Root/
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 <linux/export.h> |
58 | #include <net/net_namespace.h> |
59 | #include <net/arp.h> |
60 | #include <net/ip.h> |
61 | #include <net/ipconfig.h> |
62 | #include <net/route.h> |
63 | |
64 | #include <asm/uaccess.h> |
65 | #include <net/checksum.h> |
66 | #include <asm/processor.h> |
67 | |
68 | /* Define this to allow debugging output */ |
69 | #undef IPCONFIG_DEBUG |
70 | |
71 | #ifdef IPCONFIG_DEBUG |
72 | #define DBG(x) printk x |
73 | #else |
74 | #define DBG(x) do { } while(0) |
75 | #endif |
76 | |
77 | #if defined(CONFIG_IP_PNP_DHCP) |
78 | #define IPCONFIG_DHCP |
79 | #endif |
80 | #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) |
81 | #define IPCONFIG_BOOTP |
82 | #endif |
83 | #if defined(CONFIG_IP_PNP_RARP) |
84 | #define IPCONFIG_RARP |
85 | #endif |
86 | #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) |
87 | #define IPCONFIG_DYNAMIC |
88 | #endif |
89 | |
90 | /* Define the friendly delay before and after opening net devices */ |
91 | #define CONF_POST_OPEN 10 /* After opening: 10 msecs */ |
92 | #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */ |
93 | |
94 | /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ |
95 | #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ |
96 | #define CONF_SEND_RETRIES 6 /* Send six requests per open */ |
97 | #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ |
98 | #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ |
99 | #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ |
100 | #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ |
101 | #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ |
102 | #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers |
103 | - '3' from resolv.h */ |
104 | |
105 | #define NONE cpu_to_be32(INADDR_NONE) |
106 | #define ANY cpu_to_be32(INADDR_ANY) |
107 | |
108 | /* |
109 | * Public IP configuration |
110 | */ |
111 | |
112 | /* This is used by platforms which might be able to set the ipconfig |
113 | * variables using firmware environment vars. If this is set, it will |
114 | * ignore such firmware variables. |
115 | */ |
116 | int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ |
117 | |
118 | static int ic_enable __initdata = 0; /* IP config enabled? */ |
119 | |
120 | /* Protocol choice */ |
121 | int ic_proto_enabled __initdata = 0 |
122 | #ifdef IPCONFIG_BOOTP |
123 | | IC_BOOTP |
124 | #endif |
125 | #ifdef CONFIG_IP_PNP_DHCP |
126 | | IC_USE_DHCP |
127 | #endif |
128 | #ifdef IPCONFIG_RARP |
129 | | IC_RARP |
130 | #endif |
131 | ; |
132 | |
133 | static int ic_host_name_set __initdata = 0; /* Host name set by us? */ |
134 | |
135 | __be32 ic_myaddr = NONE; /* My IP address */ |
136 | static __be32 ic_netmask = NONE; /* Netmask for local subnet */ |
137 | __be32 ic_gateway = NONE; /* Gateway IP address */ |
138 | |
139 | __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ |
140 | |
141 | __be32 ic_servaddr = NONE; /* Boot server IP address */ |
142 | |
143 | __be32 root_server_addr = NONE; /* Address of NFS server */ |
144 | u8 root_server_path[256] = { 0, }; /* Path to mount as root */ |
145 | |
146 | __be32 ic_dev_xid; /* Device under configuration */ |
147 | |
148 | /* vendor class identifier */ |
149 | static char vendor_class_identifier[253] __initdata; |
150 | |
151 | /* Persistent data: */ |
152 | |
153 | static int ic_proto_used; /* Protocol used, if any */ |
154 | static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ |
155 | static u8 ic_domain[64]; /* DNS (not NIS) domain name */ |
156 | |
157 | /* |
158 | * Private state. |
159 | */ |
160 | |
161 | /* Name of user-selected boot device */ |
162 | static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; |
163 | |
164 | /* Protocols supported by available interfaces */ |
165 | static int ic_proto_have_if __initdata = 0; |
166 | |
167 | /* MTU for boot device */ |
168 | static int ic_dev_mtu __initdata = 0; |
169 | |
170 | #ifdef IPCONFIG_DYNAMIC |
171 | static DEFINE_SPINLOCK(ic_recv_lock); |
172 | static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ |
173 | #endif |
174 | #ifdef IPCONFIG_DHCP |
175 | static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ |
176 | #endif |
177 | |
178 | |
179 | /* |
180 | * Network devices |
181 | */ |
182 | |
183 | struct ic_device { |
184 | struct ic_device *next; |
185 | struct net_device *dev; |
186 | unsigned short flags; |
187 | short able; |
188 | __be32 xid; |
189 | }; |
190 | |
191 | static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ |
192 | static struct net_device *ic_dev __initdata = NULL; /* Selected device */ |
193 | |
194 | static bool __init ic_is_init_dev(struct net_device *dev) |
195 | { |
196 | if (dev->flags & IFF_LOOPBACK) |
197 | return false; |
198 | return 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 | } |
203 | |
204 | static int __init ic_open_devs(void) |
205 | { |
206 | struct ic_device *d, **last; |
207 | struct net_device *dev; |
208 | unsigned short oflags; |
209 | unsigned long start; |
210 | |
211 | last = &ic_first_dev; |
212 | rtnl_lock(); |
213 | |
214 | /* bring loopback device up first */ |
215 | for_each_netdev(&init_net, dev) { |
216 | if (!(dev->flags & IFF_LOOPBACK)) |
217 | continue; |
218 | if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) |
219 | pr_err("IP-Config: Failed to open %s\n", dev->name); |
220 | } |
221 | |
222 | for_each_netdev(&init_net, dev) { |
223 | if (ic_is_init_dev(dev)) { |
224 | int able = 0; |
225 | if (dev->mtu >= 364) |
226 | able |= IC_BOOTP; |
227 | else |
228 | pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small", |
229 | dev->name, dev->mtu); |
230 | if (!(dev->flags & IFF_NOARP)) |
231 | able |= IC_RARP; |
232 | able &= ic_proto_enabled; |
233 | if (ic_proto_enabled && !able) |
234 | continue; |
235 | oflags = dev->flags; |
236 | if (dev_change_flags(dev, oflags | IFF_UP) < 0) { |
237 | pr_err("IP-Config: Failed to open %s\n", |
238 | dev->name); |
239 | continue; |
240 | } |
241 | if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { |
242 | rtnl_unlock(); |
243 | return -ENOMEM; |
244 | } |
245 | d->dev = dev; |
246 | *last = d; |
247 | last = &d->next; |
248 | d->flags = oflags; |
249 | d->able = able; |
250 | if (able & IC_BOOTP) |
251 | get_random_bytes(&d->xid, sizeof(__be32)); |
252 | else |
253 | d->xid = 0; |
254 | ic_proto_have_if |= able; |
255 | DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", |
256 | dev->name, able, d->xid)); |
257 | } |
258 | } |
259 | |
260 | /* no point in waiting if we could not bring up at least one device */ |
261 | if (!ic_first_dev) |
262 | goto have_carrier; |
263 | |
264 | /* wait for a carrier on at least one device */ |
265 | start = jiffies; |
266 | while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) { |
267 | for_each_netdev(&init_net, dev) |
268 | if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) |
269 | goto have_carrier; |
270 | |
271 | msleep(1); |
272 | } |
273 | have_carrier: |
274 | rtnl_unlock(); |
275 | |
276 | *last = NULL; |
277 | |
278 | if (!ic_first_dev) { |
279 | if (user_dev_name[0]) |
280 | pr_err("IP-Config: Device `%s' not found\n", |
281 | user_dev_name); |
282 | else |
283 | pr_err("IP-Config: No network devices available\n"); |
284 | return -ENODEV; |
285 | } |
286 | return 0; |
287 | } |
288 | |
289 | static void __init ic_close_devs(void) |
290 | { |
291 | struct ic_device *d, *next; |
292 | struct net_device *dev; |
293 | |
294 | rtnl_lock(); |
295 | next = ic_first_dev; |
296 | while ((d = next)) { |
297 | next = d->next; |
298 | dev = d->dev; |
299 | if (dev != ic_dev) { |
300 | DBG(("IP-Config: Downing %s\n", dev->name)); |
301 | dev_change_flags(dev, d->flags); |
302 | } |
303 | kfree(d); |
304 | } |
305 | rtnl_unlock(); |
306 | } |
307 | |
308 | /* |
309 | * Interface to various network functions. |
310 | */ |
311 | |
312 | static inline void |
313 | set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) |
314 | { |
315 | sin->sin_family = AF_INET; |
316 | sin->sin_addr.s_addr = addr; |
317 | sin->sin_port = port; |
318 | } |
319 | |
320 | static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) |
321 | { |
322 | int res; |
323 | |
324 | mm_segment_t oldfs = get_fs(); |
325 | set_fs(get_ds()); |
326 | res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); |
327 | set_fs(oldfs); |
328 | return res; |
329 | } |
330 | |
331 | static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) |
332 | { |
333 | int res; |
334 | |
335 | mm_segment_t oldfs = get_fs(); |
336 | set_fs(get_ds()); |
337 | res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); |
338 | set_fs(oldfs); |
339 | return res; |
340 | } |
341 | |
342 | static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) |
343 | { |
344 | int res; |
345 | |
346 | mm_segment_t oldfs = get_fs(); |
347 | set_fs(get_ds()); |
348 | res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); |
349 | set_fs(oldfs); |
350 | return res; |
351 | } |
352 | |
353 | /* |
354 | * Set up interface addresses and routes. |
355 | */ |
356 | |
357 | static int __init ic_setup_if(void) |
358 | { |
359 | struct ifreq ir; |
360 | struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; |
361 | int err; |
362 | |
363 | memset(&ir, 0, sizeof(ir)); |
364 | strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); |
365 | set_sockaddr(sin, ic_myaddr, 0); |
366 | if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { |
367 | pr_err("IP-Config: Unable to set interface address (%d)\n", |
368 | err); |
369 | return -1; |
370 | } |
371 | set_sockaddr(sin, ic_netmask, 0); |
372 | if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { |
373 | pr_err("IP-Config: Unable to set interface netmask (%d)\n", |
374 | err); |
375 | return -1; |
376 | } |
377 | set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); |
378 | if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { |
379 | pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", |
380 | err); |
381 | return -1; |
382 | } |
383 | /* Handle the case where we need non-standard MTU on the boot link (a network |
384 | * using jumbo frames, for instance). If we can't set the mtu, don't error |
385 | * out, we'll try to muddle along. |
386 | */ |
387 | if (ic_dev_mtu != 0) { |
388 | strcpy(ir.ifr_name, ic_dev->name); |
389 | ir.ifr_mtu = ic_dev_mtu; |
390 | if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) |
391 | pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", |
392 | ic_dev_mtu, err); |
393 | } |
394 | return 0; |
395 | } |
396 | |
397 | static int __init ic_setup_routes(void) |
398 | { |
399 | /* No need to setup device routes, only the default route... */ |
400 | |
401 | if (ic_gateway != NONE) { |
402 | struct rtentry rm; |
403 | int err; |
404 | |
405 | memset(&rm, 0, sizeof(rm)); |
406 | if ((ic_gateway ^ ic_myaddr) & ic_netmask) { |
407 | pr_err("IP-Config: Gateway not on directly connected network\n"); |
408 | return -1; |
409 | } |
410 | set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); |
411 | set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); |
412 | set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); |
413 | rm.rt_flags = RTF_UP | RTF_GATEWAY; |
414 | if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { |
415 | pr_err("IP-Config: Cannot add default route (%d)\n", |
416 | err); |
417 | return -1; |
418 | } |
419 | } |
420 | |
421 | return 0; |
422 | } |
423 | |
424 | /* |
425 | * Fill in default values for all missing parameters. |
426 | */ |
427 | |
428 | static int __init ic_defaults(void) |
429 | { |
430 | /* |
431 | * At this point we have no userspace running so need not |
432 | * claim locks on system_utsname |
433 | */ |
434 | |
435 | if (!ic_host_name_set) |
436 | sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); |
437 | |
438 | if (root_server_addr == NONE) |
439 | root_server_addr = ic_servaddr; |
440 | |
441 | if (ic_netmask == NONE) { |
442 | if (IN_CLASSA(ntohl(ic_myaddr))) |
443 | ic_netmask = htonl(IN_CLASSA_NET); |
444 | else if (IN_CLASSB(ntohl(ic_myaddr))) |
445 | ic_netmask = htonl(IN_CLASSB_NET); |
446 | else if (IN_CLASSC(ntohl(ic_myaddr))) |
447 | ic_netmask = htonl(IN_CLASSC_NET); |
448 | else { |
449 | pr_err("IP-Config: Unable to guess netmask for address %pI4\n", |
450 | &ic_myaddr); |
451 | return -1; |
452 | } |
453 | printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); |
454 | } |
455 | |
456 | return 0; |
457 | } |
458 | |
459 | /* |
460 | * RARP support. |
461 | */ |
462 | |
463 | #ifdef IPCONFIG_RARP |
464 | |
465 | static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
466 | |
467 | static struct packet_type rarp_packet_type __initdata = { |
468 | .type = cpu_to_be16(ETH_P_RARP), |
469 | .func = ic_rarp_recv, |
470 | }; |
471 | |
472 | static inline void __init ic_rarp_init(void) |
473 | { |
474 | dev_add_pack(&rarp_packet_type); |
475 | } |
476 | |
477 | static inline void __init ic_rarp_cleanup(void) |
478 | { |
479 | dev_remove_pack(&rarp_packet_type); |
480 | } |
481 | |
482 | /* |
483 | * Process received RARP packet. |
484 | */ |
485 | static int __init |
486 | ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
487 | { |
488 | struct arphdr *rarp; |
489 | unsigned char *rarp_ptr; |
490 | __be32 sip, tip; |
491 | unsigned char *sha, *tha; /* s for "source", t for "target" */ |
492 | struct ic_device *d; |
493 | |
494 | if (!net_eq(dev_net(dev), &init_net)) |
495 | goto drop; |
496 | |
497 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
498 | return NET_RX_DROP; |
499 | |
500 | if (!pskb_may_pull(skb, sizeof(struct arphdr))) |
501 | goto drop; |
502 | |
503 | /* Basic sanity checks can be done without the lock. */ |
504 | rarp = (struct arphdr *)skb_transport_header(skb); |
505 | |
506 | /* If this test doesn't pass, it's not IP, or we should |
507 | * ignore it anyway. |
508 | */ |
509 | if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) |
510 | goto drop; |
511 | |
512 | /* If it's not a RARP reply, delete it. */ |
513 | if (rarp->ar_op != htons(ARPOP_RREPLY)) |
514 | goto drop; |
515 | |
516 | /* If it's not Ethernet, delete it. */ |
517 | if (rarp->ar_pro != htons(ETH_P_IP)) |
518 | goto drop; |
519 | |
520 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) |
521 | goto drop; |
522 | |
523 | /* OK, it is all there and looks valid, process... */ |
524 | rarp = (struct arphdr *)skb_transport_header(skb); |
525 | rarp_ptr = (unsigned char *) (rarp + 1); |
526 | |
527 | /* One reply at a time, please. */ |
528 | spin_lock(&ic_recv_lock); |
529 | |
530 | /* If we already have a reply, just drop the packet */ |
531 | if (ic_got_reply) |
532 | goto drop_unlock; |
533 | |
534 | /* Find the ic_device that the packet arrived on */ |
535 | d = ic_first_dev; |
536 | while (d && d->dev != dev) |
537 | d = d->next; |
538 | if (!d) |
539 | goto drop_unlock; /* should never happen */ |
540 | |
541 | /* Extract variable-width fields */ |
542 | sha = rarp_ptr; |
543 | rarp_ptr += dev->addr_len; |
544 | memcpy(&sip, rarp_ptr, 4); |
545 | rarp_ptr += 4; |
546 | tha = rarp_ptr; |
547 | rarp_ptr += dev->addr_len; |
548 | memcpy(&tip, rarp_ptr, 4); |
549 | |
550 | /* Discard packets which are not meant for us. */ |
551 | if (memcmp(tha, dev->dev_addr, dev->addr_len)) |
552 | goto drop_unlock; |
553 | |
554 | /* Discard packets which are not from specified server. */ |
555 | if (ic_servaddr != NONE && ic_servaddr != sip) |
556 | goto drop_unlock; |
557 | |
558 | /* We have a winner! */ |
559 | ic_dev = dev; |
560 | if (ic_myaddr == NONE) |
561 | ic_myaddr = tip; |
562 | ic_servaddr = sip; |
563 | ic_addrservaddr = sip; |
564 | ic_got_reply = IC_RARP; |
565 | |
566 | drop_unlock: |
567 | /* Show's over. Nothing to see here. */ |
568 | spin_unlock(&ic_recv_lock); |
569 | |
570 | drop: |
571 | /* Throw the packet out. */ |
572 | kfree_skb(skb); |
573 | return 0; |
574 | } |
575 | |
576 | |
577 | /* |
578 | * Send RARP request packet over a single interface. |
579 | */ |
580 | static void __init ic_rarp_send_if(struct ic_device *d) |
581 | { |
582 | struct net_device *dev = d->dev; |
583 | arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, |
584 | dev->dev_addr, dev->dev_addr); |
585 | } |
586 | #endif |
587 | |
588 | /* |
589 | * Predefine Nameservers |
590 | */ |
591 | static inline void __init ic_nameservers_predef(void) |
592 | { |
593 | int i; |
594 | |
595 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) |
596 | ic_nameservers[i] = NONE; |
597 | } |
598 | |
599 | /* |
600 | * DHCP/BOOTP support. |
601 | */ |
602 | |
603 | #ifdef IPCONFIG_BOOTP |
604 | |
605 | struct bootp_pkt { /* BOOTP packet format */ |
606 | struct iphdr iph; /* IP header */ |
607 | struct udphdr udph; /* UDP header */ |
608 | u8 op; /* 1=request, 2=reply */ |
609 | u8 htype; /* HW address type */ |
610 | u8 hlen; /* HW address length */ |
611 | u8 hops; /* Used only by gateways */ |
612 | __be32 xid; /* Transaction ID */ |
613 | __be16 secs; /* Seconds since we started */ |
614 | __be16 flags; /* Just what it says */ |
615 | __be32 client_ip; /* Client's IP address if known */ |
616 | __be32 your_ip; /* Assigned IP address */ |
617 | __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ |
618 | __be32 relay_ip; /* IP address of BOOTP relay */ |
619 | u8 hw_addr[16]; /* Client's HW address */ |
620 | u8 serv_name[64]; /* Server host name */ |
621 | u8 boot_file[128]; /* Name of boot file */ |
622 | u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ |
623 | }; |
624 | |
625 | /* packet ops */ |
626 | #define BOOTP_REQUEST 1 |
627 | #define BOOTP_REPLY 2 |
628 | |
629 | /* DHCP message types */ |
630 | #define DHCPDISCOVER 1 |
631 | #define DHCPOFFER 2 |
632 | #define DHCPREQUEST 3 |
633 | #define DHCPDECLINE 4 |
634 | #define DHCPACK 5 |
635 | #define DHCPNAK 6 |
636 | #define DHCPRELEASE 7 |
637 | #define DHCPINFORM 8 |
638 | |
639 | static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
640 | |
641 | static struct packet_type bootp_packet_type __initdata = { |
642 | .type = cpu_to_be16(ETH_P_IP), |
643 | .func = ic_bootp_recv, |
644 | }; |
645 | |
646 | |
647 | /* |
648 | * Initialize DHCP/BOOTP extension fields in the request. |
649 | */ |
650 | |
651 | static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; |
652 | |
653 | #ifdef IPCONFIG_DHCP |
654 | |
655 | static void __init |
656 | ic_dhcp_init_options(u8 *options) |
657 | { |
658 | u8 mt = ((ic_servaddr == NONE) |
659 | ? DHCPDISCOVER : DHCPREQUEST); |
660 | u8 *e = options; |
661 | int len; |
662 | |
663 | #ifdef IPCONFIG_DEBUG |
664 | printk("DHCP: Sending message type %d\n", mt); |
665 | #endif |
666 | |
667 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ |
668 | e += 4; |
669 | |
670 | *e++ = 53; /* DHCP message type */ |
671 | *e++ = 1; |
672 | *e++ = mt; |
673 | |
674 | if (mt == DHCPREQUEST) { |
675 | *e++ = 54; /* Server ID (IP address) */ |
676 | *e++ = 4; |
677 | memcpy(e, &ic_servaddr, 4); |
678 | e += 4; |
679 | |
680 | *e++ = 50; /* Requested IP address */ |
681 | *e++ = 4; |
682 | memcpy(e, &ic_myaddr, 4); |
683 | e += 4; |
684 | } |
685 | |
686 | /* always? */ |
687 | { |
688 | static const u8 ic_req_params[] = { |
689 | 1, /* Subnet mask */ |
690 | 3, /* Default gateway */ |
691 | 6, /* DNS server */ |
692 | 12, /* Host name */ |
693 | 15, /* Domain name */ |
694 | 17, /* Boot path */ |
695 | 26, /* MTU */ |
696 | 40, /* NIS domain name */ |
697 | }; |
698 | |
699 | *e++ = 55; /* Parameter request list */ |
700 | *e++ = sizeof(ic_req_params); |
701 | memcpy(e, ic_req_params, sizeof(ic_req_params)); |
702 | e += sizeof(ic_req_params); |
703 | |
704 | if (ic_host_name_set) { |
705 | *e++ = 12; /* host-name */ |
706 | len = strlen(utsname()->nodename); |
707 | *e++ = len; |
708 | memcpy(e, utsname()->nodename, len); |
709 | e += len; |
710 | } |
711 | if (*vendor_class_identifier) { |
712 | pr_info("DHCP: sending class identifier \"%s\"\n", |
713 | vendor_class_identifier); |
714 | *e++ = 60; /* Class-identifier */ |
715 | len = strlen(vendor_class_identifier); |
716 | *e++ = len; |
717 | memcpy(e, vendor_class_identifier, len); |
718 | e += len; |
719 | } |
720 | } |
721 | |
722 | *e++ = 255; /* End of the list */ |
723 | } |
724 | |
725 | #endif /* IPCONFIG_DHCP */ |
726 | |
727 | static void __init ic_bootp_init_ext(u8 *e) |
728 | { |
729 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ |
730 | e += 4; |
731 | *e++ = 1; /* Subnet mask request */ |
732 | *e++ = 4; |
733 | e += 4; |
734 | *e++ = 3; /* Default gateway request */ |
735 | *e++ = 4; |
736 | e += 4; |
737 | *e++ = 5; /* Name server request */ |
738 | *e++ = 8; |
739 | e += 8; |
740 | *e++ = 12; /* Host name request */ |
741 | *e++ = 32; |
742 | e += 32; |
743 | *e++ = 40; /* NIS Domain name request */ |
744 | *e++ = 32; |
745 | e += 32; |
746 | *e++ = 17; /* Boot path */ |
747 | *e++ = 40; |
748 | e += 40; |
749 | |
750 | *e++ = 57; /* set extension buffer size for reply */ |
751 | *e++ = 2; |
752 | *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ |
753 | *e++ = 150; |
754 | |
755 | *e++ = 255; /* End of the list */ |
756 | } |
757 | |
758 | |
759 | /* |
760 | * Initialize the DHCP/BOOTP mechanism. |
761 | */ |
762 | static inline void __init ic_bootp_init(void) |
763 | { |
764 | ic_nameservers_predef(); |
765 | |
766 | dev_add_pack(&bootp_packet_type); |
767 | } |
768 | |
769 | |
770 | /* |
771 | * DHCP/BOOTP cleanup. |
772 | */ |
773 | static inline void __init ic_bootp_cleanup(void) |
774 | { |
775 | dev_remove_pack(&bootp_packet_type); |
776 | } |
777 | |
778 | |
779 | /* |
780 | * Send DHCP/BOOTP request to single interface. |
781 | */ |
782 | static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) |
783 | { |
784 | struct net_device *dev = d->dev; |
785 | struct sk_buff *skb; |
786 | struct bootp_pkt *b; |
787 | struct iphdr *h; |
788 | int hlen = LL_RESERVED_SPACE(dev); |
789 | int tlen = dev->needed_tailroom; |
790 | |
791 | /* Allocate packet */ |
792 | skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, |
793 | GFP_KERNEL); |
794 | if (!skb) |
795 | return; |
796 | skb_reserve(skb, hlen); |
797 | b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); |
798 | memset(b, 0, sizeof(struct bootp_pkt)); |
799 | |
800 | /* Construct IP header */ |
801 | skb_reset_network_header(skb); |
802 | h = ip_hdr(skb); |
803 | h->version = 4; |
804 | h->ihl = 5; |
805 | h->tot_len = htons(sizeof(struct bootp_pkt)); |
806 | h->frag_off = htons(IP_DF); |
807 | h->ttl = 64; |
808 | h->protocol = IPPROTO_UDP; |
809 | h->daddr = htonl(INADDR_BROADCAST); |
810 | h->check = ip_fast_csum((unsigned char *) h, h->ihl); |
811 | |
812 | /* Construct UDP header */ |
813 | b->udph.source = htons(68); |
814 | b->udph.dest = htons(67); |
815 | b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); |
816 | /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ |
817 | |
818 | /* Construct DHCP/BOOTP header */ |
819 | b->op = BOOTP_REQUEST; |
820 | if (dev->type < 256) /* check for false types */ |
821 | b->htype = dev->type; |
822 | else if (dev->type == ARPHRD_FDDI) |
823 | b->htype = ARPHRD_ETHER; |
824 | else { |
825 | printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); |
826 | b->htype = dev->type; /* can cause undefined behavior */ |
827 | } |
828 | |
829 | /* server_ip and your_ip address are both already zero per RFC2131 */ |
830 | b->hlen = dev->addr_len; |
831 | memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); |
832 | b->secs = htons(jiffies_diff / HZ); |
833 | b->xid = d->xid; |
834 | |
835 | /* add DHCP options or BOOTP extensions */ |
836 | #ifdef IPCONFIG_DHCP |
837 | if (ic_proto_enabled & IC_USE_DHCP) |
838 | ic_dhcp_init_options(b->exten); |
839 | else |
840 | #endif |
841 | ic_bootp_init_ext(b->exten); |
842 | |
843 | /* Chain packet down the line... */ |
844 | skb->dev = dev; |
845 | skb->protocol = htons(ETH_P_IP); |
846 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), |
847 | dev->broadcast, dev->dev_addr, skb->len) < 0) { |
848 | kfree_skb(skb); |
849 | printk("E"); |
850 | return; |
851 | } |
852 | |
853 | if (dev_queue_xmit(skb) < 0) |
854 | printk("E"); |
855 | } |
856 | |
857 | |
858 | /* |
859 | * Copy BOOTP-supplied string if not already set. |
860 | */ |
861 | static int __init ic_bootp_string(char *dest, char *src, int len, int max) |
862 | { |
863 | if (!len) |
864 | return 0; |
865 | if (len > max-1) |
866 | len = max-1; |
867 | memcpy(dest, src, len); |
868 | dest[len] = '\0'; |
869 | return 1; |
870 | } |
871 | |
872 | |
873 | /* |
874 | * Process BOOTP extensions. |
875 | */ |
876 | static void __init ic_do_bootp_ext(u8 *ext) |
877 | { |
878 | u8 servers; |
879 | int i; |
880 | __be16 mtu; |
881 | |
882 | #ifdef IPCONFIG_DEBUG |
883 | u8 *c; |
884 | |
885 | printk("DHCP/BOOTP: Got extension %d:",*ext); |
886 | for (c=ext+2; c<ext+2+ext[1]; c++) |
887 | printk(" %02x", *c); |
888 | printk("\n"); |
889 | #endif |
890 | |
891 | switch (*ext++) { |
892 | case 1: /* Subnet mask */ |
893 | if (ic_netmask == NONE) |
894 | memcpy(&ic_netmask, ext+1, 4); |
895 | break; |
896 | case 3: /* Default gateway */ |
897 | if (ic_gateway == NONE) |
898 | memcpy(&ic_gateway, ext+1, 4); |
899 | break; |
900 | case 6: /* DNS server */ |
901 | servers= *ext/4; |
902 | if (servers > CONF_NAMESERVERS_MAX) |
903 | servers = CONF_NAMESERVERS_MAX; |
904 | for (i = 0; i < servers; i++) { |
905 | if (ic_nameservers[i] == NONE) |
906 | memcpy(&ic_nameservers[i], ext+1+4*i, 4); |
907 | } |
908 | break; |
909 | case 12: /* Host name */ |
910 | ic_bootp_string(utsname()->nodename, ext+1, *ext, |
911 | __NEW_UTS_LEN); |
912 | ic_host_name_set = 1; |
913 | break; |
914 | case 15: /* Domain name (DNS) */ |
915 | ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); |
916 | break; |
917 | case 17: /* Root path */ |
918 | if (!root_server_path[0]) |
919 | ic_bootp_string(root_server_path, ext+1, *ext, |
920 | sizeof(root_server_path)); |
921 | break; |
922 | case 26: /* Interface MTU */ |
923 | memcpy(&mtu, ext+1, sizeof(mtu)); |
924 | ic_dev_mtu = ntohs(mtu); |
925 | break; |
926 | case 40: /* NIS Domain name (_not_ DNS) */ |
927 | ic_bootp_string(utsname()->domainname, ext+1, *ext, |
928 | __NEW_UTS_LEN); |
929 | break; |
930 | } |
931 | } |
932 | |
933 | |
934 | /* |
935 | * Receive BOOTP reply. |
936 | */ |
937 | static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
938 | { |
939 | struct bootp_pkt *b; |
940 | struct iphdr *h; |
941 | struct ic_device *d; |
942 | int len, ext_len; |
943 | |
944 | if (!net_eq(dev_net(dev), &init_net)) |
945 | goto drop; |
946 | |
947 | /* Perform verifications before taking the lock. */ |
948 | if (skb->pkt_type == PACKET_OTHERHOST) |
949 | goto drop; |
950 | |
951 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
952 | return NET_RX_DROP; |
953 | |
954 | if (!pskb_may_pull(skb, |
955 | sizeof(struct iphdr) + |
956 | sizeof(struct udphdr))) |
957 | goto drop; |
958 | |
959 | b = (struct bootp_pkt *)skb_network_header(skb); |
960 | h = &b->iph; |
961 | |
962 | if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) |
963 | goto drop; |
964 | |
965 | /* Fragments are not supported */ |
966 | if (ip_is_fragment(h)) { |
967 | net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); |
968 | goto drop; |
969 | } |
970 | |
971 | if (skb->len < ntohs(h->tot_len)) |
972 | goto drop; |
973 | |
974 | if (ip_fast_csum((char *) h, h->ihl)) |
975 | goto drop; |
976 | |
977 | if (b->udph.source != htons(67) || b->udph.dest != htons(68)) |
978 | goto drop; |
979 | |
980 | if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) |
981 | goto drop; |
982 | |
983 | len = ntohs(b->udph.len) - sizeof(struct udphdr); |
984 | ext_len = len - (sizeof(*b) - |
985 | sizeof(struct iphdr) - |
986 | sizeof(struct udphdr) - |
987 | sizeof(b->exten)); |
988 | if (ext_len < 0) |
989 | goto drop; |
990 | |
991 | /* Ok the front looks good, make sure we can get at the rest. */ |
992 | if (!pskb_may_pull(skb, skb->len)) |
993 | goto drop; |
994 | |
995 | b = (struct bootp_pkt *)skb_network_header(skb); |
996 | h = &b->iph; |
997 | |
998 | /* One reply at a time, please. */ |
999 | spin_lock(&ic_recv_lock); |
1000 | |
1001 | /* If we already have a reply, just drop the packet */ |
1002 | if (ic_got_reply) |
1003 | goto drop_unlock; |
1004 | |
1005 | /* Find the ic_device that the packet arrived on */ |
1006 | d = ic_first_dev; |
1007 | while (d && d->dev != dev) |
1008 | d = d->next; |
1009 | if (!d) |
1010 | goto drop_unlock; /* should never happen */ |
1011 | |
1012 | /* Is it a reply to our BOOTP request? */ |
1013 | if (b->op != BOOTP_REPLY || |
1014 | b->xid != d->xid) { |
1015 | net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n", |
1016 | b->op, b->xid); |
1017 | goto drop_unlock; |
1018 | } |
1019 | |
1020 | /* Is it a reply for the device we are configuring? */ |
1021 | if (b->xid != ic_dev_xid) { |
1022 | net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n"); |
1023 | goto drop_unlock; |
1024 | } |
1025 | |
1026 | /* Parse extensions */ |
1027 | if (ext_len >= 4 && |
1028 | !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ |
1029 | u8 *end = (u8 *) b + ntohs(b->iph.tot_len); |
1030 | u8 *ext; |
1031 | |
1032 | #ifdef IPCONFIG_DHCP |
1033 | if (ic_proto_enabled & IC_USE_DHCP) { |
1034 | __be32 server_id = NONE; |
1035 | int mt = 0; |
1036 | |
1037 | ext = &b->exten[4]; |
1038 | while (ext < end && *ext != 0xff) { |
1039 | u8 *opt = ext++; |
1040 | if (*opt == 0) /* Padding */ |
1041 | continue; |
1042 | ext += *ext + 1; |
1043 | if (ext >= end) |
1044 | break; |
1045 | switch (*opt) { |
1046 | case 53: /* Message type */ |
1047 | if (opt[1]) |
1048 | mt = opt[2]; |
1049 | break; |
1050 | case 54: /* Server ID (IP address) */ |
1051 | if (opt[1] >= 4) |
1052 | memcpy(&server_id, opt + 2, 4); |
1053 | break; |
1054 | } |
1055 | } |
1056 | |
1057 | #ifdef IPCONFIG_DEBUG |
1058 | printk("DHCP: Got message type %d\n", mt); |
1059 | #endif |
1060 | |
1061 | switch (mt) { |
1062 | case DHCPOFFER: |
1063 | /* While in the process of accepting one offer, |
1064 | * ignore all others. |
1065 | */ |
1066 | if (ic_myaddr != NONE) |
1067 | goto drop_unlock; |
1068 | |
1069 | /* Let's accept that offer. */ |
1070 | ic_myaddr = b->your_ip; |
1071 | ic_servaddr = server_id; |
1072 | #ifdef IPCONFIG_DEBUG |
1073 | printk("DHCP: Offered address %pI4 by server %pI4\n", |
1074 | &ic_myaddr, &b->iph.saddr); |
1075 | #endif |
1076 | /* The DHCP indicated server address takes |
1077 | * precedence over the bootp header one if |
1078 | * they are different. |
1079 | */ |
1080 | if ((server_id != NONE) && |
1081 | (b->server_ip != server_id)) |
1082 | b->server_ip = ic_servaddr; |
1083 | break; |
1084 | |
1085 | case DHCPACK: |
1086 | if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) |
1087 | goto drop_unlock; |
1088 | |
1089 | /* Yeah! */ |
1090 | break; |
1091 | |
1092 | default: |
1093 | /* Urque. Forget it*/ |
1094 | ic_myaddr = NONE; |
1095 | ic_servaddr = NONE; |
1096 | goto drop_unlock; |
1097 | } |
1098 | |
1099 | ic_dhcp_msgtype = mt; |
1100 | |
1101 | } |
1102 | #endif /* IPCONFIG_DHCP */ |
1103 | |
1104 | ext = &b->exten[4]; |
1105 | while (ext < end && *ext != 0xff) { |
1106 | u8 *opt = ext++; |
1107 | if (*opt == 0) /* Padding */ |
1108 | continue; |
1109 | ext += *ext + 1; |
1110 | if (ext < end) |
1111 | ic_do_bootp_ext(opt); |
1112 | } |
1113 | } |
1114 | |
1115 | /* We have a winner! */ |
1116 | ic_dev = dev; |
1117 | ic_myaddr = b->your_ip; |
1118 | ic_servaddr = b->server_ip; |
1119 | ic_addrservaddr = b->iph.saddr; |
1120 | if (ic_gateway == NONE && b->relay_ip) |
1121 | ic_gateway = b->relay_ip; |
1122 | if (ic_nameservers[0] == NONE) |
1123 | ic_nameservers[0] = ic_servaddr; |
1124 | ic_got_reply = IC_BOOTP; |
1125 | |
1126 | drop_unlock: |
1127 | /* Show's over. Nothing to see here. */ |
1128 | spin_unlock(&ic_recv_lock); |
1129 | |
1130 | drop: |
1131 | /* Throw the packet out. */ |
1132 | kfree_skb(skb); |
1133 | |
1134 | return 0; |
1135 | } |
1136 | |
1137 | |
1138 | #endif |
1139 | |
1140 | |
1141 | /* |
1142 | * Dynamic IP configuration -- DHCP, BOOTP, RARP. |
1143 | */ |
1144 | |
1145 | #ifdef IPCONFIG_DYNAMIC |
1146 | |
1147 | static int __init ic_dynamic(void) |
1148 | { |
1149 | int retries; |
1150 | struct ic_device *d; |
1151 | unsigned long start_jiffies, timeout, jiff; |
1152 | int do_bootp = ic_proto_have_if & IC_BOOTP; |
1153 | int do_rarp = ic_proto_have_if & IC_RARP; |
1154 | |
1155 | /* |
1156 | * If none of DHCP/BOOTP/RARP was selected, return with an error. |
1157 | * This routine gets only called when some pieces of information |
1158 | * are missing, and without DHCP/BOOTP/RARP we are unable to get it. |
1159 | */ |
1160 | if (!ic_proto_enabled) { |
1161 | pr_err("IP-Config: Incomplete network configuration information\n"); |
1162 | return -1; |
1163 | } |
1164 | |
1165 | #ifdef IPCONFIG_BOOTP |
1166 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) |
1167 | pr_err("DHCP/BOOTP: No suitable device found\n"); |
1168 | #endif |
1169 | #ifdef IPCONFIG_RARP |
1170 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) |
1171 | pr_err("RARP: No suitable device found\n"); |
1172 | #endif |
1173 | |
1174 | if (!ic_proto_have_if) |
1175 | /* Error message already printed */ |
1176 | return -1; |
1177 | |
1178 | /* |
1179 | * Setup protocols |
1180 | */ |
1181 | #ifdef IPCONFIG_BOOTP |
1182 | if (do_bootp) |
1183 | ic_bootp_init(); |
1184 | #endif |
1185 | #ifdef IPCONFIG_RARP |
1186 | if (do_rarp) |
1187 | ic_rarp_init(); |
1188 | #endif |
1189 | |
1190 | /* |
1191 | * Send requests and wait, until we get an answer. This loop |
1192 | * seems to be a terrible waste of CPU time, but actually there is |
1193 | * only one process running at all, so we don't need to use any |
1194 | * scheduler functions. |
1195 | * [Actually we could now, but the nothing else running note still |
1196 | * applies.. - AC] |
1197 | */ |
1198 | pr_notice("Sending %s%s%s requests .", |
1199 | do_bootp |
1200 | ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", |
1201 | (do_bootp && do_rarp) ? " and " : "", |
1202 | do_rarp ? "RARP" : ""); |
1203 | |
1204 | start_jiffies = jiffies; |
1205 | d = ic_first_dev; |
1206 | retries = CONF_SEND_RETRIES; |
1207 | get_random_bytes(&timeout, sizeof(timeout)); |
1208 | timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); |
1209 | for (;;) { |
1210 | /* Track the device we are configuring */ |
1211 | ic_dev_xid = d->xid; |
1212 | |
1213 | #ifdef IPCONFIG_BOOTP |
1214 | if (do_bootp && (d->able & IC_BOOTP)) |
1215 | ic_bootp_send_if(d, jiffies - start_jiffies); |
1216 | #endif |
1217 | #ifdef IPCONFIG_RARP |
1218 | if (do_rarp && (d->able & IC_RARP)) |
1219 | ic_rarp_send_if(d); |
1220 | #endif |
1221 | |
1222 | jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); |
1223 | while (time_before(jiffies, jiff) && !ic_got_reply) |
1224 | schedule_timeout_uninterruptible(1); |
1225 | #ifdef IPCONFIG_DHCP |
1226 | /* DHCP isn't done until we get a DHCPACK. */ |
1227 | if ((ic_got_reply & IC_BOOTP) && |
1228 | (ic_proto_enabled & IC_USE_DHCP) && |
1229 | ic_dhcp_msgtype != DHCPACK) { |
1230 | ic_got_reply = 0; |
1231 | pr_cont(","); |
1232 | continue; |
1233 | } |
1234 | #endif /* IPCONFIG_DHCP */ |
1235 | |
1236 | if (ic_got_reply) { |
1237 | pr_cont(" OK\n"); |
1238 | break; |
1239 | } |
1240 | |
1241 | if ((d = d->next)) |
1242 | continue; |
1243 | |
1244 | if (! --retries) { |
1245 | pr_cont(" timed out!\n"); |
1246 | break; |
1247 | } |
1248 | |
1249 | d = ic_first_dev; |
1250 | |
1251 | timeout = timeout CONF_TIMEOUT_MULT; |
1252 | if (timeout > CONF_TIMEOUT_MAX) |
1253 | timeout = CONF_TIMEOUT_MAX; |
1254 | |
1255 | pr_cont("."); |
1256 | } |
1257 | |
1258 | #ifdef IPCONFIG_BOOTP |
1259 | if (do_bootp) |
1260 | ic_bootp_cleanup(); |
1261 | #endif |
1262 | #ifdef IPCONFIG_RARP |
1263 | if (do_rarp) |
1264 | ic_rarp_cleanup(); |
1265 | #endif |
1266 | |
1267 | if (!ic_got_reply) { |
1268 | ic_myaddr = NONE; |
1269 | return -1; |
1270 | } |
1271 | |
1272 | printk("IP-Config: Got %s answer from %pI4, ", |
1273 | ((ic_got_reply & IC_RARP) ? "RARP" |
1274 | : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), |
1275 | &ic_addrservaddr); |
1276 | pr_cont("my address is %pI4\n", &ic_myaddr); |
1277 | |
1278 | return 0; |
1279 | } |
1280 | |
1281 | #endif /* IPCONFIG_DYNAMIC */ |
1282 | |
1283 | #ifdef CONFIG_PROC_FS |
1284 | |
1285 | static int pnp_seq_show(struct seq_file *seq, void *v) |
1286 | { |
1287 | int i; |
1288 | |
1289 | if (ic_proto_used & IC_PROTO) |
1290 | seq_printf(seq, "#PROTO: %s\n", |
1291 | (ic_proto_used & IC_RARP) ? "RARP" |
1292 | : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); |
1293 | else |
1294 | seq_puts(seq, "#MANUAL\n"); |
1295 | |
1296 | if (ic_domain[0]) |
1297 | seq_printf(seq, |
1298 | "domain %s\n", ic_domain); |
1299 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { |
1300 | if (ic_nameservers[i] != NONE) |
1301 | seq_printf(seq, "nameserver %pI4\n", |
1302 | &ic_nameservers[i]); |
1303 | } |
1304 | if (ic_servaddr != NONE) |
1305 | seq_printf(seq, "bootserver %pI4\n", |
1306 | &ic_servaddr); |
1307 | return 0; |
1308 | } |
1309 | |
1310 | static int pnp_seq_open(struct inode *indoe, struct file *file) |
1311 | { |
1312 | return single_open(file, pnp_seq_show, NULL); |
1313 | } |
1314 | |
1315 | static const struct file_operations pnp_seq_fops = { |
1316 | .owner = THIS_MODULE, |
1317 | .open = pnp_seq_open, |
1318 | .read = seq_read, |
1319 | .llseek = seq_lseek, |
1320 | .release = single_release, |
1321 | }; |
1322 | #endif /* CONFIG_PROC_FS */ |
1323 | |
1324 | /* |
1325 | * Extract IP address from the parameter string if needed. Note that we |
1326 | * need to have root_server_addr set _before_ IPConfig gets called as it |
1327 | * can override it. |
1328 | */ |
1329 | __be32 __init root_nfs_parse_addr(char *name) |
1330 | { |
1331 | __be32 addr; |
1332 | int octets = 0; |
1333 | char *cp, *cq; |
1334 | |
1335 | cp = cq = name; |
1336 | while (octets < 4) { |
1337 | while (*cp >= '0' && *cp <= '9') |
1338 | cp++; |
1339 | if (cp == cq || cp - cq > 3) |
1340 | break; |
1341 | if (*cp == '.' || octets == 3) |
1342 | octets++; |
1343 | if (octets < 4) |
1344 | cp++; |
1345 | cq = cp; |
1346 | } |
1347 | if (octets == 4 && (*cp == ':' || *cp == '\0')) { |
1348 | if (*cp == ':') |
1349 | *cp++ = '\0'; |
1350 | addr = in_aton(name); |
1351 | memmove(name, cp, strlen(cp) + 1); |
1352 | } else |
1353 | addr = NONE; |
1354 | |
1355 | return addr; |
1356 | } |
1357 | |
1358 | #define DEVICE_WAIT_MAX 12 /* 12 seconds */ |
1359 | |
1360 | static int __init wait_for_devices(void) |
1361 | { |
1362 | int i; |
1363 | |
1364 | for (i = 0; i < DEVICE_WAIT_MAX; i++) { |
1365 | struct net_device *dev; |
1366 | int found = 0; |
1367 | |
1368 | rtnl_lock(); |
1369 | for_each_netdev(&init_net, dev) { |
1370 | if (ic_is_init_dev(dev)) { |
1371 | found = 1; |
1372 | break; |
1373 | } |
1374 | } |
1375 | rtnl_unlock(); |
1376 | if (found) |
1377 | return 0; |
1378 | ssleep(1); |
1379 | } |
1380 | return -ENODEV; |
1381 | } |
1382 | |
1383 | /* |
1384 | * IP Autoconfig dispatcher. |
1385 | */ |
1386 | |
1387 | static int __init ip_auto_config(void) |
1388 | { |
1389 | __be32 addr; |
1390 | #ifdef IPCONFIG_DYNAMIC |
1391 | int retries = CONF_OPEN_RETRIES; |
1392 | #endif |
1393 | int err; |
1394 | unsigned int i; |
1395 | |
1396 | #ifdef CONFIG_PROC_FS |
1397 | proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops); |
1398 | #endif /* CONFIG_PROC_FS */ |
1399 | |
1400 | if (!ic_enable) |
1401 | return 0; |
1402 | |
1403 | DBG(("IP-Config: Entered.\n")); |
1404 | #ifdef IPCONFIG_DYNAMIC |
1405 | try_try_again: |
1406 | #endif |
1407 | /* Wait for devices to appear */ |
1408 | err = wait_for_devices(); |
1409 | if (err) |
1410 | return err; |
1411 | |
1412 | /* Setup all network devices */ |
1413 | err = ic_open_devs(); |
1414 | if (err) |
1415 | return err; |
1416 | |
1417 | /* Give drivers a chance to settle */ |
1418 | msleep(CONF_POST_OPEN); |
1419 | |
1420 | /* |
1421 | * If the config information is insufficient (e.g., our IP address or |
1422 | * IP address of the boot server is missing or we have multiple network |
1423 | * interfaces and no default was set), use BOOTP or RARP to get the |
1424 | * missing values. |
1425 | */ |
1426 | if (ic_myaddr == NONE || |
1427 | #ifdef CONFIG_ROOT_NFS |
1428 | (root_server_addr == NONE && |
1429 | ic_servaddr == NONE && |
1430 | ROOT_DEV == Root_NFS) || |
1431 | #endif |
1432 | ic_first_dev->next) { |
1433 | #ifdef IPCONFIG_DYNAMIC |
1434 | if (ic_dynamic() < 0) { |
1435 | ic_close_devs(); |
1436 | |
1437 | /* |
1438 | * I don't know why, but sometimes the |
1439 | * eepro100 driver (at least) gets upset and |
1440 | * doesn't work the first time it's opened. |
1441 | * But then if you close it and reopen it, it |
1442 | * works just fine. So we need to try that at |
1443 | * least once before giving up. |
1444 | * |
1445 | * Also, if the root will be NFS-mounted, we |
1446 | * have nowhere to go if DHCP fails. So we |
1447 | * just have to keep trying forever. |
1448 | * |
1449 | * -- Chip |
1450 | */ |
1451 | #ifdef CONFIG_ROOT_NFS |
1452 | if (ROOT_DEV == Root_NFS) { |
1453 | pr_err("IP-Config: Retrying forever (NFS root)...\n"); |
1454 | goto try_try_again; |
1455 | } |
1456 | #endif |
1457 | |
1458 | if (--retries) { |
1459 | pr_err("IP-Config: Reopening network devices...\n"); |
1460 | goto try_try_again; |
1461 | } |
1462 | |
1463 | /* Oh, well. At least we tried. */ |
1464 | pr_err("IP-Config: Auto-configuration of network failed\n"); |
1465 | return -1; |
1466 | } |
1467 | #else /* !DYNAMIC */ |
1468 | pr_err("IP-Config: Incomplete network configuration information\n"); |
1469 | ic_close_devs(); |
1470 | return -1; |
1471 | #endif /* IPCONFIG_DYNAMIC */ |
1472 | } else { |
1473 | /* Device selected manually or only one device -> use it */ |
1474 | ic_dev = ic_first_dev->dev; |
1475 | } |
1476 | |
1477 | addr = root_nfs_parse_addr(root_server_path); |
1478 | if (root_server_addr == NONE) |
1479 | root_server_addr = addr; |
1480 | |
1481 | /* |
1482 | * Use defaults wherever applicable. |
1483 | */ |
1484 | if (ic_defaults() < 0) |
1485 | return -1; |
1486 | |
1487 | /* |
1488 | * Close all network devices except the device we've |
1489 | * autoconfigured and set up routes. |
1490 | */ |
1491 | ic_close_devs(); |
1492 | if (ic_setup_if() < 0 || ic_setup_routes() < 0) |
1493 | return -1; |
1494 | |
1495 | /* |
1496 | * Record which protocol was actually used. |
1497 | */ |
1498 | #ifdef IPCONFIG_DYNAMIC |
1499 | ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); |
1500 | #endif |
1501 | |
1502 | #ifndef IPCONFIG_SILENT |
1503 | /* |
1504 | * Clue in the operator. |
1505 | */ |
1506 | pr_info("IP-Config: Complete:\n"); |
1507 | |
1508 | pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", |
1509 | ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr, |
1510 | &ic_myaddr, &ic_netmask, &ic_gateway); |
1511 | pr_info(" host=%s, domain=%s, nis-domain=%s\n", |
1512 | utsname()->nodename, ic_domain, utsname()->domainname); |
1513 | pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", |
1514 | &ic_servaddr, &root_server_addr, root_server_path); |
1515 | if (ic_dev_mtu) |
1516 | pr_cont(", mtu=%d", ic_dev_mtu); |
1517 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) |
1518 | if (ic_nameservers[i] != NONE) { |
1519 | pr_info(" nameserver%u=%pI4", |
1520 | i, &ic_nameservers[i]); |
1521 | break; |
1522 | } |
1523 | for (i++; i < CONF_NAMESERVERS_MAX; i++) |
1524 | if (ic_nameservers[i] != NONE) |
1525 | pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]); |
1526 | pr_cont("\n"); |
1527 | #endif /* !SILENT */ |
1528 | |
1529 | return 0; |
1530 | } |
1531 | |
1532 | late_initcall(ip_auto_config); |
1533 | |
1534 | |
1535 | /* |
1536 | * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel |
1537 | * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. |
1538 | */ |
1539 | static int __init ic_proto_name(char *name) |
1540 | { |
1541 | if (!strcmp(name, "on") || !strcmp(name, "any")) { |
1542 | return 1; |
1543 | } |
1544 | if (!strcmp(name, "off") || !strcmp(name, "none")) { |
1545 | return 0; |
1546 | } |
1547 | #ifdef CONFIG_IP_PNP_DHCP |
1548 | else if (!strcmp(name, "dhcp")) { |
1549 | ic_proto_enabled &= ~IC_RARP; |
1550 | return 1; |
1551 | } |
1552 | #endif |
1553 | #ifdef CONFIG_IP_PNP_BOOTP |
1554 | else if (!strcmp(name, "bootp")) { |
1555 | ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); |
1556 | return 1; |
1557 | } |
1558 | #endif |
1559 | #ifdef CONFIG_IP_PNP_RARP |
1560 | else if (!strcmp(name, "rarp")) { |
1561 | ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); |
1562 | return 1; |
1563 | } |
1564 | #endif |
1565 | #ifdef IPCONFIG_DYNAMIC |
1566 | else if (!strcmp(name, "both")) { |
1567 | ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ |
1568 | return 1; |
1569 | } |
1570 | #endif |
1571 | return 0; |
1572 | } |
1573 | |
1574 | static int __init ip_auto_config_setup(char *addrs) |
1575 | { |
1576 | char *cp, *ip, *dp; |
1577 | int num = 0; |
1578 | |
1579 | ic_set_manually = 1; |
1580 | ic_enable = 1; |
1581 | |
1582 | /* |
1583 | * If any dhcp, bootp etc options are set, leave autoconfig on |
1584 | * and skip the below static IP processing. |
1585 | */ |
1586 | if (ic_proto_name(addrs)) |
1587 | return 1; |
1588 | |
1589 | /* If no static IP is given, turn off autoconfig and bail. */ |
1590 | if (*addrs == 0 || |
1591 | strcmp(addrs, "off") == 0 || |
1592 | strcmp(addrs, "none") == 0) { |
1593 | ic_enable = 0; |
1594 | return 1; |
1595 | } |
1596 | |
1597 | ic_nameservers_predef(); |
1598 | |
1599 | /* Parse string for static IP assignment. */ |
1600 | ip = addrs; |
1601 | while (ip && *ip) { |
1602 | if ((cp = strchr(ip, ':'))) |
1603 | *cp++ = '\0'; |
1604 | if (strlen(ip) > 0) { |
1605 | DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); |
1606 | switch (num) { |
1607 | case 0: |
1608 | if ((ic_myaddr = in_aton(ip)) == ANY) |
1609 | ic_myaddr = NONE; |
1610 | break; |
1611 | case 1: |
1612 | if ((ic_servaddr = in_aton(ip)) == ANY) |
1613 | ic_servaddr = NONE; |
1614 | break; |
1615 | case 2: |
1616 | if ((ic_gateway = in_aton(ip)) == ANY) |
1617 | ic_gateway = NONE; |
1618 | break; |
1619 | case 3: |
1620 | if ((ic_netmask = in_aton(ip)) == ANY) |
1621 | ic_netmask = NONE; |
1622 | break; |
1623 | case 4: |
1624 | if ((dp = strchr(ip, '.'))) { |
1625 | *dp++ = '\0'; |
1626 | strlcpy(utsname()->domainname, dp, |
1627 | sizeof(utsname()->domainname)); |
1628 | } |
1629 | strlcpy(utsname()->nodename, ip, |
1630 | sizeof(utsname()->nodename)); |
1631 | ic_host_name_set = 1; |
1632 | break; |
1633 | case 5: |
1634 | strlcpy(user_dev_name, ip, sizeof(user_dev_name)); |
1635 | break; |
1636 | case 6: |
1637 | if (ic_proto_name(ip) == 0 && |
1638 | ic_myaddr == NONE) { |
1639 | ic_enable = 0; |
1640 | } |
1641 | break; |
1642 | case 7: |
1643 | if (CONF_NAMESERVERS_MAX >= 1) { |
1644 | ic_nameservers[0] = in_aton(ip); |
1645 | if (ic_nameservers[0] == ANY) |
1646 | ic_nameservers[0] = NONE; |
1647 | } |
1648 | break; |
1649 | case 8: |
1650 | if (CONF_NAMESERVERS_MAX >= 2) { |
1651 | ic_nameservers[1] = in_aton(ip); |
1652 | if (ic_nameservers[1] == ANY) |
1653 | ic_nameservers[1] = NONE; |
1654 | } |
1655 | break; |
1656 | } |
1657 | } |
1658 | ip = cp; |
1659 | num++; |
1660 | } |
1661 | |
1662 | return 1; |
1663 | } |
1664 | __setup("ip=", ip_auto_config_setup); |
1665 | |
1666 | static int __init nfsaddrs_config_setup(char *addrs) |
1667 | { |
1668 | return ip_auto_config_setup(addrs); |
1669 | } |
1670 | __setup("nfsaddrs=", nfsaddrs_config_setup); |
1671 | |
1672 | static int __init vendor_class_identifier_setup(char *addrs) |
1673 | { |
1674 | if (strlcpy(vendor_class_identifier, addrs, |
1675 | sizeof(vendor_class_identifier)) |
1676 | >= sizeof(vendor_class_identifier)) |
1677 | pr_warn("DHCP: vendorclass too long, truncated to \"%s\"", |
1678 | vendor_class_identifier); |
1679 | return 1; |
1680 | } |
1681 | __setup("dhcpclass=", vendor_class_identifier_setup); |
1682 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9