3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
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.
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>
22 #include <linux/uaccess.h>
23 #include "br_private.h"
25 #define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
26 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
28 const struct nf_br_ops __rcu
*nf_br_ops __read_mostly
;
29 EXPORT_SYMBOL_GPL(nf_br_ops
);
31 static struct lock_class_key bridge_netdev_addr_lock_key
;
33 /* net device transmit always called with BH disabled */
34 netdev_tx_t
br_dev_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
36 struct net_bridge
*br
= netdev_priv(dev
);
37 struct net_bridge_fdb_entry
*dst
;
38 struct net_bridge_mdb_entry
*mdst
;
39 struct pcpu_sw_netstats
*brstats
= this_cpu_ptr(br
->stats
);
40 const struct nf_br_ops
*nf_ops
;
41 const unsigned char *dest
;
45 nf_ops
= rcu_dereference(nf_br_ops
);
46 if (nf_ops
&& nf_ops
->br_dev_xmit_hook(skb
)) {
51 u64_stats_update_begin(&brstats
->syncp
);
52 brstats
->tx_packets
++;
53 brstats
->tx_bytes
+= skb
->len
;
54 u64_stats_update_end(&brstats
->syncp
);
56 #ifdef CONFIG_NET_SWITCHDEV
57 skb
->offload_fwd_mark
= 0;
59 BR_INPUT_SKB_CB(skb
)->brdev
= dev
;
61 skb_reset_mac_header(skb
);
62 skb_pull(skb
, ETH_HLEN
);
64 if (!br_allowed_ingress(br
, br_vlan_group_rcu(br
), skb
, &vid
))
67 dest
= eth_hdr(skb
)->h_dest
;
68 if (is_broadcast_ether_addr(dest
)) {
69 br_flood(br
, skb
, BR_PKT_BROADCAST
, false, true);
70 } else if (is_multicast_ether_addr(dest
)) {
71 if (unlikely(netpoll_tx_running(dev
))) {
72 br_flood(br
, skb
, BR_PKT_MULTICAST
, false, true);
75 if (br_multicast_rcv(br
, NULL
, skb
, vid
)) {
80 mdst
= br_mdb_get(br
, skb
, vid
);
81 if ((mdst
|| BR_INPUT_SKB_CB_MROUTERS_ONLY(skb
)) &&
82 br_multicast_querier_exists(br
, eth_hdr(skb
)))
83 br_multicast_flood(mdst
, skb
, false, true);
85 br_flood(br
, skb
, BR_PKT_MULTICAST
, false, true);
86 } else if ((dst
= br_fdb_find_rcu(br
, dest
, vid
)) != NULL
) {
87 br_forward(dst
->dst
, skb
, false, true);
89 br_flood(br
, skb
, BR_PKT_UNICAST
, false, true);
96 static void br_set_lockdep_class(struct net_device
*dev
)
98 lockdep_set_class(&dev
->addr_list_lock
, &bridge_netdev_addr_lock_key
);
101 static int br_dev_init(struct net_device
*dev
)
103 struct net_bridge
*br
= netdev_priv(dev
);
106 br
->stats
= netdev_alloc_pcpu_stats(struct pcpu_sw_netstats
);
110 err
= br_vlan_init(br
);
112 free_percpu(br
->stats
);
116 err
= br_multicast_init_stats(br
);
118 free_percpu(br
->stats
);
121 br_set_lockdep_class(dev
);
126 static void br_dev_uninit(struct net_device
*dev
)
128 struct net_bridge
*br
= netdev_priv(dev
);
130 br_multicast_dev_del(br
);
131 br_multicast_uninit_stats(br
);
133 free_percpu(br
->stats
);
136 static int br_dev_open(struct net_device
*dev
)
138 struct net_bridge
*br
= netdev_priv(dev
);
140 netdev_update_features(dev
);
141 netif_start_queue(dev
);
142 br_stp_enable_bridge(br
);
143 br_multicast_open(br
);
148 static void br_dev_set_multicast_list(struct net_device
*dev
)
152 static void br_dev_change_rx_flags(struct net_device
*dev
, int change
)
154 if (change
& IFF_PROMISC
)
155 br_manage_promisc(netdev_priv(dev
));
158 static int br_dev_stop(struct net_device
*dev
)
160 struct net_bridge
*br
= netdev_priv(dev
);
162 br_stp_disable_bridge(br
);
163 br_multicast_stop(br
);
165 netif_stop_queue(dev
);
170 static void br_get_stats64(struct net_device
*dev
,
171 struct rtnl_link_stats64
*stats
)
173 struct net_bridge
*br
= netdev_priv(dev
);
174 struct pcpu_sw_netstats tmp
, sum
= { 0 };
177 for_each_possible_cpu(cpu
) {
179 const struct pcpu_sw_netstats
*bstats
180 = per_cpu_ptr(br
->stats
, cpu
);
182 start
= u64_stats_fetch_begin_irq(&bstats
->syncp
);
183 memcpy(&tmp
, bstats
, sizeof(tmp
));
184 } while (u64_stats_fetch_retry_irq(&bstats
->syncp
, start
));
185 sum
.tx_bytes
+= tmp
.tx_bytes
;
186 sum
.tx_packets
+= tmp
.tx_packets
;
187 sum
.rx_bytes
+= tmp
.rx_bytes
;
188 sum
.rx_packets
+= tmp
.rx_packets
;
191 stats
->tx_bytes
= sum
.tx_bytes
;
192 stats
->tx_packets
= sum
.tx_packets
;
193 stats
->rx_bytes
= sum
.rx_bytes
;
194 stats
->rx_packets
= sum
.rx_packets
;
197 static int br_change_mtu(struct net_device
*dev
, int new_mtu
)
199 struct net_bridge
*br
= netdev_priv(dev
);
200 if (new_mtu
> br_min_mtu(br
))
205 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
206 /* remember the MTU in the rtable for PMTU */
207 dst_metric_set(&br
->fake_rtable
.dst
, RTAX_MTU
, new_mtu
);
213 /* Allow setting mac address to any valid ethernet address. */
214 static int br_set_mac_address(struct net_device
*dev
, void *p
)
216 struct net_bridge
*br
= netdev_priv(dev
);
217 struct sockaddr
*addr
= p
;
219 if (!is_valid_ether_addr(addr
->sa_data
))
220 return -EADDRNOTAVAIL
;
222 spin_lock_bh(&br
->lock
);
223 if (!ether_addr_equal(dev
->dev_addr
, addr
->sa_data
)) {
224 /* Mac address will be changed in br_stp_change_bridge_id(). */
225 br_stp_change_bridge_id(br
, addr
->sa_data
);
227 spin_unlock_bh(&br
->lock
);
232 static void br_getinfo(struct net_device
*dev
, struct ethtool_drvinfo
*info
)
234 strlcpy(info
->driver
, "bridge", sizeof(info
->driver
));
235 strlcpy(info
->version
, BR_VERSION
, sizeof(info
->version
));
236 strlcpy(info
->fw_version
, "N/A", sizeof(info
->fw_version
));
237 strlcpy(info
->bus_info
, "N/A", sizeof(info
->bus_info
));
240 static netdev_features_t
br_fix_features(struct net_device
*dev
,
241 netdev_features_t features
)
243 struct net_bridge
*br
= netdev_priv(dev
);
245 return br_features_recompute(br
, features
);
248 #ifdef CONFIG_NET_POLL_CONTROLLER
249 static void br_poll_controller(struct net_device
*br_dev
)
253 static void br_netpoll_cleanup(struct net_device
*dev
)
255 struct net_bridge
*br
= netdev_priv(dev
);
256 struct net_bridge_port
*p
;
258 list_for_each_entry(p
, &br
->port_list
, list
)
259 br_netpoll_disable(p
);
262 static int __br_netpoll_enable(struct net_bridge_port
*p
)
267 np
= kzalloc(sizeof(*p
->np
), GFP_KERNEL
);
271 err
= __netpoll_setup(np
, p
->dev
);
281 int br_netpoll_enable(struct net_bridge_port
*p
)
283 if (!p
->br
->dev
->npinfo
)
286 return __br_netpoll_enable(p
);
289 static int br_netpoll_setup(struct net_device
*dev
, struct netpoll_info
*ni
)
291 struct net_bridge
*br
= netdev_priv(dev
);
292 struct net_bridge_port
*p
;
295 list_for_each_entry(p
, &br
->port_list
, list
) {
298 err
= __br_netpoll_enable(p
);
307 br_netpoll_cleanup(dev
);
311 void br_netpoll_disable(struct net_bridge_port
*p
)
313 struct netpoll
*np
= p
->np
;
320 __netpoll_free_async(np
);
325 static int br_add_slave(struct net_device
*dev
, struct net_device
*slave_dev
)
328 struct net_bridge
*br
= netdev_priv(dev
);
330 return br_add_if(br
, slave_dev
);
333 static int br_del_slave(struct net_device
*dev
, struct net_device
*slave_dev
)
335 struct net_bridge
*br
= netdev_priv(dev
);
337 return br_del_if(br
, slave_dev
);
340 static const struct ethtool_ops br_ethtool_ops
= {
341 .get_drvinfo
= br_getinfo
,
342 .get_link
= ethtool_op_get_link
,
345 static const struct net_device_ops br_netdev_ops
= {
346 .ndo_open
= br_dev_open
,
347 .ndo_stop
= br_dev_stop
,
348 .ndo_init
= br_dev_init
,
349 .ndo_uninit
= br_dev_uninit
,
350 .ndo_start_xmit
= br_dev_xmit
,
351 .ndo_get_stats64
= br_get_stats64
,
352 .ndo_set_mac_address
= br_set_mac_address
,
353 .ndo_set_rx_mode
= br_dev_set_multicast_list
,
354 .ndo_change_rx_flags
= br_dev_change_rx_flags
,
355 .ndo_change_mtu
= br_change_mtu
,
356 .ndo_do_ioctl
= br_dev_ioctl
,
357 #ifdef CONFIG_NET_POLL_CONTROLLER
358 .ndo_netpoll_setup
= br_netpoll_setup
,
359 .ndo_netpoll_cleanup
= br_netpoll_cleanup
,
360 .ndo_poll_controller
= br_poll_controller
,
362 .ndo_add_slave
= br_add_slave
,
363 .ndo_del_slave
= br_del_slave
,
364 .ndo_fix_features
= br_fix_features
,
365 .ndo_fdb_add
= br_fdb_add
,
366 .ndo_fdb_del
= br_fdb_delete
,
367 .ndo_fdb_dump
= br_fdb_dump
,
368 .ndo_bridge_getlink
= br_getlink
,
369 .ndo_bridge_setlink
= br_setlink
,
370 .ndo_bridge_dellink
= br_dellink
,
371 .ndo_features_check
= passthru_features_check
,
374 static struct device_type br_type
= {
378 void br_dev_setup(struct net_device
*dev
)
380 struct net_bridge
*br
= netdev_priv(dev
);
382 eth_hw_addr_random(dev
);
385 dev
->netdev_ops
= &br_netdev_ops
;
386 dev
->needs_free_netdev
= true;
387 dev
->ethtool_ops
= &br_ethtool_ops
;
388 SET_NETDEV_DEVTYPE(dev
, &br_type
);
389 dev
->priv_flags
= IFF_EBRIDGE
| IFF_NO_QUEUE
;
391 dev
->features
= COMMON_FEATURES
| NETIF_F_LLTX
| NETIF_F_NETNS_LOCAL
|
392 NETIF_F_HW_VLAN_CTAG_TX
| NETIF_F_HW_VLAN_STAG_TX
;
393 dev
->hw_features
= COMMON_FEATURES
| NETIF_F_HW_VLAN_CTAG_TX
|
394 NETIF_F_HW_VLAN_STAG_TX
;
395 dev
->vlan_features
= COMMON_FEATURES
;
398 spin_lock_init(&br
->lock
);
399 INIT_LIST_HEAD(&br
->port_list
);
400 spin_lock_init(&br
->hash_lock
);
402 br
->bridge_id
.prio
[0] = 0x80;
403 br
->bridge_id
.prio
[1] = 0x00;
405 ether_addr_copy(br
->group_addr
, eth_reserved_addr_base
);
407 br
->stp_enabled
= BR_NO_STP
;
408 br
->group_fwd_mask
= BR_GROUPFWD_DEFAULT
;
409 br
->group_fwd_mask_required
= BR_GROUPFWD_DEFAULT
;
411 br
->designated_root
= br
->bridge_id
;
412 br
->bridge_max_age
= br
->max_age
= 20 * HZ
;
413 br
->bridge_hello_time
= br
->hello_time
= 2 * HZ
;
414 br
->bridge_forward_delay
= br
->forward_delay
= 15 * HZ
;
415 br
->bridge_ageing_time
= br
->ageing_time
= BR_DEFAULT_AGEING_TIME
;
416 dev
->max_mtu
= ETH_MAX_MTU
;
418 br_netfilter_rtable_init(br
);
419 br_stp_timer_init(br
);
420 br_multicast_init(br
);
421 INIT_DELAYED_WORK(&br
->gc_work
, br_fdb_cleanup
);