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udhcpc6: add support of prefix delegation

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Based on patch by DannyAAM <danny@saru.moe>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2018-01-16 21:39:14 +01:00
parent 1e8d79ba12
commit ef5207f093
2 changed files with 101 additions and 22 deletions
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1
networking/udhcp/d6_common.h
View File

@@ -133,6 +133,7 @@ struct d6_option {
struct client6_data_t {
struct d6_option *server_id;
struct d6_option *ia_na;
struct d6_option *ia_pd;
char **env_ptr;
unsigned env_idx;
/* link-local IPv6 address */

122
networking/udhcp/d6_dhcpc.c
View File

@@ -96,6 +96,7 @@ static const char udhcpc6_longopts[] ALIGN1 =
"quit\0" No_argument "q"
"release\0" No_argument "R"
"request\0" Required_argument "r"
"requestprefix\0" No_argument "d"
"script\0" Required_argument "s"
"timeout\0" Required_argument "T"
"retries\0" Required_argument "t"
@@ -128,8 +129,9 @@ enum {
OPT_o = 1 << 12,
OPT_x = 1 << 13,
OPT_f = 1 << 14,
OPT_d = 1 << 15,
/* The rest has variable bit positions, need to be clever */
OPTBIT_f = 14,
OPTBIT_d = 15,
USE_FOR_MMU( OPTBIT_b,)
///IF_FEATURE_UDHCPC_ARPING(OPTBIT_a,)
IF_FEATURE_UDHCP_PORT( OPTBIT_P,)
@@ -561,18 +563,33 @@ static NOINLINE int send_d6_discover(uint32_t xid, struct in6_addr *requested_ip
/* Create new IA_NA, optionally with included IAADDR with requested IP */
free(client6_data.ia_na);
len = requested_ipv6 ? 2+2+4+4+4 + 2+2+16+4+4 : 2+2+4+4+4;
client6_data.ia_na = xzalloc(len);
client6_data.ia_na->code = D6_OPT_IA_NA;
client6_data.ia_na->len = len - 4;
*(uint32_t*)client6_data.ia_na->data = rand(); /* IAID */
if (requested_ipv6) {
struct d6_option *iaaddr = (void*)(client6_data.ia_na->data + 4+4+4);
iaaddr->code = D6_OPT_IAADDR;
iaaddr->len = 16+4+4;
memcpy(iaaddr->data, requested_ipv6, 16);
client6_data.ia_na = NULL;
if (option_mask32 & OPT_r) {
len = requested_ipv6 ? 2+2+4+4+4 + 2+2+16+4+4 : 2+2+4+4+4;
client6_data.ia_na = xzalloc(len);
client6_data.ia_na->code = D6_OPT_IA_NA;
client6_data.ia_na->len = len - 4;
*(uint32_t*)client6_data.ia_na->data = rand(); /* IAID */
if (requested_ipv6) {
struct d6_option *iaaddr = (void*)(client6_data.ia_na->data + 4+4+4);
iaaddr->code = D6_OPT_IAADDR;
iaaddr->len = 16+4+4;
memcpy(iaaddr->data, requested_ipv6, 16);
}
opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, len);
}
/* IA_PD */
free(client6_data.ia_pd);
client6_data.ia_pd = NULL;
if (option_mask32 & OPT_d) {
len = 2+2+4+4+4;
client6_data.ia_pd = xzalloc(len);
client6_data.ia_pd->code = D6_OPT_IA_PD;
client6_data.ia_pd->len = len - 4;
*(uint32_t*)client6_data.ia_pd->data = rand(); /* IAID */
opt_ptr = mempcpy(opt_ptr, client6_data.ia_pd, len);
}
opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, len);
/* Add options:
* "param req" option according to -O, options specified with -x
@@ -625,7 +642,11 @@ static NOINLINE int send_d6_select(uint32_t xid)
/* server id */
opt_ptr = mempcpy(opt_ptr, client6_data.server_id, client6_data.server_id->len + 2+2);
/* IA NA (contains requested IP) */
opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
if (client6_data.ia_na)
opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
/* IA PD */
if (client6_data.ia_pd)
opt_ptr = mempcpy(opt_ptr, client6_data.ia_pd, client6_data.ia_pd->len + 2+2);
/* Add options:
* "param req" option according to -O, options specified with -x
@@ -694,7 +715,11 @@ static NOINLINE int send_d6_renew(uint32_t xid, struct in6_addr *server_ipv6, st
/* server id */
opt_ptr = mempcpy(opt_ptr, client6_data.server_id, client6_data.server_id->len + 2+2);
/* IA NA (contains requested IP) */
opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
if (client6_data.ia_na)
opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
/* IA PD */
if (client6_data.ia_pd)
opt_ptr = mempcpy(opt_ptr, client6_data.ia_pd, client6_data.ia_pd->len + 2+2);
/* Add options:
* "param req" option according to -O, options specified with -x
@@ -725,7 +750,11 @@ static int send_d6_release(struct in6_addr *server_ipv6, struct in6_addr *our_cu
/* server id */
opt_ptr = mempcpy(opt_ptr, client6_data.server_id, client6_data.server_id->len + 2+2);
/* IA NA (contains our current IP) */
opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
if (client6_data.ia_na)
opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
/* IA PD */
if (client6_data.ia_pd)
opt_ptr = mempcpy(opt_ptr, client6_data.ia_pd, client6_data.ia_pd->len + 2+2);
bb_error_msg("sending %s", "release");
return d6_send_kernel_packet(
@@ -1028,7 +1057,8 @@ static void client_background(void)
////usage: )
//usage: "\n -O,--request-option OPT Request option OPT from server (cumulative)"
//usage: "\n -o,--no-default-options Don't request any options (unless -O is given)"
//usage: "\n -r,--request IP Request this IP address"
//usage: "\n -r,--request IP Request this IP address ('no' to not request any IP)"
//usage: "\n -d,--requestprefix Request prefix"
//usage: "\n -x OPT:VAL Include option OPT in sent packets (cumulative)"
//usage: "\n Examples of string, numeric, and hex byte opts:"
//usage: "\n -x hostname:bbox - option 12"
@@ -1062,7 +1092,8 @@ static void client_background(void)
////usage: )
//usage: "\n -O OPT Request option OPT from server (cumulative)"
//usage: "\n -o Don't request any options (unless -O is given)"
//usage: "\n -r IP Request this IP address"
//usage: "\n -r IP Request this IP address ('no' to not request any IP)"
//usage: "\n -d Request prefix"
//usage: "\n -x OPT:VAL Include option OPT in sent packets (cumulative)"
//usage: "\n Examples of string, numeric, and hex byte opts:"
//usage: "\n -x hostname:bbox - option 12"
@@ -1109,7 +1140,7 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
/* Parse command line */
opt = getopt32long(argv, "^"
/* O,x: list; -T,-t,-A take numeric param */
"i:np:qRr:s:T:+t:+SA:+O:*ox:*f"
"i:np:qRr:s:T:+t:+SA:+O:*ox:*fd"
USE_FOR_MMU("b")
///IF_FEATURE_UDHCPC_ARPING("a")
IF_FEATURE_UDHCP_PORT("P:")
@@ -1125,10 +1156,15 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
IF_UDHCP_VERBOSE(, &dhcp_verbose)
);
requested_ipv6 = NULL;
option_mask32 |= OPT_r;
if (opt & OPT_r) {
if (inet_pton(AF_INET6, str_r, &ipv6_buf) <= 0)
bb_error_msg_and_die("bad IPv6 address '%s'", str_r);
requested_ipv6 = &ipv6_buf;
if (strcmp(str_r, "no") == 0) {
option_mask32 -= OPT_r;
} else {
if (inet_pton(AF_INET6, str_r, &ipv6_buf) <= 0)
bb_error_msg_and_die("bad IPv6 address '%s'", str_r);
requested_ipv6 = &ipv6_buf;
}
}
#if ENABLE_FEATURE_UDHCP_PORT
if (opt & OPT_P) {
@@ -1466,6 +1502,8 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
if (packet.d6_msg_type == D6_MSG_REPLY) {
uint32_t lease_seconds;
struct d6_option *option, *iaaddr;
int address_timeout = 0;
int prefix_timeout = 0;
type_is_ok:
option = d6_find_option(packet.d6_options, packet_end, D6_OPT_STATUS_CODE);
if (option && (option->data[0] | option->data[1]) != 0) {
@@ -1589,6 +1627,7 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
* . .
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if (option_mask32 & OPT_r) {
free(client6_data.ia_na);
client6_data.ia_na = d6_copy_option(packet.d6_options, packet_end, D6_OPT_IA_NA);
if (!client6_data.ia_na) {
@@ -1624,9 +1663,48 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
if (lease_seconds > 0x7fffffff / 1000)
lease_seconds = 0x7fffffff / 1000;
/* enter bound state */
timeout = lease_seconds / 2;
address_timeout = lease_seconds / 2;
bb_error_msg("lease obtained, lease time %u",
/*inet_ntoa(temp_addr),*/ (unsigned)lease_seconds);
}
if (option_mask32 & OPT_d) {
struct d6_option *iaprefix;
free(client6_data.ia_pd);
client6_data.ia_pd = d6_copy_option(packet.d6_options, packet_end, D6_OPT_IA_PD);
if (!client6_data.ia_pd) {
bb_error_msg("no %s option, ignoring packet", "IA_PD");
continue;
}
if (client6_data.ia_pd->len < (4 + 4 + 4) + (2 + 2 + 4 + 4 + 1 + 16)) {
bb_error_msg("IA_PD option is too short:%d bytes", client6_data.ia_pd->len);
continue;
}
iaprefix = d6_find_option(client6_data.ia_pd->data + 4 + 4 + 4,
client6_data.ia_pd->data + client6_data.ia_pd->len,
D6_OPT_IAPREFIX
);
if (!iaprefix) {
bb_error_msg("no %s option, ignoring packet", "IAPREFIX");
continue;
}
if (iaprefix->len < (4 + 4 + 1 + 16)) {
bb_error_msg("IAPREFIX option is too short:%d bytes", iaprefix->len);
continue;
}
move_from_unaligned32(lease_seconds, iaprefix->data + 4);
lease_seconds = ntohl(lease_seconds);
/* paranoia: must not be too small and not prone to overflows */
if (lease_seconds < 0x10)
lease_seconds = 0x10;
if (lease_seconds > 0x7fffffff / 1000)
lease_seconds = 0x7fffffff / 1000;
/* enter bound state */
prefix_timeout = lease_seconds / 2;
bb_error_msg("prefix obtained, lease time %u",
/*inet_ntoa(temp_addr),*/ (unsigned)lease_seconds);
}
timeout = address_timeout > prefix_timeout ? prefix_timeout : address_timeout;
d6_run_script(&packet, state == REQUESTING ? "bound" : "renew");
state = BOUND;