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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <linux/if_infiniband.h>
#include <net/ethernet.h>
#include <net/if_arp.h>
#include "sd-device.h"
#include "sd-id128.h"
#include "dhcp-identifier.h"
#include "netif-util.h"
#include "siphash24.h"
#include "sparse-endian.h"
#include "string-table.h"
#include "udev-util.h"
#define HASH_KEY SD_ID128_MAKE(80,11,8c,c2,fe,4a,03,ee,3e,d6,0c,6f,36,39,14,09)
#define APPLICATION_ID SD_ID128_MAKE(a5,0a,d1,12,bf,60,45,77,a2,fb,74,1a,b1,95,5b,03)
#define USEC_2000 ((usec_t) 946684800000000) /* 2000-01-01 00:00:00 UTC */
static const char * const duid_type_table[_DUID_TYPE_MAX] = {
[DUID_TYPE_LLT] = "DUID-LLT",
[DUID_TYPE_EN] = "DUID-EN/Vendor",
[DUID_TYPE_LL] = "DUID-LL",
[DUID_TYPE_UUID] = "UUID",
};
DEFINE_STRING_TABLE_LOOKUP_TO_STRING(duid_type, DUIDType);
int dhcp_validate_duid_len(DUIDType duid_type, size_t duid_len, bool strict) {
struct duid d;
assert_cc(sizeof(d.raw) >= MAX_DUID_LEN);
if (duid_len > MAX_DUID_LEN)
return -EINVAL;
if (!strict)
/* Strict validation is not requested. We only ensure that the
* DUID is not too long. */
return 0;
switch (duid_type) {
case DUID_TYPE_LLT:
if (duid_len <= sizeof(d.llt))
return -EINVAL;
break;
case DUID_TYPE_EN:
if (duid_len != sizeof(d.en))
return -EINVAL;
break;
case DUID_TYPE_LL:
if (duid_len <= sizeof(d.ll))
return -EINVAL;
break;
case DUID_TYPE_UUID:
if (duid_len != sizeof(d.uuid))
return -EINVAL;
break;
default:
/* accept unknown type in order to be forward compatible */
break;
}
return 0;
}
static int dhcp_identifier_set_duid_llt(
const struct hw_addr_data *hw_addr,
uint16_t arp_type,
usec_t t,
struct duid *ret_duid,
size_t *ret_len) {
uint16_t time_from_2000y;
assert(hw_addr);
assert(ret_duid);
assert(ret_len);
if (hw_addr->length == 0)
return -EOPNOTSUPP;
if (arp_type == ARPHRD_ETHER)
assert_return(hw_addr->length == ETH_ALEN, -EINVAL);
else if (arp_type == ARPHRD_INFINIBAND)
assert_return(hw_addr->length == INFINIBAND_ALEN, -EINVAL);
else
return -EOPNOTSUPP;
if (t < USEC_2000)
time_from_2000y = 0;
else
time_from_2000y = (uint16_t) (((t - USEC_2000) / USEC_PER_SEC) & 0xffffffff);
unaligned_write_be16(&ret_duid->type, DUID_TYPE_LLT);
unaligned_write_be16(&ret_duid->llt.htype, arp_type);
unaligned_write_be32(&ret_duid->llt.time, time_from_2000y);
memcpy(ret_duid->llt.haddr, hw_addr->bytes, hw_addr->length);
*ret_len = offsetof(struct duid, llt.haddr) + hw_addr->length;
return 0;
}
static int dhcp_identifier_set_duid_ll(
const struct hw_addr_data *hw_addr,
uint16_t arp_type,
struct duid *ret_duid,
size_t *ret_len) {
assert(hw_addr);
assert(ret_duid);
assert(ret_len);
if (hw_addr->length == 0)
return -EOPNOTSUPP;
if (arp_type == ARPHRD_ETHER)
assert_return(hw_addr->length == ETH_ALEN, -EINVAL);
else if (arp_type == ARPHRD_INFINIBAND)
assert_return(hw_addr->length == INFINIBAND_ALEN, -EINVAL);
else
return -EOPNOTSUPP;
unaligned_write_be16(&ret_duid->type, DUID_TYPE_LL);
unaligned_write_be16(&ret_duid->ll.htype, arp_type);
memcpy(ret_duid->ll.haddr, hw_addr->bytes, hw_addr->length);
*ret_len = offsetof(struct duid, ll.haddr) + hw_addr->length;
return 0;
}
int dhcp_identifier_set_duid_en(bool test_mode, struct duid *ret_duid, size_t *ret_len) {
sd_id128_t machine_id;
uint64_t hash;
int r;
assert(ret_duid);
assert(ret_len);
if (!test_mode) {
r = sd_id128_get_machine(&machine_id);
if (r < 0)
return r;
} else
/* For tests, especially for fuzzers, reproducibility is important.
* Hence, use a static and constant machine ID.
* See 9216fddc5a8ac2742e6cfa7660f95c20ca4f2193. */
machine_id = SD_ID128_MAKE(01, 02, 03, 04, 05, 06, 07, 08, 09, 0a, 0b, 0c, 0d, 0e, 0f, 10);
unaligned_write_be16(&ret_duid->type, DUID_TYPE_EN);
unaligned_write_be32(&ret_duid->en.pen, SYSTEMD_PEN);
/* a bit of snake-oil perhaps, but no need to expose the machine-id
* directly; duid->en.id might not be aligned, so we need to copy */
hash = htole64(siphash24(&machine_id, sizeof(machine_id), HASH_KEY.bytes));
memcpy(ret_duid->en.id, &hash, sizeof(ret_duid->en.id));
*ret_len = offsetof(struct duid, en.id) + sizeof(ret_duid->en.id);
if (test_mode)
assert_se(memcmp(ret_duid, (const uint8_t[]) { 0x00, 0x02, 0x00, 0x00, 0xab, 0x11, 0x61, 0x77, 0x40, 0xde, 0x13, 0x42, 0xc3, 0xa2 }, *ret_len) == 0);
return 0;
}
static int dhcp_identifier_set_duid_uuid(struct duid *ret_duid, size_t *ret_len) {
sd_id128_t machine_id;
int r;
assert(ret_duid);
assert(ret_len);
r = sd_id128_get_machine_app_specific(APPLICATION_ID, &machine_id);
if (r < 0)
return r;
unaligned_write_be16(&ret_duid->type, DUID_TYPE_UUID);
memcpy(&ret_duid->uuid.uuid, &machine_id, sizeof(machine_id));
*ret_len = offsetof(struct duid, uuid.uuid) + sizeof(machine_id);
return 0;
}
int dhcp_identifier_set_duid(
DUIDType duid_type,
const struct hw_addr_data *hw_addr,
uint16_t arp_type,
usec_t llt_time,
bool test_mode,
struct duid *ret_duid,
size_t *ret_len) {
switch (duid_type) {
case DUID_TYPE_LLT:
return dhcp_identifier_set_duid_llt(hw_addr, arp_type, llt_time, ret_duid, ret_len);
case DUID_TYPE_EN:
return dhcp_identifier_set_duid_en(test_mode, ret_duid, ret_len);
case DUID_TYPE_LL:
return dhcp_identifier_set_duid_ll(hw_addr, arp_type, ret_duid, ret_len);
case DUID_TYPE_UUID:
return dhcp_identifier_set_duid_uuid(ret_duid, ret_len);
default:
return -EINVAL;
}
}
int dhcp_identifier_set_iaid(
int ifindex,
const struct hw_addr_data *hw_addr,
bool legacy_unstable_byteorder,
bool use_mac,
void *ret) {
/* name is a pointer to memory in the sd_device struct, so must
* have the same scope */
_cleanup_(sd_device_unrefp) sd_device *device = NULL;
const char *name = NULL;
uint32_t id32;
uint64_t id;
int r;
assert(ifindex > 0);
assert(hw_addr);
assert(ret);
if (udev_available() && !use_mac) {
/* udev should be around */
r = sd_device_new_from_ifindex(&device, ifindex);
if (r < 0)
return r;
r = sd_device_get_is_initialized(device);
if (r < 0)
return r;
if (r == 0)
/* not yet ready */
return -EBUSY;
r = device_is_renaming(device);
if (r < 0)
return r;
if (r > 0)
/* device is under renaming */
return -EBUSY;
name = net_get_persistent_name(device);
}
if (name)
id = siphash24(name, strlen(name), HASH_KEY.bytes);
else
/* fall back to MAC address if no predictable name available */
id = siphash24(hw_addr->bytes, hw_addr->length, HASH_KEY.bytes);
id32 = (id & 0xffffffff) ^ (id >> 32);
if (legacy_unstable_byteorder)
/* for historical reasons (a bug), the bits were swapped and thus
* the result was endianness dependent. Preserve that behavior. */
id32 = bswap_32(id32);
else
/* the fixed behavior returns a stable byte order. Since LE is expected
* to be more common, swap the bytes on LE to give the same as legacy
* behavior. */
id32 = be32toh(id32);
unaligned_write_ne32(ret, id32);
return 0;
}
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