160c778b2SVlad Yasevich /* SCTP kernel 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 * 760c778b2SVlad Yasevich * This file is part of the SCTP kernel 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 * 1360c778b2SVlad Yasevich * This SCTP 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 * 1960c778b2SVlad Yasevich * This SCTP 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 264b2f13a2SJeff Kirsher * along with GNU CC; see the file COPYING. If not, see 274b2f13a2SJeff Kirsher * <http://www.gnu.org/licenses/>. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 301da177e4SLinus Torvalds * email address(es): 3191705c61SDaniel Borkmann * lksctp developers <linux-sctp@vger.kernel.org> 321da177e4SLinus Torvalds * 331da177e4SLinus Torvalds * Written or modified by: 341da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 351da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 361da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 371da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 381da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 391da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 401da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 411da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 421da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 431da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 441da177e4SLinus Torvalds */ 451da177e4SLinus Torvalds 46145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 47145ce502SJoe Perches 481da177e4SLinus Torvalds #include <linux/types.h> 491da177e4SLinus Torvalds #include <linux/kernel.h> 501da177e4SLinus Torvalds #include <linux/ip.h> 511da177e4SLinus Torvalds #include <linux/ipv6.h> 521da177e4SLinus Torvalds #include <linux/net.h> 531da177e4SLinus Torvalds #include <linux/inet.h> 54ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 551da177e4SLinus Torvalds #include <linux/crypto.h> 565a0e3ad6STejun Heo #include <linux/slab.h> 571da177e4SLinus Torvalds #include <net/sock.h> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <linux/skbuff.h> 601da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 611da177e4SLinus Torvalds #include <net/sctp/sctp.h> 621da177e4SLinus Torvalds #include <net/sctp/sm.h> 631da177e4SLinus Torvalds 64072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 65072017b4SVlad Yasevich __u8 type, __u8 flags, int paylen); 66072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 67072017b4SVlad Yasevich __u8 flags, int paylen); 68072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 691da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen); 701da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 711da177e4SLinus Torvalds const struct sctp_association *asoc, 721da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 731da177e4SLinus Torvalds int *cookie_len, 741da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 751da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 761da177e4SLinus Torvalds union sctp_params param, 771da177e4SLinus Torvalds const union sctp_addr *peer_addr, 78dd0fc66fSAl Viro gfp_t gfp); 798ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 808ee4be37SVlad Yasevich const void *data); 816daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, 826daaf0deSstephen hemminger const void *data); 831da177e4SLinus Torvalds 84072017b4SVlad Yasevich /* Control chunk destructor */ 85072017b4SVlad Yasevich static void sctp_control_release_owner(struct sk_buff *skb) 86072017b4SVlad Yasevich { 87072017b4SVlad Yasevich /*TODO: do memory release */ 88072017b4SVlad Yasevich } 89072017b4SVlad Yasevich 90072017b4SVlad Yasevich static void sctp_control_set_owner_w(struct sctp_chunk *chunk) 91072017b4SVlad Yasevich { 92072017b4SVlad Yasevich struct sctp_association *asoc = chunk->asoc; 93072017b4SVlad Yasevich struct sk_buff *skb = chunk->skb; 94072017b4SVlad Yasevich 95072017b4SVlad Yasevich /* TODO: properly account for control chunks. 96072017b4SVlad Yasevich * To do it right we'll need: 97072017b4SVlad Yasevich * 1) endpoint if association isn't known. 98072017b4SVlad Yasevich * 2) proper memory accounting. 99072017b4SVlad Yasevich * 100072017b4SVlad Yasevich * For now don't do anything for now. 101072017b4SVlad Yasevich */ 102072017b4SVlad Yasevich skb->sk = asoc ? asoc->base.sk : NULL; 103072017b4SVlad Yasevich skb->destructor = sctp_control_release_owner; 104072017b4SVlad Yasevich } 105072017b4SVlad Yasevich 1061da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 1071da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 1081da177e4SLinus Torvalds { 1091da177e4SLinus Torvalds struct sctp_af *af; 1101da177e4SLinus Torvalds int iif = 0; 1111da177e4SLinus Torvalds 112eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version)); 1131da177e4SLinus Torvalds if (af) 1141da177e4SLinus Torvalds iif = af->skb_iif(chunk->skb); 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds return iif; 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1201da177e4SLinus Torvalds * 1211da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1221da177e4SLinus Torvalds * Explicit Congestion Notification. 1231da177e4SLinus Torvalds */ 1241da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1251da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 12609640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1271da177e4SLinus Torvalds }; 1281da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1291da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 13009640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1311da177e4SLinus Torvalds }; 1321da177e4SLinus Torvalds 1335fa782c2SNeil Horman /* A helper to initialize an op error inside a 1341da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1351da177e4SLinus Torvalds * abort chunk. 1361da177e4SLinus Torvalds */ 1375bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 13800f1c2dfSWei Yongjun size_t paylen) 1391da177e4SLinus Torvalds { 1401da177e4SLinus Torvalds sctp_errhdr_t err; 1411da177e4SLinus Torvalds __u16 len; 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1441da177e4SLinus Torvalds err.cause = cause_code; 1451da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1461da177e4SLinus Torvalds err.length = htons(len); 1474a1c0107SVlad Yasevich chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 1505fa782c2SNeil Horman /* A helper to initialize an op error inside a 1515fa782c2SNeil Horman * provided chunk, as most cause codes will be embedded inside an 1525fa782c2SNeil Horman * abort chunk. Differs from sctp_init_cause in that it won't oops 1535fa782c2SNeil Horman * if there isn't enough space in the op error chunk 1545fa782c2SNeil Horman */ 155db28aafaSIoan Orghici static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, 1565fa782c2SNeil Horman size_t paylen) 1575fa782c2SNeil Horman { 1585fa782c2SNeil Horman sctp_errhdr_t err; 1595fa782c2SNeil Horman __u16 len; 1605fa782c2SNeil Horman 1615fa782c2SNeil Horman /* Cause code constants are now defined in network order. */ 1625fa782c2SNeil Horman err.cause = cause_code; 1635fa782c2SNeil Horman len = sizeof(sctp_errhdr_t) + paylen; 1645fa782c2SNeil Horman err.length = htons(len); 1655fa782c2SNeil Horman 1662e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) < len) 1675fa782c2SNeil Horman return -ENOSPC; 1685fa782c2SNeil Horman chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, 1695fa782c2SNeil Horman sizeof(sctp_errhdr_t), 1705fa782c2SNeil Horman &err); 1715fa782c2SNeil Horman return 0; 1725fa782c2SNeil Horman } 1731da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1741da177e4SLinus Torvalds * 1751da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1761da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1771da177e4SLinus Torvalds * 1781da177e4SLinus Torvalds * 0 1 2 3 1791da177e4SLinus 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 1801da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1811da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1821da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1831da177e4SLinus Torvalds * | Initiate Tag | 1841da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1851da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1871da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1881da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1891da177e4SLinus Torvalds * | Initial TSN | 1901da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1911da177e4SLinus Torvalds * \ \ 1921da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1931da177e4SLinus Torvalds * \ \ 1941da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1951da177e4SLinus Torvalds * 1961da177e4SLinus Torvalds * 1971da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1981da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1991da177e4SLinus Torvalds * 2001da177e4SLinus Torvalds * Fixed Parameters Status 2011da177e4SLinus Torvalds * ---------------------------------------------- 2021da177e4SLinus Torvalds * Initiate Tag Mandatory 2031da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 2041da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 2051da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 2061da177e4SLinus Torvalds * Initial TSN Mandatory 2071da177e4SLinus Torvalds * 2081da177e4SLinus Torvalds * Variable Parameters Status Type Value 2091da177e4SLinus Torvalds * ------------------------------------------------------------- 2101da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 2111da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 2121da177e4SLinus Torvalds * Cookie Preservative Optional 9 2131da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 2141da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 2151da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 2161da177e4SLinus Torvalds */ 2171da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 2181da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 219dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2201da177e4SLinus Torvalds { 221e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2221da177e4SLinus Torvalds sctp_inithdr_t init; 2231da177e4SLinus Torvalds union sctp_params addrs; 2241da177e4SLinus Torvalds size_t chunksize; 2251da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2261da177e4SLinus Torvalds int num_types, addrs_len = 0; 2271da177e4SLinus Torvalds struct sctp_sock *sp; 2281da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 2293dbe8656SAl Viro __be16 types[2]; 2300f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 231131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 232131a47e3SVlad Yasevich int num_ext = 0; 233131a47e3SVlad Yasevich __u8 extensions[3]; 234730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 235730fc3d0SVlad Yasevich *auth_hmacs = NULL; 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2381da177e4SLinus Torvalds * 2391da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2401da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2411da177e4SLinus Torvalds */ 2421da177e4SLinus Torvalds retval = NULL; 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2451da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2481da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2491da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2501da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2511da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds /* How many address types are needed? */ 2541da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2551da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2561da177e4SLinus Torvalds 257a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 258a8170c35SWei Yongjun chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types)); 2591da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2608ee4be37SVlad Yasevich 261e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 262036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 263036b579bSVlad Yasevich 264131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 265131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 266131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 267131a47e3SVlad Yasevich * INIT-ACK parameters. 268131a47e3SVlad Yasevich */ 269e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) { 270131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 271131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 272131a47e3SVlad Yasevich num_ext += 2; 273131a47e3SVlad Yasevich } 274131a47e3SVlad Yasevich 2756fc791eeSmalc if (sp->adaptation_ind) 2761da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2776fc791eeSmalc 2781da177e4SLinus Torvalds chunksize += vparam_len; 2791da177e4SLinus Torvalds 280730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 281e1fc3b14SEric W. Biederman if (net->sctp.auth_enable) { 282730fc3d0SVlad Yasevich /* Add random parameter length*/ 283730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 284730fc3d0SVlad Yasevich 285730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 286730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 287730fc3d0SVlad Yasevich if (auth_hmacs->length) 288a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 289730fc3d0SVlad Yasevich else 290730fc3d0SVlad Yasevich auth_hmacs = NULL; 291730fc3d0SVlad Yasevich 292730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 293730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 294730fc3d0SVlad Yasevich if (auth_chunks->length) 295a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 296730fc3d0SVlad Yasevich else 2979baffaa6SVlad Yasevich auth_chunks = NULL; 298730fc3d0SVlad Yasevich 299730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 300730fc3d0SVlad Yasevich num_ext += 1; 301730fc3d0SVlad Yasevich } 302730fc3d0SVlad Yasevich 303131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 304131a47e3SVlad Yasevich if (num_ext) 305a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 306a8170c35SWei Yongjun num_ext); 307131a47e3SVlad Yasevich 3081da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3091da177e4SLinus Torvalds * 3101da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 3111da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 3121da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 3131da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 3141da177e4SLinus Torvalds * other address types if the Host Name address parameter is 3151da177e4SLinus Torvalds * present in the received INIT chunk. 3161da177e4SLinus Torvalds * 3171da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 3181da177e4SLinus Torvalds */ 3191da177e4SLinus Torvalds 320072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize); 3211da177e4SLinus Torvalds if (!retval) 3221da177e4SLinus Torvalds goto nodata; 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds retval->subh.init_hdr = 3251da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3261da177e4SLinus Torvalds retval->param_hdr.v = 3271da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3301da177e4SLinus Torvalds * 3311da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3321da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3331da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3341da177e4SLinus Torvalds * support any address type. 3351da177e4SLinus Torvalds */ 3361da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3371da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3381da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3391da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 342131a47e3SVlad Yasevich 3437aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 344131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 345131a47e3SVlad Yasevich */ 346131a47e3SVlad Yasevich if (num_ext) { 347131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 348131a47e3SVlad Yasevich ext_param.param_hdr.length = 349131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 350131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 351131a47e3SVlad Yasevich &ext_param); 3528ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 353131a47e3SVlad Yasevich } 354131a47e3SVlad Yasevich 355e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 3561da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 357131a47e3SVlad Yasevich 3586fc791eeSmalc if (sp->adaptation_ind) { 3590f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3601da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3610f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3621da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3636fc791eeSmalc } 364131a47e3SVlad Yasevich 365730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 366e1fc3b14SEric W. Biederman if (net->sctp.auth_enable) { 367730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 368730fc3d0SVlad Yasevich asoc->c.auth_random); 369730fc3d0SVlad Yasevich if (auth_hmacs) 370730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 371730fc3d0SVlad Yasevich auth_hmacs); 372730fc3d0SVlad Yasevich if (auth_chunks) 373730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 374730fc3d0SVlad Yasevich auth_chunks); 375730fc3d0SVlad Yasevich } 3761da177e4SLinus Torvalds nodata: 3771da177e4SLinus Torvalds kfree(addrs.v); 3781da177e4SLinus Torvalds return retval; 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3821da177e4SLinus Torvalds const struct sctp_chunk *chunk, 383dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3841da177e4SLinus Torvalds { 3851da177e4SLinus Torvalds sctp_inithdr_t initack; 3861da177e4SLinus Torvalds struct sctp_chunk *retval; 3871da177e4SLinus Torvalds union sctp_params addrs; 3886fc791eeSmalc struct sctp_sock *sp; 3891da177e4SLinus Torvalds int addrs_len; 3901da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3911da177e4SLinus Torvalds int cookie_len; 3921da177e4SLinus Torvalds size_t chunksize; 3930f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 394131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 395131a47e3SVlad Yasevich int num_ext = 0; 396131a47e3SVlad Yasevich __u8 extensions[3]; 397730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 398730fc3d0SVlad Yasevich *auth_hmacs = NULL, 399730fc3d0SVlad Yasevich *auth_random = NULL; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds retval = NULL; 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 4041da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 4071da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 4081da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 4091da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 4101da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 4131da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 4141da177e4SLinus Torvalds */ 4151da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 4161da177e4SLinus Torvalds addrs.v, addrs_len); 4171da177e4SLinus Torvalds if (!cookie) 4181da177e4SLinus Torvalds goto nomem_cookie; 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4211da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4221da177e4SLinus Torvalds */ 4236fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4241da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4271da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4281da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4291da177e4SLinus Torvalds 4305ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 431036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 432036b579bSVlad Yasevich 4335ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 434131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 435131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 436131a47e3SVlad Yasevich num_ext += 2; 437131a47e3SVlad Yasevich } 438131a47e3SVlad Yasevich 4396fc791eeSmalc if (sp->adaptation_ind) 4401da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4411da177e4SLinus Torvalds 442730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 443730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 444730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 445730fc3d0SVlad Yasevich 446730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 447730fc3d0SVlad Yasevich if (auth_hmacs->length) 448a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 449730fc3d0SVlad Yasevich else 450730fc3d0SVlad Yasevich auth_hmacs = NULL; 451730fc3d0SVlad Yasevich 452730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 453730fc3d0SVlad Yasevich if (auth_chunks->length) 454a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 455730fc3d0SVlad Yasevich else 456730fc3d0SVlad Yasevich auth_chunks = NULL; 457730fc3d0SVlad Yasevich 458730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 459730fc3d0SVlad Yasevich num_ext += 1; 460730fc3d0SVlad Yasevich } 461730fc3d0SVlad Yasevich 4628ee4be37SVlad Yasevich if (num_ext) 463a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 464a8170c35SWei Yongjun num_ext); 4658ee4be37SVlad Yasevich 4661da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 467072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize); 4681da177e4SLinus Torvalds if (!retval) 4691da177e4SLinus Torvalds goto nomem_chunk; 4701da177e4SLinus Torvalds 471b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 472b99a4d53SDan Carpenter * 473b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 474b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 475b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 476b99a4d53SDan Carpenter * to which it is replying. 477b99a4d53SDan Carpenter * 478b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4791da177e4SLinus Torvalds */ 4801da177e4SLinus Torvalds retval->transport = chunk->transport; 481b99a4d53SDan Carpenter 4821da177e4SLinus Torvalds retval->subh.init_hdr = 4831da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4841da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4851da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4861da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4871da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 488131a47e3SVlad Yasevich if (num_ext) { 489131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 490131a47e3SVlad Yasevich ext_param.param_hdr.length = 491131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 492131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 493131a47e3SVlad Yasevich &ext_param); 4948ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 495131a47e3SVlad Yasevich } 4961da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 4971da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 4981da177e4SLinus Torvalds 4996fc791eeSmalc if (sp->adaptation_ind) { 5000f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 5011da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 5026fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 5031da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 5046fc791eeSmalc } 5051da177e4SLinus Torvalds 506730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 507730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 508730fc3d0SVlad Yasevich auth_random); 509730fc3d0SVlad Yasevich if (auth_hmacs) 510730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 511730fc3d0SVlad Yasevich auth_hmacs); 512730fc3d0SVlad Yasevich if (auth_chunks) 513730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 514730fc3d0SVlad Yasevich auth_chunks); 515730fc3d0SVlad Yasevich } 516730fc3d0SVlad Yasevich 5171da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 5181da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds nomem_chunk: 5211da177e4SLinus Torvalds kfree(cookie); 5221da177e4SLinus Torvalds nomem_cookie: 5231da177e4SLinus Torvalds kfree(addrs.v); 5241da177e4SLinus Torvalds return retval; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5281da177e4SLinus Torvalds * 5291da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5301da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5311da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5321da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5331da177e4SLinus Torvalds * chunks in the same packet. 5341da177e4SLinus Torvalds * 5351da177e4SLinus Torvalds * 0 1 2 3 5361da177e4SLinus 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 5371da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5381da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5391da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5401da177e4SLinus Torvalds * / Cookie / 5411da177e4SLinus Torvalds * \ \ 5421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5431da177e4SLinus Torvalds * 5441da177e4SLinus Torvalds * Chunk Flags: 8 bit 5451da177e4SLinus Torvalds * 5461da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5471da177e4SLinus Torvalds * 5481da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5491da177e4SLinus Torvalds * 5501da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5511da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5521da177e4SLinus Torvalds * 5531da177e4SLinus Torvalds * Cookie: variable size 5541da177e4SLinus Torvalds * 5551da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5561da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5571da177e4SLinus Torvalds * 5581da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5591da177e4SLinus Torvalds * to insure interoperability. 5601da177e4SLinus Torvalds */ 5611da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5621da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5631da177e4SLinus Torvalds { 5641da177e4SLinus Torvalds struct sctp_chunk *retval; 5651da177e4SLinus Torvalds void *cookie; 5661da177e4SLinus Torvalds int cookie_len; 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5691da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 572072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); 5731da177e4SLinus Torvalds if (!retval) 5741da177e4SLinus Torvalds goto nodata; 5751da177e4SLinus Torvalds retval->subh.cookie_hdr = 5761da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5791da177e4SLinus Torvalds * 5801da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5811da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5821da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5831da177e4SLinus Torvalds * to which it is replying. 5841da177e4SLinus Torvalds * 5851da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5861da177e4SLinus Torvalds */ 5871da177e4SLinus Torvalds if (chunk) 5881da177e4SLinus Torvalds retval->transport = chunk->transport; 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds nodata: 5911da177e4SLinus Torvalds return retval; 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5951da177e4SLinus Torvalds * 5961da177e4SLinus Torvalds * This chunk is used only during the initialization of an 5971da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 5981da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 5991da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 6001da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 6011da177e4SLinus Torvalds * 6021da177e4SLinus Torvalds * 0 1 2 3 6031da177e4SLinus 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 6041da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6051da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 6061da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6071da177e4SLinus Torvalds * 6081da177e4SLinus Torvalds * Chunk Flags: 8 bits 6091da177e4SLinus Torvalds * 6101da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 6111da177e4SLinus Torvalds */ 6121da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 6131da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6141da177e4SLinus Torvalds { 6151da177e4SLinus Torvalds struct sctp_chunk *retval; 6161da177e4SLinus Torvalds 617072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0); 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6201da177e4SLinus Torvalds * 6211da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6221da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6231da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6241da177e4SLinus Torvalds * to which it is replying. 6251da177e4SLinus Torvalds * 6261da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6271da177e4SLinus Torvalds */ 6281da177e4SLinus Torvalds if (retval && chunk) 6291da177e4SLinus Torvalds retval->transport = chunk->transport; 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds return retval; 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds /* 6351da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6361da177e4SLinus Torvalds * CWR: 6371da177e4SLinus Torvalds * 6381da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6391da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6401da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6411da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6421da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6431da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6441da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6451da177e4SLinus Torvalds * CE bit. 6461da177e4SLinus Torvalds * 6471da177e4SLinus Torvalds * 0 1 2 3 6481da177e4SLinus 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 6491da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6501da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6511da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6521da177e4SLinus Torvalds * | Lowest TSN Number | 6531da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6541da177e4SLinus Torvalds * 6551da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6561da177e4SLinus Torvalds */ 6571da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6581da177e4SLinus Torvalds const __u32 lowest_tsn, 6591da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6601da177e4SLinus Torvalds { 6611da177e4SLinus Torvalds struct sctp_chunk *retval; 6621da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 665072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, 6661da177e4SLinus Torvalds sizeof(sctp_cwrhdr_t)); 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds if (!retval) 6691da177e4SLinus Torvalds goto nodata; 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6721da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6751da177e4SLinus Torvalds * 6761da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6771da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6781da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6791da177e4SLinus Torvalds * to which it is replying. 6801da177e4SLinus Torvalds * 6811da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6821da177e4SLinus Torvalds * came from.] 6831da177e4SLinus Torvalds */ 6841da177e4SLinus Torvalds if (chunk) 6851da177e4SLinus Torvalds retval->transport = chunk->transport; 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds nodata: 6881da177e4SLinus Torvalds return retval; 6891da177e4SLinus Torvalds } 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6921da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6931da177e4SLinus Torvalds const __u32 lowest_tsn) 6941da177e4SLinus Torvalds { 6951da177e4SLinus Torvalds struct sctp_chunk *retval; 6961da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 699072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, 7001da177e4SLinus Torvalds sizeof(sctp_ecnehdr_t)); 7011da177e4SLinus Torvalds if (!retval) 7021da177e4SLinus Torvalds goto nodata; 7031da177e4SLinus Torvalds retval->subh.ecne_hdr = 7041da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds nodata: 7071da177e4SLinus Torvalds return retval; 7081da177e4SLinus Torvalds } 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 7111da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 7121da177e4SLinus Torvalds */ 7131da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 7141da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 7151da177e4SLinus Torvalds int data_len, __u8 flags, __u16 ssn) 7161da177e4SLinus Torvalds { 7171da177e4SLinus Torvalds struct sctp_chunk *retval; 7181da177e4SLinus Torvalds struct sctp_datahdr dp; 7191da177e4SLinus Torvalds int chunk_len; 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7221da177e4SLinus Torvalds * creating the chunk. 7231da177e4SLinus Torvalds */ 7241da177e4SLinus Torvalds dp.tsn = 0; 7251da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 7261da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 729eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 7301da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7311da177e4SLinus Torvalds dp.ssn = 0; 7321da177e4SLinus Torvalds } else 7331da177e4SLinus Torvalds dp.ssn = htons(ssn); 7341da177e4SLinus Torvalds 7351da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 736072017b4SVlad Yasevich retval = sctp_make_data(asoc, flags, chunk_len); 7371da177e4SLinus Torvalds if (!retval) 7381da177e4SLinus Torvalds goto nodata; 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7411da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvalds nodata: 7441da177e4SLinus Torvalds return retval; 7451da177e4SLinus Torvalds } 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7481da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7491da177e4SLinus Torvalds * including duplicates and gaps. 7501da177e4SLinus Torvalds */ 7511da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7521da177e4SLinus Torvalds { 7531da177e4SLinus Torvalds struct sctp_chunk *retval; 7541da177e4SLinus Torvalds struct sctp_sackhdr sack; 7551da177e4SLinus Torvalds int len; 7561da177e4SLinus Torvalds __u32 ctsn; 7571da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7584244854dSNeil Horman struct sctp_association *aptr = (struct sctp_association *)asoc; 7591da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 76002015180SVlad Yasevich struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 7614244854dSNeil Horman struct sctp_transport *trans; 7621da177e4SLinus Torvalds 76302015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7641da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 765bb33381dSDaniel Borkmann 766bb33381dSDaniel Borkmann pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); 7671da177e4SLinus Torvalds 7681da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 76902015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7701da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7711da177e4SLinus Torvalds 7721da177e4SLinus Torvalds /* Initialize the SACK header. */ 7731da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7741da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7751da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7761da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7771da177e4SLinus Torvalds 7781da177e4SLinus Torvalds len = sizeof(sack) 7791da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7801da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds /* Create the chunk. */ 783072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len); 7841da177e4SLinus Torvalds if (!retval) 7851da177e4SLinus Torvalds goto nodata; 7861da177e4SLinus Torvalds 7871da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7881da177e4SLinus Torvalds * 7891da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7901da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7911da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7921da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7931da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7941da177e4SLinus Torvalds * reply chunk. 7951da177e4SLinus Torvalds * 7961da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 7971da177e4SLinus Torvalds * in packets from different source addresses in a single 7981da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 7991da177e4SLinus Torvalds * destination transport addresses from which the DATA or 8001da177e4SLinus Torvalds * control chunks being acknowledged were received. 8011da177e4SLinus Torvalds * 8021da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 8031da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 8041da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 8051da177e4SLinus Torvalds * duplicates. --piggy] 8061da177e4SLinus Torvalds * 8071da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 8081da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 8091da177e4SLinus Torvalds * destination address and not use the source address of the 8101da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 8111da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 8121da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 8131da177e4SLinus Torvalds * for the SACK is broken. 8141da177e4SLinus Torvalds * 8151da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 8161da177e4SLinus Torvalds */ 8171da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 8181da177e4SLinus Torvalds 8191da177e4SLinus Torvalds retval->subh.sack_hdr = 8201da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8211da177e4SLinus Torvalds 8221da177e4SLinus Torvalds /* Add the gap ack block information. */ 8231da177e4SLinus Torvalds if (num_gabs) 8241da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 82502015180SVlad Yasevich gabs); 8261da177e4SLinus Torvalds 8271da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 828196d6759SMichele Baldessari if (num_dup_tsns) { 829196d6759SMichele Baldessari aptr->stats.idupchunks += num_dup_tsns; 8301da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8311da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 832196d6759SMichele Baldessari } 8334244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8344244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8354244854dSNeil Horman * the association generation to 1 8364244854dSNeil Horman * 8374244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8384244854dSNeil Horman * association so no transport will match after a wrap event like this, 8394244854dSNeil Horman * Until the next sack 8404244854dSNeil Horman */ 8414244854dSNeil Horman if (++aptr->peer.sack_generation == 0) { 8424244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8434244854dSNeil Horman transports) 8444244854dSNeil Horman trans->sack_generation = 0; 8454244854dSNeil Horman aptr->peer.sack_generation = 1; 8464244854dSNeil Horman } 8471da177e4SLinus Torvalds nodata: 8481da177e4SLinus Torvalds return retval; 8491da177e4SLinus Torvalds } 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8521da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8531da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8541da177e4SLinus Torvalds { 8551da177e4SLinus Torvalds struct sctp_chunk *retval; 8561da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 8571da177e4SLinus Torvalds __u32 ctsn; 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8601da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8611da177e4SLinus Torvalds 862072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, 8631da177e4SLinus Torvalds sizeof(sctp_shutdownhdr_t)); 8641da177e4SLinus Torvalds if (!retval) 8651da177e4SLinus Torvalds goto nodata; 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8681da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds if (chunk) 8711da177e4SLinus Torvalds retval->transport = chunk->transport; 8721da177e4SLinus Torvalds nodata: 8731da177e4SLinus Torvalds return retval; 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8771da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8781da177e4SLinus Torvalds { 8791da177e4SLinus Torvalds struct sctp_chunk *retval; 8801da177e4SLinus Torvalds 881072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); 8821da177e4SLinus Torvalds 8831da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8841da177e4SLinus Torvalds * 8851da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8861da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8871da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8881da177e4SLinus Torvalds * to which it is replying. 8891da177e4SLinus Torvalds * 8901da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8911da177e4SLinus Torvalds */ 8921da177e4SLinus Torvalds if (retval && chunk) 8931da177e4SLinus Torvalds retval->transport = chunk->transport; 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds return retval; 8961da177e4SLinus Torvalds } 8971da177e4SLinus Torvalds 8981da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 8991da177e4SLinus Torvalds const struct sctp_association *asoc, 9001da177e4SLinus Torvalds const struct sctp_chunk *chunk) 9011da177e4SLinus Torvalds { 9021da177e4SLinus Torvalds struct sctp_chunk *retval; 9031da177e4SLinus Torvalds __u8 flags = 0; 9041da177e4SLinus Torvalds 905047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 906047a2428SJerome Forissier * reflected) 907047a2428SJerome Forissier */ 9081da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 9091da177e4SLinus Torvalds 910072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); 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 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 9201da177e4SLinus Torvalds * came from.] 9211da177e4SLinus Torvalds */ 9221da177e4SLinus Torvalds if (retval && chunk) 9231da177e4SLinus Torvalds retval->transport = chunk->transport; 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds return retval; 9261da177e4SLinus Torvalds } 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 929047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9301da177e4SLinus Torvalds */ 9311da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9321da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9331da177e4SLinus Torvalds const size_t hint) 9341da177e4SLinus Torvalds { 9351da177e4SLinus Torvalds struct sctp_chunk *retval; 9361da177e4SLinus Torvalds __u8 flags = 0; 9371da177e4SLinus Torvalds 938047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 939047a2428SJerome Forissier * an INIT (vtag will be reflected). 940047a2428SJerome Forissier */ 941047a2428SJerome Forissier if (!asoc) { 942047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 943047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 944047a2428SJerome Forissier flags = 0; 945047a2428SJerome Forissier else 946047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 947047a2428SJerome Forissier } 9481da177e4SLinus Torvalds 949072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint); 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9521da177e4SLinus Torvalds * 9531da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9541da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9551da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9561da177e4SLinus Torvalds * to which it is replying. 9571da177e4SLinus Torvalds * 9581da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9591da177e4SLinus Torvalds */ 9601da177e4SLinus Torvalds if (retval && chunk) 9611da177e4SLinus Torvalds retval->transport = chunk->transport; 9621da177e4SLinus Torvalds 9631da177e4SLinus Torvalds return retval; 9641da177e4SLinus Torvalds } 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9671da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9681da177e4SLinus Torvalds const struct sctp_association *asoc, 9691da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 9701da177e4SLinus Torvalds { 9711da177e4SLinus Torvalds struct sctp_chunk *retval; 9729f81bcd9SAl Viro __be32 payload; 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9751da177e4SLinus Torvalds + sizeof(tsn)); 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds if (!retval) 9781da177e4SLinus Torvalds goto no_mem; 9791da177e4SLinus Torvalds 9801da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9811da177e4SLinus Torvalds payload = htonl(tsn); 98200f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 98300f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9841da177e4SLinus Torvalds 9851da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9861da177e4SLinus Torvalds * 9871da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9881da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9891da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9901da177e4SLinus Torvalds * to which it is replying. 9911da177e4SLinus Torvalds * 9921da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9931da177e4SLinus Torvalds */ 9941da177e4SLinus Torvalds if (chunk) 9951da177e4SLinus Torvalds retval->transport = chunk->transport; 9961da177e4SLinus Torvalds 9971da177e4SLinus Torvalds no_mem: 9981da177e4SLinus Torvalds return retval; 9991da177e4SLinus Torvalds } 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 10021da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 1003c164a9baSSridhar Samudrala const struct msghdr *msg, 1004c164a9baSSridhar Samudrala size_t paylen) 10051da177e4SLinus Torvalds { 10061da177e4SLinus Torvalds struct sctp_chunk *retval; 1007c164a9baSSridhar Samudrala void *payload = NULL; 1008c164a9baSSridhar Samudrala int err; 10091da177e4SLinus Torvalds 1010c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 10111da177e4SLinus Torvalds if (!retval) 10121da177e4SLinus Torvalds goto err_chunk; 10131da177e4SLinus Torvalds 10141da177e4SLinus Torvalds if (paylen) { 10151da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 1016c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 10171da177e4SLinus Torvalds if (!payload) 10181da177e4SLinus Torvalds goto err_payload; 10191da177e4SLinus Torvalds 1020c164a9baSSridhar Samudrala err = memcpy_fromiovec(payload, msg->msg_iov, paylen); 1021c164a9baSSridhar Samudrala if (err < 0) 10221da177e4SLinus Torvalds goto err_copy; 10231da177e4SLinus Torvalds } 10241da177e4SLinus Torvalds 102500f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 102600f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds if (paylen) 10291da177e4SLinus Torvalds kfree(payload); 10301da177e4SLinus Torvalds 10311da177e4SLinus Torvalds return retval; 10321da177e4SLinus Torvalds 10331da177e4SLinus Torvalds err_copy: 10341da177e4SLinus Torvalds kfree(payload); 10351da177e4SLinus Torvalds err_payload: 10361da177e4SLinus Torvalds sctp_chunk_free(retval); 10371da177e4SLinus Torvalds retval = NULL; 10381da177e4SLinus Torvalds err_chunk: 10391da177e4SLinus Torvalds return retval; 10401da177e4SLinus Torvalds } 10411da177e4SLinus Torvalds 10425c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10435c94bf86SAdrian Bunk * enough. 10445c94bf86SAdrian Bunk */ 10455c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10465c94bf86SAdrian Bunk const void *data) 10475c94bf86SAdrian Bunk { 10485c94bf86SAdrian Bunk void *target; 10495c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 10505c94bf86SAdrian Bunk 10515c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10525c94bf86SAdrian Bunk 10536383cfb3SVlad Yasevich if (data) 10545c94bf86SAdrian Bunk memcpy(target, data, len); 10556383cfb3SVlad Yasevich else 10566383cfb3SVlad Yasevich memset(target, 0, len); 10575c94bf86SAdrian Bunk 10585c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10595c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10605c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10615c94bf86SAdrian Bunk 10625c94bf86SAdrian Bunk return target; 10635c94bf86SAdrian Bunk } 10645c94bf86SAdrian Bunk 10651da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10661da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10671da177e4SLinus Torvalds const struct sctp_association *asoc, 10681da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10691da177e4SLinus Torvalds const __u8 *payload, 10701da177e4SLinus Torvalds const size_t paylen) 10711da177e4SLinus Torvalds { 10721da177e4SLinus Torvalds struct sctp_chunk *retval; 10731da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10741da177e4SLinus Torvalds 10751da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 107600f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10771da177e4SLinus Torvalds if (!retval) 10781da177e4SLinus Torvalds goto end; 10791da177e4SLinus Torvalds 108000f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 108100f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10841da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 108500f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 108600f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 10871da177e4SLinus Torvalds 10881da177e4SLinus Torvalds end: 10891da177e4SLinus Torvalds return retval; 10901da177e4SLinus Torvalds } 10911da177e4SLinus Torvalds 1092ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1093ba016670SWei Yongjun const struct sctp_association *asoc, 1094ba016670SWei Yongjun const struct sctp_chunk *chunk, 1095ba016670SWei Yongjun struct sctp_paramhdr *param) 1096ba016670SWei Yongjun { 1097ba016670SWei Yongjun struct sctp_chunk *retval; 1098ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1099ba016670SWei Yongjun size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + 1100ba016670SWei Yongjun sizeof(sctp_paramhdr_t); 1101ba016670SWei Yongjun 1102ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1103ba016670SWei Yongjun if (!retval) 1104ba016670SWei Yongjun goto nodata; 1105ba016670SWei Yongjun 1106ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 1107ba016670SWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 1108ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 1109ba016670SWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); 1110ba016670SWei Yongjun 1111ba016670SWei Yongjun nodata: 1112ba016670SWei Yongjun return retval; 1113ba016670SWei Yongjun } 1114ba016670SWei Yongjun 1115de4594a5SNeil Horman struct sctp_chunk *sctp_make_violation_max_retrans( 1116de4594a5SNeil Horman const struct sctp_association *asoc, 1117de4594a5SNeil Horman const struct sctp_chunk *chunk) 1118de4594a5SNeil Horman { 1119de4594a5SNeil Horman struct sctp_chunk *retval; 1120de4594a5SNeil Horman static const char error[] = "Association exceeded its max_retans count"; 1121de4594a5SNeil Horman size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t); 1122de4594a5SNeil Horman 1123de4594a5SNeil Horman retval = sctp_make_abort(asoc, chunk, payload_len); 1124de4594a5SNeil Horman if (!retval) 1125de4594a5SNeil Horman goto nodata; 1126de4594a5SNeil Horman 1127de4594a5SNeil Horman sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); 1128de4594a5SNeil Horman sctp_addto_chunk(retval, sizeof(error), error); 1129de4594a5SNeil Horman 1130de4594a5SNeil Horman nodata: 1131de4594a5SNeil Horman return retval; 1132de4594a5SNeil Horman } 1133de4594a5SNeil Horman 11341da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11351da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 113692c73af5SWei Yongjun const struct sctp_transport *transport) 11371da177e4SLinus Torvalds { 113892c73af5SWei Yongjun struct sctp_chunk *retval; 113992c73af5SWei Yongjun sctp_sender_hb_info_t hbinfo; 114092c73af5SWei Yongjun 1141072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo)); 11421da177e4SLinus Torvalds 11431da177e4SLinus Torvalds if (!retval) 11441da177e4SLinus Torvalds goto nodata; 11451da177e4SLinus Torvalds 114692c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 114792c73af5SWei Yongjun hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t)); 114892c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 114992c73af5SWei Yongjun hbinfo.sent_at = jiffies; 115092c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 115192c73af5SWei Yongjun 11521da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11531da177e4SLinus Torvalds * what transport it belongs to. 11541da177e4SLinus Torvalds */ 11551da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 115692c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 115792c73af5SWei Yongjun &hbinfo); 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds nodata: 11601da177e4SLinus Torvalds return retval; 11611da177e4SLinus Torvalds } 11621da177e4SLinus Torvalds 11631da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11641da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11651da177e4SLinus Torvalds const void *payload, const size_t paylen) 11661da177e4SLinus Torvalds { 11671da177e4SLinus Torvalds struct sctp_chunk *retval; 11681da177e4SLinus Torvalds 1169072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); 11701da177e4SLinus Torvalds if (!retval) 11711da177e4SLinus Torvalds goto nodata; 11721da177e4SLinus Torvalds 11731da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11761da177e4SLinus Torvalds * 11771da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11781da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11791da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11801da177e4SLinus Torvalds * to which it is replying. 11811da177e4SLinus Torvalds * 11821da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 11831da177e4SLinus Torvalds */ 11841da177e4SLinus Torvalds if (chunk) 11851da177e4SLinus Torvalds retval->transport = chunk->transport; 11861da177e4SLinus Torvalds 11871da177e4SLinus Torvalds nodata: 11881da177e4SLinus Torvalds return retval; 11891da177e4SLinus Torvalds } 11901da177e4SLinus Torvalds 11911da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 11921da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 11931da177e4SLinus Torvalds */ 11941da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 11951da177e4SLinus Torvalds const struct sctp_association *asoc, 11961da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11971da177e4SLinus Torvalds size_t size) 11981da177e4SLinus Torvalds { 11991da177e4SLinus Torvalds struct sctp_chunk *retval; 12001da177e4SLinus Torvalds 1201072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 12021da177e4SLinus Torvalds sizeof(sctp_errhdr_t) + size); 12031da177e4SLinus Torvalds if (!retval) 12041da177e4SLinus Torvalds goto nodata; 12051da177e4SLinus Torvalds 12061da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12071da177e4SLinus Torvalds * 12081da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12091da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12101da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12111da177e4SLinus Torvalds * to which it is replying. 12121da177e4SLinus Torvalds * 12131da177e4SLinus Torvalds */ 12141da177e4SLinus Torvalds if (chunk) 12151da177e4SLinus Torvalds retval->transport = chunk->transport; 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds nodata: 12181da177e4SLinus Torvalds return retval; 12191da177e4SLinus Torvalds } 12201da177e4SLinus Torvalds 12215fa782c2SNeil Horman /* Create an Operation Error chunk of a fixed size, 12225fa782c2SNeil Horman * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) 12235fa782c2SNeil Horman * This is a helper function to allocate an error chunk for 12245fa782c2SNeil Horman * for those invalid parameter codes in which we may not want 1225d82603c6SJorrit Schippers * to report all the errors, if the incoming chunk is large 12265fa782c2SNeil Horman */ 12275fa782c2SNeil Horman static inline struct sctp_chunk *sctp_make_op_error_fixed( 12285fa782c2SNeil Horman const struct sctp_association *asoc, 12295fa782c2SNeil Horman const struct sctp_chunk *chunk) 12305fa782c2SNeil Horman { 12315fa782c2SNeil Horman size_t size = asoc ? asoc->pathmtu : 0; 12325fa782c2SNeil Horman 12335fa782c2SNeil Horman if (!size) 12345fa782c2SNeil Horman size = SCTP_DEFAULT_MAXSEGMENT; 12355fa782c2SNeil Horman 12365fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 12375fa782c2SNeil Horman } 12385fa782c2SNeil Horman 12391da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 12401da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12411da177e4SLinus Torvalds const struct sctp_chunk *chunk, 124263706c5cSAl Viro __be16 cause_code, const void *payload, 12436383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12441da177e4SLinus Torvalds { 12451da177e4SLinus Torvalds struct sctp_chunk *retval; 12461da177e4SLinus Torvalds 12476383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12481da177e4SLinus Torvalds if (!retval) 12491da177e4SLinus Torvalds goto nodata; 12501da177e4SLinus Torvalds 12516383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 125200f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12536383cfb3SVlad Yasevich if (reserve_tail) 12546383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12551da177e4SLinus Torvalds 12561da177e4SLinus Torvalds nodata: 12571da177e4SLinus Torvalds return retval; 12581da177e4SLinus Torvalds } 12591da177e4SLinus Torvalds 12604cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 12614cd57c80SVlad Yasevich { 12624cd57c80SVlad Yasevich struct sctp_chunk *retval; 12634cd57c80SVlad Yasevich struct sctp_hmac *hmac_desc; 12644cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 12654cd57c80SVlad Yasevich __u8 *hmac; 12664cd57c80SVlad Yasevich 12674cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12684cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12694cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12704cd57c80SVlad Yasevich return NULL; 12714cd57c80SVlad Yasevich 1272072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 12734cd57c80SVlad Yasevich hmac_desc->hmac_len + sizeof(sctp_authhdr_t)); 12744cd57c80SVlad Yasevich if (!retval) 12754cd57c80SVlad Yasevich return NULL; 12764cd57c80SVlad Yasevich 12774cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 12784cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 12794cd57c80SVlad Yasevich 12804cd57c80SVlad Yasevich retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), 12814cd57c80SVlad Yasevich &auth_hdr); 12824cd57c80SVlad Yasevich 12834cd57c80SVlad Yasevich hmac = skb_put(retval->skb, hmac_desc->hmac_len); 12844cd57c80SVlad Yasevich memset(hmac, 0, hmac_desc->hmac_len); 12854cd57c80SVlad Yasevich 12864cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 12874cd57c80SVlad Yasevich retval->chunk_hdr->length = 12884cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 12894cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 12904cd57c80SVlad Yasevich 12914cd57c80SVlad Yasevich return retval; 12924cd57c80SVlad Yasevich } 12934cd57c80SVlad Yasevich 12944cd57c80SVlad Yasevich 12951da177e4SLinus Torvalds /******************************************************************** 12961da177e4SLinus Torvalds * 2nd Level Abstractions 12971da177e4SLinus Torvalds ********************************************************************/ 12981da177e4SLinus Torvalds 12991da177e4SLinus Torvalds /* Turn an skb into a chunk. 13001da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13013dc0a548Swangweidong * 13023dc0a548Swangweidong * sctpimpguide-05.txt Section 2.8.2 13033dc0a548Swangweidong * M1) Each time a new DATA chunk is transmitted 13043dc0a548Swangweidong * set the 'TSN.Missing.Report' count for that TSN to 0. The 13053dc0a548Swangweidong * 'TSN.Missing.Report' count will be used to determine missing chunks 13063dc0a548Swangweidong * and when to fast retransmit. 13073dc0a548Swangweidong * 13081da177e4SLinus Torvalds */ 13091da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13101da177e4SLinus Torvalds const struct sctp_association *asoc, 13111da177e4SLinus Torvalds struct sock *sk) 13121da177e4SLinus Torvalds { 13131da177e4SLinus Torvalds struct sctp_chunk *retval; 13141da177e4SLinus Torvalds 1315c3762229SRobert P. J. Day retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC); 13161da177e4SLinus Torvalds 13171da177e4SLinus Torvalds if (!retval) 13181da177e4SLinus Torvalds goto nodata; 1319bb33381dSDaniel Borkmann if (!sk) 1320bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13211da177e4SLinus Torvalds 132279af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13231da177e4SLinus Torvalds retval->skb = skb; 13241da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13251da177e4SLinus Torvalds retval->singleton = 1; 13261da177e4SLinus Torvalds 1327c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13281da177e4SLinus Torvalds 13291da177e4SLinus Torvalds /* Polish the bead hole. */ 13301da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13311da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13321da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 13331da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 13341da177e4SLinus Torvalds 13351da177e4SLinus Torvalds nodata: 13361da177e4SLinus Torvalds return retval; 13371da177e4SLinus Torvalds } 13381da177e4SLinus Torvalds 13391da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13401da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13411da177e4SLinus Torvalds union sctp_addr *dest) 13421da177e4SLinus Torvalds { 1343f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 134416b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13451da177e4SLinus Torvalds } 13461da177e4SLinus Torvalds 13471da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13481da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13491da177e4SLinus Torvalds { 13501da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13511da177e4SLinus Torvalds if (chunk->transport) { 13526a1e5f33SAl Viro return &chunk->transport->ipaddr; 13531da177e4SLinus Torvalds } else { 13541da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13556a1e5f33SAl Viro return &chunk->source; 13561da177e4SLinus Torvalds } 13571da177e4SLinus Torvalds } 13581da177e4SLinus Torvalds 13591da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13601da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13611da177e4SLinus Torvalds */ 1362072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 13631da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen) 13641da177e4SLinus Torvalds { 13651da177e4SLinus Torvalds struct sctp_chunk *retval; 13661da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 13671da177e4SLinus Torvalds struct sk_buff *skb; 13681da177e4SLinus Torvalds struct sock *sk; 13691da177e4SLinus Torvalds 13701da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 13711da177e4SLinus Torvalds skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), 13721da177e4SLinus Torvalds GFP_ATOMIC); 13731da177e4SLinus Torvalds if (!skb) 13741da177e4SLinus Torvalds goto nodata; 13751da177e4SLinus Torvalds 13761da177e4SLinus Torvalds /* Make room for the chunk header. */ 13771da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 13781da177e4SLinus Torvalds chunk_hdr->type = type; 13791da177e4SLinus Torvalds chunk_hdr->flags = flags; 13801da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 13811da177e4SLinus Torvalds 13821da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 13831da177e4SLinus Torvalds retval = sctp_chunkify(skb, asoc, sk); 13841da177e4SLinus Torvalds if (!retval) { 13851da177e4SLinus Torvalds kfree_skb(skb); 13861da177e4SLinus Torvalds goto nodata; 13871da177e4SLinus Torvalds } 13881da177e4SLinus Torvalds 13891da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 13901da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 13911da177e4SLinus Torvalds 13924cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 13934cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 13944cd57c80SVlad Yasevich retval->auth = 1; 13954cd57c80SVlad Yasevich 13961da177e4SLinus Torvalds return retval; 13971da177e4SLinus Torvalds nodata: 13981da177e4SLinus Torvalds return NULL; 13991da177e4SLinus Torvalds } 14001da177e4SLinus Torvalds 1401072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1402072017b4SVlad Yasevich __u8 flags, int paylen) 1403072017b4SVlad Yasevich { 1404072017b4SVlad Yasevich return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen); 1405072017b4SVlad Yasevich } 1406072017b4SVlad Yasevich 1407072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1408072017b4SVlad Yasevich __u8 type, __u8 flags, int paylen) 1409072017b4SVlad Yasevich { 1410072017b4SVlad Yasevich struct sctp_chunk *chunk = _sctp_make_chunk(asoc, type, flags, paylen); 1411072017b4SVlad Yasevich 1412072017b4SVlad Yasevich if (chunk) 1413072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1414072017b4SVlad Yasevich 1415072017b4SVlad Yasevich return chunk; 1416072017b4SVlad Yasevich } 14171da177e4SLinus Torvalds 14181da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14191da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14201da177e4SLinus Torvalds { 1421a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1422a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1423a08de64dSVlad Yasevich 1424c485658bSDaniel Borkmann consume_skb(chunk->skb); 1425c485658bSDaniel Borkmann consume_skb(chunk->auth_chunk); 14261da177e4SLinus Torvalds 14271da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 14281da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 14291da177e4SLinus Torvalds } 14301da177e4SLinus Torvalds 14311da177e4SLinus Torvalds /* Possibly, free the chunk. */ 14321da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 14331da177e4SLinus Torvalds { 14341da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 14351da177e4SLinus Torvalds if (chunk->msg) 14361da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 14371da177e4SLinus Torvalds 14381da177e4SLinus Torvalds sctp_chunk_put(chunk); 14391da177e4SLinus Torvalds } 14401da177e4SLinus Torvalds 14411da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14421da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14431da177e4SLinus Torvalds { 14441da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 14451da177e4SLinus Torvalds } 14461da177e4SLinus Torvalds 14471da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14481da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14491da177e4SLinus Torvalds { 14501da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 14511da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14521da177e4SLinus Torvalds } 14531da177e4SLinus Torvalds 14541da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14551da177e4SLinus Torvalds * enough. 14561da177e4SLinus Torvalds */ 14571da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14581da177e4SLinus Torvalds { 14591da177e4SLinus Torvalds void *target; 14601da177e4SLinus Torvalds void *padding; 14611da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 14628d614adeSWei Yongjun int padlen = WORD_ROUND(chunklen) - chunklen; 14631da177e4SLinus Torvalds 14641da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 14651da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14661da177e4SLinus Torvalds 14671da177e4SLinus Torvalds memset(padding, 0, padlen); 14681da177e4SLinus Torvalds memcpy(target, data, len); 14691da177e4SLinus Torvalds 14701da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14711da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 147227a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14731da177e4SLinus Torvalds 14741da177e4SLinus Torvalds return target; 14751da177e4SLinus Torvalds } 14761da177e4SLinus Torvalds 14775fa782c2SNeil Horman /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient 14785fa782c2SNeil Horman * space in the chunk 14795fa782c2SNeil Horman */ 14806daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, 14815fa782c2SNeil Horman int len, const void *data) 14825fa782c2SNeil Horman { 14832e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) >= len) 14845fa782c2SNeil Horman return sctp_addto_chunk(chunk, len, data); 14855fa782c2SNeil Horman else 14865fa782c2SNeil Horman return NULL; 14875fa782c2SNeil Horman } 14885fa782c2SNeil Horman 14891da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 14901da177e4SLinus Torvalds * chunk is not big enough. 14911da177e4SLinus Torvalds * Returns a kernel err value. 14921da177e4SLinus Torvalds */ 14931da177e4SLinus Torvalds int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 14941da177e4SLinus Torvalds struct iovec *data) 14951da177e4SLinus Torvalds { 14961da177e4SLinus Torvalds __u8 *target; 14971da177e4SLinus Torvalds int err = 0; 14981da177e4SLinus Torvalds 14991da177e4SLinus Torvalds /* Make room in chunk for data. */ 15001da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15011da177e4SLinus Torvalds 15021da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 15031da177e4SLinus Torvalds if ((err = memcpy_fromiovecend(target, data, off, len))) 15041da177e4SLinus Torvalds goto out; 15051da177e4SLinus Torvalds 15061da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15071da177e4SLinus Torvalds chunk->chunk_hdr->length = 15081da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 150927a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15101da177e4SLinus Torvalds 15111da177e4SLinus Torvalds out: 15121da177e4SLinus Torvalds return err; 15131da177e4SLinus Torvalds } 15141da177e4SLinus Torvalds 15151da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15161da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15171da177e4SLinus Torvalds */ 15181da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15191da177e4SLinus Torvalds { 1520ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1521ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1522ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 15231da177e4SLinus Torvalds __u16 ssn; 15241da177e4SLinus Torvalds __u16 sid; 15251da177e4SLinus Torvalds 15261da177e4SLinus Torvalds if (chunk->has_ssn) 15271da177e4SLinus Torvalds return; 15281da177e4SLinus Torvalds 1529ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1530ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1531ab3e5e7bSVlad Yasevich stream = &chunk->asoc->ssnmap->out; 1532ab3e5e7bSVlad Yasevich 1533ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1534ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1535ab3e5e7bSVlad Yasevich */ 1536ab3e5e7bSVlad Yasevich msg = chunk->msg; 1537ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1538ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15391da177e4SLinus Torvalds ssn = 0; 15401da177e4SLinus Torvalds } else { 1541ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1542ab3e5e7bSVlad Yasevich ssn = sctp_ssn_next(stream, sid); 15431da177e4SLinus Torvalds else 1544ab3e5e7bSVlad Yasevich ssn = sctp_ssn_peek(stream, sid); 15451da177e4SLinus Torvalds } 15461da177e4SLinus Torvalds 1547ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1548ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1549ab3e5e7bSVlad Yasevich } 15501da177e4SLinus Torvalds } 15511da177e4SLinus Torvalds 15521da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15531da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15541da177e4SLinus Torvalds */ 15551da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15561da177e4SLinus Torvalds { 15571da177e4SLinus Torvalds if (!chunk->has_tsn) { 15581da177e4SLinus Torvalds /* This is the last possible instant to 15591da177e4SLinus Torvalds * assign a TSN. 15601da177e4SLinus Torvalds */ 15611da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15621da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15631da177e4SLinus Torvalds chunk->has_tsn = 1; 15641da177e4SLinus Torvalds } 15651da177e4SLinus Torvalds } 15661da177e4SLinus Torvalds 15671da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15681da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15693182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1570dd0fc66fSAl Viro gfp_t gfp) 15711da177e4SLinus Torvalds { 15721da177e4SLinus Torvalds struct sctp_association *asoc; 15731da177e4SLinus Torvalds struct sk_buff *skb; 15741da177e4SLinus Torvalds sctp_scope_t scope; 15751da177e4SLinus Torvalds struct sctp_af *af; 15761da177e4SLinus Torvalds 15771da177e4SLinus Torvalds /* Create the bare association. */ 15781da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15791da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15801da177e4SLinus Torvalds if (!asoc) 15811da177e4SLinus Torvalds goto nodata; 15821da177e4SLinus Torvalds asoc->temp = 1; 15831da177e4SLinus Torvalds skb = chunk->skb; 15841da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1585eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); 15861da177e4SLinus Torvalds if (unlikely(!af)) 15871da177e4SLinus Torvalds goto fail; 1588d55c41b1SAl Viro af->from_skb(&asoc->c.peer_addr, skb, 1); 15891da177e4SLinus Torvalds nodata: 15901da177e4SLinus Torvalds return asoc; 15911da177e4SLinus Torvalds 15921da177e4SLinus Torvalds fail: 15931da177e4SLinus Torvalds sctp_association_free(asoc); 15941da177e4SLinus Torvalds return NULL; 15951da177e4SLinus Torvalds } 15961da177e4SLinus Torvalds 15971da177e4SLinus Torvalds /* Build a cookie representing asoc. 15981da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 15991da177e4SLinus Torvalds */ 16001da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 16011da177e4SLinus Torvalds const struct sctp_association *asoc, 16021da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 16031da177e4SLinus Torvalds int *cookie_len, 16041da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 16051da177e4SLinus Torvalds { 16061da177e4SLinus Torvalds sctp_cookie_param_t *retval; 16071da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 16081da177e4SLinus Torvalds struct scatterlist sg; 16091da177e4SLinus Torvalds int headersize, bodysize; 16101da177e4SLinus Torvalds 16119834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16129834a2bbSVlad Yasevich * any padding. 16139834a2bbSVlad Yasevich */ 16149834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 16159834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16169834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16171da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16181da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16191da177e4SLinus Torvalds 16201da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16211da177e4SLinus Torvalds * functions simpler to write. 16221da177e4SLinus Torvalds */ 16231da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16241da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16251da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16261da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16271da177e4SLinus Torvalds 16281da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16291da177e4SLinus Torvalds * out on the network. 16301da177e4SLinus Torvalds */ 1631af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1632af997d8cSArnaldo Carvalho de Melo if (!retval) 1633af997d8cSArnaldo Carvalho de Melo goto nodata; 1634af997d8cSArnaldo Carvalho de Melo 16351da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16361da177e4SLinus Torvalds 16371da177e4SLinus Torvalds /* Set up the parameter header. */ 16381da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16391da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16401da177e4SLinus Torvalds 16411da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16421da177e4SLinus Torvalds cookie->c = asoc->c; 16431da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16441da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16451da177e4SLinus Torvalds 16461da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16471da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16481da177e4SLinus Torvalds 16490f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16500f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16511da177e4SLinus Torvalds 16521da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 165352db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 165452db882fSDaniel Borkmann ktime_get()); 16551da177e4SLinus Torvalds 16561da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16571da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16581da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16591da177e4SLinus Torvalds 16601da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16611da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16621da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16631da177e4SLinus Torvalds 16641da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16651b489e11SHerbert Xu struct hash_desc desc; 16661b489e11SHerbert Xu 16671da177e4SLinus Torvalds /* Sign the message. */ 166868e3f5ddSHerbert Xu sg_init_one(&sg, &cookie->c, bodysize); 16691b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 16701b489e11SHerbert Xu desc.flags = 0; 16711da177e4SLinus Torvalds 1672570617e7SDaniel Borkmann if (crypto_hash_setkey(desc.tfm, ep->secret_key, 1673570617e7SDaniel Borkmann sizeof(ep->secret_key)) || 16741b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) 16751b489e11SHerbert Xu goto free_cookie; 16761da177e4SLinus Torvalds } 16771da177e4SLinus Torvalds 16781da177e4SLinus Torvalds return retval; 16791b489e11SHerbert Xu 16801b489e11SHerbert Xu free_cookie: 16811b489e11SHerbert Xu kfree(retval); 16821b489e11SHerbert Xu nodata: 16831b489e11SHerbert Xu *cookie_len = 0; 16841b489e11SHerbert Xu return NULL; 16851da177e4SLinus Torvalds } 16861da177e4SLinus Torvalds 16871da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 16881da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 16891da177e4SLinus Torvalds const struct sctp_endpoint *ep, 16901da177e4SLinus Torvalds const struct sctp_association *asoc, 1691dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 16921da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 16931da177e4SLinus Torvalds { 16941da177e4SLinus Torvalds struct sctp_association *retval = NULL; 16951da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 16961da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 16971da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1698313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 16991da177e4SLinus Torvalds struct scatterlist sg; 1700570617e7SDaniel Borkmann unsigned int len; 17011da177e4SLinus Torvalds sctp_scope_t scope; 17021da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 170352db882fSDaniel Borkmann ktime_t kt; 17041b489e11SHerbert Xu struct hash_desc desc; 17051da177e4SLinus Torvalds 17069834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17079834a2bbSVlad Yasevich * any padding. 17089834a2bbSVlad Yasevich */ 17099834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 17109834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17119834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17121da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17131da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17141da177e4SLinus Torvalds 17151da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17161da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17171da177e4SLinus Torvalds * INIT chunk. 17181da177e4SLinus Torvalds */ 17191da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17201da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17211da177e4SLinus Torvalds goto malformed; 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17241da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17251da177e4SLinus Torvalds goto malformed; 17261da177e4SLinus Torvalds 17271da177e4SLinus Torvalds /* Process the cookie. */ 17281da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17291da177e4SLinus Torvalds bear_cookie = &cookie->c; 17301da177e4SLinus Torvalds 17311da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17321da177e4SLinus Torvalds goto no_hmac; 17331da177e4SLinus Torvalds 17341da177e4SLinus Torvalds /* Check the signature. */ 173568e3f5ddSHerbert Xu sg_init_one(&sg, bear_cookie, bodysize); 17361b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 17371b489e11SHerbert Xu desc.flags = 0; 17381da177e4SLinus Torvalds 17398ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 1740570617e7SDaniel Borkmann if (crypto_hash_setkey(desc.tfm, ep->secret_key, 1741570617e7SDaniel Borkmann sizeof(ep->secret_key)) || 17421b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 17431b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17441b489e11SHerbert Xu goto fail; 17451b489e11SHerbert Xu } 17461da177e4SLinus Torvalds 17471da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17481da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17491da177e4SLinus Torvalds goto fail; 17501da177e4SLinus Torvalds } 17511da177e4SLinus Torvalds 17521da177e4SLinus Torvalds no_hmac: 17531da177e4SLinus Torvalds /* IG Section 2.35.2: 17541da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17551da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17561da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17571da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17581da177e4SLinus Torvalds * discarded, 17591da177e4SLinus Torvalds */ 17601da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17611da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17621da177e4SLinus Torvalds goto fail; 17631da177e4SLinus Torvalds } 17641da177e4SLinus Torvalds 17659b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17661da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17671da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17681da177e4SLinus Torvalds goto fail; 17691da177e4SLinus Torvalds } 17701da177e4SLinus Torvalds 17711da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17721da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17731da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1774f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1775f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1776f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1777f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17781da177e4SLinus Torvalds */ 1779f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 178052db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1781f236218bSVlad Yasevich else 178252db882fSDaniel Borkmann kt = ktime_get(); 1783f236218bSVlad Yasevich 178452db882fSDaniel Borkmann if (!asoc && ktime_compare(bear_cookie->expiration, kt) < 0) { 17851da177e4SLinus Torvalds /* 17861da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 17871da177e4SLinus Torvalds * 17881da177e4SLinus Torvalds * Cause of error 17891da177e4SLinus Torvalds * --------------- 17901da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 17911da177e4SLinus Torvalds * Cookie that has expired. 17921da177e4SLinus Torvalds */ 17931da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17941da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 17951da177e4SLinus Torvalds if (*errp) { 179652db882fSDaniel Borkmann suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 179734bcca28SAl Viro __be32 n = htonl(usecs); 17981da177e4SLinus Torvalds 17991da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 180000f1c2dfSWei Yongjun sizeof(n)); 180100f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 18021da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18031da177e4SLinus Torvalds } else 18041da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18051da177e4SLinus Torvalds 18061da177e4SLinus Torvalds goto fail; 18071da177e4SLinus Torvalds } 18081da177e4SLinus Torvalds 18091da177e4SLinus Torvalds /* Make a new base association. */ 18101da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18111da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18121da177e4SLinus Torvalds if (!retval) { 18131da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18141da177e4SLinus Torvalds goto fail; 18151da177e4SLinus Torvalds } 18161da177e4SLinus Torvalds 18171da177e4SLinus Torvalds /* Set up our peer's port number. */ 18181da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18191da177e4SLinus Torvalds 18201da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18211da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18221da177e4SLinus Torvalds 18231da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18241da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18251da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18261da177e4SLinus Torvalds goto fail; 18271da177e4SLinus Torvalds } 18281da177e4SLinus Torvalds 18291da177e4SLinus Torvalds /* Also, add the destination address. */ 18301da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1831f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1832f57d96b2SVlad Yasevich SCTP_ADDR_SRC, GFP_ATOMIC); 18331da177e4SLinus Torvalds } 18341da177e4SLinus Torvalds 18351da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18361da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18371da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 18381da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18391da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18400f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18411da177e4SLinus Torvalds 18421da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18431da177e4SLinus Torvalds return retval; 18441da177e4SLinus Torvalds 18451da177e4SLinus Torvalds fail: 18461da177e4SLinus Torvalds if (retval) 18471da177e4SLinus Torvalds sctp_association_free(retval); 18481da177e4SLinus Torvalds 18491da177e4SLinus Torvalds return NULL; 18501da177e4SLinus Torvalds 18511da177e4SLinus Torvalds malformed: 18521da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18531da177e4SLinus Torvalds * malformed. 18541da177e4SLinus Torvalds */ 18551da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18561da177e4SLinus Torvalds goto fail; 18571da177e4SLinus Torvalds } 18581da177e4SLinus Torvalds 18591da177e4SLinus Torvalds /******************************************************************** 18601da177e4SLinus Torvalds * 3rd Level Abstractions 18611da177e4SLinus Torvalds ********************************************************************/ 18621da177e4SLinus Torvalds 18631da177e4SLinus Torvalds struct __sctp_missing { 18649f81bcd9SAl Viro __be32 num_missing; 18659f81bcd9SAl Viro __be16 type; 1866bc10502dSEric Dumazet } __packed; 18671da177e4SLinus Torvalds 18681da177e4SLinus Torvalds /* 18691da177e4SLinus Torvalds * Report a missing mandatory parameter. 18701da177e4SLinus Torvalds */ 18711da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 18721da177e4SLinus Torvalds sctp_param_t paramtype, 18731da177e4SLinus Torvalds struct sctp_chunk *chunk, 18741da177e4SLinus Torvalds struct sctp_chunk **errp) 18751da177e4SLinus Torvalds { 18761da177e4SLinus Torvalds struct __sctp_missing report; 18771da177e4SLinus Torvalds __u16 len; 18781da177e4SLinus Torvalds 18791da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 18801da177e4SLinus Torvalds 18811da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 18821da177e4SLinus Torvalds * returning multiple unknown parameters. 18831da177e4SLinus Torvalds */ 18841da177e4SLinus Torvalds if (!*errp) 18851da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18861da177e4SLinus Torvalds 18871da177e4SLinus Torvalds if (*errp) { 18881da177e4SLinus Torvalds report.num_missing = htonl(1); 18891da177e4SLinus Torvalds report.type = paramtype; 1890ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 189100f1c2dfSWei Yongjun sizeof(report)); 189200f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 18931da177e4SLinus Torvalds } 18941da177e4SLinus Torvalds 18951da177e4SLinus Torvalds /* Stop processing this chunk. */ 18961da177e4SLinus Torvalds return 0; 18971da177e4SLinus Torvalds } 18981da177e4SLinus Torvalds 18991da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19001da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19011da177e4SLinus Torvalds struct sctp_chunk *chunk, 19021da177e4SLinus Torvalds struct sctp_chunk **errp) 19031da177e4SLinus Torvalds { 19041da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19051da177e4SLinus Torvalds 19061da177e4SLinus Torvalds if (!*errp) 19071da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19081da177e4SLinus Torvalds 19091da177e4SLinus Torvalds if (*errp) 191000f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19111da177e4SLinus Torvalds 19121da177e4SLinus Torvalds /* Stop processing this chunk. */ 19131da177e4SLinus Torvalds return 0; 19141da177e4SLinus Torvalds } 19151da177e4SLinus Torvalds 19161da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19171da177e4SLinus Torvalds struct sctp_paramhdr *param, 19181da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19191da177e4SLinus Torvalds struct sctp_chunk **errp) 19201da177e4SLinus Torvalds { 19217ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19227ab90804SVlad Yasevich * not reported. 19237ab90804SVlad Yasevich */ 19247ab90804SVlad Yasevich if (*errp) 19257ab90804SVlad Yasevich sctp_chunk_free(*errp); 19267ab90804SVlad Yasevich 19271da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1928ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19291da177e4SLinus Torvalds 19301da177e4SLinus Torvalds return 0; 19311da177e4SLinus Torvalds } 19321da177e4SLinus Torvalds 19331da177e4SLinus Torvalds 19341da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19351da177e4SLinus Torvalds * send back an indicator to the peer. 19361da177e4SLinus Torvalds */ 19371da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19381da177e4SLinus Torvalds union sctp_params param, 19391da177e4SLinus Torvalds struct sctp_chunk *chunk, 19401da177e4SLinus Torvalds struct sctp_chunk **errp) 19411da177e4SLinus Torvalds { 19421da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19431da177e4SLinus Torvalds 19447ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19457ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19467ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19477ab90804SVlad Yasevich * them in the ABORT. 19487ab90804SVlad Yasevich */ 19497ab90804SVlad Yasevich if (*errp) 19507ab90804SVlad Yasevich sctp_chunk_free(*errp); 19517ab90804SVlad Yasevich 19521da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19531da177e4SLinus Torvalds 195400f1c2dfSWei Yongjun if (*errp) { 195500f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 195600f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 195700f1c2dfSWei Yongjun } 19581da177e4SLinus Torvalds 19591da177e4SLinus Torvalds /* Stop processing this chunk. */ 19601da177e4SLinus Torvalds return 0; 19611da177e4SLinus Torvalds } 19621da177e4SLinus Torvalds 1963f53b5b09SEric W. Biederman static int sctp_verify_ext_param(struct net *net, union sctp_params param) 1964d6701191SVlad Yasevich { 1965d6701191SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1966d6701191SVlad Yasevich int have_auth = 0; 1967d6701191SVlad Yasevich int have_asconf = 0; 1968d6701191SVlad Yasevich int i; 1969d6701191SVlad Yasevich 1970d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1971d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1972d6701191SVlad Yasevich case SCTP_CID_AUTH: 1973d6701191SVlad Yasevich have_auth = 1; 1974d6701191SVlad Yasevich break; 1975d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1976d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1977d6701191SVlad Yasevich have_asconf = 1; 1978d6701191SVlad Yasevich break; 1979d6701191SVlad Yasevich } 1980d6701191SVlad Yasevich } 1981d6701191SVlad Yasevich 1982d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1983d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 1984d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 1985d6701191SVlad Yasevich * mode. 1986d6701191SVlad Yasevich */ 1987e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 1988d6701191SVlad Yasevich return 1; 1989d6701191SVlad Yasevich 1990e1fc3b14SEric W. Biederman if (net->sctp.addip_enable && !have_auth && have_asconf) 1991d6701191SVlad Yasevich return 0; 1992d6701191SVlad Yasevich 1993d6701191SVlad Yasevich return 1; 1994d6701191SVlad Yasevich } 1995d6701191SVlad Yasevich 1996131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 1997131a47e3SVlad Yasevich union sctp_params param) 1998131a47e3SVlad Yasevich { 1999e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2000131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 2001131a47e3SVlad Yasevich int i; 2002131a47e3SVlad Yasevich 2003131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2004131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2005131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 2006f7010e61Swangweidong if (net->sctp.prsctp_enable && !asoc->peer.prsctp_capable) 2007131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2008131a47e3SVlad Yasevich break; 2009730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2010730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2011730fc3d0SVlad Yasevich * supports AUTH. 2012730fc3d0SVlad Yasevich */ 2013e1fc3b14SEric W. Biederman if (net->sctp.auth_enable) 2014730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2015730fc3d0SVlad Yasevich break; 2016131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2017131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2018e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 201988799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20206b2f9cb6SVlad Yasevich break; 2021131a47e3SVlad Yasevich default: 2022131a47e3SVlad Yasevich break; 2023131a47e3SVlad Yasevich } 2024131a47e3SVlad Yasevich } 2025131a47e3SVlad Yasevich } 2026131a47e3SVlad Yasevich 20271da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20281da177e4SLinus Torvalds * 20291da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20301da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20311da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20321da177e4SLinus Torvalds * Parameter Type. 20331da177e4SLinus Torvalds * 20347ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20357ab90804SVlad Yasevich * parameters within this chunk 20361da177e4SLinus Torvalds * 20377ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20387ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20397ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20401da177e4SLinus Torvalds * 20411da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20421da177e4SLinus Torvalds * 20431da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20441da177e4SLinus Torvalds * report the unrecognized parameter in an 20457ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20461da177e4SLinus Torvalds * 20471da177e4SLinus Torvalds * Return value: 20487ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20497ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20507ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20511da177e4SLinus Torvalds */ 20527ab90804SVlad Yasevich static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, 20531da177e4SLinus Torvalds union sctp_params param, 20541da177e4SLinus Torvalds struct sctp_chunk *chunk, 20551da177e4SLinus Torvalds struct sctp_chunk **errp) 20561da177e4SLinus Torvalds { 20577ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20581da177e4SLinus Torvalds 20591da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20601da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20617ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20621da177e4SLinus Torvalds break; 20631da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20641da177e4SLinus Torvalds break; 20657ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20667ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20677ab90804SVlad Yasevich /* Fall through */ 20681da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20691da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20701da177e4SLinus Torvalds * returning multiple unknown parameters. 20711da177e4SLinus Torvalds */ 20721da177e4SLinus Torvalds if (NULL == *errp) 20735fa782c2SNeil Horman *errp = sctp_make_op_error_fixed(asoc, chunk); 20741da177e4SLinus Torvalds 20751da177e4SLinus Torvalds if (*errp) { 20762205a6eaSJiri Bohac if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, 20772205a6eaSJiri Bohac WORD_ROUND(ntohs(param.p->length)))) 20785fa782c2SNeil Horman sctp_addto_chunk_fixed(*errp, 207900f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 208000f1c2dfSWei Yongjun param.v); 20811da177e4SLinus Torvalds } else { 20821da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 20831da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 20841da177e4SLinus Torvalds * to the peer and the association won't be 20851da177e4SLinus Torvalds * established. 20861da177e4SLinus Torvalds */ 20877ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 20881da177e4SLinus Torvalds } 20891da177e4SLinus Torvalds break; 20901da177e4SLinus Torvalds default: 20911da177e4SLinus Torvalds break; 20921da177e4SLinus Torvalds } 20931da177e4SLinus Torvalds 20941da177e4SLinus Torvalds return retval; 20951da177e4SLinus Torvalds } 20961da177e4SLinus Torvalds 20977ab90804SVlad Yasevich /* Verify variable length parameters 20981da177e4SLinus Torvalds * Return values: 20997ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21007ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21017ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21027ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21031da177e4SLinus Torvalds */ 2104f53b5b09SEric W. Biederman static sctp_ierror_t sctp_verify_param(struct net *net, 2105f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21061da177e4SLinus Torvalds union sctp_params param, 21071da177e4SLinus Torvalds sctp_cid_t cid, 21081da177e4SLinus Torvalds struct sctp_chunk *chunk, 21091da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21101da177e4SLinus Torvalds { 211172da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21127ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 211372da7b38SWei Yongjun __u16 n_elt, id = 0; 211472da7b38SWei Yongjun int i; 21151da177e4SLinus Torvalds 21161da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21171da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21181da177e4SLinus Torvalds * identified based on the chunk id. 21191da177e4SLinus Torvalds */ 21201da177e4SLinus Torvalds 21211da177e4SLinus Torvalds switch (param.p->type) { 21221da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21231da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21241da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21251da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21261da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21271da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21281da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21291da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21300f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2131d6701191SVlad Yasevich break; 2132d6701191SVlad Yasevich 2133131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2134f53b5b09SEric W. Biederman if (!sctp_verify_ext_param(net, param)) 2135d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21361da177e4SLinus Torvalds break; 21371da177e4SLinus Torvalds 2138d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2139e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 2140d6de3097SVlad Yasevich break; 2141d6de3097SVlad Yasevich goto fallthrough; 2142d6de3097SVlad Yasevich 21431da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21441da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21457ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21467ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21477ab90804SVlad Yasevich break; 2148131a47e3SVlad Yasevich 21491da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 2150e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 21511da177e4SLinus Torvalds break; 2152730fc3d0SVlad Yasevich goto fallthrough; 2153730fc3d0SVlad Yasevich 2154730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2155e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2156730fc3d0SVlad Yasevich goto fallthrough; 2157730fc3d0SVlad Yasevich 2158730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2159730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2160730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2161730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2162730fc3d0SVlad Yasevich */ 2163730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 21647ab90804SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { 21657ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2166730fc3d0SVlad Yasevich chunk, err_chunk); 21677ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21687ab90804SVlad Yasevich } 2169730fc3d0SVlad Yasevich break; 2170730fc3d0SVlad Yasevich 2171730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2172e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2173730fc3d0SVlad Yasevich goto fallthrough; 2174730fc3d0SVlad Yasevich 2175730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2176730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2177730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2178730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2179730fc3d0SVlad Yasevich */ 21807ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 21817ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2182730fc3d0SVlad Yasevich chunk, err_chunk); 21837ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21847ab90804SVlad Yasevich } 2185730fc3d0SVlad Yasevich break; 2186730fc3d0SVlad Yasevich 2187730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2188e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 218972da7b38SWei Yongjun goto fallthrough; 219072da7b38SWei Yongjun 219172da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 219272da7b38SWei Yongjun n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; 219372da7b38SWei Yongjun 219472da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 219572da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 219672da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 219772da7b38SWei Yongjun */ 219872da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 219972da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 220072da7b38SWei Yongjun 220172da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2202730fc3d0SVlad Yasevich break; 220372da7b38SWei Yongjun } 220472da7b38SWei Yongjun 220572da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 220672da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 220772da7b38SWei Yongjun err_chunk); 220872da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 220972da7b38SWei Yongjun } 221072da7b38SWei Yongjun break; 2211730fc3d0SVlad Yasevich fallthrough: 22121da177e4SLinus Torvalds default: 2213bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2214bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2215bb33381dSDaniel Borkmann 22167ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22171da177e4SLinus Torvalds break; 22181da177e4SLinus Torvalds } 22191da177e4SLinus Torvalds return retval; 22201da177e4SLinus Torvalds } 22211da177e4SLinus Torvalds 22221da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2223f53b5b09SEric W. Biederman int sctp_verify_init(struct net *net, const struct sctp_association *asoc, 22241da177e4SLinus Torvalds sctp_cid_t cid, 22251da177e4SLinus Torvalds sctp_init_chunk_t *peer_init, 22261da177e4SLinus Torvalds struct sctp_chunk *chunk, 22271da177e4SLinus Torvalds struct sctp_chunk **errp) 22281da177e4SLinus Torvalds { 22291da177e4SLinus Torvalds union sctp_params param; 22307613f5feSDaniel Borkmann bool has_cookie = false; 22317ab90804SVlad Yasevich int result; 22321da177e4SLinus Torvalds 22337613f5feSDaniel Borkmann /* Check for missing mandatory parameters. Note: Initial TSN is 22347613f5feSDaniel Borkmann * also mandatory, but is not checked here since the valid range 22357613f5feSDaniel Borkmann * is 0..2**32-1. RFC4960, section 3.3.3. 22367613f5feSDaniel Borkmann */ 22377613f5feSDaniel Borkmann if (peer_init->init_hdr.num_outbound_streams == 0 || 22387613f5feSDaniel Borkmann peer_init->init_hdr.num_inbound_streams == 0 || 22397613f5feSDaniel Borkmann peer_init->init_hdr.init_tag == 0 || 22407613f5feSDaniel Borkmann ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) 22417ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22421da177e4SLinus Torvalds 22431da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22447613f5feSDaniel Borkmann if (param.p->type == SCTP_PARAM_STATE_COOKIE) 22457613f5feSDaniel Borkmann has_cookie = true; 22467613f5feSDaniel Borkmann } 22471da177e4SLinus Torvalds 22481da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22491da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22501da177e4SLinus Torvalds * The current param.p would point at the bad one. 22511da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22521da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22531da177e4SLinus Torvalds * error handling code build and send the packet. 22541da177e4SLinus Torvalds */ 22557ab90804SVlad Yasevich if (param.v != (void *)chunk->chunk_end) 22567ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22571da177e4SLinus Torvalds 22581da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22591da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22601da177e4SLinus Torvalds */ 22617ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22627ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22631da177e4SLinus Torvalds chunk, errp); 22641da177e4SLinus Torvalds 22657ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22661da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22671da177e4SLinus Torvalds 2268f53b5b09SEric W. Biederman result = sctp_verify_param(net, asoc, param, cid, chunk, errp); 22697ab90804SVlad Yasevich switch (result) { 22707ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22717ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22721da177e4SLinus Torvalds return 0; 22737ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 22741da177e4SLinus Torvalds return 1; 22757ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 22767ab90804SVlad Yasevich default: 22777ab90804SVlad Yasevich break; 22781da177e4SLinus Torvalds } 22791da177e4SLinus Torvalds 22801da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22811da177e4SLinus Torvalds 22821da177e4SLinus Torvalds return 1; 22831da177e4SLinus Torvalds } 22841da177e4SLinus Torvalds 22851da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 22861da177e4SLinus Torvalds * Returns 0 on failure, else success. 22871da177e4SLinus Torvalds * FIXME: This is an association method. 22881da177e4SLinus Torvalds */ 2289de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 22901da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2291dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 22921da177e4SLinus Torvalds { 2293e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 22941da177e4SLinus Torvalds union sctp_params param; 22951da177e4SLinus Torvalds struct sctp_transport *transport; 22961da177e4SLinus Torvalds struct list_head *pos, *temp; 2297de6becdcSWei Yongjun struct sctp_af *af; 2298de6becdcSWei Yongjun union sctp_addr addr; 22991da177e4SLinus Torvalds char *cookie; 2300de6becdcSWei Yongjun int src_match = 0; 23011da177e4SLinus Torvalds 23021da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23031da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23041da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23051da177e4SLinus Torvalds * of the INIT from the cookie. 23061da177e4SLinus Torvalds */ 23071da177e4SLinus Torvalds 23081da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23091da177e4SLinus Torvalds * added as the primary transport. The source address seems to 23101da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 23111da177e4SLinus Torvalds */ 23126a1e5f33SAl Viro if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23131da177e4SLinus Torvalds goto nomem; 2314de6becdcSWei Yongjun 2315de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2316de6becdcSWei Yongjun src_match = 1; 23171da177e4SLinus Torvalds 23181da177e4SLinus Torvalds /* Process the initialization parameters. */ 23191da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2320de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2321de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2322de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2323de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2324de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2325de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2326de6becdcSWei Yongjun src_match = 1; 2327de6becdcSWei Yongjun } 23281da177e4SLinus Torvalds 23291da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23301da177e4SLinus Torvalds goto clean_up; 23311da177e4SLinus Torvalds } 23321da177e4SLinus Torvalds 2333de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2334de6becdcSWei Yongjun if (!src_match) 2335de6becdcSWei Yongjun goto clean_up; 2336de6becdcSWei Yongjun 2337730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2338730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2339730fc3d0SVlad Yasevich */ 2340730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2341730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2342730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2343730fc3d0SVlad Yasevich 2344d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2345d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2346d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2347d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2348d6701191SVlad Yasevich * is what we'll do here. 23496b2f9cb6SVlad Yasevich */ 2350e1fc3b14SEric W. Biederman if (!net->sctp.addip_noauth && 235173d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23526b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23536b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23546b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 235588799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2356d6701191SVlad Yasevich goto clean_up; 23576b2f9cb6SVlad Yasevich } 23586b2f9cb6SVlad Yasevich 23593f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23603f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23613f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23623f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23633f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23643f7a87d2SFrank Filz } 23653f7a87d2SFrank Filz } 23663f7a87d2SFrank Filz 23671da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23681da177e4SLinus Torvalds * order. 23691da177e4SLinus Torvalds */ 23701da177e4SLinus Torvalds asoc->peer.i.init_tag = 23711da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23721da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 23731da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 23741da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 23751da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23761da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 23771da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23781da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 23791da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 23801da177e4SLinus Torvalds 23811da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 23821da177e4SLinus Torvalds * number of inbound streams. 23831da177e4SLinus Torvalds */ 23841da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 23851da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 23861da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 23871da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23881da177e4SLinus Torvalds } 23891da177e4SLinus Torvalds 23901da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 23911da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 23921da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 23931da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23941da177e4SLinus Torvalds } 23951da177e4SLinus Torvalds 23961da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 23971da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 23981da177e4SLinus Torvalds 23991da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24001da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24011da177e4SLinus Torvalds 24021da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 24031da177e4SLinus Torvalds cookie = asoc->peer.cookie; 24041da177e4SLinus Torvalds if (cookie) { 2405af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 24061da177e4SLinus Torvalds if (!asoc->peer.cookie) 24071da177e4SLinus Torvalds goto clean_up; 24081da177e4SLinus Torvalds } 24091da177e4SLinus Torvalds 24101da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24111da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24121da177e4SLinus Torvalds * advertised window). 24131da177e4SLinus Torvalds */ 24149dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24159dbc15f0SRobert P. J. Day transports) { 24161da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24171da177e4SLinus Torvalds } 24181da177e4SLinus Torvalds 24191da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24208e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24218e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24228e1ee18cSVlad Yasevich goto clean_up; 24231da177e4SLinus Torvalds 24241da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24251da177e4SLinus Torvalds * 24261da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24271da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24281da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24291da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24301da177e4SLinus Torvalds */ 24311da177e4SLinus Torvalds 24323f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 24333f7a87d2SFrank Filz * association. 24341da177e4SLinus Torvalds */ 24351da177e4SLinus Torvalds if (!asoc->temp) { 24361da177e4SLinus Torvalds int error; 24371da177e4SLinus Torvalds 24381da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 24391da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 24401da177e4SLinus Torvalds if (!asoc->ssnmap) 24411da177e4SLinus Torvalds goto clean_up; 24421da177e4SLinus Torvalds 244307d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 244407d93967SVlad Yasevich if (error) 24451da177e4SLinus Torvalds goto clean_up; 24461da177e4SLinus Torvalds } 24471da177e4SLinus Torvalds 24481da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24491da177e4SLinus Torvalds * 24501da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24511da177e4SLinus Torvalds * remote endpoint it should do the following: 24521da177e4SLinus Torvalds * ... 24531da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24541da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24551da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24561da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24571da177e4SLinus Torvalds */ 24581da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24591da177e4SLinus Torvalds return 1; 24601da177e4SLinus Torvalds 24611da177e4SLinus Torvalds clean_up: 24621da177e4SLinus Torvalds /* Release the transport structures. */ 24631da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24641da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2465add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2466add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24671da177e4SLinus Torvalds } 24683f7a87d2SFrank Filz 24691da177e4SLinus Torvalds nomem: 24701da177e4SLinus Torvalds return 0; 24711da177e4SLinus Torvalds } 24721da177e4SLinus Torvalds 24731da177e4SLinus Torvalds 24741da177e4SLinus Torvalds /* Update asoc with the option described in param. 24751da177e4SLinus Torvalds * 24761da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 24771da177e4SLinus Torvalds * 24781da177e4SLinus Torvalds * asoc is the association to update. 24791da177e4SLinus Torvalds * param is the variable length parameter to use for update. 24801da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 24811da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 24821da177e4SLinus Torvalds * work we do. In particular, we should not build transport 24831da177e4SLinus Torvalds * structures for the addresses. 24841da177e4SLinus Torvalds */ 24851da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 24861da177e4SLinus Torvalds union sctp_params param, 24871da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2488dd0fc66fSAl Viro gfp_t gfp) 24891da177e4SLinus Torvalds { 2490e7ff4a70SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 24911da177e4SLinus Torvalds union sctp_addr addr; 24921da177e4SLinus Torvalds int i; 24931da177e4SLinus Torvalds __u16 sat; 24941da177e4SLinus Torvalds int retval = 1; 24951da177e4SLinus Torvalds sctp_scope_t scope; 24961da177e4SLinus Torvalds time_t stale; 24971da177e4SLinus Torvalds struct sctp_af *af; 2498d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2499d6de3097SVlad Yasevich struct sctp_transport *t; 25001da177e4SLinus Torvalds 25011da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25021da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25031da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25041da177e4SLinus Torvalds */ 25051da177e4SLinus Torvalds switch (param.p->type) { 25061da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25071da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25081da177e4SLinus Torvalds break; 25097dab83deSVlad Yasevich goto do_addr_param; 25107dab83deSVlad Yasevich 25111da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25127dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25137dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25147dab83deSVlad Yasevich break; 25157dab83deSVlad Yasevich do_addr_param: 25161da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2517dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25181da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2519e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2520dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25211da177e4SLinus Torvalds return 0; 25221da177e4SLinus Torvalds break; 25231da177e4SLinus Torvalds 25241da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2525e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25261da177e4SLinus Torvalds break; 25271da177e4SLinus Torvalds 25281da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25291da177e4SLinus Torvalds 25301da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25311da177e4SLinus Torvalds * (1/1000sec). 25321da177e4SLinus Torvalds */ 253352db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25341da177e4SLinus Torvalds break; 25351da177e4SLinus Torvalds 25361da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2537bb33381dSDaniel Borkmann pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); 25381da177e4SLinus Torvalds break; 25391da177e4SLinus Torvalds 25401da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25411da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25421da177e4SLinus Torvalds * ones are really set by the peer. 25431da177e4SLinus Torvalds */ 25441da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25451da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25461da177e4SLinus Torvalds 2547140ee960SGui Jianfeng /* Assume that peer supports the address family 2548140ee960SGui Jianfeng * by which it sends a packet. 2549140ee960SGui Jianfeng */ 2550140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2551140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2552140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2553140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2554140ee960SGui Jianfeng 25551da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25561da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25571da177e4SLinus Torvalds if (sat) 25581da177e4SLinus Torvalds sat /= sizeof(__u16); 25591da177e4SLinus Torvalds 25601da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25611da177e4SLinus Torvalds switch (param.sat->types[i]) { 25621da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25631da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25641da177e4SLinus Torvalds break; 25651da177e4SLinus Torvalds 25661da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25676e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25681da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25691da177e4SLinus Torvalds break; 25701da177e4SLinus Torvalds 25711da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25721da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25731da177e4SLinus Torvalds break; 25741da177e4SLinus Torvalds 25751da177e4SLinus Torvalds default: /* Just ignore anything else. */ 25761da177e4SLinus Torvalds break; 25773ff50b79SStephen Hemminger } 25781da177e4SLinus Torvalds } 25791da177e4SLinus Torvalds break; 25801da177e4SLinus Torvalds 25811da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 25821da177e4SLinus Torvalds asoc->peer.cookie_len = 25831da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25841da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 25851da177e4SLinus Torvalds break; 25861da177e4SLinus Torvalds 25871da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 25881da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 25891da177e4SLinus Torvalds break; 25901da177e4SLinus Torvalds 25911da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 25921da177e4SLinus Torvalds /* Rejected during verify stage. */ 25931da177e4SLinus Torvalds break; 25941da177e4SLinus Torvalds 25951da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 25961da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 25971da177e4SLinus Torvalds break; 25981da177e4SLinus Torvalds 25990f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2600e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26011da177e4SLinus Torvalds break; 26021da177e4SLinus Torvalds 2603d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2604e1fc3b14SEric W. Biederman if (!net->sctp.addip_enable) 26050ef46e28SVlad Yasevich goto fall_through; 26060ef46e28SVlad Yasevich 2607d6de3097SVlad Yasevich addr_param = param.v + sizeof(sctp_addip_param_t); 2608d6de3097SVlad Yasevich 2609d6de3097SVlad Yasevich af = sctp_get_af_specific(param_type2af(param.p->type)); 2610d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2611d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2612d6de3097SVlad Yasevich 2613d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2614d6de3097SVlad Yasevich * XXX: see spec for what to do. 2615d6de3097SVlad Yasevich */ 2616d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2617d6de3097SVlad Yasevich break; 2618d6de3097SVlad Yasevich 2619d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2620d6de3097SVlad Yasevich if (!t) 2621d6de3097SVlad Yasevich break; 2622d6de3097SVlad Yasevich 2623d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2624d6de3097SVlad Yasevich break; 2625d6de3097SVlad Yasevich 2626131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2627131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2628131a47e3SVlad Yasevich break; 2629131a47e3SVlad Yasevich 26301da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 2631e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) { 26321da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26331da177e4SLinus Torvalds break; 26341da177e4SLinus Torvalds } 26351da177e4SLinus Torvalds /* Fall Through */ 2636730fc3d0SVlad Yasevich goto fall_through; 2637730fc3d0SVlad Yasevich 2638730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2639e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2640730fc3d0SVlad Yasevich goto fall_through; 2641730fc3d0SVlad Yasevich 2642730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2643730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2644730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2645730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2646730fc3d0SVlad Yasevich retval = 0; 2647730fc3d0SVlad Yasevich break; 2648730fc3d0SVlad Yasevich } 2649730fc3d0SVlad Yasevich break; 2650730fc3d0SVlad Yasevich 2651730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2652e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2653730fc3d0SVlad Yasevich goto fall_through; 2654730fc3d0SVlad Yasevich 2655730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2656730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2657730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2658730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2659730fc3d0SVlad Yasevich retval = 0; 2660730fc3d0SVlad Yasevich break; 2661730fc3d0SVlad Yasevich } 2662730fc3d0SVlad Yasevich 2663730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2664730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2665730fc3d0SVlad Yasevich break; 2666730fc3d0SVlad Yasevich 2667730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2668e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2669730fc3d0SVlad Yasevich goto fall_through; 2670730fc3d0SVlad Yasevich 2671730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2672730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2673730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2674730fc3d0SVlad Yasevich retval = 0; 2675730fc3d0SVlad Yasevich break; 2676730fc3d0SVlad Yasevich fall_through: 26771da177e4SLinus Torvalds default: 26781da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 26791da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 26801da177e4SLinus Torvalds * called prior to this routine. Simply log the error 26811da177e4SLinus Torvalds * here. 26821da177e4SLinus Torvalds */ 2683bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2684bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 26851da177e4SLinus Torvalds break; 26863ff50b79SStephen Hemminger } 26871da177e4SLinus Torvalds 26881da177e4SLinus Torvalds return retval; 26891da177e4SLinus Torvalds } 26901da177e4SLinus Torvalds 26911da177e4SLinus Torvalds /* Select a new verification tag. */ 26921da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 26931da177e4SLinus Torvalds { 26941da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 26951da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 26961da177e4SLinus Torvalds */ 26971da177e4SLinus Torvalds __u32 x; 26981da177e4SLinus Torvalds 26991da177e4SLinus Torvalds do { 27001da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27011da177e4SLinus Torvalds } while (x == 0); 27021da177e4SLinus Torvalds 27031da177e4SLinus Torvalds return x; 27041da177e4SLinus Torvalds } 27051da177e4SLinus Torvalds 27061da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27071da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27081da177e4SLinus Torvalds { 27091da177e4SLinus Torvalds __u32 retval; 27101da177e4SLinus Torvalds 27111da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27121da177e4SLinus Torvalds return retval; 27131da177e4SLinus Torvalds } 27141da177e4SLinus Torvalds 27151da177e4SLinus Torvalds /* 27161da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27171da177e4SLinus Torvalds * 0 1 2 3 27181da177e4SLinus 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 27191da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27201da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27211da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27221da177e4SLinus Torvalds * | Serial Number | 27231da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27241da177e4SLinus Torvalds * | Address Parameter | 27251da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27261da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27271da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27281da177e4SLinus Torvalds * \ \ 27291da177e4SLinus Torvalds * / .... / 27301da177e4SLinus Torvalds * \ \ 27311da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27321da177e4SLinus Torvalds * | ASCONF Parameter #N | 27331da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27341da177e4SLinus Torvalds * 27351da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27361da177e4SLinus Torvalds */ 27371da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27381da177e4SLinus Torvalds union sctp_addr *addr, 27391da177e4SLinus Torvalds int vparam_len) 27401da177e4SLinus Torvalds { 27411da177e4SLinus Torvalds sctp_addiphdr_t asconf; 27421da177e4SLinus Torvalds struct sctp_chunk *retval; 27431da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27441da177e4SLinus Torvalds union sctp_addr_param addrparam; 27451da177e4SLinus Torvalds int addrlen; 27461da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27471da177e4SLinus Torvalds 27481da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27491da177e4SLinus Torvalds if (!addrlen) 27501da177e4SLinus Torvalds return NULL; 27511da177e4SLinus Torvalds length += addrlen; 27521da177e4SLinus Torvalds 27531da177e4SLinus Torvalds /* Create the chunk. */ 2754072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length); 27551da177e4SLinus Torvalds if (!retval) 27561da177e4SLinus Torvalds return NULL; 27571da177e4SLinus Torvalds 27581da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27591da177e4SLinus Torvalds 27601da177e4SLinus Torvalds retval->subh.addip_hdr = 27611da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27621da177e4SLinus Torvalds retval->param_hdr.v = 27631da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27641da177e4SLinus Torvalds 27651da177e4SLinus Torvalds return retval; 27661da177e4SLinus Torvalds } 27671da177e4SLinus Torvalds 27681da177e4SLinus Torvalds /* ADDIP 27691da177e4SLinus Torvalds * 3.2.1 Add IP Address 27701da177e4SLinus Torvalds * 0 1 2 3 27711da177e4SLinus 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 27721da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27731da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 27741da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27751da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27761da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27771da177e4SLinus Torvalds * | Address Parameter | 27781da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27791da177e4SLinus Torvalds * 27801da177e4SLinus Torvalds * 3.2.2 Delete IP Address 27811da177e4SLinus Torvalds * 0 1 2 3 27821da177e4SLinus 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 27831da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27841da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 27851da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27861da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27881da177e4SLinus Torvalds * | Address Parameter | 27891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27901da177e4SLinus Torvalds * 27911da177e4SLinus Torvalds */ 27921da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 27931da177e4SLinus Torvalds union sctp_addr *laddr, 27941da177e4SLinus Torvalds struct sockaddr *addrs, 27951da177e4SLinus Torvalds int addrcnt, 2796dbc16db1SAl Viro __be16 flags) 27971da177e4SLinus Torvalds { 27981da177e4SLinus Torvalds sctp_addip_param_t param; 27991da177e4SLinus Torvalds struct sctp_chunk *retval; 28001da177e4SLinus Torvalds union sctp_addr_param addr_param; 28011da177e4SLinus Torvalds union sctp_addr *addr; 28021da177e4SLinus Torvalds void *addr_buf; 28031da177e4SLinus Torvalds struct sctp_af *af; 28041da177e4SLinus Torvalds int paramlen = sizeof(param); 28051da177e4SLinus Torvalds int addr_param_len = 0; 28061da177e4SLinus Torvalds int totallen = 0; 28071da177e4SLinus Torvalds int i; 28088a07eb0aSMichio Honda int del_pickup = 0; 28091da177e4SLinus Torvalds 28101da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28111da177e4SLinus Torvalds addr_buf = addrs; 28121da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2813ea110733SJoe Perches addr = addr_buf; 28141da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28151da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28161da177e4SLinus Torvalds 28171da177e4SLinus Torvalds totallen += paramlen; 28181da177e4SLinus Torvalds totallen += addr_param_len; 28191da177e4SLinus Torvalds 28201da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28218a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28228a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28238a07eb0aSMichio Honda totallen += paramlen; 28248a07eb0aSMichio Honda totallen += addr_param_len; 28258a07eb0aSMichio Honda del_pickup = 1; 2826bb33381dSDaniel Borkmann 2827bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2828bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2829bb33381dSDaniel Borkmann __func__, totallen); 28308a07eb0aSMichio Honda } 28311da177e4SLinus Torvalds } 28321da177e4SLinus Torvalds 28331da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28341da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28351da177e4SLinus Torvalds if (!retval) 28361da177e4SLinus Torvalds return NULL; 28371da177e4SLinus Torvalds 28381da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28391da177e4SLinus Torvalds addr_buf = addrs; 28401da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2841ea110733SJoe Perches addr = addr_buf; 28421da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28431da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28441da177e4SLinus Torvalds param.param_hdr.type = flags; 28451da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 28461da177e4SLinus Torvalds param.crr_id = i; 28471da177e4SLinus Torvalds 28481da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28491da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28501da177e4SLinus Torvalds 28511da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28521da177e4SLinus Torvalds } 28538a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28548a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28558a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28568a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28578a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28588a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 28598a07eb0aSMichio Honda param.crr_id = i; 28608a07eb0aSMichio Honda 28618a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28628a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28638a07eb0aSMichio Honda } 28641da177e4SLinus Torvalds return retval; 28651da177e4SLinus Torvalds } 28661da177e4SLinus Torvalds 28671da177e4SLinus Torvalds /* ADDIP 28681da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 28691da177e4SLinus Torvalds * 0 1 2 3 28701da177e4SLinus 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 28711da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28721da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 28731da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28741da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28751da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28761da177e4SLinus Torvalds * | Address Parameter | 28771da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28781da177e4SLinus Torvalds * 28791da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 28801da177e4SLinus Torvalds */ 28811da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 28821da177e4SLinus Torvalds union sctp_addr *addr) 28831da177e4SLinus Torvalds { 28841da177e4SLinus Torvalds sctp_addip_param_t param; 28851da177e4SLinus Torvalds struct sctp_chunk *retval; 28861da177e4SLinus Torvalds int len = sizeof(param); 28871da177e4SLinus Torvalds union sctp_addr_param addrparam; 28881da177e4SLinus Torvalds int addrlen; 28891da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 28901da177e4SLinus Torvalds 28911da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 28921da177e4SLinus Torvalds if (!addrlen) 28931da177e4SLinus Torvalds return NULL; 28941da177e4SLinus Torvalds len += addrlen; 28951da177e4SLinus Torvalds 28961da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 28971da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 28981da177e4SLinus Torvalds if (!retval) 28991da177e4SLinus Torvalds return NULL; 29001da177e4SLinus Torvalds 29011da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29021da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29031da177e4SLinus Torvalds param.crr_id = 0; 29041da177e4SLinus Torvalds 29051da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29061da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29071da177e4SLinus Torvalds 29081da177e4SLinus Torvalds return retval; 29091da177e4SLinus Torvalds } 29101da177e4SLinus Torvalds 29111da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29121da177e4SLinus Torvalds * 0 1 2 3 29131da177e4SLinus 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 29141da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29151da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29161da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29171da177e4SLinus Torvalds * | Serial Number | 29181da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29191da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29201da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29211da177e4SLinus Torvalds * \ \ 29221da177e4SLinus Torvalds * / .... / 29231da177e4SLinus Torvalds * \ \ 29241da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29251da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29261da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29271da177e4SLinus Torvalds * 29281da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29291da177e4SLinus Torvalds */ 29301da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29311da177e4SLinus Torvalds __u32 serial, int vparam_len) 29321da177e4SLinus Torvalds { 29331da177e4SLinus Torvalds sctp_addiphdr_t asconf; 29341da177e4SLinus Torvalds struct sctp_chunk *retval; 29351da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29361da177e4SLinus Torvalds 29371da177e4SLinus Torvalds /* Create the chunk. */ 2938072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length); 29391da177e4SLinus Torvalds if (!retval) 29401da177e4SLinus Torvalds return NULL; 29411da177e4SLinus Torvalds 29421da177e4SLinus Torvalds asconf.serial = htonl(serial); 29431da177e4SLinus Torvalds 29441da177e4SLinus Torvalds retval->subh.addip_hdr = 29451da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29461da177e4SLinus Torvalds 29471da177e4SLinus Torvalds return retval; 29481da177e4SLinus Torvalds } 29491da177e4SLinus Torvalds 29501da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29519f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2952dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 29531da177e4SLinus Torvalds { 29541da177e4SLinus Torvalds sctp_addip_param_t ack_param; 29551da177e4SLinus Torvalds sctp_errhdr_t err_param; 29561da177e4SLinus Torvalds int asconf_param_len = 0; 29571da177e4SLinus Torvalds int err_param_len = 0; 2958dbc16db1SAl Viro __be16 response_type; 29591da177e4SLinus Torvalds 29601da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 29611da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 29621da177e4SLinus Torvalds } else { 29631da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 29641da177e4SLinus Torvalds err_param_len = sizeof(err_param); 29651da177e4SLinus Torvalds if (asconf_param) 29661da177e4SLinus Torvalds asconf_param_len = 29671da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 29681da177e4SLinus Torvalds } 29691da177e4SLinus Torvalds 29701da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 29711da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 29721da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 29731da177e4SLinus Torvalds err_param_len + 29741da177e4SLinus Torvalds asconf_param_len); 29751da177e4SLinus Torvalds ack_param.crr_id = crr_id; 29761da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 29771da177e4SLinus Torvalds 29781da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 29791da177e4SLinus Torvalds return; 29801da177e4SLinus Torvalds 29811da177e4SLinus Torvalds /* Add Error Cause parameter. */ 29821da177e4SLinus Torvalds err_param.cause = err_code; 29831da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 29841da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 29851da177e4SLinus Torvalds 29861da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 29871da177e4SLinus Torvalds if (asconf_param) 29881da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 29891da177e4SLinus Torvalds } 29901da177e4SLinus Torvalds 29911da177e4SLinus Torvalds /* Process a asconf parameter. */ 2992dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 29931da177e4SLinus Torvalds struct sctp_chunk *asconf, 29941da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 29951da177e4SLinus Torvalds { 29961da177e4SLinus Torvalds struct sctp_transport *peer; 29971da177e4SLinus Torvalds struct sctp_af *af; 29981da177e4SLinus Torvalds union sctp_addr addr; 29991da177e4SLinus Torvalds union sctp_addr_param *addr_param; 30001da177e4SLinus Torvalds 3001ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 3002c1cc678aSPatrick McHardy 300344e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 300444e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 300544e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 300644e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 300744e65c1eSWei Yongjun 30086a435732SShan Wei switch (addr_param->p.type) { 3009c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 3010c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 3011945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3012c4492586SWei Yongjun break; 3013c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 3014c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 3015945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3016c4492586SWei Yongjun break; 3017c4492586SWei Yongjun default: 3018945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3019c4492586SWei Yongjun } 3020c4492586SWei Yongjun 30216a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30221da177e4SLinus Torvalds if (unlikely(!af)) 3023945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30241da177e4SLinus Torvalds 3025dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 302642e30bf3SVlad Yasevich 302742e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 302842e30bf3SVlad Yasevich * or multicast address. 302942e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 303042e30bf3SVlad Yasevich * make sure we check for that) 303142e30bf3SVlad Yasevich */ 303242e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3033945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 303442e30bf3SVlad Yasevich 30351da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30361da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 303742e30bf3SVlad Yasevich /* Section 4.2.1: 303842e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 303942e30bf3SVlad Yasevich * address of the packet MUST be added. 304042e30bf3SVlad Yasevich */ 304142e30bf3SVlad Yasevich if (af->is_any(&addr)) 304242e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 304342e30bf3SVlad Yasevich 30441da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30451da177e4SLinus Torvalds * request and does not have the local resources to add this 30461da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30471da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30481da177e4SLinus Torvalds * Due to Resource Shortage'. 30491da177e4SLinus Torvalds */ 30501da177e4SLinus Torvalds 3051dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30521da177e4SLinus Torvalds if (!peer) 30531da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30541da177e4SLinus Torvalds 30551da177e4SLinus Torvalds /* Start the heartbeat timer. */ 30561da177e4SLinus Torvalds if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) 30571da177e4SLinus Torvalds sctp_transport_hold(peer); 30586af29cccSMichio Honda asoc->new_transport = peer; 30591da177e4SLinus Torvalds break; 30601da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30611da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30621da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30631da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30641da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 30651da177e4SLinus Torvalds */ 306642e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 30671da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 30681da177e4SLinus Torvalds 30691da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 30701da177e4SLinus Torvalds * address which is also the source address of the IP packet 30711da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 30721da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 30731da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 30741da177e4SLinus Torvalds * Delete Source IP Address' 30751da177e4SLinus Torvalds */ 3076b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 30771da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 30781da177e4SLinus Torvalds 307942e30bf3SVlad Yasevich /* Section 4.2.2 308042e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 308142e30bf3SVlad Yasevich * addresses of the peer except the source address of the 308242e30bf3SVlad Yasevich * packet MUST be deleted. 308342e30bf3SVlad Yasevich */ 308442e30bf3SVlad Yasevich if (af->is_any(&addr)) { 308542e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 308642e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 308742e30bf3SVlad Yasevich asconf->transport); 308842e30bf3SVlad Yasevich } else 3089dd86d136SAl Viro sctp_assoc_del_peer(asoc, &addr); 30901da177e4SLinus Torvalds break; 30911da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 309242e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 309342e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 309442e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 309542e30bf3SVlad Yasevich * primary. 309642e30bf3SVlad Yasevich */ 309742e30bf3SVlad Yasevich if (af->is_any(&addr)) 309842e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 309942e30bf3SVlad Yasevich 3100dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31011da177e4SLinus Torvalds if (!peer) 3102945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31031da177e4SLinus Torvalds 31041da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31051da177e4SLinus Torvalds break; 31061da177e4SLinus Torvalds } 31071da177e4SLinus Torvalds 31081da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31091da177e4SLinus Torvalds } 31101da177e4SLinus Torvalds 31116f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31126f4c618dSWei Yongjun int sctp_verify_asconf(const struct sctp_association *asoc, 31136f4c618dSWei Yongjun struct sctp_paramhdr *param_hdr, void *chunk_end, 31146f4c618dSWei Yongjun struct sctp_paramhdr **errp) { 31156f4c618dSWei Yongjun sctp_addip_param_t *asconf_param; 31166f4c618dSWei Yongjun union sctp_params param; 31176f4c618dSWei Yongjun int length, plen; 31186f4c618dSWei Yongjun 31196f4c618dSWei Yongjun param.v = (sctp_paramhdr_t *) param_hdr; 31206f4c618dSWei Yongjun while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) { 31216f4c618dSWei Yongjun length = ntohs(param.p->length); 31226f4c618dSWei Yongjun *errp = param.p; 31236f4c618dSWei Yongjun 31246f4c618dSWei Yongjun if (param.v > chunk_end - length || 31256f4c618dSWei Yongjun length < sizeof(sctp_paramhdr_t)) 31266f4c618dSWei Yongjun return 0; 31276f4c618dSWei Yongjun 31286f4c618dSWei Yongjun switch (param.p->type) { 31296f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31306f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31316f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31326f4c618dSWei Yongjun asconf_param = (sctp_addip_param_t *)param.v; 31336f4c618dSWei Yongjun plen = ntohs(asconf_param->param_hdr.length); 31346f4c618dSWei Yongjun if (plen < sizeof(sctp_addip_param_t) + 31356f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 31366f4c618dSWei Yongjun return 0; 31376f4c618dSWei Yongjun break; 31386f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 31396f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 31406f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 31416f4c618dSWei Yongjun return 0; 31426f4c618dSWei Yongjun 31436f4c618dSWei Yongjun break; 31446f4c618dSWei Yongjun default: 31456f4c618dSWei Yongjun break; 31466f4c618dSWei Yongjun } 31476f4c618dSWei Yongjun 31486f4c618dSWei Yongjun param.v += WORD_ROUND(length); 31496f4c618dSWei Yongjun } 31506f4c618dSWei Yongjun 31516f4c618dSWei Yongjun if (param.v != chunk_end) 31526f4c618dSWei Yongjun return 0; 31536f4c618dSWei Yongjun 31546f4c618dSWei Yongjun return 1; 31556f4c618dSWei Yongjun } 31566f4c618dSWei Yongjun 31571da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 31581da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 31591da177e4SLinus Torvalds */ 31601da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 31611da177e4SLinus Torvalds struct sctp_chunk *asconf) 31621da177e4SLinus Torvalds { 31631da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 31641da177e4SLinus Torvalds union sctp_addr_param *addr_param; 31651da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 31661da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 31671da177e4SLinus Torvalds 3168dbc16db1SAl Viro __be16 err_code; 31691da177e4SLinus Torvalds int length = 0; 3170f3830cccSWei Yongjun int chunk_len; 31711da177e4SLinus Torvalds __u32 serial; 31721da177e4SLinus Torvalds int all_param_pass = 1; 31731da177e4SLinus Torvalds 3174f3830cccSWei Yongjun chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); 31751da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 31761da177e4SLinus Torvalds serial = ntohl(hdr->serial); 31771da177e4SLinus Torvalds 31781da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 31791da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 31801da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 31811da177e4SLinus Torvalds chunk_len -= length; 31821da177e4SLinus Torvalds 31831da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 31847aa1b54bSJoe Perches * asconf parameter. 31851da177e4SLinus Torvalds */ 31866a435732SShan Wei length = ntohs(addr_param->p.length); 3187ea110733SJoe Perches asconf_param = (void *)addr_param + length; 31881da177e4SLinus Torvalds chunk_len -= length; 31891da177e4SLinus Torvalds 31901da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 31911da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 31922cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 31937aa1b54bSJoe Perches * parameters. 31941da177e4SLinus Torvalds */ 31952cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 31961da177e4SLinus Torvalds if (!asconf_ack) 31971da177e4SLinus Torvalds goto done; 31981da177e4SLinus Torvalds 31991da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 32001da177e4SLinus Torvalds while (chunk_len > 0) { 32011da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 32021da177e4SLinus Torvalds asconf_param); 32031da177e4SLinus Torvalds /* ADDIP 4.1 A7) 32041da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 32051da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 32061da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 32071da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 32081da177e4SLinus Torvalds * a specific success indication is present for the parameter. 32091da177e4SLinus Torvalds */ 32101da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR != err_code) 32111da177e4SLinus Torvalds all_param_pass = 0; 32121da177e4SLinus Torvalds 32131da177e4SLinus Torvalds if (!all_param_pass) 32141da177e4SLinus Torvalds sctp_add_asconf_response(asconf_ack, 32151da177e4SLinus Torvalds asconf_param->crr_id, err_code, 32161da177e4SLinus Torvalds asconf_param); 32171da177e4SLinus Torvalds 32181da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32191da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32201da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32211da177e4SLinus Torvalds * in the ASCONF. 32221da177e4SLinus Torvalds */ 32231da177e4SLinus Torvalds if (SCTP_ERROR_RSRC_LOW == err_code) 32241da177e4SLinus Torvalds goto done; 32251da177e4SLinus Torvalds 32261da177e4SLinus Torvalds /* Move to the next ASCONF param. */ 32271da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3228ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 32291da177e4SLinus Torvalds chunk_len -= length; 32301da177e4SLinus Torvalds } 32311da177e4SLinus Torvalds 32321da177e4SLinus Torvalds done: 32331da177e4SLinus Torvalds asoc->peer.addip_serial++; 32341da177e4SLinus Torvalds 32351da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 32361da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 32371da177e4SLinus Torvalds */ 32381da177e4SLinus Torvalds if (asconf_ack) { 32391da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3240a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3241a08de64dSVlad Yasevich &asoc->asconf_ack_list); 32421da177e4SLinus Torvalds } 32431da177e4SLinus Torvalds 32441da177e4SLinus Torvalds return asconf_ack; 32451da177e4SLinus Torvalds } 32461da177e4SLinus Torvalds 32471da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3248425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 32491da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 32501da177e4SLinus Torvalds { 32511da177e4SLinus Torvalds struct sctp_af *af; 32521da177e4SLinus Torvalds union sctp_addr addr; 32531da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 32541da177e4SLinus Torvalds union sctp_addr_param *addr_param; 32551da177e4SLinus Torvalds struct sctp_transport *transport; 3256dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 32571da177e4SLinus Torvalds 3258ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 32591da177e4SLinus Torvalds 32601da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 32616a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3262dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 32631da177e4SLinus Torvalds 32641da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 32651da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3266559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3267559cf710SVlad Yasevich * held, so the list can not change. 3268559cf710SVlad Yasevich */ 32690ed90fb0SVlad Yasevich local_bh_disable(); 3270559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3271dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3272f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3273dc022a98SSridhar Samudrala } 32740ed90fb0SVlad Yasevich local_bh_enable(); 32753cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 32763cd9749cSWei Yongjun transports) { 32773cd9749cSWei Yongjun dst_release(transport->dst); 3278c6ef006bSVlad Yasevich transport->dst = NULL; 32793cd9749cSWei Yongjun } 32801da177e4SLinus Torvalds break; 32811da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 32820ed90fb0SVlad Yasevich local_bh_disable(); 3283425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 32848a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 32858a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 32868a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 32878a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 32888a07eb0aSMichio Honda } 32890ed90fb0SVlad Yasevich local_bh_enable(); 32909dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 32919dbc15f0SRobert P. J. Day transports) { 3292dc022a98SSridhar Samudrala dst_release(transport->dst); 3293c6ef006bSVlad Yasevich transport->dst = NULL; 32941da177e4SLinus Torvalds } 32951da177e4SLinus Torvalds break; 32961da177e4SLinus Torvalds default: 32971da177e4SLinus Torvalds break; 32981da177e4SLinus Torvalds } 32991da177e4SLinus Torvalds } 33001da177e4SLinus Torvalds 33011da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 33021da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 33031da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 33041da177e4SLinus Torvalds * ADDIP 4.1 33051da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 33061da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 33071da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 33081da177e4SLinus Torvalds * specific success indication is present for the parameter. 33091da177e4SLinus Torvalds */ 3310dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 33111da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 33121da177e4SLinus Torvalds int no_err) 33131da177e4SLinus Torvalds { 33141da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 33151da177e4SLinus Torvalds sctp_errhdr_t *err_param; 33161da177e4SLinus Torvalds int length; 3317f3830cccSWei Yongjun int asconf_ack_len; 3318dbc16db1SAl Viro __be16 err_code; 33191da177e4SLinus Torvalds 33201da177e4SLinus Torvalds if (no_err) 33211da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33221da177e4SLinus Torvalds else 33231da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33241da177e4SLinus Torvalds 3325f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3326f3830cccSWei Yongjun sizeof(sctp_chunkhdr_t); 3327f3830cccSWei Yongjun 33281da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33291da177e4SLinus Torvalds * the first asconf_ack parameter. 33301da177e4SLinus Torvalds */ 33311da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 33321da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 33331da177e4SLinus Torvalds length); 33341da177e4SLinus Torvalds asconf_ack_len -= length; 33351da177e4SLinus Torvalds 33361da177e4SLinus Torvalds while (asconf_ack_len > 0) { 33371da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 33381da177e4SLinus Torvalds switch (asconf_ack_param->param_hdr.type) { 33391da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 33401da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 33411da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 33421da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 3343ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 33441da177e4SLinus Torvalds asconf_ack_len -= length; 33451da177e4SLinus Torvalds if (asconf_ack_len > 0) 33461da177e4SLinus Torvalds return err_param->cause; 33471da177e4SLinus Torvalds else 33481da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33491da177e4SLinus Torvalds break; 33501da177e4SLinus Torvalds default: 33511da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33521da177e4SLinus Torvalds } 33531da177e4SLinus Torvalds } 33541da177e4SLinus Torvalds 33551da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3356ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 33571da177e4SLinus Torvalds asconf_ack_len -= length; 33581da177e4SLinus Torvalds } 33591da177e4SLinus Torvalds 33601da177e4SLinus Torvalds return err_code; 33611da177e4SLinus Torvalds } 33621da177e4SLinus Torvalds 33631da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 33641da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 33651da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 33661da177e4SLinus Torvalds { 33671da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 33681da177e4SLinus Torvalds union sctp_addr_param *addr_param; 33691da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 33701da177e4SLinus Torvalds int length = 0; 33711da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 33721da177e4SLinus Torvalds int all_param_pass = 0; 33731da177e4SLinus Torvalds int no_err = 1; 33741da177e4SLinus Torvalds int retval = 0; 3375dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 33761da177e4SLinus Torvalds 33771da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 33781da177e4SLinus Torvalds * a pointer to address parameter. 33791da177e4SLinus Torvalds */ 33801da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 33811da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 33821da177e4SLinus Torvalds asconf_len -= length; 33831da177e4SLinus Torvalds 33841da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 33857aa1b54bSJoe Perches * pointer to the first asconf parameter. 33861da177e4SLinus Torvalds */ 33876a435732SShan Wei length = ntohs(addr_param->p.length); 3388ea110733SJoe Perches asconf_param = (void *)addr_param + length; 33891da177e4SLinus Torvalds asconf_len -= length; 33901da177e4SLinus Torvalds 33911da177e4SLinus Torvalds /* ADDIP 4.1 33921da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 33931da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 33941da177e4SLinus Torvalds * successful. 33951da177e4SLinus Torvalds */ 33961da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 33971da177e4SLinus Torvalds all_param_pass = 1; 33981da177e4SLinus Torvalds 33991da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 34001da177e4SLinus Torvalds while (asconf_len > 0) { 34011da177e4SLinus Torvalds if (all_param_pass) 34021da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34031da177e4SLinus Torvalds else { 34041da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 34051da177e4SLinus Torvalds asconf_param, 34061da177e4SLinus Torvalds no_err); 34071da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 34081da177e4SLinus Torvalds no_err = 0; 34091da177e4SLinus Torvalds } 34101da177e4SLinus Torvalds 34111da177e4SLinus Torvalds switch (err_code) { 34121da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3413425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 34141da177e4SLinus Torvalds break; 34151da177e4SLinus Torvalds 34161da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 34171da177e4SLinus Torvalds retval = 1; 34181da177e4SLinus Torvalds break; 34191da177e4SLinus Torvalds 3420a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34211da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34221da177e4SLinus Torvalds * future. 34231da177e4SLinus Torvalds */ 34241da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34251da177e4SLinus Torvalds asconf_param->param_hdr.type; 34261da177e4SLinus Torvalds break; 34271da177e4SLinus Torvalds 34281da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34291da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34301da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34311da177e4SLinus Torvalds default: 34321da177e4SLinus Torvalds break; 34331da177e4SLinus Torvalds } 34341da177e4SLinus Torvalds 34351da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 34361da177e4SLinus Torvalds * one. 34371da177e4SLinus Torvalds */ 34381da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3439ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 34401da177e4SLinus Torvalds asconf_len -= length; 34411da177e4SLinus Torvalds } 34421da177e4SLinus Torvalds 3443ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 34448a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3445ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3446ddc4bbeeSMichio Honda } 34478a07eb0aSMichio Honda 34481da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 34495f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 34501da177e4SLinus Torvalds sctp_chunk_free(asconf); 34511da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 34521da177e4SLinus Torvalds 34531da177e4SLinus Torvalds return retval; 34541da177e4SLinus Torvalds } 34551da177e4SLinus Torvalds 34561da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 34571da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 34581da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 34591da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 34601da177e4SLinus Torvalds { 34611da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 34621da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 34631da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 34641da177e4SLinus Torvalds size_t hint; 34651da177e4SLinus Torvalds int i; 34661da177e4SLinus Torvalds 34671da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 34681da177e4SLinus Torvalds 3469072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint); 34701da177e4SLinus Torvalds 34711da177e4SLinus Torvalds if (!retval) 34721da177e4SLinus Torvalds return NULL; 34731da177e4SLinus Torvalds 34741da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 34751da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 34761da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 34771da177e4SLinus Torvalds 34781da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 34791da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 34801da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 34811da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 34821da177e4SLinus Torvalds } 34831da177e4SLinus Torvalds 34841da177e4SLinus Torvalds return retval; 34851da177e4SLinus Torvalds } 3486