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Show MPLS ICMP extensions. Only available if -M is passed.

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Example:
	RC02-02 (195.245.142.66)  45.707 ms  20.418 ms  34.042 ms [MPLS: label: 515, exp: 0x0, ttl: 1]
	gr1-p340.attga.ip.att.net (12.123.20.190)  241.878 ms  251.945 ms [MPLS: label: 32133, exp: 0x0, ttl: 1]


Based on PR 22523: By Jesper Skriver (updated by ww@parc.styx.org and Mihai
CHELARU).

Things not in the PR that I changed/added:
       * changed exp and label to lower case
       * added ttl (probably not worth it but who knows..)
       * KNF/style/indent
       * C99 uintXX_t
This commit is contained in:
rpaulo 2006-02-17 21:31:18 +00:00
parent 951a531e19
commit 39c9cdcdbf
2 changed files with 181 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
usr.sbin/traceroute/traceroute.8
View File

@ -1,4 +1,4 @@
.\" $NetBSD: traceroute.8,v 1.27 2005/11/09 23:43:59 wiz Exp $
.\" $NetBSD: traceroute.8,v 1.28 2006/02/17 21:31:18 rpaulo Exp $
.\"
.\" Copyright (c) 1989, 1995, 1996, 1997
.\" The Regents of the University of California. All rights reserved.
@ -17,7 +17,7 @@
.\"
.\" Header: traceroute.8,v 1.11 97/04/22 13:45:13 leres Exp
.\"
.TH TRACEROUTE 8 "6 November 2005"
.TH TRACEROUTE 8 "17 February 2006"
.UC 6
.SH NAME
traceroute \- print the route packets take to network host
@ -25,7 +25,7 @@ traceroute \- print the route packets take to network host
.na
.B traceroute
[
.B \-aDFPIdlnrvx
.B \-aDFPIdlMnrvx
] [
.B \-f
.I first_ttl
@ -131,6 +131,9 @@ packets. The default value is taken from the
.I net.inet.ip.ttl
sysctl(3) variable.
.TP
.B \-M
If found, show the MPLS Label and the Experimental (EXP) bit for the hop.
.TP
.B \-n
Print hop addresses numerically rather than symbolically and numerically
(saves a nameserver address-to-name lookup for each gateway found on the

179
usr.sbin/traceroute/traceroute.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: traceroute.c,v 1.61 2004/04/22 01:41:22 itojun Exp $ */
/* $NetBSD: traceroute.c,v 1.62 2006/02/17 21:31:18 rpaulo Exp $ */
/*
* Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997
@ -29,7 +29,7 @@ static const char rcsid[] =
#else
__COPYRIGHT("@(#) Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997\n\
The Regents of the University of California. All rights reserved.\n");
__RCSID("$NetBSD: traceroute.c,v 1.61 2004/04/22 01:41:22 itojun Exp $");
__RCSID("$NetBSD: traceroute.c,v 1.62 2006/02/17 21:31:18 rpaulo Exp $");
#endif
#endif
@ -270,6 +270,54 @@ struct outdata {
struct timeval tv; /* time packet left */
};
/*
* Support for ICMP extensions
*
* http://www.ietf.org/proceedings/01aug/I-D/draft-ietf-mpls-icmp-02.txt
*/
#define ICMP_EXT_OFFSET 8 /* ICMP type, code, checksum, unused */ + \
128 /* original datagram */
#define ICMP_EXT_VERSION 2
/*
* ICMP extensions, common header
*/
struct icmp_ext_cmn_hdr {
#if BYTE_ORDER == BIG_ENDIAN
unsigned char version:4;
unsigned char reserved1:4;
#else
unsigned char reserved1:4;
unsigned char version:4;
#endif
unsigned char reserved2;
unsigned short checksum;
};
/*
* ICMP extensions, object header
*/
struct icmp_ext_obj_hdr {
u_short length;
u_char class_num;
#define MPLS_STACK_ENTRY_CLASS 1
u_char c_type;
#define MPLS_STACK_ENTRY_C_TYPE 1
};
struct mpls_header {
#if BYTE_ORDER == BIG_ENDIAN
uint32_t label:20;
unsigned char exp:3;
unsigned char s:1;
unsigned char ttl:8;
#else
unsigned char ttl:8;
unsigned char s:1;
unsigned char exp:3;
uint32_t label:20;
#endif
};
u_char packet[512]; /* last inbound (icmp) packet */
struct ip *outip; /* last output (udp) packet */
@ -308,6 +356,7 @@ int verbose;
int waittime = 5; /* time to wait for response (in seconds) */
int nflag; /* print addresses numerically */
int dump;
int Mflag; /* show MPLS labels if any */
int as_path; /* print as numbers for each hop */
char *as_server = NULL;
void *asn;
@ -369,6 +418,7 @@ int str2val(const char *, const char *, int, int);
void tvsub(struct timeval *, struct timeval *);
__dead void usage(void);
int wait_for_reply(int, struct sockaddr_in *, struct timeval *);
void decode_extensions(unsigned char *buf, int ip_len);
void frag_err(void);
int find_local_ip(struct sockaddr_in *, struct sockaddr_in *);
#ifdef IPSEC
@ -407,7 +457,7 @@ main(int argc, char **argv)
prog = argv[0];
opterr = 0;
while ((op = getopt(argc, argv, "aA:dDFPInlrvxf:g:i:m:p:q:s:t:w:")) != -1)
while ((op = getopt(argc, argv, "aA:dDFPIMnlrvxf:g:i:m:p:q:s:t:w:")) != -1)
switch (op) {
case 'a':
@ -462,6 +512,10 @@ main(int argc, char **argv)
max_ttl = str2val(optarg, "max ttl", 1, 255);
break;
case 'M':
Mflag = 1;
break;
case 'n':
++nflag;
break;
@ -1001,6 +1055,8 @@ again:
}
if (cc == 0)
Printf(" *");
else if (cc && probe == nprobes - 1 && Mflag)
decode_extensions(packet, cc);
(void)fflush(stdout);
}
putchar('\n');
@ -1051,6 +1107,121 @@ wait_for_reply(int sock, struct sockaddr_in *fromp, struct timeval *tp)
return(cc);
}
void
decode_extensions(unsigned char *buf, int ip_len)
{
struct icmp_ext_cmn_hdr *cmn_hdr;
struct icmp_ext_obj_hdr *obj_hdr;
union {
struct mpls_header mpls;
uint32_t mpls_h;
} mpls;
int datalen, obj_len;
struct ip *ip;
ip = (struct ip *)buf;
if (ip_len <= sizeof(struct ip) + ICMP_EXT_OFFSET) {
/*
* No support for ICMP extensions on this host
*/
return;
}
/*
* Move forward to the start of the ICMP extensions, if present
*/
buf += (ip->ip_hl << 2) + ICMP_EXT_OFFSET;
cmn_hdr = (struct icmp_ext_cmn_hdr *)buf;
if (cmn_hdr->version != ICMP_EXT_VERSION) {
/*
* Unknown version
*/
return;
}
datalen = ip_len - ((u_char *)cmn_hdr - (u_char *)ip);
/*
* Check the checksum, cmn_hdr->checksum == 0 means no checksum'ing
* done by sender.
*
* If the checksum is ok, we'll get 0, as the checksum is calculated
* with the checksum field being 0'd.
*/
if (ntohs(cmn_hdr->checksum) &&
in_cksum((u_short *)cmn_hdr, datalen)) {
return;
}
buf += sizeof(*cmn_hdr);
datalen -= sizeof(*cmn_hdr);
while (datalen > 0) {
obj_hdr = (struct icmp_ext_obj_hdr *)buf;
obj_len = ntohs(obj_hdr->length);
/*
* Sanity check the length field
*/
if (obj_len > datalen) {
return;
}
datalen -= obj_len;
/*
* Move past the object header
*/
buf += sizeof(struct icmp_ext_obj_hdr);
obj_len -= sizeof(struct icmp_ext_obj_hdr);
switch (obj_hdr->class_num) {
case MPLS_STACK_ENTRY_CLASS:
switch (obj_hdr->c_type) {
case MPLS_STACK_ENTRY_C_TYPE:
while (obj_len >= sizeof(uint32_t)) {
mpls.mpls_h = ntohl(*(uint32_t *)buf);
buf += sizeof(uint32_t);
obj_len -= sizeof(uint32_t);
printf(" [MPLS: label: %d, exp: 0x%x,"
" ttl: %d]", mpls.mpls.label,
mpls.mpls.exp, mpls.mpls.ttl);
}
if (obj_len > 0) {
/*
* Something went wrong, and we're at
* a unknown offset into the packet,
* ditch the rest of it.
*/
return;
}
break;
default:
/*
* Unknown object, skip past it
*/
buf += ntohs(obj_hdr->length) -
sizeof(struct icmp_ext_obj_hdr);
break;
}
break;
default:
/*
* Unknown object, skip past it
*/
buf += ntohs(obj_hdr->length) -
sizeof(struct icmp_ext_obj_hdr);
break;
}
}
}
void
dump_packet()
{
@ -1602,7 +1773,7 @@ usage(void)
extern char version[];
Fprintf(stderr, "Version %s\n", version);
Fprintf(stderr, "usage: %s [-adDFPIlnrvx] [-g gateway] [-i iface] \
Fprintf(stderr, "usage: %s [-adDFPIlMnrvx] [-g gateway] [-i iface] \
[-f first_ttl]\n\t[-m max_ttl] [-p port] [-q nqueries] [-s src_addr] [-t tos]\n\t\
[-w waittime] [-A as_server] host [packetlen]\n",
prog);