1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * xfrm4_output.c - Common IPsec encapsulation code for IPv4.
4 * Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au>
5 */
6
7 #include <linux/if_ether.h>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/skbuff.h>
11 #include <linux/netfilter_ipv4.h>
12 #include <net/dst.h>
13 #include <net/ip.h>
14 #include <net/xfrm.h>
15 #include <net/icmp.h>
16
17 static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
18 {
19 #ifdef CONFIG_NETFILTER
20 struct xfrm_state *x = skb_dst(skb)->xfrm;
21
22 if (!x) {
23 IPCB(skb)->flags |= IPSKB_REROUTED;
24 return dst_output(net, sk, skb);
25 }
26 #endif
27
28 return xfrm_output(sk, skb);
29 }
30
31 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
32 {
33 return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
34 net, sk, skb, skb->dev, skb_dst(skb)->dev,
35 __xfrm4_output,
36 !(IPCB(skb)->flags & IPSKB_REROUTED));
37 }
38
39 void xfrm4_local_error(struct sk_buff *skb, u32 mtu)
40 {
41 struct iphdr *hdr;
42
43 hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
44 ip_local_error(skb->sk, EMSGSIZE, hdr->daddr,
45 inet_sk(skb->sk)->inet_dport, mtu);
46 }
47
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