From: faicker.mo <faicker.mo@ucloud.cn>
Date: Wed, 14 Nov 2018 08:51:34 +0000 (+0800)
Subject: ip4: don't format upper layer if it's a fragment
X-Git-Tag: v20.01-rc0~825
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=2bccb181c79f56090107b55ed2d0a551cda12643;p=vpp.git

ip4: don't format upper layer if it's a fragment

Parsing ipv4 upper layer is not meaningful
if it's a fragment packet except the first.

Change-Id: I442fb7ec01244fde8c4f7656a8ba633d0aa0f97e
Signed-off-by: Faicker Mo <faicker.mo@ucloud.cn>
---

diff --git a/src/vnet/ip/ip4_format.c b/src/vnet/ip/ip4_format.c
index 5399e44d93a..6c31b422225 100644
--- a/src/vnet/ip/ip4_format.c
+++ b/src/vnet/ip/ip4_format.c
@@ -178,6 +178,9 @@ format_ip4_header (u8 * s, va_list * args)
 	_(CONGESTION);
 #undef _
       }
+    /* Fragment packet but not the first. */
+    if (o != 0)
+      return s;
   }
 
   /* Recurse into next protocol layer. */