nf_synproxy.h (2688B)
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 14struct 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 22struct 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 29extern unsigned int synproxy_net_id; 30static inline struct synproxy_net *synproxy_pernet(struct net *net) 31{ 32 return net_generic(net, synproxy_net_id); 33} 34 35struct synproxy_options { 36 u8 options; 37 u8 wscale; 38 u16 mss_option; 39 u16 mss_encode; 40 u32 tsval; 41 u32 tsecr; 42}; 43 44struct nf_synproxy_info; 45bool synproxy_parse_options(const struct sk_buff *skb, unsigned int doff, 46 const struct tcphdr *th, 47 struct synproxy_options *opts); 48 49void synproxy_init_timestamp_cookie(const struct nf_synproxy_info *info, 50 struct synproxy_options *opts); 51 52void synproxy_send_client_synack(struct net *net, const struct sk_buff *skb, 53 const struct tcphdr *th, 54 const struct synproxy_options *opts); 55 56bool 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 61struct nf_hook_state; 62 63unsigned int ipv4_synproxy_hook(void *priv, struct sk_buff *skb, 64 const struct nf_hook_state *nhs); 65int nf_synproxy_ipv4_init(struct synproxy_net *snet, struct net *net); 66void nf_synproxy_ipv4_fini(struct synproxy_net *snet, struct net *net); 67 68#if IS_ENABLED(CONFIG_IPV6) 69void 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 74bool 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 78unsigned int ipv6_synproxy_hook(void *priv, struct sk_buff *skb, 79 const struct nf_hook_state *nhs); 80int nf_synproxy_ipv6_init(struct synproxy_net *snet, struct net *net); 81void nf_synproxy_ipv6_fini(struct synproxy_net *snet, struct net *net); 82#else 83static inline int 84nf_synproxy_ipv6_init(struct synproxy_net *snet, struct net *net) { return 0; } 85static inline void 86nf_synproxy_ipv6_fini(struct synproxy_net *snet, struct net *net) {}; 87#endif /* CONFIG_IPV6 */ 88 89#endif /* _NF_SYNPROXY_SHARED_H */