[NET]: Fix segmentation of linear packets
[linux-2.6.git] / net / bridge / br_device.c
1 /*
2  *      Device handling code
3  *      Linux ethernet bridge
4  *
5  *      Authors:
6  *      Lennert Buytenhek               <buytenh@gnu.org>
7  *
8  *      $Id: br_device.c,v 1.6 2001/12/24 00:59:55 davem Exp $
9  *
10  *      This program is free software; you can redistribute it and/or
11  *      modify it under the terms of the GNU General Public License
12  *      as published by the Free Software Foundation; either version
13  *      2 of the License, or (at your option) any later version.
14  */
15
16 #include <linux/kernel.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <linux/ethtool.h>
20
21 #include <asm/uaccess.h>
22 #include "br_private.h"
23
24 static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
25 {
26         struct net_bridge *br = netdev_priv(dev);
27         return &br->statistics;
28 }
29
30 /* net device transmit always called with no BH (preempt_disabled) */
31 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
32 {
33         struct net_bridge *br = netdev_priv(dev);
34         const unsigned char *dest = skb->data;
35         struct net_bridge_fdb_entry *dst;
36
37         br->statistics.tx_packets++;
38         br->statistics.tx_bytes += skb->len;
39
40         skb->mac.raw = skb->data;
41         skb_pull(skb, ETH_HLEN);
42
43         if (dest[0] & 1) 
44                 br_flood_deliver(br, skb, 0);
45         else if ((dst = __br_fdb_get(br, dest)) != NULL)
46                 br_deliver(dst->dst, skb);
47         else
48                 br_flood_deliver(br, skb, 0);
49
50         return 0;
51 }
52
53 static int br_dev_open(struct net_device *dev)
54 {
55         struct net_bridge *br = netdev_priv(dev);
56
57         br_features_recompute(br);
58         netif_start_queue(dev);
59         br_stp_enable_bridge(br);
60
61         return 0;
62 }
63
64 static void br_dev_set_multicast_list(struct net_device *dev)
65 {
66 }
67
68 static int br_dev_stop(struct net_device *dev)
69 {
70         br_stp_disable_bridge(netdev_priv(dev));
71
72         netif_stop_queue(dev);
73
74         return 0;
75 }
76
77 static int br_change_mtu(struct net_device *dev, int new_mtu)
78 {
79         if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev)))
80                 return -EINVAL;
81
82         dev->mtu = new_mtu;
83         return 0;
84 }
85
86 /* Allow setting mac address of pseudo-bridge to be same as
87  * any of the bound interfaces
88  */
89 static int br_set_mac_address(struct net_device *dev, void *p)
90 {
91         struct net_bridge *br = netdev_priv(dev);
92         struct sockaddr *addr = p;
93         struct net_bridge_port *port;
94         int err = -EADDRNOTAVAIL;
95
96         spin_lock_bh(&br->lock);
97         list_for_each_entry(port, &br->port_list, list) {
98                 if (!compare_ether_addr(port->dev->dev_addr, addr->sa_data)) {
99                         br_stp_change_bridge_id(br, addr->sa_data);
100                         err = 0;
101                         break;
102                 }
103         }
104         spin_unlock_bh(&br->lock);
105
106         return err;
107 }
108
109 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
110 {
111         strcpy(info->driver, "bridge");
112         strcpy(info->version, BR_VERSION);
113         strcpy(info->fw_version, "N/A");
114         strcpy(info->bus_info, "N/A");
115 }
116
117 static int br_set_sg(struct net_device *dev, u32 data)
118 {
119         struct net_bridge *br = netdev_priv(dev);
120
121         if (data)
122                 br->feature_mask |= NETIF_F_SG;
123         else
124                 br->feature_mask &= ~NETIF_F_SG;
125
126         br_features_recompute(br);
127         return 0;
128 }
129
130 static int br_set_tso(struct net_device *dev, u32 data)
131 {
132         struct net_bridge *br = netdev_priv(dev);
133
134         if (data)
135                 br->feature_mask |= NETIF_F_TSO;
136         else
137                 br->feature_mask &= ~NETIF_F_TSO;
138
139         br_features_recompute(br);
140         return 0;
141 }
142
143 static int br_set_tx_csum(struct net_device *dev, u32 data)
144 {
145         struct net_bridge *br = netdev_priv(dev);
146
147         if (data)
148                 br->feature_mask |= NETIF_F_NO_CSUM;
149         else
150                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
151
152         br_features_recompute(br);
153         return 0;
154 }
155
156 static struct ethtool_ops br_ethtool_ops = {
157         .get_drvinfo = br_getinfo,
158         .get_link = ethtool_op_get_link,
159         .get_sg = ethtool_op_get_sg,
160         .set_sg = br_set_sg,
161         .get_tx_csum = ethtool_op_get_tx_csum,
162         .set_tx_csum = br_set_tx_csum,
163         .get_tso = ethtool_op_get_tso,
164         .set_tso = br_set_tso,
165 };
166
167 void br_dev_setup(struct net_device *dev)
168 {
169         memset(dev->dev_addr, 0, ETH_ALEN);
170
171         ether_setup(dev);
172
173         dev->do_ioctl = br_dev_ioctl;
174         dev->get_stats = br_dev_get_stats;
175         dev->hard_start_xmit = br_dev_xmit;
176         dev->open = br_dev_open;
177         dev->set_multicast_list = br_dev_set_multicast_list;
178         dev->change_mtu = br_change_mtu;
179         dev->destructor = free_netdev;
180         SET_MODULE_OWNER(dev);
181         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
182         dev->stop = br_dev_stop;
183         dev->tx_queue_len = 0;
184         dev->set_mac_address = br_set_mac_address;
185         dev->priv_flags = IFF_EBRIDGE;
186
187         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
188                         NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_GSO_ROBUST;
189 }