Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $ | |
3 | * | |
4 | * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or | |
5 | * user-supplied information to configure own IP address and routes. | |
6 | * | |
7 | * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> | |
8 | * | |
9 | * Derived from network configuration code in fs/nfs/nfsroot.c, | |
10 | * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. | |
11 | * | |
12 | * BOOTP rewritten to construct and analyse packets itself instead | |
13 | * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; | |
14 | * -- MJ, December 1998 | |
e905a9ed | 15 | * |
1da177e4 LT |
16 | * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" |
17 | * initialization scheme. | |
18 | * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 | |
19 | * | |
20 | * DHCP support added. To users this looks like a whole separate | |
21 | * protocol, but we know it's just a bag on the side of BOOTP. | |
22 | * -- Chip Salzenberg <chip@valinux.com>, May 2000 | |
23 | * | |
24 | * Ported DHCP support from 2.2.16 to 2.4.0-test4 | |
25 | * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 | |
26 | * | |
27 | * Merged changes from 2.2.19 into 2.4.3 | |
28 | * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 | |
29 | * | |
30 | * Multiple Nameservers in /proc/net/pnp | |
31 | * -- Josef Siemes <jsiemes@web.de>, Aug 2002 | |
32 | */ | |
33 | ||
1da177e4 LT |
34 | #include <linux/types.h> |
35 | #include <linux/string.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/jiffies.h> | |
38 | #include <linux/random.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/utsname.h> | |
41 | #include <linux/in.h> | |
42 | #include <linux/if.h> | |
43 | #include <linux/inet.h> | |
14c85021 | 44 | #include <linux/inetdevice.h> |
1da177e4 LT |
45 | #include <linux/netdevice.h> |
46 | #include <linux/if_arp.h> | |
47 | #include <linux/skbuff.h> | |
48 | #include <linux/ip.h> | |
49 | #include <linux/socket.h> | |
50 | #include <linux/route.h> | |
51 | #include <linux/udp.h> | |
52 | #include <linux/proc_fs.h> | |
53 | #include <linux/seq_file.h> | |
54 | #include <linux/major.h> | |
55 | #include <linux/root_dev.h> | |
56 | #include <linux/delay.h> | |
43d60661 | 57 | #include <linux/nfs_fs.h> |
457c4cbc | 58 | #include <net/net_namespace.h> |
1da177e4 LT |
59 | #include <net/arp.h> |
60 | #include <net/ip.h> | |
61 | #include <net/ipconfig.h> | |
14c85021 | 62 | #include <net/route.h> |
1da177e4 LT |
63 | |
64 | #include <asm/uaccess.h> | |
65 | #include <net/checksum.h> | |
66 | #include <asm/processor.h> | |
67 | ||
68 | /* Define this to allow debugging output */ | |
69 | #undef IPCONFIG_DEBUG | |
70 | ||
71 | #ifdef IPCONFIG_DEBUG | |
72 | #define DBG(x) printk x | |
73 | #else | |
74 | #define DBG(x) do { } while(0) | |
75 | #endif | |
76 | ||
77 | #if defined(CONFIG_IP_PNP_DHCP) | |
78 | #define IPCONFIG_DHCP | |
79 | #endif | |
80 | #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) | |
81 | #define IPCONFIG_BOOTP | |
82 | #endif | |
83 | #if defined(CONFIG_IP_PNP_RARP) | |
84 | #define IPCONFIG_RARP | |
85 | #endif | |
86 | #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) | |
87 | #define IPCONFIG_DYNAMIC | |
88 | #endif | |
89 | ||
90 | /* Define the friendly delay before and after opening net devices */ | |
91 | #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */ | |
92 | #define CONF_POST_OPEN 1 /* After opening: 1 second */ | |
93 | ||
94 | /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ | |
95 | #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ | |
96 | #define CONF_SEND_RETRIES 6 /* Send six requests per open */ | |
97 | #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ | |
98 | #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ | |
99 | #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ | |
100 | #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ | |
101 | #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ | |
e905a9ed YH |
102 | #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers |
103 | - '3' from resolv.h */ | |
1da177e4 | 104 | |
5a874db4 | 105 | #define NONE __constant_htonl(INADDR_NONE) |
e6f1cebf | 106 | #define ANY __constant_htonl(INADDR_ANY) |
1da177e4 LT |
107 | |
108 | /* | |
109 | * Public IP configuration | |
110 | */ | |
111 | ||
112 | /* This is used by platforms which might be able to set the ipconfig | |
113 | * variables using firmware environment vars. If this is set, it will | |
114 | * ignore such firmware variables. | |
115 | */ | |
116 | int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ | |
117 | ||
118 | static int ic_enable __initdata = 0; /* IP config enabled? */ | |
119 | ||
120 | /* Protocol choice */ | |
121 | int ic_proto_enabled __initdata = 0 | |
122 | #ifdef IPCONFIG_BOOTP | |
123 | | IC_BOOTP | |
124 | #endif | |
125 | #ifdef CONFIG_IP_PNP_DHCP | |
126 | | IC_USE_DHCP | |
127 | #endif | |
128 | #ifdef IPCONFIG_RARP | |
129 | | IC_RARP | |
130 | #endif | |
131 | ; | |
132 | ||
133 | static int ic_host_name_set __initdata = 0; /* Host name set by us? */ | |
134 | ||
5a874db4 AV |
135 | __be32 ic_myaddr = NONE; /* My IP address */ |
136 | static __be32 ic_netmask = NONE; /* Netmask for local subnet */ | |
137 | __be32 ic_gateway = NONE; /* Gateway IP address */ | |
1da177e4 | 138 | |
5a874db4 | 139 | __be32 ic_servaddr = NONE; /* Boot server IP address */ |
1da177e4 | 140 | |
5a874db4 | 141 | __be32 root_server_addr = NONE; /* Address of NFS server */ |
1da177e4 LT |
142 | u8 root_server_path[256] = { 0, }; /* Path to mount as root */ |
143 | ||
1b0b04f9 DM |
144 | /* vendor class identifier */ |
145 | static char vendor_class_identifier[253] __initdata; | |
62013dbb | 146 | |
1da177e4 LT |
147 | /* Persistent data: */ |
148 | ||
149 | static int ic_proto_used; /* Protocol used, if any */ | |
5a874db4 | 150 | static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ |
1da177e4 LT |
151 | static u8 ic_domain[64]; /* DNS (not NIS) domain name */ |
152 | ||
153 | /* | |
154 | * Private state. | |
155 | */ | |
156 | ||
157 | /* Name of user-selected boot device */ | |
158 | static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; | |
159 | ||
160 | /* Protocols supported by available interfaces */ | |
161 | static int ic_proto_have_if __initdata = 0; | |
162 | ||
163 | #ifdef IPCONFIG_DYNAMIC | |
164 | static DEFINE_SPINLOCK(ic_recv_lock); | |
165 | static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ | |
166 | #endif | |
167 | #ifdef IPCONFIG_DHCP | |
168 | static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ | |
169 | #endif | |
170 | ||
171 | ||
172 | /* | |
173 | * Network devices | |
174 | */ | |
175 | ||
176 | struct ic_device { | |
177 | struct ic_device *next; | |
178 | struct net_device *dev; | |
179 | unsigned short flags; | |
180 | short able; | |
5a874db4 | 181 | __be32 xid; |
1da177e4 LT |
182 | }; |
183 | ||
184 | static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ | |
185 | static struct net_device *ic_dev __initdata = NULL; /* Selected device */ | |
186 | ||
187 | static int __init ic_open_devs(void) | |
188 | { | |
189 | struct ic_device *d, **last; | |
190 | struct net_device *dev; | |
191 | unsigned short oflags; | |
192 | ||
193 | last = &ic_first_dev; | |
6756ae4b | 194 | rtnl_lock(); |
1da177e4 LT |
195 | |
196 | /* bring loopback device up first */ | |
0cc217e1 EB |
197 | for_each_netdev(&init_net, dev) { |
198 | if (!(dev->flags & IFF_LOOPBACK)) | |
199 | continue; | |
200 | if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) | |
201 | printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); | |
202 | } | |
1da177e4 | 203 | |
881d966b | 204 | for_each_netdev(&init_net, dev) { |
0cc217e1 | 205 | if (dev->flags & IFF_LOOPBACK) |
1da177e4 LT |
206 | continue; |
207 | if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : | |
208 | (!(dev->flags & IFF_LOOPBACK) && | |
209 | (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && | |
210 | strncmp(dev->name, "dummy", 5))) { | |
211 | int able = 0; | |
212 | if (dev->mtu >= 364) | |
213 | able |= IC_BOOTP; | |
214 | else | |
215 | printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); | |
216 | if (!(dev->flags & IFF_NOARP)) | |
217 | able |= IC_RARP; | |
218 | able &= ic_proto_enabled; | |
219 | if (ic_proto_enabled && !able) | |
220 | continue; | |
221 | oflags = dev->flags; | |
222 | if (dev_change_flags(dev, oflags | IFF_UP) < 0) { | |
223 | printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); | |
224 | continue; | |
225 | } | |
226 | if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { | |
6756ae4b | 227 | rtnl_unlock(); |
1da177e4 LT |
228 | return -1; |
229 | } | |
230 | d->dev = dev; | |
231 | *last = d; | |
232 | last = &d->next; | |
233 | d->flags = oflags; | |
234 | d->able = able; | |
235 | if (able & IC_BOOTP) | |
5a874db4 | 236 | get_random_bytes(&d->xid, sizeof(__be32)); |
1da177e4 LT |
237 | else |
238 | d->xid = 0; | |
239 | ic_proto_have_if |= able; | |
240 | DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", | |
241 | dev->name, able, d->xid)); | |
242 | } | |
243 | } | |
6756ae4b | 244 | rtnl_unlock(); |
1da177e4 LT |
245 | |
246 | *last = NULL; | |
247 | ||
248 | if (!ic_first_dev) { | |
249 | if (user_dev_name[0]) | |
250 | printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); | |
251 | else | |
252 | printk(KERN_ERR "IP-Config: No network devices available.\n"); | |
253 | return -1; | |
254 | } | |
255 | return 0; | |
256 | } | |
257 | ||
258 | static void __init ic_close_devs(void) | |
259 | { | |
260 | struct ic_device *d, *next; | |
261 | struct net_device *dev; | |
262 | ||
6756ae4b | 263 | rtnl_lock(); |
1da177e4 LT |
264 | next = ic_first_dev; |
265 | while ((d = next)) { | |
266 | next = d->next; | |
267 | dev = d->dev; | |
268 | if (dev != ic_dev) { | |
269 | DBG(("IP-Config: Downing %s\n", dev->name)); | |
270 | dev_change_flags(dev, d->flags); | |
271 | } | |
272 | kfree(d); | |
273 | } | |
6756ae4b | 274 | rtnl_unlock(); |
1da177e4 LT |
275 | } |
276 | ||
277 | /* | |
278 | * Interface to various network functions. | |
279 | */ | |
280 | ||
281 | static inline void | |
5a874db4 | 282 | set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) |
1da177e4 LT |
283 | { |
284 | sin->sin_family = AF_INET; | |
285 | sin->sin_addr.s_addr = addr; | |
286 | sin->sin_port = port; | |
287 | } | |
288 | ||
289 | static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) | |
290 | { | |
291 | int res; | |
292 | ||
293 | mm_segment_t oldfs = get_fs(); | |
294 | set_fs(get_ds()); | |
e5b13cb1 | 295 | res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); |
1da177e4 LT |
296 | set_fs(oldfs); |
297 | return res; | |
298 | } | |
299 | ||
300 | static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) | |
301 | { | |
302 | int res; | |
303 | ||
304 | mm_segment_t oldfs = get_fs(); | |
305 | set_fs(get_ds()); | |
1bad118a | 306 | res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); |
1da177e4 LT |
307 | set_fs(oldfs); |
308 | return res; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Set up interface addresses and routes. | |
313 | */ | |
314 | ||
315 | static int __init ic_setup_if(void) | |
316 | { | |
317 | struct ifreq ir; | |
318 | struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; | |
319 | int err; | |
320 | ||
321 | memset(&ir, 0, sizeof(ir)); | |
322 | strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); | |
323 | set_sockaddr(sin, ic_myaddr, 0); | |
324 | if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) { | |
325 | printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); | |
326 | return -1; | |
327 | } | |
328 | set_sockaddr(sin, ic_netmask, 0); | |
329 | if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) { | |
330 | printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); | |
331 | return -1; | |
332 | } | |
333 | set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); | |
334 | if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { | |
335 | printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); | |
336 | return -1; | |
337 | } | |
338 | return 0; | |
339 | } | |
340 | ||
341 | static int __init ic_setup_routes(void) | |
342 | { | |
343 | /* No need to setup device routes, only the default route... */ | |
344 | ||
5a874db4 | 345 | if (ic_gateway != NONE) { |
1da177e4 LT |
346 | struct rtentry rm; |
347 | int err; | |
348 | ||
349 | memset(&rm, 0, sizeof(rm)); | |
350 | if ((ic_gateway ^ ic_myaddr) & ic_netmask) { | |
351 | printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); | |
352 | return -1; | |
353 | } | |
354 | set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); | |
355 | set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); | |
356 | set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); | |
357 | rm.rt_flags = RTF_UP | RTF_GATEWAY; | |
358 | if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { | |
359 | printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); | |
360 | return -1; | |
361 | } | |
362 | } | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Fill in default values for all missing parameters. | |
369 | */ | |
370 | ||
371 | static int __init ic_defaults(void) | |
372 | { | |
373 | /* | |
374 | * At this point we have no userspace running so need not | |
375 | * claim locks on system_utsname | |
376 | */ | |
e905a9ed | 377 | |
1da177e4 | 378 | if (!ic_host_name_set) |
a7d632b6 | 379 | sprintf(init_utsname()->nodename, NIPQUAD_FMT, NIPQUAD(ic_myaddr)); |
1da177e4 | 380 | |
5a874db4 | 381 | if (root_server_addr == NONE) |
1da177e4 LT |
382 | root_server_addr = ic_servaddr; |
383 | ||
5a874db4 | 384 | if (ic_netmask == NONE) { |
1da177e4 LT |
385 | if (IN_CLASSA(ntohl(ic_myaddr))) |
386 | ic_netmask = htonl(IN_CLASSA_NET); | |
387 | else if (IN_CLASSB(ntohl(ic_myaddr))) | |
388 | ic_netmask = htonl(IN_CLASSB_NET); | |
389 | else if (IN_CLASSC(ntohl(ic_myaddr))) | |
390 | ic_netmask = htonl(IN_CLASSC_NET); | |
391 | else { | |
a7d632b6 | 392 | printk(KERN_ERR "IP-Config: Unable to guess netmask for address " NIPQUAD_FMT "\n", |
1da177e4 LT |
393 | NIPQUAD(ic_myaddr)); |
394 | return -1; | |
395 | } | |
a7d632b6 | 396 | printk("IP-Config: Guessing netmask " NIPQUAD_FMT "\n", NIPQUAD(ic_netmask)); |
1da177e4 LT |
397 | } |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | /* | |
403 | * RARP support. | |
404 | */ | |
405 | ||
406 | #ifdef IPCONFIG_RARP | |
407 | ||
f2ccd8fa | 408 | static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
409 | |
410 | static struct packet_type rarp_packet_type __initdata = { | |
411 | .type = __constant_htons(ETH_P_RARP), | |
412 | .func = ic_rarp_recv, | |
413 | }; | |
414 | ||
45e741b8 | 415 | static inline void __init ic_rarp_init(void) |
1da177e4 LT |
416 | { |
417 | dev_add_pack(&rarp_packet_type); | |
418 | } | |
419 | ||
45e741b8 | 420 | static inline void __init ic_rarp_cleanup(void) |
1da177e4 LT |
421 | { |
422 | dev_remove_pack(&rarp_packet_type); | |
423 | } | |
424 | ||
425 | /* | |
426 | * Process received RARP packet. | |
427 | */ | |
428 | static int __init | |
f2ccd8fa | 429 | ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
430 | { |
431 | struct arphdr *rarp; | |
432 | unsigned char *rarp_ptr; | |
5a874db4 | 433 | __be32 sip, tip; |
1da177e4 LT |
434 | unsigned char *sha, *tha; /* s for "source", t for "target" */ |
435 | struct ic_device *d; | |
436 | ||
c346dca1 | 437 | if (dev_net(dev) != &init_net) |
e730c155 EB |
438 | goto drop; |
439 | ||
1da177e4 LT |
440 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
441 | return NET_RX_DROP; | |
442 | ||
443 | if (!pskb_may_pull(skb, sizeof(struct arphdr))) | |
444 | goto drop; | |
445 | ||
446 | /* Basic sanity checks can be done without the lock. */ | |
9c70220b | 447 | rarp = (struct arphdr *)skb_transport_header(skb); |
1da177e4 LT |
448 | |
449 | /* If this test doesn't pass, it's not IP, or we should | |
450 | * ignore it anyway. | |
451 | */ | |
452 | if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) | |
453 | goto drop; | |
454 | ||
455 | /* If it's not a RARP reply, delete it. */ | |
456 | if (rarp->ar_op != htons(ARPOP_RREPLY)) | |
457 | goto drop; | |
458 | ||
459 | /* If it's not Ethernet, delete it. */ | |
460 | if (rarp->ar_pro != htons(ETH_P_IP)) | |
461 | goto drop; | |
462 | ||
988b7050 | 463 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) |
1da177e4 LT |
464 | goto drop; |
465 | ||
466 | /* OK, it is all there and looks valid, process... */ | |
9c70220b | 467 | rarp = (struct arphdr *)skb_transport_header(skb); |
1da177e4 LT |
468 | rarp_ptr = (unsigned char *) (rarp + 1); |
469 | ||
470 | /* One reply at a time, please. */ | |
471 | spin_lock(&ic_recv_lock); | |
472 | ||
473 | /* If we already have a reply, just drop the packet */ | |
474 | if (ic_got_reply) | |
475 | goto drop_unlock; | |
476 | ||
477 | /* Find the ic_device that the packet arrived on */ | |
478 | d = ic_first_dev; | |
479 | while (d && d->dev != dev) | |
480 | d = d->next; | |
481 | if (!d) | |
482 | goto drop_unlock; /* should never happen */ | |
483 | ||
484 | /* Extract variable-width fields */ | |
485 | sha = rarp_ptr; | |
486 | rarp_ptr += dev->addr_len; | |
487 | memcpy(&sip, rarp_ptr, 4); | |
488 | rarp_ptr += 4; | |
489 | tha = rarp_ptr; | |
490 | rarp_ptr += dev->addr_len; | |
491 | memcpy(&tip, rarp_ptr, 4); | |
492 | ||
493 | /* Discard packets which are not meant for us. */ | |
494 | if (memcmp(tha, dev->dev_addr, dev->addr_len)) | |
495 | goto drop_unlock; | |
496 | ||
497 | /* Discard packets which are not from specified server. */ | |
5a874db4 | 498 | if (ic_servaddr != NONE && ic_servaddr != sip) |
1da177e4 LT |
499 | goto drop_unlock; |
500 | ||
501 | /* We have a winner! */ | |
502 | ic_dev = dev; | |
5a874db4 | 503 | if (ic_myaddr == NONE) |
1da177e4 LT |
504 | ic_myaddr = tip; |
505 | ic_servaddr = sip; | |
506 | ic_got_reply = IC_RARP; | |
507 | ||
508 | drop_unlock: | |
509 | /* Show's over. Nothing to see here. */ | |
510 | spin_unlock(&ic_recv_lock); | |
511 | ||
512 | drop: | |
513 | /* Throw the packet out. */ | |
514 | kfree_skb(skb); | |
515 | return 0; | |
516 | } | |
517 | ||
518 | ||
519 | /* | |
520 | * Send RARP request packet over a single interface. | |
521 | */ | |
522 | static void __init ic_rarp_send_if(struct ic_device *d) | |
523 | { | |
524 | struct net_device *dev = d->dev; | |
525 | arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, | |
526 | dev->dev_addr, dev->dev_addr); | |
527 | } | |
528 | #endif | |
529 | ||
530 | /* | |
531 | * DHCP/BOOTP support. | |
532 | */ | |
533 | ||
534 | #ifdef IPCONFIG_BOOTP | |
535 | ||
536 | struct bootp_pkt { /* BOOTP packet format */ | |
537 | struct iphdr iph; /* IP header */ | |
538 | struct udphdr udph; /* UDP header */ | |
539 | u8 op; /* 1=request, 2=reply */ | |
540 | u8 htype; /* HW address type */ | |
541 | u8 hlen; /* HW address length */ | |
542 | u8 hops; /* Used only by gateways */ | |
5a874db4 AV |
543 | __be32 xid; /* Transaction ID */ |
544 | __be16 secs; /* Seconds since we started */ | |
545 | __be16 flags; /* Just what it says */ | |
546 | __be32 client_ip; /* Client's IP address if known */ | |
547 | __be32 your_ip; /* Assigned IP address */ | |
548 | __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ | |
549 | __be32 relay_ip; /* IP address of BOOTP relay */ | |
1da177e4 LT |
550 | u8 hw_addr[16]; /* Client's HW address */ |
551 | u8 serv_name[64]; /* Server host name */ | |
552 | u8 boot_file[128]; /* Name of boot file */ | |
553 | u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ | |
554 | }; | |
555 | ||
556 | /* packet ops */ | |
557 | #define BOOTP_REQUEST 1 | |
558 | #define BOOTP_REPLY 2 | |
559 | ||
560 | /* DHCP message types */ | |
561 | #define DHCPDISCOVER 1 | |
562 | #define DHCPOFFER 2 | |
563 | #define DHCPREQUEST 3 | |
564 | #define DHCPDECLINE 4 | |
565 | #define DHCPACK 5 | |
566 | #define DHCPNAK 6 | |
567 | #define DHCPRELEASE 7 | |
568 | #define DHCPINFORM 8 | |
569 | ||
f2ccd8fa | 570 | static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
571 | |
572 | static struct packet_type bootp_packet_type __initdata = { | |
573 | .type = __constant_htons(ETH_P_IP), | |
574 | .func = ic_bootp_recv, | |
575 | }; | |
576 | ||
577 | ||
578 | /* | |
579 | * Initialize DHCP/BOOTP extension fields in the request. | |
580 | */ | |
581 | ||
582 | static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; | |
583 | ||
584 | #ifdef IPCONFIG_DHCP | |
585 | ||
586 | static void __init | |
587 | ic_dhcp_init_options(u8 *options) | |
588 | { | |
5a874db4 | 589 | u8 mt = ((ic_servaddr == NONE) |
1da177e4 LT |
590 | ? DHCPDISCOVER : DHCPREQUEST); |
591 | u8 *e = options; | |
62013dbb | 592 | int len; |
1da177e4 LT |
593 | |
594 | #ifdef IPCONFIG_DEBUG | |
595 | printk("DHCP: Sending message type %d\n", mt); | |
596 | #endif | |
597 | ||
598 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ | |
599 | e += 4; | |
600 | ||
601 | *e++ = 53; /* DHCP message type */ | |
602 | *e++ = 1; | |
603 | *e++ = mt; | |
604 | ||
605 | if (mt == DHCPREQUEST) { | |
606 | *e++ = 54; /* Server ID (IP address) */ | |
607 | *e++ = 4; | |
608 | memcpy(e, &ic_servaddr, 4); | |
609 | e += 4; | |
610 | ||
611 | *e++ = 50; /* Requested IP address */ | |
612 | *e++ = 4; | |
613 | memcpy(e, &ic_myaddr, 4); | |
614 | e += 4; | |
615 | } | |
616 | ||
617 | /* always? */ | |
618 | { | |
619 | static const u8 ic_req_params[] = { | |
620 | 1, /* Subnet mask */ | |
621 | 3, /* Default gateway */ | |
622 | 6, /* DNS server */ | |
623 | 12, /* Host name */ | |
624 | 15, /* Domain name */ | |
625 | 17, /* Boot path */ | |
626 | 40, /* NIS domain name */ | |
627 | }; | |
628 | ||
629 | *e++ = 55; /* Parameter request list */ | |
630 | *e++ = sizeof(ic_req_params); | |
631 | memcpy(e, ic_req_params, sizeof(ic_req_params)); | |
632 | e += sizeof(ic_req_params); | |
62013dbb RJ |
633 | |
634 | if (*vendor_class_identifier) { | |
635 | printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", | |
636 | vendor_class_identifier); | |
637 | *e++ = 60; /* Class-identifier */ | |
638 | len = strlen(vendor_class_identifier); | |
639 | *e++ = len; | |
640 | memcpy(e, vendor_class_identifier, len); | |
641 | e += len; | |
642 | } | |
1da177e4 LT |
643 | } |
644 | ||
645 | *e++ = 255; /* End of the list */ | |
646 | } | |
647 | ||
648 | #endif /* IPCONFIG_DHCP */ | |
649 | ||
650 | static void __init ic_bootp_init_ext(u8 *e) | |
651 | { | |
652 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ | |
653 | e += 4; | |
654 | *e++ = 1; /* Subnet mask request */ | |
655 | *e++ = 4; | |
656 | e += 4; | |
657 | *e++ = 3; /* Default gateway request */ | |
658 | *e++ = 4; | |
659 | e += 4; | |
660 | *e++ = 5; /* Name server request */ | |
661 | *e++ = 8; | |
662 | e += 8; | |
663 | *e++ = 12; /* Host name request */ | |
664 | *e++ = 32; | |
665 | e += 32; | |
666 | *e++ = 40; /* NIS Domain name request */ | |
667 | *e++ = 32; | |
668 | e += 32; | |
669 | *e++ = 17; /* Boot path */ | |
670 | *e++ = 40; | |
671 | e += 40; | |
672 | ||
e905a9ed | 673 | *e++ = 57; /* set extension buffer size for reply */ |
1da177e4 | 674 | *e++ = 2; |
e905a9ed | 675 | *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ |
1da177e4 LT |
676 | *e++ = 150; |
677 | ||
678 | *e++ = 255; /* End of the list */ | |
679 | } | |
680 | ||
681 | ||
682 | /* | |
683 | * Initialize the DHCP/BOOTP mechanism. | |
684 | */ | |
45e741b8 | 685 | static inline void __init ic_bootp_init(void) |
1da177e4 LT |
686 | { |
687 | int i; | |
688 | ||
689 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) | |
5a874db4 | 690 | ic_nameservers[i] = NONE; |
1da177e4 LT |
691 | |
692 | dev_add_pack(&bootp_packet_type); | |
693 | } | |
694 | ||
695 | ||
696 | /* | |
697 | * DHCP/BOOTP cleanup. | |
698 | */ | |
45e741b8 | 699 | static inline void __init ic_bootp_cleanup(void) |
1da177e4 LT |
700 | { |
701 | dev_remove_pack(&bootp_packet_type); | |
702 | } | |
703 | ||
704 | ||
705 | /* | |
706 | * Send DHCP/BOOTP request to single interface. | |
707 | */ | |
708 | static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) | |
709 | { | |
710 | struct net_device *dev = d->dev; | |
711 | struct sk_buff *skb; | |
712 | struct bootp_pkt *b; | |
713 | int hh_len = LL_RESERVED_SPACE(dev); | |
714 | struct iphdr *h; | |
715 | ||
716 | /* Allocate packet */ | |
717 | skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL); | |
718 | if (!skb) | |
719 | return; | |
720 | skb_reserve(skb, hh_len); | |
721 | b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); | |
722 | memset(b, 0, sizeof(struct bootp_pkt)); | |
723 | ||
724 | /* Construct IP header */ | |
04b964db | 725 | skb_reset_network_header(skb); |
eddc9ec5 | 726 | h = ip_hdr(skb); |
1da177e4 LT |
727 | h->version = 4; |
728 | h->ihl = 5; | |
729 | h->tot_len = htons(sizeof(struct bootp_pkt)); | |
730 | h->frag_off = htons(IP_DF); | |
731 | h->ttl = 64; | |
732 | h->protocol = IPPROTO_UDP; | |
5a874db4 | 733 | h->daddr = htonl(INADDR_BROADCAST); |
1da177e4 LT |
734 | h->check = ip_fast_csum((unsigned char *) h, h->ihl); |
735 | ||
736 | /* Construct UDP header */ | |
737 | b->udph.source = htons(68); | |
738 | b->udph.dest = htons(67); | |
739 | b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); | |
740 | /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ | |
741 | ||
742 | /* Construct DHCP/BOOTP header */ | |
743 | b->op = BOOTP_REQUEST; | |
744 | if (dev->type < 256) /* check for false types */ | |
745 | b->htype = dev->type; | |
746 | else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ | |
747 | b->htype = ARPHRD_IEEE802; | |
748 | else if (dev->type == ARPHRD_FDDI) | |
749 | b->htype = ARPHRD_ETHER; | |
750 | else { | |
751 | printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); | |
752 | b->htype = dev->type; /* can cause undefined behavior */ | |
753 | } | |
dea75bdf SH |
754 | |
755 | /* server_ip and your_ip address are both already zero per RFC2131 */ | |
1da177e4 | 756 | b->hlen = dev->addr_len; |
1da177e4 LT |
757 | memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); |
758 | b->secs = htons(jiffies_diff / HZ); | |
759 | b->xid = d->xid; | |
760 | ||
761 | /* add DHCP options or BOOTP extensions */ | |
762 | #ifdef IPCONFIG_DHCP | |
763 | if (ic_proto_enabled & IC_USE_DHCP) | |
764 | ic_dhcp_init_options(b->exten); | |
765 | else | |
766 | #endif | |
767 | ic_bootp_init_ext(b->exten); | |
768 | ||
769 | /* Chain packet down the line... */ | |
770 | skb->dev = dev; | |
771 | skb->protocol = htons(ETH_P_IP); | |
0c4e8581 SH |
772 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), |
773 | dev->broadcast, dev->dev_addr, skb->len) < 0 || | |
1da177e4 LT |
774 | dev_queue_xmit(skb) < 0) |
775 | printk("E"); | |
776 | } | |
777 | ||
778 | ||
779 | /* | |
780 | * Copy BOOTP-supplied string if not already set. | |
781 | */ | |
782 | static int __init ic_bootp_string(char *dest, char *src, int len, int max) | |
783 | { | |
784 | if (!len) | |
785 | return 0; | |
786 | if (len > max-1) | |
787 | len = max-1; | |
788 | memcpy(dest, src, len); | |
789 | dest[len] = '\0'; | |
790 | return 1; | |
791 | } | |
792 | ||
793 | ||
794 | /* | |
795 | * Process BOOTP extensions. | |
796 | */ | |
797 | static void __init ic_do_bootp_ext(u8 *ext) | |
798 | { | |
799 | u8 servers; | |
800 | int i; | |
801 | ||
802 | #ifdef IPCONFIG_DEBUG | |
803 | u8 *c; | |
804 | ||
805 | printk("DHCP/BOOTP: Got extension %d:",*ext); | |
132adf54 | 806 | for (c=ext+2; c<ext+2+ext[1]; c++) |
1da177e4 LT |
807 | printk(" %02x", *c); |
808 | printk("\n"); | |
809 | #endif | |
810 | ||
811 | switch (*ext++) { | |
812 | case 1: /* Subnet mask */ | |
5a874db4 | 813 | if (ic_netmask == NONE) |
1da177e4 LT |
814 | memcpy(&ic_netmask, ext+1, 4); |
815 | break; | |
816 | case 3: /* Default gateway */ | |
5a874db4 | 817 | if (ic_gateway == NONE) |
1da177e4 LT |
818 | memcpy(&ic_gateway, ext+1, 4); |
819 | break; | |
820 | case 6: /* DNS server */ | |
821 | servers= *ext/4; | |
822 | if (servers > CONF_NAMESERVERS_MAX) | |
823 | servers = CONF_NAMESERVERS_MAX; | |
824 | for (i = 0; i < servers; i++) { | |
5a874db4 | 825 | if (ic_nameservers[i] == NONE) |
1da177e4 LT |
826 | memcpy(&ic_nameservers[i], ext+1+4*i, 4); |
827 | } | |
828 | break; | |
829 | case 12: /* Host name */ | |
e9ff3990 | 830 | ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); |
1da177e4 LT |
831 | ic_host_name_set = 1; |
832 | break; | |
833 | case 15: /* Domain name (DNS) */ | |
834 | ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); | |
835 | break; | |
836 | case 17: /* Root path */ | |
837 | if (!root_server_path[0]) | |
838 | ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); | |
839 | break; | |
840 | case 40: /* NIS Domain name (_not_ DNS) */ | |
e9ff3990 | 841 | ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); |
1da177e4 LT |
842 | break; |
843 | } | |
844 | } | |
845 | ||
846 | ||
847 | /* | |
848 | * Receive BOOTP reply. | |
849 | */ | |
f2ccd8fa | 850 | static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
851 | { |
852 | struct bootp_pkt *b; | |
853 | struct iphdr *h; | |
854 | struct ic_device *d; | |
855 | int len, ext_len; | |
856 | ||
c346dca1 | 857 | if (dev_net(dev) != &init_net) |
e730c155 EB |
858 | goto drop; |
859 | ||
1da177e4 LT |
860 | /* Perform verifications before taking the lock. */ |
861 | if (skb->pkt_type == PACKET_OTHERHOST) | |
862 | goto drop; | |
863 | ||
864 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
865 | return NET_RX_DROP; | |
866 | ||
867 | if (!pskb_may_pull(skb, | |
868 | sizeof(struct iphdr) + | |
869 | sizeof(struct udphdr))) | |
870 | goto drop; | |
871 | ||
eddc9ec5 | 872 | b = (struct bootp_pkt *)skb_network_header(skb); |
1da177e4 LT |
873 | h = &b->iph; |
874 | ||
875 | if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) | |
876 | goto drop; | |
877 | ||
878 | /* Fragments are not supported */ | |
879 | if (h->frag_off & htons(IP_OFFSET | IP_MF)) { | |
880 | if (net_ratelimit()) | |
881 | printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " | |
882 | "reply.\n"); | |
883 | goto drop; | |
884 | } | |
885 | ||
886 | if (skb->len < ntohs(h->tot_len)) | |
887 | goto drop; | |
888 | ||
889 | if (ip_fast_csum((char *) h, h->ihl)) | |
890 | goto drop; | |
891 | ||
892 | if (b->udph.source != htons(67) || b->udph.dest != htons(68)) | |
893 | goto drop; | |
894 | ||
895 | if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) | |
896 | goto drop; | |
897 | ||
898 | len = ntohs(b->udph.len) - sizeof(struct udphdr); | |
899 | ext_len = len - (sizeof(*b) - | |
900 | sizeof(struct iphdr) - | |
901 | sizeof(struct udphdr) - | |
902 | sizeof(b->exten)); | |
903 | if (ext_len < 0) | |
904 | goto drop; | |
905 | ||
906 | /* Ok the front looks good, make sure we can get at the rest. */ | |
907 | if (!pskb_may_pull(skb, skb->len)) | |
908 | goto drop; | |
909 | ||
eddc9ec5 | 910 | b = (struct bootp_pkt *)skb_network_header(skb); |
1da177e4 LT |
911 | h = &b->iph; |
912 | ||
913 | /* One reply at a time, please. */ | |
914 | spin_lock(&ic_recv_lock); | |
915 | ||
916 | /* If we already have a reply, just drop the packet */ | |
917 | if (ic_got_reply) | |
918 | goto drop_unlock; | |
919 | ||
920 | /* Find the ic_device that the packet arrived on */ | |
921 | d = ic_first_dev; | |
922 | while (d && d->dev != dev) | |
923 | d = d->next; | |
924 | if (!d) | |
925 | goto drop_unlock; /* should never happen */ | |
926 | ||
927 | /* Is it a reply to our BOOTP request? */ | |
928 | if (b->op != BOOTP_REPLY || | |
929 | b->xid != d->xid) { | |
930 | if (net_ratelimit()) | |
931 | printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " | |
932 | "op[%x] xid[%x]\n", | |
933 | b->op, b->xid); | |
934 | goto drop_unlock; | |
935 | } | |
936 | ||
937 | /* Parse extensions */ | |
938 | if (ext_len >= 4 && | |
939 | !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ | |
e905a9ed | 940 | u8 *end = (u8 *) b + ntohs(b->iph.tot_len); |
1da177e4 LT |
941 | u8 *ext; |
942 | ||
943 | #ifdef IPCONFIG_DHCP | |
944 | if (ic_proto_enabled & IC_USE_DHCP) { | |
5a874db4 | 945 | __be32 server_id = NONE; |
1da177e4 LT |
946 | int mt = 0; |
947 | ||
948 | ext = &b->exten[4]; | |
949 | while (ext < end && *ext != 0xff) { | |
950 | u8 *opt = ext++; | |
951 | if (*opt == 0) /* Padding */ | |
952 | continue; | |
953 | ext += *ext + 1; | |
954 | if (ext >= end) | |
955 | break; | |
956 | switch (*opt) { | |
957 | case 53: /* Message type */ | |
958 | if (opt[1]) | |
959 | mt = opt[2]; | |
960 | break; | |
961 | case 54: /* Server ID (IP address) */ | |
962 | if (opt[1] >= 4) | |
963 | memcpy(&server_id, opt + 2, 4); | |
964 | break; | |
3ff50b79 | 965 | } |
1da177e4 LT |
966 | } |
967 | ||
968 | #ifdef IPCONFIG_DEBUG | |
969 | printk("DHCP: Got message type %d\n", mt); | |
970 | #endif | |
971 | ||
972 | switch (mt) { | |
973 | case DHCPOFFER: | |
974 | /* While in the process of accepting one offer, | |
975 | * ignore all others. | |
976 | */ | |
5a874db4 | 977 | if (ic_myaddr != NONE) |
1da177e4 LT |
978 | goto drop_unlock; |
979 | ||
980 | /* Let's accept that offer. */ | |
981 | ic_myaddr = b->your_ip; | |
982 | ic_servaddr = server_id; | |
983 | #ifdef IPCONFIG_DEBUG | |
a7d632b6 | 984 | printk("DHCP: Offered address " NIPQUAD_FMT, |
1da177e4 | 985 | NIPQUAD(ic_myaddr)); |
a7d632b6 | 986 | printk(" by server " NIPQUAD_FMT "\n", |
1da177e4 LT |
987 | NIPQUAD(ic_servaddr)); |
988 | #endif | |
989 | /* The DHCP indicated server address takes | |
990 | * precedence over the bootp header one if | |
991 | * they are different. | |
992 | */ | |
5a874db4 | 993 | if ((server_id != NONE) && |
1da177e4 LT |
994 | (b->server_ip != server_id)) |
995 | b->server_ip = ic_servaddr; | |
996 | break; | |
997 | ||
998 | case DHCPACK: | |
999 | if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) | |
1000 | goto drop_unlock; | |
1001 | ||
1002 | /* Yeah! */ | |
1003 | break; | |
1004 | ||
1005 | default: | |
1006 | /* Urque. Forget it*/ | |
5a874db4 AV |
1007 | ic_myaddr = NONE; |
1008 | ic_servaddr = NONE; | |
1da177e4 | 1009 | goto drop_unlock; |
3ff50b79 | 1010 | } |
1da177e4 LT |
1011 | |
1012 | ic_dhcp_msgtype = mt; | |
1013 | ||
1014 | } | |
1015 | #endif /* IPCONFIG_DHCP */ | |
1016 | ||
1017 | ext = &b->exten[4]; | |
1018 | while (ext < end && *ext != 0xff) { | |
1019 | u8 *opt = ext++; | |
1020 | if (*opt == 0) /* Padding */ | |
1021 | continue; | |
1022 | ext += *ext + 1; | |
1023 | if (ext < end) | |
1024 | ic_do_bootp_ext(opt); | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | /* We have a winner! */ | |
1029 | ic_dev = dev; | |
1030 | ic_myaddr = b->your_ip; | |
1031 | ic_servaddr = b->server_ip; | |
5a874db4 | 1032 | if (ic_gateway == NONE && b->relay_ip) |
1da177e4 | 1033 | ic_gateway = b->relay_ip; |
5a874db4 | 1034 | if (ic_nameservers[0] == NONE) |
1da177e4 LT |
1035 | ic_nameservers[0] = ic_servaddr; |
1036 | ic_got_reply = IC_BOOTP; | |
1037 | ||
1038 | drop_unlock: | |
1039 | /* Show's over. Nothing to see here. */ | |
1040 | spin_unlock(&ic_recv_lock); | |
1041 | ||
1042 | drop: | |
1043 | /* Throw the packet out. */ | |
1044 | kfree_skb(skb); | |
1045 | ||
1046 | return 0; | |
e905a9ed | 1047 | } |
1da177e4 LT |
1048 | |
1049 | ||
1050 | #endif | |
1051 | ||
1052 | ||
1053 | /* | |
1054 | * Dynamic IP configuration -- DHCP, BOOTP, RARP. | |
1055 | */ | |
1056 | ||
1057 | #ifdef IPCONFIG_DYNAMIC | |
1058 | ||
1059 | static int __init ic_dynamic(void) | |
1060 | { | |
1061 | int retries; | |
1062 | struct ic_device *d; | |
1063 | unsigned long start_jiffies, timeout, jiff; | |
1064 | int do_bootp = ic_proto_have_if & IC_BOOTP; | |
1065 | int do_rarp = ic_proto_have_if & IC_RARP; | |
1066 | ||
1067 | /* | |
1068 | * If none of DHCP/BOOTP/RARP was selected, return with an error. | |
1069 | * This routine gets only called when some pieces of information | |
1070 | * are missing, and without DHCP/BOOTP/RARP we are unable to get it. | |
1071 | */ | |
1072 | if (!ic_proto_enabled) { | |
1073 | printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); | |
1074 | return -1; | |
1075 | } | |
1076 | ||
1077 | #ifdef IPCONFIG_BOOTP | |
1078 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) | |
1079 | printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); | |
1080 | #endif | |
1081 | #ifdef IPCONFIG_RARP | |
1082 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) | |
1083 | printk(KERN_ERR "RARP: No suitable device found.\n"); | |
1084 | #endif | |
1085 | ||
1086 | if (!ic_proto_have_if) | |
1087 | /* Error message already printed */ | |
1088 | return -1; | |
1089 | ||
1090 | /* | |
1091 | * Setup protocols | |
1092 | */ | |
1093 | #ifdef IPCONFIG_BOOTP | |
1094 | if (do_bootp) | |
1095 | ic_bootp_init(); | |
1096 | #endif | |
1097 | #ifdef IPCONFIG_RARP | |
1098 | if (do_rarp) | |
1099 | ic_rarp_init(); | |
1100 | #endif | |
1101 | ||
1102 | /* | |
1103 | * Send requests and wait, until we get an answer. This loop | |
1104 | * seems to be a terrible waste of CPU time, but actually there is | |
1105 | * only one process running at all, so we don't need to use any | |
1106 | * scheduler functions. | |
e905a9ed | 1107 | * [Actually we could now, but the nothing else running note still |
1da177e4 LT |
1108 | * applies.. - AC] |
1109 | */ | |
1110 | printk(KERN_NOTICE "Sending %s%s%s requests .", | |
1111 | do_bootp | |
1112 | ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", | |
1113 | (do_bootp && do_rarp) ? " and " : "", | |
1114 | do_rarp ? "RARP" : ""); | |
1115 | ||
1116 | start_jiffies = jiffies; | |
1117 | d = ic_first_dev; | |
1118 | retries = CONF_SEND_RETRIES; | |
1119 | get_random_bytes(&timeout, sizeof(timeout)); | |
1120 | timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); | |
132adf54 | 1121 | for (;;) { |
1da177e4 LT |
1122 | #ifdef IPCONFIG_BOOTP |
1123 | if (do_bootp && (d->able & IC_BOOTP)) | |
1124 | ic_bootp_send_if(d, jiffies - start_jiffies); | |
1125 | #endif | |
1126 | #ifdef IPCONFIG_RARP | |
1127 | if (do_rarp && (d->able & IC_RARP)) | |
1128 | ic_rarp_send_if(d); | |
1129 | #endif | |
1130 | ||
1131 | jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); | |
121caf57 NA |
1132 | while (time_before(jiffies, jiff) && !ic_got_reply) |
1133 | schedule_timeout_uninterruptible(1); | |
1da177e4 LT |
1134 | #ifdef IPCONFIG_DHCP |
1135 | /* DHCP isn't done until we get a DHCPACK. */ | |
1136 | if ((ic_got_reply & IC_BOOTP) | |
1137 | && (ic_proto_enabled & IC_USE_DHCP) | |
1138 | && ic_dhcp_msgtype != DHCPACK) | |
1139 | { | |
1140 | ic_got_reply = 0; | |
1141 | printk(","); | |
1142 | continue; | |
1143 | } | |
1144 | #endif /* IPCONFIG_DHCP */ | |
1145 | ||
1146 | if (ic_got_reply) { | |
1147 | printk(" OK\n"); | |
1148 | break; | |
1149 | } | |
1150 | ||
1151 | if ((d = d->next)) | |
1152 | continue; | |
1153 | ||
1154 | if (! --retries) { | |
1155 | printk(" timed out!\n"); | |
1156 | break; | |
1157 | } | |
1158 | ||
1159 | d = ic_first_dev; | |
1160 | ||
1161 | timeout = timeout CONF_TIMEOUT_MULT; | |
1162 | if (timeout > CONF_TIMEOUT_MAX) | |
1163 | timeout = CONF_TIMEOUT_MAX; | |
1164 | ||
1165 | printk("."); | |
1166 | } | |
1167 | ||
1168 | #ifdef IPCONFIG_BOOTP | |
1169 | if (do_bootp) | |
1170 | ic_bootp_cleanup(); | |
1171 | #endif | |
1172 | #ifdef IPCONFIG_RARP | |
1173 | if (do_rarp) | |
1174 | ic_rarp_cleanup(); | |
1175 | #endif | |
1176 | ||
7a1af5d7 | 1177 | if (!ic_got_reply) { |
5a874db4 | 1178 | ic_myaddr = NONE; |
1da177e4 | 1179 | return -1; |
7a1af5d7 | 1180 | } |
1da177e4 | 1181 | |
a7d632b6 | 1182 | printk("IP-Config: Got %s answer from " NIPQUAD_FMT ", ", |
e905a9ed | 1183 | ((ic_got_reply & IC_RARP) ? "RARP" |
1da177e4 LT |
1184 | : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), |
1185 | NIPQUAD(ic_servaddr)); | |
a7d632b6 | 1186 | printk("my address is " NIPQUAD_FMT "\n", NIPQUAD(ic_myaddr)); |
1da177e4 LT |
1187 | |
1188 | return 0; | |
1189 | } | |
1190 | ||
1191 | #endif /* IPCONFIG_DYNAMIC */ | |
1192 | ||
1193 | #ifdef CONFIG_PROC_FS | |
1194 | ||
1195 | static int pnp_seq_show(struct seq_file *seq, void *v) | |
1196 | { | |
1197 | int i; | |
1198 | ||
1199 | if (ic_proto_used & IC_PROTO) | |
1200 | seq_printf(seq, "#PROTO: %s\n", | |
1201 | (ic_proto_used & IC_RARP) ? "RARP" | |
1202 | : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); | |
1203 | else | |
1204 | seq_puts(seq, "#MANUAL\n"); | |
1205 | ||
1206 | if (ic_domain[0]) | |
1207 | seq_printf(seq, | |
1208 | "domain %s\n", ic_domain); | |
1209 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { | |
5a874db4 | 1210 | if (ic_nameservers[i] != NONE) |
1da177e4 | 1211 | seq_printf(seq, |
a7d632b6 | 1212 | "nameserver " NIPQUAD_FMT "\n", |
1da177e4 LT |
1213 | NIPQUAD(ic_nameservers[i])); |
1214 | } | |
5a874db4 | 1215 | if (ic_servaddr != NONE) |
1da177e4 | 1216 | seq_printf(seq, |
a7d632b6 | 1217 | "bootserver " NIPQUAD_FMT "\n", |
1da177e4 LT |
1218 | NIPQUAD(ic_servaddr)); |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | static int pnp_seq_open(struct inode *indoe, struct file *file) | |
1223 | { | |
1224 | return single_open(file, pnp_seq_show, NULL); | |
1225 | } | |
1226 | ||
9a32144e | 1227 | static const struct file_operations pnp_seq_fops = { |
1da177e4 LT |
1228 | .owner = THIS_MODULE, |
1229 | .open = pnp_seq_open, | |
1230 | .read = seq_read, | |
1231 | .llseek = seq_lseek, | |
1232 | .release = single_release, | |
1233 | }; | |
1234 | #endif /* CONFIG_PROC_FS */ | |
1235 | ||
1236 | /* | |
1237 | * Extract IP address from the parameter string if needed. Note that we | |
1238 | * need to have root_server_addr set _before_ IPConfig gets called as it | |
1239 | * can override it. | |
1240 | */ | |
5a874db4 | 1241 | __be32 __init root_nfs_parse_addr(char *name) |
1da177e4 | 1242 | { |
5a874db4 | 1243 | __be32 addr; |
1da177e4 LT |
1244 | int octets = 0; |
1245 | char *cp, *cq; | |
1246 | ||
1247 | cp = cq = name; | |
1248 | while (octets < 4) { | |
1249 | while (*cp >= '0' && *cp <= '9') | |
1250 | cp++; | |
1251 | if (cp == cq || cp - cq > 3) | |
1252 | break; | |
1253 | if (*cp == '.' || octets == 3) | |
1254 | octets++; | |
1255 | if (octets < 4) | |
1256 | cp++; | |
1257 | cq = cp; | |
1258 | } | |
1259 | if (octets == 4 && (*cp == ':' || *cp == '\0')) { | |
1260 | if (*cp == ':') | |
1261 | *cp++ = '\0'; | |
1262 | addr = in_aton(name); | |
1263 | memmove(name, cp, strlen(cp) + 1); | |
1264 | } else | |
5a874db4 | 1265 | addr = NONE; |
1da177e4 LT |
1266 | |
1267 | return addr; | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * IP Autoconfig dispatcher. | |
1272 | */ | |
1273 | ||
1274 | static int __init ip_auto_config(void) | |
1275 | { | |
5a874db4 | 1276 | __be32 addr; |
1da177e4 LT |
1277 | |
1278 | #ifdef CONFIG_PROC_FS | |
457c4cbc | 1279 | proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); |
1da177e4 LT |
1280 | #endif /* CONFIG_PROC_FS */ |
1281 | ||
1282 | if (!ic_enable) | |
1283 | return 0; | |
1284 | ||
1285 | DBG(("IP-Config: Entered.\n")); | |
1286 | #ifdef IPCONFIG_DYNAMIC | |
1287 | try_try_again: | |
1288 | #endif | |
1289 | /* Give hardware a chance to settle */ | |
1290 | msleep(CONF_PRE_OPEN); | |
1291 | ||
1292 | /* Setup all network devices */ | |
1293 | if (ic_open_devs() < 0) | |
1294 | return -1; | |
1295 | ||
1296 | /* Give drivers a chance to settle */ | |
1297 | ssleep(CONF_POST_OPEN); | |
1298 | ||
1299 | /* | |
1300 | * If the config information is insufficient (e.g., our IP address or | |
1301 | * IP address of the boot server is missing or we have multiple network | |
1302 | * interfaces and no default was set), use BOOTP or RARP to get the | |
1303 | * missing values. | |
1304 | */ | |
5a874db4 | 1305 | if (ic_myaddr == NONE || |
1da177e4 | 1306 | #ifdef CONFIG_ROOT_NFS |
dcbdc93c JT |
1307 | (root_server_addr == NONE |
1308 | && ic_servaddr == NONE | |
1309 | && ROOT_DEV == Root_NFS) || | |
1da177e4 LT |
1310 | #endif |
1311 | ic_first_dev->next) { | |
1312 | #ifdef IPCONFIG_DYNAMIC | |
e905a9ed | 1313 | |
1da177e4 LT |
1314 | int retries = CONF_OPEN_RETRIES; |
1315 | ||
1316 | if (ic_dynamic() < 0) { | |
1317 | ic_close_devs(); | |
1318 | ||
1319 | /* | |
1320 | * I don't know why, but sometimes the | |
1321 | * eepro100 driver (at least) gets upset and | |
1322 | * doesn't work the first time it's opened. | |
1323 | * But then if you close it and reopen it, it | |
1324 | * works just fine. So we need to try that at | |
1325 | * least once before giving up. | |
1326 | * | |
1327 | * Also, if the root will be NFS-mounted, we | |
1328 | * have nowhere to go if DHCP fails. So we | |
1329 | * just have to keep trying forever. | |
1330 | * | |
1331 | * -- Chip | |
1332 | */ | |
1333 | #ifdef CONFIG_ROOT_NFS | |
1334 | if (ROOT_DEV == Root_NFS) { | |
e905a9ed | 1335 | printk(KERN_ERR |
1da177e4 LT |
1336 | "IP-Config: Retrying forever (NFS root)...\n"); |
1337 | goto try_try_again; | |
1338 | } | |
1339 | #endif | |
1340 | ||
1341 | if (--retries) { | |
e905a9ed | 1342 | printk(KERN_ERR |
1da177e4 LT |
1343 | "IP-Config: Reopening network devices...\n"); |
1344 | goto try_try_again; | |
1345 | } | |
1346 | ||
1347 | /* Oh, well. At least we tried. */ | |
1348 | printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); | |
1349 | return -1; | |
1350 | } | |
1351 | #else /* !DYNAMIC */ | |
1352 | printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); | |
1353 | ic_close_devs(); | |
1354 | return -1; | |
1355 | #endif /* IPCONFIG_DYNAMIC */ | |
1356 | } else { | |
1357 | /* Device selected manually or only one device -> use it */ | |
1358 | ic_dev = ic_first_dev->dev; | |
1359 | } | |
1360 | ||
1361 | addr = root_nfs_parse_addr(root_server_path); | |
5a874db4 | 1362 | if (root_server_addr == NONE) |
1da177e4 LT |
1363 | root_server_addr = addr; |
1364 | ||
1365 | /* | |
1366 | * Use defaults whereever applicable. | |
1367 | */ | |
1368 | if (ic_defaults() < 0) | |
1369 | return -1; | |
1370 | ||
1371 | /* | |
1372 | * Close all network devices except the device we've | |
1373 | * autoconfigured and set up routes. | |
1374 | */ | |
1375 | ic_close_devs(); | |
1376 | if (ic_setup_if() < 0 || ic_setup_routes() < 0) | |
1377 | return -1; | |
1378 | ||
1379 | /* | |
1380 | * Record which protocol was actually used. | |
1381 | */ | |
1382 | #ifdef IPCONFIG_DYNAMIC | |
1383 | ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); | |
1384 | #endif | |
1385 | ||
1386 | #ifndef IPCONFIG_SILENT | |
1387 | /* | |
1388 | * Clue in the operator. | |
1389 | */ | |
1390 | printk("IP-Config: Complete:"); | |
9c00409a | 1391 | printk("\n device=%s", ic_dev->name); |
a7d632b6 YH |
1392 | printk(", addr=" NIPQUAD_FMT, NIPQUAD(ic_myaddr)); |
1393 | printk(", mask=" NIPQUAD_FMT, NIPQUAD(ic_netmask)); | |
1394 | printk(", gw=" NIPQUAD_FMT, NIPQUAD(ic_gateway)); | |
1da177e4 | 1395 | printk(",\n host=%s, domain=%s, nis-domain=%s", |
e9ff3990 | 1396 | utsname()->nodename, ic_domain, utsname()->domainname); |
a7d632b6 YH |
1397 | printk(",\n bootserver=" NIPQUAD_FMT, NIPQUAD(ic_servaddr)); |
1398 | printk(", rootserver=" NIPQUAD_FMT, NIPQUAD(root_server_addr)); | |
1da177e4 LT |
1399 | printk(", rootpath=%s", root_server_path); |
1400 | printk("\n"); | |
1401 | #endif /* !SILENT */ | |
1402 | ||
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | late_initcall(ip_auto_config); | |
1407 | ||
1408 | ||
1409 | /* | |
1410 | * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel | |
6ded55da | 1411 | * command line parameter. See Documentation/filesystems/nfsroot.txt. |
1da177e4 LT |
1412 | */ |
1413 | static int __init ic_proto_name(char *name) | |
1414 | { | |
1415 | if (!strcmp(name, "on") || !strcmp(name, "any")) { | |
1416 | return 1; | |
1417 | } | |
a6c05c3d | 1418 | if (!strcmp(name, "off") || !strcmp(name, "none")) { |
92ffb85d | 1419 | return 0; |
a6c05c3d | 1420 | } |
1da177e4 LT |
1421 | #ifdef CONFIG_IP_PNP_DHCP |
1422 | else if (!strcmp(name, "dhcp")) { | |
1423 | ic_proto_enabled &= ~IC_RARP; | |
1424 | return 1; | |
1425 | } | |
1426 | #endif | |
1427 | #ifdef CONFIG_IP_PNP_BOOTP | |
1428 | else if (!strcmp(name, "bootp")) { | |
1429 | ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); | |
1430 | return 1; | |
1431 | } | |
1432 | #endif | |
1433 | #ifdef CONFIG_IP_PNP_RARP | |
1434 | else if (!strcmp(name, "rarp")) { | |
1435 | ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); | |
1436 | return 1; | |
1437 | } | |
1438 | #endif | |
1439 | #ifdef IPCONFIG_DYNAMIC | |
1440 | else if (!strcmp(name, "both")) { | |
1441 | ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ | |
1442 | return 1; | |
1443 | } | |
1444 | #endif | |
1445 | return 0; | |
1446 | } | |
1447 | ||
1448 | static int __init ip_auto_config_setup(char *addrs) | |
1449 | { | |
1450 | char *cp, *ip, *dp; | |
1451 | int num = 0; | |
1452 | ||
1453 | ic_set_manually = 1; | |
9cecd07c | 1454 | ic_enable = 1; |
1da177e4 | 1455 | |
92ffb85d AW |
1456 | /* |
1457 | * If any dhcp, bootp etc options are set, leave autoconfig on | |
1458 | * and skip the below static IP processing. | |
1459 | */ | |
1da177e4 LT |
1460 | if (ic_proto_name(addrs)) |
1461 | return 1; | |
1462 | ||
92ffb85d AW |
1463 | /* If no static IP is given, turn off autoconfig and bail. */ |
1464 | if (*addrs == 0 || | |
1465 | strcmp(addrs, "off") == 0 || | |
1466 | strcmp(addrs, "none") == 0) { | |
1467 | ic_enable = 0; | |
1468 | return 1; | |
1469 | } | |
1470 | ||
1471 | /* Parse string for static IP assignment. */ | |
1da177e4 LT |
1472 | ip = addrs; |
1473 | while (ip && *ip) { | |
1474 | if ((cp = strchr(ip, ':'))) | |
1475 | *cp++ = '\0'; | |
1476 | if (strlen(ip) > 0) { | |
1477 | DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); | |
1478 | switch (num) { | |
1479 | case 0: | |
e6f1cebf | 1480 | if ((ic_myaddr = in_aton(ip)) == ANY) |
5a874db4 | 1481 | ic_myaddr = NONE; |
1da177e4 LT |
1482 | break; |
1483 | case 1: | |
e6f1cebf | 1484 | if ((ic_servaddr = in_aton(ip)) == ANY) |
5a874db4 | 1485 | ic_servaddr = NONE; |
1da177e4 LT |
1486 | break; |
1487 | case 2: | |
e6f1cebf | 1488 | if ((ic_gateway = in_aton(ip)) == ANY) |
5a874db4 | 1489 | ic_gateway = NONE; |
1da177e4 LT |
1490 | break; |
1491 | case 3: | |
e6f1cebf | 1492 | if ((ic_netmask = in_aton(ip)) == ANY) |
5a874db4 | 1493 | ic_netmask = NONE; |
1da177e4 LT |
1494 | break; |
1495 | case 4: | |
1496 | if ((dp = strchr(ip, '.'))) { | |
1497 | *dp++ = '\0'; | |
e9ff3990 SH |
1498 | strlcpy(utsname()->domainname, dp, |
1499 | sizeof(utsname()->domainname)); | |
1da177e4 | 1500 | } |
e9ff3990 SH |
1501 | strlcpy(utsname()->nodename, ip, |
1502 | sizeof(utsname()->nodename)); | |
1da177e4 LT |
1503 | ic_host_name_set = 1; |
1504 | break; | |
1505 | case 5: | |
1506 | strlcpy(user_dev_name, ip, sizeof(user_dev_name)); | |
1507 | break; | |
1508 | case 6: | |
92ffb85d AW |
1509 | if (ic_proto_name(ip) == 0 && |
1510 | ic_myaddr == NONE) { | |
1511 | ic_enable = 0; | |
1512 | } | |
1da177e4 LT |
1513 | break; |
1514 | } | |
1515 | } | |
1516 | ip = cp; | |
1517 | num++; | |
1518 | } | |
1519 | ||
1520 | return 1; | |
1521 | } | |
1522 | ||
1523 | static int __init nfsaddrs_config_setup(char *addrs) | |
1524 | { | |
1525 | return ip_auto_config_setup(addrs); | |
1526 | } | |
1527 | ||
62013dbb RJ |
1528 | static int __init vendor_class_identifier_setup(char *addrs) |
1529 | { | |
1530 | if (strlcpy(vendor_class_identifier, addrs, | |
1531 | sizeof(vendor_class_identifier)) | |
1532 | >= sizeof(vendor_class_identifier)) | |
1533 | printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", | |
1534 | vendor_class_identifier); | |
1535 | return 1; | |
1536 | } | |
1537 | ||
1da177e4 LT |
1538 | __setup("ip=", ip_auto_config_setup); |
1539 | __setup("nfsaddrs=", nfsaddrs_config_setup); | |
62013dbb | 1540 | __setup("dhcpclass=", vendor_class_identifier_setup); |