| 1 |
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| 2 | |
| 3 | *
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| 4 | * Copyright (C) 2012-2025 OpenVPN, Inc.
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| 5 | *
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| 6 | * Author: James Yonan <[email protected]>
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| 7 | * Antonio Quartulli <[email protected]>
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| 8 |
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| 9 |
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| 10 | #ifndef _NET_OVPN_OVPNBIND_H_
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| 11 | #define _NET_OVPN_OVPNBIND_H_
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| 12 |
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| 13 | #include <net/ip.h>
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| 14 | #include <linux/in.h>
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| 15 | #include <linux/in6.h>
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| 16 | #include <linux/rcupdate.h>
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| 17 | #include <linux/skbuff.h>
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| 18 | #include <linux/spinlock.h>
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| 19 |
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| 20 | struct ovpn_peer;
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| 21 |
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| 22 | |
| 23 | * union ovpn_sockaddr - basic transport layer address
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| 24 | * @in4: IPv4 address
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| 25 | * @in6: IPv6 address
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| 26 |
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| 27 | union ovpn_sockaddr {
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| 28 | struct sockaddr_in in4;
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| 29 | struct sockaddr_in6 in6;
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| 30 | };
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| 31 |
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| 32 | |
| 33 | * struct ovpn_bind - remote peer binding
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| 34 | * @remote: the remote peer sockaddress
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| 35 | * @local: local endpoint used to talk to the peer
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| 36 | * @local.ipv4: local IPv4 used to talk to the peer
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| 37 | * @local.ipv6: local IPv6 used to talk to the peer
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| 38 | * @rcu: used to schedule RCU cleanup job
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| 39 |
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| 40 | struct ovpn_bind {
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| 41 | union ovpn_sockaddr remote;
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| 42 |
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| 43 | union {
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| 44 | struct in_addr ipv4;
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| 45 | struct in6_addr ipv6;
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| 46 | } local;
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| 47 |
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| 48 | struct rcu_head rcu;
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| 49 | };
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| 50 |
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| 51 | |
| 52 | * ovpn_bind_skb_src_match - match packet source with binding
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| 53 | * @bind: the binding to match
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| 54 | * @skb: the packet to match
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| 55 | *
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| 56 | * Return: true if the packet source matches the remote peer sockaddr
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| 57 | * in the binding
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| 58 |
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| 59 | static inline bool ovpn_bind_skb_src_match(const struct ovpn_bind *bind,
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| 60 | const struct sk_buff *skb)
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| 61 | {
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| 62 | const union ovpn_sockaddr *remote;
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| 63 |
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| 64 | if (unlikely(!bind))
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| 65 | return false;
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| 66 |
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| 67 | remote = &bind->remote;
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| 68 |
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| 69 | switch (skb->protocol) {
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| 70 | case htons(ETH_P_IP):
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| 71 | if (unlikely(remote->in4.sin_family != AF_INET))
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| 72 | return false;
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| 73 |
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| 74 | if (unlikely(remote->in4.sin_addr.s_addr != ip_hdr(skb)->saddr))
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| 75 | return false;
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| 76 |
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| 77 | if (unlikely(remote->in4.sin_port != udp_hdr(skb)->source))
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| 78 | return false;
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| 79 | break;
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| 80 | case htons(ETH_P_IPV6):
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| 81 | if (unlikely(remote->in6.sin6_family != AF_INET6))
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| 82 | return false;
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| 83 |
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| 84 | if (unlikely(!ipv6_addr_equal(&remote->in6.sin6_addr,
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| 85 | &ipv6_hdr(skb)->saddr)))
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| 86 | return false;
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| 87 |
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| 88 | if (unlikely(remote->in6.sin6_port != udp_hdr(skb)->source))
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| 89 | return false;
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| 90 | break;
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| 91 | default:
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| 92 | return false;
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| 93 | }
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| 94 |
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| 95 | return true;
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| 96 | }
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| 97 |
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| 98 | struct ovpn_bind *ovpn_bind_from_sockaddr(const struct sockaddr_storage *sa);
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| 99 | void ovpn_bind_reset(struct ovpn_peer *peer, struct ovpn_bind *bind);
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| 100 |
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| 101 | #endif
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