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Linux/net/bridge/br_device.c

  1 /*
  2  *      Device handling code
  3  *      Linux ethernet bridge
  4  *
  5  *      Authors:
  6  *      Lennert Buytenhek               <buytenh@gnu.org>
  7  *
  8  *      This program is free software; you can redistribute it and/or
  9  *      modify it under the terms of the GNU General Public License
 10  *      as published by the Free Software Foundation; either version
 11  *      2 of the License, or (at your option) any later version.
 12  */
 13 
 14 #include <linux/kernel.h>
 15 #include <linux/netdevice.h>
 16 #include <linux/netpoll.h>
 17 #include <linux/etherdevice.h>
 18 #include <linux/ethtool.h>
 19 #include <linux/list.h>
 20 #include <linux/netfilter_bridge.h>
 21 
 22 #include <asm/uaccess.h>
 23 #include "br_private.h"
 24 
 25 #define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
 26                          NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
 27 
 28 const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
 29 EXPORT_SYMBOL_GPL(nf_br_ops);
 30 
 31 static struct lock_class_key bridge_netdev_addr_lock_key;
 32 
 33 /* net device transmit always called with BH disabled */
 34 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 35 {
 36         struct net_bridge *br = netdev_priv(dev);
 37         const unsigned char *dest = skb->data;
 38         struct net_bridge_fdb_entry *dst;
 39         struct net_bridge_mdb_entry *mdst;
 40         struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
 41         const struct nf_br_ops *nf_ops;
 42         u16 vid = 0;
 43 
 44         rcu_read_lock();
 45         nf_ops = rcu_dereference(nf_br_ops);
 46         if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
 47                 rcu_read_unlock();
 48                 return NETDEV_TX_OK;
 49         }
 50 
 51         u64_stats_update_begin(&brstats->syncp);
 52         brstats->tx_packets++;
 53         brstats->tx_bytes += skb->len;
 54         u64_stats_update_end(&brstats->syncp);
 55 
 56         BR_INPUT_SKB_CB(skb)->brdev = dev;
 57 
 58         skb_reset_mac_header(skb);
 59         skb_pull(skb, ETH_HLEN);
 60 
 61         if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
 62                 goto out;
 63 
 64         if (is_broadcast_ether_addr(dest)) {
 65                 br_flood(br, skb, false, false, true);
 66         } else if (is_multicast_ether_addr(dest)) {
 67                 if (unlikely(netpoll_tx_running(dev))) {
 68                         br_flood(br, skb, false, false, true);
 69                         goto out;
 70                 }
 71                 if (br_multicast_rcv(br, NULL, skb, vid)) {
 72                         kfree_skb(skb);
 73                         goto out;
 74                 }
 75 
 76                 mdst = br_mdb_get(br, skb, vid);
 77                 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
 78                     br_multicast_querier_exists(br, eth_hdr(skb)))
 79                         br_multicast_flood(mdst, skb, false, true);
 80                 else
 81                         br_flood(br, skb, false, false, true);
 82         } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL) {
 83                 br_forward(dst->dst, skb, false, true);
 84         } else {
 85                 br_flood(br, skb, true, false, true);
 86         }
 87 out:
 88         rcu_read_unlock();
 89         return NETDEV_TX_OK;
 90 }
 91 
 92 static void br_set_lockdep_class(struct net_device *dev)
 93 {
 94         lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
 95 }
 96 
 97 static int br_dev_init(struct net_device *dev)
 98 {
 99         struct net_bridge *br = netdev_priv(dev);
100         int err;
101 
102         br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
103         if (!br->stats)
104                 return -ENOMEM;
105 
106         err = br_vlan_init(br);
107         if (err) {
108                 free_percpu(br->stats);
109                 return err;
110         }
111 
112         err = br_multicast_init_stats(br);
113         if (err) {
114                 free_percpu(br->stats);
115                 br_vlan_flush(br);
116         }
117         br_set_lockdep_class(dev);
118 
119         return err;
120 }
121 
122 static int br_dev_open(struct net_device *dev)
123 {
124         struct net_bridge *br = netdev_priv(dev);
125 
126         netdev_update_features(dev);
127         netif_start_queue(dev);
128         br_stp_enable_bridge(br);
129         br_multicast_open(br);
130 
131         return 0;
132 }
133 
134 static void br_dev_set_multicast_list(struct net_device *dev)
135 {
136 }
137 
138 static void br_dev_change_rx_flags(struct net_device *dev, int change)
139 {
140         if (change & IFF_PROMISC)
141                 br_manage_promisc(netdev_priv(dev));
142 }
143 
144 static int br_dev_stop(struct net_device *dev)
145 {
146         struct net_bridge *br = netdev_priv(dev);
147 
148         br_stp_disable_bridge(br);
149         br_multicast_stop(br);
150 
151         netif_stop_queue(dev);
152 
153         return 0;
154 }
155 
156 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
157                                                 struct rtnl_link_stats64 *stats)
158 {
159         struct net_bridge *br = netdev_priv(dev);
160         struct pcpu_sw_netstats tmp, sum = { 0 };
161         unsigned int cpu;
162 
163         for_each_possible_cpu(cpu) {
164                 unsigned int start;
165                 const struct pcpu_sw_netstats *bstats
166                         = per_cpu_ptr(br->stats, cpu);
167                 do {
168                         start = u64_stats_fetch_begin_irq(&bstats->syncp);
169                         memcpy(&tmp, bstats, sizeof(tmp));
170                 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
171                 sum.tx_bytes   += tmp.tx_bytes;
172                 sum.tx_packets += tmp.tx_packets;
173                 sum.rx_bytes   += tmp.rx_bytes;
174                 sum.rx_packets += tmp.rx_packets;
175         }
176 
177         stats->tx_bytes   = sum.tx_bytes;
178         stats->tx_packets = sum.tx_packets;
179         stats->rx_bytes   = sum.rx_bytes;
180         stats->rx_packets = sum.rx_packets;
181 
182         return stats;
183 }
184 
185 static int br_change_mtu(struct net_device *dev, int new_mtu)
186 {
187         struct net_bridge *br = netdev_priv(dev);
188         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
189                 return -EINVAL;
190 
191         dev->mtu = new_mtu;
192 
193 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
194         /* remember the MTU in the rtable for PMTU */
195         dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
196 #endif
197 
198         return 0;
199 }
200 
201 /* Allow setting mac address to any valid ethernet address. */
202 static int br_set_mac_address(struct net_device *dev, void *p)
203 {
204         struct net_bridge *br = netdev_priv(dev);
205         struct sockaddr *addr = p;
206 
207         if (!is_valid_ether_addr(addr->sa_data))
208                 return -EADDRNOTAVAIL;
209 
210         spin_lock_bh(&br->lock);
211         if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
212                 /* Mac address will be changed in br_stp_change_bridge_id(). */
213                 br_stp_change_bridge_id(br, addr->sa_data);
214         }
215         spin_unlock_bh(&br->lock);
216 
217         return 0;
218 }
219 
220 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
221 {
222         strlcpy(info->driver, "bridge", sizeof(info->driver));
223         strlcpy(info->version, BR_VERSION, sizeof(info->version));
224         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
225         strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
226 }
227 
228 static netdev_features_t br_fix_features(struct net_device *dev,
229         netdev_features_t features)
230 {
231         struct net_bridge *br = netdev_priv(dev);
232 
233         return br_features_recompute(br, features);
234 }
235 
236 #ifdef CONFIG_NET_POLL_CONTROLLER
237 static void br_poll_controller(struct net_device *br_dev)
238 {
239 }
240 
241 static void br_netpoll_cleanup(struct net_device *dev)
242 {
243         struct net_bridge *br = netdev_priv(dev);
244         struct net_bridge_port *p;
245 
246         list_for_each_entry(p, &br->port_list, list)
247                 br_netpoll_disable(p);
248 }
249 
250 static int __br_netpoll_enable(struct net_bridge_port *p)
251 {
252         struct netpoll *np;
253         int err;
254 
255         np = kzalloc(sizeof(*p->np), GFP_KERNEL);
256         if (!np)
257                 return -ENOMEM;
258 
259         err = __netpoll_setup(np, p->dev);
260         if (err) {
261                 kfree(np);
262                 return err;
263         }
264 
265         p->np = np;
266         return err;
267 }
268 
269 int br_netpoll_enable(struct net_bridge_port *p)
270 {
271         if (!p->br->dev->npinfo)
272                 return 0;
273 
274         return __br_netpoll_enable(p);
275 }
276 
277 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
278 {
279         struct net_bridge *br = netdev_priv(dev);
280         struct net_bridge_port *p;
281         int err = 0;
282 
283         list_for_each_entry(p, &br->port_list, list) {
284                 if (!p->dev)
285                         continue;
286                 err = __br_netpoll_enable(p);
287                 if (err)
288                         goto fail;
289         }
290 
291 out:
292         return err;
293 
294 fail:
295         br_netpoll_cleanup(dev);
296         goto out;
297 }
298 
299 void br_netpoll_disable(struct net_bridge_port *p)
300 {
301         struct netpoll *np = p->np;
302 
303         if (!np)
304                 return;
305 
306         p->np = NULL;
307 
308         __netpoll_free_async(np);
309 }
310 
311 #endif
312 
313 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
314 
315 {
316         struct net_bridge *br = netdev_priv(dev);
317 
318         return br_add_if(br, slave_dev);
319 }
320 
321 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
322 {
323         struct net_bridge *br = netdev_priv(dev);
324 
325         return br_del_if(br, slave_dev);
326 }
327 
328 static const struct ethtool_ops br_ethtool_ops = {
329         .get_drvinfo    = br_getinfo,
330         .get_link       = ethtool_op_get_link,
331 };
332 
333 static const struct net_device_ops br_netdev_ops = {
334         .ndo_open                = br_dev_open,
335         .ndo_stop                = br_dev_stop,
336         .ndo_init                = br_dev_init,
337         .ndo_start_xmit          = br_dev_xmit,
338         .ndo_get_stats64         = br_get_stats64,
339         .ndo_set_mac_address     = br_set_mac_address,
340         .ndo_set_rx_mode         = br_dev_set_multicast_list,
341         .ndo_change_rx_flags     = br_dev_change_rx_flags,
342         .ndo_change_mtu          = br_change_mtu,
343         .ndo_do_ioctl            = br_dev_ioctl,
344 #ifdef CONFIG_NET_POLL_CONTROLLER
345         .ndo_netpoll_setup       = br_netpoll_setup,
346         .ndo_netpoll_cleanup     = br_netpoll_cleanup,
347         .ndo_poll_controller     = br_poll_controller,
348 #endif
349         .ndo_add_slave           = br_add_slave,
350         .ndo_del_slave           = br_del_slave,
351         .ndo_fix_features        = br_fix_features,
352         .ndo_neigh_construct     = netdev_default_l2upper_neigh_construct,
353         .ndo_neigh_destroy       = netdev_default_l2upper_neigh_destroy,
354         .ndo_fdb_add             = br_fdb_add,
355         .ndo_fdb_del             = br_fdb_delete,
356         .ndo_fdb_dump            = br_fdb_dump,
357         .ndo_bridge_getlink      = br_getlink,
358         .ndo_bridge_setlink      = br_setlink,
359         .ndo_bridge_dellink      = br_dellink,
360         .ndo_features_check      = passthru_features_check,
361 };
362 
363 static void br_dev_free(struct net_device *dev)
364 {
365         struct net_bridge *br = netdev_priv(dev);
366 
367         free_percpu(br->stats);
368         free_netdev(dev);
369 }
370 
371 static struct device_type br_type = {
372         .name   = "bridge",
373 };
374 
375 void br_dev_setup(struct net_device *dev)
376 {
377         struct net_bridge *br = netdev_priv(dev);
378 
379         eth_hw_addr_random(dev);
380         ether_setup(dev);
381 
382         dev->netdev_ops = &br_netdev_ops;
383         dev->destructor = br_dev_free;
384         dev->ethtool_ops = &br_ethtool_ops;
385         SET_NETDEV_DEVTYPE(dev, &br_type);
386         dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
387 
388         dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
389                         NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
390         dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
391                            NETIF_F_HW_VLAN_STAG_TX;
392         dev->vlan_features = COMMON_FEATURES;
393 
394         br->dev = dev;
395         spin_lock_init(&br->lock);
396         INIT_LIST_HEAD(&br->port_list);
397         spin_lock_init(&br->hash_lock);
398 
399         br->bridge_id.prio[0] = 0x80;
400         br->bridge_id.prio[1] = 0x00;
401 
402         ether_addr_copy(br->group_addr, eth_reserved_addr_base);
403 
404         br->stp_enabled = BR_NO_STP;
405         br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
406         br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
407 
408         br->designated_root = br->bridge_id;
409         br->bridge_max_age = br->max_age = 20 * HZ;
410         br->bridge_hello_time = br->hello_time = 2 * HZ;
411         br->bridge_forward_delay = br->forward_delay = 15 * HZ;
412         br->ageing_time = BR_DEFAULT_AGEING_TIME;
413 
414         br_netfilter_rtable_init(br);
415         br_stp_timer_init(br);
416         br_multicast_init(br);
417 }
418 

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