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gso: Only allow GSO_PARTIAL if we can checksum the inner protocol 

This patch addresses a possible issue that can occur if we get into any odd
corner cases where we support TSO for a given protocol but not the checksum
or scatter-gather offload.  There are few drivers floating around that
setup their tunnels this way and by enforcing the checksum piece we can
avoid mangling any frames.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2016-05-02 09:38:18 -07:00 committed by David S. Miller
parent d7fb5a8049
commit 36c983824b
1 changed files with 3 additions and 3 deletions
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6
net/core/skbuff.c
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@ -3080,8 +3080,7 @@ struct sk_buff *skb_segment(struct sk_buff *head_skb,
unsigned int headroom; unsigned int headroom;
unsigned int len = head_skb->len; unsigned int len = head_skb->len;
__be16 proto; __be16 proto;
bool csum; bool csum, sg;
int sg = !!(features & NETIF_F_SG);
int nfrags = skb_shinfo(head_skb)->nr_frags; int nfrags = skb_shinfo(head_skb)->nr_frags;
int err = -ENOMEM; int err = -ENOMEM;
int i = 0; int i = 0;
@ -3093,13 +3092,14 @@ struct sk_buff *skb_segment(struct sk_buff *head_skb,
if (unlikely(!proto)) if (unlikely(!proto))
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
sg = !!(features & NETIF_F_SG);
csum = !!can_checksum_protocol(features, proto); csum = !!can_checksum_protocol(features, proto);
/* GSO partial only requires that we trim off any excess that /* GSO partial only requires that we trim off any excess that
* doesn't fit into an MSS sized block, so take care of that * doesn't fit into an MSS sized block, so take care of that
* now. * now.
*/ */
if (features & NETIF_F_GSO_PARTIAL) { if (sg && csum && (features & NETIF_F_GSO_PARTIAL)) {
partial_segs = len / mss; partial_segs = len / mss;
if (partial_segs > 1) if (partial_segs > 1)
mss *= partial_segs; mss *= partial_segs;