Make traceroute decode all the ICMP unreachable messages defined

in http://www.iana.org/assignments/icmp-parameters. Thankfully
IANA's list aggrees with <netinet/ip_icmp.h>.

I've tried to do this in a way which is mostly consistent with
tcptraceroute and Debian's version of traceroute. However, sometimes
a letter is used twice by these versions, so I've gone with:

                                LBL     tcptr   Debian          (chosen)
ICMP_UNREACH_NET                !N      !N      !N              !N
ICMP_UNREACH_HOST               !H      !H      !H              !H
ICMP_UNREACH_PROTOCOL           !P      !P      !P              !P
ICMP_UNREACH_PORT               !       !p      !               !
ICMP_UNREACH_NEEDFRAG           !F-%d   !F      !F-<%d>         !F-<%d>
ICMP_UNREACH_SRCFAIL            !S      !S      !S              !S
ICMP_UNREACH_NET_UNKNOWN        !<%d>   !U      !<%d>           !U
ICMP_UNREACH_HOST_UNKNOWN       !<%d>   !U      !<%d>           !W
ICMP_UNREACH_ISOLATED           !<%d>   !I      !I              !I
ICMP_UNREACH_NET_PROHIB         !<%d>   !A      !A              !A
ICMP_UNREACH_HOST_PROHIB        !<%d>   !C      !C              !Z
ICMP_UNREACH_TOSNET             !<%d>   !T      !T              !Q
ICMP_UNREACH_TOSHOST            !<%d>   !T      !T              !T
ICMP_UNREACH_FILTER_PROHIB      !X      !A      !A              !X
ICMP_UNREACH_HOST_PRECEDENCE    !V      !<%d>   !V              !V
ICMP_UNREACH_PRECEDENCE_CUTOFF  !C      !<%d>   !C              !C

Graham Wilson is planning to use the same codes in Debian's version.

MFC after:	3 weeks

2 files changed, 49 insertions, 0 deletions

diff --git a/contrib/traceroute/traceroute.8 b/contrib/traceroute/traceroute.8
index 3920d2a..710ecde 100644
--- a/contrib/traceroute/traceroute.8
+++ b/contrib/traceroute/traceroute.8
@@ -372,6 +372,20 @@ or
 (source route failed),
 .B !F\-<pmtu>
 (fragmentation needed \- the RFC1191 Path MTU Discovery value is displayed),
+.B !U
+or
+.B !W
+(destination network/host unknown),
+.B !I
+(source host is isolated),
+.B !A
+(communication with destination network administratively prohibited),
+.B !Z
+(communication with destination host administratively prohibited),
+.B !Q
+(for this ToS the destination network is unreachable),
+.B !T
+(for this ToS the destination host is unreachable),
 .B !X
 (communication administratively prohibited),
 .B !V
diff --git a/contrib/traceroute/traceroute.c b/contrib/traceroute/traceroute.c
index e6182f4..fd4165a 100644
--- a/contrib/traceroute/traceroute.c
+++ b/contrib/traceroute/traceroute.c
@@ -1017,6 +1017,41 @@ main(int argc, char **argv)
 					Printf(" !S");
 					break;
 
+				case ICMP_UNREACH_NET_UNKNOWN:
+					++unreachable;
+					Printf(" !U");
+					break;
+
+				case ICMP_UNREACH_HOST_UNKNOWN:
+					++unreachable;
+					Printf(" !W");
+					break;
+
+				case ICMP_UNREACH_ISOLATED:
+					++unreachable;
+					Printf(" !I");
+					break;
+
+				case ICMP_UNREACH_NET_PROHIB:
+					++unreachable;
+					Printf(" !A");
+					break;
+
+				case ICMP_UNREACH_HOST_PROHIB:
+					++unreachable;
+					Printf(" !Z");
+					break;
+
+				case ICMP_UNREACH_TOSNET:
+					++unreachable;
+					Printf(" !Q");
+					break;
+
+				case ICMP_UNREACH_TOSHOST:
+					++unreachable;
+					Printf(" !T");
+					break;
+
 				case ICMP_UNREACH_FILTER_PROHIB:
 					++unreachable;
 					Printf(" !X");