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Linux/net/bridge/br_device.c

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  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 /* net device transmit always called with BH disabled */
 26 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 27 {
 28         struct net_bridge *br = netdev_priv(dev);
 29         const unsigned char *dest = skb->data;
 30         struct net_bridge_fdb_entry *dst;
 31         struct net_bridge_mdb_entry *mdst;
 32         struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
 33 
 34 #ifdef CONFIG_BRIDGE_NETFILTER
 35         if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) {
 36                 br_nf_pre_routing_finish_bridge_slow(skb);
 37                 return NETDEV_TX_OK;
 38         }
 39 #endif
 40 
 41         u64_stats_update_begin(&brstats->syncp);
 42         brstats->tx_packets++;
 43         brstats->tx_bytes += skb->len;
 44         u64_stats_update_end(&brstats->syncp);
 45 
 46         BR_INPUT_SKB_CB(skb)->brdev = dev;
 47 
 48         skb_reset_mac_header(skb);
 49         skb_pull(skb, ETH_HLEN);
 50 
 51         rcu_read_lock();
 52         if (is_broadcast_ether_addr(dest))
 53                 br_flood_deliver(br, skb);
 54         else if (is_multicast_ether_addr(dest)) {
 55                 if (unlikely(netpoll_tx_running(dev))) {
 56                         br_flood_deliver(br, skb);
 57                         goto out;
 58                 }
 59                 if (br_multicast_rcv(br, NULL, skb)) {
 60                         kfree_skb(skb);
 61                         goto out;
 62                 }
 63 
 64                 mdst = br_mdb_get(br, skb);
 65                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
 66                         br_multicast_deliver(mdst, skb);
 67                 else
 68                         br_flood_deliver(br, skb);
 69         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
 70                 br_deliver(dst->dst, skb);
 71         else
 72                 br_flood_deliver(br, skb);
 73 
 74 out:
 75         rcu_read_unlock();
 76         return NETDEV_TX_OK;
 77 }
 78 
 79 static int br_dev_init(struct net_device *dev)
 80 {
 81         struct net_bridge *br = netdev_priv(dev);
 82 
 83         br->stats = alloc_percpu(struct br_cpu_netstats);
 84         if (!br->stats)
 85                 return -ENOMEM;
 86 
 87         return 0;
 88 }
 89 
 90 static int br_dev_open(struct net_device *dev)
 91 {
 92         struct net_bridge *br = netdev_priv(dev);
 93 
 94         netdev_update_features(dev);
 95         netif_start_queue(dev);
 96         br_stp_enable_bridge(br);
 97         br_multicast_open(br);
 98 
 99         return 0;
100 }
101 
102 static void br_dev_set_multicast_list(struct net_device *dev)
103 {
104 }
105 
106 static int br_dev_stop(struct net_device *dev)
107 {
108         struct net_bridge *br = netdev_priv(dev);
109 
110         br_stp_disable_bridge(br);
111         br_multicast_stop(br);
112 
113         netif_stop_queue(dev);
114 
115         return 0;
116 }
117 
118 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
119                                                 struct rtnl_link_stats64 *stats)
120 {
121         struct net_bridge *br = netdev_priv(dev);
122         struct br_cpu_netstats tmp, sum = { 0 };
123         unsigned int cpu;
124 
125         for_each_possible_cpu(cpu) {
126                 unsigned int start;
127                 const struct br_cpu_netstats *bstats
128                         = per_cpu_ptr(br->stats, cpu);
129                 do {
130                         start = u64_stats_fetch_begin(&bstats->syncp);
131                         memcpy(&tmp, bstats, sizeof(tmp));
132                 } while (u64_stats_fetch_retry(&bstats->syncp, start));
133                 sum.tx_bytes   += tmp.tx_bytes;
134                 sum.tx_packets += tmp.tx_packets;
135                 sum.rx_bytes   += tmp.rx_bytes;
136                 sum.rx_packets += tmp.rx_packets;
137         }
138 
139         stats->tx_bytes   = sum.tx_bytes;
140         stats->tx_packets = sum.tx_packets;
141         stats->rx_bytes   = sum.rx_bytes;
142         stats->rx_packets = sum.rx_packets;
143 
144         return stats;
145 }
146 
147 static int br_change_mtu(struct net_device *dev, int new_mtu)
148 {
149         struct net_bridge *br = netdev_priv(dev);
150         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
151                 return -EINVAL;
152 
153         dev->mtu = new_mtu;
154 
155 #ifdef CONFIG_BRIDGE_NETFILTER
156         /* remember the MTU in the rtable for PMTU */
157         dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
158 #endif
159 
160         return 0;
161 }
162 
163 /* Allow setting mac address to any valid ethernet address. */
164 static int br_set_mac_address(struct net_device *dev, void *p)
165 {
166         struct net_bridge *br = netdev_priv(dev);
167         struct sockaddr *addr = p;
168 
169         if (!is_valid_ether_addr(addr->sa_data))
170                 return -EINVAL;
171 
172         spin_lock_bh(&br->lock);
173         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
174         br_stp_change_bridge_id(br, addr->sa_data);
175         br->flags |= BR_SET_MAC_ADDR;
176         spin_unlock_bh(&br->lock);
177 
178         return 0;
179 }
180 
181 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
182 {
183         strcpy(info->driver, "bridge");
184         strcpy(info->version, BR_VERSION);
185         strcpy(info->fw_version, "N/A");
186         strcpy(info->bus_info, "N/A");
187 }
188 
189 static u32 br_fix_features(struct net_device *dev, u32 features)
190 {
191         struct net_bridge *br = netdev_priv(dev);
192 
193         return br_features_recompute(br, features);
194 }
195 
196 #ifdef CONFIG_NET_POLL_CONTROLLER
197 static void br_poll_controller(struct net_device *br_dev)
198 {
199 }
200 
201 static void br_netpoll_cleanup(struct net_device *dev)
202 {
203         struct net_bridge *br = netdev_priv(dev);
204         struct net_bridge_port *p, *n;
205 
206         list_for_each_entry_safe(p, n, &br->port_list, list) {
207                 br_netpoll_disable(p);
208         }
209 }
210 
211 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
212 {
213         struct net_bridge *br = netdev_priv(dev);
214         struct net_bridge_port *p, *n;
215         int err = 0;
216 
217         list_for_each_entry_safe(p, n, &br->port_list, list) {
218                 if (!p->dev)
219                         continue;
220 
221                 err = br_netpoll_enable(p);
222                 if (err)
223                         goto fail;
224         }
225 
226 out:
227         return err;
228 
229 fail:
230         br_netpoll_cleanup(dev);
231         goto out;
232 }
233 
234 int br_netpoll_enable(struct net_bridge_port *p)
235 {
236         struct netpoll *np;
237         int err = 0;
238 
239         np = kzalloc(sizeof(*p->np), GFP_KERNEL);
240         err = -ENOMEM;
241         if (!np)
242                 goto out;
243 
244         np->dev = p->dev;
245         strlcpy(np->dev_name, p->dev->name, IFNAMSIZ);
246 
247         err = __netpoll_setup(np);
248         if (err) {
249                 kfree(np);
250                 goto out;
251         }
252 
253         p->np = np;
254 
255 out:
256         return err;
257 }
258 
259 void br_netpoll_disable(struct net_bridge_port *p)
260 {
261         struct netpoll *np = p->np;
262 
263         if (!np)
264                 return;
265 
266         p->np = NULL;
267 
268         /* Wait for transmitting packets to finish before freeing. */
269         synchronize_rcu_bh();
270 
271         __netpoll_cleanup(np);
272         kfree(np);
273 }
274 
275 #endif
276 
277 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
278 
279 {
280         struct net_bridge *br = netdev_priv(dev);
281 
282         return br_add_if(br, slave_dev);
283 }
284 
285 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
286 {
287         struct net_bridge *br = netdev_priv(dev);
288 
289         return br_del_if(br, slave_dev);
290 }
291 
292 static const struct ethtool_ops br_ethtool_ops = {
293         .get_drvinfo    = br_getinfo,
294         .get_link       = ethtool_op_get_link,
295 };
296 
297 static const struct net_device_ops br_netdev_ops = {
298         .ndo_open                = br_dev_open,
299         .ndo_stop                = br_dev_stop,
300         .ndo_init                = br_dev_init,
301         .ndo_start_xmit          = br_dev_xmit,
302         .ndo_get_stats64         = br_get_stats64,
303         .ndo_set_mac_address     = br_set_mac_address,
304         .ndo_set_rx_mode         = br_dev_set_multicast_list,
305         .ndo_change_mtu          = br_change_mtu,
306         .ndo_do_ioctl            = br_dev_ioctl,
307 #ifdef CONFIG_NET_POLL_CONTROLLER
308         .ndo_netpoll_setup       = br_netpoll_setup,
309         .ndo_netpoll_cleanup     = br_netpoll_cleanup,
310         .ndo_poll_controller     = br_poll_controller,
311 #endif
312         .ndo_add_slave           = br_add_slave,
313         .ndo_del_slave           = br_del_slave,
314         .ndo_fix_features        = br_fix_features,
315 };
316 
317 static void br_dev_free(struct net_device *dev)
318 {
319         struct net_bridge *br = netdev_priv(dev);
320 
321         free_percpu(br->stats);
322         free_netdev(dev);
323 }
324 
325 static struct device_type br_type = {
326         .name   = "bridge",
327 };
328 
329 void br_dev_setup(struct net_device *dev)
330 {
331         struct net_bridge *br = netdev_priv(dev);
332 
333         random_ether_addr(dev->dev_addr);
334         ether_setup(dev);
335 
336         dev->netdev_ops = &br_netdev_ops;
337         dev->destructor = br_dev_free;
338         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
339         SET_NETDEV_DEVTYPE(dev, &br_type);
340         dev->tx_queue_len = 0;
341         dev->priv_flags = IFF_EBRIDGE;
342 
343         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
344                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
345                         NETIF_F_NETNS_LOCAL | NETIF_F_HW_VLAN_TX;
346         dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
347                            NETIF_F_GSO_MASK | NETIF_F_NO_CSUM |
348                            NETIF_F_HW_VLAN_TX;
349 
350         br->dev = dev;
351         spin_lock_init(&br->lock);
352         INIT_LIST_HEAD(&br->port_list);
353         spin_lock_init(&br->hash_lock);
354 
355         br->bridge_id.prio[0] = 0x80;
356         br->bridge_id.prio[1] = 0x00;
357 
358         memcpy(br->group_addr, br_group_address, ETH_ALEN);
359 
360         br->stp_enabled = BR_NO_STP;
361         br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
362 
363         br->designated_root = br->bridge_id;
364         br->bridge_max_age = br->max_age = 20 * HZ;
365         br->bridge_hello_time = br->hello_time = 2 * HZ;
366         br->bridge_forward_delay = br->forward_delay = 15 * HZ;
367         br->ageing_time = 300 * HZ;
368 
369         br_netfilter_rtable_init(br);
370         br_stp_timer_init(br);
371         br_multicast_init(br);
372 }
373 

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