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Date: Tue, 09 Oct 2007 22:36:37 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 7/7] [IPSEC]: Move state lock into x->type->output
[IPSEC]: Move state lock into x->type->output
This patch releases the lock on the state before calling x->type->output.
It also adds the lock to the spots where they're currently needed.
Most of those places (all except mip6) are expected to disappear with
async crypto.
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
---
net/ipv4/ah4.c | 7 ++++++-
net/ipv4/esp4.c | 10 ++++++++--
net/ipv6/ah6.c | 9 ++++++---
net/ipv6/esp6.c | 10 ++++++++--
net/ipv6/mip6.c | 4 ++++
net/xfrm/xfrm_output.c | 8 ++++----
6 files changed, 36 insertions(+), 12 deletions(-)
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index 58af298..3513149 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -5,6 +5,7 @@
#include <net/ah.h>
#include <linux/crypto.h>
#include <linux/pfkeyv2.h>
+#include <linux/spinlock.h>
#include <net/icmp.h>
#include <net/protocol.h>
#include <asm/scatterlist.h>
@@ -97,10 +98,14 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
ah->reserved = 0;
ah->spi = x->id.spi;
ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq);
+
+ spin_lock_bh(&x->lock);
err = ah_mac_digest(ahp, skb, ah->auth_data);
+ memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len);
+ spin_unlock_bh(&x->lock);
+
if (err)
goto error;
- memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len);
top_iph->tos = iph->tos;
top_iph->ttl = iph->ttl;
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index ffd5653..452910d 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -8,6 +8,7 @@
#include <linux/kernel.h>
#include <linux/pfkeyv2.h>
#include <linux/random.h>
+#include <linux/spinlock.h>
#include <net/icmp.h>
#include <net/protocol.h>
#include <net/udp.h>
@@ -66,6 +67,8 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
top_iph->tot_len = htons(skb->len + alen);
*(skb_tail_pointer(trailer) - 1) = top_iph->protocol;
+ spin_lock_bh(&x->lock);
+
/* this is non-NULL only with UDP Encapsulation */
if (x->encap) {
struct xfrm_encap_tmpl *encap = x->encap;
@@ -111,7 +114,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
if (!sg)
- goto error;
+ goto unlock;
}
skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
err = crypto_blkcipher_encrypt(&desc, sg, sg, clen);
@@ -120,7 +123,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
} while (0);
if (unlikely(err))
- goto error;
+ goto unlock;
if (esp->conf.ivlen) {
memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen);
@@ -133,6 +136,9 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen);
}
+unlock:
+ spin_unlock_bh(&x->lock);
+
ip_send_check(top_iph);
error:
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index ff904a7..c51d775 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -29,6 +29,7 @@
#include <net/ah.h>
#include <linux/crypto.h>
#include <linux/pfkeyv2.h>
+#include <linux/spinlock.h>
#include <linux/string.h>
#include <net/icmp.h>
#include <net/ipv6.h>
@@ -284,12 +285,14 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
ah->reserved = 0;
ah->spi = x->id.spi;
ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq);
+
+ spin_lock_bh(&x->lock);
err = ah_mac_digest(ahp, skb, ah->auth_data);
- if (err)
- goto error_free_iph;
memcpy(ah->auth_data, ahp->work_icv, ahp->icv_trunc_len);
+ spin_unlock_bh(&x->lock);
- err = 0;
+ if (err)
+ goto error_free_iph;
memcpy(top_iph, tmp_base, sizeof(tmp_base));
if (tmp_ext) {
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 9fc1940..7355bb0 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -34,6 +34,7 @@
#include <linux/kernel.h>
#include <linux/pfkeyv2.h>
#include <linux/random.h>
+#include <linux/spinlock.h>
#include <net/icmp.h>
#include <net/ipv6.h>
#include <net/protocol.h>
@@ -98,6 +99,8 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
esph->spi = x->id.spi;
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq);
+ spin_lock_bh(&x->lock);
+
if (esp->conf.ivlen) {
if (unlikely(!esp->conf.ivinitted)) {
get_random_bytes(esp->conf.ivec, esp->conf.ivlen);
@@ -112,7 +115,7 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
if (!sg)
- goto error;
+ goto unlock;
}
skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
err = crypto_blkcipher_encrypt(&desc, sg, sg, clen);
@@ -121,7 +124,7 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
} while (0);
if (unlikely(err))
- goto error;
+ goto unlock;
if (esp->conf.ivlen) {
memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen);
@@ -134,6 +137,9 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen);
}
+unlock:
+ spin_unlock_bh(&x->lock);
+
error:
return err;
}
diff --git a/net/ipv6/mip6.c b/net/ipv6/mip6.c
index 7261c29..6475bac 100644
--- a/net/ipv6/mip6.c
+++ b/net/ipv6/mip6.c
@@ -172,7 +172,9 @@ static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb)
len = ((char *)hao - (char *)dstopt) + sizeof(*hao);
memcpy(&hao->addr, &iph->saddr, sizeof(hao->addr));
+ spin_lock_bh(&x->lock);
memcpy(&iph->saddr, x->coaddr, sizeof(iph->saddr));
+ spin_unlock_bh(&x->lock);
BUG_TRAP(len == x->props.header_len);
dstopt->hdrlen = (x->props.header_len >> 3) - 1;
@@ -381,7 +383,9 @@ static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb)
BUG_TRAP(rt2->rt_hdr.hdrlen == 2);
memcpy(&rt2->addr, &iph->daddr, sizeof(rt2->addr));
+ spin_lock_bh(&x->lock);
memcpy(&iph->daddr, x->coaddr, sizeof(iph->daddr));
+ spin_unlock_bh(&x->lock);
return 0;
}
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 9847bae..0eb3377 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -67,15 +67,15 @@ int xfrm_output(struct sk_buff *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);
+ err = x->type->output(x, skb);
+ if (err)
+ goto error_nolock;
+
if (!(skb->dst = dst_pop(dst))) {
err = -EHOSTUNREACH;
goto error_nolock;
-
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