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udhcpc: include client-id option in DECLINEs, even if it's a custom -x 61:HEX option

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client_data.vendorclass, .hostname and .fqdn probably need the same treatment:
just insert them into the list of -x opts, get rid of

        if (client_data.vendorclass)
                udhcp_add_binary_option(packet, client_data.vendorclass);
        if (client_data.hostname)
                udhcp_add_binary_option(packet, client_data.hostname);
        if (client_data.fqdn)
                udhcp_add_binary_option(packet, client_data.fqdn);

function                                             old     new   delta
udhcp_insert_new_option                                -     166    +166
perform_release                                      171     207     +36
perform_d6_release                                   227     259     +32
udhcpc6_main                                        2558    2580     +22
init_d6_packet                                       103      84     -19
udhcpc_main                                         2585    2564     -21
attach_option                                        397     253    -144
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 3/3 up/down: 256/-184)           Total: 72 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2021-06-02 13:50:26 +02:00
parent 9659a8db1d
commit 265fcddd08
5 changed files with 115 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
networking/udhcp/dhcpc.c
View File

@@ -612,9 +612,7 @@ static void init_packet(struct dhcp_packet *packet, char type)
secs = client_data.last_secs - client_data.first_secs;
packet->secs = (secs < 0xffff) ? htons(secs) : 0xffff;
memcpy(packet->chaddr, client_data.client_mac, 6);
if (client_data.clientid)
udhcp_add_binary_option(packet, client_data.clientid);
memcpy(packet->chaddr, client_data_client_mac, 6);
}
static void add_client_options(struct dhcp_packet *packet)
@@ -715,7 +713,7 @@ static NOINLINE int send_discover(uint32_t xid, uint32_t requested)
/* Fill in: op, htype, hlen, cookie, chaddr fields,
* random xid field (we override it below),
* client-id option (unless -C), message type option:
* message type option:
*/
init_packet(&packet, DHCPDISCOVER);
@@ -724,7 +722,7 @@ static NOINLINE int send_discover(uint32_t xid, uint32_t requested)
udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested);
/* Add options: maxsize,
* optionally: hostname, fqdn, vendorclass,
* optionally: hostname, fqdn, vendorclass, client-id,
* "param req" option according to -O, options specified with -x
*/
add_client_options(&packet);
@@ -758,7 +756,7 @@ static NOINLINE int send_select(uint32_t xid, uint32_t server, uint32_t requeste
*/
/* Fill in: op, htype, hlen, cookie, chaddr fields,
* random xid field (we override it below),
* client-id option (unless -C), message type option:
* message type option:
*/
init_packet(&packet, DHCPREQUEST);
@@ -768,7 +766,7 @@ 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,
* optionally: hostname, fqdn, vendorclass,
* optionally: hostname, fqdn, vendorclass, client-id,
* "param req" option according to -O, and options specified with -x
*/
add_client_options(&packet);
@@ -805,7 +803,7 @@ static NOINLINE int send_renew(uint32_t xid, uint32_t server, uint32_t ciaddr)
*/
/* Fill in: op, htype, hlen, cookie, chaddr fields,
* random xid field (we override it below),
* client-id option (unless -C), message type option:
* message type option:
*/
init_packet(&packet, DHCPREQUEST);
@@ -813,7 +811,7 @@ static NOINLINE int send_renew(uint32_t xid, uint32_t server, uint32_t ciaddr)
packet.ciaddr = ciaddr;
/* Add options: maxsize,
* optionally: hostname, fqdn, vendorclass,
* optionally: hostname, fqdn, vendorclass, client-id,
* "param req" option according to -O, and options specified with -x
*/
add_client_options(&packet);
@@ -837,7 +835,7 @@ static NOINLINE int send_decline(/*uint32_t xid,*/ uint32_t server, uint32_t req
struct dhcp_packet packet;
/* Fill in: op, htype, hlen, cookie, chaddr, random xid fields,
* client-id option (unless -C), message type option:
* message type option:
*/
init_packet(&packet, DHCPDECLINE);
@@ -854,6 +852,8 @@ static NOINLINE int send_decline(/*uint32_t xid,*/ uint32_t server, uint32_t req
udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server);
//TODO: add client-id opt?
bb_simple_info_msg("broadcasting decline");
return raw_bcast_from_client_data_ifindex(&packet, INADDR_ANY);
}
@@ -865,9 +865,10 @@ 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,
* client-id option (unless -C), message type option:
* message type option:
*/
init_packet(&packet, DHCPRELEASE);
@@ -876,6 +877,14 @@ int send_release(uint32_t server, uint32_t 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);
bb_info_msg("sending %s", "release");
/* Note: normally we unicast here since "server" is not zero.
* However, there _are_ people who run "address-less" DHCP servers,
@@ -1230,7 +1239,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
const char *str_V, *str_h, *str_F, *str_r;
IF_FEATURE_UDHCPC_ARPING(const char *str_a = "2000";)
IF_FEATURE_UDHCP_PORT(char *str_P;)
void *clientid_mac_ptr;
uint8_t *clientid_mac_ptr;
llist_t *list_O = NULL;
llist_t *list_x = NULL;
int tryagain_timeout = 20;
@@ -1339,7 +1348,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
if (udhcp_read_interface(client_data.interface,
&client_data.ifindex,
NULL,
client_data.client_mac)
client_data_client_mac)
) {
return 1;
}
@@ -1347,10 +1356,11 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
clientid_mac_ptr = NULL;
if (!(opt & OPT_C) && !udhcp_find_option(client_data.options, DHCP_CLIENT_ID)) {
/* not suppressed and not set, set the default client ID */
client_data.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7);
client_data.clientid[OPT_DATA] = 1; /* type: ethernet */
clientid_mac_ptr = client_data.clientid + OPT_DATA+1;
memcpy(clientid_mac_ptr, client_data.client_mac, 6);
client_data_client_mac[-1] = 1; /* type: ethernet */
clientid_mac_ptr = udhcp_insert_new_option(
&client_data.options, DHCP_CLIENT_ID,
client_data_client_mac - 1, 1 + 6, /*dhcp6:*/ 0);
clientid_mac_ptr += 3; /* skip option code, len, ethernet */
}
if (str_V[0] != '\0') {
// can drop -V, str_V, client_data.vendorclass,
@@ -1447,12 +1457,12 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
if (udhcp_read_interface(client_data.interface,
&client_data.ifindex,
NULL,
client_data.client_mac)
client_data_client_mac)
) {
goto ret0; /* iface is gone? */
}
if (clientid_mac_ptr)
memcpy(clientid_mac_ptr, client_data.client_mac, 6);
memcpy(clientid_mac_ptr, client_data_client_mac, 6);
switch (client_data.state) {
case INIT_SELECTING:
@@ -1569,7 +1579,9 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
continue;
/* case RELEASED: */
}
/* yah, I know, *you* say it would never happen */
/* RELEASED state (when we got SIGUSR2) ends up here.
* (wait for SIGUSR1 to re-init, or for TERM, etc)
*/
timeout = INT_MAX;
continue; /* back to main loop */
} /* if poll timed out */
@@ -1645,7 +1657,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
/* Ignore packets that aren't for us */
if (packet.hlen != 6
|| memcmp(packet.chaddr, client_data.client_mac, 6) != 0
|| memcmp(packet.chaddr, client_data_client_mac, 6) != 0
) {
//FIXME: need to also check that last 10 bytes are zero
log1("chaddr does not match%s", ", ignoring packet"); // log2?
@@ -1757,7 +1769,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
if (!arpping(requested_ip,
NULL,
(uint32_t) 0,
client_data.client_mac,
client_data_client_mac,
client_data.interface,
arpping_ms)
) {