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| author | Alexey Kodanev <alexey.kodanev@oracle.com> | 2018-02-15 20:18:43 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-02-16 15:57:42 -0500 |
| commit | 15f35d49c93f4fa9875235e7bf3e3783d2dd7a1b (patch) | |
| tree | 2d100c2307313118f62ae83634a3f23046fa1a90 /include/net/udplite.h | |
| parent | da27988766e338e4a4fe198170497c0920395d4c (diff) | |
| download | lwn-15f35d49c93f4fa9875235e7bf3e3783d2dd7a1b.tar.gz lwn-15f35d49c93f4fa9875235e7bf3e3783d2dd7a1b.zip | |
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>
Diffstat (limited to 'include/net/udplite.h')
| -rw-r--r-- | include/net/udplite.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/udplite.h b/include/net/udplite.h index 81bdbf97319b..9185e45b997f 100644 --- a/include/net/udplite.h +++ b/include/net/udplite.h @@ -64,6 +64,7 @@ static inline int udplite_checksum_init(struct sk_buff *skb, struct udphdr *uh) UDP_SKB_CB(skb)->cscov = cscov; if (skb->ip_summed == CHECKSUM_COMPLETE) skb->ip_summed = CHECKSUM_NONE; + skb->csum_valid = 0; } return 0; |