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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         int i;
 92 
 93         br->stats = alloc_percpu(struct pcpu_sw_netstats);
 94         if (!br->stats)
 95                 return -ENOMEM;
 96 
 97         for_each_possible_cpu(i) {
 98                 struct pcpu_sw_netstats *br_dev_stats;
 99                 br_dev_stats = per_cpu_ptr(br->stats, i);
100                 u64_stats_init(&br_dev_stats->syncp);
101         }
102 
103         return 0;
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 int br_dev_stop(struct net_device *dev)
123 {
124         struct net_bridge *br = netdev_priv(dev);
125 
126         br_stp_disable_bridge(br);
127         br_multicast_stop(br);
128 
129         netif_stop_queue(dev);
130 
131         return 0;
132 }
133 
134 static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
135                                                 struct rtnl_link_stats64 *stats)
136 {
137         struct net_bridge *br = netdev_priv(dev);
138         struct pcpu_sw_netstats tmp, sum = { 0 };
139         unsigned int cpu;
140 
141         for_each_possible_cpu(cpu) {
142                 unsigned int start;
143                 const struct pcpu_sw_netstats *bstats
144                         = per_cpu_ptr(br->stats, cpu);
145                 do {
146                         start = u64_stats_fetch_begin_bh(&bstats->syncp);
147                         memcpy(&tmp, bstats, sizeof(tmp));
148                 } while (u64_stats_fetch_retry_bh(&bstats->syncp, start));
149                 sum.tx_bytes   += tmp.tx_bytes;
150                 sum.tx_packets += tmp.tx_packets;
151                 sum.rx_bytes   += tmp.rx_bytes;
152                 sum.rx_packets += tmp.rx_packets;
153         }
154 
155         stats->tx_bytes   = sum.tx_bytes;
156         stats->tx_packets = sum.tx_packets;
157         stats->rx_bytes   = sum.rx_bytes;
158         stats->rx_packets = sum.rx_packets;
159 
160         return stats;
161 }
162 
163 static int br_change_mtu(struct net_device *dev, int new_mtu)
164 {
165         struct net_bridge *br = netdev_priv(dev);
166         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
167                 return -EINVAL;
168 
169         dev->mtu = new_mtu;
170 
171 #ifdef CONFIG_BRIDGE_NETFILTER
172         /* remember the MTU in the rtable for PMTU */
173         dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
174 #endif
175 
176         return 0;
177 }
178 
179 /* Allow setting mac address to any valid ethernet address. */
180 static int br_set_mac_address(struct net_device *dev, void *p)
181 {
182         struct net_bridge *br = netdev_priv(dev);
183         struct sockaddr *addr = p;
184 
185         if (!is_valid_ether_addr(addr->sa_data))
186                 return -EADDRNOTAVAIL;
187 
188         spin_lock_bh(&br->lock);
189         if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
190                 /* Mac address will be changed in br_stp_change_bridge_id(). */
191                 br_stp_change_bridge_id(br, addr->sa_data);
192         }
193         spin_unlock_bh(&br->lock);
194 
195         return 0;
196 }
197 
198 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
199 {
200         strlcpy(info->driver, "bridge", sizeof(info->driver));
201         strlcpy(info->version, BR_VERSION, sizeof(info->version));
202         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
203         strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
204 }
205 
206 static netdev_features_t br_fix_features(struct net_device *dev,
207         netdev_features_t features)
208 {
209         struct net_bridge *br = netdev_priv(dev);
210 
211         return br_features_recompute(br, features);
212 }
213 
214 #ifdef CONFIG_NET_POLL_CONTROLLER
215 static void br_poll_controller(struct net_device *br_dev)
216 {
217 }
218 
219 static void br_netpoll_cleanup(struct net_device *dev)
220 {
221         struct net_bridge *br = netdev_priv(dev);
222         struct net_bridge_port *p;
223 
224         list_for_each_entry(p, &br->port_list, list)
225                 br_netpoll_disable(p);
226 }
227 
228 static int __br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
229 {
230         struct netpoll *np;
231         int err;
232 
233         np = kzalloc(sizeof(*p->np), gfp);
234         if (!np)
235                 return -ENOMEM;
236 
237         err = __netpoll_setup(np, p->dev, gfp);
238         if (err) {
239                 kfree(np);
240                 return err;
241         }
242 
243         p->np = np;
244         return err;
245 }
246 
247 int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
248 {
249         if (!p->br->dev->npinfo)
250                 return 0;
251 
252         return __br_netpoll_enable(p, gfp);
253 }
254 
255 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni,
256                             gfp_t gfp)
257 {
258         struct net_bridge *br = netdev_priv(dev);
259         struct net_bridge_port *p;
260         int err = 0;
261 
262         list_for_each_entry(p, &br->port_list, list) {
263                 if (!p->dev)
264                         continue;
265                 err = __br_netpoll_enable(p, gfp);
266                 if (err)
267                         goto fail;
268         }
269 
270 out:
271         return err;
272 
273 fail:
274         br_netpoll_cleanup(dev);
275         goto out;
276 }
277 
278 void br_netpoll_disable(struct net_bridge_port *p)
279 {
280         struct netpoll *np = p->np;
281 
282         if (!np)
283                 return;
284 
285         p->np = NULL;
286 
287         __netpoll_free_async(np);
288 }
289 
290 #endif
291 
292 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
293 
294 {
295         struct net_bridge *br = netdev_priv(dev);
296 
297         return br_add_if(br, slave_dev);
298 }
299 
300 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
301 {
302         struct net_bridge *br = netdev_priv(dev);
303 
304         return br_del_if(br, slave_dev);
305 }
306 
307 static const struct ethtool_ops br_ethtool_ops = {
308         .get_drvinfo    = br_getinfo,
309         .get_link       = ethtool_op_get_link,
310 };
311 
312 static const struct net_device_ops br_netdev_ops = {
313         .ndo_open                = br_dev_open,
314         .ndo_stop                = br_dev_stop,
315         .ndo_init                = br_dev_init,
316         .ndo_start_xmit          = br_dev_xmit,
317         .ndo_get_stats64         = br_get_stats64,
318         .ndo_set_mac_address     = br_set_mac_address,
319         .ndo_set_rx_mode         = br_dev_set_multicast_list,
320         .ndo_change_mtu          = br_change_mtu,
321         .ndo_do_ioctl            = br_dev_ioctl,
322 #ifdef CONFIG_NET_POLL_CONTROLLER
323         .ndo_netpoll_setup       = br_netpoll_setup,
324         .ndo_netpoll_cleanup     = br_netpoll_cleanup,
325         .ndo_poll_controller     = br_poll_controller,
326 #endif
327         .ndo_add_slave           = br_add_slave,
328         .ndo_del_slave           = br_del_slave,
329         .ndo_fix_features        = br_fix_features,
330         .ndo_fdb_add             = br_fdb_add,
331         .ndo_fdb_del             = br_fdb_delete,
332         .ndo_fdb_dump            = br_fdb_dump,
333         .ndo_bridge_getlink      = br_getlink,
334         .ndo_bridge_setlink      = br_setlink,
335         .ndo_bridge_dellink      = br_dellink,
336 };
337 
338 static void br_dev_free(struct net_device *dev)
339 {
340         struct net_bridge *br = netdev_priv(dev);
341 
342         free_percpu(br->stats);
343         free_netdev(dev);
344 }
345 
346 static struct device_type br_type = {
347         .name   = "bridge",
348 };
349 
350 void br_dev_setup(struct net_device *dev)
351 {
352         struct net_bridge *br = netdev_priv(dev);
353 
354         eth_hw_addr_random(dev);
355         ether_setup(dev);
356 
357         dev->netdev_ops = &br_netdev_ops;
358         dev->destructor = br_dev_free;
359         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
360         SET_NETDEV_DEVTYPE(dev, &br_type);
361         dev->tx_queue_len = 0;
362         dev->priv_flags = IFF_EBRIDGE;
363 
364         dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
365                         NETIF_F_HW_VLAN_CTAG_TX;
366         dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_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         memcpy(br->group_addr, eth_reserved_addr_base, ETH_ALEN);
378 
379         br->stp_enabled = BR_NO_STP;
380         br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
381 
382         br->designated_root = br->bridge_id;
383         br->bridge_max_age = br->max_age = 20 * HZ;
384         br->bridge_hello_time = br->hello_time = 2 * HZ;
385         br->bridge_forward_delay = br->forward_delay = 15 * HZ;
386         br->ageing_time = 300 * HZ;
387 
388         br_netfilter_rtable_init(br);
389         br_stp_timer_init(br);
390         br_multicast_init(br);
391 }
392 

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