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Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
[mirror_ubuntu-focal-kernel.git] / net / ipv4 / ipconfig.c
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 ic_nameservers_predef();
785
786 dev_add_pack(&bootp_packet_type);
787 }
788
789
790 /*
791 * DHCP/BOOTP cleanup.
792 */
793 static inline void __init ic_bootp_cleanup(void)
794 {
795 dev_remove_pack(&bootp_packet_type);
796 }
797
798
799 /*
800 * Send DHCP/BOOTP request to single interface.
801 */
802 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
803 {
804 struct net_device *dev = d->dev;
805 struct sk_buff *skb;
806 struct bootp_pkt *b;
807 struct iphdr *h;
808 int hlen = LL_RESERVED_SPACE(dev);
809 int tlen = dev->needed_tailroom;
810
811 /* Allocate packet */
812 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
813 GFP_KERNEL);
814 if (!skb)
815 return;
816 skb_reserve(skb, hlen);
817 b = skb_put_zero(skb, sizeof(struct bootp_pkt));
818
819 /* Construct IP header */
820 skb_reset_network_header(skb);
821 h = ip_hdr(skb);
822 h->version = 4;
823 h->ihl = 5;
824 h->tot_len = htons(sizeof(struct bootp_pkt));
825 h->frag_off = htons(IP_DF);
826 h->ttl = 64;
827 h->protocol = IPPROTO_UDP;
828 h->daddr = htonl(INADDR_BROADCAST);
829 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
830
831 /* Construct UDP header */
832 b->udph.source = htons(68);
833 b->udph.dest = htons(67);
834 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
835 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
836
837 /* Construct DHCP/BOOTP header */
838 b->op = BOOTP_REQUEST;
839 if (dev->type < 256) /* check for false types */
840 b->htype = dev->type;
841 else if (dev->type == ARPHRD_FDDI)
842 b->htype = ARPHRD_ETHER;
843 else {
844 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
845 dev->name);
846 b->htype = dev->type; /* can cause undefined behavior */
847 }
848
849 /* server_ip and your_ip address are both already zero per RFC2131 */
850 b->hlen = dev->addr_len;
851 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
852 b->secs = htons(jiffies_diff / HZ);
853 b->xid = d->xid;
854
855 /* add DHCP options or BOOTP extensions */
856 #ifdef IPCONFIG_DHCP
857 if (ic_proto_enabled & IC_USE_DHCP)
858 ic_dhcp_init_options(b->exten, d);
859 else
860 #endif
861 ic_bootp_init_ext(b->exten);
862
863 /* Chain packet down the line... */
864 skb->dev = dev;
865 skb->protocol = htons(ETH_P_IP);
866 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
867 dev->broadcast, dev->dev_addr, skb->len) < 0) {
868 kfree_skb(skb);
869 printk("E");
870 return;
871 }
872
873 if (dev_queue_xmit(skb) < 0)
874 printk("E");
875 }
876
877
878 /*
879 * Copy BOOTP-supplied string if not already set.
880 */
881 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
882 {
883 if (!len)
884 return 0;
885 if (len > max-1)
886 len = max-1;
887 memcpy(dest, src, len);
888 dest[len] = '\0';
889 return 1;
890 }
891
892
893 /*
894 * Process BOOTP extensions.
895 */
896 static void __init ic_do_bootp_ext(u8 *ext)
897 {
898 u8 servers;
899 int i;
900 __be16 mtu;
901
902 u8 *c;
903
904 pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
905 for (c=ext+2; c<ext+2+ext[1]; c++)
906 pr_debug(" %02x", *c);
907 pr_debug("\n");
908
909 switch (*ext++) {
910 case 1: /* Subnet mask */
911 if (ic_netmask == NONE)
912 memcpy(&ic_netmask, ext+1, 4);
913 break;
914 case 3: /* Default gateway */
915 if (ic_gateway == NONE)
916 memcpy(&ic_gateway, ext+1, 4);
917 break;
918 case 6: /* DNS server */
919 servers= *ext/4;
920 if (servers > CONF_NAMESERVERS_MAX)
921 servers = CONF_NAMESERVERS_MAX;
922 for (i = 0; i < servers; i++) {
923 if (ic_nameservers[i] == NONE)
924 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
925 }
926 break;
927 case 12: /* Host name */
928 ic_bootp_string(utsname()->nodename, ext+1, *ext,
929 __NEW_UTS_LEN);
930 ic_host_name_set = 1;
931 break;
932 case 15: /* Domain name (DNS) */
933 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
934 break;
935 case 17: /* Root path */
936 if (!root_server_path[0])
937 ic_bootp_string(root_server_path, ext+1, *ext,
938 sizeof(root_server_path));
939 break;
940 case 26: /* Interface MTU */
941 memcpy(&mtu, ext+1, sizeof(mtu));
942 ic_dev_mtu = ntohs(mtu);
943 break;
944 case 40: /* NIS Domain name (_not_ DNS) */
945 ic_bootp_string(utsname()->domainname, ext+1, *ext,
946 __NEW_UTS_LEN);
947 break;
948 }
949 }
950
951
952 /*
953 * Receive BOOTP reply.
954 */
955 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
956 {
957 struct bootp_pkt *b;
958 struct iphdr *h;
959 struct ic_device *d;
960 int len, ext_len;
961
962 if (!net_eq(dev_net(dev), &init_net))
963 goto drop;
964
965 /* Perform verifications before taking the lock. */
966 if (skb->pkt_type == PACKET_OTHERHOST)
967 goto drop;
968
969 skb = skb_share_check(skb, GFP_ATOMIC);
970 if (!skb)
971 return NET_RX_DROP;
972
973 if (!pskb_may_pull(skb,
974 sizeof(struct iphdr) +
975 sizeof(struct udphdr)))
976 goto drop;
977
978 b = (struct bootp_pkt *)skb_network_header(skb);
979 h = &b->iph;
980
981 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
982 goto drop;
983
984 /* Fragments are not supported */
985 if (ip_is_fragment(h)) {
986 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
987 goto drop;
988 }
989
990 if (skb->len < ntohs(h->tot_len))
991 goto drop;
992
993 if (ip_fast_csum((char *) h, h->ihl))
994 goto drop;
995
996 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
997 goto drop;
998
999 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1000 goto drop;
1001
1002 len = ntohs(b->udph.len) - sizeof(struct udphdr);
1003 ext_len = len - (sizeof(*b) -
1004 sizeof(struct iphdr) -
1005 sizeof(struct udphdr) -
1006 sizeof(b->exten));
1007 if (ext_len < 0)
1008 goto drop;
1009
1010 /* Ok the front looks good, make sure we can get at the rest. */
1011 if (!pskb_may_pull(skb, skb->len))
1012 goto drop;
1013
1014 b = (struct bootp_pkt *)skb_network_header(skb);
1015 h = &b->iph;
1016
1017 /* One reply at a time, please. */
1018 spin_lock(&ic_recv_lock);
1019
1020 /* If we already have a reply, just drop the packet */
1021 if (ic_got_reply)
1022 goto drop_unlock;
1023
1024 /* Find the ic_device that the packet arrived on */
1025 d = ic_first_dev;
1026 while (d && d->dev != dev)
1027 d = d->next;
1028 if (!d)
1029 goto drop_unlock; /* should never happen */
1030
1031 /* Is it a reply to our BOOTP request? */
1032 if (b->op != BOOTP_REPLY ||
1033 b->xid != d->xid) {
1034 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1035 d->dev->name, b->op, b->xid);
1036 goto drop_unlock;
1037 }
1038
1039 /* Parse extensions */
1040 if (ext_len >= 4 &&
1041 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1042 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1043 u8 *ext;
1044
1045 #ifdef IPCONFIG_DHCP
1046 if (ic_proto_enabled & IC_USE_DHCP) {
1047 __be32 server_id = NONE;
1048 int mt = 0;
1049
1050 ext = &b->exten[4];
1051 while (ext < end && *ext != 0xff) {
1052 u8 *opt = ext++;
1053 if (*opt == 0) /* Padding */
1054 continue;
1055 ext += *ext + 1;
1056 if (ext >= end)
1057 break;
1058 switch (*opt) {
1059 case 53: /* Message type */
1060 if (opt[1])
1061 mt = opt[2];
1062 break;
1063 case 54: /* Server ID (IP address) */
1064 if (opt[1] >= 4)
1065 memcpy(&server_id, opt + 2, 4);
1066 break;
1067 }
1068 }
1069
1070 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1071
1072 switch (mt) {
1073 case DHCPOFFER:
1074 /* While in the process of accepting one offer,
1075 * ignore all others.
1076 */
1077 if (ic_myaddr != NONE)
1078 goto drop_unlock;
1079
1080 /* Let's accept that offer. */
1081 ic_myaddr = b->your_ip;
1082 ic_servaddr = server_id;
1083 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1084 &ic_myaddr, &b->iph.saddr);
1085 /* The DHCP indicated server address takes
1086 * precedence over the bootp header one if
1087 * they are different.
1088 */
1089 if ((server_id != NONE) &&
1090 (b->server_ip != server_id))
1091 b->server_ip = ic_servaddr;
1092 break;
1093
1094 case DHCPACK:
1095 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1096 goto drop_unlock;
1097
1098 /* Yeah! */
1099 break;
1100
1101 default:
1102 /* Urque. Forget it*/
1103 ic_myaddr = NONE;
1104 ic_servaddr = NONE;
1105 goto drop_unlock;
1106 }
1107
1108 ic_dhcp_msgtype = mt;
1109
1110 }
1111 #endif /* IPCONFIG_DHCP */
1112
1113 ext = &b->exten[4];
1114 while (ext < end && *ext != 0xff) {
1115 u8 *opt = ext++;
1116 if (*opt == 0) /* Padding */
1117 continue;
1118 ext += *ext + 1;
1119 if (ext < end)
1120 ic_do_bootp_ext(opt);
1121 }
1122 }
1123
1124 /* We have a winner! */
1125 ic_dev = d;
1126 ic_myaddr = b->your_ip;
1127 ic_servaddr = b->server_ip;
1128 ic_addrservaddr = b->iph.saddr;
1129 if (ic_gateway == NONE && b->relay_ip)
1130 ic_gateway = b->relay_ip;
1131 if (ic_nameservers[0] == NONE)
1132 ic_nameservers[0] = ic_servaddr;
1133 ic_got_reply = IC_BOOTP;
1134
1135 drop_unlock:
1136 /* Show's over. Nothing to see here. */
1137 spin_unlock(&ic_recv_lock);
1138
1139 drop:
1140 /* Throw the packet out. */
1141 kfree_skb(skb);
1142
1143 return 0;
1144 }
1145
1146
1147 #endif
1148
1149
1150 /*
1151 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1152 */
1153
1154 #ifdef IPCONFIG_DYNAMIC
1155
1156 static int __init ic_dynamic(void)
1157 {
1158 int retries;
1159 struct ic_device *d;
1160 unsigned long start_jiffies, timeout, jiff;
1161 int do_bootp = ic_proto_have_if & IC_BOOTP;
1162 int do_rarp = ic_proto_have_if & IC_RARP;
1163
1164 /*
1165 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1166 * This routine gets only called when some pieces of information
1167 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1168 */
1169 if (!ic_proto_enabled) {
1170 pr_err("IP-Config: Incomplete network configuration information\n");
1171 return -1;
1172 }
1173
1174 #ifdef IPCONFIG_BOOTP
1175 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1176 pr_err("DHCP/BOOTP: No suitable device found\n");
1177 #endif
1178 #ifdef IPCONFIG_RARP
1179 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1180 pr_err("RARP: No suitable device found\n");
1181 #endif
1182
1183 if (!ic_proto_have_if)
1184 /* Error message already printed */
1185 return -1;
1186
1187 /*
1188 * Setup protocols
1189 */
1190 #ifdef IPCONFIG_BOOTP
1191 if (do_bootp)
1192 ic_bootp_init();
1193 #endif
1194 #ifdef IPCONFIG_RARP
1195 if (do_rarp)
1196 ic_rarp_init();
1197 #endif
1198
1199 /*
1200 * Send requests and wait, until we get an answer. This loop
1201 * seems to be a terrible waste of CPU time, but actually there is
1202 * only one process running at all, so we don't need to use any
1203 * scheduler functions.
1204 * [Actually we could now, but the nothing else running note still
1205 * applies.. - AC]
1206 */
1207 pr_notice("Sending %s%s%s requests .",
1208 do_bootp
1209 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1210 (do_bootp && do_rarp) ? " and " : "",
1211 do_rarp ? "RARP" : "");
1212
1213 start_jiffies = jiffies;
1214 d = ic_first_dev;
1215 retries = CONF_SEND_RETRIES;
1216 get_random_bytes(&timeout, sizeof(timeout));
1217 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1218 for (;;) {
1219 #ifdef IPCONFIG_BOOTP
1220 if (do_bootp && (d->able & IC_BOOTP))
1221 ic_bootp_send_if(d, jiffies - start_jiffies);
1222 #endif
1223 #ifdef IPCONFIG_RARP
1224 if (do_rarp && (d->able & IC_RARP))
1225 ic_rarp_send_if(d);
1226 #endif
1227
1228 if (!d->next) {
1229 jiff = jiffies + timeout;
1230 while (time_before(jiffies, jiff) && !ic_got_reply)
1231 schedule_timeout_uninterruptible(1);
1232 }
1233 #ifdef IPCONFIG_DHCP
1234 /* DHCP isn't done until we get a DHCPACK. */
1235 if ((ic_got_reply & IC_BOOTP) &&
1236 (ic_proto_enabled & IC_USE_DHCP) &&
1237 ic_dhcp_msgtype != DHCPACK) {
1238 ic_got_reply = 0;
1239 /* continue on device that got the reply */
1240 d = ic_dev;
1241 pr_cont(",");
1242 continue;
1243 }
1244 #endif /* IPCONFIG_DHCP */
1245
1246 if (ic_got_reply) {
1247 pr_cont(" OK\n");
1248 break;
1249 }
1250
1251 if ((d = d->next))
1252 continue;
1253
1254 if (! --retries) {
1255 pr_cont(" timed out!\n");
1256 break;
1257 }
1258
1259 d = ic_first_dev;
1260
1261 timeout = timeout CONF_TIMEOUT_MULT;
1262 if (timeout > CONF_TIMEOUT_MAX)
1263 timeout = CONF_TIMEOUT_MAX;
1264
1265 pr_cont(".");
1266 }
1267
1268 #ifdef IPCONFIG_BOOTP
1269 if (do_bootp)
1270 ic_bootp_cleanup();
1271 #endif
1272 #ifdef IPCONFIG_RARP
1273 if (do_rarp)
1274 ic_rarp_cleanup();
1275 #endif
1276
1277 if (!ic_got_reply) {
1278 ic_myaddr = NONE;
1279 return -1;
1280 }
1281
1282 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1283 ((ic_got_reply & IC_RARP) ? "RARP"
1284 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1285 &ic_addrservaddr, &ic_myaddr);
1286
1287 return 0;
1288 }
1289
1290 #endif /* IPCONFIG_DYNAMIC */
1291
1292 #ifdef CONFIG_PROC_FS
1293
1294 static int pnp_seq_show(struct seq_file *seq, void *v)
1295 {
1296 int i;
1297
1298 if (ic_proto_used & IC_PROTO)
1299 seq_printf(seq, "#PROTO: %s\n",
1300 (ic_proto_used & IC_RARP) ? "RARP"
1301 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1302 else
1303 seq_puts(seq, "#MANUAL\n");
1304
1305 if (ic_domain[0])
1306 seq_printf(seq,
1307 "domain %s\n", ic_domain);
1308 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1309 if (ic_nameservers[i] != NONE)
1310 seq_printf(seq, "nameserver %pI4\n",
1311 &ic_nameservers[i]);
1312 }
1313 if (ic_servaddr != NONE)
1314 seq_printf(seq, "bootserver %pI4\n",
1315 &ic_servaddr);
1316 return 0;
1317 }
1318
1319 static int pnp_seq_open(struct inode *indoe, struct file *file)
1320 {
1321 return single_open(file, pnp_seq_show, NULL);
1322 }
1323
1324 static const struct file_operations pnp_seq_fops = {
1325 .owner = THIS_MODULE,
1326 .open = pnp_seq_open,
1327 .read = seq_read,
1328 .llseek = seq_lseek,
1329 .release = single_release,
1330 };
1331 #endif /* CONFIG_PROC_FS */
1332
1333 /*
1334 * Extract IP address from the parameter string if needed. Note that we
1335 * need to have root_server_addr set _before_ IPConfig gets called as it
1336 * can override it.
1337 */
1338 __be32 __init root_nfs_parse_addr(char *name)
1339 {
1340 __be32 addr;
1341 int octets = 0;
1342 char *cp, *cq;
1343
1344 cp = cq = name;
1345 while (octets < 4) {
1346 while (*cp >= '0' && *cp <= '9')
1347 cp++;
1348 if (cp == cq || cp - cq > 3)
1349 break;
1350 if (*cp == '.' || octets == 3)
1351 octets++;
1352 if (octets < 4)
1353 cp++;
1354 cq = cp;
1355 }
1356 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1357 if (*cp == ':')
1358 *cp++ = '\0';
1359 addr = in_aton(name);
1360 memmove(name, cp, strlen(cp) + 1);
1361 } else
1362 addr = NONE;
1363
1364 return addr;
1365 }
1366
1367 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1368
1369 static int __init wait_for_devices(void)
1370 {
1371 int i;
1372
1373 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1374 struct net_device *dev;
1375 int found = 0;
1376
1377 rtnl_lock();
1378 for_each_netdev(&init_net, dev) {
1379 if (ic_is_init_dev(dev)) {
1380 found = 1;
1381 break;
1382 }
1383 }
1384 rtnl_unlock();
1385 if (found)
1386 return 0;
1387 ssleep(1);
1388 }
1389 return -ENODEV;
1390 }
1391
1392 /*
1393 * IP Autoconfig dispatcher.
1394 */
1395
1396 static int __init ip_auto_config(void)
1397 {
1398 __be32 addr;
1399 #ifdef IPCONFIG_DYNAMIC
1400 int retries = CONF_OPEN_RETRIES;
1401 #endif
1402 int err;
1403 unsigned int i;
1404
1405 #ifdef CONFIG_PROC_FS
1406 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1407 #endif /* CONFIG_PROC_FS */
1408
1409 if (!ic_enable)
1410 return 0;
1411
1412 pr_debug("IP-Config: Entered.\n");
1413 #ifdef IPCONFIG_DYNAMIC
1414 try_try_again:
1415 #endif
1416 /* Wait for devices to appear */
1417 err = wait_for_devices();
1418 if (err)
1419 return err;
1420
1421 /* Setup all network devices */
1422 err = ic_open_devs();
1423 if (err)
1424 return err;
1425
1426 /* Give drivers a chance to settle */
1427 msleep(CONF_POST_OPEN);
1428
1429 /*
1430 * If the config information is insufficient (e.g., our IP address or
1431 * IP address of the boot server is missing or we have multiple network
1432 * interfaces and no default was set), use BOOTP or RARP to get the
1433 * missing values.
1434 */
1435 if (ic_myaddr == NONE ||
1436 #ifdef CONFIG_ROOT_NFS
1437 (root_server_addr == NONE &&
1438 ic_servaddr == NONE &&
1439 ROOT_DEV == Root_NFS) ||
1440 #endif
1441 ic_first_dev->next) {
1442 #ifdef IPCONFIG_DYNAMIC
1443 if (ic_dynamic() < 0) {
1444 ic_close_devs();
1445
1446 /*
1447 * I don't know why, but sometimes the
1448 * eepro100 driver (at least) gets upset and
1449 * doesn't work the first time it's opened.
1450 * But then if you close it and reopen it, it
1451 * works just fine. So we need to try that at
1452 * least once before giving up.
1453 *
1454 * Also, if the root will be NFS-mounted, we
1455 * have nowhere to go if DHCP fails. So we
1456 * just have to keep trying forever.
1457 *
1458 * -- Chip
1459 */
1460 #ifdef CONFIG_ROOT_NFS
1461 if (ROOT_DEV == Root_NFS) {
1462 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1463 goto try_try_again;
1464 }
1465 #endif
1466
1467 if (--retries) {
1468 pr_err("IP-Config: Reopening network devices...\n");
1469 goto try_try_again;
1470 }
1471
1472 /* Oh, well. At least we tried. */
1473 pr_err("IP-Config: Auto-configuration of network failed\n");
1474 return -1;
1475 }
1476 #else /* !DYNAMIC */
1477 pr_err("IP-Config: Incomplete network configuration information\n");
1478 ic_close_devs();
1479 return -1;
1480 #endif /* IPCONFIG_DYNAMIC */
1481 } else {
1482 /* Device selected manually or only one device -> use it */
1483 ic_dev = ic_first_dev;
1484 }
1485
1486 addr = root_nfs_parse_addr(root_server_path);
1487 if (root_server_addr == NONE)
1488 root_server_addr = addr;
1489
1490 /*
1491 * Use defaults wherever applicable.
1492 */
1493 if (ic_defaults() < 0)
1494 return -1;
1495
1496 /*
1497 * Record which protocol was actually used.
1498 */
1499 #ifdef IPCONFIG_DYNAMIC
1500 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1501 #endif
1502
1503 #ifndef IPCONFIG_SILENT
1504 /*
1505 * Clue in the operator.
1506 */
1507 pr_info("IP-Config: Complete:\n");
1508
1509 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1510 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1511 &ic_myaddr, &ic_netmask, &ic_gateway);
1512 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1513 utsname()->nodename, ic_domain, utsname()->domainname);
1514 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1515 &ic_servaddr, &root_server_addr, root_server_path);
1516 if (ic_dev_mtu)
1517 pr_cont(", mtu=%d", ic_dev_mtu);
1518 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1519 if (ic_nameservers[i] != NONE) {
1520 pr_cont(" nameserver%u=%pI4",
1521 i, &ic_nameservers[i]);
1522 break;
1523 }
1524 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1525 if (ic_nameservers[i] != NONE)
1526 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1527 pr_cont("\n");
1528 #endif /* !SILENT */
1529
1530 /*
1531 * Close all network devices except the device we've
1532 * autoconfigured and set up routes.
1533 */
1534 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1535 err = -1;
1536 else
1537 err = 0;
1538
1539 ic_close_devs();
1540
1541 return err;
1542 }
1543
1544 late_initcall(ip_auto_config);
1545
1546
1547 /*
1548 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1549 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1550 */
1551 static int __init ic_proto_name(char *name)
1552 {
1553 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1554 return 1;
1555 }
1556 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1557 return 0;
1558 }
1559 #ifdef CONFIG_IP_PNP_DHCP
1560 else if (!strncmp(name, "dhcp", 4)) {
1561 char *client_id;
1562
1563 ic_proto_enabled &= ~IC_RARP;
1564 client_id = strstr(name, "dhcp,");
1565 if (client_id) {
1566 char *v;
1567
1568 client_id = client_id + 5;
1569 v = strchr(client_id, ',');
1570 if (!v)
1571 return 1;
1572 *v = 0;
1573 if (kstrtou8(client_id, 0, dhcp_client_identifier))
1574 pr_debug("DHCP: Invalid client identifier type\n");
1575 strncpy(dhcp_client_identifier + 1, v + 1, 251);
1576 *v = ',';
1577 }
1578 return 1;
1579 }
1580 #endif
1581 #ifdef CONFIG_IP_PNP_BOOTP
1582 else if (!strcmp(name, "bootp")) {
1583 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1584 return 1;
1585 }
1586 #endif
1587 #ifdef CONFIG_IP_PNP_RARP
1588 else if (!strcmp(name, "rarp")) {
1589 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1590 return 1;
1591 }
1592 #endif
1593 #ifdef IPCONFIG_DYNAMIC
1594 else if (!strcmp(name, "both")) {
1595 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1596 return 1;
1597 }
1598 #endif
1599 return 0;
1600 }
1601
1602 static int __init ip_auto_config_setup(char *addrs)
1603 {
1604 char *cp, *ip, *dp;
1605 int num = 0;
1606
1607 ic_set_manually = 1;
1608 ic_enable = 1;
1609
1610 /*
1611 * If any dhcp, bootp etc options are set, leave autoconfig on
1612 * and skip the below static IP processing.
1613 */
1614 if (ic_proto_name(addrs))
1615 return 1;
1616
1617 /* If no static IP is given, turn off autoconfig and bail. */
1618 if (*addrs == 0 ||
1619 strcmp(addrs, "off") == 0 ||
1620 strcmp(addrs, "none") == 0) {
1621 ic_enable = 0;
1622 return 1;
1623 }
1624
1625 ic_nameservers_predef();
1626
1627 /* Parse string for static IP assignment. */
1628 ip = addrs;
1629 while (ip && *ip) {
1630 if ((cp = strchr(ip, ':')))
1631 *cp++ = '\0';
1632 if (strlen(ip) > 0) {
1633 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1634 switch (num) {
1635 case 0:
1636 if ((ic_myaddr = in_aton(ip)) == ANY)
1637 ic_myaddr = NONE;
1638 break;
1639 case 1:
1640 if ((ic_servaddr = in_aton(ip)) == ANY)
1641 ic_servaddr = NONE;
1642 break;
1643 case 2:
1644 if ((ic_gateway = in_aton(ip)) == ANY)
1645 ic_gateway = NONE;
1646 break;
1647 case 3:
1648 if ((ic_netmask = in_aton(ip)) == ANY)
1649 ic_netmask = NONE;
1650 break;
1651 case 4:
1652 if ((dp = strchr(ip, '.'))) {
1653 *dp++ = '\0';
1654 strlcpy(utsname()->domainname, dp,
1655 sizeof(utsname()->domainname));
1656 }
1657 strlcpy(utsname()->nodename, ip,
1658 sizeof(utsname()->nodename));
1659 ic_host_name_set = 1;
1660 break;
1661 case 5:
1662 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1663 break;
1664 case 6:
1665 if (ic_proto_name(ip) == 0 &&
1666 ic_myaddr == NONE) {
1667 ic_enable = 0;
1668 }
1669 break;
1670 case 7:
1671 if (CONF_NAMESERVERS_MAX >= 1) {
1672 ic_nameservers[0] = in_aton(ip);
1673 if (ic_nameservers[0] == ANY)
1674 ic_nameservers[0] = NONE;
1675 }
1676 break;
1677 case 8:
1678 if (CONF_NAMESERVERS_MAX >= 2) {
1679 ic_nameservers[1] = in_aton(ip);
1680 if (ic_nameservers[1] == ANY)
1681 ic_nameservers[1] = NONE;
1682 }
1683 break;
1684 }
1685 }
1686 ip = cp;
1687 num++;
1688 }
1689
1690 return 1;
1691 }
1692 __setup("ip=", ip_auto_config_setup);
1693
1694 static int __init nfsaddrs_config_setup(char *addrs)
1695 {
1696 return ip_auto_config_setup(addrs);
1697 }
1698 __setup("nfsaddrs=", nfsaddrs_config_setup);
1699
1700 static int __init vendor_class_identifier_setup(char *addrs)
1701 {
1702 if (strlcpy(vendor_class_identifier, addrs,
1703 sizeof(vendor_class_identifier))
1704 >= sizeof(vendor_class_identifier))
1705 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1706 vendor_class_identifier);
1707 return 1;
1708 }
1709 __setup("dhcpclass=", vendor_class_identifier_setup);
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