firewall protocol supportproto-firewall

Patch by Alexander V. Chernikov <melifaro@ipfw.ru>

Hello list!

This patch adds 'firewall' protocol permitting prefixes announced to
this protocol to be put in configured firewall table with optional value.

Supported firewalls: IPFW, PF, *
Optional value support: IPFW, *

Sample configuration:

protocol bgp {
	..
	import filter { fw_value = 42; accept; } # Set firewall optional value
for each prefix
}

protocol firewall {
        fwtype ipfw;
        fwtable "2";
        export all;
        flush always; # do flush both on startup and shutdown
};

Tested on FreeBSD 8.X, PF should work on Open/NetBSD, too.

[*] I can add support for ipset on demand. However I can't understand
how it can be [effectively] used without some kind of radix/rbtree
backend (according to docs).

P.S.
This can be thought as first step for implementation BGP FlowSpec (RFC 5575)

1 files changed, 3 insertions, 1 deletions

diff --git a/nest/proto.c b/nest/proto.c
index d4a333d0..040dc115 100644
--- a/nest/proto.c
+++ b/nest/proto.c
@@ -1382,7 +1382,9 @@ protos_build(void)
 #ifdef CONFIG_PERF
   proto_build(&proto_perf);
 #endif
-
+#ifdef CONFIG_FIREWALL
+  proto_build(&proto_firewall);
+#endif
   proto_pool = rp_new(&root_pool, "Protocols");
   proto_shutdown_timer = tm_new(proto_pool);
   proto_shutdown_timer->hook = proto_shutdown_loop;