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_add_match_is_initialized(e);
 175         if (r < 0)
 176                 return r;
 177
 178         r = udev_enumerate_scan_devices(e);
 179         if (r < 0)
 180                 return r;
 181
 182         first = udev_enumerate_get_list_entry(e);
 183         udev_list_entry_foreach(item, first) {
 184                 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 185                 int k;
 186
 187                 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
 188                 if (!d)
 189                         return -ENOMEM;
 190
 191                 k = manager_process_link(m, d);
 192                 if (k < 0)
 193                         r = k;
 194         }
 195
 196         return r;
 197 }
 198
 199 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
 200         Manager *m = userdata;
 201         struct udev_monitor *monitor = m->udev_monitor;
 202         _cleanup_udev_device_unref_ struct udev_device *device = NULL;
 203
 204         device = udev_monitor_receive_device(monitor);
 205         if (!device)
 206                 return -ENOMEM;
 207
 208         manager_process_link(m, device);
 209         return 0;
 210 }
 211
 212 int manager_udev_listen(Manager *m) {
 213         int r;
 214
 215         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
 216         if (r < 0) {
 217                 log_error("Could not add udev monitor filter: %s", strerror(-r));
 218                 return r;
 219         }
 220
 221         r = udev_monitor_enable_receiving(m->udev_monitor);
 222         if (r < 0) {
 223                 log_error("Could not enable udev monitor");
 224                 return r;
 225         }
 226
 227         r = sd_event_add_io(m->event,
 228                         udev_monitor_get_fd(m->udev_monitor),
 229                         EPOLLIN, manager_dispatch_link_udev,
 230                         m, &m->udev_event_source);
 231         if (r < 0)
 232                 return r;
 233
 234         return 0;
 235 }
 236
 237 static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
 238         Manager *m = userdata;
 239         Link *link;
 240         int r, ifindex;
 241
 242         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 243         if (r < 0)
 244                 return 0;
 245
 246         link = hashmap_get(m->links, &ifindex);
 247         if (!link)
 248                 return 0;
 249
 250         r = link_update(link, message);
 251         if (r < 0)
 252                 return 0;
 253
 254         return 1;
 255 }
 256
 257 int manager_rtnl_listen(Manager *m) {
 258         int r;
 259
 260         r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
 261         if (r < 0)
 262                 return r;
 263
 264         r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
 265         if (r < 0)
 266                 return r;
 267
 268         return 0;
 269 }