1 files changed, 114 insertions, 0 deletions
diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
new file mode 100644
index 00000000..00cbb438
--- /dev/null
+++ b/include/net/inet6_hashtables.h
@@ -0,0 +1,114 @@
+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ * Authors:	Lotsa people, from code originally in tcp
+ *
+ *	This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _INET6_HASHTABLES_H
+#define _INET6_HASHTABLES_H
+
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <linux/in6.h>
+#include <linux/ipv6.h>
+#include <linux/types.h>
+#include <linux/jhash.h>
+
+#include <net/inet_sock.h>
+
+#include <net/ipv6.h>
+#include <net/netns/hash.h>
+
+struct inet_hashinfo;
+
+/* I have no idea if this is a good hash for v6 or not. -DaveM */
+static inline unsigned int inet6_ehashfn(struct net *net,
+				const struct in6_addr *laddr, const u16 lport,
+				const struct in6_addr *faddr, const __be16 fport)
+{
+	u32 ports = (lport ^ (__force u16)fport);
+
+	return jhash_3words((__force u32)laddr->s6_addr32[3],
+			    (__force u32)faddr->s6_addr32[3],
+			    ports, inet_ehash_secret + net_hash_mix(net));
+}
+
+static inline int inet6_sk_ehashfn(const struct sock *sk)
+{
+	const struct inet_sock *inet = inet_sk(sk);
+	const struct ipv6_pinfo *np = inet6_sk(sk);
+	const struct in6_addr *laddr = &np->rcv_saddr;
+	const struct in6_addr *faddr = &np->daddr;
+	const __u16 lport = inet->inet_num;
+	const __be16 fport = inet->inet_dport;
+	struct net *net = sock_net(sk);
+
+	return inet6_ehashfn(net, laddr, lport, faddr, fport);
+}
+
+extern int __inet6_hash(struct sock *sk, struct inet_timewait_sock *twp);
+
+/*
+ * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
+ * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
+ *
+ * The sockhash lock must be held as a reader here.
+ */
+extern struct sock *__inet6_lookup_established(struct net *net,
+					   struct inet_hashinfo *hashinfo,
+					   const struct in6_addr *saddr,
+					   const __be16 sport,
+					   const struct in6_addr *daddr,
+					   const u16 hnum,
+					   const int dif);
+
+extern struct sock *inet6_lookup_listener(struct net *net,
+					  struct inet_hashinfo *hashinfo,
+					  const struct in6_addr *daddr,
+					  const unsigned short hnum,
+					  const int dif);
+
+static inline struct sock *__inet6_lookup(struct net *net,
+					  struct inet_hashinfo *hashinfo,
+					  const struct in6_addr *saddr,
+					  const __be16 sport,
+					  const struct in6_addr *daddr,
+					  const u16 hnum,
+					  const int dif)
+{
+	struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr,
+						sport, daddr, hnum, dif);
+	if (sk)
+		return sk;
+
+	return inet6_lookup_listener(net, hashinfo, daddr, hnum, dif);
+}
+
+static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
+					      struct sk_buff *skb,
+					      const __be16 sport,
+					      const __be16 dport)
+{
+	struct sock *sk;
+
+	if (unlikely(sk = skb_steal_sock(skb)))
+		return sk;
+	else return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
+				   &ipv6_hdr(skb)->saddr, sport,
+				   &ipv6_hdr(skb)->daddr, ntohs(dport),
+				   inet6_iif(skb));
+}
+
+extern struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
+				 const struct in6_addr *saddr, const __be16 sport,
+				 const struct in6_addr *daddr, const __be16 dport,
+				 const int dif);
+#endif /* IS_ENABLED(CONFIG_IPV6) */
+#endif /* _INET6_HASHTABLES_H */