| 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/system.h> |
| 25 | #include <asm/io.h> |
| 26 | |
| 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> |
| 32 | |
| 33 | #include <net/ip.h> |
| 34 | #include <net/arp.h> |
| 35 | |
| 36 | #include <net/ax25.h> |
| 37 | #include <net/rose.h> |
| 38 | |
| 39 | static int rose_header(struct sk_buff *skb, struct net_device *dev, |
| 40 | unsigned short type, |
| 41 | const void *daddr, const void *saddr, unsigned len) |
| 42 | { |
| 43 | unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2); |
| 44 | |
| 45 | *buff++ = ROSE_GFI | ROSE_Q_BIT; |
| 46 | *buff++ = 0x00; |
| 47 | *buff++ = ROSE_DATA; |
| 48 | *buff++ = 0x7F; |
| 49 | *buff++ = AX25_P_IP; |
| 50 | |
| 51 | if (daddr != NULL) |
| 52 | return 37; |
| 53 | |
| 54 | return -37; |
| 55 | } |
| 56 | |
| 57 | static int rose_rebuild_header(struct sk_buff *skb) |
| 58 | { |
| 59 | #ifdef CONFIG_INET |
| 60 | struct net_device *dev = skb->dev; |
| 61 | struct net_device_stats *stats = &dev->stats; |
| 62 | unsigned char *bp = (unsigned char *)skb->data; |
| 63 | struct sk_buff *skbn; |
| 64 | unsigned int len; |
| 65 | |
| 66 | if (arp_find(bp + 7, skb)) { |
| 67 | return 1; |
| 68 | } |
| 69 | |
| 70 | if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) { |
| 71 | kfree_skb(skb); |
| 72 | return 1; |
| 73 | } |
| 74 | |
| 75 | if (skb->sk != NULL) |
| 76 | skb_set_owner_w(skbn, skb->sk); |
| 77 | |
| 78 | kfree_skb(skb); |
| 79 | |
| 80 | len = skbn->len; |
| 81 | |
| 82 | if (!rose_route_frame(skbn, NULL)) { |
| 83 | kfree_skb(skbn); |
| 84 | stats->tx_errors++; |
| 85 | return 1; |
| 86 | } |
| 87 | |
| 88 | stats->tx_packets++; |
| 89 | stats->tx_bytes += len; |
| 90 | #endif |
| 91 | return 1; |
| 92 | } |
| 93 | |
| 94 | static int rose_set_mac_address(struct net_device *dev, void *addr) |
| 95 | { |
| 96 | struct sockaddr *sa = addr; |
| 97 | int err; |
| 98 | |
| 99 | if (!memcpy(dev->dev_addr, sa->sa_data, dev->addr_len)) |
| 100 | return 0; |
| 101 | |
| 102 | if (dev->flags & IFF_UP) { |
| 103 | err = rose_add_loopback_node((rose_address *)dev->dev_addr); |
| 104 | if (err) |
| 105 | return err; |
| 106 | |
| 107 | rose_del_loopback_node((rose_address *)dev->dev_addr); |
| 108 | } |
| 109 | |
| 110 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static int rose_open(struct net_device *dev) |
| 116 | { |
| 117 | int err; |
| 118 | |
| 119 | err = rose_add_loopback_node((rose_address *)dev->dev_addr); |
| 120 | if (err) |
| 121 | return err; |
| 122 | |
| 123 | netif_start_queue(dev); |
| 124 | |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | static int rose_close(struct net_device *dev) |
| 129 | { |
| 130 | netif_stop_queue(dev); |
| 131 | rose_del_loopback_node((rose_address *)dev->dev_addr); |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev) |
| 136 | { |
| 137 | struct net_device_stats *stats = &dev->stats; |
| 138 | |
| 139 | if (!netif_running(dev)) { |
| 140 | printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n"); |
| 141 | return NETDEV_TX_BUSY; |
| 142 | } |
| 143 | dev_kfree_skb(skb); |
| 144 | stats->tx_errors++; |
| 145 | return NETDEV_TX_OK; |
| 146 | } |
| 147 | |
| 148 | static const struct header_ops rose_header_ops = { |
| 149 | .create = rose_header, |
| 150 | .rebuild= rose_rebuild_header, |
| 151 | }; |
| 152 | |
| 153 | static const struct net_device_ops rose_netdev_ops = { |
| 154 | .ndo_open = rose_open, |
| 155 | .ndo_stop = rose_close, |
| 156 | .ndo_start_xmit = rose_xmit, |
| 157 | .ndo_set_mac_address = rose_set_mac_address, |
| 158 | }; |
| 159 | |
| 160 | void rose_setup(struct net_device *dev) |
| 161 | { |
| 162 | dev->mtu = ROSE_MAX_PACKET_SIZE - 2; |
| 163 | dev->netdev_ops = &rose_netdev_ops; |
| 164 | |
| 165 | dev->header_ops = &rose_header_ops; |
| 166 | dev->hard_header_len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN; |
| 167 | dev->addr_len = ROSE_ADDR_LEN; |
| 168 | dev->type = ARPHRD_ROSE; |
| 169 | |
| 170 | /* New-style flags. */ |
| 171 | dev->flags = IFF_NOARP; |
| 172 | } |