/* * Generic HDLC support routines for Linux * Cisco HDLC support * * Copyright (C) 2000 - 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. */#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>#undef DEBUG_HARD_HEADER#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 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(struct net_device *dev, 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",		       dev->name);		return;	}	skb_reserve(skb, 4);	cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);	data = (cisco_packet*)(skb->data + 4);	data->type = htonl(type);	data->par1 = htonl(par1);	data->par2 = htonl(par2);	data->rel = 0xFFFF;	/* we will need do_div here if 1000 % HZ != 0 */	data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));	skb_put(skb, sizeof(cisco_packet));	skb->priority = TC_PRIO_CONTROL;	skb->dev = dev;	skb->nh.raw = skb->data;	dev_queue_xmit(skb);}static __be16 cisco_type_trans(struct sk_buff *skb, struct net_device *dev){	hdlc_header *data = (hdlc_header*)skb->data;	if (skb->len < sizeof(hdlc_header))		return __constant_htons(ETH_P_HDLC);	if (data->address != CISCO_MULTICAST &&	    data->address != CISCO_UNICAST)		return __constant_htons(ETH_P_HDLC);	switch(data->protocol) {	case __constant_htons(ETH_P_IP):	case __constant_htons(ETH_P_IPX):	case __constant_htons(ETH_P_IPV6):		skb_pull(skb, sizeof(hdlc_header));		return data->protocol;	default:		return __constant_htons(ETH_P_HDLC);	}}static int cisco_rx(struct sk_buff *skb){	struct net_device *dev = skb->dev;	hdlc_device *hdlc = dev_to_hdlc(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;	switch(ntohs(data->protocol)) {	case CISCO_SYS_INFO:		/* Packet is not needed, drop it. */		dev_kfree_skb_any(skb);		return NET_RX_SUCCESS;	case CISCO_KEEPALIVE:		if (skb->len != sizeof(hdlc_header) + CISCO_PACKET_LEN &&		    skb->len != sizeof(hdlc_header) + CISCO_BIG_PACKET_LEN) {			printk(KERN_INFO "%s: Invalid length of Cisco "			       "control packet (%d bytes)\n",			       dev->name, skb->len);			goto rx_error;		}		cisco_data = (cisco_packet*)(skb->data + sizeof(hdlc_header));		switch(ntohl (cisco_data->type)) {		case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */			in_dev = dev->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(dev->name,						   (*ifap)->ifa_label) == 0) {						addr = (*ifap)->ifa_local;						mask = (*ifap)->ifa_mask;						break;					}					ifap = &(*ifap)->ifa_next;				}				cisco_keepalive_send(dev, CISCO_ADDR_REPLY,						     addr, mask);			}			dev_kfree_skb_any(skb);			return NET_RX_SUCCESS;		case CISCO_ADDR_REPLY:			printk(KERN_INFO "%s: Unexpected Cisco IP address "			       "reply\n", dev->name);			goto rx_error;		case CISCO_KEEPALIVE_REQ:			hdlc->state.cisco.rxseq = ntohl(cisco_data->par1);			if (hdlc->state.cisco.request_sent &&			    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",					       dev->name, days, hrs,					       min, sec);#if 0					netif_carrier_on(dev);#endif					hdlc->state.cisco.up = 1;				}			}			dev_kfree_skb_any(skb);			return NET_RX_SUCCESS;		} /* switch(keepalive type) */	} /* switch(protocol) */	printk(KERN_INFO "%s: Unsupported protocol %x\n", dev->name,	       data->protocol);	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 cisco_timer(unsigned long arg){	struct net_device *dev = (struct net_device *)arg;	hdlc_device *hdlc = dev_to_hdlc(dev);	if (hdlc->state.cisco.up &&	    time_after(jiffies, hdlc->state.cisco.last_poll +		       hdlc->state.cisco.settings.timeout * HZ)) {		hdlc->state.cisco.up = 0;		printk(KERN_INFO "%s: Link down\n", dev->name);#if 0		netif_carrier_off(dev);#endif	}	cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ,			     ++hdlc->state.cisco.txseq,			     hdlc->state.cisco.rxseq);	hdlc->state.cisco.request_sent = 1;	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 void cisco_start(struct net_device *dev){	hdlc_device *hdlc = dev_to_hdlc(dev);	hdlc->state.cisco.up = 0;	hdlc->state.cisco.request_sent = 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)dev;	add_timer(&hdlc->state.cisco.timer);}static void cisco_stop(struct net_device *dev){	hdlc_device *hdlc = dev_to_hdlc(dev);	del_timer_sync(&hdlc->state.cisco.timer);#if 0	if (netif_carrier_ok(dev))		netif_carrier_off(dev);#endif	hdlc->state.cisco.up = 0;	hdlc->state.cisco.request_sent = 0;}int hdlc_cisco_ioctl(struct net_device *dev, struct ifreq *ifr){	cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;	const size_t size = sizeof(cisco_proto);	cisco_proto new_settings;	hdlc_device *hdlc = dev_to_hdlc(dev);	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(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);		if (result)			return result;		hdlc_proto_detach(hdlc);		memcpy(&hdlc->state.cisco.settings, &new_settings, size);		memset(&hdlc->proto, 0, sizeof(hdlc->proto));		hdlc->proto.start = cisco_start;		hdlc->proto.stop = cisco_stop;		hdlc->proto.netif_rx = cisco_rx;		hdlc->proto.type_trans = cisco_type_trans;		hdlc->proto.id = IF_PROTO_CISCO;		dev->hard_start_xmit = hdlc->xmit;		dev->hard_header = cisco_hard_header;		dev->hard_header_cache = NULL;		dev->type = ARPHRD_CISCO;		dev->flags = IFF_POINTOPOINT | IFF_NOARP;		dev->addr_len = 0;		return 0;	}	return -EINVAL;}