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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->local_df)
 29                 goto out;
 30 
 31         mtu = dst_mtu(skb_dst(skb));
 32         if (skb->len > mtu) {
 33                 if (skb->sk)
 34                         xfrm_local_error(skb, mtu);
 35                 else
 36                         icmp_send(skb, ICMP_DEST_UNREACH,
 37                                   ICMP_FRAG_NEEDED, htonl(mtu));
 38                 ret = -EMSGSIZE;
 39         }
 40 out:
 41         return ret;
 42 }
 43 
 44 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
 45 {
 46         int err;
 47 
 48         err = xfrm4_tunnel_check_size(skb);
 49         if (err)
 50                 return err;
 51 
 52         XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;
 53 
 54         return xfrm4_extract_header(skb);
 55 }
 56 
 57 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
 58 {
 59         int err;
 60 
 61         err = xfrm_inner_extract_output(x, skb);
 62         if (err)
 63                 return err;
 64 
 65         memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 66         IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED;
 67 
 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 sk_buff *skb)
 75 {
 76 #ifdef CONFIG_NETFILTER
 77         if (!skb_dst(skb)->xfrm) {
 78                 IPCB(skb)->flags |= IPSKB_REROUTED;
 79                 return dst_output(skb);
 80         }
 81 
 82         IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
 83 #endif
 84 
 85         skb->protocol = htons(ETH_P_IP);
 86         return xfrm_output(skb);
 87 }
 88 
 89 int xfrm4_output(struct sk_buff *skb)
 90 {
 91         struct dst_entry *dst = skb_dst(skb);
 92         struct xfrm_state *x = dst->xfrm;
 93 
 94         return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, skb,
 95                             NULL, dst->dev,
 96                             x->outer_mode->afinfo->output_finish,
 97                             !(IPCB(skb)->flags & IPSKB_REROUTED));
 98 }
 99 
100 void xfrm4_local_error(struct sk_buff *skb, u32 mtu)
101 {
102         struct iphdr *hdr;
103 
104         hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
105         ip_local_error(skb->sk, EMSGSIZE, hdr->daddr,
106                        inet_sk(skb->sk)->inet_dport, mtu);
107 }
108 

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