1 /*
2 * $Id: ipconfig.c,v 1.34 2000/07/26 01:04:18 davem Exp $
3 *
4 * Automatic Configuration of IP -- use BOOTP or RARP or user-supplied
5 * 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
21 #include <linux/config.h>
22 #include <linux/types.h>
23 #include <linux/string.h>
24 #include <linux/kernel.h>
25 #include <linux/sched.h>
26 #include <linux/random.h>
27 #include <linux/init.h>
28 #include <linux/utsname.h>
29 #include <linux/in.h>
30 #include <linux/if.h>
31 #include <linux/inet.h>
32 #include <linux/netdevice.h>
33 #include <linux/if_arp.h>
34 #include <linux/skbuff.h>
35 #include <linux/ip.h>
36 #include <linux/socket.h>
37 #include <linux/route.h>
38 #include <linux/udp.h>
39 #include <net/arp.h>
40 #include <net/ip.h>
41 #include <net/ipconfig.h>
42
43 #include <asm/uaccess.h>
44 #include <asm/checksum.h>
45
46 /* Define this to allow debugging output */
47 #undef IPCONFIG_DEBUG
48
49 #ifdef IPCONFIG_DEBUG
50 #define DBG(x) printk x
51 #else
52 #define DBG(x) do { } while(0)
53 #endif
54
55 /* Define the timeout for waiting for a RARP/BOOTP reply */
56 #define CONF_BASE_TIMEOUT (HZ*5) /* Initial timeout: 5 seconds */
57 #define CONF_RETRIES 10 /* 10 retries */
58 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
59 #define CONF_TIMEOUT_MULT *5/4 /* Rate of timeout growth */
60 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
61
62 /* IP configuration */
63 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };/* Name of user-selected boot device */
64 u32 ic_myaddr __initdata = INADDR_NONE; /* My IP address */
65 u32 ic_servaddr __initdata = INADDR_NONE; /* Server IP address */
66 u32 ic_gateway __initdata = INADDR_NONE; /* Gateway IP address */
67 u32 ic_netmask __initdata = INADDR_NONE; /* Netmask for local subnet */
68 int ic_enable __initdata = 1; /* Automatic IP configuration enabled */
69 int ic_host_name_set __initdata = 0; /* Host name configured manually */
70 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
71
72 u32 root_server_addr __initdata = INADDR_NONE; /* Address of boot server */
73 u8 root_server_path[256] __initdata = { 0, }; /* Path to mount as root */
74
75 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
76
77 #define CONFIG_IP_PNP_DYNAMIC
78
79 int ic_proto_enabled __initdata = 0 /* Protocols enabled */
80 #ifdef CONFIG_IP_PNP_BOOTP
81 | IC_BOOTP
82 #endif
83 #ifdef CONFIG_IP_PNP_RARP
84 | IC_RARP
85 #endif
86 ;
87 static int ic_got_reply __initdata = 0; /* Protocol(s) we got reply from */
88
89 #else
90
91 static int ic_proto_enabled __initdata = 0;
92
93 #endif
94
95 static int ic_proto_have_if __initdata = 0;
96
97 /*
98 * Network devices
99 */
100
101 struct ic_device {
102 struct ic_device *next;
103 struct net_device *dev;
104 unsigned short flags;
105 int able;
106 };
107
108 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
109 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
110
111 static int __init ic_open_devs(void)
112 {
113 struct ic_device *d, **last;
114 struct net_device *dev;
115 unsigned short oflags;
116
117 last = &ic_first_dev;
118 rtnl_shlock();
119 for (dev = dev_base; dev; dev = dev->next) {
120 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
121 (!(dev->flags & IFF_LOOPBACK) &&
122 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
123 strncmp(dev->name, "dummy", 5))) {
124 int able = 0;
125 if (dev->mtu >= 364)
126 able |= IC_BOOTP;
127 else
128 printk(KERN_WARNING "BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
129 if (!(dev->flags & IFF_NOARP))
130 able |= IC_RARP;
131 able &= ic_proto_enabled;
132 if (ic_proto_enabled && !able)
133 continue;
134 oflags = dev->flags;
135 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
136 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
137 continue;
138 }
139 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL)))
140 return -1;
141 d->dev = dev;
142 *last = d;
143 last = &d->next;
144 d->flags = oflags;
145 d->able = able;
146 ic_proto_have_if |= able;
147 DBG(("IP-Config: Opened %s (able=%d)\n", dev->name, able));
148 }
149 }
150 rtnl_shunlock();
151
152 *last = NULL;
153
154 if (!ic_first_dev) {
155 if (user_dev_name[0])
156 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
157 else
158 printk(KERN_ERR "IP-Config: No network devices available.\n");
159 return -1;
160 }
161 return 0;
162 }
163
164 static void __init ic_close_devs(void)
165 {
166 struct ic_device *d, *next;
167 struct net_device *dev;
168
169 rtnl_shlock();
170 next = ic_first_dev;
171 while ((d = next)) {
172 next = d->next;
173 dev = d->dev;
174 if (dev != ic_dev) {
175 DBG(("IP-Config: Downing %s\n", dev->name));
176 dev_change_flags(dev, d->flags);
177 }
178 kfree(d);
179 }
180 rtnl_shunlock();
181 }
182
183 /*
184 * Interface to various network functions.
185 */
186
187 static inline void
188 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port)
189 {
190 sin->sin_family = AF_INET;
191 sin->sin_addr.s_addr = addr;
192 sin->sin_port = port;
193 }
194
195 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
196 {
197 int res;
198
199 mm_segment_t oldfs = get_fs();
200 set_fs(get_ds());
201 res = devinet_ioctl(cmd, arg);
202 set_fs(oldfs);
203 return res;
204 }
205
206 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
207 {
208 int res;
209
210 mm_segment_t oldfs = get_fs();
211 set_fs(get_ds());
212 res = ip_rt_ioctl(cmd, arg);
213 set_fs(oldfs);
214 return res;
215 }
216
217 /*
218 * Set up interface addresses and routes.
219 */
220
221 static int __init ic_setup_if(void)
222 {
223 struct ifreq ir;
224 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
225 int err;
226
227 memset(&ir, 0, sizeof(ir));
228 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
229 set_sockaddr(sin, ic_myaddr, 0);
230 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
231 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
232 return -1;
233 }
234 set_sockaddr(sin, ic_netmask, 0);
235 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
236 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
237 return -1;
238 }
239 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
240 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
241 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
242 return -1;
243 }
244 return 0;
245 }
246
247 static int __init ic_setup_routes(void)
248 {
249 /* No need to setup device routes, only the default route... */
250
251 if (ic_gateway != INADDR_NONE) {
252 struct rtentry rm;
253 int err;
254
255 memset(&rm, 0, sizeof(rm));
256 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
257 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
258 return -1;
259 }
260 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
261 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
262 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
263 rm.rt_flags = RTF_UP | RTF_GATEWAY;
264 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
265 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
266 return -1;
267 }
268 }
269
270 return 0;
271 }
272
273 /*
274 * Fill in default values for all missing parameters.
275 */
276
277 static int __init ic_defaults(void)
278 {
279 /*
280 * At this point we have no userspace running so need not
281 * claim locks on system_utsname
282 */
283
284 if (!ic_host_name_set)
285 strcpy(system_utsname.nodename, in_ntoa(ic_myaddr));
286
287 if (root_server_addr == INADDR_NONE)
288 root_server_addr = ic_servaddr;
289
290 if (ic_netmask == INADDR_NONE) {
291 if (IN_CLASSA(ntohl(ic_myaddr)))
292 ic_netmask = htonl(IN_CLASSA_NET);
293 else if (IN_CLASSB(ntohl(ic_myaddr)))
294 ic_netmask = htonl(IN_CLASSB_NET);
295 else if (IN_CLASSC(ntohl(ic_myaddr)))
296 ic_netmask = htonl(IN_CLASSC_NET);
297 else {
298 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
299 NIPQUAD(ic_myaddr));
300 return -1;
301 }
302 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
303 }
304
305 return 0;
306 }
307
308 /*
309 * RARP support.
310 */
311
312 #ifdef CONFIG_IP_PNP_RARP
313
314 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
315
316 static struct packet_type rarp_packet_type __initdata = {
317 __constant_htons(ETH_P_RARP),
318 NULL, /* Listen to all devices */
319 ic_rarp_recv,
320 NULL,
321 NULL
322 };
323
324 static inline void ic_rarp_init(void)
325 {
326 dev_add_pack(&rarp_packet_type);
327 }
328
329 static inline void ic_rarp_cleanup(void)
330 {
331 dev_remove_pack(&rarp_packet_type);
332 }
333
334 /*
335 * Process received RARP packet.
336 */
337 static int __init
338 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
339 {
340 struct arphdr *rarp = (struct arphdr *)skb->h.raw;
341 unsigned char *rarp_ptr = (unsigned char *) (rarp + 1);
342 unsigned long sip, tip;
343 unsigned char *sha, *tha; /* s for "source", t for "target" */
344
345 /* If we already have a reply, just drop the packet */
346 if (ic_got_reply)
347 goto drop;
348
349 /* If this test doesn't pass, it's not IP, or we should ignore it anyway */
350 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
351 goto drop;
352
353 /* If it's not a RARP reply, delete it. */
354 if (rarp->ar_op != htons(ARPOP_RREPLY))
355 goto drop;
356
357 /* If it's not Ethernet, delete it. */
358 if (rarp->ar_pro != htons(ETH_P_IP))
359 goto drop;
360
361 /* Extract variable-width fields */
362 sha = rarp_ptr;
363 rarp_ptr += dev->addr_len;
364 memcpy(&sip, rarp_ptr, 4);
365 rarp_ptr += 4;
366 tha = rarp_ptr;
367 rarp_ptr += dev->addr_len;
368 memcpy(&tip, rarp_ptr, 4);
369
370 /* Discard packets which are not meant for us. */
371 if (memcmp(tha, dev->dev_addr, dev->addr_len))
372 goto drop;
373
374 /* Discard packets which are not from specified server. */
375 if (ic_servaddr != INADDR_NONE && ic_servaddr != sip)
376 goto drop;
377
378 /* Victory! The packet is what we were looking for! */
379 if (!ic_got_reply) {
380 ic_got_reply = IC_RARP;
381 ic_dev = dev;
382 if (ic_myaddr == INADDR_NONE)
383 ic_myaddr = tip;
384 ic_servaddr = sip;
385 }
386
387 /* And throw the packet out... */
388 drop:
389 kfree_skb(skb);
390 return 0;
391 }
392
393
394 /*
395 * Send RARP request packet over all devices which allow RARP.
396 */
397 static void __init ic_rarp_send(void)
398 {
399 struct ic_device *d;
400
401 for (d=ic_first_dev; d; d=d->next)
402 if (d->able & IC_RARP) {
403 struct net_device *dev = d->dev;
404 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
405 dev->dev_addr, dev->dev_addr);
406 }
407 }
408
409 #endif
410
411 /*
412 * BOOTP support.
413 */
414
415 #ifdef CONFIG_IP_PNP_BOOTP
416
417 struct bootp_pkt { /* BOOTP packet format */
418 struct iphdr iph; /* IP header */
419 struct udphdr udph; /* UDP header */
420 u8 op; /* 1=request, 2=reply */
421 u8 htype; /* HW address type */
422 u8 hlen; /* HW address length */
423 u8 hops; /* Used only by gateways */
424 u32 xid; /* Transaction ID */
425 u16 secs; /* Seconds since we started */
426 u16 flags; /* Just what it says */
427 u32 client_ip; /* Client's IP address if known */
428 u32 your_ip; /* Assigned IP address */
429 u32 server_ip; /* Server's IP address */
430 u32 relay_ip; /* IP address of BOOTP relay */
431 u8 hw_addr[16]; /* Client's HW address */
432 u8 serv_name[64]; /* Server host name */
433 u8 boot_file[128]; /* Name of boot file */
434 u8 vendor_area[128]; /* Area for extensions */
435 };
436
437 #define BOOTP_REQUEST 1
438 #define BOOTP_REPLY 2
439
440 static u32 ic_bootp_xid;
441
442 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
443
444 static struct packet_type bootp_packet_type __initdata = {
445 __constant_htons(ETH_P_IP),
446 NULL, /* Listen to all devices */
447 ic_bootp_recv,
448 NULL,
449 NULL
450 };
451
452
453 /*
454 * Initialize BOOTP extension fields in the request.
455 */
456 static void __init ic_bootp_init_ext(u8 *e)
457 {
458 *e++ = 99; /* RFC1048 Magic Cookie */
459 *e++ = 130;
460 *e++ = 83;
461 *e++ = 99;
462 *e++ = 1; /* Subnet mask request */
463 *e++ = 4;
464 e += 4;
465 *e++ = 3; /* Default gateway request */
466 *e++ = 4;
467 e += 4;
468 *e++ = 12; /* Host name request */
469 *e++ = 32;
470 e += 32;
471 *e++ = 40; /* NIS Domain name request */
472 *e++ = 32;
473 e += 32;
474 *e++ = 17; /* Boot path */
475 *e++ = 32;
476 e += 32;
477 *e = 255; /* End of the list */
478 }
479
480
481 /*
482 * Initialize the BOOTP mechanism.
483 */
484 static inline void ic_bootp_init(void)
485 {
486 get_random_bytes(&ic_bootp_xid, sizeof(u32));
487 DBG(("BOOTP: XID=%08x\n", ic_bootp_xid));
488 dev_add_pack(&bootp_packet_type);
489 }
490
491
492 /*
493 * BOOTP cleanup.
494 */
495 static inline void ic_bootp_cleanup(void)
496 {
497 dev_remove_pack(&bootp_packet_type);
498 }
499
500
501 /*
502 * Send BOOTP request to single interface.
503 */
504 static void __init ic_bootp_send_if(struct ic_device *d, u32 jiffies)
505 {
506 struct net_device *dev = d->dev;
507 struct sk_buff *skb;
508 struct bootp_pkt *b;
509 int hh_len = (dev->hard_header_len + 15) & ~15;
510 struct iphdr *h;
511
512 /* Allocate packet */
513 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
514 if (!skb)
515 return;
516 skb_reserve(skb, hh_len);
517 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
518 memset(b, 0, sizeof(struct bootp_pkt));
519
520 /* Construct IP header */
521 skb->nh.iph = h = &b->iph;
522 h->version = 4;
523 h->ihl = 5;
524 h->tot_len = htons(sizeof(struct bootp_pkt));
525 h->frag_off = htons(IP_DF);
526 h->ttl = 64;
527 h->protocol = IPPROTO_UDP;
528 h->daddr = INADDR_BROADCAST;
529 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
530
531 /* Construct UDP header */
532 b->udph.source = htons(68);
533 b->udph.dest = htons(67);
534 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
535 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
536
537 /* Construct BOOTP header */
538 b->op = BOOTP_REQUEST;
539 if (dev->type < 256) /* check for false types */
540 b->htype = dev->type;
541 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
542 b->htype = ARPHRD_IEEE802;
543 else {
544 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
545 b->htype = dev->type; /* can cause undefined behavior */
546 }
547 b->hlen = dev->addr_len;
548 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
549 b->secs = htons(jiffies / HZ);
550 b->xid = ic_bootp_xid;
551 ic_bootp_init_ext(b->vendor_area);
552
553 /* Chain packet down the line... */
554 skb->dev = dev;
555 skb->protocol = __constant_htons(ETH_P_IP);
556 if ((dev->hard_header &&
557 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
558 dev_queue_xmit(skb) < 0)
559 printk("E");
560 }
561
562
563 /*
564 * Send BOOTP requests to all interfaces.
565 */
566 static void __init ic_bootp_send(u32 jiffies)
567 {
568 struct ic_device *d;
569
570 for(d=ic_first_dev; d; d=d->next)
571 if (d->able & IC_BOOTP)
572 ic_bootp_send_if(d, jiffies);
573 }
574
575
576 /*
577 * Copy BOOTP-supplied string if not already set.
578 */
579 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
580 {
581 if (!len)
582 return 0;
583 if (len > max-1)
584 len = max-1;
585 strncpy(dest, src, len);
586 dest[len] = '\0';
587 return 1;
588 }
589
590
591 /*
592 * Process BOOTP extension.
593 */
594 static void __init ic_do_bootp_ext(u8 *ext)
595 {
596 #ifdef IPCONFIG_DEBUG
597 u8 *c;
598
599 printk("BOOTP: Got extension %02x",*ext);
600 for(c=ext+2; c<ext+2+ext[1]; c++)
601 printk(" %02x", *c);
602 printk("\n");
603 #endif
604
605 switch (*ext++) {
606 case 1: /* Subnet mask */
607 if (ic_netmask == INADDR_NONE)
608 memcpy(&ic_netmask, ext+1, 4);
609 break;
610 case 3: /* Default gateway */
611 if (ic_gateway == INADDR_NONE)
612 memcpy(&ic_gateway, ext+1, 4);
613 break;
614 case 12: /* Host name */
615 ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
616 ic_host_name_set = 1;
617 break;
618 case 40: /* NIS Domain name */
619 ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
620 break;
621 case 17: /* Root path */
622 if (!root_server_path[0])
623 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
624 break;
625 }
626 }
627
628
629 /*
630 * Receive BOOTP reply.
631 */
632 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
633 {
634 struct bootp_pkt *b = (struct bootp_pkt *) skb->nh.iph;
635 struct iphdr *h = &b->iph;
636 int len;
637
638 /* If we already have a reply, just drop the packet */
639 if (ic_got_reply)
640 goto drop;
641
642 /* Check whether it's a BOOTP packet */
643 if (skb->pkt_type == PACKET_OTHERHOST ||
644 skb->len < sizeof(struct udphdr) + sizeof(struct iphdr) ||
645 h->ihl != 5 ||
646 h->version != 4 ||
647 ip_fast_csum((char *) h, h->ihl) != 0 ||
648 skb->len < ntohs(h->tot_len) ||
649 h->protocol != IPPROTO_UDP ||
650 b->udph.source != htons(67) ||
651 b->udph.dest != htons(68) ||
652 ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
653 goto drop;
654
655 /* Fragments are not supported */
656 if (h->frag_off & htons(IP_OFFSET|IP_MF)) {
657 printk(KERN_ERR "BOOTP: Ignoring fragmented reply.\n");
658 goto drop;
659 }
660
661 /* Is it a reply to our BOOTP request? */
662 len = ntohs(b->udph.len) - sizeof(struct udphdr);
663 if (len < 300 || /* See RFC 951:2.1 */
664 b->op != BOOTP_REPLY ||
665 b->xid != ic_bootp_xid) {
666 printk("?");
667 goto drop;
668 }
669
670 /* Extract basic fields */
671 ic_myaddr = b->your_ip;
672 ic_servaddr = b->server_ip;
673 ic_got_reply = IC_BOOTP;
674 ic_dev = dev;
675
676 /* Parse extensions */
677 if (b->vendor_area[0] == 99 && /* Check magic cookie */
678 b->vendor_area[1] == 130 &&
679 b->vendor_area[2] == 83 &&
680 b->vendor_area[3] == 99) {
681 u8 *ext = &b->vendor_area[4];
682 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
683 while (ext < end && *ext != 0xff) {
684 if (*ext == 0) /* Padding */
685 ext++;
686 else {
687 u8 *opt = ext;
688 ext += ext[1] + 2;
689 if (ext <= end)
690 ic_do_bootp_ext(opt);
691 }
692 }
693 }
694
695 if (ic_gateway == INADDR_NONE && b->relay_ip)
696 ic_gateway = b->relay_ip;
697
698 drop:
699 kfree_skb(skb);
700 return 0;
701 }
702
703
704 #endif
705
706
707 /*
708 * Dynamic IP configuration -- BOOTP and RARP.
709 */
710
711 #ifdef CONFIG_IP_PNP_DYNAMIC
712
713 static int __init ic_dynamic(void)
714 {
715 int retries;
716 unsigned long timeout, jiff;
717 unsigned long start_jiffies;
718 int do_rarp = ic_proto_have_if & IC_RARP;
719 int do_bootp = ic_proto_have_if & IC_BOOTP;
720
721 /*
722 * If neither BOOTP nor RARP was selected, return with an error. This
723 * routine gets only called when some pieces of information are mis-
724 * sing, and without BOOTP and RARP we are not able to get that in-
725 * formation.
726 */
727 if (!ic_proto_enabled) {
728 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
729 return -1;
730 }
731
732 #ifdef CONFIG_IP_PNP_BOOTP
733 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
734 printk(KERN_ERR "BOOTP: No suitable device found.\n");
735 #endif
736
737 #ifdef CONFIG_IP_PNP_RARP
738 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
739 printk(KERN_ERR "RARP: No suitable device found.\n");
740 #endif
741
742 if (!ic_proto_have_if)
743 /* Error message already printed */
744 return -1;
745
746 /*
747 * Setup RARP and BOOTP protocols
748 */
749 #ifdef CONFIG_IP_PNP_RARP
750 if (do_rarp)
751 ic_rarp_init();
752 #endif
753 #ifdef CONFIG_IP_PNP_BOOTP
754 if (do_bootp)
755 ic_bootp_init();
756 #endif
757
758 /*
759 * Send requests and wait, until we get an answer. This loop
760 * seems to be a terrible waste of CPU time, but actually there is
761 * only one process running at all, so we don't need to use any
762 * scheduler functions.
763 * [Actually we could now, but the nothing else running note still
764 * applies.. - AC]
765 */
766 printk(KERN_NOTICE "Sending %s%s%s requests...",
767 do_bootp ? "BOOTP" : "",
768 do_bootp && do_rarp ? " and " : "",
769 do_rarp ? "RARP" : "");
770 start_jiffies = jiffies;
771 retries = CONF_RETRIES;
772 get_random_bytes(&timeout, sizeof(timeout));
773 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
774 for(;;) {
775 #ifdef CONFIG_IP_PNP_BOOTP
776 if (do_bootp)
777 ic_bootp_send(jiffies - start_jiffies);
778 #endif
779 #ifdef CONFIG_IP_PNP_RARP
780 if (do_rarp)
781 ic_rarp_send();
782 #endif
783 printk(".");
784 jiff = jiffies + timeout;
785 while (jiffies < jiff && !ic_got_reply)
786 barrier();
787 if (ic_got_reply) {
788 printk(" OK\n");
789 break;
790 }
791 if (! --retries) {
792 printk(" timed out!\n");
793 break;
794 }
795 timeout = timeout CONF_TIMEOUT_MULT;
796 if (timeout > CONF_TIMEOUT_MAX)
797 timeout = CONF_TIMEOUT_MAX;
798 }
799
800 #ifdef CONFIG_IP_PNP_RARP
801 if (do_rarp)
802 ic_rarp_cleanup();
803 #endif
804 #ifdef CONFIG_IP_PNP_BOOTP
805 if (do_bootp)
806 ic_bootp_cleanup();
807 #endif
808
809 if (!ic_got_reply)
810 return -1;
811
812 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
813 (ic_got_reply & IC_BOOTP) ? "BOOTP" : "RARP",
814 NIPQUAD(ic_servaddr));
815 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
816
817 return 0;
818 }
819
820 #endif
821
822 /*
823 * IP Autoconfig dispatcher.
824 */
825
826 static int __init ip_auto_config(void)
827 {
828 if (!ic_enable)
829 return 0;
830
831 DBG(("IP-Config: Entered.\n"));
832
833 /* Setup all network devices */
834 if (ic_open_devs() < 0)
835 return -1;
836
837 /*
838 * If the config information is insufficient (e.g., our IP address or
839 * IP address of the boot server is missing or we have multiple network
840 * interfaces and no default was set), use BOOTP or RARP to get the
841 * missing values.
842 */
843 if (ic_myaddr == INADDR_NONE ||
844 #ifdef CONFIG_ROOT_NFS
845 (root_server_addr == INADDR_NONE && ic_servaddr == INADDR_NONE) ||
846 #endif
847 ic_first_dev->next) {
848 #ifdef CONFIG_IP_PNP_DYNAMIC
849 if (ic_dynamic() < 0) {
850 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
851 ic_close_devs();
852 return -1;
853 }
854 #else
855 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
856 ic_close_devs();
857 return -1;
858 #endif
859 } else {
860 ic_dev = ic_first_dev->dev; /* Device selected manually or only one device -> use it */
861 }
862
863 /*
864 * Use defaults whereever applicable.
865 */
866 if (ic_defaults() < 0)
867 return -1;
868
869 /*
870 * Close all network devices except the device we've
871 * autoconfigured and set up routes.
872 */
873 ic_close_devs();
874 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
875 return -1;
876
877 DBG(("IP-Config: device=%s, local=%08x, server=%08x, boot=%08x, gw=%08x, mask=%08x\n",
878 ic_dev->name, ic_myaddr, ic_servaddr, root_server_addr, ic_gateway, ic_netmask));
879 DBG(("IP-Config: host=%s, domain=%s, path=`%s'\n", system_utsname.nodename,
880 system_utsname.domainname, root_server_path));
881 return 0;
882 }
883
884 module_init(ip_auto_config);
885
886
887 /*
888 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
889 * command line parameter. It consists of option fields separated by colons in
890 * the following order:
891 *
892 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<bootp|rarp>
893 *
894 * Any of the fields can be empty which means to use a default value:
895 * <client-ip> - address given by BOOTP or RARP
896 * <server-ip> - address of host returning BOOTP or RARP packet
897 * <gw-ip> - none, or the address returned by BOOTP
898 * <netmask> - automatically determined from <client-ip>, or the
899 * one returned by BOOTP
900 * <host name> - <client-ip> in ASCII notation, or the name returned
901 * by BOOTP
902 * <device> - use all available devices
903 * <bootp|rarp|both|off> - use both protocols to determine my own address
904 */
905 static int __init ic_proto_name(char *name)
906 {
907 if (!strcmp(name, "off")) {
908 ic_proto_enabled = 0;
909 return 1;
910 }
911 #ifdef CONFIG_IP_PNP_BOOTP
912 else if (!strcmp(name, "bootp")) {
913 ic_proto_enabled &= ~IC_RARP;
914 return 1;
915 }
916 #endif
917 #ifdef CONFIG_IP_PNP_RARP
918 else if (!strcmp(name, "rarp")) {
919 ic_proto_enabled &= ~IC_BOOTP;
920 return 1;
921 }
922 #endif
923 #ifdef CONFIG_IP_PNP_DYNAMIC
924 else if (!strcmp(name, "both")) {
925 return 1;
926 }
927 #endif
928 return 0;
929 }
930
931 static int __init ip_auto_config_setup(char *addrs)
932 {
933 char *cp, *ip, *dp;
934 int num = 0;
935
936 ic_set_manually = 1;
937 if (!strcmp(addrs, "off")) {
938 ic_enable = 0;
939 return 1;
940 }
941 if (ic_proto_name(addrs))
942 return 1;
943
944 /* Parse the whole string */
945 ip = addrs;
946 while (ip && *ip) {
947 if ((cp = strchr(ip, ':')))
948 *cp++ = '\0';
949 if (strlen(ip) > 0) {
950 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
951 switch (num) {
952 case 0:
953 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
954 ic_myaddr = INADDR_NONE;
955 break;
956 case 1:
957 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
958 ic_servaddr = INADDR_NONE;
959 break;
960 case 2:
961 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
962 ic_gateway = INADDR_NONE;
963 break;
964 case 3:
965 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
966 ic_netmask = INADDR_NONE;
967 break;
968 case 4:
969 if ((dp = strchr(ip, '.'))) {
970 *dp++ = '\0';
971 strncpy(system_utsname.domainname, dp, __NEW_UTS_LEN);
972 system_utsname.domainname[__NEW_UTS_LEN] = '\0';
973 }
974 strncpy(system_utsname.nodename, ip, __NEW_UTS_LEN);
975 system_utsname.nodename[__NEW_UTS_LEN] = '\0';
976 ic_host_name_set = 1;
977 break;
978 case 5:
979 strncpy(user_dev_name, ip, IFNAMSIZ);
980 user_dev_name[IFNAMSIZ-1] = '\0';
981 break;
982 case 6:
983 ic_proto_name(ip);
984 break;
985 }
986 }
987 ip = cp;
988 num++;
989 }
990
991 return 1;
992 }
993
994 static int __init nfsaddrs_config_setup(char *addrs)
995 {
996 return ip_auto_config_setup(addrs);
997 }
998
999 __setup("ip=", ip_auto_config_setup);
1000 __setup("nfsaddrs=", nfsaddrs_config_setup);
1001
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