Added a generic gtpv1_message event generated for any GTP message type.
Added specific events for the create/update/delete PDP context
request/response messages.
Addresses #934.
This currently supports automatic decapsulation of GTP-U packets on
UDP port 2152.
The GTPv1 headers for such tunnels can be inspected by handling the
"gtpv1_g_pdu_packet" event, which has a parameter of type "gtpv1_hdr".
Analyzer and test cases are derived from submissions by Carsten Langer.
Addresses #690.
- Make the uid field optional since it's conceptually incorrect
for proxies being treated as tunnels to have it.
- Reordered two fields in the log.
- Reduced the default tunnel expiration interface to something more
reasonable (1 hour).
- Clarify "tunnel_changed" event documentation.
- Make expiration of "Tunnel::active" elements configuration via
"Tunnel::expiration_interval".
- Remove redundant registration of a connection's tunnels in
tunnel/main.bro's "tunnel_changed" handler.
- Rename "parents" field of "Conn::Info" to "tunnel_parents"
to give more context.
Merge remote-tracking branch 'origin/topic/tunnels' into topic/robin/tunnels-merge
* origin/topic/tunnels: (41 commits)
Extend weird names that occur in core packet processing during decapsulation.
Add Teredo analysis option to reduce false positive decapsulation.
Just some cleanup/documentation of new tunnel-handling code.
Memory leak fixes
Add a config.h definition for IPPROTO_IPV4.
Add AYIYA tunnel decapsulation unit test.
Add Teredo-specific events.
Refactor some of the NetSessions routines that recurse on IP packets.
Add independent options to toggle the different decapsulation methods
Add more sanity checks before recursing on encapsulated IP packets.
Suppress Teredo weirds unless decapsulation was successful once before.
Tunnel support performance optimization.
Add Teredo tunnel decapsulation.
Fix for IP tunnel UID persistence.
Fix AYIYA analyzer tag.
Add summary documentation to tunnels/main.bro.
Make tunnels always identifiable by UID, tunnel.log now gets populated.
Some improvements to the AYIYA analyzer.
Remove Tunnel::decapsulate_ip option.
Remove invalid IP-in-IP encapsulated protocol value.
...
Also fix header truncation check for IPv6 No Next header and add an
"ipv6_no_next" weird for such packets that aren't tunneled over Teredo
(which it calls "bubbles" and are used to create mappings in NATs).
conn.log now sets a field indicating all the parent tunnel UIDs over
which a connection operated and cross reference the UIDs found in
the tunnel.log.
Also some renaming of tunnel related types at the scripting layer.
- AYIYA works.
- AYIYA analyzed connections are still labelled wrong in conn.log (logged as syslog)
- Some clean up for left over code.
- Small refactoring to pass packets back from analyzers to core.
- $uid is now optional in conn logs since ip-in-ip tunnel parent's
won't have an actual connection.
