330 lines
8.4 KiB
C
330 lines
8.4 KiB
C
/*
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* Generic HDLC support routines for Linux
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* Cisco HDLC support
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*
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* Copyright (C) 2000 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/errno.h>
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#include <linux/if_arp.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/pkt_sched.h>
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#include <linux/inetdevice.h>
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#include <linux/lapb.h>
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#include <linux/rtnetlink.h>
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#include <linux/hdlc.h>
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#undef DEBUG_HARD_HEADER
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#define CISCO_MULTICAST 0x8F /* Cisco multicast address */
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#define CISCO_UNICAST 0x0F /* Cisco unicast address */
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#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
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#define CISCO_SYS_INFO 0x2000 /* Cisco interface/system info */
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#define CISCO_ADDR_REQ 0 /* Cisco address request */
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#define CISCO_ADDR_REPLY 1 /* Cisco address reply */
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#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
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static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev,
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u16 type, void *daddr, void *saddr,
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unsigned int len)
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{
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hdlc_header *data;
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#ifdef DEBUG_HARD_HEADER
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printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name);
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#endif
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skb_push(skb, sizeof(hdlc_header));
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data = (hdlc_header*)skb->data;
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if (type == CISCO_KEEPALIVE)
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data->address = CISCO_MULTICAST;
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else
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data->address = CISCO_UNICAST;
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data->control = 0;
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data->protocol = htons(type);
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return sizeof(hdlc_header);
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}
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static void cisco_keepalive_send(struct net_device *dev, u32 type,
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u32 par1, u32 par2)
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{
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struct sk_buff *skb;
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cisco_packet *data;
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skb = dev_alloc_skb(sizeof(hdlc_header) + sizeof(cisco_packet));
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if (!skb) {
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printk(KERN_WARNING
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"%s: Memory squeeze on cisco_keepalive_send()\n",
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dev->name);
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return;
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}
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skb_reserve(skb, 4);
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cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);
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data = (cisco_packet*)skb->data;
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data->type = htonl(type);
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data->par1 = htonl(par1);
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data->par2 = htonl(par2);
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data->rel = 0xFFFF;
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/* we will need do_div here if 1000 % HZ != 0 */
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data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));
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skb_put(skb, sizeof(cisco_packet));
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skb->priority = TC_PRIO_CONTROL;
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skb->dev = dev;
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skb->nh.raw = skb->data;
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dev_queue_xmit(skb);
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}
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static __be16 cisco_type_trans(struct sk_buff *skb, struct net_device *dev)
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{
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hdlc_header *data = (hdlc_header*)skb->data;
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if (skb->len < sizeof(hdlc_header))
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return __constant_htons(ETH_P_HDLC);
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if (data->address != CISCO_MULTICAST &&
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data->address != CISCO_UNICAST)
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return __constant_htons(ETH_P_HDLC);
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switch(data->protocol) {
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case __constant_htons(ETH_P_IP):
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case __constant_htons(ETH_P_IPX):
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case __constant_htons(ETH_P_IPV6):
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skb_pull(skb, sizeof(hdlc_header));
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return data->protocol;
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default:
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return __constant_htons(ETH_P_HDLC);
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}
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}
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static int cisco_rx(struct sk_buff *skb)
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{
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struct net_device *dev = skb->dev;
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hdlc_device *hdlc = dev_to_hdlc(dev);
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hdlc_header *data = (hdlc_header*)skb->data;
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cisco_packet *cisco_data;
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struct in_device *in_dev;
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u32 addr, mask;
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if (skb->len < sizeof(hdlc_header))
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goto rx_error;
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if (data->address != CISCO_MULTICAST &&
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data->address != CISCO_UNICAST)
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goto rx_error;
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switch(ntohs(data->protocol)) {
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case CISCO_SYS_INFO:
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/* Packet is not needed, drop it. */
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dev_kfree_skb_any(skb);
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return NET_RX_SUCCESS;
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case CISCO_KEEPALIVE:
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if (skb->len != sizeof(hdlc_header) + CISCO_PACKET_LEN &&
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skb->len != sizeof(hdlc_header) + CISCO_BIG_PACKET_LEN) {
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printk(KERN_INFO "%s: Invalid length of Cisco "
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"control packet (%d bytes)\n",
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dev->name, skb->len);
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goto rx_error;
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}
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cisco_data = (cisco_packet*)(skb->data + sizeof(hdlc_header));
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switch(ntohl (cisco_data->type)) {
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case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
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in_dev = dev->ip_ptr;
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addr = 0;
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mask = ~0; /* is the mask correct? */
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if (in_dev != NULL) {
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struct in_ifaddr **ifap = &in_dev->ifa_list;
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while (*ifap != NULL) {
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if (strcmp(dev->name,
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(*ifap)->ifa_label) == 0) {
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addr = (*ifap)->ifa_local;
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mask = (*ifap)->ifa_mask;
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break;
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}
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ifap = &(*ifap)->ifa_next;
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}
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cisco_keepalive_send(dev, CISCO_ADDR_REPLY,
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addr, mask);
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}
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dev_kfree_skb_any(skb);
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return NET_RX_SUCCESS;
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case CISCO_ADDR_REPLY:
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printk(KERN_INFO "%s: Unexpected Cisco IP address "
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"reply\n", dev->name);
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goto rx_error;
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case CISCO_KEEPALIVE_REQ:
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hdlc->state.cisco.rxseq = ntohl(cisco_data->par1);
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if (hdlc->state.cisco.request_sent &&
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ntohl(cisco_data->par2)==hdlc->state.cisco.txseq) {
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hdlc->state.cisco.last_poll = jiffies;
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if (!hdlc->state.cisco.up) {
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u32 sec, min, hrs, days;
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sec = ntohl(cisco_data->time) / 1000;
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min = sec / 60; sec -= min * 60;
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hrs = min / 60; min -= hrs * 60;
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days = hrs / 24; hrs -= days * 24;
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printk(KERN_INFO "%s: Link up (peer "
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"uptime %ud%uh%um%us)\n",
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dev->name, days, hrs,
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min, sec);
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netif_carrier_on(dev);
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hdlc->state.cisco.up = 1;
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}
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}
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dev_kfree_skb_any(skb);
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return NET_RX_SUCCESS;
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} /* switch(keepalive type) */
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} /* switch(protocol) */
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printk(KERN_INFO "%s: Unsupported protocol %x\n", dev->name,
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data->protocol);
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dev_kfree_skb_any(skb);
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return NET_RX_DROP;
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rx_error:
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hdlc->stats.rx_errors++; /* Mark error */
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dev_kfree_skb_any(skb);
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return NET_RX_DROP;
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}
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static void cisco_timer(unsigned long arg)
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{
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struct net_device *dev = (struct net_device *)arg;
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hdlc_device *hdlc = dev_to_hdlc(dev);
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if (hdlc->state.cisco.up &&
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time_after(jiffies, hdlc->state.cisco.last_poll +
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hdlc->state.cisco.settings.timeout * HZ)) {
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hdlc->state.cisco.up = 0;
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printk(KERN_INFO "%s: Link down\n", dev->name);
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netif_carrier_off(dev);
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}
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cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ,
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++hdlc->state.cisco.txseq,
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hdlc->state.cisco.rxseq);
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hdlc->state.cisco.request_sent = 1;
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hdlc->state.cisco.timer.expires = jiffies +
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hdlc->state.cisco.settings.interval * HZ;
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hdlc->state.cisco.timer.function = cisco_timer;
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hdlc->state.cisco.timer.data = arg;
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add_timer(&hdlc->state.cisco.timer);
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}
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static void cisco_start(struct net_device *dev)
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{
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hdlc_device *hdlc = dev_to_hdlc(dev);
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hdlc->state.cisco.up = 0;
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hdlc->state.cisco.request_sent = 0;
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hdlc->state.cisco.txseq = hdlc->state.cisco.rxseq = 0;
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init_timer(&hdlc->state.cisco.timer);
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hdlc->state.cisco.timer.expires = jiffies + HZ; /*First poll after 1s*/
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hdlc->state.cisco.timer.function = cisco_timer;
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hdlc->state.cisco.timer.data = (unsigned long)dev;
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add_timer(&hdlc->state.cisco.timer);
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}
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static void cisco_stop(struct net_device *dev)
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{
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hdlc_device *hdlc = dev_to_hdlc(dev);
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del_timer_sync(&hdlc->state.cisco.timer);
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if (netif_carrier_ok(dev))
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netif_carrier_off(dev);
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hdlc->state.cisco.up = 0;
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hdlc->state.cisco.request_sent = 0;
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}
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int hdlc_cisco_ioctl(struct net_device *dev, struct ifreq *ifr)
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{
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cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
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const size_t size = sizeof(cisco_proto);
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cisco_proto new_settings;
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hdlc_device *hdlc = dev_to_hdlc(dev);
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int result;
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switch (ifr->ifr_settings.type) {
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case IF_GET_PROTO:
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ifr->ifr_settings.type = IF_PROTO_CISCO;
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if (ifr->ifr_settings.size < size) {
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ifr->ifr_settings.size = size; /* data size wanted */
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return -ENOBUFS;
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}
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if (copy_to_user(cisco_s, &hdlc->state.cisco.settings, size))
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return -EFAULT;
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return 0;
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case IF_PROTO_CISCO:
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if(!capable(CAP_NET_ADMIN))
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return -EPERM;
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if(dev->flags & IFF_UP)
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return -EBUSY;
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if (copy_from_user(&new_settings, cisco_s, size))
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return -EFAULT;
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if (new_settings.interval < 1 ||
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new_settings.timeout < 2)
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return -EINVAL;
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result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
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if (result)
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return result;
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hdlc_proto_detach(hdlc);
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memcpy(&hdlc->state.cisco.settings, &new_settings, size);
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memset(&hdlc->proto, 0, sizeof(hdlc->proto));
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hdlc->proto.start = cisco_start;
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hdlc->proto.stop = cisco_stop;
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hdlc->proto.netif_rx = cisco_rx;
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hdlc->proto.type_trans = cisco_type_trans;
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hdlc->proto.id = IF_PROTO_CISCO;
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dev->hard_start_xmit = hdlc->xmit;
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dev->hard_header = cisco_hard_header;
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dev->hard_header_cache = NULL;
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dev->type = ARPHRD_CISCO;
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dev->flags = IFF_POINTOPOINT | IFF_NOARP;
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dev->addr_len = 0;
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return 0;
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}
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return -EINVAL;
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}
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