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-rw-r--r--networking/udhcp/Config.in9
-rw-r--r--networking/udhcp/options.c7
-rw-r--r--networking/udhcp/options.h3
-rw-r--r--networking/udhcp/script.c44
4 files changed, 62 insertions, 1 deletions
diff --git a/networking/udhcp/Config.in b/networking/udhcp/Config.in
index 5baaa6a49..674470a39 100644
--- a/networking/udhcp/Config.in
+++ b/networking/udhcp/Config.in
@@ -38,5 +38,14 @@ config CONFIG_FEATURE_UDHCP_DEBUG
help
Please submit a patch to add help text for this item.
+config CONFIG_FEATURE_UDHCPC_IP
+ bool " Compile udhcpc with ip support"
+ default n
+ depends on CONFIG_UDHCPC
+ help
+ Say yes if you are using the ip command instead of route and ifconfig
+ in your scripts to bring up the interface.
+ This is needed as ip wants the subnet as a bitprefix not an ip value.
+
endmenu
diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c
index 58144728e..3f3a38963 100644
--- a/networking/udhcp/options.c
+++ b/networking/udhcp/options.c
@@ -13,11 +13,16 @@
#include "options.h"
#include "leases.h"
+#include "config.h"
/* supported options are easily added here */
struct dhcp_option options[] = {
/* name[10] flags code */
- {"subnet", OPTION_IP | OPTION_REQ, 0x01},
+#ifdef CONFIG_FEATURE_UDHCPC_IP
+ {"subnet", OPTION_IP | OPTION_REQ | OPTION_PREFIX, 0x01},
+#else
+ {"subnet", OPTION_IP | OPTION_REQ, 0x01},
+#endif
{"timezone", OPTION_S32, 0x02},
{"router", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03},
{"timesvr", OPTION_IP | OPTION_LIST, 0x04},
diff --git a/networking/udhcp/options.h b/networking/udhcp/options.h
index 1fded2ef4..dccaa2af9 100644
--- a/networking/udhcp/options.h
+++ b/networking/udhcp/options.h
@@ -4,6 +4,8 @@
#include "packet.h"
+#include "config.h"
+
#define TYPE_MASK 0x0F
enum {
@@ -20,6 +22,7 @@ enum {
#define OPTION_REQ 0x10 /* have the client request this option */
#define OPTION_LIST 0x20 /* There can be a list of 1 or more of these */
+#define OPTION_PREFIX 0x40 /* ip wants a prefix instead of a ip for subnet */
struct dhcp_option {
char name[10];
diff --git a/networking/udhcp/script.c b/networking/udhcp/script.c
index 4ce23aafc..1c6f1bd33 100644
--- a/networking/udhcp/script.c
+++ b/networking/udhcp/script.c
@@ -37,6 +37,8 @@
#include "options.h"
#include "debug.h"
+#include "config.h"
+
/* get a rough idea of how long an option will be (rounding up...) */
static int max_option_length[] = {
[OPTION_IP] = sizeof("255.255.255.255 "),
@@ -62,6 +64,37 @@ static int sprintip(char *dest, char *pre, unsigned char *ip) {
return sprintf(dest, "%s%d.%d.%d.%d ", pre, ip[0], ip[1], ip[2], ip[3]);
}
+#ifdef CONFIG_FEATURE_UDHCPC_IP
+/* convert a netmask (255.255.255.0) into the length (24) */
+static int inet_ntom (const char *src, short *dst)
+{
+ in_addr_t mask, num;
+
+ mask = ntohl(*(unsigned int *)src);
+
+ for (num = mask; num & 1; num >>= 1);
+
+ if (num != 0 && mask != 0)
+ {
+ for (num = ~mask; num & 1; num >>= 1);
+ if (num)
+ return 0;
+ }
+
+ for (num = 0; mask; mask <<= 1)
+ num++;
+
+ *dst = num;
+
+ return 1;
+}
+
+static int sprintprefix(char *dest, char *pre, unsigned char *ip) {
+ short sdest = 0;
+ inet_ntom(ip, &sdest);
+ return sprintf(dest, "%s%hd ", pre, sdest);
+}
+#endif
/* Fill dest with the text of option 'option'. */
static void fill_options(char *dest, unsigned char *option, struct dhcp_option *type_p)
@@ -84,9 +117,20 @@ static void fill_options(char *dest, unsigned char *option, struct dhcp_option *
*(dest++) = '/';
option += 4;
optlen = 4;
+#ifndef CONFIG_FEATURE_UDHCPC_IP
case OPTION_IP: /* Works regardless of host byte order. */
+#endif
dest += sprintip(dest, "", option);
break;
+#ifdef CONFIG_FEATURE_UDHCPC_IP
+ case OPTION_IP: /* Works regardless of host byte order. */
+ if (type_p->flags & OPTION_PREFIX) {
+ dest += sprintprefix(dest, "", option);
+ } else {
+ dest += sprintip(dest, "", option);
+ }
+ break;
+#endif
case OPTION_BOOLEAN:
dest += sprintf(dest, *option ? "yes " : "no ");
break;