| /* 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 "def.h" |
| #include "device-util.h" |
| #include "ethtool-util.h" |
| #include "fd-util.h" |
| #include "link-config.h" |
| #include "log.h" |
| #include "memory-util.h" |
| #include "missing_network.h" |
| #include "naming-scheme.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" |
| |
| struct link_config_ctx { |
| LIST_HEAD(link_config, links); |
| |
| int ethtool_fd; |
| |
| bool enable_name_policy; |
| |
| sd_netlink *rtnl; |
| |
| usec_t network_dirs_ts_usec; |
| }; |
| |
| 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); |
| strv_free(link->match_name); |
| condition_free_list(link->conditions); |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| int link_load_one(link_config_ctx *ctx, const char *filename) { |
| _cleanup_(link_config_freep) link_config *link = NULL; |
| _cleanup_fclose_ FILE *file = NULL; |
| _cleanup_free_ char *name = NULL; |
| size_t i; |
| int r; |
| |
| assert(ctx); |
| assert(filename); |
| |
| file = fopen(filename, "re"); |
| if (!file) |
| return errno == ENOENT ? 0 : -errno; |
| |
| if (null_or_empty_fd(fileno(file))) { |
| log_debug("Skipping empty file: %s", filename); |
| return 0; |
| } |
| |
| name = strdup(filename); |
| if (!name) |
| return -ENOMEM; |
| |
| link = new(link_config, 1); |
| if (!link) |
| return -ENOMEM; |
| |
| *link = (link_config) { |
| .filename = TAKE_PTR(name), |
| .mac_address_policy = _MAC_ADDRESS_POLICY_INVALID, |
| .wol = _WOL_INVALID, |
| .duplex = _DUP_INVALID, |
| .port = _NET_DEV_PORT_INVALID, |
| .autonegotiation = -1, |
| }; |
| |
| for (i = 0; i < ELEMENTSOF(link->features); i++) |
| link->features[i] = -1; |
| |
| r = config_parse(NULL, filename, file, |
| "Match\0Link\0", |
| config_item_perf_lookup, link_config_gperf_lookup, |
| CONFIG_PARSE_WARN, link); |
| if (r < 0) |
| return r; |
| |
| if (link->speed > UINT_MAX) |
| return -ERANGE; |
| |
| if (set_isempty(link->match_mac) && strv_isempty(link->match_path) && |
| strv_isempty(link->match_driver) && strv_isempty(link->match_type) && |
| strv_isempty(link->match_name) && !link->conditions) |
| log_warning("%s: No valid settings found in the [Match] section. " |
| "The file will match all interfaces. " |
| "If that is intended, please add OriginalName=* in the [Match] section.", |
| filename); |
| |
| if (!condition_test_list(link->conditions, NULL, NULL, NULL)) { |
| log_debug("%s: Conditions do not match the system environment, skipping.", filename); |
| return 0; |
| } |
| |
| log_debug("Parsed configuration file %s", filename); |
| |
| LIST_PREPEND(links, ctx->links, TAKE_PTR(link)); |
| return 0; |
| } |
| |
| static bool enable_name_policy(void) { |
| bool b; |
| |
| return proc_cmdline_get_bool("net.ifnames", &b) <= 0 || b; |
| } |
| |
| static int link_unsigned_attribute(sd_device *device, const char *attr, unsigned *type) { |
| const char *s; |
| int r; |
| |
| r = sd_device_get_sysattr_value(device, attr, &s); |
| if (r < 0) |
| return log_device_debug_errno(device, r, "Failed to query %s: %m", attr); |
| |
| r = safe_atou(s, type); |
| if (r < 0) |
| return log_device_warning_errno(device, r, "Failed to parse %s \"%s\": %m", attr, s); |
| |
| log_device_debug(device, "Device has %s=%u", attr, *type); |
| return 0; |
| } |
| |
| 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(NETWORK_DIRS, &ctx->network_dirs_ts_usec, true); |
| |
| r = conf_files_list_strv(&files, ".link", NULL, 0, NETWORK_DIRS); |
| if (r < 0) |
| return log_error_errno(r, "failed to enumerate link files: %m"); |
| |
| STRV_FOREACH_BACKWARDS(f, files) { |
| r = link_load_one(ctx, *f); |
| if (r < 0) |
| log_error_errno(r, "Failed to load %s, ignoring: %m", *f); |
| } |
| |
| return 0; |
| } |
| |
| bool link_config_should_reload(link_config_ctx *ctx) { |
| return paths_check_timestamp(NETWORK_DIRS, &ctx->network_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, *id_net_driver = NULL, *devtype = NULL, *sysname = NULL; |
| |
| (void) sd_device_get_sysattr_value(device, "address", &address); |
| (void) sd_device_get_property_value(device, "ID_PATH", &id_path); |
| (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, |
| address ? ether_aton(address) : NULL, |
| id_path, |
| id_net_driver, |
| devtype, |
| sysname)) { |
| if (link->match_name) { |
| unsigned name_assign_type = NET_NAME_UNKNOWN; |
| |
| (void) link_unsigned_attribute(device, "name_assign_type", &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 int get_mac(sd_device *device, MACAddressPolicy policy, struct ether_addr *mac) { |
| unsigned addr_type; |
| bool want_random = policy == MAC_ADDRESS_POLICY_RANDOM; |
| int r; |
| |
| assert(IN_SET(policy, MAC_ADDRESS_POLICY_RANDOM, MAC_ADDRESS_POLICY_PERSISTENT)); |
| |
| r = link_unsigned_attribute(device, "addr_assign_type", &addr_type); |
| if (r < 0) |
| return r; |
| switch (addr_type) { |
| case NET_ADDR_SET: |
| return log_device_debug(device, "MAC on the device already set by userspace"); |
| case NET_ADDR_STOLEN: |
| return log_device_debug(device, "MAC on the device already set based on another device"); |
| case NET_ADDR_RANDOM: |
| case NET_ADDR_PERM: |
| break; |
| default: |
| return log_device_warning(device, "Unknown addr_assign_type %u, ignoring", addr_type); |
| } |
| |
| if (want_random == (addr_type == NET_ADDR_RANDOM)) |
| return log_device_debug(device, "MAC on the device already matches policy *%s*", |
| mac_address_policy_to_string(policy)); |
| |
| if (want_random) { |
| log_device_debug(device, "Using random bytes to generate MAC"); |
| random_bytes(mac->ether_addr_octet, ETH_ALEN); |
| } else { |
| uint64_t result; |
| |
| r = net_get_unique_predictable_data(device, &result); |
| if (r < 0) |
| return log_device_warning_errno(device, r, "Could not generate persistent MAC: %m"); |
| |
| 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 1; |
| } |
| |
| int link_config_apply(link_config_ctx *ctx, link_config *config, |
| sd_device *device, const char **name) { |
| struct ether_addr generated_mac; |
| struct ether_addr *mac = NULL; |
| const char *new_name = NULL; |
| const char *old_name; |
| unsigned speed, name_type = NET_NAME_UNKNOWN; |
| NamePolicy policy; |
| 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 (!eqzero(config->advertise)) |
| log_warning_errno(r, "Could not set advertise mode: %m"); /* TODO: include modes in the log message. */ |
| |
| 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"); |
| |
| |
| (void) link_unsigned_attribute(device, "name_assign_type", &name_type); |
| |
| if (IN_SET(name_type, NET_NAME_USER, NET_NAME_RENAMED) |
| && !naming_scheme_has(NAMING_ALLOW_RERENAMES)) { |
| log_device_debug(device, "Device already has a name given by userspace, not renaming."); |
| goto no_rename; |
| } |
| |
| if (ctx->enable_name_policy && config->name_policy) |
| for (NamePolicy *p = config->name_policy; !new_name && *p != _NAMEPOLICY_INVALID; p++) { |
| policy = *p; |
| |
| switch (policy) { |
| case NAMEPOLICY_KERNEL: |
| if (name_type != NET_NAME_PREDICTABLE) |
| continue; |
| |
| /* The kernel claims to have given a predictable name, keep it. */ |
| log_device_debug(device, "Policy *%s*: keeping predictable kernel name", |
| name_policy_to_string(policy)); |
| goto no_rename; |
| case NAMEPOLICY_KEEP: |
| if (!IN_SET(name_type, NET_NAME_USER, NET_NAME_RENAMED)) |
| continue; |
| |
| log_device_debug(device, "Policy *%s*: keeping existing userspace name", |
| name_policy_to_string(policy)); |
| goto no_rename; |
| 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: |
| assert_not_reached("invalid policy"); |
| } |
| } |
| |
| if (new_name) |
| log_device_debug(device, "Policy *%s* yields \"%s\".", name_policy_to_string(policy), new_name); |
| else if (config->name) { |
| new_name = config->name; |
| log_device_debug(device, "Policies didn't yield a name, using specified Name=%s.", new_name); |
| } else |
| log_device_debug(device, "Policies didn't yield a name and Name= is not given, not renaming."); |
| no_rename: |
| |
| if (IN_SET(config->mac_address_policy, MAC_ADDRESS_POLICY_PERSISTENT, MAC_ADDRESS_POLICY_RANDOM)) { |
| if (get_mac(device, config->mac_address_policy, &generated_mac) > 0) |
| mac = &generated_mac; |
| } else |
| 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_address_policy_table[_MAC_ADDRESS_POLICY_MAX] = { |
| [MAC_ADDRESS_POLICY_PERSISTENT] = "persistent", |
| [MAC_ADDRESS_POLICY_RANDOM] = "random", |
| [MAC_ADDRESS_POLICY_NONE] = "none", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(mac_address_policy, MACAddressPolicy); |
| DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_address_policy, mac_address_policy, MACAddressPolicy, |
| "Failed to parse MAC address policy"); |
| |
| static const char* const name_policy_table[_NAMEPOLICY_MAX] = { |
| [NAMEPOLICY_KERNEL] = "kernel", |
| [NAMEPOLICY_KEEP] = "keep", |
| [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"); |