X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fudev%2Fnet%2Flink-config.c;h=64ff00dc0df40bc291515dc051712ae2e182cf8f;hp=8234598e4518e5ae8a0e857e8cd075ba6b928d67;hb=d95b83b87d7d7c50e550f7128827f73a321c8934;hpb=6e37cd2f4af8928d905203108a4331e375d7127c diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c index 8234598e4..64ff00dc0 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" @@ -92,14 +93,20 @@ static int link_config_ctx_connect(link_config_ctx *ctx) { if (ctx->ethtool_fd == -1) { r = ethtool_connect(&ctx->ethtool_fd); - if (r < 0) + if (r < 0) { + log_warning("link_config: could not connect to ethtool: %s", + strerror(-r)); return r; + } } if (!ctx->rtnl) { r = sd_rtnl_open(&ctx->rtnl, 0); - if (r < 0) + if (r < 0) { + log_warning("link_config: could not connect to rtnl: %s", + strerror(-r)); return r; + } } return 0; @@ -118,6 +125,7 @@ static void link_configs_free(link_config_ctx *ctx) { free(link->match_type); free(link->description); free(link->alias); + free(link->name_policy); free(link); } @@ -146,11 +154,6 @@ static int load_link(link_config_ctx *ctx, const char *filename) { assert(ctx); assert(filename); - if (null_or_empty_path(filename)) { - log_debug("skipping empty file: %s", filename); - return 0; - } - file = fopen(filename, "re"); if (!file) { if (errno == ENOENT) @@ -159,6 +162,11 @@ static int load_link(link_config_ctx *ctx, const char *filename) { 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(); @@ -167,12 +175,13 @@ static int load_link(link_config_ctx *ctx, const char *filename) { 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("Could not parse config file %s: %s", filename, strerror(-r)); + 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 + else log_debug("Parsed configuration file %s", filename); link->filename = strdup(filename); @@ -184,19 +193,20 @@ static int load_link(link_config_ctx *ctx, const char *filename) { } static bool enable_name_policy(void) { - _cleanup_free_ char *line; - char *w, *state; + _cleanup_free_ char *line = NULL; + const char *word, *state; int r; size_t l; r = proc_cmdline(&line); if (r < 0) - log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); + log_warning("Failed to read /proc/cmdline, ignoring: %s", + strerror(-r)); if (r <= 0) return true; - FOREACH_WORD_QUOTED(w, l, line, state) - if (strneq(w, "net.ifnames=0", l)) + FOREACH_WORD_QUOTED(word, l, line, state) + if (strneq(word, "net.ifnames=0", l)) return false; return true; @@ -204,7 +214,8 @@ static bool enable_name_policy(void) { int link_config_load(link_config_ctx *ctx) { int r; - char **files, **f; + _cleanup_strv_free_ char **files; + char **f; link_configs_free(ctx); @@ -235,15 +246,17 @@ 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) { +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 = udev_device_get_sysattr_value(device, "address"); if (net_match_config(link->match_mac, link->match_path, link->match_driver, link->match_type, NULL, link->match_host, link->match_virt, link->match_kernel, link->match_arch, - ether_aton(udev_device_get_sysattr_value(device, "address")), + 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"), @@ -267,18 +280,51 @@ 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 int get_mac(struct udev_device *device, bool want_random, struct ether_addr *mac) { +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) @@ -295,17 +341,19 @@ static int get_mac(struct udev_device *device, bool want_random, struct ether_ad } /* 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; assert(ctx); @@ -321,11 +369,12 @@ int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_dev if (!old_name) return -EINVAL; - r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed / 1024, 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 Mbps (%s): %s", - old_name, config->speed / 1024, duplex_to_string(config->duplex), - strerror(-r)); + old_name, config->speed / 1024, + duplex_to_string(config->duplex), strerror(-r)); r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol); if (r < 0) @@ -341,8 +390,12 @@ int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_dev 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; @@ -364,18 +417,20 @@ int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_dev } } - if (new_name) - *name = new_name; /* a name was set by a policy */ - else if (config->name) - *name = config->name; /* a name was set manually in the config */ - else - *name = NULL; + 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 < 0) + if (r == -ENOENT) + break; + else if (r < 0) return r; mac = &generated_mac; } @@ -383,7 +438,9 @@ 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; } @@ -392,12 +449,16 @@ int link_config_apply(link_config_ctx *ctx, link_config *config, struct udev_dev mac = config->mac; } - r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac, config->mtu); + r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac, + config->mtu); if (r < 0) { - log_warning("Could not set Alias, MACAddress or MTU on %s: %s", old_name, strerror(-r)); + log_warning("Could not set Alias, MACAddress or MTU on %s: %s", + old_name, strerror(-r)); return r; } + *name = new_name; + return 0; } @@ -428,9 +489,11 @@ static const char* const mac_policy_table[_MACPOLICY_MAX] = { }; DEFINE_STRING_TABLE_LOOKUP(mac_policy, MACPolicy); -DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_policy, mac_policy, MACPolicy, "Failed to parse MAC address policy"); +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", @@ -439,4 +502,6 @@ static const char* const name_policy_table[_NAMEPOLICY_MAX] = { }; 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"); +DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy, + _NAMEPOLICY_INVALID, + "Failed to parse interface name policy");