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Diffstat (limited to 'src/grp-udev/libudev-core/net/link-config.c')
-rw-r--r--src/grp-udev/libudev-core/net/link-config.c519
1 files changed, 519 insertions, 0 deletions
diff --git a/src/grp-udev/libudev-core/net/link-config.c b/src/grp-udev/libudev-core/net/link-config.c
new file mode 100644
index 0000000000..350cd24e9c
--- /dev/null
+++ b/src/grp-udev/libudev-core/net/link-config.c
@@ -0,0 +1,519 @@
+/***
+ This file is part of systemd.
+
+ Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <netinet/ether.h>
+
+#include <systemd/sd-netlink.h>
+
+#include "alloc-util.h"
+#include "conf-files.h"
+#include "conf-parser.h"
+#include "ethtool-util.h"
+#include "fd-util.h"
+#include "libudev-private.h"
+#include "link-config.h"
+#include "log.h"
+#include "missing.h"
+#include "netlink-util.h"
+#include "network-internal.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "proc-cmdline.h"
+#include "random-util.h"
+#include "stat-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "util.h"
+
+struct link_config_ctx {
+ LIST_HEAD(link_config, links);
+
+ int ethtool_fd;
+
+ bool enable_name_policy;
+
+ sd_netlink *rtnl;
+
+ usec_t link_dirs_ts_usec;
+};
+
+static const char* const link_dirs[] = {
+ "/etc/systemd/network",
+ "/run/systemd/network",
+ "/usr/lib/systemd/network",
+#ifdef HAVE_SPLIT_USR
+ "/lib/systemd/network",
+#endif
+ NULL};
+
+static void link_config_free(link_config *link) {
+ if (!link)
+ return;
+
+ free(link->filename);
+
+ free(link->match_mac);
+ strv_free(link->match_path);
+ strv_free(link->match_driver);
+ strv_free(link->match_type);
+ free(link->match_name);
+ free(link->match_host);
+ free(link->match_virt);
+ free(link->match_kernel);
+ free(link->match_arch);
+
+ free(link->description);
+ free(link->mac);
+ free(link->name_policy);
+ free(link->name);
+ free(link->alias);
+
+ free(link);
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(link_config*, link_config_free);
+
+static void link_configs_free(link_config_ctx *ctx) {
+ link_config *link, *link_next;
+
+ if (!ctx)
+ return;
+
+ LIST_FOREACH_SAFE(links, link, link_next, ctx->links)
+ link_config_free(link);
+}
+
+void link_config_ctx_free(link_config_ctx *ctx) {
+ if (!ctx)
+ return;
+
+ safe_close(ctx->ethtool_fd);
+
+ sd_netlink_unref(ctx->rtnl);
+
+ link_configs_free(ctx);
+
+ free(ctx);
+
+ return;
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free);
+
+int link_config_ctx_new(link_config_ctx **ret) {
+ _cleanup_(link_config_ctx_freep) link_config_ctx *ctx = NULL;
+
+ if (!ret)
+ return -EINVAL;
+
+ ctx = new0(link_config_ctx, 1);
+ if (!ctx)
+ return -ENOMEM;
+
+ LIST_HEAD_INIT(ctx->links);
+
+ ctx->ethtool_fd = -1;
+
+ ctx->enable_name_policy = true;
+
+ *ret = ctx;
+ ctx = NULL;
+
+ return 0;
+}
+
+static int load_link(link_config_ctx *ctx, const char *filename) {
+ _cleanup_(link_config_freep) link_config *link = NULL;
+ _cleanup_fclose_ FILE *file = NULL;
+ int r;
+
+ assert(ctx);
+ assert(filename);
+
+ file = fopen(filename, "re");
+ if (!file) {
+ if (errno == ENOENT)
+ return 0;
+ else
+ return -errno;
+ }
+
+ if (null_or_empty_fd(fileno(file))) {
+ log_debug("Skipping empty file: %s", filename);
+ return 0;
+ }
+
+ link = new0(link_config, 1);
+ if (!link)
+ return log_oom();
+
+ 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, link_config_gperf_lookup,
+ false, false, true, link);
+ if (r < 0)
+ return r;
+ else
+ log_debug("Parsed configuration file %s", filename);
+
+ if (link->mtu > UINT_MAX || link->speed > UINT_MAX)
+ return -ERANGE;
+
+ link->filename = strdup(filename);
+
+ LIST_PREPEND(links, ctx->links, link);
+ link = NULL;
+
+ return 0;
+}
+
+static bool enable_name_policy(void) {
+ _cleanup_free_ char *line = NULL;
+ const char *word, *state;
+ int r;
+ size_t l;
+
+ r = proc_cmdline(&line);
+ if (r < 0) {
+ log_warning_errno(r, "Failed to read /proc/cmdline, ignoring: %m");
+ return true;
+ }
+
+ FOREACH_WORD_QUOTED(word, l, line, state)
+ if (strneq(word, "net.ifnames=0", l))
+ return false;
+
+ return true;
+}
+
+int link_config_load(link_config_ctx *ctx) {
+ int r;
+ _cleanup_strv_free_ char **files;
+ char **f;
+
+ link_configs_free(ctx);
+
+ if (!enable_name_policy()) {
+ ctx->enable_name_policy = false;
+ log_info("Network interface NamePolicy= disabled on kernel command line, ignoring.");
+ }
+
+ /* update timestamp */
+ paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true);
+
+ r = conf_files_list_strv(&files, ".link", NULL, link_dirs);
+ if (r < 0)
+ return log_error_errno(r, "failed to enumerate link files: %m");
+
+ STRV_FOREACH_BACKWARDS(f, files) {
+ r = load_link(ctx, *f);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+bool link_config_should_reload(link_config_ctx *ctx) {
+ return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false);
+}
+
+int link_config_get(link_config_ctx *ctx, struct udev_device *device,
+ link_config **ret) {
+ link_config *link;
+
+ assert(ctx);
+ assert(device);
+ assert(ret);
+
+ LIST_FOREACH(links, link, ctx->links) {
+ const char* attr_value;
+
+ attr_value = udev_device_get_sysattr_value(device, "address");
+
+ if (net_match_config(link->match_mac, link->match_path, link->match_driver,
+ link->match_type, link->match_name, link->match_host,
+ link->match_virt, link->match_kernel, link->match_arch,
+ attr_value ? ether_aton(attr_value) : NULL,
+ udev_device_get_property_value(device, "ID_PATH"),
+ udev_device_get_driver(udev_device_get_parent(device)),
+ udev_device_get_property_value(device, "ID_NET_DRIVER"),
+ udev_device_get_devtype(device),
+ udev_device_get_sysname(device))) {
+ if (link->match_name) {
+ unsigned char name_assign_type = NET_NAME_UNKNOWN;
+
+ attr_value = udev_device_get_sysattr_value(device, "name_assign_type");
+ if (attr_value)
+ (void) safe_atou8(attr_value, &name_assign_type);
+
+ if (name_assign_type == NET_NAME_ENUM) {
+ log_warning("Config file %s applies to device based on potentially unpredictable interface name '%s'",
+ link->filename, udev_device_get_sysname(device));
+ *ret = link;
+
+ return 0;
+ } else if (name_assign_type == NET_NAME_RENAMED) {
+ log_warning("Config file %s matches device based on renamed interface name '%s', ignoring",
+ link->filename, udev_device_get_sysname(device));
+
+ continue;
+ }
+ }
+
+ log_debug("Config file %s applies to device %s",
+ link->filename, udev_device_get_sysname(device));
+
+ *ret = link;
+
+ return 0;
+ }
+ }
+
+ *ret = NULL;
+
+ return -ENOENT;
+}
+
+static bool mac_is_random(struct udev_device *device) {
+ const char *s;
+ unsigned type;
+ int r;
+
+ /* if we can't get the assign type, assume it is not random */
+ s = udev_device_get_sysattr_value(device, "addr_assign_type");
+ if (!s)
+ return false;
+
+ r = safe_atou(s, &type);
+ if (r < 0)
+ return false;
+
+ return type == NET_ADDR_RANDOM;
+}
+
+static bool should_rename(struct udev_device *device, bool respect_predictable) {
+ const char *s;
+ unsigned type;
+ int r;
+
+ /* if we can't get the assgin type, assume we should rename */
+ s = udev_device_get_sysattr_value(device, "name_assign_type");
+ if (!s)
+ return true;
+
+ r = safe_atou(s, &type);
+ if (r < 0)
+ return true;
+
+ switch (type) {
+ case NET_NAME_USER:
+ case NET_NAME_RENAMED:
+ /* these were already named by userspace, do not touch again */
+ return false;
+ case NET_NAME_PREDICTABLE:
+ /* the kernel claims to have given a predictable name */
+ if (respect_predictable)
+ return false;
+ /* fall through */
+ case NET_NAME_ENUM:
+ default:
+ /* the name is known to be bad, or of an unknown type */
+ return true;
+ }
+}
+
+static int get_mac(struct udev_device *device, bool want_random,
+ struct ether_addr *mac) {
+ int r;
+
+ if (want_random)
+ random_bytes(mac->ether_addr_octet, ETH_ALEN);
+ else {
+ uint64_t result;
+
+ r = net_get_unique_predictable_data(device, &result);
+ if (r < 0)
+ return r;
+
+ assert_cc(ETH_ALEN <= sizeof(result));
+ memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
+ }
+
+ /* 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;
+ bool respect_predictable = false;
+ int r, ifindex;
+
+ assert(ctx);
+ assert(config);
+ assert(device);
+ assert(name);
+
+ old_name = udev_device_get_sysname(device);
+ if (!old_name)
+ return -EINVAL;
+
+ r = ethtool_set_speed(&ctx->ethtool_fd, old_name, config->speed / 1024, config->duplex);
+ if (r < 0)
+ log_warning_errno(r, "Could not set speed or duplex of %s to %zu Mbps (%s): %m",
+ old_name, config->speed / 1024,
+ duplex_to_string(config->duplex));
+
+ r = ethtool_set_wol(&ctx->ethtool_fd, old_name, config->wol);
+ if (r < 0)
+ log_warning_errno(r, "Could not set WakeOnLan of %s to %s: %m",
+ old_name, wol_to_string(config->wol));
+
+ ifindex = udev_device_get_ifindex(device);
+ if (ifindex <= 0) {
+ log_warning("Could not find ifindex");
+ return -ENODEV;
+ }
+
+ 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_KERNEL:
+ respect_predictable = true;
+ break;
+ case NAMEPOLICY_DATABASE:
+ new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE");
+ break;
+ 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 (should_rename(device, respect_predictable)) {
+ /* if not set by policy, fall back manually set name */
+ if (!new_name)
+ new_name = config->name;
+ } else
+ new_name = NULL;
+
+ switch (config->mac_policy) {
+ case MACPOLICY_PERSISTENT:
+ if (mac_is_random(device)) {
+ r = get_mac(device, false, &generated_mac);
+ if (r == -ENOENT) {
+ log_warning_errno(r, "Could not generate persistent MAC address for %s: %m", old_name);
+ break;
+ } else 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 == -ENOENT) {
+ log_warning_errno(r, "Could not generate random MAC address for %s: %m", old_name);
+ break;
+ } else if (r < 0)
+ return r;
+ mac = &generated_mac;
+ }
+ break;
+ case MACPOLICY_NONE:
+ default:
+ mac = config->mac;
+ }
+
+ r = rtnl_set_link_properties(&ctx->rtnl, ifindex, config->alias, mac, config->mtu);
+ if (r < 0)
+ return log_warning_errno(r, "Could not set Alias, MACAddress or MTU on %s: %m", old_name);
+
+ *name = new_name;
+
+ return 0;
+}
+
+int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret) {
+ const char *name;
+ char *driver = NULL;
+ int r;
+
+ name = udev_device_get_sysname(device);
+ if (!name)
+ return -EINVAL;
+
+ r = ethtool_get_driver(&ctx->ethtool_fd, name, &driver);
+ if (r < 0)
+ return r;
+
+ *ret = driver;
+ return 0;
+}
+
+static const char* const mac_policy_table[_MACPOLICY_MAX] = {
+ [MACPOLICY_PERSISTENT] = "persistent",
+ [MACPOLICY_RANDOM] = "random",
+ [MACPOLICY_NONE] = "none"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy);
+DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy,
+ "Failed to parse MAC address policy");
+
+static const char* const name_policy_table[_NAMEPOLICY_MAX] = {
+ [NAMEPOLICY_KERNEL] = "kernel",
+ [NAMEPOLICY_DATABASE] = "database",
+ [NAMEPOLICY_ONBOARD] = "onboard",
+ [NAMEPOLICY_SLOT] = "slot",
+ [NAMEPOLICY_PATH] = "path",
+ [NAMEPOLICY_MAC] = "mac"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
+DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy,
+ _NAMEPOLICY_INVALID,
+ "Failed to parse interface name policy");