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-rw-r--r--src/network/wait-online/manager.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/src/network/wait-online/manager.c b/src/network/wait-online/manager.c
new file mode 100644
index 0000000..79994bd
--- /dev/null
+++ b/src/network/wait-online/manager.c
@@ -0,0 +1,369 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <netinet/ether.h>
+#include <linux/if.h>
+#include <fnmatch.h>
+
+#include "alloc-util.h"
+#include "link.h"
+#include "manager.h"
+#include "netlink-util.h"
+#include "network-internal.h"
+#include "strv.h"
+#include "time-util.h"
+#include "util.h"
+
+static bool manager_ignore_link(Manager *m, Link *link) {
+ assert(m);
+ assert(link);
+
+ /* always ignore the loopback interface */
+ if (link->flags & IFF_LOOPBACK)
+ return true;
+
+ /* if interfaces are given on the command line, ignore all others */
+ if (m->interfaces && !hashmap_contains(m->interfaces, link->ifname))
+ return true;
+
+ if (!link->required_for_online)
+ return true;
+
+ /* ignore interfaces we explicitly are asked to ignore */
+ return strv_fnmatch(m->ignore, link->ifname);
+}
+
+static int manager_link_is_online(Manager *m, Link *l, LinkOperationalStateRange s) {
+ /* This returns the following:
+ * -EAGAIN: not processed by udev or networkd
+ * 0: operstate is not enough
+ * 1: online */
+
+ if (!l->state)
+ return log_link_debug_errno(l, SYNTHETIC_ERRNO(EAGAIN),
+ "link has not yet been processed by udev");
+
+ if (STR_IN_SET(l->state, "configuring", "pending"))
+ return log_link_debug_errno(l, SYNTHETIC_ERRNO(EAGAIN),
+ "link is being processed by networkd");
+
+ if (s.min < 0)
+ s.min = m->required_operstate.min >= 0 ? m->required_operstate.min
+ : l->required_operstate.min;
+
+ if (s.max < 0)
+ s.max = m->required_operstate.max >= 0 ? m->required_operstate.max
+ : l->required_operstate.max;
+
+ if (l->operational_state < s.min || l->operational_state > s.max) {
+ log_link_debug(l, "Operational state '%s' is not in range ['%s':'%s']",
+ link_operstate_to_string(l->operational_state),
+ link_operstate_to_string(s.min), link_operstate_to_string(s.max));
+ return 0;
+ }
+
+ return 1;
+}
+
+bool manager_configured(Manager *m) {
+ bool one_ready = false;
+ const char *ifname;
+ void *p;
+ Link *l;
+ int r;
+
+ if (!hashmap_isempty(m->interfaces)) {
+ /* wait for all the links given on the command line to appear */
+ HASHMAP_FOREACH_KEY(p, ifname, m->interfaces) {
+ LinkOperationalStateRange *range = p;
+
+ l = hashmap_get(m->links_by_name, ifname);
+ if (!l && range->min == LINK_OPERSTATE_MISSING) {
+ one_ready = true;
+ continue;
+ }
+
+ if (!l) {
+ log_debug("still waiting for %s", ifname);
+ if (!m->any)
+ return false;
+ continue;
+ }
+
+ if (manager_link_is_online(m, l, *range) <= 0) {
+ if (!m->any)
+ return false;
+ continue;
+ }
+
+ one_ready = true;
+ }
+
+ /* all interfaces given by the command line are online, or
+ * one of the specified interfaces is online. */
+ return one_ready;
+ }
+
+ /* wait for all links networkd manages to be in admin state 'configured'
+ * and at least one link to gain a carrier */
+ HASHMAP_FOREACH(l, m->links) {
+ if (manager_ignore_link(m, l)) {
+ log_link_debug(l, "link is ignored");
+ continue;
+ }
+
+ r = manager_link_is_online(m, l,
+ (LinkOperationalStateRange) { _LINK_OPERSTATE_INVALID,
+ _LINK_OPERSTATE_INVALID });
+ if (r < 0 && !m->any)
+ return false;
+ if (r > 0)
+ /* we wait for at least one link to be ready,
+ * regardless of who manages it */
+ one_ready = true;
+ }
+
+ return one_ready;
+}
+
+static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
+ Manager *m = userdata;
+ uint16_t type;
+ Link *l;
+ const char *ifname;
+ int ifindex, r;
+
+ assert(rtnl);
+ assert(m);
+ assert(mm);
+
+ r = sd_netlink_message_get_type(mm, &type);
+ if (r < 0) {
+ log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
+ return 0;
+ }
+
+ r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
+ if (r < 0) {
+ log_warning_errno(r, "rtnl: Could not get ifindex from link, ignoring: %m");
+ return 0;
+ } else if (ifindex <= 0) {
+ log_warning("rtnl: received link message with invalid ifindex %d, ignoring", ifindex);
+ return 0;
+ }
+
+ r = sd_netlink_message_read_string(mm, IFLA_IFNAME, &ifname);
+ if (r < 0) {
+ log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
+ return 0;
+ }
+
+ l = hashmap_get(m->links, INT_TO_PTR(ifindex));
+
+ switch (type) {
+
+ case RTM_NEWLINK:
+ if (!l) {
+ log_debug("Found link %i", ifindex);
+
+ r = link_new(m, &l, ifindex, ifname);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create link object: %m");
+ }
+
+ r = link_update_rtnl(l, mm);
+ if (r < 0)
+ log_link_warning_errno(l, r, "Failed to process RTNL link message, ignoring: %m");
+
+ r = link_update_monitor(l);
+ if (r < 0 && r != -ENODATA)
+ log_link_warning_errno(l, r, "Failed to update link state, ignoring: %m");
+
+ break;
+
+ case RTM_DELLINK:
+ if (l) {
+ log_link_debug(l, "Removing link");
+ link_free(l);
+ }
+
+ break;
+ }
+
+ return 0;
+}
+
+static int on_rtnl_event(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
+ Manager *m = userdata;
+ int r;
+
+ r = manager_process_link(rtnl, mm, m);
+ if (r < 0)
+ return r;
+
+ if (manager_configured(m))
+ sd_event_exit(m->event, 0);
+
+ return 1;
+}
+
+static int manager_rtnl_listen(Manager *m) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
+ sd_netlink_message *i;
+ int r;
+
+ assert(m);
+
+ /* First, subscribe to interfaces coming and going */
+ r = sd_netlink_open(&m->rtnl);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_attach_event(m->rtnl, m->event, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, on_rtnl_event, NULL, m, "wait-online-on-NEWLINK");
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, on_rtnl_event, NULL, m, "wait-online-on-DELLINK");
+ if (r < 0)
+ return r;
+
+ /* Then, enumerate all links */
+ r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_message_request_dump(req, true);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_call(m->rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
+
+ for (i = reply; i; i = sd_netlink_message_next(i)) {
+ r = manager_process_link(m->rtnl, i, m);
+ if (r < 0)
+ return r;
+ }
+
+ return r;
+}
+
+static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ Manager *m = userdata;
+ Link *l;
+ int r;
+
+ assert(m);
+
+ sd_network_monitor_flush(m->network_monitor);
+
+ HASHMAP_FOREACH(l, m->links) {
+ r = link_update_monitor(l);
+ if (r < 0 && r != -ENODATA)
+ log_link_warning_errno(l, r, "Failed to update link state, ignoring: %m");
+ }
+
+ if (manager_configured(m))
+ sd_event_exit(m->event, 0);
+
+ return 0;
+}
+
+static int manager_network_monitor_listen(Manager *m) {
+ int r, fd, events;
+
+ assert(m);
+
+ r = sd_network_monitor_new(&m->network_monitor, NULL);
+ if (r < 0)
+ return r;
+
+ fd = sd_network_monitor_get_fd(m->network_monitor);
+ if (fd < 0)
+ return fd;
+
+ events = sd_network_monitor_get_events(m->network_monitor);
+ if (events < 0)
+ return events;
+
+ r = sd_event_add_io(m->event, &m->network_monitor_event_source,
+ fd, events, &on_network_event, m);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int manager_new(Manager **ret, Hashmap *interfaces, char **ignore,
+ LinkOperationalStateRange required_operstate,
+ bool any, usec_t timeout) {
+ _cleanup_(manager_freep) Manager *m = NULL;
+ int r;
+
+ assert(ret);
+
+ m = new(Manager, 1);
+ if (!m)
+ return -ENOMEM;
+
+ *m = (Manager) {
+ .interfaces = interfaces,
+ .ignore = ignore,
+ .required_operstate = required_operstate,
+ .any = any,
+ };
+
+ r = sd_event_default(&m->event);
+ if (r < 0)
+ return r;
+
+ (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
+ (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
+
+ if (timeout > 0) {
+ usec_t usec;
+
+ usec = now(clock_boottime_or_monotonic()) + timeout;
+
+ r = sd_event_add_time(m->event, NULL, clock_boottime_or_monotonic(), usec, 0, NULL, INT_TO_PTR(-ETIMEDOUT));
+ if (r < 0)
+ return r;
+ }
+
+ sd_event_set_watchdog(m->event, true);
+
+ r = manager_network_monitor_listen(m);
+ if (r < 0)
+ return r;
+
+ r = manager_rtnl_listen(m);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(m);
+
+ return 0;
+}
+
+void manager_free(Manager *m) {
+ if (!m)
+ return;
+
+ hashmap_free_with_destructor(m->links, link_free);
+ hashmap_free(m->links_by_name);
+
+ sd_event_source_unref(m->network_monitor_event_source);
+ sd_network_monitor_unref(m->network_monitor);
+
+ sd_event_source_unref(m->rtnl_event_source);
+ sd_netlink_unref(m->rtnl);
+
+ sd_event_unref(m->event);
+ free(m);
+
+ return;
+}
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