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From: bugzilla@dpdk.org
To: dev@dpdk.org
Subject: [Bug 1087] [Bug] tcp data len is incorrectly calculated in
 gro_tcp4_reassemble function
Date: Thu, 29 Sep 2022 01:40:26 +0000
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https://bugs.dpdk.org/show_bug.cgi?id=1087

            Bug ID: 1087
           Summary: [Bug] tcp data len is incorrectly calculated in
                    gro_tcp4_reassemble function
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: other
          Assignee: dev@dpdk.org
          Reporter: 853048484@qq.com
  Target Milestone: ---

Hello:
In gro_tcp4_reassemble function, tcp data len is calculated:
tcp_dl = pkt->pkt_len - hdr_len;
https://github.com/DPDK/dpdk/blob/v22.07/lib/gro/gro_tcp4.c#L232

if packets < 60 bytes, pkt_len will contain padding bytes, tcp_dl is
incorrectly calculated. this will result the wrong data length after gro.

diff --git a/lib/gro/gro_tcp4.c b/lib/gro/gro_tcp4.c index
7498c66141..cbba9fed5e 100644
--- a/lib/gro/gro_tcp4.c
+++ b/lib/gro/gro_tcp4.c
@@ -229,7 +229,7 @@ gro_tcp4_reassemble(struct rte_mbuf *pkt,
         * Don't process the packet whose payload length is less than or
         * equal to 0.
         */
-       tcp_dl = pkt->pkt_len - hdr_len;
+       tcp_dl = rte_be_to_cpu_16(ipv4_hdr->total_length) - hdr_len;
        if (tcp_dl <= 0)
                return -1;