1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or |
4 | * user-supplied information to configure own IP address and routes. |
5 | * |
6 | * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> |
7 | * |
8 | * Derived from network configuration code in fs/nfs/nfsroot.c, |
9 | * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. |
10 | * |
11 | * BOOTP rewritten to construct and analyse packets itself instead |
12 | * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; |
13 | * -- MJ, December 1998 |
14 | * |
15 | * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" |
16 | * initialization scheme. |
17 | * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 |
18 | * |
19 | * DHCP support added. To users this looks like a whole separate |
20 | * protocol, but we know it's just a bag on the side of BOOTP. |
21 | * -- Chip Salzenberg <chip@valinux.com>, May 2000 |
22 | * |
23 | * Ported DHCP support from 2.2.16 to 2.4.0-test4 |
24 | * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 |
25 | * |
26 | * Merged changes from 2.2.19 into 2.4.3 |
27 | * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 |
28 | * |
29 | * Multiple Nameservers in /proc/net/pnp |
30 | * -- Josef Siemes <jsiemes@web.de>, Aug 2002 |
31 | * |
32 | * NTP servers in /proc/net/ipconfig/ntp_servers |
33 | * -- Chris Novakovic <chris@chrisn.me.uk>, April 2018 |
34 | */ |
35 | |
36 | #include <linux/types.h> |
37 | #include <linux/string.h> |
38 | #include <linux/kernel.h> |
39 | #include <linux/jiffies.h> |
40 | #include <linux/random.h> |
41 | #include <linux/init.h> |
42 | #include <linux/utsname.h> |
43 | #include <linux/in.h> |
44 | #include <linux/if.h> |
45 | #include <linux/inet.h> |
46 | #include <linux/inetdevice.h> |
47 | #include <linux/netdevice.h> |
48 | #include <linux/if_arp.h> |
49 | #include <linux/skbuff.h> |
50 | #include <linux/ip.h> |
51 | #include <linux/socket.h> |
52 | #include <linux/route.h> |
53 | #include <linux/udp.h> |
54 | #include <linux/proc_fs.h> |
55 | #include <linux/seq_file.h> |
56 | #include <linux/major.h> |
57 | #include <linux/root_dev.h> |
58 | #include <linux/delay.h> |
59 | #include <linux/nfs_fs.h> |
60 | #include <linux/slab.h> |
61 | #include <linux/export.h> |
62 | #include <net/net_namespace.h> |
63 | #include <net/arp.h> |
64 | #include <net/dsa.h> |
65 | #include <net/ip.h> |
66 | #include <net/ipconfig.h> |
67 | #include <net/route.h> |
68 | |
69 | #include <linux/uaccess.h> |
70 | #include <net/checksum.h> |
71 | #include <asm/processor.h> |
72 | |
73 | #if defined(CONFIG_IP_PNP_DHCP) |
74 | #define IPCONFIG_DHCP |
75 | #endif |
76 | #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) |
77 | #define IPCONFIG_BOOTP |
78 | #endif |
79 | #if defined(CONFIG_IP_PNP_RARP) |
80 | #define IPCONFIG_RARP |
81 | #endif |
82 | #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) |
83 | #define IPCONFIG_DYNAMIC |
84 | #endif |
85 | |
86 | /* Define the friendly delay before and after opening net devices */ |
87 | #define CONF_POST_OPEN 10 /* After opening: 10 msecs */ |
88 | |
89 | /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ |
90 | #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ |
91 | #define CONF_SEND_RETRIES 6 /* Send six requests per open */ |
92 | #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ |
93 | #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ |
94 | #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ |
95 | #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ |
96 | #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers |
97 | - '3' from resolv.h */ |
98 | #define CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */ |
99 | |
100 | #define NONE cpu_to_be32(INADDR_NONE) |
101 | #define ANY cpu_to_be32(INADDR_ANY) |
102 | |
103 | /* Wait for carrier timeout default in seconds */ |
104 | static unsigned int carrier_timeout = 120; |
105 | |
106 | /* |
107 | * Public IP configuration |
108 | */ |
109 | |
110 | /* This is used by platforms which might be able to set the ipconfig |
111 | * variables using firmware environment vars. If this is set, it will |
112 | * ignore such firmware variables. |
113 | */ |
114 | int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ |
115 | |
116 | static int ic_enable __initdata; /* IP config enabled? */ |
117 | |
118 | /* Protocol choice */ |
119 | int ic_proto_enabled __initdata = 0 |
120 | #ifdef IPCONFIG_BOOTP |
121 | | IC_BOOTP |
122 | #endif |
123 | #ifdef CONFIG_IP_PNP_DHCP |
124 | | IC_USE_DHCP |
125 | #endif |
126 | #ifdef IPCONFIG_RARP |
127 | | IC_RARP |
128 | #endif |
129 | ; |
130 | |
131 | static int ic_host_name_set __initdata; /* Host name set by us? */ |
132 | |
133 | __be32 ic_myaddr = NONE; /* My IP address */ |
134 | static __be32 ic_netmask = NONE; /* Netmask for local subnet */ |
135 | __be32 ic_gateway = NONE; /* Gateway IP address */ |
136 | |
137 | #ifdef IPCONFIG_DYNAMIC |
138 | static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ |
139 | #endif |
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 | /* vendor class identifier */ |
147 | static char vendor_class_identifier[253] __initdata; |
148 | |
149 | #if defined(CONFIG_IP_PNP_DHCP) |
150 | static char dhcp_client_identifier[253] __initdata; |
151 | #endif |
152 | |
153 | /* Persistent data: */ |
154 | |
155 | #ifdef IPCONFIG_DYNAMIC |
156 | static int ic_proto_used; /* Protocol used, if any */ |
157 | #else |
158 | #define ic_proto_used 0 |
159 | #endif |
160 | static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ |
161 | static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */ |
162 | static u8 ic_domain[64]; /* DNS (not NIS) domain name */ |
163 | |
164 | /* |
165 | * Private state. |
166 | */ |
167 | |
168 | /* Name of user-selected boot device */ |
169 | static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; |
170 | |
171 | /* Protocols supported by available interfaces */ |
172 | static int ic_proto_have_if __initdata; |
173 | |
174 | /* MTU for boot device */ |
175 | static int ic_dev_mtu __initdata; |
176 | |
177 | #ifdef IPCONFIG_DYNAMIC |
178 | static DEFINE_SPINLOCK(ic_recv_lock); |
179 | static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ |
180 | #endif |
181 | #ifdef IPCONFIG_DHCP |
182 | static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ |
183 | #endif |
184 | |
185 | |
186 | /* |
187 | * Network devices |
188 | */ |
189 | |
190 | struct ic_device { |
191 | struct ic_device *next; |
192 | struct net_device *dev; |
193 | unsigned short flags; |
194 | short able; |
195 | __be32 xid; |
196 | }; |
197 | |
198 | static struct ic_device *ic_first_dev __initdata; /* List of open device */ |
199 | static struct ic_device *ic_dev __initdata; /* Selected device */ |
200 | |
201 | static bool __init ic_is_init_dev(struct net_device *dev) |
202 | { |
203 | if (dev->flags & IFF_LOOPBACK) |
204 | return false; |
205 | return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : |
206 | (!(dev->flags & IFF_LOOPBACK) && |
207 | (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && |
208 | strncmp(dev->name, "dummy" , 5)); |
209 | } |
210 | |
211 | static int __init ic_open_devs(void) |
212 | { |
213 | struct ic_device *d, **last; |
214 | struct net_device *dev; |
215 | unsigned short oflags; |
216 | unsigned long start, next_msg; |
217 | |
218 | last = &ic_first_dev; |
219 | rtnl_lock(); |
220 | |
221 | /* bring loopback and DSA master network devices up first */ |
222 | for_each_netdev(&init_net, dev) { |
223 | if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev)) |
224 | continue; |
225 | if (dev_change_flags(dev, dev->flags | IFF_UP, NULL) < 0) |
226 | pr_err("IP-Config: Failed to open %s\n" , dev->name); |
227 | } |
228 | |
229 | for_each_netdev(&init_net, dev) { |
230 | if (ic_is_init_dev(dev)) { |
231 | int able = 0; |
232 | if (dev->mtu >= 364) |
233 | able |= IC_BOOTP; |
234 | else |
235 | pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n" , |
236 | dev->name, dev->mtu); |
237 | if (!(dev->flags & IFF_NOARP)) |
238 | able |= IC_RARP; |
239 | able &= ic_proto_enabled; |
240 | if (ic_proto_enabled && !able) |
241 | continue; |
242 | oflags = dev->flags; |
243 | if (dev_change_flags(dev, oflags | IFF_UP, NULL) < 0) { |
244 | pr_err("IP-Config: Failed to open %s\n" , |
245 | dev->name); |
246 | continue; |
247 | } |
248 | if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { |
249 | rtnl_unlock(); |
250 | return -ENOMEM; |
251 | } |
252 | d->dev = dev; |
253 | *last = d; |
254 | last = &d->next; |
255 | d->flags = oflags; |
256 | d->able = able; |
257 | if (able & IC_BOOTP) |
258 | get_random_bytes(&d->xid, sizeof(__be32)); |
259 | else |
260 | d->xid = 0; |
261 | ic_proto_have_if |= able; |
262 | pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n" , |
263 | dev->name, able, d->xid); |
264 | } |
265 | } |
266 | |
267 | /* no point in waiting if we could not bring up at least one device */ |
268 | if (!ic_first_dev) |
269 | goto have_carrier; |
270 | |
271 | /* wait for a carrier on at least one device */ |
272 | start = jiffies; |
273 | next_msg = start + msecs_to_jiffies(20000); |
274 | while (time_before(jiffies, start + |
275 | msecs_to_jiffies(carrier_timeout * 1000))) { |
276 | int wait, elapsed; |
277 | |
278 | for_each_netdev(&init_net, dev) |
279 | if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) |
280 | goto have_carrier; |
281 | |
282 | msleep(1); |
283 | |
284 | if (time_before(jiffies, next_msg)) |
285 | continue; |
286 | |
287 | elapsed = jiffies_to_msecs(jiffies - start); |
288 | wait = (carrier_timeout * 1000 - elapsed + 500) / 1000; |
289 | pr_info("Waiting up to %d more seconds for network.\n" , wait); |
290 | next_msg = jiffies + msecs_to_jiffies(20000); |
291 | } |
292 | have_carrier: |
293 | rtnl_unlock(); |
294 | |
295 | *last = NULL; |
296 | |
297 | if (!ic_first_dev) { |
298 | if (user_dev_name[0]) |
299 | pr_err("IP-Config: Device `%s' not found\n" , |
300 | user_dev_name); |
301 | else |
302 | pr_err("IP-Config: No network devices available\n" ); |
303 | return -ENODEV; |
304 | } |
305 | return 0; |
306 | } |
307 | |
308 | static void __init ic_close_devs(void) |
309 | { |
310 | struct ic_device *d, *next; |
311 | struct net_device *dev; |
312 | |
313 | rtnl_lock(); |
314 | next = ic_first_dev; |
315 | while ((d = next)) { |
316 | next = d->next; |
317 | dev = d->dev; |
318 | if (d != ic_dev && !netdev_uses_dsa(dev)) { |
319 | pr_debug("IP-Config: Downing %s\n" , dev->name); |
320 | dev_change_flags(dev, d->flags, NULL); |
321 | } |
322 | kfree(d); |
323 | } |
324 | rtnl_unlock(); |
325 | } |
326 | |
327 | /* |
328 | * Interface to various network functions. |
329 | */ |
330 | |
331 | static inline void |
332 | set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) |
333 | { |
334 | sin->sin_family = AF_INET; |
335 | sin->sin_addr.s_addr = addr; |
336 | sin->sin_port = port; |
337 | } |
338 | |
339 | /* |
340 | * Set up interface addresses and routes. |
341 | */ |
342 | |
343 | static int __init ic_setup_if(void) |
344 | { |
345 | struct ifreq ir; |
346 | struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; |
347 | int err; |
348 | |
349 | memset(&ir, 0, sizeof(ir)); |
350 | strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); |
351 | set_sockaddr(sin, ic_myaddr, 0); |
352 | if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) { |
353 | pr_err("IP-Config: Unable to set interface address (%d)\n" , |
354 | err); |
355 | return -1; |
356 | } |
357 | set_sockaddr(sin, ic_netmask, 0); |
358 | if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) { |
359 | pr_err("IP-Config: Unable to set interface netmask (%d)\n" , |
360 | err); |
361 | return -1; |
362 | } |
363 | set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); |
364 | if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) { |
365 | pr_err("IP-Config: Unable to set interface broadcast address (%d)\n" , |
366 | err); |
367 | return -1; |
368 | } |
369 | /* Handle the case where we need non-standard MTU on the boot link (a network |
370 | * using jumbo frames, for instance). If we can't set the mtu, don't error |
371 | * out, we'll try to muddle along. |
372 | */ |
373 | if (ic_dev_mtu != 0) { |
374 | rtnl_lock(); |
375 | if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) |
376 | pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n" , |
377 | ic_dev_mtu, err); |
378 | rtnl_unlock(); |
379 | } |
380 | return 0; |
381 | } |
382 | |
383 | static int __init ic_setup_routes(void) |
384 | { |
385 | /* No need to setup device routes, only the default route... */ |
386 | |
387 | if (ic_gateway != NONE) { |
388 | struct rtentry rm; |
389 | int err; |
390 | |
391 | memset(&rm, 0, sizeof(rm)); |
392 | if ((ic_gateway ^ ic_myaddr) & ic_netmask) { |
393 | pr_err("IP-Config: Gateway not on directly connected network\n" ); |
394 | return -1; |
395 | } |
396 | set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); |
397 | set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); |
398 | set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); |
399 | rm.rt_flags = RTF_UP | RTF_GATEWAY; |
400 | if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { |
401 | pr_err("IP-Config: Cannot add default route (%d)\n" , |
402 | err); |
403 | return -1; |
404 | } |
405 | } |
406 | |
407 | return 0; |
408 | } |
409 | |
410 | /* |
411 | * Fill in default values for all missing parameters. |
412 | */ |
413 | |
414 | static int __init ic_defaults(void) |
415 | { |
416 | /* |
417 | * At this point we have no userspace running so need not |
418 | * claim locks on system_utsname |
419 | */ |
420 | |
421 | if (!ic_host_name_set) |
422 | sprintf(init_utsname()->nodename, "%pI4" , &ic_myaddr); |
423 | |
424 | if (root_server_addr == NONE) |
425 | root_server_addr = ic_servaddr; |
426 | |
427 | if (ic_netmask == NONE) { |
428 | if (IN_CLASSA(ntohl(ic_myaddr))) |
429 | ic_netmask = htonl(IN_CLASSA_NET); |
430 | else if (IN_CLASSB(ntohl(ic_myaddr))) |
431 | ic_netmask = htonl(IN_CLASSB_NET); |
432 | else if (IN_CLASSC(ntohl(ic_myaddr))) |
433 | ic_netmask = htonl(IN_CLASSC_NET); |
434 | else if (IN_CLASSE(ntohl(ic_myaddr))) |
435 | ic_netmask = htonl(IN_CLASSE_NET); |
436 | else { |
437 | pr_err("IP-Config: Unable to guess netmask for address %pI4\n" , |
438 | &ic_myaddr); |
439 | return -1; |
440 | } |
441 | pr_notice("IP-Config: Guessing netmask %pI4\n" , |
442 | &ic_netmask); |
443 | } |
444 | |
445 | return 0; |
446 | } |
447 | |
448 | /* |
449 | * RARP support. |
450 | */ |
451 | |
452 | #ifdef IPCONFIG_RARP |
453 | |
454 | static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
455 | |
456 | static struct packet_type rarp_packet_type __initdata = { |
457 | .type = cpu_to_be16(ETH_P_RARP), |
458 | .func = ic_rarp_recv, |
459 | }; |
460 | |
461 | static inline void __init ic_rarp_init(void) |
462 | { |
463 | dev_add_pack(&rarp_packet_type); |
464 | } |
465 | |
466 | static inline void __init ic_rarp_cleanup(void) |
467 | { |
468 | dev_remove_pack(&rarp_packet_type); |
469 | } |
470 | |
471 | /* |
472 | * Process received RARP packet. |
473 | */ |
474 | static int __init |
475 | ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
476 | { |
477 | struct arphdr *rarp; |
478 | unsigned char *rarp_ptr; |
479 | __be32 sip, tip; |
480 | unsigned char *tha; /* t for "target" */ |
481 | struct ic_device *d; |
482 | |
483 | if (!net_eq(dev_net(dev), &init_net)) |
484 | goto drop; |
485 | |
486 | skb = skb_share_check(skb, GFP_ATOMIC); |
487 | if (!skb) |
488 | return NET_RX_DROP; |
489 | |
490 | if (!pskb_may_pull(skb, sizeof(struct arphdr))) |
491 | goto drop; |
492 | |
493 | /* Basic sanity checks can be done without the lock. */ |
494 | rarp = (struct arphdr *)skb_transport_header(skb); |
495 | |
496 | /* If this test doesn't pass, it's not IP, or we should |
497 | * ignore it anyway. |
498 | */ |
499 | if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) |
500 | goto drop; |
501 | |
502 | /* If it's not a RARP reply, delete it. */ |
503 | if (rarp->ar_op != htons(ARPOP_RREPLY)) |
504 | goto drop; |
505 | |
506 | /* If it's not Ethernet, delete it. */ |
507 | if (rarp->ar_pro != htons(ETH_P_IP)) |
508 | goto drop; |
509 | |
510 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) |
511 | goto drop; |
512 | |
513 | /* OK, it is all there and looks valid, process... */ |
514 | rarp = (struct arphdr *)skb_transport_header(skb); |
515 | rarp_ptr = (unsigned char *) (rarp + 1); |
516 | |
517 | /* One reply at a time, please. */ |
518 | spin_lock(&ic_recv_lock); |
519 | |
520 | /* If we already have a reply, just drop the packet */ |
521 | if (ic_got_reply) |
522 | goto drop_unlock; |
523 | |
524 | /* Find the ic_device that the packet arrived on */ |
525 | d = ic_first_dev; |
526 | while (d && d->dev != dev) |
527 | d = d->next; |
528 | if (!d) |
529 | goto drop_unlock; /* should never happen */ |
530 | |
531 | /* Extract variable-width fields */ |
532 | rarp_ptr += dev->addr_len; |
533 | memcpy(&sip, rarp_ptr, 4); |
534 | rarp_ptr += 4; |
535 | tha = rarp_ptr; |
536 | rarp_ptr += dev->addr_len; |
537 | memcpy(&tip, rarp_ptr, 4); |
538 | |
539 | /* Discard packets which are not meant for us. */ |
540 | if (memcmp(tha, dev->dev_addr, dev->addr_len)) |
541 | goto drop_unlock; |
542 | |
543 | /* Discard packets which are not from specified server. */ |
544 | if (ic_servaddr != NONE && ic_servaddr != sip) |
545 | goto drop_unlock; |
546 | |
547 | /* We have a winner! */ |
548 | ic_dev = d; |
549 | if (ic_myaddr == NONE) |
550 | ic_myaddr = tip; |
551 | ic_servaddr = sip; |
552 | ic_addrservaddr = sip; |
553 | ic_got_reply = IC_RARP; |
554 | |
555 | drop_unlock: |
556 | /* Show's over. Nothing to see here. */ |
557 | spin_unlock(&ic_recv_lock); |
558 | |
559 | drop: |
560 | /* Throw the packet out. */ |
561 | kfree_skb(skb); |
562 | return 0; |
563 | } |
564 | |
565 | |
566 | /* |
567 | * Send RARP request packet over a single interface. |
568 | */ |
569 | static void __init ic_rarp_send_if(struct ic_device *d) |
570 | { |
571 | struct net_device *dev = d->dev; |
572 | arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, |
573 | dev->dev_addr, dev->dev_addr); |
574 | } |
575 | #endif |
576 | |
577 | /* |
578 | * Predefine Nameservers |
579 | */ |
580 | static inline void __init ic_nameservers_predef(void) |
581 | { |
582 | int i; |
583 | |
584 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) |
585 | ic_nameservers[i] = NONE; |
586 | } |
587 | |
588 | /* Predefine NTP servers */ |
589 | static inline void __init ic_ntp_servers_predef(void) |
590 | { |
591 | int i; |
592 | |
593 | for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) |
594 | ic_ntp_servers[i] = NONE; |
595 | } |
596 | |
597 | /* |
598 | * DHCP/BOOTP support. |
599 | */ |
600 | |
601 | #ifdef IPCONFIG_BOOTP |
602 | |
603 | struct bootp_pkt { /* BOOTP packet format */ |
604 | struct iphdr iph; /* IP header */ |
605 | struct udphdr udph; /* UDP header */ |
606 | u8 op; /* 1=request, 2=reply */ |
607 | u8 htype; /* HW address type */ |
608 | u8 hlen; /* HW address length */ |
609 | u8 hops; /* Used only by gateways */ |
610 | __be32 xid; /* Transaction ID */ |
611 | __be16 secs; /* Seconds since we started */ |
612 | __be16 flags; /* Just what it says */ |
613 | __be32 client_ip; /* Client's IP address if known */ |
614 | __be32 your_ip; /* Assigned IP address */ |
615 | __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ |
616 | __be32 relay_ip; /* IP address of BOOTP relay */ |
617 | u8 hw_addr[16]; /* Client's HW address */ |
618 | u8 serv_name[64]; /* Server host name */ |
619 | u8 boot_file[128]; /* Name of boot file */ |
620 | u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ |
621 | }; |
622 | |
623 | /* packet ops */ |
624 | #define BOOTP_REQUEST 1 |
625 | #define BOOTP_REPLY 2 |
626 | |
627 | /* DHCP message types */ |
628 | #define DHCPDISCOVER 1 |
629 | #define DHCPOFFER 2 |
630 | #define DHCPREQUEST 3 |
631 | #define DHCPDECLINE 4 |
632 | #define DHCPACK 5 |
633 | #define DHCPNAK 6 |
634 | #define DHCPRELEASE 7 |
635 | #define DHCPINFORM 8 |
636 | |
637 | static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
638 | |
639 | static struct packet_type bootp_packet_type __initdata = { |
640 | .type = cpu_to_be16(ETH_P_IP), |
641 | .func = ic_bootp_recv, |
642 | }; |
643 | |
644 | /* |
645 | * Initialize DHCP/BOOTP extension fields in the request. |
646 | */ |
647 | |
648 | static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; |
649 | |
650 | #ifdef IPCONFIG_DHCP |
651 | |
652 | static void __init |
653 | ic_dhcp_init_options(u8 *options, struct ic_device *d) |
654 | { |
655 | u8 mt = ((ic_servaddr == NONE) |
656 | ? DHCPDISCOVER : DHCPREQUEST); |
657 | u8 *e = options; |
658 | int len; |
659 | |
660 | pr_debug("DHCP: Sending message type %d (%s)\n" , mt, d->dev->name); |
661 | |
662 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ |
663 | e += 4; |
664 | |
665 | *e++ = 53; /* DHCP message type */ |
666 | *e++ = 1; |
667 | *e++ = mt; |
668 | |
669 | if (mt == DHCPREQUEST) { |
670 | *e++ = 54; /* Server ID (IP address) */ |
671 | *e++ = 4; |
672 | memcpy(e, &ic_servaddr, 4); |
673 | e += 4; |
674 | |
675 | *e++ = 50; /* Requested IP address */ |
676 | *e++ = 4; |
677 | memcpy(e, &ic_myaddr, 4); |
678 | e += 4; |
679 | } |
680 | |
681 | /* always? */ |
682 | { |
683 | static const u8 ic_req_params[] = { |
684 | 1, /* Subnet mask */ |
685 | 3, /* Default gateway */ |
686 | 6, /* DNS server */ |
687 | 12, /* Host name */ |
688 | 15, /* Domain name */ |
689 | 17, /* Boot path */ |
690 | 26, /* MTU */ |
691 | 40, /* NIS domain name */ |
692 | 42, /* NTP servers */ |
693 | }; |
694 | |
695 | *e++ = 55; /* Parameter request list */ |
696 | *e++ = sizeof(ic_req_params); |
697 | memcpy(e, ic_req_params, sizeof(ic_req_params)); |
698 | e += sizeof(ic_req_params); |
699 | |
700 | if (ic_host_name_set) { |
701 | *e++ = 12; /* host-name */ |
702 | len = strlen(utsname()->nodename); |
703 | *e++ = len; |
704 | memcpy(e, utsname()->nodename, len); |
705 | e += len; |
706 | } |
707 | if (*vendor_class_identifier) { |
708 | pr_info("DHCP: sending class identifier \"%s\"\n" , |
709 | vendor_class_identifier); |
710 | *e++ = 60; /* Class-identifier */ |
711 | len = strlen(vendor_class_identifier); |
712 | *e++ = len; |
713 | memcpy(e, vendor_class_identifier, len); |
714 | e += len; |
715 | } |
716 | len = strlen(dhcp_client_identifier + 1); |
717 | /* the minimum length of identifier is 2, include 1 byte type, |
718 | * and can not be larger than the length of options |
719 | */ |
720 | if (len >= 1 && len < 312 - (e - options) - 1) { |
721 | *e++ = 61; |
722 | *e++ = len + 1; |
723 | memcpy(e, dhcp_client_identifier, len + 1); |
724 | e += len + 1; |
725 | } |
726 | } |
727 | |
728 | *e++ = 255; /* End of the list */ |
729 | } |
730 | |
731 | #endif /* IPCONFIG_DHCP */ |
732 | |
733 | static void __init ic_bootp_init_ext(u8 *e) |
734 | { |
735 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ |
736 | e += 4; |
737 | *e++ = 1; /* Subnet mask request */ |
738 | *e++ = 4; |
739 | e += 4; |
740 | *e++ = 3; /* Default gateway request */ |
741 | *e++ = 4; |
742 | e += 4; |
743 | #if CONF_NAMESERVERS_MAX > 0 |
744 | *e++ = 6; /* (DNS) name server request */ |
745 | *e++ = 4 * CONF_NAMESERVERS_MAX; |
746 | e += 4 * CONF_NAMESERVERS_MAX; |
747 | #endif |
748 | *e++ = 12; /* Host name request */ |
749 | *e++ = 32; |
750 | e += 32; |
751 | *e++ = 40; /* NIS Domain name request */ |
752 | *e++ = 32; |
753 | e += 32; |
754 | *e++ = 17; /* Boot path */ |
755 | *e++ = 40; |
756 | e += 40; |
757 | |
758 | *e++ = 57; /* set extension buffer size for reply */ |
759 | *e++ = 2; |
760 | *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ |
761 | *e++ = 150; |
762 | |
763 | *e++ = 255; /* End of the list */ |
764 | } |
765 | |
766 | |
767 | /* |
768 | * Initialize the DHCP/BOOTP mechanism. |
769 | */ |
770 | static inline void __init ic_bootp_init(void) |
771 | { |
772 | /* Re-initialise all name servers and NTP servers to NONE, in case any |
773 | * were set via the "ip=" or "nfsaddrs=" kernel command line parameters: |
774 | * any IP addresses specified there will already have been decoded but |
775 | * are no longer needed |
776 | */ |
777 | ic_nameservers_predef(); |
778 | ic_ntp_servers_predef(); |
779 | |
780 | dev_add_pack(&bootp_packet_type); |
781 | } |
782 | |
783 | |
784 | /* |
785 | * DHCP/BOOTP cleanup. |
786 | */ |
787 | static inline void __init ic_bootp_cleanup(void) |
788 | { |
789 | dev_remove_pack(&bootp_packet_type); |
790 | } |
791 | |
792 | |
793 | /* |
794 | * Send DHCP/BOOTP request to single interface. |
795 | */ |
796 | static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) |
797 | { |
798 | struct net_device *dev = d->dev; |
799 | struct sk_buff *skb; |
800 | struct bootp_pkt *b; |
801 | struct iphdr *h; |
802 | int hlen = LL_RESERVED_SPACE(dev); |
803 | int tlen = dev->needed_tailroom; |
804 | |
805 | /* Allocate packet */ |
806 | skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, |
807 | GFP_KERNEL); |
808 | if (!skb) |
809 | return; |
810 | skb_reserve(skb, hlen); |
811 | b = skb_put_zero(skb, sizeof(struct bootp_pkt)); |
812 | |
813 | /* Construct IP header */ |
814 | skb_reset_network_header(skb); |
815 | h = ip_hdr(skb); |
816 | h->version = 4; |
817 | h->ihl = 5; |
818 | h->tot_len = htons(sizeof(struct bootp_pkt)); |
819 | h->frag_off = htons(IP_DF); |
820 | h->ttl = 64; |
821 | h->protocol = IPPROTO_UDP; |
822 | h->daddr = htonl(INADDR_BROADCAST); |
823 | h->check = ip_fast_csum((unsigned char *) h, h->ihl); |
824 | |
825 | /* Construct UDP header */ |
826 | b->udph.source = htons(68); |
827 | b->udph.dest = htons(67); |
828 | b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); |
829 | /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ |
830 | |
831 | /* Construct DHCP/BOOTP header */ |
832 | b->op = BOOTP_REQUEST; |
833 | if (dev->type < 256) /* check for false types */ |
834 | b->htype = dev->type; |
835 | else if (dev->type == ARPHRD_FDDI) |
836 | b->htype = ARPHRD_ETHER; |
837 | else { |
838 | pr_warn("Unknown ARP type 0x%04x for device %s\n" , dev->type, |
839 | dev->name); |
840 | b->htype = dev->type; /* can cause undefined behavior */ |
841 | } |
842 | |
843 | /* server_ip and your_ip address are both already zero per RFC2131 */ |
844 | b->hlen = dev->addr_len; |
845 | memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); |
846 | b->secs = htons(jiffies_diff / HZ); |
847 | b->xid = d->xid; |
848 | |
849 | /* add DHCP options or BOOTP extensions */ |
850 | #ifdef IPCONFIG_DHCP |
851 | if (ic_proto_enabled & IC_USE_DHCP) |
852 | ic_dhcp_init_options(b->exten, d); |
853 | else |
854 | #endif |
855 | ic_bootp_init_ext(b->exten); |
856 | |
857 | /* Chain packet down the line... */ |
858 | skb->dev = dev; |
859 | skb->protocol = htons(ETH_P_IP); |
860 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), |
861 | dev->broadcast, dev->dev_addr, skb->len) < 0) { |
862 | kfree_skb(skb); |
863 | printk("E" ); |
864 | return; |
865 | } |
866 | |
867 | if (dev_queue_xmit(skb) < 0) |
868 | printk("E" ); |
869 | } |
870 | |
871 | |
872 | /* |
873 | * Copy BOOTP-supplied string if not already set. |
874 | */ |
875 | static int __init ic_bootp_string(char *dest, char *src, int len, int max) |
876 | { |
877 | if (!len) |
878 | return 0; |
879 | if (len > max-1) |
880 | len = max-1; |
881 | memcpy(dest, src, len); |
882 | dest[len] = '\0'; |
883 | return 1; |
884 | } |
885 | |
886 | |
887 | /* |
888 | * Process BOOTP extensions. |
889 | */ |
890 | static void __init ic_do_bootp_ext(u8 *ext) |
891 | { |
892 | u8 servers; |
893 | int i; |
894 | __be16 mtu; |
895 | |
896 | u8 *c; |
897 | |
898 | pr_debug("DHCP/BOOTP: Got extension %d:" , *ext); |
899 | for (c=ext+2; c<ext+2+ext[1]; c++) |
900 | pr_debug(" %02x" , *c); |
901 | pr_debug("\n" ); |
902 | |
903 | switch (*ext++) { |
904 | case 1: /* Subnet mask */ |
905 | if (ic_netmask == NONE) |
906 | memcpy(&ic_netmask, ext+1, 4); |
907 | break; |
908 | case 3: /* Default gateway */ |
909 | if (ic_gateway == NONE) |
910 | memcpy(&ic_gateway, ext+1, 4); |
911 | break; |
912 | case 6: /* DNS server */ |
913 | servers= *ext/4; |
914 | if (servers > CONF_NAMESERVERS_MAX) |
915 | servers = CONF_NAMESERVERS_MAX; |
916 | for (i = 0; i < servers; i++) { |
917 | if (ic_nameservers[i] == NONE) |
918 | memcpy(&ic_nameservers[i], ext+1+4*i, 4); |
919 | } |
920 | break; |
921 | case 12: /* Host name */ |
922 | ic_bootp_string(utsname()->nodename, ext+1, *ext, |
923 | __NEW_UTS_LEN); |
924 | ic_host_name_set = 1; |
925 | break; |
926 | case 15: /* Domain name (DNS) */ |
927 | ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); |
928 | break; |
929 | case 17: /* Root path */ |
930 | if (!root_server_path[0]) |
931 | ic_bootp_string(root_server_path, ext+1, *ext, |
932 | sizeof(root_server_path)); |
933 | break; |
934 | case 26: /* Interface MTU */ |
935 | memcpy(&mtu, ext+1, sizeof(mtu)); |
936 | ic_dev_mtu = ntohs(mtu); |
937 | break; |
938 | case 40: /* NIS Domain name (_not_ DNS) */ |
939 | ic_bootp_string(utsname()->domainname, ext+1, *ext, |
940 | __NEW_UTS_LEN); |
941 | break; |
942 | case 42: /* NTP servers */ |
943 | servers = *ext / 4; |
944 | if (servers > CONF_NTP_SERVERS_MAX) |
945 | servers = CONF_NTP_SERVERS_MAX; |
946 | for (i = 0; i < servers; i++) { |
947 | if (ic_ntp_servers[i] == NONE) |
948 | memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); |
949 | } |
950 | break; |
951 | } |
952 | } |
953 | |
954 | |
955 | /* |
956 | * Receive BOOTP reply. |
957 | */ |
958 | static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
959 | { |
960 | struct bootp_pkt *b; |
961 | struct iphdr *h; |
962 | struct ic_device *d; |
963 | int len, ext_len; |
964 | |
965 | if (!net_eq(dev_net(dev), &init_net)) |
966 | goto drop; |
967 | |
968 | /* Perform verifications before taking the lock. */ |
969 | if (skb->pkt_type == PACKET_OTHERHOST) |
970 | goto drop; |
971 | |
972 | skb = skb_share_check(skb, GFP_ATOMIC); |
973 | if (!skb) |
974 | return NET_RX_DROP; |
975 | |
976 | if (!pskb_may_pull(skb, |
977 | sizeof(struct iphdr) + |
978 | sizeof(struct udphdr))) |
979 | goto drop; |
980 | |
981 | b = (struct bootp_pkt *)skb_network_header(skb); |
982 | h = &b->iph; |
983 | |
984 | if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) |
985 | goto drop; |
986 | |
987 | /* Fragments are not supported */ |
988 | if (ip_is_fragment(h)) { |
989 | net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n" ); |
990 | goto drop; |
991 | } |
992 | |
993 | if (skb->len < ntohs(h->tot_len)) |
994 | goto drop; |
995 | |
996 | if (ip_fast_csum((char *) h, h->ihl)) |
997 | goto drop; |
998 | |
999 | if (b->udph.source != htons(67) || b->udph.dest != htons(68)) |
1000 | goto drop; |
1001 | |
1002 | if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) |
1003 | goto drop; |
1004 | |
1005 | len = ntohs(b->udph.len) - sizeof(struct udphdr); |
1006 | ext_len = len - (sizeof(*b) - |
1007 | sizeof(struct iphdr) - |
1008 | sizeof(struct udphdr) - |
1009 | sizeof(b->exten)); |
1010 | if (ext_len < 0) |
1011 | goto drop; |
1012 | |
1013 | /* Ok the front looks good, make sure we can get at the rest. */ |
1014 | if (!pskb_may_pull(skb, skb->len)) |
1015 | goto drop; |
1016 | |
1017 | b = (struct bootp_pkt *)skb_network_header(skb); |
1018 | h = &b->iph; |
1019 | |
1020 | /* One reply at a time, please. */ |
1021 | spin_lock(&ic_recv_lock); |
1022 | |
1023 | /* If we already have a reply, just drop the packet */ |
1024 | if (ic_got_reply) |
1025 | goto drop_unlock; |
1026 | |
1027 | /* Find the ic_device that the packet arrived on */ |
1028 | d = ic_first_dev; |
1029 | while (d && d->dev != dev) |
1030 | d = d->next; |
1031 | if (!d) |
1032 | goto drop_unlock; /* should never happen */ |
1033 | |
1034 | /* Is it a reply to our BOOTP request? */ |
1035 | if (b->op != BOOTP_REPLY || |
1036 | b->xid != d->xid) { |
1037 | net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n" , |
1038 | d->dev->name, b->op, b->xid); |
1039 | goto drop_unlock; |
1040 | } |
1041 | |
1042 | /* Parse extensions */ |
1043 | if (ext_len >= 4 && |
1044 | !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ |
1045 | u8 *end = (u8 *) b + ntohs(b->iph.tot_len); |
1046 | u8 *ext; |
1047 | |
1048 | #ifdef IPCONFIG_DHCP |
1049 | if (ic_proto_enabled & IC_USE_DHCP) { |
1050 | __be32 server_id = NONE; |
1051 | int mt = 0; |
1052 | |
1053 | ext = &b->exten[4]; |
1054 | while (ext < end && *ext != 0xff) { |
1055 | u8 *opt = ext++; |
1056 | if (*opt == 0) /* Padding */ |
1057 | continue; |
1058 | ext += *ext + 1; |
1059 | if (ext >= end) |
1060 | break; |
1061 | switch (*opt) { |
1062 | case 53: /* Message type */ |
1063 | if (opt[1]) |
1064 | mt = opt[2]; |
1065 | break; |
1066 | case 54: /* Server ID (IP address) */ |
1067 | if (opt[1] >= 4) |
1068 | memcpy(&server_id, opt + 2, 4); |
1069 | break; |
1070 | } |
1071 | } |
1072 | |
1073 | pr_debug("DHCP: Got message type %d (%s)\n" , mt, d->dev->name); |
1074 | |
1075 | switch (mt) { |
1076 | case DHCPOFFER: |
1077 | /* While in the process of accepting one offer, |
1078 | * ignore all others. |
1079 | */ |
1080 | if (ic_myaddr != NONE) |
1081 | goto drop_unlock; |
1082 | |
1083 | /* Let's accept that offer. */ |
1084 | ic_myaddr = b->your_ip; |
1085 | ic_servaddr = server_id; |
1086 | pr_debug("DHCP: Offered address %pI4 by server %pI4\n" , |
1087 | &ic_myaddr, &b->iph.saddr); |
1088 | /* The DHCP indicated server address takes |
1089 | * precedence over the bootp header one if |
1090 | * they are different. |
1091 | */ |
1092 | if ((server_id != NONE) && |
1093 | (b->server_ip != server_id)) |
1094 | b->server_ip = ic_servaddr; |
1095 | break; |
1096 | |
1097 | case DHCPACK: |
1098 | if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) |
1099 | goto drop_unlock; |
1100 | |
1101 | /* Yeah! */ |
1102 | break; |
1103 | |
1104 | default: |
1105 | /* Urque. Forget it*/ |
1106 | ic_myaddr = NONE; |
1107 | ic_servaddr = NONE; |
1108 | goto drop_unlock; |
1109 | } |
1110 | |
1111 | ic_dhcp_msgtype = mt; |
1112 | |
1113 | } |
1114 | #endif /* IPCONFIG_DHCP */ |
1115 | |
1116 | ext = &b->exten[4]; |
1117 | while (ext < end && *ext != 0xff) { |
1118 | u8 *opt = ext++; |
1119 | if (*opt == 0) /* Padding */ |
1120 | continue; |
1121 | ext += *ext + 1; |
1122 | if (ext < end) |
1123 | ic_do_bootp_ext(opt); |
1124 | } |
1125 | } |
1126 | |
1127 | /* We have a winner! */ |
1128 | ic_dev = d; |
1129 | ic_myaddr = b->your_ip; |
1130 | ic_servaddr = b->server_ip; |
1131 | ic_addrservaddr = b->iph.saddr; |
1132 | if (ic_gateway == NONE && b->relay_ip) |
1133 | ic_gateway = b->relay_ip; |
1134 | if (ic_nameservers[0] == NONE) |
1135 | ic_nameservers[0] = ic_servaddr; |
1136 | ic_got_reply = IC_BOOTP; |
1137 | |
1138 | drop_unlock: |
1139 | /* Show's over. Nothing to see here. */ |
1140 | spin_unlock(&ic_recv_lock); |
1141 | |
1142 | drop: |
1143 | /* Throw the packet out. */ |
1144 | kfree_skb(skb); |
1145 | |
1146 | return 0; |
1147 | } |
1148 | |
1149 | |
1150 | #endif |
1151 | |
1152 | |
1153 | /* |
1154 | * Dynamic IP configuration -- DHCP, BOOTP, RARP. |
1155 | */ |
1156 | |
1157 | #ifdef IPCONFIG_DYNAMIC |
1158 | |
1159 | static int __init ic_dynamic(void) |
1160 | { |
1161 | int retries; |
1162 | struct ic_device *d; |
1163 | unsigned long start_jiffies, timeout, jiff; |
1164 | int do_bootp = ic_proto_have_if & IC_BOOTP; |
1165 | int do_rarp = ic_proto_have_if & IC_RARP; |
1166 | |
1167 | /* |
1168 | * If none of DHCP/BOOTP/RARP was selected, return with an error. |
1169 | * This routine gets only called when some pieces of information |
1170 | * are missing, and without DHCP/BOOTP/RARP we are unable to get it. |
1171 | */ |
1172 | if (!ic_proto_enabled) { |
1173 | pr_err("IP-Config: Incomplete network configuration information\n" ); |
1174 | return -1; |
1175 | } |
1176 | |
1177 | #ifdef IPCONFIG_BOOTP |
1178 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) |
1179 | pr_err("DHCP/BOOTP: No suitable device found\n" ); |
1180 | #endif |
1181 | #ifdef IPCONFIG_RARP |
1182 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) |
1183 | pr_err("RARP: No suitable device found\n" ); |
1184 | #endif |
1185 | |
1186 | if (!ic_proto_have_if) |
1187 | /* Error message already printed */ |
1188 | return -1; |
1189 | |
1190 | /* |
1191 | * Setup protocols |
1192 | */ |
1193 | #ifdef IPCONFIG_BOOTP |
1194 | if (do_bootp) |
1195 | ic_bootp_init(); |
1196 | #endif |
1197 | #ifdef IPCONFIG_RARP |
1198 | if (do_rarp) |
1199 | ic_rarp_init(); |
1200 | #endif |
1201 | |
1202 | /* |
1203 | * Send requests and wait, until we get an answer. This loop |
1204 | * seems to be a terrible waste of CPU time, but actually there is |
1205 | * only one process running at all, so we don't need to use any |
1206 | * scheduler functions. |
1207 | * [Actually we could now, but the nothing else running note still |
1208 | * applies.. - AC] |
1209 | */ |
1210 | pr_notice("Sending %s%s%s requests ." , |
1211 | do_bootp |
1212 | ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP" ) : "" , |
1213 | (do_bootp && do_rarp) ? " and " : "" , |
1214 | do_rarp ? "RARP" : "" ); |
1215 | |
1216 | start_jiffies = jiffies; |
1217 | d = ic_first_dev; |
1218 | retries = CONF_SEND_RETRIES; |
1219 | get_random_bytes(&timeout, sizeof(timeout)); |
1220 | timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); |
1221 | for (;;) { |
1222 | #ifdef IPCONFIG_BOOTP |
1223 | if (do_bootp && (d->able & IC_BOOTP)) |
1224 | ic_bootp_send_if(d, jiffies - start_jiffies); |
1225 | #endif |
1226 | #ifdef IPCONFIG_RARP |
1227 | if (do_rarp && (d->able & IC_RARP)) |
1228 | ic_rarp_send_if(d); |
1229 | #endif |
1230 | |
1231 | if (!d->next) { |
1232 | jiff = jiffies + timeout; |
1233 | while (time_before(jiffies, jiff) && !ic_got_reply) |
1234 | schedule_timeout_uninterruptible(1); |
1235 | } |
1236 | #ifdef IPCONFIG_DHCP |
1237 | /* DHCP isn't done until we get a DHCPACK. */ |
1238 | if ((ic_got_reply & IC_BOOTP) && |
1239 | (ic_proto_enabled & IC_USE_DHCP) && |
1240 | ic_dhcp_msgtype != DHCPACK) { |
1241 | ic_got_reply = 0; |
1242 | /* continue on device that got the reply */ |
1243 | d = ic_dev; |
1244 | pr_cont("," ); |
1245 | continue; |
1246 | } |
1247 | #endif /* IPCONFIG_DHCP */ |
1248 | |
1249 | if (ic_got_reply) { |
1250 | pr_cont(" OK\n" ); |
1251 | break; |
1252 | } |
1253 | |
1254 | if ((d = d->next)) |
1255 | continue; |
1256 | |
1257 | if (! --retries) { |
1258 | pr_cont(" timed out!\n" ); |
1259 | break; |
1260 | } |
1261 | |
1262 | d = ic_first_dev; |
1263 | |
1264 | timeout = timeout CONF_TIMEOUT_MULT; |
1265 | if (timeout > CONF_TIMEOUT_MAX) |
1266 | timeout = CONF_TIMEOUT_MAX; |
1267 | |
1268 | pr_cont("." ); |
1269 | } |
1270 | |
1271 | #ifdef IPCONFIG_BOOTP |
1272 | if (do_bootp) |
1273 | ic_bootp_cleanup(); |
1274 | #endif |
1275 | #ifdef IPCONFIG_RARP |
1276 | if (do_rarp) |
1277 | ic_rarp_cleanup(); |
1278 | #endif |
1279 | |
1280 | if (!ic_got_reply) { |
1281 | ic_myaddr = NONE; |
1282 | return -1; |
1283 | } |
1284 | |
1285 | pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n" , |
1286 | ((ic_got_reply & IC_RARP) ? "RARP" |
1287 | : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP" ), |
1288 | &ic_addrservaddr, &ic_myaddr); |
1289 | |
1290 | return 0; |
1291 | } |
1292 | |
1293 | #endif /* IPCONFIG_DYNAMIC */ |
1294 | |
1295 | #ifdef CONFIG_PROC_FS |
1296 | /* proc_dir_entry for /proc/net/ipconfig */ |
1297 | static struct proc_dir_entry *ipconfig_dir; |
1298 | |
1299 | /* Name servers: */ |
1300 | static int pnp_seq_show(struct seq_file *seq, void *v) |
1301 | { |
1302 | int i; |
1303 | |
1304 | if (ic_proto_used & IC_PROTO) |
1305 | seq_printf(seq, "#PROTO: %s\n" , |
1306 | (ic_proto_used & IC_RARP) ? "RARP" |
1307 | : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP" ); |
1308 | else |
1309 | seq_puts(seq, "#MANUAL\n" ); |
1310 | |
1311 | if (ic_domain[0]) |
1312 | seq_printf(seq, |
1313 | "domain %s\n" , ic_domain); |
1314 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { |
1315 | if (ic_nameservers[i] != NONE) |
1316 | seq_printf(seq, "nameserver %pI4\n" , |
1317 | &ic_nameservers[i]); |
1318 | } |
1319 | if (ic_servaddr != NONE) |
1320 | seq_printf(seq, "bootserver %pI4\n" , |
1321 | &ic_servaddr); |
1322 | return 0; |
1323 | } |
1324 | |
1325 | /* Create the /proc/net/ipconfig directory */ |
1326 | static int __init ipconfig_proc_net_init(void) |
1327 | { |
1328 | ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig" , init_net.proc_net); |
1329 | if (!ipconfig_dir) |
1330 | return -ENOMEM; |
1331 | |
1332 | return 0; |
1333 | } |
1334 | |
1335 | /* Create a new file under /proc/net/ipconfig */ |
1336 | static int ipconfig_proc_net_create(const char *name, |
1337 | const struct file_operations *fops) |
1338 | { |
1339 | char *pname; |
1340 | struct proc_dir_entry *p; |
1341 | |
1342 | if (!ipconfig_dir) |
1343 | return -ENOMEM; |
1344 | |
1345 | pname = kasprintf(GFP_KERNEL, "%s%s" , "ipconfig/" , name); |
1346 | if (!pname) |
1347 | return -ENOMEM; |
1348 | |
1349 | p = proc_create(pname, 0444, init_net.proc_net, fops); |
1350 | kfree(pname); |
1351 | if (!p) |
1352 | return -ENOMEM; |
1353 | |
1354 | return 0; |
1355 | } |
1356 | |
1357 | /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ |
1358 | static int ntp_servers_seq_show(struct seq_file *seq, void *v) |
1359 | { |
1360 | int i; |
1361 | |
1362 | for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { |
1363 | if (ic_ntp_servers[i] != NONE) |
1364 | seq_printf(seq, "%pI4\n" , &ic_ntp_servers[i]); |
1365 | } |
1366 | return 0; |
1367 | } |
1368 | DEFINE_SHOW_ATTRIBUTE(ntp_servers_seq); |
1369 | #endif /* CONFIG_PROC_FS */ |
1370 | |
1371 | /* |
1372 | * Extract IP address from the parameter string if needed. Note that we |
1373 | * need to have root_server_addr set _before_ IPConfig gets called as it |
1374 | * can override it. |
1375 | */ |
1376 | __be32 __init root_nfs_parse_addr(char *name) |
1377 | { |
1378 | __be32 addr; |
1379 | int octets = 0; |
1380 | char *cp, *cq; |
1381 | |
1382 | cp = cq = name; |
1383 | while (octets < 4) { |
1384 | while (*cp >= '0' && *cp <= '9') |
1385 | cp++; |
1386 | if (cp == cq || cp - cq > 3) |
1387 | break; |
1388 | if (*cp == '.' || octets == 3) |
1389 | octets++; |
1390 | if (octets < 4) |
1391 | cp++; |
1392 | cq = cp; |
1393 | } |
1394 | if (octets == 4 && (*cp == ':' || *cp == '\0')) { |
1395 | if (*cp == ':') |
1396 | *cp++ = '\0'; |
1397 | addr = in_aton(name); |
1398 | memmove(name, cp, strlen(cp) + 1); |
1399 | } else |
1400 | addr = NONE; |
1401 | |
1402 | return addr; |
1403 | } |
1404 | |
1405 | #define DEVICE_WAIT_MAX 12 /* 12 seconds */ |
1406 | |
1407 | static int __init wait_for_devices(void) |
1408 | { |
1409 | int i; |
1410 | |
1411 | for (i = 0; i < DEVICE_WAIT_MAX; i++) { |
1412 | struct net_device *dev; |
1413 | int found = 0; |
1414 | |
1415 | rtnl_lock(); |
1416 | for_each_netdev(&init_net, dev) { |
1417 | if (ic_is_init_dev(dev)) { |
1418 | found = 1; |
1419 | break; |
1420 | } |
1421 | } |
1422 | rtnl_unlock(); |
1423 | if (found) |
1424 | return 0; |
1425 | ssleep(1); |
1426 | } |
1427 | return -ENODEV; |
1428 | } |
1429 | |
1430 | /* |
1431 | * IP Autoconfig dispatcher. |
1432 | */ |
1433 | |
1434 | static int __init ip_auto_config(void) |
1435 | { |
1436 | __be32 addr; |
1437 | #ifdef IPCONFIG_DYNAMIC |
1438 | int retries = CONF_OPEN_RETRIES; |
1439 | #endif |
1440 | int err; |
1441 | unsigned int i; |
1442 | |
1443 | /* Initialise all name servers and NTP servers to NONE (but only if the |
1444 | * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, |
1445 | * otherwise we'll overwrite the IP addresses specified there) |
1446 | */ |
1447 | if (ic_set_manually == 0) { |
1448 | ic_nameservers_predef(); |
1449 | ic_ntp_servers_predef(); |
1450 | } |
1451 | |
1452 | #ifdef CONFIG_PROC_FS |
1453 | proc_create_single("pnp" , 0444, init_net.proc_net, pnp_seq_show); |
1454 | |
1455 | if (ipconfig_proc_net_init() == 0) |
1456 | ipconfig_proc_net_create("ntp_servers" , &ntp_servers_seq_fops); |
1457 | #endif /* CONFIG_PROC_FS */ |
1458 | |
1459 | if (!ic_enable) |
1460 | return 0; |
1461 | |
1462 | pr_debug("IP-Config: Entered.\n" ); |
1463 | #ifdef IPCONFIG_DYNAMIC |
1464 | try_try_again: |
1465 | #endif |
1466 | /* Wait for devices to appear */ |
1467 | err = wait_for_devices(); |
1468 | if (err) |
1469 | return err; |
1470 | |
1471 | /* Setup all network devices */ |
1472 | err = ic_open_devs(); |
1473 | if (err) |
1474 | return err; |
1475 | |
1476 | /* Give drivers a chance to settle */ |
1477 | msleep(CONF_POST_OPEN); |
1478 | |
1479 | /* |
1480 | * If the config information is insufficient (e.g., our IP address or |
1481 | * IP address of the boot server is missing or we have multiple network |
1482 | * interfaces and no default was set), use BOOTP or RARP to get the |
1483 | * missing values. |
1484 | */ |
1485 | if (ic_myaddr == NONE || |
1486 | #ifdef CONFIG_ROOT_NFS |
1487 | (root_server_addr == NONE && |
1488 | ic_servaddr == NONE && |
1489 | ROOT_DEV == Root_NFS) || |
1490 | #endif |
1491 | ic_first_dev->next) { |
1492 | #ifdef IPCONFIG_DYNAMIC |
1493 | if (ic_dynamic() < 0) { |
1494 | ic_close_devs(); |
1495 | |
1496 | /* |
1497 | * I don't know why, but sometimes the |
1498 | * eepro100 driver (at least) gets upset and |
1499 | * doesn't work the first time it's opened. |
1500 | * But then if you close it and reopen it, it |
1501 | * works just fine. So we need to try that at |
1502 | * least once before giving up. |
1503 | * |
1504 | * Also, if the root will be NFS-mounted, we |
1505 | * have nowhere to go if DHCP fails. So we |
1506 | * just have to keep trying forever. |
1507 | * |
1508 | * -- Chip |
1509 | */ |
1510 | #ifdef CONFIG_ROOT_NFS |
1511 | if (ROOT_DEV == Root_NFS) { |
1512 | pr_err("IP-Config: Retrying forever (NFS root)...\n" ); |
1513 | goto try_try_again; |
1514 | } |
1515 | #endif |
1516 | |
1517 | if (--retries) { |
1518 | pr_err("IP-Config: Reopening network devices...\n" ); |
1519 | goto try_try_again; |
1520 | } |
1521 | |
1522 | /* Oh, well. At least we tried. */ |
1523 | pr_err("IP-Config: Auto-configuration of network failed\n" ); |
1524 | return -1; |
1525 | } |
1526 | #else /* !DYNAMIC */ |
1527 | pr_err("IP-Config: Incomplete network configuration information\n" ); |
1528 | ic_close_devs(); |
1529 | return -1; |
1530 | #endif /* IPCONFIG_DYNAMIC */ |
1531 | } else { |
1532 | /* Device selected manually or only one device -> use it */ |
1533 | ic_dev = ic_first_dev; |
1534 | } |
1535 | |
1536 | addr = root_nfs_parse_addr(root_server_path); |
1537 | if (root_server_addr == NONE) |
1538 | root_server_addr = addr; |
1539 | |
1540 | /* |
1541 | * Use defaults wherever applicable. |
1542 | */ |
1543 | if (ic_defaults() < 0) |
1544 | return -1; |
1545 | |
1546 | /* |
1547 | * Record which protocol was actually used. |
1548 | */ |
1549 | #ifdef IPCONFIG_DYNAMIC |
1550 | ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); |
1551 | #endif |
1552 | |
1553 | #ifndef IPCONFIG_SILENT |
1554 | /* |
1555 | * Clue in the operator. |
1556 | */ |
1557 | pr_info("IP-Config: Complete:\n" ); |
1558 | |
1559 | pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n" , |
1560 | ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, |
1561 | &ic_myaddr, &ic_netmask, &ic_gateway); |
1562 | pr_info(" host=%s, domain=%s, nis-domain=%s\n" , |
1563 | utsname()->nodename, ic_domain, utsname()->domainname); |
1564 | pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s" , |
1565 | &ic_servaddr, &root_server_addr, root_server_path); |
1566 | if (ic_dev_mtu) |
1567 | pr_cont(", mtu=%d" , ic_dev_mtu); |
1568 | /* Name servers (if any): */ |
1569 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { |
1570 | if (ic_nameservers[i] != NONE) { |
1571 | if (i == 0) |
1572 | pr_info(" nameserver%u=%pI4" , |
1573 | i, &ic_nameservers[i]); |
1574 | else |
1575 | pr_cont(", nameserver%u=%pI4" , |
1576 | i, &ic_nameservers[i]); |
1577 | } |
1578 | if (i + 1 == CONF_NAMESERVERS_MAX) |
1579 | pr_cont("\n" ); |
1580 | } |
1581 | /* NTP servers (if any): */ |
1582 | for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { |
1583 | if (ic_ntp_servers[i] != NONE) { |
1584 | if (i == 0) |
1585 | pr_info(" ntpserver%u=%pI4" , |
1586 | i, &ic_ntp_servers[i]); |
1587 | else |
1588 | pr_cont(", ntpserver%u=%pI4" , |
1589 | i, &ic_ntp_servers[i]); |
1590 | } |
1591 | if (i + 1 == CONF_NTP_SERVERS_MAX) |
1592 | pr_cont("\n" ); |
1593 | } |
1594 | #endif /* !SILENT */ |
1595 | |
1596 | /* |
1597 | * Close all network devices except the device we've |
1598 | * autoconfigured and set up routes. |
1599 | */ |
1600 | if (ic_setup_if() < 0 || ic_setup_routes() < 0) |
1601 | err = -1; |
1602 | else |
1603 | err = 0; |
1604 | |
1605 | ic_close_devs(); |
1606 | |
1607 | return err; |
1608 | } |
1609 | |
1610 | late_initcall(ip_auto_config); |
1611 | |
1612 | |
1613 | /* |
1614 | * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel |
1615 | * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. |
1616 | */ |
1617 | static int __init ic_proto_name(char *name) |
1618 | { |
1619 | if (!strcmp(name, "on" ) || !strcmp(name, "any" )) { |
1620 | return 1; |
1621 | } |
1622 | if (!strcmp(name, "off" ) || !strcmp(name, "none" )) { |
1623 | return 0; |
1624 | } |
1625 | #ifdef CONFIG_IP_PNP_DHCP |
1626 | else if (!strncmp(name, "dhcp" , 4)) { |
1627 | char *client_id; |
1628 | |
1629 | ic_proto_enabled &= ~IC_RARP; |
1630 | client_id = strstr(name, "dhcp," ); |
1631 | if (client_id) { |
1632 | char *v; |
1633 | |
1634 | client_id = client_id + 5; |
1635 | v = strchr(client_id, ','); |
1636 | if (!v) |
1637 | return 1; |
1638 | *v = 0; |
1639 | if (kstrtou8(client_id, 0, dhcp_client_identifier)) |
1640 | pr_debug("DHCP: Invalid client identifier type\n" ); |
1641 | strncpy(dhcp_client_identifier + 1, v + 1, 251); |
1642 | *v = ','; |
1643 | } |
1644 | return 1; |
1645 | } |
1646 | #endif |
1647 | #ifdef CONFIG_IP_PNP_BOOTP |
1648 | else if (!strcmp(name, "bootp" )) { |
1649 | ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); |
1650 | return 1; |
1651 | } |
1652 | #endif |
1653 | #ifdef CONFIG_IP_PNP_RARP |
1654 | else if (!strcmp(name, "rarp" )) { |
1655 | ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); |
1656 | return 1; |
1657 | } |
1658 | #endif |
1659 | #ifdef IPCONFIG_DYNAMIC |
1660 | else if (!strcmp(name, "both" )) { |
1661 | ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ |
1662 | return 1; |
1663 | } |
1664 | #endif |
1665 | return 0; |
1666 | } |
1667 | |
1668 | static int __init ip_auto_config_setup(char *addrs) |
1669 | { |
1670 | char *cp, *ip, *dp; |
1671 | int num = 0; |
1672 | |
1673 | ic_set_manually = 1; |
1674 | ic_enable = 1; |
1675 | |
1676 | /* |
1677 | * If any dhcp, bootp etc options are set, leave autoconfig on |
1678 | * and skip the below static IP processing. |
1679 | */ |
1680 | if (ic_proto_name(addrs)) |
1681 | return 1; |
1682 | |
1683 | /* If no static IP is given, turn off autoconfig and bail. */ |
1684 | if (*addrs == 0 || |
1685 | strcmp(addrs, "off" ) == 0 || |
1686 | strcmp(addrs, "none" ) == 0) { |
1687 | ic_enable = 0; |
1688 | return 1; |
1689 | } |
1690 | |
1691 | /* Initialise all name servers and NTP servers to NONE */ |
1692 | ic_nameservers_predef(); |
1693 | ic_ntp_servers_predef(); |
1694 | |
1695 | /* Parse string for static IP assignment. */ |
1696 | ip = addrs; |
1697 | while (ip && *ip) { |
1698 | if ((cp = strchr(ip, ':'))) |
1699 | *cp++ = '\0'; |
1700 | if (strlen(ip) > 0) { |
1701 | pr_debug("IP-Config: Parameter #%d: `%s'\n" , num, ip); |
1702 | switch (num) { |
1703 | case 0: |
1704 | if ((ic_myaddr = in_aton(ip)) == ANY) |
1705 | ic_myaddr = NONE; |
1706 | break; |
1707 | case 1: |
1708 | if ((ic_servaddr = in_aton(ip)) == ANY) |
1709 | ic_servaddr = NONE; |
1710 | break; |
1711 | case 2: |
1712 | if ((ic_gateway = in_aton(ip)) == ANY) |
1713 | ic_gateway = NONE; |
1714 | break; |
1715 | case 3: |
1716 | if ((ic_netmask = in_aton(ip)) == ANY) |
1717 | ic_netmask = NONE; |
1718 | break; |
1719 | case 4: |
1720 | if ((dp = strchr(ip, '.'))) { |
1721 | *dp++ = '\0'; |
1722 | strlcpy(utsname()->domainname, dp, |
1723 | sizeof(utsname()->domainname)); |
1724 | } |
1725 | strlcpy(utsname()->nodename, ip, |
1726 | sizeof(utsname()->nodename)); |
1727 | ic_host_name_set = 1; |
1728 | break; |
1729 | case 5: |
1730 | strlcpy(user_dev_name, ip, sizeof(user_dev_name)); |
1731 | break; |
1732 | case 6: |
1733 | if (ic_proto_name(ip) == 0 && |
1734 | ic_myaddr == NONE) { |
1735 | ic_enable = 0; |
1736 | } |
1737 | break; |
1738 | case 7: |
1739 | if (CONF_NAMESERVERS_MAX >= 1) { |
1740 | ic_nameservers[0] = in_aton(ip); |
1741 | if (ic_nameservers[0] == ANY) |
1742 | ic_nameservers[0] = NONE; |
1743 | } |
1744 | break; |
1745 | case 8: |
1746 | if (CONF_NAMESERVERS_MAX >= 2) { |
1747 | ic_nameservers[1] = in_aton(ip); |
1748 | if (ic_nameservers[1] == ANY) |
1749 | ic_nameservers[1] = NONE; |
1750 | } |
1751 | break; |
1752 | case 9: |
1753 | if (CONF_NTP_SERVERS_MAX >= 1) { |
1754 | ic_ntp_servers[0] = in_aton(ip); |
1755 | if (ic_ntp_servers[0] == ANY) |
1756 | ic_ntp_servers[0] = NONE; |
1757 | } |
1758 | break; |
1759 | } |
1760 | } |
1761 | ip = cp; |
1762 | num++; |
1763 | } |
1764 | |
1765 | return 1; |
1766 | } |
1767 | __setup("ip=" , ip_auto_config_setup); |
1768 | |
1769 | static int __init nfsaddrs_config_setup(char *addrs) |
1770 | { |
1771 | return ip_auto_config_setup(addrs); |
1772 | } |
1773 | __setup("nfsaddrs=" , nfsaddrs_config_setup); |
1774 | |
1775 | static int __init vendor_class_identifier_setup(char *addrs) |
1776 | { |
1777 | if (strlcpy(vendor_class_identifier, addrs, |
1778 | sizeof(vendor_class_identifier)) |
1779 | >= sizeof(vendor_class_identifier)) |
1780 | pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n" , |
1781 | vendor_class_identifier); |
1782 | return 1; |
1783 | } |
1784 | __setup("dhcpclass=" , vendor_class_identifier_setup); |
1785 | |
1786 | static int __init set_carrier_timeout(char *str) |
1787 | { |
1788 | ssize_t ret; |
1789 | |
1790 | if (!str) |
1791 | return 0; |
1792 | |
1793 | ret = kstrtouint(str, 0, &carrier_timeout); |
1794 | if (ret) |
1795 | return 0; |
1796 | |
1797 | return 1; |
1798 | } |
1799 | __setup("carrier_timeout=" , set_carrier_timeout); |
1800 | |