diff options
Diffstat (limited to 'net/ipv4/xfrm4_output.c')
| -rw-r--r-- | net/ipv4/xfrm4_output.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c new file mode 100644 index 000000000..3cff51ba7 --- /dev/null +++ b/net/ipv4/xfrm4_output.c @@ -0,0 +1,46 @@ +// 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_output(struct net *net, struct sock *sk, struct sk_buff *skb) +{ +#ifdef CONFIG_NETFILTER + struct xfrm_state *x = skb_dst(skb)->xfrm; + + if (!x) { + IPCB(skb)->flags |= IPSKB_REROUTED; + return dst_output(net, sk, skb); + } +#endif + + return xfrm_output(sk, skb); +} + +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, skb->dev, 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); +} |