vlandev.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2014 Gioacchino Mazzurco <gio@eigenlab.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <string.h>
  16 #include <inttypes.h>
  17
  18 #include "netifd.h"
  19 #include "device.h"
  20 #include "interface.h"
  21 #include "system.h"
  22 #include "utils.h"
  23
  24 enum {
  25         VLANDEV_ATTR_IFNAME,
  26         VLANDEV_ATTR_VID,
  27         VLANDEV_ATTR_INGRESS_QOS_MAPPING,
  28         VLANDEV_ATTR_EGRESS_QOS_MAPPING,
  29         __VLANDEV_ATTR_MAX
  30 };
  31
  32 static const struct blobmsg_policy vlandev_attrs[__VLANDEV_ATTR_MAX] = {
  33         [VLANDEV_ATTR_IFNAME] = { "ifname", BLOBMSG_TYPE_STRING },
  34         [VLANDEV_ATTR_VID] = { "vid", BLOBMSG_TYPE_STRING },
  35         [VLANDEV_ATTR_INGRESS_QOS_MAPPING] = { "ingress_qos_mapping", BLOBMSG_TYPE_ARRAY },
  36         [VLANDEV_ATTR_EGRESS_QOS_MAPPING] = { "egress_qos_mapping", BLOBMSG_TYPE_ARRAY },
  37 };
  38
  39 static const struct uci_blob_param_list vlandev_attr_list = {
  40         .n_params = __VLANDEV_ATTR_MAX,
  41         .params = vlandev_attrs,
  42
  43         .n_next = 1,
  44         .next = { &device_attr_list },
  45 };
  46
  47 static struct device_type vlan8021q_device_type;
  48 static struct blob_buf b;
  49
  50 struct vlandev_device {
  51         struct device dev;
  52         struct device_user parent;
  53
  54         device_state_cb set_state;
  55
  56         struct blob_attr *config_data;
  57         struct blob_attr *ifname;
  58         struct blob_attr *vid;
  59
  60         struct vlandev_config config;
  61 };
  62
  63 static int
  64 __vlandev_hotplug_op(struct device *dev, struct device *member, struct blob_attr *vlan, bool add)
  65 {
  66         struct vlandev_device *mvdev = container_of(dev, struct vlandev_device, dev);
  67         void *a;
  68
  69         dev = mvdev->parent.dev;
  70         if (!dev || !dev->hotplug_ops)
  71                 return UBUS_STATUS_NOT_SUPPORTED;
  72
  73         blob_buf_init(&b, 0);
  74         a = blobmsg_open_array(&b, "vlans");
  75         blobmsg_printf(&b, NULL, "%d", mvdev->config.vid);
  76         blobmsg_close_array(&b, a);
  77
  78         if (add)
  79                 return dev->hotplug_ops->add(dev, member, blobmsg_data(b.head));
  80         else
  81                 return dev->hotplug_ops->del(dev, member, blobmsg_data(b.head));
  82 }
  83
  84 static int
  85 vlandev_hotplug_add(struct device *dev, struct device *member, struct blob_attr *vlan)
  86 {
  87         return __vlandev_hotplug_op(dev, member, vlan, true);
  88 }
  89
  90 static int
  91 vlandev_hotplug_del(struct device *dev, struct device *member, struct blob_attr *vlan)
  92 {
  93         return __vlandev_hotplug_op(dev, member, vlan, false);
  94 }
  95
  96 static int
  97 vlandev_hotplug_prepare(struct device *dev, struct device **bridge_dev)
  98 {
  99         struct vlandev_device *mvdev = container_of(dev, struct vlandev_device, dev);
 100
 101         dev = mvdev->parent.dev;
 102         if (!dev || !dev->hotplug_ops)
 103                 return UBUS_STATUS_NOT_SUPPORTED;
 104
 105         return dev->hotplug_ops->prepare(dev, bridge_dev);
 106 }
 107
 108 static void vlandev_hotplug_check(struct vlandev_device *mvdev)
 109 {
 110         static const struct device_hotplug_ops hotplug_ops = {
 111                 .prepare = vlandev_hotplug_prepare,
 112                 .add = vlandev_hotplug_add,
 113                 .del = vlandev_hotplug_del
 114         };
 115         struct device *dev = mvdev->parent.dev;
 116
 117         if (!dev || !dev->hotplug_ops || avl_is_empty(&dev->vlans.avl) ||
 118                 mvdev->dev.type != &vlan8021q_device_type) {
 119                 mvdev->dev.hotplug_ops = NULL;
 120                 return;
 121         }
 122
 123         mvdev->dev.hotplug_ops = &hotplug_ops;
 124 }
 125
 126
 127 static void
 128 vlandev_base_cb(struct device_user *dev, enum device_event ev)
 129 {
 130         struct vlandev_device *mvdev = container_of(dev, struct vlandev_device, parent);
 131
 132         switch (ev) {
 133         case DEV_EVENT_ADD:
 134                 device_set_present(&mvdev->dev, true);
 135                 break;
 136         case DEV_EVENT_REMOVE:
 137                 device_set_present(&mvdev->dev, false);
 138                 break;
 139         case DEV_EVENT_UPDATE_IFNAME:
 140                 vlandev_hotplug_check(mvdev);
 141                 break;
 142         case DEV_EVENT_TOPO_CHANGE:
 143                 /* Propagate topo changes */
 144                 device_broadcast_event(&mvdev->dev, DEV_EVENT_TOPO_CHANGE);
 145                 break;
 146         default:
 147                 return;
 148         }
 149 }
 150
 151 static int
 152 vlandev_set_down(struct vlandev_device *mvdev)
 153 {
 154         mvdev->set_state(&mvdev->dev, false);
 155         system_vlandev_del(&mvdev->dev);
 156         device_release(&mvdev->parent);
 157
 158         return 0;
 159 }
 160
 161 static int
 162 vlandev_set_up(struct vlandev_device *mvdev)
 163 {
 164         int ret;
 165
 166         ret = device_claim(&mvdev->parent);
 167         if (ret < 0)
 168                 return ret;
 169
 170         ret = system_vlandev_add(&mvdev->dev, mvdev->parent.dev, &mvdev->config);
 171         if (ret < 0)
 172                 goto release;
 173
 174         ret = mvdev->set_state(&mvdev->dev, true);
 175         if (ret)
 176                 goto delete;
 177
 178         return 0;
 179
 180 delete:
 181         system_vlandev_del(&mvdev->dev);
 182 release:
 183         device_release(&mvdev->parent);
 184         return ret;
 185 }
 186
 187 static int
 188 vlandev_set_state(struct device *dev, bool up)
 189 {
 190         struct vlandev_device *mvdev;
 191
 192         D(SYSTEM, "vlandev_set_state(%s, %u)\n", dev->ifname, up);
 193
 194         mvdev = container_of(dev, struct vlandev_device, dev);
 195         if (up)
 196                 return vlandev_set_up(mvdev);
 197         else
 198                 return vlandev_set_down(mvdev);
 199 }
 200
 201 static void
 202 vlandev_free(struct device *dev)
 203 {
 204         struct vlandev_device *mvdev;
 205
 206         mvdev = container_of(dev, struct vlandev_device, dev);
 207         device_remove_user(&mvdev->parent);
 208         free(mvdev->config_data);
 209         vlist_simple_flush_all(&mvdev->config.ingress_qos_mapping_list);
 210         vlist_simple_flush_all(&mvdev->config.egress_qos_mapping_list);
 211         free(mvdev);
 212 }
 213
 214 static void vlandev_qos_mapping_dump(struct blob_buf *b, const char *name, const struct vlist_simple_tree *qos_mapping_li)
 215 {
 216         const struct vlan_qos_mapping *elem;
 217         void *a, *t;
 218
 219         a = blobmsg_open_array(b, name);
 220
 221         vlist_simple_for_each_element(qos_mapping_li, elem, node) {
 222                 t = blobmsg_open_table(b, NULL);
 223
 224                 blobmsg_add_u32(b, "from", elem->from);
 225                 blobmsg_add_u32(b, "to", elem->to);
 226
 227                 blobmsg_close_table(b, t);
 228         }
 229
 230         blobmsg_close_array(b, a);
 231 }
 232
 233 static void
 234 vlandev_dump_info(struct device *dev, struct blob_buf *b)
 235 {
 236         struct vlandev_device *mvdev;
 237
 238         mvdev = container_of(dev, struct vlandev_device, dev);
 239         blobmsg_add_string(b, "parent", mvdev->parent.dev->ifname);
 240         system_if_dump_info(dev, b);
 241         blobmsg_add_u32(b, "vid", mvdev->config.vid);
 242         vlandev_qos_mapping_dump(b, "ingress_qos_mapping", &mvdev->config.ingress_qos_mapping_list);
 243         vlandev_qos_mapping_dump(b, "egress_qos_mapping", &mvdev->config.egress_qos_mapping_list);
 244 }
 245
 246 static uint16_t
 247 vlandev_get_vid(struct device *dev, const char *id_str)
 248 {
 249         unsigned long id;
 250         uint16_t *alias_id;
 251         char *err;
 252
 253         id = strtoul(id_str, &err, 10);
 254         if (err && *err) {
 255                 if (!dev)
 256                         return 1;
 257
 258                 alias_id = kvlist_get(&dev->vlan_aliases, id_str);
 259                 if (!alias_id)
 260                         return 1;
 261
 262                 id = *alias_id;
 263         }
 264
 265         return (uint16_t)id;
 266 }
 267
 268 static void
 269 vlandev_config_init(struct device *dev)
 270 {
 271         struct vlandev_device *mvdev;
 272         struct device *basedev = NULL;
 273
 274         mvdev = container_of(dev, struct vlandev_device, dev);
 275         if (mvdev->ifname)
 276                 basedev = device_get(blobmsg_data(mvdev->ifname), true);
 277
 278         if (mvdev->vid)
 279                 mvdev->config.vid = vlandev_get_vid(basedev, blobmsg_get_string(mvdev->vid));
 280         else
 281                 mvdev->config.vid = 1;
 282
 283         device_add_user(&mvdev->parent, basedev);
 284         vlandev_hotplug_check(mvdev);
 285 }
 286
 287 static void vlandev_qos_mapping_list_apply(struct vlist_simple_tree *qos_mapping_li, struct blob_attr *list)
 288 {
 289         struct blob_attr *cur;
 290         struct vlan_qos_mapping *qos_mapping;
 291         int rem, rc;
 292
 293         blobmsg_for_each_attr(cur, list, rem) {
 294                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 295                         continue;
 296
 297                 if (!blobmsg_check_attr(cur, false))
 298                         continue;
 299
 300                 qos_mapping = calloc(1, sizeof(*qos_mapping));
 301                 if (!qos_mapping)
 302                         continue;
 303
 304                 rc = sscanf(blobmsg_data(cur), "%" PRIu32 ":%" PRIu32, &qos_mapping->from, &qos_mapping->to);
 305                 if (rc != 2) {
 306                         free(qos_mapping);
 307                         continue;
 308                 }
 309                 vlist_simple_add(qos_mapping_li, &qos_mapping->node);
 310         }
 311 }
 312
 313 static void
 314 vlandev_apply_settings(struct vlandev_device *mvdev, struct blob_attr **tb)
 315 {
 316         struct vlandev_config *cfg = &mvdev->config;
 317         struct blob_attr *cur;
 318
 319         cfg->proto = (mvdev->dev.type == &vlan8021q_device_type) ?
 320                 VLAN_PROTO_8021Q : VLAN_PROTO_8021AD;
 321
 322         vlist_simple_update(&cfg->ingress_qos_mapping_list);
 323         vlist_simple_update(&cfg->egress_qos_mapping_list);
 324
 325         if ((cur = tb[VLANDEV_ATTR_INGRESS_QOS_MAPPING]))
 326                 vlandev_qos_mapping_list_apply(&cfg->ingress_qos_mapping_list, cur);
 327
 328         if ((cur = tb[VLANDEV_ATTR_EGRESS_QOS_MAPPING]))
 329                 vlandev_qos_mapping_list_apply(&cfg->egress_qos_mapping_list, cur);
 330
 331         vlist_simple_flush(&cfg->ingress_qos_mapping_list);
 332         vlist_simple_flush(&cfg->egress_qos_mapping_list);
 333 }
 334
 335 static enum dev_change_type
 336 vlandev_reload(struct device *dev, struct blob_attr *attr)
 337 {
 338         struct blob_attr *tb_dev[__DEV_ATTR_MAX];
 339         struct blob_attr *tb_mv[__VLANDEV_ATTR_MAX];
 340         enum dev_change_type ret = DEV_CONFIG_APPLIED;
 341         struct vlandev_device *mvdev;
 342
 343         mvdev = container_of(dev, struct vlandev_device, dev);
 344         attr = blob_memdup(attr);
 345
 346         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, tb_dev,
 347                 blob_data(attr), blob_len(attr));
 348         blobmsg_parse(vlandev_attrs, __VLANDEV_ATTR_MAX, tb_mv,
 349                 blob_data(attr), blob_len(attr));
 350
 351         device_init_settings(dev, tb_dev);
 352         vlandev_apply_settings(mvdev, tb_mv);
 353         mvdev->ifname = tb_mv[VLANDEV_ATTR_IFNAME];
 354         mvdev->vid = tb_mv[VLANDEV_ATTR_VID];
 355
 356         if (mvdev->config_data) {
 357                 struct blob_attr *otb_dev[__DEV_ATTR_MAX];
 358                 struct blob_attr *otb_mv[__VLANDEV_ATTR_MAX];
 359
 360                 blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb_dev,
 361                         blob_data(mvdev->config_data), blob_len(mvdev->config_data));
 362
 363                 if (uci_blob_diff(tb_dev, otb_dev, &device_attr_list, NULL))
 364                     ret = DEV_CONFIG_RESTART;
 365
 366                 blobmsg_parse(vlandev_attrs, __VLANDEV_ATTR_MAX, otb_mv,
 367                         blob_data(mvdev->config_data), blob_len(mvdev->config_data));
 368
 369                 if (uci_blob_diff(tb_mv, otb_mv, &vlandev_attr_list, NULL))
 370                     ret = DEV_CONFIG_RESTART;
 371
 372                 vlandev_config_init(dev);
 373         }
 374
 375         free(mvdev->config_data);
 376         mvdev->config_data = attr;
 377         return ret;
 378 }
 379
 380 static struct device *
 381 vlandev_create(const char *name, struct device_type *devtype,
 382                struct blob_attr *attr)
 383 {
 384         struct vlandev_device *mvdev;
 385         struct device *dev = NULL;
 386
 387         mvdev = calloc(1, sizeof(*mvdev));
 388         if (!mvdev)
 389                 return NULL;
 390
 391         vlist_simple_init(&mvdev->config.ingress_qos_mapping_list,
 392                           struct vlan_qos_mapping, node);
 393         vlist_simple_init(&mvdev->config.egress_qos_mapping_list,
 394                           struct vlan_qos_mapping, node);
 395
 396         dev = &mvdev->dev;
 397
 398         if (device_init(dev, devtype, name) < 0) {
 399                 device_cleanup(dev);
 400                 free(mvdev);
 401                 return NULL;
 402         }
 403
 404         dev->config_pending = true;
 405
 406         mvdev->set_state = dev->set_state;
 407         dev->set_state = vlandev_set_state;
 408
 409         dev->hotplug_ops = NULL;
 410         mvdev->parent.cb = vlandev_base_cb;
 411
 412         vlandev_reload(dev, attr);
 413
 414         return dev;
 415 }
 416
 417 static struct device_type vlan8021ad_device_type = {
 418         .name = "8021ad",
 419         .config_params = &vlandev_attr_list,
 420         .create = vlandev_create,
 421         .config_init = vlandev_config_init,
 422         .reload = vlandev_reload,
 423         .free = vlandev_free,
 424         .dump_info = vlandev_dump_info,
 425 };
 426
 427 static struct device_type vlan8021q_device_type = {
 428         .name = "8021q",
 429         .config_params = &vlandev_attr_list,
 430         .create = vlandev_create,
 431         .config_init = vlandev_config_init,
 432         .reload = vlandev_reload,
 433         .free = vlandev_free,
 434         .dump_info = vlandev_dump_info,
 435 };
 436
 437 static void __init vlandev_device_type_init(void)
 438 {
 439         device_type_add(&vlan8021ad_device_type);
 440         device_type_add(&vlan8021q_device_type);
 441 }