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Linux/net/ipv6/xfrm6_mode_transport.c

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  1 /*
  2  * xfrm6_mode_transport.c - Transport mode encapsulation for IPv6.
  3  *
  4  * Copyright (C) 2002 USAGI/WIDE Project
  5  * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
  6  */
  7 
  8 #include <linux/init.h>
  9 #include <linux/kernel.h>
 10 #include <linux/module.h>
 11 #include <linux/skbuff.h>
 12 #include <linux/stringify.h>
 13 #include <net/dst.h>
 14 #include <net/ipv6.h>
 15 #include <net/xfrm.h>
 16 
 17 /* Add encapsulation header.
 18  *
 19  * The IP header and mutable extension headers will be moved forward to make
 20  * space for the encapsulation header.
 21  */
 22 static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb)
 23 {
 24         struct ipv6hdr *iph;
 25         u8 *prevhdr;
 26         int hdr_len;
 27 
 28         iph = ipv6_hdr(skb);
 29 
 30         hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
 31         skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
 32         skb_set_network_header(skb, -x->props.header_len);
 33         skb->transport_header = skb->network_header + hdr_len;
 34         __skb_pull(skb, hdr_len);
 35         memmove(ipv6_hdr(skb), iph, hdr_len);
 36         return 0;
 37 }
 38 
 39 /* Remove encapsulation header.
 40  *
 41  * The IP header will be moved over the top of the encapsulation header.
 42  *
 43  * On entry, skb->h shall point to where the IP header should be and skb->nh
 44  * shall be set to where the IP header currently is.  skb->data shall point
 45  * to the start of the payload.
 46  */
 47 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
 48 {
 49         int ihl = skb->data - skb_transport_header(skb);
 50 
 51         if (skb->transport_header != skb->network_header) {
 52                 memmove(skb_transport_header(skb),
 53                         skb_network_header(skb), ihl);
 54                 skb->network_header = skb->transport_header;
 55         }
 56         ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
 57                                            sizeof(struct ipv6hdr));
 58         skb_reset_transport_header(skb);
 59         return 0;
 60 }
 61 
 62 static struct xfrm_mode xfrm6_transport_mode = {
 63         .input = xfrm6_transport_input,
 64         .output = xfrm6_transport_output,
 65         .owner = THIS_MODULE,
 66         .encap = XFRM_MODE_TRANSPORT,
 67 };
 68 
 69 static int __init xfrm6_transport_init(void)
 70 {
 71         return xfrm_register_mode(&xfrm6_transport_mode, AF_INET6);
 72 }
 73 
 74 static void __exit xfrm6_transport_exit(void)
 75 {
 76         int err;
 77 
 78         err = xfrm_unregister_mode(&xfrm6_transport_mode, AF_INET6);
 79         BUG_ON(err);
 80 }
 81 
 82 module_init(xfrm6_transport_init);
 83 module_exit(xfrm6_transport_exit);
 84 MODULE_LICENSE("GPL");
 85 MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TRANSPORT);
 86 

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