* Add generic ipfw interface tracking API

* Rewrite interface tables to use interface indexes

Kernel changes:
* Add generic interface tracking API:
 - ipfw_iface_ref (must call unlocked, performs lazy init if needed, allocates
  state & bumps ref)
 - ipfw_iface_add_ntfy(UH_WLOCK+WLOCK, links comsumer & runs its callback to
  update ifindex)
 - ipfw_iface_del_ntfy(UH_WLOCK+WLOCK, unlinks consumer)
 - ipfw_iface_unref(unlocked, drops reference)
Additionally, consumer callbacks are called in interface withdrawal/departure.

* Rewrite interface tables to use iface tracking API. Currently tables are
  implemented the following way:
  runtime data is stored as sorted array of {ifidx, val} for existing interfaces
  full data is stored inside namedobj instance (chained hashed table).

* Add IP_FW_XIFLIST opcode to dump status of tracked interfaces

* Pass @chain ptr to most non-locked algorithm callbacks:
  (prepare_add, prepare_del, flush_entry ..). This may be needed for better
  interaction of given algorithm an other ipfw subsystems

* Add optional "change_ti" algorithm handler to permit updating of
  cached table_info pointer (happens in case of table_max resize)

* Fix small bug in ipfw_list_tables()
* Add badd (insert into sorted array) and bdel (remove from sorted array) funcs

Userland changes:
* Add "iflist" cmd to print status of currently tracked interface
* Add stringnum_cmp for better interface/table names sorting

1 files changed, 2 insertions, 0 deletions

diff --git a/sbin/ipfw/main.c b/sbin/ipfw/main.c
index 6d6e456..4dbe7b7 100644
--- a/sbin/ipfw/main.c
+++ b/sbin/ipfw/main.c
@@ -438,6 +438,8 @@ ipfw_main(int oldac, char **oldav)
 			ipfw_list(ac, av, 1 /* show counters */);
 		else if (_substrcmp(*av, "table") == 0)
 			ipfw_table_handler(ac, av);
+		else if (_substrcmp(*av, "iflist") == 0)
+			ipfw_list_tifaces();
 		else
 			errx(EX_USAGE, "bad command `%s'", *av);
 	}