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d7f9b2f1 FFM |
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 | ||
e2f1cbb1 JS |
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 | ||
d7f9b2f1 FFM |
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 | ||
f19438bd JS |
61 | struct nf_hook_state; |
62 | ||
d7f9b2f1 FFM |
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); | |
ad49d86e FFM |
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) {}; | |
d7f9b2f1 FFM |
87 | #endif /* CONFIG_IPV6 */ |
88 | ||
89 | #endif /* _NF_SYNPROXY_SHARED_H */ |