From 130c0f47fdf9c533deb1136cad5136f6cb7020f0 Mon Sep 17 00:00:00 2001
From: Wu Fengguang <fengguang.wu@intel.com>
Date: Sun, 30 May 2010 17:19:53 +0000
Subject: ipconfig: send host-name in DHCP requests
Normally dhclient can be configured to send the "host-name" option
in DHCP requests to update the client's DNS record. However for an
NFSROOT system, dhclient shall never be called (which may change the
IP addr and therefore lose your root NFS mount connection).
So enable updating the DNS record with kernel parameter
ip=::::$HOST_NAME::dhcp
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv4/ipconfig.c | 7 +++++++
1 file changed, 7 insertions(+)
(limited to 'net/ipv4')
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index b9d84e800cf..3a6e1ec5e9a 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -665,6 +665,13 @@ ic_dhcp_init_options(u8 *options)
memcpy(e, ic_req_params, sizeof(ic_req_params));
e += sizeof(ic_req_params);
+ if (ic_host_name_set) {
+ *e++ = 12; /* host-name */
+ len = strlen(utsname()->nodename);
+ *e++ = len;
+ memcpy(e, utsname()->nodename, len);
+ e += len;
+ }
if (*vendor_class_identifier) {
printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
vendor_class_identifier);
--
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