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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/errno.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 13 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/hdlc.h> |
Krzysztof Hałasa | 4dfce40 | 2008-06-30 19:06:40 +0200 | [diff] [blame] | 15 | #include <linux/if_arp.h> |
| 16 | #include <linux/inetdevice.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/lapb.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/pkt_sched.h> |
| 22 | #include <linux/poll.h> |
| 23 | #include <linux/rtnetlink.h> |
| 24 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <net/x25device.h> |
| 26 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 27 | static int x25_ioctl(struct net_device *dev, struct ifreq *ifr); |
| 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | /* These functions are callbacks called by LAPB layer */ |
| 30 | |
| 31 | static void x25_connect_disconnect(struct net_device *dev, int reason, int code) |
| 32 | { |
| 33 | struct sk_buff *skb; |
| 34 | unsigned char *ptr; |
| 35 | |
| 36 | if ((skb = dev_alloc_skb(1)) == NULL) { |
Joe Perches | 12a3bfe | 2011-06-26 19:01:28 +0000 | [diff] [blame] | 37 | netdev_err(dev, "out of memory\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | return; |
| 39 | } |
| 40 | |
| 41 | ptr = skb_put(skb, 1); |
| 42 | *ptr = code; |
| 43 | |
| 44 | skb->protocol = x25_type_trans(skb, dev); |
| 45 | netif_rx(skb); |
| 46 | } |
| 47 | |
| 48 | |
| 49 | |
| 50 | static void x25_connected(struct net_device *dev, int reason) |
| 51 | { |
andrew hendry | 90b3e03 | 2010-04-19 13:30:24 +0000 | [diff] [blame] | 52 | x25_connect_disconnect(dev, reason, X25_IFACE_CONNECT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | } |
| 54 | |
| 55 | |
| 56 | |
| 57 | static void x25_disconnected(struct net_device *dev, int reason) |
| 58 | { |
andrew hendry | 90b3e03 | 2010-04-19 13:30:24 +0000 | [diff] [blame] | 59 | x25_connect_disconnect(dev, reason, X25_IFACE_DISCONNECT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | |
| 63 | |
| 64 | static int x25_data_indication(struct net_device *dev, struct sk_buff *skb) |
| 65 | { |
| 66 | unsigned char *ptr; |
| 67 | |
| 68 | skb_push(skb, 1); |
| 69 | |
| 70 | if (skb_cow(skb, 1)) |
| 71 | return NET_RX_DROP; |
| 72 | |
| 73 | ptr = skb->data; |
andrew hendry | 90b3e03 | 2010-04-19 13:30:24 +0000 | [diff] [blame] | 74 | *ptr = X25_IFACE_DATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | skb->protocol = x25_type_trans(skb, dev); |
| 77 | return netif_rx(skb); |
| 78 | } |
| 79 | |
| 80 | |
| 81 | |
| 82 | static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb) |
| 83 | { |
| 84 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 85 | hdlc->xmit(skb, dev); /* Ignore return value :-( */ |
| 86 | } |
| 87 | |
| 88 | |
| 89 | |
Stephen Hemminger | d71a674 | 2009-08-31 19:50:47 +0000 | [diff] [blame] | 90 | static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | { |
| 92 | int result; |
| 93 | |
| 94 | |
| 95 | /* X.25 to LAPB */ |
| 96 | switch (skb->data[0]) { |
andrew hendry | 90b3e03 | 2010-04-19 13:30:24 +0000 | [diff] [blame] | 97 | case X25_IFACE_DATA: /* Data to be transmitted */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | skb_pull(skb, 1); |
| 99 | if ((result = lapb_data_request(dev, skb)) != LAPB_OK) |
| 100 | dev_kfree_skb(skb); |
Stephen Hemminger | d71a674 | 2009-08-31 19:50:47 +0000 | [diff] [blame] | 101 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
andrew hendry | 90b3e03 | 2010-04-19 13:30:24 +0000 | [diff] [blame] | 103 | case X25_IFACE_CONNECT: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | if ((result = lapb_connect_request(dev))!= LAPB_OK) { |
| 105 | if (result == LAPB_CONNECTED) |
| 106 | /* Send connect confirm. msg to level 3 */ |
| 107 | x25_connected(dev, 0); |
| 108 | else |
Joe Perches | 12a3bfe | 2011-06-26 19:01:28 +0000 | [diff] [blame] | 109 | netdev_err(dev, "LAPB connect request failed, error code = %i\n", |
| 110 | result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | } |
| 112 | break; |
| 113 | |
andrew hendry | 90b3e03 | 2010-04-19 13:30:24 +0000 | [diff] [blame] | 114 | case X25_IFACE_DISCONNECT: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | if ((result = lapb_disconnect_request(dev)) != LAPB_OK) { |
| 116 | if (result == LAPB_NOTCONNECTED) |
| 117 | /* Send disconnect confirm. msg to level 3 */ |
| 118 | x25_disconnected(dev, 0); |
| 119 | else |
Joe Perches | 12a3bfe | 2011-06-26 19:01:28 +0000 | [diff] [blame] | 120 | netdev_err(dev, "LAPB disconnect request failed, error code = %i\n", |
| 121 | result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | break; |
| 124 | |
| 125 | default: /* to be defined */ |
| 126 | break; |
| 127 | } |
| 128 | |
| 129 | dev_kfree_skb(skb); |
Stephen Hemminger | d71a674 | 2009-08-31 19:50:47 +0000 | [diff] [blame] | 130 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | |
| 134 | |
| 135 | static int x25_open(struct net_device *dev) |
| 136 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | int result; |
stephen hemminger | d97a077 | 2011-09-16 11:04:29 +0000 | [diff] [blame^] | 138 | static const struct lapb_register_struct cb = { |
| 139 | .connect_confirmation = x25_connected, |
| 140 | .connect_indication = x25_connected, |
| 141 | .disconnect_confirmation = x25_disconnected, |
| 142 | .disconnect_indication = x25_disconnected, |
| 143 | .data_indication = x25_data_indication, |
| 144 | .data_transmit = x25_data_transmit, |
| 145 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
| 147 | result = lapb_register(dev, &cb); |
| 148 | if (result != LAPB_OK) |
| 149 | return result; |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | |
| 154 | |
| 155 | static void x25_close(struct net_device *dev) |
| 156 | { |
| 157 | lapb_unregister(dev); |
| 158 | } |
| 159 | |
| 160 | |
| 161 | |
| 162 | static int x25_rx(struct sk_buff *skb) |
| 163 | { |
Krzysztof Halasa | 5406951 | 2008-09-03 18:21:56 +0200 | [diff] [blame] | 164 | struct net_device *dev = skb->dev; |
| 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { |
Krzysztof Halasa | 5406951 | 2008-09-03 18:21:56 +0200 | [diff] [blame] | 167 | dev->stats.rx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | return NET_RX_DROP; |
| 169 | } |
| 170 | |
Krzysztof Halasa | 5406951 | 2008-09-03 18:21:56 +0200 | [diff] [blame] | 171 | if (lapb_data_received(dev, skb) == LAPB_OK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | return NET_RX_SUCCESS; |
| 173 | |
Krzysztof Halasa | 5406951 | 2008-09-03 18:21:56 +0200 | [diff] [blame] | 174 | dev->stats.rx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | dev_kfree_skb_any(skb); |
| 176 | return NET_RX_DROP; |
| 177 | } |
| 178 | |
| 179 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 180 | static struct hdlc_proto proto = { |
| 181 | .open = x25_open, |
| 182 | .close = x25_close, |
| 183 | .ioctl = x25_ioctl, |
Krzysztof Halasa | 40d2514 | 2008-02-01 22:37:12 +0100 | [diff] [blame] | 184 | .netif_rx = x25_rx, |
Krzysztof Hałasa | 991990a | 2009-01-08 22:52:11 +0100 | [diff] [blame] | 185 | .xmit = x25_xmit, |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 186 | .module = THIS_MODULE, |
| 187 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 189 | |
| 190 | static int x25_ioctl(struct net_device *dev, struct ifreq *ifr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | { |
| 192 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 193 | int result; |
| 194 | |
| 195 | switch (ifr->ifr_settings.type) { |
| 196 | case IF_GET_PROTO: |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 197 | if (dev_to_hdlc(dev)->proto != &proto) |
| 198 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | ifr->ifr_settings.type = IF_PROTO_X25; |
| 200 | return 0; /* return protocol only, no settable parameters */ |
| 201 | |
| 202 | case IF_PROTO_X25: |
Rudy Matela | 640462c | 2009-12-09 11:35:40 -0300 | [diff] [blame] | 203 | if (!capable(CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | return -EPERM; |
| 205 | |
Rudy Matela | 640462c | 2009-12-09 11:35:40 -0300 | [diff] [blame] | 206 | if (dev->flags & IFF_UP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | return -EBUSY; |
| 208 | |
| 209 | result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); |
| 210 | if (result) |
| 211 | return result; |
| 212 | |
Krzysztof Halasa | 40d2514 | 2008-02-01 22:37:12 +0100 | [diff] [blame] | 213 | if ((result = attach_hdlc_protocol(dev, &proto, 0))) |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 214 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | dev->type = ARPHRD_X25; |
Krzysztof Halasa | 4bc83b4 | 2006-07-21 14:41:01 -0700 | [diff] [blame] | 216 | netif_dormant_off(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | return -EINVAL; |
| 221 | } |
Krzysztof Halasa | eb2a2fd | 2006-09-26 23:23:45 +0200 | [diff] [blame] | 222 | |
| 223 | |
| 224 | static int __init mod_init(void) |
| 225 | { |
| 226 | register_hdlc_protocol(&proto); |
| 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | |
| 231 | |
| 232 | static void __exit mod_exit(void) |
| 233 | { |
| 234 | unregister_hdlc_protocol(&proto); |
| 235 | } |
| 236 | |
| 237 | |
| 238 | module_init(mod_init); |
| 239 | module_exit(mod_exit); |
| 240 | |
| 241 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); |
| 242 | MODULE_DESCRIPTION("X.25 protocol support for generic HDLC"); |
| 243 | MODULE_LICENSE("GPL v2"); |