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; 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); 65 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); 69 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); 74 75 #endif /* _NF_CONNTRACK_SYNPROXY_H */ 76