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Date: Mon, 08 Oct 2007 19:29:39 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH 3/7] [IPSEC]: Move common output code to xfrm_output
[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@...dor.apana.org.au>
---
include/net/xfrm.h | 1
net/ipv4/xfrm4_output.c | 40 ++------------------------
net/ipv6/xfrm6_output.c | 45 +++--------------------------
net/xfrm/Makefile | 2 -
net/xfrm/xfrm_output.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 84 insertions(+), 77 deletions(-)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 760d243..f5147dd 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1016,6 +1016,7 @@ extern void xfrm_replay_notify(struct xfrm_state *x, int event);
extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
extern int xfrm_init_state(struct xfrm_state *x);
+extern int xfrm_output(struct sk_buff *skb);
extern int xfrm4_rcv(struct sk_buff *skb);
extern int xfrm4_output(struct sk_buff *skb);
extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index 44ef208..04805c7 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -12,7 +12,6 @@
#include <linux/if_ether.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
-#include <linux/spinlock.h>
#include <linux/netfilter_ipv4.h>
#include <net/ip.h>
#include <net/xfrm.h>
@@ -41,58 +40,27 @@ out:
return ret;
}
-static int xfrm4_output_one(struct sk_buff *skb)
+static inline int xfrm4_output_one(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;
- }
-
if (x->props.mode == XFRM_MODE_TUNNEL) {
err = xfrm4_tunnel_check_size(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++;
-
- spin_unlock_bh(&x->lock);
-
- 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 = xfrm_output(skb);
+ if (err)
+ goto error_nolock;
IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
err = 0;
out_exit:
return err;
-error:
- spin_unlock_bh(&x->lock);
error_nolock:
kfree_skb(skb);
goto out_exit;
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index 56364a5..f21596f 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -9,9 +9,9 @@
* 2 of the License, or (at your option) any later version.
*/
+#include <linux/if_ether.h>
#include <linux/compiler.h>
#include <linux/skbuff.h>
-#include <linux/spinlock.h>
#include <linux/icmpv6.h>
#include <linux/netfilter_ipv6.h>
#include <net/ipv6.h>
@@ -43,62 +43,27 @@ static int xfrm6_tunnel_check_size(struct sk_buff *skb)
return ret;
}
-static int xfrm6_output_one(struct sk_buff *skb)
+static inline int xfrm6_output_one(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;
- }
-
if (x->props.mode == XFRM_MODE_TUNNEL) {
err = xfrm6_tunnel_check_size(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 = xfrm_output(skb);
+ if (err)
+ goto error_nolock;
IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
err = 0;
out_exit:
return err;
-error:
- spin_unlock_bh(&x->lock);
error_nolock:
kfree_skb(skb);
goto out_exit;
diff --git a/net/xfrm/Makefile b/net/xfrm/Makefile
index de3c1a6..45744a3 100644
--- a/net/xfrm/Makefile
+++ b/net/xfrm/Makefile
@@ -3,6 +3,6 @@
#
obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_hash.o \
- xfrm_input.o xfrm_algo.o
+ xfrm_input.o xfrm_output.o xfrm_algo.o
obj-$(CONFIG_XFRM_USER) += xfrm_user.o
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
new file mode 100644
index 0000000..75f289b
--- /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@...dor.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);
-
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