760 lines
18 KiB
C
760 lines
18 KiB
C
/*
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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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* Original code by Andy Heffernan (ahh@juniper.net)
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/print-pgm.c,v 1.1.2.5 2005/06/07 22:06:16 guy Exp $";
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#endif
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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 <stdlib.h>
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#include <string.h>
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#include "interface.h"
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#include "extract.h"
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#include "addrtoname.h"
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#include "ip.h"
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#ifdef INET6
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#include "ip6.h"
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#endif
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#include "ipproto.h"
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/*
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* PGM header (RFC 3208)
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*/
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struct pgm_header {
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u_int16_t pgm_sport;
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u_int16_t pgm_dport;
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u_int8_t pgm_type;
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u_int8_t pgm_options;
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u_int16_t pgm_sum;
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u_int8_t pgm_gsid[6];
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u_int16_t pgm_length;
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};
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struct pgm_spm {
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u_int32_t pgms_seq;
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u_int32_t pgms_trailseq;
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u_int32_t pgms_leadseq;
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u_int16_t pgms_nla_afi;
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u_int16_t pgms_reserved;
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/* ... u_int8_t pgms_nla[0]; */
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/* ... options */
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};
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struct pgm_nak {
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u_int32_t pgmn_seq;
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u_int16_t pgmn_source_afi;
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u_int16_t pgmn_reserved;
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/* ... u_int8_t pgmn_source[0]; */
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/* ... u_int16_t pgmn_group_afi */
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/* ... u_int16_t pgmn_reserved2; */
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/* ... u_int8_t pgmn_group[0]; */
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/* ... options */
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};
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struct pgm_poll {
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u_int32_t pgmp_seq;
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u_int16_t pgmp_round;
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u_int16_t pgmp_reserved;
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/* ... options */
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};
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struct pgm_polr {
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u_int32_t pgmp_seq;
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u_int16_t pgmp_round;
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u_int16_t pgmp_subtype;
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u_int16_t pgmp_nla_afi;
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u_int16_t pgmp_reserved;
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/* ... u_int8_t pgmp_nla[0]; */
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/* ... options */
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};
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struct pgm_data {
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u_int32_t pgmd_seq;
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u_int32_t pgmd_trailseq;
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/* ... options */
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};
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typedef enum _pgm_type {
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PGM_SPM = 0, /* source path message */
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PGM_POLL = 1, /* POLL Request */
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PGM_POLR = 2, /* POLL Response */
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PGM_ODATA = 4, /* original data */
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PGM_RDATA = 5, /* repair data */
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PGM_NAK = 8, /* NAK */
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PGM_NULLNAK = 9, /* Null NAK */
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PGM_NCF = 10, /* NAK Confirmation */
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PGM_ACK = 11, /* ACK for congestion control */
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PGM_SPMR = 12, /* SPM request */
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PGM_MAX = 255
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} pgm_type;
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#define PGM_OPT_BIT_PRESENT 0x01
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#define PGM_OPT_BIT_NETWORK 0x02
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#define PGM_OPT_BIT_VAR_PKTLEN 0x40
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#define PGM_OPT_BIT_PARITY 0x80
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#define PGM_OPT_LENGTH 0x00
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#define PGM_OPT_FRAGMENT 0x01
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#define PGM_OPT_NAK_LIST 0x02
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#define PGM_OPT_JOIN 0x03
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#define PGM_OPT_NAK_BO_IVL 0x04
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#define PGM_OPT_NAK_BO_RNG 0x05
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#define PGM_OPT_REDIRECT 0x07
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#define PGM_OPT_PARITY_PRM 0x08
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#define PGM_OPT_PARITY_GRP 0x09
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#define PGM_OPT_CURR_TGSIZE 0x0A
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#define PGM_OPT_NBR_UNREACH 0x0B
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#define PGM_OPT_PATH_NLA 0x0C
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#define PGM_OPT_SYN 0x0D
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#define PGM_OPT_FIN 0x0E
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#define PGM_OPT_RST 0x0F
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#define PGM_OPT_CR 0x10
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#define PGM_OPT_CRQST 0x11
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#define PGM_OPT_MASK 0x7f
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#define PGM_OPT_END 0x80 /* end of options marker */
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#define PGM_MIN_OPT_LEN 4
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#ifndef AFI_IP
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#define AFI_IP 1
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#define AFI_IP6 2
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#endif
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void
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pgm_print(register const u_char *bp, register u_int length,
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register const u_char *bp2)
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{
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register const struct pgm_header *pgm;
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register const struct ip *ip;
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register char ch;
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u_int16_t sport, dport;
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int addr_size;
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const void *nla;
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int nla_af;
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#ifdef INET6
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char nla_buf[INET6_ADDRSTRLEN];
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register const struct ip6_hdr *ip6;
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#else
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char nla_buf[INET_ADDRSTRLEN];
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#endif
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u_int8_t opt_type, opt_len, flags1, flags2;
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u_int32_t seq, opts_len, len, offset;
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pgm = (struct pgm_header *)bp;
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ip = (struct ip *)bp2;
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#ifdef INET6
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if (IP_V(ip) == 6)
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ip6 = (struct ip6_hdr *)bp2;
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else
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ip6 = NULL;
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#else /* INET6 */
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if (IP_V(ip) == 6) {
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(void)printf("Can't handle IPv6");
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return;
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}
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#endif /* INET6 */
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ch = '\0';
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if (!TTEST(pgm->pgm_dport)) {
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#ifdef INET6
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if (ip6) {
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(void)printf("%s > %s: [|pgm]",
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ip6addr_string(&ip6->ip6_src),
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ip6addr_string(&ip6->ip6_dst));
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return;
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} else
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#endif /* INET6 */
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{
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(void)printf("%s > %s: [|pgm]",
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ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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return;
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}
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}
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sport = EXTRACT_16BITS(&pgm->pgm_sport);
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dport = EXTRACT_16BITS(&pgm->pgm_dport);
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#ifdef INET6
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if (ip6) {
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if (ip6->ip6_nxt == IPPROTO_PGM) {
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(void)printf("%s.%s > %s.%s: ",
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ip6addr_string(&ip6->ip6_src),
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tcpport_string(sport),
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ip6addr_string(&ip6->ip6_dst),
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tcpport_string(dport));
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} else {
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(void)printf("%s > %s: ",
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tcpport_string(sport), tcpport_string(dport));
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}
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} else
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#endif /*INET6*/
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{
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if (ip->ip_p == IPPROTO_PGM) {
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(void)printf("%s.%s > %s.%s: ",
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ipaddr_string(&ip->ip_src),
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tcpport_string(sport),
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ipaddr_string(&ip->ip_dst),
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tcpport_string(dport));
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} else {
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(void)printf("%s > %s: ",
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tcpport_string(sport), tcpport_string(dport));
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}
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}
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TCHECK(*pgm);
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(void)printf("PGM, length %u", pgm->pgm_length);
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if (!vflag)
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return;
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if (length > pgm->pgm_length)
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length = pgm->pgm_length;
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(void)printf(" 0x%02x%02x%02x%02x%02x%02x ",
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pgm->pgm_gsid[0],
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pgm->pgm_gsid[1],
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pgm->pgm_gsid[2],
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pgm->pgm_gsid[3],
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pgm->pgm_gsid[4],
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pgm->pgm_gsid[5]);
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switch (pgm->pgm_type) {
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case PGM_SPM: {
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struct pgm_spm *spm;
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spm = (struct pgm_spm *)(pgm + 1);
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TCHECK(*spm);
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switch (EXTRACT_16BITS(&spm->pgms_nla_afi)) {
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case AFI_IP:
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addr_size = sizeof(struct in_addr);
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nla_af = AF_INET;
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break;
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#ifdef INET6
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case AFI_IP6:
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addr_size = sizeof(struct in6_addr);
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nla_af = AF_INET6;
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break;
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#endif
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default:
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goto trunc;
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break;
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}
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bp = (u_char *) (spm + 1);
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TCHECK2(*bp, addr_size);
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nla = bp;
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bp += addr_size;
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inet_ntop(nla_af, nla, nla_buf, sizeof(nla_buf));
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(void)printf("SPM seq %u trail %u lead %u nla %s",
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EXTRACT_32BITS(&spm->pgms_seq),
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EXTRACT_32BITS(&spm->pgms_trailseq),
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EXTRACT_32BITS(&spm->pgms_leadseq),
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nla_buf);
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break;
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}
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case PGM_POLL: {
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struct pgm_poll *poll;
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poll = (struct pgm_poll *)(pgm + 1);
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TCHECK(*poll);
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(void)printf("POLL seq %u round %u",
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EXTRACT_32BITS(&poll->pgmp_seq),
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EXTRACT_16BITS(&poll->pgmp_round));
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bp = (u_char *) (poll + 1);
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break;
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}
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case PGM_POLR: {
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struct pgm_polr *polr;
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u_int32_t ivl, rnd, mask;
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polr = (struct pgm_polr *)(pgm + 1);
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TCHECK(*polr);
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switch (EXTRACT_16BITS(&polr->pgmp_nla_afi)) {
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case AFI_IP:
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addr_size = sizeof(struct in_addr);
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nla_af = AF_INET;
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break;
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#ifdef INET6
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case AFI_IP6:
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addr_size = sizeof(struct in6_addr);
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nla_af = AF_INET6;
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break;
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#endif
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default:
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goto trunc;
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break;
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}
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bp = (u_char *) (polr + 1);
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TCHECK2(*bp, addr_size);
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nla = bp;
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bp += addr_size;
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inet_ntop(nla_af, nla, nla_buf, sizeof(nla_buf));
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TCHECK2(*bp, sizeof(u_int32_t));
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ivl = EXTRACT_32BITS(bp);
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bp += sizeof(u_int32_t);
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TCHECK2(*bp, sizeof(u_int32_t));
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rnd = EXTRACT_32BITS(bp);
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bp += sizeof(u_int32_t);
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TCHECK2(*bp, sizeof(u_int32_t));
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mask = EXTRACT_32BITS(bp);
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bp += sizeof(u_int32_t);
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(void)printf("POLR seq %u round %u nla %s ivl %u rnd 0x%08x "
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"mask 0x%08x", EXTRACT_32BITS(&polr->pgmp_seq),
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EXTRACT_16BITS(&polr->pgmp_round), nla_buf, ivl, rnd, mask);
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break;
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}
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case PGM_ODATA: {
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struct pgm_data *odata;
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odata = (struct pgm_data *)(pgm + 1);
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TCHECK(*odata);
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(void)printf("ODATA trail %u seq %u",
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EXTRACT_32BITS(&odata->pgmd_trailseq),
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EXTRACT_32BITS(&odata->pgmd_seq));
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bp = (u_char *) (odata + 1);
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break;
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}
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case PGM_RDATA: {
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struct pgm_data *rdata;
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rdata = (struct pgm_data *)(pgm + 1);
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TCHECK(*rdata);
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(void)printf("RDATA trail %u seq %u",
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EXTRACT_32BITS(&rdata->pgmd_trailseq),
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EXTRACT_32BITS(&rdata->pgmd_seq));
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bp = (u_char *) (rdata + 1);
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break;
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}
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case PGM_NAK:
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case PGM_NULLNAK:
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case PGM_NCF: {
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struct pgm_nak *nak;
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const void *source, *group;
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int source_af, group_af;
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#ifdef INET6
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char source_buf[INET6_ADDRSTRLEN], group_buf[INET6_ADDRSTRLEN];
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#else
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char source_buf[INET_ADDRSTRLEN], group_buf[INET_ADDRSTRLEN];
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#endif
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nak = (struct pgm_nak *)(pgm + 1);
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TCHECK(*nak);
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/*
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* Skip past the source, saving info along the way
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* and stopping if we don't have enough.
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*/
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switch (EXTRACT_16BITS(&nak->pgmn_source_afi)) {
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case AFI_IP:
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addr_size = sizeof(struct in_addr);
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source_af = AF_INET;
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break;
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#ifdef INET6
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case AFI_IP6:
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addr_size = sizeof(struct in6_addr);
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source_af = AF_INET6;
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break;
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#endif
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default:
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goto trunc;
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break;
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}
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bp = (u_char *) (nak + 1);
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TCHECK2(*bp, addr_size);
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source = bp;
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bp += addr_size;
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/*
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* Skip past the group, saving info along the way
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* and stopping if we don't have enough.
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*/
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switch (EXTRACT_16BITS(bp)) {
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case AFI_IP:
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addr_size = sizeof(struct in_addr);
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group_af = AF_INET;
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break;
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#ifdef INET6
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case AFI_IP6:
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addr_size = sizeof(struct in6_addr);
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group_af = AF_INET6;
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break;
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#endif
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default:
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goto trunc;
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break;
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}
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bp += (2 * sizeof(u_int16_t));
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TCHECK2(*bp, addr_size);
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group = bp;
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bp += addr_size;
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/*
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* Options decoding can go here.
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*/
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inet_ntop(source_af, source, source_buf, sizeof(source_buf));
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inet_ntop(group_af, group, group_buf, sizeof(group_buf));
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switch (pgm->pgm_type) {
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case PGM_NAK:
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(void)printf("NAK ");
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break;
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case PGM_NULLNAK:
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(void)printf("NNAK ");
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break;
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case PGM_NCF:
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(void)printf("NCF ");
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break;
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default:
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break;
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}
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(void)printf("(%s -> %s), seq %u",
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source_buf, group_buf, EXTRACT_32BITS(&nak->pgmn_seq));
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break;
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}
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case PGM_SPMR:
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(void)printf("SPMR");
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break;
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default:
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(void)printf("UNKNOWN type %0x02x", pgm->pgm_type);
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break;
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}
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if (pgm->pgm_options & PGM_OPT_BIT_PRESENT) {
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/*
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* make sure there's enough for the first option header
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*/
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if (!TTEST2(*bp, PGM_MIN_OPT_LEN)) {
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(void)printf("[|OPT]");
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return;
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}
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/*
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* That option header MUST be an OPT_LENGTH option
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* (see the first paragraph of section 9.1 in RFC 3208).
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*/
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opt_type = *bp++;
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if ((opt_type & PGM_OPT_MASK) != PGM_OPT_LENGTH) {
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(void)printf("[First option bad, should be PGM_OPT_LENGTH, is %u]", opt_type & PGM_OPT_MASK);
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return;
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}
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opt_len = *bp++;
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if (opt_len != 4) {
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(void)printf("[Bad OPT_LENGTH option, length %u != 4]", opt_len);
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return;
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}
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opts_len = EXTRACT_16BITS(bp);
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if (opts_len < 4) {
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(void)printf("[Bad total option length %u < 4]", opts_len);
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return;
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}
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bp += sizeof(u_int16_t);
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(void)printf(" OPTS LEN %d", opts_len);
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opts_len -= 4;
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while (opts_len) {
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if (opts_len < PGM_MIN_OPT_LEN) {
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(void)printf("[Total option length leaves no room for final option]");
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return;
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}
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opt_type = *bp++;
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opt_len = *bp++;
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if (opt_len < PGM_MIN_OPT_LEN) {
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(void)printf("[Bad option, length %u < %u]", opt_len,
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PGM_MIN_OPT_LEN);
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break;
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}
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if (opts_len < opt_len) {
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(void)printf("[Total option length leaves no room for final option]");
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return;
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}
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if (!TTEST2(*bp, opt_len - 2)) {
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(void)printf(" [|OPT]");
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return;
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}
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switch (opt_type & PGM_OPT_MASK) {
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case PGM_OPT_LENGTH:
|
|
if (opt_len != 4) {
|
|
(void)printf("[Bad OPT_LENGTH option, length %u != 4]", opt_len);
|
|
return;
|
|
}
|
|
(void)printf(" OPTS LEN (extra?) %d", EXTRACT_16BITS(bp));
|
|
bp += sizeof(u_int16_t);
|
|
opts_len -= 4;
|
|
break;
|
|
|
|
case PGM_OPT_FRAGMENT:
|
|
if (opt_len != 16) {
|
|
(void)printf("[Bad OPT_FRAGMENT option, length %u != 16]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
seq = EXTRACT_32BITS(bp);
|
|
bp += sizeof(u_int32_t);
|
|
offset = EXTRACT_32BITS(bp);
|
|
bp += sizeof(u_int32_t);
|
|
len = EXTRACT_32BITS(bp);
|
|
bp += sizeof(u_int32_t);
|
|
(void)printf(" FRAG seq %u off %u len %u", seq, offset, len);
|
|
opts_len -= 16;
|
|
break;
|
|
|
|
case PGM_OPT_NAK_LIST:
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
opt_len -= sizeof(u_int32_t); /* option header */
|
|
(void)printf(" NAK LIST");
|
|
while (opt_len) {
|
|
if (opt_len < sizeof(u_int32_t)) {
|
|
(void)printf("[Option length not a multiple of 4]");
|
|
return;
|
|
}
|
|
TCHECK2(*bp, sizeof(u_int32_t));
|
|
(void)printf(" %u", EXTRACT_32BITS(bp));
|
|
bp += sizeof(u_int32_t);
|
|
opt_len -= sizeof(u_int32_t);
|
|
opts_len -= sizeof(u_int32_t);
|
|
}
|
|
break;
|
|
|
|
case PGM_OPT_JOIN:
|
|
if (opt_len != 8) {
|
|
(void)printf("[Bad OPT_JOIN option, length %u != 8]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
seq = EXTRACT_32BITS(bp);
|
|
bp += sizeof(u_int32_t);
|
|
(void)printf(" JOIN %u", seq);
|
|
opts_len -= 8;
|
|
break;
|
|
|
|
case PGM_OPT_NAK_BO_IVL:
|
|
if (opt_len != 12) {
|
|
(void)printf("[Bad OPT_NAK_BO_IVL option, length %u != 12]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
offset = EXTRACT_32BITS(bp);
|
|
bp += sizeof(u_int32_t);
|
|
seq = EXTRACT_32BITS(bp);
|
|
bp += sizeof(u_int32_t);
|
|
(void)printf(" BACKOFF ivl %u ivlseq %u", offset, seq);
|
|
opts_len -= 12;
|
|
break;
|
|
|
|
case PGM_OPT_NAK_BO_RNG:
|
|
if (opt_len != 12) {
|
|
(void)printf("[Bad OPT_NAK_BO_RNG option, length %u != 12]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
offset = EXTRACT_32BITS(bp);
|
|
bp += sizeof(u_int32_t);
|
|
seq = EXTRACT_32BITS(bp);
|
|
bp += sizeof(u_int32_t);
|
|
(void)printf(" BACKOFF max %u min %u", offset, seq);
|
|
opts_len -= 12;
|
|
break;
|
|
|
|
case PGM_OPT_REDIRECT:
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
switch (EXTRACT_16BITS(bp)) {
|
|
case AFI_IP:
|
|
addr_size = sizeof(struct in_addr);
|
|
nla_af = AF_INET;
|
|
break;
|
|
#ifdef INET6
|
|
case AFI_IP6:
|
|
addr_size = sizeof(struct in6_addr);
|
|
nla_af = AF_INET6;
|
|
break;
|
|
#endif
|
|
default:
|
|
goto trunc;
|
|
break;
|
|
}
|
|
bp += (2 * sizeof(u_int16_t));
|
|
if (opt_len != 4 + addr_size) {
|
|
(void)printf("[Bad OPT_REDIRECT option, length %u != 4 + address size]", opt_len);
|
|
return;
|
|
}
|
|
TCHECK2(*bp, addr_size);
|
|
nla = bp;
|
|
bp += addr_size;
|
|
|
|
inet_ntop(nla_af, nla, nla_buf, sizeof(nla_buf));
|
|
(void)printf(" REDIRECT %s", (char *)nla);
|
|
opts_len -= 4 + addr_size;
|
|
break;
|
|
|
|
case PGM_OPT_PARITY_PRM:
|
|
if (opt_len != 8) {
|
|
(void)printf("[Bad OPT_PARITY_PRM option, length %u != 8]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
len = EXTRACT_32BITS(bp);
|
|
bp += sizeof(u_int32_t);
|
|
(void)printf(" PARITY MAXTGS %u", len);
|
|
opts_len -= 8;
|
|
break;
|
|
|
|
case PGM_OPT_PARITY_GRP:
|
|
if (opt_len != 8) {
|
|
(void)printf("[Bad OPT_PARITY_GRP option, length %u != 8]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
seq = EXTRACT_32BITS(bp);
|
|
bp += sizeof(u_int32_t);
|
|
(void)printf(" PARITY GROUP %u", seq);
|
|
opts_len -= 8;
|
|
break;
|
|
|
|
case PGM_OPT_CURR_TGSIZE:
|
|
if (opt_len != 8) {
|
|
(void)printf("[Bad OPT_CURR_TGSIZE option, length %u != 8]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
len = EXTRACT_32BITS(bp);
|
|
bp += sizeof(u_int32_t);
|
|
(void)printf(" PARITY ATGS %u", len);
|
|
opts_len -= 8;
|
|
break;
|
|
|
|
case PGM_OPT_NBR_UNREACH:
|
|
if (opt_len != 4) {
|
|
(void)printf("[Bad OPT_NBR_UNREACH option, length %u != 4]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
(void)printf(" NBR_UNREACH");
|
|
opts_len -= 4;
|
|
break;
|
|
|
|
case PGM_OPT_PATH_NLA:
|
|
(void)printf(" PATH_NLA [%d]", opt_len);
|
|
bp += opt_len;
|
|
opts_len -= opt_len;
|
|
break;
|
|
|
|
case PGM_OPT_SYN:
|
|
if (opt_len != 4) {
|
|
(void)printf("[Bad OPT_SYN option, length %u != 4]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
(void)printf(" SYN");
|
|
opts_len -= 4;
|
|
break;
|
|
|
|
case PGM_OPT_FIN:
|
|
if (opt_len != 4) {
|
|
(void)printf("[Bad OPT_FIN option, length %u != 4]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
(void)printf(" FIN");
|
|
opts_len -= 4;
|
|
break;
|
|
|
|
case PGM_OPT_RST:
|
|
if (opt_len != 4) {
|
|
(void)printf("[Bad OPT_RST option, length %u != 4]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
(void)printf(" RST");
|
|
opts_len -= 4;
|
|
break;
|
|
|
|
case PGM_OPT_CR:
|
|
(void)printf(" CR");
|
|
bp += opt_len;
|
|
opts_len -= opt_len;
|
|
break;
|
|
|
|
case PGM_OPT_CRQST:
|
|
if (opt_len != 4) {
|
|
(void)printf("[Bad OPT_CRQST option, length %u != 4]", opt_len);
|
|
return;
|
|
}
|
|
flags1 = *bp++;
|
|
flags2 = *bp++;
|
|
(void)printf(" CRQST");
|
|
opts_len -= 4;
|
|
break;
|
|
|
|
default:
|
|
(void)printf(" OPT_%02X [%d] ", opt_type, opt_len);
|
|
bp += opt_len;
|
|
opts_len -= opt_len;
|
|
break;
|
|
}
|
|
|
|
if (opt_type & PGM_OPT_END)
|
|
break;
|
|
}
|
|
}
|
|
|
|
(void)printf(" [%u]", EXTRACT_16BITS(&pgm->pgm_length));
|
|
|
|
return;
|
|
|
|
trunc:
|
|
fputs("[|pgm]", stdout);
|
|
if (ch != '\0')
|
|
putchar('>');
|
|
}
|