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"
+#include "rtnl-util.h"
struct link_config_ctx {
LIST_HEAD(link_config, links);
int ethtool_fd;
+ bool enable_name_policy;
+
+ sd_rtnl *rtnl;
+
char **link_dirs;
- usec_t *link_dirs_ts_usec;
+ usec_t link_dirs_ts_usec;
};
+DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free);
+#define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep)
+
int link_config_ctx_new(link_config_ctx **ret) {
- link_config_ctx *ctx;
- int r;
+ _cleanup_link_config_ctx_free_ link_config_ctx *ctx = NULL;
if (!ret)
return -EINVAL;
if (!ctx)
return -ENOMEM;
- r = ethtool_connect(&ctx->ethtool_fd);
- 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->ethtool_fd = -1;
+
+ ctx->enable_name_policy = true;
+
+ 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");
- link_config_ctx_free(ctx);
return -ENOMEM;
}
+
if (!path_strv_canonicalize_uniq(ctx->link_dirs)) {
log_error("failed to canonicalize link config directories\n");
- link_config_ctx_free(ctx);
- return -ENOMEM;
- }
-
- ctx->link_dirs_ts_usec = calloc(strv_length(ctx->link_dirs), sizeof(usec_t));
- if(!ctx->link_dirs_ts_usec) {
- link_config_ctx_free(ctx);
return -ENOMEM;
}
*ret = ctx;
+ ctx = NULL;
+
+ return 0;
+}
+
+static int link_config_ctx_connect(link_config_ctx *ctx) {
+ int r;
+
+ if (ctx->ethtool_fd >= 0 && ctx->rtnl)
+ return 0;
+
+ r = ethtool_connect(&ctx->ethtool_fd);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_open(0, &ctx->rtnl);
+ if (r < 0)
+ return r;
+
return 0;
}
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);
free(ctx);
goto failure;
}
+ link->mac_policy = _MACPOLICY_INVALID;
+ link->wol = _WOL_INVALID;
+ link->duplex = _DUP_INVALID;
+
+
r = config_parse(NULL, filename, file, "Match\0Link\0Ethernet\0", config_item_perf_lookup,
(void*) link_config_gperf_lookup, false, false, link);
if (r < 0) {
return r;
}
+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;
+}
+
int link_config_load(link_config_ctx *ctx) {
int r;
char **files, **f;
link_configs_free(ctx);
- /* update timestamps */
- paths_check_timestamp(ctx->link_dirs, ctx->link_dirs_ts_usec, true);
+
+ if (!enable_name_policy()) {
+ ctx->enable_name_policy = false;
+ log_info("Network interface NamePolicy= disabled on kernel commandline, ignoring.");
+ }
+
+ /* update timestamp */
+ paths_check_timestamp(ctx->link_dirs, &ctx->link_dirs_ts_usec, true);
r = conf_files_list_strv(&files, ".link", NULL, (const char **)ctx->link_dirs);
if (r < 0) {
}
bool link_config_should_reload(link_config_ctx *ctx) {
- return paths_check_timestamp(ctx->link_dirs, ctx->link_dirs_ts_usec, false);
+ return paths_check_timestamp(ctx->link_dirs, &ctx->link_dirs_ts_usec, false);
}
static bool match_config(link_config *match, struct udev_device *device) {
if (match->match_mac) {
property = udev_device_get_sysattr_value(device, "address");
- if (!property || !streq(match->match_mac, property)) {
- log_debug("Device MAC address (%s) did not match MACAddress=%s", property, match->match_mac);
+ if (!property || memcmp(match->match_mac, ether_aton(property), ETH_ALEN)) {
+ log_debug("Device MAC address (%s) did not match MACAddress=%s",
+ property, ether_ntoa(match->match_mac));
return 0;
}
}
if (match->match_path) {
property = udev_device_get_property_value(device, "ID_PATH");
- if (!property || !streq(match->match_path, property)) {
- log_debug("Device's persistent path (%s) did not match Path=%s", property, match->match_path);
+ if (!streq_ptr(match->match_path, property)) {
+ log_debug("Device's persistent path (%s) did not match Path=%s",
+ property, match->match_path);
return 0;
}
}
if (match->match_driver) {
property = udev_device_get_driver(device);
- if (!property || !streq(match->match_driver, property)) {
- log_debug("Device driver (%s) did not match Driver=%s", property, match->match_driver);
+ if (!streq_ptr(match->match_driver, property)) {
+ log_debug("Device driver (%s) did not match Driver=%s",
+ property, match->match_driver);
return 0;
}
}
if (match->match_type) {
property = udev_device_get_devtype(device);
- if (!property || !streq(match->match_type, property)) {
- log_debug("Device type (%s) did not match Type=%s", property, match->match_type);
+ if (!streq_ptr(match->match_type, property)) {
+ log_debug("Device type (%s) did not match Type=%s",
+ property, match->match_type);
return 0;
}
}
link_config *link;
LIST_FOREACH(links, link, ctx->links) {
- if (!match_config(link, device)) {
- log_info("Config file %s does not apply to device %s", link->filename, udev_device_get_sysname(device));
- } else {
- log_info("Config file %s applies to device %s", link->filename, udev_device_get_sysname(device));
+ if (match_config(link, device)) {
+ log_debug("Config file %s applies to device %s", link->filename, udev_device_get_sysname(device));
*ret = link;
return 0;
}
return -ENOENT;
}
-int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device) {
- const char *name;
+static bool mac_is_random(struct udev_device *device) {
+ const char *s;
+ unsigned type;
int r;
- name = udev_device_get_sysname(device);
- if (!name)
- return -EINVAL;
+ s = udev_device_get_sysattr_value(device, "addr_assign_type");
+ if (!s)
+ return false; /* if we don't know, assume it is not random */
+ r = safe_atou(s, &type);
+ if (r < 0)
+ return false;
+
+ /* check for NET_ADDR_RANDOM */
+ return type == 1;
+}
+
+static bool mac_is_permanent(struct udev_device *device) {
+ const char *s;
+ unsigned type;
+ int r;
+
+ s = udev_device_get_sysattr_value(device, "addr_assign_type");
+ if (!s)
+ return true; /* if we don't know, assume it is permanent */
+ r = safe_atou(s, &type);
+ if (r < 0)
+ return true;
+
+ /* check for NET_ADDR_PERM */
+ return type == 0;
+}
+
+static int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) {
+ unsigned int seed;
+ int r, i;
+
+ 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 -ENOENT;
+ }
+ }
+ /* fetch some persistent data unique to this machine */
+ r = sd_id128_get_machine(&machine);
+ if (r < 0)
+ return r;
+
+ /* combine the data */
+ seed_str = strappenda(name, sd_id128_to_string(machine, machineid_buf));
+
+ /* hash to get seed */
+ seed = string_hash_func(seed_str);
+ }
- log_info("Configuring %s", name);
+ 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) */
+
+ return 0;
+}
+
+int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device, const char **name) {
+ const char *old_name;
+ const char *new_name = NULL;
+ struct ether_addr generated_mac;
+ struct ether_addr *mac = NULL;
+ int r, ifindex;
+
+ assert(ctx);
+ assert(config);
+ assert(device);
+ assert(name);
+
+ r = link_config_ctx_connect(ctx);
+ if (r < 0)
+ return r;
+
+ old_name = udev_device_get_sysname(device);
+ if (!old_name)
+ return -EINVAL;
if (config->description) {
r = udev_device_set_sysattr_value(device, "ifalias",
config->description);
if (r < 0)
log_warning("Could not set description of %s to '%s': %s",
- name, config->description, strerror(-r));
- else
- log_info("Set link description of %s to '%s'", name,
- config->description);
+ old_name, config->description, strerror(-r));
}
- if (config->speed || config->duplex) {
- r = ethtool_set_speed(ctx->ethtool_fd, name,
- config->speed, config->duplex);
- if (r < 0)
- log_warning("Could not set speed or duplex of %s to %u Mbytes (%s): %s",
- name, config->speed, config->duplex, strerror(-r));
- else
- log_info("Set speed or duplex of %s to %u Mbytes (%s)", name,
- config->speed, config->duplex);
+ r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed, config->duplex);
+ if (r < 0)
+ log_warning("Could not set speed or duplex of %s to %u Mbytes (%s): %s",
+ old_name, config->speed, duplex_to_string(config->duplex), strerror(-r));
+
+ r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol);
+ if (r < 0)
+ log_warning("Could not set WakeOnLan of %s to %s: %s",
+ old_name, wol_to_string(config->wol), strerror(-r));
+
+ ifindex = udev_device_get_ifindex(device);
+ if (ifindex <= 0) {
+ log_warning("Could not find ifindex");
+ return -ENODEV;
}
- if (config->wol) {
- r = ethtool_set_wol(ctx->ethtool_fd, name, config->wol);
- if (r < 0)
- log_warning("Could not set WakeOnLan of %s to %s: %s",
- name, config->wol, strerror(-r));
- else
- log_info("Set WakeOnLan of %s to %s", name, config->wol);
+ if (ctx->enable_name_policy && config->name_policy) {
+ NamePolicy *policy;
+
+ for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; policy++) {
+ switch (*policy) {
+ case NAMEPOLICY_ONBOARD:
+ new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
+ break;
+ case NAMEPOLICY_SLOT:
+ new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
+ break;
+ case NAMEPOLICY_PATH:
+ new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
+ break;
+ case NAMEPOLICY_MAC:
+ new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC");
+ break;
+ default:
+ break;
+ }
+ }
+ }
+
+ if (new_name)
+ *name = new_name; /* a name was set by a policy */
+ else if (config->name)
+ *name = config->name; /* a name was set manually in the config */
+ else
+ *name = NULL;
+
+ switch (config->mac_policy) {
+ case MACPOLICY_PERSISTENT:
+ if (!mac_is_permanent(device)) {
+ r = get_mac(device, false, &generated_mac);
+ if (r < 0)
+ return r;
+ mac = &generated_mac;
+ }
+ break;
+ case MACPOLICY_RANDOM:
+ if (!mac_is_random(device)) {
+ r = get_mac(device, true, &generated_mac);
+ if (r < 0)
+ return r;
+ mac = &generated_mac;
+ }
+ break;
+ default:
+ mac = config->mac;
+ }
+
+ r = rtnl_set_link_properties(ctx->rtnl, ifindex, mac, config->mtu);
+ if (r < 0) {
+ log_warning("Could not set MACAddress or MTU on %s: %s", old_name, strerror(-r));
+ return r;
}
return 0;
~ianmdlvl / elogind.git / blobdiff