git.oblomov.eu Git - linux-2.6/blob - net/dccp/ipv6.c

   1 /*
   2  *      DCCP over IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Based on net/dccp6/ipv6.c
   6  *
   7  *      Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #include <linux/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 /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
  37
  38 static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
  39 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
  40
  41 static void dccp_v6_hash(struct sock *sk)
  42 {
  43         if (sk->sk_state != DCCP_CLOSED) {
  44                 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
  45                         inet_hash(sk);
  46                         return;
  47                 }
  48                 local_bh_disable();
  49                 __inet6_hash(sk);
  50                 local_bh_enable();
  51         }
  52 }
  53
  54 /* add pseudo-header to DCCP checksum stored in skb->csum */
  55 static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
  56                                       struct in6_addr *saddr,
  57                                       struct in6_addr *daddr)
  58 {
  59         return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
  60 }
  61
  62 static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
  63                                       struct sk_buff *skb)
  64 {
  65         struct ipv6_pinfo *np = inet6_sk(sk);
  66         struct dccp_hdr *dh = dccp_hdr(skb);
  67
  68         dccp_csum_outgoing(skb);
  69         dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
  70 }
  71
  72 static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
  73                                                   __be16 sport, __be16 dport   )
  74 {
  75         return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
  76 }
  77
  78 static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
  79 {
  80         return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
  81                                              ipv6_hdr(skb)->saddr.s6_addr32,
  82                                              dccp_hdr(skb)->dccph_dport,
  83                                              dccp_hdr(skb)->dccph_sport     );
  84
  85 }
  86
  87 static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
  88                         int type, int code, int offset, __be32 info)
  89 {
  90         struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
  91         const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
  92         struct ipv6_pinfo *np;
  93         struct sock *sk;
  94         int err;
  95         __u64 seq;
  96
  97         sk = inet6_lookup(dev_net(skb->dev), &dccp_hashinfo,
  98                         &hdr->daddr, dh->dccph_dport,
  99                         &hdr->saddr, dh->dccph_sport, inet6_iif(skb));
 100
 101         if (sk == NULL) {
 102                 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
 103                 return;
 104         }
 105
 106         if (sk->sk_state == DCCP_TIME_WAIT) {
 107                 inet_twsk_put(inet_twsk(sk));
 108                 return;
 109         }
 110
 111         bh_lock_sock(sk);
 112         if (sock_owned_by_user(sk))
 113                 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
 114
 115         if (sk->sk_state == DCCP_CLOSED)
 116                 goto out;
 117
 118         np = inet6_sk(sk);
 119
 120         if (type == ICMPV6_PKT_TOOBIG) {
 121                 struct dst_entry *dst = NULL;
 122
 123                 if (sock_owned_by_user(sk))
 124                         goto out;
 125                 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
 126                         goto out;
 127
 128                 /* icmp should have updated the destination cache entry */
 129                 dst = __sk_dst_check(sk, np->dst_cookie);
 130                 if (dst == NULL) {
 131                         struct inet_sock *inet = inet_sk(sk);
 132                         struct flowi fl;
 133
 134                         /* BUGGG_FUTURE: Again, it is not clear how
 135                            to handle rthdr case. Ignore this complexity
 136                            for now.
 137                          */
 138                         memset(&fl, 0, sizeof(fl));
 139                         fl.proto = IPPROTO_DCCP;
 140                         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 141                         ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 142                         fl.oif = sk->sk_bound_dev_if;
 143                         fl.fl_ip_dport = inet->dport;
 144                         fl.fl_ip_sport = inet->sport;
 145                         security_sk_classify_flow(sk, &fl);
 146
 147                         err = ip6_dst_lookup(sk, &dst, &fl);
 148                         if (err) {
 149                                 sk->sk_err_soft = -err;
 150                                 goto out;
 151                         }
 152
 153                         err = xfrm_lookup(&dst, &fl, sk, 0);
 154                         if (err < 0) {
 155                                 sk->sk_err_soft = -err;
 156                                 goto out;
 157                         }
 158                 } else
 159                         dst_hold(dst);
 160
 161                 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
 162                         dccp_sync_mss(sk, dst_mtu(dst));
 163                 } /* else let the usual retransmit timer handle it */
 164                 dst_release(dst);
 165                 goto out;
 166         }
 167
 168         icmpv6_err_convert(type, code, &err);
 169
 170         seq = dccp_hdr_seq(dh);
 171         /* Might be for an request_sock */
 172         switch (sk->sk_state) {
 173                 struct request_sock *req, **prev;
 174         case DCCP_LISTEN:
 175                 if (sock_owned_by_user(sk))
 176                         goto out;
 177
 178                 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
 179                                            &hdr->daddr, &hdr->saddr,
 180                                            inet6_iif(skb));
 181                 if (req == NULL)
 182                         goto out;
 183
 184                 /*
 185                  * ICMPs are not backlogged, hence we cannot get an established
 186                  * socket here.
 187                  */
 188                 BUG_TRAP(req->sk == NULL);
 189
 190                 if (seq != dccp_rsk(req)->dreq_iss) {
 191                         NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
 192                         goto out;
 193                 }
 194
 195                 inet_csk_reqsk_queue_drop(sk, req, prev);
 196                 goto out;
 197
 198         case DCCP_REQUESTING:
 199         case DCCP_RESPOND:  /* Cannot happen.
 200                                It can, it SYNs are crossed. --ANK */
 201                 if (!sock_owned_by_user(sk)) {
 202                         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 203                         sk->sk_err = err;
 204                         /*
 205                          * Wake people up to see the error
 206                          * (see connect in sock.c)
 207                          */
 208                         sk->sk_error_report(sk);
 209                         dccp_done(sk);
 210                 } else
 211                         sk->sk_err_soft = err;
 212                 goto out;
 213         }
 214
 215         if (!sock_owned_by_user(sk) && np->recverr) {
 216                 sk->sk_err = err;
 217                 sk->sk_error_report(sk);
 218         } else
 219                 sk->sk_err_soft = err;
 220
 221 out:
 222         bh_unlock_sock(sk);
 223         sock_put(sk);
 224 }
 225
 226
 227 static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
 228 {
 229         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 230         struct ipv6_pinfo *np = inet6_sk(sk);
 231         struct sk_buff *skb;
 232         struct ipv6_txoptions *opt = NULL;
 233         struct in6_addr *final_p = NULL, final;
 234         struct flowi fl;
 235         int err = -1;
 236         struct dst_entry *dst;
 237
 238         memset(&fl, 0, sizeof(fl));
 239         fl.proto = IPPROTO_DCCP;
 240         ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 241         ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 242         fl.fl6_flowlabel = 0;
 243         fl.oif = ireq6->iif;
 244         fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 245         fl.fl_ip_sport = inet_sk(sk)->sport;
 246         security_req_classify_flow(req, &fl);
 247
 248         opt = np->opt;
 249
 250         if (opt != NULL && opt->srcrt != NULL) {
 251                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 252
 253                 ipv6_addr_copy(&final, &fl.fl6_dst);
 254                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 255                 final_p = &final;
 256         }
 257
 258         err = ip6_dst_lookup(sk, &dst, &fl);
 259         if (err)
 260                 goto done;
 261
 262         if (final_p)
 263                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 264
 265         err = xfrm_lookup(&dst, &fl, sk, 0);
 266         if (err < 0)
 267                 goto done;
 268
 269         skb = dccp_make_response(sk, dst, req);
 270         if (skb != NULL) {
 271                 struct dccp_hdr *dh = dccp_hdr(skb);
 272
 273                 dh->dccph_checksum = dccp_v6_csum_finish(skb,
 274                                                          &ireq6->loc_addr,
 275                                                          &ireq6->rmt_addr);
 276                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 277                 err = ip6_xmit(sk, skb, &fl, opt, 0);
 278                 err = net_xmit_eval(err);
 279         }
 280
 281 done:
 282         if (opt != NULL && opt != np->opt)
 283                 sock_kfree_s(sk, opt, opt->tot_len);
 284         dst_release(dst);
 285         return err;
 286 }
 287
 288 static void dccp_v6_reqsk_destructor(struct request_sock *req)
 289 {
 290         if (inet6_rsk(req)->pktopts != NULL)
 291                 kfree_skb(inet6_rsk(req)->pktopts);
 292 }
 293
 294 static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
 295 {
 296         struct ipv6hdr *rxip6h;
 297         struct sk_buff *skb;
 298         struct flowi fl;
 299         struct net *net = dev_net(rxskb->dst->dev);
 300         struct sock *ctl_sk = net->dccp.v6_ctl_sk;
 301
 302         if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
 303                 return;
 304
 305         if (!ipv6_unicast_destination(rxskb))
 306                 return;
 307
 308         skb = dccp_ctl_make_reset(ctl_sk, rxskb);
 309         if (skb == NULL)
 310                 return;
 311
 312         rxip6h = ipv6_hdr(rxskb);
 313         dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
 314                                                             &rxip6h->daddr);
 315
 316         memset(&fl, 0, sizeof(fl));
 317         ipv6_addr_copy(&fl.fl6_dst, &rxip6h->saddr);
 318         ipv6_addr_copy(&fl.fl6_src, &rxip6h->daddr);
 319
 320         fl.proto = IPPROTO_DCCP;
 321         fl.oif = inet6_iif(rxskb);
 322         fl.fl_ip_dport = dccp_hdr(skb)->dccph_dport;
 323         fl.fl_ip_sport = dccp_hdr(skb)->dccph_sport;
 324         security_skb_classify_flow(rxskb, &fl);
 325
 326         /* sk = NULL, but it is safe for now. RST socket required. */
 327         if (!ip6_dst_lookup(ctl_sk, &skb->dst, &fl)) {
 328                 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
 329                         ip6_xmit(ctl_sk, skb, &fl, NULL, 0);
 330                         DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
 331                         DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
 332                         return;
 333                 }
 334         }
 335
 336         kfree_skb(skb);
 337 }
 338
 339 static struct request_sock_ops dccp6_request_sock_ops = {
 340         .family         = AF_INET6,
 341         .obj_size       = sizeof(struct dccp6_request_sock),
 342         .rtx_syn_ack    = dccp_v6_send_response,
 343         .send_ack       = dccp_reqsk_send_ack,
 344         .destructor     = dccp_v6_reqsk_destructor,
 345         .send_reset     = dccp_v6_ctl_send_reset,
 346 };
 347
 348 static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
 349 {
 350         const struct dccp_hdr *dh = dccp_hdr(skb);
 351         const struct ipv6hdr *iph = ipv6_hdr(skb);
 352         struct sock *nsk;
 353         struct request_sock **prev;
 354         /* Find possible connection requests. */
 355         struct request_sock *req = inet6_csk_search_req(sk, &prev,
 356                                                         dh->dccph_sport,
 357                                                         &iph->saddr,
 358                                                         &iph->daddr,
 359                                                         inet6_iif(skb));
 360         if (req != NULL)
 361                 return dccp_check_req(sk, skb, req, prev);
 362
 363         nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
 364                                          &iph->saddr, dh->dccph_sport,
 365                                          &iph->daddr, ntohs(dh->dccph_dport),
 366                                          inet6_iif(skb));
 367         if (nsk != NULL) {
 368                 if (nsk->sk_state != DCCP_TIME_WAIT) {
 369                         bh_lock_sock(nsk);
 370                         return nsk;
 371                 }
 372                 inet_twsk_put(inet_twsk(nsk));
 373                 return NULL;
 374         }
 375
 376         return sk;
 377 }
 378
 379 static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 380 {
 381         struct request_sock *req;
 382         struct dccp_request_sock *dreq;
 383         struct inet6_request_sock *ireq6;
 384         struct ipv6_pinfo *np = inet6_sk(sk);
 385         const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
 386         struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
 387
 388         if (skb->protocol == htons(ETH_P_IP))
 389                 return dccp_v4_conn_request(sk, skb);
 390
 391         if (!ipv6_unicast_destination(skb))
 392                 return 0;       /* discard, don't send a reset here */
 393
 394         if (dccp_bad_service_code(sk, service)) {
 395                 dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
 396                 goto drop;
 397         }
 398         /*
 399          * There are no SYN attacks on IPv6, yet...
 400          */
 401         dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 402         if (inet_csk_reqsk_queue_is_full(sk))
 403                 goto drop;
 404
 405         if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 406                 goto drop;
 407
 408         req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
 409         if (req == NULL)
 410                 goto drop;
 411
 412         dccp_reqsk_init(req, skb);
 413
 414         dreq = dccp_rsk(req);
 415         if (dccp_parse_options(sk, dreq, skb))
 416                 goto drop_and_free;
 417
 418         if (security_inet_conn_request(sk, skb, req))
 419                 goto drop_and_free;
 420
 421         ireq6 = inet6_rsk(req);
 422         ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
 423         ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
 424         ireq6->pktopts  = NULL;
 425
 426         if (ipv6_opt_accepted(sk, skb) ||
 427             np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
 428             np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
 429                 atomic_inc(&skb->users);
 430                 ireq6->pktopts = skb;
 431         }
 432         ireq6->iif = sk->sk_bound_dev_if;
 433
 434         /* So that link locals have meaning */
 435         if (!sk->sk_bound_dev_if &&
 436             ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
 437                 ireq6->iif = inet6_iif(skb);
 438
 439         /*
 440          * Step 3: Process LISTEN state
 441          *
 442          *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
 443          *
 444          *   In fact we defer setting S.GSR, S.SWL, S.SWH to
 445          *   dccp_create_openreq_child.
 446          */
 447         dreq->dreq_isr     = dcb->dccpd_seq;
 448         dreq->dreq_iss     = dccp_v6_init_sequence(skb);
 449         dreq->dreq_service = service;
 450
 451         if (dccp_v6_send_response(sk, req))
 452                 goto drop_and_free;
 453
 454         inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
 455         return 0;
 456
 457 drop_and_free:
 458         reqsk_free(req);
 459 drop:
 460         DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
 461         return -1;
 462 }
 463
 464 static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
 465                                               struct sk_buff *skb,
 466                                               struct request_sock *req,
 467                                               struct dst_entry *dst)
 468 {
 469         struct inet6_request_sock *ireq6 = inet6_rsk(req);
 470         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 471         struct inet_sock *newinet;
 472         struct dccp_sock *newdp;
 473         struct dccp6_sock *newdp6;
 474         struct sock *newsk;
 475         struct ipv6_txoptions *opt;
 476
 477         if (skb->protocol == htons(ETH_P_IP)) {
 478                 /*
 479                  *      v6 mapped
 480                  */
 481                 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
 482                 if (newsk == NULL)
 483                         return NULL;
 484
 485                 newdp6 = (struct dccp6_sock *)newsk;
 486                 newdp = dccp_sk(newsk);
 487                 newinet = inet_sk(newsk);
 488                 newinet->pinet6 = &newdp6->inet6;
 489                 newnp = inet6_sk(newsk);
 490
 491                 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 492
 493                 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
 494                               newinet->daddr);
 495
 496                 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
 497                               newinet->saddr);
 498
 499                 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
 500
 501                 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
 502                 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
 503                 newnp->pktoptions  = NULL;
 504                 newnp->opt         = NULL;
 505                 newnp->mcast_oif   = inet6_iif(skb);
 506                 newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
 507
 508                 /*
 509                  * No need to charge this sock to the relevant IPv6 refcnt debug socks count
 510                  * here, dccp_create_openreq_child now does this for us, see the comment in
 511                  * that function for the gory details. -acme
 512                  */
 513
 514                 /* It is tricky place. Until this moment IPv4 tcp
 515                    worked with IPv6 icsk.icsk_af_ops.
 516                    Sync it now.
 517                  */
 518                 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
 519
 520                 return newsk;
 521         }
 522
 523         opt = np->opt;
 524
 525         if (sk_acceptq_is_full(sk))
 526                 goto out_overflow;
 527
 528         if (dst == NULL) {
 529                 struct in6_addr *final_p = NULL, final;
 530                 struct flowi fl;
 531
 532                 memset(&fl, 0, sizeof(fl));
 533                 fl.proto = IPPROTO_DCCP;
 534                 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
 535                 if (opt != NULL && opt->srcrt != NULL) {
 536                         const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 537
 538                         ipv6_addr_copy(&final, &fl.fl6_dst);
 539                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 540                         final_p = &final;
 541                 }
 542                 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
 543                 fl.oif = sk->sk_bound_dev_if;
 544                 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
 545                 fl.fl_ip_sport = inet_sk(sk)->sport;
 546                 security_sk_classify_flow(sk, &fl);
 547
 548                 if (ip6_dst_lookup(sk, &dst, &fl))
 549                         goto out;
 550
 551                 if (final_p)
 552                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 553
 554                 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
 555                         goto out;
 556         }
 557
 558         newsk = dccp_create_openreq_child(sk, req, skb);
 559         if (newsk == NULL)
 560                 goto out;
 561
 562         /*
 563          * No need to charge this sock to the relevant IPv6 refcnt debug socks
 564          * count here, dccp_create_openreq_child now does this for us, see the
 565          * comment in that function for the gory details. -acme
 566          */
 567
 568         __ip6_dst_store(newsk, dst, NULL, NULL);
 569         newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
 570                                                       NETIF_F_TSO);
 571         newdp6 = (struct dccp6_sock *)newsk;
 572         newinet = inet_sk(newsk);
 573         newinet->pinet6 = &newdp6->inet6;
 574         newdp = dccp_sk(newsk);
 575         newnp = inet6_sk(newsk);
 576
 577         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 578
 579         ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
 580         ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
 581         ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
 582         newsk->sk_bound_dev_if = ireq6->iif;
 583
 584         /* Now IPv6 options...
 585
 586            First: no IPv4 options.
 587          */
 588         newinet->opt = NULL;
 589
 590         /* Clone RX bits */
 591         newnp->rxopt.all = np->rxopt.all;
 592
 593         /* Clone pktoptions received with SYN */
 594         newnp->pktoptions = NULL;
 595         if (ireq6->pktopts != NULL) {
 596                 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
 597                 kfree_skb(ireq6->pktopts);
 598                 ireq6->pktopts = NULL;
 599                 if (newnp->pktoptions)
 600                         skb_set_owner_r(newnp->pktoptions, newsk);
 601         }
 602         newnp->opt        = NULL;
 603         newnp->mcast_oif  = inet6_iif(skb);
 604         newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
 605
 606         /*
 607          * Clone native IPv6 options from listening socket (if any)
 608          *
 609          * Yes, keeping reference count would be much more clever, but we make
 610          * one more one thing there: reattach optmem to newsk.
 611          */
 612         if (opt != NULL) {
 613                 newnp->opt = ipv6_dup_options(newsk, opt);
 614                 if (opt != np->opt)
 615                         sock_kfree_s(sk, opt, opt->tot_len);
 616         }
 617
 618         inet_csk(newsk)->icsk_ext_hdr_len = 0;
 619         if (newnp->opt != NULL)
 620                 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
 621                                                      newnp->opt->opt_flen);
 622
 623         dccp_sync_mss(newsk, dst_mtu(dst));
 624
 625         newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
 626
 627         __inet6_hash(newsk);
 628         __inet_inherit_port(sk, newsk);
 629
 630         return newsk;
 631
 632 out_overflow:
 633         NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
 634 out:
 635         NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
 636         if (opt != NULL && opt != np->opt)
 637                 sock_kfree_s(sk, opt, opt->tot_len);
 638         dst_release(dst);
 639         return NULL;
 640 }
 641
 642 /* The socket must have it's spinlock held when we get
 643  * here.
 644  *
 645  * We have a potential double-lock case here, so even when
 646  * doing backlog processing we use the BH locking scheme.
 647  * This is because we cannot sleep with the original spinlock
 648  * held.
 649  */
 650 static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 651 {
 652         struct ipv6_pinfo *np = inet6_sk(sk);
 653         struct sk_buff *opt_skb = NULL;
 654
 655         /* Imagine: socket is IPv6. IPv4 packet arrives,
 656            goes to IPv4 receive handler and backlogged.
 657            From backlog it always goes here. Kerboom...
 658            Fortunately, dccp_rcv_established and rcv_established
 659            handle them correctly, but it is not case with
 660            dccp_v6_hnd_req and dccp_v6_ctl_send_reset().   --ANK
 661          */
 662
 663         if (skb->protocol == htons(ETH_P_IP))
 664                 return dccp_v4_do_rcv(sk, skb);
 665
 666         if (sk_filter(sk, skb))
 667                 goto discard;
 668
 669         /*
 670          * socket locking is here for SMP purposes as backlog rcv is currently
 671          * called with bh processing disabled.
 672          */
 673
 674         /* Do Stevens' IPV6_PKTOPTIONS.
 675
 676            Yes, guys, it is the only place in our code, where we
 677            may make it not affecting IPv4.
 678            The rest of code is protocol independent,
 679            and I do not like idea to uglify IPv4.
 680
 681            Actually, all the idea behind IPV6_PKTOPTIONS
 682            looks not very well thought. For now we latch
 683            options, received in the last packet, enqueued
 684            by tcp. Feel free to propose better solution.
 685                                                --ANK (980728)
 686          */
 687         if (np->rxopt.all)
 688         /*
 689          * FIXME: Add handling of IPV6_PKTOPTIONS skb. See the comments below
 690          *        (wrt ipv6_pktopions) and net/ipv6/tcp_ipv6.c for an example.
 691          */
 692                 opt_skb = skb_clone(skb, GFP_ATOMIC);
 693
 694         if (sk->sk_state == DCCP_OPEN) { /* Fast path */
 695                 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
 696                         goto reset;
 697                 if (opt_skb) {
 698                         /* XXX This is where we would goto ipv6_pktoptions. */
 699                         __kfree_skb(opt_skb);
 700                 }
 701                 return 0;
 702         }
 703
 704         /*
 705          *  Step 3: Process LISTEN state
 706          *     If S.state == LISTEN,
 707          *       If P.type == Request or P contains a valid Init Cookie option,
 708          *            (* Must scan the packet's options to check for Init
 709          *               Cookies.  Only Init Cookies are processed here,
 710          *               however; other options are processed in Step 8.  This
 711          *               scan need only be performed if the endpoint uses Init
 712          *               Cookies *)
 713          *            (* Generate a new socket and switch to that socket *)
 714          *            Set S := new socket for this port pair
 715          *            S.state = RESPOND
 716          *            Choose S.ISS (initial seqno) or set from Init Cookies
 717          *            Initialize S.GAR := S.ISS
 718          *            Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
 719          *            Continue with S.state == RESPOND
 720          *            (* A Response packet will be generated in Step 11 *)
 721          *       Otherwise,
 722          *            Generate Reset(No Connection) unless P.type == Reset
 723          *            Drop packet and return
 724          *
 725          * NOTE: the check for the packet types is done in
 726          *       dccp_rcv_state_process
 727          */
 728         if (sk->sk_state == DCCP_LISTEN) {
 729                 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 730
 731                 if (nsk == NULL)
 732                         goto discard;
 733                 /*
 734                  * Queue it on the new socket if the new socket is active,
 735                  * otherwise we just shortcircuit this and continue with
 736                  * the new socket..
 737                  */
 738                 if (nsk != sk) {
 739                         if (dccp_child_process(sk, nsk, skb))
 740                                 goto reset;
 741                         if (opt_skb != NULL)
 742                                 __kfree_skb(opt_skb);
 743                         return 0;
 744                 }
 745         }
 746
 747         if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
 748                 goto reset;
 749         if (opt_skb) {
 750                 /* XXX This is where we would goto ipv6_pktoptions. */
 751                 __kfree_skb(opt_skb);
 752         }
 753         return 0;
 754
 755 reset:
 756         dccp_v6_ctl_send_reset(sk, skb);
 757 discard:
 758         if (opt_skb != NULL)
 759                 __kfree_skb(opt_skb);
 760         kfree_skb(skb);
 761         return 0;
 762 }
 763
 764 static int dccp_v6_rcv(struct sk_buff *skb)
 765 {
 766         const struct dccp_hdr *dh;
 767         struct sock *sk;
 768         int min_cov;
 769
 770         /* Step 1: Check header basics */
 771
 772         if (dccp_invalid_packet(skb))
 773                 goto discard_it;
 774
 775         /* Step 1: If header checksum is incorrect, drop packet and return. */
 776         if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
 777                                      &ipv6_hdr(skb)->daddr)) {
 778                 DCCP_WARN("dropped packet with invalid checksum\n");
 779                 goto discard_it;
 780         }
 781
 782         dh = dccp_hdr(skb);
 783
 784         DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(dh);
 785         DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
 786
 787         if (dccp_packet_without_ack(skb))
 788                 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
 789         else
 790                 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
 791
 792         /* Step 2:
 793          *      Look up flow ID in table and get corresponding socket */
 794         sk = __inet6_lookup(dev_net(skb->dst->dev), &dccp_hashinfo,
 795                             &ipv6_hdr(skb)->saddr, dh->dccph_sport,
 796                             &ipv6_hdr(skb)->daddr, ntohs(dh->dccph_dport),
 797                             inet6_iif(skb));
 798         /*
 799          * Step 2:
 800          *      If no socket ...
 801          */
 802         if (sk == NULL) {
 803                 dccp_pr_debug("failed to look up flow ID in table and "
 804                               "get corresponding socket\n");
 805                 goto no_dccp_socket;
 806         }
 807
 808         /*
 809          * Step 2:
 810          *      ... or S.state == TIMEWAIT,
 811          *              Generate Reset(No Connection) unless P.type == Reset
 812          *              Drop packet and return
 813          */
 814         if (sk->sk_state == DCCP_TIME_WAIT) {
 815                 dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
 816                 inet_twsk_put(inet_twsk(sk));
 817                 goto no_dccp_socket;
 818         }
 819
 820         /*
 821          * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
 822          *      o if MinCsCov = 0, only packets with CsCov = 0 are accepted
 823          *      o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
 824          */
 825         min_cov = dccp_sk(sk)->dccps_pcrlen;
 826         if (dh->dccph_cscov  &&  (min_cov == 0 || dh->dccph_cscov < min_cov))  {
 827                 dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
 828                               dh->dccph_cscov, min_cov);
 829                 /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
 830                 goto discard_and_relse;
 831         }
 832
 833         if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 834                 goto discard_and_relse;
 835
 836         return sk_receive_skb(sk, skb, 1) ? -1 : 0;
 837
 838 no_dccp_socket:
 839         if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
 840                 goto discard_it;
 841         /*
 842          * Step 2:
 843          *      If no socket ...
 844          *              Generate Reset(No Connection) unless P.type == Reset
 845          *              Drop packet and return
 846          */
 847         if (dh->dccph_type != DCCP_PKT_RESET) {
 848                 DCCP_SKB_CB(skb)->dccpd_reset_code =
 849                                         DCCP_RESET_CODE_NO_CONNECTION;
 850                 dccp_v6_ctl_send_reset(sk, skb);
 851         }
 852
 853 discard_it:
 854         kfree_skb(skb);
 855         return 0;
 856
 857 discard_and_relse:
 858         sock_put(sk);
 859         goto discard_it;
 860 }
 861
 862 static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
 863                            int addr_len)
 864 {
 865         struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
 866         struct inet_connection_sock *icsk = inet_csk(sk);
 867         struct inet_sock *inet = inet_sk(sk);
 868         struct ipv6_pinfo *np = inet6_sk(sk);
 869         struct dccp_sock *dp = dccp_sk(sk);
 870         struct in6_addr *saddr = NULL, *final_p = NULL, final;
 871         struct flowi fl;
 872         struct dst_entry *dst;
 873         int addr_type;
 874         int err;
 875
 876         dp->dccps_role = DCCP_ROLE_CLIENT;
 877
 878         if (addr_len < SIN6_LEN_RFC2133)
 879                 return -EINVAL;
 880
 881         if (usin->sin6_family != AF_INET6)
 882                 return -EAFNOSUPPORT;
 883
 884         memset(&fl, 0, sizeof(fl));
 885
 886         if (np->sndflow) {
 887                 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
 888                 IP6_ECN_flow_init(fl.fl6_flowlabel);
 889                 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
 890                         struct ip6_flowlabel *flowlabel;
 891                         flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
 892                         if (flowlabel == NULL)
 893                                 return -EINVAL;
 894                         ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
 895                         fl6_sock_release(flowlabel);
 896                 }
 897         }
 898         /*
 899          * connect() to INADDR_ANY means loopback (BSD'ism).
 900          */
 901         if (ipv6_addr_any(&usin->sin6_addr))
 902                 usin->sin6_addr.s6_addr[15] = 1;
 903
 904         addr_type = ipv6_addr_type(&usin->sin6_addr);
 905
 906         if (addr_type & IPV6_ADDR_MULTICAST)
 907                 return -ENETUNREACH;
 908
 909         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 910                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 911                     usin->sin6_scope_id) {
 912                         /* If interface is set while binding, indices
 913                          * must coincide.
 914                          */
 915                         if (sk->sk_bound_dev_if &&
 916                             sk->sk_bound_dev_if != usin->sin6_scope_id)
 917                                 return -EINVAL;
 918
 919                         sk->sk_bound_dev_if = usin->sin6_scope_id;
 920                 }
 921
 922                 /* Connect to link-local address requires an interface */
 923                 if (!sk->sk_bound_dev_if)
 924                         return -EINVAL;
 925         }
 926
 927         ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
 928         np->flow_label = fl.fl6_flowlabel;
 929
 930         /*
 931          * DCCP over IPv4
 932          */
 933         if (addr_type == IPV6_ADDR_MAPPED) {
 934                 u32 exthdrlen = icsk->icsk_ext_hdr_len;
 935                 struct sockaddr_in sin;
 936
 937                 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
 938
 939                 if (__ipv6_only_sock(sk))
 940                         return -ENETUNREACH;
 941
 942                 sin.sin_family = AF_INET;
 943                 sin.sin_port = usin->sin6_port;
 944                 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
 945
 946                 icsk->icsk_af_ops = &dccp_ipv6_mapped;
 947                 sk->sk_backlog_rcv = dccp_v4_do_rcv;
 948
 949                 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
 950                 if (err) {
 951                         icsk->icsk_ext_hdr_len = exthdrlen;
 952                         icsk->icsk_af_ops = &dccp_ipv6_af_ops;
 953                         sk->sk_backlog_rcv = dccp_v6_do_rcv;
 954                         goto failure;
 955                 } else {
 956                         ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
 957                                       inet->saddr);
 958                         ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
 959                                       inet->rcv_saddr);
 960                 }
 961
 962                 return err;
 963         }
 964
 965         if (!ipv6_addr_any(&np->rcv_saddr))
 966                 saddr = &np->rcv_saddr;
 967
 968         fl.proto = IPPROTO_DCCP;
 969         ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 970         ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
 971         fl.oif = sk->sk_bound_dev_if;
 972         fl.fl_ip_dport = usin->sin6_port;
 973         fl.fl_ip_sport = inet->sport;
 974         security_sk_classify_flow(sk, &fl);
 975
 976         if (np->opt != NULL && np->opt->srcrt != NULL) {
 977                 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
 978
 979                 ipv6_addr_copy(&final, &fl.fl6_dst);
 980                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 981                 final_p = &final;
 982         }
 983
 984         err = ip6_dst_lookup(sk, &dst, &fl);
 985         if (err)
 986                 goto failure;
 987
 988         if (final_p)
 989                 ipv6_addr_copy(&fl.fl6_dst, final_p);
 990
 991         err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT);
 992         if (err < 0) {
 993                 if (err == -EREMOTE)
 994                         err = ip6_dst_blackhole(sk, &dst, &fl);
 995                 if (err < 0)
 996                         goto failure;
 997         }
 998
 999         if (saddr == NULL) {
1000                 saddr = &fl.fl6_src;
1001                 ipv6_addr_copy(&np->rcv_saddr, saddr);
1002         }
1003
1004         /* set the source address */
1005         ipv6_addr_copy(&np->saddr, saddr);
1006         inet->rcv_saddr = LOOPBACK4_IPV6;
1007
1008         __ip6_dst_store(sk, dst, NULL, NULL);
1009
1010         icsk->icsk_ext_hdr_len = 0;
1011         if (np->opt != NULL)
1012                 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
1013                                           np->opt->opt_nflen);
1014
1015         inet->dport = usin->sin6_port;
1016
1017         dccp_set_state(sk, DCCP_REQUESTING);
1018         err = inet6_hash_connect(&dccp_death_row, sk);
1019         if (err)
1020                 goto late_failure;
1021
1022         dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
1023                                                       np->daddr.s6_addr32,
1024                                                       inet->sport, inet->dport);
1025         err = dccp_connect(sk);
1026         if (err)
1027                 goto late_failure;
1028
1029         return 0;
1030
1031 late_failure:
1032         dccp_set_state(sk, DCCP_CLOSED);
1033         __sk_dst_reset(sk);
1034 failure:
1035         inet->dport = 0;
1036         sk->sk_route_caps = 0;
1037         return err;
1038 }
1039
1040 static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
1041         .queue_xmit        = inet6_csk_xmit,
1042         .send_check        = dccp_v6_send_check,
1043         .rebuild_header    = inet6_sk_rebuild_header,
1044         .conn_request      = dccp_v6_conn_request,
1045         .syn_recv_sock     = dccp_v6_request_recv_sock,
1046         .net_header_len    = sizeof(struct ipv6hdr),
1047         .setsockopt        = ipv6_setsockopt,
1048         .getsockopt        = ipv6_getsockopt,
1049         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1050         .sockaddr_len      = sizeof(struct sockaddr_in6),
1051         .bind_conflict     = inet6_csk_bind_conflict,
1052 #ifdef CONFIG_COMPAT
1053         .compat_setsockopt = compat_ipv6_setsockopt,
1054         .compat_getsockopt = compat_ipv6_getsockopt,
1055 #endif
1056 };
1057
1058 /*
1059  *      DCCP over IPv4 via INET6 API
1060  */
1061 static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
1062         .queue_xmit        = ip_queue_xmit,
1063         .send_check        = dccp_v4_send_check,
1064         .rebuild_header    = inet_sk_rebuild_header,
1065         .conn_request      = dccp_v6_conn_request,
1066         .syn_recv_sock     = dccp_v6_request_recv_sock,
1067         .net_header_len    = sizeof(struct iphdr),
1068         .setsockopt        = ipv6_setsockopt,
1069         .getsockopt        = ipv6_getsockopt,
1070         .addr2sockaddr     = inet6_csk_addr2sockaddr,
1071         .sockaddr_len      = sizeof(struct sockaddr_in6),
1072 #ifdef CONFIG_COMPAT
1073         .compat_setsockopt = compat_ipv6_setsockopt,
1074         .compat_getsockopt = compat_ipv6_getsockopt,
1075 #endif
1076 };
1077
1078 /* NOTE: A lot of things set to zero explicitly by call to
1079  *       sk_alloc() so need not be done here.
1080  */
1081 static int dccp_v6_init_sock(struct sock *sk)
1082 {
1083         static __u8 dccp_v6_ctl_sock_initialized;
1084         int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
1085
1086         if (err == 0) {
1087                 if (unlikely(!dccp_v6_ctl_sock_initialized))
1088                         dccp_v6_ctl_sock_initialized = 1;
1089                 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
1090         }
1091
1092         return err;
1093 }
1094
1095 static int dccp_v6_destroy_sock(struct sock *sk)
1096 {
1097         dccp_destroy_sock(sk);
1098         return inet6_destroy_sock(sk);
1099 }
1100
1101 static struct timewait_sock_ops dccp6_timewait_sock_ops = {
1102         .twsk_obj_size  = sizeof(struct dccp6_timewait_sock),
1103 };
1104
1105 static struct proto dccp_v6_prot = {
1106         .name              = "DCCPv6",
1107         .owner             = THIS_MODULE,
1108         .close             = dccp_close,
1109         .connect           = dccp_v6_connect,
1110         .disconnect        = dccp_disconnect,
1111         .ioctl             = dccp_ioctl,
1112         .init              = dccp_v6_init_sock,
1113         .setsockopt        = dccp_setsockopt,
1114         .getsockopt        = dccp_getsockopt,
1115         .sendmsg           = dccp_sendmsg,
1116         .recvmsg           = dccp_recvmsg,
1117         .backlog_rcv       = dccp_v6_do_rcv,
1118         .hash              = dccp_v6_hash,
1119         .unhash            = inet_unhash,
1120         .accept            = inet_csk_accept,
1121         .get_port          = inet_csk_get_port,
1122         .shutdown          = dccp_shutdown,
1123         .destroy           = dccp_v6_destroy_sock,
1124         .orphan_count      = &dccp_orphan_count,
1125         .max_header        = MAX_DCCP_HEADER,
1126         .obj_size          = sizeof(struct dccp6_sock),
1127         .rsk_prot          = &dccp6_request_sock_ops,
1128         .twsk_prot         = &dccp6_timewait_sock_ops,
1129         .h.hashinfo        = &dccp_hashinfo,
1130 #ifdef CONFIG_COMPAT
1131         .compat_setsockopt = compat_dccp_setsockopt,
1132         .compat_getsockopt = compat_dccp_getsockopt,
1133 #endif
1134 };
1135
1136 static struct inet6_protocol dccp_v6_protocol = {
1137         .handler        = dccp_v6_rcv,
1138         .err_handler    = dccp_v6_err,
1139         .flags          = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1140 };
1141
1142 static struct proto_ops inet6_dccp_ops = {
1143         .family            = PF_INET6,
1144         .owner             = THIS_MODULE,
1145         .release           = inet6_release,
1146         .bind              = inet6_bind,
1147         .connect           = inet_stream_connect,
1148         .socketpair        = sock_no_socketpair,
1149         .accept            = inet_accept,
1150         .getname           = inet6_getname,
1151         .poll              = dccp_poll,
1152         .ioctl             = inet6_ioctl,
1153         .listen            = inet_dccp_listen,
1154         .shutdown          = inet_shutdown,
1155         .setsockopt        = sock_common_setsockopt,
1156         .getsockopt        = sock_common_getsockopt,
1157         .sendmsg           = inet_sendmsg,
1158         .recvmsg           = sock_common_recvmsg,
1159         .mmap              = sock_no_mmap,
1160         .sendpage          = sock_no_sendpage,
1161 #ifdef CONFIG_COMPAT
1162         .compat_setsockopt = compat_sock_common_setsockopt,
1163         .compat_getsockopt = compat_sock_common_getsockopt,
1164 #endif
1165 };
1166
1167 static struct inet_protosw dccp_v6_protosw = {
1168         .type           = SOCK_DCCP,
1169         .protocol       = IPPROTO_DCCP,
1170         .prot           = &dccp_v6_prot,
1171         .ops            = &inet6_dccp_ops,
1172         .capability     = -1,
1173         .flags          = INET_PROTOSW_ICSK,
1174 };
1175
1176 static int dccp_v6_init_net(struct net *net)
1177 {
1178         int err;
1179
1180         err = inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
1181                                    SOCK_DCCP, IPPROTO_DCCP, net);
1182         return err;
1183 }
1184
1185 static void dccp_v6_exit_net(struct net *net)
1186 {
1187         inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
1188 }
1189
1190 static struct pernet_operations dccp_v6_ops = {
1191         .init   = dccp_v6_init_net,
1192         .exit   = dccp_v6_exit_net,
1193 };
1194
1195 static int __init dccp_v6_init(void)
1196 {
1197         int err = proto_register(&dccp_v6_prot, 1);
1198
1199         if (err != 0)
1200                 goto out;
1201
1202         err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1203         if (err != 0)
1204                 goto out_unregister_proto;
1205
1206         inet6_register_protosw(&dccp_v6_protosw);
1207
1208         err = register_pernet_subsys(&dccp_v6_ops);
1209         if (err != 0)
1210                 goto out_destroy_ctl_sock;
1211 out:
1212         return err;
1213
1214 out_destroy_ctl_sock:
1215         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1216         inet6_unregister_protosw(&dccp_v6_protosw);
1217 out_unregister_proto:
1218         proto_unregister(&dccp_v6_prot);
1219         goto out;
1220 }
1221
1222 static void __exit dccp_v6_exit(void)
1223 {
1224         unregister_pernet_subsys(&dccp_v6_ops);
1225         inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1226         inet6_unregister_protosw(&dccp_v6_protosw);
1227         proto_unregister(&dccp_v6_prot);
1228 }
1229
1230 module_init(dccp_v6_init);
1231 module_exit(dccp_v6_exit);
1232
1233 /*
1234  * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1235  * values directly, Also cover the case where the protocol is not specified,
1236  * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1237  */
1238 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
1239 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
1240 MODULE_LICENSE("GPL");
1241 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1242 MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");