475 lines
15 KiB
C
475 lines
15 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <netinet/ether.h>
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#include "sd-id128.h"
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#include "missing.h"
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#include "link-config.h"
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#include "ethtool-util.h"
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#include "libudev-private.h"
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#include "sd-rtnl.h"
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#include "util.h"
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#include "log.h"
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#include "strv.h"
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#include "path-util.h"
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#include "conf-parser.h"
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#include "conf-files.h"
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#include "fileio.h"
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#include "hashmap.h"
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#include "rtnl-util.h"
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#include "network-internal.h"
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#include "siphash24.h"
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struct link_config_ctx {
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LIST_HEAD(link_config, links);
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int ethtool_fd;
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bool enable_name_policy;
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sd_rtnl *rtnl;
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usec_t link_dirs_ts_usec;
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};
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static const char* const link_dirs[] = {
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"/etc/systemd/network",
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"/run/systemd/network",
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"/usr/lib/systemd/network",
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#ifdef HAVE_SPLIT_USR
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"/lib/systemd/network",
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#endif
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NULL};
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DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free);
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#define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep)
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int link_config_ctx_new(link_config_ctx **ret) {
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_cleanup_link_config_ctx_free_ link_config_ctx *ctx = NULL;
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if (!ret)
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return -EINVAL;
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ctx = new0(link_config_ctx, 1);
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if (!ctx)
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return -ENOMEM;
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LIST_HEAD_INIT(ctx->links);
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ctx->ethtool_fd = -1;
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ctx->enable_name_policy = true;
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*ret = ctx;
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ctx = NULL;
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return 0;
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}
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static void link_configs_free(link_config_ctx *ctx) {
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link_config *link, *link_next;
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if (!ctx)
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return;
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LIST_FOREACH_SAFE(links, link, link_next, ctx->links) {
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free(link->filename);
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free(link->match_path);
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free(link->match_driver);
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free(link->match_type);
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free(link->description);
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free(link->alias);
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free(link->name_policy);
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free(link);
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}
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}
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void link_config_ctx_free(link_config_ctx *ctx) {
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if (!ctx)
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return;
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safe_close(ctx->ethtool_fd);
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sd_rtnl_unref(ctx->rtnl);
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link_configs_free(ctx);
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free(ctx);
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return;
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}
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static int load_link(link_config_ctx *ctx, const char *filename) {
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_cleanup_free_ link_config *link = NULL;
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_cleanup_fclose_ FILE *file = NULL;
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int r;
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assert(ctx);
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assert(filename);
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file = fopen(filename, "re");
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if (!file) {
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if (errno == ENOENT)
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return 0;
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else
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return -errno;
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}
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if (null_or_empty_fd(fileno(file))) {
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log_debug("Skipping empty file: %s", filename);
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return 0;
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}
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link = new0(link_config, 1);
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if (!link)
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return log_oom();
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link->mac_policy = _MACPOLICY_INVALID;
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link->wol = _WOL_INVALID;
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link->duplex = _DUP_INVALID;
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r = config_parse(NULL, filename, file,
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"Match\0Link\0Ethernet\0",
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config_item_perf_lookup, link_config_gperf_lookup,
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false, false, true, link);
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if (r < 0)
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return r;
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else
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log_debug("Parsed configuration file %s", filename);
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link->filename = strdup(filename);
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LIST_PREPEND(links, ctx->links, link);
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link = NULL;
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return 0;
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}
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static bool enable_name_policy(void) {
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_cleanup_free_ char *line = NULL;
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const char *word, *state;
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int r;
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size_t l;
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r = proc_cmdline(&line);
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if (r < 0)
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log_warning("Failed to read /proc/cmdline, ignoring: %s",
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strerror(-r));
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if (r <= 0)
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return true;
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FOREACH_WORD_QUOTED(word, l, line, state)
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if (strneq(word, "net.ifnames=0", l))
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return false;
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return true;
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}
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int link_config_load(link_config_ctx *ctx) {
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int r;
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_cleanup_strv_free_ char **files;
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char **f;
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link_configs_free(ctx);
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if (!enable_name_policy()) {
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ctx->enable_name_policy = false;
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log_info("Network interface NamePolicy= disabled on kernel command line, ignoring.");
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}
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/* update timestamp */
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paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, true);
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r = conf_files_list_strv(&files, ".link", NULL, link_dirs);
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if (r < 0) {
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log_error("failed to enumerate link files: %s", strerror(-r));
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return r;
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}
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STRV_FOREACH_BACKWARDS(f, files) {
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r = load_link(ctx, *f);
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if (r < 0)
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return r;
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}
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return 0;
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}
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bool link_config_should_reload(link_config_ctx *ctx) {
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return paths_check_timestamp(link_dirs, &ctx->link_dirs_ts_usec, false);
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}
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int link_config_get(link_config_ctx *ctx, struct udev_device *device,
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link_config **ret) {
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link_config *link;
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LIST_FOREACH(links, link, ctx->links) {
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const char* attr_value = udev_device_get_sysattr_value(device, "address");
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if (net_match_config(link->match_mac, link->match_path, link->match_driver,
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link->match_type, NULL, link->match_host,
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link->match_virt, link->match_kernel, link->match_arch,
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attr_value ? ether_aton(attr_value) : NULL,
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udev_device_get_property_value(device, "ID_PATH"),
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udev_device_get_driver(udev_device_get_parent(device)),
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udev_device_get_property_value(device, "ID_NET_DRIVER"),
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udev_device_get_devtype(device),
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NULL)) {
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log_debug("Config file %s applies to device %s",
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link->filename,
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udev_device_get_sysname(device));
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*ret = link;
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return 0;
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}
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}
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*ret = NULL;
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return -ENOENT;
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}
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static bool mac_is_random(struct udev_device *device) {
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const char *s;
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unsigned type;
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int r;
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/* if we can't get the assign type, assume it is not random */
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s = udev_device_get_sysattr_value(device, "addr_assign_type");
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if (!s)
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return false;
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r = safe_atou(s, &type);
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if (r < 0)
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return false;
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return type == NET_ADDR_RANDOM;
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}
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static bool should_rename(struct udev_device *device, bool respect_predictable) {
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const char *s;
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unsigned type;
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int r;
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/* if we can't get the assgin type, assume we should rename */
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s = udev_device_get_sysattr_value(device, "name_assign_type");
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if (!s)
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return true;
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r = safe_atou(s, &type);
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if (r < 0)
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return true;
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switch (type) {
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case NET_NAME_USER:
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case NET_NAME_RENAMED:
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/* these were already named by userspace, do not touch again */
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return false;
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case NET_NAME_PREDICTABLE:
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/* the kernel claims to have given a predictable name */
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if (respect_predictable)
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return false;
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/* fall through */
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case NET_NAME_ENUM:
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default:
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/* the name is known to be bad, or of an unknown type */
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return true;
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}
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}
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static int get_mac(struct udev_device *device, bool want_random,
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struct ether_addr *mac) {
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int r;
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if (want_random)
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random_bytes(mac->ether_addr_octet, ETH_ALEN);
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else {
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uint8_t result[8];
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r = net_get_unique_predictable_data(device, result);
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if (r < 0)
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return r;
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assert_cc(ETH_ALEN <= sizeof(result));
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memcpy(mac->ether_addr_octet, result, ETH_ALEN);
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}
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/* see eth_random_addr in the kernel */
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mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
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mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
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return 0;
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}
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int link_config_apply(link_config_ctx *ctx, link_config *config,
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struct udev_device *device, const char **name) {
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const char *old_name;
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const char *new_name = NULL;
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struct ether_addr generated_mac;
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struct ether_addr *mac = NULL;
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bool respect_predictable = false;
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int r, ifindex;
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assert(ctx);
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assert(config);
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assert(device);
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assert(name);
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old_name = udev_device_get_sysname(device);
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if (!old_name)
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return -EINVAL;
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r = ethtool_set_speed(&ctx->ethtool_fd, old_name, config->speed / 1024,
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config->duplex);
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if (r < 0)
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log_warning("Could not set speed or duplex of %s to %u Mbps (%s): %s",
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old_name, config->speed / 1024,
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duplex_to_string(config->duplex), strerror(-r));
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r = ethtool_set_wol(&ctx->ethtool_fd, old_name, config->wol);
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if (r < 0)
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log_warning("Could not set WakeOnLan of %s to %s: %s",
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old_name, wol_to_string(config->wol), strerror(-r));
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ifindex = udev_device_get_ifindex(device);
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if (ifindex <= 0) {
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log_warning("Could not find ifindex");
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return -ENODEV;
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}
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if (ctx->enable_name_policy && config->name_policy) {
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NamePolicy *policy;
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for (policy = config->name_policy;
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!new_name && *policy != _NAMEPOLICY_INVALID; policy++) {
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switch (*policy) {
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case NAMEPOLICY_KERNEL:
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respect_predictable = true;
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break;
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case NAMEPOLICY_DATABASE:
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new_name = udev_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE");
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break;
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case NAMEPOLICY_ONBOARD:
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new_name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD");
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break;
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case NAMEPOLICY_SLOT:
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new_name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT");
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break;
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case NAMEPOLICY_PATH:
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new_name = udev_device_get_property_value(device, "ID_NET_NAME_PATH");
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break;
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case NAMEPOLICY_MAC:
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new_name = udev_device_get_property_value(device, "ID_NET_NAME_MAC");
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break;
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default:
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break;
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}
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}
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}
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if (should_rename(device, respect_predictable)) {
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/* if not set by policy, fall back manually set name */
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if (!new_name)
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new_name = config->name;
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} else
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new_name = NULL;
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switch (config->mac_policy) {
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case MACPOLICY_PERSISTENT:
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if (mac_is_random(device)) {
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r = get_mac(device, false, &generated_mac);
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if (r == -ENOENT)
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break;
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else if (r < 0)
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return r;
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mac = &generated_mac;
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}
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break;
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case MACPOLICY_RANDOM:
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if (!mac_is_random(device)) {
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r = get_mac(device, true, &generated_mac);
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if (r == -ENOENT)
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break;
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else if (r < 0)
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return r;
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mac = &generated_mac;
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}
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break;
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default:
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mac = config->mac;
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}
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r = rtnl_set_link_properties(&ctx->rtnl, ifindex, config->alias, mac,
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config->mtu);
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if (r < 0) {
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log_warning("Could not set Alias, MACAddress or MTU on %s: %s",
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old_name, strerror(-r));
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return r;
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}
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*name = new_name;
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return 0;
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}
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int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret) {
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const char *name;
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char *driver;
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int r;
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name = udev_device_get_sysname(device);
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if (!name)
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return -EINVAL;
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r = ethtool_get_driver(&ctx->ethtool_fd, name, &driver);
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if (r < 0)
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return r;
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*ret = driver;
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return 0;
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}
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static const char* const mac_policy_table[_MACPOLICY_MAX] = {
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[MACPOLICY_PERSISTENT] = "persistent",
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[MACPOLICY_RANDOM] = "random"
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};
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DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy);
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DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy,
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"Failed to parse MAC address policy");
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static const char* const name_policy_table[_NAMEPOLICY_MAX] = {
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[NAMEPOLICY_KERNEL] = "kernel",
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[NAMEPOLICY_DATABASE] = "database",
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[NAMEPOLICY_ONBOARD] = "onboard",
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[NAMEPOLICY_SLOT] = "slot",
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[NAMEPOLICY_PATH] = "path",
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[NAMEPOLICY_MAC] = "mac"
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};
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DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
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DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy,
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_NAMEPOLICY_INVALID,
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"Failed to parse interface name policy");
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