[IPV4] ipconfig: Implement DHCP Class-identifier

From : Rainer Jochem <rainer.jochem@mpi-sb.mpg.de>

Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index b8f7763b2261474e4e5d35961193bcdcbebf26cd..6422422b8e3d9282af1b7e4635d7b9c1ab10f7dc 100644 (file)
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -140,6 +140,8 @@ __be32 ic_servaddr = NONE;  /* Boot server IP address */
 __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 */
@@ -588,6 +590,7 @@ 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);
@@ -628,6 +631,16 @@ 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 */
@@ -1513,5 +1526,16 @@ static int __init nfsaddrs_config_setup(char *addrs)
        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);