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

• Lines: 301
• Date: 2003-06-13 07:51:35.000000000 -0700
• Orig file: linux-2.4.20/drivers/net/wan/hdlc_cisco.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.20/drivers/net/wan/hdlc_cisco.c linux-2.4.21/drivers/net/wan/hdlc_cisco.c
@@ -0,0 +1,300 @@
+/*
+ * Generic HDLC support routines for Linux
+ * Cisco HDLC support
+ *
+ * Copyright (C) 2000 - 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>
+
+
+#define CISCO_MULTICAST		0x8F	/* Cisco multicast address */
+#define CISCO_UNICAST		0x0F	/* Cisco unicast address */
+#define CISCO_KEEPALIVE		0x8035	/* Cisco keepalive protocol */
+#define CISCO_SYS_INFO		0x2000	/* Cisco interface/system info */
+#define CISCO_ADDR_REQ		0	/* Cisco address request */
+#define CISCO_ADDR_REPLY	1	/* Cisco address reply */
+#define CISCO_KEEPALIVE_REQ	2	/* Cisco keepalive request */
+
+
+static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev,
+			     u16 type, void *daddr, void *saddr,
+			     unsigned int len)
+{
+	hdlc_header *data;
+#ifdef CONFIG_HDLC_DEBUG_HARD_HEADER
+	printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name);
+#endif
+
+	skb_push(skb, sizeof(hdlc_header));
+	data = (hdlc_header*)skb->data;
+	if (type == CISCO_KEEPALIVE)
+		data->address = CISCO_MULTICAST;
+	else
+		data->address = CISCO_UNICAST;
+	data->control = 0;
+	data->protocol = htons(type);
+
+	return sizeof(hdlc_header);
+}
+
+
+
+static void cisco_keepalive_send(hdlc_device *hdlc, u32 type,
+				 u32 par1, u32 par2)
+{
+	struct sk_buff *skb;
+	cisco_packet *data;
+
+	skb = dev_alloc_skb(sizeof(hdlc_header) + sizeof(cisco_packet));
+	if (!skb) {
+		printk(KERN_WARNING
+		       "%s: Memory squeeze on cisco_keepalive_send()\n",
+		       hdlc_to_name(hdlc));
+		return;
+	}
+	skb_reserve(skb, 4);
+	cisco_hard_header(skb, hdlc_to_dev(hdlc), CISCO_KEEPALIVE,
+			  NULL, NULL, 0);
+	data = (cisco_packet*)skb->tail;
+
+	data->type = htonl(type);
+	data->par1 = htonl(par1);
+	data->par2 = htonl(par2);
+	data->rel = 0xFFFF;
+	data->time = htonl(jiffies * 1000 / HZ);
+
+	skb_put(skb, sizeof(cisco_packet));
+	skb->priority = TC_PRIO_CONTROL;
+	skb->dev = hdlc_to_dev(hdlc);
+
+	dev_queue_xmit(skb);
+}
+
+
+
+static void cisco_rx(struct sk_buff *skb)
+{
+	hdlc_device *hdlc = dev_to_hdlc(skb->dev);
+	hdlc_header *data = (hdlc_header*)skb->data;
+	cisco_packet *cisco_data;
+	struct in_device *in_dev;
+	u32 addr, mask;
+
+	if (skb->len < sizeof(hdlc_header))
+		goto rx_error;
+
+	if (data->address != CISCO_MULTICAST &&
+	    data->address != CISCO_UNICAST)
+		goto rx_error;
+
+	skb_pull(skb, sizeof(hdlc_header));
+
+	switch(ntohs(data->protocol)) {
+	case ETH_P_IP:
+	case ETH_P_IPX:
+	case ETH_P_IPV6:
+		skb->protocol = data->protocol;
+		skb->dev = hdlc_to_dev(hdlc);
+		netif_rx(skb);
+		return;
+
+	case CISCO_SYS_INFO:
+		/* Packet is not needed, drop it. */
+		dev_kfree_skb_any(skb);
+		return;
+
+	case CISCO_KEEPALIVE:
+		if (skb->len != CISCO_PACKET_LEN &&
+		    skb->len != CISCO_BIG_PACKET_LEN) {
+			printk(KERN_INFO "%s: Invalid length of Cisco "
+			       "control packet (%d bytes)\n",
+			       hdlc_to_name(hdlc), skb->len);
+			goto rx_error;
+		}
+
+		cisco_data = (cisco_packet*)skb->data;
+
+		switch(ntohl (cisco_data->type)) {
+		case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
+			in_dev = hdlc_to_dev(hdlc)->ip_ptr;
+			addr = 0;
+			mask = ~0; /* is the mask correct? */
+
+			if (in_dev != NULL) {
+				struct in_ifaddr **ifap = &in_dev->ifa_list;
+
+				while (*ifap != NULL) {
+					if (strcmp(hdlc_to_name(hdlc),
+						   (*ifap)->ifa_label) == 0) {
+						addr = (*ifap)->ifa_local;
+						mask = (*ifap)->ifa_mask;
+						break;
+					}
+					ifap = &(*ifap)->ifa_next;
+				}
+
+				cisco_keepalive_send(hdlc, CISCO_ADDR_REPLY,
+						     addr, mask);
+			}
+			dev_kfree_skb_any(skb);
+			return;
+
+		case CISCO_ADDR_REPLY:
+			printk(KERN_INFO "%s: Unexpected Cisco IP address "
+			       "reply\n", hdlc_to_name(hdlc));
+			goto rx_error;
+
+		case CISCO_KEEPALIVE_REQ:
+			hdlc->state.cisco.rxseq = ntohl(cisco_data->par1);
+			if (ntohl(cisco_data->par2) == hdlc->state.cisco.txseq) {
+				hdlc->state.cisco.last_poll = jiffies;
+				if (!hdlc->state.cisco.up) {
+					u32 sec, min, hrs, days;
+					sec = ntohl(cisco_data->time) / 1000;
+					min = sec / 60; sec -= min * 60;
+					hrs = min / 60; min -= hrs * 60;
+					days = hrs / 24; hrs -= days * 24;
+					printk(KERN_INFO "%s: Link up (peer "
+					       "uptime %ud%uh%um%us)\n",
+					       hdlc_to_name(hdlc), days, hrs,
+					       min, sec);
+				}
+				hdlc->state.cisco.up = 1;
+			}
+
+			dev_kfree_skb_any(skb);
+			return;
+		} /* switch(keepalive type) */
+	} /* switch(protocol) */
+
+	printk(KERN_INFO "%s: Unsupported protocol %x\n", hdlc_to_name(hdlc),
+	       data->protocol);
+	dev_kfree_skb_any(skb);
+	return;
+
+ rx_error:
+	hdlc->stats.rx_errors++; /* Mark error */
+	dev_kfree_skb_any(skb);
+}
+
+
+
+static void cisco_timer(unsigned long arg)
+{
+	hdlc_device *hdlc = (hdlc_device*)arg;
+
+	if (hdlc->state.cisco.up &&
+	    jiffies - hdlc->state.cisco.last_poll >=
+	    hdlc->state.cisco.settings.timeout * HZ) {
+		hdlc->state.cisco.up = 0;
+		printk(KERN_INFO "%s: Link down\n", hdlc_to_name(hdlc));
+	}
+
+	cisco_keepalive_send(hdlc, CISCO_KEEPALIVE_REQ,
+			     ++hdlc->state.cisco.txseq,
+			     hdlc->state.cisco.rxseq);
+	hdlc->state.cisco.timer.expires = jiffies +
+		hdlc->state.cisco.settings.interval * HZ;
+	hdlc->state.cisco.timer.function = cisco_timer;
+	hdlc->state.cisco.timer.data = arg;
+	add_timer(&hdlc->state.cisco.timer);
+}
+
+
+
+static int cisco_open(hdlc_device *hdlc)
+{
+	hdlc->state.cisco.last_poll = 0;
+	hdlc->state.cisco.up = 0;
+	hdlc->state.cisco.txseq = hdlc->state.cisco.rxseq = 0;
+
+	init_timer(&hdlc->state.cisco.timer);
+	hdlc->state.cisco.timer.expires = jiffies + HZ; /*First poll after 1s*/
+	hdlc->state.cisco.timer.function = cisco_timer;
+	hdlc->state.cisco.timer.data = (unsigned long)hdlc;
+	add_timer(&hdlc->state.cisco.timer);
+	return 0;
+}
+
+
+
+static void cisco_close(hdlc_device *hdlc)
+{
+	del_timer_sync(&hdlc->state.cisco.timer);
+}
+
+
+
+int hdlc_cisco_ioctl(hdlc_device *hdlc, struct ifreq *ifr)
+{
+	cisco_proto *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
+	const size_t size = sizeof(cisco_proto);
+	cisco_proto new_settings;
+	struct net_device *dev = hdlc_to_dev(hdlc);
+	int result;
+
+	switch (ifr->ifr_settings.type) {
+	case IF_GET_PROTO:
+		ifr->ifr_settings.type = IF_PROTO_CISCO;
+		if (ifr->ifr_settings.size < size) {
+			ifr->ifr_settings.size = size; /* data size wanted */
+			return -ENOBUFS;
+		}
+		if (copy_to_user(cisco_s, &hdlc->state.cisco.settings, size))
+			return -EFAULT;
+		return 0;
+
+	case IF_PROTO_CISCO:
+		if(!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if(dev->flags & IFF_UP)
+			return -EBUSY;
+
+		if (copy_from_user(&new_settings, cisco_s, size))
+			return -EFAULT;
+
+		if (new_settings.interval < 1 ||
+		    new_settings.timeout < 2)
+			return -EINVAL;
+
+		result=hdlc->attach(hdlc, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
+
+		if (result)
+			return result;
+
+		hdlc_proto_detach(hdlc);
+		memcpy(&hdlc->state.cisco.settings, &new_settings, size);
+
+		hdlc->open = cisco_open;
+		hdlc->stop = cisco_close;
+		hdlc->netif_rx = cisco_rx;
+		hdlc->proto = IF_PROTO_CISCO;
+		dev->hard_start_xmit = hdlc->xmit;
+		dev->hard_header = cisco_hard_header;
+		dev->type = ARPHRD_CISCO;
+		dev->addr_len = 0;
+		return 0;
+	}
+
+	return -EINVAL;
+}