xfrm4_mode_transport.c

Go to the documentation of this file.

/*
 * xfrm4_mode_transport.c - Transport mode encapsulation for IPv4.
 *
 * Copyright (c) 2004-2006 Herbert Xu <[email protected]>
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/stringify.h>
#include <net/dst.h>
#include <net/ip.h>
#include <net/xfrm.h>

/* Add encapsulation header.
 *
 * The IP header will be moved forward to make space for the encapsulation
 * header.
 */
static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb)
{
    struct iphdr *iph = ip_hdr(skb);
    int ihl = iph->ihl * 4;

    skb_set_network_header(skb, -x->props.header_len);
    skb->mac_header = skb->network_header +
              offsetof(struct iphdr, protocol);
    skb->transport_header = skb->network_header + ihl;
    __skb_pull(skb, ihl);
    memmove(skb_network_header(skb), iph, ihl);
    return 0;
}

/* Remove encapsulation header.
 *
 * The IP header will be moved over the top of the encapsulation header.
 *
 * On entry, skb->h shall point to where the IP header should be and skb->nh
 * shall be set to where the IP header currently is.  skb->data shall point
 * to the start of the payload.
 */
static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
{
    int ihl = skb->data - skb_transport_header(skb);

    if (skb->transport_header != skb->network_header) {
        memmove(skb_transport_header(skb),
            skb_network_header(skb), ihl);
        skb->network_header = skb->transport_header;
    }
    ip_hdr(skb)->tot_len = htons(skb->len + ihl);
    skb_reset_transport_header(skb);
    return 0;
}

static struct xfrm_mode xfrm4_transport_mode = {
    .input = xfrm4_transport_input,
    .output = xfrm4_transport_output,
    .owner = THIS_MODULE,
    .encap = XFRM_MODE_TRANSPORT,
};

static int __init xfrm4_transport_init(void)
{
    return xfrm_register_mode(&xfrm4_transport_mode, AF_INET);
}

static void __exit xfrm4_transport_exit(void)
{
    int err;

    err = xfrm_unregister_mode(&xfrm4_transport_mode, AF_INET);
    BUG_ON(err);
}

module_init(xfrm4_transport_init);
module_exit(xfrm4_transport_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TRANSPORT);