1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Authors: Lotsa people, from code originally in tcp 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14 #ifndef _INET6_HASHTABLES_H 15 #define _INET6_HASHTABLES_H 16 17 18 #if IS_ENABLED(CONFIG_IPV6) 19 #include <linux/in6.h> 20 #include <linux/ipv6.h> 21 #include <linux/types.h> 22 #include <linux/jhash.h> 23 24 #include <net/inet_sock.h> 25 26 #include <net/ipv6.h> 27 #include <net/netns/hash.h> 28 29 struct inet_hashinfo; 30 31 static inline unsigned int __inet6_ehashfn(const u32 lhash, 32 const u16 lport, 33 const u32 fhash, 34 const __be16 fport, 35 const u32 initval) 36 { 37 const u32 ports = (((u32)lport) << 16) | (__force u32)fport; 38 return jhash_3words(lhash, fhash, ports, initval); 39 } 40 41 int __inet6_hash(struct sock *sk, struct inet_timewait_sock *twp); 42 43 /* 44 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so 45 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM 46 * 47 * The sockhash lock must be held as a reader here. 48 */ 49 struct sock *__inet6_lookup_established(struct net *net, 50 struct inet_hashinfo *hashinfo, 51 const struct in6_addr *saddr, 52 const __be16 sport, 53 const struct in6_addr *daddr, 54 const u16 hnum, const int dif); 55 56 struct sock *inet6_lookup_listener(struct net *net, 57 struct inet_hashinfo *hashinfo, 58 const struct in6_addr *saddr, 59 const __be16 sport, 60 const struct in6_addr *daddr, 61 const unsigned short hnum, const int dif); 62 63 static inline struct sock *__inet6_lookup(struct net *net, 64 struct inet_hashinfo *hashinfo, 65 const struct in6_addr *saddr, 66 const __be16 sport, 67 const struct in6_addr *daddr, 68 const u16 hnum, 69 const int dif) 70 { 71 struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr, 72 sport, daddr, hnum, dif); 73 if (sk) 74 return sk; 75 76 return inet6_lookup_listener(net, hashinfo, saddr, sport, 77 daddr, hnum, dif); 78 } 79 80 static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo, 81 struct sk_buff *skb, 82 const __be16 sport, 83 const __be16 dport) 84 { 85 struct sock *sk = skb_steal_sock(skb); 86 87 if (sk) 88 return sk; 89 90 return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo, 91 &ipv6_hdr(skb)->saddr, sport, 92 &ipv6_hdr(skb)->daddr, ntohs(dport), 93 inet6_iif(skb)); 94 } 95 96 struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, 97 const struct in6_addr *saddr, const __be16 sport, 98 const struct in6_addr *daddr, const __be16 dport, 99 const int dif); 100 #endif /* IS_ENABLED(CONFIG_IPV6) */ 101 #endif /* _INET6_HASHTABLES_H */ 102