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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) &&
 34              !skb_gso_validate_network_len(skb, ip_skb_dst_mtu(skb->sk, skb)))) {
 35                 skb->protocol = htons(ETH_P_IP);
 36 
 37                 if (skb->sk)
 38                         xfrm_local_error(skb, mtu);
 39                 else
 40                         icmp_send(skb, ICMP_DEST_UNREACH,
 41                                   ICMP_FRAG_NEEDED, htonl(mtu));
 42                 ret = -EMSGSIZE;
 43         }
 44 out:
 45         return ret;
 46 }
 47 
 48 int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
 49 {
 50         int err;
 51 
 52         err = xfrm4_tunnel_check_size(skb);
 53         if (err)
 54                 return err;
 55 
 56         XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;
 57 
 58         return xfrm4_extract_header(skb);
 59 }
 60 
 61 int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
 62 {
 63         int err;
 64 
 65         err = xfrm_inner_extract_output(x, skb);
 66         if (err)
 67                 return err;
 68 
 69         IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
 70         skb->protocol = htons(ETH_P_IP);
 71 
 72         return x->outer_mode->output2(x, skb);
 73 }
 74 EXPORT_SYMBOL(xfrm4_prepare_output);
 75 
 76 int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb)
 77 {
 78         memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 79 
 80 #ifdef CONFIG_NETFILTER
 81         IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
 82 #endif
 83 
 84         return xfrm_output(sk, skb);
 85 }
 86 
 87 static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 88 {
 89         struct xfrm_state *x = skb_dst(skb)->xfrm;
 90 
 91 #ifdef CONFIG_NETFILTER
 92         if (!x) {
 93                 IPCB(skb)->flags |= IPSKB_REROUTED;
 94                 return dst_output(net, sk, skb);
 95         }
 96 #endif
 97 
 98         return x->outer_mode->afinfo->output_finish(sk, skb);
 99 }
100 
101 int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
102 {
103         return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
104                             net, sk, skb, NULL, skb_dst(skb)->dev,
105                             __xfrm4_output,
106                             !(IPCB(skb)->flags & IPSKB_REROUTED));
107 }
108 
109 void xfrm4_local_error(struct sk_buff *skb, u32 mtu)
110 {
111         struct iphdr *hdr;
112 
113         hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
114         ip_local_error(skb->sk, EMSGSIZE, hdr->daddr,
115                        inet_sk(skb->sk)->inet_dport, mtu);
116 }
117 

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