along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include "link-config.h"
+#include <netinet/ether.h>
+#include <net/if.h>
+
+#include "sd-id128.h"
+#include "link-config.h"
#include "ethtool-util.h"
+#include "libudev-private.h"
+#include "sd-rtnl.h"
#include "util.h"
#include "log.h"
#include "strv.h"
#include "path-util.h"
#include "conf-parser.h"
#include "conf-files.h"
+#include "fileio.h"
+#include "hashmap.h"
struct link_config_ctx {
LIST_HEAD(link_config, links);
int ethtool_fd;
+ sd_rtnl *rtnl;
+
char **link_dirs;
usec_t *link_dirs_ts_usec;
};
return r;
}
+ r = sd_rtnl_open(0, &ctx->rtnl);
+ if (r < 0) {
+ link_config_ctx_free(ctx);
+ return r;
+ }
+
LIST_HEAD_INIT(ctx->links);
- ctx->link_dirs = strv_new("/etc/net/links",
- "/run/net/links",
- "/usr/lib/net/links",
+ ctx->link_dirs = strv_new("/etc/systemd/network",
+ "/run/systemd/network",
+ "/usr/lib/systemd/network",
NULL);
if (!ctx->link_dirs) {
log_error("failed to build link config directory array");
if (!ctx)
return;
- close_nointr_nofail(ctx->ethtool_fd);
+ if (ctx->ethtool_fd >= 0)
+ close_nointr_nofail(ctx->ethtool_fd);
+
+ sd_rtnl_unref(ctx->rtnl);
+
strv_free(ctx->link_dirs);
free(ctx->link_dirs_ts_usec);
link_configs_free(ctx);
return -ENOENT;
}
+static int rtnl_set_properties(sd_rtnl *rtnl, int ifindex, const char *name, const struct ether_addr *mac, unsigned int mtu) {
+ _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message;
+ bool need_update = false;
+ int r;
+
+ assert(rtnl);
+ assert(ifindex > 0);
+
+ r = sd_rtnl_message_link_new(RTM_NEWLINK, ifindex, 0, 0, &message);
+ if (r < 0)
+ return r;
+
+ if (name) {
+ r = sd_rtnl_message_append(message, IFLA_IFNAME, name);
+ if (r < 0)
+ return r;
+
+ need_update = true;
+ }
+
+ if (mac) {
+ r = sd_rtnl_message_append(message, IFLA_ADDRESS, mac);
+ if (r < 0)
+ return r;
+
+ need_update = true;
+ }
+
+ if (mtu > 0) {
+ r = sd_rtnl_message_append(message, IFLA_MTU, &mtu);
+ if (r < 0)
+ return r;
+
+ need_update = true;
+ }
+
+ if (need_update) {
+ r = sd_rtnl_send_with_reply_and_block(rtnl, message, 5 * USEC_PER_SEC, NULL);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static bool enable_name_policy(void) {
+ _cleanup_free_ char *line;
+ char *w, *state;
+ int r;
+ size_t l;
+
+ r = read_one_line_file("/proc/cmdline", &line);
+ if (r < 0) {
+ log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
+ return true; /* something is very wrong, let's not make it worse */
+ }
+
+ FOREACH_WORD_QUOTED(w, l, line, state)
+ if (strneq(w, "net.ifnames=0", l))
+ return false;
+
+ return true;
+}
+
+static bool mac_is_random(struct udev_device *device) {
+ const char *s;
+ int type;
+
+ s = udev_device_get_sysattr_value(device, "addr_assign_type");
+ if (!s)
+ return -EINVAL;
+ type = strtoul(s, NULL, 0);
+
+ /* check for NET_ADDR_RANDOM */
+ return type == 1;
+}
+
+static bool mac_is_permanent(struct udev_device *device) {
+ const char *s;
+ int type;
+
+ s = udev_device_get_sysattr_value(device, "addr_assign_type");
+ if (!s)
+ return -EINVAL;
+ type = strtoul(s, NULL, 0);
+
+ /* check for NET_ADDR_PERM */
+ return type == 0;
+}
+
+static int get_mac(struct udev_device *device, bool want_random, struct ether_addr **ret) {
+ struct ether_addr *mac;
+ unsigned int seed;
+ int r, i;
+
+ mac = calloc(1, sizeof(struct ether_addr));
+ if (!mac)
+ return -ENOMEM;
+
+ if (want_random)
+ seed = random_u();
+ else {
+ const char *name;
+ sd_id128_t machine;
+ char machineid_buf[33];
+ const char *seed_str;
+
+ /* fetch some persistent data unique (on this machine) to this device */
+ name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
+ if (!name) {
+ name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
+ if (!name) {
+ name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
+ if (!name)
+ return -1;
+ }
+ }
+ /* fetch some persistent data unique to this machine */
+ r = sd_id128_get_machine(&machine);
+ if (r < 0)
+ return -1;
+
+ /* combine the data */
+ seed_str = strappenda(name, sd_id128_to_string(machine, machineid_buf));
+
+ /* hash to get seed */
+ seed = string_hash_func(seed_str);
+ }
+
+ srandom(seed);
+
+ for(i = 0; i < ETH_ALEN; i++) {
+ mac->ether_addr_octet[i] = random();
+ }
+
+ /* see eth_random_addr in the kernel */
+ mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
+ mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
+
+ *ret = mac;
+
+ return 0;
+}
+
int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device) {
const char *name;
- int r;
+ char *new_name = NULL;
+ struct ether_addr *mac = NULL;
+ int r, ifindex;
name = udev_device_get_sysname(device);
if (!name)
log_info("Set WakeOnLan of %s to %s", name, config->wol);
}
+ ifindex = udev_device_get_ifindex(device);
+ if (ifindex <= 0) {
+ log_warning("Could not find ifindex");
+ return -ENODEV;
+ }
+
+ if (config->name_policy && enable_name_policy()) {
+ char **policy;
+
+ STRV_FOREACH(policy, config->name_policy) {
+ if (streq(*policy, "onboard")) {
+ r = strdup_or_null(udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"), &new_name);
+ if (r < 0)
+ return r;
+ if (new_name)
+ break;
+ } else if (streq(*policy, "slot")) {
+ r = strdup_or_null(udev_device_get_property_value(device, "ID_NET_NAME_SLOT"), &new_name);
+ if (r < 0)
+ return r;
+ if (new_name)
+ break;
+ } else if (streq(*policy, "path")) {
+ r = strdup_or_null(udev_device_get_property_value(device, "ID_NET_NAME_PATH"), &new_name);
+ if (r < 0)
+ return r;
+ if (new_name)
+ break;
+ } else if (streq(*policy, "mac")) {
+ r = strdup_or_null(udev_device_get_property_value(device, "ID_NET_NAME_MAC"), &new_name);
+ if (r < 0)
+ return r;
+ if (new_name)
+ break;
+ } else
+ log_warning("Invalid link naming policy '%s', ignoring.", *policy);
+ }
+ }
+
+ if (!new_name && config->name) {
+ new_name = calloc(1, IFNAMSIZ);
+ strscpy(new_name, IFNAMSIZ, config->name);
+ }
+
+ if (config->mac_policy) {
+ if (streq(config->mac_policy, "persistent")) {
+ if (!mac_is_permanent(device)) {
+ r = get_mac(device, false, &mac);
+ if (r < 0)
+ return r;
+ }
+ } else if (streq(config->mac_policy, "random")) {
+ if (!mac_is_random(device)) {
+ r = get_mac(device, true, &mac);
+ if (r < 0)
+ return r;
+ }
+ } else
+ log_warning("Invalid MACAddress policy '%s', ignoring.", config->mac_policy);
+ }
+
+ if (!mac && config->mac) {
+ mac = calloc(1, sizeof(struct ether_addr));
+ r = sscanf(config->mac, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+ &mac->ether_addr_octet[0],
+ &mac->ether_addr_octet[1],
+ &mac->ether_addr_octet[2],
+ &mac->ether_addr_octet[3],
+ &mac->ether_addr_octet[4],
+ &mac->ether_addr_octet[5]);
+ if (r != 6) {
+ r = -EINVAL;
+ goto out;
+ }
+ }
+
+ r = rtnl_set_properties(ctx->rtnl, ifindex, new_name, mac, config->mtu);
+ if (r < 0) {
+ log_warning("Could not set Name, MACAddress or MTU on %s: %s", name, strerror(-r));
+ goto out;
+ }
+
return 0;
+out:
+ free(new_name);
+ free(mac);
+ return r;
}
~ianmdlvl / elogind.git / blobdiff