udhcpc6: add DHCPv6 boot options

Add support for 'bootfile-url' and 'bootfile-params' as defined by
RFC5970 "DHCPv6 Options for Network Boot".

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 28 insertions, 0 deletions

diff --git a/networking/udhcp/d6_common.h b/networking/udhcp/d6_common.h
index e9c0397ae..d0506e2bb 100644
--- a/networking/udhcp/d6_common.h
+++ b/networking/udhcp/d6_common.h
@@ -128,6 +128,9 @@ struct d6_option {
 #define D6_OPT_TZ_POSIX      41
 #define D6_OPT_TZ_NAME       42
 
+#define D6_OPT_BOOT_URL      59
+#define D6_OPT_BOOT_PARAM    60
+
 /*** Other shared functions ***/
 
 struct client6_data_t {
diff --git a/networking/udhcp/d6_dhcpc.c b/networking/udhcp/d6_dhcpc.c
index fa1568b5f..f837bd549 100644
--- a/networking/udhcp/d6_dhcpc.c
+++ b/networking/udhcp/d6_dhcpc.c
@@ -38,6 +38,14 @@
 //config:       help
 //config:       You can request POSIX timezone with "-O tz" and timezone name
 //config:       with "-O timezone".
+//config:
+//config:config FEATURE_UDHCPC6_RFC5970
+//config:       bool "Support RFC 5970 (Network Boot)"
+//config:       default y
+//config:       depends on UDHCPC6
+//config:       help
+//config:       You can request bootfile-url with "-O bootfile_url" and
+//config:       bootfile-params with "-O bootfile_params".
 
 //applet:IF_UDHCPC6(APPLET(udhcpc6, BB_DIR_USR_BIN, BB_SUID_DROP))
 
@@ -71,6 +79,10 @@ static const struct dhcp_optflag d6_optflags[] = {
         { OPTION_STRING,                                D6_OPT_TZ_POSIX },
         { OPTION_STRING,                                D6_OPT_TZ_NAME },
 #endif
+#if ENABLE_FEATURE_UDHCPC6_RFC5970
+        { OPTION_STRING,                                D6_OPT_BOOT_URL },
+        { OPTION_STRING,                                D6_OPT_BOOT_PARAM },
+#endif
         { 0, 0 }
 };
 /* Must match d6_optflags[] order */
@@ -86,6 +98,11 @@ static const char d6_option_strings[] ALIGN1 =
         "tz" "\0"       /* D6_OPT_TZ_POSIX */
         "timezone" "\0" /* D6_OPT_TZ_NAME */
 #endif
+#if ENABLE_FEATURE_UDHCPC6_RFC5970
+        "bootfile_url" "\0" /* D6_OPT_BOOT_URL */
+        "bootfile_param" "\0" /* D6_OPT_BOOT_PARAM */
+#endif
+
         "\0";
 
 #if ENABLE_LONG_OPTS
@@ -382,6 +399,14 @@ static void option_to_env(uint8_t *option, uint8_t *option_end)
                         *new_env() = xasprintf("tz_name=%.*s", (int)option[3], (char*)option + 4);
                         break;
 #endif
+                case D6_OPT_BOOT_URL:
+                case D6_OPT_BOOT_PARAM:
+                        {
+                        char *tmp = string_option_to_env(option, option_end);
+                        if (tmp)
+                                *new_env() = tmp;
+                        break;
+                        }
                 }
                 len_m4 -= 4 + option[3];
                 option += 4 + option[3];