1 /* 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. 6 * 7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 8 */ 9 #include <linux/module.h> 10 #include <linux/proc_fs.h> 11 #include <linux/kernel.h> 12 #include <linux/interrupt.h> 13 #include <linux/fs.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> 20 #include <linux/in.h> 21 #include <linux/if_ether.h> 22 #include <linux/slab.h> 23 24 #include <asm/io.h> 25 26 #include <linux/inet.h> 27 #include <linux/netdevice.h> 28 #include <linux/etherdevice.h> 29 #include <linux/if_arp.h> 30 #include <linux/skbuff.h> 31 32 #include <net/ip.h> 33 #include <net/arp.h> 34 35 #include <net/ax25.h> 36 #include <net/rose.h> 37 38 static int rose_header(struct sk_buff *skb, struct net_device *dev, 39 unsigned short type, 40 const void *daddr, const void *saddr, unsigned int len) 41 { 42 unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2); 43 44 if (daddr) 45 memcpy(buff + 7, daddr, dev->addr_len); 46 47 *buff++ = ROSE_GFI | ROSE_Q_BIT; 48 *buff++ = 0x00; 49 *buff++ = ROSE_DATA; 50 *buff++ = 0x7F; 51 *buff++ = AX25_P_IP; 52 53 if (daddr != NULL) 54 return 37; 55 56 return -37; 57 } 58 59 static int rose_set_mac_address(struct net_device *dev, void *addr) 60 { 61 struct sockaddr *sa = addr; 62 int err; 63 64 if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len)) 65 return 0; 66 67 if (dev->flags & IFF_UP) { 68 err = rose_add_loopback_node((rose_address *)sa->sa_data); 69 if (err) 70 return err; 71 72 rose_del_loopback_node((rose_address *)dev->dev_addr); 73 } 74 75 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 76 77 return 0; 78 } 79 80 static int rose_open(struct net_device *dev) 81 { 82 int err; 83 84 err = rose_add_loopback_node((rose_address *)dev->dev_addr); 85 if (err) 86 return err; 87 88 netif_start_queue(dev); 89 90 return 0; 91 } 92 93 static int rose_close(struct net_device *dev) 94 { 95 netif_stop_queue(dev); 96 rose_del_loopback_node((rose_address *)dev->dev_addr); 97 return 0; 98 } 99 100 static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev) 101 { 102 struct net_device_stats *stats = &dev->stats; 103 unsigned int len = skb->len; 104 105 if (!netif_running(dev)) { 106 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n"); 107 return NETDEV_TX_BUSY; 108 } 109 110 if (!rose_route_frame(skb, NULL)) { 111 dev_kfree_skb(skb); 112 stats->tx_errors++; 113 return NETDEV_TX_OK; 114 } 115 116 stats->tx_packets++; 117 stats->tx_bytes += len; 118 return NETDEV_TX_OK; 119 } 120 121 static const struct header_ops rose_header_ops = { 122 .create = rose_header, 123 }; 124 125 static const struct net_device_ops rose_netdev_ops = { 126 .ndo_open = rose_open, 127 .ndo_stop = rose_close, 128 .ndo_start_xmit = rose_xmit, 129 .ndo_set_mac_address = rose_set_mac_address, 130 }; 131 132 void rose_setup(struct net_device *dev) 133 { 134 dev->mtu = ROSE_MAX_PACKET_SIZE - 2; 135 dev->netdev_ops = &rose_netdev_ops; 136 137 dev->header_ops = &rose_header_ops; 138 dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; 139 dev->addr_len = ROSE_ADDR_LEN; 140 dev->type = ARPHRD_ROSE; 141 142 /* New-style flags. */ 143 dev->flags = IFF_NOARP; 144 } 145