2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
9 #include <linux/config.h>
10 #include <linux/module.h>
11 #include <linux/proc_fs.h>
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
14 #include <linux/interrupt.h>
16 #include <linux/types.h>
17 #include <linux/sysctl.h>
18 #include <linux/string.h>
19 #include <linux/socket.h>
20 #include <linux/errno.h>
21 #include <linux/fcntl.h>
23 #include <linux/if_ether.h> /* For the statistics structure. */
25 #include <asm/system.h>
26 #include <asm/uaccess.h>
29 #include <linux/inet.h>
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/if_arp.h>
33 #include <linux/skbuff.h>
39 #include <net/netrom.h>
42 * Only allow IP over NET/ROM frames through if the netrom device is up.
45 int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
47 struct net_device_stats *stats = netdev_priv(dev);
49 if (!netif_running(dev)) {
55 stats->rx_bytes += skb->len;
57 skb->protocol = htons(ETH_P_IP);
59 /* Spoof incoming device */
61 skb->mac.raw = skb->nh.raw;
62 skb->nh.raw = skb->data;
63 skb->pkt_type = PACKET_HOST;
72 static int nr_rebuild_header(struct sk_buff *skb)
74 unsigned char *bp = skb->data;
76 if (arp_find(bp + 7, skb))
81 bp[6] |= AX25_SSSID_SPARE;
86 bp[6] |= AX25_SSSID_SPARE;
93 static int nr_rebuild_header(struct sk_buff *skb)
100 static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
101 void *daddr, void *saddr, unsigned len)
103 unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
105 memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
106 buff[6] &= ~AX25_CBIT;
107 buff[6] &= ~AX25_EBIT;
108 buff[6] |= AX25_SSSID_SPARE;
109 buff += AX25_ADDR_LEN;
112 memcpy(buff, daddr, dev->addr_len);
113 buff[6] &= ~AX25_CBIT;
114 buff[6] |= AX25_EBIT;
115 buff[6] |= AX25_SSSID_SPARE;
116 buff += AX25_ADDR_LEN;
118 *buff++ = sysctl_netrom_network_ttl_initialiser;
120 *buff++ = NR_PROTO_IP;
121 *buff++ = NR_PROTO_IP;
124 *buff++ = NR_PROTOEXT;
132 static int nr_set_mac_address(struct net_device *dev, void *addr)
134 struct sockaddr *sa = addr;
136 if (dev->flags & IFF_UP)
137 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
139 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
141 if (dev->flags & IFF_UP)
142 ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
147 static int nr_open(struct net_device *dev)
149 netif_start_queue(dev);
150 ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
154 static int nr_close(struct net_device *dev)
156 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
157 netif_stop_queue(dev);
161 static int nr_xmit(struct sk_buff *skb, struct net_device *dev)
163 struct nr_private *nr = netdev_priv(dev);
164 struct net_device_stats *stats = &nr->stats;
165 unsigned int len = skb->len;
167 if (!nr_route_frame(skb, NULL)) {
174 stats->tx_bytes += len;
179 static struct net_device_stats *nr_get_stats(struct net_device *dev)
181 struct nr_private *nr = netdev_priv(dev);
186 void nr_setup(struct net_device *dev)
188 SET_MODULE_OWNER(dev);
189 dev->mtu = NR_MAX_PACKET_SIZE;
190 dev->hard_start_xmit = nr_xmit;
192 dev->stop = nr_close;
194 dev->hard_header = nr_header;
195 dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
196 dev->addr_len = AX25_ADDR_LEN;
197 dev->type = ARPHRD_NETROM;
198 dev->rebuild_header = nr_rebuild_header;
199 dev->set_mac_address = nr_set_mac_address;
201 /* New-style flags. */
202 dev->flags = IFF_NOARP;
204 dev->get_stats = nr_get_stats;