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
__inet6_ehashfn(const u32 lhash,const u16 lport,const u32 fhash,const __be16 fport,const u32 initval)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
__inet6_lookup(struct net * net,struct inet_hashinfo * hashinfo,struct sk_buff * skb,int doff,const struct in6_addr * saddr,const __be16 sport,const struct in6_addr * daddr,const u16 hnum,const int dif,const int sdif,bool * refcounted)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
__inet6_lookup_skb(struct inet_hashinfo * hashinfo,struct sk_buff * skb,int doff,const __be16 sport,const __be16 dport,int iif,int sdif,bool * refcounted)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
inet6_match(struct net * net,const struct sock * sk,const struct in6_addr * saddr,const struct in6_addr * daddr,const __portpair ports,const int dif,const int sdif)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 if (!net_eq(sock_net(sk), net) ||
114 sk->sk_family != AF_INET6 ||
115 sk->sk_portpair != ports ||
116 !ipv6_addr_equal(&sk->sk_v6_daddr, saddr) ||
117 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
118 return false;
119
120 /* READ_ONCE() paired with WRITE_ONCE() in sock_bindtoindex_locked() */
121 return inet_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif,
122 sdif);
123 }
124 #endif /* IS_ENABLED(CONFIG_IPV6) */
125
126 #endif /* _INET6_HASHTABLES_H */
127