/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _NF_SYNPROXY_SHARED_H
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#define _NF_SYNPROXY_SHARED_H
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <net/ip6_checksum.h>
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#include <net/ip6_route.h>
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#include <net/tcp.h>
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#include <net/netfilter/nf_conntrack_seqadj.h>
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#include <net/netfilter/nf_conntrack_synproxy.h>
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struct synproxy_stats {
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unsigned int syn_received;
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unsigned int cookie_invalid;
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unsigned int cookie_valid;
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unsigned int cookie_retrans;
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unsigned int conn_reopened;
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};
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struct synproxy_net {
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struct nf_conn *tmpl;
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struct synproxy_stats __percpu *stats;
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unsigned int hook_ref4;
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unsigned int hook_ref6;
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};
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extern unsigned int synproxy_net_id;
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static inline struct synproxy_net *synproxy_pernet(struct net *net)
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{
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return net_generic(net, synproxy_net_id);
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}
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struct synproxy_options {
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u8 options;
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u8 wscale;
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u16 mss_option;
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u16 mss_encode;
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u32 tsval;
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u32 tsecr;
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};
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struct nf_synproxy_info;
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bool synproxy_parse_options(const struct sk_buff *skb, unsigned int doff,
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const struct tcphdr *th,
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struct synproxy_options *opts);
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void synproxy_init_timestamp_cookie(const struct nf_synproxy_info *info,
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struct synproxy_options *opts);
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void synproxy_send_client_synack(struct net *net, const struct sk_buff *skb,
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const struct tcphdr *th,
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const struct synproxy_options *opts);
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bool synproxy_recv_client_ack(struct net *net,
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const struct sk_buff *skb,
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const struct tcphdr *th,
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struct synproxy_options *opts, u32 recv_seq);
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struct nf_hook_state;
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unsigned int ipv4_synproxy_hook(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *nhs);
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int nf_synproxy_ipv4_init(struct synproxy_net *snet, struct net *net);
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void nf_synproxy_ipv4_fini(struct synproxy_net *snet, struct net *net);
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#if IS_ENABLED(CONFIG_IPV6)
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void synproxy_send_client_synack_ipv6(struct net *net,
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const struct sk_buff *skb,
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const struct tcphdr *th,
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const struct synproxy_options *opts);
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bool synproxy_recv_client_ack_ipv6(struct net *net, const struct sk_buff *skb,
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const struct tcphdr *th,
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struct synproxy_options *opts, u32 recv_seq);
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unsigned int ipv6_synproxy_hook(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *nhs);
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int nf_synproxy_ipv6_init(struct synproxy_net *snet, struct net *net);
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void nf_synproxy_ipv6_fini(struct synproxy_net *snet, struct net *net);
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#else
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static inline int
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nf_synproxy_ipv6_init(struct synproxy_net *snet, struct net *net) { return 0; }
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static inline void
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nf_synproxy_ipv6_fini(struct synproxy_net *snet, struct net *net) {};
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#endif /* CONFIG_IPV6 */
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#endif /* _NF_SYNPROXY_SHARED_H */
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