Commit | Line | Data |
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1da177e4 LT |
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); | |
689be439 | 75 | data = (cisco_packet*)skb->data; |
1da177e4 LT |
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 | } |