linux-kernel - Re: [PATCH] ipconfig.c : implement DHCP Class-identifier

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Message-ID: <20071114094508.GA6004@mpi-sb.mpg.de>
Date:	Wed, 14 Nov 2007 10:45:08 +0100
From:	Rainer Jochem <rainer.jochem@...-sb.mpg.de>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	pcernko@...-sws.mpg.de
Subject: Re: [PATCH] ipconfig.c : implement DHCP Class-identifier



> I don't think its very useful since you can simply get this information
> from /proc/cmdline in case something goes wrong, but if you insist at
> least give it a meaningful prefix.

Added.

> The initialization is unnecessary.

Removed.

> Should be >= I think.

Fixed.


Regards,
 Rainer

----

--- net/ipv4/ipconfig.c.orig	2007-11-14 09:16:15.800566536 +0100
+++ net/ipv4/ipconfig.c	2007-11-14 10:34:22.471219274 +0100
@@ -139,6 +139,8 @@ __be32 ic_servaddr = NONE;	/* Boot serve
 __be32 root_server_addr = NONE;	/* Address of NFS server */
 u8 root_server_path[256] = { 0, };	/* Path to mount as root */
 
+static char vendor_class_identifier[253]; /* vendor class identifier */
+
 /* Persistent data: */
 
 static int ic_proto_used;			/* Protocol used, if any */
@@ -580,6 +582,7 @@ ic_dhcp_init_options(u8 *options)
 	u8 mt = ((ic_servaddr == NONE)
 		 ? DHCPDISCOVER : DHCPREQUEST);
 	u8 *e = options;
+	int len;
 
 #ifdef IPCONFIG_DEBUG
 	printk("DHCP: Sending message type %d\n", mt);
@@ -620,6 +623,16 @@ ic_dhcp_init_options(u8 *options)
 		*e++ = sizeof(ic_req_params);
 		memcpy(e, ic_req_params, sizeof(ic_req_params));
 		e += sizeof(ic_req_params);
+
+		if (*vendor_class_identifier) {
+			printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
+			       vendor_class_identifier);
+			*e++ = 60;	/* Class-identifier */
+			len = strlen(vendor_class_identifier);
+			*e++ = len;
+			memcpy(e, vendor_class_identifier, len);
+			e += len;
+		}
 	}
 
 	*e++ = 255;	/* End of the list */
@@ -1507,5 +1520,16 @@ static int __init nfsaddrs_config_setup(
 	return ip_auto_config_setup(addrs);
 }
 
+static int __init vendor_class_identifier_setup(char *addrs)
+{
+	if (strlcpy(vendor_class_identifier, addrs,
+		    sizeof(vendor_class_identifier))
+	    >= sizeof(vendor_class_identifier))
+		printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
+		       vendor_class_identifier);
+	return 1;
+}
+
 __setup("ip=", ip_auto_config_setup);
 __setup("nfsaddrs=", nfsaddrs_config_setup);
+__setup("dhcpclass=", vendor_class_identifier_setup);
-
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