linux/net/ipv4/netfilter/nf_socket_ipv4.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2007-2008 BalaBit IT Ltd.
 * Author: Krisztian Kovacs
 */
#define pr_fmt(fmt) …
#include <linux/module.h>
#include <linux/skbuff.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <net/icmp.h>
#include <net/sock.h>
#include <net/inet_sock.h>
#include <net/netfilter/nf_socket.h>
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <net/netfilter/nf_conntrack.h>
#endif

static int
extract_icmp4_fields(const struct sk_buff *skb, u8 *protocol,
		     __be32 *raddr, __be32 *laddr,
		     __be16 *rport, __be16 *lport)
{ … }

static struct sock *
nf_socket_get_sock_v4(struct net *net, struct sk_buff *skb, const int doff,
		      const u8 protocol,
		      const __be32 saddr, const __be32 daddr,
		      const __be16 sport, const __be16 dport,
		      const struct net_device *in)
{ … }

struct sock *nf_sk_lookup_slow_v4(struct net *net, const struct sk_buff *skb,
				  const struct net_device *indev)
{ … }
EXPORT_SYMBOL_GPL(…);

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