[thirdparty/systemd.git] / src / udev / net / link-config.c

/* SPDX-License-Identifier: LGPL-2.1+ */

#include <linux/netdevice.h>
#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 "def.h"
#include "device-util.h"
#include "ethtool-util.h"
#include "fd-util.h"
#include "link-config.h"
#include "log.h"
#include "memory-util.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"

struct link_config_ctx {
        LIST_HEAD(link_config, links);

        int ethtool_fd;

        bool enable_name_policy;

        sd_netlink *rtnl;

        usec_t network_dirs_ts_usec;
};

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);
        strv_free(link->match_name);
        strv_free(link->match_property);
        condition_free_list(link->conditions);

        free(link->description);
        free(link->mac);
        free(link->name_policy);
        free(link->name);
        strv_free(link->alternative_names);
        free(link->alternative_names_policy);
        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;
}

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;
}

int link_load_one(link_config_ctx *ctx, const char *filename) {
        _cleanup_(link_config_freep) link_config *link = NULL;
        _cleanup_fclose_ FILE *file = NULL;
        _cleanup_free_ char *name = NULL;
        size_t i;
        int r;

        assert(ctx);
        assert(filename);

        file = fopen(filename, "re");
        if (!file)
                return errno == ENOENT ? 0 : -errno;

        if (null_or_empty_fd(fileno(file))) {
                log_debug("Skipping empty file: %s", filename);
                return 0;
        }

        name = strdup(filename);
        if (!name)
                return -ENOMEM;

        link = new(link_config, 1);
        if (!link)
                return -ENOMEM;

        *link = (link_config) {
                .filename = TAKE_PTR(name),
                .mac_address_policy = _MAC_ADDRESS_POLICY_INVALID,
                .wol = _WOL_INVALID,
                .duplex = _DUP_INVALID,
                .port = _NET_DEV_PORT_INVALID,
                .autonegotiation = -1,
        };

        for (i = 0; i < ELEMENTSOF(link->features); i++)
                link->features[i] = -1;

        r = config_parse(NULL, filename, file,
                         "Match\0Link\0",
                         config_item_perf_lookup, link_config_gperf_lookup,
                         CONFIG_PARSE_WARN, link);
        if (r < 0)
                return r;

        if (link->speed > UINT_MAX)
                return -ERANGE;

        if (set_isempty(link->match_mac) && strv_isempty(link->match_path) &&
            strv_isempty(link->match_driver) && strv_isempty(link->match_type) &&
            strv_isempty(link->match_name) && strv_isempty(link->match_property) && !link->conditions)
                log_warning("%s: No valid settings found in the [Match] section. "
                            "The file will match all interfaces. "
                            "If that is intended, please add OriginalName=* in the [Match] section.",
                            filename);

        if (!condition_test_list(link->conditions, NULL, NULL, NULL)) {
                log_debug("%s: Conditions do not match the system environment, skipping.", filename);
                return 0;
        }

        log_debug("Parsed configuration file %s", filename);

        LIST_PREPEND(links, ctx->links, TAKE_PTR(link));
        return 0;
}

static bool enable_name_policy(void) {
        bool b;

        return proc_cmdline_get_bool("net.ifnames", &b) <= 0 || b;
}

static int link_unsigned_attribute(sd_device *device, const char *attr, unsigned *type) {
        const char *s;
        int r;

        r = sd_device_get_sysattr_value(device, attr, &s);
        if (r < 0)
                return log_device_debug_errno(device, r, "Failed to query %s: %m", attr);

        r = safe_atou(s, type);
        if (r < 0)
                return log_device_warning_errno(device, r, "Failed to parse %s \"%s\": %m", attr, s);

        log_device_debug(device, "Device has %s=%u", attr, *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(NETWORK_DIRS, &ctx->network_dirs_ts_usec, true);

        r = conf_files_list_strv(&files, ".link", NULL, 0, NETWORK_DIRS);
        if (r < 0)
                return log_error_errno(r, "failed to enumerate link files: %m");

        STRV_FOREACH_BACKWARDS(f, files) {
                r = link_load_one(ctx, *f);
                if (r < 0)
                        log_error_errno(r, "Failed to load %s, ignoring: %m", *f);
        }

        return 0;
}

bool link_config_should_reload(link_config_ctx *ctx) {
        return paths_check_timestamp(NETWORK_DIRS, &ctx->network_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) {
                if (net_match_config(link->match_mac, link->match_path, link->match_driver,
                                     link->match_type, link->match_name, link->match_property, NULL, NULL, NULL,
                                     device, NULL, NULL, NULL, 0, NULL, NULL)) {
                        if (link->match_name && !strv_contains(link->match_name, "*")) {
                                unsigned name_assign_type = NET_NAME_UNKNOWN;

                                (void) link_unsigned_attribute(device, "name_assign_type", &name_assign_type);

                                if (name_assign_type == NET_NAME_ENUM) {
                                        log_device_warning(device, "Config file %s applies to device based on potentially unpredictable interface name",
                                                           link->filename);
                                        *ret = link;

                                        return 0;
                                } else if (name_assign_type == NET_NAME_RENAMED) {
                                        log_device_warning(device, "Config file %s matches device based on renamed interface name, ignoring",
                                                           link->filename);

                                        continue;
                                }
                        }

                        log_device_debug(device, "Config file %s is applied", link->filename);

                        *ret = link;
                        return 0;
                }
        }

        *ret = NULL;
        return -ENOENT;
}

static int get_mac(sd_device *device, MACAddressPolicy policy, struct ether_addr *mac) {
        unsigned addr_type;
        bool want_random = policy == MAC_ADDRESS_POLICY_RANDOM;
        int r;

        assert(IN_SET(policy, MAC_ADDRESS_POLICY_RANDOM, MAC_ADDRESS_POLICY_PERSISTENT));

        r = link_unsigned_attribute(device, "addr_assign_type", &addr_type);
        if (r < 0)
                return r;
        switch (addr_type) {
        case NET_ADDR_SET:
                return log_device_debug(device, "MAC on the device already set by userspace");
        case NET_ADDR_STOLEN:
                return log_device_debug(device, "MAC on the device already set based on another device");
        case NET_ADDR_RANDOM:
        case NET_ADDR_PERM:
                break;
        default:
                return log_device_warning(device, "Unknown addr_assign_type %u, ignoring", addr_type);
        }

        if (want_random == (addr_type == NET_ADDR_RANDOM))
                return log_device_debug(device, "MAC on the device already matches policy *%s*",
                                        mac_address_policy_to_string(policy));

        if (want_random) {
                log_device_debug(device, "Using random bytes to generate MAC");
                random_bytes(mac->ether_addr_octet, ETH_ALEN);
        } else {
                uint64_t result;

                r = net_get_unique_predictable_data(device,
                                                    naming_scheme_has(NAMING_STABLE_VIRTUAL_MACS),
                                                    &result);
                if (r < 0)
                        return log_device_warning_errno(device, r, "Could not generate persistent MAC: %m");

                log_device_debug(device, "Using generated persistent MAC address");
                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 1;
}

int link_config_apply(link_config_ctx *ctx, link_config *config,
                      sd_device *device, const char **name) {
        _cleanup_strv_free_ char **altnames = NULL;
        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->autonegotiation, config->advertise,
                                      config->speed, config->duplex, config->port);
        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);
        }

        if (config->ring.rx_pending_set || config->ring.tx_pending_set) {
                r = ethtool_set_nic_buffer_size(&ctx->ethtool_fd, old_name, &config->ring);
                if (r < 0)
                        log_warning_errno(r, "Could not set ring buffer 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_unsigned_attribute(device, "name_assign_type", &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; *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 (ifname_valid(new_name))
                                break;
                }

        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:

        if (IN_SET(config->mac_address_policy, MAC_ADDRESS_POLICY_PERSISTENT, MAC_ADDRESS_POLICY_RANDOM)) {
                if (get_mac(device, config->mac_address_policy, &generated_mac) > 0)
                        mac = &generated_mac;
        } else
                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);

        if (config->alternative_names) {
                altnames = strv_copy(config->alternative_names);
                if (!altnames)
                        return log_oom();
        }

        if (config->alternative_names_policy)
                for (NamePolicy *p = config->alternative_names_policy; *p != _NAMEPOLICY_INVALID; p++) {
                        const char *n;

                        switch (*p) {
                        case NAMEPOLICY_DATABASE:
                                (void) sd_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE", &n);
                                break;
                        case NAMEPOLICY_ONBOARD:
                                (void) sd_device_get_property_value(device, "ID_NET_NAME_ONBOARD", &n);
                                break;
                        case NAMEPOLICY_SLOT:
                                (void) sd_device_get_property_value(device, "ID_NET_NAME_SLOT", &n);
                                break;
                        case NAMEPOLICY_PATH:
                                (void) sd_device_get_property_value(device, "ID_NET_NAME_PATH", &n);
                                break;
                        case NAMEPOLICY_MAC:
                                (void) sd_device_get_property_value(device, "ID_NET_NAME_MAC", &n);
                                break;
                        default:
                                assert_not_reached("invalid policy");
                        }
                        if (!isempty(n)) {
                                r = strv_extend(&altnames, n);
                                if (r < 0)
                                        return log_oom();
                        }
                }

        if (new_name)
                strv_remove(altnames, new_name);
        strv_remove(altnames, old_name);
        strv_uniq(altnames);
        strv_sort(altnames);

        r = rtnl_set_link_alternative_names(&ctx->rtnl, ifindex, altnames);
        if (r == -EOPNOTSUPP)
                log_debug_errno(r, "Could not set AlternativeName= or apply AlternativeNamesPolicy= on %s, ignoring: %m", old_name);
        else if (r < 0)
                return log_warning_errno(r, "Could not set AlternativeName= or apply AlternativeNamesPolicy= 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_address_policy_table[_MAC_ADDRESS_POLICY_MAX] = {
        [MAC_ADDRESS_POLICY_PERSISTENT] = "persistent",
        [MAC_ADDRESS_POLICY_RANDOM] = "random",
        [MAC_ADDRESS_POLICY_NONE] = "none",
};

DEFINE_STRING_TABLE_LOOKUP(mac_address_policy, MACAddressPolicy);
DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_address_policy, mac_address_policy, MACAddressPolicy,
                         "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");

static const char* const alternative_names_policy_table[_NAMEPOLICY_MAX] = {
        [NAMEPOLICY_DATABASE] = "database",
        [NAMEPOLICY_ONBOARD] = "onboard",
        [NAMEPOLICY_SLOT] = "slot",
        [NAMEPOLICY_PATH] = "path",
        [NAMEPOLICY_MAC] = "mac",
};

DEFINE_STRING_TABLE_LOOKUP(alternative_names_policy, NamePolicy);
DEFINE_CONFIG_PARSE_ENUMV(config_parse_alternative_names_policy, alternative_names_policy, NamePolicy,
                          _NAMEPOLICY_INVALID,
                          "Failed to parse alternative names policy");
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
af6f0d42	2
01234e1f	3	#include <linux/netdevice.h>
43b3a5ef TG	4	#include <netinet/ether.h>
43b3a5ef TG	5
e5eadf53	6	#include "sd-device.h"
07630cea	7	#include "sd-netlink.h"
af6f0d42	8
b5efdb8a	9	#include "alloc-util.h"
07630cea LP	10	#include "conf-files.h"
07630cea LP	11	#include "conf-parser.h"
dc0d4078	12	#include "def.h"
b220632c	13	#include "device-util.h"
a5010333	14	#include "ethtool-util.h"
3ffd4af2	15	#include "fd-util.h"
07630cea	16	#include "link-config.h"
af6f0d42	17	#include "log.h"
0a970718	18	#include "memory-util.h"
73d2bb08	19	#include "naming-scheme.h"
1c4baffc	20	#include "netlink-util.h"
c6f7c917	21	#include "network-internal.h"
6bedfcbb	22	#include "parse-util.h"
07630cea	23	#include "path-util.h"
4e731273	24	#include "proc-cmdline.h"
3df3e884	25	#include "random-util.h"
8fcde012	26	#include "stat-util.h"
8b43440b	27	#include "string-table.h"
07630cea LP	28	#include "string-util.h"
07630cea LP	29	#include "strv.h"
af6f0d42 TG	30
	31	struct link_config_ctx {
	32	LIST_HEAD(link_config, links);
	33
a5010333 TG	34	int ethtool_fd;
a5010333 TG	35
f6194225 TG	36	bool enable_name_policy;
f6194225 TG	37
1c4baffc	38	sd_netlink *rtnl;
43b3a5ef	39
dc0d4078	40	usec_t network_dirs_ts_usec;
af6f0d42 TG	41	};
af6f0d42 TG	42
9a4b012e TG	43	static void link_config_free(link_config *link) {
	44	if (!link)
	45	return;
5b9d4dc0	46
9a4b012e TG	47	free(link->filename);
9a4b012e TG	48
e90d0374	49	set_free_free(link->match_mac);
43d60b77 TG	50	strv_free(link->match_path);
	51	strv_free(link->match_driver);
	52	strv_free(link->match_type);
391f6bc1	53	strv_free(link->match_name);
44005bfb	54	strv_free(link->match_property);
c4f58dea	55	condition_free_list(link->conditions);
9a4b012e TG	56
	57	free(link->description);
	58	free(link->mac);
	59	free(link->name_policy);
	60	free(link->name);
a5053a15	61	strv_free(link->alternative_names);
ef1d2c07	62	free(link->alternative_names_policy);
9a4b012e TG	63	free(link->alias);
	64
	65	free(link);
af6f0d42 TG	66	}
af6f0d42 TG	67
9a4b012e TG	68	DEFINE_TRIVIAL_CLEANUP_FUNC(link_config*, link_config_free);
9a4b012e TG	69
af6f0d42 TG	70	static void link_configs_free(link_config_ctx *ctx) {
	71	link_config link, link_next;
	72
	73	if (!ctx)
	74	return;
	75
9a4b012e TG	76	LIST_FOREACH_SAFE(links, link, link_next, ctx->links)
9a4b012e TG	77	link_config_free(link);
af6f0d42 TG	78	}
	79
	80	void link_config_ctx_free(link_config_ctx *ctx) {
	81	if (!ctx)
	82	return;
	83
03e334a1	84	safe_close(ctx->ethtool_fd);
43b3a5ef	85
1c4baffc	86	sd_netlink_unref(ctx->rtnl);
43b3a5ef	87
af6f0d42 TG	88	link_configs_free(ctx);
	89
	90	free(ctx);
	91
	92	return;
	93	}
	94
9a4b012e TG	95	int link_config_ctx_new(link_config_ctx **ret) {
	96	_cleanup_(link_config_ctx_freep) link_config_ctx *ctx = NULL;
	97
	98	if (!ret)
	99	return -EINVAL;
	100
	101	ctx = new0(link_config_ctx, 1);
	102	if (!ctx)
	103	return -ENOMEM;
	104
	105	LIST_HEAD_INIT(ctx->links);
	106
	107	ctx->ethtool_fd = -1;
	108
	109	ctx->enable_name_policy = true;
	110
1cc6c93a	111	*ret = TAKE_PTR(ctx);
9a4b012e TG	112
	113	return 0;
	114	}
	115
a378400b	116	int link_load_one(link_config_ctx ctx, const char filename) {
9a4b012e	117	_cleanup_(link_config_freep) link_config *link = NULL;
6e37cd2f	118	_cleanup_fclose_ FILE *file = NULL;
6cdab9f1	119	_cleanup_free_ char *name = NULL;
79a60834	120	size_t i;
af6f0d42 TG	121	int r;
af6f0d42 TG	122
187dc6e5 TA	123	assert(ctx);
	124	assert(filename);
	125
af6f0d42	126	file = fopen(filename, "re");
f2d251cd YW	127	if (!file)
f2d251cd YW	128	return errno == ENOENT ? 0 : -errno;
af6f0d42	129
ed88bcfb ZJS	130	if (null_or_empty_fd(fileno(file))) {
	131	log_debug("Skipping empty file: %s", filename);
	132	return 0;
	133	}
	134
6cdab9f1 YW	135	name = strdup(filename);
	136	if (!name)
	137	return -ENOMEM;
	138
	139	link = new(link_config, 1);
ecb08ec6	140	if (!link)
e8a42907	141	return -ENOMEM;
af6f0d42	142
6cdab9f1 YW	143	*link = (link_config) {
6cdab9f1 YW	144	.filename = TAKE_PTR(name),
54ed9f88	145	.mac_address_policy = _MAC_ADDRESS_POLICY_INVALID,
6cdab9f1 YW	146	.wol = _WOL_INVALID,
	147	.duplex = _DUP_INVALID,
	148	.port = _NET_DEV_PORT_INVALID,
	149	.autonegotiation = -1,
	150	};
5fde13d7	151
79a60834	152	for (i = 0; i < ELEMENTSOF(link->features); i++)
cc2ff878	153	link->features[i] = -1;
50725d10	154
e9f3d2d5	155	r = config_parse(NULL, filename, file,
c6b3370a	156	"Match\0Link\0",
e9f3d2d5	157	config_item_perf_lookup, link_config_gperf_lookup,
bcde742e	158	CONFIG_PARSE_WARN, link);
36f822c4	159	if (r < 0)
ecb08ec6	160	return r;
af6f0d42	161
4e964aa0	162	if (link->speed > UINT_MAX)
dab495dc TG	163	return -ERANGE;
dab495dc TG	164
84ea567e YW	165	if (set_isempty(link->match_mac) && strv_isempty(link->match_path) &&
84ea567e YW	166	strv_isempty(link->match_driver) && strv_isempty(link->match_type) &&
44005bfb	167	strv_isempty(link->match_name) && strv_isempty(link->match_property) && !link->conditions)
84ea567e YW	168	log_warning("%s: No valid settings found in the [Match] section. "
	169	"The file will match all interfaces. "
	170	"If that is intended, please add OriginalName=* in the [Match] section.",
	171	filename);
	172
c4f58dea	173	if (!condition_test_list(link->conditions, NULL, NULL, NULL)) {
176d9c0e YW	174	log_debug("%s: Conditions do not match the system environment, skipping.", filename);
	175	return 0;
	176	}
	177
6cdab9f1	178	log_debug("Parsed configuration file %s", filename);
af6f0d42	179
4b4a6c9b	180	LIST_PREPEND(links, ctx->links, TAKE_PTR(link));
af6f0d42	181	return 0;
af6f0d42 TG	182	}
af6f0d42 TG	183
f6194225	184	static bool enable_name_policy(void) {
1d84ad94	185	bool b;
f6194225	186
1d84ad94	187	return proc_cmdline_get_bool("net.ifnames", &b) <= 0 \|\| b;
f6194225 TG	188	}
f6194225 TG	189
015b097c	190	static int link_unsigned_attribute(sd_device device, const char attr, unsigned *type) {
0b189e8f ZJS	191	const char *s;
	192	int r;
	193
015b097c	194	r = sd_device_get_sysattr_value(device, attr, &s);
0b189e8f	195	if (r < 0)
015b097c	196	return log_device_debug_errno(device, r, "Failed to query %s: %m", attr);
0b189e8f ZJS	197
	198	r = safe_atou(s, type);
	199	if (r < 0)
015b097c	200	return log_device_warning_errno(device, r, "Failed to parse %s \"%s\": %m", attr, s);
0b189e8f	201
015b097c	202	log_device_debug(device, "Device has %s=%u", attr, *type);
0b189e8f ZJS	203	return 0;
	204	}
	205
af6f0d42	206	int link_config_load(link_config_ctx *ctx) {
edf029b7 TG	207	_cleanup_strv_free_ char **files;
edf029b7 TG	208	char **f;
a39f92d3	209	int r;
af6f0d42 TG	210
	211	link_configs_free(ctx);
	212
f6194225 TG	213	if (!enable_name_policy()) {
f6194225 TG	214	ctx->enable_name_policy = false;
3f85ef0f	215	log_info("Network interface NamePolicy= disabled on kernel command line, ignoring.");
f6194225 TG	216	}
f6194225 TG	217
97f2d76d	218	/* update timestamp */
dc0d4078	219	paths_check_timestamp(NETWORK_DIRS, &ctx->network_dirs_ts_usec, true);
af6f0d42	220
dc0d4078	221	r = conf_files_list_strv(&files, ".link", NULL, 0, NETWORK_DIRS);
f647962d MS	222	if (r < 0)
f647962d MS	223	return log_error_errno(r, "failed to enumerate link files: %m");
af6f0d42 TG	224
af6f0d42 TG	225	STRV_FOREACH_BACKWARDS(f, files) {
a378400b	226	r = link_load_one(ctx, *f);
af6f0d42	227	if (r < 0)
e8a42907	228	log_error_errno(r, "Failed to load %s, ignoring: %m", *f);
af6f0d42 TG	229	}
	230
	231	return 0;
	232	}
	233
	234	bool link_config_should_reload(link_config_ctx *ctx) {
dc0d4078	235	return paths_check_timestamp(NETWORK_DIRS, &ctx->network_dirs_ts_usec, false);
af6f0d42 TG	236	}
af6f0d42 TG	237
e5eadf53	238	int link_config_get(link_config_ctx ctx, sd_device device, link_config **ret) {
af6f0d42 TG	239	link_config *link;
af6f0d42 TG	240
3b64e4d4 TG	241	assert(ctx);
	242	assert(device);
	243	assert(ret);
	244
af6f0d42	245	LIST_FOREACH(links, link, ctx->links) {
edbb03e9	246	if (net_match_config(link->match_mac, link->match_path, link->match_driver,
78404d22	247	link->match_type, link->match_name, link->match_property, NULL, NULL, NULL,
572b21d9	248	device, NULL, NULL, NULL, 0, NULL, NULL)) {
56637e5c	249	if (link->match_name && !strv_contains(link->match_name, "*")) {
015b097c	250	unsigned name_assign_type = NET_NAME_UNKNOWN;
32bc8adc	251
015b097c	252	(void) link_unsigned_attribute(device, "name_assign_type", &name_assign_type);
32bc8adc	253
56637e5c	254	if (name_assign_type == NET_NAME_ENUM) {
b38de0e9 YW	255	log_device_warning(device, "Config file %s applies to device based on potentially unpredictable interface name",
b38de0e9 YW	256	link->filename);
32bc8adc TG	257	*ret = link;
	258
	259	return 0;
	260	} else if (name_assign_type == NET_NAME_RENAMED) {
b38de0e9 YW	261	log_device_warning(device, "Config file %s matches device based on renamed interface name, ignoring",
b38de0e9 YW	262	link->filename);
32bc8adc	263
ca6038b8	264	continue;
32bc8adc	265	}
ca6038b8	266	}
32bc8adc	267
b38de0e9	268	log_device_debug(device, "Config file %s is applied", link->filename);
32bc8adc	269
ca6038b8	270	*ret = link;
ca6038b8	271	return 0;
af6f0d42 TG	272	}
	273	}
	274
be32eb9b	275	*ret = NULL;
af6f0d42 TG	276	return -ENOENT;
	277	}
	278
54ed9f88	279	static int get_mac(sd_device device, MACAddressPolicy policy, struct ether_addr mac) {
015b097c	280	unsigned addr_type;
54ed9f88	281	bool want_random = policy == MAC_ADDRESS_POLICY_RANDOM;
f1ac7002	282	int r;
16b9b87a	283
54ed9f88	284	assert(IN_SET(policy, MAC_ADDRESS_POLICY_RANDOM, MAC_ADDRESS_POLICY_PERSISTENT));
3c9b8860	285
015b097c	286	r = link_unsigned_attribute(device, "addr_assign_type", &addr_type);
f1ac7002	287	if (r < 0)
015b097c ZJS	288	return r;
	289	switch (addr_type) {
	290	case NET_ADDR_SET:
	291	return log_device_debug(device, "MAC on the device already set by userspace");
	292	case NET_ADDR_STOLEN:
	293	return log_device_debug(device, "MAC on the device already set based on another device");
	294	case NET_ADDR_RANDOM:
	295	case NET_ADDR_PERM:
	296	break;
	297	default:
	298	return log_device_warning(device, "Unknown addr_assign_type %u, ignoring", addr_type);
	299	}
04b67d49	300
015b097c ZJS	301	if (want_random == (addr_type == NET_ADDR_RANDOM))
015b097c ZJS	302	return log_device_debug(device, "MAC on the device already matches policy %s",
54ed9f88	303	mac_address_policy_to_string(policy));
16b9b87a	304
015b097c ZJS	305	if (want_random) {
015b097c ZJS	306	log_device_debug(device, "Using random bytes to generate MAC");
9bf3b535	307	random_bytes(mac->ether_addr_octet, ETH_ALEN);
015b097c	308	} else {
dbe81cbd	309	uint64_t result;
9bf3b535	310
96848152 ZJS	311	r = net_get_unique_predictable_data(device,
	312	naming_scheme_has(NAMING_STABLE_VIRTUAL_MACS),
	313	&result);
16b9b87a	314	if (r < 0)
015b097c	315	return log_device_warning_errno(device, r, "Could not generate persistent MAC: %m");
16b9b87a	316
96848152	317	log_device_debug(device, "Using generated persistent MAC address");
9bf3b535	318	assert_cc(ETH_ALEN <= sizeof(result));
dbe81cbd	319	memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
16b9b87a TG	320	}
	321
	322	/* see eth_random_addr in the kernel */
3c9b8860 TG	323	mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
3c9b8860 TG	324	mac->ether_addr_octet[0] \|= 0x02; /* set local assignment bit (IEEE802) */
015b097c	325	return 1;
16b9b87a TG	326	}
16b9b87a TG	327
464cf22f	328	int link_config_apply(link_config_ctx ctx, link_config config,
e5eadf53	329	sd_device device, const char *name) {
ef1d2c07	330	_cleanup_strv_free_ char **altnames = NULL;
5fde13d7	331	struct ether_addr generated_mac;
16b9b87a	332	struct ether_addr *mac = NULL;
a39f92d3 SS	333	const char *new_name = NULL;
a39f92d3 SS	334	const char *old_name;
0b189e8f ZJS	335	unsigned speed, name_type = NET_NAME_UNKNOWN;
0b189e8f ZJS	336	NamePolicy policy;
43b3a5ef	337	int r, ifindex;
af6f0d42	338
3e137a1b TG	339	assert(ctx);
	340	assert(config);
	341	assert(device);
	342	assert(name);
	343
e5eadf53 YW	344	r = sd_device_get_sysname(device, &old_name);
	345	if (r < 0)
	346	return r;
af6f0d42	347
5c2316c6 YW	348	r = ethtool_set_glinksettings(&ctx->ethtool_fd, old_name,
	349	config->autonegotiation, config->advertise,
	350	config->speed, config->duplex, config->port);
a39f92d3 SS	351	if (r < 0) {
a39f92d3 SS	352
bb79318e	353	if (config->port != _NET_DEV_PORT_INVALID)
49c603bd	354	log_warning_errno(r, "Could not set port (%s) of %s: %m", port_to_string(config->port), old_name);
bb79318e	355
5dd10118	356	if (!eqzero(config->advertise))
2d18ac44	357	log_warning_errno(r, "Could not set advertise mode: %m"); /* TODO: include modes in the log message. */
a39f92d3	358
6cf0a204	359	if (config->speed) {
6cf0a204 SS	360	speed = DIV_ROUND_UP(config->speed, 1000000);
	361	if (r == -EOPNOTSUPP) {
	362	r = ethtool_set_speed(&ctx->ethtool_fd, old_name, speed, config->duplex);
	363	if (r < 0)
	364	log_warning_errno(r, "Could not set speed of %s to %u Mbps: %m", old_name, speed);
	365	}
	366	}
	367
6eee8857 YW	368	if (config->duplex != _DUP_INVALID)
6eee8857 YW	369	log_warning_errno(r, "Could not set duplex of %s to %s: %m", old_name, duplex_to_string(config->duplex));
a39f92d3	370	}
a5010333	371
aedca892	372	r = ethtool_set_wol(&ctx->ethtool_fd, old_name, config->wol);
5fde13d7	373	if (r < 0)
755bde37 LP	374	log_warning_errno(r, "Could not set WakeOnLan of %s to %s: %m",
755bde37 LP	375	old_name, wol_to_string(config->wol));
af6f0d42	376
50725d10 SS	377	r = ethtool_set_features(&ctx->ethtool_fd, old_name, config->features);
	378	if (r < 0)
	379	log_warning_errno(r, "Could not set offload features of %s: %m", old_name);
	380
5f945202 SS	381	if (config->channels.rx_count_set \|\| config->channels.tx_count_set \|\| config->channels.other_count_set \|\| config->channels.combined_count_set) {
	382	r = ethtool_set_channels(&ctx->ethtool_fd, old_name, &config->channels);
	383	if (r < 0)
	384	log_warning_errno(r, "Could not set channels of %s: %m", old_name);
	385	}
	386
224ded67 SS	387	if (config->ring.rx_pending_set \|\| config->ring.tx_pending_set) {
	388	r = ethtool_set_nic_buffer_size(&ctx->ethtool_fd, old_name, &config->ring);
	389	if (r < 0)
	390	log_warning_errno(r, "Could not set ring buffer of %s: %m", old_name);
	391	}
	392
e5eadf53 YW	393	r = sd_device_get_ifindex(device, &ifindex);
e5eadf53 YW	394	if (r < 0)
b220632c	395	return log_device_warning_errno(device, r, "Could not find ifindex: %m");
43b3a5ef	396
015b097c	397	(void) link_unsigned_attribute(device, "name_assign_type", &name_type);
0b189e8f	398
73d2bb08 ZJS	399	if (IN_SET(name_type, NET_NAME_USER, NET_NAME_RENAMED)
	400	&& !naming_scheme_has(NAMING_ALLOW_RERENAMES)) {
	401	log_device_debug(device, "Device already has a name given by userspace, not renaming.");
	402	goto no_rename;
	403	}
	404
0b189e8f	405	if (ctx->enable_name_policy && config->name_policy)
78f8849f	406	for (NamePolicy p = config->name_policy; p != _NAMEPOLICY_INVALID; p++) {
0b189e8f ZJS	407	policy = *p;
	408
	409	switch (policy) {
	410	case NAMEPOLICY_KERNEL:
	411	if (name_type != NET_NAME_PREDICTABLE)
	412	continue;
	413
	414	/* The kernel claims to have given a predictable name, keep it. */
	415	log_device_debug(device, "Policy %s: keeping predictable kernel name",
	416	name_policy_to_string(policy));
	417	goto no_rename;
3907446f ZJS	418	case NAMEPOLICY_KEEP:
	419	if (!IN_SET(name_type, NET_NAME_USER, NET_NAME_RENAMED))
	420	continue;
	421
	422	log_device_debug(device, "Policy %s: keeping existing userspace name",
	423	name_policy_to_string(policy));
	424	goto no_rename;
0b189e8f ZJS	425	case NAMEPOLICY_DATABASE:
	426	(void) sd_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE", &new_name);
	427	break;
	428	case NAMEPOLICY_ONBOARD:
	429	(void) sd_device_get_property_value(device, "ID_NET_NAME_ONBOARD", &new_name);
	430	break;
	431	case NAMEPOLICY_SLOT:
	432	(void) sd_device_get_property_value(device, "ID_NET_NAME_SLOT", &new_name);
	433	break;
	434	case NAMEPOLICY_PATH:
	435	(void) sd_device_get_property_value(device, "ID_NET_NAME_PATH", &new_name);
	436	break;
	437	case NAMEPOLICY_MAC:
	438	(void) sd_device_get_property_value(device, "ID_NET_NAME_MAC", &new_name);
	439	break;
	440	default:
	441	assert_not_reached("invalid policy");
5fde13d7	442	}
78f8849f YW	443	if (ifname_valid(new_name))
78f8849f YW	444	break;
daeb71a3	445	}
daeb71a3	446
0b189e8f ZJS	447	if (new_name)
	448	log_device_debug(device, "Policy %s yields \"%s\".", name_policy_to_string(policy), new_name);
	449	else if (config->name) {
	450	new_name = config->name;
	451	log_device_debug(device, "Policies didn't yield a name, using specified Name=%s.", new_name);
ed308023	452	} else
0b189e8f ZJS	453	log_device_debug(device, "Policies didn't yield a name and Name= is not given, not renaming.");
0b189e8f ZJS	454	no_rename:
04b67d49	455
54ed9f88 ZJS	456	if (IN_SET(config->mac_address_policy, MAC_ADDRESS_POLICY_PERSISTENT, MAC_ADDRESS_POLICY_RANDOM)) {
54ed9f88 ZJS	457	if (get_mac(device, config->mac_address_policy, &generated_mac) > 0)
015b097c ZJS	458	mac = &generated_mac;
	459	} else
	460	mac = config->mac;
16b9b87a	461
dab495dc	462	r = rtnl_set_link_properties(&ctx->rtnl, ifindex, config->alias, mac, config->mtu);
f647962d	463	if (r < 0)
7b72fe21	464	return log_warning_errno(r, "Could not set Alias=, MACAddress= or MTU= on %s: %m", old_name);
43b3a5ef	465
ef1d2c07 YW	466	if (config->alternative_names) {
	467	altnames = strv_copy(config->alternative_names);
	468	if (!altnames)
	469	return log_oom();
	470	}
	471
	472	if (config->alternative_names_policy)
	473	for (NamePolicy p = config->alternative_names_policy; p != _NAMEPOLICY_INVALID; p++) {
	474	const char *n;
	475
	476	switch (*p) {
	477	case NAMEPOLICY_DATABASE:
	478	(void) sd_device_get_property_value(device, "ID_NET_NAME_FROM_DATABASE", &n);
	479	break;
	480	case NAMEPOLICY_ONBOARD:
	481	(void) sd_device_get_property_value(device, "ID_NET_NAME_ONBOARD", &n);
	482	break;
	483	case NAMEPOLICY_SLOT:
	484	(void) sd_device_get_property_value(device, "ID_NET_NAME_SLOT", &n);
	485	break;
	486	case NAMEPOLICY_PATH:
	487	(void) sd_device_get_property_value(device, "ID_NET_NAME_PATH", &n);
	488	break;
	489	case NAMEPOLICY_MAC:
	490	(void) sd_device_get_property_value(device, "ID_NET_NAME_MAC", &n);
	491	break;
	492	default:
	493	assert_not_reached("invalid policy");
	494	}
	495	if (!isempty(n)) {
	496	r = strv_extend(&altnames, n);
	497	if (r < 0)
	498	return log_oom();
	499	}
	500	}
	501
	502	if (new_name)
	503	strv_remove(altnames, new_name);
	504	strv_remove(altnames, old_name);
	505	strv_uniq(altnames);
4d016e96	506	strv_sort(altnames);
ef1d2c07 YW	507
ef1d2c07 YW	508	r = rtnl_set_link_alternative_names(&ctx->rtnl, ifindex, altnames);
bb181dd4	509	if (r == -EOPNOTSUPP)
ef1d2c07	510	log_debug_errno(r, "Could not set AlternativeName= or apply AlternativeNamesPolicy= on %s, ignoring: %m", old_name);
bb181dd4	511	else if (r < 0)
ef1d2c07	512	return log_warning_errno(r, "Could not set AlternativeName= or apply AlternativeNamesPolicy= on %s: %m", old_name);
a5053a15	513
d95b83b8 TG	514	*name = new_name;
d95b83b8 TG	515
af6f0d42 TG	516	return 0;
af6f0d42 TG	517	}
be32eb9b	518
e5eadf53	519	int link_get_driver(link_config_ctx ctx, sd_device device, char **ret) {
847a8a5f	520	const char *name;
a7f7d1bd	521	char *driver = NULL;
847a8a5f TG	522	int r;
847a8a5f TG	523
e5eadf53 YW	524	r = sd_device_get_sysname(device, &name);
	525	if (r < 0)
	526	return r;
847a8a5f	527
aedca892	528	r = ethtool_get_driver(&ctx->ethtool_fd, name, &driver);
847a8a5f TG	529	if (r < 0)
	530	return r;
	531
	532	*ret = driver;
	533	return 0;
	534	}
	535
54ed9f88 ZJS	536	static const char* const mac_address_policy_table[_MAC_ADDRESS_POLICY_MAX] = {
	537	[MAC_ADDRESS_POLICY_PERSISTENT] = "persistent",
	538	[MAC_ADDRESS_POLICY_RANDOM] = "random",
	539	[MAC_ADDRESS_POLICY_NONE] = "none",
be32eb9b TG	540	};
be32eb9b TG	541
54ed9f88 ZJS	542	DEFINE_STRING_TABLE_LOOKUP(mac_address_policy, MACAddressPolicy);
54ed9f88 ZJS	543	DEFINE_CONFIG_PARSE_ENUM(config_parse_mac_address_policy, mac_address_policy, MACAddressPolicy,
464cf22f	544	"Failed to parse MAC address policy");
be32eb9b	545
2c5859af	546	static const char* const name_policy_table[_NAMEPOLICY_MAX] = {
04b67d49	547	[NAMEPOLICY_KERNEL] = "kernel",
3907446f	548	[NAMEPOLICY_KEEP] = "keep",
e51660ae	549	[NAMEPOLICY_DATABASE] = "database",
be32eb9b TG	550	[NAMEPOLICY_ONBOARD] = "onboard",
	551	[NAMEPOLICY_SLOT] = "slot",
	552	[NAMEPOLICY_PATH] = "path",
3907446f	553	[NAMEPOLICY_MAC] = "mac",
be32eb9b TG	554	};
	555
	556	DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy);
464cf22f TG	557	DEFINE_CONFIG_PARSE_ENUMV(config_parse_name_policy, name_policy, NamePolicy,
	558	_NAMEPOLICY_INVALID,
	559	"Failed to parse interface name policy");
ef1d2c07 YW	560
	561	static const char* const alternative_names_policy_table[_NAMEPOLICY_MAX] = {
	562	[NAMEPOLICY_DATABASE] = "database",
	563	[NAMEPOLICY_ONBOARD] = "onboard",
	564	[NAMEPOLICY_SLOT] = "slot",
	565	[NAMEPOLICY_PATH] = "path",
	566	[NAMEPOLICY_MAC] = "mac",
	567	};
	568
	569	DEFINE_STRING_TABLE_LOOKUP(alternative_names_policy, NamePolicy);
	570	DEFINE_CONFIG_PARSE_ENUMV(config_parse_alternative_names_policy, alternative_names_policy, NamePolicy,
	571	_NAMEPOLICY_INVALID,
	572	"Failed to parse alternative names policy");