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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <linux/if_infiniband.h>
#include <net/if_arp.h>
#include "sd-device.h"
#include "sd-id128.h"
#include "dhcp-identifier.h"
#include "dhcp6-protocol.h"
#include "network-internal.h"
#include "siphash24.h"
#include "sparse-endian.h"
#include "virt.h"
#define SYSTEMD_PEN 43793
#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 */
int dhcp_validate_duid_len(uint16_t 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;
}
int dhcp_identifier_set_duid_llt(struct duid *duid, usec_t t, const uint8_t *addr, size_t addr_len, uint16_t arp_type, size_t *len) {
uint16_t time_from_2000y;
assert(duid);
assert(len);
assert(addr);
if (arp_type == ARPHRD_ETHER)
assert_return(addr_len == ETH_ALEN, -EINVAL);
else if (arp_type == ARPHRD_INFINIBAND)
assert_return(addr_len == INFINIBAND_ALEN, -EINVAL);
else
return -EINVAL;
if (t < USEC_2000)
time_from_2000y = 0;
else
time_from_2000y = (uint16_t) (((t - USEC_2000) / USEC_PER_SEC) & 0xffffffff);
unaligned_write_be16(&duid->type, DUID_TYPE_LLT);
unaligned_write_be16(&duid->llt.htype, arp_type);
unaligned_write_be32(&duid->llt.time, time_from_2000y);
memcpy(duid->llt.haddr, addr, addr_len);
*len = sizeof(duid->type) + sizeof(duid->llt.htype) + sizeof(duid->llt.time) + addr_len;
return 0;
}
int dhcp_identifier_set_duid_ll(struct duid *duid, const uint8_t *addr, size_t addr_len, uint16_t arp_type, size_t *len) {
assert(duid);
assert(len);
assert(addr);
if (arp_type == ARPHRD_ETHER)
assert_return(addr_len == ETH_ALEN, -EINVAL);
else if (arp_type == ARPHRD_INFINIBAND)
assert_return(addr_len == INFINIBAND_ALEN, -EINVAL);
else
return -EINVAL;
unaligned_write_be16(&duid->type, DUID_TYPE_LL);
unaligned_write_be16(&duid->ll.htype, arp_type);
memcpy(duid->ll.haddr, addr, addr_len);
*len = sizeof(duid->type) + sizeof(duid->ll.htype) + addr_len;
return 0;
}
int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len) {
sd_id128_t machine_id;
uint64_t hash;
int r;
assert(duid);
assert(len);
r = sd_id128_get_machine(&machine_id);
if (r < 0) {
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
machine_id = SD_ID128_MAKE(01, 02, 03, 04, 05, 06, 07, 08, 09, 0a, 0b, 0c, 0d, 0e, 0f, 10);
#else
return r;
#endif
}
unaligned_write_be16(&duid->type, DUID_TYPE_EN);
unaligned_write_be32(&duid->en.pen, SYSTEMD_PEN);
*len = sizeof(duid->type) + sizeof(duid->en);
/* 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(duid->en.id, &hash, sizeof(duid->en.id));
return 0;
}
int dhcp_identifier_set_duid_uuid(struct duid *duid, size_t *len) {
sd_id128_t machine_id;
int r;
assert(duid);
assert(len);
r = sd_id128_get_machine_app_specific(APPLICATION_ID, &machine_id);
if (r < 0)
return r;
unaligned_write_be16(&duid->type, DUID_TYPE_UUID);
memcpy(&duid->raw.data, &machine_id, sizeof(machine_id));
*len = sizeof(duid->type) + sizeof(machine_id);
return 0;
}
int dhcp_identifier_set_iaid(
int ifindex,
const uint8_t *mac,
size_t mac_len,
bool legacy_unstable_byteorder,
void *_id) {
/* 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;
uint64_t id;
uint32_t id32;
if (detect_container() <= 0) {
/* not in a container, udev will be around */
char ifindex_str[2 + DECIMAL_STR_MAX(int)];
int r;
sprintf(ifindex_str, "n%d", ifindex);
if (sd_device_new_from_device_id(&device, ifindex_str) >= 0) {
r = sd_device_get_is_initialized(device);
if (r < 0)
return r;
if (r == 0)
/* not yet ready */
return -EBUSY;
name = net_get_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(mac, mac_len, 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 dependant. 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(_id, id32);
return 0;
}
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