| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
|---|---|
| 2 | /* OpenVPN data channel offload |
| 3 | * |
| 4 | * Copyright (C) 2012-2025 OpenVPN, Inc. |
| 5 | * |
| 6 | * Author: James Yonan <james@openvpn.net> |
| 7 | * Antonio Quartulli <antonio@openvpn.net> |
| 8 | */ |
| 9 | |
| 10 | #ifndef _NET_OVPN_OVPNBIND_H_ |
| 11 | #define _NET_OVPN_OVPNBIND_H_ |
| 12 | |
| 13 | #include <net/ip.h> |
| 14 | #include <linux/in.h> |
| 15 | #include <linux/in6.h> |
| 16 | #include <linux/rcupdate.h> |
| 17 | #include <linux/skbuff.h> |
| 18 | #include <linux/spinlock.h> |
| 19 | |
| 20 | struct ovpn_peer; |
| 21 | |
| 22 | /** |
| 23 | * union ovpn_sockaddr - basic transport layer address |
| 24 | * @in4: IPv4 address |
| 25 | * @in6: IPv6 address |
| 26 | */ |
| 27 | union ovpn_sockaddr { |
| 28 | struct sockaddr_in in4; |
| 29 | struct sockaddr_in6 in6; |
| 30 | }; |
| 31 | |
| 32 | /** |
| 33 | * struct ovpn_bind - remote peer binding |
| 34 | * @remote: the remote peer sockaddress |
| 35 | * @local: local endpoint used to talk to the peer |
| 36 | * @local.ipv4: local IPv4 used to talk to the peer |
| 37 | * @local.ipv6: local IPv6 used to talk to the peer |
| 38 | * @rcu: used to schedule RCU cleanup job |
| 39 | */ |
| 40 | struct ovpn_bind { |
| 41 | union ovpn_sockaddr remote; /* remote sockaddr */ |
| 42 | |
| 43 | union { |
| 44 | struct in_addr ipv4; |
| 45 | struct in6_addr ipv6; |
| 46 | } local; |
| 47 | |
| 48 | struct rcu_head rcu; |
| 49 | }; |
| 50 | |
| 51 | /** |
| 52 | * ovpn_bind_skb_src_match - match packet source with binding |
| 53 | * @bind: the binding to match |
| 54 | * @skb: the packet to match |
| 55 | * |
| 56 | * Return: true if the packet source matches the remote peer sockaddr |
| 57 | * in the binding |
| 58 | */ |
| 59 | static inline bool ovpn_bind_skb_src_match(const struct ovpn_bind *bind, |
| 60 | const struct sk_buff *skb) |
| 61 | { |
| 62 | const union ovpn_sockaddr *remote; |
| 63 | |
| 64 | if (unlikely(!bind)) |
| 65 | return false; |
| 66 | |
| 67 | remote = &bind->remote; |
| 68 | |
| 69 | switch (skb->protocol) { |
| 70 | case htons(ETH_P_IP): |
| 71 | if (unlikely(remote->in4.sin_family != AF_INET)) |
| 72 | return false; |
| 73 | |
| 74 | if (unlikely(remote->in4.sin_addr.s_addr != ip_hdr(skb)->saddr)) |
| 75 | return false; |
| 76 | |
| 77 | if (unlikely(remote->in4.sin_port != udp_hdr(skb)->source)) |
| 78 | return false; |
| 79 | break; |
| 80 | case htons(ETH_P_IPV6): |
| 81 | if (unlikely(remote->in6.sin6_family != AF_INET6)) |
| 82 | return false; |
| 83 | |
| 84 | if (unlikely(!ipv6_addr_equal(&remote->in6.sin6_addr, |
| 85 | &ipv6_hdr(skb)->saddr))) |
| 86 | return false; |
| 87 | |
| 88 | if (unlikely(remote->in6.sin6_port != udp_hdr(skb)->source)) |
| 89 | return false; |
| 90 | break; |
| 91 | default: |
| 92 | return false; |
| 93 | } |
| 94 | |
| 95 | return true; |
| 96 | } |
| 97 | |
| 98 | struct ovpn_bind *ovpn_bind_from_sockaddr(const struct sockaddr_storage *sa); |
| 99 | void ovpn_bind_reset(struct ovpn_peer *peer, struct ovpn_bind *bind); |
| 100 | |
| 101 | #endif /* _NET_OVPN_OVPNBIND_H_ */ |
| 102 |