Add spares to the network stack for FreeBSD-9:

- TCP keep* timers
- TCP UTO (adjust from what was there already)
- netmap
- route caching
- user cookie (temporary to allow for the real fix)

Slightly re-shuffle struct ifnet moving fields out of the middle
of spares and to better align.

Discussed with:	rwatson (slightly earlier version)

3 files changed, 8 insertions, 4 deletions

diff --git a/sys/netinet/in_pcb.h b/sys/netinet/in_pcb.h
index dfef963..55270ec 100644
--- a/sys/netinet/in_pcb.h
+++ b/sys/netinet/in_pcb.h
@@ -179,8 +179,9 @@ struct inpcb {
 	u_char	inp_ip_minttl;		/* (i) minimum TTL or drop */
 	uint32_t inp_flowid;		/* (x) flow id / queue id */
 	u_int	inp_refcount;		/* (i) refcount */
-	void	*inp_pspare[4];		/* (x) rtentry / general use */
-	u_int	inp_ispare[4];		/* general use */
+	void	*inp_pspare[5];		/* (x) route caching / general use */
+	u_int	inp_ispare[6];		/* (x) route caching / user cookie /
+					 *     general use */
 
 	/* Local and foreign ports, local and foreign addr. */
 	struct	in_conninfo inp_inc;	/* (i/p) list for PCB's local port */
diff --git a/sys/netinet/tcp_syncache.h b/sys/netinet/tcp_syncache.h
index ddfa459..5783b6d 100644
--- a/sys/netinet/tcp_syncache.h
+++ b/sys/netinet/tcp_syncache.h
@@ -81,6 +81,8 @@ struct syncache {
 #endif			
 	struct label	*sc_label;		/* MAC label reference */
 	struct ucred	*sc_cred;		/* cred cache for jail checks */
+
+	u_int32_t	sc_spare[2];		/* UTO */
 };
 
 /*
diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h
index e8189b0..bbf392f 100644
--- a/sys/netinet/tcp_var.h
+++ b/sys/netinet/tcp_var.h
@@ -203,9 +203,9 @@ struct tcpcb {
 	struct cc_var	*ccv;		/* congestion control specific vars */
 	struct osd	*osd;		/* storage for Khelp module data */
 
-	int	t_ispare;		/* explicit pad for 64bit alignment */
+	uint32_t t_ispare[12];		/* 4 keep timers, 5 UTO, 3 TBD */
 	void	*t_pspare2[4];		/* 4 TBD */
-	uint64_t _pad[12];		/* 7 UTO, 5 TBD (1-2 CC/RTT?) */
+	uint64_t _pad[6];		/* 6 TBD (1-2 CC/RTT?) */
 };
 
 /*
@@ -300,6 +300,7 @@ struct tcpopt {
 	u_int16_t	to_mss;		/* maximum segment size */
 	u_int8_t	to_wscale;	/* window scaling */
 	u_int8_t	to_nsacks;	/* number of SACK blocks */
+	u_int32_t	to_spare;	/* UTO */
 };
 
 /*