linux/net/ipv4/xfrm4_input.c

// SPDX-License-Identifier: GPL-2.0
/*
 * xfrm4_input.c
 *
 * Changes:
 *	YOSHIFUJI Hideaki @USAGI
 *		Split up af-specific portion
 *	Derek Atkins <[email protected]>
 *		Add Encapsulation support
 *
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/protocol.h>
#include <net/gro.h>

static int xfrm4_rcv_encap_finish2(struct net *net, struct sock *sk,
				   struct sk_buff *skb)
{ … }

static inline int xfrm4_rcv_encap_finish(struct net *net, struct sock *sk,
					 struct sk_buff *skb)
{ … }

int xfrm4_transport_finish(struct sk_buff *skb, int async)
{ … }

static int __xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb, bool pull)
{ … }

/* If it's a keepalive packet, then just eat it.
 * If it's an encapsulated packet, then pass it to the
 * IPsec xfrm input.
 * Returns 0 if skb passed to xfrm or was dropped.
 * Returns >0 if skb should be passed to UDP.
 * Returns <0 if skb should be resubmitted (-ret is protocol)
 */
int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
{ … }
EXPORT_SYMBOL(…);

struct sk_buff *xfrm4_gro_udp_encap_rcv(struct sock *sk, struct list_head *head,
					struct sk_buff *skb)
{ … }
EXPORT_SYMBOL(…);

int xfrm4_rcv(struct sk_buff *skb)
{ … }
EXPORT_SYMBOL(…);