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): 3291705c61SDaniel Borkmann * lksctp developers <linux-sctp@vger.kernel.org> 331da177e4SLinus Torvalds * 341da177e4SLinus Torvalds * Written or modified by: 351da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 361da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 371da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 381da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 391da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 401da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 411da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 421da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 431da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 441da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 451da177e4SLinus Torvalds */ 461da177e4SLinus Torvalds 47145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 48145ce502SJoe Perches 491da177e4SLinus Torvalds #include <linux/types.h> 501da177e4SLinus Torvalds #include <linux/kernel.h> 511da177e4SLinus Torvalds #include <linux/ip.h> 521da177e4SLinus Torvalds #include <linux/ipv6.h> 531da177e4SLinus Torvalds #include <linux/net.h> 541da177e4SLinus Torvalds #include <linux/inet.h> 55ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 561da177e4SLinus Torvalds #include <linux/crypto.h> 575a0e3ad6STejun Heo #include <linux/slab.h> 581da177e4SLinus Torvalds #include <net/sock.h> 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds #include <linux/skbuff.h> 611da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 621da177e4SLinus Torvalds #include <net/sctp/sctp.h> 631da177e4SLinus Torvalds #include <net/sctp/sm.h> 641da177e4SLinus Torvalds 65072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 66072017b4SVlad Yasevich __u8 type, __u8 flags, int paylen); 67072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 68072017b4SVlad Yasevich __u8 flags, int paylen); 69072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 701da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen); 711da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 721da177e4SLinus Torvalds const struct sctp_association *asoc, 731da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 741da177e4SLinus Torvalds int *cookie_len, 751da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 761da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 771da177e4SLinus Torvalds union sctp_params param, 781da177e4SLinus Torvalds const union sctp_addr *peer_addr, 79dd0fc66fSAl Viro gfp_t gfp); 808ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 818ee4be37SVlad Yasevich const void *data); 821da177e4SLinus Torvalds 83072017b4SVlad Yasevich /* Control chunk destructor */ 84072017b4SVlad Yasevich static void sctp_control_release_owner(struct sk_buff *skb) 85072017b4SVlad Yasevich { 86072017b4SVlad Yasevich /*TODO: do memory release */ 87072017b4SVlad Yasevich } 88072017b4SVlad Yasevich 89072017b4SVlad Yasevich static void sctp_control_set_owner_w(struct sctp_chunk *chunk) 90072017b4SVlad Yasevich { 91072017b4SVlad Yasevich struct sctp_association *asoc = chunk->asoc; 92072017b4SVlad Yasevich struct sk_buff *skb = chunk->skb; 93072017b4SVlad Yasevich 94072017b4SVlad Yasevich /* TODO: properly account for control chunks. 95072017b4SVlad Yasevich * To do it right we'll need: 96072017b4SVlad Yasevich * 1) endpoint if association isn't known. 97072017b4SVlad Yasevich * 2) proper memory accounting. 98072017b4SVlad Yasevich * 99072017b4SVlad Yasevich * For now don't do anything for now. 100072017b4SVlad Yasevich */ 101072017b4SVlad Yasevich skb->sk = asoc ? asoc->base.sk : NULL; 102072017b4SVlad Yasevich skb->destructor = sctp_control_release_owner; 103072017b4SVlad Yasevich } 104072017b4SVlad Yasevich 1051da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 1061da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds struct sctp_af *af; 1091da177e4SLinus Torvalds int iif = 0; 1101da177e4SLinus Torvalds 111eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version)); 1121da177e4SLinus Torvalds if (af) 1131da177e4SLinus Torvalds iif = af->skb_iif(chunk->skb); 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds return iif; 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1191da177e4SLinus Torvalds * 1201da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1211da177e4SLinus Torvalds * Explicit Congestion Notification. 1221da177e4SLinus Torvalds */ 1231da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1241da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 12509640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1261da177e4SLinus Torvalds }; 1271da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1281da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 12909640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1301da177e4SLinus Torvalds }; 1311da177e4SLinus Torvalds 1325fa782c2SNeil Horman /* A helper to initialize an op error inside a 1331da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1341da177e4SLinus Torvalds * abort chunk. 1351da177e4SLinus Torvalds */ 1365bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 13700f1c2dfSWei Yongjun size_t paylen) 1381da177e4SLinus Torvalds { 1391da177e4SLinus Torvalds sctp_errhdr_t err; 1401da177e4SLinus Torvalds __u16 len; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1431da177e4SLinus Torvalds err.cause = cause_code; 1441da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1451da177e4SLinus Torvalds err.length = htons(len); 1464a1c0107SVlad Yasevich chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds 1495fa782c2SNeil Horman /* A helper to initialize an op error inside a 1505fa782c2SNeil Horman * provided chunk, as most cause codes will be embedded inside an 1515fa782c2SNeil Horman * abort chunk. Differs from sctp_init_cause in that it won't oops 1525fa782c2SNeil Horman * if there isn't enough space in the op error chunk 1535fa782c2SNeil Horman */ 154db28aafaSIoan Orghici static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, 1555fa782c2SNeil Horman size_t paylen) 1565fa782c2SNeil Horman { 1575fa782c2SNeil Horman sctp_errhdr_t err; 1585fa782c2SNeil Horman __u16 len; 1595fa782c2SNeil Horman 1605fa782c2SNeil Horman /* Cause code constants are now defined in network order. */ 1615fa782c2SNeil Horman err.cause = cause_code; 1625fa782c2SNeil Horman len = sizeof(sctp_errhdr_t) + paylen; 1635fa782c2SNeil Horman err.length = htons(len); 1645fa782c2SNeil Horman 1652e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) < len) 1665fa782c2SNeil Horman return -ENOSPC; 1675fa782c2SNeil Horman chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, 1685fa782c2SNeil Horman sizeof(sctp_errhdr_t), 1695fa782c2SNeil Horman &err); 1705fa782c2SNeil Horman return 0; 1715fa782c2SNeil Horman } 1721da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1731da177e4SLinus Torvalds * 1741da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1751da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1761da177e4SLinus Torvalds * 1771da177e4SLinus Torvalds * 0 1 2 3 1781da177e4SLinus 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 1791da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1801da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1811da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1821da177e4SLinus Torvalds * | Initiate Tag | 1831da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1841da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1851da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1861da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1881da177e4SLinus Torvalds * | Initial TSN | 1891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1901da177e4SLinus Torvalds * \ \ 1911da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1921da177e4SLinus Torvalds * \ \ 1931da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1941da177e4SLinus Torvalds * 1951da177e4SLinus Torvalds * 1961da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1971da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1981da177e4SLinus Torvalds * 1991da177e4SLinus Torvalds * Fixed Parameters Status 2001da177e4SLinus Torvalds * ---------------------------------------------- 2011da177e4SLinus Torvalds * Initiate Tag Mandatory 2021da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 2031da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 2041da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 2051da177e4SLinus Torvalds * Initial TSN Mandatory 2061da177e4SLinus Torvalds * 2071da177e4SLinus Torvalds * Variable Parameters Status Type Value 2081da177e4SLinus Torvalds * ------------------------------------------------------------- 2091da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 2101da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 2111da177e4SLinus Torvalds * Cookie Preservative Optional 9 2121da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 2131da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 2141da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 2151da177e4SLinus Torvalds */ 2161da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 2171da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 218dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2191da177e4SLinus Torvalds { 220e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2211da177e4SLinus Torvalds sctp_inithdr_t init; 2221da177e4SLinus Torvalds union sctp_params addrs; 2231da177e4SLinus Torvalds size_t chunksize; 2241da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2251da177e4SLinus Torvalds int num_types, addrs_len = 0; 2261da177e4SLinus Torvalds struct sctp_sock *sp; 2271da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 2283dbe8656SAl Viro __be16 types[2]; 2290f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 230131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 231131a47e3SVlad Yasevich int num_ext = 0; 232131a47e3SVlad Yasevich __u8 extensions[3]; 233730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 234730fc3d0SVlad Yasevich *auth_hmacs = NULL; 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2371da177e4SLinus Torvalds * 2381da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2391da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2401da177e4SLinus Torvalds */ 2411da177e4SLinus Torvalds retval = NULL; 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2441da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2471da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2481da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2491da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2501da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds /* How many address types are needed? */ 2531da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2541da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2551da177e4SLinus Torvalds 256a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 257a8170c35SWei Yongjun chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types)); 2581da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2598ee4be37SVlad Yasevich 260e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 261036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 262036b579bSVlad Yasevich 263131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 264131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 265131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 266131a47e3SVlad Yasevich * INIT-ACK parameters. 267131a47e3SVlad Yasevich */ 268e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) { 269131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 270131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 271131a47e3SVlad Yasevich num_ext += 2; 272131a47e3SVlad Yasevich } 273131a47e3SVlad Yasevich 2746fc791eeSmalc if (sp->adaptation_ind) 2751da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2766fc791eeSmalc 2771da177e4SLinus Torvalds chunksize += vparam_len; 2781da177e4SLinus Torvalds 279730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 280e1fc3b14SEric W. Biederman if (net->sctp.auth_enable) { 281730fc3d0SVlad Yasevich /* Add random parameter length*/ 282730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 283730fc3d0SVlad Yasevich 284730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 285730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 286730fc3d0SVlad Yasevich if (auth_hmacs->length) 287a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 288730fc3d0SVlad Yasevich else 289730fc3d0SVlad Yasevich auth_hmacs = NULL; 290730fc3d0SVlad Yasevich 291730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 292730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 293730fc3d0SVlad Yasevich if (auth_chunks->length) 294a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 295730fc3d0SVlad Yasevich else 2969baffaa6SVlad Yasevich auth_chunks = NULL; 297730fc3d0SVlad Yasevich 298730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 299730fc3d0SVlad Yasevich num_ext += 1; 300730fc3d0SVlad Yasevich } 301730fc3d0SVlad Yasevich 302131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 303131a47e3SVlad Yasevich if (num_ext) 304a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 305a8170c35SWei Yongjun num_ext); 306131a47e3SVlad Yasevich 3071da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3081da177e4SLinus Torvalds * 3091da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 3101da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 3111da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 3121da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 3131da177e4SLinus Torvalds * other address types if the Host Name address parameter is 3141da177e4SLinus Torvalds * present in the received INIT chunk. 3151da177e4SLinus Torvalds * 3161da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 3171da177e4SLinus Torvalds */ 3181da177e4SLinus Torvalds 319072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize); 3201da177e4SLinus Torvalds if (!retval) 3211da177e4SLinus Torvalds goto nodata; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds retval->subh.init_hdr = 3241da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3251da177e4SLinus Torvalds retval->param_hdr.v = 3261da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3291da177e4SLinus Torvalds * 3301da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3311da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3321da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3331da177e4SLinus Torvalds * support any address type. 3341da177e4SLinus Torvalds */ 3351da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3361da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3371da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3381da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 341131a47e3SVlad Yasevich 3427aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 343131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 344131a47e3SVlad Yasevich */ 345131a47e3SVlad Yasevich if (num_ext) { 346131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 347131a47e3SVlad Yasevich ext_param.param_hdr.length = 348131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 349131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 350131a47e3SVlad Yasevich &ext_param); 3518ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 352131a47e3SVlad Yasevich } 353131a47e3SVlad Yasevich 354e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 3551da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 356131a47e3SVlad Yasevich 3576fc791eeSmalc if (sp->adaptation_ind) { 3580f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3591da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3600f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3611da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3626fc791eeSmalc } 363131a47e3SVlad Yasevich 364730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 365e1fc3b14SEric W. Biederman if (net->sctp.auth_enable) { 366730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 367730fc3d0SVlad Yasevich asoc->c.auth_random); 368730fc3d0SVlad Yasevich if (auth_hmacs) 369730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 370730fc3d0SVlad Yasevich auth_hmacs); 371730fc3d0SVlad Yasevich if (auth_chunks) 372730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 373730fc3d0SVlad Yasevich auth_chunks); 374730fc3d0SVlad Yasevich } 3751da177e4SLinus Torvalds nodata: 3761da177e4SLinus Torvalds kfree(addrs.v); 3771da177e4SLinus Torvalds return retval; 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3811da177e4SLinus Torvalds const struct sctp_chunk *chunk, 382dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3831da177e4SLinus Torvalds { 3841da177e4SLinus Torvalds sctp_inithdr_t initack; 3851da177e4SLinus Torvalds struct sctp_chunk *retval; 3861da177e4SLinus Torvalds union sctp_params addrs; 3876fc791eeSmalc struct sctp_sock *sp; 3881da177e4SLinus Torvalds int addrs_len; 3891da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3901da177e4SLinus Torvalds int cookie_len; 3911da177e4SLinus Torvalds size_t chunksize; 3920f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 393131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 394131a47e3SVlad Yasevich int num_ext = 0; 395131a47e3SVlad Yasevich __u8 extensions[3]; 396730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 397730fc3d0SVlad Yasevich *auth_hmacs = NULL, 398730fc3d0SVlad Yasevich *auth_random = NULL; 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds retval = NULL; 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 4031da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 4061da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 4071da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 4081da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 4091da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 4121da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 4131da177e4SLinus Torvalds */ 4141da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 4151da177e4SLinus Torvalds addrs.v, addrs_len); 4161da177e4SLinus Torvalds if (!cookie) 4171da177e4SLinus Torvalds goto nomem_cookie; 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4201da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4211da177e4SLinus Torvalds */ 4226fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4231da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4261da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4271da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4281da177e4SLinus Torvalds 4295ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 430036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 431036b579bSVlad Yasevich 4325ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 433131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 434131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 435131a47e3SVlad Yasevich num_ext += 2; 436131a47e3SVlad Yasevich } 437131a47e3SVlad Yasevich 4386fc791eeSmalc if (sp->adaptation_ind) 4391da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4401da177e4SLinus Torvalds 441730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 442730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 443730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 444730fc3d0SVlad Yasevich 445730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 446730fc3d0SVlad Yasevich if (auth_hmacs->length) 447a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 448730fc3d0SVlad Yasevich else 449730fc3d0SVlad Yasevich auth_hmacs = NULL; 450730fc3d0SVlad Yasevich 451730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 452730fc3d0SVlad Yasevich if (auth_chunks->length) 453a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 454730fc3d0SVlad Yasevich else 455730fc3d0SVlad Yasevich auth_chunks = NULL; 456730fc3d0SVlad Yasevich 457730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 458730fc3d0SVlad Yasevich num_ext += 1; 459730fc3d0SVlad Yasevich } 460730fc3d0SVlad Yasevich 4618ee4be37SVlad Yasevich if (num_ext) 462a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 463a8170c35SWei Yongjun num_ext); 4648ee4be37SVlad Yasevich 4651da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 466072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize); 4671da177e4SLinus Torvalds if (!retval) 4681da177e4SLinus Torvalds goto nomem_chunk; 4691da177e4SLinus Torvalds 470b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 471b99a4d53SDan Carpenter * 472b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 473b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 474b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 475b99a4d53SDan Carpenter * to which it is replying. 476b99a4d53SDan Carpenter * 477b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4781da177e4SLinus Torvalds */ 4791da177e4SLinus Torvalds retval->transport = chunk->transport; 480b99a4d53SDan Carpenter 4811da177e4SLinus Torvalds retval->subh.init_hdr = 4821da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4831da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4841da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4851da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4861da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 487131a47e3SVlad Yasevich if (num_ext) { 488131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 489131a47e3SVlad Yasevich ext_param.param_hdr.length = 490131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 491131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 492131a47e3SVlad Yasevich &ext_param); 4938ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 494131a47e3SVlad Yasevich } 4951da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 4961da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 4971da177e4SLinus Torvalds 4986fc791eeSmalc if (sp->adaptation_ind) { 4990f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 5001da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 5016fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 5021da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 5036fc791eeSmalc } 5041da177e4SLinus Torvalds 505730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 506730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 507730fc3d0SVlad Yasevich auth_random); 508730fc3d0SVlad Yasevich if (auth_hmacs) 509730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 510730fc3d0SVlad Yasevich auth_hmacs); 511730fc3d0SVlad Yasevich if (auth_chunks) 512730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 513730fc3d0SVlad Yasevich auth_chunks); 514730fc3d0SVlad Yasevich } 515730fc3d0SVlad Yasevich 5161da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 5171da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds nomem_chunk: 5201da177e4SLinus Torvalds kfree(cookie); 5211da177e4SLinus Torvalds nomem_cookie: 5221da177e4SLinus Torvalds kfree(addrs.v); 5231da177e4SLinus Torvalds return retval; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5271da177e4SLinus Torvalds * 5281da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5291da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5301da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5311da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5321da177e4SLinus Torvalds * chunks in the same packet. 5331da177e4SLinus Torvalds * 5341da177e4SLinus Torvalds * 0 1 2 3 5351da177e4SLinus 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 5361da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5371da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5381da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5391da177e4SLinus Torvalds * / Cookie / 5401da177e4SLinus Torvalds * \ \ 5411da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5421da177e4SLinus Torvalds * 5431da177e4SLinus Torvalds * Chunk Flags: 8 bit 5441da177e4SLinus Torvalds * 5451da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5461da177e4SLinus Torvalds * 5471da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5481da177e4SLinus Torvalds * 5491da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5501da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5511da177e4SLinus Torvalds * 5521da177e4SLinus Torvalds * Cookie: variable size 5531da177e4SLinus Torvalds * 5541da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5551da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5561da177e4SLinus Torvalds * 5571da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5581da177e4SLinus Torvalds * to insure interoperability. 5591da177e4SLinus Torvalds */ 5601da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5611da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5621da177e4SLinus Torvalds { 5631da177e4SLinus Torvalds struct sctp_chunk *retval; 5641da177e4SLinus Torvalds void *cookie; 5651da177e4SLinus Torvalds int cookie_len; 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5681da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 571072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); 5721da177e4SLinus Torvalds if (!retval) 5731da177e4SLinus Torvalds goto nodata; 5741da177e4SLinus Torvalds retval->subh.cookie_hdr = 5751da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5781da177e4SLinus Torvalds * 5791da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5801da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5811da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5821da177e4SLinus Torvalds * to which it is replying. 5831da177e4SLinus Torvalds * 5841da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5851da177e4SLinus Torvalds */ 5861da177e4SLinus Torvalds if (chunk) 5871da177e4SLinus Torvalds retval->transport = chunk->transport; 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds nodata: 5901da177e4SLinus Torvalds return retval; 5911da177e4SLinus Torvalds } 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5941da177e4SLinus Torvalds * 5951da177e4SLinus Torvalds * This chunk is used only during the initialization of an 5961da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 5971da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 5981da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 5991da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 6001da177e4SLinus Torvalds * 6011da177e4SLinus Torvalds * 0 1 2 3 6021da177e4SLinus 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 6031da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6041da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 6051da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6061da177e4SLinus Torvalds * 6071da177e4SLinus Torvalds * Chunk Flags: 8 bits 6081da177e4SLinus Torvalds * 6091da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 6101da177e4SLinus Torvalds */ 6111da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 6121da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6131da177e4SLinus Torvalds { 6141da177e4SLinus Torvalds struct sctp_chunk *retval; 6151da177e4SLinus Torvalds 616072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0); 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6191da177e4SLinus Torvalds * 6201da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6211da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6221da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6231da177e4SLinus Torvalds * to which it is replying. 6241da177e4SLinus Torvalds * 6251da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6261da177e4SLinus Torvalds */ 6271da177e4SLinus Torvalds if (retval && chunk) 6281da177e4SLinus Torvalds retval->transport = chunk->transport; 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds return retval; 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds /* 6341da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6351da177e4SLinus Torvalds * CWR: 6361da177e4SLinus Torvalds * 6371da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6381da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6391da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6401da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6411da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6421da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6431da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6441da177e4SLinus Torvalds * CE bit. 6451da177e4SLinus Torvalds * 6461da177e4SLinus Torvalds * 0 1 2 3 6471da177e4SLinus 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 6481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6491da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6501da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6511da177e4SLinus Torvalds * | Lowest TSN Number | 6521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6531da177e4SLinus Torvalds * 6541da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6551da177e4SLinus Torvalds */ 6561da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6571da177e4SLinus Torvalds const __u32 lowest_tsn, 6581da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6591da177e4SLinus Torvalds { 6601da177e4SLinus Torvalds struct sctp_chunk *retval; 6611da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 664072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, 6651da177e4SLinus Torvalds sizeof(sctp_cwrhdr_t)); 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds if (!retval) 6681da177e4SLinus Torvalds goto nodata; 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6711da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6741da177e4SLinus Torvalds * 6751da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6761da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6771da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6781da177e4SLinus Torvalds * to which it is replying. 6791da177e4SLinus Torvalds * 6801da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6811da177e4SLinus Torvalds * came from.] 6821da177e4SLinus Torvalds */ 6831da177e4SLinus Torvalds if (chunk) 6841da177e4SLinus Torvalds retval->transport = chunk->transport; 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds nodata: 6871da177e4SLinus Torvalds return retval; 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6911da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6921da177e4SLinus Torvalds const __u32 lowest_tsn) 6931da177e4SLinus Torvalds { 6941da177e4SLinus Torvalds struct sctp_chunk *retval; 6951da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 698072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, 6991da177e4SLinus Torvalds sizeof(sctp_ecnehdr_t)); 7001da177e4SLinus Torvalds if (!retval) 7011da177e4SLinus Torvalds goto nodata; 7021da177e4SLinus Torvalds retval->subh.ecne_hdr = 7031da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds nodata: 7061da177e4SLinus Torvalds return retval; 7071da177e4SLinus Torvalds } 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 7101da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 7111da177e4SLinus Torvalds */ 7121da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 7131da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 7141da177e4SLinus Torvalds int data_len, __u8 flags, __u16 ssn) 7151da177e4SLinus Torvalds { 7161da177e4SLinus Torvalds struct sctp_chunk *retval; 7171da177e4SLinus Torvalds struct sctp_datahdr dp; 7181da177e4SLinus Torvalds int chunk_len; 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7211da177e4SLinus Torvalds * creating the chunk. 7221da177e4SLinus Torvalds */ 7231da177e4SLinus Torvalds dp.tsn = 0; 7241da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 7251da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 728eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 7291da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7301da177e4SLinus Torvalds dp.ssn = 0; 7311da177e4SLinus Torvalds } else 7321da177e4SLinus Torvalds dp.ssn = htons(ssn); 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 735072017b4SVlad Yasevich retval = sctp_make_data(asoc, flags, chunk_len); 7361da177e4SLinus Torvalds if (!retval) 7371da177e4SLinus Torvalds goto nodata; 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7401da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds nodata: 7431da177e4SLinus Torvalds return retval; 7441da177e4SLinus Torvalds } 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7471da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7481da177e4SLinus Torvalds * including duplicates and gaps. 7491da177e4SLinus Torvalds */ 7501da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7511da177e4SLinus Torvalds { 7521da177e4SLinus Torvalds struct sctp_chunk *retval; 7531da177e4SLinus Torvalds struct sctp_sackhdr sack; 7541da177e4SLinus Torvalds int len; 7551da177e4SLinus Torvalds __u32 ctsn; 7561da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7574244854dSNeil Horman struct sctp_association *aptr = (struct sctp_association *)asoc; 7581da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 75902015180SVlad Yasevich struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 7604244854dSNeil Horman struct sctp_transport *trans; 7611da177e4SLinus Torvalds 76202015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7631da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 764bb33381dSDaniel Borkmann 765bb33381dSDaniel Borkmann pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 76802015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7691da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds /* Initialize the SACK header. */ 7721da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7731da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7741da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7751da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds len = sizeof(sack) 7781da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7791da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds /* Create the chunk. */ 782072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len); 7831da177e4SLinus Torvalds if (!retval) 7841da177e4SLinus Torvalds goto nodata; 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7871da177e4SLinus Torvalds * 7881da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7891da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7901da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7911da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7921da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7931da177e4SLinus Torvalds * reply chunk. 7941da177e4SLinus Torvalds * 7951da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 7961da177e4SLinus Torvalds * in packets from different source addresses in a single 7971da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 7981da177e4SLinus Torvalds * destination transport addresses from which the DATA or 7991da177e4SLinus Torvalds * control chunks being acknowledged were received. 8001da177e4SLinus Torvalds * 8011da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 8021da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 8031da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 8041da177e4SLinus Torvalds * duplicates. --piggy] 8051da177e4SLinus Torvalds * 8061da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 8071da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 8081da177e4SLinus Torvalds * destination address and not use the source address of the 8091da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 8101da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 8111da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 8121da177e4SLinus Torvalds * for the SACK is broken. 8131da177e4SLinus Torvalds * 8141da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 8151da177e4SLinus Torvalds */ 8161da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds retval->subh.sack_hdr = 8191da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds /* Add the gap ack block information. */ 8221da177e4SLinus Torvalds if (num_gabs) 8231da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 82402015180SVlad Yasevich gabs); 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 827196d6759SMichele Baldessari if (num_dup_tsns) { 828196d6759SMichele Baldessari aptr->stats.idupchunks += num_dup_tsns; 8291da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8301da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 831196d6759SMichele Baldessari } 8324244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8334244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8344244854dSNeil Horman * the association generation to 1 8354244854dSNeil Horman * 8364244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8374244854dSNeil Horman * association so no transport will match after a wrap event like this, 8384244854dSNeil Horman * Until the next sack 8394244854dSNeil Horman */ 8404244854dSNeil Horman if (++aptr->peer.sack_generation == 0) { 8414244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8424244854dSNeil Horman transports) 8434244854dSNeil Horman trans->sack_generation = 0; 8444244854dSNeil Horman aptr->peer.sack_generation = 1; 8454244854dSNeil Horman } 8461da177e4SLinus Torvalds nodata: 8471da177e4SLinus Torvalds return retval; 8481da177e4SLinus Torvalds } 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8511da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8521da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8531da177e4SLinus Torvalds { 8541da177e4SLinus Torvalds struct sctp_chunk *retval; 8551da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 8561da177e4SLinus Torvalds __u32 ctsn; 8571da177e4SLinus Torvalds 8581da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8591da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8601da177e4SLinus Torvalds 861072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, 8621da177e4SLinus Torvalds sizeof(sctp_shutdownhdr_t)); 8631da177e4SLinus Torvalds if (!retval) 8641da177e4SLinus Torvalds goto nodata; 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8671da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds if (chunk) 8701da177e4SLinus Torvalds retval->transport = chunk->transport; 8711da177e4SLinus Torvalds nodata: 8721da177e4SLinus Torvalds return retval; 8731da177e4SLinus Torvalds } 8741da177e4SLinus Torvalds 8751da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8761da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8771da177e4SLinus Torvalds { 8781da177e4SLinus Torvalds struct sctp_chunk *retval; 8791da177e4SLinus Torvalds 880072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8831da177e4SLinus Torvalds * 8841da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8851da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8861da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8871da177e4SLinus Torvalds * to which it is replying. 8881da177e4SLinus Torvalds * 8891da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8901da177e4SLinus Torvalds */ 8911da177e4SLinus Torvalds if (retval && chunk) 8921da177e4SLinus Torvalds retval->transport = chunk->transport; 8931da177e4SLinus Torvalds 8941da177e4SLinus Torvalds return retval; 8951da177e4SLinus Torvalds } 8961da177e4SLinus Torvalds 8971da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 8981da177e4SLinus Torvalds const struct sctp_association *asoc, 8991da177e4SLinus Torvalds const struct sctp_chunk *chunk) 9001da177e4SLinus Torvalds { 9011da177e4SLinus Torvalds struct sctp_chunk *retval; 9021da177e4SLinus Torvalds __u8 flags = 0; 9031da177e4SLinus Torvalds 904047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 905047a2428SJerome Forissier * reflected) 906047a2428SJerome Forissier */ 9071da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 9081da177e4SLinus Torvalds 909072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9121da177e4SLinus Torvalds * 9131da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9141da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9151da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9161da177e4SLinus Torvalds * to which it is replying. 9171da177e4SLinus Torvalds * 9181da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 9191da177e4SLinus Torvalds * came from.] 9201da177e4SLinus Torvalds */ 9211da177e4SLinus Torvalds if (retval && chunk) 9221da177e4SLinus Torvalds retval->transport = chunk->transport; 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds return retval; 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 928047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9291da177e4SLinus Torvalds */ 9301da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9311da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9321da177e4SLinus Torvalds const size_t hint) 9331da177e4SLinus Torvalds { 9341da177e4SLinus Torvalds struct sctp_chunk *retval; 9351da177e4SLinus Torvalds __u8 flags = 0; 9361da177e4SLinus Torvalds 937047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 938047a2428SJerome Forissier * an INIT (vtag will be reflected). 939047a2428SJerome Forissier */ 940047a2428SJerome Forissier if (!asoc) { 941047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 942047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 943047a2428SJerome Forissier flags = 0; 944047a2428SJerome Forissier else 945047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 946047a2428SJerome Forissier } 9471da177e4SLinus Torvalds 948072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint); 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9511da177e4SLinus Torvalds * 9521da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9531da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9541da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9551da177e4SLinus Torvalds * to which it is replying. 9561da177e4SLinus Torvalds * 9571da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9581da177e4SLinus Torvalds */ 9591da177e4SLinus Torvalds if (retval && chunk) 9601da177e4SLinus Torvalds retval->transport = chunk->transport; 9611da177e4SLinus Torvalds 9621da177e4SLinus Torvalds return retval; 9631da177e4SLinus Torvalds } 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9661da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9671da177e4SLinus Torvalds const struct sctp_association *asoc, 9681da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 9691da177e4SLinus Torvalds { 9701da177e4SLinus Torvalds struct sctp_chunk *retval; 9719f81bcd9SAl Viro __be32 payload; 9721da177e4SLinus Torvalds 9731da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9741da177e4SLinus Torvalds + sizeof(tsn)); 9751da177e4SLinus Torvalds 9761da177e4SLinus Torvalds if (!retval) 9771da177e4SLinus Torvalds goto no_mem; 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9801da177e4SLinus Torvalds payload = htonl(tsn); 98100f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 98200f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9851da177e4SLinus Torvalds * 9861da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9871da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9881da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9891da177e4SLinus Torvalds * to which it is replying. 9901da177e4SLinus Torvalds * 9911da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9921da177e4SLinus Torvalds */ 9931da177e4SLinus Torvalds if (chunk) 9941da177e4SLinus Torvalds retval->transport = chunk->transport; 9951da177e4SLinus Torvalds 9961da177e4SLinus Torvalds no_mem: 9971da177e4SLinus Torvalds return retval; 9981da177e4SLinus Torvalds } 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 10011da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 1002c164a9baSSridhar Samudrala const struct msghdr *msg, 1003c164a9baSSridhar Samudrala size_t paylen) 10041da177e4SLinus Torvalds { 10051da177e4SLinus Torvalds struct sctp_chunk *retval; 1006c164a9baSSridhar Samudrala void *payload = NULL; 1007c164a9baSSridhar Samudrala int err; 10081da177e4SLinus Torvalds 1009c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 10101da177e4SLinus Torvalds if (!retval) 10111da177e4SLinus Torvalds goto err_chunk; 10121da177e4SLinus Torvalds 10131da177e4SLinus Torvalds if (paylen) { 10141da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 1015c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 10161da177e4SLinus Torvalds if (!payload) 10171da177e4SLinus Torvalds goto err_payload; 10181da177e4SLinus Torvalds 1019c164a9baSSridhar Samudrala err = memcpy_fromiovec(payload, msg->msg_iov, paylen); 1020c164a9baSSridhar Samudrala if (err < 0) 10211da177e4SLinus Torvalds goto err_copy; 10221da177e4SLinus Torvalds } 10231da177e4SLinus Torvalds 102400f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 102500f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10261da177e4SLinus Torvalds 10271da177e4SLinus Torvalds if (paylen) 10281da177e4SLinus Torvalds kfree(payload); 10291da177e4SLinus Torvalds 10301da177e4SLinus Torvalds return retval; 10311da177e4SLinus Torvalds 10321da177e4SLinus Torvalds err_copy: 10331da177e4SLinus Torvalds kfree(payload); 10341da177e4SLinus Torvalds err_payload: 10351da177e4SLinus Torvalds sctp_chunk_free(retval); 10361da177e4SLinus Torvalds retval = NULL; 10371da177e4SLinus Torvalds err_chunk: 10381da177e4SLinus Torvalds return retval; 10391da177e4SLinus Torvalds } 10401da177e4SLinus Torvalds 10415c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10425c94bf86SAdrian Bunk * enough. 10435c94bf86SAdrian Bunk */ 10445c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10455c94bf86SAdrian Bunk const void *data) 10465c94bf86SAdrian Bunk { 10475c94bf86SAdrian Bunk void *target; 10485c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 10495c94bf86SAdrian Bunk 10505c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10515c94bf86SAdrian Bunk 10526383cfb3SVlad Yasevich if (data) 10535c94bf86SAdrian Bunk memcpy(target, data, len); 10546383cfb3SVlad Yasevich else 10556383cfb3SVlad Yasevich memset(target, 0, len); 10565c94bf86SAdrian Bunk 10575c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10585c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10595c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10605c94bf86SAdrian Bunk 10615c94bf86SAdrian Bunk return target; 10625c94bf86SAdrian Bunk } 10635c94bf86SAdrian Bunk 10641da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10651da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10661da177e4SLinus Torvalds const struct sctp_association *asoc, 10671da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10681da177e4SLinus Torvalds const __u8 *payload, 10691da177e4SLinus Torvalds const size_t paylen) 10701da177e4SLinus Torvalds { 10711da177e4SLinus Torvalds struct sctp_chunk *retval; 10721da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10731da177e4SLinus Torvalds 10741da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 107500f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10761da177e4SLinus Torvalds if (!retval) 10771da177e4SLinus Torvalds goto end; 10781da177e4SLinus Torvalds 107900f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 108000f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10811da177e4SLinus Torvalds 10821da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10831da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 108400f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 108500f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds end: 10881da177e4SLinus Torvalds return retval; 10891da177e4SLinus Torvalds } 10901da177e4SLinus Torvalds 1091ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1092ba016670SWei Yongjun const struct sctp_association *asoc, 1093ba016670SWei Yongjun const struct sctp_chunk *chunk, 1094ba016670SWei Yongjun struct sctp_paramhdr *param) 1095ba016670SWei Yongjun { 1096ba016670SWei Yongjun struct sctp_chunk *retval; 1097ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1098ba016670SWei Yongjun size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + 1099ba016670SWei Yongjun sizeof(sctp_paramhdr_t); 1100ba016670SWei Yongjun 1101ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1102ba016670SWei Yongjun if (!retval) 1103ba016670SWei Yongjun goto nodata; 1104ba016670SWei Yongjun 1105ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 1106ba016670SWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 1107ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 1108ba016670SWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); 1109ba016670SWei Yongjun 1110ba016670SWei Yongjun nodata: 1111ba016670SWei Yongjun return retval; 1112ba016670SWei Yongjun } 1113ba016670SWei Yongjun 1114de4594a5SNeil Horman struct sctp_chunk *sctp_make_violation_max_retrans( 1115de4594a5SNeil Horman const struct sctp_association *asoc, 1116de4594a5SNeil Horman const struct sctp_chunk *chunk) 1117de4594a5SNeil Horman { 1118de4594a5SNeil Horman struct sctp_chunk *retval; 1119de4594a5SNeil Horman static const char error[] = "Association exceeded its max_retans count"; 1120de4594a5SNeil Horman size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t); 1121de4594a5SNeil Horman 1122de4594a5SNeil Horman retval = sctp_make_abort(asoc, chunk, payload_len); 1123de4594a5SNeil Horman if (!retval) 1124de4594a5SNeil Horman goto nodata; 1125de4594a5SNeil Horman 1126de4594a5SNeil Horman sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); 1127de4594a5SNeil Horman sctp_addto_chunk(retval, sizeof(error), error); 1128de4594a5SNeil Horman 1129de4594a5SNeil Horman nodata: 1130de4594a5SNeil Horman return retval; 1131de4594a5SNeil Horman } 1132de4594a5SNeil Horman 11331da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11341da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 113592c73af5SWei Yongjun const struct sctp_transport *transport) 11361da177e4SLinus Torvalds { 113792c73af5SWei Yongjun struct sctp_chunk *retval; 113892c73af5SWei Yongjun sctp_sender_hb_info_t hbinfo; 113992c73af5SWei Yongjun 1140072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo)); 11411da177e4SLinus Torvalds 11421da177e4SLinus Torvalds if (!retval) 11431da177e4SLinus Torvalds goto nodata; 11441da177e4SLinus Torvalds 114592c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 114692c73af5SWei Yongjun hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t)); 114792c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 114892c73af5SWei Yongjun hbinfo.sent_at = jiffies; 114992c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 115092c73af5SWei Yongjun 11511da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11521da177e4SLinus Torvalds * what transport it belongs to. 11531da177e4SLinus Torvalds */ 11541da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 115592c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 115692c73af5SWei Yongjun &hbinfo); 11571da177e4SLinus Torvalds 11581da177e4SLinus Torvalds nodata: 11591da177e4SLinus Torvalds return retval; 11601da177e4SLinus Torvalds } 11611da177e4SLinus Torvalds 11621da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11631da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11641da177e4SLinus Torvalds const void *payload, const size_t paylen) 11651da177e4SLinus Torvalds { 11661da177e4SLinus Torvalds struct sctp_chunk *retval; 11671da177e4SLinus Torvalds 1168072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); 11691da177e4SLinus Torvalds if (!retval) 11701da177e4SLinus Torvalds goto nodata; 11711da177e4SLinus Torvalds 11721da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11751da177e4SLinus Torvalds * 11761da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11771da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11781da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11791da177e4SLinus Torvalds * to which it is replying. 11801da177e4SLinus Torvalds * 11811da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 11821da177e4SLinus Torvalds */ 11831da177e4SLinus Torvalds if (chunk) 11841da177e4SLinus Torvalds retval->transport = chunk->transport; 11851da177e4SLinus Torvalds 11861da177e4SLinus Torvalds nodata: 11871da177e4SLinus Torvalds return retval; 11881da177e4SLinus Torvalds } 11891da177e4SLinus Torvalds 11901da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 11911da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 11921da177e4SLinus Torvalds */ 11931da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 11941da177e4SLinus Torvalds const struct sctp_association *asoc, 11951da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11961da177e4SLinus Torvalds size_t size) 11971da177e4SLinus Torvalds { 11981da177e4SLinus Torvalds struct sctp_chunk *retval; 11991da177e4SLinus Torvalds 1200072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 12011da177e4SLinus Torvalds sizeof(sctp_errhdr_t) + size); 12021da177e4SLinus Torvalds if (!retval) 12031da177e4SLinus Torvalds goto nodata; 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12061da177e4SLinus Torvalds * 12071da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12081da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12091da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12101da177e4SLinus Torvalds * to which it is replying. 12111da177e4SLinus Torvalds * 12121da177e4SLinus Torvalds */ 12131da177e4SLinus Torvalds if (chunk) 12141da177e4SLinus Torvalds retval->transport = chunk->transport; 12151da177e4SLinus Torvalds 12161da177e4SLinus Torvalds nodata: 12171da177e4SLinus Torvalds return retval; 12181da177e4SLinus Torvalds } 12191da177e4SLinus Torvalds 12205fa782c2SNeil Horman /* Create an Operation Error chunk of a fixed size, 12215fa782c2SNeil Horman * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) 12225fa782c2SNeil Horman * This is a helper function to allocate an error chunk for 12235fa782c2SNeil Horman * for those invalid parameter codes in which we may not want 1224d82603c6SJorrit Schippers * to report all the errors, if the incoming chunk is large 12255fa782c2SNeil Horman */ 12265fa782c2SNeil Horman static inline struct sctp_chunk *sctp_make_op_error_fixed( 12275fa782c2SNeil Horman const struct sctp_association *asoc, 12285fa782c2SNeil Horman const struct sctp_chunk *chunk) 12295fa782c2SNeil Horman { 12305fa782c2SNeil Horman size_t size = asoc ? asoc->pathmtu : 0; 12315fa782c2SNeil Horman 12325fa782c2SNeil Horman if (!size) 12335fa782c2SNeil Horman size = SCTP_DEFAULT_MAXSEGMENT; 12345fa782c2SNeil Horman 12355fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 12365fa782c2SNeil Horman } 12375fa782c2SNeil Horman 12381da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 12391da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12401da177e4SLinus Torvalds const struct sctp_chunk *chunk, 124163706c5cSAl Viro __be16 cause_code, const void *payload, 12426383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12431da177e4SLinus Torvalds { 12441da177e4SLinus Torvalds struct sctp_chunk *retval; 12451da177e4SLinus Torvalds 12466383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12471da177e4SLinus Torvalds if (!retval) 12481da177e4SLinus Torvalds goto nodata; 12491da177e4SLinus Torvalds 12506383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 125100f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12526383cfb3SVlad Yasevich if (reserve_tail) 12536383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12541da177e4SLinus Torvalds 12551da177e4SLinus Torvalds nodata: 12561da177e4SLinus Torvalds return retval; 12571da177e4SLinus Torvalds } 12581da177e4SLinus Torvalds 12594cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 12604cd57c80SVlad Yasevich { 12614cd57c80SVlad Yasevich struct sctp_chunk *retval; 12624cd57c80SVlad Yasevich struct sctp_hmac *hmac_desc; 12634cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 12644cd57c80SVlad Yasevich __u8 *hmac; 12654cd57c80SVlad Yasevich 12664cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12674cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12684cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12694cd57c80SVlad Yasevich return NULL; 12704cd57c80SVlad Yasevich 1271072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 12724cd57c80SVlad Yasevich hmac_desc->hmac_len + sizeof(sctp_authhdr_t)); 12734cd57c80SVlad Yasevich if (!retval) 12744cd57c80SVlad Yasevich return NULL; 12754cd57c80SVlad Yasevich 12764cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 12774cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 12784cd57c80SVlad Yasevich 12794cd57c80SVlad Yasevich retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), 12804cd57c80SVlad Yasevich &auth_hdr); 12814cd57c80SVlad Yasevich 12824cd57c80SVlad Yasevich hmac = skb_put(retval->skb, hmac_desc->hmac_len); 12834cd57c80SVlad Yasevich memset(hmac, 0, hmac_desc->hmac_len); 12844cd57c80SVlad Yasevich 12854cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 12864cd57c80SVlad Yasevich retval->chunk_hdr->length = 12874cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 12884cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 12894cd57c80SVlad Yasevich 12904cd57c80SVlad Yasevich return retval; 12914cd57c80SVlad Yasevich } 12924cd57c80SVlad Yasevich 12934cd57c80SVlad Yasevich 12941da177e4SLinus Torvalds /******************************************************************** 12951da177e4SLinus Torvalds * 2nd Level Abstractions 12961da177e4SLinus Torvalds ********************************************************************/ 12971da177e4SLinus Torvalds 12981da177e4SLinus Torvalds /* Turn an skb into a chunk. 12991da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13001da177e4SLinus Torvalds */ 13011da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13021da177e4SLinus Torvalds const struct sctp_association *asoc, 13031da177e4SLinus Torvalds struct sock *sk) 13041da177e4SLinus Torvalds { 13051da177e4SLinus Torvalds struct sctp_chunk *retval; 13061da177e4SLinus Torvalds 1307c3762229SRobert P. J. Day retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC); 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds if (!retval) 13101da177e4SLinus Torvalds goto nodata; 1311bb33381dSDaniel Borkmann if (!sk) 1312bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13131da177e4SLinus Torvalds 131479af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13151da177e4SLinus Torvalds retval->skb = skb; 13161da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13171da177e4SLinus Torvalds retval->has_tsn = 0; 13181da177e4SLinus Torvalds retval->has_ssn = 0; 13191da177e4SLinus Torvalds retval->rtt_in_progress = 0; 13201da177e4SLinus Torvalds retval->sent_at = 0; 13211da177e4SLinus Torvalds retval->singleton = 1; 13221da177e4SLinus Torvalds retval->end_of_packet = 0; 13231da177e4SLinus Torvalds retval->ecn_ce_done = 0; 13241da177e4SLinus Torvalds retval->pdiscard = 0; 13251da177e4SLinus Torvalds 13261da177e4SLinus Torvalds /* sctpimpguide-05.txt Section 2.8.2 13271da177e4SLinus Torvalds * M1) Each time a new DATA chunk is transmitted 13281da177e4SLinus Torvalds * set the 'TSN.Missing.Report' count for that TSN to 0. The 13291da177e4SLinus Torvalds * 'TSN.Missing.Report' count will be used to determine missing chunks 13301da177e4SLinus Torvalds * and when to fast retransmit. 13311da177e4SLinus Torvalds */ 13321da177e4SLinus Torvalds retval->tsn_missing_report = 0; 13331da177e4SLinus Torvalds retval->tsn_gap_acked = 0; 1334c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13351da177e4SLinus Torvalds 13361da177e4SLinus Torvalds /* If this is a fragmented message, track all fragments 13371da177e4SLinus Torvalds * of the message (for SEND_FAILED). 13381da177e4SLinus Torvalds */ 13391da177e4SLinus Torvalds retval->msg = NULL; 13401da177e4SLinus Torvalds 13411da177e4SLinus Torvalds /* Polish the bead hole. */ 13421da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13431da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13441da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 13451da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 13461da177e4SLinus Torvalds 13471da177e4SLinus Torvalds nodata: 13481da177e4SLinus Torvalds return retval; 13491da177e4SLinus Torvalds } 13501da177e4SLinus Torvalds 13511da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13521da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13531da177e4SLinus Torvalds union sctp_addr *dest) 13541da177e4SLinus Torvalds { 1355f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 135616b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13571da177e4SLinus Torvalds } 13581da177e4SLinus Torvalds 13591da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13601da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13611da177e4SLinus Torvalds { 13621da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13631da177e4SLinus Torvalds if (chunk->transport) { 13646a1e5f33SAl Viro return &chunk->transport->ipaddr; 13651da177e4SLinus Torvalds } else { 13661da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13676a1e5f33SAl Viro return &chunk->source; 13681da177e4SLinus Torvalds } 13691da177e4SLinus Torvalds } 13701da177e4SLinus Torvalds 13711da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13721da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13731da177e4SLinus Torvalds */ 1374072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 13751da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen) 13761da177e4SLinus Torvalds { 13771da177e4SLinus Torvalds struct sctp_chunk *retval; 13781da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 13791da177e4SLinus Torvalds struct sk_buff *skb; 13801da177e4SLinus Torvalds struct sock *sk; 13811da177e4SLinus Torvalds 13821da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 13831da177e4SLinus Torvalds skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), 13841da177e4SLinus Torvalds GFP_ATOMIC); 13851da177e4SLinus Torvalds if (!skb) 13861da177e4SLinus Torvalds goto nodata; 13871da177e4SLinus Torvalds 13881da177e4SLinus Torvalds /* Make room for the chunk header. */ 13891da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 13901da177e4SLinus Torvalds chunk_hdr->type = type; 13911da177e4SLinus Torvalds chunk_hdr->flags = flags; 13921da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 13931da177e4SLinus Torvalds 13941da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 13951da177e4SLinus Torvalds retval = sctp_chunkify(skb, asoc, sk); 13961da177e4SLinus Torvalds if (!retval) { 13971da177e4SLinus Torvalds kfree_skb(skb); 13981da177e4SLinus Torvalds goto nodata; 13991da177e4SLinus Torvalds } 14001da177e4SLinus Torvalds 14011da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 14021da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 14031da177e4SLinus Torvalds 14044cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 14054cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 14064cd57c80SVlad Yasevich retval->auth = 1; 14074cd57c80SVlad Yasevich 14081da177e4SLinus Torvalds return retval; 14091da177e4SLinus Torvalds nodata: 14101da177e4SLinus Torvalds return NULL; 14111da177e4SLinus Torvalds } 14121da177e4SLinus Torvalds 1413072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1414072017b4SVlad Yasevich __u8 flags, int paylen) 1415072017b4SVlad Yasevich { 1416072017b4SVlad Yasevich return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen); 1417072017b4SVlad Yasevich } 1418072017b4SVlad Yasevich 1419072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1420072017b4SVlad Yasevich __u8 type, __u8 flags, int paylen) 1421072017b4SVlad Yasevich { 1422072017b4SVlad Yasevich struct sctp_chunk *chunk = _sctp_make_chunk(asoc, type, flags, paylen); 1423072017b4SVlad Yasevich 1424072017b4SVlad Yasevich if (chunk) 1425072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1426072017b4SVlad Yasevich 1427072017b4SVlad Yasevich return chunk; 1428072017b4SVlad Yasevich } 14291da177e4SLinus Torvalds 14301da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14311da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14321da177e4SLinus Torvalds { 1433a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1434a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1435a08de64dSVlad Yasevich 14361da177e4SLinus Torvalds /* Free the chunk skb data and the SCTP_chunk stub itself. */ 14371da177e4SLinus Torvalds dev_kfree_skb(chunk->skb); 14381da177e4SLinus Torvalds 14391da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 14401da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 14411da177e4SLinus Torvalds } 14421da177e4SLinus Torvalds 14431da177e4SLinus Torvalds /* Possibly, free the chunk. */ 14441da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 14451da177e4SLinus Torvalds { 14461da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 14471da177e4SLinus Torvalds if (chunk->msg) 14481da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 14491da177e4SLinus Torvalds 14501da177e4SLinus Torvalds sctp_chunk_put(chunk); 14511da177e4SLinus Torvalds } 14521da177e4SLinus Torvalds 14531da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14541da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14551da177e4SLinus Torvalds { 14561da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 14571da177e4SLinus Torvalds } 14581da177e4SLinus Torvalds 14591da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14601da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14611da177e4SLinus Torvalds { 14621da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 14631da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14641da177e4SLinus Torvalds } 14651da177e4SLinus Torvalds 14661da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14671da177e4SLinus Torvalds * enough. 14681da177e4SLinus Torvalds */ 14691da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14701da177e4SLinus Torvalds { 14711da177e4SLinus Torvalds void *target; 14721da177e4SLinus Torvalds void *padding; 14731da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 14748d614adeSWei Yongjun int padlen = WORD_ROUND(chunklen) - chunklen; 14751da177e4SLinus Torvalds 14761da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 14771da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14781da177e4SLinus Torvalds 14791da177e4SLinus Torvalds memset(padding, 0, padlen); 14801da177e4SLinus Torvalds memcpy(target, data, len); 14811da177e4SLinus Torvalds 14821da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14831da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 148427a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14851da177e4SLinus Torvalds 14861da177e4SLinus Torvalds return target; 14871da177e4SLinus Torvalds } 14881da177e4SLinus Torvalds 14895fa782c2SNeil Horman /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient 14905fa782c2SNeil Horman * space in the chunk 14915fa782c2SNeil Horman */ 14925fa782c2SNeil Horman void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, 14935fa782c2SNeil Horman int len, const void *data) 14945fa782c2SNeil Horman { 14952e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) >= len) 14965fa782c2SNeil Horman return sctp_addto_chunk(chunk, len, data); 14975fa782c2SNeil Horman else 14985fa782c2SNeil Horman return NULL; 14995fa782c2SNeil Horman } 15005fa782c2SNeil Horman 15011da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 15021da177e4SLinus Torvalds * chunk is not big enough. 15031da177e4SLinus Torvalds * Returns a kernel err value. 15041da177e4SLinus Torvalds */ 15051da177e4SLinus Torvalds int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 15061da177e4SLinus Torvalds struct iovec *data) 15071da177e4SLinus Torvalds { 15081da177e4SLinus Torvalds __u8 *target; 15091da177e4SLinus Torvalds int err = 0; 15101da177e4SLinus Torvalds 15111da177e4SLinus Torvalds /* Make room in chunk for data. */ 15121da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15131da177e4SLinus Torvalds 15141da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 15151da177e4SLinus Torvalds if ((err = memcpy_fromiovecend(target, data, off, len))) 15161da177e4SLinus Torvalds goto out; 15171da177e4SLinus Torvalds 15181da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15191da177e4SLinus Torvalds chunk->chunk_hdr->length = 15201da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 152127a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15221da177e4SLinus Torvalds 15231da177e4SLinus Torvalds out: 15241da177e4SLinus Torvalds return err; 15251da177e4SLinus Torvalds } 15261da177e4SLinus Torvalds 15271da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15281da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15291da177e4SLinus Torvalds */ 15301da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15311da177e4SLinus Torvalds { 1532ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1533ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1534ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 15351da177e4SLinus Torvalds __u16 ssn; 15361da177e4SLinus Torvalds __u16 sid; 15371da177e4SLinus Torvalds 15381da177e4SLinus Torvalds if (chunk->has_ssn) 15391da177e4SLinus Torvalds return; 15401da177e4SLinus Torvalds 1541ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1542ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1543ab3e5e7bSVlad Yasevich stream = &chunk->asoc->ssnmap->out; 1544ab3e5e7bSVlad Yasevich 1545ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1546ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1547ab3e5e7bSVlad Yasevich */ 1548ab3e5e7bSVlad Yasevich msg = chunk->msg; 1549ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1550ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15511da177e4SLinus Torvalds ssn = 0; 15521da177e4SLinus Torvalds } else { 1553ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1554ab3e5e7bSVlad Yasevich ssn = sctp_ssn_next(stream, sid); 15551da177e4SLinus Torvalds else 1556ab3e5e7bSVlad Yasevich ssn = sctp_ssn_peek(stream, sid); 15571da177e4SLinus Torvalds } 15581da177e4SLinus Torvalds 1559ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1560ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1561ab3e5e7bSVlad Yasevich } 15621da177e4SLinus Torvalds } 15631da177e4SLinus Torvalds 15641da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15651da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15661da177e4SLinus Torvalds */ 15671da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15681da177e4SLinus Torvalds { 15691da177e4SLinus Torvalds if (!chunk->has_tsn) { 15701da177e4SLinus Torvalds /* This is the last possible instant to 15711da177e4SLinus Torvalds * assign a TSN. 15721da177e4SLinus Torvalds */ 15731da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15741da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15751da177e4SLinus Torvalds chunk->has_tsn = 1; 15761da177e4SLinus Torvalds } 15771da177e4SLinus Torvalds } 15781da177e4SLinus Torvalds 15791da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15801da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15813182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1582dd0fc66fSAl Viro gfp_t gfp) 15831da177e4SLinus Torvalds { 15841da177e4SLinus Torvalds struct sctp_association *asoc; 15851da177e4SLinus Torvalds struct sk_buff *skb; 15861da177e4SLinus Torvalds sctp_scope_t scope; 15871da177e4SLinus Torvalds struct sctp_af *af; 15881da177e4SLinus Torvalds 15891da177e4SLinus Torvalds /* Create the bare association. */ 15901da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15911da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15921da177e4SLinus Torvalds if (!asoc) 15931da177e4SLinus Torvalds goto nodata; 15941da177e4SLinus Torvalds asoc->temp = 1; 15951da177e4SLinus Torvalds skb = chunk->skb; 15961da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1597eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); 15981da177e4SLinus Torvalds if (unlikely(!af)) 15991da177e4SLinus Torvalds goto fail; 1600d55c41b1SAl Viro af->from_skb(&asoc->c.peer_addr, skb, 1); 16011da177e4SLinus Torvalds nodata: 16021da177e4SLinus Torvalds return asoc; 16031da177e4SLinus Torvalds 16041da177e4SLinus Torvalds fail: 16051da177e4SLinus Torvalds sctp_association_free(asoc); 16061da177e4SLinus Torvalds return NULL; 16071da177e4SLinus Torvalds } 16081da177e4SLinus Torvalds 16091da177e4SLinus Torvalds /* Build a cookie representing asoc. 16101da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 16111da177e4SLinus Torvalds */ 16121da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 16131da177e4SLinus Torvalds const struct sctp_association *asoc, 16141da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 16151da177e4SLinus Torvalds int *cookie_len, 16161da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 16171da177e4SLinus Torvalds { 16181da177e4SLinus Torvalds sctp_cookie_param_t *retval; 16191da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 16201da177e4SLinus Torvalds struct scatterlist sg; 16211da177e4SLinus Torvalds int headersize, bodysize; 16221da177e4SLinus Torvalds 16239834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16249834a2bbSVlad Yasevich * any padding. 16259834a2bbSVlad Yasevich */ 16269834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 16279834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16289834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16291da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16301da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16311da177e4SLinus Torvalds 16321da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16331da177e4SLinus Torvalds * functions simpler to write. 16341da177e4SLinus Torvalds */ 16351da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16361da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16371da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16381da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16391da177e4SLinus Torvalds 16401da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16411da177e4SLinus Torvalds * out on the network. 16421da177e4SLinus Torvalds */ 1643af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1644af997d8cSArnaldo Carvalho de Melo if (!retval) 1645af997d8cSArnaldo Carvalho de Melo goto nodata; 1646af997d8cSArnaldo Carvalho de Melo 16471da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16481da177e4SLinus Torvalds 16491da177e4SLinus Torvalds /* Set up the parameter header. */ 16501da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16511da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16521da177e4SLinus Torvalds 16531da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16541da177e4SLinus Torvalds cookie->c = asoc->c; 16551da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16561da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16571da177e4SLinus Torvalds 16581da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16591da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16601da177e4SLinus Torvalds 16610f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16620f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16631da177e4SLinus Torvalds 16641da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 166552db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 166652db882fSDaniel Borkmann ktime_get()); 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16691da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16701da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16711da177e4SLinus Torvalds 16721da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16731da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16741da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16751da177e4SLinus Torvalds 16761da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16771b489e11SHerbert Xu struct hash_desc desc; 16781b489e11SHerbert Xu 16791da177e4SLinus Torvalds /* Sign the message. */ 168068e3f5ddSHerbert Xu sg_init_one(&sg, &cookie->c, bodysize); 16811b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 16821b489e11SHerbert Xu desc.flags = 0; 16831da177e4SLinus Torvalds 1684570617e7SDaniel Borkmann if (crypto_hash_setkey(desc.tfm, ep->secret_key, 1685570617e7SDaniel Borkmann sizeof(ep->secret_key)) || 16861b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) 16871b489e11SHerbert Xu goto free_cookie; 16881da177e4SLinus Torvalds } 16891da177e4SLinus Torvalds 16901da177e4SLinus Torvalds return retval; 16911b489e11SHerbert Xu 16921b489e11SHerbert Xu free_cookie: 16931b489e11SHerbert Xu kfree(retval); 16941b489e11SHerbert Xu nodata: 16951b489e11SHerbert Xu *cookie_len = 0; 16961b489e11SHerbert Xu return NULL; 16971da177e4SLinus Torvalds } 16981da177e4SLinus Torvalds 16991da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 17001da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 17011da177e4SLinus Torvalds const struct sctp_endpoint *ep, 17021da177e4SLinus Torvalds const struct sctp_association *asoc, 1703dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 17041da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 17051da177e4SLinus Torvalds { 17061da177e4SLinus Torvalds struct sctp_association *retval = NULL; 17071da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 17081da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 17091da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1710313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 17111da177e4SLinus Torvalds struct scatterlist sg; 1712570617e7SDaniel Borkmann unsigned int len; 17131da177e4SLinus Torvalds sctp_scope_t scope; 17141da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 171552db882fSDaniel Borkmann ktime_t kt; 17161b489e11SHerbert Xu struct hash_desc desc; 17171da177e4SLinus Torvalds 17189834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17199834a2bbSVlad Yasevich * any padding. 17209834a2bbSVlad Yasevich */ 17219834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 17229834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17239834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17241da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17251da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17261da177e4SLinus Torvalds 17271da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17281da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17291da177e4SLinus Torvalds * INIT chunk. 17301da177e4SLinus Torvalds */ 17311da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17321da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17331da177e4SLinus Torvalds goto malformed; 17341da177e4SLinus Torvalds 17351da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17361da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17371da177e4SLinus Torvalds goto malformed; 17381da177e4SLinus Torvalds 17391da177e4SLinus Torvalds /* Process the cookie. */ 17401da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17411da177e4SLinus Torvalds bear_cookie = &cookie->c; 17421da177e4SLinus Torvalds 17431da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17441da177e4SLinus Torvalds goto no_hmac; 17451da177e4SLinus Torvalds 17461da177e4SLinus Torvalds /* Check the signature. */ 174768e3f5ddSHerbert Xu sg_init_one(&sg, bear_cookie, bodysize); 17481b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 17491b489e11SHerbert Xu desc.flags = 0; 17501da177e4SLinus Torvalds 17518ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 1752570617e7SDaniel Borkmann if (crypto_hash_setkey(desc.tfm, ep->secret_key, 1753570617e7SDaniel Borkmann sizeof(ep->secret_key)) || 17541b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 17551b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17561b489e11SHerbert Xu goto fail; 17571b489e11SHerbert Xu } 17581da177e4SLinus Torvalds 17591da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17601da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17611da177e4SLinus Torvalds goto fail; 17621da177e4SLinus Torvalds } 17631da177e4SLinus Torvalds 17641da177e4SLinus Torvalds no_hmac: 17651da177e4SLinus Torvalds /* IG Section 2.35.2: 17661da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17671da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17681da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17691da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17701da177e4SLinus Torvalds * discarded, 17711da177e4SLinus Torvalds */ 17721da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17731da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17741da177e4SLinus Torvalds goto fail; 17751da177e4SLinus Torvalds } 17761da177e4SLinus Torvalds 17779b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17781da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17791da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17801da177e4SLinus Torvalds goto fail; 17811da177e4SLinus Torvalds } 17821da177e4SLinus Torvalds 17831da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17841da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17851da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1786f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1787f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1788f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1789f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17901da177e4SLinus Torvalds */ 1791f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 179252db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1793f236218bSVlad Yasevich else 179452db882fSDaniel Borkmann kt = ktime_get(); 1795f236218bSVlad Yasevich 179652db882fSDaniel Borkmann if (!asoc && ktime_compare(bear_cookie->expiration, kt) < 0) { 17971da177e4SLinus Torvalds /* 17981da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 17991da177e4SLinus Torvalds * 18001da177e4SLinus Torvalds * Cause of error 18011da177e4SLinus Torvalds * --------------- 18021da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 18031da177e4SLinus Torvalds * Cookie that has expired. 18041da177e4SLinus Torvalds */ 18051da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 18061da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18071da177e4SLinus Torvalds if (*errp) { 180852db882fSDaniel Borkmann suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 180934bcca28SAl Viro __be32 n = htonl(usecs); 18101da177e4SLinus Torvalds 18111da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 181200f1c2dfSWei Yongjun sizeof(n)); 181300f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 18141da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18151da177e4SLinus Torvalds } else 18161da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18171da177e4SLinus Torvalds 18181da177e4SLinus Torvalds goto fail; 18191da177e4SLinus Torvalds } 18201da177e4SLinus Torvalds 18211da177e4SLinus Torvalds /* Make a new base association. */ 18221da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18231da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18241da177e4SLinus Torvalds if (!retval) { 18251da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18261da177e4SLinus Torvalds goto fail; 18271da177e4SLinus Torvalds } 18281da177e4SLinus Torvalds 18291da177e4SLinus Torvalds /* Set up our peer's port number. */ 18301da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18311da177e4SLinus Torvalds 18321da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18331da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18341da177e4SLinus Torvalds 18351da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18361da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18371da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18381da177e4SLinus Torvalds goto fail; 18391da177e4SLinus Torvalds } 18401da177e4SLinus Torvalds 18411da177e4SLinus Torvalds /* Also, add the destination address. */ 18421da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1843f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1844f57d96b2SVlad Yasevich SCTP_ADDR_SRC, GFP_ATOMIC); 18451da177e4SLinus Torvalds } 18461da177e4SLinus Torvalds 18471da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18481da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18491da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 18501da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18511da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18520f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18531da177e4SLinus Torvalds 18541da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18551da177e4SLinus Torvalds return retval; 18561da177e4SLinus Torvalds 18571da177e4SLinus Torvalds fail: 18581da177e4SLinus Torvalds if (retval) 18591da177e4SLinus Torvalds sctp_association_free(retval); 18601da177e4SLinus Torvalds 18611da177e4SLinus Torvalds return NULL; 18621da177e4SLinus Torvalds 18631da177e4SLinus Torvalds malformed: 18641da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18651da177e4SLinus Torvalds * malformed. 18661da177e4SLinus Torvalds */ 18671da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18681da177e4SLinus Torvalds goto fail; 18691da177e4SLinus Torvalds } 18701da177e4SLinus Torvalds 18711da177e4SLinus Torvalds /******************************************************************** 18721da177e4SLinus Torvalds * 3rd Level Abstractions 18731da177e4SLinus Torvalds ********************************************************************/ 18741da177e4SLinus Torvalds 18751da177e4SLinus Torvalds struct __sctp_missing { 18769f81bcd9SAl Viro __be32 num_missing; 18779f81bcd9SAl Viro __be16 type; 1878bc10502dSEric Dumazet } __packed; 18791da177e4SLinus Torvalds 18801da177e4SLinus Torvalds /* 18811da177e4SLinus Torvalds * Report a missing mandatory parameter. 18821da177e4SLinus Torvalds */ 18831da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 18841da177e4SLinus Torvalds sctp_param_t paramtype, 18851da177e4SLinus Torvalds struct sctp_chunk *chunk, 18861da177e4SLinus Torvalds struct sctp_chunk **errp) 18871da177e4SLinus Torvalds { 18881da177e4SLinus Torvalds struct __sctp_missing report; 18891da177e4SLinus Torvalds __u16 len; 18901da177e4SLinus Torvalds 18911da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 18921da177e4SLinus Torvalds 18931da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 18941da177e4SLinus Torvalds * returning multiple unknown parameters. 18951da177e4SLinus Torvalds */ 18961da177e4SLinus Torvalds if (!*errp) 18971da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18981da177e4SLinus Torvalds 18991da177e4SLinus Torvalds if (*errp) { 19001da177e4SLinus Torvalds report.num_missing = htonl(1); 19011da177e4SLinus Torvalds report.type = paramtype; 1902ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 190300f1c2dfSWei Yongjun sizeof(report)); 190400f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 19051da177e4SLinus Torvalds } 19061da177e4SLinus Torvalds 19071da177e4SLinus Torvalds /* Stop processing this chunk. */ 19081da177e4SLinus Torvalds return 0; 19091da177e4SLinus Torvalds } 19101da177e4SLinus Torvalds 19111da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19121da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19131da177e4SLinus Torvalds struct sctp_chunk *chunk, 19141da177e4SLinus Torvalds struct sctp_chunk **errp) 19151da177e4SLinus Torvalds { 19161da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19171da177e4SLinus Torvalds 19181da177e4SLinus Torvalds if (!*errp) 19191da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19201da177e4SLinus Torvalds 19211da177e4SLinus Torvalds if (*errp) 192200f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19231da177e4SLinus Torvalds 19241da177e4SLinus Torvalds /* Stop processing this chunk. */ 19251da177e4SLinus Torvalds return 0; 19261da177e4SLinus Torvalds } 19271da177e4SLinus Torvalds 19281da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19291da177e4SLinus Torvalds struct sctp_paramhdr *param, 19301da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19311da177e4SLinus Torvalds struct sctp_chunk **errp) 19321da177e4SLinus Torvalds { 19337ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19347ab90804SVlad Yasevich * not reported. 19357ab90804SVlad Yasevich */ 19367ab90804SVlad Yasevich if (*errp) 19377ab90804SVlad Yasevich sctp_chunk_free(*errp); 19387ab90804SVlad Yasevich 19391da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1940ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19411da177e4SLinus Torvalds 19421da177e4SLinus Torvalds return 0; 19431da177e4SLinus Torvalds } 19441da177e4SLinus Torvalds 19451da177e4SLinus Torvalds 19461da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19471da177e4SLinus Torvalds * send back an indicator to the peer. 19481da177e4SLinus Torvalds */ 19491da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19501da177e4SLinus Torvalds union sctp_params param, 19511da177e4SLinus Torvalds struct sctp_chunk *chunk, 19521da177e4SLinus Torvalds struct sctp_chunk **errp) 19531da177e4SLinus Torvalds { 19541da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19551da177e4SLinus Torvalds 19567ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19577ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19587ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19597ab90804SVlad Yasevich * them in the ABORT. 19607ab90804SVlad Yasevich */ 19617ab90804SVlad Yasevich if (*errp) 19627ab90804SVlad Yasevich sctp_chunk_free(*errp); 19637ab90804SVlad Yasevich 19641da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19651da177e4SLinus Torvalds 196600f1c2dfSWei Yongjun if (*errp) { 196700f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 196800f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 196900f1c2dfSWei Yongjun } 19701da177e4SLinus Torvalds 19711da177e4SLinus Torvalds /* Stop processing this chunk. */ 19721da177e4SLinus Torvalds return 0; 19731da177e4SLinus Torvalds } 19741da177e4SLinus Torvalds 1975f53b5b09SEric W. Biederman static int sctp_verify_ext_param(struct net *net, union sctp_params param) 1976d6701191SVlad Yasevich { 1977d6701191SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1978d6701191SVlad Yasevich int have_auth = 0; 1979d6701191SVlad Yasevich int have_asconf = 0; 1980d6701191SVlad Yasevich int i; 1981d6701191SVlad Yasevich 1982d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1983d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1984d6701191SVlad Yasevich case SCTP_CID_AUTH: 1985d6701191SVlad Yasevich have_auth = 1; 1986d6701191SVlad Yasevich break; 1987d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1988d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1989d6701191SVlad Yasevich have_asconf = 1; 1990d6701191SVlad Yasevich break; 1991d6701191SVlad Yasevich } 1992d6701191SVlad Yasevich } 1993d6701191SVlad Yasevich 1994d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1995d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 1996d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 1997d6701191SVlad Yasevich * mode. 1998d6701191SVlad Yasevich */ 1999e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 2000d6701191SVlad Yasevich return 1; 2001d6701191SVlad Yasevich 2002e1fc3b14SEric W. Biederman if (net->sctp.addip_enable && !have_auth && have_asconf) 2003d6701191SVlad Yasevich return 0; 2004d6701191SVlad Yasevich 2005d6701191SVlad Yasevich return 1; 2006d6701191SVlad Yasevich } 2007d6701191SVlad Yasevich 2008131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 2009131a47e3SVlad Yasevich union sctp_params param) 2010131a47e3SVlad Yasevich { 2011e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2012131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 2013131a47e3SVlad Yasevich int i; 2014131a47e3SVlad Yasevich 2015131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2016131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2017131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 2018e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable && 2019131a47e3SVlad Yasevich !asoc->peer.prsctp_capable) 2020131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2021131a47e3SVlad Yasevich break; 2022730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2023730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2024730fc3d0SVlad Yasevich * supports AUTH. 2025730fc3d0SVlad Yasevich */ 2026e1fc3b14SEric W. Biederman if (net->sctp.auth_enable) 2027730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2028730fc3d0SVlad Yasevich break; 2029131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2030131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2031e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 203288799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20336b2f9cb6SVlad Yasevich break; 2034131a47e3SVlad Yasevich default: 2035131a47e3SVlad Yasevich break; 2036131a47e3SVlad Yasevich } 2037131a47e3SVlad Yasevich } 2038131a47e3SVlad Yasevich } 2039131a47e3SVlad Yasevich 20401da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20411da177e4SLinus Torvalds * 20421da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20431da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20441da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20451da177e4SLinus Torvalds * Parameter Type. 20461da177e4SLinus Torvalds * 20477ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20487ab90804SVlad Yasevich * parameters within this chunk 20491da177e4SLinus Torvalds * 20507ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20517ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20527ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20531da177e4SLinus Torvalds * 20541da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20551da177e4SLinus Torvalds * 20561da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20571da177e4SLinus Torvalds * report the unrecognized parameter in an 20587ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20591da177e4SLinus Torvalds * 20601da177e4SLinus Torvalds * Return value: 20617ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20627ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20637ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20641da177e4SLinus Torvalds */ 20657ab90804SVlad Yasevich static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, 20661da177e4SLinus Torvalds union sctp_params param, 20671da177e4SLinus Torvalds struct sctp_chunk *chunk, 20681da177e4SLinus Torvalds struct sctp_chunk **errp) 20691da177e4SLinus Torvalds { 20707ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20711da177e4SLinus Torvalds 20721da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20731da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20747ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20751da177e4SLinus Torvalds break; 20761da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20771da177e4SLinus Torvalds break; 20787ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20797ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20807ab90804SVlad Yasevich /* Fall through */ 20811da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20821da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20831da177e4SLinus Torvalds * returning multiple unknown parameters. 20841da177e4SLinus Torvalds */ 20851da177e4SLinus Torvalds if (NULL == *errp) 20865fa782c2SNeil Horman *errp = sctp_make_op_error_fixed(asoc, chunk); 20871da177e4SLinus Torvalds 20881da177e4SLinus Torvalds if (*errp) { 20892205a6eaSJiri Bohac if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, 20902205a6eaSJiri Bohac WORD_ROUND(ntohs(param.p->length)))) 20915fa782c2SNeil Horman sctp_addto_chunk_fixed(*errp, 209200f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 209300f1c2dfSWei Yongjun param.v); 20941da177e4SLinus Torvalds } else { 20951da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 20961da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 20971da177e4SLinus Torvalds * to the peer and the association won't be 20981da177e4SLinus Torvalds * established. 20991da177e4SLinus Torvalds */ 21007ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 21011da177e4SLinus Torvalds } 21021da177e4SLinus Torvalds break; 21031da177e4SLinus Torvalds default: 21041da177e4SLinus Torvalds break; 21051da177e4SLinus Torvalds } 21061da177e4SLinus Torvalds 21071da177e4SLinus Torvalds return retval; 21081da177e4SLinus Torvalds } 21091da177e4SLinus Torvalds 21107ab90804SVlad Yasevich /* Verify variable length parameters 21111da177e4SLinus Torvalds * Return values: 21127ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21137ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21147ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21157ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21161da177e4SLinus Torvalds */ 2117f53b5b09SEric W. Biederman static sctp_ierror_t sctp_verify_param(struct net *net, 2118f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21191da177e4SLinus Torvalds union sctp_params param, 21201da177e4SLinus Torvalds sctp_cid_t cid, 21211da177e4SLinus Torvalds struct sctp_chunk *chunk, 21221da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21231da177e4SLinus Torvalds { 212472da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21257ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 212672da7b38SWei Yongjun __u16 n_elt, id = 0; 212772da7b38SWei Yongjun int i; 21281da177e4SLinus Torvalds 21291da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21301da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21311da177e4SLinus Torvalds * identified based on the chunk id. 21321da177e4SLinus Torvalds */ 21331da177e4SLinus Torvalds 21341da177e4SLinus Torvalds switch (param.p->type) { 21351da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21361da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21371da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21381da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21391da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21401da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21411da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21421da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21430f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2144d6701191SVlad Yasevich break; 2145d6701191SVlad Yasevich 2146131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2147f53b5b09SEric W. Biederman if (!sctp_verify_ext_param(net, param)) 2148d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21491da177e4SLinus Torvalds break; 21501da177e4SLinus Torvalds 2151d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2152e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 2153d6de3097SVlad Yasevich break; 2154d6de3097SVlad Yasevich goto fallthrough; 2155d6de3097SVlad Yasevich 21561da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21571da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21587ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21597ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21607ab90804SVlad Yasevich break; 2161131a47e3SVlad Yasevich 21621da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 2163e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 21641da177e4SLinus Torvalds break; 2165730fc3d0SVlad Yasevich goto fallthrough; 2166730fc3d0SVlad Yasevich 2167730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2168e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2169730fc3d0SVlad Yasevich goto fallthrough; 2170730fc3d0SVlad Yasevich 2171730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2172730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2173730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2174730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2175730fc3d0SVlad Yasevich */ 2176730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 21777ab90804SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { 21787ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2179730fc3d0SVlad Yasevich chunk, err_chunk); 21807ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21817ab90804SVlad Yasevich } 2182730fc3d0SVlad Yasevich break; 2183730fc3d0SVlad Yasevich 2184730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2185e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2186730fc3d0SVlad Yasevich goto fallthrough; 2187730fc3d0SVlad Yasevich 2188730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2189730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2190730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2191730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2192730fc3d0SVlad Yasevich */ 21937ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 21947ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2195730fc3d0SVlad Yasevich chunk, err_chunk); 21967ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21977ab90804SVlad Yasevich } 2198730fc3d0SVlad Yasevich break; 2199730fc3d0SVlad Yasevich 2200730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2201e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 220272da7b38SWei Yongjun goto fallthrough; 220372da7b38SWei Yongjun 220472da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 220572da7b38SWei Yongjun n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; 220672da7b38SWei Yongjun 220772da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 220872da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 220972da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 221072da7b38SWei Yongjun */ 221172da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 221272da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 221372da7b38SWei Yongjun 221472da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2215730fc3d0SVlad Yasevich break; 221672da7b38SWei Yongjun } 221772da7b38SWei Yongjun 221872da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 221972da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 222072da7b38SWei Yongjun err_chunk); 222172da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 222272da7b38SWei Yongjun } 222372da7b38SWei Yongjun break; 2224730fc3d0SVlad Yasevich fallthrough: 22251da177e4SLinus Torvalds default: 2226bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2227bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2228bb33381dSDaniel Borkmann 22297ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22301da177e4SLinus Torvalds break; 22311da177e4SLinus Torvalds } 22321da177e4SLinus Torvalds return retval; 22331da177e4SLinus Torvalds } 22341da177e4SLinus Torvalds 22351da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2236f53b5b09SEric W. Biederman int sctp_verify_init(struct net *net, const struct sctp_association *asoc, 22371da177e4SLinus Torvalds sctp_cid_t cid, 22381da177e4SLinus Torvalds sctp_init_chunk_t *peer_init, 22391da177e4SLinus Torvalds struct sctp_chunk *chunk, 22401da177e4SLinus Torvalds struct sctp_chunk **errp) 22411da177e4SLinus Torvalds { 22421da177e4SLinus Torvalds union sctp_params param; 22431da177e4SLinus Torvalds int has_cookie = 0; 22447ab90804SVlad Yasevich int result; 22451da177e4SLinus Torvalds 22461da177e4SLinus Torvalds /* Verify stream values are non-zero. */ 22471da177e4SLinus Torvalds if ((0 == peer_init->init_hdr.num_outbound_streams) || 2248d023f629SVlad Yasevich (0 == peer_init->init_hdr.num_inbound_streams) || 2249d023f629SVlad Yasevich (0 == peer_init->init_hdr.init_tag) || 2250d023f629SVlad Yasevich (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) { 22511da177e4SLinus Torvalds 22527ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22531da177e4SLinus Torvalds } 22541da177e4SLinus Torvalds 22551da177e4SLinus Torvalds /* Check for missing mandatory parameters. */ 22561da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22571da177e4SLinus Torvalds 22581da177e4SLinus Torvalds if (SCTP_PARAM_STATE_COOKIE == param.p->type) 22591da177e4SLinus Torvalds has_cookie = 1; 22601da177e4SLinus Torvalds 22611da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22621da177e4SLinus Torvalds 22631da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22641da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22651da177e4SLinus Torvalds * The current param.p would point at the bad one. 22661da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22671da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22681da177e4SLinus Torvalds * error handling code build and send the packet. 22691da177e4SLinus Torvalds */ 22707ab90804SVlad Yasevich if (param.v != (void*)chunk->chunk_end) 22717ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22721da177e4SLinus Torvalds 22731da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22741da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22751da177e4SLinus Torvalds */ 22767ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22777ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22781da177e4SLinus Torvalds chunk, errp); 22791da177e4SLinus Torvalds 22807ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22811da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22821da177e4SLinus Torvalds 2283f53b5b09SEric W. Biederman result = sctp_verify_param(net, asoc, param, cid, chunk, errp); 22847ab90804SVlad Yasevich switch (result) { 22857ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22867ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22871da177e4SLinus Torvalds return 0; 22887ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 22891da177e4SLinus Torvalds return 1; 22907ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 22917ab90804SVlad Yasevich default: 22927ab90804SVlad Yasevich break; 22931da177e4SLinus Torvalds } 22941da177e4SLinus Torvalds 22951da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22961da177e4SLinus Torvalds 22971da177e4SLinus Torvalds return 1; 22981da177e4SLinus Torvalds } 22991da177e4SLinus Torvalds 23001da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 23011da177e4SLinus Torvalds * Returns 0 on failure, else success. 23021da177e4SLinus Torvalds * FIXME: This is an association method. 23031da177e4SLinus Torvalds */ 2304de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 23051da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2306dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 23071da177e4SLinus Torvalds { 2308e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 23091da177e4SLinus Torvalds union sctp_params param; 23101da177e4SLinus Torvalds struct sctp_transport *transport; 23111da177e4SLinus Torvalds struct list_head *pos, *temp; 2312de6becdcSWei Yongjun struct sctp_af *af; 2313de6becdcSWei Yongjun union sctp_addr addr; 23141da177e4SLinus Torvalds char *cookie; 2315de6becdcSWei Yongjun int src_match = 0; 23161da177e4SLinus Torvalds 23171da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23181da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23191da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23201da177e4SLinus Torvalds * of the INIT from the cookie. 23211da177e4SLinus Torvalds */ 23221da177e4SLinus Torvalds 23231da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23241da177e4SLinus Torvalds * added as the primary transport. The source address seems to 23251da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 23261da177e4SLinus Torvalds */ 23276a1e5f33SAl Viro if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23281da177e4SLinus Torvalds goto nomem; 2329de6becdcSWei Yongjun 2330de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2331de6becdcSWei Yongjun src_match = 1; 23321da177e4SLinus Torvalds 23331da177e4SLinus Torvalds /* Process the initialization parameters. */ 23341da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2335de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2336de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2337de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2338de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2339de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2340de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2341de6becdcSWei Yongjun src_match = 1; 2342de6becdcSWei Yongjun } 23431da177e4SLinus Torvalds 23441da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23451da177e4SLinus Torvalds goto clean_up; 23461da177e4SLinus Torvalds } 23471da177e4SLinus Torvalds 2348de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2349de6becdcSWei Yongjun if (!src_match) 2350de6becdcSWei Yongjun goto clean_up; 2351de6becdcSWei Yongjun 2352730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2353730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2354730fc3d0SVlad Yasevich */ 2355730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2356730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2357730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2358730fc3d0SVlad Yasevich 2359d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2360d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2361d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2362d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2363d6701191SVlad Yasevich * is what we'll do here. 23646b2f9cb6SVlad Yasevich */ 2365e1fc3b14SEric W. Biederman if (!net->sctp.addip_noauth && 236673d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23676b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23686b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23696b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 237088799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2371d6701191SVlad Yasevich goto clean_up; 23726b2f9cb6SVlad Yasevich } 23736b2f9cb6SVlad Yasevich 23743f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23753f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23763f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23773f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23783f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23793f7a87d2SFrank Filz } 23803f7a87d2SFrank Filz } 23813f7a87d2SFrank Filz 23821da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23831da177e4SLinus Torvalds * order. 23841da177e4SLinus Torvalds */ 23851da177e4SLinus Torvalds asoc->peer.i.init_tag = 23861da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23871da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 23881da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 23891da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 23901da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23911da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 23921da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23931da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 23941da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 23951da177e4SLinus Torvalds 23961da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 23971da177e4SLinus Torvalds * number of inbound streams. 23981da177e4SLinus Torvalds */ 23991da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 24001da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 24011da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 24021da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24031da177e4SLinus Torvalds } 24041da177e4SLinus Torvalds 24051da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 24061da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 24071da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 24081da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24091da177e4SLinus Torvalds } 24101da177e4SLinus Torvalds 24111da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 24121da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 24131da177e4SLinus Torvalds 24141da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24151da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24161da177e4SLinus Torvalds 24171da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 24181da177e4SLinus Torvalds cookie = asoc->peer.cookie; 24191da177e4SLinus Torvalds if (cookie) { 2420af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 24211da177e4SLinus Torvalds if (!asoc->peer.cookie) 24221da177e4SLinus Torvalds goto clean_up; 24231da177e4SLinus Torvalds } 24241da177e4SLinus Torvalds 24251da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24261da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24271da177e4SLinus Torvalds * advertised window). 24281da177e4SLinus Torvalds */ 24299dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24309dbc15f0SRobert P. J. Day transports) { 24311da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24321da177e4SLinus Torvalds } 24331da177e4SLinus Torvalds 24341da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24358e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24368e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24378e1ee18cSVlad Yasevich goto clean_up; 24381da177e4SLinus Torvalds 24391da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24401da177e4SLinus Torvalds * 24411da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24421da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24431da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24441da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24451da177e4SLinus Torvalds */ 24461da177e4SLinus Torvalds 24473f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 24483f7a87d2SFrank Filz * association. 24491da177e4SLinus Torvalds */ 24501da177e4SLinus Torvalds if (!asoc->temp) { 24511da177e4SLinus Torvalds int error; 24521da177e4SLinus Torvalds 24531da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 24541da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 24551da177e4SLinus Torvalds if (!asoc->ssnmap) 24561da177e4SLinus Torvalds goto clean_up; 24571da177e4SLinus Torvalds 245807d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 245907d93967SVlad Yasevich if (error) 24601da177e4SLinus Torvalds goto clean_up; 24611da177e4SLinus Torvalds } 24621da177e4SLinus Torvalds 24631da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24641da177e4SLinus Torvalds * 24651da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24661da177e4SLinus Torvalds * remote endpoint it should do the following: 24671da177e4SLinus Torvalds * ... 24681da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24691da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24701da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24711da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24721da177e4SLinus Torvalds */ 24731da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24741da177e4SLinus Torvalds return 1; 24751da177e4SLinus Torvalds 24761da177e4SLinus Torvalds clean_up: 24771da177e4SLinus Torvalds /* Release the transport structures. */ 24781da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24791da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2480add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2481add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24821da177e4SLinus Torvalds } 24833f7a87d2SFrank Filz 24841da177e4SLinus Torvalds nomem: 24851da177e4SLinus Torvalds return 0; 24861da177e4SLinus Torvalds } 24871da177e4SLinus Torvalds 24881da177e4SLinus Torvalds 24891da177e4SLinus Torvalds /* Update asoc with the option described in param. 24901da177e4SLinus Torvalds * 24911da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 24921da177e4SLinus Torvalds * 24931da177e4SLinus Torvalds * asoc is the association to update. 24941da177e4SLinus Torvalds * param is the variable length parameter to use for update. 24951da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 24961da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 24971da177e4SLinus Torvalds * work we do. In particular, we should not build transport 24981da177e4SLinus Torvalds * structures for the addresses. 24991da177e4SLinus Torvalds */ 25001da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 25011da177e4SLinus Torvalds union sctp_params param, 25021da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2503dd0fc66fSAl Viro gfp_t gfp) 25041da177e4SLinus Torvalds { 2505e7ff4a70SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 25061da177e4SLinus Torvalds union sctp_addr addr; 25071da177e4SLinus Torvalds int i; 25081da177e4SLinus Torvalds __u16 sat; 25091da177e4SLinus Torvalds int retval = 1; 25101da177e4SLinus Torvalds sctp_scope_t scope; 25111da177e4SLinus Torvalds time_t stale; 25121da177e4SLinus Torvalds struct sctp_af *af; 2513d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2514d6de3097SVlad Yasevich struct sctp_transport *t; 25151da177e4SLinus Torvalds 25161da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25171da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25181da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25191da177e4SLinus Torvalds */ 25201da177e4SLinus Torvalds switch (param.p->type) { 25211da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25221da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25231da177e4SLinus Torvalds break; 25247dab83deSVlad Yasevich goto do_addr_param; 25257dab83deSVlad Yasevich 25261da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25277dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25287dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25297dab83deSVlad Yasevich break; 25307dab83deSVlad Yasevich do_addr_param: 25311da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2532dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25331da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2534e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2535dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25361da177e4SLinus Torvalds return 0; 25371da177e4SLinus Torvalds break; 25381da177e4SLinus Torvalds 25391da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2540e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25411da177e4SLinus Torvalds break; 25421da177e4SLinus Torvalds 25431da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25441da177e4SLinus Torvalds 25451da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25461da177e4SLinus Torvalds * (1/1000sec). 25471da177e4SLinus Torvalds */ 254852db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25491da177e4SLinus Torvalds break; 25501da177e4SLinus Torvalds 25511da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2552bb33381dSDaniel Borkmann pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); 25531da177e4SLinus Torvalds break; 25541da177e4SLinus Torvalds 25551da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25561da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25571da177e4SLinus Torvalds * ones are really set by the peer. 25581da177e4SLinus Torvalds */ 25591da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25601da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25611da177e4SLinus Torvalds 2562140ee960SGui Jianfeng /* Assume that peer supports the address family 2563140ee960SGui Jianfeng * by which it sends a packet. 2564140ee960SGui Jianfeng */ 2565140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2566140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2567140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2568140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2569140ee960SGui Jianfeng 25701da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25711da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25721da177e4SLinus Torvalds if (sat) 25731da177e4SLinus Torvalds sat /= sizeof(__u16); 25741da177e4SLinus Torvalds 25751da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25761da177e4SLinus Torvalds switch (param.sat->types[i]) { 25771da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25781da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25791da177e4SLinus Torvalds break; 25801da177e4SLinus Torvalds 25811da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25826e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25831da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25841da177e4SLinus Torvalds break; 25851da177e4SLinus Torvalds 25861da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25871da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25881da177e4SLinus Torvalds break; 25891da177e4SLinus Torvalds 25901da177e4SLinus Torvalds default: /* Just ignore anything else. */ 25911da177e4SLinus Torvalds break; 25923ff50b79SStephen Hemminger } 25931da177e4SLinus Torvalds } 25941da177e4SLinus Torvalds break; 25951da177e4SLinus Torvalds 25961da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 25971da177e4SLinus Torvalds asoc->peer.cookie_len = 25981da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25991da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 26001da177e4SLinus Torvalds break; 26011da177e4SLinus Torvalds 26021da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 26031da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 26041da177e4SLinus Torvalds break; 26051da177e4SLinus Torvalds 26061da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 26071da177e4SLinus Torvalds /* Rejected during verify stage. */ 26081da177e4SLinus Torvalds break; 26091da177e4SLinus Torvalds 26101da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 26111da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 26121da177e4SLinus Torvalds break; 26131da177e4SLinus Torvalds 26140f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2615e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26161da177e4SLinus Torvalds break; 26171da177e4SLinus Torvalds 2618d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2619e1fc3b14SEric W. Biederman if (!net->sctp.addip_enable) 26200ef46e28SVlad Yasevich goto fall_through; 26210ef46e28SVlad Yasevich 2622d6de3097SVlad Yasevich addr_param = param.v + sizeof(sctp_addip_param_t); 2623d6de3097SVlad Yasevich 2624d6de3097SVlad Yasevich af = sctp_get_af_specific(param_type2af(param.p->type)); 2625d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2626d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2627d6de3097SVlad Yasevich 2628d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2629d6de3097SVlad Yasevich * XXX: see spec for what to do. 2630d6de3097SVlad Yasevich */ 2631d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2632d6de3097SVlad Yasevich break; 2633d6de3097SVlad Yasevich 2634d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2635d6de3097SVlad Yasevich if (!t) 2636d6de3097SVlad Yasevich break; 2637d6de3097SVlad Yasevich 2638d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2639d6de3097SVlad Yasevich break; 2640d6de3097SVlad Yasevich 2641131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2642131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2643131a47e3SVlad Yasevich break; 2644131a47e3SVlad Yasevich 26451da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 2646e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) { 26471da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26481da177e4SLinus Torvalds break; 26491da177e4SLinus Torvalds } 26501da177e4SLinus Torvalds /* Fall Through */ 2651730fc3d0SVlad Yasevich goto fall_through; 2652730fc3d0SVlad Yasevich 2653730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2654e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2655730fc3d0SVlad Yasevich goto fall_through; 2656730fc3d0SVlad Yasevich 2657730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2658730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2659730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2660730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2661730fc3d0SVlad Yasevich retval = 0; 2662730fc3d0SVlad Yasevich break; 2663730fc3d0SVlad Yasevich } 2664730fc3d0SVlad Yasevich break; 2665730fc3d0SVlad Yasevich 2666730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2667e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2668730fc3d0SVlad Yasevich goto fall_through; 2669730fc3d0SVlad Yasevich 2670730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2671730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2672730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2673730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2674730fc3d0SVlad Yasevich retval = 0; 2675730fc3d0SVlad Yasevich break; 2676730fc3d0SVlad Yasevich } 2677730fc3d0SVlad Yasevich 2678730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2679730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2680730fc3d0SVlad Yasevich break; 2681730fc3d0SVlad Yasevich 2682730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2683e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2684730fc3d0SVlad Yasevich goto fall_through; 2685730fc3d0SVlad Yasevich 2686730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2687730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2688730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2689730fc3d0SVlad Yasevich retval = 0; 2690730fc3d0SVlad Yasevich break; 2691730fc3d0SVlad Yasevich fall_through: 26921da177e4SLinus Torvalds default: 26931da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 26941da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 26951da177e4SLinus Torvalds * called prior to this routine. Simply log the error 26961da177e4SLinus Torvalds * here. 26971da177e4SLinus Torvalds */ 2698bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2699bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 27001da177e4SLinus Torvalds break; 27013ff50b79SStephen Hemminger } 27021da177e4SLinus Torvalds 27031da177e4SLinus Torvalds return retval; 27041da177e4SLinus Torvalds } 27051da177e4SLinus Torvalds 27061da177e4SLinus Torvalds /* Select a new verification tag. */ 27071da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 27081da177e4SLinus Torvalds { 27091da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 27101da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 27111da177e4SLinus Torvalds */ 27121da177e4SLinus Torvalds __u32 x; 27131da177e4SLinus Torvalds 27141da177e4SLinus Torvalds do { 27151da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27161da177e4SLinus Torvalds } while (x == 0); 27171da177e4SLinus Torvalds 27181da177e4SLinus Torvalds return x; 27191da177e4SLinus Torvalds } 27201da177e4SLinus Torvalds 27211da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27221da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27231da177e4SLinus Torvalds { 27241da177e4SLinus Torvalds __u32 retval; 27251da177e4SLinus Torvalds 27261da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27271da177e4SLinus Torvalds return retval; 27281da177e4SLinus Torvalds } 27291da177e4SLinus Torvalds 27301da177e4SLinus Torvalds /* 27311da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27321da177e4SLinus Torvalds * 0 1 2 3 27331da177e4SLinus 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 27341da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27351da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27361da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27371da177e4SLinus Torvalds * | Serial Number | 27381da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27391da177e4SLinus Torvalds * | Address Parameter | 27401da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27411da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27431da177e4SLinus Torvalds * \ \ 27441da177e4SLinus Torvalds * / .... / 27451da177e4SLinus Torvalds * \ \ 27461da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27471da177e4SLinus Torvalds * | ASCONF Parameter #N | 27481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27491da177e4SLinus Torvalds * 27501da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27511da177e4SLinus Torvalds */ 27521da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27531da177e4SLinus Torvalds union sctp_addr *addr, 27541da177e4SLinus Torvalds int vparam_len) 27551da177e4SLinus Torvalds { 27561da177e4SLinus Torvalds sctp_addiphdr_t asconf; 27571da177e4SLinus Torvalds struct sctp_chunk *retval; 27581da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27591da177e4SLinus Torvalds union sctp_addr_param addrparam; 27601da177e4SLinus Torvalds int addrlen; 27611da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27621da177e4SLinus Torvalds 27631da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27641da177e4SLinus Torvalds if (!addrlen) 27651da177e4SLinus Torvalds return NULL; 27661da177e4SLinus Torvalds length += addrlen; 27671da177e4SLinus Torvalds 27681da177e4SLinus Torvalds /* Create the chunk. */ 2769072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length); 27701da177e4SLinus Torvalds if (!retval) 27711da177e4SLinus Torvalds return NULL; 27721da177e4SLinus Torvalds 27731da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27741da177e4SLinus Torvalds 27751da177e4SLinus Torvalds retval->subh.addip_hdr = 27761da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27771da177e4SLinus Torvalds retval->param_hdr.v = 27781da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27791da177e4SLinus Torvalds 27801da177e4SLinus Torvalds return retval; 27811da177e4SLinus Torvalds } 27821da177e4SLinus Torvalds 27831da177e4SLinus Torvalds /* ADDIP 27841da177e4SLinus Torvalds * 3.2.1 Add IP Address 27851da177e4SLinus Torvalds * 0 1 2 3 27861da177e4SLinus 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 27871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27881da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 27891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27901da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27921da177e4SLinus Torvalds * | Address Parameter | 27931da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27941da177e4SLinus Torvalds * 27951da177e4SLinus Torvalds * 3.2.2 Delete IP Address 27961da177e4SLinus Torvalds * 0 1 2 3 27971da177e4SLinus 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 27981da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27991da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 28001da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28011da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28021da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28031da177e4SLinus Torvalds * | Address Parameter | 28041da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28051da177e4SLinus Torvalds * 28061da177e4SLinus Torvalds */ 28071da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 28081da177e4SLinus Torvalds union sctp_addr *laddr, 28091da177e4SLinus Torvalds struct sockaddr *addrs, 28101da177e4SLinus Torvalds int addrcnt, 2811dbc16db1SAl Viro __be16 flags) 28121da177e4SLinus Torvalds { 28131da177e4SLinus Torvalds sctp_addip_param_t param; 28141da177e4SLinus Torvalds struct sctp_chunk *retval; 28151da177e4SLinus Torvalds union sctp_addr_param addr_param; 28161da177e4SLinus Torvalds union sctp_addr *addr; 28171da177e4SLinus Torvalds void *addr_buf; 28181da177e4SLinus Torvalds struct sctp_af *af; 28191da177e4SLinus Torvalds int paramlen = sizeof(param); 28201da177e4SLinus Torvalds int addr_param_len = 0; 28211da177e4SLinus Torvalds int totallen = 0; 28221da177e4SLinus Torvalds int i; 28238a07eb0aSMichio Honda int del_pickup = 0; 28241da177e4SLinus Torvalds 28251da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28261da177e4SLinus Torvalds addr_buf = addrs; 28271da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2828ea110733SJoe Perches addr = addr_buf; 28291da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28301da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28311da177e4SLinus Torvalds 28321da177e4SLinus Torvalds totallen += paramlen; 28331da177e4SLinus Torvalds totallen += addr_param_len; 28341da177e4SLinus Torvalds 28351da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28368a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28378a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28388a07eb0aSMichio Honda totallen += paramlen; 28398a07eb0aSMichio Honda totallen += addr_param_len; 28408a07eb0aSMichio Honda del_pickup = 1; 2841bb33381dSDaniel Borkmann 2842bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2843bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2844bb33381dSDaniel Borkmann __func__, totallen); 28458a07eb0aSMichio Honda } 28461da177e4SLinus Torvalds } 28471da177e4SLinus Torvalds 28481da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28491da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28501da177e4SLinus Torvalds if (!retval) 28511da177e4SLinus Torvalds return NULL; 28521da177e4SLinus Torvalds 28531da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28541da177e4SLinus Torvalds addr_buf = addrs; 28551da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2856ea110733SJoe Perches addr = addr_buf; 28571da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28581da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28591da177e4SLinus Torvalds param.param_hdr.type = flags; 28601da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 28611da177e4SLinus Torvalds param.crr_id = i; 28621da177e4SLinus Torvalds 28631da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28641da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28651da177e4SLinus Torvalds 28661da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28671da177e4SLinus Torvalds } 28688a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28698a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28708a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28718a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28728a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28738a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 28748a07eb0aSMichio Honda param.crr_id = i; 28758a07eb0aSMichio Honda 28768a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28778a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28788a07eb0aSMichio Honda } 28791da177e4SLinus Torvalds return retval; 28801da177e4SLinus Torvalds } 28811da177e4SLinus Torvalds 28821da177e4SLinus Torvalds /* ADDIP 28831da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 28841da177e4SLinus Torvalds * 0 1 2 3 28851da177e4SLinus 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 28861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28871da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 28881da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28891da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28901da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28911da177e4SLinus Torvalds * | Address Parameter | 28921da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28931da177e4SLinus Torvalds * 28941da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 28951da177e4SLinus Torvalds */ 28961da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 28971da177e4SLinus Torvalds union sctp_addr *addr) 28981da177e4SLinus Torvalds { 28991da177e4SLinus Torvalds sctp_addip_param_t param; 29001da177e4SLinus Torvalds struct sctp_chunk *retval; 29011da177e4SLinus Torvalds int len = sizeof(param); 29021da177e4SLinus Torvalds union sctp_addr_param addrparam; 29031da177e4SLinus Torvalds int addrlen; 29041da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 29051da177e4SLinus Torvalds 29061da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 29071da177e4SLinus Torvalds if (!addrlen) 29081da177e4SLinus Torvalds return NULL; 29091da177e4SLinus Torvalds len += addrlen; 29101da177e4SLinus Torvalds 29111da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 29121da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 29131da177e4SLinus Torvalds if (!retval) 29141da177e4SLinus Torvalds return NULL; 29151da177e4SLinus Torvalds 29161da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29171da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29181da177e4SLinus Torvalds param.crr_id = 0; 29191da177e4SLinus Torvalds 29201da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29211da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29221da177e4SLinus Torvalds 29231da177e4SLinus Torvalds return retval; 29241da177e4SLinus Torvalds } 29251da177e4SLinus Torvalds 29261da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29271da177e4SLinus Torvalds * 0 1 2 3 29281da177e4SLinus 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 29291da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29301da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29311da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29321da177e4SLinus Torvalds * | Serial Number | 29331da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29341da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29351da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29361da177e4SLinus Torvalds * \ \ 29371da177e4SLinus Torvalds * / .... / 29381da177e4SLinus Torvalds * \ \ 29391da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29401da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29411da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29421da177e4SLinus Torvalds * 29431da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29441da177e4SLinus Torvalds */ 29451da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29461da177e4SLinus Torvalds __u32 serial, int vparam_len) 29471da177e4SLinus Torvalds { 29481da177e4SLinus Torvalds sctp_addiphdr_t asconf; 29491da177e4SLinus Torvalds struct sctp_chunk *retval; 29501da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29511da177e4SLinus Torvalds 29521da177e4SLinus Torvalds /* Create the chunk. */ 2953072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length); 29541da177e4SLinus Torvalds if (!retval) 29551da177e4SLinus Torvalds return NULL; 29561da177e4SLinus Torvalds 29571da177e4SLinus Torvalds asconf.serial = htonl(serial); 29581da177e4SLinus Torvalds 29591da177e4SLinus Torvalds retval->subh.addip_hdr = 29601da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29611da177e4SLinus Torvalds 29621da177e4SLinus Torvalds return retval; 29631da177e4SLinus Torvalds } 29641da177e4SLinus Torvalds 29651da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29669f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2967dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 29681da177e4SLinus Torvalds { 29691da177e4SLinus Torvalds sctp_addip_param_t ack_param; 29701da177e4SLinus Torvalds sctp_errhdr_t err_param; 29711da177e4SLinus Torvalds int asconf_param_len = 0; 29721da177e4SLinus Torvalds int err_param_len = 0; 2973dbc16db1SAl Viro __be16 response_type; 29741da177e4SLinus Torvalds 29751da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 29761da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 29771da177e4SLinus Torvalds } else { 29781da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 29791da177e4SLinus Torvalds err_param_len = sizeof(err_param); 29801da177e4SLinus Torvalds if (asconf_param) 29811da177e4SLinus Torvalds asconf_param_len = 29821da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 29831da177e4SLinus Torvalds } 29841da177e4SLinus Torvalds 29851da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 29861da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 29871da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 29881da177e4SLinus Torvalds err_param_len + 29891da177e4SLinus Torvalds asconf_param_len); 29901da177e4SLinus Torvalds ack_param.crr_id = crr_id; 29911da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 29921da177e4SLinus Torvalds 29931da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 29941da177e4SLinus Torvalds return; 29951da177e4SLinus Torvalds 29961da177e4SLinus Torvalds /* Add Error Cause parameter. */ 29971da177e4SLinus Torvalds err_param.cause = err_code; 29981da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 29991da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 30001da177e4SLinus Torvalds 30011da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 30021da177e4SLinus Torvalds if (asconf_param) 30031da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 30041da177e4SLinus Torvalds } 30051da177e4SLinus Torvalds 30061da177e4SLinus Torvalds /* Process a asconf parameter. */ 3007dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 30081da177e4SLinus Torvalds struct sctp_chunk *asconf, 30091da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 30101da177e4SLinus Torvalds { 30111da177e4SLinus Torvalds struct sctp_transport *peer; 30121da177e4SLinus Torvalds struct sctp_af *af; 30131da177e4SLinus Torvalds union sctp_addr addr; 30141da177e4SLinus Torvalds union sctp_addr_param *addr_param; 30151da177e4SLinus Torvalds 3016ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 3017c1cc678aSPatrick McHardy 301844e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 301944e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 302044e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 302144e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 302244e65c1eSWei Yongjun 30236a435732SShan Wei switch (addr_param->p.type) { 3024c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 3025c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 3026945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3027c4492586SWei Yongjun break; 3028c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 3029c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 3030945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3031c4492586SWei Yongjun break; 3032c4492586SWei Yongjun default: 3033945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3034c4492586SWei Yongjun } 3035c4492586SWei Yongjun 30366a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30371da177e4SLinus Torvalds if (unlikely(!af)) 3038945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30391da177e4SLinus Torvalds 3040dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 304142e30bf3SVlad Yasevich 304242e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 304342e30bf3SVlad Yasevich * or multicast address. 304442e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 304542e30bf3SVlad Yasevich * make sure we check for that) 304642e30bf3SVlad Yasevich */ 304742e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3048945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 304942e30bf3SVlad Yasevich 30501da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30511da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 305242e30bf3SVlad Yasevich /* Section 4.2.1: 305342e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 305442e30bf3SVlad Yasevich * address of the packet MUST be added. 305542e30bf3SVlad Yasevich */ 305642e30bf3SVlad Yasevich if (af->is_any(&addr)) 305742e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 305842e30bf3SVlad Yasevich 30591da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30601da177e4SLinus Torvalds * request and does not have the local resources to add this 30611da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30621da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30631da177e4SLinus Torvalds * Due to Resource Shortage'. 30641da177e4SLinus Torvalds */ 30651da177e4SLinus Torvalds 3066dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30671da177e4SLinus Torvalds if (!peer) 30681da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30691da177e4SLinus Torvalds 30701da177e4SLinus Torvalds /* Start the heartbeat timer. */ 30711da177e4SLinus Torvalds if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) 30721da177e4SLinus Torvalds sctp_transport_hold(peer); 30736af29cccSMichio Honda asoc->new_transport = peer; 30741da177e4SLinus Torvalds break; 30751da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30761da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30771da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30781da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30791da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 30801da177e4SLinus Torvalds */ 308142e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 30821da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 30831da177e4SLinus Torvalds 30841da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 30851da177e4SLinus Torvalds * address which is also the source address of the IP packet 30861da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 30871da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 30881da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 30891da177e4SLinus Torvalds * Delete Source IP Address' 30901da177e4SLinus Torvalds */ 3091b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 30921da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 30931da177e4SLinus Torvalds 309442e30bf3SVlad Yasevich /* Section 4.2.2 309542e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 309642e30bf3SVlad Yasevich * addresses of the peer except the source address of the 309742e30bf3SVlad Yasevich * packet MUST be deleted. 309842e30bf3SVlad Yasevich */ 309942e30bf3SVlad Yasevich if (af->is_any(&addr)) { 310042e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 310142e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 310242e30bf3SVlad Yasevich asconf->transport); 310342e30bf3SVlad Yasevich } else 3104dd86d136SAl Viro sctp_assoc_del_peer(asoc, &addr); 31051da177e4SLinus Torvalds break; 31061da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 310742e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 310842e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 310942e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 311042e30bf3SVlad Yasevich * primary. 311142e30bf3SVlad Yasevich */ 311242e30bf3SVlad Yasevich if (af->is_any(&addr)) 311342e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 311442e30bf3SVlad Yasevich 3115dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31161da177e4SLinus Torvalds if (!peer) 3117945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31181da177e4SLinus Torvalds 31191da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31201da177e4SLinus Torvalds break; 31211da177e4SLinus Torvalds } 31221da177e4SLinus Torvalds 31231da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31241da177e4SLinus Torvalds } 31251da177e4SLinus Torvalds 31266f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31276f4c618dSWei Yongjun int sctp_verify_asconf(const struct sctp_association *asoc, 31286f4c618dSWei Yongjun struct sctp_paramhdr *param_hdr, void *chunk_end, 31296f4c618dSWei Yongjun struct sctp_paramhdr **errp) { 31306f4c618dSWei Yongjun sctp_addip_param_t *asconf_param; 31316f4c618dSWei Yongjun union sctp_params param; 31326f4c618dSWei Yongjun int length, plen; 31336f4c618dSWei Yongjun 31346f4c618dSWei Yongjun param.v = (sctp_paramhdr_t *) param_hdr; 31356f4c618dSWei Yongjun while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) { 31366f4c618dSWei Yongjun length = ntohs(param.p->length); 31376f4c618dSWei Yongjun *errp = param.p; 31386f4c618dSWei Yongjun 31396f4c618dSWei Yongjun if (param.v > chunk_end - length || 31406f4c618dSWei Yongjun length < sizeof(sctp_paramhdr_t)) 31416f4c618dSWei Yongjun return 0; 31426f4c618dSWei Yongjun 31436f4c618dSWei Yongjun switch (param.p->type) { 31446f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31456f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31466f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31476f4c618dSWei Yongjun asconf_param = (sctp_addip_param_t *)param.v; 31486f4c618dSWei Yongjun plen = ntohs(asconf_param->param_hdr.length); 31496f4c618dSWei Yongjun if (plen < sizeof(sctp_addip_param_t) + 31506f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 31516f4c618dSWei Yongjun return 0; 31526f4c618dSWei Yongjun break; 31536f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 31546f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 31556f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 31566f4c618dSWei Yongjun return 0; 31576f4c618dSWei Yongjun 31586f4c618dSWei Yongjun break; 31596f4c618dSWei Yongjun default: 31606f4c618dSWei Yongjun break; 31616f4c618dSWei Yongjun } 31626f4c618dSWei Yongjun 31636f4c618dSWei Yongjun param.v += WORD_ROUND(length); 31646f4c618dSWei Yongjun } 31656f4c618dSWei Yongjun 31666f4c618dSWei Yongjun if (param.v != chunk_end) 31676f4c618dSWei Yongjun return 0; 31686f4c618dSWei Yongjun 31696f4c618dSWei Yongjun return 1; 31706f4c618dSWei Yongjun } 31716f4c618dSWei Yongjun 31721da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 31731da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 31741da177e4SLinus Torvalds */ 31751da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 31761da177e4SLinus Torvalds struct sctp_chunk *asconf) 31771da177e4SLinus Torvalds { 31781da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 31791da177e4SLinus Torvalds union sctp_addr_param *addr_param; 31801da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 31811da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 31821da177e4SLinus Torvalds 3183dbc16db1SAl Viro __be16 err_code; 31841da177e4SLinus Torvalds int length = 0; 3185f3830cccSWei Yongjun int chunk_len; 31861da177e4SLinus Torvalds __u32 serial; 31871da177e4SLinus Torvalds int all_param_pass = 1; 31881da177e4SLinus Torvalds 3189f3830cccSWei Yongjun chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); 31901da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 31911da177e4SLinus Torvalds serial = ntohl(hdr->serial); 31921da177e4SLinus Torvalds 31931da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 31941da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 31951da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 31961da177e4SLinus Torvalds chunk_len -= length; 31971da177e4SLinus Torvalds 31981da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 31997aa1b54bSJoe Perches * asconf parameter. 32001da177e4SLinus Torvalds */ 32016a435732SShan Wei length = ntohs(addr_param->p.length); 3202ea110733SJoe Perches asconf_param = (void *)addr_param + length; 32031da177e4SLinus Torvalds chunk_len -= length; 32041da177e4SLinus Torvalds 32051da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 32061da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 32072cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 32087aa1b54bSJoe Perches * parameters. 32091da177e4SLinus Torvalds */ 32102cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 32111da177e4SLinus Torvalds if (!asconf_ack) 32121da177e4SLinus Torvalds goto done; 32131da177e4SLinus Torvalds 32141da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 32151da177e4SLinus Torvalds while (chunk_len > 0) { 32161da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 32171da177e4SLinus Torvalds asconf_param); 32181da177e4SLinus Torvalds /* ADDIP 4.1 A7) 32191da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 32201da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 32211da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 32221da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 32231da177e4SLinus Torvalds * a specific success indication is present for the parameter. 32241da177e4SLinus Torvalds */ 32251da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR != err_code) 32261da177e4SLinus Torvalds all_param_pass = 0; 32271da177e4SLinus Torvalds 32281da177e4SLinus Torvalds if (!all_param_pass) 32291da177e4SLinus Torvalds sctp_add_asconf_response(asconf_ack, 32301da177e4SLinus Torvalds asconf_param->crr_id, err_code, 32311da177e4SLinus Torvalds asconf_param); 32321da177e4SLinus Torvalds 32331da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32341da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32351da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32361da177e4SLinus Torvalds * in the ASCONF. 32371da177e4SLinus Torvalds */ 32381da177e4SLinus Torvalds if (SCTP_ERROR_RSRC_LOW == err_code) 32391da177e4SLinus Torvalds goto done; 32401da177e4SLinus Torvalds 32411da177e4SLinus Torvalds /* Move to the next ASCONF param. */ 32421da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3243ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 32441da177e4SLinus Torvalds chunk_len -= length; 32451da177e4SLinus Torvalds } 32461da177e4SLinus Torvalds 32471da177e4SLinus Torvalds done: 32481da177e4SLinus Torvalds asoc->peer.addip_serial++; 32491da177e4SLinus Torvalds 32501da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 32511da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 32521da177e4SLinus Torvalds */ 32531da177e4SLinus Torvalds if (asconf_ack) { 32541da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3255a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3256a08de64dSVlad Yasevich &asoc->asconf_ack_list); 32571da177e4SLinus Torvalds } 32581da177e4SLinus Torvalds 32591da177e4SLinus Torvalds return asconf_ack; 32601da177e4SLinus Torvalds } 32611da177e4SLinus Torvalds 32621da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3263425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 32641da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 32651da177e4SLinus Torvalds { 32661da177e4SLinus Torvalds struct sctp_af *af; 32671da177e4SLinus Torvalds union sctp_addr addr; 32681da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 32691da177e4SLinus Torvalds union sctp_addr_param *addr_param; 32701da177e4SLinus Torvalds struct sctp_transport *transport; 3271dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 32721da177e4SLinus Torvalds 3273ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 32741da177e4SLinus Torvalds 32751da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 32766a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3277dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 32781da177e4SLinus Torvalds 32791da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 32801da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3281559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3282559cf710SVlad Yasevich * held, so the list can not change. 3283559cf710SVlad Yasevich */ 32840ed90fb0SVlad Yasevich local_bh_disable(); 3285559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3286dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3287f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3288dc022a98SSridhar Samudrala } 32890ed90fb0SVlad Yasevich local_bh_enable(); 32903cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 32913cd9749cSWei Yongjun transports) { 32923cd9749cSWei Yongjun dst_release(transport->dst); 3293c6ef006bSVlad Yasevich transport->dst = NULL; 32943cd9749cSWei Yongjun } 32951da177e4SLinus Torvalds break; 32961da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 32970ed90fb0SVlad Yasevich local_bh_disable(); 3298425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 32998a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 33008a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 33018a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 33028a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 33038a07eb0aSMichio Honda } 33040ed90fb0SVlad Yasevich local_bh_enable(); 33059dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33069dbc15f0SRobert P. J. Day transports) { 3307dc022a98SSridhar Samudrala dst_release(transport->dst); 3308c6ef006bSVlad Yasevich transport->dst = NULL; 33091da177e4SLinus Torvalds } 33101da177e4SLinus Torvalds break; 33111da177e4SLinus Torvalds default: 33121da177e4SLinus Torvalds break; 33131da177e4SLinus Torvalds } 33141da177e4SLinus Torvalds } 33151da177e4SLinus Torvalds 33161da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 33171da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 33181da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 33191da177e4SLinus Torvalds * ADDIP 4.1 33201da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 33211da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 33221da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 33231da177e4SLinus Torvalds * specific success indication is present for the parameter. 33241da177e4SLinus Torvalds */ 3325dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 33261da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 33271da177e4SLinus Torvalds int no_err) 33281da177e4SLinus Torvalds { 33291da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 33301da177e4SLinus Torvalds sctp_errhdr_t *err_param; 33311da177e4SLinus Torvalds int length; 3332f3830cccSWei Yongjun int asconf_ack_len; 3333dbc16db1SAl Viro __be16 err_code; 33341da177e4SLinus Torvalds 33351da177e4SLinus Torvalds if (no_err) 33361da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33371da177e4SLinus Torvalds else 33381da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33391da177e4SLinus Torvalds 3340f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3341f3830cccSWei Yongjun sizeof(sctp_chunkhdr_t); 3342f3830cccSWei Yongjun 33431da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33441da177e4SLinus Torvalds * the first asconf_ack parameter. 33451da177e4SLinus Torvalds */ 33461da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 33471da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 33481da177e4SLinus Torvalds length); 33491da177e4SLinus Torvalds asconf_ack_len -= length; 33501da177e4SLinus Torvalds 33511da177e4SLinus Torvalds while (asconf_ack_len > 0) { 33521da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 33531da177e4SLinus Torvalds switch(asconf_ack_param->param_hdr.type) { 33541da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 33551da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 33561da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 33571da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 3358ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 33591da177e4SLinus Torvalds asconf_ack_len -= length; 33601da177e4SLinus Torvalds if (asconf_ack_len > 0) 33611da177e4SLinus Torvalds return err_param->cause; 33621da177e4SLinus Torvalds else 33631da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33641da177e4SLinus Torvalds break; 33651da177e4SLinus Torvalds default: 33661da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33671da177e4SLinus Torvalds } 33681da177e4SLinus Torvalds } 33691da177e4SLinus Torvalds 33701da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3371ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 33721da177e4SLinus Torvalds asconf_ack_len -= length; 33731da177e4SLinus Torvalds } 33741da177e4SLinus Torvalds 33751da177e4SLinus Torvalds return err_code; 33761da177e4SLinus Torvalds } 33771da177e4SLinus Torvalds 33781da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 33791da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 33801da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 33811da177e4SLinus Torvalds { 33821da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 33831da177e4SLinus Torvalds union sctp_addr_param *addr_param; 33841da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 33851da177e4SLinus Torvalds int length = 0; 33861da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 33871da177e4SLinus Torvalds int all_param_pass = 0; 33881da177e4SLinus Torvalds int no_err = 1; 33891da177e4SLinus Torvalds int retval = 0; 3390dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 33911da177e4SLinus Torvalds 33921da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 33931da177e4SLinus Torvalds * a pointer to address parameter. 33941da177e4SLinus Torvalds */ 33951da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 33961da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 33971da177e4SLinus Torvalds asconf_len -= length; 33981da177e4SLinus Torvalds 33991da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 34007aa1b54bSJoe Perches * pointer to the first asconf parameter. 34011da177e4SLinus Torvalds */ 34026a435732SShan Wei length = ntohs(addr_param->p.length); 3403ea110733SJoe Perches asconf_param = (void *)addr_param + length; 34041da177e4SLinus Torvalds asconf_len -= length; 34051da177e4SLinus Torvalds 34061da177e4SLinus Torvalds /* ADDIP 4.1 34071da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 34081da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 34091da177e4SLinus Torvalds * successful. 34101da177e4SLinus Torvalds */ 34111da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 34121da177e4SLinus Torvalds all_param_pass = 1; 34131da177e4SLinus Torvalds 34141da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 34151da177e4SLinus Torvalds while (asconf_len > 0) { 34161da177e4SLinus Torvalds if (all_param_pass) 34171da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34181da177e4SLinus Torvalds else { 34191da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 34201da177e4SLinus Torvalds asconf_param, 34211da177e4SLinus Torvalds no_err); 34221da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 34231da177e4SLinus Torvalds no_err = 0; 34241da177e4SLinus Torvalds } 34251da177e4SLinus Torvalds 34261da177e4SLinus Torvalds switch (err_code) { 34271da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3428425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 34291da177e4SLinus Torvalds break; 34301da177e4SLinus Torvalds 34311da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 34321da177e4SLinus Torvalds retval = 1; 34331da177e4SLinus Torvalds break; 34341da177e4SLinus Torvalds 3435a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34361da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34371da177e4SLinus Torvalds * future. 34381da177e4SLinus Torvalds */ 34391da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34401da177e4SLinus Torvalds asconf_param->param_hdr.type; 34411da177e4SLinus Torvalds break; 34421da177e4SLinus Torvalds 34431da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34441da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34451da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34461da177e4SLinus Torvalds default: 34471da177e4SLinus Torvalds break; 34481da177e4SLinus Torvalds } 34491da177e4SLinus Torvalds 34501da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 34511da177e4SLinus Torvalds * one. 34521da177e4SLinus Torvalds */ 34531da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3454ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 34551da177e4SLinus Torvalds asconf_len -= length; 34561da177e4SLinus Torvalds } 34571da177e4SLinus Torvalds 3458ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 34598a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3460ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3461ddc4bbeeSMichio Honda } 34628a07eb0aSMichio Honda 34631da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 34645f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 34651da177e4SLinus Torvalds sctp_chunk_free(asconf); 34661da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 34671da177e4SLinus Torvalds 34681da177e4SLinus Torvalds return retval; 34691da177e4SLinus Torvalds } 34701da177e4SLinus Torvalds 34711da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 34721da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 34731da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 34741da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 34751da177e4SLinus Torvalds { 34761da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 34771da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 34781da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 34791da177e4SLinus Torvalds size_t hint; 34801da177e4SLinus Torvalds int i; 34811da177e4SLinus Torvalds 34821da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 34831da177e4SLinus Torvalds 3484072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint); 34851da177e4SLinus Torvalds 34861da177e4SLinus Torvalds if (!retval) 34871da177e4SLinus Torvalds return NULL; 34881da177e4SLinus Torvalds 34891da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 34901da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 34911da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 34921da177e4SLinus Torvalds 34931da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 34941da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 34951da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 34961da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 34971da177e4SLinus Torvalds } 34981da177e4SLinus Torvalds 34991da177e4SLinus Torvalds return retval; 35001da177e4SLinus Torvalds } 3501