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Commit | Line | Data |
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1 | /* | |
2 | * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or | |
3 | * user-supplied information to configure own IP address and routes. | |
4 | * | |
5 | * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> | |
6 | * | |
7 | * Derived from network configuration code in fs/nfs/nfsroot.c, | |
8 | * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. | |
9 | * | |
10 | * BOOTP rewritten to construct and analyse packets itself instead | |
11 | * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; | |
12 | * -- MJ, December 1998 | |
13 | * | |
14 | * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" | |
15 | * initialization scheme. | |
16 | * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 | |
17 | * | |
18 | * DHCP support added. To users this looks like a whole separate | |
19 | * protocol, but we know it's just a bag on the side of BOOTP. | |
20 | * -- Chip Salzenberg <chip@valinux.com>, May 2000 | |
21 | * | |
22 | * Ported DHCP support from 2.2.16 to 2.4.0-test4 | |
23 | * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 | |
24 | * | |
25 | * Merged changes from 2.2.19 into 2.4.3 | |
26 | * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 | |
27 | * | |
28 | * Multiple Nameservers in /proc/net/pnp | |
29 | * -- Josef Siemes <jsiemes@web.de>, Aug 2002 | |
30 | */ | |
31 | ||
32 | #include <linux/types.h> | |
33 | #include <linux/string.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/jiffies.h> | |
36 | #include <linux/random.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/utsname.h> | |
39 | #include <linux/in.h> | |
40 | #include <linux/if.h> | |
41 | #include <linux/inet.h> | |
42 | #include <linux/inetdevice.h> | |
43 | #include <linux/netdevice.h> | |
44 | #include <linux/if_arp.h> | |
45 | #include <linux/skbuff.h> | |
46 | #include <linux/ip.h> | |
47 | #include <linux/socket.h> | |
48 | #include <linux/route.h> | |
49 | #include <linux/udp.h> | |
50 | #include <linux/proc_fs.h> | |
51 | #include <linux/seq_file.h> | |
52 | #include <linux/major.h> | |
53 | #include <linux/root_dev.h> | |
54 | #include <linux/delay.h> | |
55 | #include <linux/nfs_fs.h> | |
56 | #include <linux/slab.h> | |
57 | #include <net/net_namespace.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 cpu_to_be32(INADDR_NONE) | |
105 | #define ANY cpu_to_be32(INADDR_ANY) | |
106 | ||
107 | /* | |
108 | * Public IP configuration | |
109 | */ | |
110 | ||
111 | /* This is used by platforms which might be able to set the ipconfig | |
112 | * variables using firmware environment vars. If this is set, it will | |
113 | * ignore such firmware variables. | |
114 | */ | |
115 | int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ | |
116 | ||
117 | static int ic_enable __initdata = 0; /* IP config enabled? */ | |
118 | ||
119 | /* Protocol choice */ | |
120 | int ic_proto_enabled __initdata = 0 | |
121 | #ifdef IPCONFIG_BOOTP | |
122 | | IC_BOOTP | |
123 | #endif | |
124 | #ifdef CONFIG_IP_PNP_DHCP | |
125 | | IC_USE_DHCP | |
126 | #endif | |
127 | #ifdef IPCONFIG_RARP | |
128 | | IC_RARP | |
129 | #endif | |
130 | ; | |
131 | ||
132 | static int ic_host_name_set __initdata = 0; /* Host name set by us? */ | |
133 | ||
134 | __be32 ic_myaddr = NONE; /* My IP address */ | |
135 | static __be32 ic_netmask = NONE; /* Netmask for local subnet */ | |
136 | __be32 ic_gateway = NONE; /* Gateway IP address */ | |
137 | ||
138 | __be32 ic_servaddr = NONE; /* Boot server IP address */ | |
139 | ||
140 | __be32 root_server_addr = NONE; /* Address of NFS server */ | |
141 | u8 root_server_path[256] = { 0, }; /* Path to mount as root */ | |
142 | ||
143 | u32 ic_dev_xid; /* Device under configuration */ | |
144 | ||
145 | /* vendor class identifier */ | |
146 | static char vendor_class_identifier[253] __initdata; | |
147 | ||
148 | /* Persistent data: */ | |
149 | ||
150 | static int ic_proto_used; /* Protocol used, if any */ | |
151 | static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ | |
152 | static u8 ic_domain[64]; /* DNS (not NIS) domain name */ | |
153 | ||
154 | /* | |
155 | * Private state. | |
156 | */ | |
157 | ||
158 | /* Name of user-selected boot device */ | |
159 | static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; | |
160 | ||
161 | /* Protocols supported by available interfaces */ | |
162 | static int ic_proto_have_if __initdata = 0; | |
163 | ||
164 | /* MTU for boot device */ | |
165 | static int ic_dev_mtu __initdata = 0; | |
166 | ||
167 | #ifdef IPCONFIG_DYNAMIC | |
168 | static DEFINE_SPINLOCK(ic_recv_lock); | |
169 | static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ | |
170 | #endif | |
171 | #ifdef IPCONFIG_DHCP | |
172 | static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ | |
173 | #endif | |
174 | ||
175 | ||
176 | /* | |
177 | * Network devices | |
178 | */ | |
179 | ||
180 | struct ic_device { | |
181 | struct ic_device *next; | |
182 | struct net_device *dev; | |
183 | unsigned short flags; | |
184 | short able; | |
185 | __be32 xid; | |
186 | }; | |
187 | ||
188 | static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ | |
189 | static struct net_device *ic_dev __initdata = NULL; /* Selected device */ | |
190 | ||
191 | static bool __init ic_device_match(struct net_device *dev) | |
192 | { | |
193 | if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : | |
194 | (!(dev->flags & IFF_LOOPBACK) && | |
195 | (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && | |
196 | strncmp(dev->name, "dummy", 5))) | |
197 | return true; | |
198 | return false; | |
199 | } | |
200 | ||
201 | static int __init ic_open_devs(void) | |
202 | { | |
203 | struct ic_device *d, **last; | |
204 | struct net_device *dev; | |
205 | unsigned short oflags; | |
206 | ||
207 | last = &ic_first_dev; | |
208 | rtnl_lock(); | |
209 | ||
210 | /* bring loopback device up first */ | |
211 | for_each_netdev(&init_net, dev) { | |
212 | if (!(dev->flags & IFF_LOOPBACK)) | |
213 | continue; | |
214 | if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) | |
215 | printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); | |
216 | } | |
217 | ||
218 | for_each_netdev(&init_net, dev) { | |
219 | if (dev->flags & IFF_LOOPBACK) | |
220 | continue; | |
221 | if (ic_device_match(dev)) { | |
222 | int able = 0; | |
223 | if (dev->mtu >= 364) | |
224 | able |= IC_BOOTP; | |
225 | else | |
226 | printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); | |
227 | if (!(dev->flags & IFF_NOARP)) | |
228 | able |= IC_RARP; | |
229 | able &= ic_proto_enabled; | |
230 | if (ic_proto_enabled && !able) | |
231 | continue; | |
232 | oflags = dev->flags; | |
233 | if (dev_change_flags(dev, oflags | IFF_UP) < 0) { | |
234 | printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); | |
235 | continue; | |
236 | } | |
237 | if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { | |
238 | rtnl_unlock(); | |
239 | return -ENOMEM; | |
240 | } | |
241 | d->dev = dev; | |
242 | *last = d; | |
243 | last = &d->next; | |
244 | d->flags = oflags; | |
245 | d->able = able; | |
246 | if (able & IC_BOOTP) | |
247 | get_random_bytes(&d->xid, sizeof(__be32)); | |
248 | else | |
249 | d->xid = 0; | |
250 | ic_proto_have_if |= able; | |
251 | DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", | |
252 | dev->name, able, d->xid)); | |
253 | } | |
254 | } | |
255 | rtnl_unlock(); | |
256 | ||
257 | *last = NULL; | |
258 | ||
259 | if (!ic_first_dev) { | |
260 | if (user_dev_name[0]) | |
261 | printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); | |
262 | else | |
263 | printk(KERN_ERR "IP-Config: No network devices available.\n"); | |
264 | return -ENODEV; | |
265 | } | |
266 | return 0; | |
267 | } | |
268 | ||
269 | static void __init ic_close_devs(void) | |
270 | { | |
271 | struct ic_device *d, *next; | |
272 | struct net_device *dev; | |
273 | ||
274 | rtnl_lock(); | |
275 | next = ic_first_dev; | |
276 | while ((d = next)) { | |
277 | next = d->next; | |
278 | dev = d->dev; | |
279 | if (dev != ic_dev) { | |
280 | DBG(("IP-Config: Downing %s\n", dev->name)); | |
281 | dev_change_flags(dev, d->flags); | |
282 | } | |
283 | kfree(d); | |
284 | } | |
285 | rtnl_unlock(); | |
286 | } | |
287 | ||
288 | /* | |
289 | * Interface to various network functions. | |
290 | */ | |
291 | ||
292 | static inline void | |
293 | set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) | |
294 | { | |
295 | sin->sin_family = AF_INET; | |
296 | sin->sin_addr.s_addr = addr; | |
297 | sin->sin_port = port; | |
298 | } | |
299 | ||
300 | static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) | |
301 | { | |
302 | int res; | |
303 | ||
304 | mm_segment_t oldfs = get_fs(); | |
305 | set_fs(get_ds()); | |
306 | res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); | |
307 | set_fs(oldfs); | |
308 | return res; | |
309 | } | |
310 | ||
311 | static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) | |
312 | { | |
313 | int res; | |
314 | ||
315 | mm_segment_t oldfs = get_fs(); | |
316 | set_fs(get_ds()); | |
317 | res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); | |
318 | set_fs(oldfs); | |
319 | return res; | |
320 | } | |
321 | ||
322 | static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) | |
323 | { | |
324 | int res; | |
325 | ||
326 | mm_segment_t oldfs = get_fs(); | |
327 | set_fs(get_ds()); | |
328 | res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); | |
329 | set_fs(oldfs); | |
330 | return res; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Set up interface addresses and routes. | |
335 | */ | |
336 | ||
337 | static int __init ic_setup_if(void) | |
338 | { | |
339 | struct ifreq ir; | |
340 | struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; | |
341 | int err; | |
342 | ||
343 | memset(&ir, 0, sizeof(ir)); | |
344 | strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); | |
345 | set_sockaddr(sin, ic_myaddr, 0); | |
346 | if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { | |
347 | printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); | |
348 | return -1; | |
349 | } | |
350 | set_sockaddr(sin, ic_netmask, 0); | |
351 | if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { | |
352 | printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); | |
353 | return -1; | |
354 | } | |
355 | set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); | |
356 | if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { | |
357 | printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); | |
358 | return -1; | |
359 | } | |
360 | /* Handle the case where we need non-standard MTU on the boot link (a network | |
361 | * using jumbo frames, for instance). If we can't set the mtu, don't error | |
362 | * out, we'll try to muddle along. | |
363 | */ | |
364 | if (ic_dev_mtu != 0) { | |
365 | strcpy(ir.ifr_name, ic_dev->name); | |
366 | ir.ifr_mtu = ic_dev_mtu; | |
367 | if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) | |
368 | printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n", | |
369 | ic_dev_mtu, err); | |
370 | } | |
371 | return 0; | |
372 | } | |
373 | ||
374 | static int __init ic_setup_routes(void) | |
375 | { | |
376 | /* No need to setup device routes, only the default route... */ | |
377 | ||
378 | if (ic_gateway != NONE) { | |
379 | struct rtentry rm; | |
380 | int err; | |
381 | ||
382 | memset(&rm, 0, sizeof(rm)); | |
383 | if ((ic_gateway ^ ic_myaddr) & ic_netmask) { | |
384 | printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); | |
385 | return -1; | |
386 | } | |
387 | set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); | |
388 | set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); | |
389 | set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); | |
390 | rm.rt_flags = RTF_UP | RTF_GATEWAY; | |
391 | if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { | |
392 | printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); | |
393 | return -1; | |
394 | } | |
395 | } | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | /* | |
401 | * Fill in default values for all missing parameters. | |
402 | */ | |
403 | ||
404 | static int __init ic_defaults(void) | |
405 | { | |
406 | /* | |
407 | * At this point we have no userspace running so need not | |
408 | * claim locks on system_utsname | |
409 | */ | |
410 | ||
411 | if (!ic_host_name_set) | |
412 | sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); | |
413 | ||
414 | if (root_server_addr == NONE) | |
415 | root_server_addr = ic_servaddr; | |
416 | ||
417 | if (ic_netmask == NONE) { | |
418 | if (IN_CLASSA(ntohl(ic_myaddr))) | |
419 | ic_netmask = htonl(IN_CLASSA_NET); | |
420 | else if (IN_CLASSB(ntohl(ic_myaddr))) | |
421 | ic_netmask = htonl(IN_CLASSB_NET); | |
422 | else if (IN_CLASSC(ntohl(ic_myaddr))) | |
423 | ic_netmask = htonl(IN_CLASSC_NET); | |
424 | else { | |
425 | printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n", | |
426 | &ic_myaddr); | |
427 | return -1; | |
428 | } | |
429 | printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); | |
430 | } | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
435 | /* | |
436 | * RARP support. | |
437 | */ | |
438 | ||
439 | #ifdef IPCONFIG_RARP | |
440 | ||
441 | static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); | |
442 | ||
443 | static struct packet_type rarp_packet_type __initdata = { | |
444 | .type = cpu_to_be16(ETH_P_RARP), | |
445 | .func = ic_rarp_recv, | |
446 | }; | |
447 | ||
448 | static inline void __init ic_rarp_init(void) | |
449 | { | |
450 | dev_add_pack(&rarp_packet_type); | |
451 | } | |
452 | ||
453 | static inline void __init ic_rarp_cleanup(void) | |
454 | { | |
455 | dev_remove_pack(&rarp_packet_type); | |
456 | } | |
457 | ||
458 | /* | |
459 | * Process received RARP packet. | |
460 | */ | |
461 | static int __init | |
462 | ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) | |
463 | { | |
464 | struct arphdr *rarp; | |
465 | unsigned char *rarp_ptr; | |
466 | __be32 sip, tip; | |
467 | unsigned char *sha, *tha; /* s for "source", t for "target" */ | |
468 | struct ic_device *d; | |
469 | ||
470 | if (!net_eq(dev_net(dev), &init_net)) | |
471 | goto drop; | |
472 | ||
473 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
474 | return NET_RX_DROP; | |
475 | ||
476 | if (!pskb_may_pull(skb, sizeof(struct arphdr))) | |
477 | goto drop; | |
478 | ||
479 | /* Basic sanity checks can be done without the lock. */ | |
480 | rarp = (struct arphdr *)skb_transport_header(skb); | |
481 | ||
482 | /* If this test doesn't pass, it's not IP, or we should | |
483 | * ignore it anyway. | |
484 | */ | |
485 | if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) | |
486 | goto drop; | |
487 | ||
488 | /* If it's not a RARP reply, delete it. */ | |
489 | if (rarp->ar_op != htons(ARPOP_RREPLY)) | |
490 | goto drop; | |
491 | ||
492 | /* If it's not Ethernet, delete it. */ | |
493 | if (rarp->ar_pro != htons(ETH_P_IP)) | |
494 | goto drop; | |
495 | ||
496 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) | |
497 | goto drop; | |
498 | ||
499 | /* OK, it is all there and looks valid, process... */ | |
500 | rarp = (struct arphdr *)skb_transport_header(skb); | |
501 | rarp_ptr = (unsigned char *) (rarp + 1); | |
502 | ||
503 | /* One reply at a time, please. */ | |
504 | spin_lock(&ic_recv_lock); | |
505 | ||
506 | /* If we already have a reply, just drop the packet */ | |
507 | if (ic_got_reply) | |
508 | goto drop_unlock; | |
509 | ||
510 | /* Find the ic_device that the packet arrived on */ | |
511 | d = ic_first_dev; | |
512 | while (d && d->dev != dev) | |
513 | d = d->next; | |
514 | if (!d) | |
515 | goto drop_unlock; /* should never happen */ | |
516 | ||
517 | /* Extract variable-width fields */ | |
518 | sha = rarp_ptr; | |
519 | rarp_ptr += dev->addr_len; | |
520 | memcpy(&sip, rarp_ptr, 4); | |
521 | rarp_ptr += 4; | |
522 | tha = rarp_ptr; | |
523 | rarp_ptr += dev->addr_len; | |
524 | memcpy(&tip, rarp_ptr, 4); | |
525 | ||
526 | /* Discard packets which are not meant for us. */ | |
527 | if (memcmp(tha, dev->dev_addr, dev->addr_len)) | |
528 | goto drop_unlock; | |
529 | ||
530 | /* Discard packets which are not from specified server. */ | |
531 | if (ic_servaddr != NONE && ic_servaddr != sip) | |
532 | goto drop_unlock; | |
533 | ||
534 | /* We have a winner! */ | |
535 | ic_dev = dev; | |
536 | if (ic_myaddr == NONE) | |
537 | ic_myaddr = tip; | |
538 | ic_servaddr = sip; | |
539 | ic_got_reply = IC_RARP; | |
540 | ||
541 | drop_unlock: | |
542 | /* Show's over. Nothing to see here. */ | |
543 | spin_unlock(&ic_recv_lock); | |
544 | ||
545 | drop: | |
546 | /* Throw the packet out. */ | |
547 | kfree_skb(skb); | |
548 | return 0; | |
549 | } | |
550 | ||
551 | ||
552 | /* | |
553 | * Send RARP request packet over a single interface. | |
554 | */ | |
555 | static void __init ic_rarp_send_if(struct ic_device *d) | |
556 | { | |
557 | struct net_device *dev = d->dev; | |
558 | arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, | |
559 | dev->dev_addr, dev->dev_addr); | |
560 | } | |
561 | #endif | |
562 | ||
563 | /* | |
564 | * DHCP/BOOTP support. | |
565 | */ | |
566 | ||
567 | #ifdef IPCONFIG_BOOTP | |
568 | ||
569 | struct bootp_pkt { /* BOOTP packet format */ | |
570 | struct iphdr iph; /* IP header */ | |
571 | struct udphdr udph; /* UDP header */ | |
572 | u8 op; /* 1=request, 2=reply */ | |
573 | u8 htype; /* HW address type */ | |
574 | u8 hlen; /* HW address length */ | |
575 | u8 hops; /* Used only by gateways */ | |
576 | __be32 xid; /* Transaction ID */ | |
577 | __be16 secs; /* Seconds since we started */ | |
578 | __be16 flags; /* Just what it says */ | |
579 | __be32 client_ip; /* Client's IP address if known */ | |
580 | __be32 your_ip; /* Assigned IP address */ | |
581 | __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ | |
582 | __be32 relay_ip; /* IP address of BOOTP relay */ | |
583 | u8 hw_addr[16]; /* Client's HW address */ | |
584 | u8 serv_name[64]; /* Server host name */ | |
585 | u8 boot_file[128]; /* Name of boot file */ | |
586 | u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ | |
587 | }; | |
588 | ||
589 | /* packet ops */ | |
590 | #define BOOTP_REQUEST 1 | |
591 | #define BOOTP_REPLY 2 | |
592 | ||
593 | /* DHCP message types */ | |
594 | #define DHCPDISCOVER 1 | |
595 | #define DHCPOFFER 2 | |
596 | #define DHCPREQUEST 3 | |
597 | #define DHCPDECLINE 4 | |
598 | #define DHCPACK 5 | |
599 | #define DHCPNAK 6 | |
600 | #define DHCPRELEASE 7 | |
601 | #define DHCPINFORM 8 | |
602 | ||
603 | static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); | |
604 | ||
605 | static struct packet_type bootp_packet_type __initdata = { | |
606 | .type = cpu_to_be16(ETH_P_IP), | |
607 | .func = ic_bootp_recv, | |
608 | }; | |
609 | ||
610 | ||
611 | /* | |
612 | * Initialize DHCP/BOOTP extension fields in the request. | |
613 | */ | |
614 | ||
615 | static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; | |
616 | ||
617 | #ifdef IPCONFIG_DHCP | |
618 | ||
619 | static void __init | |
620 | ic_dhcp_init_options(u8 *options) | |
621 | { | |
622 | u8 mt = ((ic_servaddr == NONE) | |
623 | ? DHCPDISCOVER : DHCPREQUEST); | |
624 | u8 *e = options; | |
625 | int len; | |
626 | ||
627 | #ifdef IPCONFIG_DEBUG | |
628 | printk("DHCP: Sending message type %d\n", mt); | |
629 | #endif | |
630 | ||
631 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ | |
632 | e += 4; | |
633 | ||
634 | *e++ = 53; /* DHCP message type */ | |
635 | *e++ = 1; | |
636 | *e++ = mt; | |
637 | ||
638 | if (mt == DHCPREQUEST) { | |
639 | *e++ = 54; /* Server ID (IP address) */ | |
640 | *e++ = 4; | |
641 | memcpy(e, &ic_servaddr, 4); | |
642 | e += 4; | |
643 | ||
644 | *e++ = 50; /* Requested IP address */ | |
645 | *e++ = 4; | |
646 | memcpy(e, &ic_myaddr, 4); | |
647 | e += 4; | |
648 | } | |
649 | ||
650 | /* always? */ | |
651 | { | |
652 | static const u8 ic_req_params[] = { | |
653 | 1, /* Subnet mask */ | |
654 | 3, /* Default gateway */ | |
655 | 6, /* DNS server */ | |
656 | 12, /* Host name */ | |
657 | 15, /* Domain name */ | |
658 | 17, /* Boot path */ | |
659 | 26, /* MTU */ | |
660 | 40, /* NIS domain name */ | |
661 | }; | |
662 | ||
663 | *e++ = 55; /* Parameter request list */ | |
664 | *e++ = sizeof(ic_req_params); | |
665 | memcpy(e, ic_req_params, sizeof(ic_req_params)); | |
666 | e += sizeof(ic_req_params); | |
667 | ||
668 | if (ic_host_name_set) { | |
669 | *e++ = 12; /* host-name */ | |
670 | len = strlen(utsname()->nodename); | |
671 | *e++ = len; | |
672 | memcpy(e, utsname()->nodename, len); | |
673 | e += len; | |
674 | } | |
675 | if (*vendor_class_identifier) { | |
676 | printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", | |
677 | vendor_class_identifier); | |
678 | *e++ = 60; /* Class-identifier */ | |
679 | len = strlen(vendor_class_identifier); | |
680 | *e++ = len; | |
681 | memcpy(e, vendor_class_identifier, len); | |
682 | e += len; | |
683 | } | |
684 | } | |
685 | ||
686 | *e++ = 255; /* End of the list */ | |
687 | } | |
688 | ||
689 | #endif /* IPCONFIG_DHCP */ | |
690 | ||
691 | static void __init ic_bootp_init_ext(u8 *e) | |
692 | { | |
693 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ | |
694 | e += 4; | |
695 | *e++ = 1; /* Subnet mask request */ | |
696 | *e++ = 4; | |
697 | e += 4; | |
698 | *e++ = 3; /* Default gateway request */ | |
699 | *e++ = 4; | |
700 | e += 4; | |
701 | *e++ = 5; /* Name server request */ | |
702 | *e++ = 8; | |
703 | e += 8; | |
704 | *e++ = 12; /* Host name request */ | |
705 | *e++ = 32; | |
706 | e += 32; | |
707 | *e++ = 40; /* NIS Domain name request */ | |
708 | *e++ = 32; | |
709 | e += 32; | |
710 | *e++ = 17; /* Boot path */ | |
711 | *e++ = 40; | |
712 | e += 40; | |
713 | ||
714 | *e++ = 57; /* set extension buffer size for reply */ | |
715 | *e++ = 2; | |
716 | *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ | |
717 | *e++ = 150; | |
718 | ||
719 | *e++ = 255; /* End of the list */ | |
720 | } | |
721 | ||
722 | ||
723 | /* | |
724 | * Initialize the DHCP/BOOTP mechanism. | |
725 | */ | |
726 | static inline void __init ic_bootp_init(void) | |
727 | { | |
728 | int i; | |
729 | ||
730 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) | |
731 | ic_nameservers[i] = NONE; | |
732 | ||
733 | dev_add_pack(&bootp_packet_type); | |
734 | } | |
735 | ||
736 | ||
737 | /* | |
738 | * DHCP/BOOTP cleanup. | |
739 | */ | |
740 | static inline void __init ic_bootp_cleanup(void) | |
741 | { | |
742 | dev_remove_pack(&bootp_packet_type); | |
743 | } | |
744 | ||
745 | ||
746 | /* | |
747 | * Send DHCP/BOOTP request to single interface. | |
748 | */ | |
749 | static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) | |
750 | { | |
751 | struct net_device *dev = d->dev; | |
752 | struct sk_buff *skb; | |
753 | struct bootp_pkt *b; | |
754 | struct iphdr *h; | |
755 | ||
756 | /* Allocate packet */ | |
757 | skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15, | |
758 | GFP_KERNEL); | |
759 | if (!skb) | |
760 | return; | |
761 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
762 | b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); | |
763 | memset(b, 0, sizeof(struct bootp_pkt)); | |
764 | ||
765 | /* Construct IP header */ | |
766 | skb_reset_network_header(skb); | |
767 | h = ip_hdr(skb); | |
768 | h->version = 4; | |
769 | h->ihl = 5; | |
770 | h->tot_len = htons(sizeof(struct bootp_pkt)); | |
771 | h->frag_off = htons(IP_DF); | |
772 | h->ttl = 64; | |
773 | h->protocol = IPPROTO_UDP; | |
774 | h->daddr = htonl(INADDR_BROADCAST); | |
775 | h->check = ip_fast_csum((unsigned char *) h, h->ihl); | |
776 | ||
777 | /* Construct UDP header */ | |
778 | b->udph.source = htons(68); | |
779 | b->udph.dest = htons(67); | |
780 | b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); | |
781 | /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ | |
782 | ||
783 | /* Construct DHCP/BOOTP header */ | |
784 | b->op = BOOTP_REQUEST; | |
785 | if (dev->type < 256) /* check for false types */ | |
786 | b->htype = dev->type; | |
787 | else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ | |
788 | b->htype = ARPHRD_IEEE802; | |
789 | else if (dev->type == ARPHRD_FDDI) | |
790 | b->htype = ARPHRD_ETHER; | |
791 | else { | |
792 | printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); | |
793 | b->htype = dev->type; /* can cause undefined behavior */ | |
794 | } | |
795 | ||
796 | /* server_ip and your_ip address are both already zero per RFC2131 */ | |
797 | b->hlen = dev->addr_len; | |
798 | memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); | |
799 | b->secs = htons(jiffies_diff / HZ); | |
800 | b->xid = d->xid; | |
801 | ||
802 | /* add DHCP options or BOOTP extensions */ | |
803 | #ifdef IPCONFIG_DHCP | |
804 | if (ic_proto_enabled & IC_USE_DHCP) | |
805 | ic_dhcp_init_options(b->exten); | |
806 | else | |
807 | #endif | |
808 | ic_bootp_init_ext(b->exten); | |
809 | ||
810 | /* Chain packet down the line... */ | |
811 | skb->dev = dev; | |
812 | skb->protocol = htons(ETH_P_IP); | |
813 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), | |
814 | dev->broadcast, dev->dev_addr, skb->len) < 0 || | |
815 | dev_queue_xmit(skb) < 0) | |
816 | printk("E"); | |
817 | } | |
818 | ||
819 | ||
820 | /* | |
821 | * Copy BOOTP-supplied string if not already set. | |
822 | */ | |
823 | static int __init ic_bootp_string(char *dest, char *src, int len, int max) | |
824 | { | |
825 | if (!len) | |
826 | return 0; | |
827 | if (len > max-1) | |
828 | len = max-1; | |
829 | memcpy(dest, src, len); | |
830 | dest[len] = '\0'; | |
831 | return 1; | |
832 | } | |
833 | ||
834 | ||
835 | /* | |
836 | * Process BOOTP extensions. | |
837 | */ | |
838 | static void __init ic_do_bootp_ext(u8 *ext) | |
839 | { | |
840 | u8 servers; | |
841 | int i; | |
842 | u16 mtu; | |
843 | ||
844 | #ifdef IPCONFIG_DEBUG | |
845 | u8 *c; | |
846 | ||
847 | printk("DHCP/BOOTP: Got extension %d:",*ext); | |
848 | for (c=ext+2; c<ext+2+ext[1]; c++) | |
849 | printk(" %02x", *c); | |
850 | printk("\n"); | |
851 | #endif | |
852 | ||
853 | switch (*ext++) { | |
854 | case 1: /* Subnet mask */ | |
855 | if (ic_netmask == NONE) | |
856 | memcpy(&ic_netmask, ext+1, 4); | |
857 | break; | |
858 | case 3: /* Default gateway */ | |
859 | if (ic_gateway == NONE) | |
860 | memcpy(&ic_gateway, ext+1, 4); | |
861 | break; | |
862 | case 6: /* DNS server */ | |
863 | servers= *ext/4; | |
864 | if (servers > CONF_NAMESERVERS_MAX) | |
865 | servers = CONF_NAMESERVERS_MAX; | |
866 | for (i = 0; i < servers; i++) { | |
867 | if (ic_nameservers[i] == NONE) | |
868 | memcpy(&ic_nameservers[i], ext+1+4*i, 4); | |
869 | } | |
870 | break; | |
871 | case 12: /* Host name */ | |
872 | ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); | |
873 | ic_host_name_set = 1; | |
874 | break; | |
875 | case 15: /* Domain name (DNS) */ | |
876 | ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); | |
877 | break; | |
878 | case 17: /* Root path */ | |
879 | if (!root_server_path[0]) | |
880 | ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); | |
881 | break; | |
882 | case 26: /* Interface MTU */ | |
883 | memcpy(&mtu, ext+1, sizeof(mtu)); | |
884 | ic_dev_mtu = ntohs(mtu); | |
885 | break; | |
886 | case 40: /* NIS Domain name (_not_ DNS) */ | |
887 | ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); | |
888 | break; | |
889 | } | |
890 | } | |
891 | ||
892 | ||
893 | /* | |
894 | * Receive BOOTP reply. | |
895 | */ | |
896 | static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) | |
897 | { | |
898 | struct bootp_pkt *b; | |
899 | struct iphdr *h; | |
900 | struct ic_device *d; | |
901 | int len, ext_len; | |
902 | ||
903 | if (!net_eq(dev_net(dev), &init_net)) | |
904 | goto drop; | |
905 | ||
906 | /* Perform verifications before taking the lock. */ | |
907 | if (skb->pkt_type == PACKET_OTHERHOST) | |
908 | goto drop; | |
909 | ||
910 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
911 | return NET_RX_DROP; | |
912 | ||
913 | if (!pskb_may_pull(skb, | |
914 | sizeof(struct iphdr) + | |
915 | sizeof(struct udphdr))) | |
916 | goto drop; | |
917 | ||
918 | b = (struct bootp_pkt *)skb_network_header(skb); | |
919 | h = &b->iph; | |
920 | ||
921 | if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) | |
922 | goto drop; | |
923 | ||
924 | /* Fragments are not supported */ | |
925 | if (h->frag_off & htons(IP_OFFSET | IP_MF)) { | |
926 | if (net_ratelimit()) | |
927 | printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " | |
928 | "reply.\n"); | |
929 | goto drop; | |
930 | } | |
931 | ||
932 | if (skb->len < ntohs(h->tot_len)) | |
933 | goto drop; | |
934 | ||
935 | if (ip_fast_csum((char *) h, h->ihl)) | |
936 | goto drop; | |
937 | ||
938 | if (b->udph.source != htons(67) || b->udph.dest != htons(68)) | |
939 | goto drop; | |
940 | ||
941 | if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) | |
942 | goto drop; | |
943 | ||
944 | len = ntohs(b->udph.len) - sizeof(struct udphdr); | |
945 | ext_len = len - (sizeof(*b) - | |
946 | sizeof(struct iphdr) - | |
947 | sizeof(struct udphdr) - | |
948 | sizeof(b->exten)); | |
949 | if (ext_len < 0) | |
950 | goto drop; | |
951 | ||
952 | /* Ok the front looks good, make sure we can get at the rest. */ | |
953 | if (!pskb_may_pull(skb, skb->len)) | |
954 | goto drop; | |
955 | ||
956 | b = (struct bootp_pkt *)skb_network_header(skb); | |
957 | h = &b->iph; | |
958 | ||
959 | /* One reply at a time, please. */ | |
960 | spin_lock(&ic_recv_lock); | |
961 | ||
962 | /* If we already have a reply, just drop the packet */ | |
963 | if (ic_got_reply) | |
964 | goto drop_unlock; | |
965 | ||
966 | /* Find the ic_device that the packet arrived on */ | |
967 | d = ic_first_dev; | |
968 | while (d && d->dev != dev) | |
969 | d = d->next; | |
970 | if (!d) | |
971 | goto drop_unlock; /* should never happen */ | |
972 | ||
973 | /* Is it a reply to our BOOTP request? */ | |
974 | if (b->op != BOOTP_REPLY || | |
975 | b->xid != d->xid) { | |
976 | if (net_ratelimit()) | |
977 | printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " | |
978 | "op[%x] xid[%x]\n", | |
979 | b->op, b->xid); | |
980 | goto drop_unlock; | |
981 | } | |
982 | ||
983 | /* Is it a reply for the device we are configuring? */ | |
984 | if (b->xid != ic_dev_xid) { | |
985 | if (net_ratelimit()) | |
986 | printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n"); | |
987 | goto drop_unlock; | |
988 | } | |
989 | ||
990 | /* Parse extensions */ | |
991 | if (ext_len >= 4 && | |
992 | !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ | |
993 | u8 *end = (u8 *) b + ntohs(b->iph.tot_len); | |
994 | u8 *ext; | |
995 | ||
996 | #ifdef IPCONFIG_DHCP | |
997 | if (ic_proto_enabled & IC_USE_DHCP) { | |
998 | __be32 server_id = NONE; | |
999 | int mt = 0; | |
1000 | ||
1001 | ext = &b->exten[4]; | |
1002 | while (ext < end && *ext != 0xff) { | |
1003 | u8 *opt = ext++; | |
1004 | if (*opt == 0) /* Padding */ | |
1005 | continue; | |
1006 | ext += *ext + 1; | |
1007 | if (ext >= end) | |
1008 | break; | |
1009 | switch (*opt) { | |
1010 | case 53: /* Message type */ | |
1011 | if (opt[1]) | |
1012 | mt = opt[2]; | |
1013 | break; | |
1014 | case 54: /* Server ID (IP address) */ | |
1015 | if (opt[1] >= 4) | |
1016 | memcpy(&server_id, opt + 2, 4); | |
1017 | break; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | #ifdef IPCONFIG_DEBUG | |
1022 | printk("DHCP: Got message type %d\n", mt); | |
1023 | #endif | |
1024 | ||
1025 | switch (mt) { | |
1026 | case DHCPOFFER: | |
1027 | /* While in the process of accepting one offer, | |
1028 | * ignore all others. | |
1029 | */ | |
1030 | if (ic_myaddr != NONE) | |
1031 | goto drop_unlock; | |
1032 | ||
1033 | /* Let's accept that offer. */ | |
1034 | ic_myaddr = b->your_ip; | |
1035 | ic_servaddr = server_id; | |
1036 | #ifdef IPCONFIG_DEBUG | |
1037 | printk("DHCP: Offered address %pI4 by server %pI4\n", | |
1038 | &ic_myaddr, &ic_servaddr); | |
1039 | #endif | |
1040 | /* The DHCP indicated server address takes | |
1041 | * precedence over the bootp header one if | |
1042 | * they are different. | |
1043 | */ | |
1044 | if ((server_id != NONE) && | |
1045 | (b->server_ip != server_id)) | |
1046 | b->server_ip = ic_servaddr; | |
1047 | break; | |
1048 | ||
1049 | case DHCPACK: | |
1050 | if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) | |
1051 | goto drop_unlock; | |
1052 | ||
1053 | /* Yeah! */ | |
1054 | break; | |
1055 | ||
1056 | default: | |
1057 | /* Urque. Forget it*/ | |
1058 | ic_myaddr = NONE; | |
1059 | ic_servaddr = NONE; | |
1060 | goto drop_unlock; | |
1061 | } | |
1062 | ||
1063 | ic_dhcp_msgtype = mt; | |
1064 | ||
1065 | } | |
1066 | #endif /* IPCONFIG_DHCP */ | |
1067 | ||
1068 | ext = &b->exten[4]; | |
1069 | while (ext < end && *ext != 0xff) { | |
1070 | u8 *opt = ext++; | |
1071 | if (*opt == 0) /* Padding */ | |
1072 | continue; | |
1073 | ext += *ext + 1; | |
1074 | if (ext < end) | |
1075 | ic_do_bootp_ext(opt); | |
1076 | } | |
1077 | } | |
1078 | ||
1079 | /* We have a winner! */ | |
1080 | ic_dev = dev; | |
1081 | ic_myaddr = b->your_ip; | |
1082 | ic_servaddr = b->server_ip; | |
1083 | if (ic_gateway == NONE && b->relay_ip) | |
1084 | ic_gateway = b->relay_ip; | |
1085 | if (ic_nameservers[0] == NONE) | |
1086 | ic_nameservers[0] = ic_servaddr; | |
1087 | ic_got_reply = IC_BOOTP; | |
1088 | ||
1089 | drop_unlock: | |
1090 | /* Show's over. Nothing to see here. */ | |
1091 | spin_unlock(&ic_recv_lock); | |
1092 | ||
1093 | drop: | |
1094 | /* Throw the packet out. */ | |
1095 | kfree_skb(skb); | |
1096 | ||
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | ||
1101 | #endif | |
1102 | ||
1103 | ||
1104 | /* | |
1105 | * Dynamic IP configuration -- DHCP, BOOTP, RARP. | |
1106 | */ | |
1107 | ||
1108 | #ifdef IPCONFIG_DYNAMIC | |
1109 | ||
1110 | static int __init ic_dynamic(void) | |
1111 | { | |
1112 | int retries; | |
1113 | struct ic_device *d; | |
1114 | unsigned long start_jiffies, timeout, jiff; | |
1115 | int do_bootp = ic_proto_have_if & IC_BOOTP; | |
1116 | int do_rarp = ic_proto_have_if & IC_RARP; | |
1117 | ||
1118 | /* | |
1119 | * If none of DHCP/BOOTP/RARP was selected, return with an error. | |
1120 | * This routine gets only called when some pieces of information | |
1121 | * are missing, and without DHCP/BOOTP/RARP we are unable to get it. | |
1122 | */ | |
1123 | if (!ic_proto_enabled) { | |
1124 | printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); | |
1125 | return -1; | |
1126 | } | |
1127 | ||
1128 | #ifdef IPCONFIG_BOOTP | |
1129 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) | |
1130 | printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); | |
1131 | #endif | |
1132 | #ifdef IPCONFIG_RARP | |
1133 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) | |
1134 | printk(KERN_ERR "RARP: No suitable device found.\n"); | |
1135 | #endif | |
1136 | ||
1137 | if (!ic_proto_have_if) | |
1138 | /* Error message already printed */ | |
1139 | return -1; | |
1140 | ||
1141 | /* | |
1142 | * Setup protocols | |
1143 | */ | |
1144 | #ifdef IPCONFIG_BOOTP | |
1145 | if (do_bootp) | |
1146 | ic_bootp_init(); | |
1147 | #endif | |
1148 | #ifdef IPCONFIG_RARP | |
1149 | if (do_rarp) | |
1150 | ic_rarp_init(); | |
1151 | #endif | |
1152 | ||
1153 | /* | |
1154 | * Send requests and wait, until we get an answer. This loop | |
1155 | * seems to be a terrible waste of CPU time, but actually there is | |
1156 | * only one process running at all, so we don't need to use any | |
1157 | * scheduler functions. | |
1158 | * [Actually we could now, but the nothing else running note still | |
1159 | * applies.. - AC] | |
1160 | */ | |
1161 | printk(KERN_NOTICE "Sending %s%s%s requests .", | |
1162 | do_bootp | |
1163 | ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", | |
1164 | (do_bootp && do_rarp) ? " and " : "", | |
1165 | do_rarp ? "RARP" : ""); | |
1166 | ||
1167 | start_jiffies = jiffies; | |
1168 | d = ic_first_dev; | |
1169 | retries = CONF_SEND_RETRIES; | |
1170 | get_random_bytes(&timeout, sizeof(timeout)); | |
1171 | timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); | |
1172 | for (;;) { | |
1173 | /* Track the device we are configuring */ | |
1174 | ic_dev_xid = d->xid; | |
1175 | ||
1176 | #ifdef IPCONFIG_BOOTP | |
1177 | if (do_bootp && (d->able & IC_BOOTP)) | |
1178 | ic_bootp_send_if(d, jiffies - start_jiffies); | |
1179 | #endif | |
1180 | #ifdef IPCONFIG_RARP | |
1181 | if (do_rarp && (d->able & IC_RARP)) | |
1182 | ic_rarp_send_if(d); | |
1183 | #endif | |
1184 | ||
1185 | jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); | |
1186 | while (time_before(jiffies, jiff) && !ic_got_reply) | |
1187 | schedule_timeout_uninterruptible(1); | |
1188 | #ifdef IPCONFIG_DHCP | |
1189 | /* DHCP isn't done until we get a DHCPACK. */ | |
1190 | if ((ic_got_reply & IC_BOOTP) && | |
1191 | (ic_proto_enabled & IC_USE_DHCP) && | |
1192 | ic_dhcp_msgtype != DHCPACK) { | |
1193 | ic_got_reply = 0; | |
1194 | printk(","); | |
1195 | continue; | |
1196 | } | |
1197 | #endif /* IPCONFIG_DHCP */ | |
1198 | ||
1199 | if (ic_got_reply) { | |
1200 | printk(" OK\n"); | |
1201 | break; | |
1202 | } | |
1203 | ||
1204 | if ((d = d->next)) | |
1205 | continue; | |
1206 | ||
1207 | if (! --retries) { | |
1208 | printk(" timed out!\n"); | |
1209 | break; | |
1210 | } | |
1211 | ||
1212 | d = ic_first_dev; | |
1213 | ||
1214 | timeout = timeout CONF_TIMEOUT_MULT; | |
1215 | if (timeout > CONF_TIMEOUT_MAX) | |
1216 | timeout = CONF_TIMEOUT_MAX; | |
1217 | ||
1218 | printk("."); | |
1219 | } | |
1220 | ||
1221 | #ifdef IPCONFIG_BOOTP | |
1222 | if (do_bootp) | |
1223 | ic_bootp_cleanup(); | |
1224 | #endif | |
1225 | #ifdef IPCONFIG_RARP | |
1226 | if (do_rarp) | |
1227 | ic_rarp_cleanup(); | |
1228 | #endif | |
1229 | ||
1230 | if (!ic_got_reply) { | |
1231 | ic_myaddr = NONE; | |
1232 | return -1; | |
1233 | } | |
1234 | ||
1235 | printk("IP-Config: Got %s answer from %pI4, ", | |
1236 | ((ic_got_reply & IC_RARP) ? "RARP" | |
1237 | : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), | |
1238 | &ic_servaddr); | |
1239 | printk("my address is %pI4\n", &ic_myaddr); | |
1240 | ||
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | #endif /* IPCONFIG_DYNAMIC */ | |
1245 | ||
1246 | #ifdef CONFIG_PROC_FS | |
1247 | ||
1248 | static int pnp_seq_show(struct seq_file *seq, void *v) | |
1249 | { | |
1250 | int i; | |
1251 | ||
1252 | if (ic_proto_used & IC_PROTO) | |
1253 | seq_printf(seq, "#PROTO: %s\n", | |
1254 | (ic_proto_used & IC_RARP) ? "RARP" | |
1255 | : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); | |
1256 | else | |
1257 | seq_puts(seq, "#MANUAL\n"); | |
1258 | ||
1259 | if (ic_domain[0]) | |
1260 | seq_printf(seq, | |
1261 | "domain %s\n", ic_domain); | |
1262 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { | |
1263 | if (ic_nameservers[i] != NONE) | |
1264 | seq_printf(seq, "nameserver %pI4\n", | |
1265 | &ic_nameservers[i]); | |
1266 | } | |
1267 | if (ic_servaddr != NONE) | |
1268 | seq_printf(seq, "bootserver %pI4\n", | |
1269 | &ic_servaddr); | |
1270 | return 0; | |
1271 | } | |
1272 | ||
1273 | static int pnp_seq_open(struct inode *indoe, struct file *file) | |
1274 | { | |
1275 | return single_open(file, pnp_seq_show, NULL); | |
1276 | } | |
1277 | ||
1278 | static const struct file_operations pnp_seq_fops = { | |
1279 | .owner = THIS_MODULE, | |
1280 | .open = pnp_seq_open, | |
1281 | .read = seq_read, | |
1282 | .llseek = seq_lseek, | |
1283 | .release = single_release, | |
1284 | }; | |
1285 | #endif /* CONFIG_PROC_FS */ | |
1286 | ||
1287 | /* | |
1288 | * Extract IP address from the parameter string if needed. Note that we | |
1289 | * need to have root_server_addr set _before_ IPConfig gets called as it | |
1290 | * can override it. | |
1291 | */ | |
1292 | __be32 __init root_nfs_parse_addr(char *name) | |
1293 | { | |
1294 | __be32 addr; | |
1295 | int octets = 0; | |
1296 | char *cp, *cq; | |
1297 | ||
1298 | cp = cq = name; | |
1299 | while (octets < 4) { | |
1300 | while (*cp >= '0' && *cp <= '9') | |
1301 | cp++; | |
1302 | if (cp == cq || cp - cq > 3) | |
1303 | break; | |
1304 | if (*cp == '.' || octets == 3) | |
1305 | octets++; | |
1306 | if (octets < 4) | |
1307 | cp++; | |
1308 | cq = cp; | |
1309 | } | |
1310 | if (octets == 4 && (*cp == ':' || *cp == '\0')) { | |
1311 | if (*cp == ':') | |
1312 | *cp++ = '\0'; | |
1313 | addr = in_aton(name); | |
1314 | memmove(name, cp, strlen(cp) + 1); | |
1315 | } else | |
1316 | addr = NONE; | |
1317 | ||
1318 | return addr; | |
1319 | } | |
1320 | ||
1321 | #define DEVICE_WAIT_MAX 12 /* 12 seconds */ | |
1322 | ||
1323 | static int __init wait_for_devices(void) | |
1324 | { | |
1325 | int i; | |
1326 | ||
1327 | msleep(CONF_PRE_OPEN); | |
1328 | for (i = 0; i < DEVICE_WAIT_MAX; i++) { | |
1329 | struct net_device *dev; | |
1330 | int found = 0; | |
1331 | ||
1332 | rtnl_lock(); | |
1333 | for_each_netdev(&init_net, dev) { | |
1334 | if (ic_device_match(dev)) { | |
1335 | found = 1; | |
1336 | break; | |
1337 | } | |
1338 | } | |
1339 | rtnl_unlock(); | |
1340 | if (found) | |
1341 | return 0; | |
1342 | ssleep(1); | |
1343 | } | |
1344 | return -ENODEV; | |
1345 | } | |
1346 | ||
1347 | /* | |
1348 | * IP Autoconfig dispatcher. | |
1349 | */ | |
1350 | ||
1351 | static int __init ip_auto_config(void) | |
1352 | { | |
1353 | __be32 addr; | |
1354 | #ifdef IPCONFIG_DYNAMIC | |
1355 | int retries = CONF_OPEN_RETRIES; | |
1356 | #endif | |
1357 | int err; | |
1358 | ||
1359 | #ifdef CONFIG_PROC_FS | |
1360 | proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); | |
1361 | #endif /* CONFIG_PROC_FS */ | |
1362 | ||
1363 | if (!ic_enable) | |
1364 | return 0; | |
1365 | ||
1366 | DBG(("IP-Config: Entered.\n")); | |
1367 | #ifdef IPCONFIG_DYNAMIC | |
1368 | try_try_again: | |
1369 | #endif | |
1370 | /* Wait for devices to appear */ | |
1371 | err = wait_for_devices(); | |
1372 | if (err) | |
1373 | return err; | |
1374 | ||
1375 | /* Setup all network devices */ | |
1376 | err = ic_open_devs(); | |
1377 | if (err) | |
1378 | return err; | |
1379 | ||
1380 | /* Give drivers a chance to settle */ | |
1381 | ssleep(CONF_POST_OPEN); | |
1382 | ||
1383 | /* | |
1384 | * If the config information is insufficient (e.g., our IP address or | |
1385 | * IP address of the boot server is missing or we have multiple network | |
1386 | * interfaces and no default was set), use BOOTP or RARP to get the | |
1387 | * missing values. | |
1388 | */ | |
1389 | if (ic_myaddr == NONE || | |
1390 | #ifdef CONFIG_ROOT_NFS | |
1391 | (root_server_addr == NONE && | |
1392 | ic_servaddr == NONE && | |
1393 | ROOT_DEV == Root_NFS) || | |
1394 | #endif | |
1395 | ic_first_dev->next) { | |
1396 | #ifdef IPCONFIG_DYNAMIC | |
1397 | if (ic_dynamic() < 0) { | |
1398 | ic_close_devs(); | |
1399 | ||
1400 | /* | |
1401 | * I don't know why, but sometimes the | |
1402 | * eepro100 driver (at least) gets upset and | |
1403 | * doesn't work the first time it's opened. | |
1404 | * But then if you close it and reopen it, it | |
1405 | * works just fine. So we need to try that at | |
1406 | * least once before giving up. | |
1407 | * | |
1408 | * Also, if the root will be NFS-mounted, we | |
1409 | * have nowhere to go if DHCP fails. So we | |
1410 | * just have to keep trying forever. | |
1411 | * | |
1412 | * -- Chip | |
1413 | */ | |
1414 | #ifdef CONFIG_ROOT_NFS | |
1415 | if (ROOT_DEV == Root_NFS) { | |
1416 | printk(KERN_ERR | |
1417 | "IP-Config: Retrying forever (NFS root)...\n"); | |
1418 | goto try_try_again; | |
1419 | } | |
1420 | #endif | |
1421 | ||
1422 | if (--retries) { | |
1423 | printk(KERN_ERR | |
1424 | "IP-Config: Reopening network devices...\n"); | |
1425 | goto try_try_again; | |
1426 | } | |
1427 | ||
1428 | /* Oh, well. At least we tried. */ | |
1429 | printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); | |
1430 | return -1; | |
1431 | } | |
1432 | #else /* !DYNAMIC */ | |
1433 | printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); | |
1434 | ic_close_devs(); | |
1435 | return -1; | |
1436 | #endif /* IPCONFIG_DYNAMIC */ | |
1437 | } else { | |
1438 | /* Device selected manually or only one device -> use it */ | |
1439 | ic_dev = ic_first_dev->dev; | |
1440 | } | |
1441 | ||
1442 | addr = root_nfs_parse_addr(root_server_path); | |
1443 | if (root_server_addr == NONE) | |
1444 | root_server_addr = addr; | |
1445 | ||
1446 | /* | |
1447 | * Use defaults whereever applicable. | |
1448 | */ | |
1449 | if (ic_defaults() < 0) | |
1450 | return -1; | |
1451 | ||
1452 | /* | |
1453 | * Close all network devices except the device we've | |
1454 | * autoconfigured and set up routes. | |
1455 | */ | |
1456 | ic_close_devs(); | |
1457 | if (ic_setup_if() < 0 || ic_setup_routes() < 0) | |
1458 | return -1; | |
1459 | ||
1460 | /* | |
1461 | * Record which protocol was actually used. | |
1462 | */ | |
1463 | #ifdef IPCONFIG_DYNAMIC | |
1464 | ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); | |
1465 | #endif | |
1466 | ||
1467 | #ifndef IPCONFIG_SILENT | |
1468 | /* | |
1469 | * Clue in the operator. | |
1470 | */ | |
1471 | printk("IP-Config: Complete:"); | |
1472 | printk("\n device=%s", ic_dev->name); | |
1473 | printk(", addr=%pI4", &ic_myaddr); | |
1474 | printk(", mask=%pI4", &ic_netmask); | |
1475 | printk(", gw=%pI4", &ic_gateway); | |
1476 | printk(",\n host=%s, domain=%s, nis-domain=%s", | |
1477 | utsname()->nodename, ic_domain, utsname()->domainname); | |
1478 | printk(",\n bootserver=%pI4", &ic_servaddr); | |
1479 | printk(", rootserver=%pI4", &root_server_addr); | |
1480 | printk(", rootpath=%s", root_server_path); | |
1481 | if (ic_dev_mtu) | |
1482 | printk(", mtu=%d", ic_dev_mtu); | |
1483 | printk("\n"); | |
1484 | #endif /* !SILENT */ | |
1485 | ||
1486 | return 0; | |
1487 | } | |
1488 | ||
1489 | late_initcall(ip_auto_config); | |
1490 | ||
1491 | ||
1492 | /* | |
1493 | * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel | |
1494 | * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. | |
1495 | */ | |
1496 | static int __init ic_proto_name(char *name) | |
1497 | { | |
1498 | if (!strcmp(name, "on") || !strcmp(name, "any")) { | |
1499 | return 1; | |
1500 | } | |
1501 | if (!strcmp(name, "off") || !strcmp(name, "none")) { | |
1502 | return 0; | |
1503 | } | |
1504 | #ifdef CONFIG_IP_PNP_DHCP | |
1505 | else if (!strcmp(name, "dhcp")) { | |
1506 | ic_proto_enabled &= ~IC_RARP; | |
1507 | return 1; | |
1508 | } | |
1509 | #endif | |
1510 | #ifdef CONFIG_IP_PNP_BOOTP | |
1511 | else if (!strcmp(name, "bootp")) { | |
1512 | ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); | |
1513 | return 1; | |
1514 | } | |
1515 | #endif | |
1516 | #ifdef CONFIG_IP_PNP_RARP | |
1517 | else if (!strcmp(name, "rarp")) { | |
1518 | ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); | |
1519 | return 1; | |
1520 | } | |
1521 | #endif | |
1522 | #ifdef IPCONFIG_DYNAMIC | |
1523 | else if (!strcmp(name, "both")) { | |
1524 | ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ | |
1525 | return 1; | |
1526 | } | |
1527 | #endif | |
1528 | return 0; | |
1529 | } | |
1530 | ||
1531 | static int __init ip_auto_config_setup(char *addrs) | |
1532 | { | |
1533 | char *cp, *ip, *dp; | |
1534 | int num = 0; | |
1535 | ||
1536 | ic_set_manually = 1; | |
1537 | ic_enable = 1; | |
1538 | ||
1539 | /* | |
1540 | * If any dhcp, bootp etc options are set, leave autoconfig on | |
1541 | * and skip the below static IP processing. | |
1542 | */ | |
1543 | if (ic_proto_name(addrs)) | |
1544 | return 1; | |
1545 | ||
1546 | /* If no static IP is given, turn off autoconfig and bail. */ | |
1547 | if (*addrs == 0 || | |
1548 | strcmp(addrs, "off") == 0 || | |
1549 | strcmp(addrs, "none") == 0) { | |
1550 | ic_enable = 0; | |
1551 | return 1; | |
1552 | } | |
1553 | ||
1554 | /* Parse string for static IP assignment. */ | |
1555 | ip = addrs; | |
1556 | while (ip && *ip) { | |
1557 | if ((cp = strchr(ip, ':'))) | |
1558 | *cp++ = '\0'; | |
1559 | if (strlen(ip) > 0) { | |
1560 | DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); | |
1561 | switch (num) { | |
1562 | case 0: | |
1563 | if ((ic_myaddr = in_aton(ip)) == ANY) | |
1564 | ic_myaddr = NONE; | |
1565 | break; | |
1566 | case 1: | |
1567 | if ((ic_servaddr = in_aton(ip)) == ANY) | |
1568 | ic_servaddr = NONE; | |
1569 | break; | |
1570 | case 2: | |
1571 | if ((ic_gateway = in_aton(ip)) == ANY) | |
1572 | ic_gateway = NONE; | |
1573 | break; | |
1574 | case 3: | |
1575 | if ((ic_netmask = in_aton(ip)) == ANY) | |
1576 | ic_netmask = NONE; | |
1577 | break; | |
1578 | case 4: | |
1579 | if ((dp = strchr(ip, '.'))) { | |
1580 | *dp++ = '\0'; | |
1581 | strlcpy(utsname()->domainname, dp, | |
1582 | sizeof(utsname()->domainname)); | |
1583 | } | |
1584 | strlcpy(utsname()->nodename, ip, | |
1585 | sizeof(utsname()->nodename)); | |
1586 | ic_host_name_set = 1; | |
1587 | break; | |
1588 | case 5: | |
1589 | strlcpy(user_dev_name, ip, sizeof(user_dev_name)); | |
1590 | break; | |
1591 | case 6: | |
1592 | if (ic_proto_name(ip) == 0 && | |
1593 | ic_myaddr == NONE) { | |
1594 | ic_enable = 0; | |
1595 | } | |
1596 | break; | |
1597 | } | |
1598 | } | |
1599 | ip = cp; | |
1600 | num++; | |
1601 | } | |
1602 | ||
1603 | return 1; | |
1604 | } | |
1605 | ||
1606 | static int __init nfsaddrs_config_setup(char *addrs) | |
1607 | { | |
1608 | return ip_auto_config_setup(addrs); | |
1609 | } | |
1610 | ||
1611 | static int __init vendor_class_identifier_setup(char *addrs) | |
1612 | { | |
1613 | if (strlcpy(vendor_class_identifier, addrs, | |
1614 | sizeof(vendor_class_identifier)) | |
1615 | >= sizeof(vendor_class_identifier)) | |
1616 | printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", | |
1617 | vendor_class_identifier); | |
1618 | return 1; | |
1619 | } | |
1620 | ||
1621 | __setup("ip=", ip_auto_config_setup); | |
1622 | __setup("nfsaddrs=", nfsaddrs_config_setup); | |
1623 | __setup("dhcpclass=", vendor_class_identifier_setup); |