udp: Move udp[46]_portaddr_hash() to net/ip[v6].h

This patch moves the udp[46]_portaddr_hash()
to net/ip[v6].h.  The function name is renamed to
ipv[46]_portaddr_hash().

It will be used by a later patch which adds a second listener
hashtable hashed by the address and port.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip.h

@@ -26,12 +26,14 @@
 #include <linux/ip.h>
 #include <linux/in.h>
 #include <linux/skbuff.h>
+#include <linux/jhash.h>
 
 #include <net/inet_sock.h>
 #include <net/route.h>
 #include <net/snmp.h>
 #include <net/flow.h>
 #include <net/flow_dissector.h>
+#include <net/netns/hash.h>
 
 #define IPV4_MAX_PMTU		65535U		/* RFC 2675, Section 5.1 */
 
@@ -521,6 +523,13 @@ static inline unsigned int ipv4_addr_hash(__be32 ip)
 	return (__force unsigned int) ip;
 }
 
+static inline u32 ipv4_portaddr_hash(const struct net *net,
+				     __be32 saddr,
+				     unsigned int port)
+{
+	return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
+}
+
 bool ip_call_ra_chain(struct sk_buff *skb);
 
 /*

include/net/ipv6.h

@@ -22,6 +22,7 @@
 #include <net/flow.h>
 #include <net/flow_dissector.h>
 #include <net/snmp.h>
+#include <net/netns/hash.h>
 
 #define SIN6_LEN_RFC2133	24
 
@@ -673,6 +674,22 @@ static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
 					cpu_to_be32(0x0000ffff))) == 0UL;
 }
 
+static inline u32 ipv6_portaddr_hash(const struct net *net,
+				     const struct in6_addr *addr6,
+				     unsigned int port)
+{
+	unsigned int hash, mix = net_hash_mix(net);
+
+	if (ipv6_addr_any(addr6))
+		hash = jhash_1word(0, mix);
+	else if (ipv6_addr_v4mapped(addr6))
+		hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
+	else
+		hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
+
+	return hash ^ port;
+}
+
 /*
  * Check for a RFC 4843 ORCHID address
  * (Overlay Routable Cryptographic Hash Identifiers)

net/ipv4/udp.c

@@ -357,18 +357,12 @@ fail:
 }
 EXPORT_SYMBOL(udp_lib_get_port);
 
-static u32 udp4_portaddr_hash(const struct net *net, __be32 saddr,
-			      unsigned int port)
-{
-	return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
-}
-
 int udp_v4_get_port(struct sock *sk, unsigned short snum)
 {
 	unsigned int hash2_nulladdr =
-		udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum);
+		ipv4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum);
 	unsigned int hash2_partial =
-		udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0);
+		ipv4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0);
 
 	/* precompute partial secondary hash */
 	udp_sk(sk)->udp_portaddr_hash = hash2_partial;
@@ -485,7 +479,7 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
 	u32 hash = 0;
 
 	if (hslot->count > 10) {
-		hash2 = udp4_portaddr_hash(net, daddr, hnum);
+		hash2 = ipv4_portaddr_hash(net, daddr, hnum);
 		slot2 = hash2 & udptable->mask;
 		hslot2 = &udptable->hash2[slot2];
 		if (hslot->count < hslot2->count)
@@ -496,7 +490,7 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
 					  exact_dif, hslot2, skb);
 		if (!result) {
 			unsigned int old_slot2 = slot2;
-			hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
+			hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
 			slot2 = hash2 & udptable->mask;
 			/* avoid searching the same slot again. */
 			if (unlikely(slot2 == old_slot2))
@@ -1761,7 +1755,7 @@ EXPORT_SYMBOL(udp_lib_rehash);
 
 static void udp_v4_rehash(struct sock *sk)
 {
-	u16 new_hash = udp4_portaddr_hash(sock_net(sk),
+	u16 new_hash = ipv4_portaddr_hash(sock_net(sk),
 					  inet_sk(sk)->inet_rcv_saddr,
 					  inet_sk(sk)->inet_num);
 	udp_lib_rehash(sk, new_hash);
@@ -1952,9 +1946,9 @@ static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
 	struct sk_buff *nskb;
 
 	if (use_hash2) {
-		hash2_any = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum) &
+		hash2_any = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum) &
 			    udptable->mask;
-		hash2 = udp4_portaddr_hash(net, daddr, hnum) & udptable->mask;
+		hash2 = ipv4_portaddr_hash(net, daddr, hnum) & udptable->mask;
 start_lookup:
 		hslot = &udptable->hash2[hash2];
 		offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
@@ -2186,7 +2180,7 @@ static struct sock *__udp4_lib_demux_lookup(struct net *net,
 					    int dif, int sdif)
 {
 	unsigned short hnum = ntohs(loc_port);
-	unsigned int hash2 = udp4_portaddr_hash(net, loc_addr, hnum);
+	unsigned int hash2 = ipv4_portaddr_hash(net, loc_addr, hnum);
 	unsigned int slot2 = hash2 & udp_table.mask;
 	struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
 	INET_ADDR_COOKIE(acookie, rmt_addr, loc_addr);

net/ipv6/udp.c

@@ -89,28 +89,12 @@ static u32 udp6_ehashfn(const struct net *net,
 			       udp_ipv6_hash_secret + net_hash_mix(net));
 }
 
-static u32 udp6_portaddr_hash(const struct net *net,
-			      const struct in6_addr *addr6,
-			      unsigned int port)
-{
-	unsigned int hash, mix = net_hash_mix(net);
-
-	if (ipv6_addr_any(addr6))
-		hash = jhash_1word(0, mix);
-	else if (ipv6_addr_v4mapped(addr6))
-		hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
-	else
-		hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
-
-	return hash ^ port;
-}
-
 int udp_v6_get_port(struct sock *sk, unsigned short snum)
 {
 	unsigned int hash2_nulladdr =
-		udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
+		ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
 	unsigned int hash2_partial =
-		udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
+		ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0);
 
 	/* precompute partial secondary hash */
 	udp_sk(sk)->udp_portaddr_hash = hash2_partial;
@@ -119,7 +103,7 @@ int udp_v6_get_port(struct sock *sk, unsigned short snum)
 
 static void udp_v6_rehash(struct sock *sk)
 {
-	u16 new_hash = udp6_portaddr_hash(sock_net(sk),
+	u16 new_hash = ipv6_portaddr_hash(sock_net(sk),
 					  &sk->sk_v6_rcv_saddr,
 					  inet_sk(sk)->inet_num);
 
@@ -225,7 +209,7 @@ struct sock *__udp6_lib_lookup(struct net *net,
 	u32 hash = 0;
 
 	if (hslot->count > 10) {
-		hash2 = udp6_portaddr_hash(net, daddr, hnum);
+		hash2 = ipv6_portaddr_hash(net, daddr, hnum);
 		slot2 = hash2 & udptable->mask;
 		hslot2 = &udptable->hash2[slot2];
 		if (hslot->count < hslot2->count)
@@ -236,7 +220,7 @@ struct sock *__udp6_lib_lookup(struct net *net,
 					  hslot2, skb);
 		if (!result) {
 			unsigned int old_slot2 = slot2;
-			hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
+			hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
 			slot2 = hash2 & udptable->mask;
 			/* avoid searching the same slot again. */
 			if (unlikely(slot2 == old_slot2))
@@ -705,9 +689,9 @@ static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
 	struct sk_buff *nskb;
 
 	if (use_hash2) {
-		hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
+		hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) &
 			    udptable->mask;
-		hash2 = udp6_portaddr_hash(net, daddr, hnum) & udptable->mask;
+		hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask;
 start_lookup:
 		hslot = &udptable->hash2[hash2];
 		offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
@@ -895,7 +879,7 @@ static struct sock *__udp6_lib_demux_lookup(struct net *net,
 			int dif, int sdif)
 {
 	unsigned short hnum = ntohs(loc_port);
-	unsigned int hash2 = udp6_portaddr_hash(net, loc_addr, hnum);
+	unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum);
 	unsigned int slot2 = hash2 & udp_table.mask;
 	struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
 	const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);