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Linux/net/ipv4/xfrm4_mode_transport.c

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  1 /*
  2  * xfrm4_mode_transport.c - Transport mode encapsulation for IPv4.
  3  *
  4  * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
  5  */
  6 
  7 #include <linux/init.h>
  8 #include <linux/kernel.h>
  9 #include <linux/module.h>
 10 #include <linux/skbuff.h>
 11 #include <linux/stringify.h>
 12 #include <net/dst.h>
 13 #include <net/ip.h>
 14 #include <net/xfrm.h>
 15 
 16 /* Add encapsulation header.
 17  *
 18  * The IP header will be moved forward to make space for the encapsulation
 19  * header.
 20  */
 21 static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb)
 22 {
 23         struct iphdr *iph = ip_hdr(skb);
 24         int ihl = iph->ihl * 4;
 25 
 26         skb_set_network_header(skb, -x->props.header_len);
 27         skb->mac_header = skb->network_header +
 28                           offsetof(struct iphdr, protocol);
 29         skb->transport_header = skb->network_header + ihl;
 30         __skb_pull(skb, ihl);
 31         memmove(skb_network_header(skb), iph, ihl);
 32         return 0;
 33 }
 34 
 35 /* Remove encapsulation header.
 36  *
 37  * The IP header will be moved over the top of the encapsulation header.
 38  *
 39  * On entry, skb->h shall point to where the IP header should be and skb->nh
 40  * shall be set to where the IP header currently is.  skb->data shall point
 41  * to the start of the payload.
 42  */
 43 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
 44 {
 45         int ihl = skb->data - skb_transport_header(skb);
 46 
 47         if (skb->transport_header != skb->network_header) {
 48                 memmove(skb_transport_header(skb),
 49                         skb_network_header(skb), ihl);
 50                 skb->network_header = skb->transport_header;
 51         }
 52         ip_hdr(skb)->tot_len = htons(skb->len + ihl);
 53         skb_reset_transport_header(skb);
 54         return 0;
 55 }
 56 
 57 static struct xfrm_mode xfrm4_transport_mode = {
 58         .input = xfrm4_transport_input,
 59         .output = xfrm4_transport_output,
 60         .owner = THIS_MODULE,
 61         .encap = XFRM_MODE_TRANSPORT,
 62 };
 63 
 64 static int __init xfrm4_transport_init(void)
 65 {
 66         return xfrm_register_mode(&xfrm4_transport_mode, AF_INET);
 67 }
 68 
 69 static void __exit xfrm4_transport_exit(void)
 70 {
 71         int err;
 72 
 73         err = xfrm_unregister_mode(&xfrm4_transport_mode, AF_INET);
 74         BUG_ON(err);
 75 }
 76 
 77 module_init(xfrm4_transport_init);
 78 module_exit(xfrm4_transport_exit);
 79 MODULE_LICENSE("GPL");
 80 MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TRANSPORT);
 81 

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