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                 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
  94                 return 0;
  95         }
  96
  97         r = sd_rtnl_message_link_get_ifindex(mm, &ifindex);
  98         if (r < 0) {
  99                 log_warning_errno(r, "rtnl: Could not get ifindex from link, ignoring: %m");
 100                 return 0;
 101         } else if (ifindex <= 0) {
 102                 log_warning("rtnl: received link message with invalid ifindex %d, ignoring", ifindex);
 103                 return 0;
 104         }
 105
 106         r = sd_netlink_message_read_string(mm, IFLA_IFNAME, &ifname);
 107         if (r < 0) {
 108                 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
 109                 return 0;
 110         }
 111
 112         l = hashmap_get(m->links, INT_TO_PTR(ifindex));
 113
 114         switch (type) {
 115
 116         case RTM_NEWLINK:
 117                 if (!l) {
 118                         log_debug("Found link %i", ifindex);
 119
 120                         r = link_new(m, &l, ifindex, ifname);
 121                         if (r < 0)
 122                                 return log_error_errno(r, "Failed to create link object: %m");
 123
 124                         r = link_update_monitor(l);
 125                         if (r < 0)
 126                                 return log_error_errno(r, "Failed to initialize link object: %m");
 127                 }
 128
 129                 r = link_update_rtnl(l, mm);
 130                 if (r < 0)
 131                         return log_warning_errno(r, "Failed to process RTNL link message: %m");;
 132
 133                 break;
 134
 135         case RTM_DELLINK:
 136                 if (l) {
 137                         log_debug("Removing link %i", l->ifindex);
 138                         link_free(l);
 139                 }
 140
 141                 break;
 142         }
 143
 144         return 0;
 145 }
 146
 147 static int on_rtnl_event(sd_netlink *rtnl, sd_netlink_message *mm, void *userdata) {
 148         Manager *m = userdata;
 149         int r;
 150
 151         r = manager_process_link(rtnl, mm, m);
 152         if (r < 0)
 153                 return r;
 154
 155         if (manager_all_configured(m))
 156                 sd_event_exit(m->event, 0);
 157
 158         return 1;
 159 }
 160
 161 static int manager_rtnl_listen(Manager *m) {
 162         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
 163         sd_netlink_message *i;
 164         int r;
 165
 166         assert(m);
 167
 168         /* First, subscribe to interfaces coming and going */
 169         r = sd_netlink_open(&m->rtnl);
 170         if (r < 0)
 171                 return r;
 172
 173         r = sd_netlink_attach_event(m->rtnl, m->event, 0);
 174         if (r < 0)
 175                 return r;
 176
 177         r = sd_netlink_add_match(m->rtnl, NULL, RTM_NEWLINK, on_rtnl_event, NULL, m, "wait-online-on-NEWLINK");
 178         if (r < 0)
 179                 return r;
 180
 181         r = sd_netlink_add_match(m->rtnl, NULL, RTM_DELLINK, on_rtnl_event, NULL, m, "wait-online-on-DELLINK");
 182         if (r < 0)
 183                 return r;
 184
 185         /* Then, enumerate all links */
 186         r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
 187         if (r < 0)
 188                 return r;
 189
 190         r = sd_netlink_message_request_dump(req, true);
 191         if (r < 0)
 192                 return r;
 193
 194         r = sd_netlink_call(m->rtnl, req, 0, &reply);
 195         if (r < 0)
 196                 return r;
 197
 198         for (i = reply; i; i = sd_netlink_message_next(i)) {
 199                 r = manager_process_link(m->rtnl, i, m);
 200                 if (r < 0)
 201                         return r;
 202         }
 203
 204         return r;
 205 }
 206
 207 static int on_network_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 208         Manager *m = userdata;
 209         Iterator i;
 210         Link *l;
 211         int r;
 212
 213         assert(m);
 214
 215         sd_network_monitor_flush(m->network_monitor);
 216
 217         HASHMAP_FOREACH(l, m->links, i) {
 218                 r = link_update_monitor(l);
 219                 if (r < 0)
 220                         log_warning_errno(r, "Failed to update monitor information for %i: %m", l->ifindex);
 221         }
 222
 223         if (manager_all_configured(m))
 224                 sd_event_exit(m->event, 0);
 225
 226         return 0;
 227 }
 228
 229 static int manager_network_monitor_listen(Manager *m) {
 230         int r, fd, events;
 231
 232         assert(m);
 233
 234         r = sd_network_monitor_new(&m->network_monitor, NULL);
 235         if (r < 0)
 236                 return r;
 237
 238         fd = sd_network_monitor_get_fd(m->network_monitor);
 239         if (fd < 0)
 240                 return fd;
 241
 242         events = sd_network_monitor_get_events(m->network_monitor);
 243         if (events < 0)
 244                 return events;
 245
 246         r = sd_event_add_io(m->event, &m->network_monitor_event_source,
 247                             fd, events, &on_network_event, m);
 248         if (r < 0)
 249                 return r;
 250
 251         return 0;
 252 }
 253
 254 int manager_new(Manager **ret, char **interfaces, char **ignore, usec_t timeout) {
 255         _cleanup_(manager_freep) Manager *m = NULL;
 256         int r;
 257
 258         assert(ret);
 259
 260         m = new0(Manager, 1);
 261         if (!m)
 262                 return -ENOMEM;
 263
 264         m->interfaces = interfaces;
 265         m->ignore = ignore;
 266
 267         r = sd_event_default(&m->event);
 268         if (r < 0)
 269                 return r;
 270
 271         (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL,  NULL);
 272         (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
 273
 274         if (timeout > 0) {
 275                 usec_t usec;
 276
 277                 usec = now(clock_boottime_or_monotonic()) + timeout;
 278
 279                 r = sd_event_add_time(m->event, NULL, clock_boottime_or_monotonic(), usec, 0, NULL, INT_TO_PTR(-ETIMEDOUT));
 280                 if (r < 0)
 281                         return r;
 282         }
 283
 284         sd_event_set_watchdog(m->event, true);
 285
 286         r = manager_network_monitor_listen(m);
 287         if (r < 0)
 288                 return r;
 289
 290         r = manager_rtnl_listen(m);
 291         if (r < 0)
 292                 return r;
 293
 294         *ret = TAKE_PTR(m);
 295
 296         return 0;
 297 }
 298
 299 void manager_free(Manager *m) {
 300         if (!m)
 301                 return;
 302
 303         hashmap_free_with_destructor(m->links, link_free);
 304         hashmap_free(m->links_by_name);
 305
 306         sd_event_source_unref(m->network_monitor_event_source);
 307         sd_network_monitor_unref(m->network_monitor);
 308
 309         sd_event_source_unref(m->rtnl_event_source);
 310         sd_netlink_unref(m->rtnl);
 311
 312         sd_event_unref(m->event);
 313         free(m);
 314
 315         return;
 316 }