For vendors like Juniper, extensibility for sockets is important. A

good example is socket options that aren't necessarily generic.  To
this end, OSD is added to the socket structure and hooks are defined
for key operations on sockets.  These are:
o   soalloc() and sodealloc()
o   Get and set socket options
o   Socket related kevent filters.

One aspect about hhook that appears to be not fully baked is the return
semantics (the return value from the hook is ignored in hhook_run_hooks()
at the time of commit).  To support return values, the socket_hhook_data
structure contains a 'status' field to hold return values.

Submitted by:	Anuranjan Shukla <anshukla@juniper.net>
Obtained from:	Juniper Networks, Inc.

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/sys/khelp.h b/sys/sys/khelp.h
index db12d6b..f542b14 100644
--- a/sys/sys/khelp.h
+++ b/sys/sys/khelp.h
@@ -55,6 +55,7 @@ struct osd;
 
 /* Helper classes. */
 #define	HELPER_CLASS_TCP	0x00000001
+#define	HELPER_CLASS_SOCKET	0x00000002
 
 /* Public KPI functions. */
 int	khelp_register_helper(struct helper *h);