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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 #ifdef 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 
 92         br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 93         if (!br->stats)
 94                 return -ENOMEM;
 95 
 96         return 0;
 97 }
 98 
 99 static int br_dev_open(struct net_device *dev)
100 {
101         struct net_bridge *br = netdev_priv(dev);
102 
103         netdev_update_features(dev);
104         netif_start_queue(dev);
105         br_stp_enable_bridge(br);
106         br_multicast_open(br);
107 
108         return 0;
109 }
110 
111 static void br_dev_set_multicast_list(struct net_device *dev)
112 {
113 }
114 
115 static int br_dev_stop(struct net_device *dev)
116 {
117         struct net_bridge *br = netdev_priv(dev);
118 
119         br_stp_disable_bridge(br);
120         br_multicast_stop(br);
121 
122         netif_stop_queue(dev);
123 
124         return 0;
125 }
126 
127 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
128                                                 struct rtnl_link_stats64 *stats)
129 {
130         struct net_bridge *br = netdev_priv(dev);
131         struct pcpu_sw_netstats tmp, sum = { 0 };
132         unsigned int cpu;
133 
134         for_each_possible_cpu(cpu) {
135                 unsigned int start;
136                 const struct pcpu_sw_netstats *bstats
137                         = per_cpu_ptr(br->stats, cpu);
138                 do {
139                         start = u64_stats_fetch_begin_irq(&bstats->syncp);
140                         memcpy(&tmp, bstats, sizeof(tmp));
141                 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
142                 sum.tx_bytes   += tmp.tx_bytes;
143                 sum.tx_packets += tmp.tx_packets;
144                 sum.rx_bytes   += tmp.rx_bytes;
145                 sum.rx_packets += tmp.rx_packets;
146         }
147 
148         stats->tx_bytes   = sum.tx_bytes;
149         stats->tx_packets = sum.tx_packets;
150         stats->rx_bytes   = sum.rx_bytes;
151         stats->rx_packets = sum.rx_packets;
152 
153         return stats;
154 }
155 
156 static int br_change_mtu(struct net_device *dev, int new_mtu)
157 {
158         struct net_bridge *br = netdev_priv(dev);
159         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
160                 return -EINVAL;
161 
162         dev->mtu = new_mtu;
163 
164 #ifdef CONFIG_BRIDGE_NETFILTER
165         /* remember the MTU in the rtable for PMTU */
166         dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
167 #endif
168 
169         return 0;
170 }
171 
172 /* Allow setting mac address to any valid ethernet address. */
173 static int br_set_mac_address(struct net_device *dev, void *p)
174 {
175         struct net_bridge *br = netdev_priv(dev);
176         struct sockaddr *addr = p;
177 
178         if (!is_valid_ether_addr(addr->sa_data))
179                 return -EADDRNOTAVAIL;
180 
181         spin_lock_bh(&br->lock);
182         if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
183                 /* Mac address will be changed in br_stp_change_bridge_id(). */
184                 br_stp_change_bridge_id(br, addr->sa_data);
185         }
186         spin_unlock_bh(&br->lock);
187 
188         return 0;
189 }
190 
191 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
192 {
193         strlcpy(info->driver, "bridge", sizeof(info->driver));
194         strlcpy(info->version, BR_VERSION, sizeof(info->version));
195         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
196         strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
197 }
198 
199 static netdev_features_t br_fix_features(struct net_device *dev,
200         netdev_features_t features)
201 {
202         struct net_bridge *br = netdev_priv(dev);
203 
204         return br_features_recompute(br, features);
205 }
206 
207 #ifdef CONFIG_NET_POLL_CONTROLLER
208 static void br_poll_controller(struct net_device *br_dev)
209 {
210 }
211 
212 static void br_netpoll_cleanup(struct net_device *dev)
213 {
214         struct net_bridge *br = netdev_priv(dev);
215         struct net_bridge_port *p;
216 
217         list_for_each_entry(p, &br->port_list, list)
218                 br_netpoll_disable(p);
219 }
220 
221 static int __br_netpoll_enable(struct net_bridge_port *p)
222 {
223         struct netpoll *np;
224         int err;
225 
226         np = kzalloc(sizeof(*p->np), GFP_KERNEL);
227         if (!np)
228                 return -ENOMEM;
229 
230         err = __netpoll_setup(np, p->dev);
231         if (err) {
232                 kfree(np);
233                 return err;
234         }
235 
236         p->np = np;
237         return err;
238 }
239 
240 int br_netpoll_enable(struct net_bridge_port *p)
241 {
242         if (!p->br->dev->npinfo)
243                 return 0;
244 
245         return __br_netpoll_enable(p);
246 }
247 
248 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
249 {
250         struct net_bridge *br = netdev_priv(dev);
251         struct net_bridge_port *p;
252         int err = 0;
253 
254         list_for_each_entry(p, &br->port_list, list) {
255                 if (!p->dev)
256                         continue;
257                 err = __br_netpoll_enable(p);
258                 if (err)
259                         goto fail;
260         }
261 
262 out:
263         return err;
264 
265 fail:
266         br_netpoll_cleanup(dev);
267         goto out;
268 }
269 
270 void br_netpoll_disable(struct net_bridge_port *p)
271 {
272         struct netpoll *np = p->np;
273 
274         if (!np)
275                 return;
276 
277         p->np = NULL;
278 
279         __netpoll_free_async(np);
280 }
281 
282 #endif
283 
284 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
285 
286 {
287         struct net_bridge *br = netdev_priv(dev);
288 
289         return br_add_if(br, slave_dev);
290 }
291 
292 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
293 {
294         struct net_bridge *br = netdev_priv(dev);
295 
296         return br_del_if(br, slave_dev);
297 }
298 
299 static const struct ethtool_ops br_ethtool_ops = {
300         .get_drvinfo    = br_getinfo,
301         .get_link       = ethtool_op_get_link,
302 };
303 
304 static const struct net_device_ops br_netdev_ops = {
305         .ndo_open                = br_dev_open,
306         .ndo_stop                = br_dev_stop,
307         .ndo_init                = br_dev_init,
308         .ndo_start_xmit          = br_dev_xmit,
309         .ndo_get_stats64         = br_get_stats64,
310         .ndo_set_mac_address     = br_set_mac_address,
311         .ndo_set_rx_mode         = br_dev_set_multicast_list,
312         .ndo_change_mtu          = br_change_mtu,
313         .ndo_do_ioctl            = br_dev_ioctl,
314 #ifdef CONFIG_NET_POLL_CONTROLLER
315         .ndo_netpoll_setup       = br_netpoll_setup,
316         .ndo_netpoll_cleanup     = br_netpoll_cleanup,
317         .ndo_poll_controller     = br_poll_controller,
318 #endif
319         .ndo_add_slave           = br_add_slave,
320         .ndo_del_slave           = br_del_slave,
321         .ndo_fix_features        = br_fix_features,
322         .ndo_fdb_add             = br_fdb_add,
323         .ndo_fdb_del             = br_fdb_delete,
324         .ndo_fdb_dump            = br_fdb_dump,
325         .ndo_bridge_getlink      = br_getlink,
326         .ndo_bridge_setlink      = br_setlink,
327         .ndo_bridge_dellink      = br_dellink,
328 };
329 
330 static void br_dev_free(struct net_device *dev)
331 {
332         struct net_bridge *br = netdev_priv(dev);
333 
334         free_percpu(br->stats);
335         free_netdev(dev);
336 }
337 
338 static struct device_type br_type = {
339         .name   = "bridge",
340 };
341 
342 void br_dev_setup(struct net_device *dev)
343 {
344         struct net_bridge *br = netdev_priv(dev);
345 
346         eth_hw_addr_random(dev);
347         ether_setup(dev);
348 
349         dev->netdev_ops = &br_netdev_ops;
350         dev->destructor = br_dev_free;
351         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
352         SET_NETDEV_DEVTYPE(dev, &br_type);
353         dev->tx_queue_len = 0;
354         dev->priv_flags = IFF_EBRIDGE;
355 
356         dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
357                         NETIF_F_HW_VLAN_CTAG_TX;
358         dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX;
359         dev->vlan_features = COMMON_FEATURES;
360 
361         br->dev = dev;
362         spin_lock_init(&br->lock);
363         INIT_LIST_HEAD(&br->port_list);
364         spin_lock_init(&br->hash_lock);
365 
366         br->bridge_id.prio[0] = 0x80;
367         br->bridge_id.prio[1] = 0x00;
368 
369         ether_addr_copy(br->group_addr, eth_reserved_addr_base);
370 
371         br->stp_enabled = BR_NO_STP;
372         br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
373 
374         br->designated_root = br->bridge_id;
375         br->bridge_max_age = br->max_age = 20 * HZ;
376         br->bridge_hello_time = br->hello_time = 2 * HZ;
377         br->bridge_forward_delay = br->forward_delay = 15 * HZ;
378         br->ageing_time = 300 * HZ;
379 
380         br_netfilter_rtable_init(br);
381         br_stp_timer_init(br);
382         br_multicast_init(br);
383 }
384 

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