mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 01:49:36 +00:00
2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* xfrm4_output.c - Common IPsec encapsulation code for IPv4.
|
|
* Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*/
|
|
|
|
#include <linux/if_ether.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/netfilter_ipv4.h>
|
|
#include <net/dst.h>
|
|
#include <net/ip.h>
|
|
#include <net/xfrm.h>
|
|
#include <net/icmp.h>
|
|
|
|
static int xfrm4_tunnel_check_size(struct sk_buff *skb)
|
|
{
|
|
int mtu, ret = 0;
|
|
|
|
if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
|
|
goto out;
|
|
|
|
if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df)
|
|
goto out;
|
|
|
|
mtu = dst_mtu(skb_dst(skb));
|
|
if ((!skb_is_gso(skb) && skb->len > mtu) ||
|
|
(skb_is_gso(skb) &&
|
|
!skb_gso_validate_network_len(skb, ip_skb_dst_mtu(skb->sk, skb)))) {
|
|
skb->protocol = htons(ETH_P_IP);
|
|
|
|
if (skb->sk)
|
|
xfrm_local_error(skb, mtu);
|
|
else
|
|
icmp_send(skb, ICMP_DEST_UNREACH,
|
|
ICMP_FRAG_NEEDED, htonl(mtu));
|
|
ret = -EMSGSIZE;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
|
|
err = xfrm4_tunnel_check_size(skb);
|
|
if (err)
|
|
return err;
|
|
|
|
XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;
|
|
|
|
return xfrm4_extract_header(skb);
|
|
}
|
|
|
|
int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
|
|
#endif
|
|
|
|
return xfrm_output(sk, skb);
|
|
}
|
|
|
|
static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct xfrm_state *x = skb_dst(skb)->xfrm;
|
|
const struct xfrm_state_afinfo *afinfo;
|
|
int ret = -EAFNOSUPPORT;
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
if (!x) {
|
|
IPCB(skb)->flags |= IPSKB_REROUTED;
|
|
return dst_output(net, sk, skb);
|
|
}
|
|
#endif
|
|
|
|
rcu_read_lock();
|
|
afinfo = xfrm_state_afinfo_get_rcu(x->outer_mode.family);
|
|
if (likely(afinfo))
|
|
ret = afinfo->output_finish(sk, skb);
|
|
else
|
|
kfree_skb(skb);
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
|
|
net, sk, skb, NULL, skb_dst(skb)->dev,
|
|
__xfrm4_output,
|
|
!(IPCB(skb)->flags & IPSKB_REROUTED));
|
|
}
|
|
|
|
void xfrm4_local_error(struct sk_buff *skb, u32 mtu)
|
|
{
|
|
struct iphdr *hdr;
|
|
|
|
hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
|
|
ip_local_error(skb->sk, EMSGSIZE, hdr->daddr,
|
|
inet_sk(skb->sk)->inet_dport, mtu);
|
|
}
|