1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * Authors: Lotsa people, from code originally in tcp 8 */ 9 10 #ifndef _INET6_HASHTABLES_H 11 #define _INET6_HASHTABLES_H 12 13 14 #if IS_ENABLED(CONFIG_IPV6) 15 #include <linux/in6.h> 16 #include <linux/ipv6.h> 17 #include <linux/types.h> 18 #include <linux/jhash.h> 19 20 #include <net/inet_sock.h> 21 22 #include <net/ipv6.h> 23 #include <net/netns/hash.h> 24 25 struct inet_hashinfo; 26 27 static inline unsigned int __inet6_ehashfn(const u32 lhash, 28 const u16 lport, 29 const u32 fhash, 30 const __be16 fport, 31 const u32 initval) 32 { 33 const u32 ports = (((u32)lport) << 16) | (__force u32)fport; 34 return jhash_3words(lhash, fhash, ports, initval); 35 } 36 37 /* 38 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so 39 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM 40 * 41 * The sockhash lock must be held as a reader here. 42 */ 43 struct sock *__inet6_lookup_established(struct net *net, 44 struct inet_hashinfo *hashinfo, 45 const struct in6_addr *saddr, 46 const __be16 sport, 47 const struct in6_addr *daddr, 48 const u16 hnum, const int dif, 49 const int sdif); 50 51 struct sock *inet6_lookup_listener(struct net *net, 52 struct inet_hashinfo *hashinfo, 53 struct sk_buff *skb, int doff, 54 const struct in6_addr *saddr, 55 const __be16 sport, 56 const struct in6_addr *daddr, 57 const unsigned short hnum, 58 const int dif, const int sdif); 59 60 static inline struct sock *__inet6_lookup(struct net *net, 61 struct inet_hashinfo *hashinfo, 62 struct sk_buff *skb, int doff, 63 const struct in6_addr *saddr, 64 const __be16 sport, 65 const struct in6_addr *daddr, 66 const u16 hnum, 67 const int dif, const int sdif, 68 bool *refcounted) 69 { 70 struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr, 71 sport, daddr, hnum, 72 dif, sdif); 73 *refcounted = true; 74 if (sk) 75 return sk; 76 *refcounted = false; 77 return inet6_lookup_listener(net, hashinfo, skb, doff, saddr, sport, 78 daddr, hnum, dif, sdif); 79 } 80 81 static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo, 82 struct sk_buff *skb, int doff, 83 const __be16 sport, 84 const __be16 dport, 85 int iif, int sdif, 86 bool *refcounted) 87 { 88 struct sock *sk = skb_steal_sock(skb, refcounted); 89 90 if (sk) 91 return sk; 92 93 return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb, 94 doff, &ipv6_hdr(skb)->saddr, sport, 95 &ipv6_hdr(skb)->daddr, ntohs(dport), 96 iif, sdif, refcounted); 97 } 98 99 struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, 100 struct sk_buff *skb, int doff, 101 const struct in6_addr *saddr, const __be16 sport, 102 const struct in6_addr *daddr, const __be16 dport, 103 const int dif); 104 105 int inet6_hash(struct sock *sk); 106 107 static inline bool inet6_match(struct net *net, const struct sock *sk, 108 const struct in6_addr *saddr, 109 const struct in6_addr *daddr, 110 const __portpair ports, 111 const int dif, const int sdif) 112 { 113 int bound_dev_if; 114 115 if (!net_eq(sock_net(sk), net) || 116 sk->sk_family != AF_INET6 || 117 sk->sk_portpair != ports || 118 !ipv6_addr_equal(&sk->sk_v6_daddr, saddr) || 119 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) 120 return false; 121 122 bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); 123 return bound_dev_if == dif || bound_dev_if == sdif; 124 } 125 #endif /* IS_ENABLED(CONFIG_IPV6) */ 126 127 #endif /* _INET6_HASHTABLES_H */ 128