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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 | /* net device transmit always called with no BH (preempt_disabled) */ | |
26 | netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev) | |
27 | { | |
28 | struct net_bridge *br = netdev_priv(dev); | |
29 | const unsigned char *dest = skb->data; | |
30 | struct net_bridge_fdb_entry *dst; | |
31 | struct net_bridge_mdb_entry *mdst; | |
32 | struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats); | |
33 | ||
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 | ||
41 | brstats->tx_packets++; | |
42 | brstats->tx_bytes += skb->len; | |
43 | ||
44 | BR_INPUT_SKB_CB(skb)->brdev = dev; | |
45 | ||
46 | skb_reset_mac_header(skb); | |
47 | skb_pull(skb, ETH_HLEN); | |
48 | ||
49 | if (is_multicast_ether_addr(dest)) { | |
50 | if (br_multicast_rcv(br, NULL, skb)) | |
51 | goto out; | |
52 | ||
53 | mdst = br_mdb_get(br, skb); | |
54 | if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) | |
55 | br_multicast_deliver(mdst, skb); | |
56 | else | |
57 | br_flood_deliver(br, skb); | |
58 | } else if ((dst = __br_fdb_get(br, dest)) != NULL) | |
59 | br_deliver(dst->dst, skb); | |
60 | else | |
61 | br_flood_deliver(br, skb); | |
62 | ||
63 | out: | |
64 | return NETDEV_TX_OK; | |
65 | } | |
66 | ||
67 | static int br_dev_open(struct net_device *dev) | |
68 | { | |
69 | struct net_bridge *br = netdev_priv(dev); | |
70 | ||
71 | br_features_recompute(br); | |
72 | netif_start_queue(dev); | |
73 | br_stp_enable_bridge(br); | |
74 | br_multicast_open(br); | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | static void br_dev_set_multicast_list(struct net_device *dev) | |
80 | { | |
81 | } | |
82 | ||
83 | static int br_dev_stop(struct net_device *dev) | |
84 | { | |
85 | struct net_bridge *br = netdev_priv(dev); | |
86 | ||
87 | br_stp_disable_bridge(br); | |
88 | br_multicast_stop(br); | |
89 | ||
90 | netif_stop_queue(dev); | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | static struct net_device_stats *br_get_stats(struct net_device *dev) | |
96 | { | |
97 | struct net_bridge *br = netdev_priv(dev); | |
98 | struct net_device_stats *stats = &dev->stats; | |
99 | struct br_cpu_netstats sum = { 0 }; | |
100 | unsigned int cpu; | |
101 | ||
102 | for_each_possible_cpu(cpu) { | |
103 | const struct br_cpu_netstats *bstats | |
104 | = per_cpu_ptr(br->stats, cpu); | |
105 | ||
106 | sum.tx_bytes += bstats->tx_bytes; | |
107 | sum.tx_packets += bstats->tx_packets; | |
108 | sum.rx_bytes += bstats->rx_bytes; | |
109 | sum.rx_packets += bstats->rx_packets; | |
110 | } | |
111 | ||
112 | stats->tx_bytes = sum.tx_bytes; | |
113 | stats->tx_packets = sum.tx_packets; | |
114 | stats->rx_bytes = sum.rx_bytes; | |
115 | stats->rx_packets = sum.rx_packets; | |
116 | ||
117 | return stats; | |
118 | } | |
119 | ||
120 | static int br_change_mtu(struct net_device *dev, int new_mtu) | |
121 | { | |
122 | struct net_bridge *br = netdev_priv(dev); | |
123 | if (new_mtu < 68 || new_mtu > br_min_mtu(br)) | |
124 | return -EINVAL; | |
125 | ||
126 | dev->mtu = new_mtu; | |
127 | ||
128 | #ifdef CONFIG_BRIDGE_NETFILTER | |
129 | /* remember the MTU in the rtable for PMTU */ | |
130 | br->fake_rtable.dst.metrics[RTAX_MTU - 1] = new_mtu; | |
131 | #endif | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | /* Allow setting mac address to any valid ethernet address. */ | |
137 | static int br_set_mac_address(struct net_device *dev, void *p) | |
138 | { | |
139 | struct net_bridge *br = netdev_priv(dev); | |
140 | struct sockaddr *addr = p; | |
141 | ||
142 | if (!is_valid_ether_addr(addr->sa_data)) | |
143 | return -EINVAL; | |
144 | ||
145 | spin_lock_bh(&br->lock); | |
146 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); | |
147 | br_stp_change_bridge_id(br, addr->sa_data); | |
148 | br->flags |= BR_SET_MAC_ADDR; | |
149 | spin_unlock_bh(&br->lock); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
155 | { | |
156 | strcpy(info->driver, "bridge"); | |
157 | strcpy(info->version, BR_VERSION); | |
158 | strcpy(info->fw_version, "N/A"); | |
159 | strcpy(info->bus_info, "N/A"); | |
160 | } | |
161 | ||
162 | static int br_set_sg(struct net_device *dev, u32 data) | |
163 | { | |
164 | struct net_bridge *br = netdev_priv(dev); | |
165 | ||
166 | if (data) | |
167 | br->feature_mask |= NETIF_F_SG; | |
168 | else | |
169 | br->feature_mask &= ~NETIF_F_SG; | |
170 | ||
171 | br_features_recompute(br); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | static int br_set_tso(struct net_device *dev, u32 data) | |
176 | { | |
177 | struct net_bridge *br = netdev_priv(dev); | |
178 | ||
179 | if (data) | |
180 | br->feature_mask |= NETIF_F_TSO; | |
181 | else | |
182 | br->feature_mask &= ~NETIF_F_TSO; | |
183 | ||
184 | br_features_recompute(br); | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static int br_set_tx_csum(struct net_device *dev, u32 data) | |
189 | { | |
190 | struct net_bridge *br = netdev_priv(dev); | |
191 | ||
192 | if (data) | |
193 | br->feature_mask |= NETIF_F_NO_CSUM; | |
194 | else | |
195 | br->feature_mask &= ~NETIF_F_ALL_CSUM; | |
196 | ||
197 | br_features_recompute(br); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
202 | static bool br_devices_support_netpoll(struct net_bridge *br) | |
203 | { | |
204 | struct net_bridge_port *p; | |
205 | bool ret = true; | |
206 | int count = 0; | |
207 | unsigned long flags; | |
208 | ||
209 | spin_lock_irqsave(&br->lock, flags); | |
210 | list_for_each_entry(p, &br->port_list, list) { | |
211 | count++; | |
212 | if ((p->dev->priv_flags & IFF_DISABLE_NETPOLL) || | |
213 | !p->dev->netdev_ops->ndo_poll_controller) | |
214 | ret = false; | |
215 | } | |
216 | spin_unlock_irqrestore(&br->lock, flags); | |
217 | return count != 0 && ret; | |
218 | } | |
219 | ||
220 | static void br_poll_controller(struct net_device *br_dev) | |
221 | { | |
222 | struct netpoll *np = br_dev->npinfo->netpoll; | |
223 | ||
224 | if (np->real_dev != br_dev) | |
225 | netpoll_poll_dev(np->real_dev); | |
226 | } | |
227 | ||
228 | void br_netpoll_cleanup(struct net_device *dev) | |
229 | { | |
230 | struct net_bridge *br = netdev_priv(dev); | |
231 | struct net_bridge_port *p, *n; | |
232 | const struct net_device_ops *ops; | |
233 | ||
234 | br->dev->npinfo = NULL; | |
235 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
236 | if (p->dev) { | |
237 | ops = p->dev->netdev_ops; | |
238 | if (ops->ndo_netpoll_cleanup) | |
239 | ops->ndo_netpoll_cleanup(p->dev); | |
240 | else | |
241 | p->dev->npinfo = NULL; | |
242 | } | |
243 | } | |
244 | } | |
245 | ||
246 | void br_netpoll_disable(struct net_bridge *br, | |
247 | struct net_device *dev) | |
248 | { | |
249 | if (br_devices_support_netpoll(br)) | |
250 | br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL; | |
251 | if (dev->netdev_ops->ndo_netpoll_cleanup) | |
252 | dev->netdev_ops->ndo_netpoll_cleanup(dev); | |
253 | else | |
254 | dev->npinfo = NULL; | |
255 | } | |
256 | ||
257 | void br_netpoll_enable(struct net_bridge *br, | |
258 | struct net_device *dev) | |
259 | { | |
260 | if (br_devices_support_netpoll(br)) { | |
261 | br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL; | |
262 | if (br->dev->npinfo) | |
263 | dev->npinfo = br->dev->npinfo; | |
264 | } else if (!(br->dev->priv_flags & IFF_DISABLE_NETPOLL)) { | |
265 | br->dev->priv_flags |= IFF_DISABLE_NETPOLL; | |
266 | br_info(br,"new device %s does not support netpoll (disabling)", | |
267 | dev->name); | |
268 | } | |
269 | } | |
270 | ||
271 | #endif | |
272 | ||
273 | static const struct ethtool_ops br_ethtool_ops = { | |
274 | .get_drvinfo = br_getinfo, | |
275 | .get_link = ethtool_op_get_link, | |
276 | .get_tx_csum = ethtool_op_get_tx_csum, | |
277 | .set_tx_csum = br_set_tx_csum, | |
278 | .get_sg = ethtool_op_get_sg, | |
279 | .set_sg = br_set_sg, | |
280 | .get_tso = ethtool_op_get_tso, | |
281 | .set_tso = br_set_tso, | |
282 | .get_ufo = ethtool_op_get_ufo, | |
283 | .set_ufo = ethtool_op_set_ufo, | |
284 | .get_flags = ethtool_op_get_flags, | |
285 | }; | |
286 | ||
287 | static const struct net_device_ops br_netdev_ops = { | |
288 | .ndo_open = br_dev_open, | |
289 | .ndo_stop = br_dev_stop, | |
290 | .ndo_start_xmit = br_dev_xmit, | |
291 | .ndo_get_stats = br_get_stats, | |
292 | .ndo_set_mac_address = br_set_mac_address, | |
293 | .ndo_set_multicast_list = br_dev_set_multicast_list, | |
294 | .ndo_change_mtu = br_change_mtu, | |
295 | .ndo_do_ioctl = br_dev_ioctl, | |
296 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
297 | .ndo_netpoll_cleanup = br_netpoll_cleanup, | |
298 | .ndo_poll_controller = br_poll_controller, | |
299 | #endif | |
300 | }; | |
301 | ||
302 | static void br_dev_free(struct net_device *dev) | |
303 | { | |
304 | struct net_bridge *br = netdev_priv(dev); | |
305 | ||
306 | free_percpu(br->stats); | |
307 | free_netdev(dev); | |
308 | } | |
309 | ||
310 | void br_dev_setup(struct net_device *dev) | |
311 | { | |
312 | random_ether_addr(dev->dev_addr); | |
313 | ether_setup(dev); | |
314 | ||
315 | dev->netdev_ops = &br_netdev_ops; | |
316 | dev->destructor = br_dev_free; | |
317 | SET_ETHTOOL_OPS(dev, &br_ethtool_ops); | |
318 | dev->tx_queue_len = 0; | |
319 | dev->priv_flags = IFF_EBRIDGE; | |
320 | ||
321 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | | |
322 | NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX | | |
323 | NETIF_F_NETNS_LOCAL | NETIF_F_GSO; | |
324 | } |