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Annotation of embedaddon/mtr/packet/protocols.h, revision 1.1.1.2

1.1       misho       1: /*
                      2:     mtr  --  a network diagnostic tool
                      3:     Copyright (C) 2016  Matt Kimball
                      4: 
                      5:     This program is free software; you can redistribute it and/or modify
                      6:     it under the terms of the GNU General Public License version 2 as
                      7:     published by the Free Software Foundation.
                      8: 
                      9:     This program is distributed in the hope that it will be useful,
                     10:     but WITHOUT ANY WARRANTY; without even the implied warranty of
                     11:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     12:     GNU General Public License for more details.
                     13: 
1.1.1.2 ! misho      14:     You should have received a copy of the GNU General Public License along
        !            15:     with this program; if not, write to the Free Software Foundation, Inc.,
        !            16:     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
1.1       misho      17: */
                     18: 
                     19: #ifndef PROTOCOLS_H
                     20: #define PROTOCOLS_H
                     21: 
                     22: /*  ICMPv4 type codes  */
                     23: #define ICMP_ECHOREPLY 0
                     24: #define ICMP_DEST_UNREACH 3
                     25: #define ICMP_ECHO 8
                     26: #define ICMP_TIME_EXCEEDED 11
                     27: 
                     28: /*  ICMP_DEST_UNREACH codes */
                     29: #define ICMP_PORT_UNREACH 3
                     30: 
                     31: /*  ICMPv6 type codes  */
                     32: #define ICMP6_DEST_UNREACH 1
                     33: #define ICMP6_TIME_EXCEEDED 3
                     34: #define ICMP6_ECHO 128
                     35: #define ICMP6_ECHOREPLY 129
                     36: 
                     37: /*  ICMP6_DEST_UNREACH codes */
                     38: #define ICMP6_PORT_UNREACH 4
                     39: 
                     40: /*
                     41:     The minimum size of the ICMP "original datagram" when
                     42:     using ICMP extensions
                     43: */
                     44: #define ICMP_ORIGINAL_DATAGRAM_MIN_SIZE 128
                     45: 
                     46: /*  The classnum and type of MPLS labels in an ICMP extension object  */
                     47: #define ICMP_EXT_MPLS_CLASSNUM 1
                     48: #define ICMP_EXT_MPLS_CTYPE 1
                     49: 
                     50: #define HTTP_PORT 80
                     51: 
                     52: /*  We can't rely on header files to provide this information, because
                     53:     the fields have different names between, for instance, Linux and 
                     54:     Solaris  */
                     55: struct ICMPHeader {
                     56:     uint8_t type;
                     57:     uint8_t code;
                     58:     uint16_t checksum;
                     59:     uint16_t id;
                     60:     uint16_t sequence;
                     61: };
                     62: 
                     63: /*  ICMP extension header, which might contain MPLS labels  */
                     64: /*  See RFC 4884  */
                     65: struct ICMPExtensionHeader {
                     66:     uint8_t version;
                     67:     uint8_t reserved;
                     68:     uint16_t checksum;
                     69: };
                     70: 
                     71: /*  An object in an extended ICMP object  */
                     72: struct ICMPExtensionObject {
                     73:     uint16_t len;
                     74:     uint8_t classnum;
                     75:     uint8_t ctype;
                     76: };
                     77: 
                     78: /*  An MPLS label included in an ICMP extension  */
                     79: /*  See RFC 4950  */
                     80: struct ICMPExtMPLSLabel {
1.1.1.2 ! misho      81:     uint8_t label[3];           // Low 4 bits are Traffic Class Use, Stack
1.1       misho      82:     uint8_t ttl;
                     83: };
                     84: 
                     85: /* Structure of an UDP header.  */
                     86: struct UDPHeader {
                     87:     uint16_t srcport;
                     88:     uint16_t dstport;
                     89:     uint16_t length;
                     90:     uint16_t checksum;
                     91: };
                     92: 
                     93: /* Structure of an TCP header, as far as we need it.  */
                     94: struct TCPHeader {
                     95:     uint16_t srcport;
                     96:     uint16_t dstport;
                     97:     uint32_t seq;
                     98: };
                     99: 
                    100: /* Structure of an SCTP header */
                    101: struct SCTPHeader {
                    102:     uint16_t srcport;
                    103:     uint16_t dstport;
                    104:     uint32_t veri_tag;
                    105: };
                    106: 
                    107: /* Structure of an IPv4 UDP pseudoheader.  */
                    108: struct UDPPseudoHeader {
                    109:     uint32_t saddr;
                    110:     uint32_t daddr;
                    111:     uint8_t zero;
                    112:     uint8_t protocol;
                    113:     uint16_t len;
                    114: };
                    115: 
                    116: /*  Structure of an IP header.  */
                    117: struct IPHeader {
                    118:     uint8_t version;
                    119:     uint8_t tos;
                    120:     uint16_t len;
                    121:     uint16_t id;
                    122:     uint16_t frag;
                    123:     uint8_t ttl;
                    124:     uint8_t protocol;
                    125:     uint16_t check;
                    126:     uint32_t saddr;
                    127:     uint32_t daddr;
                    128: };
                    129: 
                    130: /*  IP version 6 header  */
                    131: struct IP6Header {
                    132:     uint8_t version;
                    133:     uint8_t flow[3];
                    134:     uint16_t len;
                    135:     uint8_t protocol;
                    136:     uint8_t ttl;
                    137:     uint8_t saddr[16];
                    138:     uint8_t daddr[16];
                    139: };
                    140: 
                    141: /*  The pseudo-header used for checksum computation for ICMPv6 and UDPv6  */
                    142: struct IP6PseudoHeader {
                    143:     uint8_t saddr[16];
                    144:     uint8_t daddr[16];
                    145:     uint32_t len;
                    146:     uint8_t zero[3];
                    147:     uint8_t protocol;
                    148: };
                    149: 
                    150: #endif