[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@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

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;

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:

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) {

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;
 }

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;
 }

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;