[SERIAL] Clean up and fix tty transmission start/stoping

[powerpc.git] / include / net / inet6_hashtables.h

diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index 297c2b1..03df3b1 100644 (file)
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -14,13 +14,117 @@
 #ifndef _INET6_HASHTABLES_H
 #define _INET6_HASHTABLES_H
 
+#include <linux/config.h>
+
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+#include <linux/in6.h>
+#include <linux/ipv6.h>
 #include <linux/types.h>
 
-struct in6_addr;
+#include <net/ipv6.h>
+
 struct inet_hashinfo;
 
+/* I have no idea if this is a good hash for v6 or not. -DaveM */
+static inline int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport,
+                               const struct in6_addr *faddr, const u16 fport,
+                               const int ehash_size)
+{
+       int hashent = (lport ^ fport);
+
+       hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]);
+       hashent ^= hashent >> 16;
+       hashent ^= hashent >> 8;
+       return (hashent & (ehash_size - 1));
+}
+
+static inline int inet6_sk_ehashfn(const struct sock *sk, const int ehash_size)
+{
+       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->num;
+       const __u16 fport = inet->dport;
+       return inet6_ehashfn(laddr, lport, faddr, fport, ehash_size);
+}
+
+/*
+ * 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.
+ */
+static inline struct sock *
+               __inet6_lookup_established(struct inet_hashinfo *hashinfo,
+                                          const struct in6_addr *saddr,
+                                          const u16 sport,
+                                          const struct in6_addr *daddr,
+                                          const u16 hnum,
+                                          const int dif)
+{
+       struct sock *sk;
+       const struct hlist_node *node;
+       const __u32 ports = INET_COMBINED_PORTS(sport, hnum);
+       /* Optimize here for direct hit, only listening connections can
+        * have wildcards anyways.
+        */
+       const int hash = inet6_ehashfn(daddr, hnum, saddr, sport,
+                                      hashinfo->ehash_size);
+       struct inet_ehash_bucket *head = &hashinfo->ehash[hash];
+
+       read_lock(&head->lock);
+       sk_for_each(sk, node, &head->chain) {
+               /* For IPV6 do the cheaper port and family tests first. */
+               if (INET6_MATCH(sk, saddr, daddr, ports, dif))
+                       goto hit; /* You sunk my battleship! */
+       }
+       /* Must check for a TIME_WAIT'er before going to listener hash. */
+       sk_for_each(sk, node, &(head + hashinfo->ehash_size)->chain) {
+               const struct inet_timewait_sock *tw = inet_twsk(sk);
+
+               if(*((__u32 *)&(tw->tw_dport))  == ports        &&
+                  sk->sk_family                == PF_INET6) {
+                       const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
+
+                       if (ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr)        &&
+                           ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr)    &&
+                           (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif))
+                               goto hit;
+               }
+       }
+       read_unlock(&head->lock);
+       return NULL;
+
+hit:
+       sock_hold(sk);
+       read_unlock(&head->lock);
+       return sk;
+}
+
+extern struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo,
+                                         const struct in6_addr *daddr,
+                                         const unsigned short hnum,
+                                         const int dif);
+
+static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo,
+                                         const struct in6_addr *saddr,
+                                         const u16 sport,
+                                         const struct in6_addr *daddr,
+                                         const u16 hnum,
+                                         const int dif)
+{
+       struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport,
+                                                    daddr, hnum, dif);
+       if (sk)
+               return sk;
+
+       return inet6_lookup_listener(hashinfo, daddr, hnum, dif);
+}
+
 extern struct sock *inet6_lookup(struct inet_hashinfo *hashinfo,
                                 const struct in6_addr *saddr, const u16 sport,
                                 const struct in6_addr *daddr, const u16 dport,
                                 const int dif);
+#endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */
 #endif /* _INET6_HASHTABLES_H */