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authorHerbert Xu <herbert@gondor.apana.org.au>2007-10-09 04:16:30 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-11 03:54:53 +0400
commit406ef77c893ebd882209be4e393d64b01fe72054 (patch)
tree815d753889769b355fba7e648abef7ad1422559e /net/xfrm/xfrm_output.c
parentbc31d3b2c7d7f2a03721a05cb3c9a3ce8b1e2e5a (diff)
downloadlinux-406ef77c893ebd882209be4e393d64b01fe72054.tar.xz
[IPSEC]: Move common output code to xfrm_output
Most of the code in xfrm4_output_one and xfrm6_output_one are identical so this patch moves them into a common xfrm_output function which will live in net/xfrm. In fact this would seem to fix a bug as on IPv4 we never reset the network header after a transform which may upset netfilter later on. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm/xfrm_output.c')
-rw-r--r--net/xfrm/xfrm_output.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
new file mode 100644
index 000000000000..75f289b488a7
--- /dev/null
+++ b/net/xfrm/xfrm_output.c
@@ -0,0 +1,73 @@
+/*
+ * xfrm_output.c - Common IPsec encapsulation code.
+ *
+ * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/time.h>
+#include <net/dst.h>
+#include <net/xfrm.h>
+
+int xfrm_output(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb->dst;
+ struct xfrm_state *x = dst->xfrm;
+ int err;
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ err = skb_checksum_help(skb);
+ if (err)
+ goto error_nolock;
+ }
+
+ do {
+ spin_lock_bh(&x->lock);
+ err = xfrm_state_check(x, skb);
+ if (err)
+ goto error;
+
+ err = x->mode->output(x, skb);
+ if (err)
+ goto error;
+
+ err = x->type->output(x, skb);
+ if (err)
+ goto error;
+
+ x->curlft.bytes += skb->len;
+ x->curlft.packets++;
+
+ if (x->props.mode == XFRM_MODE_ROUTEOPTIMIZATION)
+ x->lastused = get_seconds();
+
+ spin_unlock_bh(&x->lock);
+
+ skb_reset_network_header(skb);
+
+ if (!(skb->dst = dst_pop(dst))) {
+ err = -EHOSTUNREACH;
+ goto error_nolock;
+ }
+ dst = skb->dst;
+ x = dst->xfrm;
+ } while (x && (x->props.mode != XFRM_MODE_TUNNEL));
+
+ err = 0;
+
+error_nolock:
+ return err;
+error:
+ spin_unlock_bh(&x->lock);
+ goto error_nolock;
+}
+EXPORT_SYMBOL_GPL(xfrm_output);