543 строки
11 KiB
C
543 строки
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* DLCI Implementation of Frame Relay protocol for Linux, according to
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* RFC 1490. This generic device provides en/decapsulation for an
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* underlying hardware driver. Routes & IPs are assigned to these
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* interfaces. Requires 'dlcicfg' program to create usable
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* interfaces, the initial one, 'dlci' is for IOCTL use only.
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*
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* Version: @(#)dlci.c 0.35 4 Jan 1997
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*
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* Author: Mike McLagan <mike.mclagan@linux.org>
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*
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* Changes:
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*
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* 0.15 Mike Mclagan Packet freeing, bug in kmalloc call
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* DLCI_RET handling
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* 0.20 Mike McLagan More conservative on which packets
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* are returned for retry and which are
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* are dropped. If DLCI_RET_DROP is
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* returned from the FRAD, the packet is
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* sent back to Linux for re-transmission
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* 0.25 Mike McLagan Converted to use SIOC IOCTL calls
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* 0.30 Jim Freeman Fixed to allow IPX traffic
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* 0.35 Michael Elizabeth Fixed incorrect memcpy_fromfs
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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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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/ptrace.h>
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#include <linux/ioport.h>
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#include <linux/in.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/if_frad.h>
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#include <linux/bitops.h>
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#include <net/sock.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <linux/uaccess.h>
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static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org";
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static LIST_HEAD(dlci_devs);
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static void dlci_setup(struct net_device *);
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/*
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* these encapsulate the RFC 1490 requirements as well as
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* deal with packet transmission and reception, working with
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* the upper network layers
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*/
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static int dlci_header(struct sk_buff *skb, struct net_device *dev,
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unsigned short type, const void *daddr,
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const void *saddr, unsigned len)
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{
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struct frhdr hdr;
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unsigned int hlen;
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char *dest;
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hdr.control = FRAD_I_UI;
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switch (type)
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{
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case ETH_P_IP:
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hdr.IP_NLPID = FRAD_P_IP;
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hlen = sizeof(hdr.control) + sizeof(hdr.IP_NLPID);
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break;
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/* feel free to add other types, if necessary */
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default:
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hdr.pad = FRAD_P_PADDING;
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hdr.NLPID = FRAD_P_SNAP;
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memset(hdr.OUI, 0, sizeof(hdr.OUI));
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hdr.PID = htons(type);
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hlen = sizeof(hdr);
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break;
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}
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dest = skb_push(skb, hlen);
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if (!dest)
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return 0;
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memcpy(dest, &hdr, hlen);
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return hlen;
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}
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static void dlci_receive(struct sk_buff *skb, struct net_device *dev)
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{
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struct frhdr *hdr;
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int process, header;
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if (!pskb_may_pull(skb, sizeof(*hdr))) {
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netdev_notice(dev, "invalid data no header\n");
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dev->stats.rx_errors++;
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kfree_skb(skb);
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return;
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}
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hdr = (struct frhdr *) skb->data;
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process = 0;
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header = 0;
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skb->dev = dev;
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if (hdr->control != FRAD_I_UI)
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{
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netdev_notice(dev, "Invalid header flag 0x%02X\n",
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hdr->control);
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dev->stats.rx_errors++;
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}
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else
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switch (hdr->IP_NLPID)
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{
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case FRAD_P_PADDING:
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if (hdr->NLPID != FRAD_P_SNAP)
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{
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netdev_notice(dev, "Unsupported NLPID 0x%02X\n",
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hdr->NLPID);
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dev->stats.rx_errors++;
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break;
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}
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if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0)
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{
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netdev_notice(dev, "Unsupported organizationally unique identifier 0x%02X-%02X-%02X\n",
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hdr->OUI[0],
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hdr->OUI[1],
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hdr->OUI[2]);
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dev->stats.rx_errors++;
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break;
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}
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/* at this point, it's an EtherType frame */
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header = sizeof(struct frhdr);
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/* Already in network order ! */
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skb->protocol = hdr->PID;
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process = 1;
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break;
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case FRAD_P_IP:
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header = sizeof(hdr->control) + sizeof(hdr->IP_NLPID);
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skb->protocol = htons(ETH_P_IP);
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process = 1;
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break;
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case FRAD_P_SNAP:
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case FRAD_P_Q933:
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case FRAD_P_CLNP:
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netdev_notice(dev, "Unsupported NLPID 0x%02X\n",
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hdr->pad);
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dev->stats.rx_errors++;
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break;
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default:
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netdev_notice(dev, "Invalid pad byte 0x%02X\n",
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hdr->pad);
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dev->stats.rx_errors++;
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break;
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}
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if (process)
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{
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/* we've set up the protocol, so discard the header */
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skb_reset_mac_header(skb);
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skb_pull(skb, header);
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dev->stats.rx_bytes += skb->len;
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netif_rx(skb);
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dev->stats.rx_packets++;
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}
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else
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dev_kfree_skb(skb);
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}
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static netdev_tx_t dlci_transmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dlci_local *dlp = netdev_priv(dev);
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if (skb) {
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struct netdev_queue *txq = skb_get_tx_queue(dev, skb);
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netdev_start_xmit(skb, dlp->slave, txq, false);
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}
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return NETDEV_TX_OK;
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}
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static int dlci_config(struct net_device *dev, struct dlci_conf __user *conf, int get)
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{
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struct dlci_conf config;
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struct dlci_local *dlp;
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struct frad_local *flp;
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int err;
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dlp = netdev_priv(dev);
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flp = netdev_priv(dlp->slave);
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if (!get)
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{
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if (copy_from_user(&config, conf, sizeof(struct dlci_conf)))
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return -EFAULT;
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if (config.flags & ~DLCI_VALID_FLAGS)
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return -EINVAL;
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memcpy(&dlp->config, &config, sizeof(struct dlci_conf));
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dlp->configured = 1;
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}
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err = (*flp->dlci_conf)(dlp->slave, dev, get);
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if (err)
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return err;
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if (get)
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{
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if (copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf)))
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return -EFAULT;
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}
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return 0;
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}
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static int dlci_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
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{
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struct dlci_local *dlp;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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dlp = netdev_priv(dev);
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switch (cmd)
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{
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case DLCI_GET_SLAVE:
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if (!*(short *)(dev->dev_addr))
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return -EINVAL;
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strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave));
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break;
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case DLCI_GET_CONF:
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case DLCI_SET_CONF:
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if (!*(short *)(dev->dev_addr))
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return -EINVAL;
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return dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF);
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int dlci_change_mtu(struct net_device *dev, int new_mtu)
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{
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struct dlci_local *dlp = netdev_priv(dev);
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return dev_set_mtu(dlp->slave, new_mtu);
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}
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static int dlci_open(struct net_device *dev)
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{
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struct dlci_local *dlp;
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struct frad_local *flp;
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int err;
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dlp = netdev_priv(dev);
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if (!*(short *)(dev->dev_addr))
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return -EINVAL;
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if (!netif_running(dlp->slave))
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return -ENOTCONN;
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flp = netdev_priv(dlp->slave);
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err = (*flp->activate)(dlp->slave, dev);
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if (err)
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return err;
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netif_start_queue(dev);
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return 0;
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}
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static int dlci_close(struct net_device *dev)
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{
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struct dlci_local *dlp;
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struct frad_local *flp;
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int err;
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netif_stop_queue(dev);
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dlp = netdev_priv(dev);
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flp = netdev_priv(dlp->slave);
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err = (*flp->deactivate)(dlp->slave, dev);
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return 0;
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}
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static int dlci_add(struct dlci_add *dlci)
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{
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struct net_device *master, *slave;
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struct dlci_local *dlp;
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struct frad_local *flp;
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int err = -EINVAL;
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/* validate slave device */
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slave = dev_get_by_name(&init_net, dlci->devname);
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if (!slave)
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return -ENODEV;
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if (slave->type != ARPHRD_FRAD || netdev_priv(slave) == NULL)
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goto err1;
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/* create device name */
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master = alloc_netdev(sizeof(struct dlci_local), "dlci%d",
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NET_NAME_UNKNOWN, dlci_setup);
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if (!master) {
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err = -ENOMEM;
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goto err1;
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}
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/* make sure same slave not already registered */
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rtnl_lock();
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list_for_each_entry(dlp, &dlci_devs, list) {
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if (dlp->slave == slave) {
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err = -EBUSY;
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goto err2;
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}
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}
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*(short *)(master->dev_addr) = dlci->dlci;
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dlp = netdev_priv(master);
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dlp->slave = slave;
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dlp->master = master;
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flp = netdev_priv(slave);
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err = (*flp->assoc)(slave, master);
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if (err < 0)
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goto err2;
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err = register_netdevice(master);
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if (err < 0)
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goto err2;
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strcpy(dlci->devname, master->name);
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list_add(&dlp->list, &dlci_devs);
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rtnl_unlock();
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return 0;
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err2:
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rtnl_unlock();
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free_netdev(master);
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err1:
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dev_put(slave);
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return err;
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}
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static int dlci_del(struct dlci_add *dlci)
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{
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struct dlci_local *dlp;
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struct frad_local *flp;
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struct net_device *master, *slave;
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int err;
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bool found = false;
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rtnl_lock();
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/* validate slave device */
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master = __dev_get_by_name(&init_net, dlci->devname);
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if (!master) {
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err = -ENODEV;
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goto out;
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}
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list_for_each_entry(dlp, &dlci_devs, list) {
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if (dlp->master == master) {
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found = true;
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break;
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}
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}
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if (!found) {
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err = -ENODEV;
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goto out;
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}
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if (netif_running(master)) {
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err = -EBUSY;
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goto out;
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}
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dlp = netdev_priv(master);
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slave = dlp->slave;
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flp = netdev_priv(slave);
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err = (*flp->deassoc)(slave, master);
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if (!err) {
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list_del(&dlp->list);
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unregister_netdevice(master);
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dev_put(slave);
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}
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out:
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rtnl_unlock();
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return err;
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}
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static int dlci_ioctl(unsigned int cmd, void __user *arg)
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{
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struct dlci_add add;
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int err;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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if (copy_from_user(&add, arg, sizeof(struct dlci_add)))
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return -EFAULT;
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switch (cmd)
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{
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case SIOCADDDLCI:
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err = dlci_add(&add);
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if (!err)
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if (copy_to_user(arg, &add, sizeof(struct dlci_add)))
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return -EFAULT;
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break;
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case SIOCDELDLCI:
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err = dlci_del(&add);
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break;
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default:
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err = -EINVAL;
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}
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return err;
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}
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static const struct header_ops dlci_header_ops = {
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.create = dlci_header,
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};
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static const struct net_device_ops dlci_netdev_ops = {
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.ndo_open = dlci_open,
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.ndo_stop = dlci_close,
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.ndo_do_ioctl = dlci_dev_ioctl,
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.ndo_start_xmit = dlci_transmit,
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.ndo_change_mtu = dlci_change_mtu,
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};
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static void dlci_setup(struct net_device *dev)
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{
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struct dlci_local *dlp = netdev_priv(dev);
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dev->flags = 0;
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dev->header_ops = &dlci_header_ops;
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dev->netdev_ops = &dlci_netdev_ops;
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dev->needs_free_netdev = true;
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dlp->receive = dlci_receive;
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dev->type = ARPHRD_DLCI;
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dev->hard_header_len = sizeof(struct frhdr);
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dev->addr_len = sizeof(short);
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}
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/* if slave is unregistering, then cleanup master */
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static int dlci_dev_event(struct notifier_block *unused,
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unsigned long event, void *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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if (dev_net(dev) != &init_net)
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return NOTIFY_DONE;
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if (event == NETDEV_UNREGISTER) {
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struct dlci_local *dlp;
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list_for_each_entry(dlp, &dlci_devs, list) {
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if (dlp->slave == dev) {
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list_del(&dlp->list);
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unregister_netdevice(dlp->master);
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dev_put(dlp->slave);
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break;
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}
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}
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block dlci_notifier = {
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.notifier_call = dlci_dev_event,
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};
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static int __init init_dlci(void)
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{
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dlci_ioctl_set(dlci_ioctl);
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register_netdevice_notifier(&dlci_notifier);
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printk("%s.\n", version);
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return 0;
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}
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static void __exit dlci_exit(void)
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{
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struct dlci_local *dlp, *nxt;
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dlci_ioctl_set(NULL);
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unregister_netdevice_notifier(&dlci_notifier);
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rtnl_lock();
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list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {
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unregister_netdevice(dlp->master);
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dev_put(dlp->slave);
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}
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rtnl_unlock();
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}
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module_init(init_dlci);
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module_exit(dlci_exit);
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MODULE_AUTHOR("Mike McLagan");
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MODULE_DESCRIPTION("Frame Relay DLCI layer");
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MODULE_LICENSE("GPL");
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