Adding upstream version 252.22.upstream/252.22

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

1 files changed, 417 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..cd4009e
--- /dev/null
+++ b/src/network/wait-online/manager.c
@@ -0,0 +1,417 @@
+/* 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"
+#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->command_line_interfaces_by_name &&
+            !hashmap_contains(m->command_line_interfaces_by_name, link->ifname))
+                return true;
+
+        if (!link->required_for_online)
+                return true;
+
+        /* ignore interfaces we explicitly are asked to ignore */
+        return strv_fnmatch(m->ignored_interfaces, link->ifname);
+}
+
+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 (!hashmap_contains(m->command_line_interfaces_by_name, l->ifname)) {
+                        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 });
+                if (r < 0 && !m->any) /* Unlike the above loop, unmanaged interfaces are ignored here. */
+                        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 %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)
+                        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);
+}