Alexey Kodanev 15f35d49c9 udplite: fix partial checksum initialization
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: ed70fcfcee95 ("net: Call skb_checksum_init in IPv4")
Fixes: e4f45b7f40bd ("net: Call skb_checksum_init in IPv6")
Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16 15:57:42 -05:00
..
2017-07-11 06:08:58 -04:00
2018-01-19 14:02:12 -05:00
2017-11-27 16:20:04 -05:00
2017-04-05 10:15:20 +02:00
2018-02-06 11:32:48 -05:00
2017-10-11 09:49:34 +02:00
2017-11-16 10:49:00 +09:00
2017-12-11 14:10:06 -05:00
2017-12-15 12:34:00 -05:00
2017-09-29 06:19:32 +01:00
2016-10-03 02:00:22 -04:00
2017-11-08 16:12:33 +09:00
2017-12-05 14:37:13 -05:00
2018-01-24 19:13:45 -05:00
2017-12-04 11:32:53 -05:00
2017-11-27 16:20:04 -05:00
2018-01-17 16:07:24 -05:00