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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 enum skb_drop_reason reason = pskb_may_pull_reason(skb, ETH_HLEN);
31 struct net_bridge_mcast_port *pmctx_null = NULL;
32 struct net_bridge *br = netdev_priv(dev);
33 struct net_bridge_mcast *brmctx = &br->multicast_ctx;
34 struct net_bridge_fdb_entry *dst;
35 struct net_bridge_mdb_entry *mdst;
36 const struct nf_br_ops *nf_ops;
37 u8 state = BR_STATE_FORWARDING;
38 struct net_bridge_vlan *vlan;
39 const unsigned char *dest;
40 u16 vid = 0;
41
42 if (unlikely(reason != SKB_NOT_DROPPED_YET)) {
43 kfree_skb_reason(skb, reason);
44 return NETDEV_TX_OK;
45 }
46
47 memset(skb->cb, 0, sizeof(struct br_input_skb_cb));
48 br_tc_skb_miss_set(skb, false);
49
50 rcu_read_lock();
51 nf_ops = rcu_dereference(nf_br_ops);
52 if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
53 rcu_read_unlock();
54 return NETDEV_TX_OK;
55 }
56
57 dev_sw_netstats_tx_add(dev, 1, skb->len);
58
59 br_switchdev_frame_unmark(skb);
60 BR_INPUT_SKB_CB(skb)->brdev = dev;
61 BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
62
63 skb_reset_mac_header(skb);
64 skb_pull(skb, ETH_HLEN);
65
66 if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid,
67 &state, &vlan))
68 goto out;
69
70 if (IS_ENABLED(CONFIG_INET) &&
71 (eth_hdr(skb)->h_proto == htons(ETH_P_ARP) ||
72 eth_hdr(skb)->h_proto == htons(ETH_P_RARP)) &&
73 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
74 br_do_proxy_suppress_arp(skb, br, vid, NULL);
75 } else if (IS_ENABLED(CONFIG_IPV6) &&
76 skb->protocol == htons(ETH_P_IPV6) &&
77 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
78 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
79 sizeof(struct nd_msg)) &&
80 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
81 struct nd_msg *msg, _msg;
82
83 msg = br_is_nd_neigh_msg(skb, &_msg);
84 if (msg)
85 br_do_suppress_nd(skb, br, vid, NULL, msg);
86 }
87
88 dest = eth_hdr(skb)->h_dest;
89 if (is_broadcast_ether_addr(dest)) {
90 br_flood(br, skb, BR_PKT_BROADCAST, false, true, vid);
91 } else if (is_multicast_ether_addr(dest)) {
92 if (unlikely(netpoll_tx_running(dev))) {
93 br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
94 goto out;
95 }
96 if (br_multicast_rcv(&brmctx, &pmctx_null, vlan, skb, vid)) {
97 kfree_skb(skb);
98 goto out;
99 }
100
101 mdst = br_mdb_entry_skb_get(brmctx, skb, vid);
102 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
103 br_multicast_querier_exists(brmctx, eth_hdr(skb), mdst))
104 br_multicast_flood(mdst, skb, brmctx, false, true);
105 else
106 br_flood(br, skb, BR_PKT_MULTICAST, false, true, vid);
107 } else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
108 br_forward(dst->dst, skb, false, true);
109 } else {
110 br_flood(br, skb, BR_PKT_UNICAST, false, true, vid);
111 }
112out:
113 rcu_read_unlock();
114 return NETDEV_TX_OK;
115}
116
117static int br_dev_init(struct net_device *dev)
118{
119 struct net_bridge *br = netdev_priv(dev);
120 int err;
121
122 err = br_fdb_hash_init(br);
123 if (err)
124 return err;
125
126 err = br_mdb_hash_init(br);
127 if (err) {
128 br_fdb_hash_fini(br);
129 return err;
130 }
131
132 err = br_vlan_init(br);
133 if (err) {
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 br_vlan_flush(br);
142 br_mdb_hash_fini(br);
143 br_fdb_hash_fini(br);
144 return err;
145 }
146
147 netdev_lockdep_set_classes(dev);
148 return 0;
149}
150
151static void br_dev_uninit(struct net_device *dev)
152{
153 struct net_bridge *br = netdev_priv(dev);
154
155 br_multicast_dev_del(br);
156 br_multicast_uninit_stats(br);
157 br_vlan_flush(br);
158 br_mdb_hash_fini(br);
159 br_fdb_hash_fini(br);
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 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
172 br_multicast_join_snoopers(br);
173
174 return 0;
175}
176
177static void br_dev_set_multicast_list(struct net_device *dev)
178{
179}
180
181static void br_dev_change_rx_flags(struct net_device *dev, int change)
182{
183 if (change & IFF_PROMISC)
184 br_manage_promisc(netdev_priv(dev));
185}
186
187static int br_dev_stop(struct net_device *dev)
188{
189 struct net_bridge *br = netdev_priv(dev);
190
191 br_stp_disable_bridge(br);
192 br_multicast_stop(br);
193
194 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
195 br_multicast_leave_snoopers(br);
196
197 netif_stop_queue(dev);
198
199 return 0;
200}
201
202static int br_change_mtu(struct net_device *dev, int new_mtu)
203{
204 struct net_bridge *br = netdev_priv(dev);
205
206 dev->mtu = new_mtu;
207
208 /* this flag will be cleared if the MTU was automatically adjusted */
209 br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
210#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
211 /* remember the MTU in the rtable for PMTU */
212 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
213#endif
214
215 return 0;
216}
217
218/* Allow setting mac address to any valid ethernet address. */
219static int br_set_mac_address(struct net_device *dev, void *p)
220{
221 struct net_bridge *br = netdev_priv(dev);
222 struct sockaddr *addr = p;
223
224 if (!is_valid_ether_addr(addr->sa_data))
225 return -EADDRNOTAVAIL;
226
227 /* dev_set_mac_addr() can be called by a master device on bridge's
228 * NETDEV_UNREGISTER, but since it's being destroyed do nothing
229 */
230 if (dev->reg_state != NETREG_REGISTERED)
231 return -EBUSY;
232
233 spin_lock_bh(&br->lock);
234 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
235 /* Mac address will be changed in br_stp_change_bridge_id(). */
236 br_stp_change_bridge_id(br, addr->sa_data);
237 }
238 spin_unlock_bh(&br->lock);
239
240 return 0;
241}
242
243static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
244{
245 strscpy(info->driver, "bridge", sizeof(info->driver));
246 strscpy(info->version, BR_VERSION, sizeof(info->version));
247 strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
248 strscpy(info->bus_info, "N/A", sizeof(info->bus_info));
249}
250
251static int br_get_link_ksettings(struct net_device *dev,
252 struct ethtool_link_ksettings *cmd)
253{
254 struct net_bridge *br = netdev_priv(dev);
255 struct net_bridge_port *p;
256
257 cmd->base.duplex = DUPLEX_UNKNOWN;
258 cmd->base.port = PORT_OTHER;
259 cmd->base.speed = SPEED_UNKNOWN;
260
261 list_for_each_entry(p, &br->port_list, list) {
262 struct ethtool_link_ksettings ecmd;
263 struct net_device *pdev = p->dev;
264
265 if (!netif_running(pdev) || !netif_oper_up(pdev))
266 continue;
267
268 if (__ethtool_get_link_ksettings(pdev, &ecmd))
269 continue;
270
271 if (ecmd.base.speed == (__u32)SPEED_UNKNOWN)
272 continue;
273
274 if (cmd->base.speed == (__u32)SPEED_UNKNOWN ||
275 cmd->base.speed < ecmd.base.speed)
276 cmd->base.speed = ecmd.base.speed;
277 }
278
279 return 0;
280}
281
282static netdev_features_t br_fix_features(struct net_device *dev,
283 netdev_features_t features)
284{
285 struct net_bridge *br = netdev_priv(dev);
286
287 return br_features_recompute(br, features);
288}
289
290#ifdef CONFIG_NET_POLL_CONTROLLER
291static void br_poll_controller(struct net_device *br_dev)
292{
293}
294
295static void br_netpoll_cleanup(struct net_device *dev)
296{
297 struct net_bridge *br = netdev_priv(dev);
298 struct net_bridge_port *p;
299
300 list_for_each_entry(p, &br->port_list, list)
301 br_netpoll_disable(p);
302}
303
304static int __br_netpoll_enable(struct net_bridge_port *p)
305{
306 struct netpoll *np;
307 int err;
308
309 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
310 if (!np)
311 return -ENOMEM;
312
313 err = __netpoll_setup(np, p->dev);
314 if (err) {
315 kfree(np);
316 return err;
317 }
318
319 p->np = np;
320 return err;
321}
322
323int br_netpoll_enable(struct net_bridge_port *p)
324{
325 if (!p->br->dev->npinfo)
326 return 0;
327
328 return __br_netpoll_enable(p);
329}
330
331static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
332{
333 struct net_bridge *br = netdev_priv(dev);
334 struct net_bridge_port *p;
335 int err = 0;
336
337 list_for_each_entry(p, &br->port_list, list) {
338 if (!p->dev)
339 continue;
340 err = __br_netpoll_enable(p);
341 if (err)
342 goto fail;
343 }
344
345out:
346 return err;
347
348fail:
349 br_netpoll_cleanup(dev);
350 goto out;
351}
352
353void br_netpoll_disable(struct net_bridge_port *p)
354{
355 struct netpoll *np = p->np;
356
357 if (!np)
358 return;
359
360 p->np = NULL;
361
362 __netpoll_free(np);
363}
364
365#endif
366
367static int br_add_slave(struct net_device *dev, struct net_device *slave_dev,
368 struct netlink_ext_ack *extack)
369
370{
371 struct net_bridge *br = netdev_priv(dev);
372
373 return br_add_if(br, slave_dev, extack);
374}
375
376static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
377{
378 struct net_bridge *br = netdev_priv(dev);
379
380 return br_del_if(br, slave_dev);
381}
382
383static int br_fill_forward_path(struct net_device_path_ctx *ctx,
384 struct net_device_path *path)
385{
386 struct net_bridge_fdb_entry *f;
387 struct net_bridge_port *dst;
388 struct net_bridge *br;
389
390 if (netif_is_bridge_port(ctx->dev))
391 return -1;
392
393 br = netdev_priv(ctx->dev);
394
395 br_vlan_fill_forward_path_pvid(br, ctx, path);
396
397 f = br_fdb_find_rcu(br, ctx->daddr, path->bridge.vlan_id);
398 if (!f || !f->dst)
399 return -1;
400
401 dst = READ_ONCE(f->dst);
402 if (!dst)
403 return -1;
404
405 if (br_vlan_fill_forward_path_mode(br, dst, path))
406 return -1;
407
408 path->type = DEV_PATH_BRIDGE;
409 path->dev = dst->br->dev;
410 ctx->dev = dst->dev;
411
412 switch (path->bridge.vlan_mode) {
413 case DEV_PATH_BR_VLAN_TAG:
414 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
415 return -ENOSPC;
416 ctx->vlan[ctx->num_vlans].id = path->bridge.vlan_id;
417 ctx->vlan[ctx->num_vlans].proto = path->bridge.vlan_proto;
418 ctx->num_vlans++;
419 break;
420 case DEV_PATH_BR_VLAN_UNTAG_HW:
421 case DEV_PATH_BR_VLAN_UNTAG:
422 ctx->num_vlans--;
423 break;
424 case DEV_PATH_BR_VLAN_KEEP:
425 break;
426 }
427
428 return 0;
429}
430
431static const struct ethtool_ops br_ethtool_ops = {
432 .get_drvinfo = br_getinfo,
433 .get_link = ethtool_op_get_link,
434 .get_link_ksettings = br_get_link_ksettings,
435};
436
437static const struct net_device_ops br_netdev_ops = {
438 .ndo_open = br_dev_open,
439 .ndo_stop = br_dev_stop,
440 .ndo_init = br_dev_init,
441 .ndo_uninit = br_dev_uninit,
442 .ndo_start_xmit = br_dev_xmit,
443 .ndo_get_stats64 = dev_get_tstats64,
444 .ndo_set_mac_address = br_set_mac_address,
445 .ndo_set_rx_mode = br_dev_set_multicast_list,
446 .ndo_change_rx_flags = br_dev_change_rx_flags,
447 .ndo_change_mtu = br_change_mtu,
448 .ndo_siocdevprivate = br_dev_siocdevprivate,
449#ifdef CONFIG_NET_POLL_CONTROLLER
450 .ndo_netpoll_setup = br_netpoll_setup,
451 .ndo_netpoll_cleanup = br_netpoll_cleanup,
452 .ndo_poll_controller = br_poll_controller,
453#endif
454 .ndo_add_slave = br_add_slave,
455 .ndo_del_slave = br_del_slave,
456 .ndo_fix_features = br_fix_features,
457 .ndo_fdb_add = br_fdb_add,
458 .ndo_fdb_del = br_fdb_delete,
459 .ndo_fdb_del_bulk = br_fdb_delete_bulk,
460 .ndo_fdb_dump = br_fdb_dump,
461 .ndo_fdb_get = br_fdb_get,
462 .ndo_mdb_add = br_mdb_add,
463 .ndo_mdb_del = br_mdb_del,
464 .ndo_mdb_del_bulk = br_mdb_del_bulk,
465 .ndo_mdb_dump = br_mdb_dump,
466 .ndo_mdb_get = br_mdb_get,
467 .ndo_bridge_getlink = br_getlink,
468 .ndo_bridge_setlink = br_setlink,
469 .ndo_bridge_dellink = br_dellink,
470 .ndo_features_check = passthru_features_check,
471 .ndo_fill_forward_path = br_fill_forward_path,
472};
473
474static const struct device_type br_type = {
475 .name = "bridge",
476};
477
478void br_dev_setup(struct net_device *dev)
479{
480 struct net_bridge *br = netdev_priv(dev);
481
482 eth_hw_addr_random(dev);
483 ether_setup(dev);
484
485 dev->netdev_ops = &br_netdev_ops;
486 dev->needs_free_netdev = true;
487 dev->ethtool_ops = &br_ethtool_ops;
488 SET_NETDEV_DEVTYPE(dev, &br_type);
489 dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
490
491 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
492 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
493 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
494 NETIF_F_HW_VLAN_STAG_TX;
495 dev->vlan_features = COMMON_FEATURES;
496 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
497
498 br->dev = dev;
499 spin_lock_init(&br->lock);
500 INIT_LIST_HEAD(&br->port_list);
501 INIT_HLIST_HEAD(&br->fdb_list);
502 INIT_HLIST_HEAD(&br->frame_type_list);
503#if IS_ENABLED(CONFIG_BRIDGE_MRP)
504 INIT_HLIST_HEAD(&br->mrp_list);
505#endif
506#if IS_ENABLED(CONFIG_BRIDGE_CFM)
507 INIT_HLIST_HEAD(&br->mep_list);
508#endif
509 spin_lock_init(&br->hash_lock);
510
511 br->bridge_id.prio[0] = 0x80;
512 br->bridge_id.prio[1] = 0x00;
513
514 ether_addr_copy(br->group_addr, eth_stp_addr);
515
516 br->stp_enabled = BR_NO_STP;
517 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
518 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
519
520 br->designated_root = br->bridge_id;
521 br->bridge_max_age = br->max_age = 20 * HZ;
522 br->bridge_hello_time = br->hello_time = 2 * HZ;
523 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
524 br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
525 dev->max_mtu = ETH_MAX_MTU;
526
527 br_netfilter_rtable_init(br);
528 br_stp_timer_init(br);
529 br_multicast_init(br);
530 INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
531}
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 <linux/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 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;
42 struct ethhdr *eth;
43 u16 vid = 0;
44
45 rcu_read_lock();
46 nf_ops = rcu_dereference(nf_br_ops);
47 if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
48 rcu_read_unlock();
49 return NETDEV_TX_OK;
50 }
51
52 u64_stats_update_begin(&brstats->syncp);
53 brstats->tx_packets++;
54 brstats->tx_bytes += skb->len;
55 u64_stats_update_end(&brstats->syncp);
56
57 br_switchdev_frame_unmark(skb);
58 BR_INPUT_SKB_CB(skb)->brdev = dev;
59
60 skb_reset_mac_header(skb);
61 eth = eth_hdr(skb);
62 skb_pull(skb, ETH_HLEN);
63
64 if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
65 goto out;
66
67 if (IS_ENABLED(CONFIG_INET) &&
68 (eth->h_proto == htons(ETH_P_ARP) ||
69 eth->h_proto == htons(ETH_P_RARP)) &&
70 br->neigh_suppress_enabled) {
71 br_do_proxy_suppress_arp(skb, br, vid, NULL);
72 } else if (IS_ENABLED(CONFIG_IPV6) &&
73 skb->protocol == htons(ETH_P_IPV6) &&
74 br->neigh_suppress_enabled &&
75 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
76 sizeof(struct nd_msg)) &&
77 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
78 struct nd_msg *msg, _msg;
79
80 msg = br_is_nd_neigh_msg(skb, &_msg);
81 if (msg)
82 br_do_suppress_nd(skb, br, vid, NULL, msg);
83 }
84
85 dest = eth_hdr(skb)->h_dest;
86 if (is_broadcast_ether_addr(dest)) {
87 br_flood(br, skb, BR_PKT_BROADCAST, false, true);
88 } else if (is_multicast_ether_addr(dest)) {
89 if (unlikely(netpoll_tx_running(dev))) {
90 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
91 goto out;
92 }
93 if (br_multicast_rcv(br, NULL, skb, vid)) {
94 kfree_skb(skb);
95 goto out;
96 }
97
98 mdst = br_mdb_get(br, skb, vid);
99 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
100 br_multicast_querier_exists(br, eth_hdr(skb)))
101 br_multicast_flood(mdst, skb, false, true);
102 else
103 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
104 } else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
105 br_forward(dst->dst, skb, false, true);
106 } else {
107 br_flood(br, skb, BR_PKT_UNICAST, false, true);
108 }
109out:
110 rcu_read_unlock();
111 return NETDEV_TX_OK;
112}
113
114static void br_set_lockdep_class(struct net_device *dev)
115{
116 lockdep_set_class(&dev->addr_list_lock, &bridge_netdev_addr_lock_key);
117}
118
119static int br_dev_init(struct net_device *dev)
120{
121 struct net_bridge *br = netdev_priv(dev);
122 int err;
123
124 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
125 if (!br->stats)
126 return -ENOMEM;
127
128 err = br_fdb_hash_init(br);
129 if (err) {
130 free_percpu(br->stats);
131 return err;
132 }
133
134 err = br_vlan_init(br);
135 if (err) {
136 free_percpu(br->stats);
137 br_fdb_hash_fini(br);
138 return err;
139 }
140
141 err = br_multicast_init_stats(br);
142 if (err) {
143 free_percpu(br->stats);
144 br_vlan_flush(br);
145 br_fdb_hash_fini(br);
146 }
147 br_set_lockdep_class(dev);
148
149 return err;
150}
151
152static void br_dev_uninit(struct net_device *dev)
153{
154 struct net_bridge *br = netdev_priv(dev);
155
156 br_multicast_dev_del(br);
157 br_multicast_uninit_stats(br);
158 br_vlan_flush(br);
159 br_fdb_hash_fini(br);
160 free_percpu(br->stats);
161}
162
163static int br_dev_open(struct net_device *dev)
164{
165 struct net_bridge *br = netdev_priv(dev);
166
167 netdev_update_features(dev);
168 netif_start_queue(dev);
169 br_stp_enable_bridge(br);
170 br_multicast_open(br);
171
172 return 0;
173}
174
175static void br_dev_set_multicast_list(struct net_device *dev)
176{
177}
178
179static void br_dev_change_rx_flags(struct net_device *dev, int change)
180{
181 if (change & IFF_PROMISC)
182 br_manage_promisc(netdev_priv(dev));
183}
184
185static int br_dev_stop(struct net_device *dev)
186{
187 struct net_bridge *br = netdev_priv(dev);
188
189 br_stp_disable_bridge(br);
190 br_multicast_stop(br);
191
192 netif_stop_queue(dev);
193
194 return 0;
195}
196
197static void br_get_stats64(struct net_device *dev,
198 struct rtnl_link_stats64 *stats)
199{
200 struct net_bridge *br = netdev_priv(dev);
201 struct pcpu_sw_netstats tmp, sum = { 0 };
202 unsigned int cpu;
203
204 for_each_possible_cpu(cpu) {
205 unsigned int start;
206 const struct pcpu_sw_netstats *bstats
207 = per_cpu_ptr(br->stats, cpu);
208 do {
209 start = u64_stats_fetch_begin_irq(&bstats->syncp);
210 memcpy(&tmp, bstats, sizeof(tmp));
211 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
212 sum.tx_bytes += tmp.tx_bytes;
213 sum.tx_packets += tmp.tx_packets;
214 sum.rx_bytes += tmp.rx_bytes;
215 sum.rx_packets += tmp.rx_packets;
216 }
217
218 stats->tx_bytes = sum.tx_bytes;
219 stats->tx_packets = sum.tx_packets;
220 stats->rx_bytes = sum.rx_bytes;
221 stats->rx_packets = sum.rx_packets;
222}
223
224static int br_change_mtu(struct net_device *dev, int new_mtu)
225{
226 struct net_bridge *br = netdev_priv(dev);
227
228 dev->mtu = new_mtu;
229
230 /* this flag will be cleared if the MTU was automatically adjusted */
231 br->mtu_set_by_user = true;
232#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
233 /* remember the MTU in the rtable for PMTU */
234 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
235#endif
236
237 return 0;
238}
239
240/* Allow setting mac address to any valid ethernet address. */
241static int br_set_mac_address(struct net_device *dev, void *p)
242{
243 struct net_bridge *br = netdev_priv(dev);
244 struct sockaddr *addr = p;
245
246 if (!is_valid_ether_addr(addr->sa_data))
247 return -EADDRNOTAVAIL;
248
249 spin_lock_bh(&br->lock);
250 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
251 /* Mac address will be changed in br_stp_change_bridge_id(). */
252 br_stp_change_bridge_id(br, addr->sa_data);
253 }
254 spin_unlock_bh(&br->lock);
255
256 return 0;
257}
258
259static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
260{
261 strlcpy(info->driver, "bridge", sizeof(info->driver));
262 strlcpy(info->version, BR_VERSION, sizeof(info->version));
263 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
264 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
265}
266
267static netdev_features_t br_fix_features(struct net_device *dev,
268 netdev_features_t features)
269{
270 struct net_bridge *br = netdev_priv(dev);
271
272 return br_features_recompute(br, features);
273}
274
275#ifdef CONFIG_NET_POLL_CONTROLLER
276static void br_poll_controller(struct net_device *br_dev)
277{
278}
279
280static void br_netpoll_cleanup(struct net_device *dev)
281{
282 struct net_bridge *br = netdev_priv(dev);
283 struct net_bridge_port *p;
284
285 list_for_each_entry(p, &br->port_list, list)
286 br_netpoll_disable(p);
287}
288
289static int __br_netpoll_enable(struct net_bridge_port *p)
290{
291 struct netpoll *np;
292 int err;
293
294 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
295 if (!np)
296 return -ENOMEM;
297
298 err = __netpoll_setup(np, p->dev);
299 if (err) {
300 kfree(np);
301 return err;
302 }
303
304 p->np = np;
305 return err;
306}
307
308int br_netpoll_enable(struct net_bridge_port *p)
309{
310 if (!p->br->dev->npinfo)
311 return 0;
312
313 return __br_netpoll_enable(p);
314}
315
316static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
317{
318 struct net_bridge *br = netdev_priv(dev);
319 struct net_bridge_port *p;
320 int err = 0;
321
322 list_for_each_entry(p, &br->port_list, list) {
323 if (!p->dev)
324 continue;
325 err = __br_netpoll_enable(p);
326 if (err)
327 goto fail;
328 }
329
330out:
331 return err;
332
333fail:
334 br_netpoll_cleanup(dev);
335 goto out;
336}
337
338void br_netpoll_disable(struct net_bridge_port *p)
339{
340 struct netpoll *np = p->np;
341
342 if (!np)
343 return;
344
345 p->np = NULL;
346
347 __netpoll_free_async(np);
348}
349
350#endif
351
352static int br_add_slave(struct net_device *dev, struct net_device *slave_dev,
353 struct netlink_ext_ack *extack)
354
355{
356 struct net_bridge *br = netdev_priv(dev);
357
358 return br_add_if(br, slave_dev, extack);
359}
360
361static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
362{
363 struct net_bridge *br = netdev_priv(dev);
364
365 return br_del_if(br, slave_dev);
366}
367
368static const struct ethtool_ops br_ethtool_ops = {
369 .get_drvinfo = br_getinfo,
370 .get_link = ethtool_op_get_link,
371};
372
373static const struct net_device_ops br_netdev_ops = {
374 .ndo_open = br_dev_open,
375 .ndo_stop = br_dev_stop,
376 .ndo_init = br_dev_init,
377 .ndo_uninit = br_dev_uninit,
378 .ndo_start_xmit = br_dev_xmit,
379 .ndo_get_stats64 = br_get_stats64,
380 .ndo_set_mac_address = br_set_mac_address,
381 .ndo_set_rx_mode = br_dev_set_multicast_list,
382 .ndo_change_rx_flags = br_dev_change_rx_flags,
383 .ndo_change_mtu = br_change_mtu,
384 .ndo_do_ioctl = br_dev_ioctl,
385#ifdef CONFIG_NET_POLL_CONTROLLER
386 .ndo_netpoll_setup = br_netpoll_setup,
387 .ndo_netpoll_cleanup = br_netpoll_cleanup,
388 .ndo_poll_controller = br_poll_controller,
389#endif
390 .ndo_add_slave = br_add_slave,
391 .ndo_del_slave = br_del_slave,
392 .ndo_fix_features = br_fix_features,
393 .ndo_fdb_add = br_fdb_add,
394 .ndo_fdb_del = br_fdb_delete,
395 .ndo_fdb_dump = br_fdb_dump,
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}