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qemu/0030-net-Warn-about-default-MAC-address.patch

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From 1a709119c593c74fb7db745030a0dda33e7dd18c Mon Sep 17 00:00:00 2001
From: Alexander Graf <agraf@suse.de>
Date: Wed, 12 Dec 2012 19:11:31 +0100
Subject: [PATCH] net: Warn about default MAC address
[AF: Suppress for QTest]
---
net/net.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/net/net.c b/net/net.c
index 0be084d..552e233 100644
--- a/net/net.c
+++ b/net/net.c
@@ -42,6 +42,7 @@
#include "qapi/opts-visitor.h"
#include "qapi/dealloc-visitor.h"
#include "sysemu/sysemu.h"
+#include "sysemu/qtest.h"
/* Net bridge is currently not supported for W32. */
#if !defined(_WIN32)
@@ -160,6 +161,28 @@ void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
macaddr[3], macaddr[4], macaddr[5]);
}
+static void default_mac_check(void)
+{
+ static const MACAddr def_mac = { .a = { 0x52,0x54,0x00,0x12,0x34,0x56 } };
+ static int warned = 0;
+ int i;
+
+ for (i = 0; i < MAX_NICS; i++) {
+ if (!nd_table[i].used) {
+ continue;
+ }
+ if (memcmp(nd_table[i].macaddr.a, def_mac.a, 5)) {
+ continue;
+ }
+ if (nd_table[i].macaddr.a[5] >= 0x56 &&
+ nd_table[i].macaddr.a[5] < 0x56 + MAX_NICS && !warned && !qtest_enabled()) {
+ warned = 1;
+ fprintf(stderr, "Warning: default mac address being used, creating "
+ "potential for address conflict\n");
+ }
+ }
+}
+
void qemu_macaddr_default_if_unset(MACAddr *macaddr)
{
static int index = 0;
@@ -1313,6 +1336,7 @@ int net_init_clients(void)
if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
return -1;
}
+ default_mac_check();
return 0;
}