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 261da177e4SLinus Torvalds * along with GNU CC; see the file COPYING. If not, write to 271da177e4SLinus Torvalds * the Free Software Foundation, 59 Temple Place - Suite 330, 281da177e4SLinus Torvalds * Boston, MA 02111-1307, USA. 291da177e4SLinus Torvalds * 301da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 311da177e4SLinus Torvalds * email address(es): 321da177e4SLinus Torvalds * lksctp developers <lksctp-developers@lists.sourceforge.net> 331da177e4SLinus Torvalds * 341da177e4SLinus Torvalds * Or submit a bug report through the following website: 351da177e4SLinus Torvalds * http://www.sf.net/projects/lksctp 361da177e4SLinus Torvalds * 371da177e4SLinus Torvalds * Written or modified by: 381da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 391da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 401da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 411da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 421da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 431da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 441da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 451da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 461da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 471da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 481da177e4SLinus Torvalds * 491da177e4SLinus Torvalds * Any bugs reported given to us we will try to fix... any fixes shared will 501da177e4SLinus Torvalds * be incorporated into the next SCTP release. 511da177e4SLinus Torvalds */ 521da177e4SLinus Torvalds 53145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 54145ce502SJoe Perches 551da177e4SLinus Torvalds #include <linux/types.h> 561da177e4SLinus Torvalds #include <linux/kernel.h> 571da177e4SLinus Torvalds #include <linux/ip.h> 581da177e4SLinus Torvalds #include <linux/ipv6.h> 591da177e4SLinus Torvalds #include <linux/net.h> 601da177e4SLinus Torvalds #include <linux/inet.h> 61ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 621da177e4SLinus Torvalds #include <linux/crypto.h> 635a0e3ad6STejun Heo #include <linux/slab.h> 641da177e4SLinus Torvalds #include <net/sock.h> 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds #include <linux/skbuff.h> 671da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 681da177e4SLinus Torvalds #include <net/sctp/sctp.h> 691da177e4SLinus Torvalds #include <net/sctp/sm.h> 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds SCTP_STATIC 721da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 731da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen); 741da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 751da177e4SLinus Torvalds const struct sctp_association *asoc, 761da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 771da177e4SLinus Torvalds int *cookie_len, 781da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 791da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 801da177e4SLinus Torvalds union sctp_params param, 811da177e4SLinus Torvalds const union sctp_addr *peer_addr, 82dd0fc66fSAl Viro gfp_t gfp); 838ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 848ee4be37SVlad Yasevich const void *data); 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 871da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 881da177e4SLinus Torvalds { 891da177e4SLinus Torvalds struct sctp_af *af; 901da177e4SLinus Torvalds int iif = 0; 911da177e4SLinus Torvalds 92eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version)); 931da177e4SLinus Torvalds if (af) 941da177e4SLinus Torvalds iif = af->skb_iif(chunk->skb); 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds return iif; 971da177e4SLinus Torvalds } 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1001da177e4SLinus Torvalds * 1011da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1021da177e4SLinus Torvalds * Explicit Congestion Notification. 1031da177e4SLinus Torvalds */ 1041da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1051da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 10609640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1071da177e4SLinus Torvalds }; 1081da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1091da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 11009640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1111da177e4SLinus Torvalds }; 1121da177e4SLinus Torvalds 1135fa782c2SNeil Horman /* A helper to initialize an op error inside a 1141da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1151da177e4SLinus Torvalds * abort chunk. 1161da177e4SLinus Torvalds */ 1175bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 11800f1c2dfSWei Yongjun size_t paylen) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds sctp_errhdr_t err; 1211da177e4SLinus Torvalds __u16 len; 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1241da177e4SLinus Torvalds err.cause = cause_code; 1251da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1261da177e4SLinus Torvalds err.length = htons(len); 1274a1c0107SVlad Yasevich chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 1305fa782c2SNeil Horman /* A helper to initialize an op error inside a 1315fa782c2SNeil Horman * provided chunk, as most cause codes will be embedded inside an 1325fa782c2SNeil Horman * abort chunk. Differs from sctp_init_cause in that it won't oops 1335fa782c2SNeil Horman * if there isn't enough space in the op error chunk 1345fa782c2SNeil Horman */ 135db28aafaSIoan Orghici static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, 1365fa782c2SNeil Horman size_t paylen) 1375fa782c2SNeil Horman { 1385fa782c2SNeil Horman sctp_errhdr_t err; 1395fa782c2SNeil Horman __u16 len; 1405fa782c2SNeil Horman 1415fa782c2SNeil Horman /* Cause code constants are now defined in network order. */ 1425fa782c2SNeil Horman err.cause = cause_code; 1435fa782c2SNeil Horman len = sizeof(sctp_errhdr_t) + paylen; 1445fa782c2SNeil Horman err.length = htons(len); 1455fa782c2SNeil Horman 1462e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) < len) 1475fa782c2SNeil Horman return -ENOSPC; 1485fa782c2SNeil Horman chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, 1495fa782c2SNeil Horman sizeof(sctp_errhdr_t), 1505fa782c2SNeil Horman &err); 1515fa782c2SNeil Horman return 0; 1525fa782c2SNeil Horman } 1531da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1541da177e4SLinus Torvalds * 1551da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1561da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1571da177e4SLinus Torvalds * 1581da177e4SLinus Torvalds * 0 1 2 3 1591da177e4SLinus 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 1601da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1611da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1621da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1631da177e4SLinus Torvalds * | Initiate Tag | 1641da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1651da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1661da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1671da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1681da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1691da177e4SLinus Torvalds * | Initial TSN | 1701da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1711da177e4SLinus Torvalds * \ \ 1721da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1731da177e4SLinus Torvalds * \ \ 1741da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1751da177e4SLinus Torvalds * 1761da177e4SLinus Torvalds * 1771da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1781da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1791da177e4SLinus Torvalds * 1801da177e4SLinus Torvalds * Fixed Parameters Status 1811da177e4SLinus Torvalds * ---------------------------------------------- 1821da177e4SLinus Torvalds * Initiate Tag Mandatory 1831da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 1841da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 1851da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 1861da177e4SLinus Torvalds * Initial TSN Mandatory 1871da177e4SLinus Torvalds * 1881da177e4SLinus Torvalds * Variable Parameters Status Type Value 1891da177e4SLinus Torvalds * ------------------------------------------------------------- 1901da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 1911da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 1921da177e4SLinus Torvalds * Cookie Preservative Optional 9 1931da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 1941da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 1951da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 1961da177e4SLinus Torvalds */ 1971da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 1981da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 199dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2001da177e4SLinus Torvalds { 2011da177e4SLinus Torvalds sctp_inithdr_t init; 2021da177e4SLinus Torvalds union sctp_params addrs; 2031da177e4SLinus Torvalds size_t chunksize; 2041da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2051da177e4SLinus Torvalds int num_types, addrs_len = 0; 2061da177e4SLinus Torvalds struct sctp_sock *sp; 2071da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 2083dbe8656SAl Viro __be16 types[2]; 2090f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 210131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 211131a47e3SVlad Yasevich int num_ext = 0; 212131a47e3SVlad Yasevich __u8 extensions[3]; 213730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 214730fc3d0SVlad Yasevich *auth_hmacs = NULL; 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2171da177e4SLinus Torvalds * 2181da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2191da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2201da177e4SLinus Torvalds */ 2211da177e4SLinus Torvalds retval = NULL; 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2241da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2271da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2281da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2291da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2301da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds /* How many address types are needed? */ 2331da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2341da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2351da177e4SLinus Torvalds 236a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 237a8170c35SWei Yongjun chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types)); 2381da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2398ee4be37SVlad Yasevich 240036b579bSVlad Yasevich if (sctp_prsctp_enable) 241036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 242036b579bSVlad Yasevich 243131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 244131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 245131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 246131a47e3SVlad Yasevich * INIT-ACK parameters. 247131a47e3SVlad Yasevich */ 248131a47e3SVlad Yasevich if (sctp_addip_enable) { 249131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 250131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 251131a47e3SVlad Yasevich num_ext += 2; 252131a47e3SVlad Yasevich } 253131a47e3SVlad Yasevich 2546fc791eeSmalc if (sp->adaptation_ind) 2551da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2566fc791eeSmalc 2571da177e4SLinus Torvalds chunksize += vparam_len; 2581da177e4SLinus Torvalds 259730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 260730fc3d0SVlad Yasevich if (sctp_auth_enable) { 261730fc3d0SVlad Yasevich /* Add random parameter length*/ 262730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 263730fc3d0SVlad Yasevich 264730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 265730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 266730fc3d0SVlad Yasevich if (auth_hmacs->length) 267a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 268730fc3d0SVlad Yasevich else 269730fc3d0SVlad Yasevich auth_hmacs = NULL; 270730fc3d0SVlad Yasevich 271730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 272730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 273730fc3d0SVlad Yasevich if (auth_chunks->length) 274a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 275730fc3d0SVlad Yasevich else 2769baffaa6SVlad Yasevich auth_chunks = NULL; 277730fc3d0SVlad Yasevich 278730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 279730fc3d0SVlad Yasevich num_ext += 1; 280730fc3d0SVlad Yasevich } 281730fc3d0SVlad Yasevich 282131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 283131a47e3SVlad Yasevich if (num_ext) 284a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 285a8170c35SWei Yongjun num_ext); 286131a47e3SVlad Yasevich 2871da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2881da177e4SLinus Torvalds * 2891da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 2901da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 2911da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 2921da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 2931da177e4SLinus Torvalds * other address types if the Host Name address parameter is 2941da177e4SLinus Torvalds * present in the received INIT chunk. 2951da177e4SLinus Torvalds * 2961da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 2971da177e4SLinus Torvalds */ 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize); 3001da177e4SLinus Torvalds if (!retval) 3011da177e4SLinus Torvalds goto nodata; 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds retval->subh.init_hdr = 3041da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3051da177e4SLinus Torvalds retval->param_hdr.v = 3061da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3091da177e4SLinus Torvalds * 3101da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3111da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3121da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3131da177e4SLinus Torvalds * support any address type. 3141da177e4SLinus Torvalds */ 3151da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3161da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3171da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3181da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 321131a47e3SVlad Yasevich 3227aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 323131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 324131a47e3SVlad Yasevich */ 325131a47e3SVlad Yasevich if (num_ext) { 326131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 327131a47e3SVlad Yasevich ext_param.param_hdr.length = 328131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 329131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 330131a47e3SVlad Yasevich &ext_param); 3318ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 332131a47e3SVlad Yasevich } 333131a47e3SVlad Yasevich 3341da177e4SLinus Torvalds if (sctp_prsctp_enable) 3351da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 336131a47e3SVlad Yasevich 3376fc791eeSmalc if (sp->adaptation_ind) { 3380f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3391da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3400f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3411da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3426fc791eeSmalc } 343131a47e3SVlad Yasevich 344730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 345730fc3d0SVlad Yasevich if (sctp_auth_enable) { 346730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 347730fc3d0SVlad Yasevich asoc->c.auth_random); 348730fc3d0SVlad Yasevich if (auth_hmacs) 349730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 350730fc3d0SVlad Yasevich auth_hmacs); 351730fc3d0SVlad Yasevich if (auth_chunks) 352730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 353730fc3d0SVlad Yasevich auth_chunks); 354730fc3d0SVlad Yasevich } 3551da177e4SLinus Torvalds nodata: 3561da177e4SLinus Torvalds kfree(addrs.v); 3571da177e4SLinus Torvalds return retval; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3611da177e4SLinus Torvalds const struct sctp_chunk *chunk, 362dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3631da177e4SLinus Torvalds { 3641da177e4SLinus Torvalds sctp_inithdr_t initack; 3651da177e4SLinus Torvalds struct sctp_chunk *retval; 3661da177e4SLinus Torvalds union sctp_params addrs; 3676fc791eeSmalc struct sctp_sock *sp; 3681da177e4SLinus Torvalds int addrs_len; 3691da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3701da177e4SLinus Torvalds int cookie_len; 3711da177e4SLinus Torvalds size_t chunksize; 3720f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 373131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 374131a47e3SVlad Yasevich int num_ext = 0; 375131a47e3SVlad Yasevich __u8 extensions[3]; 376730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 377730fc3d0SVlad Yasevich *auth_hmacs = NULL, 378730fc3d0SVlad Yasevich *auth_random = NULL; 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds retval = NULL; 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 3831da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 3861da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 3871da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 3881da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 3891da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 3921da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 3931da177e4SLinus Torvalds */ 3941da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 3951da177e4SLinus Torvalds addrs.v, addrs_len); 3961da177e4SLinus Torvalds if (!cookie) 3971da177e4SLinus Torvalds goto nomem_cookie; 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4001da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4011da177e4SLinus Torvalds */ 4026fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4031da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4061da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4071da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4081da177e4SLinus Torvalds 4095ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 410036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 411036b579bSVlad Yasevich 4125ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 413131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 414131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 415131a47e3SVlad Yasevich num_ext += 2; 416131a47e3SVlad Yasevich } 417131a47e3SVlad Yasevich 4186fc791eeSmalc if (sp->adaptation_ind) 4191da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4201da177e4SLinus Torvalds 421730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 422730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 423730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 424730fc3d0SVlad Yasevich 425730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 426730fc3d0SVlad Yasevich if (auth_hmacs->length) 427a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 428730fc3d0SVlad Yasevich else 429730fc3d0SVlad Yasevich auth_hmacs = NULL; 430730fc3d0SVlad Yasevich 431730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 432730fc3d0SVlad Yasevich if (auth_chunks->length) 433a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 434730fc3d0SVlad Yasevich else 435730fc3d0SVlad Yasevich auth_chunks = NULL; 436730fc3d0SVlad Yasevich 437730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 438730fc3d0SVlad Yasevich num_ext += 1; 439730fc3d0SVlad Yasevich } 440730fc3d0SVlad Yasevich 4418ee4be37SVlad Yasevich if (num_ext) 442a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 443a8170c35SWei Yongjun num_ext); 4448ee4be37SVlad Yasevich 4451da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 4461da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize); 4471da177e4SLinus Torvalds if (!retval) 4481da177e4SLinus Torvalds goto nomem_chunk; 4491da177e4SLinus Torvalds 450b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 451b99a4d53SDan Carpenter * 452b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 453b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 454b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 455b99a4d53SDan Carpenter * to which it is replying. 456b99a4d53SDan Carpenter * 457b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4581da177e4SLinus Torvalds */ 4591da177e4SLinus Torvalds retval->transport = chunk->transport; 460b99a4d53SDan Carpenter 4611da177e4SLinus Torvalds retval->subh.init_hdr = 4621da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4631da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4641da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4651da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4661da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 467131a47e3SVlad Yasevich if (num_ext) { 468131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 469131a47e3SVlad Yasevich ext_param.param_hdr.length = 470131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 471131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 472131a47e3SVlad Yasevich &ext_param); 4738ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 474131a47e3SVlad Yasevich } 4751da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 4761da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 4771da177e4SLinus Torvalds 4786fc791eeSmalc if (sp->adaptation_ind) { 4790f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 4801da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 4816fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 4821da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 4836fc791eeSmalc } 4841da177e4SLinus Torvalds 485730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 486730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 487730fc3d0SVlad Yasevich auth_random); 488730fc3d0SVlad Yasevich if (auth_hmacs) 489730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 490730fc3d0SVlad Yasevich auth_hmacs); 491730fc3d0SVlad Yasevich if (auth_chunks) 492730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 493730fc3d0SVlad Yasevich auth_chunks); 494730fc3d0SVlad Yasevich } 495730fc3d0SVlad Yasevich 4961da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 4971da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds nomem_chunk: 5001da177e4SLinus Torvalds kfree(cookie); 5011da177e4SLinus Torvalds nomem_cookie: 5021da177e4SLinus Torvalds kfree(addrs.v); 5031da177e4SLinus Torvalds return retval; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5071da177e4SLinus Torvalds * 5081da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5091da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5101da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5111da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5121da177e4SLinus Torvalds * chunks in the same packet. 5131da177e4SLinus Torvalds * 5141da177e4SLinus Torvalds * 0 1 2 3 5151da177e4SLinus 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 5161da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5171da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5181da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5191da177e4SLinus Torvalds * / Cookie / 5201da177e4SLinus Torvalds * \ \ 5211da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5221da177e4SLinus Torvalds * 5231da177e4SLinus Torvalds * Chunk Flags: 8 bit 5241da177e4SLinus Torvalds * 5251da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5261da177e4SLinus Torvalds * 5271da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5281da177e4SLinus Torvalds * 5291da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5301da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5311da177e4SLinus Torvalds * 5321da177e4SLinus Torvalds * Cookie: variable size 5331da177e4SLinus Torvalds * 5341da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5351da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5361da177e4SLinus Torvalds * 5371da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5381da177e4SLinus Torvalds * to insure interoperability. 5391da177e4SLinus Torvalds */ 5401da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5411da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5421da177e4SLinus Torvalds { 5431da177e4SLinus Torvalds struct sctp_chunk *retval; 5441da177e4SLinus Torvalds void *cookie; 5451da177e4SLinus Torvalds int cookie_len; 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5481da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 5511da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); 5521da177e4SLinus Torvalds if (!retval) 5531da177e4SLinus Torvalds goto nodata; 5541da177e4SLinus Torvalds retval->subh.cookie_hdr = 5551da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5581da177e4SLinus Torvalds * 5591da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5601da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5611da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5621da177e4SLinus Torvalds * to which it is replying. 5631da177e4SLinus Torvalds * 5641da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5651da177e4SLinus Torvalds */ 5661da177e4SLinus Torvalds if (chunk) 5671da177e4SLinus Torvalds retval->transport = chunk->transport; 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds nodata: 5701da177e4SLinus Torvalds return retval; 5711da177e4SLinus Torvalds } 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5741da177e4SLinus Torvalds * 5751da177e4SLinus Torvalds * This chunk is used only during the initialization of an 5761da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 5771da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 5781da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 5791da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 5801da177e4SLinus Torvalds * 5811da177e4SLinus Torvalds * 0 1 2 3 5821da177e4SLinus 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 5831da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5841da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 5851da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5861da177e4SLinus Torvalds * 5871da177e4SLinus Torvalds * Chunk Flags: 8 bits 5881da177e4SLinus Torvalds * 5891da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5901da177e4SLinus Torvalds */ 5911da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 5921da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5931da177e4SLinus Torvalds { 5941da177e4SLinus Torvalds struct sctp_chunk *retval; 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0); 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5991da177e4SLinus Torvalds * 6001da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6011da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6021da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6031da177e4SLinus Torvalds * to which it is replying. 6041da177e4SLinus Torvalds * 6051da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6061da177e4SLinus Torvalds */ 6071da177e4SLinus Torvalds if (retval && chunk) 6081da177e4SLinus Torvalds retval->transport = chunk->transport; 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds return retval; 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds /* 6141da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6151da177e4SLinus Torvalds * CWR: 6161da177e4SLinus Torvalds * 6171da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6181da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6191da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6201da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6211da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6221da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6231da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6241da177e4SLinus Torvalds * CE bit. 6251da177e4SLinus Torvalds * 6261da177e4SLinus Torvalds * 0 1 2 3 6271da177e4SLinus 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 6281da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6291da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6301da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6311da177e4SLinus Torvalds * | Lowest TSN Number | 6321da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6331da177e4SLinus Torvalds * 6341da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6351da177e4SLinus Torvalds */ 6361da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6371da177e4SLinus Torvalds const __u32 lowest_tsn, 6381da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6391da177e4SLinus Torvalds { 6401da177e4SLinus Torvalds struct sctp_chunk *retval; 6411da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 6441da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0, 6451da177e4SLinus Torvalds sizeof(sctp_cwrhdr_t)); 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds if (!retval) 6481da177e4SLinus Torvalds goto nodata; 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6511da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6541da177e4SLinus Torvalds * 6551da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6561da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6571da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6581da177e4SLinus Torvalds * to which it is replying. 6591da177e4SLinus Torvalds * 6601da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6611da177e4SLinus Torvalds * came from.] 6621da177e4SLinus Torvalds */ 6631da177e4SLinus Torvalds if (chunk) 6641da177e4SLinus Torvalds retval->transport = chunk->transport; 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds nodata: 6671da177e4SLinus Torvalds return retval; 6681da177e4SLinus Torvalds } 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6711da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6721da177e4SLinus Torvalds const __u32 lowest_tsn) 6731da177e4SLinus Torvalds { 6741da177e4SLinus Torvalds struct sctp_chunk *retval; 6751da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 6781da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0, 6791da177e4SLinus Torvalds sizeof(sctp_ecnehdr_t)); 6801da177e4SLinus Torvalds if (!retval) 6811da177e4SLinus Torvalds goto nodata; 6821da177e4SLinus Torvalds retval->subh.ecne_hdr = 6831da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds nodata: 6861da177e4SLinus Torvalds return retval; 6871da177e4SLinus Torvalds } 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 6901da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 6911da177e4SLinus Torvalds */ 6921da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 6931da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 6941da177e4SLinus Torvalds int data_len, __u8 flags, __u16 ssn) 6951da177e4SLinus Torvalds { 6961da177e4SLinus Torvalds struct sctp_chunk *retval; 6971da177e4SLinus Torvalds struct sctp_datahdr dp; 6981da177e4SLinus Torvalds int chunk_len; 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7011da177e4SLinus Torvalds * creating the chunk. 7021da177e4SLinus Torvalds */ 7031da177e4SLinus Torvalds dp.tsn = 0; 7041da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 7051da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 708eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 7091da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7101da177e4SLinus Torvalds dp.ssn = 0; 7111da177e4SLinus Torvalds } else 7121da177e4SLinus Torvalds dp.ssn = htons(ssn); 7131da177e4SLinus Torvalds 7141da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 7151da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len); 7161da177e4SLinus Torvalds if (!retval) 7171da177e4SLinus Torvalds goto nodata; 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7201da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds nodata: 7231da177e4SLinus Torvalds return retval; 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7271da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7281da177e4SLinus Torvalds * including duplicates and gaps. 7291da177e4SLinus Torvalds */ 7301da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7311da177e4SLinus Torvalds { 7321da177e4SLinus Torvalds struct sctp_chunk *retval; 7331da177e4SLinus Torvalds struct sctp_sackhdr sack; 7341da177e4SLinus Torvalds int len; 7351da177e4SLinus Torvalds __u32 ctsn; 7361da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7374244854dSNeil Horman struct sctp_association *aptr = (struct sctp_association *)asoc; 7381da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 73902015180SVlad Yasevich struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 7404244854dSNeil Horman struct sctp_transport *trans; 7411da177e4SLinus Torvalds 74202015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7431da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 7441da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn); 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 74702015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7481da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds /* Initialize the SACK header. */ 7511da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7521da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7531da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7541da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds len = sizeof(sack) 7571da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7581da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds /* Create the chunk. */ 7611da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len); 7621da177e4SLinus Torvalds if (!retval) 7631da177e4SLinus Torvalds goto nodata; 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7661da177e4SLinus Torvalds * 7671da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7681da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7691da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7701da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7711da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7721da177e4SLinus Torvalds * reply chunk. 7731da177e4SLinus Torvalds * 7741da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 7751da177e4SLinus Torvalds * in packets from different source addresses in a single 7761da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 7771da177e4SLinus Torvalds * destination transport addresses from which the DATA or 7781da177e4SLinus Torvalds * control chunks being acknowledged were received. 7791da177e4SLinus Torvalds * 7801da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 7811da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 7821da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 7831da177e4SLinus Torvalds * duplicates. --piggy] 7841da177e4SLinus Torvalds * 7851da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 7861da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 7871da177e4SLinus Torvalds * destination address and not use the source address of the 7881da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 7891da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 7901da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 7911da177e4SLinus Torvalds * for the SACK is broken. 7921da177e4SLinus Torvalds * 7931da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 7941da177e4SLinus Torvalds */ 7951da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 7961da177e4SLinus Torvalds 7971da177e4SLinus Torvalds retval->subh.sack_hdr = 7981da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 7991da177e4SLinus Torvalds 8001da177e4SLinus Torvalds /* Add the gap ack block information. */ 8011da177e4SLinus Torvalds if (num_gabs) 8021da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 80302015180SVlad Yasevich gabs); 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 8061da177e4SLinus Torvalds if (num_dup_tsns) 8071da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8081da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 8091da177e4SLinus Torvalds 8104244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8114244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8124244854dSNeil Horman * the association generation to 1 8134244854dSNeil Horman * 8144244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8154244854dSNeil Horman * association so no transport will match after a wrap event like this, 8164244854dSNeil Horman * Until the next sack 8174244854dSNeil Horman */ 8184244854dSNeil Horman if (++aptr->peer.sack_generation == 0) { 8194244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8204244854dSNeil Horman transports) 8214244854dSNeil Horman trans->sack_generation = 0; 8224244854dSNeil Horman aptr->peer.sack_generation = 1; 8234244854dSNeil Horman } 8241da177e4SLinus Torvalds nodata: 8251da177e4SLinus Torvalds return retval; 8261da177e4SLinus Torvalds } 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8291da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8301da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8311da177e4SLinus Torvalds { 8321da177e4SLinus Torvalds struct sctp_chunk *retval; 8331da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 8341da177e4SLinus Torvalds __u32 ctsn; 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8371da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8381da177e4SLinus Torvalds 8391da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0, 8401da177e4SLinus Torvalds sizeof(sctp_shutdownhdr_t)); 8411da177e4SLinus Torvalds if (!retval) 8421da177e4SLinus Torvalds goto nodata; 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8451da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds if (chunk) 8481da177e4SLinus Torvalds retval->transport = chunk->transport; 8491da177e4SLinus Torvalds nodata: 8501da177e4SLinus Torvalds return retval; 8511da177e4SLinus Torvalds } 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8541da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8551da177e4SLinus Torvalds { 8561da177e4SLinus Torvalds struct sctp_chunk *retval; 8571da177e4SLinus Torvalds 8581da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8611da177e4SLinus Torvalds * 8621da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8631da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8641da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8651da177e4SLinus Torvalds * to which it is replying. 8661da177e4SLinus Torvalds * 8671da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8681da177e4SLinus Torvalds */ 8691da177e4SLinus Torvalds if (retval && chunk) 8701da177e4SLinus Torvalds retval->transport = chunk->transport; 8711da177e4SLinus Torvalds 8721da177e4SLinus Torvalds return retval; 8731da177e4SLinus Torvalds } 8741da177e4SLinus Torvalds 8751da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 8761da177e4SLinus Torvalds const struct sctp_association *asoc, 8771da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8781da177e4SLinus Torvalds { 8791da177e4SLinus Torvalds struct sctp_chunk *retval; 8801da177e4SLinus Torvalds __u8 flags = 0; 8811da177e4SLinus Torvalds 882047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 883047a2428SJerome Forissier * reflected) 884047a2428SJerome Forissier */ 8851da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 8861da177e4SLinus Torvalds 8871da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8901da177e4SLinus Torvalds * 8911da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8921da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8931da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8941da177e4SLinus Torvalds * to which it is replying. 8951da177e4SLinus Torvalds * 8961da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 8971da177e4SLinus Torvalds * came from.] 8981da177e4SLinus Torvalds */ 8991da177e4SLinus Torvalds if (retval && chunk) 9001da177e4SLinus Torvalds retval->transport = chunk->transport; 9011da177e4SLinus Torvalds 9021da177e4SLinus Torvalds return retval; 9031da177e4SLinus Torvalds } 9041da177e4SLinus Torvalds 9051da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 906047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9071da177e4SLinus Torvalds */ 9081da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9091da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9101da177e4SLinus Torvalds const size_t hint) 9111da177e4SLinus Torvalds { 9121da177e4SLinus Torvalds struct sctp_chunk *retval; 9131da177e4SLinus Torvalds __u8 flags = 0; 9141da177e4SLinus Torvalds 915047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 916047a2428SJerome Forissier * an INIT (vtag will be reflected). 917047a2428SJerome Forissier */ 918047a2428SJerome Forissier if (!asoc) { 919047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 920047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 921047a2428SJerome Forissier flags = 0; 922047a2428SJerome Forissier else 923047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 924047a2428SJerome Forissier } 9251da177e4SLinus Torvalds 9261da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint); 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9291da177e4SLinus Torvalds * 9301da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9311da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9321da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9331da177e4SLinus Torvalds * to which it is replying. 9341da177e4SLinus Torvalds * 9351da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9361da177e4SLinus Torvalds */ 9371da177e4SLinus Torvalds if (retval && chunk) 9381da177e4SLinus Torvalds retval->transport = chunk->transport; 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds return retval; 9411da177e4SLinus Torvalds } 9421da177e4SLinus Torvalds 9431da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9441da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9451da177e4SLinus Torvalds const struct sctp_association *asoc, 9461da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 9471da177e4SLinus Torvalds { 9481da177e4SLinus Torvalds struct sctp_chunk *retval; 9499f81bcd9SAl Viro __be32 payload; 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9521da177e4SLinus Torvalds + sizeof(tsn)); 9531da177e4SLinus Torvalds 9541da177e4SLinus Torvalds if (!retval) 9551da177e4SLinus Torvalds goto no_mem; 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9581da177e4SLinus Torvalds payload = htonl(tsn); 95900f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 96000f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9611da177e4SLinus Torvalds 9621da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9631da177e4SLinus Torvalds * 9641da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9651da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9661da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9671da177e4SLinus Torvalds * to which it is replying. 9681da177e4SLinus Torvalds * 9691da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9701da177e4SLinus Torvalds */ 9711da177e4SLinus Torvalds if (chunk) 9721da177e4SLinus Torvalds retval->transport = chunk->transport; 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds no_mem: 9751da177e4SLinus Torvalds return retval; 9761da177e4SLinus Torvalds } 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 9791da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 980c164a9baSSridhar Samudrala const struct msghdr *msg, 981c164a9baSSridhar Samudrala size_t paylen) 9821da177e4SLinus Torvalds { 9831da177e4SLinus Torvalds struct sctp_chunk *retval; 984c164a9baSSridhar Samudrala void *payload = NULL; 985c164a9baSSridhar Samudrala int err; 9861da177e4SLinus Torvalds 987c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 9881da177e4SLinus Torvalds if (!retval) 9891da177e4SLinus Torvalds goto err_chunk; 9901da177e4SLinus Torvalds 9911da177e4SLinus Torvalds if (paylen) { 9921da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 993c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 9941da177e4SLinus Torvalds if (!payload) 9951da177e4SLinus Torvalds goto err_payload; 9961da177e4SLinus Torvalds 997c164a9baSSridhar Samudrala err = memcpy_fromiovec(payload, msg->msg_iov, paylen); 998c164a9baSSridhar Samudrala if (err < 0) 9991da177e4SLinus Torvalds goto err_copy; 10001da177e4SLinus Torvalds } 10011da177e4SLinus Torvalds 100200f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 100300f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10041da177e4SLinus Torvalds 10051da177e4SLinus Torvalds if (paylen) 10061da177e4SLinus Torvalds kfree(payload); 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds return retval; 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds err_copy: 10111da177e4SLinus Torvalds kfree(payload); 10121da177e4SLinus Torvalds err_payload: 10131da177e4SLinus Torvalds sctp_chunk_free(retval); 10141da177e4SLinus Torvalds retval = NULL; 10151da177e4SLinus Torvalds err_chunk: 10161da177e4SLinus Torvalds return retval; 10171da177e4SLinus Torvalds } 10181da177e4SLinus Torvalds 10195c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10205c94bf86SAdrian Bunk * enough. 10215c94bf86SAdrian Bunk */ 10225c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10235c94bf86SAdrian Bunk const void *data) 10245c94bf86SAdrian Bunk { 10255c94bf86SAdrian Bunk void *target; 10265c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 10275c94bf86SAdrian Bunk 10285c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10295c94bf86SAdrian Bunk 10306383cfb3SVlad Yasevich if (data) 10315c94bf86SAdrian Bunk memcpy(target, data, len); 10326383cfb3SVlad Yasevich else 10336383cfb3SVlad Yasevich memset(target, 0, len); 10345c94bf86SAdrian Bunk 10355c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10365c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10375c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10385c94bf86SAdrian Bunk 10395c94bf86SAdrian Bunk return target; 10405c94bf86SAdrian Bunk } 10415c94bf86SAdrian Bunk 10421da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10431da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10441da177e4SLinus Torvalds const struct sctp_association *asoc, 10451da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10461da177e4SLinus Torvalds const __u8 *payload, 10471da177e4SLinus Torvalds const size_t paylen) 10481da177e4SLinus Torvalds { 10491da177e4SLinus Torvalds struct sctp_chunk *retval; 10501da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 105300f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10541da177e4SLinus Torvalds if (!retval) 10551da177e4SLinus Torvalds goto end; 10561da177e4SLinus Torvalds 105700f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 105800f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10591da177e4SLinus Torvalds 10601da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10611da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 106200f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 106300f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 10641da177e4SLinus Torvalds 10651da177e4SLinus Torvalds end: 10661da177e4SLinus Torvalds return retval; 10671da177e4SLinus Torvalds } 10681da177e4SLinus Torvalds 1069ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1070ba016670SWei Yongjun const struct sctp_association *asoc, 1071ba016670SWei Yongjun const struct sctp_chunk *chunk, 1072ba016670SWei Yongjun struct sctp_paramhdr *param) 1073ba016670SWei Yongjun { 1074ba016670SWei Yongjun struct sctp_chunk *retval; 1075ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1076ba016670SWei Yongjun size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + 1077ba016670SWei Yongjun sizeof(sctp_paramhdr_t); 1078ba016670SWei Yongjun 1079ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1080ba016670SWei Yongjun if (!retval) 1081ba016670SWei Yongjun goto nodata; 1082ba016670SWei Yongjun 1083ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 1084ba016670SWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 1085ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 1086ba016670SWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); 1087ba016670SWei Yongjun 1088ba016670SWei Yongjun nodata: 1089ba016670SWei Yongjun return retval; 1090ba016670SWei Yongjun } 1091ba016670SWei Yongjun 10921da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 10931da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 109492c73af5SWei Yongjun const struct sctp_transport *transport) 10951da177e4SLinus Torvalds { 109692c73af5SWei Yongjun struct sctp_chunk *retval; 109792c73af5SWei Yongjun sctp_sender_hb_info_t hbinfo; 109892c73af5SWei Yongjun 109992c73af5SWei Yongjun retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo)); 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds if (!retval) 11021da177e4SLinus Torvalds goto nodata; 11031da177e4SLinus Torvalds 110492c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 110592c73af5SWei Yongjun hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t)); 110692c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 110792c73af5SWei Yongjun hbinfo.sent_at = jiffies; 110892c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 110992c73af5SWei Yongjun 11101da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11111da177e4SLinus Torvalds * what transport it belongs to. 11121da177e4SLinus Torvalds */ 11131da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 111492c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 111592c73af5SWei Yongjun &hbinfo); 11161da177e4SLinus Torvalds 11171da177e4SLinus Torvalds nodata: 11181da177e4SLinus Torvalds return retval; 11191da177e4SLinus Torvalds } 11201da177e4SLinus Torvalds 11211da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11221da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11231da177e4SLinus Torvalds const void *payload, const size_t paylen) 11241da177e4SLinus Torvalds { 11251da177e4SLinus Torvalds struct sctp_chunk *retval; 11261da177e4SLinus Torvalds 11271da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); 11281da177e4SLinus Torvalds if (!retval) 11291da177e4SLinus Torvalds goto nodata; 11301da177e4SLinus Torvalds 11311da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11321da177e4SLinus Torvalds 11331da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11341da177e4SLinus Torvalds * 11351da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11361da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11371da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11381da177e4SLinus Torvalds * to which it is replying. 11391da177e4SLinus Torvalds * 11401da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 11411da177e4SLinus Torvalds */ 11421da177e4SLinus Torvalds if (chunk) 11431da177e4SLinus Torvalds retval->transport = chunk->transport; 11441da177e4SLinus Torvalds 11451da177e4SLinus Torvalds nodata: 11461da177e4SLinus Torvalds return retval; 11471da177e4SLinus Torvalds } 11481da177e4SLinus Torvalds 11491da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 11501da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 11511da177e4SLinus Torvalds */ 11521da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 11531da177e4SLinus Torvalds const struct sctp_association *asoc, 11541da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11551da177e4SLinus Torvalds size_t size) 11561da177e4SLinus Torvalds { 11571da177e4SLinus Torvalds struct sctp_chunk *retval; 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0, 11601da177e4SLinus Torvalds sizeof(sctp_errhdr_t) + size); 11611da177e4SLinus Torvalds if (!retval) 11621da177e4SLinus Torvalds goto nodata; 11631da177e4SLinus Torvalds 11641da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11651da177e4SLinus Torvalds * 11661da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11671da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 11681da177e4SLinus Torvalds * address from which it received the DATA or control chunk 11691da177e4SLinus Torvalds * to which it is replying. 11701da177e4SLinus Torvalds * 11711da177e4SLinus Torvalds */ 11721da177e4SLinus Torvalds if (chunk) 11731da177e4SLinus Torvalds retval->transport = chunk->transport; 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds nodata: 11761da177e4SLinus Torvalds return retval; 11771da177e4SLinus Torvalds } 11781da177e4SLinus Torvalds 11795fa782c2SNeil Horman /* Create an Operation Error chunk of a fixed size, 11805fa782c2SNeil Horman * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) 11815fa782c2SNeil Horman * This is a helper function to allocate an error chunk for 11825fa782c2SNeil Horman * for those invalid parameter codes in which we may not want 11835fa782c2SNeil Horman * to report all the errors, if the incomming chunk is large 11845fa782c2SNeil Horman */ 11855fa782c2SNeil Horman static inline struct sctp_chunk *sctp_make_op_error_fixed( 11865fa782c2SNeil Horman const struct sctp_association *asoc, 11875fa782c2SNeil Horman const struct sctp_chunk *chunk) 11885fa782c2SNeil Horman { 11895fa782c2SNeil Horman size_t size = asoc ? asoc->pathmtu : 0; 11905fa782c2SNeil Horman 11915fa782c2SNeil Horman if (!size) 11925fa782c2SNeil Horman size = SCTP_DEFAULT_MAXSEGMENT; 11935fa782c2SNeil Horman 11945fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 11955fa782c2SNeil Horman } 11965fa782c2SNeil Horman 11971da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 11981da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 11991da177e4SLinus Torvalds const struct sctp_chunk *chunk, 120063706c5cSAl Viro __be16 cause_code, const void *payload, 12016383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12021da177e4SLinus Torvalds { 12031da177e4SLinus Torvalds struct sctp_chunk *retval; 12041da177e4SLinus Torvalds 12056383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12061da177e4SLinus Torvalds if (!retval) 12071da177e4SLinus Torvalds goto nodata; 12081da177e4SLinus Torvalds 12096383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 121000f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12116383cfb3SVlad Yasevich if (reserve_tail) 12126383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12131da177e4SLinus Torvalds 12141da177e4SLinus Torvalds nodata: 12151da177e4SLinus Torvalds return retval; 12161da177e4SLinus Torvalds } 12171da177e4SLinus Torvalds 12184cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 12194cd57c80SVlad Yasevich { 12204cd57c80SVlad Yasevich struct sctp_chunk *retval; 12214cd57c80SVlad Yasevich struct sctp_hmac *hmac_desc; 12224cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 12234cd57c80SVlad Yasevich __u8 *hmac; 12244cd57c80SVlad Yasevich 12254cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12264cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12274cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12284cd57c80SVlad Yasevich return NULL; 12294cd57c80SVlad Yasevich 12304cd57c80SVlad Yasevich retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0, 12314cd57c80SVlad Yasevich hmac_desc->hmac_len + sizeof(sctp_authhdr_t)); 12324cd57c80SVlad Yasevich if (!retval) 12334cd57c80SVlad Yasevich return NULL; 12344cd57c80SVlad Yasevich 12354cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 12364cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 12374cd57c80SVlad Yasevich 12384cd57c80SVlad Yasevich retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), 12394cd57c80SVlad Yasevich &auth_hdr); 12404cd57c80SVlad Yasevich 12414cd57c80SVlad Yasevich hmac = skb_put(retval->skb, hmac_desc->hmac_len); 12424cd57c80SVlad Yasevich memset(hmac, 0, hmac_desc->hmac_len); 12434cd57c80SVlad Yasevich 12444cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 12454cd57c80SVlad Yasevich retval->chunk_hdr->length = 12464cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 12474cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 12484cd57c80SVlad Yasevich 12494cd57c80SVlad Yasevich return retval; 12504cd57c80SVlad Yasevich } 12514cd57c80SVlad Yasevich 12524cd57c80SVlad Yasevich 12531da177e4SLinus Torvalds /******************************************************************** 12541da177e4SLinus Torvalds * 2nd Level Abstractions 12551da177e4SLinus Torvalds ********************************************************************/ 12561da177e4SLinus Torvalds 12571da177e4SLinus Torvalds /* Turn an skb into a chunk. 12581da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 12591da177e4SLinus Torvalds */ 12601da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 12611da177e4SLinus Torvalds const struct sctp_association *asoc, 12621da177e4SLinus Torvalds struct sock *sk) 12631da177e4SLinus Torvalds { 12641da177e4SLinus Torvalds struct sctp_chunk *retval; 12651da177e4SLinus Torvalds 1266c3762229SRobert P. J. Day retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC); 12671da177e4SLinus Torvalds 12681da177e4SLinus Torvalds if (!retval) 12691da177e4SLinus Torvalds goto nodata; 12701da177e4SLinus Torvalds 12711da177e4SLinus Torvalds if (!sk) { 12721da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb); 12731da177e4SLinus Torvalds } 12741da177e4SLinus Torvalds 127579af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 12761da177e4SLinus Torvalds retval->skb = skb; 12771da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 12781da177e4SLinus Torvalds retval->has_tsn = 0; 12791da177e4SLinus Torvalds retval->has_ssn = 0; 12801da177e4SLinus Torvalds retval->rtt_in_progress = 0; 12811da177e4SLinus Torvalds retval->sent_at = 0; 12821da177e4SLinus Torvalds retval->singleton = 1; 12831da177e4SLinus Torvalds retval->end_of_packet = 0; 12841da177e4SLinus Torvalds retval->ecn_ce_done = 0; 12851da177e4SLinus Torvalds retval->pdiscard = 0; 12861da177e4SLinus Torvalds 12871da177e4SLinus Torvalds /* sctpimpguide-05.txt Section 2.8.2 12881da177e4SLinus Torvalds * M1) Each time a new DATA chunk is transmitted 12891da177e4SLinus Torvalds * set the 'TSN.Missing.Report' count for that TSN to 0. The 12901da177e4SLinus Torvalds * 'TSN.Missing.Report' count will be used to determine missing chunks 12911da177e4SLinus Torvalds * and when to fast retransmit. 12921da177e4SLinus Torvalds */ 12931da177e4SLinus Torvalds retval->tsn_missing_report = 0; 12941da177e4SLinus Torvalds retval->tsn_gap_acked = 0; 1295c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 12961da177e4SLinus Torvalds 12971da177e4SLinus Torvalds /* If this is a fragmented message, track all fragments 12981da177e4SLinus Torvalds * of the message (for SEND_FAILED). 12991da177e4SLinus Torvalds */ 13001da177e4SLinus Torvalds retval->msg = NULL; 13011da177e4SLinus Torvalds 13021da177e4SLinus Torvalds /* Polish the bead hole. */ 13031da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13041da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13051da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 13061da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 13071da177e4SLinus Torvalds 13081da177e4SLinus Torvalds nodata: 13091da177e4SLinus Torvalds return retval; 13101da177e4SLinus Torvalds } 13111da177e4SLinus Torvalds 13121da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13131da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13141da177e4SLinus Torvalds union sctp_addr *dest) 13151da177e4SLinus Torvalds { 1316f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 131716b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13181da177e4SLinus Torvalds } 13191da177e4SLinus Torvalds 13201da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13211da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13221da177e4SLinus Torvalds { 13231da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13241da177e4SLinus Torvalds if (chunk->transport) { 13256a1e5f33SAl Viro return &chunk->transport->ipaddr; 13261da177e4SLinus Torvalds } else { 13271da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13286a1e5f33SAl Viro return &chunk->source; 13291da177e4SLinus Torvalds } 13301da177e4SLinus Torvalds } 13311da177e4SLinus Torvalds 13321da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13331da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13341da177e4SLinus Torvalds */ 13351da177e4SLinus Torvalds SCTP_STATIC 13361da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 13371da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen) 13381da177e4SLinus Torvalds { 13391da177e4SLinus Torvalds struct sctp_chunk *retval; 13401da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 13411da177e4SLinus Torvalds struct sk_buff *skb; 13421da177e4SLinus Torvalds struct sock *sk; 13431da177e4SLinus Torvalds 13441da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 13451da177e4SLinus Torvalds skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), 13461da177e4SLinus Torvalds GFP_ATOMIC); 13471da177e4SLinus Torvalds if (!skb) 13481da177e4SLinus Torvalds goto nodata; 13491da177e4SLinus Torvalds 13501da177e4SLinus Torvalds /* Make room for the chunk header. */ 13511da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 13521da177e4SLinus Torvalds chunk_hdr->type = type; 13531da177e4SLinus Torvalds chunk_hdr->flags = flags; 13541da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 13551da177e4SLinus Torvalds 13561da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 13571da177e4SLinus Torvalds retval = sctp_chunkify(skb, asoc, sk); 13581da177e4SLinus Torvalds if (!retval) { 13591da177e4SLinus Torvalds kfree_skb(skb); 13601da177e4SLinus Torvalds goto nodata; 13611da177e4SLinus Torvalds } 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 13641da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 13651da177e4SLinus Torvalds 13664cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 13674cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 13684cd57c80SVlad Yasevich retval->auth = 1; 13694cd57c80SVlad Yasevich 13701da177e4SLinus Torvalds /* Set the skb to the belonging sock for accounting. */ 13711da177e4SLinus Torvalds skb->sk = sk; 13721da177e4SLinus Torvalds 13731da177e4SLinus Torvalds return retval; 13741da177e4SLinus Torvalds nodata: 13751da177e4SLinus Torvalds return NULL; 13761da177e4SLinus Torvalds } 13771da177e4SLinus Torvalds 13781da177e4SLinus Torvalds 13791da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 13801da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 13811da177e4SLinus Torvalds { 1382a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1383a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1384a08de64dSVlad Yasevich 13851da177e4SLinus Torvalds /* Free the chunk skb data and the SCTP_chunk stub itself. */ 13861da177e4SLinus Torvalds dev_kfree_skb(chunk->skb); 13871da177e4SLinus Torvalds 13881da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 13891da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 13901da177e4SLinus Torvalds } 13911da177e4SLinus Torvalds 13921da177e4SLinus Torvalds /* Possibly, free the chunk. */ 13931da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 13941da177e4SLinus Torvalds { 13951da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 13961da177e4SLinus Torvalds if (chunk->msg) 13971da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 13981da177e4SLinus Torvalds 13991da177e4SLinus Torvalds sctp_chunk_put(chunk); 14001da177e4SLinus Torvalds } 14011da177e4SLinus Torvalds 14021da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14031da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14041da177e4SLinus Torvalds { 14051da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 14061da177e4SLinus Torvalds } 14071da177e4SLinus Torvalds 14081da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14091da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14101da177e4SLinus Torvalds { 14111da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 14121da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14131da177e4SLinus Torvalds } 14141da177e4SLinus Torvalds 14151da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14161da177e4SLinus Torvalds * enough. 14171da177e4SLinus Torvalds */ 14181da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14191da177e4SLinus Torvalds { 14201da177e4SLinus Torvalds void *target; 14211da177e4SLinus Torvalds void *padding; 14221da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 14238d614adeSWei Yongjun int padlen = WORD_ROUND(chunklen) - chunklen; 14241da177e4SLinus Torvalds 14251da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 14261da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14271da177e4SLinus Torvalds 14281da177e4SLinus Torvalds memset(padding, 0, padlen); 14291da177e4SLinus Torvalds memcpy(target, data, len); 14301da177e4SLinus Torvalds 14311da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14321da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 143327a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14341da177e4SLinus Torvalds 14351da177e4SLinus Torvalds return target; 14361da177e4SLinus Torvalds } 14371da177e4SLinus Torvalds 14385fa782c2SNeil Horman /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient 14395fa782c2SNeil Horman * space in the chunk 14405fa782c2SNeil Horman */ 14415fa782c2SNeil Horman void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, 14425fa782c2SNeil Horman int len, const void *data) 14435fa782c2SNeil Horman { 14442e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) >= len) 14455fa782c2SNeil Horman return sctp_addto_chunk(chunk, len, data); 14465fa782c2SNeil Horman else 14475fa782c2SNeil Horman return NULL; 14485fa782c2SNeil Horman } 14495fa782c2SNeil Horman 14501da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 14511da177e4SLinus Torvalds * chunk is not big enough. 14521da177e4SLinus Torvalds * Returns a kernel err value. 14531da177e4SLinus Torvalds */ 14541da177e4SLinus Torvalds int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 14551da177e4SLinus Torvalds struct iovec *data) 14561da177e4SLinus Torvalds { 14571da177e4SLinus Torvalds __u8 *target; 14581da177e4SLinus Torvalds int err = 0; 14591da177e4SLinus Torvalds 14601da177e4SLinus Torvalds /* Make room in chunk for data. */ 14611da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14621da177e4SLinus Torvalds 14631da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 14641da177e4SLinus Torvalds if ((err = memcpy_fromiovecend(target, data, off, len))) 14651da177e4SLinus Torvalds goto out; 14661da177e4SLinus Torvalds 14671da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14681da177e4SLinus Torvalds chunk->chunk_hdr->length = 14691da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 147027a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14711da177e4SLinus Torvalds 14721da177e4SLinus Torvalds out: 14731da177e4SLinus Torvalds return err; 14741da177e4SLinus Torvalds } 14751da177e4SLinus Torvalds 14761da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 14771da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 14781da177e4SLinus Torvalds */ 14791da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 14801da177e4SLinus Torvalds { 1481ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1482ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1483ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 14841da177e4SLinus Torvalds __u16 ssn; 14851da177e4SLinus Torvalds __u16 sid; 14861da177e4SLinus Torvalds 14871da177e4SLinus Torvalds if (chunk->has_ssn) 14881da177e4SLinus Torvalds return; 14891da177e4SLinus Torvalds 1490ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1491ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1492ab3e5e7bSVlad Yasevich stream = &chunk->asoc->ssnmap->out; 1493ab3e5e7bSVlad Yasevich 1494ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1495ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1496ab3e5e7bSVlad Yasevich */ 1497ab3e5e7bSVlad Yasevich msg = chunk->msg; 1498ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1499ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15001da177e4SLinus Torvalds ssn = 0; 15011da177e4SLinus Torvalds } else { 1502ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1503ab3e5e7bSVlad Yasevich ssn = sctp_ssn_next(stream, sid); 15041da177e4SLinus Torvalds else 1505ab3e5e7bSVlad Yasevich ssn = sctp_ssn_peek(stream, sid); 15061da177e4SLinus Torvalds } 15071da177e4SLinus Torvalds 1508ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1509ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1510ab3e5e7bSVlad Yasevich } 15111da177e4SLinus Torvalds } 15121da177e4SLinus Torvalds 15131da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15141da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15151da177e4SLinus Torvalds */ 15161da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15171da177e4SLinus Torvalds { 15181da177e4SLinus Torvalds if (!chunk->has_tsn) { 15191da177e4SLinus Torvalds /* This is the last possible instant to 15201da177e4SLinus Torvalds * assign a TSN. 15211da177e4SLinus Torvalds */ 15221da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15231da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15241da177e4SLinus Torvalds chunk->has_tsn = 1; 15251da177e4SLinus Torvalds } 15261da177e4SLinus Torvalds } 15271da177e4SLinus Torvalds 15281da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15291da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15303182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1531dd0fc66fSAl Viro gfp_t gfp) 15321da177e4SLinus Torvalds { 15331da177e4SLinus Torvalds struct sctp_association *asoc; 15341da177e4SLinus Torvalds struct sk_buff *skb; 15351da177e4SLinus Torvalds sctp_scope_t scope; 15361da177e4SLinus Torvalds struct sctp_af *af; 15371da177e4SLinus Torvalds 15381da177e4SLinus Torvalds /* Create the bare association. */ 15391da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15401da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15411da177e4SLinus Torvalds if (!asoc) 15421da177e4SLinus Torvalds goto nodata; 15431da177e4SLinus Torvalds asoc->temp = 1; 15441da177e4SLinus Torvalds skb = chunk->skb; 15451da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1546eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); 15471da177e4SLinus Torvalds if (unlikely(!af)) 15481da177e4SLinus Torvalds goto fail; 1549d55c41b1SAl Viro af->from_skb(&asoc->c.peer_addr, skb, 1); 15501da177e4SLinus Torvalds nodata: 15511da177e4SLinus Torvalds return asoc; 15521da177e4SLinus Torvalds 15531da177e4SLinus Torvalds fail: 15541da177e4SLinus Torvalds sctp_association_free(asoc); 15551da177e4SLinus Torvalds return NULL; 15561da177e4SLinus Torvalds } 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds /* Build a cookie representing asoc. 15591da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 15601da177e4SLinus Torvalds */ 15611da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 15621da177e4SLinus Torvalds const struct sctp_association *asoc, 15631da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 15641da177e4SLinus Torvalds int *cookie_len, 15651da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 15661da177e4SLinus Torvalds { 15671da177e4SLinus Torvalds sctp_cookie_param_t *retval; 15681da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 15691da177e4SLinus Torvalds struct scatterlist sg; 15701da177e4SLinus Torvalds int headersize, bodysize; 15711da177e4SLinus Torvalds unsigned int keylen; 15721da177e4SLinus Torvalds char *key; 15731da177e4SLinus Torvalds 15749834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 15759834a2bbSVlad Yasevich * any padding. 15769834a2bbSVlad Yasevich */ 15779834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 15789834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 15799834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 15801da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 15811da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 15821da177e4SLinus Torvalds 15831da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 15841da177e4SLinus Torvalds * functions simpler to write. 15851da177e4SLinus Torvalds */ 15861da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 15871da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 15881da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 15891da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 15901da177e4SLinus Torvalds 15911da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 15921da177e4SLinus Torvalds * out on the network. 15931da177e4SLinus Torvalds */ 1594af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1595af997d8cSArnaldo Carvalho de Melo if (!retval) 1596af997d8cSArnaldo Carvalho de Melo goto nodata; 1597af997d8cSArnaldo Carvalho de Melo 15981da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 15991da177e4SLinus Torvalds 16001da177e4SLinus Torvalds /* Set up the parameter header. */ 16011da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16021da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16031da177e4SLinus Torvalds 16041da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16051da177e4SLinus Torvalds cookie->c = asoc->c; 16061da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16071da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16081da177e4SLinus Torvalds 16091da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16101da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16111da177e4SLinus Torvalds 16120f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16130f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16141da177e4SLinus Torvalds 16151da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 16161da177e4SLinus Torvalds do_gettimeofday(&cookie->c.expiration); 16171da177e4SLinus Torvalds TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration); 16181da177e4SLinus Torvalds 16191da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16201da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16211da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16221da177e4SLinus Torvalds 16231da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16241da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16251da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16261da177e4SLinus Torvalds 16271da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16281b489e11SHerbert Xu struct hash_desc desc; 16291b489e11SHerbert Xu 16301da177e4SLinus Torvalds /* Sign the message. */ 163168e3f5ddSHerbert Xu sg_init_one(&sg, &cookie->c, bodysize); 16321da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 16331da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 16341b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 16351b489e11SHerbert Xu desc.flags = 0; 16361da177e4SLinus Torvalds 16371b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 16381b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) 16391b489e11SHerbert Xu goto free_cookie; 16401da177e4SLinus Torvalds } 16411da177e4SLinus Torvalds 16421da177e4SLinus Torvalds return retval; 16431b489e11SHerbert Xu 16441b489e11SHerbert Xu free_cookie: 16451b489e11SHerbert Xu kfree(retval); 16461b489e11SHerbert Xu nodata: 16471b489e11SHerbert Xu *cookie_len = 0; 16481b489e11SHerbert Xu return NULL; 16491da177e4SLinus Torvalds } 16501da177e4SLinus Torvalds 16511da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 16521da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 16531da177e4SLinus Torvalds const struct sctp_endpoint *ep, 16541da177e4SLinus Torvalds const struct sctp_association *asoc, 1655dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 16561da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 16571da177e4SLinus Torvalds { 16581da177e4SLinus Torvalds struct sctp_association *retval = NULL; 16591da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 16601da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 16611da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1662313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 16631da177e4SLinus Torvalds struct scatterlist sg; 16641da177e4SLinus Torvalds unsigned int keylen, len; 16651da177e4SLinus Torvalds char *key; 16661da177e4SLinus Torvalds sctp_scope_t scope; 16671da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1668a61bbcf2SPatrick McHardy struct timeval tv; 16691b489e11SHerbert Xu struct hash_desc desc; 16701da177e4SLinus Torvalds 16719834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16729834a2bbSVlad Yasevich * any padding. 16739834a2bbSVlad Yasevich */ 16749834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 16759834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16769834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16771da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 16781da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 16791da177e4SLinus Torvalds 16801da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 16811da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 16821da177e4SLinus Torvalds * INIT chunk. 16831da177e4SLinus Torvalds */ 16841da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 16851da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 16861da177e4SLinus Torvalds goto malformed; 16871da177e4SLinus Torvalds 16881da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 16891da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16901da177e4SLinus Torvalds goto malformed; 16911da177e4SLinus Torvalds 16921da177e4SLinus Torvalds /* Process the cookie. */ 16931da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 16941da177e4SLinus Torvalds bear_cookie = &cookie->c; 16951da177e4SLinus Torvalds 16961da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 16971da177e4SLinus Torvalds goto no_hmac; 16981da177e4SLinus Torvalds 16991da177e4SLinus Torvalds /* Check the signature. */ 17001da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 170168e3f5ddSHerbert Xu sg_init_one(&sg, bear_cookie, bodysize); 17021da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 17031b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 17041b489e11SHerbert Xu desc.flags = 0; 17051da177e4SLinus Torvalds 17068ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 17071b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 17081b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 17091b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17101b489e11SHerbert Xu goto fail; 17111b489e11SHerbert Xu } 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17141da177e4SLinus Torvalds /* Try the previous key. */ 17151da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->last_key]; 17168ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 17171b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 17181b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 17191b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17201b489e11SHerbert Xu goto fail; 17211b489e11SHerbert Xu } 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17241da177e4SLinus Torvalds /* Yikes! Still bad signature! */ 17251da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17261da177e4SLinus Torvalds goto fail; 17271da177e4SLinus Torvalds } 17281da177e4SLinus Torvalds } 17291da177e4SLinus Torvalds 17301da177e4SLinus Torvalds no_hmac: 17311da177e4SLinus Torvalds /* IG Section 2.35.2: 17321da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17331da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17341da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17351da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17361da177e4SLinus Torvalds * discarded, 17371da177e4SLinus Torvalds */ 17381da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17391da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17401da177e4SLinus Torvalds goto fail; 17411da177e4SLinus Torvalds } 17421da177e4SLinus Torvalds 17439b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17441da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17451da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17461da177e4SLinus Torvalds goto fail; 17471da177e4SLinus Torvalds } 17481da177e4SLinus Torvalds 17491da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17501da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17511da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1752f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1753f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1754f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1755f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17561da177e4SLinus Torvalds */ 1757f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 1758a61bbcf2SPatrick McHardy skb_get_timestamp(skb, &tv); 1759f236218bSVlad Yasevich else 1760f236218bSVlad Yasevich do_gettimeofday(&tv); 1761f236218bSVlad Yasevich 1762a61bbcf2SPatrick McHardy if (!asoc && tv_lt(bear_cookie->expiration, tv)) { 17631da177e4SLinus Torvalds /* 17641da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 17651da177e4SLinus Torvalds * 17661da177e4SLinus Torvalds * Cause of error 17671da177e4SLinus Torvalds * --------------- 17681da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 17691da177e4SLinus Torvalds * Cookie that has expired. 17701da177e4SLinus Torvalds */ 17711da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17721da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 17731da177e4SLinus Torvalds if (*errp) { 1774a61bbcf2SPatrick McHardy suseconds_t usecs = (tv.tv_sec - 17751da177e4SLinus Torvalds bear_cookie->expiration.tv_sec) * 1000000L + 1776a61bbcf2SPatrick McHardy tv.tv_usec - bear_cookie->expiration.tv_usec; 177734bcca28SAl Viro __be32 n = htonl(usecs); 17781da177e4SLinus Torvalds 17791da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 178000f1c2dfSWei Yongjun sizeof(n)); 178100f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 17821da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 17831da177e4SLinus Torvalds } else 17841da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17851da177e4SLinus Torvalds 17861da177e4SLinus Torvalds goto fail; 17871da177e4SLinus Torvalds } 17881da177e4SLinus Torvalds 17891da177e4SLinus Torvalds /* Make a new base association. */ 17901da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 17911da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 17921da177e4SLinus Torvalds if (!retval) { 17931da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17941da177e4SLinus Torvalds goto fail; 17951da177e4SLinus Torvalds } 17961da177e4SLinus Torvalds 17971da177e4SLinus Torvalds /* Set up our peer's port number. */ 17981da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 17991da177e4SLinus Torvalds 18001da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18011da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18021da177e4SLinus Torvalds 18031da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18041da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18051da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18061da177e4SLinus Torvalds goto fail; 18071da177e4SLinus Torvalds } 18081da177e4SLinus Torvalds 18091da177e4SLinus Torvalds /* Also, add the destination address. */ 18101da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1811f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1812f57d96b2SVlad Yasevich SCTP_ADDR_SRC, GFP_ATOMIC); 18131da177e4SLinus Torvalds } 18141da177e4SLinus Torvalds 18151da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18161da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18171da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 18181da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18191da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18200f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18211da177e4SLinus Torvalds 18221da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18231da177e4SLinus Torvalds return retval; 18241da177e4SLinus Torvalds 18251da177e4SLinus Torvalds fail: 18261da177e4SLinus Torvalds if (retval) 18271da177e4SLinus Torvalds sctp_association_free(retval); 18281da177e4SLinus Torvalds 18291da177e4SLinus Torvalds return NULL; 18301da177e4SLinus Torvalds 18311da177e4SLinus Torvalds malformed: 18321da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18331da177e4SLinus Torvalds * malformed. 18341da177e4SLinus Torvalds */ 18351da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18361da177e4SLinus Torvalds goto fail; 18371da177e4SLinus Torvalds } 18381da177e4SLinus Torvalds 18391da177e4SLinus Torvalds /******************************************************************** 18401da177e4SLinus Torvalds * 3rd Level Abstractions 18411da177e4SLinus Torvalds ********************************************************************/ 18421da177e4SLinus Torvalds 18431da177e4SLinus Torvalds struct __sctp_missing { 18449f81bcd9SAl Viro __be32 num_missing; 18459f81bcd9SAl Viro __be16 type; 1846bc10502dSEric Dumazet } __packed; 18471da177e4SLinus Torvalds 18481da177e4SLinus Torvalds /* 18491da177e4SLinus Torvalds * Report a missing mandatory parameter. 18501da177e4SLinus Torvalds */ 18511da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 18521da177e4SLinus Torvalds sctp_param_t paramtype, 18531da177e4SLinus Torvalds struct sctp_chunk *chunk, 18541da177e4SLinus Torvalds struct sctp_chunk **errp) 18551da177e4SLinus Torvalds { 18561da177e4SLinus Torvalds struct __sctp_missing report; 18571da177e4SLinus Torvalds __u16 len; 18581da177e4SLinus Torvalds 18591da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 18601da177e4SLinus Torvalds 18611da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 18621da177e4SLinus Torvalds * returning multiple unknown parameters. 18631da177e4SLinus Torvalds */ 18641da177e4SLinus Torvalds if (!*errp) 18651da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18661da177e4SLinus Torvalds 18671da177e4SLinus Torvalds if (*errp) { 18681da177e4SLinus Torvalds report.num_missing = htonl(1); 18691da177e4SLinus Torvalds report.type = paramtype; 1870ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 187100f1c2dfSWei Yongjun sizeof(report)); 187200f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 18731da177e4SLinus Torvalds } 18741da177e4SLinus Torvalds 18751da177e4SLinus Torvalds /* Stop processing this chunk. */ 18761da177e4SLinus Torvalds return 0; 18771da177e4SLinus Torvalds } 18781da177e4SLinus Torvalds 18791da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 18801da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 18811da177e4SLinus Torvalds struct sctp_chunk *chunk, 18821da177e4SLinus Torvalds struct sctp_chunk **errp) 18831da177e4SLinus Torvalds { 18841da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 18851da177e4SLinus Torvalds 18861da177e4SLinus Torvalds if (!*errp) 18871da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 18881da177e4SLinus Torvalds 18891da177e4SLinus Torvalds if (*errp) 189000f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 18911da177e4SLinus Torvalds 18921da177e4SLinus Torvalds /* Stop processing this chunk. */ 18931da177e4SLinus Torvalds return 0; 18941da177e4SLinus Torvalds } 18951da177e4SLinus Torvalds 18961da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 18971da177e4SLinus Torvalds struct sctp_paramhdr *param, 18981da177e4SLinus Torvalds const struct sctp_chunk *chunk, 18991da177e4SLinus Torvalds struct sctp_chunk **errp) 19001da177e4SLinus Torvalds { 19017ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19027ab90804SVlad Yasevich * not reported. 19037ab90804SVlad Yasevich */ 19047ab90804SVlad Yasevich if (*errp) 19057ab90804SVlad Yasevich sctp_chunk_free(*errp); 19067ab90804SVlad Yasevich 19071da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1908ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19091da177e4SLinus Torvalds 19101da177e4SLinus Torvalds return 0; 19111da177e4SLinus Torvalds } 19121da177e4SLinus Torvalds 19131da177e4SLinus Torvalds 19141da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19151da177e4SLinus Torvalds * send back an indicator to the peer. 19161da177e4SLinus Torvalds */ 19171da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19181da177e4SLinus Torvalds union sctp_params param, 19191da177e4SLinus Torvalds struct sctp_chunk *chunk, 19201da177e4SLinus Torvalds struct sctp_chunk **errp) 19211da177e4SLinus Torvalds { 19221da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19231da177e4SLinus Torvalds 19247ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19257ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19267ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19277ab90804SVlad Yasevich * them in the ABORT. 19287ab90804SVlad Yasevich */ 19297ab90804SVlad Yasevich if (*errp) 19307ab90804SVlad Yasevich sctp_chunk_free(*errp); 19317ab90804SVlad Yasevich 19321da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19331da177e4SLinus Torvalds 193400f1c2dfSWei Yongjun if (*errp) { 193500f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 193600f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 193700f1c2dfSWei Yongjun } 19381da177e4SLinus Torvalds 19391da177e4SLinus Torvalds /* Stop processing this chunk. */ 19401da177e4SLinus Torvalds return 0; 19411da177e4SLinus Torvalds } 19421da177e4SLinus Torvalds 1943f53b5b09SEric W. Biederman static int sctp_verify_ext_param(struct net *net, union sctp_params param) 1944d6701191SVlad Yasevich { 1945d6701191SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1946d6701191SVlad Yasevich int have_auth = 0; 1947d6701191SVlad Yasevich int have_asconf = 0; 1948d6701191SVlad Yasevich int i; 1949d6701191SVlad Yasevich 1950d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1951d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1952d6701191SVlad Yasevich case SCTP_CID_AUTH: 1953d6701191SVlad Yasevich have_auth = 1; 1954d6701191SVlad Yasevich break; 1955d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1956d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1957d6701191SVlad Yasevich have_asconf = 1; 1958d6701191SVlad Yasevich break; 1959d6701191SVlad Yasevich } 1960d6701191SVlad Yasevich } 1961d6701191SVlad Yasevich 1962d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1963d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 1964d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 1965d6701191SVlad Yasevich * mode. 1966d6701191SVlad Yasevich */ 1967d6701191SVlad Yasevich if (sctp_addip_noauth) 1968d6701191SVlad Yasevich return 1; 1969d6701191SVlad Yasevich 1970d6701191SVlad Yasevich if (sctp_addip_enable && !have_auth && have_asconf) 1971d6701191SVlad Yasevich return 0; 1972d6701191SVlad Yasevich 1973d6701191SVlad Yasevich return 1; 1974d6701191SVlad Yasevich } 1975d6701191SVlad Yasevich 1976131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 1977131a47e3SVlad Yasevich union sctp_params param) 1978131a47e3SVlad Yasevich { 1979131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1980131a47e3SVlad Yasevich int i; 1981131a47e3SVlad Yasevich 1982131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 1983131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 1984131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 1985131a47e3SVlad Yasevich if (sctp_prsctp_enable && 1986131a47e3SVlad Yasevich !asoc->peer.prsctp_capable) 1987131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 1988131a47e3SVlad Yasevich break; 1989730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 1990730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 1991730fc3d0SVlad Yasevich * supports AUTH. 1992730fc3d0SVlad Yasevich */ 19930ef46e28SVlad Yasevich if (sctp_auth_enable) 1994730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 1995730fc3d0SVlad Yasevich break; 1996131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 1997131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 19980ef46e28SVlad Yasevich if (sctp_addip_enable) 199988799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20006b2f9cb6SVlad Yasevich break; 2001131a47e3SVlad Yasevich default: 2002131a47e3SVlad Yasevich break; 2003131a47e3SVlad Yasevich } 2004131a47e3SVlad Yasevich } 2005131a47e3SVlad Yasevich } 2006131a47e3SVlad Yasevich 20071da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20081da177e4SLinus Torvalds * 20091da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20101da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20111da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20121da177e4SLinus Torvalds * Parameter Type. 20131da177e4SLinus Torvalds * 20147ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20157ab90804SVlad Yasevich * parameters within this chunk 20161da177e4SLinus Torvalds * 20177ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20187ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20197ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20201da177e4SLinus Torvalds * 20211da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20221da177e4SLinus Torvalds * 20231da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20241da177e4SLinus Torvalds * report the unrecognized parameter in an 20257ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20261da177e4SLinus Torvalds * 20271da177e4SLinus Torvalds * Return value: 20287ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20297ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20307ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20311da177e4SLinus Torvalds */ 20327ab90804SVlad Yasevich static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, 20331da177e4SLinus Torvalds union sctp_params param, 20341da177e4SLinus Torvalds struct sctp_chunk *chunk, 20351da177e4SLinus Torvalds struct sctp_chunk **errp) 20361da177e4SLinus Torvalds { 20377ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20381da177e4SLinus Torvalds 20391da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20401da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20417ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20421da177e4SLinus Torvalds break; 20431da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20441da177e4SLinus Torvalds break; 20457ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20467ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20477ab90804SVlad Yasevich /* Fall through */ 20481da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20491da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20501da177e4SLinus Torvalds * returning multiple unknown parameters. 20511da177e4SLinus Torvalds */ 20521da177e4SLinus Torvalds if (NULL == *errp) 20535fa782c2SNeil Horman *errp = sctp_make_op_error_fixed(asoc, chunk); 20541da177e4SLinus Torvalds 20551da177e4SLinus Torvalds if (*errp) { 20562205a6eaSJiri Bohac if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, 20572205a6eaSJiri Bohac WORD_ROUND(ntohs(param.p->length)))) 20585fa782c2SNeil Horman sctp_addto_chunk_fixed(*errp, 205900f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 206000f1c2dfSWei Yongjun param.v); 20611da177e4SLinus Torvalds } else { 20621da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 20631da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 20641da177e4SLinus Torvalds * to the peer and the association won't be 20651da177e4SLinus Torvalds * established. 20661da177e4SLinus Torvalds */ 20677ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 20681da177e4SLinus Torvalds } 20691da177e4SLinus Torvalds break; 20701da177e4SLinus Torvalds default: 20711da177e4SLinus Torvalds break; 20721da177e4SLinus Torvalds } 20731da177e4SLinus Torvalds 20741da177e4SLinus Torvalds return retval; 20751da177e4SLinus Torvalds } 20761da177e4SLinus Torvalds 20777ab90804SVlad Yasevich /* Verify variable length parameters 20781da177e4SLinus Torvalds * Return values: 20797ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 20807ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 20817ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 20827ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20831da177e4SLinus Torvalds */ 2084f53b5b09SEric W. Biederman static sctp_ierror_t sctp_verify_param(struct net *net, 2085f53b5b09SEric W. Biederman const struct sctp_association *asoc, 20861da177e4SLinus Torvalds union sctp_params param, 20871da177e4SLinus Torvalds sctp_cid_t cid, 20881da177e4SLinus Torvalds struct sctp_chunk *chunk, 20891da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 20901da177e4SLinus Torvalds { 209172da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 20927ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 209372da7b38SWei Yongjun __u16 n_elt, id = 0; 209472da7b38SWei Yongjun int i; 20951da177e4SLinus Torvalds 20961da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 20971da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 20981da177e4SLinus Torvalds * identified based on the chunk id. 20991da177e4SLinus Torvalds */ 21001da177e4SLinus Torvalds 21011da177e4SLinus Torvalds switch (param.p->type) { 21021da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21031da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21041da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21051da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21061da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21071da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21081da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21091da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21100f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2111d6701191SVlad Yasevich break; 2112d6701191SVlad Yasevich 2113131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2114f53b5b09SEric W. Biederman if (!sctp_verify_ext_param(net, param)) 2115d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21161da177e4SLinus Torvalds break; 21171da177e4SLinus Torvalds 2118d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2119d6de3097SVlad Yasevich if (sctp_addip_enable) 2120d6de3097SVlad Yasevich break; 2121d6de3097SVlad Yasevich goto fallthrough; 2122d6de3097SVlad Yasevich 21231da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21241da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21257ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21267ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21277ab90804SVlad Yasevich break; 2128131a47e3SVlad Yasevich 21291da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 21301da177e4SLinus Torvalds if (sctp_prsctp_enable) 21311da177e4SLinus Torvalds break; 2132730fc3d0SVlad Yasevich goto fallthrough; 2133730fc3d0SVlad Yasevich 2134730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2135730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2136730fc3d0SVlad Yasevich goto fallthrough; 2137730fc3d0SVlad Yasevich 2138730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2139730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2140730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2141730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2142730fc3d0SVlad Yasevich */ 2143730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 21447ab90804SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { 21457ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2146730fc3d0SVlad Yasevich chunk, err_chunk); 21477ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21487ab90804SVlad Yasevich } 2149730fc3d0SVlad Yasevich break; 2150730fc3d0SVlad Yasevich 2151730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2152730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2153730fc3d0SVlad Yasevich goto fallthrough; 2154730fc3d0SVlad Yasevich 2155730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2156730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2157730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2158730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2159730fc3d0SVlad Yasevich */ 21607ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 21617ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2162730fc3d0SVlad Yasevich chunk, err_chunk); 21637ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21647ab90804SVlad Yasevich } 2165730fc3d0SVlad Yasevich break; 2166730fc3d0SVlad Yasevich 2167730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 216872da7b38SWei Yongjun if (!sctp_auth_enable) 216972da7b38SWei Yongjun goto fallthrough; 217072da7b38SWei Yongjun 217172da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 217272da7b38SWei Yongjun n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; 217372da7b38SWei Yongjun 217472da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 217572da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 217672da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 217772da7b38SWei Yongjun */ 217872da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 217972da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 218072da7b38SWei Yongjun 218172da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2182730fc3d0SVlad Yasevich break; 218372da7b38SWei Yongjun } 218472da7b38SWei Yongjun 218572da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 218672da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 218772da7b38SWei Yongjun err_chunk); 218872da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 218972da7b38SWei Yongjun } 219072da7b38SWei Yongjun break; 2191730fc3d0SVlad Yasevich fallthrough: 21921da177e4SLinus Torvalds default: 21931da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n", 21941da177e4SLinus Torvalds ntohs(param.p->type), cid); 21957ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 21961da177e4SLinus Torvalds break; 21971da177e4SLinus Torvalds } 21981da177e4SLinus Torvalds return retval; 21991da177e4SLinus Torvalds } 22001da177e4SLinus Torvalds 22011da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2202f53b5b09SEric W. Biederman int sctp_verify_init(struct net *net, const struct sctp_association *asoc, 22031da177e4SLinus Torvalds sctp_cid_t cid, 22041da177e4SLinus Torvalds sctp_init_chunk_t *peer_init, 22051da177e4SLinus Torvalds struct sctp_chunk *chunk, 22061da177e4SLinus Torvalds struct sctp_chunk **errp) 22071da177e4SLinus Torvalds { 22081da177e4SLinus Torvalds union sctp_params param; 22091da177e4SLinus Torvalds int has_cookie = 0; 22107ab90804SVlad Yasevich int result; 22111da177e4SLinus Torvalds 22121da177e4SLinus Torvalds /* Verify stream values are non-zero. */ 22131da177e4SLinus Torvalds if ((0 == peer_init->init_hdr.num_outbound_streams) || 2214d023f629SVlad Yasevich (0 == peer_init->init_hdr.num_inbound_streams) || 2215d023f629SVlad Yasevich (0 == peer_init->init_hdr.init_tag) || 2216d023f629SVlad Yasevich (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) { 22171da177e4SLinus Torvalds 22187ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22191da177e4SLinus Torvalds } 22201da177e4SLinus Torvalds 22211da177e4SLinus Torvalds /* Check for missing mandatory parameters. */ 22221da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22231da177e4SLinus Torvalds 22241da177e4SLinus Torvalds if (SCTP_PARAM_STATE_COOKIE == param.p->type) 22251da177e4SLinus Torvalds has_cookie = 1; 22261da177e4SLinus Torvalds 22271da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22281da177e4SLinus Torvalds 22291da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22301da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22311da177e4SLinus Torvalds * The current param.p would point at the bad one. 22321da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22331da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22341da177e4SLinus Torvalds * error handling code build and send the packet. 22351da177e4SLinus Torvalds */ 22367ab90804SVlad Yasevich if (param.v != (void*)chunk->chunk_end) 22377ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22381da177e4SLinus Torvalds 22391da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22401da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22411da177e4SLinus Torvalds */ 22427ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22437ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22441da177e4SLinus Torvalds chunk, errp); 22451da177e4SLinus Torvalds 22467ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22471da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22481da177e4SLinus Torvalds 2249f53b5b09SEric W. Biederman result = sctp_verify_param(net, asoc, param, cid, chunk, errp); 22507ab90804SVlad Yasevich switch (result) { 22517ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22527ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22531da177e4SLinus Torvalds return 0; 22547ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 22551da177e4SLinus Torvalds return 1; 22567ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 22577ab90804SVlad Yasevich default: 22587ab90804SVlad Yasevich break; 22591da177e4SLinus Torvalds } 22601da177e4SLinus Torvalds 22611da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22621da177e4SLinus Torvalds 22631da177e4SLinus Torvalds return 1; 22641da177e4SLinus Torvalds } 22651da177e4SLinus Torvalds 22661da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 22671da177e4SLinus Torvalds * Returns 0 on failure, else success. 22681da177e4SLinus Torvalds * FIXME: This is an association method. 22691da177e4SLinus Torvalds */ 2270de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 22711da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2272dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 22731da177e4SLinus Torvalds { 22741da177e4SLinus Torvalds union sctp_params param; 22751da177e4SLinus Torvalds struct sctp_transport *transport; 22761da177e4SLinus Torvalds struct list_head *pos, *temp; 2277de6becdcSWei Yongjun struct sctp_af *af; 2278de6becdcSWei Yongjun union sctp_addr addr; 22791da177e4SLinus Torvalds char *cookie; 2280de6becdcSWei Yongjun int src_match = 0; 22811da177e4SLinus Torvalds 22821da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 22831da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 22841da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 22851da177e4SLinus Torvalds * of the INIT from the cookie. 22861da177e4SLinus Torvalds */ 22871da177e4SLinus Torvalds 22881da177e4SLinus Torvalds /* This implementation defaults to making the first transport 22891da177e4SLinus Torvalds * added as the primary transport. The source address seems to 22901da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 22911da177e4SLinus Torvalds */ 22926a1e5f33SAl Viro if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 22931da177e4SLinus Torvalds goto nomem; 2294de6becdcSWei Yongjun 2295de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2296de6becdcSWei Yongjun src_match = 1; 22971da177e4SLinus Torvalds 22981da177e4SLinus Torvalds /* Process the initialization parameters. */ 22991da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2300de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2301de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2302de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2303de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2304de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2305de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2306de6becdcSWei Yongjun src_match = 1; 2307de6becdcSWei Yongjun } 23081da177e4SLinus Torvalds 23091da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23101da177e4SLinus Torvalds goto clean_up; 23111da177e4SLinus Torvalds } 23121da177e4SLinus Torvalds 2313de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2314de6becdcSWei Yongjun if (!src_match) 2315de6becdcSWei Yongjun goto clean_up; 2316de6becdcSWei Yongjun 2317730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2318730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2319730fc3d0SVlad Yasevich */ 2320730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2321730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2322730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2323730fc3d0SVlad Yasevich 2324d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2325d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2326d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2327d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2328d6701191SVlad Yasevich * is what we'll do here. 23296b2f9cb6SVlad Yasevich */ 233073d9c4fdSVlad Yasevich if (!sctp_addip_noauth && 233173d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23326b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23336b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23346b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 233588799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2336d6701191SVlad Yasevich goto clean_up; 23376b2f9cb6SVlad Yasevich } 23386b2f9cb6SVlad Yasevich 23393f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23403f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23413f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23423f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23433f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23443f7a87d2SFrank Filz } 23453f7a87d2SFrank Filz } 23463f7a87d2SFrank Filz 23471da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23481da177e4SLinus Torvalds * order. 23491da177e4SLinus Torvalds */ 23501da177e4SLinus Torvalds asoc->peer.i.init_tag = 23511da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23521da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 23531da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 23541da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 23551da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23561da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 23571da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23581da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 23591da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 23601da177e4SLinus Torvalds 23611da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 23621da177e4SLinus Torvalds * number of inbound streams. 23631da177e4SLinus Torvalds */ 23641da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 23651da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 23661da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 23671da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23681da177e4SLinus Torvalds } 23691da177e4SLinus Torvalds 23701da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 23711da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 23721da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 23731da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23741da177e4SLinus Torvalds } 23751da177e4SLinus Torvalds 23761da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 23771da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 23781da177e4SLinus Torvalds 23791da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 23801da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 23811da177e4SLinus Torvalds 23821da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 23831da177e4SLinus Torvalds cookie = asoc->peer.cookie; 23841da177e4SLinus Torvalds if (cookie) { 2385af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 23861da177e4SLinus Torvalds if (!asoc->peer.cookie) 23871da177e4SLinus Torvalds goto clean_up; 23881da177e4SLinus Torvalds } 23891da177e4SLinus Torvalds 23901da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 23911da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 23921da177e4SLinus Torvalds * advertised window). 23931da177e4SLinus Torvalds */ 23949dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 23959dbc15f0SRobert P. J. Day transports) { 23961da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 23971da177e4SLinus Torvalds } 23981da177e4SLinus Torvalds 23991da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24008e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24018e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24028e1ee18cSVlad Yasevich goto clean_up; 24031da177e4SLinus Torvalds 24041da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24051da177e4SLinus Torvalds * 24061da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24071da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24081da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24091da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24101da177e4SLinus Torvalds */ 24111da177e4SLinus Torvalds 24123f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 24133f7a87d2SFrank Filz * association. 24141da177e4SLinus Torvalds */ 24151da177e4SLinus Torvalds if (!asoc->temp) { 24161da177e4SLinus Torvalds int error; 24171da177e4SLinus Torvalds 24181da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 24191da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 24201da177e4SLinus Torvalds if (!asoc->ssnmap) 24211da177e4SLinus Torvalds goto clean_up; 24221da177e4SLinus Torvalds 242307d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 242407d93967SVlad Yasevich if (error) 24251da177e4SLinus Torvalds goto clean_up; 24261da177e4SLinus Torvalds } 24271da177e4SLinus Torvalds 24281da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24291da177e4SLinus Torvalds * 24301da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24311da177e4SLinus Torvalds * remote endpoint it should do the following: 24321da177e4SLinus Torvalds * ... 24331da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24341da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24351da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24361da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24371da177e4SLinus Torvalds */ 24381da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24391da177e4SLinus Torvalds return 1; 24401da177e4SLinus Torvalds 24411da177e4SLinus Torvalds clean_up: 24421da177e4SLinus Torvalds /* Release the transport structures. */ 24431da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24441da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2445add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2446add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24471da177e4SLinus Torvalds } 24483f7a87d2SFrank Filz 24491da177e4SLinus Torvalds nomem: 24501da177e4SLinus Torvalds return 0; 24511da177e4SLinus Torvalds } 24521da177e4SLinus Torvalds 24531da177e4SLinus Torvalds 24541da177e4SLinus Torvalds /* Update asoc with the option described in param. 24551da177e4SLinus Torvalds * 24561da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 24571da177e4SLinus Torvalds * 24581da177e4SLinus Torvalds * asoc is the association to update. 24591da177e4SLinus Torvalds * param is the variable length parameter to use for update. 24601da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 24611da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 24621da177e4SLinus Torvalds * work we do. In particular, we should not build transport 24631da177e4SLinus Torvalds * structures for the addresses. 24641da177e4SLinus Torvalds */ 24651da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 24661da177e4SLinus Torvalds union sctp_params param, 24671da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2468dd0fc66fSAl Viro gfp_t gfp) 24691da177e4SLinus Torvalds { 2470e7ff4a70SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 24711da177e4SLinus Torvalds union sctp_addr addr; 24721da177e4SLinus Torvalds int i; 24731da177e4SLinus Torvalds __u16 sat; 24741da177e4SLinus Torvalds int retval = 1; 24751da177e4SLinus Torvalds sctp_scope_t scope; 24761da177e4SLinus Torvalds time_t stale; 24771da177e4SLinus Torvalds struct sctp_af *af; 2478d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2479d6de3097SVlad Yasevich struct sctp_transport *t; 24801da177e4SLinus Torvalds 24811da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 24821da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 24831da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 24841da177e4SLinus Torvalds */ 24851da177e4SLinus Torvalds switch (param.p->type) { 24861da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 24871da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 24881da177e4SLinus Torvalds break; 24897dab83deSVlad Yasevich goto do_addr_param; 24907dab83deSVlad Yasevich 24911da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 24927dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 24937dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 24947dab83deSVlad Yasevich break; 24957dab83deSVlad Yasevich do_addr_param: 24961da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2497dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 24981da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2499e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2500dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25011da177e4SLinus Torvalds return 0; 25021da177e4SLinus Torvalds break; 25031da177e4SLinus Torvalds 25041da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 25051da177e4SLinus Torvalds if (!sctp_cookie_preserve_enable) 25061da177e4SLinus Torvalds break; 25071da177e4SLinus Torvalds 25081da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25091da177e4SLinus Torvalds 25101da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25111da177e4SLinus Torvalds * (1/1000sec). 25121da177e4SLinus Torvalds */ 25131da177e4SLinus Torvalds asoc->cookie_life.tv_sec += stale / 1000; 25141da177e4SLinus Torvalds asoc->cookie_life.tv_usec += (stale % 1000) * 1000; 25151da177e4SLinus Torvalds break; 25161da177e4SLinus Torvalds 25171da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25181da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n"); 25191da177e4SLinus Torvalds break; 25201da177e4SLinus Torvalds 25211da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25221da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25231da177e4SLinus Torvalds * ones are really set by the peer. 25241da177e4SLinus Torvalds */ 25251da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25261da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25271da177e4SLinus Torvalds 2528140ee960SGui Jianfeng /* Assume that peer supports the address family 2529140ee960SGui Jianfeng * by which it sends a packet. 2530140ee960SGui Jianfeng */ 2531140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2532140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2533140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2534140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2535140ee960SGui Jianfeng 25361da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25371da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25381da177e4SLinus Torvalds if (sat) 25391da177e4SLinus Torvalds sat /= sizeof(__u16); 25401da177e4SLinus Torvalds 25411da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25421da177e4SLinus Torvalds switch (param.sat->types[i]) { 25431da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25441da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25451da177e4SLinus Torvalds break; 25461da177e4SLinus Torvalds 25471da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25486e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25491da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25501da177e4SLinus Torvalds break; 25511da177e4SLinus Torvalds 25521da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25531da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25541da177e4SLinus Torvalds break; 25551da177e4SLinus Torvalds 25561da177e4SLinus Torvalds default: /* Just ignore anything else. */ 25571da177e4SLinus Torvalds break; 25583ff50b79SStephen Hemminger } 25591da177e4SLinus Torvalds } 25601da177e4SLinus Torvalds break; 25611da177e4SLinus Torvalds 25621da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 25631da177e4SLinus Torvalds asoc->peer.cookie_len = 25641da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25651da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 25661da177e4SLinus Torvalds break; 25671da177e4SLinus Torvalds 25681da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 25691da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 25701da177e4SLinus Torvalds break; 25711da177e4SLinus Torvalds 25721da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 25731da177e4SLinus Torvalds /* Rejected during verify stage. */ 25741da177e4SLinus Torvalds break; 25751da177e4SLinus Torvalds 25761da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 25771da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 25781da177e4SLinus Torvalds break; 25791da177e4SLinus Torvalds 25800f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2581e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 25821da177e4SLinus Torvalds break; 25831da177e4SLinus Torvalds 2584d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 25850ef46e28SVlad Yasevich if (!sctp_addip_enable) 25860ef46e28SVlad Yasevich goto fall_through; 25870ef46e28SVlad Yasevich 2588d6de3097SVlad Yasevich addr_param = param.v + sizeof(sctp_addip_param_t); 2589d6de3097SVlad Yasevich 2590d6de3097SVlad Yasevich af = sctp_get_af_specific(param_type2af(param.p->type)); 2591d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2592d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2593d6de3097SVlad Yasevich 2594d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2595d6de3097SVlad Yasevich * XXX: see spec for what to do. 2596d6de3097SVlad Yasevich */ 2597d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2598d6de3097SVlad Yasevich break; 2599d6de3097SVlad Yasevich 2600d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2601d6de3097SVlad Yasevich if (!t) 2602d6de3097SVlad Yasevich break; 2603d6de3097SVlad Yasevich 2604d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2605d6de3097SVlad Yasevich break; 2606d6de3097SVlad Yasevich 2607131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2608131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2609131a47e3SVlad Yasevich break; 2610131a47e3SVlad Yasevich 26111da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 26121da177e4SLinus Torvalds if (sctp_prsctp_enable) { 26131da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26141da177e4SLinus Torvalds break; 26151da177e4SLinus Torvalds } 26161da177e4SLinus Torvalds /* Fall Through */ 2617730fc3d0SVlad Yasevich goto fall_through; 2618730fc3d0SVlad Yasevich 2619730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2620730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2621730fc3d0SVlad Yasevich goto fall_through; 2622730fc3d0SVlad Yasevich 2623730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2624730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2625730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2626730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2627730fc3d0SVlad Yasevich retval = 0; 2628730fc3d0SVlad Yasevich break; 2629730fc3d0SVlad Yasevich } 2630730fc3d0SVlad Yasevich break; 2631730fc3d0SVlad Yasevich 2632730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2633730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2634730fc3d0SVlad Yasevich goto fall_through; 2635730fc3d0SVlad Yasevich 2636730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2637730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2638730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2639730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2640730fc3d0SVlad Yasevich retval = 0; 2641730fc3d0SVlad Yasevich break; 2642730fc3d0SVlad Yasevich } 2643730fc3d0SVlad Yasevich 2644730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2645730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2646730fc3d0SVlad Yasevich break; 2647730fc3d0SVlad Yasevich 2648730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2649730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2650730fc3d0SVlad Yasevich goto fall_through; 2651730fc3d0SVlad Yasevich 2652730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2653730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2654730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2655730fc3d0SVlad Yasevich retval = 0; 2656730fc3d0SVlad Yasevich break; 2657730fc3d0SVlad Yasevich fall_through: 26581da177e4SLinus Torvalds default: 26591da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 26601da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 26611da177e4SLinus Torvalds * called prior to this routine. Simply log the error 26621da177e4SLinus Torvalds * here. 26631da177e4SLinus Torvalds */ 26641da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n", 26651da177e4SLinus Torvalds ntohs(param.p->type), asoc); 26661da177e4SLinus Torvalds break; 26673ff50b79SStephen Hemminger } 26681da177e4SLinus Torvalds 26691da177e4SLinus Torvalds return retval; 26701da177e4SLinus Torvalds } 26711da177e4SLinus Torvalds 26721da177e4SLinus Torvalds /* Select a new verification tag. */ 26731da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 26741da177e4SLinus Torvalds { 26751da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 26761da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 26771da177e4SLinus Torvalds */ 26781da177e4SLinus Torvalds __u32 x; 26791da177e4SLinus Torvalds 26801da177e4SLinus Torvalds do { 26811da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 26821da177e4SLinus Torvalds } while (x == 0); 26831da177e4SLinus Torvalds 26841da177e4SLinus Torvalds return x; 26851da177e4SLinus Torvalds } 26861da177e4SLinus Torvalds 26871da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 26881da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 26891da177e4SLinus Torvalds { 26901da177e4SLinus Torvalds __u32 retval; 26911da177e4SLinus Torvalds 26921da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 26931da177e4SLinus Torvalds return retval; 26941da177e4SLinus Torvalds } 26951da177e4SLinus Torvalds 26961da177e4SLinus Torvalds /* 26971da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 26981da177e4SLinus Torvalds * 0 1 2 3 26991da177e4SLinus 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 27001da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27011da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27021da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27031da177e4SLinus Torvalds * | Serial Number | 27041da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27051da177e4SLinus Torvalds * | Address Parameter | 27061da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27071da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27081da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27091da177e4SLinus Torvalds * \ \ 27101da177e4SLinus Torvalds * / .... / 27111da177e4SLinus Torvalds * \ \ 27121da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27131da177e4SLinus Torvalds * | ASCONF Parameter #N | 27141da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27151da177e4SLinus Torvalds * 27161da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27171da177e4SLinus Torvalds */ 27181da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27191da177e4SLinus Torvalds union sctp_addr *addr, 27201da177e4SLinus Torvalds int vparam_len) 27211da177e4SLinus Torvalds { 27221da177e4SLinus Torvalds sctp_addiphdr_t asconf; 27231da177e4SLinus Torvalds struct sctp_chunk *retval; 27241da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27251da177e4SLinus Torvalds union sctp_addr_param addrparam; 27261da177e4SLinus Torvalds int addrlen; 27271da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27281da177e4SLinus Torvalds 27291da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27301da177e4SLinus Torvalds if (!addrlen) 27311da177e4SLinus Torvalds return NULL; 27321da177e4SLinus Torvalds length += addrlen; 27331da177e4SLinus Torvalds 27341da177e4SLinus Torvalds /* Create the chunk. */ 27351da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length); 27361da177e4SLinus Torvalds if (!retval) 27371da177e4SLinus Torvalds return NULL; 27381da177e4SLinus Torvalds 27391da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27401da177e4SLinus Torvalds 27411da177e4SLinus Torvalds retval->subh.addip_hdr = 27421da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27431da177e4SLinus Torvalds retval->param_hdr.v = 27441da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27451da177e4SLinus Torvalds 27461da177e4SLinus Torvalds return retval; 27471da177e4SLinus Torvalds } 27481da177e4SLinus Torvalds 27491da177e4SLinus Torvalds /* ADDIP 27501da177e4SLinus Torvalds * 3.2.1 Add IP Address 27511da177e4SLinus Torvalds * 0 1 2 3 27521da177e4SLinus 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 27531da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27541da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 27551da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27561da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27571da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27581da177e4SLinus Torvalds * | Address Parameter | 27591da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27601da177e4SLinus Torvalds * 27611da177e4SLinus Torvalds * 3.2.2 Delete IP Address 27621da177e4SLinus Torvalds * 0 1 2 3 27631da177e4SLinus 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 27641da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27651da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 27661da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27671da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27681da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27691da177e4SLinus Torvalds * | Address Parameter | 27701da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27711da177e4SLinus Torvalds * 27721da177e4SLinus Torvalds */ 27731da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 27741da177e4SLinus Torvalds union sctp_addr *laddr, 27751da177e4SLinus Torvalds struct sockaddr *addrs, 27761da177e4SLinus Torvalds int addrcnt, 2777dbc16db1SAl Viro __be16 flags) 27781da177e4SLinus Torvalds { 27791da177e4SLinus Torvalds sctp_addip_param_t param; 27801da177e4SLinus Torvalds struct sctp_chunk *retval; 27811da177e4SLinus Torvalds union sctp_addr_param addr_param; 27821da177e4SLinus Torvalds union sctp_addr *addr; 27831da177e4SLinus Torvalds void *addr_buf; 27841da177e4SLinus Torvalds struct sctp_af *af; 27851da177e4SLinus Torvalds int paramlen = sizeof(param); 27861da177e4SLinus Torvalds int addr_param_len = 0; 27871da177e4SLinus Torvalds int totallen = 0; 27881da177e4SLinus Torvalds int i; 27898a07eb0aSMichio Honda int del_pickup = 0; 27901da177e4SLinus Torvalds 27911da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 27921da177e4SLinus Torvalds addr_buf = addrs; 27931da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2794ea110733SJoe Perches addr = addr_buf; 27951da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 27961da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 27971da177e4SLinus Torvalds 27981da177e4SLinus Torvalds totallen += paramlen; 27991da177e4SLinus Torvalds totallen += addr_param_len; 28001da177e4SLinus Torvalds 28011da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28028a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28038a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28048a07eb0aSMichio Honda totallen += paramlen; 28058a07eb0aSMichio Honda totallen += addr_param_len; 28068a07eb0aSMichio Honda del_pickup = 1; 28078a07eb0aSMichio Honda SCTP_DEBUG_PRINTK("mkasconf_update_ip: picked same-scope del_pending addr, totallen for all addresses is %d\n", totallen); 28088a07eb0aSMichio Honda } 28091da177e4SLinus Torvalds } 28101da177e4SLinus Torvalds 28111da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28121da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28131da177e4SLinus Torvalds if (!retval) 28141da177e4SLinus Torvalds return NULL; 28151da177e4SLinus Torvalds 28161da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28171da177e4SLinus Torvalds addr_buf = addrs; 28181da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2819ea110733SJoe Perches addr = addr_buf; 28201da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28211da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28221da177e4SLinus Torvalds param.param_hdr.type = flags; 28231da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 28241da177e4SLinus Torvalds param.crr_id = i; 28251da177e4SLinus Torvalds 28261da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28271da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28281da177e4SLinus Torvalds 28291da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28301da177e4SLinus Torvalds } 28318a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28328a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28338a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28348a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28358a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28368a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 28378a07eb0aSMichio Honda param.crr_id = i; 28388a07eb0aSMichio Honda 28398a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28408a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28418a07eb0aSMichio Honda } 28421da177e4SLinus Torvalds return retval; 28431da177e4SLinus Torvalds } 28441da177e4SLinus Torvalds 28451da177e4SLinus Torvalds /* ADDIP 28461da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 28471da177e4SLinus Torvalds * 0 1 2 3 28481da177e4SLinus 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 28491da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28501da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 28511da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28521da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28531da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28541da177e4SLinus Torvalds * | Address Parameter | 28551da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28561da177e4SLinus Torvalds * 28571da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 28581da177e4SLinus Torvalds */ 28591da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 28601da177e4SLinus Torvalds union sctp_addr *addr) 28611da177e4SLinus Torvalds { 28621da177e4SLinus Torvalds sctp_addip_param_t param; 28631da177e4SLinus Torvalds struct sctp_chunk *retval; 28641da177e4SLinus Torvalds int len = sizeof(param); 28651da177e4SLinus Torvalds union sctp_addr_param addrparam; 28661da177e4SLinus Torvalds int addrlen; 28671da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 28681da177e4SLinus Torvalds 28691da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 28701da177e4SLinus Torvalds if (!addrlen) 28711da177e4SLinus Torvalds return NULL; 28721da177e4SLinus Torvalds len += addrlen; 28731da177e4SLinus Torvalds 28741da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 28751da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 28761da177e4SLinus Torvalds if (!retval) 28771da177e4SLinus Torvalds return NULL; 28781da177e4SLinus Torvalds 28791da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 28801da177e4SLinus Torvalds param.param_hdr.length = htons(len); 28811da177e4SLinus Torvalds param.crr_id = 0; 28821da177e4SLinus Torvalds 28831da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 28841da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 28851da177e4SLinus Torvalds 28861da177e4SLinus Torvalds return retval; 28871da177e4SLinus Torvalds } 28881da177e4SLinus Torvalds 28891da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 28901da177e4SLinus Torvalds * 0 1 2 3 28911da177e4SLinus 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 28921da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28931da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 28941da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28951da177e4SLinus Torvalds * | Serial Number | 28961da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28971da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 28981da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28991da177e4SLinus Torvalds * \ \ 29001da177e4SLinus Torvalds * / .... / 29011da177e4SLinus Torvalds * \ \ 29021da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29031da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29041da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29051da177e4SLinus Torvalds * 29061da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29071da177e4SLinus Torvalds */ 29081da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29091da177e4SLinus Torvalds __u32 serial, int vparam_len) 29101da177e4SLinus Torvalds { 29111da177e4SLinus Torvalds sctp_addiphdr_t asconf; 29121da177e4SLinus Torvalds struct sctp_chunk *retval; 29131da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29141da177e4SLinus Torvalds 29151da177e4SLinus Torvalds /* Create the chunk. */ 29161da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length); 29171da177e4SLinus Torvalds if (!retval) 29181da177e4SLinus Torvalds return NULL; 29191da177e4SLinus Torvalds 29201da177e4SLinus Torvalds asconf.serial = htonl(serial); 29211da177e4SLinus Torvalds 29221da177e4SLinus Torvalds retval->subh.addip_hdr = 29231da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29241da177e4SLinus Torvalds 29251da177e4SLinus Torvalds return retval; 29261da177e4SLinus Torvalds } 29271da177e4SLinus Torvalds 29281da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29299f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2930dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 29311da177e4SLinus Torvalds { 29321da177e4SLinus Torvalds sctp_addip_param_t ack_param; 29331da177e4SLinus Torvalds sctp_errhdr_t err_param; 29341da177e4SLinus Torvalds int asconf_param_len = 0; 29351da177e4SLinus Torvalds int err_param_len = 0; 2936dbc16db1SAl Viro __be16 response_type; 29371da177e4SLinus Torvalds 29381da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 29391da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 29401da177e4SLinus Torvalds } else { 29411da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 29421da177e4SLinus Torvalds err_param_len = sizeof(err_param); 29431da177e4SLinus Torvalds if (asconf_param) 29441da177e4SLinus Torvalds asconf_param_len = 29451da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 29461da177e4SLinus Torvalds } 29471da177e4SLinus Torvalds 29481da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 29491da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 29501da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 29511da177e4SLinus Torvalds err_param_len + 29521da177e4SLinus Torvalds asconf_param_len); 29531da177e4SLinus Torvalds ack_param.crr_id = crr_id; 29541da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 29551da177e4SLinus Torvalds 29561da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 29571da177e4SLinus Torvalds return; 29581da177e4SLinus Torvalds 29591da177e4SLinus Torvalds /* Add Error Cause parameter. */ 29601da177e4SLinus Torvalds err_param.cause = err_code; 29611da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 29621da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 29631da177e4SLinus Torvalds 29641da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 29651da177e4SLinus Torvalds if (asconf_param) 29661da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 29671da177e4SLinus Torvalds } 29681da177e4SLinus Torvalds 29691da177e4SLinus Torvalds /* Process a asconf parameter. */ 2970dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 29711da177e4SLinus Torvalds struct sctp_chunk *asconf, 29721da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 29731da177e4SLinus Torvalds { 29741da177e4SLinus Torvalds struct sctp_transport *peer; 29751da177e4SLinus Torvalds struct sctp_af *af; 29761da177e4SLinus Torvalds union sctp_addr addr; 29771da177e4SLinus Torvalds union sctp_addr_param *addr_param; 29781da177e4SLinus Torvalds 2979ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 2980c1cc678aSPatrick McHardy 298144e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 298244e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 298344e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 298444e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 298544e65c1eSWei Yongjun 29866a435732SShan Wei switch (addr_param->p.type) { 2987c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 2988c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 2989945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 2990c4492586SWei Yongjun break; 2991c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 2992c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 2993945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 2994c4492586SWei Yongjun break; 2995c4492586SWei Yongjun default: 2996945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 2997c4492586SWei Yongjun } 2998c4492586SWei Yongjun 29996a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30001da177e4SLinus Torvalds if (unlikely(!af)) 3001945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30021da177e4SLinus Torvalds 3003dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 300442e30bf3SVlad Yasevich 300542e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 300642e30bf3SVlad Yasevich * or multicast address. 300742e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 300842e30bf3SVlad Yasevich * make sure we check for that) 300942e30bf3SVlad Yasevich */ 301042e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3011945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 301242e30bf3SVlad Yasevich 30131da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30141da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 301542e30bf3SVlad Yasevich /* Section 4.2.1: 301642e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 301742e30bf3SVlad Yasevich * address of the packet MUST be added. 301842e30bf3SVlad Yasevich */ 301942e30bf3SVlad Yasevich if (af->is_any(&addr)) 302042e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 302142e30bf3SVlad Yasevich 30221da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30231da177e4SLinus Torvalds * request and does not have the local resources to add this 30241da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30251da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30261da177e4SLinus Torvalds * Due to Resource Shortage'. 30271da177e4SLinus Torvalds */ 30281da177e4SLinus Torvalds 3029dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30301da177e4SLinus Torvalds if (!peer) 30311da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30321da177e4SLinus Torvalds 30331da177e4SLinus Torvalds /* Start the heartbeat timer. */ 30341da177e4SLinus Torvalds if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) 30351da177e4SLinus Torvalds sctp_transport_hold(peer); 30366af29cccSMichio Honda asoc->new_transport = peer; 30371da177e4SLinus Torvalds break; 30381da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30391da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30401da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30411da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30421da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 30431da177e4SLinus Torvalds */ 304442e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 30451da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 30461da177e4SLinus Torvalds 30471da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 30481da177e4SLinus Torvalds * address which is also the source address of the IP packet 30491da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 30501da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 30511da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 30521da177e4SLinus Torvalds * Delete Source IP Address' 30531da177e4SLinus Torvalds */ 3054b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 30551da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 30561da177e4SLinus Torvalds 305742e30bf3SVlad Yasevich /* Section 4.2.2 305842e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 305942e30bf3SVlad Yasevich * addresses of the peer except the source address of the 306042e30bf3SVlad Yasevich * packet MUST be deleted. 306142e30bf3SVlad Yasevich */ 306242e30bf3SVlad Yasevich if (af->is_any(&addr)) { 306342e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 306442e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 306542e30bf3SVlad Yasevich asconf->transport); 306642e30bf3SVlad Yasevich } else 3067dd86d136SAl Viro sctp_assoc_del_peer(asoc, &addr); 30681da177e4SLinus Torvalds break; 30691da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 307042e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 307142e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 307242e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 307342e30bf3SVlad Yasevich * primary. 307442e30bf3SVlad Yasevich */ 307542e30bf3SVlad Yasevich if (af->is_any(&addr)) 307642e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 307742e30bf3SVlad Yasevich 3078dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 30791da177e4SLinus Torvalds if (!peer) 3080945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30811da177e4SLinus Torvalds 30821da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 30831da177e4SLinus Torvalds break; 30841da177e4SLinus Torvalds } 30851da177e4SLinus Torvalds 30861da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 30871da177e4SLinus Torvalds } 30881da177e4SLinus Torvalds 30896f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 30906f4c618dSWei Yongjun int sctp_verify_asconf(const struct sctp_association *asoc, 30916f4c618dSWei Yongjun struct sctp_paramhdr *param_hdr, void *chunk_end, 30926f4c618dSWei Yongjun struct sctp_paramhdr **errp) { 30936f4c618dSWei Yongjun sctp_addip_param_t *asconf_param; 30946f4c618dSWei Yongjun union sctp_params param; 30956f4c618dSWei Yongjun int length, plen; 30966f4c618dSWei Yongjun 30976f4c618dSWei Yongjun param.v = (sctp_paramhdr_t *) param_hdr; 30986f4c618dSWei Yongjun while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) { 30996f4c618dSWei Yongjun length = ntohs(param.p->length); 31006f4c618dSWei Yongjun *errp = param.p; 31016f4c618dSWei Yongjun 31026f4c618dSWei Yongjun if (param.v > chunk_end - length || 31036f4c618dSWei Yongjun length < sizeof(sctp_paramhdr_t)) 31046f4c618dSWei Yongjun return 0; 31056f4c618dSWei Yongjun 31066f4c618dSWei Yongjun switch (param.p->type) { 31076f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31086f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31096f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31106f4c618dSWei Yongjun asconf_param = (sctp_addip_param_t *)param.v; 31116f4c618dSWei Yongjun plen = ntohs(asconf_param->param_hdr.length); 31126f4c618dSWei Yongjun if (plen < sizeof(sctp_addip_param_t) + 31136f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 31146f4c618dSWei Yongjun return 0; 31156f4c618dSWei Yongjun break; 31166f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 31176f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 31186f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 31196f4c618dSWei Yongjun return 0; 31206f4c618dSWei Yongjun 31216f4c618dSWei Yongjun break; 31226f4c618dSWei Yongjun default: 31236f4c618dSWei Yongjun break; 31246f4c618dSWei Yongjun } 31256f4c618dSWei Yongjun 31266f4c618dSWei Yongjun param.v += WORD_ROUND(length); 31276f4c618dSWei Yongjun } 31286f4c618dSWei Yongjun 31296f4c618dSWei Yongjun if (param.v != chunk_end) 31306f4c618dSWei Yongjun return 0; 31316f4c618dSWei Yongjun 31326f4c618dSWei Yongjun return 1; 31336f4c618dSWei Yongjun } 31346f4c618dSWei Yongjun 31351da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 31361da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 31371da177e4SLinus Torvalds */ 31381da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 31391da177e4SLinus Torvalds struct sctp_chunk *asconf) 31401da177e4SLinus Torvalds { 31411da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 31421da177e4SLinus Torvalds union sctp_addr_param *addr_param; 31431da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 31441da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 31451da177e4SLinus Torvalds 3146dbc16db1SAl Viro __be16 err_code; 31471da177e4SLinus Torvalds int length = 0; 3148f3830cccSWei Yongjun int chunk_len; 31491da177e4SLinus Torvalds __u32 serial; 31501da177e4SLinus Torvalds int all_param_pass = 1; 31511da177e4SLinus Torvalds 3152f3830cccSWei Yongjun chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); 31531da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 31541da177e4SLinus Torvalds serial = ntohl(hdr->serial); 31551da177e4SLinus Torvalds 31561da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 31571da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 31581da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 31591da177e4SLinus Torvalds chunk_len -= length; 31601da177e4SLinus Torvalds 31611da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 31627aa1b54bSJoe Perches * asconf parameter. 31631da177e4SLinus Torvalds */ 31646a435732SShan Wei length = ntohs(addr_param->p.length); 3165ea110733SJoe Perches asconf_param = (void *)addr_param + length; 31661da177e4SLinus Torvalds chunk_len -= length; 31671da177e4SLinus Torvalds 31681da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 31691da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 31702cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 31717aa1b54bSJoe Perches * parameters. 31721da177e4SLinus Torvalds */ 31732cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 31741da177e4SLinus Torvalds if (!asconf_ack) 31751da177e4SLinus Torvalds goto done; 31761da177e4SLinus Torvalds 31771da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 31781da177e4SLinus Torvalds while (chunk_len > 0) { 31791da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 31801da177e4SLinus Torvalds asconf_param); 31811da177e4SLinus Torvalds /* ADDIP 4.1 A7) 31821da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 31831da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 31841da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 31851da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 31861da177e4SLinus Torvalds * a specific success indication is present for the parameter. 31871da177e4SLinus Torvalds */ 31881da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR != err_code) 31891da177e4SLinus Torvalds all_param_pass = 0; 31901da177e4SLinus Torvalds 31911da177e4SLinus Torvalds if (!all_param_pass) 31921da177e4SLinus Torvalds sctp_add_asconf_response(asconf_ack, 31931da177e4SLinus Torvalds asconf_param->crr_id, err_code, 31941da177e4SLinus Torvalds asconf_param); 31951da177e4SLinus Torvalds 31961da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 31971da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 31981da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 31991da177e4SLinus Torvalds * in the ASCONF. 32001da177e4SLinus Torvalds */ 32011da177e4SLinus Torvalds if (SCTP_ERROR_RSRC_LOW == err_code) 32021da177e4SLinus Torvalds goto done; 32031da177e4SLinus Torvalds 32041da177e4SLinus Torvalds /* Move to the next ASCONF param. */ 32051da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3206ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 32071da177e4SLinus Torvalds chunk_len -= length; 32081da177e4SLinus Torvalds } 32091da177e4SLinus Torvalds 32101da177e4SLinus Torvalds done: 32111da177e4SLinus Torvalds asoc->peer.addip_serial++; 32121da177e4SLinus Torvalds 32131da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 32141da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 32151da177e4SLinus Torvalds */ 32161da177e4SLinus Torvalds if (asconf_ack) { 32171da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3218a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3219a08de64dSVlad Yasevich &asoc->asconf_ack_list); 32201da177e4SLinus Torvalds } 32211da177e4SLinus Torvalds 32221da177e4SLinus Torvalds return asconf_ack; 32231da177e4SLinus Torvalds } 32241da177e4SLinus Torvalds 32251da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3226425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 32271da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 32281da177e4SLinus Torvalds { 32291da177e4SLinus Torvalds struct sctp_af *af; 32301da177e4SLinus Torvalds union sctp_addr addr; 32311da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 32321da177e4SLinus Torvalds union sctp_addr_param *addr_param; 32331da177e4SLinus Torvalds struct sctp_transport *transport; 3234dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 32351da177e4SLinus Torvalds 3236ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 32371da177e4SLinus Torvalds 32381da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 32396a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3240dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 32411da177e4SLinus Torvalds 32421da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 32431da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3244559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3245559cf710SVlad Yasevich * held, so the list can not change. 3246559cf710SVlad Yasevich */ 32470ed90fb0SVlad Yasevich local_bh_disable(); 3248559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3249dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3250f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3251dc022a98SSridhar Samudrala } 32520ed90fb0SVlad Yasevich local_bh_enable(); 32533cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 32543cd9749cSWei Yongjun transports) { 32553cd9749cSWei Yongjun dst_release(transport->dst); 3256c6ef006bSVlad Yasevich transport->dst = NULL; 32573cd9749cSWei Yongjun } 32581da177e4SLinus Torvalds break; 32591da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 32600ed90fb0SVlad Yasevich local_bh_disable(); 3261425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 32628a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 32638a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 32648a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 32658a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 32668a07eb0aSMichio Honda } 32670ed90fb0SVlad Yasevich local_bh_enable(); 32689dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 32699dbc15f0SRobert P. J. Day transports) { 3270dc022a98SSridhar Samudrala dst_release(transport->dst); 3271c6ef006bSVlad Yasevich transport->dst = NULL; 32721da177e4SLinus Torvalds } 32731da177e4SLinus Torvalds break; 32741da177e4SLinus Torvalds default: 32751da177e4SLinus Torvalds break; 32761da177e4SLinus Torvalds } 32771da177e4SLinus Torvalds } 32781da177e4SLinus Torvalds 32791da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 32801da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 32811da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 32821da177e4SLinus Torvalds * ADDIP 4.1 32831da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 32841da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 32851da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 32861da177e4SLinus Torvalds * specific success indication is present for the parameter. 32871da177e4SLinus Torvalds */ 3288dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 32891da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 32901da177e4SLinus Torvalds int no_err) 32911da177e4SLinus Torvalds { 32921da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 32931da177e4SLinus Torvalds sctp_errhdr_t *err_param; 32941da177e4SLinus Torvalds int length; 3295f3830cccSWei Yongjun int asconf_ack_len; 3296dbc16db1SAl Viro __be16 err_code; 32971da177e4SLinus Torvalds 32981da177e4SLinus Torvalds if (no_err) 32991da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33001da177e4SLinus Torvalds else 33011da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33021da177e4SLinus Torvalds 3303f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3304f3830cccSWei Yongjun sizeof(sctp_chunkhdr_t); 3305f3830cccSWei Yongjun 33061da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33071da177e4SLinus Torvalds * the first asconf_ack parameter. 33081da177e4SLinus Torvalds */ 33091da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 33101da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 33111da177e4SLinus Torvalds length); 33121da177e4SLinus Torvalds asconf_ack_len -= length; 33131da177e4SLinus Torvalds 33141da177e4SLinus Torvalds while (asconf_ack_len > 0) { 33151da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 33161da177e4SLinus Torvalds switch(asconf_ack_param->param_hdr.type) { 33171da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 33181da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 33191da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 33201da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 3321ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 33221da177e4SLinus Torvalds asconf_ack_len -= length; 33231da177e4SLinus Torvalds if (asconf_ack_len > 0) 33241da177e4SLinus Torvalds return err_param->cause; 33251da177e4SLinus Torvalds else 33261da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33271da177e4SLinus Torvalds break; 33281da177e4SLinus Torvalds default: 33291da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33301da177e4SLinus Torvalds } 33311da177e4SLinus Torvalds } 33321da177e4SLinus Torvalds 33331da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3334ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 33351da177e4SLinus Torvalds asconf_ack_len -= length; 33361da177e4SLinus Torvalds } 33371da177e4SLinus Torvalds 33381da177e4SLinus Torvalds return err_code; 33391da177e4SLinus Torvalds } 33401da177e4SLinus Torvalds 33411da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 33421da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 33431da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 33441da177e4SLinus Torvalds { 33451da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 33461da177e4SLinus Torvalds union sctp_addr_param *addr_param; 33471da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 33481da177e4SLinus Torvalds int length = 0; 33491da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 33501da177e4SLinus Torvalds int all_param_pass = 0; 33511da177e4SLinus Torvalds int no_err = 1; 33521da177e4SLinus Torvalds int retval = 0; 3353dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 33541da177e4SLinus Torvalds 33551da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 33561da177e4SLinus Torvalds * a pointer to address parameter. 33571da177e4SLinus Torvalds */ 33581da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 33591da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 33601da177e4SLinus Torvalds asconf_len -= length; 33611da177e4SLinus Torvalds 33621da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 33637aa1b54bSJoe Perches * pointer to the first asconf parameter. 33641da177e4SLinus Torvalds */ 33656a435732SShan Wei length = ntohs(addr_param->p.length); 3366ea110733SJoe Perches asconf_param = (void *)addr_param + length; 33671da177e4SLinus Torvalds asconf_len -= length; 33681da177e4SLinus Torvalds 33691da177e4SLinus Torvalds /* ADDIP 4.1 33701da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 33711da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 33721da177e4SLinus Torvalds * successful. 33731da177e4SLinus Torvalds */ 33741da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 33751da177e4SLinus Torvalds all_param_pass = 1; 33761da177e4SLinus Torvalds 33771da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 33781da177e4SLinus Torvalds while (asconf_len > 0) { 33791da177e4SLinus Torvalds if (all_param_pass) 33801da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33811da177e4SLinus Torvalds else { 33821da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 33831da177e4SLinus Torvalds asconf_param, 33841da177e4SLinus Torvalds no_err); 33851da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 33861da177e4SLinus Torvalds no_err = 0; 33871da177e4SLinus Torvalds } 33881da177e4SLinus Torvalds 33891da177e4SLinus Torvalds switch (err_code) { 33901da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3391425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 33921da177e4SLinus Torvalds break; 33931da177e4SLinus Torvalds 33941da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 33951da177e4SLinus Torvalds retval = 1; 33961da177e4SLinus Torvalds break; 33971da177e4SLinus Torvalds 3398a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 33991da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34001da177e4SLinus Torvalds * future. 34011da177e4SLinus Torvalds */ 34021da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34031da177e4SLinus Torvalds asconf_param->param_hdr.type; 34041da177e4SLinus Torvalds break; 34051da177e4SLinus Torvalds 34061da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34071da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34081da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34091da177e4SLinus Torvalds default: 34101da177e4SLinus Torvalds break; 34111da177e4SLinus Torvalds } 34121da177e4SLinus Torvalds 34131da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 34141da177e4SLinus Torvalds * one. 34151da177e4SLinus Torvalds */ 34161da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3417ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 34181da177e4SLinus Torvalds asconf_len -= length; 34191da177e4SLinus Torvalds } 34201da177e4SLinus Torvalds 3421ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 34228a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3423ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3424ddc4bbeeSMichio Honda } 34258a07eb0aSMichio Honda 34261da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 34275f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 34281da177e4SLinus Torvalds sctp_chunk_free(asconf); 34291da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 34301da177e4SLinus Torvalds 34311da177e4SLinus Torvalds return retval; 34321da177e4SLinus Torvalds } 34331da177e4SLinus Torvalds 34341da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 34351da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 34361da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 34371da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 34381da177e4SLinus Torvalds { 34391da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 34401da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 34411da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 34421da177e4SLinus Torvalds size_t hint; 34431da177e4SLinus Torvalds int i; 34441da177e4SLinus Torvalds 34451da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 34461da177e4SLinus Torvalds 34471da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint); 34481da177e4SLinus Torvalds 34491da177e4SLinus Torvalds if (!retval) 34501da177e4SLinus Torvalds return NULL; 34511da177e4SLinus Torvalds 34521da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 34531da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 34541da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 34551da177e4SLinus Torvalds 34561da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 34571da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 34581da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 34591da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 34601da177e4SLinus Torvalds } 34611da177e4SLinus Torvalds 34621da177e4SLinus Torvalds return retval; 34631da177e4SLinus Torvalds } 3464