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/module.h>
10 #include <linux/proc_fs.h>
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
13 #include <linux/interrupt.h>
15 #include <linux/types.h>
16 #include <linux/sysctl.h>
17 #include <linux/string.h>
18 #include <linux/socket.h>
19 #include <linux/errno.h>
20 #include <linux/fcntl.h>
22 #include <linux/if_ether.h> /* For the statistics structure. */
24 #include <asm/system.h>
25 #include <asm/uaccess.h>
28 #include <linux/inet.h>
29 #include <linux/netdevice.h>
30 #include <linux/etherdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/skbuff.h>
38 #include <net/netrom.h>
41 * Only allow IP over NET/ROM frames through if the netrom device is up.
44 int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
46 struct net_device_stats *stats = netdev_priv(dev);
48 if (!netif_running(dev)) {
54 stats->rx_bytes += skb->len;
56 skb->protocol = htons(ETH_P_IP);
58 /* Spoof incoming device */
60 skb->mac.raw = skb->nh.raw;
61 skb->nh.raw = skb->data;
62 skb->pkt_type = PACKET_HOST;
71 static int nr_rebuild_header(struct sk_buff *skb)
73 unsigned char *bp = skb->data;
75 if (arp_find(bp + 7, skb))
80 bp[6] |= AX25_SSSID_SPARE;
85 bp[6] |= AX25_SSSID_SPARE;
92 static int nr_rebuild_header(struct sk_buff *skb)
99 static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
100 void *daddr, void *saddr, unsigned len)
102 unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
104 memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
105 buff[6] &= ~AX25_CBIT;
106 buff[6] &= ~AX25_EBIT;
107 buff[6] |= AX25_SSSID_SPARE;
108 buff += AX25_ADDR_LEN;
111 memcpy(buff, daddr, dev->addr_len);
112 buff[6] &= ~AX25_CBIT;
113 buff[6] |= AX25_EBIT;
114 buff[6] |= AX25_SSSID_SPARE;
115 buff += AX25_ADDR_LEN;
117 *buff++ = sysctl_netrom_network_ttl_initialiser;
119 *buff++ = NR_PROTO_IP;
120 *buff++ = NR_PROTO_IP;
123 *buff++ = NR_PROTOEXT;
131 static int __must_check nr_set_mac_address(struct net_device *dev, void *addr)
133 struct sockaddr *sa = addr;
136 if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
139 if (dev->flags & IFF_UP) {
140 err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
144 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
147 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
152 static int nr_open(struct net_device *dev)
156 err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
160 netif_start_queue(dev);
165 static int nr_close(struct net_device *dev)
167 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
168 netif_stop_queue(dev);
172 static int nr_xmit(struct sk_buff *skb, struct net_device *dev)
174 struct nr_private *nr = netdev_priv(dev);
175 struct net_device_stats *stats = &nr->stats;
176 unsigned int len = skb->len;
178 if (!nr_route_frame(skb, NULL)) {
185 stats->tx_bytes += len;
190 static struct net_device_stats *nr_get_stats(struct net_device *dev)
192 struct nr_private *nr = netdev_priv(dev);
197 void nr_setup(struct net_device *dev)
199 dev->mtu = NR_MAX_PACKET_SIZE;
200 dev->hard_start_xmit = nr_xmit;
202 dev->stop = nr_close;
204 dev->hard_header = nr_header;
205 dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
206 dev->addr_len = AX25_ADDR_LEN;
207 dev->type = ARPHRD_NETROM;
208 dev->rebuild_header = nr_rebuild_header;
209 dev->set_mac_address = nr_set_mac_address;
211 /* New-style flags. */
212 dev->flags = IFF_NOARP;
214 dev->get_stats = nr_get_stats;