patch-2.4.21 linux-2.4.21/drivers/net/wan/hdlc_fr.c
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- 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;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)