src/network/wait-online/manager.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <netinet/ether.h>
   4 #include <linux/if.h>
   5 #include <fnmatch.h>
   6
   7 #include "alloc-util.h"
   8 #include "link.h"
   9 #include "manager.h"
  10 #include "netlink-util.h"
  11 #include "network-internal.h"
  12 #include "strv.h"
  13 #include "time-util.h"
  14 #include "util.h"
  15
  16 static bool manager_ignore_link(Manager *m, Link *link) {
  17         assert(m);
  18         assert(link);
  19
  20         /* always ignore the loopback interface */
  21         if (link->flags & IFF_LOOPBACK)
  22                 return true;
  23
  24         /* if interfaces are given on the command line, ignore all others */
  25         if (m->interfaces && !hashmap_contains(m->interfaces, link->ifname))
  26                 return true;
  27
  28         if (!link->required_for_online)
  29                 return true;
  30
  31         /* ignore interfaces we explicitly are asked to ignore */
  32         return strv_fnmatch(m->ignore, link->ifname, 0);
  33 }
  34
  35 static int manager_link_is_online(Manager *m, Link *l, LinkOperationalState s) {
  36         /* This returns the following:
  37          * -EAGAIN: not processed by udev or networkd
  38          *       0: operstate is not enough
  39          *       1: online */
  40
  41         if (!l->state) {
  42                 log_debug("link %s has not yet been processed by udev",
  43                           l->ifname);
  44                 return -EAGAIN;
  45         }
  46
  47         if (STR_IN_SET(l->state, "configuring", "pending")) {
  48                 log_debug("link %s is being processed by networkd",
  49                           l->ifname);
  50                 return -EAGAIN;
  51         }
  52
  53         if (s < 0)
  54                 s = m->required_operstate >= 0 ? m->required_operstate : l->required_operstate;
  55
  56         if (l->operational_state < s) {
  57                 log_debug("Operational state of link %s does not reach to %s",
  58                           l->ifname, link_operstate_to_string(s));
  59                 return 0;
  60         }
  61
  62         return 1;
  63 }
  64
  65 bool manager_all_configured(Manager *m) {
  66         bool one_ready = false;
  67         Iterator i;
  68         const char *ifname;
  69         void *p;
  70         Link *l;
  71         int r;
  72
  73         /* wait for all the links given on the command line to appear */
  74         HASHMAP_FOREACH_KEY(p, ifname, m->interfaces, i) {
  75                 LinkOperationalState s = PTR_TO_INT(p);
  76
  77                 l = hashmap_get(m->links_by_name, ifname);
  78                 if (!l) {
  79                         log_debug("still waiting for %s", ifname);
  80                         return false;
  81                 }
  82
  83                 if (manager_link_is_online(m, l, s) <= 0)
  84                         return false;
  85         }
  86
  87         if (!hashmap_isempty(m->interfaces))
  88                 /* all interfaces given by the command line are online. */
  89                 return true;
  90
  91         /* wait for all links networkd manages to be in admin state 'configured'
  92          * and at least one link to gain a carrier */
  93         HASHMAP_FOREACH(l, m->links, i) {
  94                 if (manager_ignore_link(m, l)) {
  95                         log_info("ignoring: %s", l->ifname);
  96                         continue;
  97                 }
  98
  99                 r = manager_link_is_online(m, l, _LINK_OPERSTATE_INVALID);
 100                 if (r < 0)
 101                         return false;
 102                 if (r > 0)
 103                         /* we wait for at least one link to be ready,
 104                          * regardless of who manages it */
 105                         one_ready = true;
 106         }
 107
 108         return one_ready;
 109 }
 110
 111 static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
 112         Manager *m = userdata;
 113         uint16_t type;
 114         Link *l;
 115         const char *ifname;
 116         int ifindex, r;
 117
 118         assert(rtnl);
 119         assert(m);
 120         assert(mm);
 121
 122         r = sd_netlink_message_get_type(mm, &type);
 123         if (r < 0) {
 124                 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
 125                 return 0;
 126         }
 127
 128         r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
 129         if (r < 0) {
 130                 log_warning_errno(r, "rtnl: Could not get ifindex from link, ignoring: %m");
 131                 return 0;
 132         } else if (ifindex <= 0) {
 133                 log_warning("rtnl: received link message with invalid ifindex %d, ignoring", ifindex);
 134                 return 0;
 135         }
 136
 137         r = sd_netlink_message_read_string(mm, IFLA_IFNAME, &ifname);
 138         if (r < 0) {
 139                 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
 140                 return 0;
 141         }
 142
 143         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
 144
 145         switch (type) {
 146
 147         case RTM_NEWLINK:
 148                 if (!l) {
 149                         log_debug("Found link %i", ifindex);
 150
 151                         r = link_new(m, &l, ifindex, ifname);
 152                         if (r < 0)
 153                                 return log_error_errno(r, "Failed to create link object: %m");
 154                 }
 155
 156                 r = link_update_rtnl(l, mm);
 157                 if (r < 0)
 158                         log_warning_errno(r, "Failed to process RTNL link message, ignoring: %m");
 159
 160                 r = link_update_monitor(l);
 161                 if (r < 0)
 162                         log_warning_errno(r, "Failed to initialize link object, ignoring: %m");
 163
 164                 break;
 165
 166         case RTM_DELLINK:
 167                 if (l) {
 168                         log_debug("Removing link %i", l->ifindex);
 169                         link_free(l);
 170                 }
 171
 172                 break;
 173         }
 174
 175         return 0;
 176 }
 177
 178 static int on_rtnl_event(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
 179         Manager *m = userdata;
 180         int r;
 181
 182         r = manager_process_link(rtnl, mm, m);
 183         if (r < 0)
 184                 return r;
 185
 186         if (manager_all_configured(m))
 187                 sd_event_exit(m->event, 0);
 188
 189         return 1;
 190 }
 191
 192 static int manager_rtnl_listen(Manager *m) {
 193         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
 194         sd_netlink_message *i;
 195         int r;
 196
 197         assert(m);
 198
 199         /* First, subscribe to interfaces coming and going */
 200         r = sd_netlink_open(&m->rtnl);
 201         if (r < 0)
 202                 return r;
 203
 204         r = sd_netlink_attach_event(m->rtnl, m->event, 0);
 205         if (r < 0)
 206                 return r;
 207
 208         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, on_rtnl_event, NULL, m, "wait-online-on-NEWLINK");
 209         if (r < 0)
 210                 return r;
 211
 212         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, on_rtnl_event, NULL, m, "wait-online-on-DELLINK");
 213         if (r < 0)
 214                 return r;
 215
 216         /* Then, enumerate all links */
 217         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 218         if (r < 0)
 219                 return r;
 220
 221         r = sd_netlink_message_request_dump(req, true);
 222         if (r < 0)
 223                 return r;
 224
 225         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 226         if (r < 0)
 227                 return r;
 228
 229         for (i = reply; i; i = sd_netlink_message_next(i)) {
 230                 r = manager_process_link(m->rtnl, i, m);
 231                 if (r < 0)
 232                         return r;
 233         }
 234
 235         return r;
 236 }
 237
 238 static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 239         Manager *m = userdata;
 240         Iterator i;
 241         Link *l;
 242         int r;
 243
 244         assert(m);
 245
 246         sd_network_monitor_flush(m->network_monitor);
 247
 248         HASHMAP_FOREACH(l, m->links, i) {
 249                 r = link_update_monitor(l);
 250                 if (r < 0)
 251                         log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
 252         }
 253
 254         if (manager_all_configured(m))
 255                 sd_event_exit(m->event, 0);
 256
 257         return 0;
 258 }
 259
 260 static int manager_network_monitor_listen(Manager *m) {
 261         int r, fd, events;
 262
 263         assert(m);
 264
 265         r = sd_network_monitor_new(&m->network_monitor, NULL);
 266         if (r < 0)
 267                 return r;
 268
 269         fd = sd_network_monitor_get_fd(m->network_monitor);
 270         if (fd < 0)
 271                 return fd;
 272
 273         events = sd_network_monitor_get_events(m->network_monitor);
 274         if (events < 0)
 275                 return events;
 276
 277         r = sd_event_add_io(m->event, &m->network_monitor_event_source,
 278                             fd, events, &on_network_event, m);
 279         if (r < 0)
 280                 return r;
 281
 282         return 0;
 283 }
 284
 285 int manager_new(Manager **ret, Hashmap *interfaces, char **ignore,
 286                 LinkOperationalState required_operstate, usec_t timeout) {
 287         _cleanup_(manager_freep) Manager *m = NULL;
 288         int r;
 289
 290         assert(ret);
 291
 292         m = new(Manager, 1);
 293         if (!m)
 294                 return -ENOMEM;
 295
 296         *m = (Manager) {
 297                 .interfaces = interfaces,
 298                 .ignore = ignore,
 299                 .required_operstate = required_operstate,
 300         };
 301
 302         r = sd_event_default(&m->event);
 303         if (r < 0)
 304                 return r;
 305
 306         (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL,  NULL);
 307         (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
 308
 309         if (timeout > 0) {
 310                 usec_t usec;
 311
 312                 usec = now(clock_boottime_or_monotonic()) + timeout;
 313
 314                 r = sd_event_add_time(m->event, NULL, clock_boottime_or_monotonic(), usec, 0, NULL, INT_TO_PTR(-ETIMEDOUT));
 315                 if (r < 0)
 316                         return r;
 317         }
 318
 319         sd_event_set_watchdog(m->event, true);
 320
 321         r = manager_network_monitor_listen(m);
 322         if (r < 0)
 323                 return r;
 324
 325         r = manager_rtnl_listen(m);
 326         if (r < 0)
 327                 return r;
 328
 329         *ret = TAKE_PTR(m);
 330
 331         return 0;
 332 }
 333
 334 void manager_free(Manager *m) {
 335         if (!m)
 336                 return;
 337
 338         hashmap_free_with_destructor(m->links, link_free);
 339         hashmap_free(m->links_by_name);
 340
 341         sd_event_source_unref(m->network_monitor_event_source);
 342         sd_network_monitor_unref(m->network_monitor);
 343
 344         sd_event_source_unref(m->rtnl_event_source);
 345         sd_netlink_unref(m->rtnl);
 346
 347         sd_event_unref(m->event);
 348         free(m);
 349
 350         return;
 351 }