Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1300 insertions, 0 deletions

diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c
new file mode 100644
index 000000000..81e72bc18
--- /dev/null
+++ b/drivers/net/wan/hdlc_fr.c
@@ -0,0 +1,1300 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generic HDLC support routines for Linux
+ * Frame Relay support
+ *
+ * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+
+	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
+
+ CCITT LMI: ITU-T Q.933 Annex A
+ ANSI LMI: ANSI T1.617 Annex D
+ CISCO LMI: the original, aka "Gang of Four" LMI
+
+*/
+
+#include <linux/errno.h>
+#include <linux/etherdevice.h>
+#include <linux/hdlc.h>
+#include <linux/if_arp.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pkt_sched.h>
+#include <linux/poll.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+
+#undef DEBUG_PKT
+#undef DEBUG_ECN
+#undef DEBUG_LINK
+#undef DEBUG_PROTO
+#undef DEBUG_PVC
+
+#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_CCITT_ANSI_LMI	0x08
+#define NLPID_CISCO_LMI		0x09
+
+#define LMI_CCITT_ANSI_DLCI	   0 /* LMI DLCI */
+#define LMI_CISCO_DLCI		1023
+
+#define LMI_CALLREF		0x00 /* Call Reference */
+#define LMI_ANSI_LOCKSHIFT	0x95 /* ANSI locking shift */
+#define LMI_ANSI_CISCO_REPTYPE	0x01 /* report type */
+#define LMI_CCITT_REPTYPE	0x51
+#define LMI_ANSI_CISCO_ALIVE	0x03 /* keep alive */
+#define LMI_CCITT_ALIVE		0x53
+#define LMI_ANSI_CISCO_PVCSTAT	0x07 /* PVC status */
+#define LMI_CCITT_PVCSTAT	0x57
+
+#define LMI_FULLREP		0x00 /* full report  */
+#define LMI_INTEGRITY		0x01 /* link integrity report */
+#define LMI_SINGLE		0x02 /* 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_CCITT_CISCO_LENGTH	  13 /* LMI frame lengths */
+#define LMI_ANSI_LENGTH		  14
+
+struct fr_hdr {
+#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
+} __packed;
+
+struct pvc_device {
+	struct net_device *frad;
+	struct net_device *main;
+	struct net_device *ether;	/* bridged Ethernet interface	*/
+	struct pvc_device *next;	/* Sorted in ascending DLCI order */
+	int dlci;
+	int open_count;
+
+	struct {
+		unsigned int new: 1;
+		unsigned int active: 1;
+		unsigned int exist: 1;
+		unsigned int deleted: 1;
+		unsigned int fecn: 1;
+		unsigned int becn: 1;
+		unsigned int bandwidth;	/* Cisco LMI reporting only */
+	} state;
+};
+
+struct frad_state {
+	fr_proto settings;
+	struct pvc_device *first_pvc;
+	int dce_pvc_count;
+
+	struct timer_list timer;
+	struct net_device *dev;
+	unsigned long last_poll;
+	int reliable;
+	int dce_changed;
+	int request;
+	int fullrep_sent;
+	u32 last_errors; /* last errors bit list */
+	u8 n391cnt;
+	u8 txseq; /* TX sequence number */
+	u8 rxseq; /* RX sequence number */
+};
+
+static int fr_ioctl(struct net_device *dev, struct if_settings *ifs);
+
+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 struct frad_state *state(hdlc_device *hdlc)
+{
+	return (struct frad_state *)(hdlc->state);
+}
+
+static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
+{
+	struct pvc_device *pvc = state(hdlc)->first_pvc;
+
+	while (pvc) {
+		if (pvc->dlci == dlci)
+			return pvc;
+		if (pvc->dlci > dlci)
+			return NULL; /* the list is sorted */
+		pvc = pvc->next;
+	}
+
+	return NULL;
+}
+
+static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	struct pvc_device *pvc, **pvc_p = &state(hdlc)->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 = kzalloc(sizeof(*pvc), GFP_ATOMIC);
+#ifdef DEBUG_PVC
+	printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
+#endif
+	if (!pvc)
+		return NULL;
+
+	pvc->dlci = dlci;
+	pvc->frad = dev;
+	pvc->next = *pvc_p;	/* Put it in the chain */
+	*pvc_p = pvc;
+	return pvc;
+}
+
+static inline int pvc_is_used(struct pvc_device *pvc)
+{
+	return pvc->main || pvc->ether;
+}
+
+static inline void pvc_carrier(int on, struct 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)
+{
+	struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
+
+	while (*pvc_p) {
+		if (!pvc_is_used(*pvc_p)) {
+			struct pvc_device *pvc = *pvc_p;
+#ifdef DEBUG_PVC
+			printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
+#endif
+			*pvc_p = pvc->next;
+			kfree(pvc);
+			continue;
+		}
+		pvc_p = &(*pvc_p)->next;
+	}
+}
+
+static inline struct net_device **get_dev_p(struct pvc_device *pvc,
+					    int type)
+{
+	if (type == ARPHRD_ETHER)
+		return &pvc->ether;
+	else
+		return &pvc->main;
+}
+
+static int fr_hard_header(struct sk_buff *skb, u16 dlci)
+{
+	if (!skb->dev) { /* Control packets */
+		switch (dlci) {
+		case LMI_CCITT_ANSI_DLCI:
+			skb_push(skb, 4);
+			skb->data[3] = NLPID_CCITT_ANSI_LMI;
+			break;
+
+		case LMI_CISCO_DLCI:
+			skb_push(skb, 4);
+			skb->data[3] = NLPID_CISCO_LMI;
+			break;
+
+		default:
+			return -EINVAL;
+		}
+
+	} else if (skb->dev->type == ARPHRD_DLCI) {
+		switch (skb->protocol) {
+		case htons(ETH_P_IP):
+			skb_push(skb, 4);
+			skb->data[3] = NLPID_IP;
+			break;
+
+		case htons(ETH_P_IPV6):
+			skb_push(skb, 4);
+			skb->data[3] = NLPID_IPV6;
+			break;
+
+		default:
+			skb_push(skb, 10);
+			skb->data[3] = FR_PAD;
+			skb->data[4] = NLPID_SNAP;
+			/* OUI 00-00-00 indicates an Ethertype follows */
+			skb->data[5] = 0x00;
+			skb->data[6] = 0x00;
+			skb->data[7] = 0x00;
+			/* This should be an Ethertype: */
+			*(__be16 *)(skb->data + 8) = skb->protocol;
+		}
+
+	} else if (skb->dev->type == ARPHRD_ETHER) {
+		skb_push(skb, 10);
+		skb->data[3] = FR_PAD;
+		skb->data[4] = NLPID_SNAP;
+		/* OUI 00-80-C2 stands for the 802.1 organization */
+		skb->data[5] = 0x00;
+		skb->data[6] = 0x80;
+		skb->data[7] = 0xC2;
+		/* PID 00-07 stands for Ethernet frames without FCS */
+		skb->data[8] = 0x00;
+		skb->data[9] = 0x07;
+
+	} else {
+		return -EINVAL;
+	}
+
+	dlci_to_q922(skb->data, dlci);
+	skb->data[2] = FR_UI;
+	return 0;
+}
+
+static int pvc_open(struct net_device *dev)
+{
+	struct pvc_device *pvc = dev->ml_priv;
+
+	if ((pvc->frad->flags & IFF_UP) == 0)
+		return -EIO;  /* Frad must be UP in order to activate PVC */
+
+	if (pvc->open_count++ == 0) {
+		hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
+
+		if (state(hdlc)->settings.lmi == LMI_NONE)
+			pvc->state.active = netif_carrier_ok(pvc->frad);
+
+		pvc_carrier(pvc->state.active, pvc);
+		state(hdlc)->dce_changed = 1;
+	}
+	return 0;
+}
+
+static int pvc_close(struct net_device *dev)
+{
+	struct pvc_device *pvc = dev->ml_priv;
+
+	if (--pvc->open_count == 0) {
+		hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
+
+		if (state(hdlc)->settings.lmi == LMI_NONE)
+			pvc->state.active = 0;
+
+		if (state(hdlc)->settings.dce) {
+			state(hdlc)->dce_changed = 1;
+			pvc->state.active = 0;
+		}
+	}
+	return 0;
+}
+
+static int pvc_ioctl(struct net_device *dev, struct if_settings *ifs)
+{
+	struct pvc_device *pvc = dev->ml_priv;
+	fr_proto_pvc_info info;
+
+	if (ifs->type == IF_GET_PROTO) {
+		if (dev->type == ARPHRD_ETHER)
+			ifs->type = IF_PROTO_FR_ETH_PVC;
+		else
+			ifs->type = IF_PROTO_FR_PVC;
+
+		if (ifs->size < sizeof(info)) {
+			/* data size wanted */
+			ifs->size = sizeof(info);
+			return -ENOBUFS;
+		}
+
+		info.dlci = pvc->dlci;
+		memcpy(info.master, pvc->frad->name, IFNAMSIZ);
+		if (copy_to_user(ifs->ifs_ifsu.fr_pvc_info,
+				 &info, sizeof(info)))
+			return -EFAULT;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct pvc_device *pvc = dev->ml_priv;
+
+	if (!pvc->state.active)
+		goto drop;
+
+	if (dev->type == ARPHRD_ETHER) {
+		int pad = ETH_ZLEN - skb->len;
+
+		if (pad > 0) { /* Pad the frame with zeros */
+			if (__skb_pad(skb, pad, false))
+				goto drop;
+			skb_put(skb, pad);
+		}
+	}
+
+	/* We already requested the header space with dev->needed_headroom.
+	 * So this is just a protection in case the upper layer didn't take
+	 * dev->needed_headroom into consideration.
+	 */
+	if (skb_headroom(skb) < 10) {
+		struct sk_buff *skb2 = skb_realloc_headroom(skb, 10);
+
+		if (!skb2)
+			goto drop;
+		dev_kfree_skb(skb);
+		skb = skb2;
+	}
+
+	skb->dev = dev;
+	if (fr_hard_header(skb, pvc->dlci))
+		goto drop;
+
+	dev->stats.tx_bytes += skb->len;
+	dev->stats.tx_packets++;
+	if (pvc->state.fecn) /* TX Congestion counter */
+		dev->stats.tx_compressed++;
+	skb->dev = pvc->frad;
+	skb->protocol = htons(ETH_P_HDLC);
+	skb_reset_network_header(skb);
+	dev_queue_xmit(skb);
+	return NETDEV_TX_OK;
+
+drop:
+	dev->stats.tx_dropped++;
+	kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+static inline void fr_log_dlci_active(struct pvc_device *pvc)
+{
+	netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
+		    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;
+	struct pvc_device *pvc = state(hdlc)->first_pvc;
+	int lmi = state(hdlc)->settings.lmi;
+	int dce = state(hdlc)->settings.dce;
+	int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
+	int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
+	u8 *data;
+	int i = 0;
+
+	if (dce && fullrep) {
+		len += state(hdlc)->dce_pvc_count * (2 + stat_len);
+		if (len > HDLC_MAX_MRU) {
+			netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
+			return;
+		}
+	}
+
+	skb = dev_alloc_skb(len);
+	if (!skb)
+		return;
+
+	memset(skb->data, 0, len);
+	skb_reserve(skb, 4);
+	if (lmi == LMI_CISCO)
+		fr_hard_header(skb, LMI_CISCO_DLCI);
+	else
+		fr_hard_header(skb, LMI_CCITT_ANSI_DLCI);
+
+	data = skb_tail_pointer(skb);
+	data[i++] = LMI_CALLREF;
+	data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
+	if (lmi == LMI_ANSI)
+		data[i++] = LMI_ANSI_LOCKSHIFT;
+	data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
+		LMI_ANSI_CISCO_REPTYPE;
+	data[i++] = LMI_REPT_LEN;
+	data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
+	data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
+	data[i++] = LMI_INTEG_LEN;
+	data[i++] = state(hdlc)->txseq =
+		fr_lmi_nextseq(state(hdlc)->txseq);
+	data[i++] = state(hdlc)->rxseq;
+
+	if (dce && fullrep) {
+		while (pvc) {
+			data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
+				LMI_ANSI_CISCO_PVCSTAT;
+			data[i++] = stat_len;
+
+			/* LMI start/restart */
+			if (state(hdlc)->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);
+			}
+
+			if (lmi == LMI_CISCO) {
+				data[i] = pvc->dlci >> 8;
+				data[i + 1] = pvc->dlci & 0xFF;
+			} else {
+				data[i] = (pvc->dlci >> 4) & 0x3F;
+				data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
+				data[i + 2] = 0x80;
+			}
+
+			if (pvc->state.new)
+				data[i + 2] |= 0x08;
+			else if (pvc->state.active)
+				data[i + 2] |= 0x02;
+
+			i += stat_len;
+			pvc = pvc->next;
+		}
+	}
+
+	skb_put(skb, i);
+	skb->priority = TC_PRIO_CONTROL;
+	skb->dev = dev;
+	skb->protocol = htons(ETH_P_HDLC);
+	skb_reset_network_header(skb);
+
+	dev_queue_xmit(skb);
+}
+
+static void fr_set_link_state(int reliable, struct net_device *dev)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	struct pvc_device *pvc = state(hdlc)->first_pvc;
+
+	state(hdlc)->reliable = reliable;
+	if (reliable) {
+		netif_dormant_off(dev);
+		state(hdlc)->n391cnt = 0; /* Request full status */
+		state(hdlc)->dce_changed = 1;
+
+		if (state(hdlc)->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 {
+		netif_dormant_on(dev);
+		while (pvc) {		/* Deactivate all PVCs */
+			pvc_carrier(0, pvc);
+			pvc->state.exist = pvc->state.active = 0;
+			pvc->state.new = 0;
+			if (!state(hdlc)->settings.dce)
+				pvc->state.bandwidth = 0;
+			pvc = pvc->next;
+		}
+	}
+}
+
+static void fr_timer(struct timer_list *t)
+{
+	struct frad_state *st = from_timer(st, t, timer);
+	struct net_device *dev = st->dev;
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	int i, cnt = 0, reliable;
+	u32 list;
+
+	if (state(hdlc)->settings.dce) {
+		reliable = state(hdlc)->request &&
+			time_before(jiffies, state(hdlc)->last_poll +
+				    state(hdlc)->settings.t392 * HZ);
+		state(hdlc)->request = 0;
+	} else {
+		state(hdlc)->last_errors <<= 1; /* Shift the list */
+		if (state(hdlc)->request) {
+			if (state(hdlc)->reliable)
+				netdev_info(dev, "No LMI status reply received\n");
+			state(hdlc)->last_errors |= 1;
+		}
+
+		list = state(hdlc)->last_errors;
+		for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
+			cnt += (list & 1);	/* errors count */
+
+		reliable = (cnt < state(hdlc)->settings.n392);
+	}
+
+	if (state(hdlc)->reliable != reliable) {
+		netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
+		fr_set_link_state(reliable, dev);
+	}
+
+	if (state(hdlc)->settings.dce) {
+		state(hdlc)->timer.expires = jiffies +
+			state(hdlc)->settings.t392 * HZ;
+	} else {
+		if (state(hdlc)->n391cnt)
+			state(hdlc)->n391cnt--;
+
+		fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
+
+		state(hdlc)->last_poll = jiffies;
+		state(hdlc)->request = 1;
+		state(hdlc)->timer.expires = jiffies +
+			state(hdlc)->settings.t391 * HZ;
+	}
+
+	add_timer(&state(hdlc)->timer);
+}
+
+static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	struct pvc_device *pvc;
+	u8 rxseq, txseq;
+	int lmi = state(hdlc)->settings.lmi;
+	int dce = state(hdlc)->settings.dce;
+	int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
+
+	if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
+			LMI_CCITT_CISCO_LENGTH)) {
+		netdev_info(dev, "Short LMI frame\n");
+		return 1;
+	}
+
+	if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
+			     NLPID_CCITT_ANSI_LMI)) {
+		netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
+		return 1;
+	}
+
+	if (skb->data[4] != LMI_CALLREF) {
+		netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
+			    skb->data[4]);
+		return 1;
+	}
+
+	if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
+		netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
+			    skb->data[5]);
+		return 1;
+	}
+
+	if (lmi == LMI_ANSI) {
+		if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
+			netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
+				    skb->data[6]);
+			return 1;
+		}
+		i = 7;
+	} else {
+		i = 6;
+	}
+
+	if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
+			     LMI_ANSI_CISCO_REPTYPE)) {
+		netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
+			    skb->data[i]);
+		return 1;
+	}
+
+	if (skb->data[++i] != LMI_REPT_LEN) {
+		netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
+			    skb->data[i]);
+		return 1;
+	}
+
+	reptype = skb->data[++i];
+	if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
+		netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
+			    reptype);
+		return 1;
+	}
+
+	if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
+			       LMI_ANSI_CISCO_ALIVE)) {
+		netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
+			    skb->data[i]);
+		return 1;
+	}
+
+	if (skb->data[++i] != LMI_INTEG_LEN) {
+		netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
+			    skb->data[i]);
+		return 1;
+	}
+	i++;
+
+	state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
+	rxseq = skb->data[i++];	/* Should confirm our sequence */
+
+	txseq = state(hdlc)->txseq;
+
+	if (dce)
+		state(hdlc)->last_poll = jiffies;
+
+	error = 0;
+	if (!state(hdlc)->reliable)
+		error = 1;
+
+	if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
+		state(hdlc)->n391cnt = 0;
+		error = 1;
+	}
+
+	if (dce) {
+		if (state(hdlc)->fullrep_sent && !error) {
+/* Stop sending full report - the last one has been confirmed by DTE */
+			state(hdlc)->fullrep_sent = 0;
+			pvc = state(hdlc)->first_pvc;
+			while (pvc) {
+				if (pvc->state.new) {
+					pvc->state.new = 0;
+
+/* Tell DTE that new PVC is now active */
+					state(hdlc)->dce_changed = 1;
+				}
+				pvc = pvc->next;
+			}
+		}
+
+		if (state(hdlc)->dce_changed) {
+			reptype = LMI_FULLREP;
+			state(hdlc)->fullrep_sent = 1;
+			state(hdlc)->dce_changed = 0;
+		}
+
+		state(hdlc)->request = 1; /* got request */
+		fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
+		return 0;
+	}
+
+	/* DTE */
+
+	state(hdlc)->request = 0; /* got response, no request pending */
+
+	if (error)
+		return 0;
+
+	if (reptype != LMI_FULLREP)
+		return 0;
+
+	pvc = state(hdlc)->first_pvc;
+
+	while (pvc) {
+		pvc->state.deleted = 1;
+		pvc = pvc->next;
+	}
+
+	no_ram = 0;
+	while (skb->len >= i + 2 + stat_len) {
+		u16 dlci;
+		u32 bw;
+		unsigned int active, new;
+
+		if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
+				       LMI_ANSI_CISCO_PVCSTAT)) {
+			netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
+				    skb->data[i]);
+			return 1;
+		}
+
+		if (skb->data[++i] != stat_len) {
+			netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
+				    skb->data[i]);
+			return 1;
+		}
+		i++;
+
+		new = !!(skb->data[i + 2] & 0x08);
+		active = !!(skb->data[i + 2] & 0x02);
+		if (lmi == LMI_CISCO) {
+			dlci = (skb->data[i] << 8) | skb->data[i + 1];
+			bw = (skb->data[i + 3] << 16) |
+				(skb->data[i + 4] << 8) |
+				(skb->data[i + 5]);
+		} else {
+			dlci = ((skb->data[i] & 0x3F) << 4) |
+				((skb->data[i + 1] & 0x78) >> 3);
+			bw = 0;
+		}
+
+		pvc = add_pvc(dev, dlci);
+
+		if (!pvc && !no_ram) {
+			netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
+			no_ram = 1;
+		}
+
+		if (pvc) {
+			pvc->state.exist = 1;
+			pvc->state.deleted = 0;
+			if (active != pvc->state.active ||
+			    new != pvc->state.new ||
+			    bw != pvc->state.bandwidth ||
+			    !pvc->state.exist) {
+				pvc->state.new = new;
+				pvc->state.active = active;
+				pvc->state.bandwidth = bw;
+				pvc_carrier(active, pvc);
+				fr_log_dlci_active(pvc);
+			}
+		}
+
+		i += stat_len;
+	}
+
+	pvc = state(hdlc)->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;
+			pvc->state.bandwidth = 0;
+			fr_log_dlci_active(pvc);
+		}
+		pvc = pvc->next;
+	}
+
+	/* Next full report after N391 polls */
+	state(hdlc)->n391cnt = state(hdlc)->settings.n391;
+
+	return 0;
+}
+
+static int fr_snap_parse(struct sk_buff *skb, struct pvc_device *pvc)
+{
+	/* OUI 00-00-00 indicates an Ethertype follows */
+	if (skb->data[0] == 0x00 &&
+	    skb->data[1] == 0x00 &&
+	    skb->data[2] == 0x00) {
+		if (!pvc->main)
+			return -1;
+		skb->dev = pvc->main;
+		skb->protocol = *(__be16 *)(skb->data + 3); /* Ethertype */
+		skb_pull(skb, 5);
+		skb_reset_mac_header(skb);
+		return 0;
+
+	/* OUI 00-80-C2 stands for the 802.1 organization */
+	} else if (skb->data[0] == 0x00 &&
+		   skb->data[1] == 0x80 &&
+		   skb->data[2] == 0xC2) {
+		/* PID 00-07 stands for Ethernet frames without FCS */
+		if (skb->data[3] == 0x00 &&
+		    skb->data[4] == 0x07) {
+			if (!pvc->ether)
+				return -1;
+			skb_pull(skb, 5);
+			if (skb->len < ETH_HLEN)
+				return -1;
+			skb->protocol = eth_type_trans(skb, pvc->ether);
+			return 0;
+
+		/* PID unsupported */
+		} else {
+			return -1;
+		}
+
+	/* OUI unsupported */
+	} else {
+		return -1;
+	}
+}
+
+static int fr_rx(struct sk_buff *skb)
+{
+	struct net_device *frad = skb->dev;
+	hdlc_device *hdlc = dev_to_hdlc(frad);
+	struct fr_hdr *fh = (struct fr_hdr *)skb->data;
+	u8 *data = skb->data;
+	u16 dlci;
+	struct pvc_device *pvc;
+	struct net_device *dev;
+
+	if (skb->len < 4 || fh->ea1 || !fh->ea2 || data[2] != FR_UI)
+		goto rx_error;
+
+	dlci = q922_to_dlci(skb->data);
+
+	if ((dlci == LMI_CCITT_ANSI_DLCI &&
+	     (state(hdlc)->settings.lmi == LMI_ANSI ||
+	      state(hdlc)->settings.lmi == LMI_CCITT)) ||
+	    (dlci == LMI_CISCO_DLCI &&
+	     state(hdlc)->settings.lmi == LMI_CISCO)) {
+		if (fr_lmi_recv(frad, skb))
+			goto rx_error;
+		dev_kfree_skb_any(skb);
+		return NET_RX_SUCCESS;
+	}
+
+	pvc = find_pvc(hdlc, dlci);
+	if (!pvc) {
+#ifdef DEBUG_PKT
+		netdev_info(frad, "No PVC for received frame's DLCI %d\n",
+			    dlci);
+#endif
+		goto rx_drop;
+	}
+
+	if (pvc->state.fecn != fh->fecn) {
+#ifdef DEBUG_ECN
+		printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->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", frad->name,
+		       dlci, fh->becn ? "N" : "FF");
+#endif
+		pvc->state.becn ^= 1;
+	}
+
+	skb = skb_share_check(skb, GFP_ATOMIC);
+	if (!skb) {
+		frad->stats.rx_dropped++;
+		return NET_RX_DROP;
+	}
+
+	if (data[3] == NLPID_IP) {
+		if (!pvc->main)
+			goto rx_drop;
+		skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
+		skb->dev = pvc->main;
+		skb->protocol = htons(ETH_P_IP);
+		skb_reset_mac_header(skb);
+
+	} else if (data[3] == NLPID_IPV6) {
+		if (!pvc->main)
+			goto rx_drop;
+		skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
+		skb->dev = pvc->main;
+		skb->protocol = htons(ETH_P_IPV6);
+		skb_reset_mac_header(skb);
+
+	} else if (data[3] == FR_PAD) {
+		if (skb->len < 5)
+			goto rx_error;
+		if (data[4] == NLPID_SNAP) { /* A SNAP header follows */
+			skb_pull(skb, 5);
+			if (skb->len < 5) /* Incomplete SNAP header */
+				goto rx_error;
+			if (fr_snap_parse(skb, pvc))
+				goto rx_drop;
+		} else {
+			goto rx_drop;
+		}
+
+	} else {
+		netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
+			    data[3], skb->len);
+		goto rx_drop;
+	}
+
+	dev = skb->dev;
+	dev->stats.rx_packets++; /* PVC traffic */
+	dev->stats.rx_bytes += skb->len;
+	if (pvc->state.becn)
+		dev->stats.rx_compressed++;
+	netif_rx(skb);
+	return NET_RX_SUCCESS;
+
+rx_error:
+	frad->stats.rx_errors++; /* Mark error */
+rx_drop:
+	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 (state(hdlc)->settings.lmi != LMI_NONE) {
+		state(hdlc)->reliable = 0;
+		state(hdlc)->dce_changed = 1;
+		state(hdlc)->request = 0;
+		state(hdlc)->fullrep_sent = 0;
+		state(hdlc)->last_errors = 0xFFFFFFFF;
+		state(hdlc)->n391cnt = 0;
+		state(hdlc)->txseq = state(hdlc)->rxseq = 0;
+
+		state(hdlc)->dev = dev;
+		timer_setup(&state(hdlc)->timer, fr_timer, 0);
+		/* First poll after 1 s */
+		state(hdlc)->timer.expires = jiffies + HZ;
+		add_timer(&state(hdlc)->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 (state(hdlc)->settings.lmi != LMI_NONE)
+		del_timer_sync(&state(hdlc)->timer);
+	fr_set_link_state(0, dev);
+}
+
+static void fr_close(struct net_device *dev)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	struct pvc_device *pvc = state(hdlc)->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 pvc_setup(struct net_device *dev)
+{
+	dev->type = ARPHRD_DLCI;
+	dev->flags = IFF_POINTOPOINT;
+	dev->hard_header_len = 0;
+	dev->addr_len = 2;
+	netif_keep_dst(dev);
+}
+
+static const struct net_device_ops pvc_ops = {
+	.ndo_open       = pvc_open,
+	.ndo_stop       = pvc_close,
+	.ndo_start_xmit = pvc_xmit,
+	.ndo_siocwandev = pvc_ioctl,
+};
+
+static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
+{
+	hdlc_device *hdlc = dev_to_hdlc(frad);
+	struct pvc_device *pvc;
+	struct net_device *dev;
+	int used;
+
+	pvc = add_pvc(frad, dlci);
+	if (!pvc) {
+		netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
+		return -ENOBUFS;
+	}
+
+	if (*get_dev_p(pvc, type))
+		return -EEXIST;
+
+	used = pvc_is_used(pvc);
+
+	if (type == ARPHRD_ETHER)
+		dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
+				   ether_setup);
+	else
+		dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
+
+	if (!dev) {
+		netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
+		delete_unused_pvcs(hdlc);
+		return -ENOBUFS;
+	}
+
+	if (type == ARPHRD_ETHER) {
+		dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+		eth_hw_addr_random(dev);
+	} else {
+		__be16 addr = htons(dlci);
+
+		dev_addr_set(dev, (u8 *)&addr);
+		dlci_to_q922(dev->broadcast, dlci);
+	}
+	dev->netdev_ops = &pvc_ops;
+	dev->mtu = HDLC_MAX_MTU;
+	dev->min_mtu = 68;
+	dev->max_mtu = HDLC_MAX_MTU;
+	dev->needed_headroom = 10;
+	dev->priv_flags |= IFF_NO_QUEUE;
+	dev->ml_priv = pvc;
+
+	if (register_netdevice(dev) != 0) {
+		free_netdev(dev);
+		delete_unused_pvcs(hdlc);
+		return -EIO;
+	}
+
+	dev->needs_free_netdev = true;
+	*get_dev_p(pvc, type) = dev;
+	if (!used) {
+		state(hdlc)->dce_changed = 1;
+		state(hdlc)->dce_pvc_count++;
+	}
+	return 0;
+}
+
+static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
+{
+	struct pvc_device *pvc;
+	struct net_device *dev;
+
+	pvc = find_pvc(hdlc, dlci);
+	if (!pvc)
+		return -ENOENT;
+
+	dev = *get_dev_p(pvc, type);
+	if (!dev)
+		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)) {
+		state(hdlc)->dce_pvc_count--;
+		state(hdlc)->dce_changed = 1;
+	}
+	delete_unused_pvcs(hdlc);
+	return 0;
+}
+
+static void fr_destroy(struct net_device *frad)
+{
+	hdlc_device *hdlc = dev_to_hdlc(frad);
+	struct pvc_device *pvc = state(hdlc)->first_pvc;
+
+	state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
+	state(hdlc)->dce_pvc_count = 0;
+	state(hdlc)->dce_changed = 1;
+
+	while (pvc) {
+		struct 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;
+	}
+}
+
+static struct hdlc_proto proto = {
+	.close		= fr_close,
+	.start		= fr_start,
+	.stop		= fr_stop,
+	.detach		= fr_destroy,
+	.ioctl		= fr_ioctl,
+	.netif_rx	= fr_rx,
+	.module		= THIS_MODULE,
+};
+
+static int fr_ioctl(struct net_device *dev, struct if_settings *ifs)
+{
+	fr_proto __user *fr_s = ifs->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 (ifs->type) {
+	case IF_GET_PROTO:
+		if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
+			return -EINVAL;
+		ifs->type = IF_PROTO_FR;
+		if (ifs->size < size) {
+			ifs->size = size; /* data size wanted */
+			return -ENOBUFS;
+		}
+		if (copy_to_user(fr_s, &state(hdlc)->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.lmi != LMI_CISCO) ||
+		    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 (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
+			result = attach_hdlc_protocol(dev, &proto,
+						      sizeof(struct frad_state));
+			if (result)
+				return result;
+			state(hdlc)->first_pvc = NULL;
+			state(hdlc)->dce_pvc_count = 0;
+		}
+		memcpy(&state(hdlc)->settings, &new_settings, size);
+		dev->type = ARPHRD_FRAD;
+		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
+		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 (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
+			return -EINVAL;
+
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if (copy_from_user(&pvc, ifs->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 (ifs->type == IF_PROTO_FR_ADD_ETH_PVC ||
+		    ifs->type == IF_PROTO_FR_DEL_ETH_PVC)
+			result = ARPHRD_ETHER; /* bridged Ethernet device */
+		else
+			result = ARPHRD_DLCI;
+
+		if (ifs->type == IF_PROTO_FR_ADD_PVC ||
+		    ifs->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;
+}
+
+static int __init hdlc_fr_init(void)
+{
+	register_hdlc_protocol(&proto);
+	return 0;
+}
+
+static void __exit hdlc_fr_exit(void)
+{
+	unregister_hdlc_protocol(&proto);
+}
+
+module_init(hdlc_fr_init);
+module_exit(hdlc_fr_exit);
+
+MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
+MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
+MODULE_LICENSE("GPL v2");