tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/etherdevice.h>
17#include <linux/ethtool.h>
18
19#include <asm/uaccess.h>
20#include "br_private.h"
21
22/* net device transmit always called with no BH (preempt_disabled) */
23int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
24{
25 struct net_bridge *br = netdev_priv(dev);
26 const unsigned char *dest = skb->data;
27 struct net_bridge_fdb_entry *dst;
28
29 dev->stats.tx_packets++;
30 dev->stats.tx_bytes += skb->len;
31
32 skb_reset_mac_header(skb);
33 skb_pull(skb, ETH_HLEN);
34
35 if (dest[0] & 1)
36 br_flood_deliver(br, skb);
37 else if ((dst = __br_fdb_get(br, dest)) != NULL)
38 br_deliver(dst->dst, skb);
39 else
40 br_flood_deliver(br, skb);
41
42 return 0;
43}
44
45static int br_dev_open(struct net_device *dev)
46{
47 struct net_bridge *br = netdev_priv(dev);
48
49 br_features_recompute(br);
50 netif_start_queue(dev);
51 br_stp_enable_bridge(br);
52
53 return 0;
54}
55
56static void br_dev_set_multicast_list(struct net_device *dev)
57{
58}
59
60static int br_dev_stop(struct net_device *dev)
61{
62 br_stp_disable_bridge(netdev_priv(dev));
63
64 netif_stop_queue(dev);
65
66 return 0;
67}
68
69static int br_change_mtu(struct net_device *dev, int new_mtu)
70{
71 struct net_bridge *br = netdev_priv(dev);
72 if (new_mtu < 68 || new_mtu > br_min_mtu(br))
73 return -EINVAL;
74
75 dev->mtu = new_mtu;
76
77#ifdef CONFIG_BRIDGE_NETFILTER
78 /* remember the MTU in the rtable for PMTU */
79 br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
80#endif
81
82 return 0;
83}
84
85/* Allow setting mac address to any valid ethernet address. */
86static int br_set_mac_address(struct net_device *dev, void *p)
87{
88 struct net_bridge *br = netdev_priv(dev);
89 struct sockaddr *addr = p;
90
91 if (!is_valid_ether_addr(addr->sa_data))
92 return -EINVAL;
93
94 spin_lock_bh(&br->lock);
95 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
96 br_stp_change_bridge_id(br, addr->sa_data);
97 br->flags |= BR_SET_MAC_ADDR;
98 spin_unlock_bh(&br->lock);
99
100 return 0;
101}
102
103static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
104{
105 strcpy(info->driver, "bridge");
106 strcpy(info->version, BR_VERSION);
107 strcpy(info->fw_version, "N/A");
108 strcpy(info->bus_info, "N/A");
109}
110
111static int br_set_sg(struct net_device *dev, u32 data)
112{
113 struct net_bridge *br = netdev_priv(dev);
114
115 if (data)
116 br->feature_mask |= NETIF_F_SG;
117 else
118 br->feature_mask &= ~NETIF_F_SG;
119
120 br_features_recompute(br);
121 return 0;
122}
123
124static int br_set_tso(struct net_device *dev, u32 data)
125{
126 struct net_bridge *br = netdev_priv(dev);
127
128 if (data)
129 br->feature_mask |= NETIF_F_TSO;
130 else
131 br->feature_mask &= ~NETIF_F_TSO;
132
133 br_features_recompute(br);
134 return 0;
135}
136
137static int br_set_tx_csum(struct net_device *dev, u32 data)
138{
139 struct net_bridge *br = netdev_priv(dev);
140
141 if (data)
142 br->feature_mask |= NETIF_F_NO_CSUM;
143 else
144 br->feature_mask &= ~NETIF_F_ALL_CSUM;
145
146 br_features_recompute(br);
147 return 0;
148}
149
150static struct ethtool_ops br_ethtool_ops = {
151 .get_drvinfo = br_getinfo,
152 .get_link = ethtool_op_get_link,
153 .get_tx_csum = ethtool_op_get_tx_csum,
154 .set_tx_csum = br_set_tx_csum,
155 .get_sg = ethtool_op_get_sg,
156 .set_sg = br_set_sg,
157 .get_tso = ethtool_op_get_tso,
158 .set_tso = br_set_tso,
159 .get_ufo = ethtool_op_get_ufo,
160 .get_flags = ethtool_op_get_flags,
161};
162
163void br_dev_setup(struct net_device *dev)
164{
165 random_ether_addr(dev->dev_addr);
166 ether_setup(dev);
167
168 dev->do_ioctl = br_dev_ioctl;
169 dev->hard_start_xmit = br_dev_xmit;
170 dev->open = br_dev_open;
171 dev->set_multicast_list = br_dev_set_multicast_list;
172 dev->change_mtu = br_change_mtu;
173 dev->destructor = free_netdev;
174 SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
175 dev->stop = br_dev_stop;
176 dev->tx_queue_len = 0;
177 dev->set_mac_address = br_set_mac_address;
178 dev->priv_flags = IFF_EBRIDGE;
179
180 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
181 NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX;
182}