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Systemd/src/udev/net/link-config.c

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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <netinet/ether.h>
#include "sd-device.h"
#include "sd-netlink.h"
#include "alloc-util.h"
#include "conf-files.h"
#include "conf-parser.h"
#include "device-util.h"
#include "ethtool-util.h"
#include "fd-util.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",
#if HAVE_SPLIT_USR
"/lib/systemd/network",
#endif
NULL};
static void link_config_free(link_config *link) {
if (!link)
return;
free(link->filename);
set_free_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_cmdline);
free(link->match_kernel_version);
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 = TAKE_PTR(ctx);
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 i;
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;
link->port = _NET_DEV_PORT_INVALID;
link->autonegotiation = -1;
for (i = 0; i < (int)ELEMENTSOF(link->features); i++)
link->features[i] = -1;
r = config_parse(NULL, filename, file,
"Match\0Link\0Ethernet\0",
config_item_perf_lookup, link_config_gperf_lookup,
CONFIG_PARSE_WARN, link);
if (r < 0)
return r;
else
log_debug("Parsed configuration file %s", filename);
if (link->speed > UINT_MAX)
return -ERANGE;
link->filename = strdup(filename);
if (!link->filename)
return log_oom();
LIST_PREPEND(links, ctx->links, link);
link = NULL;
return 0;
}
static bool enable_name_policy(void) {
bool b;
return proc_cmdline_get_bool("net.ifnames", &b) <= 0 || b;
}
int link_config_load(link_config_ctx *ctx) {
_cleanup_strv_free_ char **files;
char **f;
int r;
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, 0, 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, sd_device *device, link_config **ret) {
link_config *link;
assert(ctx);
assert(device);
assert(ret);
LIST_FOREACH(links, link, ctx->links) {
const char *address = NULL, *id_path = NULL, *parent_driver = NULL, *id_net_driver = NULL, *devtype = NULL, *sysname = NULL;
sd_device *parent;
(void) sd_device_get_sysattr_value(device, "address", &address);
(void) sd_device_get_property_value(device, "ID_PATH", &id_path);
if (sd_device_get_parent(device, &parent) >= 0)
(void) sd_device_get_driver(parent, &parent_driver);
(void) sd_device_get_property_value(device, "ID_NET_DRIVER", &id_net_driver);
(void) sd_device_get_devtype(device, &devtype);
(void) sd_device_get_sysname(device, &sysname);
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_cmdline,
link->match_kernel_version, link->match_arch,
address ? ether_aton(address) : NULL,
id_path,
parent_driver,
id_net_driver,
devtype,
sysname)) {
if (link->match_name) {
unsigned char name_assign_type = NET_NAME_UNKNOWN;
const char *attr_value;
if (sd_device_get_sysattr_value(device, "name_assign_type", &attr_value) >= 0)
(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, sysname);
*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, sysname);
continue;
}
}
log_debug("Config file %s applies to device %s",
link->filename, sysname);
*ret = link;
return 0;
}
}
*ret = NULL;
return -ENOENT;
}
static bool mac_is_random(sd_device *device) {
const char *s;
unsigned type;
int r;
/* if we can't get the assign type, assume it is not random */
if (sd_device_get_sysattr_value(device, "addr_assign_type", &s) < 0)
return false;
r = safe_atou(s, &type);
if (r < 0)
return false;
return type == NET_ADDR_RANDOM;
}
static bool should_rename(sd_device *device, bool respect_predictable) {
const char *s;
unsigned type;
int r;
/* if we can't get the assgin type, assume we should rename */
if (sd_device_get_sysattr_value(device, "name_assign_type", &s) < 0)
return true;
r = safe_atou(s, &type);
if (r < 0)
return true;
switch (type) {
case NET_NAME_PREDICTABLE:
/* the kernel claims to have given a predictable name */
if (respect_predictable)
return false;
_fallthrough_;
default:
/* the name is known to be bad, or of an unknown type */
return true;
}
}
static int get_mac(sd_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,
sd_device *device, const char **name) {
bool respect_predictable = false;
struct ether_addr generated_mac;
struct ether_addr *mac = NULL;
const char *new_name = NULL;
const char *old_name;
unsigned speed;
int r, ifindex;
assert(ctx);
assert(config);
assert(device);
assert(name);
r = sd_device_get_sysname(device, &old_name);
if (r < 0)
return r;
r = ethtool_set_glinksettings(&ctx->ethtool_fd, old_name, config);
if (r < 0) {
if (config->port != _NET_DEV_PORT_INVALID)
log_warning_errno(r, "Could not set port (%s) of %s: %m", port_to_string(config->port), old_name);
if (config->advertise)
log_warning_errno(r, "Could not set advertise mode to 0x%X: %m", config->advertise);
if (config->speed) {
speed = DIV_ROUND_UP(config->speed, 1000000);
if (r == -EOPNOTSUPP) {
r = ethtool_set_speed(&ctx->ethtool_fd, old_name, speed, config->duplex);
if (r < 0)
log_warning_errno(r, "Could not set speed of %s to %u Mbps: %m", old_name, speed);
}
}
if (config->duplex !=_DUP_INVALID)
log_warning_errno(r, "Could not set duplex of %s to (%s): %m", old_name, 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));
r = ethtool_set_features(&ctx->ethtool_fd, old_name, config->features);
if (r < 0)
log_warning_errno(r, "Could not set offload features of %s: %m", old_name);
if (config->channels.rx_count_set || config->channels.tx_count_set || config->channels.other_count_set || config->channels.combined_count_set) {
r = ethtool_set_channels(&ctx->ethtool_fd, old_name, &config->channels);
if (r < 0)
log_warning_errno(r, "Could not set channels of %s: %m", old_name);
}
r = sd_device_get_ifindex(device, &ifindex);
if (r < 0)
return log_device_warning_errno(device, r, "Could not find ifindex: %m");
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:
(void) sd_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE", &new_name);
break;
case NAMEPOLICY_ONBOARD:
(void) sd_device_get_property_value(device, "ID_NET_NAME_ONBOARD", &new_name);
break;
case NAMEPOLICY_SLOT:
(void) sd_device_get_property_value(device, "ID_NET_NAME_SLOT", &new_name);
break;
case NAMEPOLICY_PATH:
(void) sd_device_get_property_value(device, "ID_NET_NAME_PATH", &new_name);
break;
case NAMEPOLICY_MAC:
(void) sd_device_get_property_value(device, "ID_NET_NAME_MAC", &new_name);
break;
default:
break;
}
}
}
if (!new_name && should_rename(device, respect_predictable))
new_name = config->name;
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, sd_device *device, char **ret) {
const char *name;
char *driver = NULL;
int r;
r = sd_device_get_sysname(device, &name);
if (r < 0)
return r;
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");
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