From b750101eb236130cf056c675997decbac904cc49 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 17:35:18 +0200 Subject: Adding upstream version 252.22. Signed-off-by: Daniel Baumann --- src/network/wait-online/manager.c | 417 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 417 insertions(+) create mode 100644 src/network/wait-online/manager.c (limited to 'src/network/wait-online/manager.c') 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 +#include +#include + +#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); +} -- cgit v1.2.3