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[mirror_ubuntu-zesty-kernel.git] / net / ipv4 / ipconfig.c
1 /*
2 * $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
3 *
4 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
5 * user-supplied information to configure own IP address and routes.
6 *
7 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
8 *
9 * Derived from network configuration code in fs/nfs/nfsroot.c,
10 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
11 *
12 * BOOTP rewritten to construct and analyse packets itself instead
13 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
14 * -- MJ, December 1998
15 *
16 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
17 * initialization scheme.
18 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
19 *
20 * DHCP support added. To users this looks like a whole separate
21 * protocol, but we know it's just a bag on the side of BOOTP.
22 * -- Chip Salzenberg <chip@valinux.com>, May 2000
23 *
24 * Ported DHCP support from 2.2.16 to 2.4.0-test4
25 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
26 *
27 * Merged changes from 2.2.19 into 2.4.3
28 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
29 *
30 * Multiple Nameservers in /proc/net/pnp
31 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
32 */
33
34 #include <linux/types.h>
35 #include <linux/string.h>
36 #include <linux/kernel.h>
37 #include <linux/jiffies.h>
38 #include <linux/random.h>
39 #include <linux/init.h>
40 #include <linux/utsname.h>
41 #include <linux/in.h>
42 #include <linux/if.h>
43 #include <linux/inet.h>
44 #include <linux/inetdevice.h>
45 #include <linux/netdevice.h>
46 #include <linux/if_arp.h>
47 #include <linux/skbuff.h>
48 #include <linux/ip.h>
49 #include <linux/socket.h>
50 #include <linux/route.h>
51 #include <linux/udp.h>
52 #include <linux/proc_fs.h>
53 #include <linux/seq_file.h>
54 #include <linux/major.h>
55 #include <linux/root_dev.h>
56 #include <linux/delay.h>
57 #include <linux/nfs_fs.h>
58 #include <net/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_PRE_OPEN 500 /* Before opening: 1/2 second */
92 #define CONF_POST_OPEN 1 /* After opening: 1 second */
93
94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
95 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
96 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
97 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
98 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
99 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
103 - '3' from resolv.h */
104
105 #define NONE __constant_htonl(INADDR_NONE)
106
107 /*
108 * Public IP configuration
109 */
110
111 /* This is used by platforms which might be able to set the ipconfig
112 * variables using firmware environment vars. If this is set, it will
113 * ignore such firmware variables.
114 */
115 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
116
117 static int ic_enable __initdata = 0; /* IP config enabled? */
118
119 /* Protocol choice */
120 int ic_proto_enabled __initdata = 0
121 #ifdef IPCONFIG_BOOTP
122 | IC_BOOTP
123 #endif
124 #ifdef CONFIG_IP_PNP_DHCP
125 | IC_USE_DHCP
126 #endif
127 #ifdef IPCONFIG_RARP
128 | IC_RARP
129 #endif
130 ;
131
132 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
133
134 __be32 ic_myaddr = NONE; /* My IP address */
135 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
136 __be32 ic_gateway = NONE; /* Gateway IP address */
137
138 __be32 ic_servaddr = NONE; /* Boot server IP address */
139
140 __be32 root_server_addr = NONE; /* Address of NFS server */
141 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
142
143 /* Persistent data: */
144
145 static int ic_proto_used; /* Protocol used, if any */
146 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
147 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
148
149 /*
150 * Private state.
151 */
152
153 /* Name of user-selected boot device */
154 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
155
156 /* Protocols supported by available interfaces */
157 static int ic_proto_have_if __initdata = 0;
158
159 #ifdef IPCONFIG_DYNAMIC
160 static DEFINE_SPINLOCK(ic_recv_lock);
161 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
162 #endif
163 #ifdef IPCONFIG_DHCP
164 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
165 #endif
166
167
168 /*
169 * Network devices
170 */
171
172 struct ic_device {
173 struct ic_device *next;
174 struct net_device *dev;
175 unsigned short flags;
176 short able;
177 __be32 xid;
178 };
179
180 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
181 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
182
183 static int __init ic_open_devs(void)
184 {
185 struct ic_device *d, **last;
186 struct net_device *dev;
187 unsigned short oflags;
188
189 last = &ic_first_dev;
190 rtnl_lock();
191
192 /* bring loopback device up first */
193 if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0)
194 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name);
195
196 for_each_netdev(&init_net, dev) {
197 if (dev == &loopback_dev)
198 continue;
199 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
200 (!(dev->flags & IFF_LOOPBACK) &&
201 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
202 strncmp(dev->name, "dummy", 5))) {
203 int able = 0;
204 if (dev->mtu >= 364)
205 able |= IC_BOOTP;
206 else
207 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
208 if (!(dev->flags & IFF_NOARP))
209 able |= IC_RARP;
210 able &= ic_proto_enabled;
211 if (ic_proto_enabled && !able)
212 continue;
213 oflags = dev->flags;
214 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
215 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
216 continue;
217 }
218 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
219 rtnl_unlock();
220 return -1;
221 }
222 d->dev = dev;
223 *last = d;
224 last = &d->next;
225 d->flags = oflags;
226 d->able = able;
227 if (able & IC_BOOTP)
228 get_random_bytes(&d->xid, sizeof(__be32));
229 else
230 d->xid = 0;
231 ic_proto_have_if |= able;
232 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
233 dev->name, able, d->xid));
234 }
235 }
236 rtnl_unlock();
237
238 *last = NULL;
239
240 if (!ic_first_dev) {
241 if (user_dev_name[0])
242 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
243 else
244 printk(KERN_ERR "IP-Config: No network devices available.\n");
245 return -1;
246 }
247 return 0;
248 }
249
250 static void __init ic_close_devs(void)
251 {
252 struct ic_device *d, *next;
253 struct net_device *dev;
254
255 rtnl_lock();
256 next = ic_first_dev;
257 while ((d = next)) {
258 next = d->next;
259 dev = d->dev;
260 if (dev != ic_dev) {
261 DBG(("IP-Config: Downing %s\n", dev->name));
262 dev_change_flags(dev, d->flags);
263 }
264 kfree(d);
265 }
266 rtnl_unlock();
267 }
268
269 /*
270 * Interface to various network functions.
271 */
272
273 static inline void
274 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
275 {
276 sin->sin_family = AF_INET;
277 sin->sin_addr.s_addr = addr;
278 sin->sin_port = port;
279 }
280
281 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
282 {
283 int res;
284
285 mm_segment_t oldfs = get_fs();
286 set_fs(get_ds());
287 res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
288 set_fs(oldfs);
289 return res;
290 }
291
292 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
293 {
294 int res;
295
296 mm_segment_t oldfs = get_fs();
297 set_fs(get_ds());
298 res = ip_rt_ioctl(cmd, (void __user *) arg);
299 set_fs(oldfs);
300 return res;
301 }
302
303 /*
304 * Set up interface addresses and routes.
305 */
306
307 static int __init ic_setup_if(void)
308 {
309 struct ifreq ir;
310 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
311 int err;
312
313 memset(&ir, 0, sizeof(ir));
314 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
315 set_sockaddr(sin, ic_myaddr, 0);
316 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
317 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
318 return -1;
319 }
320 set_sockaddr(sin, ic_netmask, 0);
321 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
322 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
323 return -1;
324 }
325 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
326 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
327 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
328 return -1;
329 }
330 return 0;
331 }
332
333 static int __init ic_setup_routes(void)
334 {
335 /* No need to setup device routes, only the default route... */
336
337 if (ic_gateway != NONE) {
338 struct rtentry rm;
339 int err;
340
341 memset(&rm, 0, sizeof(rm));
342 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
343 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
344 return -1;
345 }
346 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
347 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
348 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
349 rm.rt_flags = RTF_UP | RTF_GATEWAY;
350 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
351 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
352 return -1;
353 }
354 }
355
356 return 0;
357 }
358
359 /*
360 * Fill in default values for all missing parameters.
361 */
362
363 static int __init ic_defaults(void)
364 {
365 /*
366 * At this point we have no userspace running so need not
367 * claim locks on system_utsname
368 */
369
370 if (!ic_host_name_set)
371 sprintf(init_utsname()->nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
372
373 if (root_server_addr == NONE)
374 root_server_addr = ic_servaddr;
375
376 if (ic_netmask == NONE) {
377 if (IN_CLASSA(ntohl(ic_myaddr)))
378 ic_netmask = htonl(IN_CLASSA_NET);
379 else if (IN_CLASSB(ntohl(ic_myaddr)))
380 ic_netmask = htonl(IN_CLASSB_NET);
381 else if (IN_CLASSC(ntohl(ic_myaddr)))
382 ic_netmask = htonl(IN_CLASSC_NET);
383 else {
384 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
385 NIPQUAD(ic_myaddr));
386 return -1;
387 }
388 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
389 }
390
391 return 0;
392 }
393
394 /*
395 * RARP support.
396 */
397
398 #ifdef IPCONFIG_RARP
399
400 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
401
402 static struct packet_type rarp_packet_type __initdata = {
403 .type = __constant_htons(ETH_P_RARP),
404 .func = ic_rarp_recv,
405 };
406
407 static inline void ic_rarp_init(void)
408 {
409 dev_add_pack(&rarp_packet_type);
410 }
411
412 static inline void ic_rarp_cleanup(void)
413 {
414 dev_remove_pack(&rarp_packet_type);
415 }
416
417 /*
418 * Process received RARP packet.
419 */
420 static int __init
421 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
422 {
423 struct arphdr *rarp;
424 unsigned char *rarp_ptr;
425 __be32 sip, tip;
426 unsigned char *sha, *tha; /* s for "source", t for "target" */
427 struct ic_device *d;
428
429 if (dev->nd_net != &init_net)
430 goto drop;
431
432 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
433 return NET_RX_DROP;
434
435 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
436 goto drop;
437
438 /* Basic sanity checks can be done without the lock. */
439 rarp = (struct arphdr *)skb_transport_header(skb);
440
441 /* If this test doesn't pass, it's not IP, or we should
442 * ignore it anyway.
443 */
444 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
445 goto drop;
446
447 /* If it's not a RARP reply, delete it. */
448 if (rarp->ar_op != htons(ARPOP_RREPLY))
449 goto drop;
450
451 /* If it's not Ethernet, delete it. */
452 if (rarp->ar_pro != htons(ETH_P_IP))
453 goto drop;
454
455 if (!pskb_may_pull(skb,
456 sizeof(struct arphdr) +
457 (2 * dev->addr_len) +
458 (2 * 4)))
459 goto drop;
460
461 /* OK, it is all there and looks valid, process... */
462 rarp = (struct arphdr *)skb_transport_header(skb);
463 rarp_ptr = (unsigned char *) (rarp + 1);
464
465 /* One reply at a time, please. */
466 spin_lock(&ic_recv_lock);
467
468 /* If we already have a reply, just drop the packet */
469 if (ic_got_reply)
470 goto drop_unlock;
471
472 /* Find the ic_device that the packet arrived on */
473 d = ic_first_dev;
474 while (d && d->dev != dev)
475 d = d->next;
476 if (!d)
477 goto drop_unlock; /* should never happen */
478
479 /* Extract variable-width fields */
480 sha = rarp_ptr;
481 rarp_ptr += dev->addr_len;
482 memcpy(&sip, rarp_ptr, 4);
483 rarp_ptr += 4;
484 tha = rarp_ptr;
485 rarp_ptr += dev->addr_len;
486 memcpy(&tip, rarp_ptr, 4);
487
488 /* Discard packets which are not meant for us. */
489 if (memcmp(tha, dev->dev_addr, dev->addr_len))
490 goto drop_unlock;
491
492 /* Discard packets which are not from specified server. */
493 if (ic_servaddr != NONE && ic_servaddr != sip)
494 goto drop_unlock;
495
496 /* We have a winner! */
497 ic_dev = dev;
498 if (ic_myaddr == NONE)
499 ic_myaddr = tip;
500 ic_servaddr = sip;
501 ic_got_reply = IC_RARP;
502
503 drop_unlock:
504 /* Show's over. Nothing to see here. */
505 spin_unlock(&ic_recv_lock);
506
507 drop:
508 /* Throw the packet out. */
509 kfree_skb(skb);
510 return 0;
511 }
512
513
514 /*
515 * Send RARP request packet over a single interface.
516 */
517 static void __init ic_rarp_send_if(struct ic_device *d)
518 {
519 struct net_device *dev = d->dev;
520 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
521 dev->dev_addr, dev->dev_addr);
522 }
523 #endif
524
525 /*
526 * DHCP/BOOTP support.
527 */
528
529 #ifdef IPCONFIG_BOOTP
530
531 struct bootp_pkt { /* BOOTP packet format */
532 struct iphdr iph; /* IP header */
533 struct udphdr udph; /* UDP header */
534 u8 op; /* 1=request, 2=reply */
535 u8 htype; /* HW address type */
536 u8 hlen; /* HW address length */
537 u8 hops; /* Used only by gateways */
538 __be32 xid; /* Transaction ID */
539 __be16 secs; /* Seconds since we started */
540 __be16 flags; /* Just what it says */
541 __be32 client_ip; /* Client's IP address if known */
542 __be32 your_ip; /* Assigned IP address */
543 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
544 __be32 relay_ip; /* IP address of BOOTP relay */
545 u8 hw_addr[16]; /* Client's HW address */
546 u8 serv_name[64]; /* Server host name */
547 u8 boot_file[128]; /* Name of boot file */
548 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
549 };
550
551 /* packet ops */
552 #define BOOTP_REQUEST 1
553 #define BOOTP_REPLY 2
554
555 /* DHCP message types */
556 #define DHCPDISCOVER 1
557 #define DHCPOFFER 2
558 #define DHCPREQUEST 3
559 #define DHCPDECLINE 4
560 #define DHCPACK 5
561 #define DHCPNAK 6
562 #define DHCPRELEASE 7
563 #define DHCPINFORM 8
564
565 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
566
567 static struct packet_type bootp_packet_type __initdata = {
568 .type = __constant_htons(ETH_P_IP),
569 .func = ic_bootp_recv,
570 };
571
572
573 /*
574 * Initialize DHCP/BOOTP extension fields in the request.
575 */
576
577 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
578
579 #ifdef IPCONFIG_DHCP
580
581 static void __init
582 ic_dhcp_init_options(u8 *options)
583 {
584 u8 mt = ((ic_servaddr == NONE)
585 ? DHCPDISCOVER : DHCPREQUEST);
586 u8 *e = options;
587
588 #ifdef IPCONFIG_DEBUG
589 printk("DHCP: Sending message type %d\n", mt);
590 #endif
591
592 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
593 e += 4;
594
595 *e++ = 53; /* DHCP message type */
596 *e++ = 1;
597 *e++ = mt;
598
599 if (mt == DHCPREQUEST) {
600 *e++ = 54; /* Server ID (IP address) */
601 *e++ = 4;
602 memcpy(e, &ic_servaddr, 4);
603 e += 4;
604
605 *e++ = 50; /* Requested IP address */
606 *e++ = 4;
607 memcpy(e, &ic_myaddr, 4);
608 e += 4;
609 }
610
611 /* always? */
612 {
613 static const u8 ic_req_params[] = {
614 1, /* Subnet mask */
615 3, /* Default gateway */
616 6, /* DNS server */
617 12, /* Host name */
618 15, /* Domain name */
619 17, /* Boot path */
620 40, /* NIS domain name */
621 };
622
623 *e++ = 55; /* Parameter request list */
624 *e++ = sizeof(ic_req_params);
625 memcpy(e, ic_req_params, sizeof(ic_req_params));
626 e += sizeof(ic_req_params);
627 }
628
629 *e++ = 255; /* End of the list */
630 }
631
632 #endif /* IPCONFIG_DHCP */
633
634 static void __init ic_bootp_init_ext(u8 *e)
635 {
636 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
637 e += 4;
638 *e++ = 1; /* Subnet mask request */
639 *e++ = 4;
640 e += 4;
641 *e++ = 3; /* Default gateway request */
642 *e++ = 4;
643 e += 4;
644 *e++ = 5; /* Name server request */
645 *e++ = 8;
646 e += 8;
647 *e++ = 12; /* Host name request */
648 *e++ = 32;
649 e += 32;
650 *e++ = 40; /* NIS Domain name request */
651 *e++ = 32;
652 e += 32;
653 *e++ = 17; /* Boot path */
654 *e++ = 40;
655 e += 40;
656
657 *e++ = 57; /* set extension buffer size for reply */
658 *e++ = 2;
659 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
660 *e++ = 150;
661
662 *e++ = 255; /* End of the list */
663 }
664
665
666 /*
667 * Initialize the DHCP/BOOTP mechanism.
668 */
669 static inline void ic_bootp_init(void)
670 {
671 int i;
672
673 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
674 ic_nameservers[i] = NONE;
675
676 dev_add_pack(&bootp_packet_type);
677 }
678
679
680 /*
681 * DHCP/BOOTP cleanup.
682 */
683 static inline void ic_bootp_cleanup(void)
684 {
685 dev_remove_pack(&bootp_packet_type);
686 }
687
688
689 /*
690 * Send DHCP/BOOTP request to single interface.
691 */
692 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
693 {
694 struct net_device *dev = d->dev;
695 struct sk_buff *skb;
696 struct bootp_pkt *b;
697 int hh_len = LL_RESERVED_SPACE(dev);
698 struct iphdr *h;
699
700 /* Allocate packet */
701 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
702 if (!skb)
703 return;
704 skb_reserve(skb, hh_len);
705 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
706 memset(b, 0, sizeof(struct bootp_pkt));
707
708 /* Construct IP header */
709 skb_reset_network_header(skb);
710 h = ip_hdr(skb);
711 h->version = 4;
712 h->ihl = 5;
713 h->tot_len = htons(sizeof(struct bootp_pkt));
714 h->frag_off = htons(IP_DF);
715 h->ttl = 64;
716 h->protocol = IPPROTO_UDP;
717 h->daddr = htonl(INADDR_BROADCAST);
718 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
719
720 /* Construct UDP header */
721 b->udph.source = htons(68);
722 b->udph.dest = htons(67);
723 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
724 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
725
726 /* Construct DHCP/BOOTP header */
727 b->op = BOOTP_REQUEST;
728 if (dev->type < 256) /* check for false types */
729 b->htype = dev->type;
730 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
731 b->htype = ARPHRD_IEEE802;
732 else if (dev->type == ARPHRD_FDDI)
733 b->htype = ARPHRD_ETHER;
734 else {
735 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
736 b->htype = dev->type; /* can cause undefined behavior */
737 }
738 b->hlen = dev->addr_len;
739 b->your_ip = NONE;
740 b->server_ip = NONE;
741 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
742 b->secs = htons(jiffies_diff / HZ);
743 b->xid = d->xid;
744
745 /* add DHCP options or BOOTP extensions */
746 #ifdef IPCONFIG_DHCP
747 if (ic_proto_enabled & IC_USE_DHCP)
748 ic_dhcp_init_options(b->exten);
749 else
750 #endif
751 ic_bootp_init_ext(b->exten);
752
753 /* Chain packet down the line... */
754 skb->dev = dev;
755 skb->protocol = htons(ETH_P_IP);
756 if ((dev->hard_header &&
757 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
758 dev_queue_xmit(skb) < 0)
759 printk("E");
760 }
761
762
763 /*
764 * Copy BOOTP-supplied string if not already set.
765 */
766 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
767 {
768 if (!len)
769 return 0;
770 if (len > max-1)
771 len = max-1;
772 memcpy(dest, src, len);
773 dest[len] = '\0';
774 return 1;
775 }
776
777
778 /*
779 * Process BOOTP extensions.
780 */
781 static void __init ic_do_bootp_ext(u8 *ext)
782 {
783 u8 servers;
784 int i;
785
786 #ifdef IPCONFIG_DEBUG
787 u8 *c;
788
789 printk("DHCP/BOOTP: Got extension %d:",*ext);
790 for (c=ext+2; c<ext+2+ext[1]; c++)
791 printk(" %02x", *c);
792 printk("\n");
793 #endif
794
795 switch (*ext++) {
796 case 1: /* Subnet mask */
797 if (ic_netmask == NONE)
798 memcpy(&ic_netmask, ext+1, 4);
799 break;
800 case 3: /* Default gateway */
801 if (ic_gateway == NONE)
802 memcpy(&ic_gateway, ext+1, 4);
803 break;
804 case 6: /* DNS server */
805 servers= *ext/4;
806 if (servers > CONF_NAMESERVERS_MAX)
807 servers = CONF_NAMESERVERS_MAX;
808 for (i = 0; i < servers; i++) {
809 if (ic_nameservers[i] == NONE)
810 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
811 }
812 break;
813 case 12: /* Host name */
814 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
815 ic_host_name_set = 1;
816 break;
817 case 15: /* Domain name (DNS) */
818 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
819 break;
820 case 17: /* Root path */
821 if (!root_server_path[0])
822 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
823 break;
824 case 40: /* NIS Domain name (_not_ DNS) */
825 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
826 break;
827 }
828 }
829
830
831 /*
832 * Receive BOOTP reply.
833 */
834 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
835 {
836 struct bootp_pkt *b;
837 struct iphdr *h;
838 struct ic_device *d;
839 int len, ext_len;
840
841 if (dev->nd_net != &init_net)
842 goto drop;
843
844 /* Perform verifications before taking the lock. */
845 if (skb->pkt_type == PACKET_OTHERHOST)
846 goto drop;
847
848 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
849 return NET_RX_DROP;
850
851 if (!pskb_may_pull(skb,
852 sizeof(struct iphdr) +
853 sizeof(struct udphdr)))
854 goto drop;
855
856 b = (struct bootp_pkt *)skb_network_header(skb);
857 h = &b->iph;
858
859 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
860 goto drop;
861
862 /* Fragments are not supported */
863 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
864 if (net_ratelimit())
865 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
866 "reply.\n");
867 goto drop;
868 }
869
870 if (skb->len < ntohs(h->tot_len))
871 goto drop;
872
873 if (ip_fast_csum((char *) h, h->ihl))
874 goto drop;
875
876 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
877 goto drop;
878
879 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
880 goto drop;
881
882 len = ntohs(b->udph.len) - sizeof(struct udphdr);
883 ext_len = len - (sizeof(*b) -
884 sizeof(struct iphdr) -
885 sizeof(struct udphdr) -
886 sizeof(b->exten));
887 if (ext_len < 0)
888 goto drop;
889
890 /* Ok the front looks good, make sure we can get at the rest. */
891 if (!pskb_may_pull(skb, skb->len))
892 goto drop;
893
894 b = (struct bootp_pkt *)skb_network_header(skb);
895 h = &b->iph;
896
897 /* One reply at a time, please. */
898 spin_lock(&ic_recv_lock);
899
900 /* If we already have a reply, just drop the packet */
901 if (ic_got_reply)
902 goto drop_unlock;
903
904 /* Find the ic_device that the packet arrived on */
905 d = ic_first_dev;
906 while (d && d->dev != dev)
907 d = d->next;
908 if (!d)
909 goto drop_unlock; /* should never happen */
910
911 /* Is it a reply to our BOOTP request? */
912 if (b->op != BOOTP_REPLY ||
913 b->xid != d->xid) {
914 if (net_ratelimit())
915 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
916 "op[%x] xid[%x]\n",
917 b->op, b->xid);
918 goto drop_unlock;
919 }
920
921 /* Parse extensions */
922 if (ext_len >= 4 &&
923 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
924 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
925 u8 *ext;
926
927 #ifdef IPCONFIG_DHCP
928 if (ic_proto_enabled & IC_USE_DHCP) {
929 __be32 server_id = NONE;
930 int mt = 0;
931
932 ext = &b->exten[4];
933 while (ext < end && *ext != 0xff) {
934 u8 *opt = ext++;
935 if (*opt == 0) /* Padding */
936 continue;
937 ext += *ext + 1;
938 if (ext >= end)
939 break;
940 switch (*opt) {
941 case 53: /* Message type */
942 if (opt[1])
943 mt = opt[2];
944 break;
945 case 54: /* Server ID (IP address) */
946 if (opt[1] >= 4)
947 memcpy(&server_id, opt + 2, 4);
948 break;
949 }
950 }
951
952 #ifdef IPCONFIG_DEBUG
953 printk("DHCP: Got message type %d\n", mt);
954 #endif
955
956 switch (mt) {
957 case DHCPOFFER:
958 /* While in the process of accepting one offer,
959 * ignore all others.
960 */
961 if (ic_myaddr != NONE)
962 goto drop_unlock;
963
964 /* Let's accept that offer. */
965 ic_myaddr = b->your_ip;
966 ic_servaddr = server_id;
967 #ifdef IPCONFIG_DEBUG
968 printk("DHCP: Offered address %u.%u.%u.%u",
969 NIPQUAD(ic_myaddr));
970 printk(" by server %u.%u.%u.%u\n",
971 NIPQUAD(ic_servaddr));
972 #endif
973 /* The DHCP indicated server address takes
974 * precedence over the bootp header one if
975 * they are different.
976 */
977 if ((server_id != NONE) &&
978 (b->server_ip != server_id))
979 b->server_ip = ic_servaddr;
980 break;
981
982 case DHCPACK:
983 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
984 goto drop_unlock;
985
986 /* Yeah! */
987 break;
988
989 default:
990 /* Urque. Forget it*/
991 ic_myaddr = NONE;
992 ic_servaddr = NONE;
993 goto drop_unlock;
994 }
995
996 ic_dhcp_msgtype = mt;
997
998 }
999 #endif /* IPCONFIG_DHCP */
1000
1001 ext = &b->exten[4];
1002 while (ext < end && *ext != 0xff) {
1003 u8 *opt = ext++;
1004 if (*opt == 0) /* Padding */
1005 continue;
1006 ext += *ext + 1;
1007 if (ext < end)
1008 ic_do_bootp_ext(opt);
1009 }
1010 }
1011
1012 /* We have a winner! */
1013 ic_dev = dev;
1014 ic_myaddr = b->your_ip;
1015 ic_servaddr = b->server_ip;
1016 if (ic_gateway == NONE && b->relay_ip)
1017 ic_gateway = b->relay_ip;
1018 if (ic_nameservers[0] == NONE)
1019 ic_nameservers[0] = ic_servaddr;
1020 ic_got_reply = IC_BOOTP;
1021
1022 drop_unlock:
1023 /* Show's over. Nothing to see here. */
1024 spin_unlock(&ic_recv_lock);
1025
1026 drop:
1027 /* Throw the packet out. */
1028 kfree_skb(skb);
1029
1030 return 0;
1031 }
1032
1033
1034 #endif
1035
1036
1037 /*
1038 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1039 */
1040
1041 #ifdef IPCONFIG_DYNAMIC
1042
1043 static int __init ic_dynamic(void)
1044 {
1045 int retries;
1046 struct ic_device *d;
1047 unsigned long start_jiffies, timeout, jiff;
1048 int do_bootp = ic_proto_have_if & IC_BOOTP;
1049 int do_rarp = ic_proto_have_if & IC_RARP;
1050
1051 /*
1052 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1053 * This routine gets only called when some pieces of information
1054 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1055 */
1056 if (!ic_proto_enabled) {
1057 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1058 return -1;
1059 }
1060
1061 #ifdef IPCONFIG_BOOTP
1062 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1063 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1064 #endif
1065 #ifdef IPCONFIG_RARP
1066 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1067 printk(KERN_ERR "RARP: No suitable device found.\n");
1068 #endif
1069
1070 if (!ic_proto_have_if)
1071 /* Error message already printed */
1072 return -1;
1073
1074 /*
1075 * Setup protocols
1076 */
1077 #ifdef IPCONFIG_BOOTP
1078 if (do_bootp)
1079 ic_bootp_init();
1080 #endif
1081 #ifdef IPCONFIG_RARP
1082 if (do_rarp)
1083 ic_rarp_init();
1084 #endif
1085
1086 /*
1087 * Send requests and wait, until we get an answer. This loop
1088 * seems to be a terrible waste of CPU time, but actually there is
1089 * only one process running at all, so we don't need to use any
1090 * scheduler functions.
1091 * [Actually we could now, but the nothing else running note still
1092 * applies.. - AC]
1093 */
1094 printk(KERN_NOTICE "Sending %s%s%s requests .",
1095 do_bootp
1096 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1097 (do_bootp && do_rarp) ? " and " : "",
1098 do_rarp ? "RARP" : "");
1099
1100 start_jiffies = jiffies;
1101 d = ic_first_dev;
1102 retries = CONF_SEND_RETRIES;
1103 get_random_bytes(&timeout, sizeof(timeout));
1104 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1105 for (;;) {
1106 #ifdef IPCONFIG_BOOTP
1107 if (do_bootp && (d->able & IC_BOOTP))
1108 ic_bootp_send_if(d, jiffies - start_jiffies);
1109 #endif
1110 #ifdef IPCONFIG_RARP
1111 if (do_rarp && (d->able & IC_RARP))
1112 ic_rarp_send_if(d);
1113 #endif
1114
1115 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1116 while (time_before(jiffies, jiff) && !ic_got_reply)
1117 schedule_timeout_uninterruptible(1);
1118 #ifdef IPCONFIG_DHCP
1119 /* DHCP isn't done until we get a DHCPACK. */
1120 if ((ic_got_reply & IC_BOOTP)
1121 && (ic_proto_enabled & IC_USE_DHCP)
1122 && ic_dhcp_msgtype != DHCPACK)
1123 {
1124 ic_got_reply = 0;
1125 printk(",");
1126 continue;
1127 }
1128 #endif /* IPCONFIG_DHCP */
1129
1130 if (ic_got_reply) {
1131 printk(" OK\n");
1132 break;
1133 }
1134
1135 if ((d = d->next))
1136 continue;
1137
1138 if (! --retries) {
1139 printk(" timed out!\n");
1140 break;
1141 }
1142
1143 d = ic_first_dev;
1144
1145 timeout = timeout CONF_TIMEOUT_MULT;
1146 if (timeout > CONF_TIMEOUT_MAX)
1147 timeout = CONF_TIMEOUT_MAX;
1148
1149 printk(".");
1150 }
1151
1152 #ifdef IPCONFIG_BOOTP
1153 if (do_bootp)
1154 ic_bootp_cleanup();
1155 #endif
1156 #ifdef IPCONFIG_RARP
1157 if (do_rarp)
1158 ic_rarp_cleanup();
1159 #endif
1160
1161 if (!ic_got_reply) {
1162 ic_myaddr = NONE;
1163 return -1;
1164 }
1165
1166 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1167 ((ic_got_reply & IC_RARP) ? "RARP"
1168 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1169 NIPQUAD(ic_servaddr));
1170 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1171
1172 return 0;
1173 }
1174
1175 #endif /* IPCONFIG_DYNAMIC */
1176
1177 #ifdef CONFIG_PROC_FS
1178
1179 static int pnp_seq_show(struct seq_file *seq, void *v)
1180 {
1181 int i;
1182
1183 if (ic_proto_used & IC_PROTO)
1184 seq_printf(seq, "#PROTO: %s\n",
1185 (ic_proto_used & IC_RARP) ? "RARP"
1186 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1187 else
1188 seq_puts(seq, "#MANUAL\n");
1189
1190 if (ic_domain[0])
1191 seq_printf(seq,
1192 "domain %s\n", ic_domain);
1193 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1194 if (ic_nameservers[i] != NONE)
1195 seq_printf(seq,
1196 "nameserver %u.%u.%u.%u\n",
1197 NIPQUAD(ic_nameservers[i]));
1198 }
1199 if (ic_servaddr != NONE)
1200 seq_printf(seq,
1201 "bootserver %u.%u.%u.%u\n",
1202 NIPQUAD(ic_servaddr));
1203 return 0;
1204 }
1205
1206 static int pnp_seq_open(struct inode *indoe, struct file *file)
1207 {
1208 return single_open(file, pnp_seq_show, NULL);
1209 }
1210
1211 static const struct file_operations pnp_seq_fops = {
1212 .owner = THIS_MODULE,
1213 .open = pnp_seq_open,
1214 .read = seq_read,
1215 .llseek = seq_lseek,
1216 .release = single_release,
1217 };
1218 #endif /* CONFIG_PROC_FS */
1219
1220 /*
1221 * Extract IP address from the parameter string if needed. Note that we
1222 * need to have root_server_addr set _before_ IPConfig gets called as it
1223 * can override it.
1224 */
1225 __be32 __init root_nfs_parse_addr(char *name)
1226 {
1227 __be32 addr;
1228 int octets = 0;
1229 char *cp, *cq;
1230
1231 cp = cq = name;
1232 while (octets < 4) {
1233 while (*cp >= '0' && *cp <= '9')
1234 cp++;
1235 if (cp == cq || cp - cq > 3)
1236 break;
1237 if (*cp == '.' || octets == 3)
1238 octets++;
1239 if (octets < 4)
1240 cp++;
1241 cq = cp;
1242 }
1243 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1244 if (*cp == ':')
1245 *cp++ = '\0';
1246 addr = in_aton(name);
1247 memmove(name, cp, strlen(cp) + 1);
1248 } else
1249 addr = NONE;
1250
1251 return addr;
1252 }
1253
1254 /*
1255 * IP Autoconfig dispatcher.
1256 */
1257
1258 static int __init ip_auto_config(void)
1259 {
1260 __be32 addr;
1261
1262 #ifdef CONFIG_PROC_FS
1263 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1264 #endif /* CONFIG_PROC_FS */
1265
1266 if (!ic_enable)
1267 return 0;
1268
1269 DBG(("IP-Config: Entered.\n"));
1270 #ifdef IPCONFIG_DYNAMIC
1271 try_try_again:
1272 #endif
1273 /* Give hardware a chance to settle */
1274 msleep(CONF_PRE_OPEN);
1275
1276 /* Setup all network devices */
1277 if (ic_open_devs() < 0)
1278 return -1;
1279
1280 /* Give drivers a chance to settle */
1281 ssleep(CONF_POST_OPEN);
1282
1283 /*
1284 * If the config information is insufficient (e.g., our IP address or
1285 * IP address of the boot server is missing or we have multiple network
1286 * interfaces and no default was set), use BOOTP or RARP to get the
1287 * missing values.
1288 */
1289 if (ic_myaddr == NONE ||
1290 #ifdef CONFIG_ROOT_NFS
1291 (root_server_addr == NONE
1292 && ic_servaddr == NONE
1293 && ROOT_DEV == Root_NFS) ||
1294 #endif
1295 ic_first_dev->next) {
1296 #ifdef IPCONFIG_DYNAMIC
1297
1298 int retries = CONF_OPEN_RETRIES;
1299
1300 if (ic_dynamic() < 0) {
1301 ic_close_devs();
1302
1303 /*
1304 * I don't know why, but sometimes the
1305 * eepro100 driver (at least) gets upset and
1306 * doesn't work the first time it's opened.
1307 * But then if you close it and reopen it, it
1308 * works just fine. So we need to try that at
1309 * least once before giving up.
1310 *
1311 * Also, if the root will be NFS-mounted, we
1312 * have nowhere to go if DHCP fails. So we
1313 * just have to keep trying forever.
1314 *
1315 * -- Chip
1316 */
1317 #ifdef CONFIG_ROOT_NFS
1318 if (ROOT_DEV == Root_NFS) {
1319 printk(KERN_ERR
1320 "IP-Config: Retrying forever (NFS root)...\n");
1321 goto try_try_again;
1322 }
1323 #endif
1324
1325 if (--retries) {
1326 printk(KERN_ERR
1327 "IP-Config: Reopening network devices...\n");
1328 goto try_try_again;
1329 }
1330
1331 /* Oh, well. At least we tried. */
1332 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1333 return -1;
1334 }
1335 #else /* !DYNAMIC */
1336 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1337 ic_close_devs();
1338 return -1;
1339 #endif /* IPCONFIG_DYNAMIC */
1340 } else {
1341 /* Device selected manually or only one device -> use it */
1342 ic_dev = ic_first_dev->dev;
1343 }
1344
1345 addr = root_nfs_parse_addr(root_server_path);
1346 if (root_server_addr == NONE)
1347 root_server_addr = addr;
1348
1349 /*
1350 * Use defaults whereever applicable.
1351 */
1352 if (ic_defaults() < 0)
1353 return -1;
1354
1355 /*
1356 * Close all network devices except the device we've
1357 * autoconfigured and set up routes.
1358 */
1359 ic_close_devs();
1360 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1361 return -1;
1362
1363 /*
1364 * Record which protocol was actually used.
1365 */
1366 #ifdef IPCONFIG_DYNAMIC
1367 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1368 #endif
1369
1370 #ifndef IPCONFIG_SILENT
1371 /*
1372 * Clue in the operator.
1373 */
1374 printk("IP-Config: Complete:");
1375 printk("\n device=%s", ic_dev->name);
1376 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1377 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1378 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1379 printk(",\n host=%s, domain=%s, nis-domain=%s",
1380 utsname()->nodename, ic_domain, utsname()->domainname);
1381 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1382 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1383 printk(", rootpath=%s", root_server_path);
1384 printk("\n");
1385 #endif /* !SILENT */
1386
1387 return 0;
1388 }
1389
1390 late_initcall(ip_auto_config);
1391
1392
1393 /*
1394 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1395 * command line parameter. It consists of option fields separated by colons in
1396 * the following order:
1397 *
1398 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1399 *
1400 * Any of the fields can be empty which means to use a default value:
1401 * <client-ip> - address given by BOOTP or RARP
1402 * <server-ip> - address of host returning BOOTP or RARP packet
1403 * <gw-ip> - none, or the address returned by BOOTP
1404 * <netmask> - automatically determined from <client-ip>, or the
1405 * one returned by BOOTP
1406 * <host name> - <client-ip> in ASCII notation, or the name returned
1407 * by BOOTP
1408 * <device> - use all available devices
1409 * <PROTO>:
1410 * off|none - don't do autoconfig at all (DEFAULT)
1411 * on|any - use any configured protocol
1412 * dhcp|bootp|rarp - use only the specified protocol
1413 * both - use both BOOTP and RARP (not DHCP)
1414 */
1415 static int __init ic_proto_name(char *name)
1416 {
1417 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1418 return 1;
1419 }
1420 #ifdef CONFIG_IP_PNP_DHCP
1421 else if (!strcmp(name, "dhcp")) {
1422 ic_proto_enabled &= ~IC_RARP;
1423 return 1;
1424 }
1425 #endif
1426 #ifdef CONFIG_IP_PNP_BOOTP
1427 else if (!strcmp(name, "bootp")) {
1428 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1429 return 1;
1430 }
1431 #endif
1432 #ifdef CONFIG_IP_PNP_RARP
1433 else if (!strcmp(name, "rarp")) {
1434 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1435 return 1;
1436 }
1437 #endif
1438 #ifdef IPCONFIG_DYNAMIC
1439 else if (!strcmp(name, "both")) {
1440 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1441 return 1;
1442 }
1443 #endif
1444 return 0;
1445 }
1446
1447 static int __init ip_auto_config_setup(char *addrs)
1448 {
1449 char *cp, *ip, *dp;
1450 int num = 0;
1451
1452 ic_set_manually = 1;
1453
1454 ic_enable = (*addrs &&
1455 (strcmp(addrs, "off") != 0) &&
1456 (strcmp(addrs, "none") != 0));
1457 if (!ic_enable)
1458 return 1;
1459
1460 if (ic_proto_name(addrs))
1461 return 1;
1462
1463 /* Parse the whole string */
1464 ip = addrs;
1465 while (ip && *ip) {
1466 if ((cp = strchr(ip, ':')))
1467 *cp++ = '\0';
1468 if (strlen(ip) > 0) {
1469 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1470 switch (num) {
1471 case 0:
1472 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1473 ic_myaddr = NONE;
1474 break;
1475 case 1:
1476 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1477 ic_servaddr = NONE;
1478 break;
1479 case 2:
1480 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1481 ic_gateway = NONE;
1482 break;
1483 case 3:
1484 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1485 ic_netmask = NONE;
1486 break;
1487 case 4:
1488 if ((dp = strchr(ip, '.'))) {
1489 *dp++ = '\0';
1490 strlcpy(utsname()->domainname, dp,
1491 sizeof(utsname()->domainname));
1492 }
1493 strlcpy(utsname()->nodename, ip,
1494 sizeof(utsname()->nodename));
1495 ic_host_name_set = 1;
1496 break;
1497 case 5:
1498 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1499 break;
1500 case 6:
1501 ic_proto_name(ip);
1502 break;
1503 }
1504 }
1505 ip = cp;
1506 num++;
1507 }
1508
1509 return 1;
1510 }
1511
1512 static int __init nfsaddrs_config_setup(char *addrs)
1513 {
1514 return ip_auto_config_setup(addrs);
1515 }
1516
1517 __setup("ip=", ip_auto_config_setup);
1518 __setup("nfsaddrs=", nfsaddrs_config_setup);
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