patch-2.4.21 linux-2.4.21/drivers/net/wan/hdlc_fr.c

• Lines: 863
• Date: 2003-06-13 07:51:35.000000000 -0700
• Orig file: linux-2.4.20/drivers/net/wan/hdlc_fr.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.20/drivers/net/wan/hdlc_fr.c linux-2.4.21/drivers/net/wan/hdlc_fr.c
@@ -0,0 +1,862 @@
+/*
+ * Generic HDLC support routines for Linux
+ * Frame Relay support
+ *
+ * Copyright (C) 1999 - 2001 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * 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/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/errno.h>
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/pkt_sched.h>
+#include <linux/inetdevice.h>
+#include <linux/lapb.h>
+#include <linux/rtnetlink.h>
+#include <linux/hdlc.h>
+
+
+__inline__ pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
+{
+	pvc_device *pvc=hdlc->state.fr.first_pvc;
+	
+	while (pvc) {
+		if (netdev_dlci(&pvc->netdev) == dlci)
+			return pvc;
+		pvc = pvc->next;
+	}
+
+	return NULL;
+}
+
+
+
+__inline__ u16 status_to_dlci(hdlc_device *hdlc, u8 *status,
+			      int *active, int *new)
+{
+	*new = (status[2] & 0x08);
+	*active = (!*new && (status[2] & 0x02));
+
+	return ((status[0] & 0x3F)<<4) | ((status[1] & 0x78)>>3);
+}
+
+
+__inline__ void dlci_to_status(hdlc_device *hdlc, u16 dlci, u8 *status,
+			       int active, int new)
+{
+	status[0] = (dlci>>4) & 0x3F;
+	status[1] = ((dlci<<3) & 0x78) | 0x80;
+	status[2] = 0x80;
+
+	if (new)
+		status[2] |= 0x08;
+	else if (active)
+		status[2] |= 0x02;
+}
+
+
+
+static int fr_hard_header(struct sk_buff *skb, struct net_device *dev,
+			  u16 type, void *daddr, void *saddr, unsigned int len)
+{
+	u16 head_len;
+
+	if (!daddr)
+		daddr = dev->broadcast;
+
+#ifdef CONFIG_HDLC_DEBUG_HARD_HEADER
+	printk(KERN_DEBUG "%s: fr_hard_header called\n", dev->name);
+#endif
+
+	switch(type) {
+	case ETH_P_IP:
+		head_len = 4;
+		skb_push(skb, head_len);
+		skb->data[3] = NLPID_IP;
+		break;
+
+	case ETH_P_IPV6:
+		head_len = 4;
+		skb_push(skb, head_len);
+		skb->data[3] = NLPID_IPV6;
+		break;
+
+	case LMI_PROTO:
+		head_len = 4;
+		skb_push(skb, head_len);
+		skb->data[3] = LMI_PROTO;
+		break;
+
+	default:
+		head_len = 10;
+		skb_push(skb, head_len);
+		skb->data[3] = FR_PAD;
+		skb->data[4] = NLPID_SNAP;
+		skb->data[5] = FR_PAD;
+		skb->data[6] = FR_PAD;
+		skb->data[7] = FR_PAD;
+		skb->data[8] = type>>8;
+		skb->data[9] = (u8)type;
+	}
+
+	memcpy(skb->data, daddr, 2);
+	skb->data[2] = FR_UI;
+
+	return head_len;
+}
+
+
+
+static int pvc_open(struct net_device *dev)
+{
+	pvc_device *pvc = dev_to_pvc(dev);
+
+	if ((hdlc_to_dev(pvc->master)->flags & IFF_UP) == 0)
+		return -EIO;  /* Master must be UP in order to activate PVC */
+
+	if (pvc->master->state.fr.settings.lmi != LMI_NONE)
+		pvc->state.active = 0;
+	else
+		pvc->state.active = 1;
+
+	pvc->state.new = 0;
+	pvc->master->state.fr.changed = 1;
+	return 0;
+}
+
+
+
+static int pvc_close(struct net_device *dev)
+{
+	pvc_device *pvc = dev_to_pvc(dev);
+	pvc->state.active = pvc->state.new = 0;
+	pvc->master->state.fr.changed = 1;
+	return 0;
+}
+
+
+
+static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	pvc_device *pvc = dev_to_pvc(dev);
+
+	if (pvc->state.active) {
+		skb->dev = hdlc_to_dev(pvc->master);
+		pvc->stats.tx_bytes += skb->len;
+		pvc->stats.tx_packets++;
+		if (pvc->state.fecn)
+			pvc->stats.tx_compressed++; /* TX Congestion counter */
+		dev_queue_xmit(skb);
+	} else {
+		pvc->stats.tx_dropped++;
+		dev_kfree_skb(skb);
+	}
+
+	return 0;
+}
+
+
+
+static struct net_device_stats *pvc_get_stats(struct net_device *dev)
+{
+	pvc_device *pvc = dev_to_pvc(dev);
+	return &pvc->stats;
+}
+
+
+
+static int pvc_change_mtu(struct net_device *dev, int new_mtu)
+{
+	if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
+		return -EINVAL;
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+
+
+static inline void fr_log_dlci_active(pvc_device *pvc)
+{
+	printk(KERN_INFO "%s: %sactive%s\n", pvc_to_name(pvc),
+	       pvc->state.active ? "" : "in",
+	       pvc->state.new ? " new" : "");
+}
+
+
+
+static inline u8 fr_lmi_nextseq(u8 x)
+{
+	x++;
+	return x ? x : 1;
+}
+
+
+
+static void fr_lmi_send(hdlc_device *hdlc, int fullrep)
+{
+	struct sk_buff *skb;
+	pvc_device *pvc = hdlc->state.fr.first_pvc;
+	int len = (hdlc->state.fr.settings.lmi == LMI_ANSI) ? LMI_ANSI_LENGTH
+		: LMI_LENGTH;
+	int stat_len = 3;
+	u8 *data;
+	int i = 0;
+
+	if (hdlc->state.fr.settings.dce && fullrep) {
+		len += hdlc->state.fr.pvc_count * (2 + stat_len);
+		if (len > HDLC_MAX_MTU) {
+			printk(KERN_WARNING "%s: Too many PVCs while sending "
+			       "LMI full report\n", hdlc_to_name(hdlc));
+			return;
+		}
+	}
+
+	skb = dev_alloc_skb(len);
+	if (!skb) {
+		printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
+			       hdlc_to_name(hdlc));
+		return;
+	}
+	memset(skb->data, 0, len);
+	skb_reserve(skb, 4);
+	fr_hard_header(skb, hdlc_to_dev(hdlc), LMI_PROTO, NULL, NULL, 0);
+	data = skb->tail;
+	data[i++] = LMI_CALLREF;
+	data[i++] = hdlc->state.fr.settings.dce
+		? LMI_STATUS : LMI_STATUS_ENQUIRY;
+	if (hdlc->state.fr.settings.lmi == LMI_ANSI)
+		data[i++] = LMI_ANSI_LOCKSHIFT;
+	data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
+		? LMI_CCITT_REPTYPE : LMI_REPTYPE;
+	data[i++] = LMI_REPT_LEN;
+	data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
+
+	data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
+		? LMI_CCITT_ALIVE : LMI_ALIVE;
+	data[i++] = LMI_INTEG_LEN;
+	data[i++] = hdlc->state.fr.txseq =fr_lmi_nextseq(hdlc->state.fr.txseq);
+	data[i++] = hdlc->state.fr.rxseq;
+
+	if (hdlc->state.fr.settings.dce && fullrep) {
+		while (pvc) {
+			data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
+				? LMI_CCITT_PVCSTAT : LMI_PVCSTAT;
+			data[i++] = stat_len;
+
+			if (hdlc->state.fr.reliable &&
+			    (pvc->netdev.flags & IFF_UP) &&
+			    !pvc->state.active &&
+			    !pvc->state.new) {
+				pvc->state.new = 1;
+				fr_log_dlci_active(pvc);
+			}
+
+			dlci_to_status(hdlc, netdev_dlci(&pvc->netdev),
+				       data + i,
+				       pvc->state.active, pvc->state.new);
+			i += stat_len;
+			pvc = pvc->next;
+		}
+	}
+
+	skb_put(skb, i);
+	skb->priority = TC_PRIO_CONTROL;
+	skb->dev = hdlc_to_dev(hdlc);
+
+	dev_queue_xmit(skb);
+}
+
+
+
+static void fr_timer(unsigned long arg)
+{
+	hdlc_device *hdlc = (hdlc_device*)arg;
+	int i, cnt = 0, reliable;
+	u32 list;
+
+	if (hdlc->state.fr.settings.dce)
+		reliable = (jiffies - hdlc->state.fr.last_poll <
+			    hdlc->state.fr.settings.t392 * HZ);
+	else {
+		hdlc->state.fr.last_errors <<= 1; /* Shift the list */
+		if (hdlc->state.fr.request) {
+			if (hdlc->state.fr.reliable)
+				printk(KERN_INFO "%s: No LMI status reply "
+				       "received\n", hdlc_to_name(hdlc));
+			hdlc->state.fr.last_errors |= 1;
+		}
+
+		list = hdlc->state.fr.last_errors;
+		for (i = 0; i < hdlc->state.fr.settings.n393; i++, list >>= 1)
+			cnt += (list & 1);	/* errors count */
+
+		reliable = (cnt < hdlc->state.fr.settings.n392);
+	}
+
+	if (hdlc->state.fr.reliable != reliable) {
+		pvc_device *pvc = hdlc->state.fr.first_pvc;
+
+		hdlc->state.fr.reliable = reliable;
+		printk(KERN_INFO "%s: Link %sreliable\n", hdlc_to_name(hdlc),
+		       reliable ? "" : "un");
+
+		if (reliable) {
+			hdlc->state.fr.n391cnt = 0; /* Request full status */
+			hdlc->state.fr.changed = 1;
+		} else {
+			while (pvc) {	/* Deactivate all PVCs */
+				pvc->state.new = pvc->state.active = 0;
+				pvc = pvc->next;
+			}
+		}
+	}
+
+	if (hdlc->state.fr.settings.dce)
+		hdlc->state.fr.timer.expires = jiffies +
+			hdlc->state.fr.settings.t392 * HZ;
+	else {
+		if (hdlc->state.fr.n391cnt)
+			hdlc->state.fr.n391cnt--;
+
+		fr_lmi_send(hdlc, hdlc->state.fr.n391cnt == 0);
+
+		hdlc->state.fr.request = 1;
+		hdlc->state.fr.timer.expires = jiffies +
+			hdlc->state.fr.settings.t391 * HZ;
+	}
+
+	hdlc->state.fr.timer.function = fr_timer;
+	hdlc->state.fr.timer.data = arg;
+	add_timer(&hdlc->state.fr.timer);
+}
+
+
+
+static int fr_lmi_recv(hdlc_device *hdlc, struct sk_buff *skb)
+{
+	int stat_len;
+	pvc_device *pvc;
+	int reptype = -1, error;
+	u8 rxseq, txseq;
+	int i;
+
+	if (skb->len < ((hdlc->state.fr.settings.lmi == LMI_ANSI)
+			? LMI_ANSI_LENGTH : LMI_LENGTH)) {
+		printk(KERN_INFO "%s: Short LMI frame\n", hdlc_to_name(hdlc));
+		return 1;
+	}
+
+	if (skb->data[5] != (!hdlc->state.fr.settings.dce ?
+			     LMI_STATUS : LMI_STATUS_ENQUIRY)) {
+		printk(KERN_INFO "%s: LMI msgtype=%x, Not LMI status %s\n",
+		       hdlc_to_name(hdlc), skb->data[2],
+		       hdlc->state.fr.settings.dce ? "enquiry" : "reply");
+		return 1;
+	}
+
+	i = (hdlc->state.fr.settings.lmi == LMI_ANSI) ? 7 : 6;
+
+	if (skb->data[i] !=
+	    ((hdlc->state.fr.settings.lmi == LMI_CCITT)
+	     ? LMI_CCITT_REPTYPE : LMI_REPTYPE)) {
+		printk(KERN_INFO "%s: Not a report type=%x\n",
+		       hdlc_to_name(hdlc), skb->data[i]);
+		return 1;
+	}
+	i++;
+
+	i++;				/* Skip length field */
+
+	reptype = skb->data[i++];
+
+	if (skb->data[i]!=
+	    ((hdlc->state.fr.settings.lmi == LMI_CCITT)
+	     ? LMI_CCITT_ALIVE : LMI_ALIVE)) {
+		printk(KERN_INFO "%s: Unsupported status element=%x\n",
+		       hdlc_to_name(hdlc), skb->data[i]);
+		return 1;
+	}
+	i++;
+
+	i++;			/* Skip length field */
+
+	hdlc->state.fr.rxseq = skb->data[i++]; /* TX sequence from peer */
+	rxseq = skb->data[i++];	/* Should confirm our sequence */
+
+	txseq = hdlc->state.fr.txseq;
+
+	if (hdlc->state.fr.settings.dce) {
+		if (reptype != LMI_FULLREP && reptype != LMI_INTEGRITY) {
+			printk(KERN_INFO "%s: Unsupported report type=%x\n",
+			       hdlc_to_name(hdlc), reptype);
+			return 1;
+		}
+	}
+
+	error = 0;
+	if (!hdlc->state.fr.reliable)
+		error = 1;
+
+	if (rxseq == 0 || rxseq != txseq) {
+		hdlc->state.fr.n391cnt = 0; /* Ask for full report next time */
+		error = 1;
+	}
+
+	if (hdlc->state.fr.settings.dce) {
+		if (hdlc->state.fr.fullrep_sent && !error) {
+/* Stop sending full report - the last one has been confirmed by DTE */
+			hdlc->state.fr.fullrep_sent = 0;
+			pvc = hdlc->state.fr.first_pvc;
+			while (pvc) {
+				if (pvc->state.new) {
+					pvc->state.new = 0;
+					pvc->state.active = 1;
+					fr_log_dlci_active(pvc);
+
+/* Tell DTE that new PVC is now active */
+					hdlc->state.fr.changed = 1;
+				}
+				pvc = pvc->next;
+			}
+		}
+
+		if (hdlc->state.fr.changed) {
+			reptype = LMI_FULLREP;
+			hdlc->state.fr.fullrep_sent = 1;
+			hdlc->state.fr.changed = 0;
+		}
+
+		fr_lmi_send(hdlc, reptype == LMI_FULLREP ? 1 : 0);
+		return 0;
+	}
+
+	/* DTE */
+
+	if (reptype != LMI_FULLREP || error)
+		return 0;
+
+	stat_len = 3;
+	pvc = hdlc->state.fr.first_pvc;
+
+	while (pvc) {
+		pvc->state.deleted = pvc->state.active; /* mark active PVCs */
+		pvc = pvc->next;
+	}
+
+	while (skb->len >= i + 2 + stat_len) {
+		u16 dlci;
+		int active, new;
+
+		if (skb->data[i] != ((hdlc->state.fr.settings.lmi == LMI_CCITT)
+				     ? LMI_CCITT_PVCSTAT : LMI_PVCSTAT)) {
+			printk(KERN_WARNING "%s: Invalid PVCSTAT ID: %x\n",
+			       hdlc_to_name(hdlc), skb->data[i]);
+			return 1;
+		}
+		i++;
+
+		if (skb->data[i] != stat_len) {
+			printk(KERN_WARNING "%s: Invalid PVCSTAT length: %x\n",
+			       hdlc_to_name(hdlc), skb->data[i]);
+			return 1;
+		}
+		i++;
+
+		dlci = status_to_dlci(hdlc, skb->data + i, &active, &new);
+		pvc = find_pvc(hdlc, dlci);
+
+		active |= new;
+		if (pvc) {
+			if (active && !pvc->state.active &&
+			    (pvc->netdev.flags & IFF_UP)) {
+				pvc->state.active = active;
+				fr_log_dlci_active(pvc);
+			}
+			pvc->state.deleted = 0;
+		}
+		else if (new)
+			printk(KERN_INFO "%s: new PVC available, DLCI=%u\n",
+			       hdlc_to_name(hdlc), dlci);
+
+		i += stat_len;
+	}
+
+	pvc = hdlc->state.fr.first_pvc;
+
+	while (pvc) {
+		if (pvc->state.deleted) {
+			pvc->state.active = pvc->state.new = 0;
+			fr_log_dlci_active(pvc);
+			pvc->state.deleted = 0;
+		}
+		pvc = pvc->next;
+	}
+
+	/* Next full report after N391 polls */
+	hdlc->state.fr.n391cnt = hdlc->state.fr.settings.n391;
+
+	return 0;
+}
+
+
+
+static void fr_rx(struct sk_buff *skb)
+{
+	hdlc_device *hdlc = dev_to_hdlc(skb->dev);
+	fr_hdr *fh = (fr_hdr*)skb->data;
+	u8 *data = skb->data;
+	u16 dlci;
+	pvc_device *pvc;
+
+	if (skb->len<4 || fh->ea1 || data[2] != FR_UI)
+		goto rx_error;
+
+	dlci = q922_to_dlci(skb->data);
+
+	if (dlci == LMI_DLCI) {
+		if (hdlc->state.fr.settings.lmi == LMI_NONE)
+			goto rx_error; /* LMI packet with no LMI? */
+
+		if (data[3] == LMI_PROTO) {
+			if (fr_lmi_recv(hdlc, skb))
+				goto rx_error;
+			else {
+				/* No request pending */
+				hdlc->state.fr.request = 0;
+				hdlc->state.fr.last_poll = jiffies;
+				dev_kfree_skb_any(skb);
+				return;
+			}
+		}
+
+		printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
+		       hdlc_to_name(hdlc));
+		goto rx_error;
+	}
+
+	pvc = find_pvc(hdlc, dlci);
+	if (!pvc) {
+#ifdef CONFIG_HDLC_DEBUG_PKT
+		printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
+		       hdlc_to_name(hdlc), dlci);
+#endif
+		goto rx_error;
+	}
+
+	if ((pvc->netdev.flags & IFF_UP) == 0) {
+#ifdef CONFIG_HDLC_DEBUG_PKT
+		printk(KERN_INFO "%s: PVC for received frame's DLCI %d is down\n",
+		       hdlc_to_name(hdlc), dlci);
+#endif
+		goto rx_error;
+	}
+
+	pvc->stats.rx_packets++; /* PVC traffic */
+	pvc->stats.rx_bytes += skb->len;
+
+	if (pvc->state.fecn != (fh->fecn ? PVC_STATE_FECN : 0)) {
+#ifdef CONFIG_HDLC_DEBUG_ECN
+		printk(KERN_DEBUG "%s: FECN O%s\n", pvc_to_name(pvc),
+		       fh->fecn ? "N" : "FF");
+#endif
+		pvc->state.fecn ^= 1;
+	}
+
+	if (pvc->state.becn != (fh->becn ? PVC_STATE_BECN : 0)) {
+#ifdef CONFIG_HDLC_DEBUG_ECN
+		printk(KERN_DEBUG "%s: BECN O%s\n", pvc_to_name(pvc),
+		       fh->becn ? "N" : "FF");
+#endif
+		pvc->state.becn ^= 1;
+	}
+
+	if (pvc->state.becn)
+		pvc->stats.rx_compressed++;
+
+	skb->dev = &pvc->netdev;
+
+	if (data[3] == NLPID_IP) {
+		skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
+		skb->protocol = htons(ETH_P_IP);
+		netif_rx(skb);
+		return;
+	}
+
+
+	if (data[3] == NLPID_IPV6) {
+		skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
+		skb->protocol = htons(ETH_P_IPV6);
+		netif_rx(skb);
+		return;
+	}
+
+	if (data[3] == FR_PAD && data[4] == NLPID_SNAP && data[5] == FR_PAD) {
+		u16 oui = ntohs(*(u16*)(data + 6));
+		u16 pid = ntohs(*(u16*)(data + 8));
+		skb_pull(skb, 10);
+
+		switch ((((u32)oui) << 16) | pid) {
+		case ETH_P_ARP: /* routed frame with SNAP */
+		case ETH_P_IPX:
+		case ETH_P_IP:	/* a long variant */
+		case ETH_P_IPV6:
+			skb->protocol = htons(pid);
+			break;
+
+		default:
+			printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
+			       "PID=%x\n", hdlc_to_name(hdlc), oui, pid);
+			dev_kfree_skb_any(skb);
+			return;
+		}
+
+		netif_rx(skb);
+		return;
+	}
+
+	printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x\n",
+	       hdlc_to_name(hdlc), data[3]);
+	dev_kfree_skb_any(skb);
+	return;
+
+ rx_error:
+	hdlc->stats.rx_errors++; /* Mark error */
+	dev_kfree_skb_any(skb);
+}
+
+
+
+static int fr_open(hdlc_device *hdlc)
+{
+	if (hdlc->state.fr.settings.lmi != LMI_NONE) {
+		hdlc->state.fr.last_poll = 0;
+		hdlc->state.fr.reliable = 0;
+		hdlc->state.fr.changed = 1;
+		hdlc->state.fr.request = 0;
+		hdlc->state.fr.fullrep_sent = 0;
+		hdlc->state.fr.last_errors = 0xFFFFFFFF;
+		hdlc->state.fr.n391cnt = 0;
+		hdlc->state.fr.txseq = hdlc->state.fr.rxseq = 0;
+
+		init_timer(&hdlc->state.fr.timer);
+		/* First poll after 1 s */
+		hdlc->state.fr.timer.expires = jiffies + HZ;
+		hdlc->state.fr.timer.function = fr_timer;
+		hdlc->state.fr.timer.data = (unsigned long)hdlc;
+		add_timer(&hdlc->state.fr.timer);
+	} else
+		hdlc->state.fr.reliable = 1;
+
+	return 0;
+}
+
+
+
+static void fr_close(hdlc_device *hdlc)
+{
+	pvc_device *pvc = hdlc->state.fr.first_pvc;
+
+	if (hdlc->state.fr.settings.lmi != LMI_NONE)
+		del_timer_sync(&hdlc->state.fr.timer);
+
+	while(pvc) {
+		dev_close(&pvc->netdev); /* Shutdown all PVCs for this FRAD */
+		pvc = pvc->next;
+	}
+}
+
+
+
+static int fr_pvc(hdlc_device *hdlc, unsigned int dlci, int create)
+{
+	pvc_device **pvc_p = &hdlc->state.fr.first_pvc;
+	pvc_device *pvc;
+	int result;
+
+	if(dlci <= 0 || dlci >= 1024)
+		return -EINVAL;	/* Only 10 bits for DLCI, DLCI 0 reserved */
+
+	while(*pvc_p) {
+		if (netdev_dlci(&(*pvc_p)->netdev) == dlci)
+			break;
+		pvc_p = &(*pvc_p)->next;
+	}
+
+	if (create) {		/* Create PVC */
+		if (*pvc_p != NULL)
+			return -EEXIST;
+
+		pvc = *pvc_p = kmalloc(sizeof(pvc_device), GFP_KERNEL);
+		if (!pvc) {
+			printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
+			       hdlc_to_name(hdlc));
+			return -ENOBUFS;
+		}
+		memset(pvc, 0, sizeof(pvc_device));
+
+		pvc->netdev.hard_start_xmit = pvc_xmit;
+		pvc->netdev.get_stats = pvc_get_stats;
+		pvc->netdev.open = pvc_open;
+		pvc->netdev.stop = pvc_close;
+		pvc->netdev.change_mtu = pvc_change_mtu;
+		pvc->netdev.mtu = HDLC_MAX_MTU;
+
+		pvc->netdev.type = ARPHRD_DLCI;
+		pvc->netdev.hard_header_len = 16;
+		pvc->netdev.hard_header = fr_hard_header;
+		pvc->netdev.tx_queue_len = 0;
+		pvc->netdev.flags = IFF_POINTOPOINT;
+
+		pvc->master = hdlc;
+		*(u16*)pvc->netdev.dev_addr = htons(dlci);
+		dlci_to_q922(pvc->netdev.broadcast, dlci);
+		pvc->netdev.addr_len = 2;
+
+		result = dev_alloc_name(&pvc->netdev, "pvc%d");
+		if (result < 0) {
+			kfree(pvc);
+			*pvc_p = NULL;
+			return result;
+		}
+
+		if (register_netdevice(&pvc->netdev) != 0) {
+			kfree(pvc);
+			*pvc_p = NULL;
+			return -EIO;
+		}
+
+		hdlc->state.fr.changed = 1;
+		hdlc->state.fr.pvc_count++;
+		return 0;
+	}
+
+	if (*pvc_p == NULL)		/* Delete PVC */
+		return -ENOENT;
+
+	pvc = *pvc_p;
+
+	if (pvc->netdev.flags & IFF_UP)
+		return -EBUSY;		/* PVC in use */
+
+	hdlc->state.fr.changed = 1;
+	hdlc->state.fr.pvc_count--;
+	*pvc_p = pvc->next;
+	unregister_netdevice(&pvc->netdev);
+	kfree(pvc);
+	return 0;
+}
+
+
+
+static void fr_destroy(hdlc_device *hdlc)
+{
+	pvc_device *pvc = hdlc->state.fr.first_pvc;
+	while(pvc) {
+		pvc_device *next = pvc->next;
+		unregister_netdev(&pvc->netdev);
+		kfree(pvc);
+		pvc = next;
+	}
+
+	hdlc->state.fr.first_pvc = NULL; /* All PVCs destroyed */
+	hdlc->state.fr.pvc_count = 0;
+	hdlc->state.fr.changed = 1;
+}
+
+
+
+int hdlc_fr_ioctl(hdlc_device *hdlc, struct ifreq *ifr)
+{
+	fr_proto *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
+	const size_t size = sizeof(fr_proto);
+	fr_proto new_settings;
+	struct net_device *dev = hdlc_to_dev(hdlc);
+	fr_proto_pvc pvc;
+	int result;
+
+	switch (ifr->ifr_settings.type) {
+	case IF_GET_PROTO:
+		ifr->ifr_settings.type = IF_PROTO_FR;
+		if (ifr->ifr_settings.size < size) {
+			ifr->ifr_settings.size = size; /* data size wanted */
+			return -ENOBUFS;
+		}
+		if (copy_to_user(fr_s, &hdlc->state.fr.settings, size))
+			return -EFAULT;
+		return 0;
+
+	case IF_PROTO_FR:
+		if(!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if(dev->flags & IFF_UP)
+			return -EBUSY;
+
+		if (copy_from_user(&new_settings, fr_s, size))
+			return -EFAULT;
+
+		if (new_settings.lmi == LMI_DEFAULT)
+			new_settings.lmi = LMI_ANSI;
+
+		if ((new_settings.lmi != LMI_NONE &&
+		     new_settings.lmi != LMI_ANSI &&
+		     new_settings.lmi != LMI_CCITT) ||
+		    new_settings.t391 < 1 ||
+		    new_settings.t392 < 2 ||
+		    new_settings.n391 < 1 ||
+		    new_settings.n392 < 1 ||
+		    new_settings.n393 < new_settings.n392 ||
+		    new_settings.n393 > 32 ||
+		    (new_settings.dce != 0 &&
+		     new_settings.dce != 1))
+			return -EINVAL;
+
+		result=hdlc->attach(hdlc, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
+		if (result)
+			return result;
+
+		if (hdlc->proto != IF_PROTO_FR) {
+			hdlc_proto_detach(hdlc);
+			hdlc->state.fr.first_pvc = NULL;
+			hdlc->state.fr.pvc_count = 0;
+		}
+		memcpy(&hdlc->state.fr.settings, &new_settings, size);
+
+		hdlc->open = fr_open;
+		hdlc->stop = fr_close;
+		hdlc->netif_rx = fr_rx;
+		hdlc->proto_detach = fr_destroy;
+		hdlc->proto = IF_PROTO_FR;
+		dev->hard_start_xmit = hdlc->xmit;
+		dev->hard_header = fr_hard_header;
+		dev->type = ARPHRD_FRAD;
+		dev->addr_len = 2;
+		*(u16*)dev->dev_addr = htons(LMI_DLCI);
+		dlci_to_q922(dev->broadcast, LMI_DLCI);
+		return 0;
+
+	case IF_PROTO_FR_ADD_PVC:
+	case IF_PROTO_FR_DEL_PVC:
+		if(!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
+				   sizeof(fr_proto_pvc)))
+			return -EFAULT;
+
+		return fr_pvc(hdlc, pvc.dlci,
+			      ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC);
+	}
+
+	return -EINVAL;
+}