Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic HDLC support routines for Linux |
| 3 | * X.25 support |
| 4 | * |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame^] | 5 | * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of version 2 of the GNU General Public License |
| 9 | * as published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/poll.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/if_arp.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/skbuff.h> |
| 20 | #include <linux/pkt_sched.h> |
| 21 | #include <linux/inetdevice.h> |
| 22 | #include <linux/lapb.h> |
| 23 | #include <linux/rtnetlink.h> |
| 24 | #include <linux/hdlc.h> |
| 25 | |
| 26 | #include <net/x25device.h> |
| 27 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame^] | 28 | static int x25_ioctl(struct net_device *dev, struct ifreq *ifr); |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | /* These functions are callbacks called by LAPB layer */ |
| 31 | |
| 32 | static void x25_connect_disconnect(struct net_device *dev, int reason, int code) |
| 33 | { |
| 34 | struct sk_buff *skb; |
| 35 | unsigned char *ptr; |
| 36 | |
| 37 | if ((skb = dev_alloc_skb(1)) == NULL) { |
| 38 | printk(KERN_ERR "%s: out of memory\n", dev->name); |
| 39 | return; |
| 40 | } |
| 41 | |
| 42 | ptr = skb_put(skb, 1); |
| 43 | *ptr = code; |
| 44 | |
| 45 | skb->protocol = x25_type_trans(skb, dev); |
| 46 | netif_rx(skb); |
| 47 | } |
| 48 | |
| 49 | |
| 50 | |
| 51 | static void x25_connected(struct net_device *dev, int reason) |
| 52 | { |
| 53 | x25_connect_disconnect(dev, reason, 1); |
| 54 | } |
| 55 | |
| 56 | |
| 57 | |
| 58 | static void x25_disconnected(struct net_device *dev, int reason) |
| 59 | { |
| 60 | x25_connect_disconnect(dev, reason, 2); |
| 61 | } |
| 62 | |
| 63 | |
| 64 | |
| 65 | static int x25_data_indication(struct net_device *dev, struct sk_buff *skb) |
| 66 | { |
| 67 | unsigned char *ptr; |
| 68 | |
| 69 | skb_push(skb, 1); |
| 70 | |
| 71 | if (skb_cow(skb, 1)) |
| 72 | return NET_RX_DROP; |
| 73 | |
| 74 | ptr = skb->data; |
| 75 | *ptr = 0; |
| 76 | |
| 77 | skb->protocol = x25_type_trans(skb, dev); |
| 78 | return netif_rx(skb); |
| 79 | } |
| 80 | |
| 81 | |
| 82 | |
| 83 | static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb) |
| 84 | { |
| 85 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 86 | hdlc->xmit(skb, dev); /* Ignore return value :-( */ |
| 87 | } |
| 88 | |
| 89 | |
| 90 | |
| 91 | static int x25_xmit(struct sk_buff *skb, struct net_device *dev) |
| 92 | { |
| 93 | int result; |
| 94 | |
| 95 | |
| 96 | /* X.25 to LAPB */ |
| 97 | switch (skb->data[0]) { |
| 98 | case 0: /* Data to be transmitted */ |
| 99 | skb_pull(skb, 1); |
| 100 | if ((result = lapb_data_request(dev, skb)) != LAPB_OK) |
| 101 | dev_kfree_skb(skb); |
| 102 | return 0; |
| 103 | |
| 104 | case 1: |
| 105 | if ((result = lapb_connect_request(dev))!= LAPB_OK) { |
| 106 | if (result == LAPB_CONNECTED) |
| 107 | /* Send connect confirm. msg to level 3 */ |
| 108 | x25_connected(dev, 0); |
| 109 | else |
| 110 | printk(KERN_ERR "%s: LAPB connect request " |
| 111 | "failed, error code = %i\n", |
| 112 | dev->name, result); |
| 113 | } |
| 114 | break; |
| 115 | |
| 116 | case 2: |
| 117 | if ((result = lapb_disconnect_request(dev)) != LAPB_OK) { |
| 118 | if (result == LAPB_NOTCONNECTED) |
| 119 | /* Send disconnect confirm. msg to level 3 */ |
| 120 | x25_disconnected(dev, 0); |
| 121 | else |
| 122 | printk(KERN_ERR "%s: LAPB disconnect request " |
| 123 | "failed, error code = %i\n", |
| 124 | dev->name, result); |
| 125 | } |
| 126 | break; |
| 127 | |
| 128 | default: /* to be defined */ |
| 129 | break; |
| 130 | } |
| 131 | |
| 132 | dev_kfree_skb(skb); |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | |
| 137 | |
| 138 | static int x25_open(struct net_device *dev) |
| 139 | { |
| 140 | struct lapb_register_struct cb; |
| 141 | int result; |
| 142 | |
| 143 | cb.connect_confirmation = x25_connected; |
| 144 | cb.connect_indication = x25_connected; |
| 145 | cb.disconnect_confirmation = x25_disconnected; |
| 146 | cb.disconnect_indication = x25_disconnected; |
| 147 | cb.data_indication = x25_data_indication; |
| 148 | cb.data_transmit = x25_data_transmit; |
| 149 | |
| 150 | result = lapb_register(dev, &cb); |
| 151 | if (result != LAPB_OK) |
| 152 | return result; |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | |
| 157 | |
| 158 | static void x25_close(struct net_device *dev) |
| 159 | { |
| 160 | lapb_unregister(dev); |
| 161 | } |
| 162 | |
| 163 | |
| 164 | |
| 165 | static int x25_rx(struct sk_buff *skb) |
| 166 | { |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame^] | 167 | struct hdlc_device_desc *desc = dev_to_desc(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
| 169 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame^] | 170 | desc->stats.rx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | return NET_RX_DROP; |
| 172 | } |
| 173 | |
| 174 | if (lapb_data_received(skb->dev, skb) == LAPB_OK) |
| 175 | return NET_RX_SUCCESS; |
| 176 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame^] | 177 | desc->stats.rx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | dev_kfree_skb_any(skb); |
| 179 | return NET_RX_DROP; |
| 180 | } |
| 181 | |
| 182 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame^] | 183 | static struct hdlc_proto proto = { |
| 184 | .open = x25_open, |
| 185 | .close = x25_close, |
| 186 | .ioctl = x25_ioctl, |
| 187 | .module = THIS_MODULE, |
| 188 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame^] | 190 | |
| 191 | static int x25_ioctl(struct net_device *dev, struct ifreq *ifr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | { |
| 193 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 194 | int result; |
| 195 | |
| 196 | switch (ifr->ifr_settings.type) { |
| 197 | case IF_GET_PROTO: |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame^] | 198 | if (dev_to_hdlc(dev)->proto != &proto) |
| 199 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | ifr->ifr_settings.type = IF_PROTO_X25; |
| 201 | return 0; /* return protocol only, no settable parameters */ |
| 202 | |
| 203 | case IF_PROTO_X25: |
| 204 | if(!capable(CAP_NET_ADMIN)) |
| 205 | return -EPERM; |
| 206 | |
| 207 | if(dev->flags & IFF_UP) |
| 208 | return -EBUSY; |
| 209 | |
| 210 | result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); |
| 211 | if (result) |
| 212 | return result; |
| 213 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame^] | 214 | if ((result = attach_hdlc_protocol(dev, &proto, |
| 215 | x25_rx, 0)) != 0) |
| 216 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | dev->hard_start_xmit = x25_xmit; |
| 218 | dev->hard_header = NULL; |
| 219 | dev->type = ARPHRD_X25; |
| 220 | dev->addr_len = 0; |
Krzysztof Halasa | 4bc83b4 | 2006-07-21 14:41:01 -0700 | [diff] [blame] | 221 | netif_dormant_off(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | return -EINVAL; |
| 226 | } |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame^] | 227 | |
| 228 | |
| 229 | static int __init mod_init(void) |
| 230 | { |
| 231 | register_hdlc_protocol(&proto); |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | |
| 236 | |
| 237 | static void __exit mod_exit(void) |
| 238 | { |
| 239 | unregister_hdlc_protocol(&proto); |
| 240 | } |
| 241 | |
| 242 | |
| 243 | module_init(mod_init); |
| 244 | module_exit(mod_exit); |
| 245 | |
| 246 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); |
| 247 | MODULE_DESCRIPTION("X.25 protocol support for generic HDLC"); |
| 248 | MODULE_LICENSE("GPL v2"); |