[v2] ip_frag: recalculate data length of fragment
diff mbox series

Message ID 1606098435-15804-1-git-send-email-luyicai@huawei.com
State Superseded
Delegated to: Thomas Monjalon
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Series
  • [v2] ip_frag: recalculate data length of fragment
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Commit Message

Yicai Lu Nov. 23, 2020, 2:27 a.m. UTC
In some situations, we would get several ip fragments, which total
data length is less than minimum frame(64) and padding with zeros.
Examples: Second Fragment "a0a1 a2a3 a4a5 a6a7 0000 0000 ..."
and Third Fragment "a8a9 aaab acad aeaf b0b1 b2b3 ...".
Finally, we would reassemble Second and Third Fragment like this
"a0a1 a2a3 a4a5 a6a7 0000 0000 ... a8a9 aaab acad aeaf b0b1 ...",
which is not correct!
So, we need recalculate data length of fragment to remove padings!

Fixes: 416707812c03 ("ip_frag: refactor reassembly code into a proper library")
Cc: anatoly.burakov@intel.com

Signed-off-by: Yicai Lu <luyicai@huawei.com>
---
v1 -> v2: Adjust commit info style
---
 lib/librte_ip_frag/ip_frag_internal.c | 1 +
 1 file changed, 1 insertion(+)

Patch
diff mbox series

diff --git a/lib/librte_ip_frag/ip_frag_internal.c b/lib/librte_ip_frag/ip_frag_internal.c
index b436a4c..7bdd980 100644
--- a/lib/librte_ip_frag/ip_frag_internal.c
+++ b/lib/librte_ip_frag/ip_frag_internal.c
@@ -155,6 +155,7 @@  struct rte_mbuf *
 
 	fp->frags[idx].ofs = ofs;
 	fp->frags[idx].len = len;
+	mb->data_len = mb->l2_len + mb->l3_len + len;
 	fp->frags[idx].mb = mb;
 
 	mb = NULL;