Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Device handling code | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
1da177e4 LT |
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> | |
c06ee961 | 16 | #include <linux/netpoll.h> |
4505a3ef | 17 | #include <linux/etherdevice.h> |
edb5e46f | 18 | #include <linux/ethtool.h> |
c06ee961 | 19 | #include <linux/list.h> |
ea2d9b41 | 20 | #include <linux/netfilter_bridge.h> |
4505a3ef | 21 | |
1da177e4 LT |
22 | #include <asm/uaccess.h> |
23 | #include "br_private.h" | |
24 | ||
161f65ba VY |
25 | #define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \ |
26 | NETIF_F_GSO_MASK | NETIF_F_HW_CSUM) | |
27 | ||
eeaf61d8 | 28 | /* net device transmit always called with BH disabled */ |
6fef4c0c | 29 | netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
30 | { |
31 | struct net_bridge *br = netdev_priv(dev); | |
32 | const unsigned char *dest = skb->data; | |
33 | struct net_bridge_fdb_entry *dst; | |
c4fcb78c | 34 | struct net_bridge_mdb_entry *mdst; |
8f84985f | 35 | struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats); |
78851988 | 36 | u16 vid = 0; |
1da177e4 | 37 | |
c03307ea | 38 | rcu_read_lock(); |
34666d46 | 39 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
ea2d9b41 BDS |
40 | if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) { |
41 | br_nf_pre_routing_finish_bridge_slow(skb); | |
c03307ea | 42 | rcu_read_unlock(); |
ea2d9b41 BDS |
43 | return NETDEV_TX_OK; |
44 | } | |
45 | #endif | |
46 | ||
406818ff | 47 | u64_stats_update_begin(&brstats->syncp); |
14bb4789 | 48 | brstats->tx_packets++; |
49 | brstats->tx_bytes += skb->len; | |
406818ff | 50 | u64_stats_update_end(&brstats->syncp); |
6088a539 | 51 | |
14bb4789 | 52 | BR_INPUT_SKB_CB(skb)->brdev = dev; |
1da177e4 | 53 | |
459a98ed | 54 | skb_reset_mac_header(skb); |
1da177e4 LT |
55 | skb_pull(skb, ETH_HLEN); |
56 | ||
12464bb8 TM |
57 | if (!br_allowed_ingress(br, br_get_vlan_info(br), skb, &vid)) |
58 | goto out; | |
59 | ||
44661462 | 60 | if (is_broadcast_ether_addr(dest)) |
867a5943 | 61 | br_flood_deliver(br, skb, false); |
44661462 | 62 | else if (is_multicast_ether_addr(dest)) { |
91d2c34a | 63 | if (unlikely(netpoll_tx_running(dev))) { |
867a5943 | 64 | br_flood_deliver(br, skb, false); |
91d2c34a HX |
65 | goto out; |
66 | } | |
06499098 | 67 | if (br_multicast_rcv(br, NULL, skb, vid)) { |
6d1d1d39 | 68 | kfree_skb(skb); |
c4fcb78c | 69 | goto out; |
6d1d1d39 | 70 | } |
c4fcb78c | 71 | |
fbca58a2 | 72 | mdst = br_mdb_get(br, skb, vid); |
b00589af | 73 | if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) && |
cc0fdd80 | 74 | br_multicast_querier_exists(br, eth_hdr(skb))) |
c4fcb78c HX |
75 | br_multicast_deliver(mdst, skb); |
76 | else | |
867a5943 | 77 | br_flood_deliver(br, skb, false); |
2ba071ec | 78 | } else if ((dst = __br_fdb_get(br, dest, vid)) != NULL) |
1da177e4 LT |
79 | br_deliver(dst->dst, skb); |
80 | else | |
867a5943 | 81 | br_flood_deliver(br, skb, true); |
1da177e4 | 82 | |
c4fcb78c | 83 | out: |
eeaf61d8 | 84 | rcu_read_unlock(); |
6ed10654 | 85 | return NETDEV_TX_OK; |
1da177e4 LT |
86 | } |
87 | ||
bb900b27 | 88 | static int br_dev_init(struct net_device *dev) |
89 | { | |
90 | struct net_bridge *br = netdev_priv(dev); | |
5be5a2df | 91 | int err; |
bb900b27 | 92 | |
1c213bd2 | 93 | br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
bb900b27 | 94 | if (!br->stats) |
95 | return -ENOMEM; | |
96 | ||
5be5a2df VY |
97 | err = br_vlan_init(br); |
98 | if (err) | |
99 | free_percpu(br->stats); | |
100 | ||
101 | return err; | |
bb900b27 | 102 | } |
103 | ||
1da177e4 LT |
104 | static int br_dev_open(struct net_device *dev) |
105 | { | |
81d35307 | 106 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 | 107 | |
c4d27ef9 | 108 | netdev_update_features(dev); |
81d35307 SH |
109 | netif_start_queue(dev); |
110 | br_stp_enable_bridge(br); | |
3fe2d7c7 | 111 | br_multicast_open(br); |
1da177e4 LT |
112 | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static void br_dev_set_multicast_list(struct net_device *dev) | |
117 | { | |
118 | } | |
119 | ||
2796d0c6 VY |
120 | static void br_dev_change_rx_flags(struct net_device *dev, int change) |
121 | { | |
122 | if (change & IFF_PROMISC) | |
123 | br_manage_promisc(netdev_priv(dev)); | |
124 | } | |
125 | ||
1da177e4 LT |
126 | static int br_dev_stop(struct net_device *dev) |
127 | { | |
3fe2d7c7 HX |
128 | struct net_bridge *br = netdev_priv(dev); |
129 | ||
130 | br_stp_disable_bridge(br); | |
131 | br_multicast_stop(br); | |
1da177e4 LT |
132 | |
133 | netif_stop_queue(dev); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
28172739 ED |
138 | static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev, |
139 | struct rtnl_link_stats64 *stats) | |
14bb4789 | 140 | { |
141 | struct net_bridge *br = netdev_priv(dev); | |
8f84985f | 142 | struct pcpu_sw_netstats tmp, sum = { 0 }; |
14bb4789 | 143 | unsigned int cpu; |
144 | ||
145 | for_each_possible_cpu(cpu) { | |
406818ff | 146 | unsigned int start; |
8f84985f | 147 | const struct pcpu_sw_netstats *bstats |
14bb4789 | 148 | = per_cpu_ptr(br->stats, cpu); |
406818ff | 149 | do { |
57a7744e | 150 | start = u64_stats_fetch_begin_irq(&bstats->syncp); |
406818ff | 151 | memcpy(&tmp, bstats, sizeof(tmp)); |
57a7744e | 152 | } while (u64_stats_fetch_retry_irq(&bstats->syncp, start)); |
406818ff ED |
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; | |
14bb4789 | 157 | } |
158 | ||
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; | |
163 | ||
164 | return stats; | |
165 | } | |
166 | ||
1da177e4 LT |
167 | static int br_change_mtu(struct net_device *dev, int new_mtu) |
168 | { | |
4adf0af6 SW |
169 | struct net_bridge *br = netdev_priv(dev); |
170 | if (new_mtu < 68 || new_mtu > br_min_mtu(br)) | |
1da177e4 LT |
171 | return -EINVAL; |
172 | ||
173 | dev->mtu = new_mtu; | |
4adf0af6 | 174 | |
34666d46 | 175 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
4adf0af6 | 176 | /* remember the MTU in the rtable for PMTU */ |
defb3519 | 177 | dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu); |
4adf0af6 SW |
178 | #endif |
179 | ||
1da177e4 LT |
180 | return 0; |
181 | } | |
182 | ||
ffe1d49c | 183 | /* Allow setting mac address to any valid ethernet address. */ |
4505a3ef SH |
184 | static int br_set_mac_address(struct net_device *dev, void *p) |
185 | { | |
186 | struct net_bridge *br = netdev_priv(dev); | |
187 | struct sockaddr *addr = p; | |
ffe1d49c SH |
188 | |
189 | if (!is_valid_ether_addr(addr->sa_data)) | |
7ca1e11a | 190 | return -EADDRNOTAVAIL; |
4505a3ef SH |
191 | |
192 | spin_lock_bh(&br->lock); | |
9a7b6ef9 | 193 | if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) { |
a3ebb7ef | 194 | /* Mac address will be changed in br_stp_change_bridge_id(). */ |
43598813 | 195 | br_stp_change_bridge_id(br, addr->sa_data); |
196 | } | |
4505a3ef SH |
197 | spin_unlock_bh(&br->lock); |
198 | ||
ffe1d49c | 199 | return 0; |
4505a3ef SH |
200 | } |
201 | ||
edb5e46f SH |
202 | static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
203 | { | |
7826d43f JP |
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)); | |
edb5e46f SH |
208 | } |
209 | ||
c8f44aff MM |
210 | static netdev_features_t br_fix_features(struct net_device *dev, |
211 | netdev_features_t features) | |
edb5e46f SH |
212 | { |
213 | struct net_bridge *br = netdev_priv(dev); | |
214 | ||
c4d27ef9 | 215 | return br_features_recompute(br, features); |
361ff8a6 JG |
216 | } |
217 | ||
c06ee961 | 218 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 219 | static void br_poll_controller(struct net_device *br_dev) |
c06ee961 | 220 | { |
c06ee961 WC |
221 | } |
222 | ||
91d2c34a | 223 | static void br_netpoll_cleanup(struct net_device *dev) |
c06ee961 | 224 | { |
91d2c34a | 225 | struct net_bridge *br = netdev_priv(dev); |
4e3828c4 | 226 | struct net_bridge_port *p; |
c06ee961 | 227 | |
4e3828c4 | 228 | list_for_each_entry(p, &br->port_list, list) |
91d2c34a | 229 | br_netpoll_disable(p); |
c06ee961 WC |
230 | } |
231 | ||
a8779ec1 | 232 | static int __br_netpoll_enable(struct net_bridge_port *p) |
dbe17307 CW |
233 | { |
234 | struct netpoll *np; | |
235 | int err; | |
236 | ||
a8779ec1 | 237 | np = kzalloc(sizeof(*p->np), GFP_KERNEL); |
dbe17307 CW |
238 | if (!np) |
239 | return -ENOMEM; | |
240 | ||
a8779ec1 | 241 | err = __netpoll_setup(np, p->dev); |
dbe17307 CW |
242 | if (err) { |
243 | kfree(np); | |
244 | return err; | |
245 | } | |
246 | ||
247 | p->np = np; | |
248 | return err; | |
249 | } | |
250 | ||
a8779ec1 | 251 | int br_netpoll_enable(struct net_bridge_port *p) |
dbe17307 CW |
252 | { |
253 | if (!p->br->dev->npinfo) | |
254 | return 0; | |
255 | ||
a8779ec1 | 256 | return __br_netpoll_enable(p); |
dbe17307 CW |
257 | } |
258 | ||
a8779ec1 | 259 | static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) |
c06ee961 | 260 | { |
cfb478da | 261 | struct net_bridge *br = netdev_priv(dev); |
4e3828c4 | 262 | struct net_bridge_port *p; |
91d2c34a | 263 | int err = 0; |
c06ee961 | 264 | |
4e3828c4 | 265 | list_for_each_entry(p, &br->port_list, list) { |
91d2c34a HX |
266 | if (!p->dev) |
267 | continue; | |
a8779ec1 | 268 | err = __br_netpoll_enable(p); |
91d2c34a HX |
269 | if (err) |
270 | goto fail; | |
c06ee961 | 271 | } |
91d2c34a HX |
272 | |
273 | out: | |
274 | return err; | |
275 | ||
276 | fail: | |
277 | br_netpoll_cleanup(dev); | |
278 | goto out; | |
c06ee961 WC |
279 | } |
280 | ||
91d2c34a | 281 | void br_netpoll_disable(struct net_bridge_port *p) |
c06ee961 | 282 | { |
91d2c34a HX |
283 | struct netpoll *np = p->np; |
284 | ||
285 | if (!np) | |
286 | return; | |
287 | ||
288 | p->np = NULL; | |
289 | ||
2cde6acd | 290 | __netpoll_free_async(np); |
c06ee961 WC |
291 | } |
292 | ||
293 | #endif | |
294 | ||
afc6151a JP |
295 | static int br_add_slave(struct net_device *dev, struct net_device *slave_dev) |
296 | ||
297 | { | |
298 | struct net_bridge *br = netdev_priv(dev); | |
299 | ||
300 | return br_add_if(br, slave_dev); | |
301 | } | |
302 | ||
303 | static int br_del_slave(struct net_device *dev, struct net_device *slave_dev) | |
304 | { | |
305 | struct net_bridge *br = netdev_priv(dev); | |
306 | ||
307 | return br_del_if(br, slave_dev); | |
308 | } | |
309 | ||
a2dbb882 | 310 | static const struct ethtool_ops br_ethtool_ops = { |
e4119a43 SH |
311 | .get_drvinfo = br_getinfo, |
312 | .get_link = ethtool_op_get_link, | |
edb5e46f SH |
313 | }; |
314 | ||
a2dbb882 SH |
315 | static const struct net_device_ops br_netdev_ops = { |
316 | .ndo_open = br_dev_open, | |
317 | .ndo_stop = br_dev_stop, | |
bb900b27 | 318 | .ndo_init = br_dev_init, |
00829823 | 319 | .ndo_start_xmit = br_dev_xmit, |
406818ff | 320 | .ndo_get_stats64 = br_get_stats64, |
00829823 | 321 | .ndo_set_mac_address = br_set_mac_address, |
afc4b13d | 322 | .ndo_set_rx_mode = br_dev_set_multicast_list, |
2796d0c6 | 323 | .ndo_change_rx_flags = br_dev_change_rx_flags, |
00829823 SH |
324 | .ndo_change_mtu = br_change_mtu, |
325 | .ndo_do_ioctl = br_dev_ioctl, | |
c06ee961 | 326 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 327 | .ndo_netpoll_setup = br_netpoll_setup, |
c06ee961 WC |
328 | .ndo_netpoll_cleanup = br_netpoll_cleanup, |
329 | .ndo_poll_controller = br_poll_controller, | |
330 | #endif | |
afc6151a JP |
331 | .ndo_add_slave = br_add_slave, |
332 | .ndo_del_slave = br_del_slave, | |
c4d27ef9 | 333 | .ndo_fix_features = br_fix_features, |
77162022 JF |
334 | .ndo_fdb_add = br_fdb_add, |
335 | .ndo_fdb_del = br_fdb_delete, | |
336 | .ndo_fdb_dump = br_fdb_dump, | |
e5a55a89 JF |
337 | .ndo_bridge_getlink = br_getlink, |
338 | .ndo_bridge_setlink = br_setlink, | |
407af329 | 339 | .ndo_bridge_dellink = br_dellink, |
a2dbb882 SH |
340 | }; |
341 | ||
14bb4789 | 342 | static void br_dev_free(struct net_device *dev) |
343 | { | |
344 | struct net_bridge *br = netdev_priv(dev); | |
345 | ||
346 | free_percpu(br->stats); | |
347 | free_netdev(dev); | |
348 | } | |
349 | ||
bb900b27 | 350 | static struct device_type br_type = { |
351 | .name = "bridge", | |
352 | }; | |
353 | ||
1da177e4 LT |
354 | void br_dev_setup(struct net_device *dev) |
355 | { | |
bb900b27 | 356 | struct net_bridge *br = netdev_priv(dev); |
357 | ||
7ce5d222 | 358 | eth_hw_addr_random(dev); |
1da177e4 LT |
359 | ether_setup(dev); |
360 | ||
a2dbb882 | 361 | dev->netdev_ops = &br_netdev_ops; |
14bb4789 | 362 | dev->destructor = br_dev_free; |
7ad24ea4 | 363 | dev->ethtool_ops = &br_ethtool_ops; |
bb900b27 | 364 | SET_NETDEV_DEVTYPE(dev, &br_type); |
1da177e4 | 365 | dev->tx_queue_len = 0; |
1da177e4 | 366 | dev->priv_flags = IFF_EBRIDGE; |
edb5e46f | 367 | |
161f65ba | 368 | dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL | |
1c5abb6c TM |
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; | |
161f65ba | 372 | dev->vlan_features = COMMON_FEATURES; |
bb900b27 | 373 | |
374 | br->dev = dev; | |
375 | spin_lock_init(&br->lock); | |
376 | INIT_LIST_HEAD(&br->port_list); | |
377 | spin_lock_init(&br->hash_lock); | |
378 | ||
379 | br->bridge_id.prio[0] = 0x80; | |
380 | br->bridge_id.prio[1] = 0x00; | |
381 | ||
e5a727f6 | 382 | ether_addr_copy(br->group_addr, eth_reserved_addr_base); |
bb900b27 | 383 | |
bb900b27 | 384 | br->stp_enabled = BR_NO_STP; |
515853cc | 385 | br->group_fwd_mask = BR_GROUPFWD_DEFAULT; |
f2808d22 | 386 | br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT; |
515853cc | 387 | |
bb900b27 | 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; | |
393 | ||
394 | br_netfilter_rtable_init(br); | |
395 | br_stp_timer_init(br); | |
396 | br_multicast_init(br); | |
1da177e4 | 397 | } |