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
89 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
90 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
91 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
92 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
93 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
94 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
95 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
96 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
97 - '3' from resolv.h */
98 #define CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */
99
100 #define NONE cpu_to_be32(INADDR_NONE)
101 #define ANY cpu_to_be32(INADDR_ANY)
102
103 /* Wait for carrier timeout default in seconds */
104 static unsigned int carrier_timeout = 120;
105
106 /*
107 * Public IP configuration
108 */
109
110 /* This is used by platforms which might be able to set the ipconfig
111 * variables using firmware environment vars. If this is set, it will
112 * ignore such firmware variables.
113 */
114 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
115
116 static int ic_enable __initdata; /* IP config enabled? */
117
118 /* Protocol choice */
119 int ic_proto_enabled __initdata = 0
120 #ifdef IPCONFIG_BOOTP
121 | IC_BOOTP
122 #endif
123 #ifdef CONFIG_IP_PNP_DHCP
124 | IC_USE_DHCP
125 #endif
126 #ifdef IPCONFIG_RARP
127 | IC_RARP
128 #endif
129 ;
130
131 static int ic_host_name_set __initdata; /* Host name set by us? */
132
133 __be32 ic_myaddr = NONE; /* My IP address */
134 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
135 __be32 ic_gateway = NONE; /* Gateway IP address */
136
137 #ifdef IPCONFIG_DYNAMIC
138 static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */
139 #endif
140
141 __be32 ic_servaddr = NONE; /* Boot server IP address */
142
143 __be32 root_server_addr = NONE; /* Address of NFS server */
144 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
145
146 /* vendor class identifier */
147 static char vendor_class_identifier[253] __initdata;
148
149 #if defined(CONFIG_IP_PNP_DHCP)
150 static char dhcp_client_identifier[253] __initdata;
151 #endif
152
153 /* Persistent data: */
154
155 #ifdef IPCONFIG_DYNAMIC
156 static int ic_proto_used; /* Protocol used, if any */
157 #else
158 #define ic_proto_used 0
159 #endif
160 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
161 static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */
162 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
163
164 /*
165 * Private state.
166 */
167
168 /* Name of user-selected boot device */
169 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
170
171 /* Protocols supported by available interfaces */
172 static int ic_proto_have_if __initdata;
173
174 /* MTU for boot device */
175 static int ic_dev_mtu __initdata;
176
177 #ifdef IPCONFIG_DYNAMIC
178 static DEFINE_SPINLOCK(ic_recv_lock);
179 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */
180 #endif
181 #ifdef IPCONFIG_DHCP
182 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */
183 #endif
184
185
186 /*
187 * Network devices
188 */
189
190 struct ic_device {
191 struct ic_device *next;
192 struct net_device *dev;
193 unsigned short flags;
194 short able;
195 __be32 xid;
196 };
197
198 static struct ic_device *ic_first_dev __initdata; /* List of open device */
199 static struct ic_device *ic_dev __initdata; /* Selected device */
200
ic_is_init_dev(struct net_device * dev)201 static bool __init ic_is_init_dev(struct net_device *dev)
202 {
203 if (dev->flags & IFF_LOOPBACK)
204 return false;
205 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
206 (!(dev->flags & IFF_LOOPBACK) &&
207 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
208 strncmp(dev->name, "dummy", 5));
209 }
210
ic_open_devs(void)211 static int __init ic_open_devs(void)
212 {
213 struct ic_device *d, **last;
214 struct net_device *dev;
215 unsigned short oflags;
216 unsigned long start, next_msg;
217
218 last = &ic_first_dev;
219 rtnl_lock();
220
221 /* bring loopback and DSA master network devices up first */
222 for_each_netdev(&init_net, dev) {
223 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
224 continue;
225 if (dev_change_flags(dev, dev->flags | IFF_UP, NULL) < 0)
226 pr_err("IP-Config: Failed to open %s\n", dev->name);
227 }
228
229 for_each_netdev(&init_net, dev) {
230 if (ic_is_init_dev(dev)) {
231 int able = 0;
232 if (dev->mtu >= 364)
233 able |= IC_BOOTP;
234 else
235 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
236 dev->name, dev->mtu);
237 if (!(dev->flags & IFF_NOARP))
238 able |= IC_RARP;
239 able &= ic_proto_enabled;
240 if (ic_proto_enabled && !able)
241 continue;
242 oflags = dev->flags;
243 if (dev_change_flags(dev, oflags | IFF_UP, NULL) < 0) {
244 pr_err("IP-Config: Failed to open %s\n",
245 dev->name);
246 continue;
247 }
248 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
249 rtnl_unlock();
250 return -ENOMEM;
251 }
252 d->dev = dev;
253 *last = d;
254 last = &d->next;
255 d->flags = oflags;
256 d->able = able;
257 if (able & IC_BOOTP)
258 get_random_bytes(&d->xid, sizeof(__be32));
259 else
260 d->xid = 0;
261 ic_proto_have_if |= able;
262 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
263 dev->name, able, d->xid);
264 }
265 }
266
267 /* no point in waiting if we could not bring up at least one device */
268 if (!ic_first_dev)
269 goto have_carrier;
270
271 /* wait for a carrier on at least one device */
272 start = jiffies;
273 next_msg = start + msecs_to_jiffies(20000);
274 while (time_before(jiffies, start +
275 msecs_to_jiffies(carrier_timeout * 1000))) {
276 int wait, elapsed;
277
278 for_each_netdev(&init_net, dev)
279 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
280 goto have_carrier;
281
282 msleep(1);
283
284 if (time_before(jiffies, next_msg))
285 continue;
286
287 elapsed = jiffies_to_msecs(jiffies - start);
288 wait = (carrier_timeout * 1000 - elapsed + 500) / 1000;
289 pr_info("Waiting up to %d more seconds for network.\n", wait);
290 next_msg = jiffies + msecs_to_jiffies(20000);
291 }
292 have_carrier:
293 rtnl_unlock();
294
295 *last = NULL;
296
297 if (!ic_first_dev) {
298 if (user_dev_name[0])
299 pr_err("IP-Config: Device `%s' not found\n",
300 user_dev_name);
301 else
302 pr_err("IP-Config: No network devices available\n");
303 return -ENODEV;
304 }
305 return 0;
306 }
307
ic_close_devs(void)308 static void __init ic_close_devs(void)
309 {
310 struct ic_device *d, *next;
311 struct net_device *dev;
312
313 rtnl_lock();
314 next = ic_first_dev;
315 while ((d = next)) {
316 next = d->next;
317 dev = d->dev;
318 if (d != ic_dev && !netdev_uses_dsa(dev)) {
319 pr_debug("IP-Config: Downing %s\n", dev->name);
320 dev_change_flags(dev, d->flags, NULL);
321 }
322 kfree(d);
323 }
324 rtnl_unlock();
325 }
326
327 /*
328 * Interface to various network functions.
329 */
330
331 static inline void
set_sockaddr(struct sockaddr_in * sin,__be32 addr,__be16 port)332 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
333 {
334 sin->sin_family = AF_INET;
335 sin->sin_addr.s_addr = addr;
336 sin->sin_port = port;
337 }
338
339 /*
340 * Set up interface addresses and routes.
341 */
342
ic_setup_if(void)343 static int __init ic_setup_if(void)
344 {
345 struct ifreq ir;
346 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
347 int err;
348
349 memset(&ir, 0, sizeof(ir));
350 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name);
351 set_sockaddr(sin, ic_myaddr, 0);
352 if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) {
353 pr_err("IP-Config: Unable to set interface address (%d)\n",
354 err);
355 return -1;
356 }
357 set_sockaddr(sin, ic_netmask, 0);
358 if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) {
359 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
360 err);
361 return -1;
362 }
363 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
364 if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) {
365 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
366 err);
367 return -1;
368 }
369 /* Handle the case where we need non-standard MTU on the boot link (a network
370 * using jumbo frames, for instance). If we can't set the mtu, don't error
371 * out, we'll try to muddle along.
372 */
373 if (ic_dev_mtu != 0) {
374 rtnl_lock();
375 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0)
376 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
377 ic_dev_mtu, err);
378 rtnl_unlock();
379 }
380 return 0;
381 }
382
ic_setup_routes(void)383 static int __init ic_setup_routes(void)
384 {
385 /* No need to setup device routes, only the default route... */
386
387 if (ic_gateway != NONE) {
388 struct rtentry rm;
389 int err;
390
391 memset(&rm, 0, sizeof(rm));
392 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
393 pr_err("IP-Config: Gateway not on directly connected network\n");
394 return -1;
395 }
396 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
397 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
398 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
399 rm.rt_flags = RTF_UP | RTF_GATEWAY;
400 if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) {
401 pr_err("IP-Config: Cannot add default route (%d)\n",
402 err);
403 return -1;
404 }
405 }
406
407 return 0;
408 }
409
410 /*
411 * Fill in default values for all missing parameters.
412 */
413
ic_defaults(void)414 static int __init ic_defaults(void)
415 {
416 /*
417 * At this point we have no userspace running so need not
418 * claim locks on system_utsname
419 */
420
421 if (!ic_host_name_set)
422 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
423
424 if (root_server_addr == NONE)
425 root_server_addr = ic_servaddr;
426
427 if (ic_netmask == NONE) {
428 if (IN_CLASSA(ntohl(ic_myaddr)))
429 ic_netmask = htonl(IN_CLASSA_NET);
430 else if (IN_CLASSB(ntohl(ic_myaddr)))
431 ic_netmask = htonl(IN_CLASSB_NET);
432 else if (IN_CLASSC(ntohl(ic_myaddr)))
433 ic_netmask = htonl(IN_CLASSC_NET);
434 else if (IN_CLASSE(ntohl(ic_myaddr)))
435 ic_netmask = htonl(IN_CLASSE_NET);
436 else {
437 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
438 &ic_myaddr);
439 return -1;
440 }
441 pr_notice("IP-Config: Guessing netmask %pI4\n",
442 &ic_netmask);
443 }
444
445 return 0;
446 }
447
448 /*
449 * RARP support.
450 */
451
452 #ifdef IPCONFIG_RARP
453
454 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
455
456 static struct packet_type rarp_packet_type __initdata = {
457 .type = cpu_to_be16(ETH_P_RARP),
458 .func = ic_rarp_recv,
459 };
460
ic_rarp_init(void)461 static inline void __init ic_rarp_init(void)
462 {
463 dev_add_pack(&rarp_packet_type);
464 }
465
ic_rarp_cleanup(void)466 static inline void __init ic_rarp_cleanup(void)
467 {
468 dev_remove_pack(&rarp_packet_type);
469 }
470
471 /*
472 * Process received RARP packet.
473 */
474 static int __init
ic_rarp_recv(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * orig_dev)475 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
476 {
477 struct arphdr *rarp;
478 unsigned char *rarp_ptr;
479 __be32 sip, tip;
480 unsigned char *tha; /* t for "target" */
481 struct ic_device *d;
482
483 if (!net_eq(dev_net(dev), &init_net))
484 goto drop;
485
486 skb = skb_share_check(skb, GFP_ATOMIC);
487 if (!skb)
488 return NET_RX_DROP;
489
490 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
491 goto drop;
492
493 /* Basic sanity checks can be done without the lock. */
494 rarp = (struct arphdr *)skb_transport_header(skb);
495
496 /* If this test doesn't pass, it's not IP, or we should
497 * ignore it anyway.
498 */
499 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
500 goto drop;
501
502 /* If it's not a RARP reply, delete it. */
503 if (rarp->ar_op != htons(ARPOP_RREPLY))
504 goto drop;
505
506 /* If it's not Ethernet, delete it. */
507 if (rarp->ar_pro != htons(ETH_P_IP))
508 goto drop;
509
510 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
511 goto drop;
512
513 /* OK, it is all there and looks valid, process... */
514 rarp = (struct arphdr *)skb_transport_header(skb);
515 rarp_ptr = (unsigned char *) (rarp + 1);
516
517 /* One reply at a time, please. */
518 spin_lock(&ic_recv_lock);
519
520 /* If we already have a reply, just drop the packet */
521 if (ic_got_reply)
522 goto drop_unlock;
523
524 /* Find the ic_device that the packet arrived on */
525 d = ic_first_dev;
526 while (d && d->dev != dev)
527 d = d->next;
528 if (!d)
529 goto drop_unlock; /* should never happen */
530
531 /* Extract variable-width fields */
532 rarp_ptr += dev->addr_len;
533 memcpy(&sip, rarp_ptr, 4);
534 rarp_ptr += 4;
535 tha = rarp_ptr;
536 rarp_ptr += dev->addr_len;
537 memcpy(&tip, rarp_ptr, 4);
538
539 /* Discard packets which are not meant for us. */
540 if (memcmp(tha, dev->dev_addr, dev->addr_len))
541 goto drop_unlock;
542
543 /* Discard packets which are not from specified server. */
544 if (ic_servaddr != NONE && ic_servaddr != sip)
545 goto drop_unlock;
546
547 /* We have a winner! */
548 ic_dev = d;
549 if (ic_myaddr == NONE)
550 ic_myaddr = tip;
551 ic_servaddr = sip;
552 ic_addrservaddr = sip;
553 ic_got_reply = IC_RARP;
554
555 drop_unlock:
556 /* Show's over. Nothing to see here. */
557 spin_unlock(&ic_recv_lock);
558
559 drop:
560 /* Throw the packet out. */
561 kfree_skb(skb);
562 return 0;
563 }
564
565
566 /*
567 * Send RARP request packet over a single interface.
568 */
ic_rarp_send_if(struct ic_device * d)569 static void __init ic_rarp_send_if(struct ic_device *d)
570 {
571 struct net_device *dev = d->dev;
572 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
573 dev->dev_addr, dev->dev_addr);
574 }
575 #endif
576
577 /*
578 * Predefine Nameservers
579 */
ic_nameservers_predef(void)580 static inline void __init ic_nameservers_predef(void)
581 {
582 int i;
583
584 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
585 ic_nameservers[i] = NONE;
586 }
587
588 /* Predefine NTP servers */
ic_ntp_servers_predef(void)589 static inline void __init ic_ntp_servers_predef(void)
590 {
591 int i;
592
593 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++)
594 ic_ntp_servers[i] = NONE;
595 }
596
597 /*
598 * DHCP/BOOTP support.
599 */
600
601 #ifdef IPCONFIG_BOOTP
602
603 struct bootp_pkt { /* BOOTP packet format */
604 struct iphdr iph; /* IP header */
605 struct udphdr udph; /* UDP header */
606 u8 op; /* 1=request, 2=reply */
607 u8 htype; /* HW address type */
608 u8 hlen; /* HW address length */
609 u8 hops; /* Used only by gateways */
610 __be32 xid; /* Transaction ID */
611 __be16 secs; /* Seconds since we started */
612 __be16 flags; /* Just what it says */
613 __be32 client_ip; /* Client's IP address if known */
614 __be32 your_ip; /* Assigned IP address */
615 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
616 __be32 relay_ip; /* IP address of BOOTP relay */
617 u8 hw_addr[16]; /* Client's HW address */
618 u8 serv_name[64]; /* Server host name */
619 u8 boot_file[128]; /* Name of boot file */
620 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
621 };
622
623 /* packet ops */
624 #define BOOTP_REQUEST 1
625 #define BOOTP_REPLY 2
626
627 /* DHCP message types */
628 #define DHCPDISCOVER 1
629 #define DHCPOFFER 2
630 #define DHCPREQUEST 3
631 #define DHCPDECLINE 4
632 #define DHCPACK 5
633 #define DHCPNAK 6
634 #define DHCPRELEASE 7
635 #define DHCPINFORM 8
636
637 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
638
639 static struct packet_type bootp_packet_type __initdata = {
640 .type = cpu_to_be16(ETH_P_IP),
641 .func = ic_bootp_recv,
642 };
643
644 /*
645 * Initialize DHCP/BOOTP extension fields in the request.
646 */
647
648 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
649
650 #ifdef IPCONFIG_DHCP
651
652 static void __init
ic_dhcp_init_options(u8 * options,struct ic_device * d)653 ic_dhcp_init_options(u8 *options, struct ic_device *d)
654 {
655 u8 mt = ((ic_servaddr == NONE)
656 ? DHCPDISCOVER : DHCPREQUEST);
657 u8 *e = options;
658 int len;
659
660 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);
661
662 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
663 e += 4;
664
665 *e++ = 53; /* DHCP message type */
666 *e++ = 1;
667 *e++ = mt;
668
669 if (mt == DHCPREQUEST) {
670 *e++ = 54; /* Server ID (IP address) */
671 *e++ = 4;
672 memcpy(e, &ic_servaddr, 4);
673 e += 4;
674
675 *e++ = 50; /* Requested IP address */
676 *e++ = 4;
677 memcpy(e, &ic_myaddr, 4);
678 e += 4;
679 }
680
681 /* always? */
682 {
683 static const u8 ic_req_params[] = {
684 1, /* Subnet mask */
685 3, /* Default gateway */
686 6, /* DNS server */
687 12, /* Host name */
688 15, /* Domain name */
689 17, /* Boot path */
690 26, /* MTU */
691 40, /* NIS domain name */
692 42, /* NTP servers */
693 };
694
695 *e++ = 55; /* Parameter request list */
696 *e++ = sizeof(ic_req_params);
697 memcpy(e, ic_req_params, sizeof(ic_req_params));
698 e += sizeof(ic_req_params);
699
700 if (ic_host_name_set) {
701 *e++ = 12; /* host-name */
702 len = strlen(utsname()->nodename);
703 *e++ = len;
704 memcpy(e, utsname()->nodename, len);
705 e += len;
706 }
707 if (*vendor_class_identifier) {
708 pr_info("DHCP: sending class identifier \"%s\"\n",
709 vendor_class_identifier);
710 *e++ = 60; /* Class-identifier */
711 len = strlen(vendor_class_identifier);
712 *e++ = len;
713 memcpy(e, vendor_class_identifier, len);
714 e += len;
715 }
716 len = strlen(dhcp_client_identifier + 1);
717 /* the minimum length of identifier is 2, include 1 byte type,
718 * and can not be larger than the length of options
719 */
720 if (len >= 1 && len < 312 - (e - options) - 1) {
721 *e++ = 61;
722 *e++ = len + 1;
723 memcpy(e, dhcp_client_identifier, len + 1);
724 e += len + 1;
725 }
726 }
727
728 *e++ = 255; /* End of the list */
729 }
730
731 #endif /* IPCONFIG_DHCP */
732
ic_bootp_init_ext(u8 * e)733 static void __init ic_bootp_init_ext(u8 *e)
734 {
735 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
736 e += 4;
737 *e++ = 1; /* Subnet mask request */
738 *e++ = 4;
739 e += 4;
740 *e++ = 3; /* Default gateway request */
741 *e++ = 4;
742 e += 4;
743 #if CONF_NAMESERVERS_MAX > 0
744 *e++ = 6; /* (DNS) name server request */
745 *e++ = 4 * CONF_NAMESERVERS_MAX;
746 e += 4 * CONF_NAMESERVERS_MAX;
747 #endif
748 *e++ = 12; /* Host name request */
749 *e++ = 32;
750 e += 32;
751 *e++ = 40; /* NIS Domain name request */
752 *e++ = 32;
753 e += 32;
754 *e++ = 17; /* Boot path */
755 *e++ = 40;
756 e += 40;
757
758 *e++ = 57; /* set extension buffer size for reply */
759 *e++ = 2;
760 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
761 *e++ = 150;
762
763 *e++ = 255; /* End of the list */
764 }
765
766
767 /*
768 * Initialize the DHCP/BOOTP mechanism.
769 */
ic_bootp_init(void)770 static inline void __init ic_bootp_init(void)
771 {
772 /* Re-initialise all name servers and NTP servers to NONE, in case any
773 * were set via the "ip=" or "nfsaddrs=" kernel command line parameters:
774 * any IP addresses specified there will already have been decoded but
775 * are no longer needed
776 */
777 ic_nameservers_predef();
778 ic_ntp_servers_predef();
779
780 dev_add_pack(&bootp_packet_type);
781 }
782
783
784 /*
785 * DHCP/BOOTP cleanup.
786 */
ic_bootp_cleanup(void)787 static inline void __init ic_bootp_cleanup(void)
788 {
789 dev_remove_pack(&bootp_packet_type);
790 }
791
792
793 /*
794 * Send DHCP/BOOTP request to single interface.
795 */
ic_bootp_send_if(struct ic_device * d,unsigned long jiffies_diff)796 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
797 {
798 struct net_device *dev = d->dev;
799 struct sk_buff *skb;
800 struct bootp_pkt *b;
801 struct iphdr *h;
802 int hlen = LL_RESERVED_SPACE(dev);
803 int tlen = dev->needed_tailroom;
804
805 /* Allocate packet */
806 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
807 GFP_KERNEL);
808 if (!skb)
809 return;
810 skb_reserve(skb, hlen);
811 b = skb_put_zero(skb, sizeof(struct bootp_pkt));
812
813 /* Construct IP header */
814 skb_reset_network_header(skb);
815 h = ip_hdr(skb);
816 h->version = 4;
817 h->ihl = 5;
818 h->tot_len = htons(sizeof(struct bootp_pkt));
819 h->frag_off = htons(IP_DF);
820 h->ttl = 64;
821 h->protocol = IPPROTO_UDP;
822 h->daddr = htonl(INADDR_BROADCAST);
823 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
824
825 /* Construct UDP header */
826 b->udph.source = htons(68);
827 b->udph.dest = htons(67);
828 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
829 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
830
831 /* Construct DHCP/BOOTP header */
832 b->op = BOOTP_REQUEST;
833 if (dev->type < 256) /* check for false types */
834 b->htype = dev->type;
835 else if (dev->type == ARPHRD_FDDI)
836 b->htype = ARPHRD_ETHER;
837 else {
838 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
839 dev->name);
840 b->htype = dev->type; /* can cause undefined behavior */
841 }
842
843 /* server_ip and your_ip address are both already zero per RFC2131 */
844 b->hlen = dev->addr_len;
845 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
846 b->secs = htons(jiffies_diff / HZ);
847 b->xid = d->xid;
848
849 /* add DHCP options or BOOTP extensions */
850 #ifdef IPCONFIG_DHCP
851 if (ic_proto_enabled & IC_USE_DHCP)
852 ic_dhcp_init_options(b->exten, d);
853 else
854 #endif
855 ic_bootp_init_ext(b->exten);
856
857 /* Chain packet down the line... */
858 skb->dev = dev;
859 skb->protocol = htons(ETH_P_IP);
860 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
861 dev->broadcast, dev->dev_addr, skb->len) < 0) {
862 kfree_skb(skb);
863 printk("E");
864 return;
865 }
866
867 if (dev_queue_xmit(skb) < 0)
868 printk("E");
869 }
870
871
872 /*
873 * Copy BOOTP-supplied string if not already set.
874 */
ic_bootp_string(char * dest,char * src,int len,int max)875 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
876 {
877 if (!len)
878 return 0;
879 if (len > max-1)
880 len = max-1;
881 memcpy(dest, src, len);
882 dest[len] = '\0';
883 return 1;
884 }
885
886
887 /*
888 * Process BOOTP extensions.
889 */
ic_do_bootp_ext(u8 * ext)890 static void __init ic_do_bootp_ext(u8 *ext)
891 {
892 u8 servers;
893 int i;
894 __be16 mtu;
895
896 u8 *c;
897
898 pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
899 for (c=ext+2; c<ext+2+ext[1]; c++)
900 pr_debug(" %02x", *c);
901 pr_debug("\n");
902
903 switch (*ext++) {
904 case 1: /* Subnet mask */
905 if (ic_netmask == NONE)
906 memcpy(&ic_netmask, ext+1, 4);
907 break;
908 case 3: /* Default gateway */
909 if (ic_gateway == NONE)
910 memcpy(&ic_gateway, ext+1, 4);
911 break;
912 case 6: /* DNS server */
913 servers= *ext/4;
914 if (servers > CONF_NAMESERVERS_MAX)
915 servers = CONF_NAMESERVERS_MAX;
916 for (i = 0; i < servers; i++) {
917 if (ic_nameservers[i] == NONE)
918 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
919 }
920 break;
921 case 12: /* Host name */
922 ic_bootp_string(utsname()->nodename, ext+1, *ext,
923 __NEW_UTS_LEN);
924 ic_host_name_set = 1;
925 break;
926 case 15: /* Domain name (DNS) */
927 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
928 break;
929 case 17: /* Root path */
930 if (!root_server_path[0])
931 ic_bootp_string(root_server_path, ext+1, *ext,
932 sizeof(root_server_path));
933 break;
934 case 26: /* Interface MTU */
935 memcpy(&mtu, ext+1, sizeof(mtu));
936 ic_dev_mtu = ntohs(mtu);
937 break;
938 case 40: /* NIS Domain name (_not_ DNS) */
939 ic_bootp_string(utsname()->domainname, ext+1, *ext,
940 __NEW_UTS_LEN);
941 break;
942 case 42: /* NTP servers */
943 servers = *ext / 4;
944 if (servers > CONF_NTP_SERVERS_MAX)
945 servers = CONF_NTP_SERVERS_MAX;
946 for (i = 0; i < servers; i++) {
947 if (ic_ntp_servers[i] == NONE)
948 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4);
949 }
950 break;
951 }
952 }
953
954
955 /*
956 * Receive BOOTP reply.
957 */
ic_bootp_recv(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * orig_dev)958 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
959 {
960 struct bootp_pkt *b;
961 struct iphdr *h;
962 struct ic_device *d;
963 int len, ext_len;
964
965 if (!net_eq(dev_net(dev), &init_net))
966 goto drop;
967
968 /* Perform verifications before taking the lock. */
969 if (skb->pkt_type == PACKET_OTHERHOST)
970 goto drop;
971
972 skb = skb_share_check(skb, GFP_ATOMIC);
973 if (!skb)
974 return NET_RX_DROP;
975
976 if (!pskb_may_pull(skb,
977 sizeof(struct iphdr) +
978 sizeof(struct udphdr)))
979 goto drop;
980
981 b = (struct bootp_pkt *)skb_network_header(skb);
982 h = &b->iph;
983
984 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
985 goto drop;
986
987 /* Fragments are not supported */
988 if (ip_is_fragment(h)) {
989 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
990 goto drop;
991 }
992
993 if (skb->len < ntohs(h->tot_len))
994 goto drop;
995
996 if (ip_fast_csum((char *) h, h->ihl))
997 goto drop;
998
999 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
1000 goto drop;
1001
1002 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1003 goto drop;
1004
1005 len = ntohs(b->udph.len) - sizeof(struct udphdr);
1006 ext_len = len - (sizeof(*b) -
1007 sizeof(struct iphdr) -
1008 sizeof(struct udphdr) -
1009 sizeof(b->exten));
1010 if (ext_len < 0)
1011 goto drop;
1012
1013 /* Ok the front looks good, make sure we can get at the rest. */
1014 if (!pskb_may_pull(skb, skb->len))
1015 goto drop;
1016
1017 b = (struct bootp_pkt *)skb_network_header(skb);
1018 h = &b->iph;
1019
1020 /* One reply at a time, please. */
1021 spin_lock(&ic_recv_lock);
1022
1023 /* If we already have a reply, just drop the packet */
1024 if (ic_got_reply)
1025 goto drop_unlock;
1026
1027 /* Find the ic_device that the packet arrived on */
1028 d = ic_first_dev;
1029 while (d && d->dev != dev)
1030 d = d->next;
1031 if (!d)
1032 goto drop_unlock; /* should never happen */
1033
1034 /* Is it a reply to our BOOTP request? */
1035 if (b->op != BOOTP_REPLY ||
1036 b->xid != d->xid) {
1037 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1038 d->dev->name, b->op, b->xid);
1039 goto drop_unlock;
1040 }
1041
1042 /* Parse extensions */
1043 if (ext_len >= 4 &&
1044 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1045 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1046 u8 *ext;
1047
1048 #ifdef IPCONFIG_DHCP
1049 if (ic_proto_enabled & IC_USE_DHCP) {
1050 __be32 server_id = NONE;
1051 int mt = 0;
1052
1053 ext = &b->exten[4];
1054 while (ext < end && *ext != 0xff) {
1055 u8 *opt = ext++;
1056 if (*opt == 0) /* Padding */
1057 continue;
1058 ext += *ext + 1;
1059 if (ext >= end)
1060 break;
1061 switch (*opt) {
1062 case 53: /* Message type */
1063 if (opt[1])
1064 mt = opt[2];
1065 break;
1066 case 54: /* Server ID (IP address) */
1067 if (opt[1] >= 4)
1068 memcpy(&server_id, opt + 2, 4);
1069 break;
1070 }
1071 }
1072
1073 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1074
1075 switch (mt) {
1076 case DHCPOFFER:
1077 /* While in the process of accepting one offer,
1078 * ignore all others.
1079 */
1080 if (ic_myaddr != NONE)
1081 goto drop_unlock;
1082
1083 /* Let's accept that offer. */
1084 ic_myaddr = b->your_ip;
1085 ic_servaddr = server_id;
1086 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1087 &ic_myaddr, &b->iph.saddr);
1088 /* The DHCP indicated server address takes
1089 * precedence over the bootp header one if
1090 * they are different.
1091 */
1092 if ((server_id != NONE) &&
1093 (b->server_ip != server_id))
1094 b->server_ip = ic_servaddr;
1095 break;
1096
1097 case DHCPACK:
1098 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1099 goto drop_unlock;
1100
1101 /* Yeah! */
1102 break;
1103
1104 default:
1105 /* Urque. Forget it*/
1106 ic_myaddr = NONE;
1107 ic_servaddr = NONE;
1108 goto drop_unlock;
1109 }
1110
1111 ic_dhcp_msgtype = mt;
1112
1113 }
1114 #endif /* IPCONFIG_DHCP */
1115
1116 ext = &b->exten[4];
1117 while (ext < end && *ext != 0xff) {
1118 u8 *opt = ext++;
1119 if (*opt == 0) /* Padding */
1120 continue;
1121 ext += *ext + 1;
1122 if (ext < end)
1123 ic_do_bootp_ext(opt);
1124 }
1125 }
1126
1127 /* We have a winner! */
1128 ic_dev = d;
1129 ic_myaddr = b->your_ip;
1130 ic_servaddr = b->server_ip;
1131 ic_addrservaddr = b->iph.saddr;
1132 if (ic_gateway == NONE && b->relay_ip)
1133 ic_gateway = b->relay_ip;
1134 if (ic_nameservers[0] == NONE)
1135 ic_nameservers[0] = ic_servaddr;
1136 ic_got_reply = IC_BOOTP;
1137
1138 drop_unlock:
1139 /* Show's over. Nothing to see here. */
1140 spin_unlock(&ic_recv_lock);
1141
1142 drop:
1143 /* Throw the packet out. */
1144 kfree_skb(skb);
1145
1146 return 0;
1147 }
1148
1149
1150 #endif
1151
1152
1153 /*
1154 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1155 */
1156
1157 #ifdef IPCONFIG_DYNAMIC
1158
ic_dynamic(void)1159 static int __init ic_dynamic(void)
1160 {
1161 int retries;
1162 struct ic_device *d;
1163 unsigned long start_jiffies, timeout, jiff;
1164 int do_bootp = ic_proto_have_if & IC_BOOTP;
1165 int do_rarp = ic_proto_have_if & IC_RARP;
1166
1167 /*
1168 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1169 * This routine gets only called when some pieces of information
1170 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1171 */
1172 if (!ic_proto_enabled) {
1173 pr_err("IP-Config: Incomplete network configuration information\n");
1174 return -1;
1175 }
1176
1177 #ifdef IPCONFIG_BOOTP
1178 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1179 pr_err("DHCP/BOOTP: No suitable device found\n");
1180 #endif
1181 #ifdef IPCONFIG_RARP
1182 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1183 pr_err("RARP: No suitable device found\n");
1184 #endif
1185
1186 if (!ic_proto_have_if)
1187 /* Error message already printed */
1188 return -1;
1189
1190 /*
1191 * Setup protocols
1192 */
1193 #ifdef IPCONFIG_BOOTP
1194 if (do_bootp)
1195 ic_bootp_init();
1196 #endif
1197 #ifdef IPCONFIG_RARP
1198 if (do_rarp)
1199 ic_rarp_init();
1200 #endif
1201
1202 /*
1203 * Send requests and wait, until we get an answer. This loop
1204 * seems to be a terrible waste of CPU time, but actually there is
1205 * only one process running at all, so we don't need to use any
1206 * scheduler functions.
1207 * [Actually we could now, but the nothing else running note still
1208 * applies.. - AC]
1209 */
1210 pr_notice("Sending %s%s%s requests .",
1211 do_bootp
1212 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1213 (do_bootp && do_rarp) ? " and " : "",
1214 do_rarp ? "RARP" : "");
1215
1216 start_jiffies = jiffies;
1217 d = ic_first_dev;
1218 retries = CONF_SEND_RETRIES;
1219 get_random_bytes(&timeout, sizeof(timeout));
1220 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1221 for (;;) {
1222 #ifdef IPCONFIG_BOOTP
1223 if (do_bootp && (d->able & IC_BOOTP))
1224 ic_bootp_send_if(d, jiffies - start_jiffies);
1225 #endif
1226 #ifdef IPCONFIG_RARP
1227 if (do_rarp && (d->able & IC_RARP))
1228 ic_rarp_send_if(d);
1229 #endif
1230
1231 if (!d->next) {
1232 jiff = jiffies + timeout;
1233 while (time_before(jiffies, jiff) && !ic_got_reply)
1234 schedule_timeout_uninterruptible(1);
1235 }
1236 #ifdef IPCONFIG_DHCP
1237 /* DHCP isn't done until we get a DHCPACK. */
1238 if ((ic_got_reply & IC_BOOTP) &&
1239 (ic_proto_enabled & IC_USE_DHCP) &&
1240 ic_dhcp_msgtype != DHCPACK) {
1241 ic_got_reply = 0;
1242 /* continue on device that got the reply */
1243 d = ic_dev;
1244 pr_cont(",");
1245 continue;
1246 }
1247 #endif /* IPCONFIG_DHCP */
1248
1249 if (ic_got_reply) {
1250 pr_cont(" OK\n");
1251 break;
1252 }
1253
1254 if ((d = d->next))
1255 continue;
1256
1257 if (! --retries) {
1258 pr_cont(" timed out!\n");
1259 break;
1260 }
1261
1262 d = ic_first_dev;
1263
1264 timeout = timeout CONF_TIMEOUT_MULT;
1265 if (timeout > CONF_TIMEOUT_MAX)
1266 timeout = CONF_TIMEOUT_MAX;
1267
1268 pr_cont(".");
1269 }
1270
1271 #ifdef IPCONFIG_BOOTP
1272 if (do_bootp)
1273 ic_bootp_cleanup();
1274 #endif
1275 #ifdef IPCONFIG_RARP
1276 if (do_rarp)
1277 ic_rarp_cleanup();
1278 #endif
1279
1280 if (!ic_got_reply) {
1281 ic_myaddr = NONE;
1282 return -1;
1283 }
1284
1285 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1286 ((ic_got_reply & IC_RARP) ? "RARP"
1287 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1288 &ic_addrservaddr, &ic_myaddr);
1289
1290 return 0;
1291 }
1292
1293 #endif /* IPCONFIG_DYNAMIC */
1294
1295 #ifdef CONFIG_PROC_FS
1296 /* proc_dir_entry for /proc/net/ipconfig */
1297 static struct proc_dir_entry *ipconfig_dir;
1298
1299 /* Name servers: */
pnp_seq_show(struct seq_file * seq,void * v)1300 static int pnp_seq_show(struct seq_file *seq, void *v)
1301 {
1302 int i;
1303
1304 if (ic_proto_used & IC_PROTO)
1305 seq_printf(seq, "#PROTO: %s\n",
1306 (ic_proto_used & IC_RARP) ? "RARP"
1307 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1308 else
1309 seq_puts(seq, "#MANUAL\n");
1310
1311 if (ic_domain[0])
1312 seq_printf(seq,
1313 "domain %s\n", ic_domain);
1314 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1315 if (ic_nameservers[i] != NONE)
1316 seq_printf(seq, "nameserver %pI4\n",
1317 &ic_nameservers[i]);
1318 }
1319 if (ic_servaddr != NONE)
1320 seq_printf(seq, "bootserver %pI4\n",
1321 &ic_servaddr);
1322 return 0;
1323 }
1324
1325 /* Create the /proc/net/ipconfig directory */
ipconfig_proc_net_init(void)1326 static int __init ipconfig_proc_net_init(void)
1327 {
1328 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net);
1329 if (!ipconfig_dir)
1330 return -ENOMEM;
1331
1332 return 0;
1333 }
1334
1335 /* Create a new file under /proc/net/ipconfig */
ipconfig_proc_net_create(const char * name,const struct file_operations * fops)1336 static int ipconfig_proc_net_create(const char *name,
1337 const struct file_operations *fops)
1338 {
1339 char *pname;
1340 struct proc_dir_entry *p;
1341
1342 if (!ipconfig_dir)
1343 return -ENOMEM;
1344
1345 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name);
1346 if (!pname)
1347 return -ENOMEM;
1348
1349 p = proc_create(pname, 0444, init_net.proc_net, fops);
1350 kfree(pname);
1351 if (!p)
1352 return -ENOMEM;
1353
1354 return 0;
1355 }
1356
1357 /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */
ntp_servers_seq_show(struct seq_file * seq,void * v)1358 static int ntp_servers_seq_show(struct seq_file *seq, void *v)
1359 {
1360 int i;
1361
1362 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) {
1363 if (ic_ntp_servers[i] != NONE)
1364 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]);
1365 }
1366 return 0;
1367 }
1368 DEFINE_SHOW_ATTRIBUTE(ntp_servers_seq);
1369 #endif /* CONFIG_PROC_FS */
1370
1371 /*
1372 * Extract IP address from the parameter string if needed. Note that we
1373 * need to have root_server_addr set _before_ IPConfig gets called as it
1374 * can override it.
1375 */
root_nfs_parse_addr(char * name)1376 __be32 __init root_nfs_parse_addr(char *name)
1377 {
1378 __be32 addr;
1379 int octets = 0;
1380 char *cp, *cq;
1381
1382 cp = cq = name;
1383 while (octets < 4) {
1384 while (*cp >= '0' && *cp <= '9')
1385 cp++;
1386 if (cp == cq || cp - cq > 3)
1387 break;
1388 if (*cp == '.' || octets == 3)
1389 octets++;
1390 if (octets < 4)
1391 cp++;
1392 cq = cp;
1393 }
1394 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1395 if (*cp == ':')
1396 *cp++ = '\0';
1397 addr = in_aton(name);
1398 memmove(name, cp, strlen(cp) + 1);
1399 } else
1400 addr = NONE;
1401
1402 return addr;
1403 }
1404
1405 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1406
wait_for_devices(void)1407 static int __init wait_for_devices(void)
1408 {
1409 int i;
1410
1411 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1412 struct net_device *dev;
1413 int found = 0;
1414
1415 rtnl_lock();
1416 for_each_netdev(&init_net, dev) {
1417 if (ic_is_init_dev(dev)) {
1418 found = 1;
1419 break;
1420 }
1421 }
1422 rtnl_unlock();
1423 if (found)
1424 return 0;
1425 ssleep(1);
1426 }
1427 return -ENODEV;
1428 }
1429
1430 /*
1431 * IP Autoconfig dispatcher.
1432 */
1433
ip_auto_config(void)1434 static int __init ip_auto_config(void)
1435 {
1436 __be32 addr;
1437 #ifdef IPCONFIG_DYNAMIC
1438 int retries = CONF_OPEN_RETRIES;
1439 #endif
1440 int err;
1441 unsigned int i;
1442
1443 /* Initialise all name servers and NTP servers to NONE (but only if the
1444 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded,
1445 * otherwise we'll overwrite the IP addresses specified there)
1446 */
1447 if (ic_set_manually == 0) {
1448 ic_nameservers_predef();
1449 ic_ntp_servers_predef();
1450 }
1451
1452 #ifdef CONFIG_PROC_FS
1453 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show);
1454
1455 if (ipconfig_proc_net_init() == 0)
1456 ipconfig_proc_net_create("ntp_servers", &ntp_servers_seq_fops);
1457 #endif /* CONFIG_PROC_FS */
1458
1459 if (!ic_enable)
1460 return 0;
1461
1462 pr_debug("IP-Config: Entered.\n");
1463 #ifdef IPCONFIG_DYNAMIC
1464 try_try_again:
1465 #endif
1466 /* Wait for devices to appear */
1467 err = wait_for_devices();
1468 if (err)
1469 return err;
1470
1471 /* Setup all network devices */
1472 err = ic_open_devs();
1473 if (err)
1474 return err;
1475
1476 /* Give drivers a chance to settle */
1477 msleep(CONF_POST_OPEN);
1478
1479 /*
1480 * If the config information is insufficient (e.g., our IP address or
1481 * IP address of the boot server is missing or we have multiple network
1482 * interfaces and no default was set), use BOOTP or RARP to get the
1483 * missing values.
1484 */
1485 if (ic_myaddr == NONE ||
1486 #ifdef CONFIG_ROOT_NFS
1487 (root_server_addr == NONE &&
1488 ic_servaddr == NONE &&
1489 ROOT_DEV == Root_NFS) ||
1490 #endif
1491 ic_first_dev->next) {
1492 #ifdef IPCONFIG_DYNAMIC
1493 if (ic_dynamic() < 0) {
1494 ic_close_devs();
1495
1496 /*
1497 * I don't know why, but sometimes the
1498 * eepro100 driver (at least) gets upset and
1499 * doesn't work the first time it's opened.
1500 * But then if you close it and reopen it, it
1501 * works just fine. So we need to try that at
1502 * least once before giving up.
1503 *
1504 * Also, if the root will be NFS-mounted, we
1505 * have nowhere to go if DHCP fails. So we
1506 * just have to keep trying forever.
1507 *
1508 * -- Chip
1509 */
1510 #ifdef CONFIG_ROOT_NFS
1511 if (ROOT_DEV == Root_NFS) {
1512 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1513 goto try_try_again;
1514 }
1515 #endif
1516
1517 if (--retries) {
1518 pr_err("IP-Config: Reopening network devices...\n");
1519 goto try_try_again;
1520 }
1521
1522 /* Oh, well. At least we tried. */
1523 pr_err("IP-Config: Auto-configuration of network failed\n");
1524 return -1;
1525 }
1526 #else /* !DYNAMIC */
1527 pr_err("IP-Config: Incomplete network configuration information\n");
1528 ic_close_devs();
1529 return -1;
1530 #endif /* IPCONFIG_DYNAMIC */
1531 } else {
1532 /* Device selected manually or only one device -> use it */
1533 ic_dev = ic_first_dev;
1534 }
1535
1536 addr = root_nfs_parse_addr(root_server_path);
1537 if (root_server_addr == NONE)
1538 root_server_addr = addr;
1539
1540 /*
1541 * Use defaults wherever applicable.
1542 */
1543 if (ic_defaults() < 0)
1544 return -1;
1545
1546 /*
1547 * Record which protocol was actually used.
1548 */
1549 #ifdef IPCONFIG_DYNAMIC
1550 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1551 #endif
1552
1553 #ifndef IPCONFIG_SILENT
1554 /*
1555 * Clue in the operator.
1556 */
1557 pr_info("IP-Config: Complete:\n");
1558
1559 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1560 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1561 &ic_myaddr, &ic_netmask, &ic_gateway);
1562 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1563 utsname()->nodename, ic_domain, utsname()->domainname);
1564 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1565 &ic_servaddr, &root_server_addr, root_server_path);
1566 if (ic_dev_mtu)
1567 pr_cont(", mtu=%d", ic_dev_mtu);
1568 /* Name servers (if any): */
1569 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1570 if (ic_nameservers[i] != NONE) {
1571 if (i == 0)
1572 pr_info(" nameserver%u=%pI4",
1573 i, &ic_nameservers[i]);
1574 else
1575 pr_cont(", nameserver%u=%pI4",
1576 i, &ic_nameservers[i]);
1577 }
1578 if (i + 1 == CONF_NAMESERVERS_MAX)
1579 pr_cont("\n");
1580 }
1581 /* NTP servers (if any): */
1582 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) {
1583 if (ic_ntp_servers[i] != NONE) {
1584 if (i == 0)
1585 pr_info(" ntpserver%u=%pI4",
1586 i, &ic_ntp_servers[i]);
1587 else
1588 pr_cont(", ntpserver%u=%pI4",
1589 i, &ic_ntp_servers[i]);
1590 }
1591 if (i + 1 == CONF_NTP_SERVERS_MAX)
1592 pr_cont("\n");
1593 }
1594 #endif /* !SILENT */
1595
1596 /*
1597 * Close all network devices except the device we've
1598 * autoconfigured and set up routes.
1599 */
1600 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1601 err = -1;
1602 else
1603 err = 0;
1604
1605 ic_close_devs();
1606
1607 return err;
1608 }
1609
1610 late_initcall(ip_auto_config);
1611
1612
1613 /*
1614 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1615 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1616 */
ic_proto_name(char * name)1617 static int __init ic_proto_name(char *name)
1618 {
1619 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1620 return 1;
1621 }
1622 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1623 return 0;
1624 }
1625 #ifdef CONFIG_IP_PNP_DHCP
1626 else if (!strncmp(name, "dhcp", 4)) {
1627 char *client_id;
1628
1629 ic_proto_enabled &= ~IC_RARP;
1630 client_id = strstr(name, "dhcp,");
1631 if (client_id) {
1632 char *v;
1633
1634 client_id = client_id + 5;
1635 v = strchr(client_id, ',');
1636 if (!v)
1637 return 1;
1638 *v = 0;
1639 if (kstrtou8(client_id, 0, dhcp_client_identifier))
1640 pr_debug("DHCP: Invalid client identifier type\n");
1641 strncpy(dhcp_client_identifier + 1, v + 1, 251);
1642 *v = ',';
1643 }
1644 return 1;
1645 }
1646 #endif
1647 #ifdef CONFIG_IP_PNP_BOOTP
1648 else if (!strcmp(name, "bootp")) {
1649 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1650 return 1;
1651 }
1652 #endif
1653 #ifdef CONFIG_IP_PNP_RARP
1654 else if (!strcmp(name, "rarp")) {
1655 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1656 return 1;
1657 }
1658 #endif
1659 #ifdef IPCONFIG_DYNAMIC
1660 else if (!strcmp(name, "both")) {
1661 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1662 return 1;
1663 }
1664 #endif
1665 return 0;
1666 }
1667
ip_auto_config_setup(char * addrs)1668 static int __init ip_auto_config_setup(char *addrs)
1669 {
1670 char *cp, *ip, *dp;
1671 int num = 0;
1672
1673 ic_set_manually = 1;
1674 ic_enable = 1;
1675
1676 /*
1677 * If any dhcp, bootp etc options are set, leave autoconfig on
1678 * and skip the below static IP processing.
1679 */
1680 if (ic_proto_name(addrs))
1681 return 1;
1682
1683 /* If no static IP is given, turn off autoconfig and bail. */
1684 if (*addrs == 0 ||
1685 strcmp(addrs, "off") == 0 ||
1686 strcmp(addrs, "none") == 0) {
1687 ic_enable = 0;
1688 return 1;
1689 }
1690
1691 /* Initialise all name servers and NTP servers to NONE */
1692 ic_nameservers_predef();
1693 ic_ntp_servers_predef();
1694
1695 /* Parse string for static IP assignment. */
1696 ip = addrs;
1697 while (ip && *ip) {
1698 if ((cp = strchr(ip, ':')))
1699 *cp++ = '\0';
1700 if (strlen(ip) > 0) {
1701 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1702 switch (num) {
1703 case 0:
1704 if ((ic_myaddr = in_aton(ip)) == ANY)
1705 ic_myaddr = NONE;
1706 break;
1707 case 1:
1708 if ((ic_servaddr = in_aton(ip)) == ANY)
1709 ic_servaddr = NONE;
1710 break;
1711 case 2:
1712 if ((ic_gateway = in_aton(ip)) == ANY)
1713 ic_gateway = NONE;
1714 break;
1715 case 3:
1716 if ((ic_netmask = in_aton(ip)) == ANY)
1717 ic_netmask = NONE;
1718 break;
1719 case 4:
1720 if ((dp = strchr(ip, '.'))) {
1721 *dp++ = '\0';
1722 strlcpy(utsname()->domainname, dp,
1723 sizeof(utsname()->domainname));
1724 }
1725 strlcpy(utsname()->nodename, ip,
1726 sizeof(utsname()->nodename));
1727 ic_host_name_set = 1;
1728 break;
1729 case 5:
1730 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1731 break;
1732 case 6:
1733 if (ic_proto_name(ip) == 0 &&
1734 ic_myaddr == NONE) {
1735 ic_enable = 0;
1736 }
1737 break;
1738 case 7:
1739 if (CONF_NAMESERVERS_MAX >= 1) {
1740 ic_nameservers[0] = in_aton(ip);
1741 if (ic_nameservers[0] == ANY)
1742 ic_nameservers[0] = NONE;
1743 }
1744 break;
1745 case 8:
1746 if (CONF_NAMESERVERS_MAX >= 2) {
1747 ic_nameservers[1] = in_aton(ip);
1748 if (ic_nameservers[1] == ANY)
1749 ic_nameservers[1] = NONE;
1750 }
1751 break;
1752 case 9:
1753 if (CONF_NTP_SERVERS_MAX >= 1) {
1754 ic_ntp_servers[0] = in_aton(ip);
1755 if (ic_ntp_servers[0] == ANY)
1756 ic_ntp_servers[0] = NONE;
1757 }
1758 break;
1759 }
1760 }
1761 ip = cp;
1762 num++;
1763 }
1764
1765 return 1;
1766 }
1767 __setup("ip=", ip_auto_config_setup);
1768
nfsaddrs_config_setup(char * addrs)1769 static int __init nfsaddrs_config_setup(char *addrs)
1770 {
1771 return ip_auto_config_setup(addrs);
1772 }
1773 __setup("nfsaddrs=", nfsaddrs_config_setup);
1774
vendor_class_identifier_setup(char * addrs)1775 static int __init vendor_class_identifier_setup(char *addrs)
1776 {
1777 if (strlcpy(vendor_class_identifier, addrs,
1778 sizeof(vendor_class_identifier))
1779 >= sizeof(vendor_class_identifier))
1780 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1781 vendor_class_identifier);
1782 return 1;
1783 }
1784 __setup("dhcpclass=", vendor_class_identifier_setup);
1785
set_carrier_timeout(char * str)1786 static int __init set_carrier_timeout(char *str)
1787 {
1788 ssize_t ret;
1789
1790 if (!str)
1791 return 0;
1792
1793 ret = kstrtouint(str, 0, &carrier_timeout);
1794 if (ret)
1795 return 0;
1796
1797 return 1;
1798 }
1799 __setup("carrier_timeout=", set_carrier_timeout);
1800
