Mark Netgraph TTY, KAME IPSEC, and IPX/SPX as requiring Giant for correct

operation using NET_NEEDS_GIANT().  This will result in a boot-time
restoration of Giant-enabled network operation, or run-time warning on
dynamic load (applicable only to the Netgraph component).  Additional
components will likely need to be marked with this in the future.

sys/netgraph/ng_tty.c

@@ -75,6 +75,8 @@
 #include <netgraph/netgraph.h>
 #include <netgraph/ng_tty.h>
 
+NET_NEEDS_GIANT("ng_tty");
+
 /* Misc defs */
 #define MAX_MBUFQ		3	/* Max number of queued mbufs */
 #define NGT_HIWATER		400	/* High water mark on output */

sys/netinet6/ipsec.c

@@ -110,6 +110,8 @@ int ipsec_debug = 1;
 int ipsec_debug = 0;
 #endif
 
+NET_NEEDS_GIANT("ipsec");
+
 struct ipsecstat ipsecstat;
 int ip4_ah_cleartos = 1;
 int ip4_ah_offsetmask = 0;	/* maybe IP_DF? */

sys/netipx/ipx.c

@@ -38,6 +38,7 @@
 __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
+#include <sys/kernel.h>
 #include <sys/systm.h>
 #include <sys/malloc.h>
 #include <sys/sockio.h>
@@ -50,6 +51,11 @@ __FBSDID("$FreeBSD$");
 #include <netipx/ipx_if.h>
 #include <netipx/ipx_var.h>
 
+NET_NEEDS_GIANT("ipx");
+
+/*
+ * XXXRW: Requires synchronization.
+ */
 struct ipx_ifaddr *ipx_ifaddr;
 
 static	void ipx_ifscrub(struct ifnet *ifp, struct ipx_ifaddr *ia);