[PATCH] udhcp: add PXELINUX path prefix option (code 210) definition

[Jeremy Kerr]

Like d3092c99, this change adds support for the DHCP "path-prefix"
option, as defined in RFC 5071. We use the string identifer
"pxepathprefix".

Adding this option makes string parsing in the hook scripts simpler.

Signed-off-by: Jeremy Kerr <jk at ozlabs.org>

---
 networking/udhcp/common.c |    2 ++
 networking/udhcp/common.h |    1 +
 2 files changed, 3 insertions(+)

diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
index fe322db4..bc41c8d4 100644
--- a/networking/udhcp/common.c
+++ b/networking/udhcp/common.c
@@ -63,6 +63,7 @@ const struct dhcp_optflag dhcp_optflags[] = {
 	{ OPTION_U8                               , 0x85 }, /* DHCP_VLAN_PRIORITY */
 #endif
 	{ OPTION_STRING                           , 0xd1 }, /* DHCP_PXE_CONF_FILE */
+	{ OPTION_STRING                           , 0xd2 }, /* DHCP_PXE_PATH_PREFIX */
 	{ OPTION_6RD                              , 0xd4 }, /* DHCP_6RD           */
 	{ OPTION_STATIC_ROUTES | OPTION_LIST      , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
 	{ OPTION_STRING                           , 0xfc }, /* DHCP_WPAD          */
@@ -130,6 +131,7 @@ const char dhcp_option_strings[] ALIGN1 =
 	"vlanpriority" "\0"/* DHCP_VLAN_PRIORITY  */
 #endif
 	"pxeconffile" "\0" /* DHCP_PXE_CONF_FILE  */
+	"pxepathprefix" "\0" /* DHCP_PXE_PATH_PREFIX  */
 	"ip6rd" "\0"       /* DHCP_6RD            */
 	"msstaticroutes""\0"/* DHCP_MS_STATIC_ROUTES */
 	"wpad" "\0"        /* DHCP_WPAD           */
diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index 5e70d609..e5e0f259 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -152,6 +152,7 @@ enum {
 //#define DHCP_VLAN_ID          0x84 /* 802.1P VLAN ID */
 //#define DHCP_VLAN_PRIORITY    0x85 /* 802.1Q VLAN priority */
 //#define DHCP_PXE_CONF_FILE    0xd1 /* RFC 5071 Configuration File */
+//#define DHCP_PXE_PATH_PREFIX  0xd2 /* RFC 5071 Configuration File */
 //#define DHCP_MS_STATIC_ROUTES 0xf9 /* Microsoft's pre-RFC 3442 code for 0x79? */
 //#define DHCP_WPAD             0xfc /* MSIE's Web Proxy Autodiscovery Protocol */
 #define DHCP_END                0xff