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udplite: fix partial checksum initialization

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Since UDP-Lite is always using checksum, the following path is
triggered when calculating pseudo header for it:

  udp4_csum_init() or udp6_csum_init()
    skb_checksum_init_zero_check()
      __skb_checksum_validate_complete()

The problem can appear if skb->len is less than CHECKSUM_BREAK. In
this particular case __skb_checksum_validate_complete() also invokes
__skb_checksum_complete(skb). If UDP-Lite is using partial checksum
that covers only part of a packet, the function will return bad
checksum and the packet will be dropped.

It can be fixed if we skip skb_checksum_init_zero_check() and only
set the required pseudo header checksum for UDP-Lite with partial
checksum before udp4_csum_init()/udp6_csum_init() functions return.

Fixes: ed70fcfcee ("net: Call skb_checksum_init in IPv4")
Fixes: e4f45b7f40 ("net: Call skb_checksum_init in IPv6")
Signed-off-by: Alexey Kodanev <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Alexey Kodanev 2018-02-15 20:18:43 +03:00 • committed by David S. Miller
commit 15f35d49c9
3 changed files with 11 additions and 0 deletions
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5
net/ipv6/ip6_checksum.c
View file

@ -73,6 +73,11 @@ int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto)
err = udplite_checksum_init(skb, uh);
if (err)
return err;
if (UDP_SKB_CB(skb)->partial_cov) {
skb->csum = ip6_compute_pseudo(skb, proto);
return 0;
}
}
/* To support RFC 6936 (allow zero checksum in UDP/IPV6 for tunnels)