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-rw-r--r--src/network/wait-online/manager.c441
1 files changed, 441 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..40a9fba
--- /dev/null
+++ b/src/network/wait-online/manager.c
@@ -0,0 +1,441 @@
+/* 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 "strv.h"
+#include "time-util.h"
+
+static bool link_in_command_line_interfaces(Link *link, Manager *m) {
+ assert(link);
+ assert(m);
+
+ if (hashmap_contains(m->command_line_interfaces_by_name, link->ifname))
+ return true;
+
+ STRV_FOREACH(n, link->altnames)
+ if (hashmap_contains(m->command_line_interfaces_by_name, *n))
+ return true;
+
+ return false;
+}
+
+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->command_line_interfaces_by_name &&
+ !link_in_command_line_interfaces(link, m))
+ return true;
+
+ if (!link->required_for_online)
+ return true;
+
+ /* ignore interfaces we explicitly are asked to ignore */
+ if (strv_fnmatch(m->ignored_interfaces, link->ifname))
+ return true;
+
+ STRV_FOREACH(n, link->altnames)
+ if (strv_fnmatch(m->ignored_interfaces, *n))
+ return true;
+
+ return false;
+}
+
+static int manager_link_is_online(Manager *m, Link *l, LinkOperationalStateRange s) {
+ AddressFamily required_family;
+ bool needs_ipv4;
+ bool needs_ipv6;
+
+ assert(m);
+ assert(l);
+
+ /* This returns the following:
+ * -EAGAIN : not processed by udev
+ * -EBUSY : being processed by networkd
+ * -EADDRNOTAVAIL: requested conditions (operstate and/or addresses) are not satisfied
+ * false : unmanaged
+ * true : online */
+
+ if (!l->state || streq(l->state, "pending"))
+ /* If no state string exists, networkd (and possibly also udevd) has not detected the
+ * interface yet, that mean we cannot determine whether the interface is managed or
+ * not. Hence, return negative value.
+ * If the link is in pending state, then udevd has not processed the link, and networkd
+ * has not tried to find .network file for the link. Hence, return negative value. */
+ return log_link_debug_errno(l, SYNTHETIC_ERRNO(EAGAIN),
+ "link has not yet been processed by udev: setup state is %s.",
+ strna(l->state));
+
+ if (streq(l->state, "unmanaged")) {
+ /* If the link is in unmanaged state, then ignore the interface unless the interface is
+ * specified in '--interface/-i' option. */
+ if (!link_in_command_line_interfaces(l, m)) {
+ log_link_debug(l, "link is not managed by networkd.");
+ return false;
+ }
+
+ } else if (!streq(l->state, "configured"))
+ /* If the link is in non-configured state, return negative value here. */
+ return log_link_debug_errno(l, SYNTHETIC_ERRNO(EBUSY),
+ "link is being processed by networkd: setup state is %s.",
+ l->state);
+
+ 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)
+ return log_link_debug_errno(l, SYNTHETIC_ERRNO(EADDRNOTAVAIL),
+ "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));
+
+ required_family = m->required_family > 0 ? m->required_family : l->required_family;
+ needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
+ needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
+
+ if (s.min < LINK_OPERSTATE_ROUTABLE) {
+ if (needs_ipv4 && l->ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
+ return log_link_debug_errno(l, SYNTHETIC_ERRNO(EADDRNOTAVAIL),
+ "No routable or link-local IPv4 address is configured.");
+
+ if (needs_ipv6 && l->ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
+ return log_link_debug_errno(l, SYNTHETIC_ERRNO(EADDRNOTAVAIL),
+ "No routable or link-local IPv6 address is configured.");
+ } else {
+ if (needs_ipv4 && l->ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
+ return log_link_debug_errno(l, SYNTHETIC_ERRNO(EADDRNOTAVAIL),
+ "No routable IPv4 address is configured.");
+
+ if (needs_ipv6 && l->ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
+ return log_link_debug_errno(l, SYNTHETIC_ERRNO(EADDRNOTAVAIL),
+ "No routable IPv6 address is configured.");
+ }
+
+ log_link_debug(l, "link is configured by networkd and online.");
+ return true;
+}
+
+bool manager_configured(Manager *m) {
+ Link *l;
+ int r;
+
+ if (!hashmap_isempty(m->command_line_interfaces_by_name)) {
+ LinkOperationalStateRange *range;
+ const char *ifname;
+
+ /* wait for all the links given on the command line to appear */
+ HASHMAP_FOREACH_KEY(range, ifname, m->command_line_interfaces_by_name) {
+
+ l = hashmap_get(m->links_by_name, ifname);
+ if (!l) {
+ if (range->min == LINK_OPERSTATE_MISSING) {
+ if (m->any)
+ return true;
+ } else {
+ log_debug("still waiting for %s", ifname);
+ if (!m->any)
+ return false;
+ }
+ continue;
+ }
+
+ r = manager_link_is_online(m, l, *range);
+ if (r <= 0 && !m->any)
+ return false;
+ if (r > 0 && m->any)
+ return true;
+ }
+
+ /* With '--any' : no interface is ready → return false
+ * Without '--any': all interfaces are ready → return true */
+ return !m->any;
+ }
+
+ /* wait for all links networkd manages */
+ bool has_online = false;
+ HASHMAP_FOREACH(l, m->links_by_index) {
+ 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 });
+ /* Unlike the above loop, unmanaged interfaces are ignored here. Also, Configured but offline
+ * interfaces are ignored. See issue #29506. */
+ if (r < 0 && r != -EADDRNOTAVAIL && !m->any)
+ return false;
+ if (r > 0) {
+ if (m->any)
+ return true;
+ has_online = true;
+ }
+ }
+
+ /* With '--any' : no interface is ready → return false
+ * Without '--any': all interfaces are ready or unmanaged
+ *
+ * In this stage, drivers for interfaces may not be loaded yet, and there may be only lo.
+ * To avoid that wait-online exits earlier than that drivers are loaded, let's request at least one
+ * managed online interface exists. See issue #27822. */
+ return !m->any && has_online;
+}
+
+static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
+ Manager *m = ASSERT_PTR(userdata);
+ uint16_t type;
+ Link *l;
+ const char *ifname;
+ int ifindex, r;
+
+ assert(rtnl);
+ 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_by_index, INT_TO_PTR(ifindex));
+
+ switch (type) {
+
+ case RTM_NEWLINK:
+ if (!l) {
+ log_debug("Found link %s(%i)", ifname, ifindex);
+
+ r = link_new(m, &l, ifindex, ifname);
+ if (r < 0) {
+ log_warning_errno(r, "Failed to create link object for %s(%i), ignoring: %m", ifname, ifindex);
+ return 0;
+ }
+ }
+
+ 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)
+ log_link_full_errno(l, IN_SET(r, -ENODATA, -ENOENT) ? LOG_DEBUG : LOG_WARNING, 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;
+ 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_set_request_dump(req, true);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_call(m->rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
+
+ for (sd_netlink_message *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 = ASSERT_PTR(userdata);
+ Link *l;
+ int r;
+
+ sd_network_monitor_flush(m->network_monitor);
+
+ HASHMAP_FOREACH(l, m->links_by_index) {
+ r = link_update_monitor(l);
+ if (r < 0)
+ log_link_full_errno(l, IN_SET(r, -ENODATA, -ENOENT) ? LOG_DEBUG : LOG_WARNING, 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 *command_line_interfaces_by_name,
+ char **ignored_interfaces,
+ LinkOperationalStateRange required_operstate,
+ AddressFamily required_family,
+ 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) {
+ .command_line_interfaces_by_name = command_line_interfaces_by_name,
+ .ignored_interfaces = ignored_interfaces,
+ .required_operstate = required_operstate,
+ .required_family = required_family,
+ .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) {
+ r = sd_event_add_time_relative(m->event, NULL, CLOCK_BOOTTIME, timeout, 0, NULL, INT_TO_PTR(-ETIMEDOUT));
+ if (r < 0 && r != -EOVERFLOW)
+ 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;
+}
+
+Manager* manager_free(Manager *m) {
+ if (!m)
+ return NULL;
+
+ hashmap_free_with_destructor(m->links_by_index, 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);
+
+ return mfree(m);
+}
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