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_add(struct device *dev, struct device *member, struct blob_attr *vlan)
  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         return dev->hotplug_ops->add(dev, member, blobmsg_data(b.head));
  79 }
  80
  81 static int
  82 vlandev_hotplug_del(struct device *dev, struct device *member)
  83 {
  84         struct vlandev_device *mvdev = container_of(dev, struct vlandev_device, dev);
  85
  86         dev = mvdev->parent.dev;
  87         if (!dev || !dev->hotplug_ops)
  88                 return UBUS_STATUS_NOT_SUPPORTED;
  89
  90         return dev->hotplug_ops->del(dev, member);
  91 }
  92
  93 static int
  94 vlandev_hotplug_prepare(struct device *dev, struct device **bridge_dev)
  95 {
  96         struct vlandev_device *mvdev = container_of(dev, struct vlandev_device, dev);
  97
  98         dev = mvdev->parent.dev;
  99         if (!dev || !dev->hotplug_ops)
 100                 return UBUS_STATUS_NOT_SUPPORTED;
 101
 102         return dev->hotplug_ops->prepare(dev, bridge_dev);
 103 }
 104
 105 static void vlandev_hotplug_check(struct vlandev_device *mvdev)
 106 {
 107         static const struct device_hotplug_ops hotplug_ops = {
 108                 .prepare = vlandev_hotplug_prepare,
 109                 .add = vlandev_hotplug_add,
 110                 .del = vlandev_hotplug_del
 111         };
 112         struct device *dev = mvdev->parent.dev;
 113
 114         if (!dev || !dev->hotplug_ops || avl_is_empty(&dev->vlans.avl) ||
 115                 mvdev->dev.type != &vlan8021q_device_type) {
 116                 mvdev->dev.hotplug_ops = NULL;
 117                 return;
 118         }
 119
 120         mvdev->dev.hotplug_ops = &hotplug_ops;
 121 }
 122
 123
 124 static void
 125 vlandev_base_cb(struct device_user *dev, enum device_event ev)
 126 {
 127         struct vlandev_device *mvdev = container_of(dev, struct vlandev_device, parent);
 128
 129         switch (ev) {
 130         case DEV_EVENT_ADD:
 131                 device_set_present(&mvdev->dev, true);
 132                 break;
 133         case DEV_EVENT_REMOVE:
 134                 device_set_present(&mvdev->dev, false);
 135                 break;
 136         case DEV_EVENT_UPDATE_IFNAME:
 137                 vlandev_hotplug_check(mvdev);
 138                 break;
 139         default:
 140                 return;
 141         }
 142 }
 143
 144 static int
 145 vlandev_set_down(struct vlandev_device *mvdev)
 146 {
 147         mvdev->set_state(&mvdev->dev, false);
 148         system_vlandev_del(&mvdev->dev);
 149         device_release(&mvdev->parent);
 150
 151         return 0;
 152 }
 153
 154 static int
 155 vlandev_set_up(struct vlandev_device *mvdev)
 156 {
 157         int ret;
 158
 159         ret = device_claim(&mvdev->parent);
 160         if (ret < 0)
 161                 return ret;
 162
 163         ret = system_vlandev_add(&mvdev->dev, mvdev->parent.dev, &mvdev->config);
 164         if (ret < 0)
 165                 goto release;
 166
 167         ret = mvdev->set_state(&mvdev->dev, true);
 168         if (ret)
 169                 goto delete;
 170
 171         return 0;
 172
 173 delete:
 174         system_vlandev_del(&mvdev->dev);
 175 release:
 176         device_release(&mvdev->parent);
 177         return ret;
 178 }
 179
 180 static int
 181 vlandev_set_state(struct device *dev, bool up)
 182 {
 183         struct vlandev_device *mvdev;
 184
 185         D(SYSTEM, "vlandev_set_state(%s, %u)\n", dev->ifname, up);
 186
 187         mvdev = container_of(dev, struct vlandev_device, dev);
 188         if (up)
 189                 return vlandev_set_up(mvdev);
 190         else
 191                 return vlandev_set_down(mvdev);
 192 }
 193
 194 static void
 195 vlandev_free(struct device *dev)
 196 {
 197         struct vlandev_device *mvdev;
 198
 199         mvdev = container_of(dev, struct vlandev_device, dev);
 200         device_remove_user(&mvdev->parent);
 201         free(mvdev->config_data);
 202         vlist_simple_flush_all(&mvdev->config.ingress_qos_mapping_list);
 203         vlist_simple_flush_all(&mvdev->config.egress_qos_mapping_list);
 204         free(mvdev);
 205 }
 206
 207 static void vlandev_qos_mapping_dump(struct blob_buf *b, const char *name, const struct vlist_simple_tree *qos_mapping_li)
 208 {
 209         const struct vlan_qos_mapping *elem;
 210         void *a, *t;
 211
 212         a = blobmsg_open_array(b, name);
 213
 214         vlist_simple_for_each_element(qos_mapping_li, elem, node) {
 215                 t = blobmsg_open_table(b, NULL);
 216
 217                 blobmsg_add_u32(b, "from", elem->from);
 218                 blobmsg_add_u32(b, "to", elem->to);
 219
 220                 blobmsg_close_table(b, t);
 221         }
 222
 223         blobmsg_close_array(b, a);
 224 }
 225
 226 static void
 227 vlandev_dump_info(struct device *dev, struct blob_buf *b)
 228 {
 229         struct vlandev_device *mvdev;
 230
 231         mvdev = container_of(dev, struct vlandev_device, dev);
 232         blobmsg_add_string(b, "parent", mvdev->parent.dev->ifname);
 233         system_if_dump_info(dev, b);
 234         blobmsg_add_u32(b, "vid", mvdev->config.vid);
 235         vlandev_qos_mapping_dump(b, "ingress_qos_mapping", &mvdev->config.ingress_qos_mapping_list);
 236         vlandev_qos_mapping_dump(b, "egress_qos_mapping", &mvdev->config.egress_qos_mapping_list);
 237 }
 238
 239 static uint16_t
 240 vlandev_get_vid(struct device *dev, const char *id_str)
 241 {
 242         unsigned long id;
 243         uint16_t *alias_id;
 244         char *err;
 245
 246         id = strtoul(id_str, &err, 10);
 247         if (err && *err) {
 248                 if (!dev)
 249                         return 1;
 250
 251                 alias_id = kvlist_get(&dev->vlan_aliases, id_str);
 252                 if (!alias_id)
 253                         return 1;
 254
 255                 id = *alias_id;
 256         }
 257
 258         return (uint16_t)id;
 259 }
 260
 261 static void
 262 vlandev_config_init(struct device *dev)
 263 {
 264         struct vlandev_device *mvdev;
 265         struct device *basedev = NULL;
 266
 267         mvdev = container_of(dev, struct vlandev_device, dev);
 268         if (mvdev->ifname)
 269                 basedev = device_get(blobmsg_data(mvdev->ifname), true);
 270
 271         if (mvdev->vid)
 272                 mvdev->config.vid = vlandev_get_vid(basedev, blobmsg_get_string(mvdev->vid));
 273         else
 274                 mvdev->config.vid = 1;
 275
 276         device_add_user(&mvdev->parent, basedev);
 277         vlandev_hotplug_check(mvdev);
 278 }
 279
 280 static void vlandev_qos_mapping_list_apply(struct vlist_simple_tree *qos_mapping_li, struct blob_attr *list)
 281 {
 282         struct blob_attr *cur;
 283         struct vlan_qos_mapping *qos_mapping;
 284         int rem, rc;
 285
 286         blobmsg_for_each_attr(cur, list, rem) {
 287                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 288                         continue;
 289
 290                 if (!blobmsg_check_attr(cur, false))
 291                         continue;
 292
 293                 qos_mapping = calloc(1, sizeof(*qos_mapping));
 294                 if (!qos_mapping)
 295                         continue;
 296
 297                 rc = sscanf(blobmsg_data(cur), "%" PRIu32 ":%" PRIu32, &qos_mapping->from, &qos_mapping->to);
 298                 if (rc != 2) {
 299                         free(qos_mapping);
 300                         continue;
 301                 }
 302                 vlist_simple_add(qos_mapping_li, &qos_mapping->node);
 303         }
 304 }
 305
 306 static void
 307 vlandev_apply_settings(struct vlandev_device *mvdev, struct blob_attr **tb)
 308 {
 309         struct vlandev_config *cfg = &mvdev->config;
 310         struct blob_attr *cur;
 311
 312         cfg->proto = (mvdev->dev.type == &vlan8021q_device_type) ?
 313                 VLAN_PROTO_8021Q : VLAN_PROTO_8021AD;
 314
 315         vlist_simple_update(&cfg->ingress_qos_mapping_list);
 316         vlist_simple_update(&cfg->egress_qos_mapping_list);
 317
 318         if ((cur = tb[VLANDEV_ATTR_INGRESS_QOS_MAPPING]))
 319                 vlandev_qos_mapping_list_apply(&cfg->ingress_qos_mapping_list, cur);
 320
 321         if ((cur = tb[VLANDEV_ATTR_EGRESS_QOS_MAPPING]))
 322                 vlandev_qos_mapping_list_apply(&cfg->egress_qos_mapping_list, cur);
 323
 324         vlist_simple_flush(&cfg->ingress_qos_mapping_list);
 325         vlist_simple_flush(&cfg->egress_qos_mapping_list);
 326 }
 327
 328 static enum dev_change_type
 329 vlandev_reload(struct device *dev, struct blob_attr *attr)
 330 {
 331         struct blob_attr *tb_dev[__DEV_ATTR_MAX];
 332         struct blob_attr *tb_mv[__VLANDEV_ATTR_MAX];
 333         enum dev_change_type ret = DEV_CONFIG_APPLIED;
 334         struct vlandev_device *mvdev;
 335
 336         mvdev = container_of(dev, struct vlandev_device, dev);
 337         attr = blob_memdup(attr);
 338
 339         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, tb_dev,
 340                 blob_data(attr), blob_len(attr));
 341         blobmsg_parse(vlandev_attrs, __VLANDEV_ATTR_MAX, tb_mv,
 342                 blob_data(attr), blob_len(attr));
 343
 344         device_init_settings(dev, tb_dev);
 345         vlandev_apply_settings(mvdev, tb_mv);
 346         mvdev->ifname = tb_mv[VLANDEV_ATTR_IFNAME];
 347         mvdev->vid = tb_mv[VLANDEV_ATTR_VID];
 348
 349         if (mvdev->config_data) {
 350                 struct blob_attr *otb_dev[__DEV_ATTR_MAX];
 351                 struct blob_attr *otb_mv[__VLANDEV_ATTR_MAX];
 352
 353                 blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb_dev,
 354                         blob_data(mvdev->config_data), blob_len(mvdev->config_data));
 355
 356                 if (uci_blob_diff(tb_dev, otb_dev, &device_attr_list, NULL))
 357                     ret = DEV_CONFIG_RESTART;
 358
 359                 blobmsg_parse(vlandev_attrs, __VLANDEV_ATTR_MAX, otb_mv,
 360                         blob_data(mvdev->config_data), blob_len(mvdev->config_data));
 361
 362                 if (uci_blob_diff(tb_mv, otb_mv, &vlandev_attr_list, NULL))
 363                     ret = DEV_CONFIG_RESTART;
 364
 365                 vlandev_config_init(dev);
 366         }
 367
 368         free(mvdev->config_data);
 369         mvdev->config_data = attr;
 370         return ret;
 371 }
 372
 373 static struct device *
 374 vlandev_create(const char *name, struct device_type *devtype,
 375                struct blob_attr *attr)
 376 {
 377         struct vlandev_device *mvdev;
 378         struct device *dev = NULL;
 379
 380         mvdev = calloc(1, sizeof(*mvdev));
 381         if (!mvdev)
 382                 return NULL;
 383
 384         vlist_simple_init(&mvdev->config.ingress_qos_mapping_list,
 385                           struct vlan_qos_mapping, node);
 386         vlist_simple_init(&mvdev->config.egress_qos_mapping_list,
 387                           struct vlan_qos_mapping, node);
 388
 389         dev = &mvdev->dev;
 390
 391         if (device_init(dev, devtype, name) < 0) {
 392                 device_cleanup(dev);
 393                 free(mvdev);
 394                 return NULL;
 395         }
 396
 397         dev->config_pending = true;
 398
 399         mvdev->set_state = dev->set_state;
 400         dev->set_state = vlandev_set_state;
 401
 402         dev->hotplug_ops = NULL;
 403         mvdev->parent.cb = vlandev_base_cb;
 404
 405         vlandev_reload(dev, attr);
 406
 407         return dev;
 408 }
 409
 410 static struct device_type vlan8021ad_device_type = {
 411         .name = "8021ad",
 412         .config_params = &vlandev_attr_list,
 413         .create = vlandev_create,
 414         .config_init = vlandev_config_init,
 415         .reload = vlandev_reload,
 416         .free = vlandev_free,
 417         .dump_info = vlandev_dump_info,
 418 };
 419
 420 static struct device_type vlan8021q_device_type = {
 421         .name = "8021q",
 422         .config_params = &vlandev_attr_list,
 423         .create = vlandev_create,
 424         .config_init = vlandev_config_init,
 425         .reload = vlandev_reload,
 426         .free = vlandev_free,
 427         .dump_info = vlandev_dump_info,
 428 };
 429
 430 static void __init vlandev_device_type_init(void)
 431 {
 432         device_type_add(&vlan8021ad_device_type);
 433         device_type_add(&vlan8021q_device_type);
 434 }