ipvs: fix sparse warnings for some parameters

Some service fields are in network order:

- netmask: used once in network order and also as prefix len for IPv6
- port

Other parameters are in host order:

- struct ip_vs_flags: flags and mask moved between user and kernel only
- sync state: moved between user and kernel only
- syncid: sent over network as single octet

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>

include/net/ip_vs.h

@@ -678,7 +678,7 @@ struct ip_vs_service_user_kern {
 	u16			af;
 	u16			protocol;
 	union nf_inet_addr	addr;		/* virtual ip address */
-	u16			port;
+	__be16			port;
 	u32			fwmark;		/* firwall mark of service */
 
 	/* virtual service options */
@@ -686,14 +686,14 @@ struct ip_vs_service_user_kern {
 	char			*pe_name;
 	unsigned int		flags;		/* virtual service flags */
 	unsigned int		timeout;	/* persistent timeout in sec */
-	u32			netmask;	/* persistent netmask */
+	__be32			netmask;	/* persistent netmask or plen */
 };
 
 
 struct ip_vs_dest_user_kern {
 	/* destination server address */
 	union nf_inet_addr	addr;
-	u16			port;
+	__be16			port;
 
 	/* real server options */
 	unsigned int		conn_flags;	/* connection flags */
@@ -721,7 +721,7 @@ struct ip_vs_service {
 	__u32                   fwmark;   /* firewall mark of the service */
 	unsigned int		flags;	  /* service status flags */
 	unsigned int		timeout;  /* persistent timeout in ticks */
-	__be32			netmask;  /* grouping granularity */
+	__be32			netmask;  /* grouping granularity, mask/plen */
 	struct net		*net;
 
 	struct list_head	destinations;  /* real server d-linked list */

include/uapi/linux/ip_vs.h

@@ -280,8 +280,8 @@ struct ip_vs_daemon_user {
 #define IPVS_GENL_VERSION	0x1
 
 struct ip_vs_flags {
-	__be32 flags;
+	__u32 flags;
-	__be32 mask;
+	__u32 mask;
 };
 
 /* Generic Netlink command attributes */

net/netfilter/ipvs/ip_vs_core.c

@@ -235,7 +235,8 @@ ip_vs_sched_persist(struct ip_vs_service *svc,
 	/* Mask saddr with the netmask to adjust template granularity */
 #ifdef CONFIG_IP_VS_IPV6
 	if (svc->af == AF_INET6)
-		ipv6_addr_prefix(&snet.in6, &iph->saddr.in6, svc->netmask);
+		ipv6_addr_prefix(&snet.in6, &iph->saddr.in6,
+				 (__force __u32) svc->netmask);
 	else
 #endif
 		snet.ip = iph->saddr.ip & svc->netmask;

net/netfilter/ipvs/ip_vs_ctl.c

@@ -1164,9 +1164,13 @@ ip_vs_add_service(struct net *net, struct ip_vs_service_user_kern *u,
 	}
 
 #ifdef CONFIG_IP_VS_IPV6
-	if (u->af == AF_INET6 && (u->netmask < 1 || u->netmask > 128)) {
+	if (u->af == AF_INET6) {
-		ret = -EINVAL;
+		__u32 plen = (__force __u32) u->netmask;
-		goto out_err;
+
+		if (plen < 1 || plen > 128) {
+			ret = -EINVAL;
+			goto out_err;
+		}
 	}
 #endif
 
@@ -1277,9 +1281,13 @@ ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
 	}
 
 #ifdef CONFIG_IP_VS_IPV6
-	if (u->af == AF_INET6 && (u->netmask < 1 || u->netmask > 128)) {
+	if (u->af == AF_INET6) {
-		ret = -EINVAL;
+		__u32 plen = (__force __u32) u->netmask;
-		goto out;
+
+		if (plen < 1 || plen > 128) {
+			ret = -EINVAL;
+			goto out;
+		}
 	}
 #endif
 
@@ -2892,7 +2900,7 @@ static int ip_vs_genl_fill_service(struct sk_buff *skb,
 	} else {
 		if (nla_put_u16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol) ||
 		    nla_put(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr) ||
-		    nla_put_u16(skb, IPVS_SVC_ATTR_PORT, svc->port))
+		    nla_put_be16(skb, IPVS_SVC_ATTR_PORT, svc->port))
 			goto nla_put_failure;
 	}
 
@@ -2902,7 +2910,7 @@ static int ip_vs_genl_fill_service(struct sk_buff *skb,
 	    (pe && nla_put_string(skb, IPVS_SVC_ATTR_PE_NAME, pe->name)) ||
 	    nla_put(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags) ||
 	    nla_put_u32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ) ||
-	    nla_put_u32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
+	    nla_put_be32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
 		goto nla_put_failure;
 	if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &svc->stats))
 		goto nla_put_failure;
@@ -3015,7 +3023,7 @@ static int ip_vs_genl_parse_service(struct net *net,
 	} else {
 		usvc->protocol = nla_get_u16(nla_protocol);
 		nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
-		usvc->port = nla_get_u16(nla_port);
+		usvc->port = nla_get_be16(nla_port);
 		usvc->fwmark = 0;
 	}
 
@@ -3055,7 +3063,7 @@ static int ip_vs_genl_parse_service(struct net *net,
 		usvc->sched_name = nla_data(nla_sched);
 		usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
 		usvc->timeout = nla_get_u32(nla_timeout);
-		usvc->netmask = nla_get_u32(nla_netmask);
+		usvc->netmask = nla_get_be32(nla_netmask);
 	}
 
 	return 0;
@@ -3081,7 +3089,7 @@ static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
 		return -EMSGSIZE;
 
 	if (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr) ||
-	    nla_put_u16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
+	    nla_put_be16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
 	    nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,
 			(atomic_read(&dest->conn_flags) &
 			 IP_VS_CONN_F_FWD_MASK)) ||
@@ -3190,7 +3198,7 @@ static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
 	memset(udest, 0, sizeof(*udest));
 
 	nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
-	udest->port = nla_get_u16(nla_port);
+	udest->port = nla_get_be16(nla_port);
 
 	/* If a full entry was requested, check for the additional fields */
 	if (full_entry) {
@@ -3215,8 +3223,8 @@ static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
 	return 0;
 }
 
-static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __be32 state,
+static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
-				  const char *mcast_ifn, __be32 syncid)
+				  const char *mcast_ifn, __u32 syncid)
 {
 	struct nlattr *nl_daemon;
 
@@ -3237,8 +3245,8 @@ nla_put_failure:
 	return -EMSGSIZE;
 }
 
-static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __be32 state,
+static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
-				  const char *mcast_ifn, __be32 syncid,
+				  const char *mcast_ifn, __u32 syncid,
 				  struct netlink_callback *cb)
 {
 	void *hdr;