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26#include <linux/init.h>
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/skbuff.h>
30#include <linux/spinlock.h>
31#include <linux/stringify.h>
32#include <linux/time.h>
33#include <net/ipv6.h>
34#include <net/xfrm.h>
35
36
37
38
39
40
41static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
42{
43 struct ipv6hdr *iph;
44 u8 *prevhdr;
45 int hdr_len;
46
47 iph = ipv6_hdr(skb);
48
49 hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
50 skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
51 skb_set_network_header(skb, -x->props.header_len);
52 skb->transport_header = skb->network_header + hdr_len;
53 __skb_pull(skb, hdr_len);
54 memmove(ipv6_hdr(skb), iph, hdr_len);
55
56 x->lastused = get_seconds();
57
58 return 0;
59}
60
61static struct xfrm_mode xfrm6_ro_mode = {
62 .output = xfrm6_ro_output,
63 .owner = THIS_MODULE,
64 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
65};
66
67static int __init xfrm6_ro_init(void)
68{
69 return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6);
70}
71
72static void __exit xfrm6_ro_exit(void)
73{
74 int err;
75
76 err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6);
77 BUG_ON(err);
78}
79
80module_init(xfrm6_ro_init);
81module_exit(xfrm6_ro_exit);
82MODULE_LICENSE("GPL");
83MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);
84