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[RESEND PULL 2/4] net: checksum: Skip fragmented IP packets

From: Jason Wang
Subject: [RESEND PULL 2/4] net: checksum: Skip fragmented IP packets
Date: Mon, 25 Jan 2021 20:23:05 +0800

From: Markus Carlstedt <markus.carlstedt@windriver.com>

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>
 net/checksum.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/checksum.c b/net/checksum.c
index aaa4000..5cb8b2c 100644
--- a/net/checksum.c
+++ b/net/checksum.c
@@ -106,6 +106,10 @@ void net_checksum_calculate(uint8_t *data, int length)
         return; /* not IPv4 */
+    if (IP4_IS_FRAGMENT(ip)) {
+        return; /* a fragmented IP packet */
+    }
     ip_len = lduw_be_p(&ip->ip_len);
     /* Last, check that we have enough data for the all IP frame */

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