LXR linux/include/net/netfilter/nf

   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 */
  90