forked from luck/tmp_suning_uos_patched
eb878e8457
Expose IPSEC modes output path to take an xfrm state as input param. This makes it consistent with the input mode processing (which already takes the xfrm state as a param). Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca> Signed-off-by: David S. Miller <davem@davemloft.net>
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*
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* xfrm4_mode_transport.c - Transport mode encapsulation for IPv4.
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*
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* Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/stringify.h>
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#include <net/dst.h>
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#include <net/ip.h>
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#include <net/xfrm.h>
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/* Add encapsulation header.
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*
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* The IP header will be moved forward to make space for the encapsulation
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* header.
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*
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* On exit, skb->h will be set to the start of the payload to be processed
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* by x->type->output and skb->nh will be set to the top IP header.
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*/
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static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct iphdr *iph;
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int ihl;
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iph = skb->nh.iph;
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skb->h.ipiph = iph;
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ihl = iph->ihl * 4;
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skb->h.raw += ihl;
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skb->nh.raw = memmove(skb_push(skb, x->props.header_len), iph, ihl);
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return 0;
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}
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/* Remove encapsulation header.
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*
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* The IP header will be moved over the top of the encapsulation header.
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*
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* On entry, skb->h shall point to where the IP header should be and skb->nh
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* shall be set to where the IP header currently is. skb->data shall point
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* to the start of the payload.
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*/
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static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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int ihl = skb->data - skb->h.raw;
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if (skb->h.raw != skb->nh.raw)
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skb->nh.raw = memmove(skb->h.raw, skb->nh.raw, ihl);
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skb->nh.iph->tot_len = htons(skb->len + ihl);
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skb->h.raw = skb->data;
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return 0;
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}
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static struct xfrm_mode xfrm4_transport_mode = {
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.input = xfrm4_transport_input,
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.output = xfrm4_transport_output,
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.owner = THIS_MODULE,
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.encap = XFRM_MODE_TRANSPORT,
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};
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static int __init xfrm4_transport_init(void)
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{
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return xfrm_register_mode(&xfrm4_transport_mode, AF_INET);
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}
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static void __exit xfrm4_transport_exit(void)
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{
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int err;
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err = xfrm_unregister_mode(&xfrm4_transport_mode, AF_INET);
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BUG_ON(err);
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}
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module_init(xfrm4_transport_init);
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module_exit(xfrm4_transport_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TRANSPORT);
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