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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

58
networking/udhcp/d6_dhcpc.c
View File

@@ -482,7 +482,6 @@ static ALWAYS_INLINE uint32_t random_xid(void)
static uint8_t *init_d6_packet(struct d6_packet *packet, char type, uint32_t xid)
{
uint8_t *ptr;
struct d6_option *clientid;
unsigned secs;
memset(packet, 0, sizeof(*packet));
@@ -503,9 +502,7 @@ static uint8_t *init_d6_packet(struct d6_packet *packet, char type, uint32_t xid
*((uint16_t*)ptr) = (secs < 0xffff) ? htons(secs) : 0xffff;
ptr += 2;
/* add CLIENTID option */
clientid = (void*)client_data.clientid;
return mempcpy(ptr, clientid, clientid->len + 2+2);
return ptr;
}
static uint8_t *add_d6_client_options(uint8_t *ptr)
@@ -593,10 +590,10 @@ static NOINLINE int send_d6_info_request(uint32_t xid)
struct d6_packet packet;
uint8_t *opt_ptr;
/* Fill in: msg type, client id */
/* Fill in: msg type */
opt_ptr = init_d6_packet(&packet, D6_MSG_INFORMATION_REQUEST, xid);
/* Add options:
/* Add options: client-id,
* "param req" option according to -O, options specified with -x
*/
opt_ptr = add_d6_client_options(opt_ptr);
@@ -693,7 +690,7 @@ static NOINLINE int send_d6_discover(uint32_t xid, struct in6_addr *requested_ip
uint8_t *opt_ptr;
unsigned len;
/* Fill in: msg type, client id */
/* Fill in: msg type */
opt_ptr = init_d6_packet(&packet, D6_MSG_SOLICIT, xid);
/* Create new IA_NA, optionally with included IAADDR with requested IP */
@@ -726,7 +723,7 @@ static NOINLINE int send_d6_discover(uint32_t xid, struct in6_addr *requested_ip
opt_ptr = mempcpy(opt_ptr, client6_data.ia_pd, len);
}
/* Add options:
/* Add options: client-id,
* "param req" option according to -O, options specified with -x
*/
opt_ptr = add_d6_client_options(opt_ptr);
@@ -771,7 +768,7 @@ static NOINLINE int send_d6_select(uint32_t xid)
struct d6_packet packet;
uint8_t *opt_ptr;
/* Fill in: msg type, client id */
/* Fill in: msg type */
opt_ptr = init_d6_packet(&packet, D6_MSG_REQUEST, xid);
/* server id */
@@ -783,7 +780,7 @@ static NOINLINE int send_d6_select(uint32_t xid)
if (client6_data.ia_pd)
opt_ptr = mempcpy(opt_ptr, client6_data.ia_pd, client6_data.ia_pd->len + 2+2);
/* Add options:
/* Add options: client-id,
* "param req" option according to -O, options specified with -x
*/
opt_ptr = add_d6_client_options(opt_ptr);
@@ -844,7 +841,7 @@ static NOINLINE int send_d6_renew(uint32_t xid, struct in6_addr *server_ipv6, st
struct d6_packet packet;
uint8_t *opt_ptr;
/* Fill in: msg type, client id */
/* Fill in: msg type */
opt_ptr = init_d6_packet(&packet, DHCPREQUEST, xid);
/* server id */
@@ -856,7 +853,7 @@ static NOINLINE int send_d6_renew(uint32_t xid, struct in6_addr *server_ipv6, st
if (client6_data.ia_pd)
opt_ptr = mempcpy(opt_ptr, client6_data.ia_pd, client6_data.ia_pd->len + 2+2);
/* Add options:
/* Add options: client-id,
* "param req" option according to -O, options specified with -x
*/
opt_ptr = add_d6_client_options(opt_ptr);
@@ -878,6 +875,7 @@ int send_d6_release(struct in6_addr *server_ipv6, struct in6_addr *our_cur_ipv6)
{
struct d6_packet packet;
uint8_t *opt_ptr;
struct option_set *ci;
/* Fill in: msg type, client id */
opt_ptr = init_d6_packet(&packet, D6_MSG_RELEASE, random_xid());
@@ -889,6 +887,10 @@ int send_d6_release(struct in6_addr *server_ipv6, struct in6_addr *our_cur_ipv6)
/* IA PD */
if (client6_data.ia_pd)
opt_ptr = mempcpy(opt_ptr, client6_data.ia_pd, client6_data.ia_pd->len + 2+2);
/* Client-id */
ci = udhcp_find_option(client_data.options, D6_OPT_CLIENTID);
if (ci)
opt_ptr = mempcpy(opt_ptr, ci->data, D6_OPT_DATA + 2+2 + 6);
bb_info_msg("sending %s", "release");
return d6_send_kernel_packet_from_client_data_ifindex(
@@ -1184,7 +1186,7 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
{
const char *str_r;
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;
@@ -1284,22 +1286,19 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
if (d6_read_interface(client_data.interface,
&client_data.ifindex,
&client6_data.ll_ip6,
client_data.client_mac)
client_data_client_mac)
) {
return 1;
}
/* Create client ID based on mac, set clientid_mac_ptr */
{
struct d6_option *clientid;
clientid = xzalloc(2+2+2+2+6);
clientid->code = D6_OPT_CLIENTID;
clientid->len = 2+2+6;
clientid->data[1] = 3; /* DUID-LL */
clientid->data[3] = 1; /* ethernet */
clientid_mac_ptr = clientid->data + 2+2;
memcpy(clientid_mac_ptr, client_data.client_mac, 6);
client_data.clientid = (void*)clientid;
clientid_mac_ptr = NULL;
if (!udhcp_find_option(client_data.options, D6_OPT_CLIENTID)) {
/* not set, set the default client ID */
client_data.clientid[1] = 3; /* DUID-LL */
client_data.clientid[3] = 1; /* ethernet */
clientid_mac_ptr = udhcp_insert_new_option(&client_data.options, D6_OPT_CLIENTID,
client_data.clientid, 2+2 + 6, /*dhcp6:*/ 1);
clientid_mac_ptr += 2+2 + 2+2; /* skip option code, len, DUID-LL, ethernet */
}
#if !BB_MMU
@@ -1386,12 +1385,13 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
if (d6_read_interface(client_data.interface,
&client_data.ifindex,
&client6_data.ll_ip6,
client_data.client_mac)
client_data_client_mac)
) {
goto ret0; /* iface is gone? */
}
memcpy(clientid_mac_ptr, client_data.client_mac, 6);
if (clientid_mac_ptr)
memcpy(clientid_mac_ptr, client_data_client_mac, 6);
switch (client_data.state) {
case INIT_SELECTING:
@@ -1505,7 +1505,9 @@ int udhcpc6_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 */