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 531da177e4SLinus Torvalds #include <linux/types.h> 541da177e4SLinus Torvalds #include <linux/kernel.h> 551da177e4SLinus Torvalds #include <linux/ip.h> 561da177e4SLinus Torvalds #include <linux/ipv6.h> 571da177e4SLinus Torvalds #include <linux/net.h> 581da177e4SLinus Torvalds #include <linux/inet.h> 59ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 601da177e4SLinus Torvalds #include <linux/crypto.h> 611da177e4SLinus Torvalds #include <net/sock.h> 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds #include <linux/skbuff.h> 641da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 651da177e4SLinus Torvalds #include <net/sctp/sctp.h> 661da177e4SLinus Torvalds #include <net/sctp/sm.h> 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds SCTP_STATIC 691da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 701da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen); 711da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 721da177e4SLinus Torvalds const struct sctp_association *asoc, 731da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 741da177e4SLinus Torvalds int *cookie_len, 751da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 761da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 771da177e4SLinus Torvalds union sctp_params param, 781da177e4SLinus Torvalds const union sctp_addr *peer_addr, 79dd0fc66fSAl Viro gfp_t gfp); 808ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 818ee4be37SVlad Yasevich const void *data); 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 841da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 851da177e4SLinus Torvalds { 861da177e4SLinus Torvalds struct sctp_af *af; 871da177e4SLinus Torvalds int iif = 0; 881da177e4SLinus Torvalds 89eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version)); 901da177e4SLinus Torvalds if (af) 911da177e4SLinus Torvalds iif = af->skb_iif(chunk->skb); 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds return iif; 941da177e4SLinus Torvalds } 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 971da177e4SLinus Torvalds * 981da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 991da177e4SLinus Torvalds * Explicit Congestion Notification. 1001da177e4SLinus Torvalds */ 1011da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1021da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 10309640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1041da177e4SLinus Torvalds }; 1051da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1061da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 10709640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1081da177e4SLinus Torvalds }; 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* A helper to initialize to initialize an op error inside a 1111da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1121da177e4SLinus Torvalds * abort chunk. 1131da177e4SLinus Torvalds */ 1145bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 11500f1c2dfSWei Yongjun size_t paylen) 1161da177e4SLinus Torvalds { 1171da177e4SLinus Torvalds sctp_errhdr_t err; 1181da177e4SLinus Torvalds __u16 len; 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1211da177e4SLinus Torvalds err.cause = cause_code; 1221da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1231da177e4SLinus Torvalds err.length = htons(len); 1244a1c0107SVlad Yasevich chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1281da177e4SLinus Torvalds * 1291da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1301da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1311da177e4SLinus Torvalds * 1321da177e4SLinus Torvalds * 0 1 2 3 1331da177e4SLinus 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 1341da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1351da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1361da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1371da177e4SLinus Torvalds * | Initiate Tag | 1381da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1391da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1401da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1411da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1431da177e4SLinus Torvalds * | Initial TSN | 1441da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1451da177e4SLinus Torvalds * \ \ 1461da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1471da177e4SLinus Torvalds * \ \ 1481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1491da177e4SLinus Torvalds * 1501da177e4SLinus Torvalds * 1511da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1521da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1531da177e4SLinus Torvalds * 1541da177e4SLinus Torvalds * Fixed Parameters Status 1551da177e4SLinus Torvalds * ---------------------------------------------- 1561da177e4SLinus Torvalds * Initiate Tag Mandatory 1571da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 1581da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 1591da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 1601da177e4SLinus Torvalds * Initial TSN Mandatory 1611da177e4SLinus Torvalds * 1621da177e4SLinus Torvalds * Variable Parameters Status Type Value 1631da177e4SLinus Torvalds * ------------------------------------------------------------- 1641da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 1651da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 1661da177e4SLinus Torvalds * Cookie Preservative Optional 9 1671da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 1681da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 1691da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 1701da177e4SLinus Torvalds */ 1711da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 1721da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 173dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 1741da177e4SLinus Torvalds { 1751da177e4SLinus Torvalds sctp_inithdr_t init; 1761da177e4SLinus Torvalds union sctp_params addrs; 1771da177e4SLinus Torvalds size_t chunksize; 1781da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 1791da177e4SLinus Torvalds int num_types, addrs_len = 0; 1801da177e4SLinus Torvalds struct sctp_sock *sp; 1811da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 1823dbe8656SAl Viro __be16 types[2]; 1830f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 184131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 185131a47e3SVlad Yasevich int num_ext = 0; 186131a47e3SVlad Yasevich __u8 extensions[3]; 187730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 188730fc3d0SVlad Yasevich *auth_hmacs = NULL; 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1911da177e4SLinus Torvalds * 1921da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 1931da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 1941da177e4SLinus Torvalds */ 1951da177e4SLinus Torvalds retval = NULL; 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 1981da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2011da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2021da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2031da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2041da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds /* How many address types are needed? */ 2071da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2081da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types); 2111da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2128ee4be37SVlad Yasevich 213036b579bSVlad Yasevich if (sctp_prsctp_enable) 214036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 215036b579bSVlad Yasevich 216131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 217131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 218131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 219131a47e3SVlad Yasevich * INIT-ACK parameters. 220131a47e3SVlad Yasevich */ 221131a47e3SVlad Yasevich if (sctp_addip_enable) { 222131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 223131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 224131a47e3SVlad Yasevich num_ext += 2; 225131a47e3SVlad Yasevich } 226131a47e3SVlad Yasevich 2276fc791eeSmalc if (sp->adaptation_ind) 2281da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2296fc791eeSmalc 2301da177e4SLinus Torvalds chunksize += vparam_len; 2311da177e4SLinus Torvalds 232730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 233730fc3d0SVlad Yasevich if (sctp_auth_enable) { 234730fc3d0SVlad Yasevich /* Add random parameter length*/ 235730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 236730fc3d0SVlad Yasevich 237730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 238730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 239730fc3d0SVlad Yasevich if (auth_hmacs->length) 240730fc3d0SVlad Yasevich chunksize += ntohs(auth_hmacs->length); 241730fc3d0SVlad Yasevich else 242730fc3d0SVlad Yasevich auth_hmacs = NULL; 243730fc3d0SVlad Yasevich 244730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 245730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 246730fc3d0SVlad Yasevich if (auth_chunks->length) 247730fc3d0SVlad Yasevich chunksize += ntohs(auth_chunks->length); 248730fc3d0SVlad Yasevich else 2499baffaa6SVlad Yasevich auth_chunks = NULL; 250730fc3d0SVlad Yasevich 251730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 252730fc3d0SVlad Yasevich num_ext += 1; 253730fc3d0SVlad Yasevich } 254730fc3d0SVlad Yasevich 255131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 256131a47e3SVlad Yasevich if (num_ext) 257131a47e3SVlad Yasevich chunksize += sizeof(sctp_supported_ext_param_t) + num_ext; 258131a47e3SVlad Yasevich 2591da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2601da177e4SLinus Torvalds * 2611da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 2621da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 2631da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 2641da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 2651da177e4SLinus Torvalds * other address types if the Host Name address parameter is 2661da177e4SLinus Torvalds * present in the received INIT chunk. 2671da177e4SLinus Torvalds * 2681da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 2691da177e4SLinus Torvalds */ 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize); 2721da177e4SLinus Torvalds if (!retval) 2731da177e4SLinus Torvalds goto nodata; 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds retval->subh.init_hdr = 2761da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 2771da177e4SLinus Torvalds retval->param_hdr.v = 2781da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2811da177e4SLinus Torvalds * 2821da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 2831da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 2841da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 2851da177e4SLinus Torvalds * support any address type. 2861da177e4SLinus Torvalds */ 2871da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 2881da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 2891da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 2901da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 293131a47e3SVlad Yasevich 2947aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 295131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 296131a47e3SVlad Yasevich */ 297131a47e3SVlad Yasevich if (num_ext) { 298131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 299131a47e3SVlad Yasevich ext_param.param_hdr.length = 300131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 301131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 302131a47e3SVlad Yasevich &ext_param); 3038ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 304131a47e3SVlad Yasevich } 305131a47e3SVlad Yasevich 3061da177e4SLinus Torvalds if (sctp_prsctp_enable) 3071da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 308131a47e3SVlad Yasevich 3096fc791eeSmalc if (sp->adaptation_ind) { 3100f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3111da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3120f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3131da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3146fc791eeSmalc } 315131a47e3SVlad Yasevich 316730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 317730fc3d0SVlad Yasevich if (sctp_auth_enable) { 318730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 319730fc3d0SVlad Yasevich asoc->c.auth_random); 320730fc3d0SVlad Yasevich if (auth_hmacs) 321730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 322730fc3d0SVlad Yasevich auth_hmacs); 323730fc3d0SVlad Yasevich if (auth_chunks) 324730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 325730fc3d0SVlad Yasevich auth_chunks); 326730fc3d0SVlad Yasevich } 3271da177e4SLinus Torvalds nodata: 3281da177e4SLinus Torvalds kfree(addrs.v); 3291da177e4SLinus Torvalds return retval; 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3331da177e4SLinus Torvalds const struct sctp_chunk *chunk, 334dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3351da177e4SLinus Torvalds { 3361da177e4SLinus Torvalds sctp_inithdr_t initack; 3371da177e4SLinus Torvalds struct sctp_chunk *retval; 3381da177e4SLinus Torvalds union sctp_params addrs; 3396fc791eeSmalc struct sctp_sock *sp; 3401da177e4SLinus Torvalds int addrs_len; 3411da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3421da177e4SLinus Torvalds int cookie_len; 3431da177e4SLinus Torvalds size_t chunksize; 3440f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 345131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 346131a47e3SVlad Yasevich int num_ext = 0; 347131a47e3SVlad Yasevich __u8 extensions[3]; 348730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 349730fc3d0SVlad Yasevich *auth_hmacs = NULL, 350730fc3d0SVlad Yasevich *auth_random = NULL; 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds retval = NULL; 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 3551da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 3581da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 3591da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 3601da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 3611da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 3641da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 3651da177e4SLinus Torvalds */ 3661da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 3671da177e4SLinus Torvalds addrs.v, addrs_len); 3681da177e4SLinus Torvalds if (!cookie) 3691da177e4SLinus Torvalds goto nomem_cookie; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 3721da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 3731da177e4SLinus Torvalds */ 3746fc791eeSmalc sp = sctp_sk(asoc->base.sk); 3751da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 3781da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 3791da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 3801da177e4SLinus Torvalds 3815ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 382036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 383036b579bSVlad Yasevich 3845ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 385131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 386131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 387131a47e3SVlad Yasevich num_ext += 2; 388131a47e3SVlad Yasevich } 389131a47e3SVlad Yasevich 3906fc791eeSmalc if (sp->adaptation_ind) 3911da177e4SLinus Torvalds chunksize += sizeof(aiparam); 3921da177e4SLinus Torvalds 393730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 394730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 395730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 396730fc3d0SVlad Yasevich 397730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 398730fc3d0SVlad Yasevich if (auth_hmacs->length) 399730fc3d0SVlad Yasevich chunksize += ntohs(auth_hmacs->length); 400730fc3d0SVlad Yasevich else 401730fc3d0SVlad Yasevich auth_hmacs = NULL; 402730fc3d0SVlad Yasevich 403730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 404730fc3d0SVlad Yasevich if (auth_chunks->length) 405730fc3d0SVlad Yasevich chunksize += ntohs(auth_chunks->length); 406730fc3d0SVlad Yasevich else 407730fc3d0SVlad Yasevich auth_chunks = NULL; 408730fc3d0SVlad Yasevich 409730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 410730fc3d0SVlad Yasevich num_ext += 1; 411730fc3d0SVlad Yasevich } 412730fc3d0SVlad Yasevich 4138ee4be37SVlad Yasevich if (num_ext) 4148ee4be37SVlad Yasevich chunksize += sizeof(sctp_supported_ext_param_t) + num_ext; 4158ee4be37SVlad Yasevich 4161da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 4171da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize); 4181da177e4SLinus Torvalds if (!retval) 4191da177e4SLinus Torvalds goto nomem_chunk; 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds /* Per the advice in RFC 2960 6.4, send this reply to 4221da177e4SLinus Torvalds * the source of the INIT packet. 4231da177e4SLinus Torvalds */ 4241da177e4SLinus Torvalds retval->transport = chunk->transport; 4251da177e4SLinus Torvalds retval->subh.init_hdr = 4261da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4271da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4281da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4291da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4301da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 431131a47e3SVlad Yasevich if (num_ext) { 432131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 433131a47e3SVlad Yasevich ext_param.param_hdr.length = 434131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 435131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 436131a47e3SVlad Yasevich &ext_param); 4378ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 438131a47e3SVlad Yasevich } 4391da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 4401da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 4411da177e4SLinus Torvalds 4426fc791eeSmalc if (sp->adaptation_ind) { 4430f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 4441da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 4456fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 4461da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 4476fc791eeSmalc } 4481da177e4SLinus Torvalds 449730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 450730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 451730fc3d0SVlad Yasevich auth_random); 452730fc3d0SVlad Yasevich if (auth_hmacs) 453730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 454730fc3d0SVlad Yasevich auth_hmacs); 455730fc3d0SVlad Yasevich if (auth_chunks) 456730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 457730fc3d0SVlad Yasevich auth_chunks); 458730fc3d0SVlad Yasevich } 459730fc3d0SVlad Yasevich 4601da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 4611da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 4641da177e4SLinus Torvalds * 4651da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 4661da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 4671da177e4SLinus Torvalds * address from which it received the DATA or control chunk 4681da177e4SLinus Torvalds * to which it is replying. 4691da177e4SLinus Torvalds * 4701da177e4SLinus Torvalds * [INIT ACK back to where the INIT came from.] 4711da177e4SLinus Torvalds */ 4721da177e4SLinus Torvalds if (chunk) 4731da177e4SLinus Torvalds retval->transport = chunk->transport; 4741da177e4SLinus Torvalds 4751da177e4SLinus Torvalds nomem_chunk: 4761da177e4SLinus Torvalds kfree(cookie); 4771da177e4SLinus Torvalds nomem_cookie: 4781da177e4SLinus Torvalds kfree(addrs.v); 4791da177e4SLinus Torvalds return retval; 4801da177e4SLinus Torvalds } 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 4831da177e4SLinus Torvalds * 4841da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 4851da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 4861da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 4871da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 4881da177e4SLinus Torvalds * chunks in the same packet. 4891da177e4SLinus Torvalds * 4901da177e4SLinus Torvalds * 0 1 2 3 4911da177e4SLinus 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 4921da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4931da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 4941da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4951da177e4SLinus Torvalds * / Cookie / 4961da177e4SLinus Torvalds * \ \ 4971da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4981da177e4SLinus Torvalds * 4991da177e4SLinus Torvalds * Chunk Flags: 8 bit 5001da177e4SLinus Torvalds * 5011da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5021da177e4SLinus Torvalds * 5031da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5041da177e4SLinus Torvalds * 5051da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5061da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5071da177e4SLinus Torvalds * 5081da177e4SLinus Torvalds * Cookie: variable size 5091da177e4SLinus Torvalds * 5101da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5111da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5121da177e4SLinus Torvalds * 5131da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5141da177e4SLinus Torvalds * to insure interoperability. 5151da177e4SLinus Torvalds */ 5161da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5171da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5181da177e4SLinus Torvalds { 5191da177e4SLinus Torvalds struct sctp_chunk *retval; 5201da177e4SLinus Torvalds void *cookie; 5211da177e4SLinus Torvalds int cookie_len; 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5241da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 5271da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); 5281da177e4SLinus Torvalds if (!retval) 5291da177e4SLinus Torvalds goto nodata; 5301da177e4SLinus Torvalds retval->subh.cookie_hdr = 5311da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5341da177e4SLinus Torvalds * 5351da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5361da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5371da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5381da177e4SLinus Torvalds * to which it is replying. 5391da177e4SLinus Torvalds * 5401da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5411da177e4SLinus Torvalds */ 5421da177e4SLinus Torvalds if (chunk) 5431da177e4SLinus Torvalds retval->transport = chunk->transport; 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds nodata: 5461da177e4SLinus Torvalds return retval; 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5501da177e4SLinus Torvalds * 5511da177e4SLinus Torvalds * This chunk is used only during the initialization of an 5521da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 5531da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 5541da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 5551da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 5561da177e4SLinus Torvalds * 5571da177e4SLinus Torvalds * 0 1 2 3 5581da177e4SLinus 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 5591da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5601da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 5611da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5621da177e4SLinus Torvalds * 5631da177e4SLinus Torvalds * Chunk Flags: 8 bits 5641da177e4SLinus Torvalds * 5651da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5661da177e4SLinus Torvalds */ 5671da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 5681da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5691da177e4SLinus Torvalds { 5701da177e4SLinus Torvalds struct sctp_chunk *retval; 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0); 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5751da177e4SLinus Torvalds * 5761da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5771da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5781da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5791da177e4SLinus Torvalds * to which it is replying. 5801da177e4SLinus Torvalds * 5811da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 5821da177e4SLinus Torvalds */ 5831da177e4SLinus Torvalds if (retval && chunk) 5841da177e4SLinus Torvalds retval->transport = chunk->transport; 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds return retval; 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds /* 5901da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 5911da177e4SLinus Torvalds * CWR: 5921da177e4SLinus Torvalds * 5931da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 5941da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 5951da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 5961da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 5971da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 5981da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 5991da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6001da177e4SLinus Torvalds * CE bit. 6011da177e4SLinus Torvalds * 6021da177e4SLinus Torvalds * 0 1 2 3 6031da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 6041da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6051da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6061da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6071da177e4SLinus Torvalds * | Lowest TSN Number | 6081da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6091da177e4SLinus Torvalds * 6101da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6111da177e4SLinus Torvalds */ 6121da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6131da177e4SLinus Torvalds const __u32 lowest_tsn, 6141da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6151da177e4SLinus Torvalds { 6161da177e4SLinus Torvalds struct sctp_chunk *retval; 6171da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 6201da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0, 6211da177e4SLinus Torvalds sizeof(sctp_cwrhdr_t)); 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds if (!retval) 6241da177e4SLinus Torvalds goto nodata; 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6271da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6301da177e4SLinus Torvalds * 6311da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6321da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6331da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6341da177e4SLinus Torvalds * to which it is replying. 6351da177e4SLinus Torvalds * 6361da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6371da177e4SLinus Torvalds * came from.] 6381da177e4SLinus Torvalds */ 6391da177e4SLinus Torvalds if (chunk) 6401da177e4SLinus Torvalds retval->transport = chunk->transport; 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds nodata: 6431da177e4SLinus Torvalds return retval; 6441da177e4SLinus Torvalds } 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6471da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6481da177e4SLinus Torvalds const __u32 lowest_tsn) 6491da177e4SLinus Torvalds { 6501da177e4SLinus Torvalds struct sctp_chunk *retval; 6511da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 6541da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0, 6551da177e4SLinus Torvalds sizeof(sctp_ecnehdr_t)); 6561da177e4SLinus Torvalds if (!retval) 6571da177e4SLinus Torvalds goto nodata; 6581da177e4SLinus Torvalds retval->subh.ecne_hdr = 6591da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds nodata: 6621da177e4SLinus Torvalds return retval; 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 6661da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 6671da177e4SLinus Torvalds */ 6681da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 6691da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 6701da177e4SLinus Torvalds int data_len, __u8 flags, __u16 ssn) 6711da177e4SLinus Torvalds { 6721da177e4SLinus Torvalds struct sctp_chunk *retval; 6731da177e4SLinus Torvalds struct sctp_datahdr dp; 6741da177e4SLinus Torvalds int chunk_len; 6751da177e4SLinus Torvalds 6761da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 6771da177e4SLinus Torvalds * creating the chunk. 6781da177e4SLinus Torvalds */ 6791da177e4SLinus Torvalds dp.tsn = 0; 6801da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 6811da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 684eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 6851da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 6861da177e4SLinus Torvalds dp.ssn = 0; 6871da177e4SLinus Torvalds } else 6881da177e4SLinus Torvalds dp.ssn = htons(ssn); 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 6911da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len); 6921da177e4SLinus Torvalds if (!retval) 6931da177e4SLinus Torvalds goto nodata; 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 6961da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds nodata: 6991da177e4SLinus Torvalds return retval; 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7031da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7041da177e4SLinus Torvalds * including duplicates and gaps. 7051da177e4SLinus Torvalds */ 7061da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7071da177e4SLinus Torvalds { 7081da177e4SLinus Torvalds struct sctp_chunk *retval; 7091da177e4SLinus Torvalds struct sctp_sackhdr sack; 7101da177e4SLinus Torvalds int len; 7111da177e4SLinus Torvalds __u32 ctsn; 7121da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7131da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 71402015180SVlad Yasevich struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 7151da177e4SLinus Torvalds 71602015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7171da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 7181da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn); 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 72102015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7221da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds /* Initialize the SACK header. */ 7251da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7261da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7271da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7281da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds len = sizeof(sack) 7311da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7321da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds /* Create the chunk. */ 7351da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len); 7361da177e4SLinus Torvalds if (!retval) 7371da177e4SLinus Torvalds goto nodata; 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7401da177e4SLinus Torvalds * 7411da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7421da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7431da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7441da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7451da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7461da177e4SLinus Torvalds * reply chunk. 7471da177e4SLinus Torvalds * 7481da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 7491da177e4SLinus Torvalds * in packets from different source addresses in a single 7501da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 7511da177e4SLinus Torvalds * destination transport addresses from which the DATA or 7521da177e4SLinus Torvalds * control chunks being acknowledged were received. 7531da177e4SLinus Torvalds * 7541da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 7551da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 7561da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 7571da177e4SLinus Torvalds * duplicates. --piggy] 7581da177e4SLinus Torvalds * 7591da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 7601da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 7611da177e4SLinus Torvalds * destination address and not use the source address of the 7621da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 7631da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 7641da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 7651da177e4SLinus Torvalds * for the SACK is broken. 7661da177e4SLinus Torvalds * 7671da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 7681da177e4SLinus Torvalds */ 7691da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds retval->subh.sack_hdr = 7721da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds /* Add the gap ack block information. */ 7751da177e4SLinus Torvalds if (num_gabs) 7761da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 77702015180SVlad Yasevich gabs); 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 7801da177e4SLinus Torvalds if (num_dup_tsns) 7811da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 7821da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds nodata: 7851da177e4SLinus Torvalds return retval; 7861da177e4SLinus Torvalds } 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 7891da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 7901da177e4SLinus Torvalds const struct sctp_chunk *chunk) 7911da177e4SLinus Torvalds { 7921da177e4SLinus Torvalds struct sctp_chunk *retval; 7931da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 7941da177e4SLinus Torvalds __u32 ctsn; 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 7971da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0, 8001da177e4SLinus Torvalds sizeof(sctp_shutdownhdr_t)); 8011da177e4SLinus Torvalds if (!retval) 8021da177e4SLinus Torvalds goto nodata; 8031da177e4SLinus Torvalds 8041da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8051da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds if (chunk) 8081da177e4SLinus Torvalds retval->transport = chunk->transport; 8091da177e4SLinus Torvalds nodata: 8101da177e4SLinus Torvalds return retval; 8111da177e4SLinus Torvalds } 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8141da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8151da177e4SLinus Torvalds { 8161da177e4SLinus Torvalds struct sctp_chunk *retval; 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8211da177e4SLinus Torvalds * 8221da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8231da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8241da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8251da177e4SLinus Torvalds * to which it is replying. 8261da177e4SLinus Torvalds * 8271da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8281da177e4SLinus Torvalds */ 8291da177e4SLinus Torvalds if (retval && chunk) 8301da177e4SLinus Torvalds retval->transport = chunk->transport; 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds return retval; 8331da177e4SLinus Torvalds } 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 8361da177e4SLinus Torvalds const struct sctp_association *asoc, 8371da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8381da177e4SLinus Torvalds { 8391da177e4SLinus Torvalds struct sctp_chunk *retval; 8401da177e4SLinus Torvalds __u8 flags = 0; 8411da177e4SLinus Torvalds 842047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 843047a2428SJerome Forissier * reflected) 844047a2428SJerome Forissier */ 8451da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8501da177e4SLinus Torvalds * 8511da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8521da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8531da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8541da177e4SLinus Torvalds * to which it is replying. 8551da177e4SLinus Torvalds * 8561da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 8571da177e4SLinus Torvalds * came from.] 8581da177e4SLinus Torvalds */ 8591da177e4SLinus Torvalds if (retval && chunk) 8601da177e4SLinus Torvalds retval->transport = chunk->transport; 8611da177e4SLinus Torvalds 8621da177e4SLinus Torvalds return retval; 8631da177e4SLinus Torvalds } 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 866047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 8671da177e4SLinus Torvalds */ 8681da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 8691da177e4SLinus Torvalds const struct sctp_chunk *chunk, 8701da177e4SLinus Torvalds const size_t hint) 8711da177e4SLinus Torvalds { 8721da177e4SLinus Torvalds struct sctp_chunk *retval; 8731da177e4SLinus Torvalds __u8 flags = 0; 8741da177e4SLinus Torvalds 875047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 876047a2428SJerome Forissier * an INIT (vtag will be reflected). 877047a2428SJerome Forissier */ 878047a2428SJerome Forissier if (!asoc) { 879047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 880047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 881047a2428SJerome Forissier flags = 0; 882047a2428SJerome Forissier else 883047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 884047a2428SJerome Forissier } 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint); 8871da177e4SLinus Torvalds 8881da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8891da177e4SLinus Torvalds * 8901da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8911da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8921da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8931da177e4SLinus Torvalds * to which it is replying. 8941da177e4SLinus Torvalds * 8951da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 8961da177e4SLinus Torvalds */ 8971da177e4SLinus Torvalds if (retval && chunk) 8981da177e4SLinus Torvalds retval->transport = chunk->transport; 8991da177e4SLinus Torvalds 9001da177e4SLinus Torvalds return retval; 9011da177e4SLinus Torvalds } 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9041da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9051da177e4SLinus Torvalds const struct sctp_association *asoc, 9061da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 9071da177e4SLinus Torvalds { 9081da177e4SLinus Torvalds struct sctp_chunk *retval; 9099f81bcd9SAl Viro __be32 payload; 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9121da177e4SLinus Torvalds + sizeof(tsn)); 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds if (!retval) 9151da177e4SLinus Torvalds goto no_mem; 9161da177e4SLinus Torvalds 9171da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9181da177e4SLinus Torvalds payload = htonl(tsn); 91900f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 92000f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9231da177e4SLinus Torvalds * 9241da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9251da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9261da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9271da177e4SLinus Torvalds * to which it is replying. 9281da177e4SLinus Torvalds * 9291da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9301da177e4SLinus Torvalds */ 9311da177e4SLinus Torvalds if (chunk) 9321da177e4SLinus Torvalds retval->transport = chunk->transport; 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds no_mem: 9351da177e4SLinus Torvalds return retval; 9361da177e4SLinus Torvalds } 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 9391da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 940c164a9baSSridhar Samudrala const struct msghdr *msg, 941c164a9baSSridhar Samudrala size_t paylen) 9421da177e4SLinus Torvalds { 9431da177e4SLinus Torvalds struct sctp_chunk *retval; 944c164a9baSSridhar Samudrala void *payload = NULL; 945c164a9baSSridhar Samudrala int err; 9461da177e4SLinus Torvalds 947c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 9481da177e4SLinus Torvalds if (!retval) 9491da177e4SLinus Torvalds goto err_chunk; 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds if (paylen) { 9521da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 953c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 9541da177e4SLinus Torvalds if (!payload) 9551da177e4SLinus Torvalds goto err_payload; 9561da177e4SLinus Torvalds 957c164a9baSSridhar Samudrala err = memcpy_fromiovec(payload, msg->msg_iov, paylen); 958c164a9baSSridhar Samudrala if (err < 0) 9591da177e4SLinus Torvalds goto err_copy; 9601da177e4SLinus Torvalds } 9611da177e4SLinus Torvalds 96200f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 96300f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds if (paylen) 9661da177e4SLinus Torvalds kfree(payload); 9671da177e4SLinus Torvalds 9681da177e4SLinus Torvalds return retval; 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds err_copy: 9711da177e4SLinus Torvalds kfree(payload); 9721da177e4SLinus Torvalds err_payload: 9731da177e4SLinus Torvalds sctp_chunk_free(retval); 9741da177e4SLinus Torvalds retval = NULL; 9751da177e4SLinus Torvalds err_chunk: 9761da177e4SLinus Torvalds return retval; 9771da177e4SLinus Torvalds } 9781da177e4SLinus Torvalds 9795c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 9805c94bf86SAdrian Bunk * enough. 9815c94bf86SAdrian Bunk */ 9825c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 9835c94bf86SAdrian Bunk const void *data) 9845c94bf86SAdrian Bunk { 9855c94bf86SAdrian Bunk void *target; 9865c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 9875c94bf86SAdrian Bunk 9885c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 9895c94bf86SAdrian Bunk 9906383cfb3SVlad Yasevich if (data) 9915c94bf86SAdrian Bunk memcpy(target, data, len); 9926383cfb3SVlad Yasevich else 9936383cfb3SVlad Yasevich memset(target, 0, len); 9945c94bf86SAdrian Bunk 9955c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 9965c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 9975c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 9985c94bf86SAdrian Bunk 9995c94bf86SAdrian Bunk return target; 10005c94bf86SAdrian Bunk } 10015c94bf86SAdrian Bunk 10021da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10031da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10041da177e4SLinus Torvalds const struct sctp_association *asoc, 10051da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10061da177e4SLinus Torvalds const __u8 *payload, 10071da177e4SLinus Torvalds const size_t paylen) 10081da177e4SLinus Torvalds { 10091da177e4SLinus Torvalds struct sctp_chunk *retval; 10101da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10111da177e4SLinus Torvalds 10121da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 101300f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10141da177e4SLinus Torvalds if (!retval) 10151da177e4SLinus Torvalds goto end; 10161da177e4SLinus Torvalds 101700f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 101800f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10191da177e4SLinus Torvalds 10201da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10211da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 102200f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 102300f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 10241da177e4SLinus Torvalds 10251da177e4SLinus Torvalds end: 10261da177e4SLinus Torvalds return retval; 10271da177e4SLinus Torvalds } 10281da177e4SLinus Torvalds 1029ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1030ba016670SWei Yongjun const struct sctp_association *asoc, 1031ba016670SWei Yongjun const struct sctp_chunk *chunk, 1032ba016670SWei Yongjun struct sctp_paramhdr *param) 1033ba016670SWei Yongjun { 1034ba016670SWei Yongjun struct sctp_chunk *retval; 1035ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1036ba016670SWei Yongjun size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + 1037ba016670SWei Yongjun sizeof(sctp_paramhdr_t); 1038ba016670SWei Yongjun 1039ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1040ba016670SWei Yongjun if (!retval) 1041ba016670SWei Yongjun goto nodata; 1042ba016670SWei Yongjun 1043ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 1044ba016670SWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 1045ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 1046ba016670SWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); 1047ba016670SWei Yongjun 1048ba016670SWei Yongjun nodata: 1049ba016670SWei Yongjun return retval; 1050ba016670SWei Yongjun } 1051ba016670SWei Yongjun 10521da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 10531da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 10541da177e4SLinus Torvalds const struct sctp_transport *transport, 10551da177e4SLinus Torvalds const void *payload, const size_t paylen) 10561da177e4SLinus Torvalds { 10571da177e4SLinus Torvalds struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 10581da177e4SLinus Torvalds 0, paylen); 10591da177e4SLinus Torvalds 10601da177e4SLinus Torvalds if (!retval) 10611da177e4SLinus Torvalds goto nodata; 10621da177e4SLinus Torvalds 10631da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 10641da177e4SLinus Torvalds * what transport it belongs to. 10651da177e4SLinus Torvalds */ 10661da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 10671da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 10681da177e4SLinus Torvalds 10691da177e4SLinus Torvalds nodata: 10701da177e4SLinus Torvalds return retval; 10711da177e4SLinus Torvalds } 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 10741da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10751da177e4SLinus Torvalds const void *payload, const size_t paylen) 10761da177e4SLinus Torvalds { 10771da177e4SLinus Torvalds struct sctp_chunk *retval; 10781da177e4SLinus Torvalds 10791da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); 10801da177e4SLinus Torvalds if (!retval) 10811da177e4SLinus Torvalds goto nodata; 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 10841da177e4SLinus Torvalds 10851da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 10861da177e4SLinus Torvalds * 10871da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 10881da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 10891da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 10901da177e4SLinus Torvalds * to which it is replying. 10911da177e4SLinus Torvalds * 10921da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 10931da177e4SLinus Torvalds */ 10941da177e4SLinus Torvalds if (chunk) 10951da177e4SLinus Torvalds retval->transport = chunk->transport; 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds nodata: 10981da177e4SLinus Torvalds return retval; 10991da177e4SLinus Torvalds } 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 11021da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 11031da177e4SLinus Torvalds */ 11041da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 11051da177e4SLinus Torvalds const struct sctp_association *asoc, 11061da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11071da177e4SLinus Torvalds size_t size) 11081da177e4SLinus Torvalds { 11091da177e4SLinus Torvalds struct sctp_chunk *retval; 11101da177e4SLinus Torvalds 11111da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0, 11121da177e4SLinus Torvalds sizeof(sctp_errhdr_t) + size); 11131da177e4SLinus Torvalds if (!retval) 11141da177e4SLinus Torvalds goto nodata; 11151da177e4SLinus Torvalds 11161da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11171da177e4SLinus Torvalds * 11181da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11191da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 11201da177e4SLinus Torvalds * address from which it received the DATA or control chunk 11211da177e4SLinus Torvalds * to which it is replying. 11221da177e4SLinus Torvalds * 11231da177e4SLinus Torvalds */ 11241da177e4SLinus Torvalds if (chunk) 11251da177e4SLinus Torvalds retval->transport = chunk->transport; 11261da177e4SLinus Torvalds 11271da177e4SLinus Torvalds nodata: 11281da177e4SLinus Torvalds return retval; 11291da177e4SLinus Torvalds } 11301da177e4SLinus Torvalds 11311da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 11321da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 11331da177e4SLinus Torvalds const struct sctp_chunk *chunk, 113463706c5cSAl Viro __be16 cause_code, const void *payload, 11356383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 11361da177e4SLinus Torvalds { 11371da177e4SLinus Torvalds struct sctp_chunk *retval; 11381da177e4SLinus Torvalds 11396383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 11401da177e4SLinus Torvalds if (!retval) 11411da177e4SLinus Torvalds goto nodata; 11421da177e4SLinus Torvalds 11436383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 114400f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 11456383cfb3SVlad Yasevich if (reserve_tail) 11466383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 11471da177e4SLinus Torvalds 11481da177e4SLinus Torvalds nodata: 11491da177e4SLinus Torvalds return retval; 11501da177e4SLinus Torvalds } 11511da177e4SLinus Torvalds 11524cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 11534cd57c80SVlad Yasevich { 11544cd57c80SVlad Yasevich struct sctp_chunk *retval; 11554cd57c80SVlad Yasevich struct sctp_hmac *hmac_desc; 11564cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 11574cd57c80SVlad Yasevich __u8 *hmac; 11584cd57c80SVlad Yasevich 11594cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 11604cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 11614cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 11624cd57c80SVlad Yasevich return NULL; 11634cd57c80SVlad Yasevich 11644cd57c80SVlad Yasevich retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0, 11654cd57c80SVlad Yasevich hmac_desc->hmac_len + sizeof(sctp_authhdr_t)); 11664cd57c80SVlad Yasevich if (!retval) 11674cd57c80SVlad Yasevich return NULL; 11684cd57c80SVlad Yasevich 11694cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 11704cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 11714cd57c80SVlad Yasevich 11724cd57c80SVlad Yasevich retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), 11734cd57c80SVlad Yasevich &auth_hdr); 11744cd57c80SVlad Yasevich 11754cd57c80SVlad Yasevich hmac = skb_put(retval->skb, hmac_desc->hmac_len); 11764cd57c80SVlad Yasevich memset(hmac, 0, hmac_desc->hmac_len); 11774cd57c80SVlad Yasevich 11784cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 11794cd57c80SVlad Yasevich retval->chunk_hdr->length = 11804cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 11814cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 11824cd57c80SVlad Yasevich 11834cd57c80SVlad Yasevich return retval; 11844cd57c80SVlad Yasevich } 11854cd57c80SVlad Yasevich 11864cd57c80SVlad Yasevich 11871da177e4SLinus Torvalds /******************************************************************** 11881da177e4SLinus Torvalds * 2nd Level Abstractions 11891da177e4SLinus Torvalds ********************************************************************/ 11901da177e4SLinus Torvalds 11911da177e4SLinus Torvalds /* Turn an skb into a chunk. 11921da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 11931da177e4SLinus Torvalds */ 11941da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 11951da177e4SLinus Torvalds const struct sctp_association *asoc, 11961da177e4SLinus Torvalds struct sock *sk) 11971da177e4SLinus Torvalds { 11981da177e4SLinus Torvalds struct sctp_chunk *retval; 11991da177e4SLinus Torvalds 1200c3762229SRobert P. J. Day retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC); 12011da177e4SLinus Torvalds 12021da177e4SLinus Torvalds if (!retval) 12031da177e4SLinus Torvalds goto nodata; 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds if (!sk) { 12061da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb); 12071da177e4SLinus Torvalds } 12081da177e4SLinus Torvalds 120979af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 12101da177e4SLinus Torvalds retval->skb = skb; 12111da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 12121da177e4SLinus Torvalds retval->resent = 0; 12131da177e4SLinus Torvalds retval->has_tsn = 0; 12141da177e4SLinus Torvalds retval->has_ssn = 0; 12151da177e4SLinus Torvalds retval->rtt_in_progress = 0; 12161da177e4SLinus Torvalds retval->sent_at = 0; 12171da177e4SLinus Torvalds retval->singleton = 1; 12181da177e4SLinus Torvalds retval->end_of_packet = 0; 12191da177e4SLinus Torvalds retval->ecn_ce_done = 0; 12201da177e4SLinus Torvalds retval->pdiscard = 0; 12211da177e4SLinus Torvalds 12221da177e4SLinus Torvalds /* sctpimpguide-05.txt Section 2.8.2 12231da177e4SLinus Torvalds * M1) Each time a new DATA chunk is transmitted 12241da177e4SLinus Torvalds * set the 'TSN.Missing.Report' count for that TSN to 0. The 12251da177e4SLinus Torvalds * 'TSN.Missing.Report' count will be used to determine missing chunks 12261da177e4SLinus Torvalds * and when to fast retransmit. 12271da177e4SLinus Torvalds */ 12281da177e4SLinus Torvalds retval->tsn_missing_report = 0; 12291da177e4SLinus Torvalds retval->tsn_gap_acked = 0; 1230c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 12311da177e4SLinus Torvalds 12321da177e4SLinus Torvalds /* If this is a fragmented message, track all fragments 12331da177e4SLinus Torvalds * of the message (for SEND_FAILED). 12341da177e4SLinus Torvalds */ 12351da177e4SLinus Torvalds retval->msg = NULL; 12361da177e4SLinus Torvalds 12371da177e4SLinus Torvalds /* Polish the bead hole. */ 12381da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 12391da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 12401da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 12411da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 12421da177e4SLinus Torvalds 12431da177e4SLinus Torvalds nodata: 12441da177e4SLinus Torvalds return retval; 12451da177e4SLinus Torvalds } 12461da177e4SLinus Torvalds 12471da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 12481da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 12491da177e4SLinus Torvalds union sctp_addr *dest) 12501da177e4SLinus Torvalds { 1251f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 125216b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 12531da177e4SLinus Torvalds } 12541da177e4SLinus Torvalds 12551da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 12561da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 12571da177e4SLinus Torvalds { 12581da177e4SLinus Torvalds /* If we have a known transport, use that. */ 12591da177e4SLinus Torvalds if (chunk->transport) { 12606a1e5f33SAl Viro return &chunk->transport->ipaddr; 12611da177e4SLinus Torvalds } else { 12621da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 12636a1e5f33SAl Viro return &chunk->source; 12641da177e4SLinus Torvalds } 12651da177e4SLinus Torvalds } 12661da177e4SLinus Torvalds 12671da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 12681da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 12691da177e4SLinus Torvalds */ 12701da177e4SLinus Torvalds SCTP_STATIC 12711da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 12721da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen) 12731da177e4SLinus Torvalds { 12741da177e4SLinus Torvalds struct sctp_chunk *retval; 12751da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 12761da177e4SLinus Torvalds struct sk_buff *skb; 12771da177e4SLinus Torvalds struct sock *sk; 12781da177e4SLinus Torvalds 12791da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 12801da177e4SLinus Torvalds skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), 12811da177e4SLinus Torvalds GFP_ATOMIC); 12821da177e4SLinus Torvalds if (!skb) 12831da177e4SLinus Torvalds goto nodata; 12841da177e4SLinus Torvalds 12851da177e4SLinus Torvalds /* Make room for the chunk header. */ 12861da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 12871da177e4SLinus Torvalds chunk_hdr->type = type; 12881da177e4SLinus Torvalds chunk_hdr->flags = flags; 12891da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 12901da177e4SLinus Torvalds 12911da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 12921da177e4SLinus Torvalds retval = sctp_chunkify(skb, asoc, sk); 12931da177e4SLinus Torvalds if (!retval) { 12941da177e4SLinus Torvalds kfree_skb(skb); 12951da177e4SLinus Torvalds goto nodata; 12961da177e4SLinus Torvalds } 12971da177e4SLinus Torvalds 12981da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 12991da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 13001da177e4SLinus Torvalds 13014cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 13024cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 13034cd57c80SVlad Yasevich retval->auth = 1; 13044cd57c80SVlad Yasevich 13051da177e4SLinus Torvalds /* Set the skb to the belonging sock for accounting. */ 13061da177e4SLinus Torvalds skb->sk = sk; 13071da177e4SLinus Torvalds 13081da177e4SLinus Torvalds return retval; 13091da177e4SLinus Torvalds nodata: 13101da177e4SLinus Torvalds return NULL; 13111da177e4SLinus Torvalds } 13121da177e4SLinus Torvalds 13131da177e4SLinus Torvalds 13141da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 13151da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 13161da177e4SLinus Torvalds { 1317a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1318a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1319a08de64dSVlad Yasevich 13201da177e4SLinus Torvalds /* Free the chunk skb data and the SCTP_chunk stub itself. */ 13211da177e4SLinus Torvalds dev_kfree_skb(chunk->skb); 13221da177e4SLinus Torvalds 13231da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 13241da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 13251da177e4SLinus Torvalds } 13261da177e4SLinus Torvalds 13271da177e4SLinus Torvalds /* Possibly, free the chunk. */ 13281da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 13291da177e4SLinus Torvalds { 13301da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 13311da177e4SLinus Torvalds if (chunk->msg) 13321da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 13331da177e4SLinus Torvalds 13341da177e4SLinus Torvalds sctp_chunk_put(chunk); 13351da177e4SLinus Torvalds } 13361da177e4SLinus Torvalds 13371da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 13381da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 13391da177e4SLinus Torvalds { 13401da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 13411da177e4SLinus Torvalds } 13421da177e4SLinus Torvalds 13431da177e4SLinus Torvalds /* Release a reference to the chunk. */ 13441da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 13451da177e4SLinus Torvalds { 13461da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 13471da177e4SLinus Torvalds sctp_chunk_destroy(ch); 13481da177e4SLinus Torvalds } 13491da177e4SLinus Torvalds 13501da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 13511da177e4SLinus Torvalds * enough. 13521da177e4SLinus Torvalds */ 13531da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 13541da177e4SLinus Torvalds { 13551da177e4SLinus Torvalds void *target; 13561da177e4SLinus Torvalds void *padding; 13571da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 13588d614adeSWei Yongjun int padlen = WORD_ROUND(chunklen) - chunklen; 13591da177e4SLinus Torvalds 13601da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 13611da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds memset(padding, 0, padlen); 13641da177e4SLinus Torvalds memcpy(target, data, len); 13651da177e4SLinus Torvalds 13661da177e4SLinus Torvalds /* Adjust the chunk length field. */ 13671da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 136827a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 13691da177e4SLinus Torvalds 13701da177e4SLinus Torvalds return target; 13711da177e4SLinus Torvalds } 13721da177e4SLinus Torvalds 13731da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 13741da177e4SLinus Torvalds * chunk is not big enough. 13751da177e4SLinus Torvalds * Returns a kernel err value. 13761da177e4SLinus Torvalds */ 13771da177e4SLinus Torvalds int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 13781da177e4SLinus Torvalds struct iovec *data) 13791da177e4SLinus Torvalds { 13801da177e4SLinus Torvalds __u8 *target; 13811da177e4SLinus Torvalds int err = 0; 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds /* Make room in chunk for data. */ 13841da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 13851da177e4SLinus Torvalds 13861da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 13871da177e4SLinus Torvalds if ((err = memcpy_fromiovecend(target, data, off, len))) 13881da177e4SLinus Torvalds goto out; 13891da177e4SLinus Torvalds 13901da177e4SLinus Torvalds /* Adjust the chunk length field. */ 13911da177e4SLinus Torvalds chunk->chunk_hdr->length = 13921da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 139327a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 13941da177e4SLinus Torvalds 13951da177e4SLinus Torvalds out: 13961da177e4SLinus Torvalds return err; 13971da177e4SLinus Torvalds } 13981da177e4SLinus Torvalds 13991da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 14001da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 14011da177e4SLinus Torvalds */ 14021da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 14031da177e4SLinus Torvalds { 1404ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1405ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1406ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 14071da177e4SLinus Torvalds __u16 ssn; 14081da177e4SLinus Torvalds __u16 sid; 14091da177e4SLinus Torvalds 14101da177e4SLinus Torvalds if (chunk->has_ssn) 14111da177e4SLinus Torvalds return; 14121da177e4SLinus Torvalds 1413ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1414ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1415ab3e5e7bSVlad Yasevich stream = &chunk->asoc->ssnmap->out; 1416ab3e5e7bSVlad Yasevich 1417ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1418ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1419ab3e5e7bSVlad Yasevich */ 1420ab3e5e7bSVlad Yasevich msg = chunk->msg; 1421ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1422ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 14231da177e4SLinus Torvalds ssn = 0; 14241da177e4SLinus Torvalds } else { 1425ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1426ab3e5e7bSVlad Yasevich ssn = sctp_ssn_next(stream, sid); 14271da177e4SLinus Torvalds else 1428ab3e5e7bSVlad Yasevich ssn = sctp_ssn_peek(stream, sid); 14291da177e4SLinus Torvalds } 14301da177e4SLinus Torvalds 1431ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1432ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1433ab3e5e7bSVlad Yasevich } 14341da177e4SLinus Torvalds } 14351da177e4SLinus Torvalds 14361da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 14371da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 14381da177e4SLinus Torvalds */ 14391da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 14401da177e4SLinus Torvalds { 14411da177e4SLinus Torvalds if (!chunk->has_tsn) { 14421da177e4SLinus Torvalds /* This is the last possible instant to 14431da177e4SLinus Torvalds * assign a TSN. 14441da177e4SLinus Torvalds */ 14451da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 14461da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 14471da177e4SLinus Torvalds chunk->has_tsn = 1; 14481da177e4SLinus Torvalds } 14491da177e4SLinus Torvalds } 14501da177e4SLinus Torvalds 14511da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 14521da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 14533182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1454dd0fc66fSAl Viro gfp_t gfp) 14551da177e4SLinus Torvalds { 14561da177e4SLinus Torvalds struct sctp_association *asoc; 14571da177e4SLinus Torvalds struct sk_buff *skb; 14581da177e4SLinus Torvalds sctp_scope_t scope; 14591da177e4SLinus Torvalds struct sctp_af *af; 14601da177e4SLinus Torvalds 14611da177e4SLinus Torvalds /* Create the bare association. */ 14621da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 14631da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 14641da177e4SLinus Torvalds if (!asoc) 14651da177e4SLinus Torvalds goto nodata; 14661da177e4SLinus Torvalds asoc->temp = 1; 14671da177e4SLinus Torvalds skb = chunk->skb; 14681da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1469eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); 14701da177e4SLinus Torvalds if (unlikely(!af)) 14711da177e4SLinus Torvalds goto fail; 1472d55c41b1SAl Viro af->from_skb(&asoc->c.peer_addr, skb, 1); 14731da177e4SLinus Torvalds nodata: 14741da177e4SLinus Torvalds return asoc; 14751da177e4SLinus Torvalds 14761da177e4SLinus Torvalds fail: 14771da177e4SLinus Torvalds sctp_association_free(asoc); 14781da177e4SLinus Torvalds return NULL; 14791da177e4SLinus Torvalds } 14801da177e4SLinus Torvalds 14811da177e4SLinus Torvalds /* Build a cookie representing asoc. 14821da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 14831da177e4SLinus Torvalds */ 14841da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 14851da177e4SLinus Torvalds const struct sctp_association *asoc, 14861da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 14871da177e4SLinus Torvalds int *cookie_len, 14881da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 14891da177e4SLinus Torvalds { 14901da177e4SLinus Torvalds sctp_cookie_param_t *retval; 14911da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 14921da177e4SLinus Torvalds struct scatterlist sg; 14931da177e4SLinus Torvalds int headersize, bodysize; 14941da177e4SLinus Torvalds unsigned int keylen; 14951da177e4SLinus Torvalds char *key; 14961da177e4SLinus Torvalds 14979834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 14989834a2bbSVlad Yasevich * any padding. 14999834a2bbSVlad Yasevich */ 15009834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 15019834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 15029834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 15031da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 15041da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 15051da177e4SLinus Torvalds 15061da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 15071da177e4SLinus Torvalds * functions simpler to write. 15081da177e4SLinus Torvalds */ 15091da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 15101da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 15111da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 15121da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 15131da177e4SLinus Torvalds 15141da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 15151da177e4SLinus Torvalds * out on the network. 15161da177e4SLinus Torvalds */ 1517af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1518af997d8cSArnaldo Carvalho de Melo if (!retval) 1519af997d8cSArnaldo Carvalho de Melo goto nodata; 1520af997d8cSArnaldo Carvalho de Melo 15211da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 15221da177e4SLinus Torvalds 15231da177e4SLinus Torvalds /* Set up the parameter header. */ 15241da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 15251da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 15261da177e4SLinus Torvalds 15271da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 15281da177e4SLinus Torvalds cookie->c = asoc->c; 15291da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 15301da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 15311da177e4SLinus Torvalds 15321da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 15331da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 15341da177e4SLinus Torvalds 15350f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 15360f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 15371da177e4SLinus Torvalds 15381da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 15391da177e4SLinus Torvalds do_gettimeofday(&cookie->c.expiration); 15401da177e4SLinus Torvalds TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration); 15411da177e4SLinus Torvalds 15421da177e4SLinus Torvalds /* Copy the peer's init packet. */ 15431da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 15441da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 15451da177e4SLinus Torvalds 15461da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 15471da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 15481da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 15491da177e4SLinus Torvalds 15501da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 15511b489e11SHerbert Xu struct hash_desc desc; 15521b489e11SHerbert Xu 15531da177e4SLinus Torvalds /* Sign the message. */ 155468e3f5ddSHerbert Xu sg_init_one(&sg, &cookie->c, bodysize); 15551da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 15561da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 15571b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 15581b489e11SHerbert Xu desc.flags = 0; 15591da177e4SLinus Torvalds 15601b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 15611b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) 15621b489e11SHerbert Xu goto free_cookie; 15631da177e4SLinus Torvalds } 15641da177e4SLinus Torvalds 15651da177e4SLinus Torvalds return retval; 15661b489e11SHerbert Xu 15671b489e11SHerbert Xu free_cookie: 15681b489e11SHerbert Xu kfree(retval); 15691b489e11SHerbert Xu nodata: 15701b489e11SHerbert Xu *cookie_len = 0; 15711b489e11SHerbert Xu return NULL; 15721da177e4SLinus Torvalds } 15731da177e4SLinus Torvalds 15741da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 15751da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 15761da177e4SLinus Torvalds const struct sctp_endpoint *ep, 15771da177e4SLinus Torvalds const struct sctp_association *asoc, 1578dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 15791da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 15801da177e4SLinus Torvalds { 15811da177e4SLinus Torvalds struct sctp_association *retval = NULL; 15821da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 15831da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 15841da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1585313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 15861da177e4SLinus Torvalds struct scatterlist sg; 15871da177e4SLinus Torvalds unsigned int keylen, len; 15881da177e4SLinus Torvalds char *key; 15891da177e4SLinus Torvalds sctp_scope_t scope; 15901da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1591a61bbcf2SPatrick McHardy struct timeval tv; 15921b489e11SHerbert Xu struct hash_desc desc; 15931da177e4SLinus Torvalds 15949834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 15959834a2bbSVlad Yasevich * any padding. 15969834a2bbSVlad Yasevich */ 15979834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 15989834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 15999834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16001da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 16011da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 16021da177e4SLinus Torvalds 16031da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 16041da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 16051da177e4SLinus Torvalds * INIT chunk. 16061da177e4SLinus Torvalds */ 16071da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 16081da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 16091da177e4SLinus Torvalds goto malformed; 16101da177e4SLinus Torvalds 16111da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 16121da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16131da177e4SLinus Torvalds goto malformed; 16141da177e4SLinus Torvalds 16151da177e4SLinus Torvalds /* Process the cookie. */ 16161da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 16171da177e4SLinus Torvalds bear_cookie = &cookie->c; 16181da177e4SLinus Torvalds 16191da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 16201da177e4SLinus Torvalds goto no_hmac; 16211da177e4SLinus Torvalds 16221da177e4SLinus Torvalds /* Check the signature. */ 16231da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 162468e3f5ddSHerbert Xu sg_init_one(&sg, bear_cookie, bodysize); 16251da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 16261b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 16271b489e11SHerbert Xu desc.flags = 0; 16281da177e4SLinus Torvalds 16298ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 16301b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 16311b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 16321b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 16331b489e11SHerbert Xu goto fail; 16341b489e11SHerbert Xu } 16351da177e4SLinus Torvalds 16361da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 16371da177e4SLinus Torvalds /* Try the previous key. */ 16381da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->last_key]; 16398ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 16401b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 16411b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 16421b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 16431b489e11SHerbert Xu goto fail; 16441b489e11SHerbert Xu } 16451da177e4SLinus Torvalds 16461da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 16471da177e4SLinus Torvalds /* Yikes! Still bad signature! */ 16481da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 16491da177e4SLinus Torvalds goto fail; 16501da177e4SLinus Torvalds } 16511da177e4SLinus Torvalds } 16521da177e4SLinus Torvalds 16531da177e4SLinus Torvalds no_hmac: 16541da177e4SLinus Torvalds /* IG Section 2.35.2: 16551da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 16561da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 16571da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 16581da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 16591da177e4SLinus Torvalds * discarded, 16601da177e4SLinus Torvalds */ 16611da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 16621da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 16631da177e4SLinus Torvalds goto fail; 16641da177e4SLinus Torvalds } 16651da177e4SLinus Torvalds 16669b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 16671da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 16681da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 16691da177e4SLinus Torvalds goto fail; 16701da177e4SLinus Torvalds } 16711da177e4SLinus Torvalds 16721da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 16731da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 16741da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1675f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1676f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1677f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1678f236218bSVlad Yasevich * down the new association establishment instead of every packet. 16791da177e4SLinus Torvalds */ 1680f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 1681a61bbcf2SPatrick McHardy skb_get_timestamp(skb, &tv); 1682f236218bSVlad Yasevich else 1683f236218bSVlad Yasevich do_gettimeofday(&tv); 1684f236218bSVlad Yasevich 1685a61bbcf2SPatrick McHardy if (!asoc && tv_lt(bear_cookie->expiration, tv)) { 16861da177e4SLinus Torvalds /* 16871da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 16881da177e4SLinus Torvalds * 16891da177e4SLinus Torvalds * Cause of error 16901da177e4SLinus Torvalds * --------------- 16911da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 16921da177e4SLinus Torvalds * Cookie that has expired. 16931da177e4SLinus Torvalds */ 16941da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 16951da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 16961da177e4SLinus Torvalds if (*errp) { 1697a61bbcf2SPatrick McHardy suseconds_t usecs = (tv.tv_sec - 16981da177e4SLinus Torvalds bear_cookie->expiration.tv_sec) * 1000000L + 1699a61bbcf2SPatrick McHardy tv.tv_usec - bear_cookie->expiration.tv_usec; 170034bcca28SAl Viro __be32 n = htonl(usecs); 17011da177e4SLinus Torvalds 17021da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 170300f1c2dfSWei Yongjun sizeof(n)); 170400f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 17051da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 17061da177e4SLinus Torvalds } else 17071da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17081da177e4SLinus Torvalds 17091da177e4SLinus Torvalds goto fail; 17101da177e4SLinus Torvalds } 17111da177e4SLinus Torvalds 17121da177e4SLinus Torvalds /* Make a new base association. */ 17131da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 17141da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 17151da177e4SLinus Torvalds if (!retval) { 17161da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17171da177e4SLinus Torvalds goto fail; 17181da177e4SLinus Torvalds } 17191da177e4SLinus Torvalds 17201da177e4SLinus Torvalds /* Set up our peer's port number. */ 17211da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds /* Populate the association from the cookie. */ 17241da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 17251da177e4SLinus Torvalds 17261da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 17271da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 17281da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17291da177e4SLinus Torvalds goto fail; 17301da177e4SLinus Torvalds } 17311da177e4SLinus Torvalds 17321da177e4SLinus Torvalds /* Also, add the destination address. */ 17331da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1734f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1735f57d96b2SVlad Yasevich SCTP_ADDR_SRC, GFP_ATOMIC); 17361da177e4SLinus Torvalds } 17371da177e4SLinus Torvalds 17381da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 17391da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 17401da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 17411da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 17421da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 17430f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 17441da177e4SLinus Torvalds 17451da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 17461da177e4SLinus Torvalds return retval; 17471da177e4SLinus Torvalds 17481da177e4SLinus Torvalds fail: 17491da177e4SLinus Torvalds if (retval) 17501da177e4SLinus Torvalds sctp_association_free(retval); 17511da177e4SLinus Torvalds 17521da177e4SLinus Torvalds return NULL; 17531da177e4SLinus Torvalds 17541da177e4SLinus Torvalds malformed: 17551da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 17561da177e4SLinus Torvalds * malformed. 17571da177e4SLinus Torvalds */ 17581da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 17591da177e4SLinus Torvalds goto fail; 17601da177e4SLinus Torvalds } 17611da177e4SLinus Torvalds 17621da177e4SLinus Torvalds /******************************************************************** 17631da177e4SLinus Torvalds * 3rd Level Abstractions 17641da177e4SLinus Torvalds ********************************************************************/ 17651da177e4SLinus Torvalds 17661da177e4SLinus Torvalds struct __sctp_missing { 17679f81bcd9SAl Viro __be32 num_missing; 17689f81bcd9SAl Viro __be16 type; 17691da177e4SLinus Torvalds } __attribute__((packed)); 17701da177e4SLinus Torvalds 17711da177e4SLinus Torvalds /* 17721da177e4SLinus Torvalds * Report a missing mandatory parameter. 17731da177e4SLinus Torvalds */ 17741da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 17751da177e4SLinus Torvalds sctp_param_t paramtype, 17761da177e4SLinus Torvalds struct sctp_chunk *chunk, 17771da177e4SLinus Torvalds struct sctp_chunk **errp) 17781da177e4SLinus Torvalds { 17791da177e4SLinus Torvalds struct __sctp_missing report; 17801da177e4SLinus Torvalds __u16 len; 17811da177e4SLinus Torvalds 17821da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 17831da177e4SLinus Torvalds 17841da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 17851da177e4SLinus Torvalds * returning multiple unknown parameters. 17861da177e4SLinus Torvalds */ 17871da177e4SLinus Torvalds if (!*errp) 17881da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 17891da177e4SLinus Torvalds 17901da177e4SLinus Torvalds if (*errp) { 17911da177e4SLinus Torvalds report.num_missing = htonl(1); 17921da177e4SLinus Torvalds report.type = paramtype; 1793ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 179400f1c2dfSWei Yongjun sizeof(report)); 179500f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 17961da177e4SLinus Torvalds } 17971da177e4SLinus Torvalds 17981da177e4SLinus Torvalds /* Stop processing this chunk. */ 17991da177e4SLinus Torvalds return 0; 18001da177e4SLinus Torvalds } 18011da177e4SLinus Torvalds 18021da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 18031da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 18041da177e4SLinus Torvalds struct sctp_chunk *chunk, 18051da177e4SLinus Torvalds struct sctp_chunk **errp) 18061da177e4SLinus Torvalds { 18071da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 18081da177e4SLinus Torvalds 18091da177e4SLinus Torvalds if (!*errp) 18101da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 18111da177e4SLinus Torvalds 18121da177e4SLinus Torvalds if (*errp) 181300f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 18141da177e4SLinus Torvalds 18151da177e4SLinus Torvalds /* Stop processing this chunk. */ 18161da177e4SLinus Torvalds return 0; 18171da177e4SLinus Torvalds } 18181da177e4SLinus Torvalds 18191da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 18201da177e4SLinus Torvalds struct sctp_paramhdr *param, 18211da177e4SLinus Torvalds const struct sctp_chunk *chunk, 18221da177e4SLinus Torvalds struct sctp_chunk **errp) 18231da177e4SLinus Torvalds { 18247ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 18257ab90804SVlad Yasevich * not reported. 18267ab90804SVlad Yasevich */ 18277ab90804SVlad Yasevich if (*errp) 18287ab90804SVlad Yasevich sctp_chunk_free(*errp); 18297ab90804SVlad Yasevich 18301da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1831ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 18321da177e4SLinus Torvalds 18331da177e4SLinus Torvalds return 0; 18341da177e4SLinus Torvalds } 18351da177e4SLinus Torvalds 18361da177e4SLinus Torvalds 18371da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 18381da177e4SLinus Torvalds * send back an indicator to the peer. 18391da177e4SLinus Torvalds */ 18401da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 18411da177e4SLinus Torvalds union sctp_params param, 18421da177e4SLinus Torvalds struct sctp_chunk *chunk, 18431da177e4SLinus Torvalds struct sctp_chunk **errp) 18441da177e4SLinus Torvalds { 18451da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 18461da177e4SLinus Torvalds 18477ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 18487ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 18497ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 18507ab90804SVlad Yasevich * them in the ABORT. 18517ab90804SVlad Yasevich */ 18527ab90804SVlad Yasevich if (*errp) 18537ab90804SVlad Yasevich sctp_chunk_free(*errp); 18547ab90804SVlad Yasevich 18551da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18561da177e4SLinus Torvalds 185700f1c2dfSWei Yongjun if (*errp) { 185800f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 185900f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 186000f1c2dfSWei Yongjun } 18611da177e4SLinus Torvalds 18621da177e4SLinus Torvalds /* Stop processing this chunk. */ 18631da177e4SLinus Torvalds return 0; 18641da177e4SLinus Torvalds } 18651da177e4SLinus Torvalds 1866d6701191SVlad Yasevich static int sctp_verify_ext_param(union sctp_params param) 1867d6701191SVlad Yasevich { 1868d6701191SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1869d6701191SVlad Yasevich int have_auth = 0; 1870d6701191SVlad Yasevich int have_asconf = 0; 1871d6701191SVlad Yasevich int i; 1872d6701191SVlad Yasevich 1873d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1874d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1875d6701191SVlad Yasevich case SCTP_CID_AUTH: 1876d6701191SVlad Yasevich have_auth = 1; 1877d6701191SVlad Yasevich break; 1878d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1879d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1880d6701191SVlad Yasevich have_asconf = 1; 1881d6701191SVlad Yasevich break; 1882d6701191SVlad Yasevich } 1883d6701191SVlad Yasevich } 1884d6701191SVlad Yasevich 1885d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1886d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 1887d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 1888d6701191SVlad Yasevich * mode. 1889d6701191SVlad Yasevich */ 1890d6701191SVlad Yasevich if (sctp_addip_noauth) 1891d6701191SVlad Yasevich return 1; 1892d6701191SVlad Yasevich 1893d6701191SVlad Yasevich if (sctp_addip_enable && !have_auth && have_asconf) 1894d6701191SVlad Yasevich return 0; 1895d6701191SVlad Yasevich 1896d6701191SVlad Yasevich return 1; 1897d6701191SVlad Yasevich } 1898d6701191SVlad Yasevich 1899131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 1900131a47e3SVlad Yasevich union sctp_params param) 1901131a47e3SVlad Yasevich { 1902131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1903131a47e3SVlad Yasevich int i; 1904131a47e3SVlad Yasevich 1905131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 1906131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 1907131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 1908131a47e3SVlad Yasevich if (sctp_prsctp_enable && 1909131a47e3SVlad Yasevich !asoc->peer.prsctp_capable) 1910131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 1911131a47e3SVlad Yasevich break; 1912730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 1913730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 1914730fc3d0SVlad Yasevich * supports AUTH. 1915730fc3d0SVlad Yasevich */ 19160ef46e28SVlad Yasevich if (sctp_auth_enable) 1917730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 1918730fc3d0SVlad Yasevich break; 1919131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 1920131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 19210ef46e28SVlad Yasevich if (sctp_addip_enable) 192288799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 19236b2f9cb6SVlad Yasevich break; 1924131a47e3SVlad Yasevich default: 1925131a47e3SVlad Yasevich break; 1926131a47e3SVlad Yasevich } 1927131a47e3SVlad Yasevich } 1928131a47e3SVlad Yasevich } 1929131a47e3SVlad Yasevich 19301da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 19311da177e4SLinus Torvalds * 19321da177e4SLinus Torvalds * The Parameter Types are encoded such that the 19331da177e4SLinus Torvalds * highest-order two bits specify the action that must be 19341da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 19351da177e4SLinus Torvalds * Parameter Type. 19361da177e4SLinus Torvalds * 19377ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 19387ab90804SVlad Yasevich * parameters within this chunk 19391da177e4SLinus Torvalds * 19407ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 19417ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 19427ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 19431da177e4SLinus Torvalds * 19441da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 19451da177e4SLinus Torvalds * 19461da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 19471da177e4SLinus Torvalds * report the unrecognized parameter in an 19487ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 19491da177e4SLinus Torvalds * 19501da177e4SLinus Torvalds * Return value: 19517ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 19527ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 19537ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 19541da177e4SLinus Torvalds */ 19557ab90804SVlad Yasevich static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, 19561da177e4SLinus Torvalds union sctp_params param, 19571da177e4SLinus Torvalds struct sctp_chunk *chunk, 19581da177e4SLinus Torvalds struct sctp_chunk **errp) 19591da177e4SLinus Torvalds { 19607ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 19611da177e4SLinus Torvalds 19621da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 19631da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 19647ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 19651da177e4SLinus Torvalds break; 19661da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 19671da177e4SLinus Torvalds break; 19687ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 19697ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 19707ab90804SVlad Yasevich /* Fall through */ 19711da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 19721da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 19731da177e4SLinus Torvalds * returning multiple unknown parameters. 19741da177e4SLinus Torvalds */ 19751da177e4SLinus Torvalds if (NULL == *errp) 19761da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 19771da177e4SLinus Torvalds ntohs(chunk->chunk_hdr->length)); 19781da177e4SLinus Torvalds 19791da177e4SLinus Torvalds if (*errp) { 19801da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, 19811da177e4SLinus Torvalds WORD_ROUND(ntohs(param.p->length))); 198200f1c2dfSWei Yongjun sctp_addto_chunk(*errp, 198300f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 198400f1c2dfSWei Yongjun param.v); 19851da177e4SLinus Torvalds } else { 19861da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 19871da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 19881da177e4SLinus Torvalds * to the peer and the association won't be 19891da177e4SLinus Torvalds * established. 19901da177e4SLinus Torvalds */ 19917ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 19921da177e4SLinus Torvalds } 19931da177e4SLinus Torvalds break; 19941da177e4SLinus Torvalds default: 19951da177e4SLinus Torvalds break; 19961da177e4SLinus Torvalds } 19971da177e4SLinus Torvalds 19981da177e4SLinus Torvalds return retval; 19991da177e4SLinus Torvalds } 20001da177e4SLinus Torvalds 20017ab90804SVlad Yasevich /* Verify variable length parameters 20021da177e4SLinus Torvalds * Return values: 20037ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 20047ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 20057ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 20067ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20071da177e4SLinus Torvalds */ 20087ab90804SVlad Yasevich static sctp_ierror_t sctp_verify_param(const struct sctp_association *asoc, 20091da177e4SLinus Torvalds union sctp_params param, 20101da177e4SLinus Torvalds sctp_cid_t cid, 20111da177e4SLinus Torvalds struct sctp_chunk *chunk, 20121da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 20131da177e4SLinus Torvalds { 201472da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 20157ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 201672da7b38SWei Yongjun __u16 n_elt, id = 0; 201772da7b38SWei Yongjun int i; 20181da177e4SLinus Torvalds 20191da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 20201da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 20211da177e4SLinus Torvalds * identified based on the chunk id. 20221da177e4SLinus Torvalds */ 20231da177e4SLinus Torvalds 20241da177e4SLinus Torvalds switch (param.p->type) { 20251da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 20261da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 20271da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 20281da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 20291da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 20301da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 20311da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 20321da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 20330f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2034d6701191SVlad Yasevich break; 2035d6701191SVlad Yasevich 2036131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2037d6701191SVlad Yasevich if (!sctp_verify_ext_param(param)) 2038d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 20391da177e4SLinus Torvalds break; 20401da177e4SLinus Torvalds 2041d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2042d6de3097SVlad Yasevich if (sctp_addip_enable) 2043d6de3097SVlad Yasevich break; 2044d6de3097SVlad Yasevich goto fallthrough; 2045d6de3097SVlad Yasevich 20461da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 20471da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 20487ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 20497ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 20507ab90804SVlad Yasevich break; 2051131a47e3SVlad Yasevich 20521da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 20531da177e4SLinus Torvalds if (sctp_prsctp_enable) 20541da177e4SLinus Torvalds break; 2055730fc3d0SVlad Yasevich goto fallthrough; 2056730fc3d0SVlad Yasevich 2057730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2058730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2059730fc3d0SVlad Yasevich goto fallthrough; 2060730fc3d0SVlad Yasevich 2061730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2062730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2063730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2064730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2065730fc3d0SVlad Yasevich */ 2066730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 20677ab90804SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { 20687ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2069730fc3d0SVlad Yasevich chunk, err_chunk); 20707ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 20717ab90804SVlad Yasevich } 2072730fc3d0SVlad Yasevich break; 2073730fc3d0SVlad Yasevich 2074730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2075730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2076730fc3d0SVlad Yasevich goto fallthrough; 2077730fc3d0SVlad Yasevich 2078730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2079730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2080730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2081730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2082730fc3d0SVlad Yasevich */ 20837ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 20847ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2085730fc3d0SVlad Yasevich chunk, err_chunk); 20867ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 20877ab90804SVlad Yasevich } 2088730fc3d0SVlad Yasevich break; 2089730fc3d0SVlad Yasevich 2090730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 209172da7b38SWei Yongjun if (!sctp_auth_enable) 209272da7b38SWei Yongjun goto fallthrough; 209372da7b38SWei Yongjun 209472da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 209572da7b38SWei Yongjun n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; 209672da7b38SWei Yongjun 209772da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 209872da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 209972da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 210072da7b38SWei Yongjun */ 210172da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 210272da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 210372da7b38SWei Yongjun 210472da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2105730fc3d0SVlad Yasevich break; 210672da7b38SWei Yongjun } 210772da7b38SWei Yongjun 210872da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 210972da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 211072da7b38SWei Yongjun err_chunk); 211172da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 211272da7b38SWei Yongjun } 211372da7b38SWei Yongjun break; 2114730fc3d0SVlad Yasevich fallthrough: 21151da177e4SLinus Torvalds default: 21161da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n", 21171da177e4SLinus Torvalds ntohs(param.p->type), cid); 21187ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 21191da177e4SLinus Torvalds break; 21201da177e4SLinus Torvalds } 21211da177e4SLinus Torvalds return retval; 21221da177e4SLinus Torvalds } 21231da177e4SLinus Torvalds 21241da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 21251da177e4SLinus Torvalds int sctp_verify_init(const struct sctp_association *asoc, 21261da177e4SLinus Torvalds sctp_cid_t cid, 21271da177e4SLinus Torvalds sctp_init_chunk_t *peer_init, 21281da177e4SLinus Torvalds struct sctp_chunk *chunk, 21291da177e4SLinus Torvalds struct sctp_chunk **errp) 21301da177e4SLinus Torvalds { 21311da177e4SLinus Torvalds union sctp_params param; 21321da177e4SLinus Torvalds int has_cookie = 0; 21337ab90804SVlad Yasevich int result; 21341da177e4SLinus Torvalds 21351da177e4SLinus Torvalds /* Verify stream values are non-zero. */ 21361da177e4SLinus Torvalds if ((0 == peer_init->init_hdr.num_outbound_streams) || 2137d023f629SVlad Yasevich (0 == peer_init->init_hdr.num_inbound_streams) || 2138d023f629SVlad Yasevich (0 == peer_init->init_hdr.init_tag) || 2139d023f629SVlad Yasevich (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) { 21401da177e4SLinus Torvalds 21417ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 21421da177e4SLinus Torvalds } 21431da177e4SLinus Torvalds 21441da177e4SLinus Torvalds /* Check for missing mandatory parameters. */ 21451da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 21461da177e4SLinus Torvalds 21471da177e4SLinus Torvalds if (SCTP_PARAM_STATE_COOKIE == param.p->type) 21481da177e4SLinus Torvalds has_cookie = 1; 21491da177e4SLinus Torvalds 21501da177e4SLinus Torvalds } /* for (loop through all parameters) */ 21511da177e4SLinus Torvalds 21521da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 21531da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 21541da177e4SLinus Torvalds * The current param.p would point at the bad one. 21551da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 21561da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 21571da177e4SLinus Torvalds * error handling code build and send the packet. 21581da177e4SLinus Torvalds */ 21597ab90804SVlad Yasevich if (param.v != (void*)chunk->chunk_end) 21607ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 21611da177e4SLinus Torvalds 21621da177e4SLinus Torvalds /* The only missing mandatory param possible today is 21631da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 21641da177e4SLinus Torvalds */ 21657ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 21667ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 21671da177e4SLinus Torvalds chunk, errp); 21681da177e4SLinus Torvalds 21697ab90804SVlad Yasevich /* Verify all the variable length parameters */ 21701da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 21711da177e4SLinus Torvalds 21727ab90804SVlad Yasevich result = sctp_verify_param(asoc, param, cid, chunk, errp); 21737ab90804SVlad Yasevich switch (result) { 21747ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 21757ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 21761da177e4SLinus Torvalds return 0; 21777ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 21781da177e4SLinus Torvalds return 1; 21797ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 21807ab90804SVlad Yasevich default: 21817ab90804SVlad Yasevich break; 21821da177e4SLinus Torvalds } 21831da177e4SLinus Torvalds 21841da177e4SLinus Torvalds } /* for (loop through all parameters) */ 21851da177e4SLinus Torvalds 21861da177e4SLinus Torvalds return 1; 21871da177e4SLinus Torvalds } 21881da177e4SLinus Torvalds 21891da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 21901da177e4SLinus Torvalds * Returns 0 on failure, else success. 21911da177e4SLinus Torvalds * FIXME: This is an association method. 21921da177e4SLinus Torvalds */ 21931da177e4SLinus Torvalds int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid, 21941da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2195dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 21961da177e4SLinus Torvalds { 21971da177e4SLinus Torvalds union sctp_params param; 21981da177e4SLinus Torvalds struct sctp_transport *transport; 21991da177e4SLinus Torvalds struct list_head *pos, *temp; 22001da177e4SLinus Torvalds char *cookie; 22011da177e4SLinus Torvalds 22021da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 22031da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 22041da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 22051da177e4SLinus Torvalds * of the INIT from the cookie. 22061da177e4SLinus Torvalds */ 22071da177e4SLinus Torvalds 22081da177e4SLinus Torvalds /* This implementation defaults to making the first transport 22091da177e4SLinus Torvalds * added as the primary transport. The source address seems to 22101da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 22111da177e4SLinus Torvalds */ 22124bdf4b5fSAl Viro if (peer_addr) { 22136a1e5f33SAl Viro if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 22141da177e4SLinus Torvalds goto nomem; 22154bdf4b5fSAl Viro } 22161da177e4SLinus Torvalds 22171da177e4SLinus Torvalds /* Process the initialization parameters. */ 22181da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22191da177e4SLinus Torvalds 22201da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 22211da177e4SLinus Torvalds goto clean_up; 22221da177e4SLinus Torvalds } 22231da177e4SLinus Torvalds 2224730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2225730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2226730fc3d0SVlad Yasevich */ 2227730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2228730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2229730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2230730fc3d0SVlad Yasevich 2231d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2232d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2233d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2234d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2235d6701191SVlad Yasevich * is what we'll do here. 22366b2f9cb6SVlad Yasevich */ 223773d9c4fdSVlad Yasevich if (!sctp_addip_noauth && 223873d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 22396b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 22406b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 22416b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 224288799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2243d6701191SVlad Yasevich goto clean_up; 22446b2f9cb6SVlad Yasevich } 22456b2f9cb6SVlad Yasevich 22463f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 22473f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 22483f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 22493f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 22503f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 22513f7a87d2SFrank Filz } 22523f7a87d2SFrank Filz } 22533f7a87d2SFrank Filz 22541da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 22551da177e4SLinus Torvalds * order. 22561da177e4SLinus Torvalds */ 22571da177e4SLinus Torvalds asoc->peer.i.init_tag = 22581da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 22591da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 22601da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 22611da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 22621da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 22631da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 22641da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 22651da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 22661da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 22671da177e4SLinus Torvalds 22681da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 22691da177e4SLinus Torvalds * number of inbound streams. 22701da177e4SLinus Torvalds */ 22711da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 22721da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 22731da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 22741da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 22751da177e4SLinus Torvalds } 22761da177e4SLinus Torvalds 22771da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 22781da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 22791da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 22801da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 22811da177e4SLinus Torvalds } 22821da177e4SLinus Torvalds 22831da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 22841da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 22851da177e4SLinus Torvalds 22861da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 22871da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 22881da177e4SLinus Torvalds 22891da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 22901da177e4SLinus Torvalds cookie = asoc->peer.cookie; 22911da177e4SLinus Torvalds if (cookie) { 2292af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 22931da177e4SLinus Torvalds if (!asoc->peer.cookie) 22941da177e4SLinus Torvalds goto clean_up; 22951da177e4SLinus Torvalds } 22961da177e4SLinus Torvalds 22971da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 22981da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 22991da177e4SLinus Torvalds * advertised window). 23001da177e4SLinus Torvalds */ 23019dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 23029dbc15f0SRobert P. J. Day transports) { 23031da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 23041da177e4SLinus Torvalds } 23051da177e4SLinus Torvalds 23061da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 23078e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 23088e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 23098e1ee18cSVlad Yasevich goto clean_up; 23101da177e4SLinus Torvalds 23111da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 23121da177e4SLinus Torvalds * 23131da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 23141da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 23151da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 23161da177e4SLinus Torvalds * stream sequence number shall be set to 0. 23171da177e4SLinus Torvalds */ 23181da177e4SLinus Torvalds 23193f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 23203f7a87d2SFrank Filz * association. 23211da177e4SLinus Torvalds */ 23221da177e4SLinus Torvalds if (!asoc->temp) { 23231da177e4SLinus Torvalds int error; 23241da177e4SLinus Torvalds 23251da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 23261da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 23271da177e4SLinus Torvalds if (!asoc->ssnmap) 23281da177e4SLinus Torvalds goto clean_up; 23291da177e4SLinus Torvalds 233007d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 233107d93967SVlad Yasevich if (error) 23321da177e4SLinus Torvalds goto clean_up; 23331da177e4SLinus Torvalds } 23341da177e4SLinus Torvalds 23351da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 23361da177e4SLinus Torvalds * 23371da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 23381da177e4SLinus Torvalds * remote endpoint it should do the following: 23391da177e4SLinus Torvalds * ... 23401da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 23411da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 23421da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 23431da177e4SLinus Torvalds * association to the same value as the Initial TSN. 23441da177e4SLinus Torvalds */ 23451da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 23461da177e4SLinus Torvalds return 1; 23471da177e4SLinus Torvalds 23481da177e4SLinus Torvalds clean_up: 23491da177e4SLinus Torvalds /* Release the transport structures. */ 23501da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23511da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2352add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2353add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 23541da177e4SLinus Torvalds } 23553f7a87d2SFrank Filz 23561da177e4SLinus Torvalds nomem: 23571da177e4SLinus Torvalds return 0; 23581da177e4SLinus Torvalds } 23591da177e4SLinus Torvalds 23601da177e4SLinus Torvalds 23611da177e4SLinus Torvalds /* Update asoc with the option described in param. 23621da177e4SLinus Torvalds * 23631da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 23641da177e4SLinus Torvalds * 23651da177e4SLinus Torvalds * asoc is the association to update. 23661da177e4SLinus Torvalds * param is the variable length parameter to use for update. 23671da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 23681da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 23691da177e4SLinus Torvalds * work we do. In particular, we should not build transport 23701da177e4SLinus Torvalds * structures for the addresses. 23711da177e4SLinus Torvalds */ 23721da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 23731da177e4SLinus Torvalds union sctp_params param, 23741da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2375dd0fc66fSAl Viro gfp_t gfp) 23761da177e4SLinus Torvalds { 23771da177e4SLinus Torvalds union sctp_addr addr; 23781da177e4SLinus Torvalds int i; 23791da177e4SLinus Torvalds __u16 sat; 23801da177e4SLinus Torvalds int retval = 1; 23811da177e4SLinus Torvalds sctp_scope_t scope; 23821da177e4SLinus Torvalds time_t stale; 23831da177e4SLinus Torvalds struct sctp_af *af; 2384d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2385d6de3097SVlad Yasevich struct sctp_transport *t; 23861da177e4SLinus Torvalds 23871da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 23881da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 23891da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 23901da177e4SLinus Torvalds */ 23911da177e4SLinus Torvalds switch (param.p->type) { 23921da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 23931da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 23941da177e4SLinus Torvalds break; 23957dab83deSVlad Yasevich goto do_addr_param; 23967dab83deSVlad Yasevich 23971da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 23987dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 23997dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 24007dab83deSVlad Yasevich break; 24017dab83deSVlad Yasevich do_addr_param: 24021da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2403dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 24041da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2405dd86d136SAl Viro if (sctp_in_scope(&addr, scope)) 2406dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 24071da177e4SLinus Torvalds return 0; 24081da177e4SLinus Torvalds break; 24091da177e4SLinus Torvalds 24101da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 24111da177e4SLinus Torvalds if (!sctp_cookie_preserve_enable) 24121da177e4SLinus Torvalds break; 24131da177e4SLinus Torvalds 24141da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 24151da177e4SLinus Torvalds 24161da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 24171da177e4SLinus Torvalds * (1/1000sec). 24181da177e4SLinus Torvalds */ 24191da177e4SLinus Torvalds asoc->cookie_life.tv_sec += stale / 1000; 24201da177e4SLinus Torvalds asoc->cookie_life.tv_usec += (stale % 1000) * 1000; 24211da177e4SLinus Torvalds break; 24221da177e4SLinus Torvalds 24231da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 24241da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n"); 24251da177e4SLinus Torvalds break; 24261da177e4SLinus Torvalds 24271da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 24281da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 24291da177e4SLinus Torvalds * ones are really set by the peer. 24301da177e4SLinus Torvalds */ 24311da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 24321da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 24331da177e4SLinus Torvalds 2434140ee960SGui Jianfeng /* Assume that peer supports the address family 2435140ee960SGui Jianfeng * by which it sends a packet. 2436140ee960SGui Jianfeng */ 2437140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2438140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2439140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2440140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2441140ee960SGui Jianfeng 24421da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 24431da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 24441da177e4SLinus Torvalds if (sat) 24451da177e4SLinus Torvalds sat /= sizeof(__u16); 24461da177e4SLinus Torvalds 24471da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 24481da177e4SLinus Torvalds switch (param.sat->types[i]) { 24491da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 24501da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 24511da177e4SLinus Torvalds break; 24521da177e4SLinus Torvalds 24531da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 24546e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 24551da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 24561da177e4SLinus Torvalds break; 24571da177e4SLinus Torvalds 24581da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 24591da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 24601da177e4SLinus Torvalds break; 24611da177e4SLinus Torvalds 24621da177e4SLinus Torvalds default: /* Just ignore anything else. */ 24631da177e4SLinus Torvalds break; 24643ff50b79SStephen Hemminger } 24651da177e4SLinus Torvalds } 24661da177e4SLinus Torvalds break; 24671da177e4SLinus Torvalds 24681da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 24691da177e4SLinus Torvalds asoc->peer.cookie_len = 24701da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 24711da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 24721da177e4SLinus Torvalds break; 24731da177e4SLinus Torvalds 24741da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 24751da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 24761da177e4SLinus Torvalds break; 24771da177e4SLinus Torvalds 24781da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 24791da177e4SLinus Torvalds /* Rejected during verify stage. */ 24801da177e4SLinus Torvalds break; 24811da177e4SLinus Torvalds 24821da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 24831da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 24841da177e4SLinus Torvalds break; 24851da177e4SLinus Torvalds 24860f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2487e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 24881da177e4SLinus Torvalds break; 24891da177e4SLinus Torvalds 2490d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 24910ef46e28SVlad Yasevich if (!sctp_addip_enable) 24920ef46e28SVlad Yasevich goto fall_through; 24930ef46e28SVlad Yasevich 2494d6de3097SVlad Yasevich addr_param = param.v + sizeof(sctp_addip_param_t); 2495d6de3097SVlad Yasevich 2496d6de3097SVlad Yasevich af = sctp_get_af_specific(param_type2af(param.p->type)); 2497d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2498d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2499d6de3097SVlad Yasevich 2500d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2501d6de3097SVlad Yasevich * XXX: see spec for what to do. 2502d6de3097SVlad Yasevich */ 2503d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2504d6de3097SVlad Yasevich break; 2505d6de3097SVlad Yasevich 2506d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2507d6de3097SVlad Yasevich if (!t) 2508d6de3097SVlad Yasevich break; 2509d6de3097SVlad Yasevich 2510d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2511d6de3097SVlad Yasevich break; 2512d6de3097SVlad Yasevich 2513131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2514131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2515131a47e3SVlad Yasevich break; 2516131a47e3SVlad Yasevich 25171da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 25181da177e4SLinus Torvalds if (sctp_prsctp_enable) { 25191da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 25201da177e4SLinus Torvalds break; 25211da177e4SLinus Torvalds } 25221da177e4SLinus Torvalds /* Fall Through */ 2523730fc3d0SVlad Yasevich goto fall_through; 2524730fc3d0SVlad Yasevich 2525730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2526730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2527730fc3d0SVlad Yasevich goto fall_through; 2528730fc3d0SVlad Yasevich 2529730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2530730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2531730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2532730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2533730fc3d0SVlad Yasevich retval = 0; 2534730fc3d0SVlad Yasevich break; 2535730fc3d0SVlad Yasevich } 2536730fc3d0SVlad Yasevich break; 2537730fc3d0SVlad Yasevich 2538730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2539730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2540730fc3d0SVlad Yasevich goto fall_through; 2541730fc3d0SVlad Yasevich 2542730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2543730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2544730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2545730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2546730fc3d0SVlad Yasevich retval = 0; 2547730fc3d0SVlad Yasevich break; 2548730fc3d0SVlad Yasevich } 2549730fc3d0SVlad Yasevich 2550730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2551730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2552730fc3d0SVlad Yasevich break; 2553730fc3d0SVlad Yasevich 2554730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2555730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2556730fc3d0SVlad Yasevich goto fall_through; 2557730fc3d0SVlad Yasevich 2558730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2559730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2560730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2561730fc3d0SVlad Yasevich retval = 0; 2562730fc3d0SVlad Yasevich break; 2563730fc3d0SVlad Yasevich fall_through: 25641da177e4SLinus Torvalds default: 25651da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 25661da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 25671da177e4SLinus Torvalds * called prior to this routine. Simply log the error 25681da177e4SLinus Torvalds * here. 25691da177e4SLinus Torvalds */ 25701da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n", 25711da177e4SLinus Torvalds ntohs(param.p->type), asoc); 25721da177e4SLinus Torvalds break; 25733ff50b79SStephen Hemminger } 25741da177e4SLinus Torvalds 25751da177e4SLinus Torvalds return retval; 25761da177e4SLinus Torvalds } 25771da177e4SLinus Torvalds 25781da177e4SLinus Torvalds /* Select a new verification tag. */ 25791da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 25801da177e4SLinus Torvalds { 25811da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 25821da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 25831da177e4SLinus Torvalds */ 25841da177e4SLinus Torvalds __u32 x; 25851da177e4SLinus Torvalds 25861da177e4SLinus Torvalds do { 25871da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 25881da177e4SLinus Torvalds } while (x == 0); 25891da177e4SLinus Torvalds 25901da177e4SLinus Torvalds return x; 25911da177e4SLinus Torvalds } 25921da177e4SLinus Torvalds 25931da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 25941da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 25951da177e4SLinus Torvalds { 25961da177e4SLinus Torvalds __u32 retval; 25971da177e4SLinus Torvalds 25981da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 25991da177e4SLinus Torvalds return retval; 26001da177e4SLinus Torvalds } 26011da177e4SLinus Torvalds 26021da177e4SLinus Torvalds /* 26031da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 26041da177e4SLinus Torvalds * 0 1 2 3 26051da177e4SLinus 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 26061da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26071da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 26081da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26091da177e4SLinus Torvalds * | Serial Number | 26101da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26111da177e4SLinus Torvalds * | Address Parameter | 26121da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26131da177e4SLinus Torvalds * | ASCONF Parameter #1 | 26141da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26151da177e4SLinus Torvalds * \ \ 26161da177e4SLinus Torvalds * / .... / 26171da177e4SLinus Torvalds * \ \ 26181da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26191da177e4SLinus Torvalds * | ASCONF Parameter #N | 26201da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26211da177e4SLinus Torvalds * 26221da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 26231da177e4SLinus Torvalds */ 26241da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 26251da177e4SLinus Torvalds union sctp_addr *addr, 26261da177e4SLinus Torvalds int vparam_len) 26271da177e4SLinus Torvalds { 26281da177e4SLinus Torvalds sctp_addiphdr_t asconf; 26291da177e4SLinus Torvalds struct sctp_chunk *retval; 26301da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 26311da177e4SLinus Torvalds union sctp_addr_param addrparam; 26321da177e4SLinus Torvalds int addrlen; 26331da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 26341da177e4SLinus Torvalds 26351da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 26361da177e4SLinus Torvalds if (!addrlen) 26371da177e4SLinus Torvalds return NULL; 26381da177e4SLinus Torvalds length += addrlen; 26391da177e4SLinus Torvalds 26401da177e4SLinus Torvalds /* Create the chunk. */ 26411da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length); 26421da177e4SLinus Torvalds if (!retval) 26431da177e4SLinus Torvalds return NULL; 26441da177e4SLinus Torvalds 26451da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 26461da177e4SLinus Torvalds 26471da177e4SLinus Torvalds retval->subh.addip_hdr = 26481da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 26491da177e4SLinus Torvalds retval->param_hdr.v = 26501da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 26511da177e4SLinus Torvalds 26521da177e4SLinus Torvalds return retval; 26531da177e4SLinus Torvalds } 26541da177e4SLinus Torvalds 26551da177e4SLinus Torvalds /* ADDIP 26561da177e4SLinus Torvalds * 3.2.1 Add IP Address 26571da177e4SLinus Torvalds * 0 1 2 3 26581da177e4SLinus 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 26591da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26601da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 26611da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26621da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 26631da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26641da177e4SLinus Torvalds * | Address Parameter | 26651da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26661da177e4SLinus Torvalds * 26671da177e4SLinus Torvalds * 3.2.2 Delete IP Address 26681da177e4SLinus Torvalds * 0 1 2 3 26691da177e4SLinus 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 26701da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26711da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 26721da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26731da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 26741da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26751da177e4SLinus Torvalds * | Address Parameter | 26761da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26771da177e4SLinus Torvalds * 26781da177e4SLinus Torvalds */ 26791da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 26801da177e4SLinus Torvalds union sctp_addr *laddr, 26811da177e4SLinus Torvalds struct sockaddr *addrs, 26821da177e4SLinus Torvalds int addrcnt, 2683dbc16db1SAl Viro __be16 flags) 26841da177e4SLinus Torvalds { 26851da177e4SLinus Torvalds sctp_addip_param_t param; 26861da177e4SLinus Torvalds struct sctp_chunk *retval; 26871da177e4SLinus Torvalds union sctp_addr_param addr_param; 26881da177e4SLinus Torvalds union sctp_addr *addr; 26891da177e4SLinus Torvalds void *addr_buf; 26901da177e4SLinus Torvalds struct sctp_af *af; 26911da177e4SLinus Torvalds int paramlen = sizeof(param); 26921da177e4SLinus Torvalds int addr_param_len = 0; 26931da177e4SLinus Torvalds int totallen = 0; 26941da177e4SLinus Torvalds int i; 26951da177e4SLinus Torvalds 26961da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 26971da177e4SLinus Torvalds addr_buf = addrs; 26981da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 26991da177e4SLinus Torvalds addr = (union sctp_addr *)addr_buf; 27001da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 27011da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 27021da177e4SLinus Torvalds 27031da177e4SLinus Torvalds totallen += paramlen; 27041da177e4SLinus Torvalds totallen += addr_param_len; 27051da177e4SLinus Torvalds 27061da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 27071da177e4SLinus Torvalds } 27081da177e4SLinus Torvalds 27091da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 27101da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 27111da177e4SLinus Torvalds if (!retval) 27121da177e4SLinus Torvalds return NULL; 27131da177e4SLinus Torvalds 27141da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 27151da177e4SLinus Torvalds addr_buf = addrs; 27161da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 27171da177e4SLinus Torvalds addr = (union sctp_addr *)addr_buf; 27181da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 27191da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 27201da177e4SLinus Torvalds param.param_hdr.type = flags; 27211da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 27221da177e4SLinus Torvalds param.crr_id = i; 27231da177e4SLinus Torvalds 27241da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 27251da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 27261da177e4SLinus Torvalds 27271da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 27281da177e4SLinus Torvalds } 27291da177e4SLinus Torvalds return retval; 27301da177e4SLinus Torvalds } 27311da177e4SLinus Torvalds 27321da177e4SLinus Torvalds /* ADDIP 27331da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 27341da177e4SLinus Torvalds * 0 1 2 3 27351da177e4SLinus 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 27361da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27371da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 27381da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27391da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27401da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27411da177e4SLinus Torvalds * | Address Parameter | 27421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27431da177e4SLinus Torvalds * 27441da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 27451da177e4SLinus Torvalds */ 27461da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 27471da177e4SLinus Torvalds union sctp_addr *addr) 27481da177e4SLinus Torvalds { 27491da177e4SLinus Torvalds sctp_addip_param_t param; 27501da177e4SLinus Torvalds struct sctp_chunk *retval; 27511da177e4SLinus Torvalds int len = sizeof(param); 27521da177e4SLinus Torvalds union sctp_addr_param addrparam; 27531da177e4SLinus Torvalds int addrlen; 27541da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27551da177e4SLinus Torvalds 27561da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27571da177e4SLinus Torvalds if (!addrlen) 27581da177e4SLinus Torvalds return NULL; 27591da177e4SLinus Torvalds len += addrlen; 27601da177e4SLinus Torvalds 27611da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 27621da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 27631da177e4SLinus Torvalds if (!retval) 27641da177e4SLinus Torvalds return NULL; 27651da177e4SLinus Torvalds 27661da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 27671da177e4SLinus Torvalds param.param_hdr.length = htons(len); 27681da177e4SLinus Torvalds param.crr_id = 0; 27691da177e4SLinus Torvalds 27701da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 27711da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27721da177e4SLinus Torvalds 27731da177e4SLinus Torvalds return retval; 27741da177e4SLinus Torvalds } 27751da177e4SLinus Torvalds 27761da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 27771da177e4SLinus Torvalds * 0 1 2 3 27781da177e4SLinus 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 27791da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27801da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 27811da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27821da177e4SLinus Torvalds * | Serial Number | 27831da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27841da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 27851da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27861da177e4SLinus Torvalds * \ \ 27871da177e4SLinus Torvalds * / .... / 27881da177e4SLinus Torvalds * \ \ 27891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27901da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 27911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27921da177e4SLinus Torvalds * 27931da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 27941da177e4SLinus Torvalds */ 27951da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 27961da177e4SLinus Torvalds __u32 serial, int vparam_len) 27971da177e4SLinus Torvalds { 27981da177e4SLinus Torvalds sctp_addiphdr_t asconf; 27991da177e4SLinus Torvalds struct sctp_chunk *retval; 28001da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 28011da177e4SLinus Torvalds 28021da177e4SLinus Torvalds /* Create the chunk. */ 28031da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length); 28041da177e4SLinus Torvalds if (!retval) 28051da177e4SLinus Torvalds return NULL; 28061da177e4SLinus Torvalds 28071da177e4SLinus Torvalds asconf.serial = htonl(serial); 28081da177e4SLinus Torvalds 28091da177e4SLinus Torvalds retval->subh.addip_hdr = 28101da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 28111da177e4SLinus Torvalds 28121da177e4SLinus Torvalds return retval; 28131da177e4SLinus Torvalds } 28141da177e4SLinus Torvalds 28151da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 28169f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2817dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 28181da177e4SLinus Torvalds { 28191da177e4SLinus Torvalds sctp_addip_param_t ack_param; 28201da177e4SLinus Torvalds sctp_errhdr_t err_param; 28211da177e4SLinus Torvalds int asconf_param_len = 0; 28221da177e4SLinus Torvalds int err_param_len = 0; 2823dbc16db1SAl Viro __be16 response_type; 28241da177e4SLinus Torvalds 28251da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 28261da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 28271da177e4SLinus Torvalds } else { 28281da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 28291da177e4SLinus Torvalds err_param_len = sizeof(err_param); 28301da177e4SLinus Torvalds if (asconf_param) 28311da177e4SLinus Torvalds asconf_param_len = 28321da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 28331da177e4SLinus Torvalds } 28341da177e4SLinus Torvalds 28351da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 28361da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 28371da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 28381da177e4SLinus Torvalds err_param_len + 28391da177e4SLinus Torvalds asconf_param_len); 28401da177e4SLinus Torvalds ack_param.crr_id = crr_id; 28411da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 28421da177e4SLinus Torvalds 28431da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 28441da177e4SLinus Torvalds return; 28451da177e4SLinus Torvalds 28461da177e4SLinus Torvalds /* Add Error Cause parameter. */ 28471da177e4SLinus Torvalds err_param.cause = err_code; 28481da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 28491da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 28501da177e4SLinus Torvalds 28511da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 28521da177e4SLinus Torvalds if (asconf_param) 28531da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 28541da177e4SLinus Torvalds } 28551da177e4SLinus Torvalds 28561da177e4SLinus Torvalds /* Process a asconf parameter. */ 2857dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 28581da177e4SLinus Torvalds struct sctp_chunk *asconf, 28591da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 28601da177e4SLinus Torvalds { 28611da177e4SLinus Torvalds struct sctp_transport *peer; 28621da177e4SLinus Torvalds struct sctp_af *af; 28631da177e4SLinus Torvalds union sctp_addr addr; 28641da177e4SLinus Torvalds union sctp_addr_param *addr_param; 28651da177e4SLinus Torvalds 2866c1cc678aSPatrick McHardy addr_param = (union sctp_addr_param *) 2867c1cc678aSPatrick McHardy ((void *)asconf_param + sizeof(sctp_addip_param_t)); 2868c1cc678aSPatrick McHardy 286944e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 287044e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 287144e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 287244e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 287344e65c1eSWei Yongjun 2874c4492586SWei Yongjun switch (addr_param->v4.param_hdr.type) { 2875c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 2876c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 2877945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 2878c4492586SWei Yongjun break; 2879c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 2880c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 2881945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 2882c4492586SWei Yongjun break; 2883c4492586SWei Yongjun default: 2884945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 2885c4492586SWei Yongjun } 2886c4492586SWei Yongjun 28871da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); 28881da177e4SLinus Torvalds if (unlikely(!af)) 2889945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 28901da177e4SLinus Torvalds 2891dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 289242e30bf3SVlad Yasevich 289342e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 289442e30bf3SVlad Yasevich * or multicast address. 289542e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 289642e30bf3SVlad Yasevich * make sure we check for that) 289742e30bf3SVlad Yasevich */ 289842e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 2899945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 290042e30bf3SVlad Yasevich 29011da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 29021da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 290342e30bf3SVlad Yasevich /* Section 4.2.1: 290442e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 290542e30bf3SVlad Yasevich * address of the packet MUST be added. 290642e30bf3SVlad Yasevich */ 290742e30bf3SVlad Yasevich if (af->is_any(&addr)) 290842e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 290942e30bf3SVlad Yasevich 29101da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 29111da177e4SLinus Torvalds * request and does not have the local resources to add this 29121da177e4SLinus Torvalds * new address to the association, it MUST return an Error 29131da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 29141da177e4SLinus Torvalds * Due to Resource Shortage'. 29151da177e4SLinus Torvalds */ 29161da177e4SLinus Torvalds 2917dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 29181da177e4SLinus Torvalds if (!peer) 29191da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 29201da177e4SLinus Torvalds 29211da177e4SLinus Torvalds /* Start the heartbeat timer. */ 29221da177e4SLinus Torvalds if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) 29231da177e4SLinus Torvalds sctp_transport_hold(peer); 29241da177e4SLinus Torvalds break; 29251da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 29261da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 29271da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 29281da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 29291da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 29301da177e4SLinus Torvalds */ 293142e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 29321da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 29331da177e4SLinus Torvalds 29341da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 29351da177e4SLinus Torvalds * address which is also the source address of the IP packet 29361da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 29371da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 29381da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 29391da177e4SLinus Torvalds * Delete Source IP Address' 29401da177e4SLinus Torvalds */ 29416a1e5f33SAl Viro if (sctp_cmp_addr_exact(sctp_source(asconf), &addr)) 29421da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 29431da177e4SLinus Torvalds 294442e30bf3SVlad Yasevich /* Section 4.2.2 294542e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 294642e30bf3SVlad Yasevich * addresses of the peer except the source address of the 294742e30bf3SVlad Yasevich * packet MUST be deleted. 294842e30bf3SVlad Yasevich */ 294942e30bf3SVlad Yasevich if (af->is_any(&addr)) { 295042e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 295142e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 295242e30bf3SVlad Yasevich asconf->transport); 295342e30bf3SVlad Yasevich } else 2954dd86d136SAl Viro sctp_assoc_del_peer(asoc, &addr); 29551da177e4SLinus Torvalds break; 29561da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 295742e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 295842e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 295942e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 296042e30bf3SVlad Yasevich * primary. 296142e30bf3SVlad Yasevich */ 296242e30bf3SVlad Yasevich if (af->is_any(&addr)) 296342e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 296442e30bf3SVlad Yasevich 2965dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 29661da177e4SLinus Torvalds if (!peer) 2967945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 29681da177e4SLinus Torvalds 29691da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 29701da177e4SLinus Torvalds break; 29711da177e4SLinus Torvalds } 29721da177e4SLinus Torvalds 29731da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 29741da177e4SLinus Torvalds } 29751da177e4SLinus Torvalds 29766f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 29776f4c618dSWei Yongjun int sctp_verify_asconf(const struct sctp_association *asoc, 29786f4c618dSWei Yongjun struct sctp_paramhdr *param_hdr, void *chunk_end, 29796f4c618dSWei Yongjun struct sctp_paramhdr **errp) { 29806f4c618dSWei Yongjun sctp_addip_param_t *asconf_param; 29816f4c618dSWei Yongjun union sctp_params param; 29826f4c618dSWei Yongjun int length, plen; 29836f4c618dSWei Yongjun 29846f4c618dSWei Yongjun param.v = (sctp_paramhdr_t *) param_hdr; 29856f4c618dSWei Yongjun while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) { 29866f4c618dSWei Yongjun length = ntohs(param.p->length); 29876f4c618dSWei Yongjun *errp = param.p; 29886f4c618dSWei Yongjun 29896f4c618dSWei Yongjun if (param.v > chunk_end - length || 29906f4c618dSWei Yongjun length < sizeof(sctp_paramhdr_t)) 29916f4c618dSWei Yongjun return 0; 29926f4c618dSWei Yongjun 29936f4c618dSWei Yongjun switch (param.p->type) { 29946f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 29956f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 29966f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 29976f4c618dSWei Yongjun asconf_param = (sctp_addip_param_t *)param.v; 29986f4c618dSWei Yongjun plen = ntohs(asconf_param->param_hdr.length); 29996f4c618dSWei Yongjun if (plen < sizeof(sctp_addip_param_t) + 30006f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 30016f4c618dSWei Yongjun return 0; 30026f4c618dSWei Yongjun break; 30036f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 30046f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 30056f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 30066f4c618dSWei Yongjun return 0; 30076f4c618dSWei Yongjun 30086f4c618dSWei Yongjun break; 30096f4c618dSWei Yongjun default: 30106f4c618dSWei Yongjun break; 30116f4c618dSWei Yongjun } 30126f4c618dSWei Yongjun 30136f4c618dSWei Yongjun param.v += WORD_ROUND(length); 30146f4c618dSWei Yongjun } 30156f4c618dSWei Yongjun 30166f4c618dSWei Yongjun if (param.v != chunk_end) 30176f4c618dSWei Yongjun return 0; 30186f4c618dSWei Yongjun 30196f4c618dSWei Yongjun return 1; 30206f4c618dSWei Yongjun } 30216f4c618dSWei Yongjun 30221da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 30231da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 30241da177e4SLinus Torvalds */ 30251da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 30261da177e4SLinus Torvalds struct sctp_chunk *asconf) 30271da177e4SLinus Torvalds { 30281da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 30291da177e4SLinus Torvalds union sctp_addr_param *addr_param; 30301da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 30311da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 30321da177e4SLinus Torvalds 3033dbc16db1SAl Viro __be16 err_code; 30341da177e4SLinus Torvalds int length = 0; 3035f3830cccSWei Yongjun int chunk_len; 30361da177e4SLinus Torvalds __u32 serial; 30371da177e4SLinus Torvalds int all_param_pass = 1; 30381da177e4SLinus Torvalds 3039f3830cccSWei Yongjun chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); 30401da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 30411da177e4SLinus Torvalds serial = ntohl(hdr->serial); 30421da177e4SLinus Torvalds 30431da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 30441da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 30451da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 30461da177e4SLinus Torvalds chunk_len -= length; 30471da177e4SLinus Torvalds 30481da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 30497aa1b54bSJoe Perches * asconf parameter. 30501da177e4SLinus Torvalds */ 30511da177e4SLinus Torvalds length = ntohs(addr_param->v4.param_hdr.length); 30521da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); 30531da177e4SLinus Torvalds chunk_len -= length; 30541da177e4SLinus Torvalds 30551da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 30561da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 30571da177e4SLinus Torvalds * ASCONF_ACK parameters are less than or equal to the twice of ASCONF 30587aa1b54bSJoe Perches * parameters. 30591da177e4SLinus Torvalds */ 30601da177e4SLinus Torvalds asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2); 30611da177e4SLinus Torvalds if (!asconf_ack) 30621da177e4SLinus Torvalds goto done; 30631da177e4SLinus Torvalds 30641da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 30651da177e4SLinus Torvalds while (chunk_len > 0) { 30661da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 30671da177e4SLinus Torvalds asconf_param); 30681da177e4SLinus Torvalds /* ADDIP 4.1 A7) 30691da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 30701da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 30711da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 30721da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 30731da177e4SLinus Torvalds * a specific success indication is present for the parameter. 30741da177e4SLinus Torvalds */ 30751da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR != err_code) 30761da177e4SLinus Torvalds all_param_pass = 0; 30771da177e4SLinus Torvalds 30781da177e4SLinus Torvalds if (!all_param_pass) 30791da177e4SLinus Torvalds sctp_add_asconf_response(asconf_ack, 30801da177e4SLinus Torvalds asconf_param->crr_id, err_code, 30811da177e4SLinus Torvalds asconf_param); 30821da177e4SLinus Torvalds 30831da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 30841da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 30851da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 30861da177e4SLinus Torvalds * in the ASCONF. 30871da177e4SLinus Torvalds */ 30881da177e4SLinus Torvalds if (SCTP_ERROR_RSRC_LOW == err_code) 30891da177e4SLinus Torvalds goto done; 30901da177e4SLinus Torvalds 30911da177e4SLinus Torvalds /* Move to the next ASCONF param. */ 30921da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 30931da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)asconf_param + 30941da177e4SLinus Torvalds length); 30951da177e4SLinus Torvalds chunk_len -= length; 30961da177e4SLinus Torvalds } 30971da177e4SLinus Torvalds 30981da177e4SLinus Torvalds done: 30991da177e4SLinus Torvalds asoc->peer.addip_serial++; 31001da177e4SLinus Torvalds 31011da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 31021da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 31031da177e4SLinus Torvalds */ 31041da177e4SLinus Torvalds if (asconf_ack) { 31051da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3106a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3107a08de64dSVlad Yasevich &asoc->asconf_ack_list); 31081da177e4SLinus Torvalds } 31091da177e4SLinus Torvalds 31101da177e4SLinus Torvalds return asconf_ack; 31111da177e4SLinus Torvalds } 31121da177e4SLinus Torvalds 31131da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3114425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 31151da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 31161da177e4SLinus Torvalds { 31171da177e4SLinus Torvalds struct sctp_af *af; 31181da177e4SLinus Torvalds union sctp_addr addr; 31191da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 31201da177e4SLinus Torvalds union sctp_addr_param *addr_param; 31211da177e4SLinus Torvalds struct sctp_transport *transport; 3122dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 31231da177e4SLinus Torvalds 31241da177e4SLinus Torvalds addr_param = (union sctp_addr_param *) 31251da177e4SLinus Torvalds ((void *)asconf_param + sizeof(sctp_addip_param_t)); 31261da177e4SLinus Torvalds 31271da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 31281da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); 3129dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 31301da177e4SLinus Torvalds 31311da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 31321da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3133559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3134559cf710SVlad Yasevich * held, so the list can not change. 3135559cf710SVlad Yasevich */ 31360ed90fb0SVlad Yasevich local_bh_disable(); 3137559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3138dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3139f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3140dc022a98SSridhar Samudrala } 31410ed90fb0SVlad Yasevich local_bh_enable(); 31423cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 31433cd9749cSWei Yongjun transports) { 31443cd9749cSWei Yongjun if (transport->state == SCTP_ACTIVE) 31453cd9749cSWei Yongjun continue; 31463cd9749cSWei Yongjun dst_release(transport->dst); 31473cd9749cSWei Yongjun sctp_transport_route(transport, NULL, 31483cd9749cSWei Yongjun sctp_sk(asoc->base.sk)); 31493cd9749cSWei Yongjun } 31501da177e4SLinus Torvalds break; 31511da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 31520ed90fb0SVlad Yasevich local_bh_disable(); 3153425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 31540ed90fb0SVlad Yasevich local_bh_enable(); 31559dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 31569dbc15f0SRobert P. J. Day transports) { 3157dc022a98SSridhar Samudrala dst_release(transport->dst); 31581da177e4SLinus Torvalds sctp_transport_route(transport, NULL, 31591da177e4SLinus Torvalds sctp_sk(asoc->base.sk)); 31601da177e4SLinus Torvalds } 31611da177e4SLinus Torvalds break; 31621da177e4SLinus Torvalds default: 31631da177e4SLinus Torvalds break; 31641da177e4SLinus Torvalds } 31651da177e4SLinus Torvalds } 31661da177e4SLinus Torvalds 31671da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 31681da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 31691da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 31701da177e4SLinus Torvalds * ADDIP 4.1 31711da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 31721da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 31731da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 31741da177e4SLinus Torvalds * specific success indication is present for the parameter. 31751da177e4SLinus Torvalds */ 3176dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 31771da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 31781da177e4SLinus Torvalds int no_err) 31791da177e4SLinus Torvalds { 31801da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 31811da177e4SLinus Torvalds sctp_errhdr_t *err_param; 31821da177e4SLinus Torvalds int length; 3183f3830cccSWei Yongjun int asconf_ack_len; 3184dbc16db1SAl Viro __be16 err_code; 31851da177e4SLinus Torvalds 31861da177e4SLinus Torvalds if (no_err) 31871da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 31881da177e4SLinus Torvalds else 31891da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 31901da177e4SLinus Torvalds 3191f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3192f3830cccSWei Yongjun sizeof(sctp_chunkhdr_t); 3193f3830cccSWei Yongjun 31941da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 31951da177e4SLinus Torvalds * the first asconf_ack parameter. 31961da177e4SLinus Torvalds */ 31971da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 31981da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 31991da177e4SLinus Torvalds length); 32001da177e4SLinus Torvalds asconf_ack_len -= length; 32011da177e4SLinus Torvalds 32021da177e4SLinus Torvalds while (asconf_ack_len > 0) { 32031da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 32041da177e4SLinus Torvalds switch(asconf_ack_param->param_hdr.type) { 32051da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 32061da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 32071da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 32081da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 32091da177e4SLinus Torvalds err_param = (sctp_errhdr_t *) 32101da177e4SLinus Torvalds ((void *)asconf_ack_param + length); 32111da177e4SLinus Torvalds asconf_ack_len -= length; 32121da177e4SLinus Torvalds if (asconf_ack_len > 0) 32131da177e4SLinus Torvalds return err_param->cause; 32141da177e4SLinus Torvalds else 32151da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 32161da177e4SLinus Torvalds break; 32171da177e4SLinus Torvalds default: 32181da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 32191da177e4SLinus Torvalds } 32201da177e4SLinus Torvalds } 32211da177e4SLinus Torvalds 32221da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 32231da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *) 32241da177e4SLinus Torvalds ((void *)asconf_ack_param + length); 32251da177e4SLinus Torvalds asconf_ack_len -= length; 32261da177e4SLinus Torvalds } 32271da177e4SLinus Torvalds 32281da177e4SLinus Torvalds return err_code; 32291da177e4SLinus Torvalds } 32301da177e4SLinus Torvalds 32311da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 32321da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 32331da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 32341da177e4SLinus Torvalds { 32351da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 32361da177e4SLinus Torvalds union sctp_addr_param *addr_param; 32371da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 32381da177e4SLinus Torvalds int length = 0; 32391da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 32401da177e4SLinus Torvalds int all_param_pass = 0; 32411da177e4SLinus Torvalds int no_err = 1; 32421da177e4SLinus Torvalds int retval = 0; 3243dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 32441da177e4SLinus Torvalds 32451da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 32461da177e4SLinus Torvalds * a pointer to address parameter. 32471da177e4SLinus Torvalds */ 32481da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 32491da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 32501da177e4SLinus Torvalds asconf_len -= length; 32511da177e4SLinus Torvalds 32521da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 32537aa1b54bSJoe Perches * pointer to the first asconf parameter. 32541da177e4SLinus Torvalds */ 32551da177e4SLinus Torvalds length = ntohs(addr_param->v4.param_hdr.length); 32561da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); 32571da177e4SLinus Torvalds asconf_len -= length; 32581da177e4SLinus Torvalds 32591da177e4SLinus Torvalds /* ADDIP 4.1 32601da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 32611da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 32621da177e4SLinus Torvalds * successful. 32631da177e4SLinus Torvalds */ 32641da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 32651da177e4SLinus Torvalds all_param_pass = 1; 32661da177e4SLinus Torvalds 32671da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 32681da177e4SLinus Torvalds while (asconf_len > 0) { 32691da177e4SLinus Torvalds if (all_param_pass) 32701da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 32711da177e4SLinus Torvalds else { 32721da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 32731da177e4SLinus Torvalds asconf_param, 32741da177e4SLinus Torvalds no_err); 32751da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 32761da177e4SLinus Torvalds no_err = 0; 32771da177e4SLinus Torvalds } 32781da177e4SLinus Torvalds 32791da177e4SLinus Torvalds switch (err_code) { 32801da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3281425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 32821da177e4SLinus Torvalds break; 32831da177e4SLinus Torvalds 32841da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 32851da177e4SLinus Torvalds retval = 1; 32861da177e4SLinus Torvalds break; 32871da177e4SLinus Torvalds 3288a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 32891da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 32901da177e4SLinus Torvalds * future. 32911da177e4SLinus Torvalds */ 32921da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 32931da177e4SLinus Torvalds asconf_param->param_hdr.type; 32941da177e4SLinus Torvalds break; 32951da177e4SLinus Torvalds 32961da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 32971da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 32981da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 32991da177e4SLinus Torvalds default: 33001da177e4SLinus Torvalds break; 33011da177e4SLinus Torvalds } 33021da177e4SLinus Torvalds 33031da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 33041da177e4SLinus Torvalds * one. 33051da177e4SLinus Torvalds */ 33061da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 33071da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)asconf_param + 33081da177e4SLinus Torvalds length); 33091da177e4SLinus Torvalds asconf_len -= length; 33101da177e4SLinus Torvalds } 33111da177e4SLinus Torvalds 33121da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 33135f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 33141da177e4SLinus Torvalds sctp_chunk_free(asconf); 33151da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 33161da177e4SLinus Torvalds 33171da177e4SLinus Torvalds /* Send the next asconf chunk from the addip chunk queue. */ 331879af02c2SDavid S. Miller if (!list_empty(&asoc->addip_chunk_list)) { 331979af02c2SDavid S. Miller struct list_head *entry = asoc->addip_chunk_list.next; 332079af02c2SDavid S. Miller asconf = list_entry(entry, struct sctp_chunk, list); 332179af02c2SDavid S. Miller 332279af02c2SDavid S. Miller list_del_init(entry); 332379af02c2SDavid S. Miller 33241da177e4SLinus Torvalds /* Hold the chunk until an ASCONF_ACK is received. */ 33251da177e4SLinus Torvalds sctp_chunk_hold(asconf); 33261da177e4SLinus Torvalds if (sctp_primitive_ASCONF(asoc, asconf)) 33271da177e4SLinus Torvalds sctp_chunk_free(asconf); 33281da177e4SLinus Torvalds else 33291da177e4SLinus Torvalds asoc->addip_last_asconf = asconf; 33301da177e4SLinus Torvalds } 33311da177e4SLinus Torvalds 33321da177e4SLinus Torvalds return retval; 33331da177e4SLinus Torvalds } 33341da177e4SLinus Torvalds 33351da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 33361da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 33371da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 33381da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 33391da177e4SLinus Torvalds { 33401da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 33411da177e4SLinus Torvalds struct sctp_fwdtsn_chunk *ftsn_chunk; 33421da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 33431da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 33441da177e4SLinus Torvalds size_t hint; 33451da177e4SLinus Torvalds int i; 33461da177e4SLinus Torvalds 33471da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 33481da177e4SLinus Torvalds 33491da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint); 33501da177e4SLinus Torvalds 33511da177e4SLinus Torvalds if (!retval) 33521da177e4SLinus Torvalds return NULL; 33531da177e4SLinus Torvalds 33541da177e4SLinus Torvalds ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr; 33551da177e4SLinus Torvalds 33561da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 33571da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 33581da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 33591da177e4SLinus Torvalds 33601da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 33611da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 33621da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 33631da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 33641da177e4SLinus Torvalds } 33651da177e4SLinus Torvalds 33661da177e4SLinus Torvalds return retval; 33671da177e4SLinus Torvalds } 3368