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 * NTP servers in /proc/net/ipconfig/ntp_servers
33 * -- Chris Novakovic <chris@chrisn.me.uk>, April 2018
34 */
35
36#include <linux/types.h>
37#include <linux/string.h>
38#include <linux/kernel.h>
39#include <linux/jiffies.h>
40#include <linux/random.h>
41#include <linux/init.h>
42#include <linux/utsname.h>
43#include <linux/in.h>
44#include <linux/if.h>
45#include <linux/inet.h>
46#include <linux/inetdevice.h>
47#include <linux/netdevice.h>
48#include <linux/if_arp.h>
49#include <linux/skbuff.h>
50#include <linux/ip.h>
51#include <linux/socket.h>
52#include <linux/route.h>
53#include <linux/udp.h>
54#include <linux/proc_fs.h>
55#include <linux/seq_file.h>
56#include <linux/major.h>
57#include <linux/root_dev.h>
58#include <linux/delay.h>
59#include <linux/nfs_fs.h>
60#include <linux/slab.h>
61#include <linux/export.h>
62#include <net/net_namespace.h>
63#include <net/arp.h>
64#include <net/dsa.h>
65#include <net/ip.h>
66#include <net/ipconfig.h>
67#include <net/route.h>
68
69#include <linux/uaccess.h>
70#include <net/checksum.h>
71#include <asm/processor.h>
72
73#if defined(CONFIG_IP_PNP_DHCP)
74#define IPCONFIG_DHCP
75#endif
76#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
77#define IPCONFIG_BOOTP
78#endif
79#if defined(CONFIG_IP_PNP_RARP)
80#define IPCONFIG_RARP
81#endif
82#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
83#define IPCONFIG_DYNAMIC
84#endif
85
86/* Define the friendly delay before and after opening net devices */
87#define CONF_POST_OPEN 10 /* After opening: 10 msecs */
88#define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
89
90/* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
91#define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
92#define CONF_SEND_RETRIES 6 /* Send six requests per open */
93#define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
94#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
95#define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
96#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
97#define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
98 - '3' from resolv.h */
99#define CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */
100
101#define NONE cpu_to_be32(INADDR_NONE)
102#define ANY cpu_to_be32(INADDR_ANY)
103
104/*
105 * Public IP configuration
106 */
107
108/* This is used by platforms which might be able to set the ipconfig
109 * variables using firmware environment vars. If this is set, it will
110 * ignore such firmware variables.
111 */
112int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
113
114static int ic_enable __initdata; /* IP config enabled? */
115
116/* Protocol choice */
117int ic_proto_enabled __initdata = 0
118#ifdef IPCONFIG_BOOTP
119 | IC_BOOTP
120#endif
121#ifdef CONFIG_IP_PNP_DHCP
122 | IC_USE_DHCP
123#endif
124#ifdef IPCONFIG_RARP
125 | IC_RARP
126#endif
127 ;
128
129static int ic_host_name_set __initdata; /* Host name set by us? */
130
131__be32 ic_myaddr = NONE; /* My IP address */
132static __be32 ic_netmask = NONE; /* Netmask for local subnet */
133__be32 ic_gateway = NONE; /* Gateway IP address */
134
135#ifdef IPCONFIG_DYNAMIC
136static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */
137#endif
138
139__be32 ic_servaddr = NONE; /* Boot server IP address */
140
141__be32 root_server_addr = NONE; /* Address of NFS server */
142u8 root_server_path[256] = { 0, }; /* Path to mount as root */
143
144/* vendor class identifier */
145static char vendor_class_identifier[253] __initdata;
146
147#if defined(CONFIG_IP_PNP_DHCP)
148static char dhcp_client_identifier[253] __initdata;
149#endif
150
151/* Persistent data: */
152
153#ifdef IPCONFIG_DYNAMIC
154static int ic_proto_used; /* Protocol used, if any */
155#else
156#define ic_proto_used 0
157#endif
158static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
159static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */
160static u8 ic_domain[64]; /* DNS (not NIS) domain name */
161
162/*
163 * Private state.
164 */
165
166/* Name of user-selected boot device */
167static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
168
169/* Protocols supported by available interfaces */
170static int ic_proto_have_if __initdata;
171
172/* MTU for boot device */
173static int ic_dev_mtu __initdata;
174
175#ifdef IPCONFIG_DYNAMIC
176static DEFINE_SPINLOCK(ic_recv_lock);
177static volatile int ic_got_reply __initdata; /* Proto(s) that replied */
178#endif
179#ifdef IPCONFIG_DHCP
180static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */
181#endif
182
183
184/*
185 * Network devices
186 */
187
188struct ic_device {
189 struct ic_device *next;
190 struct net_device *dev;
191 unsigned short flags;
192 short able;
193 __be32 xid;
194};
195
196static struct ic_device *ic_first_dev __initdata; /* List of open device */
197static struct ic_device *ic_dev __initdata; /* Selected device */
198
199static bool __init ic_is_init_dev(struct net_device *dev)
200{
201 if (dev->flags & IFF_LOOPBACK)
202 return false;
203 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
204 (!(dev->flags & IFF_LOOPBACK) &&
205 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
206 strncmp(dev->name, "dummy", 5));
207}
208
209static int __init ic_open_devs(void)
210{
211 struct ic_device *d, **last;
212 struct net_device *dev;
213 unsigned short oflags;
214 unsigned long start, next_msg;
215
216 last = &ic_first_dev;
217 rtnl_lock();
218
219 /* bring loopback and DSA master network devices up first */
220 for_each_netdev(&init_net, dev) {
221 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
222 continue;
223 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
224 pr_err("IP-Config: Failed to open %s\n", dev->name);
225 }
226
227 for_each_netdev(&init_net, dev) {
228 if (ic_is_init_dev(dev)) {
229 int able = 0;
230 if (dev->mtu >= 364)
231 able |= IC_BOOTP;
232 else
233 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
234 dev->name, dev->mtu);
235 if (!(dev->flags & IFF_NOARP))
236 able |= IC_RARP;
237 able &= ic_proto_enabled;
238 if (ic_proto_enabled && !able)
239 continue;
240 oflags = dev->flags;
241 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
242 pr_err("IP-Config: Failed to open %s\n",
243 dev->name);
244 continue;
245 }
246 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
247 rtnl_unlock();
248 return -ENOMEM;
249 }
250 d->dev = dev;
251 *last = d;
252 last = &d->next;
253 d->flags = oflags;
254 d->able = able;
255 if (able & IC_BOOTP)
256 get_random_bytes(&d->xid, sizeof(__be32));
257 else
258 d->xid = 0;
259 ic_proto_have_if |= able;
260 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
261 dev->name, able, d->xid);
262 }
263 }
264
265 /* no point in waiting if we could not bring up at least one device */
266 if (!ic_first_dev)
267 goto have_carrier;
268
269 /* wait for a carrier on at least one device */
270 start = jiffies;
271 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
272 while (time_before(jiffies, start +
273 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
274 int wait, elapsed;
275
276 for_each_netdev(&init_net, dev)
277 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
278 goto have_carrier;
279
280 msleep(1);
281
282 if (time_before(jiffies, next_msg))
283 continue;
284
285 elapsed = jiffies_to_msecs(jiffies - start);
286 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
287 pr_info("Waiting up to %d more seconds for network.\n", wait);
288 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
289 }
290have_carrier:
291 rtnl_unlock();
292
293 *last = NULL;
294
295 if (!ic_first_dev) {
296 if (user_dev_name[0])
297 pr_err("IP-Config: Device `%s' not found\n",
298 user_dev_name);
299 else
300 pr_err("IP-Config: No network devices available\n");
301 return -ENODEV;
302 }
303 return 0;
304}
305
306static void __init ic_close_devs(void)
307{
308 struct ic_device *d, *next;
309 struct net_device *dev;
310
311 rtnl_lock();
312 next = ic_first_dev;
313 while ((d = next)) {
314 next = d->next;
315 dev = d->dev;
316 if (d != ic_dev && !netdev_uses_dsa(dev)) {
317 pr_debug("IP-Config: Downing %s\n", dev->name);
318 dev_change_flags(dev, d->flags);
319 }
320 kfree(d);
321 }
322 rtnl_unlock();
323}
324
325/*
326 * Interface to various network functions.
327 */
328
329static inline void
330set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
331{
332 sin->sin_family = AF_INET;
333 sin->sin_addr.s_addr = addr;
334 sin->sin_port = port;
335}
336
337/*
338 * Set up interface addresses and routes.
339 */
340
341static int __init ic_setup_if(void)
342{
343 struct ifreq ir;
344 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
345 int err;
346
347 memset(&ir, 0, sizeof(ir));
348 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name);
349 set_sockaddr(sin, ic_myaddr, 0);
350 if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) {
351 pr_err("IP-Config: Unable to set interface address (%d)\n",
352 err);
353 return -1;
354 }
355 set_sockaddr(sin, ic_netmask, 0);
356 if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) {
357 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
358 err);
359 return -1;
360 }
361 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
362 if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) {
363 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
364 err);
365 return -1;
366 }
367 /* Handle the case where we need non-standard MTU on the boot link (a network
368 * using jumbo frames, for instance). If we can't set the mtu, don't error
369 * out, we'll try to muddle along.
370 */
371 if (ic_dev_mtu != 0) {
372 rtnl_lock();
373 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0)
374 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
375 ic_dev_mtu, err);
376 rtnl_unlock();
377 }
378 return 0;
379}
380
381static int __init ic_setup_routes(void)
382{
383 /* No need to setup device routes, only the default route... */
384
385 if (ic_gateway != NONE) {
386 struct rtentry rm;
387 int err;
388
389 memset(&rm, 0, sizeof(rm));
390 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
391 pr_err("IP-Config: Gateway not on directly connected network\n");
392 return -1;
393 }
394 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
395 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
396 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
397 rm.rt_flags = RTF_UP | RTF_GATEWAY;
398 if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) {
399 pr_err("IP-Config: Cannot add default route (%d)\n",
400 err);
401 return -1;
402 }
403 }
404
405 return 0;
406}
407
408/*
409 * Fill in default values for all missing parameters.
410 */
411
412static int __init ic_defaults(void)
413{
414 /*
415 * At this point we have no userspace running so need not
416 * claim locks on system_utsname
417 */
418
419 if (!ic_host_name_set)
420 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
421
422 if (root_server_addr == NONE)
423 root_server_addr = ic_servaddr;
424
425 if (ic_netmask == NONE) {
426 if (IN_CLASSA(ntohl(ic_myaddr)))
427 ic_netmask = htonl(IN_CLASSA_NET);
428 else if (IN_CLASSB(ntohl(ic_myaddr)))
429 ic_netmask = htonl(IN_CLASSB_NET);
430 else if (IN_CLASSC(ntohl(ic_myaddr)))
431 ic_netmask = htonl(IN_CLASSC_NET);
432 else {
433 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
434 &ic_myaddr);
435 return -1;
436 }
437 pr_notice("IP-Config: Guessing netmask %pI4\n",
438 &ic_netmask);
439 }
440
441 return 0;
442}
443
444/*
445 * RARP support.
446 */
447
448#ifdef IPCONFIG_RARP
449
450static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
451
452static struct packet_type rarp_packet_type __initdata = {
453 .type = cpu_to_be16(ETH_P_RARP),
454 .func = ic_rarp_recv,
455};
456
457static inline void __init ic_rarp_init(void)
458{
459 dev_add_pack(&rarp_packet_type);
460}
461
462static inline void __init ic_rarp_cleanup(void)
463{
464 dev_remove_pack(&rarp_packet_type);
465}
466
467/*
468 * Process received RARP packet.
469 */
470static int __init
471ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
472{
473 struct arphdr *rarp;
474 unsigned char *rarp_ptr;
475 __be32 sip, tip;
476 unsigned char *tha; /* t for "target" */
477 struct ic_device *d;
478
479 if (!net_eq(dev_net(dev), &init_net))
480 goto drop;
481
482 skb = skb_share_check(skb, GFP_ATOMIC);
483 if (!skb)
484 return NET_RX_DROP;
485
486 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
487 goto drop;
488
489 /* Basic sanity checks can be done without the lock. */
490 rarp = (struct arphdr *)skb_transport_header(skb);
491
492 /* If this test doesn't pass, it's not IP, or we should
493 * ignore it anyway.
494 */
495 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
496 goto drop;
497
498 /* If it's not a RARP reply, delete it. */
499 if (rarp->ar_op != htons(ARPOP_RREPLY))
500 goto drop;
501
502 /* If it's not Ethernet, delete it. */
503 if (rarp->ar_pro != htons(ETH_P_IP))
504 goto drop;
505
506 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
507 goto drop;
508
509 /* OK, it is all there and looks valid, process... */
510 rarp = (struct arphdr *)skb_transport_header(skb);
511 rarp_ptr = (unsigned char *) (rarp + 1);
512
513 /* One reply at a time, please. */
514 spin_lock(&ic_recv_lock);
515
516 /* If we already have a reply, just drop the packet */
517 if (ic_got_reply)
518 goto drop_unlock;
519
520 /* Find the ic_device that the packet arrived on */
521 d = ic_first_dev;
522 while (d && d->dev != dev)
523 d = d->next;
524 if (!d)
525 goto drop_unlock; /* should never happen */
526
527 /* Extract variable-width fields */
528 rarp_ptr += dev->addr_len;
529 memcpy(&sip, rarp_ptr, 4);
530 rarp_ptr += 4;
531 tha = rarp_ptr;
532 rarp_ptr += dev->addr_len;
533 memcpy(&tip, rarp_ptr, 4);
534
535 /* Discard packets which are not meant for us. */
536 if (memcmp(tha, dev->dev_addr, dev->addr_len))
537 goto drop_unlock;
538
539 /* Discard packets which are not from specified server. */
540 if (ic_servaddr != NONE && ic_servaddr != sip)
541 goto drop_unlock;
542
543 /* We have a winner! */
544 ic_dev = d;
545 if (ic_myaddr == NONE)
546 ic_myaddr = tip;
547 ic_servaddr = sip;
548 ic_addrservaddr = sip;
549 ic_got_reply = IC_RARP;
550
551drop_unlock:
552 /* Show's over. Nothing to see here. */
553 spin_unlock(&ic_recv_lock);
554
555drop:
556 /* Throw the packet out. */
557 kfree_skb(skb);
558 return 0;
559}
560
561
562/*
563 * Send RARP request packet over a single interface.
564 */
565static void __init ic_rarp_send_if(struct ic_device *d)
566{
567 struct net_device *dev = d->dev;
568 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
569 dev->dev_addr, dev->dev_addr);
570}
571#endif
572
573/*
574 * Predefine Nameservers
575 */
576static inline void __init ic_nameservers_predef(void)
577{
578 int i;
579
580 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
581 ic_nameservers[i] = NONE;
582}
583
584/* Predefine NTP servers */
585static inline void __init ic_ntp_servers_predef(void)
586{
587 int i;
588
589 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++)
590 ic_ntp_servers[i] = NONE;
591}
592
593/*
594 * DHCP/BOOTP support.
595 */
596
597#ifdef IPCONFIG_BOOTP
598
599struct bootp_pkt { /* BOOTP packet format */
600 struct iphdr iph; /* IP header */
601 struct udphdr udph; /* UDP header */
602 u8 op; /* 1=request, 2=reply */
603 u8 htype; /* HW address type */
604 u8 hlen; /* HW address length */
605 u8 hops; /* Used only by gateways */
606 __be32 xid; /* Transaction ID */
607 __be16 secs; /* Seconds since we started */
608 __be16 flags; /* Just what it says */
609 __be32 client_ip; /* Client's IP address if known */
610 __be32 your_ip; /* Assigned IP address */
611 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
612 __be32 relay_ip; /* IP address of BOOTP relay */
613 u8 hw_addr[16]; /* Client's HW address */
614 u8 serv_name[64]; /* Server host name */
615 u8 boot_file[128]; /* Name of boot file */
616 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
617};
618
619/* packet ops */
620#define BOOTP_REQUEST 1
621#define BOOTP_REPLY 2
622
623/* DHCP message types */
624#define DHCPDISCOVER 1
625#define DHCPOFFER 2
626#define DHCPREQUEST 3
627#define DHCPDECLINE 4
628#define DHCPACK 5
629#define DHCPNAK 6
630#define DHCPRELEASE 7
631#define DHCPINFORM 8
632
633static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
634
635static struct packet_type bootp_packet_type __initdata = {
636 .type = cpu_to_be16(ETH_P_IP),
637 .func = ic_bootp_recv,
638};
639
640/*
641 * Initialize DHCP/BOOTP extension fields in the request.
642 */
643
644static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
645
646#ifdef IPCONFIG_DHCP
647
648static void __init
649ic_dhcp_init_options(u8 *options, struct ic_device *d)
650{
651 u8 mt = ((ic_servaddr == NONE)
652 ? DHCPDISCOVER : DHCPREQUEST);
653 u8 *e = options;
654 int len;
655
656 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);
657
658 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
659 e += 4;
660
661 *e++ = 53; /* DHCP message type */
662 *e++ = 1;
663 *e++ = mt;
664
665 if (mt == DHCPREQUEST) {
666 *e++ = 54; /* Server ID (IP address) */
667 *e++ = 4;
668 memcpy(e, &ic_servaddr, 4);
669 e += 4;
670
671 *e++ = 50; /* Requested IP address */
672 *e++ = 4;
673 memcpy(e, &ic_myaddr, 4);
674 e += 4;
675 }
676
677 /* always? */
678 {
679 static const u8 ic_req_params[] = {
680 1, /* Subnet mask */
681 3, /* Default gateway */
682 6, /* DNS server */
683 12, /* Host name */
684 15, /* Domain name */
685 17, /* Boot path */
686 26, /* MTU */
687 40, /* NIS domain name */
688 42, /* NTP servers */
689 };
690
691 *e++ = 55; /* Parameter request list */
692 *e++ = sizeof(ic_req_params);
693 memcpy(e, ic_req_params, sizeof(ic_req_params));
694 e += sizeof(ic_req_params);
695
696 if (ic_host_name_set) {
697 *e++ = 12; /* host-name */
698 len = strlen(utsname()->nodename);
699 *e++ = len;
700 memcpy(e, utsname()->nodename, len);
701 e += len;
702 }
703 if (*vendor_class_identifier) {
704 pr_info("DHCP: sending class identifier \"%s\"\n",
705 vendor_class_identifier);
706 *e++ = 60; /* Class-identifier */
707 len = strlen(vendor_class_identifier);
708 *e++ = len;
709 memcpy(e, vendor_class_identifier, len);
710 e += len;
711 }
712 len = strlen(dhcp_client_identifier + 1);
713 /* the minimum length of identifier is 2, include 1 byte type,
714 * and can not be larger than the length of options
715 */
716 if (len >= 1 && len < 312 - (e - options) - 1) {
717 *e++ = 61;
718 *e++ = len + 1;
719 memcpy(e, dhcp_client_identifier, len + 1);
720 e += len + 1;
721 }
722 }
723
724 *e++ = 255; /* End of the list */
725}
726
727#endif /* IPCONFIG_DHCP */
728
729static void __init ic_bootp_init_ext(u8 *e)
730{
731 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
732 e += 4;
733 *e++ = 1; /* Subnet mask request */
734 *e++ = 4;
735 e += 4;
736 *e++ = 3; /* Default gateway request */
737 *e++ = 4;
738 e += 4;
739#if CONF_NAMESERVERS_MAX > 0
740 *e++ = 6; /* (DNS) name server request */
741 *e++ = 4 * CONF_NAMESERVERS_MAX;
742 e += 4 * CONF_NAMESERVERS_MAX;
743#endif
744 *e++ = 12; /* Host name request */
745 *e++ = 32;
746 e += 32;
747 *e++ = 40; /* NIS Domain name request */
748 *e++ = 32;
749 e += 32;
750 *e++ = 17; /* Boot path */
751 *e++ = 40;
752 e += 40;
753
754 *e++ = 57; /* set extension buffer size for reply */
755 *e++ = 2;
756 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
757 *e++ = 150;
758
759 *e++ = 255; /* End of the list */
760}
761
762
763/*
764 * Initialize the DHCP/BOOTP mechanism.
765 */
766static inline void __init ic_bootp_init(void)
767{
768 /* Re-initialise all name servers and NTP servers to NONE, in case any
769 * were set via the "ip=" or "nfsaddrs=" kernel command line parameters:
770 * any IP addresses specified there will already have been decoded but
771 * are no longer needed
772 */
773 ic_nameservers_predef();
774 ic_ntp_servers_predef();
775
776 dev_add_pack(&bootp_packet_type);
777}
778
779
780/*
781 * DHCP/BOOTP cleanup.
782 */
783static inline void __init ic_bootp_cleanup(void)
784{
785 dev_remove_pack(&bootp_packet_type);
786}
787
788
789/*
790 * Send DHCP/BOOTP request to single interface.
791 */
792static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
793{
794 struct net_device *dev = d->dev;
795 struct sk_buff *skb;
796 struct bootp_pkt *b;
797 struct iphdr *h;
798 int hlen = LL_RESERVED_SPACE(dev);
799 int tlen = dev->needed_tailroom;
800
801 /* Allocate packet */
802 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
803 GFP_KERNEL);
804 if (!skb)
805 return;
806 skb_reserve(skb, hlen);
807 b = skb_put_zero(skb, sizeof(struct bootp_pkt));
808
809 /* Construct IP header */
810 skb_reset_network_header(skb);
811 h = ip_hdr(skb);
812 h->version = 4;
813 h->ihl = 5;
814 h->tot_len = htons(sizeof(struct bootp_pkt));
815 h->frag_off = htons(IP_DF);
816 h->ttl = 64;
817 h->protocol = IPPROTO_UDP;
818 h->daddr = htonl(INADDR_BROADCAST);
819 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
820
821 /* Construct UDP header */
822 b->udph.source = htons(68);
823 b->udph.dest = htons(67);
824 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
825 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
826
827 /* Construct DHCP/BOOTP header */
828 b->op = BOOTP_REQUEST;
829 if (dev->type < 256) /* check for false types */
830 b->htype = dev->type;
831 else if (dev->type == ARPHRD_FDDI)
832 b->htype = ARPHRD_ETHER;
833 else {
834 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
835 dev->name);
836 b->htype = dev->type; /* can cause undefined behavior */
837 }
838
839 /* server_ip and your_ip address are both already zero per RFC2131 */
840 b->hlen = dev->addr_len;
841 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
842 b->secs = htons(jiffies_diff / HZ);
843 b->xid = d->xid;
844
845 /* add DHCP options or BOOTP extensions */
846#ifdef IPCONFIG_DHCP
847 if (ic_proto_enabled & IC_USE_DHCP)
848 ic_dhcp_init_options(b->exten, d);
849 else
850#endif
851 ic_bootp_init_ext(b->exten);
852
853 /* Chain packet down the line... */
854 skb->dev = dev;
855 skb->protocol = htons(ETH_P_IP);
856 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
857 dev->broadcast, dev->dev_addr, skb->len) < 0) {
858 kfree_skb(skb);
859 printk("E");
860 return;
861 }
862
863 if (dev_queue_xmit(skb) < 0)
864 printk("E");
865}
866
867
868/*
869 * Copy BOOTP-supplied string if not already set.
870 */
871static int __init ic_bootp_string(char *dest, char *src, int len, int max)
872{
873 if (!len)
874 return 0;
875 if (len > max-1)
876 len = max-1;
877 memcpy(dest, src, len);
878 dest[len] = '\0';
879 return 1;
880}
881
882
883/*
884 * Process BOOTP extensions.
885 */
886static void __init ic_do_bootp_ext(u8 *ext)
887{
888 u8 servers;
889 int i;
890 __be16 mtu;
891
892 u8 *c;
893
894 pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
895 for (c=ext+2; c<ext+2+ext[1]; c++)
896 pr_debug(" %02x", *c);
897 pr_debug("\n");
898
899 switch (*ext++) {
900 case 1: /* Subnet mask */
901 if (ic_netmask == NONE)
902 memcpy(&ic_netmask, ext+1, 4);
903 break;
904 case 3: /* Default gateway */
905 if (ic_gateway == NONE)
906 memcpy(&ic_gateway, ext+1, 4);
907 break;
908 case 6: /* DNS server */
909 servers= *ext/4;
910 if (servers > CONF_NAMESERVERS_MAX)
911 servers = CONF_NAMESERVERS_MAX;
912 for (i = 0; i < servers; i++) {
913 if (ic_nameservers[i] == NONE)
914 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
915 }
916 break;
917 case 12: /* Host name */
918 ic_bootp_string(utsname()->nodename, ext+1, *ext,
919 __NEW_UTS_LEN);
920 ic_host_name_set = 1;
921 break;
922 case 15: /* Domain name (DNS) */
923 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
924 break;
925 case 17: /* Root path */
926 if (!root_server_path[0])
927 ic_bootp_string(root_server_path, ext+1, *ext,
928 sizeof(root_server_path));
929 break;
930 case 26: /* Interface MTU */
931 memcpy(&mtu, ext+1, sizeof(mtu));
932 ic_dev_mtu = ntohs(mtu);
933 break;
934 case 40: /* NIS Domain name (_not_ DNS) */
935 ic_bootp_string(utsname()->domainname, ext+1, *ext,
936 __NEW_UTS_LEN);
937 break;
938 case 42: /* NTP servers */
939 servers = *ext / 4;
940 if (servers > CONF_NTP_SERVERS_MAX)
941 servers = CONF_NTP_SERVERS_MAX;
942 for (i = 0; i < servers; i++) {
943 if (ic_ntp_servers[i] == NONE)
944 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4);
945 }
946 break;
947 }
948}
949
950
951/*
952 * Receive BOOTP reply.
953 */
954static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
955{
956 struct bootp_pkt *b;
957 struct iphdr *h;
958 struct ic_device *d;
959 int len, ext_len;
960
961 if (!net_eq(dev_net(dev), &init_net))
962 goto drop;
963
964 /* Perform verifications before taking the lock. */
965 if (skb->pkt_type == PACKET_OTHERHOST)
966 goto drop;
967
968 skb = skb_share_check(skb, GFP_ATOMIC);
969 if (!skb)
970 return NET_RX_DROP;
971
972 if (!pskb_may_pull(skb,
973 sizeof(struct iphdr) +
974 sizeof(struct udphdr)))
975 goto drop;
976
977 b = (struct bootp_pkt *)skb_network_header(skb);
978 h = &b->iph;
979
980 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
981 goto drop;
982
983 /* Fragments are not supported */
984 if (ip_is_fragment(h)) {
985 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
986 goto drop;
987 }
988
989 if (skb->len < ntohs(h->tot_len))
990 goto drop;
991
992 if (ip_fast_csum((char *) h, h->ihl))
993 goto drop;
994
995 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
996 goto drop;
997
998 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
999 goto drop;
1000
1001 len = ntohs(b->udph.len) - sizeof(struct udphdr);
1002 ext_len = len - (sizeof(*b) -
1003 sizeof(struct iphdr) -
1004 sizeof(struct udphdr) -
1005 sizeof(b->exten));
1006 if (ext_len < 0)
1007 goto drop;
1008
1009 /* Ok the front looks good, make sure we can get at the rest. */
1010 if (!pskb_may_pull(skb, skb->len))
1011 goto drop;
1012
1013 b = (struct bootp_pkt *)skb_network_header(skb);
1014 h = &b->iph;
1015
1016 /* One reply at a time, please. */
1017 spin_lock(&ic_recv_lock);
1018
1019 /* If we already have a reply, just drop the packet */
1020 if (ic_got_reply)
1021 goto drop_unlock;
1022
1023 /* Find the ic_device that the packet arrived on */
1024 d = ic_first_dev;
1025 while (d && d->dev != dev)
1026 d = d->next;
1027 if (!d)
1028 goto drop_unlock; /* should never happen */
1029
1030 /* Is it a reply to our BOOTP request? */
1031 if (b->op != BOOTP_REPLY ||
1032 b->xid != d->xid) {
1033 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1034 d->dev->name, b->op, b->xid);
1035 goto drop_unlock;
1036 }
1037
1038 /* Parse extensions */
1039 if (ext_len >= 4 &&
1040 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1041 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1042 u8 *ext;
1043
1044#ifdef IPCONFIG_DHCP
1045 if (ic_proto_enabled & IC_USE_DHCP) {
1046 __be32 server_id = NONE;
1047 int mt = 0;
1048
1049 ext = &b->exten[4];
1050 while (ext < end && *ext != 0xff) {
1051 u8 *opt = ext++;
1052 if (*opt == 0) /* Padding */
1053 continue;
1054 ext += *ext + 1;
1055 if (ext >= end)
1056 break;
1057 switch (*opt) {
1058 case 53: /* Message type */
1059 if (opt[1])
1060 mt = opt[2];
1061 break;
1062 case 54: /* Server ID (IP address) */
1063 if (opt[1] >= 4)
1064 memcpy(&server_id, opt + 2, 4);
1065 break;
1066 }
1067 }
1068
1069 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1070
1071 switch (mt) {
1072 case DHCPOFFER:
1073 /* While in the process of accepting one offer,
1074 * ignore all others.
1075 */
1076 if (ic_myaddr != NONE)
1077 goto drop_unlock;
1078
1079 /* Let's accept that offer. */
1080 ic_myaddr = b->your_ip;
1081 ic_servaddr = server_id;
1082 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1083 &ic_myaddr, &b->iph.saddr);
1084 /* The DHCP indicated server address takes
1085 * precedence over the bootp header one if
1086 * they are different.
1087 */
1088 if ((server_id != NONE) &&
1089 (b->server_ip != server_id))
1090 b->server_ip = ic_servaddr;
1091 break;
1092
1093 case DHCPACK:
1094 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1095 goto drop_unlock;
1096
1097 /* Yeah! */
1098 break;
1099
1100 default:
1101 /* Urque. Forget it*/
1102 ic_myaddr = NONE;
1103 ic_servaddr = NONE;
1104 goto drop_unlock;
1105 }
1106
1107 ic_dhcp_msgtype = mt;
1108
1109 }
1110#endif /* IPCONFIG_DHCP */
1111
1112 ext = &b->exten[4];
1113 while (ext < end && *ext != 0xff) {
1114 u8 *opt = ext++;
1115 if (*opt == 0) /* Padding */
1116 continue;
1117 ext += *ext + 1;
1118 if (ext < end)
1119 ic_do_bootp_ext(opt);
1120 }
1121 }
1122
1123 /* We have a winner! */
1124 ic_dev = d;
1125 ic_myaddr = b->your_ip;
1126 ic_servaddr = b->server_ip;
1127 ic_addrservaddr = b->iph.saddr;
1128 if (ic_gateway == NONE && b->relay_ip)
1129 ic_gateway = b->relay_ip;
1130 if (ic_nameservers[0] == NONE)
1131 ic_nameservers[0] = ic_servaddr;
1132 ic_got_reply = IC_BOOTP;
1133
1134drop_unlock:
1135 /* Show's over. Nothing to see here. */
1136 spin_unlock(&ic_recv_lock);
1137
1138drop:
1139 /* Throw the packet out. */
1140 kfree_skb(skb);
1141
1142 return 0;
1143}
1144
1145
1146#endif
1147
1148
1149/*
1150 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1151 */
1152
1153#ifdef IPCONFIG_DYNAMIC
1154
1155static int __init ic_dynamic(void)
1156{
1157 int retries;
1158 struct ic_device *d;
1159 unsigned long start_jiffies, timeout, jiff;
1160 int do_bootp = ic_proto_have_if & IC_BOOTP;
1161 int do_rarp = ic_proto_have_if & IC_RARP;
1162
1163 /*
1164 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1165 * This routine gets only called when some pieces of information
1166 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1167 */
1168 if (!ic_proto_enabled) {
1169 pr_err("IP-Config: Incomplete network configuration information\n");
1170 return -1;
1171 }
1172
1173#ifdef IPCONFIG_BOOTP
1174 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1175 pr_err("DHCP/BOOTP: No suitable device found\n");
1176#endif
1177#ifdef IPCONFIG_RARP
1178 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1179 pr_err("RARP: No suitable device found\n");
1180#endif
1181
1182 if (!ic_proto_have_if)
1183 /* Error message already printed */
1184 return -1;
1185
1186 /*
1187 * Setup protocols
1188 */
1189#ifdef IPCONFIG_BOOTP
1190 if (do_bootp)
1191 ic_bootp_init();
1192#endif
1193#ifdef IPCONFIG_RARP
1194 if (do_rarp)
1195 ic_rarp_init();
1196#endif
1197
1198 /*
1199 * Send requests and wait, until we get an answer. This loop
1200 * seems to be a terrible waste of CPU time, but actually there is
1201 * only one process running at all, so we don't need to use any
1202 * scheduler functions.
1203 * [Actually we could now, but the nothing else running note still
1204 * applies.. - AC]
1205 */
1206 pr_notice("Sending %s%s%s requests .",
1207 do_bootp
1208 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1209 (do_bootp && do_rarp) ? " and " : "",
1210 do_rarp ? "RARP" : "");
1211
1212 start_jiffies = jiffies;
1213 d = ic_first_dev;
1214 retries = CONF_SEND_RETRIES;
1215 get_random_bytes(&timeout, sizeof(timeout));
1216 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1217 for (;;) {
1218#ifdef IPCONFIG_BOOTP
1219 if (do_bootp && (d->able & IC_BOOTP))
1220 ic_bootp_send_if(d, jiffies - start_jiffies);
1221#endif
1222#ifdef IPCONFIG_RARP
1223 if (do_rarp && (d->able & IC_RARP))
1224 ic_rarp_send_if(d);
1225#endif
1226
1227 if (!d->next) {
1228 jiff = jiffies + timeout;
1229 while (time_before(jiffies, jiff) && !ic_got_reply)
1230 schedule_timeout_uninterruptible(1);
1231 }
1232#ifdef IPCONFIG_DHCP
1233 /* DHCP isn't done until we get a DHCPACK. */
1234 if ((ic_got_reply & IC_BOOTP) &&
1235 (ic_proto_enabled & IC_USE_DHCP) &&
1236 ic_dhcp_msgtype != DHCPACK) {
1237 ic_got_reply = 0;
1238 /* continue on device that got the reply */
1239 d = ic_dev;
1240 pr_cont(",");
1241 continue;
1242 }
1243#endif /* IPCONFIG_DHCP */
1244
1245 if (ic_got_reply) {
1246 pr_cont(" OK\n");
1247 break;
1248 }
1249
1250 if ((d = d->next))
1251 continue;
1252
1253 if (! --retries) {
1254 pr_cont(" timed out!\n");
1255 break;
1256 }
1257
1258 d = ic_first_dev;
1259
1260 timeout = timeout CONF_TIMEOUT_MULT;
1261 if (timeout > CONF_TIMEOUT_MAX)
1262 timeout = CONF_TIMEOUT_MAX;
1263
1264 pr_cont(".");
1265 }
1266
1267#ifdef IPCONFIG_BOOTP
1268 if (do_bootp)
1269 ic_bootp_cleanup();
1270#endif
1271#ifdef IPCONFIG_RARP
1272 if (do_rarp)
1273 ic_rarp_cleanup();
1274#endif
1275
1276 if (!ic_got_reply) {
1277 ic_myaddr = NONE;
1278 return -1;
1279 }
1280
1281 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1282 ((ic_got_reply & IC_RARP) ? "RARP"
1283 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1284 &ic_addrservaddr, &ic_myaddr);
1285
1286 return 0;
1287}
1288
1289#endif /* IPCONFIG_DYNAMIC */
1290
1291#ifdef CONFIG_PROC_FS
1292/* proc_dir_entry for /proc/net/ipconfig */
1293static struct proc_dir_entry *ipconfig_dir;
1294
1295/* Name servers: */
1296static int pnp_seq_show(struct seq_file *seq, void *v)
1297{
1298 int i;
1299
1300 if (ic_proto_used & IC_PROTO)
1301 seq_printf(seq, "#PROTO: %s\n",
1302 (ic_proto_used & IC_RARP) ? "RARP"
1303 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1304 else
1305 seq_puts(seq, "#MANUAL\n");
1306
1307 if (ic_domain[0])
1308 seq_printf(seq,
1309 "domain %s\n", ic_domain);
1310 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1311 if (ic_nameservers[i] != NONE)
1312 seq_printf(seq, "nameserver %pI4\n",
1313 &ic_nameservers[i]);
1314 }
1315 if (ic_servaddr != NONE)
1316 seq_printf(seq, "bootserver %pI4\n",
1317 &ic_servaddr);
1318 return 0;
1319}
1320
1321/* Create the /proc/net/ipconfig directory */
1322static int __init ipconfig_proc_net_init(void)
1323{
1324 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net);
1325 if (!ipconfig_dir)
1326 return -ENOMEM;
1327
1328 return 0;
1329}
1330
1331/* Create a new file under /proc/net/ipconfig */
1332static int ipconfig_proc_net_create(const char *name,
1333 const struct file_operations *fops)
1334{
1335 char *pname;
1336 struct proc_dir_entry *p;
1337
1338 if (!ipconfig_dir)
1339 return -ENOMEM;
1340
1341 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name);
1342 if (!pname)
1343 return -ENOMEM;
1344
1345 p = proc_create(pname, 0444, init_net.proc_net, fops);
1346 kfree(pname);
1347 if (!p)
1348 return -ENOMEM;
1349
1350 return 0;
1351}
1352
1353/* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */
1354static int ntp_servers_seq_show(struct seq_file *seq, void *v)
1355{
1356 int i;
1357
1358 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) {
1359 if (ic_ntp_servers[i] != NONE)
1360 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]);
1361 }
1362 return 0;
1363}
1364
1365static int ntp_servers_seq_open(struct inode *inode, struct file *file)
1366{
1367 return single_open(file, ntp_servers_seq_show, NULL);
1368}
1369
1370static const struct file_operations ntp_servers_seq_fops = {
1371 .open = ntp_servers_seq_open,
1372 .read = seq_read,
1373 .llseek = seq_lseek,
1374 .release = single_release,
1375};
1376#endif /* CONFIG_PROC_FS */
1377
1378/*
1379 * Extract IP address from the parameter string if needed. Note that we
1380 * need to have root_server_addr set _before_ IPConfig gets called as it
1381 * can override it.
1382 */
1383__be32 __init root_nfs_parse_addr(char *name)
1384{
1385 __be32 addr;
1386 int octets = 0;
1387 char *cp, *cq;
1388
1389 cp = cq = name;
1390 while (octets < 4) {
1391 while (*cp >= '0' && *cp <= '9')
1392 cp++;
1393 if (cp == cq || cp - cq > 3)
1394 break;
1395 if (*cp == '.' || octets == 3)
1396 octets++;
1397 if (octets < 4)
1398 cp++;
1399 cq = cp;
1400 }
1401 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1402 if (*cp == ':')
1403 *cp++ = '\0';
1404 addr = in_aton(name);
1405 memmove(name, cp, strlen(cp) + 1);
1406 } else
1407 addr = NONE;
1408
1409 return addr;
1410}
1411
1412#define DEVICE_WAIT_MAX 12 /* 12 seconds */
1413
1414static int __init wait_for_devices(void)
1415{
1416 int i;
1417
1418 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1419 struct net_device *dev;
1420 int found = 0;
1421
1422 rtnl_lock();
1423 for_each_netdev(&init_net, dev) {
1424 if (ic_is_init_dev(dev)) {
1425 found = 1;
1426 break;
1427 }
1428 }
1429 rtnl_unlock();
1430 if (found)
1431 return 0;
1432 ssleep(1);
1433 }
1434 return -ENODEV;
1435}
1436
1437/*
1438 * IP Autoconfig dispatcher.
1439 */
1440
1441static int __init ip_auto_config(void)
1442{
1443 __be32 addr;
1444#ifdef IPCONFIG_DYNAMIC
1445 int retries = CONF_OPEN_RETRIES;
1446#endif
1447 int err;
1448 unsigned int i;
1449
1450 /* Initialise all name servers and NTP servers to NONE (but only if the
1451 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded,
1452 * otherwise we'll overwrite the IP addresses specified there)
1453 */
1454 if (ic_set_manually == 0) {
1455 ic_nameservers_predef();
1456 ic_ntp_servers_predef();
1457 }
1458
1459#ifdef CONFIG_PROC_FS
1460 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show);
1461
1462 if (ipconfig_proc_net_init() == 0)
1463 ipconfig_proc_net_create("ntp_servers", &ntp_servers_seq_fops);
1464#endif /* CONFIG_PROC_FS */
1465
1466 if (!ic_enable)
1467 return 0;
1468
1469 pr_debug("IP-Config: Entered.\n");
1470#ifdef IPCONFIG_DYNAMIC
1471 try_try_again:
1472#endif
1473 /* Wait for devices to appear */
1474 err = wait_for_devices();
1475 if (err)
1476 return err;
1477
1478 /* Setup all network devices */
1479 err = ic_open_devs();
1480 if (err)
1481 return err;
1482
1483 /* Give drivers a chance to settle */
1484 msleep(CONF_POST_OPEN);
1485
1486 /*
1487 * If the config information is insufficient (e.g., our IP address or
1488 * IP address of the boot server is missing or we have multiple network
1489 * interfaces and no default was set), use BOOTP or RARP to get the
1490 * missing values.
1491 */
1492 if (ic_myaddr == NONE ||
1493#ifdef CONFIG_ROOT_NFS
1494 (root_server_addr == NONE &&
1495 ic_servaddr == NONE &&
1496 ROOT_DEV == Root_NFS) ||
1497#endif
1498 ic_first_dev->next) {
1499#ifdef IPCONFIG_DYNAMIC
1500 if (ic_dynamic() < 0) {
1501 ic_close_devs();
1502
1503 /*
1504 * I don't know why, but sometimes the
1505 * eepro100 driver (at least) gets upset and
1506 * doesn't work the first time it's opened.
1507 * But then if you close it and reopen it, it
1508 * works just fine. So we need to try that at
1509 * least once before giving up.
1510 *
1511 * Also, if the root will be NFS-mounted, we
1512 * have nowhere to go if DHCP fails. So we
1513 * just have to keep trying forever.
1514 *
1515 * -- Chip
1516 */
1517#ifdef CONFIG_ROOT_NFS
1518 if (ROOT_DEV == Root_NFS) {
1519 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1520 goto try_try_again;
1521 }
1522#endif
1523
1524 if (--retries) {
1525 pr_err("IP-Config: Reopening network devices...\n");
1526 goto try_try_again;
1527 }
1528
1529 /* Oh, well. At least we tried. */
1530 pr_err("IP-Config: Auto-configuration of network failed\n");
1531 return -1;
1532 }
1533#else /* !DYNAMIC */
1534 pr_err("IP-Config: Incomplete network configuration information\n");
1535 ic_close_devs();
1536 return -1;
1537#endif /* IPCONFIG_DYNAMIC */
1538 } else {
1539 /* Device selected manually or only one device -> use it */
1540 ic_dev = ic_first_dev;
1541 }
1542
1543 addr = root_nfs_parse_addr(root_server_path);
1544 if (root_server_addr == NONE)
1545 root_server_addr = addr;
1546
1547 /*
1548 * Use defaults wherever applicable.
1549 */
1550 if (ic_defaults() < 0)
1551 return -1;
1552
1553 /*
1554 * Record which protocol was actually used.
1555 */
1556#ifdef IPCONFIG_DYNAMIC
1557 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1558#endif
1559
1560#ifndef IPCONFIG_SILENT
1561 /*
1562 * Clue in the operator.
1563 */
1564 pr_info("IP-Config: Complete:\n");
1565
1566 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1567 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1568 &ic_myaddr, &ic_netmask, &ic_gateway);
1569 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1570 utsname()->nodename, ic_domain, utsname()->domainname);
1571 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1572 &ic_servaddr, &root_server_addr, root_server_path);
1573 if (ic_dev_mtu)
1574 pr_cont(", mtu=%d", ic_dev_mtu);
1575 /* Name servers (if any): */
1576 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1577 if (ic_nameservers[i] != NONE) {
1578 if (i == 0)
1579 pr_info(" nameserver%u=%pI4",
1580 i, &ic_nameservers[i]);
1581 else
1582 pr_cont(", nameserver%u=%pI4",
1583 i, &ic_nameservers[i]);
1584 }
1585 if (i + 1 == CONF_NAMESERVERS_MAX)
1586 pr_cont("\n");
1587 }
1588 /* NTP servers (if any): */
1589 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) {
1590 if (ic_ntp_servers[i] != NONE) {
1591 if (i == 0)
1592 pr_info(" ntpserver%u=%pI4",
1593 i, &ic_ntp_servers[i]);
1594 else
1595 pr_cont(", ntpserver%u=%pI4",
1596 i, &ic_ntp_servers[i]);
1597 }
1598 if (i + 1 == CONF_NTP_SERVERS_MAX)
1599 pr_cont("\n");
1600 }
1601#endif /* !SILENT */
1602
1603 /*
1604 * Close all network devices except the device we've
1605 * autoconfigured and set up routes.
1606 */
1607 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1608 err = -1;
1609 else
1610 err = 0;
1611
1612 ic_close_devs();
1613
1614 return err;
1615}
1616
1617late_initcall(ip_auto_config);
1618
1619
1620/*
1621 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1622 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1623 */
1624static int __init ic_proto_name(char *name)
1625{
1626 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1627 return 1;
1628 }
1629 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1630 return 0;
1631 }
1632#ifdef CONFIG_IP_PNP_DHCP
1633 else if (!strncmp(name, "dhcp", 4)) {
1634 char *client_id;
1635
1636 ic_proto_enabled &= ~IC_RARP;
1637 client_id = strstr(name, "dhcp,");
1638 if (client_id) {
1639 char *v;
1640
1641 client_id = client_id + 5;
1642 v = strchr(client_id, ',');
1643 if (!v)
1644 return 1;
1645 *v = 0;
1646 if (kstrtou8(client_id, 0, dhcp_client_identifier))
1647 pr_debug("DHCP: Invalid client identifier type\n");
1648 strncpy(dhcp_client_identifier + 1, v + 1, 251);
1649 *v = ',';
1650 }
1651 return 1;
1652 }
1653#endif
1654#ifdef CONFIG_IP_PNP_BOOTP
1655 else if (!strcmp(name, "bootp")) {
1656 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1657 return 1;
1658 }
1659#endif
1660#ifdef CONFIG_IP_PNP_RARP
1661 else if (!strcmp(name, "rarp")) {
1662 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1663 return 1;
1664 }
1665#endif
1666#ifdef IPCONFIG_DYNAMIC
1667 else if (!strcmp(name, "both")) {
1668 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1669 return 1;
1670 }
1671#endif
1672 return 0;
1673}
1674
1675static int __init ip_auto_config_setup(char *addrs)
1676{
1677 char *cp, *ip, *dp;
1678 int num = 0;
1679
1680 ic_set_manually = 1;
1681 ic_enable = 1;
1682
1683 /*
1684 * If any dhcp, bootp etc options are set, leave autoconfig on
1685 * and skip the below static IP processing.
1686 */
1687 if (ic_proto_name(addrs))
1688 return 1;
1689
1690 /* If no static IP is given, turn off autoconfig and bail. */
1691 if (*addrs == 0 ||
1692 strcmp(addrs, "off") == 0 ||
1693 strcmp(addrs, "none") == 0) {
1694 ic_enable = 0;
1695 return 1;
1696 }
1697
1698 /* Initialise all name servers and NTP servers to NONE */
1699 ic_nameservers_predef();
1700 ic_ntp_servers_predef();
1701
1702 /* Parse string for static IP assignment. */
1703 ip = addrs;
1704 while (ip && *ip) {
1705 if ((cp = strchr(ip, ':')))
1706 *cp++ = '\0';
1707 if (strlen(ip) > 0) {
1708 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1709 switch (num) {
1710 case 0:
1711 if ((ic_myaddr = in_aton(ip)) == ANY)
1712 ic_myaddr = NONE;
1713 break;
1714 case 1:
1715 if ((ic_servaddr = in_aton(ip)) == ANY)
1716 ic_servaddr = NONE;
1717 break;
1718 case 2:
1719 if ((ic_gateway = in_aton(ip)) == ANY)
1720 ic_gateway = NONE;
1721 break;
1722 case 3:
1723 if ((ic_netmask = in_aton(ip)) == ANY)
1724 ic_netmask = NONE;
1725 break;
1726 case 4:
1727 if ((dp = strchr(ip, '.'))) {
1728 *dp++ = '\0';
1729 strlcpy(utsname()->domainname, dp,
1730 sizeof(utsname()->domainname));
1731 }
1732 strlcpy(utsname()->nodename, ip,
1733 sizeof(utsname()->nodename));
1734 ic_host_name_set = 1;
1735 break;
1736 case 5:
1737 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1738 break;
1739 case 6:
1740 if (ic_proto_name(ip) == 0 &&
1741 ic_myaddr == NONE) {
1742 ic_enable = 0;
1743 }
1744 break;
1745 case 7:
1746 if (CONF_NAMESERVERS_MAX >= 1) {
1747 ic_nameservers[0] = in_aton(ip);
1748 if (ic_nameservers[0] == ANY)
1749 ic_nameservers[0] = NONE;
1750 }
1751 break;
1752 case 8:
1753 if (CONF_NAMESERVERS_MAX >= 2) {
1754 ic_nameservers[1] = in_aton(ip);
1755 if (ic_nameservers[1] == ANY)
1756 ic_nameservers[1] = NONE;
1757 }
1758 break;
1759 case 9:
1760 if (CONF_NTP_SERVERS_MAX >= 1) {
1761 ic_ntp_servers[0] = in_aton(ip);
1762 if (ic_ntp_servers[0] == ANY)
1763 ic_ntp_servers[0] = NONE;
1764 }
1765 break;
1766 }
1767 }
1768 ip = cp;
1769 num++;
1770 }
1771
1772 return 1;
1773}
1774__setup("ip=", ip_auto_config_setup);
1775
1776static int __init nfsaddrs_config_setup(char *addrs)
1777{
1778 return ip_auto_config_setup(addrs);
1779}
1780__setup("nfsaddrs=", nfsaddrs_config_setup);
1781
1782static int __init vendor_class_identifier_setup(char *addrs)
1783{
1784 if (strlcpy(vendor_class_identifier, addrs,
1785 sizeof(vendor_class_identifier))
1786 >= sizeof(vendor_class_identifier))
1787 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1788 vendor_class_identifier);
1789 return 1;
1790}
1791__setup("dhcpclass=", vendor_class_identifier_setup);
1792