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1 /* SCTP kernel reference Implementation |
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2 * (C) Copyright IBM Corp. 2001, 2004 |
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3 * Copyright (c) 1999-2000 Cisco, Inc. |
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4 * Copyright (c) 1999-2001 Motorola, Inc. |
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5 * Copyright (c) 2001 Intel Corp. |
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6 * Copyright (c) 2001 Nokia, Inc. |
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7 * Copyright (c) 2001 La Monte H.P. Yarroll |
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8 * |
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9 * This file is part of the SCTP kernel reference Implementation |
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10 * |
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11 * Various protocol defined structures. |
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12 * |
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13 * This SCTP implementation is free software; |
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14 * you can redistribute it and/or modify it under the terms of |
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15 * the GNU General Public License as published by |
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16 * the Free Software Foundation; either version 2, or (at your option) |
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17 * any later version. |
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18 * |
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19 * This SCTP implementation is distributed in the hope that it |
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20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
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21 * ************************ |
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22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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23 * See the GNU General Public License for more details. |
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24 * |
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25 * You should have received a copy of the GNU General Public License |
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26 * along with GNU CC; see the file COPYING. If not, write to |
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27 * the Free Software Foundation, 59 Temple Place - Suite 330, |
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28 * Boston, MA 02111-1307, USA. |
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29 * |
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30 * Please send any bug reports or fixes you make to the |
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31 * email address(es): |
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32 * lksctp developers <lksctp-developerst@lists.sourceforge.net> |
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33 * |
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34 * Or submit a bug report through the following website: |
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35 * http://www.sf.net/projects/lksctp |
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36 * |
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37 * Written or modified by: |
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38 * La Monte H.P. Yarroll <piggy@acm.org> |
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39 * Karl Knutson <karl@athena.chicago.il.us> |
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40 * Jon Grimm <jgrimm@us.ibm.com> |
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41 * Xingang Guo <xingang.guo@intel.com> |
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42 * randall@sctp.chicago.il.us |
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43 * kmorneau@cisco.com |
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44 * qxie1@email.mot.com |
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45 * Sridhar Samudrala <sri@us.ibm.com> |
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46 * Kevin Gao <kevin.gao@intel.com> |
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47 * |
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48 * Any bugs reported given to us we will try to fix... any fixes shared will |
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49 * be incorporated into the next SCTP release. |
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50 */ |
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51 #ifndef __LINUX_SCTP_H__ |
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52 #define __LINUX_SCTP_H__ |
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53 |
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54 #include <linux/in.h> /* We need in_addr. */ |
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55 #include <linux/in6.h> /* We need in6_addr. */ |
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56 |
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57 |
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58 /* Section 3.1. SCTP Common Header Format */ |
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59 typedef struct sctphdr { |
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60 __be16 source; |
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61 __be16 dest; |
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62 __be32 vtag; |
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63 __be32 checksum; |
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64 } __attribute__((packed)) sctp_sctphdr_t; |
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65 |
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66 #ifdef __KERNEL__ |
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67 #include <linux/skbuff.h> |
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68 |
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69 static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb) |
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70 { |
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71 return (struct sctphdr *)skb_transport_header(skb); |
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72 } |
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73 #endif |
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74 |
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75 /* Section 3.2. Chunk Field Descriptions. */ |
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76 typedef struct sctp_chunkhdr { |
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77 __u8 type; |
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78 __u8 flags; |
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79 __be16 length; |
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80 } __attribute__((packed)) sctp_chunkhdr_t; |
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81 |
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82 |
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83 /* Section 3.2. Chunk Type Values. |
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84 * [Chunk Type] identifies the type of information contained in the Chunk |
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85 * Value field. It takes a value from 0 to 254. The value of 255 is |
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86 * reserved for future use as an extension field. |
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87 */ |
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88 typedef enum { |
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89 SCTP_CID_DATA = 0, |
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90 SCTP_CID_INIT = 1, |
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91 SCTP_CID_INIT_ACK = 2, |
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92 SCTP_CID_SACK = 3, |
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93 SCTP_CID_HEARTBEAT = 4, |
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94 SCTP_CID_HEARTBEAT_ACK = 5, |
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95 SCTP_CID_ABORT = 6, |
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96 SCTP_CID_SHUTDOWN = 7, |
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97 SCTP_CID_SHUTDOWN_ACK = 8, |
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98 SCTP_CID_ERROR = 9, |
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99 SCTP_CID_COOKIE_ECHO = 10, |
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100 SCTP_CID_COOKIE_ACK = 11, |
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101 SCTP_CID_ECN_ECNE = 12, |
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102 SCTP_CID_ECN_CWR = 13, |
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103 SCTP_CID_SHUTDOWN_COMPLETE = 14, |
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104 |
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105 /* AUTH Extension Section 4.1 */ |
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106 SCTP_CID_AUTH = 0x0F, |
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107 |
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108 /* PR-SCTP Sec 3.2 */ |
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109 SCTP_CID_FWD_TSN = 0xC0, |
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110 |
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111 /* Use hex, as defined in ADDIP sec. 3.1 */ |
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112 SCTP_CID_ASCONF = 0xC1, |
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113 SCTP_CID_ASCONF_ACK = 0x80, |
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114 } sctp_cid_t; /* enum */ |
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115 |
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116 |
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117 /* Section 3.2 |
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118 * Chunk Types are encoded such that the highest-order two bits specify |
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119 * the action that must be taken if the processing endpoint does not |
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120 * recognize the Chunk Type. |
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121 */ |
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122 typedef enum { |
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123 SCTP_CID_ACTION_DISCARD = 0x00, |
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124 SCTP_CID_ACTION_DISCARD_ERR = 0x40, |
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125 SCTP_CID_ACTION_SKIP = 0x80, |
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126 SCTP_CID_ACTION_SKIP_ERR = 0xc0, |
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127 } sctp_cid_action_t; |
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128 |
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129 enum { SCTP_CID_ACTION_MASK = 0xc0, }; |
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130 |
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131 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE. |
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132 * |
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133 * 3.3.7 Abort Association (ABORT) (6): |
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134 * The T bit is set to 0 if the sender had a TCB that it destroyed. |
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135 * If the sender did not have a TCB it should set this bit to 1. |
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136 */ |
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137 enum { SCTP_CHUNK_FLAG_T = 0x01 }; |
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138 |
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139 /* |
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140 * Set the T bit |
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141 * |
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142 * 0 1 2 3 |
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143 * 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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144 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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145 * | Type = 14 |Reserved |T| Length = 4 | |
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146 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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147 * |
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148 * Chunk Flags: 8 bits |
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149 * |
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150 * Reserved: 7 bits |
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151 * Set to 0 on transmit and ignored on receipt. |
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152 * |
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153 * T bit: 1 bit |
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154 * The T bit is set to 0 if the sender had a TCB that it destroyed. If |
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155 * the sender did NOT have a TCB it should set this bit to 1. |
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156 * |
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157 * Note: Special rules apply to this chunk for verification, please |
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158 * see Section 8.5.1 for details. |
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159 */ |
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160 |
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161 #define sctp_test_T_bit(c) ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T) |
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162 |
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163 /* RFC 2960 |
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164 * Section 3.2.1 Optional/Variable-length Parmaeter Format. |
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165 */ |
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166 |
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167 typedef struct sctp_paramhdr { |
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168 __be16 type; |
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169 __be16 length; |
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170 } __attribute__((packed)) sctp_paramhdr_t; |
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171 |
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172 typedef enum { |
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173 |
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174 /* RFC 2960 Section 3.3.5 */ |
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175 SCTP_PARAM_HEARTBEAT_INFO = __constant_htons(1), |
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176 /* RFC 2960 Section 3.3.2.1 */ |
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177 SCTP_PARAM_IPV4_ADDRESS = __constant_htons(5), |
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178 SCTP_PARAM_IPV6_ADDRESS = __constant_htons(6), |
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179 SCTP_PARAM_STATE_COOKIE = __constant_htons(7), |
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180 SCTP_PARAM_UNRECOGNIZED_PARAMETERS = __constant_htons(8), |
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181 SCTP_PARAM_COOKIE_PRESERVATIVE = __constant_htons(9), |
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182 SCTP_PARAM_HOST_NAME_ADDRESS = __constant_htons(11), |
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183 SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = __constant_htons(12), |
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184 SCTP_PARAM_ECN_CAPABLE = __constant_htons(0x8000), |
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185 |
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186 /* AUTH Extension Section 3 */ |
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187 SCTP_PARAM_RANDOM = __constant_htons(0x8002), |
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188 SCTP_PARAM_CHUNKS = __constant_htons(0x8003), |
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189 SCTP_PARAM_HMAC_ALGO = __constant_htons(0x8004), |
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190 |
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191 /* Add-IP: Supported Extensions, Section 4.2 */ |
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192 SCTP_PARAM_SUPPORTED_EXT = __constant_htons(0x8008), |
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193 |
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194 /* PR-SCTP Sec 3.1 */ |
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195 SCTP_PARAM_FWD_TSN_SUPPORT = __constant_htons(0xc000), |
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196 |
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197 /* Add-IP Extension. Section 3.2 */ |
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198 SCTP_PARAM_ADD_IP = __constant_htons(0xc001), |
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199 SCTP_PARAM_DEL_IP = __constant_htons(0xc002), |
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200 SCTP_PARAM_ERR_CAUSE = __constant_htons(0xc003), |
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201 SCTP_PARAM_SET_PRIMARY = __constant_htons(0xc004), |
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202 SCTP_PARAM_SUCCESS_REPORT = __constant_htons(0xc005), |
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203 SCTP_PARAM_ADAPTATION_LAYER_IND = __constant_htons(0xc006), |
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204 |
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205 } sctp_param_t; /* enum */ |
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206 |
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207 |
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208 /* RFC 2960 Section 3.2.1 |
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209 * The Parameter Types are encoded such that the highest-order two bits |
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210 * specify the action that must be taken if the processing endpoint does |
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211 * not recognize the Parameter Type. |
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212 * |
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213 */ |
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214 typedef enum { |
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215 SCTP_PARAM_ACTION_DISCARD = __constant_htons(0x0000), |
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216 SCTP_PARAM_ACTION_DISCARD_ERR = __constant_htons(0x4000), |
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217 SCTP_PARAM_ACTION_SKIP = __constant_htons(0x8000), |
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218 SCTP_PARAM_ACTION_SKIP_ERR = __constant_htons(0xc000), |
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219 } sctp_param_action_t; |
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220 |
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221 enum { SCTP_PARAM_ACTION_MASK = __constant_htons(0xc000), }; |
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222 |
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223 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */ |
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224 |
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225 typedef struct sctp_datahdr { |
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226 __be32 tsn; |
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227 __be16 stream; |
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228 __be16 ssn; |
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229 __be32 ppid; |
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230 __u8 payload[0]; |
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231 } __attribute__((packed)) sctp_datahdr_t; |
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232 |
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233 typedef struct sctp_data_chunk { |
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234 sctp_chunkhdr_t chunk_hdr; |
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235 sctp_datahdr_t data_hdr; |
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236 } __attribute__((packed)) sctp_data_chunk_t; |
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237 |
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238 /* DATA Chuck Specific Flags */ |
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239 enum { |
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240 SCTP_DATA_MIDDLE_FRAG = 0x00, |
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241 SCTP_DATA_LAST_FRAG = 0x01, |
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242 SCTP_DATA_FIRST_FRAG = 0x02, |
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243 SCTP_DATA_NOT_FRAG = 0x03, |
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244 SCTP_DATA_UNORDERED = 0x04, |
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245 }; |
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246 enum { SCTP_DATA_FRAG_MASK = 0x03, }; |
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247 |
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248 |
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249 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1) |
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250 * |
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251 * This chunk is used to initiate a SCTP association between two |
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252 * endpoints. |
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253 */ |
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254 typedef struct sctp_inithdr { |
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255 __be32 init_tag; |
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256 __be32 a_rwnd; |
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257 __be16 num_outbound_streams; |
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258 __be16 num_inbound_streams; |
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259 __be32 initial_tsn; |
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260 __u8 params[0]; |
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261 } __attribute__((packed)) sctp_inithdr_t; |
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262 |
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263 typedef struct sctp_init_chunk { |
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264 sctp_chunkhdr_t chunk_hdr; |
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265 sctp_inithdr_t init_hdr; |
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266 } __attribute__((packed)) sctp_init_chunk_t; |
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267 |
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268 |
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269 /* Section 3.3.2.1. IPv4 Address Parameter (5) */ |
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270 typedef struct sctp_ipv4addr_param { |
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271 sctp_paramhdr_t param_hdr; |
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272 struct in_addr addr; |
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273 } __attribute__((packed)) sctp_ipv4addr_param_t; |
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274 |
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275 /* Section 3.3.2.1. IPv6 Address Parameter (6) */ |
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276 typedef struct sctp_ipv6addr_param { |
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277 sctp_paramhdr_t param_hdr; |
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278 struct in6_addr addr; |
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279 } __attribute__((packed)) sctp_ipv6addr_param_t; |
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280 |
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281 /* Section 3.3.2.1 Cookie Preservative (9) */ |
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282 typedef struct sctp_cookie_preserve_param { |
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283 sctp_paramhdr_t param_hdr; |
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284 __be32 lifespan_increment; |
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285 } __attribute__((packed)) sctp_cookie_preserve_param_t; |
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286 |
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287 /* Section 3.3.2.1 Host Name Address (11) */ |
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288 typedef struct sctp_hostname_param { |
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289 sctp_paramhdr_t param_hdr; |
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290 uint8_t hostname[0]; |
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291 } __attribute__((packed)) sctp_hostname_param_t; |
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292 |
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293 /* Section 3.3.2.1 Supported Address Types (12) */ |
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294 typedef struct sctp_supported_addrs_param { |
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295 sctp_paramhdr_t param_hdr; |
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296 __be16 types[0]; |
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297 } __attribute__((packed)) sctp_supported_addrs_param_t; |
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298 |
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299 /* Appendix A. ECN Capable (32768) */ |
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300 typedef struct sctp_ecn_capable_param { |
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301 sctp_paramhdr_t param_hdr; |
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302 } __attribute__((packed)) sctp_ecn_capable_param_t; |
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303 |
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304 /* ADDIP Section 3.2.6 Adaptation Layer Indication */ |
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305 typedef struct sctp_adaptation_ind_param { |
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306 struct sctp_paramhdr param_hdr; |
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307 __be32 adaptation_ind; |
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308 } __attribute__((packed)) sctp_adaptation_ind_param_t; |
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309 |
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310 /* ADDIP Section 4.2.7 Supported Extensions Parameter */ |
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311 typedef struct sctp_supported_ext_param { |
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312 struct sctp_paramhdr param_hdr; |
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313 __u8 chunks[0]; |
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314 } __attribute__((packed)) sctp_supported_ext_param_t; |
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315 |
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316 /* AUTH Section 3.1 Random */ |
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317 typedef struct sctp_random_param { |
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318 sctp_paramhdr_t param_hdr; |
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319 __u8 random_val[0]; |
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320 } __attribute__((packed)) sctp_random_param_t; |
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321 |
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322 /* AUTH Section 3.2 Chunk List */ |
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323 typedef struct sctp_chunks_param { |
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324 sctp_paramhdr_t param_hdr; |
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325 __u8 chunks[0]; |
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326 } __attribute__((packed)) sctp_chunks_param_t; |
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327 |
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328 /* AUTH Section 3.3 HMAC Algorithm */ |
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329 typedef struct sctp_hmac_algo_param { |
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330 sctp_paramhdr_t param_hdr; |
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331 __be16 hmac_ids[0]; |
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332 } __attribute__((packed)) sctp_hmac_algo_param_t; |
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333 |
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334 /* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2): |
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335 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP |
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336 * association. |
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337 */ |
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338 typedef sctp_init_chunk_t sctp_initack_chunk_t; |
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339 |
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340 /* Section 3.3.3.1 State Cookie (7) */ |
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341 typedef struct sctp_cookie_param { |
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342 sctp_paramhdr_t p; |
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343 __u8 body[0]; |
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344 } __attribute__((packed)) sctp_cookie_param_t; |
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345 |
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346 /* Section 3.3.3.1 Unrecognized Parameters (8) */ |
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347 typedef struct sctp_unrecognized_param { |
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348 sctp_paramhdr_t param_hdr; |
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349 sctp_paramhdr_t unrecognized; |
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350 } __attribute__((packed)) sctp_unrecognized_param_t; |
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351 |
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352 |
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353 |
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354 /* |
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355 * 3.3.4 Selective Acknowledgement (SACK) (3): |
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356 * |
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357 * This chunk is sent to the peer endpoint to acknowledge received DATA |
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358 * chunks and to inform the peer endpoint of gaps in the received |
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359 * subsequences of DATA chunks as represented by their TSNs. |
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360 */ |
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361 |
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362 typedef struct sctp_gap_ack_block { |
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363 __be16 start; |
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364 __be16 end; |
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365 } __attribute__((packed)) sctp_gap_ack_block_t; |
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366 |
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367 typedef __be32 sctp_dup_tsn_t; |
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368 |
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369 typedef union { |
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370 sctp_gap_ack_block_t gab; |
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371 sctp_dup_tsn_t dup; |
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372 } sctp_sack_variable_t; |
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373 |
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374 typedef struct sctp_sackhdr { |
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375 __be32 cum_tsn_ack; |
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376 __be32 a_rwnd; |
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377 __be16 num_gap_ack_blocks; |
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378 __be16 num_dup_tsns; |
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379 sctp_sack_variable_t variable[0]; |
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380 } __attribute__((packed)) sctp_sackhdr_t; |
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381 |
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382 typedef struct sctp_sack_chunk { |
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383 sctp_chunkhdr_t chunk_hdr; |
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384 sctp_sackhdr_t sack_hdr; |
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385 } __attribute__((packed)) sctp_sack_chunk_t; |
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386 |
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387 |
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388 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4): |
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389 * |
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390 * An endpoint should send this chunk to its peer endpoint to probe the |
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391 * reachability of a particular destination transport address defined in |
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392 * the present association. |
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393 */ |
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394 |
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395 typedef struct sctp_heartbeathdr { |
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396 sctp_paramhdr_t info; |
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397 } __attribute__((packed)) sctp_heartbeathdr_t; |
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398 |
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399 typedef struct sctp_heartbeat_chunk { |
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400 sctp_chunkhdr_t chunk_hdr; |
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401 sctp_heartbeathdr_t hb_hdr; |
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402 } __attribute__((packed)) sctp_heartbeat_chunk_t; |
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403 |
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404 |
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405 /* For the abort and shutdown ACK we must carry the init tag in the |
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406 * common header. Just the common header is all that is needed with a |
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407 * chunk descriptor. |
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408 */ |
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409 typedef struct sctp_abort_chunk { |
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410 sctp_chunkhdr_t uh; |
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411 } __attribute__((packed)) sctp_abort_chunk_t; |
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412 |
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413 |
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414 /* For the graceful shutdown we must carry the tag (in common header) |
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415 * and the highest consecutive acking value. |
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416 */ |
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417 typedef struct sctp_shutdownhdr { |
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418 __be32 cum_tsn_ack; |
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419 } __attribute__((packed)) sctp_shutdownhdr_t; |
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420 |
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421 struct sctp_shutdown_chunk_t { |
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422 sctp_chunkhdr_t chunk_hdr; |
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423 sctp_shutdownhdr_t shutdown_hdr; |
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424 } __attribute__ ((packed)); |
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425 |
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426 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */ |
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427 |
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428 typedef struct sctp_errhdr { |
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429 __be16 cause; |
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430 __be16 length; |
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431 __u8 variable[0]; |
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432 } __attribute__((packed)) sctp_errhdr_t; |
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433 |
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434 typedef struct sctp_operr_chunk { |
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435 sctp_chunkhdr_t chunk_hdr; |
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436 sctp_errhdr_t err_hdr; |
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437 } __attribute__((packed)) sctp_operr_chunk_t; |
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438 |
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439 /* RFC 2960 3.3.10 - Operation Error |
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440 * |
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441 * Cause Code: 16 bits (unsigned integer) |
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442 * |
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443 * Defines the type of error conditions being reported. |
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444 * Cause Code |
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445 * Value Cause Code |
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446 * --------- ---------------- |
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447 * 1 Invalid Stream Identifier |
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448 * 2 Missing Mandatory Parameter |
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449 * 3 Stale Cookie Error |
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450 * 4 Out of Resource |
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451 * 5 Unresolvable Address |
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452 * 6 Unrecognized Chunk Type |
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453 * 7 Invalid Mandatory Parameter |
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454 * 8 Unrecognized Parameters |
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455 * 9 No User Data |
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456 * 10 Cookie Received While Shutting Down |
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457 */ |
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458 typedef enum { |
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459 |
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460 SCTP_ERROR_NO_ERROR = __constant_htons(0x00), |
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461 SCTP_ERROR_INV_STRM = __constant_htons(0x01), |
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462 SCTP_ERROR_MISS_PARAM = __constant_htons(0x02), |
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463 SCTP_ERROR_STALE_COOKIE = __constant_htons(0x03), |
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464 SCTP_ERROR_NO_RESOURCE = __constant_htons(0x04), |
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465 SCTP_ERROR_DNS_FAILED = __constant_htons(0x05), |
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466 SCTP_ERROR_UNKNOWN_CHUNK = __constant_htons(0x06), |
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467 SCTP_ERROR_INV_PARAM = __constant_htons(0x07), |
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468 SCTP_ERROR_UNKNOWN_PARAM = __constant_htons(0x08), |
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469 SCTP_ERROR_NO_DATA = __constant_htons(0x09), |
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470 SCTP_ERROR_COOKIE_IN_SHUTDOWN = __constant_htons(0x0a), |
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471 |
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472 |
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473 /* SCTP Implementation Guide: |
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474 * 11 Restart of an association with new addresses |
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475 * 12 User Initiated Abort |
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476 * 13 Protocol Violation |
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477 */ |
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478 |
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479 SCTP_ERROR_RESTART = __constant_htons(0x0b), |
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480 SCTP_ERROR_USER_ABORT = __constant_htons(0x0c), |
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481 SCTP_ERROR_PROTO_VIOLATION = __constant_htons(0x0d), |
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482 |
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483 /* ADDIP Section 3.3 New Error Causes |
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484 * |
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485 * Four new Error Causes are added to the SCTP Operational Errors, |
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486 * primarily for use in the ASCONF-ACK chunk. |
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487 * |
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488 * Value Cause Code |
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489 * --------- ---------------- |
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490 * 0x0100 Request to Delete Last Remaining IP Address. |
|
491 * 0x0101 Operation Refused Due to Resource Shortage. |
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492 * 0x0102 Request to Delete Source IP Address. |
|
493 * 0x0103 Association Aborted due to illegal ASCONF-ACK |
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494 * 0x0104 Request refused - no authorization. |
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495 */ |
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496 SCTP_ERROR_DEL_LAST_IP = __constant_htons(0x0100), |
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497 SCTP_ERROR_RSRC_LOW = __constant_htons(0x0101), |
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498 SCTP_ERROR_DEL_SRC_IP = __constant_htons(0x0102), |
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499 SCTP_ERROR_ASCONF_ACK = __constant_htons(0x0103), |
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500 SCTP_ERROR_REQ_REFUSED = __constant_htons(0x0104), |
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501 |
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502 /* AUTH Section 4. New Error Cause |
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503 * |
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504 * This section defines a new error cause that will be sent if an AUTH |
|
505 * chunk is received with an unsupported HMAC identifier. |
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506 * illustrates the new error cause. |
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507 * |
|
508 * Cause Code Error Cause Name |
|
509 * -------------------------------------------------------------- |
|
510 * 0x0105 Unsupported HMAC Identifier |
|
511 */ |
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512 SCTP_ERROR_UNSUP_HMAC = __constant_htons(0x0105) |
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513 } sctp_error_t; |
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514 |
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515 |
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516 |
|
517 /* RFC 2960. Appendix A. Explicit Congestion Notification. |
|
518 * Explicit Congestion Notification Echo (ECNE) (12) |
|
519 */ |
|
520 typedef struct sctp_ecnehdr { |
|
521 __be32 lowest_tsn; |
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522 } sctp_ecnehdr_t; |
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523 |
|
524 typedef struct sctp_ecne_chunk { |
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525 sctp_chunkhdr_t chunk_hdr; |
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526 sctp_ecnehdr_t ence_hdr; |
|
527 } __attribute__((packed)) sctp_ecne_chunk_t; |
|
528 |
|
529 /* RFC 2960. Appendix A. Explicit Congestion Notification. |
|
530 * Congestion Window Reduced (CWR) (13) |
|
531 */ |
|
532 typedef struct sctp_cwrhdr { |
|
533 __be32 lowest_tsn; |
|
534 } sctp_cwrhdr_t; |
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535 |
|
536 typedef struct sctp_cwr_chunk { |
|
537 sctp_chunkhdr_t chunk_hdr; |
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538 sctp_cwrhdr_t cwr_hdr; |
|
539 } __attribute__((packed)) sctp_cwr_chunk_t; |
|
540 |
|
541 /* PR-SCTP |
|
542 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN) |
|
543 * |
|
544 * Forward Cumulative TSN chunk has the following format: |
|
545 * |
|
546 * 0 1 2 3 |
|
547 * 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 |
|
548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
|
549 * | Type = 192 | Flags = 0x00 | Length = Variable | |
|
550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
|
551 * | New Cumulative TSN | |
|
552 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
|
553 * | Stream-1 | Stream Sequence-1 | |
|
554 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
|
555 * \ / |
|
556 * / \ |
|
557 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
|
558 * | Stream-N | Stream Sequence-N | |
|
559 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
|
560 * |
|
561 * Chunk Flags: |
|
562 * |
|
563 * Set to all zeros on transmit and ignored on receipt. |
|
564 * |
|
565 * New Cumulative TSN: 32 bit u_int |
|
566 * |
|
567 * This indicates the new cumulative TSN to the data receiver. Upon |
|
568 * the reception of this value, the data receiver MUST consider |
|
569 * any missing TSNs earlier than or equal to this value as received |
|
570 * and stop reporting them as gaps in any subsequent SACKs. |
|
571 * |
|
572 * Stream-N: 16 bit u_int |
|
573 * |
|
574 * This field holds a stream number that was skipped by this |
|
575 * FWD-TSN. |
|
576 * |
|
577 * Stream Sequence-N: 16 bit u_int |
|
578 * This field holds the sequence number associated with the stream |
|
579 * that was skipped. The stream sequence field holds the largest stream |
|
580 * sequence number in this stream being skipped. The receiver of |
|
581 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields |
|
582 * to enable delivery of any stranded TSN's that remain on the stream |
|
583 * re-ordering queues. This field MUST NOT report TSN's corresponding |
|
584 * to DATA chunk that are marked as unordered. For ordered DATA |
|
585 * chunks this field MUST be filled in. |
|
586 */ |
|
587 struct sctp_fwdtsn_skip { |
|
588 __be16 stream; |
|
589 __be16 ssn; |
|
590 } __attribute__((packed)); |
|
591 |
|
592 struct sctp_fwdtsn_hdr { |
|
593 __be32 new_cum_tsn; |
|
594 struct sctp_fwdtsn_skip skip[0]; |
|
595 } __attribute((packed)); |
|
596 |
|
597 struct sctp_fwdtsn_chunk { |
|
598 struct sctp_chunkhdr chunk_hdr; |
|
599 struct sctp_fwdtsn_hdr fwdtsn_hdr; |
|
600 } __attribute((packed)); |
|
601 |
|
602 |
|
603 /* ADDIP |
|
604 * Section 3.1.1 Address Configuration Change Chunk (ASCONF) |
|
605 * |
|
606 * Serial Number: 32 bits (unsigned integer) |
|
607 * This value represents a Serial Number for the ASCONF Chunk. The |
|
608 * valid range of Serial Number is from 0 to 2^32-1. |
|
609 * Serial Numbers wrap back to 0 after reaching 2^32 -1. |
|
610 * |
|
611 * Address Parameter: 8 or 20 bytes (depending on type) |
|
612 * The address is an address of the sender of the ASCONF chunk, |
|
613 * the address MUST be considered part of the association by the |
|
614 * peer endpoint. This field may be used by the receiver of the |
|
615 * ASCONF to help in finding the association. This parameter MUST |
|
616 * be present in every ASCONF message i.e. it is a mandatory TLV |
|
617 * parameter. |
|
618 * |
|
619 * ASCONF Parameter: TLV format |
|
620 * Each Address configuration change is represented by a TLV |
|
621 * parameter as defined in Section 3.2. One or more requests may |
|
622 * be present in an ASCONF Chunk. |
|
623 * |
|
624 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK) |
|
625 * |
|
626 * Serial Number: 32 bits (unsigned integer) |
|
627 * This value represents the Serial Number for the received ASCONF |
|
628 * Chunk that is acknowledged by this chunk. This value is copied |
|
629 * from the received ASCONF Chunk. |
|
630 * |
|
631 * ASCONF Parameter Response: TLV format |
|
632 * The ASCONF Parameter Response is used in the ASCONF-ACK to |
|
633 * report status of ASCONF processing. |
|
634 */ |
|
635 typedef struct sctp_addip_param { |
|
636 sctp_paramhdr_t param_hdr; |
|
637 __be32 crr_id; |
|
638 } __attribute__((packed)) sctp_addip_param_t; |
|
639 |
|
640 typedef struct sctp_addiphdr { |
|
641 __be32 serial; |
|
642 __u8 params[0]; |
|
643 } __attribute__((packed)) sctp_addiphdr_t; |
|
644 |
|
645 typedef struct sctp_addip_chunk { |
|
646 sctp_chunkhdr_t chunk_hdr; |
|
647 sctp_addiphdr_t addip_hdr; |
|
648 } __attribute__((packed)) sctp_addip_chunk_t; |
|
649 |
|
650 /* AUTH |
|
651 * Section 4.1 Authentication Chunk (AUTH) |
|
652 * |
|
653 * This chunk is used to hold the result of the HMAC calculation. |
|
654 * |
|
655 * 0 1 2 3 |
|
656 * 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 |
|
657 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
|
658 * | Type = 0x0F | Flags=0 | Length | |
|
659 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
|
660 * | Shared Key Identifier | HMAC Identifier | |
|
661 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
|
662 * | | |
|
663 * \ HMAC / |
|
664 * / \ |
|
665 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
|
666 * |
|
667 * Type: 1 byte (unsigned integer) |
|
668 * This value MUST be set to 0x0F for all AUTH-chunks. |
|
669 * |
|
670 * Flags: 1 byte (unsigned integer) |
|
671 * Set to zero on transmit and ignored on receipt. |
|
672 * |
|
673 * Length: 2 bytes (unsigned integer) |
|
674 * This value holds the length of the HMAC in bytes plus 8. |
|
675 * |
|
676 * Shared Key Identifier: 2 bytes (unsigned integer) |
|
677 * This value describes which endpoint pair shared key is used. |
|
678 * |
|
679 * HMAC Identifier: 2 bytes (unsigned integer) |
|
680 * This value describes which message digest is being used. Table 2 |
|
681 * shows the currently defined values. |
|
682 * |
|
683 * The following Table 2 shows the currently defined values for HMAC |
|
684 * identifiers. |
|
685 * |
|
686 * +-----------------+--------------------------+ |
|
687 * | HMAC Identifier | Message Digest Algorithm | |
|
688 * +-----------------+--------------------------+ |
|
689 * | 0 | Reserved | |
|
690 * | 1 | SHA-1 defined in [8] | |
|
691 * | 2 | Reserved | |
|
692 * | 3 | SHA-256 defined in [8] | |
|
693 * +-----------------+--------------------------+ |
|
694 * |
|
695 * |
|
696 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC |
|
697 * calculation. |
|
698 */ |
|
699 typedef struct sctp_authhdr { |
|
700 __be16 shkey_id; |
|
701 __be16 hmac_id; |
|
702 __u8 hmac[0]; |
|
703 } __attribute__((packed)) sctp_authhdr_t; |
|
704 |
|
705 typedef struct sctp_auth_chunk { |
|
706 sctp_chunkhdr_t chunk_hdr; |
|
707 sctp_authhdr_t auth_hdr; |
|
708 } __attribute__((packed)) sctp_auth_chunk_t; |
|
709 |
|
710 #endif /* __LINUX_SCTP_H__ */ |