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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 /net/ipv4/udp.c | |
| parent | skbuff: Fix comment mis-spelling. (diff) | |
| download | linux-dev-15f35d49c93f4fa9875235e7bf3e3783d2dd7a1b.tar.xz linux-dev-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 'net/ipv4/udp.c')
| -rw-r--r-- | net/ipv4/udp.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index bfaefe560b5c..e5ef7c38c934 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -2024,6 +2024,11 @@ static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, err = udplite_checksum_init(skb, uh); if (err) return err; + + if (UDP_SKB_CB(skb)->partial_cov) { + skb->csum = inet_compute_pseudo(skb, proto); + return 0; + } } /* Note, we are only interested in != 0 or == 0, thus the |