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authorHerbert Xu <herbert@gondor.apana.org.au>2007-12-16 15:55:02 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:53:51 -0800
commit668dc8af3150f837f7f0461001bbbc0ce25d7bdf (patch)
tree9ba3534a190bb69b3aebf24aaa4340685fe16539 /net
parentb2aa5e9d43a38dcdfa0878ed750cf32f98460278 (diff)
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[IPSEC]: Move integrity stat collection into xfrm_input
Similar to the moving out of the replay processing on the output, this patch moves the integrity stat collectin from x->type->input into xfrm_input. This would eventually allow transforms such as AH/ESP to be lockless. The error value EBADMSG (currently unused in the crypto layer) is used to indicate a failed integrity check. In future this error can be directly returned by the crypto layer once we switch to aead algorithms. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ah4.c3
-rw-r--r--net/ipv4/esp4.c13
-rw-r--r--net/ipv6/ah6.c3
-rw-r--r--net/ipv6/esp6.c3
-rw-r--r--net/xfrm/xfrm_input.c5
5 files changed, 15 insertions, 12 deletions
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index 5fc346d8b56..a989d29b44e 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -177,9 +177,8 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
err = ah_mac_digest(ahp, skb, ah->auth_data);
if (err)
goto out;
- err = -EINVAL;
if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len)) {
- x->stats.integrity_failed++;
+ err = -EBADMSG;
goto out;
}
}
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 1738113268b..3350a7d5066 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -163,7 +163,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
u8 nexthdr[2];
struct scatterlist *sg;
int padlen;
- int err;
+ int err = -EINVAL;
if (!pskb_may_pull(skb, sizeof(*esph)))
goto out;
@@ -183,13 +183,14 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
BUG();
if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) {
- x->stats.integrity_failed++;
+ err = -EBADMSG;
goto out;
}
}
- if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0)
+ if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
goto out;
+ nfrags = err;
skb->ip_summed = CHECKSUM_NONE;
@@ -202,6 +203,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
sg = &esp->sgbuf[0];
if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
+ err = -ENOMEM;
sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
if (!sg)
goto out;
@@ -214,11 +216,12 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
if (unlikely(sg != &esp->sgbuf[0]))
kfree(sg);
if (unlikely(err))
- return err;
+ goto out;
if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
BUG();
+ err = -EINVAL;
padlen = nexthdr[0];
if (padlen+2 >= elen)
goto out;
@@ -276,7 +279,7 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
return nexthdr[1];
out:
- return -EINVAL;
+ return err;
}
static u32 esp4_get_mtu(struct xfrm_state *x, int mtu)
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 4eaf55072b1..d4b59ecb0b5 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -379,10 +379,9 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
err = ah_mac_digest(ahp, skb, ah->auth_data);
if (err)
goto free_out;
- err = -EINVAL;
if (memcmp(ahp->work_icv, auth_data, ahp->icv_trunc_len)) {
LIMIT_NETDEBUG(KERN_WARNING "ipsec ah authentication error\n");
- x->stats.integrity_failed++;
+ err = -EBADMSG;
goto free_out;
}
}
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 44405325467..096974ba642 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -177,8 +177,7 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
BUG();
if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) {
- x->stats.integrity_failed++;
- ret = -EINVAL;
+ ret = -EBADMSG;
goto out;
}
}
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 587f3474ed3..b7d68eb9434 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -147,8 +147,11 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
goto drop_unlock;
nexthdr = x->type->input(x, skb);
- if (nexthdr <= 0)
+ if (nexthdr <= 0) {
+ if (nexthdr == -EBADMSG)
+ x->stats.integrity_failed++;
goto drop_unlock;
+ }
skb_network_header(skb)[nhoff] = nexthdr;