Adding upstream version 241.upstream/241upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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");