87496843681a874d463b6aaa5ae56a73cb548ab6
[linux-2.6.git] / drivers / net / wan / hdlc_cisco.c
1 /*
2  * Generic HDLC support routines for Linux
3  * Cisco HDLC support
4  *
5  * Copyright (C) 2000 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of version 2 of the GNU General Public License
9  * as published by the Free Software Foundation.
10  */
11
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/poll.h>
16 #include <linux/errno.h>
17 #include <linux/if_arp.h>
18 #include <linux/init.h>
19 #include <linux/skbuff.h>
20 #include <linux/pkt_sched.h>
21 #include <linux/inetdevice.h>
22 #include <linux/lapb.h>
23 #include <linux/rtnetlink.h>
24 #include <linux/hdlc.h>
25
26 #undef DEBUG_HARD_HEADER
27
28 #define CISCO_MULTICAST         0x8F    /* Cisco multicast address */
29 #define CISCO_UNICAST           0x0F    /* Cisco unicast address */
30 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
31 #define CISCO_SYS_INFO          0x2000  /* Cisco interface/system info */
32 #define CISCO_ADDR_REQ          0       /* Cisco address request */
33 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
34 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
35
36
37 static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev,
38                              u16 type, void *daddr, void *saddr,
39                              unsigned int len)
40 {
41         hdlc_header *data;
42 #ifdef DEBUG_HARD_HEADER
43         printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name);
44 #endif
45
46         skb_push(skb, sizeof(hdlc_header));
47         data = (hdlc_header*)skb->data;
48         if (type == CISCO_KEEPALIVE)
49                 data->address = CISCO_MULTICAST;
50         else
51                 data->address = CISCO_UNICAST;
52         data->control = 0;
53         data->protocol = htons(type);
54
55         return sizeof(hdlc_header);
56 }
57
58
59
60 static void cisco_keepalive_send(struct net_device *dev, u32 type,
61                                  u32 par1, u32 par2)
62 {
63         struct sk_buff *skb;
64         cisco_packet *data;
65
66         skb = dev_alloc_skb(sizeof(hdlc_header) + sizeof(cisco_packet));
67         if (!skb) {
68                 printk(KERN_WARNING
69                        "%s: Memory squeeze on cisco_keepalive_send()\n",
70                        dev->name);
71                 return;
72         }
73         skb_reserve(skb, 4);
74         cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);
75         data = (cisco_packet*)skb->data;
76
77         data->type = htonl(type);
78         data->par1 = htonl(par1);
79         data->par2 = htonl(par2);
80         data->rel = 0xFFFF;
81         /* we will need do_div here if 1000 % HZ != 0 */
82         data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));
83
84         skb_put(skb, sizeof(cisco_packet));
85         skb->priority = TC_PRIO_CONTROL;
86         skb->dev = dev;
87         skb->nh.raw = skb->data;
88
89         dev_queue_xmit(skb);
90 }
91
92
93
94 static unsigned short cisco_type_trans(struct sk_buff *skb,
95                                        struct net_device *dev)
96 {
97         hdlc_header *data = (hdlc_header*)skb->data;
98
99         if (skb->len < sizeof(hdlc_header))
100                 return __constant_htons(ETH_P_HDLC);
101
102         if (data->address != CISCO_MULTICAST &&
103             data->address != CISCO_UNICAST)
104                 return __constant_htons(ETH_P_HDLC);
105
106         switch(data->protocol) {
107         case __constant_htons(ETH_P_IP):
108         case __constant_htons(ETH_P_IPX):
109         case __constant_htons(ETH_P_IPV6):
110                 skb_pull(skb, sizeof(hdlc_header));
111                 return data->protocol;
112         default:
113                 return __constant_htons(ETH_P_HDLC);
114         }
115 }
116
117
118 static int cisco_rx(struct sk_buff *skb)
119 {
120         struct net_device *dev = skb->dev;
121         hdlc_device *hdlc = dev_to_hdlc(dev);
122         hdlc_header *data = (hdlc_header*)skb->data;
123         cisco_packet *cisco_data;
124         struct in_device *in_dev;
125         u32 addr, mask;
126
127         if (skb->len < sizeof(hdlc_header))
128                 goto rx_error;
129
130         if (data->address != CISCO_MULTICAST &&
131             data->address != CISCO_UNICAST)
132                 goto rx_error;
133
134         switch(ntohs(data->protocol)) {
135         case CISCO_SYS_INFO:
136                 /* Packet is not needed, drop it. */
137                 dev_kfree_skb_any(skb);
138                 return NET_RX_SUCCESS;
139
140         case CISCO_KEEPALIVE:
141                 if (skb->len != sizeof(hdlc_header) + CISCO_PACKET_LEN &&
142                     skb->len != sizeof(hdlc_header) + CISCO_BIG_PACKET_LEN) {
143                         printk(KERN_INFO "%s: Invalid length of Cisco "
144                                "control packet (%d bytes)\n",
145                                dev->name, skb->len);
146                         goto rx_error;
147                 }
148
149                 cisco_data = (cisco_packet*)(skb->data + sizeof(hdlc_header));
150
151                 switch(ntohl (cisco_data->type)) {
152                 case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
153                         in_dev = dev->ip_ptr;
154                         addr = 0;
155                         mask = ~0; /* is the mask correct? */
156
157                         if (in_dev != NULL) {
158                                 struct in_ifaddr **ifap = &in_dev->ifa_list;
159
160                                 while (*ifap != NULL) {
161                                         if (strcmp(dev->name,
162                                                    (*ifap)->ifa_label) == 0) {
163                                                 addr = (*ifap)->ifa_local;
164                                                 mask = (*ifap)->ifa_mask;
165                                                 break;
166                                         }
167                                         ifap = &(*ifap)->ifa_next;
168                                 }
169
170                                 cisco_keepalive_send(dev, CISCO_ADDR_REPLY,
171                                                      addr, mask);
172                         }
173                         dev_kfree_skb_any(skb);
174                         return NET_RX_SUCCESS;
175
176                 case CISCO_ADDR_REPLY:
177                         printk(KERN_INFO "%s: Unexpected Cisco IP address "
178                                "reply\n", dev->name);
179                         goto rx_error;
180
181                 case CISCO_KEEPALIVE_REQ:
182                         hdlc->state.cisco.rxseq = ntohl(cisco_data->par1);
183                         if (hdlc->state.cisco.request_sent &&
184                             ntohl(cisco_data->par2)==hdlc->state.cisco.txseq) {
185                                 hdlc->state.cisco.last_poll = jiffies;
186                                 if (!hdlc->state.cisco.up) {
187                                         u32 sec, min, hrs, days;
188                                         sec = ntohl(cisco_data->time) / 1000;
189                                         min = sec / 60; sec -= min * 60;
190                                         hrs = min / 60; min -= hrs * 60;
191                                         days = hrs / 24; hrs -= days * 24;
192                                         printk(KERN_INFO "%s: Link up (peer "
193                                                "uptime %ud%uh%um%us)\n",
194                                                dev->name, days, hrs,
195                                                min, sec);
196                                         netif_carrier_on(dev);
197                                         hdlc->state.cisco.up = 1;
198                                 }
199                         }
200
201                         dev_kfree_skb_any(skb);
202                         return NET_RX_SUCCESS;
203                 } /* switch(keepalive type) */
204         } /* switch(protocol) */
205
206         printk(KERN_INFO "%s: Unsupported protocol %x\n", dev->name,
207                data->protocol);
208         dev_kfree_skb_any(skb);
209         return NET_RX_DROP;
210
211  rx_error:
212         hdlc->stats.rx_errors++; /* Mark error */
213         dev_kfree_skb_any(skb);
214         return NET_RX_DROP;
215 }
216
217
218
219 static void cisco_timer(unsigned long arg)
220 {
221         struct net_device *dev = (struct net_device *)arg;
222         hdlc_device *hdlc = dev_to_hdlc(dev);
223
224         if (hdlc->state.cisco.up &&
225             time_after(jiffies, hdlc->state.cisco.last_poll +
226                        hdlc->state.cisco.settings.timeout * HZ)) {
227                 hdlc->state.cisco.up = 0;
228                 printk(KERN_INFO "%s: Link down\n", dev->name);
229                 netif_carrier_off(dev);
230         }
231
232         cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ,
233                              ++hdlc->state.cisco.txseq,
234                              hdlc->state.cisco.rxseq);
235         hdlc->state.cisco.request_sent = 1;
236         hdlc->state.cisco.timer.expires = jiffies +
237                 hdlc->state.cisco.settings.interval * HZ;
238         hdlc->state.cisco.timer.function = cisco_timer;
239         hdlc->state.cisco.timer.data = arg;
240         add_timer(&hdlc->state.cisco.timer);
241 }
242
243
244
245 static void cisco_start(struct net_device *dev)
246 {
247         hdlc_device *hdlc = dev_to_hdlc(dev);
248         hdlc->state.cisco.up = 0;
249         hdlc->state.cisco.request_sent = 0;
250         hdlc->state.cisco.txseq = hdlc->state.cisco.rxseq = 0;
251
252         init_timer(&hdlc->state.cisco.timer);
253         hdlc->state.cisco.timer.expires = jiffies + HZ; /*First poll after 1s*/
254         hdlc->state.cisco.timer.function = cisco_timer;
255         hdlc->state.cisco.timer.data = (unsigned long)dev;
256         add_timer(&hdlc->state.cisco.timer);
257 }
258
259
260
261 static void cisco_stop(struct net_device *dev)
262 {
263         hdlc_device *hdlc = dev_to_hdlc(dev);
264         del_timer_sync(&hdlc->state.cisco.timer);
265         if (netif_carrier_ok(dev))
266                 netif_carrier_off(dev);
267         hdlc->state.cisco.up = 0;
268         hdlc->state.cisco.request_sent = 0;
269 }
270
271
272
273 int hdlc_cisco_ioctl(struct net_device *dev, struct ifreq *ifr)
274 {
275         cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
276         const size_t size = sizeof(cisco_proto);
277         cisco_proto new_settings;
278         hdlc_device *hdlc = dev_to_hdlc(dev);
279         int result;
280
281         switch (ifr->ifr_settings.type) {
282         case IF_GET_PROTO:
283                 ifr->ifr_settings.type = IF_PROTO_CISCO;
284                 if (ifr->ifr_settings.size < size) {
285                         ifr->ifr_settings.size = size; /* data size wanted */
286                         return -ENOBUFS;
287                 }
288                 if (copy_to_user(cisco_s, &hdlc->state.cisco.settings, size))
289                         return -EFAULT;
290                 return 0;
291
292         case IF_PROTO_CISCO:
293                 if(!capable(CAP_NET_ADMIN))
294                         return -EPERM;
295
296                 if(dev->flags & IFF_UP)
297                         return -EBUSY;
298
299                 if (copy_from_user(&new_settings, cisco_s, size))
300                         return -EFAULT;
301
302                 if (new_settings.interval < 1 ||
303                     new_settings.timeout < 2)
304                         return -EINVAL;
305
306                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
307
308                 if (result)
309                         return result;
310
311                 hdlc_proto_detach(hdlc);
312                 memcpy(&hdlc->state.cisco.settings, &new_settings, size);
313                 memset(&hdlc->proto, 0, sizeof(hdlc->proto));
314
315                 hdlc->proto.start = cisco_start;
316                 hdlc->proto.stop = cisco_stop;
317                 hdlc->proto.netif_rx = cisco_rx;
318                 hdlc->proto.type_trans = cisco_type_trans;
319                 hdlc->proto.id = IF_PROTO_CISCO;
320                 dev->hard_start_xmit = hdlc->xmit;
321                 dev->hard_header = cisco_hard_header;
322                 dev->hard_header_cache = NULL;
323                 dev->type = ARPHRD_CISCO;
324                 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
325                 dev->addr_len = 0;
326                 return 0;
327         }
328
329         return -EINVAL;
330 }