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d26f398400
Currently x->lastused is u64 which means that it cannot be read/written atomically on all architectures. David Miller observed that the value stored in it is only an unsigned long which is always atomic. So based on his suggestion this patch changes the internal representation from u64 to unsigned long while the user-interface still refers to it as u64. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/*
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* xfrm6_mode_ro.c - Route optimization mode for IPv6.
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*
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* Copyright (C)2003-2006 Helsinki University of Technology
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* Copyright (C)2003-2006 USAGI/WIDE Project
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Authors:
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* Noriaki TAKAMIYA @USAGI
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* Masahide NAKAMURA @USAGI
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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/spinlock.h>
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#include <linux/stringify.h>
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#include <linux/time.h>
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#include <net/ipv6.h>
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#include <net/xfrm.h>
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/* Add route optimization header space.
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*
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* The IP header and mutable extension headers will be moved forward to make
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* space for the route optimization header.
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*/
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static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ipv6hdr *iph;
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u8 *prevhdr;
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int hdr_len;
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iph = ipv6_hdr(skb);
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hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
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skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
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skb_set_network_header(skb, -x->props.header_len);
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skb->transport_header = skb->network_header + hdr_len;
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__skb_pull(skb, hdr_len);
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memmove(ipv6_hdr(skb), iph, hdr_len);
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x->lastused = get_seconds();
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return 0;
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}
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static struct xfrm_mode xfrm6_ro_mode = {
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.output = xfrm6_ro_output,
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.owner = THIS_MODULE,
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.encap = XFRM_MODE_ROUTEOPTIMIZATION,
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};
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static int __init xfrm6_ro_init(void)
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{
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return xfrm_register_mode(&xfrm6_ro_mode, AF_INET6);
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}
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static void __exit xfrm6_ro_exit(void)
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{
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int err;
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err = xfrm_unregister_mode(&xfrm6_ro_mode, AF_INET6);
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BUG_ON(err);
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}
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module_init(xfrm6_ro_init);
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module_exit(xfrm6_ro_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_ROUTEOPTIMIZATION);
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