diff options
Diffstat (limited to 'src/udev/net/link-config.c')
| -rw-r--r-- | src/udev/net/link-config.c | 535 |
1 files changed, 535 insertions, 0 deletions
diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c new file mode 100644 index 0000000..eb2477c --- /dev/null +++ b/src/udev/net/link-config.c @@ -0,0 +1,535 @@ +/* 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 "device-util.h" +#include "ethtool-util.h" +#include "fd-util.h" +#include "link-config.h" +#include "log.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" +#include "util.h" + +struct link_config_ctx { + LIST_HEAD(link_config, links); + + int ethtool_fd; + + bool enable_name_policy; + + sd_netlink *rtnl; + + usec_t link_dirs_ts_usec; +}; + +static const char* const link_dirs[] = { + "/etc/systemd/network", + "/run/systemd/network", + "/usr/lib/systemd/network", +#if HAVE_SPLIT_USR + "/lib/systemd/network", +#endif + NULL}; + +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); + free(link->match_name); + free(link->match_host); + free(link->match_virt); + free(link->match_kernel_cmdline); + free(link->match_kernel_version); + 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_netlink_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 = TAKE_PTR(ctx); + + 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 i; + 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; + link->port = _NET_DEV_PORT_INVALID; + link->autonegotiation = -1; + + for (i = 0; i < (int)ELEMENTSOF(link->features); i++) + link->features[i] = -1; + + r = config_parse(NULL, filename, file, + "Match\0Link\0Ethernet\0", + config_item_perf_lookup, link_config_gperf_lookup, + CONFIG_PARSE_WARN, link); + if (r < 0) + return r; + else + log_debug("Parsed configuration file %s", filename); + + if (link->speed > UINT_MAX) + return -ERANGE; + + link->filename = strdup(filename); + if (!link->filename) + return log_oom(); + + LIST_PREPEND(links, ctx->links, link); + link = NULL; + + return 0; +} + +static bool enable_name_policy(void) { + bool b; + + return proc_cmdline_get_bool("net.ifnames", &b) <= 0 || b; +} + +static int link_name_type(sd_device *device, unsigned *type) { + const char *s; + int r; + + r = sd_device_get_sysattr_value(device, "name_assign_type", &s); + if (r < 0) + return log_device_debug_errno(device, r, "Failed to query name_assign_type: %m"); + + r = safe_atou(s, type); + if (r < 0) + return log_device_warning_errno(device, r, "Failed to parse name_assign_type \"%s\": %m", s); + + log_device_debug(device, "Device has name_assign_type=%d", *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(link_dirs, &ctx->link_dirs_ts_usec, true); + + r = conf_files_list_strv(&files, ".link", NULL, 0, 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, 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, *parent_driver = NULL, *id_net_driver = NULL, *devtype = NULL, *sysname = NULL; + sd_device *parent; + + (void) sd_device_get_sysattr_value(device, "address", &address); + (void) sd_device_get_property_value(device, "ID_PATH", &id_path); + if (sd_device_get_parent(device, &parent) >= 0) + (void) sd_device_get_driver(parent, &parent_driver); + (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, link->match_host, + link->match_virt, link->match_kernel_cmdline, + link->match_kernel_version, link->match_arch, + address ? ether_aton(address) : NULL, + id_path, + parent_driver, + id_net_driver, + devtype, + sysname)) { + if (link->match_name) { + unsigned char name_assign_type = NET_NAME_UNKNOWN; + const char *attr_value; + + if (sd_device_get_sysattr_value(device, "name_assign_type", &attr_value) >= 0) + (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, 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 bool mac_is_random(sd_device *device) { + const char *s; + unsigned type; + int r; + + /* if we can't get the assign type, assume it is not random */ + if (sd_device_get_sysattr_value(device, "addr_assign_type", &s) < 0) + return false; + + r = safe_atou(s, &type); + if (r < 0) + return false; + + return type == NET_ADDR_RANDOM; +} + +static int get_mac(sd_device *device, bool want_random, + struct ether_addr *mac) { + int r; + + if (want_random) + random_bytes(mac->ether_addr_octet, ETH_ALEN); + else { + uint64_t result; + + 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, + 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_name_type(device, &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: + + 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; + case MACPOLICY_NONE: + 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, 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_policy_table[_MACPOLICY_MAX] = { + [MACPOLICY_PERSISTENT] = "persistent", + [MACPOLICY_RANDOM] = "random", + [MACPOLICY_NONE] = "none", +}; + +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_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"); |