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

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