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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                 if (err == NET_XMIT_CN)
 298                         err = 0;
 299         }
 300
 301 done:
 302         if (opt != NULL && opt != np->opt)
 303                 sock_kfree_s(sk, opt, opt->tot_len);
 304         dst_release(dst);
 305         return err;
 306 }
 307
 308 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 309 {
 310         if (inet6_rsk(req)->pktopts != NULL)
 311                 kfree_skb(inet6_rsk(req)->pktopts);
 312 }
 313
 314 static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
 315 {
 316         struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
 317         const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
 318                                        sizeof(struct dccp_hdr_ext) +
 319                                        sizeof(struct dccp_hdr_reset);
 320         struct sk_buff *skb;
 321         struct flowi fl;
 322         u64 seqno;
 323
 324         if (rxdh->dccph_type == DCCP_PKT_RESET)
 325                 return;
 326
 327         if (!ipv6_unicast_destination(rxskb))
 328                 return;
 329
 330         skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
 331                         GFP_ATOMIC);
 332         if (skb == NULL)
 333                 return;
 334
 335         skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
 336
 337         dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len);
 338
 339         /* Swap the send and the receive. */
 340         dh->dccph_type  = DCCP_PKT_RESET;
 341         dh->dccph_sport = rxdh->dccph_dport;
 342         dh->dccph_dport = rxdh->dccph_sport;
 343         dh->dccph_doff  = dccp_hdr_reset_len / 4;
 344         dh->dccph_x     = 1;
 345         dccp_hdr_reset(skb)->dccph_reset_code =
 346                                 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
 347
 348         /* See "8.3.1. Abnormal Termination" in RFC 4340 */
 349         seqno = 0;
 350         if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
 351                 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
 352
 353         dccp_hdr_set_seq(dh, seqno);
 354         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
 355                          DCCP_SKB_CB(rxskb)->dccpd_seq);
 356
 357         dccp_csum_outgoing(skb);
 358         dh->dccph_checksum = dccp_v6_csum_finish(skb, &rxskb->nh.ipv6h->saddr,
 359                                                       &rxskb->nh.ipv6h->daddr);
 360
 361         memset(&fl, 0, sizeof(fl));
 362         ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
 363         ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
 364
 365         fl.proto = IPPROTO_DCCP;
 366         fl.oif = inet6_iif(rxskb);
 367         fl.fl_ip_dport = dh->dccph_dport;
 368         fl.fl_ip_sport = dh->dccph_sport;
 369         security_skb_classify_flow(rxskb, &fl);
 370
 371         /* sk = NULL, but it is safe for now. RST socket required. */
 372         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
 373                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 374                         ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
 375                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 376                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 377                         return;
 378                 }
 379         }
 380
 381         kfree_skb(skb);
 382 }
 383
 384 static struct request_sock_ops dccp6_request_sock_ops = {
 385         .family         = AF_INET6,
 386         .obj_size       = sizeof(struct dccp6_request_sock),
 387         .rtx_syn_ack    = dccp_v6_send_response,
 388         .send_ack       = dccp_reqsk_send_ack,
 389         .destructor     = dccp_v6_reqsk_destructor,
 390         .send_reset     = dccp_v6_ctl_send_reset,
 391 };
 392
 393 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 394 {
 395         const struct dccp_hdr *dh = dccp_hdr(skb);
 396         const struct ipv6hdr *iph = skb->nh.ipv6h;
 397         struct sock *nsk;
 398         struct request_sock **prev;
 399         /* Find possible connection requests. */
 400         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 401                                                         dh->dccph_sport,
 402                                                         &iph->saddr,
 403                                                         &iph->daddr,
 404                                                         inet6_iif(skb));
 405         if (req != NULL)
 406                 return dccp_check_req(sk, skb, req, prev);
 407
 408         nsk = __inet6_lookup_established(&dccp_hashinfo,
 409                                          &iph->saddr, dh->dccph_sport,
 410                                          &iph->daddr, ntohs(dh->dccph_dport),
 411                                          inet6_iif(skb));
 412         if (nsk != NULL) {
 413                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 414                         bh_lock_sock(nsk);
 415                         return nsk;
 416                 }
 417                 inet_twsk_put(inet_twsk(nsk));
 418                 return NULL;
 419         }
 420
 421         return sk;
 422 }
 423
 424 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 425 {
 426         struct request_sock *req;
 427         struct dccp_request_sock *dreq;
 428         struct inet6_request_sock *ireq6;
 429         struct ipv6_pinfo *np = inet6_sk(sk);
 430         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 431         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 432         __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
 433
 434         if (skb->protocol == htons(ETH_P_IP))
 435                 return dccp_v4_conn_request(sk, skb);
 436
 437         if (!ipv6_unicast_destination(skb))
 438                 goto drop;
 439
 440         if (dccp_bad_service_code(sk, service)) {
 441                 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 442                 goto drop;
 443         }
 444         /*
 445          * There are no SYN attacks on IPv6, yet...
 446          */
 447         if (inet_csk_reqsk_queue_is_full(sk))
 448                 goto drop;
 449
 450         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 451                 goto drop;
 452
 453         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 454         if (req == NULL)
 455                 goto drop;
 456
 457         if (dccp_parse_options(sk, skb))
 458                 goto drop_and_free;
 459
 460         dccp_reqsk_init(req, skb);
 461
 462         if (security_inet_conn_request(sk, skb, req))
 463                 goto drop_and_free;
 464
 465         ireq6 = inet6_rsk(req);
 466         ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
 467         ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
 468         ireq6->pktopts  = NULL;
 469
 470         if (ipv6_opt_accepted(sk, skb) ||
 471             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 472             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 473                 atomic_inc(&skb->users);
 474                 ireq6->pktopts = skb;
 475         }
 476         ireq6->iif = sk->sk_bound_dev_if;
 477
 478         /* So that link locals have meaning */
 479         if (!sk->sk_bound_dev_if &&
 480             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 481                 ireq6->iif = inet6_iif(skb);
 482
 483         /*
 484          * Step 3: Process LISTEN state
 485          *
 486          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 487          *
 488          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 489          *   dccp_create_openreq_child.
 490          */
 491         dreq = dccp_rsk(req);
 492         dreq->dreq_isr     = dcb->dccpd_seq;
 493         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 494         dreq->dreq_service = service;
 495
 496         if (dccp_v6_send_response(sk, req, NULL))
 497                 goto drop_and_free;
 498
 499         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 500         return 0;
 501
 502 drop_and_free:
 503         reqsk_free(req);
 504 drop:
 505         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 506         dcb->dccpd_reset_code = reset_code;
 507         return -1;
 508 }
 509
 510 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 511                                               struct sk_buff *skb,
 512                                               struct request_sock *req,
 513                                               struct dst_entry *dst)
 514 {
 515         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 516         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 517         struct inet_sock *newinet;
 518         struct dccp_sock *newdp;
 519         struct dccp6_sock *newdp6;
 520         struct sock *newsk;
 521         struct ipv6_txoptions *opt;
 522
 523         if (skb->protocol == htons(ETH_P_IP)) {
 524                 /*
 525                  *      v6 mapped
 526                  */
 527                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 528                 if (newsk == NULL)
 529                         return NULL;
 530
 531                 newdp6 = (struct dccp6_sock *)newsk;
 532                 newdp = dccp_sk(newsk);
 533                 newinet = inet_sk(newsk);
 534                 newinet->pinet6 = &newdp6->inet6;
 535                 newnp = inet6_sk(newsk);
 536
 537                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 538
 539                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 540                               newinet->daddr);
 541
 542                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 543                               newinet->saddr);
 544
 545                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 546
 547                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 548                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 549                 newnp->pktoptions  = NULL;
 550                 newnp->opt         = NULL;
 551                 newnp->mcast_oif   = inet6_iif(skb);
 552                 newnp->mcast_hops  = skb->nh.ipv6h->hop_limit;
 553
 554                 /*
 555                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 556                  * here, dccp_create_openreq_child now does this for us, see the comment in
 557                  * that function for the gory details. -acme
 558                  */
 559
 560                 /* It is tricky place. Until this moment IPv4 tcp
 561                    worked with IPv6 icsk.icsk_af_ops.
 562                    Sync it now.
 563                  */
 564                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 565
 566                 return newsk;
 567         }
 568
 569         opt = np->opt;
 570
 571         if (sk_acceptq_is_full(sk))
 572                 goto out_overflow;
 573
 574         if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) {
 575                 const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
 576
 577                 if (rxopt->srcrt)
 578                         opt = ipv6_invert_rthdr(sk,
 579                                 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
 580                                                        rxopt->srcrt));
 581         }
 582
 583         if (dst == NULL) {
 584                 struct in6_addr *final_p = NULL, final;
 585                 struct flowi fl;
 586
 587                 memset(&fl, 0, sizeof(fl));
 588                 fl.proto = IPPROTO_DCCP;
 589                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 590                 if (opt != NULL && opt->srcrt != NULL) {
 591                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 592
 593                         ipv6_addr_copy(&final, &fl.fl6_dst);
 594                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 595                         final_p = &final;
 596                 }
 597                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 598                 fl.oif = sk->sk_bound_dev_if;
 599                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 600                 fl.fl_ip_sport = inet_sk(sk)->sport;
 601                 security_sk_classify_flow(sk, &fl);
 602
 603                 if (ip6_dst_lookup(sk, &dst, &fl))
 604                         goto out;
 605
 606                 if (final_p)
 607                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 608
 609                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 610                         goto out;
 611         }
 612
 613         newsk = dccp_create_openreq_child(sk, req, skb);
 614         if (newsk == NULL)
 615                 goto out;
 616
 617         /*
 618          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 619          * count here, dccp_create_openreq_child now does this for us, see the
 620          * comment in that function for the gory details. -acme
 621          */
 622
 623         __ip6_dst_store(newsk, dst, NULL, NULL);
 624         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 625                                                       NETIF_F_TSO);
 626         newdp6 = (struct dccp6_sock *)newsk;
 627         newinet = inet_sk(newsk);
 628         newinet->pinet6 = &newdp6->inet6;
 629         newdp = dccp_sk(newsk);
 630         newnp = inet6_sk(newsk);
 631
 632         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 633
 634         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 635         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 636         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 637         newsk->sk_bound_dev_if = ireq6->iif;
 638
 639         /* Now IPv6 options...
 640
 641            First: no IPv4 options.
 642          */
 643         newinet->opt = NULL;
 644
 645         /* Clone RX bits */
 646         newnp->rxopt.all = np->rxopt.all;
 647
 648         /* Clone pktoptions received with SYN */
 649         newnp->pktoptions = NULL;
 650         if (ireq6->pktopts != NULL) {
 651                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 652                 kfree_skb(ireq6->pktopts);
 653                 ireq6->pktopts = NULL;
 654                 if (newnp->pktoptions)
 655                         skb_set_owner_r(newnp->pktoptions, newsk);
 656         }
 657         newnp->opt        = NULL;
 658         newnp->mcast_oif  = inet6_iif(skb);
 659         newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
 660
 661         /*
 662          * Clone native IPv6 options from listening socket (if any)
 663          *
 664          * Yes, keeping reference count would be much more clever, but we make
 665          * one more one thing there: reattach optmem to newsk.
 666          */
 667         if (opt != NULL) {
 668                 newnp->opt = ipv6_dup_options(newsk, opt);
 669                 if (opt != np->opt)
 670                         sock_kfree_s(sk, opt, opt->tot_len);
 671         }
 672
 673         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 674         if (newnp->opt != NULL)
 675                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 676                                                      newnp->opt->opt_flen);
 677
 678         dccp_sync_mss(newsk, dst_mtu(dst));
 679
 680         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 681
 682         __inet6_hash(&dccp_hashinfo, newsk);
 683         inet_inherit_port(&dccp_hashinfo, sk, newsk);
 684
 685         return newsk;
 686
 687 out_overflow:
 688         NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
 689 out:
 690         NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
 691         if (opt != NULL && opt != np->opt)
 692                 sock_kfree_s(sk, opt, opt->tot_len);
 693         dst_release(dst);
 694         return NULL;
 695 }
 696
 697 /* The socket must have it's spinlock held when we get
 698  * here.
 699  *
 700  * We have a potential double-lock case here, so even when
 701  * doing backlog processing we use the BH locking scheme.
 702  * This is because we cannot sleep with the original spinlock
 703  * held.
 704  */
 705 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 706 {
 707         struct ipv6_pinfo *np = inet6_sk(sk);
 708         struct sk_buff *opt_skb = NULL;
 709
 710         /* Imagine: socket is IPv6. IPv4 packet arrives,
 711            goes to IPv4 receive handler and backlogged.
 712            From backlog it always goes here. Kerboom...
 713            Fortunately, dccp_rcv_established and rcv_established
 714            handle them correctly, but it is not case with
 715            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 716          */
 717
 718         if (skb->protocol == htons(ETH_P_IP))
 719                 return dccp_v4_do_rcv(sk, skb);
 720
 721         if (sk_filter(sk, skb))
 722                 goto discard;
 723
 724         /*
 725          * socket locking is here for SMP purposes as backlog rcv is currently
 726          * called with bh processing disabled.
 727          */
 728
 729         /* Do Stevens' IPV6_PKTOPTIONS.
 730
 731            Yes, guys, it is the only place in our code, where we
 732            may make it not affecting IPv4.
 733            The rest of code is protocol independent,
 734            and I do not like idea to uglify IPv4.
 735
 736            Actually, all the idea behind IPV6_PKTOPTIONS
 737            looks not very well thought. For now we latch
 738            options, received in the last packet, enqueued
 739            by tcp. Feel free to propose better solution.
 740                                                --ANK (980728)
 741          */
 742         if (np->rxopt.all)
 743         /*
 744          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 745          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 746          */
 747                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 748
 749         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 750                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 751                         goto reset;
 752                 if (opt_skb) {
 753                         /* XXX This is where we would goto ipv6_pktoptions. */
 754                         __kfree_skb(opt_skb);
 755                 }
 756                 return 0;
 757         }
 758
 759         /*
 760          *  Step 3: Process LISTEN state
 761          *     If S.state == LISTEN,
 762          *       If P.type == Request or P contains a valid Init Cookie option,
 763          *            (* Must scan the packet's options to check for Init
 764          *               Cookies.  Only Init Cookies are processed here,
 765          *               however; other options are processed in Step 8.  This
 766          *               scan need only be performed if the endpoint uses Init
 767          *               Cookies *)
 768          *            (* Generate a new socket and switch to that socket *)
 769          *            Set S := new socket for this port pair
 770          *            S.state = RESPOND
 771          *            Choose S.ISS (initial seqno) or set from Init Cookies
 772          *            Initialize S.GAR := S.ISS
 773          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 774          *            Continue with S.state == RESPOND
 775          *            (* A Response packet will be generated in Step 11 *)
 776          *       Otherwise,
 777          *            Generate Reset(No Connection) unless P.type == Reset
 778          *            Drop packet and return
 779          *
 780          * NOTE: the check for the packet types is done in
 781          *       dccp_rcv_state_process
 782          */
 783         if (sk->sk_state == DCCP_LISTEN) {
 784                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 785
 786                 if (nsk == NULL)
 787                         goto discard;
 788                 /*
 789                  * Queue it on the new socket if the new socket is active,
 790                  * otherwise we just shortcircuit this and continue with
 791                  * the new socket..
 792                  */
 793                 if (nsk != sk) {
 794                         if (dccp_child_process(sk, nsk, skb))
 795                                 goto reset;
 796                         if (opt_skb != NULL)
 797                                 __kfree_skb(opt_skb);
 798                         return 0;
 799                 }
 800         }
 801
 802         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 803                 goto reset;
 804         if (opt_skb) {
 805                 /* XXX This is where we would goto ipv6_pktoptions. */
 806                 __kfree_skb(opt_skb);
 807         }
 808         return 0;
 809
 810 reset:
 811         dccp_v6_ctl_send_reset(skb);
 812 discard:
 813         if (opt_skb != NULL)
 814                 __kfree_skb(opt_skb);
 815         kfree_skb(skb);
 816         return 0;
 817 }
 818
 819 static int dccp_v6_rcv(struct sk_buff **pskb)
 820 {
 821         const struct dccp_hdr *dh;
 822         struct sk_buff *skb = *pskb;
 823         struct sock *sk;
 824         int min_cov;
 825
 826         /* Step 1: Check header basics */
 827
 828         if (dccp_invalid_packet(skb))
 829                 goto discard_it;
 830
 831         /* Step 1: If header checksum is incorrect, drop packet and return. */
 832         if (dccp_v6_csum_finish(skb, &skb->nh.ipv6h->saddr,
 833                                      &skb->nh.ipv6h->daddr)) {
 834                 LIMIT_NETDEBUG(KERN_WARNING
 835                                "%s: dropped packet with invalid checksum\n",
 836                                __FUNCTION__);
 837                 goto discard_it;
 838         }
 839
 840         dh = dccp_hdr(skb);
 841
 842         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(skb);
 843         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 844
 845         if (dccp_packet_without_ack(skb))
 846                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 847         else
 848                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 849
 850         /* Step 2:
 851          *      Look up flow ID in table and get corresponding socket */
 852         sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
 853                             dh->dccph_sport,
 854                             &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
 855                             inet6_iif(skb));
 856         /*
 857          * Step 2:
 858          *      If no socket ...
 859          */
 860         if (sk == NULL) {
 861                 dccp_pr_debug("failed to look up flow ID in table and "
 862                               "get corresponding socket\n");
 863                 goto no_dccp_socket;
 864         }
 865
 866         /*
 867          * Step 2:
 868          *      ... or S.state == TIMEWAIT,
 869          *              Generate Reset(No Connection) unless P.type == Reset
 870          *              Drop packet and return
 871          */
 872         if (sk->sk_state == DCCP_TIME_WAIT) {
 873                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 874                 inet_twsk_put(inet_twsk(sk));
 875                 goto no_dccp_socket;
 876         }
 877
 878         /*
 879          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 880          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 881          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 882          */
 883         min_cov = dccp_sk(sk)->dccps_pcrlen;
 884         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 885                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 886                               dh->dccph_cscov, min_cov);
 887                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 888                 goto discard_and_relse;
 889         }
 890
 891         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 892                 goto discard_and_relse;
 893
 894         return sk_receive_skb(sk, skb) ? -1 : 0;
 895
 896 no_dccp_socket:
 897         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 898                 goto discard_it;
 899         /*
 900          * Step 2:
 901          *      If no socket ...
 902          *              Generate Reset(No Connection) unless P.type == Reset
 903          *              Drop packet and return
 904          */
 905         if (dh->dccph_type != DCCP_PKT_RESET) {
 906                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 907                                         DCCP_RESET_CODE_NO_CONNECTION;
 908                 dccp_v6_ctl_send_reset(skb);
 909         }
 910
 911 discard_it:
 912         kfree_skb(skb);
 913         return 0;
 914
 915 discard_and_relse:
 916         sock_put(sk);
 917         goto discard_it;
 918 }
 919
 920 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 921                            int addr_len)
 922 {
 923         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 924         struct inet_connection_sock *icsk = inet_csk(sk);
 925         struct inet_sock *inet = inet_sk(sk);
 926         struct ipv6_pinfo *np = inet6_sk(sk);
 927         struct dccp_sock *dp = dccp_sk(sk);
 928         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 929         struct flowi fl;
 930         struct dst_entry *dst;
 931         int addr_type;
 932         int err;
 933
 934         dp->dccps_role = DCCP_ROLE_CLIENT;
 935
 936         if (addr_len < SIN6_LEN_RFC2133)
 937                 return -EINVAL;
 938
 939         if (usin->sin6_family != AF_INET6)
 940                 return -EAFNOSUPPORT;
 941
 942         memset(&fl, 0, sizeof(fl));
 943
 944         if (np->sndflow) {
 945                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 946                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 947                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 948                         struct ip6_flowlabel *flowlabel;
 949                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 950                         if (flowlabel == NULL)
 951                                 return -EINVAL;
 952                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 953                         fl6_sock_release(flowlabel);
 954                 }
 955         }
 956         /*
 957          * connect() to INADDR_ANY means loopback (BSD'ism).
 958          */
 959         if (ipv6_addr_any(&usin->sin6_addr))
 960                 usin->sin6_addr.s6_addr[15] = 1;
 961
 962         addr_type = ipv6_addr_type(&usin->sin6_addr);
 963
 964         if (addr_type & IPV6_ADDR_MULTICAST)
 965                 return -ENETUNREACH;
 966
 967         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 968                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 969                     usin->sin6_scope_id) {
 970                         /* If interface is set while binding, indices
 971                          * must coincide.
 972                          */
 973                         if (sk->sk_bound_dev_if &&
 974                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 975                                 return -EINVAL;
 976
 977                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 978                 }
 979
 980                 /* Connect to link-local address requires an interface */
 981                 if (!sk->sk_bound_dev_if)
 982                         return -EINVAL;
 983         }
 984
 985         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 986         np->flow_label = fl.fl6_flowlabel;
 987
 988         /*
 989          * DCCP over IPv4
 990          */
 991         if (addr_type == IPV6_ADDR_MAPPED) {
 992                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 993                 struct sockaddr_in sin;
 994
 995                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 996
 997                 if (__ipv6_only_sock(sk))
 998                         return -ENETUNREACH;
 999
1000                 sin.sin_family = AF_INET;
1001                 sin.sin_port = usin->sin6_port;
1002                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
1003
1004                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
1005                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
1006
1007                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
1008                 if (err) {
1009                         icsk->icsk_ext_hdr_len = exthdrlen;
1010                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
1011                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
1012                         goto failure;
1013                 } else {
1014                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
1015                                       inet->saddr);
1016                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
1017                                       inet->rcv_saddr);
1018                 }
1019
1020                 return err;
1021         }
1022
1023         if (!ipv6_addr_any(&np->rcv_saddr))
1024                 saddr = &np->rcv_saddr;
1025
1026         fl.proto = IPPROTO_DCCP;
1027         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
1028         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
1029         fl.oif = sk->sk_bound_dev_if;
1030         fl.fl_ip_dport = usin->sin6_port;
1031         fl.fl_ip_sport = inet->sport;
1032         security_sk_classify_flow(sk, &fl);
1033
1034         if (np->opt != NULL && np->opt->srcrt != NULL) {
1035                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
1036
1037                 ipv6_addr_copy(&final, &fl.fl6_dst);
1038                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1039                 final_p = &final;
1040         }
1041
1042         err = ip6_dst_lookup(sk, &dst, &fl);
1043         if (err)
1044                 goto failure;
1045
1046         if (final_p)
1047                 ipv6_addr_copy(&fl.fl6_dst, final_p);
1048
1049         err = xfrm_lookup(&dst, &fl, sk, 0);
1050         if (err < 0)
1051                 goto failure;
1052
1053         if (saddr == NULL) {
1054                 saddr = &fl.fl6_src;
1055                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1056         }
1057
1058         /* set the source address */
1059         ipv6_addr_copy(&np->saddr, saddr);
1060         inet->rcv_saddr = LOOPBACK4_IPV6;
1061
1062         __ip6_dst_store(sk, dst, NULL, NULL);
1063
1064         icsk->icsk_ext_hdr_len = 0;
1065         if (np->opt != NULL)
1066                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1067                                           np->opt->opt_nflen);
1068
1069         inet->dport = usin->sin6_port;
1070
1071         dccp_set_state(sk, DCCP_REQUESTING);
1072         err = inet6_hash_connect(&dccp_death_row, sk);
1073         if (err)
1074                 goto late_failure;
1075
1076         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1077                                                       np->daddr.s6_addr32,
1078                                                       inet->sport, inet->dport);
1079         err = dccp_connect(sk);
1080         if (err)
1081                 goto late_failure;
1082
1083         return 0;
1084
1085 late_failure:
1086         dccp_set_state(sk, DCCP_CLOSED);
1087         __sk_dst_reset(sk);
1088 failure:
1089         inet->dport = 0;
1090         sk->sk_route_caps = 0;
1091         return err;
1092 }
1093
1094 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1095         .queue_xmit        = inet6_csk_xmit,
1096         .send_check        = dccp_v6_send_check,
1097         .rebuild_header    = inet6_sk_rebuild_header,
1098         .conn_request      = dccp_v6_conn_request,
1099         .syn_recv_sock     = dccp_v6_request_recv_sock,
1100         .net_header_len    = sizeof(struct ipv6hdr),
1101         .setsockopt        = ipv6_setsockopt,
1102         .getsockopt        = ipv6_getsockopt,
1103         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1104         .sockaddr_len      = sizeof(struct sockaddr_in6),
1105 #ifdef CONFIG_COMPAT
1106         .compat_setsockopt = compat_ipv6_setsockopt,
1107         .compat_getsockopt = compat_ipv6_getsockopt,
1108 #endif
1109 };
1110
1111 /*
1112  *      DCCP over IPv4 via INET6 API
1113  */
1114 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1115         .queue_xmit        = ip_queue_xmit,
1116         .send_check        = dccp_v4_send_check,
1117         .rebuild_header    = inet_sk_rebuild_header,
1118         .conn_request      = dccp_v6_conn_request,
1119         .syn_recv_sock     = dccp_v6_request_recv_sock,
1120         .net_header_len    = sizeof(struct iphdr),
1121         .setsockopt        = ipv6_setsockopt,
1122         .getsockopt        = ipv6_getsockopt,
1123         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1124         .sockaddr_len      = sizeof(struct sockaddr_in6),
1125 #ifdef CONFIG_COMPAT
1126         .compat_setsockopt = compat_ipv6_setsockopt,
1127         .compat_getsockopt = compat_ipv6_getsockopt,
1128 #endif
1129 };
1130
1131 /* NOTE: A lot of things set to zero explicitly by call to
1132  *       sk_alloc() so need not be done here.
1133  */
1134 static int dccp_v6_init_sock(struct sock *sk)
1135 {
1136         static __u8 dccp_v6_ctl_sock_initialized;
1137         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1138
1139         if (err == 0) {
1140                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1141                         dccp_v6_ctl_sock_initialized = 1;
1142                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1143         }
1144
1145         return err;
1146 }
1147
1148 static int dccp_v6_destroy_sock(struct sock *sk)
1149 {
1150         dccp_destroy_sock(sk);
1151         return inet6_destroy_sock(sk);
1152 }
1153
1154 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1155         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1156 };
1157
1158 static struct proto dccp_v6_prot = {
1159         .name              = "DCCPv6",
1160         .owner             = THIS_MODULE,
1161         .close             = dccp_close,
1162         .connect           = dccp_v6_connect,
1163         .disconnect        = dccp_disconnect,
1164         .ioctl             = dccp_ioctl,
1165         .init              = dccp_v6_init_sock,
1166         .setsockopt        = dccp_setsockopt,
1167         .getsockopt        = dccp_getsockopt,
1168         .sendmsg           = dccp_sendmsg,
1169         .recvmsg           = dccp_recvmsg,
1170         .backlog_rcv       = dccp_v6_do_rcv,
1171         .hash              = dccp_v6_hash,
1172         .unhash            = dccp_unhash,
1173         .accept            = inet_csk_accept,
1174         .get_port          = dccp_v6_get_port,
1175         .shutdown          = dccp_shutdown,
1176         .destroy           = dccp_v6_destroy_sock,
1177         .orphan_count      = &dccp_orphan_count,
1178         .max_header        = MAX_DCCP_HEADER,
1179         .obj_size          = sizeof(struct dccp6_sock),
1180         .rsk_prot          = &dccp6_request_sock_ops,
1181         .twsk_prot         = &dccp6_timewait_sock_ops,
1182 #ifdef CONFIG_COMPAT
1183         .compat_setsockopt = compat_dccp_setsockopt,
1184         .compat_getsockopt = compat_dccp_getsockopt,
1185 #endif
1186 };
1187
1188 static struct inet6_protocol dccp_v6_protocol = {
1189         .handler        = dccp_v6_rcv,
1190         .err_handler    = dccp_v6_err,
1191         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1192 };
1193
1194 static struct proto_ops inet6_dccp_ops = {
1195         .family            = PF_INET6,
1196         .owner             = THIS_MODULE,
1197         .release           = inet6_release,
1198         .bind              = inet6_bind,
1199         .connect           = inet_stream_connect,
1200         .socketpair        = sock_no_socketpair,
1201         .accept            = inet_accept,
1202         .getname           = inet6_getname,
1203         .poll              = dccp_poll,
1204         .ioctl             = inet6_ioctl,
1205         .listen            = inet_dccp_listen,
1206         .shutdown          = inet_shutdown,
1207         .setsockopt        = sock_common_setsockopt,
1208         .getsockopt        = sock_common_getsockopt,
1209         .sendmsg           = inet_sendmsg,
1210         .recvmsg           = sock_common_recvmsg,
1211         .mmap              = sock_no_mmap,
1212         .sendpage          = sock_no_sendpage,
1213 #ifdef CONFIG_COMPAT
1214         .compat_setsockopt = compat_sock_common_setsockopt,
1215         .compat_getsockopt = compat_sock_common_getsockopt,
1216 #endif
1217 };
1218
1219 static struct inet_protosw dccp_v6_protosw = {
1220         .type           = SOCK_DCCP,
1221         .protocol       = IPPROTO_DCCP,
1222         .prot           = &dccp_v6_prot,
1223         .ops            = &inet6_dccp_ops,
1224         .capability     = -1,
1225         .flags          = INET_PROTOSW_ICSK,
1226 };
1227
1228 static int __init dccp_v6_init(void)
1229 {
1230         int err = proto_register(&dccp_v6_prot, 1);
1231
1232         if (err != 0)
1233                 goto out;
1234
1235         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1236         if (err != 0)
1237                 goto out_unregister_proto;
1238
1239         inet6_register_protosw(&dccp_v6_protosw);
1240
1241         err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1242                                        SOCK_DCCP, IPPROTO_DCCP);
1243         if (err != 0)
1244                 goto out_unregister_protosw;
1245 out:
1246         return err;
1247 out_unregister_protosw:
1248         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1249         inet6_unregister_protosw(&dccp_v6_protosw);
1250 out_unregister_proto:
1251         proto_unregister(&dccp_v6_prot);
1252         goto out;
1253 }
1254
1255 static void __exit dccp_v6_exit(void)
1256 {
1257         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1258         inet6_unregister_protosw(&dccp_v6_protosw);
1259         proto_unregister(&dccp_v6_prot);
1260 }
1261
1262 module_init(dccp_v6_init);
1263 module_exit(dccp_v6_exit);
1264
1265 /*
1266  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1267  * values directly, Also cover the case where the protocol is not specified,
1268  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1269  */
1270 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1271 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1272 MODULE_LICENSE("GPL");
1273 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1274 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");