398 lines
12 KiB
C
398 lines
12 KiB
C
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/*
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* Copyright (c) 1998-2007 The TCPDUMP project
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code
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* distributions retain the above copyright notice and this paragraph
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* in its entirety, and (2) distributions including binary code include
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* the above copyright notice and this paragraph in its entirety in
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* the documentation or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
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* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
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* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*
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* Optimized Link State Protocl (OLSR) as per rfc3626
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*
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* Original code by Hannes Gredler <hannes@juniper.net>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h"
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#include "ip.h"
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/*
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* RFC 3626 common header
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*
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* 0 1 2 3
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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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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Packet Length | Packet Sequence Number |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Message Type | Vtime | Message Size |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Originator Address |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Time To Live | Hop Count | Message Sequence Number |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* : MESSAGE :
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Message Type | Vtime | Message Size |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Originator Address |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Time To Live | Hop Count | Message Sequence Number |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* : MESSAGE :
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* : :
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*/
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struct olsr_common {
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u_int8_t packet_len[2];
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u_int8_t packet_seq[2];
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};
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#define OLSR_HELLO_MSG 1 /* rfc3626 */
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#define OLSR_TC_MSG 2 /* rfc3626 */
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#define OLSR_MID_MSG 3 /* rfc3626 */
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#define OLSR_HNA_MSG 4 /* rfc3626 */
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#define OLSR_POWERINFO_MSG 128
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#define OLSR_NAMESERVICE_MSG 130
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#define OLSR_HELLO_LQ_MSG 201 /* LQ extensions olsr.org */
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#define OLSR_TC_LQ_MSG 202 /* LQ extensions olsr.org */
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static struct tok olsr_msg_values[] = {
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{ OLSR_HELLO_MSG, "Hello" },
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{ OLSR_TC_MSG, "TC" },
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{ OLSR_MID_MSG, "MID" },
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{ OLSR_HNA_MSG, "HNA" },
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{ OLSR_POWERINFO_MSG, "Powerinfo" },
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{ OLSR_NAMESERVICE_MSG, "Nameservice" },
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{ OLSR_HELLO_LQ_MSG, "Hello-LQ" },
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{ OLSR_TC_LQ_MSG, "TC-LQ" },
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{ 0, NULL}
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};
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struct olsr_msg {
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u_int8_t msg_type;
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u_int8_t vtime;
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u_int8_t msg_len[2];
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u_int8_t originator[4];
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u_int8_t ttl;
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u_int8_t hopcount;
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u_int8_t msg_seq[2];
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};
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struct olsr_hello {
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u_int8_t res[2];
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u_int8_t htime;
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u_int8_t will;
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};
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struct olsr_hello_link {
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u_int8_t link_code;
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u_int8_t res;
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u_int8_t len[2];
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};
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struct olsr_tc {
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u_int8_t ans_seq[2];
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u_int8_t res[2];
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};
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struct olsr_hna {
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u_int8_t network[4];
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u_int8_t mask[4];
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};
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#define OLSR_EXTRACT_LINK_TYPE(link_code) (link_code & 0x3)
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#define OLSR_EXTRACT_NEIGHBOR_TYPE(link_code) (link_code >> 2)
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static struct tok olsr_link_type_values[] = {
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{ 0, "Unspecified" },
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{ 1, "Asymmetric" },
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{ 2, "Symmetric" },
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{ 3, "Lost" },
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{ 0, NULL}
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};
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static struct tok olsr_neighbor_type_values[] = {
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{ 0, "Not-Neighbor" },
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{ 1, "Symmetric" },
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{ 2, "Symmetric-MPR" },
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{ 0, NULL}
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};
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struct olsr_lq_neighbor {
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u_int8_t neighbor[4];
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u_int8_t link_quality;
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u_int8_t neighbor_link_quality;
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u_int8_t res[2];
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};
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/*
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* macro to convert the 8-bit mantissa/exponent to a double float
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* taken from olsr.org.
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*/
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#define VTIME_SCALE_FACTOR 0.0625
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#define ME_TO_DOUBLE(me) \
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(double)(VTIME_SCALE_FACTOR*(1+(double)(me>>4)/16)*(double)(1<<(me&0x0F)))
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/*
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* print a neighbor list with LQ extensions.
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*/
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static void
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olsr_print_lq_neighbor (const u_char *msg_data, u_int hello_len)
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{
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struct olsr_lq_neighbor *lq_neighbor;
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while (hello_len >= sizeof(struct olsr_lq_neighbor)) {
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lq_neighbor = (struct olsr_lq_neighbor *)msg_data;
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printf("\n\t neighbor %s, link-quality %.2lf%%"
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", neighbor-link-quality %.2lf%%",
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ipaddr_string(lq_neighbor->neighbor),
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((double)lq_neighbor->link_quality/2.55),
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((double)lq_neighbor->neighbor_link_quality/2.55));
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msg_data += sizeof(struct olsr_lq_neighbor);
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hello_len -= sizeof(struct olsr_lq_neighbor);
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}
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}
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/*
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* print a neighbor list.
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*/
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static void
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olsr_print_neighbor (const u_char *msg_data, u_int hello_len)
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{
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int neighbor;
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printf("\n\t neighbor\n\t\t");
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neighbor = 1;
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while (hello_len >= sizeof(struct in_addr)) {
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/* print 4 neighbors per line */
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printf("%s%s", ipaddr_string(msg_data),
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neighbor % 4 == 0 ? "\n\t\t" : " ");
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msg_data += sizeof(struct in_addr);
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hello_len -= sizeof(struct in_addr);
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}
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}
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void
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olsr_print (const u_char *pptr, u_int length)
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{
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union {
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const struct olsr_common *common;
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const struct olsr_msg *msg;
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const struct olsr_hello *hello;
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const struct olsr_hello_link *hello_link;
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const struct olsr_lq_neighbor *lq_neighbor;
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const struct olsr_tc *tc;
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const struct olsr_hna *hna;
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} ptr;
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u_int msg_type, msg_len, msg_tlen, hello_len, prefix;
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u_int8_t link_type, neighbor_type;
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const u_char *tptr, *msg_data;
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tptr = pptr;
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if (length < sizeof(struct olsr_common)) {
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goto trunc;
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}
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if (!TTEST2(*tptr, sizeof(struct olsr_common))) {
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goto trunc;
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}
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ptr.common = (struct olsr_common *)tptr;
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length = MIN(length, EXTRACT_16BITS(ptr.common->packet_len));
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printf("OLSR, seq 0x%04x, length %u",
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EXTRACT_16BITS(ptr.common->packet_seq),
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length);
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tptr += sizeof(struct olsr_common);
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/*
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* In non-verbose mode, just print version.
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*/
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if (vflag < 1) {
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return;
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}
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while (tptr < (pptr+length)) {
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if (!TTEST2(*tptr, sizeof(struct olsr_msg)))
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goto trunc;
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ptr.msg = (struct olsr_msg *)tptr;
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msg_type = ptr.msg->msg_type;
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msg_len = EXTRACT_16BITS(ptr.msg->msg_len);
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/* infinite loop check */
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if (msg_type == 0 || msg_len == 0) {
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return;
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}
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printf("\n\t%s Message (%u), originator %s, ttl %u, hop %u"
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"\n\t vtime %.3lfs, msg-seq 0x%04x, length %u",
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tok2str(olsr_msg_values, "Unknown", msg_type),
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msg_type, ipaddr_string(ptr.msg->originator),
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ptr.msg->ttl,
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ptr.msg->hopcount,
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ME_TO_DOUBLE(ptr.msg->vtime),
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EXTRACT_16BITS(ptr.msg->msg_seq),
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msg_len);
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msg_tlen = msg_len - sizeof(struct olsr_msg);
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msg_data = tptr + sizeof(struct olsr_msg);
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switch (msg_type) {
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case OLSR_HELLO_MSG:
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case OLSR_HELLO_LQ_MSG:
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if (!TTEST2(*msg_data, sizeof(struct olsr_hello)))
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goto trunc;
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ptr.hello = (struct olsr_hello *)msg_data;
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printf("\n\t hello-time %.3lfs, MPR willingness %u",
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ME_TO_DOUBLE(ptr.hello->htime), ptr.hello->will);
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msg_data += sizeof(struct olsr_hello);
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msg_tlen -= sizeof(struct olsr_hello);
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while (msg_tlen >= sizeof(struct olsr_hello_link)) {
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/*
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* link-type.
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*/
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if (!TTEST2(*msg_data, sizeof(struct olsr_hello_link)))
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goto trunc;
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ptr.hello_link = (struct olsr_hello_link *)msg_data;
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hello_len = EXTRACT_16BITS(ptr.hello_link->len);
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link_type = OLSR_EXTRACT_LINK_TYPE(ptr.hello_link->link_code);
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neighbor_type = OLSR_EXTRACT_NEIGHBOR_TYPE(ptr.hello_link->link_code);
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printf("\n\t link-type %s, neighbor-type %s, len %u",
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tok2str(olsr_link_type_values, "Unknown", link_type),
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tok2str(olsr_neighbor_type_values, "Unknown", neighbor_type),
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hello_len);
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msg_data += sizeof(struct olsr_hello_link);
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msg_tlen -= sizeof(struct olsr_hello_link);
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hello_len -= sizeof(struct olsr_hello_link);
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if (msg_type == OLSR_HELLO_MSG) {
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olsr_print_neighbor(msg_data, hello_len);
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} else {
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olsr_print_lq_neighbor(msg_data, hello_len);
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}
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msg_data += hello_len;
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msg_tlen -= hello_len;
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}
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break;
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case OLSR_TC_MSG:
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case OLSR_TC_LQ_MSG:
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if (!TTEST2(*msg_data, sizeof(struct olsr_tc)))
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goto trunc;
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ptr.tc = (struct olsr_tc *)msg_data;
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printf("\n\t advertised neighbor seq 0x%04x",
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EXTRACT_16BITS(ptr.tc->ans_seq));
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msg_data += sizeof(struct olsr_tc);
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msg_tlen -= sizeof(struct olsr_tc);
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if (msg_type == OLSR_TC_MSG) {
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olsr_print_neighbor(msg_data, msg_tlen);
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} else {
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olsr_print_lq_neighbor(msg_data, msg_tlen);
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}
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break;
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case OLSR_MID_MSG:
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if (!TTEST2(*msg_data, sizeof(struct in_addr)))
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goto trunc;
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while (msg_tlen >= sizeof(struct in_addr)) {
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printf("\n\t interface address %s", ipaddr_string(msg_data));
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msg_data += sizeof(struct in_addr);
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msg_tlen -= sizeof(struct in_addr);
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}
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break;
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case OLSR_HNA_MSG:
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prefix = 1;
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printf("\n\t advertised networks\n\t ");
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while (msg_tlen >= sizeof(struct olsr_hna)) {
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if (!TTEST2(*msg_data, sizeof(struct olsr_hna)))
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goto trunc;
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ptr.hna = (struct olsr_hna *)msg_data;
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/* print 4 prefixes per line */
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printf("%s/%u%s",
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ipaddr_string(ptr.hna->network),
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mask2plen(EXTRACT_32BITS(ptr.hna->mask)),
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prefix % 4 == 0 ? "\n\t " : " ");
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|
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msg_data += sizeof(struct olsr_hna);
|
||
|
|
msg_tlen -= sizeof(struct olsr_hna);
|
||
|
|
prefix ++;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* FIXME those are the defined messages that lack a decoder
|
||
|
|
* you are welcome to contribute code ;-)
|
||
|
|
*/
|
||
|
|
|
||
|
|
case OLSR_POWERINFO_MSG:
|
||
|
|
case OLSR_NAMESERVICE_MSG:
|
||
|
|
default:
|
||
|
|
print_unknown_data(msg_data, "\n\t ", msg_tlen);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
tptr += msg_len;
|
||
|
|
}
|
||
|
|
|
||
|
|
return;
|
||
|
|
|
||
|
|
trunc:
|
||
|
|
printf("[|olsr]");
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Local Variables:
|
||
|
|
* c-style: whitesmith
|
||
|
|
* c-basic-offset: 4
|
||
|
|
* End:
|
||
|
|
*/
|