Merge branch 'halasa-hdlc' of git://git.tuxdriver.com/git/netdev-jwl
[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 + 4);
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 __be16 cisco_type_trans(struct sk_buff *skb, struct net_device *dev)
95 {
96         hdlc_header *data = (hdlc_header*)skb->data;
97
98         if (skb->len < sizeof(hdlc_header))
99                 return __constant_htons(ETH_P_HDLC);
100
101         if (data->address != CISCO_MULTICAST &&
102             data->address != CISCO_UNICAST)
103                 return __constant_htons(ETH_P_HDLC);
104
105         switch(data->protocol) {
106         case __constant_htons(ETH_P_IP):
107         case __constant_htons(ETH_P_IPX):
108         case __constant_htons(ETH_P_IPV6):
109                 skb_pull(skb, sizeof(hdlc_header));
110                 return data->protocol;
111         default:
112                 return __constant_htons(ETH_P_HDLC);
113         }
114 }
115
116
117 static int cisco_rx(struct sk_buff *skb)
118 {
119         struct net_device *dev = skb->dev;
120         hdlc_device *hdlc = dev_to_hdlc(dev);
121         hdlc_header *data = (hdlc_header*)skb->data;
122         cisco_packet *cisco_data;
123         struct in_device *in_dev;
124         u32 addr, mask;
125
126         if (skb->len < sizeof(hdlc_header))
127                 goto rx_error;
128
129         if (data->address != CISCO_MULTICAST &&
130             data->address != CISCO_UNICAST)
131                 goto rx_error;
132
133         switch(ntohs(data->protocol)) {
134         case CISCO_SYS_INFO:
135                 /* Packet is not needed, drop it. */
136                 dev_kfree_skb_any(skb);
137                 return NET_RX_SUCCESS;
138
139         case CISCO_KEEPALIVE:
140                 if (skb->len != sizeof(hdlc_header) + CISCO_PACKET_LEN &&
141                     skb->len != sizeof(hdlc_header) + CISCO_BIG_PACKET_LEN) {
142                         printk(KERN_INFO "%s: Invalid length of Cisco "
143                                "control packet (%d bytes)\n",
144                                dev->name, skb->len);
145                         goto rx_error;
146                 }
147
148                 cisco_data = (cisco_packet*)(skb->data + sizeof(hdlc_header));
149
150                 switch(ntohl (cisco_data->type)) {
151                 case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
152                         in_dev = dev->ip_ptr;
153                         addr = 0;
154                         mask = ~0; /* is the mask correct? */
155
156                         if (in_dev != NULL) {
157                                 struct in_ifaddr **ifap = &in_dev->ifa_list;
158
159                                 while (*ifap != NULL) {
160                                         if (strcmp(dev->name,
161                                                    (*ifap)->ifa_label) == 0) {
162                                                 addr = (*ifap)->ifa_local;
163                                                 mask = (*ifap)->ifa_mask;
164                                                 break;
165                                         }
166                                         ifap = &(*ifap)->ifa_next;
167                                 }
168
169                                 cisco_keepalive_send(dev, CISCO_ADDR_REPLY,
170                                                      addr, mask);
171                         }
172                         dev_kfree_skb_any(skb);
173                         return NET_RX_SUCCESS;
174
175                 case CISCO_ADDR_REPLY:
176                         printk(KERN_INFO "%s: Unexpected Cisco IP address "
177                                "reply\n", dev->name);
178                         goto rx_error;
179
180                 case CISCO_KEEPALIVE_REQ:
181                         hdlc->state.cisco.rxseq = ntohl(cisco_data->par1);
182                         if (hdlc->state.cisco.request_sent &&
183                             ntohl(cisco_data->par2)==hdlc->state.cisco.txseq) {
184                                 hdlc->state.cisco.last_poll = jiffies;
185                                 if (!hdlc->state.cisco.up) {
186                                         u32 sec, min, hrs, days;
187                                         sec = ntohl(cisco_data->time) / 1000;
188                                         min = sec / 60; sec -= min * 60;
189                                         hrs = min / 60; min -= hrs * 60;
190                                         days = hrs / 24; hrs -= days * 24;
191                                         printk(KERN_INFO "%s: Link up (peer "
192                                                "uptime %ud%uh%um%us)\n",
193                                                dev->name, days, hrs,
194                                                min, sec);
195 #if 0
196                                         netif_carrier_on(dev);
197 #endif
198                                         hdlc->state.cisco.up = 1;
199                                 }
200                         }
201
202                         dev_kfree_skb_any(skb);
203                         return NET_RX_SUCCESS;
204                 } /* switch(keepalive type) */
205         } /* switch(protocol) */
206
207         printk(KERN_INFO "%s: Unsupported protocol %x\n", dev->name,
208                data->protocol);
209         dev_kfree_skb_any(skb);
210         return NET_RX_DROP;
211
212  rx_error:
213         hdlc->stats.rx_errors++; /* Mark error */
214         dev_kfree_skb_any(skb);
215         return NET_RX_DROP;
216 }
217
218
219
220 static void cisco_timer(unsigned long arg)
221 {
222         struct net_device *dev = (struct net_device *)arg;
223         hdlc_device *hdlc = dev_to_hdlc(dev);
224
225         if (hdlc->state.cisco.up &&
226             time_after(jiffies, hdlc->state.cisco.last_poll +
227                        hdlc->state.cisco.settings.timeout * HZ)) {
228                 hdlc->state.cisco.up = 0;
229                 printk(KERN_INFO "%s: Link down\n", dev->name);
230 #if 0
231                 netif_carrier_off(dev);
232 #endif
233         }
234
235         cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ,
236                              ++hdlc->state.cisco.txseq,
237                              hdlc->state.cisco.rxseq);
238         hdlc->state.cisco.request_sent = 1;
239         hdlc->state.cisco.timer.expires = jiffies +
240                 hdlc->state.cisco.settings.interval * HZ;
241         hdlc->state.cisco.timer.function = cisco_timer;
242         hdlc->state.cisco.timer.data = arg;
243         add_timer(&hdlc->state.cisco.timer);
244 }
245
246
247
248 static void cisco_start(struct net_device *dev)
249 {
250         hdlc_device *hdlc = dev_to_hdlc(dev);
251         hdlc->state.cisco.up = 0;
252         hdlc->state.cisco.request_sent = 0;
253         hdlc->state.cisco.txseq = hdlc->state.cisco.rxseq = 0;
254
255         init_timer(&hdlc->state.cisco.timer);
256         hdlc->state.cisco.timer.expires = jiffies + HZ; /*First poll after 1s*/
257         hdlc->state.cisco.timer.function = cisco_timer;
258         hdlc->state.cisco.timer.data = (unsigned long)dev;
259         add_timer(&hdlc->state.cisco.timer);
260 }
261
262
263
264 static void cisco_stop(struct net_device *dev)
265 {
266         hdlc_device *hdlc = dev_to_hdlc(dev);
267         del_timer_sync(&hdlc->state.cisco.timer);
268 #if 0
269         if (netif_carrier_ok(dev))
270                 netif_carrier_off(dev);
271 #endif
272         hdlc->state.cisco.up = 0;
273         hdlc->state.cisco.request_sent = 0;
274 }
275
276
277
278 int hdlc_cisco_ioctl(struct net_device *dev, struct ifreq *ifr)
279 {
280         cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
281         const size_t size = sizeof(cisco_proto);
282         cisco_proto new_settings;
283         hdlc_device *hdlc = dev_to_hdlc(dev);
284         int result;
285
286         switch (ifr->ifr_settings.type) {
287         case IF_GET_PROTO:
288                 ifr->ifr_settings.type = IF_PROTO_CISCO;
289                 if (ifr->ifr_settings.size < size) {
290                         ifr->ifr_settings.size = size; /* data size wanted */
291                         return -ENOBUFS;
292                 }
293                 if (copy_to_user(cisco_s, &hdlc->state.cisco.settings, size))
294                         return -EFAULT;
295                 return 0;
296
297         case IF_PROTO_CISCO:
298                 if(!capable(CAP_NET_ADMIN))
299                         return -EPERM;
300
301                 if(dev->flags & IFF_UP)
302                         return -EBUSY;
303
304                 if (copy_from_user(&new_settings, cisco_s, size))
305                         return -EFAULT;
306
307                 if (new_settings.interval < 1 ||
308                     new_settings.timeout < 2)
309                         return -EINVAL;
310
311                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
312
313                 if (result)
314                         return result;
315
316                 hdlc_proto_detach(hdlc);
317                 memcpy(&hdlc->state.cisco.settings, &new_settings, size);
318                 memset(&hdlc->proto, 0, sizeof(hdlc->proto));
319
320                 hdlc->proto.start = cisco_start;
321                 hdlc->proto.stop = cisco_stop;
322                 hdlc->proto.netif_rx = cisco_rx;
323                 hdlc->proto.type_trans = cisco_type_trans;
324                 hdlc->proto.id = IF_PROTO_CISCO;
325                 dev->hard_start_xmit = hdlc->xmit;
326                 dev->hard_header = cisco_hard_header;
327                 dev->hard_header_cache = NULL;
328                 dev->type = ARPHRD_CISCO;
329                 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
330                 dev->addr_len = 0;
331                 return 0;
332         }
333
334         return -EINVAL;
335 }