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836 lines
18 KiB
836 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Things to sort out: |
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* |
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* o tbusy handling |
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* o allow users to set the parameters |
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* o sync/async switching ? |
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* |
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* Note: This does _not_ implement CCITT X.25 asynchronous framing |
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* recommendations. Its primarily for testing purposes. If you wanted |
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* to do CCITT then in theory all you need is to nick the HDLC async |
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* checksum routines from ppp.c |
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* Changes: |
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* |
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* 2000-10-29 Henner Eisen lapb_data_indication() return status. |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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|
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#include <linux/uaccess.h> |
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#include <linux/bitops.h> |
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#include <linux/string.h> |
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#include <linux/mm.h> |
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#include <linux/interrupt.h> |
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#include <linux/in.h> |
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#include <linux/tty.h> |
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#include <linux/errno.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/skbuff.h> |
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#include <linux/if_arp.h> |
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#include <linux/lapb.h> |
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#include <linux/init.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/slab.h> |
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#include <net/x25device.h> |
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#include "x25_asy.h" |
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|
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static struct net_device **x25_asy_devs; |
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static int x25_asy_maxdev = SL_NRUNIT; |
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|
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module_param(x25_asy_maxdev, int, 0); |
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MODULE_LICENSE("GPL"); |
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static int x25_asy_esc(unsigned char *p, unsigned char *d, int len); |
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static void x25_asy_unesc(struct x25_asy *sl, unsigned char c); |
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static void x25_asy_setup(struct net_device *dev); |
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|
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/* Find a free X.25 channel, and link in this `tty' line. */ |
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static struct x25_asy *x25_asy_alloc(void) |
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{ |
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struct net_device *dev = NULL; |
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struct x25_asy *sl; |
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int i; |
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|
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if (x25_asy_devs == NULL) |
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return NULL; /* Master array missing ! */ |
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|
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for (i = 0; i < x25_asy_maxdev; i++) { |
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dev = x25_asy_devs[i]; |
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|
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/* Not allocated ? */ |
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if (dev == NULL) |
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break; |
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|
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sl = netdev_priv(dev); |
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/* Not in use ? */ |
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if (!test_and_set_bit(SLF_INUSE, &sl->flags)) |
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return sl; |
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} |
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|
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/* Sorry, too many, all slots in use */ |
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if (i >= x25_asy_maxdev) |
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return NULL; |
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|
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/* If no channels are available, allocate one */ |
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if (!dev) { |
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char name[IFNAMSIZ]; |
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sprintf(name, "x25asy%d", i); |
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|
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dev = alloc_netdev(sizeof(struct x25_asy), name, |
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NET_NAME_UNKNOWN, x25_asy_setup); |
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if (!dev) |
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return NULL; |
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|
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/* Initialize channel control data */ |
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sl = netdev_priv(dev); |
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dev->base_addr = i; |
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|
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/* register device so that it can be ifconfig'ed */ |
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if (register_netdev(dev) == 0) { |
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/* (Re-)Set the INUSE bit. Very Important! */ |
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set_bit(SLF_INUSE, &sl->flags); |
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x25_asy_devs[i] = dev; |
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return sl; |
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} else { |
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pr_warn("%s(): register_netdev() failure\n", __func__); |
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free_netdev(dev); |
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} |
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} |
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return NULL; |
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} |
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|
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/* Free an X.25 channel. */ |
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static void x25_asy_free(struct x25_asy *sl) |
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{ |
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/* Free all X.25 frame buffers. */ |
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kfree(sl->rbuff); |
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sl->rbuff = NULL; |
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kfree(sl->xbuff); |
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sl->xbuff = NULL; |
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|
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if (!test_and_clear_bit(SLF_INUSE, &sl->flags)) |
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netdev_err(sl->dev, "x25_asy_free for already free unit\n"); |
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} |
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static int x25_asy_change_mtu(struct net_device *dev, int newmtu) |
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{ |
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struct x25_asy *sl = netdev_priv(dev); |
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unsigned char *xbuff, *rbuff; |
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int len; |
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|
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len = 2 * newmtu; |
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xbuff = kmalloc(len + 4, GFP_ATOMIC); |
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rbuff = kmalloc(len + 4, GFP_ATOMIC); |
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|
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if (xbuff == NULL || rbuff == NULL) { |
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kfree(xbuff); |
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kfree(rbuff); |
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return -ENOMEM; |
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} |
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spin_lock_bh(&sl->lock); |
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xbuff = xchg(&sl->xbuff, xbuff); |
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if (sl->xleft) { |
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if (sl->xleft <= len) { |
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memcpy(sl->xbuff, sl->xhead, sl->xleft); |
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} else { |
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sl->xleft = 0; |
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dev->stats.tx_dropped++; |
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} |
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} |
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sl->xhead = sl->xbuff; |
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|
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rbuff = xchg(&sl->rbuff, rbuff); |
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if (sl->rcount) { |
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if (sl->rcount <= len) { |
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memcpy(sl->rbuff, rbuff, sl->rcount); |
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} else { |
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sl->rcount = 0; |
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dev->stats.rx_over_errors++; |
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set_bit(SLF_ERROR, &sl->flags); |
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} |
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} |
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dev->mtu = newmtu; |
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sl->buffsize = len; |
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spin_unlock_bh(&sl->lock); |
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kfree(xbuff); |
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kfree(rbuff); |
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return 0; |
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} |
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/* Set the "sending" flag. This must be atomic, hence the ASM. */ |
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static inline void x25_asy_lock(struct x25_asy *sl) |
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{ |
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netif_stop_queue(sl->dev); |
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} |
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/* Clear the "sending" flag. This must be atomic, hence the ASM. */ |
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static inline void x25_asy_unlock(struct x25_asy *sl) |
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{ |
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netif_wake_queue(sl->dev); |
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} |
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|
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/* Send an LAPB frame to the LAPB module to process. */ |
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|
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static void x25_asy_bump(struct x25_asy *sl) |
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{ |
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struct net_device *dev = sl->dev; |
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struct sk_buff *skb; |
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int count; |
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int err; |
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|
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count = sl->rcount; |
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dev->stats.rx_bytes += count; |
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|
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skb = dev_alloc_skb(count); |
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if (skb == NULL) { |
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netdev_warn(sl->dev, "memory squeeze, dropping packet\n"); |
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dev->stats.rx_dropped++; |
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return; |
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} |
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skb_put_data(skb, sl->rbuff, count); |
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err = lapb_data_received(sl->dev, skb); |
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if (err != LAPB_OK) { |
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kfree_skb(skb); |
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printk(KERN_DEBUG "x25_asy: data received err - %d\n", err); |
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} else { |
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dev->stats.rx_packets++; |
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} |
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} |
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|
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/* Encapsulate one IP datagram and stuff into a TTY queue. */ |
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static void x25_asy_encaps(struct x25_asy *sl, unsigned char *icp, int len) |
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{ |
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unsigned char *p; |
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int actual, count, mtu = sl->dev->mtu; |
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|
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if (len > mtu) { |
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/* Sigh, shouldn't occur BUT ... */ |
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len = mtu; |
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printk(KERN_DEBUG "%s: truncating oversized transmit packet!\n", |
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sl->dev->name); |
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sl->dev->stats.tx_dropped++; |
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x25_asy_unlock(sl); |
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return; |
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} |
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p = icp; |
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count = x25_asy_esc(p, sl->xbuff, len); |
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|
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/* Order of next two lines is *very* important. |
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* When we are sending a little amount of data, |
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* the transfer may be completed inside driver.write() |
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* routine, because it's running with interrupts enabled. |
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* In this case we *never* got WRITE_WAKEUP event, |
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* if we did not request it before write operation. |
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* 14 Oct 1994 Dmitry Gorodchanin. |
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*/ |
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set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
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actual = sl->tty->ops->write(sl->tty, sl->xbuff, count); |
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sl->xleft = count - actual; |
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sl->xhead = sl->xbuff + actual; |
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} |
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|
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/* |
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* Called by the driver when there's room for more data. If we have |
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* more packets to send, we send them here. |
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*/ |
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static void x25_asy_write_wakeup(struct tty_struct *tty) |
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{ |
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int actual; |
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struct x25_asy *sl = tty->disc_data; |
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|
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/* First make sure we're connected. */ |
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if (!sl || sl->magic != X25_ASY_MAGIC || !netif_running(sl->dev)) |
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return; |
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|
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if (sl->xleft <= 0) { |
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/* Now serial buffer is almost free & we can start |
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* transmission of another packet */ |
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sl->dev->stats.tx_packets++; |
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clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); |
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x25_asy_unlock(sl); |
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return; |
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} |
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actual = tty->ops->write(tty, sl->xhead, sl->xleft); |
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sl->xleft -= actual; |
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sl->xhead += actual; |
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} |
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static void x25_asy_timeout(struct net_device *dev, unsigned int txqueue) |
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{ |
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struct x25_asy *sl = netdev_priv(dev); |
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spin_lock(&sl->lock); |
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if (netif_queue_stopped(dev)) { |
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/* May be we must check transmitter timeout here ? |
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* 14 Oct 1994 Dmitry Gorodchanin. |
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*/ |
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netdev_warn(dev, "transmit timed out, %s?\n", |
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(tty_chars_in_buffer(sl->tty) || sl->xleft) ? |
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"bad line quality" : "driver error"); |
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sl->xleft = 0; |
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clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
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x25_asy_unlock(sl); |
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} |
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spin_unlock(&sl->lock); |
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} |
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|
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/* Encapsulate an IP datagram and kick it into a TTY queue. */ |
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|
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static netdev_tx_t x25_asy_xmit(struct sk_buff *skb, |
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struct net_device *dev) |
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{ |
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struct x25_asy *sl = netdev_priv(dev); |
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int err; |
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|
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if (!netif_running(sl->dev)) { |
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netdev_err(dev, "xmit call when iface is down\n"); |
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kfree_skb(skb); |
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return NETDEV_TX_OK; |
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} |
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|
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/* There should be a pseudo header of 1 byte added by upper layers. |
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* Check to make sure it is there before reading it. |
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*/ |
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if (skb->len < 1) { |
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kfree_skb(skb); |
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return NETDEV_TX_OK; |
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} |
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|
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switch (skb->data[0]) { |
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case X25_IFACE_DATA: |
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break; |
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case X25_IFACE_CONNECT: /* Connection request .. do nothing */ |
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err = lapb_connect_request(dev); |
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if (err != LAPB_OK) |
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netdev_err(dev, "lapb_connect_request error: %d\n", |
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err); |
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kfree_skb(skb); |
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return NETDEV_TX_OK; |
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case X25_IFACE_DISCONNECT: /* do nothing - hang up ?? */ |
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err = lapb_disconnect_request(dev); |
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if (err != LAPB_OK) |
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netdev_err(dev, "lapb_disconnect_request error: %d\n", |
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err); |
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fallthrough; |
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default: |
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kfree_skb(skb); |
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return NETDEV_TX_OK; |
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} |
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skb_pull(skb, 1); /* Remove control byte */ |
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/* |
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* If we are busy already- too bad. We ought to be able |
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* to queue things at this point, to allow for a little |
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* frame buffer. Oh well... |
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* ----------------------------------------------------- |
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* I hate queues in X.25 driver. May be it's efficient, |
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* but for me latency is more important. ;) |
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* So, no queues ! |
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* 14 Oct 1994 Dmitry Gorodchanin. |
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*/ |
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err = lapb_data_request(dev, skb); |
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if (err != LAPB_OK) { |
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netdev_err(dev, "lapb_data_request error: %d\n", err); |
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kfree_skb(skb); |
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return NETDEV_TX_OK; |
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} |
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return NETDEV_TX_OK; |
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} |
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/* |
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* LAPB interface boilerplate |
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*/ |
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|
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/* |
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* Called when I frame data arrive. We add a pseudo header for upper |
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* layers and pass it to upper layers. |
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*/ |
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|
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static int x25_asy_data_indication(struct net_device *dev, struct sk_buff *skb) |
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{ |
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if (skb_cow(skb, 1)) { |
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kfree_skb(skb); |
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return NET_RX_DROP; |
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} |
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skb_push(skb, 1); |
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skb->data[0] = X25_IFACE_DATA; |
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|
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skb->protocol = x25_type_trans(skb, dev); |
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|
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return netif_rx(skb); |
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} |
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|
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/* |
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* Data has emerged from the LAPB protocol machine. We don't handle |
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* busy cases too well. Its tricky to see how to do this nicely - |
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* perhaps lapb should allow us to bounce this ? |
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*/ |
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|
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static void x25_asy_data_transmit(struct net_device *dev, struct sk_buff *skb) |
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{ |
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struct x25_asy *sl = netdev_priv(dev); |
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|
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spin_lock(&sl->lock); |
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if (netif_queue_stopped(sl->dev) || sl->tty == NULL) { |
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spin_unlock(&sl->lock); |
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netdev_err(dev, "tbusy drop\n"); |
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kfree_skb(skb); |
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return; |
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} |
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/* We were not busy, so we are now... :-) */ |
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if (skb != NULL) { |
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x25_asy_lock(sl); |
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dev->stats.tx_bytes += skb->len; |
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x25_asy_encaps(sl, skb->data, skb->len); |
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dev_kfree_skb(skb); |
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} |
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spin_unlock(&sl->lock); |
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} |
|
|
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/* |
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* LAPB connection establish/down information. |
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*/ |
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|
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static void x25_asy_connected(struct net_device *dev, int reason) |
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{ |
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struct x25_asy *sl = netdev_priv(dev); |
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struct sk_buff *skb; |
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unsigned char *ptr; |
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|
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skb = dev_alloc_skb(1); |
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if (skb == NULL) { |
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netdev_err(dev, "out of memory\n"); |
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return; |
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} |
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|
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ptr = skb_put(skb, 1); |
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*ptr = X25_IFACE_CONNECT; |
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|
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skb->protocol = x25_type_trans(skb, sl->dev); |
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netif_rx(skb); |
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} |
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|
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static void x25_asy_disconnected(struct net_device *dev, int reason) |
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{ |
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struct x25_asy *sl = netdev_priv(dev); |
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struct sk_buff *skb; |
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unsigned char *ptr; |
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|
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skb = dev_alloc_skb(1); |
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if (skb == NULL) { |
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netdev_err(dev, "out of memory\n"); |
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return; |
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} |
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ptr = skb_put(skb, 1); |
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*ptr = X25_IFACE_DISCONNECT; |
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|
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skb->protocol = x25_type_trans(skb, sl->dev); |
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netif_rx(skb); |
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} |
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|
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static const struct lapb_register_struct x25_asy_callbacks = { |
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.connect_confirmation = x25_asy_connected, |
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.connect_indication = x25_asy_connected, |
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.disconnect_confirmation = x25_asy_disconnected, |
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.disconnect_indication = x25_asy_disconnected, |
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.data_indication = x25_asy_data_indication, |
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.data_transmit = x25_asy_data_transmit, |
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}; |
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|
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|
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/* Open the low-level part of the X.25 channel. Easy! */ |
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static int x25_asy_open(struct net_device *dev) |
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{ |
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struct x25_asy *sl = netdev_priv(dev); |
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unsigned long len; |
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|
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if (sl->tty == NULL) |
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return -ENODEV; |
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|
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/* |
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* Allocate the X.25 frame buffers: |
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* |
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* rbuff Receive buffer. |
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* xbuff Transmit buffer. |
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*/ |
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|
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len = dev->mtu * 2; |
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|
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sl->rbuff = kmalloc(len + 4, GFP_KERNEL); |
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if (sl->rbuff == NULL) |
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goto norbuff; |
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sl->xbuff = kmalloc(len + 4, GFP_KERNEL); |
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if (sl->xbuff == NULL) |
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goto noxbuff; |
|
|
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sl->buffsize = len; |
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sl->rcount = 0; |
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sl->xleft = 0; |
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sl->flags &= (1 << SLF_INUSE); /* Clear ESCAPE & ERROR flags */ |
|
|
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return 0; |
|
|
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/* Cleanup */ |
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kfree(sl->xbuff); |
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sl->xbuff = NULL; |
|
noxbuff: |
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kfree(sl->rbuff); |
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sl->rbuff = NULL; |
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norbuff: |
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return -ENOMEM; |
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} |
|
|
|
|
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/* Close the low-level part of the X.25 channel. Easy! */ |
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static int x25_asy_close(struct net_device *dev) |
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{ |
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struct x25_asy *sl = netdev_priv(dev); |
|
|
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spin_lock(&sl->lock); |
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if (sl->tty) |
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clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); |
|
|
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sl->rcount = 0; |
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sl->xleft = 0; |
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spin_unlock(&sl->lock); |
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return 0; |
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} |
|
|
|
/* |
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* Handle the 'receiver data ready' interrupt. |
|
* This function is called by the 'tty_io' module in the kernel when |
|
* a block of X.25 data has been received, which can now be decapsulated |
|
* and sent on to some IP layer for further processing. |
|
*/ |
|
|
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static void x25_asy_receive_buf(struct tty_struct *tty, |
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const unsigned char *cp, char *fp, int count) |
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{ |
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struct x25_asy *sl = tty->disc_data; |
|
|
|
if (!sl || sl->magic != X25_ASY_MAGIC || !netif_running(sl->dev)) |
|
return; |
|
|
|
|
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/* Read the characters out of the buffer */ |
|
while (count--) { |
|
if (fp && *fp++) { |
|
if (!test_and_set_bit(SLF_ERROR, &sl->flags)) |
|
sl->dev->stats.rx_errors++; |
|
cp++; |
|
continue; |
|
} |
|
x25_asy_unesc(sl, *cp++); |
|
} |
|
} |
|
|
|
/* |
|
* Open the high-level part of the X.25 channel. |
|
* This function is called by the TTY module when the |
|
* X.25 line discipline is called for. Because we are |
|
* sure the tty line exists, we only have to link it to |
|
* a free X.25 channel... |
|
*/ |
|
|
|
static int x25_asy_open_tty(struct tty_struct *tty) |
|
{ |
|
struct x25_asy *sl; |
|
int err; |
|
|
|
if (tty->ops->write == NULL) |
|
return -EOPNOTSUPP; |
|
|
|
/* OK. Find a free X.25 channel to use. */ |
|
sl = x25_asy_alloc(); |
|
if (sl == NULL) |
|
return -ENFILE; |
|
|
|
sl->tty = tty; |
|
tty->disc_data = sl; |
|
tty->receive_room = 65536; |
|
tty_driver_flush_buffer(tty); |
|
tty_ldisc_flush(tty); |
|
|
|
/* Restore default settings */ |
|
sl->dev->type = ARPHRD_X25; |
|
|
|
/* Perform the low-level X.25 async init */ |
|
err = x25_asy_open(sl->dev); |
|
if (err) { |
|
x25_asy_free(sl); |
|
return err; |
|
} |
|
/* Done. We have linked the TTY line to a channel. */ |
|
return 0; |
|
} |
|
|
|
|
|
/* |
|
* Close down an X.25 channel. |
|
* This means flushing out any pending queues, and then restoring the |
|
* TTY line discipline to what it was before it got hooked to X.25 |
|
* (which usually is TTY again). |
|
*/ |
|
static void x25_asy_close_tty(struct tty_struct *tty) |
|
{ |
|
struct x25_asy *sl = tty->disc_data; |
|
|
|
/* First make sure we're connected. */ |
|
if (!sl || sl->magic != X25_ASY_MAGIC) |
|
return; |
|
|
|
rtnl_lock(); |
|
if (sl->dev->flags & IFF_UP) |
|
dev_close(sl->dev); |
|
rtnl_unlock(); |
|
|
|
tty->disc_data = NULL; |
|
sl->tty = NULL; |
|
x25_asy_free(sl); |
|
} |
|
|
|
/************************************************************************ |
|
* STANDARD X.25 ENCAPSULATION * |
|
************************************************************************/ |
|
|
|
static int x25_asy_esc(unsigned char *s, unsigned char *d, int len) |
|
{ |
|
unsigned char *ptr = d; |
|
unsigned char c; |
|
|
|
/* |
|
* Send an initial END character to flush out any |
|
* data that may have accumulated in the receiver |
|
* due to line noise. |
|
*/ |
|
|
|
*ptr++ = X25_END; /* Send 10111110 bit seq */ |
|
|
|
/* |
|
* For each byte in the packet, send the appropriate |
|
* character sequence, according to the X.25 protocol. |
|
*/ |
|
|
|
while (len-- > 0) { |
|
switch (c = *s++) { |
|
case X25_END: |
|
*ptr++ = X25_ESC; |
|
*ptr++ = X25_ESCAPE(X25_END); |
|
break; |
|
case X25_ESC: |
|
*ptr++ = X25_ESC; |
|
*ptr++ = X25_ESCAPE(X25_ESC); |
|
break; |
|
default: |
|
*ptr++ = c; |
|
break; |
|
} |
|
} |
|
*ptr++ = X25_END; |
|
return ptr - d; |
|
} |
|
|
|
static void x25_asy_unesc(struct x25_asy *sl, unsigned char s) |
|
{ |
|
|
|
switch (s) { |
|
case X25_END: |
|
if (!test_and_clear_bit(SLF_ERROR, &sl->flags) && |
|
sl->rcount >= 2) |
|
x25_asy_bump(sl); |
|
clear_bit(SLF_ESCAPE, &sl->flags); |
|
sl->rcount = 0; |
|
return; |
|
case X25_ESC: |
|
set_bit(SLF_ESCAPE, &sl->flags); |
|
return; |
|
case X25_ESCAPE(X25_ESC): |
|
case X25_ESCAPE(X25_END): |
|
if (test_and_clear_bit(SLF_ESCAPE, &sl->flags)) |
|
s = X25_UNESCAPE(s); |
|
break; |
|
} |
|
if (!test_bit(SLF_ERROR, &sl->flags)) { |
|
if (sl->rcount < sl->buffsize) { |
|
sl->rbuff[sl->rcount++] = s; |
|
return; |
|
} |
|
sl->dev->stats.rx_over_errors++; |
|
set_bit(SLF_ERROR, &sl->flags); |
|
} |
|
} |
|
|
|
|
|
/* Perform I/O control on an active X.25 channel. */ |
|
static int x25_asy_ioctl(struct tty_struct *tty, struct file *file, |
|
unsigned int cmd, unsigned long arg) |
|
{ |
|
struct x25_asy *sl = tty->disc_data; |
|
|
|
/* First make sure we're connected. */ |
|
if (!sl || sl->magic != X25_ASY_MAGIC) |
|
return -EINVAL; |
|
|
|
switch (cmd) { |
|
case SIOCGIFNAME: |
|
if (copy_to_user((void __user *)arg, sl->dev->name, |
|
strlen(sl->dev->name) + 1)) |
|
return -EFAULT; |
|
return 0; |
|
case SIOCSIFHWADDR: |
|
return -EINVAL; |
|
default: |
|
return tty_mode_ioctl(tty, file, cmd, arg); |
|
} |
|
} |
|
|
|
static int x25_asy_open_dev(struct net_device *dev) |
|
{ |
|
int err; |
|
struct x25_asy *sl = netdev_priv(dev); |
|
if (sl->tty == NULL) |
|
return -ENODEV; |
|
|
|
err = lapb_register(dev, &x25_asy_callbacks); |
|
if (err != LAPB_OK) |
|
return -ENOMEM; |
|
|
|
netif_start_queue(dev); |
|
|
|
return 0; |
|
} |
|
|
|
static int x25_asy_close_dev(struct net_device *dev) |
|
{ |
|
int err; |
|
|
|
netif_stop_queue(dev); |
|
|
|
err = lapb_unregister(dev); |
|
if (err != LAPB_OK) |
|
pr_err("%s: lapb_unregister error: %d\n", |
|
__func__, err); |
|
|
|
x25_asy_close(dev); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct net_device_ops x25_asy_netdev_ops = { |
|
.ndo_open = x25_asy_open_dev, |
|
.ndo_stop = x25_asy_close_dev, |
|
.ndo_start_xmit = x25_asy_xmit, |
|
.ndo_tx_timeout = x25_asy_timeout, |
|
.ndo_change_mtu = x25_asy_change_mtu, |
|
}; |
|
|
|
/* Initialise the X.25 driver. Called by the device init code */ |
|
static void x25_asy_setup(struct net_device *dev) |
|
{ |
|
struct x25_asy *sl = netdev_priv(dev); |
|
|
|
sl->magic = X25_ASY_MAGIC; |
|
sl->dev = dev; |
|
spin_lock_init(&sl->lock); |
|
set_bit(SLF_INUSE, &sl->flags); |
|
|
|
/* |
|
* Finish setting up the DEVICE info. |
|
*/ |
|
|
|
dev->mtu = SL_MTU; |
|
dev->min_mtu = 0; |
|
dev->max_mtu = 65534; |
|
dev->netdev_ops = &x25_asy_netdev_ops; |
|
dev->watchdog_timeo = HZ*20; |
|
dev->hard_header_len = 0; |
|
dev->addr_len = 0; |
|
dev->type = ARPHRD_X25; |
|
dev->tx_queue_len = 10; |
|
|
|
/* When transmitting data: |
|
* first this driver removes a pseudo header of 1 byte, |
|
* then the lapb module prepends an LAPB header of at most 3 bytes. |
|
*/ |
|
dev->needed_headroom = 3 - 1; |
|
|
|
/* New-style flags. */ |
|
dev->flags = IFF_NOARP; |
|
} |
|
|
|
static struct tty_ldisc_ops x25_ldisc = { |
|
.owner = THIS_MODULE, |
|
.magic = TTY_LDISC_MAGIC, |
|
.name = "X.25", |
|
.open = x25_asy_open_tty, |
|
.close = x25_asy_close_tty, |
|
.ioctl = x25_asy_ioctl, |
|
.receive_buf = x25_asy_receive_buf, |
|
.write_wakeup = x25_asy_write_wakeup, |
|
}; |
|
|
|
static int __init init_x25_asy(void) |
|
{ |
|
if (x25_asy_maxdev < 4) |
|
x25_asy_maxdev = 4; /* Sanity */ |
|
|
|
pr_info("X.25 async: version 0.00 ALPHA (dynamic channels, max=%d)\n", |
|
x25_asy_maxdev); |
|
|
|
x25_asy_devs = kcalloc(x25_asy_maxdev, sizeof(struct net_device *), |
|
GFP_KERNEL); |
|
if (!x25_asy_devs) |
|
return -ENOMEM; |
|
|
|
return tty_register_ldisc(N_X25, &x25_ldisc); |
|
} |
|
|
|
|
|
static void __exit exit_x25_asy(void) |
|
{ |
|
struct net_device *dev; |
|
int i; |
|
|
|
for (i = 0; i < x25_asy_maxdev; i++) { |
|
dev = x25_asy_devs[i]; |
|
if (dev) { |
|
struct x25_asy *sl = netdev_priv(dev); |
|
|
|
spin_lock_bh(&sl->lock); |
|
if (sl->tty) |
|
tty_hangup(sl->tty); |
|
|
|
spin_unlock_bh(&sl->lock); |
|
/* |
|
* VSV = if dev->start==0, then device |
|
* unregistered while close proc. |
|
*/ |
|
unregister_netdev(dev); |
|
free_netdev(dev); |
|
} |
|
} |
|
|
|
kfree(x25_asy_devs); |
|
tty_unregister_ldisc(N_X25); |
|
} |
|
|
|
module_init(init_x25_asy); |
|
module_exit(exit_x25_asy);
|
|
|