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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Device handling code
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 Hemminger4505a3e2005-12-21 18:51:49 -080016#include <linux/etherdevice.h>
Stephen Hemmingeredb5e462005-12-21 19:00:58 -080017#include <linux/ethtool.h>
Stephen Hemminger4505a3e2005-12-21 18:51:49 -080018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/uaccess.h>
20#include "br_private.h"
21
Stephen Hemmingerf8ae7372006-03-20 22:58:36 -080022/* net device transmit always called with no BH (preempt_disabled) */
Stephen Hemminger6fef4c02009-08-31 19:50:41 +000023netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070024{
25 struct net_bridge *br = netdev_priv(dev);
26 const unsigned char *dest = skb->data;
27 struct net_bridge_fdb_entry *dst;
Herbert Xuc4fcb782010-02-27 19:41:48 +000028 struct net_bridge_mdb_entry *mdst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Herbert Xu6088a532010-02-27 19:41:42 +000030 BR_INPUT_SKB_CB(skb)->brdev = dev;
31
Pavel Emelyanova339f1c2008-05-21 14:13:47 -070032 dev->stats.tx_packets++;
33 dev->stats.tx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -070035 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 skb_pull(skb, ETH_HLEN);
37
Herbert Xuc4fcb782010-02-27 19:41:48 +000038 if (dest[0] & 1) {
39 if (br_multicast_rcv(br, NULL, skb))
40 goto out;
41
42 mdst = br_mdb_get(br, skb);
43 if (mdst || BR_INPUT_SKB_CB(skb)->mrouters_only)
44 br_multicast_deliver(mdst, skb);
45 else
46 br_flood_deliver(br, skb);
47 } else if ((dst = __br_fdb_get(br, dest)) != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 br_deliver(dst->dst, skb);
49 else
Herbert Xue081e1e2007-09-16 16:20:48 -070050 br_flood_deliver(br, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Herbert Xuc4fcb782010-02-27 19:41:48 +000052out:
Patrick McHardy6ed10652009-06-23 06:03:08 +000053 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054}
55
56static int br_dev_open(struct net_device *dev)
57{
Stephen Hemminger81d35302005-05-29 14:15:17 -070058 struct net_bridge *br = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Stephen Hemminger81d35302005-05-29 14:15:17 -070060 br_features_recompute(br);
61 netif_start_queue(dev);
62 br_stp_enable_bridge(br);
Herbert Xu3fe2d7c2010-02-28 00:49:38 -080063 br_multicast_open(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65 return 0;
66}
67
68static void br_dev_set_multicast_list(struct net_device *dev)
69{
70}
71
72static int br_dev_stop(struct net_device *dev)
73{
Herbert Xu3fe2d7c2010-02-28 00:49:38 -080074 struct net_bridge *br = netdev_priv(dev);
75
76 br_stp_disable_bridge(br);
77 br_multicast_stop(br);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79 netif_stop_queue(dev);
80
81 return 0;
82}
83
84static int br_change_mtu(struct net_device *dev, int new_mtu)
85{
Simon Wunderlich4adf0af2008-07-30 16:27:55 -070086 struct net_bridge *br = netdev_priv(dev);
87 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return -EINVAL;
89
90 dev->mtu = new_mtu;
Simon Wunderlich4adf0af2008-07-30 16:27:55 -070091
92#ifdef CONFIG_BRIDGE_NETFILTER
93 /* remember the MTU in the rtable for PMTU */
94 br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
95#endif
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 return 0;
98}
99
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700100/* Allow setting mac address to any valid ethernet address. */
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800101static int br_set_mac_address(struct net_device *dev, void *p)
102{
103 struct net_bridge *br = netdev_priv(dev);
104 struct sockaddr *addr = p;
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700105
106 if (!is_valid_ether_addr(addr->sa_data))
107 return -EINVAL;
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800108
109 spin_lock_bh(&br->lock);
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700110 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
111 br_stp_change_bridge_id(br, addr->sa_data);
Stephen Hemminger92c05742008-06-17 16:10:06 -0700112 br->flags |= BR_SET_MAC_ADDR;
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800113 spin_unlock_bh(&br->lock);
114
Stephen Hemmingerffe1d492007-04-09 11:49:58 -0700115 return 0;
Stephen Hemminger4505a3e2005-12-21 18:51:49 -0800116}
117
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800118static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
119{
120 strcpy(info->driver, "bridge");
121 strcpy(info->version, BR_VERSION);
122 strcpy(info->fw_version, "N/A");
123 strcpy(info->bus_info, "N/A");
124}
125
126static int br_set_sg(struct net_device *dev, u32 data)
127{
128 struct net_bridge *br = netdev_priv(dev);
129
130 if (data)
131 br->feature_mask |= NETIF_F_SG;
132 else
133 br->feature_mask &= ~NETIF_F_SG;
134
135 br_features_recompute(br);
136 return 0;
137}
138
139static int br_set_tso(struct net_device *dev, u32 data)
140{
141 struct net_bridge *br = netdev_priv(dev);
142
143 if (data)
144 br->feature_mask |= NETIF_F_TSO;
145 else
146 br->feature_mask &= ~NETIF_F_TSO;
147
148 br_features_recompute(br);
149 return 0;
150}
151
152static int br_set_tx_csum(struct net_device *dev, u32 data)
153{
154 struct net_bridge *br = netdev_priv(dev);
155
156 if (data)
Herbert Xu2c6cc0d2006-06-17 22:06:45 -0700157 br->feature_mask |= NETIF_F_NO_CSUM;
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800158 else
Herbert Xu2c6cc0d2006-06-17 22:06:45 -0700159 br->feature_mask &= ~NETIF_F_ALL_CSUM;
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800160
161 br_features_recompute(br);
162 return 0;
163}
164
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800165static const struct ethtool_ops br_ethtool_ops = {
Stephen Hemmingere4119a42008-08-15 19:51:07 -0700166 .get_drvinfo = br_getinfo,
167 .get_link = ethtool_op_get_link,
168 .get_tx_csum = ethtool_op_get_tx_csum,
169 .set_tx_csum = br_set_tx_csum,
170 .get_sg = ethtool_op_get_sg,
171 .set_sg = br_set_sg,
172 .get_tso = ethtool_op_get_tso,
173 .set_tso = br_set_tso,
174 .get_ufo = ethtool_op_get_ufo,
Sridhar Samudrala72dad212009-10-07 12:41:17 +0000175 .set_ufo = ethtool_op_set_ufo,
Stephen Hemmingere4119a42008-08-15 19:51:07 -0700176 .get_flags = ethtool_op_get_flags,
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800177};
178
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800179static const struct net_device_ops br_netdev_ops = {
180 .ndo_open = br_dev_open,
181 .ndo_stop = br_dev_stop,
Stephen Hemminger00829822008-11-20 20:14:53 -0800182 .ndo_start_xmit = br_dev_xmit,
183 .ndo_set_mac_address = br_set_mac_address,
184 .ndo_set_multicast_list = br_dev_set_multicast_list,
185 .ndo_change_mtu = br_change_mtu,
186 .ndo_do_ioctl = br_dev_ioctl,
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800187};
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189void br_dev_setup(struct net_device *dev)
190{
Stephen Hemminger3ae41252007-12-16 13:35:51 -0800191 random_ether_addr(dev->dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 ether_setup(dev);
193
Stephen Hemmingera2dbb882008-11-19 21:49:00 -0800194 dev->netdev_ops = &br_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 dev->destructor = free_netdev;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900196 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 dev->tx_queue_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 dev->priv_flags = IFF_EBRIDGE;
Stephen Hemmingeredb5e462005-12-21 19:00:58 -0800199
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900200 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700201 NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
Herbert Xub63365a2008-10-23 01:11:29 -0700202 NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203}