libdlpi with libpcap

[sagun shakya <Sagun.Shakya () Sun COM>]

Scope:
------
Add libpcap support for upcoming Solaris features such as vanity naming, 
IP Tunneling and IP observability.

Reason for changes:
-------------------
When the features mentioned above integrate into Solaris, an extensible 
way to open DLPI links under different directories will be required. The 
libdlpi(3LIB) library provides an interface that provides an abstraction 
around this so that DLPI applications do not need to know where the 
actual DLPI link is located in the filesystem.

Improvements after adding support to libpcap:
---------------------------------------------
* Observe all IP layer network traffic, including loopback, IPMP group, 
IP tunnel traffic and IP layer network traffic flowing to and from a zone.

* Currently, pcap_findalldevs() which lists all the network devices on
the system for packet capturing uses SIOCGLIFCONF to generate the list 
on Solaris. This limits the lists to network devices that are plumbed IP 
interfaces. libdlpi has an interface dlpi_walk(), which will walk all 
the network device, thus will provide a complete list.

I would like to hear from you for suggestions on how libpcap can be
updated to libdlpi. I have a couple of possible approaches to make this 
addition but they may not necessarily be the best approach:

1) Introduce a new pcap-libdlpi-solaris.c file which will handle all the
versions of Solaris with libdlpi. The existing pcap-dlpi.c will continue
working for pre-libdlpi versions of Solaris.

2) Continue with the use of ifdef #HAVE_SOLARIS approach in the existing
pcap-dlpi.c file to call libdlpi functions for releases that support
libdlpi.

3) Instead of using libdlpi, add support to open different directories, 
i.e /dev/net, /dev/ipnet, and add other Solaris-specific ioctls to the 
existing pcap-dlpi.c file under #ifdef protection.

Just to state the obvious, once we come to a conclusion, fixes to the
necessary makefiles, configure.in etc will be made. Also a
README.solaris for notes on using libpcap on Solaris will be added.

I would appreciate your comment or suggestion. Please also cc
clearview-discuss () opensolaris org so other members of our project can
participate in the discussion.

For further information on the details for features mentioned above, 
check the Clearview Project website: 
http://www.opensolaris.org/os/project/clearview/

Thanks,

Sagun

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