2 * xfrm_output.c - Common IPsec encapsulation code.
4 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/netdevice.h>
15 #include <linux/skbuff.h>
16 #include <linux/spinlock.h>
17 #include <linux/time.h>
21 int xfrm_output(struct sk_buff *skb)
23 struct dst_entry *dst = skb->dst;
24 struct xfrm_state *x = dst->xfrm;
27 if (skb->ip_summed == CHECKSUM_PARTIAL) {
28 err = skb_checksum_help(skb);
34 spin_lock_bh(&x->lock);
35 err = xfrm_state_check(x, skb);
39 err = x->mode->output(x, skb);
43 err = x->type->output(x, skb);
47 x->curlft.bytes += skb->len;
50 if (x->props.mode == XFRM_MODE_ROUTEOPTIMIZATION)
51 x->lastused = get_seconds();
53 spin_unlock_bh(&x->lock);
55 skb_reset_network_header(skb);
57 if (!(skb->dst = dst_pop(dst))) {
63 } while (x && (x->props.mode != XFRM_MODE_TUNNEL));
70 spin_unlock_bh(&x->lock);
73 EXPORT_SYMBOL_GPL(xfrm_output);