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