74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
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/*
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* xfrm_output.c - Common IPsec encapsulation code.
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*
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* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/time.h>
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#include <net/dst.h>
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#include <net/xfrm.h>
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int xfrm_output(struct sk_buff *skb)
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{
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struct dst_entry *dst = skb->dst;
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struct xfrm_state *x = dst->xfrm;
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int err;
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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err = skb_checksum_help(skb);
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if (err)
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goto error_nolock;
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}
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do {
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spin_lock_bh(&x->lock);
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err = xfrm_state_check(x, skb);
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if (err)
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goto error;
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err = x->mode->output(x, skb);
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if (err)
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goto error;
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err = x->type->output(x, skb);
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if (err)
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goto error;
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x->curlft.bytes += skb->len;
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x->curlft.packets++;
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if (x->props.mode == XFRM_MODE_ROUTEOPTIMIZATION)
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x->lastused = get_seconds();
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spin_unlock_bh(&x->lock);
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skb_reset_network_header(skb);
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if (!(skb->dst = dst_pop(dst))) {
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err = -EHOSTUNREACH;
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goto error_nolock;
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}
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dst = skb->dst;
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x = dst->xfrm;
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} while (x && (x->props.mode != XFRM_MODE_TUNNEL));
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err = 0;
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error_nolock:
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return err;
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error:
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spin_unlock_bh(&x->lock);
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goto error_nolock;
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}
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EXPORT_SYMBOL_GPL(xfrm_output);
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