udhcpc6: fix udhcp_find_option to actually find DHCP6 options
udhcp_insert_new_option treats code for IPv6 as follows:
new->data[D6_OPT_CODE] = code >> 8;
new->data[D6_OPT_CODE + 1] = code & 0xff;
udhcp_find_option tests the code as follows:
while (opt_list && opt_list->data[OPT_CODE] < code)
...
if (opt_list && opt_list->data[OPT_CODE] == code)
So yes, OPT_CODE and D6_OPT_CODE are both 0, but the D6_OPT_CLIENTID =
1 value means that the 1 is in the seconds byte, and udhcp_find_option
is only looking at the first byte, So the send_d6_release can never
find it the created option.
function old new delta
udhcp_find_option 28 53 +25
attach_option 276 284 +8
udhcpc6_main 2602 2607 +5
perform_d6_release 262 267 +5
udhcpd_main 1518 1520 +2
udhcpc_main 2542 2544 +2
add_serverid_and_clientid_options 46 48 +2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 7/0 up/down: 49/0) Total: 49 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 331f13a..c757fb3 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -658,7 +658,7 @@
// This will be needed if we remove -V VENDOR_STR in favor of
// -x vendor:VENDOR_STR
- //if (!udhcp_find_option(packet.options, DHCP_VENDOR))
+ //if (!udhcp_find_option(packet.options, DHCP_VENDOR, /*dhcpv6:*/ 0))
// /* not set, set the default vendor ID */
// ...add (DHCP_VENDOR, "udhcp "BB_VER) opt...
}
@@ -676,7 +676,7 @@
* If the client used a 'client identifier' when it obtained the lease,
* it MUST use the same 'client identifier' in the DHCPRELEASE message.
*/
- ci = udhcp_find_option(client_data.options, DHCP_CLIENT_ID);
+ ci = udhcp_find_option(client_data.options, DHCP_CLIENT_ID, /*dhcpv6:*/ 0);
if (ci)
udhcp_add_binary_option(packet, ci->data);
}
@@ -1328,7 +1328,7 @@
}
clientid_mac_ptr = NULL;
- if (!(opt & OPT_C) && !udhcp_find_option(client_data.options, DHCP_CLIENT_ID)) {
+ if (!(opt & OPT_C) && !udhcp_find_option(client_data.options, DHCP_CLIENT_ID, /*dhcpv6:*/ 0)) {
/* not suppressed and not set, create default client ID */
clientid_mac_ptr = udhcp_insert_new_option(
&client_data.options, DHCP_CLIENT_ID,