0d5eb02134
libsystemd-network: split network-internal.c
217 lines
7 KiB
C
217 lines
7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <linux/if_infiniband.h>
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#include <net/ethernet.h>
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#include <net/if_arp.h>
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#include "sd-device.h"
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#include "sd-id128.h"
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#include "dhcp-identifier.h"
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#include "dhcp6-protocol.h"
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#include "network-util.h"
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#include "siphash24.h"
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#include "sparse-endian.h"
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#include "stdio-util.h"
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#include "udev-util.h"
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#include "virt.h"
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#define HASH_KEY SD_ID128_MAKE(80,11,8c,c2,fe,4a,03,ee,3e,d6,0c,6f,36,39,14,09)
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#define APPLICATION_ID SD_ID128_MAKE(a5,0a,d1,12,bf,60,45,77,a2,fb,74,1a,b1,95,5b,03)
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#define USEC_2000 ((usec_t) 946684800000000) /* 2000-01-01 00:00:00 UTC */
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int dhcp_validate_duid_len(uint16_t duid_type, size_t duid_len, bool strict) {
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struct duid d;
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assert_cc(sizeof(d.raw) >= MAX_DUID_LEN);
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if (duid_len > MAX_DUID_LEN)
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return -EINVAL;
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if (!strict)
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/* Strict validation is not requested. We only ensure that the
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* DUID is not too long. */
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return 0;
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switch (duid_type) {
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case DUID_TYPE_LLT:
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if (duid_len <= sizeof(d.llt))
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return -EINVAL;
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break;
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case DUID_TYPE_EN:
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if (duid_len != sizeof(d.en))
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return -EINVAL;
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break;
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case DUID_TYPE_LL:
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if (duid_len <= sizeof(d.ll))
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return -EINVAL;
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break;
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case DUID_TYPE_UUID:
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if (duid_len != sizeof(d.uuid))
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return -EINVAL;
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break;
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default:
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/* accept unknown type in order to be forward compatible */
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break;
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}
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return 0;
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}
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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) {
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uint16_t time_from_2000y;
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assert(duid);
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assert(len);
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assert(addr);
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if (arp_type == ARPHRD_ETHER)
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assert_return(addr_len == ETH_ALEN, -EINVAL);
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else if (arp_type == ARPHRD_INFINIBAND)
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assert_return(addr_len == INFINIBAND_ALEN, -EINVAL);
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else
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return -EINVAL;
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if (t < USEC_2000)
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time_from_2000y = 0;
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else
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time_from_2000y = (uint16_t) (((t - USEC_2000) / USEC_PER_SEC) & 0xffffffff);
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unaligned_write_be16(&duid->type, DUID_TYPE_LLT);
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unaligned_write_be16(&duid->llt.htype, arp_type);
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unaligned_write_be32(&duid->llt.time, time_from_2000y);
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memcpy(duid->llt.haddr, addr, addr_len);
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*len = sizeof(duid->type) + sizeof(duid->llt.htype) + sizeof(duid->llt.time) + addr_len;
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return 0;
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}
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int dhcp_identifier_set_duid_ll(struct duid *duid, const uint8_t *addr, size_t addr_len, uint16_t arp_type, size_t *len) {
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assert(duid);
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assert(len);
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assert(addr);
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if (arp_type == ARPHRD_ETHER)
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assert_return(addr_len == ETH_ALEN, -EINVAL);
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else if (arp_type == ARPHRD_INFINIBAND)
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assert_return(addr_len == INFINIBAND_ALEN, -EINVAL);
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else
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return -EINVAL;
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unaligned_write_be16(&duid->type, DUID_TYPE_LL);
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unaligned_write_be16(&duid->ll.htype, arp_type);
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memcpy(duid->ll.haddr, addr, addr_len);
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*len = sizeof(duid->type) + sizeof(duid->ll.htype) + addr_len;
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return 0;
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}
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int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len) {
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sd_id128_t machine_id;
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uint64_t hash;
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int r;
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assert(duid);
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assert(len);
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r = sd_id128_get_machine(&machine_id);
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if (r < 0) {
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#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
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machine_id = SD_ID128_MAKE(01, 02, 03, 04, 05, 06, 07, 08, 09, 0a, 0b, 0c, 0d, 0e, 0f, 10);
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#else
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return r;
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#endif
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}
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unaligned_write_be16(&duid->type, DUID_TYPE_EN);
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unaligned_write_be32(&duid->en.pen, SYSTEMD_PEN);
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*len = sizeof(duid->type) + sizeof(duid->en);
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/* a bit of snake-oil perhaps, but no need to expose the machine-id
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* directly; duid->en.id might not be aligned, so we need to copy */
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hash = htole64(siphash24(&machine_id, sizeof(machine_id), HASH_KEY.bytes));
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memcpy(duid->en.id, &hash, sizeof(duid->en.id));
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return 0;
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}
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int dhcp_identifier_set_duid_uuid(struct duid *duid, size_t *len) {
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sd_id128_t machine_id;
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int r;
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assert(duid);
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assert(len);
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r = sd_id128_get_machine_app_specific(APPLICATION_ID, &machine_id);
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if (r < 0)
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return r;
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unaligned_write_be16(&duid->type, DUID_TYPE_UUID);
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memcpy(&duid->raw.data, &machine_id, sizeof(machine_id));
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*len = sizeof(duid->type) + sizeof(machine_id);
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return 0;
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}
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int dhcp_identifier_set_iaid(
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int ifindex,
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const uint8_t *mac,
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size_t mac_len,
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bool legacy_unstable_byteorder,
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void *_id) {
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/* name is a pointer to memory in the sd_device struct, so must
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* have the same scope */
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_cleanup_(sd_device_unrefp) sd_device *device = NULL;
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const char *name = NULL;
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uint64_t id;
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uint32_t id32;
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if (detect_container() <= 0) {
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/* not in a container, udev will be around */
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char ifindex_str[1 + DECIMAL_STR_MAX(int)];
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int r;
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xsprintf(ifindex_str, "n%d", ifindex);
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if (sd_device_new_from_device_id(&device, ifindex_str) >= 0) {
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r = sd_device_get_is_initialized(device);
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if (r < 0)
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return r;
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if (r == 0)
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/* not yet ready */
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return -EBUSY;
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r = device_is_renaming(device);
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if (r < 0)
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return r;
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if (r > 0)
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/* device is under renaming */
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return -EBUSY;
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name = net_get_name_persistent(device);
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}
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}
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if (name)
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id = siphash24(name, strlen(name), HASH_KEY.bytes);
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else
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/* fall back to MAC address if no predictable name available */
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id = siphash24(mac, mac_len, HASH_KEY.bytes);
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id32 = (id & 0xffffffff) ^ (id >> 32);
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if (legacy_unstable_byteorder)
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/* for historical reasons (a bug), the bits were swapped and thus
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* the result was endianness dependent. Preserve that behavior. */
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id32 = __bswap_32(id32);
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else
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/* the fixed behavior returns a stable byte order. Since LE is expected
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* to be more common, swap the bytes on LE to give the same as legacy
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* behavior. */
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id32 = be32toh(id32);
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unaligned_write_ne32(_id, id32);
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return 0;
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}
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