/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include "nm-sd-adapt-core.h" #include #include #include #include "sd-device.h" #include "sd-id128.h" #include "dhcp-identifier.h" #include "dhcp6-protocol.h" #include "network-util.h" #include "siphash24.h" #include "sparse-endian.h" #include "stdio-util.h" #include "udev-util.h" #include "virt.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 */ 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; } #if 0 /* NM_IGNORED */ 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; } #endif /* NM_IGNORED */ 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; } #if 0 /* NM_IGNORED */ 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; } #endif int dhcp_identifier_set_iaid( int ifindex, const uint8_t *mac, size_t mac_len, bool legacy_unstable_byteorder, void *_id) { #if 0 /* NM_IGNORED */ /* 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[1 + DECIMAL_STR_MAX(int)]; int r; xsprintf(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; r = device_is_renaming(device); if (r < 0) return r; if (r > 0) /* device is under renaming */ return -EBUSY; name = net_get_name_persistent(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 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(_id, id32); return 0; #else /* NM_IGNORED */ /* for NetworkManager, we don't use this function and we should never call here. * This got replaced by nm_utils_create_dhcp_iaid(). */ g_return_val_if_reached (-EINVAL); #endif /* NM_IGNORED */ }