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Sources/netifd/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 
 21 #include "netifd.h"
 22 #include "device.h"
 23 #include "interface.h"
 24 #include "system.h"
 25 
 26 enum {
 27         MACVLAN_ATTR_IFNAME,
 28         MACVLAN_ATTR_MACADDR,
 29         MACVLAN_ATTR_MODE,
 30         __MACVLAN_ATTR_MAX
 31 };
 32 
 33 static const struct blobmsg_policy macvlan_attrs[__MACVLAN_ATTR_MAX] = {
 34         [MACVLAN_ATTR_IFNAME]  = { "ifname", BLOBMSG_TYPE_STRING },
 35         [MACVLAN_ATTR_MACADDR] = { "macaddr", BLOBMSG_TYPE_STRING },
 36         [MACVLAN_ATTR_MODE] = { "mode", BLOBMSG_TYPE_STRING },
 37 };
 38 
 39 static const struct uci_blob_param_list macvlan_attr_list = {
 40         .n_params = __MACVLAN_ATTR_MAX,
 41         .params = macvlan_attrs,
 42 
 43         .n_next = 1,
 44         .next = { &device_attr_list },
 45 };
 46 
 47 struct macvlan_device {
 48         struct device dev;
 49         struct device_user parent;
 50 
 51         device_state_cb set_state;
 52 
 53         struct blob_attr *config_data;
 54         struct blob_attr *ifname;
 55         struct macvlan_config config;
 56 };
 57 
 58 static void
 59 macvlan_base_cb(struct device_user *dev, enum device_event ev)
 60 {
 61         struct macvlan_device *mvdev = container_of(dev, struct macvlan_device, parent);
 62 
 63         switch (ev) {
 64         case DEV_EVENT_ADD:
 65                 device_set_present(&mvdev->dev, true);
 66                 break;
 67         case DEV_EVENT_REMOVE:
 68                 device_set_present(&mvdev->dev, false);
 69                 break;
 70         default:
 71                 return;
 72         }
 73 }
 74 
 75 static int
 76 macvlan_set_down(struct macvlan_device *mvdev)
 77 {
 78         mvdev->set_state(&mvdev->dev, false);
 79         system_macvlan_del(&mvdev->dev);
 80         device_release(&mvdev->parent);
 81 
 82         return 0;
 83 }
 84 
 85 static int
 86 macvlan_set_up(struct macvlan_device *mvdev)
 87 {
 88         int ret;
 89 
 90         ret = device_claim(&mvdev->parent);
 91         if (ret < 0)
 92                 return ret;
 93 
 94         ret = system_macvlan_add(&mvdev->dev, mvdev->parent.dev, &mvdev->config);
 95         if (ret < 0)
 96                 goto release;
 97 
 98         ret = mvdev->set_state(&mvdev->dev, true);
 99         if (ret)
100                 goto delete;
101 
102         return 0;
103 
104 delete:
105         system_macvlan_del(&mvdev->dev);
106 release:
107         device_release(&mvdev->parent);
108         return ret;
109 }
110 
111 static int
112 macvlan_set_state(struct device *dev, bool up)
113 {
114         struct macvlan_device *mvdev;
115 
116         D(SYSTEM, "macvlan_set_state(%s, %u)\n", dev->ifname, up);
117 
118         mvdev = container_of(dev, struct macvlan_device, dev);
119         if (up)
120                 return macvlan_set_up(mvdev);
121         else
122                 return macvlan_set_down(mvdev);
123 }
124 
125 static void
126 macvlan_free(struct device *dev)
127 {
128         struct macvlan_device *mvdev;
129 
130         mvdev = container_of(dev, struct macvlan_device, dev);
131         device_remove_user(&mvdev->parent);
132         free(mvdev->config_data);
133         free(mvdev);
134 }
135 
136 static void
137 macvlan_dump_info(struct device *dev, struct blob_buf *b)
138 {
139         struct macvlan_device *mvdev;
140 
141         mvdev = container_of(dev, struct macvlan_device, dev);
142         blobmsg_add_string(b, "parent", mvdev->parent.dev->ifname);
143         system_if_dump_info(dev, b);
144 }
145 
146 static void
147 macvlan_config_init(struct device *dev)
148 {
149         struct macvlan_device *mvdev;
150         struct device *basedev = NULL;
151 
152         mvdev = container_of(dev, struct macvlan_device, dev);
153         if (mvdev->ifname)
154                 basedev = device_get(blobmsg_data(mvdev->ifname), true);
155 
156         device_add_user(&mvdev->parent, basedev);
157 }
158 
159 static void
160 macvlan_apply_settings(struct macvlan_device *mvdev, struct blob_attr **tb)
161 {
162         struct macvlan_config *cfg = &mvdev->config;
163         struct blob_attr *cur;
164         struct ether_addr *ea;
165 
166         cfg->flags = 0;
167         cfg->mode = NULL;
168 
169         if ((cur = tb[MACVLAN_ATTR_MACADDR])) {
170                 ea = ether_aton(blobmsg_data(cur));
171                 if (ea) {
172                         memcpy(cfg->macaddr, ea, 6);
173                         cfg->flags |= MACVLAN_OPT_MACADDR;
174                 }
175         }
176 
177         if ((cur = tb[MACVLAN_ATTR_MODE]))
178                 cfg->mode = blobmsg_data(cur);
179 }
180 
181 static enum dev_change_type
182 macvlan_reload(struct device *dev, struct blob_attr *attr)
183 {
184         struct blob_attr *tb_dev[__DEV_ATTR_MAX];
185         struct blob_attr *tb_mv[__MACVLAN_ATTR_MAX];
186         enum dev_change_type ret = DEV_CONFIG_APPLIED;
187         struct macvlan_device *mvdev;
188 
189         mvdev = container_of(dev, struct macvlan_device, dev);
190         attr = blob_memdup(attr);
191 
192         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, tb_dev,
193                 blob_data(attr), blob_len(attr));
194         blobmsg_parse(macvlan_attrs, __MACVLAN_ATTR_MAX, tb_mv,
195                 blob_data(attr), blob_len(attr));
196 
197         device_init_settings(dev, tb_dev);
198         macvlan_apply_settings(mvdev, tb_mv);
199         mvdev->ifname = tb_mv[MACVLAN_ATTR_IFNAME];
200 
201         if (mvdev->config_data) {
202                 struct blob_attr *otb_dev[__DEV_ATTR_MAX];
203                 struct blob_attr *otb_mv[__MACVLAN_ATTR_MAX];
204 
205                 blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb_dev,
206                         blob_data(mvdev->config_data), blob_len(mvdev->config_data));
207 
208                 if (uci_blob_diff(tb_dev, otb_dev, &device_attr_list, NULL))
209                     ret = DEV_CONFIG_RESTART;
210 
211                 blobmsg_parse(macvlan_attrs, __MACVLAN_ATTR_MAX, otb_mv,
212                         blob_data(mvdev->config_data), blob_len(mvdev->config_data));
213 
214                 if (uci_blob_diff(tb_mv, otb_mv, &macvlan_attr_list, NULL))
215                     ret = DEV_CONFIG_RESTART;
216 
217                 macvlan_config_init(dev);
218         }
219 
220         free(mvdev->config_data);
221         mvdev->config_data = attr;
222         return ret;
223 }
224 
225 static struct device *
226 macvlan_create(const char *name, struct device_type *devtype,
227         struct blob_attr *attr)
228 {
229         struct macvlan_device *mvdev;
230         struct device *dev = NULL;
231 
232         mvdev = calloc(1, sizeof(*mvdev));
233         if (!mvdev)
234                 return NULL;
235 
236         dev = &mvdev->dev;
237         if (device_init(dev, devtype, name) < 0) {
238                 device_cleanup(dev);
239                 free(mvdev);
240                 return NULL;
241         }
242 
243         dev->config_pending = true;
244 
245         mvdev->set_state = dev->set_state;
246         dev->set_state = macvlan_set_state;
247 
248         dev->hotplug_ops = NULL;
249         mvdev->parent.cb = macvlan_base_cb;
250 
251         macvlan_reload(dev, attr);
252 
253         return dev;
254 }
255 
256 static struct device_type macvlan_device_type = {
257         .name = "macvlan",
258         .config_params = &macvlan_attr_list,
259         .create = macvlan_create,
260         .config_init = macvlan_config_init,
261         .reload = macvlan_reload,
262         .free = macvlan_free,
263         .dump_info = macvlan_dump_info,
264 };
265 
266 static void __init macvlan_device_type_init(void)
267 {
268         device_type_add(&macvlan_device_type);
269 }
270 

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