linux/net/netfilter/nf_synproxy_core.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2013 Patrick McHardy <[email protected]>
 */

#include <linux/module.h>
#include <linux/skbuff.h>
#include <asm/unaligned.h>
#include <net/tcp.h>
#include <net/netns/generic.h>
#include <linux/proc_fs.h>

#include <linux/netfilter_ipv6.h>
#include <linux/netfilter/nf_synproxy.h>

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_seqadj.h>
#include <net/netfilter/nf_conntrack_synproxy.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/nf_synproxy.h>

unsigned int synproxy_net_id;
EXPORT_SYMBOL_GPL(…);

bool
synproxy_parse_options(const struct sk_buff *skb, unsigned int doff,
		       const struct tcphdr *th, struct synproxy_options *opts)
{ … }
EXPORT_SYMBOL_GPL(…);

static unsigned int
synproxy_options_size(const struct synproxy_options *opts)
{ … }

static void
synproxy_build_options(struct tcphdr *th, const struct synproxy_options *opts)
{ … }

void synproxy_init_timestamp_cookie(const struct nf_synproxy_info *info,
				    struct synproxy_options *opts)
{ … }
EXPORT_SYMBOL_GPL(…);

static void
synproxy_check_timestamp_cookie(struct synproxy_options *opts)
{ … }

static unsigned int
synproxy_tstamp_adjust(struct sk_buff *skb, unsigned int protoff,
		       struct tcphdr *th, struct nf_conn *ct,
		       enum ip_conntrack_info ctinfo,
		       const struct nf_conn_synproxy *synproxy)
{ … }

#ifdef CONFIG_PROC_FS
static void *synproxy_cpu_seq_start(struct seq_file *seq, loff_t *pos)
{ … }

static void *synproxy_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{ … }

static void synproxy_cpu_seq_stop(struct seq_file *seq, void *v)
{ … }

static int synproxy_cpu_seq_show(struct seq_file *seq, void *v)
{ … }

static const struct seq_operations synproxy_cpu_seq_ops = …;

static int __net_init synproxy_proc_init(struct net *net)
{ … }

static void __net_exit synproxy_proc_exit(struct net *net)
{ … }
#else
static int __net_init synproxy_proc_init(struct net *net)
{
	return 0;
}

static void __net_exit synproxy_proc_exit(struct net *net)
{
	return;
}
#endif /* CONFIG_PROC_FS */

static int __net_init synproxy_net_init(struct net *net)
{ … }

static void __net_exit synproxy_net_exit(struct net *net)
{ … }

static struct pernet_operations synproxy_net_ops = …;

static int __init synproxy_core_init(void)
{ … }

static void __exit synproxy_core_exit(void)
{ … }

module_init(…) …;
module_exit(synproxy_core_exit);

static struct iphdr *
synproxy_build_ip(struct net *net, struct sk_buff *skb, __be32 saddr,
		  __be32 daddr)
{ … }

static void
synproxy_send_tcp(struct net *net,
		  const struct sk_buff *skb, struct sk_buff *nskb,
		  struct nf_conntrack *nfct, enum ip_conntrack_info ctinfo,
		  struct iphdr *niph, struct tcphdr *nth,
		  unsigned int tcp_hdr_size)
{ … }

void
synproxy_send_client_synack(struct net *net,
			    const struct sk_buff *skb, const struct tcphdr *th,
			    const struct synproxy_options *opts)
{ … }
EXPORT_SYMBOL_GPL(…);

static void
synproxy_send_server_syn(struct net *net,
			 const struct sk_buff *skb, const struct tcphdr *th,
			 const struct synproxy_options *opts, u32 recv_seq)
{ … }

static void
synproxy_send_server_ack(struct net *net,
			 const struct ip_ct_tcp *state,
			 const struct sk_buff *skb, const struct tcphdr *th,
			 const struct synproxy_options *opts)
{ … }

static void
synproxy_send_client_ack(struct net *net,
			 const struct sk_buff *skb, const struct tcphdr *th,
			 const struct synproxy_options *opts)
{ … }

bool
synproxy_recv_client_ack(struct net *net,
			 const struct sk_buff *skb, const struct tcphdr *th,
			 struct synproxy_options *opts, u32 recv_seq)
{ … }
EXPORT_SYMBOL_GPL(…);

unsigned int
ipv4_synproxy_hook(void *priv, struct sk_buff *skb,
		   const struct nf_hook_state *nhs)
{ … }
EXPORT_SYMBOL_GPL(…);

static const struct nf_hook_ops ipv4_synproxy_ops[] = …;

int nf_synproxy_ipv4_init(struct synproxy_net *snet, struct net *net)
{ … }
EXPORT_SYMBOL_GPL(…);

void nf_synproxy_ipv4_fini(struct synproxy_net *snet, struct net *net)
{ … }
EXPORT_SYMBOL_GPL(…);

#if IS_ENABLED(CONFIG_IPV6)
static struct ipv6hdr *
synproxy_build_ip_ipv6(struct net *net, struct sk_buff *skb,
		       const struct in6_addr *saddr,
		       const struct in6_addr *daddr)
{ … }

static void
synproxy_send_tcp_ipv6(struct net *net,
		       const struct sk_buff *skb, struct sk_buff *nskb,
		       struct nf_conntrack *nfct, enum ip_conntrack_info ctinfo,
		       struct ipv6hdr *niph, struct tcphdr *nth,
		       unsigned int tcp_hdr_size)
{ … }

void
synproxy_send_client_synack_ipv6(struct net *net,
				 const struct sk_buff *skb,
				 const struct tcphdr *th,
				 const struct synproxy_options *opts)
{ … }
EXPORT_SYMBOL_GPL(…);

static void
synproxy_send_server_syn_ipv6(struct net *net, const struct sk_buff *skb,
			      const struct tcphdr *th,
			      const struct synproxy_options *opts, u32 recv_seq)
{ … }

static void
synproxy_send_server_ack_ipv6(struct net *net, const struct ip_ct_tcp *state,
			      const struct sk_buff *skb,
			      const struct tcphdr *th,
			      const struct synproxy_options *opts)
{ … }

static void
synproxy_send_client_ack_ipv6(struct net *net, const struct sk_buff *skb,
			      const struct tcphdr *th,
			      const struct synproxy_options *opts)
{ … }

bool
synproxy_recv_client_ack_ipv6(struct net *net,
			      const struct sk_buff *skb,
			      const struct tcphdr *th,
			      struct synproxy_options *opts, u32 recv_seq)
{ … }
EXPORT_SYMBOL_GPL(…);

unsigned int
ipv6_synproxy_hook(void *priv, struct sk_buff *skb,
		   const struct nf_hook_state *nhs)
{ … }
EXPORT_SYMBOL_GPL(…);

static const struct nf_hook_ops ipv6_synproxy_ops[] = …;

int
nf_synproxy_ipv6_init(struct synproxy_net *snet, struct net *net)
{ … }
EXPORT_SYMBOL_GPL(…);

void
nf_synproxy_ipv6_fini(struct synproxy_net *snet, struct net *net)
{ … }
EXPORT_SYMBOL_GPL(…);
#endif /* CONFIG_IPV6 */

MODULE_LICENSE(…) …;
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;