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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
---|---|
2 | #ifndef _NF_SYNPROXY_SHARED_H |
3 | #define _NF_SYNPROXY_SHARED_H |
4 | |
5 | #include <linux/module.h> |
6 | #include <linux/skbuff.h> |
7 | #include <net/ip6_checksum.h> |
8 | #include <net/ip6_route.h> |
9 | #include <net/tcp.h> |
10 | |
11 | #include <net/netfilter/nf_conntrack_seqadj.h> |
12 | #include <net/netfilter/nf_conntrack_synproxy.h> |
13 | |
14 | struct synproxy_stats { |
15 | unsigned int syn_received; |
16 | unsigned int cookie_invalid; |
17 | unsigned int cookie_valid; |
18 | unsigned int cookie_retrans; |
19 | unsigned int conn_reopened; |
20 | }; |
21 | |
22 | struct synproxy_net { |
23 | struct nf_conn *tmpl; |
24 | struct synproxy_stats __percpu *stats; |
25 | unsigned int hook_ref4; |
26 | unsigned int hook_ref6; |
27 | }; |
28 | |
29 | extern unsigned int synproxy_net_id; |
30 | static inline struct synproxy_net *synproxy_pernet(struct net *net) |
31 | { |
32 | return net_generic(net, synproxy_net_id); |
33 | } |
34 | |
35 | struct synproxy_options { |
36 | u8 options; |
37 | u8 wscale; |
38 | u16 mss_option; |
39 | u16 mss_encode; |
40 | u32 tsval; |
41 | u32 tsecr; |
42 | }; |
43 | |
44 | struct nf_synproxy_info; |
45 | bool synproxy_parse_options(const struct sk_buff *skb, unsigned int doff, |
46 | const struct tcphdr *th, |
47 | struct synproxy_options *opts); |
48 | |
49 | void synproxy_init_timestamp_cookie(const struct nf_synproxy_info *info, |
50 | struct synproxy_options *opts); |
51 | |
52 | void synproxy_send_client_synack(struct net *net, const struct sk_buff *skb, |
53 | const struct tcphdr *th, |
54 | const struct synproxy_options *opts); |
55 | |
56 | bool synproxy_recv_client_ack(struct net *net, |
57 | const struct sk_buff *skb, |
58 | const struct tcphdr *th, |
59 | struct synproxy_options *opts, u32 recv_seq); |
60 | |
61 | struct nf_hook_state; |
62 | |
63 | unsigned int ipv4_synproxy_hook(void *priv, struct sk_buff *skb, |
64 | const struct nf_hook_state *nhs); |
65 | int nf_synproxy_ipv4_init(struct synproxy_net *snet, struct net *net); |
66 | void nf_synproxy_ipv4_fini(struct synproxy_net *snet, struct net *net); |
67 | |
68 | #if IS_ENABLED(CONFIG_IPV6) |
69 | void synproxy_send_client_synack_ipv6(struct net *net, |
70 | const struct sk_buff *skb, |
71 | const struct tcphdr *th, |
72 | const struct synproxy_options *opts); |
73 | |
74 | bool synproxy_recv_client_ack_ipv6(struct net *net, const struct sk_buff *skb, |
75 | const struct tcphdr *th, |
76 | struct synproxy_options *opts, u32 recv_seq); |
77 | |
78 | unsigned int ipv6_synproxy_hook(void *priv, struct sk_buff *skb, |
79 | const struct nf_hook_state *nhs); |
80 | int nf_synproxy_ipv6_init(struct synproxy_net *snet, struct net *net); |
81 | void nf_synproxy_ipv6_fini(struct synproxy_net *snet, struct net *net); |
82 | #else |
83 | static inline int |
84 | nf_synproxy_ipv6_init(struct synproxy_net *snet, struct net *net) { return 0; } |
85 | static inline void |
86 | nf_synproxy_ipv6_fini(struct synproxy_net *snet, struct net *net) {}; |
87 | #endif /* CONFIG_IPV6 */ |
88 | |
89 | #endif /* _NF_SYNPROXY_SHARED_H */ |
90 |
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