From 4ec2079e222d641ff12c1262b8ce8011103d5ec0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adrien=20Gallou=C3=ABt?= <adrien@gallouet.fr>
Date: Tue, 2 Apr 2019 14:28:43 +0000
Subject: [PATCH] Always use size_t for MTU
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Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>
---
 src/iface.c | 9 +++++++--
 src/iface.h | 2 +-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/iface.c b/src/iface.c
index e8bdd5d..1728155 100644
--- a/src/iface.c
+++ b/src/iface.c
@@ -6,10 +6,15 @@
 #include <sys/ioctl.h>
 
 int
-iface_set_mtu(const char *dev_name, int mtu)
+iface_set_mtu(const char *dev_name, size_t mtu)
 {
+    if (mtu > (size_t)0xFFFF) {
+        errno = EINVAL;
+        return -1;
+    }
+
     struct ifreq ifr = {
-        .ifr_mtu = mtu,
+        .ifr_mtu = (int)mtu,
     };
 
     const size_t len = sizeof(ifr.ifr_name) - 1;
diff --git a/src/iface.h b/src/iface.h
index 5c8c354..6066d24 100644
--- a/src/iface.h
+++ b/src/iface.h
@@ -1,3 +1,3 @@
 #pragma once
 
-int iface_set_mtu (const char *, int);
+int iface_set_mtu (const char *, size_t);