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, 1031da177e4SLinus Torvalds __constant_htons(sizeof(struct sctp_paramhdr)), 1041da177e4SLinus Torvalds }; 1051da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1061da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 1071da177e4SLinus Torvalds __constant_htons(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 2271da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2281da177e4SLinus Torvalds chunksize += vparam_len; 2291da177e4SLinus Torvalds 230730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 231730fc3d0SVlad Yasevich if (sctp_auth_enable) { 232730fc3d0SVlad Yasevich /* Add random parameter length*/ 233730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 234730fc3d0SVlad Yasevich 235730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 236730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 237730fc3d0SVlad Yasevich if (auth_hmacs->length) 238730fc3d0SVlad Yasevich chunksize += ntohs(auth_hmacs->length); 239730fc3d0SVlad Yasevich else 240730fc3d0SVlad Yasevich auth_hmacs = NULL; 241730fc3d0SVlad Yasevich 242730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 243730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 244730fc3d0SVlad Yasevich if (auth_chunks->length) 245730fc3d0SVlad Yasevich chunksize += ntohs(auth_chunks->length); 246730fc3d0SVlad Yasevich else 2479baffaa6SVlad Yasevich auth_chunks = NULL; 248730fc3d0SVlad Yasevich 249730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 250730fc3d0SVlad Yasevich num_ext += 1; 251730fc3d0SVlad Yasevich } 252730fc3d0SVlad Yasevich 253131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 254131a47e3SVlad Yasevich if (num_ext) 255131a47e3SVlad Yasevich chunksize += sizeof(sctp_supported_ext_param_t) + num_ext; 256131a47e3SVlad Yasevich 2571da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2581da177e4SLinus Torvalds * 2591da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 2601da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 2611da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 2621da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 2631da177e4SLinus Torvalds * other address types if the Host Name address parameter is 2641da177e4SLinus Torvalds * present in the received INIT chunk. 2651da177e4SLinus Torvalds * 2661da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 2671da177e4SLinus Torvalds */ 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize); 2701da177e4SLinus Torvalds if (!retval) 2711da177e4SLinus Torvalds goto nodata; 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds retval->subh.init_hdr = 2741da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 2751da177e4SLinus Torvalds retval->param_hdr.v = 2761da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2791da177e4SLinus Torvalds * 2801da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 2811da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 2821da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 2831da177e4SLinus Torvalds * support any address type. 2841da177e4SLinus Torvalds */ 2851da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 2861da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 2871da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 2881da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 291131a47e3SVlad Yasevich 2927aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 293131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 294131a47e3SVlad Yasevich */ 295131a47e3SVlad Yasevich if (num_ext) { 296131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 297131a47e3SVlad Yasevich ext_param.param_hdr.length = 298131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 299131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 300131a47e3SVlad Yasevich &ext_param); 3018ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 302131a47e3SVlad Yasevich } 303131a47e3SVlad Yasevich 3041da177e4SLinus Torvalds if (sctp_prsctp_enable) 3051da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 306131a47e3SVlad Yasevich 3070f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3081da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3090f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3101da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 311131a47e3SVlad Yasevich 312730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 313730fc3d0SVlad Yasevich if (sctp_auth_enable) { 314730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 315730fc3d0SVlad Yasevich asoc->c.auth_random); 316730fc3d0SVlad Yasevich if (auth_hmacs) 317730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 318730fc3d0SVlad Yasevich auth_hmacs); 319730fc3d0SVlad Yasevich if (auth_chunks) 320730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 321730fc3d0SVlad Yasevich auth_chunks); 322730fc3d0SVlad Yasevich } 3231da177e4SLinus Torvalds nodata: 3241da177e4SLinus Torvalds kfree(addrs.v); 3251da177e4SLinus Torvalds return retval; 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3291da177e4SLinus Torvalds const struct sctp_chunk *chunk, 330dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3311da177e4SLinus Torvalds { 3321da177e4SLinus Torvalds sctp_inithdr_t initack; 3331da177e4SLinus Torvalds struct sctp_chunk *retval; 3341da177e4SLinus Torvalds union sctp_params addrs; 3351da177e4SLinus Torvalds int addrs_len; 3361da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3371da177e4SLinus Torvalds int cookie_len; 3381da177e4SLinus Torvalds size_t chunksize; 3390f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 340131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 341131a47e3SVlad Yasevich int num_ext = 0; 342131a47e3SVlad Yasevich __u8 extensions[3]; 343730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 344730fc3d0SVlad Yasevich *auth_hmacs = NULL, 345730fc3d0SVlad Yasevich *auth_random = NULL; 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds retval = NULL; 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 3501da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 3531da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 3541da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 3551da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 3561da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 3591da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 3601da177e4SLinus Torvalds */ 3611da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 3621da177e4SLinus Torvalds addrs.v, addrs_len); 3631da177e4SLinus Torvalds if (!cookie) 3641da177e4SLinus Torvalds goto nomem_cookie; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 3671da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 3681da177e4SLinus Torvalds */ 3691da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 3721da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 3731da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 3741da177e4SLinus Torvalds 375036b579bSVlad Yasevich if (sctp_prsctp_enable) 376036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 377036b579bSVlad Yasevich 378131a47e3SVlad Yasevich if (sctp_addip_enable) { 379131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 380131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 381131a47e3SVlad Yasevich num_ext += 2; 382131a47e3SVlad Yasevich } 383131a47e3SVlad Yasevich 3841da177e4SLinus Torvalds chunksize += sizeof(aiparam); 3851da177e4SLinus Torvalds 386730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 387730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 388730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 389730fc3d0SVlad Yasevich 390730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 391730fc3d0SVlad Yasevich if (auth_hmacs->length) 392730fc3d0SVlad Yasevich chunksize += ntohs(auth_hmacs->length); 393730fc3d0SVlad Yasevich else 394730fc3d0SVlad Yasevich auth_hmacs = NULL; 395730fc3d0SVlad Yasevich 396730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 397730fc3d0SVlad Yasevich if (auth_chunks->length) 398730fc3d0SVlad Yasevich chunksize += ntohs(auth_chunks->length); 399730fc3d0SVlad Yasevich else 400730fc3d0SVlad Yasevich auth_chunks = NULL; 401730fc3d0SVlad Yasevich 402730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 403730fc3d0SVlad Yasevich num_ext += 1; 404730fc3d0SVlad Yasevich } 405730fc3d0SVlad Yasevich 4068ee4be37SVlad Yasevich if (num_ext) 4078ee4be37SVlad Yasevich chunksize += sizeof(sctp_supported_ext_param_t) + num_ext; 4088ee4be37SVlad Yasevich 4091da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 4101da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize); 4111da177e4SLinus Torvalds if (!retval) 4121da177e4SLinus Torvalds goto nomem_chunk; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds /* Per the advice in RFC 2960 6.4, send this reply to 4151da177e4SLinus Torvalds * the source of the INIT packet. 4161da177e4SLinus Torvalds */ 4171da177e4SLinus Torvalds retval->transport = chunk->transport; 4181da177e4SLinus Torvalds retval->subh.init_hdr = 4191da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4201da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4211da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4221da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4231da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 424131a47e3SVlad Yasevich if (num_ext) { 425131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 426131a47e3SVlad Yasevich ext_param.param_hdr.length = 427131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 428131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 429131a47e3SVlad Yasevich &ext_param); 4308ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 431131a47e3SVlad Yasevich } 4321da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 4331da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 4341da177e4SLinus Torvalds 4350f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 4361da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 4370f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sctp_sk(asoc->base.sk)->adaptation_ind); 4381da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 4391da177e4SLinus Torvalds 440730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 441730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 442730fc3d0SVlad Yasevich auth_random); 443730fc3d0SVlad Yasevich if (auth_hmacs) 444730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 445730fc3d0SVlad Yasevich auth_hmacs); 446730fc3d0SVlad Yasevich if (auth_chunks) 447730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 448730fc3d0SVlad Yasevich auth_chunks); 449730fc3d0SVlad Yasevich } 450730fc3d0SVlad Yasevich 4511da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 4521da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 4551da177e4SLinus Torvalds * 4561da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 4571da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 4581da177e4SLinus Torvalds * address from which it received the DATA or control chunk 4591da177e4SLinus Torvalds * to which it is replying. 4601da177e4SLinus Torvalds * 4611da177e4SLinus Torvalds * [INIT ACK back to where the INIT came from.] 4621da177e4SLinus Torvalds */ 4631da177e4SLinus Torvalds if (chunk) 4641da177e4SLinus Torvalds retval->transport = chunk->transport; 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds nomem_chunk: 4671da177e4SLinus Torvalds kfree(cookie); 4681da177e4SLinus Torvalds nomem_cookie: 4691da177e4SLinus Torvalds kfree(addrs.v); 4701da177e4SLinus Torvalds return retval; 4711da177e4SLinus Torvalds } 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 4741da177e4SLinus Torvalds * 4751da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 4761da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 4771da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 4781da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 4791da177e4SLinus Torvalds * chunks in the same packet. 4801da177e4SLinus Torvalds * 4811da177e4SLinus Torvalds * 0 1 2 3 4821da177e4SLinus 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 4831da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4841da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 4851da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4861da177e4SLinus Torvalds * / Cookie / 4871da177e4SLinus Torvalds * \ \ 4881da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4891da177e4SLinus Torvalds * 4901da177e4SLinus Torvalds * Chunk Flags: 8 bit 4911da177e4SLinus Torvalds * 4921da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 4931da177e4SLinus Torvalds * 4941da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 4951da177e4SLinus Torvalds * 4961da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 4971da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 4981da177e4SLinus Torvalds * 4991da177e4SLinus Torvalds * Cookie: variable size 5001da177e4SLinus Torvalds * 5011da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5021da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5031da177e4SLinus Torvalds * 5041da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5051da177e4SLinus Torvalds * to insure interoperability. 5061da177e4SLinus Torvalds */ 5071da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5081da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5091da177e4SLinus Torvalds { 5101da177e4SLinus Torvalds struct sctp_chunk *retval; 5111da177e4SLinus Torvalds void *cookie; 5121da177e4SLinus Torvalds int cookie_len; 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5151da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 5181da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len); 5191da177e4SLinus Torvalds if (!retval) 5201da177e4SLinus Torvalds goto nodata; 5211da177e4SLinus Torvalds retval->subh.cookie_hdr = 5221da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5251da177e4SLinus Torvalds * 5261da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5271da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5281da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5291da177e4SLinus Torvalds * to which it is replying. 5301da177e4SLinus Torvalds * 5311da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5321da177e4SLinus Torvalds */ 5331da177e4SLinus Torvalds if (chunk) 5341da177e4SLinus Torvalds retval->transport = chunk->transport; 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds nodata: 5371da177e4SLinus Torvalds return retval; 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5411da177e4SLinus Torvalds * 5421da177e4SLinus Torvalds * This chunk is used only during the initialization of an 5431da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 5441da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 5451da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 5461da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 5471da177e4SLinus Torvalds * 5481da177e4SLinus Torvalds * 0 1 2 3 5491da177e4SLinus 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 5501da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5511da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 5521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5531da177e4SLinus Torvalds * 5541da177e4SLinus Torvalds * Chunk Flags: 8 bits 5551da177e4SLinus Torvalds * 5561da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5571da177e4SLinus Torvalds */ 5581da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 5591da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5601da177e4SLinus Torvalds { 5611da177e4SLinus Torvalds struct sctp_chunk *retval; 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0); 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5661da177e4SLinus Torvalds * 5671da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5681da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5691da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5701da177e4SLinus Torvalds * to which it is replying. 5711da177e4SLinus Torvalds * 5721da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 5731da177e4SLinus Torvalds */ 5741da177e4SLinus Torvalds if (retval && chunk) 5751da177e4SLinus Torvalds retval->transport = chunk->transport; 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds return retval; 5781da177e4SLinus Torvalds } 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds /* 5811da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 5821da177e4SLinus Torvalds * CWR: 5831da177e4SLinus Torvalds * 5841da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 5851da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 5861da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 5871da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 5881da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 5891da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 5901da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 5911da177e4SLinus Torvalds * CE bit. 5921da177e4SLinus Torvalds * 5931da177e4SLinus Torvalds * 0 1 2 3 5941da177e4SLinus 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 5951da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5961da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 5971da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5981da177e4SLinus Torvalds * | Lowest TSN Number | 5991da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6001da177e4SLinus Torvalds * 6011da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6021da177e4SLinus Torvalds */ 6031da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6041da177e4SLinus Torvalds const __u32 lowest_tsn, 6051da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6061da177e4SLinus Torvalds { 6071da177e4SLinus Torvalds struct sctp_chunk *retval; 6081da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 6111da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0, 6121da177e4SLinus Torvalds sizeof(sctp_cwrhdr_t)); 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds if (!retval) 6151da177e4SLinus Torvalds goto nodata; 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6181da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6211da177e4SLinus Torvalds * 6221da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6231da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6241da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6251da177e4SLinus Torvalds * to which it is replying. 6261da177e4SLinus Torvalds * 6271da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6281da177e4SLinus Torvalds * came from.] 6291da177e4SLinus Torvalds */ 6301da177e4SLinus Torvalds if (chunk) 6311da177e4SLinus Torvalds retval->transport = chunk->transport; 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds nodata: 6341da177e4SLinus Torvalds return retval; 6351da177e4SLinus Torvalds } 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6381da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6391da177e4SLinus Torvalds const __u32 lowest_tsn) 6401da177e4SLinus Torvalds { 6411da177e4SLinus Torvalds struct sctp_chunk *retval; 6421da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 6451da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0, 6461da177e4SLinus Torvalds sizeof(sctp_ecnehdr_t)); 6471da177e4SLinus Torvalds if (!retval) 6481da177e4SLinus Torvalds goto nodata; 6491da177e4SLinus Torvalds retval->subh.ecne_hdr = 6501da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds nodata: 6531da177e4SLinus Torvalds return retval; 6541da177e4SLinus Torvalds } 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 6571da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 6581da177e4SLinus Torvalds */ 6591da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 6601da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 6611da177e4SLinus Torvalds int data_len, __u8 flags, __u16 ssn) 6621da177e4SLinus Torvalds { 6631da177e4SLinus Torvalds struct sctp_chunk *retval; 6641da177e4SLinus Torvalds struct sctp_datahdr dp; 6651da177e4SLinus Torvalds int chunk_len; 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 6681da177e4SLinus Torvalds * creating the chunk. 6691da177e4SLinus Torvalds */ 6701da177e4SLinus Torvalds dp.tsn = 0; 6711da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 6721da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 675eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 6761da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 6771da177e4SLinus Torvalds dp.ssn = 0; 6781da177e4SLinus Torvalds } else 6791da177e4SLinus Torvalds dp.ssn = htons(ssn); 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 6821da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len); 6831da177e4SLinus Torvalds if (!retval) 6841da177e4SLinus Torvalds goto nodata; 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 6871da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds nodata: 6901da177e4SLinus Torvalds return retval; 6911da177e4SLinus Torvalds } 6921da177e4SLinus Torvalds 6931da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 6941da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 6951da177e4SLinus Torvalds * including duplicates and gaps. 6961da177e4SLinus Torvalds */ 6971da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 6981da177e4SLinus Torvalds { 6991da177e4SLinus Torvalds struct sctp_chunk *retval; 7001da177e4SLinus Torvalds struct sctp_sackhdr sack; 7011da177e4SLinus Torvalds int len; 7021da177e4SLinus Torvalds __u32 ctsn; 7031da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7041da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 7071da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn); 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 7101da177e4SLinus Torvalds num_gabs = sctp_tsnmap_num_gabs(map); 7111da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds /* Initialize the SACK header. */ 7141da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7151da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7161da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7171da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds len = sizeof(sack) 7201da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7211da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds /* Create the chunk. */ 7241da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len); 7251da177e4SLinus Torvalds if (!retval) 7261da177e4SLinus Torvalds goto nodata; 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7291da177e4SLinus Torvalds * 7301da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7311da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7321da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7331da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7341da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7351da177e4SLinus Torvalds * reply chunk. 7361da177e4SLinus Torvalds * 7371da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 7381da177e4SLinus Torvalds * in packets from different source addresses in a single 7391da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 7401da177e4SLinus Torvalds * destination transport addresses from which the DATA or 7411da177e4SLinus Torvalds * control chunks being acknowledged were received. 7421da177e4SLinus Torvalds * 7431da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 7441da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 7451da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 7461da177e4SLinus Torvalds * duplicates. --piggy] 7471da177e4SLinus Torvalds * 7481da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 7491da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 7501da177e4SLinus Torvalds * destination address and not use the source address of the 7511da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 7521da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 7531da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 7541da177e4SLinus Torvalds * for the SACK is broken. 7551da177e4SLinus Torvalds * 7561da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 7571da177e4SLinus Torvalds */ 7581da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds retval->subh.sack_hdr = 7611da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 7621da177e4SLinus Torvalds 7631da177e4SLinus Torvalds /* Add the gap ack block information. */ 7641da177e4SLinus Torvalds if (num_gabs) 7651da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 7661da177e4SLinus Torvalds sctp_tsnmap_get_gabs(map)); 7671da177e4SLinus Torvalds 7681da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 7691da177e4SLinus Torvalds if (num_dup_tsns) 7701da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 7711da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds nodata: 7741da177e4SLinus Torvalds return retval; 7751da177e4SLinus Torvalds } 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 7781da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 7791da177e4SLinus Torvalds const struct sctp_chunk *chunk) 7801da177e4SLinus Torvalds { 7811da177e4SLinus Torvalds struct sctp_chunk *retval; 7821da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 7831da177e4SLinus Torvalds __u32 ctsn; 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 7861da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0, 7891da177e4SLinus Torvalds sizeof(sctp_shutdownhdr_t)); 7901da177e4SLinus Torvalds if (!retval) 7911da177e4SLinus Torvalds goto nodata; 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds retval->subh.shutdown_hdr = 7941da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds if (chunk) 7971da177e4SLinus Torvalds retval->transport = chunk->transport; 7981da177e4SLinus Torvalds nodata: 7991da177e4SLinus Torvalds return retval; 8001da177e4SLinus Torvalds } 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8031da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8041da177e4SLinus Torvalds { 8051da177e4SLinus Torvalds struct sctp_chunk *retval; 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0); 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8101da177e4SLinus Torvalds * 8111da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8121da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8131da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8141da177e4SLinus Torvalds * to which it is replying. 8151da177e4SLinus Torvalds * 8161da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8171da177e4SLinus Torvalds */ 8181da177e4SLinus Torvalds if (retval && chunk) 8191da177e4SLinus Torvalds retval->transport = chunk->transport; 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds return retval; 8221da177e4SLinus Torvalds } 8231da177e4SLinus Torvalds 8241da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 8251da177e4SLinus Torvalds const struct sctp_association *asoc, 8261da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8271da177e4SLinus Torvalds { 8281da177e4SLinus Torvalds struct sctp_chunk *retval; 8291da177e4SLinus Torvalds __u8 flags = 0; 8301da177e4SLinus Torvalds 831047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 832047a2428SJerome Forissier * reflected) 833047a2428SJerome Forissier */ 8341da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0); 8371da177e4SLinus Torvalds 8381da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8391da177e4SLinus Torvalds * 8401da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8411da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8421da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8431da177e4SLinus Torvalds * to which it is replying. 8441da177e4SLinus Torvalds * 8451da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 8461da177e4SLinus Torvalds * came from.] 8471da177e4SLinus Torvalds */ 8481da177e4SLinus Torvalds if (retval && chunk) 8491da177e4SLinus Torvalds retval->transport = chunk->transport; 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds return retval; 8521da177e4SLinus Torvalds } 8531da177e4SLinus Torvalds 8541da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 855047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 8561da177e4SLinus Torvalds */ 8571da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 8581da177e4SLinus Torvalds const struct sctp_chunk *chunk, 8591da177e4SLinus Torvalds const size_t hint) 8601da177e4SLinus Torvalds { 8611da177e4SLinus Torvalds struct sctp_chunk *retval; 8621da177e4SLinus Torvalds __u8 flags = 0; 8631da177e4SLinus Torvalds 864047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 865047a2428SJerome Forissier * an INIT (vtag will be reflected). 866047a2428SJerome Forissier */ 867047a2428SJerome Forissier if (!asoc) { 868047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 869047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 870047a2428SJerome Forissier flags = 0; 871047a2428SJerome Forissier else 872047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 873047a2428SJerome Forissier } 8741da177e4SLinus Torvalds 8751da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint); 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8781da177e4SLinus Torvalds * 8791da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8801da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8811da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8821da177e4SLinus Torvalds * to which it is replying. 8831da177e4SLinus Torvalds * 8841da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 8851da177e4SLinus Torvalds */ 8861da177e4SLinus Torvalds if (retval && chunk) 8871da177e4SLinus Torvalds retval->transport = chunk->transport; 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds return retval; 8901da177e4SLinus Torvalds } 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 8931da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 8941da177e4SLinus Torvalds const struct sctp_association *asoc, 8951da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 8961da177e4SLinus Torvalds { 8971da177e4SLinus Torvalds struct sctp_chunk *retval; 8989f81bcd9SAl Viro __be32 payload; 8991da177e4SLinus Torvalds 9001da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9011da177e4SLinus Torvalds + sizeof(tsn)); 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds if (!retval) 9041da177e4SLinus Torvalds goto no_mem; 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9071da177e4SLinus Torvalds payload = htonl(tsn); 90800f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 90900f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9121da177e4SLinus Torvalds * 9131da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9141da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9151da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9161da177e4SLinus Torvalds * to which it is replying. 9171da177e4SLinus Torvalds * 9181da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9191da177e4SLinus Torvalds */ 9201da177e4SLinus Torvalds if (chunk) 9211da177e4SLinus Torvalds retval->transport = chunk->transport; 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds no_mem: 9241da177e4SLinus Torvalds return retval; 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 9281da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 929c164a9baSSridhar Samudrala const struct msghdr *msg, 930c164a9baSSridhar Samudrala size_t paylen) 9311da177e4SLinus Torvalds { 9321da177e4SLinus Torvalds struct sctp_chunk *retval; 933c164a9baSSridhar Samudrala void *payload = NULL; 934c164a9baSSridhar Samudrala int err; 9351da177e4SLinus Torvalds 936c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 9371da177e4SLinus Torvalds if (!retval) 9381da177e4SLinus Torvalds goto err_chunk; 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds if (paylen) { 9411da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 942c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 9431da177e4SLinus Torvalds if (!payload) 9441da177e4SLinus Torvalds goto err_payload; 9451da177e4SLinus Torvalds 946c164a9baSSridhar Samudrala err = memcpy_fromiovec(payload, msg->msg_iov, paylen); 947c164a9baSSridhar Samudrala if (err < 0) 9481da177e4SLinus Torvalds goto err_copy; 9491da177e4SLinus Torvalds } 9501da177e4SLinus Torvalds 95100f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 95200f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 9531da177e4SLinus Torvalds 9541da177e4SLinus Torvalds if (paylen) 9551da177e4SLinus Torvalds kfree(payload); 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds return retval; 9581da177e4SLinus Torvalds 9591da177e4SLinus Torvalds err_copy: 9601da177e4SLinus Torvalds kfree(payload); 9611da177e4SLinus Torvalds err_payload: 9621da177e4SLinus Torvalds sctp_chunk_free(retval); 9631da177e4SLinus Torvalds retval = NULL; 9641da177e4SLinus Torvalds err_chunk: 9651da177e4SLinus Torvalds return retval; 9661da177e4SLinus Torvalds } 9671da177e4SLinus Torvalds 9685c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 9695c94bf86SAdrian Bunk * enough. 9705c94bf86SAdrian Bunk */ 9715c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 9725c94bf86SAdrian Bunk const void *data) 9735c94bf86SAdrian Bunk { 9745c94bf86SAdrian Bunk void *target; 9755c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 9765c94bf86SAdrian Bunk 9775c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 9785c94bf86SAdrian Bunk 9795c94bf86SAdrian Bunk memcpy(target, data, len); 9805c94bf86SAdrian Bunk 9815c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 9825c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 9835c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 9845c94bf86SAdrian Bunk 9855c94bf86SAdrian Bunk return target; 9865c94bf86SAdrian Bunk } 9875c94bf86SAdrian Bunk 9881da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 9891da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 9901da177e4SLinus Torvalds const struct sctp_association *asoc, 9911da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9921da177e4SLinus Torvalds const __u8 *payload, 9931da177e4SLinus Torvalds const size_t paylen) 9941da177e4SLinus Torvalds { 9951da177e4SLinus Torvalds struct sctp_chunk *retval; 9961da177e4SLinus Torvalds struct sctp_paramhdr phdr; 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 99900f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10001da177e4SLinus Torvalds if (!retval) 10011da177e4SLinus Torvalds goto end; 10021da177e4SLinus Torvalds 100300f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 100400f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 10051da177e4SLinus Torvalds 10061da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10071da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 100800f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 100900f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds end: 10121da177e4SLinus Torvalds return retval; 10131da177e4SLinus Torvalds } 10141da177e4SLinus Torvalds 1015ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1016ba016670SWei Yongjun const struct sctp_association *asoc, 1017ba016670SWei Yongjun const struct sctp_chunk *chunk, 1018ba016670SWei Yongjun struct sctp_paramhdr *param) 1019ba016670SWei Yongjun { 1020ba016670SWei Yongjun struct sctp_chunk *retval; 1021ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1022ba016670SWei Yongjun size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + 1023ba016670SWei Yongjun sizeof(sctp_paramhdr_t); 1024ba016670SWei Yongjun 1025ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1026ba016670SWei Yongjun if (!retval) 1027ba016670SWei Yongjun goto nodata; 1028ba016670SWei Yongjun 1029ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 1030ba016670SWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 1031ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 1032ba016670SWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); 1033ba016670SWei Yongjun 1034ba016670SWei Yongjun nodata: 1035ba016670SWei Yongjun return retval; 1036ba016670SWei Yongjun } 1037ba016670SWei Yongjun 10381da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 10391da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 10401da177e4SLinus Torvalds const struct sctp_transport *transport, 10411da177e4SLinus Torvalds const void *payload, const size_t paylen) 10421da177e4SLinus Torvalds { 10431da177e4SLinus Torvalds struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT, 10441da177e4SLinus Torvalds 0, paylen); 10451da177e4SLinus Torvalds 10461da177e4SLinus Torvalds if (!retval) 10471da177e4SLinus Torvalds goto nodata; 10481da177e4SLinus Torvalds 10491da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 10501da177e4SLinus Torvalds * what transport it belongs to. 10511da177e4SLinus Torvalds */ 10521da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 10531da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 10541da177e4SLinus Torvalds 10551da177e4SLinus Torvalds nodata: 10561da177e4SLinus Torvalds return retval; 10571da177e4SLinus Torvalds } 10581da177e4SLinus Torvalds 10591da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 10601da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10611da177e4SLinus Torvalds const void *payload, const size_t paylen) 10621da177e4SLinus Torvalds { 10631da177e4SLinus Torvalds struct sctp_chunk *retval; 10641da177e4SLinus Torvalds 10651da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen); 10661da177e4SLinus Torvalds if (!retval) 10671da177e4SLinus Torvalds goto nodata; 10681da177e4SLinus Torvalds 10691da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 10701da177e4SLinus Torvalds 10711da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 10721da177e4SLinus Torvalds * 10731da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 10741da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 10751da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 10761da177e4SLinus Torvalds * to which it is replying. 10771da177e4SLinus Torvalds * 10781da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 10791da177e4SLinus Torvalds */ 10801da177e4SLinus Torvalds if (chunk) 10811da177e4SLinus Torvalds retval->transport = chunk->transport; 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds nodata: 10841da177e4SLinus Torvalds return retval; 10851da177e4SLinus Torvalds } 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 10881da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 10891da177e4SLinus Torvalds */ 10901da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 10911da177e4SLinus Torvalds const struct sctp_association *asoc, 10921da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10931da177e4SLinus Torvalds size_t size) 10941da177e4SLinus Torvalds { 10951da177e4SLinus Torvalds struct sctp_chunk *retval; 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0, 10981da177e4SLinus Torvalds sizeof(sctp_errhdr_t) + size); 10991da177e4SLinus Torvalds if (!retval) 11001da177e4SLinus Torvalds goto nodata; 11011da177e4SLinus Torvalds 11021da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11031da177e4SLinus Torvalds * 11041da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11051da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 11061da177e4SLinus Torvalds * address from which it received the DATA or control chunk 11071da177e4SLinus Torvalds * to which it is replying. 11081da177e4SLinus Torvalds * 11091da177e4SLinus Torvalds */ 11101da177e4SLinus Torvalds if (chunk) 11111da177e4SLinus Torvalds retval->transport = chunk->transport; 11121da177e4SLinus Torvalds 11131da177e4SLinus Torvalds nodata: 11141da177e4SLinus Torvalds return retval; 11151da177e4SLinus Torvalds } 11161da177e4SLinus Torvalds 11171da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 11181da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 11191da177e4SLinus Torvalds const struct sctp_chunk *chunk, 112063706c5cSAl Viro __be16 cause_code, const void *payload, 11211da177e4SLinus Torvalds size_t paylen) 11221da177e4SLinus Torvalds { 11231da177e4SLinus Torvalds struct sctp_chunk *retval; 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds retval = sctp_make_op_error_space(asoc, chunk, paylen); 11261da177e4SLinus Torvalds if (!retval) 11271da177e4SLinus Torvalds goto nodata; 11281da177e4SLinus Torvalds 112900f1c2dfSWei Yongjun sctp_init_cause(retval, cause_code, paylen); 113000f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds nodata: 11331da177e4SLinus Torvalds return retval; 11341da177e4SLinus Torvalds } 11351da177e4SLinus Torvalds 11364cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 11374cd57c80SVlad Yasevich { 11384cd57c80SVlad Yasevich struct sctp_chunk *retval; 11394cd57c80SVlad Yasevich struct sctp_hmac *hmac_desc; 11404cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 11414cd57c80SVlad Yasevich __u8 *hmac; 11424cd57c80SVlad Yasevich 11434cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 11444cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 11454cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 11464cd57c80SVlad Yasevich return NULL; 11474cd57c80SVlad Yasevich 11484cd57c80SVlad Yasevich retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0, 11494cd57c80SVlad Yasevich hmac_desc->hmac_len + sizeof(sctp_authhdr_t)); 11504cd57c80SVlad Yasevich if (!retval) 11514cd57c80SVlad Yasevich return NULL; 11524cd57c80SVlad Yasevich 11534cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 11544cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 11554cd57c80SVlad Yasevich 11564cd57c80SVlad Yasevich retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), 11574cd57c80SVlad Yasevich &auth_hdr); 11584cd57c80SVlad Yasevich 11594cd57c80SVlad Yasevich hmac = skb_put(retval->skb, hmac_desc->hmac_len); 11604cd57c80SVlad Yasevich memset(hmac, 0, hmac_desc->hmac_len); 11614cd57c80SVlad Yasevich 11624cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 11634cd57c80SVlad Yasevich retval->chunk_hdr->length = 11644cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 11654cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 11664cd57c80SVlad Yasevich 11674cd57c80SVlad Yasevich return retval; 11684cd57c80SVlad Yasevich } 11694cd57c80SVlad Yasevich 11704cd57c80SVlad Yasevich 11711da177e4SLinus Torvalds /******************************************************************** 11721da177e4SLinus Torvalds * 2nd Level Abstractions 11731da177e4SLinus Torvalds ********************************************************************/ 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds /* Turn an skb into a chunk. 11761da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 11771da177e4SLinus Torvalds */ 11781da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 11791da177e4SLinus Torvalds const struct sctp_association *asoc, 11801da177e4SLinus Torvalds struct sock *sk) 11811da177e4SLinus Torvalds { 11821da177e4SLinus Torvalds struct sctp_chunk *retval; 11831da177e4SLinus Torvalds 1184c3762229SRobert P. J. Day retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC); 11851da177e4SLinus Torvalds 11861da177e4SLinus Torvalds if (!retval) 11871da177e4SLinus Torvalds goto nodata; 11881da177e4SLinus Torvalds 11891da177e4SLinus Torvalds if (!sk) { 11901da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb); 11911da177e4SLinus Torvalds } 11921da177e4SLinus Torvalds 119379af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 11941da177e4SLinus Torvalds retval->skb = skb; 11951da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 11961da177e4SLinus Torvalds retval->resent = 0; 11971da177e4SLinus Torvalds retval->has_tsn = 0; 11981da177e4SLinus Torvalds retval->has_ssn = 0; 11991da177e4SLinus Torvalds retval->rtt_in_progress = 0; 12001da177e4SLinus Torvalds retval->sent_at = 0; 12011da177e4SLinus Torvalds retval->singleton = 1; 12021da177e4SLinus Torvalds retval->end_of_packet = 0; 12031da177e4SLinus Torvalds retval->ecn_ce_done = 0; 12041da177e4SLinus Torvalds retval->pdiscard = 0; 12051da177e4SLinus Torvalds 12061da177e4SLinus Torvalds /* sctpimpguide-05.txt Section 2.8.2 12071da177e4SLinus Torvalds * M1) Each time a new DATA chunk is transmitted 12081da177e4SLinus Torvalds * set the 'TSN.Missing.Report' count for that TSN to 0. The 12091da177e4SLinus Torvalds * 'TSN.Missing.Report' count will be used to determine missing chunks 12101da177e4SLinus Torvalds * and when to fast retransmit. 12111da177e4SLinus Torvalds */ 12121da177e4SLinus Torvalds retval->tsn_missing_report = 0; 12131da177e4SLinus Torvalds retval->tsn_gap_acked = 0; 1214c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 12151da177e4SLinus Torvalds 12161da177e4SLinus Torvalds /* If this is a fragmented message, track all fragments 12171da177e4SLinus Torvalds * of the message (for SEND_FAILED). 12181da177e4SLinus Torvalds */ 12191da177e4SLinus Torvalds retval->msg = NULL; 12201da177e4SLinus Torvalds 12211da177e4SLinus Torvalds /* Polish the bead hole. */ 12221da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 12231da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 12241da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 12251da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 12261da177e4SLinus Torvalds 12271da177e4SLinus Torvalds nodata: 12281da177e4SLinus Torvalds return retval; 12291da177e4SLinus Torvalds } 12301da177e4SLinus Torvalds 12311da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 12321da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 12331da177e4SLinus Torvalds union sctp_addr *dest) 12341da177e4SLinus Torvalds { 1235f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 123616b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 12371da177e4SLinus Torvalds } 12381da177e4SLinus Torvalds 12391da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 12401da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 12411da177e4SLinus Torvalds { 12421da177e4SLinus Torvalds /* If we have a known transport, use that. */ 12431da177e4SLinus Torvalds if (chunk->transport) { 12446a1e5f33SAl Viro return &chunk->transport->ipaddr; 12451da177e4SLinus Torvalds } else { 12461da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 12476a1e5f33SAl Viro return &chunk->source; 12481da177e4SLinus Torvalds } 12491da177e4SLinus Torvalds } 12501da177e4SLinus Torvalds 12511da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 12521da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 12531da177e4SLinus Torvalds */ 12541da177e4SLinus Torvalds SCTP_STATIC 12551da177e4SLinus Torvalds struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc, 12561da177e4SLinus Torvalds __u8 type, __u8 flags, int paylen) 12571da177e4SLinus Torvalds { 12581da177e4SLinus Torvalds struct sctp_chunk *retval; 12591da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 12601da177e4SLinus Torvalds struct sk_buff *skb; 12611da177e4SLinus Torvalds struct sock *sk; 12621da177e4SLinus Torvalds 12631da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 12641da177e4SLinus Torvalds skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), 12651da177e4SLinus Torvalds GFP_ATOMIC); 12661da177e4SLinus Torvalds if (!skb) 12671da177e4SLinus Torvalds goto nodata; 12681da177e4SLinus Torvalds 12691da177e4SLinus Torvalds /* Make room for the chunk header. */ 12701da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 12711da177e4SLinus Torvalds chunk_hdr->type = type; 12721da177e4SLinus Torvalds chunk_hdr->flags = flags; 12731da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 12741da177e4SLinus Torvalds 12751da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 12761da177e4SLinus Torvalds retval = sctp_chunkify(skb, asoc, sk); 12771da177e4SLinus Torvalds if (!retval) { 12781da177e4SLinus Torvalds kfree_skb(skb); 12791da177e4SLinus Torvalds goto nodata; 12801da177e4SLinus Torvalds } 12811da177e4SLinus Torvalds 12821da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 12831da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 12841da177e4SLinus Torvalds 12854cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 12864cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 12874cd57c80SVlad Yasevich retval->auth = 1; 12884cd57c80SVlad Yasevich 12891da177e4SLinus Torvalds /* Set the skb to the belonging sock for accounting. */ 12901da177e4SLinus Torvalds skb->sk = sk; 12911da177e4SLinus Torvalds 12921da177e4SLinus Torvalds return retval; 12931da177e4SLinus Torvalds nodata: 12941da177e4SLinus Torvalds return NULL; 12951da177e4SLinus Torvalds } 12961da177e4SLinus Torvalds 12971da177e4SLinus Torvalds 12981da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 12991da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 13001da177e4SLinus Torvalds { 1301a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1302a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1303a08de64dSVlad Yasevich 13041da177e4SLinus Torvalds /* Free the chunk skb data and the SCTP_chunk stub itself. */ 13051da177e4SLinus Torvalds dev_kfree_skb(chunk->skb); 13061da177e4SLinus Torvalds 13071da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 13081da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 13091da177e4SLinus Torvalds } 13101da177e4SLinus Torvalds 13111da177e4SLinus Torvalds /* Possibly, free the chunk. */ 13121da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 13131da177e4SLinus Torvalds { 13141da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 13151da177e4SLinus Torvalds if (chunk->msg) 13161da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 13171da177e4SLinus Torvalds 13181da177e4SLinus Torvalds sctp_chunk_put(chunk); 13191da177e4SLinus Torvalds } 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 13221da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 13231da177e4SLinus Torvalds { 13241da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 13251da177e4SLinus Torvalds } 13261da177e4SLinus Torvalds 13271da177e4SLinus Torvalds /* Release a reference to the chunk. */ 13281da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 13291da177e4SLinus Torvalds { 13301da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 13311da177e4SLinus Torvalds sctp_chunk_destroy(ch); 13321da177e4SLinus Torvalds } 13331da177e4SLinus Torvalds 13341da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 13351da177e4SLinus Torvalds * enough. 13361da177e4SLinus Torvalds */ 13371da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 13381da177e4SLinus Torvalds { 13391da177e4SLinus Torvalds void *target; 13401da177e4SLinus Torvalds void *padding; 13411da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 13428d614adeSWei Yongjun int padlen = WORD_ROUND(chunklen) - chunklen; 13431da177e4SLinus Torvalds 13441da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 13451da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 13461da177e4SLinus Torvalds 13471da177e4SLinus Torvalds memset(padding, 0, padlen); 13481da177e4SLinus Torvalds memcpy(target, data, len); 13491da177e4SLinus Torvalds 13501da177e4SLinus Torvalds /* Adjust the chunk length field. */ 13511da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 135227a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 13531da177e4SLinus Torvalds 13541da177e4SLinus Torvalds return target; 13551da177e4SLinus Torvalds } 13561da177e4SLinus Torvalds 13571da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 13581da177e4SLinus Torvalds * chunk is not big enough. 13591da177e4SLinus Torvalds * Returns a kernel err value. 13601da177e4SLinus Torvalds */ 13611da177e4SLinus Torvalds int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len, 13621da177e4SLinus Torvalds struct iovec *data) 13631da177e4SLinus Torvalds { 13641da177e4SLinus Torvalds __u8 *target; 13651da177e4SLinus Torvalds int err = 0; 13661da177e4SLinus Torvalds 13671da177e4SLinus Torvalds /* Make room in chunk for data. */ 13681da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 13691da177e4SLinus Torvalds 13701da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 13711da177e4SLinus Torvalds if ((err = memcpy_fromiovecend(target, data, off, len))) 13721da177e4SLinus Torvalds goto out; 13731da177e4SLinus Torvalds 13741da177e4SLinus Torvalds /* Adjust the chunk length field. */ 13751da177e4SLinus Torvalds chunk->chunk_hdr->length = 13761da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 137727a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 13781da177e4SLinus Torvalds 13791da177e4SLinus Torvalds out: 13801da177e4SLinus Torvalds return err; 13811da177e4SLinus Torvalds } 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 13841da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 13851da177e4SLinus Torvalds */ 13861da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 13871da177e4SLinus Torvalds { 1388ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1389ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1390ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 13911da177e4SLinus Torvalds __u16 ssn; 13921da177e4SLinus Torvalds __u16 sid; 13931da177e4SLinus Torvalds 13941da177e4SLinus Torvalds if (chunk->has_ssn) 13951da177e4SLinus Torvalds return; 13961da177e4SLinus Torvalds 1397ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1398ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1399ab3e5e7bSVlad Yasevich stream = &chunk->asoc->ssnmap->out; 1400ab3e5e7bSVlad Yasevich 1401ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1402ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1403ab3e5e7bSVlad Yasevich */ 1404ab3e5e7bSVlad Yasevich msg = chunk->msg; 1405ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1406ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 14071da177e4SLinus Torvalds ssn = 0; 14081da177e4SLinus Torvalds } else { 1409ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1410ab3e5e7bSVlad Yasevich ssn = sctp_ssn_next(stream, sid); 14111da177e4SLinus Torvalds else 1412ab3e5e7bSVlad Yasevich ssn = sctp_ssn_peek(stream, sid); 14131da177e4SLinus Torvalds } 14141da177e4SLinus Torvalds 1415ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1416ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1417ab3e5e7bSVlad Yasevich } 14181da177e4SLinus Torvalds } 14191da177e4SLinus Torvalds 14201da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 14211da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 14221da177e4SLinus Torvalds */ 14231da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 14241da177e4SLinus Torvalds { 14251da177e4SLinus Torvalds if (!chunk->has_tsn) { 14261da177e4SLinus Torvalds /* This is the last possible instant to 14271da177e4SLinus Torvalds * assign a TSN. 14281da177e4SLinus Torvalds */ 14291da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 14301da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 14311da177e4SLinus Torvalds chunk->has_tsn = 1; 14321da177e4SLinus Torvalds } 14331da177e4SLinus Torvalds } 14341da177e4SLinus Torvalds 14351da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 14361da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 14373182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1438dd0fc66fSAl Viro gfp_t gfp) 14391da177e4SLinus Torvalds { 14401da177e4SLinus Torvalds struct sctp_association *asoc; 14411da177e4SLinus Torvalds struct sk_buff *skb; 14421da177e4SLinus Torvalds sctp_scope_t scope; 14431da177e4SLinus Torvalds struct sctp_af *af; 14441da177e4SLinus Torvalds 14451da177e4SLinus Torvalds /* Create the bare association. */ 14461da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 14471da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 14481da177e4SLinus Torvalds if (!asoc) 14491da177e4SLinus Torvalds goto nodata; 14501da177e4SLinus Torvalds asoc->temp = 1; 14511da177e4SLinus Torvalds skb = chunk->skb; 14521da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1453eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); 14541da177e4SLinus Torvalds if (unlikely(!af)) 14551da177e4SLinus Torvalds goto fail; 1456d55c41b1SAl Viro af->from_skb(&asoc->c.peer_addr, skb, 1); 14571da177e4SLinus Torvalds nodata: 14581da177e4SLinus Torvalds return asoc; 14591da177e4SLinus Torvalds 14601da177e4SLinus Torvalds fail: 14611da177e4SLinus Torvalds sctp_association_free(asoc); 14621da177e4SLinus Torvalds return NULL; 14631da177e4SLinus Torvalds } 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds /* Build a cookie representing asoc. 14661da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 14671da177e4SLinus Torvalds */ 14681da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 14691da177e4SLinus Torvalds const struct sctp_association *asoc, 14701da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 14711da177e4SLinus Torvalds int *cookie_len, 14721da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 14731da177e4SLinus Torvalds { 14741da177e4SLinus Torvalds sctp_cookie_param_t *retval; 14751da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 14761da177e4SLinus Torvalds struct scatterlist sg; 14771da177e4SLinus Torvalds int headersize, bodysize; 14781da177e4SLinus Torvalds unsigned int keylen; 14791da177e4SLinus Torvalds char *key; 14801da177e4SLinus Torvalds 14819834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 14829834a2bbSVlad Yasevich * any padding. 14839834a2bbSVlad Yasevich */ 14849834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 14859834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 14869834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 14871da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 14881da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 14891da177e4SLinus Torvalds 14901da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 14911da177e4SLinus Torvalds * functions simpler to write. 14921da177e4SLinus Torvalds */ 14931da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 14941da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 14951da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 14961da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 14971da177e4SLinus Torvalds 14981da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 14991da177e4SLinus Torvalds * out on the network. 15001da177e4SLinus Torvalds */ 1501af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1502af997d8cSArnaldo Carvalho de Melo if (!retval) 1503af997d8cSArnaldo Carvalho de Melo goto nodata; 1504af997d8cSArnaldo Carvalho de Melo 15051da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 15061da177e4SLinus Torvalds 15071da177e4SLinus Torvalds /* Set up the parameter header. */ 15081da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 15091da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 15101da177e4SLinus Torvalds 15111da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 15121da177e4SLinus Torvalds cookie->c = asoc->c; 15131da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 15141da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 15151da177e4SLinus Torvalds 15161da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 15171da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 15181da177e4SLinus Torvalds 15190f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 15200f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 15211da177e4SLinus Torvalds 15221da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 15231da177e4SLinus Torvalds do_gettimeofday(&cookie->c.expiration); 15241da177e4SLinus Torvalds TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration); 15251da177e4SLinus Torvalds 15261da177e4SLinus Torvalds /* Copy the peer's init packet. */ 15271da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 15281da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 15291da177e4SLinus Torvalds 15301da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 15311da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 15321da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 15331da177e4SLinus Torvalds 15341da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 15351b489e11SHerbert Xu struct hash_desc desc; 15361b489e11SHerbert Xu 15371da177e4SLinus Torvalds /* Sign the message. */ 153868e3f5ddSHerbert Xu sg_init_one(&sg, &cookie->c, bodysize); 15391da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 15401da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 15411b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 15421b489e11SHerbert Xu desc.flags = 0; 15431da177e4SLinus Torvalds 15441b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 15451b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, cookie->signature)) 15461b489e11SHerbert Xu goto free_cookie; 15471da177e4SLinus Torvalds } 15481da177e4SLinus Torvalds 15491da177e4SLinus Torvalds return retval; 15501b489e11SHerbert Xu 15511b489e11SHerbert Xu free_cookie: 15521b489e11SHerbert Xu kfree(retval); 15531b489e11SHerbert Xu nodata: 15541b489e11SHerbert Xu *cookie_len = 0; 15551b489e11SHerbert Xu return NULL; 15561da177e4SLinus Torvalds } 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 15591da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 15601da177e4SLinus Torvalds const struct sctp_endpoint *ep, 15611da177e4SLinus Torvalds const struct sctp_association *asoc, 1562dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 15631da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 15641da177e4SLinus Torvalds { 15651da177e4SLinus Torvalds struct sctp_association *retval = NULL; 15661da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 15671da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 15681da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1569313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 15701da177e4SLinus Torvalds struct scatterlist sg; 15711da177e4SLinus Torvalds unsigned int keylen, len; 15721da177e4SLinus Torvalds char *key; 15731da177e4SLinus Torvalds sctp_scope_t scope; 15741da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1575a61bbcf2SPatrick McHardy struct timeval tv; 15761b489e11SHerbert Xu struct hash_desc desc; 15771da177e4SLinus Torvalds 15789834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 15799834a2bbSVlad Yasevich * any padding. 15809834a2bbSVlad Yasevich */ 15819834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 15829834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 15839834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 15841da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 15851da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 15861da177e4SLinus Torvalds 15871da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 15881da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 15891da177e4SLinus Torvalds * INIT chunk. 15901da177e4SLinus Torvalds */ 15911da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 15921da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 15931da177e4SLinus Torvalds goto malformed; 15941da177e4SLinus Torvalds 15951da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 15961da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 15971da177e4SLinus Torvalds goto malformed; 15981da177e4SLinus Torvalds 15991da177e4SLinus Torvalds /* Process the cookie. */ 16001da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 16011da177e4SLinus Torvalds bear_cookie = &cookie->c; 16021da177e4SLinus Torvalds 16031da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 16041da177e4SLinus Torvalds goto no_hmac; 16051da177e4SLinus Torvalds 16061da177e4SLinus Torvalds /* Check the signature. */ 16071da177e4SLinus Torvalds keylen = SCTP_SECRET_SIZE; 160868e3f5ddSHerbert Xu sg_init_one(&sg, bear_cookie, bodysize); 16091da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->current_key]; 16101b489e11SHerbert Xu desc.tfm = sctp_sk(ep->base.sk)->hmac; 16111b489e11SHerbert Xu desc.flags = 0; 16121da177e4SLinus Torvalds 16138ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 16141b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 16151b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 16161b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 16171b489e11SHerbert Xu goto fail; 16181b489e11SHerbert Xu } 16191da177e4SLinus Torvalds 16201da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 16211da177e4SLinus Torvalds /* Try the previous key. */ 16221da177e4SLinus Torvalds key = (char *)ep->secret_key[ep->last_key]; 16238ca84481SAl Viro memset(digest, 0x00, SCTP_SIGNATURE_SIZE); 16241b489e11SHerbert Xu if (crypto_hash_setkey(desc.tfm, key, keylen) || 16251b489e11SHerbert Xu crypto_hash_digest(&desc, &sg, bodysize, digest)) { 16261b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 16271b489e11SHerbert Xu goto fail; 16281b489e11SHerbert Xu } 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 16311da177e4SLinus Torvalds /* Yikes! Still bad signature! */ 16321da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 16331da177e4SLinus Torvalds goto fail; 16341da177e4SLinus Torvalds } 16351da177e4SLinus Torvalds } 16361da177e4SLinus Torvalds 16371da177e4SLinus Torvalds no_hmac: 16381da177e4SLinus Torvalds /* IG Section 2.35.2: 16391da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 16401da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 16411da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 16421da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 16431da177e4SLinus Torvalds * discarded, 16441da177e4SLinus Torvalds */ 16451da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 16461da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 16471da177e4SLinus Torvalds goto fail; 16481da177e4SLinus Torvalds } 16491da177e4SLinus Torvalds 16509b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 16511da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 16521da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 16531da177e4SLinus Torvalds goto fail; 16541da177e4SLinus Torvalds } 16551da177e4SLinus Torvalds 16561da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 16571da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 16581da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1659f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1660f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1661f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1662f236218bSVlad Yasevich * down the new association establishment instead of every packet. 16631da177e4SLinus Torvalds */ 1664f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 1665a61bbcf2SPatrick McHardy skb_get_timestamp(skb, &tv); 1666f236218bSVlad Yasevich else 1667f236218bSVlad Yasevich do_gettimeofday(&tv); 1668f236218bSVlad Yasevich 1669a61bbcf2SPatrick McHardy if (!asoc && tv_lt(bear_cookie->expiration, tv)) { 16701da177e4SLinus Torvalds /* 16711da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 16721da177e4SLinus Torvalds * 16731da177e4SLinus Torvalds * Cause of error 16741da177e4SLinus Torvalds * --------------- 16751da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 16761da177e4SLinus Torvalds * Cookie that has expired. 16771da177e4SLinus Torvalds */ 16781da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 16791da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 16801da177e4SLinus Torvalds if (*errp) { 1681a61bbcf2SPatrick McHardy suseconds_t usecs = (tv.tv_sec - 16821da177e4SLinus Torvalds bear_cookie->expiration.tv_sec) * 1000000L + 1683a61bbcf2SPatrick McHardy tv.tv_usec - bear_cookie->expiration.tv_usec; 168434bcca28SAl Viro __be32 n = htonl(usecs); 16851da177e4SLinus Torvalds 16861da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 168700f1c2dfSWei Yongjun sizeof(n)); 168800f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 16891da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 16901da177e4SLinus Torvalds } else 16911da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 16921da177e4SLinus Torvalds 16931da177e4SLinus Torvalds goto fail; 16941da177e4SLinus Torvalds } 16951da177e4SLinus Torvalds 16961da177e4SLinus Torvalds /* Make a new base association. */ 16971da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 16981da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 16991da177e4SLinus Torvalds if (!retval) { 17001da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17011da177e4SLinus Torvalds goto fail; 17021da177e4SLinus Torvalds } 17031da177e4SLinus Torvalds 17041da177e4SLinus Torvalds /* Set up our peer's port number. */ 17051da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 17061da177e4SLinus Torvalds 17071da177e4SLinus Torvalds /* Populate the association from the cookie. */ 17081da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 17111da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 17121da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 17131da177e4SLinus Torvalds goto fail; 17141da177e4SLinus Torvalds } 17151da177e4SLinus Torvalds 17161da177e4SLinus Torvalds /* Also, add the destination address. */ 17171da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1718f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1719f57d96b2SVlad Yasevich SCTP_ADDR_SRC, GFP_ATOMIC); 17201da177e4SLinus Torvalds } 17211da177e4SLinus Torvalds 17221da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 17231da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 17241da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 17251da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 17261da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 17270f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 17281da177e4SLinus Torvalds 17291da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 17301da177e4SLinus Torvalds return retval; 17311da177e4SLinus Torvalds 17321da177e4SLinus Torvalds fail: 17331da177e4SLinus Torvalds if (retval) 17341da177e4SLinus Torvalds sctp_association_free(retval); 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds return NULL; 17371da177e4SLinus Torvalds 17381da177e4SLinus Torvalds malformed: 17391da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 17401da177e4SLinus Torvalds * malformed. 17411da177e4SLinus Torvalds */ 17421da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 17431da177e4SLinus Torvalds goto fail; 17441da177e4SLinus Torvalds } 17451da177e4SLinus Torvalds 17461da177e4SLinus Torvalds /******************************************************************** 17471da177e4SLinus Torvalds * 3rd Level Abstractions 17481da177e4SLinus Torvalds ********************************************************************/ 17491da177e4SLinus Torvalds 17501da177e4SLinus Torvalds struct __sctp_missing { 17519f81bcd9SAl Viro __be32 num_missing; 17529f81bcd9SAl Viro __be16 type; 17531da177e4SLinus Torvalds } __attribute__((packed)); 17541da177e4SLinus Torvalds 17551da177e4SLinus Torvalds /* 17561da177e4SLinus Torvalds * Report a missing mandatory parameter. 17571da177e4SLinus Torvalds */ 17581da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 17591da177e4SLinus Torvalds sctp_param_t paramtype, 17601da177e4SLinus Torvalds struct sctp_chunk *chunk, 17611da177e4SLinus Torvalds struct sctp_chunk **errp) 17621da177e4SLinus Torvalds { 17631da177e4SLinus Torvalds struct __sctp_missing report; 17641da177e4SLinus Torvalds __u16 len; 17651da177e4SLinus Torvalds 17661da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 17671da177e4SLinus Torvalds 17681da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 17691da177e4SLinus Torvalds * returning multiple unknown parameters. 17701da177e4SLinus Torvalds */ 17711da177e4SLinus Torvalds if (!*errp) 17721da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 17731da177e4SLinus Torvalds 17741da177e4SLinus Torvalds if (*errp) { 17751da177e4SLinus Torvalds report.num_missing = htonl(1); 17761da177e4SLinus Torvalds report.type = paramtype; 1777ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 177800f1c2dfSWei Yongjun sizeof(report)); 177900f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 17801da177e4SLinus Torvalds } 17811da177e4SLinus Torvalds 17821da177e4SLinus Torvalds /* Stop processing this chunk. */ 17831da177e4SLinus Torvalds return 0; 17841da177e4SLinus Torvalds } 17851da177e4SLinus Torvalds 17861da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 17871da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 17881da177e4SLinus Torvalds struct sctp_chunk *chunk, 17891da177e4SLinus Torvalds struct sctp_chunk **errp) 17901da177e4SLinus Torvalds { 17911da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 17921da177e4SLinus Torvalds 17931da177e4SLinus Torvalds if (!*errp) 17941da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 17951da177e4SLinus Torvalds 17961da177e4SLinus Torvalds if (*errp) 179700f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 17981da177e4SLinus Torvalds 17991da177e4SLinus Torvalds /* Stop processing this chunk. */ 18001da177e4SLinus Torvalds return 0; 18011da177e4SLinus Torvalds } 18021da177e4SLinus Torvalds 18031da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 18041da177e4SLinus Torvalds struct sctp_paramhdr *param, 18051da177e4SLinus Torvalds const struct sctp_chunk *chunk, 18061da177e4SLinus Torvalds struct sctp_chunk **errp) 18071da177e4SLinus Torvalds { 18087ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 18097ab90804SVlad Yasevich * not reported. 18107ab90804SVlad Yasevich */ 18117ab90804SVlad Yasevich if (*errp) 18127ab90804SVlad Yasevich sctp_chunk_free(*errp); 18137ab90804SVlad Yasevich 18141da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1815ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 18161da177e4SLinus Torvalds 18171da177e4SLinus Torvalds return 0; 18181da177e4SLinus Torvalds } 18191da177e4SLinus Torvalds 18201da177e4SLinus Torvalds 18211da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 18221da177e4SLinus Torvalds * send back an indicator to the peer. 18231da177e4SLinus Torvalds */ 18241da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 18251da177e4SLinus Torvalds union sctp_params param, 18261da177e4SLinus Torvalds struct sctp_chunk *chunk, 18271da177e4SLinus Torvalds struct sctp_chunk **errp) 18281da177e4SLinus Torvalds { 18291da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 18301da177e4SLinus Torvalds 18317ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 18327ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 18337ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 18347ab90804SVlad Yasevich * them in the ABORT. 18357ab90804SVlad Yasevich */ 18367ab90804SVlad Yasevich if (*errp) 18377ab90804SVlad Yasevich sctp_chunk_free(*errp); 18387ab90804SVlad Yasevich 18391da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18401da177e4SLinus Torvalds 184100f1c2dfSWei Yongjun if (*errp) { 184200f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 184300f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 184400f1c2dfSWei Yongjun } 18451da177e4SLinus Torvalds 18461da177e4SLinus Torvalds /* Stop processing this chunk. */ 18471da177e4SLinus Torvalds return 0; 18481da177e4SLinus Torvalds } 18491da177e4SLinus Torvalds 1850d6701191SVlad Yasevich static int sctp_verify_ext_param(union sctp_params param) 1851d6701191SVlad Yasevich { 1852d6701191SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1853d6701191SVlad Yasevich int have_auth = 0; 1854d6701191SVlad Yasevich int have_asconf = 0; 1855d6701191SVlad Yasevich int i; 1856d6701191SVlad Yasevich 1857d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1858d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1859d6701191SVlad Yasevich case SCTP_CID_AUTH: 1860d6701191SVlad Yasevich have_auth = 1; 1861d6701191SVlad Yasevich break; 1862d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1863d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1864d6701191SVlad Yasevich have_asconf = 1; 1865d6701191SVlad Yasevich break; 1866d6701191SVlad Yasevich } 1867d6701191SVlad Yasevich } 1868d6701191SVlad Yasevich 1869d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1870d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 1871d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 1872d6701191SVlad Yasevich * mode. 1873d6701191SVlad Yasevich */ 1874d6701191SVlad Yasevich if (sctp_addip_noauth) 1875d6701191SVlad Yasevich return 1; 1876d6701191SVlad Yasevich 1877d6701191SVlad Yasevich if (sctp_addip_enable && !have_auth && have_asconf) 1878d6701191SVlad Yasevich return 0; 1879d6701191SVlad Yasevich 1880d6701191SVlad Yasevich return 1; 1881d6701191SVlad Yasevich } 1882d6701191SVlad Yasevich 1883131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 1884131a47e3SVlad Yasevich union sctp_params param) 1885131a47e3SVlad Yasevich { 1886131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 1887131a47e3SVlad Yasevich int i; 1888131a47e3SVlad Yasevich 1889131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 1890131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 1891131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 1892131a47e3SVlad Yasevich if (sctp_prsctp_enable && 1893131a47e3SVlad Yasevich !asoc->peer.prsctp_capable) 1894131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 1895131a47e3SVlad Yasevich break; 1896730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 1897730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 1898730fc3d0SVlad Yasevich * supports AUTH. 1899730fc3d0SVlad Yasevich */ 19000ef46e28SVlad Yasevich if (sctp_auth_enable) 1901730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 1902730fc3d0SVlad Yasevich break; 1903131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 1904131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 19050ef46e28SVlad Yasevich if (sctp_addip_enable) 190688799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 19076b2f9cb6SVlad Yasevich break; 1908131a47e3SVlad Yasevich default: 1909131a47e3SVlad Yasevich break; 1910131a47e3SVlad Yasevich } 1911131a47e3SVlad Yasevich } 1912131a47e3SVlad Yasevich } 1913131a47e3SVlad Yasevich 19141da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 19151da177e4SLinus Torvalds * 19161da177e4SLinus Torvalds * The Parameter Types are encoded such that the 19171da177e4SLinus Torvalds * highest-order two bits specify the action that must be 19181da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 19191da177e4SLinus Torvalds * Parameter Type. 19201da177e4SLinus Torvalds * 19217ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 19227ab90804SVlad Yasevich * parameters within this chunk 19231da177e4SLinus Torvalds * 19247ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 19257ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 19267ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 19271da177e4SLinus Torvalds * 19281da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 19291da177e4SLinus Torvalds * 19301da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 19311da177e4SLinus Torvalds * report the unrecognized parameter in an 19327ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 19331da177e4SLinus Torvalds * 19341da177e4SLinus Torvalds * Return value: 19357ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 19367ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 19377ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 19381da177e4SLinus Torvalds */ 19397ab90804SVlad Yasevich static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, 19401da177e4SLinus Torvalds union sctp_params param, 19411da177e4SLinus Torvalds struct sctp_chunk *chunk, 19421da177e4SLinus Torvalds struct sctp_chunk **errp) 19431da177e4SLinus Torvalds { 19447ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 19451da177e4SLinus Torvalds 19461da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 19471da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 19487ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 19491da177e4SLinus Torvalds break; 19501da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 19511da177e4SLinus Torvalds break; 19527ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 19537ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 19547ab90804SVlad Yasevich /* Fall through */ 19551da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 19561da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 19571da177e4SLinus Torvalds * returning multiple unknown parameters. 19581da177e4SLinus Torvalds */ 19591da177e4SLinus Torvalds if (NULL == *errp) 19601da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 19611da177e4SLinus Torvalds ntohs(chunk->chunk_hdr->length)); 19621da177e4SLinus Torvalds 19631da177e4SLinus Torvalds if (*errp) { 19641da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM, 19651da177e4SLinus Torvalds WORD_ROUND(ntohs(param.p->length))); 196600f1c2dfSWei Yongjun sctp_addto_chunk(*errp, 196700f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 196800f1c2dfSWei Yongjun param.v); 19691da177e4SLinus Torvalds } else { 19701da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 19711da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 19721da177e4SLinus Torvalds * to the peer and the association won't be 19731da177e4SLinus Torvalds * established. 19741da177e4SLinus Torvalds */ 19757ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 19761da177e4SLinus Torvalds } 19771da177e4SLinus Torvalds break; 19781da177e4SLinus Torvalds default: 19791da177e4SLinus Torvalds break; 19801da177e4SLinus Torvalds } 19811da177e4SLinus Torvalds 19821da177e4SLinus Torvalds return retval; 19831da177e4SLinus Torvalds } 19841da177e4SLinus Torvalds 19857ab90804SVlad Yasevich /* Verify variable length parameters 19861da177e4SLinus Torvalds * Return values: 19877ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 19887ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 19897ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 19907ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 19911da177e4SLinus Torvalds */ 19927ab90804SVlad Yasevich static sctp_ierror_t sctp_verify_param(const struct sctp_association *asoc, 19931da177e4SLinus Torvalds union sctp_params param, 19941da177e4SLinus Torvalds sctp_cid_t cid, 19951da177e4SLinus Torvalds struct sctp_chunk *chunk, 19961da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 19971da177e4SLinus Torvalds { 199872da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 19997ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 200072da7b38SWei Yongjun __u16 n_elt, id = 0; 200172da7b38SWei Yongjun int i; 20021da177e4SLinus Torvalds 20031da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 20041da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 20051da177e4SLinus Torvalds * identified based on the chunk id. 20061da177e4SLinus Torvalds */ 20071da177e4SLinus Torvalds 20081da177e4SLinus Torvalds switch (param.p->type) { 20091da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 20101da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 20111da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 20121da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 20131da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 20141da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 20151da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 20161da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 20170f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2018d6701191SVlad Yasevich break; 2019d6701191SVlad Yasevich 2020131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2021d6701191SVlad Yasevich if (!sctp_verify_ext_param(param)) 2022d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 20231da177e4SLinus Torvalds break; 20241da177e4SLinus Torvalds 2025d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2026d6de3097SVlad Yasevich if (sctp_addip_enable) 2027d6de3097SVlad Yasevich break; 2028d6de3097SVlad Yasevich goto fallthrough; 2029d6de3097SVlad Yasevich 20301da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 20311da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 20327ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 20337ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 20347ab90804SVlad Yasevich break; 2035131a47e3SVlad Yasevich 20361da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 20371da177e4SLinus Torvalds if (sctp_prsctp_enable) 20381da177e4SLinus Torvalds break; 2039730fc3d0SVlad Yasevich goto fallthrough; 2040730fc3d0SVlad Yasevich 2041730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2042730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2043730fc3d0SVlad Yasevich goto fallthrough; 2044730fc3d0SVlad Yasevich 2045730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2046730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2047730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2048730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2049730fc3d0SVlad Yasevich */ 2050730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 20517ab90804SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { 20527ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2053730fc3d0SVlad Yasevich chunk, err_chunk); 20547ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 20557ab90804SVlad Yasevich } 2056730fc3d0SVlad Yasevich break; 2057730fc3d0SVlad Yasevich 2058730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2059730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2060730fc3d0SVlad Yasevich goto fallthrough; 2061730fc3d0SVlad Yasevich 2062730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2063730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2064730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2065730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2066730fc3d0SVlad Yasevich */ 20677ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 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_HMAC_ALGO: 207572da7b38SWei Yongjun if (!sctp_auth_enable) 207672da7b38SWei Yongjun goto fallthrough; 207772da7b38SWei Yongjun 207872da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 207972da7b38SWei Yongjun n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; 208072da7b38SWei Yongjun 208172da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 208272da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 208372da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 208472da7b38SWei Yongjun */ 208572da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 208672da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 208772da7b38SWei Yongjun 208872da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2089730fc3d0SVlad Yasevich break; 209072da7b38SWei Yongjun } 209172da7b38SWei Yongjun 209272da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 209372da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 209472da7b38SWei Yongjun err_chunk); 209572da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 209672da7b38SWei Yongjun } 209772da7b38SWei Yongjun break; 2098730fc3d0SVlad Yasevich fallthrough: 20991da177e4SLinus Torvalds default: 21001da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n", 21011da177e4SLinus Torvalds ntohs(param.p->type), cid); 21027ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 21031da177e4SLinus Torvalds break; 21041da177e4SLinus Torvalds } 21051da177e4SLinus Torvalds return retval; 21061da177e4SLinus Torvalds } 21071da177e4SLinus Torvalds 21081da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 21091da177e4SLinus Torvalds int sctp_verify_init(const struct sctp_association *asoc, 21101da177e4SLinus Torvalds sctp_cid_t cid, 21111da177e4SLinus Torvalds sctp_init_chunk_t *peer_init, 21121da177e4SLinus Torvalds struct sctp_chunk *chunk, 21131da177e4SLinus Torvalds struct sctp_chunk **errp) 21141da177e4SLinus Torvalds { 21151da177e4SLinus Torvalds union sctp_params param; 21161da177e4SLinus Torvalds int has_cookie = 0; 21177ab90804SVlad Yasevich int result; 21181da177e4SLinus Torvalds 21191da177e4SLinus Torvalds /* Verify stream values are non-zero. */ 21201da177e4SLinus Torvalds if ((0 == peer_init->init_hdr.num_outbound_streams) || 2121d023f629SVlad Yasevich (0 == peer_init->init_hdr.num_inbound_streams) || 2122d023f629SVlad Yasevich (0 == peer_init->init_hdr.init_tag) || 2123d023f629SVlad Yasevich (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) { 21241da177e4SLinus Torvalds 21257ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 21261da177e4SLinus Torvalds } 21271da177e4SLinus Torvalds 21281da177e4SLinus Torvalds /* Check for missing mandatory parameters. */ 21291da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 21301da177e4SLinus Torvalds 21311da177e4SLinus Torvalds if (SCTP_PARAM_STATE_COOKIE == param.p->type) 21321da177e4SLinus Torvalds has_cookie = 1; 21331da177e4SLinus Torvalds 21341da177e4SLinus Torvalds } /* for (loop through all parameters) */ 21351da177e4SLinus Torvalds 21361da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 21371da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 21381da177e4SLinus Torvalds * The current param.p would point at the bad one. 21391da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 21401da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 21411da177e4SLinus Torvalds * error handling code build and send the packet. 21421da177e4SLinus Torvalds */ 21437ab90804SVlad Yasevich if (param.v != (void*)chunk->chunk_end) 21447ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 21451da177e4SLinus Torvalds 21461da177e4SLinus Torvalds /* The only missing mandatory param possible today is 21471da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 21481da177e4SLinus Torvalds */ 21497ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 21507ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 21511da177e4SLinus Torvalds chunk, errp); 21521da177e4SLinus Torvalds 21537ab90804SVlad Yasevich /* Verify all the variable length parameters */ 21541da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 21551da177e4SLinus Torvalds 21567ab90804SVlad Yasevich result = sctp_verify_param(asoc, param, cid, chunk, errp); 21577ab90804SVlad Yasevich switch (result) { 21587ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 21597ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 21601da177e4SLinus Torvalds return 0; 21617ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 21621da177e4SLinus Torvalds return 1; 21637ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 21647ab90804SVlad Yasevich default: 21657ab90804SVlad Yasevich break; 21661da177e4SLinus Torvalds } 21671da177e4SLinus Torvalds 21681da177e4SLinus Torvalds } /* for (loop through all parameters) */ 21691da177e4SLinus Torvalds 21701da177e4SLinus Torvalds return 1; 21711da177e4SLinus Torvalds } 21721da177e4SLinus Torvalds 21731da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 21741da177e4SLinus Torvalds * Returns 0 on failure, else success. 21751da177e4SLinus Torvalds * FIXME: This is an association method. 21761da177e4SLinus Torvalds */ 21771da177e4SLinus Torvalds int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid, 21781da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2179dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 21801da177e4SLinus Torvalds { 21811da177e4SLinus Torvalds union sctp_params param; 21821da177e4SLinus Torvalds struct sctp_transport *transport; 21831da177e4SLinus Torvalds struct list_head *pos, *temp; 21841da177e4SLinus Torvalds char *cookie; 21851da177e4SLinus Torvalds 21861da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 21871da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 21881da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 21891da177e4SLinus Torvalds * of the INIT from the cookie. 21901da177e4SLinus Torvalds */ 21911da177e4SLinus Torvalds 21921da177e4SLinus Torvalds /* This implementation defaults to making the first transport 21931da177e4SLinus Torvalds * added as the primary transport. The source address seems to 21941da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 21951da177e4SLinus Torvalds */ 21964bdf4b5fSAl Viro if (peer_addr) { 21976a1e5f33SAl Viro if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 21981da177e4SLinus Torvalds goto nomem; 21994bdf4b5fSAl Viro } 22001da177e4SLinus Torvalds 22011da177e4SLinus Torvalds /* Process the initialization parameters. */ 22021da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22031da177e4SLinus Torvalds 22041da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 22051da177e4SLinus Torvalds goto clean_up; 22061da177e4SLinus Torvalds } 22071da177e4SLinus Torvalds 2208730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2209730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2210730fc3d0SVlad Yasevich */ 2211730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2212730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2213730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2214730fc3d0SVlad Yasevich 2215d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2216d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2217d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2218d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2219d6701191SVlad Yasevich * is what we'll do here. 22206b2f9cb6SVlad Yasevich */ 222173d9c4fdSVlad Yasevich if (!sctp_addip_noauth && 222273d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 22236b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 22246b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 22256b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 222688799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2227d6701191SVlad Yasevich goto clean_up; 22286b2f9cb6SVlad Yasevich } 22296b2f9cb6SVlad Yasevich 22303f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 22313f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 22323f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 22333f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 22343f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 22353f7a87d2SFrank Filz } 22363f7a87d2SFrank Filz } 22373f7a87d2SFrank Filz 22381da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 22391da177e4SLinus Torvalds * order. 22401da177e4SLinus Torvalds */ 22411da177e4SLinus Torvalds asoc->peer.i.init_tag = 22421da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 22431da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 22441da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 22451da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 22461da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 22471da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 22481da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 22491da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 22501da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 22511da177e4SLinus Torvalds 22521da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 22531da177e4SLinus Torvalds * number of inbound streams. 22541da177e4SLinus Torvalds */ 22551da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 22561da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 22571da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 22581da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 22591da177e4SLinus Torvalds } 22601da177e4SLinus Torvalds 22611da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 22621da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 22631da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 22641da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 22651da177e4SLinus Torvalds } 22661da177e4SLinus Torvalds 22671da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 22681da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 22691da177e4SLinus Torvalds 22701da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 22711da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 22721da177e4SLinus Torvalds 22731da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 22741da177e4SLinus Torvalds cookie = asoc->peer.cookie; 22751da177e4SLinus Torvalds if (cookie) { 2276af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 22771da177e4SLinus Torvalds if (!asoc->peer.cookie) 22781da177e4SLinus Torvalds goto clean_up; 22791da177e4SLinus Torvalds } 22801da177e4SLinus Torvalds 22811da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 22821da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 22831da177e4SLinus Torvalds * advertised window). 22841da177e4SLinus Torvalds */ 22859dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 22869dbc15f0SRobert P. J. Day transports) { 22871da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 22881da177e4SLinus Torvalds } 22891da177e4SLinus Torvalds 22901da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 22911da177e4SLinus Torvalds sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE, 22921da177e4SLinus Torvalds asoc->peer.i.initial_tsn); 22931da177e4SLinus Torvalds 22941da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 22951da177e4SLinus Torvalds * 22961da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 22971da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 22981da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 22991da177e4SLinus Torvalds * stream sequence number shall be set to 0. 23001da177e4SLinus Torvalds */ 23011da177e4SLinus Torvalds 23023f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 23033f7a87d2SFrank Filz * association. 23041da177e4SLinus Torvalds */ 23051da177e4SLinus Torvalds if (!asoc->temp) { 23061da177e4SLinus Torvalds int error; 23071da177e4SLinus Torvalds 23081da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 23091da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 23101da177e4SLinus Torvalds if (!asoc->ssnmap) 23111da177e4SLinus Torvalds goto clean_up; 23121da177e4SLinus Torvalds 231307d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 231407d93967SVlad Yasevich if (error) 23151da177e4SLinus Torvalds goto clean_up; 23161da177e4SLinus Torvalds } 23171da177e4SLinus Torvalds 23181da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 23191da177e4SLinus Torvalds * 23201da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 23211da177e4SLinus Torvalds * remote endpoint it should do the following: 23221da177e4SLinus Torvalds * ... 23231da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 23241da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 23251da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 23261da177e4SLinus Torvalds * association to the same value as the Initial TSN. 23271da177e4SLinus Torvalds */ 23281da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 23291da177e4SLinus Torvalds return 1; 23301da177e4SLinus Torvalds 23311da177e4SLinus Torvalds clean_up: 23321da177e4SLinus Torvalds /* Release the transport structures. */ 23331da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23341da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2335add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2336add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 23371da177e4SLinus Torvalds } 23383f7a87d2SFrank Filz 23391da177e4SLinus Torvalds nomem: 23401da177e4SLinus Torvalds return 0; 23411da177e4SLinus Torvalds } 23421da177e4SLinus Torvalds 23431da177e4SLinus Torvalds 23441da177e4SLinus Torvalds /* Update asoc with the option described in param. 23451da177e4SLinus Torvalds * 23461da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 23471da177e4SLinus Torvalds * 23481da177e4SLinus Torvalds * asoc is the association to update. 23491da177e4SLinus Torvalds * param is the variable length parameter to use for update. 23501da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 23511da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 23521da177e4SLinus Torvalds * work we do. In particular, we should not build transport 23531da177e4SLinus Torvalds * structures for the addresses. 23541da177e4SLinus Torvalds */ 23551da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 23561da177e4SLinus Torvalds union sctp_params param, 23571da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2358dd0fc66fSAl Viro gfp_t gfp) 23591da177e4SLinus Torvalds { 23601da177e4SLinus Torvalds union sctp_addr addr; 23611da177e4SLinus Torvalds int i; 23621da177e4SLinus Torvalds __u16 sat; 23631da177e4SLinus Torvalds int retval = 1; 23641da177e4SLinus Torvalds sctp_scope_t scope; 23651da177e4SLinus Torvalds time_t stale; 23661da177e4SLinus Torvalds struct sctp_af *af; 2367d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2368d6de3097SVlad Yasevich struct sctp_transport *t; 23691da177e4SLinus Torvalds 23701da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 23711da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 23721da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 23731da177e4SLinus Torvalds */ 23741da177e4SLinus Torvalds switch (param.p->type) { 23751da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 23761da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 23771da177e4SLinus Torvalds break; 23787dab83deSVlad Yasevich goto do_addr_param; 23797dab83deSVlad Yasevich 23801da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 23817dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 23827dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 23837dab83deSVlad Yasevich break; 23847dab83deSVlad Yasevich do_addr_param: 23851da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2386dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 23871da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2388dd86d136SAl Viro if (sctp_in_scope(&addr, scope)) 2389dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 23901da177e4SLinus Torvalds return 0; 23911da177e4SLinus Torvalds break; 23921da177e4SLinus Torvalds 23931da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 23941da177e4SLinus Torvalds if (!sctp_cookie_preserve_enable) 23951da177e4SLinus Torvalds break; 23961da177e4SLinus Torvalds 23971da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 23981da177e4SLinus Torvalds 23991da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 24001da177e4SLinus Torvalds * (1/1000sec). 24011da177e4SLinus Torvalds */ 24021da177e4SLinus Torvalds asoc->cookie_life.tv_sec += stale / 1000; 24031da177e4SLinus Torvalds asoc->cookie_life.tv_usec += (stale % 1000) * 1000; 24041da177e4SLinus Torvalds break; 24051da177e4SLinus Torvalds 24061da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 24071da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n"); 24081da177e4SLinus Torvalds break; 24091da177e4SLinus Torvalds 24101da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 24111da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 24121da177e4SLinus Torvalds * ones are really set by the peer. 24131da177e4SLinus Torvalds */ 24141da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 24151da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 24161da177e4SLinus Torvalds 2417140ee960SGui Jianfeng /* Assume that peer supports the address family 2418140ee960SGui Jianfeng * by which it sends a packet. 2419140ee960SGui Jianfeng */ 2420140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2421140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2422140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2423140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2424140ee960SGui Jianfeng 24251da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 24261da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 24271da177e4SLinus Torvalds if (sat) 24281da177e4SLinus Torvalds sat /= sizeof(__u16); 24291da177e4SLinus Torvalds 24301da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 24311da177e4SLinus Torvalds switch (param.sat->types[i]) { 24321da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 24331da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 24341da177e4SLinus Torvalds break; 24351da177e4SLinus Torvalds 24361da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 24376e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 24381da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 24391da177e4SLinus Torvalds break; 24401da177e4SLinus Torvalds 24411da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 24421da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 24431da177e4SLinus Torvalds break; 24441da177e4SLinus Torvalds 24451da177e4SLinus Torvalds default: /* Just ignore anything else. */ 24461da177e4SLinus Torvalds break; 24473ff50b79SStephen Hemminger } 24481da177e4SLinus Torvalds } 24491da177e4SLinus Torvalds break; 24501da177e4SLinus Torvalds 24511da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 24521da177e4SLinus Torvalds asoc->peer.cookie_len = 24531da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 24541da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 24551da177e4SLinus Torvalds break; 24561da177e4SLinus Torvalds 24571da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 24581da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 24591da177e4SLinus Torvalds break; 24601da177e4SLinus Torvalds 24611da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 24621da177e4SLinus Torvalds /* Rejected during verify stage. */ 24631da177e4SLinus Torvalds break; 24641da177e4SLinus Torvalds 24651da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 24661da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 24671da177e4SLinus Torvalds break; 24681da177e4SLinus Torvalds 24690f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 24700f3fffd8SIvan Skytte Jorgensen asoc->peer.adaptation_ind = param.aind->adaptation_ind; 24711da177e4SLinus Torvalds break; 24721da177e4SLinus Torvalds 2473d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 24740ef46e28SVlad Yasevich if (!sctp_addip_enable) 24750ef46e28SVlad Yasevich goto fall_through; 24760ef46e28SVlad Yasevich 2477d6de3097SVlad Yasevich addr_param = param.v + sizeof(sctp_addip_param_t); 2478d6de3097SVlad Yasevich 2479d6de3097SVlad Yasevich af = sctp_get_af_specific(param_type2af(param.p->type)); 2480d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2481d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2482d6de3097SVlad Yasevich 2483d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2484d6de3097SVlad Yasevich * XXX: see spec for what to do. 2485d6de3097SVlad Yasevich */ 2486d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2487d6de3097SVlad Yasevich break; 2488d6de3097SVlad Yasevich 2489d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2490d6de3097SVlad Yasevich if (!t) 2491d6de3097SVlad Yasevich break; 2492d6de3097SVlad Yasevich 2493d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2494d6de3097SVlad Yasevich break; 2495d6de3097SVlad Yasevich 2496131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2497131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2498131a47e3SVlad Yasevich break; 2499131a47e3SVlad Yasevich 25001da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 25011da177e4SLinus Torvalds if (sctp_prsctp_enable) { 25021da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 25031da177e4SLinus Torvalds break; 25041da177e4SLinus Torvalds } 25051da177e4SLinus Torvalds /* Fall Through */ 2506730fc3d0SVlad Yasevich goto fall_through; 2507730fc3d0SVlad Yasevich 2508730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2509730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2510730fc3d0SVlad Yasevich goto fall_through; 2511730fc3d0SVlad Yasevich 2512730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2513730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2514730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2515730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2516730fc3d0SVlad Yasevich retval = 0; 2517730fc3d0SVlad Yasevich break; 2518730fc3d0SVlad Yasevich } 2519730fc3d0SVlad Yasevich break; 2520730fc3d0SVlad Yasevich 2521730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2522730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2523730fc3d0SVlad Yasevich goto fall_through; 2524730fc3d0SVlad Yasevich 2525730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2526730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2527730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2528730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2529730fc3d0SVlad Yasevich retval = 0; 2530730fc3d0SVlad Yasevich break; 2531730fc3d0SVlad Yasevich } 2532730fc3d0SVlad Yasevich 2533730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2534730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2535730fc3d0SVlad Yasevich break; 2536730fc3d0SVlad Yasevich 2537730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2538730fc3d0SVlad Yasevich if (!sctp_auth_enable) 2539730fc3d0SVlad Yasevich goto fall_through; 2540730fc3d0SVlad Yasevich 2541730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2542730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2543730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2544730fc3d0SVlad Yasevich retval = 0; 2545730fc3d0SVlad Yasevich break; 2546730fc3d0SVlad Yasevich fall_through: 25471da177e4SLinus Torvalds default: 25481da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 25491da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 25501da177e4SLinus Torvalds * called prior to this routine. Simply log the error 25511da177e4SLinus Torvalds * here. 25521da177e4SLinus Torvalds */ 25531da177e4SLinus Torvalds SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n", 25541da177e4SLinus Torvalds ntohs(param.p->type), asoc); 25551da177e4SLinus Torvalds break; 25563ff50b79SStephen Hemminger } 25571da177e4SLinus Torvalds 25581da177e4SLinus Torvalds return retval; 25591da177e4SLinus Torvalds } 25601da177e4SLinus Torvalds 25611da177e4SLinus Torvalds /* Select a new verification tag. */ 25621da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 25631da177e4SLinus Torvalds { 25641da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 25651da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 25661da177e4SLinus Torvalds */ 25671da177e4SLinus Torvalds __u32 x; 25681da177e4SLinus Torvalds 25691da177e4SLinus Torvalds do { 25701da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 25711da177e4SLinus Torvalds } while (x == 0); 25721da177e4SLinus Torvalds 25731da177e4SLinus Torvalds return x; 25741da177e4SLinus Torvalds } 25751da177e4SLinus Torvalds 25761da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 25771da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 25781da177e4SLinus Torvalds { 25791da177e4SLinus Torvalds __u32 retval; 25801da177e4SLinus Torvalds 25811da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 25821da177e4SLinus Torvalds return retval; 25831da177e4SLinus Torvalds } 25841da177e4SLinus Torvalds 25851da177e4SLinus Torvalds /* 25861da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 25871da177e4SLinus Torvalds * 0 1 2 3 25881da177e4SLinus 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 25891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25901da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 25911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25921da177e4SLinus Torvalds * | Serial Number | 25931da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25941da177e4SLinus Torvalds * | Address Parameter | 25951da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25961da177e4SLinus Torvalds * | ASCONF Parameter #1 | 25971da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25981da177e4SLinus Torvalds * \ \ 25991da177e4SLinus Torvalds * / .... / 26001da177e4SLinus Torvalds * \ \ 26011da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26021da177e4SLinus Torvalds * | ASCONF Parameter #N | 26031da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26041da177e4SLinus Torvalds * 26051da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 26061da177e4SLinus Torvalds */ 26071da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 26081da177e4SLinus Torvalds union sctp_addr *addr, 26091da177e4SLinus Torvalds int vparam_len) 26101da177e4SLinus Torvalds { 26111da177e4SLinus Torvalds sctp_addiphdr_t asconf; 26121da177e4SLinus Torvalds struct sctp_chunk *retval; 26131da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 26141da177e4SLinus Torvalds union sctp_addr_param addrparam; 26151da177e4SLinus Torvalds int addrlen; 26161da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 26171da177e4SLinus Torvalds 26181da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 26191da177e4SLinus Torvalds if (!addrlen) 26201da177e4SLinus Torvalds return NULL; 26211da177e4SLinus Torvalds length += addrlen; 26221da177e4SLinus Torvalds 26231da177e4SLinus Torvalds /* Create the chunk. */ 26241da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length); 26251da177e4SLinus Torvalds if (!retval) 26261da177e4SLinus Torvalds return NULL; 26271da177e4SLinus Torvalds 26281da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 26291da177e4SLinus Torvalds 26301da177e4SLinus Torvalds retval->subh.addip_hdr = 26311da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 26321da177e4SLinus Torvalds retval->param_hdr.v = 26331da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 26341da177e4SLinus Torvalds 26351da177e4SLinus Torvalds return retval; 26361da177e4SLinus Torvalds } 26371da177e4SLinus Torvalds 26381da177e4SLinus Torvalds /* ADDIP 26391da177e4SLinus Torvalds * 3.2.1 Add IP Address 26401da177e4SLinus Torvalds * 0 1 2 3 26411da177e4SLinus 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 26421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26431da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 26441da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26451da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 26461da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26471da177e4SLinus Torvalds * | Address Parameter | 26481da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26491da177e4SLinus Torvalds * 26501da177e4SLinus Torvalds * 3.2.2 Delete IP Address 26511da177e4SLinus Torvalds * 0 1 2 3 26521da177e4SLinus 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 26531da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26541da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 26551da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26561da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 26571da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26581da177e4SLinus Torvalds * | Address Parameter | 26591da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26601da177e4SLinus Torvalds * 26611da177e4SLinus Torvalds */ 26621da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 26631da177e4SLinus Torvalds union sctp_addr *laddr, 26641da177e4SLinus Torvalds struct sockaddr *addrs, 26651da177e4SLinus Torvalds int addrcnt, 2666dbc16db1SAl Viro __be16 flags) 26671da177e4SLinus Torvalds { 26681da177e4SLinus Torvalds sctp_addip_param_t param; 26691da177e4SLinus Torvalds struct sctp_chunk *retval; 26701da177e4SLinus Torvalds union sctp_addr_param addr_param; 26711da177e4SLinus Torvalds union sctp_addr *addr; 26721da177e4SLinus Torvalds void *addr_buf; 26731da177e4SLinus Torvalds struct sctp_af *af; 26741da177e4SLinus Torvalds int paramlen = sizeof(param); 26751da177e4SLinus Torvalds int addr_param_len = 0; 26761da177e4SLinus Torvalds int totallen = 0; 26771da177e4SLinus Torvalds int i; 26781da177e4SLinus Torvalds 26791da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 26801da177e4SLinus Torvalds addr_buf = addrs; 26811da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 26821da177e4SLinus Torvalds addr = (union sctp_addr *)addr_buf; 26831da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 26841da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 26851da177e4SLinus Torvalds 26861da177e4SLinus Torvalds totallen += paramlen; 26871da177e4SLinus Torvalds totallen += addr_param_len; 26881da177e4SLinus Torvalds 26891da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 26901da177e4SLinus Torvalds } 26911da177e4SLinus Torvalds 26921da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 26931da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 26941da177e4SLinus Torvalds if (!retval) 26951da177e4SLinus Torvalds return NULL; 26961da177e4SLinus Torvalds 26971da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 26981da177e4SLinus Torvalds addr_buf = addrs; 26991da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 27001da177e4SLinus Torvalds addr = (union sctp_addr *)addr_buf; 27011da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 27021da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 27031da177e4SLinus Torvalds param.param_hdr.type = flags; 27041da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 27051da177e4SLinus Torvalds param.crr_id = i; 27061da177e4SLinus Torvalds 27071da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 27081da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 27091da177e4SLinus Torvalds 27101da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 27111da177e4SLinus Torvalds } 27121da177e4SLinus Torvalds return retval; 27131da177e4SLinus Torvalds } 27141da177e4SLinus Torvalds 27151da177e4SLinus Torvalds /* ADDIP 27161da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 27171da177e4SLinus Torvalds * 0 1 2 3 27181da177e4SLinus Torvalds * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 27191da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27201da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 27211da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27221da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27231da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27241da177e4SLinus Torvalds * | Address Parameter | 27251da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27261da177e4SLinus Torvalds * 27271da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 27281da177e4SLinus Torvalds */ 27291da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 27301da177e4SLinus Torvalds union sctp_addr *addr) 27311da177e4SLinus Torvalds { 27321da177e4SLinus Torvalds sctp_addip_param_t param; 27331da177e4SLinus Torvalds struct sctp_chunk *retval; 27341da177e4SLinus Torvalds int len = sizeof(param); 27351da177e4SLinus Torvalds union sctp_addr_param addrparam; 27361da177e4SLinus Torvalds int addrlen; 27371da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27381da177e4SLinus Torvalds 27391da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27401da177e4SLinus Torvalds if (!addrlen) 27411da177e4SLinus Torvalds return NULL; 27421da177e4SLinus Torvalds len += addrlen; 27431da177e4SLinus Torvalds 27441da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 27451da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 27461da177e4SLinus Torvalds if (!retval) 27471da177e4SLinus Torvalds return NULL; 27481da177e4SLinus Torvalds 27491da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 27501da177e4SLinus Torvalds param.param_hdr.length = htons(len); 27511da177e4SLinus Torvalds param.crr_id = 0; 27521da177e4SLinus Torvalds 27531da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 27541da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27551da177e4SLinus Torvalds 27561da177e4SLinus Torvalds return retval; 27571da177e4SLinus Torvalds } 27581da177e4SLinus Torvalds 27591da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 27601da177e4SLinus Torvalds * 0 1 2 3 27611da177e4SLinus 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 27621da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27631da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 27641da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27651da177e4SLinus Torvalds * | Serial Number | 27661da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27671da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 27681da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27691da177e4SLinus Torvalds * \ \ 27701da177e4SLinus Torvalds * / .... / 27711da177e4SLinus Torvalds * \ \ 27721da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27731da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 27741da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27751da177e4SLinus Torvalds * 27761da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 27771da177e4SLinus Torvalds */ 27781da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 27791da177e4SLinus Torvalds __u32 serial, int vparam_len) 27801da177e4SLinus Torvalds { 27811da177e4SLinus Torvalds sctp_addiphdr_t asconf; 27821da177e4SLinus Torvalds struct sctp_chunk *retval; 27831da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27841da177e4SLinus Torvalds 27851da177e4SLinus Torvalds /* Create the chunk. */ 27861da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length); 27871da177e4SLinus Torvalds if (!retval) 27881da177e4SLinus Torvalds return NULL; 27891da177e4SLinus Torvalds 27901da177e4SLinus Torvalds asconf.serial = htonl(serial); 27911da177e4SLinus Torvalds 27921da177e4SLinus Torvalds retval->subh.addip_hdr = 27931da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27941da177e4SLinus Torvalds 27951da177e4SLinus Torvalds return retval; 27961da177e4SLinus Torvalds } 27971da177e4SLinus Torvalds 27981da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 27999f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2800dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 28011da177e4SLinus Torvalds { 28021da177e4SLinus Torvalds sctp_addip_param_t ack_param; 28031da177e4SLinus Torvalds sctp_errhdr_t err_param; 28041da177e4SLinus Torvalds int asconf_param_len = 0; 28051da177e4SLinus Torvalds int err_param_len = 0; 2806dbc16db1SAl Viro __be16 response_type; 28071da177e4SLinus Torvalds 28081da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 28091da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 28101da177e4SLinus Torvalds } else { 28111da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 28121da177e4SLinus Torvalds err_param_len = sizeof(err_param); 28131da177e4SLinus Torvalds if (asconf_param) 28141da177e4SLinus Torvalds asconf_param_len = 28151da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 28161da177e4SLinus Torvalds } 28171da177e4SLinus Torvalds 28181da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 28191da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 28201da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 28211da177e4SLinus Torvalds err_param_len + 28221da177e4SLinus Torvalds asconf_param_len); 28231da177e4SLinus Torvalds ack_param.crr_id = crr_id; 28241da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 28251da177e4SLinus Torvalds 28261da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 28271da177e4SLinus Torvalds return; 28281da177e4SLinus Torvalds 28291da177e4SLinus Torvalds /* Add Error Cause parameter. */ 28301da177e4SLinus Torvalds err_param.cause = err_code; 28311da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 28321da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 28331da177e4SLinus Torvalds 28341da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 28351da177e4SLinus Torvalds if (asconf_param) 28361da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 28371da177e4SLinus Torvalds } 28381da177e4SLinus Torvalds 28391da177e4SLinus Torvalds /* Process a asconf parameter. */ 2840dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 28411da177e4SLinus Torvalds struct sctp_chunk *asconf, 28421da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 28431da177e4SLinus Torvalds { 28441da177e4SLinus Torvalds struct sctp_transport *peer; 28451da177e4SLinus Torvalds struct sctp_af *af; 28461da177e4SLinus Torvalds union sctp_addr addr; 28471da177e4SLinus Torvalds union sctp_addr_param *addr_param; 28481da177e4SLinus Torvalds 2849c1cc678aSPatrick McHardy addr_param = (union sctp_addr_param *) 2850c1cc678aSPatrick McHardy ((void *)asconf_param + sizeof(sctp_addip_param_t)); 2851c1cc678aSPatrick McHardy 2852c4492586SWei Yongjun switch (addr_param->v4.param_hdr.type) { 2853c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 2854c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 2855c4492586SWei Yongjun return SCTP_ERROR_INV_PARAM; 2856c4492586SWei Yongjun break; 2857c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 2858c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 2859c4492586SWei Yongjun return SCTP_ERROR_INV_PARAM; 2860c4492586SWei Yongjun break; 2861c4492586SWei Yongjun default: 2862c4492586SWei Yongjun return SCTP_ERROR_INV_PARAM; 2863c4492586SWei Yongjun } 2864c4492586SWei Yongjun 28651da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); 28661da177e4SLinus Torvalds if (unlikely(!af)) 28671da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 28681da177e4SLinus Torvalds 2869dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 287042e30bf3SVlad Yasevich 287142e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 287242e30bf3SVlad Yasevich * or multicast address. 287342e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 287442e30bf3SVlad Yasevich * make sure we check for that) 287542e30bf3SVlad Yasevich */ 287642e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 287742e30bf3SVlad Yasevich return SCTP_ERROR_INV_PARAM; 287842e30bf3SVlad Yasevich 28791da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 28801da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 288142e30bf3SVlad Yasevich /* Section 4.2.1: 288242e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 288342e30bf3SVlad Yasevich * address of the packet MUST be added. 288442e30bf3SVlad Yasevich */ 288542e30bf3SVlad Yasevich if (af->is_any(&addr)) 288642e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 288742e30bf3SVlad Yasevich 28881da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 28891da177e4SLinus Torvalds * request and does not have the local resources to add this 28901da177e4SLinus Torvalds * new address to the association, it MUST return an Error 28911da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 28921da177e4SLinus Torvalds * Due to Resource Shortage'. 28931da177e4SLinus Torvalds */ 28941da177e4SLinus Torvalds 2895dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 28961da177e4SLinus Torvalds if (!peer) 28971da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 28981da177e4SLinus Torvalds 28991da177e4SLinus Torvalds /* Start the heartbeat timer. */ 29001da177e4SLinus Torvalds if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) 29011da177e4SLinus Torvalds sctp_transport_hold(peer); 29021da177e4SLinus Torvalds break; 29031da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 29041da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 29051da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 29061da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 29071da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 29081da177e4SLinus Torvalds */ 290942e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 29101da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 29111da177e4SLinus Torvalds 29121da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 29131da177e4SLinus Torvalds * address which is also the source address of the IP packet 29141da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 29151da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 29161da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 29171da177e4SLinus Torvalds * Delete Source IP Address' 29181da177e4SLinus Torvalds */ 29196a1e5f33SAl Viro if (sctp_cmp_addr_exact(sctp_source(asconf), &addr)) 29201da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 29211da177e4SLinus Torvalds 292242e30bf3SVlad Yasevich /* Section 4.2.2 292342e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 292442e30bf3SVlad Yasevich * addresses of the peer except the source address of the 292542e30bf3SVlad Yasevich * packet MUST be deleted. 292642e30bf3SVlad Yasevich */ 292742e30bf3SVlad Yasevich if (af->is_any(&addr)) { 292842e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 292942e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 293042e30bf3SVlad Yasevich asconf->transport); 293142e30bf3SVlad Yasevich } else 2932dd86d136SAl Viro sctp_assoc_del_peer(asoc, &addr); 29331da177e4SLinus Torvalds break; 29341da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 293542e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 293642e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 293742e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 293842e30bf3SVlad Yasevich * primary. 293942e30bf3SVlad Yasevich */ 294042e30bf3SVlad Yasevich if (af->is_any(&addr)) 294142e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 294242e30bf3SVlad Yasevich 2943dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 29441da177e4SLinus Torvalds if (!peer) 29451da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 29461da177e4SLinus Torvalds 29471da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 29481da177e4SLinus Torvalds break; 29491da177e4SLinus Torvalds default: 29501da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 29511da177e4SLinus Torvalds break; 29521da177e4SLinus Torvalds } 29531da177e4SLinus Torvalds 29541da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 29551da177e4SLinus Torvalds } 29561da177e4SLinus Torvalds 29576f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 29586f4c618dSWei Yongjun int sctp_verify_asconf(const struct sctp_association *asoc, 29596f4c618dSWei Yongjun struct sctp_paramhdr *param_hdr, void *chunk_end, 29606f4c618dSWei Yongjun struct sctp_paramhdr **errp) { 29616f4c618dSWei Yongjun sctp_addip_param_t *asconf_param; 29626f4c618dSWei Yongjun union sctp_params param; 29636f4c618dSWei Yongjun int length, plen; 29646f4c618dSWei Yongjun 29656f4c618dSWei Yongjun param.v = (sctp_paramhdr_t *) param_hdr; 29666f4c618dSWei Yongjun while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) { 29676f4c618dSWei Yongjun length = ntohs(param.p->length); 29686f4c618dSWei Yongjun *errp = param.p; 29696f4c618dSWei Yongjun 29706f4c618dSWei Yongjun if (param.v > chunk_end - length || 29716f4c618dSWei Yongjun length < sizeof(sctp_paramhdr_t)) 29726f4c618dSWei Yongjun return 0; 29736f4c618dSWei Yongjun 29746f4c618dSWei Yongjun switch (param.p->type) { 29756f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 29766f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 29776f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 29786f4c618dSWei Yongjun asconf_param = (sctp_addip_param_t *)param.v; 29796f4c618dSWei Yongjun plen = ntohs(asconf_param->param_hdr.length); 29806f4c618dSWei Yongjun if (plen < sizeof(sctp_addip_param_t) + 29816f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 29826f4c618dSWei Yongjun return 0; 29836f4c618dSWei Yongjun break; 29846f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 29856f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 29866f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 29876f4c618dSWei Yongjun return 0; 29886f4c618dSWei Yongjun 29896f4c618dSWei Yongjun break; 29906f4c618dSWei Yongjun default: 29916f4c618dSWei Yongjun break; 29926f4c618dSWei Yongjun } 29936f4c618dSWei Yongjun 29946f4c618dSWei Yongjun param.v += WORD_ROUND(length); 29956f4c618dSWei Yongjun } 29966f4c618dSWei Yongjun 29976f4c618dSWei Yongjun if (param.v != chunk_end) 29986f4c618dSWei Yongjun return 0; 29996f4c618dSWei Yongjun 30006f4c618dSWei Yongjun return 1; 30016f4c618dSWei Yongjun } 30026f4c618dSWei Yongjun 30031da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 30041da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 30051da177e4SLinus Torvalds */ 30061da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 30071da177e4SLinus Torvalds struct sctp_chunk *asconf) 30081da177e4SLinus Torvalds { 30091da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 30101da177e4SLinus Torvalds union sctp_addr_param *addr_param; 30111da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 30121da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 30131da177e4SLinus Torvalds 3014dbc16db1SAl Viro __be16 err_code; 30151da177e4SLinus Torvalds int length = 0; 3016f3830cccSWei Yongjun int chunk_len; 30171da177e4SLinus Torvalds __u32 serial; 30181da177e4SLinus Torvalds int all_param_pass = 1; 30191da177e4SLinus Torvalds 3020f3830cccSWei Yongjun chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); 30211da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 30221da177e4SLinus Torvalds serial = ntohl(hdr->serial); 30231da177e4SLinus Torvalds 30241da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 30251da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 30261da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 30271da177e4SLinus Torvalds chunk_len -= length; 30281da177e4SLinus Torvalds 30291da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 30307aa1b54bSJoe Perches * asconf parameter. 30311da177e4SLinus Torvalds */ 30321da177e4SLinus Torvalds length = ntohs(addr_param->v4.param_hdr.length); 30331da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); 30341da177e4SLinus Torvalds chunk_len -= length; 30351da177e4SLinus Torvalds 30361da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 30371da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 30381da177e4SLinus Torvalds * ASCONF_ACK parameters are less than or equal to the twice of ASCONF 30397aa1b54bSJoe Perches * parameters. 30401da177e4SLinus Torvalds */ 30411da177e4SLinus Torvalds asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2); 30421da177e4SLinus Torvalds if (!asconf_ack) 30431da177e4SLinus Torvalds goto done; 30441da177e4SLinus Torvalds 30451da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 30461da177e4SLinus Torvalds while (chunk_len > 0) { 30471da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 30481da177e4SLinus Torvalds asconf_param); 30491da177e4SLinus Torvalds /* ADDIP 4.1 A7) 30501da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 30511da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 30521da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 30531da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 30541da177e4SLinus Torvalds * a specific success indication is present for the parameter. 30551da177e4SLinus Torvalds */ 30561da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR != err_code) 30571da177e4SLinus Torvalds all_param_pass = 0; 30581da177e4SLinus Torvalds 30591da177e4SLinus Torvalds if (!all_param_pass) 30601da177e4SLinus Torvalds sctp_add_asconf_response(asconf_ack, 30611da177e4SLinus Torvalds asconf_param->crr_id, err_code, 30621da177e4SLinus Torvalds asconf_param); 30631da177e4SLinus Torvalds 30641da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 30651da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 30661da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 30671da177e4SLinus Torvalds * in the ASCONF. 30681da177e4SLinus Torvalds */ 30691da177e4SLinus Torvalds if (SCTP_ERROR_RSRC_LOW == err_code) 30701da177e4SLinus Torvalds goto done; 30711da177e4SLinus Torvalds 30721da177e4SLinus Torvalds /* Move to the next ASCONF param. */ 30731da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 30741da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)asconf_param + 30751da177e4SLinus Torvalds length); 30761da177e4SLinus Torvalds chunk_len -= length; 30771da177e4SLinus Torvalds } 30781da177e4SLinus Torvalds 30791da177e4SLinus Torvalds done: 30801da177e4SLinus Torvalds asoc->peer.addip_serial++; 30811da177e4SLinus Torvalds 30821da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 30831da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 30841da177e4SLinus Torvalds */ 30851da177e4SLinus Torvalds if (asconf_ack) { 30861da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3087a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3088a08de64dSVlad Yasevich &asoc->asconf_ack_list); 30891da177e4SLinus Torvalds } 30901da177e4SLinus Torvalds 30911da177e4SLinus Torvalds return asconf_ack; 30921da177e4SLinus Torvalds } 30931da177e4SLinus Torvalds 30941da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 30951da177e4SLinus Torvalds static int sctp_asconf_param_success(struct sctp_association *asoc, 30961da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 30971da177e4SLinus Torvalds { 30981da177e4SLinus Torvalds struct sctp_af *af; 30991da177e4SLinus Torvalds union sctp_addr addr; 31001da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 31011da177e4SLinus Torvalds union sctp_addr_param *addr_param; 31021da177e4SLinus Torvalds struct sctp_transport *transport; 3103dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 31041da177e4SLinus Torvalds int retval = 0; 31051da177e4SLinus Torvalds 31061da177e4SLinus Torvalds addr_param = (union sctp_addr_param *) 31071da177e4SLinus Torvalds ((void *)asconf_param + sizeof(sctp_addip_param_t)); 31081da177e4SLinus Torvalds 31091da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 31101da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type)); 3111dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 31121da177e4SLinus Torvalds 31131da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 31141da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3115559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3116559cf710SVlad Yasevich * held, so the list can not change. 3117559cf710SVlad Yasevich */ 31180ed90fb0SVlad Yasevich local_bh_disable(); 3119559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3120dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3121f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3122dc022a98SSridhar Samudrala } 31230ed90fb0SVlad Yasevich local_bh_enable(); 31241da177e4SLinus Torvalds break; 31251da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 31260ed90fb0SVlad Yasevich local_bh_disable(); 31270ed90fb0SVlad Yasevich retval = sctp_del_bind_addr(bp, &addr); 31280ed90fb0SVlad Yasevich local_bh_enable(); 31299dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 31309dbc15f0SRobert P. J. Day transports) { 3131dc022a98SSridhar Samudrala dst_release(transport->dst); 31321da177e4SLinus Torvalds sctp_transport_route(transport, NULL, 31331da177e4SLinus Torvalds sctp_sk(asoc->base.sk)); 31341da177e4SLinus Torvalds } 31351da177e4SLinus Torvalds break; 31361da177e4SLinus Torvalds default: 31371da177e4SLinus Torvalds break; 31381da177e4SLinus Torvalds } 31391da177e4SLinus Torvalds 31401da177e4SLinus Torvalds return retval; 31411da177e4SLinus Torvalds } 31421da177e4SLinus Torvalds 31431da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 31441da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 31451da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 31461da177e4SLinus Torvalds * ADDIP 4.1 31471da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 31481da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 31491da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 31501da177e4SLinus Torvalds * specific success indication is present for the parameter. 31511da177e4SLinus Torvalds */ 3152dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 31531da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 31541da177e4SLinus Torvalds int no_err) 31551da177e4SLinus Torvalds { 31561da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 31571da177e4SLinus Torvalds sctp_errhdr_t *err_param; 31581da177e4SLinus Torvalds int length; 3159f3830cccSWei Yongjun int asconf_ack_len; 3160dbc16db1SAl Viro __be16 err_code; 31611da177e4SLinus Torvalds 31621da177e4SLinus Torvalds if (no_err) 31631da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 31641da177e4SLinus Torvalds else 31651da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 31661da177e4SLinus Torvalds 3167f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3168f3830cccSWei Yongjun sizeof(sctp_chunkhdr_t); 3169f3830cccSWei Yongjun 31701da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 31711da177e4SLinus Torvalds * the first asconf_ack parameter. 31721da177e4SLinus Torvalds */ 31731da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 31741da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 31751da177e4SLinus Torvalds length); 31761da177e4SLinus Torvalds asconf_ack_len -= length; 31771da177e4SLinus Torvalds 31781da177e4SLinus Torvalds while (asconf_ack_len > 0) { 31791da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 31801da177e4SLinus Torvalds switch(asconf_ack_param->param_hdr.type) { 31811da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 31821da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31831da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 31841da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 31851da177e4SLinus Torvalds err_param = (sctp_errhdr_t *) 31861da177e4SLinus Torvalds ((void *)asconf_ack_param + length); 31871da177e4SLinus Torvalds asconf_ack_len -= length; 31881da177e4SLinus Torvalds if (asconf_ack_len > 0) 31891da177e4SLinus Torvalds return err_param->cause; 31901da177e4SLinus Torvalds else 31911da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 31921da177e4SLinus Torvalds break; 31931da177e4SLinus Torvalds default: 31941da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 31951da177e4SLinus Torvalds } 31961da177e4SLinus Torvalds } 31971da177e4SLinus Torvalds 31981da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 31991da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *) 32001da177e4SLinus Torvalds ((void *)asconf_ack_param + length); 32011da177e4SLinus Torvalds asconf_ack_len -= length; 32021da177e4SLinus Torvalds } 32031da177e4SLinus Torvalds 32041da177e4SLinus Torvalds return err_code; 32051da177e4SLinus Torvalds } 32061da177e4SLinus Torvalds 32071da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 32081da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 32091da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 32101da177e4SLinus Torvalds { 32111da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 32121da177e4SLinus Torvalds union sctp_addr_param *addr_param; 32131da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 32141da177e4SLinus Torvalds int length = 0; 32151da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 32161da177e4SLinus Torvalds int all_param_pass = 0; 32171da177e4SLinus Torvalds int no_err = 1; 32181da177e4SLinus Torvalds int retval = 0; 3219dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 32201da177e4SLinus Torvalds 32211da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 32221da177e4SLinus Torvalds * a pointer to address parameter. 32231da177e4SLinus Torvalds */ 32241da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 32251da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 32261da177e4SLinus Torvalds asconf_len -= length; 32271da177e4SLinus Torvalds 32281da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 32297aa1b54bSJoe Perches * pointer to the first asconf parameter. 32301da177e4SLinus Torvalds */ 32311da177e4SLinus Torvalds length = ntohs(addr_param->v4.param_hdr.length); 32321da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)addr_param + length); 32331da177e4SLinus Torvalds asconf_len -= length; 32341da177e4SLinus Torvalds 32351da177e4SLinus Torvalds /* ADDIP 4.1 32361da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 32371da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 32381da177e4SLinus Torvalds * successful. 32391da177e4SLinus Torvalds */ 32401da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 32411da177e4SLinus Torvalds all_param_pass = 1; 32421da177e4SLinus Torvalds 32431da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 32441da177e4SLinus Torvalds while (asconf_len > 0) { 32451da177e4SLinus Torvalds if (all_param_pass) 32461da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 32471da177e4SLinus Torvalds else { 32481da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 32491da177e4SLinus Torvalds asconf_param, 32501da177e4SLinus Torvalds no_err); 32511da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 32521da177e4SLinus Torvalds no_err = 0; 32531da177e4SLinus Torvalds } 32541da177e4SLinus Torvalds 32551da177e4SLinus Torvalds switch (err_code) { 32561da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 32571da177e4SLinus Torvalds retval = sctp_asconf_param_success(asoc, asconf_param); 32581da177e4SLinus Torvalds break; 32591da177e4SLinus Torvalds 32601da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 32611da177e4SLinus Torvalds retval = 1; 32621da177e4SLinus Torvalds break; 32631da177e4SLinus Torvalds 32641da177e4SLinus Torvalds case SCTP_ERROR_INV_PARAM: 32651da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 32661da177e4SLinus Torvalds * future. 32671da177e4SLinus Torvalds */ 32681da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 32691da177e4SLinus Torvalds asconf_param->param_hdr.type; 32701da177e4SLinus Torvalds break; 32711da177e4SLinus Torvalds 32721da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 32731da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 32741da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 32751da177e4SLinus Torvalds default: 32761da177e4SLinus Torvalds break; 32771da177e4SLinus Torvalds } 32781da177e4SLinus Torvalds 32791da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 32801da177e4SLinus Torvalds * one. 32811da177e4SLinus Torvalds */ 32821da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 32831da177e4SLinus Torvalds asconf_param = (sctp_addip_param_t *)((void *)asconf_param + 32841da177e4SLinus Torvalds length); 32851da177e4SLinus Torvalds asconf_len -= length; 32861da177e4SLinus Torvalds } 32871da177e4SLinus Torvalds 32881da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 32895f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 32901da177e4SLinus Torvalds sctp_chunk_free(asconf); 32911da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 32921da177e4SLinus Torvalds 32931da177e4SLinus Torvalds /* Send the next asconf chunk from the addip chunk queue. */ 329479af02c2SDavid S. Miller if (!list_empty(&asoc->addip_chunk_list)) { 329579af02c2SDavid S. Miller struct list_head *entry = asoc->addip_chunk_list.next; 329679af02c2SDavid S. Miller asconf = list_entry(entry, struct sctp_chunk, list); 329779af02c2SDavid S. Miller 329879af02c2SDavid S. Miller list_del_init(entry); 329979af02c2SDavid S. Miller 33001da177e4SLinus Torvalds /* Hold the chunk until an ASCONF_ACK is received. */ 33011da177e4SLinus Torvalds sctp_chunk_hold(asconf); 33021da177e4SLinus Torvalds if (sctp_primitive_ASCONF(asoc, asconf)) 33031da177e4SLinus Torvalds sctp_chunk_free(asconf); 33041da177e4SLinus Torvalds else 33051da177e4SLinus Torvalds asoc->addip_last_asconf = asconf; 33061da177e4SLinus Torvalds } 33071da177e4SLinus Torvalds 33081da177e4SLinus Torvalds return retval; 33091da177e4SLinus Torvalds } 33101da177e4SLinus Torvalds 33111da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 33121da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 33131da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 33141da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 33151da177e4SLinus Torvalds { 33161da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 33171da177e4SLinus Torvalds struct sctp_fwdtsn_chunk *ftsn_chunk; 33181da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 33191da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 33201da177e4SLinus Torvalds size_t hint; 33211da177e4SLinus Torvalds int i; 33221da177e4SLinus Torvalds 33231da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 33241da177e4SLinus Torvalds 33251da177e4SLinus Torvalds retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint); 33261da177e4SLinus Torvalds 33271da177e4SLinus Torvalds if (!retval) 33281da177e4SLinus Torvalds return NULL; 33291da177e4SLinus Torvalds 33301da177e4SLinus Torvalds ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr; 33311da177e4SLinus Torvalds 33321da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 33331da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 33341da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 33351da177e4SLinus Torvalds 33361da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 33371da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 33381da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 33391da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 33401da177e4SLinus Torvalds } 33411da177e4SLinus Torvalds 33421da177e4SLinus Torvalds return retval; 33431da177e4SLinus Torvalds } 3344