Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Linus Torvalds (pre-git) | 2343 | 73.52% | 9 | 17.65% |
Stephen Hemminger | 402 | 12.61% | 6 | 11.76% |
Christoph Hellwig | 112 | 3.51% | 1 | 1.96% |
Alan Cox | 91 | 2.86% | 6 | 11.76% |
Joe Perches | 51 | 1.60% | 1 | 1.96% |
Wang Chen | 39 | 1.22% | 1 | 1.96% |
Al Viro | 28 | 0.88% | 6 | 11.76% |
Jiri Slaby | 24 | 0.75% | 2 | 3.92% |
Arnaldo Carvalho de Melo | 16 | 0.50% | 1 | 1.96% |
Américo Wang | 12 | 0.38% | 1 | 1.96% |
Jarod Wilson | 12 | 0.38% | 1 | 1.96% |
Ben Hutchings | 9 | 0.28% | 1 | 1.96% |
Andrew Hendry | 9 | 0.28% | 1 | 1.96% |
David S. Miller | 7 | 0.22% | 1 | 1.96% |
Patrick McHardy | 5 | 0.16% | 1 | 1.96% |
Linus Torvalds | 5 | 0.16% | 1 | 1.96% |
Dan Carpenter | 4 | 0.13% | 1 | 1.96% |
Andrew Morton | 4 | 0.13% | 1 | 1.96% |
Yoann Padioleau | 3 | 0.09% | 1 | 1.96% |
Tejun Heo | 3 | 0.09% | 1 | 1.96% |
Tom Gundersen | 2 | 0.06% | 1 | 1.96% |
Gustavo A. R. Silva | 1 | 0.03% | 1 | 1.96% |
Johannes Berg | 1 | 0.03% | 1 | 1.96% |
Alexey Dobriyan | 1 | 0.03% | 1 | 1.96% |
Thomas Gleixner | 1 | 0.03% | 1 | 1.96% |
Adrian Bunk | 1 | 0.03% | 1 | 1.96% |
Hannes Eder | 1 | 0.03% | 1 | 1.96% |
Total | 3187 | 51 |
// SPDX-License-Identifier: GPL-2.0-only /* * Things to sort out: * * o tbusy handling * o allow users to set the parameters * o sync/async switching ? * * Note: This does _not_ implement CCITT X.25 asynchronous framing * recommendations. Its primarily for testing purposes. If you wanted * to do CCITT then in theory all you need is to nick the HDLC async * checksum routines from ppp.c * Changes: * * 2000-10-29 Henner Eisen lapb_data_indication() return status. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/uaccess.h> #include <linux/bitops.h> #include <linux/string.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <linux/in.h> #include <linux/tty.h> #include <linux/errno.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/skbuff.h> #include <linux/if_arp.h> #include <linux/lapb.h> #include <linux/init.h> #include <linux/rtnetlink.h> #include <linux/slab.h> #include <net/x25device.h> #include "x25_asy.h" static struct net_device **x25_asy_devs; static int x25_asy_maxdev = SL_NRUNIT; module_param(x25_asy_maxdev, int, 0); MODULE_LICENSE("GPL"); static int x25_asy_esc(unsigned char *p, unsigned char *d, int len); static void x25_asy_unesc(struct x25_asy *sl, unsigned char c); static void x25_asy_setup(struct net_device *dev); /* Find a free X.25 channel, and link in this `tty' line. */ static struct x25_asy *x25_asy_alloc(void) { struct net_device *dev = NULL; struct x25_asy *sl; int i; if (x25_asy_devs == NULL) return NULL; /* Master array missing ! */ for (i = 0; i < x25_asy_maxdev; i++) { dev = x25_asy_devs[i]; /* Not allocated ? */ if (dev == NULL) break; sl = netdev_priv(dev); /* Not in use ? */ if (!test_and_set_bit(SLF_INUSE, &sl->flags)) return sl; } /* Sorry, too many, all slots in use */ if (i >= x25_asy_maxdev) return NULL; /* If no channels are available, allocate one */ if (!dev) { char name[IFNAMSIZ]; sprintf(name, "x25asy%d", i); dev = alloc_netdev(sizeof(struct x25_asy), name, NET_NAME_UNKNOWN, x25_asy_setup); if (!dev) return NULL; /* Initialize channel control data */ sl = netdev_priv(dev); dev->base_addr = i; /* register device so that it can be ifconfig'ed */ if (register_netdev(dev) == 0) { /* (Re-)Set the INUSE bit. Very Important! */ set_bit(SLF_INUSE, &sl->flags); x25_asy_devs[i] = dev; return sl; } else { pr_warn("%s(): register_netdev() failure\n", __func__); free_netdev(dev); } } return NULL; } /* Free an X.25 channel. */ static void x25_asy_free(struct x25_asy *sl) { /* Free all X.25 frame buffers. */ kfree(sl->rbuff); sl->rbuff = NULL; kfree(sl->xbuff); sl->xbuff = NULL; if (!test_and_clear_bit(SLF_INUSE, &sl->flags)) netdev_err(sl->dev, "x25_asy_free for already free unit\n"); } static int x25_asy_change_mtu(struct net_device *dev, int newmtu) { struct x25_asy *sl = netdev_priv(dev); unsigned char *xbuff, *rbuff; int len; len = 2 * newmtu; xbuff = kmalloc(len + 4, GFP_ATOMIC); rbuff = kmalloc(len + 4, GFP_ATOMIC); if (xbuff == NULL || rbuff == NULL) { kfree(xbuff); kfree(rbuff); return -ENOMEM; } spin_lock_bh(&sl->lock); xbuff = xchg(&sl->xbuff, xbuff); if (sl->xleft) { if (sl->xleft <= len) { memcpy(sl->xbuff, sl->xhead, sl->xleft); } else { sl->xleft = 0; dev->stats.tx_dropped++; } } sl->xhead = sl->xbuff; rbuff = xchg(&sl->rbuff, rbuff); if (sl->rcount) { if (sl->rcount <= len) { memcpy(sl->rbuff, rbuff, sl->rcount); } else { sl->rcount = 0; dev->stats.rx_over_errors++; set_bit(SLF_ERROR, &sl->flags); } } dev->mtu = newmtu; sl->buffsize = len; spin_unlock_bh(&sl->lock); kfree(xbuff); kfree(rbuff); return 0; } /* Set the "sending" flag. This must be atomic, hence the ASM. */ static inline void x25_asy_lock(struct x25_asy *sl) { netif_stop_queue(sl->dev); } /* Clear the "sending" flag. This must be atomic, hence the ASM. */ static inline void x25_asy_unlock(struct x25_asy *sl) { netif_wake_queue(sl->dev); } /* Send one completely decapsulated IP datagram to the IP layer. */ static void x25_asy_bump(struct x25_asy *sl) { struct net_device *dev = sl->dev; struct sk_buff *skb; int count; int err; count = sl->rcount; dev->stats.rx_bytes += count; skb = dev_alloc_skb(count+1); if (skb == NULL) { netdev_warn(sl->dev, "memory squeeze, dropping packet\n"); dev->stats.rx_dropped++; return; } skb_push(skb, 1); /* LAPB internal control */ skb_put_data(skb, sl->rbuff, count); skb->protocol = x25_type_trans(skb, sl->dev); err = lapb_data_received(skb->dev, skb); if (err != LAPB_OK) { kfree_skb(skb); printk(KERN_DEBUG "x25_asy: data received err - %d\n", err); } else { netif_rx(skb); dev->stats.rx_packets++; } } /* Encapsulate one IP datagram and stuff into a TTY queue. */ static void x25_asy_encaps(struct x25_asy *sl, unsigned char *icp, int len) { unsigned char *p; int actual, count, mtu = sl->dev->mtu; if (len > mtu) { /* Sigh, shouldn't occur BUT ... */ len = mtu; printk(KERN_DEBUG "%s: truncating oversized transmit packet!\n", sl->dev->name); sl->dev->stats.tx_dropped++; x25_asy_unlock(sl); return; } p = icp; count = x25_asy_esc(p, sl->xbuff, len); /* Order of next two lines is *very* important. * When we are sending a little amount of data, * the transfer may be completed inside driver.write() * routine, because it's running with interrupts enabled. * In this case we *never* got WRITE_WAKEUP event, * if we did not request it before write operation. * 14 Oct 1994 Dmitry Gorodchanin. */ set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); actual = sl->tty->ops->write(sl->tty, sl->xbuff, count); sl->xleft = count - actual; sl->xhead = sl->xbuff + actual; /* VSV */ clear_bit(SLF_OUTWAIT, &sl->flags); /* reset outfill flag */ } /* * Called by the driver when there's room for more data. If we have * more packets to send, we send them here. */ static void x25_asy_write_wakeup(struct tty_struct *tty) { int actual; struct x25_asy *sl = tty->disc_data; /* First make sure we're connected. */ if (!sl || sl->magic != X25_ASY_MAGIC || !netif_running(sl->dev)) return; if (sl->xleft <= 0) { /* Now serial buffer is almost free & we can start * transmission of another packet */ sl->dev->stats.tx_packets++; clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); x25_asy_unlock(sl); return; } actual = tty->ops->write(tty, sl->xhead, sl->xleft); sl->xleft -= actual; sl->xhead += actual; } static void x25_asy_timeout(struct net_device *dev) { struct x25_asy *sl = netdev_priv(dev); spin_lock(&sl->lock); if (netif_queue_stopped(dev)) { /* May be we must check transmitter timeout here ? * 14 Oct 1994 Dmitry Gorodchanin. */ netdev_warn(dev, "transmit timed out, %s?\n", (tty_chars_in_buffer(sl->tty) || sl->xleft) ? "bad line quality" : "driver error"); sl->xleft = 0; clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); x25_asy_unlock(sl); } spin_unlock(&sl->lock); } /* Encapsulate an IP datagram and kick it into a TTY queue. */ static netdev_tx_t x25_asy_xmit(struct sk_buff *skb, struct net_device *dev) { struct x25_asy *sl = netdev_priv(dev); int err; if (!netif_running(sl->dev)) { netdev_err(dev, "xmit call when iface is down\n"); kfree_skb(skb); return NETDEV_TX_OK; } switch (skb->data[0]) { case X25_IFACE_DATA: break; case X25_IFACE_CONNECT: /* Connection request .. do nothing */ err = lapb_connect_request(dev); if (err != LAPB_OK) netdev_err(dev, "lapb_connect_request error: %d\n", err); kfree_skb(skb); return NETDEV_TX_OK; case X25_IFACE_DISCONNECT: /* do nothing - hang up ?? */ err = lapb_disconnect_request(dev); if (err != LAPB_OK) netdev_err(dev, "lapb_disconnect_request error: %d\n", err); /* fall through */ default: kfree_skb(skb); return NETDEV_TX_OK; } skb_pull(skb, 1); /* Remove control byte */ /* * If we are busy already- too bad. We ought to be able * to queue things at this point, to allow for a little * frame buffer. Oh well... * ----------------------------------------------------- * I hate queues in X.25 driver. May be it's efficient, * but for me latency is more important. ;) * So, no queues ! * 14 Oct 1994 Dmitry Gorodchanin. */ err = lapb_data_request(dev, skb); if (err != LAPB_OK) { netdev_err(dev, "lapb_data_request error: %d\n", err); kfree_skb(skb); return NETDEV_TX_OK; } return NETDEV_TX_OK; } /* * LAPB interface boilerplate */ /* * Called when I frame data arrives. We did the work above - throw it * at the net layer. */ static int x25_asy_data_indication(struct net_device *dev, struct sk_buff *skb) { return netif_rx(skb); } /* * Data has emerged from the LAPB protocol machine. We don't handle * busy cases too well. Its tricky to see how to do this nicely - * perhaps lapb should allow us to bounce this ? */ static void x25_asy_data_transmit(struct net_device *dev, struct sk_buff *skb) { struct x25_asy *sl = netdev_priv(dev); spin_lock(&sl->lock); if (netif_queue_stopped(sl->dev) || sl->tty == NULL) { spin_unlock(&sl->lock); netdev_err(dev, "tbusy drop\n"); kfree_skb(skb); return; } /* We were not busy, so we are now... :-) */ if (skb != NULL) { x25_asy_lock(sl); dev->stats.tx_bytes += skb->len; x25_asy_encaps(sl, skb->data, skb->len); dev_kfree_skb(skb); } spin_unlock(&sl->lock); } /* * LAPB connection establish/down information. */ static void x25_asy_connected(struct net_device *dev, int reason) { struct x25_asy *sl = netdev_priv(dev); struct sk_buff *skb; unsigned char *ptr; skb = dev_alloc_skb(1); if (skb == NULL) { netdev_err(dev, "out of memory\n"); return; } ptr = skb_put(skb, 1); *ptr = X25_IFACE_CONNECT; skb->protocol = x25_type_trans(skb, sl->dev); netif_rx(skb); } static void x25_asy_disconnected(struct net_device *dev, int reason) { struct x25_asy *sl = netdev_priv(dev); struct sk_buff *skb; unsigned char *ptr; skb = dev_alloc_skb(1); if (skb == NULL) { netdev_err(dev, "out of memory\n"); return; } ptr = skb_put(skb, 1); *ptr = X25_IFACE_DISCONNECT; skb->protocol = x25_type_trans(skb, sl->dev); netif_rx(skb); } static const struct lapb_register_struct x25_asy_callbacks = { .connect_confirmation = x25_asy_connected, .connect_indication = x25_asy_connected, .disconnect_confirmation = x25_asy_disconnected, .disconnect_indication = x25_asy_disconnected, .data_indication = x25_asy_data_indication, .data_transmit = x25_asy_data_transmit, }; /* Open the low-level part of the X.25 channel. Easy! */ static int x25_asy_open(struct net_device *dev) { struct x25_asy *sl = netdev_priv(dev); unsigned long len; int err; if (sl->tty == NULL) return -ENODEV; /* * Allocate the X.25 frame buffers: * * rbuff Receive buffer. * xbuff Transmit buffer. */ len = dev->mtu * 2; sl->rbuff = kmalloc(len + 4, GFP_KERNEL); if (sl->rbuff == NULL) goto norbuff; sl->xbuff = kmalloc(len + 4, GFP_KERNEL); if (sl->xbuff == NULL) goto noxbuff; sl->buffsize = len; sl->rcount = 0; sl->xleft = 0; sl->flags &= (1 << SLF_INUSE); /* Clear ESCAPE & ERROR flags */ netif_start_queue(dev); /* * Now attach LAPB */ err = lapb_register(dev, &x25_asy_callbacks); if (err == LAPB_OK) return 0; /* Cleanup */ kfree(sl->xbuff); sl->xbuff = NULL; noxbuff: kfree(sl->rbuff); sl->rbuff = NULL; norbuff: return -ENOMEM; } /* Close the low-level part of the X.25 channel. Easy! */ static int x25_asy_close(struct net_device *dev) { struct x25_asy *sl = netdev_priv(dev); spin_lock(&sl->lock); if (sl->tty) clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags); netif_stop_queue(dev); sl->rcount = 0; sl->xleft = 0; spin_unlock(&sl->lock); return 0; } /* * 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. */ static void x25_asy_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count) { struct x25_asy *sl = tty->disc_data; if (!sl || sl->magic != X25_ASY_MAGIC || !netif_running(sl->dev)) return; /* 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; int err; /* 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(); err = lapb_unregister(sl->dev); if (err != LAPB_OK) pr_err("x25_asy_close: lapb_unregister error: %d\n", err); 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) { struct x25_asy *sl = netdev_priv(dev); if (sl->tty == NULL) return -ENODEV; return 0; } static const struct net_device_ops x25_asy_netdev_ops = { .ndo_open = x25_asy_open_dev, .ndo_stop = x25_asy_close, .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; /* 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);
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