netdev - [PATCH iproute2] gre: Fix ttl inherit option

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Date:   Tue, 28 Nov 2017 11:16:21 +0000
From:   robertshearman@...il.com
To:     stephen@...workplumber.org, netdev@...r.kernel.org
Cc:     Robert Shearman <rs823p@....com>
Subject: [PATCH iproute2] gre: Fix ttl inherit option

From: Robert Shearman <rs823p@....com>

Specifying "... ttl inherit" currently does nothing on a GRE link
modify since the previous ttl value is retrieved up front. Fix this by
explicitly setting ttl to 0 when "inherit" is specified for the
option, since 0 represents the semantics of inherit.

Signed-off-by: Robert Shearman <rs823p@....com>
---
 ip/link_gre.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ip/link_gre.c b/ip/link_gre.c
index 35782caaa68b..43cb1af6196a 100644
--- a/ip/link_gre.c
+++ b/ip/link_gre.c
@@ -276,7 +276,8 @@ get_failed:
 				if (uval > 255)
 					invarg("TTL must be <= 255\n", *argv);
 				ttl = uval;
-			}
+			} else
+				ttl = 0;
 		} else if (!matches(*argv, "tos") ||
 			   !matches(*argv, "tclass") ||
 			   !matches(*argv, "dsfield")) {
-- 
2.1.4