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net: checksum: Skip fragmented IP packets

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To calculate the TCP/UDP checksum we need the whole datagram. Unless
the hardware has some logic to collect all fragments before sending
the whole datagram first, it can only be done by the network stack,
which is normally the case for the NICs we have seen so far.

Skip these fragmented IP packets to avoid checksum corruption.

Signed-off-by: Markus Carlstedt <markus.carlstedt@windriver.com>
Signed-off-by: Bin Meng <bin.meng@windriver.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Markus Carlstedt 2020-12-11 17:35:10 +08:00 committed by Jason Wang
parent 831734cce6
commit 0dcf0c0aee
1 changed files with 4 additions and 0 deletions
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4
net/checksum.c
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@ -106,6 +106,10 @@ void net_checksum_calculate(uint8_t *data, int length)
return; /* not IPv4 */ return; /* not IPv4 */
} }
if (IP4_IS_FRAGMENT(ip)) {
return; /* a fragmented IP packet */
}
ip_len = lduw_be_p(&ip->ip_len); ip_len = lduw_be_p(&ip->ip_len);
/* Last, check that we have enough data for the all IP frame */ /* Last, check that we have enough data for the all IP frame */