link-config.c revision a501033335ed402c8f7e86fe41a15531ba69abd7
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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 "link-config.h"
#include "ethtool-util.h"
#include "util.h"
#include "log.h"
#include "strv.h"
#include "path-util.h"
#include "conf-parser.h"
#include "conf-files.h"
struct link_config_ctx {
LIST_HEAD(link_config, links);
int ethtool_fd;
char **link_dirs;
usec_t *link_dirs_ts_usec;
};
int link_config_ctx_new(link_config_ctx **ret) {
link_config_ctx *ctx;
int r;
if (!ret)
return -EINVAL;
ctx = new0(link_config_ctx, 1);
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",
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;
return 0;
}
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) {
free(link->filename);
free(link->match_path);
free(link->match_driver);
free(link->match_type);
free(link->description);
free(link);
}
}
void link_config_ctx_free(link_config_ctx *ctx) {
if (!ctx)
return;
close_nointr_nofail(ctx->ethtool_fd);
strv_free(ctx->link_dirs);
free(ctx->link_dirs_ts_usec);
link_configs_free(ctx);
free(ctx);
return;
}
static int load_link(link_config_ctx *ctx, const char *filename) {
link_config *link;
FILE *file;
int r;
file = fopen(filename, "re");
if (!file) {
if (errno == ENOENT)
return 0;
else
return errno;
}
link = new0(link_config, 1);
if (!link) {
r = log_oom();
goto failure;
}
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) {
log_warning("Colud not parse config file %s: %s", filename, strerror(-r));
goto failure;
} else
log_info("Parsed configuration file %s", filename);
link->filename = strdup(filename);
LIST_PREPEND(links, ctx->links, link);
return 0;
failure:
free(link);
return r;
}
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);
r = conf_files_list_strv(&files, ".link", NULL, (const char **)ctx->link_dirs);
if (r < 0) {
log_error("failed to enumerate link files: %s", strerror(-r));
return r;
}
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(ctx->link_dirs, ctx->link_dirs_ts_usec, false);
}
static bool match_config(link_config *match, struct udev_device *device) {
const char *property;
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);
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);
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);
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);
return 0;
}
}
return 1;
}
int link_config_get(link_config_ctx *ctx, struct udev_device *device, link_config **ret) {
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));
*ret = link;
return 0;
}
}
return -ENOENT;
}
int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_device *device) {
const char *name;
int r;
name = udev_device_get_sysname(device);
if (!name)
return -EINVAL;
log_info("Configuring %s", name);
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);
}
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);
}
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);
}
return 0;
}