X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fnetwork%2Fnetworkd-manager.c;h=2e3b4bb885e010249ca56c582a28e6b1c5415ca5;hp=11c3efe901666678e461fd081e58d25ea7778ee2;hb=091a364c802e34a58f3260c9cb5db9b75c62215c;hpb=2672953bde548f3648eb6a24dbda415604262cea

diff --git a/src/network/networkd-manager.c b/src/network/networkd-manager.c
index 11c3efe90..2e3b4bb88 100644
--- a/src/network/networkd-manager.c
+++ b/src/network/networkd-manager.c
@@ -19,10 +19,62 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  ***/
 
+#include <sys/socket.h>
+#include <linux/if.h>
+#include <libkmod.h>
+
+#include "conf-parser.h"
 #include "path-util.h"
 #include "networkd.h"
+#include "network-internal.h"
 #include "libudev-private.h"
 #include "udev-util.h"
+#include "rtnl-util.h"
+#include "mkdir.h"
+#include "virt.h"
+
+#include "sd-rtnl.h"
+
+const char* const network_dirs[] = {
+        "/etc/systemd/network",
+        "/run/systemd/network",
+        "/usr/lib/systemd/network",
+#ifdef HAVE_SPLIT_USR
+        "/lib/systemd/network",
+#endif
+        NULL};
+
+static int dispatch_sigterm(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) {
+        Manager *m = userdata;
+
+        assert(m);
+
+        log_received_signal(LOG_INFO, si);
+
+        sd_event_exit(m->event, 0);
+        return 0;
+}
+
+static int setup_signals(Manager *m) {
+        sigset_t mask;
+        int r;
+
+        assert(m);
+
+        assert_se(sigemptyset(&mask) == 0);
+        sigset_add_many(&mask, SIGINT, SIGTERM, -1);
+        assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
+
+        r = sd_event_add_signal(m->event, &m->sigterm_event_source, SIGTERM, dispatch_sigterm, m);
+        if (r < 0)
+                return r;
+
+        r = sd_event_add_signal(m->event, &m->sigint_event_source, SIGINT, dispatch_sigterm, m);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
 
 int manager_new(Manager **ret) {
         _cleanup_manager_free_ Manager *m = NULL;
@@ -32,47 +84,56 @@ int manager_new(Manager **ret) {
         if (!m)
                 return -ENOMEM;
 
+        m->state_file = strdup("/run/systemd/network/state");
+        if (!m->state_file)
+                return -ENOMEM;
+
         r = sd_event_default(&m->event);
         if (r < 0)
                 return r;
 
         sd_event_set_watchdog(m->event, true);
 
-        r = sd_rtnl_open(RTMGRP_LINK | RTMGRP_IPV4_IFADDR, &m->rtnl);
+        r = sd_rtnl_open(&m->rtnl, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR,
+                         RTNLGRP_IPV6_IFADDR);
         if (r < 0)
                 return r;
 
-        m->udev = udev_new();
-        if (!m->udev)
-                return -ENOMEM;
+        r = sd_bus_default_system(&m->bus);
+        if (r < 0 && r != -ENOENT) /* TODO: drop when we can rely on kdbus */
+                return r;
+
+        r = setup_signals(m);
+        if (r < 0)
+                return r;
+
+        /* udev does not initialize devices inside containers,
+         * so we rely on them being already initialized before
+         * entering the container */
+        if (detect_container(NULL) <= 0) {
+                m->udev = udev_new();
+                if (!m->udev)
+                        return -ENOMEM;
+
+                m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
+                if (!m->udev_monitor)
+                        return -ENOMEM;
+        }
 
-        m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
-        if (!m->udev_monitor)
+        m->kmod_ctx = kmod_new(NULL, NULL);
+        if (!m->kmod_ctx)
                 return -ENOMEM;
 
         m->links = hashmap_new(uint64_hash_func, uint64_compare_func);
         if (!m->links)
                 return -ENOMEM;
 
-        m->bridges = hashmap_new(string_hash_func, string_compare_func);
-        if (!m->bridges)
+        m->netdevs = hashmap_new(string_hash_func, string_compare_func);
+        if (!m->netdevs)
                 return -ENOMEM;
 
         LIST_HEAD_INIT(m->networks);
 
-        m->network_dirs = strv_new("/etc/systemd/network/",
-                        "/run/systemd/network/",
-                        "/usr/lib/systemd/network",
-#ifdef HAVE_SPLIT_USER
-                        "/lib/systemd/network",
-#endif
-                        NULL);
-        if (!m->network_dirs)
-                return -ENOMEM;
-
-        if (!path_strv_canonicalize_uniq(m->network_dirs))
-                return -ENOMEM;
-
         *ret = m;
         m = NULL;
 
@@ -81,26 +142,34 @@ int manager_new(Manager **ret) {
 
 void manager_free(Manager *m) {
         Network *network;
-        Bridge *bridge;
+        NetDev *netdev;
         Link *link;
 
+        if (!m)
+                return;
+
+        free(m->state_file);
+
+        kmod_unref(m->kmod_ctx);
         udev_monitor_unref(m->udev_monitor);
         udev_unref(m->udev);
+        sd_bus_unref(m->bus);
         sd_event_source_unref(m->udev_event_source);
+        sd_event_source_unref(m->sigterm_event_source);
+        sd_event_source_unref(m->sigint_event_source);
         sd_event_unref(m->event);
 
-        while ((network = m->networks))
-                network_free(network);
-
         while ((link = hashmap_first(m->links)))
-                link_free(link);
+                link_unref(link);
         hashmap_free(m->links);
 
-        while ((bridge = hashmap_first(m->bridges)))
-                bridge_free(bridge);
-        hashmap_free(m->bridges);
+        while ((network = m->networks))
+                network_free(network);
+
+        while ((netdev = hashmap_first(m->netdevs)))
+                netdev_unref(netdev);
+        hashmap_free(m->netdevs);
 
-        strv_free(m->network_dirs);
         sd_rtnl_unref(m->rtnl);
 
         free(m);
@@ -110,9 +179,9 @@ int manager_load_config(Manager *m) {
         int r;
 
         /* update timestamp */
-        paths_check_timestamp(m->network_dirs, &m->network_dirs_ts_usec, true);
+        paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
 
-        r = bridge_load(m);
+        r = netdev_load(m);
         if (r < 0)
                 return r;
 
@@ -124,74 +193,140 @@ int manager_load_config(Manager *m) {
 }
 
 bool manager_should_reload(Manager *m) {
-        return paths_check_timestamp(m->network_dirs, &m->network_dirs_ts_usec, false);
+        return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
 }
 
-static int manager_process_link(Manager *m, struct udev_device *device) {
-        Link *link;
-        int r;
-
-        if (streq_ptr(udev_device_get_action(device), "remove")) {
-                uint64_t ifindex;
+static int manager_udev_process_link(Manager *m, struct udev_device *device) {
+        Link *link = NULL;
+        int r, ifindex;
 
-                log_debug("%s: link removed", udev_device_get_sysname(device));
+        assert(m);
+        assert(device);
 
-                ifindex = udev_device_get_ifindex(device);
-                link = hashmap_get(m->links, &ifindex);
-                if (!link)
-                        return 0;
+        if (!streq_ptr(udev_device_get_action(device), "add"))
+                return 0;
 
-                link_free(link);
-        } else {
-                r = link_add(m, device);
-                if (r < 0) {
-                        if (r == -EEXIST)
-                                log_debug("%s: link already exists, ignoring",
-                                          udev_device_get_sysname(device));
-                        else
-                                log_error("%s: could not handle link: %s",
-                                          udev_device_get_sysname(device),
-                                          strerror(-r));
-                } else
-                        log_debug("%s: link added", udev_device_get_sysname(device));
+        ifindex = udev_device_get_ifindex(device);
+        if (ifindex <= 0) {
+                log_debug("ignoring udev ADD event for device with invalid ifindex");
+                return 0;
         }
 
+        r = link_get(m, ifindex, &link);
+        if (r == -ENODEV)
+                return 0;
+        else if (r < 0)
+                return r;
+
+        r = link_initialized(link, device);
+        if (r < 0)
+                return r;
+
         return 0;
 }
 
-int manager_udev_enumerate_links(Manager *m) {
-        _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
-        struct udev_list_entry *item = NULL, *first = NULL;
-        int r;
+static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
+        Manager *m = userdata;
+        Link *link = NULL;
+        NetDev *netdev = NULL;
+        uint16_t type;
+        char *name;
+        int r, ifindex;
 
+        assert(rtnl);
+        assert(message);
         assert(m);
 
-        e = udev_enumerate_new(m->udev);
-        if (!e)
-                return -ENOMEM;
+        r = sd_rtnl_message_get_type(message, &type);
+        if (r < 0) {
+                log_warning("rtnl: could not get message type");
+                return 0;
+        }
+
+        r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
+        if (r < 0 || ifindex <= 0) {
+                log_warning("rtnl: received link message without valid ifindex");
+                return 0;
+        } else
+                link_get(m, ifindex, &link);
+
+        r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name);
+        if (r < 0 || !name) {
+                log_warning("rtnl: received link message without valid ifname");
+                return 0;
+        } else
+                netdev_get(m, name, &netdev);
+
+        switch (type) {
+        case RTM_NEWLINK:
+                if (!link) {
+                        /* link is new, so add it */
+                        r = link_add(m, message, &link);
+                        if (r < 0) {
+                                log_debug("could not add new link");
+                                return 0;
+                        }
+                }
+
+                if (netdev) {
+                        /* netdev exists, so make sure the ifindex matches */
+                        r = netdev_set_ifindex(netdev, message);
+                        if (r < 0) {
+                                log_debug("could not set ifindex on netdev");
+                                return 0;
+                        }
+                }
+
+                r = link_update(link, message);
+                if (r < 0)
+                        return 0;
+
+                break;
+
+        case RTM_DELLINK:
+                link_drop(link);
+                netdev_drop(netdev);
+
+                break;
+
+        default:
+                assert_not_reached("Received invalid RTNL message type.");
+        }
+
+        return 1;
+}
+
+int manager_rtnl_enumerate_links(Manager *m) {
+        _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
+        sd_rtnl_message *link;
+        int r, k;
 
-        r = udev_enumerate_add_match_subsystem(e, "net");
+        assert(m);
+        assert(m->rtnl);
+
+        r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
         if (r < 0)
                 return r;
 
-        r = udev_enumerate_add_match_is_initialized(e);
+        r = sd_rtnl_message_request_dump(req, true);
         if (r < 0)
                 return r;
 
-        r = udev_enumerate_scan_devices(e);
+        r = sd_rtnl_call(m->rtnl, req, 0, &reply);
         if (r < 0)
                 return r;
 
-        first = udev_enumerate_get_list_entry(e);
-        udev_list_entry_foreach(item, first) {
-                _cleanup_udev_device_unref_ struct udev_device *d = NULL;
-                int k;
+        for (link = reply; link; link = sd_rtnl_message_next(link)) {
+                uint16_t type;
 
-                d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
-                if (!d)
-                        return -ENOMEM;
+                k = sd_rtnl_message_get_type(link, &type);
+                if (k < 0)
+                        return k;
+
+                if (type != RTM_NEWLINK)
+                        continue;
 
-                k = manager_process_link(m, d);
+                k = manager_rtnl_process_link(m->rtnl, link, m);
                 if (k < 0)
                         r = k;
         }
@@ -208,13 +343,18 @@ static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t
         if (!device)
                 return -ENOMEM;
 
-        manager_process_link(m, device);
+        manager_udev_process_link(m, device);
         return 0;
 }
 
 int manager_udev_listen(Manager *m) {
         int r;
 
+        if (detect_container(NULL) > 0)
+                return 0;
+
+        assert(m->udev_monitor);
+
         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
         if (r < 0) {
                 log_error("Could not add udev monitor filter: %s", strerror(-r));
@@ -228,53 +368,105 @@ int manager_udev_listen(Manager *m) {
         }
 
         r = sd_event_add_io(m->event,
+                        &m->udev_event_source,
                         udev_monitor_get_fd(m->udev_monitor),
                         EPOLLIN, manager_dispatch_link_udev,
-                        m, &m->udev_event_source);
+                        m);
         if (r < 0)
                 return r;
 
         return 0;
 }
 
-static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
-        Manager *m = userdata;
-        Link *link;
-        int r, ifindex;
+int manager_rtnl_listen(Manager *m) {
+        int r;
 
-        r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
-        if (r < 0) {
-                log_debug("received RTM_NEWLINK message without valid ifindex");
-                return 0;
-        }
+        r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
+        if (r < 0)
+                return r;
 
-        link = hashmap_get(m->links, &ifindex);
-        if (!link) {
-                log_debug("received RTM_NEWLINK message for ifindex we are not tracking (%d)", ifindex);
-                return 0;
-        }
+        r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
+        if (r < 0)
+                return r;
 
-        /* only track the status of links we want to manage */
-        if (link->network) {
-                r = link_update(link, message);
-                if (r < 0)
-                        return 0;
-        } else
-                log_debug("received RTM_NEWLINK message for link we are not managing (%d)", ifindex);
+        r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m);
+        if (r < 0)
+                return r;
 
-        return 1;
+        r = sd_rtnl_add_match(m->rtnl, RTM_NEWADDR, &link_rtnl_process_address, m);
+        if (r < 0)
+                return r;
+
+        r = sd_rtnl_add_match(m->rtnl, RTM_DELADDR, &link_rtnl_process_address, m);
+        if (r < 0)
+                return r;
+
+        return 0;
 }
 
-int manager_rtnl_listen(Manager *m) {
+int manager_bus_listen(Manager *m) {
         int r;
 
-        r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
-        if (r < 0)
-                return r;
+        assert(m->event);
 
-        r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
+        if (!m->bus) /* TODO: drop when we can rely on kdbus */
+                return 0;
+
+        r = sd_bus_attach_event(m->bus, m->event, 0);
         if (r < 0)
                 return r;
 
         return 0;
 }
+
+int manager_save(Manager *m) {
+        Link *link;
+        Iterator i;
+        _cleanup_free_ char *temp_path = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        const char *oper_state = "unknown";
+        bool dormant = false, carrier = false;
+        int r;
+
+        assert(m);
+        assert(m->state_file);
+
+        HASHMAP_FOREACH(link, m->links, i) {
+                if (link->flags & IFF_LOOPBACK)
+                        continue;
+
+                if (link_has_carrier(link->flags, link->operstate))
+                        carrier = true;
+                else if (link->operstate == IF_OPER_DORMANT)
+                        dormant = true;
+        }
+
+        if (carrier)
+                oper_state = "carrier";
+        else if (dormant)
+                oper_state = "dormant";
+
+        r = fopen_temporary(m->state_file, &f, &temp_path);
+        if (r < 0)
+                goto finish;
+
+        fchmod(fileno(f), 0644);
+
+        fprintf(f,
+                "# This is private data. Do not parse.\n"
+                "OPER_STATE=%s\n", oper_state);
+
+        fflush(f);
+
+        if (ferror(f) || rename(temp_path, m->state_file) < 0) {
+                r = -errno;
+                unlink(m->state_file);
+                unlink(temp_path);
+        }
+
+finish:
+        if (r < 0)
+                log_error("Failed to save network state to %s: %s", m->state_file, strerror(-r));
+
+        return r;
+}