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[Qemu-devel] [PATCH 1/2] avoid to allcate used macaddr to to new nic
From: |
Amos Kong |
Subject: |
[Qemu-devel] [PATCH 1/2] avoid to allcate used macaddr to to new nic |
Date: |
Mon, 17 Jun 2013 21:35:10 +0800 |
QEMU allocates macaddr to nic if user doesn't assigne macaddr.
But we didn't check if the allocated macaddr is used, it might
cause macaddr repeated.
# qemu -device e1000,netdev=h1,mac=52:54:00:12:34:56
(qemu) device_add e1000
(qemu) info network
e1000.0: index=0,type=nic,model=e1000,macaddr=52:54:00:12:34:56
\ h1: index=0,type=user,net=10.0.2.0,restrict=off
e1000.1: index=0,type=nic,model=e1000,macaddr=52:54:00:12:34:56
This patch adds a check in allocating macaddr, reallocate macaddr
if it's used by other nic.
Signed-off-by: Amos Kong <address@hidden>
---
net/net.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/net/net.c b/net/net.c
index 43a74e4..f019da4 100644
--- a/net/net.c
+++ b/net/net.c
@@ -143,15 +143,43 @@ void qemu_macaddr_default_if_unset(MACAddr *macaddr)
{
static int index = 0;
static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
+ char info_str[256];
+ NetClientState *nc, *peer;
+ NetClientOptionsKind type;
if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
return;
+
+realloc_mac:
macaddr->a[0] = 0x52;
macaddr->a[1] = 0x54;
macaddr->a[2] = 0x00;
macaddr->a[3] = 0x12;
macaddr->a[4] = 0x34;
macaddr->a[5] = 0x56 + index++;
+
+ QTAILQ_FOREACH(nc, &net_clients, next) {
+ peer = nc->peer;
+ type = nc->info->type;
+
+ if (net_hub_id_for_client(nc, NULL) == 0) {
+ continue;
+ }
+
+ if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
+ snprintf(info_str, sizeof(info_str),
+ "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
+ nc->model,
+ macaddr->a[0], macaddr->a[1], macaddr->a[2],
+ macaddr->a[3], macaddr->a[4], macaddr->a[5]);
+
+ /* reallocate macaddr if it's used by other nic */
+ if (!strcmp(nc->info_str, info_str)) {
+ goto realloc_mac;
+ }
+ }
+ }
+
}
/**
--
1.8.1.4
Re: [Qemu-devel] [PATCH 0/2] fix macaddr allocation, Stefan Hajnoczi, 2013/06/18