Adding upstream version 255.4.upstream/255.4

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

1 files changed, 206 insertions, 0 deletions

diff --git a/src/shared/netif-util.c b/src/shared/netif-util.c
new file mode 100644
index 0000000..f56c564
--- /dev/null
+++ b/src/shared/netif-util.c
@@ -0,0 +1,206 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <linux/if.h>
+#include <linux/if_arp.h>
+
+#include "arphrd-util.h"
+#include "device-util.h"
+#include "log-link.h"
+#include "memory-util.h"
+#include "netif-util.h"
+#include "siphash24.h"
+#include "sparse-endian.h"
+#include "strv.h"
+
+bool netif_has_carrier(uint8_t operstate, unsigned flags) {
+        /* see Documentation/networking/operstates.txt in the kernel sources */
+
+        if (operstate == IF_OPER_UP)
+                return true;
+
+        if (operstate != IF_OPER_UNKNOWN)
+                return false;
+
+        /* operstate may not be implemented, so fall back to flags */
+        return FLAGS_SET(flags, IFF_LOWER_UP | IFF_RUNNING) &&
+                !FLAGS_SET(flags, IFF_DORMANT);
+}
+
+int net_get_type_string(sd_device *device, uint16_t iftype, char **ret) {
+        const char *t;
+        char *p;
+
+        if (device &&
+            sd_device_get_devtype(device, &t) >= 0 &&
+            !isempty(t)) {
+                p = strdup(t);
+                if (!p)
+                        return -ENOMEM;
+
+                *ret = p;
+                return 0;
+        }
+
+        t = arphrd_to_name(iftype);
+        if (!t)
+                return -ENOENT;
+
+        p = strdup(t);
+        if (!p)
+                return -ENOMEM;
+
+        *ret = ascii_strlower(p);
+        return 0;
+}
+
+const char *net_get_persistent_name(sd_device *device) {
+        assert(device);
+
+        /* fetch some persistent data unique (on this machine) to this device */
+        FOREACH_STRING(field, "ID_NET_NAME_ONBOARD", "ID_NET_NAME_SLOT", "ID_NET_NAME_PATH", "ID_NET_NAME_MAC") {
+                const char *name;
+
+                if (sd_device_get_property_value(device, field, &name) >= 0)
+                        return name;
+        }
+
+        return NULL;
+}
+
+/* Used when generating hardware address by udev, and IPv4LL seed by networkd. */
+#define HASH_KEY SD_ID128_MAKE(d3,1e,48,fa,90,fe,4b,4c,9d,af,d5,d7,a1,b1,2e,8a)
+
+int net_get_unique_predictable_data(sd_device *device, bool use_sysname, uint64_t *ret) {
+        const char *name;
+
+        assert(device);
+        assert(ret);
+
+        /* net_get_persistent_name() will return one of the device names based on stable information about
+         * the device. If this is not available, we fall back to using the actual device name. */
+        name = net_get_persistent_name(device);
+        if (!name && use_sysname)
+                (void) sd_device_get_sysname(device, &name);
+        if (!name)
+                return log_device_debug_errno(device, SYNTHETIC_ERRNO(ENODATA),
+                                              "No stable identifying information found");
+
+        log_device_debug(device, "Using \"%s\" as stable identifying information", name);
+
+        return net_get_unique_predictable_data_from_name(name, &HASH_KEY, ret);
+}
+
+int net_get_unique_predictable_data_from_name(
+                const char *name,
+                const sd_id128_t *key,
+                uint64_t *ret) {
+
+        size_t l, sz;
+        uint8_t *v;
+        int r;
+
+        assert(name);
+        assert(key);
+        assert(ret);
+
+        l = strlen(name);
+        sz = sizeof(sd_id128_t) + l;
+        v = newa(uint8_t, sz);
+
+        /* Fetch some persistent data unique to this machine */
+        r = sd_id128_get_machine((sd_id128_t*) v);
+        if (r < 0)
+                 return r;
+
+        memcpy(v + sizeof(sd_id128_t), name, l);
+
+        /* Let's hash the machine ID plus the device name. We use
+         * a fixed, but originally randomly created hash key here. */
+        *ret = htole64(siphash24(v, sz, key->bytes));
+        return 0;
+}
+
+typedef struct Link {
+        const char *ifname;
+} Link;
+
+int net_verify_hardware_address(
+                const char *ifname,
+                bool is_static,
+                uint16_t iftype,
+                const struct hw_addr_data *ib_hw_addr, /* current or parent HW address */
+                struct hw_addr_data *new_hw_addr) {
+
+        Link link = { .ifname = ifname };
+
+        assert(new_hw_addr);
+
+        if (new_hw_addr->length == 0)
+                return 0;
+
+        if (new_hw_addr->length != arphrd_to_hw_addr_len(iftype)) {
+                if (is_static)
+                        log_link_warning(&link,
+                                         "Specified MAC address with invalid length (%zu, expected %zu), refusing.",
+                                         new_hw_addr->length, arphrd_to_hw_addr_len(iftype));
+                return -EINVAL;
+        }
+
+        switch (iftype) {
+        case ARPHRD_ETHER:
+                /* see eth_random_addr() in the kernel */
+
+                if (ether_addr_is_null(&new_hw_addr->ether)) {
+                        if (is_static)
+                                log_link_warning(&link, "Specified MAC address is null, refusing.");
+                        return -EINVAL;
+                }
+
+                if (ether_addr_is_broadcast(&new_hw_addr->ether)) {
+                        if (is_static)
+                                log_link_warning(&link, "Specified MAC address is broadcast, refusing.");
+                        return -EINVAL;
+                }
+
+                if (ether_addr_is_multicast(&new_hw_addr->ether)) {
+                        if (is_static)
+                                log_link_warning(&link, "Specified MAC address has the multicast bit set, clearing the bit.");
+
+                        new_hw_addr->bytes[0] &= 0xfe;
+                }
+
+                if (!is_static && !ether_addr_is_local(&new_hw_addr->ether))
+                        /* Adjust local assignment bit when the MAC address is generated randomly. */
+                        new_hw_addr->bytes[0] |= 0x02;
+
+                break;
+
+        case ARPHRD_INFINIBAND:
+                /* see ipoib_check_lladdr() in the kernel */
+
+                assert(ib_hw_addr);
+                assert(ib_hw_addr->length == INFINIBAND_ALEN);
+
+                if (is_static &&
+                    (!memeqzero(new_hw_addr->bytes, INFINIBAND_ALEN - 8) ||
+                     memcmp(new_hw_addr->bytes, ib_hw_addr->bytes, INFINIBAND_ALEN - 8) != 0))
+                        log_link_warning(&link, "Only the last 8 bytes of the InifniBand MAC address can be changed, ignoring the first 12 bytes.");
+
+                if (memeqzero(new_hw_addr->bytes + INFINIBAND_ALEN - 8, 8)) {
+                        if (is_static)
+                                log_link_warning(&link, "The last 8 bytes of the InfiniBand MAC address cannot be null, refusing.");
+                        return -EINVAL;
+                }
+
+                memcpy(new_hw_addr->bytes, ib_hw_addr->bytes, INFINIBAND_ALEN - 8);
+                break;
+
+        default:
+                if (is_static)
+                        log_link_warning(&link, "Unsupported interface type %s%u to set MAC address, refusing.",
+                                         strna(arphrd_to_name(iftype)), iftype);
+                return -EINVAL;
+        }
+
+        return 0;
+}