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x86/speculation/mds: Fix documentation typo
[linux/fpc-iii.git] / net / ipv4 / ipconfig.c
blobf0782c91514ce28bd62a37740d8cfa0f55895106
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
4 * user-supplied information to configure own IP address and routes.
5 *
6 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
7 *
8 * Derived from network configuration code in fs/nfs/nfsroot.c,
9 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
10 *
11 * BOOTP rewritten to construct and analyse packets itself instead
12 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
13 * -- MJ, December 1998
14 *
15 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
16 * initialization scheme.
17 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
18 *
19 * DHCP support added. To users this looks like a whole separate
20 * protocol, but we know it's just a bag on the side of BOOTP.
21 * -- Chip Salzenberg <chip@valinux.com>, May 2000
22 *
23 * Ported DHCP support from 2.2.16 to 2.4.0-test4
24 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
25 *
26 * Merged changes from 2.2.19 into 2.4.3
27 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
28 *
29 * Multiple Nameservers in /proc/net/pnp
30 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
31 */
32
33 #include <linux/types.h>
34 #include <linux/string.h>
35 #include <linux/kernel.h>
36 #include <linux/jiffies.h>
37 #include <linux/random.h>
38 #include <linux/init.h>
39 #include <linux/utsname.h>
40 #include <linux/in.h>
41 #include <linux/if.h>
42 #include <linux/inet.h>
43 #include <linux/inetdevice.h>
44 #include <linux/netdevice.h>
45 #include <linux/if_arp.h>
46 #include <linux/skbuff.h>
47 #include <linux/ip.h>
48 #include <linux/socket.h>
49 #include <linux/route.h>
50 #include <linux/udp.h>
51 #include <linux/proc_fs.h>
52 #include <linux/seq_file.h>
53 #include <linux/major.h>
54 #include <linux/root_dev.h>
55 #include <linux/delay.h>
56 #include <linux/nfs_fs.h>
57 #include <linux/slab.h>
58 #include <linux/export.h>
59 #include <net/net_namespace.h>
60 #include <net/arp.h>
61 #include <net/dsa.h>
62 #include <net/ip.h>
63 #include <net/ipconfig.h>
64 #include <net/route.h>
65
66 #include <linux/uaccess.h>
67 #include <net/checksum.h>
68 #include <asm/processor.h>
69
70 #if defined(CONFIG_IP_PNP_DHCP)
71 #define IPCONFIG_DHCP
72 #endif
73 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
74 #define IPCONFIG_BOOTP
75 #endif
76 #if defined(CONFIG_IP_PNP_RARP)
77 #define IPCONFIG_RARP
78 #endif
79 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
80 #define IPCONFIG_DYNAMIC
81 #endif
82
83 /* Define the friendly delay before and after opening net devices */
84 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
85 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
86
87 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
88 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
89 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
90 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
91 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
92 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
93 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
94 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
95 - '3' from resolv.h */
96
97 #define NONE cpu_to_be32(INADDR_NONE)
98 #define ANY cpu_to_be32(INADDR_ANY)
99
100 /*
101 * Public IP configuration
102 */
103
104 /* This is used by platforms which might be able to set the ipconfig
105 * variables using firmware environment vars. If this is set, it will
106 * ignore such firmware variables.
107 */
108 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
109
110 static int ic_enable __initdata; /* IP config enabled? */
111
112 /* Protocol choice */
113 int ic_proto_enabled __initdata = 0
114 #ifdef IPCONFIG_BOOTP
115 | IC_BOOTP
116 #endif
117 #ifdef CONFIG_IP_PNP_DHCP
118 | IC_USE_DHCP
119 #endif
120 #ifdef IPCONFIG_RARP
121 | IC_RARP
122 #endif
123 ;
124
125 static int ic_host_name_set __initdata; /* Host name set by us? */
126
127 __be32 ic_myaddr = NONE; /* My IP address */
128 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
129 __be32 ic_gateway = NONE; /* Gateway IP address */
130
131 #ifdef IPCONFIG_DYNAMIC
132 static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */
133 #endif
134
135 __be32 ic_servaddr = NONE; /* Boot server IP address */
136
137 __be32 root_server_addr = NONE; /* Address of NFS server */
138 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
139
140 /* vendor class identifier */
141 static char vendor_class_identifier[253] __initdata;
142
143 #if defined(CONFIG_IP_PNP_DHCP)
144 static char dhcp_client_identifier[253] __initdata;
145 #endif
146
147 /* Persistent data: */
148
149 #ifdef IPCONFIG_DYNAMIC
150 static int ic_proto_used; /* Protocol used, if any */
151 #else
152 #define ic_proto_used 0
153 #endif
154 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
155 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
156
157 /*
158 * Private state.
159 */
160
161 /* Name of user-selected boot device */
162 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
163
164 /* Protocols supported by available interfaces */
165 static int ic_proto_have_if __initdata;
166
167 /* MTU for boot device */
168 static int ic_dev_mtu __initdata;
169
170 #ifdef IPCONFIG_DYNAMIC
171 static DEFINE_SPINLOCK(ic_recv_lock);
172 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */
173 #endif
174 #ifdef IPCONFIG_DHCP
175 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */
176 #endif
177
178
179 /*
180 * Network devices
181 */
182
183 struct ic_device {
184 struct ic_device *next;
185 struct net_device *dev;
186 unsigned short flags;
187 short able;
188 __be32 xid;
189 };
190
191 static struct ic_device *ic_first_dev __initdata; /* List of open device */
192 static struct ic_device *ic_dev __initdata; /* Selected device */
193
194 static bool __init ic_is_init_dev(struct net_device *dev)
195 {
196 if (dev->flags & IFF_LOOPBACK)
197 return false;
198 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
199 (!(dev->flags & IFF_LOOPBACK) &&
200 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
201 strncmp(dev->name, "dummy", 5));
202 }
203
204 static int __init ic_open_devs(void)
205 {
206 struct ic_device *d, **last;
207 struct net_device *dev;
208 unsigned short oflags;
209 unsigned long start, next_msg;
210
211 last = &ic_first_dev;
212 rtnl_lock();
213
214 /* bring loopback and DSA master network devices up first */
215 for_each_netdev(&init_net, dev) {
216 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
217 continue;
218 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
219 pr_err("IP-Config: Failed to open %s\n", dev->name);
220 }
221
222 for_each_netdev(&init_net, dev) {
223 if (ic_is_init_dev(dev)) {
224 int able = 0;
225 if (dev->mtu >= 364)
226 able |= IC_BOOTP;
227 else
228 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
229 dev->name, dev->mtu);
230 if (!(dev->flags & IFF_NOARP))
231 able |= IC_RARP;
232 able &= ic_proto_enabled;
233 if (ic_proto_enabled && !able)
234 continue;
235 oflags = dev->flags;
236 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
237 pr_err("IP-Config: Failed to open %s\n",
238 dev->name);
239 continue;
240 }
241 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
242 rtnl_unlock();
243 return -ENOMEM;
244 }
245 d->dev = dev;
246 *last = d;
247 last = &d->next;
248 d->flags = oflags;
249 d->able = able;
250 if (able & IC_BOOTP)
251 get_random_bytes(&d->xid, sizeof(__be32));
252 else
253 d->xid = 0;
254 ic_proto_have_if |= able;
255 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
256 dev->name, able, d->xid);
257 }
258 }
259
260 /* no point in waiting if we could not bring up at least one device */
261 if (!ic_first_dev)
262 goto have_carrier;
263
264 /* wait for a carrier on at least one device */
265 start = jiffies;
266 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
267 while (time_before(jiffies, start +
268 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
269 int wait, elapsed;
270
271 for_each_netdev(&init_net, dev)
272 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
273 goto have_carrier;
274
275 msleep(1);
276
277 if (time_before(jiffies, next_msg))
278 continue;
279
280 elapsed = jiffies_to_msecs(jiffies - start);
281 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
282 pr_info("Waiting up to %d more seconds for network.\n", wait);
283 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
284 }
285 have_carrier:
286 rtnl_unlock();
287
288 *last = NULL;
289
290 if (!ic_first_dev) {
291 if (user_dev_name[0])
292 pr_err("IP-Config: Device `%s' not found\n",
293 user_dev_name);
294 else
295 pr_err("IP-Config: No network devices available\n");
296 return -ENODEV;
297 }
298 return 0;
299 }
300
301 static void __init ic_close_devs(void)
302 {
303 struct ic_device *d, *next;
304 struct net_device *dev;
305
306 rtnl_lock();
307 next = ic_first_dev;
308 while ((d = next)) {
309 next = d->next;
310 dev = d->dev;
311 if (d != ic_dev && !netdev_uses_dsa(dev)) {
312 pr_debug("IP-Config: Downing %s\n", dev->name);
313 dev_change_flags(dev, d->flags);
314 }
315 kfree(d);
316 }
317 rtnl_unlock();
318 }
319
320 /*
321 * Interface to various network functions.
322 */
323
324 static inline void
325 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
326 {
327 sin->sin_family = AF_INET;
328 sin->sin_addr.s_addr = addr;
329 sin->sin_port = port;
330 }
331
332 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
333 {
334 int res;
335
336 mm_segment_t oldfs = get_fs();
337 set_fs(get_ds());
338 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
339 set_fs(oldfs);
340 return res;
341 }
342
343 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
344 {
345 int res;
346
347 mm_segment_t oldfs = get_fs();
348 set_fs(get_ds());
349 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
350 set_fs(oldfs);
351 return res;
352 }
353
354 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
355 {
356 int res;
357
358 mm_segment_t oldfs = get_fs();
359 set_fs(get_ds());
360 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
361 set_fs(oldfs);
362 return res;
363 }
364
365 /*
366 * Set up interface addresses and routes.
367 */
368
369 static int __init ic_setup_if(void)
370 {
371 struct ifreq ir;
372 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
373 int err;
374
375 memset(&ir, 0, sizeof(ir));
376 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name);
377 set_sockaddr(sin, ic_myaddr, 0);
378 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
379 pr_err("IP-Config: Unable to set interface address (%d)\n",
380 err);
381 return -1;
382 }
383 set_sockaddr(sin, ic_netmask, 0);
384 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
385 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
386 err);
387 return -1;
388 }
389 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
390 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
391 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
392 err);
393 return -1;
394 }
395 /* Handle the case where we need non-standard MTU on the boot link (a network
396 * using jumbo frames, for instance). If we can't set the mtu, don't error
397 * out, we'll try to muddle along.
398 */
399 if (ic_dev_mtu != 0) {
400 strcpy(ir.ifr_name, ic_dev->dev->name);
401 ir.ifr_mtu = ic_dev_mtu;
402 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
403 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
404 ic_dev_mtu, err);
405 }
406 return 0;
407 }
408
409 static int __init ic_setup_routes(void)
410 {
411 /* No need to setup device routes, only the default route... */
412
413 if (ic_gateway != NONE) {
414 struct rtentry rm;
415 int err;
416
417 memset(&rm, 0, sizeof(rm));
418 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
419 pr_err("IP-Config: Gateway not on directly connected network\n");
420 return -1;
421 }
422 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
423 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
424 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
425 rm.rt_flags = RTF_UP | RTF_GATEWAY;
426 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
427 pr_err("IP-Config: Cannot add default route (%d)\n",
428 err);
429 return -1;
430 }
431 }
432
433 return 0;
434 }
435
436 /*
437 * Fill in default values for all missing parameters.
438 */
439
440 static int __init ic_defaults(void)
441 {
442 /*
443 * At this point we have no userspace running so need not
444 * claim locks on system_utsname
445 */
446
447 if (!ic_host_name_set)
448 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
449
450 if (root_server_addr == NONE)
451 root_server_addr = ic_servaddr;
452
453 if (ic_netmask == NONE) {
454 if (IN_CLASSA(ntohl(ic_myaddr)))
455 ic_netmask = htonl(IN_CLASSA_NET);
456 else if (IN_CLASSB(ntohl(ic_myaddr)))
457 ic_netmask = htonl(IN_CLASSB_NET);
458 else if (IN_CLASSC(ntohl(ic_myaddr)))
459 ic_netmask = htonl(IN_CLASSC_NET);
460 else {
461 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
462 &ic_myaddr);
463 return -1;
464 }
465 pr_notice("IP-Config: Guessing netmask %pI4\n",
466 &ic_netmask);
467 }
468
469 return 0;
470 }
471
472 /*
473 * RARP support.
474 */
475
476 #ifdef IPCONFIG_RARP
477
478 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
479
480 static struct packet_type rarp_packet_type __initdata = {
481 .type = cpu_to_be16(ETH_P_RARP),
482 .func = ic_rarp_recv,
483 };
484
485 static inline void __init ic_rarp_init(void)
486 {
487 dev_add_pack(&rarp_packet_type);
488 }
489
490 static inline void __init ic_rarp_cleanup(void)
491 {
492 dev_remove_pack(&rarp_packet_type);
493 }
494
495 /*
496 * Process received RARP packet.
497 */
498 static int __init
499 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
500 {
501 struct arphdr *rarp;
502 unsigned char *rarp_ptr;
503 __be32 sip, tip;
504 unsigned char *tha; /* t for "target" */
505 struct ic_device *d;
506
507 if (!net_eq(dev_net(dev), &init_net))
508 goto drop;
509
510 skb = skb_share_check(skb, GFP_ATOMIC);
511 if (!skb)
512 return NET_RX_DROP;
513
514 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
515 goto drop;
516
517 /* Basic sanity checks can be done without the lock. */
518 rarp = (struct arphdr *)skb_transport_header(skb);
519
520 /* If this test doesn't pass, it's not IP, or we should
521 * ignore it anyway.
522 */
523 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
524 goto drop;
525
526 /* If it's not a RARP reply, delete it. */
527 if (rarp->ar_op != htons(ARPOP_RREPLY))
528 goto drop;
529
530 /* If it's not Ethernet, delete it. */
531 if (rarp->ar_pro != htons(ETH_P_IP))
532 goto drop;
533
534 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
535 goto drop;
536
537 /* OK, it is all there and looks valid, process... */
538 rarp = (struct arphdr *)skb_transport_header(skb);
539 rarp_ptr = (unsigned char *) (rarp + 1);
540
541 /* One reply at a time, please. */
542 spin_lock(&ic_recv_lock);
543
544 /* If we already have a reply, just drop the packet */
545 if (ic_got_reply)
546 goto drop_unlock;
547
548 /* Find the ic_device that the packet arrived on */
549 d = ic_first_dev;
550 while (d && d->dev != dev)
551 d = d->next;
552 if (!d)
553 goto drop_unlock; /* should never happen */
554
555 /* Extract variable-width fields */
556 rarp_ptr += dev->addr_len;
557 memcpy(&sip, rarp_ptr, 4);
558 rarp_ptr += 4;
559 tha = rarp_ptr;
560 rarp_ptr += dev->addr_len;
561 memcpy(&tip, rarp_ptr, 4);
562
563 /* Discard packets which are not meant for us. */
564 if (memcmp(tha, dev->dev_addr, dev->addr_len))
565 goto drop_unlock;
566
567 /* Discard packets which are not from specified server. */
568 if (ic_servaddr != NONE && ic_servaddr != sip)
569 goto drop_unlock;
570
571 /* We have a winner! */
572 ic_dev = d;
573 if (ic_myaddr == NONE)
574 ic_myaddr = tip;
575 ic_servaddr = sip;
576 ic_addrservaddr = sip;
577 ic_got_reply = IC_RARP;
578
579 drop_unlock:
580 /* Show's over. Nothing to see here. */
581 spin_unlock(&ic_recv_lock);
582
583 drop:
584 /* Throw the packet out. */
585 kfree_skb(skb);
586 return 0;
587 }
588
589
590 /*
591 * Send RARP request packet over a single interface.
592 */
593 static void __init ic_rarp_send_if(struct ic_device *d)
594 {
595 struct net_device *dev = d->dev;
596 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
597 dev->dev_addr, dev->dev_addr);
598 }
599 #endif
600
601 /*
602 * Predefine Nameservers
603 */
604 static inline void __init ic_nameservers_predef(void)
605 {
606 int i;
607
608 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
609 ic_nameservers[i] = NONE;
610 }
611
612 /*
613 * DHCP/BOOTP support.
614 */
615
616 #ifdef IPCONFIG_BOOTP
617
618 struct bootp_pkt { /* BOOTP packet format */
619 struct iphdr iph; /* IP header */
620 struct udphdr udph; /* UDP header */
621 u8 op; /* 1=request, 2=reply */
622 u8 htype; /* HW address type */
623 u8 hlen; /* HW address length */
624 u8 hops; /* Used only by gateways */
625 __be32 xid; /* Transaction ID */
626 __be16 secs; /* Seconds since we started */
627 __be16 flags; /* Just what it says */
628 __be32 client_ip; /* Client's IP address if known */
629 __be32 your_ip; /* Assigned IP address */
630 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
631 __be32 relay_ip; /* IP address of BOOTP relay */
632 u8 hw_addr[16]; /* Client's HW address */
633 u8 serv_name[64]; /* Server host name */
634 u8 boot_file[128]; /* Name of boot file */
635 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
636 };
637
638 /* packet ops */
639 #define BOOTP_REQUEST 1
640 #define BOOTP_REPLY 2
641
642 /* DHCP message types */
643 #define DHCPDISCOVER 1
644 #define DHCPOFFER 2
645 #define DHCPREQUEST 3
646 #define DHCPDECLINE 4
647 #define DHCPACK 5
648 #define DHCPNAK 6
649 #define DHCPRELEASE 7
650 #define DHCPINFORM 8
651
652 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
653
654 static struct packet_type bootp_packet_type __initdata = {
655 .type = cpu_to_be16(ETH_P_IP),
656 .func = ic_bootp_recv,
657 };
658
659 /*
660 * Initialize DHCP/BOOTP extension fields in the request.
661 */
662
663 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
664
665 #ifdef IPCONFIG_DHCP
666
667 static void __init
668 ic_dhcp_init_options(u8 *options, struct ic_device *d)
669 {
670 u8 mt = ((ic_servaddr == NONE)
671 ? DHCPDISCOVER : DHCPREQUEST);
672 u8 *e = options;
673 int len;
674
675 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);
676
677 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
678 e += 4;
679
680 *e++ = 53; /* DHCP message type */
681 *e++ = 1;
682 *e++ = mt;
683
684 if (mt == DHCPREQUEST) {
685 *e++ = 54; /* Server ID (IP address) */
686 *e++ = 4;
687 memcpy(e, &ic_servaddr, 4);
688 e += 4;
689
690 *e++ = 50; /* Requested IP address */
691 *e++ = 4;
692 memcpy(e, &ic_myaddr, 4);
693 e += 4;
694 }
695
696 /* always? */
697 {
698 static const u8 ic_req_params[] = {
699 1, /* Subnet mask */
700 3, /* Default gateway */
701 6, /* DNS server */
702 12, /* Host name */
703 15, /* Domain name */
704 17, /* Boot path */
705 26, /* MTU */
706 40, /* NIS domain name */
707 };
708
709 *e++ = 55; /* Parameter request list */
710 *e++ = sizeof(ic_req_params);
711 memcpy(e, ic_req_params, sizeof(ic_req_params));
712 e += sizeof(ic_req_params);
713
714 if (ic_host_name_set) {
715 *e++ = 12; /* host-name */
716 len = strlen(utsname()->nodename);
717 *e++ = len;
718 memcpy(e, utsname()->nodename, len);
719 e += len;
720 }
721 if (*vendor_class_identifier) {
722 pr_info("DHCP: sending class identifier \"%s\"\n",
723 vendor_class_identifier);
724 *e++ = 60; /* Class-identifier */
725 len = strlen(vendor_class_identifier);
726 *e++ = len;
727 memcpy(e, vendor_class_identifier, len);
728 e += len;
729 }
730 len = strlen(dhcp_client_identifier + 1);
731 /* the minimum length of identifier is 2, include 1 byte type,
732 * and can not be larger than the length of options
733 */
734 if (len >= 1 && len < 312 - (e - options) - 1) {
735 *e++ = 61;
736 *e++ = len + 1;
737 memcpy(e, dhcp_client_identifier, len + 1);
738 e += len + 1;
739 }
740 }
741
742 *e++ = 255; /* End of the list */
743 }
744
745 #endif /* IPCONFIG_DHCP */
746
747 static void __init ic_bootp_init_ext(u8 *e)
748 {
749 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
750 e += 4;
751 *e++ = 1; /* Subnet mask request */
752 *e++ = 4;
753 e += 4;
754 *e++ = 3; /* Default gateway request */
755 *e++ = 4;
756 e += 4;
757 *e++ = 5; /* Name server request */
758 *e++ = 8;
759 e += 8;
760 *e++ = 12; /* Host name request */
761 *e++ = 32;
762 e += 32;
763 *e++ = 40; /* NIS Domain name request */
764 *e++ = 32;
765 e += 32;
766 *e++ = 17; /* Boot path */
767 *e++ = 40;
768 e += 40;
769
770 *e++ = 57; /* set extension buffer size for reply */
771 *e++ = 2;
772 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
773 *e++ = 150;
774
775 *e++ = 255; /* End of the list */
776 }
777
778
779 /*
780 * Initialize the DHCP/BOOTP mechanism.
781 */
782 static inline void __init ic_bootp_init(void)
783 {
784 /* Re-initialise all name servers to NONE, in case any were set via the
785 * "ip=" or "nfsaddrs=" kernel command line parameters: any IP addresses
786 * specified there will already have been decoded but are no longer
787 * needed
788 */
789 ic_nameservers_predef();
790
791 dev_add_pack(&bootp_packet_type);
792 }
793
794
795 /*
796 * DHCP/BOOTP cleanup.
797 */
798 static inline void __init ic_bootp_cleanup(void)
799 {
800 dev_remove_pack(&bootp_packet_type);
801 }
802
803
804 /*
805 * Send DHCP/BOOTP request to single interface.
806 */
807 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
808 {
809 struct net_device *dev = d->dev;
810 struct sk_buff *skb;
811 struct bootp_pkt *b;
812 struct iphdr *h;
813 int hlen = LL_RESERVED_SPACE(dev);
814 int tlen = dev->needed_tailroom;
815
816 /* Allocate packet */
817 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
818 GFP_KERNEL);
819 if (!skb)
820 return;
821 skb_reserve(skb, hlen);
822 b = skb_put_zero(skb, sizeof(struct bootp_pkt));
823
824 /* Construct IP header */
825 skb_reset_network_header(skb);
826 h = ip_hdr(skb);
827 h->version = 4;
828 h->ihl = 5;
829 h->tot_len = htons(sizeof(struct bootp_pkt));
830 h->frag_off = htons(IP_DF);
831 h->ttl = 64;
832 h->protocol = IPPROTO_UDP;
833 h->daddr = htonl(INADDR_BROADCAST);
834 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
835
836 /* Construct UDP header */
837 b->udph.source = htons(68);
838 b->udph.dest = htons(67);
839 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
840 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
841
842 /* Construct DHCP/BOOTP header */
843 b->op = BOOTP_REQUEST;
844 if (dev->type < 256) /* check for false types */
845 b->htype = dev->type;
846 else if (dev->type == ARPHRD_FDDI)
847 b->htype = ARPHRD_ETHER;
848 else {
849 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
850 dev->name);
851 b->htype = dev->type; /* can cause undefined behavior */
852 }
853
854 /* server_ip and your_ip address are both already zero per RFC2131 */
855 b->hlen = dev->addr_len;
856 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
857 b->secs = htons(jiffies_diff / HZ);
858 b->xid = d->xid;
859
860 /* add DHCP options or BOOTP extensions */
861 #ifdef IPCONFIG_DHCP
862 if (ic_proto_enabled & IC_USE_DHCP)
863 ic_dhcp_init_options(b->exten, d);
864 else
865 #endif
866 ic_bootp_init_ext(b->exten);
867
868 /* Chain packet down the line... */
869 skb->dev = dev;
870 skb->protocol = htons(ETH_P_IP);
871 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
872 dev->broadcast, dev->dev_addr, skb->len) < 0) {
873 kfree_skb(skb);
874 printk("E");
875 return;
876 }
877
878 if (dev_queue_xmit(skb) < 0)
879 printk("E");
880 }
881
882
883 /*
884 * Copy BOOTP-supplied string if not already set.
885 */
886 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
887 {
888 if (!len)
889 return 0;
890 if (len > max-1)
891 len = max-1;
892 memcpy(dest, src, len);
893 dest[len] = '\0';
894 return 1;
895 }
896
897
898 /*
899 * Process BOOTP extensions.
900 */
901 static void __init ic_do_bootp_ext(u8 *ext)
902 {
903 u8 servers;
904 int i;
905 __be16 mtu;
906
907 u8 *c;
908
909 pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
910 for (c=ext+2; c<ext+2+ext[1]; c++)
911 pr_debug(" %02x", *c);
912 pr_debug("\n");
913
914 switch (*ext++) {
915 case 1: /* Subnet mask */
916 if (ic_netmask == NONE)
917 memcpy(&ic_netmask, ext+1, 4);
918 break;
919 case 3: /* Default gateway */
920 if (ic_gateway == NONE)
921 memcpy(&ic_gateway, ext+1, 4);
922 break;
923 case 6: /* DNS server */
924 servers= *ext/4;
925 if (servers > CONF_NAMESERVERS_MAX)
926 servers = CONF_NAMESERVERS_MAX;
927 for (i = 0; i < servers; i++) {
928 if (ic_nameservers[i] == NONE)
929 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
930 }
931 break;
932 case 12: /* Host name */
933 ic_bootp_string(utsname()->nodename, ext+1, *ext,
934 __NEW_UTS_LEN);
935 ic_host_name_set = 1;
936 break;
937 case 15: /* Domain name (DNS) */
938 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
939 break;
940 case 17: /* Root path */
941 if (!root_server_path[0])
942 ic_bootp_string(root_server_path, ext+1, *ext,
943 sizeof(root_server_path));
944 break;
945 case 26: /* Interface MTU */
946 memcpy(&mtu, ext+1, sizeof(mtu));
947 ic_dev_mtu = ntohs(mtu);
948 break;
949 case 40: /* NIS Domain name (_not_ DNS) */
950 ic_bootp_string(utsname()->domainname, ext+1, *ext,
951 __NEW_UTS_LEN);
952 break;
953 }
954 }
955
956
957 /*
958 * Receive BOOTP reply.
959 */
960 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
961 {
962 struct bootp_pkt *b;
963 struct iphdr *h;
964 struct ic_device *d;
965 int len, ext_len;
966
967 if (!net_eq(dev_net(dev), &init_net))
968 goto drop;
969
970 /* Perform verifications before taking the lock. */
971 if (skb->pkt_type == PACKET_OTHERHOST)
972 goto drop;
973
974 skb = skb_share_check(skb, GFP_ATOMIC);
975 if (!skb)
976 return NET_RX_DROP;
977
978 if (!pskb_may_pull(skb,
979 sizeof(struct iphdr) +
980 sizeof(struct udphdr)))
981 goto drop;
982
983 b = (struct bootp_pkt *)skb_network_header(skb);
984 h = &b->iph;
985
986 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
987 goto drop;
988
989 /* Fragments are not supported */
990 if (ip_is_fragment(h)) {
991 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
992 goto drop;
993 }
994
995 if (skb->len < ntohs(h->tot_len))
996 goto drop;
997
998 if (ip_fast_csum((char *) h, h->ihl))
999 goto drop;
1000
1001 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
1002 goto drop;
1003
1004 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1005 goto drop;
1006
1007 len = ntohs(b->udph.len) - sizeof(struct udphdr);
1008 ext_len = len - (sizeof(*b) -
1009 sizeof(struct iphdr) -
1010 sizeof(struct udphdr) -
1011 sizeof(b->exten));
1012 if (ext_len < 0)
1013 goto drop;
1014
1015 /* Ok the front looks good, make sure we can get at the rest. */
1016 if (!pskb_may_pull(skb, skb->len))
1017 goto drop;
1018
1019 b = (struct bootp_pkt *)skb_network_header(skb);
1020 h = &b->iph;
1021
1022 /* One reply at a time, please. */
1023 spin_lock(&ic_recv_lock);
1024
1025 /* If we already have a reply, just drop the packet */
1026 if (ic_got_reply)
1027 goto drop_unlock;
1028
1029 /* Find the ic_device that the packet arrived on */
1030 d = ic_first_dev;
1031 while (d && d->dev != dev)
1032 d = d->next;
1033 if (!d)
1034 goto drop_unlock; /* should never happen */
1035
1036 /* Is it a reply to our BOOTP request? */
1037 if (b->op != BOOTP_REPLY ||
1038 b->xid != d->xid) {
1039 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1040 d->dev->name, b->op, b->xid);
1041 goto drop_unlock;
1042 }
1043
1044 /* Parse extensions */
1045 if (ext_len >= 4 &&
1046 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1047 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1048 u8 *ext;
1049
1050 #ifdef IPCONFIG_DHCP
1051 if (ic_proto_enabled & IC_USE_DHCP) {
1052 __be32 server_id = NONE;
1053 int mt = 0;
1054
1055 ext = &b->exten[4];
1056 while (ext < end && *ext != 0xff) {
1057 u8 *opt = ext++;
1058 if (*opt == 0) /* Padding */
1059 continue;
1060 ext += *ext + 1;
1061 if (ext >= end)
1062 break;
1063 switch (*opt) {
1064 case 53: /* Message type */
1065 if (opt[1])
1066 mt = opt[2];
1067 break;
1068 case 54: /* Server ID (IP address) */
1069 if (opt[1] >= 4)
1070 memcpy(&server_id, opt + 2, 4);
1071 break;
1072 }
1073 }
1074
1075 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1076
1077 switch (mt) {
1078 case DHCPOFFER:
1079 /* While in the process of accepting one offer,
1080 * ignore all others.
1081 */
1082 if (ic_myaddr != NONE)
1083 goto drop_unlock;
1084
1085 /* Let's accept that offer. */
1086 ic_myaddr = b->your_ip;
1087 ic_servaddr = server_id;
1088 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1089 &ic_myaddr, &b->iph.saddr);
1090 /* The DHCP indicated server address takes
1091 * precedence over the bootp header one if
1092 * they are different.
1093 */
1094 if ((server_id != NONE) &&
1095 (b->server_ip != server_id))
1096 b->server_ip = ic_servaddr;
1097 break;
1098
1099 case DHCPACK:
1100 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1101 goto drop_unlock;
1102
1103 /* Yeah! */
1104 break;
1105
1106 default:
1107 /* Urque. Forget it*/
1108 ic_myaddr = NONE;
1109 ic_servaddr = NONE;
1110 goto drop_unlock;
1111 }
1112
1113 ic_dhcp_msgtype = mt;
1114
1115 }
1116 #endif /* IPCONFIG_DHCP */
1117
1118 ext = &b->exten[4];
1119 while (ext < end && *ext != 0xff) {
1120 u8 *opt = ext++;
1121 if (*opt == 0) /* Padding */
1122 continue;
1123 ext += *ext + 1;
1124 if (ext < end)
1125 ic_do_bootp_ext(opt);
1126 }
1127 }
1128
1129 /* We have a winner! */
1130 ic_dev = d;
1131 ic_myaddr = b->your_ip;
1132 ic_servaddr = b->server_ip;
1133 ic_addrservaddr = b->iph.saddr;
1134 if (ic_gateway == NONE && b->relay_ip)
1135 ic_gateway = b->relay_ip;
1136 if (ic_nameservers[0] == NONE)
1137 ic_nameservers[0] = ic_servaddr;
1138 ic_got_reply = IC_BOOTP;
1139
1140 drop_unlock:
1141 /* Show's over. Nothing to see here. */
1142 spin_unlock(&ic_recv_lock);
1143
1144 drop:
1145 /* Throw the packet out. */
1146 kfree_skb(skb);
1147
1148 return 0;
1149 }
1150
1151
1152 #endif
1153
1154
1155 /*
1156 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1157 */
1158
1159 #ifdef IPCONFIG_DYNAMIC
1160
1161 static int __init ic_dynamic(void)
1162 {
1163 int retries;
1164 struct ic_device *d;
1165 unsigned long start_jiffies, timeout, jiff;
1166 int do_bootp = ic_proto_have_if & IC_BOOTP;
1167 int do_rarp = ic_proto_have_if & IC_RARP;
1168
1169 /*
1170 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1171 * This routine gets only called when some pieces of information
1172 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1173 */
1174 if (!ic_proto_enabled) {
1175 pr_err("IP-Config: Incomplete network configuration information\n");
1176 return -1;
1177 }
1178
1179 #ifdef IPCONFIG_BOOTP
1180 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1181 pr_err("DHCP/BOOTP: No suitable device found\n");
1182 #endif
1183 #ifdef IPCONFIG_RARP
1184 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1185 pr_err("RARP: No suitable device found\n");
1186 #endif
1187
1188 if (!ic_proto_have_if)
1189 /* Error message already printed */
1190 return -1;
1191
1192 /*
1193 * Setup protocols
1194 */
1195 #ifdef IPCONFIG_BOOTP
1196 if (do_bootp)
1197 ic_bootp_init();
1198 #endif
1199 #ifdef IPCONFIG_RARP
1200 if (do_rarp)
1201 ic_rarp_init();
1202 #endif
1203
1204 /*
1205 * Send requests and wait, until we get an answer. This loop
1206 * seems to be a terrible waste of CPU time, but actually there is
1207 * only one process running at all, so we don't need to use any
1208 * scheduler functions.
1209 * [Actually we could now, but the nothing else running note still
1210 * applies.. - AC]
1211 */
1212 pr_notice("Sending %s%s%s requests .",
1213 do_bootp
1214 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1215 (do_bootp && do_rarp) ? " and " : "",
1216 do_rarp ? "RARP" : "");
1217
1218 start_jiffies = jiffies;
1219 d = ic_first_dev;
1220 retries = CONF_SEND_RETRIES;
1221 get_random_bytes(&timeout, sizeof(timeout));
1222 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1223 for (;;) {
1224 #ifdef IPCONFIG_BOOTP
1225 if (do_bootp && (d->able & IC_BOOTP))
1226 ic_bootp_send_if(d, jiffies - start_jiffies);
1227 #endif
1228 #ifdef IPCONFIG_RARP
1229 if (do_rarp && (d->able & IC_RARP))
1230 ic_rarp_send_if(d);
1231 #endif
1232
1233 if (!d->next) {
1234 jiff = jiffies + timeout;
1235 while (time_before(jiffies, jiff) && !ic_got_reply)
1236 schedule_timeout_uninterruptible(1);
1237 }
1238 #ifdef IPCONFIG_DHCP
1239 /* DHCP isn't done until we get a DHCPACK. */
1240 if ((ic_got_reply & IC_BOOTP) &&
1241 (ic_proto_enabled & IC_USE_DHCP) &&
1242 ic_dhcp_msgtype != DHCPACK) {
1243 ic_got_reply = 0;
1244 /* continue on device that got the reply */
1245 d = ic_dev;
1246 pr_cont(",");
1247 continue;
1248 }
1249 #endif /* IPCONFIG_DHCP */
1250
1251 if (ic_got_reply) {
1252 pr_cont(" OK\n");
1253 break;
1254 }
1255
1256 if ((d = d->next))
1257 continue;
1258
1259 if (! --retries) {
1260 pr_cont(" timed out!\n");
1261 break;
1262 }
1263
1264 d = ic_first_dev;
1265
1266 timeout = timeout CONF_TIMEOUT_MULT;
1267 if (timeout > CONF_TIMEOUT_MAX)
1268 timeout = CONF_TIMEOUT_MAX;
1269
1270 pr_cont(".");
1271 }
1272
1273 #ifdef IPCONFIG_BOOTP
1274 if (do_bootp)
1275 ic_bootp_cleanup();
1276 #endif
1277 #ifdef IPCONFIG_RARP
1278 if (do_rarp)
1279 ic_rarp_cleanup();
1280 #endif
1281
1282 if (!ic_got_reply) {
1283 ic_myaddr = NONE;
1284 return -1;
1285 }
1286
1287 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1288 ((ic_got_reply & IC_RARP) ? "RARP"
1289 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1290 &ic_addrservaddr, &ic_myaddr);
1291
1292 return 0;
1293 }
1294
1295 #endif /* IPCONFIG_DYNAMIC */
1296
1297 #ifdef CONFIG_PROC_FS
1298
1299 static int pnp_seq_show(struct seq_file *seq, void *v)
1300 {
1301 int i;
1302
1303 if (ic_proto_used & IC_PROTO)
1304 seq_printf(seq, "#PROTO: %s\n",
1305 (ic_proto_used & IC_RARP) ? "RARP"
1306 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1307 else
1308 seq_puts(seq, "#MANUAL\n");
1309
1310 if (ic_domain[0])
1311 seq_printf(seq,
1312 "domain %s\n", ic_domain);
1313 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1314 if (ic_nameservers[i] != NONE)
1315 seq_printf(seq, "nameserver %pI4\n",
1316 &ic_nameservers[i]);
1317 }
1318 if (ic_servaddr != NONE)
1319 seq_printf(seq, "bootserver %pI4\n",
1320 &ic_servaddr);
1321 return 0;
1322 }
1323
1324 static int pnp_seq_open(struct inode *indoe, struct file *file)
1325 {
1326 return single_open(file, pnp_seq_show, NULL);
1327 }
1328
1329 static const struct file_operations pnp_seq_fops = {
1330 .owner = THIS_MODULE,
1331 .open = pnp_seq_open,
1332 .read = seq_read,
1333 .llseek = seq_lseek,
1334 .release = single_release,
1335 };
1336 #endif /* CONFIG_PROC_FS */
1337
1338 /*
1339 * Extract IP address from the parameter string if needed. Note that we
1340 * need to have root_server_addr set _before_ IPConfig gets called as it
1341 * can override it.
1342 */
1343 __be32 __init root_nfs_parse_addr(char *name)
1344 {
1345 __be32 addr;
1346 int octets = 0;
1347 char *cp, *cq;
1348
1349 cp = cq = name;
1350 while (octets < 4) {
1351 while (*cp >= '0' && *cp <= '9')
1352 cp++;
1353 if (cp == cq || cp - cq > 3)
1354 break;
1355 if (*cp == '.' || octets == 3)
1356 octets++;
1357 if (octets < 4)
1358 cp++;
1359 cq = cp;
1360 }
1361 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1362 if (*cp == ':')
1363 *cp++ = '\0';
1364 addr = in_aton(name);
1365 memmove(name, cp, strlen(cp) + 1);
1366 } else
1367 addr = NONE;
1368
1369 return addr;
1370 }
1371
1372 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1373
1374 static int __init wait_for_devices(void)
1375 {
1376 int i;
1377
1378 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1379 struct net_device *dev;
1380 int found = 0;
1381
1382 rtnl_lock();
1383 for_each_netdev(&init_net, dev) {
1384 if (ic_is_init_dev(dev)) {
1385 found = 1;
1386 break;
1387 }
1388 }
1389 rtnl_unlock();
1390 if (found)
1391 return 0;
1392 ssleep(1);
1393 }
1394 return -ENODEV;
1395 }
1396
1397 /*
1398 * IP Autoconfig dispatcher.
1399 */
1400
1401 static int __init ip_auto_config(void)
1402 {
1403 __be32 addr;
1404 #ifdef IPCONFIG_DYNAMIC
1405 int retries = CONF_OPEN_RETRIES;
1406 #endif
1407 int err;
1408 unsigned int i;
1409
1410 /* Initialise all name servers to NONE (but only if the "ip=" or
1411 * "nfsaddrs=" kernel command line parameters weren't decoded, otherwise
1412 * we'll overwrite the IP addresses specified there)
1413 */
1414 if (ic_set_manually == 0)
1415 ic_nameservers_predef();
1416
1417 #ifdef CONFIG_PROC_FS
1418 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1419 #endif /* CONFIG_PROC_FS */
1420
1421 if (!ic_enable)
1422 return 0;
1423
1424 pr_debug("IP-Config: Entered.\n");
1425 #ifdef IPCONFIG_DYNAMIC
1426 try_try_again:
1427 #endif
1428 /* Wait for devices to appear */
1429 err = wait_for_devices();
1430 if (err)
1431 return err;
1432
1433 /* Setup all network devices */
1434 err = ic_open_devs();
1435 if (err)
1436 return err;
1437
1438 /* Give drivers a chance to settle */
1439 msleep(CONF_POST_OPEN);
1440
1441 /*
1442 * If the config information is insufficient (e.g., our IP address or
1443 * IP address of the boot server is missing or we have multiple network
1444 * interfaces and no default was set), use BOOTP or RARP to get the
1445 * missing values.
1446 */
1447 if (ic_myaddr == NONE ||
1448 #ifdef CONFIG_ROOT_NFS
1449 (root_server_addr == NONE &&
1450 ic_servaddr == NONE &&
1451 ROOT_DEV == Root_NFS) ||
1452 #endif
1453 ic_first_dev->next) {
1454 #ifdef IPCONFIG_DYNAMIC
1455 if (ic_dynamic() < 0) {
1456 ic_close_devs();
1457
1458 /*
1459 * I don't know why, but sometimes the
1460 * eepro100 driver (at least) gets upset and
1461 * doesn't work the first time it's opened.
1462 * But then if you close it and reopen it, it
1463 * works just fine. So we need to try that at
1464 * least once before giving up.
1465 *
1466 * Also, if the root will be NFS-mounted, we
1467 * have nowhere to go if DHCP fails. So we
1468 * just have to keep trying forever.
1469 *
1470 * -- Chip
1471 */
1472 #ifdef CONFIG_ROOT_NFS
1473 if (ROOT_DEV == Root_NFS) {
1474 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1475 goto try_try_again;
1476 }
1477 #endif
1478
1479 if (--retries) {
1480 pr_err("IP-Config: Reopening network devices...\n");
1481 goto try_try_again;
1482 }
1483
1484 /* Oh, well. At least we tried. */
1485 pr_err("IP-Config: Auto-configuration of network failed\n");
1486 return -1;
1487 }
1488 #else /* !DYNAMIC */
1489 pr_err("IP-Config: Incomplete network configuration information\n");
1490 ic_close_devs();
1491 return -1;
1492 #endif /* IPCONFIG_DYNAMIC */
1493 } else {
1494 /* Device selected manually or only one device -> use it */
1495 ic_dev = ic_first_dev;
1496 }
1497
1498 addr = root_nfs_parse_addr(root_server_path);
1499 if (root_server_addr == NONE)
1500 root_server_addr = addr;
1501
1502 /*
1503 * Use defaults wherever applicable.
1504 */
1505 if (ic_defaults() < 0)
1506 return -1;
1507
1508 /*
1509 * Record which protocol was actually used.
1510 */
1511 #ifdef IPCONFIG_DYNAMIC
1512 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1513 #endif
1514
1515 #ifndef IPCONFIG_SILENT
1516 /*
1517 * Clue in the operator.
1518 */
1519 pr_info("IP-Config: Complete:\n");
1520
1521 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1522 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1523 &ic_myaddr, &ic_netmask, &ic_gateway);
1524 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1525 utsname()->nodename, ic_domain, utsname()->domainname);
1526 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1527 &ic_servaddr, &root_server_addr, root_server_path);
1528 if (ic_dev_mtu)
1529 pr_cont(", mtu=%d", ic_dev_mtu);
1530 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1531 if (ic_nameservers[i] != NONE) {
1532 pr_cont(" nameserver%u=%pI4",
1533 i, &ic_nameservers[i]);
1534 break;
1535 }
1536 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1537 if (ic_nameservers[i] != NONE)
1538 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1539 pr_cont("\n");
1540 #endif /* !SILENT */
1541
1542 /*
1543 * Close all network devices except the device we've
1544 * autoconfigured and set up routes.
1545 */
1546 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1547 err = -1;
1548 else
1549 err = 0;
1550
1551 ic_close_devs();
1552
1553 return err;
1554 }
1555
1556 late_initcall(ip_auto_config);
1557
1558
1559 /*
1560 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1561 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1562 */
1563 static int __init ic_proto_name(char *name)
1564 {
1565 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1566 return 1;
1567 }
1568 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1569 return 0;
1570 }
1571 #ifdef CONFIG_IP_PNP_DHCP
1572 else if (!strncmp(name, "dhcp", 4)) {
1573 char *client_id;
1574
1575 ic_proto_enabled &= ~IC_RARP;
1576 client_id = strstr(name, "dhcp,");
1577 if (client_id) {
1578 char *v;
1579
1580 client_id = client_id + 5;
1581 v = strchr(client_id, ',');
1582 if (!v)
1583 return 1;
1584 *v = 0;
1585 if (kstrtou8(client_id, 0, dhcp_client_identifier))
1586 pr_debug("DHCP: Invalid client identifier type\n");
1587 strncpy(dhcp_client_identifier + 1, v + 1, 251);
1588 *v = ',';
1589 }
1590 return 1;
1591 }
1592 #endif
1593 #ifdef CONFIG_IP_PNP_BOOTP
1594 else if (!strcmp(name, "bootp")) {
1595 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1596 return 1;
1597 }
1598 #endif
1599 #ifdef CONFIG_IP_PNP_RARP
1600 else if (!strcmp(name, "rarp")) {
1601 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1602 return 1;
1603 }
1604 #endif
1605 #ifdef IPCONFIG_DYNAMIC
1606 else if (!strcmp(name, "both")) {
1607 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1608 return 1;
1609 }
1610 #endif
1611 return 0;
1612 }
1613
1614 static int __init ip_auto_config_setup(char *addrs)
1615 {
1616 char *cp, *ip, *dp;
1617 int num = 0;
1618
1619 ic_set_manually = 1;
1620 ic_enable = 1;
1621
1622 /*
1623 * If any dhcp, bootp etc options are set, leave autoconfig on
1624 * and skip the below static IP processing.
1625 */
1626 if (ic_proto_name(addrs))
1627 return 1;
1628
1629 /* If no static IP is given, turn off autoconfig and bail. */
1630 if (*addrs == 0 ||
1631 strcmp(addrs, "off") == 0 ||
1632 strcmp(addrs, "none") == 0) {
1633 ic_enable = 0;
1634 return 1;
1635 }
1636
1637 /* Initialise all name servers to NONE */
1638 ic_nameservers_predef();
1639
1640 /* Parse string for static IP assignment. */
1641 ip = addrs;
1642 while (ip && *ip) {
1643 if ((cp = strchr(ip, ':')))
1644 *cp++ = '\0';
1645 if (strlen(ip) > 0) {
1646 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1647 switch (num) {
1648 case 0:
1649 if ((ic_myaddr = in_aton(ip)) == ANY)
1650 ic_myaddr = NONE;
1651 break;
1652 case 1:
1653 if ((ic_servaddr = in_aton(ip)) == ANY)
1654 ic_servaddr = NONE;
1655 break;
1656 case 2:
1657 if ((ic_gateway = in_aton(ip)) == ANY)
1658 ic_gateway = NONE;
1659 break;
1660 case 3:
1661 if ((ic_netmask = in_aton(ip)) == ANY)
1662 ic_netmask = NONE;
1663 break;
1664 case 4:
1665 if ((dp = strchr(ip, '.'))) {
1666 *dp++ = '\0';
1667 strlcpy(utsname()->domainname, dp,
1668 sizeof(utsname()->domainname));
1669 }
1670 strlcpy(utsname()->nodename, ip,
1671 sizeof(utsname()->nodename));
1672 ic_host_name_set = 1;
1673 break;
1674 case 5:
1675 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1676 break;
1677 case 6:
1678 if (ic_proto_name(ip) == 0 &&
1679 ic_myaddr == NONE) {
1680 ic_enable = 0;
1681 }
1682 break;
1683 case 7:
1684 if (CONF_NAMESERVERS_MAX >= 1) {
1685 ic_nameservers[0] = in_aton(ip);
1686 if (ic_nameservers[0] == ANY)
1687 ic_nameservers[0] = NONE;
1688 }
1689 break;
1690 case 8:
1691 if (CONF_NAMESERVERS_MAX >= 2) {
1692 ic_nameservers[1] = in_aton(ip);
1693 if (ic_nameservers[1] == ANY)
1694 ic_nameservers[1] = NONE;
1695 }
1696 break;
1697 }
1698 }
1699 ip = cp;
1700 num++;
1701 }
1702
1703 return 1;
1704 }
1705 __setup("ip=", ip_auto_config_setup);
1706
1707 static int __init nfsaddrs_config_setup(char *addrs)
1708 {
1709 return ip_auto_config_setup(addrs);
1710 }
1711 __setup("nfsaddrs=", nfsaddrs_config_setup);
1712
1713 static int __init vendor_class_identifier_setup(char *addrs)
1714 {
1715 if (strlcpy(vendor_class_identifier, addrs,
1716 sizeof(vendor_class_identifier))
1717 >= sizeof(vendor_class_identifier))
1718 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1719 vendor_class_identifier);
1720 return 1;
1721 }
1722 __setup("dhcpclass=", vendor_class_identifier_setup);
Linux with added FPC-III support