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 | ||
f8ae737d | 25 | /* net device transmit always called with no BH (preempt_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 | ||
14bb4789 | 41 | brstats->tx_packets++; |
42 | brstats->tx_bytes += skb->len; | |
6088a539 | 43 | |
14bb4789 | 44 | BR_INPUT_SKB_CB(skb)->brdev = dev; |
1da177e4 | 45 | |
459a98ed | 46 | skb_reset_mac_header(skb); |
1da177e4 LT |
47 | skb_pull(skb, ETH_HLEN); |
48 | ||
7180f775 | 49 | if (is_multicast_ether_addr(dest)) { |
c4fcb78c HX |
50 | if (br_multicast_rcv(br, NULL, skb)) |
51 | goto out; | |
52 | ||
53 | mdst = br_mdb_get(br, skb); | |
32dec5dd | 54 | if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) |
c4fcb78c HX |
55 | br_multicast_deliver(mdst, skb); |
56 | else | |
57 | br_flood_deliver(br, skb); | |
58 | } else if ((dst = __br_fdb_get(br, dest)) != NULL) | |
1da177e4 LT |
59 | br_deliver(dst->dst, skb); |
60 | else | |
e081e1e3 | 61 | br_flood_deliver(br, skb); |
1da177e4 | 62 | |
c4fcb78c | 63 | out: |
6ed10654 | 64 | return NETDEV_TX_OK; |
1da177e4 LT |
65 | } |
66 | ||
67 | static int br_dev_open(struct net_device *dev) | |
68 | { | |
81d35307 | 69 | struct net_bridge *br = netdev_priv(dev); |
1da177e4 | 70 | |
81d35307 SH |
71 | br_features_recompute(br); |
72 | netif_start_queue(dev); | |
73 | br_stp_enable_bridge(br); | |
3fe2d7c7 | 74 | br_multicast_open(br); |
1da177e4 LT |
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 | { | |
3fe2d7c7 HX |
85 | struct net_bridge *br = netdev_priv(dev); |
86 | ||
87 | br_stp_disable_bridge(br); | |
88 | br_multicast_stop(br); | |
1da177e4 LT |
89 | |
90 | netif_stop_queue(dev); | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
14bb4789 | 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 | ||
1da177e4 LT |
120 | static int br_change_mtu(struct net_device *dev, int new_mtu) |
121 | { | |
4adf0af6 SW |
122 | struct net_bridge *br = netdev_priv(dev); |
123 | if (new_mtu < 68 || new_mtu > br_min_mtu(br)) | |
1da177e4 LT |
124 | return -EINVAL; |
125 | ||
126 | dev->mtu = new_mtu; | |
4adf0af6 SW |
127 | |
128 | #ifdef CONFIG_BRIDGE_NETFILTER | |
129 | /* remember the MTU in the rtable for PMTU */ | |
130 | br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu; | |
131 | #endif | |
132 | ||
1da177e4 LT |
133 | return 0; |
134 | } | |
135 | ||
ffe1d49c | 136 | /* Allow setting mac address to any valid ethernet address. */ |
4505a3ef SH |
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; | |
ffe1d49c SH |
141 | |
142 | if (!is_valid_ether_addr(addr->sa_data)) | |
143 | return -EINVAL; | |
4505a3ef SH |
144 | |
145 | spin_lock_bh(&br->lock); | |
ffe1d49c SH |
146 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); |
147 | br_stp_change_bridge_id(br, addr->sa_data); | |
92c0574f | 148 | br->flags |= BR_SET_MAC_ADDR; |
4505a3ef SH |
149 | spin_unlock_bh(&br->lock); |
150 | ||
ffe1d49c | 151 | return 0; |
4505a3ef SH |
152 | } |
153 | ||
edb5e46f SH |
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) | |
2c6cc0d8 | 193 | br->feature_mask |= NETIF_F_NO_CSUM; |
edb5e46f | 194 | else |
2c6cc0d8 | 195 | br->feature_mask &= ~NETIF_F_ALL_CSUM; |
edb5e46f SH |
196 | |
197 | br_features_recompute(br); | |
198 | return 0; | |
199 | } | |
200 | ||
c06ee961 | 201 | #ifdef CONFIG_NET_POLL_CONTROLLER |
cfb478da | 202 | static bool br_devices_support_netpoll(struct net_bridge *br) |
c06ee961 WC |
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 | ||
cfb478da | 220 | void br_netpoll_cleanup(struct net_device *dev) |
c06ee961 | 221 | { |
cfb478da | 222 | struct net_bridge *br = netdev_priv(dev); |
c06ee961 WC |
223 | struct net_bridge_port *p, *n; |
224 | const struct net_device_ops *ops; | |
225 | ||
226 | br->dev->npinfo = NULL; | |
227 | list_for_each_entry_safe(p, n, &br->port_list, list) { | |
228 | if (p->dev) { | |
229 | ops = p->dev->netdev_ops; | |
230 | if (ops->ndo_netpoll_cleanup) | |
231 | ops->ndo_netpoll_cleanup(p->dev); | |
232 | else | |
233 | p->dev->npinfo = NULL; | |
234 | } | |
235 | } | |
236 | } | |
237 | ||
cfb478da | 238 | void br_netpoll_disable(struct net_bridge *br, |
239 | struct net_device *dev) | |
240 | { | |
241 | if (br_devices_support_netpoll(br)) | |
242 | br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL; | |
243 | if (dev->netdev_ops->ndo_netpoll_cleanup) | |
244 | dev->netdev_ops->ndo_netpoll_cleanup(dev); | |
245 | else | |
246 | dev->npinfo = NULL; | |
247 | } | |
c06ee961 | 248 | |
cfb478da | 249 | void br_netpoll_enable(struct net_bridge *br, |
250 | struct net_device *dev) | |
c06ee961 | 251 | { |
cfb478da | 252 | if (br_devices_support_netpoll(br)) { |
253 | br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL; | |
254 | if (br->dev->npinfo) | |
255 | dev->npinfo = br->dev->npinfo; | |
256 | } else if (!(br->dev->priv_flags & IFF_DISABLE_NETPOLL)) { | |
257 | br->dev->priv_flags |= IFF_DISABLE_NETPOLL; | |
28a16c97 | 258 | br_info(br,"new device %s does not support netpoll (disabling)", |
259 | dev->name); | |
cfb478da | 260 | } |
c06ee961 WC |
261 | } |
262 | ||
263 | #endif | |
264 | ||
a2dbb882 | 265 | static const struct ethtool_ops br_ethtool_ops = { |
e4119a43 SH |
266 | .get_drvinfo = br_getinfo, |
267 | .get_link = ethtool_op_get_link, | |
268 | .get_tx_csum = ethtool_op_get_tx_csum, | |
269 | .set_tx_csum = br_set_tx_csum, | |
270 | .get_sg = ethtool_op_get_sg, | |
271 | .set_sg = br_set_sg, | |
272 | .get_tso = ethtool_op_get_tso, | |
273 | .set_tso = br_set_tso, | |
274 | .get_ufo = ethtool_op_get_ufo, | |
72dad218 | 275 | .set_ufo = ethtool_op_set_ufo, |
e4119a43 | 276 | .get_flags = ethtool_op_get_flags, |
edb5e46f SH |
277 | }; |
278 | ||
a2dbb882 SH |
279 | static const struct net_device_ops br_netdev_ops = { |
280 | .ndo_open = br_dev_open, | |
281 | .ndo_stop = br_dev_stop, | |
00829823 | 282 | .ndo_start_xmit = br_dev_xmit, |
14bb4789 | 283 | .ndo_get_stats = br_get_stats, |
00829823 SH |
284 | .ndo_set_mac_address = br_set_mac_address, |
285 | .ndo_set_multicast_list = br_dev_set_multicast_list, | |
286 | .ndo_change_mtu = br_change_mtu, | |
287 | .ndo_do_ioctl = br_dev_ioctl, | |
c06ee961 WC |
288 | #ifdef CONFIG_NET_POLL_CONTROLLER |
289 | .ndo_netpoll_cleanup = br_netpoll_cleanup, | |
c06ee961 | 290 | #endif |
a2dbb882 SH |
291 | }; |
292 | ||
14bb4789 | 293 | static void br_dev_free(struct net_device *dev) |
294 | { | |
295 | struct net_bridge *br = netdev_priv(dev); | |
296 | ||
297 | free_percpu(br->stats); | |
298 | free_netdev(dev); | |
299 | } | |
300 | ||
1da177e4 LT |
301 | void br_dev_setup(struct net_device *dev) |
302 | { | |
3ae41254 | 303 | random_ether_addr(dev->dev_addr); |
1da177e4 LT |
304 | ether_setup(dev); |
305 | ||
a2dbb882 | 306 | dev->netdev_ops = &br_netdev_ops; |
14bb4789 | 307 | dev->destructor = br_dev_free; |
9d6f229f | 308 | SET_ETHTOOL_OPS(dev, &br_ethtool_ops); |
1da177e4 | 309 | dev->tx_queue_len = 0; |
1da177e4 | 310 | dev->priv_flags = IFF_EBRIDGE; |
edb5e46f | 311 | |
9d6f229f | 312 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | |
4aa678ba | 313 | NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX | |
b63365a2 | 314 | NETIF_F_NETNS_LOCAL | NETIF_F_GSO; |
1da177e4 | 315 | } |