Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 209 insertions, 0 deletions

diff --git a/src/libsystemd-network/dhcp-identifier.c b/src/libsystemd-network/dhcp-identifier.c
new file mode 100644
index 0000000..f65cdbe
--- /dev/null
+++ b/src/libsystemd-network/dhcp-identifier.c
@@ -0,0 +1,209 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <linux/if_infiniband.h>
+#include <net/ethernet.h>
+#include <net/if_arp.h>
+
+#include "dhcp-identifier.h"
+#include "netif-util.h"
+#include "network-common.h"
+#include "siphash24.h"
+#include "sparse-endian.h"
+#include "string-table.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_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;
+}
+
+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(struct duid *ret_duid, size_t *ret_len) {
+        sd_id128_t machine_id;
+        bool test_mode;
+        uint64_t hash;
+        int r;
+
+        assert(ret_duid);
+        assert(ret_len);
+
+        test_mode = network_test_mode_enabled();
+
+        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(hash));
+
+        *ret_len = offsetof(struct duid, en.id) + sizeof(hash);
+
+        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;
+}
+
+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_raw(
+                DUIDType duid_type,
+                const uint8_t *buf,
+                size_t buf_len,
+                struct duid *ret_duid,
+                size_t *ret_len) {
+
+        assert(buf || buf_len == 0);
+        assert(ret_duid);
+        assert(ret_len);
+
+        if (duid_type < 0 || duid_type > UINT16_MAX)
+                return -EINVAL;
+
+        if (buf_len > MAX_DUID_DATA_LEN)
+                return -EINVAL;
+
+        unaligned_write_be16(&ret_duid->type, duid_type);
+        memcpy_safe(ret_duid->raw.data, buf, buf_len);
+
+        *ret_len = offsetof(struct duid, raw.data) + buf_len;
+        return 0;
+}
+
+int dhcp_identifier_set_iaid(
+                sd_device *dev,
+                const struct hw_addr_data *hw_addr,
+                bool legacy_unstable_byteorder,
+                void *ret) {
+
+        const char *name = NULL;
+        uint32_t id32;
+        uint64_t id;
+
+        assert(hw_addr);
+        assert(ret);
+
+        if (dev)
+                name = net_get_persistent_name(dev);
+        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;
+}