/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright (C) 2013 Tom Gundersen 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 . ***/ #include #include #include "missing.h" #include "link-config.h" #include "ethtool-util.h" #include "libudev-private.h" #include "sd-rtnl.h" #include "util.h" #include "log.h" #include "strv.h" #include "path-util.h" #include "conf-parser.h" #include "conf-files.h" #include "rtnl-util.h" #include "network-internal.h" #include "random-util.h" struct link_config_ctx { LIST_HEAD(link_config, links); int ethtool_fd; bool enable_name_policy; sd_rtnl *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_rtnl_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); 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; 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 { uint8_t result[8]; 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 %u 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; 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" }; 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");