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/ip.h>
65 #include <net/ipconfig.h>
66 #include <net/route.h>
67
68 #include <linux/uaccess.h>
69 #include <net/checksum.h>
70 #include <asm/processor.h>
71
72 #if defined(CONFIG_IP_PNP_DHCP)
73 #define IPCONFIG_DHCP
74 #endif
75 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
76 #define IPCONFIG_BOOTP
77 #endif
78 #if defined(CONFIG_IP_PNP_RARP)
79 #define IPCONFIG_RARP
80 #endif
81 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
82 #define IPCONFIG_DYNAMIC
83 #endif
84
85 /* Define the friendly delay before and after opening net devices */
86 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
87
88 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
89 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
90 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
91 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
92 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
93 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
94 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
95 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
96 - '3' from resolv.h */
97 #define CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */
98
99 #define NONE cpu_to_be32(INADDR_NONE)
100 #define ANY cpu_to_be32(INADDR_ANY)
101
102 /* Wait for carrier timeout default in seconds */
103 static unsigned int carrier_timeout = 120;
104
105 /*
106 * Public IP configuration
107 */
108
109 /* This is used by platforms which might be able to set the ipconfig
110 * variables using firmware environment vars. If this is set, it will
111 * ignore such firmware variables.
112 */
113 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
114
115 static int ic_enable __initdata; /* IP config enabled? */
116
117 /* Protocol choice */
118 int ic_proto_enabled __initdata = 0
119 #ifdef IPCONFIG_BOOTP
120 | IC_BOOTP
121 #endif
122 #ifdef CONFIG_IP_PNP_DHCP
123 | IC_USE_DHCP
124 #endif
125 #ifdef IPCONFIG_RARP
126 | IC_RARP
127 #endif
128 ;
129
130 static int ic_host_name_set __initdata; /* Host name set by us? */
131
132 __be32 ic_myaddr = NONE; /* My IP address */
133 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
134 __be32 ic_gateway = NONE; /* Gateway IP address */
135
136 #ifdef IPCONFIG_DYNAMIC
137 static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */
138 #endif
139
140 __be32 ic_servaddr = NONE; /* Boot server IP address */
141
142 __be32 root_server_addr = NONE; /* Address of NFS server */
143 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
144
145 /* vendor class identifier */
146 static char vendor_class_identifier[253] __initdata;
147
148 #if defined(CONFIG_IP_PNP_DHCP)
149 static char dhcp_client_identifier[253] __initdata;
150 #endif
151
152 /* Persistent data: */
153
154 #ifdef IPCONFIG_DYNAMIC
155 static int ic_proto_used; /* Protocol used, if any */
156 #else
157 #define ic_proto_used 0
158 #endif
159 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
160 static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */
161 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
162
163 /*
164 * Private state.
165 */
166
167 /* Name of user-selected boot device */
168 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
169
170 /* Protocols supported by available interfaces */
171 static int ic_proto_have_if __initdata;
172
173 /* MTU for boot device */
174 static int ic_dev_mtu __initdata;
175
176 #ifdef IPCONFIG_DYNAMIC
177 static DEFINE_SPINLOCK(ic_recv_lock);
178 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */
179 #endif
180 #ifdef IPCONFIG_DHCP
181 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */
182 #endif
183
184
185 /*
186 * Network devices
187 */
188
189 struct ic_device {
190 struct ic_device *next;
191 struct net_device *dev;
192 unsigned short flags;
193 short able;
194 __be32 xid;
195 };
196
197 static struct ic_device *ic_first_dev __initdata; /* List of open device */
198 static struct ic_device *ic_dev __initdata; /* Selected device */
199
ic_is_init_dev(struct net_device * dev)200 static bool __init ic_is_init_dev(struct net_device *dev)
201 {
202 if (dev->flags & IFF_LOOPBACK)
203 return false;
204 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
205 (!(dev->flags & IFF_LOOPBACK) &&
206 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
207 strncmp(dev->name, "dummy", 5));
208 }
209
ic_open_devs(void)210 static int __init ic_open_devs(void)
211 {
212 struct ic_device *d, **last;
213 struct net_device *dev;
214 unsigned short oflags;
215 unsigned long start, next_msg;
216
217 last = &ic_first_dev;
218 rtnl_lock();
219
220 /* bring loopback device up first */
221 for_each_netdev(&init_net, dev) {
222 if (!(dev->flags & IFF_LOOPBACK))
223 continue;
224 if (dev_change_flags(dev, dev->flags | IFF_UP, NULL) < 0)
225 pr_err("IP-Config: Failed to open %s\n", dev->name);
226 }
227
228 for_each_netdev(&init_net, dev) {
229 if (ic_is_init_dev(dev)) {
230 int able = 0;
231 if (dev->mtu >= 364)
232 able |= IC_BOOTP;
233 else
234 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
235 dev->name, dev->mtu);
236 if (!(dev->flags & IFF_NOARP))
237 able |= IC_RARP;
238 able &= ic_proto_enabled;
239 if (ic_proto_enabled && !able)
240 continue;
241 oflags = dev->flags;
242 if (dev_change_flags(dev, oflags | IFF_UP, NULL) < 0) {
243 pr_err("IP-Config: Failed to open %s\n",
244 dev->name);
245 continue;
246 }
247 if (!(d = kmalloc_obj(struct ic_device))) {
248 rtnl_unlock();
249 return -ENOMEM;
250 }
251 d->dev = dev;
252 *last = d;
253 last = &d->next;
254 d->flags = oflags;
255 d->able = able;
256 if (able & IC_BOOTP)
257 get_random_bytes(&d->xid, sizeof(__be32));
258 else
259 d->xid = 0;
260 ic_proto_have_if |= able;
261 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
262 dev->name, able, d->xid);
263 }
264 }
265 /* Devices with a complex topology like SFP ethernet interfaces needs
266 * the rtnl_lock at init. The carrier wait-loop must therefore run
267 * without holding it.
268 */
269 rtnl_unlock();
270
271 /* no point in waiting if we could not bring up at least one device */
272 if (!ic_first_dev)
273 goto have_carrier;
274
275 /* wait for a carrier on at least one device */
276 start = jiffies;
277 next_msg = start + secs_to_jiffies(20);
278 while (time_before(jiffies, start +
279 secs_to_jiffies(carrier_timeout))) {
280 int wait, elapsed;
281
282 rtnl_lock();
283 for_each_netdev(&init_net, dev)
284 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) {
285 rtnl_unlock();
286 goto have_carrier;
287 }
288 rtnl_unlock();
289
290 msleep(1);
291
292 if (time_before(jiffies, next_msg))
293 continue;
294
295 elapsed = jiffies_to_msecs(jiffies - start);
296 wait = (carrier_timeout * 1000 - elapsed + 500) / 1000;
297 pr_info("Waiting up to %d more seconds for network.\n", wait);
298 next_msg = jiffies + secs_to_jiffies(20);
299 }
300 have_carrier:
301
302 *last = NULL;
303
304 if (!ic_first_dev) {
305 if (user_dev_name[0])
306 pr_err("IP-Config: Device `%s' not found\n",
307 user_dev_name);
308 else
309 pr_err("IP-Config: No network devices available\n");
310 return -ENODEV;
311 }
312 return 0;
313 }
314
315 /* Close all network interfaces except the one we've autoconfigured, and its
316 * lowers, in case it's a stacked virtual interface.
317 */
ic_close_devs(void)318 static void __init ic_close_devs(void)
319 {
320 struct net_device *selected_dev = ic_dev ? ic_dev->dev : NULL;
321 struct ic_device *d, *next;
322 struct net_device *dev;
323
324 rtnl_lock();
325 next = ic_first_dev;
326 while ((d = next)) {
327 bool bring_down = (d != ic_dev);
328 struct net_device *lower;
329 struct list_head *iter;
330
331 next = d->next;
332 dev = d->dev;
333
334 if (selected_dev) {
335 netdev_for_each_lower_dev(selected_dev, lower, iter) {
336 if (dev == lower) {
337 bring_down = false;
338 break;
339 }
340 }
341 }
342 if (bring_down) {
343 pr_debug("IP-Config: Downing %s\n", dev->name);
344 dev_change_flags(dev, d->flags, NULL);
345 }
346 kfree(d);
347 }
348 rtnl_unlock();
349 }
350
351 /*
352 * Interface to various network functions.
353 */
354
355 static inline void
set_sockaddr(struct sockaddr_in * sin,__be32 addr,__be16 port)356 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
357 {
358 sin->sin_family = AF_INET;
359 sin->sin_addr.s_addr = addr;
360 sin->sin_port = port;
361 }
362
363 /*
364 * Set up interface addresses and routes.
365 */
366
ic_setup_if(void)367 static int __init ic_setup_if(void)
368 {
369 struct ifreq ir;
370 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
371 int err;
372
373 memset(&ir, 0, sizeof(ir));
374 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name);
375 set_sockaddr(sin, ic_myaddr, 0);
376 if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) {
377 pr_err("IP-Config: Unable to set interface address (%d)\n",
378 err);
379 return -1;
380 }
381 set_sockaddr(sin, ic_netmask, 0);
382 if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) {
383 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
384 err);
385 return -1;
386 }
387 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
388 if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) {
389 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
390 err);
391 return -1;
392 }
393 /* Handle the case where we need non-standard MTU on the boot link (a network
394 * using jumbo frames, for instance). If we can't set the mtu, don't error
395 * out, we'll try to muddle along.
396 */
397 if (ic_dev_mtu != 0) {
398 rtnl_lock();
399 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0)
400 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
401 ic_dev_mtu, err);
402 rtnl_unlock();
403 }
404 return 0;
405 }
406
ic_setup_routes(void)407 static int __init ic_setup_routes(void)
408 {
409 /* No need to setup device routes, only the default route... */
410
411 if (ic_gateway != NONE) {
412 struct rtentry rm;
413 int err;
414
415 memset(&rm, 0, sizeof(rm));
416 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
417 pr_err("IP-Config: Gateway not on directly connected network\n");
418 return -1;
419 }
420 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
421 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
422 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
423 rm.rt_flags = RTF_UP | RTF_GATEWAY;
424 if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) {
425 pr_err("IP-Config: Cannot add default route (%d)\n",
426 err);
427 return -1;
428 }
429 }
430
431 return 0;
432 }
433
434 /*
435 * Fill in default values for all missing parameters.
436 */
437
ic_defaults(void)438 static int __init ic_defaults(void)
439 {
440 /*
441 * At this point we have no userspace running so need not
442 * claim locks on system_utsname
443 */
444
445 if (!ic_host_name_set)
446 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
447
448 if (root_server_addr == NONE)
449 root_server_addr = ic_servaddr;
450
451 if (ic_netmask == NONE) {
452 if (IN_CLASSA(ntohl(ic_myaddr)))
453 ic_netmask = htonl(IN_CLASSA_NET);
454 else if (IN_CLASSB(ntohl(ic_myaddr)))
455 ic_netmask = htonl(IN_CLASSB_NET);
456 else if (IN_CLASSC(ntohl(ic_myaddr)))
457 ic_netmask = htonl(IN_CLASSC_NET);
458 else if (IN_CLASSE(ntohl(ic_myaddr)))
459 ic_netmask = htonl(IN_CLASSE_NET);
460 else {
461 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
462 &ic_myaddr);
463 return -1;
464 }
465 pr_notice("IP-Config: Guessing netmask %pI4\n",
466 &ic_netmask);
467 }
468
469 return 0;
470 }
471
472 /*
473 * RARP support.
474 */
475
476 #ifdef IPCONFIG_RARP
477
478 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
479
480 static struct packet_type rarp_packet_type __initdata = {
481 .type = cpu_to_be16(ETH_P_RARP),
482 .func = ic_rarp_recv,
483 };
484
ic_rarp_init(void)485 static inline void __init ic_rarp_init(void)
486 {
487 dev_add_pack(&rarp_packet_type);
488 }
489
ic_rarp_cleanup(void)490 static inline void __init ic_rarp_cleanup(void)
491 {
492 dev_remove_pack(&rarp_packet_type);
493 }
494
495 /*
496 * Process received RARP packet.
497 */
498 static int __init
ic_rarp_recv(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * orig_dev)499 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
500 {
501 struct arphdr *rarp;
502 unsigned char *rarp_ptr;
503 __be32 sip, tip;
504 unsigned char *tha; /* t for "target" */
505 struct ic_device *d;
506
507 if (!net_eq(dev_net(dev), &init_net))
508 goto drop;
509
510 skb = skb_share_check(skb, GFP_ATOMIC);
511 if (!skb)
512 return NET_RX_DROP;
513
514 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
515 goto drop;
516
517 /* Basic sanity checks can be done without the lock. */
518 rarp = (struct arphdr *)skb_transport_header(skb);
519
520 /* If this test doesn't pass, it's not IP, or we should
521 * ignore it anyway.
522 */
523 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
524 goto drop;
525
526 /* If it's not a RARP reply, delete it. */
527 if (rarp->ar_op != htons(ARPOP_RREPLY))
528 goto drop;
529
530 /* If it's not Ethernet, delete it. */
531 if (rarp->ar_pro != htons(ETH_P_IP))
532 goto drop;
533
534 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
535 goto drop;
536
537 /* OK, it is all there and looks valid, process... */
538 rarp = (struct arphdr *)skb_transport_header(skb);
539 rarp_ptr = (unsigned char *) (rarp + 1);
540
541 /* One reply at a time, please. */
542 spin_lock(&ic_recv_lock);
543
544 /* If we already have a reply, just drop the packet */
545 if (ic_got_reply)
546 goto drop_unlock;
547
548 /* Find the ic_device that the packet arrived on */
549 d = ic_first_dev;
550 while (d && d->dev != dev)
551 d = d->next;
552 if (!d)
553 goto drop_unlock; /* should never happen */
554
555 /* Extract variable-width fields */
556 rarp_ptr += dev->addr_len;
557 memcpy(&sip, rarp_ptr, 4);
558 rarp_ptr += 4;
559 tha = rarp_ptr;
560 rarp_ptr += dev->addr_len;
561 memcpy(&tip, rarp_ptr, 4);
562
563 /* Discard packets which are not meant for us. */
564 if (memcmp(tha, dev->dev_addr, dev->addr_len))
565 goto drop_unlock;
566
567 /* Discard packets which are not from specified server. */
568 if (ic_servaddr != NONE && ic_servaddr != sip)
569 goto drop_unlock;
570
571 /* We have a winner! */
572 ic_dev = d;
573 if (ic_myaddr == NONE)
574 ic_myaddr = tip;
575 ic_servaddr = sip;
576 ic_addrservaddr = sip;
577 ic_got_reply = IC_RARP;
578
579 drop_unlock:
580 /* Show's over. Nothing to see here. */
581 spin_unlock(&ic_recv_lock);
582
583 drop:
584 /* Throw the packet out. */
585 kfree_skb(skb);
586 return 0;
587 }
588
589
590 /*
591 * Send RARP request packet over a single interface.
592 */
ic_rarp_send_if(struct ic_device * d)593 static void __init ic_rarp_send_if(struct ic_device *d)
594 {
595 struct net_device *dev = d->dev;
596 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
597 dev->dev_addr, dev->dev_addr);
598 }
599 #endif
600
601 /*
602 * Predefine Nameservers
603 */
ic_nameservers_predef(void)604 static inline void __init ic_nameservers_predef(void)
605 {
606 int i;
607
608 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
609 ic_nameservers[i] = NONE;
610 }
611
612 /* Predefine NTP servers */
ic_ntp_servers_predef(void)613 static inline void __init ic_ntp_servers_predef(void)
614 {
615 int i;
616
617 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++)
618 ic_ntp_servers[i] = NONE;
619 }
620
621 /*
622 * DHCP/BOOTP support.
623 */
624
625 #ifdef IPCONFIG_BOOTP
626
627 struct bootp_pkt { /* BOOTP packet format */
628 struct iphdr iph; /* IP header */
629 struct udphdr udph; /* UDP header */
630 u8 op; /* 1=request, 2=reply */
631 u8 htype; /* HW address type */
632 u8 hlen; /* HW address length */
633 u8 hops; /* Used only by gateways */
634 __be32 xid; /* Transaction ID */
635 __be16 secs; /* Seconds since we started */
636 __be16 flags; /* Just what it says */
637 __be32 client_ip; /* Client's IP address if known */
638 __be32 your_ip; /* Assigned IP address */
639 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
640 __be32 relay_ip; /* IP address of BOOTP relay */
641 u8 hw_addr[16]; /* Client's HW address */
642 u8 serv_name[64]; /* Server host name */
643 u8 boot_file[128]; /* Name of boot file */
644 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
645 };
646
647 /* packet ops */
648 #define BOOTP_REQUEST 1
649 #define BOOTP_REPLY 2
650
651 /* DHCP message types */
652 #define DHCPDISCOVER 1
653 #define DHCPOFFER 2
654 #define DHCPREQUEST 3
655 #define DHCPDECLINE 4
656 #define DHCPACK 5
657 #define DHCPNAK 6
658 #define DHCPRELEASE 7
659 #define DHCPINFORM 8
660
661 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
662
663 static struct packet_type bootp_packet_type __initdata = {
664 .type = cpu_to_be16(ETH_P_IP),
665 .func = ic_bootp_recv,
666 };
667
668 /* DHCPACK can overwrite DNS if fallback was set upon first BOOTP reply */
669 static int ic_nameservers_fallback __initdata;
670
671 /*
672 * Initialize DHCP/BOOTP extension fields in the request.
673 */
674
675 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
676
677 #ifdef IPCONFIG_DHCP
678
679 static void __init
ic_dhcp_init_options(u8 * options,struct ic_device * d)680 ic_dhcp_init_options(u8 *options, struct ic_device *d)
681 {
682 static const u8 ic_req_params[] = {
683 1, /* Subnet mask */
684 3, /* Default gateway */
685 6, /* DNS server */
686 12, /* Host name */
687 15, /* Domain name */
688 17, /* Boot path */
689 26, /* MTU */
690 40, /* NIS domain name */
691 42, /* NTP servers */
692 };
693 u8 mt = (ic_servaddr == NONE) ? DHCPDISCOVER : DHCPREQUEST;
694 u8 *e = options;
695 int len;
696
697 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);
698
699 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
700 e += 4;
701
702 *e++ = 53; /* DHCP message type */
703 *e++ = 1;
704 *e++ = mt;
705
706 if (mt == DHCPREQUEST) {
707 *e++ = 54; /* Server ID (IP address) */
708 *e++ = 4;
709 memcpy(e, &ic_servaddr, 4);
710 e += 4;
711
712 *e++ = 50; /* Requested IP address */
713 *e++ = 4;
714 memcpy(e, &ic_myaddr, 4);
715 e += 4;
716 }
717
718 *e++ = 55; /* Parameter request list */
719 *e++ = sizeof(ic_req_params);
720 memcpy(e, ic_req_params, sizeof(ic_req_params));
721 e += sizeof(ic_req_params);
722
723 if (ic_host_name_set) {
724 *e++ = 12; /* host-name */
725 len = strlen(utsname()->nodename);
726 *e++ = len;
727 memcpy(e, utsname()->nodename, len);
728 e += len;
729 }
730 if (*vendor_class_identifier) {
731 pr_info("DHCP: sending class identifier \"%s\"\n",
732 vendor_class_identifier);
733 *e++ = 60; /* Class-identifier */
734 len = strlen(vendor_class_identifier);
735 *e++ = len;
736 memcpy(e, vendor_class_identifier, len);
737 e += len;
738 }
739 len = strlen(dhcp_client_identifier + 1);
740 /* the minimum length of identifier is 2, include 1 byte type,
741 * and can not be larger than the length of options
742 */
743 if (len >= 1 && len < 312 - (e - options) - 1) {
744 *e++ = 61;
745 *e++ = len + 1;
746 memcpy(e, dhcp_client_identifier, len + 1);
747 e += len + 1;
748 }
749
750 *e++ = 255; /* End of the list */
751 }
752
753 #endif /* IPCONFIG_DHCP */
754
ic_bootp_init_ext(u8 * e)755 static void __init ic_bootp_init_ext(u8 *e)
756 {
757 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
758 e += 4;
759 *e++ = 1; /* Subnet mask request */
760 *e++ = 4;
761 e += 4;
762 *e++ = 3; /* Default gateway request */
763 *e++ = 4;
764 e += 4;
765 #if CONF_NAMESERVERS_MAX > 0
766 *e++ = 6; /* (DNS) name server request */
767 *e++ = 4 * CONF_NAMESERVERS_MAX;
768 e += 4 * CONF_NAMESERVERS_MAX;
769 #endif
770 *e++ = 12; /* Host name request */
771 *e++ = 32;
772 e += 32;
773 *e++ = 40; /* NIS Domain name request */
774 *e++ = 32;
775 e += 32;
776 *e++ = 17; /* Boot path */
777 *e++ = 40;
778 e += 40;
779
780 *e++ = 57; /* set extension buffer size for reply */
781 *e++ = 2;
782 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
783 *e++ = 150;
784
785 *e++ = 255; /* End of the list */
786 }
787
788
789 /*
790 * Initialize the DHCP/BOOTP mechanism.
791 */
ic_bootp_init(void)792 static inline void __init ic_bootp_init(void)
793 {
794 /* Re-initialise all name servers and NTP servers to NONE, in case any
795 * were set via the "ip=" or "nfsaddrs=" kernel command line parameters:
796 * any IP addresses specified there will already have been decoded but
797 * are no longer needed
798 */
799 ic_nameservers_predef();
800 ic_ntp_servers_predef();
801
802 dev_add_pack(&bootp_packet_type);
803 }
804
805
806 /*
807 * DHCP/BOOTP cleanup.
808 */
ic_bootp_cleanup(void)809 static inline void __init ic_bootp_cleanup(void)
810 {
811 dev_remove_pack(&bootp_packet_type);
812 }
813
814
815 /*
816 * Send DHCP/BOOTP request to single interface.
817 */
ic_bootp_send_if(struct ic_device * d,unsigned long jiffies_diff)818 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
819 {
820 struct net_device *dev = d->dev;
821 struct sk_buff *skb;
822 struct bootp_pkt *b;
823 struct iphdr *h;
824 int hlen = LL_RESERVED_SPACE(dev);
825 int tlen = dev->needed_tailroom;
826
827 /* Allocate packet */
828 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
829 GFP_KERNEL);
830 if (!skb)
831 return;
832 skb_reserve(skb, hlen);
833 b = skb_put_zero(skb, sizeof(struct bootp_pkt));
834
835 /* Construct IP header */
836 skb_reset_network_header(skb);
837 h = ip_hdr(skb);
838 h->version = 4;
839 h->ihl = 5;
840 h->tot_len = htons(sizeof(struct bootp_pkt));
841 h->frag_off = htons(IP_DF);
842 h->ttl = 64;
843 h->protocol = IPPROTO_UDP;
844 h->daddr = htonl(INADDR_BROADCAST);
845 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
846
847 /* Construct UDP header */
848 b->udph.source = htons(68);
849 b->udph.dest = htons(67);
850 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
851 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
852
853 /* Construct DHCP/BOOTP header */
854 b->op = BOOTP_REQUEST;
855 if (dev->type < 256) /* check for false types */
856 b->htype = dev->type;
857 else if (dev->type == ARPHRD_FDDI)
858 b->htype = ARPHRD_ETHER;
859 else {
860 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
861 dev->name);
862 b->htype = dev->type; /* can cause undefined behavior */
863 }
864
865 /* server_ip and your_ip address are both already zero per RFC2131 */
866 b->hlen = dev->addr_len;
867 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
868 b->secs = htons(jiffies_diff / HZ);
869 b->xid = d->xid;
870
871 /* add DHCP options or BOOTP extensions */
872 #ifdef IPCONFIG_DHCP
873 if (ic_proto_enabled & IC_USE_DHCP)
874 ic_dhcp_init_options(b->exten, d);
875 else
876 #endif
877 ic_bootp_init_ext(b->exten);
878
879 /* Chain packet down the line... */
880 skb->dev = dev;
881 skb->protocol = htons(ETH_P_IP);
882 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
883 dev->broadcast, dev->dev_addr, skb->len) < 0) {
884 kfree_skb(skb);
885 printk("E");
886 return;
887 }
888
889 if (dev_queue_xmit(skb) < 0)
890 printk("E");
891 }
892
893
894 /*
895 * Copy BOOTP-supplied string
896 */
ic_bootp_string(char * dest,char * src,int len,int max)897 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
898 {
899 if (!len)
900 return 0;
901 if (len > max-1)
902 len = max-1;
903 memcpy(dest, src, len);
904 dest[len] = '\0';
905 return 1;
906 }
907
908
909 /*
910 * Process BOOTP extensions.
911 */
ic_do_bootp_ext(u8 * ext)912 static void __init ic_do_bootp_ext(u8 *ext)
913 {
914 u8 servers;
915 int i;
916 __be16 mtu;
917
918 u8 *c;
919
920 pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
921 for (c=ext+2; c<ext+2+ext[1]; c++)
922 pr_debug(" %02x", *c);
923 pr_debug("\n");
924
925 switch (*ext++) {
926 case 1: /* Subnet mask */
927 if (ic_netmask == NONE)
928 memcpy(&ic_netmask, ext+1, 4);
929 break;
930 case 3: /* Default gateway */
931 if (ic_gateway == NONE)
932 memcpy(&ic_gateway, ext+1, 4);
933 break;
934 case 6: /* DNS server */
935 servers= *ext/4;
936 if (servers > CONF_NAMESERVERS_MAX)
937 servers = CONF_NAMESERVERS_MAX;
938 for (i = 0; i < servers; i++) {
939 if (ic_nameservers[i] == NONE ||
940 ic_nameservers_fallback)
941 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
942 }
943 break;
944 case 12: /* Host name */
945 if (!ic_host_name_set) {
946 ic_bootp_string(utsname()->nodename, ext+1, *ext,
947 __NEW_UTS_LEN);
948 ic_host_name_set = 1;
949 }
950 break;
951 case 15: /* Domain name (DNS) */
952 if (!ic_domain[0])
953 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
954 break;
955 case 17: /* Root path */
956 if (!root_server_path[0])
957 ic_bootp_string(root_server_path, ext+1, *ext,
958 sizeof(root_server_path));
959 break;
960 case 26: /* Interface MTU */
961 memcpy(&mtu, ext+1, sizeof(mtu));
962 ic_dev_mtu = ntohs(mtu);
963 break;
964 case 40: /* NIS Domain name (_not_ DNS) */
965 ic_bootp_string(utsname()->domainname, ext+1, *ext,
966 __NEW_UTS_LEN);
967 break;
968 case 42: /* NTP servers */
969 servers = *ext / 4;
970 if (servers > CONF_NTP_SERVERS_MAX)
971 servers = CONF_NTP_SERVERS_MAX;
972 for (i = 0; i < servers; i++) {
973 if (ic_ntp_servers[i] == NONE)
974 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4);
975 }
976 break;
977 }
978 }
979
980
981 /*
982 * Receive BOOTP reply.
983 */
ic_bootp_recv(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * orig_dev)984 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
985 {
986 struct bootp_pkt *b;
987 struct iphdr *h;
988 struct ic_device *d;
989 int len, ext_len;
990
991 if (!net_eq(dev_net(dev), &init_net))
992 goto drop;
993
994 /* Perform verifications before taking the lock. */
995 if (skb->pkt_type == PACKET_OTHERHOST)
996 goto drop;
997
998 skb = skb_share_check(skb, GFP_ATOMIC);
999 if (!skb)
1000 return NET_RX_DROP;
1001
1002 if (!pskb_may_pull(skb,
1003 sizeof(struct iphdr) +
1004 sizeof(struct udphdr)))
1005 goto drop;
1006
1007 b = (struct bootp_pkt *)skb_network_header(skb);
1008 h = &b->iph;
1009
1010 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
1011 goto drop;
1012
1013 /* Fragments are not supported */
1014 if (ip_is_fragment(h)) {
1015 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
1016 goto drop;
1017 }
1018
1019 if (skb->len < ntohs(h->tot_len))
1020 goto drop;
1021
1022 if (ip_fast_csum((char *) h, h->ihl))
1023 goto drop;
1024
1025 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
1026 goto drop;
1027
1028 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1029 goto drop;
1030
1031 len = ntohs(b->udph.len) - sizeof(struct udphdr);
1032 ext_len = len - (sizeof(*b) -
1033 sizeof(struct iphdr) -
1034 sizeof(struct udphdr) -
1035 sizeof(b->exten));
1036 if (ext_len < 0)
1037 goto drop;
1038
1039 /* Ok the front looks good, make sure we can get at the rest. */
1040 if (!pskb_may_pull(skb, skb->len))
1041 goto drop;
1042
1043 b = (struct bootp_pkt *)skb_network_header(skb);
1044 h = &b->iph;
1045
1046 /* One reply at a time, please. */
1047 spin_lock(&ic_recv_lock);
1048
1049 /* If we already have a reply, just drop the packet */
1050 if (ic_got_reply)
1051 goto drop_unlock;
1052
1053 /* Find the ic_device that the packet arrived on */
1054 d = ic_first_dev;
1055 while (d && d->dev != dev)
1056 d = d->next;
1057 if (!d)
1058 goto drop_unlock; /* should never happen */
1059
1060 /* Is it a reply to our BOOTP request? */
1061 if (b->op != BOOTP_REPLY ||
1062 b->xid != d->xid) {
1063 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1064 d->dev->name, b->op, b->xid);
1065 goto drop_unlock;
1066 }
1067
1068 /* Parse extensions */
1069 if (ext_len >= 4 &&
1070 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1071 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1072 u8 *ext;
1073
1074 #ifdef IPCONFIG_DHCP
1075 if (ic_proto_enabled & IC_USE_DHCP) {
1076 __be32 server_id = NONE;
1077 int mt = 0;
1078
1079 ext = &b->exten[4];
1080 while (ext < end && *ext != 0xff) {
1081 u8 *opt = ext++;
1082 if (*opt == 0) /* Padding */
1083 continue;
1084 ext += *ext + 1;
1085 if (ext >= end)
1086 break;
1087 switch (*opt) {
1088 case 53: /* Message type */
1089 if (opt[1])
1090 mt = opt[2];
1091 break;
1092 case 54: /* Server ID (IP address) */
1093 if (opt[1] >= 4)
1094 memcpy(&server_id, opt + 2, 4);
1095 break;
1096 }
1097 }
1098
1099 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1100
1101 switch (mt) {
1102 case DHCPOFFER:
1103 /* While in the process of accepting one offer,
1104 * ignore all others.
1105 */
1106 if (ic_myaddr != NONE)
1107 goto drop_unlock;
1108
1109 /* Let's accept that offer. */
1110 ic_myaddr = b->your_ip;
1111 ic_servaddr = server_id;
1112 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1113 &ic_myaddr, &b->iph.saddr);
1114 /* The DHCP indicated server address takes
1115 * precedence over the bootp header one if
1116 * they are different.
1117 */
1118 if ((server_id != NONE) &&
1119 (b->server_ip != server_id))
1120 b->server_ip = ic_servaddr;
1121 break;
1122
1123 case DHCPACK:
1124 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1125 goto drop_unlock;
1126
1127 /* Yeah! */
1128 break;
1129
1130 default:
1131 /* Urque. Forget it*/
1132 ic_myaddr = NONE;
1133 ic_servaddr = NONE;
1134 goto drop_unlock;
1135 }
1136
1137 ic_dhcp_msgtype = mt;
1138
1139 }
1140 #endif /* IPCONFIG_DHCP */
1141
1142 ext = &b->exten[4];
1143 while (ext < end && *ext != 0xff) {
1144 u8 *opt = ext++;
1145 if (*opt == 0) /* Padding */
1146 continue;
1147 ext += *ext + 1;
1148 if (ext < end)
1149 ic_do_bootp_ext(opt);
1150 }
1151 }
1152
1153 /* We have a winner! */
1154 ic_dev = d;
1155 ic_myaddr = b->your_ip;
1156 ic_servaddr = b->server_ip;
1157 ic_addrservaddr = b->iph.saddr;
1158 if (ic_gateway == NONE && b->relay_ip)
1159 ic_gateway = b->relay_ip;
1160 if (ic_nameservers[0] == NONE) {
1161 ic_nameservers[0] = ic_servaddr;
1162 ic_nameservers_fallback = 1;
1163 }
1164 ic_got_reply = IC_BOOTP;
1165
1166 drop_unlock:
1167 /* Show's over. Nothing to see here. */
1168 spin_unlock(&ic_recv_lock);
1169
1170 drop:
1171 /* Throw the packet out. */
1172 kfree_skb(skb);
1173
1174 return 0;
1175 }
1176
1177
1178 #endif
1179
1180
1181 /*
1182 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1183 */
1184
1185 #ifdef IPCONFIG_DYNAMIC
1186
ic_dynamic(void)1187 static int __init ic_dynamic(void)
1188 {
1189 int retries;
1190 struct ic_device *d;
1191 unsigned long start_jiffies, timeout, jiff;
1192 int do_bootp = ic_proto_have_if & IC_BOOTP;
1193 int do_rarp = ic_proto_have_if & IC_RARP;
1194
1195 /*
1196 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1197 * This routine gets only called when some pieces of information
1198 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1199 */
1200 if (!ic_proto_enabled) {
1201 pr_err("IP-Config: Incomplete network configuration information\n");
1202 return -1;
1203 }
1204
1205 #ifdef IPCONFIG_BOOTP
1206 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1207 pr_err("DHCP/BOOTP: No suitable device found\n");
1208 #endif
1209 #ifdef IPCONFIG_RARP
1210 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1211 pr_err("RARP: No suitable device found\n");
1212 #endif
1213
1214 if (!ic_proto_have_if)
1215 /* Error message already printed */
1216 return -1;
1217
1218 /*
1219 * Setup protocols
1220 */
1221 #ifdef IPCONFIG_BOOTP
1222 if (do_bootp)
1223 ic_bootp_init();
1224 #endif
1225 #ifdef IPCONFIG_RARP
1226 if (do_rarp)
1227 ic_rarp_init();
1228 #endif
1229
1230 /*
1231 * Send requests and wait, until we get an answer. This loop
1232 * seems to be a terrible waste of CPU time, but actually there is
1233 * only one process running at all, so we don't need to use any
1234 * scheduler functions.
1235 * [Actually we could now, but the nothing else running note still
1236 * applies.. - AC]
1237 */
1238 pr_notice("Sending %s%s%s requests .",
1239 do_bootp
1240 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1241 (do_bootp && do_rarp) ? " and " : "",
1242 do_rarp ? "RARP" : "");
1243
1244 start_jiffies = jiffies;
1245 d = ic_first_dev;
1246 retries = CONF_SEND_RETRIES;
1247 get_random_bytes(&timeout, sizeof(timeout));
1248 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1249 for (;;) {
1250 #ifdef IPCONFIG_BOOTP
1251 if (do_bootp && (d->able & IC_BOOTP))
1252 ic_bootp_send_if(d, jiffies - start_jiffies);
1253 #endif
1254 #ifdef IPCONFIG_RARP
1255 if (do_rarp && (d->able & IC_RARP))
1256 ic_rarp_send_if(d);
1257 #endif
1258
1259 if (!d->next) {
1260 jiff = jiffies + timeout;
1261 while (time_before(jiffies, jiff) && !ic_got_reply)
1262 schedule_timeout_uninterruptible(1);
1263 }
1264 #ifdef IPCONFIG_DHCP
1265 /* DHCP isn't done until we get a DHCPACK. */
1266 if ((ic_got_reply & IC_BOOTP) &&
1267 (ic_proto_enabled & IC_USE_DHCP) &&
1268 ic_dhcp_msgtype != DHCPACK) {
1269 ic_got_reply = 0;
1270 /* continue on device that got the reply */
1271 d = ic_dev;
1272 pr_cont(",");
1273 continue;
1274 }
1275 #endif /* IPCONFIG_DHCP */
1276
1277 if (ic_got_reply) {
1278 pr_cont(" OK\n");
1279 break;
1280 }
1281
1282 if ((d = d->next))
1283 continue;
1284
1285 if (! --retries) {
1286 pr_cont(" timed out!\n");
1287 break;
1288 }
1289
1290 d = ic_first_dev;
1291
1292 timeout = timeout CONF_TIMEOUT_MULT;
1293 if (timeout > CONF_TIMEOUT_MAX)
1294 timeout = CONF_TIMEOUT_MAX;
1295
1296 pr_cont(".");
1297 }
1298
1299 #ifdef IPCONFIG_BOOTP
1300 if (do_bootp)
1301 ic_bootp_cleanup();
1302 #endif
1303 #ifdef IPCONFIG_RARP
1304 if (do_rarp)
1305 ic_rarp_cleanup();
1306 #endif
1307
1308 if (!ic_got_reply) {
1309 ic_myaddr = NONE;
1310 return -1;
1311 }
1312
1313 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1314 ((ic_got_reply & IC_RARP) ? "RARP"
1315 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1316 &ic_addrservaddr, &ic_myaddr);
1317
1318 return 0;
1319 }
1320
1321 #endif /* IPCONFIG_DYNAMIC */
1322
1323 #ifdef CONFIG_PROC_FS
1324 /* proc_dir_entry for /proc/net/ipconfig */
1325 static struct proc_dir_entry *ipconfig_dir;
1326
1327 /* Name servers: */
pnp_seq_show(struct seq_file * seq,void * v)1328 static int pnp_seq_show(struct seq_file *seq, void *v)
1329 {
1330 int i;
1331
1332 if (ic_proto_used & IC_PROTO)
1333 seq_printf(seq, "#PROTO: %s\n",
1334 (ic_proto_used & IC_RARP) ? "RARP"
1335 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1336 else
1337 seq_puts(seq, "#MANUAL\n");
1338
1339 if (ic_domain[0])
1340 seq_printf(seq,
1341 "domain %s\n", ic_domain);
1342 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1343 if (ic_nameservers[i] != NONE)
1344 seq_printf(seq, "nameserver %pI4\n",
1345 &ic_nameservers[i]);
1346 }
1347 if (ic_servaddr != NONE)
1348 seq_printf(seq, "bootserver %pI4\n",
1349 &ic_servaddr);
1350 return 0;
1351 }
1352
1353 /* Create the /proc/net/ipconfig directory */
ipconfig_proc_net_init(void)1354 static int __init ipconfig_proc_net_init(void)
1355 {
1356 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net);
1357 if (!ipconfig_dir)
1358 return -ENOMEM;
1359
1360 return 0;
1361 }
1362
1363 /* Create a new file under /proc/net/ipconfig */
ipconfig_proc_net_create(const char * name,const struct proc_ops * proc_ops)1364 static int ipconfig_proc_net_create(const char *name,
1365 const struct proc_ops *proc_ops)
1366 {
1367 char *pname;
1368 struct proc_dir_entry *p;
1369
1370 if (!ipconfig_dir)
1371 return -ENOMEM;
1372
1373 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name);
1374 if (!pname)
1375 return -ENOMEM;
1376
1377 p = proc_create(pname, 0444, init_net.proc_net, proc_ops);
1378 kfree(pname);
1379 if (!p)
1380 return -ENOMEM;
1381
1382 return 0;
1383 }
1384
1385 /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */
ntp_servers_show(struct seq_file * seq,void * v)1386 static int ntp_servers_show(struct seq_file *seq, void *v)
1387 {
1388 int i;
1389
1390 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) {
1391 if (ic_ntp_servers[i] != NONE)
1392 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]);
1393 }
1394 return 0;
1395 }
1396 DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers);
1397 #endif /* CONFIG_PROC_FS */
1398
1399 /*
1400 * Extract IP address from the parameter string if needed. Note that we
1401 * need to have root_server_addr set _before_ IPConfig gets called as it
1402 * can override it.
1403 */
root_nfs_parse_addr(char * name)1404 __be32 __init root_nfs_parse_addr(char *name)
1405 {
1406 __be32 addr;
1407 int octets = 0;
1408 char *cp, *cq;
1409
1410 cp = cq = name;
1411 while (octets < 4) {
1412 while (*cp >= '0' && *cp <= '9')
1413 cp++;
1414 if (cp == cq || cp - cq > 3)
1415 break;
1416 if (*cp == '.' || octets == 3)
1417 octets++;
1418 if (octets < 4)
1419 cp++;
1420 cq = cp;
1421 }
1422 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1423 if (*cp == ':')
1424 *cp++ = '\0';
1425 addr = in_aton(name);
1426 memmove(name, cp, strlen(cp) + 1);
1427 } else
1428 addr = NONE;
1429
1430 return addr;
1431 }
1432
1433 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1434
wait_for_devices(void)1435 static int __init wait_for_devices(void)
1436 {
1437 int i;
1438 bool try_init_devs = true;
1439
1440 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1441 struct net_device *dev;
1442 int found = 0;
1443
1444 /* make sure deferred device probes are finished */
1445 wait_for_device_probe();
1446
1447 rtnl_lock();
1448 for_each_netdev(&init_net, dev) {
1449 if (ic_is_init_dev(dev)) {
1450 found = 1;
1451 break;
1452 }
1453 }
1454 rtnl_unlock();
1455 if (found)
1456 return 0;
1457 if (try_init_devs &&
1458 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) {
1459 try_init_devs = false;
1460 wait_for_init_devices_probe();
1461 }
1462 ssleep(1);
1463 }
1464 return -ENODEV;
1465 }
1466
1467 /*
1468 * IP Autoconfig dispatcher.
1469 */
1470
ip_auto_config(void)1471 static int __init ip_auto_config(void)
1472 {
1473 __be32 addr;
1474 #ifdef IPCONFIG_DYNAMIC
1475 int retries = CONF_OPEN_RETRIES;
1476 #endif
1477 int err;
1478 unsigned int i, count;
1479
1480 /* Initialise all name servers and NTP servers to NONE (but only if the
1481 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded,
1482 * otherwise we'll overwrite the IP addresses specified there)
1483 */
1484 if (ic_set_manually == 0) {
1485 ic_nameservers_predef();
1486 ic_ntp_servers_predef();
1487 }
1488
1489 #ifdef CONFIG_PROC_FS
1490 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show);
1491
1492 if (ipconfig_proc_net_init() == 0)
1493 ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops);
1494 #endif /* CONFIG_PROC_FS */
1495
1496 if (!ic_enable)
1497 return 0;
1498
1499 pr_debug("IP-Config: Entered.\n");
1500 #ifdef IPCONFIG_DYNAMIC
1501 try_try_again:
1502 #endif
1503 /* Wait for devices to appear */
1504 err = wait_for_devices();
1505 if (err)
1506 return err;
1507
1508 /* Setup all network devices */
1509 err = ic_open_devs();
1510 if (err)
1511 return err;
1512
1513 /* Give drivers a chance to settle */
1514 msleep(CONF_POST_OPEN);
1515
1516 /*
1517 * If the config information is insufficient (e.g., our IP address or
1518 * IP address of the boot server is missing or we have multiple network
1519 * interfaces and no default was set), use BOOTP or RARP to get the
1520 * missing values.
1521 */
1522 if (ic_myaddr == NONE ||
1523 #if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT)
1524 (root_server_addr == NONE &&
1525 ic_servaddr == NONE &&
1526 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) ||
1527 #endif
1528 ic_first_dev->next) {
1529 #ifdef IPCONFIG_DYNAMIC
1530 if (ic_dynamic() < 0) {
1531 ic_close_devs();
1532
1533 /*
1534 * I don't know why, but sometimes the
1535 * eepro100 driver (at least) gets upset and
1536 * doesn't work the first time it's opened.
1537 * But then if you close it and reopen it, it
1538 * works just fine. So we need to try that at
1539 * least once before giving up.
1540 *
1541 * Also, if the root will be NFS-mounted, we
1542 * have nowhere to go if DHCP fails. So we
1543 * just have to keep trying forever.
1544 *
1545 * -- Chip
1546 */
1547 #ifdef CONFIG_ROOT_NFS
1548 if (ROOT_DEV == Root_NFS) {
1549 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1550 goto try_try_again;
1551 }
1552 #endif
1553 #ifdef CONFIG_CIFS_ROOT
1554 if (ROOT_DEV == Root_CIFS) {
1555 pr_err("IP-Config: Retrying forever (CIFS root)...\n");
1556 goto try_try_again;
1557 }
1558 #endif
1559
1560 if (--retries) {
1561 pr_err("IP-Config: Reopening network devices...\n");
1562 goto try_try_again;
1563 }
1564
1565 /* Oh, well. At least we tried. */
1566 pr_err("IP-Config: Auto-configuration of network failed\n");
1567 return -1;
1568 }
1569 #else /* !DYNAMIC */
1570 pr_err("IP-Config: Incomplete network configuration information\n");
1571 ic_close_devs();
1572 return -1;
1573 #endif /* IPCONFIG_DYNAMIC */
1574 } else {
1575 /* Device selected manually or only one device -> use it */
1576 ic_dev = ic_first_dev;
1577 }
1578
1579 addr = root_nfs_parse_addr(root_server_path);
1580 if (root_server_addr == NONE)
1581 root_server_addr = addr;
1582
1583 /*
1584 * Use defaults wherever applicable.
1585 */
1586 if (ic_defaults() < 0)
1587 return -1;
1588
1589 /*
1590 * Record which protocol was actually used.
1591 */
1592 #ifdef IPCONFIG_DYNAMIC
1593 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1594 #endif
1595
1596 #ifndef IPCONFIG_SILENT
1597 /*
1598 * Clue in the operator.
1599 */
1600 pr_info("IP-Config: Complete:\n");
1601
1602 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1603 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1604 &ic_myaddr, &ic_netmask, &ic_gateway);
1605 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1606 utsname()->nodename, ic_domain, utsname()->domainname);
1607 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1608 &ic_servaddr, &root_server_addr, root_server_path);
1609 if (ic_dev_mtu)
1610 pr_cont(", mtu=%d", ic_dev_mtu);
1611 /* Name servers (if any): */
1612 for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) {
1613 if (ic_nameservers[i] != NONE) {
1614 if (i == 0)
1615 pr_info(" nameserver%u=%pI4",
1616 i, &ic_nameservers[i]);
1617 else
1618 pr_cont(", nameserver%u=%pI4",
1619 i, &ic_nameservers[i]);
1620
1621 count++;
1622 }
1623 if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0)
1624 pr_cont("\n");
1625 }
1626 /* NTP servers (if any): */
1627 for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) {
1628 if (ic_ntp_servers[i] != NONE) {
1629 if (i == 0)
1630 pr_info(" ntpserver%u=%pI4",
1631 i, &ic_ntp_servers[i]);
1632 else
1633 pr_cont(", ntpserver%u=%pI4",
1634 i, &ic_ntp_servers[i]);
1635
1636 count++;
1637 }
1638 if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0)
1639 pr_cont("\n");
1640 }
1641 #endif /* !SILENT */
1642
1643 /*
1644 * Close all network devices except the device we've
1645 * autoconfigured and set up routes.
1646 */
1647 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1648 err = -1;
1649 else
1650 err = 0;
1651
1652 ic_close_devs();
1653
1654 return err;
1655 }
1656
1657 late_initcall(ip_auto_config);
1658
1659
1660 /*
1661 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1662 * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst.
1663 */
ic_proto_name(char * name)1664 static int __init ic_proto_name(char *name)
1665 {
1666 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1667 return 1;
1668 }
1669 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1670 return 0;
1671 }
1672 #ifdef CONFIG_IP_PNP_DHCP
1673 else if (!strncmp(name, "dhcp", 4)) {
1674 char *client_id;
1675
1676 ic_proto_enabled &= ~IC_RARP;
1677 client_id = strstr(name, "dhcp,");
1678 if (client_id) {
1679 char *v;
1680
1681 client_id = client_id + 5;
1682 v = strchr(client_id, ',');
1683 if (!v)
1684 return 1;
1685 *v = 0;
1686 if (kstrtou8(client_id, 0, dhcp_client_identifier))
1687 pr_debug("DHCP: Invalid client identifier type\n");
1688 strscpy(dhcp_client_identifier + 1, v + 1,
1689 sizeof(dhcp_client_identifier) - 1);
1690 *v = ',';
1691 }
1692 return 1;
1693 }
1694 #endif
1695 #ifdef CONFIG_IP_PNP_BOOTP
1696 else if (!strcmp(name, "bootp")) {
1697 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1698 return 1;
1699 }
1700 #endif
1701 #ifdef CONFIG_IP_PNP_RARP
1702 else if (!strcmp(name, "rarp")) {
1703 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1704 return 1;
1705 }
1706 #endif
1707 #ifdef IPCONFIG_DYNAMIC
1708 else if (!strcmp(name, "both")) {
1709 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1710 return 1;
1711 }
1712 #endif
1713 return 0;
1714 }
1715
ip_auto_config_setup(char * addrs)1716 static int __init ip_auto_config_setup(char *addrs)
1717 {
1718 char *cp, *ip, *dp;
1719 int num = 0;
1720
1721 ic_set_manually = 1;
1722 ic_enable = 1;
1723
1724 /*
1725 * If any dhcp, bootp etc options are set, leave autoconfig on
1726 * and skip the below static IP processing.
1727 */
1728 if (ic_proto_name(addrs))
1729 return 1;
1730
1731 /* If no static IP is given, turn off autoconfig and bail. */
1732 if (*addrs == 0 ||
1733 strcmp(addrs, "off") == 0 ||
1734 strcmp(addrs, "none") == 0) {
1735 ic_enable = 0;
1736 return 1;
1737 }
1738
1739 /* Initialise all name servers and NTP servers to NONE */
1740 ic_nameservers_predef();
1741 ic_ntp_servers_predef();
1742
1743 /* Parse string for static IP assignment. */
1744 ip = addrs;
1745 while (ip && *ip) {
1746 if ((cp = strchr(ip, ':')))
1747 *cp++ = '\0';
1748 if (strlen(ip) > 0) {
1749 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1750 switch (num) {
1751 case 0:
1752 if ((ic_myaddr = in_aton(ip)) == ANY)
1753 ic_myaddr = NONE;
1754 break;
1755 case 1:
1756 if ((ic_servaddr = in_aton(ip)) == ANY)
1757 ic_servaddr = NONE;
1758 break;
1759 case 2:
1760 if ((ic_gateway = in_aton(ip)) == ANY)
1761 ic_gateway = NONE;
1762 break;
1763 case 3:
1764 if ((ic_netmask = in_aton(ip)) == ANY)
1765 ic_netmask = NONE;
1766 break;
1767 case 4:
1768 if ((dp = strchr(ip, '.'))) {
1769 *dp++ = '\0';
1770 strscpy(utsname()->domainname, dp,
1771 sizeof(utsname()->domainname));
1772 }
1773 strscpy(utsname()->nodename, ip,
1774 sizeof(utsname()->nodename));
1775 ic_host_name_set = 1;
1776 break;
1777 case 5:
1778 strscpy(user_dev_name, ip, sizeof(user_dev_name));
1779 break;
1780 case 6:
1781 if (ic_proto_name(ip) == 0 &&
1782 ic_myaddr == NONE) {
1783 ic_enable = 0;
1784 }
1785 break;
1786 case 7:
1787 if (CONF_NAMESERVERS_MAX >= 1) {
1788 ic_nameservers[0] = in_aton(ip);
1789 if (ic_nameservers[0] == ANY)
1790 ic_nameservers[0] = NONE;
1791 }
1792 break;
1793 case 8:
1794 if (CONF_NAMESERVERS_MAX >= 2) {
1795 ic_nameservers[1] = in_aton(ip);
1796 if (ic_nameservers[1] == ANY)
1797 ic_nameservers[1] = NONE;
1798 }
1799 break;
1800 case 9:
1801 if (CONF_NTP_SERVERS_MAX >= 1) {
1802 ic_ntp_servers[0] = in_aton(ip);
1803 if (ic_ntp_servers[0] == ANY)
1804 ic_ntp_servers[0] = NONE;
1805 }
1806 break;
1807 }
1808 }
1809 ip = cp;
1810 num++;
1811 }
1812
1813 return 1;
1814 }
1815 __setup("ip=", ip_auto_config_setup);
1816
nfsaddrs_config_setup(char * addrs)1817 static int __init nfsaddrs_config_setup(char *addrs)
1818 {
1819 return ip_auto_config_setup(addrs);
1820 }
1821 __setup("nfsaddrs=", nfsaddrs_config_setup);
1822
vendor_class_identifier_setup(char * addrs)1823 static int __init vendor_class_identifier_setup(char *addrs)
1824 {
1825 if (strscpy(vendor_class_identifier, addrs,
1826 sizeof(vendor_class_identifier))
1827 >= sizeof(vendor_class_identifier))
1828 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1829 vendor_class_identifier);
1830 return 1;
1831 }
1832 __setup("dhcpclass=", vendor_class_identifier_setup);
1833
set_carrier_timeout(char * str)1834 static int __init set_carrier_timeout(char *str)
1835 {
1836 ssize_t ret;
1837
1838 if (!str)
1839 return 0;
1840
1841 ret = kstrtouint(str, 0, &carrier_timeout);
1842 if (ret)
1843 return 0;
1844
1845 return 1;
1846 }
1847 __setup("carrier_timeout=", set_carrier_timeout);
1848