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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_is_gso(skb) && skb->len > mtu) ||
 33             (skb_is_gso(skb) && skb_gso_network_seglen(skb) > ip_skb_dst_mtu(skb->sk, skb))) {
 34                 skb->protocol = htons(ETH_P_IP);
 35 
 36                 if (skb->sk)
 37                         xfrm_local_error(skb, mtu);
 38                 else
 39                         icmp_send(skb, ICMP_DEST_UNREACH,
 40                                   ICMP_FRAG_NEEDED, htonl(mtu));
 41                 ret = -EMSGSIZE;
 42         }
 43 out:
 44         return ret;
 45 }
 46 
 47 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
 48 {
 49         int err;
 50 
 51         err = xfrm4_tunnel_check_size(skb);
 52         if (err)
 53                 return err;
 54 
 55         XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;
 56 
 57         return xfrm4_extract_header(skb);
 58 }
 59 
 60 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
 61 {
 62         int err;
 63 
 64         err = xfrm_inner_extract_output(x, skb);
 65         if (err)
 66                 return err;
 67 
 68         IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
 69         skb->protocol = htons(ETH_P_IP);
 70 
 71         return x->outer_mode->output2(x, skb);
 72 }
 73 EXPORT_SYMBOL(xfrm4_prepare_output);
 74 
 75 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb)
 76 {
 77         memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 78 
 79 #ifdef CONFIG_NETFILTER
 80         IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
 81 #endif
 82 
 83         return xfrm_output(sk, skb);
 84 }
 85 
 86 static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 87 {
 88         struct xfrm_state *x = skb_dst(skb)->xfrm;
 89 
 90 #ifdef CONFIG_NETFILTER
 91         if (!x) {
 92                 IPCB(skb)->flags |= IPSKB_REROUTED;
 93                 return dst_output(net, sk, skb);
 94         }
 95 #endif
 96 
 97         return x->outer_mode->afinfo->output_finish(sk, skb);
 98 }
 99 
100 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
101 {
102         return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
103                             net, sk, skb, NULL, skb_dst(skb)->dev,
104                             __xfrm4_output,
105                             !(IPCB(skb)->flags & IPSKB_REROUTED));
106 }
107 
108 void xfrm4_local_error(struct sk_buff *skb, u32 mtu)
109 {
110         struct iphdr *hdr;
111 
112         hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
113         ip_local_error(skb->sk, EMSGSIZE, hdr->daddr,
114                        inet_sk(skb->sk)->inet_dport, mtu);
115 }
116 

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