net/dccp/ipv6.c

   1 /*
   2  *      DCCP over IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Based on net/dccp6/ipv6.c
   6  *
   7  *      Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/module.h>
  17 #include <linux/random.h>
  18 #include <linux/xfrm.h>
  19
  20 #include <net/addrconf.h>
  21 #include <net/inet_common.h>
  22 #include <net/inet_hashtables.h>
  23 #include <net/inet_sock.h>
  24 #include <net/inet6_connection_sock.h>
  25 #include <net/inet6_hashtables.h>
  26 #include <net/ip6_route.h>
  27 #include <net/ipv6.h>
  28 #include <net/protocol.h>
  29 #include <net/transp_v6.h>
  30 #include <net/ip6_checksum.h>
  31 #include <net/xfrm.h>
  32
  33 #include "dccp.h"
  34 #include "ipv6.h"
  35
  36 /* Socket used for sending RSTs and ACKs */
  37 static struct socket *dccp_v6_ctl_socket;
  38
  39 static void dccp_v6_ctl_send_reset(struct sk_buff *skb);
  40 static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
  41                                    struct request_sock *req);
  42 static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb);
  43
  44 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
  45
  46 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  47 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  48
  49 static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
  50 {
  51         return inet_csk_get_port(&dccp_hashinfo, sk, snum,
  52                                  inet6_csk_bind_conflict);
  53 }
  54
  55 static void dccp_v6_hash(struct sock *sk)
  56 {
  57         if (sk->sk_state != DCCP_CLOSED) {
  58                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
  59                         dccp_hash(sk);
  60                         return;
  61                 }
  62                 local_bh_disable();
  63                 __inet6_hash(&dccp_hashinfo, sk);
  64                 local_bh_enable();
  65         }
  66 }
  67
  68 static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len,
  69                                 struct in6_addr *saddr,
  70                                 struct in6_addr *daddr,
  71                                 unsigned long base)
  72 {
  73         return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base);
  74 }
  75
  76 static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
  77 {
  78         const struct dccp_hdr *dh = dccp_hdr(skb);
  79
  80         if (skb->protocol == htons(ETH_P_IPV6))
  81                 return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
  82                                                     skb->nh.ipv6h->saddr.s6_addr32,
  83                                                     dh->dccph_dport,
  84                                                     dh->dccph_sport);
  85         else
  86                 return secure_dccp_sequence_number(skb->nh.iph->daddr,
  87                                                    skb->nh.iph->saddr,
  88                                                    dh->dccph_dport,
  89                                                    dh->dccph_sport);
  90 }
  91
  92 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
  93                            int addr_len)
  94 {
  95         struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
  96         struct inet_connection_sock *icsk = inet_csk(sk);
  97         struct inet_sock *inet = inet_sk(sk);
  98         struct ipv6_pinfo *np = inet6_sk(sk);
  99         struct dccp_sock *dp = dccp_sk(sk);
 100         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 101         struct flowi fl;
 102         struct dst_entry *dst;
 103         int addr_type;
 104         int err;
 105
 106         dp->dccps_role = DCCP_ROLE_CLIENT;
 107
 108         if (addr_len < SIN6_LEN_RFC2133)
 109                 return -EINVAL;
 110
 111         if (usin->sin6_family != AF_INET6)
 112                 return -EAFNOSUPPORT;
 113
 114         memset(&fl, 0, sizeof(fl));
 115
 116         if (np->sndflow) {
 117                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 118                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 119                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 120                         struct ip6_flowlabel *flowlabel;
 121                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 122                         if (flowlabel == NULL)
 123                                 return -EINVAL;
 124                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 125                         fl6_sock_release(flowlabel);
 126                 }
 127         }
 128
 129         /*
 130          *      connect() to INADDR_ANY means loopback (BSD'ism).
 131          */
 132
 133         if (ipv6_addr_any(&usin->sin6_addr))
 134                 usin->sin6_addr.s6_addr[15] = 0x1;
 135
 136         addr_type = ipv6_addr_type(&usin->sin6_addr);
 137
 138         if(addr_type & IPV6_ADDR_MULTICAST)
 139                 return -ENETUNREACH;
 140
 141         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 142                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 143                     usin->sin6_scope_id) {
 144                         /* If interface is set while binding, indices
 145                          * must coincide.
 146                          */
 147                         if (sk->sk_bound_dev_if &&
 148                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 149                                 return -EINVAL;
 150
 151                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 152                 }
 153
 154                 /* Connect to link-local address requires an interface */
 155                 if (!sk->sk_bound_dev_if)
 156                         return -EINVAL;
 157         }
 158
 159         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 160         np->flow_label = fl.fl6_flowlabel;
 161
 162         /*
 163          *      DCCP over IPv4
 164          */
 165
 166         if (addr_type == IPV6_ADDR_MAPPED) {
 167                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 168                 struct sockaddr_in sin;
 169
 170                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 171
 172                 if (__ipv6_only_sock(sk))
 173                         return -ENETUNREACH;
 174
 175                 sin.sin_family = AF_INET;
 176                 sin.sin_port = usin->sin6_port;
 177                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 178
 179                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 180                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 181
 182                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 183
 184                 if (err) {
 185                         icsk->icsk_ext_hdr_len = exthdrlen;
 186                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 187                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 188                         goto failure;
 189                 } else {
 190                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
 191                                       inet->saddr);
 192                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
 193                                       inet->rcv_saddr);
 194                 }
 195
 196                 return err;
 197         }
 198
 199         if (!ipv6_addr_any(&np->rcv_saddr))
 200                 saddr = &np->rcv_saddr;
 201
 202         fl.proto = IPPROTO_DCCP;
 203         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 204         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 205         fl.oif = sk->sk_bound_dev_if;
 206         fl.fl_ip_dport = usin->sin6_port;
 207         fl.fl_ip_sport = inet->sport;
 208
 209         if (np->opt && np->opt->srcrt) {
 210                 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 211                 ipv6_addr_copy(&final, &fl.fl6_dst);
 212                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 213                 final_p = &final;
 214         }
 215
 216         err = ip6_dst_lookup(sk, &dst, &fl);
 217         if (err)
 218                 goto failure;
 219         if (final_p)
 220                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 221
 222         if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 223                 goto failure;
 224
 225         if (saddr == NULL) {
 226                 saddr = &fl.fl6_src;
 227                 ipv6_addr_copy(&np->rcv_saddr, saddr);
 228         }
 229
 230         /* set the source address */
 231         ipv6_addr_copy(&np->saddr, saddr);
 232         inet->rcv_saddr = LOOPBACK4_IPV6;
 233
 234         ip6_dst_store(sk, dst, NULL);
 235
 236         icsk->icsk_ext_hdr_len = 0;
 237         if (np->opt)
 238                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
 239                                           np->opt->opt_nflen);
 240
 241         inet->dport = usin->sin6_port;
 242
 243         dccp_set_state(sk, DCCP_REQUESTING);
 244         err = inet6_hash_connect(&dccp_death_row, sk);
 245         if (err)
 246                 goto late_failure;
 247         /* FIXME */
 248 #if 0
 249         dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32,
 250                                                        np->daddr.s6_addr32,
 251                                                        inet->sport,
 252                                                        inet->dport);
 253 #endif
 254         err = dccp_connect(sk);
 255         if (err)
 256                 goto late_failure;
 257
 258         return 0;
 259
 260 late_failure:
 261         dccp_set_state(sk, DCCP_CLOSED);
 262         __sk_dst_reset(sk);
 263 failure:
 264         inet->dport = 0;
 265         sk->sk_route_caps = 0;
 266         return err;
 267 }
 268
 269 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 270                         int type, int code, int offset, __be32 info)
 271 {
 272         struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
 273         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
 274         struct ipv6_pinfo *np;
 275         struct sock *sk;
 276         int err;
 277         __u64 seq;
 278
 279         sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
 280                           &hdr->saddr, dh->dccph_sport, skb->dev->ifindex);
 281
 282         if (sk == NULL) {
 283                 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
 284                 return;
 285         }
 286
 287         if (sk->sk_state == DCCP_TIME_WAIT) {
 288                 inet_twsk_put((struct inet_timewait_sock *)sk);
 289                 return;
 290         }
 291
 292         bh_lock_sock(sk);
 293         if (sock_owned_by_user(sk))
 294                 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
 295
 296         if (sk->sk_state == DCCP_CLOSED)
 297                 goto out;
 298
 299         np = inet6_sk(sk);
 300
 301         if (type == ICMPV6_PKT_TOOBIG) {
 302                 struct dst_entry *dst = NULL;
 303
 304                 if (sock_owned_by_user(sk))
 305                         goto out;
 306                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 307                         goto out;
 308
 309                 /* icmp should have updated the destination cache entry */
 310                 dst = __sk_dst_check(sk, np->dst_cookie);
 311
 312                 if (dst == NULL) {
 313                         struct inet_sock *inet = inet_sk(sk);
 314                         struct flowi fl;
 315
 316                         /* BUGGG_FUTURE: Again, it is not clear how
 317                            to handle rthdr case. Ignore this complexity
 318                            for now.
 319                          */
 320                         memset(&fl, 0, sizeof(fl));
 321                         fl.proto = IPPROTO_DCCP;
 322                         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 323                         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 324                         fl.oif = sk->sk_bound_dev_if;
 325                         fl.fl_ip_dport = inet->dport;
 326                         fl.fl_ip_sport = inet->sport;
 327
 328                         if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
 329                                 sk->sk_err_soft = -err;
 330                                 goto out;
 331                         }
 332
 333                         if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 334                                 sk->sk_err_soft = -err;
 335                                 goto out;
 336                         }
 337
 338                 } else
 339                         dst_hold(dst);
 340
 341                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 342                         dccp_sync_mss(sk, dst_mtu(dst));
 343                 } /* else let the usual retransmit timer handle it */
 344                 dst_release(dst);
 345                 goto out;
 346         }
 347
 348         icmpv6_err_convert(type, code, &err);
 349
 350         seq = DCCP_SKB_CB(skb)->dccpd_seq;
 351         /* Might be for an request_sock */
 352         switch (sk->sk_state) {
 353                 struct request_sock *req, **prev;
 354         case DCCP_LISTEN:
 355                 if (sock_owned_by_user(sk))
 356                         goto out;
 357
 358                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 359                                            &hdr->daddr, &hdr->saddr,
 360                                            inet6_iif(skb));
 361                 if (!req)
 362                         goto out;
 363
 364                 /* ICMPs are not backlogged, hence we cannot get
 365                  * an established socket here.
 366                  */
 367                 BUG_TRAP(req->sk == NULL);
 368
 369                 if (seq != dccp_rsk(req)->dreq_iss) {
 370                         NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
 371                         goto out;
 372                 }
 373
 374                 inet_csk_reqsk_queue_drop(sk, req, prev);
 375                 goto out;
 376
 377         case DCCP_REQUESTING:
 378         case DCCP_RESPOND:  /* Cannot happen.
 379                                It can, it SYNs are crossed. --ANK */
 380                 if (!sock_owned_by_user(sk)) {
 381                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 382                         sk->sk_err = err;
 383                         /*
 384                          * Wake people up to see the error
 385                          * (see connect in sock.c)
 386                          */
 387                         sk->sk_error_report(sk);
 388
 389                         dccp_done(sk);
 390                 } else
 391                         sk->sk_err_soft = err;
 392                 goto out;
 393         }
 394
 395         if (!sock_owned_by_user(sk) && np->recverr) {
 396                 sk->sk_err = err;
 397                 sk->sk_error_report(sk);
 398         } else
 399                 sk->sk_err_soft = err;
 400
 401 out:
 402         bh_unlock_sock(sk);
 403         sock_put(sk);
 404 }
 405
 406
 407 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
 408                                  struct dst_entry *dst)
 409 {
 410         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 411         struct ipv6_pinfo *np = inet6_sk(sk);
 412         struct sk_buff *skb;
 413         struct ipv6_txoptions *opt = NULL;
 414         struct in6_addr *final_p = NULL, final;
 415         struct flowi fl;
 416         int err = -1;
 417
 418         memset(&fl, 0, sizeof(fl));
 419         fl.proto = IPPROTO_DCCP;
 420         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 421         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 422         fl.fl6_flowlabel = 0;
 423         fl.oif = ireq6->iif;
 424         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 425         fl.fl_ip_sport = inet_sk(sk)->sport;
 426
 427         if (dst == NULL) {
 428                 opt = np->opt;
 429                 if (opt == NULL &&
 430                     np->rxopt.bits.osrcrt == 2 &&
 431                     ireq6->pktopts) {
 432                         struct sk_buff *pktopts = ireq6->pktopts;
 433                         struct inet6_skb_parm *rxopt = IP6CB(pktopts);
 434                         if (rxopt->srcrt)
 435                                 opt = ipv6_invert_rthdr(sk,
 436                                         (struct ipv6_rt_hdr *)(pktopts->nh.raw +
 437                                                                rxopt->srcrt));
 438                 }
 439
 440                 if (opt && opt->srcrt) {
 441                         struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 442                         ipv6_addr_copy(&final, &fl.fl6_dst);
 443                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 444                         final_p = &final;
 445                 }
 446
 447                 err = ip6_dst_lookup(sk, &dst, &fl);
 448                 if (err)
 449                         goto done;
 450                 if (final_p)
 451                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 452                 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 453                         goto done;
 454         }
 455
 456         skb = dccp_make_response(sk, dst, req);
 457         if (skb != NULL) {
 458                 struct dccp_hdr *dh = dccp_hdr(skb);
 459                 dh->dccph_checksum = dccp_v6_check(dh, skb->len,
 460                                                    &ireq6->loc_addr,
 461                                                    &ireq6->rmt_addr,
 462                                                    csum_partial((char *)dh,
 463                                                                 skb->len,
 464                                                                 skb->csum));
 465                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 466                 err = ip6_xmit(sk, skb, &fl, opt, 0);
 467                 if (err == NET_XMIT_CN)
 468                         err = 0;
 469         }
 470
 471 done:
 472         if (opt && opt != np->opt)
 473                 sock_kfree_s(sk, opt, opt->tot_len);
 474         dst_release(dst);
 475         return err;
 476 }
 477
 478 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 479 {
 480         if (inet6_rsk(req)->pktopts != NULL)
 481                 kfree_skb(inet6_rsk(req)->pktopts);
 482 }
 483
 484 static struct request_sock_ops dccp6_request_sock_ops = {
 485         .family         = AF_INET6,
 486         .obj_size       = sizeof(struct dccp6_request_sock),
 487         .rtx_syn_ack    = dccp_v6_send_response,
 488         .send_ack       = dccp_v6_reqsk_send_ack,
 489         .destructor     = dccp_v6_reqsk_destructor,
 490         .send_reset     = dccp_v6_ctl_send_reset,
 491 };
 492
 493 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
 494         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
 495 };
 496
 497 static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
 498 {
 499         struct ipv6_pinfo *np = inet6_sk(sk);
 500         struct dccp_hdr *dh = dccp_hdr(skb);
 501
 502         dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr,
 503                                              len, IPPROTO_DCCP,
 504                                              csum_partial((char *)dh,
 505                                                           dh->dccph_doff << 2,
 506                                                           skb->csum));
 507 }
 508
 509 static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
 510 {
 511         struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
 512         const int dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
 513                                        sizeof(struct dccp_hdr_ext) +
 514                                        sizeof(struct dccp_hdr_reset);
 515         struct sk_buff *skb;
 516         struct flowi fl;
 517         u64 seqno;
 518
 519         if (rxdh->dccph_type == DCCP_PKT_RESET)
 520                 return;
 521
 522         if (!ipv6_unicast_destination(rxskb))
 523                 return;
 524
 525         /*
 526          * We need to grab some memory, and put together an RST,
 527          * and then put it into the queue to be sent.
 528          */
 529
 530         skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) +
 531                         dccp_hdr_reset_len, GFP_ATOMIC);
 532         if (skb == NULL)
 533                 return;
 534
 535         skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) +
 536                     dccp_hdr_reset_len);
 537
 538         skb->h.raw = skb_push(skb, dccp_hdr_reset_len);
 539         dh = dccp_hdr(skb);
 540         memset(dh, 0, dccp_hdr_reset_len);
 541
 542         /* Swap the send and the receive. */
 543         dh->dccph_type  = DCCP_PKT_RESET;
 544         dh->dccph_sport = rxdh->dccph_dport;
 545         dh->dccph_dport = rxdh->dccph_sport;
 546         dh->dccph_doff  = dccp_hdr_reset_len / 4;
 547         dh->dccph_x     = 1;
 548         dccp_hdr_reset(skb)->dccph_reset_code =
 549                                 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
 550
 551         /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */
 552         seqno = 0;
 553         if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
 554                 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
 555
 556         dccp_hdr_set_seq(dh, seqno);
 557         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
 558                          DCCP_SKB_CB(rxskb)->dccpd_seq);
 559
 560         memset(&fl, 0, sizeof(fl));
 561         ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
 562         ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
 563         dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
 564                                              sizeof(*dh), IPPROTO_DCCP,
 565                                              skb->csum);
 566         fl.proto = IPPROTO_DCCP;
 567         fl.oif = inet6_iif(rxskb);
 568         fl.fl_ip_dport = dh->dccph_dport;
 569         fl.fl_ip_sport = dh->dccph_sport;
 570
 571         /* sk = NULL, but it is safe for now. RST socket required. */
 572         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
 573                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 574                         ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
 575                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 576                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 577                         return;
 578                 }
 579         }
 580
 581         kfree_skb(skb);
 582 }
 583
 584 static void dccp_v6_ctl_send_ack(struct sk_buff *rxskb)
 585 {
 586         struct flowi fl;
 587         struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
 588         const int dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
 589                                      sizeof(struct dccp_hdr_ext) +
 590                                      sizeof(struct dccp_hdr_ack_bits);
 591         struct sk_buff *skb;
 592
 593         skb = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) +
 594                         dccp_hdr_ack_len, GFP_ATOMIC);
 595         if (skb == NULL)
 596                 return;
 597
 598         skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr) +
 599                          dccp_hdr_ack_len);
 600
 601         skb->h.raw = skb_push(skb, dccp_hdr_ack_len);
 602         dh = dccp_hdr(skb);
 603         memset(dh, 0, dccp_hdr_ack_len);
 604
 605         /* Build DCCP header and checksum it. */
 606         dh->dccph_type  = DCCP_PKT_ACK;
 607         dh->dccph_sport = rxdh->dccph_dport;
 608         dh->dccph_dport = rxdh->dccph_sport;
 609         dh->dccph_doff  = dccp_hdr_ack_len / 4;
 610         dh->dccph_x     = 1;
 611
 612         dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq);
 613         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
 614                          DCCP_SKB_CB(rxskb)->dccpd_seq);
 615
 616         memset(&fl, 0, sizeof(fl));
 617         ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
 618         ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
 619
 620         /* FIXME: calculate checksum, IPv4 also should... */
 621
 622         fl.proto = IPPROTO_DCCP;
 623         fl.oif = inet6_iif(rxskb);
 624         fl.fl_ip_dport = dh->dccph_dport;
 625         fl.fl_ip_sport = dh->dccph_sport;
 626
 627         if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
 628                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 629                         ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
 630                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 631                         return;
 632                 }
 633         }
 634
 635         kfree_skb(skb);
 636 }
 637
 638 static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
 639                                    struct request_sock *req)
 640 {
 641         dccp_v6_ctl_send_ack(skb);
 642 }
 643
 644 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 645 {
 646         const struct dccp_hdr *dh = dccp_hdr(skb);
 647         const struct ipv6hdr *iph = skb->nh.ipv6h;
 648         struct sock *nsk;
 649         struct request_sock **prev;
 650         /* Find possible connection requests. */
 651         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 652                                                         dh->dccph_sport,
 653                                                         &iph->saddr,
 654                                                         &iph->daddr,
 655                                                         inet6_iif(skb));
 656         if (req != NULL)
 657                 return dccp_check_req(sk, skb, req, prev);
 658
 659         nsk = __inet6_lookup_established(&dccp_hashinfo,
 660                                          &iph->saddr, dh->dccph_sport,
 661                                          &iph->daddr, ntohs(dh->dccph_dport),
 662                                          inet6_iif(skb));
 663
 664         if (nsk != NULL) {
 665                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 666                         bh_lock_sock(nsk);
 667                         return nsk;
 668                 }
 669                 inet_twsk_put((struct inet_timewait_sock *)nsk);
 670                 return NULL;
 671         }
 672
 673         return sk;
 674 }
 675
 676 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 677 {
 678         struct inet_request_sock *ireq;
 679         struct dccp_sock dp;
 680         struct request_sock *req;
 681         struct dccp_request_sock *dreq;
 682         struct inet6_request_sock *ireq6;
 683         struct ipv6_pinfo *np = inet6_sk(sk);
 684         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 685         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 686         __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
 687
 688         if (skb->protocol == htons(ETH_P_IP))
 689                 return dccp_v4_conn_request(sk, skb);
 690
 691         if (!ipv6_unicast_destination(skb))
 692                 goto drop;
 693
 694         if (dccp_bad_service_code(sk, service)) {
 695                 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 696                 goto drop;
 697         }
 698         /*
 699          *      There are no SYN attacks on IPv6, yet...
 700          */
 701         if (inet_csk_reqsk_queue_is_full(sk))
 702                 goto drop;
 703
 704         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 705                 goto drop;
 706
 707         req = inet6_reqsk_alloc(sk->sk_prot->rsk_prot);
 708         if (req == NULL)
 709                 goto drop;
 710
 711         /* FIXME: process options */
 712
 713         dccp_openreq_init(req, &dp, skb);
 714
 715         ireq6 = inet6_rsk(req);
 716         ireq = inet_rsk(req);
 717         ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
 718         ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
 719         req->rcv_wnd    = 100; /* Fake, option parsing will get the
 720                                   right value */
 721         ireq6->pktopts  = NULL;
 722
 723         if (ipv6_opt_accepted(sk, skb) ||
 724             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 725             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 726                 atomic_inc(&skb->users);
 727                 ireq6->pktopts = skb;
 728         }
 729         ireq6->iif = sk->sk_bound_dev_if;
 730
 731         /* So that link locals have meaning */
 732         if (!sk->sk_bound_dev_if &&
 733             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 734                 ireq6->iif = inet6_iif(skb);
 735
 736         /*
 737          * Step 3: Process LISTEN state
 738          *
 739          * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 740          *
 741          * In fact we defer setting S.GSR, S.SWL, S.SWH to
 742          * dccp_create_openreq_child.
 743          */
 744         dreq = dccp_rsk(req);
 745         dreq->dreq_isr     = dcb->dccpd_seq;
 746         dreq->dreq_iss     = dccp_v6_init_sequence(sk, skb);
 747         dreq->dreq_service = service;
 748
 749         if (dccp_v6_send_response(sk, req, NULL))
 750                 goto drop_and_free;
 751
 752         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 753         return 0;
 754
 755 drop_and_free:
 756         reqsk_free(req);
 757 drop:
 758         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 759         dcb->dccpd_reset_code = reset_code;
 760         return -1;
 761 }
 762
 763 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 764                                               struct sk_buff *skb,
 765                                               struct request_sock *req,
 766                                               struct dst_entry *dst)
 767 {
 768         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 769         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 770         struct inet_sock *newinet;
 771         struct dccp_sock *newdp;
 772         struct dccp6_sock *newdp6;
 773         struct sock *newsk;
 774         struct ipv6_txoptions *opt;
 775
 776         if (skb->protocol == htons(ETH_P_IP)) {
 777                 /*
 778                  *      v6 mapped
 779                  */
 780
 781                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 782                 if (newsk == NULL)
 783                         return NULL;
 784
 785                 newdp6 = (struct dccp6_sock *)newsk;
 786                 newdp = dccp_sk(newsk);
 787                 newinet = inet_sk(newsk);
 788                 newinet->pinet6 = &newdp6->inet6;
 789                 newnp = inet6_sk(newsk);
 790
 791                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 792
 793                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 794                               newinet->daddr);
 795
 796                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 797                               newinet->saddr);
 798
 799                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 800
 801                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 802                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 803                 newnp->pktoptions  = NULL;
 804                 newnp->opt         = NULL;
 805                 newnp->mcast_oif   = inet6_iif(skb);
 806                 newnp->mcast_hops  = skb->nh.ipv6h->hop_limit;
 807
 808                 /*
 809                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 810                  * here, dccp_create_openreq_child now does this for us, see the comment in
 811                  * that function for the gory details. -acme
 812                  */
 813
 814                 /* It is tricky place. Until this moment IPv4 tcp
 815                    worked with IPv6 icsk.icsk_af_ops.
 816                    Sync it now.
 817                  */
 818                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 819
 820                 return newsk;
 821         }
 822
 823         opt = np->opt;
 824
 825         if (sk_acceptq_is_full(sk))
 826                 goto out_overflow;
 827
 828         if (np->rxopt.bits.osrcrt == 2 &&
 829             opt == NULL && ireq6->pktopts) {
 830                 struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
 831                 if (rxopt->srcrt)
 832                         opt = ipv6_invert_rthdr(sk,
 833                                 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
 834                                                        rxopt->srcrt));
 835         }
 836
 837         if (dst == NULL) {
 838                 struct in6_addr *final_p = NULL, final;
 839                 struct flowi fl;
 840
 841                 memset(&fl, 0, sizeof(fl));
 842                 fl.proto = IPPROTO_DCCP;
 843                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 844                 if (opt && opt->srcrt) {
 845                         struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
 846                         ipv6_addr_copy(&final, &fl.fl6_dst);
 847                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 848                         final_p = &final;
 849                 }
 850                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 851                 fl.oif = sk->sk_bound_dev_if;
 852                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 853                 fl.fl_ip_sport = inet_sk(sk)->sport;
 854
 855                 if (ip6_dst_lookup(sk, &dst, &fl))
 856                         goto out;
 857
 858                 if (final_p)
 859                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 860
 861                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 862                         goto out;
 863         }
 864
 865         newsk = dccp_create_openreq_child(sk, req, skb);
 866         if (newsk == NULL)
 867                 goto out;
 868
 869         /*
 870          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 871          * count here, dccp_create_openreq_child now does this for us, see the
 872          * comment in that function for the gory details. -acme
 873          */
 874
 875         ip6_dst_store(newsk, dst, NULL);
 876         newsk->sk_route_caps = dst->dev->features &
 877                 ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
 878
 879         newdp6 = (struct dccp6_sock *)newsk;
 880         newinet = inet_sk(newsk);
 881         newinet->pinet6 = &newdp6->inet6;
 882         newdp = dccp_sk(newsk);
 883         newnp = inet6_sk(newsk);
 884
 885         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 886
 887         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 888         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 889         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 890         newsk->sk_bound_dev_if = ireq6->iif;
 891
 892         /* Now IPv6 options...
 893
 894            First: no IPv4 options.
 895          */
 896         newinet->opt = NULL;
 897
 898         /* Clone RX bits */
 899         newnp->rxopt.all = np->rxopt.all;
 900
 901         /* Clone pktoptions received with SYN */
 902         newnp->pktoptions = NULL;
 903         if (ireq6->pktopts != NULL) {
 904                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 905                 kfree_skb(ireq6->pktopts);
 906                 ireq6->pktopts = NULL;
 907                 if (newnp->pktoptions)
 908                         skb_set_owner_r(newnp->pktoptions, newsk);
 909         }
 910         newnp->opt        = NULL;
 911         newnp->mcast_oif  = inet6_iif(skb);
 912         newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
 913
 914         /* Clone native IPv6 options from listening socket (if any)
 915
 916            Yes, keeping reference count would be much more clever,
 917            but we make one more one thing there: reattach optmem
 918            to newsk.
 919          */
 920         if (opt) {
 921                 newnp->opt = ipv6_dup_options(newsk, opt);
 922                 if (opt != np->opt)
 923                         sock_kfree_s(sk, opt, opt->tot_len);
 924         }
 925
 926         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 927         if (newnp->opt)
 928                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 929                                                      newnp->opt->opt_flen);
 930
 931         dccp_sync_mss(newsk, dst_mtu(dst));
 932
 933         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 934
 935         __inet6_hash(&dccp_hashinfo, newsk);
 936         inet_inherit_port(&dccp_hashinfo, sk, newsk);
 937
 938         return newsk;
 939
 940 out_overflow:
 941         NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
 942 out:
 943         NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
 944         if (opt && opt != np->opt)
 945                 sock_kfree_s(sk, opt, opt->tot_len);
 946         dst_release(dst);
 947         return NULL;
 948 }
 949
 950 /* The socket must have it's spinlock held when we get
 951  * here.
 952  *
 953  * We have a potential double-lock case here, so even when
 954  * doing backlog processing we use the BH locking scheme.
 955  * This is because we cannot sleep with the original spinlock
 956  * held.
 957  */
 958 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 959 {
 960         struct ipv6_pinfo *np = inet6_sk(sk);
 961         struct sk_buff *opt_skb = NULL;
 962
 963         /* Imagine: socket is IPv6. IPv4 packet arrives,
 964            goes to IPv4 receive handler and backlogged.
 965            From backlog it always goes here. Kerboom...
 966            Fortunately, dccp_rcv_established and rcv_established
 967            handle them correctly, but it is not case with
 968            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 969          */
 970
 971         if (skb->protocol == htons(ETH_P_IP))
 972                 return dccp_v4_do_rcv(sk, skb);
 973
 974         if (sk_filter(sk, skb, 0))
 975                 goto discard;
 976
 977         /*
 978          *      socket locking is here for SMP purposes as backlog rcv
 979          *      is currently called with bh processing disabled.
 980          */
 981
 982         /* Do Stevens' IPV6_PKTOPTIONS.
 983
 984            Yes, guys, it is the only place in our code, where we
 985            may make it not affecting IPv4.
 986            The rest of code is protocol independent,
 987            and I do not like idea to uglify IPv4.
 988
 989            Actually, all the idea behind IPV6_PKTOPTIONS
 990            looks not very well thought. For now we latch
 991            options, received in the last packet, enqueued
 992            by tcp. Feel free to propose better solution.
 993                                                --ANK (980728)
 994          */
 995         if (np->rxopt.all)
 996                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 997
 998         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 999                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
1000                         goto reset;
1001                 return 0;
1002         }
1003
1004         if (sk->sk_state == DCCP_LISTEN) {
1005                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
1006                 if (!nsk)
1007                         goto discard;
1008
1009                 /*
1010                  * Queue it on the new socket if the new socket is active,
1011                  * otherwise we just shortcircuit this and continue with
1012                  * the new socket..
1013                  */
1014                 if(nsk != sk) {
1015                         if (dccp_child_process(sk, nsk, skb))
1016                                 goto reset;
1017                         if (opt_skb)
1018                                 __kfree_skb(opt_skb);
1019                         return 0;
1020                 }
1021         }
1022
1023         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
1024                 goto reset;
1025         return 0;
1026
1027 reset:
1028         dccp_v6_ctl_send_reset(skb);
1029 discard:
1030         if (opt_skb)
1031                 __kfree_skb(opt_skb);
1032         kfree_skb(skb);
1033         return 0;
1034 }
1035
1036 static int dccp_v6_rcv(struct sk_buff **pskb)
1037 {
1038         const struct dccp_hdr *dh;
1039         struct sk_buff *skb = *pskb;
1040         struct sock *sk;
1041
1042         /* Step 1: Check header basics: */
1043
1044         if (dccp_invalid_packet(skb))
1045                 goto discard_it;
1046
1047         dh = dccp_hdr(skb);
1048
1049         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(skb);
1050         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
1051
1052         if (dccp_packet_without_ack(skb))
1053                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
1054         else
1055                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
1056
1057         /* Step 2:
1058          *      Look up flow ID in table and get corresponding socket */
1059         sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
1060                             dh->dccph_sport,
1061                             &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
1062                             inet6_iif(skb));
1063         /*
1064          * Step 2:
1065          *      If no socket ...
1066          *              Generate Reset(No Connection) unless P.type == Reset
1067          *              Drop packet and return
1068          */
1069         if (sk == NULL)
1070                 goto no_dccp_socket;
1071
1072         /*
1073          * Step 2:
1074          *      ... or S.state == TIMEWAIT,
1075          *              Generate Reset(No Connection) unless P.type == Reset
1076          *              Drop packet and return
1077          */
1078
1079         if (sk->sk_state == DCCP_TIME_WAIT)
1080                 goto do_time_wait;
1081
1082         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1083                 goto discard_and_relse;
1084
1085         return sk_receive_skb(sk, skb) ? -1 : 0;
1086
1087 no_dccp_socket:
1088         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1089                 goto discard_it;
1090         /*
1091          * Step 2:
1092          *              Generate Reset(No Connection) unless P.type == Reset
1093          *              Drop packet and return
1094          */
1095         if (dh->dccph_type != DCCP_PKT_RESET) {
1096                 DCCP_SKB_CB(skb)->dccpd_reset_code =
1097                                         DCCP_RESET_CODE_NO_CONNECTION;
1098                 dccp_v6_ctl_send_reset(skb);
1099         }
1100 discard_it:
1101
1102         /*
1103          *      Discard frame
1104          */
1105
1106         kfree_skb(skb);
1107         return 0;
1108
1109 discard_and_relse:
1110         sock_put(sk);
1111         goto discard_it;
1112
1113 do_time_wait:
1114         inet_twsk_put((struct inet_timewait_sock *)sk);
1115         goto no_dccp_socket;
1116 }
1117
1118 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1119         .queue_xmit     =       inet6_csk_xmit,
1120         .send_check     =       dccp_v6_send_check,
1121         .rebuild_header =       inet6_sk_rebuild_header,
1122         .conn_request   =       dccp_v6_conn_request,
1123         .syn_recv_sock  =       dccp_v6_request_recv_sock,
1124         .net_header_len =       sizeof(struct ipv6hdr),
1125         .setsockopt     =       ipv6_setsockopt,
1126         .getsockopt     =       ipv6_getsockopt,
1127         .addr2sockaddr  =       inet6_csk_addr2sockaddr,
1128         .sockaddr_len   =       sizeof(struct sockaddr_in6)
1129 };
1130
1131 /*
1132  *      DCCP over IPv4 via INET6 API
1133  */
1134 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1135         .queue_xmit     =       ip_queue_xmit,
1136         .send_check     =       dccp_v4_send_check,
1137         .rebuild_header =       inet_sk_rebuild_header,
1138         .conn_request   =       dccp_v6_conn_request,
1139         .syn_recv_sock  =       dccp_v6_request_recv_sock,
1140         .net_header_len =       sizeof(struct iphdr),
1141         .setsockopt     =       ipv6_setsockopt,
1142         .getsockopt     =       ipv6_getsockopt,
1143         .addr2sockaddr  =       inet6_csk_addr2sockaddr,
1144         .sockaddr_len   =       sizeof(struct sockaddr_in6)
1145 };
1146
1147 /* NOTE: A lot of things set to zero explicitly by call to
1148  *       sk_alloc() so need not be done here.
1149  */
1150 static int dccp_v6_init_sock(struct sock *sk)
1151 {
1152         static __u8 dccp_v6_ctl_sock_initialized;
1153         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1154
1155         if (err == 0) {
1156                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1157                         dccp_v6_ctl_sock_initialized = 1;
1158                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1159         }
1160
1161         return err;
1162 }
1163
1164 static int dccp_v6_destroy_sock(struct sock *sk)
1165 {
1166         dccp_destroy_sock(sk);
1167         return inet6_destroy_sock(sk);
1168 }
1169
1170 static struct proto dccp_v6_prot = {
1171         .name                   = "DCCPv6",
1172         .owner                  = THIS_MODULE,
1173         .close                  = dccp_close,
1174         .connect                = dccp_v6_connect,
1175         .disconnect             = dccp_disconnect,
1176         .ioctl                  = dccp_ioctl,
1177         .init                   = dccp_v6_init_sock,
1178         .setsockopt             = dccp_setsockopt,
1179         .getsockopt             = dccp_getsockopt,
1180         .sendmsg                = dccp_sendmsg,
1181         .recvmsg                = dccp_recvmsg,
1182         .backlog_rcv            = dccp_v6_do_rcv,
1183         .hash                   = dccp_v6_hash,
1184         .unhash                 = dccp_unhash,
1185         .accept                 = inet_csk_accept,
1186         .get_port               = dccp_v6_get_port,
1187         .shutdown               = dccp_shutdown,
1188         .destroy                = dccp_v6_destroy_sock,
1189         .orphan_count           = &dccp_orphan_count,
1190         .max_header             = MAX_DCCP_HEADER,
1191         .obj_size               = sizeof(struct dccp6_sock),
1192         .rsk_prot               = &dccp6_request_sock_ops,
1193         .twsk_prot              = &dccp6_timewait_sock_ops,
1194 };
1195
1196 static struct inet6_protocol dccp_v6_protocol = {
1197         .handler        =       dccp_v6_rcv,
1198         .err_handler    =       dccp_v6_err,
1199         .flags          =       INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1200 };
1201
1202 static struct proto_ops inet6_dccp_ops = {
1203         .family         = PF_INET6,
1204         .owner          = THIS_MODULE,
1205         .release        = inet6_release,
1206         .bind           = inet6_bind,
1207         .connect        = inet_stream_connect,
1208         .socketpair     = sock_no_socketpair,
1209         .accept         = inet_accept,
1210         .getname        = inet6_getname,
1211         .poll           = dccp_poll,
1212         .ioctl          = inet6_ioctl,
1213         .listen         = inet_dccp_listen,
1214         .shutdown       = inet_shutdown,
1215         .setsockopt     = sock_common_setsockopt,
1216         .getsockopt     = sock_common_getsockopt,
1217         .sendmsg        = inet_sendmsg,
1218         .recvmsg        = sock_common_recvmsg,
1219         .mmap           = sock_no_mmap,
1220         .sendpage       = sock_no_sendpage,
1221 };
1222
1223 static struct inet_protosw dccp_v6_protosw = {
1224         .type           = SOCK_DCCP,
1225         .protocol       = IPPROTO_DCCP,
1226         .prot           = &dccp_v6_prot,
1227         .ops            = &inet6_dccp_ops,
1228         .capability     = -1,
1229         .flags          = INET_PROTOSW_ICSK,
1230 };
1231
1232 static int __init dccp_v6_init(void)
1233 {
1234         int err = proto_register(&dccp_v6_prot, 1);
1235
1236         if (err != 0)
1237                 goto out;
1238
1239         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1240         if (err != 0)
1241                 goto out_unregister_proto;
1242
1243         inet6_register_protosw(&dccp_v6_protosw);
1244
1245         err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1246                                        SOCK_DCCP, IPPROTO_DCCP);
1247         if (err != 0)
1248                 goto out_unregister_protosw;
1249 out:
1250         return err;
1251 out_unregister_protosw:
1252         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1253         inet6_unregister_protosw(&dccp_v6_protosw);
1254 out_unregister_proto:
1255         proto_unregister(&dccp_v6_prot);
1256         goto out;
1257 }
1258
1259 static void __exit dccp_v6_exit(void)
1260 {
1261         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1262         inet6_unregister_protosw(&dccp_v6_protosw);
1263         proto_unregister(&dccp_v6_prot);
1264 }
1265
1266 module_init(dccp_v6_init);
1267 module_exit(dccp_v6_exit);
1268
1269 /*
1270  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1271  * values directly, Also cover the case where the protocol is not specified,
1272  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1273  */
1274 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1275 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1276 MODULE_LICENSE("GPL");
1277 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1278 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");