11da177e4SLinus Torvalds /* SCTP kernel reference Implementation 21da177e4SLinus Torvalds * (C) Copyright IBM Corp. 2001, 2004 31da177e4SLinus Torvalds * Copyright (c) 1999-2000 Cisco, Inc. 41da177e4SLinus Torvalds * Copyright (c) 1999-2001 Motorola, Inc. 51da177e4SLinus Torvalds * Copyright (c) 2001-2002 Intel Corp. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * This file is part of the SCTP kernel reference Implementation 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * These functions work with the state functions in sctp_sm_statefuns.c 101da177e4SLinus Torvalds * to implement the state operations. These functions implement the 111da177e4SLinus Torvalds * steps which require modifying existing data structures. 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * The SCTP reference implementation is free software; 141da177e4SLinus Torvalds * you can redistribute it and/or modify it under the terms of 151da177e4SLinus Torvalds * the GNU General Public License as published by 161da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 171da177e4SLinus Torvalds * any later version. 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * The SCTP reference implementation is distributed in the hope that it 201da177e4SLinus Torvalds * will be useful, but WITHOUT ANY WARRANTY; without even the implied 211da177e4SLinus Torvalds * ************************ 221da177e4SLinus Torvalds * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 231da177e4SLinus Torvalds * See the GNU General Public License for more details. 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 261da177e4SLinus Torvalds * along with GNU CC; see the file COPYING. If not, write to 271da177e4SLinus Torvalds * the Free Software Foundation, 59 Temple Place - Suite 330, 281da177e4SLinus Torvalds * Boston, MA 02111-1307, USA. 291da177e4SLinus Torvalds * 301da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 311da177e4SLinus Torvalds * email address(es): 321da177e4SLinus Torvalds * lksctp developers <lksctp-developers@lists.sourceforge.net> 331da177e4SLinus Torvalds * 341da177e4SLinus Torvalds * Or submit a bug report through the following website: 351da177e4SLinus Torvalds * http://www.sf.net/projects/lksctp 361da177e4SLinus Torvalds * 371da177e4SLinus Torvalds * Written or modified by: 381da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 391da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 401da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 411da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 421da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 431da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 441da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 451da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 461da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 471da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 481da177e4SLinus Torvalds * 491da177e4SLinus Torvalds * Any bugs reported given to us we will try to fix... any fixes shared will 501da177e4SLinus Torvalds * be incorporated into the next SCTP release. 511da177e4SLinus Torvalds */ 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds #include <linux/types.h> 541da177e4SLinus Torvalds #include <linux/kernel.h> 551da177e4SLinus Torvalds #include <linux/ip.h> 561da177e4SLinus Torvalds #include <linux/ipv6.h> 571da177e4SLinus Torvalds #include <linux/net.h> 581da177e4SLinus Torvalds #include <linux/inet.h> 591da177e4SLinus Torvalds #include <asm/scatterlist.h> 601da177e4SLinus Torvalds #include <linux/crypto.h> 611da177e4SLinus Torvalds #include <net/sock.h> 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds #include <linux/skbuff.h> 641da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 651da177e4SLinus Torvalds #include <net/sctp/sctp.h> 661da177e4SLinus Torvalds #include <net/sctp/sm.h> 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds extern kmem_cache_t *sctp_chunk_cachep; 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds SCTP_STATIC 711da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 721da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen); 731da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 741da177e4SLinus Torvalds const struct sctp_association *asoc, 751da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 761da177e4SLinus Torvalds int *cookie_len, 771da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 781da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 791da177e4SLinus Torvalds union sctp_params param, 801da177e4SLinus Torvalds const union sctp_addr *peer_addr, 813182cd84SAlexey Dobriyan unsigned int __nocast gfp); 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 841da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 851da177e4SLinus Torvalds { 861da177e4SLinus Torvalds struct sctp_af *af; 871da177e4SLinus Torvalds int iif = 0; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds af = sctp_get_af_specific(ipver2af(chunk->skb->nh.iph->version)); 901da177e4SLinus Torvalds if (af) 911da177e4SLinus Torvalds iif = af->skb_iif(chunk->skb); 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds return iif; 941da177e4SLinus Torvalds } 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 971da177e4SLinus Torvalds * 981da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 991da177e4SLinus Torvalds * Explicit Congestion Notification. 1001da177e4SLinus Torvalds */ 1011da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1021da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 1031da177e4SLinus Torvalds __constant_htons(sizeof(struct sctp_paramhdr)), 1041da177e4SLinus Torvalds }; 1051da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1061da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 1071da177e4SLinus Torvalds __constant_htons(sizeof(struct sctp_paramhdr)), 1081da177e4SLinus Torvalds }; 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* A helper to initialize to initialize an op error inside a 1111da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1121da177e4SLinus Torvalds * abort chunk. 1131da177e4SLinus Torvalds */ 1141da177e4SLinus Torvalds void sctp_init_cause(struct sctp_chunk *chunk, __u16 cause_code, 1151da177e4SLinus Torvalds const void *payload, size_t paylen) 1161da177e4SLinus Torvalds { 1171da177e4SLinus Torvalds sctp_errhdr_t err; 1181da177e4SLinus Torvalds int padlen; 1191da177e4SLinus Torvalds __u16 len; 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1221da177e4SLinus Torvalds err.cause = cause_code; 1231da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1241da177e4SLinus Torvalds padlen = len % 4; 1251da177e4SLinus Torvalds err.length = htons(len); 1261da177e4SLinus Torvalds len += padlen; 1271da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1281da177e4SLinus Torvalds chunk->subh.err_hdr = sctp_addto_chunk(chunk, paylen, payload); 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1321da177e4SLinus Torvalds * 1331da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1341da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1351da177e4SLinus Torvalds * 1361da177e4SLinus Torvalds * 0 1 2 3 1371da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 1381da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1391da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1401da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1411da177e4SLinus Torvalds * | Initiate Tag | 1421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1431da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1441da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1451da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1461da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1471da177e4SLinus Torvalds * | Initial TSN | 1481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1491da177e4SLinus Torvalds * \ \ 1501da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1511da177e4SLinus Torvalds * \ \ 1521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1531da177e4SLinus Torvalds * 1541da177e4SLinus Torvalds * 1551da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1561da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1571da177e4SLinus Torvalds * 1581da177e4SLinus Torvalds * Fixed Parameters Status 1591da177e4SLinus Torvalds * ---------------------------------------------- 1601da177e4SLinus Torvalds * Initiate Tag Mandatory 1611da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 1621da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 1631da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 1641da177e4SLinus Torvalds * Initial TSN Mandatory 1651da177e4SLinus Torvalds * 1661da177e4SLinus Torvalds * Variable Parameters Status Type Value 1671da177e4SLinus Torvalds * ------------------------------------------------------------- 1681da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 1691da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 1701da177e4SLinus Torvalds * Cookie Preservative Optional 9 1711da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 1721da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 1731da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 1741da177e4SLinus Torvalds */ 1751da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 1761da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 1773182cd84SAlexey Dobriyan unsigned int __nocast gfp, int vparam_len) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds sctp_inithdr_t init; 1801da177e4SLinus Torvalds union sctp_params addrs; 1811da177e4SLinus Torvalds size_t chunksize; 1821da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 1831da177e4SLinus Torvalds int num_types, addrs_len = 0; 1841da177e4SLinus Torvalds struct sctp_sock *sp; 1851da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 1861da177e4SLinus Torvalds __u16 types[2]; 1871da177e4SLinus Torvalds sctp_adaption_ind_param_t aiparam; 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1901da177e4SLinus Torvalds * 1911da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 1921da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 1931da177e4SLinus Torvalds */ 1941da177e4SLinus Torvalds retval = NULL; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 1971da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2001da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2011da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2021da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2031da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds /* How many address types are needed? */ 2061da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2071da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types); 2101da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2111da177e4SLinus Torvalds if (sctp_prsctp_enable) 2121da177e4SLinus Torvalds chunksize += sizeof(prsctp_param); 2131da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2141da177e4SLinus Torvalds chunksize += vparam_len; 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2171da177e4SLinus Torvalds * 2181da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 2191da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 2201da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 2211da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 2221da177e4SLinus Torvalds * other address types if the Host Name address parameter is 2231da177e4SLinus Torvalds * present in the received INIT chunk. 2241da177e4SLinus Torvalds * 2251da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 2261da177e4SLinus Torvalds */ 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize); 2291da177e4SLinus Torvalds if (!retval) 2301da177e4SLinus Torvalds goto nodata; 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds retval->subh.init_hdr = 2331da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 2341da177e4SLinus Torvalds retval->param_hdr.v = 2351da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2381da177e4SLinus Torvalds * 2391da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 2401da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 2411da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 2421da177e4SLinus Torvalds * support any address type. 2431da177e4SLinus Torvalds */ 2441da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 2451da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 2461da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 2471da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 2501da177e4SLinus Torvalds if (sctp_prsctp_enable) 2511da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 2521da177e4SLinus Torvalds aiparam.param_hdr.type = SCTP_PARAM_ADAPTION_LAYER_IND; 2531da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 2541da177e4SLinus Torvalds aiparam.adaption_ind = htonl(sp->adaption_ind); 2551da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 2561da177e4SLinus Torvalds nodata: 2571da177e4SLinus Torvalds if (addrs.v) 2581da177e4SLinus Torvalds kfree(addrs.v); 2591da177e4SLinus Torvalds return retval; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 2631da177e4SLinus Torvalds const struct sctp_chunk *chunk, 2643182cd84SAlexey Dobriyan unsigned int __nocast gfp, int unkparam_len) 2651da177e4SLinus Torvalds { 2661da177e4SLinus Torvalds sctp_inithdr_t initack; 2671da177e4SLinus Torvalds struct sctp_chunk *retval; 2681da177e4SLinus Torvalds union sctp_params addrs; 2691da177e4SLinus Torvalds int addrs_len; 2701da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 2711da177e4SLinus Torvalds int cookie_len; 2721da177e4SLinus Torvalds size_t chunksize; 2731da177e4SLinus Torvalds sctp_adaption_ind_param_t aiparam; 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds retval = NULL; 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 2781da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 2811da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 2821da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2831da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2841da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 2871da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 2881da177e4SLinus Torvalds */ 2891da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 2901da177e4SLinus Torvalds addrs.v, addrs_len); 2911da177e4SLinus Torvalds if (!cookie) 2921da177e4SLinus Torvalds goto nomem_cookie; 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 2951da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 2961da177e4SLinus Torvalds */ 2971da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 3001da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 3011da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds /* Tell peer that we'll do PR-SCTP only if peer advertised. */ 3041da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 3051da177e4SLinus Torvalds chunksize += sizeof(prsctp_param); 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds chunksize += sizeof(aiparam); 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 3101da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize); 3111da177e4SLinus Torvalds if (!retval) 3121da177e4SLinus Torvalds goto nomem_chunk; 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds /* Per the advice in RFC 2960 6.4, send this reply to 3151da177e4SLinus Torvalds * the source of the INIT packet. 3161da177e4SLinus Torvalds */ 3171da177e4SLinus Torvalds retval->transport = chunk->transport; 3181da177e4SLinus Torvalds retval->subh.init_hdr = 3191da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 3201da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 3211da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 3221da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 3231da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 3241da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 3251da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds aiparam.param_hdr.type = SCTP_PARAM_ADAPTION_LAYER_IND; 3281da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3291da177e4SLinus Torvalds aiparam.adaption_ind = htonl(sctp_sk(asoc->base.sk)->adaption_ind); 3301da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 3331da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 3361da177e4SLinus Torvalds * 3371da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 3381da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 3391da177e4SLinus Torvalds * address from which it received the DATA or control chunk 3401da177e4SLinus Torvalds * to which it is replying. 3411da177e4SLinus Torvalds * 3421da177e4SLinus Torvalds * [INIT ACK back to where the INIT came from.] 3431da177e4SLinus Torvalds */ 3441da177e4SLinus Torvalds if (chunk) 3451da177e4SLinus Torvalds retval->transport = chunk->transport; 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds nomem_chunk: 3481da177e4SLinus Torvalds kfree(cookie); 3491da177e4SLinus Torvalds nomem_cookie: 3501da177e4SLinus Torvalds if (addrs.v) 3511da177e4SLinus Torvalds kfree(addrs.v); 3521da177e4SLinus Torvalds return retval; 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 3561da177e4SLinus Torvalds * 3571da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 3581da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 3591da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 3601da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 3611da177e4SLinus Torvalds * chunks in the same packet. 3621da177e4SLinus Torvalds * 3631da177e4SLinus Torvalds * 0 1 2 3 3641da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 3651da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3661da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 3671da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3681da177e4SLinus Torvalds * / Cookie / 3691da177e4SLinus Torvalds * \ \ 3701da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3711da177e4SLinus Torvalds * 3721da177e4SLinus Torvalds * Chunk Flags: 8 bit 3731da177e4SLinus Torvalds * 3741da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 3751da177e4SLinus Torvalds * 3761da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 3771da177e4SLinus Torvalds * 3781da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 3791da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 3801da177e4SLinus Torvalds * 3811da177e4SLinus Torvalds * Cookie: variable size 3821da177e4SLinus Torvalds * 3831da177e4SLinus Torvalds * This field must contain the exact cookie received in the 3841da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 3851da177e4SLinus Torvalds * 3861da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 3871da177e4SLinus Torvalds * to insure interoperability. 3881da177e4SLinus Torvalds */ 3891da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 3901da177e4SLinus Torvalds const struct sctp_chunk *chunk) 3911da177e4SLinus Torvalds { 3921da177e4SLinus Torvalds struct sctp_chunk *retval; 3931da177e4SLinus Torvalds void *cookie; 3941da177e4SLinus Torvalds int cookie_len; 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds cookie = asoc->peer.cookie; 3971da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 4001da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); 4011da177e4SLinus Torvalds if (!retval) 4021da177e4SLinus Torvalds goto nodata; 4031da177e4SLinus Torvalds retval->subh.cookie_hdr = 4041da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 4071da177e4SLinus Torvalds * 4081da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 4091da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 4101da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 4111da177e4SLinus Torvalds * to which it is replying. 4121da177e4SLinus Torvalds * 4131da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 4141da177e4SLinus Torvalds */ 4151da177e4SLinus Torvalds if (chunk) 4161da177e4SLinus Torvalds retval->transport = chunk->transport; 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds nodata: 4191da177e4SLinus Torvalds return retval; 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 4231da177e4SLinus Torvalds * 4241da177e4SLinus Torvalds * This chunk is used only during the initialization of an 4251da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 4261da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 4271da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 4281da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 4291da177e4SLinus Torvalds * 4301da177e4SLinus Torvalds * 0 1 2 3 4311da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 4321da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4331da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 4341da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4351da177e4SLinus Torvalds * 4361da177e4SLinus Torvalds * Chunk Flags: 8 bits 4371da177e4SLinus Torvalds * 4381da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 4391da177e4SLinus Torvalds */ 4401da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 4411da177e4SLinus Torvalds const struct sctp_chunk *chunk) 4421da177e4SLinus Torvalds { 4431da177e4SLinus Torvalds struct sctp_chunk *retval; 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0); 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 4481da177e4SLinus Torvalds * 4491da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 4501da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 4511da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 4521da177e4SLinus Torvalds * to which it is replying. 4531da177e4SLinus Torvalds * 4541da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 4551da177e4SLinus Torvalds */ 4561da177e4SLinus Torvalds if (retval && chunk) 4571da177e4SLinus Torvalds retval->transport = chunk->transport; 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds return retval; 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds /* 4631da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 4641da177e4SLinus Torvalds * CWR: 4651da177e4SLinus Torvalds * 4661da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 4671da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 4681da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 4691da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 4701da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 4711da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 4721da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 4731da177e4SLinus Torvalds * CE bit. 4741da177e4SLinus Torvalds * 4751da177e4SLinus Torvalds * 0 1 2 3 4761da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 4771da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4781da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 4791da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4801da177e4SLinus Torvalds * | Lowest TSN Number | 4811da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4821da177e4SLinus Torvalds * 4831da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 4841da177e4SLinus Torvalds */ 4851da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 4861da177e4SLinus Torvalds const __u32 lowest_tsn, 4871da177e4SLinus Torvalds const struct sctp_chunk *chunk) 4881da177e4SLinus Torvalds { 4891da177e4SLinus Torvalds struct sctp_chunk *retval; 4901da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 4931da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0, 4941da177e4SLinus Torvalds sizeof(sctp_cwrhdr_t)); 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds if (!retval) 4971da177e4SLinus Torvalds goto nodata; 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 5001da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5031da177e4SLinus Torvalds * 5041da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5051da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5061da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5071da177e4SLinus Torvalds * to which it is replying. 5081da177e4SLinus Torvalds * 5091da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 5101da177e4SLinus Torvalds * came from.] 5111da177e4SLinus Torvalds */ 5121da177e4SLinus Torvalds if (chunk) 5131da177e4SLinus Torvalds retval->transport = chunk->transport; 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds nodata: 5161da177e4SLinus Torvalds return retval; 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 5201da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 5211da177e4SLinus Torvalds const __u32 lowest_tsn) 5221da177e4SLinus Torvalds { 5231da177e4SLinus Torvalds struct sctp_chunk *retval; 5241da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 5271da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0, 5281da177e4SLinus Torvalds sizeof(sctp_ecnehdr_t)); 5291da177e4SLinus Torvalds if (!retval) 5301da177e4SLinus Torvalds goto nodata; 5311da177e4SLinus Torvalds retval->subh.ecne_hdr = 5321da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds nodata: 5351da177e4SLinus Torvalds return retval; 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 5391da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 5401da177e4SLinus Torvalds */ 5411da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 5421da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 5431da177e4SLinus Torvalds int data_len, __u8 flags, __u16 ssn) 5441da177e4SLinus Torvalds { 5451da177e4SLinus Torvalds struct sctp_chunk *retval; 5461da177e4SLinus Torvalds struct sctp_datahdr dp; 5471da177e4SLinus Torvalds int chunk_len; 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 5501da177e4SLinus Torvalds * creating the chunk. 5511da177e4SLinus Torvalds */ 5521da177e4SLinus Torvalds dp.tsn = 0; 5531da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 5541da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 5571da177e4SLinus Torvalds if (sinfo->sinfo_flags & MSG_UNORDERED) { 5581da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 5591da177e4SLinus Torvalds dp.ssn = 0; 5601da177e4SLinus Torvalds } else 5611da177e4SLinus Torvalds dp.ssn = htons(ssn); 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 5641da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len); 5651da177e4SLinus Torvalds if (!retval) 5661da177e4SLinus Torvalds goto nodata; 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 5691da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds nodata: 5721da177e4SLinus Torvalds return retval; 5731da177e4SLinus Torvalds } 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 5761da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 5771da177e4SLinus Torvalds * including duplicates and gaps. 5781da177e4SLinus Torvalds */ 5791da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 5801da177e4SLinus Torvalds { 5811da177e4SLinus Torvalds struct sctp_chunk *retval; 5821da177e4SLinus Torvalds struct sctp_sackhdr sack; 5831da177e4SLinus Torvalds int len; 5841da177e4SLinus Torvalds __u32 ctsn; 5851da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 5861da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 5871da177e4SLinus Torvalds 5881da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 5891da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn); 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 5921da177e4SLinus Torvalds num_gabs = sctp_tsnmap_num_gabs(map); 5931da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds /* Initialize the SACK header. */ 5961da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 5971da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 5981da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 5991da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds len = sizeof(sack) 6021da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 6031da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds /* Create the chunk. */ 6061da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len); 6071da177e4SLinus Torvalds if (!retval) 6081da177e4SLinus Torvalds goto nodata; 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6111da177e4SLinus Torvalds * 6121da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6131da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 6141da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 6151da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 6161da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 6171da177e4SLinus Torvalds * reply chunk. 6181da177e4SLinus Torvalds * 6191da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 6201da177e4SLinus Torvalds * in packets from different source addresses in a single 6211da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 6221da177e4SLinus Torvalds * destination transport addresses from which the DATA or 6231da177e4SLinus Torvalds * control chunks being acknowledged were received. 6241da177e4SLinus Torvalds * 6251da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 6261da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 6271da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 6281da177e4SLinus Torvalds * duplicates. --piggy] 6291da177e4SLinus Torvalds * 6301da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 6311da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 6321da177e4SLinus Torvalds * destination address and not use the source address of the 6331da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 6341da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 6351da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 6361da177e4SLinus Torvalds * for the SACK is broken. 6371da177e4SLinus Torvalds * 6381da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 6391da177e4SLinus Torvalds */ 6401da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds retval->subh.sack_hdr = 6431da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds /* Add the gap ack block information. */ 6461da177e4SLinus Torvalds if (num_gabs) 6471da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 6481da177e4SLinus Torvalds sctp_tsnmap_get_gabs(map)); 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 6511da177e4SLinus Torvalds if (num_dup_tsns) 6521da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 6531da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds nodata: 6561da177e4SLinus Torvalds return retval; 6571da177e4SLinus Torvalds } 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 6601da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 6611da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6621da177e4SLinus Torvalds { 6631da177e4SLinus Torvalds struct sctp_chunk *retval; 6641da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 6651da177e4SLinus Torvalds __u32 ctsn; 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 6681da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0, 6711da177e4SLinus Torvalds sizeof(sctp_shutdownhdr_t)); 6721da177e4SLinus Torvalds if (!retval) 6731da177e4SLinus Torvalds goto nodata; 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds retval->subh.shutdown_hdr = 6761da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds if (chunk) 6791da177e4SLinus Torvalds retval->transport = chunk->transport; 6801da177e4SLinus Torvalds nodata: 6811da177e4SLinus Torvalds return retval; 6821da177e4SLinus Torvalds } 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 6851da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6861da177e4SLinus Torvalds { 6871da177e4SLinus Torvalds struct sctp_chunk *retval; 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6921da177e4SLinus Torvalds * 6931da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6941da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6951da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6961da177e4SLinus Torvalds * to which it is replying. 6971da177e4SLinus Torvalds * 6981da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 6991da177e4SLinus Torvalds */ 7001da177e4SLinus Torvalds if (retval && chunk) 7011da177e4SLinus Torvalds retval->transport = chunk->transport; 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds return retval; 7041da177e4SLinus Torvalds } 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 7071da177e4SLinus Torvalds const struct sctp_association *asoc, 7081da177e4SLinus Torvalds const struct sctp_chunk *chunk) 7091da177e4SLinus Torvalds { 7101da177e4SLinus Torvalds struct sctp_chunk *retval; 7111da177e4SLinus Torvalds __u8 flags = 0; 7121da177e4SLinus Torvalds 713047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 714047a2428SJerome Forissier * reflected) 715047a2428SJerome Forissier */ 7161da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7211da177e4SLinus Torvalds * 7221da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7231da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 7241da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 7251da177e4SLinus Torvalds * to which it is replying. 7261da177e4SLinus Torvalds * 7271da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 7281da177e4SLinus Torvalds * came from.] 7291da177e4SLinus Torvalds */ 7301da177e4SLinus Torvalds if (retval && chunk) 7311da177e4SLinus Torvalds retval->transport = chunk->transport; 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds return retval; 7341da177e4SLinus Torvalds } 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 737047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 7381da177e4SLinus Torvalds */ 7391da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 7401da177e4SLinus Torvalds const struct sctp_chunk *chunk, 7411da177e4SLinus Torvalds const size_t hint) 7421da177e4SLinus Torvalds { 7431da177e4SLinus Torvalds struct sctp_chunk *retval; 7441da177e4SLinus Torvalds __u8 flags = 0; 7451da177e4SLinus Torvalds 746047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 747047a2428SJerome Forissier * an INIT (vtag will be reflected). 748047a2428SJerome Forissier */ 749047a2428SJerome Forissier if (!asoc) { 750047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 751047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 752047a2428SJerome Forissier flags = 0; 753047a2428SJerome Forissier else 754047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 755047a2428SJerome Forissier } 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint); 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7601da177e4SLinus Torvalds * 7611da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7621da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 7631da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 7641da177e4SLinus Torvalds * to which it is replying. 7651da177e4SLinus Torvalds * 7661da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 7671da177e4SLinus Torvalds */ 7681da177e4SLinus Torvalds if (retval && chunk) 7691da177e4SLinus Torvalds retval->transport = chunk->transport; 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds return retval; 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 7751da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 7761da177e4SLinus Torvalds const struct sctp_association *asoc, 7771da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 7781da177e4SLinus Torvalds { 7791da177e4SLinus Torvalds struct sctp_chunk *retval; 7801da177e4SLinus Torvalds __u32 payload; 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 7831da177e4SLinus Torvalds + sizeof(tsn)); 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds if (!retval) 7861da177e4SLinus Torvalds goto no_mem; 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 7891da177e4SLinus Torvalds payload = htonl(tsn); 7901da177e4SLinus Torvalds sctp_init_cause(retval, SCTP_ERROR_NO_DATA, (const void *)&payload, 7911da177e4SLinus Torvalds sizeof(payload)); 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7941da177e4SLinus Torvalds * 7951da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7961da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 7971da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 7981da177e4SLinus Torvalds * to which it is replying. 7991da177e4SLinus Torvalds * 8001da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 8011da177e4SLinus Torvalds */ 8021da177e4SLinus Torvalds if (chunk) 8031da177e4SLinus Torvalds retval->transport = chunk->transport; 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvalds no_mem: 8061da177e4SLinus Torvalds return retval; 8071da177e4SLinus Torvalds } 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 8101da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 8111da177e4SLinus Torvalds const struct sctp_chunk *chunk, 8121da177e4SLinus Torvalds const struct msghdr *msg) 8131da177e4SLinus Torvalds { 8141da177e4SLinus Torvalds struct sctp_chunk *retval; 8151da177e4SLinus Torvalds void *payload = NULL, *payoff; 8161da177e4SLinus Torvalds size_t paylen = 0; 8171da177e4SLinus Torvalds struct iovec *iov = NULL; 8181da177e4SLinus Torvalds int iovlen = 0; 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds if (msg) { 8211da177e4SLinus Torvalds iov = msg->msg_iov; 8221da177e4SLinus Torvalds iovlen = msg->msg_iovlen; 8231da177e4SLinus Torvalds paylen = get_user_iov_size(iov, iovlen); 8241da177e4SLinus Torvalds } 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen); 8271da177e4SLinus Torvalds if (!retval) 8281da177e4SLinus Torvalds goto err_chunk; 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds if (paylen) { 8311da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 8321da177e4SLinus Torvalds payload = kmalloc(paylen, GFP_ATOMIC); 8331da177e4SLinus Torvalds if (!payload) 8341da177e4SLinus Torvalds goto err_payload; 8351da177e4SLinus Torvalds payoff = payload; 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds for (; iovlen > 0; --iovlen) { 8381da177e4SLinus Torvalds if (copy_from_user(payoff, iov->iov_base,iov->iov_len)) 8391da177e4SLinus Torvalds goto err_copy; 8401da177e4SLinus Torvalds payoff += iov->iov_len; 8411da177e4SLinus Torvalds iov++; 8421da177e4SLinus Torvalds } 8431da177e4SLinus Torvalds } 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, payload, paylen); 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds if (paylen) 8481da177e4SLinus Torvalds kfree(payload); 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds return retval; 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds err_copy: 8531da177e4SLinus Torvalds kfree(payload); 8541da177e4SLinus Torvalds err_payload: 8551da177e4SLinus Torvalds sctp_chunk_free(retval); 8561da177e4SLinus Torvalds retval = NULL; 8571da177e4SLinus Torvalds err_chunk: 8581da177e4SLinus Torvalds return retval; 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 8621da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 8631da177e4SLinus Torvalds const struct sctp_association *asoc, 8641da177e4SLinus Torvalds const struct sctp_chunk *chunk, 8651da177e4SLinus Torvalds const __u8 *payload, 8661da177e4SLinus Torvalds const size_t paylen) 8671da177e4SLinus Torvalds { 8681da177e4SLinus Torvalds struct sctp_chunk *retval; 8691da177e4SLinus Torvalds struct sctp_paramhdr phdr; 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 8721da177e4SLinus Torvalds + sizeof(sctp_chunkhdr_t)); 8731da177e4SLinus Torvalds if (!retval) 8741da177e4SLinus Torvalds goto end; 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, payload, paylen); 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 8791da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 8801da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sctp_paramhdr_t), &phdr); 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds end: 8831da177e4SLinus Torvalds return retval; 8841da177e4SLinus Torvalds } 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 8871da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 8881da177e4SLinus Torvalds const struct sctp_transport *transport, 8891da177e4SLinus Torvalds const void *payload, const size_t paylen) 8901da177e4SLinus Torvalds { 8911da177e4SLinus Torvalds struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 8921da177e4SLinus Torvalds 0, paylen); 8931da177e4SLinus Torvalds 8941da177e4SLinus Torvalds if (!retval) 8951da177e4SLinus Torvalds goto nodata; 8961da177e4SLinus Torvalds 8971da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 8981da177e4SLinus Torvalds * what transport it belongs to. 8991da177e4SLinus Torvalds */ 9001da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 9011da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds nodata: 9041da177e4SLinus Torvalds return retval; 9051da177e4SLinus Torvalds } 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 9081da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9091da177e4SLinus Torvalds const void *payload, const size_t paylen) 9101da177e4SLinus Torvalds { 9111da177e4SLinus Torvalds struct sctp_chunk *retval; 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); 9141da177e4SLinus Torvalds if (!retval) 9151da177e4SLinus Torvalds goto nodata; 9161da177e4SLinus Torvalds 9171da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9201da177e4SLinus Torvalds * 9211da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9221da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9231da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9241da177e4SLinus Torvalds * to which it is replying. 9251da177e4SLinus Torvalds * 9261da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 9271da177e4SLinus Torvalds */ 9281da177e4SLinus Torvalds if (chunk) 9291da177e4SLinus Torvalds retval->transport = chunk->transport; 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds nodata: 9321da177e4SLinus Torvalds return retval; 9331da177e4SLinus Torvalds } 9341da177e4SLinus Torvalds 9351da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 9361da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 9371da177e4SLinus Torvalds */ 9381da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 9391da177e4SLinus Torvalds const struct sctp_association *asoc, 9401da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9411da177e4SLinus Torvalds size_t size) 9421da177e4SLinus Torvalds { 9431da177e4SLinus Torvalds struct sctp_chunk *retval; 9441da177e4SLinus Torvalds 9451da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0, 9461da177e4SLinus Torvalds sizeof(sctp_errhdr_t) + size); 9471da177e4SLinus Torvalds if (!retval) 9481da177e4SLinus Torvalds goto nodata; 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9511da177e4SLinus Torvalds * 9521da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9531da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 9541da177e4SLinus Torvalds * address from which it received the DATA or control chunk 9551da177e4SLinus Torvalds * to which it is replying. 9561da177e4SLinus Torvalds * 9571da177e4SLinus Torvalds */ 9581da177e4SLinus Torvalds if (chunk) 9591da177e4SLinus Torvalds retval->transport = chunk->transport; 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds nodata: 9621da177e4SLinus Torvalds return retval; 9631da177e4SLinus Torvalds } 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 9661da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 9671da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9681da177e4SLinus Torvalds __u16 cause_code, const void *payload, 9691da177e4SLinus Torvalds size_t paylen) 9701da177e4SLinus Torvalds { 9711da177e4SLinus Torvalds struct sctp_chunk *retval; 9721da177e4SLinus Torvalds 9731da177e4SLinus Torvalds retval = sctp_make_op_error_space(asoc, chunk, paylen); 9741da177e4SLinus Torvalds if (!retval) 9751da177e4SLinus Torvalds goto nodata; 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds sctp_init_cause(retval, cause_code, payload, paylen); 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds nodata: 9801da177e4SLinus Torvalds return retval; 9811da177e4SLinus Torvalds } 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds /******************************************************************** 9841da177e4SLinus Torvalds * 2nd Level Abstractions 9851da177e4SLinus Torvalds ********************************************************************/ 9861da177e4SLinus Torvalds 9871da177e4SLinus Torvalds /* Turn an skb into a chunk. 9881da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 9891da177e4SLinus Torvalds */ 9901da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 9911da177e4SLinus Torvalds const struct sctp_association *asoc, 9921da177e4SLinus Torvalds struct sock *sk) 9931da177e4SLinus Torvalds { 9941da177e4SLinus Torvalds struct sctp_chunk *retval; 9951da177e4SLinus Torvalds 9961da177e4SLinus Torvalds retval = kmem_cache_alloc(sctp_chunk_cachep, SLAB_ATOMIC); 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds if (!retval) 9991da177e4SLinus Torvalds goto nodata; 10001da177e4SLinus Torvalds memset(retval, 0, sizeof(struct sctp_chunk)); 10011da177e4SLinus Torvalds 10021da177e4SLinus Torvalds if (!sk) { 10031da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb); 10041da177e4SLinus Torvalds } 10051da177e4SLinus Torvalds 100679af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 10071da177e4SLinus Torvalds retval->skb = skb; 10081da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 10091da177e4SLinus Torvalds retval->resent = 0; 10101da177e4SLinus Torvalds retval->has_tsn = 0; 10111da177e4SLinus Torvalds retval->has_ssn = 0; 10121da177e4SLinus Torvalds retval->rtt_in_progress = 0; 10131da177e4SLinus Torvalds retval->sent_at = 0; 10141da177e4SLinus Torvalds retval->singleton = 1; 10151da177e4SLinus Torvalds retval->end_of_packet = 0; 10161da177e4SLinus Torvalds retval->ecn_ce_done = 0; 10171da177e4SLinus Torvalds retval->pdiscard = 0; 10181da177e4SLinus Torvalds 10191da177e4SLinus Torvalds /* sctpimpguide-05.txt Section 2.8.2 10201da177e4SLinus Torvalds * M1) Each time a new DATA chunk is transmitted 10211da177e4SLinus Torvalds * set the 'TSN.Missing.Report' count for that TSN to 0. The 10221da177e4SLinus Torvalds * 'TSN.Missing.Report' count will be used to determine missing chunks 10231da177e4SLinus Torvalds * and when to fast retransmit. 10241da177e4SLinus Torvalds */ 10251da177e4SLinus Torvalds retval->tsn_missing_report = 0; 10261da177e4SLinus Torvalds retval->tsn_gap_acked = 0; 10271da177e4SLinus Torvalds retval->fast_retransmit = 0; 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds /* If this is a fragmented message, track all fragments 10301da177e4SLinus Torvalds * of the message (for SEND_FAILED). 10311da177e4SLinus Torvalds */ 10321da177e4SLinus Torvalds retval->msg = NULL; 10331da177e4SLinus Torvalds 10341da177e4SLinus Torvalds /* Polish the bead hole. */ 10351da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 10361da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 10371da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 10381da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 10391da177e4SLinus Torvalds 10401da177e4SLinus Torvalds nodata: 10411da177e4SLinus Torvalds return retval; 10421da177e4SLinus Torvalds } 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 10451da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 10461da177e4SLinus Torvalds union sctp_addr *dest) 10471da177e4SLinus Torvalds { 10481da177e4SLinus Torvalds memcpy(&chunk->source, src, sizeof(union sctp_addr)); 10491da177e4SLinus Torvalds memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 10501da177e4SLinus Torvalds } 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 10531da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 10541da177e4SLinus Torvalds { 10551da177e4SLinus Torvalds /* If we have a known transport, use that. */ 10561da177e4SLinus Torvalds if (chunk->transport) { 10571da177e4SLinus Torvalds return &chunk->transport->ipaddr; 10581da177e4SLinus Torvalds } else { 10591da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 10601da177e4SLinus Torvalds return &chunk->source; 10611da177e4SLinus Torvalds } 10621da177e4SLinus Torvalds } 10631da177e4SLinus Torvalds 10641da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 10651da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 10661da177e4SLinus Torvalds */ 10671da177e4SLinus Torvalds SCTP_STATIC 10681da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 10691da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen) 10701da177e4SLinus Torvalds { 10711da177e4SLinus Torvalds struct sctp_chunk *retval; 10721da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 10731da177e4SLinus Torvalds struct sk_buff *skb; 10741da177e4SLinus Torvalds struct sock *sk; 10751da177e4SLinus Torvalds 10761da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 10771da177e4SLinus Torvalds skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), 10781da177e4SLinus Torvalds GFP_ATOMIC); 10791da177e4SLinus Torvalds if (!skb) 10801da177e4SLinus Torvalds goto nodata; 10811da177e4SLinus Torvalds 10821da177e4SLinus Torvalds /* Make room for the chunk header. */ 10831da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 10841da177e4SLinus Torvalds chunk_hdr->type = type; 10851da177e4SLinus Torvalds chunk_hdr->flags = flags; 10861da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 10871da177e4SLinus Torvalds 10881da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 10891da177e4SLinus Torvalds retval = sctp_chunkify(skb, asoc, sk); 10901da177e4SLinus Torvalds if (!retval) { 10911da177e4SLinus Torvalds kfree_skb(skb); 10921da177e4SLinus Torvalds goto nodata; 10931da177e4SLinus Torvalds } 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 10961da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 10971da177e4SLinus Torvalds 10981da177e4SLinus Torvalds /* Set the skb to the belonging sock for accounting. */ 10991da177e4SLinus Torvalds skb->sk = sk; 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds return retval; 11021da177e4SLinus Torvalds nodata: 11031da177e4SLinus Torvalds return NULL; 11041da177e4SLinus Torvalds } 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds 11071da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 11081da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 11091da177e4SLinus Torvalds { 11101da177e4SLinus Torvalds /* Free the chunk skb data and the SCTP_chunk stub itself. */ 11111da177e4SLinus Torvalds dev_kfree_skb(chunk->skb); 11121da177e4SLinus Torvalds 11131da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 11141da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 11151da177e4SLinus Torvalds } 11161da177e4SLinus Torvalds 11171da177e4SLinus Torvalds /* Possibly, free the chunk. */ 11181da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 11191da177e4SLinus Torvalds { 112079af02c2SDavid S. Miller BUG_ON(!list_empty(&chunk->list)); 11211da177e4SLinus Torvalds list_del_init(&chunk->transmitted_list); 11221da177e4SLinus Torvalds 11231da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 11241da177e4SLinus Torvalds if (chunk->msg) 11251da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 11261da177e4SLinus Torvalds 11271da177e4SLinus Torvalds sctp_chunk_put(chunk); 11281da177e4SLinus Torvalds } 11291da177e4SLinus Torvalds 11301da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 11311da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 11321da177e4SLinus Torvalds { 11331da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 11341da177e4SLinus Torvalds } 11351da177e4SLinus Torvalds 11361da177e4SLinus Torvalds /* Release a reference to the chunk. */ 11371da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 11381da177e4SLinus Torvalds { 11391da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 11401da177e4SLinus Torvalds sctp_chunk_destroy(ch); 11411da177e4SLinus Torvalds } 11421da177e4SLinus Torvalds 11431da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 11441da177e4SLinus Torvalds * enough. 11451da177e4SLinus Torvalds */ 11461da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 11471da177e4SLinus Torvalds { 11481da177e4SLinus Torvalds void *target; 11491da177e4SLinus Torvalds void *padding; 11501da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 11511da177e4SLinus Torvalds int padlen = chunklen % 4; 11521da177e4SLinus Torvalds 11531da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 11541da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 11551da177e4SLinus Torvalds 11561da177e4SLinus Torvalds memset(padding, 0, padlen); 11571da177e4SLinus Torvalds memcpy(target, data, len); 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds /* Adjust the chunk length field. */ 11601da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 11611da177e4SLinus Torvalds chunk->chunk_end = chunk->skb->tail; 11621da177e4SLinus Torvalds 11631da177e4SLinus Torvalds return target; 11641da177e4SLinus Torvalds } 11651da177e4SLinus Torvalds 11661da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 11671da177e4SLinus Torvalds * chunk is not big enough. 11681da177e4SLinus Torvalds * Returns a kernel err value. 11691da177e4SLinus Torvalds */ 11701da177e4SLinus Torvalds int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 11711da177e4SLinus Torvalds struct iovec *data) 11721da177e4SLinus Torvalds { 11731da177e4SLinus Torvalds __u8 *target; 11741da177e4SLinus Torvalds int err = 0; 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds /* Make room in chunk for data. */ 11771da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 11781da177e4SLinus Torvalds 11791da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 11801da177e4SLinus Torvalds if ((err = memcpy_fromiovecend(target, data, off, len))) 11811da177e4SLinus Torvalds goto out; 11821da177e4SLinus Torvalds 11831da177e4SLinus Torvalds /* Adjust the chunk length field. */ 11841da177e4SLinus Torvalds chunk->chunk_hdr->length = 11851da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 11861da177e4SLinus Torvalds chunk->chunk_end = chunk->skb->tail; 11871da177e4SLinus Torvalds 11881da177e4SLinus Torvalds out: 11891da177e4SLinus Torvalds return err; 11901da177e4SLinus Torvalds } 11911da177e4SLinus Torvalds 11921da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 11931da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 11941da177e4SLinus Torvalds */ 11951da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 11961da177e4SLinus Torvalds { 11971da177e4SLinus Torvalds __u16 ssn; 11981da177e4SLinus Torvalds __u16 sid; 11991da177e4SLinus Torvalds 12001da177e4SLinus Torvalds if (chunk->has_ssn) 12011da177e4SLinus Torvalds return; 12021da177e4SLinus Torvalds 12031da177e4SLinus Torvalds /* This is the last possible instant to assign a SSN. */ 12041da177e4SLinus Torvalds if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 12051da177e4SLinus Torvalds ssn = 0; 12061da177e4SLinus Torvalds } else { 12071da177e4SLinus Torvalds sid = htons(chunk->subh.data_hdr->stream); 12081da177e4SLinus Torvalds if (chunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 12091da177e4SLinus Torvalds ssn = sctp_ssn_next(&chunk->asoc->ssnmap->out, sid); 12101da177e4SLinus Torvalds else 12111da177e4SLinus Torvalds ssn = sctp_ssn_peek(&chunk->asoc->ssnmap->out, sid); 12121da177e4SLinus Torvalds ssn = htons(ssn); 12131da177e4SLinus Torvalds } 12141da177e4SLinus Torvalds 12151da177e4SLinus Torvalds chunk->subh.data_hdr->ssn = ssn; 12161da177e4SLinus Torvalds chunk->has_ssn = 1; 12171da177e4SLinus Torvalds } 12181da177e4SLinus Torvalds 12191da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 12201da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 12211da177e4SLinus Torvalds */ 12221da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 12231da177e4SLinus Torvalds { 12241da177e4SLinus Torvalds if (!chunk->has_tsn) { 12251da177e4SLinus Torvalds /* This is the last possible instant to 12261da177e4SLinus Torvalds * assign a TSN. 12271da177e4SLinus Torvalds */ 12281da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 12291da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 12301da177e4SLinus Torvalds chunk->has_tsn = 1; 12311da177e4SLinus Torvalds } 12321da177e4SLinus Torvalds } 12331da177e4SLinus Torvalds 12341da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 12351da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 12363182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 12373182cd84SAlexey Dobriyan unsigned int __nocast gfp) 12381da177e4SLinus Torvalds { 12391da177e4SLinus Torvalds struct sctp_association *asoc; 12401da177e4SLinus Torvalds struct sk_buff *skb; 12411da177e4SLinus Torvalds sctp_scope_t scope; 12421da177e4SLinus Torvalds struct sctp_af *af; 12431da177e4SLinus Torvalds 12441da177e4SLinus Torvalds /* Create the bare association. */ 12451da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 12461da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 12471da177e4SLinus Torvalds if (!asoc) 12481da177e4SLinus Torvalds goto nodata; 12491da177e4SLinus Torvalds asoc->temp = 1; 12501da177e4SLinus Torvalds skb = chunk->skb; 12511da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 12521da177e4SLinus Torvalds af = sctp_get_af_specific(ipver2af(skb->nh.iph->version)); 12531da177e4SLinus Torvalds if (unlikely(!af)) 12541da177e4SLinus Torvalds goto fail; 12551da177e4SLinus Torvalds af->from_skb(&asoc->c.peer_addr, skb, 1); 12561da177e4SLinus Torvalds nodata: 12571da177e4SLinus Torvalds return asoc; 12581da177e4SLinus Torvalds 12591da177e4SLinus Torvalds fail: 12601da177e4SLinus Torvalds sctp_association_free(asoc); 12611da177e4SLinus Torvalds return NULL; 12621da177e4SLinus Torvalds } 12631da177e4SLinus Torvalds 12641da177e4SLinus Torvalds /* Build a cookie representing asoc. 12651da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 12661da177e4SLinus Torvalds */ 12671da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 12681da177e4SLinus Torvalds const struct sctp_association *asoc, 12691da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 12701da177e4SLinus Torvalds int *cookie_len, 12711da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 12721da177e4SLinus Torvalds { 12731da177e4SLinus Torvalds sctp_cookie_param_t *retval; 12741da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 12751da177e4SLinus Torvalds struct scatterlist sg; 12761da177e4SLinus Torvalds int headersize, bodysize; 12771da177e4SLinus Torvalds unsigned int keylen; 12781da177e4SLinus Torvalds char *key; 12791da177e4SLinus Torvalds 12801da177e4SLinus Torvalds headersize = sizeof(sctp_paramhdr_t) + SCTP_SECRET_SIZE; 12811da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 12821da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 12831da177e4SLinus Torvalds 12841da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 12851da177e4SLinus Torvalds * functions simpler to write. 12861da177e4SLinus Torvalds */ 12871da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 12881da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 12891da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 12901da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 12911da177e4SLinus Torvalds 12921da177e4SLinus Torvalds retval = (sctp_cookie_param_t *)kmalloc(*cookie_len, GFP_ATOMIC); 12931da177e4SLinus Torvalds 12941da177e4SLinus Torvalds if (!retval) { 12951da177e4SLinus Torvalds *cookie_len = 0; 12961da177e4SLinus Torvalds goto nodata; 12971da177e4SLinus Torvalds } 12981da177e4SLinus Torvalds 12991da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 13001da177e4SLinus Torvalds * out on the network. 13011da177e4SLinus Torvalds */ 13021da177e4SLinus Torvalds memset(retval, 0x00, *cookie_len); 13031da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 13041da177e4SLinus Torvalds 13051da177e4SLinus Torvalds /* Set up the parameter header. */ 13061da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 13071da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 13101da177e4SLinus Torvalds cookie->c = asoc->c; 13111da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 13121da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 13131da177e4SLinus Torvalds 13141da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 13151da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 13161da177e4SLinus Torvalds 13171da177e4SLinus Torvalds /* Save adaption indication in the cookie. */ 13181da177e4SLinus Torvalds cookie->c.adaption_ind = asoc->peer.adaption_ind; 13191da177e4SLinus Torvalds 13201da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 13211da177e4SLinus Torvalds do_gettimeofday(&cookie->c.expiration); 13221da177e4SLinus Torvalds TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration); 13231da177e4SLinus Torvalds 13241da177e4SLinus Torvalds /* Copy the peer's init packet. */ 13251da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 13261da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 13271da177e4SLinus Torvalds 13281da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 13291da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 13301da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 13311da177e4SLinus Torvalds 13321da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 13331da177e4SLinus Torvalds /* Sign the message. */ 13341da177e4SLinus Torvalds sg.page = virt_to_page(&cookie->c); 13351da177e4SLinus Torvalds sg.offset = (unsigned long)(&cookie->c) % PAGE_SIZE; 13361da177e4SLinus Torvalds sg.length = bodysize; 13371da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 13381da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 13391da177e4SLinus Torvalds 13401da177e4SLinus Torvalds sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen, 13411da177e4SLinus Torvalds &sg, 1, cookie->signature); 13421da177e4SLinus Torvalds } 13431da177e4SLinus Torvalds 13441da177e4SLinus Torvalds nodata: 13451da177e4SLinus Torvalds return retval; 13461da177e4SLinus Torvalds } 13471da177e4SLinus Torvalds 13481da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 13491da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 13501da177e4SLinus Torvalds const struct sctp_endpoint *ep, 13511da177e4SLinus Torvalds const struct sctp_association *asoc, 13523182cd84SAlexey Dobriyan struct sctp_chunk *chunk, unsigned int __nocast gfp, 13531da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 13541da177e4SLinus Torvalds { 13551da177e4SLinus Torvalds struct sctp_association *retval = NULL; 13561da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 13571da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 13581da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 13591da177e4SLinus Torvalds __u8 digest[SCTP_SIGNATURE_SIZE]; 13601da177e4SLinus Torvalds struct scatterlist sg; 13611da177e4SLinus Torvalds unsigned int keylen, len; 13621da177e4SLinus Torvalds char *key; 13631da177e4SLinus Torvalds sctp_scope_t scope; 13641da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 13651da177e4SLinus Torvalds 13661da177e4SLinus Torvalds headersize = sizeof(sctp_chunkhdr_t) + SCTP_SECRET_SIZE; 13671da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 13681da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 13691da177e4SLinus Torvalds 13701da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 13711da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 13721da177e4SLinus Torvalds * INIT chunk. 13731da177e4SLinus Torvalds */ 13741da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 13751da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 13761da177e4SLinus Torvalds goto malformed; 13771da177e4SLinus Torvalds 13781da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 13791da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 13801da177e4SLinus Torvalds goto malformed; 13811da177e4SLinus Torvalds 13821da177e4SLinus Torvalds /* Process the cookie. */ 13831da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 13841da177e4SLinus Torvalds bear_cookie = &cookie->c; 13851da177e4SLinus Torvalds 13861da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 13871da177e4SLinus Torvalds goto no_hmac; 13881da177e4SLinus Torvalds 13891da177e4SLinus Torvalds /* Check the signature. */ 13901da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 13911da177e4SLinus Torvalds sg.page = virt_to_page(bear_cookie); 13921da177e4SLinus Torvalds sg.offset = (unsigned long)(bear_cookie) % PAGE_SIZE; 13931da177e4SLinus Torvalds sg.length = bodysize; 13941da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 13951da177e4SLinus Torvalds 13961da177e4SLinus Torvalds memset(digest, 0x00, sizeof(digest)); 13971da177e4SLinus Torvalds sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen, &sg, 13981da177e4SLinus Torvalds 1, digest); 13991da177e4SLinus Torvalds 14001da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 14011da177e4SLinus Torvalds /* Try the previous key. */ 14021da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->last_key]; 14031da177e4SLinus Torvalds memset(digest, 0x00, sizeof(digest)); 14041da177e4SLinus Torvalds sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen, 14051da177e4SLinus Torvalds &sg, 1, digest); 14061da177e4SLinus Torvalds 14071da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 14081da177e4SLinus Torvalds /* Yikes! Still bad signature! */ 14091da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 14101da177e4SLinus Torvalds goto fail; 14111da177e4SLinus Torvalds } 14121da177e4SLinus Torvalds } 14131da177e4SLinus Torvalds 14141da177e4SLinus Torvalds no_hmac: 14151da177e4SLinus Torvalds /* IG Section 2.35.2: 14161da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 14171da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 14181da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 14191da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 14201da177e4SLinus Torvalds * discarded, 14211da177e4SLinus Torvalds */ 14221da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 14231da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 14241da177e4SLinus Torvalds goto fail; 14251da177e4SLinus Torvalds } 14261da177e4SLinus Torvalds 14271da177e4SLinus Torvalds if (ntohs(chunk->sctp_hdr->source) != bear_cookie->peer_addr.v4.sin_port || 14281da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 14291da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 14301da177e4SLinus Torvalds goto fail; 14311da177e4SLinus Torvalds } 14321da177e4SLinus Torvalds 14331da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 14341da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 14351da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 14361da177e4SLinus Torvalds */ 14371da177e4SLinus Torvalds if (!asoc && tv_lt(bear_cookie->expiration, skb->stamp)) { 14381da177e4SLinus Torvalds __u16 len; 14391da177e4SLinus Torvalds /* 14401da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 14411da177e4SLinus Torvalds * 14421da177e4SLinus Torvalds * Cause of error 14431da177e4SLinus Torvalds * --------------- 14441da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 14451da177e4SLinus Torvalds * Cookie that has expired. 14461da177e4SLinus Torvalds */ 14471da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 14481da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 14491da177e4SLinus Torvalds if (*errp) { 14501da177e4SLinus Torvalds suseconds_t usecs = (skb->stamp.tv_sec - 14511da177e4SLinus Torvalds bear_cookie->expiration.tv_sec) * 1000000L + 14521da177e4SLinus Torvalds skb->stamp.tv_usec - 14531da177e4SLinus Torvalds bear_cookie->expiration.tv_usec; 14541da177e4SLinus Torvalds 14551da177e4SLinus Torvalds usecs = htonl(usecs); 14561da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 14571da177e4SLinus Torvalds &usecs, sizeof(usecs)); 14581da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 14591da177e4SLinus Torvalds } else 14601da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 14611da177e4SLinus Torvalds 14621da177e4SLinus Torvalds goto fail; 14631da177e4SLinus Torvalds } 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds /* Make a new base association. */ 14661da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 14671da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 14681da177e4SLinus Torvalds if (!retval) { 14691da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 14701da177e4SLinus Torvalds goto fail; 14711da177e4SLinus Torvalds } 14721da177e4SLinus Torvalds 14731da177e4SLinus Torvalds /* Set up our peer's port number. */ 14741da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 14751da177e4SLinus Torvalds 14761da177e4SLinus Torvalds /* Populate the association from the cookie. */ 14771da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 14781da177e4SLinus Torvalds 14791da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 14801da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 14811da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 14821da177e4SLinus Torvalds goto fail; 14831da177e4SLinus Torvalds } 14841da177e4SLinus Torvalds 14851da177e4SLinus Torvalds /* Also, add the destination address. */ 14861da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 14871da177e4SLinus Torvalds sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 14881da177e4SLinus Torvalds GFP_ATOMIC); 14891da177e4SLinus Torvalds } 14901da177e4SLinus Torvalds 14911da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 14921da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 14931da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 14941da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 14951da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 14961da177e4SLinus Torvalds retval->peer.adaption_ind = retval->c.adaption_ind; 14971da177e4SLinus Torvalds 14981da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 14991da177e4SLinus Torvalds return retval; 15001da177e4SLinus Torvalds 15011da177e4SLinus Torvalds fail: 15021da177e4SLinus Torvalds if (retval) 15031da177e4SLinus Torvalds sctp_association_free(retval); 15041da177e4SLinus Torvalds 15051da177e4SLinus Torvalds return NULL; 15061da177e4SLinus Torvalds 15071da177e4SLinus Torvalds malformed: 15081da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 15091da177e4SLinus Torvalds * malformed. 15101da177e4SLinus Torvalds */ 15111da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 15121da177e4SLinus Torvalds goto fail; 15131da177e4SLinus Torvalds } 15141da177e4SLinus Torvalds 15151da177e4SLinus Torvalds /******************************************************************** 15161da177e4SLinus Torvalds * 3rd Level Abstractions 15171da177e4SLinus Torvalds ********************************************************************/ 15181da177e4SLinus Torvalds 15191da177e4SLinus Torvalds struct __sctp_missing { 15201da177e4SLinus Torvalds __u32 num_missing; 15211da177e4SLinus Torvalds __u16 type; 15221da177e4SLinus Torvalds } __attribute__((packed)); 15231da177e4SLinus Torvalds 15241da177e4SLinus Torvalds /* 15251da177e4SLinus Torvalds * Report a missing mandatory parameter. 15261da177e4SLinus Torvalds */ 15271da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 15281da177e4SLinus Torvalds sctp_param_t paramtype, 15291da177e4SLinus Torvalds struct sctp_chunk *chunk, 15301da177e4SLinus Torvalds struct sctp_chunk **errp) 15311da177e4SLinus Torvalds { 15321da177e4SLinus Torvalds struct __sctp_missing report; 15331da177e4SLinus Torvalds __u16 len; 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 15361da177e4SLinus Torvalds 15371da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 15381da177e4SLinus Torvalds * returning multiple unknown parameters. 15391da177e4SLinus Torvalds */ 15401da177e4SLinus Torvalds if (!*errp) 15411da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 15421da177e4SLinus Torvalds 15431da177e4SLinus Torvalds if (*errp) { 15441da177e4SLinus Torvalds report.num_missing = htonl(1); 15451da177e4SLinus Torvalds report.type = paramtype; 15461da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 15471da177e4SLinus Torvalds &report, sizeof(report)); 15481da177e4SLinus Torvalds } 15491da177e4SLinus Torvalds 15501da177e4SLinus Torvalds /* Stop processing this chunk. */ 15511da177e4SLinus Torvalds return 0; 15521da177e4SLinus Torvalds } 15531da177e4SLinus Torvalds 15541da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 15551da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 15561da177e4SLinus Torvalds struct sctp_chunk *chunk, 15571da177e4SLinus Torvalds struct sctp_chunk **errp) 15581da177e4SLinus Torvalds { 15591da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 15601da177e4SLinus Torvalds 15611da177e4SLinus Torvalds if (!*errp) 15621da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 15631da177e4SLinus Torvalds 15641da177e4SLinus Torvalds if (*errp) 15651da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, NULL, 0); 15661da177e4SLinus Torvalds 15671da177e4SLinus Torvalds /* Stop processing this chunk. */ 15681da177e4SLinus Torvalds return 0; 15691da177e4SLinus Torvalds } 15701da177e4SLinus Torvalds 15711da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 15721da177e4SLinus Torvalds struct sctp_paramhdr *param, 15731da177e4SLinus Torvalds const struct sctp_chunk *chunk, 15741da177e4SLinus Torvalds struct sctp_chunk **errp) 15751da177e4SLinus Torvalds { 15761da177e4SLinus Torvalds char error[] = "The following parameter had invalid length:"; 15771da177e4SLinus Torvalds size_t payload_len = WORD_ROUND(sizeof(error)) + 15781da177e4SLinus Torvalds sizeof(sctp_paramhdr_t); 15791da177e4SLinus Torvalds 15801da177e4SLinus Torvalds 15811da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 15821da177e4SLinus Torvalds if (!*errp) 15831da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, payload_len); 15841da177e4SLinus Torvalds 15851da177e4SLinus Torvalds if (*errp) { 15861da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_PROTO_VIOLATION, error, 15871da177e4SLinus Torvalds sizeof(error)); 15881da177e4SLinus Torvalds sctp_addto_chunk(*errp, sizeof(sctp_paramhdr_t), param); 15891da177e4SLinus Torvalds } 15901da177e4SLinus Torvalds 15911da177e4SLinus Torvalds return 0; 15921da177e4SLinus Torvalds } 15931da177e4SLinus Torvalds 15941da177e4SLinus Torvalds 15951da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 15961da177e4SLinus Torvalds * send back an indicator to the peer. 15971da177e4SLinus Torvalds */ 15981da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 15991da177e4SLinus Torvalds union sctp_params param, 16001da177e4SLinus Torvalds struct sctp_chunk *chunk, 16011da177e4SLinus Torvalds struct sctp_chunk **errp) 16021da177e4SLinus Torvalds { 16031da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds /* Make an ERROR chunk. */ 16061da177e4SLinus Torvalds if (!*errp) 16071da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 16081da177e4SLinus Torvalds 16091da177e4SLinus Torvalds if (*errp) 16101da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, 16111da177e4SLinus Torvalds param.v, len); 16121da177e4SLinus Torvalds 16131da177e4SLinus Torvalds /* Stop processing this chunk. */ 16141da177e4SLinus Torvalds return 0; 16151da177e4SLinus Torvalds } 16161da177e4SLinus Torvalds 16171da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 16181da177e4SLinus Torvalds * 16191da177e4SLinus Torvalds * The Parameter Types are encoded such that the 16201da177e4SLinus Torvalds * highest-order two bits specify the action that must be 16211da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 16221da177e4SLinus Torvalds * Parameter Type. 16231da177e4SLinus Torvalds * 16241da177e4SLinus Torvalds * 00 - Stop processing this SCTP chunk and discard it, 16251da177e4SLinus Torvalds * do not process any further chunks within it. 16261da177e4SLinus Torvalds * 16271da177e4SLinus Torvalds * 01 - Stop processing this SCTP chunk and discard it, 16281da177e4SLinus Torvalds * do not process any further chunks within it, and report 16291da177e4SLinus Torvalds * the unrecognized parameter in an 'Unrecognized 16301da177e4SLinus Torvalds * Parameter Type' (in either an ERROR or in the INIT ACK). 16311da177e4SLinus Torvalds * 16321da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 16331da177e4SLinus Torvalds * 16341da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 16351da177e4SLinus Torvalds * report the unrecognized parameter in an 16361da177e4SLinus Torvalds * 'Unrecognized Parameter Type' (in either an ERROR or in 16371da177e4SLinus Torvalds * the INIT ACK). 16381da177e4SLinus Torvalds * 16391da177e4SLinus Torvalds * Return value: 16401da177e4SLinus Torvalds * 0 - discard the chunk 16411da177e4SLinus Torvalds * 1 - continue with the chunk 16421da177e4SLinus Torvalds */ 16431da177e4SLinus Torvalds static int sctp_process_unk_param(const struct sctp_association *asoc, 16441da177e4SLinus Torvalds union sctp_params param, 16451da177e4SLinus Torvalds struct sctp_chunk *chunk, 16461da177e4SLinus Torvalds struct sctp_chunk **errp) 16471da177e4SLinus Torvalds { 16481da177e4SLinus Torvalds int retval = 1; 16491da177e4SLinus Torvalds 16501da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 16511da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 16521da177e4SLinus Torvalds retval = 0; 16531da177e4SLinus Torvalds break; 16541da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD_ERR: 16551da177e4SLinus Torvalds retval = 0; 16561da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 16571da177e4SLinus Torvalds * returning multiple unknown parameters. 16581da177e4SLinus Torvalds */ 16591da177e4SLinus Torvalds if (NULL == *errp) 16601da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 16611da177e4SLinus Torvalds ntohs(chunk->chunk_hdr->length)); 16621da177e4SLinus Torvalds 16631da177e4SLinus Torvalds if (*errp) 16641da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, 16651da177e4SLinus Torvalds param.v, 16661da177e4SLinus Torvalds WORD_ROUND(ntohs(param.p->length))); 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds break; 16691da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 16701da177e4SLinus Torvalds break; 16711da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 16721da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 16731da177e4SLinus Torvalds * returning multiple unknown parameters. 16741da177e4SLinus Torvalds */ 16751da177e4SLinus Torvalds if (NULL == *errp) 16761da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 16771da177e4SLinus Torvalds ntohs(chunk->chunk_hdr->length)); 16781da177e4SLinus Torvalds 16791da177e4SLinus Torvalds if (*errp) { 16801da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, 16811da177e4SLinus Torvalds param.v, 16821da177e4SLinus Torvalds WORD_ROUND(ntohs(param.p->length))); 16831da177e4SLinus Torvalds } else { 16841da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 16851da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 16861da177e4SLinus Torvalds * to the peer and the association won't be 16871da177e4SLinus Torvalds * established. 16881da177e4SLinus Torvalds */ 16891da177e4SLinus Torvalds retval = 0; 16901da177e4SLinus Torvalds } 16911da177e4SLinus Torvalds 16921da177e4SLinus Torvalds break; 16931da177e4SLinus Torvalds default: 16941da177e4SLinus Torvalds break; 16951da177e4SLinus Torvalds } 16961da177e4SLinus Torvalds 16971da177e4SLinus Torvalds return retval; 16981da177e4SLinus Torvalds } 16991da177e4SLinus Torvalds 17001da177e4SLinus Torvalds /* Find unrecognized parameters in the chunk. 17011da177e4SLinus Torvalds * Return values: 17021da177e4SLinus Torvalds * 0 - discard the chunk 17031da177e4SLinus Torvalds * 1 - continue with the chunk 17041da177e4SLinus Torvalds */ 17051da177e4SLinus Torvalds static int sctp_verify_param(const struct sctp_association *asoc, 17061da177e4SLinus Torvalds union sctp_params param, 17071da177e4SLinus Torvalds sctp_cid_t cid, 17081da177e4SLinus Torvalds struct sctp_chunk *chunk, 17091da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 17101da177e4SLinus Torvalds { 17111da177e4SLinus Torvalds int retval = 1; 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 17141da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 17151da177e4SLinus Torvalds * identified based on the chunk id. 17161da177e4SLinus Torvalds */ 17171da177e4SLinus Torvalds 17181da177e4SLinus Torvalds switch (param.p->type) { 17191da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 17201da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 17211da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 17221da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 17231da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 17241da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 17251da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 17261da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 17271da177e4SLinus Torvalds case SCTP_PARAM_ADAPTION_LAYER_IND: 17281da177e4SLinus Torvalds break; 17291da177e4SLinus Torvalds 17301da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 17311da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 17321da177e4SLinus Torvalds return sctp_process_hn_param(asoc, param, chunk, err_chunk); 17331da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 17341da177e4SLinus Torvalds if (sctp_prsctp_enable) 17351da177e4SLinus Torvalds break; 17361da177e4SLinus Torvalds /* Fall Through */ 17371da177e4SLinus Torvalds default: 17381da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n", 17391da177e4SLinus Torvalds ntohs(param.p->type), cid); 17401da177e4SLinus Torvalds return sctp_process_unk_param(asoc, param, chunk, err_chunk); 17411da177e4SLinus Torvalds 17421da177e4SLinus Torvalds break; 17431da177e4SLinus Torvalds } 17441da177e4SLinus Torvalds return retval; 17451da177e4SLinus Torvalds } 17461da177e4SLinus Torvalds 17471da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 17481da177e4SLinus Torvalds int sctp_verify_init(const struct sctp_association *asoc, 17491da177e4SLinus Torvalds sctp_cid_t cid, 17501da177e4SLinus Torvalds sctp_init_chunk_t *peer_init, 17511da177e4SLinus Torvalds struct sctp_chunk *chunk, 17521da177e4SLinus Torvalds struct sctp_chunk **errp) 17531da177e4SLinus Torvalds { 17541da177e4SLinus Torvalds union sctp_params param; 17551da177e4SLinus Torvalds int has_cookie = 0; 17561da177e4SLinus Torvalds 17571da177e4SLinus Torvalds /* Verify stream values are non-zero. */ 17581da177e4SLinus Torvalds if ((0 == peer_init->init_hdr.num_outbound_streams) || 17591da177e4SLinus Torvalds (0 == peer_init->init_hdr.num_inbound_streams)) { 17601da177e4SLinus Torvalds 17611da177e4SLinus Torvalds sctp_process_inv_mandatory(asoc, chunk, errp); 17621da177e4SLinus Torvalds return 0; 17631da177e4SLinus Torvalds } 17641da177e4SLinus Torvalds 17651da177e4SLinus Torvalds /* Check for missing mandatory parameters. */ 17661da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 17671da177e4SLinus Torvalds 17681da177e4SLinus Torvalds if (SCTP_PARAM_STATE_COOKIE == param.p->type) 17691da177e4SLinus Torvalds has_cookie = 1; 17701da177e4SLinus Torvalds 17711da177e4SLinus Torvalds } /* for (loop through all parameters) */ 17721da177e4SLinus Torvalds 17731da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 17741da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 17751da177e4SLinus Torvalds * The current param.p would point at the bad one. 17761da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 17771da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 17781da177e4SLinus Torvalds * error handling code build and send the packet. 17791da177e4SLinus Torvalds */ 17801da177e4SLinus Torvalds if (param.v < (void*)chunk->chunk_end - sizeof(sctp_paramhdr_t)) { 17811da177e4SLinus Torvalds sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 17821da177e4SLinus Torvalds return 0; 17831da177e4SLinus Torvalds } 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds /* The only missing mandatory param possible today is 17861da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 17871da177e4SLinus Torvalds */ 17881da177e4SLinus Torvalds if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) { 17891da177e4SLinus Torvalds sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 17901da177e4SLinus Torvalds chunk, errp); 17911da177e4SLinus Torvalds return 0; 17921da177e4SLinus Torvalds } 17931da177e4SLinus Torvalds 17941da177e4SLinus Torvalds /* Find unrecognized parameters. */ 17951da177e4SLinus Torvalds 17961da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 17971da177e4SLinus Torvalds 17981da177e4SLinus Torvalds if (!sctp_verify_param(asoc, param, cid, chunk, errp)) { 17991da177e4SLinus Torvalds if (SCTP_PARAM_HOST_NAME_ADDRESS == param.p->type) 18001da177e4SLinus Torvalds return 0; 18011da177e4SLinus Torvalds else 18021da177e4SLinus Torvalds return 1; 18031da177e4SLinus Torvalds } 18041da177e4SLinus Torvalds 18051da177e4SLinus Torvalds } /* for (loop through all parameters) */ 18061da177e4SLinus Torvalds 18071da177e4SLinus Torvalds return 1; 18081da177e4SLinus Torvalds } 18091da177e4SLinus Torvalds 18101da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 18111da177e4SLinus Torvalds * Returns 0 on failure, else success. 18121da177e4SLinus Torvalds * FIXME: This is an association method. 18131da177e4SLinus Torvalds */ 18141da177e4SLinus Torvalds int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid, 18151da177e4SLinus Torvalds const union sctp_addr *peer_addr, 18163182cd84SAlexey Dobriyan sctp_init_chunk_t *peer_init, unsigned int __nocast gfp) 18171da177e4SLinus Torvalds { 18181da177e4SLinus Torvalds union sctp_params param; 18191da177e4SLinus Torvalds struct sctp_transport *transport; 18201da177e4SLinus Torvalds struct list_head *pos, *temp; 18211da177e4SLinus Torvalds char *cookie; 18221da177e4SLinus Torvalds 18231da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 18241da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 18251da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 18261da177e4SLinus Torvalds * of the INIT from the cookie. 18271da177e4SLinus Torvalds */ 18281da177e4SLinus Torvalds 18291da177e4SLinus Torvalds /* This implementation defaults to making the first transport 18301da177e4SLinus Torvalds * added as the primary transport. The source address seems to 18311da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 18321da177e4SLinus Torvalds */ 18331da177e4SLinus Torvalds if (peer_addr) 18343f7a87d2SFrank Filz if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 18351da177e4SLinus Torvalds goto nomem; 18361da177e4SLinus Torvalds 18371da177e4SLinus Torvalds /* Process the initialization parameters. */ 18381da177e4SLinus Torvalds 18391da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 18401da177e4SLinus Torvalds 18411da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 18421da177e4SLinus Torvalds goto clean_up; 18431da177e4SLinus Torvalds } 18441da177e4SLinus Torvalds 18453f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 18463f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 18473f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 18483f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 18493f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 18503f7a87d2SFrank Filz } 18513f7a87d2SFrank Filz } 18523f7a87d2SFrank Filz 18531da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 18541da177e4SLinus Torvalds * order. 18551da177e4SLinus Torvalds */ 18561da177e4SLinus Torvalds asoc->peer.i.init_tag = 18571da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 18581da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 18591da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 18601da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 18611da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 18621da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 18631da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 18641da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 18651da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 18661da177e4SLinus Torvalds 18671da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 18681da177e4SLinus Torvalds * number of inbound streams. 18691da177e4SLinus Torvalds */ 18701da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 18711da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 18721da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 18731da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 18741da177e4SLinus Torvalds } 18751da177e4SLinus Torvalds 18761da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 18771da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 18781da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 18791da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 18801da177e4SLinus Torvalds } 18811da177e4SLinus Torvalds 18821da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 18831da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 18841da177e4SLinus Torvalds 18851da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 18861da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 18871da177e4SLinus Torvalds 18881da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 18891da177e4SLinus Torvalds cookie = asoc->peer.cookie; 18901da177e4SLinus Torvalds if (cookie) { 18911da177e4SLinus Torvalds asoc->peer.cookie = kmalloc(asoc->peer.cookie_len, gfp); 18921da177e4SLinus Torvalds if (!asoc->peer.cookie) 18931da177e4SLinus Torvalds goto clean_up; 18941da177e4SLinus Torvalds memcpy(asoc->peer.cookie, cookie, asoc->peer.cookie_len); 18951da177e4SLinus Torvalds } 18961da177e4SLinus Torvalds 18971da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 18981da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 18991da177e4SLinus Torvalds * advertised window). 19001da177e4SLinus Torvalds */ 19011da177e4SLinus Torvalds list_for_each(pos, &asoc->peer.transport_addr_list) { 19021da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 19031da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 19041da177e4SLinus Torvalds } 19051da177e4SLinus Torvalds 19061da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 19071da177e4SLinus Torvalds sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE, 19081da177e4SLinus Torvalds asoc->peer.i.initial_tsn); 19091da177e4SLinus Torvalds 19101da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 19111da177e4SLinus Torvalds * 19121da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 19131da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 19141da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 19151da177e4SLinus Torvalds * stream sequence number shall be set to 0. 19161da177e4SLinus Torvalds */ 19171da177e4SLinus Torvalds 19183f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 19193f7a87d2SFrank Filz * association. 19201da177e4SLinus Torvalds */ 19211da177e4SLinus Torvalds if (!asoc->temp) { 19221da177e4SLinus Torvalds int assoc_id; 19231da177e4SLinus Torvalds int error; 19241da177e4SLinus Torvalds 19251da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 19261da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 19271da177e4SLinus Torvalds if (!asoc->ssnmap) 19281da177e4SLinus Torvalds goto clean_up; 19291da177e4SLinus Torvalds 19301da177e4SLinus Torvalds retry: 19311da177e4SLinus Torvalds if (unlikely(!idr_pre_get(&sctp_assocs_id, gfp))) 19321da177e4SLinus Torvalds goto clean_up; 19331da177e4SLinus Torvalds spin_lock_bh(&sctp_assocs_id_lock); 19341da177e4SLinus Torvalds error = idr_get_new_above(&sctp_assocs_id, (void *)asoc, 1, 19351da177e4SLinus Torvalds &assoc_id); 19361da177e4SLinus Torvalds spin_unlock_bh(&sctp_assocs_id_lock); 19371da177e4SLinus Torvalds if (error == -EAGAIN) 19381da177e4SLinus Torvalds goto retry; 19391da177e4SLinus Torvalds else if (error) 19401da177e4SLinus Torvalds goto clean_up; 19411da177e4SLinus Torvalds 19421da177e4SLinus Torvalds asoc->assoc_id = (sctp_assoc_t) assoc_id; 19431da177e4SLinus Torvalds } 19441da177e4SLinus Torvalds 19451da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 19461da177e4SLinus Torvalds * 19471da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 19481da177e4SLinus Torvalds * remote endpoint it should do the following: 19491da177e4SLinus Torvalds * ... 19501da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 19511da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 19521da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 19531da177e4SLinus Torvalds * association to the same value as the Initial TSN. 19541da177e4SLinus Torvalds */ 19551da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 19561da177e4SLinus Torvalds return 1; 19571da177e4SLinus Torvalds 19581da177e4SLinus Torvalds clean_up: 19591da177e4SLinus Torvalds /* Release the transport structures. */ 19601da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 19611da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 19621da177e4SLinus Torvalds list_del_init(pos); 19631da177e4SLinus Torvalds sctp_transport_free(transport); 19641da177e4SLinus Torvalds } 19653f7a87d2SFrank Filz 19663f7a87d2SFrank Filz asoc->peer.transport_count = 0; 19673f7a87d2SFrank Filz 19681da177e4SLinus Torvalds nomem: 19691da177e4SLinus Torvalds return 0; 19701da177e4SLinus Torvalds } 19711da177e4SLinus Torvalds 19721da177e4SLinus Torvalds 19731da177e4SLinus Torvalds /* Update asoc with the option described in param. 19741da177e4SLinus Torvalds * 19751da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 19761da177e4SLinus Torvalds * 19771da177e4SLinus Torvalds * asoc is the association to update. 19781da177e4SLinus Torvalds * param is the variable length parameter to use for update. 19791da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 19801da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 19811da177e4SLinus Torvalds * work we do. In particular, we should not build transport 19821da177e4SLinus Torvalds * structures for the addresses. 19831da177e4SLinus Torvalds */ 19841da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 19851da177e4SLinus Torvalds union sctp_params param, 19861da177e4SLinus Torvalds const union sctp_addr *peer_addr, 19873182cd84SAlexey Dobriyan unsigned int __nocast gfp) 19881da177e4SLinus Torvalds { 19891da177e4SLinus Torvalds union sctp_addr addr; 19901da177e4SLinus Torvalds int i; 19911da177e4SLinus Torvalds __u16 sat; 19921da177e4SLinus Torvalds int retval = 1; 19931da177e4SLinus Torvalds sctp_scope_t scope; 19941da177e4SLinus Torvalds time_t stale; 19951da177e4SLinus Torvalds struct sctp_af *af; 19961da177e4SLinus Torvalds 19971da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 19981da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 19991da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 20001da177e4SLinus Torvalds */ 20011da177e4SLinus Torvalds switch (param.p->type) { 20021da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 20031da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 20041da177e4SLinus Torvalds break; 20051da177e4SLinus Torvalds /* Fall through. */ 20061da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 20071da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 20081da177e4SLinus Torvalds af->from_addr_param(&addr, param.addr, asoc->peer.port, 0); 20091da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 20101da177e4SLinus Torvalds if (sctp_in_scope(&addr, scope)) 20113f7a87d2SFrank Filz if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_ACTIVE)) 20121da177e4SLinus Torvalds return 0; 20131da177e4SLinus Torvalds break; 20141da177e4SLinus Torvalds 20151da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 20161da177e4SLinus Torvalds if (!sctp_cookie_preserve_enable) 20171da177e4SLinus Torvalds break; 20181da177e4SLinus Torvalds 20191da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 20201da177e4SLinus Torvalds 20211da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 20221da177e4SLinus Torvalds * (1/1000sec). 20231da177e4SLinus Torvalds */ 20241da177e4SLinus Torvalds asoc->cookie_life.tv_sec += stale / 1000; 20251da177e4SLinus Torvalds asoc->cookie_life.tv_usec += (stale % 1000) * 1000; 20261da177e4SLinus Torvalds break; 20271da177e4SLinus Torvalds 20281da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 20291da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n"); 20301da177e4SLinus Torvalds break; 20311da177e4SLinus Torvalds 20321da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 20331da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 20341da177e4SLinus Torvalds * ones are really set by the peer. 20351da177e4SLinus Torvalds */ 20361da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 20371da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 20381da177e4SLinus Torvalds 20391da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 20401da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 20411da177e4SLinus Torvalds if (sat) 20421da177e4SLinus Torvalds sat /= sizeof(__u16); 20431da177e4SLinus Torvalds 20441da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 20451da177e4SLinus Torvalds switch (param.sat->types[i]) { 20461da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 20471da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 20481da177e4SLinus Torvalds break; 20491da177e4SLinus Torvalds 20501da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 20511da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 20521da177e4SLinus Torvalds break; 20531da177e4SLinus Torvalds 20541da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 20551da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 20561da177e4SLinus Torvalds break; 20571da177e4SLinus Torvalds 20581da177e4SLinus Torvalds default: /* Just ignore anything else. */ 20591da177e4SLinus Torvalds break; 20601da177e4SLinus Torvalds }; 20611da177e4SLinus Torvalds } 20621da177e4SLinus Torvalds break; 20631da177e4SLinus Torvalds 20641da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 20651da177e4SLinus Torvalds asoc->peer.cookie_len = 20661da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 20671da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 20681da177e4SLinus Torvalds break; 20691da177e4SLinus Torvalds 20701da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 20711da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 20721da177e4SLinus Torvalds break; 20731da177e4SLinus Torvalds 20741da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 20751da177e4SLinus Torvalds /* Rejected during verify stage. */ 20761da177e4SLinus Torvalds break; 20771da177e4SLinus Torvalds 20781da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 20791da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 20801da177e4SLinus Torvalds break; 20811da177e4SLinus Torvalds 20821da177e4SLinus Torvalds case SCTP_PARAM_ADAPTION_LAYER_IND: 20831da177e4SLinus Torvalds asoc->peer.adaption_ind = param.aind->adaption_ind; 20841da177e4SLinus Torvalds break; 20851da177e4SLinus Torvalds 20861da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 20871da177e4SLinus Torvalds if (sctp_prsctp_enable) { 20881da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 20891da177e4SLinus Torvalds break; 20901da177e4SLinus Torvalds } 20911da177e4SLinus Torvalds /* Fall Through */ 20921da177e4SLinus Torvalds default: 20931da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 20941da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 20951da177e4SLinus Torvalds * called prior to this routine. Simply log the error 20961da177e4SLinus Torvalds * here. 20971da177e4SLinus Torvalds */ 20981da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n", 20991da177e4SLinus Torvalds ntohs(param.p->type), asoc); 21001da177e4SLinus Torvalds break; 21011da177e4SLinus Torvalds }; 21021da177e4SLinus Torvalds 21031da177e4SLinus Torvalds return retval; 21041da177e4SLinus Torvalds } 21051da177e4SLinus Torvalds 21061da177e4SLinus Torvalds /* Select a new verification tag. */ 21071da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 21081da177e4SLinus Torvalds { 21091da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 21101da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 21111da177e4SLinus Torvalds */ 21121da177e4SLinus Torvalds __u32 x; 21131da177e4SLinus Torvalds 21141da177e4SLinus Torvalds do { 21151da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 21161da177e4SLinus Torvalds } while (x == 0); 21171da177e4SLinus Torvalds 21181da177e4SLinus Torvalds return x; 21191da177e4SLinus Torvalds } 21201da177e4SLinus Torvalds 21211da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 21221da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 21231da177e4SLinus Torvalds { 21241da177e4SLinus Torvalds __u32 retval; 21251da177e4SLinus Torvalds 21261da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 21271da177e4SLinus Torvalds return retval; 21281da177e4SLinus Torvalds } 21291da177e4SLinus Torvalds 21301da177e4SLinus Torvalds /* 21311da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 21321da177e4SLinus Torvalds * 0 1 2 3 21331da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 21341da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21351da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 21361da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21371da177e4SLinus Torvalds * | Serial Number | 21381da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21391da177e4SLinus Torvalds * | Address Parameter | 21401da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21411da177e4SLinus Torvalds * | ASCONF Parameter #1 | 21421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21431da177e4SLinus Torvalds * \ \ 21441da177e4SLinus Torvalds * / .... / 21451da177e4SLinus Torvalds * \ \ 21461da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21471da177e4SLinus Torvalds * | ASCONF Parameter #N | 21481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21491da177e4SLinus Torvalds * 21501da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 21511da177e4SLinus Torvalds */ 21521da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 21531da177e4SLinus Torvalds union sctp_addr *addr, 21541da177e4SLinus Torvalds int vparam_len) 21551da177e4SLinus Torvalds { 21561da177e4SLinus Torvalds sctp_addiphdr_t asconf; 21571da177e4SLinus Torvalds struct sctp_chunk *retval; 21581da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 21591da177e4SLinus Torvalds union sctp_addr_param addrparam; 21601da177e4SLinus Torvalds int addrlen; 21611da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 21621da177e4SLinus Torvalds 21631da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 21641da177e4SLinus Torvalds if (!addrlen) 21651da177e4SLinus Torvalds return NULL; 21661da177e4SLinus Torvalds length += addrlen; 21671da177e4SLinus Torvalds 21681da177e4SLinus Torvalds /* Create the chunk. */ 21691da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length); 21701da177e4SLinus Torvalds if (!retval) 21711da177e4SLinus Torvalds return NULL; 21721da177e4SLinus Torvalds 21731da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 21741da177e4SLinus Torvalds 21751da177e4SLinus Torvalds retval->subh.addip_hdr = 21761da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 21771da177e4SLinus Torvalds retval->param_hdr.v = 21781da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 21791da177e4SLinus Torvalds 21801da177e4SLinus Torvalds return retval; 21811da177e4SLinus Torvalds } 21821da177e4SLinus Torvalds 21831da177e4SLinus Torvalds /* ADDIP 21841da177e4SLinus Torvalds * 3.2.1 Add IP Address 21851da177e4SLinus Torvalds * 0 1 2 3 21861da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 21871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21881da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 21891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21901da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 21911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21921da177e4SLinus Torvalds * | Address Parameter | 21931da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21941da177e4SLinus Torvalds * 21951da177e4SLinus Torvalds * 3.2.2 Delete IP Address 21961da177e4SLinus Torvalds * 0 1 2 3 21971da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 21981da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 21991da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 22001da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 22011da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 22021da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 22031da177e4SLinus Torvalds * | Address Parameter | 22041da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 22051da177e4SLinus Torvalds * 22061da177e4SLinus Torvalds */ 22071da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 22081da177e4SLinus Torvalds union sctp_addr *laddr, 22091da177e4SLinus Torvalds struct sockaddr *addrs, 22101da177e4SLinus Torvalds int addrcnt, 22111da177e4SLinus Torvalds __u16 flags) 22121da177e4SLinus Torvalds { 22131da177e4SLinus Torvalds sctp_addip_param_t param; 22141da177e4SLinus Torvalds struct sctp_chunk *retval; 22151da177e4SLinus Torvalds union sctp_addr_param addr_param; 22161da177e4SLinus Torvalds union sctp_addr *addr; 22171da177e4SLinus Torvalds void *addr_buf; 22181da177e4SLinus Torvalds struct sctp_af *af; 22191da177e4SLinus Torvalds int paramlen = sizeof(param); 22201da177e4SLinus Torvalds int addr_param_len = 0; 22211da177e4SLinus Torvalds int totallen = 0; 22221da177e4SLinus Torvalds int i; 22231da177e4SLinus Torvalds 22241da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 22251da177e4SLinus Torvalds addr_buf = addrs; 22261da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 22271da177e4SLinus Torvalds addr = (union sctp_addr *)addr_buf; 22281da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 22291da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 22301da177e4SLinus Torvalds 22311da177e4SLinus Torvalds totallen += paramlen; 22321da177e4SLinus Torvalds totallen += addr_param_len; 22331da177e4SLinus Torvalds 22341da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 22351da177e4SLinus Torvalds } 22361da177e4SLinus Torvalds 22371da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 22381da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 22391da177e4SLinus Torvalds if (!retval) 22401da177e4SLinus Torvalds return NULL; 22411da177e4SLinus Torvalds 22421da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 22431da177e4SLinus Torvalds addr_buf = addrs; 22441da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 22451da177e4SLinus Torvalds addr = (union sctp_addr *)addr_buf; 22461da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 22471da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 22481da177e4SLinus Torvalds param.param_hdr.type = flags; 22491da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 22501da177e4SLinus Torvalds param.crr_id = i; 22511da177e4SLinus Torvalds 22521da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 22531da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 22541da177e4SLinus Torvalds 22551da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 22561da177e4SLinus Torvalds } 22571da177e4SLinus Torvalds return retval; 22581da177e4SLinus Torvalds } 22591da177e4SLinus Torvalds 22601da177e4SLinus Torvalds /* ADDIP 22611da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 22621da177e4SLinus Torvalds * 0 1 2 3 22631da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 22641da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 22651da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 22661da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 22671da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 22681da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 22691da177e4SLinus Torvalds * | Address Parameter | 22701da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 22711da177e4SLinus Torvalds * 22721da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 22731da177e4SLinus Torvalds */ 22741da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 22751da177e4SLinus Torvalds union sctp_addr *addr) 22761da177e4SLinus Torvalds { 22771da177e4SLinus Torvalds sctp_addip_param_t param; 22781da177e4SLinus Torvalds struct sctp_chunk *retval; 22791da177e4SLinus Torvalds int len = sizeof(param); 22801da177e4SLinus Torvalds union sctp_addr_param addrparam; 22811da177e4SLinus Torvalds int addrlen; 22821da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 22831da177e4SLinus Torvalds 22841da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 22851da177e4SLinus Torvalds if (!addrlen) 22861da177e4SLinus Torvalds return NULL; 22871da177e4SLinus Torvalds len += addrlen; 22881da177e4SLinus Torvalds 22891da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 22901da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 22911da177e4SLinus Torvalds if (!retval) 22921da177e4SLinus Torvalds return NULL; 22931da177e4SLinus Torvalds 22941da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 22951da177e4SLinus Torvalds param.param_hdr.length = htons(len); 22961da177e4SLinus Torvalds param.crr_id = 0; 22971da177e4SLinus Torvalds 22981da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 22991da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 23001da177e4SLinus Torvalds 23011da177e4SLinus Torvalds return retval; 23021da177e4SLinus Torvalds } 23031da177e4SLinus Torvalds 23041da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 23051da177e4SLinus Torvalds * 0 1 2 3 23061da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 23071da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 23081da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 23091da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 23101da177e4SLinus Torvalds * | Serial Number | 23111da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 23121da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 23131da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 23141da177e4SLinus Torvalds * \ \ 23151da177e4SLinus Torvalds * / .... / 23161da177e4SLinus Torvalds * \ \ 23171da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 23181da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 23191da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 23201da177e4SLinus Torvalds * 23211da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 23221da177e4SLinus Torvalds */ 23231da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 23241da177e4SLinus Torvalds __u32 serial, int vparam_len) 23251da177e4SLinus Torvalds { 23261da177e4SLinus Torvalds sctp_addiphdr_t asconf; 23271da177e4SLinus Torvalds struct sctp_chunk *retval; 23281da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 23291da177e4SLinus Torvalds 23301da177e4SLinus Torvalds /* Create the chunk. */ 23311da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length); 23321da177e4SLinus Torvalds if (!retval) 23331da177e4SLinus Torvalds return NULL; 23341da177e4SLinus Torvalds 23351da177e4SLinus Torvalds asconf.serial = htonl(serial); 23361da177e4SLinus Torvalds 23371da177e4SLinus Torvalds retval->subh.addip_hdr = 23381da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 23391da177e4SLinus Torvalds 23401da177e4SLinus Torvalds return retval; 23411da177e4SLinus Torvalds } 23421da177e4SLinus Torvalds 23431da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 23441da177e4SLinus Torvalds static void sctp_add_asconf_response(struct sctp_chunk *chunk, __u32 crr_id, 23451da177e4SLinus Torvalds __u16 err_code, sctp_addip_param_t *asconf_param) 23461da177e4SLinus Torvalds { 23471da177e4SLinus Torvalds sctp_addip_param_t ack_param; 23481da177e4SLinus Torvalds sctp_errhdr_t err_param; 23491da177e4SLinus Torvalds int asconf_param_len = 0; 23501da177e4SLinus Torvalds int err_param_len = 0; 23511da177e4SLinus Torvalds __u16 response_type; 23521da177e4SLinus Torvalds 23531da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 23541da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 23551da177e4SLinus Torvalds } else { 23561da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 23571da177e4SLinus Torvalds err_param_len = sizeof(err_param); 23581da177e4SLinus Torvalds if (asconf_param) 23591da177e4SLinus Torvalds asconf_param_len = 23601da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 23611da177e4SLinus Torvalds } 23621da177e4SLinus Torvalds 23631da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 23641da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 23651da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 23661da177e4SLinus Torvalds err_param_len + 23671da177e4SLinus Torvalds asconf_param_len); 23681da177e4SLinus Torvalds ack_param.crr_id = crr_id; 23691da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 23701da177e4SLinus Torvalds 23711da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 23721da177e4SLinus Torvalds return; 23731da177e4SLinus Torvalds 23741da177e4SLinus Torvalds /* Add Error Cause parameter. */ 23751da177e4SLinus Torvalds err_param.cause = err_code; 23761da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 23771da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 23781da177e4SLinus Torvalds 23791da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 23801da177e4SLinus Torvalds if (asconf_param) 23811da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 23821da177e4SLinus Torvalds } 23831da177e4SLinus Torvalds 23841da177e4SLinus Torvalds /* Process a asconf parameter. */ 23851da177e4SLinus Torvalds static __u16 sctp_process_asconf_param(struct sctp_association *asoc, 23861da177e4SLinus Torvalds struct sctp_chunk *asconf, 23871da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 23881da177e4SLinus Torvalds { 23891da177e4SLinus Torvalds struct sctp_transport *peer; 23901da177e4SLinus Torvalds struct sctp_af *af; 23911da177e4SLinus Torvalds union sctp_addr addr; 23921da177e4SLinus Torvalds struct list_head *pos; 23931da177e4SLinus Torvalds union sctp_addr_param *addr_param; 23941da177e4SLinus Torvalds 23951da177e4SLinus Torvalds addr_param = (union sctp_addr_param *) 23961da177e4SLinus Torvalds ((void *)asconf_param + sizeof(sctp_addip_param_t)); 23971da177e4SLinus Torvalds 23981da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); 23991da177e4SLinus Torvalds if (unlikely(!af)) 24001da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 24011da177e4SLinus Torvalds 24021da177e4SLinus Torvalds af->from_addr_param(&addr, addr_param, asoc->peer.port, 0); 24031da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 24041da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 24051da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 24061da177e4SLinus Torvalds * request and does not have the local resources to add this 24071da177e4SLinus Torvalds * new address to the association, it MUST return an Error 24081da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 24091da177e4SLinus Torvalds * Due to Resource Shortage'. 24101da177e4SLinus Torvalds */ 24111da177e4SLinus Torvalds 24123f7a87d2SFrank Filz peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_ACTIVE); 24131da177e4SLinus Torvalds if (!peer) 24141da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 24151da177e4SLinus Torvalds 24161da177e4SLinus Torvalds /* Start the heartbeat timer. */ 24171da177e4SLinus Torvalds if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) 24181da177e4SLinus Torvalds sctp_transport_hold(peer); 24191da177e4SLinus Torvalds break; 24201da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 24211da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 24221da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 24231da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 24241da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 24251da177e4SLinus Torvalds */ 24261da177e4SLinus Torvalds pos = asoc->peer.transport_addr_list.next; 24271da177e4SLinus Torvalds if (pos->next == &asoc->peer.transport_addr_list) 24281da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 24291da177e4SLinus Torvalds 24301da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 24311da177e4SLinus Torvalds * address which is also the source address of the IP packet 24321da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 24331da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 24341da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 24351da177e4SLinus Torvalds * Delete Source IP Address' 24361da177e4SLinus Torvalds */ 24371da177e4SLinus Torvalds if (sctp_cmp_addr_exact(sctp_source(asconf), &addr)) 24381da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 24391da177e4SLinus Torvalds 24401da177e4SLinus Torvalds sctp_assoc_del_peer(asoc, &addr); 24411da177e4SLinus Torvalds break; 24421da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 24431da177e4SLinus Torvalds peer = sctp_assoc_lookup_paddr(asoc, &addr); 24441da177e4SLinus Torvalds if (!peer) 24451da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 24461da177e4SLinus Torvalds 24471da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 24481da177e4SLinus Torvalds break; 24491da177e4SLinus Torvalds default: 24501da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 24511da177e4SLinus Torvalds break; 24521da177e4SLinus Torvalds } 24531da177e4SLinus Torvalds 24541da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 24551da177e4SLinus Torvalds } 24561da177e4SLinus Torvalds 24571da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 24581da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 24591da177e4SLinus Torvalds */ 24601da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 24611da177e4SLinus Torvalds struct sctp_chunk *asconf) 24621da177e4SLinus Torvalds { 24631da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 24641da177e4SLinus Torvalds union sctp_addr_param *addr_param; 24651da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 24661da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 24671da177e4SLinus Torvalds 24681da177e4SLinus Torvalds __u16 err_code; 24691da177e4SLinus Torvalds int length = 0; 24701da177e4SLinus Torvalds int chunk_len = asconf->skb->len; 24711da177e4SLinus Torvalds __u32 serial; 24721da177e4SLinus Torvalds int all_param_pass = 1; 24731da177e4SLinus Torvalds 24741da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 24751da177e4SLinus Torvalds serial = ntohl(hdr->serial); 24761da177e4SLinus Torvalds 24771da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 24781da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 24791da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 24801da177e4SLinus Torvalds chunk_len -= length; 24811da177e4SLinus Torvalds 24821da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 24831da177e4SLinus Torvalds * asconf paramter. 24841da177e4SLinus Torvalds */ 24851da177e4SLinus Torvalds length = ntohs(addr_param->v4.param_hdr.length); 24861da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); 24871da177e4SLinus Torvalds chunk_len -= length; 24881da177e4SLinus Torvalds 24891da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 24901da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 24911da177e4SLinus Torvalds * ASCONF_ACK parameters are less than or equal to the twice of ASCONF 24921da177e4SLinus Torvalds * paramters. 24931da177e4SLinus Torvalds */ 24941da177e4SLinus Torvalds asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2); 24951da177e4SLinus Torvalds if (!asconf_ack) 24961da177e4SLinus Torvalds goto done; 24971da177e4SLinus Torvalds 24981da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 24991da177e4SLinus Torvalds while (chunk_len > 0) { 25001da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 25011da177e4SLinus Torvalds asconf_param); 25021da177e4SLinus Torvalds /* ADDIP 4.1 A7) 25031da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 25041da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 25051da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 25061da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 25071da177e4SLinus Torvalds * a specific success indication is present for the parameter. 25081da177e4SLinus Torvalds */ 25091da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR != err_code) 25101da177e4SLinus Torvalds all_param_pass = 0; 25111da177e4SLinus Torvalds 25121da177e4SLinus Torvalds if (!all_param_pass) 25131da177e4SLinus Torvalds sctp_add_asconf_response(asconf_ack, 25141da177e4SLinus Torvalds asconf_param->crr_id, err_code, 25151da177e4SLinus Torvalds asconf_param); 25161da177e4SLinus Torvalds 25171da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 25181da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 25191da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 25201da177e4SLinus Torvalds * in the ASCONF. 25211da177e4SLinus Torvalds */ 25221da177e4SLinus Torvalds if (SCTP_ERROR_RSRC_LOW == err_code) 25231da177e4SLinus Torvalds goto done; 25241da177e4SLinus Torvalds 25251da177e4SLinus Torvalds /* Move to the next ASCONF param. */ 25261da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 25271da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)asconf_param + 25281da177e4SLinus Torvalds length); 25291da177e4SLinus Torvalds chunk_len -= length; 25301da177e4SLinus Torvalds } 25311da177e4SLinus Torvalds 25321da177e4SLinus Torvalds done: 25331da177e4SLinus Torvalds asoc->peer.addip_serial++; 25341da177e4SLinus Torvalds 25351da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 25361da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 25371da177e4SLinus Torvalds */ 25381da177e4SLinus Torvalds if (asconf_ack) { 25391da177e4SLinus Torvalds if (asoc->addip_last_asconf_ack) 25401da177e4SLinus Torvalds sctp_chunk_free(asoc->addip_last_asconf_ack); 25411da177e4SLinus Torvalds 25421da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 25431da177e4SLinus Torvalds asoc->addip_last_asconf_ack = asconf_ack; 25441da177e4SLinus Torvalds } 25451da177e4SLinus Torvalds 25461da177e4SLinus Torvalds return asconf_ack; 25471da177e4SLinus Torvalds } 25481da177e4SLinus Torvalds 25491da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 25501da177e4SLinus Torvalds static int sctp_asconf_param_success(struct sctp_association *asoc, 25511da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 25521da177e4SLinus Torvalds { 25531da177e4SLinus Torvalds struct sctp_af *af; 25541da177e4SLinus Torvalds union sctp_addr addr; 25551da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 25561da177e4SLinus Torvalds union sctp_addr_param *addr_param; 25571da177e4SLinus Torvalds struct list_head *pos; 25581da177e4SLinus Torvalds struct sctp_transport *transport; 25591da177e4SLinus Torvalds int retval = 0; 25601da177e4SLinus Torvalds 25611da177e4SLinus Torvalds addr_param = (union sctp_addr_param *) 25621da177e4SLinus Torvalds ((void *)asconf_param + sizeof(sctp_addip_param_t)); 25631da177e4SLinus Torvalds 25641da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 25651da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); 25661da177e4SLinus Torvalds af->from_addr_param(&addr, addr_param, bp->port, 0); 25671da177e4SLinus Torvalds 25681da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 25691da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 25701da177e4SLinus Torvalds sctp_local_bh_disable(); 25711da177e4SLinus Torvalds sctp_write_lock(&asoc->base.addr_lock); 25721da177e4SLinus Torvalds retval = sctp_add_bind_addr(bp, &addr, GFP_ATOMIC); 25731da177e4SLinus Torvalds sctp_write_unlock(&asoc->base.addr_lock); 25741da177e4SLinus Torvalds sctp_local_bh_enable(); 25751da177e4SLinus Torvalds break; 25761da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 25771da177e4SLinus Torvalds sctp_local_bh_disable(); 25781da177e4SLinus Torvalds sctp_write_lock(&asoc->base.addr_lock); 25791da177e4SLinus Torvalds retval = sctp_del_bind_addr(bp, &addr); 25801da177e4SLinus Torvalds sctp_write_unlock(&asoc->base.addr_lock); 25811da177e4SLinus Torvalds sctp_local_bh_enable(); 25821da177e4SLinus Torvalds list_for_each(pos, &asoc->peer.transport_addr_list) { 25831da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, 25841da177e4SLinus Torvalds transports); 25851da177e4SLinus Torvalds sctp_transport_route(transport, NULL, 25861da177e4SLinus Torvalds sctp_sk(asoc->base.sk)); 25871da177e4SLinus Torvalds } 25881da177e4SLinus Torvalds break; 25891da177e4SLinus Torvalds default: 25901da177e4SLinus Torvalds break; 25911da177e4SLinus Torvalds } 25921da177e4SLinus Torvalds 25931da177e4SLinus Torvalds return retval; 25941da177e4SLinus Torvalds } 25951da177e4SLinus Torvalds 25961da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 25971da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 25981da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 25991da177e4SLinus Torvalds * ADDIP 4.1 26001da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 26011da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 26021da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 26031da177e4SLinus Torvalds * specific success indication is present for the parameter. 26041da177e4SLinus Torvalds */ 26051da177e4SLinus Torvalds static __u16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 26061da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 26071da177e4SLinus Torvalds int no_err) 26081da177e4SLinus Torvalds { 26091da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 26101da177e4SLinus Torvalds sctp_errhdr_t *err_param; 26111da177e4SLinus Torvalds int length; 26121da177e4SLinus Torvalds int asconf_ack_len = asconf_ack->skb->len; 26131da177e4SLinus Torvalds __u16 err_code; 26141da177e4SLinus Torvalds 26151da177e4SLinus Torvalds if (no_err) 26161da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 26171da177e4SLinus Torvalds else 26181da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 26191da177e4SLinus Torvalds 26201da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 26211da177e4SLinus Torvalds * the first asconf_ack parameter. 26221da177e4SLinus Torvalds */ 26231da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 26241da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 26251da177e4SLinus Torvalds length); 26261da177e4SLinus Torvalds asconf_ack_len -= length; 26271da177e4SLinus Torvalds 26281da177e4SLinus Torvalds while (asconf_ack_len > 0) { 26291da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 26301da177e4SLinus Torvalds switch(asconf_ack_param->param_hdr.type) { 26311da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 26321da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 26331da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 26341da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 26351da177e4SLinus Torvalds err_param = (sctp_errhdr_t *) 26361da177e4SLinus Torvalds ((void *)asconf_ack_param + length); 26371da177e4SLinus Torvalds asconf_ack_len -= length; 26381da177e4SLinus Torvalds if (asconf_ack_len > 0) 26391da177e4SLinus Torvalds return err_param->cause; 26401da177e4SLinus Torvalds else 26411da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 26421da177e4SLinus Torvalds break; 26431da177e4SLinus Torvalds default: 26441da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 26451da177e4SLinus Torvalds } 26461da177e4SLinus Torvalds } 26471da177e4SLinus Torvalds 26481da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 26491da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *) 26501da177e4SLinus Torvalds ((void *)asconf_ack_param + length); 26511da177e4SLinus Torvalds asconf_ack_len -= length; 26521da177e4SLinus Torvalds } 26531da177e4SLinus Torvalds 26541da177e4SLinus Torvalds return err_code; 26551da177e4SLinus Torvalds } 26561da177e4SLinus Torvalds 26571da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 26581da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 26591da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 26601da177e4SLinus Torvalds { 26611da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 26621da177e4SLinus Torvalds union sctp_addr_param *addr_param; 26631da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 26641da177e4SLinus Torvalds int length = 0; 26651da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 26661da177e4SLinus Torvalds int all_param_pass = 0; 26671da177e4SLinus Torvalds int no_err = 1; 26681da177e4SLinus Torvalds int retval = 0; 26691da177e4SLinus Torvalds __u16 err_code = SCTP_ERROR_NO_ERROR; 26701da177e4SLinus Torvalds 26711da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 26721da177e4SLinus Torvalds * a pointer to address parameter. 26731da177e4SLinus Torvalds */ 26741da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 26751da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 26761da177e4SLinus Torvalds asconf_len -= length; 26771da177e4SLinus Torvalds 26781da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 26791da177e4SLinus Torvalds * pointer to the first asconf paramter. 26801da177e4SLinus Torvalds */ 26811da177e4SLinus Torvalds length = ntohs(addr_param->v4.param_hdr.length); 26821da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); 26831da177e4SLinus Torvalds asconf_len -= length; 26841da177e4SLinus Torvalds 26851da177e4SLinus Torvalds /* ADDIP 4.1 26861da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 26871da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 26881da177e4SLinus Torvalds * successful. 26891da177e4SLinus Torvalds */ 26901da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 26911da177e4SLinus Torvalds all_param_pass = 1; 26921da177e4SLinus Torvalds 26931da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 26941da177e4SLinus Torvalds while (asconf_len > 0) { 26951da177e4SLinus Torvalds if (all_param_pass) 26961da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 26971da177e4SLinus Torvalds else { 26981da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 26991da177e4SLinus Torvalds asconf_param, 27001da177e4SLinus Torvalds no_err); 27011da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 27021da177e4SLinus Torvalds no_err = 0; 27031da177e4SLinus Torvalds } 27041da177e4SLinus Torvalds 27051da177e4SLinus Torvalds switch (err_code) { 27061da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 27071da177e4SLinus Torvalds retval = sctp_asconf_param_success(asoc, asconf_param); 27081da177e4SLinus Torvalds break; 27091da177e4SLinus Torvalds 27101da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 27111da177e4SLinus Torvalds retval = 1; 27121da177e4SLinus Torvalds break; 27131da177e4SLinus Torvalds 27141da177e4SLinus Torvalds case SCTP_ERROR_INV_PARAM: 27151da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 27161da177e4SLinus Torvalds * future. 27171da177e4SLinus Torvalds */ 27181da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 27191da177e4SLinus Torvalds asconf_param->param_hdr.type; 27201da177e4SLinus Torvalds break; 27211da177e4SLinus Torvalds 27221da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 27231da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 27241da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 27251da177e4SLinus Torvalds default: 27261da177e4SLinus Torvalds break; 27271da177e4SLinus Torvalds } 27281da177e4SLinus Torvalds 27291da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 27301da177e4SLinus Torvalds * one. 27311da177e4SLinus Torvalds */ 27321da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 27331da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)asconf_param + 27341da177e4SLinus Torvalds length); 27351da177e4SLinus Torvalds asconf_len -= length; 27361da177e4SLinus Torvalds } 27371da177e4SLinus Torvalds 27381da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 27391da177e4SLinus Torvalds sctp_chunk_free(asconf); 27401da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 27411da177e4SLinus Torvalds 27421da177e4SLinus Torvalds /* Send the next asconf chunk from the addip chunk queue. */ 274379af02c2SDavid S. Miller if (!list_empty(&asoc->addip_chunk_list)) { 274479af02c2SDavid S. Miller struct list_head *entry = asoc->addip_chunk_list.next; 274579af02c2SDavid S. Miller asconf = list_entry(entry, struct sctp_chunk, list); 274679af02c2SDavid S. Miller 274779af02c2SDavid S. Miller list_del_init(entry); 274879af02c2SDavid S. Miller 27491da177e4SLinus Torvalds /* Hold the chunk until an ASCONF_ACK is received. */ 27501da177e4SLinus Torvalds sctp_chunk_hold(asconf); 27511da177e4SLinus Torvalds if (sctp_primitive_ASCONF(asoc, asconf)) 27521da177e4SLinus Torvalds sctp_chunk_free(asconf); 27531da177e4SLinus Torvalds else 27541da177e4SLinus Torvalds asoc->addip_last_asconf = asconf; 27551da177e4SLinus Torvalds } 27561da177e4SLinus Torvalds 27571da177e4SLinus Torvalds return retval; 27581da177e4SLinus Torvalds } 27591da177e4SLinus Torvalds 27601da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 27611da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 27621da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 27631da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 27641da177e4SLinus Torvalds { 27651da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 27661da177e4SLinus Torvalds struct sctp_fwdtsn_chunk *ftsn_chunk; 27671da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 27681da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 27691da177e4SLinus Torvalds size_t hint; 27701da177e4SLinus Torvalds int i; 27711da177e4SLinus Torvalds 27721da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 27731da177e4SLinus Torvalds 27741da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint); 27751da177e4SLinus Torvalds 27761da177e4SLinus Torvalds if (!retval) 27771da177e4SLinus Torvalds return NULL; 27781da177e4SLinus Torvalds 27791da177e4SLinus Torvalds ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr; 27801da177e4SLinus Torvalds 27811da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 27821da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 27831da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 27841da177e4SLinus Torvalds 27851da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 27861da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 27871da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 27881da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 27891da177e4SLinus Torvalds } 27901da177e4SLinus Torvalds 27911da177e4SLinus Torvalds return retval; 27921da177e4SLinus Torvalds } 2793