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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Userspace interface
3 * Linux ethernet bridge
4 *
5 * Authors:
6 * Lennert Buytenhek <buytenh@gnu.org>
7 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * 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>
stephen hemminger77f98592011-09-30 14:37:26 +000016#include <linux/etherdevice.h>
WANG Congc06ee962010-05-06 00:48:24 -070017#include <linux/netpoll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/ethtool.h>
19#include <linux/if_arp.h>
20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/rtnetlink.h>
Kris Katterjohn46f25df2006-01-05 16:35:42 -080023#include <linux/if_ether.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <net/sock.h>
Vlad Yasevich407af322013-02-13 12:00:12 +000026#include <linux/if_vlan.h>
Jiri Pirko56607382015-10-14 19:40:53 +020027#include <net/switchdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29#include "br_private.h"
30
31/*
32 * Determine initial path cost based on speed.
33 * using recommendations from 802.1d standard
34 *
Matthew Wilcox61a44b92007-07-31 14:00:02 -070035 * Since driver might sleep need to not be holding any locks.
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 */
Stephen Hemminger4433f422005-12-20 15:19:51 -080037static int port_cost(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070038{
David Decotigny702b26a2016-02-24 10:58:09 -080039 struct ethtool_link_ksettings ecmd;
Stephen Hemmingerb4a488d2007-08-30 22:16:22 -070040
David Decotigny702b26a2016-02-24 10:58:09 -080041 if (!__ethtool_get_link_ksettings(dev, &ecmd)) {
42 switch (ecmd.base.speed) {
Jiri Pirkofa3df922011-09-01 03:29:38 +000043 case SPEED_10000:
44 return 2;
45 case SPEED_1000:
46 return 4;
47 case SPEED_100:
48 return 19;
49 case SPEED_10:
50 return 100;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 }
52 }
53
54 /* Old silly heuristics based on name */
55 if (!strncmp(dev->name, "lec", 3))
56 return 7;
57
58 if (!strncmp(dev->name, "plip", 4))
59 return 2500;
60
61 return 100; /* assume old 10Mbps */
62}
63
Stephen Hemminger4433f422005-12-20 15:19:51 -080064
tanxiaojun1a81a2e2013-12-16 21:32:46 +080065/* Check for port carrier transitions. */
Stephen Hemminger269def72007-02-22 01:10:18 -080066void br_port_carrier_check(struct net_bridge_port *p)
Stephen Hemminger4433f422005-12-20 15:19:51 -080067{
Stephen Hemminger269def72007-02-22 01:10:18 -080068 struct net_device *dev = p->dev;
69 struct net_bridge *br = p->br;
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -080070
stephen hemminger8f3359b2013-04-13 14:06:07 +000071 if (!(p->flags & BR_ADMIN_COST) &&
72 netif_running(dev) && netif_oper_up(dev))
Stephen Hemminger6e86b892006-03-03 17:14:51 -080073 p->path_cost = port_cost(dev);
Stephen Hemminger4433f422005-12-20 15:19:51 -080074
stephen hemmingeraa7c6e52010-08-24 13:12:56 +000075 if (!netif_running(br->dev))
76 return;
77
78 spin_lock_bh(&br->lock);
stephen hemminger576eb622012-12-28 18:15:22 +000079 if (netif_running(dev) && netif_oper_up(dev)) {
stephen hemmingeraa7c6e52010-08-24 13:12:56 +000080 if (p->state == BR_STATE_DISABLED)
81 br_stp_enable_port(p);
82 } else {
83 if (p->state != BR_STATE_DISABLED)
84 br_stp_disable_port(p);
Stephen Hemminger4433f422005-12-20 15:19:51 -080085 }
stephen hemmingeraa7c6e52010-08-24 13:12:56 +000086 spin_unlock_bh(&br->lock);
Stephen Hemminger4433f422005-12-20 15:19:51 -080087}
88
Vlad Yasevich2796d0c2014-05-16 09:59:20 -040089static void br_port_set_promisc(struct net_bridge_port *p)
90{
91 int err = 0;
92
93 if (br_promisc_port(p))
94 return;
95
96 err = dev_set_promiscuity(p->dev, 1);
97 if (err)
98 return;
99
100 br_fdb_unsync_static(p->br, p);
101 p->flags |= BR_PROMISC;
102}
103
104static void br_port_clear_promisc(struct net_bridge_port *p)
105{
106 int err;
107
108 /* Check if the port is already non-promisc or if it doesn't
109 * support UNICAST filtering. Without unicast filtering support
110 * we'll end up re-enabling promisc mode anyway, so just check for
111 * it here.
112 */
113 if (!br_promisc_port(p) || !(p->dev->priv_flags & IFF_UNICAST_FLT))
114 return;
115
116 /* Since we'll be clearing the promisc mode, program the port
117 * first so that we don't have interruption in traffic.
118 */
119 err = br_fdb_sync_static(p->br, p);
120 if (err)
121 return;
122
123 dev_set_promiscuity(p->dev, -1);
124 p->flags &= ~BR_PROMISC;
125}
126
127/* When a port is added or removed or when certain port flags
128 * change, this function is called to automatically manage
129 * promiscuity setting of all the bridge ports. We are always called
130 * under RTNL so can skip using rcu primitives.
131 */
132void br_manage_promisc(struct net_bridge *br)
133{
134 struct net_bridge_port *p;
135 bool set_all = false;
136
137 /* If vlan filtering is disabled or bridge interface is placed
138 * into promiscuous mode, place all ports in promiscuous mode.
139 */
140 if ((br->dev->flags & IFF_PROMISC) || !br_vlan_enabled(br))
141 set_all = true;
142
143 list_for_each_entry(p, &br->port_list, list) {
144 if (set_all) {
145 br_port_set_promisc(p);
146 } else {
147 /* If the number of auto-ports is <= 1, then all other
148 * ports will have their output configuration
149 * statically specified through fdbs. Since ingress
150 * on the auto-port becomes forwarding/egress to other
151 * ports and egress configuration is statically known,
152 * we can say that ingress configuration of the
153 * auto-port is also statically known.
154 * This lets us disable promiscuous mode and write
155 * this config to hw.
156 */
Toshiaki Makitae0a47d12014-06-05 20:53:32 +0900157 if (br->auto_cnt == 0 ||
158 (br->auto_cnt == 1 && br_auto_port(p)))
Vlad Yasevich2796d0c2014-05-16 09:59:20 -0400159 br_port_clear_promisc(p);
160 else
161 br_port_set_promisc(p);
162 }
163 }
164}
165
Vlad Yaseviche028e4b2014-05-16 09:59:16 -0400166static void nbp_update_port_count(struct net_bridge *br)
167{
168 struct net_bridge_port *p;
169 u32 cnt = 0;
170
171 list_for_each_entry(p, &br->port_list, list) {
172 if (br_auto_port(p))
173 cnt++;
174 }
Vlad Yasevich2796d0c2014-05-16 09:59:20 -0400175 if (br->auto_cnt != cnt) {
176 br->auto_cnt = cnt;
177 br_manage_promisc(br);
178 }
179}
180
181static void nbp_delete_promisc(struct net_bridge_port *p)
182{
stephen hemminger025559e2014-05-16 20:46:17 -0700183 /* If port is currently promiscuous, unset promiscuity.
Vlad Yasevich2796d0c2014-05-16 09:59:20 -0400184 * Otherwise, it is a static port so remove all addresses
185 * from it.
186 */
187 dev_set_allmulti(p->dev, -1);
188 if (br_promisc_port(p))
189 dev_set_promiscuity(p->dev, -1);
190 else
191 br_fdb_unsync_static(p->br, p);
Vlad Yaseviche028e4b2014-05-16 09:59:16 -0400192}
193
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800194static void release_nbp(struct kobject *kobj)
195{
196 struct net_bridge_port *p
197 = container_of(kobj, struct net_bridge_port, kobj);
198 kfree(p);
199}
200
201static struct kobj_type brport_ktype = {
202#ifdef CONFIG_SYSFS
203 .sysfs_ops = &brport_sysfs_ops,
204#endif
205 .release = release_nbp,
206};
207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208static void destroy_nbp(struct net_bridge_port *p)
209{
210 struct net_device *dev = p->dev;
211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 p->br = NULL;
213 p->dev = NULL;
214 dev_put(dev);
215
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800216 kobject_put(&p->kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217}
218
219static void destroy_nbp_rcu(struct rcu_head *head)
220{
221 struct net_bridge_port *p =
222 container_of(head, struct net_bridge_port, rcu);
223 destroy_nbp(p);
224}
225
Paolo Abeni45493d42016-02-26 10:45:38 +0100226static unsigned get_max_headroom(struct net_bridge *br)
227{
228 unsigned max_headroom = 0;
229 struct net_bridge_port *p;
230
231 list_for_each_entry(p, &br->port_list, list) {
232 unsigned dev_headroom = netdev_get_fwd_headroom(p->dev);
233
234 if (dev_headroom > max_headroom)
235 max_headroom = dev_headroom;
236 }
237
238 return max_headroom;
239}
240
241static void update_headroom(struct net_bridge *br, int new_hr)
242{
243 struct net_bridge_port *p;
244
245 list_for_each_entry(p, &br->port_list, list)
246 netdev_set_rx_headroom(p->dev, new_hr);
247
248 br->dev->needed_headroom = new_hr;
249}
250
Stephen Hemminger3f4cfc22006-01-31 17:44:07 -0800251/* Delete port(interface) from bridge is done in two steps.
252 * via RCU. First step, marks device as down. That deletes
253 * all the timers and stops new packets from flowing through.
254 *
255 * Final cleanup doesn't occur until after all CPU's finished
256 * processing packets.
257 *
258 * Protected from multiple admin operations by RTNL mutex
259 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260static void del_nbp(struct net_bridge_port *p)
261{
262 struct net_bridge *br = p->br;
263 struct net_device *dev = p->dev;
264
Randy Dunlapb3bcb722010-05-18 12:26:27 -0700265 sysfs_remove_link(br->ifobj, p->dev->name);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800266
Vlad Yasevich2796d0c2014-05-16 09:59:20 -0400267 nbp_delete_promisc(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269 spin_lock_bh(&br->lock);
270 br_stp_disable_port(p);
271 spin_unlock_bh(&br->lock);
272
Stephen Hemmingerb86c4502007-03-22 14:08:46 -0700273 br_ifinfo_notify(RTM_DELLINK, p);
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 list_del_rcu(&p->list);
Paolo Abeni45493d42016-02-26 10:45:38 +0100276 if (netdev_get_fwd_headroom(dev) == br->dev->needed_headroom)
277 update_headroom(br, get_max_headroom(br));
278 netdev_reset_rx_headroom(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Nikolay Aleksandrovf409d0e2015-10-12 21:47:05 +0200280 nbp_vlan_flush(p);
Nikolay Aleksandrov1ea2d022015-06-23 05:28:16 -0700281 br_fdb_delete_by_port(br, p, 0, 1);
Jiri Pirko56607382015-10-14 19:40:53 +0200282 switchdev_deferred_process();
283
Vlad Yaseviche028e4b2014-05-16 09:59:16 -0400284 nbp_update_port_count(br);
285
Jiri Pirko0f495792014-09-05 15:51:28 +0200286 netdev_upper_dev_unlink(dev, br->dev);
287
Jiri Pirkof350a0a82010-06-15 06:50:45 +0000288 dev->priv_flags &= ~IFF_BRIDGE_PORT;
289
Jiri Pirkoab95bfe2010-06-01 21:52:08 +0000290 netdev_rx_handler_unregister(dev);
Stephen Hemmingerb3f1be42006-02-09 17:08:52 -0800291
Herbert Xu3fe2d7c2010-02-28 00:49:38 -0800292 br_multicast_del_port(p);
293
Stephen Hemminger125a12c2006-03-03 17:16:15 -0800294 kobject_uevent(&p->kobj, KOBJ_REMOVE);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800295 kobject_del(&p->kobj);
296
Herbert Xu91d2c342010-06-10 16:12:50 +0000297 br_netpoll_disable(p);
298
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 call_rcu(&p->rcu, destroy_nbp_rcu);
300}
301
stephen hemminger1ce5cce2011-10-06 11:19:41 +0000302/* Delete bridge device */
303void br_dev_delete(struct net_device *dev, struct list_head *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304{
stephen hemminger1ce5cce2011-10-06 11:19:41 +0000305 struct net_bridge *br = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 struct net_bridge_port *p, *n;
307
308 list_for_each_entry_safe(p, n, &br->port_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 del_nbp(p);
310 }
311
Nikolay Aleksandrov1ea2d022015-06-23 05:28:16 -0700312 br_fdb_delete_by_port(br, NULL, 0, 1);
Ding Tianhongf8730422013-12-07 22:12:05 +0800313
Toshiaki Makitab4e09b22013-11-13 17:26:14 +0900314 br_vlan_flush(br);
Satish Ashoke10177a2015-07-15 07:16:51 -0700315 br_multicast_dev_del(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 del_timer_sync(&br->gc_timer);
317
318 br_sysfs_delbr(br->dev);
Eric Dumazet8c56ba02009-10-28 05:35:35 +0000319 unregister_netdevice_queue(br->dev, head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320}
321
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322/* find an available port number */
323static int find_portno(struct net_bridge *br)
324{
325 int index;
326 struct net_bridge_port *p;
327 unsigned long *inuse;
328
Stephen Hemminger3b781fa2006-03-20 22:56:50 -0800329 inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 GFP_KERNEL);
331 if (!inuse)
332 return -ENOMEM;
333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 set_bit(0, inuse); /* zero is reserved */
335 list_for_each_entry(p, &br->port_list, list) {
336 set_bit(p->port_no, inuse);
337 }
338 index = find_first_zero_bit(inuse, BR_MAX_PORTS);
339 kfree(inuse);
340
341 return (index >= BR_MAX_PORTS) ? -EXFULL : index;
342}
343
Stephen Hemminger4433f422005-12-20 15:19:51 -0800344/* called with RTNL but without bridge lock */
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900345static struct net_bridge_port *new_nbp(struct net_bridge *br,
Stephen Hemminger4433f422005-12-20 15:19:51 -0800346 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 struct net_bridge_port *p;
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200349 int index, err;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 index = find_portno(br);
352 if (index < 0)
353 return ERR_PTR(index);
354
Stephen Hemmingercee48542006-03-20 22:57:03 -0800355 p = kzalloc(sizeof(*p), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 if (p == NULL)
357 return ERR_PTR(-ENOMEM);
358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 p->br = br;
360 dev_hold(dev);
361 p->dev = dev;
Stephen Hemminger4433f422005-12-20 15:19:51 -0800362 p->path_cost = port_cost(dev);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900363 p->priority = 0x8000 >> BR_PORT_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 p->port_no = index;
Nikolay Aleksandrovb6cb5ac2016-08-31 15:36:52 +0200365 p->flags = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 br_init_port(p);
Florian Fainelli775dd692014-09-30 16:13:19 -0700367 br_set_state(p, BR_STATE_DISABLED);
Stephen Hemmingerd32439c2006-03-03 17:15:34 -0800368 br_stp_port_timer_init(p);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200369 err = br_multicast_add_port(p);
370 if (err) {
371 dev_put(dev);
372 kfree(p);
373 p = ERR_PTR(err);
374 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
376 return p;
377}
378
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700379int br_add_bridge(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380{
381 struct net_device *dev;
Eric Dumazet11f3a6b2011-08-22 06:05:59 +0000382 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Tom Gundersenc835a672014-07-14 16:37:24 +0200384 dev = alloc_netdev(sizeof(struct net_bridge), name, NET_NAME_UNKNOWN,
stephen hemmingerbb900b22011-04-04 14:03:32 +0000385 br_dev_setup);
386
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900387 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 return -ENOMEM;
389
stephen hemmingerbb900b22011-04-04 14:03:32 +0000390 dev_net_set(dev, net);
stephen hemminger149ddd82012-06-26 05:48:45 +0000391 dev->rtnl_link_ops = &br_link_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Eric Dumazet11f3a6b2011-08-22 06:05:59 +0000393 res = register_netdev(dev);
394 if (res)
395 free_netdev(dev);
396 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397}
398
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700399int br_del_bridge(struct net *net, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400{
401 struct net_device *dev;
402 int ret = 0;
403
404 rtnl_lock();
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700405 dev = __dev_get_by_name(net, name);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900406 if (dev == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 ret = -ENXIO; /* Could not find device */
408
409 else if (!(dev->priv_flags & IFF_EBRIDGE)) {
410 /* Attempt to delete non bridge device! */
411 ret = -EPERM;
412 }
413
414 else if (dev->flags & IFF_UP) {
415 /* Not shutdown yet. */
416 ret = -EBUSY;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900417 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900419 else
stephen hemminger1ce5cce2011-10-06 11:19:41 +0000420 br_dev_delete(dev, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
422 rtnl_unlock();
423 return ret;
424}
425
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800426/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427int br_min_mtu(const struct net_bridge *br)
428{
429 const struct net_bridge_port *p;
430 int mtu = 0;
431
432 ASSERT_RTNL();
433
434 if (list_empty(&br->port_list))
Kris Katterjohn46f25df2006-01-05 16:35:42 -0800435 mtu = ETH_DATA_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 else {
437 list_for_each_entry(p, &br->port_list, list) {
438 if (!mtu || p->dev->mtu < mtu)
439 mtu = p->dev->mtu;
440 }
441 }
442 return mtu;
443}
444
Eric Dumazetae74f102016-03-21 09:55:11 -0700445static void br_set_gso_limits(struct net_bridge *br)
446{
447 unsigned int gso_max_size = GSO_MAX_SIZE;
448 u16 gso_max_segs = GSO_MAX_SEGS;
449 const struct net_bridge_port *p;
450
451 list_for_each_entry(p, &br->port_list, list) {
452 gso_max_size = min(gso_max_size, p->dev->gso_max_size);
453 gso_max_segs = min(gso_max_segs, p->dev->gso_max_segs);
454 }
455 br->dev->gso_max_size = gso_max_size;
456 br->dev->gso_max_segs = gso_max_segs;
457}
458
Stephen Hemminger81d35302005-05-29 14:15:17 -0700459/*
460 * Recomputes features using slave's features
461 */
Michał Mirosławc8f44af2011-11-15 15:29:55 +0000462netdev_features_t br_features_recompute(struct net_bridge *br,
463 netdev_features_t features)
Stephen Hemminger81d35302005-05-29 14:15:17 -0700464{
465 struct net_bridge_port *p;
Michał Mirosławc8f44af2011-11-15 15:29:55 +0000466 netdev_features_t mask;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700467
Herbert Xub63365a2008-10-23 01:11:29 -0700468 if (list_empty(&br->port_list))
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000469 return features;
Herbert Xub63365a2008-10-23 01:11:29 -0700470
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000471 mask = features;
Herbert Xub63365a2008-10-23 01:11:29 -0700472 features &= ~NETIF_F_ONE_FOR_ALL;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700473
474 list_for_each_entry(p, &br->port_list, list) {
Herbert Xub63365a2008-10-23 01:11:29 -0700475 features = netdev_increment_features(features,
476 p->dev->features, mask);
Stephen Hemminger81d35302005-05-29 14:15:17 -0700477 }
Toshiaki Makitaf902e882015-01-09 14:16:40 +0900478 features = netdev_add_tso_features(features, mask);
Stephen Hemminger81d35302005-05-29 14:15:17 -0700479
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000480 return features;
Stephen Hemminger81d35302005-05-29 14:15:17 -0700481}
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483/* called with RTNL */
484int br_add_if(struct net_bridge *br, struct net_device *dev)
485{
486 struct net_bridge_port *p;
487 int err = 0;
Paolo Abeni45493d42016-02-26 10:45:38 +0100488 unsigned br_hr, dev_hr;
stephen hemmingeredf947f2011-03-24 13:24:01 +0000489 bool changed_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
Florian Fainelli8db0a2e2015-01-16 09:56:02 -0800491 /* Don't allow bridging non-ethernet like devices, or DSA-enabled
492 * master network devices since the bridge layer rx_handler prevents
493 * the DSA fake ethertype handler to be invoked, so we do not strip off
494 * the DSA switch tag protocol header and the bridge layer just return
495 * RX_HANDLER_CONSUMED, stopping RX processing for these frames.
496 */
Stephen Hemminger1056bd52009-11-05 20:46:52 -0800497 if ((dev->flags & IFF_LOOPBACK) ||
stephen hemminger77f98592011-09-30 14:37:26 +0000498 dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN ||
Florian Fainelli8db0a2e2015-01-16 09:56:02 -0800499 !is_valid_ether_addr(dev->dev_addr) ||
500 netdev_uses_dsa(dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 return -EINVAL;
502
Stephen Hemminger1056bd52009-11-05 20:46:52 -0800503 /* No bridging of bridges */
Stephen Hemminger00829822008-11-20 20:14:53 -0800504 if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 return -ELOOP;
506
Stephen Hemminger1056bd52009-11-05 20:46:52 -0800507 /* Device is already being bridged */
Jiri Pirkof350a0a82010-06-15 06:50:45 +0000508 if (br_port_exists(dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 return -EBUSY;
510
Johannes Bergad4bb6f2009-11-19 00:56:30 +0100511 /* No bridging devices that dislike that (e.g. wireless) */
512 if (dev->priv_flags & IFF_DONT_BRIDGE)
513 return -EOPNOTSUPP;
514
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800515 p = new_nbp(br, dev);
516 if (IS_ERR(p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 return PTR_ERR(p);
518
Amerigo Wangbb8ed632011-05-19 21:39:11 +0000519 call_netdevice_notifiers(NETDEV_JOIN, dev);
520
Vlad Yasevich2796d0c2014-05-16 09:59:20 -0400521 err = dev_set_allmulti(dev, 1);
Wang Chenbc3f9072008-07-14 20:53:13 -0700522 if (err)
523 goto put_back;
524
Greg Kroah-Hartmane32cc732007-12-17 23:05:35 -0700525 err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
526 SYSFS_BRIDGE_PORT_ATTR);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800527 if (err)
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800528 goto err1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800530 err = br_sysfs_addif(p);
531 if (err)
532 goto err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Eric W. Biedermana8779ec2014-03-27 15:36:38 -0700534 err = br_netpoll_enable(p);
stephen hemminger93d8bf92013-07-24 11:51:41 -0700535 if (err)
Herbert Xu91d2c342010-06-10 16:12:50 +0000536 goto err3;
537
Jiri Pirko0f495792014-09-05 15:51:28 +0200538 err = netdev_rx_handler_register(dev, br_handle_frame, p);
Jiri Pirkoab95bfe2010-06-01 21:52:08 +0000539 if (err)
Gao feng9b1536c2012-12-19 23:41:43 +0000540 goto err4;
Jiri Pirkof350a0a82010-06-15 06:50:45 +0000541
Jiri Pirko0f495792014-09-05 15:51:28 +0200542 dev->priv_flags |= IFF_BRIDGE_PORT;
543
Jiri Pirko29bf24a2015-12-03 12:12:11 +0100544 err = netdev_master_upper_dev_link(dev, br->dev, NULL, NULL);
Jiri Pirkoafc61512011-02-13 09:33:42 +0000545 if (err)
Gao feng9b1536c2012-12-19 23:41:43 +0000546 goto err5;
Jiri Pirkoafc61512011-02-13 09:33:42 +0000547
Ido Schimmel6bc506b2016-08-25 18:42:37 +0200548 err = nbp_switchdev_mark_set(p);
549 if (err)
550 goto err6;
551
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700552 dev_disable_lro(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800554 list_add_rcu(&p->list, &br->port_list);
555
Vlad Yaseviche028e4b2014-05-16 09:59:16 -0400556 nbp_update_port_count(br);
557
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000558 netdev_update_features(br->dev);
559
Paolo Abeni45493d42016-02-26 10:45:38 +0100560 br_hr = br->dev->needed_headroom;
561 dev_hr = netdev_get_fwd_headroom(dev);
562 if (br_hr < dev_hr)
563 update_headroom(br, dev_hr);
564 else
565 netdev_set_rx_headroom(dev, br_hr);
Florian Fainellifd094802013-08-27 12:03:53 +0100566
Toshiaki Makitaa4b816d2014-02-07 16:48:21 +0900567 if (br_fdb_insert(br, p, dev->dev_addr, 0))
568 netdev_err(dev, "failed insert local address bridge forwarding table\n");
569
Elad Raz08474cc2016-01-06 13:01:04 +0100570 err = nbp_vlan_init(p);
571 if (err) {
Vlad Yasevich5be5a2d2014-10-03 11:29:18 -0400572 netdev_err(dev, "failed to initialize vlan filtering on this port\n");
Ido Schimmel6bc506b2016-08-25 18:42:37 +0200573 goto err7;
Elad Raz08474cc2016-01-06 13:01:04 +0100574 }
Vlad Yasevich5be5a2d2014-10-03 11:29:18 -0400575
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800576 spin_lock_bh(&br->lock);
stephen hemmingeredf947f2011-03-24 13:24:01 +0000577 changed_addr = br_stp_recalculate_bridge_id(br);
Aji Srinivasde790592007-03-07 16:10:53 -0800578
stephen hemminger576eb622012-12-28 18:15:22 +0000579 if (netif_running(dev) && netif_oper_up(dev) &&
Aji Srinivasde790592007-03-07 16:10:53 -0800580 (br->dev->flags & IFF_UP))
581 br_stp_enable_port(p);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800582 spin_unlock_bh(&br->lock);
583
Stephen Hemmingerb86c4502007-03-22 14:08:46 -0700584 br_ifinfo_notify(RTM_NEWLINK, p);
585
stephen hemmingeredf947f2011-03-24 13:24:01 +0000586 if (changed_addr)
stephen hemminger56139fc2011-07-22 07:47:08 +0000587 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
stephen hemmingeredf947f2011-03-24 13:24:01 +0000588
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800589 dev_set_mtu(br->dev, br_min_mtu(br));
Eric Dumazetae74f102016-03-21 09:55:11 -0700590 br_set_gso_limits(br);
Stephen Hemminger269def72007-02-22 01:10:18 -0800591
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800592 kobject_uevent(&p->kobj, KOBJ_ADD);
593
594 return 0;
Jiri Pirkoafc61512011-02-13 09:33:42 +0000595
Ido Schimmel6bc506b2016-08-25 18:42:37 +0200596err7:
Elad Raz08474cc2016-01-06 13:01:04 +0100597 list_del_rcu(&p->list);
598 br_fdb_delete_by_port(br, p, 0, 1);
599 nbp_update_port_count(br);
Ido Schimmel6bc506b2016-08-25 18:42:37 +0200600err6:
Elad Raz08474cc2016-01-06 13:01:04 +0100601 netdev_upper_dev_unlink(dev, br->dev);
Gao feng9b1536c2012-12-19 23:41:43 +0000602err5:
Jiri Pirko0f495792014-09-05 15:51:28 +0200603 dev->priv_flags &= ~IFF_BRIDGE_PORT;
604 netdev_rx_handler_unregister(dev);
Gao feng9b1536c2012-12-19 23:41:43 +0000605err4:
606 br_netpoll_disable(p);
Herbert Xu91d2c342010-06-10 16:12:50 +0000607err3:
608 sysfs_remove_link(br->ifobj, p->dev->name);
Stephen Hemmingerbab1dee2006-02-09 17:10:12 -0800609err2:
Xiaotian Fengc587aea2009-07-23 23:06:32 +0000610 kobject_put(&p->kobj);
Jeff Hansen30df94f2009-09-28 12:54:25 -0700611 p = NULL; /* kobject_put frees */
stephen hemminger77f98592011-09-30 14:37:26 +0000612err1:
wangweidong019ee792014-05-29 10:15:30 +0800613 dev_set_allmulti(dev, -1);
Volodymyr G Lukiianyk43af8532008-04-29 03:17:42 -0700614put_back:
615 dev_put(dev);
Wang Chenbc3f9072008-07-14 20:53:13 -0700616 kfree(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 return err;
618}
619
620/* called with RTNL */
621int br_del_if(struct net_bridge *br, struct net_device *dev)
622{
Jiri Pirkof350a0a82010-06-15 06:50:45 +0000623 struct net_bridge_port *p;
Andrei Warkentin9be6dd62011-08-05 11:04:10 +0000624 bool changed_addr;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900625
Eric Dumazetec1e5612010-11-15 06:38:14 +0000626 p = br_port_get_rtnl(dev);
stephen hemmingerb5ed54e2010-11-15 06:38:13 +0000627 if (!p || p->br != br)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 return -EINVAL;
629
Amerigo Wangd30362c2012-08-10 01:24:43 +0000630 /* Since more than one interface can be attached to a bridge,
631 * there still maybe an alternate path for netconsole to use;
632 * therefore there is no reason for a NETDEV_RELEASE event.
633 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 del_nbp(p);
635
Venkat Venkatsubra4c906c22015-03-13 07:08:22 -0700636 dev_set_mtu(br->dev, br_min_mtu(br));
Eric Dumazetae74f102016-03-21 09:55:11 -0700637 br_set_gso_limits(br);
Venkat Venkatsubra4c906c22015-03-13 07:08:22 -0700638
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 spin_lock_bh(&br->lock);
Andrei Warkentin9be6dd62011-08-05 11:04:10 +0000640 changed_addr = br_stp_recalculate_bridge_id(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 spin_unlock_bh(&br->lock);
642
Andrei Warkentin9be6dd62011-08-05 11:04:10 +0000643 if (changed_addr)
644 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
645
Michał Mirosławc4d27ef2011-04-22 06:31:16 +0000646 netdev_update_features(br->dev);
647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 return 0;
649}
Vlad Yaseviche028e4b2014-05-16 09:59:16 -0400650
651void br_port_flags_change(struct net_bridge_port *p, unsigned long mask)
652{
653 struct net_bridge *br = p->br;
654
655 if (mask & BR_AUTO_MASK)
656 nbp_update_port_count(br);
657}