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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_deliver(br, skb, false);
 66         else if (is_multicast_ether_addr(dest)) {
 67                 if (unlikely(netpoll_tx_running(dev))) {
 68                         br_flood_deliver(br, skb, false);
 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_deliver(mdst, skb);
 80                 else
 81                         br_flood_deliver(br, skb, false);
 82         } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL)
 83                 br_deliver(dst->dst, skb);
 84         else
 85                 br_flood_deliver(br, skb, 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         br_set_lockdep_class(dev);
110 
111         return err;
112 }
113 
114 static int br_dev_open(struct net_device *dev)
115 {
116         struct net_bridge *br = netdev_priv(dev);
117 
118         netdev_update_features(dev);
119         netif_start_queue(dev);
120         br_stp_enable_bridge(br);
121         br_multicast_open(br);
122 
123         return 0;
124 }
125 
126 static void br_dev_set_multicast_list(struct net_device *dev)
127 {
128 }
129 
130 static void br_dev_change_rx_flags(struct net_device *dev, int change)
131 {
132         if (change & IFF_PROMISC)
133                 br_manage_promisc(netdev_priv(dev));
134 }
135 
136 static int br_dev_stop(struct net_device *dev)
137 {
138         struct net_bridge *br = netdev_priv(dev);
139 
140         br_stp_disable_bridge(br);
141         br_multicast_stop(br);
142 
143         netif_stop_queue(dev);
144 
145         return 0;
146 }
147 
148 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
149                                                 struct rtnl_link_stats64 *stats)
150 {
151         struct net_bridge *br = netdev_priv(dev);
152         struct pcpu_sw_netstats tmp, sum = { 0 };
153         unsigned int cpu;
154 
155         for_each_possible_cpu(cpu) {
156                 unsigned int start;
157                 const struct pcpu_sw_netstats *bstats
158                         = per_cpu_ptr(br->stats, cpu);
159                 do {
160                         start = u64_stats_fetch_begin_irq(&bstats->syncp);
161                         memcpy(&tmp, bstats, sizeof(tmp));
162                 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
163                 sum.tx_bytes   += tmp.tx_bytes;
164                 sum.tx_packets += tmp.tx_packets;
165                 sum.rx_bytes   += tmp.rx_bytes;
166                 sum.rx_packets += tmp.rx_packets;
167         }
168 
169         stats->tx_bytes   = sum.tx_bytes;
170         stats->tx_packets = sum.tx_packets;
171         stats->rx_bytes   = sum.rx_bytes;
172         stats->rx_packets = sum.rx_packets;
173 
174         return stats;
175 }
176 
177 static int br_change_mtu(struct net_device *dev, int new_mtu)
178 {
179         struct net_bridge *br = netdev_priv(dev);
180         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
181                 return -EINVAL;
182 
183         dev->mtu = new_mtu;
184 
185 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
186         /* remember the MTU in the rtable for PMTU */
187         dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
188 #endif
189 
190         return 0;
191 }
192 
193 /* Allow setting mac address to any valid ethernet address. */
194 static int br_set_mac_address(struct net_device *dev, void *p)
195 {
196         struct net_bridge *br = netdev_priv(dev);
197         struct sockaddr *addr = p;
198 
199         if (!is_valid_ether_addr(addr->sa_data))
200                 return -EADDRNOTAVAIL;
201 
202         spin_lock_bh(&br->lock);
203         if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
204                 /* Mac address will be changed in br_stp_change_bridge_id(). */
205                 br_stp_change_bridge_id(br, addr->sa_data);
206         }
207         spin_unlock_bh(&br->lock);
208 
209         return 0;
210 }
211 
212 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
213 {
214         strlcpy(info->driver, "bridge", sizeof(info->driver));
215         strlcpy(info->version, BR_VERSION, sizeof(info->version));
216         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
217         strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
218 }
219 
220 static netdev_features_t br_fix_features(struct net_device *dev,
221         netdev_features_t features)
222 {
223         struct net_bridge *br = netdev_priv(dev);
224 
225         return br_features_recompute(br, features);
226 }
227 
228 #ifdef CONFIG_NET_POLL_CONTROLLER
229 static void br_poll_controller(struct net_device *br_dev)
230 {
231 }
232 
233 static void br_netpoll_cleanup(struct net_device *dev)
234 {
235         struct net_bridge *br = netdev_priv(dev);
236         struct net_bridge_port *p;
237 
238         list_for_each_entry(p, &br->port_list, list)
239                 br_netpoll_disable(p);
240 }
241 
242 static int __br_netpoll_enable(struct net_bridge_port *p)
243 {
244         struct netpoll *np;
245         int err;
246 
247         np = kzalloc(sizeof(*p->np), GFP_KERNEL);
248         if (!np)
249                 return -ENOMEM;
250 
251         err = __netpoll_setup(np, p->dev);
252         if (err) {
253                 kfree(np);
254                 return err;
255         }
256 
257         p->np = np;
258         return err;
259 }
260 
261 int br_netpoll_enable(struct net_bridge_port *p)
262 {
263         if (!p->br->dev->npinfo)
264                 return 0;
265 
266         return __br_netpoll_enable(p);
267 }
268 
269 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
270 {
271         struct net_bridge *br = netdev_priv(dev);
272         struct net_bridge_port *p;
273         int err = 0;
274 
275         list_for_each_entry(p, &br->port_list, list) {
276                 if (!p->dev)
277                         continue;
278                 err = __br_netpoll_enable(p);
279                 if (err)
280                         goto fail;
281         }
282 
283 out:
284         return err;
285 
286 fail:
287         br_netpoll_cleanup(dev);
288         goto out;
289 }
290 
291 void br_netpoll_disable(struct net_bridge_port *p)
292 {
293         struct netpoll *np = p->np;
294 
295         if (!np)
296                 return;
297 
298         p->np = NULL;
299 
300         __netpoll_free_async(np);
301 }
302 
303 #endif
304 
305 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
306 
307 {
308         struct net_bridge *br = netdev_priv(dev);
309 
310         return br_add_if(br, slave_dev);
311 }
312 
313 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
314 {
315         struct net_bridge *br = netdev_priv(dev);
316 
317         return br_del_if(br, slave_dev);
318 }
319 
320 static const struct ethtool_ops br_ethtool_ops = {
321         .get_drvinfo    = br_getinfo,
322         .get_link       = ethtool_op_get_link,
323 };
324 
325 static const struct net_device_ops br_netdev_ops = {
326         .ndo_open                = br_dev_open,
327         .ndo_stop                = br_dev_stop,
328         .ndo_init                = br_dev_init,
329         .ndo_start_xmit          = br_dev_xmit,
330         .ndo_get_stats64         = br_get_stats64,
331         .ndo_set_mac_address     = br_set_mac_address,
332         .ndo_set_rx_mode         = br_dev_set_multicast_list,
333         .ndo_change_rx_flags     = br_dev_change_rx_flags,
334         .ndo_change_mtu          = br_change_mtu,
335         .ndo_do_ioctl            = br_dev_ioctl,
336 #ifdef CONFIG_NET_POLL_CONTROLLER
337         .ndo_netpoll_setup       = br_netpoll_setup,
338         .ndo_netpoll_cleanup     = br_netpoll_cleanup,
339         .ndo_poll_controller     = br_poll_controller,
340 #endif
341         .ndo_add_slave           = br_add_slave,
342         .ndo_del_slave           = br_del_slave,
343         .ndo_fix_features        = br_fix_features,
344         .ndo_fdb_add             = br_fdb_add,
345         .ndo_fdb_del             = br_fdb_delete,
346         .ndo_fdb_dump            = br_fdb_dump,
347         .ndo_bridge_getlink      = br_getlink,
348         .ndo_bridge_setlink      = br_setlink,
349         .ndo_bridge_dellink      = br_dellink,
350         .ndo_features_check      = passthru_features_check,
351 };
352 
353 static void br_dev_free(struct net_device *dev)
354 {
355         struct net_bridge *br = netdev_priv(dev);
356 
357         free_percpu(br->stats);
358         free_netdev(dev);
359 }
360 
361 static struct device_type br_type = {
362         .name   = "bridge",
363 };
364 
365 void br_dev_setup(struct net_device *dev)
366 {
367         struct net_bridge *br = netdev_priv(dev);
368 
369         eth_hw_addr_random(dev);
370         ether_setup(dev);
371 
372         dev->netdev_ops = &br_netdev_ops;
373         dev->destructor = br_dev_free;
374         dev->ethtool_ops = &br_ethtool_ops;
375         SET_NETDEV_DEVTYPE(dev, &br_type);
376         dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
377 
378         dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
379                         NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
380         dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
381                            NETIF_F_HW_VLAN_STAG_TX;
382         dev->vlan_features = COMMON_FEATURES;
383 
384         br->dev = dev;
385         spin_lock_init(&br->lock);
386         INIT_LIST_HEAD(&br->port_list);
387         spin_lock_init(&br->hash_lock);
388 
389         br->bridge_id.prio[0] = 0x80;
390         br->bridge_id.prio[1] = 0x00;
391 
392         ether_addr_copy(br->group_addr, eth_reserved_addr_base);
393 
394         br->stp_enabled = BR_NO_STP;
395         br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
396         br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
397 
398         br->designated_root = br->bridge_id;
399         br->bridge_max_age = br->max_age = 20 * HZ;
400         br->bridge_hello_time = br->hello_time = 2 * HZ;
401         br->bridge_forward_delay = br->forward_delay = 15 * HZ;
402         br->ageing_time = BR_DEFAULT_AGEING_TIME;
403 
404         br_netfilter_rtable_init(br);
405         br_stp_timer_init(br);
406         br_multicast_init(br);
407 }
408 

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