/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 *	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) */
 23netdev_tx_t 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	struct net_bridge_mdb_entry *mdst;
 29
 30	BR_INPUT_SKB_CB(skb)->brdev = dev;
 31
 32	dev->stats.tx_packets++;
 33	dev->stats.tx_bytes += skb->len;
 34
 35	skb_reset_mac_header(skb);
 36	skb_pull(skb, ETH_HLEN);
 37
 38	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_MROUTERS_ONLY(skb))
 44			br_multicast_deliver(mdst, skb);
 45		else
 46			br_flood_deliver(br, skb);
 47	} else if ((dst = __br_fdb_get(br, dest)) != NULL)
 48		br_deliver(dst->dst, skb);
 49	else
 50		br_flood_deliver(br, skb);
 51
 52out:
 53	return NETDEV_TX_OK;
 54}
 55
 56static int br_dev_open(struct net_device *dev)
 57{
 58	struct net_bridge *br = netdev_priv(dev);
 59
 60	br_features_recompute(br);
 61	netif_start_queue(dev);
 62	br_stp_enable_bridge(br);
 63	br_multicast_open(br);
 64
 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{
 74	struct net_bridge *br = netdev_priv(dev);
 75
 76	br_stp_disable_bridge(br);
 77	br_multicast_stop(br);
 78
 79	netif_stop_queue(dev);
 80
 81	return 0;
 82}
 83
 84static int br_change_mtu(struct net_device *dev, int new_mtu)
 85{
 86	struct net_bridge *br = netdev_priv(dev);
 87	if (new_mtu < 68 || new_mtu > br_min_mtu(br))
 88		return -EINVAL;
 89
 90	dev->mtu = new_mtu;
 91
 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
 97	return 0;
 98}
 99
100/* Allow setting mac address to any valid ethernet address. */
101static 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;
105
106	if (!is_valid_ether_addr(addr->sa_data))
107		return -EINVAL;
108
109	spin_lock_bh(&br->lock);
110	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
111	br_stp_change_bridge_id(br, addr->sa_data);
112	br->flags |= BR_SET_MAC_ADDR;
113	spin_unlock_bh(&br->lock);
114
115	return 0;
116}
117
118static 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)
157		br->feature_mask |= NETIF_F_NO_CSUM;
158	else
159		br->feature_mask &= ~NETIF_F_ALL_CSUM;
160
161	br_features_recompute(br);
162	return 0;
163}
164
165static const struct ethtool_ops br_ethtool_ops = {
166	.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,
175	.set_ufo	= ethtool_op_set_ufo,
176	.get_flags	= ethtool_op_get_flags,
177};
178
179static const struct net_device_ops br_netdev_ops = {
180	.ndo_open		 = br_dev_open,
181	.ndo_stop		 = br_dev_stop,
182	.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,
187};
188
189void br_dev_setup(struct net_device *dev)
190{
191	random_ether_addr(dev->dev_addr);
192	ether_setup(dev);
193
194	dev->netdev_ops = &br_netdev_ops;
195	dev->destructor = free_netdev;
196	SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
197	dev->tx_queue_len = 0;
198	dev->priv_flags = IFF_EBRIDGE;
199
200	dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
201			NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
202			NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
203}