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 | |
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 | |
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, flags: 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, flags: 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(size: sizeof(struct ic_device), GFP_KERNEL))) { |
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(buf: &d->xid, len: 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 + msecs_to_jiffies(m: 20000); |
278 | while (time_before(jiffies, start + |
279 | msecs_to_jiffies(carrier_timeout * 1000))) { |
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(msecs: 1); |
291 | |
292 | if (time_before(jiffies, next_msg)) |
293 | continue; |
294 | |
295 | elapsed = jiffies_to_msecs(j: 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 + msecs_to_jiffies(m: 20000); |
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 | */ |
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, flags: d->flags, NULL); |
345 | } |
346 | kfree(objp: d); |
347 | } |
348 | rtnl_unlock(); |
349 | } |
350 | |
351 | /* |
352 | * Interface to various network functions. |
353 | */ |
354 | |
355 | static inline void |
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 | |
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(p: ir.ifr_ifrn.ifrn_name, q: ic_dev->dev->name); |
375 | set_sockaddr(sin, addr: ic_myaddr, port: 0); |
376 | if ((err = devinet_ioctl(net: &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, addr: ic_netmask, port: 0); |
382 | if ((err = devinet_ioctl(net: &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, addr: ic_myaddr | ~ic_netmask, port: 0); |
388 | if ((err = devinet_ioctl(net: &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 | |
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(sin: (struct sockaddr_in *) &rm.rt_dst, addr: 0, port: 0); |
421 | set_sockaddr(sin: (struct sockaddr_in *) &rm.rt_genmask, addr: 0, port: 0); |
422 | set_sockaddr(sin: (struct sockaddr_in *) &rm.rt_gateway, addr: ic_gateway, port: 0); |
423 | rm.rt_flags = RTF_UP | RTF_GATEWAY; |
424 | if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, rt: &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 | |
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(buf: init_utsname()->nodename, fmt: "%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 | |
485 | static inline void __init ic_rarp_init(void) |
486 | { |
487 | dev_add_pack(pt: &rarp_packet_type); |
488 | } |
489 | |
490 | static inline void __init ic_rarp_cleanup(void) |
491 | { |
492 | dev_remove_pack(pt: &rarp_packet_type); |
493 | } |
494 | |
495 | /* |
496 | * Process received RARP packet. |
497 | */ |
498 | static int __init |
499 | ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
500 | { |
501 | struct arphdr *rarp; |
502 | unsigned char *rarp_ptr; |
503 | __be32 sip, tip; |
504 | unsigned char *tha; /* t for "target" */ |
505 | struct ic_device *d; |
506 | |
507 | if (!net_eq(net1: dev_net(dev), net2: &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, len: 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, len: 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(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(p: tha, q: dev->dev_addr, size: 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(lock: &ic_recv_lock); |
582 | |
583 | drop: |
584 | /* Throw the packet out. */ |
585 | kfree_skb(skb); |
586 | return 0; |
587 | } |
588 | |
589 | |
590 | /* |
591 | * Send RARP request packet over a single interface. |
592 | */ |
593 | static void __init ic_rarp_send_if(struct ic_device *d) |
594 | { |
595 | struct net_device *dev = d->dev; |
596 | arp_send(ARPOP_RREQUEST, ETH_P_RARP, dest_ip: 0, dev, src_ip: 0, NULL, |
597 | src_hw: dev->dev_addr, th: dev->dev_addr); |
598 | } |
599 | #endif |
600 | |
601 | /* |
602 | * Predefine Nameservers |
603 | */ |
604 | static inline void __init ic_nameservers_predef(void) |
605 | { |
606 | int i; |
607 | |
608 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) |
609 | ic_nameservers[i] = NONE; |
610 | } |
611 | |
612 | /* Predefine NTP servers */ |
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 |
680 | ic_dhcp_init_options(u8 *options, struct ic_device *d) |
681 | { |
682 | u8 mt = ((ic_servaddr == NONE) |
683 | ? DHCPDISCOVER : DHCPREQUEST); |
684 | u8 *e = options; |
685 | int len; |
686 | |
687 | pr_debug("DHCP: Sending message type %d (%s)\n" , mt, d->dev->name); |
688 | |
689 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ |
690 | e += 4; |
691 | |
692 | *e++ = 53; /* DHCP message type */ |
693 | *e++ = 1; |
694 | *e++ = mt; |
695 | |
696 | if (mt == DHCPREQUEST) { |
697 | *e++ = 54; /* Server ID (IP address) */ |
698 | *e++ = 4; |
699 | memcpy(e, &ic_servaddr, 4); |
700 | e += 4; |
701 | |
702 | *e++ = 50; /* Requested IP address */ |
703 | *e++ = 4; |
704 | memcpy(e, &ic_myaddr, 4); |
705 | e += 4; |
706 | } |
707 | |
708 | /* always? */ |
709 | { |
710 | static const u8 ic_req_params[] = { |
711 | 1, /* Subnet mask */ |
712 | 3, /* Default gateway */ |
713 | 6, /* DNS server */ |
714 | 12, /* Host name */ |
715 | 15, /* Domain name */ |
716 | 17, /* Boot path */ |
717 | 26, /* MTU */ |
718 | 40, /* NIS domain name */ |
719 | 42, /* NTP servers */ |
720 | }; |
721 | |
722 | *e++ = 55; /* Parameter request list */ |
723 | *e++ = sizeof(ic_req_params); |
724 | memcpy(e, ic_req_params, sizeof(ic_req_params)); |
725 | e += sizeof(ic_req_params); |
726 | |
727 | if (ic_host_name_set) { |
728 | *e++ = 12; /* host-name */ |
729 | len = strlen(utsname()->nodename); |
730 | *e++ = len; |
731 | memcpy(e, utsname()->nodename, len); |
732 | e += len; |
733 | } |
734 | if (*vendor_class_identifier) { |
735 | pr_info("DHCP: sending class identifier \"%s\"\n" , |
736 | vendor_class_identifier); |
737 | *e++ = 60; /* Class-identifier */ |
738 | len = strlen(vendor_class_identifier); |
739 | *e++ = len; |
740 | memcpy(e, vendor_class_identifier, len); |
741 | e += len; |
742 | } |
743 | len = strlen(dhcp_client_identifier + 1); |
744 | /* the minimum length of identifier is 2, include 1 byte type, |
745 | * and can not be larger than the length of options |
746 | */ |
747 | if (len >= 1 && len < 312 - (e - options) - 1) { |
748 | *e++ = 61; |
749 | *e++ = len + 1; |
750 | memcpy(e, dhcp_client_identifier, len + 1); |
751 | e += len + 1; |
752 | } |
753 | } |
754 | |
755 | *e++ = 255; /* End of the list */ |
756 | } |
757 | |
758 | #endif /* IPCONFIG_DHCP */ |
759 | |
760 | static void __init ic_bootp_init_ext(u8 *e) |
761 | { |
762 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ |
763 | e += 4; |
764 | *e++ = 1; /* Subnet mask request */ |
765 | *e++ = 4; |
766 | e += 4; |
767 | *e++ = 3; /* Default gateway request */ |
768 | *e++ = 4; |
769 | e += 4; |
770 | #if CONF_NAMESERVERS_MAX > 0 |
771 | *e++ = 6; /* (DNS) name server request */ |
772 | *e++ = 4 * CONF_NAMESERVERS_MAX; |
773 | e += 4 * CONF_NAMESERVERS_MAX; |
774 | #endif |
775 | *e++ = 12; /* Host name request */ |
776 | *e++ = 32; |
777 | e += 32; |
778 | *e++ = 40; /* NIS Domain name request */ |
779 | *e++ = 32; |
780 | e += 32; |
781 | *e++ = 17; /* Boot path */ |
782 | *e++ = 40; |
783 | e += 40; |
784 | |
785 | *e++ = 57; /* set extension buffer size for reply */ |
786 | *e++ = 2; |
787 | *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ |
788 | *e++ = 150; |
789 | |
790 | *e++ = 255; /* End of the list */ |
791 | } |
792 | |
793 | |
794 | /* |
795 | * Initialize the DHCP/BOOTP mechanism. |
796 | */ |
797 | static inline void __init ic_bootp_init(void) |
798 | { |
799 | /* Re-initialise all name servers and NTP servers to NONE, in case any |
800 | * were set via the "ip=" or "nfsaddrs=" kernel command line parameters: |
801 | * any IP addresses specified there will already have been decoded but |
802 | * are no longer needed |
803 | */ |
804 | ic_nameservers_predef(); |
805 | ic_ntp_servers_predef(); |
806 | |
807 | dev_add_pack(pt: &bootp_packet_type); |
808 | } |
809 | |
810 | |
811 | /* |
812 | * DHCP/BOOTP cleanup. |
813 | */ |
814 | static inline void __init ic_bootp_cleanup(void) |
815 | { |
816 | dev_remove_pack(pt: &bootp_packet_type); |
817 | } |
818 | |
819 | |
820 | /* |
821 | * Send DHCP/BOOTP request to single interface. |
822 | */ |
823 | static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) |
824 | { |
825 | struct net_device *dev = d->dev; |
826 | struct sk_buff *skb; |
827 | struct bootp_pkt *b; |
828 | struct iphdr *h; |
829 | int hlen = LL_RESERVED_SPACE(dev); |
830 | int tlen = dev->needed_tailroom; |
831 | |
832 | /* Allocate packet */ |
833 | skb = alloc_skb(size: sizeof(struct bootp_pkt) + hlen + tlen + 15, |
834 | GFP_KERNEL); |
835 | if (!skb) |
836 | return; |
837 | skb_reserve(skb, len: hlen); |
838 | b = skb_put_zero(skb, len: sizeof(struct bootp_pkt)); |
839 | |
840 | /* Construct IP header */ |
841 | skb_reset_network_header(skb); |
842 | h = ip_hdr(skb); |
843 | h->version = 4; |
844 | h->ihl = 5; |
845 | h->tot_len = htons(sizeof(struct bootp_pkt)); |
846 | h->frag_off = htons(IP_DF); |
847 | h->ttl = 64; |
848 | h->protocol = IPPROTO_UDP; |
849 | h->daddr = htonl(INADDR_BROADCAST); |
850 | h->check = ip_fast_csum(iph: (unsigned char *) h, ihl: h->ihl); |
851 | |
852 | /* Construct UDP header */ |
853 | b->udph.source = htons(68); |
854 | b->udph.dest = htons(67); |
855 | b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); |
856 | /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ |
857 | |
858 | /* Construct DHCP/BOOTP header */ |
859 | b->op = BOOTP_REQUEST; |
860 | if (dev->type < 256) /* check for false types */ |
861 | b->htype = dev->type; |
862 | else if (dev->type == ARPHRD_FDDI) |
863 | b->htype = ARPHRD_ETHER; |
864 | else { |
865 | pr_warn("Unknown ARP type 0x%04x for device %s\n" , dev->type, |
866 | dev->name); |
867 | b->htype = dev->type; /* can cause undefined behavior */ |
868 | } |
869 | |
870 | /* server_ip and your_ip address are both already zero per RFC2131 */ |
871 | b->hlen = dev->addr_len; |
872 | memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); |
873 | b->secs = htons(jiffies_diff / HZ); |
874 | b->xid = d->xid; |
875 | |
876 | /* add DHCP options or BOOTP extensions */ |
877 | #ifdef IPCONFIG_DHCP |
878 | if (ic_proto_enabled & IC_USE_DHCP) |
879 | ic_dhcp_init_options(options: b->exten, d); |
880 | else |
881 | #endif |
882 | ic_bootp_init_ext(e: b->exten); |
883 | |
884 | /* Chain packet down the line... */ |
885 | skb->dev = dev; |
886 | skb->protocol = htons(ETH_P_IP); |
887 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), |
888 | daddr: dev->broadcast, saddr: dev->dev_addr, len: skb->len) < 0) { |
889 | kfree_skb(skb); |
890 | printk("E" ); |
891 | return; |
892 | } |
893 | |
894 | if (dev_queue_xmit(skb) < 0) |
895 | printk("E" ); |
896 | } |
897 | |
898 | |
899 | /* |
900 | * Copy BOOTP-supplied string |
901 | */ |
902 | static int __init ic_bootp_string(char *dest, char *src, int len, int max) |
903 | { |
904 | if (!len) |
905 | return 0; |
906 | if (len > max-1) |
907 | len = max-1; |
908 | memcpy(dest, src, len); |
909 | dest[len] = '\0'; |
910 | return 1; |
911 | } |
912 | |
913 | |
914 | /* |
915 | * Process BOOTP extensions. |
916 | */ |
917 | static void __init ic_do_bootp_ext(u8 *ext) |
918 | { |
919 | u8 servers; |
920 | int i; |
921 | __be16 mtu; |
922 | |
923 | u8 *c; |
924 | |
925 | pr_debug("DHCP/BOOTP: Got extension %d:" , *ext); |
926 | for (c=ext+2; c<ext+2+ext[1]; c++) |
927 | pr_debug(" %02x" , *c); |
928 | pr_debug("\n" ); |
929 | |
930 | switch (*ext++) { |
931 | case 1: /* Subnet mask */ |
932 | if (ic_netmask == NONE) |
933 | memcpy(&ic_netmask, ext+1, 4); |
934 | break; |
935 | case 3: /* Default gateway */ |
936 | if (ic_gateway == NONE) |
937 | memcpy(&ic_gateway, ext+1, 4); |
938 | break; |
939 | case 6: /* DNS server */ |
940 | servers= *ext/4; |
941 | if (servers > CONF_NAMESERVERS_MAX) |
942 | servers = CONF_NAMESERVERS_MAX; |
943 | for (i = 0; i < servers; i++) { |
944 | if (ic_nameservers[i] == NONE || |
945 | ic_nameservers_fallback) |
946 | memcpy(&ic_nameservers[i], ext+1+4*i, 4); |
947 | } |
948 | break; |
949 | case 12: /* Host name */ |
950 | if (!ic_host_name_set) { |
951 | ic_bootp_string(dest: utsname()->nodename, src: ext+1, len: *ext, |
952 | __NEW_UTS_LEN); |
953 | ic_host_name_set = 1; |
954 | } |
955 | break; |
956 | case 15: /* Domain name (DNS) */ |
957 | if (!ic_domain[0]) |
958 | ic_bootp_string(dest: ic_domain, src: ext+1, len: *ext, max: sizeof(ic_domain)); |
959 | break; |
960 | case 17: /* Root path */ |
961 | if (!root_server_path[0]) |
962 | ic_bootp_string(dest: root_server_path, src: ext+1, len: *ext, |
963 | max: sizeof(root_server_path)); |
964 | break; |
965 | case 26: /* Interface MTU */ |
966 | memcpy(&mtu, ext+1, sizeof(mtu)); |
967 | ic_dev_mtu = ntohs(mtu); |
968 | break; |
969 | case 40: /* NIS Domain name (_not_ DNS) */ |
970 | ic_bootp_string(dest: utsname()->domainname, src: ext+1, len: *ext, |
971 | __NEW_UTS_LEN); |
972 | break; |
973 | case 42: /* NTP servers */ |
974 | servers = *ext / 4; |
975 | if (servers > CONF_NTP_SERVERS_MAX) |
976 | servers = CONF_NTP_SERVERS_MAX; |
977 | for (i = 0; i < servers; i++) { |
978 | if (ic_ntp_servers[i] == NONE) |
979 | memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); |
980 | } |
981 | break; |
982 | } |
983 | } |
984 | |
985 | |
986 | /* |
987 | * Receive BOOTP reply. |
988 | */ |
989 | static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
990 | { |
991 | struct bootp_pkt *b; |
992 | struct iphdr *h; |
993 | struct ic_device *d; |
994 | int len, ext_len; |
995 | |
996 | if (!net_eq(net1: dev_net(dev), net2: &init_net)) |
997 | goto drop; |
998 | |
999 | /* Perform verifications before taking the lock. */ |
1000 | if (skb->pkt_type == PACKET_OTHERHOST) |
1001 | goto drop; |
1002 | |
1003 | skb = skb_share_check(skb, GFP_ATOMIC); |
1004 | if (!skb) |
1005 | return NET_RX_DROP; |
1006 | |
1007 | if (!pskb_may_pull(skb, |
1008 | len: sizeof(struct iphdr) + |
1009 | sizeof(struct udphdr))) |
1010 | goto drop; |
1011 | |
1012 | b = (struct bootp_pkt *)skb_network_header(skb); |
1013 | h = &b->iph; |
1014 | |
1015 | if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) |
1016 | goto drop; |
1017 | |
1018 | /* Fragments are not supported */ |
1019 | if (ip_is_fragment(iph: h)) { |
1020 | net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n" ); |
1021 | goto drop; |
1022 | } |
1023 | |
1024 | if (skb->len < ntohs(h->tot_len)) |
1025 | goto drop; |
1026 | |
1027 | if (ip_fast_csum(iph: (char *) h, ihl: h->ihl)) |
1028 | goto drop; |
1029 | |
1030 | if (b->udph.source != htons(67) || b->udph.dest != htons(68)) |
1031 | goto drop; |
1032 | |
1033 | if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) |
1034 | goto drop; |
1035 | |
1036 | len = ntohs(b->udph.len) - sizeof(struct udphdr); |
1037 | ext_len = len - (sizeof(*b) - |
1038 | sizeof(struct iphdr) - |
1039 | sizeof(struct udphdr) - |
1040 | sizeof(b->exten)); |
1041 | if (ext_len < 0) |
1042 | goto drop; |
1043 | |
1044 | /* Ok the front looks good, make sure we can get at the rest. */ |
1045 | if (!pskb_may_pull(skb, len: skb->len)) |
1046 | goto drop; |
1047 | |
1048 | b = (struct bootp_pkt *)skb_network_header(skb); |
1049 | h = &b->iph; |
1050 | |
1051 | /* One reply at a time, please. */ |
1052 | spin_lock(lock: &ic_recv_lock); |
1053 | |
1054 | /* If we already have a reply, just drop the packet */ |
1055 | if (ic_got_reply) |
1056 | goto drop_unlock; |
1057 | |
1058 | /* Find the ic_device that the packet arrived on */ |
1059 | d = ic_first_dev; |
1060 | while (d && d->dev != dev) |
1061 | d = d->next; |
1062 | if (!d) |
1063 | goto drop_unlock; /* should never happen */ |
1064 | |
1065 | /* Is it a reply to our BOOTP request? */ |
1066 | if (b->op != BOOTP_REPLY || |
1067 | b->xid != d->xid) { |
1068 | net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n" , |
1069 | d->dev->name, b->op, b->xid); |
1070 | goto drop_unlock; |
1071 | } |
1072 | |
1073 | /* Parse extensions */ |
1074 | if (ext_len >= 4 && |
1075 | !memcmp(p: b->exten, q: ic_bootp_cookie, size: 4)) { /* Check magic cookie */ |
1076 | u8 *end = (u8 *) b + ntohs(b->iph.tot_len); |
1077 | u8 *ext; |
1078 | |
1079 | #ifdef IPCONFIG_DHCP |
1080 | if (ic_proto_enabled & IC_USE_DHCP) { |
1081 | __be32 server_id = NONE; |
1082 | int mt = 0; |
1083 | |
1084 | ext = &b->exten[4]; |
1085 | while (ext < end && *ext != 0xff) { |
1086 | u8 *opt = ext++; |
1087 | if (*opt == 0) /* Padding */ |
1088 | continue; |
1089 | ext += *ext + 1; |
1090 | if (ext >= end) |
1091 | break; |
1092 | switch (*opt) { |
1093 | case 53: /* Message type */ |
1094 | if (opt[1]) |
1095 | mt = opt[2]; |
1096 | break; |
1097 | case 54: /* Server ID (IP address) */ |
1098 | if (opt[1] >= 4) |
1099 | memcpy(&server_id, opt + 2, 4); |
1100 | break; |
1101 | } |
1102 | } |
1103 | |
1104 | pr_debug("DHCP: Got message type %d (%s)\n" , mt, d->dev->name); |
1105 | |
1106 | switch (mt) { |
1107 | case DHCPOFFER: |
1108 | /* While in the process of accepting one offer, |
1109 | * ignore all others. |
1110 | */ |
1111 | if (ic_myaddr != NONE) |
1112 | goto drop_unlock; |
1113 | |
1114 | /* Let's accept that offer. */ |
1115 | ic_myaddr = b->your_ip; |
1116 | ic_servaddr = server_id; |
1117 | pr_debug("DHCP: Offered address %pI4 by server %pI4\n" , |
1118 | &ic_myaddr, &b->iph.saddr); |
1119 | /* The DHCP indicated server address takes |
1120 | * precedence over the bootp header one if |
1121 | * they are different. |
1122 | */ |
1123 | if ((server_id != NONE) && |
1124 | (b->server_ip != server_id)) |
1125 | b->server_ip = ic_servaddr; |
1126 | break; |
1127 | |
1128 | case DHCPACK: |
1129 | if (memcmp(p: dev->dev_addr, q: b->hw_addr, size: dev->addr_len) != 0) |
1130 | goto drop_unlock; |
1131 | |
1132 | /* Yeah! */ |
1133 | break; |
1134 | |
1135 | default: |
1136 | /* Urque. Forget it*/ |
1137 | ic_myaddr = NONE; |
1138 | ic_servaddr = NONE; |
1139 | goto drop_unlock; |
1140 | } |
1141 | |
1142 | ic_dhcp_msgtype = mt; |
1143 | |
1144 | } |
1145 | #endif /* IPCONFIG_DHCP */ |
1146 | |
1147 | ext = &b->exten[4]; |
1148 | while (ext < end && *ext != 0xff) { |
1149 | u8 *opt = ext++; |
1150 | if (*opt == 0) /* Padding */ |
1151 | continue; |
1152 | ext += *ext + 1; |
1153 | if (ext < end) |
1154 | ic_do_bootp_ext(ext: opt); |
1155 | } |
1156 | } |
1157 | |
1158 | /* We have a winner! */ |
1159 | ic_dev = d; |
1160 | ic_myaddr = b->your_ip; |
1161 | ic_servaddr = b->server_ip; |
1162 | ic_addrservaddr = b->iph.saddr; |
1163 | if (ic_gateway == NONE && b->relay_ip) |
1164 | ic_gateway = b->relay_ip; |
1165 | if (ic_nameservers[0] == NONE) { |
1166 | ic_nameservers[0] = ic_servaddr; |
1167 | ic_nameservers_fallback = 1; |
1168 | } |
1169 | ic_got_reply = IC_BOOTP; |
1170 | |
1171 | drop_unlock: |
1172 | /* Show's over. Nothing to see here. */ |
1173 | spin_unlock(lock: &ic_recv_lock); |
1174 | |
1175 | drop: |
1176 | /* Throw the packet out. */ |
1177 | kfree_skb(skb); |
1178 | |
1179 | return 0; |
1180 | } |
1181 | |
1182 | |
1183 | #endif |
1184 | |
1185 | |
1186 | /* |
1187 | * Dynamic IP configuration -- DHCP, BOOTP, RARP. |
1188 | */ |
1189 | |
1190 | #ifdef IPCONFIG_DYNAMIC |
1191 | |
1192 | static int __init ic_dynamic(void) |
1193 | { |
1194 | int retries; |
1195 | struct ic_device *d; |
1196 | unsigned long start_jiffies, timeout, jiff; |
1197 | int do_bootp = ic_proto_have_if & IC_BOOTP; |
1198 | int do_rarp = ic_proto_have_if & IC_RARP; |
1199 | |
1200 | /* |
1201 | * If none of DHCP/BOOTP/RARP was selected, return with an error. |
1202 | * This routine gets only called when some pieces of information |
1203 | * are missing, and without DHCP/BOOTP/RARP we are unable to get it. |
1204 | */ |
1205 | if (!ic_proto_enabled) { |
1206 | pr_err("IP-Config: Incomplete network configuration information\n" ); |
1207 | return -1; |
1208 | } |
1209 | |
1210 | #ifdef IPCONFIG_BOOTP |
1211 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) |
1212 | pr_err("DHCP/BOOTP: No suitable device found\n" ); |
1213 | #endif |
1214 | #ifdef IPCONFIG_RARP |
1215 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) |
1216 | pr_err("RARP: No suitable device found\n" ); |
1217 | #endif |
1218 | |
1219 | if (!ic_proto_have_if) |
1220 | /* Error message already printed */ |
1221 | return -1; |
1222 | |
1223 | /* |
1224 | * Setup protocols |
1225 | */ |
1226 | #ifdef IPCONFIG_BOOTP |
1227 | if (do_bootp) |
1228 | ic_bootp_init(); |
1229 | #endif |
1230 | #ifdef IPCONFIG_RARP |
1231 | if (do_rarp) |
1232 | ic_rarp_init(); |
1233 | #endif |
1234 | |
1235 | /* |
1236 | * Send requests and wait, until we get an answer. This loop |
1237 | * seems to be a terrible waste of CPU time, but actually there is |
1238 | * only one process running at all, so we don't need to use any |
1239 | * scheduler functions. |
1240 | * [Actually we could now, but the nothing else running note still |
1241 | * applies.. - AC] |
1242 | */ |
1243 | pr_notice("Sending %s%s%s requests ." , |
1244 | do_bootp |
1245 | ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP" ) : "" , |
1246 | (do_bootp && do_rarp) ? " and " : "" , |
1247 | do_rarp ? "RARP" : "" ); |
1248 | |
1249 | start_jiffies = jiffies; |
1250 | d = ic_first_dev; |
1251 | retries = CONF_SEND_RETRIES; |
1252 | get_random_bytes(buf: &timeout, len: sizeof(timeout)); |
1253 | timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); |
1254 | for (;;) { |
1255 | #ifdef IPCONFIG_BOOTP |
1256 | if (do_bootp && (d->able & IC_BOOTP)) |
1257 | ic_bootp_send_if(d, jiffies_diff: jiffies - start_jiffies); |
1258 | #endif |
1259 | #ifdef IPCONFIG_RARP |
1260 | if (do_rarp && (d->able & IC_RARP)) |
1261 | ic_rarp_send_if(d); |
1262 | #endif |
1263 | |
1264 | if (!d->next) { |
1265 | jiff = jiffies + timeout; |
1266 | while (time_before(jiffies, jiff) && !ic_got_reply) |
1267 | schedule_timeout_uninterruptible(timeout: 1); |
1268 | } |
1269 | #ifdef IPCONFIG_DHCP |
1270 | /* DHCP isn't done until we get a DHCPACK. */ |
1271 | if ((ic_got_reply & IC_BOOTP) && |
1272 | (ic_proto_enabled & IC_USE_DHCP) && |
1273 | ic_dhcp_msgtype != DHCPACK) { |
1274 | ic_got_reply = 0; |
1275 | /* continue on device that got the reply */ |
1276 | d = ic_dev; |
1277 | pr_cont("," ); |
1278 | continue; |
1279 | } |
1280 | #endif /* IPCONFIG_DHCP */ |
1281 | |
1282 | if (ic_got_reply) { |
1283 | pr_cont(" OK\n" ); |
1284 | break; |
1285 | } |
1286 | |
1287 | if ((d = d->next)) |
1288 | continue; |
1289 | |
1290 | if (! --retries) { |
1291 | pr_cont(" timed out!\n" ); |
1292 | break; |
1293 | } |
1294 | |
1295 | d = ic_first_dev; |
1296 | |
1297 | timeout = timeout CONF_TIMEOUT_MULT; |
1298 | if (timeout > CONF_TIMEOUT_MAX) |
1299 | timeout = CONF_TIMEOUT_MAX; |
1300 | |
1301 | pr_cont("." ); |
1302 | } |
1303 | |
1304 | #ifdef IPCONFIG_BOOTP |
1305 | if (do_bootp) |
1306 | ic_bootp_cleanup(); |
1307 | #endif |
1308 | #ifdef IPCONFIG_RARP |
1309 | if (do_rarp) |
1310 | ic_rarp_cleanup(); |
1311 | #endif |
1312 | |
1313 | if (!ic_got_reply) { |
1314 | ic_myaddr = NONE; |
1315 | return -1; |
1316 | } |
1317 | |
1318 | pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n" , |
1319 | ((ic_got_reply & IC_RARP) ? "RARP" |
1320 | : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP" ), |
1321 | &ic_addrservaddr, &ic_myaddr); |
1322 | |
1323 | return 0; |
1324 | } |
1325 | |
1326 | #endif /* IPCONFIG_DYNAMIC */ |
1327 | |
1328 | #ifdef CONFIG_PROC_FS |
1329 | /* proc_dir_entry for /proc/net/ipconfig */ |
1330 | static struct proc_dir_entry *ipconfig_dir; |
1331 | |
1332 | /* Name servers: */ |
1333 | static int pnp_seq_show(struct seq_file *seq, void *v) |
1334 | { |
1335 | int i; |
1336 | |
1337 | if (ic_proto_used & IC_PROTO) |
1338 | seq_printf(m: seq, fmt: "#PROTO: %s\n" , |
1339 | (ic_proto_used & IC_RARP) ? "RARP" |
1340 | : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP" ); |
1341 | else |
1342 | seq_puts(m: seq, s: "#MANUAL\n" ); |
1343 | |
1344 | if (ic_domain[0]) |
1345 | seq_printf(m: seq, |
1346 | fmt: "domain %s\n" , ic_domain); |
1347 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { |
1348 | if (ic_nameservers[i] != NONE) |
1349 | seq_printf(m: seq, fmt: "nameserver %pI4\n" , |
1350 | &ic_nameservers[i]); |
1351 | } |
1352 | if (ic_servaddr != NONE) |
1353 | seq_printf(m: seq, fmt: "bootserver %pI4\n" , |
1354 | &ic_servaddr); |
1355 | return 0; |
1356 | } |
1357 | |
1358 | /* Create the /proc/net/ipconfig directory */ |
1359 | static int __init ipconfig_proc_net_init(void) |
1360 | { |
1361 | ipconfig_dir = proc_net_mkdir(net: &init_net, name: "ipconfig" , parent: init_net.proc_net); |
1362 | if (!ipconfig_dir) |
1363 | return -ENOMEM; |
1364 | |
1365 | return 0; |
1366 | } |
1367 | |
1368 | /* Create a new file under /proc/net/ipconfig */ |
1369 | static int ipconfig_proc_net_create(const char *name, |
1370 | const struct proc_ops *proc_ops) |
1371 | { |
1372 | char *pname; |
1373 | struct proc_dir_entry *p; |
1374 | |
1375 | if (!ipconfig_dir) |
1376 | return -ENOMEM; |
1377 | |
1378 | pname = kasprintf(GFP_KERNEL, fmt: "%s%s" , "ipconfig/" , name); |
1379 | if (!pname) |
1380 | return -ENOMEM; |
1381 | |
1382 | p = proc_create(name: pname, mode: 0444, parent: init_net.proc_net, proc_ops); |
1383 | kfree(objp: pname); |
1384 | if (!p) |
1385 | return -ENOMEM; |
1386 | |
1387 | return 0; |
1388 | } |
1389 | |
1390 | /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ |
1391 | static int ntp_servers_show(struct seq_file *seq, void *v) |
1392 | { |
1393 | int i; |
1394 | |
1395 | for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { |
1396 | if (ic_ntp_servers[i] != NONE) |
1397 | seq_printf(m: seq, fmt: "%pI4\n" , &ic_ntp_servers[i]); |
1398 | } |
1399 | return 0; |
1400 | } |
1401 | DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers); |
1402 | #endif /* CONFIG_PROC_FS */ |
1403 | |
1404 | /* |
1405 | * Extract IP address from the parameter string if needed. Note that we |
1406 | * need to have root_server_addr set _before_ IPConfig gets called as it |
1407 | * can override it. |
1408 | */ |
1409 | __be32 __init root_nfs_parse_addr(char *name) |
1410 | { |
1411 | __be32 addr; |
1412 | int octets = 0; |
1413 | char *cp, *cq; |
1414 | |
1415 | cp = cq = name; |
1416 | while (octets < 4) { |
1417 | while (*cp >= '0' && *cp <= '9') |
1418 | cp++; |
1419 | if (cp == cq || cp - cq > 3) |
1420 | break; |
1421 | if (*cp == '.' || octets == 3) |
1422 | octets++; |
1423 | if (octets < 4) |
1424 | cp++; |
1425 | cq = cp; |
1426 | } |
1427 | if (octets == 4 && (*cp == ':' || *cp == '\0')) { |
1428 | if (*cp == ':') |
1429 | *cp++ = '\0'; |
1430 | addr = in_aton(str: name); |
1431 | memmove(name, cp, strlen(cp) + 1); |
1432 | } else |
1433 | addr = NONE; |
1434 | |
1435 | return addr; |
1436 | } |
1437 | |
1438 | #define DEVICE_WAIT_MAX 12 /* 12 seconds */ |
1439 | |
1440 | static int __init wait_for_devices(void) |
1441 | { |
1442 | int i; |
1443 | bool try_init_devs = true; |
1444 | |
1445 | for (i = 0; i < DEVICE_WAIT_MAX; i++) { |
1446 | struct net_device *dev; |
1447 | int found = 0; |
1448 | |
1449 | /* make sure deferred device probes are finished */ |
1450 | wait_for_device_probe(); |
1451 | |
1452 | rtnl_lock(); |
1453 | for_each_netdev(&init_net, dev) { |
1454 | if (ic_is_init_dev(dev)) { |
1455 | found = 1; |
1456 | break; |
1457 | } |
1458 | } |
1459 | rtnl_unlock(); |
1460 | if (found) |
1461 | return 0; |
1462 | if (try_init_devs && |
1463 | (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) { |
1464 | try_init_devs = false; |
1465 | wait_for_init_devices_probe(); |
1466 | } |
1467 | ssleep(seconds: 1); |
1468 | } |
1469 | return -ENODEV; |
1470 | } |
1471 | |
1472 | /* |
1473 | * IP Autoconfig dispatcher. |
1474 | */ |
1475 | |
1476 | static int __init ip_auto_config(void) |
1477 | { |
1478 | __be32 addr; |
1479 | #ifdef IPCONFIG_DYNAMIC |
1480 | int retries = CONF_OPEN_RETRIES; |
1481 | #endif |
1482 | int err; |
1483 | unsigned int i, count; |
1484 | |
1485 | /* Initialise all name servers and NTP servers to NONE (but only if the |
1486 | * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, |
1487 | * otherwise we'll overwrite the IP addresses specified there) |
1488 | */ |
1489 | if (ic_set_manually == 0) { |
1490 | ic_nameservers_predef(); |
1491 | ic_ntp_servers_predef(); |
1492 | } |
1493 | |
1494 | #ifdef CONFIG_PROC_FS |
1495 | proc_create_single("pnp" , 0444, init_net.proc_net, pnp_seq_show); |
1496 | |
1497 | if (ipconfig_proc_net_init() == 0) |
1498 | ipconfig_proc_net_create(name: "ntp_servers" , proc_ops: &ntp_servers_proc_ops); |
1499 | #endif /* CONFIG_PROC_FS */ |
1500 | |
1501 | if (!ic_enable) |
1502 | return 0; |
1503 | |
1504 | pr_debug("IP-Config: Entered.\n" ); |
1505 | #ifdef IPCONFIG_DYNAMIC |
1506 | try_try_again: |
1507 | #endif |
1508 | /* Wait for devices to appear */ |
1509 | err = wait_for_devices(); |
1510 | if (err) |
1511 | return err; |
1512 | |
1513 | /* Setup all network devices */ |
1514 | err = ic_open_devs(); |
1515 | if (err) |
1516 | return err; |
1517 | |
1518 | /* Give drivers a chance to settle */ |
1519 | msleep(CONF_POST_OPEN); |
1520 | |
1521 | /* |
1522 | * If the config information is insufficient (e.g., our IP address or |
1523 | * IP address of the boot server is missing or we have multiple network |
1524 | * interfaces and no default was set), use BOOTP or RARP to get the |
1525 | * missing values. |
1526 | */ |
1527 | if (ic_myaddr == NONE || |
1528 | #if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT) |
1529 | (root_server_addr == NONE && |
1530 | ic_servaddr == NONE && |
1531 | (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) || |
1532 | #endif |
1533 | ic_first_dev->next) { |
1534 | #ifdef IPCONFIG_DYNAMIC |
1535 | if (ic_dynamic() < 0) { |
1536 | ic_close_devs(); |
1537 | |
1538 | /* |
1539 | * I don't know why, but sometimes the |
1540 | * eepro100 driver (at least) gets upset and |
1541 | * doesn't work the first time it's opened. |
1542 | * But then if you close it and reopen it, it |
1543 | * works just fine. So we need to try that at |
1544 | * least once before giving up. |
1545 | * |
1546 | * Also, if the root will be NFS-mounted, we |
1547 | * have nowhere to go if DHCP fails. So we |
1548 | * just have to keep trying forever. |
1549 | * |
1550 | * -- Chip |
1551 | */ |
1552 | #ifdef CONFIG_ROOT_NFS |
1553 | if (ROOT_DEV == Root_NFS) { |
1554 | pr_err("IP-Config: Retrying forever (NFS root)...\n" ); |
1555 | goto try_try_again; |
1556 | } |
1557 | #endif |
1558 | #ifdef CONFIG_CIFS_ROOT |
1559 | if (ROOT_DEV == Root_CIFS) { |
1560 | pr_err("IP-Config: Retrying forever (CIFS root)...\n" ); |
1561 | goto try_try_again; |
1562 | } |
1563 | #endif |
1564 | |
1565 | if (--retries) { |
1566 | pr_err("IP-Config: Reopening network devices...\n" ); |
1567 | goto try_try_again; |
1568 | } |
1569 | |
1570 | /* Oh, well. At least we tried. */ |
1571 | pr_err("IP-Config: Auto-configuration of network failed\n" ); |
1572 | return -1; |
1573 | } |
1574 | #else /* !DYNAMIC */ |
1575 | pr_err("IP-Config: Incomplete network configuration information\n" ); |
1576 | ic_close_devs(); |
1577 | return -1; |
1578 | #endif /* IPCONFIG_DYNAMIC */ |
1579 | } else { |
1580 | /* Device selected manually or only one device -> use it */ |
1581 | ic_dev = ic_first_dev; |
1582 | } |
1583 | |
1584 | addr = root_nfs_parse_addr(name: root_server_path); |
1585 | if (root_server_addr == NONE) |
1586 | root_server_addr = addr; |
1587 | |
1588 | /* |
1589 | * Use defaults wherever applicable. |
1590 | */ |
1591 | if (ic_defaults() < 0) |
1592 | return -1; |
1593 | |
1594 | /* |
1595 | * Record which protocol was actually used. |
1596 | */ |
1597 | #ifdef IPCONFIG_DYNAMIC |
1598 | ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); |
1599 | #endif |
1600 | |
1601 | #ifndef IPCONFIG_SILENT |
1602 | /* |
1603 | * Clue in the operator. |
1604 | */ |
1605 | pr_info("IP-Config: Complete:\n" ); |
1606 | |
1607 | pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n" , |
1608 | ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, |
1609 | &ic_myaddr, &ic_netmask, &ic_gateway); |
1610 | pr_info(" host=%s, domain=%s, nis-domain=%s\n" , |
1611 | utsname()->nodename, ic_domain, utsname()->domainname); |
1612 | pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s" , |
1613 | &ic_servaddr, &root_server_addr, root_server_path); |
1614 | if (ic_dev_mtu) |
1615 | pr_cont(", mtu=%d" , ic_dev_mtu); |
1616 | /* Name servers (if any): */ |
1617 | for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) { |
1618 | if (ic_nameservers[i] != NONE) { |
1619 | if (i == 0) |
1620 | pr_info(" nameserver%u=%pI4" , |
1621 | i, &ic_nameservers[i]); |
1622 | else |
1623 | pr_cont(", nameserver%u=%pI4" , |
1624 | i, &ic_nameservers[i]); |
1625 | |
1626 | count++; |
1627 | } |
1628 | if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0) |
1629 | pr_cont("\n" ); |
1630 | } |
1631 | /* NTP servers (if any): */ |
1632 | for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) { |
1633 | if (ic_ntp_servers[i] != NONE) { |
1634 | if (i == 0) |
1635 | pr_info(" ntpserver%u=%pI4" , |
1636 | i, &ic_ntp_servers[i]); |
1637 | else |
1638 | pr_cont(", ntpserver%u=%pI4" , |
1639 | i, &ic_ntp_servers[i]); |
1640 | |
1641 | count++; |
1642 | } |
1643 | if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0) |
1644 | pr_cont("\n" ); |
1645 | } |
1646 | #endif /* !SILENT */ |
1647 | |
1648 | /* |
1649 | * Close all network devices except the device we've |
1650 | * autoconfigured and set up routes. |
1651 | */ |
1652 | if (ic_setup_if() < 0 || ic_setup_routes() < 0) |
1653 | err = -1; |
1654 | else |
1655 | err = 0; |
1656 | |
1657 | ic_close_devs(); |
1658 | |
1659 | return err; |
1660 | } |
1661 | |
1662 | late_initcall(ip_auto_config); |
1663 | |
1664 | |
1665 | /* |
1666 | * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel |
1667 | * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst. |
1668 | */ |
1669 | static int __init ic_proto_name(char *name) |
1670 | { |
1671 | if (!strcmp(name, "on" ) || !strcmp(name, "any" )) { |
1672 | return 1; |
1673 | } |
1674 | if (!strcmp(name, "off" ) || !strcmp(name, "none" )) { |
1675 | return 0; |
1676 | } |
1677 | #ifdef CONFIG_IP_PNP_DHCP |
1678 | else if (!strncmp(name, "dhcp" , 4)) { |
1679 | char *client_id; |
1680 | |
1681 | ic_proto_enabled &= ~IC_RARP; |
1682 | client_id = strstr(name, "dhcp," ); |
1683 | if (client_id) { |
1684 | char *v; |
1685 | |
1686 | client_id = client_id + 5; |
1687 | v = strchr(client_id, ','); |
1688 | if (!v) |
1689 | return 1; |
1690 | *v = 0; |
1691 | if (kstrtou8(s: client_id, base: 0, res: dhcp_client_identifier)) |
1692 | pr_debug("DHCP: Invalid client identifier type\n" ); |
1693 | strncpy(p: dhcp_client_identifier + 1, q: v + 1, size: 251); |
1694 | *v = ','; |
1695 | } |
1696 | return 1; |
1697 | } |
1698 | #endif |
1699 | #ifdef CONFIG_IP_PNP_BOOTP |
1700 | else if (!strcmp(name, "bootp" )) { |
1701 | ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); |
1702 | return 1; |
1703 | } |
1704 | #endif |
1705 | #ifdef CONFIG_IP_PNP_RARP |
1706 | else if (!strcmp(name, "rarp" )) { |
1707 | ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); |
1708 | return 1; |
1709 | } |
1710 | #endif |
1711 | #ifdef IPCONFIG_DYNAMIC |
1712 | else if (!strcmp(name, "both" )) { |
1713 | ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ |
1714 | return 1; |
1715 | } |
1716 | #endif |
1717 | return 0; |
1718 | } |
1719 | |
1720 | static int __init ip_auto_config_setup(char *addrs) |
1721 | { |
1722 | char *cp, *ip, *dp; |
1723 | int num = 0; |
1724 | |
1725 | ic_set_manually = 1; |
1726 | ic_enable = 1; |
1727 | |
1728 | /* |
1729 | * If any dhcp, bootp etc options are set, leave autoconfig on |
1730 | * and skip the below static IP processing. |
1731 | */ |
1732 | if (ic_proto_name(name: addrs)) |
1733 | return 1; |
1734 | |
1735 | /* If no static IP is given, turn off autoconfig and bail. */ |
1736 | if (*addrs == 0 || |
1737 | strcmp(addrs, "off" ) == 0 || |
1738 | strcmp(addrs, "none" ) == 0) { |
1739 | ic_enable = 0; |
1740 | return 1; |
1741 | } |
1742 | |
1743 | /* Initialise all name servers and NTP servers to NONE */ |
1744 | ic_nameservers_predef(); |
1745 | ic_ntp_servers_predef(); |
1746 | |
1747 | /* Parse string for static IP assignment. */ |
1748 | ip = addrs; |
1749 | while (ip && *ip) { |
1750 | if ((cp = strchr(ip, ':'))) |
1751 | *cp++ = '\0'; |
1752 | if (strlen(ip) > 0) { |
1753 | pr_debug("IP-Config: Parameter #%d: `%s'\n" , num, ip); |
1754 | switch (num) { |
1755 | case 0: |
1756 | if ((ic_myaddr = in_aton(str: ip)) == ANY) |
1757 | ic_myaddr = NONE; |
1758 | break; |
1759 | case 1: |
1760 | if ((ic_servaddr = in_aton(str: ip)) == ANY) |
1761 | ic_servaddr = NONE; |
1762 | break; |
1763 | case 2: |
1764 | if ((ic_gateway = in_aton(str: ip)) == ANY) |
1765 | ic_gateway = NONE; |
1766 | break; |
1767 | case 3: |
1768 | if ((ic_netmask = in_aton(str: ip)) == ANY) |
1769 | ic_netmask = NONE; |
1770 | break; |
1771 | case 4: |
1772 | if ((dp = strchr(ip, '.'))) { |
1773 | *dp++ = '\0'; |
1774 | strscpy(p: utsname()->domainname, q: dp, |
1775 | size: sizeof(utsname()->domainname)); |
1776 | } |
1777 | strscpy(p: utsname()->nodename, q: ip, |
1778 | size: sizeof(utsname()->nodename)); |
1779 | ic_host_name_set = 1; |
1780 | break; |
1781 | case 5: |
1782 | strscpy(p: user_dev_name, q: ip, size: sizeof(user_dev_name)); |
1783 | break; |
1784 | case 6: |
1785 | if (ic_proto_name(name: ip) == 0 && |
1786 | ic_myaddr == NONE) { |
1787 | ic_enable = 0; |
1788 | } |
1789 | break; |
1790 | case 7: |
1791 | if (CONF_NAMESERVERS_MAX >= 1) { |
1792 | ic_nameservers[0] = in_aton(str: ip); |
1793 | if (ic_nameservers[0] == ANY) |
1794 | ic_nameservers[0] = NONE; |
1795 | } |
1796 | break; |
1797 | case 8: |
1798 | if (CONF_NAMESERVERS_MAX >= 2) { |
1799 | ic_nameservers[1] = in_aton(str: ip); |
1800 | if (ic_nameservers[1] == ANY) |
1801 | ic_nameservers[1] = NONE; |
1802 | } |
1803 | break; |
1804 | case 9: |
1805 | if (CONF_NTP_SERVERS_MAX >= 1) { |
1806 | ic_ntp_servers[0] = in_aton(str: ip); |
1807 | if (ic_ntp_servers[0] == ANY) |
1808 | ic_ntp_servers[0] = NONE; |
1809 | } |
1810 | break; |
1811 | } |
1812 | } |
1813 | ip = cp; |
1814 | num++; |
1815 | } |
1816 | |
1817 | return 1; |
1818 | } |
1819 | __setup("ip=" , ip_auto_config_setup); |
1820 | |
1821 | static int __init nfsaddrs_config_setup(char *addrs) |
1822 | { |
1823 | return ip_auto_config_setup(addrs); |
1824 | } |
1825 | __setup("nfsaddrs=" , nfsaddrs_config_setup); |
1826 | |
1827 | static int __init vendor_class_identifier_setup(char *addrs) |
1828 | { |
1829 | if (strscpy(p: vendor_class_identifier, q: addrs, |
1830 | size: sizeof(vendor_class_identifier)) |
1831 | >= sizeof(vendor_class_identifier)) |
1832 | pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n" , |
1833 | vendor_class_identifier); |
1834 | return 1; |
1835 | } |
1836 | __setup("dhcpclass=" , vendor_class_identifier_setup); |
1837 | |
1838 | static int __init set_carrier_timeout(char *str) |
1839 | { |
1840 | ssize_t ret; |
1841 | |
1842 | if (!str) |
1843 | return 0; |
1844 | |
1845 | ret = kstrtouint(s: str, base: 0, res: &carrier_timeout); |
1846 | if (ret) |
1847 | return 0; |
1848 | |
1849 | return 1; |
1850 | } |
1851 | __setup("carrier_timeout=" , set_carrier_timeout); |
1852 | |