From: Andrew Yourtchenko <ayourtch@gmail.com>
Date: Mon, 26 Aug 2019 12:58:48 +0000 (+0000)
Subject: ip: ip6_preflen_to_mask incorrect result for prefix len > 64
X-Git-Tag: v19.08.1~21
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=de6faf9319216ed22abff93bf8c990241e1ff5f1;p=vpp.git

ip: ip6_preflen_to_mask incorrect result for prefix len > 64

The as_u64[0] in the result was not correctly filled in for
longer prefix lengths.

Type: fix
Fixes: 1c7104514c

Change-Id: I871772c618475396d1c1c4c699ff77e35097f07e
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
(cherry picked from commit 59ac9c23c47962fbbd935e7075ff7ee89e955847)
---

diff --git a/src/vnet/ip/ip.c b/src/vnet/ip/ip.c
index 133767bd06c..c5b43d446be 100644
--- a/src/vnet/ip/ip.c
+++ b/src/vnet/ip/ip.c
@@ -235,6 +235,7 @@ ip6_preflen_to_mask (u8 pref_len, ip6_address_t * mask)
     }
   else
     {
+      mask->as_u64[0] = 0xffffffffffffffffL;
       mask->as_u64[1] =
 	clib_host_to_net_u64 (0xffffffffffffffffL << (128 - pref_len));
     }