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udhcpc: send client-id option in DHCPDECLINE

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function                                             old     new   delta
add_serverid_and_clientid_options                      -      46     +46
send_decline                                          88      83      -5
perform_release                                      200     159     -41
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(add/remove: 1/0 grow/shrink: 0/2 up/down: 46/-46)              Total: 0 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2021-06-15 00:34:04 +02:00
parent 52c4b7ac3b
commit 40a327aeae
1 changed files with 22 additions and 15 deletions
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37
networking/udhcp/dhcpc.c
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@ -663,6 +663,24 @@ static void add_client_options(struct dhcp_packet *packet)
// ...add (DHCP_VENDOR, "udhcp "BB_VER) opt...
}
static void add_serverid_and_clientid_options(struct dhcp_packet *packet, uint32_t server)
{
struct option_set *ci;
udhcp_add_simple_option(packet, DHCP_SERVER_ID, server);
/* RFC 2131 section 2:
* If the client uses a 'client identifier' in one message,
* it MUST use that same identifier in all subsequent messages.
* section 3.1.6:
* 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);
if (ci)
udhcp_add_binary_option(packet, ci->data);
}
/* RFC 2131
* 4.4.4 Use of broadcast and unicast
*
@ -759,7 +777,7 @@ static NOINLINE int send_select(uint32_t xid, uint32_t server, uint32_t requeste
udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server);
/* Add options: maxsize,
* "param req" option according to -O, and options specified with -x
* "param req" option according to -O, options specified with -x
*/
add_client_options(&packet);
@ -803,7 +821,7 @@ static NOINLINE int send_renew(uint32_t xid, uint32_t server, uint32_t ciaddr)
packet.ciaddr = ciaddr;
/* Add options: maxsize,
* "param req" option according to -O, and options specified with -x
* "param req" option according to -O, options specified with -x
*/
add_client_options(&packet);
@ -841,9 +859,7 @@ static NOINLINE int send_decline(/*uint32_t xid,*/ uint32_t server, uint32_t req
/* DHCPDECLINE uses "requested ip", not ciaddr, to store offered IP */
udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested);
udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server);
//TODO: add client-id opt?
add_serverid_and_clientid_options(&packet, server);
bb_simple_info_msg("broadcasting decline");
return raw_bcast_from_client_data_ifindex(&packet, INADDR_ANY);
@ -856,7 +872,6 @@ ALWAYS_INLINE /* one caller, help compiler to use this fact */
int send_release(uint32_t server, uint32_t ciaddr)
{
struct dhcp_packet packet;
struct option_set *ci;
/* Fill in: op, htype, hlen, cookie, chaddr, random xid fields,
* message type option:
@ -866,15 +881,7 @@ int send_release(uint32_t server, uint32_t ciaddr)
/* DHCPRELEASE uses ciaddr, not "requested ip", to store IP being released */
packet.ciaddr = ciaddr;
udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server);
/* RFC 2131 section 3.1.6:
* 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);
if (ci)
udhcp_add_binary_option(&packet, ci->data);
add_serverid_and_clientid_options(&packet, server);
bb_info_msg("sending %s", "release");
/* Note: normally we unicast here since "server" is not zero.