macvlan.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15 #include <string.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <assert.h>
  19 #include <errno.h>
  20 #include <net/ethernet.h>
  21
  22 #ifdef linux
  23 #include <netinet/ether.h>
  24 #endif
  25
  26 #include "netifd.h"
  27 #include "device.h"
  28 #include "interface.h"
  29 #include "system.h"
  30
  31 enum {
  32         MACVLAN_ATTR_IFNAME,
  33         MACVLAN_ATTR_MACADDR,
  34         MACVLAN_ATTR_MODE,
  35         __MACVLAN_ATTR_MAX
  36 };
  37
  38 static const struct blobmsg_policy macvlan_attrs[__MACVLAN_ATTR_MAX] = {
  39         [MACVLAN_ATTR_IFNAME]  = { "ifname", BLOBMSG_TYPE_STRING },
  40         [MACVLAN_ATTR_MACADDR] = { "macaddr", BLOBMSG_TYPE_STRING },
  41         [MACVLAN_ATTR_MODE] = { "mode", BLOBMSG_TYPE_STRING },
  42 };
  43
  44 static const struct uci_blob_param_list macvlan_attr_list = {
  45         .n_params = __MACVLAN_ATTR_MAX,
  46         .params = macvlan_attrs,
  47
  48         .n_next = 1,
  49         .next = { &device_attr_list },
  50 };
  51
  52 struct macvlan_device {
  53         struct device dev;
  54         struct device_user parent;
  55
  56         device_state_cb set_state;
  57
  58         struct blob_attr *config_data;
  59         struct blob_attr *ifname;
  60         struct macvlan_config config;
  61 };
  62
  63 static void
  64 macvlan_base_cb(struct device_user *dev, enum device_event ev)
  65 {
  66         struct macvlan_device *mvdev = container_of(dev, struct macvlan_device, parent);
  67
  68         switch (ev) {
  69         case DEV_EVENT_ADD:
  70                 device_set_present(&mvdev->dev, true);
  71                 break;
  72         case DEV_EVENT_REMOVE:
  73                 device_set_present(&mvdev->dev, false);
  74                 break;
  75         case DEV_EVENT_LINK_UP:
  76                 device_set_link(&mvdev->dev, true);
  77                 break;
  78         case DEV_EVENT_LINK_DOWN:
  79                 device_set_link(&mvdev->dev, false);
  80                 break;
  81         default:
  82                 return;
  83         }
  84 }
  85
  86 static int
  87 macvlan_set_down(struct macvlan_device *mvdev)
  88 {
  89         mvdev->set_state(&mvdev->dev, false);
  90         system_macvlan_del(&mvdev->dev);
  91         device_release(&mvdev->parent);
  92
  93         return 0;
  94 }
  95
  96 static int
  97 macvlan_set_up(struct macvlan_device *mvdev)
  98 {
  99         int ret;
 100
 101         ret = device_claim(&mvdev->parent);
 102         if (ret < 0)
 103                 return ret;
 104
 105         ret = system_macvlan_add(&mvdev->dev, mvdev->parent.dev, &mvdev->config);
 106         if (ret < 0)
 107                 goto release;
 108
 109         ret = mvdev->set_state(&mvdev->dev, true);
 110         if (ret)
 111                 goto delete;
 112
 113         return 0;
 114
 115 delete:
 116         system_macvlan_del(&mvdev->dev);
 117 release:
 118         device_release(&mvdev->parent);
 119         return ret;
 120 }
 121
 122 static int
 123 macvlan_set_state(struct device *dev, bool up)
 124 {
 125         struct macvlan_device *mvdev;
 126
 127         D(SYSTEM, "macvlan_set_state(%s, %u)\n", dev->ifname, up);
 128
 129         mvdev = container_of(dev, struct macvlan_device, dev);
 130         if (up)
 131                 return macvlan_set_up(mvdev);
 132         else
 133                 return macvlan_set_down(mvdev);
 134 }
 135
 136 static void
 137 macvlan_free(struct device *dev)
 138 {
 139         struct macvlan_device *mvdev;
 140
 141         mvdev = container_of(dev, struct macvlan_device, dev);
 142         device_remove_user(&mvdev->parent);
 143         free(mvdev);
 144 }
 145
 146 static void
 147 macvlan_dump_info(struct device *dev, struct blob_buf *b)
 148 {
 149         struct macvlan_device *mvdev;
 150
 151         mvdev = container_of(dev, struct macvlan_device, dev);
 152         blobmsg_add_string(b, "parent", mvdev->parent.dev->ifname);
 153         system_if_dump_info(dev, b);
 154 }
 155
 156 static void
 157 macvlan_config_init(struct device *dev)
 158 {
 159         struct macvlan_device *mvdev;
 160         struct device *basedev = NULL;
 161
 162         mvdev = container_of(dev, struct macvlan_device, dev);
 163         if (mvdev->ifname)
 164                 basedev = device_get(blobmsg_data(mvdev->ifname), true);
 165
 166         device_add_user(&mvdev->parent, basedev);
 167 }
 168
 169 static void
 170 macvlan_apply_settings(struct macvlan_device *mvdev, struct blob_attr **tb)
 171 {
 172         struct macvlan_config *cfg = &mvdev->config;
 173         struct blob_attr *cur;
 174         struct ether_addr *ea;
 175
 176         cfg->flags = 0;
 177         cfg->mode = NULL;
 178
 179         if ((cur = tb[MACVLAN_ATTR_MACADDR])) {
 180                 ea = ether_aton(blobmsg_data(cur));
 181                 if (ea) {
 182                         memcpy(cfg->macaddr, ea, 6);
 183                         cfg->flags |= MACVLAN_OPT_MACADDR;
 184                 }
 185         }
 186
 187         if ((cur = tb[MACVLAN_ATTR_MODE]))
 188                 cfg->mode = blobmsg_data(cur);
 189 }
 190
 191 static enum dev_change_type
 192 macvlan_reload(struct device *dev, struct blob_attr *attr)
 193 {
 194         struct blob_attr *tb_dev[__DEV_ATTR_MAX];
 195         struct blob_attr *tb_mv[__MACVLAN_ATTR_MAX];
 196         enum dev_change_type ret = DEV_CONFIG_APPLIED;
 197         struct macvlan_device *mvdev;
 198
 199         mvdev = container_of(dev, struct macvlan_device, dev);
 200
 201         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, tb_dev,
 202                 blob_data(attr), blob_len(attr));
 203         blobmsg_parse(macvlan_attrs, __MACVLAN_ATTR_MAX, tb_mv,
 204                 blob_data(attr), blob_len(attr));
 205
 206         device_init_settings(dev, tb_dev);
 207         macvlan_apply_settings(mvdev, tb_mv);
 208         mvdev->ifname = tb_mv[MACVLAN_ATTR_IFNAME];
 209
 210         if (mvdev->config_data) {
 211                 struct blob_attr *otb_dev[__DEV_ATTR_MAX];
 212                 struct blob_attr *otb_mv[__MACVLAN_ATTR_MAX];
 213
 214                 blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb_dev,
 215                         blob_data(mvdev->config_data), blob_len(mvdev->config_data));
 216
 217                 if (uci_blob_diff(tb_dev, otb_dev, &device_attr_list, NULL))
 218                     ret = DEV_CONFIG_RESTART;
 219
 220                 blobmsg_parse(macvlan_attrs, __MACVLAN_ATTR_MAX, otb_mv,
 221                         blob_data(mvdev->config_data), blob_len(mvdev->config_data));
 222
 223                 if (uci_blob_diff(tb_mv, otb_mv, &macvlan_attr_list, NULL))
 224                     ret = DEV_CONFIG_RESTART;
 225
 226                 macvlan_config_init(dev);
 227         }
 228
 229         mvdev->config_data = attr;
 230         return ret;
 231 }
 232
 233 static struct device *
 234 macvlan_create(const char *name, struct blob_attr *attr)
 235 {
 236         struct macvlan_device *mvdev;
 237         struct device *dev = NULL;
 238
 239         mvdev = calloc(1, sizeof(*mvdev));
 240         if (!mvdev)
 241                 return NULL;
 242
 243         dev = &mvdev->dev;
 244         device_init(dev, &macvlan_device_type, name);
 245         dev->config_pending = true;
 246
 247         mvdev->set_state = dev->set_state;
 248         dev->set_state = macvlan_set_state;
 249
 250         dev->hotplug_ops = NULL;
 251         mvdev->parent.cb = macvlan_base_cb;
 252
 253         macvlan_reload(dev, attr);
 254
 255         return dev;
 256 }
 257
 258 const struct device_type macvlan_device_type = {
 259         .name = "MAC VLAN",
 260         .config_params = &macvlan_attr_list,
 261
 262         .create = macvlan_create,
 263         .config_init = macvlan_config_init,
 264         .reload = macvlan_reload,
 265         .free = macvlan_free,
 266         .dump_info = macvlan_dump_info,
 267 };