Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1237 insertions, 0 deletions

diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c
new file mode 100644
index 00000000000..7f450b51a6c
--- /dev/null
+++ b/drivers/net/wan/hdlc_fr.c
@@ -0,0 +1,1237 @@
+/*
+ * Generic HDLC support routines for Linux
+ * Frame Relay support
+ *
+ * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+
+            Theory of PVC state
+
+ DCE mode:
+
+ (exist,new) -> 0,0 when "PVC create" or if "link unreliable"
+         0,x -> 1,1 if "link reliable" when sending FULL STATUS
+         1,1 -> 1,0 if received FULL STATUS ACK
+
+ (active)    -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
+             -> 1 when "PVC up" and (exist,new) = 1,0
+
+ DTE mode:
+ (exist,new,active) = FULL STATUS if "link reliable"
+		    = 0, 0, 0 if "link unreliable"
+ No LMI:
+ active = open and "link reliable"
+ exist = new = not used
+
+*/
+
+#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/random.h>
+#include <linux/inetdevice.h>
+#include <linux/lapb.h>
+#include <linux/rtnetlink.h>
+#include <linux/etherdevice.h>
+#include <linux/hdlc.h>
+
+#undef DEBUG_PKT
+#undef DEBUG_ECN
+#undef DEBUG_LINK
+
+#define MAXLEN_LMISTAT  20	/* max size of status enquiry frame */
+
+#define PVC_STATE_NEW	 0x01
+#define PVC_STATE_ACTIVE 0x02
+#define PVC_STATE_FECN	 0x08 /* FECN condition */
+#define PVC_STATE_BECN	 0x10 /* BECN condition */
+
+
+#define FR_UI		 0x03
+#define FR_PAD		 0x00
+
+#define NLPID_IP	 0xCC
+#define NLPID_IPV6	 0x8E
+#define NLPID_SNAP	 0x80
+#define NLPID_PAD	 0x00
+#define NLPID_Q933	 0x08
+
+
+#define LMI_DLCI                   0 /* LMI DLCI */
+#define LMI_PROTO               0x08
+#define LMI_CALLREF             0x00 /* Call Reference */
+#define LMI_ANSI_LOCKSHIFT      0x95 /* ANSI lockshift */
+#define LMI_REPTYPE                1 /* report type */
+#define LMI_CCITT_REPTYPE       0x51
+#define LMI_ALIVE                  3 /* keep alive */
+#define LMI_CCITT_ALIVE         0x53
+#define LMI_PVCSTAT                7 /* pvc status */
+#define LMI_CCITT_PVCSTAT       0x57
+#define LMI_FULLREP                0 /* full report  */
+#define LMI_INTEGRITY              1 /* link integrity report */
+#define LMI_SINGLE                 2 /* single pvc report */
+#define LMI_STATUS_ENQUIRY      0x75
+#define LMI_STATUS              0x7D /* reply */
+
+#define LMI_REPT_LEN               1 /* report type element length */
+#define LMI_INTEG_LEN              2 /* link integrity element length */
+
+#define LMI_LENGTH                13 /* standard LMI frame length */
+#define LMI_ANSI_LENGTH           14
+
+
+typedef struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+	unsigned ea1:	1;
+	unsigned cr:	1;
+	unsigned dlcih:	6;
+  
+	unsigned ea2:	1;
+	unsigned de:	1;
+	unsigned becn:	1;
+	unsigned fecn:	1;
+	unsigned dlcil:	4;
+#else
+	unsigned dlcih:	6;
+	unsigned cr:	1;
+	unsigned ea1:	1;
+
+	unsigned dlcil:	4;
+	unsigned fecn:	1;
+	unsigned becn:	1;
+	unsigned de:	1;
+	unsigned ea2:	1;
+#endif
+}__attribute__ ((packed)) fr_hdr;
+
+
+static inline u16 q922_to_dlci(u8 *hdr)
+{
+	return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
+}
+
+
+
+static inline void dlci_to_q922(u8 *hdr, u16 dlci)
+{
+	hdr[0] = (dlci >> 2) & 0xFC;
+	hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
+}
+
+
+
+static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
+{
+	pvc_device *pvc = hdlc->state.fr.first_pvc;
+
+	while (pvc) {
+		if (pvc->dlci == dlci)
+			return pvc;
+		if (pvc->dlci > dlci)
+			return NULL; /* the listed is sorted */
+		pvc = pvc->next;
+	}
+
+	return NULL;
+}
+
+
+static inline pvc_device* add_pvc(struct net_device *dev, u16 dlci)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	pvc_device *pvc, **pvc_p = &hdlc->state.fr.first_pvc;
+
+	while (*pvc_p) {
+		if ((*pvc_p)->dlci == dlci)
+			return *pvc_p;
+		if ((*pvc_p)->dlci > dlci)
+			break;	/* the list is sorted */
+		pvc_p = &(*pvc_p)->next;
+	}
+
+	pvc = kmalloc(sizeof(pvc_device), GFP_ATOMIC);
+	if (!pvc)
+		return NULL;
+
+	memset(pvc, 0, sizeof(pvc_device));
+	pvc->dlci = dlci;
+	pvc->master = dev;
+	pvc->next = *pvc_p;	/* Put it in the chain */
+	*pvc_p = pvc;
+	return pvc;
+}
+
+
+static inline int pvc_is_used(pvc_device *pvc)
+{
+	return pvc->main != NULL || pvc->ether != NULL;
+}
+
+
+static inline void pvc_carrier(int on, pvc_device *pvc)
+{
+	if (on) {
+		if (pvc->main)
+			if (!netif_carrier_ok(pvc->main))
+				netif_carrier_on(pvc->main);
+		if (pvc->ether)
+			if (!netif_carrier_ok(pvc->ether))
+				netif_carrier_on(pvc->ether);
+	} else {
+		if (pvc->main)
+			if (netif_carrier_ok(pvc->main))
+				netif_carrier_off(pvc->main);
+		if (pvc->ether)
+			if (netif_carrier_ok(pvc->ether))
+				netif_carrier_off(pvc->ether);
+	}
+}
+
+
+static inline void delete_unused_pvcs(hdlc_device *hdlc)
+{
+	pvc_device **pvc_p = &hdlc->state.fr.first_pvc;
+
+	while (*pvc_p) {
+		if (!pvc_is_used(*pvc_p)) {
+			pvc_device *pvc = *pvc_p;
+			*pvc_p = pvc->next;
+			kfree(pvc);
+			continue;
+		}
+		pvc_p = &(*pvc_p)->next;
+	}
+}
+
+
+static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
+{
+	if (type == ARPHRD_ETHER)
+		return &pvc->ether;
+	else
+		return &pvc->main;
+}
+
+
+static inline u16 status_to_dlci(u8 *status, int *active, int *new)
+{
+	*new = (status[2] & 0x08) ? 1 : 0;
+	*active = (status[2] & 0x02) ? 1 : 0;
+
+	return ((status[0] & 0x3F) << 4) | ((status[1] & 0x78) >> 3);
+}
+
+
+static inline void dlci_to_status(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_p, u16 dlci)
+{
+	u16 head_len;
+	struct sk_buff *skb = *skb_p;
+
+	switch (skb->protocol) {
+	case __constant_ntohs(ETH_P_IP):
+		head_len = 4;
+		skb_push(skb, head_len);
+		skb->data[3] = NLPID_IP;
+		break;
+
+	case __constant_ntohs(ETH_P_IPV6):
+		head_len = 4;
+		skb_push(skb, head_len);
+		skb->data[3] = NLPID_IPV6;
+		break;
+
+	case __constant_ntohs(LMI_PROTO):
+		head_len = 4;
+		skb_push(skb, head_len);
+		skb->data[3] = LMI_PROTO;
+		break;
+
+	case __constant_ntohs(ETH_P_802_3):
+		head_len = 10;
+		if (skb_headroom(skb) < head_len) {
+			struct sk_buff *skb2 = skb_realloc_headroom(skb,
+								    head_len);
+			if (!skb2)
+				return -ENOBUFS;
+			dev_kfree_skb(skb);
+			skb = *skb_p = skb2;
+		}
+		skb_push(skb, head_len);
+		skb->data[3] = FR_PAD;
+		skb->data[4] = NLPID_SNAP;
+		skb->data[5] = FR_PAD;
+		skb->data[6] = 0x80;
+		skb->data[7] = 0xC2;
+		skb->data[8] = 0x00;
+		skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
+		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;
+		*(u16*)(skb->data + 8) = skb->protocol;
+	}
+
+	dlci_to_q922(skb->data, dlci);
+	skb->data[2] = FR_UI;
+	return 0;
+}
+
+
+
+static int pvc_open(struct net_device *dev)
+{
+	pvc_device *pvc = dev_to_pvc(dev);
+
+	if ((pvc->master->flags & IFF_UP) == 0)
+		return -EIO;  /* Master must be UP in order to activate PVC */
+
+	if (pvc->open_count++ == 0) {
+		hdlc_device *hdlc = dev_to_hdlc(pvc->master);
+		if (hdlc->state.fr.settings.lmi == LMI_NONE)
+			pvc->state.active = hdlc->carrier;
+
+		pvc_carrier(pvc->state.active, pvc);
+		hdlc->state.fr.dce_changed = 1;
+	}
+	return 0;
+}
+
+
+
+static int pvc_close(struct net_device *dev)
+{
+	pvc_device *pvc = dev_to_pvc(dev);
+
+	if (--pvc->open_count == 0) {
+		hdlc_device *hdlc = dev_to_hdlc(pvc->master);
+		if (hdlc->state.fr.settings.lmi == LMI_NONE)
+			pvc->state.active = 0;
+
+		if (hdlc->state.fr.settings.dce) {
+			hdlc->state.fr.dce_changed = 1;
+			pvc->state.active = 0;
+		}
+	}
+	return 0;
+}
+
+
+
+int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	pvc_device *pvc = dev_to_pvc(dev);
+	fr_proto_pvc_info info;
+
+	if (ifr->ifr_settings.type == IF_GET_PROTO) {
+		if (dev->type == ARPHRD_ETHER)
+			ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
+		else
+			ifr->ifr_settings.type = IF_PROTO_FR_PVC;
+
+		if (ifr->ifr_settings.size < sizeof(info)) {
+			/* data size wanted */
+			ifr->ifr_settings.size = sizeof(info);
+			return -ENOBUFS;
+		}
+
+		info.dlci = pvc->dlci;
+		memcpy(info.master, pvc->master->name, IFNAMSIZ);
+		if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
+				 &info, sizeof(info)))
+			return -EFAULT;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+
+static inline struct net_device_stats *pvc_get_stats(struct net_device *dev)
+{
+	return netdev_priv(dev);
+}
+
+
+
+static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	pvc_device *pvc = dev_to_pvc(dev);
+	struct net_device_stats *stats = pvc_get_stats(dev);
+
+	if (pvc->state.active) {
+		if (dev->type == ARPHRD_ETHER) {
+			int pad = ETH_ZLEN - skb->len;
+			if (pad > 0) { /* Pad the frame with zeros */
+				int len = skb->len;
+				if (skb_tailroom(skb) < pad)
+					if (pskb_expand_head(skb, 0, pad,
+							     GFP_ATOMIC)) {
+						stats->tx_dropped++;
+						dev_kfree_skb(skb);
+						return 0;
+					}
+				skb_put(skb, pad);
+				memset(skb->data + len, 0, pad);
+			}
+			skb->protocol = __constant_htons(ETH_P_802_3);
+		}
+		if (!fr_hard_header(&skb, pvc->dlci)) {
+			stats->tx_bytes += skb->len;
+			stats->tx_packets++;
+			if (pvc->state.fecn) /* TX Congestion counter */
+				stats->tx_compressed++;
+			skb->dev = pvc->master;
+			dev_queue_xmit(skb);
+			return 0;
+		}
+	}
+
+	stats->tx_dropped++;
+	dev_kfree_skb(skb);
+	return 0;
+}
+
+
+
+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: DLCI %d [%s%s%s]%s %s\n",
+	       pvc->master->name,
+	       pvc->dlci,
+	       pvc->main ? pvc->main->name : "",
+	       pvc->main && pvc->ether ? " " : "",
+	       pvc->ether ? pvc->ether->name : "",
+	       pvc->state.new ? " new" : "",
+	       !pvc->state.exist ? "deleted" :
+	       pvc->state.active ? "active" : "inactive");
+}
+
+
+
+static inline u8 fr_lmi_nextseq(u8 x)
+{
+	x++;
+	return x ? x : 1;
+}
+
+
+
+static void fr_lmi_send(struct net_device *dev, int fullrep)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	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.dce_pvc_count * (2 + stat_len);
+		if (len > HDLC_MAX_MRU) {
+			printk(KERN_WARNING "%s: Too many PVCs while sending "
+			       "LMI full report\n", dev->name);
+			return;
+		}
+	}
+
+	skb = dev_alloc_skb(len);
+	if (!skb) {
+		printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
+		       dev->name);
+		return;
+	}
+	memset(skb->data, 0, len);
+	skb_reserve(skb, 4);
+	skb->protocol = __constant_htons(LMI_PROTO);
+	fr_hard_header(&skb, LMI_DLCI);
+	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;
+
+			/* LMI start/restart */
+			if (hdlc->state.fr.reliable && !pvc->state.exist) {
+				pvc->state.exist = pvc->state.new = 1;
+				fr_log_dlci_active(pvc);
+			}
+
+			/* ifconfig PVC up */
+			if (pvc->open_count && !pvc->state.active &&
+			    pvc->state.exist && !pvc->state.new) {
+				pvc_carrier(1, pvc);
+				pvc->state.active = 1;
+				fr_log_dlci_active(pvc);
+			}
+
+			dlci_to_status(pvc->dlci, 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 = dev;
+	skb->nh.raw = skb->data;
+
+	dev_queue_xmit(skb);
+}
+
+
+
+static void fr_set_link_state(int reliable, struct net_device *dev)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	pvc_device *pvc = hdlc->state.fr.first_pvc;
+
+	hdlc->state.fr.reliable = reliable;
+	if (reliable) {
+		if (!netif_carrier_ok(dev))
+			netif_carrier_on(dev);
+
+		hdlc->state.fr.n391cnt = 0; /* Request full status */
+		hdlc->state.fr.dce_changed = 1;
+
+		if (hdlc->state.fr.settings.lmi == LMI_NONE) {
+			while (pvc) {	/* Activate all PVCs */
+				pvc_carrier(1, pvc);
+				pvc->state.exist = pvc->state.active = 1;
+				pvc->state.new = 0;
+				pvc = pvc->next;
+			}
+		}
+	} else {
+		if (netif_carrier_ok(dev))
+			netif_carrier_off(dev);
+
+		while (pvc) {		/* Deactivate all PVCs */
+			pvc_carrier(0, pvc);
+			pvc->state.exist = pvc->state.active = 0;
+			pvc->state.new = 0;
+			pvc = pvc->next;
+		}
+	}
+}
+
+
+
+static void fr_timer(unsigned long arg)
+{
+	struct net_device *dev = (struct net_device *)arg;
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	int i, cnt = 0, reliable;
+	u32 list;
+
+	if (hdlc->state.fr.settings.dce)
+		reliable = hdlc->state.fr.request &&
+			time_before(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", dev->name);
+			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) {
+		printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
+		       reliable ? "" : "un");
+		fr_set_link_state(reliable, dev);
+	}
+
+	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(dev, hdlc->state.fr.n391cnt == 0);
+
+		hdlc->state.fr.last_poll = jiffies;
+		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(struct net_device *dev, struct sk_buff *skb)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	int stat_len;
+	pvc_device *pvc;
+	int reptype = -1, error, no_ram;
+	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", dev->name);
+		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",
+		       dev->name, 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",
+		       dev->name, 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",
+		       dev->name, 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",
+			       dev->name, reptype);
+			return 1;
+		}
+		hdlc->state.fr.last_poll = jiffies;
+	}
+
+	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;
+
+/* Tell DTE that new PVC is now active */
+					hdlc->state.fr.dce_changed = 1;
+				}
+				pvc = pvc->next;
+			}
+		}
+
+		if (hdlc->state.fr.dce_changed) {
+			reptype = LMI_FULLREP;
+			hdlc->state.fr.fullrep_sent = 1;
+			hdlc->state.fr.dce_changed = 0;
+		}
+
+		fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
+		return 0;
+	}
+
+	/* DTE */
+
+	hdlc->state.fr.request = 0; /* got response, no request pending */
+
+	if (error)
+		return 0;
+
+	if (reptype != LMI_FULLREP)
+		return 0;
+
+	stat_len = 3;
+	pvc = hdlc->state.fr.first_pvc;
+
+	while (pvc) {
+		pvc->state.deleted = 1;
+		pvc = pvc->next;
+	}
+
+	no_ram = 0;
+	while (skb->len >= i + 2 + stat_len) {
+		u16 dlci;
+		unsigned 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",
+			       dev->name, skb->data[i]);
+			return 1;
+		}
+		i++;
+
+		if (skb->data[i] != stat_len) {
+			printk(KERN_WARNING "%s: Invalid PVCSTAT length: %x\n",
+			       dev->name, skb->data[i]);
+			return 1;
+		}
+		i++;
+
+		dlci = status_to_dlci(skb->data + i, &active, &new);
+
+		pvc = add_pvc(dev, dlci);
+
+		if (!pvc && !no_ram) {
+			printk(KERN_WARNING
+			       "%s: Memory squeeze on fr_lmi_recv()\n",
+			       dev->name);
+			no_ram = 1;
+		}
+
+		if (pvc) {
+			pvc->state.exist = 1;
+			pvc->state.deleted = 0;
+			if (active != pvc->state.active ||
+			    new != pvc->state.new ||
+			    !pvc->state.exist) {
+				pvc->state.new = new;
+				pvc->state.active = active;
+				pvc_carrier(active, pvc);
+				fr_log_dlci_active(pvc);
+			}
+		}
+
+		i += stat_len;
+	}
+
+	pvc = hdlc->state.fr.first_pvc;
+
+	while (pvc) {
+		if (pvc->state.deleted && pvc->state.exist) {
+			pvc_carrier(0, pvc);
+			pvc->state.active = pvc->state.new = 0;
+			pvc->state.exist = 0;
+			fr_log_dlci_active(pvc);
+		}
+		pvc = pvc->next;
+	}
+
+	/* Next full report after N391 polls */
+	hdlc->state.fr.n391cnt = hdlc->state.fr.settings.n391;
+
+	return 0;
+}
+
+
+
+static int fr_rx(struct sk_buff *skb)
+{
+	struct net_device *ndev = skb->dev;
+	hdlc_device *hdlc = dev_to_hdlc(ndev);
+	fr_hdr *fh = (fr_hdr*)skb->data;
+	u8 *data = skb->data;
+	u16 dlci;
+	pvc_device *pvc;
+	struct net_device *dev = NULL;
+
+	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(ndev, skb))
+				goto rx_error;
+			else {
+				dev_kfree_skb_any(skb);
+				return NET_RX_SUCCESS;
+			}
+		}
+
+		printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
+		       ndev->name);
+		goto rx_error;
+	}
+
+	pvc = find_pvc(hdlc, dlci);
+	if (!pvc) {
+#ifdef DEBUG_PKT
+		printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
+		       ndev->name, dlci);
+#endif
+		dev_kfree_skb_any(skb);
+		return NET_RX_DROP;
+	}
+
+	if (pvc->state.fecn != fh->fecn) {
+#ifdef DEBUG_ECN
+		printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", ndev->name,
+		       dlci, fh->fecn ? "N" : "FF");
+#endif
+		pvc->state.fecn ^= 1;
+	}
+
+	if (pvc->state.becn != fh->becn) {
+#ifdef DEBUG_ECN
+		printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", ndev->name,
+		       dlci, fh->becn ? "N" : "FF");
+#endif
+		pvc->state.becn ^= 1;
+	}
+
+
+	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
+		hdlc->stats.rx_dropped++;
+		return NET_RX_DROP;
+	}
+
+	if (data[3] == NLPID_IP) {
+		skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
+		dev = pvc->main;
+		skb->protocol = htons(ETH_P_IP);
+
+	} else if (data[3] == NLPID_IPV6) {
+		skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
+		dev = pvc->main;
+		skb->protocol = htons(ETH_P_IPV6);
+
+	} else if (skb->len > 10 && 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:
+			dev = pvc->main;
+			skb->protocol = htons(pid);
+			break;
+
+		case 0x80C20007: /* bridged Ethernet frame */
+			if ((dev = pvc->ether) != NULL)
+				skb->protocol = eth_type_trans(skb, dev);
+			break;
+
+		default:
+			printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
+			       "PID=%x\n", ndev->name, oui, pid);
+			dev_kfree_skb_any(skb);
+			return NET_RX_DROP;
+		}
+	} else {
+		printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
+		       "length = %i\n", ndev->name, data[3], skb->len);
+		dev_kfree_skb_any(skb);
+		return NET_RX_DROP;
+	}
+
+	if (dev) {
+		struct net_device_stats *stats = pvc_get_stats(dev);
+		stats->rx_packets++; /* PVC traffic */
+		stats->rx_bytes += skb->len;
+		if (pvc->state.becn)
+			stats->rx_compressed++;
+		skb->dev = dev;
+		netif_rx(skb);
+		return NET_RX_SUCCESS;
+	} else {
+		dev_kfree_skb_any(skb);
+		return NET_RX_DROP;
+	}
+
+ rx_error:
+	hdlc->stats.rx_errors++; /* Mark error */
+	dev_kfree_skb_any(skb);
+	return NET_RX_DROP;
+}
+
+
+
+static void fr_start(struct net_device *dev)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+#ifdef DEBUG_LINK
+	printk(KERN_DEBUG "fr_start\n");
+#endif
+	if (hdlc->state.fr.settings.lmi != LMI_NONE) {
+		hdlc->state.fr.reliable = 0;
+		hdlc->state.fr.dce_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)dev;
+		add_timer(&hdlc->state.fr.timer);
+	} else
+		fr_set_link_state(1, dev);
+}
+
+
+
+static void fr_stop(struct net_device *dev)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+#ifdef DEBUG_LINK
+	printk(KERN_DEBUG "fr_stop\n");
+#endif
+	if (hdlc->state.fr.settings.lmi != LMI_NONE)
+		del_timer_sync(&hdlc->state.fr.timer);
+	fr_set_link_state(0, dev);
+}
+
+
+
+static void fr_close(struct net_device *dev)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	pvc_device *pvc = hdlc->state.fr.first_pvc;
+
+	while (pvc) {		/* Shutdown all PVCs for this FRAD */
+		if (pvc->main)
+			dev_close(pvc->main);
+		if (pvc->ether)
+			dev_close(pvc->ether);
+		pvc = pvc->next;
+	}
+}
+
+static void dlci_setup(struct net_device *dev)
+{
+	dev->type = ARPHRD_DLCI;
+	dev->flags = IFF_POINTOPOINT;
+	dev->hard_header_len = 10;
+	dev->addr_len = 2;
+}
+
+static int fr_add_pvc(struct net_device *master, unsigned int dlci, int type)
+{
+	hdlc_device *hdlc = dev_to_hdlc(master);
+	pvc_device *pvc = NULL;
+	struct net_device *dev;
+	int result, used;
+	char * prefix = "pvc%d";
+
+	if (type == ARPHRD_ETHER)
+		prefix = "pvceth%d";
+
+	if ((pvc = add_pvc(master, dlci)) == NULL) {
+		printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
+		       master->name);
+		return -ENOBUFS;
+	}
+
+	if (*get_dev_p(pvc, type))
+		return -EEXIST;
+
+	used = pvc_is_used(pvc);
+
+	if (type == ARPHRD_ETHER)
+		dev = alloc_netdev(sizeof(struct net_device_stats),
+				   "pvceth%d", ether_setup);
+	else
+		dev = alloc_netdev(sizeof(struct net_device_stats),
+				   "pvc%d", dlci_setup);
+
+	if (!dev) {
+		printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
+		       master->name);
+		delete_unused_pvcs(hdlc);
+		return -ENOBUFS;
+	}
+
+	if (type == ARPHRD_ETHER) {
+		memcpy(dev->dev_addr, "\x00\x01", 2);
+                get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
+	} else {
+		*(u16*)dev->dev_addr = htons(dlci);
+		dlci_to_q922(dev->broadcast, dlci);
+	}
+	dev->hard_start_xmit = pvc_xmit;
+	dev->get_stats = pvc_get_stats;
+	dev->open = pvc_open;
+	dev->stop = pvc_close;
+	dev->do_ioctl = pvc_ioctl;
+	dev->change_mtu = pvc_change_mtu;
+	dev->mtu = HDLC_MAX_MTU;
+	dev->tx_queue_len = 0;
+	dev->priv = pvc;
+
+	result = dev_alloc_name(dev, dev->name);
+	if (result < 0) {
+		free_netdev(dev);
+		delete_unused_pvcs(hdlc);
+		return result;
+	}
+
+	if (register_netdevice(dev) != 0) {
+		free_netdev(dev);
+		delete_unused_pvcs(hdlc);
+		return -EIO;
+	}
+
+	dev->destructor = free_netdev;
+	*get_dev_p(pvc, type) = dev;
+	if (!used) {
+		hdlc->state.fr.dce_changed = 1;
+		hdlc->state.fr.dce_pvc_count++;
+	}
+	return 0;
+}
+
+
+
+static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
+{
+	pvc_device *pvc;
+	struct net_device *dev;
+
+	if ((pvc = find_pvc(hdlc, dlci)) == NULL)
+		return -ENOENT;
+
+	if ((dev = *get_dev_p(pvc, type)) == NULL)
+		return -ENOENT;
+
+	if (dev->flags & IFF_UP)
+		return -EBUSY;		/* PVC in use */
+
+	unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
+	*get_dev_p(pvc, type) = NULL;
+
+	if (!pvc_is_used(pvc)) {
+		hdlc->state.fr.dce_pvc_count--;
+		hdlc->state.fr.dce_changed = 1;
+	}
+	delete_unused_pvcs(hdlc);
+	return 0;
+}
+
+
+
+static void fr_destroy(hdlc_device *hdlc)
+{
+	pvc_device *pvc;
+
+	pvc = hdlc->state.fr.first_pvc;
+	hdlc->state.fr.first_pvc = NULL; /* All PVCs destroyed */
+	hdlc->state.fr.dce_pvc_count = 0;
+	hdlc->state.fr.dce_changed = 1;
+
+	while (pvc) {
+		pvc_device *next = pvc->next;
+		/* destructors will free_netdev() main and ether */
+		if (pvc->main)
+			unregister_netdevice(pvc->main);
+
+		if (pvc->ether)
+			unregister_netdevice(pvc->ether);
+
+		kfree(pvc);
+		pvc = next;
+	}
+}
+
+
+
+int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr)
+{
+	fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
+	const size_t size = sizeof(fr_proto);
+	fr_proto new_settings;
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	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(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
+		if (result)
+			return result;
+
+		if (hdlc->proto.id != IF_PROTO_FR) {
+			hdlc_proto_detach(hdlc);
+			hdlc->state.fr.first_pvc = NULL;
+			hdlc->state.fr.dce_pvc_count = 0;
+		}
+		memcpy(&hdlc->state.fr.settings, &new_settings, size);
+		memset(&hdlc->proto, 0, sizeof(hdlc->proto));
+
+		hdlc->proto.close = fr_close;
+		hdlc->proto.start = fr_start;
+		hdlc->proto.stop = fr_stop;
+		hdlc->proto.detach = fr_destroy;
+		hdlc->proto.netif_rx = fr_rx;
+		hdlc->proto.id = IF_PROTO_FR;
+		dev->hard_start_xmit = hdlc->xmit;
+		dev->hard_header = NULL;
+		dev->type = ARPHRD_FRAD;
+		dev->flags = IFF_POINTOPOINT | IFF_NOARP;
+		dev->addr_len = 0;
+		return 0;
+
+	case IF_PROTO_FR_ADD_PVC:
+	case IF_PROTO_FR_DEL_PVC:
+	case IF_PROTO_FR_ADD_ETH_PVC:
+	case IF_PROTO_FR_DEL_ETH_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;
+
+		if (pvc.dlci <= 0 || pvc.dlci >= 1024)
+			return -EINVAL;	/* Only 10 bits, DLCI 0 reserved */
+
+		if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
+		    ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
+			result = ARPHRD_ETHER; /* bridged Ethernet device */
+		else
+			result = ARPHRD_DLCI;
+
+		if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
+		    ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
+			return fr_add_pvc(dev, pvc.dlci, result);
+		else
+			return fr_del_pvc(hdlc, pvc.dlci, result);
+	}
+
+	return -EINVAL;
+}