Linux Audio

Check our new training course

Loading...
v4.6
 
  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
 28const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
 29EXPORT_SYMBOL_GPL(nf_br_ops);
 30
 31static struct lock_class_key bridge_netdev_addr_lock_key;
 32
 33/* net device transmit always called with BH disabled */
 34netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 35{
 36	struct net_bridge *br = netdev_priv(dev);
 37	const unsigned char *dest = skb->data;
 38	struct net_bridge_fdb_entry *dst;
 39	struct net_bridge_mdb_entry *mdst;
 40	struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
 41	const struct nf_br_ops *nf_ops;
 
 
 42	u16 vid = 0;
 43
 44	rcu_read_lock();
 45	nf_ops = rcu_dereference(nf_br_ops);
 46	if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
 47		rcu_read_unlock();
 48		return NETDEV_TX_OK;
 49	}
 50
 51	u64_stats_update_begin(&brstats->syncp);
 52	brstats->tx_packets++;
 53	brstats->tx_bytes += skb->len;
 54	u64_stats_update_end(&brstats->syncp);
 55
 
 56	BR_INPUT_SKB_CB(skb)->brdev = dev;
 
 57
 58	skb_reset_mac_header(skb);
 
 59	skb_pull(skb, ETH_HLEN);
 60
 61	if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
 62		goto out;
 63
 64	if (is_broadcast_ether_addr(dest))
 65		br_flood_deliver(br, skb, false);
 66	else if (is_multicast_ether_addr(dest)) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 67		if (unlikely(netpoll_tx_running(dev))) {
 68			br_flood_deliver(br, skb, false);
 69			goto out;
 70		}
 71		if (br_multicast_rcv(br, NULL, skb, vid)) {
 72			kfree_skb(skb);
 73			goto out;
 74		}
 75
 76		mdst = br_mdb_get(br, skb, vid);
 77		if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
 78		    br_multicast_querier_exists(br, eth_hdr(skb)))
 79			br_multicast_deliver(mdst, skb);
 80		else
 81			br_flood_deliver(br, skb, false);
 82	} else if ((dst = __br_fdb_get(br, dest, vid)) != NULL)
 83		br_deliver(dst->dst, skb);
 84	else
 85		br_flood_deliver(br, skb, true);
 86
 87out:
 88	rcu_read_unlock();
 89	return NETDEV_TX_OK;
 90}
 91
 92static void br_set_lockdep_class(struct net_device *dev)
 93{
 94	lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
 95}
 96
 97static int br_dev_init(struct net_device *dev)
 98{
 99	struct net_bridge *br = netdev_priv(dev);
100	int err;
101
102	br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
103	if (!br->stats)
104		return -ENOMEM;
105
 
 
 
 
 
 
 
 
 
 
 
 
 
106	err = br_vlan_init(br);
107	if (err)
108		free_percpu(br->stats);
109	br_set_lockdep_class(dev);
 
 
 
 
 
 
 
 
 
 
 
110
111	return err;
112}
113
 
 
 
 
 
 
 
 
 
 
 
 
114static int br_dev_open(struct net_device *dev)
115{
116	struct net_bridge *br = netdev_priv(dev);
117
118	netdev_update_features(dev);
119	netif_start_queue(dev);
120	br_stp_enable_bridge(br);
121	br_multicast_open(br);
122
123	return 0;
124}
125
126static void br_dev_set_multicast_list(struct net_device *dev)
127{
128}
129
130static void br_dev_change_rx_flags(struct net_device *dev, int change)
131{
132	if (change & IFF_PROMISC)
133		br_manage_promisc(netdev_priv(dev));
134}
135
136static int br_dev_stop(struct net_device *dev)
137{
138	struct net_bridge *br = netdev_priv(dev);
139
140	br_stp_disable_bridge(br);
141	br_multicast_stop(br);
142
143	netif_stop_queue(dev);
144
145	return 0;
146}
147
148static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
149						struct rtnl_link_stats64 *stats)
150{
151	struct net_bridge *br = netdev_priv(dev);
152	struct pcpu_sw_netstats tmp, sum = { 0 };
153	unsigned int cpu;
154
155	for_each_possible_cpu(cpu) {
156		unsigned int start;
157		const struct pcpu_sw_netstats *bstats
158			= per_cpu_ptr(br->stats, cpu);
159		do {
160			start = u64_stats_fetch_begin_irq(&bstats->syncp);
161			memcpy(&tmp, bstats, sizeof(tmp));
162		} while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
163		sum.tx_bytes   += tmp.tx_bytes;
164		sum.tx_packets += tmp.tx_packets;
165		sum.rx_bytes   += tmp.rx_bytes;
166		sum.rx_packets += tmp.rx_packets;
167	}
168
169	stats->tx_bytes   = sum.tx_bytes;
170	stats->tx_packets = sum.tx_packets;
171	stats->rx_bytes   = sum.rx_bytes;
172	stats->rx_packets = sum.rx_packets;
173
174	return stats;
175}
176
177static int br_change_mtu(struct net_device *dev, int new_mtu)
178{
179	struct net_bridge *br = netdev_priv(dev);
180	if (new_mtu < 68 || new_mtu > br_min_mtu(br))
181		return -EINVAL;
182
183	dev->mtu = new_mtu;
184
 
 
185#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
186	/* remember the MTU in the rtable for PMTU */
187	dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
188#endif
189
190	return 0;
191}
192
193/* Allow setting mac address to any valid ethernet address. */
194static int br_set_mac_address(struct net_device *dev, void *p)
195{
196	struct net_bridge *br = netdev_priv(dev);
197	struct sockaddr *addr = p;
198
199	if (!is_valid_ether_addr(addr->sa_data))
200		return -EADDRNOTAVAIL;
201
202	spin_lock_bh(&br->lock);
203	if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
204		/* Mac address will be changed in br_stp_change_bridge_id(). */
205		br_stp_change_bridge_id(br, addr->sa_data);
206	}
207	spin_unlock_bh(&br->lock);
208
209	return 0;
210}
211
212static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
213{
214	strlcpy(info->driver, "bridge", sizeof(info->driver));
215	strlcpy(info->version, BR_VERSION, sizeof(info->version));
216	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
217	strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
218}
219
220static netdev_features_t br_fix_features(struct net_device *dev,
221	netdev_features_t features)
222{
223	struct net_bridge *br = netdev_priv(dev);
224
225	return br_features_recompute(br, features);
226}
227
228#ifdef CONFIG_NET_POLL_CONTROLLER
229static void br_poll_controller(struct net_device *br_dev)
230{
231}
232
233static void br_netpoll_cleanup(struct net_device *dev)
234{
235	struct net_bridge *br = netdev_priv(dev);
236	struct net_bridge_port *p;
237
238	list_for_each_entry(p, &br->port_list, list)
239		br_netpoll_disable(p);
240}
241
242static int __br_netpoll_enable(struct net_bridge_port *p)
243{
244	struct netpoll *np;
245	int err;
246
247	np = kzalloc(sizeof(*p->np), GFP_KERNEL);
248	if (!np)
249		return -ENOMEM;
250
251	err = __netpoll_setup(np, p->dev);
252	if (err) {
253		kfree(np);
254		return err;
255	}
256
257	p->np = np;
258	return err;
259}
260
261int br_netpoll_enable(struct net_bridge_port *p)
262{
263	if (!p->br->dev->npinfo)
264		return 0;
265
266	return __br_netpoll_enable(p);
267}
268
269static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
270{
271	struct net_bridge *br = netdev_priv(dev);
272	struct net_bridge_port *p;
273	int err = 0;
274
275	list_for_each_entry(p, &br->port_list, list) {
276		if (!p->dev)
277			continue;
278		err = __br_netpoll_enable(p);
279		if (err)
280			goto fail;
281	}
282
283out:
284	return err;
285
286fail:
287	br_netpoll_cleanup(dev);
288	goto out;
289}
290
291void br_netpoll_disable(struct net_bridge_port *p)
292{
293	struct netpoll *np = p->np;
294
295	if (!np)
296		return;
297
298	p->np = NULL;
299
300	__netpoll_free_async(np);
301}
302
303#endif
304
305static int br_add_slave(struct net_device *dev, struct net_device *slave_dev)
 
306
307{
308	struct net_bridge *br = netdev_priv(dev);
309
310	return br_add_if(br, slave_dev);
311}
312
313static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
314{
315	struct net_bridge *br = netdev_priv(dev);
316
317	return br_del_if(br, slave_dev);
318}
319
320static const struct ethtool_ops br_ethtool_ops = {
321	.get_drvinfo    = br_getinfo,
322	.get_link	= ethtool_op_get_link,
323};
324
325static const struct net_device_ops br_netdev_ops = {
326	.ndo_open		 = br_dev_open,
327	.ndo_stop		 = br_dev_stop,
328	.ndo_init		 = br_dev_init,
 
329	.ndo_start_xmit		 = br_dev_xmit,
330	.ndo_get_stats64	 = br_get_stats64,
331	.ndo_set_mac_address	 = br_set_mac_address,
332	.ndo_set_rx_mode	 = br_dev_set_multicast_list,
333	.ndo_change_rx_flags	 = br_dev_change_rx_flags,
334	.ndo_change_mtu		 = br_change_mtu,
335	.ndo_do_ioctl		 = br_dev_ioctl,
336#ifdef CONFIG_NET_POLL_CONTROLLER
337	.ndo_netpoll_setup	 = br_netpoll_setup,
338	.ndo_netpoll_cleanup	 = br_netpoll_cleanup,
339	.ndo_poll_controller	 = br_poll_controller,
340#endif
341	.ndo_add_slave		 = br_add_slave,
342	.ndo_del_slave		 = br_del_slave,
343	.ndo_fix_features        = br_fix_features,
344	.ndo_fdb_add		 = br_fdb_add,
345	.ndo_fdb_del		 = br_fdb_delete,
346	.ndo_fdb_dump		 = br_fdb_dump,
 
347	.ndo_bridge_getlink	 = br_getlink,
348	.ndo_bridge_setlink	 = br_setlink,
349	.ndo_bridge_dellink	 = br_dellink,
350	.ndo_features_check	 = passthru_features_check,
351};
352
353static void br_dev_free(struct net_device *dev)
354{
355	struct net_bridge *br = netdev_priv(dev);
356
357	free_percpu(br->stats);
358	free_netdev(dev);
359}
360
361static struct device_type br_type = {
362	.name	= "bridge",
363};
364
365void br_dev_setup(struct net_device *dev)
366{
367	struct net_bridge *br = netdev_priv(dev);
368
369	eth_hw_addr_random(dev);
370	ether_setup(dev);
371
372	dev->netdev_ops = &br_netdev_ops;
373	dev->destructor = br_dev_free;
374	dev->ethtool_ops = &br_ethtool_ops;
375	SET_NETDEV_DEVTYPE(dev, &br_type);
376	dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
377
378	dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
379			NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
380	dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
381			   NETIF_F_HW_VLAN_STAG_TX;
382	dev->vlan_features = COMMON_FEATURES;
383
384	br->dev = dev;
385	spin_lock_init(&br->lock);
386	INIT_LIST_HEAD(&br->port_list);
 
387	spin_lock_init(&br->hash_lock);
388
389	br->bridge_id.prio[0] = 0x80;
390	br->bridge_id.prio[1] = 0x00;
391
392	ether_addr_copy(br->group_addr, eth_reserved_addr_base);
393
394	br->stp_enabled = BR_NO_STP;
395	br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
396	br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
397
398	br->designated_root = br->bridge_id;
399	br->bridge_max_age = br->max_age = 20 * HZ;
400	br->bridge_hello_time = br->hello_time = 2 * HZ;
401	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
402	br->ageing_time = BR_DEFAULT_AGEING_TIME;
 
403
404	br_netfilter_rtable_init(br);
405	br_stp_timer_init(br);
406	br_multicast_init(br);
 
407}
v5.4
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *	Device handling code
  4 *	Linux ethernet bridge
  5 *
  6 *	Authors:
  7 *	Lennert Buytenhek		<buytenh@gnu.org>
 
 
 
 
 
  8 */
  9
 10#include <linux/kernel.h>
 11#include <linux/netdevice.h>
 12#include <linux/netpoll.h>
 13#include <linux/etherdevice.h>
 14#include <linux/ethtool.h>
 15#include <linux/list.h>
 16#include <linux/netfilter_bridge.h>
 17
 18#include <linux/uaccess.h>
 19#include "br_private.h"
 20
 21#define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
 22			 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
 23
 24const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
 25EXPORT_SYMBOL_GPL(nf_br_ops);
 26
 
 
 27/* net device transmit always called with BH disabled */
 28netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 29{
 30	struct net_bridge *br = netdev_priv(dev);
 
 31	struct net_bridge_fdb_entry *dst;
 32	struct net_bridge_mdb_entry *mdst;
 33	struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
 34	const struct nf_br_ops *nf_ops;
 35	const unsigned char *dest;
 36	struct ethhdr *eth;
 37	u16 vid = 0;
 38
 39	rcu_read_lock();
 40	nf_ops = rcu_dereference(nf_br_ops);
 41	if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
 42		rcu_read_unlock();
 43		return NETDEV_TX_OK;
 44	}
 45
 46	u64_stats_update_begin(&brstats->syncp);
 47	brstats->tx_packets++;
 48	brstats->tx_bytes += skb->len;
 49	u64_stats_update_end(&brstats->syncp);
 50
 51	br_switchdev_frame_unmark(skb);
 52	BR_INPUT_SKB_CB(skb)->brdev = dev;
 53	BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
 54
 55	skb_reset_mac_header(skb);
 56	eth = eth_hdr(skb);
 57	skb_pull(skb, ETH_HLEN);
 58
 59	if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
 60		goto out;
 61
 62	if (IS_ENABLED(CONFIG_INET) &&
 63	    (eth->h_proto == htons(ETH_P_ARP) ||
 64	     eth->h_proto == htons(ETH_P_RARP)) &&
 65	    br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
 66		br_do_proxy_suppress_arp(skb, br, vid, NULL);
 67	} else if (IS_ENABLED(CONFIG_IPV6) &&
 68		   skb->protocol == htons(ETH_P_IPV6) &&
 69		   br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
 70		   pskb_may_pull(skb, sizeof(struct ipv6hdr) +
 71				 sizeof(struct nd_msg)) &&
 72		   ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
 73			struct nd_msg *msg, _msg;
 74
 75			msg = br_is_nd_neigh_msg(skb, &_msg);
 76			if (msg)
 77				br_do_suppress_nd(skb, br, vid, NULL, msg);
 78	}
 79
 80	dest = eth_hdr(skb)->h_dest;
 81	if (is_broadcast_ether_addr(dest)) {
 82		br_flood(br, skb, BR_PKT_BROADCAST, false, true);
 83	} else if (is_multicast_ether_addr(dest)) {
 84		if (unlikely(netpoll_tx_running(dev))) {
 85			br_flood(br, skb, BR_PKT_MULTICAST, false, true);
 86			goto out;
 87		}
 88		if (br_multicast_rcv(br, NULL, skb, vid)) {
 89			kfree_skb(skb);
 90			goto out;
 91		}
 92
 93		mdst = br_mdb_get(br, skb, vid);
 94		if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
 95		    br_multicast_querier_exists(br, eth_hdr(skb)))
 96			br_multicast_flood(mdst, skb, false, true);
 97		else
 98			br_flood(br, skb, BR_PKT_MULTICAST, false, true);
 99	} else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
100		br_forward(dst->dst, skb, false, true);
101	} else {
102		br_flood(br, skb, BR_PKT_UNICAST, false, true);
103	}
104out:
105	rcu_read_unlock();
106	return NETDEV_TX_OK;
107}
108
 
 
 
 
 
109static int br_dev_init(struct net_device *dev)
110{
111	struct net_bridge *br = netdev_priv(dev);
112	int err;
113
114	br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
115	if (!br->stats)
116		return -ENOMEM;
117
118	err = br_fdb_hash_init(br);
119	if (err) {
120		free_percpu(br->stats);
121		return err;
122	}
123
124	err = br_mdb_hash_init(br);
125	if (err) {
126		free_percpu(br->stats);
127		br_fdb_hash_fini(br);
128		return err;
129	}
130
131	err = br_vlan_init(br);
132	if (err) {
133		free_percpu(br->stats);
134		br_mdb_hash_fini(br);
135		br_fdb_hash_fini(br);
136		return err;
137	}
138
139	err = br_multicast_init_stats(br);
140	if (err) {
141		free_percpu(br->stats);
142		br_vlan_flush(br);
143		br_mdb_hash_fini(br);
144		br_fdb_hash_fini(br);
145	}
146
147	return err;
148}
149
150static void br_dev_uninit(struct net_device *dev)
151{
152	struct net_bridge *br = netdev_priv(dev);
153
154	br_multicast_dev_del(br);
155	br_multicast_uninit_stats(br);
156	br_vlan_flush(br);
157	br_mdb_hash_fini(br);
158	br_fdb_hash_fini(br);
159	free_percpu(br->stats);
160}
161
162static int br_dev_open(struct net_device *dev)
163{
164	struct net_bridge *br = netdev_priv(dev);
165
166	netdev_update_features(dev);
167	netif_start_queue(dev);
168	br_stp_enable_bridge(br);
169	br_multicast_open(br);
170
171	return 0;
172}
173
174static void br_dev_set_multicast_list(struct net_device *dev)
175{
176}
177
178static void br_dev_change_rx_flags(struct net_device *dev, int change)
179{
180	if (change & IFF_PROMISC)
181		br_manage_promisc(netdev_priv(dev));
182}
183
184static int br_dev_stop(struct net_device *dev)
185{
186	struct net_bridge *br = netdev_priv(dev);
187
188	br_stp_disable_bridge(br);
189	br_multicast_stop(br);
190
191	netif_stop_queue(dev);
192
193	return 0;
194}
195
196static void br_get_stats64(struct net_device *dev,
197			   struct rtnl_link_stats64 *stats)
198{
199	struct net_bridge *br = netdev_priv(dev);
200	struct pcpu_sw_netstats tmp, sum = { 0 };
201	unsigned int cpu;
202
203	for_each_possible_cpu(cpu) {
204		unsigned int start;
205		const struct pcpu_sw_netstats *bstats
206			= per_cpu_ptr(br->stats, cpu);
207		do {
208			start = u64_stats_fetch_begin_irq(&bstats->syncp);
209			memcpy(&tmp, bstats, sizeof(tmp));
210		} while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
211		sum.tx_bytes   += tmp.tx_bytes;
212		sum.tx_packets += tmp.tx_packets;
213		sum.rx_bytes   += tmp.rx_bytes;
214		sum.rx_packets += tmp.rx_packets;
215	}
216
217	stats->tx_bytes   = sum.tx_bytes;
218	stats->tx_packets = sum.tx_packets;
219	stats->rx_bytes   = sum.rx_bytes;
220	stats->rx_packets = sum.rx_packets;
 
 
221}
222
223static int br_change_mtu(struct net_device *dev, int new_mtu)
224{
225	struct net_bridge *br = netdev_priv(dev);
 
 
226
227	dev->mtu = new_mtu;
228
229	/* this flag will be cleared if the MTU was automatically adjusted */
230	br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
231#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
232	/* remember the MTU in the rtable for PMTU */
233	dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
234#endif
235
236	return 0;
237}
238
239/* Allow setting mac address to any valid ethernet address. */
240static int br_set_mac_address(struct net_device *dev, void *p)
241{
242	struct net_bridge *br = netdev_priv(dev);
243	struct sockaddr *addr = p;
244
245	if (!is_valid_ether_addr(addr->sa_data))
246		return -EADDRNOTAVAIL;
247
248	spin_lock_bh(&br->lock);
249	if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
250		/* Mac address will be changed in br_stp_change_bridge_id(). */
251		br_stp_change_bridge_id(br, addr->sa_data);
252	}
253	spin_unlock_bh(&br->lock);
254
255	return 0;
256}
257
258static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
259{
260	strlcpy(info->driver, "bridge", sizeof(info->driver));
261	strlcpy(info->version, BR_VERSION, sizeof(info->version));
262	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
263	strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
264}
265
266static netdev_features_t br_fix_features(struct net_device *dev,
267	netdev_features_t features)
268{
269	struct net_bridge *br = netdev_priv(dev);
270
271	return br_features_recompute(br, features);
272}
273
274#ifdef CONFIG_NET_POLL_CONTROLLER
275static void br_poll_controller(struct net_device *br_dev)
276{
277}
278
279static void br_netpoll_cleanup(struct net_device *dev)
280{
281	struct net_bridge *br = netdev_priv(dev);
282	struct net_bridge_port *p;
283
284	list_for_each_entry(p, &br->port_list, list)
285		br_netpoll_disable(p);
286}
287
288static int __br_netpoll_enable(struct net_bridge_port *p)
289{
290	struct netpoll *np;
291	int err;
292
293	np = kzalloc(sizeof(*p->np), GFP_KERNEL);
294	if (!np)
295		return -ENOMEM;
296
297	err = __netpoll_setup(np, p->dev);
298	if (err) {
299		kfree(np);
300		return err;
301	}
302
303	p->np = np;
304	return err;
305}
306
307int br_netpoll_enable(struct net_bridge_port *p)
308{
309	if (!p->br->dev->npinfo)
310		return 0;
311
312	return __br_netpoll_enable(p);
313}
314
315static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
316{
317	struct net_bridge *br = netdev_priv(dev);
318	struct net_bridge_port *p;
319	int err = 0;
320
321	list_for_each_entry(p, &br->port_list, list) {
322		if (!p->dev)
323			continue;
324		err = __br_netpoll_enable(p);
325		if (err)
326			goto fail;
327	}
328
329out:
330	return err;
331
332fail:
333	br_netpoll_cleanup(dev);
334	goto out;
335}
336
337void br_netpoll_disable(struct net_bridge_port *p)
338{
339	struct netpoll *np = p->np;
340
341	if (!np)
342		return;
343
344	p->np = NULL;
345
346	__netpoll_free(np);
347}
348
349#endif
350
351static int br_add_slave(struct net_device *dev, struct net_device *slave_dev,
352			struct netlink_ext_ack *extack)
353
354{
355	struct net_bridge *br = netdev_priv(dev);
356
357	return br_add_if(br, slave_dev, extack);
358}
359
360static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
361{
362	struct net_bridge *br = netdev_priv(dev);
363
364	return br_del_if(br, slave_dev);
365}
366
367static const struct ethtool_ops br_ethtool_ops = {
368	.get_drvinfo    = br_getinfo,
369	.get_link	= ethtool_op_get_link,
370};
371
372static const struct net_device_ops br_netdev_ops = {
373	.ndo_open		 = br_dev_open,
374	.ndo_stop		 = br_dev_stop,
375	.ndo_init		 = br_dev_init,
376	.ndo_uninit		 = br_dev_uninit,
377	.ndo_start_xmit		 = br_dev_xmit,
378	.ndo_get_stats64	 = br_get_stats64,
379	.ndo_set_mac_address	 = br_set_mac_address,
380	.ndo_set_rx_mode	 = br_dev_set_multicast_list,
381	.ndo_change_rx_flags	 = br_dev_change_rx_flags,
382	.ndo_change_mtu		 = br_change_mtu,
383	.ndo_do_ioctl		 = br_dev_ioctl,
384#ifdef CONFIG_NET_POLL_CONTROLLER
385	.ndo_netpoll_setup	 = br_netpoll_setup,
386	.ndo_netpoll_cleanup	 = br_netpoll_cleanup,
387	.ndo_poll_controller	 = br_poll_controller,
388#endif
389	.ndo_add_slave		 = br_add_slave,
390	.ndo_del_slave		 = br_del_slave,
391	.ndo_fix_features        = br_fix_features,
392	.ndo_fdb_add		 = br_fdb_add,
393	.ndo_fdb_del		 = br_fdb_delete,
394	.ndo_fdb_dump		 = br_fdb_dump,
395	.ndo_fdb_get		 = br_fdb_get,
396	.ndo_bridge_getlink	 = br_getlink,
397	.ndo_bridge_setlink	 = br_setlink,
398	.ndo_bridge_dellink	 = br_dellink,
399	.ndo_features_check	 = passthru_features_check,
400};
401
 
 
 
 
 
 
 
 
402static struct device_type br_type = {
403	.name	= "bridge",
404};
405
406void br_dev_setup(struct net_device *dev)
407{
408	struct net_bridge *br = netdev_priv(dev);
409
410	eth_hw_addr_random(dev);
411	ether_setup(dev);
412
413	dev->netdev_ops = &br_netdev_ops;
414	dev->needs_free_netdev = true;
415	dev->ethtool_ops = &br_ethtool_ops;
416	SET_NETDEV_DEVTYPE(dev, &br_type);
417	dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
418
419	dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
420			NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
421	dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
422			   NETIF_F_HW_VLAN_STAG_TX;
423	dev->vlan_features = COMMON_FEATURES;
424
425	br->dev = dev;
426	spin_lock_init(&br->lock);
427	INIT_LIST_HEAD(&br->port_list);
428	INIT_HLIST_HEAD(&br->fdb_list);
429	spin_lock_init(&br->hash_lock);
430
431	br->bridge_id.prio[0] = 0x80;
432	br->bridge_id.prio[1] = 0x00;
433
434	ether_addr_copy(br->group_addr, eth_stp_addr);
435
436	br->stp_enabled = BR_NO_STP;
437	br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
438	br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
439
440	br->designated_root = br->bridge_id;
441	br->bridge_max_age = br->max_age = 20 * HZ;
442	br->bridge_hello_time = br->hello_time = 2 * HZ;
443	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
444	br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
445	dev->max_mtu = ETH_MAX_MTU;
446
447	br_netfilter_rtable_init(br);
448	br_stp_timer_init(br);
449	br_multicast_init(br);
450	INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
451}