113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include "libudev.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-internal.h"
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#include "siphash24.h"
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#include "sparse-endian.h"
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#include "udev-util.h"
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#include "virt.h"
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#define SYSTEMD_PEN 43793
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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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int dhcp_validate_duid_len(uint16_t duid_type, size_t duid_len) {
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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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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_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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return r;
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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_iaid(int ifindex, uint8_t *mac, size_t mac_len, void *_id) {
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/* name is a pointer to memory in the udev_device struct, so must
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have the same scope */
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_cleanup_(udev_device_unrefp) struct udev_device *device = NULL;
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const char *name = NULL;
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uint64_t id;
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if (detect_container() <= 0) {
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/* not in a container, udev will be around */
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_cleanup_(udev_unrefp) struct udev *udev;
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char ifindex_str[2 + DECIMAL_STR_MAX(int)];
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udev = udev_new();
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if (!udev)
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return -ENOMEM;
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sprintf(ifindex_str, "n%d", ifindex);
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device = udev_device_new_from_device_id(udev, ifindex_str);
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if (device) {
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if (udev_device_get_is_initialized(device) <= 0)
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/* not yet ready */
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return -EBUSY;
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name = net_get_name(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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id = htole64(id);
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/* fold into 32 bits */
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unaligned_write_be32(_id, (id & 0xffffffff) ^ (id >> 32));
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return 0;
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}
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