1 #ifndef _NF_CONNTRACK_SYNPROXY_H
2 #define _NF_CONNTRACK_SYNPROXY_H
4 #include <net/netns/generic.h>
6 struct nf_conn_synproxy {
12 static inline struct nf_conn_synproxy *nfct_synproxy(const struct nf_conn *ct)
14 #if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
15 return nf_ct_ext_find(ct, NF_CT_EXT_SYNPROXY);
21 static inline struct nf_conn_synproxy *nfct_synproxy_ext_add(struct nf_conn *ct)
23 #if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
24 return nf_ct_ext_add(ct, NF_CT_EXT_SYNPROXY, GFP_ATOMIC);
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;
40 struct synproxy_stats __percpu *stats;
43 extern int synproxy_net_id;
44 static inline struct synproxy_net *synproxy_pernet(struct net *net)
46 return net_generic(net, synproxy_net_id);
49 struct synproxy_options {
58 struct xt_synproxy_info;
59 bool synproxy_parse_options(const struct sk_buff *skb, unsigned int doff,
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);
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);
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);
75 #endif /* _NF_CONNTRACK_SYNPROXY_H */