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net: Convert net_ratelimit uses to net_<level>_ratelimited
[deliverable/linux.git] / net / ipv4 / ipconfig.c
1 /*
2 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
3 * user-supplied information to configure own IP address and routes.
4 *
5 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
6 *
7 * Derived from network configuration code in fs/nfs/nfsroot.c,
8 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
9 *
10 * BOOTP rewritten to construct and analyse packets itself instead
11 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
12 * -- MJ, December 1998
13 *
14 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
15 * initialization scheme.
16 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
17 *
18 * DHCP support added. To users this looks like a whole separate
19 * protocol, but we know it's just a bag on the side of BOOTP.
20 * -- Chip Salzenberg <chip@valinux.com>, May 2000
21 *
22 * Ported DHCP support from 2.2.16 to 2.4.0-test4
23 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
24 *
25 * Merged changes from 2.2.19 into 2.4.3
26 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
27 *
28 * Multiple Nameservers in /proc/net/pnp
29 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
30 */
31
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/kernel.h>
35 #include <linux/jiffies.h>
36 #include <linux/random.h>
37 #include <linux/init.h>
38 #include <linux/utsname.h>
39 #include <linux/in.h>
40 #include <linux/if.h>
41 #include <linux/inet.h>
42 #include <linux/inetdevice.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/ip.h>
47 #include <linux/socket.h>
48 #include <linux/route.h>
49 #include <linux/udp.h>
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <linux/major.h>
53 #include <linux/root_dev.h>
54 #include <linux/delay.h>
55 #include <linux/nfs_fs.h>
56 #include <linux/slab.h>
57 #include <linux/export.h>
58 #include <net/net_namespace.h>
59 #include <net/arp.h>
60 #include <net/ip.h>
61 #include <net/ipconfig.h>
62 #include <net/route.h>
63
64 #include <asm/uaccess.h>
65 #include <net/checksum.h>
66 #include <asm/processor.h>
67
68 /* Define this to allow debugging output */
69 #undef IPCONFIG_DEBUG
70
71 #ifdef IPCONFIG_DEBUG
72 #define DBG(x) printk x
73 #else
74 #define DBG(x) do { } while(0)
75 #endif
76
77 #if defined(CONFIG_IP_PNP_DHCP)
78 #define IPCONFIG_DHCP
79 #endif
80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
81 #define IPCONFIG_BOOTP
82 #endif
83 #if defined(CONFIG_IP_PNP_RARP)
84 #define IPCONFIG_RARP
85 #endif
86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
87 #define IPCONFIG_DYNAMIC
88 #endif
89
90 /* Define the friendly delay before and after opening net devices */
91 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
92 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
93
94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
95 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
96 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
97 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
98 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
99 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
103 - '3' from resolv.h */
104
105 #define NONE cpu_to_be32(INADDR_NONE)
106 #define ANY cpu_to_be32(INADDR_ANY)
107
108 /*
109 * Public IP configuration
110 */
111
112 /* This is used by platforms which might be able to set the ipconfig
113 * variables using firmware environment vars. If this is set, it will
114 * ignore such firmware variables.
115 */
116 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
117
118 static int ic_enable __initdata = 0; /* IP config enabled? */
119
120 /* Protocol choice */
121 int ic_proto_enabled __initdata = 0
122 #ifdef IPCONFIG_BOOTP
123 | IC_BOOTP
124 #endif
125 #ifdef CONFIG_IP_PNP_DHCP
126 | IC_USE_DHCP
127 #endif
128 #ifdef IPCONFIG_RARP
129 | IC_RARP
130 #endif
131 ;
132
133 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
134
135 __be32 ic_myaddr = NONE; /* My IP address */
136 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
137 __be32 ic_gateway = NONE; /* Gateway IP address */
138
139 __be32 ic_servaddr = NONE; /* Boot server IP address */
140
141 __be32 root_server_addr = NONE; /* Address of NFS server */
142 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
143
144 __be32 ic_dev_xid; /* Device under configuration */
145
146 /* vendor class identifier */
147 static char vendor_class_identifier[253] __initdata;
148
149 /* Persistent data: */
150
151 static int ic_proto_used; /* Protocol used, if any */
152 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
153 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
154
155 /*
156 * Private state.
157 */
158
159 /* Name of user-selected boot device */
160 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
161
162 /* Protocols supported by available interfaces */
163 static int ic_proto_have_if __initdata = 0;
164
165 /* MTU for boot device */
166 static int ic_dev_mtu __initdata = 0;
167
168 #ifdef IPCONFIG_DYNAMIC
169 static DEFINE_SPINLOCK(ic_recv_lock);
170 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
171 #endif
172 #ifdef IPCONFIG_DHCP
173 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
174 #endif
175
176
177 /*
178 * Network devices
179 */
180
181 struct ic_device {
182 struct ic_device *next;
183 struct net_device *dev;
184 unsigned short flags;
185 short able;
186 __be32 xid;
187 };
188
189 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
190 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
191
192 static bool __init ic_is_init_dev(struct net_device *dev)
193 {
194 if (dev->flags & IFF_LOOPBACK)
195 return false;
196 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
197 (!(dev->flags & IFF_LOOPBACK) &&
198 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
199 strncmp(dev->name, "dummy", 5));
200 }
201
202 static int __init ic_open_devs(void)
203 {
204 struct ic_device *d, **last;
205 struct net_device *dev;
206 unsigned short oflags;
207 unsigned long start;
208
209 last = &ic_first_dev;
210 rtnl_lock();
211
212 /* bring loopback device up first */
213 for_each_netdev(&init_net, dev) {
214 if (!(dev->flags & IFF_LOOPBACK))
215 continue;
216 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
217 pr_err("IP-Config: Failed to open %s\n", dev->name);
218 }
219
220 for_each_netdev(&init_net, dev) {
221 if (ic_is_init_dev(dev)) {
222 int able = 0;
223 if (dev->mtu >= 364)
224 able |= IC_BOOTP;
225 else
226 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
227 dev->name, dev->mtu);
228 if (!(dev->flags & IFF_NOARP))
229 able |= IC_RARP;
230 able &= ic_proto_enabled;
231 if (ic_proto_enabled && !able)
232 continue;
233 oflags = dev->flags;
234 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
235 pr_err("IP-Config: Failed to open %s\n",
236 dev->name);
237 continue;
238 }
239 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
240 rtnl_unlock();
241 return -ENOMEM;
242 }
243 d->dev = dev;
244 *last = d;
245 last = &d->next;
246 d->flags = oflags;
247 d->able = able;
248 if (able & IC_BOOTP)
249 get_random_bytes(&d->xid, sizeof(__be32));
250 else
251 d->xid = 0;
252 ic_proto_have_if |= able;
253 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
254 dev->name, able, d->xid));
255 }
256 }
257
258 /* no point in waiting if we could not bring up at least one device */
259 if (!ic_first_dev)
260 goto have_carrier;
261
262 /* wait for a carrier on at least one device */
263 start = jiffies;
264 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
265 for_each_netdev(&init_net, dev)
266 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
267 goto have_carrier;
268
269 msleep(1);
270 }
271 have_carrier:
272 rtnl_unlock();
273
274 *last = NULL;
275
276 if (!ic_first_dev) {
277 if (user_dev_name[0])
278 pr_err("IP-Config: Device `%s' not found\n",
279 user_dev_name);
280 else
281 pr_err("IP-Config: No network devices available\n");
282 return -ENODEV;
283 }
284 return 0;
285 }
286
287 static void __init ic_close_devs(void)
288 {
289 struct ic_device *d, *next;
290 struct net_device *dev;
291
292 rtnl_lock();
293 next = ic_first_dev;
294 while ((d = next)) {
295 next = d->next;
296 dev = d->dev;
297 if (dev != ic_dev) {
298 DBG(("IP-Config: Downing %s\n", dev->name));
299 dev_change_flags(dev, d->flags);
300 }
301 kfree(d);
302 }
303 rtnl_unlock();
304 }
305
306 /*
307 * Interface to various network functions.
308 */
309
310 static inline void
311 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
312 {
313 sin->sin_family = AF_INET;
314 sin->sin_addr.s_addr = addr;
315 sin->sin_port = port;
316 }
317
318 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
319 {
320 int res;
321
322 mm_segment_t oldfs = get_fs();
323 set_fs(get_ds());
324 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
325 set_fs(oldfs);
326 return res;
327 }
328
329 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
330 {
331 int res;
332
333 mm_segment_t oldfs = get_fs();
334 set_fs(get_ds());
335 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
336 set_fs(oldfs);
337 return res;
338 }
339
340 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
341 {
342 int res;
343
344 mm_segment_t oldfs = get_fs();
345 set_fs(get_ds());
346 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
347 set_fs(oldfs);
348 return res;
349 }
350
351 /*
352 * Set up interface addresses and routes.
353 */
354
355 static int __init ic_setup_if(void)
356 {
357 struct ifreq ir;
358 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
359 int err;
360
361 memset(&ir, 0, sizeof(ir));
362 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
363 set_sockaddr(sin, ic_myaddr, 0);
364 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
365 pr_err("IP-Config: Unable to set interface address (%d)\n",
366 err);
367 return -1;
368 }
369 set_sockaddr(sin, ic_netmask, 0);
370 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
371 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
372 err);
373 return -1;
374 }
375 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
376 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
377 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
378 err);
379 return -1;
380 }
381 /* Handle the case where we need non-standard MTU on the boot link (a network
382 * using jumbo frames, for instance). If we can't set the mtu, don't error
383 * out, we'll try to muddle along.
384 */
385 if (ic_dev_mtu != 0) {
386 strcpy(ir.ifr_name, ic_dev->name);
387 ir.ifr_mtu = ic_dev_mtu;
388 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
389 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
390 ic_dev_mtu, err);
391 }
392 return 0;
393 }
394
395 static int __init ic_setup_routes(void)
396 {
397 /* No need to setup device routes, only the default route... */
398
399 if (ic_gateway != NONE) {
400 struct rtentry rm;
401 int err;
402
403 memset(&rm, 0, sizeof(rm));
404 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
405 pr_err("IP-Config: Gateway not on directly connected network\n");
406 return -1;
407 }
408 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
409 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
410 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
411 rm.rt_flags = RTF_UP | RTF_GATEWAY;
412 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
413 pr_err("IP-Config: Cannot add default route (%d)\n",
414 err);
415 return -1;
416 }
417 }
418
419 return 0;
420 }
421
422 /*
423 * Fill in default values for all missing parameters.
424 */
425
426 static int __init ic_defaults(void)
427 {
428 /*
429 * At this point we have no userspace running so need not
430 * claim locks on system_utsname
431 */
432
433 if (!ic_host_name_set)
434 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
435
436 if (root_server_addr == NONE)
437 root_server_addr = ic_servaddr;
438
439 if (ic_netmask == NONE) {
440 if (IN_CLASSA(ntohl(ic_myaddr)))
441 ic_netmask = htonl(IN_CLASSA_NET);
442 else if (IN_CLASSB(ntohl(ic_myaddr)))
443 ic_netmask = htonl(IN_CLASSB_NET);
444 else if (IN_CLASSC(ntohl(ic_myaddr)))
445 ic_netmask = htonl(IN_CLASSC_NET);
446 else {
447 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
448 &ic_myaddr);
449 return -1;
450 }
451 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
452 }
453
454 return 0;
455 }
456
457 /*
458 * RARP support.
459 */
460
461 #ifdef IPCONFIG_RARP
462
463 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
464
465 static struct packet_type rarp_packet_type __initdata = {
466 .type = cpu_to_be16(ETH_P_RARP),
467 .func = ic_rarp_recv,
468 };
469
470 static inline void __init ic_rarp_init(void)
471 {
472 dev_add_pack(&rarp_packet_type);
473 }
474
475 static inline void __init ic_rarp_cleanup(void)
476 {
477 dev_remove_pack(&rarp_packet_type);
478 }
479
480 /*
481 * Process received RARP packet.
482 */
483 static int __init
484 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
485 {
486 struct arphdr *rarp;
487 unsigned char *rarp_ptr;
488 __be32 sip, tip;
489 unsigned char *sha, *tha; /* s for "source", t for "target" */
490 struct ic_device *d;
491
492 if (!net_eq(dev_net(dev), &init_net))
493 goto drop;
494
495 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
496 return NET_RX_DROP;
497
498 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
499 goto drop;
500
501 /* Basic sanity checks can be done without the lock. */
502 rarp = (struct arphdr *)skb_transport_header(skb);
503
504 /* If this test doesn't pass, it's not IP, or we should
505 * ignore it anyway.
506 */
507 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
508 goto drop;
509
510 /* If it's not a RARP reply, delete it. */
511 if (rarp->ar_op != htons(ARPOP_RREPLY))
512 goto drop;
513
514 /* If it's not Ethernet, delete it. */
515 if (rarp->ar_pro != htons(ETH_P_IP))
516 goto drop;
517
518 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
519 goto drop;
520
521 /* OK, it is all there and looks valid, process... */
522 rarp = (struct arphdr *)skb_transport_header(skb);
523 rarp_ptr = (unsigned char *) (rarp + 1);
524
525 /* One reply at a time, please. */
526 spin_lock(&ic_recv_lock);
527
528 /* If we already have a reply, just drop the packet */
529 if (ic_got_reply)
530 goto drop_unlock;
531
532 /* Find the ic_device that the packet arrived on */
533 d = ic_first_dev;
534 while (d && d->dev != dev)
535 d = d->next;
536 if (!d)
537 goto drop_unlock; /* should never happen */
538
539 /* Extract variable-width fields */
540 sha = rarp_ptr;
541 rarp_ptr += dev->addr_len;
542 memcpy(&sip, rarp_ptr, 4);
543 rarp_ptr += 4;
544 tha = rarp_ptr;
545 rarp_ptr += dev->addr_len;
546 memcpy(&tip, rarp_ptr, 4);
547
548 /* Discard packets which are not meant for us. */
549 if (memcmp(tha, dev->dev_addr, dev->addr_len))
550 goto drop_unlock;
551
552 /* Discard packets which are not from specified server. */
553 if (ic_servaddr != NONE && ic_servaddr != sip)
554 goto drop_unlock;
555
556 /* We have a winner! */
557 ic_dev = dev;
558 if (ic_myaddr == NONE)
559 ic_myaddr = tip;
560 ic_servaddr = sip;
561 ic_got_reply = IC_RARP;
562
563 drop_unlock:
564 /* Show's over. Nothing to see here. */
565 spin_unlock(&ic_recv_lock);
566
567 drop:
568 /* Throw the packet out. */
569 kfree_skb(skb);
570 return 0;
571 }
572
573
574 /*
575 * Send RARP request packet over a single interface.
576 */
577 static void __init ic_rarp_send_if(struct ic_device *d)
578 {
579 struct net_device *dev = d->dev;
580 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
581 dev->dev_addr, dev->dev_addr);
582 }
583 #endif
584
585 /*
586 * DHCP/BOOTP support.
587 */
588
589 #ifdef IPCONFIG_BOOTP
590
591 struct bootp_pkt { /* BOOTP packet format */
592 struct iphdr iph; /* IP header */
593 struct udphdr udph; /* UDP header */
594 u8 op; /* 1=request, 2=reply */
595 u8 htype; /* HW address type */
596 u8 hlen; /* HW address length */
597 u8 hops; /* Used only by gateways */
598 __be32 xid; /* Transaction ID */
599 __be16 secs; /* Seconds since we started */
600 __be16 flags; /* Just what it says */
601 __be32 client_ip; /* Client's IP address if known */
602 __be32 your_ip; /* Assigned IP address */
603 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
604 __be32 relay_ip; /* IP address of BOOTP relay */
605 u8 hw_addr[16]; /* Client's HW address */
606 u8 serv_name[64]; /* Server host name */
607 u8 boot_file[128]; /* Name of boot file */
608 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
609 };
610
611 /* packet ops */
612 #define BOOTP_REQUEST 1
613 #define BOOTP_REPLY 2
614
615 /* DHCP message types */
616 #define DHCPDISCOVER 1
617 #define DHCPOFFER 2
618 #define DHCPREQUEST 3
619 #define DHCPDECLINE 4
620 #define DHCPACK 5
621 #define DHCPNAK 6
622 #define DHCPRELEASE 7
623 #define DHCPINFORM 8
624
625 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
626
627 static struct packet_type bootp_packet_type __initdata = {
628 .type = cpu_to_be16(ETH_P_IP),
629 .func = ic_bootp_recv,
630 };
631
632
633 /*
634 * Initialize DHCP/BOOTP extension fields in the request.
635 */
636
637 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
638
639 #ifdef IPCONFIG_DHCP
640
641 static void __init
642 ic_dhcp_init_options(u8 *options)
643 {
644 u8 mt = ((ic_servaddr == NONE)
645 ? DHCPDISCOVER : DHCPREQUEST);
646 u8 *e = options;
647 int len;
648
649 #ifdef IPCONFIG_DEBUG
650 printk("DHCP: Sending message type %d\n", mt);
651 #endif
652
653 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
654 e += 4;
655
656 *e++ = 53; /* DHCP message type */
657 *e++ = 1;
658 *e++ = mt;
659
660 if (mt == DHCPREQUEST) {
661 *e++ = 54; /* Server ID (IP address) */
662 *e++ = 4;
663 memcpy(e, &ic_servaddr, 4);
664 e += 4;
665
666 *e++ = 50; /* Requested IP address */
667 *e++ = 4;
668 memcpy(e, &ic_myaddr, 4);
669 e += 4;
670 }
671
672 /* always? */
673 {
674 static const u8 ic_req_params[] = {
675 1, /* Subnet mask */
676 3, /* Default gateway */
677 6, /* DNS server */
678 12, /* Host name */
679 15, /* Domain name */
680 17, /* Boot path */
681 26, /* MTU */
682 40, /* NIS domain name */
683 };
684
685 *e++ = 55; /* Parameter request list */
686 *e++ = sizeof(ic_req_params);
687 memcpy(e, ic_req_params, sizeof(ic_req_params));
688 e += sizeof(ic_req_params);
689
690 if (ic_host_name_set) {
691 *e++ = 12; /* host-name */
692 len = strlen(utsname()->nodename);
693 *e++ = len;
694 memcpy(e, utsname()->nodename, len);
695 e += len;
696 }
697 if (*vendor_class_identifier) {
698 pr_info("DHCP: sending class identifier \"%s\"\n",
699 vendor_class_identifier);
700 *e++ = 60; /* Class-identifier */
701 len = strlen(vendor_class_identifier);
702 *e++ = len;
703 memcpy(e, vendor_class_identifier, len);
704 e += len;
705 }
706 }
707
708 *e++ = 255; /* End of the list */
709 }
710
711 #endif /* IPCONFIG_DHCP */
712
713 static void __init ic_bootp_init_ext(u8 *e)
714 {
715 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
716 e += 4;
717 *e++ = 1; /* Subnet mask request */
718 *e++ = 4;
719 e += 4;
720 *e++ = 3; /* Default gateway request */
721 *e++ = 4;
722 e += 4;
723 *e++ = 5; /* Name server request */
724 *e++ = 8;
725 e += 8;
726 *e++ = 12; /* Host name request */
727 *e++ = 32;
728 e += 32;
729 *e++ = 40; /* NIS Domain name request */
730 *e++ = 32;
731 e += 32;
732 *e++ = 17; /* Boot path */
733 *e++ = 40;
734 e += 40;
735
736 *e++ = 57; /* set extension buffer size for reply */
737 *e++ = 2;
738 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
739 *e++ = 150;
740
741 *e++ = 255; /* End of the list */
742 }
743
744
745 /*
746 * Initialize the DHCP/BOOTP mechanism.
747 */
748 static inline void __init ic_bootp_init(void)
749 {
750 int i;
751
752 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
753 ic_nameservers[i] = NONE;
754
755 dev_add_pack(&bootp_packet_type);
756 }
757
758
759 /*
760 * DHCP/BOOTP cleanup.
761 */
762 static inline void __init ic_bootp_cleanup(void)
763 {
764 dev_remove_pack(&bootp_packet_type);
765 }
766
767
768 /*
769 * Send DHCP/BOOTP request to single interface.
770 */
771 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
772 {
773 struct net_device *dev = d->dev;
774 struct sk_buff *skb;
775 struct bootp_pkt *b;
776 struct iphdr *h;
777 int hlen = LL_RESERVED_SPACE(dev);
778 int tlen = dev->needed_tailroom;
779
780 /* Allocate packet */
781 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
782 GFP_KERNEL);
783 if (!skb)
784 return;
785 skb_reserve(skb, hlen);
786 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
787 memset(b, 0, sizeof(struct bootp_pkt));
788
789 /* Construct IP header */
790 skb_reset_network_header(skb);
791 h = ip_hdr(skb);
792 h->version = 4;
793 h->ihl = 5;
794 h->tot_len = htons(sizeof(struct bootp_pkt));
795 h->frag_off = htons(IP_DF);
796 h->ttl = 64;
797 h->protocol = IPPROTO_UDP;
798 h->daddr = htonl(INADDR_BROADCAST);
799 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
800
801 /* Construct UDP header */
802 b->udph.source = htons(68);
803 b->udph.dest = htons(67);
804 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
805 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
806
807 /* Construct DHCP/BOOTP header */
808 b->op = BOOTP_REQUEST;
809 if (dev->type < 256) /* check for false types */
810 b->htype = dev->type;
811 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
812 b->htype = ARPHRD_IEEE802;
813 else if (dev->type == ARPHRD_FDDI)
814 b->htype = ARPHRD_ETHER;
815 else {
816 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
817 b->htype = dev->type; /* can cause undefined behavior */
818 }
819
820 /* server_ip and your_ip address are both already zero per RFC2131 */
821 b->hlen = dev->addr_len;
822 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
823 b->secs = htons(jiffies_diff / HZ);
824 b->xid = d->xid;
825
826 /* add DHCP options or BOOTP extensions */
827 #ifdef IPCONFIG_DHCP
828 if (ic_proto_enabled & IC_USE_DHCP)
829 ic_dhcp_init_options(b->exten);
830 else
831 #endif
832 ic_bootp_init_ext(b->exten);
833
834 /* Chain packet down the line... */
835 skb->dev = dev;
836 skb->protocol = htons(ETH_P_IP);
837 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
838 dev->broadcast, dev->dev_addr, skb->len) < 0) {
839 kfree_skb(skb);
840 printk("E");
841 return;
842 }
843
844 if (dev_queue_xmit(skb) < 0)
845 printk("E");
846 }
847
848
849 /*
850 * Copy BOOTP-supplied string if not already set.
851 */
852 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
853 {
854 if (!len)
855 return 0;
856 if (len > max-1)
857 len = max-1;
858 memcpy(dest, src, len);
859 dest[len] = '\0';
860 return 1;
861 }
862
863
864 /*
865 * Process BOOTP extensions.
866 */
867 static void __init ic_do_bootp_ext(u8 *ext)
868 {
869 u8 servers;
870 int i;
871 __be16 mtu;
872
873 #ifdef IPCONFIG_DEBUG
874 u8 *c;
875
876 printk("DHCP/BOOTP: Got extension %d:",*ext);
877 for (c=ext+2; c<ext+2+ext[1]; c++)
878 printk(" %02x", *c);
879 printk("\n");
880 #endif
881
882 switch (*ext++) {
883 case 1: /* Subnet mask */
884 if (ic_netmask == NONE)
885 memcpy(&ic_netmask, ext+1, 4);
886 break;
887 case 3: /* Default gateway */
888 if (ic_gateway == NONE)
889 memcpy(&ic_gateway, ext+1, 4);
890 break;
891 case 6: /* DNS server */
892 servers= *ext/4;
893 if (servers > CONF_NAMESERVERS_MAX)
894 servers = CONF_NAMESERVERS_MAX;
895 for (i = 0; i < servers; i++) {
896 if (ic_nameservers[i] == NONE)
897 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
898 }
899 break;
900 case 12: /* Host name */
901 ic_bootp_string(utsname()->nodename, ext+1, *ext,
902 __NEW_UTS_LEN);
903 ic_host_name_set = 1;
904 break;
905 case 15: /* Domain name (DNS) */
906 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
907 break;
908 case 17: /* Root path */
909 if (!root_server_path[0])
910 ic_bootp_string(root_server_path, ext+1, *ext,
911 sizeof(root_server_path));
912 break;
913 case 26: /* Interface MTU */
914 memcpy(&mtu, ext+1, sizeof(mtu));
915 ic_dev_mtu = ntohs(mtu);
916 break;
917 case 40: /* NIS Domain name (_not_ DNS) */
918 ic_bootp_string(utsname()->domainname, ext+1, *ext,
919 __NEW_UTS_LEN);
920 break;
921 }
922 }
923
924
925 /*
926 * Receive BOOTP reply.
927 */
928 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
929 {
930 struct bootp_pkt *b;
931 struct iphdr *h;
932 struct ic_device *d;
933 int len, ext_len;
934
935 if (!net_eq(dev_net(dev), &init_net))
936 goto drop;
937
938 /* Perform verifications before taking the lock. */
939 if (skb->pkt_type == PACKET_OTHERHOST)
940 goto drop;
941
942 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
943 return NET_RX_DROP;
944
945 if (!pskb_may_pull(skb,
946 sizeof(struct iphdr) +
947 sizeof(struct udphdr)))
948 goto drop;
949
950 b = (struct bootp_pkt *)skb_network_header(skb);
951 h = &b->iph;
952
953 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
954 goto drop;
955
956 /* Fragments are not supported */
957 if (ip_is_fragment(h)) {
958 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
959 goto drop;
960 }
961
962 if (skb->len < ntohs(h->tot_len))
963 goto drop;
964
965 if (ip_fast_csum((char *) h, h->ihl))
966 goto drop;
967
968 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
969 goto drop;
970
971 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
972 goto drop;
973
974 len = ntohs(b->udph.len) - sizeof(struct udphdr);
975 ext_len = len - (sizeof(*b) -
976 sizeof(struct iphdr) -
977 sizeof(struct udphdr) -
978 sizeof(b->exten));
979 if (ext_len < 0)
980 goto drop;
981
982 /* Ok the front looks good, make sure we can get at the rest. */
983 if (!pskb_may_pull(skb, skb->len))
984 goto drop;
985
986 b = (struct bootp_pkt *)skb_network_header(skb);
987 h = &b->iph;
988
989 /* One reply at a time, please. */
990 spin_lock(&ic_recv_lock);
991
992 /* If we already have a reply, just drop the packet */
993 if (ic_got_reply)
994 goto drop_unlock;
995
996 /* Find the ic_device that the packet arrived on */
997 d = ic_first_dev;
998 while (d && d->dev != dev)
999 d = d->next;
1000 if (!d)
1001 goto drop_unlock; /* should never happen */
1002
1003 /* Is it a reply to our BOOTP request? */
1004 if (b->op != BOOTP_REPLY ||
1005 b->xid != d->xid) {
1006 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1007 b->op, b->xid);
1008 goto drop_unlock;
1009 }
1010
1011 /* Is it a reply for the device we are configuring? */
1012 if (b->xid != ic_dev_xid) {
1013 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1014 goto drop_unlock;
1015 }
1016
1017 /* Parse extensions */
1018 if (ext_len >= 4 &&
1019 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1020 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1021 u8 *ext;
1022
1023 #ifdef IPCONFIG_DHCP
1024 if (ic_proto_enabled & IC_USE_DHCP) {
1025 __be32 server_id = NONE;
1026 int mt = 0;
1027
1028 ext = &b->exten[4];
1029 while (ext < end && *ext != 0xff) {
1030 u8 *opt = ext++;
1031 if (*opt == 0) /* Padding */
1032 continue;
1033 ext += *ext + 1;
1034 if (ext >= end)
1035 break;
1036 switch (*opt) {
1037 case 53: /* Message type */
1038 if (opt[1])
1039 mt = opt[2];
1040 break;
1041 case 54: /* Server ID (IP address) */
1042 if (opt[1] >= 4)
1043 memcpy(&server_id, opt + 2, 4);
1044 break;
1045 }
1046 }
1047
1048 #ifdef IPCONFIG_DEBUG
1049 printk("DHCP: Got message type %d\n", mt);
1050 #endif
1051
1052 switch (mt) {
1053 case DHCPOFFER:
1054 /* While in the process of accepting one offer,
1055 * ignore all others.
1056 */
1057 if (ic_myaddr != NONE)
1058 goto drop_unlock;
1059
1060 /* Let's accept that offer. */
1061 ic_myaddr = b->your_ip;
1062 ic_servaddr = server_id;
1063 #ifdef IPCONFIG_DEBUG
1064 printk("DHCP: Offered address %pI4 by server %pI4\n",
1065 &ic_myaddr, &ic_servaddr);
1066 #endif
1067 /* The DHCP indicated server address takes
1068 * precedence over the bootp header one if
1069 * they are different.
1070 */
1071 if ((server_id != NONE) &&
1072 (b->server_ip != server_id))
1073 b->server_ip = ic_servaddr;
1074 break;
1075
1076 case DHCPACK:
1077 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1078 goto drop_unlock;
1079
1080 /* Yeah! */
1081 break;
1082
1083 default:
1084 /* Urque. Forget it*/
1085 ic_myaddr = NONE;
1086 ic_servaddr = NONE;
1087 goto drop_unlock;
1088 }
1089
1090 ic_dhcp_msgtype = mt;
1091
1092 }
1093 #endif /* IPCONFIG_DHCP */
1094
1095 ext = &b->exten[4];
1096 while (ext < end && *ext != 0xff) {
1097 u8 *opt = ext++;
1098 if (*opt == 0) /* Padding */
1099 continue;
1100 ext += *ext + 1;
1101 if (ext < end)
1102 ic_do_bootp_ext(opt);
1103 }
1104 }
1105
1106 /* We have a winner! */
1107 ic_dev = dev;
1108 ic_myaddr = b->your_ip;
1109 ic_servaddr = b->server_ip;
1110 if (ic_gateway == NONE && b->relay_ip)
1111 ic_gateway = b->relay_ip;
1112 if (ic_nameservers[0] == NONE)
1113 ic_nameservers[0] = ic_servaddr;
1114 ic_got_reply = IC_BOOTP;
1115
1116 drop_unlock:
1117 /* Show's over. Nothing to see here. */
1118 spin_unlock(&ic_recv_lock);
1119
1120 drop:
1121 /* Throw the packet out. */
1122 kfree_skb(skb);
1123
1124 return 0;
1125 }
1126
1127
1128 #endif
1129
1130
1131 /*
1132 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1133 */
1134
1135 #ifdef IPCONFIG_DYNAMIC
1136
1137 static int __init ic_dynamic(void)
1138 {
1139 int retries;
1140 struct ic_device *d;
1141 unsigned long start_jiffies, timeout, jiff;
1142 int do_bootp = ic_proto_have_if & IC_BOOTP;
1143 int do_rarp = ic_proto_have_if & IC_RARP;
1144
1145 /*
1146 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1147 * This routine gets only called when some pieces of information
1148 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1149 */
1150 if (!ic_proto_enabled) {
1151 pr_err("IP-Config: Incomplete network configuration information\n");
1152 return -1;
1153 }
1154
1155 #ifdef IPCONFIG_BOOTP
1156 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1157 pr_err("DHCP/BOOTP: No suitable device found\n");
1158 #endif
1159 #ifdef IPCONFIG_RARP
1160 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1161 pr_err("RARP: No suitable device found\n");
1162 #endif
1163
1164 if (!ic_proto_have_if)
1165 /* Error message already printed */
1166 return -1;
1167
1168 /*
1169 * Setup protocols
1170 */
1171 #ifdef IPCONFIG_BOOTP
1172 if (do_bootp)
1173 ic_bootp_init();
1174 #endif
1175 #ifdef IPCONFIG_RARP
1176 if (do_rarp)
1177 ic_rarp_init();
1178 #endif
1179
1180 /*
1181 * Send requests and wait, until we get an answer. This loop
1182 * seems to be a terrible waste of CPU time, but actually there is
1183 * only one process running at all, so we don't need to use any
1184 * scheduler functions.
1185 * [Actually we could now, but the nothing else running note still
1186 * applies.. - AC]
1187 */
1188 pr_notice("Sending %s%s%s requests .",
1189 do_bootp
1190 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1191 (do_bootp && do_rarp) ? " and " : "",
1192 do_rarp ? "RARP" : "");
1193
1194 start_jiffies = jiffies;
1195 d = ic_first_dev;
1196 retries = CONF_SEND_RETRIES;
1197 get_random_bytes(&timeout, sizeof(timeout));
1198 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1199 for (;;) {
1200 /* Track the device we are configuring */
1201 ic_dev_xid = d->xid;
1202
1203 #ifdef IPCONFIG_BOOTP
1204 if (do_bootp && (d->able & IC_BOOTP))
1205 ic_bootp_send_if(d, jiffies - start_jiffies);
1206 #endif
1207 #ifdef IPCONFIG_RARP
1208 if (do_rarp && (d->able & IC_RARP))
1209 ic_rarp_send_if(d);
1210 #endif
1211
1212 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1213 while (time_before(jiffies, jiff) && !ic_got_reply)
1214 schedule_timeout_uninterruptible(1);
1215 #ifdef IPCONFIG_DHCP
1216 /* DHCP isn't done until we get a DHCPACK. */
1217 if ((ic_got_reply & IC_BOOTP) &&
1218 (ic_proto_enabled & IC_USE_DHCP) &&
1219 ic_dhcp_msgtype != DHCPACK) {
1220 ic_got_reply = 0;
1221 pr_cont(",");
1222 continue;
1223 }
1224 #endif /* IPCONFIG_DHCP */
1225
1226 if (ic_got_reply) {
1227 pr_cont(" OK\n");
1228 break;
1229 }
1230
1231 if ((d = d->next))
1232 continue;
1233
1234 if (! --retries) {
1235 pr_cont(" timed out!\n");
1236 break;
1237 }
1238
1239 d = ic_first_dev;
1240
1241 timeout = timeout CONF_TIMEOUT_MULT;
1242 if (timeout > CONF_TIMEOUT_MAX)
1243 timeout = CONF_TIMEOUT_MAX;
1244
1245 pr_cont(".");
1246 }
1247
1248 #ifdef IPCONFIG_BOOTP
1249 if (do_bootp)
1250 ic_bootp_cleanup();
1251 #endif
1252 #ifdef IPCONFIG_RARP
1253 if (do_rarp)
1254 ic_rarp_cleanup();
1255 #endif
1256
1257 if (!ic_got_reply) {
1258 ic_myaddr = NONE;
1259 return -1;
1260 }
1261
1262 printk("IP-Config: Got %s answer from %pI4, ",
1263 ((ic_got_reply & IC_RARP) ? "RARP"
1264 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1265 &ic_servaddr);
1266 pr_cont("my address is %pI4\n", &ic_myaddr);
1267
1268 return 0;
1269 }
1270
1271 #endif /* IPCONFIG_DYNAMIC */
1272
1273 #ifdef CONFIG_PROC_FS
1274
1275 static int pnp_seq_show(struct seq_file *seq, void *v)
1276 {
1277 int i;
1278
1279 if (ic_proto_used & IC_PROTO)
1280 seq_printf(seq, "#PROTO: %s\n",
1281 (ic_proto_used & IC_RARP) ? "RARP"
1282 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1283 else
1284 seq_puts(seq, "#MANUAL\n");
1285
1286 if (ic_domain[0])
1287 seq_printf(seq,
1288 "domain %s\n", ic_domain);
1289 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1290 if (ic_nameservers[i] != NONE)
1291 seq_printf(seq, "nameserver %pI4\n",
1292 &ic_nameservers[i]);
1293 }
1294 if (ic_servaddr != NONE)
1295 seq_printf(seq, "bootserver %pI4\n",
1296 &ic_servaddr);
1297 return 0;
1298 }
1299
1300 static int pnp_seq_open(struct inode *indoe, struct file *file)
1301 {
1302 return single_open(file, pnp_seq_show, NULL);
1303 }
1304
1305 static const struct file_operations pnp_seq_fops = {
1306 .owner = THIS_MODULE,
1307 .open = pnp_seq_open,
1308 .read = seq_read,
1309 .llseek = seq_lseek,
1310 .release = single_release,
1311 };
1312 #endif /* CONFIG_PROC_FS */
1313
1314 /*
1315 * Extract IP address from the parameter string if needed. Note that we
1316 * need to have root_server_addr set _before_ IPConfig gets called as it
1317 * can override it.
1318 */
1319 __be32 __init root_nfs_parse_addr(char *name)
1320 {
1321 __be32 addr;
1322 int octets = 0;
1323 char *cp, *cq;
1324
1325 cp = cq = name;
1326 while (octets < 4) {
1327 while (*cp >= '0' && *cp <= '9')
1328 cp++;
1329 if (cp == cq || cp - cq > 3)
1330 break;
1331 if (*cp == '.' || octets == 3)
1332 octets++;
1333 if (octets < 4)
1334 cp++;
1335 cq = cp;
1336 }
1337 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1338 if (*cp == ':')
1339 *cp++ = '\0';
1340 addr = in_aton(name);
1341 memmove(name, cp, strlen(cp) + 1);
1342 } else
1343 addr = NONE;
1344
1345 return addr;
1346 }
1347
1348 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1349
1350 static int __init wait_for_devices(void)
1351 {
1352 int i;
1353
1354 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1355 struct net_device *dev;
1356 int found = 0;
1357
1358 rtnl_lock();
1359 for_each_netdev(&init_net, dev) {
1360 if (ic_is_init_dev(dev)) {
1361 found = 1;
1362 break;
1363 }
1364 }
1365 rtnl_unlock();
1366 if (found)
1367 return 0;
1368 ssleep(1);
1369 }
1370 return -ENODEV;
1371 }
1372
1373 /*
1374 * IP Autoconfig dispatcher.
1375 */
1376
1377 static int __init ip_auto_config(void)
1378 {
1379 __be32 addr;
1380 #ifdef IPCONFIG_DYNAMIC
1381 int retries = CONF_OPEN_RETRIES;
1382 #endif
1383 int err;
1384
1385 #ifdef CONFIG_PROC_FS
1386 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1387 #endif /* CONFIG_PROC_FS */
1388
1389 if (!ic_enable)
1390 return 0;
1391
1392 DBG(("IP-Config: Entered.\n"));
1393 #ifdef IPCONFIG_DYNAMIC
1394 try_try_again:
1395 #endif
1396 /* Wait for devices to appear */
1397 err = wait_for_devices();
1398 if (err)
1399 return err;
1400
1401 /* Setup all network devices */
1402 err = ic_open_devs();
1403 if (err)
1404 return err;
1405
1406 /* Give drivers a chance to settle */
1407 msleep(CONF_POST_OPEN);
1408
1409 /*
1410 * If the config information is insufficient (e.g., our IP address or
1411 * IP address of the boot server is missing or we have multiple network
1412 * interfaces and no default was set), use BOOTP or RARP to get the
1413 * missing values.
1414 */
1415 if (ic_myaddr == NONE ||
1416 #ifdef CONFIG_ROOT_NFS
1417 (root_server_addr == NONE &&
1418 ic_servaddr == NONE &&
1419 ROOT_DEV == Root_NFS) ||
1420 #endif
1421 ic_first_dev->next) {
1422 #ifdef IPCONFIG_DYNAMIC
1423 if (ic_dynamic() < 0) {
1424 ic_close_devs();
1425
1426 /*
1427 * I don't know why, but sometimes the
1428 * eepro100 driver (at least) gets upset and
1429 * doesn't work the first time it's opened.
1430 * But then if you close it and reopen it, it
1431 * works just fine. So we need to try that at
1432 * least once before giving up.
1433 *
1434 * Also, if the root will be NFS-mounted, we
1435 * have nowhere to go if DHCP fails. So we
1436 * just have to keep trying forever.
1437 *
1438 * -- Chip
1439 */
1440 #ifdef CONFIG_ROOT_NFS
1441 if (ROOT_DEV == Root_NFS) {
1442 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1443 goto try_try_again;
1444 }
1445 #endif
1446
1447 if (--retries) {
1448 pr_err("IP-Config: Reopening network devices...\n");
1449 goto try_try_again;
1450 }
1451
1452 /* Oh, well. At least we tried. */
1453 pr_err("IP-Config: Auto-configuration of network failed\n");
1454 return -1;
1455 }
1456 #else /* !DYNAMIC */
1457 pr_err("IP-Config: Incomplete network configuration information\n");
1458 ic_close_devs();
1459 return -1;
1460 #endif /* IPCONFIG_DYNAMIC */
1461 } else {
1462 /* Device selected manually or only one device -> use it */
1463 ic_dev = ic_first_dev->dev;
1464 }
1465
1466 addr = root_nfs_parse_addr(root_server_path);
1467 if (root_server_addr == NONE)
1468 root_server_addr = addr;
1469
1470 /*
1471 * Use defaults wherever applicable.
1472 */
1473 if (ic_defaults() < 0)
1474 return -1;
1475
1476 /*
1477 * Close all network devices except the device we've
1478 * autoconfigured and set up routes.
1479 */
1480 ic_close_devs();
1481 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1482 return -1;
1483
1484 /*
1485 * Record which protocol was actually used.
1486 */
1487 #ifdef IPCONFIG_DYNAMIC
1488 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1489 #endif
1490
1491 #ifndef IPCONFIG_SILENT
1492 /*
1493 * Clue in the operator.
1494 */
1495 pr_info("IP-Config: Complete:\n");
1496 pr_info(" device=%s, addr=%pI4, mask=%pI4, gw=%pI4\n",
1497 ic_dev->name, &ic_myaddr, &ic_netmask, &ic_gateway);
1498 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1499 utsname()->nodename, ic_domain, utsname()->domainname);
1500 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1501 &ic_servaddr, &root_server_addr, root_server_path);
1502 if (ic_dev_mtu)
1503 pr_cont(", mtu=%d", ic_dev_mtu);
1504 pr_cont("\n");
1505 #endif /* !SILENT */
1506
1507 return 0;
1508 }
1509
1510 late_initcall(ip_auto_config);
1511
1512
1513 /*
1514 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1515 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1516 */
1517 static int __init ic_proto_name(char *name)
1518 {
1519 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1520 return 1;
1521 }
1522 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1523 return 0;
1524 }
1525 #ifdef CONFIG_IP_PNP_DHCP
1526 else if (!strcmp(name, "dhcp")) {
1527 ic_proto_enabled &= ~IC_RARP;
1528 return 1;
1529 }
1530 #endif
1531 #ifdef CONFIG_IP_PNP_BOOTP
1532 else if (!strcmp(name, "bootp")) {
1533 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1534 return 1;
1535 }
1536 #endif
1537 #ifdef CONFIG_IP_PNP_RARP
1538 else if (!strcmp(name, "rarp")) {
1539 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1540 return 1;
1541 }
1542 #endif
1543 #ifdef IPCONFIG_DYNAMIC
1544 else if (!strcmp(name, "both")) {
1545 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1546 return 1;
1547 }
1548 #endif
1549 return 0;
1550 }
1551
1552 static int __init ip_auto_config_setup(char *addrs)
1553 {
1554 char *cp, *ip, *dp;
1555 int num = 0;
1556
1557 ic_set_manually = 1;
1558 ic_enable = 1;
1559
1560 /*
1561 * If any dhcp, bootp etc options are set, leave autoconfig on
1562 * and skip the below static IP processing.
1563 */
1564 if (ic_proto_name(addrs))
1565 return 1;
1566
1567 /* If no static IP is given, turn off autoconfig and bail. */
1568 if (*addrs == 0 ||
1569 strcmp(addrs, "off") == 0 ||
1570 strcmp(addrs, "none") == 0) {
1571 ic_enable = 0;
1572 return 1;
1573 }
1574
1575 /* Parse string for static IP assignment. */
1576 ip = addrs;
1577 while (ip && *ip) {
1578 if ((cp = strchr(ip, ':')))
1579 *cp++ = '\0';
1580 if (strlen(ip) > 0) {
1581 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1582 switch (num) {
1583 case 0:
1584 if ((ic_myaddr = in_aton(ip)) == ANY)
1585 ic_myaddr = NONE;
1586 break;
1587 case 1:
1588 if ((ic_servaddr = in_aton(ip)) == ANY)
1589 ic_servaddr = NONE;
1590 break;
1591 case 2:
1592 if ((ic_gateway = in_aton(ip)) == ANY)
1593 ic_gateway = NONE;
1594 break;
1595 case 3:
1596 if ((ic_netmask = in_aton(ip)) == ANY)
1597 ic_netmask = NONE;
1598 break;
1599 case 4:
1600 if ((dp = strchr(ip, '.'))) {
1601 *dp++ = '\0';
1602 strlcpy(utsname()->domainname, dp,
1603 sizeof(utsname()->domainname));
1604 }
1605 strlcpy(utsname()->nodename, ip,
1606 sizeof(utsname()->nodename));
1607 ic_host_name_set = 1;
1608 break;
1609 case 5:
1610 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1611 break;
1612 case 6:
1613 if (ic_proto_name(ip) == 0 &&
1614 ic_myaddr == NONE) {
1615 ic_enable = 0;
1616 }
1617 break;
1618 }
1619 }
1620 ip = cp;
1621 num++;
1622 }
1623
1624 return 1;
1625 }
1626
1627 static int __init nfsaddrs_config_setup(char *addrs)
1628 {
1629 return ip_auto_config_setup(addrs);
1630 }
1631
1632 static int __init vendor_class_identifier_setup(char *addrs)
1633 {
1634 if (strlcpy(vendor_class_identifier, addrs,
1635 sizeof(vendor_class_identifier))
1636 >= sizeof(vendor_class_identifier))
1637 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1638 vendor_class_identifier);
1639 return 1;
1640 }
1641
1642 __setup("ip=", ip_auto_config_setup);
1643 __setup("nfsaddrs=", nfsaddrs_config_setup);
1644 __setup("dhcpclass=", vendor_class_identifier_setup);
Linux kernel - Deliverables
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