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 SCTP_STATIC 691da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 701da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen); 711da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 721da177e4SLinus Torvalds const struct sctp_association *asoc, 731da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 741da177e4SLinus Torvalds int *cookie_len, 751da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 761da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 771da177e4SLinus Torvalds union sctp_params param, 781da177e4SLinus Torvalds const union sctp_addr *peer_addr, 79dd0fc66fSAl Viro gfp_t gfp); 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 821da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 831da177e4SLinus Torvalds { 841da177e4SLinus Torvalds struct sctp_af *af; 851da177e4SLinus Torvalds int iif = 0; 861da177e4SLinus Torvalds 87eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version)); 881da177e4SLinus Torvalds if (af) 891da177e4SLinus Torvalds iif = af->skb_iif(chunk->skb); 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds return iif; 921da177e4SLinus Torvalds } 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 951da177e4SLinus Torvalds * 961da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 971da177e4SLinus Torvalds * Explicit Congestion Notification. 981da177e4SLinus Torvalds */ 991da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1001da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 1011da177e4SLinus Torvalds __constant_htons(sizeof(struct sctp_paramhdr)), 1021da177e4SLinus Torvalds }; 1031da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1041da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 1051da177e4SLinus Torvalds __constant_htons(sizeof(struct sctp_paramhdr)), 1061da177e4SLinus Torvalds }; 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds /* A helper to initialize to initialize an op error inside a 1091da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1101da177e4SLinus Torvalds * abort chunk. 1111da177e4SLinus Torvalds */ 1125bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 11300f1c2dfSWei Yongjun size_t paylen) 1141da177e4SLinus Torvalds { 1151da177e4SLinus Torvalds sctp_errhdr_t err; 1161da177e4SLinus Torvalds __u16 len; 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1191da177e4SLinus Torvalds err.cause = cause_code; 1201da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1211da177e4SLinus Torvalds err.length = htons(len); 1224a1c0107SVlad Yasevich chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1261da177e4SLinus Torvalds * 1271da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1281da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1291da177e4SLinus Torvalds * 1301da177e4SLinus Torvalds * 0 1 2 3 1311da177e4SLinus 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 1321da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1331da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1341da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1351da177e4SLinus Torvalds * | Initiate Tag | 1361da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1371da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1381da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1391da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1401da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1411da177e4SLinus Torvalds * | Initial TSN | 1421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1431da177e4SLinus Torvalds * \ \ 1441da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1451da177e4SLinus Torvalds * \ \ 1461da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1471da177e4SLinus Torvalds * 1481da177e4SLinus Torvalds * 1491da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1501da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1511da177e4SLinus Torvalds * 1521da177e4SLinus Torvalds * Fixed Parameters Status 1531da177e4SLinus Torvalds * ---------------------------------------------- 1541da177e4SLinus Torvalds * Initiate Tag Mandatory 1551da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 1561da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 1571da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 1581da177e4SLinus Torvalds * Initial TSN Mandatory 1591da177e4SLinus Torvalds * 1601da177e4SLinus Torvalds * Variable Parameters Status Type Value 1611da177e4SLinus Torvalds * ------------------------------------------------------------- 1621da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 1631da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 1641da177e4SLinus Torvalds * Cookie Preservative Optional 9 1651da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 1661da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 1671da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 1681da177e4SLinus Torvalds */ 1691da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 1701da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 171dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 1721da177e4SLinus Torvalds { 1731da177e4SLinus Torvalds sctp_inithdr_t init; 1741da177e4SLinus Torvalds union sctp_params addrs; 1751da177e4SLinus Torvalds size_t chunksize; 1761da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 1771da177e4SLinus Torvalds int num_types, addrs_len = 0; 1781da177e4SLinus Torvalds struct sctp_sock *sp; 1791da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 1803dbe8656SAl Viro __be16 types[2]; 1810f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 182131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 183131a47e3SVlad Yasevich int num_ext = 0; 184131a47e3SVlad Yasevich __u8 extensions[3]; 185730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 186730fc3d0SVlad Yasevich *auth_hmacs = NULL; 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1891da177e4SLinus Torvalds * 1901da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 1911da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 1921da177e4SLinus Torvalds */ 1931da177e4SLinus Torvalds retval = NULL; 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 1961da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 1991da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2001da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2011da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2021da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds /* How many address types are needed? */ 2051da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2061da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types); 2091da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 210131a47e3SVlad Yasevich if (sctp_prsctp_enable) { 2111da177e4SLinus Torvalds chunksize += sizeof(prsctp_param); 212131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_FWD_TSN; 213131a47e3SVlad Yasevich num_ext += 1; 214131a47e3SVlad Yasevich } 215131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 216131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 217131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 218131a47e3SVlad Yasevich * INIT-ACK parameters. 219131a47e3SVlad Yasevich */ 220131a47e3SVlad Yasevich if (sctp_addip_enable) { 221131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 222131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 223131a47e3SVlad Yasevich num_ext += 2; 224131a47e3SVlad Yasevich } 225131a47e3SVlad Yasevich 2261da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2271da177e4SLinus Torvalds chunksize += vparam_len; 2281da177e4SLinus Torvalds 229730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 230730fc3d0SVlad Yasevich if (sctp_auth_enable) { 231730fc3d0SVlad Yasevich /* Add random parameter length*/ 232730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 233730fc3d0SVlad Yasevich 234730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 235730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 236730fc3d0SVlad Yasevich if (auth_hmacs->length) 237730fc3d0SVlad Yasevich chunksize += ntohs(auth_hmacs->length); 238730fc3d0SVlad Yasevich else 239730fc3d0SVlad Yasevich auth_hmacs = NULL; 240730fc3d0SVlad Yasevich 241730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 242730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 243730fc3d0SVlad Yasevich if (auth_chunks->length) 244730fc3d0SVlad Yasevich chunksize += ntohs(auth_chunks->length); 245730fc3d0SVlad Yasevich else 246730fc3d0SVlad Yasevich auth_hmacs = NULL; 247730fc3d0SVlad Yasevich 248730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 249730fc3d0SVlad Yasevich num_ext += 1; 250730fc3d0SVlad Yasevich } 251730fc3d0SVlad Yasevich 252131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 253131a47e3SVlad Yasevich if (num_ext) 254131a47e3SVlad Yasevich chunksize += sizeof(sctp_supported_ext_param_t) + num_ext; 255131a47e3SVlad Yasevich 2561da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2571da177e4SLinus Torvalds * 2581da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 2591da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 2601da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 2611da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 2621da177e4SLinus Torvalds * other address types if the Host Name address parameter is 2631da177e4SLinus Torvalds * present in the received INIT chunk. 2641da177e4SLinus Torvalds * 2651da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 2661da177e4SLinus Torvalds */ 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize); 2691da177e4SLinus Torvalds if (!retval) 2701da177e4SLinus Torvalds goto nodata; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds retval->subh.init_hdr = 2731da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 2741da177e4SLinus Torvalds retval->param_hdr.v = 2751da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2781da177e4SLinus Torvalds * 2791da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 2801da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 2811da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 2821da177e4SLinus Torvalds * support any address type. 2831da177e4SLinus Torvalds */ 2841da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 2851da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 2861da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 2871da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 290131a47e3SVlad Yasevich 291131a47e3SVlad Yasevich /* Add the supported extensions paramter. Be nice and add this 292131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 293131a47e3SVlad Yasevich */ 294131a47e3SVlad Yasevich if (num_ext) { 295131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 296131a47e3SVlad Yasevich ext_param.param_hdr.length = 297131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 298131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 299131a47e3SVlad Yasevich &ext_param); 300131a47e3SVlad Yasevich sctp_addto_chunk(retval, num_ext, extensions); 301131a47e3SVlad Yasevich } 302131a47e3SVlad Yasevich 3031da177e4SLinus Torvalds if (sctp_prsctp_enable) 3041da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 305131a47e3SVlad Yasevich 3060f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3071da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3080f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3091da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 310131a47e3SVlad Yasevich 311730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 312730fc3d0SVlad Yasevich if (sctp_auth_enable) { 313730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 314730fc3d0SVlad Yasevich asoc->c.auth_random); 315730fc3d0SVlad Yasevich if (auth_hmacs) 316730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 317730fc3d0SVlad Yasevich auth_hmacs); 318730fc3d0SVlad Yasevich if (auth_chunks) 319730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 320730fc3d0SVlad Yasevich auth_chunks); 321730fc3d0SVlad Yasevich } 3221da177e4SLinus Torvalds nodata: 3231da177e4SLinus Torvalds kfree(addrs.v); 3241da177e4SLinus Torvalds return retval; 3251da177e4SLinus Torvalds } 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3281da177e4SLinus Torvalds const struct sctp_chunk *chunk, 329dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3301da177e4SLinus Torvalds { 3311da177e4SLinus Torvalds sctp_inithdr_t initack; 3321da177e4SLinus Torvalds struct sctp_chunk *retval; 3331da177e4SLinus Torvalds union sctp_params addrs; 3341da177e4SLinus Torvalds int addrs_len; 3351da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3361da177e4SLinus Torvalds int cookie_len; 3371da177e4SLinus Torvalds size_t chunksize; 3380f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 339131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 340131a47e3SVlad Yasevich int num_ext = 0; 341131a47e3SVlad Yasevich __u8 extensions[3]; 342730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 343730fc3d0SVlad Yasevich *auth_hmacs = NULL, 344730fc3d0SVlad Yasevich *auth_random = NULL; 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds retval = NULL; 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 3491da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 3521da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 3531da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 3541da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 3551da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 3581da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 3591da177e4SLinus Torvalds */ 3601da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 3611da177e4SLinus Torvalds addrs.v, addrs_len); 3621da177e4SLinus Torvalds if (!cookie) 3631da177e4SLinus Torvalds goto nomem_cookie; 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 3661da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 3671da177e4SLinus Torvalds */ 3681da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 3711da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 3721da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds /* Tell peer that we'll do PR-SCTP only if peer advertised. */ 375131a47e3SVlad Yasevich if (asoc->peer.prsctp_capable) { 3761da177e4SLinus Torvalds chunksize += sizeof(prsctp_param); 377131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_FWD_TSN; 378131a47e3SVlad Yasevich num_ext += 1; 379131a47e3SVlad Yasevich } 3801da177e4SLinus Torvalds 381131a47e3SVlad Yasevich if (sctp_addip_enable) { 382131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 383131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 384131a47e3SVlad Yasevich num_ext += 2; 385131a47e3SVlad Yasevich } 386131a47e3SVlad Yasevich 387131a47e3SVlad Yasevich chunksize += sizeof(ext_param) + num_ext; 3881da177e4SLinus Torvalds chunksize += sizeof(aiparam); 3891da177e4SLinus Torvalds 390730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 391730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 392730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 393730fc3d0SVlad Yasevich 394730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 395730fc3d0SVlad Yasevich if (auth_hmacs->length) 396730fc3d0SVlad Yasevich chunksize += ntohs(auth_hmacs->length); 397730fc3d0SVlad Yasevich else 398730fc3d0SVlad Yasevich auth_hmacs = NULL; 399730fc3d0SVlad Yasevich 400730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 401730fc3d0SVlad Yasevich if (auth_chunks->length) 402730fc3d0SVlad Yasevich chunksize += ntohs(auth_chunks->length); 403730fc3d0SVlad Yasevich else 404730fc3d0SVlad Yasevich auth_chunks = NULL; 405730fc3d0SVlad Yasevich 406730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 407730fc3d0SVlad Yasevich num_ext += 1; 408730fc3d0SVlad Yasevich } 409730fc3d0SVlad Yasevich 4101da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 4111da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize); 4121da177e4SLinus Torvalds if (!retval) 4131da177e4SLinus Torvalds goto nomem_chunk; 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* Per the advice in RFC 2960 6.4, send this reply to 4161da177e4SLinus Torvalds * the source of the INIT packet. 4171da177e4SLinus Torvalds */ 4181da177e4SLinus Torvalds retval->transport = chunk->transport; 4191da177e4SLinus Torvalds retval->subh.init_hdr = 4201da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4211da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4221da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4231da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4241da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 425131a47e3SVlad Yasevich if (num_ext) { 426131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 427131a47e3SVlad Yasevich ext_param.param_hdr.length = 428131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 429131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 430131a47e3SVlad Yasevich &ext_param); 431131a47e3SVlad Yasevich sctp_addto_chunk(retval, num_ext, extensions); 432131a47e3SVlad Yasevich } 4331da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 4341da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 4351da177e4SLinus Torvalds 4360f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 4371da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 4380f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sctp_sk(asoc->base.sk)->adaptation_ind); 4391da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 4401da177e4SLinus Torvalds 441730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 442730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 443730fc3d0SVlad Yasevich auth_random); 444730fc3d0SVlad Yasevich if (auth_hmacs) 445730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 446730fc3d0SVlad Yasevich auth_hmacs); 447730fc3d0SVlad Yasevich if (auth_chunks) 448730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 449730fc3d0SVlad Yasevich auth_chunks); 450730fc3d0SVlad Yasevich } 451730fc3d0SVlad Yasevich 4521da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 4531da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 4561da177e4SLinus Torvalds * 4571da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 4581da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 4591da177e4SLinus Torvalds * address from which it received the DATA or control chunk 4601da177e4SLinus Torvalds * to which it is replying. 4611da177e4SLinus Torvalds * 4621da177e4SLinus Torvalds * [INIT ACK back to where the INIT came from.] 4631da177e4SLinus Torvalds */ 4641da177e4SLinus Torvalds if (chunk) 4651da177e4SLinus Torvalds retval->transport = chunk->transport; 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds nomem_chunk: 4681da177e4SLinus Torvalds kfree(cookie); 4691da177e4SLinus Torvalds nomem_cookie: 4701da177e4SLinus Torvalds kfree(addrs.v); 4711da177e4SLinus Torvalds return retval; 4721da177e4SLinus Torvalds } 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 4751da177e4SLinus Torvalds * 4761da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 4771da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 4781da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 4791da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 4801da177e4SLinus Torvalds * chunks in the same packet. 4811da177e4SLinus Torvalds * 4821da177e4SLinus Torvalds * 0 1 2 3 4831da177e4SLinus 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 4841da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4851da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 4861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4871da177e4SLinus Torvalds * / Cookie / 4881da177e4SLinus Torvalds * \ \ 4891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4901da177e4SLinus Torvalds * 4911da177e4SLinus Torvalds * Chunk Flags: 8 bit 4921da177e4SLinus Torvalds * 4931da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 4941da177e4SLinus Torvalds * 4951da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 4961da177e4SLinus Torvalds * 4971da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 4981da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 4991da177e4SLinus Torvalds * 5001da177e4SLinus Torvalds * Cookie: variable size 5011da177e4SLinus Torvalds * 5021da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5031da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5041da177e4SLinus Torvalds * 5051da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5061da177e4SLinus Torvalds * to insure interoperability. 5071da177e4SLinus Torvalds */ 5081da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5091da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5101da177e4SLinus Torvalds { 5111da177e4SLinus Torvalds struct sctp_chunk *retval; 5121da177e4SLinus Torvalds void *cookie; 5131da177e4SLinus Torvalds int cookie_len; 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5161da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 5191da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); 5201da177e4SLinus Torvalds if (!retval) 5211da177e4SLinus Torvalds goto nodata; 5221da177e4SLinus Torvalds retval->subh.cookie_hdr = 5231da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5261da177e4SLinus Torvalds * 5271da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5281da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5291da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5301da177e4SLinus Torvalds * to which it is replying. 5311da177e4SLinus Torvalds * 5321da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5331da177e4SLinus Torvalds */ 5341da177e4SLinus Torvalds if (chunk) 5351da177e4SLinus Torvalds retval->transport = chunk->transport; 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds nodata: 5381da177e4SLinus Torvalds return retval; 5391da177e4SLinus Torvalds } 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5421da177e4SLinus Torvalds * 5431da177e4SLinus Torvalds * This chunk is used only during the initialization of an 5441da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 5451da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 5461da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 5471da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 5481da177e4SLinus Torvalds * 5491da177e4SLinus Torvalds * 0 1 2 3 5501da177e4SLinus 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 5511da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5521da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 5531da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5541da177e4SLinus Torvalds * 5551da177e4SLinus Torvalds * Chunk Flags: 8 bits 5561da177e4SLinus Torvalds * 5571da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5581da177e4SLinus Torvalds */ 5591da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 5601da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5611da177e4SLinus Torvalds { 5621da177e4SLinus Torvalds struct sctp_chunk *retval; 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0); 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5671da177e4SLinus Torvalds * 5681da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5691da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5701da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5711da177e4SLinus Torvalds * to which it is replying. 5721da177e4SLinus Torvalds * 5731da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 5741da177e4SLinus Torvalds */ 5751da177e4SLinus Torvalds if (retval && chunk) 5761da177e4SLinus Torvalds retval->transport = chunk->transport; 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds return retval; 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds /* 5821da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 5831da177e4SLinus Torvalds * CWR: 5841da177e4SLinus Torvalds * 5851da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 5861da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 5871da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 5881da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 5891da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 5901da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 5911da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 5921da177e4SLinus Torvalds * CE bit. 5931da177e4SLinus Torvalds * 5941da177e4SLinus Torvalds * 0 1 2 3 5951da177e4SLinus 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 5961da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5971da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 5981da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5991da177e4SLinus Torvalds * | Lowest TSN Number | 6001da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6011da177e4SLinus Torvalds * 6021da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6031da177e4SLinus Torvalds */ 6041da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6051da177e4SLinus Torvalds const __u32 lowest_tsn, 6061da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6071da177e4SLinus Torvalds { 6081da177e4SLinus Torvalds struct sctp_chunk *retval; 6091da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 6121da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0, 6131da177e4SLinus Torvalds sizeof(sctp_cwrhdr_t)); 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds if (!retval) 6161da177e4SLinus Torvalds goto nodata; 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6191da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6221da177e4SLinus Torvalds * 6231da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6241da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6251da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6261da177e4SLinus Torvalds * to which it is replying. 6271da177e4SLinus Torvalds * 6281da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6291da177e4SLinus Torvalds * came from.] 6301da177e4SLinus Torvalds */ 6311da177e4SLinus Torvalds if (chunk) 6321da177e4SLinus Torvalds retval->transport = chunk->transport; 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds nodata: 6351da177e4SLinus Torvalds return retval; 6361da177e4SLinus Torvalds } 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6391da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6401da177e4SLinus Torvalds const __u32 lowest_tsn) 6411da177e4SLinus Torvalds { 6421da177e4SLinus Torvalds struct sctp_chunk *retval; 6431da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 6461da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0, 6471da177e4SLinus Torvalds sizeof(sctp_ecnehdr_t)); 6481da177e4SLinus Torvalds if (!retval) 6491da177e4SLinus Torvalds goto nodata; 6501da177e4SLinus Torvalds retval->subh.ecne_hdr = 6511da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds nodata: 6541da177e4SLinus Torvalds return retval; 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 6581da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 6591da177e4SLinus Torvalds */ 6601da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 6611da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 6621da177e4SLinus Torvalds int data_len, __u8 flags, __u16 ssn) 6631da177e4SLinus Torvalds { 6641da177e4SLinus Torvalds struct sctp_chunk *retval; 6651da177e4SLinus Torvalds struct sctp_datahdr dp; 6661da177e4SLinus Torvalds int chunk_len; 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 6691da177e4SLinus Torvalds * creating the chunk. 6701da177e4SLinus Torvalds */ 6711da177e4SLinus Torvalds dp.tsn = 0; 6721da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 6731da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 676eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 6771da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 6781da177e4SLinus Torvalds dp.ssn = 0; 6791da177e4SLinus Torvalds } else 6801da177e4SLinus Torvalds dp.ssn = htons(ssn); 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 6831da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len); 6841da177e4SLinus Torvalds if (!retval) 6851da177e4SLinus Torvalds goto nodata; 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 6881da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds nodata: 6911da177e4SLinus Torvalds return retval; 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 6951da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 6961da177e4SLinus Torvalds * including duplicates and gaps. 6971da177e4SLinus Torvalds */ 6981da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 6991da177e4SLinus Torvalds { 7001da177e4SLinus Torvalds struct sctp_chunk *retval; 7011da177e4SLinus Torvalds struct sctp_sackhdr sack; 7021da177e4SLinus Torvalds int len; 7031da177e4SLinus Torvalds __u32 ctsn; 7041da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7051da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 7081da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn); 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 7111da177e4SLinus Torvalds num_gabs = sctp_tsnmap_num_gabs(map); 7121da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7131da177e4SLinus Torvalds 7141da177e4SLinus Torvalds /* Initialize the SACK header. */ 7151da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7161da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7171da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7181da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds len = sizeof(sack) 7211da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7221da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds /* Create the chunk. */ 7251da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len); 7261da177e4SLinus Torvalds if (!retval) 7271da177e4SLinus Torvalds goto nodata; 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7301da177e4SLinus Torvalds * 7311da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7321da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7331da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7341da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7351da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7361da177e4SLinus Torvalds * reply chunk. 7371da177e4SLinus Torvalds * 7381da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 7391da177e4SLinus Torvalds * in packets from different source addresses in a single 7401da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 7411da177e4SLinus Torvalds * destination transport addresses from which the DATA or 7421da177e4SLinus Torvalds * control chunks being acknowledged were received. 7431da177e4SLinus Torvalds * 7441da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 7451da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 7461da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 7471da177e4SLinus Torvalds * duplicates. --piggy] 7481da177e4SLinus Torvalds * 7491da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 7501da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 7511da177e4SLinus Torvalds * destination address and not use the source address of the 7521da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 7531da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 7541da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 7551da177e4SLinus Torvalds * for the SACK is broken. 7561da177e4SLinus Torvalds * 7571da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 7581da177e4SLinus Torvalds */ 7591da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds retval->subh.sack_hdr = 7621da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds /* Add the gap ack block information. */ 7651da177e4SLinus Torvalds if (num_gabs) 7661da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 7671da177e4SLinus Torvalds sctp_tsnmap_get_gabs(map)); 7681da177e4SLinus Torvalds 7691da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 7701da177e4SLinus Torvalds if (num_dup_tsns) 7711da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 7721da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds nodata: 7751da177e4SLinus Torvalds return retval; 7761da177e4SLinus Torvalds } 7771da177e4SLinus Torvalds 7781da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 7791da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 7801da177e4SLinus Torvalds const struct sctp_chunk *chunk) 7811da177e4SLinus Torvalds { 7821da177e4SLinus Torvalds struct sctp_chunk *retval; 7831da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 7841da177e4SLinus Torvalds __u32 ctsn; 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 7871da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0, 7901da177e4SLinus Torvalds sizeof(sctp_shutdownhdr_t)); 7911da177e4SLinus Torvalds if (!retval) 7921da177e4SLinus Torvalds goto nodata; 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds retval->subh.shutdown_hdr = 7951da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 7961da177e4SLinus Torvalds 7971da177e4SLinus Torvalds if (chunk) 7981da177e4SLinus Torvalds retval->transport = chunk->transport; 7991da177e4SLinus Torvalds nodata: 8001da177e4SLinus Torvalds return retval; 8011da177e4SLinus Torvalds } 8021da177e4SLinus Torvalds 8031da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8041da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8051da177e4SLinus Torvalds { 8061da177e4SLinus Torvalds struct sctp_chunk *retval; 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8111da177e4SLinus Torvalds * 8121da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8131da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8141da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8151da177e4SLinus Torvalds * to which it is replying. 8161da177e4SLinus Torvalds * 8171da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8181da177e4SLinus Torvalds */ 8191da177e4SLinus Torvalds if (retval && chunk) 8201da177e4SLinus Torvalds retval->transport = chunk->transport; 8211da177e4SLinus Torvalds 8221da177e4SLinus Torvalds return retval; 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 8261da177e4SLinus Torvalds const struct sctp_association *asoc, 8271da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8281da177e4SLinus Torvalds { 8291da177e4SLinus Torvalds struct sctp_chunk *retval; 8301da177e4SLinus Torvalds __u8 flags = 0; 8311da177e4SLinus Torvalds 832047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 833047a2428SJerome Forissier * reflected) 834047a2428SJerome Forissier */ 8351da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); 8381da177e4SLinus Torvalds 8391da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8401da177e4SLinus Torvalds * 8411da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8421da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8431da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8441da177e4SLinus Torvalds * to which it is replying. 8451da177e4SLinus Torvalds * 8461da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 8471da177e4SLinus Torvalds * came from.] 8481da177e4SLinus Torvalds */ 8491da177e4SLinus Torvalds if (retval && chunk) 8501da177e4SLinus Torvalds retval->transport = chunk->transport; 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds return retval; 8531da177e4SLinus Torvalds } 8541da177e4SLinus Torvalds 8551da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 856047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 8571da177e4SLinus Torvalds */ 8581da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 8591da177e4SLinus Torvalds const struct sctp_chunk *chunk, 8601da177e4SLinus Torvalds const size_t hint) 8611da177e4SLinus Torvalds { 8621da177e4SLinus Torvalds struct sctp_chunk *retval; 8631da177e4SLinus Torvalds __u8 flags = 0; 8641da177e4SLinus Torvalds 865047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 866047a2428SJerome Forissier * an INIT (vtag will be reflected). 867047a2428SJerome Forissier */ 868047a2428SJerome Forissier if (!asoc) { 869047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 870047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 871047a2428SJerome Forissier flags = 0; 872047a2428SJerome Forissier else 873047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 874047a2428SJerome Forissier } 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint); 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8791da177e4SLinus Torvalds * 8801da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8811da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8821da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8831da177e4SLinus Torvalds * to which it is replying. 8841da177e4SLinus Torvalds * 8851da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 8861da177e4SLinus Torvalds */ 8871da177e4SLinus Torvalds if (retval && chunk) 8881da177e4SLinus Torvalds retval->transport = chunk->transport; 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds return retval; 8911da177e4SLinus Torvalds } 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 8941da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 8951da177e4SLinus Torvalds const struct sctp_association *asoc, 8961da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 8971da177e4SLinus Torvalds { 8981da177e4SLinus Torvalds struct sctp_chunk *retval; 8999f81bcd9SAl Viro __be32 payload; 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9021da177e4SLinus Torvalds + sizeof(tsn)); 9031da177e4SLinus Torvalds 9041da177e4SLinus Torvalds if (!retval) 9051da177e4SLinus Torvalds goto no_mem; 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9081da177e4SLinus Torvalds payload = htonl(tsn); 90900f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 91000f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9131da177e4SLinus Torvalds * 9141da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9151da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9161da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9171da177e4SLinus Torvalds * to which it is replying. 9181da177e4SLinus Torvalds * 9191da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9201da177e4SLinus Torvalds */ 9211da177e4SLinus Torvalds if (chunk) 9221da177e4SLinus Torvalds retval->transport = chunk->transport; 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds no_mem: 9251da177e4SLinus Torvalds return retval; 9261da177e4SLinus Torvalds } 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 9291da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 930c164a9baSSridhar Samudrala const struct msghdr *msg, 931c164a9baSSridhar Samudrala size_t paylen) 9321da177e4SLinus Torvalds { 9331da177e4SLinus Torvalds struct sctp_chunk *retval; 934c164a9baSSridhar Samudrala void *payload = NULL; 935c164a9baSSridhar Samudrala int err; 9361da177e4SLinus Torvalds 937c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 9381da177e4SLinus Torvalds if (!retval) 9391da177e4SLinus Torvalds goto err_chunk; 9401da177e4SLinus Torvalds 9411da177e4SLinus Torvalds if (paylen) { 9421da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 943c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 9441da177e4SLinus Torvalds if (!payload) 9451da177e4SLinus Torvalds goto err_payload; 9461da177e4SLinus Torvalds 947c164a9baSSridhar Samudrala err = memcpy_fromiovec(payload, msg->msg_iov, paylen); 948c164a9baSSridhar Samudrala if (err < 0) 9491da177e4SLinus Torvalds goto err_copy; 9501da177e4SLinus Torvalds } 9511da177e4SLinus Torvalds 95200f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 95300f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 9541da177e4SLinus Torvalds 9551da177e4SLinus Torvalds if (paylen) 9561da177e4SLinus Torvalds kfree(payload); 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds return retval; 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds err_copy: 9611da177e4SLinus Torvalds kfree(payload); 9621da177e4SLinus Torvalds err_payload: 9631da177e4SLinus Torvalds sctp_chunk_free(retval); 9641da177e4SLinus Torvalds retval = NULL; 9651da177e4SLinus Torvalds err_chunk: 9661da177e4SLinus Torvalds return retval; 9671da177e4SLinus Torvalds } 9681da177e4SLinus Torvalds 9695c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 9705c94bf86SAdrian Bunk * enough. 9715c94bf86SAdrian Bunk */ 9725c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 9735c94bf86SAdrian Bunk const void *data) 9745c94bf86SAdrian Bunk { 9755c94bf86SAdrian Bunk void *target; 9765c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 9775c94bf86SAdrian Bunk 9785c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 9795c94bf86SAdrian Bunk 9805c94bf86SAdrian Bunk memcpy(target, data, len); 9815c94bf86SAdrian Bunk 9825c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 9835c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 9845c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 9855c94bf86SAdrian Bunk 9865c94bf86SAdrian Bunk return target; 9875c94bf86SAdrian Bunk } 9885c94bf86SAdrian Bunk 9891da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 9901da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 9911da177e4SLinus Torvalds const struct sctp_association *asoc, 9921da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9931da177e4SLinus Torvalds const __u8 *payload, 9941da177e4SLinus Torvalds const size_t paylen) 9951da177e4SLinus Torvalds { 9961da177e4SLinus Torvalds struct sctp_chunk *retval; 9971da177e4SLinus Torvalds struct sctp_paramhdr phdr; 9981da177e4SLinus Torvalds 9991da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 100000f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10011da177e4SLinus Torvalds if (!retval) 10021da177e4SLinus Torvalds goto end; 10031da177e4SLinus Torvalds 100400f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 100500f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10061da177e4SLinus Torvalds 10071da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10081da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 100900f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 101000f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 10111da177e4SLinus Torvalds 10121da177e4SLinus Torvalds end: 10131da177e4SLinus Torvalds return retval; 10141da177e4SLinus Torvalds } 10151da177e4SLinus Torvalds 10161da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 10171da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 10181da177e4SLinus Torvalds const struct sctp_transport *transport, 10191da177e4SLinus Torvalds const void *payload, const size_t paylen) 10201da177e4SLinus Torvalds { 10211da177e4SLinus Torvalds struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 10221da177e4SLinus Torvalds 0, paylen); 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds if (!retval) 10251da177e4SLinus Torvalds goto nodata; 10261da177e4SLinus Torvalds 10271da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 10281da177e4SLinus Torvalds * what transport it belongs to. 10291da177e4SLinus Torvalds */ 10301da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 10311da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 10321da177e4SLinus Torvalds 10331da177e4SLinus Torvalds nodata: 10341da177e4SLinus Torvalds return retval; 10351da177e4SLinus Torvalds } 10361da177e4SLinus Torvalds 10371da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 10381da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10391da177e4SLinus Torvalds const void *payload, const size_t paylen) 10401da177e4SLinus Torvalds { 10411da177e4SLinus Torvalds struct sctp_chunk *retval; 10421da177e4SLinus Torvalds 10431da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); 10441da177e4SLinus Torvalds if (!retval) 10451da177e4SLinus Torvalds goto nodata; 10461da177e4SLinus Torvalds 10471da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 10481da177e4SLinus Torvalds 10491da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 10501da177e4SLinus Torvalds * 10511da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 10521da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 10531da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 10541da177e4SLinus Torvalds * to which it is replying. 10551da177e4SLinus Torvalds * 10561da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 10571da177e4SLinus Torvalds */ 10581da177e4SLinus Torvalds if (chunk) 10591da177e4SLinus Torvalds retval->transport = chunk->transport; 10601da177e4SLinus Torvalds 10611da177e4SLinus Torvalds nodata: 10621da177e4SLinus Torvalds return retval; 10631da177e4SLinus Torvalds } 10641da177e4SLinus Torvalds 10651da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 10661da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 10671da177e4SLinus Torvalds */ 10681da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 10691da177e4SLinus Torvalds const struct sctp_association *asoc, 10701da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10711da177e4SLinus Torvalds size_t size) 10721da177e4SLinus Torvalds { 10731da177e4SLinus Torvalds struct sctp_chunk *retval; 10741da177e4SLinus Torvalds 10751da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0, 10761da177e4SLinus Torvalds sizeof(sctp_errhdr_t) + size); 10771da177e4SLinus Torvalds if (!retval) 10781da177e4SLinus Torvalds goto nodata; 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 10811da177e4SLinus Torvalds * 10821da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 10831da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 10841da177e4SLinus Torvalds * address from which it received the DATA or control chunk 10851da177e4SLinus Torvalds * to which it is replying. 10861da177e4SLinus Torvalds * 10871da177e4SLinus Torvalds */ 10881da177e4SLinus Torvalds if (chunk) 10891da177e4SLinus Torvalds retval->transport = chunk->transport; 10901da177e4SLinus Torvalds 10911da177e4SLinus Torvalds nodata: 10921da177e4SLinus Torvalds return retval; 10931da177e4SLinus Torvalds } 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 10961da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 10971da177e4SLinus Torvalds const struct sctp_chunk *chunk, 109863706c5cSAl Viro __be16 cause_code, const void *payload, 10991da177e4SLinus Torvalds size_t paylen) 11001da177e4SLinus Torvalds { 11011da177e4SLinus Torvalds struct sctp_chunk *retval; 11021da177e4SLinus Torvalds 11031da177e4SLinus Torvalds retval = sctp_make_op_error_space(asoc, chunk, paylen); 11041da177e4SLinus Torvalds if (!retval) 11051da177e4SLinus Torvalds goto nodata; 11061da177e4SLinus Torvalds 110700f1c2dfSWei Yongjun sctp_init_cause(retval, cause_code, paylen); 110800f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 11091da177e4SLinus Torvalds 11101da177e4SLinus Torvalds nodata: 11111da177e4SLinus Torvalds return retval; 11121da177e4SLinus Torvalds } 11131da177e4SLinus Torvalds 11141da177e4SLinus Torvalds /******************************************************************** 11151da177e4SLinus Torvalds * 2nd Level Abstractions 11161da177e4SLinus Torvalds ********************************************************************/ 11171da177e4SLinus Torvalds 11181da177e4SLinus Torvalds /* Turn an skb into a chunk. 11191da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 11201da177e4SLinus Torvalds */ 11211da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 11221da177e4SLinus Torvalds const struct sctp_association *asoc, 11231da177e4SLinus Torvalds struct sock *sk) 11241da177e4SLinus Torvalds { 11251da177e4SLinus Torvalds struct sctp_chunk *retval; 11261da177e4SLinus Torvalds 1127c3762229SRobert P. J. Day retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC); 11281da177e4SLinus Torvalds 11291da177e4SLinus Torvalds if (!retval) 11301da177e4SLinus Torvalds goto nodata; 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds if (!sk) { 11331da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb); 11341da177e4SLinus Torvalds } 11351da177e4SLinus Torvalds 113679af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 11371da177e4SLinus Torvalds retval->skb = skb; 11381da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 11391da177e4SLinus Torvalds retval->resent = 0; 11401da177e4SLinus Torvalds retval->has_tsn = 0; 11411da177e4SLinus Torvalds retval->has_ssn = 0; 11421da177e4SLinus Torvalds retval->rtt_in_progress = 0; 11431da177e4SLinus Torvalds retval->sent_at = 0; 11441da177e4SLinus Torvalds retval->singleton = 1; 11451da177e4SLinus Torvalds retval->end_of_packet = 0; 11461da177e4SLinus Torvalds retval->ecn_ce_done = 0; 11471da177e4SLinus Torvalds retval->pdiscard = 0; 11481da177e4SLinus Torvalds 11491da177e4SLinus Torvalds /* sctpimpguide-05.txt Section 2.8.2 11501da177e4SLinus Torvalds * M1) Each time a new DATA chunk is transmitted 11511da177e4SLinus Torvalds * set the 'TSN.Missing.Report' count for that TSN to 0. The 11521da177e4SLinus Torvalds * 'TSN.Missing.Report' count will be used to determine missing chunks 11531da177e4SLinus Torvalds * and when to fast retransmit. 11541da177e4SLinus Torvalds */ 11551da177e4SLinus Torvalds retval->tsn_missing_report = 0; 11561da177e4SLinus Torvalds retval->tsn_gap_acked = 0; 11571da177e4SLinus Torvalds retval->fast_retransmit = 0; 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds /* If this is a fragmented message, track all fragments 11601da177e4SLinus Torvalds * of the message (for SEND_FAILED). 11611da177e4SLinus Torvalds */ 11621da177e4SLinus Torvalds retval->msg = NULL; 11631da177e4SLinus Torvalds 11641da177e4SLinus Torvalds /* Polish the bead hole. */ 11651da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 11661da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 11671da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 11681da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 11691da177e4SLinus Torvalds 11701da177e4SLinus Torvalds nodata: 11711da177e4SLinus Torvalds return retval; 11721da177e4SLinus Torvalds } 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 11751da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 11761da177e4SLinus Torvalds union sctp_addr *dest) 11771da177e4SLinus Torvalds { 1178f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 117916b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 11801da177e4SLinus Torvalds } 11811da177e4SLinus Torvalds 11821da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 11831da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 11841da177e4SLinus Torvalds { 11851da177e4SLinus Torvalds /* If we have a known transport, use that. */ 11861da177e4SLinus Torvalds if (chunk->transport) { 11876a1e5f33SAl Viro return &chunk->transport->ipaddr; 11881da177e4SLinus Torvalds } else { 11891da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 11906a1e5f33SAl Viro return &chunk->source; 11911da177e4SLinus Torvalds } 11921da177e4SLinus Torvalds } 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 11951da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 11961da177e4SLinus Torvalds */ 11971da177e4SLinus Torvalds SCTP_STATIC 11981da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 11991da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen) 12001da177e4SLinus Torvalds { 12011da177e4SLinus Torvalds struct sctp_chunk *retval; 12021da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 12031da177e4SLinus Torvalds struct sk_buff *skb; 12041da177e4SLinus Torvalds struct sock *sk; 12051da177e4SLinus Torvalds 12061da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 12071da177e4SLinus Torvalds skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), 12081da177e4SLinus Torvalds GFP_ATOMIC); 12091da177e4SLinus Torvalds if (!skb) 12101da177e4SLinus Torvalds goto nodata; 12111da177e4SLinus Torvalds 12121da177e4SLinus Torvalds /* Make room for the chunk header. */ 12131da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 12141da177e4SLinus Torvalds chunk_hdr->type = type; 12151da177e4SLinus Torvalds chunk_hdr->flags = flags; 12161da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 12171da177e4SLinus Torvalds 12181da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 12191da177e4SLinus Torvalds retval = sctp_chunkify(skb, asoc, sk); 12201da177e4SLinus Torvalds if (!retval) { 12211da177e4SLinus Torvalds kfree_skb(skb); 12221da177e4SLinus Torvalds goto nodata; 12231da177e4SLinus Torvalds } 12241da177e4SLinus Torvalds 12251da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 12261da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 12271da177e4SLinus Torvalds 12281da177e4SLinus Torvalds /* Set the skb to the belonging sock for accounting. */ 12291da177e4SLinus Torvalds skb->sk = sk; 12301da177e4SLinus Torvalds 12311da177e4SLinus Torvalds return retval; 12321da177e4SLinus Torvalds nodata: 12331da177e4SLinus Torvalds return NULL; 12341da177e4SLinus Torvalds } 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds 12371da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 12381da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 12391da177e4SLinus Torvalds { 12401da177e4SLinus Torvalds /* Free the chunk skb data and the SCTP_chunk stub itself. */ 12411da177e4SLinus Torvalds dev_kfree_skb(chunk->skb); 12421da177e4SLinus Torvalds 12431da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 12441da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 12451da177e4SLinus Torvalds } 12461da177e4SLinus Torvalds 12471da177e4SLinus Torvalds /* Possibly, free the chunk. */ 12481da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 12491da177e4SLinus Torvalds { 125079af02c2SDavid S. Miller BUG_ON(!list_empty(&chunk->list)); 12511da177e4SLinus Torvalds list_del_init(&chunk->transmitted_list); 12521da177e4SLinus Torvalds 12531da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 12541da177e4SLinus Torvalds if (chunk->msg) 12551da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 12561da177e4SLinus Torvalds 12571da177e4SLinus Torvalds sctp_chunk_put(chunk); 12581da177e4SLinus Torvalds } 12591da177e4SLinus Torvalds 12601da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 12611da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 12621da177e4SLinus Torvalds { 12631da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 12641da177e4SLinus Torvalds } 12651da177e4SLinus Torvalds 12661da177e4SLinus Torvalds /* Release a reference to the chunk. */ 12671da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 12681da177e4SLinus Torvalds { 12691da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 12701da177e4SLinus Torvalds sctp_chunk_destroy(ch); 12711da177e4SLinus Torvalds } 12721da177e4SLinus Torvalds 12731da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 12741da177e4SLinus Torvalds * enough. 12751da177e4SLinus Torvalds */ 12761da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 12771da177e4SLinus Torvalds { 12781da177e4SLinus Torvalds void *target; 12791da177e4SLinus Torvalds void *padding; 12801da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 12818d614adeSWei Yongjun int padlen = WORD_ROUND(chunklen) - chunklen; 12821da177e4SLinus Torvalds 12831da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 12841da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 12851da177e4SLinus Torvalds 12861da177e4SLinus Torvalds memset(padding, 0, padlen); 12871da177e4SLinus Torvalds memcpy(target, data, len); 12881da177e4SLinus Torvalds 12891da177e4SLinus Torvalds /* Adjust the chunk length field. */ 12901da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 129127a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 12921da177e4SLinus Torvalds 12931da177e4SLinus Torvalds return target; 12941da177e4SLinus Torvalds } 12951da177e4SLinus Torvalds 12961da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 12971da177e4SLinus Torvalds * chunk is not big enough. 12981da177e4SLinus Torvalds * Returns a kernel err value. 12991da177e4SLinus Torvalds */ 13001da177e4SLinus Torvalds int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 13011da177e4SLinus Torvalds struct iovec *data) 13021da177e4SLinus Torvalds { 13031da177e4SLinus Torvalds __u8 *target; 13041da177e4SLinus Torvalds int err = 0; 13051da177e4SLinus Torvalds 13061da177e4SLinus Torvalds /* Make room in chunk for data. */ 13071da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 13101da177e4SLinus Torvalds if ((err = memcpy_fromiovecend(target, data, off, len))) 13111da177e4SLinus Torvalds goto out; 13121da177e4SLinus Torvalds 13131da177e4SLinus Torvalds /* Adjust the chunk length field. */ 13141da177e4SLinus Torvalds chunk->chunk_hdr->length = 13151da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 131627a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 13171da177e4SLinus Torvalds 13181da177e4SLinus Torvalds out: 13191da177e4SLinus Torvalds return err; 13201da177e4SLinus Torvalds } 13211da177e4SLinus Torvalds 13221da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 13231da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 13241da177e4SLinus Torvalds */ 13251da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 13261da177e4SLinus Torvalds { 1327ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1328ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1329ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 13301da177e4SLinus Torvalds __u16 ssn; 13311da177e4SLinus Torvalds __u16 sid; 13321da177e4SLinus Torvalds 13331da177e4SLinus Torvalds if (chunk->has_ssn) 13341da177e4SLinus Torvalds return; 13351da177e4SLinus Torvalds 1336ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1337ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1338ab3e5e7bSVlad Yasevich stream = &chunk->asoc->ssnmap->out; 1339ab3e5e7bSVlad Yasevich 1340ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1341ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1342ab3e5e7bSVlad Yasevich */ 1343ab3e5e7bSVlad Yasevich msg = chunk->msg; 1344ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1345ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 13461da177e4SLinus Torvalds ssn = 0; 13471da177e4SLinus Torvalds } else { 1348ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1349ab3e5e7bSVlad Yasevich ssn = sctp_ssn_next(stream, sid); 13501da177e4SLinus Torvalds else 1351ab3e5e7bSVlad Yasevich ssn = sctp_ssn_peek(stream, sid); 13521da177e4SLinus Torvalds } 13531da177e4SLinus Torvalds 1354ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1355ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1356ab3e5e7bSVlad Yasevich } 13571da177e4SLinus Torvalds } 13581da177e4SLinus Torvalds 13591da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 13601da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 13611da177e4SLinus Torvalds */ 13621da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 13631da177e4SLinus Torvalds { 13641da177e4SLinus Torvalds if (!chunk->has_tsn) { 13651da177e4SLinus Torvalds /* This is the last possible instant to 13661da177e4SLinus Torvalds * assign a TSN. 13671da177e4SLinus Torvalds */ 13681da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 13691da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 13701da177e4SLinus Torvalds chunk->has_tsn = 1; 13711da177e4SLinus Torvalds } 13721da177e4SLinus Torvalds } 13731da177e4SLinus Torvalds 13741da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 13751da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 13763182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1377dd0fc66fSAl Viro gfp_t gfp) 13781da177e4SLinus Torvalds { 13791da177e4SLinus Torvalds struct sctp_association *asoc; 13801da177e4SLinus Torvalds struct sk_buff *skb; 13811da177e4SLinus Torvalds sctp_scope_t scope; 13821da177e4SLinus Torvalds struct sctp_af *af; 13831da177e4SLinus Torvalds 13841da177e4SLinus Torvalds /* Create the bare association. */ 13851da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 13861da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 13871da177e4SLinus Torvalds if (!asoc) 13881da177e4SLinus Torvalds goto nodata; 13891da177e4SLinus Torvalds asoc->temp = 1; 13901da177e4SLinus Torvalds skb = chunk->skb; 13911da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1392eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); 13931da177e4SLinus Torvalds if (unlikely(!af)) 13941da177e4SLinus Torvalds goto fail; 1395d55c41b1SAl Viro af->from_skb(&asoc->c.peer_addr, skb, 1); 13961da177e4SLinus Torvalds nodata: 13971da177e4SLinus Torvalds return asoc; 13981da177e4SLinus Torvalds 13991da177e4SLinus Torvalds fail: 14001da177e4SLinus Torvalds sctp_association_free(asoc); 14011da177e4SLinus Torvalds return NULL; 14021da177e4SLinus Torvalds } 14031da177e4SLinus Torvalds 14041da177e4SLinus Torvalds /* Build a cookie representing asoc. 14051da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 14061da177e4SLinus Torvalds */ 14071da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 14081da177e4SLinus Torvalds const struct sctp_association *asoc, 14091da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 14101da177e4SLinus Torvalds int *cookie_len, 14111da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 14121da177e4SLinus Torvalds { 14131da177e4SLinus Torvalds sctp_cookie_param_t *retval; 14141da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 14151da177e4SLinus Torvalds struct scatterlist sg; 14161da177e4SLinus Torvalds int headersize, bodysize; 14171da177e4SLinus Torvalds unsigned int keylen; 14181da177e4SLinus Torvalds char *key; 14191da177e4SLinus Torvalds 14209834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 14219834a2bbSVlad Yasevich * any padding. 14229834a2bbSVlad Yasevich */ 14239834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 14249834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 14259834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 14261da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 14271da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 14281da177e4SLinus Torvalds 14291da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 14301da177e4SLinus Torvalds * functions simpler to write. 14311da177e4SLinus Torvalds */ 14321da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 14331da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 14341da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 14351da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 14361da177e4SLinus Torvalds 14371da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 14381da177e4SLinus Torvalds * out on the network. 14391da177e4SLinus Torvalds */ 1440af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1441af997d8cSArnaldo Carvalho de Melo if (!retval) 1442af997d8cSArnaldo Carvalho de Melo goto nodata; 1443af997d8cSArnaldo Carvalho de Melo 14441da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 14451da177e4SLinus Torvalds 14461da177e4SLinus Torvalds /* Set up the parameter header. */ 14471da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 14481da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 14491da177e4SLinus Torvalds 14501da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 14511da177e4SLinus Torvalds cookie->c = asoc->c; 14521da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 14531da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 14541da177e4SLinus Torvalds 14551da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 14561da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 14571da177e4SLinus Torvalds 14580f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 14590f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 14601da177e4SLinus Torvalds 14611da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 14621da177e4SLinus Torvalds do_gettimeofday(&cookie->c.expiration); 14631da177e4SLinus Torvalds TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration); 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds /* Copy the peer's init packet. */ 14661da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 14671da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 14681da177e4SLinus Torvalds 14691da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 14701da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 14711da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 14721da177e4SLinus Torvalds 14731da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 14741b489e11SHerbert Xu struct hash_desc desc; 14751b489e11SHerbert Xu 14761da177e4SLinus Torvalds /* Sign the message. */ 14771da177e4SLinus Torvalds sg.page = virt_to_page(&cookie->c); 14781da177e4SLinus Torvalds sg.offset = (unsigned long)(&cookie->c) % PAGE_SIZE; 14791da177e4SLinus Torvalds sg.length = bodysize; 14801da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 14811da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 14821b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 14831b489e11SHerbert Xu desc.flags = 0; 14841da177e4SLinus Torvalds 14851b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 14861b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) 14871b489e11SHerbert Xu goto free_cookie; 14881da177e4SLinus Torvalds } 14891da177e4SLinus Torvalds 14901da177e4SLinus Torvalds return retval; 14911b489e11SHerbert Xu 14921b489e11SHerbert Xu free_cookie: 14931b489e11SHerbert Xu kfree(retval); 14941b489e11SHerbert Xu nodata: 14951b489e11SHerbert Xu *cookie_len = 0; 14961b489e11SHerbert Xu return NULL; 14971da177e4SLinus Torvalds } 14981da177e4SLinus Torvalds 14991da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 15001da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 15011da177e4SLinus Torvalds const struct sctp_endpoint *ep, 15021da177e4SLinus Torvalds const struct sctp_association *asoc, 1503dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 15041da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 15051da177e4SLinus Torvalds { 15061da177e4SLinus Torvalds struct sctp_association *retval = NULL; 15071da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 15081da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 15091da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1510313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 15111da177e4SLinus Torvalds struct scatterlist sg; 15121da177e4SLinus Torvalds unsigned int keylen, len; 15131da177e4SLinus Torvalds char *key; 15141da177e4SLinus Torvalds sctp_scope_t scope; 15151da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1516a61bbcf2SPatrick McHardy struct timeval tv; 15171b489e11SHerbert Xu struct hash_desc desc; 15181da177e4SLinus Torvalds 15199834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 15209834a2bbSVlad Yasevich * any padding. 15219834a2bbSVlad Yasevich */ 15229834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 15239834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 15249834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 15251da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 15261da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 15271da177e4SLinus Torvalds 15281da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 15291da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 15301da177e4SLinus Torvalds * INIT chunk. 15311da177e4SLinus Torvalds */ 15321da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 15331da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 15341da177e4SLinus Torvalds goto malformed; 15351da177e4SLinus Torvalds 15361da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 15371da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 15381da177e4SLinus Torvalds goto malformed; 15391da177e4SLinus Torvalds 15401da177e4SLinus Torvalds /* Process the cookie. */ 15411da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 15421da177e4SLinus Torvalds bear_cookie = &cookie->c; 15431da177e4SLinus Torvalds 15441da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 15451da177e4SLinus Torvalds goto no_hmac; 15461da177e4SLinus Torvalds 15471da177e4SLinus Torvalds /* Check the signature. */ 15481da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 15491da177e4SLinus Torvalds sg.page = virt_to_page(bear_cookie); 15501da177e4SLinus Torvalds sg.offset = (unsigned long)(bear_cookie) % PAGE_SIZE; 15511da177e4SLinus Torvalds sg.length = bodysize; 15521da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 15531b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 15541b489e11SHerbert Xu desc.flags = 0; 15551da177e4SLinus Torvalds 15568ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 15571b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 15581b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 15591b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 15601b489e11SHerbert Xu goto fail; 15611b489e11SHerbert Xu } 15621da177e4SLinus Torvalds 15631da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 15641da177e4SLinus Torvalds /* Try the previous key. */ 15651da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->last_key]; 15668ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 15671b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 15681b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 15691b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 15701b489e11SHerbert Xu goto fail; 15711b489e11SHerbert Xu } 15721da177e4SLinus Torvalds 15731da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 15741da177e4SLinus Torvalds /* Yikes! Still bad signature! */ 15751da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 15761da177e4SLinus Torvalds goto fail; 15771da177e4SLinus Torvalds } 15781da177e4SLinus Torvalds } 15791da177e4SLinus Torvalds 15801da177e4SLinus Torvalds no_hmac: 15811da177e4SLinus Torvalds /* IG Section 2.35.2: 15821da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 15831da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 15841da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 15851da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 15861da177e4SLinus Torvalds * discarded, 15871da177e4SLinus Torvalds */ 15881da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 15891da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 15901da177e4SLinus Torvalds goto fail; 15911da177e4SLinus Torvalds } 15921da177e4SLinus Torvalds 15939b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 15941da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 15951da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 15961da177e4SLinus Torvalds goto fail; 15971da177e4SLinus Torvalds } 15981da177e4SLinus Torvalds 15991da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 16001da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 16011da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1602f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1603f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1604f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1605f236218bSVlad Yasevich * down the new association establishment instead of every packet. 16061da177e4SLinus Torvalds */ 1607f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 1608a61bbcf2SPatrick McHardy skb_get_timestamp(skb, &tv); 1609f236218bSVlad Yasevich else 1610f236218bSVlad Yasevich do_gettimeofday(&tv); 1611f236218bSVlad Yasevich 1612a61bbcf2SPatrick McHardy if (!asoc && tv_lt(bear_cookie->expiration, tv)) { 16131da177e4SLinus Torvalds /* 16141da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 16151da177e4SLinus Torvalds * 16161da177e4SLinus Torvalds * Cause of error 16171da177e4SLinus Torvalds * --------------- 16181da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 16191da177e4SLinus Torvalds * Cookie that has expired. 16201da177e4SLinus Torvalds */ 16211da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 16221da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 16231da177e4SLinus Torvalds if (*errp) { 1624a61bbcf2SPatrick McHardy suseconds_t usecs = (tv.tv_sec - 16251da177e4SLinus Torvalds bear_cookie->expiration.tv_sec) * 1000000L + 1626a61bbcf2SPatrick McHardy tv.tv_usec - bear_cookie->expiration.tv_usec; 162734bcca28SAl Viro __be32 n = htonl(usecs); 16281da177e4SLinus Torvalds 16291da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 163000f1c2dfSWei Yongjun sizeof(n)); 163100f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 16321da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 16331da177e4SLinus Torvalds } else 16341da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 16351da177e4SLinus Torvalds 16361da177e4SLinus Torvalds goto fail; 16371da177e4SLinus Torvalds } 16381da177e4SLinus Torvalds 16391da177e4SLinus Torvalds /* Make a new base association. */ 16401da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 16411da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 16421da177e4SLinus Torvalds if (!retval) { 16431da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 16441da177e4SLinus Torvalds goto fail; 16451da177e4SLinus Torvalds } 16461da177e4SLinus Torvalds 16471da177e4SLinus Torvalds /* Set up our peer's port number. */ 16481da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 16491da177e4SLinus Torvalds 16501da177e4SLinus Torvalds /* Populate the association from the cookie. */ 16511da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 16521da177e4SLinus Torvalds 16531da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 16541da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 16551da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 16561da177e4SLinus Torvalds goto fail; 16571da177e4SLinus Torvalds } 16581da177e4SLinus Torvalds 16591da177e4SLinus Torvalds /* Also, add the destination address. */ 16601da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 166116b0a030SAl Viro sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1, 16621da177e4SLinus Torvalds GFP_ATOMIC); 16631da177e4SLinus Torvalds } 16641da177e4SLinus Torvalds 16651da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 16661da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 16671da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 16681da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 16691da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 16700f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 16711da177e4SLinus Torvalds 16721da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 16731da177e4SLinus Torvalds return retval; 16741da177e4SLinus Torvalds 16751da177e4SLinus Torvalds fail: 16761da177e4SLinus Torvalds if (retval) 16771da177e4SLinus Torvalds sctp_association_free(retval); 16781da177e4SLinus Torvalds 16791da177e4SLinus Torvalds return NULL; 16801da177e4SLinus Torvalds 16811da177e4SLinus Torvalds malformed: 16821da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 16831da177e4SLinus Torvalds * malformed. 16841da177e4SLinus Torvalds */ 16851da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 16861da177e4SLinus Torvalds goto fail; 16871da177e4SLinus Torvalds } 16881da177e4SLinus Torvalds 16891da177e4SLinus Torvalds /******************************************************************** 16901da177e4SLinus Torvalds * 3rd Level Abstractions 16911da177e4SLinus Torvalds ********************************************************************/ 16921da177e4SLinus Torvalds 16931da177e4SLinus Torvalds struct __sctp_missing { 16949f81bcd9SAl Viro __be32 num_missing; 16959f81bcd9SAl Viro __be16 type; 16961da177e4SLinus Torvalds } __attribute__((packed)); 16971da177e4SLinus Torvalds 16981da177e4SLinus Torvalds /* 16991da177e4SLinus Torvalds * Report a missing mandatory parameter. 17001da177e4SLinus Torvalds */ 17011da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 17021da177e4SLinus Torvalds sctp_param_t paramtype, 17031da177e4SLinus Torvalds struct sctp_chunk *chunk, 17041da177e4SLinus Torvalds struct sctp_chunk **errp) 17051da177e4SLinus Torvalds { 17061da177e4SLinus Torvalds struct __sctp_missing report; 17071da177e4SLinus Torvalds __u16 len; 17081da177e4SLinus Torvalds 17091da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 17101da177e4SLinus Torvalds 17111da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 17121da177e4SLinus Torvalds * returning multiple unknown parameters. 17131da177e4SLinus Torvalds */ 17141da177e4SLinus Torvalds if (!*errp) 17151da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds if (*errp) { 17181da177e4SLinus Torvalds report.num_missing = htonl(1); 17191da177e4SLinus Torvalds report.type = paramtype; 1720ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 172100f1c2dfSWei Yongjun sizeof(report)); 172200f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 17231da177e4SLinus Torvalds } 17241da177e4SLinus Torvalds 17251da177e4SLinus Torvalds /* Stop processing this chunk. */ 17261da177e4SLinus Torvalds return 0; 17271da177e4SLinus Torvalds } 17281da177e4SLinus Torvalds 17291da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 17301da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 17311da177e4SLinus Torvalds struct sctp_chunk *chunk, 17321da177e4SLinus Torvalds struct sctp_chunk **errp) 17331da177e4SLinus Torvalds { 17341da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds if (!*errp) 17371da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 17381da177e4SLinus Torvalds 17391da177e4SLinus Torvalds if (*errp) 174000f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 17411da177e4SLinus Torvalds 17421da177e4SLinus Torvalds /* Stop processing this chunk. */ 17431da177e4SLinus Torvalds return 0; 17441da177e4SLinus Torvalds } 17451da177e4SLinus Torvalds 17461da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 17471da177e4SLinus Torvalds struct sctp_paramhdr *param, 17481da177e4SLinus Torvalds const struct sctp_chunk *chunk, 17491da177e4SLinus Torvalds struct sctp_chunk **errp) 17501da177e4SLinus Torvalds { 17511da177e4SLinus Torvalds char error[] = "The following parameter had invalid length:"; 17521da177e4SLinus Torvalds size_t payload_len = WORD_ROUND(sizeof(error)) + 17531da177e4SLinus Torvalds sizeof(sctp_paramhdr_t); 17541da177e4SLinus Torvalds 17551da177e4SLinus Torvalds 17561da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 17571da177e4SLinus Torvalds if (!*errp) 17581da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, payload_len); 17591da177e4SLinus Torvalds 17601da177e4SLinus Torvalds if (*errp) { 176100f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_PROTO_VIOLATION, 176200f1c2dfSWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 176300f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(error), error); 176400f1c2dfSWei Yongjun sctp_addto_param(*errp, sizeof(sctp_paramhdr_t), param); 17651da177e4SLinus Torvalds } 17661da177e4SLinus Torvalds 17671da177e4SLinus Torvalds return 0; 17681da177e4SLinus Torvalds } 17691da177e4SLinus Torvalds 17701da177e4SLinus Torvalds 17711da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 17721da177e4SLinus Torvalds * send back an indicator to the peer. 17731da177e4SLinus Torvalds */ 17741da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 17751da177e4SLinus Torvalds union sctp_params param, 17761da177e4SLinus Torvalds struct sctp_chunk *chunk, 17771da177e4SLinus Torvalds struct sctp_chunk **errp) 17781da177e4SLinus Torvalds { 17791da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds /* Make an ERROR chunk. */ 17821da177e4SLinus Torvalds if (!*errp) 17831da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 17841da177e4SLinus Torvalds 178500f1c2dfSWei Yongjun if (*errp) { 178600f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 178700f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 178800f1c2dfSWei Yongjun } 17891da177e4SLinus Torvalds 17901da177e4SLinus Torvalds /* Stop processing this chunk. */ 17911da177e4SLinus Torvalds return 0; 17921da177e4SLinus Torvalds } 17931da177e4SLinus Torvalds 1794131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 1795131a47e3SVlad Yasevich union sctp_params param) 1796131a47e3SVlad Yasevich { 1797131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1798131a47e3SVlad Yasevich int i; 1799131a47e3SVlad Yasevich 1800131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 1801131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 1802131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 1803131a47e3SVlad Yasevich if (sctp_prsctp_enable && 1804131a47e3SVlad Yasevich !asoc->peer.prsctp_capable) 1805131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 1806131a47e3SVlad Yasevich break; 1807730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 1808730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 1809730fc3d0SVlad Yasevich * supports AUTH. 1810730fc3d0SVlad Yasevich */ 1811730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 1812730fc3d0SVlad Yasevich break; 1813131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 1814131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1815131a47e3SVlad Yasevich /* don't need to do anything for ASCONF */ 1816131a47e3SVlad Yasevich default: 1817131a47e3SVlad Yasevich break; 1818131a47e3SVlad Yasevich } 1819131a47e3SVlad Yasevich } 1820131a47e3SVlad Yasevich } 1821131a47e3SVlad Yasevich 18221da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 18231da177e4SLinus Torvalds * 18241da177e4SLinus Torvalds * The Parameter Types are encoded such that the 18251da177e4SLinus Torvalds * highest-order two bits specify the action that must be 18261da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 18271da177e4SLinus Torvalds * Parameter Type. 18281da177e4SLinus Torvalds * 18291da177e4SLinus Torvalds * 00 - Stop processing this SCTP chunk and discard it, 18301da177e4SLinus Torvalds * do not process any further chunks within it. 18311da177e4SLinus Torvalds * 18321da177e4SLinus Torvalds * 01 - Stop processing this SCTP chunk and discard it, 18331da177e4SLinus Torvalds * do not process any further chunks within it, and report 18341da177e4SLinus Torvalds * the unrecognized parameter in an 'Unrecognized 18351da177e4SLinus Torvalds * Parameter Type' (in either an ERROR or in the INIT ACK). 18361da177e4SLinus Torvalds * 18371da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 18381da177e4SLinus Torvalds * 18391da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 18401da177e4SLinus Torvalds * report the unrecognized parameter in an 18411da177e4SLinus Torvalds * 'Unrecognized Parameter Type' (in either an ERROR or in 18421da177e4SLinus Torvalds * the INIT ACK). 18431da177e4SLinus Torvalds * 18441da177e4SLinus Torvalds * Return value: 18451da177e4SLinus Torvalds * 0 - discard the chunk 18461da177e4SLinus Torvalds * 1 - continue with the chunk 18471da177e4SLinus Torvalds */ 18481da177e4SLinus Torvalds static int sctp_process_unk_param(const struct sctp_association *asoc, 18491da177e4SLinus Torvalds union sctp_params param, 18501da177e4SLinus Torvalds struct sctp_chunk *chunk, 18511da177e4SLinus Torvalds struct sctp_chunk **errp) 18521da177e4SLinus Torvalds { 18531da177e4SLinus Torvalds int retval = 1; 18541da177e4SLinus Torvalds 18551da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 18561da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 18571da177e4SLinus Torvalds retval = 0; 18581da177e4SLinus Torvalds break; 18591da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD_ERR: 18601da177e4SLinus Torvalds retval = 0; 18611da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 18621da177e4SLinus Torvalds * returning multiple unknown parameters. 18631da177e4SLinus Torvalds */ 18641da177e4SLinus Torvalds if (NULL == *errp) 18651da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 18661da177e4SLinus Torvalds ntohs(chunk->chunk_hdr->length)); 18671da177e4SLinus Torvalds 186800f1c2dfSWei Yongjun if (*errp) { 18691da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, 18701da177e4SLinus Torvalds WORD_ROUND(ntohs(param.p->length))); 187100f1c2dfSWei Yongjun sctp_addto_chunk(*errp, 187200f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 187300f1c2dfSWei Yongjun param.v); 187400f1c2dfSWei Yongjun } 18751da177e4SLinus Torvalds 18761da177e4SLinus Torvalds break; 18771da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 18781da177e4SLinus Torvalds break; 18791da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 18801da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 18811da177e4SLinus Torvalds * returning multiple unknown parameters. 18821da177e4SLinus Torvalds */ 18831da177e4SLinus Torvalds if (NULL == *errp) 18841da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 18851da177e4SLinus Torvalds ntohs(chunk->chunk_hdr->length)); 18861da177e4SLinus Torvalds 18871da177e4SLinus Torvalds if (*errp) { 18881da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, 18891da177e4SLinus Torvalds WORD_ROUND(ntohs(param.p->length))); 189000f1c2dfSWei Yongjun sctp_addto_chunk(*errp, 189100f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 189200f1c2dfSWei Yongjun param.v); 18931da177e4SLinus Torvalds } else { 18941da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 18951da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 18961da177e4SLinus Torvalds * to the peer and the association won't be 18971da177e4SLinus Torvalds * established. 18981da177e4SLinus Torvalds */ 18991da177e4SLinus Torvalds retval = 0; 19001da177e4SLinus Torvalds } 19011da177e4SLinus Torvalds 19021da177e4SLinus Torvalds break; 19031da177e4SLinus Torvalds default: 19041da177e4SLinus Torvalds break; 19051da177e4SLinus Torvalds } 19061da177e4SLinus Torvalds 19071da177e4SLinus Torvalds return retval; 19081da177e4SLinus Torvalds } 19091da177e4SLinus Torvalds 19101da177e4SLinus Torvalds /* Find unrecognized parameters in the chunk. 19111da177e4SLinus Torvalds * Return values: 19121da177e4SLinus Torvalds * 0 - discard the chunk 19131da177e4SLinus Torvalds * 1 - continue with the chunk 19141da177e4SLinus Torvalds */ 19151da177e4SLinus Torvalds static int sctp_verify_param(const struct sctp_association *asoc, 19161da177e4SLinus Torvalds union sctp_params param, 19171da177e4SLinus Torvalds sctp_cid_t cid, 19181da177e4SLinus Torvalds struct sctp_chunk *chunk, 19191da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 19201da177e4SLinus Torvalds { 19211da177e4SLinus Torvalds int retval = 1; 19221da177e4SLinus Torvalds 19231da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 19241da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 19251da177e4SLinus Torvalds * identified based on the chunk id. 19261da177e4SLinus Torvalds */ 19271da177e4SLinus Torvalds 19281da177e4SLinus Torvalds switch (param.p->type) { 19291da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 19301da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 19311da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 19321da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 19331da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 19341da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 19351da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 19361da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 19370f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 1938131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 19391da177e4SLinus Torvalds break; 19401da177e4SLinus Torvalds 19411da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 19421da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 19431da177e4SLinus Torvalds return sctp_process_hn_param(asoc, param, chunk, err_chunk); 1944131a47e3SVlad Yasevich 19451da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 19461da177e4SLinus Torvalds if (sctp_prsctp_enable) 19471da177e4SLinus Torvalds break; 1948730fc3d0SVlad Yasevich goto fallthrough; 1949730fc3d0SVlad Yasevich 1950730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 1951730fc3d0SVlad Yasevich if (!sctp_auth_enable) 1952730fc3d0SVlad Yasevich goto fallthrough; 1953730fc3d0SVlad Yasevich 1954730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 1955730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 1956730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 1957730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 1958730fc3d0SVlad Yasevich */ 1959730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 1960730fc3d0SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) 1961730fc3d0SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, 1962730fc3d0SVlad Yasevich chunk, err_chunk); 1963730fc3d0SVlad Yasevich break; 1964730fc3d0SVlad Yasevich 1965730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 1966730fc3d0SVlad Yasevich if (!sctp_auth_enable) 1967730fc3d0SVlad Yasevich goto fallthrough; 1968730fc3d0SVlad Yasevich 1969730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 1970730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 1971730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 1972730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 1973730fc3d0SVlad Yasevich */ 1974730fc3d0SVlad Yasevich if (260 < ntohs(param.p->length)) 1975730fc3d0SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, 1976730fc3d0SVlad Yasevich chunk, err_chunk); 1977730fc3d0SVlad Yasevich break; 1978730fc3d0SVlad Yasevich 1979730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 1980730fc3d0SVlad Yasevich if (!sctp_auth_enable) 1981730fc3d0SVlad Yasevich break; 19821da177e4SLinus Torvalds /* Fall Through */ 1983730fc3d0SVlad Yasevich fallthrough: 19841da177e4SLinus Torvalds default: 19851da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n", 19861da177e4SLinus Torvalds ntohs(param.p->type), cid); 19871da177e4SLinus Torvalds return sctp_process_unk_param(asoc, param, chunk, err_chunk); 19881da177e4SLinus Torvalds 19891da177e4SLinus Torvalds break; 19901da177e4SLinus Torvalds } 19911da177e4SLinus Torvalds return retval; 19921da177e4SLinus Torvalds } 19931da177e4SLinus Torvalds 19941da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 19951da177e4SLinus Torvalds int sctp_verify_init(const struct sctp_association *asoc, 19961da177e4SLinus Torvalds sctp_cid_t cid, 19971da177e4SLinus Torvalds sctp_init_chunk_t *peer_init, 19981da177e4SLinus Torvalds struct sctp_chunk *chunk, 19991da177e4SLinus Torvalds struct sctp_chunk **errp) 20001da177e4SLinus Torvalds { 20011da177e4SLinus Torvalds union sctp_params param; 20021da177e4SLinus Torvalds int has_cookie = 0; 20031da177e4SLinus Torvalds 20041da177e4SLinus Torvalds /* Verify stream values are non-zero. */ 20051da177e4SLinus Torvalds if ((0 == peer_init->init_hdr.num_outbound_streams) || 2006d023f629SVlad Yasevich (0 == peer_init->init_hdr.num_inbound_streams) || 2007d023f629SVlad Yasevich (0 == peer_init->init_hdr.init_tag) || 2008d023f629SVlad Yasevich (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) { 20091da177e4SLinus Torvalds 20101da177e4SLinus Torvalds sctp_process_inv_mandatory(asoc, chunk, errp); 20111da177e4SLinus Torvalds return 0; 20121da177e4SLinus Torvalds } 20131da177e4SLinus Torvalds 20141da177e4SLinus Torvalds /* Check for missing mandatory parameters. */ 20151da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 20161da177e4SLinus Torvalds 20171da177e4SLinus Torvalds if (SCTP_PARAM_STATE_COOKIE == param.p->type) 20181da177e4SLinus Torvalds has_cookie = 1; 20191da177e4SLinus Torvalds 20201da177e4SLinus Torvalds } /* for (loop through all parameters) */ 20211da177e4SLinus Torvalds 20221da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 20231da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 20241da177e4SLinus Torvalds * The current param.p would point at the bad one. 20251da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 20261da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 20271da177e4SLinus Torvalds * error handling code build and send the packet. 20281da177e4SLinus Torvalds */ 2029cb243a1aSWei Yongjun if (param.v != (void*)chunk->chunk_end) { 20301da177e4SLinus Torvalds sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 20311da177e4SLinus Torvalds return 0; 20321da177e4SLinus Torvalds } 20331da177e4SLinus Torvalds 20341da177e4SLinus Torvalds /* The only missing mandatory param possible today is 20351da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 20361da177e4SLinus Torvalds */ 20371da177e4SLinus Torvalds if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) { 20381da177e4SLinus Torvalds sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 20391da177e4SLinus Torvalds chunk, errp); 20401da177e4SLinus Torvalds return 0; 20411da177e4SLinus Torvalds } 20421da177e4SLinus Torvalds 20431da177e4SLinus Torvalds /* Find unrecognized parameters. */ 20441da177e4SLinus Torvalds 20451da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 20461da177e4SLinus Torvalds 20471da177e4SLinus Torvalds if (!sctp_verify_param(asoc, param, cid, chunk, errp)) { 20481da177e4SLinus Torvalds if (SCTP_PARAM_HOST_NAME_ADDRESS == param.p->type) 20491da177e4SLinus Torvalds return 0; 20501da177e4SLinus Torvalds else 20511da177e4SLinus Torvalds return 1; 20521da177e4SLinus Torvalds } 20531da177e4SLinus Torvalds 20541da177e4SLinus Torvalds } /* for (loop through all parameters) */ 20551da177e4SLinus Torvalds 20561da177e4SLinus Torvalds return 1; 20571da177e4SLinus Torvalds } 20581da177e4SLinus Torvalds 20591da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 20601da177e4SLinus Torvalds * Returns 0 on failure, else success. 20611da177e4SLinus Torvalds * FIXME: This is an association method. 20621da177e4SLinus Torvalds */ 20631da177e4SLinus Torvalds int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid, 20641da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2065dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 20661da177e4SLinus Torvalds { 20671da177e4SLinus Torvalds union sctp_params param; 20681da177e4SLinus Torvalds struct sctp_transport *transport; 20691da177e4SLinus Torvalds struct list_head *pos, *temp; 20701da177e4SLinus Torvalds char *cookie; 20711da177e4SLinus Torvalds 20721da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 20731da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 20741da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 20751da177e4SLinus Torvalds * of the INIT from the cookie. 20761da177e4SLinus Torvalds */ 20771da177e4SLinus Torvalds 20781da177e4SLinus Torvalds /* This implementation defaults to making the first transport 20791da177e4SLinus Torvalds * added as the primary transport. The source address seems to 20801da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 20811da177e4SLinus Torvalds */ 20824bdf4b5fSAl Viro if (peer_addr) { 20836a1e5f33SAl Viro if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 20841da177e4SLinus Torvalds goto nomem; 20854bdf4b5fSAl Viro } 20861da177e4SLinus Torvalds 20871da177e4SLinus Torvalds /* Process the initialization parameters. */ 20881da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 20891da177e4SLinus Torvalds 20901da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 20911da177e4SLinus Torvalds goto clean_up; 20921da177e4SLinus Torvalds } 20931da177e4SLinus Torvalds 2094730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2095730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2096730fc3d0SVlad Yasevich */ 2097730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2098730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2099730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2100730fc3d0SVlad Yasevich 21013f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 21023f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 21033f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 21043f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 21053f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 21063f7a87d2SFrank Filz } 21073f7a87d2SFrank Filz } 21083f7a87d2SFrank Filz 21091da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 21101da177e4SLinus Torvalds * order. 21111da177e4SLinus Torvalds */ 21121da177e4SLinus Torvalds asoc->peer.i.init_tag = 21131da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 21141da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 21151da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 21161da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 21171da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 21181da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 21191da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 21201da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 21211da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 21221da177e4SLinus Torvalds 21231da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 21241da177e4SLinus Torvalds * number of inbound streams. 21251da177e4SLinus Torvalds */ 21261da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 21271da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 21281da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 21291da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 21301da177e4SLinus Torvalds } 21311da177e4SLinus Torvalds 21321da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 21331da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 21341da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 21351da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 21361da177e4SLinus Torvalds } 21371da177e4SLinus Torvalds 21381da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 21391da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 21401da177e4SLinus Torvalds 21411da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 21421da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 21431da177e4SLinus Torvalds 21441da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 21451da177e4SLinus Torvalds cookie = asoc->peer.cookie; 21461da177e4SLinus Torvalds if (cookie) { 2147af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 21481da177e4SLinus Torvalds if (!asoc->peer.cookie) 21491da177e4SLinus Torvalds goto clean_up; 21501da177e4SLinus Torvalds } 21511da177e4SLinus Torvalds 21521da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 21531da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 21541da177e4SLinus Torvalds * advertised window). 21551da177e4SLinus Torvalds */ 21561da177e4SLinus Torvalds list_for_each(pos, &asoc->peer.transport_addr_list) { 21571da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 21581da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 21591da177e4SLinus Torvalds } 21601da177e4SLinus Torvalds 21611da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 21621da177e4SLinus Torvalds sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE, 21631da177e4SLinus Torvalds asoc->peer.i.initial_tsn); 21641da177e4SLinus Torvalds 21651da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 21661da177e4SLinus Torvalds * 21671da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 21681da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 21691da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 21701da177e4SLinus Torvalds * stream sequence number shall be set to 0. 21711da177e4SLinus Torvalds */ 21721da177e4SLinus Torvalds 21733f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 21743f7a87d2SFrank Filz * association. 21751da177e4SLinus Torvalds */ 21761da177e4SLinus Torvalds if (!asoc->temp) { 21771da177e4SLinus Torvalds int error; 21781da177e4SLinus Torvalds 21791da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 21801da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 21811da177e4SLinus Torvalds if (!asoc->ssnmap) 21821da177e4SLinus Torvalds goto clean_up; 21831da177e4SLinus Torvalds 218407d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 218507d93967SVlad Yasevich if (error) 21861da177e4SLinus Torvalds goto clean_up; 21871da177e4SLinus Torvalds } 21881da177e4SLinus Torvalds 21891da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 21901da177e4SLinus Torvalds * 21911da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 21921da177e4SLinus Torvalds * remote endpoint it should do the following: 21931da177e4SLinus Torvalds * ... 21941da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 21951da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 21961da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 21971da177e4SLinus Torvalds * association to the same value as the Initial TSN. 21981da177e4SLinus Torvalds */ 21991da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 22001da177e4SLinus Torvalds return 1; 22011da177e4SLinus Torvalds 22021da177e4SLinus Torvalds clean_up: 22031da177e4SLinus Torvalds /* Release the transport structures. */ 22041da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 22051da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 22061da177e4SLinus Torvalds list_del_init(pos); 22071da177e4SLinus Torvalds sctp_transport_free(transport); 22081da177e4SLinus Torvalds } 22093f7a87d2SFrank Filz 22103f7a87d2SFrank Filz asoc->peer.transport_count = 0; 22113f7a87d2SFrank Filz 22121da177e4SLinus Torvalds nomem: 22131da177e4SLinus Torvalds return 0; 22141da177e4SLinus Torvalds } 22151da177e4SLinus Torvalds 22161da177e4SLinus Torvalds 22171da177e4SLinus Torvalds /* Update asoc with the option described in param. 22181da177e4SLinus Torvalds * 22191da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 22201da177e4SLinus Torvalds * 22211da177e4SLinus Torvalds * asoc is the association to update. 22221da177e4SLinus Torvalds * param is the variable length parameter to use for update. 22231da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 22241da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 22251da177e4SLinus Torvalds * work we do. In particular, we should not build transport 22261da177e4SLinus Torvalds * structures for the addresses. 22271da177e4SLinus Torvalds */ 22281da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 22291da177e4SLinus Torvalds union sctp_params param, 22301da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2231dd0fc66fSAl Viro gfp_t gfp) 22321da177e4SLinus Torvalds { 22331da177e4SLinus Torvalds union sctp_addr addr; 22341da177e4SLinus Torvalds int i; 22351da177e4SLinus Torvalds __u16 sat; 22361da177e4SLinus Torvalds int retval = 1; 22371da177e4SLinus Torvalds sctp_scope_t scope; 22381da177e4SLinus Torvalds time_t stale; 22391da177e4SLinus Torvalds struct sctp_af *af; 22401da177e4SLinus Torvalds 22411da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 22421da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 22431da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 22441da177e4SLinus Torvalds */ 22451da177e4SLinus Torvalds switch (param.p->type) { 22461da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 22471da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 22481da177e4SLinus Torvalds break; 22491da177e4SLinus Torvalds /* Fall through. */ 22501da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 22511da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2252dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 22531da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2254dd86d136SAl Viro if (sctp_in_scope(&addr, scope)) 2255dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 22561da177e4SLinus Torvalds return 0; 22571da177e4SLinus Torvalds break; 22581da177e4SLinus Torvalds 22591da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 22601da177e4SLinus Torvalds if (!sctp_cookie_preserve_enable) 22611da177e4SLinus Torvalds break; 22621da177e4SLinus Torvalds 22631da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 22641da177e4SLinus Torvalds 22651da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 22661da177e4SLinus Torvalds * (1/1000sec). 22671da177e4SLinus Torvalds */ 22681da177e4SLinus Torvalds asoc->cookie_life.tv_sec += stale / 1000; 22691da177e4SLinus Torvalds asoc->cookie_life.tv_usec += (stale % 1000) * 1000; 22701da177e4SLinus Torvalds break; 22711da177e4SLinus Torvalds 22721da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 22731da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n"); 22741da177e4SLinus Torvalds break; 22751da177e4SLinus Torvalds 22761da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 22771da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 22781da177e4SLinus Torvalds * ones are really set by the peer. 22791da177e4SLinus Torvalds */ 22801da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 22811da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 22821da177e4SLinus Torvalds 22831da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 22841da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 22851da177e4SLinus Torvalds if (sat) 22861da177e4SLinus Torvalds sat /= sizeof(__u16); 22871da177e4SLinus Torvalds 22881da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 22891da177e4SLinus Torvalds switch (param.sat->types[i]) { 22901da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 22911da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 22921da177e4SLinus Torvalds break; 22931da177e4SLinus Torvalds 22941da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 22951da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 22961da177e4SLinus Torvalds break; 22971da177e4SLinus Torvalds 22981da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 22991da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 23001da177e4SLinus Torvalds break; 23011da177e4SLinus Torvalds 23021da177e4SLinus Torvalds default: /* Just ignore anything else. */ 23031da177e4SLinus Torvalds break; 23043ff50b79SStephen Hemminger } 23051da177e4SLinus Torvalds } 23061da177e4SLinus Torvalds break; 23071da177e4SLinus Torvalds 23081da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 23091da177e4SLinus Torvalds asoc->peer.cookie_len = 23101da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 23111da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 23121da177e4SLinus Torvalds break; 23131da177e4SLinus Torvalds 23141da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 23151da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 23161da177e4SLinus Torvalds break; 23171da177e4SLinus Torvalds 23181da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 23191da177e4SLinus Torvalds /* Rejected during verify stage. */ 23201da177e4SLinus Torvalds break; 23211da177e4SLinus Torvalds 23221da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 23231da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 23241da177e4SLinus Torvalds break; 23251da177e4SLinus Torvalds 23260f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 23270f3fffd8SIvan Skytte Jorgensen asoc->peer.adaptation_ind = param.aind->adaptation_ind; 23281da177e4SLinus Torvalds break; 23291da177e4SLinus Torvalds 2330131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2331131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2332131a47e3SVlad Yasevich break; 2333131a47e3SVlad Yasevich 23341da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 23351da177e4SLinus Torvalds if (sctp_prsctp_enable) { 23361da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 23371da177e4SLinus Torvalds break; 23381da177e4SLinus Torvalds } 23391da177e4SLinus Torvalds /* Fall Through */ 2340730fc3d0SVlad Yasevich goto fall_through; 2341730fc3d0SVlad Yasevich 2342730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2343730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2344730fc3d0SVlad Yasevich goto fall_through; 2345730fc3d0SVlad Yasevich 2346730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2347730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2348730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2349730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2350730fc3d0SVlad Yasevich retval = 0; 2351730fc3d0SVlad Yasevich break; 2352730fc3d0SVlad Yasevich } 2353730fc3d0SVlad Yasevich break; 2354730fc3d0SVlad Yasevich 2355730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2356730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2357730fc3d0SVlad Yasevich goto fall_through; 2358730fc3d0SVlad Yasevich 2359730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2360730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2361730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2362730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2363730fc3d0SVlad Yasevich retval = 0; 2364730fc3d0SVlad Yasevich break; 2365730fc3d0SVlad Yasevich } 2366730fc3d0SVlad Yasevich 2367730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2368730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2369730fc3d0SVlad Yasevich break; 2370730fc3d0SVlad Yasevich 2371730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2372730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2373730fc3d0SVlad Yasevich goto fall_through; 2374730fc3d0SVlad Yasevich 2375730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2376730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2377730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2378730fc3d0SVlad Yasevich retval = 0; 2379730fc3d0SVlad Yasevich break; 2380730fc3d0SVlad Yasevich fall_through: 23811da177e4SLinus Torvalds default: 23821da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 23831da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 23841da177e4SLinus Torvalds * called prior to this routine. Simply log the error 23851da177e4SLinus Torvalds * here. 23861da177e4SLinus Torvalds */ 23871da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n", 23881da177e4SLinus Torvalds ntohs(param.p->type), asoc); 23891da177e4SLinus Torvalds break; 23903ff50b79SStephen Hemminger } 23911da177e4SLinus Torvalds 23921da177e4SLinus Torvalds return retval; 23931da177e4SLinus Torvalds } 23941da177e4SLinus Torvalds 23951da177e4SLinus Torvalds /* Select a new verification tag. */ 23961da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 23971da177e4SLinus Torvalds { 23981da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 23991da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 24001da177e4SLinus Torvalds */ 24011da177e4SLinus Torvalds __u32 x; 24021da177e4SLinus Torvalds 24031da177e4SLinus Torvalds do { 24041da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 24051da177e4SLinus Torvalds } while (x == 0); 24061da177e4SLinus Torvalds 24071da177e4SLinus Torvalds return x; 24081da177e4SLinus Torvalds } 24091da177e4SLinus Torvalds 24101da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 24111da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 24121da177e4SLinus Torvalds { 24131da177e4SLinus Torvalds __u32 retval; 24141da177e4SLinus Torvalds 24151da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 24161da177e4SLinus Torvalds return retval; 24171da177e4SLinus Torvalds } 24181da177e4SLinus Torvalds 24191da177e4SLinus Torvalds /* 24201da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 24211da177e4SLinus Torvalds * 0 1 2 3 24221da177e4SLinus 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 24231da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24241da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 24251da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24261da177e4SLinus Torvalds * | Serial Number | 24271da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24281da177e4SLinus Torvalds * | Address Parameter | 24291da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24301da177e4SLinus Torvalds * | ASCONF Parameter #1 | 24311da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24321da177e4SLinus Torvalds * \ \ 24331da177e4SLinus Torvalds * / .... / 24341da177e4SLinus Torvalds * \ \ 24351da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24361da177e4SLinus Torvalds * | ASCONF Parameter #N | 24371da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24381da177e4SLinus Torvalds * 24391da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 24401da177e4SLinus Torvalds */ 24411da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 24421da177e4SLinus Torvalds union sctp_addr *addr, 24431da177e4SLinus Torvalds int vparam_len) 24441da177e4SLinus Torvalds { 24451da177e4SLinus Torvalds sctp_addiphdr_t asconf; 24461da177e4SLinus Torvalds struct sctp_chunk *retval; 24471da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 24481da177e4SLinus Torvalds union sctp_addr_param addrparam; 24491da177e4SLinus Torvalds int addrlen; 24501da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 24511da177e4SLinus Torvalds 24521da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 24531da177e4SLinus Torvalds if (!addrlen) 24541da177e4SLinus Torvalds return NULL; 24551da177e4SLinus Torvalds length += addrlen; 24561da177e4SLinus Torvalds 24571da177e4SLinus Torvalds /* Create the chunk. */ 24581da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length); 24591da177e4SLinus Torvalds if (!retval) 24601da177e4SLinus Torvalds return NULL; 24611da177e4SLinus Torvalds 24621da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 24631da177e4SLinus Torvalds 24641da177e4SLinus Torvalds retval->subh.addip_hdr = 24651da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 24661da177e4SLinus Torvalds retval->param_hdr.v = 24671da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 24681da177e4SLinus Torvalds 24691da177e4SLinus Torvalds return retval; 24701da177e4SLinus Torvalds } 24711da177e4SLinus Torvalds 24721da177e4SLinus Torvalds /* ADDIP 24731da177e4SLinus Torvalds * 3.2.1 Add IP Address 24741da177e4SLinus Torvalds * 0 1 2 3 24751da177e4SLinus 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 24761da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24771da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 24781da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24791da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 24801da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24811da177e4SLinus Torvalds * | Address Parameter | 24821da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24831da177e4SLinus Torvalds * 24841da177e4SLinus Torvalds * 3.2.2 Delete IP Address 24851da177e4SLinus Torvalds * 0 1 2 3 24861da177e4SLinus 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 24871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24881da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 24891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24901da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 24911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24921da177e4SLinus Torvalds * | Address Parameter | 24931da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 24941da177e4SLinus Torvalds * 24951da177e4SLinus Torvalds */ 24961da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 24971da177e4SLinus Torvalds union sctp_addr *laddr, 24981da177e4SLinus Torvalds struct sockaddr *addrs, 24991da177e4SLinus Torvalds int addrcnt, 2500dbc16db1SAl Viro __be16 flags) 25011da177e4SLinus Torvalds { 25021da177e4SLinus Torvalds sctp_addip_param_t param; 25031da177e4SLinus Torvalds struct sctp_chunk *retval; 25041da177e4SLinus Torvalds union sctp_addr_param addr_param; 25051da177e4SLinus Torvalds union sctp_addr *addr; 25061da177e4SLinus Torvalds void *addr_buf; 25071da177e4SLinus Torvalds struct sctp_af *af; 25081da177e4SLinus Torvalds int paramlen = sizeof(param); 25091da177e4SLinus Torvalds int addr_param_len = 0; 25101da177e4SLinus Torvalds int totallen = 0; 25111da177e4SLinus Torvalds int i; 25121da177e4SLinus Torvalds 25131da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 25141da177e4SLinus Torvalds addr_buf = addrs; 25151da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 25161da177e4SLinus Torvalds addr = (union sctp_addr *)addr_buf; 25171da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 25181da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 25191da177e4SLinus Torvalds 25201da177e4SLinus Torvalds totallen += paramlen; 25211da177e4SLinus Torvalds totallen += addr_param_len; 25221da177e4SLinus Torvalds 25231da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 25241da177e4SLinus Torvalds } 25251da177e4SLinus Torvalds 25261da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 25271da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 25281da177e4SLinus Torvalds if (!retval) 25291da177e4SLinus Torvalds return NULL; 25301da177e4SLinus Torvalds 25311da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 25321da177e4SLinus Torvalds addr_buf = addrs; 25331da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 25341da177e4SLinus Torvalds addr = (union sctp_addr *)addr_buf; 25351da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 25361da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 25371da177e4SLinus Torvalds param.param_hdr.type = flags; 25381da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 25391da177e4SLinus Torvalds param.crr_id = i; 25401da177e4SLinus Torvalds 25411da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 25421da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 25431da177e4SLinus Torvalds 25441da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 25451da177e4SLinus Torvalds } 25461da177e4SLinus Torvalds return retval; 25471da177e4SLinus Torvalds } 25481da177e4SLinus Torvalds 25491da177e4SLinus Torvalds /* ADDIP 25501da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 25511da177e4SLinus Torvalds * 0 1 2 3 25521da177e4SLinus 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 25531da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25541da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 25551da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25561da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 25571da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25581da177e4SLinus Torvalds * | Address Parameter | 25591da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25601da177e4SLinus Torvalds * 25611da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 25621da177e4SLinus Torvalds */ 25631da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 25641da177e4SLinus Torvalds union sctp_addr *addr) 25651da177e4SLinus Torvalds { 25661da177e4SLinus Torvalds sctp_addip_param_t param; 25671da177e4SLinus Torvalds struct sctp_chunk *retval; 25681da177e4SLinus Torvalds int len = sizeof(param); 25691da177e4SLinus Torvalds union sctp_addr_param addrparam; 25701da177e4SLinus Torvalds int addrlen; 25711da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 25721da177e4SLinus Torvalds 25731da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 25741da177e4SLinus Torvalds if (!addrlen) 25751da177e4SLinus Torvalds return NULL; 25761da177e4SLinus Torvalds len += addrlen; 25771da177e4SLinus Torvalds 25781da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 25791da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 25801da177e4SLinus Torvalds if (!retval) 25811da177e4SLinus Torvalds return NULL; 25821da177e4SLinus Torvalds 25831da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 25841da177e4SLinus Torvalds param.param_hdr.length = htons(len); 25851da177e4SLinus Torvalds param.crr_id = 0; 25861da177e4SLinus Torvalds 25871da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 25881da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 25891da177e4SLinus Torvalds 25901da177e4SLinus Torvalds return retval; 25911da177e4SLinus Torvalds } 25921da177e4SLinus Torvalds 25931da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 25941da177e4SLinus Torvalds * 0 1 2 3 25951da177e4SLinus 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 25961da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25971da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 25981da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25991da177e4SLinus Torvalds * | Serial Number | 26001da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26011da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 26021da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26031da177e4SLinus Torvalds * \ \ 26041da177e4SLinus Torvalds * / .... / 26051da177e4SLinus Torvalds * \ \ 26061da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26071da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 26081da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26091da177e4SLinus Torvalds * 26101da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 26111da177e4SLinus Torvalds */ 26121da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 26131da177e4SLinus Torvalds __u32 serial, int vparam_len) 26141da177e4SLinus Torvalds { 26151da177e4SLinus Torvalds sctp_addiphdr_t asconf; 26161da177e4SLinus Torvalds struct sctp_chunk *retval; 26171da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 26181da177e4SLinus Torvalds 26191da177e4SLinus Torvalds /* Create the chunk. */ 26201da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length); 26211da177e4SLinus Torvalds if (!retval) 26221da177e4SLinus Torvalds return NULL; 26231da177e4SLinus Torvalds 26241da177e4SLinus Torvalds asconf.serial = htonl(serial); 26251da177e4SLinus Torvalds 26261da177e4SLinus Torvalds retval->subh.addip_hdr = 26271da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 26281da177e4SLinus Torvalds 26291da177e4SLinus Torvalds return retval; 26301da177e4SLinus Torvalds } 26311da177e4SLinus Torvalds 26321da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 26339f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2634dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 26351da177e4SLinus Torvalds { 26361da177e4SLinus Torvalds sctp_addip_param_t ack_param; 26371da177e4SLinus Torvalds sctp_errhdr_t err_param; 26381da177e4SLinus Torvalds int asconf_param_len = 0; 26391da177e4SLinus Torvalds int err_param_len = 0; 2640dbc16db1SAl Viro __be16 response_type; 26411da177e4SLinus Torvalds 26421da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 26431da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 26441da177e4SLinus Torvalds } else { 26451da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 26461da177e4SLinus Torvalds err_param_len = sizeof(err_param); 26471da177e4SLinus Torvalds if (asconf_param) 26481da177e4SLinus Torvalds asconf_param_len = 26491da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 26501da177e4SLinus Torvalds } 26511da177e4SLinus Torvalds 26521da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 26531da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 26541da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 26551da177e4SLinus Torvalds err_param_len + 26561da177e4SLinus Torvalds asconf_param_len); 26571da177e4SLinus Torvalds ack_param.crr_id = crr_id; 26581da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 26591da177e4SLinus Torvalds 26601da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 26611da177e4SLinus Torvalds return; 26621da177e4SLinus Torvalds 26631da177e4SLinus Torvalds /* Add Error Cause parameter. */ 26641da177e4SLinus Torvalds err_param.cause = err_code; 26651da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 26661da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 26671da177e4SLinus Torvalds 26681da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 26691da177e4SLinus Torvalds if (asconf_param) 26701da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 26711da177e4SLinus Torvalds } 26721da177e4SLinus Torvalds 26731da177e4SLinus Torvalds /* Process a asconf parameter. */ 2674dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 26751da177e4SLinus Torvalds struct sctp_chunk *asconf, 26761da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 26771da177e4SLinus Torvalds { 26781da177e4SLinus Torvalds struct sctp_transport *peer; 26791da177e4SLinus Torvalds struct sctp_af *af; 26801da177e4SLinus Torvalds union sctp_addr addr; 26811da177e4SLinus Torvalds struct list_head *pos; 26821da177e4SLinus Torvalds union sctp_addr_param *addr_param; 26831da177e4SLinus Torvalds 26841da177e4SLinus Torvalds addr_param = (union sctp_addr_param *) 26851da177e4SLinus Torvalds ((void *)asconf_param + sizeof(sctp_addip_param_t)); 26861da177e4SLinus Torvalds 26871da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); 26881da177e4SLinus Torvalds if (unlikely(!af)) 26891da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 26901da177e4SLinus Torvalds 2691dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 26921da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 26931da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 26941da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 26951da177e4SLinus Torvalds * request and does not have the local resources to add this 26961da177e4SLinus Torvalds * new address to the association, it MUST return an Error 26971da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 26981da177e4SLinus Torvalds * Due to Resource Shortage'. 26991da177e4SLinus Torvalds */ 27001da177e4SLinus Torvalds 2701dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 27021da177e4SLinus Torvalds if (!peer) 27031da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 27041da177e4SLinus Torvalds 27051da177e4SLinus Torvalds /* Start the heartbeat timer. */ 27061da177e4SLinus Torvalds if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) 27071da177e4SLinus Torvalds sctp_transport_hold(peer); 27081da177e4SLinus Torvalds break; 27091da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 27101da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 27111da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 27121da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 27131da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 27141da177e4SLinus Torvalds */ 27151da177e4SLinus Torvalds pos = asoc->peer.transport_addr_list.next; 27161da177e4SLinus Torvalds if (pos->next == &asoc->peer.transport_addr_list) 27171da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 27181da177e4SLinus Torvalds 27191da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 27201da177e4SLinus Torvalds * address which is also the source address of the IP packet 27211da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 27221da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 27231da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 27241da177e4SLinus Torvalds * Delete Source IP Address' 27251da177e4SLinus Torvalds */ 27266a1e5f33SAl Viro if (sctp_cmp_addr_exact(sctp_source(asconf), &addr)) 27271da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 27281da177e4SLinus Torvalds 2729dd86d136SAl Viro sctp_assoc_del_peer(asoc, &addr); 27301da177e4SLinus Torvalds break; 27311da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 2732dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 27331da177e4SLinus Torvalds if (!peer) 27341da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 27351da177e4SLinus Torvalds 27361da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 27371da177e4SLinus Torvalds break; 27381da177e4SLinus Torvalds default: 27391da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 27401da177e4SLinus Torvalds break; 27411da177e4SLinus Torvalds } 27421da177e4SLinus Torvalds 27431da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 27441da177e4SLinus Torvalds } 27451da177e4SLinus Torvalds 27466f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 27476f4c618dSWei Yongjun int sctp_verify_asconf(const struct sctp_association *asoc, 27486f4c618dSWei Yongjun struct sctp_paramhdr *param_hdr, void *chunk_end, 27496f4c618dSWei Yongjun struct sctp_paramhdr **errp) { 27506f4c618dSWei Yongjun sctp_addip_param_t *asconf_param; 27516f4c618dSWei Yongjun union sctp_params param; 27526f4c618dSWei Yongjun int length, plen; 27536f4c618dSWei Yongjun 27546f4c618dSWei Yongjun param.v = (sctp_paramhdr_t *) param_hdr; 27556f4c618dSWei Yongjun while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) { 27566f4c618dSWei Yongjun length = ntohs(param.p->length); 27576f4c618dSWei Yongjun *errp = param.p; 27586f4c618dSWei Yongjun 27596f4c618dSWei Yongjun if (param.v > chunk_end - length || 27606f4c618dSWei Yongjun length < sizeof(sctp_paramhdr_t)) 27616f4c618dSWei Yongjun return 0; 27626f4c618dSWei Yongjun 27636f4c618dSWei Yongjun switch (param.p->type) { 27646f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 27656f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 27666f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 27676f4c618dSWei Yongjun asconf_param = (sctp_addip_param_t *)param.v; 27686f4c618dSWei Yongjun plen = ntohs(asconf_param->param_hdr.length); 27696f4c618dSWei Yongjun if (plen < sizeof(sctp_addip_param_t) + 27706f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 27716f4c618dSWei Yongjun return 0; 27726f4c618dSWei Yongjun break; 27736f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 27746f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 27756f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 27766f4c618dSWei Yongjun return 0; 27776f4c618dSWei Yongjun 27786f4c618dSWei Yongjun break; 27796f4c618dSWei Yongjun default: 27806f4c618dSWei Yongjun break; 27816f4c618dSWei Yongjun } 27826f4c618dSWei Yongjun 27836f4c618dSWei Yongjun param.v += WORD_ROUND(length); 27846f4c618dSWei Yongjun } 27856f4c618dSWei Yongjun 27866f4c618dSWei Yongjun if (param.v != chunk_end) 27876f4c618dSWei Yongjun return 0; 27886f4c618dSWei Yongjun 27896f4c618dSWei Yongjun return 1; 27906f4c618dSWei Yongjun } 27916f4c618dSWei Yongjun 27921da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 27931da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 27941da177e4SLinus Torvalds */ 27951da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 27961da177e4SLinus Torvalds struct sctp_chunk *asconf) 27971da177e4SLinus Torvalds { 27981da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 27991da177e4SLinus Torvalds union sctp_addr_param *addr_param; 28001da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 28011da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 28021da177e4SLinus Torvalds 2803dbc16db1SAl Viro __be16 err_code; 28041da177e4SLinus Torvalds int length = 0; 28051da177e4SLinus Torvalds int chunk_len = asconf->skb->len; 28061da177e4SLinus Torvalds __u32 serial; 28071da177e4SLinus Torvalds int all_param_pass = 1; 28081da177e4SLinus Torvalds 28091da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 28101da177e4SLinus Torvalds serial = ntohl(hdr->serial); 28111da177e4SLinus Torvalds 28121da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 28131da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 28141da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 28151da177e4SLinus Torvalds chunk_len -= length; 28161da177e4SLinus Torvalds 28171da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 28181da177e4SLinus Torvalds * asconf paramter. 28191da177e4SLinus Torvalds */ 28201da177e4SLinus Torvalds length = ntohs(addr_param->v4.param_hdr.length); 28211da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); 28221da177e4SLinus Torvalds chunk_len -= length; 28231da177e4SLinus Torvalds 28241da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 28251da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 28261da177e4SLinus Torvalds * ASCONF_ACK parameters are less than or equal to the twice of ASCONF 28271da177e4SLinus Torvalds * paramters. 28281da177e4SLinus Torvalds */ 28291da177e4SLinus Torvalds asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2); 28301da177e4SLinus Torvalds if (!asconf_ack) 28311da177e4SLinus Torvalds goto done; 28321da177e4SLinus Torvalds 28331da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 28341da177e4SLinus Torvalds while (chunk_len > 0) { 28351da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 28361da177e4SLinus Torvalds asconf_param); 28371da177e4SLinus Torvalds /* ADDIP 4.1 A7) 28381da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 28391da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 28401da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 28411da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 28421da177e4SLinus Torvalds * a specific success indication is present for the parameter. 28431da177e4SLinus Torvalds */ 28441da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR != err_code) 28451da177e4SLinus Torvalds all_param_pass = 0; 28461da177e4SLinus Torvalds 28471da177e4SLinus Torvalds if (!all_param_pass) 28481da177e4SLinus Torvalds sctp_add_asconf_response(asconf_ack, 28491da177e4SLinus Torvalds asconf_param->crr_id, err_code, 28501da177e4SLinus Torvalds asconf_param); 28511da177e4SLinus Torvalds 28521da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 28531da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 28541da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 28551da177e4SLinus Torvalds * in the ASCONF. 28561da177e4SLinus Torvalds */ 28571da177e4SLinus Torvalds if (SCTP_ERROR_RSRC_LOW == err_code) 28581da177e4SLinus Torvalds goto done; 28591da177e4SLinus Torvalds 28601da177e4SLinus Torvalds /* Move to the next ASCONF param. */ 28611da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 28621da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)asconf_param + 28631da177e4SLinus Torvalds length); 28641da177e4SLinus Torvalds chunk_len -= length; 28651da177e4SLinus Torvalds } 28661da177e4SLinus Torvalds 28671da177e4SLinus Torvalds done: 28681da177e4SLinus Torvalds asoc->peer.addip_serial++; 28691da177e4SLinus Torvalds 28701da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 28711da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 28721da177e4SLinus Torvalds */ 28731da177e4SLinus Torvalds if (asconf_ack) { 28741da177e4SLinus Torvalds if (asoc->addip_last_asconf_ack) 28751da177e4SLinus Torvalds sctp_chunk_free(asoc->addip_last_asconf_ack); 28761da177e4SLinus Torvalds 28771da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 28781da177e4SLinus Torvalds asoc->addip_last_asconf_ack = asconf_ack; 28791da177e4SLinus Torvalds } 28801da177e4SLinus Torvalds 28811da177e4SLinus Torvalds return asconf_ack; 28821da177e4SLinus Torvalds } 28831da177e4SLinus Torvalds 28841da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 28851da177e4SLinus Torvalds static int sctp_asconf_param_success(struct sctp_association *asoc, 28861da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 28871da177e4SLinus Torvalds { 28881da177e4SLinus Torvalds struct sctp_af *af; 28891da177e4SLinus Torvalds union sctp_addr addr; 28901da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 28911da177e4SLinus Torvalds union sctp_addr_param *addr_param; 28921da177e4SLinus Torvalds struct list_head *pos; 28931da177e4SLinus Torvalds struct sctp_transport *transport; 2894dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 28951da177e4SLinus Torvalds int retval = 0; 28961da177e4SLinus Torvalds 28971da177e4SLinus Torvalds addr_param = (union sctp_addr_param *) 28981da177e4SLinus Torvalds ((void *)asconf_param + sizeof(sctp_addip_param_t)); 28991da177e4SLinus Torvalds 29001da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 29011da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); 2902dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 29031da177e4SLinus Torvalds 29041da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 29051da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 2906559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 2907559cf710SVlad Yasevich * held, so the list can not change. 2908559cf710SVlad Yasevich */ 2909559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 2910dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 2911dc022a98SSridhar Samudrala saddr->use_as_src = 1; 2912dc022a98SSridhar Samudrala } 29131da177e4SLinus Torvalds break; 29141da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 2915559cf710SVlad Yasevich retval = sctp_del_bind_addr(bp, &addr, call_rcu_bh); 29161da177e4SLinus Torvalds list_for_each(pos, &asoc->peer.transport_addr_list) { 29171da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, 29181da177e4SLinus Torvalds transports); 2919dc022a98SSridhar Samudrala dst_release(transport->dst); 29201da177e4SLinus Torvalds sctp_transport_route(transport, NULL, 29211da177e4SLinus Torvalds sctp_sk(asoc->base.sk)); 29221da177e4SLinus Torvalds } 29231da177e4SLinus Torvalds break; 29241da177e4SLinus Torvalds default: 29251da177e4SLinus Torvalds break; 29261da177e4SLinus Torvalds } 29271da177e4SLinus Torvalds 29281da177e4SLinus Torvalds return retval; 29291da177e4SLinus Torvalds } 29301da177e4SLinus Torvalds 29311da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 29321da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 29331da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 29341da177e4SLinus Torvalds * ADDIP 4.1 29351da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 29361da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 29371da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 29381da177e4SLinus Torvalds * specific success indication is present for the parameter. 29391da177e4SLinus Torvalds */ 2940dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 29411da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 29421da177e4SLinus Torvalds int no_err) 29431da177e4SLinus Torvalds { 29441da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 29451da177e4SLinus Torvalds sctp_errhdr_t *err_param; 29461da177e4SLinus Torvalds int length; 29471da177e4SLinus Torvalds int asconf_ack_len = asconf_ack->skb->len; 2948dbc16db1SAl Viro __be16 err_code; 29491da177e4SLinus Torvalds 29501da177e4SLinus Torvalds if (no_err) 29511da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 29521da177e4SLinus Torvalds else 29531da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 29541da177e4SLinus Torvalds 29551da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 29561da177e4SLinus Torvalds * the first asconf_ack parameter. 29571da177e4SLinus Torvalds */ 29581da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 29591da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 29601da177e4SLinus Torvalds length); 29611da177e4SLinus Torvalds asconf_ack_len -= length; 29621da177e4SLinus Torvalds 29631da177e4SLinus Torvalds while (asconf_ack_len > 0) { 29641da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 29651da177e4SLinus Torvalds switch(asconf_ack_param->param_hdr.type) { 29661da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 29671da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 29681da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 29691da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 29701da177e4SLinus Torvalds err_param = (sctp_errhdr_t *) 29711da177e4SLinus Torvalds ((void *)asconf_ack_param + length); 29721da177e4SLinus Torvalds asconf_ack_len -= length; 29731da177e4SLinus Torvalds if (asconf_ack_len > 0) 29741da177e4SLinus Torvalds return err_param->cause; 29751da177e4SLinus Torvalds else 29761da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 29771da177e4SLinus Torvalds break; 29781da177e4SLinus Torvalds default: 29791da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 29801da177e4SLinus Torvalds } 29811da177e4SLinus Torvalds } 29821da177e4SLinus Torvalds 29831da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 29841da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *) 29851da177e4SLinus Torvalds ((void *)asconf_ack_param + length); 29861da177e4SLinus Torvalds asconf_ack_len -= length; 29871da177e4SLinus Torvalds } 29881da177e4SLinus Torvalds 29891da177e4SLinus Torvalds return err_code; 29901da177e4SLinus Torvalds } 29911da177e4SLinus Torvalds 29921da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 29931da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 29941da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 29951da177e4SLinus Torvalds { 29961da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 29971da177e4SLinus Torvalds union sctp_addr_param *addr_param; 29981da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 29991da177e4SLinus Torvalds int length = 0; 30001da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 30011da177e4SLinus Torvalds int all_param_pass = 0; 30021da177e4SLinus Torvalds int no_err = 1; 30031da177e4SLinus Torvalds int retval = 0; 3004dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 30051da177e4SLinus Torvalds 30061da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 30071da177e4SLinus Torvalds * a pointer to address parameter. 30081da177e4SLinus Torvalds */ 30091da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 30101da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 30111da177e4SLinus Torvalds asconf_len -= length; 30121da177e4SLinus Torvalds 30131da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 30141da177e4SLinus Torvalds * pointer to the first asconf paramter. 30151da177e4SLinus Torvalds */ 30161da177e4SLinus Torvalds length = ntohs(addr_param->v4.param_hdr.length); 30171da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); 30181da177e4SLinus Torvalds asconf_len -= length; 30191da177e4SLinus Torvalds 30201da177e4SLinus Torvalds /* ADDIP 4.1 30211da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 30221da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 30231da177e4SLinus Torvalds * successful. 30241da177e4SLinus Torvalds */ 30251da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 30261da177e4SLinus Torvalds all_param_pass = 1; 30271da177e4SLinus Torvalds 30281da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 30291da177e4SLinus Torvalds while (asconf_len > 0) { 30301da177e4SLinus Torvalds if (all_param_pass) 30311da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 30321da177e4SLinus Torvalds else { 30331da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 30341da177e4SLinus Torvalds asconf_param, 30351da177e4SLinus Torvalds no_err); 30361da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 30371da177e4SLinus Torvalds no_err = 0; 30381da177e4SLinus Torvalds } 30391da177e4SLinus Torvalds 30401da177e4SLinus Torvalds switch (err_code) { 30411da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 30421da177e4SLinus Torvalds retval = sctp_asconf_param_success(asoc, asconf_param); 30431da177e4SLinus Torvalds break; 30441da177e4SLinus Torvalds 30451da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 30461da177e4SLinus Torvalds retval = 1; 30471da177e4SLinus Torvalds break; 30481da177e4SLinus Torvalds 30491da177e4SLinus Torvalds case SCTP_ERROR_INV_PARAM: 30501da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 30511da177e4SLinus Torvalds * future. 30521da177e4SLinus Torvalds */ 30531da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 30541da177e4SLinus Torvalds asconf_param->param_hdr.type; 30551da177e4SLinus Torvalds break; 30561da177e4SLinus Torvalds 30571da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 30581da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 30591da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 30601da177e4SLinus Torvalds default: 30611da177e4SLinus Torvalds break; 30621da177e4SLinus Torvalds } 30631da177e4SLinus Torvalds 30641da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 30651da177e4SLinus Torvalds * one. 30661da177e4SLinus Torvalds */ 30671da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 30681da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)asconf_param + 30691da177e4SLinus Torvalds length); 30701da177e4SLinus Torvalds asconf_len -= length; 30711da177e4SLinus Torvalds } 30721da177e4SLinus Torvalds 30731da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 30741da177e4SLinus Torvalds sctp_chunk_free(asconf); 30751da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 30761da177e4SLinus Torvalds 30771da177e4SLinus Torvalds /* Send the next asconf chunk from the addip chunk queue. */ 307879af02c2SDavid S. Miller if (!list_empty(&asoc->addip_chunk_list)) { 307979af02c2SDavid S. Miller struct list_head *entry = asoc->addip_chunk_list.next; 308079af02c2SDavid S. Miller asconf = list_entry(entry, struct sctp_chunk, list); 308179af02c2SDavid S. Miller 308279af02c2SDavid S. Miller list_del_init(entry); 308379af02c2SDavid S. Miller 30841da177e4SLinus Torvalds /* Hold the chunk until an ASCONF_ACK is received. */ 30851da177e4SLinus Torvalds sctp_chunk_hold(asconf); 30861da177e4SLinus Torvalds if (sctp_primitive_ASCONF(asoc, asconf)) 30871da177e4SLinus Torvalds sctp_chunk_free(asconf); 30881da177e4SLinus Torvalds else 30891da177e4SLinus Torvalds asoc->addip_last_asconf = asconf; 30901da177e4SLinus Torvalds } 30911da177e4SLinus Torvalds 30921da177e4SLinus Torvalds return retval; 30931da177e4SLinus Torvalds } 30941da177e4SLinus Torvalds 30951da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 30961da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 30971da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 30981da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 30991da177e4SLinus Torvalds { 31001da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 31011da177e4SLinus Torvalds struct sctp_fwdtsn_chunk *ftsn_chunk; 31021da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 31031da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 31041da177e4SLinus Torvalds size_t hint; 31051da177e4SLinus Torvalds int i; 31061da177e4SLinus Torvalds 31071da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 31081da177e4SLinus Torvalds 31091da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint); 31101da177e4SLinus Torvalds 31111da177e4SLinus Torvalds if (!retval) 31121da177e4SLinus Torvalds return NULL; 31131da177e4SLinus Torvalds 31141da177e4SLinus Torvalds ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr; 31151da177e4SLinus Torvalds 31161da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 31171da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 31181da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 31191da177e4SLinus Torvalds 31201da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 31211da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 31221da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 31231da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 31241da177e4SLinus Torvalds } 31251da177e4SLinus Torvalds 31261da177e4SLinus Torvalds return retval; 31271da177e4SLinus Torvalds } 3128