net: Remove the member netns_ok

Every protocol has the 'netns_ok' member and it is euqal to 1. The
'if (!prot->netns_ok)' always false in inet_add_protocol().

Signed-off-by: Yejune Deng <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/protocol.h

···
 	int			(*err_handler)(struct sk_buff *skb, u32 info);
 
 	unsigned int		no_policy:1,
-				netns_ok:1,
 				/* does the protocol do more stringent
 				 * icmp tag validation than simple
 				 * socket lookup?

net/dccp/ipv4.c

···
 	.handler	= dccp_v4_rcv,
 	.err_handler	= dccp_v4_err,
 	.no_policy	= 1,
-	.netns_ok	= 1,
 	.icmp_strict_tag_validation = 1,
 };
 

net/ipv4/af_inet.c

···
 #ifdef CONFIG_IP_MULTICAST
 static const struct net_protocol igmp_protocol = {
 	.handler =	igmp_rcv,
-	.netns_ok =	1,
 };
 #endif
 
···
 	.handler	=	tcp_v4_rcv,
 	.err_handler	=	tcp_v4_err,
 	.no_policy	=	1,
-	.netns_ok	=	1,
 	.icmp_strict_tag_validation = 1,
 };
 
···
 	.handler =	udp_rcv,
 	.err_handler =	udp_err,
 	.no_policy =	1,
-	.netns_ok =	1,
 };
 
 static const struct net_protocol icmp_protocol = {
 	.handler =	icmp_rcv,
 	.err_handler =	icmp_err,
 	.no_policy =	1,
-	.netns_ok =	1,
 };
 
 static __net_init int ipv4_mib_init_net(struct net *net)

net/ipv4/gre_demux.c

···
 static const struct net_protocol net_gre_protocol = {
 	.handler     = gre_rcv,
 	.err_handler = gre_err,
-	.netns_ok    = 1,
 };
 
 static int __init gre_init(void)

net/ipv4/ipmr.c

···
 #ifdef CONFIG_IP_PIMSM_V2
 static const struct net_protocol pim_protocol = {
 	.handler	=	pim_rcv,
-	.netns_ok	=	1,
 };
 #endif
 

net/ipv4/protocol.c

···
 
 int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol)
 {
-	if (!prot->netns_ok) {
-		pr_err("Protocol %u is not namespace aware, cannot register.\n",
-			protocol);
-		return -EINVAL;
-	}
-
 	return !cmpxchg((const struct net_protocol **)&inet_protos[protocol],
 			NULL, prot) ? 0 : -1;
 }

net/ipv4/tunnel4.c

···
 	.handler	=	tunnel4_rcv,
 	.err_handler	=	tunnel4_err,
 	.no_policy	=	1,
-	.netns_ok	=	1,
 };
 
 #if IS_ENABLED(CONFIG_IPV6)
···
 	.handler	=	tunnel64_rcv,
 	.err_handler	=	tunnel64_err,
 	.no_policy	=	1,
-	.netns_ok	=	1,
 };
 #endif
 
···
 	.handler	=	tunnelmpls4_rcv,
 	.err_handler	=	tunnelmpls4_err,
 	.no_policy	=	1,
-	.netns_ok	=	1,
 };
 #endif
 

net/ipv4/udplite.c

···
 	.handler	= udplite_rcv,
 	.err_handler	= udplite_err,
 	.no_policy	= 1,
-	.netns_ok	= 1,
 };
 
 struct proto 	udplite_prot = {

net/ipv4/xfrm4_protocol.c

···
 	.handler	=	xfrm4_esp_rcv,
 	.err_handler	=	xfrm4_esp_err,
 	.no_policy	=	1,
-	.netns_ok	=	1,
 };
 
 static const struct net_protocol ah4_protocol = {
 	.handler	=	xfrm4_ah_rcv,
 	.err_handler	=	xfrm4_ah_err,
 	.no_policy	=	1,
-	.netns_ok	=	1,
 };
 
 static const struct net_protocol ipcomp4_protocol = {
 	.handler	=	xfrm4_ipcomp_rcv,
 	.err_handler	=	xfrm4_ipcomp_err,
 	.no_policy	=	1,
-	.netns_ok	=	1,
 };
 
 static const struct xfrm_input_afinfo xfrm4_input_afinfo = {

net/l2tp/l2tp_ip.c

···
 
 static struct net_protocol l2tp_ip_protocol __read_mostly = {
 	.handler	= l2tp_ip_recv,
-	.netns_ok	= 1,
 };
 
 static int __init l2tp_ip_init(void)

net/sctp/protocol.c

···
 	.handler     = sctp4_rcv,
 	.err_handler = sctp_v4_err,
 	.no_policy   = 1,
-	.netns_ok    = 1,
 	.icmp_strict_tag_validation = 1,
 };