Merge tag 'regulator-v4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...

[firefly-linux-kernel-4.4.55.git] / net / ipv4 / ipconfig.c

diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index ed4ef09c2136ec34871fc240a8197bf694e2d9ef..0bc7412d9e14a3395ab9c877ee6683f33748a3b1 100644 (file)
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -146,6 +146,10 @@ u8 root_server_path[256] = { 0, }; /* Path to mount as root */
 /* vendor class identifier */
 static char vendor_class_identifier[253] __initdata;
 
+#if defined(CONFIG_IP_PNP_DHCP)
+static char dhcp_client_identifier[253] __initdata;
+#endif
+
 /* Persistent data: */
 
 static int ic_proto_used;                      /* Protocol used, if any */
@@ -728,6 +732,16 @@ ic_dhcp_init_options(u8 *options)
                        memcpy(e, vendor_class_identifier, len);
                        e += len;
                }
+               len = strlen(dhcp_client_identifier + 1);
+               /* the minimum length of identifier is 2, include 1 byte type,
+                * and can not be larger than the length of options
+                */
+               if (len >= 1 && len < 312 - (e - options) - 1) {
+                       *e++ = 61;
+                       *e++ = len + 1;
+                       memcpy(e, dhcp_client_identifier, len + 1);
+                       e += len + 1;
+               }
        }
 
        *e++ = 255;     /* End of the list */
@@ -1557,8 +1571,24 @@ static int __init ic_proto_name(char *name)
                return 0;
        }
 #ifdef CONFIG_IP_PNP_DHCP
-       else if (!strcmp(name, "dhcp")) {
+       else if (!strncmp(name, "dhcp", 4)) {
+               char *client_id;
+
                ic_proto_enabled &= ~IC_RARP;
+               client_id = strstr(name, "dhcp,");
+               if (client_id) {
+                       char *v;
+
+                       client_id = client_id + 5;
+                       v = strchr(client_id, ',');
+                       if (!v)
+                               return 1;
+                       *v = 0;
+                       if (kstrtou8(client_id, 0, dhcp_client_identifier))
+                               DBG("DHCP: Invalid client identifier type\n");
+                       strncpy(dhcp_client_identifier + 1, v + 1, 251);
+                       *v = ',';
+               }
                return 1;
        }
 #endif