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The SRv6 network programming defines a new IP protocol number [1].
The new protocol number is used in the Next Header field of an IPv6 header
or any extension header indicates that the payload is an Ethernet.
IANA has assigned 143 as the protocol number of ethernet [2].
The SRv6 packet has the following format:
IPv6 HDR + SRH + Ethernet HDR + IPv4/IPv6 packet
This patch allows TCPDUMP to dissect such SRv6 packets.
[1] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-16#section-9.1
[2] https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml
Signed-off-by: Ahmed Abdelsalam <ahabdels@gmail.com>
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This can prevent bizarre failures if, for example, you've done a
configuration in the top-level source directory, leaving behind one
config.h file, and then do an out-of-tree build in another directory,
with different configuration options. This way, we always pick up the
same config.h, in the build directory.
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This catches direct references, so we can change them to use EXTRACT_U_1
or EXTRACT_S_1.
Also, change some structures to use the nd_ types that weren't already
using them.
Then make the appropriate EXTRACT_{U,S}_1() changes.
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On Linux getprotobynumber() returns different results for the same
argument depending on the contents of /etc/protocols at runtime
(expectedly but gets in the way of reproducible test cases). On FreeBSD
it returns results that are irrelevant of the contents of /etc/protocols
at runtime (unexpectedly). Other implementations exist and may expose
interesting properties too. And if the host uses LDAP instead of
/etc/protocols for name services, a call to that function may cause LDAP
handle the request. All of the above is not right for the specific task
of network protocols decoding, which needs to be fast and deterministic.
As the protocol number space is just 8-bit, add a 256-element array of
strings/NULLs for the translation and a wrapper function around it for
index range enforcement. Change the code to use the new function instead
of getprotobynumber().
Fix a typo while at it.
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In ipproto_values[] IPPROTO_CARP never matched because of IPPROTO_VRRP,
which matched earlier. Remove the array element and the macro and leave
some comments instead.
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Moreover:
Remove netdissect.h include in interface.h
Move thiszone declaration in netdissect.h
Update a comment
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Get the full log via: git log --follow netdissect-stdinc.h
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The purpose of this macro was to enable the file-by-file switch to NDO,
after which only tcpdump.c had a use of it and the definitions guarded
by it. Update tcpdump.c not to require them any more and dismiss the
unused definitions.
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The only one it found was that routines in sigsecret.c needed to refer
to ndo->ndo_sigsecret, not just sigsecret.
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Remove lots of $Header's and a few $Id's that all belong to the former
CVS repository of tcpdump itself. These keywords have been frozen since
the migration to git in late 2008.
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CARP and VRRP both use IP protocol number 112, so there needs to be a -T
flag to specify that protocol 112 be dissected as CARP rather than VRRP.
Also update the man page.
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add PGM upport as per rfc3208
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include "interface.h" before "ipproto.h".
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