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[IPSEC]: Move state lock into x->type->input

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This patch releases the lock on the state before calling
x->type->input.  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@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2007-11-13 21:45:58 -08:00
committed by David S. Miller
parent 668dc8af31
commit 0ebea8ef35
6 changed files with 77 additions and 41 deletions
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53
net/ipv6/esp6.c
View File

@ -165,23 +165,6 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
goto out;
}
/* If integrity check is required, do this. */
if (esp->auth.icv_full_len) {
u8 sum[alen];
ret = esp_mac_digest(esp, skb, 0, skb->len - alen);
if (ret)
goto out;
if (skb_copy_bits(skb, skb->len - alen, sum, alen))
BUG();
if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) {
ret = -EBADMSG;
goto out;
}
}
if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) {
ret = -EINVAL;
goto out;
@ -189,6 +172,25 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
skb->ip_summed = CHECKSUM_NONE;
spin_lock(&x->lock);
/* If integrity check is required, do this. */
if (esp->auth.icv_full_len) {
u8 sum[alen];
ret = esp_mac_digest(esp, skb, 0, skb->len - alen);
if (ret)
goto unlock;
if (skb_copy_bits(skb, skb->len - alen, sum, alen))
BUG();
if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) {
ret = -EBADMSG;
goto unlock;
}
}
esph = (struct ip_esp_hdr *)skb->data;
iph = ipv6_hdr(skb);
@ -197,15 +199,13 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen);
{
u8 nexthdr[2];
struct scatterlist *sg = &esp->sgbuf[0];
u8 padlen;
if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
if (!sg) {
ret = -ENOMEM;
goto out;
goto unlock;
}
}
sg_init_table(sg, nfrags);
@ -215,8 +215,17 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
ret = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
if (unlikely(sg != &esp->sgbuf[0]))
kfree(sg);
if (unlikely(ret))
goto out;
}
unlock:
spin_unlock(&x->lock);
if (unlikely(ret))
goto out;
{
u8 nexthdr[2];
u8 padlen;
if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
BUG();