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); 72f48ef4c7SXin Long static struct sctp_cookie_param *sctp_pack_cookie( 73f48ef4c7SXin Long const struct sctp_endpoint *ep, 741da177e4SLinus Torvalds const struct sctp_association *asoc, 751da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 761da177e4SLinus Torvalds int *cookie_len, 771da177e4SLinus Torvalds const __u8 *raw_addrs, int addrs_len); 781da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 791da177e4SLinus Torvalds union sctp_params param, 801da177e4SLinus Torvalds const union sctp_addr *peer_addr, 81dd0fc66fSAl Viro gfp_t gfp); 828ee4be37SVlad Yasevich static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 838ee4be37SVlad Yasevich const void *data); 846daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len, 856daaf0deSstephen hemminger const void *data); 861da177e4SLinus Torvalds 87072017b4SVlad Yasevich /* Control chunk destructor */ 88072017b4SVlad Yasevich static void sctp_control_release_owner(struct sk_buff *skb) 89072017b4SVlad Yasevich { 90072017b4SVlad Yasevich /*TODO: do memory release */ 91072017b4SVlad Yasevich } 92072017b4SVlad Yasevich 93072017b4SVlad Yasevich static void sctp_control_set_owner_w(struct sctp_chunk *chunk) 94072017b4SVlad Yasevich { 95072017b4SVlad Yasevich struct sctp_association *asoc = chunk->asoc; 96072017b4SVlad Yasevich struct sk_buff *skb = chunk->skb; 97072017b4SVlad Yasevich 98072017b4SVlad Yasevich /* TODO: properly account for control chunks. 99072017b4SVlad Yasevich * To do it right we'll need: 100072017b4SVlad Yasevich * 1) endpoint if association isn't known. 101072017b4SVlad Yasevich * 2) proper memory accounting. 102072017b4SVlad Yasevich * 103072017b4SVlad Yasevich * For now don't do anything for now. 104072017b4SVlad Yasevich */ 105072017b4SVlad Yasevich skb->sk = asoc ? asoc->base.sk : NULL; 106072017b4SVlad Yasevich skb->destructor = sctp_control_release_owner; 107072017b4SVlad Yasevich } 108072017b4SVlad Yasevich 1091da177e4SLinus Torvalds /* What was the inbound interface for this chunk? */ 1101da177e4SLinus Torvalds int sctp_chunk_iif(const struct sctp_chunk *chunk) 1111da177e4SLinus Torvalds { 112e7487c86SMarcelo Ricardo Leitner struct sk_buff *skb = chunk->skb; 1131da177e4SLinus Torvalds 114e7487c86SMarcelo Ricardo Leitner return SCTP_INPUT_CB(skb)->af->skb_iif(skb); 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 1181da177e4SLinus Torvalds * 1191da177e4SLinus Torvalds * Note 2: The ECN capable field is reserved for future use of 1201da177e4SLinus Torvalds * Explicit Congestion Notification. 1211da177e4SLinus Torvalds */ 1221da177e4SLinus Torvalds static const struct sctp_paramhdr ecap_param = { 1231da177e4SLinus Torvalds SCTP_PARAM_ECN_CAPABLE, 12409640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1251da177e4SLinus Torvalds }; 1261da177e4SLinus Torvalds static const struct sctp_paramhdr prsctp_param = { 1271da177e4SLinus Torvalds SCTP_PARAM_FWD_TSN_SUPPORT, 12809640e63SHarvey Harrison cpu_to_be16(sizeof(struct sctp_paramhdr)), 1291da177e4SLinus Torvalds }; 1301da177e4SLinus Torvalds 1315fa782c2SNeil Horman /* A helper to initialize an op error inside a 1321da177e4SLinus Torvalds * provided chunk, as most cause codes will be embedded inside an 1331da177e4SLinus Torvalds * abort chunk. 1341da177e4SLinus Torvalds */ 1355bf2db03SAl Viro void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code, 13600f1c2dfSWei Yongjun size_t paylen) 1371da177e4SLinus Torvalds { 138d8238d9dSXin Long struct sctp_errhdr err; 1391da177e4SLinus Torvalds __u16 len; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds /* Cause code constants are now defined in network order. */ 1421da177e4SLinus Torvalds err.cause = cause_code; 143d8238d9dSXin Long len = sizeof(err) + paylen; 1441da177e4SLinus Torvalds err.length = htons(len); 145d8238d9dSXin Long chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(err), &err); 1461da177e4SLinus Torvalds } 1471da177e4SLinus Torvalds 1485fa782c2SNeil Horman /* A helper to initialize an op error inside a 1495fa782c2SNeil Horman * provided chunk, as most cause codes will be embedded inside an 1505fa782c2SNeil Horman * abort chunk. Differs from sctp_init_cause in that it won't oops 1515fa782c2SNeil Horman * if there isn't enough space in the op error chunk 1525fa782c2SNeil Horman */ 153db28aafaSIoan Orghici static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, 1545fa782c2SNeil Horman size_t paylen) 1555fa782c2SNeil Horman { 156d8238d9dSXin Long struct sctp_errhdr err; 1575fa782c2SNeil Horman __u16 len; 1585fa782c2SNeil Horman 1595fa782c2SNeil Horman /* Cause code constants are now defined in network order. */ 1605fa782c2SNeil Horman err.cause = cause_code; 161d8238d9dSXin Long len = sizeof(err) + paylen; 1625fa782c2SNeil Horman err.length = htons(len); 1635fa782c2SNeil Horman 1642e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) < len) 1655fa782c2SNeil Horman return -ENOSPC; 166d8238d9dSXin Long 167d8238d9dSXin Long chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, sizeof(err), &err); 168d8238d9dSXin Long 1695fa782c2SNeil Horman return 0; 1705fa782c2SNeil Horman } 1711da177e4SLinus Torvalds /* 3.3.2 Initiation (INIT) (1) 1721da177e4SLinus Torvalds * 1731da177e4SLinus Torvalds * This chunk is used to initiate a SCTP association between two 1741da177e4SLinus Torvalds * endpoints. The format of the INIT chunk is shown below: 1751da177e4SLinus Torvalds * 1761da177e4SLinus Torvalds * 0 1 2 3 1771da177e4SLinus 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 1781da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1791da177e4SLinus Torvalds * | Type = 1 | Chunk Flags | Chunk Length | 1801da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1811da177e4SLinus Torvalds * | Initiate Tag | 1821da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1831da177e4SLinus Torvalds * | Advertised Receiver Window Credit (a_rwnd) | 1841da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1851da177e4SLinus Torvalds * | Number of Outbound Streams | Number of Inbound Streams | 1861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1871da177e4SLinus Torvalds * | Initial TSN | 1881da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1891da177e4SLinus Torvalds * \ \ 1901da177e4SLinus Torvalds * / Optional/Variable-Length Parameters / 1911da177e4SLinus Torvalds * \ \ 1921da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1931da177e4SLinus Torvalds * 1941da177e4SLinus Torvalds * 1951da177e4SLinus Torvalds * The INIT chunk contains the following parameters. Unless otherwise 1961da177e4SLinus Torvalds * noted, each parameter MUST only be included once in the INIT chunk. 1971da177e4SLinus Torvalds * 1981da177e4SLinus Torvalds * Fixed Parameters Status 1991da177e4SLinus Torvalds * ---------------------------------------------- 2001da177e4SLinus Torvalds * Initiate Tag Mandatory 2011da177e4SLinus Torvalds * Advertised Receiver Window Credit Mandatory 2021da177e4SLinus Torvalds * Number of Outbound Streams Mandatory 2031da177e4SLinus Torvalds * Number of Inbound Streams Mandatory 2041da177e4SLinus Torvalds * Initial TSN Mandatory 2051da177e4SLinus Torvalds * 2061da177e4SLinus Torvalds * Variable Parameters Status Type Value 2071da177e4SLinus Torvalds * ------------------------------------------------------------- 2081da177e4SLinus Torvalds * IPv4 Address (Note 1) Optional 5 2091da177e4SLinus Torvalds * IPv6 Address (Note 1) Optional 6 2101da177e4SLinus Torvalds * Cookie Preservative Optional 9 2111da177e4SLinus Torvalds * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000) 2121da177e4SLinus Torvalds * Host Name Address (Note 3) Optional 11 2131da177e4SLinus Torvalds * Supported Address Types (Note 4) Optional 12 2141da177e4SLinus Torvalds */ 2151da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc, 2161da177e4SLinus Torvalds const struct sctp_bind_addr *bp, 217dd0fc66fSAl Viro gfp_t gfp, int vparam_len) 2181da177e4SLinus Torvalds { 219e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 220327c0dabSXin Long struct sctp_supported_ext_param ext_param; 221327c0dabSXin Long struct sctp_adaptation_ind_param aiparam; 222327c0dabSXin Long struct sctp_paramhdr *auth_chunks = NULL; 223327c0dabSXin Long struct sctp_paramhdr *auth_hmacs = NULL; 224327c0dabSXin Long struct sctp_supported_addrs_param sat; 225b14878ccSVlad Yasevich struct sctp_endpoint *ep = asoc->ep; 2261da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 2271da177e4SLinus Torvalds int num_types, addrs_len = 0; 228327c0dabSXin Long struct sctp_inithdr init; 229327c0dabSXin Long union sctp_params addrs; 2301da177e4SLinus Torvalds struct sctp_sock *sp; 23110b3bf54SXin Long __u8 extensions[4]; 232327c0dabSXin Long size_t chunksize; 233327c0dabSXin Long __be16 types[2]; 234327c0dabSXin Long int num_ext = 0; 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 2371da177e4SLinus Torvalds * 2381da177e4SLinus Torvalds * Note 1: The INIT chunks can contain multiple addresses that 2391da177e4SLinus Torvalds * can be IPv4 and/or IPv6 in any combination. 2401da177e4SLinus Torvalds */ 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds /* Convert the provided bind address list to raw format. */ 2431da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp); 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds init.init_tag = htonl(asoc->c.my_vtag); 2461da177e4SLinus Torvalds init.a_rwnd = htonl(asoc->rwnd); 2471da177e4SLinus Torvalds init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 2481da177e4SLinus Torvalds init.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 2491da177e4SLinus Torvalds init.initial_tsn = htonl(asoc->c.initial_tsn); 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds /* How many address types are needed? */ 2521da177e4SLinus Torvalds sp = sctp_sk(asoc->base.sk); 2531da177e4SLinus Torvalds num_types = sp->pf->supported_addrs(sp, types); 2541da177e4SLinus Torvalds 255a8170c35SWei Yongjun chunksize = sizeof(init) + addrs_len; 256e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(SCTP_SAT_LEN(num_types)); 2571da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 2588ee4be37SVlad Yasevich 25928aa4c26SXin Long if (asoc->prsctp_enable) 260036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 261036b579bSVlad Yasevich 262131a47e3SVlad Yasevich /* ADDIP: Section 4.2.7: 263131a47e3SVlad Yasevich * An implementation supporting this extension [ADDIP] MUST list 264131a47e3SVlad Yasevich * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and 265131a47e3SVlad Yasevich * INIT-ACK parameters. 266131a47e3SVlad Yasevich */ 267e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) { 268131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 269131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 270131a47e3SVlad Yasevich num_ext += 2; 271131a47e3SVlad Yasevich } 272131a47e3SVlad Yasevich 273c28445c3SXin Long if (asoc->reconf_enable) { 274c28445c3SXin Long extensions[num_ext] = SCTP_CID_RECONF; 275c28445c3SXin Long num_ext += 1; 276c28445c3SXin Long } 277c28445c3SXin Long 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 */ 2893c918704SXin Long auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; 290730fc3d0SVlad Yasevich if (auth_hmacs->length) 291e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); 292730fc3d0SVlad Yasevich else 293730fc3d0SVlad Yasevich auth_hmacs = NULL; 294730fc3d0SVlad Yasevich 295730fc3d0SVlad Yasevich /* Add CHUNKS parameter length */ 2963c918704SXin Long auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; 297730fc3d0SVlad Yasevich if (auth_chunks->length) 298e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(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) 30815328d9fSXin Long chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); 309131a47e3SVlad Yasevich 3101da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3111da177e4SLinus Torvalds * 3121da177e4SLinus Torvalds * Note 3: An INIT chunk MUST NOT contain more than one Host 3131da177e4SLinus Torvalds * Name address parameter. Moreover, the sender of the INIT 3141da177e4SLinus Torvalds * MUST NOT combine any other address types with the Host Name 3151da177e4SLinus Torvalds * address in the INIT. The receiver of INIT MUST ignore any 3161da177e4SLinus Torvalds * other address types if the Host Name address parameter is 3171da177e4SLinus Torvalds * present in the received INIT chunk. 3181da177e4SLinus Torvalds * 3191da177e4SLinus Torvalds * PLEASE DO NOT FIXME [This version does not support Host Name.] 3201da177e4SLinus Torvalds */ 3211da177e4SLinus Torvalds 322cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT, 0, chunksize, gfp); 3231da177e4SLinus Torvalds if (!retval) 3241da177e4SLinus Torvalds goto nodata; 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds retval->subh.init_hdr = 3271da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(init), &init); 3281da177e4SLinus Torvalds retval->param_hdr.v = 3291da177e4SLinus Torvalds sctp_addto_chunk(retval, addrs_len, addrs.v); 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds /* RFC 2960 3.3.2 Initiation (INIT) (1) 3321da177e4SLinus Torvalds * 3331da177e4SLinus Torvalds * Note 4: This parameter, when present, specifies all the 3341da177e4SLinus Torvalds * address types the sending endpoint can support. The absence 3351da177e4SLinus Torvalds * of this parameter indicates that the sending endpoint can 3361da177e4SLinus Torvalds * support any address type. 3371da177e4SLinus Torvalds */ 3381da177e4SLinus Torvalds sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES; 3391da177e4SLinus Torvalds sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types)); 3401da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sat), &sat); 3411da177e4SLinus Torvalds sctp_addto_chunk(retval, num_types * sizeof(__u16), &types); 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 344131a47e3SVlad Yasevich 3457aa1b54bSJoe Perches /* Add the supported extensions parameter. Be nice and add this 346131a47e3SVlad Yasevich * fist before addiding the parameters for the extensions themselves 347131a47e3SVlad Yasevich */ 348131a47e3SVlad Yasevich if (num_ext) { 349131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 35015328d9fSXin Long ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); 35115328d9fSXin Long sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); 3528ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 353131a47e3SVlad Yasevich } 354131a47e3SVlad Yasevich 35528aa4c26SXin Long if (asoc->prsctp_enable) 3561da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 357131a47e3SVlad Yasevich 3586fc791eeSmalc if (sp->adaptation_ind) { 3590f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 3601da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 3610f3fffd8SIvan Skytte Jorgensen aiparam.adaptation_ind = htonl(sp->adaptation_ind); 3621da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 3636fc791eeSmalc } 364131a47e3SVlad Yasevich 365730fc3d0SVlad Yasevich /* Add SCTP-AUTH chunks to the parameter list */ 366b14878ccSVlad Yasevich if (ep->auth_enable) { 367730fc3d0SVlad Yasevich sctp_addto_chunk(retval, sizeof(asoc->c.auth_random), 368730fc3d0SVlad Yasevich asoc->c.auth_random); 369730fc3d0SVlad Yasevich if (auth_hmacs) 370730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 371730fc3d0SVlad Yasevich auth_hmacs); 372730fc3d0SVlad Yasevich if (auth_chunks) 373730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 374730fc3d0SVlad Yasevich auth_chunks); 375730fc3d0SVlad Yasevich } 3761da177e4SLinus Torvalds nodata: 3771da177e4SLinus Torvalds kfree(addrs.v); 3781da177e4SLinus Torvalds return retval; 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc, 3821da177e4SLinus Torvalds const struct sctp_chunk *chunk, 383dd0fc66fSAl Viro gfp_t gfp, int unkparam_len) 3841da177e4SLinus Torvalds { 385327c0dabSXin Long struct sctp_supported_ext_param ext_param; 386327c0dabSXin Long struct sctp_adaptation_ind_param aiparam; 387327c0dabSXin Long struct sctp_paramhdr *auth_chunks = NULL; 388327c0dabSXin Long struct sctp_paramhdr *auth_random = NULL; 389327c0dabSXin Long struct sctp_paramhdr *auth_hmacs = NULL; 390327c0dabSXin Long struct sctp_chunk *retval = NULL; 391327c0dabSXin Long struct sctp_cookie_param *cookie; 3924ae70c08SXin Long struct sctp_inithdr initack; 3931da177e4SLinus Torvalds union sctp_params addrs; 3946fc791eeSmalc struct sctp_sock *sp; 39510b3bf54SXin Long __u8 extensions[4]; 396327c0dabSXin Long size_t chunksize; 397327c0dabSXin Long int num_ext = 0; 398327c0dabSXin Long int cookie_len; 399327c0dabSXin Long int addrs_len; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds /* Note: there may be no addresses to embed. */ 4021da177e4SLinus Torvalds addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp); 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds initack.init_tag = htonl(asoc->c.my_vtag); 4051da177e4SLinus Torvalds initack.a_rwnd = htonl(asoc->rwnd); 4061da177e4SLinus Torvalds initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams); 4071da177e4SLinus Torvalds initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams); 4081da177e4SLinus Torvalds initack.initial_tsn = htonl(asoc->c.initial_tsn); 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds /* FIXME: We really ought to build the cookie right 4111da177e4SLinus Torvalds * into the packet instead of allocating more fresh memory. 4121da177e4SLinus Torvalds */ 4131da177e4SLinus Torvalds cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len, 4141da177e4SLinus Torvalds addrs.v, addrs_len); 4151da177e4SLinus Torvalds if (!cookie) 4161da177e4SLinus Torvalds goto nomem_cookie; 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds /* Calculate the total size of allocation, include the reserved 4191da177e4SLinus Torvalds * space for reporting unknown parameters if it is specified. 4201da177e4SLinus Torvalds */ 4216fc791eeSmalc sp = sctp_sk(asoc->base.sk); 4221da177e4SLinus Torvalds chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len; 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds /* Tell peer that we'll do ECN only if peer advertised such cap. */ 4251da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4261da177e4SLinus Torvalds chunksize += sizeof(ecap_param); 4271da177e4SLinus Torvalds 4285ffad5acSWei Yongjun if (asoc->peer.prsctp_capable) 429036b579bSVlad Yasevich chunksize += sizeof(prsctp_param); 430036b579bSVlad Yasevich 4315ffad5acSWei Yongjun if (asoc->peer.asconf_capable) { 432131a47e3SVlad Yasevich extensions[num_ext] = SCTP_CID_ASCONF; 433131a47e3SVlad Yasevich extensions[num_ext+1] = SCTP_CID_ASCONF_ACK; 434131a47e3SVlad Yasevich num_ext += 2; 435131a47e3SVlad Yasevich } 436131a47e3SVlad Yasevich 437c28445c3SXin Long if (asoc->peer.reconf_capable) { 438c28445c3SXin Long extensions[num_ext] = SCTP_CID_RECONF; 439c28445c3SXin Long num_ext += 1; 440c28445c3SXin Long } 441c28445c3SXin Long 4426fc791eeSmalc if (sp->adaptation_ind) 4431da177e4SLinus Torvalds chunksize += sizeof(aiparam); 4441da177e4SLinus Torvalds 445730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 4463c918704SXin Long auth_random = (struct sctp_paramhdr *)asoc->c.auth_random; 447730fc3d0SVlad Yasevich chunksize += ntohs(auth_random->length); 448730fc3d0SVlad Yasevich 4493c918704SXin Long auth_hmacs = (struct sctp_paramhdr *)asoc->c.auth_hmacs; 450730fc3d0SVlad Yasevich if (auth_hmacs->length) 451e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(ntohs(auth_hmacs->length)); 452730fc3d0SVlad Yasevich else 453730fc3d0SVlad Yasevich auth_hmacs = NULL; 454730fc3d0SVlad Yasevich 4553c918704SXin Long auth_chunks = (struct sctp_paramhdr *)asoc->c.auth_chunks; 456730fc3d0SVlad Yasevich if (auth_chunks->length) 457e2f036a9SMarcelo Ricardo Leitner chunksize += SCTP_PAD4(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) 46615328d9fSXin Long chunksize += SCTP_PAD4(sizeof(ext_param) + num_ext); 4678ee4be37SVlad Yasevich 4681da177e4SLinus Torvalds /* Now allocate and fill out the chunk. */ 469cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_INIT_ACK, 0, chunksize, gfp); 4701da177e4SLinus Torvalds if (!retval) 4711da177e4SLinus Torvalds goto nomem_chunk; 4721da177e4SLinus Torvalds 473b99a4d53SDan Carpenter /* RFC 2960 6.4 Multi-homed SCTP Endpoints 474b99a4d53SDan Carpenter * 475b99a4d53SDan Carpenter * An endpoint SHOULD transmit reply chunks (e.g., SACK, 476b99a4d53SDan Carpenter * HEARTBEAT ACK, * etc.) to the same destination transport 477b99a4d53SDan Carpenter * address from which it received the DATA or control chunk 478b99a4d53SDan Carpenter * to which it is replying. 479b99a4d53SDan Carpenter * 480b99a4d53SDan Carpenter * [INIT ACK back to where the INIT came from.] 4811da177e4SLinus Torvalds */ 4821da177e4SLinus Torvalds retval->transport = chunk->transport; 483b99a4d53SDan Carpenter 4841da177e4SLinus Torvalds retval->subh.init_hdr = 4851da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(initack), &initack); 4861da177e4SLinus Torvalds retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v); 4871da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 4881da177e4SLinus Torvalds if (asoc->peer.ecn_capable) 4891da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param); 490131a47e3SVlad Yasevich if (num_ext) { 491131a47e3SVlad Yasevich ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT; 49215328d9fSXin Long ext_param.param_hdr.length = htons(sizeof(ext_param) + num_ext); 49315328d9fSXin Long sctp_addto_chunk(retval, sizeof(ext_param), &ext_param); 4948ee4be37SVlad Yasevich sctp_addto_param(retval, num_ext, extensions); 495131a47e3SVlad Yasevich } 4961da177e4SLinus Torvalds if (asoc->peer.prsctp_capable) 4971da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param); 4981da177e4SLinus Torvalds 4996fc791eeSmalc if (sp->adaptation_ind) { 5000f3fffd8SIvan Skytte Jorgensen aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND; 5011da177e4SLinus Torvalds aiparam.param_hdr.length = htons(sizeof(aiparam)); 5026fc791eeSmalc aiparam.adaptation_ind = htonl(sp->adaptation_ind); 5031da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(aiparam), &aiparam); 5046fc791eeSmalc } 5051da177e4SLinus Torvalds 506730fc3d0SVlad Yasevich if (asoc->peer.auth_capable) { 507730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_random->length), 508730fc3d0SVlad Yasevich auth_random); 509730fc3d0SVlad Yasevich if (auth_hmacs) 510730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_hmacs->length), 511730fc3d0SVlad Yasevich auth_hmacs); 512730fc3d0SVlad Yasevich if (auth_chunks) 513730fc3d0SVlad Yasevich sctp_addto_chunk(retval, ntohs(auth_chunks->length), 514730fc3d0SVlad Yasevich auth_chunks); 515730fc3d0SVlad Yasevich } 516730fc3d0SVlad Yasevich 5171da177e4SLinus Torvalds /* We need to remove the const qualifier at this point. */ 5181da177e4SLinus Torvalds retval->asoc = (struct sctp_association *) asoc; 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds nomem_chunk: 5211da177e4SLinus Torvalds kfree(cookie); 5221da177e4SLinus Torvalds nomem_cookie: 5231da177e4SLinus Torvalds kfree(addrs.v); 5241da177e4SLinus Torvalds return retval; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds /* 3.3.11 Cookie Echo (COOKIE ECHO) (10): 5281da177e4SLinus Torvalds * 5291da177e4SLinus Torvalds * This chunk is used only during the initialization of an association. 5301da177e4SLinus Torvalds * It is sent by the initiator of an association to its peer to complete 5311da177e4SLinus Torvalds * the initialization process. This chunk MUST precede any DATA chunk 5321da177e4SLinus Torvalds * sent within the association, but MAY be bundled with one or more DATA 5331da177e4SLinus Torvalds * chunks in the same packet. 5341da177e4SLinus Torvalds * 5351da177e4SLinus Torvalds * 0 1 2 3 5361da177e4SLinus 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 5371da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5381da177e4SLinus Torvalds * | Type = 10 |Chunk Flags | Length | 5391da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5401da177e4SLinus Torvalds * / Cookie / 5411da177e4SLinus Torvalds * \ \ 5421da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 5431da177e4SLinus Torvalds * 5441da177e4SLinus Torvalds * Chunk Flags: 8 bit 5451da177e4SLinus Torvalds * 5461da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 5471da177e4SLinus Torvalds * 5481da177e4SLinus Torvalds * Length: 16 bits (unsigned integer) 5491da177e4SLinus Torvalds * 5501da177e4SLinus Torvalds * Set to the size of the chunk in bytes, including the 4 bytes of 5511da177e4SLinus Torvalds * the chunk header and the size of the Cookie. 5521da177e4SLinus Torvalds * 5531da177e4SLinus Torvalds * Cookie: variable size 5541da177e4SLinus Torvalds * 5551da177e4SLinus Torvalds * This field must contain the exact cookie received in the 5561da177e4SLinus Torvalds * State Cookie parameter from the previous INIT ACK. 5571da177e4SLinus Torvalds * 5581da177e4SLinus Torvalds * An implementation SHOULD make the cookie as small as possible 5591da177e4SLinus Torvalds * to insure interoperability. 5601da177e4SLinus Torvalds */ 5611da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc, 5621da177e4SLinus Torvalds const struct sctp_chunk *chunk) 5631da177e4SLinus Torvalds { 5641da177e4SLinus Torvalds struct sctp_chunk *retval; 5651da177e4SLinus Torvalds int cookie_len; 566327c0dabSXin Long void *cookie; 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds cookie = asoc->peer.cookie; 5691da177e4SLinus Torvalds cookie_len = asoc->peer.cookie_len; 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds /* Build a cookie echo chunk. */ 572cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ECHO, 0, 573cea8768fSMarcelo Ricardo Leitner cookie_len, GFP_ATOMIC); 5741da177e4SLinus Torvalds if (!retval) 5751da177e4SLinus Torvalds goto nodata; 5761da177e4SLinus Torvalds retval->subh.cookie_hdr = 5771da177e4SLinus Torvalds sctp_addto_chunk(retval, cookie_len, cookie); 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 5801da177e4SLinus Torvalds * 5811da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 5821da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 5831da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 5841da177e4SLinus Torvalds * to which it is replying. 5851da177e4SLinus Torvalds * 5861da177e4SLinus Torvalds * [COOKIE ECHO back to where the INIT ACK came from.] 5871da177e4SLinus Torvalds */ 5881da177e4SLinus Torvalds if (chunk) 5891da177e4SLinus Torvalds retval->transport = chunk->transport; 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds nodata: 5921da177e4SLinus Torvalds return retval; 5931da177e4SLinus Torvalds } 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11): 5961da177e4SLinus Torvalds * 5971da177e4SLinus Torvalds * This chunk is used only during the initialization of an 5981da177e4SLinus Torvalds * association. It is used to acknowledge the receipt of a COOKIE 5991da177e4SLinus Torvalds * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent 6001da177e4SLinus Torvalds * within the association, but MAY be bundled with one or more DATA 6011da177e4SLinus Torvalds * chunks or SACK chunk in the same SCTP packet. 6021da177e4SLinus Torvalds * 6031da177e4SLinus Torvalds * 0 1 2 3 6041da177e4SLinus 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 6051da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6061da177e4SLinus Torvalds * | Type = 11 |Chunk Flags | Length = 4 | 6071da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6081da177e4SLinus Torvalds * 6091da177e4SLinus Torvalds * Chunk Flags: 8 bits 6101da177e4SLinus Torvalds * 6111da177e4SLinus Torvalds * Set to zero on transmit and ignored on receipt. 6121da177e4SLinus Torvalds */ 6131da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc, 6141da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6151da177e4SLinus Torvalds { 6161da177e4SLinus Torvalds struct sctp_chunk *retval; 6171da177e4SLinus Torvalds 618cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_COOKIE_ACK, 0, 0, GFP_ATOMIC); 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6211da177e4SLinus Torvalds * 6221da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6231da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6241da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6251da177e4SLinus Torvalds * to which it is replying. 6261da177e4SLinus Torvalds * 6271da177e4SLinus Torvalds * [COOKIE ACK back to where the COOKIE ECHO came from.] 6281da177e4SLinus Torvalds */ 6291da177e4SLinus Torvalds if (retval && chunk) 6301da177e4SLinus Torvalds retval->transport = chunk->transport; 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds return retval; 6331da177e4SLinus Torvalds } 6341da177e4SLinus Torvalds 6351da177e4SLinus Torvalds /* 6361da177e4SLinus Torvalds * Appendix A: Explicit Congestion Notification: 6371da177e4SLinus Torvalds * CWR: 6381da177e4SLinus Torvalds * 6391da177e4SLinus Torvalds * RFC 2481 details a specific bit for a sender to send in the header of 6401da177e4SLinus Torvalds * its next outbound TCP segment to indicate to its peer that it has 6411da177e4SLinus Torvalds * reduced its congestion window. This is termed the CWR bit. For 6421da177e4SLinus Torvalds * SCTP the same indication is made by including the CWR chunk. 6431da177e4SLinus Torvalds * This chunk contains one data element, i.e. the TSN number that 6441da177e4SLinus Torvalds * was sent in the ECNE chunk. This element represents the lowest 6451da177e4SLinus Torvalds * TSN number in the datagram that was originally marked with the 6461da177e4SLinus Torvalds * CE bit. 6471da177e4SLinus Torvalds * 6481da177e4SLinus Torvalds * 0 1 2 3 6491da177e4SLinus 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 6501da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6511da177e4SLinus Torvalds * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 | 6521da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6531da177e4SLinus Torvalds * | Lowest TSN Number | 6541da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6551da177e4SLinus Torvalds * 6561da177e4SLinus Torvalds * Note: The CWR is considered a Control chunk. 6571da177e4SLinus Torvalds */ 6581da177e4SLinus Torvalds struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc, 6591da177e4SLinus Torvalds const __u32 lowest_tsn, 6601da177e4SLinus Torvalds const struct sctp_chunk *chunk) 6611da177e4SLinus Torvalds { 6621da177e4SLinus Torvalds struct sctp_chunk *retval; 66365f77105SXin Long struct sctp_cwrhdr cwr; 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds cwr.lowest_tsn = htonl(lowest_tsn); 666072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_CWR, 0, 66765f77105SXin Long sizeof(cwr), GFP_ATOMIC); 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds if (!retval) 6701da177e4SLinus Torvalds goto nodata; 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds retval->subh.ecn_cwr_hdr = 6731da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(cwr), &cwr); 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 6761da177e4SLinus Torvalds * 6771da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 6781da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 6791da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 6801da177e4SLinus Torvalds * to which it is replying. 6811da177e4SLinus Torvalds * 6821da177e4SLinus Torvalds * [Report a reduced congestion window back to where the ECNE 6831da177e4SLinus Torvalds * came from.] 6841da177e4SLinus Torvalds */ 6851da177e4SLinus Torvalds if (chunk) 6861da177e4SLinus Torvalds retval->transport = chunk->transport; 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds nodata: 6891da177e4SLinus Torvalds return retval; 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds /* Make an ECNE chunk. This is a congestion experienced report. */ 6931da177e4SLinus Torvalds struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc, 6941da177e4SLinus Torvalds const __u32 lowest_tsn) 6951da177e4SLinus Torvalds { 6961da177e4SLinus Torvalds struct sctp_chunk *retval; 6971fb6d83bSXin Long struct sctp_ecnehdr ecne; 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds ecne.lowest_tsn = htonl(lowest_tsn); 700072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ECN_ECNE, 0, 7011fb6d83bSXin Long sizeof(ecne), GFP_ATOMIC); 7021da177e4SLinus Torvalds if (!retval) 7031da177e4SLinus Torvalds goto nodata; 7041da177e4SLinus Torvalds retval->subh.ecne_hdr = 7051da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ecne), &ecne); 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds nodata: 7081da177e4SLinus Torvalds return retval; 7091da177e4SLinus Torvalds } 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds /* Make a DATA chunk for the given association from the provided 7121da177e4SLinus Torvalds * parameters. However, do not populate the data payload. 7131da177e4SLinus Torvalds */ 7141da177e4SLinus Torvalds struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc, 7151da177e4SLinus Torvalds const struct sctp_sndrcvinfo *sinfo, 716cea8768fSMarcelo Ricardo Leitner int data_len, __u8 flags, __u16 ssn, 717cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 7181da177e4SLinus Torvalds { 7191da177e4SLinus Torvalds struct sctp_chunk *retval; 7201da177e4SLinus Torvalds struct sctp_datahdr dp; 7211da177e4SLinus Torvalds int chunk_len; 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds /* We assign the TSN as LATE as possible, not here when 7241da177e4SLinus Torvalds * creating the chunk. 7251da177e4SLinus Torvalds */ 7261da177e4SLinus Torvalds dp.tsn = 0; 7271da177e4SLinus Torvalds dp.stream = htons(sinfo->sinfo_stream); 7281da177e4SLinus Torvalds dp.ppid = sinfo->sinfo_ppid; 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds /* Set the flags for an unordered send. */ 731eaa5c54dSIvan Skytte Jorgensen if (sinfo->sinfo_flags & SCTP_UNORDERED) { 7321da177e4SLinus Torvalds flags |= SCTP_DATA_UNORDERED; 7331da177e4SLinus Torvalds dp.ssn = 0; 7341da177e4SLinus Torvalds } else 7351da177e4SLinus Torvalds dp.ssn = htons(ssn); 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds chunk_len = sizeof(dp) + data_len; 738cea8768fSMarcelo Ricardo Leitner retval = sctp_make_data(asoc, flags, chunk_len, gfp); 7391da177e4SLinus Torvalds if (!retval) 7401da177e4SLinus Torvalds goto nodata; 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp); 7431da177e4SLinus Torvalds memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo)); 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds nodata: 7461da177e4SLinus Torvalds return retval; 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds /* Create a selective ackowledgement (SACK) for the given 7501da177e4SLinus Torvalds * association. This reports on which TSN's we've seen to date, 7511da177e4SLinus Torvalds * including duplicates and gaps. 7521da177e4SLinus Torvalds */ 7531da177e4SLinus Torvalds struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc) 7541da177e4SLinus Torvalds { 755327c0dabSXin Long struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; 756327c0dabSXin Long struct sctp_association *aptr = (struct sctp_association *)asoc; 757327c0dabSXin Long struct sctp_gap_ack_block gabs[SCTP_MAX_GABS]; 758327c0dabSXin Long __u16 num_gabs, num_dup_tsns; 759327c0dabSXin Long struct sctp_transport *trans; 7601da177e4SLinus Torvalds struct sctp_chunk *retval; 7611da177e4SLinus Torvalds struct sctp_sackhdr sack; 7621da177e4SLinus Torvalds __u32 ctsn; 763327c0dabSXin Long int len; 7641da177e4SLinus Torvalds 76502015180SVlad Yasevich memset(gabs, 0, sizeof(gabs)); 7661da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(map); 767bb33381dSDaniel Borkmann 768bb33381dSDaniel Borkmann pr_debug("%s: sackCTSNAck sent:0x%x\n", __func__, ctsn); 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds /* How much room is needed in the chunk? */ 77102015180SVlad Yasevich num_gabs = sctp_tsnmap_num_gabs(map, gabs); 7721da177e4SLinus Torvalds num_dup_tsns = sctp_tsnmap_num_dups(map); 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds /* Initialize the SACK header. */ 7751da177e4SLinus Torvalds sack.cum_tsn_ack = htonl(ctsn); 7761da177e4SLinus Torvalds sack.a_rwnd = htonl(asoc->a_rwnd); 7771da177e4SLinus Torvalds sack.num_gap_ack_blocks = htons(num_gabs); 7781da177e4SLinus Torvalds sack.num_dup_tsns = htons(num_dup_tsns); 7791da177e4SLinus Torvalds 7801da177e4SLinus Torvalds len = sizeof(sack) 7811da177e4SLinus Torvalds + sizeof(struct sctp_gap_ack_block) * num_gabs 7821da177e4SLinus Torvalds + sizeof(__u32) * num_dup_tsns; 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds /* Create the chunk. */ 785cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SACK, 0, len, GFP_ATOMIC); 7861da177e4SLinus Torvalds if (!retval) 7871da177e4SLinus Torvalds goto nodata; 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 7901da177e4SLinus Torvalds * 7911da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 7921da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 7931da177e4SLinus Torvalds * address from which it received the DATA or control chunk to 7941da177e4SLinus Torvalds * which it is replying. This rule should also be followed if 7951da177e4SLinus Torvalds * the endpoint is bundling DATA chunks together with the 7961da177e4SLinus Torvalds * reply chunk. 7971da177e4SLinus Torvalds * 7981da177e4SLinus Torvalds * However, when acknowledging multiple DATA chunks received 7991da177e4SLinus Torvalds * in packets from different source addresses in a single 8001da177e4SLinus Torvalds * SACK, the SACK chunk may be transmitted to one of the 8011da177e4SLinus Torvalds * destination transport addresses from which the DATA or 8021da177e4SLinus Torvalds * control chunks being acknowledged were received. 8031da177e4SLinus Torvalds * 8041da177e4SLinus Torvalds * [BUG: We do not implement the following paragraph. 8051da177e4SLinus Torvalds * Perhaps we should remember the last transport we used for a 8061da177e4SLinus Torvalds * SACK and avoid that (if possible) if we have seen any 8071da177e4SLinus Torvalds * duplicates. --piggy] 8081da177e4SLinus Torvalds * 8091da177e4SLinus Torvalds * When a receiver of a duplicate DATA chunk sends a SACK to a 8101da177e4SLinus Torvalds * multi- homed endpoint it MAY be beneficial to vary the 8111da177e4SLinus Torvalds * destination address and not use the source address of the 8121da177e4SLinus Torvalds * DATA chunk. The reason being that receiving a duplicate 8131da177e4SLinus Torvalds * from a multi-homed endpoint might indicate that the return 8141da177e4SLinus Torvalds * path (as specified in the source address of the DATA chunk) 8151da177e4SLinus Torvalds * for the SACK is broken. 8161da177e4SLinus Torvalds * 8171da177e4SLinus Torvalds * [Send to the address from which we last received a DATA chunk.] 8181da177e4SLinus Torvalds */ 8191da177e4SLinus Torvalds retval->transport = asoc->peer.last_data_from; 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds retval->subh.sack_hdr = 8221da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(sack), &sack); 8231da177e4SLinus Torvalds 8241da177e4SLinus Torvalds /* Add the gap ack block information. */ 8251da177e4SLinus Torvalds if (num_gabs) 8261da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_gabs, 82702015180SVlad Yasevich gabs); 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds /* Add the duplicate TSN information. */ 830196d6759SMichele Baldessari if (num_dup_tsns) { 831196d6759SMichele Baldessari aptr->stats.idupchunks += num_dup_tsns; 8321da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns, 8331da177e4SLinus Torvalds sctp_tsnmap_get_dups(map)); 834196d6759SMichele Baldessari } 8354244854dSNeil Horman /* Once we have a sack generated, check to see what our sack 8364244854dSNeil Horman * generation is, if its 0, reset the transports to 0, and reset 8374244854dSNeil Horman * the association generation to 1 8384244854dSNeil Horman * 8394244854dSNeil Horman * The idea is that zero is never used as a valid generation for the 8404244854dSNeil Horman * association so no transport will match after a wrap event like this, 8414244854dSNeil Horman * Until the next sack 8424244854dSNeil Horman */ 8434244854dSNeil Horman if (++aptr->peer.sack_generation == 0) { 8444244854dSNeil Horman list_for_each_entry(trans, &asoc->peer.transport_addr_list, 8454244854dSNeil Horman transports) 8464244854dSNeil Horman trans->sack_generation = 0; 8474244854dSNeil Horman aptr->peer.sack_generation = 1; 8484244854dSNeil Horman } 8491da177e4SLinus Torvalds nodata: 8501da177e4SLinus Torvalds return retval; 8511da177e4SLinus Torvalds } 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds /* Make a SHUTDOWN chunk. */ 8541da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, 8551da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8561da177e4SLinus Torvalds { 857e61e4055SXin Long struct sctp_shutdownhdr shut; 8581da177e4SLinus Torvalds struct sctp_chunk *retval; 8591da177e4SLinus Torvalds __u32 ctsn; 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); 8621da177e4SLinus Torvalds shut.cum_tsn_ack = htonl(ctsn); 8631da177e4SLinus Torvalds 864072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0, 865e61e4055SXin Long sizeof(shut), GFP_ATOMIC); 8661da177e4SLinus Torvalds if (!retval) 8671da177e4SLinus Torvalds goto nodata; 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds retval->subh.shutdown_hdr = 8701da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(shut), &shut); 8711da177e4SLinus Torvalds 8721da177e4SLinus Torvalds if (chunk) 8731da177e4SLinus Torvalds retval->transport = chunk->transport; 8741da177e4SLinus Torvalds nodata: 8751da177e4SLinus Torvalds return retval; 8761da177e4SLinus Torvalds } 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, 8791da177e4SLinus Torvalds const struct sctp_chunk *chunk) 8801da177e4SLinus Torvalds { 8811da177e4SLinus Torvalds struct sctp_chunk *retval; 8821da177e4SLinus Torvalds 883cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0, 884cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 8871da177e4SLinus Torvalds * 8881da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 8891da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 8901da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 8911da177e4SLinus Torvalds * to which it is replying. 8921da177e4SLinus Torvalds * 8931da177e4SLinus Torvalds * [ACK back to where the SHUTDOWN came from.] 8941da177e4SLinus Torvalds */ 8951da177e4SLinus Torvalds if (retval && chunk) 8961da177e4SLinus Torvalds retval->transport = chunk->transport; 8971da177e4SLinus Torvalds 8981da177e4SLinus Torvalds return retval; 8991da177e4SLinus Torvalds } 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds struct sctp_chunk *sctp_make_shutdown_complete( 9021da177e4SLinus Torvalds const struct sctp_association *asoc, 9031da177e4SLinus Torvalds const struct sctp_chunk *chunk) 9041da177e4SLinus Torvalds { 9051da177e4SLinus Torvalds struct sctp_chunk *retval; 9061da177e4SLinus Torvalds __u8 flags = 0; 9071da177e4SLinus Torvalds 908047a2428SJerome Forissier /* Set the T-bit if we have no association (vtag will be 909047a2428SJerome Forissier * reflected) 910047a2428SJerome Forissier */ 9111da177e4SLinus Torvalds flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T; 9121da177e4SLinus Torvalds 913cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 914cea8768fSMarcelo Ricardo Leitner 0, GFP_ATOMIC); 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9171da177e4SLinus Torvalds * 9181da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9191da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9201da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9211da177e4SLinus Torvalds * to which it is replying. 9221da177e4SLinus Torvalds * 9231da177e4SLinus Torvalds * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK 9241da177e4SLinus Torvalds * came from.] 9251da177e4SLinus Torvalds */ 9261da177e4SLinus Torvalds if (retval && chunk) 9271da177e4SLinus Torvalds retval->transport = chunk->transport; 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds return retval; 9301da177e4SLinus Torvalds } 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds /* Create an ABORT. Note that we set the T bit if we have no 933047a2428SJerome Forissier * association, except when responding to an INIT (sctpimpguide 2.41). 9341da177e4SLinus Torvalds */ 9351da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc, 9361da177e4SLinus Torvalds const struct sctp_chunk *chunk, 9371da177e4SLinus Torvalds const size_t hint) 9381da177e4SLinus Torvalds { 9391da177e4SLinus Torvalds struct sctp_chunk *retval; 9401da177e4SLinus Torvalds __u8 flags = 0; 9411da177e4SLinus Torvalds 942047a2428SJerome Forissier /* Set the T-bit if we have no association and 'chunk' is not 943047a2428SJerome Forissier * an INIT (vtag will be reflected). 944047a2428SJerome Forissier */ 945047a2428SJerome Forissier if (!asoc) { 946047a2428SJerome Forissier if (chunk && chunk->chunk_hdr && 947047a2428SJerome Forissier chunk->chunk_hdr->type == SCTP_CID_INIT) 948047a2428SJerome Forissier flags = 0; 949047a2428SJerome Forissier else 950047a2428SJerome Forissier flags = SCTP_CHUNK_FLAG_T; 951047a2428SJerome Forissier } 9521da177e4SLinus Torvalds 953cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ABORT, flags, hint, 954cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 9551da177e4SLinus Torvalds 9561da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9571da177e4SLinus Torvalds * 9581da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9591da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9601da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9611da177e4SLinus Torvalds * to which it is replying. 9621da177e4SLinus Torvalds * 9631da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9641da177e4SLinus Torvalds */ 9651da177e4SLinus Torvalds if (retval && chunk) 9661da177e4SLinus Torvalds retval->transport = chunk->transport; 9671da177e4SLinus Torvalds 9681da177e4SLinus Torvalds return retval; 9691da177e4SLinus Torvalds } 9701da177e4SLinus Torvalds 9711da177e4SLinus Torvalds /* Helper to create ABORT with a NO_USER_DATA error. */ 9721da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_no_data( 9731da177e4SLinus Torvalds const struct sctp_association *asoc, 974327c0dabSXin Long const struct sctp_chunk *chunk, 975327c0dabSXin Long __u32 tsn) 9761da177e4SLinus Torvalds { 9771da177e4SLinus Torvalds struct sctp_chunk *retval; 9789f81bcd9SAl Viro __be32 payload; 9791da177e4SLinus Torvalds 980d8238d9dSXin Long retval = sctp_make_abort(asoc, chunk, 981d8238d9dSXin Long sizeof(struct sctp_errhdr) + sizeof(tsn)); 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds if (!retval) 9841da177e4SLinus Torvalds goto no_mem; 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds /* Put the tsn back into network byte order. */ 9871da177e4SLinus Torvalds payload = htonl(tsn); 98800f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload)); 98900f1c2dfSWei Yongjun sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload); 9901da177e4SLinus Torvalds 9911da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 9921da177e4SLinus Torvalds * 9931da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 9941da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 9951da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 9961da177e4SLinus Torvalds * to which it is replying. 9971da177e4SLinus Torvalds * 9981da177e4SLinus Torvalds * [ABORT back to where the offender came from.] 9991da177e4SLinus Torvalds */ 10001da177e4SLinus Torvalds if (chunk) 10011da177e4SLinus Torvalds retval->transport = chunk->transport; 10021da177e4SLinus Torvalds 10031da177e4SLinus Torvalds no_mem: 10041da177e4SLinus Torvalds return retval; 10051da177e4SLinus Torvalds } 10061da177e4SLinus Torvalds 10071da177e4SLinus Torvalds /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */ 10081da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc, 10096ce8e9ceSAl Viro struct msghdr *msg, 1010c164a9baSSridhar Samudrala size_t paylen) 10111da177e4SLinus Torvalds { 10121da177e4SLinus Torvalds struct sctp_chunk *retval; 1013c164a9baSSridhar Samudrala void *payload = NULL; 1014c164a9baSSridhar Samudrala int err; 10151da177e4SLinus Torvalds 1016d8238d9dSXin Long retval = sctp_make_abort(asoc, NULL, 1017d8238d9dSXin Long sizeof(struct sctp_errhdr) + paylen); 10181da177e4SLinus Torvalds if (!retval) 10191da177e4SLinus Torvalds goto err_chunk; 10201da177e4SLinus Torvalds 10211da177e4SLinus Torvalds if (paylen) { 10221da177e4SLinus Torvalds /* Put the msg_iov together into payload. */ 1023c164a9baSSridhar Samudrala payload = kmalloc(paylen, GFP_KERNEL); 10241da177e4SLinus Torvalds if (!payload) 10251da177e4SLinus Torvalds goto err_payload; 10261da177e4SLinus Torvalds 10276ce8e9ceSAl Viro err = memcpy_from_msg(payload, msg, paylen); 1028c164a9baSSridhar Samudrala if (err < 0) 10291da177e4SLinus Torvalds goto err_copy; 10301da177e4SLinus Torvalds } 10311da177e4SLinus Torvalds 103200f1c2dfSWei Yongjun sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen); 103300f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10341da177e4SLinus Torvalds 10351da177e4SLinus Torvalds if (paylen) 10361da177e4SLinus Torvalds kfree(payload); 10371da177e4SLinus Torvalds 10381da177e4SLinus Torvalds return retval; 10391da177e4SLinus Torvalds 10401da177e4SLinus Torvalds err_copy: 10411da177e4SLinus Torvalds kfree(payload); 10421da177e4SLinus Torvalds err_payload: 10431da177e4SLinus Torvalds sctp_chunk_free(retval); 10441da177e4SLinus Torvalds retval = NULL; 10451da177e4SLinus Torvalds err_chunk: 10461da177e4SLinus Torvalds return retval; 10471da177e4SLinus Torvalds } 10481da177e4SLinus Torvalds 10495c94bf86SAdrian Bunk /* Append bytes to the end of a parameter. Will panic if chunk is not big 10505c94bf86SAdrian Bunk * enough. 10515c94bf86SAdrian Bunk */ 10525c94bf86SAdrian Bunk static void *sctp_addto_param(struct sctp_chunk *chunk, int len, 10535c94bf86SAdrian Bunk const void *data) 10545c94bf86SAdrian Bunk { 10555c94bf86SAdrian Bunk int chunklen = ntohs(chunk->chunk_hdr->length); 1056327c0dabSXin Long void *target; 10575c94bf86SAdrian Bunk 10585c94bf86SAdrian Bunk target = skb_put(chunk->skb, len); 10595c94bf86SAdrian Bunk 10606383cfb3SVlad Yasevich if (data) 10615c94bf86SAdrian Bunk memcpy(target, data, len); 10626383cfb3SVlad Yasevich else 10636383cfb3SVlad Yasevich memset(target, 0, len); 10645c94bf86SAdrian Bunk 10655c94bf86SAdrian Bunk /* Adjust the chunk length field. */ 10665c94bf86SAdrian Bunk chunk->chunk_hdr->length = htons(chunklen + len); 10675c94bf86SAdrian Bunk chunk->chunk_end = skb_tail_pointer(chunk->skb); 10685c94bf86SAdrian Bunk 10695c94bf86SAdrian Bunk return target; 10705c94bf86SAdrian Bunk } 10715c94bf86SAdrian Bunk 10721da177e4SLinus Torvalds /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */ 10731da177e4SLinus Torvalds struct sctp_chunk *sctp_make_abort_violation( 10741da177e4SLinus Torvalds const struct sctp_association *asoc, 10751da177e4SLinus Torvalds const struct sctp_chunk *chunk, 10761da177e4SLinus Torvalds const __u8 *payload, 10771da177e4SLinus Torvalds const size_t paylen) 10781da177e4SLinus Torvalds { 10791da177e4SLinus Torvalds struct sctp_chunk *retval; 10801da177e4SLinus Torvalds struct sctp_paramhdr phdr; 10811da177e4SLinus Torvalds 1082d8238d9dSXin Long retval = sctp_make_abort(asoc, chunk, sizeof(struct sctp_errhdr) + 1083d8238d9dSXin Long paylen + sizeof(phdr)); 10841da177e4SLinus Torvalds if (!retval) 10851da177e4SLinus Torvalds goto end; 10861da177e4SLinus Torvalds 10873c918704SXin Long sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen + 10883c918704SXin Long sizeof(phdr)); 10891da177e4SLinus Torvalds 10901da177e4SLinus Torvalds phdr.type = htons(chunk->chunk_hdr->type); 10911da177e4SLinus Torvalds phdr.length = chunk->chunk_hdr->length; 109200f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 10933c918704SXin Long sctp_addto_param(retval, sizeof(phdr), &phdr); 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds end: 10961da177e4SLinus Torvalds return retval; 10971da177e4SLinus Torvalds } 10981da177e4SLinus Torvalds 1099ba016670SWei Yongjun struct sctp_chunk *sctp_make_violation_paramlen( 1100ba016670SWei Yongjun const struct sctp_association *asoc, 1101ba016670SWei Yongjun const struct sctp_chunk *chunk, 1102ba016670SWei Yongjun struct sctp_paramhdr *param) 1103ba016670SWei Yongjun { 1104ba016670SWei Yongjun static const char error[] = "The following parameter had invalid length:"; 1105d8238d9dSXin Long size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr) + 11063c918704SXin Long sizeof(*param); 1107327c0dabSXin Long struct sctp_chunk *retval; 1108ba016670SWei Yongjun 1109ba016670SWei Yongjun retval = sctp_make_abort(asoc, chunk, payload_len); 1110ba016670SWei Yongjun if (!retval) 1111ba016670SWei Yongjun goto nodata; 1112ba016670SWei Yongjun 1113ba016670SWei Yongjun sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, 11143c918704SXin Long sizeof(error) + sizeof(*param)); 1115ba016670SWei Yongjun sctp_addto_chunk(retval, sizeof(error), error); 11163c918704SXin Long sctp_addto_param(retval, sizeof(*param), param); 1117ba016670SWei Yongjun 1118ba016670SWei Yongjun nodata: 1119ba016670SWei Yongjun return retval; 1120ba016670SWei Yongjun } 1121ba016670SWei Yongjun 1122de4594a5SNeil Horman struct sctp_chunk *sctp_make_violation_max_retrans( 1123de4594a5SNeil Horman const struct sctp_association *asoc, 1124de4594a5SNeil Horman const struct sctp_chunk *chunk) 1125de4594a5SNeil Horman { 1126de4594a5SNeil Horman static const char error[] = "Association exceeded its max_retans count"; 1127d8238d9dSXin Long size_t payload_len = sizeof(error) + sizeof(struct sctp_errhdr); 1128327c0dabSXin Long struct sctp_chunk *retval; 1129de4594a5SNeil Horman 1130de4594a5SNeil Horman retval = sctp_make_abort(asoc, chunk, payload_len); 1131de4594a5SNeil Horman if (!retval) 1132de4594a5SNeil Horman goto nodata; 1133de4594a5SNeil Horman 1134de4594a5SNeil Horman sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, sizeof(error)); 1135de4594a5SNeil Horman sctp_addto_chunk(retval, sizeof(error), error); 1136de4594a5SNeil Horman 1137de4594a5SNeil Horman nodata: 1138de4594a5SNeil Horman return retval; 1139de4594a5SNeil Horman } 1140de4594a5SNeil Horman 11411da177e4SLinus Torvalds /* Make a HEARTBEAT chunk. */ 11421da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, 114392c73af5SWei Yongjun const struct sctp_transport *transport) 11441da177e4SLinus Torvalds { 1145edf903f8SXin Long struct sctp_sender_hb_info hbinfo; 114692c73af5SWei Yongjun struct sctp_chunk *retval; 114792c73af5SWei Yongjun 1148cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0, 1149cea8768fSMarcelo Ricardo Leitner sizeof(hbinfo), GFP_ATOMIC); 11501da177e4SLinus Torvalds 11511da177e4SLinus Torvalds if (!retval) 11521da177e4SLinus Torvalds goto nodata; 11531da177e4SLinus Torvalds 115492c73af5SWei Yongjun hbinfo.param_hdr.type = SCTP_PARAM_HEARTBEAT_INFO; 1155edf903f8SXin Long hbinfo.param_hdr.length = htons(sizeof(hbinfo)); 115692c73af5SWei Yongjun hbinfo.daddr = transport->ipaddr; 115792c73af5SWei Yongjun hbinfo.sent_at = jiffies; 115892c73af5SWei Yongjun hbinfo.hb_nonce = transport->hb_nonce; 115992c73af5SWei Yongjun 11601da177e4SLinus Torvalds /* Cast away the 'const', as this is just telling the chunk 11611da177e4SLinus Torvalds * what transport it belongs to. 11621da177e4SLinus Torvalds */ 11631da177e4SLinus Torvalds retval->transport = (struct sctp_transport *) transport; 116492c73af5SWei Yongjun retval->subh.hbs_hdr = sctp_addto_chunk(retval, sizeof(hbinfo), 116592c73af5SWei Yongjun &hbinfo); 11661da177e4SLinus Torvalds 11671da177e4SLinus Torvalds nodata: 11681da177e4SLinus Torvalds return retval; 11691da177e4SLinus Torvalds } 11701da177e4SLinus Torvalds 11711da177e4SLinus Torvalds struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc, 11721da177e4SLinus Torvalds const struct sctp_chunk *chunk, 1173327c0dabSXin Long const void *payload, 1174327c0dabSXin Long const size_t paylen) 11751da177e4SLinus Torvalds { 11761da177e4SLinus Torvalds struct sctp_chunk *retval; 11771da177e4SLinus Torvalds 1178cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen, 1179cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 11801da177e4SLinus Torvalds if (!retval) 11811da177e4SLinus Torvalds goto nodata; 11821da177e4SLinus Torvalds 11831da177e4SLinus Torvalds retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload); 11841da177e4SLinus Torvalds 11851da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 11861da177e4SLinus Torvalds * 11871da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 11881da177e4SLinus Torvalds * HEARTBEAT ACK, * etc.) to the same destination transport 11891da177e4SLinus Torvalds * address from which it * received the DATA or control chunk 11901da177e4SLinus Torvalds * to which it is replying. 11911da177e4SLinus Torvalds * 11921da177e4SLinus Torvalds * [HBACK back to where the HEARTBEAT came from.] 11931da177e4SLinus Torvalds */ 11941da177e4SLinus Torvalds if (chunk) 11951da177e4SLinus Torvalds retval->transport = chunk->transport; 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds nodata: 11981da177e4SLinus Torvalds return retval; 11991da177e4SLinus Torvalds } 12001da177e4SLinus Torvalds 12011da177e4SLinus Torvalds /* Create an Operation Error chunk with the specified space reserved. 12021da177e4SLinus Torvalds * This routine can be used for containing multiple causes in the chunk. 12031da177e4SLinus Torvalds */ 12041da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_op_error_space( 12051da177e4SLinus Torvalds const struct sctp_association *asoc, 12061da177e4SLinus Torvalds const struct sctp_chunk *chunk, 12071da177e4SLinus Torvalds size_t size) 12081da177e4SLinus Torvalds { 12091da177e4SLinus Torvalds struct sctp_chunk *retval; 12101da177e4SLinus Torvalds 1211072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_ERROR, 0, 1212d8238d9dSXin Long sizeof(struct sctp_errhdr) + size, 1213d8238d9dSXin Long GFP_ATOMIC); 12141da177e4SLinus Torvalds if (!retval) 12151da177e4SLinus Torvalds goto nodata; 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds /* RFC 2960 6.4 Multi-homed SCTP Endpoints 12181da177e4SLinus Torvalds * 12191da177e4SLinus Torvalds * An endpoint SHOULD transmit reply chunks (e.g., SACK, 12201da177e4SLinus Torvalds * HEARTBEAT ACK, etc.) to the same destination transport 12211da177e4SLinus Torvalds * address from which it received the DATA or control chunk 12221da177e4SLinus Torvalds * to which it is replying. 12231da177e4SLinus Torvalds * 12241da177e4SLinus Torvalds */ 12251da177e4SLinus Torvalds if (chunk) 12261da177e4SLinus Torvalds retval->transport = chunk->transport; 12271da177e4SLinus Torvalds 12281da177e4SLinus Torvalds nodata: 12291da177e4SLinus Torvalds return retval; 12301da177e4SLinus Torvalds } 12311da177e4SLinus Torvalds 12325fa782c2SNeil Horman /* Create an Operation Error chunk of a fixed size, 12335fa782c2SNeil Horman * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) 12345fa782c2SNeil Horman * This is a helper function to allocate an error chunk for 12355fa782c2SNeil Horman * for those invalid parameter codes in which we may not want 1236d82603c6SJorrit Schippers * to report all the errors, if the incoming chunk is large 12375fa782c2SNeil Horman */ 12385fa782c2SNeil Horman static inline struct sctp_chunk *sctp_make_op_error_fixed( 12395fa782c2SNeil Horman const struct sctp_association *asoc, 12405fa782c2SNeil Horman const struct sctp_chunk *chunk) 12415fa782c2SNeil Horman { 12425fa782c2SNeil Horman size_t size = asoc ? asoc->pathmtu : 0; 12435fa782c2SNeil Horman 12445fa782c2SNeil Horman if (!size) 12455fa782c2SNeil Horman size = SCTP_DEFAULT_MAXSEGMENT; 12465fa782c2SNeil Horman 12475fa782c2SNeil Horman return sctp_make_op_error_space(asoc, chunk, size); 12485fa782c2SNeil Horman } 12495fa782c2SNeil Horman 12501da177e4SLinus Torvalds /* Create an Operation Error chunk. */ 12511da177e4SLinus Torvalds struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc, 12521da177e4SLinus Torvalds const struct sctp_chunk *chunk, 125363706c5cSAl Viro __be16 cause_code, const void *payload, 12546383cfb3SVlad Yasevich size_t paylen, size_t reserve_tail) 12551da177e4SLinus Torvalds { 12561da177e4SLinus Torvalds struct sctp_chunk *retval; 12571da177e4SLinus Torvalds 12586383cfb3SVlad Yasevich retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail); 12591da177e4SLinus Torvalds if (!retval) 12601da177e4SLinus Torvalds goto nodata; 12611da177e4SLinus Torvalds 12626383cfb3SVlad Yasevich sctp_init_cause(retval, cause_code, paylen + reserve_tail); 126300f1c2dfSWei Yongjun sctp_addto_chunk(retval, paylen, payload); 12646383cfb3SVlad Yasevich if (reserve_tail) 12656383cfb3SVlad Yasevich sctp_addto_param(retval, reserve_tail, NULL); 12661da177e4SLinus Torvalds 12671da177e4SLinus Torvalds nodata: 12681da177e4SLinus Torvalds return retval; 12691da177e4SLinus Torvalds } 12701da177e4SLinus Torvalds 12714cd57c80SVlad Yasevich struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc) 12724cd57c80SVlad Yasevich { 12734cd57c80SVlad Yasevich struct sctp_authhdr auth_hdr; 1274327c0dabSXin Long struct sctp_hmac *hmac_desc; 1275327c0dabSXin Long struct sctp_chunk *retval; 12764cd57c80SVlad Yasevich __u8 *hmac; 12774cd57c80SVlad Yasevich 12784cd57c80SVlad Yasevich /* Get the first hmac that the peer told us to use */ 12794cd57c80SVlad Yasevich hmac_desc = sctp_auth_asoc_get_hmac(asoc); 12804cd57c80SVlad Yasevich if (unlikely(!hmac_desc)) 12814cd57c80SVlad Yasevich return NULL; 12824cd57c80SVlad Yasevich 1283072017b4SVlad Yasevich retval = sctp_make_control(asoc, SCTP_CID_AUTH, 0, 128496f7ef4dSXin Long hmac_desc->hmac_len + sizeof(auth_hdr), 1285cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 12864cd57c80SVlad Yasevich if (!retval) 12874cd57c80SVlad Yasevich return NULL; 12884cd57c80SVlad Yasevich 12894cd57c80SVlad Yasevich auth_hdr.hmac_id = htons(hmac_desc->hmac_id); 12904cd57c80SVlad Yasevich auth_hdr.shkey_id = htons(asoc->active_key_id); 12914cd57c80SVlad Yasevich 129296f7ef4dSXin Long retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(auth_hdr), 12934cd57c80SVlad Yasevich &auth_hdr); 12944cd57c80SVlad Yasevich 1295aa9f979cSJohannes Berg hmac = skb_put_zero(retval->skb, hmac_desc->hmac_len); 12964cd57c80SVlad Yasevich 12974cd57c80SVlad Yasevich /* Adjust the chunk header to include the empty MAC */ 12984cd57c80SVlad Yasevich retval->chunk_hdr->length = 12994cd57c80SVlad Yasevich htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len); 13004cd57c80SVlad Yasevich retval->chunk_end = skb_tail_pointer(retval->skb); 13014cd57c80SVlad Yasevich 13024cd57c80SVlad Yasevich return retval; 13034cd57c80SVlad Yasevich } 13044cd57c80SVlad Yasevich 13054cd57c80SVlad Yasevich 13061da177e4SLinus Torvalds /******************************************************************** 13071da177e4SLinus Torvalds * 2nd Level Abstractions 13081da177e4SLinus Torvalds ********************************************************************/ 13091da177e4SLinus Torvalds 13101da177e4SLinus Torvalds /* Turn an skb into a chunk. 13111da177e4SLinus Torvalds * FIXME: Eventually move the structure directly inside the skb->cb[]. 13123dc0a548Swangweidong * 13133dc0a548Swangweidong * sctpimpguide-05.txt Section 2.8.2 13143dc0a548Swangweidong * M1) Each time a new DATA chunk is transmitted 13153dc0a548Swangweidong * set the 'TSN.Missing.Report' count for that TSN to 0. The 13163dc0a548Swangweidong * 'TSN.Missing.Report' count will be used to determine missing chunks 13173dc0a548Swangweidong * and when to fast retransmit. 13183dc0a548Swangweidong * 13191da177e4SLinus Torvalds */ 13201da177e4SLinus Torvalds struct sctp_chunk *sctp_chunkify(struct sk_buff *skb, 13211da177e4SLinus Torvalds const struct sctp_association *asoc, 1322cea8768fSMarcelo Ricardo Leitner struct sock *sk, gfp_t gfp) 13231da177e4SLinus Torvalds { 13241da177e4SLinus Torvalds struct sctp_chunk *retval; 13251da177e4SLinus Torvalds 1326cea8768fSMarcelo Ricardo Leitner retval = kmem_cache_zalloc(sctp_chunk_cachep, gfp); 13271da177e4SLinus Torvalds 13281da177e4SLinus Torvalds if (!retval) 13291da177e4SLinus Torvalds goto nodata; 1330bb33381dSDaniel Borkmann if (!sk) 1331bb33381dSDaniel Borkmann pr_debug("%s: chunkifying skb:%p w/o an sk\n", __func__, skb); 13321da177e4SLinus Torvalds 133379af02c2SDavid S. Miller INIT_LIST_HEAD(&retval->list); 13341da177e4SLinus Torvalds retval->skb = skb; 13351da177e4SLinus Torvalds retval->asoc = (struct sctp_association *)asoc; 13361da177e4SLinus Torvalds retval->singleton = 1; 13371da177e4SLinus Torvalds 1338c226ef9bSNeil Horman retval->fast_retransmit = SCTP_CAN_FRTX; 13391da177e4SLinus Torvalds 13401da177e4SLinus Torvalds /* Polish the bead hole. */ 13411da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->transmitted_list); 13421da177e4SLinus Torvalds INIT_LIST_HEAD(&retval->frag_list); 13431da177e4SLinus Torvalds SCTP_DBG_OBJCNT_INC(chunk); 1344e7f02796SReshetova, Elena refcount_set(&retval->refcnt, 1); 13451da177e4SLinus Torvalds 13461da177e4SLinus Torvalds nodata: 13471da177e4SLinus Torvalds return retval; 13481da177e4SLinus Torvalds } 13491da177e4SLinus Torvalds 13501da177e4SLinus Torvalds /* Set chunk->source and dest based on the IP header in chunk->skb. */ 13511da177e4SLinus Torvalds void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src, 13521da177e4SLinus Torvalds union sctp_addr *dest) 13531da177e4SLinus Torvalds { 1354f235fca3SAl Viro memcpy(&chunk->source, src, sizeof(union sctp_addr)); 135516b0a030SAl Viro memcpy(&chunk->dest, dest, sizeof(union sctp_addr)); 13561da177e4SLinus Torvalds } 13571da177e4SLinus Torvalds 13581da177e4SLinus Torvalds /* Extract the source address from a chunk. */ 13591da177e4SLinus Torvalds const union sctp_addr *sctp_source(const struct sctp_chunk *chunk) 13601da177e4SLinus Torvalds { 13611da177e4SLinus Torvalds /* If we have a known transport, use that. */ 13621da177e4SLinus Torvalds if (chunk->transport) { 13636a1e5f33SAl Viro return &chunk->transport->ipaddr; 13641da177e4SLinus Torvalds } else { 13651da177e4SLinus Torvalds /* Otherwise, extract it from the IP header. */ 13666a1e5f33SAl Viro return &chunk->source; 13671da177e4SLinus Torvalds } 13681da177e4SLinus Torvalds } 13691da177e4SLinus Torvalds 13701da177e4SLinus Torvalds /* Create a new chunk, setting the type and flags headers from the 13711da177e4SLinus Torvalds * arguments, reserving enough space for a 'paylen' byte payload. 13721da177e4SLinus Torvalds */ 1373072017b4SVlad Yasevich static struct sctp_chunk *_sctp_make_chunk(const struct sctp_association *asoc, 1374cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1375cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 13761da177e4SLinus Torvalds { 1377922dbc5bSXin Long struct sctp_chunkhdr *chunk_hdr; 1378327c0dabSXin Long struct sctp_chunk *retval; 13791da177e4SLinus Torvalds struct sk_buff *skb; 13801da177e4SLinus Torvalds struct sock *sk; 13811da177e4SLinus Torvalds 13821da177e4SLinus Torvalds /* No need to allocate LL here, as this is only a chunk. */ 1383922dbc5bSXin Long skb = alloc_skb(SCTP_PAD4(sizeof(*chunk_hdr) + paylen), gfp); 13841da177e4SLinus Torvalds if (!skb) 13851da177e4SLinus Torvalds goto nodata; 13861da177e4SLinus Torvalds 13871da177e4SLinus Torvalds /* Make room for the chunk header. */ 1388922dbc5bSXin Long chunk_hdr = (struct sctp_chunkhdr *)skb_put(skb, sizeof(*chunk_hdr)); 13891da177e4SLinus Torvalds chunk_hdr->type = type; 13901da177e4SLinus Torvalds chunk_hdr->flags = flags; 1391922dbc5bSXin Long chunk_hdr->length = htons(sizeof(*chunk_hdr)); 13921da177e4SLinus Torvalds 13931da177e4SLinus Torvalds sk = asoc ? asoc->base.sk : NULL; 1394cea8768fSMarcelo Ricardo Leitner retval = sctp_chunkify(skb, asoc, sk, gfp); 13951da177e4SLinus Torvalds if (!retval) { 13961da177e4SLinus Torvalds kfree_skb(skb); 13971da177e4SLinus Torvalds goto nodata; 13981da177e4SLinus Torvalds } 13991da177e4SLinus Torvalds 14001da177e4SLinus Torvalds retval->chunk_hdr = chunk_hdr; 1401922dbc5bSXin Long retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(*chunk_hdr); 14021da177e4SLinus Torvalds 14034cd57c80SVlad Yasevich /* Determine if the chunk needs to be authenticated */ 14044cd57c80SVlad Yasevich if (sctp_auth_send_cid(type, asoc)) 14054cd57c80SVlad Yasevich retval->auth = 1; 14064cd57c80SVlad Yasevich 14071da177e4SLinus Torvalds return retval; 14081da177e4SLinus Torvalds nodata: 14091da177e4SLinus Torvalds return NULL; 14101da177e4SLinus Torvalds } 14111da177e4SLinus Torvalds 1412072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_data(const struct sctp_association *asoc, 1413cea8768fSMarcelo Ricardo Leitner __u8 flags, int paylen, gfp_t gfp) 1414072017b4SVlad Yasevich { 1415cea8768fSMarcelo Ricardo Leitner return _sctp_make_chunk(asoc, SCTP_CID_DATA, flags, paylen, gfp); 1416072017b4SVlad Yasevich } 1417072017b4SVlad Yasevich 1418072017b4SVlad Yasevich static struct sctp_chunk *sctp_make_control(const struct sctp_association *asoc, 1419cea8768fSMarcelo Ricardo Leitner __u8 type, __u8 flags, int paylen, 1420cea8768fSMarcelo Ricardo Leitner gfp_t gfp) 1421072017b4SVlad Yasevich { 1422cea8768fSMarcelo Ricardo Leitner struct sctp_chunk *chunk; 1423072017b4SVlad Yasevich 1424cea8768fSMarcelo Ricardo Leitner chunk = _sctp_make_chunk(asoc, type, flags, paylen, gfp); 1425072017b4SVlad Yasevich if (chunk) 1426072017b4SVlad Yasevich sctp_control_set_owner_w(chunk); 1427072017b4SVlad Yasevich 1428072017b4SVlad Yasevich return chunk; 1429072017b4SVlad Yasevich } 14301da177e4SLinus Torvalds 14311da177e4SLinus Torvalds /* Release the memory occupied by a chunk. */ 14321da177e4SLinus Torvalds static void sctp_chunk_destroy(struct sctp_chunk *chunk) 14331da177e4SLinus Torvalds { 1434a08de64dSVlad Yasevich BUG_ON(!list_empty(&chunk->list)); 1435a08de64dSVlad Yasevich list_del_init(&chunk->transmitted_list); 1436a08de64dSVlad Yasevich 1437c485658bSDaniel Borkmann consume_skb(chunk->skb); 1438c485658bSDaniel Borkmann consume_skb(chunk->auth_chunk); 14391da177e4SLinus Torvalds 14401da177e4SLinus Torvalds SCTP_DBG_OBJCNT_DEC(chunk); 14411da177e4SLinus Torvalds kmem_cache_free(sctp_chunk_cachep, chunk); 14421da177e4SLinus Torvalds } 14431da177e4SLinus Torvalds 14441da177e4SLinus Torvalds /* Possibly, free the chunk. */ 14451da177e4SLinus Torvalds void sctp_chunk_free(struct sctp_chunk *chunk) 14461da177e4SLinus Torvalds { 14471da177e4SLinus Torvalds /* Release our reference on the message tracker. */ 14481da177e4SLinus Torvalds if (chunk->msg) 14491da177e4SLinus Torvalds sctp_datamsg_put(chunk->msg); 14501da177e4SLinus Torvalds 14511da177e4SLinus Torvalds sctp_chunk_put(chunk); 14521da177e4SLinus Torvalds } 14531da177e4SLinus Torvalds 14541da177e4SLinus Torvalds /* Grab a reference to the chunk. */ 14551da177e4SLinus Torvalds void sctp_chunk_hold(struct sctp_chunk *ch) 14561da177e4SLinus Torvalds { 1457e7f02796SReshetova, Elena refcount_inc(&ch->refcnt); 14581da177e4SLinus Torvalds } 14591da177e4SLinus Torvalds 14601da177e4SLinus Torvalds /* Release a reference to the chunk. */ 14611da177e4SLinus Torvalds void sctp_chunk_put(struct sctp_chunk *ch) 14621da177e4SLinus Torvalds { 1463e7f02796SReshetova, Elena if (refcount_dec_and_test(&ch->refcnt)) 14641da177e4SLinus Torvalds sctp_chunk_destroy(ch); 14651da177e4SLinus Torvalds } 14661da177e4SLinus Torvalds 14671da177e4SLinus Torvalds /* Append bytes to the end of a chunk. Will panic if chunk is not big 14681da177e4SLinus Torvalds * enough. 14691da177e4SLinus Torvalds */ 14701da177e4SLinus Torvalds void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) 14711da177e4SLinus Torvalds { 14721da177e4SLinus Torvalds int chunklen = ntohs(chunk->chunk_hdr->length); 1473e2f036a9SMarcelo Ricardo Leitner int padlen = SCTP_PAD4(chunklen) - chunklen; 1474327c0dabSXin Long void *target; 14751da177e4SLinus Torvalds 1476b952f4dfSyuan linyu skb_put_zero(chunk->skb, padlen); 147759ae1d12SJohannes Berg target = skb_put_data(chunk->skb, data, len); 14781da177e4SLinus Torvalds 14791da177e4SLinus Torvalds /* Adjust the chunk length field. */ 14801da177e4SLinus Torvalds chunk->chunk_hdr->length = htons(chunklen + padlen + len); 148127a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 14821da177e4SLinus Torvalds 14831da177e4SLinus Torvalds return target; 14841da177e4SLinus Torvalds } 14851da177e4SLinus Torvalds 14865fa782c2SNeil Horman /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient 14875fa782c2SNeil Horman * space in the chunk 14885fa782c2SNeil Horman */ 14896daaf0deSstephen hemminger static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, 14905fa782c2SNeil Horman int len, const void *data) 14915fa782c2SNeil Horman { 14922e3219b5SWei Yongjun if (skb_tailroom(chunk->skb) >= len) 14935fa782c2SNeil Horman return sctp_addto_chunk(chunk, len, data); 14945fa782c2SNeil Horman else 14955fa782c2SNeil Horman return NULL; 14965fa782c2SNeil Horman } 14975fa782c2SNeil Horman 14981da177e4SLinus Torvalds /* Append bytes from user space to the end of a chunk. Will panic if 14991da177e4SLinus Torvalds * chunk is not big enough. 15001da177e4SLinus Torvalds * Returns a kernel err value. 15011da177e4SLinus Torvalds */ 1502e0eb093eSAl Viro int sctp_user_addto_chunk(struct sctp_chunk *chunk, int len, 1503e0eb093eSAl Viro struct iov_iter *from) 15041da177e4SLinus Torvalds { 1505e0eb093eSAl Viro void *target; 15061da177e4SLinus Torvalds 15071da177e4SLinus Torvalds /* Make room in chunk for data. */ 15081da177e4SLinus Torvalds target = skb_put(chunk->skb, len); 15091da177e4SLinus Torvalds 15101da177e4SLinus Torvalds /* Copy data (whole iovec) into chunk */ 15113b6d4dbfSAl Viro if (!copy_from_iter_full(target, len, from)) 1512e0eb093eSAl Viro return -EFAULT; 15131da177e4SLinus Torvalds 15141da177e4SLinus Torvalds /* Adjust the chunk length field. */ 15151da177e4SLinus Torvalds chunk->chunk_hdr->length = 15161da177e4SLinus Torvalds htons(ntohs(chunk->chunk_hdr->length) + len); 151727a884dcSArnaldo Carvalho de Melo chunk->chunk_end = skb_tail_pointer(chunk->skb); 15181da177e4SLinus Torvalds 1519e0eb093eSAl Viro return 0; 15201da177e4SLinus Torvalds } 15211da177e4SLinus Torvalds 15221da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15231da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15241da177e4SLinus Torvalds */ 15251da177e4SLinus Torvalds void sctp_chunk_assign_ssn(struct sctp_chunk *chunk) 15261da177e4SLinus Torvalds { 1527ab3e5e7bSVlad Yasevich struct sctp_stream *stream; 1528327c0dabSXin Long struct sctp_chunk *lchunk; 1529327c0dabSXin Long struct sctp_datamsg *msg; 1530327c0dabSXin Long __u16 ssn, sid; 15311da177e4SLinus Torvalds 15321da177e4SLinus Torvalds if (chunk->has_ssn) 15331da177e4SLinus Torvalds return; 15341da177e4SLinus Torvalds 1535ab3e5e7bSVlad Yasevich /* All fragments will be on the same stream */ 1536ab3e5e7bSVlad Yasevich sid = ntohs(chunk->subh.data_hdr->stream); 1537cee360abSXin Long stream = &chunk->asoc->stream; 1538ab3e5e7bSVlad Yasevich 1539ab3e5e7bSVlad Yasevich /* Now assign the sequence number to the entire message. 1540ab3e5e7bSVlad Yasevich * All fragments must have the same stream sequence number. 1541ab3e5e7bSVlad Yasevich */ 1542ab3e5e7bSVlad Yasevich msg = chunk->msg; 1543ab3e5e7bSVlad Yasevich list_for_each_entry(lchunk, &msg->chunks, frag_list) { 1544ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { 15451da177e4SLinus Torvalds ssn = 0; 15461da177e4SLinus Torvalds } else { 1547ab3e5e7bSVlad Yasevich if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG) 1548a8386317SXin Long ssn = sctp_ssn_next(stream, out, sid); 15491da177e4SLinus Torvalds else 1550a8386317SXin Long ssn = sctp_ssn_peek(stream, out, sid); 15511da177e4SLinus Torvalds } 15521da177e4SLinus Torvalds 1553ab3e5e7bSVlad Yasevich lchunk->subh.data_hdr->ssn = htons(ssn); 1554ab3e5e7bSVlad Yasevich lchunk->has_ssn = 1; 1555ab3e5e7bSVlad Yasevich } 15561da177e4SLinus Torvalds } 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds /* Helper function to assign a TSN if needed. This assumes that both 15591da177e4SLinus Torvalds * the data_hdr and association have already been assigned. 15601da177e4SLinus Torvalds */ 15611da177e4SLinus Torvalds void sctp_chunk_assign_tsn(struct sctp_chunk *chunk) 15621da177e4SLinus Torvalds { 15631da177e4SLinus Torvalds if (!chunk->has_tsn) { 15641da177e4SLinus Torvalds /* This is the last possible instant to 15651da177e4SLinus Torvalds * assign a TSN. 15661da177e4SLinus Torvalds */ 15671da177e4SLinus Torvalds chunk->subh.data_hdr->tsn = 15681da177e4SLinus Torvalds htonl(sctp_association_get_next_tsn(chunk->asoc)); 15691da177e4SLinus Torvalds chunk->has_tsn = 1; 15701da177e4SLinus Torvalds } 15711da177e4SLinus Torvalds } 15721da177e4SLinus Torvalds 15731da177e4SLinus Torvalds /* Create a CLOSED association to use with an incoming packet. */ 15741da177e4SLinus Torvalds struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep, 15753182cd84SAlexey Dobriyan struct sctp_chunk *chunk, 1576dd0fc66fSAl Viro gfp_t gfp) 15771da177e4SLinus Torvalds { 15781da177e4SLinus Torvalds struct sctp_association *asoc; 15791c662018SXin Long enum sctp_scope scope; 15801da177e4SLinus Torvalds struct sk_buff *skb; 15811da177e4SLinus Torvalds 15821da177e4SLinus Torvalds /* Create the bare association. */ 15831da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 15841da177e4SLinus Torvalds asoc = sctp_association_new(ep, ep->base.sk, scope, gfp); 15851da177e4SLinus Torvalds if (!asoc) 15861da177e4SLinus Torvalds goto nodata; 15871da177e4SLinus Torvalds asoc->temp = 1; 15881da177e4SLinus Torvalds skb = chunk->skb; 15891da177e4SLinus Torvalds /* Create an entry for the source address of the packet. */ 1590e7487c86SMarcelo Ricardo Leitner SCTP_INPUT_CB(skb)->af->from_skb(&asoc->c.peer_addr, skb, 1); 1591e7487c86SMarcelo Ricardo Leitner 15921da177e4SLinus Torvalds nodata: 15931da177e4SLinus Torvalds return asoc; 15941da177e4SLinus Torvalds } 15951da177e4SLinus Torvalds 15961da177e4SLinus Torvalds /* Build a cookie representing asoc. 15971da177e4SLinus Torvalds * This INCLUDES the param header needed to put the cookie in the INIT ACK. 15981da177e4SLinus Torvalds */ 1599f48ef4c7SXin Long static struct sctp_cookie_param *sctp_pack_cookie( 1600f48ef4c7SXin Long const struct sctp_endpoint *ep, 16011da177e4SLinus Torvalds const struct sctp_association *asoc, 16021da177e4SLinus Torvalds const struct sctp_chunk *init_chunk, 1603327c0dabSXin Long int *cookie_len, const __u8 *raw_addrs, 1604327c0dabSXin Long int addrs_len) 16051da177e4SLinus Torvalds { 16061da177e4SLinus Torvalds struct sctp_signed_cookie *cookie; 1607f48ef4c7SXin Long struct sctp_cookie_param *retval; 16081da177e4SLinus Torvalds int headersize, bodysize; 16091da177e4SLinus Torvalds 16109834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 16119834a2bbSVlad Yasevich * any padding. 16129834a2bbSVlad Yasevich */ 16133c918704SXin Long headersize = sizeof(struct sctp_paramhdr) + 16149834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 16159834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 16161da177e4SLinus Torvalds bodysize = sizeof(struct sctp_cookie) 16171da177e4SLinus Torvalds + ntohs(init_chunk->chunk_hdr->length) + addrs_len; 16181da177e4SLinus Torvalds 16191da177e4SLinus Torvalds /* Pad out the cookie to a multiple to make the signature 16201da177e4SLinus Torvalds * functions simpler to write. 16211da177e4SLinus Torvalds */ 16221da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 16231da177e4SLinus Torvalds bodysize += SCTP_COOKIE_MULTIPLE 16241da177e4SLinus Torvalds - (bodysize % SCTP_COOKIE_MULTIPLE); 16251da177e4SLinus Torvalds *cookie_len = headersize + bodysize; 16261da177e4SLinus Torvalds 16271da177e4SLinus Torvalds /* Clear this memory since we are sending this data structure 16281da177e4SLinus Torvalds * out on the network. 16291da177e4SLinus Torvalds */ 1630af997d8cSArnaldo Carvalho de Melo retval = kzalloc(*cookie_len, GFP_ATOMIC); 1631af997d8cSArnaldo Carvalho de Melo if (!retval) 1632af997d8cSArnaldo Carvalho de Melo goto nodata; 1633af997d8cSArnaldo Carvalho de Melo 16341da177e4SLinus Torvalds cookie = (struct sctp_signed_cookie *) retval->body; 16351da177e4SLinus Torvalds 16361da177e4SLinus Torvalds /* Set up the parameter header. */ 16371da177e4SLinus Torvalds retval->p.type = SCTP_PARAM_STATE_COOKIE; 16381da177e4SLinus Torvalds retval->p.length = htons(*cookie_len); 16391da177e4SLinus Torvalds 16401da177e4SLinus Torvalds /* Copy the cookie part of the association itself. */ 16411da177e4SLinus Torvalds cookie->c = asoc->c; 16421da177e4SLinus Torvalds /* Save the raw address list length in the cookie. */ 16431da177e4SLinus Torvalds cookie->c.raw_addr_list_len = addrs_len; 16441da177e4SLinus Torvalds 16451da177e4SLinus Torvalds /* Remember PR-SCTP capability. */ 16461da177e4SLinus Torvalds cookie->c.prsctp_capable = asoc->peer.prsctp_capable; 16471da177e4SLinus Torvalds 16480f3fffd8SIvan Skytte Jorgensen /* Save adaptation indication in the cookie. */ 16490f3fffd8SIvan Skytte Jorgensen cookie->c.adaptation_ind = asoc->peer.adaptation_ind; 16501da177e4SLinus Torvalds 16511da177e4SLinus Torvalds /* Set an expiration time for the cookie. */ 165252db882fSDaniel Borkmann cookie->c.expiration = ktime_add(asoc->cookie_life, 1653cb5e173eSMarcelo Ricardo Leitner ktime_get_real()); 16541da177e4SLinus Torvalds 16551da177e4SLinus Torvalds /* Copy the peer's init packet. */ 16561da177e4SLinus Torvalds memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr, 16571da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length)); 16581da177e4SLinus Torvalds 16591da177e4SLinus Torvalds /* Copy the raw local address list of the association. */ 16601da177e4SLinus Torvalds memcpy((__u8 *)&cookie->c.peer_init[0] + 16611da177e4SLinus Torvalds ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len); 16621da177e4SLinus Torvalds 16631da177e4SLinus Torvalds if (sctp_sk(ep->base.sk)->hmac) { 16645821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 16655821c769SHerbert Xu int err; 16661b489e11SHerbert Xu 16671da177e4SLinus Torvalds /* Sign the message. */ 16685821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 16695821c769SHerbert Xu desc->flags = 0; 16701da177e4SLinus Torvalds 16715821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 16725821c769SHerbert Xu sizeof(ep->secret_key)) ?: 16735821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize, 16745821c769SHerbert Xu cookie->signature); 16755821c769SHerbert Xu shash_desc_zero(desc); 16765821c769SHerbert Xu if (err) 16771b489e11SHerbert Xu goto free_cookie; 16781da177e4SLinus Torvalds } 16791da177e4SLinus Torvalds 16801da177e4SLinus Torvalds return retval; 16811b489e11SHerbert Xu 16821b489e11SHerbert Xu free_cookie: 16831b489e11SHerbert Xu kfree(retval); 16841b489e11SHerbert Xu nodata: 16851b489e11SHerbert Xu *cookie_len = 0; 16861b489e11SHerbert Xu return NULL; 16871da177e4SLinus Torvalds } 16881da177e4SLinus Torvalds 16891da177e4SLinus Torvalds /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */ 16901da177e4SLinus Torvalds struct sctp_association *sctp_unpack_cookie( 16911da177e4SLinus Torvalds const struct sctp_endpoint *ep, 16921da177e4SLinus Torvalds const struct sctp_association *asoc, 1693dd0fc66fSAl Viro struct sctp_chunk *chunk, gfp_t gfp, 16941da177e4SLinus Torvalds int *error, struct sctp_chunk **errp) 16951da177e4SLinus Torvalds { 16961da177e4SLinus Torvalds struct sctp_association *retval = NULL; 16971da177e4SLinus Torvalds int headersize, bodysize, fixed_size; 1698327c0dabSXin Long struct sctp_signed_cookie *cookie; 16991da177e4SLinus Torvalds struct sk_buff *skb = chunk->skb; 1700327c0dabSXin Long struct sctp_cookie *bear_cookie; 1701327c0dabSXin Long __u8 *digest = ep->digest; 1702327c0dabSXin Long enum sctp_scope scope; 1703327c0dabSXin Long unsigned int len; 170452db882fSDaniel Borkmann ktime_t kt; 17051da177e4SLinus Torvalds 17069834a2bbSVlad Yasevich /* Header size is static data prior to the actual cookie, including 17079834a2bbSVlad Yasevich * any padding. 17089834a2bbSVlad Yasevich */ 1709922dbc5bSXin Long headersize = sizeof(struct sctp_chunkhdr) + 17109834a2bbSVlad Yasevich (sizeof(struct sctp_signed_cookie) - 17119834a2bbSVlad Yasevich sizeof(struct sctp_cookie)); 17121da177e4SLinus Torvalds bodysize = ntohs(chunk->chunk_hdr->length) - headersize; 17131da177e4SLinus Torvalds fixed_size = headersize + sizeof(struct sctp_cookie); 17141da177e4SLinus Torvalds 17151da177e4SLinus Torvalds /* Verify that the chunk looks like it even has a cookie. 17161da177e4SLinus Torvalds * There must be enough room for our cookie and our peer's 17171da177e4SLinus Torvalds * INIT chunk. 17181da177e4SLinus Torvalds */ 17191da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 17201da177e4SLinus Torvalds if (len < fixed_size + sizeof(struct sctp_chunkhdr)) 17211da177e4SLinus Torvalds goto malformed; 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds /* Verify that the cookie has been padded out. */ 17241da177e4SLinus Torvalds if (bodysize % SCTP_COOKIE_MULTIPLE) 17251da177e4SLinus Torvalds goto malformed; 17261da177e4SLinus Torvalds 17271da177e4SLinus Torvalds /* Process the cookie. */ 17281da177e4SLinus Torvalds cookie = chunk->subh.cookie_hdr; 17291da177e4SLinus Torvalds bear_cookie = &cookie->c; 17301da177e4SLinus Torvalds 17311da177e4SLinus Torvalds if (!sctp_sk(ep->base.sk)->hmac) 17321da177e4SLinus Torvalds goto no_hmac; 17331da177e4SLinus Torvalds 17341da177e4SLinus Torvalds /* Check the signature. */ 17355821c769SHerbert Xu { 17365821c769SHerbert Xu SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac); 17375821c769SHerbert Xu int err; 17381da177e4SLinus Torvalds 17395821c769SHerbert Xu desc->tfm = sctp_sk(ep->base.sk)->hmac; 17405821c769SHerbert Xu desc->flags = 0; 17415821c769SHerbert Xu 17425821c769SHerbert Xu err = crypto_shash_setkey(desc->tfm, ep->secret_key, 17435821c769SHerbert Xu sizeof(ep->secret_key)) ?: 17445821c769SHerbert Xu crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize, 17455821c769SHerbert Xu digest); 17465821c769SHerbert Xu shash_desc_zero(desc); 17475821c769SHerbert Xu 17485821c769SHerbert Xu if (err) { 17491b489e11SHerbert Xu *error = -SCTP_IERROR_NOMEM; 17501b489e11SHerbert Xu goto fail; 17511b489e11SHerbert Xu } 17525821c769SHerbert Xu } 17531da177e4SLinus Torvalds 17541da177e4SLinus Torvalds if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) { 17551da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_SIG; 17561da177e4SLinus Torvalds goto fail; 17571da177e4SLinus Torvalds } 17581da177e4SLinus Torvalds 17591da177e4SLinus Torvalds no_hmac: 17601da177e4SLinus Torvalds /* IG Section 2.35.2: 17611da177e4SLinus Torvalds * 3) Compare the port numbers and the verification tag contained 17621da177e4SLinus Torvalds * within the COOKIE ECHO chunk to the actual port numbers and the 17631da177e4SLinus Torvalds * verification tag within the SCTP common header of the received 17641da177e4SLinus Torvalds * packet. If these values do not match the packet MUST be silently 17651da177e4SLinus Torvalds * discarded, 17661da177e4SLinus Torvalds */ 17671da177e4SLinus Torvalds if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) { 17681da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_TAG; 17691da177e4SLinus Torvalds goto fail; 17701da177e4SLinus Torvalds } 17711da177e4SLinus Torvalds 17729b1dfad0SAl Viro if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port || 17731da177e4SLinus Torvalds ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) { 17741da177e4SLinus Torvalds *error = -SCTP_IERROR_BAD_PORTS; 17751da177e4SLinus Torvalds goto fail; 17761da177e4SLinus Torvalds } 17771da177e4SLinus Torvalds 17781da177e4SLinus Torvalds /* Check to see if the cookie is stale. If there is already 17791da177e4SLinus Torvalds * an association, there is no need to check cookie's expiration 17801da177e4SLinus Torvalds * for init collision case of lost COOKIE ACK. 1781f236218bSVlad Yasevich * If skb has been timestamped, then use the stamp, otherwise 1782f236218bSVlad Yasevich * use current time. This introduces a small possibility that 1783f236218bSVlad Yasevich * that a cookie may be considered expired, but his would only slow 1784f236218bSVlad Yasevich * down the new association establishment instead of every packet. 17851da177e4SLinus Torvalds */ 1786f236218bSVlad Yasevich if (sock_flag(ep->base.sk, SOCK_TIMESTAMP)) 178752db882fSDaniel Borkmann kt = skb_get_ktime(skb); 1788f236218bSVlad Yasevich else 1789cb5e173eSMarcelo Ricardo Leitner kt = ktime_get_real(); 1790f236218bSVlad Yasevich 179167cb9366SDaniel Borkmann if (!asoc && ktime_before(bear_cookie->expiration, kt)) { 17921da177e4SLinus Torvalds /* 17931da177e4SLinus Torvalds * Section 3.3.10.3 Stale Cookie Error (3) 17941da177e4SLinus Torvalds * 17951da177e4SLinus Torvalds * Cause of error 17961da177e4SLinus Torvalds * --------------- 17971da177e4SLinus Torvalds * Stale Cookie Error: Indicates the receipt of a valid State 17981da177e4SLinus Torvalds * Cookie that has expired. 17991da177e4SLinus Torvalds */ 18001da177e4SLinus Torvalds len = ntohs(chunk->chunk_hdr->length); 18011da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18021da177e4SLinus Torvalds if (*errp) { 180352db882fSDaniel Borkmann suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration)); 180434bcca28SAl Viro __be32 n = htonl(usecs); 18051da177e4SLinus Torvalds 18061da177e4SLinus Torvalds sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE, 180700f1c2dfSWei Yongjun sizeof(n)); 180800f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(n), &n); 18091da177e4SLinus Torvalds *error = -SCTP_IERROR_STALE_COOKIE; 18101da177e4SLinus Torvalds } else 18111da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18121da177e4SLinus Torvalds 18131da177e4SLinus Torvalds goto fail; 18141da177e4SLinus Torvalds } 18151da177e4SLinus Torvalds 18161da177e4SLinus Torvalds /* Make a new base association. */ 18171da177e4SLinus Torvalds scope = sctp_scope(sctp_source(chunk)); 18181da177e4SLinus Torvalds retval = sctp_association_new(ep, ep->base.sk, scope, gfp); 18191da177e4SLinus Torvalds if (!retval) { 18201da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18211da177e4SLinus Torvalds goto fail; 18221da177e4SLinus Torvalds } 18231da177e4SLinus Torvalds 18241da177e4SLinus Torvalds /* Set up our peer's port number. */ 18251da177e4SLinus Torvalds retval->peer.port = ntohs(chunk->sctp_hdr->source); 18261da177e4SLinus Torvalds 18271da177e4SLinus Torvalds /* Populate the association from the cookie. */ 18281da177e4SLinus Torvalds memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie)); 18291da177e4SLinus Torvalds 18301da177e4SLinus Torvalds if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie, 18311da177e4SLinus Torvalds GFP_ATOMIC) < 0) { 18321da177e4SLinus Torvalds *error = -SCTP_IERROR_NOMEM; 18331da177e4SLinus Torvalds goto fail; 18341da177e4SLinus Torvalds } 18351da177e4SLinus Torvalds 18361da177e4SLinus Torvalds /* Also, add the destination address. */ 18371da177e4SLinus Torvalds if (list_empty(&retval->base.bind_addr.address_list)) { 1838f57d96b2SVlad Yasevich sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest, 1839133800d1SMarcelo Ricardo Leitner sizeof(chunk->dest), SCTP_ADDR_SRC, 1840133800d1SMarcelo Ricardo Leitner GFP_ATOMIC); 18411da177e4SLinus Torvalds } 18421da177e4SLinus Torvalds 18431da177e4SLinus Torvalds retval->next_tsn = retval->c.initial_tsn; 18441da177e4SLinus Torvalds retval->ctsn_ack_point = retval->next_tsn - 1; 18451da177e4SLinus Torvalds retval->addip_serial = retval->c.initial_tsn; 1846cc16f00fSXin Long retval->strreset_outseq = retval->c.initial_tsn; 18471da177e4SLinus Torvalds retval->adv_peer_ack_point = retval->ctsn_ack_point; 18481da177e4SLinus Torvalds retval->peer.prsctp_capable = retval->c.prsctp_capable; 18490f3fffd8SIvan Skytte Jorgensen retval->peer.adaptation_ind = retval->c.adaptation_ind; 18501da177e4SLinus Torvalds 18511da177e4SLinus Torvalds /* The INIT stuff will be done by the side effects. */ 18521da177e4SLinus Torvalds return retval; 18531da177e4SLinus Torvalds 18541da177e4SLinus Torvalds fail: 18551da177e4SLinus Torvalds if (retval) 18561da177e4SLinus Torvalds sctp_association_free(retval); 18571da177e4SLinus Torvalds 18581da177e4SLinus Torvalds return NULL; 18591da177e4SLinus Torvalds 18601da177e4SLinus Torvalds malformed: 18611da177e4SLinus Torvalds /* Yikes! The packet is either corrupt or deliberately 18621da177e4SLinus Torvalds * malformed. 18631da177e4SLinus Torvalds */ 18641da177e4SLinus Torvalds *error = -SCTP_IERROR_MALFORMED; 18651da177e4SLinus Torvalds goto fail; 18661da177e4SLinus Torvalds } 18671da177e4SLinus Torvalds 18681da177e4SLinus Torvalds /******************************************************************** 18691da177e4SLinus Torvalds * 3rd Level Abstractions 18701da177e4SLinus Torvalds ********************************************************************/ 18711da177e4SLinus Torvalds 18721da177e4SLinus Torvalds struct __sctp_missing { 18739f81bcd9SAl Viro __be32 num_missing; 18749f81bcd9SAl Viro __be16 type; 1875bc10502dSEric Dumazet } __packed; 18761da177e4SLinus Torvalds 18771da177e4SLinus Torvalds /* 18781da177e4SLinus Torvalds * Report a missing mandatory parameter. 18791da177e4SLinus Torvalds */ 18801da177e4SLinus Torvalds static int sctp_process_missing_param(const struct sctp_association *asoc, 188134b4e29bSXin Long enum sctp_param paramtype, 18821da177e4SLinus Torvalds struct sctp_chunk *chunk, 18831da177e4SLinus Torvalds struct sctp_chunk **errp) 18841da177e4SLinus Torvalds { 18851da177e4SLinus Torvalds struct __sctp_missing report; 18861da177e4SLinus Torvalds __u16 len; 18871da177e4SLinus Torvalds 1888e2f036a9SMarcelo Ricardo Leitner len = SCTP_PAD4(sizeof(report)); 18891da177e4SLinus Torvalds 18901da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 18911da177e4SLinus Torvalds * returning multiple unknown parameters. 18921da177e4SLinus Torvalds */ 18931da177e4SLinus Torvalds if (!*errp) 18941da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 18951da177e4SLinus Torvalds 18961da177e4SLinus Torvalds if (*errp) { 18971da177e4SLinus Torvalds report.num_missing = htonl(1); 18981da177e4SLinus Torvalds report.type = paramtype; 1899ebdfcad4SVlad Yasevich sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM, 190000f1c2dfSWei Yongjun sizeof(report)); 190100f1c2dfSWei Yongjun sctp_addto_chunk(*errp, sizeof(report), &report); 19021da177e4SLinus Torvalds } 19031da177e4SLinus Torvalds 19041da177e4SLinus Torvalds /* Stop processing this chunk. */ 19051da177e4SLinus Torvalds return 0; 19061da177e4SLinus Torvalds } 19071da177e4SLinus Torvalds 19081da177e4SLinus Torvalds /* Report an Invalid Mandatory Parameter. */ 19091da177e4SLinus Torvalds static int sctp_process_inv_mandatory(const struct sctp_association *asoc, 19101da177e4SLinus Torvalds struct sctp_chunk *chunk, 19111da177e4SLinus Torvalds struct sctp_chunk **errp) 19121da177e4SLinus Torvalds { 19131da177e4SLinus Torvalds /* Invalid Mandatory Parameter Error has no payload. */ 19141da177e4SLinus Torvalds 19151da177e4SLinus Torvalds if (!*errp) 19161da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, 0); 19171da177e4SLinus Torvalds 19181da177e4SLinus Torvalds if (*errp) 191900f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0); 19201da177e4SLinus Torvalds 19211da177e4SLinus Torvalds /* Stop processing this chunk. */ 19221da177e4SLinus Torvalds return 0; 19231da177e4SLinus Torvalds } 19241da177e4SLinus Torvalds 19251da177e4SLinus Torvalds static int sctp_process_inv_paramlength(const struct sctp_association *asoc, 19261da177e4SLinus Torvalds struct sctp_paramhdr *param, 19271da177e4SLinus Torvalds const struct sctp_chunk *chunk, 19281da177e4SLinus Torvalds struct sctp_chunk **errp) 19291da177e4SLinus Torvalds { 19307ab90804SVlad Yasevich /* This is a fatal error. Any accumulated non-fatal errors are 19317ab90804SVlad Yasevich * not reported. 19327ab90804SVlad Yasevich */ 19337ab90804SVlad Yasevich if (*errp) 19347ab90804SVlad Yasevich sctp_chunk_free(*errp); 19357ab90804SVlad Yasevich 19361da177e4SLinus Torvalds /* Create an error chunk and fill it in with our payload. */ 1937ba016670SWei Yongjun *errp = sctp_make_violation_paramlen(asoc, chunk, param); 19381da177e4SLinus Torvalds 19391da177e4SLinus Torvalds return 0; 19401da177e4SLinus Torvalds } 19411da177e4SLinus Torvalds 19421da177e4SLinus Torvalds 19431da177e4SLinus Torvalds /* Do not attempt to handle the HOST_NAME parm. However, do 19441da177e4SLinus Torvalds * send back an indicator to the peer. 19451da177e4SLinus Torvalds */ 19461da177e4SLinus Torvalds static int sctp_process_hn_param(const struct sctp_association *asoc, 19471da177e4SLinus Torvalds union sctp_params param, 19481da177e4SLinus Torvalds struct sctp_chunk *chunk, 19491da177e4SLinus Torvalds struct sctp_chunk **errp) 19501da177e4SLinus Torvalds { 19511da177e4SLinus Torvalds __u16 len = ntohs(param.p->length); 19521da177e4SLinus Torvalds 19537ab90804SVlad Yasevich /* Processing of the HOST_NAME parameter will generate an 19547ab90804SVlad Yasevich * ABORT. If we've accumulated any non-fatal errors, they 19557ab90804SVlad Yasevich * would be unrecognized parameters and we should not include 19567ab90804SVlad Yasevich * them in the ABORT. 19577ab90804SVlad Yasevich */ 19587ab90804SVlad Yasevich if (*errp) 19597ab90804SVlad Yasevich sctp_chunk_free(*errp); 19607ab90804SVlad Yasevich 19611da177e4SLinus Torvalds *errp = sctp_make_op_error_space(asoc, chunk, len); 19621da177e4SLinus Torvalds 196300f1c2dfSWei Yongjun if (*errp) { 196400f1c2dfSWei Yongjun sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len); 196500f1c2dfSWei Yongjun sctp_addto_chunk(*errp, len, param.v); 196600f1c2dfSWei Yongjun } 19671da177e4SLinus Torvalds 19681da177e4SLinus Torvalds /* Stop processing this chunk. */ 19691da177e4SLinus Torvalds return 0; 19701da177e4SLinus Torvalds } 19711da177e4SLinus Torvalds 1972f53b5b09SEric W. Biederman static int sctp_verify_ext_param(struct net *net, union sctp_params param) 1973d6701191SVlad Yasevich { 19743c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 1975d6701191SVlad Yasevich int have_asconf = 0; 1976327c0dabSXin Long int have_auth = 0; 1977d6701191SVlad Yasevich int i; 1978d6701191SVlad Yasevich 1979d6701191SVlad Yasevich for (i = 0; i < num_ext; i++) { 1980d6701191SVlad Yasevich switch (param.ext->chunks[i]) { 1981d6701191SVlad Yasevich case SCTP_CID_AUTH: 1982d6701191SVlad Yasevich have_auth = 1; 1983d6701191SVlad Yasevich break; 1984d6701191SVlad Yasevich case SCTP_CID_ASCONF: 1985d6701191SVlad Yasevich case SCTP_CID_ASCONF_ACK: 1986d6701191SVlad Yasevich have_asconf = 1; 1987d6701191SVlad Yasevich break; 1988d6701191SVlad Yasevich } 1989d6701191SVlad Yasevich } 1990d6701191SVlad Yasevich 1991d6701191SVlad Yasevich /* ADD-IP Security: The draft requires us to ABORT or ignore the 1992d6701191SVlad Yasevich * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this 1993d6701191SVlad Yasevich * only if ADD-IP is turned on and we are not backward-compatible 1994d6701191SVlad Yasevich * mode. 1995d6701191SVlad Yasevich */ 1996e1fc3b14SEric W. Biederman if (net->sctp.addip_noauth) 1997d6701191SVlad Yasevich return 1; 1998d6701191SVlad Yasevich 1999e1fc3b14SEric W. Biederman if (net->sctp.addip_enable && !have_auth && have_asconf) 2000d6701191SVlad Yasevich return 0; 2001d6701191SVlad Yasevich 2002d6701191SVlad Yasevich return 1; 2003d6701191SVlad Yasevich } 2004d6701191SVlad Yasevich 2005131a47e3SVlad Yasevich static void sctp_process_ext_param(struct sctp_association *asoc, 2006131a47e3SVlad Yasevich union sctp_params param) 2007131a47e3SVlad Yasevich { 20083c918704SXin Long __u16 num_ext = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 2009327c0dabSXin Long struct net *net = sock_net(asoc->base.sk); 2010131a47e3SVlad Yasevich int i; 2011131a47e3SVlad Yasevich 2012131a47e3SVlad Yasevich for (i = 0; i < num_ext; i++) { 2013131a47e3SVlad Yasevich switch (param.ext->chunks[i]) { 2014c28445c3SXin Long case SCTP_CID_RECONF: 2015c28445c3SXin Long if (asoc->reconf_enable && 2016c28445c3SXin Long !asoc->peer.reconf_capable) 2017c28445c3SXin Long asoc->peer.reconf_capable = 1; 2018c28445c3SXin Long break; 2019131a47e3SVlad Yasevich case SCTP_CID_FWD_TSN: 202028aa4c26SXin Long if (asoc->prsctp_enable && !asoc->peer.prsctp_capable) 2021131a47e3SVlad Yasevich asoc->peer.prsctp_capable = 1; 2022131a47e3SVlad Yasevich break; 2023730fc3d0SVlad Yasevich case SCTP_CID_AUTH: 2024730fc3d0SVlad Yasevich /* if the peer reports AUTH, assume that he 2025730fc3d0SVlad Yasevich * supports AUTH. 2026730fc3d0SVlad Yasevich */ 2027b14878ccSVlad Yasevich if (asoc->ep->auth_enable) 2028730fc3d0SVlad Yasevich asoc->peer.auth_capable = 1; 2029730fc3d0SVlad Yasevich break; 2030131a47e3SVlad Yasevich case SCTP_CID_ASCONF: 2031131a47e3SVlad Yasevich case SCTP_CID_ASCONF_ACK: 2032e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 203388799fe5SVlad Yasevich asoc->peer.asconf_capable = 1; 20346b2f9cb6SVlad Yasevich break; 2035131a47e3SVlad Yasevich default: 2036131a47e3SVlad Yasevich break; 2037131a47e3SVlad Yasevich } 2038131a47e3SVlad Yasevich } 2039131a47e3SVlad Yasevich } 2040131a47e3SVlad Yasevich 20411da177e4SLinus Torvalds /* RFC 3.2.1 & the Implementers Guide 2.2. 20421da177e4SLinus Torvalds * 20431da177e4SLinus Torvalds * The Parameter Types are encoded such that the 20441da177e4SLinus Torvalds * highest-order two bits specify the action that must be 20451da177e4SLinus Torvalds * taken if the processing endpoint does not recognize the 20461da177e4SLinus Torvalds * Parameter Type. 20471da177e4SLinus Torvalds * 20487ab90804SVlad Yasevich * 00 - Stop processing this parameter; do not process any further 20497ab90804SVlad Yasevich * parameters within this chunk 20501da177e4SLinus Torvalds * 20517ab90804SVlad Yasevich * 01 - Stop processing this parameter, do not process any further 20527ab90804SVlad Yasevich * parameters within this chunk, and report the unrecognized 20537ab90804SVlad Yasevich * parameter in an 'Unrecognized Parameter' ERROR chunk. 20541da177e4SLinus Torvalds * 20551da177e4SLinus Torvalds * 10 - Skip this parameter and continue processing. 20561da177e4SLinus Torvalds * 20571da177e4SLinus Torvalds * 11 - Skip this parameter and continue processing but 20581da177e4SLinus Torvalds * report the unrecognized parameter in an 20597ab90804SVlad Yasevich * 'Unrecognized Parameter' ERROR chunk. 20601da177e4SLinus Torvalds * 20611da177e4SLinus Torvalds * Return value: 20627ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 20637ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop and report an error. 20647ab90804SVlad Yasevich * SCTP_IERROR_NOMEME - out of memory. 20651da177e4SLinus Torvalds */ 20664785c7aeSXin Long static enum sctp_ierror sctp_process_unk_param( 20674785c7aeSXin Long const struct sctp_association *asoc, 20681da177e4SLinus Torvalds union sctp_params param, 20691da177e4SLinus Torvalds struct sctp_chunk *chunk, 20701da177e4SLinus Torvalds struct sctp_chunk **errp) 20711da177e4SLinus Torvalds { 20727ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 20731da177e4SLinus Torvalds 20741da177e4SLinus Torvalds switch (param.p->type & SCTP_PARAM_ACTION_MASK) { 20751da177e4SLinus Torvalds case SCTP_PARAM_ACTION_DISCARD: 20767ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20771da177e4SLinus Torvalds break; 20781da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP: 20791da177e4SLinus Torvalds break; 20807ab90804SVlad Yasevich case SCTP_PARAM_ACTION_DISCARD_ERR: 20817ab90804SVlad Yasevich retval = SCTP_IERROR_ERROR; 20827ab90804SVlad Yasevich /* Fall through */ 20831da177e4SLinus Torvalds case SCTP_PARAM_ACTION_SKIP_ERR: 20841da177e4SLinus Torvalds /* Make an ERROR chunk, preparing enough room for 20851da177e4SLinus Torvalds * returning multiple unknown parameters. 20861da177e4SLinus Torvalds */ 20871da177e4SLinus Torvalds if (NULL == *errp) 20885fa782c2SNeil Horman *errp = sctp_make_op_error_fixed(asoc, chunk); 20891da177e4SLinus Torvalds 20901da177e4SLinus Torvalds if (*errp) { 20912205a6eaSJiri Bohac if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM, 2092e2f036a9SMarcelo Ricardo Leitner SCTP_PAD4(ntohs(param.p->length)))) 20935fa782c2SNeil Horman sctp_addto_chunk_fixed(*errp, 2094e2f036a9SMarcelo Ricardo Leitner SCTP_PAD4(ntohs(param.p->length)), 209500f1c2dfSWei Yongjun param.v); 20961da177e4SLinus Torvalds } else { 20971da177e4SLinus Torvalds /* If there is no memory for generating the ERROR 20981da177e4SLinus Torvalds * report as specified, an ABORT will be triggered 20991da177e4SLinus Torvalds * to the peer and the association won't be 21001da177e4SLinus Torvalds * established. 21011da177e4SLinus Torvalds */ 21027ab90804SVlad Yasevich retval = SCTP_IERROR_NOMEM; 21031da177e4SLinus Torvalds } 21041da177e4SLinus Torvalds break; 21051da177e4SLinus Torvalds default: 21061da177e4SLinus Torvalds break; 21071da177e4SLinus Torvalds } 21081da177e4SLinus Torvalds 21091da177e4SLinus Torvalds return retval; 21101da177e4SLinus Torvalds } 21111da177e4SLinus Torvalds 21127ab90804SVlad Yasevich /* Verify variable length parameters 21131da177e4SLinus Torvalds * Return values: 21147ab90804SVlad Yasevich * SCTP_IERROR_ABORT - trigger an ABORT 21157ab90804SVlad Yasevich * SCTP_IERROR_NOMEM - out of memory (abort) 21167ab90804SVlad Yasevich * SCTP_IERROR_ERROR - stop processing, trigger an ERROR 21177ab90804SVlad Yasevich * SCTP_IERROR_NO_ERROR - continue with the chunk 21181da177e4SLinus Torvalds */ 21194785c7aeSXin Long static enum sctp_ierror sctp_verify_param(struct net *net, 2120b14878ccSVlad Yasevich const struct sctp_endpoint *ep, 2121f53b5b09SEric W. Biederman const struct sctp_association *asoc, 21221da177e4SLinus Torvalds union sctp_params param, 21236d85e68fSXin Long enum sctp_cid cid, 21241da177e4SLinus Torvalds struct sctp_chunk *chunk, 21251da177e4SLinus Torvalds struct sctp_chunk **err_chunk) 21261da177e4SLinus Torvalds { 212772da7b38SWei Yongjun struct sctp_hmac_algo_param *hmacs; 21287ab90804SVlad Yasevich int retval = SCTP_IERROR_NO_ERROR; 212972da7b38SWei Yongjun __u16 n_elt, id = 0; 213072da7b38SWei Yongjun int i; 21311da177e4SLinus Torvalds 21321da177e4SLinus Torvalds /* FIXME - This routine is not looking at each parameter per the 21331da177e4SLinus Torvalds * chunk type, i.e., unrecognized parameters should be further 21341da177e4SLinus Torvalds * identified based on the chunk id. 21351da177e4SLinus Torvalds */ 21361da177e4SLinus Torvalds 21371da177e4SLinus Torvalds switch (param.p->type) { 21381da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 21391da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 21401da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 21411da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 21421da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 21431da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 21441da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 21451da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 21460f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2147d6701191SVlad Yasevich break; 2148d6701191SVlad Yasevich 2149131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2150f53b5b09SEric W. Biederman if (!sctp_verify_ext_param(net, param)) 2151d6701191SVlad Yasevich return SCTP_IERROR_ABORT; 21521da177e4SLinus Torvalds break; 21531da177e4SLinus Torvalds 2154d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2155e1fc3b14SEric W. Biederman if (net->sctp.addip_enable) 2156d6de3097SVlad Yasevich break; 2157d6de3097SVlad Yasevich goto fallthrough; 2158d6de3097SVlad Yasevich 21591da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 21601da177e4SLinus Torvalds /* Tell the peer, we won't support this param. */ 21617ab90804SVlad Yasevich sctp_process_hn_param(asoc, param, chunk, err_chunk); 21627ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21637ab90804SVlad Yasevich break; 2164131a47e3SVlad Yasevich 21651da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 216628aa4c26SXin Long if (ep->prsctp_enable) 21671da177e4SLinus Torvalds break; 2168730fc3d0SVlad Yasevich goto fallthrough; 2169730fc3d0SVlad Yasevich 2170730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2171b14878ccSVlad Yasevich if (!ep->auth_enable) 2172730fc3d0SVlad Yasevich goto fallthrough; 2173730fc3d0SVlad Yasevich 2174730fc3d0SVlad Yasevich /* SCTP-AUTH: Secion 6.1 2175730fc3d0SVlad Yasevich * If the random number is not 32 byte long the association 2176730fc3d0SVlad Yasevich * MUST be aborted. The ABORT chunk SHOULD contain the error 2177730fc3d0SVlad Yasevich * cause 'Protocol Violation'. 2178730fc3d0SVlad Yasevich */ 2179730fc3d0SVlad Yasevich if (SCTP_AUTH_RANDOM_LENGTH != 21803c918704SXin Long ntohs(param.p->length) - sizeof(struct sctp_paramhdr)) { 21817ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2182730fc3d0SVlad Yasevich chunk, err_chunk); 21837ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 21847ab90804SVlad Yasevich } 2185730fc3d0SVlad Yasevich break; 2186730fc3d0SVlad Yasevich 2187730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2188b14878ccSVlad Yasevich if (!ep->auth_enable) 2189730fc3d0SVlad Yasevich goto fallthrough; 2190730fc3d0SVlad Yasevich 2191730fc3d0SVlad Yasevich /* SCTP-AUTH: Section 3.2 2192730fc3d0SVlad Yasevich * The CHUNKS parameter MUST be included once in the INIT or 2193730fc3d0SVlad Yasevich * INIT-ACK chunk if the sender wants to receive authenticated 2194730fc3d0SVlad Yasevich * chunks. Its maximum length is 260 bytes. 2195730fc3d0SVlad Yasevich */ 21967ab90804SVlad Yasevich if (260 < ntohs(param.p->length)) { 21977ab90804SVlad Yasevich sctp_process_inv_paramlength(asoc, param.p, 2198730fc3d0SVlad Yasevich chunk, err_chunk); 21997ab90804SVlad Yasevich retval = SCTP_IERROR_ABORT; 22007ab90804SVlad Yasevich } 2201730fc3d0SVlad Yasevich break; 2202730fc3d0SVlad Yasevich 2203730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2204b14878ccSVlad Yasevich if (!ep->auth_enable) 220572da7b38SWei Yongjun goto fallthrough; 220672da7b38SWei Yongjun 220772da7b38SWei Yongjun hmacs = (struct sctp_hmac_algo_param *)param.p; 22083c918704SXin Long n_elt = (ntohs(param.p->length) - 22093c918704SXin Long sizeof(struct sctp_paramhdr)) >> 1; 221072da7b38SWei Yongjun 221172da7b38SWei Yongjun /* SCTP-AUTH: Section 6.1 221272da7b38SWei Yongjun * The HMAC algorithm based on SHA-1 MUST be supported and 221372da7b38SWei Yongjun * included in the HMAC-ALGO parameter. 221472da7b38SWei Yongjun */ 221572da7b38SWei Yongjun for (i = 0; i < n_elt; i++) { 221672da7b38SWei Yongjun id = ntohs(hmacs->hmac_ids[i]); 221772da7b38SWei Yongjun 221872da7b38SWei Yongjun if (id == SCTP_AUTH_HMAC_ID_SHA1) 2219730fc3d0SVlad Yasevich break; 222072da7b38SWei Yongjun } 222172da7b38SWei Yongjun 222272da7b38SWei Yongjun if (id != SCTP_AUTH_HMAC_ID_SHA1) { 222372da7b38SWei Yongjun sctp_process_inv_paramlength(asoc, param.p, chunk, 222472da7b38SWei Yongjun err_chunk); 222572da7b38SWei Yongjun retval = SCTP_IERROR_ABORT; 222672da7b38SWei Yongjun } 222772da7b38SWei Yongjun break; 2228730fc3d0SVlad Yasevich fallthrough: 22291da177e4SLinus Torvalds default: 2230bb33381dSDaniel Borkmann pr_debug("%s: unrecognized param:%d for chunk:%d\n", 2231bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), cid); 2232bb33381dSDaniel Borkmann 22337ab90804SVlad Yasevich retval = sctp_process_unk_param(asoc, param, chunk, err_chunk); 22341da177e4SLinus Torvalds break; 22351da177e4SLinus Torvalds } 22361da177e4SLinus Torvalds return retval; 22371da177e4SLinus Torvalds } 22381da177e4SLinus Torvalds 22391da177e4SLinus Torvalds /* Verify the INIT packet before we process it. */ 2240b14878ccSVlad Yasevich int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep, 22416d85e68fSXin Long const struct sctp_association *asoc, enum sctp_cid cid, 224201a992beSXin Long struct sctp_init_chunk *peer_init, 224301a992beSXin Long struct sctp_chunk *chunk, struct sctp_chunk **errp) 22441da177e4SLinus Torvalds { 22451da177e4SLinus Torvalds union sctp_params param; 22467613f5feSDaniel Borkmann bool has_cookie = false; 22477ab90804SVlad Yasevich int result; 22481da177e4SLinus Torvalds 22497613f5feSDaniel Borkmann /* Check for missing mandatory parameters. Note: Initial TSN is 22507613f5feSDaniel Borkmann * also mandatory, but is not checked here since the valid range 22517613f5feSDaniel Borkmann * is 0..2**32-1. RFC4960, section 3.3.3. 22527613f5feSDaniel Borkmann */ 22537613f5feSDaniel Borkmann if (peer_init->init_hdr.num_outbound_streams == 0 || 22547613f5feSDaniel Borkmann peer_init->init_hdr.num_inbound_streams == 0 || 22557613f5feSDaniel Borkmann peer_init->init_hdr.init_tag == 0 || 22567613f5feSDaniel Borkmann ntohl(peer_init->init_hdr.a_rwnd) < SCTP_DEFAULT_MINWINDOW) 22577ab90804SVlad Yasevich return sctp_process_inv_mandatory(asoc, chunk, errp); 22581da177e4SLinus Torvalds 22591da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 22607613f5feSDaniel Borkmann if (param.p->type == SCTP_PARAM_STATE_COOKIE) 22617613f5feSDaniel Borkmann has_cookie = true; 22627613f5feSDaniel Borkmann } 22631da177e4SLinus Torvalds 22641da177e4SLinus Torvalds /* There is a possibility that a parameter length was bad and 22651da177e4SLinus Torvalds * in that case we would have stoped walking the parameters. 22661da177e4SLinus Torvalds * The current param.p would point at the bad one. 22671da177e4SLinus Torvalds * Current consensus on the mailing list is to generate a PROTOCOL 22681da177e4SLinus Torvalds * VIOLATION error. We build the ERROR chunk here and let the normal 22691da177e4SLinus Torvalds * error handling code build and send the packet. 22701da177e4SLinus Torvalds */ 22717ab90804SVlad Yasevich if (param.v != (void *)chunk->chunk_end) 22727ab90804SVlad Yasevich return sctp_process_inv_paramlength(asoc, param.p, chunk, errp); 22731da177e4SLinus Torvalds 22741da177e4SLinus Torvalds /* The only missing mandatory param possible today is 22751da177e4SLinus Torvalds * the state cookie for an INIT-ACK chunk. 22761da177e4SLinus Torvalds */ 22777ab90804SVlad Yasevich if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) 22787ab90804SVlad Yasevich return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE, 22791da177e4SLinus Torvalds chunk, errp); 22801da177e4SLinus Torvalds 22817ab90804SVlad Yasevich /* Verify all the variable length parameters */ 22821da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2283b14878ccSVlad Yasevich result = sctp_verify_param(net, ep, asoc, param, cid, 2284b14878ccSVlad Yasevich chunk, errp); 22857ab90804SVlad Yasevich switch (result) { 22867ab90804SVlad Yasevich case SCTP_IERROR_ABORT: 22877ab90804SVlad Yasevich case SCTP_IERROR_NOMEM: 22881da177e4SLinus Torvalds return 0; 22897ab90804SVlad Yasevich case SCTP_IERROR_ERROR: 22901da177e4SLinus Torvalds return 1; 22917ab90804SVlad Yasevich case SCTP_IERROR_NO_ERROR: 22927ab90804SVlad Yasevich default: 22937ab90804SVlad Yasevich break; 22941da177e4SLinus Torvalds } 22951da177e4SLinus Torvalds 22961da177e4SLinus Torvalds } /* for (loop through all parameters) */ 22971da177e4SLinus Torvalds 22981da177e4SLinus Torvalds return 1; 22991da177e4SLinus Torvalds } 23001da177e4SLinus Torvalds 23011da177e4SLinus Torvalds /* Unpack the parameters in an INIT packet into an association. 23021da177e4SLinus Torvalds * Returns 0 on failure, else success. 23031da177e4SLinus Torvalds * FIXME: This is an association method. 23041da177e4SLinus Torvalds */ 2305de6becdcSWei Yongjun int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk, 23061da177e4SLinus Torvalds const union sctp_addr *peer_addr, 230701a992beSXin Long struct sctp_init_chunk *peer_init, gfp_t gfp) 23081da177e4SLinus Torvalds { 2309e1fc3b14SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 23101da177e4SLinus Torvalds struct sctp_transport *transport; 23111da177e4SLinus Torvalds struct list_head *pos, *temp; 2312327c0dabSXin Long union sctp_params param; 2313de6becdcSWei Yongjun union sctp_addr addr; 2314327c0dabSXin Long struct sctp_af *af; 2315de6becdcSWei Yongjun int src_match = 0; 2316327c0dabSXin Long char *cookie; 23171da177e4SLinus Torvalds 23181da177e4SLinus Torvalds /* We must include the address that the INIT packet came from. 23191da177e4SLinus Torvalds * This is the only address that matters for an INIT packet. 23201da177e4SLinus Torvalds * When processing a COOKIE ECHO, we retrieve the from address 23211da177e4SLinus Torvalds * of the INIT from the cookie. 23221da177e4SLinus Torvalds */ 23231da177e4SLinus Torvalds 23241da177e4SLinus Torvalds /* This implementation defaults to making the first transport 23251da177e4SLinus Torvalds * added as the primary transport. The source address seems to 23261da177e4SLinus Torvalds * be a a better choice than any of the embedded addresses. 23271da177e4SLinus Torvalds */ 23286a1e5f33SAl Viro if (!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE)) 23291da177e4SLinus Torvalds goto nomem; 2330de6becdcSWei Yongjun 2331de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr)) 2332de6becdcSWei Yongjun src_match = 1; 23331da177e4SLinus Torvalds 23341da177e4SLinus Torvalds /* Process the initialization parameters. */ 23351da177e4SLinus Torvalds sctp_walk_params(param, peer_init, init_hdr.params) { 2336de6becdcSWei Yongjun if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 2337de6becdcSWei Yongjun param.p->type == SCTP_PARAM_IPV6_ADDRESS)) { 2338de6becdcSWei Yongjun af = sctp_get_af_specific(param_type2af(param.p->type)); 2339de6becdcSWei Yongjun af->from_addr_param(&addr, param.addr, 2340de6becdcSWei Yongjun chunk->sctp_hdr->source, 0); 2341de6becdcSWei Yongjun if (sctp_cmp_addr_exact(sctp_source(chunk), &addr)) 2342de6becdcSWei Yongjun src_match = 1; 2343de6becdcSWei Yongjun } 23441da177e4SLinus Torvalds 23451da177e4SLinus Torvalds if (!sctp_process_param(asoc, param, peer_addr, gfp)) 23461da177e4SLinus Torvalds goto clean_up; 23471da177e4SLinus Torvalds } 23481da177e4SLinus Torvalds 2349de6becdcSWei Yongjun /* source address of chunk may not match any valid address */ 2350de6becdcSWei Yongjun if (!src_match) 2351de6becdcSWei Yongjun goto clean_up; 2352de6becdcSWei Yongjun 2353730fc3d0SVlad Yasevich /* AUTH: After processing the parameters, make sure that we 2354730fc3d0SVlad Yasevich * have all the required info to potentially do authentications. 2355730fc3d0SVlad Yasevich */ 2356730fc3d0SVlad Yasevich if (asoc->peer.auth_capable && (!asoc->peer.peer_random || 2357730fc3d0SVlad Yasevich !asoc->peer.peer_hmacs)) 2358730fc3d0SVlad Yasevich asoc->peer.auth_capable = 0; 2359730fc3d0SVlad Yasevich 2360d6701191SVlad Yasevich /* In a non-backward compatible mode, if the peer claims 2361d6701191SVlad Yasevich * support for ADD-IP but not AUTH, the ADD-IP spec states 2362d6701191SVlad Yasevich * that we MUST ABORT the association. Section 6. The section 2363d6701191SVlad Yasevich * also give us an option to silently ignore the packet, which 2364d6701191SVlad Yasevich * is what we'll do here. 23656b2f9cb6SVlad Yasevich */ 2366e1fc3b14SEric W. Biederman if (!net->sctp.addip_noauth && 236773d9c4fdSVlad Yasevich (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) { 23686b2f9cb6SVlad Yasevich asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP | 23696b2f9cb6SVlad Yasevich SCTP_PARAM_DEL_IP | 23706b2f9cb6SVlad Yasevich SCTP_PARAM_SET_PRIMARY); 237188799fe5SVlad Yasevich asoc->peer.asconf_capable = 0; 2372d6701191SVlad Yasevich goto clean_up; 23736b2f9cb6SVlad Yasevich } 23746b2f9cb6SVlad Yasevich 23753f7a87d2SFrank Filz /* Walk list of transports, removing transports in the UNKNOWN state. */ 23763f7a87d2SFrank Filz list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 23773f7a87d2SFrank Filz transport = list_entry(pos, struct sctp_transport, transports); 23783f7a87d2SFrank Filz if (transport->state == SCTP_UNKNOWN) { 23793f7a87d2SFrank Filz sctp_assoc_rm_peer(asoc, transport); 23803f7a87d2SFrank Filz } 23813f7a87d2SFrank Filz } 23823f7a87d2SFrank Filz 23831da177e4SLinus Torvalds /* The fixed INIT headers are always in network byte 23841da177e4SLinus Torvalds * order. 23851da177e4SLinus Torvalds */ 23861da177e4SLinus Torvalds asoc->peer.i.init_tag = 23871da177e4SLinus Torvalds ntohl(peer_init->init_hdr.init_tag); 23881da177e4SLinus Torvalds asoc->peer.i.a_rwnd = 23891da177e4SLinus Torvalds ntohl(peer_init->init_hdr.a_rwnd); 23901da177e4SLinus Torvalds asoc->peer.i.num_outbound_streams = 23911da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 23921da177e4SLinus Torvalds asoc->peer.i.num_inbound_streams = 23931da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 23941da177e4SLinus Torvalds asoc->peer.i.initial_tsn = 23951da177e4SLinus Torvalds ntohl(peer_init->init_hdr.initial_tsn); 23961da177e4SLinus Torvalds 2397cc16f00fSXin Long asoc->strreset_inseq = asoc->peer.i.initial_tsn; 2398cc16f00fSXin Long 23991da177e4SLinus Torvalds /* Apply the upper bounds for output streams based on peer's 24001da177e4SLinus Torvalds * number of inbound streams. 24011da177e4SLinus Torvalds */ 24021da177e4SLinus Torvalds if (asoc->c.sinit_num_ostreams > 24031da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams)) { 24041da177e4SLinus Torvalds asoc->c.sinit_num_ostreams = 24051da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_inbound_streams); 24061da177e4SLinus Torvalds } 24071da177e4SLinus Torvalds 24081da177e4SLinus Torvalds if (asoc->c.sinit_max_instreams > 24091da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams)) { 24101da177e4SLinus Torvalds asoc->c.sinit_max_instreams = 24111da177e4SLinus Torvalds ntohs(peer_init->init_hdr.num_outbound_streams); 24121da177e4SLinus Torvalds } 24131da177e4SLinus Torvalds 24141da177e4SLinus Torvalds /* Copy Initiation tag from INIT to VT_peer in cookie. */ 24151da177e4SLinus Torvalds asoc->c.peer_vtag = asoc->peer.i.init_tag; 24161da177e4SLinus Torvalds 24171da177e4SLinus Torvalds /* Peer Rwnd : Current calculated value of the peer's rwnd. */ 24181da177e4SLinus Torvalds asoc->peer.rwnd = asoc->peer.i.a_rwnd; 24191da177e4SLinus Torvalds 24201da177e4SLinus Torvalds /* Copy cookie in case we need to resend COOKIE-ECHO. */ 24211da177e4SLinus Torvalds cookie = asoc->peer.cookie; 24221da177e4SLinus Torvalds if (cookie) { 2423af997d8cSArnaldo Carvalho de Melo asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp); 24241da177e4SLinus Torvalds if (!asoc->peer.cookie) 24251da177e4SLinus Torvalds goto clean_up; 24261da177e4SLinus Torvalds } 24271da177e4SLinus Torvalds 24281da177e4SLinus Torvalds /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily 24291da177e4SLinus Torvalds * high (for example, implementations MAY use the size of the receiver 24301da177e4SLinus Torvalds * advertised window). 24311da177e4SLinus Torvalds */ 24329dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 24339dbc15f0SRobert P. J. Day transports) { 24341da177e4SLinus Torvalds transport->ssthresh = asoc->peer.i.a_rwnd; 24351da177e4SLinus Torvalds } 24361da177e4SLinus Torvalds 24371da177e4SLinus Torvalds /* Set up the TSN tracking pieces. */ 24388e1ee18cSVlad Yasevich if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 24398e1ee18cSVlad Yasevich asoc->peer.i.initial_tsn, gfp)) 24408e1ee18cSVlad Yasevich goto clean_up; 24411da177e4SLinus Torvalds 24421da177e4SLinus Torvalds /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number 24431da177e4SLinus Torvalds * 24441da177e4SLinus Torvalds * The stream sequence number in all the streams shall start 24451da177e4SLinus Torvalds * from 0 when the association is established. Also, when the 24461da177e4SLinus Torvalds * stream sequence number reaches the value 65535 the next 24471da177e4SLinus Torvalds * stream sequence number shall be set to 0. 24481da177e4SLinus Torvalds */ 24491da177e4SLinus Torvalds 2450ff356414SXin Long if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, 2451ff356414SXin Long asoc->c.sinit_max_instreams, gfp)) 24521da177e4SLinus Torvalds goto clean_up; 24531da177e4SLinus Torvalds 24547e062977SXin Long if (!asoc->temp && sctp_assoc_set_id(asoc, gfp)) 24551da177e4SLinus Torvalds goto clean_up; 24561da177e4SLinus Torvalds 24571da177e4SLinus Torvalds /* ADDIP Section 4.1 ASCONF Chunk Procedures 24581da177e4SLinus Torvalds * 24591da177e4SLinus Torvalds * When an endpoint has an ASCONF signaled change to be sent to the 24601da177e4SLinus Torvalds * remote endpoint it should do the following: 24611da177e4SLinus Torvalds * ... 24621da177e4SLinus Torvalds * A2) A serial number should be assigned to the Chunk. The serial 24631da177e4SLinus Torvalds * number should be a monotonically increasing number. All serial 24641da177e4SLinus Torvalds * numbers are defined to be initialized at the start of the 24651da177e4SLinus Torvalds * association to the same value as the Initial TSN. 24661da177e4SLinus Torvalds */ 24671da177e4SLinus Torvalds asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1; 24681da177e4SLinus Torvalds return 1; 24691da177e4SLinus Torvalds 24701da177e4SLinus Torvalds clean_up: 24711da177e4SLinus Torvalds /* Release the transport structures. */ 24721da177e4SLinus Torvalds list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 24731da177e4SLinus Torvalds transport = list_entry(pos, struct sctp_transport, transports); 2474add52379SVlad Yasevich if (transport->state != SCTP_ACTIVE) 2475add52379SVlad Yasevich sctp_assoc_rm_peer(asoc, transport); 24761da177e4SLinus Torvalds } 24773f7a87d2SFrank Filz 24781da177e4SLinus Torvalds nomem: 24791da177e4SLinus Torvalds return 0; 24801da177e4SLinus Torvalds } 24811da177e4SLinus Torvalds 24821da177e4SLinus Torvalds 24831da177e4SLinus Torvalds /* Update asoc with the option described in param. 24841da177e4SLinus Torvalds * 24851da177e4SLinus Torvalds * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT 24861da177e4SLinus Torvalds * 24871da177e4SLinus Torvalds * asoc is the association to update. 24881da177e4SLinus Torvalds * param is the variable length parameter to use for update. 24891da177e4SLinus Torvalds * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO. 24901da177e4SLinus Torvalds * If the current packet is an INIT we want to minimize the amount of 24911da177e4SLinus Torvalds * work we do. In particular, we should not build transport 24921da177e4SLinus Torvalds * structures for the addresses. 24931da177e4SLinus Torvalds */ 24941da177e4SLinus Torvalds static int sctp_process_param(struct sctp_association *asoc, 24951da177e4SLinus Torvalds union sctp_params param, 24961da177e4SLinus Torvalds const union sctp_addr *peer_addr, 2497dd0fc66fSAl Viro gfp_t gfp) 24981da177e4SLinus Torvalds { 2499e7ff4a70SEric W. Biederman struct net *net = sock_net(asoc->base.sk); 2500327c0dabSXin Long struct sctp_endpoint *ep = asoc->ep; 2501d6de3097SVlad Yasevich union sctp_addr_param *addr_param; 2502d6de3097SVlad Yasevich struct sctp_transport *t; 2503327c0dabSXin Long enum sctp_scope scope; 2504327c0dabSXin Long union sctp_addr addr; 2505327c0dabSXin Long struct sctp_af *af; 2506327c0dabSXin Long int retval = 1, i; 2507327c0dabSXin Long u32 stale; 2508327c0dabSXin Long __u16 sat; 25091da177e4SLinus Torvalds 25101da177e4SLinus Torvalds /* We maintain all INIT parameters in network byte order all the 25111da177e4SLinus Torvalds * time. This allows us to not worry about whether the parameters 25121da177e4SLinus Torvalds * came from a fresh INIT, and INIT ACK, or were stored in a cookie. 25131da177e4SLinus Torvalds */ 25141da177e4SLinus Torvalds switch (param.p->type) { 25151da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25161da177e4SLinus Torvalds if (PF_INET6 != asoc->base.sk->sk_family) 25171da177e4SLinus Torvalds break; 25187dab83deSVlad Yasevich goto do_addr_param; 25197dab83deSVlad Yasevich 25201da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25217dab83deSVlad Yasevich /* v4 addresses are not allowed on v6-only socket */ 25227dab83deSVlad Yasevich if (ipv6_only_sock(asoc->base.sk)) 25237dab83deSVlad Yasevich break; 25247dab83deSVlad Yasevich do_addr_param: 25251da177e4SLinus Torvalds af = sctp_get_af_specific(param_type2af(param.p->type)); 2526dd86d136SAl Viro af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0); 25271da177e4SLinus Torvalds scope = sctp_scope(peer_addr); 2528e7ff4a70SEric W. Biederman if (sctp_in_scope(net, &addr, scope)) 2529dd86d136SAl Viro if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED)) 25301da177e4SLinus Torvalds return 0; 25311da177e4SLinus Torvalds break; 25321da177e4SLinus Torvalds 25331da177e4SLinus Torvalds case SCTP_PARAM_COOKIE_PRESERVATIVE: 2534e1fc3b14SEric W. Biederman if (!net->sctp.cookie_preserve_enable) 25351da177e4SLinus Torvalds break; 25361da177e4SLinus Torvalds 25371da177e4SLinus Torvalds stale = ntohl(param.life->lifespan_increment); 25381da177e4SLinus Torvalds 25391da177e4SLinus Torvalds /* Suggested Cookie Life span increment's unit is msec, 25401da177e4SLinus Torvalds * (1/1000sec). 25411da177e4SLinus Torvalds */ 254252db882fSDaniel Borkmann asoc->cookie_life = ktime_add_ms(asoc->cookie_life, stale); 25431da177e4SLinus Torvalds break; 25441da177e4SLinus Torvalds 25451da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 2546bb33381dSDaniel Borkmann pr_debug("%s: unimplemented SCTP_HOST_NAME_ADDRESS\n", __func__); 25471da177e4SLinus Torvalds break; 25481da177e4SLinus Torvalds 25491da177e4SLinus Torvalds case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES: 25501da177e4SLinus Torvalds /* Turn off the default values first so we'll know which 25511da177e4SLinus Torvalds * ones are really set by the peer. 25521da177e4SLinus Torvalds */ 25531da177e4SLinus Torvalds asoc->peer.ipv4_address = 0; 25541da177e4SLinus Torvalds asoc->peer.ipv6_address = 0; 25551da177e4SLinus Torvalds 2556140ee960SGui Jianfeng /* Assume that peer supports the address family 2557140ee960SGui Jianfeng * by which it sends a packet. 2558140ee960SGui Jianfeng */ 2559140ee960SGui Jianfeng if (peer_addr->sa.sa_family == AF_INET6) 2560140ee960SGui Jianfeng asoc->peer.ipv6_address = 1; 2561140ee960SGui Jianfeng else if (peer_addr->sa.sa_family == AF_INET) 2562140ee960SGui Jianfeng asoc->peer.ipv4_address = 1; 2563140ee960SGui Jianfeng 25641da177e4SLinus Torvalds /* Cycle through address types; avoid divide by 0. */ 25653c918704SXin Long sat = ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 25661da177e4SLinus Torvalds if (sat) 25671da177e4SLinus Torvalds sat /= sizeof(__u16); 25681da177e4SLinus Torvalds 25691da177e4SLinus Torvalds for (i = 0; i < sat; ++i) { 25701da177e4SLinus Torvalds switch (param.sat->types[i]) { 25711da177e4SLinus Torvalds case SCTP_PARAM_IPV4_ADDRESS: 25721da177e4SLinus Torvalds asoc->peer.ipv4_address = 1; 25731da177e4SLinus Torvalds break; 25741da177e4SLinus Torvalds 25751da177e4SLinus Torvalds case SCTP_PARAM_IPV6_ADDRESS: 25766e40a915SWei Yongjun if (PF_INET6 == asoc->base.sk->sk_family) 25771da177e4SLinus Torvalds asoc->peer.ipv6_address = 1; 25781da177e4SLinus Torvalds break; 25791da177e4SLinus Torvalds 25801da177e4SLinus Torvalds case SCTP_PARAM_HOST_NAME_ADDRESS: 25811da177e4SLinus Torvalds asoc->peer.hostname_address = 1; 25821da177e4SLinus Torvalds break; 25831da177e4SLinus Torvalds 25841da177e4SLinus Torvalds default: /* Just ignore anything else. */ 25851da177e4SLinus Torvalds break; 25863ff50b79SStephen Hemminger } 25871da177e4SLinus Torvalds } 25881da177e4SLinus Torvalds break; 25891da177e4SLinus Torvalds 25901da177e4SLinus Torvalds case SCTP_PARAM_STATE_COOKIE: 25911da177e4SLinus Torvalds asoc->peer.cookie_len = 25923c918704SXin Long ntohs(param.p->length) - sizeof(struct sctp_paramhdr); 25931da177e4SLinus Torvalds asoc->peer.cookie = param.cookie->body; 25941da177e4SLinus Torvalds break; 25951da177e4SLinus Torvalds 25961da177e4SLinus Torvalds case SCTP_PARAM_HEARTBEAT_INFO: 25971da177e4SLinus Torvalds /* Would be odd to receive, but it causes no problems. */ 25981da177e4SLinus Torvalds break; 25991da177e4SLinus Torvalds 26001da177e4SLinus Torvalds case SCTP_PARAM_UNRECOGNIZED_PARAMETERS: 26011da177e4SLinus Torvalds /* Rejected during verify stage. */ 26021da177e4SLinus Torvalds break; 26031da177e4SLinus Torvalds 26041da177e4SLinus Torvalds case SCTP_PARAM_ECN_CAPABLE: 26051da177e4SLinus Torvalds asoc->peer.ecn_capable = 1; 26061da177e4SLinus Torvalds break; 26071da177e4SLinus Torvalds 26080f3fffd8SIvan Skytte Jorgensen case SCTP_PARAM_ADAPTATION_LAYER_IND: 2609e69c4e0fSVlad Yasevich asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind); 26101da177e4SLinus Torvalds break; 26111da177e4SLinus Torvalds 2612d6de3097SVlad Yasevich case SCTP_PARAM_SET_PRIMARY: 2613e1fc3b14SEric W. Biederman if (!net->sctp.addip_enable) 26140ef46e28SVlad Yasevich goto fall_through; 26150ef46e28SVlad Yasevich 26168b32f234SXin Long addr_param = param.v + sizeof(struct sctp_addip_param); 2617d6de3097SVlad Yasevich 2618cfbf654eSSaran Maruti Ramanara af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 2619e40607cbSDaniel Borkmann if (af == NULL) 2620e40607cbSDaniel Borkmann break; 2621e40607cbSDaniel Borkmann 2622d6de3097SVlad Yasevich af->from_addr_param(&addr, addr_param, 2623d6de3097SVlad Yasevich htons(asoc->peer.port), 0); 2624d6de3097SVlad Yasevich 2625d6de3097SVlad Yasevich /* if the address is invalid, we can't process it. 2626d6de3097SVlad Yasevich * XXX: see spec for what to do. 2627d6de3097SVlad Yasevich */ 2628d6de3097SVlad Yasevich if (!af->addr_valid(&addr, NULL, NULL)) 2629d6de3097SVlad Yasevich break; 2630d6de3097SVlad Yasevich 2631d6de3097SVlad Yasevich t = sctp_assoc_lookup_paddr(asoc, &addr); 2632d6de3097SVlad Yasevich if (!t) 2633d6de3097SVlad Yasevich break; 2634d6de3097SVlad Yasevich 2635d6de3097SVlad Yasevich sctp_assoc_set_primary(asoc, t); 2636d6de3097SVlad Yasevich break; 2637d6de3097SVlad Yasevich 2638131a47e3SVlad Yasevich case SCTP_PARAM_SUPPORTED_EXT: 2639131a47e3SVlad Yasevich sctp_process_ext_param(asoc, param); 2640131a47e3SVlad Yasevich break; 2641131a47e3SVlad Yasevich 26421da177e4SLinus Torvalds case SCTP_PARAM_FWD_TSN_SUPPORT: 264328aa4c26SXin Long if (asoc->prsctp_enable) { 26441da177e4SLinus Torvalds asoc->peer.prsctp_capable = 1; 26451da177e4SLinus Torvalds break; 26461da177e4SLinus Torvalds } 26471da177e4SLinus Torvalds /* Fall Through */ 2648730fc3d0SVlad Yasevich goto fall_through; 2649730fc3d0SVlad Yasevich 2650730fc3d0SVlad Yasevich case SCTP_PARAM_RANDOM: 2651b14878ccSVlad Yasevich if (!ep->auth_enable) 2652730fc3d0SVlad Yasevich goto fall_through; 2653730fc3d0SVlad Yasevich 2654730fc3d0SVlad Yasevich /* Save peer's random parameter */ 2655730fc3d0SVlad Yasevich asoc->peer.peer_random = kmemdup(param.p, 2656730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2657730fc3d0SVlad Yasevich if (!asoc->peer.peer_random) { 2658730fc3d0SVlad Yasevich retval = 0; 2659730fc3d0SVlad Yasevich break; 2660730fc3d0SVlad Yasevich } 2661730fc3d0SVlad Yasevich break; 2662730fc3d0SVlad Yasevich 2663730fc3d0SVlad Yasevich case SCTP_PARAM_HMAC_ALGO: 2664b14878ccSVlad Yasevich if (!ep->auth_enable) 2665730fc3d0SVlad Yasevich goto fall_through; 2666730fc3d0SVlad Yasevich 2667730fc3d0SVlad Yasevich /* Save peer's HMAC list */ 2668730fc3d0SVlad Yasevich asoc->peer.peer_hmacs = kmemdup(param.p, 2669730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2670730fc3d0SVlad Yasevich if (!asoc->peer.peer_hmacs) { 2671730fc3d0SVlad Yasevich retval = 0; 2672730fc3d0SVlad Yasevich break; 2673730fc3d0SVlad Yasevich } 2674730fc3d0SVlad Yasevich 2675730fc3d0SVlad Yasevich /* Set the default HMAC the peer requested*/ 2676730fc3d0SVlad Yasevich sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo); 2677730fc3d0SVlad Yasevich break; 2678730fc3d0SVlad Yasevich 2679730fc3d0SVlad Yasevich case SCTP_PARAM_CHUNKS: 2680b14878ccSVlad Yasevich if (!ep->auth_enable) 2681730fc3d0SVlad Yasevich goto fall_through; 2682730fc3d0SVlad Yasevich 2683730fc3d0SVlad Yasevich asoc->peer.peer_chunks = kmemdup(param.p, 2684730fc3d0SVlad Yasevich ntohs(param.p->length), gfp); 2685730fc3d0SVlad Yasevich if (!asoc->peer.peer_chunks) 2686730fc3d0SVlad Yasevich retval = 0; 2687730fc3d0SVlad Yasevich break; 2688730fc3d0SVlad Yasevich fall_through: 26891da177e4SLinus Torvalds default: 26901da177e4SLinus Torvalds /* Any unrecognized parameters should have been caught 26911da177e4SLinus Torvalds * and handled by sctp_verify_param() which should be 26921da177e4SLinus Torvalds * called prior to this routine. Simply log the error 26931da177e4SLinus Torvalds * here. 26941da177e4SLinus Torvalds */ 2695bb33381dSDaniel Borkmann pr_debug("%s: ignoring param:%d for association:%p.\n", 2696bb33381dSDaniel Borkmann __func__, ntohs(param.p->type), asoc); 26971da177e4SLinus Torvalds break; 26983ff50b79SStephen Hemminger } 26991da177e4SLinus Torvalds 27001da177e4SLinus Torvalds return retval; 27011da177e4SLinus Torvalds } 27021da177e4SLinus Torvalds 27031da177e4SLinus Torvalds /* Select a new verification tag. */ 27041da177e4SLinus Torvalds __u32 sctp_generate_tag(const struct sctp_endpoint *ep) 27051da177e4SLinus Torvalds { 27061da177e4SLinus Torvalds /* I believe that this random number generator complies with RFC1750. 27071da177e4SLinus Torvalds * A tag of 0 is reserved for special cases (e.g. INIT). 27081da177e4SLinus Torvalds */ 27091da177e4SLinus Torvalds __u32 x; 27101da177e4SLinus Torvalds 27111da177e4SLinus Torvalds do { 27121da177e4SLinus Torvalds get_random_bytes(&x, sizeof(__u32)); 27131da177e4SLinus Torvalds } while (x == 0); 27141da177e4SLinus Torvalds 27151da177e4SLinus Torvalds return x; 27161da177e4SLinus Torvalds } 27171da177e4SLinus Torvalds 27181da177e4SLinus Torvalds /* Select an initial TSN to send during startup. */ 27191da177e4SLinus Torvalds __u32 sctp_generate_tsn(const struct sctp_endpoint *ep) 27201da177e4SLinus Torvalds { 27211da177e4SLinus Torvalds __u32 retval; 27221da177e4SLinus Torvalds 27231da177e4SLinus Torvalds get_random_bytes(&retval, sizeof(__u32)); 27241da177e4SLinus Torvalds return retval; 27251da177e4SLinus Torvalds } 27261da177e4SLinus Torvalds 27271da177e4SLinus Torvalds /* 27281da177e4SLinus Torvalds * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF) 27291da177e4SLinus Torvalds * 0 1 2 3 27301da177e4SLinus 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 27311da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27321da177e4SLinus Torvalds * | Type = 0xC1 | Chunk Flags | Chunk Length | 27331da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27341da177e4SLinus Torvalds * | Serial Number | 27351da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27361da177e4SLinus Torvalds * | Address Parameter | 27371da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27381da177e4SLinus Torvalds * | ASCONF Parameter #1 | 27391da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27401da177e4SLinus Torvalds * \ \ 27411da177e4SLinus Torvalds * / .... / 27421da177e4SLinus Torvalds * \ \ 27431da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27441da177e4SLinus Torvalds * | ASCONF Parameter #N | 27451da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27461da177e4SLinus Torvalds * 27471da177e4SLinus Torvalds * Address Parameter and other parameter will not be wrapped in this function 27481da177e4SLinus Torvalds */ 27491da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc, 27501da177e4SLinus Torvalds union sctp_addr *addr, 27511da177e4SLinus Torvalds int vparam_len) 27521da177e4SLinus Torvalds { 275365205cc4SXin Long struct sctp_addiphdr asconf; 27541da177e4SLinus Torvalds struct sctp_chunk *retval; 27551da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 27561da177e4SLinus Torvalds union sctp_addr_param addrparam; 27571da177e4SLinus Torvalds int addrlen; 27581da177e4SLinus Torvalds struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 27591da177e4SLinus Torvalds 27601da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 27611da177e4SLinus Torvalds if (!addrlen) 27621da177e4SLinus Torvalds return NULL; 27631da177e4SLinus Torvalds length += addrlen; 27641da177e4SLinus Torvalds 27651da177e4SLinus Torvalds /* Create the chunk. */ 2766cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF, 0, length, 2767cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 27681da177e4SLinus Torvalds if (!retval) 27691da177e4SLinus Torvalds return NULL; 27701da177e4SLinus Torvalds 27711da177e4SLinus Torvalds asconf.serial = htonl(asoc->addip_serial++); 27721da177e4SLinus Torvalds 27731da177e4SLinus Torvalds retval->subh.addip_hdr = 27741da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 27751da177e4SLinus Torvalds retval->param_hdr.v = 27761da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 27771da177e4SLinus Torvalds 27781da177e4SLinus Torvalds return retval; 27791da177e4SLinus Torvalds } 27801da177e4SLinus Torvalds 27811da177e4SLinus Torvalds /* ADDIP 27821da177e4SLinus Torvalds * 3.2.1 Add IP Address 27831da177e4SLinus Torvalds * 0 1 2 3 27841da177e4SLinus 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 27851da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27861da177e4SLinus Torvalds * | Type = 0xC001 | Length = Variable | 27871da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27881da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 27891da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27901da177e4SLinus Torvalds * | Address Parameter | 27911da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27921da177e4SLinus Torvalds * 27931da177e4SLinus Torvalds * 3.2.2 Delete IP Address 27941da177e4SLinus Torvalds * 0 1 2 3 27951da177e4SLinus 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 27961da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27971da177e4SLinus Torvalds * | Type = 0xC002 | Length = Variable | 27981da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27991da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28001da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28011da177e4SLinus Torvalds * | Address Parameter | 28021da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28031da177e4SLinus Torvalds * 28041da177e4SLinus Torvalds */ 28051da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc, 28061da177e4SLinus Torvalds union sctp_addr *laddr, 28071da177e4SLinus Torvalds struct sockaddr *addrs, 2808327c0dabSXin Long int addrcnt, __be16 flags) 28091da177e4SLinus Torvalds { 28101da177e4SLinus Torvalds union sctp_addr_param addr_param; 2811327c0dabSXin Long struct sctp_addip_param param; 28121da177e4SLinus Torvalds int paramlen = sizeof(param); 2813327c0dabSXin Long struct sctp_chunk *retval; 28141da177e4SLinus Torvalds int addr_param_len = 0; 2815327c0dabSXin Long union sctp_addr *addr; 2816327c0dabSXin Long int totallen = 0, i; 28178a07eb0aSMichio Honda int del_pickup = 0; 2818327c0dabSXin Long struct sctp_af *af; 2819327c0dabSXin Long void *addr_buf; 28201da177e4SLinus Torvalds 28211da177e4SLinus Torvalds /* Get total length of all the address parameters. */ 28221da177e4SLinus Torvalds addr_buf = addrs; 28231da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2824ea110733SJoe Perches addr = addr_buf; 28251da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28261da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28271da177e4SLinus Torvalds 28281da177e4SLinus Torvalds totallen += paramlen; 28291da177e4SLinus Torvalds totallen += addr_param_len; 28301da177e4SLinus Torvalds 28311da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28328a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending && !del_pickup) { 28338a07eb0aSMichio Honda /* reuse the parameter length from the same scope one */ 28348a07eb0aSMichio Honda totallen += paramlen; 28358a07eb0aSMichio Honda totallen += addr_param_len; 28368a07eb0aSMichio Honda del_pickup = 1; 2837bb33381dSDaniel Borkmann 2838bb33381dSDaniel Borkmann pr_debug("%s: picked same-scope del_pending addr, " 2839bb33381dSDaniel Borkmann "totallen for all addresses is %d\n", 2840bb33381dSDaniel Borkmann __func__, totallen); 28418a07eb0aSMichio Honda } 28421da177e4SLinus Torvalds } 28431da177e4SLinus Torvalds 28441da177e4SLinus Torvalds /* Create an asconf chunk with the required length. */ 28451da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, laddr, totallen); 28461da177e4SLinus Torvalds if (!retval) 28471da177e4SLinus Torvalds return NULL; 28481da177e4SLinus Torvalds 28491da177e4SLinus Torvalds /* Add the address parameters to the asconf chunk. */ 28501da177e4SLinus Torvalds addr_buf = addrs; 28511da177e4SLinus Torvalds for (i = 0; i < addrcnt; i++) { 2852ea110733SJoe Perches addr = addr_buf; 28531da177e4SLinus Torvalds af = sctp_get_af_specific(addr->v4.sin_family); 28541da177e4SLinus Torvalds addr_param_len = af->to_addr_param(addr, &addr_param); 28551da177e4SLinus Torvalds param.param_hdr.type = flags; 28561da177e4SLinus Torvalds param.param_hdr.length = htons(paramlen + addr_param_len); 28571da177e4SLinus Torvalds param.crr_id = i; 28581da177e4SLinus Torvalds 28591da177e4SLinus Torvalds sctp_addto_chunk(retval, paramlen, ¶m); 28601da177e4SLinus Torvalds sctp_addto_chunk(retval, addr_param_len, &addr_param); 28611da177e4SLinus Torvalds 28621da177e4SLinus Torvalds addr_buf += af->sockaddr_len; 28631da177e4SLinus Torvalds } 28648a07eb0aSMichio Honda if (flags == SCTP_PARAM_ADD_IP && del_pickup) { 28658a07eb0aSMichio Honda addr = asoc->asconf_addr_del_pending; 28668a07eb0aSMichio Honda af = sctp_get_af_specific(addr->v4.sin_family); 28678a07eb0aSMichio Honda addr_param_len = af->to_addr_param(addr, &addr_param); 28688a07eb0aSMichio Honda param.param_hdr.type = SCTP_PARAM_DEL_IP; 28698a07eb0aSMichio Honda param.param_hdr.length = htons(paramlen + addr_param_len); 28708a07eb0aSMichio Honda param.crr_id = i; 28718a07eb0aSMichio Honda 28728a07eb0aSMichio Honda sctp_addto_chunk(retval, paramlen, ¶m); 28738a07eb0aSMichio Honda sctp_addto_chunk(retval, addr_param_len, &addr_param); 28748a07eb0aSMichio Honda } 28751da177e4SLinus Torvalds return retval; 28761da177e4SLinus Torvalds } 28771da177e4SLinus Torvalds 28781da177e4SLinus Torvalds /* ADDIP 28791da177e4SLinus Torvalds * 3.2.4 Set Primary IP Address 28801da177e4SLinus Torvalds * 0 1 2 3 28811da177e4SLinus 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 28821da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28831da177e4SLinus Torvalds * | Type =0xC004 | Length = Variable | 28841da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28851da177e4SLinus Torvalds * | ASCONF-Request Correlation ID | 28861da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28871da177e4SLinus Torvalds * | Address Parameter | 28881da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28891da177e4SLinus Torvalds * 28901da177e4SLinus Torvalds * Create an ASCONF chunk with Set Primary IP address parameter. 28911da177e4SLinus Torvalds */ 28921da177e4SLinus Torvalds struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, 28931da177e4SLinus Torvalds union sctp_addr *addr) 28941da177e4SLinus Torvalds { 2895327c0dabSXin Long struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family); 2896327c0dabSXin Long union sctp_addr_param addrparam; 28978b32f234SXin Long struct sctp_addip_param param; 28981da177e4SLinus Torvalds struct sctp_chunk *retval; 28991da177e4SLinus Torvalds int len = sizeof(param); 29001da177e4SLinus Torvalds int addrlen; 29011da177e4SLinus Torvalds 29021da177e4SLinus Torvalds addrlen = af->to_addr_param(addr, &addrparam); 29031da177e4SLinus Torvalds if (!addrlen) 29041da177e4SLinus Torvalds return NULL; 29051da177e4SLinus Torvalds len += addrlen; 29061da177e4SLinus Torvalds 29071da177e4SLinus Torvalds /* Create the chunk and make asconf header. */ 29081da177e4SLinus Torvalds retval = sctp_make_asconf(asoc, addr, len); 29091da177e4SLinus Torvalds if (!retval) 29101da177e4SLinus Torvalds return NULL; 29111da177e4SLinus Torvalds 29121da177e4SLinus Torvalds param.param_hdr.type = SCTP_PARAM_SET_PRIMARY; 29131da177e4SLinus Torvalds param.param_hdr.length = htons(len); 29141da177e4SLinus Torvalds param.crr_id = 0; 29151da177e4SLinus Torvalds 29161da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(param), ¶m); 29171da177e4SLinus Torvalds sctp_addto_chunk(retval, addrlen, &addrparam); 29181da177e4SLinus Torvalds 29191da177e4SLinus Torvalds return retval; 29201da177e4SLinus Torvalds } 29211da177e4SLinus Torvalds 29221da177e4SLinus Torvalds /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) 29231da177e4SLinus Torvalds * 0 1 2 3 29241da177e4SLinus 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 29251da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29261da177e4SLinus Torvalds * | Type = 0x80 | Chunk Flags | Chunk Length | 29271da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29281da177e4SLinus Torvalds * | Serial Number | 29291da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29301da177e4SLinus Torvalds * | ASCONF Parameter Response#1 | 29311da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29321da177e4SLinus Torvalds * \ \ 29331da177e4SLinus Torvalds * / .... / 29341da177e4SLinus Torvalds * \ \ 29351da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29361da177e4SLinus Torvalds * | ASCONF Parameter Response#N | 29371da177e4SLinus Torvalds * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29381da177e4SLinus Torvalds * 29391da177e4SLinus Torvalds * Create an ASCONF_ACK chunk with enough space for the parameter responses. 29401da177e4SLinus Torvalds */ 29411da177e4SLinus Torvalds static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc, 29421da177e4SLinus Torvalds __u32 serial, int vparam_len) 29431da177e4SLinus Torvalds { 294465205cc4SXin Long struct sctp_addiphdr asconf; 29451da177e4SLinus Torvalds struct sctp_chunk *retval; 29461da177e4SLinus Torvalds int length = sizeof(asconf) + vparam_len; 29471da177e4SLinus Torvalds 29481da177e4SLinus Torvalds /* Create the chunk. */ 2949cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_ASCONF_ACK, 0, length, 2950cea8768fSMarcelo Ricardo Leitner GFP_ATOMIC); 29511da177e4SLinus Torvalds if (!retval) 29521da177e4SLinus Torvalds return NULL; 29531da177e4SLinus Torvalds 29541da177e4SLinus Torvalds asconf.serial = htonl(serial); 29551da177e4SLinus Torvalds 29561da177e4SLinus Torvalds retval->subh.addip_hdr = 29571da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(asconf), &asconf); 29581da177e4SLinus Torvalds 29591da177e4SLinus Torvalds return retval; 29601da177e4SLinus Torvalds } 29611da177e4SLinus Torvalds 29621da177e4SLinus Torvalds /* Add response parameters to an ASCONF_ACK chunk. */ 29639f81bcd9SAl Viro static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id, 29648b32f234SXin Long __be16 err_code, 29658b32f234SXin Long struct sctp_addip_param *asconf_param) 29661da177e4SLinus Torvalds { 29678b32f234SXin Long struct sctp_addip_param ack_param; 2968d8238d9dSXin Long struct sctp_errhdr err_param; 29691da177e4SLinus Torvalds int asconf_param_len = 0; 29701da177e4SLinus Torvalds int err_param_len = 0; 2971dbc16db1SAl Viro __be16 response_type; 29721da177e4SLinus Torvalds 29731da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) { 29741da177e4SLinus Torvalds response_type = SCTP_PARAM_SUCCESS_REPORT; 29751da177e4SLinus Torvalds } else { 29761da177e4SLinus Torvalds response_type = SCTP_PARAM_ERR_CAUSE; 29771da177e4SLinus Torvalds err_param_len = sizeof(err_param); 29781da177e4SLinus Torvalds if (asconf_param) 29791da177e4SLinus Torvalds asconf_param_len = 29801da177e4SLinus Torvalds ntohs(asconf_param->param_hdr.length); 29811da177e4SLinus Torvalds } 29821da177e4SLinus Torvalds 29831da177e4SLinus Torvalds /* Add Success Indication or Error Cause Indication parameter. */ 29841da177e4SLinus Torvalds ack_param.param_hdr.type = response_type; 29851da177e4SLinus Torvalds ack_param.param_hdr.length = htons(sizeof(ack_param) + 29861da177e4SLinus Torvalds err_param_len + 29871da177e4SLinus Torvalds asconf_param_len); 29881da177e4SLinus Torvalds ack_param.crr_id = crr_id; 29891da177e4SLinus Torvalds sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param); 29901da177e4SLinus Torvalds 29911da177e4SLinus Torvalds if (SCTP_ERROR_NO_ERROR == err_code) 29921da177e4SLinus Torvalds return; 29931da177e4SLinus Torvalds 29941da177e4SLinus Torvalds /* Add Error Cause parameter. */ 29951da177e4SLinus Torvalds err_param.cause = err_code; 29961da177e4SLinus Torvalds err_param.length = htons(err_param_len + asconf_param_len); 29971da177e4SLinus Torvalds sctp_addto_chunk(chunk, err_param_len, &err_param); 29981da177e4SLinus Torvalds 29991da177e4SLinus Torvalds /* Add the failed TLV copied from ASCONF chunk. */ 30001da177e4SLinus Torvalds if (asconf_param) 30011da177e4SLinus Torvalds sctp_addto_chunk(chunk, asconf_param_len, asconf_param); 30021da177e4SLinus Torvalds } 30031da177e4SLinus Torvalds 30041da177e4SLinus Torvalds /* Process a asconf parameter. */ 3005dbc16db1SAl Viro static __be16 sctp_process_asconf_param(struct sctp_association *asoc, 30061da177e4SLinus Torvalds struct sctp_chunk *asconf, 30078b32f234SXin Long struct sctp_addip_param *asconf_param) 30081da177e4SLinus Torvalds { 30091da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3010327c0dabSXin Long struct sctp_transport *peer; 3011327c0dabSXin Long union sctp_addr addr; 3012327c0dabSXin Long struct sctp_af *af; 30131da177e4SLinus Torvalds 30148b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 3015c1cc678aSPatrick McHardy 301644e65c1eSWei Yongjun if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP && 301744e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP && 301844e65c1eSWei Yongjun asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY) 301944e65c1eSWei Yongjun return SCTP_ERROR_UNKNOWN_PARAM; 302044e65c1eSWei Yongjun 30216a435732SShan Wei switch (addr_param->p.type) { 3022c4492586SWei Yongjun case SCTP_PARAM_IPV6_ADDRESS: 3023c4492586SWei Yongjun if (!asoc->peer.ipv6_address) 3024945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3025c4492586SWei Yongjun break; 3026c4492586SWei Yongjun case SCTP_PARAM_IPV4_ADDRESS: 3027c4492586SWei Yongjun if (!asoc->peer.ipv4_address) 3028945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3029c4492586SWei Yongjun break; 3030c4492586SWei Yongjun default: 3031945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 3032c4492586SWei Yongjun } 3033c4492586SWei Yongjun 30346a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 30351da177e4SLinus Torvalds if (unlikely(!af)) 3036945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 30371da177e4SLinus Torvalds 3038dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0); 303942e30bf3SVlad Yasevich 304042e30bf3SVlad Yasevich /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast 304142e30bf3SVlad Yasevich * or multicast address. 304242e30bf3SVlad Yasevich * (note: wildcard is permitted and requires special handling so 304342e30bf3SVlad Yasevich * make sure we check for that) 304442e30bf3SVlad Yasevich */ 304542e30bf3SVlad Yasevich if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb)) 3046945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 304742e30bf3SVlad Yasevich 30481da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 30491da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 305042e30bf3SVlad Yasevich /* Section 4.2.1: 305142e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the source 305242e30bf3SVlad Yasevich * address of the packet MUST be added. 305342e30bf3SVlad Yasevich */ 305442e30bf3SVlad Yasevich if (af->is_any(&addr)) 305542e30bf3SVlad Yasevich memcpy(&addr, &asconf->source, sizeof(addr)); 305642e30bf3SVlad Yasevich 30571da177e4SLinus Torvalds /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address 30581da177e4SLinus Torvalds * request and does not have the local resources to add this 30591da177e4SLinus Torvalds * new address to the association, it MUST return an Error 30601da177e4SLinus Torvalds * Cause TLV set to the new error code 'Operation Refused 30611da177e4SLinus Torvalds * Due to Resource Shortage'. 30621da177e4SLinus Torvalds */ 30631da177e4SLinus Torvalds 3064dd86d136SAl Viro peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED); 30651da177e4SLinus Torvalds if (!peer) 30661da177e4SLinus Torvalds return SCTP_ERROR_RSRC_LOW; 30671da177e4SLinus Torvalds 30681da177e4SLinus Torvalds /* Start the heartbeat timer. */ 3069ba6f5e33SMarcelo Ricardo Leitner sctp_transport_reset_hb_timer(peer); 30706af29cccSMichio Honda asoc->new_transport = peer; 30711da177e4SLinus Torvalds break; 30721da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 30731da177e4SLinus Torvalds /* ADDIP 4.3 D7) If a request is received to delete the 30741da177e4SLinus Torvalds * last remaining IP address of a peer endpoint, the receiver 30751da177e4SLinus Torvalds * MUST send an Error Cause TLV with the error cause set to the 30761da177e4SLinus Torvalds * new error code 'Request to Delete Last Remaining IP Address'. 30771da177e4SLinus Torvalds */ 307842e30bf3SVlad Yasevich if (asoc->peer.transport_count == 1) 30791da177e4SLinus Torvalds return SCTP_ERROR_DEL_LAST_IP; 30801da177e4SLinus Torvalds 30811da177e4SLinus Torvalds /* ADDIP 4.3 D8) If a request is received to delete an IP 30821da177e4SLinus Torvalds * address which is also the source address of the IP packet 30831da177e4SLinus Torvalds * which contained the ASCONF chunk, the receiver MUST reject 30841da177e4SLinus Torvalds * this request. To reject the request the receiver MUST send 30851da177e4SLinus Torvalds * an Error Cause TLV set to the new error code 'Request to 30861da177e4SLinus Torvalds * Delete Source IP Address' 30871da177e4SLinus Torvalds */ 3088b1364104SMichio Honda if (sctp_cmp_addr_exact(&asconf->source, &addr)) 30891da177e4SLinus Torvalds return SCTP_ERROR_DEL_SRC_IP; 30901da177e4SLinus Torvalds 309142e30bf3SVlad Yasevich /* Section 4.2.2 309242e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, all 309342e30bf3SVlad Yasevich * addresses of the peer except the source address of the 309442e30bf3SVlad Yasevich * packet MUST be deleted. 309542e30bf3SVlad Yasevich */ 309642e30bf3SVlad Yasevich if (af->is_any(&addr)) { 309742e30bf3SVlad Yasevich sctp_assoc_set_primary(asoc, asconf->transport); 309842e30bf3SVlad Yasevich sctp_assoc_del_nonprimary_peers(asoc, 309942e30bf3SVlad Yasevich asconf->transport); 31007c5a9461Slucien return SCTP_ERROR_NO_ERROR; 31017c5a9461Slucien } 31027c5a9461Slucien 31037c5a9461Slucien /* If the address is not part of the association, the 31047c5a9461Slucien * ASCONF-ACK with Error Cause Indication Parameter 31057c5a9461Slucien * which including cause of Unresolvable Address should 31067c5a9461Slucien * be sent. 31077c5a9461Slucien */ 31087c5a9461Slucien peer = sctp_assoc_lookup_paddr(asoc, &addr); 31097c5a9461Slucien if (!peer) 31107c5a9461Slucien return SCTP_ERROR_DNS_FAILED; 31117c5a9461Slucien 31127c5a9461Slucien sctp_assoc_rm_peer(asoc, peer); 31131da177e4SLinus Torvalds break; 31141da177e4SLinus Torvalds case SCTP_PARAM_SET_PRIMARY: 311542e30bf3SVlad Yasevich /* ADDIP Section 4.2.4 311642e30bf3SVlad Yasevich * If the address 0.0.0.0 or ::0 is provided, the receiver 311742e30bf3SVlad Yasevich * MAY mark the source address of the packet as its 311842e30bf3SVlad Yasevich * primary. 311942e30bf3SVlad Yasevich */ 312042e30bf3SVlad Yasevich if (af->is_any(&addr)) 312142e30bf3SVlad Yasevich memcpy(&addr.v4, sctp_source(asconf), sizeof(addr)); 312242e30bf3SVlad Yasevich 3123dd86d136SAl Viro peer = sctp_assoc_lookup_paddr(asoc, &addr); 31241da177e4SLinus Torvalds if (!peer) 3125945e5abcSWei Yongjun return SCTP_ERROR_DNS_FAILED; 31261da177e4SLinus Torvalds 31271da177e4SLinus Torvalds sctp_assoc_set_primary(asoc, peer); 31281da177e4SLinus Torvalds break; 31291da177e4SLinus Torvalds } 31301da177e4SLinus Torvalds 31311da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 31321da177e4SLinus Torvalds } 31331da177e4SLinus Torvalds 31346f4c618dSWei Yongjun /* Verify the ASCONF packet before we process it. */ 31359de7922bSDaniel Borkmann bool sctp_verify_asconf(const struct sctp_association *asoc, 31369de7922bSDaniel Borkmann struct sctp_chunk *chunk, bool addr_param_needed, 31379de7922bSDaniel Borkmann struct sctp_paramhdr **errp) 31389de7922bSDaniel Borkmann { 313968d75469SXin Long struct sctp_addip_chunk *addip; 31409de7922bSDaniel Borkmann bool addr_param_seen = false; 3141327c0dabSXin Long union sctp_params param; 31426f4c618dSWei Yongjun 314368d75469SXin Long addip = (struct sctp_addip_chunk *)chunk->chunk_hdr; 31449de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 31459de7922bSDaniel Borkmann size_t length = ntohs(param.p->length); 31469de7922bSDaniel Borkmann 31476f4c618dSWei Yongjun *errp = param.p; 31486f4c618dSWei Yongjun switch (param.p->type) { 31499de7922bSDaniel Borkmann case SCTP_PARAM_ERR_CAUSE: 31509de7922bSDaniel Borkmann break; 31519de7922bSDaniel Borkmann case SCTP_PARAM_IPV4_ADDRESS: 3152a38905e6SXin Long if (length != sizeof(struct sctp_ipv4addr_param)) 31539de7922bSDaniel Borkmann return false; 3154ce7b4cccSlucien /* ensure there is only one addr param and it's in the 3155ce7b4cccSlucien * beginning of addip_hdr params, or we reject it. 3156ce7b4cccSlucien */ 3157ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3158ce7b4cccSlucien return false; 31599de7922bSDaniel Borkmann addr_param_seen = true; 31609de7922bSDaniel Borkmann break; 31619de7922bSDaniel Borkmann case SCTP_PARAM_IPV6_ADDRESS: 316200987cc0SXin Long if (length != sizeof(struct sctp_ipv6addr_param)) 31639de7922bSDaniel Borkmann return false; 3164ce7b4cccSlucien if (param.v != addip->addip_hdr.params) 3165ce7b4cccSlucien return false; 31669de7922bSDaniel Borkmann addr_param_seen = true; 31679de7922bSDaniel Borkmann break; 31686f4c618dSWei Yongjun case SCTP_PARAM_ADD_IP: 31696f4c618dSWei Yongjun case SCTP_PARAM_DEL_IP: 31706f4c618dSWei Yongjun case SCTP_PARAM_SET_PRIMARY: 31719de7922bSDaniel Borkmann /* In ASCONF chunks, these need to be first. */ 31729de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 31739de7922bSDaniel Borkmann return false; 31749de7922bSDaniel Borkmann length = ntohs(param.addip->param_hdr.length); 31758b32f234SXin Long if (length < sizeof(struct sctp_addip_param) + 31763c918704SXin Long sizeof(**errp)) 31779de7922bSDaniel Borkmann return false; 31786f4c618dSWei Yongjun break; 31796f4c618dSWei Yongjun case SCTP_PARAM_SUCCESS_REPORT: 31806f4c618dSWei Yongjun case SCTP_PARAM_ADAPTATION_LAYER_IND: 31818b32f234SXin Long if (length != sizeof(struct sctp_addip_param)) 31829de7922bSDaniel Borkmann return false; 31836f4c618dSWei Yongjun break; 31846f4c618dSWei Yongjun default: 31859de7922bSDaniel Borkmann /* This is unkown to us, reject! */ 31869de7922bSDaniel Borkmann return false; 31879de7922bSDaniel Borkmann } 31886f4c618dSWei Yongjun } 31896f4c618dSWei Yongjun 31909de7922bSDaniel Borkmann /* Remaining sanity checks. */ 31919de7922bSDaniel Borkmann if (addr_param_needed && !addr_param_seen) 31929de7922bSDaniel Borkmann return false; 31939de7922bSDaniel Borkmann if (!addr_param_needed && addr_param_seen) 31949de7922bSDaniel Borkmann return false; 31959de7922bSDaniel Borkmann if (param.v != chunk->chunk_end) 31969de7922bSDaniel Borkmann return false; 31976f4c618dSWei Yongjun 31989de7922bSDaniel Borkmann return true; 31996f4c618dSWei Yongjun } 32006f4c618dSWei Yongjun 32011da177e4SLinus Torvalds /* Process an incoming ASCONF chunk with the next expected serial no. and 32021da177e4SLinus Torvalds * return an ASCONF_ACK chunk to be sent in response. 32031da177e4SLinus Torvalds */ 32041da177e4SLinus Torvalds struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, 32051da177e4SLinus Torvalds struct sctp_chunk *asconf) 32061da177e4SLinus Torvalds { 32071da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3208327c0dabSXin Long struct sctp_addip_chunk *addip; 32091da177e4SLinus Torvalds struct sctp_chunk *asconf_ack; 3210327c0dabSXin Long bool all_param_pass = true; 3211327c0dabSXin Long struct sctp_addiphdr *hdr; 3212327c0dabSXin Long int length = 0, chunk_len; 3213327c0dabSXin Long union sctp_params param; 3214dbc16db1SAl Viro __be16 err_code; 32151da177e4SLinus Torvalds __u32 serial; 32161da177e4SLinus Torvalds 321768d75469SXin Long addip = (struct sctp_addip_chunk *)asconf->chunk_hdr; 3218922dbc5bSXin Long chunk_len = ntohs(asconf->chunk_hdr->length) - 3219922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 322065205cc4SXin Long hdr = (struct sctp_addiphdr *)asconf->skb->data; 32211da177e4SLinus Torvalds serial = ntohl(hdr->serial); 32221da177e4SLinus Torvalds 32231da177e4SLinus Torvalds /* Skip the addiphdr and store a pointer to address parameter. */ 322465205cc4SXin Long length = sizeof(*hdr); 32251da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 32261da177e4SLinus Torvalds chunk_len -= length; 32271da177e4SLinus Torvalds 32281da177e4SLinus Torvalds /* Skip the address parameter and store a pointer to the first 32297aa1b54bSJoe Perches * asconf parameter. 32301da177e4SLinus Torvalds */ 32316a435732SShan Wei length = ntohs(addr_param->p.length); 32321da177e4SLinus Torvalds chunk_len -= length; 32331da177e4SLinus Torvalds 32341da177e4SLinus Torvalds /* create an ASCONF_ACK chunk. 32351da177e4SLinus Torvalds * Based on the definitions of parameters, we know that the size of 32362cab86beSWei Yongjun * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF 32377aa1b54bSJoe Perches * parameters. 32381da177e4SLinus Torvalds */ 32392cab86beSWei Yongjun asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); 32401da177e4SLinus Torvalds if (!asconf_ack) 32411da177e4SLinus Torvalds goto done; 32421da177e4SLinus Torvalds 32431da177e4SLinus Torvalds /* Process the TLVs contained within the ASCONF chunk. */ 32449de7922bSDaniel Borkmann sctp_walk_params(param, addip, addip_hdr.params) { 32459de7922bSDaniel Borkmann /* Skip preceeding address parameters. */ 32469de7922bSDaniel Borkmann if (param.p->type == SCTP_PARAM_IPV4_ADDRESS || 32479de7922bSDaniel Borkmann param.p->type == SCTP_PARAM_IPV6_ADDRESS) 32489de7922bSDaniel Borkmann continue; 32499de7922bSDaniel Borkmann 32501da177e4SLinus Torvalds err_code = sctp_process_asconf_param(asoc, asconf, 32519de7922bSDaniel Borkmann param.addip); 32521da177e4SLinus Torvalds /* ADDIP 4.1 A7) 32531da177e4SLinus Torvalds * If an error response is received for a TLV parameter, 32541da177e4SLinus Torvalds * all TLVs with no response before the failed TLV are 32551da177e4SLinus Torvalds * considered successful if not reported. All TLVs after 32561da177e4SLinus Torvalds * the failed response are considered unsuccessful unless 32571da177e4SLinus Torvalds * a specific success indication is present for the parameter. 32581da177e4SLinus Torvalds */ 32599de7922bSDaniel Borkmann if (err_code != SCTP_ERROR_NO_ERROR) 32609de7922bSDaniel Borkmann all_param_pass = false; 32611da177e4SLinus Torvalds if (!all_param_pass) 32629de7922bSDaniel Borkmann sctp_add_asconf_response(asconf_ack, param.addip->crr_id, 32639de7922bSDaniel Borkmann err_code, param.addip); 32641da177e4SLinus Torvalds 32651da177e4SLinus Torvalds /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add 32661da177e4SLinus Torvalds * an IP address sends an 'Out of Resource' in its response, it 32671da177e4SLinus Torvalds * MUST also fail any subsequent add or delete requests bundled 32681da177e4SLinus Torvalds * in the ASCONF. 32691da177e4SLinus Torvalds */ 32709de7922bSDaniel Borkmann if (err_code == SCTP_ERROR_RSRC_LOW) 32711da177e4SLinus Torvalds goto done; 32721da177e4SLinus Torvalds } 32731da177e4SLinus Torvalds done: 32741da177e4SLinus Torvalds asoc->peer.addip_serial++; 32751da177e4SLinus Torvalds 32761da177e4SLinus Torvalds /* If we are sending a new ASCONF_ACK hold a reference to it in assoc 32771da177e4SLinus Torvalds * after freeing the reference to old asconf ack if any. 32781da177e4SLinus Torvalds */ 32791da177e4SLinus Torvalds if (asconf_ack) { 32801da177e4SLinus Torvalds sctp_chunk_hold(asconf_ack); 3281a08de64dSVlad Yasevich list_add_tail(&asconf_ack->transmitted_list, 3282a08de64dSVlad Yasevich &asoc->asconf_ack_list); 32831da177e4SLinus Torvalds } 32841da177e4SLinus Torvalds 32851da177e4SLinus Torvalds return asconf_ack; 32861da177e4SLinus Torvalds } 32871da177e4SLinus Torvalds 32881da177e4SLinus Torvalds /* Process a asconf parameter that is successfully acked. */ 3289425e0f68SWei Yongjun static void sctp_asconf_param_success(struct sctp_association *asoc, 32908b32f234SXin Long struct sctp_addip_param *asconf_param) 32911da177e4SLinus Torvalds { 32921da177e4SLinus Torvalds struct sctp_bind_addr *bp = &asoc->base.bind_addr; 32931da177e4SLinus Torvalds union sctp_addr_param *addr_param; 3294dc022a98SSridhar Samudrala struct sctp_sockaddr_entry *saddr; 3295327c0dabSXin Long struct sctp_transport *transport; 3296327c0dabSXin Long union sctp_addr addr; 3297327c0dabSXin Long struct sctp_af *af; 32981da177e4SLinus Torvalds 32998b32f234SXin Long addr_param = (void *)asconf_param + sizeof(*asconf_param); 33001da177e4SLinus Torvalds 33011da177e4SLinus Torvalds /* We have checked the packet before, so we do not check again. */ 33026a435732SShan Wei af = sctp_get_af_specific(param_type2af(addr_param->p.type)); 3303dd86d136SAl Viro af->from_addr_param(&addr, addr_param, htons(bp->port), 0); 33041da177e4SLinus Torvalds 33051da177e4SLinus Torvalds switch (asconf_param->param_hdr.type) { 33061da177e4SLinus Torvalds case SCTP_PARAM_ADD_IP: 3307559cf710SVlad Yasevich /* This is always done in BH context with a socket lock 3308559cf710SVlad Yasevich * held, so the list can not change. 3309559cf710SVlad Yasevich */ 33100ed90fb0SVlad Yasevich local_bh_disable(); 3311559cf710SVlad Yasevich list_for_each_entry(saddr, &bp->address_list, list) { 3312dd86d136SAl Viro if (sctp_cmp_addr_exact(&saddr->a, &addr)) 3313f57d96b2SVlad Yasevich saddr->state = SCTP_ADDR_SRC; 3314dc022a98SSridhar Samudrala } 33150ed90fb0SVlad Yasevich local_bh_enable(); 33163cd9749cSWei Yongjun list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33173cd9749cSWei Yongjun transports) { 3318c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33193cd9749cSWei Yongjun } 33201da177e4SLinus Torvalds break; 33211da177e4SLinus Torvalds case SCTP_PARAM_DEL_IP: 33220ed90fb0SVlad Yasevich local_bh_disable(); 3323425e0f68SWei Yongjun sctp_del_bind_addr(bp, &addr); 33248a07eb0aSMichio Honda if (asoc->asconf_addr_del_pending != NULL && 33258a07eb0aSMichio Honda sctp_cmp_addr_exact(asoc->asconf_addr_del_pending, &addr)) { 33268a07eb0aSMichio Honda kfree(asoc->asconf_addr_del_pending); 33278a07eb0aSMichio Honda asoc->asconf_addr_del_pending = NULL; 33288a07eb0aSMichio Honda } 33290ed90fb0SVlad Yasevich local_bh_enable(); 33309dbc15f0SRobert P. J. Day list_for_each_entry(transport, &asoc->peer.transport_addr_list, 33319dbc15f0SRobert P. J. Day transports) { 3332c86a773cSJulian Anastasov sctp_transport_dst_release(transport); 33331da177e4SLinus Torvalds } 33341da177e4SLinus Torvalds break; 33351da177e4SLinus Torvalds default: 33361da177e4SLinus Torvalds break; 33371da177e4SLinus Torvalds } 33381da177e4SLinus Torvalds } 33391da177e4SLinus Torvalds 33401da177e4SLinus Torvalds /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk 33411da177e4SLinus Torvalds * for the given asconf parameter. If there is no response for this parameter, 33421da177e4SLinus Torvalds * return the error code based on the third argument 'no_err'. 33431da177e4SLinus Torvalds * ADDIP 4.1 33441da177e4SLinus Torvalds * A7) If an error response is received for a TLV parameter, all TLVs with no 33451da177e4SLinus Torvalds * response before the failed TLV are considered successful if not reported. 33461da177e4SLinus Torvalds * All TLVs after the failed response are considered unsuccessful unless a 33471da177e4SLinus Torvalds * specific success indication is present for the parameter. 33481da177e4SLinus Torvalds */ 3349dbc16db1SAl Viro static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack, 33508b32f234SXin Long struct sctp_addip_param *asconf_param, 33511da177e4SLinus Torvalds int no_err) 33521da177e4SLinus Torvalds { 33538b32f234SXin Long struct sctp_addip_param *asconf_ack_param; 3354d8238d9dSXin Long struct sctp_errhdr *err_param; 3355f3830cccSWei Yongjun int asconf_ack_len; 3356dbc16db1SAl Viro __be16 err_code; 3357327c0dabSXin Long int length; 33581da177e4SLinus Torvalds 33591da177e4SLinus Torvalds if (no_err) 33601da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 33611da177e4SLinus Torvalds else 33621da177e4SLinus Torvalds err_code = SCTP_ERROR_REQ_REFUSED; 33631da177e4SLinus Torvalds 3364f3830cccSWei Yongjun asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) - 3365922dbc5bSXin Long sizeof(struct sctp_chunkhdr); 3366f3830cccSWei Yongjun 33671da177e4SLinus Torvalds /* Skip the addiphdr from the asconf_ack chunk and store a pointer to 33681da177e4SLinus Torvalds * the first asconf_ack parameter. 33691da177e4SLinus Torvalds */ 337065205cc4SXin Long length = sizeof(struct sctp_addiphdr); 33718b32f234SXin Long asconf_ack_param = (struct sctp_addip_param *)(asconf_ack->skb->data + 33721da177e4SLinus Torvalds length); 33731da177e4SLinus Torvalds asconf_ack_len -= length; 33741da177e4SLinus Torvalds 33751da177e4SLinus Torvalds while (asconf_ack_len > 0) { 33761da177e4SLinus Torvalds if (asconf_ack_param->crr_id == asconf_param->crr_id) { 33771da177e4SLinus Torvalds switch (asconf_ack_param->param_hdr.type) { 33781da177e4SLinus Torvalds case SCTP_PARAM_SUCCESS_REPORT: 33791da177e4SLinus Torvalds return SCTP_ERROR_NO_ERROR; 33801da177e4SLinus Torvalds case SCTP_PARAM_ERR_CAUSE: 33818b32f234SXin Long length = sizeof(*asconf_ack_param); 3382ea110733SJoe Perches err_param = (void *)asconf_ack_param + length; 33831da177e4SLinus Torvalds asconf_ack_len -= length; 33841da177e4SLinus Torvalds if (asconf_ack_len > 0) 33851da177e4SLinus Torvalds return err_param->cause; 33861da177e4SLinus Torvalds else 33871da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33881da177e4SLinus Torvalds break; 33891da177e4SLinus Torvalds default: 33901da177e4SLinus Torvalds return SCTP_ERROR_INV_PARAM; 33911da177e4SLinus Torvalds } 33921da177e4SLinus Torvalds } 33931da177e4SLinus Torvalds 33941da177e4SLinus Torvalds length = ntohs(asconf_ack_param->param_hdr.length); 3395ea110733SJoe Perches asconf_ack_param = (void *)asconf_ack_param + length; 33961da177e4SLinus Torvalds asconf_ack_len -= length; 33971da177e4SLinus Torvalds } 33981da177e4SLinus Torvalds 33991da177e4SLinus Torvalds return err_code; 34001da177e4SLinus Torvalds } 34011da177e4SLinus Torvalds 34021da177e4SLinus Torvalds /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */ 34031da177e4SLinus Torvalds int sctp_process_asconf_ack(struct sctp_association *asoc, 34041da177e4SLinus Torvalds struct sctp_chunk *asconf_ack) 34051da177e4SLinus Torvalds { 34061da177e4SLinus Torvalds struct sctp_chunk *asconf = asoc->addip_last_asconf; 34078b32f234SXin Long struct sctp_addip_param *asconf_param; 3408327c0dabSXin Long __be16 err_code = SCTP_ERROR_NO_ERROR; 3409327c0dabSXin Long union sctp_addr_param *addr_param; 34101da177e4SLinus Torvalds int asconf_len = asconf->skb->len; 34111da177e4SLinus Torvalds int all_param_pass = 0; 3412327c0dabSXin Long int length = 0; 34131da177e4SLinus Torvalds int no_err = 1; 34141da177e4SLinus Torvalds int retval = 0; 34151da177e4SLinus Torvalds 34161da177e4SLinus Torvalds /* Skip the chunkhdr and addiphdr from the last asconf sent and store 34171da177e4SLinus Torvalds * a pointer to address parameter. 34181da177e4SLinus Torvalds */ 341968d75469SXin Long length = sizeof(struct sctp_addip_chunk); 34201da177e4SLinus Torvalds addr_param = (union sctp_addr_param *)(asconf->skb->data + length); 34211da177e4SLinus Torvalds asconf_len -= length; 34221da177e4SLinus Torvalds 34231da177e4SLinus Torvalds /* Skip the address parameter in the last asconf sent and store a 34247aa1b54bSJoe Perches * pointer to the first asconf parameter. 34251da177e4SLinus Torvalds */ 34266a435732SShan Wei length = ntohs(addr_param->p.length); 3427ea110733SJoe Perches asconf_param = (void *)addr_param + length; 34281da177e4SLinus Torvalds asconf_len -= length; 34291da177e4SLinus Torvalds 34301da177e4SLinus Torvalds /* ADDIP 4.1 34311da177e4SLinus Torvalds * A8) If there is no response(s) to specific TLV parameter(s), and no 34321da177e4SLinus Torvalds * failures are indicated, then all request(s) are considered 34331da177e4SLinus Torvalds * successful. 34341da177e4SLinus Torvalds */ 343565205cc4SXin Long if (asconf_ack->skb->len == sizeof(struct sctp_addiphdr)) 34361da177e4SLinus Torvalds all_param_pass = 1; 34371da177e4SLinus Torvalds 34381da177e4SLinus Torvalds /* Process the TLVs contained in the last sent ASCONF chunk. */ 34391da177e4SLinus Torvalds while (asconf_len > 0) { 34401da177e4SLinus Torvalds if (all_param_pass) 34411da177e4SLinus Torvalds err_code = SCTP_ERROR_NO_ERROR; 34421da177e4SLinus Torvalds else { 34431da177e4SLinus Torvalds err_code = sctp_get_asconf_response(asconf_ack, 34441da177e4SLinus Torvalds asconf_param, 34451da177e4SLinus Torvalds no_err); 34461da177e4SLinus Torvalds if (no_err && (SCTP_ERROR_NO_ERROR != err_code)) 34471da177e4SLinus Torvalds no_err = 0; 34481da177e4SLinus Torvalds } 34491da177e4SLinus Torvalds 34501da177e4SLinus Torvalds switch (err_code) { 34511da177e4SLinus Torvalds case SCTP_ERROR_NO_ERROR: 3452425e0f68SWei Yongjun sctp_asconf_param_success(asoc, asconf_param); 34531da177e4SLinus Torvalds break; 34541da177e4SLinus Torvalds 34551da177e4SLinus Torvalds case SCTP_ERROR_RSRC_LOW: 34561da177e4SLinus Torvalds retval = 1; 34571da177e4SLinus Torvalds break; 34581da177e4SLinus Torvalds 3459a987f762SWei Yongjun case SCTP_ERROR_UNKNOWN_PARAM: 34601da177e4SLinus Torvalds /* Disable sending this type of asconf parameter in 34611da177e4SLinus Torvalds * future. 34621da177e4SLinus Torvalds */ 34631da177e4SLinus Torvalds asoc->peer.addip_disabled_mask |= 34641da177e4SLinus Torvalds asconf_param->param_hdr.type; 34651da177e4SLinus Torvalds break; 34661da177e4SLinus Torvalds 34671da177e4SLinus Torvalds case SCTP_ERROR_REQ_REFUSED: 34681da177e4SLinus Torvalds case SCTP_ERROR_DEL_LAST_IP: 34691da177e4SLinus Torvalds case SCTP_ERROR_DEL_SRC_IP: 34701da177e4SLinus Torvalds default: 34711da177e4SLinus Torvalds break; 34721da177e4SLinus Torvalds } 34731da177e4SLinus Torvalds 34741da177e4SLinus Torvalds /* Skip the processed asconf parameter and move to the next 34751da177e4SLinus Torvalds * one. 34761da177e4SLinus Torvalds */ 34771da177e4SLinus Torvalds length = ntohs(asconf_param->param_hdr.length); 3478ea110733SJoe Perches asconf_param = (void *)asconf_param + length; 34791da177e4SLinus Torvalds asconf_len -= length; 34801da177e4SLinus Torvalds } 34811da177e4SLinus Torvalds 3482ddc4bbeeSMichio Honda if (no_err && asoc->src_out_of_asoc_ok) { 34838a07eb0aSMichio Honda asoc->src_out_of_asoc_ok = 0; 3484ddc4bbeeSMichio Honda sctp_transport_immediate_rtx(asoc->peer.primary_path); 3485ddc4bbeeSMichio Honda } 34868a07eb0aSMichio Honda 34871da177e4SLinus Torvalds /* Free the cached last sent asconf chunk. */ 34885f9646c3SVlad Yasevich list_del_init(&asconf->transmitted_list); 34891da177e4SLinus Torvalds sctp_chunk_free(asconf); 34901da177e4SLinus Torvalds asoc->addip_last_asconf = NULL; 34911da177e4SLinus Torvalds 34921da177e4SLinus Torvalds return retval; 34931da177e4SLinus Torvalds } 34941da177e4SLinus Torvalds 34951da177e4SLinus Torvalds /* Make a FWD TSN chunk. */ 34961da177e4SLinus Torvalds struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc, 34971da177e4SLinus Torvalds __u32 new_cum_tsn, size_t nstreams, 34981da177e4SLinus Torvalds struct sctp_fwdtsn_skip *skiplist) 34991da177e4SLinus Torvalds { 35001da177e4SLinus Torvalds struct sctp_chunk *retval = NULL; 35011da177e4SLinus Torvalds struct sctp_fwdtsn_hdr ftsn_hdr; 35021da177e4SLinus Torvalds struct sctp_fwdtsn_skip skip; 35031da177e4SLinus Torvalds size_t hint; 35041da177e4SLinus Torvalds int i; 35051da177e4SLinus Torvalds 35061da177e4SLinus Torvalds hint = (nstreams + 1) * sizeof(__u32); 35071da177e4SLinus Torvalds 3508cea8768fSMarcelo Ricardo Leitner retval = sctp_make_control(asoc, SCTP_CID_FWD_TSN, 0, hint, GFP_ATOMIC); 35091da177e4SLinus Torvalds 35101da177e4SLinus Torvalds if (!retval) 35111da177e4SLinus Torvalds return NULL; 35121da177e4SLinus Torvalds 35131da177e4SLinus Torvalds ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn); 35141da177e4SLinus Torvalds retval->subh.fwdtsn_hdr = 35151da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr); 35161da177e4SLinus Torvalds 35171da177e4SLinus Torvalds for (i = 0; i < nstreams; i++) { 35181da177e4SLinus Torvalds skip.stream = skiplist[i].stream; 35191da177e4SLinus Torvalds skip.ssn = skiplist[i].ssn; 35201da177e4SLinus Torvalds sctp_addto_chunk(retval, sizeof(skip), &skip); 35211da177e4SLinus Torvalds } 35221da177e4SLinus Torvalds 35231da177e4SLinus Torvalds return retval; 35241da177e4SLinus Torvalds } 3525cc16f00fSXin Long 3526cc16f00fSXin Long /* RE-CONFIG 3.1 (RE-CONFIG chunk) 3527cc16f00fSXin Long * 0 1 2 3 3528cc16f00fSXin Long * 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 3529cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3530cc16f00fSXin Long * | Type = 130 | Chunk Flags | Chunk Length | 3531cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3532cc16f00fSXin Long * \ \ 3533cc16f00fSXin Long * / Re-configuration Parameter / 3534cc16f00fSXin Long * \ \ 3535cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3536cc16f00fSXin Long * \ \ 3537cc16f00fSXin Long * / Re-configuration Parameter (optional) / 3538cc16f00fSXin Long * \ \ 3539cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3540cc16f00fSXin Long */ 3541327c0dabSXin Long static struct sctp_chunk *sctp_make_reconf(const struct sctp_association *asoc, 3542cc16f00fSXin Long int length) 3543cc16f00fSXin Long { 3544cc16f00fSXin Long struct sctp_reconf_chunk *reconf; 3545cc16f00fSXin Long struct sctp_chunk *retval; 3546cc16f00fSXin Long 3547cc16f00fSXin Long retval = sctp_make_control(asoc, SCTP_CID_RECONF, 0, length, 3548cc16f00fSXin Long GFP_ATOMIC); 3549cc16f00fSXin Long if (!retval) 3550cc16f00fSXin Long return NULL; 3551cc16f00fSXin Long 3552cc16f00fSXin Long reconf = (struct sctp_reconf_chunk *)retval->chunk_hdr; 3553cc16f00fSXin Long retval->param_hdr.v = reconf->params; 3554cc16f00fSXin Long 3555cc16f00fSXin Long return retval; 3556cc16f00fSXin Long } 3557cc16f00fSXin Long 3558cc16f00fSXin Long /* RE-CONFIG 4.1 (STREAM OUT RESET) 3559cc16f00fSXin Long * 0 1 2 3 3560cc16f00fSXin Long * 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 3561cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3562cc16f00fSXin Long * | Parameter Type = 13 | Parameter Length = 16 + 2 * N | 3563cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3564cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3565cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3566cc16f00fSXin Long * | Re-configuration Response Sequence Number | 3567cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3568cc16f00fSXin Long * | Sender's Last Assigned TSN | 3569cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3570cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3571cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3572cc16f00fSXin Long * / ...... / 3573cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3574cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3575cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3576cc16f00fSXin Long * 3577cc16f00fSXin Long * RE-CONFIG 4.2 (STREAM IN RESET) 3578cc16f00fSXin Long * 0 1 2 3 3579cc16f00fSXin Long * 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 3580cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3581cc16f00fSXin Long * | Parameter Type = 14 | Parameter Length = 8 + 2 * N | 3582cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3583cc16f00fSXin Long * | Re-configuration Request Sequence Number | 3584cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3585cc16f00fSXin Long * | Stream Number 1 (optional) | Stream Number 2 (optional) | 3586cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3587cc16f00fSXin Long * / ...... / 3588cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3589cc16f00fSXin Long * | Stream Number N-1 (optional) | Stream Number N (optional) | 3590cc16f00fSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3591cc16f00fSXin Long */ 3592cc16f00fSXin Long struct sctp_chunk *sctp_make_strreset_req( 3593cc16f00fSXin Long const struct sctp_association *asoc, 3594cc16f00fSXin Long __u16 stream_num, __u16 *stream_list, 3595cc16f00fSXin Long bool out, bool in) 3596cc16f00fSXin Long { 3597cc16f00fSXin Long struct sctp_strreset_outreq outreq; 3598cc16f00fSXin Long __u16 stream_len = stream_num * 2; 3599cc16f00fSXin Long struct sctp_strreset_inreq inreq; 3600cc16f00fSXin Long struct sctp_chunk *retval; 360116e1a919SXin Long __u16 outlen, inlen; 3602cc16f00fSXin Long 3603cc16f00fSXin Long outlen = (sizeof(outreq) + stream_len) * out; 3604cc16f00fSXin Long inlen = (sizeof(inreq) + stream_len) * in; 3605cc16f00fSXin Long 3606cc16f00fSXin Long retval = sctp_make_reconf(asoc, outlen + inlen); 3607cc16f00fSXin Long if (!retval) 3608cc16f00fSXin Long return NULL; 3609cc16f00fSXin Long 3610cc16f00fSXin Long if (outlen) { 3611cc16f00fSXin Long outreq.param_hdr.type = SCTP_PARAM_RESET_OUT_REQUEST; 3612cc16f00fSXin Long outreq.param_hdr.length = htons(outlen); 3613cc16f00fSXin Long outreq.request_seq = htonl(asoc->strreset_outseq); 3614cc16f00fSXin Long outreq.response_seq = htonl(asoc->strreset_inseq - 1); 3615cc16f00fSXin Long outreq.send_reset_at_tsn = htonl(asoc->next_tsn - 1); 3616cc16f00fSXin Long 3617cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(outreq), &outreq); 3618cc16f00fSXin Long 3619cc16f00fSXin Long if (stream_len) 3620cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3621cc16f00fSXin Long } 3622cc16f00fSXin Long 3623cc16f00fSXin Long if (inlen) { 3624cc16f00fSXin Long inreq.param_hdr.type = SCTP_PARAM_RESET_IN_REQUEST; 3625cc16f00fSXin Long inreq.param_hdr.length = htons(inlen); 3626cc16f00fSXin Long inreq.request_seq = htonl(asoc->strreset_outseq + out); 3627cc16f00fSXin Long 3628cc16f00fSXin Long sctp_addto_chunk(retval, sizeof(inreq), &inreq); 3629cc16f00fSXin Long 3630cc16f00fSXin Long if (stream_len) 3631cc16f00fSXin Long sctp_addto_chunk(retval, stream_len, stream_list); 3632cc16f00fSXin Long } 3633cc16f00fSXin Long 3634cc16f00fSXin Long return retval; 3635cc16f00fSXin Long } 3636c56480a1SXin Long 3637c56480a1SXin Long /* RE-CONFIG 4.3 (SSN/TSN RESET ALL) 3638c56480a1SXin Long * 0 1 2 3 3639c56480a1SXin Long * 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 3640c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3641c56480a1SXin Long * | Parameter Type = 15 | Parameter Length = 8 | 3642c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3643c56480a1SXin Long * | Re-configuration Request Sequence Number | 3644c56480a1SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3645c56480a1SXin Long */ 3646c56480a1SXin Long struct sctp_chunk *sctp_make_strreset_tsnreq( 3647c56480a1SXin Long const struct sctp_association *asoc) 3648c56480a1SXin Long { 3649c56480a1SXin Long struct sctp_strreset_tsnreq tsnreq; 3650c56480a1SXin Long __u16 length = sizeof(tsnreq); 3651c56480a1SXin Long struct sctp_chunk *retval; 3652c56480a1SXin Long 3653c56480a1SXin Long retval = sctp_make_reconf(asoc, length); 3654c56480a1SXin Long if (!retval) 3655c56480a1SXin Long return NULL; 3656c56480a1SXin Long 3657c56480a1SXin Long tsnreq.param_hdr.type = SCTP_PARAM_RESET_TSN_REQUEST; 3658c56480a1SXin Long tsnreq.param_hdr.length = htons(length); 3659c56480a1SXin Long tsnreq.request_seq = htonl(asoc->strreset_outseq); 3660c56480a1SXin Long 3661c56480a1SXin Long sctp_addto_chunk(retval, sizeof(tsnreq), &tsnreq); 3662c56480a1SXin Long 3663c56480a1SXin Long return retval; 3664c56480a1SXin Long } 366578098117SXin Long 366678098117SXin Long /* RE-CONFIG 4.5/4.6 (ADD STREAM) 366778098117SXin Long * 0 1 2 3 366878098117SXin Long * 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 366978098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 367078098117SXin Long * | Parameter Type = 17 | Parameter Length = 12 | 367178098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 367278098117SXin Long * | Re-configuration Request Sequence Number | 367378098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 367478098117SXin Long * | Number of new streams | Reserved | 367578098117SXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 367678098117SXin Long */ 367778098117SXin Long struct sctp_chunk *sctp_make_strreset_addstrm( 367878098117SXin Long const struct sctp_association *asoc, 367978098117SXin Long __u16 out, __u16 in) 368078098117SXin Long { 368178098117SXin Long struct sctp_strreset_addstrm addstrm; 368278098117SXin Long __u16 size = sizeof(addstrm); 368378098117SXin Long struct sctp_chunk *retval; 368478098117SXin Long 368578098117SXin Long retval = sctp_make_reconf(asoc, (!!out + !!in) * size); 368678098117SXin Long if (!retval) 368778098117SXin Long return NULL; 368878098117SXin Long 368978098117SXin Long if (out) { 369078098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_OUT_STREAMS; 369178098117SXin Long addstrm.param_hdr.length = htons(size); 369278098117SXin Long addstrm.number_of_streams = htons(out); 369378098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq); 369478098117SXin Long addstrm.reserved = 0; 369578098117SXin Long 369678098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 369778098117SXin Long } 369878098117SXin Long 369978098117SXin Long if (in) { 370078098117SXin Long addstrm.param_hdr.type = SCTP_PARAM_RESET_ADD_IN_STREAMS; 370178098117SXin Long addstrm.param_hdr.length = htons(size); 370278098117SXin Long addstrm.number_of_streams = htons(in); 370378098117SXin Long addstrm.request_seq = htonl(asoc->strreset_outseq + !!out); 370478098117SXin Long addstrm.reserved = 0; 370578098117SXin Long 370678098117SXin Long sctp_addto_chunk(retval, size, &addstrm); 370778098117SXin Long } 370878098117SXin Long 370978098117SXin Long return retval; 371078098117SXin Long } 3711bd4b9f8bSXin Long 3712bd4b9f8bSXin Long /* RE-CONFIG 4.4 (RESP) 3713bd4b9f8bSXin Long * 0 1 2 3 3714bd4b9f8bSXin Long * 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 3715bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3716bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3717bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3718bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3719bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3720bd4b9f8bSXin Long * | Result | 3721bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3722bd4b9f8bSXin Long */ 3723327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc, 3724bd4b9f8bSXin Long __u32 result, __u32 sn) 3725bd4b9f8bSXin Long { 3726bd4b9f8bSXin Long struct sctp_strreset_resp resp; 3727bd4b9f8bSXin Long __u16 length = sizeof(resp); 3728bd4b9f8bSXin Long struct sctp_chunk *retval; 3729bd4b9f8bSXin Long 3730bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3731bd4b9f8bSXin Long if (!retval) 3732bd4b9f8bSXin Long return NULL; 3733bd4b9f8bSXin Long 3734bd4b9f8bSXin Long resp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3735bd4b9f8bSXin Long resp.param_hdr.length = htons(length); 3736bd4b9f8bSXin Long resp.response_seq = htonl(sn); 3737bd4b9f8bSXin Long resp.result = htonl(result); 3738bd4b9f8bSXin Long 3739bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(resp), &resp); 3740bd4b9f8bSXin Long 3741bd4b9f8bSXin Long return retval; 3742bd4b9f8bSXin Long } 3743bd4b9f8bSXin Long 3744bd4b9f8bSXin Long /* RE-CONFIG 4.4 OPTIONAL (TSNRESP) 3745bd4b9f8bSXin Long * 0 1 2 3 3746bd4b9f8bSXin Long * 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 3747bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3748bd4b9f8bSXin Long * | Parameter Type = 16 | Parameter Length | 3749bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3750bd4b9f8bSXin Long * | Re-configuration Response Sequence Number | 3751bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3752bd4b9f8bSXin Long * | Result | 3753bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3754bd4b9f8bSXin Long * | Sender's Next TSN (optional) | 3755bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3756bd4b9f8bSXin Long * | Receiver's Next TSN (optional) | 3757bd4b9f8bSXin Long * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 3758bd4b9f8bSXin Long */ 3759327c0dabSXin Long struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc, 3760bd4b9f8bSXin Long __u32 result, __u32 sn, 3761327c0dabSXin Long __u32 sender_tsn, 3762327c0dabSXin Long __u32 receiver_tsn) 3763bd4b9f8bSXin Long { 3764bd4b9f8bSXin Long struct sctp_strreset_resptsn tsnresp; 3765bd4b9f8bSXin Long __u16 length = sizeof(tsnresp); 3766bd4b9f8bSXin Long struct sctp_chunk *retval; 3767bd4b9f8bSXin Long 3768bd4b9f8bSXin Long retval = sctp_make_reconf(asoc, length); 3769bd4b9f8bSXin Long if (!retval) 3770bd4b9f8bSXin Long return NULL; 3771bd4b9f8bSXin Long 3772bd4b9f8bSXin Long tsnresp.param_hdr.type = SCTP_PARAM_RESET_RESPONSE; 3773bd4b9f8bSXin Long tsnresp.param_hdr.length = htons(length); 3774bd4b9f8bSXin Long 3775bd4b9f8bSXin Long tsnresp.response_seq = htonl(sn); 3776bd4b9f8bSXin Long tsnresp.result = htonl(result); 3777bd4b9f8bSXin Long tsnresp.senders_next_tsn = htonl(sender_tsn); 3778bd4b9f8bSXin Long tsnresp.receivers_next_tsn = htonl(receiver_tsn); 3779bd4b9f8bSXin Long 3780bd4b9f8bSXin Long sctp_addto_chunk(retval, sizeof(tsnresp), &tsnresp); 3781bd4b9f8bSXin Long 3782bd4b9f8bSXin Long return retval; 3783bd4b9f8bSXin Long } 3784ea625043SXin Long 3785ea625043SXin Long bool sctp_verify_reconf(const struct sctp_association *asoc, 3786ea625043SXin Long struct sctp_chunk *chunk, 3787ea625043SXin Long struct sctp_paramhdr **errp) 3788ea625043SXin Long { 3789ea625043SXin Long struct sctp_reconf_chunk *hdr; 3790ea625043SXin Long union sctp_params param; 3791ea625043SXin Long __u16 last = 0, cnt = 0; 3792ea625043SXin Long 3793ea625043SXin Long hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; 3794ea625043SXin Long sctp_walk_params(param, hdr, params) { 3795ea625043SXin Long __u16 length = ntohs(param.p->length); 3796ea625043SXin Long 3797ea625043SXin Long *errp = param.p; 3798ea625043SXin Long if (cnt++ > 2) 3799ea625043SXin Long return false; 3800ea625043SXin Long switch (param.p->type) { 3801ea625043SXin Long case SCTP_PARAM_RESET_OUT_REQUEST: 3802ea625043SXin Long if (length < sizeof(struct sctp_strreset_outreq) || 3803ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3804ea625043SXin Long last != SCTP_PARAM_RESET_IN_REQUEST)) 3805ea625043SXin Long return false; 3806ea625043SXin Long break; 3807ea625043SXin Long case SCTP_PARAM_RESET_IN_REQUEST: 3808ea625043SXin Long if (length < sizeof(struct sctp_strreset_inreq) || 3809ea625043SXin Long (last && last != SCTP_PARAM_RESET_OUT_REQUEST)) 3810ea625043SXin Long return false; 3811ea625043SXin Long break; 3812ea625043SXin Long case SCTP_PARAM_RESET_RESPONSE: 3813ea625043SXin Long if ((length != sizeof(struct sctp_strreset_resp) && 3814ea625043SXin Long length != sizeof(struct sctp_strreset_resptsn)) || 3815ea625043SXin Long (last && last != SCTP_PARAM_RESET_RESPONSE && 3816ea625043SXin Long last != SCTP_PARAM_RESET_OUT_REQUEST)) 3817ea625043SXin Long return false; 3818ea625043SXin Long break; 3819ea625043SXin Long case SCTP_PARAM_RESET_TSN_REQUEST: 3820ea625043SXin Long if (length != 3821ea625043SXin Long sizeof(struct sctp_strreset_tsnreq) || last) 3822ea625043SXin Long return false; 3823ea625043SXin Long break; 3824ea625043SXin Long case SCTP_PARAM_RESET_ADD_IN_STREAMS: 3825ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3826ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS)) 3827ea625043SXin Long return false; 3828ea625043SXin Long break; 3829ea625043SXin Long case SCTP_PARAM_RESET_ADD_OUT_STREAMS: 3830ea625043SXin Long if (length != sizeof(struct sctp_strreset_addstrm) || 3831ea625043SXin Long (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS)) 3832ea625043SXin Long return false; 3833ea625043SXin Long break; 3834ea625043SXin Long default: 3835ea625043SXin Long return false; 3836ea625043SXin Long } 3837ea625043SXin Long 3838ea625043SXin Long last = param.p->type; 3839ea625043SXin Long } 3840ea625043SXin Long 3841ea625043SXin Long return true; 3842ea625043SXin Long } 3843