1 |
1275 |
phoenix |
/* SCTP kernel reference Implementation
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* (C) Copyright IBM Corp. 2001, 2003
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 2001-2002 Intel Corp.
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*
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* This file is part of the SCTP kernel reference Implementation
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*
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* This file includes part of the implementation of the add-IP extension,
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* based on <draft-ietf-tsvwg-addip-sctp-02.txt> June 29, 2001,
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* for the SCTP kernel reference Implementation.
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*
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* These functions work with the state functions in sctp_sm_statefuns.c
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* to implement the state operations. These functions implement the
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* steps which require modifying existing data structures.
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*
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* The SCTP reference implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* The SCTP reference implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <lksctp-developers@lists.sourceforge.net>
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*
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* Or submit a bug report through the following website:
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* http://www.sf.net/projects/lksctp
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*
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* Written or modified by:
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Karl Knutson <karl@athena.chicago.il.us>
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44 |
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* C. Robin <chris@hundredacre.ac.uk>
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45 |
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* Jon Grimm <jgrimm@us.ibm.com>
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46 |
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* Xingang Guo <xingang.guo@intel.com>
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47 |
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* Dajiang Zhang <dajiang.zhang@nokia.com>
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* Sridhar Samudrala <sri@us.ibm.com>
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* Daisy Chang <daisyc@us.ibm.com>
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50 |
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* Ardelle Fan <ardelle.fan@intel.com>
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51 |
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* Kevin Gao <kevin.gao@intel.com>
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52 |
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*
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53 |
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* Any bugs reported given to us we will try to fix... any fixes shared will
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* be incorporated into the next SCTP release.
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*/
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#include <linux/types.h>
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58 |
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#include <linux/kernel.h>
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59 |
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#include <linux/ip.h>
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60 |
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#include <linux/ipv6.h>
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61 |
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#include <linux/net.h>
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62 |
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#include <linux/inet.h>
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63 |
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#include <asm/scatterlist.h>
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64 |
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#include <linux/crypto.h>
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65 |
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#include <net/sock.h>
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66 |
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67 |
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#include <linux/skbuff.h>
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68 |
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#include <linux/random.h> /* for get_random_bytes */
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69 |
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#include <net/sctp/sctp.h>
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70 |
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#include <net/sctp/sm.h>
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71 |
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72 |
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extern kmem_cache_t *sctp_chunk_cachep;
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73 |
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74 |
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/* What was the inbound interface for this chunk? */
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75 |
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int sctp_chunk_iif(const struct sctp_chunk *chunk)
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76 |
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{
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77 |
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struct sctp_af *af;
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78 |
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int iif = 0;
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79 |
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80 |
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af = sctp_get_af_specific(ipver2af(chunk->skb->nh.iph->version));
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81 |
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if (af)
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82 |
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iif = af->skb_iif(chunk->skb);
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83 |
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84 |
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return iif;
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85 |
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}
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86 |
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87 |
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/* RFC 2960 3.3.2 Initiation (INIT) (1)
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88 |
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*
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89 |
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* Note 2: The ECN capable field is reserved for future use of
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90 |
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* Explicit Congestion Notification.
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91 |
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*/
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92 |
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static const sctp_ecn_capable_param_t ecap_param = {
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93 |
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{
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94 |
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SCTP_PARAM_ECN_CAPABLE,
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95 |
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__constant_htons(sizeof(sctp_ecn_capable_param_t)),
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96 |
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}
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97 |
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};
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98 |
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|
99 |
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/* A helper to initialize to initialize an op error inside a
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100 |
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* provided chunk, as most cause codes will be embedded inside an
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101 |
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* abort chunk.
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102 |
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*/
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103 |
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void sctp_init_cause(struct sctp_chunk *chunk, __u16 cause_code,
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104 |
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const void *payload, size_t paylen)
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105 |
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{
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106 |
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sctp_errhdr_t err;
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107 |
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int padlen;
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108 |
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__u16 len;
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109 |
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110 |
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/* Cause code constants are now defined in network order. */
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111 |
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err.cause = cause_code;
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112 |
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len = sizeof(sctp_errhdr_t) + paylen;
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113 |
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padlen = len % 4;
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114 |
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err.length = htons(len);
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115 |
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len += padlen;
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116 |
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sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
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117 |
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chunk->subh.err_hdr = sctp_addto_chunk(chunk, paylen, payload);
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118 |
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}
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119 |
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120 |
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/* 3.3.2 Initiation (INIT) (1)
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121 |
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*
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122 |
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* This chunk is used to initiate a SCTP association between two
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123 |
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* endpoints. The format of the INIT chunk is shown below:
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124 |
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*
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125 |
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* 0 1 2 3
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126 |
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* 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
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127 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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128 |
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* | Type = 1 | Chunk Flags | Chunk Length |
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129 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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130 |
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* | Initiate Tag |
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131 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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132 |
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* | Advertised Receiver Window Credit (a_rwnd) |
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133 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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134 |
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* | Number of Outbound Streams | Number of Inbound Streams |
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135 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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136 |
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* | Initial TSN |
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137 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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138 |
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* \ \
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139 |
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* / Optional/Variable-Length Parameters /
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140 |
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* \ \
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141 |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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142 |
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*
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143 |
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*
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144 |
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* The INIT chunk contains the following parameters. Unless otherwise
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* noted, each parameter MUST only be included once in the INIT chunk.
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*
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147 |
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* Fixed Parameters Status
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* ----------------------------------------------
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149 |
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* Initiate Tag Mandatory
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* Advertised Receiver Window Credit Mandatory
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* Number of Outbound Streams Mandatory
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* Number of Inbound Streams Mandatory
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* Initial TSN Mandatory
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*
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* Variable Parameters Status Type Value
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* -------------------------------------------------------------
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157 |
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* IPv4 Address (Note 1) Optional 5
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158 |
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* IPv6 Address (Note 1) Optional 6
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* Cookie Preservative Optional 9
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160 |
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* Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
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* Host Name Address (Note 3) Optional 11
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* Supported Address Types (Note 4) Optional 12
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*/
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164 |
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struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
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165 |
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const struct sctp_bind_addr *bp,
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int gfp, int vparam_len)
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{
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sctp_inithdr_t init;
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union sctp_params addrs;
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170 |
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size_t chunksize;
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171 |
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struct sctp_chunk *retval = NULL;
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int num_types, addrs_len = 0;
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struct sctp_opt *sp;
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sctp_supported_addrs_param_t sat;
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__u16 types[2];
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/* RFC 2960 3.3.2 Initiation (INIT) (1)
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*
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179 |
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* Note 1: The INIT chunks can contain multiple addresses that
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180 |
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* can be IPv4 and/or IPv6 in any combination.
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181 |
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*/
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182 |
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retval = NULL;
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183 |
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184 |
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/* Convert the provided bind address list to raw format. */
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185 |
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addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
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186 |
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187 |
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init.init_tag = htonl(asoc->c.my_vtag);
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188 |
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init.a_rwnd = htonl(asoc->rwnd);
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189 |
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init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
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190 |
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init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
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191 |
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init.initial_tsn = htonl(asoc->c.initial_tsn);
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192 |
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|
193 |
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/* How many address types are needed? */
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194 |
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sp = sctp_sk(asoc->base.sk);
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195 |
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num_types = sp->pf->supported_addrs(sp, types);
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196 |
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|
197 |
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chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types);
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198 |
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chunksize += sizeof(ecap_param);
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199 |
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chunksize += vparam_len;
|
200 |
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|
201 |
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/* RFC 2960 3.3.2 Initiation (INIT) (1)
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202 |
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*
|
203 |
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* Note 3: An INIT chunk MUST NOT contain more than one Host
|
204 |
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* Name address parameter. Moreover, the sender of the INIT
|
205 |
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* MUST NOT combine any other address types with the Host Name
|
206 |
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* address in the INIT. The receiver of INIT MUST ignore any
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207 |
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* other address types if the Host Name address parameter is
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208 |
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* present in the received INIT chunk.
|
209 |
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*
|
210 |
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* PLEASE DO NOT FIXME [This version does not support Host Name.]
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211 |
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*/
|
212 |
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|
213 |
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retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize);
|
214 |
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if (!retval)
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215 |
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goto nodata;
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216 |
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|
217 |
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retval->subh.init_hdr =
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218 |
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sctp_addto_chunk(retval, sizeof(init), &init);
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219 |
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retval->param_hdr.v =
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220 |
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sctp_addto_chunk(retval, addrs_len, addrs.v);
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221 |
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|
222 |
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/* RFC 2960 3.3.2 Initiation (INIT) (1)
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223 |
|
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*
|
224 |
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* Note 4: This parameter, when present, specifies all the
|
225 |
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* address types the sending endpoint can support. The absence
|
226 |
|
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* of this parameter indicates that the sending endpoint can
|
227 |
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* support any address type.
|
228 |
|
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*/
|
229 |
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sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
|
230 |
|
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sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
|
231 |
|
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sctp_addto_chunk(retval, sizeof(sat), &sat);
|
232 |
|
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sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
|
233 |
|
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|
234 |
|
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sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
|
235 |
|
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nodata:
|
236 |
|
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if (addrs.v)
|
237 |
|
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kfree(addrs.v);
|
238 |
|
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return retval;
|
239 |
|
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}
|
240 |
|
|
|
241 |
|
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struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
|
242 |
|
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const struct sctp_chunk *chunk,
|
243 |
|
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int gfp, int unkparam_len)
|
244 |
|
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{
|
245 |
|
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sctp_inithdr_t initack;
|
246 |
|
|
struct sctp_chunk *retval;
|
247 |
|
|
union sctp_params addrs;
|
248 |
|
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int addrs_len;
|
249 |
|
|
sctp_cookie_param_t *cookie;
|
250 |
|
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int cookie_len;
|
251 |
|
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size_t chunksize;
|
252 |
|
|
|
253 |
|
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retval = NULL;
|
254 |
|
|
|
255 |
|
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/* Note: there may be no addresses to embed. */
|
256 |
|
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addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
|
257 |
|
|
|
258 |
|
|
initack.init_tag = htonl(asoc->c.my_vtag);
|
259 |
|
|
initack.a_rwnd = htonl(asoc->rwnd);
|
260 |
|
|
initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
|
261 |
|
|
initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
|
262 |
|
|
initack.initial_tsn = htonl(asoc->c.initial_tsn);
|
263 |
|
|
|
264 |
|
|
/* FIXME: We really ought to build the cookie right
|
265 |
|
|
* into the packet instead of allocating more fresh memory.
|
266 |
|
|
*/
|
267 |
|
|
cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
|
268 |
|
|
addrs.v, addrs_len);
|
269 |
|
|
if (!cookie)
|
270 |
|
|
goto nomem_cookie;
|
271 |
|
|
|
272 |
|
|
/* Calculate the total size of allocation, include the reserved
|
273 |
|
|
* space for reporting unknown parameters if it is specified.
|
274 |
|
|
*/
|
275 |
|
|
chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
|
276 |
|
|
|
277 |
|
|
/* Tell peer that we'll do ECN only if peer advertised such cap. */
|
278 |
|
|
if (asoc->peer.ecn_capable)
|
279 |
|
|
chunksize += sizeof(ecap_param);
|
280 |
|
|
|
281 |
|
|
/* Now allocate and fill out the chunk. */
|
282 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
|
283 |
|
|
if (!retval)
|
284 |
|
|
goto nomem_chunk;
|
285 |
|
|
|
286 |
|
|
/* Per the advice in RFC 2960 6.4, send this reply to
|
287 |
|
|
* the source of the INIT packet.
|
288 |
|
|
*/
|
289 |
|
|
retval->transport = chunk->transport;
|
290 |
|
|
retval->subh.init_hdr =
|
291 |
|
|
sctp_addto_chunk(retval, sizeof(initack), &initack);
|
292 |
|
|
retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
|
293 |
|
|
sctp_addto_chunk(retval, cookie_len, cookie);
|
294 |
|
|
if (asoc->peer.ecn_capable)
|
295 |
|
|
sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
|
296 |
|
|
|
297 |
|
|
/* We need to remove the const qualifier at this point. */
|
298 |
|
|
retval->asoc = (struct sctp_association *) asoc;
|
299 |
|
|
|
300 |
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
301 |
|
|
*
|
302 |
|
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
303 |
|
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
304 |
|
|
* address from which it received the DATA or control chunk
|
305 |
|
|
* to which it is replying.
|
306 |
|
|
*
|
307 |
|
|
* [INIT ACK back to where the INIT came from.]
|
308 |
|
|
*/
|
309 |
|
|
if (chunk)
|
310 |
|
|
retval->transport = chunk->transport;
|
311 |
|
|
|
312 |
|
|
nomem_chunk:
|
313 |
|
|
kfree(cookie);
|
314 |
|
|
nomem_cookie:
|
315 |
|
|
if (addrs.v)
|
316 |
|
|
kfree(addrs.v);
|
317 |
|
|
return retval;
|
318 |
|
|
}
|
319 |
|
|
|
320 |
|
|
/* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
|
321 |
|
|
*
|
322 |
|
|
* This chunk is used only during the initialization of an association.
|
323 |
|
|
* It is sent by the initiator of an association to its peer to complete
|
324 |
|
|
* the initialization process. This chunk MUST precede any DATA chunk
|
325 |
|
|
* sent within the association, but MAY be bundled with one or more DATA
|
326 |
|
|
* chunks in the same packet.
|
327 |
|
|
*
|
328 |
|
|
* 0 1 2 3
|
329 |
|
|
* 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
|
330 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
331 |
|
|
* | Type = 10 |Chunk Flags | Length |
|
332 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
333 |
|
|
* / Cookie /
|
334 |
|
|
* \ \
|
335 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
336 |
|
|
*
|
337 |
|
|
* Chunk Flags: 8 bit
|
338 |
|
|
*
|
339 |
|
|
* Set to zero on transmit and ignored on receipt.
|
340 |
|
|
*
|
341 |
|
|
* Length: 16 bits (unsigned integer)
|
342 |
|
|
*
|
343 |
|
|
* Set to the size of the chunk in bytes, including the 4 bytes of
|
344 |
|
|
* the chunk header and the size of the Cookie.
|
345 |
|
|
*
|
346 |
|
|
* Cookie: variable size
|
347 |
|
|
*
|
348 |
|
|
* This field must contain the exact cookie received in the
|
349 |
|
|
* State Cookie parameter from the previous INIT ACK.
|
350 |
|
|
*
|
351 |
|
|
* An implementation SHOULD make the cookie as small as possible
|
352 |
|
|
* to insure interoperability.
|
353 |
|
|
*/
|
354 |
|
|
struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
|
355 |
|
|
const struct sctp_chunk *chunk)
|
356 |
|
|
{
|
357 |
|
|
struct sctp_chunk *retval;
|
358 |
|
|
void *cookie;
|
359 |
|
|
int cookie_len;
|
360 |
|
|
|
361 |
|
|
cookie = asoc->peer.cookie;
|
362 |
|
|
cookie_len = asoc->peer.cookie_len;
|
363 |
|
|
|
364 |
|
|
/* Build a cookie echo chunk. */
|
365 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
|
366 |
|
|
if (!retval)
|
367 |
|
|
goto nodata;
|
368 |
|
|
retval->subh.cookie_hdr =
|
369 |
|
|
sctp_addto_chunk(retval, cookie_len, cookie);
|
370 |
|
|
|
371 |
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
372 |
|
|
*
|
373 |
|
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
374 |
|
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
375 |
|
|
* address from which it * received the DATA or control chunk
|
376 |
|
|
* to which it is replying.
|
377 |
|
|
*
|
378 |
|
|
* [COOKIE ECHO back to where the INIT ACK came from.]
|
379 |
|
|
*/
|
380 |
|
|
if (chunk)
|
381 |
|
|
retval->transport = chunk->transport;
|
382 |
|
|
|
383 |
|
|
nodata:
|
384 |
|
|
return retval;
|
385 |
|
|
}
|
386 |
|
|
|
387 |
|
|
/* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
|
388 |
|
|
*
|
389 |
|
|
* This chunk is used only during the initialization of an
|
390 |
|
|
* association. It is used to acknowledge the receipt of a COOKIE
|
391 |
|
|
* ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
|
392 |
|
|
* within the association, but MAY be bundled with one or more DATA
|
393 |
|
|
* chunks or SACK chunk in the same SCTP packet.
|
394 |
|
|
*
|
395 |
|
|
* 0 1 2 3
|
396 |
|
|
* 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
|
397 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
398 |
|
|
* | Type = 11 |Chunk Flags | Length = 4 |
|
399 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
400 |
|
|
*
|
401 |
|
|
* Chunk Flags: 8 bits
|
402 |
|
|
*
|
403 |
|
|
* Set to zero on transmit and ignored on receipt.
|
404 |
|
|
*/
|
405 |
|
|
struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
|
406 |
|
|
const struct sctp_chunk *chunk)
|
407 |
|
|
{
|
408 |
|
|
struct sctp_chunk *retval;
|
409 |
|
|
|
410 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
|
411 |
|
|
|
412 |
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
413 |
|
|
*
|
414 |
|
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
415 |
|
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
416 |
|
|
* address from which it * received the DATA or control chunk
|
417 |
|
|
* to which it is replying.
|
418 |
|
|
*
|
419 |
|
|
* [COOKIE ACK back to where the COOKIE ECHO came from.]
|
420 |
|
|
*/
|
421 |
|
|
if (retval && chunk)
|
422 |
|
|
retval->transport = chunk->transport;
|
423 |
|
|
|
424 |
|
|
return retval;
|
425 |
|
|
}
|
426 |
|
|
|
427 |
|
|
/*
|
428 |
|
|
* Appendix A: Explicit Congestion Notification:
|
429 |
|
|
* CWR:
|
430 |
|
|
*
|
431 |
|
|
* RFC 2481 details a specific bit for a sender to send in the header of
|
432 |
|
|
* its next outbound TCP segment to indicate to its peer that it has
|
433 |
|
|
* reduced its congestion window. This is termed the CWR bit. For
|
434 |
|
|
* SCTP the same indication is made by including the CWR chunk.
|
435 |
|
|
* This chunk contains one data element, i.e. the TSN number that
|
436 |
|
|
* was sent in the ECNE chunk. This element represents the lowest
|
437 |
|
|
* TSN number in the datagram that was originally marked with the
|
438 |
|
|
* CE bit.
|
439 |
|
|
*
|
440 |
|
|
* 0 1 2 3
|
441 |
|
|
* 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
|
442 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
443 |
|
|
* | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
|
444 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
445 |
|
|
* | Lowest TSN Number |
|
446 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
447 |
|
|
*
|
448 |
|
|
* Note: The CWR is considered a Control chunk.
|
449 |
|
|
*/
|
450 |
|
|
struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
|
451 |
|
|
const __u32 lowest_tsn,
|
452 |
|
|
const struct sctp_chunk *chunk)
|
453 |
|
|
{
|
454 |
|
|
struct sctp_chunk *retval;
|
455 |
|
|
sctp_cwrhdr_t cwr;
|
456 |
|
|
|
457 |
|
|
cwr.lowest_tsn = htonl(lowest_tsn);
|
458 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0,
|
459 |
|
|
sizeof(sctp_cwrhdr_t));
|
460 |
|
|
|
461 |
|
|
if (!retval)
|
462 |
|
|
goto nodata;
|
463 |
|
|
|
464 |
|
|
retval->subh.ecn_cwr_hdr =
|
465 |
|
|
sctp_addto_chunk(retval, sizeof(cwr), &cwr);
|
466 |
|
|
|
467 |
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
468 |
|
|
*
|
469 |
|
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
470 |
|
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
471 |
|
|
* address from which it * received the DATA or control chunk
|
472 |
|
|
* to which it is replying.
|
473 |
|
|
*
|
474 |
|
|
* [Report a reduced congestion window back to where the ECNE
|
475 |
|
|
* came from.]
|
476 |
|
|
*/
|
477 |
|
|
if (chunk)
|
478 |
|
|
retval->transport = chunk->transport;
|
479 |
|
|
|
480 |
|
|
nodata:
|
481 |
|
|
return retval;
|
482 |
|
|
}
|
483 |
|
|
|
484 |
|
|
/* Make an ECNE chunk. This is a congestion experienced report. */
|
485 |
|
|
struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
|
486 |
|
|
const __u32 lowest_tsn)
|
487 |
|
|
{
|
488 |
|
|
struct sctp_chunk *retval;
|
489 |
|
|
sctp_ecnehdr_t ecne;
|
490 |
|
|
|
491 |
|
|
ecne.lowest_tsn = htonl(lowest_tsn);
|
492 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0,
|
493 |
|
|
sizeof(sctp_ecnehdr_t));
|
494 |
|
|
if (!retval)
|
495 |
|
|
goto nodata;
|
496 |
|
|
retval->subh.ecne_hdr =
|
497 |
|
|
sctp_addto_chunk(retval, sizeof(ecne), &ecne);
|
498 |
|
|
|
499 |
|
|
nodata:
|
500 |
|
|
return retval;
|
501 |
|
|
}
|
502 |
|
|
|
503 |
|
|
/* Make a DATA chunk for the given association from the provided
|
504 |
|
|
* parameters. However, do not populate the data payload.
|
505 |
|
|
*/
|
506 |
|
|
struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
|
507 |
|
|
const struct sctp_sndrcvinfo *sinfo,
|
508 |
|
|
int data_len, __u8 flags, __u16 ssn)
|
509 |
|
|
{
|
510 |
|
|
struct sctp_chunk *retval;
|
511 |
|
|
struct sctp_datahdr dp;
|
512 |
|
|
int chunk_len;
|
513 |
|
|
|
514 |
|
|
/* We assign the TSN as LATE as possible, not here when
|
515 |
|
|
* creating the chunk.
|
516 |
|
|
*/
|
517 |
|
|
dp.tsn = 0;
|
518 |
|
|
dp.stream = htons(sinfo->sinfo_stream);
|
519 |
|
|
dp.ppid = sinfo->sinfo_ppid;
|
520 |
|
|
|
521 |
|
|
/* Set the flags for an unordered send. */
|
522 |
|
|
if (sinfo->sinfo_flags & MSG_UNORDERED) {
|
523 |
|
|
flags |= SCTP_DATA_UNORDERED;
|
524 |
|
|
dp.ssn = 0;
|
525 |
|
|
} else
|
526 |
|
|
dp.ssn = htons(ssn);
|
527 |
|
|
|
528 |
|
|
chunk_len = sizeof(dp) + data_len;
|
529 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len);
|
530 |
|
|
if (!retval)
|
531 |
|
|
goto nodata;
|
532 |
|
|
|
533 |
|
|
retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
|
534 |
|
|
memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
|
535 |
|
|
|
536 |
|
|
nodata:
|
537 |
|
|
return retval;
|
538 |
|
|
}
|
539 |
|
|
|
540 |
|
|
/* Make a DATA chunk for the given association. Populate the data
|
541 |
|
|
* payload.
|
542 |
|
|
*/
|
543 |
|
|
struct sctp_chunk *sctp_make_datafrag(struct sctp_association *asoc,
|
544 |
|
|
const struct sctp_sndrcvinfo *sinfo,
|
545 |
|
|
int data_len, const __u8 *data,
|
546 |
|
|
__u8 flags, __u16 ssn)
|
547 |
|
|
{
|
548 |
|
|
struct sctp_chunk *retval;
|
549 |
|
|
|
550 |
|
|
retval = sctp_make_datafrag_empty(asoc, sinfo, data_len, flags, ssn);
|
551 |
|
|
if (retval)
|
552 |
|
|
sctp_addto_chunk(retval, data_len, data);
|
553 |
|
|
|
554 |
|
|
return retval;
|
555 |
|
|
}
|
556 |
|
|
|
557 |
|
|
/* Make a DATA chunk for the given association to ride on stream id
|
558 |
|
|
* 'stream', with a payload id of 'payload', and a body of 'data'.
|
559 |
|
|
*/
|
560 |
|
|
struct sctp_chunk *sctp_make_data(struct sctp_association *asoc,
|
561 |
|
|
const struct sctp_sndrcvinfo *sinfo,
|
562 |
|
|
int data_len, const __u8 *data)
|
563 |
|
|
{
|
564 |
|
|
struct sctp_chunk *retval = NULL;
|
565 |
|
|
|
566 |
|
|
retval = sctp_make_data_empty(asoc, sinfo, data_len);
|
567 |
|
|
if (retval)
|
568 |
|
|
sctp_addto_chunk(retval, data_len, data);
|
569 |
|
|
return retval;
|
570 |
|
|
}
|
571 |
|
|
|
572 |
|
|
/* Make a DATA chunk for the given association to ride on stream id
|
573 |
|
|
* 'stream', with a payload id of 'payload', and a body big enough to
|
574 |
|
|
* hold 'data_len' octets of data. We use this version when we need
|
575 |
|
|
* to build the message AFTER allocating memory.
|
576 |
|
|
*/
|
577 |
|
|
struct sctp_chunk *sctp_make_data_empty(struct sctp_association *asoc,
|
578 |
|
|
const struct sctp_sndrcvinfo *sinfo,
|
579 |
|
|
int data_len)
|
580 |
|
|
{
|
581 |
|
|
__u8 flags = SCTP_DATA_NOT_FRAG;
|
582 |
|
|
|
583 |
|
|
return sctp_make_datafrag_empty(asoc, sinfo, data_len, flags, 0);
|
584 |
|
|
}
|
585 |
|
|
|
586 |
|
|
/* Create a selective ackowledgement (SACK) for the given
|
587 |
|
|
* association. This reports on which TSN's we've seen to date,
|
588 |
|
|
* including duplicates and gaps.
|
589 |
|
|
*/
|
590 |
|
|
struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
|
591 |
|
|
{
|
592 |
|
|
struct sctp_chunk *retval;
|
593 |
|
|
struct sctp_sackhdr sack;
|
594 |
|
|
int len;
|
595 |
|
|
__u32 ctsn;
|
596 |
|
|
__u16 num_gabs, num_dup_tsns;
|
597 |
|
|
struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
|
598 |
|
|
|
599 |
|
|
ctsn = sctp_tsnmap_get_ctsn(map);
|
600 |
|
|
SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
|
601 |
|
|
|
602 |
|
|
/* How much room is needed in the chunk? */
|
603 |
|
|
num_gabs = sctp_tsnmap_num_gabs(map);
|
604 |
|
|
num_dup_tsns = sctp_tsnmap_num_dups(map);
|
605 |
|
|
|
606 |
|
|
/* Initialize the SACK header. */
|
607 |
|
|
sack.cum_tsn_ack = htonl(ctsn);
|
608 |
|
|
sack.a_rwnd = htonl(asoc->a_rwnd);
|
609 |
|
|
sack.num_gap_ack_blocks = htons(num_gabs);
|
610 |
|
|
sack.num_dup_tsns = htons(num_dup_tsns);
|
611 |
|
|
|
612 |
|
|
len = sizeof(sack)
|
613 |
|
|
+ sizeof(struct sctp_gap_ack_block) * num_gabs
|
614 |
|
|
+ sizeof(__u32) * num_dup_tsns;
|
615 |
|
|
|
616 |
|
|
/* Create the chunk. */
|
617 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
|
618 |
|
|
if (!retval)
|
619 |
|
|
goto nodata;
|
620 |
|
|
|
621 |
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
622 |
|
|
*
|
623 |
|
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
624 |
|
|
* HEARTBEAT ACK, etc.) to the same destination transport
|
625 |
|
|
* address from which it received the DATA or control chunk to
|
626 |
|
|
* which it is replying. This rule should also be followed if
|
627 |
|
|
* the endpoint is bundling DATA chunks together with the
|
628 |
|
|
* reply chunk.
|
629 |
|
|
*
|
630 |
|
|
* However, when acknowledging multiple DATA chunks received
|
631 |
|
|
* in packets from different source addresses in a single
|
632 |
|
|
* SACK, the SACK chunk may be transmitted to one of the
|
633 |
|
|
* destination transport addresses from which the DATA or
|
634 |
|
|
* control chunks being acknowledged were received.
|
635 |
|
|
*
|
636 |
|
|
* [BUG: We do not implement the following paragraph.
|
637 |
|
|
* Perhaps we should remember the last transport we used for a
|
638 |
|
|
* SACK and avoid that (if possible) if we have seen any
|
639 |
|
|
* duplicates. --piggy]
|
640 |
|
|
*
|
641 |
|
|
* When a receiver of a duplicate DATA chunk sends a SACK to a
|
642 |
|
|
* multi- homed endpoint it MAY be beneficial to vary the
|
643 |
|
|
* destination address and not use the source address of the
|
644 |
|
|
* DATA chunk. The reason being that receiving a duplicate
|
645 |
|
|
* from a multi-homed endpoint might indicate that the return
|
646 |
|
|
* path (as specified in the source address of the DATA chunk)
|
647 |
|
|
* for the SACK is broken.
|
648 |
|
|
*
|
649 |
|
|
* [Send to the address from which we last received a DATA chunk.]
|
650 |
|
|
*/
|
651 |
|
|
retval->transport = asoc->peer.last_data_from;
|
652 |
|
|
|
653 |
|
|
retval->subh.sack_hdr =
|
654 |
|
|
sctp_addto_chunk(retval, sizeof(sack), &sack);
|
655 |
|
|
|
656 |
|
|
/* Add the gap ack block information. */
|
657 |
|
|
if (num_gabs)
|
658 |
|
|
sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
|
659 |
|
|
sctp_tsnmap_get_gabs(map));
|
660 |
|
|
|
661 |
|
|
/* Add the duplicate TSN information. */
|
662 |
|
|
if (num_dup_tsns)
|
663 |
|
|
sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
|
664 |
|
|
sctp_tsnmap_get_dups(map));
|
665 |
|
|
|
666 |
|
|
nodata:
|
667 |
|
|
return retval;
|
668 |
|
|
}
|
669 |
|
|
|
670 |
|
|
/* Make a SHUTDOWN chunk. */
|
671 |
|
|
struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
|
672 |
|
|
const struct sctp_chunk *chunk)
|
673 |
|
|
{
|
674 |
|
|
struct sctp_chunk *retval;
|
675 |
|
|
sctp_shutdownhdr_t shut;
|
676 |
|
|
__u32 ctsn;
|
677 |
|
|
|
678 |
|
|
ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
|
679 |
|
|
shut.cum_tsn_ack = htonl(ctsn);
|
680 |
|
|
|
681 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
|
682 |
|
|
sizeof(sctp_shutdownhdr_t));
|
683 |
|
|
if (!retval)
|
684 |
|
|
goto nodata;
|
685 |
|
|
|
686 |
|
|
retval->subh.shutdown_hdr =
|
687 |
|
|
sctp_addto_chunk(retval, sizeof(shut), &shut);
|
688 |
|
|
|
689 |
|
|
if (chunk)
|
690 |
|
|
retval->transport = chunk->transport;
|
691 |
|
|
nodata:
|
692 |
|
|
return retval;
|
693 |
|
|
}
|
694 |
|
|
|
695 |
|
|
struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
|
696 |
|
|
const struct sctp_chunk *chunk)
|
697 |
|
|
{
|
698 |
|
|
struct sctp_chunk *retval;
|
699 |
|
|
|
700 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
|
701 |
|
|
|
702 |
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
703 |
|
|
*
|
704 |
|
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
705 |
|
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
706 |
|
|
* address from which it * received the DATA or control chunk
|
707 |
|
|
* to which it is replying.
|
708 |
|
|
*
|
709 |
|
|
* [ACK back to where the SHUTDOWN came from.]
|
710 |
|
|
*/
|
711 |
|
|
if (retval && chunk)
|
712 |
|
|
retval->transport = chunk->transport;
|
713 |
|
|
|
714 |
|
|
return retval;
|
715 |
|
|
}
|
716 |
|
|
|
717 |
|
|
struct sctp_chunk *sctp_make_shutdown_complete(
|
718 |
|
|
const struct sctp_association *asoc,
|
719 |
|
|
const struct sctp_chunk *chunk)
|
720 |
|
|
{
|
721 |
|
|
struct sctp_chunk *retval;
|
722 |
|
|
__u8 flags = 0;
|
723 |
|
|
|
724 |
|
|
/* Maybe set the T-bit if we have no association. */
|
725 |
|
|
flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
|
726 |
|
|
|
727 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
|
728 |
|
|
|
729 |
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
730 |
|
|
*
|
731 |
|
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
732 |
|
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
733 |
|
|
* address from which it * received the DATA or control chunk
|
734 |
|
|
* to which it is replying.
|
735 |
|
|
*
|
736 |
|
|
* [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
|
737 |
|
|
* came from.]
|
738 |
|
|
*/
|
739 |
|
|
if (retval && chunk)
|
740 |
|
|
retval->transport = chunk->transport;
|
741 |
|
|
|
742 |
|
|
return retval;
|
743 |
|
|
}
|
744 |
|
|
|
745 |
|
|
/* Create an ABORT. Note that we set the T bit if we have no
|
746 |
|
|
* association.
|
747 |
|
|
*/
|
748 |
|
|
struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
|
749 |
|
|
const struct sctp_chunk *chunk,
|
750 |
|
|
const size_t hint)
|
751 |
|
|
{
|
752 |
|
|
struct sctp_chunk *retval;
|
753 |
|
|
__u8 flags = 0;
|
754 |
|
|
|
755 |
|
|
/* Maybe set the T-bit if we have no association. */
|
756 |
|
|
flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
|
757 |
|
|
|
758 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
|
759 |
|
|
|
760 |
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
761 |
|
|
*
|
762 |
|
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
763 |
|
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
764 |
|
|
* address from which it * received the DATA or control chunk
|
765 |
|
|
* to which it is replying.
|
766 |
|
|
*
|
767 |
|
|
* [ABORT back to where the offender came from.]
|
768 |
|
|
*/
|
769 |
|
|
if (retval && chunk)
|
770 |
|
|
retval->transport = chunk->transport;
|
771 |
|
|
|
772 |
|
|
return retval;
|
773 |
|
|
}
|
774 |
|
|
|
775 |
|
|
/* Helper to create ABORT with a NO_USER_DATA error. */
|
776 |
|
|
struct sctp_chunk *sctp_make_abort_no_data(
|
777 |
|
|
const struct sctp_association *asoc,
|
778 |
|
|
const struct sctp_chunk *chunk, __u32 tsn)
|
779 |
|
|
{
|
780 |
|
|
struct sctp_chunk *retval;
|
781 |
|
|
__u32 payload;
|
782 |
|
|
|
783 |
|
|
retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
|
784 |
|
|
+ sizeof(tsn));
|
785 |
|
|
|
786 |
|
|
if (!retval)
|
787 |
|
|
goto no_mem;
|
788 |
|
|
|
789 |
|
|
/* Put the tsn back into network byte order. */
|
790 |
|
|
payload = htonl(tsn);
|
791 |
|
|
sctp_init_cause(retval, SCTP_ERROR_NO_DATA, (const void *)&payload,
|
792 |
|
|
sizeof(payload));
|
793 |
|
|
|
794 |
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
795 |
|
|
*
|
796 |
|
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
797 |
|
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
798 |
|
|
* address from which it * received the DATA or control chunk
|
799 |
|
|
* to which it is replying.
|
800 |
|
|
*
|
801 |
|
|
* [ABORT back to where the offender came from.]
|
802 |
|
|
*/
|
803 |
|
|
if (chunk)
|
804 |
|
|
retval->transport = chunk->transport;
|
805 |
|
|
|
806 |
|
|
no_mem:
|
807 |
|
|
return retval;
|
808 |
|
|
}
|
809 |
|
|
|
810 |
|
|
/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
|
811 |
|
|
struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
|
812 |
|
|
const struct sctp_chunk *chunk,
|
813 |
|
|
const struct msghdr *msg)
|
814 |
|
|
{
|
815 |
|
|
struct sctp_chunk *retval;
|
816 |
|
|
void *payload = NULL, *payoff;
|
817 |
|
|
size_t paylen = 0;
|
818 |
|
|
struct iovec *iov = NULL;
|
819 |
|
|
int iovlen = 0;
|
820 |
|
|
|
821 |
|
|
if (msg) {
|
822 |
|
|
iov = msg->msg_iov;
|
823 |
|
|
iovlen = msg->msg_iovlen;
|
824 |
|
|
paylen = get_user_iov_size(iov, iovlen);
|
825 |
|
|
}
|
826 |
|
|
|
827 |
|
|
retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen);
|
828 |
|
|
if (!retval)
|
829 |
|
|
goto err_chunk;
|
830 |
|
|
|
831 |
|
|
if (paylen) {
|
832 |
|
|
/* Put the msg_iov together into payload. */
|
833 |
|
|
payload = kmalloc(paylen, GFP_ATOMIC);
|
834 |
|
|
if (!payload)
|
835 |
|
|
goto err_payload;
|
836 |
|
|
payoff = payload;
|
837 |
|
|
|
838 |
|
|
for (; iovlen > 0; --iovlen) {
|
839 |
|
|
if (copy_from_user(payoff, iov->iov_base,iov->iov_len))
|
840 |
|
|
goto err_copy;
|
841 |
|
|
payoff += iov->iov_len;
|
842 |
|
|
iov++;
|
843 |
|
|
}
|
844 |
|
|
}
|
845 |
|
|
|
846 |
|
|
sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, payload, paylen);
|
847 |
|
|
|
848 |
|
|
if (paylen)
|
849 |
|
|
kfree(payload);
|
850 |
|
|
|
851 |
|
|
return retval;
|
852 |
|
|
|
853 |
|
|
err_copy:
|
854 |
|
|
kfree(payload);
|
855 |
|
|
err_payload:
|
856 |
|
|
sctp_chunk_free(retval);
|
857 |
|
|
retval = NULL;
|
858 |
|
|
err_chunk:
|
859 |
|
|
return retval;
|
860 |
|
|
}
|
861 |
|
|
|
862 |
|
|
/* Make a HEARTBEAT chunk. */
|
863 |
|
|
struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
|
864 |
|
|
const struct sctp_transport *transport,
|
865 |
|
|
const void *payload, const size_t paylen)
|
866 |
|
|
{
|
867 |
|
|
struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT,
|
868 |
|
|
0, paylen);
|
869 |
|
|
|
870 |
|
|
if (!retval)
|
871 |
|
|
goto nodata;
|
872 |
|
|
|
873 |
|
|
/* Cast away the 'const', as this is just telling the chunk
|
874 |
|
|
* what transport it belongs to.
|
875 |
|
|
*/
|
876 |
|
|
retval->transport = (struct sctp_transport *) transport;
|
877 |
|
|
retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
|
878 |
|
|
|
879 |
|
|
nodata:
|
880 |
|
|
return retval;
|
881 |
|
|
}
|
882 |
|
|
|
883 |
|
|
struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
|
884 |
|
|
const struct sctp_chunk *chunk,
|
885 |
|
|
const void *payload, const size_t paylen)
|
886 |
|
|
{
|
887 |
|
|
struct sctp_chunk *retval;
|
888 |
|
|
|
889 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
|
890 |
|
|
if (!retval)
|
891 |
|
|
goto nodata;
|
892 |
|
|
|
893 |
|
|
retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
|
894 |
|
|
|
895 |
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
896 |
|
|
*
|
897 |
|
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
898 |
|
|
* HEARTBEAT ACK, * etc.) to the same destination transport
|
899 |
|
|
* address from which it * received the DATA or control chunk
|
900 |
|
|
* to which it is replying.
|
901 |
|
|
*
|
902 |
|
|
* [HBACK back to where the HEARTBEAT came from.]
|
903 |
|
|
*/
|
904 |
|
|
if (chunk)
|
905 |
|
|
retval->transport = chunk->transport;
|
906 |
|
|
|
907 |
|
|
nodata:
|
908 |
|
|
return retval;
|
909 |
|
|
}
|
910 |
|
|
|
911 |
|
|
/* Create an Operation Error chunk with the specified space reserved.
|
912 |
|
|
* This routine can be used for containing multiple causes in the chunk.
|
913 |
|
|
*/
|
914 |
|
|
struct sctp_chunk *sctp_make_op_error_space(
|
915 |
|
|
const struct sctp_association *asoc,
|
916 |
|
|
const struct sctp_chunk *chunk,
|
917 |
|
|
size_t size)
|
918 |
|
|
{
|
919 |
|
|
struct sctp_chunk *retval;
|
920 |
|
|
|
921 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
|
922 |
|
|
sizeof(sctp_errhdr_t) + size);
|
923 |
|
|
if (!retval)
|
924 |
|
|
goto nodata;
|
925 |
|
|
|
926 |
|
|
/* RFC 2960 6.4 Multi-homed SCTP Endpoints
|
927 |
|
|
*
|
928 |
|
|
* An endpoint SHOULD transmit reply chunks (e.g., SACK,
|
929 |
|
|
* HEARTBEAT ACK, etc.) to the same destination transport
|
930 |
|
|
* address from which it received the DATA or control chunk
|
931 |
|
|
* to which it is replying.
|
932 |
|
|
*
|
933 |
|
|
*/
|
934 |
|
|
if (chunk)
|
935 |
|
|
retval->transport = chunk->transport;
|
936 |
|
|
|
937 |
|
|
nodata:
|
938 |
|
|
return retval;
|
939 |
|
|
}
|
940 |
|
|
|
941 |
|
|
/* Create an Operation Error chunk. */
|
942 |
|
|
struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
|
943 |
|
|
const struct sctp_chunk *chunk,
|
944 |
|
|
__u16 cause_code, const void *payload,
|
945 |
|
|
size_t paylen)
|
946 |
|
|
{
|
947 |
|
|
struct sctp_chunk *retval;
|
948 |
|
|
|
949 |
|
|
retval = sctp_make_op_error_space(asoc, chunk, paylen);
|
950 |
|
|
if (!retval)
|
951 |
|
|
goto nodata;
|
952 |
|
|
|
953 |
|
|
sctp_init_cause(retval, cause_code, payload, paylen);
|
954 |
|
|
|
955 |
|
|
nodata:
|
956 |
|
|
return retval;
|
957 |
|
|
}
|
958 |
|
|
|
959 |
|
|
/********************************************************************
|
960 |
|
|
* 2nd Level Abstractions
|
961 |
|
|
********************************************************************/
|
962 |
|
|
|
963 |
|
|
/* Turn an skb into a chunk.
|
964 |
|
|
* FIXME: Eventually move the structure directly inside the skb->cb[].
|
965 |
|
|
*/
|
966 |
|
|
struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
|
967 |
|
|
const struct sctp_association *asoc,
|
968 |
|
|
struct sock *sk)
|
969 |
|
|
{
|
970 |
|
|
struct sctp_chunk *retval;
|
971 |
|
|
|
972 |
|
|
retval = kmem_cache_alloc(sctp_chunk_cachep, SLAB_ATOMIC);
|
973 |
|
|
|
974 |
|
|
if (!retval)
|
975 |
|
|
goto nodata;
|
976 |
|
|
memset(retval, 0, sizeof(struct sctp_chunk));
|
977 |
|
|
|
978 |
|
|
if (!sk) {
|
979 |
|
|
SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
|
980 |
|
|
}
|
981 |
|
|
|
982 |
|
|
retval->skb = skb;
|
983 |
|
|
retval->asoc = (struct sctp_association *)asoc;
|
984 |
|
|
retval->resent = 0;
|
985 |
|
|
retval->has_tsn = 0;
|
986 |
|
|
retval->has_ssn = 0;
|
987 |
|
|
retval->rtt_in_progress = 0;
|
988 |
|
|
retval->sent_at = 0;
|
989 |
|
|
retval->singleton = 1;
|
990 |
|
|
retval->end_of_packet = 0;
|
991 |
|
|
retval->ecn_ce_done = 0;
|
992 |
|
|
retval->pdiscard = 0;
|
993 |
|
|
|
994 |
|
|
/* sctpimpguide-05.txt Section 2.8.2
|
995 |
|
|
* M1) Each time a new DATA chunk is transmitted
|
996 |
|
|
* set the 'TSN.Missing.Report' count for that TSN to 0. The
|
997 |
|
|
* 'TSN.Missing.Report' count will be used to determine missing chunks
|
998 |
|
|
* and when to fast retransmit.
|
999 |
|
|
*/
|
1000 |
|
|
retval->tsn_missing_report = 0;
|
1001 |
|
|
retval->tsn_gap_acked = 0;
|
1002 |
|
|
retval->fast_retransmit = 0;
|
1003 |
|
|
|
1004 |
|
|
/* If this is a fragmented message, track all fragments
|
1005 |
|
|
* of the message (for SEND_FAILED).
|
1006 |
|
|
*/
|
1007 |
|
|
retval->msg = NULL;
|
1008 |
|
|
|
1009 |
|
|
/* Polish the bead hole. */
|
1010 |
|
|
INIT_LIST_HEAD(&retval->transmitted_list);
|
1011 |
|
|
INIT_LIST_HEAD(&retval->frag_list);
|
1012 |
|
|
SCTP_DBG_OBJCNT_INC(chunk);
|
1013 |
|
|
atomic_set(&retval->refcnt, 1);
|
1014 |
|
|
|
1015 |
|
|
|
1016 |
|
|
nodata:
|
1017 |
|
|
return retval;
|
1018 |
|
|
}
|
1019 |
|
|
|
1020 |
|
|
/* Set chunk->source and dest based on the IP header in chunk->skb. */
|
1021 |
|
|
void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
|
1022 |
|
|
union sctp_addr *dest)
|
1023 |
|
|
{
|
1024 |
|
|
memcpy(&chunk->source, src, sizeof(union sctp_addr));
|
1025 |
|
|
memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
|
1026 |
|
|
}
|
1027 |
|
|
|
1028 |
|
|
/* Extract the source address from a chunk. */
|
1029 |
|
|
const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
|
1030 |
|
|
{
|
1031 |
|
|
/* If we have a known transport, use that. */
|
1032 |
|
|
if (chunk->transport) {
|
1033 |
|
|
return &chunk->transport->ipaddr;
|
1034 |
|
|
} else {
|
1035 |
|
|
/* Otherwise, extract it from the IP header. */
|
1036 |
|
|
return &chunk->source;
|
1037 |
|
|
}
|
1038 |
|
|
}
|
1039 |
|
|
|
1040 |
|
|
/* Create a new chunk, setting the type and flags headers from the
|
1041 |
|
|
* arguments, reserving enough space for a 'paylen' byte payload.
|
1042 |
|
|
*/
|
1043 |
|
|
struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
|
1044 |
|
|
__u8 type, __u8 flags, int paylen)
|
1045 |
|
|
{
|
1046 |
|
|
struct sctp_chunk *retval;
|
1047 |
|
|
sctp_chunkhdr_t *chunk_hdr;
|
1048 |
|
|
struct sk_buff *skb;
|
1049 |
|
|
struct sock *sk;
|
1050 |
|
|
|
1051 |
|
|
/* No need to allocate LL here, as this is only a chunk. */
|
1052 |
|
|
skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
|
1053 |
|
|
GFP_ATOMIC);
|
1054 |
|
|
if (!skb)
|
1055 |
|
|
goto nodata;
|
1056 |
|
|
|
1057 |
|
|
/* Make room for the chunk header. */
|
1058 |
|
|
chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
|
1059 |
|
|
chunk_hdr->type = type;
|
1060 |
|
|
chunk_hdr->flags = flags;
|
1061 |
|
|
chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
|
1062 |
|
|
|
1063 |
|
|
sk = asoc ? asoc->base.sk : NULL;
|
1064 |
|
|
retval = sctp_chunkify(skb, asoc, sk);
|
1065 |
|
|
if (!retval) {
|
1066 |
|
|
kfree_skb(skb);
|
1067 |
|
|
goto nodata;
|
1068 |
|
|
}
|
1069 |
|
|
|
1070 |
|
|
retval->chunk_hdr = chunk_hdr;
|
1071 |
|
|
retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
|
1072 |
|
|
|
1073 |
|
|
/* Set the skb to the belonging sock for accounting. */
|
1074 |
|
|
skb->sk = sk;
|
1075 |
|
|
|
1076 |
|
|
return retval;
|
1077 |
|
|
nodata:
|
1078 |
|
|
return NULL;
|
1079 |
|
|
}
|
1080 |
|
|
|
1081 |
|
|
|
1082 |
|
|
/* Release the memory occupied by a chunk. */
|
1083 |
|
|
static void sctp_chunk_destroy(struct sctp_chunk *chunk)
|
1084 |
|
|
{
|
1085 |
|
|
/* Free the chunk skb data and the SCTP_chunk stub itself. */
|
1086 |
|
|
dev_kfree_skb(chunk->skb);
|
1087 |
|
|
|
1088 |
|
|
SCTP_DBG_OBJCNT_DEC(chunk);
|
1089 |
|
|
kmem_cache_free(sctp_chunk_cachep, chunk);
|
1090 |
|
|
}
|
1091 |
|
|
|
1092 |
|
|
/* Possibly, free the chunk. */
|
1093 |
|
|
void sctp_chunk_free(struct sctp_chunk *chunk)
|
1094 |
|
|
{
|
1095 |
|
|
/* Make sure that we are not on any list. */
|
1096 |
|
|
skb_unlink((struct sk_buff *) chunk);
|
1097 |
|
|
list_del_init(&chunk->transmitted_list);
|
1098 |
|
|
|
1099 |
|
|
/* Release our reference on the message tracker. */
|
1100 |
|
|
if (chunk->msg)
|
1101 |
|
|
sctp_datamsg_put(chunk->msg);
|
1102 |
|
|
|
1103 |
|
|
sctp_chunk_put(chunk);
|
1104 |
|
|
}
|
1105 |
|
|
|
1106 |
|
|
/* Grab a reference to the chunk. */
|
1107 |
|
|
void sctp_chunk_hold(struct sctp_chunk *ch)
|
1108 |
|
|
{
|
1109 |
|
|
atomic_inc(&ch->refcnt);
|
1110 |
|
|
}
|
1111 |
|
|
|
1112 |
|
|
/* Release a reference to the chunk. */
|
1113 |
|
|
void sctp_chunk_put(struct sctp_chunk *ch)
|
1114 |
|
|
{
|
1115 |
|
|
if (atomic_dec_and_test(&ch->refcnt))
|
1116 |
|
|
sctp_chunk_destroy(ch);
|
1117 |
|
|
}
|
1118 |
|
|
|
1119 |
|
|
/* Append bytes to the end of a chunk. Will panic if chunk is not big
|
1120 |
|
|
* enough.
|
1121 |
|
|
*/
|
1122 |
|
|
void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
|
1123 |
|
|
{
|
1124 |
|
|
void *target;
|
1125 |
|
|
void *padding;
|
1126 |
|
|
int chunklen = ntohs(chunk->chunk_hdr->length);
|
1127 |
|
|
int padlen = chunklen % 4;
|
1128 |
|
|
|
1129 |
|
|
padding = skb_put(chunk->skb, padlen);
|
1130 |
|
|
target = skb_put(chunk->skb, len);
|
1131 |
|
|
|
1132 |
|
|
memset(padding, 0, padlen);
|
1133 |
|
|
memcpy(target, data, len);
|
1134 |
|
|
|
1135 |
|
|
/* Adjust the chunk length field. */
|
1136 |
|
|
chunk->chunk_hdr->length = htons(chunklen + padlen + len);
|
1137 |
|
|
chunk->chunk_end = chunk->skb->tail;
|
1138 |
|
|
|
1139 |
|
|
return target;
|
1140 |
|
|
}
|
1141 |
|
|
|
1142 |
|
|
/* Append bytes from user space to the end of a chunk. Will panic if
|
1143 |
|
|
* chunk is not big enough.
|
1144 |
|
|
* Returns a kernel err value.
|
1145 |
|
|
*/
|
1146 |
|
|
int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
|
1147 |
|
|
struct iovec *data)
|
1148 |
|
|
{
|
1149 |
|
|
__u8 *target;
|
1150 |
|
|
int err = 0;
|
1151 |
|
|
|
1152 |
|
|
/* Make room in chunk for data. */
|
1153 |
|
|
target = skb_put(chunk->skb, len);
|
1154 |
|
|
|
1155 |
|
|
/* Copy data (whole iovec) into chunk */
|
1156 |
|
|
if ((err = memcpy_fromiovecend(target, data, off, len)))
|
1157 |
|
|
goto out;
|
1158 |
|
|
|
1159 |
|
|
/* Adjust the chunk length field. */
|
1160 |
|
|
chunk->chunk_hdr->length =
|
1161 |
|
|
htons(ntohs(chunk->chunk_hdr->length) + len);
|
1162 |
|
|
chunk->chunk_end = chunk->skb->tail;
|
1163 |
|
|
|
1164 |
|
|
out:
|
1165 |
|
|
return err;
|
1166 |
|
|
}
|
1167 |
|
|
|
1168 |
|
|
/* Helper function to assign a TSN if needed. This assumes that both
|
1169 |
|
|
* the data_hdr and association have already been assigned.
|
1170 |
|
|
*/
|
1171 |
|
|
void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
|
1172 |
|
|
{
|
1173 |
|
|
__u16 ssn;
|
1174 |
|
|
__u16 sid;
|
1175 |
|
|
|
1176 |
|
|
if (chunk->has_ssn)
|
1177 |
|
|
return;
|
1178 |
|
|
|
1179 |
|
|
/* This is the last possible instant to assign a SSN. */
|
1180 |
|
|
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
|
1181 |
|
|
ssn = 0;
|
1182 |
|
|
} else {
|
1183 |
|
|
sid = htons(chunk->subh.data_hdr->stream);
|
1184 |
|
|
if (chunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
|
1185 |
|
|
ssn = sctp_ssn_next(&chunk->asoc->ssnmap->out, sid);
|
1186 |
|
|
else
|
1187 |
|
|
ssn = sctp_ssn_peek(&chunk->asoc->ssnmap->out, sid);
|
1188 |
|
|
ssn = htons(ssn);
|
1189 |
|
|
}
|
1190 |
|
|
|
1191 |
|
|
chunk->subh.data_hdr->ssn = ssn;
|
1192 |
|
|
chunk->has_ssn = 1;
|
1193 |
|
|
}
|
1194 |
|
|
|
1195 |
|
|
/* Helper function to assign a TSN if needed. This assumes that both
|
1196 |
|
|
* the data_hdr and association have already been assigned.
|
1197 |
|
|
*/
|
1198 |
|
|
void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
|
1199 |
|
|
{
|
1200 |
|
|
if (!chunk->has_tsn) {
|
1201 |
|
|
/* This is the last possible instant to
|
1202 |
|
|
* assign a TSN.
|
1203 |
|
|
*/
|
1204 |
|
|
chunk->subh.data_hdr->tsn =
|
1205 |
|
|
htonl(sctp_association_get_next_tsn(chunk->asoc));
|
1206 |
|
|
chunk->has_tsn = 1;
|
1207 |
|
|
}
|
1208 |
|
|
}
|
1209 |
|
|
|
1210 |
|
|
/* Create a CLOSED association to use with an incoming packet. */
|
1211 |
|
|
struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
|
1212 |
|
|
struct sctp_chunk *chunk, int gfp)
|
1213 |
|
|
{
|
1214 |
|
|
struct sctp_association *asoc;
|
1215 |
|
|
struct sk_buff *skb;
|
1216 |
|
|
sctp_scope_t scope;
|
1217 |
|
|
struct sctp_af *af;
|
1218 |
|
|
|
1219 |
|
|
/* Create the bare association. */
|
1220 |
|
|
scope = sctp_scope(sctp_source(chunk));
|
1221 |
|
|
asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
|
1222 |
|
|
if (!asoc)
|
1223 |
|
|
goto nodata;
|
1224 |
|
|
asoc->temp = 1;
|
1225 |
|
|
skb = chunk->skb;
|
1226 |
|
|
/* Create an entry for the source address of the packet. */
|
1227 |
|
|
af = sctp_get_af_specific(ipver2af(skb->nh.iph->version));
|
1228 |
|
|
if (unlikely(!af))
|
1229 |
|
|
goto fail;
|
1230 |
|
|
af->from_skb(&asoc->c.peer_addr, skb, 1);
|
1231 |
|
|
nodata:
|
1232 |
|
|
return asoc;
|
1233 |
|
|
|
1234 |
|
|
fail:
|
1235 |
|
|
sctp_association_free(asoc);
|
1236 |
|
|
return NULL;
|
1237 |
|
|
}
|
1238 |
|
|
|
1239 |
|
|
/* Build a cookie representing asoc.
|
1240 |
|
|
* This INCLUDES the param header needed to put the cookie in the INIT ACK.
|
1241 |
|
|
*/
|
1242 |
|
|
sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
|
1243 |
|
|
const struct sctp_association *asoc,
|
1244 |
|
|
const struct sctp_chunk *init_chunk,
|
1245 |
|
|
int *cookie_len,
|
1246 |
|
|
const __u8 *raw_addrs, int addrs_len)
|
1247 |
|
|
{
|
1248 |
|
|
sctp_cookie_param_t *retval;
|
1249 |
|
|
struct sctp_signed_cookie *cookie;
|
1250 |
|
|
struct scatterlist sg;
|
1251 |
|
|
int headersize, bodysize;
|
1252 |
|
|
unsigned int keylen;
|
1253 |
|
|
char *key;
|
1254 |
|
|
|
1255 |
|
|
headersize = sizeof(sctp_paramhdr_t) + SCTP_SECRET_SIZE;
|
1256 |
|
|
bodysize = sizeof(struct sctp_cookie)
|
1257 |
|
|
+ ntohs(init_chunk->chunk_hdr->length) + addrs_len;
|
1258 |
|
|
|
1259 |
|
|
/* Pad out the cookie to a multiple to make the signature
|
1260 |
|
|
* functions simpler to write.
|
1261 |
|
|
*/
|
1262 |
|
|
if (bodysize % SCTP_COOKIE_MULTIPLE)
|
1263 |
|
|
bodysize += SCTP_COOKIE_MULTIPLE
|
1264 |
|
|
- (bodysize % SCTP_COOKIE_MULTIPLE);
|
1265 |
|
|
*cookie_len = headersize + bodysize;
|
1266 |
|
|
|
1267 |
|
|
retval = (sctp_cookie_param_t *)kmalloc(*cookie_len, GFP_ATOMIC);
|
1268 |
|
|
|
1269 |
|
|
if (!retval) {
|
1270 |
|
|
*cookie_len = 0;
|
1271 |
|
|
goto nodata;
|
1272 |
|
|
}
|
1273 |
|
|
|
1274 |
|
|
/* Clear this memory since we are sending this data structure
|
1275 |
|
|
* out on the network.
|
1276 |
|
|
*/
|
1277 |
|
|
memset(retval, 0x00, *cookie_len);
|
1278 |
|
|
cookie = (struct sctp_signed_cookie *) retval->body;
|
1279 |
|
|
|
1280 |
|
|
/* Set up the parameter header. */
|
1281 |
|
|
retval->p.type = SCTP_PARAM_STATE_COOKIE;
|
1282 |
|
|
retval->p.length = htons(*cookie_len);
|
1283 |
|
|
|
1284 |
|
|
/* Copy the cookie part of the association itself. */
|
1285 |
|
|
cookie->c = asoc->c;
|
1286 |
|
|
/* Save the raw address list length in the cookie. */
|
1287 |
|
|
cookie->c.raw_addr_list_len = addrs_len;
|
1288 |
|
|
|
1289 |
|
|
/* Set an expiration time for the cookie. */
|
1290 |
|
|
do_gettimeofday(&cookie->c.expiration);
|
1291 |
|
|
TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
|
1292 |
|
|
|
1293 |
|
|
/* Copy the peer's init packet. */
|
1294 |
|
|
memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
|
1295 |
|
|
ntohs(init_chunk->chunk_hdr->length));
|
1296 |
|
|
|
1297 |
|
|
/* Copy the raw local address list of the association. */
|
1298 |
|
|
memcpy((__u8 *)&cookie->c.peer_init[0] +
|
1299 |
|
|
ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
|
1300 |
|
|
|
1301 |
|
|
if (sctp_sk(ep->base.sk)->hmac) {
|
1302 |
|
|
/* Sign the message. */
|
1303 |
|
|
sg.page = virt_to_page(&cookie->c);
|
1304 |
|
|
sg.offset = (unsigned long)(&cookie->c) % PAGE_SIZE;
|
1305 |
|
|
sg.length = bodysize;
|
1306 |
|
|
keylen = SCTP_SECRET_SIZE;
|
1307 |
|
|
key = (char *)ep->secret_key[ep->current_key];
|
1308 |
|
|
|
1309 |
|
|
sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen,
|
1310 |
|
|
&sg, 1, cookie->signature);
|
1311 |
|
|
}
|
1312 |
|
|
|
1313 |
|
|
nodata:
|
1314 |
|
|
return retval;
|
1315 |
|
|
}
|
1316 |
|
|
|
1317 |
|
|
/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
|
1318 |
|
|
struct sctp_association *sctp_unpack_cookie(
|
1319 |
|
|
const struct sctp_endpoint *ep,
|
1320 |
|
|
const struct sctp_association *asoc,
|
1321 |
|
|
struct sctp_chunk *chunk, int gfp,
|
1322 |
|
|
int *error, struct sctp_chunk **errp)
|
1323 |
|
|
{
|
1324 |
|
|
struct sctp_association *retval = NULL;
|
1325 |
|
|
struct sctp_signed_cookie *cookie;
|
1326 |
|
|
struct sctp_cookie *bear_cookie;
|
1327 |
|
|
int headersize, bodysize, fixed_size;
|
1328 |
|
|
__u8 digest[SCTP_SIGNATURE_SIZE];
|
1329 |
|
|
struct scatterlist sg;
|
1330 |
|
|
unsigned int keylen, len;
|
1331 |
|
|
char *key;
|
1332 |
|
|
sctp_scope_t scope;
|
1333 |
|
|
struct sk_buff *skb = chunk->skb;
|
1334 |
|
|
|
1335 |
|
|
headersize = sizeof(sctp_chunkhdr_t) + SCTP_SECRET_SIZE;
|
1336 |
|
|
bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
|
1337 |
|
|
fixed_size = headersize + sizeof(struct sctp_cookie);
|
1338 |
|
|
|
1339 |
|
|
/* Verify that the chunk looks like it even has a cookie.
|
1340 |
|
|
* There must be enough room for our cookie and our peer's
|
1341 |
|
|
* INIT chunk.
|
1342 |
|
|
*/
|
1343 |
|
|
len = ntohs(chunk->chunk_hdr->length);
|
1344 |
|
|
if (len < fixed_size + sizeof(struct sctp_chunkhdr))
|
1345 |
|
|
goto malformed;
|
1346 |
|
|
|
1347 |
|
|
/* Verify that the cookie has been padded out. */
|
1348 |
|
|
if (bodysize % SCTP_COOKIE_MULTIPLE)
|
1349 |
|
|
goto malformed;
|
1350 |
|
|
|
1351 |
|
|
/* Process the cookie. */
|
1352 |
|
|
cookie = chunk->subh.cookie_hdr;
|
1353 |
|
|
bear_cookie = &cookie->c;
|
1354 |
|
|
|
1355 |
|
|
if (!sctp_sk(ep->base.sk)->hmac)
|
1356 |
|
|
goto no_hmac;
|
1357 |
|
|
|
1358 |
|
|
/* Check the signature. */
|
1359 |
|
|
keylen = SCTP_SECRET_SIZE;
|
1360 |
|
|
sg.page = virt_to_page(bear_cookie);
|
1361 |
|
|
sg.offset = (unsigned long)(bear_cookie) % PAGE_SIZE;
|
1362 |
|
|
sg.length = bodysize;
|
1363 |
|
|
key = (char *)ep->secret_key[ep->current_key];
|
1364 |
|
|
|
1365 |
|
|
memset(digest, 0x00, sizeof(digest));
|
1366 |
|
|
sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen, &sg,
|
1367 |
|
|
1, digest);
|
1368 |
|
|
|
1369 |
|
|
if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
|
1370 |
|
|
/* Try the previous key. */
|
1371 |
|
|
key = (char *)ep->secret_key[ep->last_key];
|
1372 |
|
|
memset(digest, 0x00, sizeof(digest));
|
1373 |
|
|
sctp_crypto_hmac(sctp_sk(ep->base.sk)->hmac, key, &keylen,
|
1374 |
|
|
&sg, 1, digest);
|
1375 |
|
|
|
1376 |
|
|
if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
|
1377 |
|
|
/* Yikes! Still bad signature! */
|
1378 |
|
|
*error = -SCTP_IERROR_BAD_SIG;
|
1379 |
|
|
goto fail;
|
1380 |
|
|
}
|
1381 |
|
|
}
|
1382 |
|
|
|
1383 |
|
|
no_hmac:
|
1384 |
|
|
/* Check to see if the cookie is stale. If there is already
|
1385 |
|
|
* an association, there is no need to check cookie's expiration
|
1386 |
|
|
* for init collision case of lost COOKIE ACK.
|
1387 |
|
|
*/
|
1388 |
|
|
if (!asoc && tv_lt(bear_cookie->expiration, skb->stamp)) {
|
1389 |
|
|
__u16 len;
|
1390 |
|
|
/*
|
1391 |
|
|
* Section 3.3.10.3 Stale Cookie Error (3)
|
1392 |
|
|
*
|
1393 |
|
|
* Cause of error
|
1394 |
|
|
* ---------------
|
1395 |
|
|
* Stale Cookie Error: Indicates the receipt of a valid State
|
1396 |
|
|
* Cookie that has expired.
|
1397 |
|
|
*/
|
1398 |
|
|
len = ntohs(chunk->chunk_hdr->length);
|
1399 |
|
|
*errp = sctp_make_op_error_space(asoc, chunk, len);
|
1400 |
|
|
if (*errp) {
|
1401 |
|
|
suseconds_t usecs = (skb->stamp.tv_sec -
|
1402 |
|
|
bear_cookie->expiration.tv_sec) * 1000000L +
|
1403 |
|
|
skb->stamp.tv_usec -
|
1404 |
|
|
bear_cookie->expiration.tv_usec;
|
1405 |
|
|
|
1406 |
|
|
usecs = htonl(usecs);
|
1407 |
|
|
sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
|
1408 |
|
|
&usecs, sizeof(usecs));
|
1409 |
|
|
*error = -SCTP_IERROR_STALE_COOKIE;
|
1410 |
|
|
} else
|
1411 |
|
|
*error = -SCTP_IERROR_NOMEM;
|
1412 |
|
|
|
1413 |
|
|
goto fail;
|
1414 |
|
|
}
|
1415 |
|
|
|
1416 |
|
|
/* Make a new base association. */
|
1417 |
|
|
scope = sctp_scope(sctp_source(chunk));
|
1418 |
|
|
retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
|
1419 |
|
|
if (!retval) {
|
1420 |
|
|
*error = -SCTP_IERROR_NOMEM;
|
1421 |
|
|
goto fail;
|
1422 |
|
|
}
|
1423 |
|
|
|
1424 |
|
|
/* Set up our peer's port number. */
|
1425 |
|
|
retval->peer.port = ntohs(chunk->sctp_hdr->source);
|
1426 |
|
|
|
1427 |
|
|
/* Populate the association from the cookie. */
|
1428 |
|
|
memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
|
1429 |
|
|
|
1430 |
|
|
if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
|
1431 |
|
|
GFP_ATOMIC) < 0) {
|
1432 |
|
|
*error = -SCTP_IERROR_NOMEM;
|
1433 |
|
|
goto fail;
|
1434 |
|
|
}
|
1435 |
|
|
|
1436 |
|
|
/* Also, add the destination address. */
|
1437 |
|
|
if (list_empty(&retval->base.bind_addr.address_list)) {
|
1438 |
|
|
sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
|
1439 |
|
|
GFP_ATOMIC);
|
1440 |
|
|
}
|
1441 |
|
|
|
1442 |
|
|
retval->next_tsn = retval->c.initial_tsn;
|
1443 |
|
|
retval->ctsn_ack_point = retval->next_tsn - 1;
|
1444 |
|
|
retval->addip_serial = retval->c.initial_tsn;
|
1445 |
|
|
|
1446 |
|
|
/* The INIT stuff will be done by the side effects. */
|
1447 |
|
|
return retval;
|
1448 |
|
|
|
1449 |
|
|
fail:
|
1450 |
|
|
if (retval)
|
1451 |
|
|
sctp_association_free(retval);
|
1452 |
|
|
|
1453 |
|
|
return NULL;
|
1454 |
|
|
|
1455 |
|
|
malformed:
|
1456 |
|
|
/* Yikes! The packet is either corrupt or deliberately
|
1457 |
|
|
* malformed.
|
1458 |
|
|
*/
|
1459 |
|
|
*error = -SCTP_IERROR_MALFORMED;
|
1460 |
|
|
goto fail;
|
1461 |
|
|
}
|
1462 |
|
|
|
1463 |
|
|
/********************************************************************
|
1464 |
|
|
* 3rd Level Abstractions
|
1465 |
|
|
********************************************************************/
|
1466 |
|
|
|
1467 |
|
|
struct __sctp_missing {
|
1468 |
|
|
__u32 num_missing;
|
1469 |
|
|
__u16 type;
|
1470 |
|
|
} __attribute__((packed));;
|
1471 |
|
|
|
1472 |
|
|
/*
|
1473 |
|
|
* Report a missing mandatory parameter.
|
1474 |
|
|
*/
|
1475 |
|
|
static int sctp_process_missing_param(const struct sctp_association *asoc,
|
1476 |
|
|
sctp_param_t paramtype,
|
1477 |
|
|
struct sctp_chunk *chunk,
|
1478 |
|
|
struct sctp_chunk **errp)
|
1479 |
|
|
{
|
1480 |
|
|
struct __sctp_missing report;
|
1481 |
|
|
__u16 len;
|
1482 |
|
|
|
1483 |
|
|
len = WORD_ROUND(sizeof(report));
|
1484 |
|
|
|
1485 |
|
|
/* Make an ERROR chunk, preparing enough room for
|
1486 |
|
|
* returning multiple unknown parameters.
|
1487 |
|
|
*/
|
1488 |
|
|
if (!*errp)
|
1489 |
|
|
*errp = sctp_make_op_error_space(asoc, chunk, len);
|
1490 |
|
|
|
1491 |
|
|
if (*errp) {
|
1492 |
|
|
report.num_missing = htonl(1);
|
1493 |
|
|
report.type = paramtype;
|
1494 |
|
|
sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM,
|
1495 |
|
|
&report, sizeof(report));
|
1496 |
|
|
}
|
1497 |
|
|
|
1498 |
|
|
/* Stop processing this chunk. */
|
1499 |
|
|
return 0;
|
1500 |
|
|
}
|
1501 |
|
|
|
1502 |
|
|
/* Report an Invalid Mandatory Parameter. */
|
1503 |
|
|
static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
|
1504 |
|
|
struct sctp_chunk *chunk,
|
1505 |
|
|
struct sctp_chunk **errp)
|
1506 |
|
|
{
|
1507 |
|
|
/* Invalid Mandatory Parameter Error has no payload. */
|
1508 |
|
|
|
1509 |
|
|
if (!*errp)
|
1510 |
|
|
*errp = sctp_make_op_error_space(asoc, chunk, 0);
|
1511 |
|
|
|
1512 |
|
|
if (*errp)
|
1513 |
|
|
sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, NULL, 0);
|
1514 |
|
|
|
1515 |
|
|
/* Stop processing this chunk. */
|
1516 |
|
|
return 0;
|
1517 |
|
|
}
|
1518 |
|
|
|
1519 |
|
|
/* Do not attempt to handle the HOST_NAME parm. However, do
|
1520 |
|
|
* send back an indicator to the peer.
|
1521 |
|
|
*/
|
1522 |
|
|
static int sctp_process_hn_param(const struct sctp_association *asoc,
|
1523 |
|
|
union sctp_params param,
|
1524 |
|
|
struct sctp_chunk *chunk,
|
1525 |
|
|
struct sctp_chunk **errp)
|
1526 |
|
|
{
|
1527 |
|
|
__u16 len = ntohs(param.p->length);
|
1528 |
|
|
|
1529 |
|
|
/* Make an ERROR chunk. */
|
1530 |
|
|
if (!*errp)
|
1531 |
|
|
*errp = sctp_make_op_error_space(asoc, chunk, len);
|
1532 |
|
|
|
1533 |
|
|
if (*errp)
|
1534 |
|
|
sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED,
|
1535 |
|
|
param.v, len);
|
1536 |
|
|
|
1537 |
|
|
/* Stop processing this chunk. */
|
1538 |
|
|
return 0;
|
1539 |
|
|
}
|
1540 |
|
|
|
1541 |
|
|
/* RFC 3.2.1 & the Implementers Guide 2.2.
|
1542 |
|
|
*
|
1543 |
|
|
* The Parameter Types are encoded such that the
|
1544 |
|
|
* highest-order two bits specify the action that must be
|
1545 |
|
|
* taken if the processing endpoint does not recognize the
|
1546 |
|
|
* Parameter Type.
|
1547 |
|
|
*
|
1548 |
|
|
* 00 - Stop processing this SCTP chunk and discard it,
|
1549 |
|
|
* do not process any further chunks within it.
|
1550 |
|
|
*
|
1551 |
|
|
* 01 - Stop processing this SCTP chunk and discard it,
|
1552 |
|
|
* do not process any further chunks within it, and report
|
1553 |
|
|
* the unrecognized parameter in an 'Unrecognized
|
1554 |
|
|
* Parameter Type' (in either an ERROR or in the INIT ACK).
|
1555 |
|
|
*
|
1556 |
|
|
* 10 - Skip this parameter and continue processing.
|
1557 |
|
|
*
|
1558 |
|
|
* 11 - Skip this parameter and continue processing but
|
1559 |
|
|
* report the unrecognized parameter in an
|
1560 |
|
|
* 'Unrecognized Parameter Type' (in either an ERROR or in
|
1561 |
|
|
* the INIT ACK).
|
1562 |
|
|
*
|
1563 |
|
|
* Return value:
|
1564 |
|
|
* 0 - discard the chunk
|
1565 |
|
|
* 1 - continue with the chunk
|
1566 |
|
|
*/
|
1567 |
|
|
static int sctp_process_unk_param(const struct sctp_association *asoc,
|
1568 |
|
|
union sctp_params param,
|
1569 |
|
|
struct sctp_chunk *chunk,
|
1570 |
|
|
struct sctp_chunk **errp)
|
1571 |
|
|
{
|
1572 |
|
|
int retval = 1;
|
1573 |
|
|
|
1574 |
|
|
switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
|
1575 |
|
|
case SCTP_PARAM_ACTION_DISCARD:
|
1576 |
|
|
retval = 0;
|
1577 |
|
|
break;
|
1578 |
|
|
case SCTP_PARAM_ACTION_DISCARD_ERR:
|
1579 |
|
|
retval = 0;
|
1580 |
|
|
/* Make an ERROR chunk, preparing enough room for
|
1581 |
|
|
* returning multiple unknown parameters.
|
1582 |
|
|
*/
|
1583 |
|
|
if (NULL == *errp)
|
1584 |
|
|
*errp = sctp_make_op_error_space(asoc, chunk,
|
1585 |
|
|
ntohs(chunk->chunk_hdr->length));
|
1586 |
|
|
|
1587 |
|
|
if (*errp)
|
1588 |
|
|
sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
|
1589 |
|
|
param.v,
|
1590 |
|
|
WORD_ROUND(ntohs(param.p->length)));
|
1591 |
|
|
|
1592 |
|
|
break;
|
1593 |
|
|
case SCTP_PARAM_ACTION_SKIP:
|
1594 |
|
|
break;
|
1595 |
|
|
case SCTP_PARAM_ACTION_SKIP_ERR:
|
1596 |
|
|
/* Make an ERROR chunk, preparing enough room for
|
1597 |
|
|
* returning multiple unknown parameters.
|
1598 |
|
|
*/
|
1599 |
|
|
if (NULL == *errp)
|
1600 |
|
|
*errp = sctp_make_op_error_space(asoc, chunk,
|
1601 |
|
|
ntohs(chunk->chunk_hdr->length));
|
1602 |
|
|
|
1603 |
|
|
if (*errp) {
|
1604 |
|
|
sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
|
1605 |
|
|
param.v,
|
1606 |
|
|
WORD_ROUND(ntohs(param.p->length)));
|
1607 |
|
|
} else {
|
1608 |
|
|
/* If there is no memory for generating the ERROR
|
1609 |
|
|
* report as specified, an ABORT will be triggered
|
1610 |
|
|
* to the peer and the association won't be
|
1611 |
|
|
* established.
|
1612 |
|
|
*/
|
1613 |
|
|
retval = 0;
|
1614 |
|
|
}
|
1615 |
|
|
|
1616 |
|
|
break;
|
1617 |
|
|
default:
|
1618 |
|
|
break;
|
1619 |
|
|
}
|
1620 |
|
|
|
1621 |
|
|
return retval;
|
1622 |
|
|
}
|
1623 |
|
|
|
1624 |
|
|
/* Find unrecognized parameters in the chunk.
|
1625 |
|
|
* Return values:
|
1626 |
|
|
* 0 - discard the chunk
|
1627 |
|
|
* 1 - continue with the chunk
|
1628 |
|
|
*/
|
1629 |
|
|
static int sctp_verify_param(const struct sctp_association *asoc,
|
1630 |
|
|
union sctp_params param,
|
1631 |
|
|
sctp_cid_t cid,
|
1632 |
|
|
struct sctp_chunk *chunk,
|
1633 |
|
|
struct sctp_chunk **err_chunk)
|
1634 |
|
|
{
|
1635 |
|
|
int retval = 1;
|
1636 |
|
|
|
1637 |
|
|
/* FIXME - This routine is not looking at each parameter per the
|
1638 |
|
|
* chunk type, i.e., unrecognized parameters should be further
|
1639 |
|
|
* identified based on the chunk id.
|
1640 |
|
|
*/
|
1641 |
|
|
|
1642 |
|
|
switch (param.p->type) {
|
1643 |
|
|
case SCTP_PARAM_IPV4_ADDRESS:
|
1644 |
|
|
case SCTP_PARAM_IPV6_ADDRESS:
|
1645 |
|
|
case SCTP_PARAM_COOKIE_PRESERVATIVE:
|
1646 |
|
|
case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
|
1647 |
|
|
case SCTP_PARAM_STATE_COOKIE:
|
1648 |
|
|
case SCTP_PARAM_HEARTBEAT_INFO:
|
1649 |
|
|
case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
|
1650 |
|
|
case SCTP_PARAM_ECN_CAPABLE:
|
1651 |
|
|
break;
|
1652 |
|
|
|
1653 |
|
|
case SCTP_PARAM_HOST_NAME_ADDRESS:
|
1654 |
|
|
/* Tell the peer, we won't support this param. */
|
1655 |
|
|
return sctp_process_hn_param(asoc, param, chunk, err_chunk);
|
1656 |
|
|
default:
|
1657 |
|
|
SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
|
1658 |
|
|
ntohs(param.p->type), cid);
|
1659 |
|
|
return sctp_process_unk_param(asoc, param, chunk, err_chunk);
|
1660 |
|
|
|
1661 |
|
|
break;
|
1662 |
|
|
}
|
1663 |
|
|
return retval;
|
1664 |
|
|
}
|
1665 |
|
|
|
1666 |
|
|
/* Verify the INIT packet before we process it. */
|
1667 |
|
|
int sctp_verify_init(const struct sctp_association *asoc,
|
1668 |
|
|
sctp_cid_t cid,
|
1669 |
|
|
sctp_init_chunk_t *peer_init,
|
1670 |
|
|
struct sctp_chunk *chunk,
|
1671 |
|
|
struct sctp_chunk **errp)
|
1672 |
|
|
{
|
1673 |
|
|
union sctp_params param;
|
1674 |
|
|
int has_cookie = 0;
|
1675 |
|
|
|
1676 |
|
|
/* Verify stream values are non-zero. */
|
1677 |
|
|
if ((0 == peer_init->init_hdr.num_outbound_streams) ||
|
1678 |
|
|
(0 == peer_init->init_hdr.num_inbound_streams)) {
|
1679 |
|
|
|
1680 |
|
|
sctp_process_inv_mandatory(asoc, chunk, errp);
|
1681 |
|
|
return 0;
|
1682 |
|
|
}
|
1683 |
|
|
|
1684 |
|
|
/* Check for missing mandatory parameters. */
|
1685 |
|
|
sctp_walk_params(param, peer_init, init_hdr.params) {
|
1686 |
|
|
|
1687 |
|
|
if (SCTP_PARAM_STATE_COOKIE == param.p->type)
|
1688 |
|
|
has_cookie = 1;
|
1689 |
|
|
|
1690 |
|
|
} /* for (loop through all parameters) */
|
1691 |
|
|
|
1692 |
|
|
/* The only missing mandatory param possible today is
|
1693 |
|
|
* the state cookie for an INIT-ACK chunk.
|
1694 |
|
|
*/
|
1695 |
|
|
if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) {
|
1696 |
|
|
sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
|
1697 |
|
|
chunk, errp);
|
1698 |
|
|
return 0;
|
1699 |
|
|
}
|
1700 |
|
|
|
1701 |
|
|
/* Find unrecognized parameters. */
|
1702 |
|
|
|
1703 |
|
|
sctp_walk_params(param, peer_init, init_hdr.params) {
|
1704 |
|
|
|
1705 |
|
|
if (!sctp_verify_param(asoc, param, cid, chunk, errp)) {
|
1706 |
|
|
if (SCTP_PARAM_HOST_NAME_ADDRESS == param.p->type)
|
1707 |
|
|
return 0;
|
1708 |
|
|
else
|
1709 |
|
|
return 1;
|
1710 |
|
|
}
|
1711 |
|
|
|
1712 |
|
|
} /* for (loop through all parameters) */
|
1713 |
|
|
|
1714 |
|
|
return 1;
|
1715 |
|
|
}
|
1716 |
|
|
|
1717 |
|
|
/* Unpack the parameters in an INIT packet into an association.
|
1718 |
|
|
* Returns 0 on failure, else success.
|
1719 |
|
|
* FIXME: This is an association method.
|
1720 |
|
|
*/
|
1721 |
|
|
int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
|
1722 |
|
|
const union sctp_addr *peer_addr,
|
1723 |
|
|
sctp_init_chunk_t *peer_init, int gfp)
|
1724 |
|
|
{
|
1725 |
|
|
union sctp_params param;
|
1726 |
|
|
struct sctp_transport *transport;
|
1727 |
|
|
struct list_head *pos, *temp;
|
1728 |
|
|
char *cookie;
|
1729 |
|
|
|
1730 |
|
|
/* We must include the address that the INIT packet came from.
|
1731 |
|
|
* This is the only address that matters for an INIT packet.
|
1732 |
|
|
* When processing a COOKIE ECHO, we retrieve the from address
|
1733 |
|
|
* of the INIT from the cookie.
|
1734 |
|
|
*/
|
1735 |
|
|
|
1736 |
|
|
/* This implementation defaults to making the first transport
|
1737 |
|
|
* added as the primary transport. The source address seems to
|
1738 |
|
|
* be a a better choice than any of the embedded addresses.
|
1739 |
|
|
*/
|
1740 |
|
|
if (peer_addr)
|
1741 |
|
|
if(!sctp_assoc_add_peer(asoc, peer_addr, gfp))
|
1742 |
|
|
goto nomem;
|
1743 |
|
|
|
1744 |
|
|
/* Process the initialization parameters. */
|
1745 |
|
|
|
1746 |
|
|
sctp_walk_params(param, peer_init, init_hdr.params) {
|
1747 |
|
|
|
1748 |
|
|
if (!sctp_process_param(asoc, param, peer_addr, gfp))
|
1749 |
|
|
goto clean_up;
|
1750 |
|
|
}
|
1751 |
|
|
|
1752 |
|
|
/* The fixed INIT headers are always in network byte
|
1753 |
|
|
* order.
|
1754 |
|
|
*/
|
1755 |
|
|
asoc->peer.i.init_tag =
|
1756 |
|
|
ntohl(peer_init->init_hdr.init_tag);
|
1757 |
|
|
asoc->peer.i.a_rwnd =
|
1758 |
|
|
ntohl(peer_init->init_hdr.a_rwnd);
|
1759 |
|
|
asoc->peer.i.num_outbound_streams =
|
1760 |
|
|
ntohs(peer_init->init_hdr.num_outbound_streams);
|
1761 |
|
|
asoc->peer.i.num_inbound_streams =
|
1762 |
|
|
ntohs(peer_init->init_hdr.num_inbound_streams);
|
1763 |
|
|
asoc->peer.i.initial_tsn =
|
1764 |
|
|
ntohl(peer_init->init_hdr.initial_tsn);
|
1765 |
|
|
|
1766 |
|
|
/* Apply the upper bounds for output streams based on peer's
|
1767 |
|
|
* number of inbound streams.
|
1768 |
|
|
*/
|
1769 |
|
|
if (asoc->c.sinit_num_ostreams >
|
1770 |
|
|
ntohs(peer_init->init_hdr.num_inbound_streams)) {
|
1771 |
|
|
asoc->c.sinit_num_ostreams =
|
1772 |
|
|
ntohs(peer_init->init_hdr.num_inbound_streams);
|
1773 |
|
|
}
|
1774 |
|
|
|
1775 |
|
|
if (asoc->c.sinit_max_instreams >
|
1776 |
|
|
ntohs(peer_init->init_hdr.num_outbound_streams)) {
|
1777 |
|
|
asoc->c.sinit_max_instreams =
|
1778 |
|
|
ntohs(peer_init->init_hdr.num_outbound_streams);
|
1779 |
|
|
}
|
1780 |
|
|
|
1781 |
|
|
/* Copy Initiation tag from INIT to VT_peer in cookie. */
|
1782 |
|
|
asoc->c.peer_vtag = asoc->peer.i.init_tag;
|
1783 |
|
|
|
1784 |
|
|
/* Peer Rwnd : Current calculated value of the peer's rwnd. */
|
1785 |
|
|
asoc->peer.rwnd = asoc->peer.i.a_rwnd;
|
1786 |
|
|
|
1787 |
|
|
/* Copy cookie in case we need to resend COOKIE-ECHO. */
|
1788 |
|
|
cookie = asoc->peer.cookie;
|
1789 |
|
|
if (cookie) {
|
1790 |
|
|
asoc->peer.cookie = kmalloc(asoc->peer.cookie_len, gfp);
|
1791 |
|
|
if (!asoc->peer.cookie)
|
1792 |
|
|
goto clean_up;
|
1793 |
|
|
memcpy(asoc->peer.cookie, cookie, asoc->peer.cookie_len);
|
1794 |
|
|
}
|
1795 |
|
|
|
1796 |
|
|
/* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
|
1797 |
|
|
* high (for example, implementations MAY use the size of the receiver
|
1798 |
|
|
* advertised window).
|
1799 |
|
|
*/
|
1800 |
|
|
list_for_each(pos, &asoc->peer.transport_addr_list) {
|
1801 |
|
|
transport = list_entry(pos, struct sctp_transport, transports);
|
1802 |
|
|
transport->ssthresh = asoc->peer.i.a_rwnd;
|
1803 |
|
|
}
|
1804 |
|
|
|
1805 |
|
|
/* Set up the TSN tracking pieces. */
|
1806 |
|
|
sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE,
|
1807 |
|
|
asoc->peer.i.initial_tsn);
|
1808 |
|
|
|
1809 |
|
|
/* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
|
1810 |
|
|
*
|
1811 |
|
|
* The stream sequence number in all the streams shall start
|
1812 |
|
|
* from 0 when the association is established. Also, when the
|
1813 |
|
|
* stream sequence number reaches the value 65535 the next
|
1814 |
|
|
* stream sequence number shall be set to 0.
|
1815 |
|
|
*/
|
1816 |
|
|
|
1817 |
|
|
/* Allocate storage for the negotiated streams if it is not a temporary * association.
|
1818 |
|
|
*/
|
1819 |
|
|
if (!asoc->temp) {
|
1820 |
|
|
asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
|
1821 |
|
|
asoc->c.sinit_num_ostreams, gfp);
|
1822 |
|
|
if (!asoc->ssnmap)
|
1823 |
|
|
goto nomem_ssnmap;
|
1824 |
|
|
}
|
1825 |
|
|
|
1826 |
|
|
/* ADDIP Section 4.1 ASCONF Chunk Procedures
|
1827 |
|
|
*
|
1828 |
|
|
* When an endpoint has an ASCONF signaled change to be sent to the
|
1829 |
|
|
* remote endpoint it should do the following:
|
1830 |
|
|
* ...
|
1831 |
|
|
* A2) A serial number should be assigned to the Chunk. The serial
|
1832 |
|
|
* number should be a monotonically increasing number. All serial
|
1833 |
|
|
* numbers are defined to be initialized at the start of the
|
1834 |
|
|
* association to the same value as the Initial TSN.
|
1835 |
|
|
*/
|
1836 |
|
|
asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
|
1837 |
|
|
return 1;
|
1838 |
|
|
|
1839 |
|
|
nomem_ssnmap:
|
1840 |
|
|
clean_up:
|
1841 |
|
|
/* Release the transport structures. */
|
1842 |
|
|
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
|
1843 |
|
|
transport = list_entry(pos, struct sctp_transport, transports);
|
1844 |
|
|
list_del_init(pos);
|
1845 |
|
|
sctp_transport_free(transport);
|
1846 |
|
|
}
|
1847 |
|
|
nomem:
|
1848 |
|
|
return 0;
|
1849 |
|
|
}
|
1850 |
|
|
|
1851 |
|
|
|
1852 |
|
|
/* Update asoc with the option described in param.
|
1853 |
|
|
*
|
1854 |
|
|
* RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
|
1855 |
|
|
*
|
1856 |
|
|
* asoc is the association to update.
|
1857 |
|
|
* param is the variable length parameter to use for update.
|
1858 |
|
|
* cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
|
1859 |
|
|
* If the current packet is an INIT we want to minimize the amount of
|
1860 |
|
|
* work we do. In particular, we should not build transport
|
1861 |
|
|
* structures for the addresses.
|
1862 |
|
|
*/
|
1863 |
|
|
int sctp_process_param(struct sctp_association *asoc, union sctp_params param,
|
1864 |
|
|
const union sctp_addr *peer_addr, int gfp)
|
1865 |
|
|
{
|
1866 |
|
|
union sctp_addr addr;
|
1867 |
|
|
int i;
|
1868 |
|
|
__u16 sat;
|
1869 |
|
|
int retval = 1;
|
1870 |
|
|
sctp_scope_t scope;
|
1871 |
|
|
time_t stale;
|
1872 |
|
|
struct sctp_af *af;
|
1873 |
|
|
|
1874 |
|
|
/* We maintain all INIT parameters in network byte order all the
|
1875 |
|
|
* time. This allows us to not worry about whether the parameters
|
1876 |
|
|
* came from a fresh INIT, and INIT ACK, or were stored in a cookie.
|
1877 |
|
|
*/
|
1878 |
|
|
switch (param.p->type) {
|
1879 |
|
|
case SCTP_PARAM_IPV6_ADDRESS:
|
1880 |
|
|
if (PF_INET6 != asoc->base.sk->sk_family)
|
1881 |
|
|
break;
|
1882 |
|
|
/* Fall through. */
|
1883 |
|
|
case SCTP_PARAM_IPV4_ADDRESS:
|
1884 |
|
|
af = sctp_get_af_specific(param_type2af(param.p->type));
|
1885 |
|
|
af->from_addr_param(&addr, param.addr, asoc->peer.port, 0);
|
1886 |
|
|
scope = sctp_scope(peer_addr);
|
1887 |
|
|
if (sctp_in_scope(&addr, scope))
|
1888 |
|
|
if (!sctp_assoc_add_peer(asoc, &addr, gfp))
|
1889 |
|
|
return 0;
|
1890 |
|
|
break;
|
1891 |
|
|
|
1892 |
|
|
case SCTP_PARAM_COOKIE_PRESERVATIVE:
|
1893 |
|
|
if (!sctp_cookie_preserve_enable)
|
1894 |
|
|
break;
|
1895 |
|
|
|
1896 |
|
|
stale = ntohl(param.life->lifespan_increment);
|
1897 |
|
|
|
1898 |
|
|
/* Suggested Cookie Life span increment's unit is msec,
|
1899 |
|
|
* (1/1000sec).
|
1900 |
|
|
*/
|
1901 |
|
|
asoc->cookie_life.tv_sec += stale / 1000;
|
1902 |
|
|
asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
|
1903 |
|
|
break;
|
1904 |
|
|
|
1905 |
|
|
case SCTP_PARAM_HOST_NAME_ADDRESS:
|
1906 |
|
|
SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
|
1907 |
|
|
break;
|
1908 |
|
|
|
1909 |
|
|
case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
|
1910 |
|
|
/* Turn off the default values first so we'll know which
|
1911 |
|
|
* ones are really set by the peer.
|
1912 |
|
|
*/
|
1913 |
|
|
asoc->peer.ipv4_address = 0;
|
1914 |
|
|
asoc->peer.ipv6_address = 0;
|
1915 |
|
|
|
1916 |
|
|
/* Cycle through address types; avoid divide by 0. */
|
1917 |
|
|
sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
|
1918 |
|
|
if (sat)
|
1919 |
|
|
sat /= sizeof(__u16);
|
1920 |
|
|
|
1921 |
|
|
for (i = 0; i < sat; ++i) {
|
1922 |
|
|
switch (param.sat->types[i]) {
|
1923 |
|
|
case SCTP_PARAM_IPV4_ADDRESS:
|
1924 |
|
|
asoc->peer.ipv4_address = 1;
|
1925 |
|
|
break;
|
1926 |
|
|
|
1927 |
|
|
case SCTP_PARAM_IPV6_ADDRESS:
|
1928 |
|
|
asoc->peer.ipv6_address = 1;
|
1929 |
|
|
break;
|
1930 |
|
|
|
1931 |
|
|
case SCTP_PARAM_HOST_NAME_ADDRESS:
|
1932 |
|
|
asoc->peer.hostname_address = 1;
|
1933 |
|
|
break;
|
1934 |
|
|
|
1935 |
|
|
default: /* Just ignore anything else. */
|
1936 |
|
|
break;
|
1937 |
|
|
};
|
1938 |
|
|
}
|
1939 |
|
|
break;
|
1940 |
|
|
|
1941 |
|
|
case SCTP_PARAM_STATE_COOKIE:
|
1942 |
|
|
asoc->peer.cookie_len =
|
1943 |
|
|
ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
|
1944 |
|
|
asoc->peer.cookie = param.cookie->body;
|
1945 |
|
|
break;
|
1946 |
|
|
|
1947 |
|
|
case SCTP_PARAM_HEARTBEAT_INFO:
|
1948 |
|
|
/* Would be odd to receive, but it causes no problems. */
|
1949 |
|
|
break;
|
1950 |
|
|
|
1951 |
|
|
case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
|
1952 |
|
|
/* Rejected during verify stage. */
|
1953 |
|
|
break;
|
1954 |
|
|
|
1955 |
|
|
case SCTP_PARAM_ECN_CAPABLE:
|
1956 |
|
|
asoc->peer.ecn_capable = 1;
|
1957 |
|
|
break;
|
1958 |
|
|
|
1959 |
|
|
default:
|
1960 |
|
|
/* Any unrecognized parameters should have been caught
|
1961 |
|
|
* and handled by sctp_verify_param() which should be
|
1962 |
|
|
* called prior to this routine. Simply log the error
|
1963 |
|
|
* here.
|
1964 |
|
|
*/
|
1965 |
|
|
SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
|
1966 |
|
|
ntohs(param.p->type), asoc);
|
1967 |
|
|
break;
|
1968 |
|
|
};
|
1969 |
|
|
|
1970 |
|
|
return retval;
|
1971 |
|
|
}
|
1972 |
|
|
|
1973 |
|
|
/* Select a new verification tag. */
|
1974 |
|
|
__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
|
1975 |
|
|
{
|
1976 |
|
|
/* I believe that this random number generator complies with RFC1750.
|
1977 |
|
|
* A tag of 0 is reserved for special cases (e.g. INIT).
|
1978 |
|
|
*/
|
1979 |
|
|
__u32 x;
|
1980 |
|
|
|
1981 |
|
|
do {
|
1982 |
|
|
get_random_bytes(&x, sizeof(__u32));
|
1983 |
|
|
} while (x == 0);
|
1984 |
|
|
|
1985 |
|
|
return x;
|
1986 |
|
|
}
|
1987 |
|
|
|
1988 |
|
|
/* Select an initial TSN to send during startup. */
|
1989 |
|
|
__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
|
1990 |
|
|
{
|
1991 |
|
|
__u32 retval;
|
1992 |
|
|
|
1993 |
|
|
get_random_bytes(&retval, sizeof(__u32));
|
1994 |
|
|
return retval;
|
1995 |
|
|
}
|
1996 |
|
|
|
1997 |
|
|
/*
|
1998 |
|
|
* ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
|
1999 |
|
|
* 0 1 2 3
|
2000 |
|
|
* 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
|
2001 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2002 |
|
|
* | Type = 0xC1 | Chunk Flags | Chunk Length |
|
2003 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2004 |
|
|
* | Serial Number |
|
2005 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2006 |
|
|
* | Address Parameter |
|
2007 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2008 |
|
|
* | ASCONF Parameter #1 |
|
2009 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2010 |
|
|
* \ \
|
2011 |
|
|
* / .... /
|
2012 |
|
|
* \ \
|
2013 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2014 |
|
|
* | ASCONF Parameter #N |
|
2015 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2016 |
|
|
*
|
2017 |
|
|
* Address Parameter and other parameter will not be wrapped in this function
|
2018 |
|
|
*/
|
2019 |
|
|
struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
|
2020 |
|
|
union sctp_addr *addr, int vparam_len)
|
2021 |
|
|
{
|
2022 |
|
|
sctp_addiphdr_t asconf;
|
2023 |
|
|
struct sctp_chunk *retval;
|
2024 |
|
|
int length = sizeof(asconf) + vparam_len;
|
2025 |
|
|
union sctp_addr_param addrparam;
|
2026 |
|
|
int addrlen;
|
2027 |
|
|
struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
|
2028 |
|
|
|
2029 |
|
|
addrlen = af->to_addr_param(addr, &addrparam);
|
2030 |
|
|
if (!addrlen)
|
2031 |
|
|
return NULL;
|
2032 |
|
|
length += addrlen;
|
2033 |
|
|
|
2034 |
|
|
/* Create the chunk. */
|
2035 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
|
2036 |
|
|
if (!retval)
|
2037 |
|
|
return NULL;
|
2038 |
|
|
|
2039 |
|
|
asconf.serial = htonl(asoc->addip_serial++);
|
2040 |
|
|
|
2041 |
|
|
retval->subh.addip_hdr =
|
2042 |
|
|
sctp_addto_chunk(retval, sizeof(asconf), &asconf);
|
2043 |
|
|
retval->param_hdr.v =
|
2044 |
|
|
sctp_addto_chunk(retval, addrlen, &addrparam);
|
2045 |
|
|
|
2046 |
|
|
return retval;
|
2047 |
|
|
}
|
2048 |
|
|
|
2049 |
|
|
/* ADDIP
|
2050 |
|
|
* 3.2.1 Add IP Address
|
2051 |
|
|
* 0 1 2 3
|
2052 |
|
|
* 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
|
2053 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2054 |
|
|
* | Type = 0xC001 | Length = Variable |
|
2055 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2056 |
|
|
* | ASCONF-Request Correlation ID |
|
2057 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2058 |
|
|
* | Address Parameter |
|
2059 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2060 |
|
|
*
|
2061 |
|
|
* 3.2.2 Delete IP Address
|
2062 |
|
|
* 0 1 2 3
|
2063 |
|
|
* 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
|
2064 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2065 |
|
|
* | Type = 0xC002 | Length = Variable |
|
2066 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2067 |
|
|
* | ASCONF-Request Correlation ID |
|
2068 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2069 |
|
|
* | Address Parameter |
|
2070 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2071 |
|
|
*
|
2072 |
|
|
*/
|
2073 |
|
|
struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
|
2074 |
|
|
union sctp_addr *laddr,
|
2075 |
|
|
struct sockaddr *addrs,
|
2076 |
|
|
int addrcnt,
|
2077 |
|
|
__u16 flags)
|
2078 |
|
|
{
|
2079 |
|
|
sctp_addip_param_t param;
|
2080 |
|
|
struct sctp_chunk *retval;
|
2081 |
|
|
union sctp_addr_param addr_param;
|
2082 |
|
|
union sctp_addr *addr;
|
2083 |
|
|
void *addr_buf;
|
2084 |
|
|
struct sctp_af *af;
|
2085 |
|
|
int paramlen = sizeof(param);
|
2086 |
|
|
int addr_param_len = 0;
|
2087 |
|
|
int totallen = 0;
|
2088 |
|
|
int i;
|
2089 |
|
|
|
2090 |
|
|
/* Get total length of all the address parameters. */
|
2091 |
|
|
addr_buf = addrs;
|
2092 |
|
|
for (i = 0; i < addrcnt; i++) {
|
2093 |
|
|
addr = (union sctp_addr *)addr_buf;
|
2094 |
|
|
af = sctp_get_af_specific(addr->v4.sin_family);
|
2095 |
|
|
addr_param_len = af->to_addr_param(addr, &addr_param);
|
2096 |
|
|
|
2097 |
|
|
totallen += paramlen;
|
2098 |
|
|
totallen += addr_param_len;
|
2099 |
|
|
|
2100 |
|
|
addr_buf += af->sockaddr_len;
|
2101 |
|
|
}
|
2102 |
|
|
|
2103 |
|
|
/* Create an asconf chunk with the required length. */
|
2104 |
|
|
retval = sctp_make_asconf(asoc, laddr, totallen);
|
2105 |
|
|
if (!retval)
|
2106 |
|
|
return NULL;
|
2107 |
|
|
|
2108 |
|
|
/* Add the address parameters to the asconf chunk. */
|
2109 |
|
|
addr_buf = addrs;
|
2110 |
|
|
for (i = 0; i < addrcnt; i++) {
|
2111 |
|
|
addr = (union sctp_addr *)addr_buf;
|
2112 |
|
|
af = sctp_get_af_specific(addr->v4.sin_family);
|
2113 |
|
|
addr_param_len = af->to_addr_param(addr, &addr_param);
|
2114 |
|
|
param.param_hdr.type = flags;
|
2115 |
|
|
param.param_hdr.length = htons(paramlen + addr_param_len);
|
2116 |
|
|
param.crr_id = i;
|
2117 |
|
|
|
2118 |
|
|
sctp_addto_chunk(retval, paramlen, ¶m);
|
2119 |
|
|
sctp_addto_chunk(retval, addr_param_len, &addr_param);
|
2120 |
|
|
|
2121 |
|
|
addr_buf += af->sockaddr_len;
|
2122 |
|
|
}
|
2123 |
|
|
return retval;
|
2124 |
|
|
}
|
2125 |
|
|
|
2126 |
|
|
/* ADDIP
|
2127 |
|
|
* 3.2.4 Set Primary IP Address
|
2128 |
|
|
* 0 1 2 3
|
2129 |
|
|
* 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
|
2130 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2131 |
|
|
* | Type =0xC004 | Length = Variable |
|
2132 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2133 |
|
|
* | ASCONF-Request Correlation ID |
|
2134 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2135 |
|
|
* | Address Parameter |
|
2136 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2137 |
|
|
*
|
2138 |
|
|
* Create an ASCONF chunk with Set Primary IP address parameter.
|
2139 |
|
|
*/
|
2140 |
|
|
struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
|
2141 |
|
|
union sctp_addr *addr)
|
2142 |
|
|
{
|
2143 |
|
|
sctp_addip_param_t param;
|
2144 |
|
|
struct sctp_chunk *retval;
|
2145 |
|
|
int len = sizeof(param);
|
2146 |
|
|
union sctp_addr_param addrparam;
|
2147 |
|
|
int addrlen;
|
2148 |
|
|
struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
|
2149 |
|
|
|
2150 |
|
|
addrlen = af->to_addr_param(addr, &addrparam);
|
2151 |
|
|
if (!addrlen)
|
2152 |
|
|
return NULL;
|
2153 |
|
|
len += addrlen;
|
2154 |
|
|
|
2155 |
|
|
/* Create the chunk and make asconf header. */
|
2156 |
|
|
retval = sctp_make_asconf(asoc, addr, len);
|
2157 |
|
|
if (!retval)
|
2158 |
|
|
return NULL;
|
2159 |
|
|
|
2160 |
|
|
param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
|
2161 |
|
|
param.param_hdr.length = htons(len);
|
2162 |
|
|
param.crr_id = 0;
|
2163 |
|
|
|
2164 |
|
|
sctp_addto_chunk(retval, sizeof(param), ¶m);
|
2165 |
|
|
sctp_addto_chunk(retval, addrlen, &addrparam);
|
2166 |
|
|
|
2167 |
|
|
return retval;
|
2168 |
|
|
}
|
2169 |
|
|
|
2170 |
|
|
/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
|
2171 |
|
|
* 0 1 2 3
|
2172 |
|
|
* 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
|
2173 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2174 |
|
|
* | Type = 0x80 | Chunk Flags | Chunk Length |
|
2175 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2176 |
|
|
* | Serial Number |
|
2177 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2178 |
|
|
* | ASCONF Parameter Response#1 |
|
2179 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2180 |
|
|
* \ \
|
2181 |
|
|
* / .... /
|
2182 |
|
|
* \ \
|
2183 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2184 |
|
|
* | ASCONF Parameter Response#N |
|
2185 |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
2186 |
|
|
*
|
2187 |
|
|
* Create an ASCONF_ACK chunk with enough space for the parameter responses.
|
2188 |
|
|
*/
|
2189 |
|
|
struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
|
2190 |
|
|
__u32 serial, int vparam_len)
|
2191 |
|
|
{
|
2192 |
|
|
sctp_addiphdr_t asconf;
|
2193 |
|
|
struct sctp_chunk *retval;
|
2194 |
|
|
int length = sizeof(asconf) + vparam_len;
|
2195 |
|
|
|
2196 |
|
|
/* Create the chunk. */
|
2197 |
|
|
retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
|
2198 |
|
|
if (!retval)
|
2199 |
|
|
return NULL;
|
2200 |
|
|
|
2201 |
|
|
asconf.serial = htonl(serial);
|
2202 |
|
|
|
2203 |
|
|
retval->subh.addip_hdr =
|
2204 |
|
|
sctp_addto_chunk(retval, sizeof(asconf), &asconf);
|
2205 |
|
|
|
2206 |
|
|
return retval;
|
2207 |
|
|
}
|
2208 |
|
|
|
2209 |
|
|
/* Add response parameters to an ASCONF_ACK chunk. */
|
2210 |
|
|
static void sctp_add_asconf_response(struct sctp_chunk *chunk, __u32 crr_id,
|
2211 |
|
|
__u16 err_code, sctp_addip_param_t *asconf_param)
|
2212 |
|
|
{
|
2213 |
|
|
sctp_addip_param_t ack_param;
|
2214 |
|
|
sctp_errhdr_t err_param;
|
2215 |
|
|
int asconf_param_len = 0;
|
2216 |
|
|
int err_param_len = 0;
|
2217 |
|
|
__u16 response_type;
|
2218 |
|
|
|
2219 |
|
|
if (SCTP_ERROR_NO_ERROR == err_code) {
|
2220 |
|
|
response_type = SCTP_PARAM_SUCCESS_REPORT;
|
2221 |
|
|
} else {
|
2222 |
|
|
response_type = SCTP_PARAM_ERR_CAUSE;
|
2223 |
|
|
err_param_len = sizeof(err_param);
|
2224 |
|
|
if (asconf_param)
|
2225 |
|
|
asconf_param_len =
|
2226 |
|
|
ntohs(asconf_param->param_hdr.length);
|
2227 |
|
|
}
|
2228 |
|
|
|
2229 |
|
|
/* Add Success Indication or Error Cause Indication parameter. */
|
2230 |
|
|
ack_param.param_hdr.type = response_type;
|
2231 |
|
|
ack_param.param_hdr.length = htons(sizeof(ack_param) +
|
2232 |
|
|
err_param_len +
|
2233 |
|
|
asconf_param_len);
|
2234 |
|
|
ack_param.crr_id = crr_id;
|
2235 |
|
|
sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
|
2236 |
|
|
|
2237 |
|
|
if (SCTP_ERROR_NO_ERROR == err_code)
|
2238 |
|
|
return;
|
2239 |
|
|
|
2240 |
|
|
/* Add Error Cause parameter. */
|
2241 |
|
|
err_param.cause = err_code;
|
2242 |
|
|
err_param.length = htons(err_param_len + asconf_param_len);
|
2243 |
|
|
sctp_addto_chunk(chunk, err_param_len, &err_param);
|
2244 |
|
|
|
2245 |
|
|
/* Add the failed TLV copied from ASCONF chunk. */
|
2246 |
|
|
if (asconf_param)
|
2247 |
|
|
sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
|
2248 |
|
|
}
|
2249 |
|
|
|
2250 |
|
|
/* Process a asconf parameter. */
|
2251 |
|
|
static __u16 sctp_process_asconf_param(struct sctp_association *asoc,
|
2252 |
|
|
struct sctp_chunk *asconf,
|
2253 |
|
|
sctp_addip_param_t *asconf_param)
|
2254 |
|
|
{
|
2255 |
|
|
struct sctp_transport *peer;
|
2256 |
|
|
struct sctp_af *af;
|
2257 |
|
|
union sctp_addr addr;
|
2258 |
|
|
struct list_head *pos;
|
2259 |
|
|
union sctp_addr_param *addr_param;
|
2260 |
|
|
|
2261 |
|
|
addr_param = (union sctp_addr_param *)
|
2262 |
|
|
((void *)asconf_param + sizeof(sctp_addip_param_t));
|
2263 |
|
|
|
2264 |
|
|
af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
|
2265 |
|
|
if (unlikely(!af))
|
2266 |
|
|
return SCTP_ERROR_INV_PARAM;
|
2267 |
|
|
|
2268 |
|
|
af->from_addr_param(&addr, addr_param, asoc->peer.port, 0);
|
2269 |
|
|
switch (asconf_param->param_hdr.type) {
|
2270 |
|
|
case SCTP_PARAM_ADD_IP:
|
2271 |
|
|
/* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
|
2272 |
|
|
* request and does not have the local resources to add this
|
2273 |
|
|
* new address to the association, it MUST return an Error
|
2274 |
|
|
* Cause TLV set to the new error code 'Operation Refused
|
2275 |
|
|
* Due to Resource Shortage'.
|
2276 |
|
|
*/
|
2277 |
|
|
|
2278 |
|
|
peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC);
|
2279 |
|
|
if (!peer)
|
2280 |
|
|
return SCTP_ERROR_RSRC_LOW;
|
2281 |
|
|
|
2282 |
|
|
/* Start the heartbeat timer. */
|
2283 |
|
|
if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
|
2284 |
|
|
sctp_transport_hold(peer);
|
2285 |
|
|
break;
|
2286 |
|
|
case SCTP_PARAM_DEL_IP:
|
2287 |
|
|
/* ADDIP 4.3 D7) If a request is received to delete the
|
2288 |
|
|
* last remaining IP address of a peer endpoint, the receiver
|
2289 |
|
|
* MUST send an Error Cause TLV with the error cause set to the
|
2290 |
|
|
* new error code 'Request to Delete Last Remaining IP Address'.
|
2291 |
|
|
*/
|
2292 |
|
|
pos = asoc->peer.transport_addr_list.next;
|
2293 |
|
|
if (pos->next == &asoc->peer.transport_addr_list)
|
2294 |
|
|
return SCTP_ERROR_DEL_LAST_IP;
|
2295 |
|
|
|
2296 |
|
|
/* ADDIP 4.3 D8) If a request is received to delete an IP
|
2297 |
|
|
* address which is also the source address of the IP packet
|
2298 |
|
|
* which contained the ASCONF chunk, the receiver MUST reject
|
2299 |
|
|
* this request. To reject the request the receiver MUST send
|
2300 |
|
|
* an Error Cause TLV set to the new error code 'Request to
|
2301 |
|
|
* Delete Source IP Address'
|
2302 |
|
|
*/
|
2303 |
|
|
if (sctp_cmp_addr_exact(sctp_source(asconf), &addr))
|
2304 |
|
|
return SCTP_ERROR_DEL_SRC_IP;
|
2305 |
|
|
|
2306 |
|
|
sctp_assoc_del_peer(asoc, &addr);
|
2307 |
|
|
break;
|
2308 |
|
|
case SCTP_PARAM_SET_PRIMARY:
|
2309 |
|
|
peer = sctp_assoc_lookup_paddr(asoc, &addr);
|
2310 |
|
|
if (!peer)
|
2311 |
|
|
return SCTP_ERROR_INV_PARAM;
|
2312 |
|
|
|
2313 |
|
|
sctp_assoc_set_primary(asoc, peer);
|
2314 |
|
|
break;
|
2315 |
|
|
default:
|
2316 |
|
|
return SCTP_ERROR_INV_PARAM;
|
2317 |
|
|
break;
|
2318 |
|
|
}
|
2319 |
|
|
|
2320 |
|
|
return SCTP_ERROR_NO_ERROR;
|
2321 |
|
|
}
|
2322 |
|
|
|
2323 |
|
|
/* Process an incoming ASCONF chunk with the next expected serial no. and
|
2324 |
|
|
* return an ASCONF_ACK chunk to be sent in response.
|
2325 |
|
|
*/
|
2326 |
|
|
struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
|
2327 |
|
|
struct sctp_chunk *asconf)
|
2328 |
|
|
{
|
2329 |
|
|
sctp_addiphdr_t *hdr;
|
2330 |
|
|
union sctp_addr_param *addr_param;
|
2331 |
|
|
sctp_addip_param_t *asconf_param;
|
2332 |
|
|
struct sctp_chunk *asconf_ack;
|
2333 |
|
|
|
2334 |
|
|
__u16 err_code;
|
2335 |
|
|
int length = 0;
|
2336 |
|
|
int chunk_len = asconf->skb->len;
|
2337 |
|
|
__u32 serial;
|
2338 |
|
|
int all_param_pass = 1;
|
2339 |
|
|
|
2340 |
|
|
hdr = (sctp_addiphdr_t *)asconf->skb->data;
|
2341 |
|
|
serial = ntohl(hdr->serial);
|
2342 |
|
|
|
2343 |
|
|
/* Skip the addiphdr and store a pointer to address parameter. */
|
2344 |
|
|
length = sizeof(sctp_addiphdr_t);
|
2345 |
|
|
addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
|
2346 |
|
|
chunk_len -= length;
|
2347 |
|
|
|
2348 |
|
|
/* Skip the address parameter and store a pointer to the first
|
2349 |
|
|
* asconf paramter.
|
2350 |
|
|
*/
|
2351 |
|
|
length = ntohs(addr_param->v4.param_hdr.length);
|
2352 |
|
|
asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
|
2353 |
|
|
chunk_len -= length;
|
2354 |
|
|
|
2355 |
|
|
/* create an ASCONF_ACK chunk.
|
2356 |
|
|
* Based on the definitions of parameters, we know that the size of
|
2357 |
|
|
* ASCONF_ACK parameters are less than or equal to the twice of ASCONF
|
2358 |
|
|
* paramters.
|
2359 |
|
|
*/
|
2360 |
|
|
asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2);
|
2361 |
|
|
if (!asconf_ack)
|
2362 |
|
|
goto done;
|
2363 |
|
|
|
2364 |
|
|
/* Process the TLVs contained within the ASCONF chunk. */
|
2365 |
|
|
while (chunk_len > 0) {
|
2366 |
|
|
err_code = sctp_process_asconf_param(asoc, asconf,
|
2367 |
|
|
asconf_param);
|
2368 |
|
|
/* ADDIP 4.1 A7)
|
2369 |
|
|
* If an error response is received for a TLV parameter,
|
2370 |
|
|
* all TLVs with no response before the failed TLV are
|
2371 |
|
|
* considered successful if not reported. All TLVs after
|
2372 |
|
|
* the failed response are considered unsuccessful unless
|
2373 |
|
|
* a specific success indication is present for the parameter.
|
2374 |
|
|
*/
|
2375 |
|
|
if (SCTP_ERROR_NO_ERROR != err_code)
|
2376 |
|
|
all_param_pass = 0;
|
2377 |
|
|
|
2378 |
|
|
if (!all_param_pass)
|
2379 |
|
|
sctp_add_asconf_response(asconf_ack,
|
2380 |
|
|
asconf_param->crr_id, err_code,
|
2381 |
|
|
asconf_param);
|
2382 |
|
|
|
2383 |
|
|
/* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
|
2384 |
|
|
* an IP address sends an 'Out of Resource' in its response, it
|
2385 |
|
|
* MUST also fail any subsequent add or delete requests bundled
|
2386 |
|
|
* in the ASCONF.
|
2387 |
|
|
*/
|
2388 |
|
|
if (SCTP_ERROR_RSRC_LOW == err_code)
|
2389 |
|
|
goto done;
|
2390 |
|
|
|
2391 |
|
|
/* Move to the next ASCONF param. */
|
2392 |
|
|
length = ntohs(asconf_param->param_hdr.length);
|
2393 |
|
|
asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
|
2394 |
|
|
length);
|
2395 |
|
|
chunk_len -= length;
|
2396 |
|
|
}
|
2397 |
|
|
|
2398 |
|
|
done:
|
2399 |
|
|
asoc->peer.addip_serial++;
|
2400 |
|
|
|
2401 |
|
|
/* If we are sending a new ASCONF_ACK hold a reference to it in assoc
|
2402 |
|
|
* after freeing the reference to old asconf ack if any.
|
2403 |
|
|
*/
|
2404 |
|
|
if (asconf_ack) {
|
2405 |
|
|
if (asoc->addip_last_asconf_ack)
|
2406 |
|
|
sctp_chunk_free(asoc->addip_last_asconf_ack);
|
2407 |
|
|
|
2408 |
|
|
sctp_chunk_hold(asconf_ack);
|
2409 |
|
|
asoc->addip_last_asconf_ack = asconf_ack;
|
2410 |
|
|
}
|
2411 |
|
|
|
2412 |
|
|
return asconf_ack;
|
2413 |
|
|
}
|
2414 |
|
|
|
2415 |
|
|
/* Process a asconf parameter that is successfully acked. */
|
2416 |
|
|
static int sctp_asconf_param_success(struct sctp_association *asoc,
|
2417 |
|
|
sctp_addip_param_t *asconf_param)
|
2418 |
|
|
{
|
2419 |
|
|
struct sctp_af *af;
|
2420 |
|
|
union sctp_addr addr;
|
2421 |
|
|
struct sctp_bind_addr *bp = &asoc->base.bind_addr;
|
2422 |
|
|
union sctp_addr_param *addr_param;
|
2423 |
|
|
int retval = 0;
|
2424 |
|
|
|
2425 |
|
|
addr_param = (union sctp_addr_param *)
|
2426 |
|
|
((void *)asconf_param + sizeof(sctp_addip_param_t));
|
2427 |
|
|
|
2428 |
|
|
/* We have checked the packet before, so we do not check again. */
|
2429 |
|
|
af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
|
2430 |
|
|
af->from_addr_param(&addr, addr_param, bp->port, 0);
|
2431 |
|
|
|
2432 |
|
|
switch (asconf_param->param_hdr.type) {
|
2433 |
|
|
case SCTP_PARAM_ADD_IP:
|
2434 |
|
|
sctp_local_bh_disable();
|
2435 |
|
|
sctp_write_lock(&asoc->base.addr_lock);
|
2436 |
|
|
retval = sctp_add_bind_addr(bp, &addr, GFP_ATOMIC);
|
2437 |
|
|
sctp_write_unlock(&asoc->base.addr_lock);
|
2438 |
|
|
sctp_local_bh_enable();
|
2439 |
|
|
break;
|
2440 |
|
|
case SCTP_PARAM_DEL_IP:
|
2441 |
|
|
sctp_local_bh_disable();
|
2442 |
|
|
sctp_write_lock(&asoc->base.addr_lock);
|
2443 |
|
|
retval = sctp_del_bind_addr(bp, &addr);
|
2444 |
|
|
sctp_write_unlock(&asoc->base.addr_lock);
|
2445 |
|
|
sctp_local_bh_enable();
|
2446 |
|
|
break;
|
2447 |
|
|
default:
|
2448 |
|
|
break;
|
2449 |
|
|
}
|
2450 |
|
|
|
2451 |
|
|
return retval;
|
2452 |
|
|
}
|
2453 |
|
|
|
2454 |
|
|
/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
|
2455 |
|
|
* for the given asconf parameter. If there is no response for this parameter,
|
2456 |
|
|
* return the error code based on the third argument 'no_err'.
|
2457 |
|
|
* ADDIP 4.1
|
2458 |
|
|
* A7) If an error response is received for a TLV parameter, all TLVs with no
|
2459 |
|
|
* response before the failed TLV are considered successful if not reported.
|
2460 |
|
|
* All TLVs after the failed response are considered unsuccessful unless a
|
2461 |
|
|
* specific success indication is present for the parameter.
|
2462 |
|
|
*/
|
2463 |
|
|
static __u16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
|
2464 |
|
|
sctp_addip_param_t *asconf_param,
|
2465 |
|
|
int no_err)
|
2466 |
|
|
{
|
2467 |
|
|
sctp_addip_param_t *asconf_ack_param;
|
2468 |
|
|
sctp_errhdr_t *err_param;
|
2469 |
|
|
int length;
|
2470 |
|
|
int asconf_ack_len = asconf_ack->skb->len;
|
2471 |
|
|
__u16 err_code;
|
2472 |
|
|
|
2473 |
|
|
if (no_err)
|
2474 |
|
|
err_code = SCTP_ERROR_NO_ERROR;
|
2475 |
|
|
else
|
2476 |
|
|
err_code = SCTP_ERROR_REQ_REFUSED;
|
2477 |
|
|
|
2478 |
|
|
/* Skip the addiphdr from the asconf_ack chunk and store a pointer to
|
2479 |
|
|
* the first asconf_ack parameter.
|
2480 |
|
|
*/
|
2481 |
|
|
length = sizeof(sctp_addiphdr_t);
|
2482 |
|
|
asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
|
2483 |
|
|
length);
|
2484 |
|
|
asconf_ack_len -= length;
|
2485 |
|
|
|
2486 |
|
|
while (asconf_ack_len > 0) {
|
2487 |
|
|
if (asconf_ack_param->crr_id == asconf_param->crr_id) {
|
2488 |
|
|
switch(asconf_ack_param->param_hdr.type) {
|
2489 |
|
|
case SCTP_PARAM_SUCCESS_REPORT:
|
2490 |
|
|
return SCTP_ERROR_NO_ERROR;
|
2491 |
|
|
case SCTP_PARAM_ERR_CAUSE:
|
2492 |
|
|
length = sizeof(sctp_addip_param_t);
|
2493 |
|
|
err_param = (sctp_errhdr_t *)
|
2494 |
|
|
((void *)asconf_ack_param + length);
|
2495 |
|
|
asconf_ack_len -= length;
|
2496 |
|
|
if (asconf_ack_len > 0)
|
2497 |
|
|
return err_param->cause;
|
2498 |
|
|
else
|
2499 |
|
|
return SCTP_ERROR_INV_PARAM;
|
2500 |
|
|
break;
|
2501 |
|
|
default:
|
2502 |
|
|
return SCTP_ERROR_INV_PARAM;
|
2503 |
|
|
}
|
2504 |
|
|
}
|
2505 |
|
|
|
2506 |
|
|
length = ntohs(asconf_ack_param->param_hdr.length);
|
2507 |
|
|
asconf_ack_param = (sctp_addip_param_t *)
|
2508 |
|
|
((void *)asconf_ack_param + length);
|
2509 |
|
|
asconf_ack_len -= length;
|
2510 |
|
|
}
|
2511 |
|
|
|
2512 |
|
|
return err_code;
|
2513 |
|
|
}
|
2514 |
|
|
|
2515 |
|
|
/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
|
2516 |
|
|
int sctp_process_asconf_ack(struct sctp_association *asoc,
|
2517 |
|
|
struct sctp_chunk *asconf_ack)
|
2518 |
|
|
{
|
2519 |
|
|
struct sctp_chunk *asconf = asoc->addip_last_asconf;
|
2520 |
|
|
union sctp_addr_param *addr_param;
|
2521 |
|
|
sctp_addip_param_t *asconf_param;
|
2522 |
|
|
int length = 0;
|
2523 |
|
|
int asconf_len = asconf->skb->len;
|
2524 |
|
|
int all_param_pass = 0;
|
2525 |
|
|
int no_err = 1;
|
2526 |
|
|
int retval = 0;
|
2527 |
|
|
__u16 err_code = SCTP_ERROR_NO_ERROR;
|
2528 |
|
|
|
2529 |
|
|
/* Skip the chunkhdr and addiphdr from the last asconf sent and store
|
2530 |
|
|
* a pointer to address parameter.
|
2531 |
|
|
*/
|
2532 |
|
|
length = sizeof(sctp_addip_chunk_t);
|
2533 |
|
|
addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
|
2534 |
|
|
asconf_len -= length;
|
2535 |
|
|
|
2536 |
|
|
/* Skip the address parameter in the last asconf sent and store a
|
2537 |
|
|
* pointer to the first asconf paramter.
|
2538 |
|
|
*/
|
2539 |
|
|
length = ntohs(addr_param->v4.param_hdr.length);
|
2540 |
|
|
asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
|
2541 |
|
|
asconf_len -= length;
|
2542 |
|
|
|
2543 |
|
|
/* ADDIP 4.1
|
2544 |
|
|
* A8) If there is no response(s) to specific TLV parameter(s), and no
|
2545 |
|
|
* failures are indicated, then all request(s) are considered
|
2546 |
|
|
* successful.
|
2547 |
|
|
*/
|
2548 |
|
|
if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
|
2549 |
|
|
all_param_pass = 1;
|
2550 |
|
|
|
2551 |
|
|
/* Process the TLVs contained in the last sent ASCONF chunk. */
|
2552 |
|
|
while (asconf_len > 0) {
|
2553 |
|
|
if (all_param_pass)
|
2554 |
|
|
err_code = SCTP_ERROR_NO_ERROR;
|
2555 |
|
|
else {
|
2556 |
|
|
err_code = sctp_get_asconf_response(asconf_ack,
|
2557 |
|
|
asconf_param,
|
2558 |
|
|
no_err);
|
2559 |
|
|
if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
|
2560 |
|
|
no_err = 0;
|
2561 |
|
|
}
|
2562 |
|
|
|
2563 |
|
|
switch (err_code) {
|
2564 |
|
|
case SCTP_ERROR_NO_ERROR:
|
2565 |
|
|
retval = sctp_asconf_param_success(asoc, asconf_param);
|
2566 |
|
|
break;
|
2567 |
|
|
|
2568 |
|
|
case SCTP_ERROR_RSRC_LOW:
|
2569 |
|
|
retval = 1;
|
2570 |
|
|
break;
|
2571 |
|
|
|
2572 |
|
|
case SCTP_ERROR_INV_PARAM:
|
2573 |
|
|
/* Disable sending this type of asconf parameter in
|
2574 |
|
|
* future.
|
2575 |
|
|
*/
|
2576 |
|
|
asoc->peer.addip_disabled_mask |=
|
2577 |
|
|
asconf_param->param_hdr.type;
|
2578 |
|
|
break;
|
2579 |
|
|
|
2580 |
|
|
case SCTP_ERROR_REQ_REFUSED:
|
2581 |
|
|
case SCTP_ERROR_DEL_LAST_IP:
|
2582 |
|
|
case SCTP_ERROR_DEL_SRC_IP:
|
2583 |
|
|
default:
|
2584 |
|
|
break;
|
2585 |
|
|
}
|
2586 |
|
|
|
2587 |
|
|
/* Skip the processed asconf parameter and move to the next
|
2588 |
|
|
* one.
|
2589 |
|
|
*/
|
2590 |
|
|
length = ntohs(asconf_param->param_hdr.length);
|
2591 |
|
|
asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
|
2592 |
|
|
length);
|
2593 |
|
|
asconf_len -= length;
|
2594 |
|
|
}
|
2595 |
|
|
|
2596 |
|
|
/* Free the cached last sent asconf chunk. */
|
2597 |
|
|
sctp_chunk_free(asconf);
|
2598 |
|
|
asoc->addip_last_asconf = NULL;
|
2599 |
|
|
|
2600 |
|
|
/* Send the next asconf chunk from the addip chunk queue. */
|
2601 |
|
|
asconf = (struct sctp_chunk *)__skb_dequeue(&asoc->addip_chunks);
|
2602 |
|
|
if (asconf) {
|
2603 |
|
|
/* Hold the chunk until an ASCONF_ACK is received. */
|
2604 |
|
|
sctp_chunk_hold(asconf);
|
2605 |
|
|
if (sctp_primitive_ASCONF(asoc, asconf))
|
2606 |
|
|
sctp_chunk_free(asconf);
|
2607 |
|
|
else
|
2608 |
|
|
asoc->addip_last_asconf = asconf;
|
2609 |
|
|
}
|
2610 |
|
|
|
2611 |
|
|
return retval;
|
2612 |
|
|
}
|