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Linux/net/ipv4/xfrm4_output.c

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  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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