Commit | Line | Data |
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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
505cbfc5 ACM |
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 | |
505cbfc5 ACM |
8 | */ |
9 | ||
10 | #ifndef _INET6_HASHTABLES_H | |
11 | #define _INET6_HASHTABLES_H | |
12 | ||
5324a040 | 13 | |
dfd56b8b | 14 | #if IS_ENABLED(CONFIG_IPV6) |
5324a040 ACM |
15 | #include <linux/in6.h> |
16 | #include <linux/ipv6.h> | |
505cbfc5 | 17 | #include <linux/types.h> |
b3da2cf3 DM |
18 | #include <linux/jhash.h> |
19 | ||
20 | #include <net/inet_sock.h> | |
505cbfc5 | 21 | |
5324a040 | 22 | #include <net/ipv6.h> |
0b441916 | 23 | #include <net/netns/hash.h> |
5324a040 | 24 | |
505cbfc5 ACM |
25 | struct inet_hashinfo; |
26 | ||
b50026b5 HFS |
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) | |
5324a040 | 32 | { |
b50026b5 HFS |
33 | const u32 ports = (((u32)lport) << 16) | (__force u32)fport; |
34 | return jhash_3words(lhash, fhash, ports, initval); | |
5324a040 ACM |
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 | */ | |
1fd51155 JP |
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, | |
4297a0ef DA |
48 | const u16 hnum, const int dif, |
49 | const int sdif); | |
1fd51155 | 50 | |
0f495f76 LB |
51 | typedef u32 (inet6_ehashfn_t)(const struct net *net, |
52 | const struct in6_addr *laddr, const u16 lport, | |
53 | const struct in6_addr *faddr, const __be16 fport); | |
54 | ||
55 | inet6_ehashfn_t inet6_ehashfn; | |
56 | ||
57 | INDIRECT_CALLABLE_DECLARE(inet6_ehashfn_t udp6_ehashfn); | |
58 | ||
ce796e60 LB |
59 | struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk, |
60 | struct sk_buff *skb, int doff, | |
61 | const struct in6_addr *saddr, | |
62 | __be16 sport, | |
63 | const struct in6_addr *daddr, | |
0f495f76 LB |
64 | unsigned short hnum, |
65 | inet6_ehashfn_t *ehashfn); | |
ce796e60 | 66 | |
1fd51155 JP |
67 | struct sock *inet6_lookup_listener(struct net *net, |
68 | struct inet_hashinfo *hashinfo, | |
a583636a | 69 | struct sk_buff *skb, int doff, |
1fd51155 JP |
70 | const struct in6_addr *saddr, |
71 | const __be16 sport, | |
72 | const struct in6_addr *daddr, | |
4297a0ef DA |
73 | const unsigned short hnum, |
74 | const int dif, const int sdif); | |
5324a040 | 75 | |
6c886db2 LB |
76 | struct sock *inet6_lookup_run_sk_lookup(struct net *net, |
77 | int protocol, | |
78 | struct sk_buff *skb, int doff, | |
79 | const struct in6_addr *saddr, | |
80 | const __be16 sport, | |
81 | const struct in6_addr *daddr, | |
82 | const u16 hnum, const int dif, | |
83 | inet6_ehashfn_t *ehashfn); | |
84 | ||
d86e0dac PE |
85 | static inline struct sock *__inet6_lookup(struct net *net, |
86 | struct inet_hashinfo *hashinfo, | |
a583636a | 87 | struct sk_buff *skb, int doff, |
5324a040 | 88 | const struct in6_addr *saddr, |
d2ecd9cc | 89 | const __be16 sport, |
5324a040 ACM |
90 | const struct in6_addr *daddr, |
91 | const u16 hnum, | |
4297a0ef | 92 | const int dif, const int sdif, |
3b24d854 | 93 | bool *refcounted) |
5324a040 | 94 | { |
d86e0dac | 95 | struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr, |
4297a0ef DA |
96 | sport, daddr, hnum, |
97 | dif, sdif); | |
3b24d854 | 98 | *refcounted = true; |
5324a040 ACM |
99 | if (sk) |
100 | return sk; | |
3b24d854 | 101 | *refcounted = false; |
a583636a | 102 | return inet6_lookup_listener(net, hashinfo, skb, doff, saddr, sport, |
4297a0ef | 103 | daddr, hnum, dif, sdif); |
5324a040 ACM |
104 | } |
105 | ||
9c02bec9 LB |
106 | static inline |
107 | struct sock *inet6_steal_sock(struct net *net, struct sk_buff *skb, int doff, | |
108 | const struct in6_addr *saddr, const __be16 sport, | |
109 | const struct in6_addr *daddr, const __be16 dport, | |
110 | bool *refcounted, inet6_ehashfn_t *ehashfn) | |
111 | { | |
112 | struct sock *sk, *reuse_sk; | |
113 | bool prefetched; | |
114 | ||
115 | sk = skb_steal_sock(skb, refcounted, &prefetched); | |
116 | if (!sk) | |
117 | return NULL; | |
118 | ||
8897562f | 119 | if (!prefetched || !sk_fullsock(sk)) |
9c02bec9 LB |
120 | return sk; |
121 | ||
122 | if (sk->sk_protocol == IPPROTO_TCP) { | |
123 | if (sk->sk_state != TCP_LISTEN) | |
124 | return sk; | |
125 | } else if (sk->sk_protocol == IPPROTO_UDP) { | |
126 | if (sk->sk_state != TCP_CLOSE) | |
127 | return sk; | |
128 | } else { | |
129 | return sk; | |
130 | } | |
131 | ||
132 | reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff, | |
133 | saddr, sport, daddr, ntohs(dport), | |
134 | ehashfn); | |
135 | if (!reuse_sk) | |
136 | return sk; | |
137 | ||
138 | /* We've chosen a new reuseport sock which is never refcounted. This | |
139 | * implies that sk also isn't refcounted. | |
140 | */ | |
141 | WARN_ON_ONCE(*refcounted); | |
142 | ||
143 | return reuse_sk; | |
144 | } | |
145 | ||
9a1f27c4 | 146 | static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo, |
a583636a | 147 | struct sk_buff *skb, int doff, |
9a1f27c4 | 148 | const __be16 sport, |
870c3151 | 149 | const __be16 dport, |
4297a0ef | 150 | int iif, int sdif, |
3b24d854 | 151 | bool *refcounted) |
9a1f27c4 | 152 | { |
9c02bec9 LB |
153 | struct net *net = dev_net(skb_dst(skb)->dev); |
154 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
155 | struct sock *sk; | |
156 | ||
157 | sk = inet6_steal_sock(net, skb, doff, &ip6h->saddr, sport, &ip6h->daddr, dport, | |
158 | refcounted, inet6_ehashfn); | |
159 | if (IS_ERR(sk)) | |
160 | return NULL; | |
c7109986 | 161 | if (sk) |
23542618 | 162 | return sk; |
c7109986 | 163 | |
9c02bec9 LB |
164 | return __inet6_lookup(net, hashinfo, skb, |
165 | doff, &ip6h->saddr, sport, | |
166 | &ip6h->daddr, ntohs(dport), | |
4297a0ef | 167 | iif, sdif, refcounted); |
9a1f27c4 ACM |
168 | } |
169 | ||
1fd51155 | 170 | struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
a583636a | 171 | struct sk_buff *skb, int doff, |
1fd51155 JP |
172 | const struct in6_addr *saddr, const __be16 sport, |
173 | const struct in6_addr *daddr, const __be16 dport, | |
174 | const int dif); | |
496611d7 CG |
175 | |
176 | int inet6_hash(struct sock *sk); | |
25de4668 | 177 | |
5d368f03 ED |
178 | static inline bool inet6_match(struct net *net, const struct sock *sk, |
179 | const struct in6_addr *saddr, | |
180 | const struct in6_addr *daddr, | |
181 | const __portpair ports, | |
182 | const int dif, const int sdif) | |
183 | { | |
5d368f03 ED |
184 | if (!net_eq(sock_net(sk), net) || |
185 | sk->sk_family != AF_INET6 || | |
186 | sk->sk_portpair != ports || | |
187 | !ipv6_addr_equal(&sk->sk_v6_daddr, saddr) || | |
188 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
189 | return false; | |
190 | ||
944fd1ae MM |
191 | /* READ_ONCE() paired with WRITE_ONCE() in sock_bindtoindex_locked() */ |
192 | return inet_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, | |
193 | sdif); | |
5d368f03 ED |
194 | } |
195 | #endif /* IS_ENABLED(CONFIG_IPV6) */ | |
25de4668 | 196 | |
505cbfc5 | 197 | #endif /* _INET6_HASHTABLES_H */ |