xfrm6_mode_ro.rar_V2

/* Route optimization mode for IPv6. */ /* * Authors: * Noriaki TAKAMIYA @USAGI * Masahide NAKAMURA @USAGI */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/skbuff.h> #include <linux/spinlock.h> #include <linux/stringify.h> #include <linux/time.h> #include <net/ipv6.h> #include <net/xfrm.h> /* Add route optimization header space. * * The IP header and mutable extension headers will be moved forward to make * space for the route optimization header. */ static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb) { struct ipv6hdr *iph; u8 *prevhdr; int hdr_len; iph = ipv6_hdr(skb); hdr_len = x->type->hdr_offset(x, skb, &prevhdr); skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data); skb_set_network_header(skb, -x->props.header_len); skb->transport_header = skb->network_header + hdr_len; __skb_pull(skb, hdr_len); memmove(ipv6_hdr(skb), iph, hdr_len); x->lastused = get_seconds(); return 0; } static struct xfrm_mode xfrm6_ro_mode = { .output = xfrm6_ro_output, .owner = THIS_MODULE, .encap = XFRM_MODE_ROUTEOPTIMIZATION, }; static int __init xfrm6_ro_init(void) { return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6); } static void __exit xfrm6_ro_exit(void) { int err; err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6); BUG_ON(err); } module_init(xfrm6_ro_init); module_exit(xfrm6_ro_exit); MODULE_LICENSE("GPL"); MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);