- Add some helper hook points to the TCP stack. The hooks allow Khelp modules to

  access inbound/outbound events and associated data for established TCP
  connections. The hooks only run if at least one hook function is registered
  for the hook point, ensuring the impact on the stack is effectively nil when
  no TCP Khelp modules are loaded. struct tcp_hhook_data is passed as contextual
  data to any registered Khelp module hook functions.

- Add an OSD (Object Specific Data) pointer to struct tcpcb to allow Khelp
  modules to associate per-connection data with the TCP control block.

- Bump __FreeBSD_version and add a note to UPDATING regarding to ABI changes
  introduced by this commit and r216753.

In collaboration with:	David Hayes <dahayes at swin edu au> and
				Grenville Armitage <garmitage at swin edu au>
Sponsored by:	FreeBSD Foundation
Reviewed by:	bz, others along the way
MFC after:	3 months

1 files changed, 7 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index 0323738..b4c302d 100644
--- a/UPDATING
+++ b/UPDATING
@@ -22,6 +22,13 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 9.x IS SLOW:
 	machines to maximize performance.  (To disable malloc debugging, run
 	ln -s aj /etc/malloc.conf.)
 
+20101228:
+	The TCP stack has been modified to allow Khelp modules to interact with
+	it via helper hook points and store per-connection data in the TCP
+	control block. Bump __FreeBSD_version to 900029. User space tools that
+	rely on the size of struct tcpcb in tcp_var.h (e.g. sockstat) need to
+	be recompiled.
+
 20101114:
 	Generic IEEE 802.3 annex 31B full duplex flow control support has been
 	added to mii(4) and bge(4), bce(4), msk(4), nfe(4) and stge(4) along