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

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