X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fudev%2Fnet%2Flink-config.c;h=dc218eb79cb31ab4c21fb883c2f75d819252d893;hp=f93a4d835d44b2971d60cf018892ddb5c9dacbf6;hb=7eb08da4b388b920c8a894b1500c9cc7dc1f31ef;hpb=977085794d2996320e345433403de75f662b0622 diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c index f93a4d835..dc218eb79 100644 --- a/src/udev/net/link-config.c +++ b/src/udev/net/link-config.c @@ -20,10 +20,11 @@ ***/ #include -#include +#include #include "sd-id128.h" +#include "missing.h" #include "link-config.h" #include "ethtool-util.h" @@ -37,18 +38,31 @@ #include "conf-files.h" #include "fileio.h" #include "hashmap.h" +#include "rtnl-util.h" +#include "network-internal.h" +#include "siphash24.h" struct link_config_ctx { LIST_HEAD(link_config, links); int ethtool_fd; + bool enable_name_policy; + sd_rtnl *rtnl; - char **link_dirs; 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}; + DEFINE_TRIVIAL_CLEANUP_FUNC(link_config_ctx*, link_config_ctx_free); #define _cleanup_link_config_ctx_free_ _cleanup_(link_config_ctx_freep) @@ -66,19 +80,7 @@ int link_config_ctx_new(link_config_ctx **ret) { ctx->ethtool_fd = -1; - ctx->link_dirs = strv_new("/etc/systemd/network", - "/run/systemd/network", - "/usr/lib/systemd/network", - NULL); - if (!ctx->link_dirs) { - log_error("failed to build link config directory array"); - return -ENOMEM; - } - - if (!path_strv_canonicalize_uniq(ctx->link_dirs)) { - log_error("failed to canonicalize link config directories\n"); - return -ENOMEM; - } + ctx->enable_name_policy = true; *ret = ctx; ctx = NULL; @@ -86,23 +88,6 @@ int link_config_ctx_new(link_config_ctx **ret) { return 0; } -static int link_config_ctx_connect(link_config_ctx *ctx) { - int r; - - if (ctx->ethtool_fd >= 0 && ctx->rtnl) - return 0; - - r = ethtool_connect(&ctx->ethtool_fd); - if (r < 0) - return r; - - r = sd_rtnl_open(0, &ctx->rtnl); - if (r < 0) - return r; - - return 0; -} - static void link_configs_free(link_config_ctx *ctx) { link_config *link, *link_next; @@ -111,10 +96,13 @@ static void link_configs_free(link_config_ctx *ctx) { LIST_FOREACH_SAFE(links, link, link_next, ctx->links) { free(link->filename); + free(link->name); free(link->match_path); free(link->match_driver); free(link->match_type); free(link->description); + free(link->alias); + free(link->name_policy); free(link); } @@ -124,12 +112,10 @@ void link_config_ctx_free(link_config_ctx *ctx) { if (!ctx) return; - if (ctx->ethtool_fd >= 0) - close_nointr_nofail(ctx->ethtool_fd); + safe_close(ctx->ethtool_fd); sd_rtnl_unref(ctx->rtnl); - strv_free(ctx->link_dirs); link_configs_free(ctx); free(ctx); @@ -138,62 +124,88 @@ void link_config_ctx_free(link_config_ctx *ctx) { } static int load_link(link_config_ctx *ctx, const char *filename) { - link_config *link; - FILE *file; + _cleanup_free_ 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; + return -errno; } - link = new0(link_config, 1); - if (!link) { - r = log_oom(); - goto failure; + 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, - (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); + 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; -failure: - free(link); - return r; + 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; - char **files, **f; + _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(ctx->link_dirs, &ctx->link_dirs_ts_usec, true); + paths_check_timestamp(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; - } + 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); @@ -205,129 +217,44 @@ int link_config_load(link_config_ctx *ctx) { } 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 || memcmp(match->match_mac, ether_aton(property), ETH_ALEN)) { - log_debug("Device MAC address (%s) did not match MACAddress=%s", - property, ether_ntoa(match->match_mac)); - return 0; - } - } - - if (match->match_path) { - property = udev_device_get_property_value(device, "ID_PATH"); - if (!streq_ptr(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 (!streq_ptr(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 (!streq_ptr(match->match_type, property)) { - log_debug("Device type (%s) did not match Type=%s", - property, match->match_type); - return 0; - } - } - - return 1; + 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) { +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)); + const char* attr_value; + 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); + + 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), + name_assign_type == NET_NAME_RENAMED)) { + log_debug("Config file %s applies to device %s", + link->filename, + udev_device_get_sysname(device)); *ret = link; return 0; } } - return -ENOENT; -} - -static int rtnl_set_properties(sd_rtnl *rtnl, int ifindex, const char *name, const struct ether_addr *mac, unsigned int mtu) { - _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message; - bool need_update = false; - int r; - - assert(rtnl); - assert(ifindex > 0); - - r = sd_rtnl_message_link_new(RTM_NEWLINK, ifindex, 0, 0, &message); - if (r < 0) - return r; - - if (name) { - r = sd_rtnl_message_append(message, IFLA_IFNAME, name); - if (r < 0) - return r; - - need_update = true; - } - - if (mac) { - r = sd_rtnl_message_append(message, IFLA_ADDRESS, mac); - if (r < 0) - return r; - - need_update = true; - } - - if (mtu > 0) { - r = sd_rtnl_message_append(message, IFLA_MTU, &mtu); - if (r < 0) - return r; - - need_update = true; - } - - if (need_update) { - r = sd_rtnl_send_with_reply_and_block(rtnl, message, 0, NULL); - if (r < 0) - return r; - } - - return 0; -} - -static bool enable_name_policy(void) { - _cleanup_free_ char *line; - char *w, *state; - int r; - size_t l; + *ret = NULL; - r = read_one_line_file("/proc/cmdline", &line); - if (r < 0) { - log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); - return true; /* something is very wrong, let's not make it worse */ - } - - FOREACH_WORD_QUOTED(w, l, line, state) - if (strneq(w, "net.ifnames=0", l)) - return false; - - return true; + return -ENOENT; } static bool mac_is_random(struct udev_device *device) { @@ -335,114 +262,102 @@ static bool mac_is_random(struct udev_device *device) { 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; /* if we don't know, assume it is not random */ + return false; + r = safe_atou(s, &type); if (r < 0) return false; - /* check for NET_ADDR_RANDOM */ - return type == 1; + return type == NET_ADDR_RANDOM; } -static bool mac_is_permanent(struct udev_device *device) { +static bool should_rename(struct udev_device *device, bool respect_predictable) { const char *s; unsigned type; int r; - s = udev_device_get_sysattr_value(device, "addr_assign_type"); + /* 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; /* if we don't know, assume it is permanent */ + return true; + r = safe_atou(s, &type); if (r < 0) return true; - /* check for NET_ADDR_PERM */ - return type == 0; + 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) { - unsigned int seed; - int r, i; +static int get_mac(struct udev_device *device, bool want_random, + struct ether_addr *mac) { + int r; if (want_random) - seed = random_u(); + random_bytes(mac->ether_addr_octet, ETH_ALEN); else { - const char *name; - sd_id128_t machine; - char machineid_buf[33]; - const char *seed_str; - - /* fetch some persistent data unique (on this machine) to this device */ - name = udev_device_get_property_value(device, "ID_NET_NAME_ONBOARD"); - if (!name) { - name = udev_device_get_property_value(device, "ID_NET_NAME_SLOT"); - if (!name) { - name = udev_device_get_property_value(device, "ID_NET_NAME_PATH"); - if (!name) - return -ENOENT; - } - } - /* fetch some persistent data unique to this machine */ - r = sd_id128_get_machine(&machine); + uint8_t result[8]; + + r = net_get_unique_predictable_data(device, result); if (r < 0) return r; - /* combine the data */ - seed_str = strappenda(name, sd_id128_to_string(machine, machineid_buf)); - - /* hash to get seed */ - seed = string_hash_func(seed_str); - } - - srandom(seed); - - for(i = 0; i < ETH_ALEN; i++) { - mac->ether_addr_octet[i] = random(); + 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) */ + 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; +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; - r = link_config_ctx_connect(ctx); - if (r < 0) - return r; + assert(ctx); + assert(config); + assert(device); + assert(name); - name = udev_device_get_sysname(device); - if (!name) + old_name = udev_device_get_sysname(device); + if (!old_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)); - } - - r = ethtool_set_speed(ctx->ethtool_fd, name, config->speed, config->duplex); + r = ethtool_set_speed(&ctx->ethtool_fd, old_name, config->speed / 1024, + config->duplex); if (r < 0) - log_warning("Could not set speed or duplex of %s to %u Mbytes (%s): %s", - name, config->speed, duplex_to_string(config->duplex), strerror(-r)); + 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, name, config->wol); + r = ethtool_set_wol(&ctx->ethtool_fd, old_name, config->wol); if (r < 0) - log_warning("Could not set WakeOnLan of %s to %s: %s", - name, wol_to_string(config->wol), strerror(-r)); + 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) { @@ -450,11 +365,18 @@ int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_dev return -ENODEV; } - if (config->name_policy && enable_name_policy()) { + if (ctx->enable_name_policy && config->name_policy) { NamePolicy *policy; - for (policy = config->name_policy; !new_name && *policy != _NAMEPOLICY_INVALID; 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; @@ -473,15 +395,20 @@ int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_dev } } - if (!new_name && config->name) { - new_name = config->name; - } + 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_permanent(device)) { + if (mac_is_random(device)) { r = get_mac(device, false, &generated_mac); - if (r < 0) + if (r == -ENOENT) + break; + else if (r < 0) return r; mac = &generated_mac; } @@ -489,7 +416,9 @@ int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_dev case MACPOLICY_RANDOM: if (!mac_is_random(device)) { r = get_mac(device, true, &generated_mac); - if (r < 0) + if (r == -ENOENT) + break; + else if (r < 0) return r; mac = &generated_mac; } @@ -498,11 +427,52 @@ int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_dev mac = config->mac; } - r = rtnl_set_properties(ctx->rtnl, ifindex, new_name, mac, config->mtu); - if (r < 0) { - log_warning("Could not set Name, MACAddress or MTU on %s: %s", name, strerror(-r)); + 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; + 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");