netfilter: convert the proto argument from u8 to u16

The proto in struct xt_match and struct xt_target is u16, when
calling xt_check_target/match, their proto argument is u8,
and will cause truncation, it is harmless to ip packet, since
ip proto is u8

if a etable's match/target has proto that is u16, will cause
the check failure.

and convert be16 to short in bridge/netfilter/ebtables.c

Signed-off-by: Zhang Yu <[e-mail]>
Signed-off-by: Li RongQing <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

include/linux/netfilter/x_tables.h

···
 
 int xt_check_proc_name(const char *name, unsigned int size);
 
-int xt_check_match(struct xt_mtchk_param *, unsigned int size, u_int8_t proto,
+int xt_check_match(struct xt_mtchk_param *, unsigned int size, u16 proto,
 		   bool inv_proto);
-int xt_check_target(struct xt_tgchk_param *, unsigned int size, u_int8_t proto,
+int xt_check_target(struct xt_tgchk_param *, unsigned int size, u16 proto,
 		    bool inv_proto);
 
 int xt_match_to_user(const struct xt_entry_match *m,

net/bridge/netfilter/ebtables.c

···
 	par->match     = match;
 	par->matchinfo = m->data;
 	ret = xt_check_match(par, m->match_size,
-	      e->ethproto, e->invflags & EBT_IPROTO);
+	      ntohs(e->ethproto), e->invflags & EBT_IPROTO);
 	if (ret < 0) {
 		module_put(match->me);
 		return ret;
···
 	par->target   = watcher;
 	par->targinfo = w->data;
 	ret = xt_check_target(par, w->watcher_size,
-	      e->ethproto, e->invflags & EBT_IPROTO);
+	      ntohs(e->ethproto), e->invflags & EBT_IPROTO);
 	if (ret < 0) {
 		module_put(watcher->me);
 		return ret;
···
 	tgpar.target   = target;
 	tgpar.targinfo = t->data;
 	ret = xt_check_target(&tgpar, t->target_size,
-	      e->ethproto, e->invflags & EBT_IPROTO);
+	      ntohs(e->ethproto), e->invflags & EBT_IPROTO);
 	if (ret < 0) {
 		module_put(target->me);
 		goto cleanup_watchers;

net/netfilter/x_tables.c

···
 EXPORT_SYMBOL(xt_check_proc_name);
 
 int xt_check_match(struct xt_mtchk_param *par,
-		   unsigned int size, u_int8_t proto, bool inv_proto)
+		   unsigned int size, u16 proto, bool inv_proto)
 {
 	int ret;
 
···
 EXPORT_SYMBOL(xt_find_jump_offset);
 
 int xt_check_target(struct xt_tgchk_param *par,
-		    unsigned int size, u_int8_t proto, bool inv_proto)
+		    unsigned int size, u16 proto, bool inv_proto)
 {
 	int ret;