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=64ff00dc0df40bc291515dc051712ae2e182cf8f;hp=512885f9c8604ced0757f4dd476133e7b3ab9dc8;hb=d95b83b87d7d7c50e550f7128827f73a321c8934;hpb=ed88bcfb7c15029f9fc95ee2380759a9eb782d46 diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c index 512885f9c..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" @@ -193,18 +194,19 @@ static int load_link(link_config_ctx *ctx, const char *filename) { static bool enable_name_policy(void) { _cleanup_free_ char *line = NULL; - char *w, *state; + 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; @@ -244,15 +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"), @@ -276,18 +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 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) { +static int get_mac(struct udev_device *device, bool want_random, + struct ether_addr *mac) { int r; if (want_random) @@ -304,17 +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); @@ -330,11 +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) @@ -350,8 +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; @@ -373,12 +417,12 @@ 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: @@ -405,12 +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; } @@ -441,9 +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", @@ -452,4 +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");