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