Commit | Line | Data |
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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 | ||
eeaf61d8 | 25 | /* net device transmit always called with BH disabled */ |
6fef4c0c | 26 | netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
27 | { |
28 | struct net_bridge *br = netdev_priv(dev); | |
29 | const unsigned char *dest = skb->data; | |
30 | struct net_bridge_fdb_entry *dst; | |
c4fcb78c | 31 | struct net_bridge_mdb_entry *mdst; |
14bb4789 | 32 | struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats); |
1da177e4 | 33 | |
ea2d9b41 BDS |
34 | #ifdef CONFIG_BRIDGE_NETFILTER |
35 | if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) { | |
36 | br_nf_pre_routing_finish_bridge_slow(skb); | |
37 | return NETDEV_TX_OK; | |
38 | } | |
39 | #endif | |
40 | ||
406818ff | 41 | u64_stats_update_begin(&brstats->syncp); |
14bb4789 | 42 | brstats->tx_packets++; |
43 | brstats->tx_bytes += skb->len; | |
406818ff | 44 | u64_stats_update_end(&brstats->syncp); |
6088a539 | 45 | |
14bb4789 | 46 | BR_INPUT_SKB_CB(skb)->brdev = dev; |
1da177e4 | 47 | |
459a98ed | 48 | skb_reset_mac_header(skb); |
1da177e4 LT |
49 | skb_pull(skb, ETH_HLEN); |
50 | ||
eeaf61d8 | 51 | rcu_read_lock(); |
7180f775 | 52 | if (is_multicast_ether_addr(dest)) { |
91d2c34a HX |
53 | if (unlikely(netpoll_tx_running(dev))) { |
54 | br_flood_deliver(br, skb); | |
55 | goto out; | |
56 | } | |
6d1d1d39 HX |
57 | if (br_multicast_rcv(br, NULL, skb)) { |
58 | kfree_skb(skb); | |
c4fcb78c | 59 | goto out; |
6d1d1d39 | 60 | } |
c4fcb78c HX |
61 | |
62 | mdst = br_mdb_get(br, skb); | |
32dec5dd | 63 | if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) |
c4fcb78c HX |
64 | br_multicast_deliver(mdst, skb); |
65 | else | |
66 | br_flood_deliver(br, skb); | |
67 | } else if ((dst = __br_fdb_get(br, dest)) != NULL) | |
1da177e4 LT |
68 | br_deliver(dst->dst, skb); |
69 | else | |
e081e1e3 | 70 | br_flood_deliver(br, skb); |
1da177e4 | 71 | |
c4fcb78c | 72 | out: |
eeaf61d8 | 73 | rcu_read_unlock(); |
6ed10654 | 74 | return NETDEV_TX_OK; |
1da177e4 LT |
75 | } |
76 | ||
77 | static int br_dev_open(struct net_device *dev) | |
78 | { | |
81d35307 | 79 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 | 80 | |
81d35307 SH |
81 | br_features_recompute(br); |
82 | netif_start_queue(dev); | |
83 | br_stp_enable_bridge(br); | |
3fe2d7c7 | 84 | br_multicast_open(br); |
1da177e4 LT |
85 | |
86 | return 0; | |
87 | } | |
88 | ||
89 | static void br_dev_set_multicast_list(struct net_device *dev) | |
90 | { | |
91 | } | |
92 | ||
93 | static int br_dev_stop(struct net_device *dev) | |
94 | { | |
3fe2d7c7 HX |
95 | struct net_bridge *br = netdev_priv(dev); |
96 | ||
97 | br_stp_disable_bridge(br); | |
98 | br_multicast_stop(br); | |
1da177e4 LT |
99 | |
100 | netif_stop_queue(dev); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
28172739 ED |
105 | static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev, |
106 | struct rtnl_link_stats64 *stats) | |
14bb4789 | 107 | { |
108 | struct net_bridge *br = netdev_priv(dev); | |
406818ff | 109 | struct br_cpu_netstats tmp, sum = { 0 }; |
14bb4789 | 110 | unsigned int cpu; |
111 | ||
112 | for_each_possible_cpu(cpu) { | |
406818ff | 113 | unsigned int start; |
14bb4789 | 114 | const struct br_cpu_netstats *bstats |
115 | = per_cpu_ptr(br->stats, cpu); | |
406818ff ED |
116 | do { |
117 | start = u64_stats_fetch_begin(&bstats->syncp); | |
118 | memcpy(&tmp, bstats, sizeof(tmp)); | |
119 | } while (u64_stats_fetch_retry(&bstats->syncp, start)); | |
120 | sum.tx_bytes += tmp.tx_bytes; | |
121 | sum.tx_packets += tmp.tx_packets; | |
122 | sum.rx_bytes += tmp.rx_bytes; | |
123 | sum.rx_packets += tmp.rx_packets; | |
14bb4789 | 124 | } |
125 | ||
126 | stats->tx_bytes = sum.tx_bytes; | |
127 | stats->tx_packets = sum.tx_packets; | |
128 | stats->rx_bytes = sum.rx_bytes; | |
129 | stats->rx_packets = sum.rx_packets; | |
130 | ||
131 | return stats; | |
132 | } | |
133 | ||
1da177e4 LT |
134 | static int br_change_mtu(struct net_device *dev, int new_mtu) |
135 | { | |
4adf0af6 SW |
136 | struct net_bridge *br = netdev_priv(dev); |
137 | if (new_mtu < 68 || new_mtu > br_min_mtu(br)) | |
1da177e4 LT |
138 | return -EINVAL; |
139 | ||
140 | dev->mtu = new_mtu; | |
4adf0af6 SW |
141 | |
142 | #ifdef CONFIG_BRIDGE_NETFILTER | |
143 | /* remember the MTU in the rtable for PMTU */ | |
d8d1f30b | 144 | br->fake_rtable.dst.metrics[RTAX_MTU - 1] = new_mtu; |
4adf0af6 SW |
145 | #endif |
146 | ||
1da177e4 LT |
147 | return 0; |
148 | } | |
149 | ||
ffe1d49c | 150 | /* Allow setting mac address to any valid ethernet address. */ |
4505a3ef SH |
151 | static int br_set_mac_address(struct net_device *dev, void *p) |
152 | { | |
153 | struct net_bridge *br = netdev_priv(dev); | |
154 | struct sockaddr *addr = p; | |
ffe1d49c SH |
155 | |
156 | if (!is_valid_ether_addr(addr->sa_data)) | |
157 | return -EINVAL; | |
4505a3ef SH |
158 | |
159 | spin_lock_bh(&br->lock); | |
ffe1d49c SH |
160 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); |
161 | br_stp_change_bridge_id(br, addr->sa_data); | |
92c0574f | 162 | br->flags |= BR_SET_MAC_ADDR; |
4505a3ef SH |
163 | spin_unlock_bh(&br->lock); |
164 | ||
ffe1d49c | 165 | return 0; |
4505a3ef SH |
166 | } |
167 | ||
edb5e46f SH |
168 | static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
169 | { | |
170 | strcpy(info->driver, "bridge"); | |
171 | strcpy(info->version, BR_VERSION); | |
172 | strcpy(info->fw_version, "N/A"); | |
173 | strcpy(info->bus_info, "N/A"); | |
174 | } | |
175 | ||
176 | static int br_set_sg(struct net_device *dev, u32 data) | |
177 | { | |
178 | struct net_bridge *br = netdev_priv(dev); | |
179 | ||
180 | if (data) | |
181 | br->feature_mask |= NETIF_F_SG; | |
182 | else | |
183 | br->feature_mask &= ~NETIF_F_SG; | |
184 | ||
185 | br_features_recompute(br); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static int br_set_tso(struct net_device *dev, u32 data) | |
190 | { | |
191 | struct net_bridge *br = netdev_priv(dev); | |
192 | ||
193 | if (data) | |
194 | br->feature_mask |= NETIF_F_TSO; | |
195 | else | |
196 | br->feature_mask &= ~NETIF_F_TSO; | |
197 | ||
198 | br_features_recompute(br); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static int br_set_tx_csum(struct net_device *dev, u32 data) | |
203 | { | |
204 | struct net_bridge *br = netdev_priv(dev); | |
205 | ||
206 | if (data) | |
2c6cc0d8 | 207 | br->feature_mask |= NETIF_F_NO_CSUM; |
edb5e46f | 208 | else |
2c6cc0d8 | 209 | br->feature_mask &= ~NETIF_F_ALL_CSUM; |
edb5e46f SH |
210 | |
211 | br_features_recompute(br); | |
212 | return 0; | |
213 | } | |
214 | ||
c06ee961 | 215 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 216 | static void br_poll_controller(struct net_device *br_dev) |
c06ee961 | 217 | { |
c06ee961 WC |
218 | } |
219 | ||
91d2c34a | 220 | static void br_netpoll_cleanup(struct net_device *dev) |
c06ee961 | 221 | { |
91d2c34a HX |
222 | struct net_bridge *br = netdev_priv(dev); |
223 | struct net_bridge_port *p, *n; | |
c06ee961 | 224 | |
91d2c34a HX |
225 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
226 | br_netpoll_disable(p); | |
227 | } | |
c06ee961 WC |
228 | } |
229 | ||
91d2c34a | 230 | static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) |
c06ee961 | 231 | { |
cfb478da | 232 | struct net_bridge *br = netdev_priv(dev); |
c06ee961 | 233 | struct net_bridge_port *p, *n; |
91d2c34a | 234 | int err = 0; |
c06ee961 | 235 | |
c06ee961 | 236 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
91d2c34a HX |
237 | if (!p->dev) |
238 | continue; | |
239 | ||
240 | err = br_netpoll_enable(p); | |
241 | if (err) | |
242 | goto fail; | |
c06ee961 | 243 | } |
91d2c34a HX |
244 | |
245 | out: | |
246 | return err; | |
247 | ||
248 | fail: | |
249 | br_netpoll_cleanup(dev); | |
250 | goto out; | |
c06ee961 WC |
251 | } |
252 | ||
91d2c34a | 253 | int br_netpoll_enable(struct net_bridge_port *p) |
cfb478da | 254 | { |
91d2c34a HX |
255 | struct netpoll *np; |
256 | int err = 0; | |
257 | ||
258 | np = kzalloc(sizeof(*p->np), GFP_KERNEL); | |
259 | err = -ENOMEM; | |
260 | if (!np) | |
261 | goto out; | |
262 | ||
263 | np->dev = p->dev; | |
264 | ||
265 | err = __netpoll_setup(np); | |
266 | if (err) { | |
267 | kfree(np); | |
268 | goto out; | |
269 | } | |
270 | ||
271 | p->np = np; | |
272 | ||
273 | out: | |
274 | return err; | |
cfb478da | 275 | } |
c06ee961 | 276 | |
91d2c34a | 277 | void br_netpoll_disable(struct net_bridge_port *p) |
c06ee961 | 278 | { |
91d2c34a HX |
279 | struct netpoll *np = p->np; |
280 | ||
281 | if (!np) | |
282 | return; | |
283 | ||
284 | p->np = NULL; | |
285 | ||
286 | /* Wait for transmitting packets to finish before freeing. */ | |
287 | synchronize_rcu_bh(); | |
288 | ||
289 | __netpoll_cleanup(np); | |
290 | kfree(np); | |
c06ee961 WC |
291 | } |
292 | ||
293 | #endif | |
294 | ||
a2dbb882 | 295 | static const struct ethtool_ops br_ethtool_ops = { |
e4119a43 SH |
296 | .get_drvinfo = br_getinfo, |
297 | .get_link = ethtool_op_get_link, | |
298 | .get_tx_csum = ethtool_op_get_tx_csum, | |
299 | .set_tx_csum = br_set_tx_csum, | |
300 | .get_sg = ethtool_op_get_sg, | |
301 | .set_sg = br_set_sg, | |
302 | .get_tso = ethtool_op_get_tso, | |
303 | .set_tso = br_set_tso, | |
304 | .get_ufo = ethtool_op_get_ufo, | |
72dad218 | 305 | .set_ufo = ethtool_op_set_ufo, |
e4119a43 | 306 | .get_flags = ethtool_op_get_flags, |
edb5e46f SH |
307 | }; |
308 | ||
a2dbb882 SH |
309 | static const struct net_device_ops br_netdev_ops = { |
310 | .ndo_open = br_dev_open, | |
311 | .ndo_stop = br_dev_stop, | |
00829823 | 312 | .ndo_start_xmit = br_dev_xmit, |
406818ff | 313 | .ndo_get_stats64 = br_get_stats64, |
00829823 SH |
314 | .ndo_set_mac_address = br_set_mac_address, |
315 | .ndo_set_multicast_list = br_dev_set_multicast_list, | |
316 | .ndo_change_mtu = br_change_mtu, | |
317 | .ndo_do_ioctl = br_dev_ioctl, | |
c06ee961 | 318 | #ifdef CONFIG_NET_POLL_CONTROLLER |
91d2c34a | 319 | .ndo_netpoll_setup = br_netpoll_setup, |
c06ee961 WC |
320 | .ndo_netpoll_cleanup = br_netpoll_cleanup, |
321 | .ndo_poll_controller = br_poll_controller, | |
322 | #endif | |
a2dbb882 SH |
323 | }; |
324 | ||
14bb4789 | 325 | static void br_dev_free(struct net_device *dev) |
326 | { | |
327 | struct net_bridge *br = netdev_priv(dev); | |
328 | ||
329 | free_percpu(br->stats); | |
330 | free_netdev(dev); | |
331 | } | |
332 | ||
1da177e4 LT |
333 | void br_dev_setup(struct net_device *dev) |
334 | { | |
3ae41254 | 335 | random_ether_addr(dev->dev_addr); |
1da177e4 LT |
336 | ether_setup(dev); |
337 | ||
a2dbb882 | 338 | dev->netdev_ops = &br_netdev_ops; |
14bb4789 | 339 | dev->destructor = br_dev_free; |
9d6f229f | 340 | SET_ETHTOOL_OPS(dev, &br_ethtool_ops); |
1da177e4 | 341 | dev->tx_queue_len = 0; |
1da177e4 | 342 | dev->priv_flags = IFF_EBRIDGE; |
edb5e46f | 343 | |
9d6f229f | 344 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | |
4aa678ba | 345 | NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX | |
b63365a2 | 346 | NETIF_F_NETNS_LOCAL | NETIF_F_GSO; |
1da177e4 | 347 | } |