udhcpc: add support for DHCP option 212 (RFC 5969)

The patch is from OpenWRT people.

function                                             old     new   delta
xmalloc_optname_optval                               637     874    +237
dhcp_option_strings                                  237     243      +6
dhcp_optflags                                         68      70      +2
len_of_option_as_string                               12      13      +1
dhcp_option_lengths                                   12      13      +1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 5/0 up/down: 247/0)             Total: 247 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
index 70e34614c..ba41905cc 100644
--- a/networking/udhcp/common.c
+++ b/networking/udhcp/common.c
@@ -59,6 +59,7 @@ const struct dhcp_optflag dhcp_optflags[] = {
         { OPTION_U16                              , 0x84 }, /* DHCP_VLAN_ID       */
         { OPTION_U8                               , 0x85 }, /* DHCP_VLAN_PRIORITY */
 #endif
+        { OPTION_6RD                              , 0xd4 }, /* DHCP_6RD           */
         { OPTION_STATIC_ROUTES                    , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
         { OPTION_STRING                           , 0xfc }, /* DHCP_WPAD          */
 
@@ -126,6 +127,7 @@ const char dhcp_option_strings[] ALIGN1 =
         "vlanid" "\0"      /* DHCP_VLAN_ID        */
         "vlanpriority" "\0"/* DHCP_VLAN_PRIORITY  */
 #endif
+        "ip6rd" "\0"       /* DHCP_6RD            */
         "msstaticroutes""\0"/* DHCP_MS_STATIC_ROUTES */
         "wpad" "\0"        /* DHCP_WPAD           */
         ;
@@ -154,6 +156,7 @@ const uint8_t dhcp_option_lengths[] ALIGN1 = {
         [OPTION_S32] =     4,
         /* Just like OPTION_STRING, we use minimum length here */
         [OPTION_STATIC_ROUTES] = 5,
+        [OPTION_6RD] =    22,  /* ignored by udhcp_str2optset */
 };