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net: warn if gso_type isn't set for a GSO SKB 

In bug report [0] a warning in r8169 driver was reported that was
caused by an invalid GSO SKB (gso_type was 0). See [1] for a discussion
about this issue. Still the origin of the invalid GSO SKB isn't clear.

It shouldn't be a network drivers task to check for invalid GSO SKB's.
Also, even if issue [0] can be fixed, we can't be sure that a
similar issue doesn't pop up again at another place.
Therefore let gso_features_check() check for such invalid GSO SKB's.

[0] https://bugzilla.kernel.org/show_bug.cgi?id=209423
[1] https://www.spinics.net/lists/netdev/msg690794.html

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/97c78d21-7f0b-d843-df17-3589f224d2cf@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Heiner Kallweit 2020-11-21 00:22:20 +01:00 committed by Jakub Kicinski
parent be419fcacf
commit 1d155dfdf5
1 changed files with 5 additions and 0 deletions
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5
net/core/dev.c
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@ -3495,6 +3495,11 @@ static netdev_features_t gso_features_check(const struct sk_buff *skb,
if (gso_segs > dev->gso_max_segs)
return features & ~NETIF_F_GSO_MASK;
if (!skb_shinfo(skb)->gso_type) {
skb_warn_bad_offload(skb);
return features & ~NETIF_F_GSO_MASK;
}
/* Support for GSO partial features requires software
* intervention before we can actually process the packets
* so we need to strip support for any partial features now