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 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 && !strv_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 bool manager_all_configured(Manager *m) {
  36         Iterator i;
  37         Link *l;
  38         char **ifname;
  39         bool one_ready = false;
  40
  41         /* wait for all the links given on the command line to appear */
  42         STRV_FOREACH(ifname, m->interfaces) {
  43                 l = hashmap_get(m->links_by_name, *ifname);
  44                 if (!l) {
  45                         log_debug("still waiting for %s", *ifname);
  46                         return false;
  47                 }
  48         }
  49
  50         /* wait for all links networkd manages to be in admin state 'configured'
  51            and at least one link to gain a carrier */
  52         HASHMAP_FOREACH(l, m->links, i) {
  53                 if (manager_ignore_link(m, l)) {
  54                         log_info("ignoring: %s", l->ifname);
  55                         continue;
  56                 }
  57
  58                 if (!l->state) {
  59                         log_debug("link %s has not yet been processed by udev",
  60                                   l->ifname);
  61                         return false;
  62                 }
  63
  64                 if (STR_IN_SET(l->state, "configuring", "pending")) {
  65                         log_debug("link %s is being processed by networkd",
  66                                   l->ifname);
  67                         return false;
  68                 }
  69
  70                 if (l->operational_state &&
  71                     STR_IN_SET(l->operational_state, "degraded", "routable"))
  72                         /* we wait for at least one link to be ready,
  73                            regardless of who manages it */
  74                         one_ready = true;
  75         }
  76
  77         return one_ready;
  78 }
  79
  80 static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
  81         Manager *m = userdata;
  82         uint16_t type;
  83         Link *l;
  84         const char *ifname;
  85         int ifindex, r;
  86
  87         assert(rtnl);
  88         assert(m);
  89         assert(mm);
  90
  91         r = sd_netlink_message_get_type(mm, &type);
  92         if (r < 0)
  93                 goto fail;
  94
  95         r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
  96         if (r < 0)
  97                 goto fail;
  98
  99         r = sd_netlink_message_read_string(mm, IFLA_IFNAME, &ifname);
 100         if (r < 0)
 101                 goto fail;
 102
 103         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
 104
 105         switch (type) {
 106
 107         case RTM_NEWLINK:
 108                 if (!l) {
 109                         log_debug("Found link %i", ifindex);
 110
 111                         r = link_new(m, &l, ifindex, ifname);
 112                         if (r < 0)
 113                                 goto fail;
 114
 115                         r = link_update_monitor(l);
 116                         if (r < 0)
 117                                 goto fail;
 118                 }
 119
 120                 r = link_update_rtnl(l, mm);
 121                 if (r < 0)
 122                         goto fail;
 123
 124                 break;
 125
 126         case RTM_DELLINK:
 127                 if (l) {
 128                         log_debug("Removing link %i", l->ifindex);
 129                         link_free(l);
 130                 }
 131
 132                 break;
 133         }
 134
 135         return 0;
 136
 137 fail:
 138         log_warning_errno(r, "Failed to process RTNL link message: %m");
 139         return 0;
 140 }
 141
 142 static int on_rtnl_event(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
 143         Manager *m = userdata;
 144         int r;
 145
 146         r = manager_process_link(rtnl, mm, m);
 147         if (r < 0)
 148                 return r;
 149
 150         if (manager_all_configured(m))
 151                 sd_event_exit(m->event, 0);
 152
 153         return 1;
 154 }
 155
 156 static int manager_rtnl_listen(Manager *m) {
 157         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
 158         sd_netlink_message *i;
 159         int r;
 160
 161         assert(m);
 162
 163         /* First, subscribe to interfaces coming and going */
 164         r = sd_netlink_open(&m->rtnl);
 165         if (r < 0)
 166                 return r;
 167
 168         r = sd_netlink_attach_event(m->rtnl, m->event, 0);
 169         if (r < 0)
 170                 return r;
 171
 172         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, on_rtnl_event, NULL, m, "wait-online-on-NEWLINK");
 173         if (r < 0)
 174                 return r;
 175
 176         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, on_rtnl_event, NULL, m, "wait-online-on-DELLINK");
 177         if (r < 0)
 178                 return r;
 179
 180         /* Then, enumerate all links */
 181         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 182         if (r < 0)
 183                 return r;
 184
 185         r = sd_netlink_message_request_dump(req, true);
 186         if (r < 0)
 187                 return r;
 188
 189         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 190         if (r < 0)
 191                 return r;
 192
 193         for (i = reply; i; i = sd_netlink_message_next(i)) {
 194                 r = manager_process_link(m->rtnl, i, m);
 195                 if (r < 0)
 196                         return r;
 197         }
 198
 199         return r;
 200 }
 201
 202 static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 203         Manager *m = userdata;
 204         Iterator i;
 205         Link *l;
 206         int r;
 207
 208         assert(m);
 209
 210         sd_network_monitor_flush(m->network_monitor);
 211
 212         HASHMAP_FOREACH(l, m->links, i) {
 213                 r = link_update_monitor(l);
 214                 if (r < 0)
 215                         log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
 216         }
 217
 218         if (manager_all_configured(m))
 219                 sd_event_exit(m->event, 0);
 220
 221         return 0;
 222 }
 223
 224 static int manager_network_monitor_listen(Manager *m) {
 225         int r, fd, events;
 226
 227         assert(m);
 228
 229         r = sd_network_monitor_new(&m->network_monitor, NULL);
 230         if (r < 0)
 231                 return r;
 232
 233         fd = sd_network_monitor_get_fd(m->network_monitor);
 234         if (fd < 0)
 235                 return fd;
 236
 237         events = sd_network_monitor_get_events(m->network_monitor);
 238         if (events < 0)
 239                 return events;
 240
 241         r = sd_event_add_io(m->event, &m->network_monitor_event_source,
 242                             fd, events, &on_network_event, m);
 243         if (r < 0)
 244                 return r;
 245
 246         return 0;
 247 }
 248
 249 int manager_new(Manager **ret, char **interfaces, char **ignore, usec_t timeout) {
 250         _cleanup_(manager_freep) Manager *m = NULL;
 251         int r;
 252
 253         assert(ret);
 254
 255         m = new0(Manager, 1);
 256         if (!m)
 257                 return -ENOMEM;
 258
 259         m->interfaces = interfaces;
 260         m->ignore = ignore;
 261
 262         r = sd_event_default(&m->event);
 263         if (r < 0)
 264                 return r;
 265
 266         (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL,  NULL);
 267         (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
 268
 269         if (timeout > 0) {
 270                 usec_t usec;
 271
 272                 usec = now(clock_boottime_or_monotonic()) + timeout;
 273
 274                 r = sd_event_add_time(m->event, NULL, clock_boottime_or_monotonic(), usec, 0, NULL, INT_TO_PTR(-ETIMEDOUT));
 275                 if (r < 0)
 276                         return r;
 277         }
 278
 279         sd_event_set_watchdog(m->event, true);
 280
 281         r = manager_network_monitor_listen(m);
 282         if (r < 0)
 283                 return r;
 284
 285         r = manager_rtnl_listen(m);
 286         if (r < 0)
 287                 return r;
 288
 289         *ret = TAKE_PTR(m);
 290
 291         return 0;
 292 }
 293
 294 void manager_free(Manager *m) {
 295         if (!m)
 296                 return;
 297
 298         hashmap_free_with_destructor(m->links, link_free);
 299         hashmap_free(m->links_by_name);
 300
 301         sd_event_source_unref(m->network_monitor_event_source);
 302         sd_network_monitor_unref(m->network_monitor);
 303
 304         sd_event_source_unref(m->rtnl_event_source);
 305         sd_netlink_unref(m->rtnl);
 306
 307         sd_event_unref(m->event);
 308         free(m);
 309
 310         return;
 311 }