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| 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 | |
| 14 | struct 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 | |
| 22 | struct 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 | |
| 29 | extern unsigned int synproxy_net_id; |
| 30 | static inline struct synproxy_net *synproxy_pernet(struct net *net) |
| 31 | { |
| 32 | return net_generic(net, synproxy_net_id); |
| 33 | } |
| 34 | |
| 35 | struct synproxy_options { |
| 36 | u8 options; |
| 37 | u8 wscale; |
| 38 | u16 mss_option; |
| 39 | u16 mss_encode; |
| 40 | u32 tsval; |
| 41 | u32 tsecr; |
| 42 | }; |
| 43 | |
| 44 | struct nf_synproxy_info; |
| 45 | bool synproxy_parse_options(const struct sk_buff *skb, unsigned int doff, |
| 46 | const struct tcphdr *th, |
| 47 | struct synproxy_options *opts); |
| 48 | |
| 49 | void synproxy_init_timestamp_cookie(const struct nf_synproxy_info *info, |
| 50 | struct synproxy_options *opts); |
| 51 | |
| 52 | void synproxy_send_client_synack(struct net *net, const struct sk_buff *skb, |
| 53 | const struct tcphdr *th, |
| 54 | const struct synproxy_options *opts); |
| 55 | |
| 56 | bool 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 | |
| 61 | struct nf_hook_state; |
| 62 | |
| 63 | unsigned int ipv4_synproxy_hook(void *priv, struct sk_buff *skb, |
| 64 | const struct nf_hook_state *nhs); |
| 65 | int nf_synproxy_ipv4_init(struct synproxy_net *snet, struct net *net); |
| 66 | void nf_synproxy_ipv4_fini(struct synproxy_net *snet, struct net *net); |
| 67 | |
| 68 | #if IS_ENABLED(CONFIG_IPV6) |
| 69 | void 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 | |
| 74 | bool 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 | |
| 78 | unsigned int ipv6_synproxy_hook(void *priv, struct sk_buff *skb, |
| 79 | const struct nf_hook_state *nhs); |
| 80 | int nf_synproxy_ipv6_init(struct synproxy_net *snet, struct net *net); |
| 81 | void nf_synproxy_ipv6_fini(struct synproxy_net *snet, struct net *net); |
| 82 | #else |
| 83 | static inline int |
| 84 | nf_synproxy_ipv6_init(struct synproxy_net *snet, struct net *net) { return 0; } |
| 85 | static inline void |
| 86 | nf_synproxy_ipv6_fini(struct synproxy_net *snet, struct net *net) {}; |
| 87 | #endif /* CONFIG_IPV6 */ |
| 88 | |
| 89 | #endif /* _NF_SYNPROXY_SHARED_H */ |
| 90 |
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