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48b1de4c PM |
1 | #ifndef _NF_CONNTRACK_SYNPROXY_H |
2 | #define _NF_CONNTRACK_SYNPROXY_H | |
3 | ||
4 | #include <net/netns/generic.h> | |
5 | ||
6 | struct nf_conn_synproxy { | |
7 | u32 isn; | |
8 | u32 its; | |
9 | u32 tsoff; | |
10 | }; | |
11 | ||
12 | static inline struct nf_conn_synproxy *nfct_synproxy(const struct nf_conn *ct) | |
13 | { | |
14 | #if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY) | |
15 | return nf_ct_ext_find(ct, NF_CT_EXT_SYNPROXY); | |
16 | #else | |
17 | return NULL; | |
18 | #endif | |
19 | } | |
20 | ||
21 | static inline struct nf_conn_synproxy *nfct_synproxy_ext_add(struct nf_conn *ct) | |
22 | { | |
23 | #if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY) | |
24 | return nf_ct_ext_add(ct, NF_CT_EXT_SYNPROXY, GFP_ATOMIC); | |
25 | #else | |
26 | return NULL; | |
27 | #endif | |
28 | } | |
29 | ||
30 | struct synproxy_stats { | |
31 | unsigned int syn_received; | |
32 | unsigned int cookie_invalid; | |
33 | unsigned int cookie_valid; | |
34 | unsigned int cookie_retrans; | |
35 | unsigned int conn_reopened; | |
36 | }; | |
37 | ||
38 | struct synproxy_net { | |
39 | struct nf_conn *tmpl; | |
40 | struct synproxy_stats __percpu *stats; | |
41 | }; | |
42 | ||
43 | extern int synproxy_net_id; | |
44 | static inline struct synproxy_net *synproxy_pernet(struct net *net) | |
45 | { | |
46 | return net_generic(net, synproxy_net_id); | |
47 | } | |
48 | ||
49 | struct synproxy_options { | |
50 | u8 options; | |
51 | u8 wscale; | |
52 | u16 mss; | |
53 | u32 tsval; | |
54 | u32 tsecr; | |
55 | }; | |
56 | ||
57 | struct tcphdr; | |
58 | struct xt_synproxy_info; | |
4fbef95a | 59 | bool synproxy_parse_options(const struct sk_buff *skb, unsigned int doff, |
4e77be46 JP |
60 | const struct tcphdr *th, |
61 | struct synproxy_options *opts); | |
62 | unsigned int synproxy_options_size(const struct synproxy_options *opts); | |
63 | void synproxy_build_options(struct tcphdr *th, | |
64 | const struct synproxy_options *opts); | |
48b1de4c | 65 | |
4e77be46 JP |
66 | void synproxy_init_timestamp_cookie(const struct xt_synproxy_info *info, |
67 | struct synproxy_options *opts); | |
68 | void synproxy_check_timestamp_cookie(struct synproxy_options *opts); | |
48b1de4c | 69 | |
4e77be46 JP |
70 | unsigned int synproxy_tstamp_adjust(struct sk_buff *skb, unsigned int protoff, |
71 | struct tcphdr *th, struct nf_conn *ct, | |
72 | enum ip_conntrack_info ctinfo, | |
73 | const struct nf_conn_synproxy *synproxy); | |
48b1de4c PM |
74 | |
75 | #endif /* _NF_CONNTRACK_SYNPROXY_H */ |