src/network/networkd-manager.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 Tom Gundersen <teg@jklm.no>
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20  ***/
  21
  22 #include "path-util.h"
  23 #include "networkd.h"
  24 #include "libudev-private.h"
  25 #include "udev-util.h"
  26
  27 int manager_new(Manager **ret) {
  28         _cleanup_manager_free_ Manager *m = NULL;
  29         int r;
  30
  31         m = new0(Manager, 1);
  32         if (!m)
  33                 return -ENOMEM;
  34
  35         r = sd_event_default(&m->event);
  36         if (r < 0)
  37                 return r;
  38
  39         sd_event_set_watchdog(m->event, true);
  40
  41         r = sd_rtnl_open(RTMGRP_LINK | RTMGRP_IPV4_IFADDR, &m->rtnl);
  42         if (r < 0)
  43                 return r;
  44
  45         m->udev = udev_new();
  46         if (!m->udev)
  47                 return -ENOMEM;
  48
  49         m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
  50         if (!m->udev_monitor)
  51                 return -ENOMEM;
  52
  53         m->links = hashmap_new(uint64_hash_func, uint64_compare_func);
  54         if (!m->links)
  55                 return -ENOMEM;
  56
  57         m->bridges = hashmap_new(string_hash_func, string_compare_func);
  58         if (!m->bridges)
  59                 return -ENOMEM;
  60
  61         LIST_HEAD_INIT(m->networks);
  62
  63         m->network_dirs = strv_new("/etc/systemd/network/",
  64                         "/run/systemd/network/",
  65                         "/usr/lib/systemd/network",
  66 #ifdef HAVE_SPLIT_USER
  67                         "/lib/systemd/network",
  68 #endif
  69                         NULL);
  70         if (!m->network_dirs)
  71                 return -ENOMEM;
  72
  73         if (!path_strv_canonicalize_uniq(m->network_dirs))
  74                 return -ENOMEM;
  75
  76         *ret = m;
  77         m = NULL;
  78
  79         return 0;
  80 }
  81
  82 void manager_free(Manager *m) {
  83         Network *network;
  84         Bridge *bridge;
  85         Link *link;
  86
  87         udev_monitor_unref(m->udev_monitor);
  88         udev_unref(m->udev);
  89         sd_event_source_unref(m->udev_event_source);
  90         sd_event_unref(m->event);
  91
  92         while ((network = m->networks))
  93                 network_free(network);
  94
  95         while ((link = hashmap_first(m->links)))
  96                 link_free(link);
  97         hashmap_free(m->links);
  98
  99         while ((bridge = hashmap_first(m->bridges)))
 100                 bridge_free(bridge);
 101         hashmap_free(m->bridges);
 102
 103         strv_free(m->network_dirs);
 104         sd_rtnl_unref(m->rtnl);
 105
 106         free(m);
 107 }
 108
 109 int manager_load_config(Manager *m) {
 110         int r;
 111
 112         /* update timestamp */
 113         paths_check_timestamp(m->network_dirs, &m->network_dirs_ts_usec, true);
 114
 115         r = bridge_load(m);
 116         if (r < 0)
 117                 return r;
 118
 119         r = network_load(m);
 120         if (r < 0)
 121                 return r;
 122
 123         return 0;
 124 }
 125
 126 bool manager_should_reload(Manager *m) {
 127         return paths_check_timestamp(m->network_dirs, &m->network_dirs_ts_usec, false);
 128 }
 129
 130 static int manager_process_link(Manager *m, struct udev_device *device) {
 131         Link *link;
 132         int r;
 133
 134         if (streq_ptr(udev_device_get_action(device), "remove")) {
 135                 uint64_t ifindex;
 136
 137                 log_debug("Link removed: %s", udev_device_get_sysname(device));
 138
 139                 ifindex = udev_device_get_ifindex(device);
 140                 link = hashmap_get(m->links, &ifindex);
 141                 if (!link)
 142                         return 0;
 143
 144                 link_free(link);
 145         } else {
 146                 log_debug("New link: %s", udev_device_get_sysname(device));
 147
 148                 r = link_add(m, device);
 149                 if (r < 0) {
 150                         log_error("Could not handle link %s: %s",
 151                                         udev_device_get_sysname(device),
 152                                         strerror(-r));
 153                 }
 154         }
 155
 156         return 0;
 157 }
 158
 159 int manager_udev_enumerate_links(Manager *m) {
 160         _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
 161         struct udev_list_entry *item = NULL, *first = NULL;
 162         int r;
 163
 164         assert(m);
 165
 166         e = udev_enumerate_new(m->udev);
 167         if (!e)
 168                 return -ENOMEM;
 169
 170         r = udev_enumerate_add_match_subsystem(e, "net");
 171         if (r < 0)
 172                 return r;
 173
 174         r = udev_enumerate_scan_devices(e);
 175         if (r < 0)
 176                 return r;
 177
 178         first = udev_enumerate_get_list_entry(e);
 179         udev_list_entry_foreach(item, first) {
 180                 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 181                 int k;
 182
 183                 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
 184                 if (!d)
 185                         return -ENOMEM;
 186
 187                 if (!udev_device_get_is_initialized(d))
 188                         continue;
 189
 190                 k = manager_process_link(m, d);
 191                 if (k < 0)
 192                         r = k;
 193         }
 194
 195         return r;
 196 }
 197
 198 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
 199         Manager *m = userdata;
 200         struct udev_monitor *monitor = m->udev_monitor;
 201         _cleanup_udev_device_unref_ struct udev_device *device = NULL;
 202
 203         device = udev_monitor_receive_device(monitor);
 204         if (!device)
 205                 return -ENOMEM;
 206
 207         manager_process_link(m, device);
 208         return 0;
 209 }
 210
 211 int manager_udev_listen(Manager *m) {
 212         int r;
 213
 214         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
 215         if (r < 0) {
 216                 log_error("Could not add udev monitor filter: %s", strerror(-r));
 217                 return r;
 218         }
 219
 220         r = udev_monitor_enable_receiving(m->udev_monitor);
 221         if (r < 0) {
 222                 log_error("Could not enable udev monitor");
 223                 return r;
 224         }
 225
 226         r = sd_event_add_io(m->event,
 227                         udev_monitor_get_fd(m->udev_monitor),
 228                         EPOLLIN, manager_dispatch_link_udev,
 229                         m, &m->udev_event_source);
 230         if (r < 0)
 231                 return r;
 232
 233         return 0;
 234 }
 235
 236 static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
 237         Manager *m = userdata;
 238         Link *link;
 239         int r, ifindex;
 240
 241         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 242         if (r < 0)
 243                 return 0;
 244
 245         link = hashmap_get(m->links, &ifindex);
 246         if (!link)
 247                 return 0;
 248
 249         r = link_update(link, message);
 250         if (r < 0)
 251                 return 0;
 252
 253         return 1;
 254 }
 255
 256 int manager_rtnl_listen(Manager *m) {
 257         int r;
 258
 259         r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
 260         if (r < 0)
 261                 return r;
 262
 263         r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
 264         if (r < 0)
 265                 return r;
 266
 267         return 0;
 268 }