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path: root/drivers/net/wan/hdlc_cisco.c
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Diffstat (limited to 'drivers/net/wan/hdlc_cisco.c')
-rw-r--r--drivers/net/wan/hdlc_cisco.c330
1 files changed, 330 insertions, 0 deletions
diff --git a/drivers/net/wan/hdlc_cisco.c b/drivers/net/wan/hdlc_cisco.c
new file mode 100644
index 00000000000..c1b6896d700
--- /dev/null
+++ b/drivers/net/wan/hdlc_cisco.c
@@ -0,0 +1,330 @@
+/*
+ * 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->tail;
+
+ 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 unsigned short 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);
+ netif_carrier_on(dev);
+ 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);
+ netif_carrier_off(dev);
+ }
+
+ 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 (netif_carrier_ok(dev))
+ netif_carrier_off(dev);
+ 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;
+}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-19 08:15:31 +0000