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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) */ |
23 | netdev_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 | |
52 | out: |
53 | return NETDEV_TX_OK; |
54 | } |
55 | |
56 | static 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 | |
68 | static void br_dev_set_multicast_list(struct net_device *dev) |
69 | { |
70 | } |
71 | |
72 | static 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 | |
84 | static 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. */ |
101 | static 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 | |
118 | static 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 | |
126 | static 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 | |
139 | static 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 | |
152 | static 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 | |
165 | static 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 | |
179 | static 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 | |
189 | void 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 | } |
204 |
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