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Linux/net/ipv4/xfrm4_output.c

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  1 /*
  2  * xfrm4_output.c - Common IPsec encapsulation code for IPv4.
  3  * Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au>
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of the GNU General Public License
  7  * as published by the Free Software Foundation; either version
  8  * 2 of the License, or (at your option) any later version.
  9  */
 10 
 11 #include <linux/if_ether.h>
 12 #include <linux/kernel.h>
 13 #include <linux/module.h>
 14 #include <linux/skbuff.h>
 15 #include <linux/netfilter_ipv4.h>
 16 #include <net/dst.h>
 17 #include <net/ip.h>
 18 #include <net/xfrm.h>
 19 #include <net/icmp.h>
 20 
 21 static int xfrm4_tunnel_check_size(struct sk_buff *skb)
 22 {
 23         int mtu, ret = 0;
 24 
 25         if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
 26                 goto out;
 27 
 28         if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df)
 29                 goto out;
 30 
 31         mtu = dst_mtu(skb_dst(skb));
 32         if (skb->len > mtu) {
 33                 skb->protocol = htons(ETH_P_IP);
 34 
 35                 if (skb->sk)
 36                         xfrm_local_error(skb, mtu);
 37                 else
 38                         icmp_send(skb, ICMP_DEST_UNREACH,
 39                                   ICMP_FRAG_NEEDED, htonl(mtu));
 40                 ret = -EMSGSIZE;
 41         }
 42 out:
 43         return ret;
 44 }
 45 
 46 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
 47 {
 48         int err;
 49 
 50         err = xfrm4_tunnel_check_size(skb);
 51         if (err)
 52                 return err;
 53 
 54         XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;
 55 
 56         return xfrm4_extract_header(skb);
 57 }
 58 
 59 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
 60 {
 61         int err;
 62 
 63         err = xfrm_inner_extract_output(x, skb);
 64         if (err)
 65                 return err;
 66 
 67         IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
 68         skb->protocol = htons(ETH_P_IP);
 69 
 70         return x->outer_mode->output2(x, skb);
 71 }
 72 EXPORT_SYMBOL(xfrm4_prepare_output);
 73 
 74 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb)
 75 {
 76         memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 77 
 78 #ifdef CONFIG_NETFILTER
 79         IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
 80 #endif
 81 
 82         return xfrm_output(sk, skb);
 83 }
 84 
 85 static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 86 {
 87         struct xfrm_state *x = skb_dst(skb)->xfrm;
 88 
 89 #ifdef CONFIG_NETFILTER
 90         if (!x) {
 91                 IPCB(skb)->flags |= IPSKB_REROUTED;
 92                 return dst_output(net, sk, skb);
 93         }
 94 #endif
 95 
 96         return x->outer_mode->afinfo->output_finish(sk, skb);
 97 }
 98 
 99 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
100 {
101         return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
102                             net, sk, skb, NULL, skb_dst(skb)->dev,
103                             __xfrm4_output,
104                             !(IPCB(skb)->flags & IPSKB_REROUTED));
105 }
106 
107 void xfrm4_local_error(struct sk_buff *skb, u32 mtu)
108 {
109         struct iphdr *hdr;
110 
111         hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
112         ip_local_error(skb->sk, EMSGSIZE, hdr->daddr,
113                        inet_sk(skb->sk)->inet_dport, mtu);
114 }
115 

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