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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         if (hdr_len < 0)
 32                 return hdr_len;
 33         skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
 34         skb_set_network_header(skb, -x->props.header_len);
 35         skb->transport_header = skb->network_header + hdr_len;
 36         __skb_pull(skb, hdr_len);
 37         memmove(ipv6_hdr(skb), iph, hdr_len);
 38         return 0;
 39 }
 40 
 41 /* Remove encapsulation header.
 42  *
 43  * The IP header will be moved over the top of the encapsulation header.
 44  *
 45  * On entry, skb->h shall point to where the IP header should be and skb->nh
 46  * shall be set to where the IP header currently is.  skb->data shall point
 47  * to the start of the payload.
 48  */
 49 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
 50 {
 51         int ihl = skb->data - skb_transport_header(skb);
 52         struct xfrm_offload *xo = xfrm_offload(skb);
 53 
 54         if (skb->transport_header != skb->network_header) {
 55                 memmove(skb_transport_header(skb),
 56                         skb_network_header(skb), ihl);
 57                 skb->network_header = skb->transport_header;
 58         }
 59         ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
 60                                            sizeof(struct ipv6hdr));
 61         if (!xo || !(xo->flags & XFRM_GRO))
 62                 skb_reset_transport_header(skb);
 63         return 0;
 64 }
 65 
 66 static struct xfrm_mode xfrm6_transport_mode = {
 67         .input = xfrm6_transport_input,
 68         .output = xfrm6_transport_output,
 69         .owner = THIS_MODULE,
 70         .encap = XFRM_MODE_TRANSPORT,
 71 };
 72 
 73 static int __init xfrm6_transport_init(void)
 74 {
 75         return xfrm_register_mode(&xfrm6_transport_mode, AF_INET6);
 76 }
 77 
 78 static void __exit xfrm6_transport_exit(void)
 79 {
 80         int err;
 81 
 82         err = xfrm_unregister_mode(&xfrm6_transport_mode, AF_INET6);
 83         BUG_ON(err);
 84 }
 85 
 86 module_init(xfrm6_transport_init);
 87 module_exit(xfrm6_transport_exit);
 88 MODULE_LICENSE("GPL");
 89 MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TRANSPORT);
 90 

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