection) unless P.type == Reset
 775          *            Drop packet and return
 776          *
 777          * NOTE: the check for the packet types is done in
 778          *       dccp_rcv_state_process
 779          */
 780         if (sk->sk_state == DCCP_LISTEN) {
 781                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 782
 783                 if (nsk == NULL)
 784                         goto discard;
 785                 /*
 786                  * Queue it on the new socket if the new socket is active,
 787                  * otherwise we just shortcircuit this and continue with
 788                  * the new socket..
 789                  */
 790                 if (nsk != sk) {
 791                         if (dccp_child_process(sk, nsk, skb))
 792                                 goto reset;
 793                         if (opt_skb != NULL)
 794                                 __kfree_skb(opt_skb);
 795                         return 0;
 796                 }
 797         }
 798
 799         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 800                 goto reset;
 801         if (opt_skb) {
 802                 /* XXX This is where we would goto ipv6_pktoptions. */
 803                 __kfree_skb(opt_skb);
 804         }
 805         return 0;
 806
 807 reset:
 808         dccp_v6_ctl_send_reset(sk, skb);
 809 discard:
 810         if (opt_skb != NULL)
 811                 __kfree_skb(opt_skb);
 812         kfree_skb(skb);
 813         return 0;
 814 }
 815
 816 static int dccp_v6_rcv(struct sk_buff **pskb)
 817 {
 818         const struct dccp_hdr *dh;
 819         struct sk_buff *skb = *pskb;
 820         struct sock *sk;
 821         int min_cov;
 822
 823         /* Step 1: Check header basics */
 824
 825         if (dccp_invalid_packet(skb))
 826                 goto discard_it;
 827
 828         /* Step 1: If header checksum is incorrect, drop packet and return. */
 829         if (dccp_v6_csum_finish(skb, &skb->nh.ipv6h->saddr,
 830                                      &skb->nh.ipv6h->daddr)) {
 831                 LIMIT_NETDEBUG(KERN_WARNING
 832                                "%s: dropped packet with invalid checksum\n",
 833                                __FUNCTION__);
 834                 goto discard_it;
 835         }
 836
 837         dh = dccp_hdr(skb);
 838
 839         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(skb);
 840         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 841
 842         if (dccp_packet_without_ack(skb))
 843                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 844         else
 845                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 846
 847         /* Step 2:
 848          *      Look up flow ID in table and get corresponding socket */
 849         sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
 850                             dh->dccph_sport,
 851                             &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
 852                             inet6_iif(skb));
 853         /*
 854          * Step 2:
 855          *      If no socket ...
 856          */
 857         if (sk == NULL) {
 858                 dccp_pr_debug("failed to look up flow ID in table and "
 859                               "get corresponding socket\n");
 860                 goto no_dccp_socket;
 861         }
 862
 863         /*
 864          * Step 2:
 865          *      ... or S.state == TIMEWAIT,
 866          *              Generate Reset(No Connection) unless P.type == Reset
 867          *              Drop packet and return
 868          */
 869         if (sk->sk_state == DCCP_TIME_WAIT) {
 870                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 871                 inet_twsk_put(inet_twsk(sk));
 872                 goto no_dccp_socket;
 873         }
 874
 875         /*
 876          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 877          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 878          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 879          */
 880         min_cov = dccp_sk(sk)->dccps_pcrlen;
 881         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 882                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 883                               dh->dccph_cscov, min_cov);
 884                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 885                 goto discard_and_relse;
 886         }
 887
 888         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 889                 goto discard_and_relse;
 890
 891         return sk_receive_skb(sk, skb) ? -1 : 0;
 892
 893 no_dccp_socket:
 894         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 895                 goto discard_it;
 896         /*
 897          * Step 2:
 898          *      If no socket ...
 899          *              Generate Reset(No Connection) unless P.type == Reset
 900          *              Drop packet and return
 901          */
 902         if (dh->dccph_type != DCCP_PKT_RESET) {
 903                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 904                                         DCCP_RESET_CODE_NO_CONNECTION;
 905                 dccp_v6_ctl_send_reset(sk, skb);
 906         }
 907
 908 discard_it:
 909         kfree_skb(skb);
 910         return 0;
 911
 912 discard_and_relse:
 913         sock_put(sk);
 914         goto discard_it;
 915 }
 916
 917 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 918                            int addr_len)
 919 {
 920         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 921         struct inet_connection_sock *icsk = inet_csk(sk);
 922         struct inet_sock *inet = inet_sk(sk);
 923         struct ipv6_pinfo *np = inet6_sk(sk);
 924         struct dccp_sock *dp = dccp_sk(sk);
 925         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 926         struct flowi fl;
 927         struct dst_entry *dst;
 928         int addr_type;
 929         int err;
 930
 931         dp->dccps_role = DCCP_ROLE_CLIENT;
 932
 933         if (addr_len < SIN6_LEN_RFC2133)
 934                 return -EINVAL;
 935
 936         if (usin->sin6_family != AF_INET6)
 937                 return -EAFNOSUPPORT;
 938
 939         memset(&fl, 0, sizeof(fl));
 940
 941         if (np->sndflow) {
 942                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 943                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 944                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 945                         struct ip6_flowlabel *flowlabel;
 946                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 947                         if (flowlabel == NULL)
 948                                 return -EINVAL;
 949                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 950                         fl6_sock_release(flowlabel);
 951                 }
 952         }
 953         /*
 954          * connect() to INADDR_ANY means loopback (BSD'ism).
 955          */
 956         if (ipv6_addr_any(&usin->sin6_addr))
 957                 usin->sin6_addr.s6_addr[15] = 1;
 958
 959         addr_type = ipv6_addr_type(&usin->sin6_addr);
 960
 961         if (addr_type & IPV6_ADDR_MULTICAST)
 962                 return -ENETUNREACH;
 963
 964         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 965                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 966                     usin->sin6_scope_id) {
 967                         /* If interface is set while binding, indices
 968                          * must coincide.
 969                          */
 970                         if (sk->sk_bound_dev_if &&
 971                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 972                                 return -EINVAL;
 973
 974                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 975                 }
 976
 977                 /* Connect to link-local address requires an interface */
 978                 if (!sk->sk_bound_dev_if)
 979                         return -EINVAL;
 980         }
 981
 982         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 983         np->flow_label = fl.fl6_flowlabel;
 984
 985         /*
 986          * DCCP over IPv4
 987          */
 988         if (addr_type == IPV6_ADDR_MAPPED) {
 989                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 990                 struct sockaddr_in sin;
 991
 992                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 993
 994                 if (__ipv6_only_sock(sk))
 995                         return -ENETUNREACH;
 996
 997                 sin.sin_family = AF_INET;
 998                 sin.sin_port = usin->sin6_port;
 999                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
1000
1001                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
1002                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
1003
1004                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
1005                 if (err) {
1006                         icsk->icsk_ext_hdr_len = exthdrlen;
1007                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
1008                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
1009                         goto failure;
1010                 } else {
1011                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
1012                                       inet->saddr);
1013                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
1014                                       inet->rcv_saddr);
1015                 }
1016
1017                 return err;
1018         }
1019
1020         if (!ipv6_addr_any(&np->rcv_saddr))
1021                 saddr = &np->rcv_saddr;
1022
1023         fl.proto = IPPROTO_DCCP;
1024         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
1025         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
1026         fl.oif = sk->sk_bound_dev_if;
1027         fl.fl_ip_dport = usin->sin6_port;
1028         fl.fl_ip_sport = inet->sport;
1029         security_sk_classify_flow(sk, &fl);
1030
1031         if (np->opt != NULL && np->opt->srcrt != NULL) {
1032                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
1033
1034                 ipv6_addr_copy(&final, &fl.fl6_dst);
1035                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1036                 final_p = &final;
1037         }
1038
1039         err = ip6_dst_lookup(sk, &dst, &fl);
1040         if (err)
1041                 goto failure;
1042
1043         if (final_p)
1044                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1045
1046         err = xfrm_lookup(&dst, &fl, sk, 0);
1047         if (err < 0)
1048                 goto failure;
1049
1050         if (saddr == NULL) {
1051                 saddr = &fl.fl6_src;
1052                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1053         }
1054
1055         /* set the source address */
1056         ipv6_addr_copy(&np->saddr, saddr);
1057         inet->rcv_saddr = LOOPBACK4_IPV6;
1058
1059         __ip6_dst_store(sk, dst, NULL, NULL);
1060
1061         icsk->icsk_ext_hdr_len = 0;
1062         if (np->opt != NULL)
1063                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1064                                           np->opt->opt_nflen);
1065
1066         inet->dport = usin->sin6_port;
1067
1068         dccp_set_state(sk, DCCP_REQUESTING);
1069         err = inet6_hash_connect(&dccp_death_row, sk);
1070         if (err)
1071                 goto late_failure;
1072
1073         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1074                                                       np->daddr.s6_addr32,
1075                                                       inet->sport, inet->dport);
1076         err = dccp_connect(sk);
1077         if (err)
1078                 goto late_failure;
1079
1080         return 0;
1081
1082 late_failure:
1083         dccp_set_state(sk, DCCP_CLOSED);
1084         __sk_dst_reset(sk);
1085 failure:
1086         inet->dport = 0;
1087         sk->sk_route_caps = 0;
1088         return err;
1089 }
1090
1091 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1092         .queue_xmit        = inet6_csk_xmit,
1093         .send_check        = dccp_v6_send_check,
1094         .rebuild_header    = inet6_sk_rebuild_header,
1095         .conn_request      = dccp_v6_conn_request,
1096         .syn_recv_sock     = dccp_v6_request_recv_sock,
1097         .net_header_len    = sizeof(struct ipv6hdr),
1098         .setsockopt        = ipv6_setsockopt,
1099         .getsockopt        = ipv6_getsockopt,
1100         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1101         .sockaddr_len      = sizeof(struct sockaddr_in6),
1102 #ifdef CONFIG_COMPAT
1103         .compat_setsockopt = compat_ipv6_setsockopt,
1104         .compat_getsockopt = compat_ipv6_getsockopt,
1105 #endif
1106 };
1107
1108 /*
1109  *      DCCP over IPv4 via INET6 API
1110  */
1111 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1112         .queue_xmit        = ip_queue_xmit,
1113         .send_check        = dccp_v4_send_check,
1114         .rebuild_header    = inet_sk_rebuild_header,
1115         .conn_request      = dccp_v6_conn_request,
1116         .syn_recv_sock     = dccp_v6_request_recv_sock,
1117         .net_header_len    = sizeof(struct iphdr),
1118         .setsockopt        = ipv6_setsockopt,
1119         .getsockopt        = ipv6_getsockopt,
1120         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1121         .sockaddr_len      = sizeof(struct sockaddr_in6),
1122 #ifdef CONFIG_COMPAT
1123         .compat_setsockopt = compat_ipv6_setsockopt,
1124         .compat_getsockopt = compat_ipv6_getsockopt,
1125 #endif
1126 };
1127
1128 /* NOTE: A lot of things set to zero explicitly by call to
1129  *       sk_alloc() so need not be done here.
1130  */
1131 static int dccp_v6_init_sock(struct sock *sk)
1132 {
1133         static __u8 dccp_v6_ctl_sock_initialized;
1134         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1135
1136         if (err == 0) {
1137                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1138                         dccp_v6_ctl_sock_initialized = 1;
1139                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1140         }
1141
1142         return err;
1143 }
1144
1145 static int dccp_v6_destroy_sock(struct sock *sk)
1146 {
1147         dccp_destroy_sock(sk);
1148         return inet6_destroy_sock(sk);
1149 }
1150
1151 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1152         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1153 };
1154
1155 static struct proto dccp_v6_prot = {
1156         .name              = "DCCPv6",
1157         .owner             = THIS_MODULE,
1158         .close             = dccp_close,
1159         .connect           = dccp_v6_connect,
1160         .disconnect        = dccp_disconnect,
1161         .ioctl             = dccp_ioctl,
1162         .init              = dccp_v6_init_sock,
1163         .setsockopt        = dccp_setsockopt,
1164         .getsockopt        = dccp_getsockopt,
1165         .sendmsg           = dccp_sendmsg,
1166         .recvmsg           = dccp_recvmsg,
1167         .backlog_rcv       = dccp_v6_do_rcv,
1168         .hash              = dccp_v6_hash,
1169         .unhash            = dccp_unhash,
1170         .accept            = inet_csk_accept,
1171         .get_port          = dccp_v6_get_port,
1172         .shutdown          = dccp_shutdown,
1173         .destroy           = dccp_v6_destroy_sock,
1174         .orphan_count      = &dccp_orphan_count,
1175         .max_header        = MAX_DCCP_HEADER,
1176         .obj_size          = sizeof(struct dccp6_sock),
1177         .rsk_prot          = &dccp6_request_sock_ops,
1178         .twsk_prot         = &dccp6_timewait_sock_ops,
1179 #ifdef CONFIG_COMPAT
1180         .compat_setsockopt = compat_dccp_setsockopt,
1181         .compat_getsockopt = compat_dccp_getsockopt,
1182 #endif
1183 };
1184
1185 static struct inet6_protocol dccp_v6_protocol = {
1186         .handler        = dccp_v6_rcv,
1187         .err_handler    = dccp_v6_err,
1188         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1189 };
1190
1191 static struct proto_ops inet6_dccp_ops = {
1192         .family            = PF_INET6,
1193         .owner             = THIS_MODULE,
1194         .release           = inet6_release,
1195         .bind              = inet6_bind,
1196         .connect           = inet_stream_connect,
1197         .socketpair        = sock_no_socketpair,
1198         .accept            = inet_accept,
1199         .getname           = inet6_getname,
1200         .poll              = dccp_poll,
1201         .ioctl             = inet6_ioctl,
1202         .listen            = inet_dccp_listen,
1203         .shutdown          = inet_shutdown,
1204         .setsockopt        = sock_common_setsockopt,
1205         .getsockopt        = sock_common_getsockopt,
1206         .sendmsg           = inet_sendmsg,
1207         .recvmsg           = sock_common_recvmsg,
1208         .mmap              = sock_no_mmap,
1209         .sendpage          = sock_no_sendpage,
1210 #ifdef CONFIG_COMPAT
1211         .compat_setsockopt = compat_sock_common_setsockopt,
1212         .compat_getsockopt = compat_sock_common_getsockopt,
1213 #endif
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
1238         err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1239                                        SOCK_DCCP, IPPROTO_DCCP);
1240         if (err != 0)
1241                 goto out_unregister_protosw;
1242 out:
1243         return err;
1244 out_unregister_protosw:
1245         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1246         inet6_unregister_protosw(&dccp_v6_protosw);
1247 out_unregister_proto:
1248         proto_unregister(&dccp_v6_prot);
1249         goto out;
1250 }
1251
1252 static void __exit dccp_v6_exit(void)
1253 {
1254         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1255         inet6_unregister_protosw(&dccp_v6_protosw);
1256         proto_unregister(&dccp_v6_prot);
1257 }
1258
1259 module_init(dccp_v6_init);
1260 module_exit(dccp_v6_exit);
1261
1262 /*
1263  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1264  * values directly, Also cover the case where the protocol is not specified,
1265  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1266  */
1267 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1268 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1269 MODULE_LICENSE("GPL");
1270 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1271 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");