diff mbox

core, nfqueue, openvswitch: Orphan frags in skb_zerocopy and handle errors

Message ID 1395261516-305-1-git-send-email-zoltan.kiss@citrix.com (mailing list archive)
State New, archived
Headers show

Commit Message

Zoltan Kiss March 19, 2014, 8:38 p.m. UTC 
skb_zerocopy can copy elements of the frags array between skbs, but it doesn't
orphan them. Also, it doesn't handle errors, so this patch takes care of that
as well.

Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
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Comments

Thomas Graf March 19, 2014, 8:47 p.m. UTC | #1 
On 03/19/2014 09:38 PM, Zoltan Kiss wrote:
> skb_zerocopy can copy elements of the frags array between skbs, but it doesn't
> orphan them. Also, it doesn't handle errors, so this patch takes care of that
> as well.
>
> Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
> ---

> +	if (unlikely(skb_orphan_frags(to, GFP_ATOMIC))) {
> +		skb_tx_error(to);
> +		return -ENOMEM;
>   	}

I think you should move this down to right before we iterate over the
frags.

Looks good otherwise.
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Zoltan Kiss March 19, 2014, 9:07 p.m. UTC | #2 
On 19/03/14 20:47, Thomas Graf wrote:
> On 03/19/2014 09:38 PM, Zoltan Kiss wrote:
>> skb_zerocopy can copy elements of the frags array between skbs, but it
>> doesn't
>> orphan them. Also, it doesn't handle errors, so this patch takes care
>> of that
>> as well.
>>
>> Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
>> ---
>
>> +    if (unlikely(skb_orphan_frags(to, GFP_ATOMIC))) {
>> +        skb_tx_error(to);
>> +        return -ENOMEM;
>>       }
>
> I think you should move this down to right before we iterate over the
> frags.

I agree, I was mislead by that __skb_fill_page_desc, but now I see it is 
actually the head buffer of the source, not a frag from there. And in 
case of a failure in skb_copy_bits we can spare an orphan_frag.

Zoli

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diff mbox

Patch

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 03db95a..35c4e85 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2508,8 +2508,8 @@  int skb_splice_bits(struct sk_buff *skb, unsigned int offset,
 		    unsigned int flags);
 void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to);
 unsigned int skb_zerocopy_headlen(const struct sk_buff *from);
-void skb_zerocopy(struct sk_buff *to, const struct sk_buff *from,
-		  int len, int hlen);
+int skb_zerocopy(struct sk_buff *to, const struct sk_buff *from,
+		 int len, int hlen);
 void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len);
 int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen);
 void skb_scrub_packet(struct sk_buff *skb, bool xnet);
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 3f14c63..60f623c 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2127,25 +2127,36 @@  EXPORT_SYMBOL_GPL(skb_zerocopy_headlen);
  *
  *	The `hlen` as calculated by skb_zerocopy_headlen() specifies the
  *	headroom in the `to` buffer.
+ *
+ *	Return value:
+ *	0: everything is OK
+ *	-ENOMEM: couldn't orphan frags of from due to lack of memory
+ *	-EFAULT: skb_copy_bits() found some problem with geometry
  */
-void
+int
 skb_zerocopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen)
 {
 	int i, j = 0;
 	int plen = 0; /* length of skb->head fragment */
+	int ret;
 	struct page *page;
 	unsigned int offset;
 
 	BUG_ON(!from->head_frag && !hlen);
 
 	/* dont bother with small payloads */
-	if (len <= skb_tailroom(to)) {
-		skb_copy_bits(from, 0, skb_put(to, len), len);
-		return;
+	if (len <= skb_tailroom(to))
+		return skb_copy_bits(from, 0, skb_put(to, len), len);
+
+	if (unlikely(skb_orphan_frags(to, GFP_ATOMIC))) {
+		skb_tx_error(to);
+		return -ENOMEM;
 	}
 
 	if (hlen) {
-		skb_copy_bits(from, 0, skb_put(to, hlen), hlen);
+		ret = skb_copy_bits(from, 0, skb_put(to, hlen), hlen);
+		if (unlikely(ret))
+			return ret;
 		len -= hlen;
 	} else {
 		plen = min_t(int, skb_headlen(from), len);
@@ -2173,6 +2184,8 @@  skb_zerocopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen)
 		j++;
 	}
 	skb_shinfo(to)->nr_frags = j;
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(skb_zerocopy);
 
diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c
index f072fe8..ea02d16 100644
--- a/net/netfilter/nfnetlink_queue_core.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -488,7 +488,8 @@  nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
 		nla->nla_type = NFQA_PAYLOAD;
 		nla->nla_len = nla_attr_size(data_len);
 
-		skb_zerocopy(skb, entskb, data_len, hlen);
+		if (skb_zerocopy(skb, entskb, data_len, hlen))
+			goto nla_put_failure;
 	}
 
 	nlh->nlmsg_len = skb->len;
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index c53fe0c..9a9f668 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -464,7 +464,9 @@  static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
 	}
 	nla->nla_len = nla_attr_size(skb->len);
 
-	skb_zerocopy(user_skb, skb, skb->len, hlen);
+	err = skb_zerocopy(user_skb, skb, skb->len, hlen);
+	if (err)
+		goto out;
 
 	/* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
 	if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {