| /* |
| * DLCI Implementation of Frame Relay protocol for Linux, according to |
| * RFC 1490. This generic device provides en/decapsulation for an |
| * underlying hardware driver. Routes & IPs are assigned to these |
| * interfaces. Requires 'dlcicfg' program to create usable |
| * interfaces, the initial one, 'dlci' is for IOCTL use only. |
| * |
| * Version: @(#)dlci.c 0.35 4 Jan 1997 |
| * |
| * Author: Mike McLagan <mike.mclagan@linux.org> |
| * |
| * Changes: |
| * |
| * 0.15 Mike Mclagan Packet freeing, bug in kmalloc call |
| * DLCI_RET handling |
| * 0.20 Mike McLagan More conservative on which packets |
| * are returned for retry and which are |
| * are dropped. If DLCI_RET_DROP is |
| * returned from the FRAD, the packet is |
| * sent back to Linux for re-transmission |
| * 0.25 Mike McLagan Converted to use SIOC IOCTL calls |
| * 0.30 Jim Freeman Fixed to allow IPX traffic |
| * 0.35 Michael Elizabeth Fixed incorrect memcpy_fromfs |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/types.h> |
| #include <linux/fcntl.h> |
| #include <linux/interrupt.h> |
| #include <linux/ptrace.h> |
| #include <linux/ioport.h> |
| #include <linux/in.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/string.h> |
| #include <linux/errno.h> |
| #include <linux/netdevice.h> |
| #include <linux/skbuff.h> |
| #include <linux/if_arp.h> |
| #include <linux/if_frad.h> |
| #include <linux/bitops.h> |
| |
| #include <net/sock.h> |
| |
| #include <asm/system.h> |
| #include <asm/io.h> |
| #include <asm/dma.h> |
| #include <asm/uaccess.h> |
| |
| static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org"; |
| |
| static LIST_HEAD(dlci_devs); |
| |
| static void dlci_setup(struct net_device *); |
| |
| /* |
| * these encapsulate the RFC 1490 requirements as well as |
| * deal with packet transmission and reception, working with |
| * the upper network layers |
| */ |
| |
| static int dlci_header(struct sk_buff *skb, struct net_device *dev, |
| unsigned short type, void *daddr, void *saddr, |
| unsigned len) |
| { |
| struct frhdr hdr; |
| struct dlci_local *dlp; |
| unsigned int hlen; |
| char *dest; |
| |
| dlp = dev->priv; |
| |
| hdr.control = FRAD_I_UI; |
| switch(type) |
| { |
| case ETH_P_IP: |
| hdr.IP_NLPID = FRAD_P_IP; |
| hlen = sizeof(hdr.control) + sizeof(hdr.IP_NLPID); |
| break; |
| |
| /* feel free to add other types, if necessary */ |
| |
| default: |
| hdr.pad = FRAD_P_PADDING; |
| hdr.NLPID = FRAD_P_SNAP; |
| memset(hdr.OUI, 0, sizeof(hdr.OUI)); |
| hdr.PID = htons(type); |
| hlen = sizeof(hdr); |
| break; |
| } |
| |
| dest = skb_push(skb, hlen); |
| if (!dest) |
| return(0); |
| |
| memcpy(dest, &hdr, hlen); |
| |
| return(hlen); |
| } |
| |
| static void dlci_receive(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct dlci_local *dlp; |
| struct frhdr *hdr; |
| int process, header; |
| |
| dlp = dev->priv; |
| if (!pskb_may_pull(skb, sizeof(*hdr))) { |
| printk(KERN_NOTICE "%s: invalid data no header\n", |
| dev->name); |
| dlp->stats.rx_errors++; |
| kfree_skb(skb); |
| return; |
| } |
| |
| hdr = (struct frhdr *) skb->data; |
| process = 0; |
| header = 0; |
| skb->dev = dev; |
| |
| if (hdr->control != FRAD_I_UI) |
| { |
| printk(KERN_NOTICE "%s: Invalid header flag 0x%02X.\n", dev->name, hdr->control); |
| dlp->stats.rx_errors++; |
| } |
| else |
| switch(hdr->IP_NLPID) |
| { |
| case FRAD_P_PADDING: |
| if (hdr->NLPID != FRAD_P_SNAP) |
| { |
| printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->NLPID); |
| dlp->stats.rx_errors++; |
| break; |
| } |
| |
| if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0) |
| { |
| printk(KERN_NOTICE "%s: Unsupported organizationally unique identifier 0x%02X-%02X-%02X.\n", dev->name, hdr->OUI[0], hdr->OUI[1], hdr->OUI[2]); |
| dlp->stats.rx_errors++; |
| break; |
| } |
| |
| /* at this point, it's an EtherType frame */ |
| header = sizeof(struct frhdr); |
| /* Already in network order ! */ |
| skb->protocol = hdr->PID; |
| process = 1; |
| break; |
| |
| case FRAD_P_IP: |
| header = sizeof(hdr->control) + sizeof(hdr->IP_NLPID); |
| skb->protocol = htons(ETH_P_IP); |
| process = 1; |
| break; |
| |
| case FRAD_P_SNAP: |
| case FRAD_P_Q933: |
| case FRAD_P_CLNP: |
| printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->pad); |
| dlp->stats.rx_errors++; |
| break; |
| |
| default: |
| printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad); |
| dlp->stats.rx_errors++; |
| break; |
| } |
| |
| if (process) |
| { |
| /* we've set up the protocol, so discard the header */ |
| skb_reset_mac_header(skb); |
| skb_pull(skb, header); |
| dlp->stats.rx_bytes += skb->len; |
| netif_rx(skb); |
| dlp->stats.rx_packets++; |
| dev->last_rx = jiffies; |
| } |
| else |
| dev_kfree_skb(skb); |
| } |
| |
| static int dlci_transmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct dlci_local *dlp; |
| int ret; |
| |
| ret = 0; |
| |
| if (!skb || !dev) |
| return(0); |
| |
| dlp = dev->priv; |
| |
| netif_stop_queue(dev); |
| |
| ret = dlp->slave->hard_start_xmit(skb, dlp->slave); |
| switch (ret) |
| { |
| case DLCI_RET_OK: |
| dlp->stats.tx_packets++; |
| ret = 0; |
| break; |
| case DLCI_RET_ERR: |
| dlp->stats.tx_errors++; |
| ret = 0; |
| break; |
| case DLCI_RET_DROP: |
| dlp->stats.tx_dropped++; |
| ret = 1; |
| break; |
| } |
| /* Alan Cox recommends always returning 0, and always freeing the packet */ |
| /* experience suggest a slightly more conservative approach */ |
| |
| if (!ret) |
| { |
| dev_kfree_skb(skb); |
| netif_wake_queue(dev); |
| } |
| return(ret); |
| } |
| |
| static int dlci_config(struct net_device *dev, struct dlci_conf __user *conf, int get) |
| { |
| struct dlci_conf config; |
| struct dlci_local *dlp; |
| struct frad_local *flp; |
| int err; |
| |
| dlp = dev->priv; |
| |
| flp = dlp->slave->priv; |
| |
| if (!get) |
| { |
| if(copy_from_user(&config, conf, sizeof(struct dlci_conf))) |
| return -EFAULT; |
| if (config.flags & ~DLCI_VALID_FLAGS) |
| return(-EINVAL); |
| memcpy(&dlp->config, &config, sizeof(struct dlci_conf)); |
| dlp->configured = 1; |
| } |
| |
| err = (*flp->dlci_conf)(dlp->slave, dev, get); |
| if (err) |
| return(err); |
| |
| if (get) |
| { |
| if(copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf))) |
| return -EFAULT; |
| } |
| |
| return(0); |
| } |
| |
| static int dlci_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| { |
| struct dlci_local *dlp; |
| |
| if (!capable(CAP_NET_ADMIN)) |
| return(-EPERM); |
| |
| dlp = dev->priv; |
| |
| switch(cmd) |
| { |
| case DLCI_GET_SLAVE: |
| if (!*(short *)(dev->dev_addr)) |
| return(-EINVAL); |
| |
| strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave)); |
| break; |
| |
| case DLCI_GET_CONF: |
| case DLCI_SET_CONF: |
| if (!*(short *)(dev->dev_addr)) |
| return(-EINVAL); |
| |
| return(dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF)); |
| break; |
| |
| default: |
| return(-EOPNOTSUPP); |
| } |
| return(0); |
| } |
| |
| static int dlci_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| struct dlci_local *dlp; |
| |
| dlp = dev->priv; |
| |
| return((*dlp->slave->change_mtu)(dlp->slave, new_mtu)); |
| } |
| |
| static int dlci_open(struct net_device *dev) |
| { |
| struct dlci_local *dlp; |
| struct frad_local *flp; |
| int err; |
| |
| dlp = dev->priv; |
| |
| if (!*(short *)(dev->dev_addr)) |
| return(-EINVAL); |
| |
| if (!netif_running(dlp->slave)) |
| return(-ENOTCONN); |
| |
| flp = dlp->slave->priv; |
| err = (*flp->activate)(dlp->slave, dev); |
| if (err) |
| return(err); |
| |
| netif_start_queue(dev); |
| |
| return 0; |
| } |
| |
| static int dlci_close(struct net_device *dev) |
| { |
| struct dlci_local *dlp; |
| struct frad_local *flp; |
| int err; |
| |
| netif_stop_queue(dev); |
| |
| dlp = dev->priv; |
| |
| flp = dlp->slave->priv; |
| err = (*flp->deactivate)(dlp->slave, dev); |
| |
| return 0; |
| } |
| |
| static struct net_device_stats *dlci_get_stats(struct net_device *dev) |
| { |
| struct dlci_local *dlp; |
| |
| dlp = dev->priv; |
| |
| return(&dlp->stats); |
| } |
| |
| static int dlci_add(struct dlci_add *dlci) |
| { |
| struct net_device *master, *slave; |
| struct dlci_local *dlp; |
| struct frad_local *flp; |
| int err = -EINVAL; |
| |
| |
| /* validate slave device */ |
| slave = dev_get_by_name(dlci->devname); |
| if (!slave) |
| return -ENODEV; |
| |
| if (slave->type != ARPHRD_FRAD || slave->priv == NULL) |
| goto err1; |
| |
| /* create device name */ |
| master = alloc_netdev( sizeof(struct dlci_local), "dlci%d", |
| dlci_setup); |
| if (!master) { |
| err = -ENOMEM; |
| goto err1; |
| } |
| |
| /* make sure same slave not already registered */ |
| rtnl_lock(); |
| list_for_each_entry(dlp, &dlci_devs, list) { |
| if (dlp->slave == slave) { |
| err = -EBUSY; |
| goto err2; |
| } |
| } |
| |
| err = dev_alloc_name(master, master->name); |
| if (err < 0) |
| goto err2; |
| |
| *(short *)(master->dev_addr) = dlci->dlci; |
| |
| dlp = (struct dlci_local *) master->priv; |
| dlp->slave = slave; |
| dlp->master = master; |
| |
| flp = slave->priv; |
| err = (*flp->assoc)(slave, master); |
| if (err < 0) |
| goto err2; |
| |
| err = register_netdevice(master); |
| if (err < 0) |
| goto err2; |
| |
| strcpy(dlci->devname, master->name); |
| |
| list_add(&dlp->list, &dlci_devs); |
| rtnl_unlock(); |
| |
| return(0); |
| |
| err2: |
| rtnl_unlock(); |
| free_netdev(master); |
| err1: |
| dev_put(slave); |
| return(err); |
| } |
| |
| static int dlci_del(struct dlci_add *dlci) |
| { |
| struct dlci_local *dlp; |
| struct frad_local *flp; |
| struct net_device *master, *slave; |
| int err; |
| |
| /* validate slave device */ |
| master = __dev_get_by_name(dlci->devname); |
| if (!master) |
| return(-ENODEV); |
| |
| if (netif_running(master)) { |
| return(-EBUSY); |
| } |
| |
| dlp = master->priv; |
| slave = dlp->slave; |
| flp = slave->priv; |
| |
| rtnl_lock(); |
| err = (*flp->deassoc)(slave, master); |
| if (!err) { |
| list_del(&dlp->list); |
| |
| unregister_netdevice(master); |
| |
| dev_put(slave); |
| } |
| rtnl_unlock(); |
| |
| return(err); |
| } |
| |
| static int dlci_ioctl(unsigned int cmd, void __user *arg) |
| { |
| struct dlci_add add; |
| int err; |
| |
| if (!capable(CAP_NET_ADMIN)) |
| return(-EPERM); |
| |
| if(copy_from_user(&add, arg, sizeof(struct dlci_add))) |
| return -EFAULT; |
| |
| switch (cmd) |
| { |
| case SIOCADDDLCI: |
| err = dlci_add(&add); |
| |
| if (!err) |
| if(copy_to_user(arg, &add, sizeof(struct dlci_add))) |
| return -EFAULT; |
| break; |
| |
| case SIOCDELDLCI: |
| err = dlci_del(&add); |
| break; |
| |
| default: |
| err = -EINVAL; |
| } |
| |
| return(err); |
| } |
| |
| static void dlci_setup(struct net_device *dev) |
| { |
| struct dlci_local *dlp = dev->priv; |
| |
| dev->flags = 0; |
| dev->open = dlci_open; |
| dev->stop = dlci_close; |
| dev->do_ioctl = dlci_dev_ioctl; |
| dev->hard_start_xmit = dlci_transmit; |
| dev->hard_header = dlci_header; |
| dev->get_stats = dlci_get_stats; |
| dev->change_mtu = dlci_change_mtu; |
| dev->destructor = free_netdev; |
| |
| dlp->receive = dlci_receive; |
| |
| dev->type = ARPHRD_DLCI; |
| dev->hard_header_len = sizeof(struct frhdr); |
| dev->addr_len = sizeof(short); |
| |
| } |
| |
| /* if slave is unregistering, then cleanup master */ |
| static int dlci_dev_event(struct notifier_block *unused, |
| unsigned long event, void *ptr) |
| { |
| struct net_device *dev = (struct net_device *) ptr; |
| |
| if (event == NETDEV_UNREGISTER) { |
| struct dlci_local *dlp; |
| |
| list_for_each_entry(dlp, &dlci_devs, list) { |
| if (dlp->slave == dev) { |
| list_del(&dlp->list); |
| unregister_netdevice(dlp->master); |
| dev_put(dlp->slave); |
| break; |
| } |
| } |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block dlci_notifier = { |
| .notifier_call = dlci_dev_event, |
| }; |
| |
| static int __init init_dlci(void) |
| { |
| dlci_ioctl_set(dlci_ioctl); |
| register_netdevice_notifier(&dlci_notifier); |
| |
| printk("%s.\n", version); |
| |
| return 0; |
| } |
| |
| static void __exit dlci_exit(void) |
| { |
| struct dlci_local *dlp, *nxt; |
| |
| dlci_ioctl_set(NULL); |
| unregister_netdevice_notifier(&dlci_notifier); |
| |
| rtnl_lock(); |
| list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) { |
| unregister_netdevice(dlp->master); |
| dev_put(dlp->slave); |
| } |
| rtnl_unlock(); |
| } |
| |
| module_init(init_dlci); |
| module_exit(dlci_exit); |
| |
| MODULE_AUTHOR("Mike McLagan"); |
| MODULE_DESCRIPTION("Frame Relay DLCI layer"); |
| MODULE_LICENSE("GPL"); |