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

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