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/interrupt.h>
14 #include <linux/types.h>
15 #include <linux/sysctl.h>
16 #include <linux/string.h>
17 #include <linux/socket.h>
18 #include <linux/errno.h>
19 #include <linux/fcntl.h>
21 #include <linux/if_ether.h> /* For the statistics structure. */
23 #include <asm/system.h>
24 #include <asm/uaccess.h>
27 #include <linux/inet.h>
28 #include <linux/netdevice.h>
29 #include <linux/etherdevice.h>
30 #include <linux/if_arp.h>
31 #include <linux/skbuff.h>
37 #include <net/netrom.h>
40 * Only allow IP over NET/ROM frames through if the netrom device is up.
43 int nr_rx_ip(struct sk_buff *skb, struct net_device *dev)
45 struct net_device_stats *stats = netdev_priv(dev);
47 if (!netif_running(dev)) {
53 stats->rx_bytes += skb->len;
55 skb->protocol = htons(ETH_P_IP);
57 /* Spoof incoming device */
59 skb->mac.raw = skb->nh.raw;
60 skb->nh.raw = skb->data;
61 skb->pkt_type = PACKET_HOST;
70 static int nr_rebuild_header(struct sk_buff *skb)
72 unsigned char *bp = skb->data;
74 if (arp_find(bp + 7, skb))
79 bp[6] |= AX25_SSSID_SPARE;
84 bp[6] |= AX25_SSSID_SPARE;
91 static int nr_rebuild_header(struct sk_buff *skb)
98 static int nr_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
99 void *daddr, void *saddr, unsigned len)
101 unsigned char *buff = skb_push(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
103 memcpy(buff, (saddr != NULL) ? saddr : dev->dev_addr, dev->addr_len);
104 buff[6] &= ~AX25_CBIT;
105 buff[6] &= ~AX25_EBIT;
106 buff[6] |= AX25_SSSID_SPARE;
107 buff += AX25_ADDR_LEN;
110 memcpy(buff, daddr, dev->addr_len);
111 buff[6] &= ~AX25_CBIT;
112 buff[6] |= AX25_EBIT;
113 buff[6] |= AX25_SSSID_SPARE;
114 buff += AX25_ADDR_LEN;
116 *buff++ = sysctl_netrom_network_ttl_initialiser;
118 *buff++ = NR_PROTO_IP;
119 *buff++ = NR_PROTO_IP;
122 *buff++ = NR_PROTOEXT;
130 static int __must_check nr_set_mac_address(struct net_device *dev, void *addr)
132 struct sockaddr *sa = addr;
135 if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
138 if (dev->flags & IFF_UP) {
139 err = ax25_listen_register((ax25_address *)sa->sa_data, NULL);
143 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
146 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
151 static int nr_open(struct net_device *dev)
155 err = ax25_listen_register((ax25_address *)dev->dev_addr, NULL);
159 netif_start_queue(dev);
164 static int nr_close(struct net_device *dev)
166 ax25_listen_release((ax25_address *)dev->dev_addr, NULL);
167 netif_stop_queue(dev);
171 static int nr_xmit(struct sk_buff *skb, struct net_device *dev)
173 struct nr_private *nr = netdev_priv(dev);
174 struct net_device_stats *stats = &nr->stats;
175 unsigned int len = skb->len;
177 if (!nr_route_frame(skb, NULL)) {
184 stats->tx_bytes += len;
189 static struct net_device_stats *nr_get_stats(struct net_device *dev)
191 struct nr_private *nr = netdev_priv(dev);
196 void nr_setup(struct net_device *dev)
198 dev->mtu = NR_MAX_PACKET_SIZE;
199 dev->hard_start_xmit = nr_xmit;
201 dev->stop = nr_close;
203 dev->hard_header = nr_header;
204 dev->hard_header_len = NR_NETWORK_LEN + NR_TRANSPORT_LEN;
205 dev->addr_len = AX25_ADDR_LEN;
206 dev->type = ARPHRD_NETROM;
207 dev->rebuild_header = nr_rebuild_header;
208 dev->set_mac_address = nr_set_mac_address;
210 /* New-style flags. */
211 dev->flags = IFF_NOARP;
213 dev->get_stats = nr_get_stats;