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 264b2f13a2SJeff Kirsher * along with GNU CC; see the file COPYING. If not, see 274b2f13a2SJeff Kirsher * <http://www.gnu.org/licenses/>. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * Please send any bug reports or fixes you make to the 301da177e4SLinus Torvalds * email address(es): 3191705c61SDaniel Borkmann * lksctp developers <linux-sctp@vger.kernel.org> 321da177e4SLinus Torvalds * 331da177e4SLinus Torvalds * Written or modified by: 341da177e4SLinus Torvalds * La Monte H.P. Yarroll <piggy@acm.org> 351da177e4SLinus Torvalds * Karl Knutson <karl@athena.chicago.il.us> 361da177e4SLinus Torvalds * C. Robin <chris@hundredacre.ac.uk> 371da177e4SLinus Torvalds * Jon Grimm <jgrimm@us.ibm.com> 381da177e4SLinus Torvalds * Xingang Guo <xingang.guo@intel.com> 391da177e4SLinus Torvalds * Dajiang Zhang <dajiang.zhang@nokia.com> 401da177e4SLinus Torvalds * Sridhar Samudrala <sri@us.ibm.com> 411da177e4SLinus Torvalds * Daisy Chang <daisyc@us.ibm.com> 421da177e4SLinus Torvalds * Ardelle Fan <ardelle.fan@intel.com> 431da177e4SLinus Torvalds * Kevin Gao <kevin.gao@intel.com> 441da177e4SLinus Torvalds */ 451da177e4SLinus Torvalds 46145ce502SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 47145ce502SJoe Perches 485821c769SHerbert Xu #include <crypto/hash.h> 491da177e4SLinus Torvalds #include <linux/types.h> 501da177e4SLinus Torvalds #include <linux/kernel.h> 511da177e4SLinus Torvalds #include <linux/ip.h> 521da177e4SLinus Torvalds #include <linux/ipv6.h> 531da177e4SLinus Torvalds #include <linux/net.h> 541da177e4SLinus Torvalds #include <linux/inet.h> 55ebc3bbcfSChristian Borntraeger #include <linux/scatterlist.h> 565a0e3ad6STejun Heo #include <linux/slab.h> 571da177e4SLinus Torvalds #include <net/sock.h> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <linux/skbuff.h> 601da177e4SLinus Torvalds #include <linux/random.h> /* for get_random_bytes */ 611da177e4SLinus Torvalds #include <net/sctp/sctp.h> 621da177e4SLinus Torvalds #include <net/sctp/sm.h> 631da177e4SLinus Torvalds 64072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 65cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 66cea8768fSMarcelo Ricardo Leitner gfp_t gfp); 67072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 68cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp); 69072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 70cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 71cea8768fSMarcelo Ricardo Leitner gfp_t gfp); 721da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 731da177e4SLinus Torvalds const struct sctp_association *asoc, 741da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 751da177e4SLinus Torvalds int *cookie_len, 761da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 771da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 781da177e4SLinus Torvalds union sctp_params param, 791da177e4SLinus Torvalds const union sctp_addr *peer_addr, 80dd0fc66fSAl Viro gfp_t gfp); 818ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 828ee4be37SVlad Yasevich const void *data); 836daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, 846daaf0deSstephen hemminger const void *data); 851da177e4SLinus Torvalds 86072017b4SVlad Yasevich /* Control chunk destructor */ 87072017b4SVlad Yasevich static void sctp_control_release_owner(struct sk_buff *skb) 88072017b4SVlad Yasevich { 89072017b4SVlad Yasevich /*TODO: do memory release */ 90072017b4SVlad Yasevich } 91072017b4SVlad Yasevich 92072017b4SVlad Yasevich static void sctp_control_set_owner_w(struct sctp_chunk *chunk) 93072017b4SVlad Yasevich { 94072017b4SVlad Yasevich struct sctp_association *asoc = chunk->asoc; 95072017b4SVlad Yasevich struct sk_buff *skb = chunk->skb; 96072017b4SVlad Yasevich 97072017b4SVlad Yasevich /* TODO: properly account for control chunks. 98072017b4SVlad Yasevich * To do it right we'll need: 99072017b4SVlad Yasevich * 1) endpoint if association isn't known. 100072017b4SVlad Yasevich * 2) proper memory accounting. 101072017b4SVlad Yasevich * 102072017b4SVlad Yasevich * For now don't do anything for now. 103072017b4SVlad Yasevich */ 104072017b4SVlad Yasevich skb->sk = asoc ? asoc->base.sk : NULL; 105072017b4SVlad Yasevich skb->destructor = sctp_control_release_owner; 106072017b4SVlad Yasevich } 107072017b4SVlad Yasevich 1081da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 1091da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 1101da177e4SLinus Torvalds { 1111da177e4SLinus Torvalds struct sctp_af *af; 1121da177e4SLinus Torvalds int iif = 0; 1131da177e4SLinus Torvalds 114eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version)); 1151da177e4SLinus Torvalds if (af) 1161da177e4SLinus Torvalds iif = af->skb_iif(chunk->skb); 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds return iif; 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1221da177e4SLinus Torvalds * 1231da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1241da177e4SLinus Torvalds * Explicit Congestion Notification. 1251da177e4SLinus Torvalds */ 1261da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1271da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 12809640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1291da177e4SLinus Torvalds }; 1301da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1311da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 13209640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1331da177e4SLinus Torvalds }; 1341da177e4SLinus Torvalds 1355fa782c2SNeil Horman /* A helper to initialize an op error inside a 1361da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1371da177e4SLinus Torvalds * abort chunk. 1381da177e4SLinus Torvalds */ 1395bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 14000f1c2dfSWei Yongjun size_t paylen) 1411da177e4SLinus Torvalds { 1421da177e4SLinus Torvalds sctp_errhdr_t err; 1431da177e4SLinus Torvalds __u16 len; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1461da177e4SLinus Torvalds err.cause = cause_code; 1471da177e4SLinus Torvalds len = sizeof(sctp_errhdr_t) + paylen; 1481da177e4SLinus Torvalds err.length = htons(len); 1494a1c0107SVlad Yasevich chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err); 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1525fa782c2SNeil Horman /* A helper to initialize an op error inside a 1535fa782c2SNeil Horman * provided chunk, as most cause codes will be embedded inside an 1545fa782c2SNeil Horman * abort chunk. Differs from sctp_init_cause in that it won't oops 1555fa782c2SNeil Horman * if there isn't enough space in the op error chunk 1565fa782c2SNeil Horman */ 157db28aafaSIoan Orghici static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, 1585fa782c2SNeil Horman size_t paylen) 1595fa782c2SNeil Horman { 1605fa782c2SNeil Horman sctp_errhdr_t err; 1615fa782c2SNeil Horman __u16 len; 1625fa782c2SNeil Horman 1635fa782c2SNeil Horman /* Cause code constants are now defined in network order. */ 1645fa782c2SNeil Horman err.cause = cause_code; 1655fa782c2SNeil Horman len = sizeof(sctp_errhdr_t) + paylen; 1665fa782c2SNeil Horman err.length = htons(len); 1675fa782c2SNeil Horman 1682e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) < len) 1695fa782c2SNeil Horman return -ENOSPC; 1705fa782c2SNeil Horman chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, 1715fa782c2SNeil Horman sizeof(sctp_errhdr_t), 1725fa782c2SNeil Horman &err); 1735fa782c2SNeil Horman return 0; 1745fa782c2SNeil Horman } 1751da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1761da177e4SLinus Torvalds * 1771da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1781da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1791da177e4SLinus Torvalds * 1801da177e4SLinus Torvalds * 0 1 2 3 1811da177e4SLinus 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 1821da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1831da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1841da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1851da177e4SLinus Torvalds * | Initiate Tag | 1861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1871da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1881da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1891da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1901da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1911da177e4SLinus Torvalds * | Initial TSN | 1921da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1931da177e4SLinus Torvalds * \ \ 1941da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1951da177e4SLinus Torvalds * \ \ 1961da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1971da177e4SLinus Torvalds * 1981da177e4SLinus Torvalds * 1991da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 2001da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 2011da177e4SLinus Torvalds * 2021da177e4SLinus Torvalds * Fixed Parameters Status 2031da177e4SLinus Torvalds * ---------------------------------------------- 2041da177e4SLinus Torvalds * Initiate Tag Mandatory 2051da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 2061da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 2071da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 2081da177e4SLinus Torvalds * Initial TSN Mandatory 2091da177e4SLinus Torvalds * 2101da177e4SLinus Torvalds * Variable Parameters Status Type Value 2111da177e4SLinus Torvalds * ------------------------------------------------------------- 2121da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 2131da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 2141da177e4SLinus Torvalds * Cookie Preservative Optional 9 2151da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 2161da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 2171da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 2181da177e4SLinus Torvalds */ 2191da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 2201da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 221dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2221da177e4SLinus Torvalds { 223e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 224b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 2251da177e4SLinus Torvalds sctp_inithdr_t init; 2261da177e4SLinus Torvalds union sctp_params addrs; 2271da177e4SLinus Torvalds size_t chunksize; 2281da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2291da177e4SLinus Torvalds int num_types, addrs_len = 0; 2301da177e4SLinus Torvalds struct sctp_sock *sp; 2311da177e4SLinus Torvalds sctp_supported_addrs_param_t sat; 2323dbe8656SAl Viro __be16 types[2]; 2330f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 234131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 235131a47e3SVlad Yasevich int num_ext = 0; 236131a47e3SVlad Yasevich __u8 extensions[3]; 237730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 238730fc3d0SVlad Yasevich *auth_hmacs = NULL; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2411da177e4SLinus Torvalds * 2421da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2431da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2441da177e4SLinus Torvalds */ 2451da177e4SLinus Torvalds retval = NULL; 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2481da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2511da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2521da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2531da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2541da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds /* How many address types are needed? */ 2571da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2581da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2591da177e4SLinus Torvalds 260a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 261a8170c35SWei Yongjun chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types)); 2621da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2638ee4be37SVlad Yasevich 26428aa4c26SXin Long if (asoc->prsctp_enable) 265036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 266036b579bSVlad Yasevich 267131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 268131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 269131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 270131a47e3SVlad Yasevich * INIT-ACK parameters. 271131a47e3SVlad Yasevich */ 272e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) { 273131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 274131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 275131a47e3SVlad Yasevich num_ext += 2; 276131a47e3SVlad Yasevich } 277131a47e3SVlad Yasevich 2786fc791eeSmalc if (sp->adaptation_ind) 2791da177e4SLinus Torvalds chunksize += sizeof(aiparam); 2806fc791eeSmalc 2811da177e4SLinus Torvalds chunksize += vparam_len; 2821da177e4SLinus Torvalds 283730fc3d0SVlad Yasevich /* Account for AUTH related parameters */ 284b14878ccSVlad Yasevich if (ep->auth_enable) { 285730fc3d0SVlad Yasevich /* Add random parameter length*/ 286730fc3d0SVlad Yasevich chunksize += sizeof(asoc->c.auth_random); 287730fc3d0SVlad Yasevich 288730fc3d0SVlad Yasevich /* Add HMACS parameter length if any were defined */ 289730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 290730fc3d0SVlad Yasevich if (auth_hmacs->length) 291a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 292730fc3d0SVlad Yasevich else 293730fc3d0SVlad Yasevich auth_hmacs = NULL; 294730fc3d0SVlad Yasevich 295730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 296730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 297730fc3d0SVlad Yasevich if (auth_chunks->length) 298a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 299730fc3d0SVlad Yasevich else 3009baffaa6SVlad Yasevich auth_chunks = NULL; 301730fc3d0SVlad Yasevich 302730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 303730fc3d0SVlad Yasevich num_ext += 1; 304730fc3d0SVlad Yasevich } 305730fc3d0SVlad Yasevich 306131a47e3SVlad Yasevich /* If we have any extensions to report, account for that */ 307131a47e3SVlad Yasevich if (num_ext) 308a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 309a8170c35SWei Yongjun num_ext); 310131a47e3SVlad Yasevich 3111da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3121da177e4SLinus Torvalds * 3131da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 3141da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 3151da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 3161da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 3171da177e4SLinus Torvalds * other address types if the Host Name address parameter is 3181da177e4SLinus Torvalds * present in the received INIT chunk. 3191da177e4SLinus Torvalds * 3201da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 3211da177e4SLinus Torvalds */ 3221da177e4SLinus Torvalds 323cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); 3241da177e4SLinus Torvalds if (!retval) 3251da177e4SLinus Torvalds goto nodata; 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds retval->subh.init_hdr = 3281da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3291da177e4SLinus Torvalds retval->param_hdr.v = 3301da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3331da177e4SLinus Torvalds * 3341da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3351da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3361da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3371da177e4SLinus Torvalds * support any address type. 3381da177e4SLinus Torvalds */ 3391da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3401da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3411da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3421da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 345131a47e3SVlad Yasevich 3467aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 347131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 348131a47e3SVlad Yasevich */ 349131a47e3SVlad Yasevich if (num_ext) { 350131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 351131a47e3SVlad Yasevich ext_param.param_hdr.length = 352131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 353131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 354131a47e3SVlad Yasevich &ext_param); 3558ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 356131a47e3SVlad Yasevich } 357131a47e3SVlad Yasevich 35828aa4c26SXin Long if (asoc->prsctp_enable) 3591da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 360131a47e3SVlad Yasevich 3616fc791eeSmalc if (sp->adaptation_ind) { 3620f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3631da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3640f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3651da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3666fc791eeSmalc } 367131a47e3SVlad Yasevich 368730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 369b14878ccSVlad Yasevich if (ep->auth_enable) { 370730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 371730fc3d0SVlad Yasevich asoc->c.auth_random); 372730fc3d0SVlad Yasevich if (auth_hmacs) 373730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 374730fc3d0SVlad Yasevich auth_hmacs); 375730fc3d0SVlad Yasevich if (auth_chunks) 376730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 377730fc3d0SVlad Yasevich auth_chunks); 378730fc3d0SVlad Yasevich } 3791da177e4SLinus Torvalds nodata: 3801da177e4SLinus Torvalds kfree(addrs.v); 3811da177e4SLinus Torvalds return retval; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3851da177e4SLinus Torvalds const struct sctp_chunk *chunk, 386dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3871da177e4SLinus Torvalds { 3881da177e4SLinus Torvalds sctp_inithdr_t initack; 3891da177e4SLinus Torvalds struct sctp_chunk *retval; 3901da177e4SLinus Torvalds union sctp_params addrs; 3916fc791eeSmalc struct sctp_sock *sp; 3921da177e4SLinus Torvalds int addrs_len; 3931da177e4SLinus Torvalds sctp_cookie_param_t *cookie; 3941da177e4SLinus Torvalds int cookie_len; 3951da177e4SLinus Torvalds size_t chunksize; 3960f3fffd8SIvan Skytte Jorgensen sctp_adaptation_ind_param_t aiparam; 397131a47e3SVlad Yasevich sctp_supported_ext_param_t ext_param; 398131a47e3SVlad Yasevich int num_ext = 0; 399131a47e3SVlad Yasevich __u8 extensions[3]; 400730fc3d0SVlad Yasevich sctp_paramhdr_t *auth_chunks = NULL, 401730fc3d0SVlad Yasevich *auth_hmacs = NULL, 402730fc3d0SVlad Yasevich *auth_random = NULL; 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds retval = NULL; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 4071da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 4101da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 4111da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 4121da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 4131da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 4161da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 4171da177e4SLinus Torvalds */ 4181da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 4191da177e4SLinus Torvalds addrs.v, addrs_len); 4201da177e4SLinus Torvalds if (!cookie) 4211da177e4SLinus Torvalds goto nomem_cookie; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4241da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4251da177e4SLinus Torvalds */ 4266fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4271da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4301da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4311da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4321da177e4SLinus Torvalds 4335ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 434036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 435036b579bSVlad Yasevich 4365ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 437131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 438131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 439131a47e3SVlad Yasevich num_ext += 2; 440131a47e3SVlad Yasevich } 441131a47e3SVlad Yasevich 4426fc791eeSmalc if (sp->adaptation_ind) 4431da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4441da177e4SLinus Torvalds 445730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 446730fc3d0SVlad Yasevich auth_random = (sctp_paramhdr_t *)asoc->c.auth_random; 447730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 448730fc3d0SVlad Yasevich 449730fc3d0SVlad Yasevich auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs; 450730fc3d0SVlad Yasevich if (auth_hmacs->length) 451a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_hmacs->length)); 452730fc3d0SVlad Yasevich else 453730fc3d0SVlad Yasevich auth_hmacs = NULL; 454730fc3d0SVlad Yasevich 455730fc3d0SVlad Yasevich auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks; 456730fc3d0SVlad Yasevich if (auth_chunks->length) 457a8170c35SWei Yongjun chunksize += WORD_ROUND(ntohs(auth_chunks->length)); 458730fc3d0SVlad Yasevich else 459730fc3d0SVlad Yasevich auth_chunks = NULL; 460730fc3d0SVlad Yasevich 461730fc3d0SVlad Yasevich extensions[num_ext] = SCTP_CID_AUTH; 462730fc3d0SVlad Yasevich num_ext += 1; 463730fc3d0SVlad Yasevich } 464730fc3d0SVlad Yasevich 4658ee4be37SVlad Yasevich if (num_ext) 466a8170c35SWei Yongjun chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) + 467a8170c35SWei Yongjun num_ext); 4688ee4be37SVlad Yasevich 4691da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 470cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); 4711da177e4SLinus Torvalds if (!retval) 4721da177e4SLinus Torvalds goto nomem_chunk; 4731da177e4SLinus Torvalds 474b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 475b99a4d53SDan Carpenter * 476b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 477b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 478b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 479b99a4d53SDan Carpenter * to which it is replying. 480b99a4d53SDan Carpenter * 481b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4821da177e4SLinus Torvalds */ 4831da177e4SLinus Torvalds retval->transport = chunk->transport; 484b99a4d53SDan Carpenter 4851da177e4SLinus Torvalds retval->subh.init_hdr = 4861da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4871da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4881da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4891da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4901da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 491131a47e3SVlad Yasevich if (num_ext) { 492131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 493131a47e3SVlad Yasevich ext_param.param_hdr.length = 494131a47e3SVlad Yasevich htons(sizeof(sctp_supported_ext_param_t) + num_ext); 495131a47e3SVlad Yasevich sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t), 496131a47e3SVlad Yasevich &ext_param); 4978ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 498131a47e3SVlad Yasevich } 4991da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 5001da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 5011da177e4SLinus Torvalds 5026fc791eeSmalc if (sp->adaptation_ind) { 5030f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 5041da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 5056fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 5061da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 5076fc791eeSmalc } 5081da177e4SLinus Torvalds 509730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 510730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 511730fc3d0SVlad Yasevich auth_random); 512730fc3d0SVlad Yasevich if (auth_hmacs) 513730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 514730fc3d0SVlad Yasevich auth_hmacs); 515730fc3d0SVlad Yasevich if (auth_chunks) 516730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 517730fc3d0SVlad Yasevich auth_chunks); 518730fc3d0SVlad Yasevich } 519730fc3d0SVlad Yasevich 5201da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 5211da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds nomem_chunk: 5241da177e4SLinus Torvalds kfree(cookie); 5251da177e4SLinus Torvalds nomem_cookie: 5261da177e4SLinus Torvalds kfree(addrs.v); 5271da177e4SLinus Torvalds return retval; 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5311da177e4SLinus Torvalds * 5321da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5331da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5341da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5351da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5361da177e4SLinus Torvalds * chunks in the same packet. 5371da177e4SLinus Torvalds * 5381da177e4SLinus Torvalds * 0 1 2 3 5391da177e4SLinus 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 5401da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5411da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5431da177e4SLinus Torvalds * / Cookie / 5441da177e4SLinus Torvalds * \ \ 5451da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5461da177e4SLinus Torvalds * 5471da177e4SLinus Torvalds * Chunk Flags: 8 bit 5481da177e4SLinus Torvalds * 5491da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5501da177e4SLinus Torvalds * 5511da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5521da177e4SLinus Torvalds * 5531da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5541da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5551da177e4SLinus Torvalds * 5561da177e4SLinus Torvalds * Cookie: variable size 5571da177e4SLinus Torvalds * 5581da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5591da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5601da177e4SLinus Torvalds * 5611da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5621da177e4SLinus Torvalds * to insure interoperability. 5631da177e4SLinus Torvalds */ 5641da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5651da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5661da177e4SLinus Torvalds { 5671da177e4SLinus Torvalds struct sctp_chunk *retval; 5681da177e4SLinus Torvalds void *cookie; 5691da177e4SLinus Torvalds int cookie_len; 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5721da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 575cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, 576cea8768fSMarcelo Ricardo Leitner cookie_len, GFP_ATOMIC); 5771da177e4SLinus Torvalds if (!retval) 5781da177e4SLinus Torvalds goto nodata; 5791da177e4SLinus Torvalds retval->subh.cookie_hdr = 5801da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5831da177e4SLinus Torvalds * 5841da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5851da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5861da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5871da177e4SLinus Torvalds * to which it is replying. 5881da177e4SLinus Torvalds * 5891da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5901da177e4SLinus Torvalds */ 5911da177e4SLinus Torvalds if (chunk) 5921da177e4SLinus Torvalds retval->transport = chunk->transport; 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds nodata: 5951da177e4SLinus Torvalds return retval; 5961da177e4SLinus Torvalds } 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5991da177e4SLinus Torvalds * 6001da177e4SLinus Torvalds * This chunk is used only during the initialization of an 6011da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 6021da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 6031da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 6041da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 6051da177e4SLinus Torvalds * 6061da177e4SLinus Torvalds * 0 1 2 3 6071da177e4SLinus 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 6081da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6091da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 6101da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6111da177e4SLinus Torvalds * 6121da177e4SLinus Torvalds * Chunk Flags: 8 bits 6131da177e4SLinus Torvalds * 6141da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 6151da177e4SLinus Torvalds */ 6161da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 6171da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6181da177e4SLinus Torvalds { 6191da177e4SLinus Torvalds struct sctp_chunk *retval; 6201da177e4SLinus Torvalds 621cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6241da177e4SLinus Torvalds * 6251da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6261da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6271da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6281da177e4SLinus Torvalds * to which it is replying. 6291da177e4SLinus Torvalds * 6301da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6311da177e4SLinus Torvalds */ 6321da177e4SLinus Torvalds if (retval && chunk) 6331da177e4SLinus Torvalds retval->transport = chunk->transport; 6341da177e4SLinus Torvalds 6351da177e4SLinus Torvalds return retval; 6361da177e4SLinus Torvalds } 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds /* 6391da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6401da177e4SLinus Torvalds * CWR: 6411da177e4SLinus Torvalds * 6421da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6431da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6441da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6451da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6461da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6471da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6481da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6491da177e4SLinus Torvalds * CE bit. 6501da177e4SLinus Torvalds * 6511da177e4SLinus Torvalds * 0 1 2 3 6521da177e4SLinus 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 6531da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6541da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6551da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6561da177e4SLinus Torvalds * | Lowest TSN Number | 6571da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6581da177e4SLinus Torvalds * 6591da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6601da177e4SLinus Torvalds */ 6611da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6621da177e4SLinus Torvalds const __u32 lowest_tsn, 6631da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6641da177e4SLinus Torvalds { 6651da177e4SLinus Torvalds struct sctp_chunk *retval; 6661da177e4SLinus Torvalds sctp_cwrhdr_t cwr; 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 669072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, 670cea8768fSMarcelo Ricardo Leitner sizeof(sctp_cwrhdr_t), GFP_ATOMIC); 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds if (!retval) 6731da177e4SLinus Torvalds goto nodata; 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6761da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6791da177e4SLinus Torvalds * 6801da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6811da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6821da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6831da177e4SLinus Torvalds * to which it is replying. 6841da177e4SLinus Torvalds * 6851da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6861da177e4SLinus Torvalds * came from.] 6871da177e4SLinus Torvalds */ 6881da177e4SLinus Torvalds if (chunk) 6891da177e4SLinus Torvalds retval->transport = chunk->transport; 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds nodata: 6921da177e4SLinus Torvalds return retval; 6931da177e4SLinus Torvalds } 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6961da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6971da177e4SLinus Torvalds const __u32 lowest_tsn) 6981da177e4SLinus Torvalds { 6991da177e4SLinus Torvalds struct sctp_chunk *retval; 7001da177e4SLinus Torvalds sctp_ecnehdr_t ecne; 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 703072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, 704cea8768fSMarcelo Ricardo Leitner sizeof(sctp_ecnehdr_t), GFP_ATOMIC); 7051da177e4SLinus Torvalds if (!retval) 7061da177e4SLinus Torvalds goto nodata; 7071da177e4SLinus Torvalds retval->subh.ecne_hdr = 7081da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds nodata: 7111da177e4SLinus Torvalds return retval; 7121da177e4SLinus Torvalds } 7131da177e4SLinus Torvalds 714a6c2f792SXin Long static void sctp_set_prsctp_policy(struct sctp_chunk *chunk, 715a6c2f792SXin Long const struct sctp_sndrcvinfo *sinfo) 716a6c2f792SXin Long { 717a6c2f792SXin Long if (!chunk->asoc->prsctp_enable) 718a6c2f792SXin Long return; 719a6c2f792SXin Long 720a6c2f792SXin Long if (SCTP_PR_TTL_ENABLED(sinfo->sinfo_flags)) 721a6c2f792SXin Long chunk->prsctp_param = 722a6c2f792SXin Long jiffies + msecs_to_jiffies(sinfo->sinfo_timetolive); 7238dbdf1f5SXin Long else if (SCTP_PR_RTX_ENABLED(sinfo->sinfo_flags) || 7248dbdf1f5SXin Long SCTP_PR_PRIO_ENABLED(sinfo->sinfo_flags)) 72501aadb3aSXin Long chunk->prsctp_param = sinfo->sinfo_timetolive; 726a6c2f792SXin Long } 727a6c2f792SXin Long 7281da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 7291da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 7301da177e4SLinus Torvalds */ 7311da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 7321da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 733cea8768fSMarcelo Ricardo Leitner int data_len, __u8 flags, __u16 ssn, 734cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 7351da177e4SLinus Torvalds { 7361da177e4SLinus Torvalds struct sctp_chunk *retval; 7371da177e4SLinus Torvalds struct sctp_datahdr dp; 7381da177e4SLinus Torvalds int chunk_len; 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7411da177e4SLinus Torvalds * creating the chunk. 7421da177e4SLinus Torvalds */ 7431da177e4SLinus Torvalds dp.tsn = 0; 7441da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 7451da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 748eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 7491da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7501da177e4SLinus Torvalds dp.ssn = 0; 7511da177e4SLinus Torvalds } else 7521da177e4SLinus Torvalds dp.ssn = htons(ssn); 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 755cea8768fSMarcelo Ricardo Leitner retval = sctp_make_data(asoc, flags, chunk_len, gfp); 7561da177e4SLinus Torvalds if (!retval) 7571da177e4SLinus Torvalds goto nodata; 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7601da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 761a6c2f792SXin Long sctp_set_prsctp_policy(retval, sinfo); 7621da177e4SLinus Torvalds 7631da177e4SLinus Torvalds nodata: 7641da177e4SLinus Torvalds return retval; 7651da177e4SLinus Torvalds } 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7681da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7691da177e4SLinus Torvalds * including duplicates and gaps. 7701da177e4SLinus Torvalds */ 7711da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7721da177e4SLinus Torvalds { 7731da177e4SLinus Torvalds struct sctp_chunk *retval; 7741da177e4SLinus Torvalds struct sctp_sackhdr sack; 7751da177e4SLinus Torvalds int len; 7761da177e4SLinus Torvalds __u32 ctsn; 7771da177e4SLinus Torvalds __u16 num_gabs, num_dup_tsns; 7784244854dSNeil Horman struct sctp_association *aptr = (struct sctp_association *)asoc; 7791da177e4SLinus Torvalds struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 78002015180SVlad Yasevich struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 7814244854dSNeil Horman struct sctp_transport *trans; 7821da177e4SLinus Torvalds 78302015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7841da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 785bb33381dSDaniel Borkmann 786bb33381dSDaniel Borkmann pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 78902015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7901da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds /* Initialize the SACK header. */ 7931da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7941da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7951da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7961da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds len = sizeof(sack) 7991da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 8001da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds /* Create the chunk. */ 803cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); 8041da177e4SLinus Torvalds if (!retval) 8051da177e4SLinus Torvalds goto nodata; 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8081da177e4SLinus Torvalds * 8091da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8101da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 8111da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 8121da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 8131da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 8141da177e4SLinus Torvalds * reply chunk. 8151da177e4SLinus Torvalds * 8161da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 8171da177e4SLinus Torvalds * in packets from different source addresses in a single 8181da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 8191da177e4SLinus Torvalds * destination transport addresses from which the DATA or 8201da177e4SLinus Torvalds * control chunks being acknowledged were received. 8211da177e4SLinus Torvalds * 8221da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 8231da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 8241da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 8251da177e4SLinus Torvalds * duplicates. --piggy] 8261da177e4SLinus Torvalds * 8271da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 8281da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 8291da177e4SLinus Torvalds * destination address and not use the source address of the 8301da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 8311da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 8321da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 8331da177e4SLinus Torvalds * for the SACK is broken. 8341da177e4SLinus Torvalds * 8351da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 8361da177e4SLinus Torvalds */ 8371da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 8381da177e4SLinus Torvalds 8391da177e4SLinus Torvalds retval->subh.sack_hdr = 8401da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8411da177e4SLinus Torvalds 8421da177e4SLinus Torvalds /* Add the gap ack block information. */ 8431da177e4SLinus Torvalds if (num_gabs) 8441da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 84502015180SVlad Yasevich gabs); 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 848196d6759SMichele Baldessari if (num_dup_tsns) { 849196d6759SMichele Baldessari aptr->stats.idupchunks += num_dup_tsns; 8501da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8511da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 852196d6759SMichele Baldessari } 8534244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8544244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8554244854dSNeil Horman * the association generation to 1 8564244854dSNeil Horman * 8574244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8584244854dSNeil Horman * association so no transport will match after a wrap event like this, 8594244854dSNeil Horman * Until the next sack 8604244854dSNeil Horman */ 8614244854dSNeil Horman if (++aptr->peer.sack_generation == 0) { 8624244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8634244854dSNeil Horman transports) 8644244854dSNeil Horman trans->sack_generation = 0; 8654244854dSNeil Horman aptr->peer.sack_generation = 1; 8664244854dSNeil Horman } 8671da177e4SLinus Torvalds nodata: 8681da177e4SLinus Torvalds return retval; 8691da177e4SLinus Torvalds } 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8721da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8731da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8741da177e4SLinus Torvalds { 8751da177e4SLinus Torvalds struct sctp_chunk *retval; 8761da177e4SLinus Torvalds sctp_shutdownhdr_t shut; 8771da177e4SLinus Torvalds __u32 ctsn; 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8801da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8811da177e4SLinus Torvalds 882072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, 883cea8768fSMarcelo Ricardo Leitner sizeof(sctp_shutdownhdr_t), GFP_ATOMIC); 8841da177e4SLinus Torvalds if (!retval) 8851da177e4SLinus Torvalds goto nodata; 8861da177e4SLinus Torvalds 8871da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8881da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds if (chunk) 8911da177e4SLinus Torvalds retval->transport = chunk->transport; 8921da177e4SLinus Torvalds nodata: 8931da177e4SLinus Torvalds return retval; 8941da177e4SLinus Torvalds } 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8971da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8981da177e4SLinus Torvalds { 8991da177e4SLinus Torvalds struct sctp_chunk *retval; 9001da177e4SLinus Torvalds 901cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, 902cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 9031da177e4SLinus Torvalds 9041da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9051da177e4SLinus Torvalds * 9061da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9071da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9081da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9091da177e4SLinus Torvalds * to which it is replying. 9101da177e4SLinus Torvalds * 9111da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 9121da177e4SLinus Torvalds */ 9131da177e4SLinus Torvalds if (retval && chunk) 9141da177e4SLinus Torvalds retval->transport = chunk->transport; 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds return retval; 9171da177e4SLinus Torvalds } 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 9201da177e4SLinus Torvalds const struct sctp_association *asoc, 9211da177e4SLinus Torvalds const struct sctp_chunk *chunk) 9221da177e4SLinus Torvalds { 9231da177e4SLinus Torvalds struct sctp_chunk *retval; 9241da177e4SLinus Torvalds __u8 flags = 0; 9251da177e4SLinus Torvalds 926047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 927047a2428SJerome Forissier * reflected) 928047a2428SJerome Forissier */ 9291da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 9301da177e4SLinus Torvalds 931cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 932cea8768fSMarcelo Ricardo Leitner 0, GFP_ATOMIC); 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9351da177e4SLinus Torvalds * 9361da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9371da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9381da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9391da177e4SLinus Torvalds * to which it is replying. 9401da177e4SLinus Torvalds * 9411da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 9421da177e4SLinus Torvalds * came from.] 9431da177e4SLinus Torvalds */ 9441da177e4SLinus Torvalds if (retval && chunk) 9451da177e4SLinus Torvalds retval->transport = chunk->transport; 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds return retval; 9481da177e4SLinus Torvalds } 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 951047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9521da177e4SLinus Torvalds */ 9531da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9541da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9551da177e4SLinus Torvalds const size_t hint) 9561da177e4SLinus Torvalds { 9571da177e4SLinus Torvalds struct sctp_chunk *retval; 9581da177e4SLinus Torvalds __u8 flags = 0; 9591da177e4SLinus Torvalds 960047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 961047a2428SJerome Forissier * an INIT (vtag will be reflected). 962047a2428SJerome Forissier */ 963047a2428SJerome Forissier if (!asoc) { 964047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 965047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 966047a2428SJerome Forissier flags = 0; 967047a2428SJerome Forissier else 968047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 969047a2428SJerome Forissier } 9701da177e4SLinus Torvalds 971cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, 972cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9751da177e4SLinus Torvalds * 9761da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9771da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9781da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9791da177e4SLinus Torvalds * to which it is replying. 9801da177e4SLinus Torvalds * 9811da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9821da177e4SLinus Torvalds */ 9831da177e4SLinus Torvalds if (retval && chunk) 9841da177e4SLinus Torvalds retval->transport = chunk->transport; 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds return retval; 9871da177e4SLinus Torvalds } 9881da177e4SLinus Torvalds 9891da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9901da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9911da177e4SLinus Torvalds const struct sctp_association *asoc, 9921da177e4SLinus Torvalds const struct sctp_chunk *chunk, __u32 tsn) 9931da177e4SLinus Torvalds { 9941da177e4SLinus Torvalds struct sctp_chunk *retval; 9959f81bcd9SAl Viro __be32 payload; 9961da177e4SLinus Torvalds 9971da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) 9981da177e4SLinus Torvalds + sizeof(tsn)); 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds if (!retval) 10011da177e4SLinus Torvalds goto no_mem; 10021da177e4SLinus Torvalds 10031da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 10041da177e4SLinus Torvalds payload = htonl(tsn); 100500f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 100600f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 10091da177e4SLinus Torvalds * 10101da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 10111da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 10121da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 10131da177e4SLinus Torvalds * to which it is replying. 10141da177e4SLinus Torvalds * 10151da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 10161da177e4SLinus Torvalds */ 10171da177e4SLinus Torvalds if (chunk) 10181da177e4SLinus Torvalds retval->transport = chunk->transport; 10191da177e4SLinus Torvalds 10201da177e4SLinus Torvalds no_mem: 10211da177e4SLinus Torvalds return retval; 10221da177e4SLinus Torvalds } 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 10251da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 10266ce8e9ceSAl Viro struct msghdr *msg, 1027c164a9baSSridhar Samudrala size_t paylen) 10281da177e4SLinus Torvalds { 10291da177e4SLinus Torvalds struct sctp_chunk *retval; 1030c164a9baSSridhar Samudrala void *payload = NULL; 1031c164a9baSSridhar Samudrala int err; 10321da177e4SLinus Torvalds 1033c164a9baSSridhar Samudrala retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen); 10341da177e4SLinus Torvalds if (!retval) 10351da177e4SLinus Torvalds goto err_chunk; 10361da177e4SLinus Torvalds 10371da177e4SLinus Torvalds if (paylen) { 10381da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 1039c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 10401da177e4SLinus Torvalds if (!payload) 10411da177e4SLinus Torvalds goto err_payload; 10421da177e4SLinus Torvalds 10436ce8e9ceSAl Viro err = memcpy_from_msg(payload, msg, paylen); 1044c164a9baSSridhar Samudrala if (err < 0) 10451da177e4SLinus Torvalds goto err_copy; 10461da177e4SLinus Torvalds } 10471da177e4SLinus Torvalds 104800f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 104900f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10501da177e4SLinus Torvalds 10511da177e4SLinus Torvalds if (paylen) 10521da177e4SLinus Torvalds kfree(payload); 10531da177e4SLinus Torvalds 10541da177e4SLinus Torvalds return retval; 10551da177e4SLinus Torvalds 10561da177e4SLinus Torvalds err_copy: 10571da177e4SLinus Torvalds kfree(payload); 10581da177e4SLinus Torvalds err_payload: 10591da177e4SLinus Torvalds sctp_chunk_free(retval); 10601da177e4SLinus Torvalds retval = NULL; 10611da177e4SLinus Torvalds err_chunk: 10621da177e4SLinus Torvalds return retval; 10631da177e4SLinus Torvalds } 10641da177e4SLinus Torvalds 10655c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10665c94bf86SAdrian Bunk * enough. 10675c94bf86SAdrian Bunk */ 10685c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10695c94bf86SAdrian Bunk const void *data) 10705c94bf86SAdrian Bunk { 10715c94bf86SAdrian Bunk void *target; 10725c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 10735c94bf86SAdrian Bunk 10745c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10755c94bf86SAdrian Bunk 10766383cfb3SVlad Yasevich if (data) 10775c94bf86SAdrian Bunk memcpy(target, data, len); 10786383cfb3SVlad Yasevich else 10796383cfb3SVlad Yasevich memset(target, 0, len); 10805c94bf86SAdrian Bunk 10815c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10825c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10835c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10845c94bf86SAdrian Bunk 10855c94bf86SAdrian Bunk return target; 10865c94bf86SAdrian Bunk } 10875c94bf86SAdrian Bunk 10881da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10891da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10901da177e4SLinus Torvalds const struct sctp_association *asoc, 10911da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10921da177e4SLinus Torvalds const __u8 *payload, 10931da177e4SLinus Torvalds const size_t paylen) 10941da177e4SLinus Torvalds { 10951da177e4SLinus Torvalds struct sctp_chunk *retval; 10961da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10971da177e4SLinus Torvalds 10981da177e4SLinus Torvalds retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen 109900f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 11001da177e4SLinus Torvalds if (!retval) 11011da177e4SLinus Torvalds goto end; 11021da177e4SLinus Torvalds 110300f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen 110400f1c2dfSWei Yongjun + sizeof(sctp_paramhdr_t)); 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 11071da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 110800f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 110900f1c2dfSWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr); 11101da177e4SLinus Torvalds 11111da177e4SLinus Torvalds end: 11121da177e4SLinus Torvalds return retval; 11131da177e4SLinus Torvalds } 11141da177e4SLinus Torvalds 1115ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1116ba016670SWei Yongjun const struct sctp_association *asoc, 1117ba016670SWei Yongjun const struct sctp_chunk *chunk, 1118ba016670SWei Yongjun struct sctp_paramhdr *param) 1119ba016670SWei Yongjun { 1120ba016670SWei Yongjun struct sctp_chunk *retval; 1121ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1122ba016670SWei Yongjun size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) + 1123ba016670SWei Yongjun sizeof(sctp_paramhdr_t); 1124ba016670SWei Yongjun 1125ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1126ba016670SWei Yongjun if (!retval) 1127ba016670SWei Yongjun goto nodata; 1128ba016670SWei Yongjun 1129ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 1130ba016670SWei Yongjun sizeof(error) + sizeof(sctp_paramhdr_t)); 1131ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 1132ba016670SWei Yongjun sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param); 1133ba016670SWei Yongjun 1134ba016670SWei Yongjun nodata: 1135ba016670SWei Yongjun return retval; 1136ba016670SWei Yongjun } 1137ba016670SWei Yongjun 1138de4594a5SNeil Horman struct sctp_chunk *sctp_make_violation_max_retrans( 1139de4594a5SNeil Horman const struct sctp_association *asoc, 1140de4594a5SNeil Horman const struct sctp_chunk *chunk) 1141de4594a5SNeil Horman { 1142de4594a5SNeil Horman struct sctp_chunk *retval; 1143de4594a5SNeil Horman static const char error[] = "Association exceeded its max_retans count"; 1144de4594a5SNeil Horman size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t); 1145de4594a5SNeil Horman 1146de4594a5SNeil Horman retval = sctp_make_abort(asoc, chunk, payload_len); 1147de4594a5SNeil Horman if (!retval) 1148de4594a5SNeil Horman goto nodata; 1149de4594a5SNeil Horman 1150de4594a5SNeil Horman sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); 1151de4594a5SNeil Horman sctp_addto_chunk(retval, sizeof(error), error); 1152de4594a5SNeil Horman 1153de4594a5SNeil Horman nodata: 1154de4594a5SNeil Horman return retval; 1155de4594a5SNeil Horman } 1156de4594a5SNeil Horman 11571da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11581da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 115992c73af5SWei Yongjun const struct sctp_transport *transport) 11601da177e4SLinus Torvalds { 116192c73af5SWei Yongjun struct sctp_chunk *retval; 116292c73af5SWei Yongjun sctp_sender_hb_info_t hbinfo; 116392c73af5SWei Yongjun 1164cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, 1165cea8768fSMarcelo Ricardo Leitner sizeof(hbinfo), GFP_ATOMIC); 11661da177e4SLinus Torvalds 11671da177e4SLinus Torvalds if (!retval) 11681da177e4SLinus Torvalds goto nodata; 11691da177e4SLinus Torvalds 117092c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 117192c73af5SWei Yongjun hbinfo.param_hdr.length = htons(sizeof(sctp_sender_hb_info_t)); 117292c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 117392c73af5SWei Yongjun hbinfo.sent_at = jiffies; 117492c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 117592c73af5SWei Yongjun 11761da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11771da177e4SLinus Torvalds * what transport it belongs to. 11781da177e4SLinus Torvalds */ 11791da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 118092c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 118192c73af5SWei Yongjun &hbinfo); 11821da177e4SLinus Torvalds 11831da177e4SLinus Torvalds nodata: 11841da177e4SLinus Torvalds return retval; 11851da177e4SLinus Torvalds } 11861da177e4SLinus Torvalds 11871da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11881da177e4SLinus Torvalds const struct sctp_chunk *chunk, 11891da177e4SLinus Torvalds const void *payload, const size_t paylen) 11901da177e4SLinus Torvalds { 11911da177e4SLinus Torvalds struct sctp_chunk *retval; 11921da177e4SLinus Torvalds 1193cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, 1194cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 11951da177e4SLinus Torvalds if (!retval) 11961da177e4SLinus Torvalds goto nodata; 11971da177e4SLinus Torvalds 11981da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11991da177e4SLinus Torvalds 12001da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12011da177e4SLinus Torvalds * 12021da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12031da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 12041da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 12051da177e4SLinus Torvalds * to which it is replying. 12061da177e4SLinus Torvalds * 12071da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 12081da177e4SLinus Torvalds */ 12091da177e4SLinus Torvalds if (chunk) 12101da177e4SLinus Torvalds retval->transport = chunk->transport; 12111da177e4SLinus Torvalds 12121da177e4SLinus Torvalds nodata: 12131da177e4SLinus Torvalds return retval; 12141da177e4SLinus Torvalds } 12151da177e4SLinus Torvalds 12161da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 12171da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 12181da177e4SLinus Torvalds */ 12191da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 12201da177e4SLinus Torvalds const struct sctp_association *asoc, 12211da177e4SLinus Torvalds const struct sctp_chunk *chunk, 12221da177e4SLinus Torvalds size_t size) 12231da177e4SLinus Torvalds { 12241da177e4SLinus Torvalds struct sctp_chunk *retval; 12251da177e4SLinus Torvalds 1226072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 1227cea8768fSMarcelo Ricardo Leitner sizeof(sctp_errhdr_t) + size, GFP_ATOMIC); 12281da177e4SLinus Torvalds if (!retval) 12291da177e4SLinus Torvalds goto nodata; 12301da177e4SLinus Torvalds 12311da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12321da177e4SLinus Torvalds * 12331da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12341da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12351da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12361da177e4SLinus Torvalds * to which it is replying. 12371da177e4SLinus Torvalds * 12381da177e4SLinus Torvalds */ 12391da177e4SLinus Torvalds if (chunk) 12401da177e4SLinus Torvalds retval->transport = chunk->transport; 12411da177e4SLinus Torvalds 12421da177e4SLinus Torvalds nodata: 12431da177e4SLinus Torvalds return retval; 12441da177e4SLinus Torvalds } 12451da177e4SLinus Torvalds 12465fa782c2SNeil Horman /* Create an Operation Error chunk of a fixed size, 12475fa782c2SNeil Horman * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) 12485fa782c2SNeil Horman * This is a helper function to allocate an error chunk for 12495fa782c2SNeil Horman * for those invalid parameter codes in which we may not want 1250d82603c6SJorrit Schippers * to report all the errors, if the incoming chunk is large 12515fa782c2SNeil Horman */ 12525fa782c2SNeil Horman static inline struct sctp_chunk *sctp_make_op_error_fixed( 12535fa782c2SNeil Horman const struct sctp_association *asoc, 12545fa782c2SNeil Horman const struct sctp_chunk *chunk) 12555fa782c2SNeil Horman { 12565fa782c2SNeil Horman size_t size = asoc ? asoc->pathmtu : 0; 12575fa782c2SNeil Horman 12585fa782c2SNeil Horman if (!size) 12595fa782c2SNeil Horman size = SCTP_DEFAULT_MAXSEGMENT; 12605fa782c2SNeil Horman 12615fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 12625fa782c2SNeil Horman } 12635fa782c2SNeil Horman 12641da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 12651da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12661da177e4SLinus Torvalds const struct sctp_chunk *chunk, 126763706c5cSAl Viro __be16 cause_code, const void *payload, 12686383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12691da177e4SLinus Torvalds { 12701da177e4SLinus Torvalds struct sctp_chunk *retval; 12711da177e4SLinus Torvalds 12726383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12731da177e4SLinus Torvalds if (!retval) 12741da177e4SLinus Torvalds goto nodata; 12751da177e4SLinus Torvalds 12766383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 127700f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12786383cfb3SVlad Yasevich if (reserve_tail) 12796383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12801da177e4SLinus Torvalds 12811da177e4SLinus Torvalds nodata: 12821da177e4SLinus Torvalds return retval; 12831da177e4SLinus Torvalds } 12841da177e4SLinus Torvalds 12854cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 12864cd57c80SVlad Yasevich { 12874cd57c80SVlad Yasevich struct sctp_chunk *retval; 12884cd57c80SVlad Yasevich struct sctp_hmac *hmac_desc; 12894cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 12904cd57c80SVlad Yasevich __u8 *hmac; 12914cd57c80SVlad Yasevich 12924cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12934cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12944cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12954cd57c80SVlad Yasevich return NULL; 12964cd57c80SVlad Yasevich 1297072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 1298cea8768fSMarcelo Ricardo Leitner hmac_desc->hmac_len + sizeof(sctp_authhdr_t), 1299cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 13004cd57c80SVlad Yasevich if (!retval) 13014cd57c80SVlad Yasevich return NULL; 13024cd57c80SVlad Yasevich 13034cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 13044cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 13054cd57c80SVlad Yasevich 13064cd57c80SVlad Yasevich retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t), 13074cd57c80SVlad Yasevich &auth_hdr); 13084cd57c80SVlad Yasevich 13094cd57c80SVlad Yasevich hmac = skb_put(retval->skb, hmac_desc->hmac_len); 13104cd57c80SVlad Yasevich memset(hmac, 0, hmac_desc->hmac_len); 13114cd57c80SVlad Yasevich 13124cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 13134cd57c80SVlad Yasevich retval->chunk_hdr->length = 13144cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 13154cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 13164cd57c80SVlad Yasevich 13174cd57c80SVlad Yasevich return retval; 13184cd57c80SVlad Yasevich } 13194cd57c80SVlad Yasevich 13204cd57c80SVlad Yasevich 13211da177e4SLinus Torvalds /******************************************************************** 13221da177e4SLinus Torvalds * 2nd Level Abstractions 13231da177e4SLinus Torvalds ********************************************************************/ 13241da177e4SLinus Torvalds 13251da177e4SLinus Torvalds /* Turn an skb into a chunk. 13261da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13273dc0a548Swangweidong * 13283dc0a548Swangweidong * sctpimpguide-05.txt Section 2.8.2 13293dc0a548Swangweidong * M1) Each time a new DATA chunk is transmitted 13303dc0a548Swangweidong * set the 'TSN.Missing.Report' count for that TSN to 0. The 13313dc0a548Swangweidong * 'TSN.Missing.Report' count will be used to determine missing chunks 13323dc0a548Swangweidong * and when to fast retransmit. 13333dc0a548Swangweidong * 13341da177e4SLinus Torvalds */ 13351da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13361da177e4SLinus Torvalds const struct sctp_association *asoc, 1337cea8768fSMarcelo Ricardo Leitner struct sock *sk, gfp_t gfp) 13381da177e4SLinus Torvalds { 13391da177e4SLinus Torvalds struct sctp_chunk *retval; 13401da177e4SLinus Torvalds 1341cea8768fSMarcelo Ricardo Leitner retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); 13421da177e4SLinus Torvalds 13431da177e4SLinus Torvalds if (!retval) 13441da177e4SLinus Torvalds goto nodata; 1345bb33381dSDaniel Borkmann if (!sk) 1346bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13471da177e4SLinus Torvalds 134879af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13491da177e4SLinus Torvalds retval->skb = skb; 13501da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13511da177e4SLinus Torvalds retval->singleton = 1; 13521da177e4SLinus Torvalds 1353c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13541da177e4SLinus Torvalds 13551da177e4SLinus Torvalds /* Polish the bead hole. */ 13561da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13571da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13581da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 13591da177e4SLinus Torvalds atomic_set(&retval->refcnt, 1); 13601da177e4SLinus Torvalds 13611da177e4SLinus Torvalds nodata: 13621da177e4SLinus Torvalds return retval; 13631da177e4SLinus Torvalds } 13641da177e4SLinus Torvalds 13651da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13661da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13671da177e4SLinus Torvalds union sctp_addr *dest) 13681da177e4SLinus Torvalds { 1369f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 137016b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13711da177e4SLinus Torvalds } 13721da177e4SLinus Torvalds 13731da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13741da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13751da177e4SLinus Torvalds { 13761da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13771da177e4SLinus Torvalds if (chunk->transport) { 13786a1e5f33SAl Viro return &chunk->transport->ipaddr; 13791da177e4SLinus Torvalds } else { 13801da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13816a1e5f33SAl Viro return &chunk->source; 13821da177e4SLinus Torvalds } 13831da177e4SLinus Torvalds } 13841da177e4SLinus Torvalds 13851da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13861da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13871da177e4SLinus Torvalds */ 1388072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 1389cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1390cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 13911da177e4SLinus Torvalds { 13921da177e4SLinus Torvalds struct sctp_chunk *retval; 13931da177e4SLinus Torvalds sctp_chunkhdr_t *chunk_hdr; 13941da177e4SLinus Torvalds struct sk_buff *skb; 13951da177e4SLinus Torvalds struct sock *sk; 13961da177e4SLinus Torvalds 13971da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 1398cea8768fSMarcelo Ricardo Leitner skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen), gfp); 13991da177e4SLinus Torvalds if (!skb) 14001da177e4SLinus Torvalds goto nodata; 14011da177e4SLinus Torvalds 14021da177e4SLinus Torvalds /* Make room for the chunk header. */ 14031da177e4SLinus Torvalds chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t)); 14041da177e4SLinus Torvalds chunk_hdr->type = type; 14051da177e4SLinus Torvalds chunk_hdr->flags = flags; 14061da177e4SLinus Torvalds chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t)); 14071da177e4SLinus Torvalds 14081da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 1409cea8768fSMarcelo Ricardo Leitner retval = sctp_chunkify(skb, asoc, sk, gfp); 14101da177e4SLinus Torvalds if (!retval) { 14111da177e4SLinus Torvalds kfree_skb(skb); 14121da177e4SLinus Torvalds goto nodata; 14131da177e4SLinus Torvalds } 14141da177e4SLinus Torvalds 14151da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 14161da177e4SLinus Torvalds retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr); 14171da177e4SLinus Torvalds 14184cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 14194cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 14204cd57c80SVlad Yasevich retval->auth = 1; 14214cd57c80SVlad Yasevich 14221da177e4SLinus Torvalds return retval; 14231da177e4SLinus Torvalds nodata: 14241da177e4SLinus Torvalds return NULL; 14251da177e4SLinus Torvalds } 14261da177e4SLinus Torvalds 1427072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1428cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp) 1429072017b4SVlad Yasevich { 1430cea8768fSMarcelo Ricardo Leitner return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); 1431072017b4SVlad Yasevich } 1432072017b4SVlad Yasevich 1433072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1434cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1435cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 1436072017b4SVlad Yasevich { 1437cea8768fSMarcelo Ricardo Leitner struct sctp_chunk *chunk; 1438072017b4SVlad Yasevich 1439cea8768fSMarcelo Ricardo Leitner chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); 1440072017b4SVlad Yasevich if (chunk) 1441072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1442072017b4SVlad Yasevich 1443072017b4SVlad Yasevich return chunk; 1444072017b4SVlad Yasevich } 14451da177e4SLinus Torvalds 14461da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14471da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14481da177e4SLinus Torvalds { 1449a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1450a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1451a08de64dSVlad Yasevich 1452c485658bSDaniel Borkmann consume_skb(chunk->skb); 1453c485658bSDaniel Borkmann consume_skb(chunk->auth_chunk); 14541da177e4SLinus Torvalds 14551da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 14561da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 14571da177e4SLinus Torvalds } 14581da177e4SLinus Torvalds 14591da177e4SLinus Torvalds /* Possibly, free the chunk. */ 14601da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 14611da177e4SLinus Torvalds { 14621da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 14631da177e4SLinus Torvalds if (chunk->msg) 14641da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 14651da177e4SLinus Torvalds 14661da177e4SLinus Torvalds sctp_chunk_put(chunk); 14671da177e4SLinus Torvalds } 14681da177e4SLinus Torvalds 14691da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14701da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14711da177e4SLinus Torvalds { 14721da177e4SLinus Torvalds atomic_inc(&ch->refcnt); 14731da177e4SLinus Torvalds } 14741da177e4SLinus Torvalds 14751da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14761da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14771da177e4SLinus Torvalds { 14781da177e4SLinus Torvalds if (atomic_dec_and_test(&ch->refcnt)) 14791da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14801da177e4SLinus Torvalds } 14811da177e4SLinus Torvalds 14821da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14831da177e4SLinus Torvalds * enough. 14841da177e4SLinus Torvalds */ 14851da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14861da177e4SLinus Torvalds { 14871da177e4SLinus Torvalds void *target; 14881da177e4SLinus Torvalds void *padding; 14891da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 14908d614adeSWei Yongjun int padlen = WORD_ROUND(chunklen) - chunklen; 14911da177e4SLinus Torvalds 14921da177e4SLinus Torvalds padding = skb_put(chunk->skb, padlen); 14931da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 14941da177e4SLinus Torvalds 14951da177e4SLinus Torvalds memset(padding, 0, padlen); 14961da177e4SLinus Torvalds memcpy(target, data, len); 14971da177e4SLinus Torvalds 14981da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14991da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 150027a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15011da177e4SLinus Torvalds 15021da177e4SLinus Torvalds return target; 15031da177e4SLinus Torvalds } 15041da177e4SLinus Torvalds 15055fa782c2SNeil Horman /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient 15065fa782c2SNeil Horman * space in the chunk 15075fa782c2SNeil Horman */ 15086daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, 15095fa782c2SNeil Horman int len, const void *data) 15105fa782c2SNeil Horman { 15112e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) >= len) 15125fa782c2SNeil Horman return sctp_addto_chunk(chunk, len, data); 15135fa782c2SNeil Horman else 15145fa782c2SNeil Horman return NULL; 15155fa782c2SNeil Horman } 15165fa782c2SNeil Horman 15171da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 15181da177e4SLinus Torvalds * chunk is not big enough. 15191da177e4SLinus Torvalds * Returns a kernel err value. 15201da177e4SLinus Torvalds */ 1521e0eb093eSAl Viro int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 1522e0eb093eSAl Viro struct iov_iter *from) 15231da177e4SLinus Torvalds { 1524e0eb093eSAl Viro void *target; 1525e0eb093eSAl Viro ssize_t copied; 15261da177e4SLinus Torvalds 15271da177e4SLinus Torvalds /* Make room in chunk for data. */ 15281da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15291da177e4SLinus Torvalds 15301da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 1531e0eb093eSAl Viro copied = copy_from_iter(target, len, from); 1532e0eb093eSAl Viro if (copied != len) 1533e0eb093eSAl Viro return -EFAULT; 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15361da177e4SLinus Torvalds chunk->chunk_hdr->length = 15371da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 153827a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15391da177e4SLinus Torvalds 1540e0eb093eSAl Viro return 0; 15411da177e4SLinus Torvalds } 15421da177e4SLinus Torvalds 15431da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15441da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15451da177e4SLinus Torvalds */ 15461da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15471da177e4SLinus Torvalds { 1548ab3e5e7bSVlad Yasevich struct sctp_datamsg *msg; 1549ab3e5e7bSVlad Yasevich struct sctp_chunk *lchunk; 1550ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 15511da177e4SLinus Torvalds __u16 ssn; 15521da177e4SLinus Torvalds __u16 sid; 15531da177e4SLinus Torvalds 15541da177e4SLinus Torvalds if (chunk->has_ssn) 15551da177e4SLinus Torvalds return; 15561da177e4SLinus Torvalds 1557ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1558ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1559ab3e5e7bSVlad Yasevich stream = &chunk->asoc->ssnmap->out; 1560ab3e5e7bSVlad Yasevich 1561ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1562ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1563ab3e5e7bSVlad Yasevich */ 1564ab3e5e7bSVlad Yasevich msg = chunk->msg; 1565ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1566ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15671da177e4SLinus Torvalds ssn = 0; 15681da177e4SLinus Torvalds } else { 1569ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1570ab3e5e7bSVlad Yasevich ssn = sctp_ssn_next(stream, sid); 15711da177e4SLinus Torvalds else 1572ab3e5e7bSVlad Yasevich ssn = sctp_ssn_peek(stream, sid); 15731da177e4SLinus Torvalds } 15741da177e4SLinus Torvalds 1575ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1576ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1577ab3e5e7bSVlad Yasevich } 15781da177e4SLinus Torvalds } 15791da177e4SLinus Torvalds 15801da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15811da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15821da177e4SLinus Torvalds */ 15831da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15841da177e4SLinus Torvalds { 15851da177e4SLinus Torvalds if (!chunk->has_tsn) { 15861da177e4SLinus Torvalds /* This is the last possible instant to 15871da177e4SLinus Torvalds * assign a TSN. 15881da177e4SLinus Torvalds */ 15891da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15901da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15911da177e4SLinus Torvalds chunk->has_tsn = 1; 15921da177e4SLinus Torvalds } 15931da177e4SLinus Torvalds } 15941da177e4SLinus Torvalds 15951da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15961da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15973182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1598dd0fc66fSAl Viro gfp_t gfp) 15991da177e4SLinus Torvalds { 16001da177e4SLinus Torvalds struct sctp_association *asoc; 16011da177e4SLinus Torvalds struct sk_buff *skb; 16021da177e4SLinus Torvalds sctp_scope_t scope; 16031da177e4SLinus Torvalds struct sctp_af *af; 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds /* Create the bare association. */ 16061da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 16071da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 16081da177e4SLinus Torvalds if (!asoc) 16091da177e4SLinus Torvalds goto nodata; 16101da177e4SLinus Torvalds asoc->temp = 1; 16111da177e4SLinus Torvalds skb = chunk->skb; 16121da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1613eddc9ec5SArnaldo Carvalho de Melo af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version)); 16141da177e4SLinus Torvalds if (unlikely(!af)) 16151da177e4SLinus Torvalds goto fail; 1616d55c41b1SAl Viro af->from_skb(&asoc->c.peer_addr, skb, 1); 16171da177e4SLinus Torvalds nodata: 16181da177e4SLinus Torvalds return asoc; 16191da177e4SLinus Torvalds 16201da177e4SLinus Torvalds fail: 16211da177e4SLinus Torvalds sctp_association_free(asoc); 16221da177e4SLinus Torvalds return NULL; 16231da177e4SLinus Torvalds } 16241da177e4SLinus Torvalds 16251da177e4SLinus Torvalds /* Build a cookie representing asoc. 16261da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 16271da177e4SLinus Torvalds */ 16281da177e4SLinus Torvalds static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep, 16291da177e4SLinus Torvalds const struct sctp_association *asoc, 16301da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 16311da177e4SLinus Torvalds int *cookie_len, 16321da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len) 16331da177e4SLinus Torvalds { 16341da177e4SLinus Torvalds sctp_cookie_param_t *retval; 16351da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 16361da177e4SLinus Torvalds int headersize, bodysize; 16371da177e4SLinus Torvalds 16389834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16399834a2bbSVlad Yasevich * any padding. 16409834a2bbSVlad Yasevich */ 16419834a2bbSVlad Yasevich headersize = sizeof(sctp_paramhdr_t) + 16429834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16439834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16441da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16451da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16461da177e4SLinus Torvalds 16471da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16481da177e4SLinus Torvalds * functions simpler to write. 16491da177e4SLinus Torvalds */ 16501da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16511da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16521da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16531da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16541da177e4SLinus Torvalds 16551da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16561da177e4SLinus Torvalds * out on the network. 16571da177e4SLinus Torvalds */ 1658af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1659af997d8cSArnaldo Carvalho de Melo if (!retval) 1660af997d8cSArnaldo Carvalho de Melo goto nodata; 1661af997d8cSArnaldo Carvalho de Melo 16621da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16631da177e4SLinus Torvalds 16641da177e4SLinus Torvalds /* Set up the parameter header. */ 16651da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16661da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16691da177e4SLinus Torvalds cookie->c = asoc->c; 16701da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16711da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16721da177e4SLinus Torvalds 16731da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16741da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16751da177e4SLinus Torvalds 16760f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16770f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16781da177e4SLinus Torvalds 16791da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 168052db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 1681cb5e173eSMarcelo Ricardo Leitner ktime_get_real()); 16821da177e4SLinus Torvalds 16831da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16841da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16851da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16861da177e4SLinus Torvalds 16871da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16881da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16891da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16901da177e4SLinus Torvalds 16911da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16925821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 16935821c769SHerbert Xu int err; 16941b489e11SHerbert Xu 16951da177e4SLinus Torvalds /* Sign the message. */ 16965821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 16975821c769SHerbert Xu desc->flags = 0; 16981da177e4SLinus Torvalds 16995821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 17005821c769SHerbert Xu sizeof(ep->secret_key)) ?: 17015821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, 17025821c769SHerbert Xu cookie->signature); 17035821c769SHerbert Xu shash_desc_zero(desc); 17045821c769SHerbert Xu if (err) 17051b489e11SHerbert Xu goto free_cookie; 17061da177e4SLinus Torvalds } 17071da177e4SLinus Torvalds 17081da177e4SLinus Torvalds return retval; 17091b489e11SHerbert Xu 17101b489e11SHerbert Xu free_cookie: 17111b489e11SHerbert Xu kfree(retval); 17121b489e11SHerbert Xu nodata: 17131b489e11SHerbert Xu *cookie_len = 0; 17141b489e11SHerbert Xu return NULL; 17151da177e4SLinus Torvalds } 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 17181da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 17191da177e4SLinus Torvalds const struct sctp_endpoint *ep, 17201da177e4SLinus Torvalds const struct sctp_association *asoc, 1721dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 17221da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 17231da177e4SLinus Torvalds { 17241da177e4SLinus Torvalds struct sctp_association *retval = NULL; 17251da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 17261da177e4SLinus Torvalds struct sctp_cookie *bear_cookie; 17271da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1728313e7b4dSVlad Yasevich __u8 *digest = ep->digest; 1729570617e7SDaniel Borkmann unsigned int len; 17301da177e4SLinus Torvalds sctp_scope_t scope; 17311da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 173252db882fSDaniel Borkmann ktime_t kt; 17331da177e4SLinus Torvalds 17349834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17359834a2bbSVlad Yasevich * any padding. 17369834a2bbSVlad Yasevich */ 17379834a2bbSVlad Yasevich headersize = sizeof(sctp_chunkhdr_t) + 17389834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17399834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17401da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17411da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17421da177e4SLinus Torvalds 17431da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17441da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17451da177e4SLinus Torvalds * INIT chunk. 17461da177e4SLinus Torvalds */ 17471da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17481da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17491da177e4SLinus Torvalds goto malformed; 17501da177e4SLinus Torvalds 17511da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17521da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17531da177e4SLinus Torvalds goto malformed; 17541da177e4SLinus Torvalds 17551da177e4SLinus Torvalds /* Process the cookie. */ 17561da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17571da177e4SLinus Torvalds bear_cookie = &cookie->c; 17581da177e4SLinus Torvalds 17591da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17601da177e4SLinus Torvalds goto no_hmac; 17611da177e4SLinus Torvalds 17621da177e4SLinus Torvalds /* Check the signature. */ 17635821c769SHerbert Xu { 17645821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 17655821c769SHerbert Xu int err; 17661da177e4SLinus Torvalds 17675821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 17685821c769SHerbert Xu desc->flags = 0; 17695821c769SHerbert Xu 17705821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 17715821c769SHerbert Xu sizeof(ep->secret_key)) ?: 17725821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, 17735821c769SHerbert Xu digest); 17745821c769SHerbert Xu shash_desc_zero(desc); 17755821c769SHerbert Xu 17765821c769SHerbert Xu if (err) { 17771b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17781b489e11SHerbert Xu goto fail; 17791b489e11SHerbert Xu } 17805821c769SHerbert Xu } 17811da177e4SLinus Torvalds 17821da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17831da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17841da177e4SLinus Torvalds goto fail; 17851da177e4SLinus Torvalds } 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds no_hmac: 17881da177e4SLinus Torvalds /* IG Section 2.35.2: 17891da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17901da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17911da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17921da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17931da177e4SLinus Torvalds * discarded, 17941da177e4SLinus Torvalds */ 17951da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17961da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17971da177e4SLinus Torvalds goto fail; 17981da177e4SLinus Torvalds } 17991da177e4SLinus Torvalds 18009b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 18011da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 18021da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 18031da177e4SLinus Torvalds goto fail; 18041da177e4SLinus Torvalds } 18051da177e4SLinus Torvalds 18061da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 18071da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 18081da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1809f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1810f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1811f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1812f236218bSVlad Yasevich * down the new association establishment instead of every packet. 18131da177e4SLinus Torvalds */ 1814f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 181552db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1816f236218bSVlad Yasevich else 1817cb5e173eSMarcelo Ricardo Leitner kt = ktime_get_real(); 1818f236218bSVlad Yasevich 181967cb9366SDaniel Borkmann if (!asoc && ktime_before(bear_cookie->expiration, kt)) { 18201da177e4SLinus Torvalds /* 18211da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 18221da177e4SLinus Torvalds * 18231da177e4SLinus Torvalds * Cause of error 18241da177e4SLinus Torvalds * --------------- 18251da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 18261da177e4SLinus Torvalds * Cookie that has expired. 18271da177e4SLinus Torvalds */ 18281da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 18291da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18301da177e4SLinus Torvalds if (*errp) { 183152db882fSDaniel Borkmann suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 183234bcca28SAl Viro __be32 n = htonl(usecs); 18331da177e4SLinus Torvalds 18341da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 183500f1c2dfSWei Yongjun sizeof(n)); 183600f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 18371da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18381da177e4SLinus Torvalds } else 18391da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18401da177e4SLinus Torvalds 18411da177e4SLinus Torvalds goto fail; 18421da177e4SLinus Torvalds } 18431da177e4SLinus Torvalds 18441da177e4SLinus Torvalds /* Make a new base association. */ 18451da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18461da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18471da177e4SLinus Torvalds if (!retval) { 18481da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18491da177e4SLinus Torvalds goto fail; 18501da177e4SLinus Torvalds } 18511da177e4SLinus Torvalds 18521da177e4SLinus Torvalds /* Set up our peer's port number. */ 18531da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18541da177e4SLinus Torvalds 18551da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18561da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18571da177e4SLinus Torvalds 18581da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18591da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18601da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18611da177e4SLinus Torvalds goto fail; 18621da177e4SLinus Torvalds } 18631da177e4SLinus Torvalds 18641da177e4SLinus Torvalds /* Also, add the destination address. */ 18651da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1866f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1867133800d1SMarcelo Ricardo Leitner sizeof(chunk->dest), SCTP_ADDR_SRC, 1868133800d1SMarcelo Ricardo Leitner GFP_ATOMIC); 18691da177e4SLinus Torvalds } 18701da177e4SLinus Torvalds 18711da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18721da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18731da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 18741da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18751da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18760f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18771da177e4SLinus Torvalds 18781da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18791da177e4SLinus Torvalds return retval; 18801da177e4SLinus Torvalds 18811da177e4SLinus Torvalds fail: 18821da177e4SLinus Torvalds if (retval) 18831da177e4SLinus Torvalds sctp_association_free(retval); 18841da177e4SLinus Torvalds 18851da177e4SLinus Torvalds return NULL; 18861da177e4SLinus Torvalds 18871da177e4SLinus Torvalds malformed: 18881da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18891da177e4SLinus Torvalds * malformed. 18901da177e4SLinus Torvalds */ 18911da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18921da177e4SLinus Torvalds goto fail; 18931da177e4SLinus Torvalds } 18941da177e4SLinus Torvalds 18951da177e4SLinus Torvalds /******************************************************************** 18961da177e4SLinus Torvalds * 3rd Level Abstractions 18971da177e4SLinus Torvalds ********************************************************************/ 18981da177e4SLinus Torvalds 18991da177e4SLinus Torvalds struct __sctp_missing { 19009f81bcd9SAl Viro __be32 num_missing; 19019f81bcd9SAl Viro __be16 type; 1902bc10502dSEric Dumazet } __packed; 19031da177e4SLinus Torvalds 19041da177e4SLinus Torvalds /* 19051da177e4SLinus Torvalds * Report a missing mandatory parameter. 19061da177e4SLinus Torvalds */ 19071da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 19081da177e4SLinus Torvalds sctp_param_t paramtype, 19091da177e4SLinus Torvalds struct sctp_chunk *chunk, 19101da177e4SLinus Torvalds struct sctp_chunk **errp) 19111da177e4SLinus Torvalds { 19121da177e4SLinus Torvalds struct __sctp_missing report; 19131da177e4SLinus Torvalds __u16 len; 19141da177e4SLinus Torvalds 19151da177e4SLinus Torvalds len = WORD_ROUND(sizeof(report)); 19161da177e4SLinus Torvalds 19171da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 19181da177e4SLinus Torvalds * returning multiple unknown parameters. 19191da177e4SLinus Torvalds */ 19201da177e4SLinus Torvalds if (!*errp) 19211da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19221da177e4SLinus Torvalds 19231da177e4SLinus Torvalds if (*errp) { 19241da177e4SLinus Torvalds report.num_missing = htonl(1); 19251da177e4SLinus Torvalds report.type = paramtype; 1926ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 192700f1c2dfSWei Yongjun sizeof(report)); 192800f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 19291da177e4SLinus Torvalds } 19301da177e4SLinus Torvalds 19311da177e4SLinus Torvalds /* Stop processing this chunk. */ 19321da177e4SLinus Torvalds return 0; 19331da177e4SLinus Torvalds } 19341da177e4SLinus Torvalds 19351da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19361da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19371da177e4SLinus Torvalds struct sctp_chunk *chunk, 19381da177e4SLinus Torvalds struct sctp_chunk **errp) 19391da177e4SLinus Torvalds { 19401da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19411da177e4SLinus Torvalds 19421da177e4SLinus Torvalds if (!*errp) 19431da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19441da177e4SLinus Torvalds 19451da177e4SLinus Torvalds if (*errp) 194600f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19471da177e4SLinus Torvalds 19481da177e4SLinus Torvalds /* Stop processing this chunk. */ 19491da177e4SLinus Torvalds return 0; 19501da177e4SLinus Torvalds } 19511da177e4SLinus Torvalds 19521da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19531da177e4SLinus Torvalds struct sctp_paramhdr *param, 19541da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19551da177e4SLinus Torvalds struct sctp_chunk **errp) 19561da177e4SLinus Torvalds { 19577ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19587ab90804SVlad Yasevich * not reported. 19597ab90804SVlad Yasevich */ 19607ab90804SVlad Yasevich if (*errp) 19617ab90804SVlad Yasevich sctp_chunk_free(*errp); 19627ab90804SVlad Yasevich 19631da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1964ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19651da177e4SLinus Torvalds 19661da177e4SLinus Torvalds return 0; 19671da177e4SLinus Torvalds } 19681da177e4SLinus Torvalds 19691da177e4SLinus Torvalds 19701da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19711da177e4SLinus Torvalds * send back an indicator to the peer. 19721da177e4SLinus Torvalds */ 19731da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19741da177e4SLinus Torvalds union sctp_params param, 19751da177e4SLinus Torvalds struct sctp_chunk *chunk, 19761da177e4SLinus Torvalds struct sctp_chunk **errp) 19771da177e4SLinus Torvalds { 19781da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19791da177e4SLinus Torvalds 19807ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19817ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19827ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19837ab90804SVlad Yasevich * them in the ABORT. 19847ab90804SVlad Yasevich */ 19857ab90804SVlad Yasevich if (*errp) 19867ab90804SVlad Yasevich sctp_chunk_free(*errp); 19877ab90804SVlad Yasevich 19881da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19891da177e4SLinus Torvalds 199000f1c2dfSWei Yongjun if (*errp) { 199100f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 199200f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 199300f1c2dfSWei Yongjun } 19941da177e4SLinus Torvalds 19951da177e4SLinus Torvalds /* Stop processing this chunk. */ 19961da177e4SLinus Torvalds return 0; 19971da177e4SLinus Torvalds } 19981da177e4SLinus Torvalds 1999f53b5b09SEric W. Biederman static int sctp_verify_ext_param(struct net *net, union sctp_params param) 2000d6701191SVlad Yasevich { 2001d6701191SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 2002d6701191SVlad Yasevich int have_auth = 0; 2003d6701191SVlad Yasevich int have_asconf = 0; 2004d6701191SVlad Yasevich int i; 2005d6701191SVlad Yasevich 2006d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 2007d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 2008d6701191SVlad Yasevich case SCTP_CID_AUTH: 2009d6701191SVlad Yasevich have_auth = 1; 2010d6701191SVlad Yasevich break; 2011d6701191SVlad Yasevich case SCTP_CID_ASCONF: 2012d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2013d6701191SVlad Yasevich have_asconf = 1; 2014d6701191SVlad Yasevich break; 2015d6701191SVlad Yasevich } 2016d6701191SVlad Yasevich } 2017d6701191SVlad Yasevich 2018d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 2019d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 2020d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 2021d6701191SVlad Yasevich * mode. 2022d6701191SVlad Yasevich */ 2023e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 2024d6701191SVlad Yasevich return 1; 2025d6701191SVlad Yasevich 2026e1fc3b14SEric W. Biederman if (net->sctp.addip_enable && !have_auth && have_asconf) 2027d6701191SVlad Yasevich return 0; 2028d6701191SVlad Yasevich 2029d6701191SVlad Yasevich return 1; 2030d6701191SVlad Yasevich } 2031d6701191SVlad Yasevich 2032131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 2033131a47e3SVlad Yasevich union sctp_params param) 2034131a47e3SVlad Yasevich { 2035e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2036131a47e3SVlad Yasevich __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 2037131a47e3SVlad Yasevich int i; 2038131a47e3SVlad Yasevich 2039131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2040131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2041131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 204228aa4c26SXin Long if (asoc->prsctp_enable && !asoc->peer.prsctp_capable) 2043131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2044131a47e3SVlad Yasevich break; 2045730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2046730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2047730fc3d0SVlad Yasevich * supports AUTH. 2048730fc3d0SVlad Yasevich */ 2049b14878ccSVlad Yasevich if (asoc->ep->auth_enable) 2050730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2051730fc3d0SVlad Yasevich break; 2052131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2053131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2054e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 205588799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20566b2f9cb6SVlad Yasevich break; 2057131a47e3SVlad Yasevich default: 2058131a47e3SVlad Yasevich break; 2059131a47e3SVlad Yasevich } 2060131a47e3SVlad Yasevich } 2061131a47e3SVlad Yasevich } 2062131a47e3SVlad Yasevich 20631da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20641da177e4SLinus Torvalds * 20651da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20661da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20671da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20681da177e4SLinus Torvalds * Parameter Type. 20691da177e4SLinus Torvalds * 20707ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20717ab90804SVlad Yasevich * parameters within this chunk 20721da177e4SLinus Torvalds * 20737ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20747ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20757ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20761da177e4SLinus Torvalds * 20771da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20781da177e4SLinus Torvalds * 20791da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20801da177e4SLinus Torvalds * report the unrecognized parameter in an 20817ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20821da177e4SLinus Torvalds * 20831da177e4SLinus Torvalds * Return value: 20847ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20857ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20867ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20871da177e4SLinus Torvalds */ 20887ab90804SVlad Yasevich static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc, 20891da177e4SLinus Torvalds union sctp_params param, 20901da177e4SLinus Torvalds struct sctp_chunk *chunk, 20911da177e4SLinus Torvalds struct sctp_chunk **errp) 20921da177e4SLinus Torvalds { 20937ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20941da177e4SLinus Torvalds 20951da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20961da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20977ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20981da177e4SLinus Torvalds break; 20991da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 21001da177e4SLinus Torvalds break; 21017ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 21027ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 21037ab90804SVlad Yasevich /* Fall through */ 21041da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 21051da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 21061da177e4SLinus Torvalds * returning multiple unknown parameters. 21071da177e4SLinus Torvalds */ 21081da177e4SLinus Torvalds if (NULL == *errp) 21095fa782c2SNeil Horman *errp = sctp_make_op_error_fixed(asoc, chunk); 21101da177e4SLinus Torvalds 21111da177e4SLinus Torvalds if (*errp) { 21122205a6eaSJiri Bohac if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, 21132205a6eaSJiri Bohac WORD_ROUND(ntohs(param.p->length)))) 21145fa782c2SNeil Horman sctp_addto_chunk_fixed(*errp, 211500f1c2dfSWei Yongjun WORD_ROUND(ntohs(param.p->length)), 211600f1c2dfSWei Yongjun param.v); 21171da177e4SLinus Torvalds } else { 21181da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 21191da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 21201da177e4SLinus Torvalds * to the peer and the association won't be 21211da177e4SLinus Torvalds * established. 21221da177e4SLinus Torvalds */ 21237ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 21241da177e4SLinus Torvalds } 21251da177e4SLinus Torvalds break; 21261da177e4SLinus Torvalds default: 21271da177e4SLinus Torvalds break; 21281da177e4SLinus Torvalds } 21291da177e4SLinus Torvalds 21301da177e4SLinus Torvalds return retval; 21311da177e4SLinus Torvalds } 21321da177e4SLinus Torvalds 21337ab90804SVlad Yasevich /* Verify variable length parameters 21341da177e4SLinus Torvalds * Return values: 21357ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21367ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21377ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21387ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21391da177e4SLinus Torvalds */ 2140f53b5b09SEric W. Biederman static sctp_ierror_t sctp_verify_param(struct net *net, 2141b14878ccSVlad Yasevich const struct sctp_endpoint *ep, 2142f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21431da177e4SLinus Torvalds union sctp_params param, 21441da177e4SLinus Torvalds sctp_cid_t cid, 21451da177e4SLinus Torvalds struct sctp_chunk *chunk, 21461da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21471da177e4SLinus Torvalds { 214872da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21497ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 215072da7b38SWei Yongjun __u16 n_elt, id = 0; 215172da7b38SWei Yongjun int i; 21521da177e4SLinus Torvalds 21531da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21541da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21551da177e4SLinus Torvalds * identified based on the chunk id. 21561da177e4SLinus Torvalds */ 21571da177e4SLinus Torvalds 21581da177e4SLinus Torvalds switch (param.p->type) { 21591da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21601da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21611da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21621da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21631da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21641da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21651da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21661da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21670f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2168d6701191SVlad Yasevich break; 2169d6701191SVlad Yasevich 2170131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2171f53b5b09SEric W. Biederman if (!sctp_verify_ext_param(net, param)) 2172d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21731da177e4SLinus Torvalds break; 21741da177e4SLinus Torvalds 2175d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2176e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 2177d6de3097SVlad Yasevich break; 2178d6de3097SVlad Yasevich goto fallthrough; 2179d6de3097SVlad Yasevich 21801da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21811da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21827ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21837ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21847ab90804SVlad Yasevich break; 2185131a47e3SVlad Yasevich 21861da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 218728aa4c26SXin Long if (ep->prsctp_enable) 21881da177e4SLinus Torvalds break; 2189730fc3d0SVlad Yasevich goto fallthrough; 2190730fc3d0SVlad Yasevich 2191730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2192b14878ccSVlad Yasevich if (!ep->auth_enable) 2193730fc3d0SVlad Yasevich goto fallthrough; 2194730fc3d0SVlad Yasevich 2195730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2196730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2197730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2198730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2199730fc3d0SVlad Yasevich */ 2200730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 22017ab90804SVlad Yasevich ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) { 22027ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2203730fc3d0SVlad Yasevich chunk, err_chunk); 22047ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22057ab90804SVlad Yasevich } 2206730fc3d0SVlad Yasevich break; 2207730fc3d0SVlad Yasevich 2208730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2209b14878ccSVlad Yasevich if (!ep->auth_enable) 2210730fc3d0SVlad Yasevich goto fallthrough; 2211730fc3d0SVlad Yasevich 2212730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2213730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2214730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2215730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2216730fc3d0SVlad Yasevich */ 22177ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 22187ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2219730fc3d0SVlad Yasevich chunk, err_chunk); 22207ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22217ab90804SVlad Yasevich } 2222730fc3d0SVlad Yasevich break; 2223730fc3d0SVlad Yasevich 2224730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2225b14878ccSVlad Yasevich if (!ep->auth_enable) 222672da7b38SWei Yongjun goto fallthrough; 222772da7b38SWei Yongjun 222872da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 222972da7b38SWei Yongjun n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1; 223072da7b38SWei Yongjun 223172da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 223272da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 223372da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 223472da7b38SWei Yongjun */ 223572da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 223672da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 223772da7b38SWei Yongjun 223872da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2239730fc3d0SVlad Yasevich break; 224072da7b38SWei Yongjun } 224172da7b38SWei Yongjun 224272da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 224372da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 224472da7b38SWei Yongjun err_chunk); 224572da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 224672da7b38SWei Yongjun } 224772da7b38SWei Yongjun break; 2248730fc3d0SVlad Yasevich fallthrough: 22491da177e4SLinus Torvalds default: 2250bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2251bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2252bb33381dSDaniel Borkmann 22537ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22541da177e4SLinus Torvalds break; 22551da177e4SLinus Torvalds } 22561da177e4SLinus Torvalds return retval; 22571da177e4SLinus Torvalds } 22581da177e4SLinus Torvalds 22591da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2260b14878ccSVlad Yasevich int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 2261b14878ccSVlad Yasevich const struct sctp_association *asoc, sctp_cid_t cid, 2262b14878ccSVlad Yasevich sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk, 22631da177e4SLinus Torvalds struct sctp_chunk **errp) 22641da177e4SLinus Torvalds { 22651da177e4SLinus Torvalds union sctp_params param; 22667613f5feSDaniel Borkmann bool has_cookie = false; 22677ab90804SVlad Yasevich int result; 22681da177e4SLinus Torvalds 22697613f5feSDaniel Borkmann /* Check for missing mandatory parameters. Note: Initial TSN is 22707613f5feSDaniel Borkmann * also mandatory, but is not checked here since the valid range 22717613f5feSDaniel Borkmann * is 0..2**32-1. RFC4960, section 3.3.3. 22727613f5feSDaniel Borkmann */ 22737613f5feSDaniel Borkmann if (peer_init->init_hdr.num_outbound_streams == 0 || 22747613f5feSDaniel Borkmann peer_init->init_hdr.num_inbound_streams == 0 || 22757613f5feSDaniel Borkmann peer_init->init_hdr.init_tag == 0 || 22767613f5feSDaniel Borkmann ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) 22777ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22781da177e4SLinus Torvalds 22791da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22807613f5feSDaniel Borkmann if (param.p->type == SCTP_PARAM_STATE_COOKIE) 22817613f5feSDaniel Borkmann has_cookie = true; 22827613f5feSDaniel Borkmann } 22831da177e4SLinus Torvalds 22841da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22851da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22861da177e4SLinus Torvalds * The current param.p would point at the bad one. 22871da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22881da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22891da177e4SLinus Torvalds * error handling code build and send the packet. 22901da177e4SLinus Torvalds */ 22917ab90804SVlad Yasevich if (param.v != (void *)chunk->chunk_end) 22927ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22931da177e4SLinus Torvalds 22941da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22951da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22961da177e4SLinus Torvalds */ 22977ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22987ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22991da177e4SLinus Torvalds chunk, errp); 23001da177e4SLinus Torvalds 23017ab90804SVlad Yasevich /* Verify all the variable length parameters */ 23021da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2303b14878ccSVlad Yasevich result = sctp_verify_param(net, ep, asoc, param, cid, 2304b14878ccSVlad Yasevich chunk, errp); 23057ab90804SVlad Yasevich switch (result) { 23067ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 23077ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 23081da177e4SLinus Torvalds return 0; 23097ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 23101da177e4SLinus Torvalds return 1; 23117ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 23127ab90804SVlad Yasevich default: 23137ab90804SVlad Yasevich break; 23141da177e4SLinus Torvalds } 23151da177e4SLinus Torvalds 23161da177e4SLinus Torvalds } /* for (loop through all parameters) */ 23171da177e4SLinus Torvalds 23181da177e4SLinus Torvalds return 1; 23191da177e4SLinus Torvalds } 23201da177e4SLinus Torvalds 23211da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 23221da177e4SLinus Torvalds * Returns 0 on failure, else success. 23231da177e4SLinus Torvalds * FIXME: This is an association method. 23241da177e4SLinus Torvalds */ 2325de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 23261da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2327dd0fc66fSAl Viro sctp_init_chunk_t *peer_init, gfp_t gfp) 23281da177e4SLinus Torvalds { 2329e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 23301da177e4SLinus Torvalds union sctp_params param; 23311da177e4SLinus Torvalds struct sctp_transport *transport; 23321da177e4SLinus Torvalds struct list_head *pos, *temp; 2333de6becdcSWei Yongjun struct sctp_af *af; 2334de6becdcSWei Yongjun union sctp_addr addr; 23351da177e4SLinus Torvalds char *cookie; 2336de6becdcSWei Yongjun int src_match = 0; 23371da177e4SLinus Torvalds 23381da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23391da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23401da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23411da177e4SLinus Torvalds * of the INIT from the cookie. 23421da177e4SLinus Torvalds */ 23431da177e4SLinus Torvalds 23441da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23451da177e4SLinus Torvalds * added as the primary transport. The source address seems to 23461da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 23471da177e4SLinus Torvalds */ 23486a1e5f33SAl Viro if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23491da177e4SLinus Torvalds goto nomem; 2350de6becdcSWei Yongjun 2351de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2352de6becdcSWei Yongjun src_match = 1; 23531da177e4SLinus Torvalds 23541da177e4SLinus Torvalds /* Process the initialization parameters. */ 23551da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2356de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2357de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2358de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2359de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2360de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2361de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2362de6becdcSWei Yongjun src_match = 1; 2363de6becdcSWei Yongjun } 23641da177e4SLinus Torvalds 23651da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23661da177e4SLinus Torvalds goto clean_up; 23671da177e4SLinus Torvalds } 23681da177e4SLinus Torvalds 2369de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2370de6becdcSWei Yongjun if (!src_match) 2371de6becdcSWei Yongjun goto clean_up; 2372de6becdcSWei Yongjun 2373730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2374730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2375730fc3d0SVlad Yasevich */ 2376730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2377730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2378730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2379730fc3d0SVlad Yasevich 2380d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2381d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2382d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2383d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2384d6701191SVlad Yasevich * is what we'll do here. 23856b2f9cb6SVlad Yasevich */ 2386e1fc3b14SEric W. Biederman if (!net->sctp.addip_noauth && 238773d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23886b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23896b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23906b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 239188799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2392d6701191SVlad Yasevich goto clean_up; 23936b2f9cb6SVlad Yasevich } 23946b2f9cb6SVlad Yasevich 23953f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23963f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23973f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23983f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23993f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 24003f7a87d2SFrank Filz } 24013f7a87d2SFrank Filz } 24023f7a87d2SFrank Filz 24031da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 24041da177e4SLinus Torvalds * order. 24051da177e4SLinus Torvalds */ 24061da177e4SLinus Torvalds asoc->peer.i.init_tag = 24071da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 24081da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 24091da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 24101da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 24111da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24121da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 24131da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24141da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 24151da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 24161da177e4SLinus Torvalds 24171da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 24181da177e4SLinus Torvalds * number of inbound streams. 24191da177e4SLinus Torvalds */ 24201da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 24211da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 24221da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 24231da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24241da177e4SLinus Torvalds } 24251da177e4SLinus Torvalds 24261da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 24271da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 24281da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 24291da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24301da177e4SLinus Torvalds } 24311da177e4SLinus Torvalds 24321da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 24331da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 24341da177e4SLinus Torvalds 24351da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24361da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24371da177e4SLinus Torvalds 24381da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 24391da177e4SLinus Torvalds cookie = asoc->peer.cookie; 24401da177e4SLinus Torvalds if (cookie) { 2441af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 24421da177e4SLinus Torvalds if (!asoc->peer.cookie) 24431da177e4SLinus Torvalds goto clean_up; 24441da177e4SLinus Torvalds } 24451da177e4SLinus Torvalds 24461da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24471da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24481da177e4SLinus Torvalds * advertised window). 24491da177e4SLinus Torvalds */ 24509dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24519dbc15f0SRobert P. J. Day transports) { 24521da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24531da177e4SLinus Torvalds } 24541da177e4SLinus Torvalds 24551da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24568e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24578e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24588e1ee18cSVlad Yasevich goto clean_up; 24591da177e4SLinus Torvalds 24601da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24611da177e4SLinus Torvalds * 24621da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24631da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24641da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24651da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24661da177e4SLinus Torvalds */ 24671da177e4SLinus Torvalds 24683f7a87d2SFrank Filz /* Allocate storage for the negotiated streams if it is not a temporary 24693f7a87d2SFrank Filz * association. 24701da177e4SLinus Torvalds */ 24711da177e4SLinus Torvalds if (!asoc->temp) { 24721da177e4SLinus Torvalds int error; 24731da177e4SLinus Torvalds 24741da177e4SLinus Torvalds asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, 24751da177e4SLinus Torvalds asoc->c.sinit_num_ostreams, gfp); 24761da177e4SLinus Torvalds if (!asoc->ssnmap) 24771da177e4SLinus Torvalds goto clean_up; 24781da177e4SLinus Torvalds 247907d93967SVlad Yasevich error = sctp_assoc_set_id(asoc, gfp); 248007d93967SVlad Yasevich if (error) 24811da177e4SLinus Torvalds goto clean_up; 24821da177e4SLinus Torvalds } 24831da177e4SLinus Torvalds 24841da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24851da177e4SLinus Torvalds * 24861da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24871da177e4SLinus Torvalds * remote endpoint it should do the following: 24881da177e4SLinus Torvalds * ... 24891da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24901da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24911da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24921da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24931da177e4SLinus Torvalds */ 24941da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24951da177e4SLinus Torvalds return 1; 24961da177e4SLinus Torvalds 24971da177e4SLinus Torvalds clean_up: 24981da177e4SLinus Torvalds /* Release the transport structures. */ 24991da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 25001da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2501add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2502add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 25031da177e4SLinus Torvalds } 25043f7a87d2SFrank Filz 25051da177e4SLinus Torvalds nomem: 25061da177e4SLinus Torvalds return 0; 25071da177e4SLinus Torvalds } 25081da177e4SLinus Torvalds 25091da177e4SLinus Torvalds 25101da177e4SLinus Torvalds /* Update asoc with the option described in param. 25111da177e4SLinus Torvalds * 25121da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 25131da177e4SLinus Torvalds * 25141da177e4SLinus Torvalds * asoc is the association to update. 25151da177e4SLinus Torvalds * param is the variable length parameter to use for update. 25161da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 25171da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 25181da177e4SLinus Torvalds * work we do. In particular, we should not build transport 25191da177e4SLinus Torvalds * structures for the addresses. 25201da177e4SLinus Torvalds */ 25211da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 25221da177e4SLinus Torvalds union sctp_params param, 25231da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2524dd0fc66fSAl Viro gfp_t gfp) 25251da177e4SLinus Torvalds { 2526e7ff4a70SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 25271da177e4SLinus Torvalds union sctp_addr addr; 25281da177e4SLinus Torvalds int i; 25291da177e4SLinus Torvalds __u16 sat; 25301da177e4SLinus Torvalds int retval = 1; 25311da177e4SLinus Torvalds sctp_scope_t scope; 25323ef0a25bSArnd Bergmann u32 stale; 25331da177e4SLinus Torvalds struct sctp_af *af; 2534d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2535d6de3097SVlad Yasevich struct sctp_transport *t; 2536b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 25371da177e4SLinus Torvalds 25381da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25391da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25401da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25411da177e4SLinus Torvalds */ 25421da177e4SLinus Torvalds switch (param.p->type) { 25431da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25441da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25451da177e4SLinus Torvalds break; 25467dab83deSVlad Yasevich goto do_addr_param; 25477dab83deSVlad Yasevich 25481da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25497dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25507dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25517dab83deSVlad Yasevich break; 25527dab83deSVlad Yasevich do_addr_param: 25531da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2554dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25551da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2556e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2557dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25581da177e4SLinus Torvalds return 0; 25591da177e4SLinus Torvalds break; 25601da177e4SLinus Torvalds 25611da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2562e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25631da177e4SLinus Torvalds break; 25641da177e4SLinus Torvalds 25651da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25661da177e4SLinus Torvalds 25671da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25681da177e4SLinus Torvalds * (1/1000sec). 25691da177e4SLinus Torvalds */ 257052db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25711da177e4SLinus Torvalds break; 25721da177e4SLinus Torvalds 25731da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2574bb33381dSDaniel Borkmann pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); 25751da177e4SLinus Torvalds break; 25761da177e4SLinus Torvalds 25771da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25781da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25791da177e4SLinus Torvalds * ones are really set by the peer. 25801da177e4SLinus Torvalds */ 25811da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25821da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25831da177e4SLinus Torvalds 2584140ee960SGui Jianfeng /* Assume that peer supports the address family 2585140ee960SGui Jianfeng * by which it sends a packet. 2586140ee960SGui Jianfeng */ 2587140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2588140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2589140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2590140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2591140ee960SGui Jianfeng 25921da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25931da177e4SLinus Torvalds sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 25941da177e4SLinus Torvalds if (sat) 25951da177e4SLinus Torvalds sat /= sizeof(__u16); 25961da177e4SLinus Torvalds 25971da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25981da177e4SLinus Torvalds switch (param.sat->types[i]) { 25991da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 26001da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 26011da177e4SLinus Torvalds break; 26021da177e4SLinus Torvalds 26031da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 26046e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 26051da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 26061da177e4SLinus Torvalds break; 26071da177e4SLinus Torvalds 26081da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 26091da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 26101da177e4SLinus Torvalds break; 26111da177e4SLinus Torvalds 26121da177e4SLinus Torvalds default: /* Just ignore anything else. */ 26131da177e4SLinus Torvalds break; 26143ff50b79SStephen Hemminger } 26151da177e4SLinus Torvalds } 26161da177e4SLinus Torvalds break; 26171da177e4SLinus Torvalds 26181da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 26191da177e4SLinus Torvalds asoc->peer.cookie_len = 26201da177e4SLinus Torvalds ntohs(param.p->length) - sizeof(sctp_paramhdr_t); 26211da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 26221da177e4SLinus Torvalds break; 26231da177e4SLinus Torvalds 26241da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 26251da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 26261da177e4SLinus Torvalds break; 26271da177e4SLinus Torvalds 26281da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 26291da177e4SLinus Torvalds /* Rejected during verify stage. */ 26301da177e4SLinus Torvalds break; 26311da177e4SLinus Torvalds 26321da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 26331da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 26341da177e4SLinus Torvalds break; 26351da177e4SLinus Torvalds 26360f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2637e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26381da177e4SLinus Torvalds break; 26391da177e4SLinus Torvalds 2640d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2641e1fc3b14SEric W. Biederman if (!net->sctp.addip_enable) 26420ef46e28SVlad Yasevich goto fall_through; 26430ef46e28SVlad Yasevich 2644d6de3097SVlad Yasevich addr_param = param.v + sizeof(sctp_addip_param_t); 2645d6de3097SVlad Yasevich 2646cfbf654eSSaran Maruti Ramanara af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 2647e40607cbSDaniel Borkmann if (af == NULL) 2648e40607cbSDaniel Borkmann break; 2649e40607cbSDaniel Borkmann 2650d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2651d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2652d6de3097SVlad Yasevich 2653d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2654d6de3097SVlad Yasevich * XXX: see spec for what to do. 2655d6de3097SVlad Yasevich */ 2656d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2657d6de3097SVlad Yasevich break; 2658d6de3097SVlad Yasevich 2659d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2660d6de3097SVlad Yasevich if (!t) 2661d6de3097SVlad Yasevich break; 2662d6de3097SVlad Yasevich 2663d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2664d6de3097SVlad Yasevich break; 2665d6de3097SVlad Yasevich 2666131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2667131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2668131a47e3SVlad Yasevich break; 2669131a47e3SVlad Yasevich 26701da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 267128aa4c26SXin Long if (asoc->prsctp_enable) { 26721da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26731da177e4SLinus Torvalds break; 26741da177e4SLinus Torvalds } 26751da177e4SLinus Torvalds /* Fall Through */ 2676730fc3d0SVlad Yasevich goto fall_through; 2677730fc3d0SVlad Yasevich 2678730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2679b14878ccSVlad Yasevich if (!ep->auth_enable) 2680730fc3d0SVlad Yasevich goto fall_through; 2681730fc3d0SVlad Yasevich 2682730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2683730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2684730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2685730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2686730fc3d0SVlad Yasevich retval = 0; 2687730fc3d0SVlad Yasevich break; 2688730fc3d0SVlad Yasevich } 2689730fc3d0SVlad Yasevich break; 2690730fc3d0SVlad Yasevich 2691730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2692b14878ccSVlad Yasevich if (!ep->auth_enable) 2693730fc3d0SVlad Yasevich goto fall_through; 2694730fc3d0SVlad Yasevich 2695730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2696730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2697730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2698730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2699730fc3d0SVlad Yasevich retval = 0; 2700730fc3d0SVlad Yasevich break; 2701730fc3d0SVlad Yasevich } 2702730fc3d0SVlad Yasevich 2703730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2704730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2705730fc3d0SVlad Yasevich break; 2706730fc3d0SVlad Yasevich 2707730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2708b14878ccSVlad Yasevich if (!ep->auth_enable) 2709730fc3d0SVlad Yasevich goto fall_through; 2710730fc3d0SVlad Yasevich 2711730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2712730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2713730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2714730fc3d0SVlad Yasevich retval = 0; 2715730fc3d0SVlad Yasevich break; 2716730fc3d0SVlad Yasevich fall_through: 27171da177e4SLinus Torvalds default: 27181da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 27191da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 27201da177e4SLinus Torvalds * called prior to this routine. Simply log the error 27211da177e4SLinus Torvalds * here. 27221da177e4SLinus Torvalds */ 2723bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2724bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 27251da177e4SLinus Torvalds break; 27263ff50b79SStephen Hemminger } 27271da177e4SLinus Torvalds 27281da177e4SLinus Torvalds return retval; 27291da177e4SLinus Torvalds } 27301da177e4SLinus Torvalds 27311da177e4SLinus Torvalds /* Select a new verification tag. */ 27321da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 27331da177e4SLinus Torvalds { 27341da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 27351da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 27361da177e4SLinus Torvalds */ 27371da177e4SLinus Torvalds __u32 x; 27381da177e4SLinus Torvalds 27391da177e4SLinus Torvalds do { 27401da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27411da177e4SLinus Torvalds } while (x == 0); 27421da177e4SLinus Torvalds 27431da177e4SLinus Torvalds return x; 27441da177e4SLinus Torvalds } 27451da177e4SLinus Torvalds 27461da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27471da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27481da177e4SLinus Torvalds { 27491da177e4SLinus Torvalds __u32 retval; 27501da177e4SLinus Torvalds 27511da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27521da177e4SLinus Torvalds return retval; 27531da177e4SLinus Torvalds } 27541da177e4SLinus Torvalds 27551da177e4SLinus Torvalds /* 27561da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27571da177e4SLinus Torvalds * 0 1 2 3 27581da177e4SLinus 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 27591da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27601da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27611da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27621da177e4SLinus Torvalds * | Serial Number | 27631da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27641da177e4SLinus Torvalds * | Address Parameter | 27651da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27661da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27671da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27681da177e4SLinus Torvalds * \ \ 27691da177e4SLinus Torvalds * / .... / 27701da177e4SLinus Torvalds * \ \ 27711da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27721da177e4SLinus Torvalds * | ASCONF Parameter #N | 27731da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27741da177e4SLinus Torvalds * 27751da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27761da177e4SLinus Torvalds */ 27771da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27781da177e4SLinus Torvalds union sctp_addr *addr, 27791da177e4SLinus Torvalds 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 union sctp_addr_param addrparam; 27851da177e4SLinus Torvalds int addrlen; 27861da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27871da177e4SLinus Torvalds 27881da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27891da177e4SLinus Torvalds if (!addrlen) 27901da177e4SLinus Torvalds return NULL; 27911da177e4SLinus Torvalds length += addrlen; 27921da177e4SLinus Torvalds 27931da177e4SLinus Torvalds /* Create the chunk. */ 2794cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, 2795cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 27961da177e4SLinus Torvalds if (!retval) 27971da177e4SLinus Torvalds return NULL; 27981da177e4SLinus Torvalds 27991da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 28001da177e4SLinus Torvalds 28011da177e4SLinus Torvalds retval->subh.addip_hdr = 28021da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 28031da177e4SLinus Torvalds retval->param_hdr.v = 28041da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 28051da177e4SLinus Torvalds 28061da177e4SLinus Torvalds return retval; 28071da177e4SLinus Torvalds } 28081da177e4SLinus Torvalds 28091da177e4SLinus Torvalds /* ADDIP 28101da177e4SLinus Torvalds * 3.2.1 Add IP Address 28111da177e4SLinus Torvalds * 0 1 2 3 28121da177e4SLinus 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 28131da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28141da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 28151da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28161da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28171da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28181da177e4SLinus Torvalds * | Address Parameter | 28191da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28201da177e4SLinus Torvalds * 28211da177e4SLinus Torvalds * 3.2.2 Delete IP Address 28221da177e4SLinus Torvalds * 0 1 2 3 28231da177e4SLinus 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 28241da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28251da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 28261da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28271da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28281da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28291da177e4SLinus Torvalds * | Address Parameter | 28301da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28311da177e4SLinus Torvalds * 28321da177e4SLinus Torvalds */ 28331da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 28341da177e4SLinus Torvalds union sctp_addr *laddr, 28351da177e4SLinus Torvalds struct sockaddr *addrs, 28361da177e4SLinus Torvalds int addrcnt, 2837dbc16db1SAl Viro __be16 flags) 28381da177e4SLinus Torvalds { 28391da177e4SLinus Torvalds sctp_addip_param_t param; 28401da177e4SLinus Torvalds struct sctp_chunk *retval; 28411da177e4SLinus Torvalds union sctp_addr_param addr_param; 28421da177e4SLinus Torvalds union sctp_addr *addr; 28431da177e4SLinus Torvalds void *addr_buf; 28441da177e4SLinus Torvalds struct sctp_af *af; 28451da177e4SLinus Torvalds int paramlen = sizeof(param); 28461da177e4SLinus Torvalds int addr_param_len = 0; 28471da177e4SLinus Torvalds int totallen = 0; 28481da177e4SLinus Torvalds int i; 28498a07eb0aSMichio Honda int del_pickup = 0; 28501da177e4SLinus Torvalds 28511da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28521da177e4SLinus Torvalds addr_buf = addrs; 28531da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2854ea110733SJoe Perches addr = addr_buf; 28551da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28561da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28571da177e4SLinus Torvalds 28581da177e4SLinus Torvalds totallen += paramlen; 28591da177e4SLinus Torvalds totallen += addr_param_len; 28601da177e4SLinus Torvalds 28611da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28628a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28638a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28648a07eb0aSMichio Honda totallen += paramlen; 28658a07eb0aSMichio Honda totallen += addr_param_len; 28668a07eb0aSMichio Honda del_pickup = 1; 2867bb33381dSDaniel Borkmann 2868bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2869bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2870bb33381dSDaniel Borkmann __func__, totallen); 28718a07eb0aSMichio Honda } 28721da177e4SLinus Torvalds } 28731da177e4SLinus Torvalds 28741da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28751da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28761da177e4SLinus Torvalds if (!retval) 28771da177e4SLinus Torvalds return NULL; 28781da177e4SLinus Torvalds 28791da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28801da177e4SLinus Torvalds addr_buf = addrs; 28811da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2882ea110733SJoe Perches addr = addr_buf; 28831da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28841da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28851da177e4SLinus Torvalds param.param_hdr.type = flags; 28861da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 28871da177e4SLinus Torvalds param.crr_id = i; 28881da177e4SLinus Torvalds 28891da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28901da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28911da177e4SLinus Torvalds 28921da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28931da177e4SLinus Torvalds } 28948a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28958a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28968a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28978a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28988a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28998a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 29008a07eb0aSMichio Honda param.crr_id = i; 29018a07eb0aSMichio Honda 29028a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 29038a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 29048a07eb0aSMichio Honda } 29051da177e4SLinus Torvalds return retval; 29061da177e4SLinus Torvalds } 29071da177e4SLinus Torvalds 29081da177e4SLinus Torvalds /* ADDIP 29091da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 29101da177e4SLinus Torvalds * 0 1 2 3 29111da177e4SLinus 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 29121da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29131da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 29141da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29151da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 29161da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29171da177e4SLinus Torvalds * | Address Parameter | 29181da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29191da177e4SLinus Torvalds * 29201da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 29211da177e4SLinus Torvalds */ 29221da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 29231da177e4SLinus Torvalds union sctp_addr *addr) 29241da177e4SLinus Torvalds { 29251da177e4SLinus Torvalds sctp_addip_param_t param; 29261da177e4SLinus Torvalds struct sctp_chunk *retval; 29271da177e4SLinus Torvalds int len = sizeof(param); 29281da177e4SLinus Torvalds union sctp_addr_param addrparam; 29291da177e4SLinus Torvalds int addrlen; 29301da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 29311da177e4SLinus Torvalds 29321da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 29331da177e4SLinus Torvalds if (!addrlen) 29341da177e4SLinus Torvalds return NULL; 29351da177e4SLinus Torvalds len += addrlen; 29361da177e4SLinus Torvalds 29371da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 29381da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 29391da177e4SLinus Torvalds if (!retval) 29401da177e4SLinus Torvalds return NULL; 29411da177e4SLinus Torvalds 29421da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29431da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29441da177e4SLinus Torvalds param.crr_id = 0; 29451da177e4SLinus Torvalds 29461da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29471da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29481da177e4SLinus Torvalds 29491da177e4SLinus Torvalds return retval; 29501da177e4SLinus Torvalds } 29511da177e4SLinus Torvalds 29521da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29531da177e4SLinus Torvalds * 0 1 2 3 29541da177e4SLinus 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 29551da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29561da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29571da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29581da177e4SLinus Torvalds * | Serial Number | 29591da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29601da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29611da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29621da177e4SLinus Torvalds * \ \ 29631da177e4SLinus Torvalds * / .... / 29641da177e4SLinus Torvalds * \ \ 29651da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29661da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29671da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29681da177e4SLinus Torvalds * 29691da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29701da177e4SLinus Torvalds */ 29711da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29721da177e4SLinus Torvalds __u32 serial, int vparam_len) 29731da177e4SLinus Torvalds { 29741da177e4SLinus Torvalds sctp_addiphdr_t asconf; 29751da177e4SLinus Torvalds struct sctp_chunk *retval; 29761da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29771da177e4SLinus Torvalds 29781da177e4SLinus Torvalds /* Create the chunk. */ 2979cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, 2980cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 29811da177e4SLinus Torvalds if (!retval) 29821da177e4SLinus Torvalds return NULL; 29831da177e4SLinus Torvalds 29841da177e4SLinus Torvalds asconf.serial = htonl(serial); 29851da177e4SLinus Torvalds 29861da177e4SLinus Torvalds retval->subh.addip_hdr = 29871da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29881da177e4SLinus Torvalds 29891da177e4SLinus Torvalds return retval; 29901da177e4SLinus Torvalds } 29911da177e4SLinus Torvalds 29921da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29939f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 2994dbc16db1SAl Viro __be16 err_code, sctp_addip_param_t *asconf_param) 29951da177e4SLinus Torvalds { 29961da177e4SLinus Torvalds sctp_addip_param_t ack_param; 29971da177e4SLinus Torvalds sctp_errhdr_t err_param; 29981da177e4SLinus Torvalds int asconf_param_len = 0; 29991da177e4SLinus Torvalds int err_param_len = 0; 3000dbc16db1SAl Viro __be16 response_type; 30011da177e4SLinus Torvalds 30021da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 30031da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 30041da177e4SLinus Torvalds } else { 30051da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 30061da177e4SLinus Torvalds err_param_len = sizeof(err_param); 30071da177e4SLinus Torvalds if (asconf_param) 30081da177e4SLinus Torvalds asconf_param_len = 30091da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 30101da177e4SLinus Torvalds } 30111da177e4SLinus Torvalds 30121da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 30131da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 30141da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 30151da177e4SLinus Torvalds err_param_len + 30161da177e4SLinus Torvalds asconf_param_len); 30171da177e4SLinus Torvalds ack_param.crr_id = crr_id; 30181da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 30191da177e4SLinus Torvalds 30201da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 30211da177e4SLinus Torvalds return; 30221da177e4SLinus Torvalds 30231da177e4SLinus Torvalds /* Add Error Cause parameter. */ 30241da177e4SLinus Torvalds err_param.cause = err_code; 30251da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 30261da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 30271da177e4SLinus Torvalds 30281da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 30291da177e4SLinus Torvalds if (asconf_param) 30301da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 30311da177e4SLinus Torvalds } 30321da177e4SLinus Torvalds 30331da177e4SLinus Torvalds /* Process a asconf parameter. */ 3034dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 30351da177e4SLinus Torvalds struct sctp_chunk *asconf, 30361da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 30371da177e4SLinus Torvalds { 30381da177e4SLinus Torvalds struct sctp_transport *peer; 30391da177e4SLinus Torvalds struct sctp_af *af; 30401da177e4SLinus Torvalds union sctp_addr addr; 30411da177e4SLinus Torvalds union sctp_addr_param *addr_param; 30421da177e4SLinus Torvalds 3043ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 3044c1cc678aSPatrick McHardy 304544e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 304644e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 304744e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 304844e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 304944e65c1eSWei Yongjun 30506a435732SShan Wei switch (addr_param->p.type) { 3051c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 3052c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 3053945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3054c4492586SWei Yongjun break; 3055c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 3056c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 3057945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3058c4492586SWei Yongjun break; 3059c4492586SWei Yongjun default: 3060945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3061c4492586SWei Yongjun } 3062c4492586SWei Yongjun 30636a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30641da177e4SLinus Torvalds if (unlikely(!af)) 3065945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30661da177e4SLinus Torvalds 3067dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 306842e30bf3SVlad Yasevich 306942e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 307042e30bf3SVlad Yasevich * or multicast address. 307142e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 307242e30bf3SVlad Yasevich * make sure we check for that) 307342e30bf3SVlad Yasevich */ 307442e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3075945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 307642e30bf3SVlad Yasevich 30771da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30781da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 307942e30bf3SVlad Yasevich /* Section 4.2.1: 308042e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 308142e30bf3SVlad Yasevich * address of the packet MUST be added. 308242e30bf3SVlad Yasevich */ 308342e30bf3SVlad Yasevich if (af->is_any(&addr)) 308442e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 308542e30bf3SVlad Yasevich 30861da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30871da177e4SLinus Torvalds * request and does not have the local resources to add this 30881da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30891da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30901da177e4SLinus Torvalds * Due to Resource Shortage'. 30911da177e4SLinus Torvalds */ 30921da177e4SLinus Torvalds 3093dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30941da177e4SLinus Torvalds if (!peer) 30951da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30961da177e4SLinus Torvalds 30971da177e4SLinus Torvalds /* Start the heartbeat timer. */ 3098ba6f5e33SMarcelo Ricardo Leitner sctp_transport_reset_hb_timer(peer); 30996af29cccSMichio Honda asoc->new_transport = peer; 31001da177e4SLinus Torvalds break; 31011da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 31021da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 31031da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 31041da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 31051da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 31061da177e4SLinus Torvalds */ 310742e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 31081da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 31091da177e4SLinus Torvalds 31101da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 31111da177e4SLinus Torvalds * address which is also the source address of the IP packet 31121da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 31131da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 31141da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 31151da177e4SLinus Torvalds * Delete Source IP Address' 31161da177e4SLinus Torvalds */ 3117b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 31181da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 31191da177e4SLinus Torvalds 312042e30bf3SVlad Yasevich /* Section 4.2.2 312142e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 312242e30bf3SVlad Yasevich * addresses of the peer except the source address of the 312342e30bf3SVlad Yasevich * packet MUST be deleted. 312442e30bf3SVlad Yasevich */ 312542e30bf3SVlad Yasevich if (af->is_any(&addr)) { 312642e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 312742e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 312842e30bf3SVlad Yasevich asconf->transport); 31297c5a9461Slucien return SCTP_ERROR_NO_ERROR; 31307c5a9461Slucien } 31317c5a9461Slucien 31327c5a9461Slucien /* If the address is not part of the association, the 31337c5a9461Slucien * ASCONF-ACK with Error Cause Indication Parameter 31347c5a9461Slucien * which including cause of Unresolvable Address should 31357c5a9461Slucien * be sent. 31367c5a9461Slucien */ 31377c5a9461Slucien peer = sctp_assoc_lookup_paddr(asoc, &addr); 31387c5a9461Slucien if (!peer) 31397c5a9461Slucien return SCTP_ERROR_DNS_FAILED; 31407c5a9461Slucien 31417c5a9461Slucien sctp_assoc_rm_peer(asoc, peer); 31421da177e4SLinus Torvalds break; 31431da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 314442e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 314542e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 314642e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 314742e30bf3SVlad Yasevich * primary. 314842e30bf3SVlad Yasevich */ 314942e30bf3SVlad Yasevich if (af->is_any(&addr)) 315042e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 315142e30bf3SVlad Yasevich 3152dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31531da177e4SLinus Torvalds if (!peer) 3154945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31551da177e4SLinus Torvalds 31561da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31571da177e4SLinus Torvalds break; 31581da177e4SLinus Torvalds } 31591da177e4SLinus Torvalds 31601da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31611da177e4SLinus Torvalds } 31621da177e4SLinus Torvalds 31636f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31649de7922bSDaniel Borkmann bool sctp_verify_asconf(const struct sctp_association *asoc, 31659de7922bSDaniel Borkmann struct sctp_chunk *chunk, bool addr_param_needed, 31669de7922bSDaniel Borkmann struct sctp_paramhdr **errp) 31679de7922bSDaniel Borkmann { 31689de7922bSDaniel Borkmann sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) chunk->chunk_hdr; 31696f4c618dSWei Yongjun union sctp_params param; 31709de7922bSDaniel Borkmann bool addr_param_seen = false; 31716f4c618dSWei Yongjun 31729de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 31739de7922bSDaniel Borkmann size_t length = ntohs(param.p->length); 31749de7922bSDaniel Borkmann 31756f4c618dSWei Yongjun *errp = param.p; 31766f4c618dSWei Yongjun switch (param.p->type) { 31779de7922bSDaniel Borkmann case SCTP_PARAM_ERR_CAUSE: 31789de7922bSDaniel Borkmann break; 31799de7922bSDaniel Borkmann case SCTP_PARAM_IPV4_ADDRESS: 31809de7922bSDaniel Borkmann if (length != sizeof(sctp_ipv4addr_param_t)) 31819de7922bSDaniel Borkmann return false; 3182ce7b4cccSlucien /* ensure there is only one addr param and it's in the 3183ce7b4cccSlucien * beginning of addip_hdr params, or we reject it. 3184ce7b4cccSlucien */ 3185ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3186ce7b4cccSlucien return false; 31879de7922bSDaniel Borkmann addr_param_seen = true; 31889de7922bSDaniel Borkmann break; 31899de7922bSDaniel Borkmann case SCTP_PARAM_IPV6_ADDRESS: 31909de7922bSDaniel Borkmann if (length != sizeof(sctp_ipv6addr_param_t)) 31919de7922bSDaniel Borkmann return false; 3192ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3193ce7b4cccSlucien return false; 31949de7922bSDaniel Borkmann addr_param_seen = true; 31959de7922bSDaniel Borkmann break; 31966f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31976f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31986f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31999de7922bSDaniel Borkmann /* In ASCONF chunks, these need to be first. */ 32009de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 32019de7922bSDaniel Borkmann return false; 32029de7922bSDaniel Borkmann length = ntohs(param.addip->param_hdr.length); 32039de7922bSDaniel Borkmann if (length < sizeof(sctp_addip_param_t) + 32046f4c618dSWei Yongjun sizeof(sctp_paramhdr_t)) 32059de7922bSDaniel Borkmann return false; 32066f4c618dSWei Yongjun break; 32076f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 32086f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 32096f4c618dSWei Yongjun if (length != sizeof(sctp_addip_param_t)) 32109de7922bSDaniel Borkmann return false; 32116f4c618dSWei Yongjun break; 32126f4c618dSWei Yongjun default: 32139de7922bSDaniel Borkmann /* This is unkown to us, reject! */ 32149de7922bSDaniel Borkmann return false; 32159de7922bSDaniel Borkmann } 32166f4c618dSWei Yongjun } 32176f4c618dSWei Yongjun 32189de7922bSDaniel Borkmann /* Remaining sanity checks. */ 32199de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 32209de7922bSDaniel Borkmann return false; 32219de7922bSDaniel Borkmann if (!addr_param_needed && addr_param_seen) 32229de7922bSDaniel Borkmann return false; 32239de7922bSDaniel Borkmann if (param.v != chunk->chunk_end) 32249de7922bSDaniel Borkmann return false; 32256f4c618dSWei Yongjun 32269de7922bSDaniel Borkmann return true; 32276f4c618dSWei Yongjun } 32286f4c618dSWei Yongjun 32291da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 32301da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 32311da177e4SLinus Torvalds */ 32321da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 32331da177e4SLinus Torvalds struct sctp_chunk *asconf) 32341da177e4SLinus Torvalds { 32359de7922bSDaniel Borkmann sctp_addip_chunk_t *addip = (sctp_addip_chunk_t *) asconf->chunk_hdr; 32369de7922bSDaniel Borkmann bool all_param_pass = true; 32379de7922bSDaniel Borkmann union sctp_params param; 32381da177e4SLinus Torvalds sctp_addiphdr_t *hdr; 32391da177e4SLinus Torvalds union sctp_addr_param *addr_param; 32401da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 32411da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 3242dbc16db1SAl Viro __be16 err_code; 32431da177e4SLinus Torvalds int length = 0; 3244f3830cccSWei Yongjun int chunk_len; 32451da177e4SLinus Torvalds __u32 serial; 32461da177e4SLinus Torvalds 3247f3830cccSWei Yongjun chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t); 32481da177e4SLinus Torvalds hdr = (sctp_addiphdr_t *)asconf->skb->data; 32491da177e4SLinus Torvalds serial = ntohl(hdr->serial); 32501da177e4SLinus Torvalds 32511da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 32521da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 32531da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 32541da177e4SLinus Torvalds chunk_len -= length; 32551da177e4SLinus Torvalds 32561da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 32577aa1b54bSJoe Perches * asconf parameter. 32581da177e4SLinus Torvalds */ 32596a435732SShan Wei length = ntohs(addr_param->p.length); 3260ea110733SJoe Perches asconf_param = (void *)addr_param + length; 32611da177e4SLinus Torvalds chunk_len -= length; 32621da177e4SLinus Torvalds 32631da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 32641da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 32652cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 32667aa1b54bSJoe Perches * parameters. 32671da177e4SLinus Torvalds */ 32682cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 32691da177e4SLinus Torvalds if (!asconf_ack) 32701da177e4SLinus Torvalds goto done; 32711da177e4SLinus Torvalds 32721da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 32739de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 32749de7922bSDaniel Borkmann /* Skip preceeding address parameters. */ 32759de7922bSDaniel Borkmann if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 32769de7922bSDaniel Borkmann param.p->type == SCTP_PARAM_IPV6_ADDRESS) 32779de7922bSDaniel Borkmann continue; 32789de7922bSDaniel Borkmann 32791da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 32809de7922bSDaniel Borkmann param.addip); 32811da177e4SLinus Torvalds /* ADDIP 4.1 A7) 32821da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 32831da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 32841da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 32851da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 32861da177e4SLinus Torvalds * a specific success indication is present for the parameter. 32871da177e4SLinus Torvalds */ 32889de7922bSDaniel Borkmann if (err_code != SCTP_ERROR_NO_ERROR) 32899de7922bSDaniel Borkmann all_param_pass = false; 32901da177e4SLinus Torvalds if (!all_param_pass) 32919de7922bSDaniel Borkmann sctp_add_asconf_response(asconf_ack, param.addip->crr_id, 32929de7922bSDaniel Borkmann err_code, param.addip); 32931da177e4SLinus Torvalds 32941da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32951da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32961da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32971da177e4SLinus Torvalds * in the ASCONF. 32981da177e4SLinus Torvalds */ 32999de7922bSDaniel Borkmann if (err_code == SCTP_ERROR_RSRC_LOW) 33001da177e4SLinus Torvalds goto done; 33011da177e4SLinus Torvalds } 33021da177e4SLinus Torvalds done: 33031da177e4SLinus Torvalds asoc->peer.addip_serial++; 33041da177e4SLinus Torvalds 33051da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 33061da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 33071da177e4SLinus Torvalds */ 33081da177e4SLinus Torvalds if (asconf_ack) { 33091da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3310a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3311a08de64dSVlad Yasevich &asoc->asconf_ack_list); 33121da177e4SLinus Torvalds } 33131da177e4SLinus Torvalds 33141da177e4SLinus Torvalds return asconf_ack; 33151da177e4SLinus Torvalds } 33161da177e4SLinus Torvalds 33171da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3318425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 33191da177e4SLinus Torvalds sctp_addip_param_t *asconf_param) 33201da177e4SLinus Torvalds { 33211da177e4SLinus Torvalds struct sctp_af *af; 33221da177e4SLinus Torvalds union sctp_addr addr; 33231da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 33241da177e4SLinus Torvalds union sctp_addr_param *addr_param; 33251da177e4SLinus Torvalds struct sctp_transport *transport; 3326dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 33271da177e4SLinus Torvalds 3328ea110733SJoe Perches addr_param = (void *)asconf_param + sizeof(sctp_addip_param_t); 33291da177e4SLinus Torvalds 33301da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 33316a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3332dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 33331da177e4SLinus Torvalds 33341da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 33351da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3336559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3337559cf710SVlad Yasevich * held, so the list can not change. 3338559cf710SVlad Yasevich */ 33390ed90fb0SVlad Yasevich local_bh_disable(); 3340559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3341dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3342f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3343dc022a98SSridhar Samudrala } 33440ed90fb0SVlad Yasevich local_bh_enable(); 33453cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33463cd9749cSWei Yongjun transports) { 33473cd9749cSWei Yongjun dst_release(transport->dst); 3348c6ef006bSVlad Yasevich transport->dst = NULL; 33493cd9749cSWei Yongjun } 33501da177e4SLinus Torvalds break; 33511da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 33520ed90fb0SVlad Yasevich local_bh_disable(); 3353425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 33548a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 33558a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 33568a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 33578a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 33588a07eb0aSMichio Honda } 33590ed90fb0SVlad Yasevich local_bh_enable(); 33609dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33619dbc15f0SRobert P. J. Day transports) { 3362dc022a98SSridhar Samudrala dst_release(transport->dst); 3363c6ef006bSVlad Yasevich transport->dst = NULL; 33641da177e4SLinus Torvalds } 33651da177e4SLinus Torvalds break; 33661da177e4SLinus Torvalds default: 33671da177e4SLinus Torvalds break; 33681da177e4SLinus Torvalds } 33691da177e4SLinus Torvalds } 33701da177e4SLinus Torvalds 33711da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 33721da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 33731da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 33741da177e4SLinus Torvalds * ADDIP 4.1 33751da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 33761da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 33771da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 33781da177e4SLinus Torvalds * specific success indication is present for the parameter. 33791da177e4SLinus Torvalds */ 3380dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 33811da177e4SLinus Torvalds sctp_addip_param_t *asconf_param, 33821da177e4SLinus Torvalds int no_err) 33831da177e4SLinus Torvalds { 33841da177e4SLinus Torvalds sctp_addip_param_t *asconf_ack_param; 33851da177e4SLinus Torvalds sctp_errhdr_t *err_param; 33861da177e4SLinus Torvalds int length; 3387f3830cccSWei Yongjun int asconf_ack_len; 3388dbc16db1SAl Viro __be16 err_code; 33891da177e4SLinus Torvalds 33901da177e4SLinus Torvalds if (no_err) 33911da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33921da177e4SLinus Torvalds else 33931da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33941da177e4SLinus Torvalds 3395f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3396f3830cccSWei Yongjun sizeof(sctp_chunkhdr_t); 3397f3830cccSWei Yongjun 33981da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33991da177e4SLinus Torvalds * the first asconf_ack parameter. 34001da177e4SLinus Torvalds */ 34011da177e4SLinus Torvalds length = sizeof(sctp_addiphdr_t); 34021da177e4SLinus Torvalds asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data + 34031da177e4SLinus Torvalds length); 34041da177e4SLinus Torvalds asconf_ack_len -= length; 34051da177e4SLinus Torvalds 34061da177e4SLinus Torvalds while (asconf_ack_len > 0) { 34071da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 34081da177e4SLinus Torvalds switch (asconf_ack_param->param_hdr.type) { 34091da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 34101da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 34111da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 34121da177e4SLinus Torvalds length = sizeof(sctp_addip_param_t); 3413ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 34141da177e4SLinus Torvalds asconf_ack_len -= length; 34151da177e4SLinus Torvalds if (asconf_ack_len > 0) 34161da177e4SLinus Torvalds return err_param->cause; 34171da177e4SLinus Torvalds else 34181da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34191da177e4SLinus Torvalds break; 34201da177e4SLinus Torvalds default: 34211da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 34221da177e4SLinus Torvalds } 34231da177e4SLinus Torvalds } 34241da177e4SLinus Torvalds 34251da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3426ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 34271da177e4SLinus Torvalds asconf_ack_len -= length; 34281da177e4SLinus Torvalds } 34291da177e4SLinus Torvalds 34301da177e4SLinus Torvalds return err_code; 34311da177e4SLinus Torvalds } 34321da177e4SLinus Torvalds 34331da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 34341da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 34351da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 34361da177e4SLinus Torvalds { 34371da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 34381da177e4SLinus Torvalds union sctp_addr_param *addr_param; 34391da177e4SLinus Torvalds sctp_addip_param_t *asconf_param; 34401da177e4SLinus Torvalds int length = 0; 34411da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 34421da177e4SLinus Torvalds int all_param_pass = 0; 34431da177e4SLinus Torvalds int no_err = 1; 34441da177e4SLinus Torvalds int retval = 0; 3445dbc16db1SAl Viro __be16 err_code = SCTP_ERROR_NO_ERROR; 34461da177e4SLinus Torvalds 34471da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 34481da177e4SLinus Torvalds * a pointer to address parameter. 34491da177e4SLinus Torvalds */ 34501da177e4SLinus Torvalds length = sizeof(sctp_addip_chunk_t); 34511da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 34521da177e4SLinus Torvalds asconf_len -= length; 34531da177e4SLinus Torvalds 34541da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 34557aa1b54bSJoe Perches * pointer to the first asconf parameter. 34561da177e4SLinus Torvalds */ 34576a435732SShan Wei length = ntohs(addr_param->p.length); 3458ea110733SJoe Perches asconf_param = (void *)addr_param + length; 34591da177e4SLinus Torvalds asconf_len -= length; 34601da177e4SLinus Torvalds 34611da177e4SLinus Torvalds /* ADDIP 4.1 34621da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 34631da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 34641da177e4SLinus Torvalds * successful. 34651da177e4SLinus Torvalds */ 34661da177e4SLinus Torvalds if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t)) 34671da177e4SLinus Torvalds all_param_pass = 1; 34681da177e4SLinus Torvalds 34691da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 34701da177e4SLinus Torvalds while (asconf_len > 0) { 34711da177e4SLinus Torvalds if (all_param_pass) 34721da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34731da177e4SLinus Torvalds else { 34741da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 34751da177e4SLinus Torvalds asconf_param, 34761da177e4SLinus Torvalds no_err); 34771da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 34781da177e4SLinus Torvalds no_err = 0; 34791da177e4SLinus Torvalds } 34801da177e4SLinus Torvalds 34811da177e4SLinus Torvalds switch (err_code) { 34821da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3483425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 34841da177e4SLinus Torvalds break; 34851da177e4SLinus Torvalds 34861da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 34871da177e4SLinus Torvalds retval = 1; 34881da177e4SLinus Torvalds break; 34891da177e4SLinus Torvalds 3490a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34911da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34921da177e4SLinus Torvalds * future. 34931da177e4SLinus Torvalds */ 34941da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34951da177e4SLinus Torvalds asconf_param->param_hdr.type; 34961da177e4SLinus Torvalds break; 34971da177e4SLinus Torvalds 34981da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34991da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 35001da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 35011da177e4SLinus Torvalds default: 35021da177e4SLinus Torvalds break; 35031da177e4SLinus Torvalds } 35041da177e4SLinus Torvalds 35051da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 35061da177e4SLinus Torvalds * one. 35071da177e4SLinus Torvalds */ 35081da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3509ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 35101da177e4SLinus Torvalds asconf_len -= length; 35111da177e4SLinus Torvalds } 35121da177e4SLinus Torvalds 3513ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 35148a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3515ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3516ddc4bbeeSMichio Honda } 35178a07eb0aSMichio Honda 35181da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 35195f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 35201da177e4SLinus Torvalds sctp_chunk_free(asconf); 35211da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 35221da177e4SLinus Torvalds 35231da177e4SLinus Torvalds return retval; 35241da177e4SLinus Torvalds } 35251da177e4SLinus Torvalds 35261da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 35271da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 35281da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 35291da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 35301da177e4SLinus Torvalds { 35311da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 35321da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 35331da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 35341da177e4SLinus Torvalds size_t hint; 35351da177e4SLinus Torvalds int i; 35361da177e4SLinus Torvalds 35371da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 35381da177e4SLinus Torvalds 3539cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); 35401da177e4SLinus Torvalds 35411da177e4SLinus Torvalds if (!retval) 35421da177e4SLinus Torvalds return NULL; 35431da177e4SLinus Torvalds 35441da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35451da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 35461da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35471da177e4SLinus Torvalds 35481da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 35491da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 35501da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 35511da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 35521da177e4SLinus Torvalds } 35531da177e4SLinus Torvalds 35541da177e4SLinus Torvalds return retval; 35551da177e4SLinus Torvalds } 3556