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 <asm/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 /* net device transmit always called with BH disabled */
29 netdev_tx_t
br_dev_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
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
);
39 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
40 if (skb
->nf_bridge
&& (skb
->nf_bridge
->mask
& BRNF_BRIDGED_DNAT
)) {
41 br_nf_pre_routing_finish_bridge_slow(skb
);
47 u64_stats_update_begin(&brstats
->syncp
);
48 brstats
->tx_packets
++;
49 brstats
->tx_bytes
+= skb
->len
;
50 u64_stats_update_end(&brstats
->syncp
);
52 BR_INPUT_SKB_CB(skb
)->brdev
= dev
;
54 skb_reset_mac_header(skb
);
55 skb_pull(skb
, ETH_HLEN
);
57 if (!br_allowed_ingress(br
, br_get_vlan_info(br
), skb
, &vid
))
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);
67 if (br_multicast_rcv(br
, NULL
, skb
, vid
)) {
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
);
77 br_flood_deliver(br
, skb
, false);
78 } else if ((dst
= __br_fdb_get(br
, dest
, vid
)) != NULL
)
79 br_deliver(dst
->dst
, skb
);
81 br_flood_deliver(br
, skb
, true);
88 static int br_dev_init(struct net_device
*dev
)
90 struct net_bridge
*br
= netdev_priv(dev
);
93 br
->stats
= netdev_alloc_pcpu_stats(struct pcpu_sw_netstats
);
97 err
= br_vlan_init(br
);
99 free_percpu(br
->stats
);
104 static int br_dev_open(struct net_device
*dev
)
106 struct net_bridge
*br
= netdev_priv(dev
);
108 netdev_update_features(dev
);
109 netif_start_queue(dev
);
110 br_stp_enable_bridge(br
);
111 br_multicast_open(br
);
116 static void br_dev_set_multicast_list(struct net_device
*dev
)
120 static void br_dev_change_rx_flags(struct net_device
*dev
, int change
)
122 if (change
& IFF_PROMISC
)
123 br_manage_promisc(netdev_priv(dev
));
126 static int br_dev_stop(struct net_device
*dev
)
128 struct net_bridge
*br
= netdev_priv(dev
);
130 br_stp_disable_bridge(br
);
131 br_multicast_stop(br
);
133 netif_stop_queue(dev
);
138 static struct rtnl_link_stats64
*br_get_stats64(struct net_device
*dev
,
139 struct rtnl_link_stats64
*stats
)
141 struct net_bridge
*br
= netdev_priv(dev
);
142 struct pcpu_sw_netstats tmp
, sum
= { 0 };
145 for_each_possible_cpu(cpu
) {
147 const struct pcpu_sw_netstats
*bstats
148 = per_cpu_ptr(br
->stats
, cpu
);
150 start
= u64_stats_fetch_begin_irq(&bstats
->syncp
);
151 memcpy(&tmp
, bstats
, sizeof(tmp
));
152 } while (u64_stats_fetch_retry_irq(&bstats
->syncp
, start
));
153 sum
.tx_bytes
+= tmp
.tx_bytes
;
154 sum
.tx_packets
+= tmp
.tx_packets
;
155 sum
.rx_bytes
+= tmp
.rx_bytes
;
156 sum
.rx_packets
+= tmp
.rx_packets
;
159 stats
->tx_bytes
= sum
.tx_bytes
;
160 stats
->tx_packets
= sum
.tx_packets
;
161 stats
->rx_bytes
= sum
.rx_bytes
;
162 stats
->rx_packets
= sum
.rx_packets
;
167 static int br_change_mtu(struct net_device
*dev
, int new_mtu
)
169 struct net_bridge
*br
= netdev_priv(dev
);
170 if (new_mtu
< 68 || new_mtu
> br_min_mtu(br
))
175 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
176 /* remember the MTU in the rtable for PMTU */
177 dst_metric_set(&br
->fake_rtable
.dst
, RTAX_MTU
, new_mtu
);
183 /* Allow setting mac address to any valid ethernet address. */
184 static int br_set_mac_address(struct net_device
*dev
, void *p
)
186 struct net_bridge
*br
= netdev_priv(dev
);
187 struct sockaddr
*addr
= p
;
189 if (!is_valid_ether_addr(addr
->sa_data
))
190 return -EADDRNOTAVAIL
;
192 spin_lock_bh(&br
->lock
);
193 if (!ether_addr_equal(dev
->dev_addr
, addr
->sa_data
)) {
194 /* Mac address will be changed in br_stp_change_bridge_id(). */
195 br_stp_change_bridge_id(br
, addr
->sa_data
);
197 spin_unlock_bh(&br
->lock
);
202 static void br_getinfo(struct net_device
*dev
, struct ethtool_drvinfo
*info
)
204 strlcpy(info
->driver
, "bridge", sizeof(info
->driver
));
205 strlcpy(info
->version
, BR_VERSION
, sizeof(info
->version
));
206 strlcpy(info
->fw_version
, "N/A", sizeof(info
->fw_version
));
207 strlcpy(info
->bus_info
, "N/A", sizeof(info
->bus_info
));
210 static netdev_features_t
br_fix_features(struct net_device
*dev
,
211 netdev_features_t features
)
213 struct net_bridge
*br
= netdev_priv(dev
);
215 return br_features_recompute(br
, features
);
218 #ifdef CONFIG_NET_POLL_CONTROLLER
219 static void br_poll_controller(struct net_device
*br_dev
)
223 static void br_netpoll_cleanup(struct net_device
*dev
)
225 struct net_bridge
*br
= netdev_priv(dev
);
226 struct net_bridge_port
*p
;
228 list_for_each_entry(p
, &br
->port_list
, list
)
229 br_netpoll_disable(p
);
232 static int __br_netpoll_enable(struct net_bridge_port
*p
)
237 np
= kzalloc(sizeof(*p
->np
), GFP_KERNEL
);
241 err
= __netpoll_setup(np
, p
->dev
);
251 int br_netpoll_enable(struct net_bridge_port
*p
)
253 if (!p
->br
->dev
->npinfo
)
256 return __br_netpoll_enable(p
);
259 static int br_netpoll_setup(struct net_device
*dev
, struct netpoll_info
*ni
)
261 struct net_bridge
*br
= netdev_priv(dev
);
262 struct net_bridge_port
*p
;
265 list_for_each_entry(p
, &br
->port_list
, list
) {
268 err
= __br_netpoll_enable(p
);
277 br_netpoll_cleanup(dev
);
281 void br_netpoll_disable(struct net_bridge_port
*p
)
283 struct netpoll
*np
= p
->np
;
290 __netpoll_free_async(np
);
295 static int br_add_slave(struct net_device
*dev
, struct net_device
*slave_dev
)
298 struct net_bridge
*br
= netdev_priv(dev
);
300 return br_add_if(br
, slave_dev
);
303 static int br_del_slave(struct net_device
*dev
, struct net_device
*slave_dev
)
305 struct net_bridge
*br
= netdev_priv(dev
);
307 return br_del_if(br
, slave_dev
);
310 static const struct ethtool_ops br_ethtool_ops
= {
311 .get_drvinfo
= br_getinfo
,
312 .get_link
= ethtool_op_get_link
,
315 static const struct net_device_ops br_netdev_ops
= {
316 .ndo_open
= br_dev_open
,
317 .ndo_stop
= br_dev_stop
,
318 .ndo_init
= br_dev_init
,
319 .ndo_start_xmit
= br_dev_xmit
,
320 .ndo_get_stats64
= br_get_stats64
,
321 .ndo_set_mac_address
= br_set_mac_address
,
322 .ndo_set_rx_mode
= br_dev_set_multicast_list
,
323 .ndo_change_rx_flags
= br_dev_change_rx_flags
,
324 .ndo_change_mtu
= br_change_mtu
,
325 .ndo_do_ioctl
= br_dev_ioctl
,
326 #ifdef CONFIG_NET_POLL_CONTROLLER
327 .ndo_netpoll_setup
= br_netpoll_setup
,
328 .ndo_netpoll_cleanup
= br_netpoll_cleanup
,
329 .ndo_poll_controller
= br_poll_controller
,
331 .ndo_add_slave
= br_add_slave
,
332 .ndo_del_slave
= br_del_slave
,
333 .ndo_fix_features
= br_fix_features
,
334 .ndo_fdb_add
= br_fdb_add
,
335 .ndo_fdb_del
= br_fdb_delete
,
336 .ndo_fdb_dump
= br_fdb_dump
,
337 .ndo_bridge_getlink
= br_getlink
,
338 .ndo_bridge_setlink
= br_setlink
,
339 .ndo_bridge_dellink
= br_dellink
,
342 static void br_dev_free(struct net_device
*dev
)
344 struct net_bridge
*br
= netdev_priv(dev
);
346 free_percpu(br
->stats
);
350 static struct device_type br_type
= {
354 void br_dev_setup(struct net_device
*dev
)
356 struct net_bridge
*br
= netdev_priv(dev
);
358 eth_hw_addr_random(dev
);
361 dev
->netdev_ops
= &br_netdev_ops
;
362 dev
->destructor
= br_dev_free
;
363 dev
->ethtool_ops
= &br_ethtool_ops
;
364 SET_NETDEV_DEVTYPE(dev
, &br_type
);
365 dev
->tx_queue_len
= 0;
366 dev
->priv_flags
= IFF_EBRIDGE
;
368 dev
->features
= COMMON_FEATURES
| NETIF_F_LLTX
| NETIF_F_NETNS_LOCAL
|
369 NETIF_F_HW_VLAN_CTAG_TX
| NETIF_F_HW_VLAN_STAG_TX
;
370 dev
->hw_features
= COMMON_FEATURES
| NETIF_F_HW_VLAN_CTAG_TX
|
371 NETIF_F_HW_VLAN_STAG_TX
;
372 dev
->vlan_features
= COMMON_FEATURES
;
375 spin_lock_init(&br
->lock
);
376 INIT_LIST_HEAD(&br
->port_list
);
377 spin_lock_init(&br
->hash_lock
);
379 br
->bridge_id
.prio
[0] = 0x80;
380 br
->bridge_id
.prio
[1] = 0x00;
382 ether_addr_copy(br
->group_addr
, eth_reserved_addr_base
);
384 br
->stp_enabled
= BR_NO_STP
;
385 br
->group_fwd_mask
= BR_GROUPFWD_DEFAULT
;
386 br
->group_fwd_mask_required
= BR_GROUPFWD_DEFAULT
;
388 br
->designated_root
= br
->bridge_id
;
389 br
->bridge_max_age
= br
->max_age
= 20 * HZ
;
390 br
->bridge_hello_time
= br
->hello_time
= 2 * HZ
;
391 br
->bridge_forward_delay
= br
->forward_delay
= 15 * HZ
;
392 br
->ageing_time
= 300 * HZ
;
394 br_netfilter_rtable_init(br
);
395 br_stp_timer_init(br
);
396 br_multicast_init(br
);