160c778b2SVlad Yasevich /* SCTP kernel implementation 21da177e4SLinus Torvalds * (C) Copyright IBM Corp. 2001, 2004 31da177e4SLinus Torvalds * Copyright (c) 1999-2000 Cisco, Inc. 41da177e4SLinus Torvalds * Copyright (c) 1999-2001 Motorola, Inc. 51da177e4SLinus Torvalds * Copyright (c) 2001-2002 Intel Corp. 61da177e4SLinus Torvalds * 760c778b2SVlad Yasevich * This file is part of the SCTP kernel implementation 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * These functions work with the state functions in sctp_sm_statefuns.c 101da177e4SLinus Torvalds * to implement the state operations. These functions implement the 111da177e4SLinus Torvalds * steps which require modifying existing data structures. 121da177e4SLinus Torvalds * 1360c778b2SVlad Yasevich * This SCTP implementation is free software; 141da177e4SLinus Torvalds * you can redistribute it and/or modify it under the terms of 151da177e4SLinus Torvalds * the GNU General Public License as published by 161da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 171da177e4SLinus Torvalds * any later version. 181da177e4SLinus Torvalds * 1960c778b2SVlad Yasevich * This SCTP implementation is distributed in the hope that it 201da177e4SLinus Torvalds * will be useful, but WITHOUT ANY WARRANTY; without even the implied 211da177e4SLinus Torvalds * ************************ 221da177e4SLinus Torvalds * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 231da177e4SLinus Torvalds * See the GNU General Public License for more details. 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 261da177e4SLinus Torvalds * along with GNU CC; see the file COPYING. If not, write to 271da177e4SLinus Torvalds * the Free Software Foundation, 59 Temple Place - Suite 330, 281da177e4SLinus Torvalds * Boston, MA 02111-1307, USA. 291da177e4SLinus Torvalds * 301da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 311da177e4SLinus Torvalds * email address(es): 321da177e4SLinus Torvalds * lksctp developers <lksctp-developers@lists.sourceforge.net> 331da177e4SLinus Torvalds * 341da177e4SLinus Torvalds * Or submit a bug report through the following website: 351da177e4SLinus Torvalds * http://www.sf.net/projects/lksctp 361da177e4SLinus Torvalds * 371da177e4SLinus Torvalds * Written or modified by: 381da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 391da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 401da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 411da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 421da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 431da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 441da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 451da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 461da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 471da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 481da177e4SLinus Torvalds * 491da177e4SLinus Torvalds * Any bugs reported given to us we will try to fix... any fixes shared will 501da177e4SLinus Torvalds * be incorporated into the next SCTP release. 511da177e4SLinus Torvalds */ 521da177e4SLinus Torvalds 53145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 54145ce502SJoe Perches 551da177e4SLinus Torvalds #include <linux/types.h> 561da177e4SLinus Torvalds #include <linux/kernel.h> 571da177e4SLinus Torvalds #include <linux/ip.h> 581da177e4SLinus Torvalds #include <linux/ipv6.h> 591da177e4SLinus Torvalds #include <linux/net.h> 601da177e4SLinus Torvalds #include <linux/inet.h> 61ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 621da177e4SLinus Torvalds #include <linux/crypto.h> 635a0e3ad6STejun Heo #include <linux/slab.h> 641da177e4SLinus Torvalds #include <net/sock.h> 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds #include <linux/skbuff.h> 671da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 681da177e4SLinus Torvalds #include <net/sctp/sctp.h> 691da177e4SLinus Torvalds #include <net/sctp/sm.h> 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds SCTP_STATIC 721da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 731da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen); 741da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 751da177e4SLinus Torvalds const struct sctp_association *asoc, 761da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 771da177e4SLinus Torvalds int *cookie_len, 781da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 791da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 801da177e4SLinus Torvalds union sctp_params param, 811da177e4SLinus Torvalds const union sctp_addr *peer_addr, 82dd0fc66fSAl Viro gfp_t gfp); 838ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 848ee4be37SVlad Yasevich const void *data); 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 871da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 881da177e4SLinus Torvalds { 891da177e4SLinus Torvalds struct sctp_af *af; 901da177e4SLinus Torvalds int iif = 0; 911da177e4SLinus Torvalds 92eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version)); 931da177e4SLinus Torvalds if (af) 941da177e4SLinus Torvalds iif = af->skb_iif(chunk->skb); 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds return iif; 971da177e4SLinus Torvalds } 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1001da177e4SLinus Torvalds * 1011da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1021da177e4SLinus Torvalds * Explicit Congestion Notification. 1031da177e4SLinus Torvalds */ 1041da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1051da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 10609640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1071da177e4SLinus Torvalds }; 1081da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1091da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 11009640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1111da177e4SLinus Torvalds }; 1121da177e4SLinus Torvalds 1135fa782c2SNeil Horman /* A helper to initialize an op error inside a 1141da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1151da177e4SLinus Torvalds * abort chunk. 1161da177e4SLinus Torvalds */ 1175bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 11800f1c2dfSWei Yongjun size_t paylen) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds sctp_errhdr_t err; 1211da177e4SLinus Torvalds __u16 len; 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1241da177e4SLinus Torvalds err.cause = cause_code; 1251da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1261da177e4SLinus Torvalds err.length = htons(len); 1274a1c0107SVlad Yasevich chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 1305fa782c2SNeil Horman /* A helper to initialize an op error inside a 1315fa782c2SNeil Horman * provided chunk, as most cause codes will be embedded inside an 1325fa782c2SNeil Horman * abort chunk. Differs from sctp_init_cause in that it won't oops 1335fa782c2SNeil Horman * if there isn't enough space in the op error chunk 1345fa782c2SNeil Horman */ 135db28aafaSIoan Orghici static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, 1365fa782c2SNeil Horman size_t paylen) 1375fa782c2SNeil Horman { 1385fa782c2SNeil Horman sctp_errhdr_t err; 1395fa782c2SNeil Horman __u16 len; 1405fa782c2SNeil Horman 1415fa782c2SNeil Horman /* Cause code constants are now defined in network order. */ 1425fa782c2SNeil Horman err.cause = cause_code; 1435fa782c2SNeil Horman len = sizeof(sctp_errhdr_t) + paylen; 1445fa782c2SNeil Horman err.length = htons(len); 1455fa782c2SNeil Horman 1462e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) < len) 1475fa782c2SNeil Horman return -ENOSPC; 1485fa782c2SNeil Horman chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, 1495fa782c2SNeil Horman sizeof(sctp_errhdr_t), 1505fa782c2SNeil Horman &err); 1515fa782c2SNeil Horman return 0; 1525fa782c2SNeil Horman } 1531da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1541da177e4SLinus Torvalds * 1551da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1561da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1571da177e4SLinus Torvalds * 1581da177e4SLinus Torvalds * 0 1 2 3 1591da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 1601da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1611da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1621da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1631da177e4SLinus Torvalds * | Initiate Tag | 1641da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1651da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1661da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1671da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1681da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1691da177e4SLinus Torvalds * | Initial TSN | 1701da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1711da177e4SLinus Torvalds * \ \ 1721da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1731da177e4SLinus Torvalds * \ \ 1741da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1751da177e4SLinus Torvalds * 1761da177e4SLinus Torvalds * 1771da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1781da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1791da177e4SLinus Torvalds * 1801da177e4SLinus Torvalds * Fixed Parameters Status 1811da177e4SLinus Torvalds * ---------------------------------------------- 1821da177e4SLinus Torvalds * Initiate Tag Mandatory 1831da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 1841da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 1851da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 1861da177e4SLinus Torvalds * Initial TSN Mandatory 1871da177e4SLinus Torvalds * 1881da177e4SLinus Torvalds * Variable Parameters Status Type Value 1891da177e4SLinus Torvalds * ------------------------------------------------------------- 1901da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 1911da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 1921da177e4SLinus Torvalds * Cookie Preservative Optional 9 1931da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 1941da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 1951da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 1961da177e4SLinus Torvalds */ 1971da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 1981da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 199dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2001da177e4SLinus Torvalds { 201e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2021da177e4SLinus Torvalds sctp_inithdr_t init; 2031da177e4SLinus Torvalds union sctp_params addrs; 2041da177e4SLinus Torvalds size_t chunksize; 2051da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2061da177e4SLinus Torvalds int num_types, addrs_len = 0; 2071da177e4SLinus Torvalds struct sctp_sock *sp; 2081da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 2093dbe8656SAl Viro __be16 types[2]; 2100f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 211131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 212131a47e3SVlad Yasevich int num_ext = 0; 213131a47e3SVlad Yasevich __u8 extensions[3]; 214730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 215730fc3d0SVlad Yasevich *auth_hmacs = NULL; 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2181da177e4SLinus Torvalds * 2191da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2201da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2211da177e4SLinus Torvalds */ 2221da177e4SLinus Torvalds retval = NULL; 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2251da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2281da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2291da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2301da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2311da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds /* How many address types are needed? */ 2341da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2351da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2361da177e4SLinus Torvalds 237a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 238a8170c35SWei Yongjun chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types)); 2391da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2408ee4be37SVlad Yasevich 241e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 242036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 243036b579bSVlad Yasevich 244131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 245131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 246131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 247131a47e3SVlad Yasevich * INIT-ACK parameters. 248131a47e3SVlad Yasevich */ 249e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) { 250131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 251131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 252131a47e3SVlad Yasevich num_ext += 2; 253131a47e3SVlad Yasevich } 254131a47e3SVlad Yasevich 2556fc791eeSmalc if (sp->adaptation_ind) 2561da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2576fc791eeSmalc 2581da177e4SLinus Torvalds chunksize += vparam_len; 2591da177e4SLinus Torvalds 260730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 261e1fc3b14SEric W. Biederman if (net->sctp.auth_enable) { 262730fc3d0SVlad Yasevich /* Add random parameter length*/ 263730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 264730fc3d0SVlad Yasevich 265730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 266730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 267730fc3d0SVlad Yasevich if (auth_hmacs->length) 268a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 269730fc3d0SVlad Yasevich else 270730fc3d0SVlad Yasevich auth_hmacs = NULL; 271730fc3d0SVlad Yasevich 272730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 273730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 274730fc3d0SVlad Yasevich if (auth_chunks->length) 275a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 276730fc3d0SVlad Yasevich else 2779baffaa6SVlad Yasevich auth_chunks = NULL; 278730fc3d0SVlad Yasevich 279730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 280730fc3d0SVlad Yasevich num_ext += 1; 281730fc3d0SVlad Yasevich } 282730fc3d0SVlad Yasevich 283131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 284131a47e3SVlad Yasevich if (num_ext) 285a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 286a8170c35SWei Yongjun num_ext); 287131a47e3SVlad Yasevich 2881da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2891da177e4SLinus Torvalds * 2901da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 2911da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 2921da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 2931da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 2941da177e4SLinus Torvalds * other address types if the Host Name address parameter is 2951da177e4SLinus Torvalds * present in the received INIT chunk. 2961da177e4SLinus Torvalds * 2971da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 2981da177e4SLinus Torvalds */ 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize); 3011da177e4SLinus Torvalds if (!retval) 3021da177e4SLinus Torvalds goto nodata; 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds retval->subh.init_hdr = 3051da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3061da177e4SLinus Torvalds retval->param_hdr.v = 3071da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3101da177e4SLinus Torvalds * 3111da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3121da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3131da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3141da177e4SLinus Torvalds * support any address type. 3151da177e4SLinus Torvalds */ 3161da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3171da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3181da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3191da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 322131a47e3SVlad Yasevich 3237aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 324131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 325131a47e3SVlad Yasevich */ 326131a47e3SVlad Yasevich if (num_ext) { 327131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 328131a47e3SVlad Yasevich ext_param.param_hdr.length = 329131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 330131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 331131a47e3SVlad Yasevich &ext_param); 3328ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 333131a47e3SVlad Yasevich } 334131a47e3SVlad Yasevich 335e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 3361da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 337131a47e3SVlad Yasevich 3386fc791eeSmalc if (sp->adaptation_ind) { 3390f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3401da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3410f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3421da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3436fc791eeSmalc } 344131a47e3SVlad Yasevich 345730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 346e1fc3b14SEric W. Biederman if (net->sctp.auth_enable) { 347730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 348730fc3d0SVlad Yasevich asoc->c.auth_random); 349730fc3d0SVlad Yasevich if (auth_hmacs) 350730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 351730fc3d0SVlad Yasevich auth_hmacs); 352730fc3d0SVlad Yasevich if (auth_chunks) 353730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 354730fc3d0SVlad Yasevich auth_chunks); 355730fc3d0SVlad Yasevich } 3561da177e4SLinus Torvalds nodata: 3571da177e4SLinus Torvalds kfree(addrs.v); 3581da177e4SLinus Torvalds return retval; 3591da177e4SLinus Torvalds } 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3621da177e4SLinus Torvalds const struct sctp_chunk *chunk, 363dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3641da177e4SLinus Torvalds { 3651da177e4SLinus Torvalds sctp_inithdr_t initack; 3661da177e4SLinus Torvalds struct sctp_chunk *retval; 3671da177e4SLinus Torvalds union sctp_params addrs; 3686fc791eeSmalc struct sctp_sock *sp; 3691da177e4SLinus Torvalds int addrs_len; 3701da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3711da177e4SLinus Torvalds int cookie_len; 3721da177e4SLinus Torvalds size_t chunksize; 3730f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 374131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 375131a47e3SVlad Yasevich int num_ext = 0; 376131a47e3SVlad Yasevich __u8 extensions[3]; 377730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 378730fc3d0SVlad Yasevich *auth_hmacs = NULL, 379730fc3d0SVlad Yasevich *auth_random = NULL; 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds retval = NULL; 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 3841da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 3871da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 3881da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 3891da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 3901da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 3931da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 3941da177e4SLinus Torvalds */ 3951da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 3961da177e4SLinus Torvalds addrs.v, addrs_len); 3971da177e4SLinus Torvalds if (!cookie) 3981da177e4SLinus Torvalds goto nomem_cookie; 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4011da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4021da177e4SLinus Torvalds */ 4036fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4041da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4071da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4081da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4091da177e4SLinus Torvalds 4105ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 411036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 412036b579bSVlad Yasevich 4135ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 414131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 415131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 416131a47e3SVlad Yasevich num_ext += 2; 417131a47e3SVlad Yasevich } 418131a47e3SVlad Yasevich 4196fc791eeSmalc if (sp->adaptation_ind) 4201da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4211da177e4SLinus Torvalds 422730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 423730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 424730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 425730fc3d0SVlad Yasevich 426730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 427730fc3d0SVlad Yasevich if (auth_hmacs->length) 428a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 429730fc3d0SVlad Yasevich else 430730fc3d0SVlad Yasevich auth_hmacs = NULL; 431730fc3d0SVlad Yasevich 432730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 433730fc3d0SVlad Yasevich if (auth_chunks->length) 434a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 435730fc3d0SVlad Yasevich else 436730fc3d0SVlad Yasevich auth_chunks = NULL; 437730fc3d0SVlad Yasevich 438730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 439730fc3d0SVlad Yasevich num_ext += 1; 440730fc3d0SVlad Yasevich } 441730fc3d0SVlad Yasevich 4428ee4be37SVlad Yasevich if (num_ext) 443a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 444a8170c35SWei Yongjun num_ext); 4458ee4be37SVlad Yasevich 4461da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 4471da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize); 4481da177e4SLinus Torvalds if (!retval) 4491da177e4SLinus Torvalds goto nomem_chunk; 4501da177e4SLinus Torvalds 451b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 452b99a4d53SDan Carpenter * 453b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 454b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 455b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 456b99a4d53SDan Carpenter * to which it is replying. 457b99a4d53SDan Carpenter * 458b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4591da177e4SLinus Torvalds */ 4601da177e4SLinus Torvalds retval->transport = chunk->transport; 461b99a4d53SDan Carpenter 4621da177e4SLinus Torvalds retval->subh.init_hdr = 4631da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4641da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4651da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4661da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4671da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 468131a47e3SVlad Yasevich if (num_ext) { 469131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 470131a47e3SVlad Yasevich ext_param.param_hdr.length = 471131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 472131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 473131a47e3SVlad Yasevich &ext_param); 4748ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 475131a47e3SVlad Yasevich } 4761da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 4771da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 4781da177e4SLinus Torvalds 4796fc791eeSmalc if (sp->adaptation_ind) { 4800f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 4811da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 4826fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 4831da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 4846fc791eeSmalc } 4851da177e4SLinus Torvalds 486730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 487730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 488730fc3d0SVlad Yasevich auth_random); 489730fc3d0SVlad Yasevich if (auth_hmacs) 490730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 491730fc3d0SVlad Yasevich auth_hmacs); 492730fc3d0SVlad Yasevich if (auth_chunks) 493730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 494730fc3d0SVlad Yasevich auth_chunks); 495730fc3d0SVlad Yasevich } 496730fc3d0SVlad Yasevich 4971da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 4981da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds nomem_chunk: 5011da177e4SLinus Torvalds kfree(cookie); 5021da177e4SLinus Torvalds nomem_cookie: 5031da177e4SLinus Torvalds kfree(addrs.v); 5041da177e4SLinus Torvalds return retval; 5051da177e4SLinus Torvalds } 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5081da177e4SLinus Torvalds * 5091da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5101da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5111da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5121da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5131da177e4SLinus Torvalds * chunks in the same packet. 5141da177e4SLinus Torvalds * 5151da177e4SLinus Torvalds * 0 1 2 3 5161da177e4SLinus 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 5171da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5181da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5191da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5201da177e4SLinus Torvalds * / Cookie / 5211da177e4SLinus Torvalds * \ \ 5221da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5231da177e4SLinus Torvalds * 5241da177e4SLinus Torvalds * Chunk Flags: 8 bit 5251da177e4SLinus Torvalds * 5261da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5271da177e4SLinus Torvalds * 5281da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5291da177e4SLinus Torvalds * 5301da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5311da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5321da177e4SLinus Torvalds * 5331da177e4SLinus Torvalds * Cookie: variable size 5341da177e4SLinus Torvalds * 5351da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5361da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5371da177e4SLinus Torvalds * 5381da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5391da177e4SLinus Torvalds * to insure interoperability. 5401da177e4SLinus Torvalds */ 5411da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5421da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5431da177e4SLinus Torvalds { 5441da177e4SLinus Torvalds struct sctp_chunk *retval; 5451da177e4SLinus Torvalds void *cookie; 5461da177e4SLinus Torvalds int cookie_len; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5491da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 5521da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); 5531da177e4SLinus Torvalds if (!retval) 5541da177e4SLinus Torvalds goto nodata; 5551da177e4SLinus Torvalds retval->subh.cookie_hdr = 5561da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5591da177e4SLinus Torvalds * 5601da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5611da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5621da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5631da177e4SLinus Torvalds * to which it is replying. 5641da177e4SLinus Torvalds * 5651da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5661da177e4SLinus Torvalds */ 5671da177e4SLinus Torvalds if (chunk) 5681da177e4SLinus Torvalds retval->transport = chunk->transport; 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds nodata: 5711da177e4SLinus Torvalds return retval; 5721da177e4SLinus Torvalds } 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5751da177e4SLinus Torvalds * 5761da177e4SLinus Torvalds * This chunk is used only during the initialization of an 5771da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 5781da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 5791da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 5801da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 5811da177e4SLinus Torvalds * 5821da177e4SLinus Torvalds * 0 1 2 3 5831da177e4SLinus 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 5841da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5851da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 5861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5871da177e4SLinus Torvalds * 5881da177e4SLinus Torvalds * Chunk Flags: 8 bits 5891da177e4SLinus Torvalds * 5901da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5911da177e4SLinus Torvalds */ 5921da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 5931da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5941da177e4SLinus Torvalds { 5951da177e4SLinus Torvalds struct sctp_chunk *retval; 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0); 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6001da177e4SLinus Torvalds * 6011da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6021da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6031da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6041da177e4SLinus Torvalds * to which it is replying. 6051da177e4SLinus Torvalds * 6061da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6071da177e4SLinus Torvalds */ 6081da177e4SLinus Torvalds if (retval && chunk) 6091da177e4SLinus Torvalds retval->transport = chunk->transport; 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds return retval; 6121da177e4SLinus Torvalds } 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds /* 6151da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6161da177e4SLinus Torvalds * CWR: 6171da177e4SLinus Torvalds * 6181da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6191da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6201da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6211da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6221da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6231da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6241da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6251da177e4SLinus Torvalds * CE bit. 6261da177e4SLinus Torvalds * 6271da177e4SLinus Torvalds * 0 1 2 3 6281da177e4SLinus 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 6291da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6301da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6311da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6321da177e4SLinus Torvalds * | Lowest TSN Number | 6331da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6341da177e4SLinus Torvalds * 6351da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6361da177e4SLinus Torvalds */ 6371da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6381da177e4SLinus Torvalds const __u32 lowest_tsn, 6391da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6401da177e4SLinus Torvalds { 6411da177e4SLinus Torvalds struct sctp_chunk *retval; 6421da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 6451da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0, 6461da177e4SLinus Torvalds sizeof(sctp_cwrhdr_t)); 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds if (!retval) 6491da177e4SLinus Torvalds goto nodata; 6501da177e4SLinus Torvalds 6511da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6521da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6551da177e4SLinus Torvalds * 6561da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6571da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6581da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6591da177e4SLinus Torvalds * to which it is replying. 6601da177e4SLinus Torvalds * 6611da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6621da177e4SLinus Torvalds * came from.] 6631da177e4SLinus Torvalds */ 6641da177e4SLinus Torvalds if (chunk) 6651da177e4SLinus Torvalds retval->transport = chunk->transport; 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds nodata: 6681da177e4SLinus Torvalds return retval; 6691da177e4SLinus Torvalds } 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6721da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6731da177e4SLinus Torvalds const __u32 lowest_tsn) 6741da177e4SLinus Torvalds { 6751da177e4SLinus Torvalds struct sctp_chunk *retval; 6761da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 6791da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0, 6801da177e4SLinus Torvalds sizeof(sctp_ecnehdr_t)); 6811da177e4SLinus Torvalds if (!retval) 6821da177e4SLinus Torvalds goto nodata; 6831da177e4SLinus Torvalds retval->subh.ecne_hdr = 6841da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds nodata: 6871da177e4SLinus Torvalds return retval; 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 6911da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 6921da177e4SLinus Torvalds */ 6931da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 6941da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 6951da177e4SLinus Torvalds int data_len, __u8 flags, __u16 ssn) 6961da177e4SLinus Torvalds { 6971da177e4SLinus Torvalds struct sctp_chunk *retval; 6981da177e4SLinus Torvalds struct sctp_datahdr dp; 6991da177e4SLinus Torvalds int chunk_len; 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7021da177e4SLinus Torvalds * creating the chunk. 7031da177e4SLinus Torvalds */ 7041da177e4SLinus Torvalds dp.tsn = 0; 7051da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 7061da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 709eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 7101da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7111da177e4SLinus Torvalds dp.ssn = 0; 7121da177e4SLinus Torvalds } else 7131da177e4SLinus Torvalds dp.ssn = htons(ssn); 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 7161da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len); 7171da177e4SLinus Torvalds if (!retval) 7181da177e4SLinus Torvalds goto nodata; 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7211da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds nodata: 7241da177e4SLinus Torvalds return retval; 7251da177e4SLinus Torvalds } 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7281da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7291da177e4SLinus Torvalds * including duplicates and gaps. 7301da177e4SLinus Torvalds */ 7311da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7321da177e4SLinus Torvalds { 7331da177e4SLinus Torvalds struct sctp_chunk *retval; 7341da177e4SLinus Torvalds struct sctp_sackhdr sack; 7351da177e4SLinus Torvalds int len; 7361da177e4SLinus Torvalds __u32 ctsn; 7371da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7384244854dSNeil Horman struct sctp_association *aptr = (struct sctp_association *)asoc; 7391da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 74002015180SVlad Yasevich struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 7414244854dSNeil Horman struct sctp_transport *trans; 7421da177e4SLinus Torvalds 74302015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7441da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 7451da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn); 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 74802015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7491da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds /* Initialize the SACK header. */ 7521da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7531da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7541da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7551da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds len = sizeof(sack) 7581da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7591da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds /* Create the chunk. */ 7621da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len); 7631da177e4SLinus Torvalds if (!retval) 7641da177e4SLinus Torvalds goto nodata; 7651da177e4SLinus Torvalds 7661da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7671da177e4SLinus Torvalds * 7681da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7691da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7701da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7711da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7721da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7731da177e4SLinus Torvalds * reply chunk. 7741da177e4SLinus Torvalds * 7751da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 7761da177e4SLinus Torvalds * in packets from different source addresses in a single 7771da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 7781da177e4SLinus Torvalds * destination transport addresses from which the DATA or 7791da177e4SLinus Torvalds * control chunks being acknowledged were received. 7801da177e4SLinus Torvalds * 7811da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 7821da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 7831da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 7841da177e4SLinus Torvalds * duplicates. --piggy] 7851da177e4SLinus Torvalds * 7861da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 7871da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 7881da177e4SLinus Torvalds * destination address and not use the source address of the 7891da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 7901da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 7911da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 7921da177e4SLinus Torvalds * for the SACK is broken. 7931da177e4SLinus Torvalds * 7941da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 7951da177e4SLinus Torvalds */ 7961da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds retval->subh.sack_hdr = 7991da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvalds /* Add the gap ack block information. */ 8021da177e4SLinus Torvalds if (num_gabs) 8031da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 80402015180SVlad Yasevich gabs); 8051da177e4SLinus Torvalds 8061da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 8071da177e4SLinus Torvalds if (num_dup_tsns) 8081da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8091da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 8101da177e4SLinus Torvalds 8114244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8124244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8134244854dSNeil Horman * the association generation to 1 8144244854dSNeil Horman * 8154244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8164244854dSNeil Horman * association so no transport will match after a wrap event like this, 8174244854dSNeil Horman * Until the next sack 8184244854dSNeil Horman */ 8194244854dSNeil Horman if (++aptr->peer.sack_generation == 0) { 8204244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8214244854dSNeil Horman transports) 8224244854dSNeil Horman trans->sack_generation = 0; 8234244854dSNeil Horman aptr->peer.sack_generation = 1; 8244244854dSNeil Horman } 8251da177e4SLinus Torvalds nodata: 8261da177e4SLinus Torvalds return retval; 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8301da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8311da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8321da177e4SLinus Torvalds { 8331da177e4SLinus Torvalds struct sctp_chunk *retval; 8341da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 8351da177e4SLinus Torvalds __u32 ctsn; 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8381da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0, 8411da177e4SLinus Torvalds sizeof(sctp_shutdownhdr_t)); 8421da177e4SLinus Torvalds if (!retval) 8431da177e4SLinus Torvalds goto nodata; 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8461da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds if (chunk) 8491da177e4SLinus Torvalds retval->transport = chunk->transport; 8501da177e4SLinus Torvalds nodata: 8511da177e4SLinus Torvalds return retval; 8521da177e4SLinus Torvalds } 8531da177e4SLinus Torvalds 8541da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8551da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8561da177e4SLinus Torvalds { 8571da177e4SLinus Torvalds struct sctp_chunk *retval; 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8621da177e4SLinus Torvalds * 8631da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8641da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8651da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8661da177e4SLinus Torvalds * to which it is replying. 8671da177e4SLinus Torvalds * 8681da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8691da177e4SLinus Torvalds */ 8701da177e4SLinus Torvalds if (retval && chunk) 8711da177e4SLinus Torvalds retval->transport = chunk->transport; 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds return retval; 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 8771da177e4SLinus Torvalds const struct sctp_association *asoc, 8781da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8791da177e4SLinus Torvalds { 8801da177e4SLinus Torvalds struct sctp_chunk *retval; 8811da177e4SLinus Torvalds __u8 flags = 0; 8821da177e4SLinus Torvalds 883047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 884047a2428SJerome Forissier * reflected) 885047a2428SJerome Forissier */ 8861da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 8871da177e4SLinus Torvalds 8881da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8911da177e4SLinus Torvalds * 8921da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8931da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8941da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8951da177e4SLinus Torvalds * to which it is replying. 8961da177e4SLinus Torvalds * 8971da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 8981da177e4SLinus Torvalds * came from.] 8991da177e4SLinus Torvalds */ 9001da177e4SLinus Torvalds if (retval && chunk) 9011da177e4SLinus Torvalds retval->transport = chunk->transport; 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds return retval; 9041da177e4SLinus Torvalds } 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 907047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9081da177e4SLinus Torvalds */ 9091da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9101da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9111da177e4SLinus Torvalds const size_t hint) 9121da177e4SLinus Torvalds { 9131da177e4SLinus Torvalds struct sctp_chunk *retval; 9141da177e4SLinus Torvalds __u8 flags = 0; 9151da177e4SLinus Torvalds 916047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 917047a2428SJerome Forissier * an INIT (vtag will be reflected). 918047a2428SJerome Forissier */ 919047a2428SJerome Forissier if (!asoc) { 920047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 921047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 922047a2428SJerome Forissier flags = 0; 923047a2428SJerome Forissier else 924047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 925047a2428SJerome Forissier } 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint); 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9301da177e4SLinus Torvalds * 9311da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9321da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9331da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9341da177e4SLinus Torvalds * to which it is replying. 9351da177e4SLinus Torvalds * 9361da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9371da177e4SLinus Torvalds */ 9381da177e4SLinus Torvalds if (retval && chunk) 9391da177e4SLinus Torvalds retval->transport = chunk->transport; 9401da177e4SLinus Torvalds 9411da177e4SLinus Torvalds return retval; 9421da177e4SLinus Torvalds } 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9451da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9461da177e4SLinus Torvalds const struct sctp_association *asoc, 9471da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 9481da177e4SLinus Torvalds { 9491da177e4SLinus Torvalds struct sctp_chunk *retval; 9509f81bcd9SAl Viro __be32 payload; 9511da177e4SLinus Torvalds 9521da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9531da177e4SLinus Torvalds + sizeof(tsn)); 9541da177e4SLinus Torvalds 9551da177e4SLinus Torvalds if (!retval) 9561da177e4SLinus Torvalds goto no_mem; 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9591da177e4SLinus Torvalds payload = htonl(tsn); 96000f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 96100f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9621da177e4SLinus Torvalds 9631da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9641da177e4SLinus Torvalds * 9651da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9661da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9671da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9681da177e4SLinus Torvalds * to which it is replying. 9691da177e4SLinus Torvalds * 9701da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9711da177e4SLinus Torvalds */ 9721da177e4SLinus Torvalds if (chunk) 9731da177e4SLinus Torvalds retval->transport = chunk->transport; 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds no_mem: 9761da177e4SLinus Torvalds return retval; 9771da177e4SLinus Torvalds } 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 9801da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 981c164a9baSSridhar Samudrala const struct msghdr *msg, 982c164a9baSSridhar Samudrala size_t paylen) 9831da177e4SLinus Torvalds { 9841da177e4SLinus Torvalds struct sctp_chunk *retval; 985c164a9baSSridhar Samudrala void *payload = NULL; 986c164a9baSSridhar Samudrala int err; 9871da177e4SLinus Torvalds 988c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 9891da177e4SLinus Torvalds if (!retval) 9901da177e4SLinus Torvalds goto err_chunk; 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds if (paylen) { 9931da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 994c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 9951da177e4SLinus Torvalds if (!payload) 9961da177e4SLinus Torvalds goto err_payload; 9971da177e4SLinus Torvalds 998c164a9baSSridhar Samudrala err = memcpy_fromiovec(payload, msg->msg_iov, paylen); 999c164a9baSSridhar Samudrala if (err < 0) 10001da177e4SLinus Torvalds goto err_copy; 10011da177e4SLinus Torvalds } 10021da177e4SLinus Torvalds 100300f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 100400f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10051da177e4SLinus Torvalds 10061da177e4SLinus Torvalds if (paylen) 10071da177e4SLinus Torvalds kfree(payload); 10081da177e4SLinus Torvalds 10091da177e4SLinus Torvalds return retval; 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds err_copy: 10121da177e4SLinus Torvalds kfree(payload); 10131da177e4SLinus Torvalds err_payload: 10141da177e4SLinus Torvalds sctp_chunk_free(retval); 10151da177e4SLinus Torvalds retval = NULL; 10161da177e4SLinus Torvalds err_chunk: 10171da177e4SLinus Torvalds return retval; 10181da177e4SLinus Torvalds } 10191da177e4SLinus Torvalds 10205c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10215c94bf86SAdrian Bunk * enough. 10225c94bf86SAdrian Bunk */ 10235c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10245c94bf86SAdrian Bunk const void *data) 10255c94bf86SAdrian Bunk { 10265c94bf86SAdrian Bunk void *target; 10275c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 10285c94bf86SAdrian Bunk 10295c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10305c94bf86SAdrian Bunk 10316383cfb3SVlad Yasevich if (data) 10325c94bf86SAdrian Bunk memcpy(target, data, len); 10336383cfb3SVlad Yasevich else 10346383cfb3SVlad Yasevich memset(target, 0, len); 10355c94bf86SAdrian Bunk 10365c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10375c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10385c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10395c94bf86SAdrian Bunk 10405c94bf86SAdrian Bunk return target; 10415c94bf86SAdrian Bunk } 10425c94bf86SAdrian Bunk 10431da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10441da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10451da177e4SLinus Torvalds const struct sctp_association *asoc, 10461da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10471da177e4SLinus Torvalds const __u8 *payload, 10481da177e4SLinus Torvalds const size_t paylen) 10491da177e4SLinus Torvalds { 10501da177e4SLinus Torvalds struct sctp_chunk *retval; 10511da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10521da177e4SLinus Torvalds 10531da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 105400f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10551da177e4SLinus Torvalds if (!retval) 10561da177e4SLinus Torvalds goto end; 10571da177e4SLinus Torvalds 105800f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 105900f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10601da177e4SLinus Torvalds 10611da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10621da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 106300f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 106400f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 10651da177e4SLinus Torvalds 10661da177e4SLinus Torvalds end: 10671da177e4SLinus Torvalds return retval; 10681da177e4SLinus Torvalds } 10691da177e4SLinus Torvalds 1070ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1071ba016670SWei Yongjun const struct sctp_association *asoc, 1072ba016670SWei Yongjun const struct sctp_chunk *chunk, 1073ba016670SWei Yongjun struct sctp_paramhdr *param) 1074ba016670SWei Yongjun { 1075ba016670SWei Yongjun struct sctp_chunk *retval; 1076ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1077ba016670SWei Yongjun size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + 1078ba016670SWei Yongjun sizeof(sctp_paramhdr_t); 1079ba016670SWei Yongjun 1080ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1081ba016670SWei Yongjun if (!retval) 1082ba016670SWei Yongjun goto nodata; 1083ba016670SWei Yongjun 1084ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 1085ba016670SWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 1086ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 1087ba016670SWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); 1088ba016670SWei Yongjun 1089ba016670SWei Yongjun nodata: 1090ba016670SWei Yongjun return retval; 1091ba016670SWei Yongjun } 1092ba016670SWei Yongjun 10931da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 10941da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 109592c73af5SWei Yongjun const struct sctp_transport *transport) 10961da177e4SLinus Torvalds { 109792c73af5SWei Yongjun struct sctp_chunk *retval; 109892c73af5SWei Yongjun sctp_sender_hb_info_t hbinfo; 109992c73af5SWei Yongjun 110092c73af5SWei Yongjun retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 0, sizeof(hbinfo)); 11011da177e4SLinus Torvalds 11021da177e4SLinus Torvalds if (!retval) 11031da177e4SLinus Torvalds goto nodata; 11041da177e4SLinus Torvalds 110592c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 110692c73af5SWei Yongjun hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t)); 110792c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 110892c73af5SWei Yongjun hbinfo.sent_at = jiffies; 110992c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 111092c73af5SWei Yongjun 11111da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11121da177e4SLinus Torvalds * what transport it belongs to. 11131da177e4SLinus Torvalds */ 11141da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 111592c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 111692c73af5SWei Yongjun &hbinfo); 11171da177e4SLinus Torvalds 11181da177e4SLinus Torvalds nodata: 11191da177e4SLinus Torvalds return retval; 11201da177e4SLinus Torvalds } 11211da177e4SLinus Torvalds 11221da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11231da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11241da177e4SLinus Torvalds const void *payload, const size_t paylen) 11251da177e4SLinus Torvalds { 11261da177e4SLinus Torvalds struct sctp_chunk *retval; 11271da177e4SLinus Torvalds 11281da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); 11291da177e4SLinus Torvalds if (!retval) 11301da177e4SLinus Torvalds goto nodata; 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11331da177e4SLinus Torvalds 11341da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11351da177e4SLinus Torvalds * 11361da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11371da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11381da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11391da177e4SLinus Torvalds * to which it is replying. 11401da177e4SLinus Torvalds * 11411da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 11421da177e4SLinus Torvalds */ 11431da177e4SLinus Torvalds if (chunk) 11441da177e4SLinus Torvalds retval->transport = chunk->transport; 11451da177e4SLinus Torvalds 11461da177e4SLinus Torvalds nodata: 11471da177e4SLinus Torvalds return retval; 11481da177e4SLinus Torvalds } 11491da177e4SLinus Torvalds 11501da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 11511da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 11521da177e4SLinus Torvalds */ 11531da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 11541da177e4SLinus Torvalds const struct sctp_association *asoc, 11551da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11561da177e4SLinus Torvalds size_t size) 11571da177e4SLinus Torvalds { 11581da177e4SLinus Torvalds struct sctp_chunk *retval; 11591da177e4SLinus Torvalds 11601da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0, 11611da177e4SLinus Torvalds sizeof(sctp_errhdr_t) + size); 11621da177e4SLinus Torvalds if (!retval) 11631da177e4SLinus Torvalds goto nodata; 11641da177e4SLinus Torvalds 11651da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11661da177e4SLinus Torvalds * 11671da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11681da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 11691da177e4SLinus Torvalds * address from which it received the DATA or control chunk 11701da177e4SLinus Torvalds * to which it is replying. 11711da177e4SLinus Torvalds * 11721da177e4SLinus Torvalds */ 11731da177e4SLinus Torvalds if (chunk) 11741da177e4SLinus Torvalds retval->transport = chunk->transport; 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds nodata: 11771da177e4SLinus Torvalds return retval; 11781da177e4SLinus Torvalds } 11791da177e4SLinus Torvalds 11805fa782c2SNeil Horman /* Create an Operation Error chunk of a fixed size, 11815fa782c2SNeil Horman * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) 11825fa782c2SNeil Horman * This is a helper function to allocate an error chunk for 11835fa782c2SNeil Horman * for those invalid parameter codes in which we may not want 11845fa782c2SNeil Horman * to report all the errors, if the incomming chunk is large 11855fa782c2SNeil Horman */ 11865fa782c2SNeil Horman static inline struct sctp_chunk *sctp_make_op_error_fixed( 11875fa782c2SNeil Horman const struct sctp_association *asoc, 11885fa782c2SNeil Horman const struct sctp_chunk *chunk) 11895fa782c2SNeil Horman { 11905fa782c2SNeil Horman size_t size = asoc ? asoc->pathmtu : 0; 11915fa782c2SNeil Horman 11925fa782c2SNeil Horman if (!size) 11935fa782c2SNeil Horman size = SCTP_DEFAULT_MAXSEGMENT; 11945fa782c2SNeil Horman 11955fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 11965fa782c2SNeil Horman } 11975fa782c2SNeil Horman 11981da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 11991da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12001da177e4SLinus Torvalds const struct sctp_chunk *chunk, 120163706c5cSAl Viro __be16 cause_code, const void *payload, 12026383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12031da177e4SLinus Torvalds { 12041da177e4SLinus Torvalds struct sctp_chunk *retval; 12051da177e4SLinus Torvalds 12066383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12071da177e4SLinus Torvalds if (!retval) 12081da177e4SLinus Torvalds goto nodata; 12091da177e4SLinus Torvalds 12106383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 121100f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12126383cfb3SVlad Yasevich if (reserve_tail) 12136383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12141da177e4SLinus Torvalds 12151da177e4SLinus Torvalds nodata: 12161da177e4SLinus Torvalds return retval; 12171da177e4SLinus Torvalds } 12181da177e4SLinus Torvalds 12194cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 12204cd57c80SVlad Yasevich { 12214cd57c80SVlad Yasevich struct sctp_chunk *retval; 12224cd57c80SVlad Yasevich struct sctp_hmac *hmac_desc; 12234cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 12244cd57c80SVlad Yasevich __u8 *hmac; 12254cd57c80SVlad Yasevich 12264cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12274cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12284cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12294cd57c80SVlad Yasevich return NULL; 12304cd57c80SVlad Yasevich 12314cd57c80SVlad Yasevich retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0, 12324cd57c80SVlad Yasevich hmac_desc->hmac_len + sizeof(sctp_authhdr_t)); 12334cd57c80SVlad Yasevich if (!retval) 12344cd57c80SVlad Yasevich return NULL; 12354cd57c80SVlad Yasevich 12364cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 12374cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 12384cd57c80SVlad Yasevich 12394cd57c80SVlad Yasevich retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), 12404cd57c80SVlad Yasevich &auth_hdr); 12414cd57c80SVlad Yasevich 12424cd57c80SVlad Yasevich hmac = skb_put(retval->skb, hmac_desc->hmac_len); 12434cd57c80SVlad Yasevich memset(hmac, 0, hmac_desc->hmac_len); 12444cd57c80SVlad Yasevich 12454cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 12464cd57c80SVlad Yasevich retval->chunk_hdr->length = 12474cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 12484cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 12494cd57c80SVlad Yasevich 12504cd57c80SVlad Yasevich return retval; 12514cd57c80SVlad Yasevich } 12524cd57c80SVlad Yasevich 12534cd57c80SVlad Yasevich 12541da177e4SLinus Torvalds /******************************************************************** 12551da177e4SLinus Torvalds * 2nd Level Abstractions 12561da177e4SLinus Torvalds ********************************************************************/ 12571da177e4SLinus Torvalds 12581da177e4SLinus Torvalds /* Turn an skb into a chunk. 12591da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 12601da177e4SLinus Torvalds */ 12611da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 12621da177e4SLinus Torvalds const struct sctp_association *asoc, 12631da177e4SLinus Torvalds struct sock *sk) 12641da177e4SLinus Torvalds { 12651da177e4SLinus Torvalds struct sctp_chunk *retval; 12661da177e4SLinus Torvalds 1267c3762229SRobert P. J. Day retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC); 12681da177e4SLinus Torvalds 12691da177e4SLinus Torvalds if (!retval) 12701da177e4SLinus Torvalds goto nodata; 12711da177e4SLinus Torvalds 12721da177e4SLinus Torvalds if (!sk) { 12731da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb); 12741da177e4SLinus Torvalds } 12751da177e4SLinus Torvalds 127679af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 12771da177e4SLinus Torvalds retval->skb = skb; 12781da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 12791da177e4SLinus Torvalds retval->has_tsn = 0; 12801da177e4SLinus Torvalds retval->has_ssn = 0; 12811da177e4SLinus Torvalds retval->rtt_in_progress = 0; 12821da177e4SLinus Torvalds retval->sent_at = 0; 12831da177e4SLinus Torvalds retval->singleton = 1; 12841da177e4SLinus Torvalds retval->end_of_packet = 0; 12851da177e4SLinus Torvalds retval->ecn_ce_done = 0; 12861da177e4SLinus Torvalds retval->pdiscard = 0; 12871da177e4SLinus Torvalds 12881da177e4SLinus Torvalds /* sctpimpguide-05.txt Section 2.8.2 12891da177e4SLinus Torvalds * M1) Each time a new DATA chunk is transmitted 12901da177e4SLinus Torvalds * set the 'TSN.Missing.Report' count for that TSN to 0. The 12911da177e4SLinus Torvalds * 'TSN.Missing.Report' count will be used to determine missing chunks 12921da177e4SLinus Torvalds * and when to fast retransmit. 12931da177e4SLinus Torvalds */ 12941da177e4SLinus Torvalds retval->tsn_missing_report = 0; 12951da177e4SLinus Torvalds retval->tsn_gap_acked = 0; 1296c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 12971da177e4SLinus Torvalds 12981da177e4SLinus Torvalds /* If this is a fragmented message, track all fragments 12991da177e4SLinus Torvalds * of the message (for SEND_FAILED). 13001da177e4SLinus Torvalds */ 13011da177e4SLinus Torvalds retval->msg = NULL; 13021da177e4SLinus Torvalds 13031da177e4SLinus Torvalds /* Polish the bead hole. */ 13041da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13051da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13061da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 13071da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds nodata: 13101da177e4SLinus Torvalds return retval; 13111da177e4SLinus Torvalds } 13121da177e4SLinus Torvalds 13131da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13141da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13151da177e4SLinus Torvalds union sctp_addr *dest) 13161da177e4SLinus Torvalds { 1317f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 131816b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13191da177e4SLinus Torvalds } 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13221da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13231da177e4SLinus Torvalds { 13241da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13251da177e4SLinus Torvalds if (chunk->transport) { 13266a1e5f33SAl Viro return &chunk->transport->ipaddr; 13271da177e4SLinus Torvalds } else { 13281da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13296a1e5f33SAl Viro return &chunk->source; 13301da177e4SLinus Torvalds } 13311da177e4SLinus Torvalds } 13321da177e4SLinus Torvalds 13331da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13341da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13351da177e4SLinus Torvalds */ 13361da177e4SLinus Torvalds SCTP_STATIC 13371da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 13381da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen) 13391da177e4SLinus Torvalds { 13401da177e4SLinus Torvalds struct sctp_chunk *retval; 13411da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 13421da177e4SLinus Torvalds struct sk_buff *skb; 13431da177e4SLinus Torvalds struct sock *sk; 13441da177e4SLinus Torvalds 13451da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 13461da177e4SLinus Torvalds skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), 13471da177e4SLinus Torvalds GFP_ATOMIC); 13481da177e4SLinus Torvalds if (!skb) 13491da177e4SLinus Torvalds goto nodata; 13501da177e4SLinus Torvalds 13511da177e4SLinus Torvalds /* Make room for the chunk header. */ 13521da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 13531da177e4SLinus Torvalds chunk_hdr->type = type; 13541da177e4SLinus Torvalds chunk_hdr->flags = flags; 13551da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 13561da177e4SLinus Torvalds 13571da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 13581da177e4SLinus Torvalds retval = sctp_chunkify(skb, asoc, sk); 13591da177e4SLinus Torvalds if (!retval) { 13601da177e4SLinus Torvalds kfree_skb(skb); 13611da177e4SLinus Torvalds goto nodata; 13621da177e4SLinus Torvalds } 13631da177e4SLinus Torvalds 13641da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 13651da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 13661da177e4SLinus Torvalds 13674cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 13684cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 13694cd57c80SVlad Yasevich retval->auth = 1; 13704cd57c80SVlad Yasevich 13711da177e4SLinus Torvalds /* Set the skb to the belonging sock for accounting. */ 13721da177e4SLinus Torvalds skb->sk = sk; 13731da177e4SLinus Torvalds 13741da177e4SLinus Torvalds return retval; 13751da177e4SLinus Torvalds nodata: 13761da177e4SLinus Torvalds return NULL; 13771da177e4SLinus Torvalds } 13781da177e4SLinus Torvalds 13791da177e4SLinus Torvalds 13801da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 13811da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 13821da177e4SLinus Torvalds { 1383a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1384a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1385a08de64dSVlad Yasevich 13861da177e4SLinus Torvalds /* Free the chunk skb data and the SCTP_chunk stub itself. */ 13871da177e4SLinus Torvalds dev_kfree_skb(chunk->skb); 13881da177e4SLinus Torvalds 13891da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 13901da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 13911da177e4SLinus Torvalds } 13921da177e4SLinus Torvalds 13931da177e4SLinus Torvalds /* Possibly, free the chunk. */ 13941da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 13951da177e4SLinus Torvalds { 13961da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 13971da177e4SLinus Torvalds if (chunk->msg) 13981da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 13991da177e4SLinus Torvalds 14001da177e4SLinus Torvalds sctp_chunk_put(chunk); 14011da177e4SLinus Torvalds } 14021da177e4SLinus Torvalds 14031da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14041da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14051da177e4SLinus Torvalds { 14061da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 14071da177e4SLinus Torvalds } 14081da177e4SLinus Torvalds 14091da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14101da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14111da177e4SLinus Torvalds { 14121da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 14131da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14141da177e4SLinus Torvalds } 14151da177e4SLinus Torvalds 14161da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14171da177e4SLinus Torvalds * enough. 14181da177e4SLinus Torvalds */ 14191da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14201da177e4SLinus Torvalds { 14211da177e4SLinus Torvalds void *target; 14221da177e4SLinus Torvalds void *padding; 14231da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 14248d614adeSWei Yongjun int padlen = WORD_ROUND(chunklen) - chunklen; 14251da177e4SLinus Torvalds 14261da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 14271da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14281da177e4SLinus Torvalds 14291da177e4SLinus Torvalds memset(padding, 0, padlen); 14301da177e4SLinus Torvalds memcpy(target, data, len); 14311da177e4SLinus Torvalds 14321da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14331da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 143427a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14351da177e4SLinus Torvalds 14361da177e4SLinus Torvalds return target; 14371da177e4SLinus Torvalds } 14381da177e4SLinus Torvalds 14395fa782c2SNeil Horman /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient 14405fa782c2SNeil Horman * space in the chunk 14415fa782c2SNeil Horman */ 14425fa782c2SNeil Horman void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, 14435fa782c2SNeil Horman int len, const void *data) 14445fa782c2SNeil Horman { 14452e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) >= len) 14465fa782c2SNeil Horman return sctp_addto_chunk(chunk, len, data); 14475fa782c2SNeil Horman else 14485fa782c2SNeil Horman return NULL; 14495fa782c2SNeil Horman } 14505fa782c2SNeil Horman 14511da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 14521da177e4SLinus Torvalds * chunk is not big enough. 14531da177e4SLinus Torvalds * Returns a kernel err value. 14541da177e4SLinus Torvalds */ 14551da177e4SLinus Torvalds int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 14561da177e4SLinus Torvalds struct iovec *data) 14571da177e4SLinus Torvalds { 14581da177e4SLinus Torvalds __u8 *target; 14591da177e4SLinus Torvalds int err = 0; 14601da177e4SLinus Torvalds 14611da177e4SLinus Torvalds /* Make room in chunk for data. */ 14621da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14631da177e4SLinus Torvalds 14641da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 14651da177e4SLinus Torvalds if ((err = memcpy_fromiovecend(target, data, off, len))) 14661da177e4SLinus Torvalds goto out; 14671da177e4SLinus Torvalds 14681da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14691da177e4SLinus Torvalds chunk->chunk_hdr->length = 14701da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 147127a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14721da177e4SLinus Torvalds 14731da177e4SLinus Torvalds out: 14741da177e4SLinus Torvalds return err; 14751da177e4SLinus Torvalds } 14761da177e4SLinus Torvalds 14771da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 14781da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 14791da177e4SLinus Torvalds */ 14801da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 14811da177e4SLinus Torvalds { 1482ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1483ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1484ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 14851da177e4SLinus Torvalds __u16 ssn; 14861da177e4SLinus Torvalds __u16 sid; 14871da177e4SLinus Torvalds 14881da177e4SLinus Torvalds if (chunk->has_ssn) 14891da177e4SLinus Torvalds return; 14901da177e4SLinus Torvalds 1491ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1492ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1493ab3e5e7bSVlad Yasevich stream = &chunk->asoc->ssnmap->out; 1494ab3e5e7bSVlad Yasevich 1495ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1496ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1497ab3e5e7bSVlad Yasevich */ 1498ab3e5e7bSVlad Yasevich msg = chunk->msg; 1499ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1500ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15011da177e4SLinus Torvalds ssn = 0; 15021da177e4SLinus Torvalds } else { 1503ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1504ab3e5e7bSVlad Yasevich ssn = sctp_ssn_next(stream, sid); 15051da177e4SLinus Torvalds else 1506ab3e5e7bSVlad Yasevich ssn = sctp_ssn_peek(stream, sid); 15071da177e4SLinus Torvalds } 15081da177e4SLinus Torvalds 1509ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1510ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1511ab3e5e7bSVlad Yasevich } 15121da177e4SLinus Torvalds } 15131da177e4SLinus Torvalds 15141da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15151da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15161da177e4SLinus Torvalds */ 15171da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15181da177e4SLinus Torvalds { 15191da177e4SLinus Torvalds if (!chunk->has_tsn) { 15201da177e4SLinus Torvalds /* This is the last possible instant to 15211da177e4SLinus Torvalds * assign a TSN. 15221da177e4SLinus Torvalds */ 15231da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15241da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15251da177e4SLinus Torvalds chunk->has_tsn = 1; 15261da177e4SLinus Torvalds } 15271da177e4SLinus Torvalds } 15281da177e4SLinus Torvalds 15291da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15301da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15313182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1532dd0fc66fSAl Viro gfp_t gfp) 15331da177e4SLinus Torvalds { 15341da177e4SLinus Torvalds struct sctp_association *asoc; 15351da177e4SLinus Torvalds struct sk_buff *skb; 15361da177e4SLinus Torvalds sctp_scope_t scope; 15371da177e4SLinus Torvalds struct sctp_af *af; 15381da177e4SLinus Torvalds 15391da177e4SLinus Torvalds /* Create the bare association. */ 15401da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15411da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15421da177e4SLinus Torvalds if (!asoc) 15431da177e4SLinus Torvalds goto nodata; 15441da177e4SLinus Torvalds asoc->temp = 1; 15451da177e4SLinus Torvalds skb = chunk->skb; 15461da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1547eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); 15481da177e4SLinus Torvalds if (unlikely(!af)) 15491da177e4SLinus Torvalds goto fail; 1550d55c41b1SAl Viro af->from_skb(&asoc->c.peer_addr, skb, 1); 15511da177e4SLinus Torvalds nodata: 15521da177e4SLinus Torvalds return asoc; 15531da177e4SLinus Torvalds 15541da177e4SLinus Torvalds fail: 15551da177e4SLinus Torvalds sctp_association_free(asoc); 15561da177e4SLinus Torvalds return NULL; 15571da177e4SLinus Torvalds } 15581da177e4SLinus Torvalds 15591da177e4SLinus Torvalds /* Build a cookie representing asoc. 15601da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 15611da177e4SLinus Torvalds */ 15621da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 15631da177e4SLinus Torvalds const struct sctp_association *asoc, 15641da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 15651da177e4SLinus Torvalds int *cookie_len, 15661da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 15671da177e4SLinus Torvalds { 15681da177e4SLinus Torvalds sctp_cookie_param_t *retval; 15691da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 15701da177e4SLinus Torvalds struct scatterlist sg; 15711da177e4SLinus Torvalds int headersize, bodysize; 15721da177e4SLinus Torvalds unsigned int keylen; 15731da177e4SLinus Torvalds char *key; 15741da177e4SLinus Torvalds 15759834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 15769834a2bbSVlad Yasevich * any padding. 15779834a2bbSVlad Yasevich */ 15789834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 15799834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 15809834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 15811da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 15821da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 15831da177e4SLinus Torvalds 15841da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 15851da177e4SLinus Torvalds * functions simpler to write. 15861da177e4SLinus Torvalds */ 15871da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 15881da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 15891da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 15901da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 15911da177e4SLinus Torvalds 15921da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 15931da177e4SLinus Torvalds * out on the network. 15941da177e4SLinus Torvalds */ 1595af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1596af997d8cSArnaldo Carvalho de Melo if (!retval) 1597af997d8cSArnaldo Carvalho de Melo goto nodata; 1598af997d8cSArnaldo Carvalho de Melo 15991da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16001da177e4SLinus Torvalds 16011da177e4SLinus Torvalds /* Set up the parameter header. */ 16021da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16031da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16061da177e4SLinus Torvalds cookie->c = asoc->c; 16071da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16081da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16091da177e4SLinus Torvalds 16101da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16111da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16121da177e4SLinus Torvalds 16130f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16140f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16151da177e4SLinus Torvalds 16161da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 16171da177e4SLinus Torvalds do_gettimeofday(&cookie->c.expiration); 16181da177e4SLinus Torvalds TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration); 16191da177e4SLinus Torvalds 16201da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16211da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16221da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16231da177e4SLinus Torvalds 16241da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16251da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16261da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16271da177e4SLinus Torvalds 16281da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16291b489e11SHerbert Xu struct hash_desc desc; 16301b489e11SHerbert Xu 16311da177e4SLinus Torvalds /* Sign the message. */ 163268e3f5ddSHerbert Xu sg_init_one(&sg, &cookie->c, bodysize); 16331da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 16341da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 16351b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 16361b489e11SHerbert Xu desc.flags = 0; 16371da177e4SLinus Torvalds 16381b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 16391b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) 16401b489e11SHerbert Xu goto free_cookie; 16411da177e4SLinus Torvalds } 16421da177e4SLinus Torvalds 16431da177e4SLinus Torvalds return retval; 16441b489e11SHerbert Xu 16451b489e11SHerbert Xu free_cookie: 16461b489e11SHerbert Xu kfree(retval); 16471b489e11SHerbert Xu nodata: 16481b489e11SHerbert Xu *cookie_len = 0; 16491b489e11SHerbert Xu return NULL; 16501da177e4SLinus Torvalds } 16511da177e4SLinus Torvalds 16521da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 16531da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 16541da177e4SLinus Torvalds const struct sctp_endpoint *ep, 16551da177e4SLinus Torvalds const struct sctp_association *asoc, 1656dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 16571da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 16581da177e4SLinus Torvalds { 16591da177e4SLinus Torvalds struct sctp_association *retval = NULL; 16601da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 16611da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 16621da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1663313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 16641da177e4SLinus Torvalds struct scatterlist sg; 16651da177e4SLinus Torvalds unsigned int keylen, len; 16661da177e4SLinus Torvalds char *key; 16671da177e4SLinus Torvalds sctp_scope_t scope; 16681da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1669a61bbcf2SPatrick McHardy struct timeval tv; 16701b489e11SHerbert Xu struct hash_desc desc; 16711da177e4SLinus Torvalds 16729834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16739834a2bbSVlad Yasevich * any padding. 16749834a2bbSVlad Yasevich */ 16759834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 16769834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16779834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16781da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 16791da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 16801da177e4SLinus Torvalds 16811da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 16821da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 16831da177e4SLinus Torvalds * INIT chunk. 16841da177e4SLinus Torvalds */ 16851da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 16861da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 16871da177e4SLinus Torvalds goto malformed; 16881da177e4SLinus Torvalds 16891da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 16901da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16911da177e4SLinus Torvalds goto malformed; 16921da177e4SLinus Torvalds 16931da177e4SLinus Torvalds /* Process the cookie. */ 16941da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 16951da177e4SLinus Torvalds bear_cookie = &cookie->c; 16961da177e4SLinus Torvalds 16971da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 16981da177e4SLinus Torvalds goto no_hmac; 16991da177e4SLinus Torvalds 17001da177e4SLinus Torvalds /* Check the signature. */ 17011da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 170268e3f5ddSHerbert Xu sg_init_one(&sg, bear_cookie, bodysize); 17031da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 17041b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 17051b489e11SHerbert Xu desc.flags = 0; 17061da177e4SLinus Torvalds 17078ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 17081b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 17091b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 17101b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17111b489e11SHerbert Xu goto fail; 17121b489e11SHerbert Xu } 17131da177e4SLinus Torvalds 17141da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17151da177e4SLinus Torvalds /* Try the previous key. */ 17161da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->last_key]; 17178ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 17181b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 17191b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 17201b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17211b489e11SHerbert Xu goto fail; 17221b489e11SHerbert Xu } 17231da177e4SLinus Torvalds 17241da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17251da177e4SLinus Torvalds /* Yikes! Still bad signature! */ 17261da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17271da177e4SLinus Torvalds goto fail; 17281da177e4SLinus Torvalds } 17291da177e4SLinus Torvalds } 17301da177e4SLinus Torvalds 17311da177e4SLinus Torvalds no_hmac: 17321da177e4SLinus Torvalds /* IG Section 2.35.2: 17331da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17341da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17351da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17361da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17371da177e4SLinus Torvalds * discarded, 17381da177e4SLinus Torvalds */ 17391da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17401da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17411da177e4SLinus Torvalds goto fail; 17421da177e4SLinus Torvalds } 17431da177e4SLinus Torvalds 17449b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17451da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17461da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17471da177e4SLinus Torvalds goto fail; 17481da177e4SLinus Torvalds } 17491da177e4SLinus Torvalds 17501da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17511da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17521da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1753f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1754f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1755f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1756f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17571da177e4SLinus Torvalds */ 1758f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 1759a61bbcf2SPatrick McHardy skb_get_timestamp(skb, &tv); 1760f236218bSVlad Yasevich else 1761f236218bSVlad Yasevich do_gettimeofday(&tv); 1762f236218bSVlad Yasevich 1763a61bbcf2SPatrick McHardy if (!asoc && tv_lt(bear_cookie->expiration, tv)) { 17641da177e4SLinus Torvalds /* 17651da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 17661da177e4SLinus Torvalds * 17671da177e4SLinus Torvalds * Cause of error 17681da177e4SLinus Torvalds * --------------- 17691da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 17701da177e4SLinus Torvalds * Cookie that has expired. 17711da177e4SLinus Torvalds */ 17721da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17731da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 17741da177e4SLinus Torvalds if (*errp) { 1775a61bbcf2SPatrick McHardy suseconds_t usecs = (tv.tv_sec - 17761da177e4SLinus Torvalds bear_cookie->expiration.tv_sec) * 1000000L + 1777a61bbcf2SPatrick McHardy tv.tv_usec - bear_cookie->expiration.tv_usec; 177834bcca28SAl Viro __be32 n = htonl(usecs); 17791da177e4SLinus Torvalds 17801da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 178100f1c2dfSWei Yongjun sizeof(n)); 178200f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 17831da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 17841da177e4SLinus Torvalds } else 17851da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds goto fail; 17881da177e4SLinus Torvalds } 17891da177e4SLinus Torvalds 17901da177e4SLinus Torvalds /* Make a new base association. */ 17911da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 17921da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 17931da177e4SLinus Torvalds if (!retval) { 17941da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17951da177e4SLinus Torvalds goto fail; 17961da177e4SLinus Torvalds } 17971da177e4SLinus Torvalds 17981da177e4SLinus Torvalds /* Set up our peer's port number. */ 17991da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18001da177e4SLinus Torvalds 18011da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18021da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18031da177e4SLinus Torvalds 18041da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18051da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18061da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18071da177e4SLinus Torvalds goto fail; 18081da177e4SLinus Torvalds } 18091da177e4SLinus Torvalds 18101da177e4SLinus Torvalds /* Also, add the destination address. */ 18111da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1812f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1813f57d96b2SVlad Yasevich SCTP_ADDR_SRC, GFP_ATOMIC); 18141da177e4SLinus Torvalds } 18151da177e4SLinus Torvalds 18161da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18171da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18181da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 18191da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18201da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18210f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18221da177e4SLinus Torvalds 18231da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18241da177e4SLinus Torvalds return retval; 18251da177e4SLinus Torvalds 18261da177e4SLinus Torvalds fail: 18271da177e4SLinus Torvalds if (retval) 18281da177e4SLinus Torvalds sctp_association_free(retval); 18291da177e4SLinus Torvalds 18301da177e4SLinus Torvalds return NULL; 18311da177e4SLinus Torvalds 18321da177e4SLinus Torvalds malformed: 18331da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18341da177e4SLinus Torvalds * malformed. 18351da177e4SLinus Torvalds */ 18361da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18371da177e4SLinus Torvalds goto fail; 18381da177e4SLinus Torvalds } 18391da177e4SLinus Torvalds 18401da177e4SLinus Torvalds /******************************************************************** 18411da177e4SLinus Torvalds * 3rd Level Abstractions 18421da177e4SLinus Torvalds ********************************************************************/ 18431da177e4SLinus Torvalds 18441da177e4SLinus Torvalds struct __sctp_missing { 18459f81bcd9SAl Viro __be32 num_missing; 18469f81bcd9SAl Viro __be16 type; 1847bc10502dSEric Dumazet } __packed; 18481da177e4SLinus Torvalds 18491da177e4SLinus Torvalds /* 18501da177e4SLinus Torvalds * Report a missing mandatory parameter. 18511da177e4SLinus Torvalds */ 18521da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 18531da177e4SLinus Torvalds sctp_param_t paramtype, 18541da177e4SLinus Torvalds struct sctp_chunk *chunk, 18551da177e4SLinus Torvalds struct sctp_chunk **errp) 18561da177e4SLinus Torvalds { 18571da177e4SLinus Torvalds struct __sctp_missing report; 18581da177e4SLinus Torvalds __u16 len; 18591da177e4SLinus Torvalds 18601da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 18611da177e4SLinus Torvalds 18621da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 18631da177e4SLinus Torvalds * returning multiple unknown parameters. 18641da177e4SLinus Torvalds */ 18651da177e4SLinus Torvalds if (!*errp) 18661da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18671da177e4SLinus Torvalds 18681da177e4SLinus Torvalds if (*errp) { 18691da177e4SLinus Torvalds report.num_missing = htonl(1); 18701da177e4SLinus Torvalds report.type = paramtype; 1871ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 187200f1c2dfSWei Yongjun sizeof(report)); 187300f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 18741da177e4SLinus Torvalds } 18751da177e4SLinus Torvalds 18761da177e4SLinus Torvalds /* Stop processing this chunk. */ 18771da177e4SLinus Torvalds return 0; 18781da177e4SLinus Torvalds } 18791da177e4SLinus Torvalds 18801da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 18811da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 18821da177e4SLinus Torvalds struct sctp_chunk *chunk, 18831da177e4SLinus Torvalds struct sctp_chunk **errp) 18841da177e4SLinus Torvalds { 18851da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 18861da177e4SLinus Torvalds 18871da177e4SLinus Torvalds if (!*errp) 18881da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 18891da177e4SLinus Torvalds 18901da177e4SLinus Torvalds if (*errp) 189100f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 18921da177e4SLinus Torvalds 18931da177e4SLinus Torvalds /* Stop processing this chunk. */ 18941da177e4SLinus Torvalds return 0; 18951da177e4SLinus Torvalds } 18961da177e4SLinus Torvalds 18971da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 18981da177e4SLinus Torvalds struct sctp_paramhdr *param, 18991da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19001da177e4SLinus Torvalds struct sctp_chunk **errp) 19011da177e4SLinus Torvalds { 19027ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19037ab90804SVlad Yasevich * not reported. 19047ab90804SVlad Yasevich */ 19057ab90804SVlad Yasevich if (*errp) 19067ab90804SVlad Yasevich sctp_chunk_free(*errp); 19077ab90804SVlad Yasevich 19081da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1909ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19101da177e4SLinus Torvalds 19111da177e4SLinus Torvalds return 0; 19121da177e4SLinus Torvalds } 19131da177e4SLinus Torvalds 19141da177e4SLinus Torvalds 19151da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19161da177e4SLinus Torvalds * send back an indicator to the peer. 19171da177e4SLinus Torvalds */ 19181da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19191da177e4SLinus Torvalds union sctp_params param, 19201da177e4SLinus Torvalds struct sctp_chunk *chunk, 19211da177e4SLinus Torvalds struct sctp_chunk **errp) 19221da177e4SLinus Torvalds { 19231da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19241da177e4SLinus Torvalds 19257ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19267ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19277ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19287ab90804SVlad Yasevich * them in the ABORT. 19297ab90804SVlad Yasevich */ 19307ab90804SVlad Yasevich if (*errp) 19317ab90804SVlad Yasevich sctp_chunk_free(*errp); 19327ab90804SVlad Yasevich 19331da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19341da177e4SLinus Torvalds 193500f1c2dfSWei Yongjun if (*errp) { 193600f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 193700f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 193800f1c2dfSWei Yongjun } 19391da177e4SLinus Torvalds 19401da177e4SLinus Torvalds /* Stop processing this chunk. */ 19411da177e4SLinus Torvalds return 0; 19421da177e4SLinus Torvalds } 19431da177e4SLinus Torvalds 1944f53b5b09SEric W. Biederman static int sctp_verify_ext_param(struct net *net, union sctp_params param) 1945d6701191SVlad Yasevich { 1946d6701191SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1947d6701191SVlad Yasevich int have_auth = 0; 1948d6701191SVlad Yasevich int have_asconf = 0; 1949d6701191SVlad Yasevich int i; 1950d6701191SVlad Yasevich 1951d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1952d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1953d6701191SVlad Yasevich case SCTP_CID_AUTH: 1954d6701191SVlad Yasevich have_auth = 1; 1955d6701191SVlad Yasevich break; 1956d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1957d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1958d6701191SVlad Yasevich have_asconf = 1; 1959d6701191SVlad Yasevich break; 1960d6701191SVlad Yasevich } 1961d6701191SVlad Yasevich } 1962d6701191SVlad Yasevich 1963d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1964d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 1965d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 1966d6701191SVlad Yasevich * mode. 1967d6701191SVlad Yasevich */ 1968e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 1969d6701191SVlad Yasevich return 1; 1970d6701191SVlad Yasevich 1971e1fc3b14SEric W. Biederman if (net->sctp.addip_enable && !have_auth && have_asconf) 1972d6701191SVlad Yasevich return 0; 1973d6701191SVlad Yasevich 1974d6701191SVlad Yasevich return 1; 1975d6701191SVlad Yasevich } 1976d6701191SVlad Yasevich 1977131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 1978131a47e3SVlad Yasevich union sctp_params param) 1979131a47e3SVlad Yasevich { 1980e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 1981131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1982131a47e3SVlad Yasevich int i; 1983131a47e3SVlad Yasevich 1984131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 1985131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 1986131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 1987e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable && 1988131a47e3SVlad Yasevich !asoc->peer.prsctp_capable) 1989131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 1990131a47e3SVlad Yasevich break; 1991730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 1992730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 1993730fc3d0SVlad Yasevich * supports AUTH. 1994730fc3d0SVlad Yasevich */ 1995e1fc3b14SEric W. Biederman if (net->sctp.auth_enable) 1996730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 1997730fc3d0SVlad Yasevich break; 1998131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 1999131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2000e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 200188799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20026b2f9cb6SVlad Yasevich break; 2003131a47e3SVlad Yasevich default: 2004131a47e3SVlad Yasevich break; 2005131a47e3SVlad Yasevich } 2006131a47e3SVlad Yasevich } 2007131a47e3SVlad Yasevich } 2008131a47e3SVlad Yasevich 20091da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20101da177e4SLinus Torvalds * 20111da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20121da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20131da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20141da177e4SLinus Torvalds * Parameter Type. 20151da177e4SLinus Torvalds * 20167ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20177ab90804SVlad Yasevich * parameters within this chunk 20181da177e4SLinus Torvalds * 20197ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20207ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20217ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20221da177e4SLinus Torvalds * 20231da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20241da177e4SLinus Torvalds * 20251da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20261da177e4SLinus Torvalds * report the unrecognized parameter in an 20277ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20281da177e4SLinus Torvalds * 20291da177e4SLinus Torvalds * Return value: 20307ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20317ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20327ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20331da177e4SLinus Torvalds */ 20347ab90804SVlad Yasevich static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, 20351da177e4SLinus Torvalds union sctp_params param, 20361da177e4SLinus Torvalds struct sctp_chunk *chunk, 20371da177e4SLinus Torvalds struct sctp_chunk **errp) 20381da177e4SLinus Torvalds { 20397ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20401da177e4SLinus Torvalds 20411da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20421da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20437ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20441da177e4SLinus Torvalds break; 20451da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20461da177e4SLinus Torvalds break; 20477ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20487ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20497ab90804SVlad Yasevich /* Fall through */ 20501da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20511da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20521da177e4SLinus Torvalds * returning multiple unknown parameters. 20531da177e4SLinus Torvalds */ 20541da177e4SLinus Torvalds if (NULL == *errp) 20555fa782c2SNeil Horman *errp = sctp_make_op_error_fixed(asoc, chunk); 20561da177e4SLinus Torvalds 20571da177e4SLinus Torvalds if (*errp) { 20582205a6eaSJiri Bohac if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, 20592205a6eaSJiri Bohac WORD_ROUND(ntohs(param.p->length)))) 20605fa782c2SNeil Horman sctp_addto_chunk_fixed(*errp, 206100f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 206200f1c2dfSWei Yongjun param.v); 20631da177e4SLinus Torvalds } else { 20641da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 20651da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 20661da177e4SLinus Torvalds * to the peer and the association won't be 20671da177e4SLinus Torvalds * established. 20681da177e4SLinus Torvalds */ 20697ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 20701da177e4SLinus Torvalds } 20711da177e4SLinus Torvalds break; 20721da177e4SLinus Torvalds default: 20731da177e4SLinus Torvalds break; 20741da177e4SLinus Torvalds } 20751da177e4SLinus Torvalds 20761da177e4SLinus Torvalds return retval; 20771da177e4SLinus Torvalds } 20781da177e4SLinus Torvalds 20797ab90804SVlad Yasevich /* Verify variable length parameters 20801da177e4SLinus Torvalds * Return values: 20817ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 20827ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 20837ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 20847ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20851da177e4SLinus Torvalds */ 2086f53b5b09SEric W. Biederman static sctp_ierror_t sctp_verify_param(struct net *net, 2087f53b5b09SEric W. Biederman const struct sctp_association *asoc, 20881da177e4SLinus Torvalds union sctp_params param, 20891da177e4SLinus Torvalds sctp_cid_t cid, 20901da177e4SLinus Torvalds struct sctp_chunk *chunk, 20911da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 20921da177e4SLinus Torvalds { 209372da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 20947ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 209572da7b38SWei Yongjun __u16 n_elt, id = 0; 209672da7b38SWei Yongjun int i; 20971da177e4SLinus Torvalds 20981da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 20991da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21001da177e4SLinus Torvalds * identified based on the chunk id. 21011da177e4SLinus Torvalds */ 21021da177e4SLinus Torvalds 21031da177e4SLinus Torvalds switch (param.p->type) { 21041da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21051da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21061da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21071da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21081da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21091da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21101da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21111da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21120f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2113d6701191SVlad Yasevich break; 2114d6701191SVlad Yasevich 2115131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2116f53b5b09SEric W. Biederman if (!sctp_verify_ext_param(net, param)) 2117d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21181da177e4SLinus Torvalds break; 21191da177e4SLinus Torvalds 2120d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2121e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 2122d6de3097SVlad Yasevich break; 2123d6de3097SVlad Yasevich goto fallthrough; 2124d6de3097SVlad Yasevich 21251da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21261da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21277ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21287ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21297ab90804SVlad Yasevich break; 2130131a47e3SVlad Yasevich 21311da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 2132e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) 21331da177e4SLinus Torvalds break; 2134730fc3d0SVlad Yasevich goto fallthrough; 2135730fc3d0SVlad Yasevich 2136730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2137e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2138730fc3d0SVlad Yasevich goto fallthrough; 2139730fc3d0SVlad Yasevich 2140730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2141730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2142730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2143730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2144730fc3d0SVlad Yasevich */ 2145730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 21467ab90804SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { 21477ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2148730fc3d0SVlad Yasevich chunk, err_chunk); 21497ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21507ab90804SVlad Yasevich } 2151730fc3d0SVlad Yasevich break; 2152730fc3d0SVlad Yasevich 2153730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2154e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2155730fc3d0SVlad Yasevich goto fallthrough; 2156730fc3d0SVlad Yasevich 2157730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2158730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2159730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2160730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2161730fc3d0SVlad Yasevich */ 21627ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 21637ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2164730fc3d0SVlad Yasevich chunk, err_chunk); 21657ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21667ab90804SVlad Yasevich } 2167730fc3d0SVlad Yasevich break; 2168730fc3d0SVlad Yasevich 2169730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2170e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 217172da7b38SWei Yongjun goto fallthrough; 217272da7b38SWei Yongjun 217372da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 217472da7b38SWei Yongjun n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; 217572da7b38SWei Yongjun 217672da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 217772da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 217872da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 217972da7b38SWei Yongjun */ 218072da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 218172da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 218272da7b38SWei Yongjun 218372da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2184730fc3d0SVlad Yasevich break; 218572da7b38SWei Yongjun } 218672da7b38SWei Yongjun 218772da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 218872da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 218972da7b38SWei Yongjun err_chunk); 219072da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 219172da7b38SWei Yongjun } 219272da7b38SWei Yongjun break; 2193730fc3d0SVlad Yasevich fallthrough: 21941da177e4SLinus Torvalds default: 21951da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n", 21961da177e4SLinus Torvalds ntohs(param.p->type), cid); 21977ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 21981da177e4SLinus Torvalds break; 21991da177e4SLinus Torvalds } 22001da177e4SLinus Torvalds return retval; 22011da177e4SLinus Torvalds } 22021da177e4SLinus Torvalds 22031da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2204f53b5b09SEric W. Biederman int sctp_verify_init(struct net *net, const struct sctp_association *asoc, 22051da177e4SLinus Torvalds sctp_cid_t cid, 22061da177e4SLinus Torvalds sctp_init_chunk_t *peer_init, 22071da177e4SLinus Torvalds struct sctp_chunk *chunk, 22081da177e4SLinus Torvalds struct sctp_chunk **errp) 22091da177e4SLinus Torvalds { 22101da177e4SLinus Torvalds union sctp_params param; 22111da177e4SLinus Torvalds int has_cookie = 0; 22127ab90804SVlad Yasevich int result; 22131da177e4SLinus Torvalds 22141da177e4SLinus Torvalds /* Verify stream values are non-zero. */ 22151da177e4SLinus Torvalds if ((0 == peer_init->init_hdr.num_outbound_streams) || 2216d023f629SVlad Yasevich (0 == peer_init->init_hdr.num_inbound_streams) || 2217d023f629SVlad Yasevich (0 == peer_init->init_hdr.init_tag) || 2218d023f629SVlad Yasevich (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) { 22191da177e4SLinus Torvalds 22207ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22211da177e4SLinus Torvalds } 22221da177e4SLinus Torvalds 22231da177e4SLinus Torvalds /* Check for missing mandatory parameters. */ 22241da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22251da177e4SLinus Torvalds 22261da177e4SLinus Torvalds if (SCTP_PARAM_STATE_COOKIE == param.p->type) 22271da177e4SLinus Torvalds has_cookie = 1; 22281da177e4SLinus Torvalds 22291da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22301da177e4SLinus Torvalds 22311da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22321da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22331da177e4SLinus Torvalds * The current param.p would point at the bad one. 22341da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22351da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22361da177e4SLinus Torvalds * error handling code build and send the packet. 22371da177e4SLinus Torvalds */ 22387ab90804SVlad Yasevich if (param.v != (void*)chunk->chunk_end) 22397ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22401da177e4SLinus Torvalds 22411da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22421da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22431da177e4SLinus Torvalds */ 22447ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22457ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22461da177e4SLinus Torvalds chunk, errp); 22471da177e4SLinus Torvalds 22487ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22491da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22501da177e4SLinus Torvalds 2251f53b5b09SEric W. Biederman result = sctp_verify_param(net, asoc, param, cid, chunk, errp); 22527ab90804SVlad Yasevich switch (result) { 22537ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22547ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22551da177e4SLinus Torvalds return 0; 22567ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 22571da177e4SLinus Torvalds return 1; 22587ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 22597ab90804SVlad Yasevich default: 22607ab90804SVlad Yasevich break; 22611da177e4SLinus Torvalds } 22621da177e4SLinus Torvalds 22631da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22641da177e4SLinus Torvalds 22651da177e4SLinus Torvalds return 1; 22661da177e4SLinus Torvalds } 22671da177e4SLinus Torvalds 22681da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 22691da177e4SLinus Torvalds * Returns 0 on failure, else success. 22701da177e4SLinus Torvalds * FIXME: This is an association method. 22711da177e4SLinus Torvalds */ 2272de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 22731da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2274dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 22751da177e4SLinus Torvalds { 2276e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 22771da177e4SLinus Torvalds union sctp_params param; 22781da177e4SLinus Torvalds struct sctp_transport *transport; 22791da177e4SLinus Torvalds struct list_head *pos, *temp; 2280de6becdcSWei Yongjun struct sctp_af *af; 2281de6becdcSWei Yongjun union sctp_addr addr; 22821da177e4SLinus Torvalds char *cookie; 2283de6becdcSWei Yongjun int src_match = 0; 22841da177e4SLinus Torvalds 22851da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 22861da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 22871da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 22881da177e4SLinus Torvalds * of the INIT from the cookie. 22891da177e4SLinus Torvalds */ 22901da177e4SLinus Torvalds 22911da177e4SLinus Torvalds /* This implementation defaults to making the first transport 22921da177e4SLinus Torvalds * added as the primary transport. The source address seems to 22931da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 22941da177e4SLinus Torvalds */ 22956a1e5f33SAl Viro if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 22961da177e4SLinus Torvalds goto nomem; 2297de6becdcSWei Yongjun 2298de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2299de6becdcSWei Yongjun src_match = 1; 23001da177e4SLinus Torvalds 23011da177e4SLinus Torvalds /* Process the initialization parameters. */ 23021da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2303de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2304de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2305de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2306de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2307de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2308de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2309de6becdcSWei Yongjun src_match = 1; 2310de6becdcSWei Yongjun } 23111da177e4SLinus Torvalds 23121da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23131da177e4SLinus Torvalds goto clean_up; 23141da177e4SLinus Torvalds } 23151da177e4SLinus Torvalds 2316de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2317de6becdcSWei Yongjun if (!src_match) 2318de6becdcSWei Yongjun goto clean_up; 2319de6becdcSWei Yongjun 2320730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2321730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2322730fc3d0SVlad Yasevich */ 2323730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2324730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2325730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2326730fc3d0SVlad Yasevich 2327d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2328d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2329d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2330d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2331d6701191SVlad Yasevich * is what we'll do here. 23326b2f9cb6SVlad Yasevich */ 2333e1fc3b14SEric W. Biederman if (!net->sctp.addip_noauth && 233473d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23356b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23366b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23376b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 233888799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2339d6701191SVlad Yasevich goto clean_up; 23406b2f9cb6SVlad Yasevich } 23416b2f9cb6SVlad Yasevich 23423f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23433f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23443f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23453f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23463f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23473f7a87d2SFrank Filz } 23483f7a87d2SFrank Filz } 23493f7a87d2SFrank Filz 23501da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23511da177e4SLinus Torvalds * order. 23521da177e4SLinus Torvalds */ 23531da177e4SLinus Torvalds asoc->peer.i.init_tag = 23541da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23551da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 23561da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 23571da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 23581da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23591da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 23601da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23611da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 23621da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 23631da177e4SLinus Torvalds 23641da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 23651da177e4SLinus Torvalds * number of inbound streams. 23661da177e4SLinus Torvalds */ 23671da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 23681da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 23691da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 23701da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23711da177e4SLinus Torvalds } 23721da177e4SLinus Torvalds 23731da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 23741da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 23751da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 23761da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23771da177e4SLinus Torvalds } 23781da177e4SLinus Torvalds 23791da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 23801da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 23811da177e4SLinus Torvalds 23821da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 23831da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 23841da177e4SLinus Torvalds 23851da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 23861da177e4SLinus Torvalds cookie = asoc->peer.cookie; 23871da177e4SLinus Torvalds if (cookie) { 2388af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 23891da177e4SLinus Torvalds if (!asoc->peer.cookie) 23901da177e4SLinus Torvalds goto clean_up; 23911da177e4SLinus Torvalds } 23921da177e4SLinus Torvalds 23931da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 23941da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 23951da177e4SLinus Torvalds * advertised window). 23961da177e4SLinus Torvalds */ 23979dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 23989dbc15f0SRobert P. J. Day transports) { 23991da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24001da177e4SLinus Torvalds } 24011da177e4SLinus Torvalds 24021da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24038e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24048e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24058e1ee18cSVlad Yasevich goto clean_up; 24061da177e4SLinus Torvalds 24071da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24081da177e4SLinus Torvalds * 24091da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24101da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24111da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24121da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24131da177e4SLinus Torvalds */ 24141da177e4SLinus Torvalds 24153f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 24163f7a87d2SFrank Filz * association. 24171da177e4SLinus Torvalds */ 24181da177e4SLinus Torvalds if (!asoc->temp) { 24191da177e4SLinus Torvalds int error; 24201da177e4SLinus Torvalds 24211da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 24221da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 24231da177e4SLinus Torvalds if (!asoc->ssnmap) 24241da177e4SLinus Torvalds goto clean_up; 24251da177e4SLinus Torvalds 242607d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 242707d93967SVlad Yasevich if (error) 24281da177e4SLinus Torvalds goto clean_up; 24291da177e4SLinus Torvalds } 24301da177e4SLinus Torvalds 24311da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24321da177e4SLinus Torvalds * 24331da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24341da177e4SLinus Torvalds * remote endpoint it should do the following: 24351da177e4SLinus Torvalds * ... 24361da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24371da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24381da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24391da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24401da177e4SLinus Torvalds */ 24411da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24421da177e4SLinus Torvalds return 1; 24431da177e4SLinus Torvalds 24441da177e4SLinus Torvalds clean_up: 24451da177e4SLinus Torvalds /* Release the transport structures. */ 24461da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24471da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2448add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2449add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24501da177e4SLinus Torvalds } 24513f7a87d2SFrank Filz 24521da177e4SLinus Torvalds nomem: 24531da177e4SLinus Torvalds return 0; 24541da177e4SLinus Torvalds } 24551da177e4SLinus Torvalds 24561da177e4SLinus Torvalds 24571da177e4SLinus Torvalds /* Update asoc with the option described in param. 24581da177e4SLinus Torvalds * 24591da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 24601da177e4SLinus Torvalds * 24611da177e4SLinus Torvalds * asoc is the association to update. 24621da177e4SLinus Torvalds * param is the variable length parameter to use for update. 24631da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 24641da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 24651da177e4SLinus Torvalds * work we do. In particular, we should not build transport 24661da177e4SLinus Torvalds * structures for the addresses. 24671da177e4SLinus Torvalds */ 24681da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 24691da177e4SLinus Torvalds union sctp_params param, 24701da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2471dd0fc66fSAl Viro gfp_t gfp) 24721da177e4SLinus Torvalds { 2473e7ff4a70SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 24741da177e4SLinus Torvalds union sctp_addr addr; 24751da177e4SLinus Torvalds int i; 24761da177e4SLinus Torvalds __u16 sat; 24771da177e4SLinus Torvalds int retval = 1; 24781da177e4SLinus Torvalds sctp_scope_t scope; 24791da177e4SLinus Torvalds time_t stale; 24801da177e4SLinus Torvalds struct sctp_af *af; 2481d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2482d6de3097SVlad Yasevich struct sctp_transport *t; 24831da177e4SLinus Torvalds 24841da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 24851da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 24861da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 24871da177e4SLinus Torvalds */ 24881da177e4SLinus Torvalds switch (param.p->type) { 24891da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 24901da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 24911da177e4SLinus Torvalds break; 24927dab83deSVlad Yasevich goto do_addr_param; 24937dab83deSVlad Yasevich 24941da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 24957dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 24967dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 24977dab83deSVlad Yasevich break; 24987dab83deSVlad Yasevich do_addr_param: 24991da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2500dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25011da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2502e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2503dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25041da177e4SLinus Torvalds return 0; 25051da177e4SLinus Torvalds break; 25061da177e4SLinus Torvalds 25071da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2508e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25091da177e4SLinus Torvalds break; 25101da177e4SLinus Torvalds 25111da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25121da177e4SLinus Torvalds 25131da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25141da177e4SLinus Torvalds * (1/1000sec). 25151da177e4SLinus Torvalds */ 25161da177e4SLinus Torvalds asoc->cookie_life.tv_sec += stale / 1000; 25171da177e4SLinus Torvalds asoc->cookie_life.tv_usec += (stale % 1000) * 1000; 25181da177e4SLinus Torvalds break; 25191da177e4SLinus Torvalds 25201da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25211da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n"); 25221da177e4SLinus Torvalds break; 25231da177e4SLinus Torvalds 25241da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25251da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25261da177e4SLinus Torvalds * ones are really set by the peer. 25271da177e4SLinus Torvalds */ 25281da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25291da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25301da177e4SLinus Torvalds 2531140ee960SGui Jianfeng /* Assume that peer supports the address family 2532140ee960SGui Jianfeng * by which it sends a packet. 2533140ee960SGui Jianfeng */ 2534140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2535140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2536140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2537140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2538140ee960SGui Jianfeng 25391da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25401da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25411da177e4SLinus Torvalds if (sat) 25421da177e4SLinus Torvalds sat /= sizeof(__u16); 25431da177e4SLinus Torvalds 25441da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25451da177e4SLinus Torvalds switch (param.sat->types[i]) { 25461da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25471da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25481da177e4SLinus Torvalds break; 25491da177e4SLinus Torvalds 25501da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25516e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25521da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25531da177e4SLinus Torvalds break; 25541da177e4SLinus Torvalds 25551da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25561da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25571da177e4SLinus Torvalds break; 25581da177e4SLinus Torvalds 25591da177e4SLinus Torvalds default: /* Just ignore anything else. */ 25601da177e4SLinus Torvalds break; 25613ff50b79SStephen Hemminger } 25621da177e4SLinus Torvalds } 25631da177e4SLinus Torvalds break; 25641da177e4SLinus Torvalds 25651da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 25661da177e4SLinus Torvalds asoc->peer.cookie_len = 25671da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25681da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 25691da177e4SLinus Torvalds break; 25701da177e4SLinus Torvalds 25711da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 25721da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 25731da177e4SLinus Torvalds break; 25741da177e4SLinus Torvalds 25751da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 25761da177e4SLinus Torvalds /* Rejected during verify stage. */ 25771da177e4SLinus Torvalds break; 25781da177e4SLinus Torvalds 25791da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 25801da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 25811da177e4SLinus Torvalds break; 25821da177e4SLinus Torvalds 25830f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2584e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 25851da177e4SLinus Torvalds break; 25861da177e4SLinus Torvalds 2587d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2588e1fc3b14SEric W. Biederman if (!net->sctp.addip_enable) 25890ef46e28SVlad Yasevich goto fall_through; 25900ef46e28SVlad Yasevich 2591d6de3097SVlad Yasevich addr_param = param.v + sizeof(sctp_addip_param_t); 2592d6de3097SVlad Yasevich 2593d6de3097SVlad Yasevich af = sctp_get_af_specific(param_type2af(param.p->type)); 2594d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2595d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2596d6de3097SVlad Yasevich 2597d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2598d6de3097SVlad Yasevich * XXX: see spec for what to do. 2599d6de3097SVlad Yasevich */ 2600d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2601d6de3097SVlad Yasevich break; 2602d6de3097SVlad Yasevich 2603d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2604d6de3097SVlad Yasevich if (!t) 2605d6de3097SVlad Yasevich break; 2606d6de3097SVlad Yasevich 2607d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2608d6de3097SVlad Yasevich break; 2609d6de3097SVlad Yasevich 2610131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2611131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2612131a47e3SVlad Yasevich break; 2613131a47e3SVlad Yasevich 26141da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 2615e1fc3b14SEric W. Biederman if (net->sctp.prsctp_enable) { 26161da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26171da177e4SLinus Torvalds break; 26181da177e4SLinus Torvalds } 26191da177e4SLinus Torvalds /* Fall Through */ 2620730fc3d0SVlad Yasevich goto fall_through; 2621730fc3d0SVlad Yasevich 2622730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2623e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2624730fc3d0SVlad Yasevich goto fall_through; 2625730fc3d0SVlad Yasevich 2626730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2627730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2628730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2629730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2630730fc3d0SVlad Yasevich retval = 0; 2631730fc3d0SVlad Yasevich break; 2632730fc3d0SVlad Yasevich } 2633730fc3d0SVlad Yasevich break; 2634730fc3d0SVlad Yasevich 2635730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2636e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2637730fc3d0SVlad Yasevich goto fall_through; 2638730fc3d0SVlad Yasevich 2639730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2640730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2641730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2642730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2643730fc3d0SVlad Yasevich retval = 0; 2644730fc3d0SVlad Yasevich break; 2645730fc3d0SVlad Yasevich } 2646730fc3d0SVlad Yasevich 2647730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2648730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2649730fc3d0SVlad Yasevich break; 2650730fc3d0SVlad Yasevich 2651730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2652e1fc3b14SEric W. Biederman if (!net->sctp.auth_enable) 2653730fc3d0SVlad Yasevich goto fall_through; 2654730fc3d0SVlad Yasevich 2655730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2656730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2657730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2658730fc3d0SVlad Yasevich retval = 0; 2659730fc3d0SVlad Yasevich break; 2660730fc3d0SVlad Yasevich fall_through: 26611da177e4SLinus Torvalds default: 26621da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 26631da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 26641da177e4SLinus Torvalds * called prior to this routine. Simply log the error 26651da177e4SLinus Torvalds * here. 26661da177e4SLinus Torvalds */ 26671da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n", 26681da177e4SLinus Torvalds ntohs(param.p->type), asoc); 26691da177e4SLinus Torvalds break; 26703ff50b79SStephen Hemminger } 26711da177e4SLinus Torvalds 26721da177e4SLinus Torvalds return retval; 26731da177e4SLinus Torvalds } 26741da177e4SLinus Torvalds 26751da177e4SLinus Torvalds /* Select a new verification tag. */ 26761da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 26771da177e4SLinus Torvalds { 26781da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 26791da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 26801da177e4SLinus Torvalds */ 26811da177e4SLinus Torvalds __u32 x; 26821da177e4SLinus Torvalds 26831da177e4SLinus Torvalds do { 26841da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 26851da177e4SLinus Torvalds } while (x == 0); 26861da177e4SLinus Torvalds 26871da177e4SLinus Torvalds return x; 26881da177e4SLinus Torvalds } 26891da177e4SLinus Torvalds 26901da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 26911da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 26921da177e4SLinus Torvalds { 26931da177e4SLinus Torvalds __u32 retval; 26941da177e4SLinus Torvalds 26951da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 26961da177e4SLinus Torvalds return retval; 26971da177e4SLinus Torvalds } 26981da177e4SLinus Torvalds 26991da177e4SLinus Torvalds /* 27001da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27011da177e4SLinus Torvalds * 0 1 2 3 27021da177e4SLinus 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 27031da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27041da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27051da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27061da177e4SLinus Torvalds * | Serial Number | 27071da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27081da177e4SLinus Torvalds * | Address Parameter | 27091da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27101da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27111da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27121da177e4SLinus Torvalds * \ \ 27131da177e4SLinus Torvalds * / .... / 27141da177e4SLinus Torvalds * \ \ 27151da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27161da177e4SLinus Torvalds * | ASCONF Parameter #N | 27171da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27181da177e4SLinus Torvalds * 27191da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27201da177e4SLinus Torvalds */ 27211da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27221da177e4SLinus Torvalds union sctp_addr *addr, 27231da177e4SLinus Torvalds int vparam_len) 27241da177e4SLinus Torvalds { 27251da177e4SLinus Torvalds sctp_addiphdr_t asconf; 27261da177e4SLinus Torvalds struct sctp_chunk *retval; 27271da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27281da177e4SLinus Torvalds union sctp_addr_param addrparam; 27291da177e4SLinus Torvalds int addrlen; 27301da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27311da177e4SLinus Torvalds 27321da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27331da177e4SLinus Torvalds if (!addrlen) 27341da177e4SLinus Torvalds return NULL; 27351da177e4SLinus Torvalds length += addrlen; 27361da177e4SLinus Torvalds 27371da177e4SLinus Torvalds /* Create the chunk. */ 27381da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length); 27391da177e4SLinus Torvalds if (!retval) 27401da177e4SLinus Torvalds return NULL; 27411da177e4SLinus Torvalds 27421da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27431da177e4SLinus Torvalds 27441da177e4SLinus Torvalds retval->subh.addip_hdr = 27451da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27461da177e4SLinus Torvalds retval->param_hdr.v = 27471da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27481da177e4SLinus Torvalds 27491da177e4SLinus Torvalds return retval; 27501da177e4SLinus Torvalds } 27511da177e4SLinus Torvalds 27521da177e4SLinus Torvalds /* ADDIP 27531da177e4SLinus Torvalds * 3.2.1 Add IP Address 27541da177e4SLinus Torvalds * 0 1 2 3 27551da177e4SLinus 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 27561da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27571da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 27581da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27591da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27601da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27611da177e4SLinus Torvalds * | Address Parameter | 27621da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27631da177e4SLinus Torvalds * 27641da177e4SLinus Torvalds * 3.2.2 Delete IP Address 27651da177e4SLinus Torvalds * 0 1 2 3 27661da177e4SLinus 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 27671da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27681da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 27691da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27701da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27711da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27721da177e4SLinus Torvalds * | Address Parameter | 27731da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27741da177e4SLinus Torvalds * 27751da177e4SLinus Torvalds */ 27761da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 27771da177e4SLinus Torvalds union sctp_addr *laddr, 27781da177e4SLinus Torvalds struct sockaddr *addrs, 27791da177e4SLinus Torvalds int addrcnt, 2780dbc16db1SAl Viro __be16 flags) 27811da177e4SLinus Torvalds { 27821da177e4SLinus Torvalds sctp_addip_param_t param; 27831da177e4SLinus Torvalds struct sctp_chunk *retval; 27841da177e4SLinus Torvalds union sctp_addr_param addr_param; 27851da177e4SLinus Torvalds union sctp_addr *addr; 27861da177e4SLinus Torvalds void *addr_buf; 27871da177e4SLinus Torvalds struct sctp_af *af; 27881da177e4SLinus Torvalds int paramlen = sizeof(param); 27891da177e4SLinus Torvalds int addr_param_len = 0; 27901da177e4SLinus Torvalds int totallen = 0; 27911da177e4SLinus Torvalds int i; 27928a07eb0aSMichio Honda int del_pickup = 0; 27931da177e4SLinus Torvalds 27941da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 27951da177e4SLinus Torvalds addr_buf = addrs; 27961da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2797ea110733SJoe Perches addr = addr_buf; 27981da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 27991da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28001da177e4SLinus Torvalds 28011da177e4SLinus Torvalds totallen += paramlen; 28021da177e4SLinus Torvalds totallen += addr_param_len; 28031da177e4SLinus Torvalds 28041da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28058a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28068a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28078a07eb0aSMichio Honda totallen += paramlen; 28088a07eb0aSMichio Honda totallen += addr_param_len; 28098a07eb0aSMichio Honda del_pickup = 1; 28108a07eb0aSMichio Honda SCTP_DEBUG_PRINTK("mkasconf_update_ip: picked same-scope del_pending addr, totallen for all addresses is %d\n", totallen); 28118a07eb0aSMichio Honda } 28121da177e4SLinus Torvalds } 28131da177e4SLinus Torvalds 28141da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28151da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28161da177e4SLinus Torvalds if (!retval) 28171da177e4SLinus Torvalds return NULL; 28181da177e4SLinus Torvalds 28191da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28201da177e4SLinus Torvalds addr_buf = addrs; 28211da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2822ea110733SJoe Perches addr = addr_buf; 28231da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28241da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28251da177e4SLinus Torvalds param.param_hdr.type = flags; 28261da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 28271da177e4SLinus Torvalds param.crr_id = i; 28281da177e4SLinus Torvalds 28291da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28301da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28311da177e4SLinus Torvalds 28321da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28331da177e4SLinus Torvalds } 28348a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28358a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28368a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28378a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28388a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28398a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 28408a07eb0aSMichio Honda param.crr_id = i; 28418a07eb0aSMichio Honda 28428a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28438a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28448a07eb0aSMichio Honda } 28451da177e4SLinus Torvalds return retval; 28461da177e4SLinus Torvalds } 28471da177e4SLinus Torvalds 28481da177e4SLinus Torvalds /* ADDIP 28491da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 28501da177e4SLinus Torvalds * 0 1 2 3 28511da177e4SLinus 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 28521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28531da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 28541da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28551da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28561da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28571da177e4SLinus Torvalds * | Address Parameter | 28581da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28591da177e4SLinus Torvalds * 28601da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 28611da177e4SLinus Torvalds */ 28621da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 28631da177e4SLinus Torvalds union sctp_addr *addr) 28641da177e4SLinus Torvalds { 28651da177e4SLinus Torvalds sctp_addip_param_t param; 28661da177e4SLinus Torvalds struct sctp_chunk *retval; 28671da177e4SLinus Torvalds int len = sizeof(param); 28681da177e4SLinus Torvalds union sctp_addr_param addrparam; 28691da177e4SLinus Torvalds int addrlen; 28701da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 28711da177e4SLinus Torvalds 28721da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 28731da177e4SLinus Torvalds if (!addrlen) 28741da177e4SLinus Torvalds return NULL; 28751da177e4SLinus Torvalds len += addrlen; 28761da177e4SLinus Torvalds 28771da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 28781da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 28791da177e4SLinus Torvalds if (!retval) 28801da177e4SLinus Torvalds return NULL; 28811da177e4SLinus Torvalds 28821da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 28831da177e4SLinus Torvalds param.param_hdr.length = htons(len); 28841da177e4SLinus Torvalds param.crr_id = 0; 28851da177e4SLinus Torvalds 28861da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 28871da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 28881da177e4SLinus Torvalds 28891da177e4SLinus Torvalds return retval; 28901da177e4SLinus Torvalds } 28911da177e4SLinus Torvalds 28921da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 28931da177e4SLinus Torvalds * 0 1 2 3 28941da177e4SLinus 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 28951da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28961da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 28971da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28981da177e4SLinus Torvalds * | Serial Number | 28991da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29001da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29011da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29021da177e4SLinus Torvalds * \ \ 29031da177e4SLinus Torvalds * / .... / 29041da177e4SLinus Torvalds * \ \ 29051da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29061da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29071da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29081da177e4SLinus Torvalds * 29091da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29101da177e4SLinus Torvalds */ 29111da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29121da177e4SLinus Torvalds __u32 serial, int vparam_len) 29131da177e4SLinus Torvalds { 29141da177e4SLinus Torvalds sctp_addiphdr_t asconf; 29151da177e4SLinus Torvalds struct sctp_chunk *retval; 29161da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29171da177e4SLinus Torvalds 29181da177e4SLinus Torvalds /* Create the chunk. */ 29191da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length); 29201da177e4SLinus Torvalds if (!retval) 29211da177e4SLinus Torvalds return NULL; 29221da177e4SLinus Torvalds 29231da177e4SLinus Torvalds asconf.serial = htonl(serial); 29241da177e4SLinus Torvalds 29251da177e4SLinus Torvalds retval->subh.addip_hdr = 29261da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29271da177e4SLinus Torvalds 29281da177e4SLinus Torvalds return retval; 29291da177e4SLinus Torvalds } 29301da177e4SLinus Torvalds 29311da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29329f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2933dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 29341da177e4SLinus Torvalds { 29351da177e4SLinus Torvalds sctp_addip_param_t ack_param; 29361da177e4SLinus Torvalds sctp_errhdr_t err_param; 29371da177e4SLinus Torvalds int asconf_param_len = 0; 29381da177e4SLinus Torvalds int err_param_len = 0; 2939dbc16db1SAl Viro __be16 response_type; 29401da177e4SLinus Torvalds 29411da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 29421da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 29431da177e4SLinus Torvalds } else { 29441da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 29451da177e4SLinus Torvalds err_param_len = sizeof(err_param); 29461da177e4SLinus Torvalds if (asconf_param) 29471da177e4SLinus Torvalds asconf_param_len = 29481da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 29491da177e4SLinus Torvalds } 29501da177e4SLinus Torvalds 29511da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 29521da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 29531da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 29541da177e4SLinus Torvalds err_param_len + 29551da177e4SLinus Torvalds asconf_param_len); 29561da177e4SLinus Torvalds ack_param.crr_id = crr_id; 29571da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 29581da177e4SLinus Torvalds 29591da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 29601da177e4SLinus Torvalds return; 29611da177e4SLinus Torvalds 29621da177e4SLinus Torvalds /* Add Error Cause parameter. */ 29631da177e4SLinus Torvalds err_param.cause = err_code; 29641da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 29651da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 29661da177e4SLinus Torvalds 29671da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 29681da177e4SLinus Torvalds if (asconf_param) 29691da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 29701da177e4SLinus Torvalds } 29711da177e4SLinus Torvalds 29721da177e4SLinus Torvalds /* Process a asconf parameter. */ 2973dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 29741da177e4SLinus Torvalds struct sctp_chunk *asconf, 29751da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 29761da177e4SLinus Torvalds { 29771da177e4SLinus Torvalds struct sctp_transport *peer; 29781da177e4SLinus Torvalds struct sctp_af *af; 29791da177e4SLinus Torvalds union sctp_addr addr; 29801da177e4SLinus Torvalds union sctp_addr_param *addr_param; 29811da177e4SLinus Torvalds 2982ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 2983c1cc678aSPatrick McHardy 298444e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 298544e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 298644e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 298744e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 298844e65c1eSWei Yongjun 29896a435732SShan Wei switch (addr_param->p.type) { 2990c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 2991c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 2992945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 2993c4492586SWei Yongjun break; 2994c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 2995c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 2996945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 2997c4492586SWei Yongjun break; 2998c4492586SWei Yongjun default: 2999945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3000c4492586SWei Yongjun } 3001c4492586SWei Yongjun 30026a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30031da177e4SLinus Torvalds if (unlikely(!af)) 3004945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30051da177e4SLinus Torvalds 3006dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 300742e30bf3SVlad Yasevich 300842e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 300942e30bf3SVlad Yasevich * or multicast address. 301042e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 301142e30bf3SVlad Yasevich * make sure we check for that) 301242e30bf3SVlad Yasevich */ 301342e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3014945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 301542e30bf3SVlad Yasevich 30161da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30171da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 301842e30bf3SVlad Yasevich /* Section 4.2.1: 301942e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 302042e30bf3SVlad Yasevich * address of the packet MUST be added. 302142e30bf3SVlad Yasevich */ 302242e30bf3SVlad Yasevich if (af->is_any(&addr)) 302342e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 302442e30bf3SVlad Yasevich 30251da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30261da177e4SLinus Torvalds * request and does not have the local resources to add this 30271da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30281da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30291da177e4SLinus Torvalds * Due to Resource Shortage'. 30301da177e4SLinus Torvalds */ 30311da177e4SLinus Torvalds 3032dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30331da177e4SLinus Torvalds if (!peer) 30341da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30351da177e4SLinus Torvalds 30361da177e4SLinus Torvalds /* Start the heartbeat timer. */ 30371da177e4SLinus Torvalds if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) 30381da177e4SLinus Torvalds sctp_transport_hold(peer); 30396af29cccSMichio Honda asoc->new_transport = peer; 30401da177e4SLinus Torvalds break; 30411da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30421da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30431da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30441da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30451da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 30461da177e4SLinus Torvalds */ 304742e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 30481da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 30491da177e4SLinus Torvalds 30501da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 30511da177e4SLinus Torvalds * address which is also the source address of the IP packet 30521da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 30531da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 30541da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 30551da177e4SLinus Torvalds * Delete Source IP Address' 30561da177e4SLinus Torvalds */ 3057b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 30581da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 30591da177e4SLinus Torvalds 306042e30bf3SVlad Yasevich /* Section 4.2.2 306142e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 306242e30bf3SVlad Yasevich * addresses of the peer except the source address of the 306342e30bf3SVlad Yasevich * packet MUST be deleted. 306442e30bf3SVlad Yasevich */ 306542e30bf3SVlad Yasevich if (af->is_any(&addr)) { 306642e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 306742e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 306842e30bf3SVlad Yasevich asconf->transport); 306942e30bf3SVlad Yasevich } else 3070dd86d136SAl Viro sctp_assoc_del_peer(asoc, &addr); 30711da177e4SLinus Torvalds break; 30721da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 307342e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 307442e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 307542e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 307642e30bf3SVlad Yasevich * primary. 307742e30bf3SVlad Yasevich */ 307842e30bf3SVlad Yasevich if (af->is_any(&addr)) 307942e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 308042e30bf3SVlad Yasevich 3081dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 30821da177e4SLinus Torvalds if (!peer) 3083945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30841da177e4SLinus Torvalds 30851da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 30861da177e4SLinus Torvalds break; 30871da177e4SLinus Torvalds } 30881da177e4SLinus Torvalds 30891da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 30901da177e4SLinus Torvalds } 30911da177e4SLinus Torvalds 30926f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 30936f4c618dSWei Yongjun int sctp_verify_asconf(const struct sctp_association *asoc, 30946f4c618dSWei Yongjun struct sctp_paramhdr *param_hdr, void *chunk_end, 30956f4c618dSWei Yongjun struct sctp_paramhdr **errp) { 30966f4c618dSWei Yongjun sctp_addip_param_t *asconf_param; 30976f4c618dSWei Yongjun union sctp_params param; 30986f4c618dSWei Yongjun int length, plen; 30996f4c618dSWei Yongjun 31006f4c618dSWei Yongjun param.v = (sctp_paramhdr_t *) param_hdr; 31016f4c618dSWei Yongjun while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) { 31026f4c618dSWei Yongjun length = ntohs(param.p->length); 31036f4c618dSWei Yongjun *errp = param.p; 31046f4c618dSWei Yongjun 31056f4c618dSWei Yongjun if (param.v > chunk_end - length || 31066f4c618dSWei Yongjun length < sizeof(sctp_paramhdr_t)) 31076f4c618dSWei Yongjun return 0; 31086f4c618dSWei Yongjun 31096f4c618dSWei Yongjun switch (param.p->type) { 31106f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31116f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31126f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31136f4c618dSWei Yongjun asconf_param = (sctp_addip_param_t *)param.v; 31146f4c618dSWei Yongjun plen = ntohs(asconf_param->param_hdr.length); 31156f4c618dSWei Yongjun if (plen < sizeof(sctp_addip_param_t) + 31166f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 31176f4c618dSWei Yongjun return 0; 31186f4c618dSWei Yongjun break; 31196f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 31206f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 31216f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 31226f4c618dSWei Yongjun return 0; 31236f4c618dSWei Yongjun 31246f4c618dSWei Yongjun break; 31256f4c618dSWei Yongjun default: 31266f4c618dSWei Yongjun break; 31276f4c618dSWei Yongjun } 31286f4c618dSWei Yongjun 31296f4c618dSWei Yongjun param.v += WORD_ROUND(length); 31306f4c618dSWei Yongjun } 31316f4c618dSWei Yongjun 31326f4c618dSWei Yongjun if (param.v != chunk_end) 31336f4c618dSWei Yongjun return 0; 31346f4c618dSWei Yongjun 31356f4c618dSWei Yongjun return 1; 31366f4c618dSWei Yongjun } 31376f4c618dSWei Yongjun 31381da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 31391da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 31401da177e4SLinus Torvalds */ 31411da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 31421da177e4SLinus Torvalds struct sctp_chunk *asconf) 31431da177e4SLinus Torvalds { 31441da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 31451da177e4SLinus Torvalds union sctp_addr_param *addr_param; 31461da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 31471da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 31481da177e4SLinus Torvalds 3149dbc16db1SAl Viro __be16 err_code; 31501da177e4SLinus Torvalds int length = 0; 3151f3830cccSWei Yongjun int chunk_len; 31521da177e4SLinus Torvalds __u32 serial; 31531da177e4SLinus Torvalds int all_param_pass = 1; 31541da177e4SLinus Torvalds 3155f3830cccSWei Yongjun chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); 31561da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 31571da177e4SLinus Torvalds serial = ntohl(hdr->serial); 31581da177e4SLinus Torvalds 31591da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 31601da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 31611da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 31621da177e4SLinus Torvalds chunk_len -= length; 31631da177e4SLinus Torvalds 31641da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 31657aa1b54bSJoe Perches * asconf parameter. 31661da177e4SLinus Torvalds */ 31676a435732SShan Wei length = ntohs(addr_param->p.length); 3168ea110733SJoe Perches asconf_param = (void *)addr_param + length; 31691da177e4SLinus Torvalds chunk_len -= length; 31701da177e4SLinus Torvalds 31711da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 31721da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 31732cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 31747aa1b54bSJoe Perches * parameters. 31751da177e4SLinus Torvalds */ 31762cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 31771da177e4SLinus Torvalds if (!asconf_ack) 31781da177e4SLinus Torvalds goto done; 31791da177e4SLinus Torvalds 31801da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 31811da177e4SLinus Torvalds while (chunk_len > 0) { 31821da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 31831da177e4SLinus Torvalds asconf_param); 31841da177e4SLinus Torvalds /* ADDIP 4.1 A7) 31851da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 31861da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 31871da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 31881da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 31891da177e4SLinus Torvalds * a specific success indication is present for the parameter. 31901da177e4SLinus Torvalds */ 31911da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR != err_code) 31921da177e4SLinus Torvalds all_param_pass = 0; 31931da177e4SLinus Torvalds 31941da177e4SLinus Torvalds if (!all_param_pass) 31951da177e4SLinus Torvalds sctp_add_asconf_response(asconf_ack, 31961da177e4SLinus Torvalds asconf_param->crr_id, err_code, 31971da177e4SLinus Torvalds asconf_param); 31981da177e4SLinus Torvalds 31991da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32001da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32011da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32021da177e4SLinus Torvalds * in the ASCONF. 32031da177e4SLinus Torvalds */ 32041da177e4SLinus Torvalds if (SCTP_ERROR_RSRC_LOW == err_code) 32051da177e4SLinus Torvalds goto done; 32061da177e4SLinus Torvalds 32071da177e4SLinus Torvalds /* Move to the next ASCONF param. */ 32081da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3209ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 32101da177e4SLinus Torvalds chunk_len -= length; 32111da177e4SLinus Torvalds } 32121da177e4SLinus Torvalds 32131da177e4SLinus Torvalds done: 32141da177e4SLinus Torvalds asoc->peer.addip_serial++; 32151da177e4SLinus Torvalds 32161da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 32171da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 32181da177e4SLinus Torvalds */ 32191da177e4SLinus Torvalds if (asconf_ack) { 32201da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3221a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3222a08de64dSVlad Yasevich &asoc->asconf_ack_list); 32231da177e4SLinus Torvalds } 32241da177e4SLinus Torvalds 32251da177e4SLinus Torvalds return asconf_ack; 32261da177e4SLinus Torvalds } 32271da177e4SLinus Torvalds 32281da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3229425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 32301da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 32311da177e4SLinus Torvalds { 32321da177e4SLinus Torvalds struct sctp_af *af; 32331da177e4SLinus Torvalds union sctp_addr addr; 32341da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 32351da177e4SLinus Torvalds union sctp_addr_param *addr_param; 32361da177e4SLinus Torvalds struct sctp_transport *transport; 3237dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 32381da177e4SLinus Torvalds 3239ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 32401da177e4SLinus Torvalds 32411da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 32426a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3243dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 32441da177e4SLinus Torvalds 32451da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 32461da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3247559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3248559cf710SVlad Yasevich * held, so the list can not change. 3249559cf710SVlad Yasevich */ 32500ed90fb0SVlad Yasevich local_bh_disable(); 3251559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3252dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3253f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3254dc022a98SSridhar Samudrala } 32550ed90fb0SVlad Yasevich local_bh_enable(); 32563cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 32573cd9749cSWei Yongjun transports) { 32583cd9749cSWei Yongjun dst_release(transport->dst); 3259c6ef006bSVlad Yasevich transport->dst = NULL; 32603cd9749cSWei Yongjun } 32611da177e4SLinus Torvalds break; 32621da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 32630ed90fb0SVlad Yasevich local_bh_disable(); 3264425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 32658a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 32668a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 32678a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 32688a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 32698a07eb0aSMichio Honda } 32700ed90fb0SVlad Yasevich local_bh_enable(); 32719dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 32729dbc15f0SRobert P. J. Day transports) { 3273dc022a98SSridhar Samudrala dst_release(transport->dst); 3274c6ef006bSVlad Yasevich transport->dst = NULL; 32751da177e4SLinus Torvalds } 32761da177e4SLinus Torvalds break; 32771da177e4SLinus Torvalds default: 32781da177e4SLinus Torvalds break; 32791da177e4SLinus Torvalds } 32801da177e4SLinus Torvalds } 32811da177e4SLinus Torvalds 32821da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 32831da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 32841da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 32851da177e4SLinus Torvalds * ADDIP 4.1 32861da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 32871da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 32881da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 32891da177e4SLinus Torvalds * specific success indication is present for the parameter. 32901da177e4SLinus Torvalds */ 3291dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 32921da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 32931da177e4SLinus Torvalds int no_err) 32941da177e4SLinus Torvalds { 32951da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 32961da177e4SLinus Torvalds sctp_errhdr_t *err_param; 32971da177e4SLinus Torvalds int length; 3298f3830cccSWei Yongjun int asconf_ack_len; 3299dbc16db1SAl Viro __be16 err_code; 33001da177e4SLinus Torvalds 33011da177e4SLinus Torvalds if (no_err) 33021da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33031da177e4SLinus Torvalds else 33041da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33051da177e4SLinus Torvalds 3306f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3307f3830cccSWei Yongjun sizeof(sctp_chunkhdr_t); 3308f3830cccSWei Yongjun 33091da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33101da177e4SLinus Torvalds * the first asconf_ack parameter. 33111da177e4SLinus Torvalds */ 33121da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 33131da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 33141da177e4SLinus Torvalds length); 33151da177e4SLinus Torvalds asconf_ack_len -= length; 33161da177e4SLinus Torvalds 33171da177e4SLinus Torvalds while (asconf_ack_len > 0) { 33181da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 33191da177e4SLinus Torvalds switch(asconf_ack_param->param_hdr.type) { 33201da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 33211da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 33221da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 33231da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 3324ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 33251da177e4SLinus Torvalds asconf_ack_len -= length; 33261da177e4SLinus Torvalds if (asconf_ack_len > 0) 33271da177e4SLinus Torvalds return err_param->cause; 33281da177e4SLinus Torvalds else 33291da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33301da177e4SLinus Torvalds break; 33311da177e4SLinus Torvalds default: 33321da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33331da177e4SLinus Torvalds } 33341da177e4SLinus Torvalds } 33351da177e4SLinus Torvalds 33361da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3337ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 33381da177e4SLinus Torvalds asconf_ack_len -= length; 33391da177e4SLinus Torvalds } 33401da177e4SLinus Torvalds 33411da177e4SLinus Torvalds return err_code; 33421da177e4SLinus Torvalds } 33431da177e4SLinus Torvalds 33441da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 33451da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 33461da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 33471da177e4SLinus Torvalds { 33481da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 33491da177e4SLinus Torvalds union sctp_addr_param *addr_param; 33501da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 33511da177e4SLinus Torvalds int length = 0; 33521da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 33531da177e4SLinus Torvalds int all_param_pass = 0; 33541da177e4SLinus Torvalds int no_err = 1; 33551da177e4SLinus Torvalds int retval = 0; 3356dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 33571da177e4SLinus Torvalds 33581da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 33591da177e4SLinus Torvalds * a pointer to address parameter. 33601da177e4SLinus Torvalds */ 33611da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 33621da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 33631da177e4SLinus Torvalds asconf_len -= length; 33641da177e4SLinus Torvalds 33651da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 33667aa1b54bSJoe Perches * pointer to the first asconf parameter. 33671da177e4SLinus Torvalds */ 33686a435732SShan Wei length = ntohs(addr_param->p.length); 3369ea110733SJoe Perches asconf_param = (void *)addr_param + length; 33701da177e4SLinus Torvalds asconf_len -= length; 33711da177e4SLinus Torvalds 33721da177e4SLinus Torvalds /* ADDIP 4.1 33731da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 33741da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 33751da177e4SLinus Torvalds * successful. 33761da177e4SLinus Torvalds */ 33771da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 33781da177e4SLinus Torvalds all_param_pass = 1; 33791da177e4SLinus Torvalds 33801da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 33811da177e4SLinus Torvalds while (asconf_len > 0) { 33821da177e4SLinus Torvalds if (all_param_pass) 33831da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33841da177e4SLinus Torvalds else { 33851da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 33861da177e4SLinus Torvalds asconf_param, 33871da177e4SLinus Torvalds no_err); 33881da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 33891da177e4SLinus Torvalds no_err = 0; 33901da177e4SLinus Torvalds } 33911da177e4SLinus Torvalds 33921da177e4SLinus Torvalds switch (err_code) { 33931da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3394425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 33951da177e4SLinus Torvalds break; 33961da177e4SLinus Torvalds 33971da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 33981da177e4SLinus Torvalds retval = 1; 33991da177e4SLinus Torvalds break; 34001da177e4SLinus Torvalds 3401a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34021da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34031da177e4SLinus Torvalds * future. 34041da177e4SLinus Torvalds */ 34051da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34061da177e4SLinus Torvalds asconf_param->param_hdr.type; 34071da177e4SLinus Torvalds break; 34081da177e4SLinus Torvalds 34091da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34101da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34111da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34121da177e4SLinus Torvalds default: 34131da177e4SLinus Torvalds break; 34141da177e4SLinus Torvalds } 34151da177e4SLinus Torvalds 34161da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 34171da177e4SLinus Torvalds * one. 34181da177e4SLinus Torvalds */ 34191da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3420ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 34211da177e4SLinus Torvalds asconf_len -= length; 34221da177e4SLinus Torvalds } 34231da177e4SLinus Torvalds 3424ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 34258a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3426ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3427ddc4bbeeSMichio Honda } 34288a07eb0aSMichio Honda 34291da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 34305f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 34311da177e4SLinus Torvalds sctp_chunk_free(asconf); 34321da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 34331da177e4SLinus Torvalds 34341da177e4SLinus Torvalds return retval; 34351da177e4SLinus Torvalds } 34361da177e4SLinus Torvalds 34371da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 34381da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 34391da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 34401da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 34411da177e4SLinus Torvalds { 34421da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 34431da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 34441da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 34451da177e4SLinus Torvalds size_t hint; 34461da177e4SLinus Torvalds int i; 34471da177e4SLinus Torvalds 34481da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 34491da177e4SLinus Torvalds 34501da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint); 34511da177e4SLinus Torvalds 34521da177e4SLinus Torvalds if (!retval) 34531da177e4SLinus Torvalds return NULL; 34541da177e4SLinus Torvalds 34551da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 34561da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 34571da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 34581da177e4SLinus Torvalds 34591da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 34601da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 34611da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 34621da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 34631da177e4SLinus Torvalds } 34641da177e4SLinus Torvalds 34651da177e4SLinus Torvalds return retval; 34661da177e4SLinus Torvalds } 3467