Thomas Gleixner | 09c434b | 2019-05-19 13:08:20 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Things to sort out: |
| 4 | * |
| 5 | * o tbusy handling |
| 6 | * o allow users to set the parameters |
| 7 | * o sync/async switching ? |
| 8 | * |
| 9 | * Note: This does _not_ implement CCITT X.25 asynchronous framing |
| 10 | * recommendations. Its primarily for testing purposes. If you wanted |
| 11 | * to do CCITT then in theory all you need is to nick the HDLC async |
| 12 | * checksum routines from ppp.c |
| 13 | * Changes: |
| 14 | * |
| 15 | * 2000-10-29 Henner Eisen lapb_data_indication() return status. |
| 16 | */ |
| 17 | |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/module.h> |
| 21 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 22 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/bitops.h> |
| 24 | #include <linux/string.h> |
| 25 | #include <linux/mm.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/in.h> |
| 28 | #include <linux/tty.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/netdevice.h> |
| 31 | #include <linux/etherdevice.h> |
| 32 | #include <linux/skbuff.h> |
| 33 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/lapb.h> |
| 35 | #include <linux/init.h> |
Ben Hutchings | 3e3cda9 | 2008-05-06 19:41:48 +0100 | [diff] [blame] | 36 | #include <linux/rtnetlink.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 37 | #include <linux/slab.h> |
andrew hendry | 7eeeacf0 | 2010-04-19 13:29:47 +0000 | [diff] [blame] | 38 | #include <net/x25device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include "x25_asy.h" |
| 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | static struct net_device **x25_asy_devs; |
| 42 | static int x25_asy_maxdev = SL_NRUNIT; |
| 43 | |
| 44 | module_param(x25_asy_maxdev, int, 0); |
| 45 | MODULE_LICENSE("GPL"); |
| 46 | |
| 47 | static int x25_asy_esc(unsigned char *p, unsigned char *d, int len); |
| 48 | static void x25_asy_unesc(struct x25_asy *sl, unsigned char c); |
| 49 | static void x25_asy_setup(struct net_device *dev); |
| 50 | |
| 51 | /* Find a free X.25 channel, and link in this `tty' line. */ |
| 52 | static struct x25_asy *x25_asy_alloc(void) |
| 53 | { |
| 54 | struct net_device *dev = NULL; |
| 55 | struct x25_asy *sl; |
| 56 | int i; |
| 57 | |
| 58 | if (x25_asy_devs == NULL) |
| 59 | return NULL; /* Master array missing ! */ |
| 60 | |
| 61 | for (i = 0; i < x25_asy_maxdev; i++) { |
| 62 | dev = x25_asy_devs[i]; |
| 63 | |
| 64 | /* Not allocated ? */ |
| 65 | if (dev == NULL) |
| 66 | break; |
| 67 | |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 68 | sl = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | /* Not in use ? */ |
| 70 | if (!test_and_set_bit(SLF_INUSE, &sl->flags)) |
| 71 | return sl; |
| 72 | } |
| 73 | |
| 74 | |
| 75 | /* Sorry, too many, all slots in use */ |
| 76 | if (i >= x25_asy_maxdev) |
| 77 | return NULL; |
| 78 | |
| 79 | /* If no channels are available, allocate one */ |
| 80 | if (!dev) { |
| 81 | char name[IFNAMSIZ]; |
| 82 | sprintf(name, "x25asy%d", i); |
| 83 | |
Tom Gundersen | c835a67 | 2014-07-14 16:37:24 +0200 | [diff] [blame] | 84 | dev = alloc_netdev(sizeof(struct x25_asy), name, |
| 85 | NET_NAME_UNKNOWN, x25_asy_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | if (!dev) |
| 87 | return NULL; |
| 88 | |
| 89 | /* Initialize channel control data */ |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 90 | sl = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | dev->base_addr = i; |
| 92 | |
| 93 | /* register device so that it can be ifconfig'ed */ |
| 94 | if (register_netdev(dev) == 0) { |
| 95 | /* (Re-)Set the INUSE bit. Very Important! */ |
| 96 | set_bit(SLF_INUSE, &sl->flags); |
| 97 | x25_asy_devs[i] = dev; |
| 98 | return sl; |
| 99 | } else { |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 100 | pr_warn("%s(): register_netdev() failure\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | free_netdev(dev); |
| 102 | } |
| 103 | } |
| 104 | return NULL; |
| 105 | } |
| 106 | |
| 107 | |
| 108 | /* Free an X.25 channel. */ |
| 109 | static void x25_asy_free(struct x25_asy *sl) |
| 110 | { |
| 111 | /* Free all X.25 frame buffers. */ |
Jesper Juhl | 6a5d362 | 2005-05-03 14:33:27 -0700 | [diff] [blame] | 112 | kfree(sl->rbuff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | sl->rbuff = NULL; |
Jesper Juhl | 6a5d362 | 2005-05-03 14:33:27 -0700 | [diff] [blame] | 114 | kfree(sl->xbuff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | sl->xbuff = NULL; |
| 116 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 117 | if (!test_and_clear_bit(SLF_INUSE, &sl->flags)) |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 118 | netdev_err(sl->dev, "x25_asy_free for already free unit\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | static int x25_asy_change_mtu(struct net_device *dev, int newmtu) |
| 122 | { |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 123 | struct x25_asy *sl = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | unsigned char *xbuff, *rbuff; |
Dan Carpenter | a28d0e8 | 2014-07-17 13:50:45 +0300 | [diff] [blame] | 125 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Dan Carpenter | a28d0e8 | 2014-07-17 13:50:45 +0300 | [diff] [blame] | 127 | len = 2 * newmtu; |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 128 | xbuff = kmalloc(len + 4, GFP_ATOMIC); |
| 129 | rbuff = kmalloc(len + 4, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 131 | if (xbuff == NULL || rbuff == NULL) { |
Jesper Juhl | 6a5d362 | 2005-05-03 14:33:27 -0700 | [diff] [blame] | 132 | kfree(xbuff); |
| 133 | kfree(rbuff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | return -ENOMEM; |
| 135 | } |
| 136 | |
| 137 | spin_lock_bh(&sl->lock); |
| 138 | xbuff = xchg(&sl->xbuff, xbuff); |
| 139 | if (sl->xleft) { |
| 140 | if (sl->xleft <= len) { |
| 141 | memcpy(sl->xbuff, sl->xhead, sl->xleft); |
| 142 | } else { |
| 143 | sl->xleft = 0; |
Stephen Hemminger | 6a8eba3 | 2009-03-20 19:36:12 +0000 | [diff] [blame] | 144 | dev->stats.tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | } |
| 146 | } |
| 147 | sl->xhead = sl->xbuff; |
| 148 | |
| 149 | rbuff = xchg(&sl->rbuff, rbuff); |
| 150 | if (sl->rcount) { |
| 151 | if (sl->rcount <= len) { |
| 152 | memcpy(sl->rbuff, rbuff, sl->rcount); |
| 153 | } else { |
| 154 | sl->rcount = 0; |
Stephen Hemminger | 6a8eba3 | 2009-03-20 19:36:12 +0000 | [diff] [blame] | 155 | dev->stats.rx_over_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | set_bit(SLF_ERROR, &sl->flags); |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | dev->mtu = newmtu; |
| 161 | sl->buffsize = len; |
| 162 | |
| 163 | spin_unlock_bh(&sl->lock); |
| 164 | |
Jesper Juhl | 6a5d362 | 2005-05-03 14:33:27 -0700 | [diff] [blame] | 165 | kfree(xbuff); |
| 166 | kfree(rbuff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | |
| 171 | /* Set the "sending" flag. This must be atomic, hence the ASM. */ |
| 172 | |
| 173 | static inline void x25_asy_lock(struct x25_asy *sl) |
| 174 | { |
| 175 | netif_stop_queue(sl->dev); |
| 176 | } |
| 177 | |
| 178 | |
| 179 | /* Clear the "sending" flag. This must be atomic, hence the ASM. */ |
| 180 | |
| 181 | static inline void x25_asy_unlock(struct x25_asy *sl) |
| 182 | { |
| 183 | netif_wake_queue(sl->dev); |
| 184 | } |
| 185 | |
| 186 | /* Send one completely decapsulated IP datagram to the IP layer. */ |
| 187 | |
| 188 | static void x25_asy_bump(struct x25_asy *sl) |
| 189 | { |
Stephen Hemminger | 6a8eba3 | 2009-03-20 19:36:12 +0000 | [diff] [blame] | 190 | struct net_device *dev = sl->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | struct sk_buff *skb; |
| 192 | int count; |
| 193 | int err; |
| 194 | |
| 195 | count = sl->rcount; |
Stephen Hemminger | 6a8eba3 | 2009-03-20 19:36:12 +0000 | [diff] [blame] | 196 | dev->stats.rx_bytes += count; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | skb = dev_alloc_skb(count+1); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 199 | if (skb == NULL) { |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 200 | netdev_warn(sl->dev, "memory squeeze, dropping packet\n"); |
Stephen Hemminger | 6a8eba3 | 2009-03-20 19:36:12 +0000 | [diff] [blame] | 201 | dev->stats.rx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | return; |
| 203 | } |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 204 | skb_push(skb, 1); /* LAPB internal control */ |
Johannes Berg | 59ae1d1 | 2017-06-16 14:29:20 +0200 | [diff] [blame] | 205 | skb_put_data(skb, sl->rbuff, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | skb->protocol = x25_type_trans(skb, sl->dev); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 207 | err = lapb_data_received(skb->dev, skb); |
| 208 | if (err != LAPB_OK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | kfree_skb(skb); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 210 | printk(KERN_DEBUG "x25_asy: data received err - %d\n", err); |
| 211 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | netif_rx(skb); |
Stephen Hemminger | 6a8eba3 | 2009-03-20 19:36:12 +0000 | [diff] [blame] | 213 | dev->stats.rx_packets++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
| 215 | } |
| 216 | |
| 217 | /* Encapsulate one IP datagram and stuff into a TTY queue. */ |
| 218 | static void x25_asy_encaps(struct x25_asy *sl, unsigned char *icp, int len) |
| 219 | { |
| 220 | unsigned char *p; |
| 221 | int actual, count, mtu = sl->dev->mtu; |
| 222 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 223 | if (len > mtu) { |
| 224 | /* Sigh, shouldn't occur BUT ... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | len = mtu; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 226 | printk(KERN_DEBUG "%s: truncating oversized transmit packet!\n", |
| 227 | sl->dev->name); |
Stephen Hemminger | 6a8eba3 | 2009-03-20 19:36:12 +0000 | [diff] [blame] | 228 | sl->dev->stats.tx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | x25_asy_unlock(sl); |
| 230 | return; |
| 231 | } |
| 232 | |
| 233 | p = icp; |
Joe Perches | c2fd03a | 2012-06-04 12:44:18 +0000 | [diff] [blame] | 234 | count = x25_asy_esc(p, sl->xbuff, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
| 236 | /* Order of next two lines is *very* important. |
| 237 | * When we are sending a little amount of data, |
| 238 | * the transfer may be completed inside driver.write() |
| 239 | * routine, because it's running with interrupts enabled. |
| 240 | * In this case we *never* got WRITE_WAKEUP event, |
| 241 | * if we did not request it before write operation. |
| 242 | * 14 Oct 1994 Dmitry Gorodchanin. |
| 243 | */ |
Alan Cox | 8a1ec21 | 2008-12-05 22:31:52 -0800 | [diff] [blame] | 244 | set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 245 | actual = sl->tty->ops->write(sl->tty, sl->xbuff, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | sl->xleft = count - actual; |
| 247 | sl->xhead = sl->xbuff + actual; |
| 248 | /* VSV */ |
| 249 | clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */ |
| 250 | } |
| 251 | |
| 252 | /* |
| 253 | * Called by the driver when there's room for more data. If we have |
| 254 | * more packets to send, we send them here. |
| 255 | */ |
| 256 | static void x25_asy_write_wakeup(struct tty_struct *tty) |
| 257 | { |
| 258 | int actual; |
Alan Cox | d2b8881 | 2008-12-05 22:32:22 -0800 | [diff] [blame] | 259 | struct x25_asy *sl = tty->disc_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
| 261 | /* First make sure we're connected. */ |
| 262 | if (!sl || sl->magic != X25_ASY_MAGIC || !netif_running(sl->dev)) |
| 263 | return; |
| 264 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 265 | if (sl->xleft <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | /* Now serial buffer is almost free & we can start |
| 267 | * transmission of another packet */ |
Stephen Hemminger | 6a8eba3 | 2009-03-20 19:36:12 +0000 | [diff] [blame] | 268 | sl->dev->stats.tx_packets++; |
Alan Cox | 8a1ec21 | 2008-12-05 22:31:52 -0800 | [diff] [blame] | 269 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | x25_asy_unlock(sl); |
| 271 | return; |
| 272 | } |
| 273 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 274 | actual = tty->ops->write(tty, sl->xhead, sl->xleft); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | sl->xleft -= actual; |
| 276 | sl->xhead += actual; |
| 277 | } |
| 278 | |
| 279 | static void x25_asy_timeout(struct net_device *dev) |
| 280 | { |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 281 | struct x25_asy *sl = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
| 283 | spin_lock(&sl->lock); |
| 284 | if (netif_queue_stopped(dev)) { |
| 285 | /* May be we must check transmitter timeout here ? |
| 286 | * 14 Oct 1994 Dmitry Gorodchanin. |
| 287 | */ |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 288 | netdev_warn(dev, "transmit timed out, %s?\n", |
| 289 | (tty_chars_in_buffer(sl->tty) || sl->xleft) ? |
| 290 | "bad line quality" : "driver error"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | sl->xleft = 0; |
Alan Cox | 8a1ec21 | 2008-12-05 22:31:52 -0800 | [diff] [blame] | 292 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | x25_asy_unlock(sl); |
| 294 | } |
| 295 | spin_unlock(&sl->lock); |
| 296 | } |
| 297 | |
| 298 | /* Encapsulate an IP datagram and kick it into a TTY queue. */ |
| 299 | |
Stephen Hemminger | d71a674 | 2009-08-31 19:50:47 +0000 | [diff] [blame] | 300 | static netdev_tx_t x25_asy_xmit(struct sk_buff *skb, |
| 301 | struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | { |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 303 | struct x25_asy *sl = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | int err; |
| 305 | |
| 306 | if (!netif_running(sl->dev)) { |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 307 | netdev_err(dev, "xmit call when iface is down\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 309 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 311 | |
| 312 | switch (skb->data[0]) { |
andrew hendry | 7eeeacf0 | 2010-04-19 13:29:47 +0000 | [diff] [blame] | 313 | case X25_IFACE_DATA: |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 314 | break; |
andrew hendry | 7eeeacf0 | 2010-04-19 13:29:47 +0000 | [diff] [blame] | 315 | case X25_IFACE_CONNECT: /* Connection request .. do nothing */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 316 | err = lapb_connect_request(dev); |
| 317 | if (err != LAPB_OK) |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 318 | netdev_err(dev, "lapb_connect_request error: %d\n", |
| 319 | err); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 320 | kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 321 | return NETDEV_TX_OK; |
andrew hendry | 7eeeacf0 | 2010-04-19 13:29:47 +0000 | [diff] [blame] | 322 | case X25_IFACE_DISCONNECT: /* do nothing - hang up ?? */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 323 | err = lapb_disconnect_request(dev); |
| 324 | if (err != LAPB_OK) |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 325 | netdev_err(dev, "lapb_disconnect_request error: %d\n", |
| 326 | err); |
Gustavo A. R. Silva | a3e2ecb | 2017-11-08 22:25:08 -0600 | [diff] [blame] | 327 | /* fall through */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 328 | default: |
| 329 | kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 330 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | } |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 332 | skb_pull(skb, 1); /* Remove control byte */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | /* |
| 334 | * If we are busy already- too bad. We ought to be able |
| 335 | * to queue things at this point, to allow for a little |
| 336 | * frame buffer. Oh well... |
| 337 | * ----------------------------------------------------- |
| 338 | * I hate queues in X.25 driver. May be it's efficient, |
| 339 | * but for me latency is more important. ;) |
| 340 | * So, no queues ! |
| 341 | * 14 Oct 1994 Dmitry Gorodchanin. |
| 342 | */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 343 | |
| 344 | err = lapb_data_request(dev, skb); |
| 345 | if (err != LAPB_OK) { |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 346 | netdev_err(dev, "lapb_data_request error: %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | kfree_skb(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 348 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | } |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 350 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | |
| 354 | /* |
| 355 | * LAPB interface boilerplate |
| 356 | */ |
| 357 | |
| 358 | /* |
| 359 | * Called when I frame data arrives. We did the work above - throw it |
| 360 | * at the net layer. |
| 361 | */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | static int x25_asy_data_indication(struct net_device *dev, struct sk_buff *skb) |
| 364 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | return netif_rx(skb); |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * Data has emerged from the LAPB protocol machine. We don't handle |
| 370 | * busy cases too well. Its tricky to see how to do this nicely - |
| 371 | * perhaps lapb should allow us to bounce this ? |
| 372 | */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | static void x25_asy_data_transmit(struct net_device *dev, struct sk_buff *skb) |
| 375 | { |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 376 | struct x25_asy *sl = netdev_priv(dev); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 377 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | spin_lock(&sl->lock); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 379 | if (netif_queue_stopped(sl->dev) || sl->tty == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | spin_unlock(&sl->lock); |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 381 | netdev_err(dev, "tbusy drop\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | kfree_skb(skb); |
| 383 | return; |
| 384 | } |
| 385 | /* We were not busy, so we are now... :-) */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 386 | if (skb != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | x25_asy_lock(sl); |
Stephen Hemminger | 6a8eba3 | 2009-03-20 19:36:12 +0000 | [diff] [blame] | 388 | dev->stats.tx_bytes += skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | x25_asy_encaps(sl, skb->data, skb->len); |
| 390 | dev_kfree_skb(skb); |
| 391 | } |
| 392 | spin_unlock(&sl->lock); |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * LAPB connection establish/down information. |
| 397 | */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 398 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | static void x25_asy_connected(struct net_device *dev, int reason) |
| 400 | { |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 401 | struct x25_asy *sl = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | struct sk_buff *skb; |
| 403 | unsigned char *ptr; |
| 404 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 405 | skb = dev_alloc_skb(1); |
| 406 | if (skb == NULL) { |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 407 | netdev_err(dev, "out of memory\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | return; |
| 409 | } |
| 410 | |
| 411 | ptr = skb_put(skb, 1); |
andrew hendry | 7eeeacf0 | 2010-04-19 13:29:47 +0000 | [diff] [blame] | 412 | *ptr = X25_IFACE_CONNECT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
| 414 | skb->protocol = x25_type_trans(skb, sl->dev); |
| 415 | netif_rx(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | } |
| 417 | |
| 418 | static void x25_asy_disconnected(struct net_device *dev, int reason) |
| 419 | { |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 420 | struct x25_asy *sl = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | struct sk_buff *skb; |
| 422 | unsigned char *ptr; |
| 423 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 424 | skb = dev_alloc_skb(1); |
| 425 | if (skb == NULL) { |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 426 | netdev_err(dev, "out of memory\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | return; |
| 428 | } |
| 429 | |
| 430 | ptr = skb_put(skb, 1); |
andrew hendry | 7eeeacf0 | 2010-04-19 13:29:47 +0000 | [diff] [blame] | 431 | *ptr = X25_IFACE_DISCONNECT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
| 433 | skb->protocol = x25_type_trans(skb, sl->dev); |
| 434 | netif_rx(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | } |
| 436 | |
stephen hemminger | d97a077 | 2011-09-16 11:04:29 +0000 | [diff] [blame] | 437 | static const struct lapb_register_struct x25_asy_callbacks = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | .connect_confirmation = x25_asy_connected, |
| 439 | .connect_indication = x25_asy_connected, |
| 440 | .disconnect_confirmation = x25_asy_disconnected, |
| 441 | .disconnect_indication = x25_asy_disconnected, |
| 442 | .data_indication = x25_asy_data_indication, |
| 443 | .data_transmit = x25_asy_data_transmit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | }; |
| 445 | |
| 446 | |
| 447 | /* Open the low-level part of the X.25 channel. Easy! */ |
| 448 | static int x25_asy_open(struct net_device *dev) |
| 449 | { |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 450 | struct x25_asy *sl = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | unsigned long len; |
| 452 | int err; |
| 453 | |
| 454 | if (sl->tty == NULL) |
| 455 | return -ENODEV; |
| 456 | |
| 457 | /* |
| 458 | * Allocate the X.25 frame buffers: |
| 459 | * |
| 460 | * rbuff Receive buffer. |
| 461 | * xbuff Transmit buffer. |
| 462 | */ |
| 463 | |
| 464 | len = dev->mtu * 2; |
| 465 | |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 466 | sl->rbuff = kmalloc(len + 4, GFP_KERNEL); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 467 | if (sl->rbuff == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | goto norbuff; |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 469 | sl->xbuff = kmalloc(len + 4, GFP_KERNEL); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 470 | if (sl->xbuff == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | goto noxbuff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
| 473 | sl->buffsize = len; |
| 474 | sl->rcount = 0; |
| 475 | sl->xleft = 0; |
| 476 | sl->flags &= (1 << SLF_INUSE); /* Clear ESCAPE & ERROR flags */ |
| 477 | |
| 478 | netif_start_queue(dev); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | /* |
| 481 | * Now attach LAPB |
| 482 | */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 483 | err = lapb_register(dev, &x25_asy_callbacks); |
| 484 | if (err == LAPB_OK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | return 0; |
| 486 | |
| 487 | /* Cleanup */ |
| 488 | kfree(sl->xbuff); |
Cong Wang | d5c7c74 | 2018-12-29 13:56:37 -0800 | [diff] [blame] | 489 | sl->xbuff = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | noxbuff: |
| 491 | kfree(sl->rbuff); |
Cong Wang | d5c7c74 | 2018-12-29 13:56:37 -0800 | [diff] [blame] | 492 | sl->rbuff = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | norbuff: |
| 494 | return -ENOMEM; |
| 495 | } |
| 496 | |
| 497 | |
| 498 | /* Close the low-level part of the X.25 channel. Easy! */ |
| 499 | static int x25_asy_close(struct net_device *dev) |
| 500 | { |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 501 | struct x25_asy *sl = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
| 503 | spin_lock(&sl->lock); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 504 | if (sl->tty) |
Alan Cox | 8a1ec21 | 2008-12-05 22:31:52 -0800 | [diff] [blame] | 505 | clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
| 507 | netif_stop_queue(dev); |
| 508 | sl->rcount = 0; |
| 509 | sl->xleft = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | spin_unlock(&sl->lock); |
| 511 | return 0; |
| 512 | } |
| 513 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | /* |
| 515 | * Handle the 'receiver data ready' interrupt. |
| 516 | * This function is called by the 'tty_io' module in the kernel when |
| 517 | * a block of X.25 data has been received, which can now be decapsulated |
| 518 | * and sent on to some IP layer for further processing. |
| 519 | */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 520 | |
| 521 | static void x25_asy_receive_buf(struct tty_struct *tty, |
| 522 | const unsigned char *cp, char *fp, int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | { |
Alan Cox | d2b8881 | 2008-12-05 22:32:22 -0800 | [diff] [blame] | 524 | struct x25_asy *sl = tty->disc_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
| 526 | if (!sl || sl->magic != X25_ASY_MAGIC || !netif_running(sl->dev)) |
| 527 | return; |
| 528 | |
| 529 | |
| 530 | /* Read the characters out of the buffer */ |
| 531 | while (count--) { |
| 532 | if (fp && *fp++) { |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 533 | if (!test_and_set_bit(SLF_ERROR, &sl->flags)) |
Stephen Hemminger | 6a8eba3 | 2009-03-20 19:36:12 +0000 | [diff] [blame] | 534 | sl->dev->stats.rx_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | cp++; |
| 536 | continue; |
| 537 | } |
| 538 | x25_asy_unesc(sl, *cp++); |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | /* |
| 543 | * Open the high-level part of the X.25 channel. |
| 544 | * This function is called by the TTY module when the |
| 545 | * X.25 line discipline is called for. Because we are |
| 546 | * sure the tty line exists, we only have to link it to |
| 547 | * a free X.25 channel... |
| 548 | */ |
| 549 | |
| 550 | static int x25_asy_open_tty(struct tty_struct *tty) |
| 551 | { |
Peter Hurley | ee9159d | 2015-11-27 14:18:39 -0500 | [diff] [blame] | 552 | struct x25_asy *sl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | int err; |
| 554 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 555 | if (tty->ops->write == NULL) |
| 556 | return -EOPNOTSUPP; |
| 557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | /* OK. Find a free X.25 channel to use. */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 559 | sl = x25_asy_alloc(); |
| 560 | if (sl == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | return -ENFILE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
| 563 | sl->tty = tty; |
| 564 | tty->disc_data = sl; |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 565 | tty->receive_room = 65536; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 566 | tty_driver_flush_buffer(tty); |
Alan Cox | 11b0cc3 | 2008-02-08 15:00:48 -0800 | [diff] [blame] | 567 | tty_ldisc_flush(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
| 569 | /* Restore default settings */ |
| 570 | sl->dev->type = ARPHRD_X25; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 572 | /* Perform the low-level X.25 async init */ |
| 573 | err = x25_asy_open(sl->dev); |
David S. Miller | 3b780be | 2016-01-13 11:45:39 -0500 | [diff] [blame] | 574 | if (err) { |
| 575 | x25_asy_free(sl); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 576 | return err; |
David S. Miller | 3b780be | 2016-01-13 11:45:39 -0500 | [diff] [blame] | 577 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | /* Done. We have linked the TTY line to a channel. */ |
Jiri Slaby | 6a20bd4 | 2010-11-25 00:27:55 +0100 | [diff] [blame] | 579 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | |
| 583 | /* |
| 584 | * Close down an X.25 channel. |
| 585 | * This means flushing out any pending queues, and then restoring the |
| 586 | * TTY line discipline to what it was before it got hooked to X.25 |
| 587 | * (which usually is TTY again). |
| 588 | */ |
| 589 | static void x25_asy_close_tty(struct tty_struct *tty) |
| 590 | { |
Alan Cox | d2b8881 | 2008-12-05 22:32:22 -0800 | [diff] [blame] | 591 | struct x25_asy *sl = tty->disc_data; |
Jiri Slaby | 03fe5f3 | 2010-11-24 13:54:54 +0000 | [diff] [blame] | 592 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | /* First make sure we're connected. */ |
| 595 | if (!sl || sl->magic != X25_ASY_MAGIC) |
| 596 | return; |
| 597 | |
Ben Hutchings | 3e3cda9 | 2008-05-06 19:41:48 +0100 | [diff] [blame] | 598 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | if (sl->dev->flags & IFF_UP) |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 600 | dev_close(sl->dev); |
Ben Hutchings | 3e3cda9 | 2008-05-06 19:41:48 +0100 | [diff] [blame] | 601 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
Jiri Slaby | 03fe5f3 | 2010-11-24 13:54:54 +0000 | [diff] [blame] | 603 | err = lapb_unregister(sl->dev); |
| 604 | if (err != LAPB_OK) |
Jeremy Sowden | 8e6a481 | 2019-06-16 11:43:32 +0100 | [diff] [blame] | 605 | pr_err("%s: lapb_unregister error: %d\n", |
| 606 | __func__, err); |
Jiri Slaby | 03fe5f3 | 2010-11-24 13:54:54 +0000 | [diff] [blame] | 607 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | tty->disc_data = NULL; |
| 609 | sl->tty = NULL; |
| 610 | x25_asy_free(sl); |
| 611 | } |
| 612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | /************************************************************************ |
| 614 | * STANDARD X.25 ENCAPSULATION * |
| 615 | ************************************************************************/ |
| 616 | |
Hannes Eder | 7b3dfa1 | 2008-12-26 00:11:21 -0800 | [diff] [blame] | 617 | static int x25_asy_esc(unsigned char *s, unsigned char *d, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | { |
| 619 | unsigned char *ptr = d; |
| 620 | unsigned char c; |
| 621 | |
| 622 | /* |
| 623 | * Send an initial END character to flush out any |
| 624 | * data that may have accumulated in the receiver |
| 625 | * due to line noise. |
| 626 | */ |
| 627 | |
| 628 | *ptr++ = X25_END; /* Send 10111110 bit seq */ |
| 629 | |
| 630 | /* |
| 631 | * For each byte in the packet, send the appropriate |
| 632 | * character sequence, according to the X.25 protocol. |
| 633 | */ |
| 634 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 635 | while (len-- > 0) { |
| 636 | switch (c = *s++) { |
| 637 | case X25_END: |
| 638 | *ptr++ = X25_ESC; |
| 639 | *ptr++ = X25_ESCAPE(X25_END); |
| 640 | break; |
| 641 | case X25_ESC: |
| 642 | *ptr++ = X25_ESC; |
| 643 | *ptr++ = X25_ESCAPE(X25_ESC); |
| 644 | break; |
| 645 | default: |
| 646 | *ptr++ = c; |
| 647 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | } |
| 649 | } |
| 650 | *ptr++ = X25_END; |
Eric Dumazet | 807540b | 2010-09-23 05:40:09 +0000 | [diff] [blame] | 651 | return ptr - d; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | } |
| 653 | |
| 654 | static void x25_asy_unesc(struct x25_asy *sl, unsigned char s) |
| 655 | { |
| 656 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 657 | switch (s) { |
| 658 | case X25_END: |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 659 | if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
| 660 | sl->rcount > 2) |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 661 | x25_asy_bump(sl); |
| 662 | clear_bit(SLF_ESCAPE, &sl->flags); |
| 663 | sl->rcount = 0; |
| 664 | return; |
| 665 | case X25_ESC: |
| 666 | set_bit(SLF_ESCAPE, &sl->flags); |
| 667 | return; |
| 668 | case X25_ESCAPE(X25_ESC): |
| 669 | case X25_ESCAPE(X25_END): |
| 670 | if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) |
| 671 | s = X25_UNESCAPE(s); |
| 672 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 674 | if (!test_bit(SLF_ERROR, &sl->flags)) { |
| 675 | if (sl->rcount < sl->buffsize) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | sl->rbuff[sl->rcount++] = s; |
| 677 | return; |
| 678 | } |
Stephen Hemminger | 6a8eba3 | 2009-03-20 19:36:12 +0000 | [diff] [blame] | 679 | sl->dev->stats.rx_over_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | set_bit(SLF_ERROR, &sl->flags); |
| 681 | } |
| 682 | } |
| 683 | |
| 684 | |
| 685 | /* Perform I/O control on an active X.25 channel. */ |
| 686 | static int x25_asy_ioctl(struct tty_struct *tty, struct file *file, |
| 687 | unsigned int cmd, unsigned long arg) |
| 688 | { |
Alan Cox | d2b8881 | 2008-12-05 22:32:22 -0800 | [diff] [blame] | 689 | struct x25_asy *sl = tty->disc_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
| 691 | /* First make sure we're connected. */ |
| 692 | if (!sl || sl->magic != X25_ASY_MAGIC) |
| 693 | return -EINVAL; |
| 694 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 695 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | case SIOCGIFNAME: |
| 697 | if (copy_to_user((void __user *)arg, sl->dev->name, |
| 698 | strlen(sl->dev->name) + 1)) |
| 699 | return -EFAULT; |
| 700 | return 0; |
| 701 | case SIOCSIFHWADDR: |
| 702 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | default: |
Alan Cox | d012753 | 2007-11-07 01:27:34 -0800 | [diff] [blame] | 704 | return tty_mode_ioctl(tty, file, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | } |
| 706 | } |
| 707 | |
| 708 | static int x25_asy_open_dev(struct net_device *dev) |
| 709 | { |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 710 | struct x25_asy *sl = netdev_priv(dev); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 711 | if (sl->tty == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | return -ENODEV; |
| 713 | return 0; |
| 714 | } |
| 715 | |
Stephen Hemminger | 48f26ad | 2009-03-20 19:36:13 +0000 | [diff] [blame] | 716 | static const struct net_device_ops x25_asy_netdev_ops = { |
| 717 | .ndo_open = x25_asy_open_dev, |
| 718 | .ndo_stop = x25_asy_close, |
| 719 | .ndo_start_xmit = x25_asy_xmit, |
| 720 | .ndo_tx_timeout = x25_asy_timeout, |
| 721 | .ndo_change_mtu = x25_asy_change_mtu, |
| 722 | }; |
| 723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | /* Initialise the X.25 driver. Called by the device init code */ |
| 725 | static void x25_asy_setup(struct net_device *dev) |
| 726 | { |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 727 | struct x25_asy *sl = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
| 729 | sl->magic = X25_ASY_MAGIC; |
| 730 | sl->dev = dev; |
| 731 | spin_lock_init(&sl->lock); |
| 732 | set_bit(SLF_INUSE, &sl->flags); |
| 733 | |
| 734 | /* |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 735 | * Finish setting up the DEVICE info. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | */ |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 737 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | dev->mtu = SL_MTU; |
Jarod Wilson | 8b6b413 | 2016-10-20 13:55:19 -0400 | [diff] [blame] | 739 | dev->min_mtu = 0; |
| 740 | dev->max_mtu = 65534; |
Stephen Hemminger | 48f26ad | 2009-03-20 19:36:13 +0000 | [diff] [blame] | 741 | dev->netdev_ops = &x25_asy_netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | dev->watchdog_timeo = HZ*20; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | dev->hard_header_len = 0; |
| 744 | dev->addr_len = 0; |
| 745 | dev->type = ARPHRD_X25; |
| 746 | dev->tx_queue_len = 10; |
| 747 | |
| 748 | /* New-style flags. */ |
| 749 | dev->flags = IFF_NOARP; |
| 750 | } |
| 751 | |
Alan Cox | a352def | 2008-07-16 21:53:12 +0100 | [diff] [blame] | 752 | static struct tty_ldisc_ops x25_ldisc = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | .owner = THIS_MODULE, |
| 754 | .magic = TTY_LDISC_MAGIC, |
| 755 | .name = "X.25", |
| 756 | .open = x25_asy_open_tty, |
| 757 | .close = x25_asy_close_tty, |
| 758 | .ioctl = x25_asy_ioctl, |
| 759 | .receive_buf = x25_asy_receive_buf, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | .write_wakeup = x25_asy_write_wakeup, |
| 761 | }; |
| 762 | |
| 763 | static int __init init_x25_asy(void) |
| 764 | { |
| 765 | if (x25_asy_maxdev < 4) |
| 766 | x25_asy_maxdev = 4; /* Sanity */ |
| 767 | |
Joe Perches | 23efcb7 | 2011-06-26 19:01:35 +0000 | [diff] [blame] | 768 | pr_info("X.25 async: version 0.00 ALPHA (dynamic channels, max=%d)\n", |
| 769 | x25_asy_maxdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 771 | x25_asy_devs = kcalloc(x25_asy_maxdev, sizeof(struct net_device *), |
| 772 | GFP_KERNEL); |
Joe Perches | e404dec | 2012-01-29 12:56:23 +0000 | [diff] [blame] | 773 | if (!x25_asy_devs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
| 776 | return tty_register_ldisc(N_X25, &x25_ldisc); |
| 777 | } |
| 778 | |
| 779 | |
| 780 | static void __exit exit_x25_asy(void) |
| 781 | { |
| 782 | struct net_device *dev; |
| 783 | int i; |
| 784 | |
| 785 | for (i = 0; i < x25_asy_maxdev; i++) { |
| 786 | dev = x25_asy_devs[i]; |
| 787 | if (dev) { |
Wang Chen | 8f15ea4 | 2008-11-12 23:38:36 -0800 | [diff] [blame] | 788 | struct x25_asy *sl = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
| 790 | spin_lock_bh(&sl->lock); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 791 | if (sl->tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | tty_hangup(sl->tty); |
| 793 | |
| 794 | spin_unlock_bh(&sl->lock); |
| 795 | /* |
| 796 | * VSV = if dev->start==0, then device |
| 797 | * unregistered while close proc. |
| 798 | */ |
| 799 | unregister_netdev(dev); |
| 800 | free_netdev(dev); |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | kfree(x25_asy_devs); |
Alexey Dobriyan | 64ccd71 | 2005-06-23 00:10:33 -0700 | [diff] [blame] | 805 | tty_unregister_ldisc(N_X25); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | module_init(init_x25_asy); |
| 809 | module_exit(exit_x25_asy); |