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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
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 | |
e905a9ed | 14 | * |
1da177e4 LT |
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 | |
c04d2cb2 CN |
31 | * |
32 | * NTP servers in /proc/net/ipconfig/ntp_servers | |
33 | * -- Chris Novakovic <chris@chrisn.me.uk>, April 2018 | |
1da177e4 LT |
34 | */ |
35 | ||
1da177e4 LT |
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> | |
14c85021 | 46 | #include <linux/inetdevice.h> |
1da177e4 LT |
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> | |
43d60661 | 59 | #include <linux/nfs_fs.h> |
5a0e3ad6 | 60 | #include <linux/slab.h> |
bc3b2d7f | 61 | #include <linux/export.h> |
457c4cbc | 62 | #include <net/net_namespace.h> |
1da177e4 LT |
63 | #include <net/arp.h> |
64 | #include <net/ip.h> | |
65 | #include <net/ipconfig.h> | |
14c85021 | 66 | #include <net/route.h> |
1da177e4 | 67 | |
7c0f6ba6 | 68 | #include <linux/uaccess.h> |
1da177e4 LT |
69 | #include <net/checksum.h> |
70 | #include <asm/processor.h> | |
71 | ||
1da177e4 LT |
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 */ | |
3fb72f1e | 86 | #define CONF_POST_OPEN 10 /* After opening: 10 msecs */ |
1da177e4 LT |
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 */ | |
1da177e4 LT |
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 */ | |
e905a9ed YH |
95 | #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers |
96 | - '3' from resolv.h */ | |
c04d2cb2 | 97 | #define CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */ |
1da177e4 | 98 | |
09640e63 HH |
99 | #define NONE cpu_to_be32(INADDR_NONE) |
100 | #define ANY cpu_to_be32(INADDR_ANY) | |
1da177e4 | 101 | |
3fc46fc9 MK |
102 | /* Wait for carrier timeout default in seconds */ |
103 | static unsigned int carrier_timeout = 120; | |
104 | ||
1da177e4 LT |
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 | ||
0d3979b9 | 115 | static int ic_enable __initdata; /* IP config enabled? */ |
1da177e4 LT |
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 | ||
0d3979b9 | 130 | static int ic_host_name_set __initdata; /* Host name set by us? */ |
1da177e4 | 131 | |
5a874db4 AV |
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 */ | |
1da177e4 | 135 | |
86ef7f9c | 136 | #ifdef IPCONFIG_DYNAMIC |
0b392be9 | 137 | static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ |
86ef7f9c | 138 | #endif |
9dd4a13a | 139 | |
5a874db4 | 140 | __be32 ic_servaddr = NONE; /* Boot server IP address */ |
1da177e4 | 141 | |
5a874db4 | 142 | __be32 root_server_addr = NONE; /* Address of NFS server */ |
1da177e4 LT |
143 | u8 root_server_path[256] = { 0, }; /* Path to mount as root */ |
144 | ||
1b0b04f9 DM |
145 | /* vendor class identifier */ |
146 | static char vendor_class_identifier[253] __initdata; | |
62013dbb | 147 | |
26fb342c LR |
148 | #if defined(CONFIG_IP_PNP_DHCP) |
149 | static char dhcp_client_identifier[253] __initdata; | |
150 | #endif | |
151 | ||
1da177e4 LT |
152 | /* Persistent data: */ |
153 | ||
52b79e2b | 154 | #ifdef IPCONFIG_DYNAMIC |
1da177e4 | 155 | static int ic_proto_used; /* Protocol used, if any */ |
52b79e2b AB |
156 | #else |
157 | #define ic_proto_used 0 | |
158 | #endif | |
5a874db4 | 159 | static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ |
c04d2cb2 | 160 | static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */ |
1da177e4 LT |
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 */ | |
0d3979b9 | 171 | static int ic_proto_have_if __initdata; |
1da177e4 | 172 | |
9643f455 | 173 | /* MTU for boot device */ |
0d3979b9 | 174 | static int ic_dev_mtu __initdata; |
9643f455 | 175 | |
1da177e4 LT |
176 | #ifdef IPCONFIG_DYNAMIC |
177 | static DEFINE_SPINLOCK(ic_recv_lock); | |
0d3979b9 | 178 | static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ |
1da177e4 LT |
179 | #endif |
180 | #ifdef IPCONFIG_DHCP | |
0d3979b9 | 181 | static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ |
1da177e4 LT |
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; | |
5a874db4 | 194 | __be32 xid; |
1da177e4 LT |
195 | }; |
196 | ||
0d3979b9 | 197 | static struct ic_device *ic_first_dev __initdata; /* List of open device */ |
2647cffb | 198 | static struct ic_device *ic_dev __initdata; /* Selected device */ |
1da177e4 | 199 | |
3fb72f1e | 200 | static bool __init ic_is_init_dev(struct net_device *dev) |
964ad81c | 201 | { |
3fb72f1e MN |
202 | if (dev->flags & IFF_LOOPBACK) |
203 | return false; | |
204 | return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : | |
964ad81c DM |
205 | (!(dev->flags & IFF_LOOPBACK) && |
206 | (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && | |
3fb72f1e | 207 | strncmp(dev->name, "dummy", 5)); |
964ad81c DM |
208 | } |
209 | ||
1da177e4 LT |
210 | static int __init ic_open_devs(void) |
211 | { | |
212 | struct ic_device *d, **last; | |
213 | struct net_device *dev; | |
214 | unsigned short oflags; | |
5e404cd6 | 215 | unsigned long start, next_msg; |
1da177e4 LT |
216 | |
217 | last = &ic_first_dev; | |
6756ae4b | 218 | rtnl_lock(); |
1da177e4 | 219 | |
46acf7bd | 220 | /* bring loopback device up first */ |
0cc217e1 | 221 | for_each_netdev(&init_net, dev) { |
46acf7bd | 222 | if (!(dev->flags & IFF_LOOPBACK)) |
0cc217e1 | 223 | continue; |
567c5e13 | 224 | if (dev_change_flags(dev, dev->flags | IFF_UP, NULL) < 0) |
058bd4d2 | 225 | pr_err("IP-Config: Failed to open %s\n", dev->name); |
0cc217e1 | 226 | } |
1da177e4 | 227 | |
881d966b | 228 | for_each_netdev(&init_net, dev) { |
3fb72f1e | 229 | if (ic_is_init_dev(dev)) { |
1da177e4 LT |
230 | int able = 0; |
231 | if (dev->mtu >= 364) | |
232 | able |= IC_BOOTP; | |
233 | else | |
09605cc1 | 234 | pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", |
058bd4d2 | 235 | dev->name, dev->mtu); |
1da177e4 LT |
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; | |
567c5e13 | 242 | if (dev_change_flags(dev, oflags | IFF_UP, NULL) < 0) { |
058bd4d2 JP |
243 | pr_err("IP-Config: Failed to open %s\n", |
244 | dev->name); | |
1da177e4 LT |
245 | continue; |
246 | } | |
247 | if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { | |
6756ae4b | 248 | rtnl_unlock(); |
964ad81c | 249 | return -ENOMEM; |
1da177e4 LT |
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) | |
5a874db4 | 257 | get_random_bytes(&d->xid, sizeof(__be32)); |
1da177e4 LT |
258 | else |
259 | d->xid = 0; | |
260 | ic_proto_have_if |= able; | |
09605cc1 BS |
261 | pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", |
262 | dev->name, able, d->xid); | |
1da177e4 LT |
263 | } |
264 | } | |
3fb72f1e | 265 | |
cd7816d1 GF |
266 | /* no point in waiting if we could not bring up at least one device */ |
267 | if (!ic_first_dev) | |
268 | goto have_carrier; | |
269 | ||
3fb72f1e MN |
270 | /* wait for a carrier on at least one device */ |
271 | start = jiffies; | |
3fc46fc9 | 272 | next_msg = start + msecs_to_jiffies(20000); |
c72c95a0 | 273 | while (time_before(jiffies, start + |
3fc46fc9 | 274 | msecs_to_jiffies(carrier_timeout * 1000))) { |
5e404cd6 PG |
275 | int wait, elapsed; |
276 | ||
3fb72f1e MN |
277 | for_each_netdev(&init_net, dev) |
278 | if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) | |
279 | goto have_carrier; | |
280 | ||
281 | msleep(1); | |
5e404cd6 | 282 | |
357137a4 | 283 | if (time_before(jiffies, next_msg)) |
5e404cd6 PG |
284 | continue; |
285 | ||
286 | elapsed = jiffies_to_msecs(jiffies - start); | |
3fc46fc9 | 287 | wait = (carrier_timeout * 1000 - elapsed + 500) / 1000; |
5e404cd6 | 288 | pr_info("Waiting up to %d more seconds for network.\n", wait); |
3fc46fc9 | 289 | next_msg = jiffies + msecs_to_jiffies(20000); |
3fb72f1e MN |
290 | } |
291 | have_carrier: | |
6756ae4b | 292 | rtnl_unlock(); |
1da177e4 LT |
293 | |
294 | *last = NULL; | |
295 | ||
296 | if (!ic_first_dev) { | |
297 | if (user_dev_name[0]) | |
058bd4d2 JP |
298 | pr_err("IP-Config: Device `%s' not found\n", |
299 | user_dev_name); | |
1da177e4 | 300 | else |
058bd4d2 | 301 | pr_err("IP-Config: No network devices available\n"); |
964ad81c | 302 | return -ENODEV; |
1da177e4 LT |
303 | } |
304 | return 0; | |
305 | } | |
306 | ||
46acf7bd VO |
307 | /* Close all network interfaces except the one we've autoconfigured, and its |
308 | * lowers, in case it's a stacked virtual interface. | |
309 | */ | |
1da177e4 LT |
310 | static void __init ic_close_devs(void) |
311 | { | |
a50a151e | 312 | struct net_device *selected_dev = ic_dev ? ic_dev->dev : NULL; |
1da177e4 LT |
313 | struct ic_device *d, *next; |
314 | struct net_device *dev; | |
315 | ||
6756ae4b | 316 | rtnl_lock(); |
1da177e4 LT |
317 | next = ic_first_dev; |
318 | while ((d = next)) { | |
46acf7bd | 319 | bool bring_down = (d != ic_dev); |
a50a151e | 320 | struct net_device *lower; |
46acf7bd VO |
321 | struct list_head *iter; |
322 | ||
1da177e4 LT |
323 | next = d->next; |
324 | dev = d->dev; | |
46acf7bd | 325 | |
a50a151e VO |
326 | if (selected_dev) { |
327 | netdev_for_each_lower_dev(selected_dev, lower, iter) { | |
328 | if (dev == lower) { | |
329 | bring_down = false; | |
330 | break; | |
331 | } | |
46acf7bd VO |
332 | } |
333 | } | |
334 | if (bring_down) { | |
09605cc1 | 335 | pr_debug("IP-Config: Downing %s\n", dev->name); |
567c5e13 | 336 | dev_change_flags(dev, d->flags, NULL); |
1da177e4 LT |
337 | } |
338 | kfree(d); | |
339 | } | |
6756ae4b | 340 | rtnl_unlock(); |
1da177e4 LT |
341 | } |
342 | ||
343 | /* | |
344 | * Interface to various network functions. | |
345 | */ | |
346 | ||
347 | static inline void | |
5a874db4 | 348 | set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) |
1da177e4 LT |
349 | { |
350 | sin->sin_family = AF_INET; | |
351 | sin->sin_addr.s_addr = addr; | |
352 | sin->sin_port = port; | |
353 | } | |
354 | ||
1da177e4 LT |
355 | /* |
356 | * Set up interface addresses and routes. | |
357 | */ | |
358 | ||
359 | static int __init ic_setup_if(void) | |
360 | { | |
361 | struct ifreq ir; | |
362 | struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; | |
363 | int err; | |
364 | ||
365 | memset(&ir, 0, sizeof(ir)); | |
2647cffb | 366 | strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); |
1da177e4 | 367 | set_sockaddr(sin, ic_myaddr, 0); |
03aef17b | 368 | if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) { |
058bd4d2 JP |
369 | pr_err("IP-Config: Unable to set interface address (%d)\n", |
370 | err); | |
1da177e4 LT |
371 | return -1; |
372 | } | |
373 | set_sockaddr(sin, ic_netmask, 0); | |
03aef17b | 374 | if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) { |
058bd4d2 JP |
375 | pr_err("IP-Config: Unable to set interface netmask (%d)\n", |
376 | err); | |
1da177e4 LT |
377 | return -1; |
378 | } | |
379 | set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); | |
03aef17b | 380 | if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) { |
058bd4d2 JP |
381 | pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", |
382 | err); | |
1da177e4 LT |
383 | return -1; |
384 | } | |
9643f455 CF |
385 | /* Handle the case where we need non-standard MTU on the boot link (a network |
386 | * using jumbo frames, for instance). If we can't set the mtu, don't error | |
387 | * out, we'll try to muddle along. | |
388 | */ | |
389 | if (ic_dev_mtu != 0) { | |
6a88fbe7 AV |
390 | rtnl_lock(); |
391 | if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) | |
058bd4d2 JP |
392 | pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", |
393 | ic_dev_mtu, err); | |
6a88fbe7 | 394 | rtnl_unlock(); |
9643f455 | 395 | } |
1da177e4 LT |
396 | return 0; |
397 | } | |
398 | ||
399 | static int __init ic_setup_routes(void) | |
400 | { | |
401 | /* No need to setup device routes, only the default route... */ | |
402 | ||
5a874db4 | 403 | if (ic_gateway != NONE) { |
1da177e4 LT |
404 | struct rtentry rm; |
405 | int err; | |
406 | ||
407 | memset(&rm, 0, sizeof(rm)); | |
408 | if ((ic_gateway ^ ic_myaddr) & ic_netmask) { | |
058bd4d2 | 409 | pr_err("IP-Config: Gateway not on directly connected network\n"); |
1da177e4 LT |
410 | return -1; |
411 | } | |
412 | set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); | |
413 | set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); | |
414 | set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); | |
415 | rm.rt_flags = RTF_UP | RTF_GATEWAY; | |
ca25c300 | 416 | if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { |
058bd4d2 JP |
417 | pr_err("IP-Config: Cannot add default route (%d)\n", |
418 | err); | |
1da177e4 LT |
419 | return -1; |
420 | } | |
421 | } | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | /* | |
427 | * Fill in default values for all missing parameters. | |
428 | */ | |
429 | ||
430 | static int __init ic_defaults(void) | |
431 | { | |
432 | /* | |
433 | * At this point we have no userspace running so need not | |
434 | * claim locks on system_utsname | |
435 | */ | |
e905a9ed | 436 | |
1da177e4 | 437 | if (!ic_host_name_set) |
673d57e7 | 438 | sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); |
1da177e4 | 439 | |
5a874db4 | 440 | if (root_server_addr == NONE) |
1da177e4 LT |
441 | root_server_addr = ic_servaddr; |
442 | ||
5a874db4 | 443 | if (ic_netmask == NONE) { |
1da177e4 LT |
444 | if (IN_CLASSA(ntohl(ic_myaddr))) |
445 | ic_netmask = htonl(IN_CLASSA_NET); | |
446 | else if (IN_CLASSB(ntohl(ic_myaddr))) | |
447 | ic_netmask = htonl(IN_CLASSB_NET); | |
448 | else if (IN_CLASSC(ntohl(ic_myaddr))) | |
449 | ic_netmask = htonl(IN_CLASSC_NET); | |
65cab850 DT |
450 | else if (IN_CLASSE(ntohl(ic_myaddr))) |
451 | ic_netmask = htonl(IN_CLASSE_NET); | |
1da177e4 | 452 | else { |
058bd4d2 JP |
453 | pr_err("IP-Config: Unable to guess netmask for address %pI4\n", |
454 | &ic_myaddr); | |
1da177e4 LT |
455 | return -1; |
456 | } | |
09605cc1 BS |
457 | pr_notice("IP-Config: Guessing netmask %pI4\n", |
458 | &ic_netmask); | |
1da177e4 LT |
459 | } |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | /* | |
465 | * RARP support. | |
466 | */ | |
467 | ||
468 | #ifdef IPCONFIG_RARP | |
469 | ||
f2ccd8fa | 470 | static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
471 | |
472 | static struct packet_type rarp_packet_type __initdata = { | |
09640e63 | 473 | .type = cpu_to_be16(ETH_P_RARP), |
1da177e4 LT |
474 | .func = ic_rarp_recv, |
475 | }; | |
476 | ||
45e741b8 | 477 | static inline void __init ic_rarp_init(void) |
1da177e4 LT |
478 | { |
479 | dev_add_pack(&rarp_packet_type); | |
480 | } | |
481 | ||
45e741b8 | 482 | static inline void __init ic_rarp_cleanup(void) |
1da177e4 LT |
483 | { |
484 | dev_remove_pack(&rarp_packet_type); | |
485 | } | |
486 | ||
487 | /* | |
488 | * Process received RARP packet. | |
489 | */ | |
490 | static int __init | |
f2ccd8fa | 491 | ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
492 | { |
493 | struct arphdr *rarp; | |
494 | unsigned char *rarp_ptr; | |
5a874db4 | 495 | __be32 sip, tip; |
6b436d33 | 496 | unsigned char *tha; /* t for "target" */ |
1da177e4 LT |
497 | struct ic_device *d; |
498 | ||
721499e8 | 499 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
500 | goto drop; |
501 | ||
51456b29 IM |
502 | skb = skb_share_check(skb, GFP_ATOMIC); |
503 | if (!skb) | |
1da177e4 LT |
504 | return NET_RX_DROP; |
505 | ||
506 | if (!pskb_may_pull(skb, sizeof(struct arphdr))) | |
507 | goto drop; | |
508 | ||
509 | /* Basic sanity checks can be done without the lock. */ | |
9c70220b | 510 | rarp = (struct arphdr *)skb_transport_header(skb); |
1da177e4 LT |
511 | |
512 | /* If this test doesn't pass, it's not IP, or we should | |
513 | * ignore it anyway. | |
514 | */ | |
515 | if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) | |
516 | goto drop; | |
517 | ||
518 | /* If it's not a RARP reply, delete it. */ | |
519 | if (rarp->ar_op != htons(ARPOP_RREPLY)) | |
520 | goto drop; | |
521 | ||
522 | /* If it's not Ethernet, delete it. */ | |
523 | if (rarp->ar_pro != htons(ETH_P_IP)) | |
524 | goto drop; | |
525 | ||
988b7050 | 526 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) |
1da177e4 LT |
527 | goto drop; |
528 | ||
529 | /* OK, it is all there and looks valid, process... */ | |
9c70220b | 530 | rarp = (struct arphdr *)skb_transport_header(skb); |
1da177e4 LT |
531 | rarp_ptr = (unsigned char *) (rarp + 1); |
532 | ||
533 | /* One reply at a time, please. */ | |
534 | spin_lock(&ic_recv_lock); | |
535 | ||
536 | /* If we already have a reply, just drop the packet */ | |
537 | if (ic_got_reply) | |
538 | goto drop_unlock; | |
539 | ||
540 | /* Find the ic_device that the packet arrived on */ | |
541 | d = ic_first_dev; | |
542 | while (d && d->dev != dev) | |
543 | d = d->next; | |
544 | if (!d) | |
545 | goto drop_unlock; /* should never happen */ | |
546 | ||
547 | /* Extract variable-width fields */ | |
1da177e4 LT |
548 | rarp_ptr += dev->addr_len; |
549 | memcpy(&sip, rarp_ptr, 4); | |
550 | rarp_ptr += 4; | |
551 | tha = rarp_ptr; | |
552 | rarp_ptr += dev->addr_len; | |
553 | memcpy(&tip, rarp_ptr, 4); | |
554 | ||
555 | /* Discard packets which are not meant for us. */ | |
556 | if (memcmp(tha, dev->dev_addr, dev->addr_len)) | |
557 | goto drop_unlock; | |
558 | ||
559 | /* Discard packets which are not from specified server. */ | |
5a874db4 | 560 | if (ic_servaddr != NONE && ic_servaddr != sip) |
1da177e4 LT |
561 | goto drop_unlock; |
562 | ||
563 | /* We have a winner! */ | |
2647cffb | 564 | ic_dev = d; |
5a874db4 | 565 | if (ic_myaddr == NONE) |
1da177e4 LT |
566 | ic_myaddr = tip; |
567 | ic_servaddr = sip; | |
9dd4a13a | 568 | ic_addrservaddr = sip; |
1da177e4 LT |
569 | ic_got_reply = IC_RARP; |
570 | ||
571 | drop_unlock: | |
572 | /* Show's over. Nothing to see here. */ | |
573 | spin_unlock(&ic_recv_lock); | |
574 | ||
575 | drop: | |
576 | /* Throw the packet out. */ | |
577 | kfree_skb(skb); | |
578 | return 0; | |
579 | } | |
580 | ||
581 | ||
582 | /* | |
583 | * Send RARP request packet over a single interface. | |
584 | */ | |
585 | static void __init ic_rarp_send_if(struct ic_device *d) | |
586 | { | |
587 | struct net_device *dev = d->dev; | |
588 | arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, | |
589 | dev->dev_addr, dev->dev_addr); | |
590 | } | |
591 | #endif | |
592 | ||
842b08bb AS |
593 | /* |
594 | * Predefine Nameservers | |
595 | */ | |
596 | static inline void __init ic_nameservers_predef(void) | |
597 | { | |
598 | int i; | |
599 | ||
600 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) | |
601 | ic_nameservers[i] = NONE; | |
602 | } | |
603 | ||
c04d2cb2 CN |
604 | /* Predefine NTP servers */ |
605 | static inline void __init ic_ntp_servers_predef(void) | |
606 | { | |
607 | int i; | |
608 | ||
609 | for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) | |
610 | ic_ntp_servers[i] = NONE; | |
611 | } | |
612 | ||
1da177e4 LT |
613 | /* |
614 | * DHCP/BOOTP support. | |
615 | */ | |
616 | ||
617 | #ifdef IPCONFIG_BOOTP | |
618 | ||
619 | struct bootp_pkt { /* BOOTP packet format */ | |
620 | struct iphdr iph; /* IP header */ | |
621 | struct udphdr udph; /* UDP header */ | |
622 | u8 op; /* 1=request, 2=reply */ | |
623 | u8 htype; /* HW address type */ | |
624 | u8 hlen; /* HW address length */ | |
625 | u8 hops; /* Used only by gateways */ | |
5a874db4 AV |
626 | __be32 xid; /* Transaction ID */ |
627 | __be16 secs; /* Seconds since we started */ | |
628 | __be16 flags; /* Just what it says */ | |
629 | __be32 client_ip; /* Client's IP address if known */ | |
630 | __be32 your_ip; /* Assigned IP address */ | |
631 | __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ | |
632 | __be32 relay_ip; /* IP address of BOOTP relay */ | |
1da177e4 LT |
633 | u8 hw_addr[16]; /* Client's HW address */ |
634 | u8 serv_name[64]; /* Server host name */ | |
635 | u8 boot_file[128]; /* Name of boot file */ | |
636 | u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ | |
637 | }; | |
638 | ||
639 | /* packet ops */ | |
640 | #define BOOTP_REQUEST 1 | |
641 | #define BOOTP_REPLY 2 | |
642 | ||
643 | /* DHCP message types */ | |
644 | #define DHCPDISCOVER 1 | |
645 | #define DHCPOFFER 2 | |
646 | #define DHCPREQUEST 3 | |
647 | #define DHCPDECLINE 4 | |
648 | #define DHCPACK 5 | |
649 | #define DHCPNAK 6 | |
650 | #define DHCPRELEASE 7 | |
651 | #define DHCPINFORM 8 | |
652 | ||
f2ccd8fa | 653 | static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
654 | |
655 | static struct packet_type bootp_packet_type __initdata = { | |
09640e63 | 656 | .type = cpu_to_be16(ETH_P_IP), |
1da177e4 LT |
657 | .func = ic_bootp_recv, |
658 | }; | |
659 | ||
1da177e4 LT |
660 | /* |
661 | * Initialize DHCP/BOOTP extension fields in the request. | |
662 | */ | |
663 | ||
664 | static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; | |
665 | ||
666 | #ifdef IPCONFIG_DHCP | |
667 | ||
668 | static void __init | |
22fc5388 | 669 | ic_dhcp_init_options(u8 *options, struct ic_device *d) |
1da177e4 | 670 | { |
5a874db4 | 671 | u8 mt = ((ic_servaddr == NONE) |
1da177e4 LT |
672 | ? DHCPDISCOVER : DHCPREQUEST); |
673 | u8 *e = options; | |
62013dbb | 674 | int len; |
1da177e4 | 675 | |
22fc5388 | 676 | pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); |
1da177e4 LT |
677 | |
678 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ | |
679 | e += 4; | |
680 | ||
681 | *e++ = 53; /* DHCP message type */ | |
682 | *e++ = 1; | |
683 | *e++ = mt; | |
684 | ||
685 | if (mt == DHCPREQUEST) { | |
686 | *e++ = 54; /* Server ID (IP address) */ | |
687 | *e++ = 4; | |
688 | memcpy(e, &ic_servaddr, 4); | |
689 | e += 4; | |
690 | ||
691 | *e++ = 50; /* Requested IP address */ | |
692 | *e++ = 4; | |
693 | memcpy(e, &ic_myaddr, 4); | |
694 | e += 4; | |
695 | } | |
696 | ||
697 | /* always? */ | |
698 | { | |
699 | static const u8 ic_req_params[] = { | |
700 | 1, /* Subnet mask */ | |
701 | 3, /* Default gateway */ | |
702 | 6, /* DNS server */ | |
703 | 12, /* Host name */ | |
704 | 15, /* Domain name */ | |
705 | 17, /* Boot path */ | |
9643f455 | 706 | 26, /* MTU */ |
1da177e4 | 707 | 40, /* NIS domain name */ |
c04d2cb2 | 708 | 42, /* NTP servers */ |
1da177e4 LT |
709 | }; |
710 | ||
711 | *e++ = 55; /* Parameter request list */ | |
712 | *e++ = sizeof(ic_req_params); | |
713 | memcpy(e, ic_req_params, sizeof(ic_req_params)); | |
714 | e += sizeof(ic_req_params); | |
62013dbb | 715 | |
130c0f47 WF |
716 | if (ic_host_name_set) { |
717 | *e++ = 12; /* host-name */ | |
718 | len = strlen(utsname()->nodename); | |
719 | *e++ = len; | |
720 | memcpy(e, utsname()->nodename, len); | |
721 | e += len; | |
722 | } | |
62013dbb | 723 | if (*vendor_class_identifier) { |
058bd4d2 JP |
724 | pr_info("DHCP: sending class identifier \"%s\"\n", |
725 | vendor_class_identifier); | |
62013dbb RJ |
726 | *e++ = 60; /* Class-identifier */ |
727 | len = strlen(vendor_class_identifier); | |
728 | *e++ = len; | |
729 | memcpy(e, vendor_class_identifier, len); | |
730 | e += len; | |
731 | } | |
26fb342c LR |
732 | len = strlen(dhcp_client_identifier + 1); |
733 | /* the minimum length of identifier is 2, include 1 byte type, | |
734 | * and can not be larger than the length of options | |
735 | */ | |
736 | if (len >= 1 && len < 312 - (e - options) - 1) { | |
737 | *e++ = 61; | |
738 | *e++ = len + 1; | |
739 | memcpy(e, dhcp_client_identifier, len + 1); | |
740 | e += len + 1; | |
741 | } | |
1da177e4 LT |
742 | } |
743 | ||
744 | *e++ = 255; /* End of the list */ | |
745 | } | |
746 | ||
747 | #endif /* IPCONFIG_DHCP */ | |
748 | ||
749 | static void __init ic_bootp_init_ext(u8 *e) | |
750 | { | |
751 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ | |
752 | e += 4; | |
753 | *e++ = 1; /* Subnet mask request */ | |
754 | *e++ = 4; | |
755 | e += 4; | |
756 | *e++ = 3; /* Default gateway request */ | |
757 | *e++ = 4; | |
758 | e += 4; | |
de1fa15b | 759 | #if CONF_NAMESERVERS_MAX > 0 |
4e1a8af2 | 760 | *e++ = 6; /* (DNS) name server request */ |
de1fa15b CN |
761 | *e++ = 4 * CONF_NAMESERVERS_MAX; |
762 | e += 4 * CONF_NAMESERVERS_MAX; | |
763 | #endif | |
1da177e4 LT |
764 | *e++ = 12; /* Host name request */ |
765 | *e++ = 32; | |
766 | e += 32; | |
767 | *e++ = 40; /* NIS Domain name request */ | |
768 | *e++ = 32; | |
769 | e += 32; | |
770 | *e++ = 17; /* Boot path */ | |
771 | *e++ = 40; | |
772 | e += 40; | |
773 | ||
e905a9ed | 774 | *e++ = 57; /* set extension buffer size for reply */ |
1da177e4 | 775 | *e++ = 2; |
e905a9ed | 776 | *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ |
1da177e4 LT |
777 | *e++ = 150; |
778 | ||
779 | *e++ = 255; /* End of the list */ | |
780 | } | |
781 | ||
782 | ||
5e953778 CF |
783 | /* |
784 | * Initialize the DHCP/BOOTP mechanism. | |
785 | */ | |
786 | static inline void __init ic_bootp_init(void) | |
787 | { | |
c04d2cb2 CN |
788 | /* Re-initialise all name servers and NTP servers to NONE, in case any |
789 | * were set via the "ip=" or "nfsaddrs=" kernel command line parameters: | |
790 | * any IP addresses specified there will already have been decoded but | |
791 | * are no longer needed | |
300eec7c | 792 | */ |
5e953778 | 793 | ic_nameservers_predef(); |
c04d2cb2 | 794 | ic_ntp_servers_predef(); |
1da177e4 LT |
795 | |
796 | dev_add_pack(&bootp_packet_type); | |
797 | } | |
798 | ||
799 | ||
800 | /* | |
801 | * DHCP/BOOTP cleanup. | |
802 | */ | |
45e741b8 | 803 | static inline void __init ic_bootp_cleanup(void) |
1da177e4 LT |
804 | { |
805 | dev_remove_pack(&bootp_packet_type); | |
806 | } | |
807 | ||
808 | ||
809 | /* | |
810 | * Send DHCP/BOOTP request to single interface. | |
811 | */ | |
812 | static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) | |
813 | { | |
814 | struct net_device *dev = d->dev; | |
815 | struct sk_buff *skb; | |
816 | struct bootp_pkt *b; | |
1da177e4 | 817 | struct iphdr *h; |
66088243 HX |
818 | int hlen = LL_RESERVED_SPACE(dev); |
819 | int tlen = dev->needed_tailroom; | |
1da177e4 LT |
820 | |
821 | /* Allocate packet */ | |
66088243 | 822 | skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, |
f5184d26 | 823 | GFP_KERNEL); |
1da177e4 LT |
824 | if (!skb) |
825 | return; | |
66088243 | 826 | skb_reserve(skb, hlen); |
b080db58 | 827 | b = skb_put_zero(skb, sizeof(struct bootp_pkt)); |
1da177e4 LT |
828 | |
829 | /* Construct IP header */ | |
04b964db | 830 | skb_reset_network_header(skb); |
eddc9ec5 | 831 | h = ip_hdr(skb); |
1da177e4 LT |
832 | h->version = 4; |
833 | h->ihl = 5; | |
834 | h->tot_len = htons(sizeof(struct bootp_pkt)); | |
835 | h->frag_off = htons(IP_DF); | |
836 | h->ttl = 64; | |
837 | h->protocol = IPPROTO_UDP; | |
5a874db4 | 838 | h->daddr = htonl(INADDR_BROADCAST); |
1da177e4 LT |
839 | h->check = ip_fast_csum((unsigned char *) h, h->ihl); |
840 | ||
841 | /* Construct UDP header */ | |
842 | b->udph.source = htons(68); | |
843 | b->udph.dest = htons(67); | |
844 | b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); | |
845 | /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ | |
846 | ||
847 | /* Construct DHCP/BOOTP header */ | |
848 | b->op = BOOTP_REQUEST; | |
849 | if (dev->type < 256) /* check for false types */ | |
850 | b->htype = dev->type; | |
1da177e4 LT |
851 | else if (dev->type == ARPHRD_FDDI) |
852 | b->htype = ARPHRD_ETHER; | |
853 | else { | |
09605cc1 BS |
854 | pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, |
855 | dev->name); | |
1da177e4 LT |
856 | b->htype = dev->type; /* can cause undefined behavior */ |
857 | } | |
dea75bdf SH |
858 | |
859 | /* server_ip and your_ip address are both already zero per RFC2131 */ | |
1da177e4 | 860 | b->hlen = dev->addr_len; |
1da177e4 LT |
861 | memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); |
862 | b->secs = htons(jiffies_diff / HZ); | |
863 | b->xid = d->xid; | |
864 | ||
865 | /* add DHCP options or BOOTP extensions */ | |
866 | #ifdef IPCONFIG_DHCP | |
867 | if (ic_proto_enabled & IC_USE_DHCP) | |
22fc5388 | 868 | ic_dhcp_init_options(b->exten, d); |
1da177e4 LT |
869 | else |
870 | #endif | |
871 | ic_bootp_init_ext(b->exten); | |
872 | ||
873 | /* Chain packet down the line... */ | |
874 | skb->dev = dev; | |
875 | skb->protocol = htons(ETH_P_IP); | |
0c4e8581 | 876 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), |
ad79eefc RL |
877 | dev->broadcast, dev->dev_addr, skb->len) < 0) { |
878 | kfree_skb(skb); | |
879 | printk("E"); | |
880 | return; | |
881 | } | |
882 | ||
883 | if (dev_queue_xmit(skb) < 0) | |
1da177e4 LT |
884 | printk("E"); |
885 | } | |
886 | ||
887 | ||
888 | /* | |
b508d5fb | 889 | * Copy BOOTP-supplied string |
1da177e4 LT |
890 | */ |
891 | static int __init ic_bootp_string(char *dest, char *src, int len, int max) | |
892 | { | |
893 | if (!len) | |
894 | return 0; | |
895 | if (len > max-1) | |
896 | len = max-1; | |
897 | memcpy(dest, src, len); | |
898 | dest[len] = '\0'; | |
899 | return 1; | |
900 | } | |
901 | ||
902 | ||
903 | /* | |
904 | * Process BOOTP extensions. | |
905 | */ | |
906 | static void __init ic_do_bootp_ext(u8 *ext) | |
907 | { | |
747465ef ED |
908 | u8 servers; |
909 | int i; | |
910 | __be16 mtu; | |
1da177e4 | 911 | |
1da177e4 LT |
912 | u8 *c; |
913 | ||
09605cc1 | 914 | pr_debug("DHCP/BOOTP: Got extension %d:", *ext); |
132adf54 | 915 | for (c=ext+2; c<ext+2+ext[1]; c++) |
09605cc1 BS |
916 | pr_debug(" %02x", *c); |
917 | pr_debug("\n"); | |
1da177e4 LT |
918 | |
919 | switch (*ext++) { | |
1d67a516 JP |
920 | case 1: /* Subnet mask */ |
921 | if (ic_netmask == NONE) | |
922 | memcpy(&ic_netmask, ext+1, 4); | |
923 | break; | |
924 | case 3: /* Default gateway */ | |
925 | if (ic_gateway == NONE) | |
926 | memcpy(&ic_gateway, ext+1, 4); | |
927 | break; | |
928 | case 6: /* DNS server */ | |
929 | servers= *ext/4; | |
930 | if (servers > CONF_NAMESERVERS_MAX) | |
931 | servers = CONF_NAMESERVERS_MAX; | |
932 | for (i = 0; i < servers; i++) { | |
933 | if (ic_nameservers[i] == NONE) | |
934 | memcpy(&ic_nameservers[i], ext+1+4*i, 4); | |
935 | } | |
936 | break; | |
937 | case 12: /* Host name */ | |
b508d5fb JT |
938 | if (!ic_host_name_set) { |
939 | ic_bootp_string(utsname()->nodename, ext+1, *ext, | |
940 | __NEW_UTS_LEN); | |
941 | ic_host_name_set = 1; | |
942 | } | |
1d67a516 JP |
943 | break; |
944 | case 15: /* Domain name (DNS) */ | |
b508d5fb JT |
945 | if (!ic_domain[0]) |
946 | ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); | |
1d67a516 JP |
947 | break; |
948 | case 17: /* Root path */ | |
949 | if (!root_server_path[0]) | |
950 | ic_bootp_string(root_server_path, ext+1, *ext, | |
951 | sizeof(root_server_path)); | |
952 | break; | |
953 | case 26: /* Interface MTU */ | |
954 | memcpy(&mtu, ext+1, sizeof(mtu)); | |
955 | ic_dev_mtu = ntohs(mtu); | |
956 | break; | |
957 | case 40: /* NIS Domain name (_not_ DNS) */ | |
958 | ic_bootp_string(utsname()->domainname, ext+1, *ext, | |
959 | __NEW_UTS_LEN); | |
960 | break; | |
c04d2cb2 CN |
961 | case 42: /* NTP servers */ |
962 | servers = *ext / 4; | |
963 | if (servers > CONF_NTP_SERVERS_MAX) | |
964 | servers = CONF_NTP_SERVERS_MAX; | |
965 | for (i = 0; i < servers; i++) { | |
966 | if (ic_ntp_servers[i] == NONE) | |
967 | memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); | |
968 | } | |
969 | break; | |
1da177e4 LT |
970 | } |
971 | } | |
972 | ||
973 | ||
974 | /* | |
975 | * Receive BOOTP reply. | |
976 | */ | |
f2ccd8fa | 977 | static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
978 | { |
979 | struct bootp_pkt *b; | |
980 | struct iphdr *h; | |
981 | struct ic_device *d; | |
982 | int len, ext_len; | |
983 | ||
721499e8 | 984 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
985 | goto drop; |
986 | ||
1da177e4 LT |
987 | /* Perform verifications before taking the lock. */ |
988 | if (skb->pkt_type == PACKET_OTHERHOST) | |
989 | goto drop; | |
990 | ||
51456b29 IM |
991 | skb = skb_share_check(skb, GFP_ATOMIC); |
992 | if (!skb) | |
1da177e4 LT |
993 | return NET_RX_DROP; |
994 | ||
995 | if (!pskb_may_pull(skb, | |
996 | sizeof(struct iphdr) + | |
997 | sizeof(struct udphdr))) | |
998 | goto drop; | |
999 | ||
eddc9ec5 | 1000 | b = (struct bootp_pkt *)skb_network_header(skb); |
1da177e4 LT |
1001 | h = &b->iph; |
1002 | ||
1003 | if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) | |
1004 | goto drop; | |
1005 | ||
1006 | /* Fragments are not supported */ | |
56f8a75c | 1007 | if (ip_is_fragment(h)) { |
e87cc472 | 1008 | net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); |
1da177e4 LT |
1009 | goto drop; |
1010 | } | |
1011 | ||
1012 | if (skb->len < ntohs(h->tot_len)) | |
1013 | goto drop; | |
1014 | ||
1015 | if (ip_fast_csum((char *) h, h->ihl)) | |
1016 | goto drop; | |
1017 | ||
1018 | if (b->udph.source != htons(67) || b->udph.dest != htons(68)) | |
1019 | goto drop; | |
1020 | ||
1021 | if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) | |
1022 | goto drop; | |
1023 | ||
1024 | len = ntohs(b->udph.len) - sizeof(struct udphdr); | |
1025 | ext_len = len - (sizeof(*b) - | |
1026 | sizeof(struct iphdr) - | |
1027 | sizeof(struct udphdr) - | |
1028 | sizeof(b->exten)); | |
1029 | if (ext_len < 0) | |
1030 | goto drop; | |
1031 | ||
1032 | /* Ok the front looks good, make sure we can get at the rest. */ | |
1033 | if (!pskb_may_pull(skb, skb->len)) | |
1034 | goto drop; | |
1035 | ||
eddc9ec5 | 1036 | b = (struct bootp_pkt *)skb_network_header(skb); |
1da177e4 LT |
1037 | h = &b->iph; |
1038 | ||
1039 | /* One reply at a time, please. */ | |
1040 | spin_lock(&ic_recv_lock); | |
1041 | ||
1042 | /* If we already have a reply, just drop the packet */ | |
1043 | if (ic_got_reply) | |
1044 | goto drop_unlock; | |
1045 | ||
1046 | /* Find the ic_device that the packet arrived on */ | |
1047 | d = ic_first_dev; | |
1048 | while (d && d->dev != dev) | |
1049 | d = d->next; | |
1050 | if (!d) | |
1051 | goto drop_unlock; /* should never happen */ | |
1052 | ||
1053 | /* Is it a reply to our BOOTP request? */ | |
1054 | if (b->op != BOOTP_REPLY || | |
1055 | b->xid != d->xid) { | |
22fc5388 UKK |
1056 | net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", |
1057 | d->dev->name, b->op, b->xid); | |
1da177e4 LT |
1058 | goto drop_unlock; |
1059 | } | |
1060 | ||
1061 | /* Parse extensions */ | |
1062 | if (ext_len >= 4 && | |
1063 | !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ | |
e905a9ed | 1064 | u8 *end = (u8 *) b + ntohs(b->iph.tot_len); |
1da177e4 LT |
1065 | u8 *ext; |
1066 | ||
1067 | #ifdef IPCONFIG_DHCP | |
1068 | if (ic_proto_enabled & IC_USE_DHCP) { | |
5a874db4 | 1069 | __be32 server_id = NONE; |
1da177e4 LT |
1070 | int mt = 0; |
1071 | ||
1072 | ext = &b->exten[4]; | |
1073 | while (ext < end && *ext != 0xff) { | |
1074 | u8 *opt = ext++; | |
1075 | if (*opt == 0) /* Padding */ | |
1076 | continue; | |
1077 | ext += *ext + 1; | |
1078 | if (ext >= end) | |
1079 | break; | |
1080 | switch (*opt) { | |
1081 | case 53: /* Message type */ | |
1082 | if (opt[1]) | |
1083 | mt = opt[2]; | |
1084 | break; | |
1085 | case 54: /* Server ID (IP address) */ | |
1086 | if (opt[1] >= 4) | |
1087 | memcpy(&server_id, opt + 2, 4); | |
1088 | break; | |
3ff50b79 | 1089 | } |
1da177e4 LT |
1090 | } |
1091 | ||
22fc5388 | 1092 | pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); |
1da177e4 LT |
1093 | |
1094 | switch (mt) { | |
1095 | case DHCPOFFER: | |
1096 | /* While in the process of accepting one offer, | |
1097 | * ignore all others. | |
1098 | */ | |
5a874db4 | 1099 | if (ic_myaddr != NONE) |
1da177e4 LT |
1100 | goto drop_unlock; |
1101 | ||
1102 | /* Let's accept that offer. */ | |
1103 | ic_myaddr = b->your_ip; | |
1104 | ic_servaddr = server_id; | |
09605cc1 BS |
1105 | pr_debug("DHCP: Offered address %pI4 by server %pI4\n", |
1106 | &ic_myaddr, &b->iph.saddr); | |
1da177e4 LT |
1107 | /* The DHCP indicated server address takes |
1108 | * precedence over the bootp header one if | |
1109 | * they are different. | |
1110 | */ | |
5a874db4 | 1111 | if ((server_id != NONE) && |
1da177e4 LT |
1112 | (b->server_ip != server_id)) |
1113 | b->server_ip = ic_servaddr; | |
1114 | break; | |
1115 | ||
1116 | case DHCPACK: | |
1117 | if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) | |
1118 | goto drop_unlock; | |
1119 | ||
1120 | /* Yeah! */ | |
1121 | break; | |
1122 | ||
1123 | default: | |
1124 | /* Urque. Forget it*/ | |
5a874db4 AV |
1125 | ic_myaddr = NONE; |
1126 | ic_servaddr = NONE; | |
1da177e4 | 1127 | goto drop_unlock; |
3ff50b79 | 1128 | } |
1da177e4 LT |
1129 | |
1130 | ic_dhcp_msgtype = mt; | |
1131 | ||
1132 | } | |
1133 | #endif /* IPCONFIG_DHCP */ | |
1134 | ||
1135 | ext = &b->exten[4]; | |
1136 | while (ext < end && *ext != 0xff) { | |
1137 | u8 *opt = ext++; | |
1138 | if (*opt == 0) /* Padding */ | |
1139 | continue; | |
1140 | ext += *ext + 1; | |
1141 | if (ext < end) | |
1142 | ic_do_bootp_ext(opt); | |
1143 | } | |
1144 | } | |
1145 | ||
1146 | /* We have a winner! */ | |
2647cffb | 1147 | ic_dev = d; |
1da177e4 LT |
1148 | ic_myaddr = b->your_ip; |
1149 | ic_servaddr = b->server_ip; | |
9dd4a13a | 1150 | ic_addrservaddr = b->iph.saddr; |
5a874db4 | 1151 | if (ic_gateway == NONE && b->relay_ip) |
1da177e4 | 1152 | ic_gateway = b->relay_ip; |
5a874db4 | 1153 | if (ic_nameservers[0] == NONE) |
1da177e4 LT |
1154 | ic_nameservers[0] = ic_servaddr; |
1155 | ic_got_reply = IC_BOOTP; | |
1156 | ||
1157 | drop_unlock: | |
1158 | /* Show's over. Nothing to see here. */ | |
1159 | spin_unlock(&ic_recv_lock); | |
1160 | ||
1161 | drop: | |
1162 | /* Throw the packet out. */ | |
1163 | kfree_skb(skb); | |
1164 | ||
1165 | return 0; | |
e905a9ed | 1166 | } |
1da177e4 LT |
1167 | |
1168 | ||
1169 | #endif | |
1170 | ||
1171 | ||
1172 | /* | |
1173 | * Dynamic IP configuration -- DHCP, BOOTP, RARP. | |
1174 | */ | |
1175 | ||
1176 | #ifdef IPCONFIG_DYNAMIC | |
1177 | ||
1178 | static int __init ic_dynamic(void) | |
1179 | { | |
1180 | int retries; | |
1181 | struct ic_device *d; | |
1182 | unsigned long start_jiffies, timeout, jiff; | |
1183 | int do_bootp = ic_proto_have_if & IC_BOOTP; | |
1184 | int do_rarp = ic_proto_have_if & IC_RARP; | |
1185 | ||
1186 | /* | |
1187 | * If none of DHCP/BOOTP/RARP was selected, return with an error. | |
1188 | * This routine gets only called when some pieces of information | |
1189 | * are missing, and without DHCP/BOOTP/RARP we are unable to get it. | |
1190 | */ | |
1191 | if (!ic_proto_enabled) { | |
058bd4d2 | 1192 | pr_err("IP-Config: Incomplete network configuration information\n"); |
1da177e4 LT |
1193 | return -1; |
1194 | } | |
1195 | ||
1196 | #ifdef IPCONFIG_BOOTP | |
1197 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) | |
058bd4d2 | 1198 | pr_err("DHCP/BOOTP: No suitable device found\n"); |
1da177e4 LT |
1199 | #endif |
1200 | #ifdef IPCONFIG_RARP | |
1201 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) | |
058bd4d2 | 1202 | pr_err("RARP: No suitable device found\n"); |
1da177e4 LT |
1203 | #endif |
1204 | ||
1205 | if (!ic_proto_have_if) | |
1206 | /* Error message already printed */ | |
1207 | return -1; | |
1208 | ||
1209 | /* | |
1210 | * Setup protocols | |
1211 | */ | |
1212 | #ifdef IPCONFIG_BOOTP | |
1213 | if (do_bootp) | |
1214 | ic_bootp_init(); | |
1215 | #endif | |
1216 | #ifdef IPCONFIG_RARP | |
1217 | if (do_rarp) | |
1218 | ic_rarp_init(); | |
1219 | #endif | |
1220 | ||
1221 | /* | |
1222 | * Send requests and wait, until we get an answer. This loop | |
1223 | * seems to be a terrible waste of CPU time, but actually there is | |
1224 | * only one process running at all, so we don't need to use any | |
1225 | * scheduler functions. | |
e905a9ed | 1226 | * [Actually we could now, but the nothing else running note still |
1da177e4 LT |
1227 | * applies.. - AC] |
1228 | */ | |
058bd4d2 JP |
1229 | pr_notice("Sending %s%s%s requests .", |
1230 | do_bootp | |
1231 | ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", | |
1232 | (do_bootp && do_rarp) ? " and " : "", | |
1233 | do_rarp ? "RARP" : ""); | |
1da177e4 LT |
1234 | |
1235 | start_jiffies = jiffies; | |
1236 | d = ic_first_dev; | |
1237 | retries = CONF_SEND_RETRIES; | |
1238 | get_random_bytes(&timeout, sizeof(timeout)); | |
95c96174 | 1239 | timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); |
132adf54 | 1240 | for (;;) { |
405fd707 | 1241 | #ifdef IPCONFIG_BOOTP |
1da177e4 LT |
1242 | if (do_bootp && (d->able & IC_BOOTP)) |
1243 | ic_bootp_send_if(d, jiffies - start_jiffies); | |
1244 | #endif | |
1245 | #ifdef IPCONFIG_RARP | |
1246 | if (do_rarp && (d->able & IC_RARP)) | |
1247 | ic_rarp_send_if(d); | |
1248 | #endif | |
1249 | ||
e0688534 UKK |
1250 | if (!d->next) { |
1251 | jiff = jiffies + timeout; | |
1252 | while (time_before(jiffies, jiff) && !ic_got_reply) | |
1253 | schedule_timeout_uninterruptible(1); | |
1254 | } | |
1da177e4 LT |
1255 | #ifdef IPCONFIG_DHCP |
1256 | /* DHCP isn't done until we get a DHCPACK. */ | |
9d4fb27d JP |
1257 | if ((ic_got_reply & IC_BOOTP) && |
1258 | (ic_proto_enabled & IC_USE_DHCP) && | |
1259 | ic_dhcp_msgtype != DHCPACK) { | |
1da177e4 | 1260 | ic_got_reply = 0; |
2647cffb UKK |
1261 | /* continue on device that got the reply */ |
1262 | d = ic_dev; | |
6c1c36b0 | 1263 | pr_cont(","); |
1da177e4 LT |
1264 | continue; |
1265 | } | |
1266 | #endif /* IPCONFIG_DHCP */ | |
1267 | ||
1268 | if (ic_got_reply) { | |
6c1c36b0 | 1269 | pr_cont(" OK\n"); |
1da177e4 LT |
1270 | break; |
1271 | } | |
1272 | ||
1273 | if ((d = d->next)) | |
1274 | continue; | |
1275 | ||
1276 | if (! --retries) { | |
6c1c36b0 | 1277 | pr_cont(" timed out!\n"); |
1da177e4 LT |
1278 | break; |
1279 | } | |
1280 | ||
1281 | d = ic_first_dev; | |
1282 | ||
1283 | timeout = timeout CONF_TIMEOUT_MULT; | |
1284 | if (timeout > CONF_TIMEOUT_MAX) | |
1285 | timeout = CONF_TIMEOUT_MAX; | |
1286 | ||
6c1c36b0 | 1287 | pr_cont("."); |
1da177e4 LT |
1288 | } |
1289 | ||
1290 | #ifdef IPCONFIG_BOOTP | |
1291 | if (do_bootp) | |
1292 | ic_bootp_cleanup(); | |
1293 | #endif | |
1294 | #ifdef IPCONFIG_RARP | |
1295 | if (do_rarp) | |
1296 | ic_rarp_cleanup(); | |
1297 | #endif | |
1298 | ||
7a1af5d7 | 1299 | if (!ic_got_reply) { |
5a874db4 | 1300 | ic_myaddr = NONE; |
1da177e4 | 1301 | return -1; |
7a1af5d7 | 1302 | } |
1da177e4 | 1303 | |
6c1c36b0 | 1304 | pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", |
e905a9ed | 1305 | ((ic_got_reply & IC_RARP) ? "RARP" |
09605cc1 | 1306 | : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), |
6c1c36b0 | 1307 | &ic_addrservaddr, &ic_myaddr); |
1da177e4 LT |
1308 | |
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | #endif /* IPCONFIG_DYNAMIC */ | |
1313 | ||
1314 | #ifdef CONFIG_PROC_FS | |
289e1f4e AR |
1315 | /* proc_dir_entry for /proc/net/ipconfig */ |
1316 | static struct proc_dir_entry *ipconfig_dir; | |
1da177e4 | 1317 | |
c04d2cb2 | 1318 | /* Name servers: */ |
1da177e4 LT |
1319 | static int pnp_seq_show(struct seq_file *seq, void *v) |
1320 | { | |
1321 | int i; | |
1322 | ||
1323 | if (ic_proto_used & IC_PROTO) | |
1324 | seq_printf(seq, "#PROTO: %s\n", | |
1325 | (ic_proto_used & IC_RARP) ? "RARP" | |
1326 | : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); | |
1327 | else | |
1328 | seq_puts(seq, "#MANUAL\n"); | |
1329 | ||
1330 | if (ic_domain[0]) | |
1331 | seq_printf(seq, | |
1332 | "domain %s\n", ic_domain); | |
1333 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { | |
5a874db4 | 1334 | if (ic_nameservers[i] != NONE) |
673d57e7 HH |
1335 | seq_printf(seq, "nameserver %pI4\n", |
1336 | &ic_nameservers[i]); | |
1da177e4 | 1337 | } |
5a874db4 | 1338 | if (ic_servaddr != NONE) |
673d57e7 HH |
1339 | seq_printf(seq, "bootserver %pI4\n", |
1340 | &ic_servaddr); | |
1da177e4 LT |
1341 | return 0; |
1342 | } | |
1343 | ||
4d019b3f | 1344 | /* Create the /proc/net/ipconfig directory */ |
c04d2cb2 | 1345 | static int __init ipconfig_proc_net_init(void) |
4d019b3f CN |
1346 | { |
1347 | ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net); | |
1348 | if (!ipconfig_dir) | |
1349 | return -ENOMEM; | |
1350 | ||
1351 | return 0; | |
1352 | } | |
c04d2cb2 CN |
1353 | |
1354 | /* Create a new file under /proc/net/ipconfig */ | |
1355 | static int ipconfig_proc_net_create(const char *name, | |
97a32539 | 1356 | const struct proc_ops *proc_ops) |
c04d2cb2 CN |
1357 | { |
1358 | char *pname; | |
1359 | struct proc_dir_entry *p; | |
1360 | ||
1361 | if (!ipconfig_dir) | |
1362 | return -ENOMEM; | |
1363 | ||
1364 | pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name); | |
1365 | if (!pname) | |
1366 | return -ENOMEM; | |
1367 | ||
97a32539 | 1368 | p = proc_create(pname, 0444, init_net.proc_net, proc_ops); |
c04d2cb2 CN |
1369 | kfree(pname); |
1370 | if (!p) | |
1371 | return -ENOMEM; | |
1372 | ||
1373 | return 0; | |
1374 | } | |
1375 | ||
1376 | /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ | |
97a32539 | 1377 | static int ntp_servers_show(struct seq_file *seq, void *v) |
c04d2cb2 CN |
1378 | { |
1379 | int i; | |
1380 | ||
1381 | for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { | |
1382 | if (ic_ntp_servers[i] != NONE) | |
1383 | seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]); | |
1384 | } | |
1385 | return 0; | |
1386 | } | |
97a32539 | 1387 | DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers); |
1da177e4 LT |
1388 | #endif /* CONFIG_PROC_FS */ |
1389 | ||
1390 | /* | |
1391 | * Extract IP address from the parameter string if needed. Note that we | |
1392 | * need to have root_server_addr set _before_ IPConfig gets called as it | |
1393 | * can override it. | |
1394 | */ | |
5a874db4 | 1395 | __be32 __init root_nfs_parse_addr(char *name) |
1da177e4 | 1396 | { |
5a874db4 | 1397 | __be32 addr; |
1da177e4 LT |
1398 | int octets = 0; |
1399 | char *cp, *cq; | |
1400 | ||
1401 | cp = cq = name; | |
1402 | while (octets < 4) { | |
1403 | while (*cp >= '0' && *cp <= '9') | |
1404 | cp++; | |
1405 | if (cp == cq || cp - cq > 3) | |
1406 | break; | |
1407 | if (*cp == '.' || octets == 3) | |
1408 | octets++; | |
1409 | if (octets < 4) | |
1410 | cp++; | |
1411 | cq = cp; | |
1412 | } | |
1413 | if (octets == 4 && (*cp == ':' || *cp == '\0')) { | |
1414 | if (*cp == ':') | |
1415 | *cp++ = '\0'; | |
1416 | addr = in_aton(name); | |
1417 | memmove(name, cp, strlen(cp) + 1); | |
1418 | } else | |
5a874db4 | 1419 | addr = NONE; |
1da177e4 LT |
1420 | |
1421 | return addr; | |
1422 | } | |
1423 | ||
964ad81c DM |
1424 | #define DEVICE_WAIT_MAX 12 /* 12 seconds */ |
1425 | ||
1426 | static int __init wait_for_devices(void) | |
1427 | { | |
1428 | int i; | |
1429 | ||
964ad81c DM |
1430 | for (i = 0; i < DEVICE_WAIT_MAX; i++) { |
1431 | struct net_device *dev; | |
1432 | int found = 0; | |
1433 | ||
e2ffe3ff TB |
1434 | /* make sure deferred device probes are finished */ |
1435 | wait_for_device_probe(); | |
1436 | ||
964ad81c DM |
1437 | rtnl_lock(); |
1438 | for_each_netdev(&init_net, dev) { | |
3fb72f1e | 1439 | if (ic_is_init_dev(dev)) { |
964ad81c DM |
1440 | found = 1; |
1441 | break; | |
1442 | } | |
1443 | } | |
1444 | rtnl_unlock(); | |
1445 | if (found) | |
1446 | return 0; | |
1447 | ssleep(1); | |
1448 | } | |
1449 | return -ENODEV; | |
1450 | } | |
1451 | ||
1da177e4 LT |
1452 | /* |
1453 | * IP Autoconfig dispatcher. | |
1454 | */ | |
1455 | ||
1456 | static int __init ip_auto_config(void) | |
1457 | { | |
5a874db4 | 1458 | __be32 addr; |
9d8dba6c BZ |
1459 | #ifdef IPCONFIG_DYNAMIC |
1460 | int retries = CONF_OPEN_RETRIES; | |
1461 | #endif | |
964ad81c | 1462 | int err; |
c9f64d1f | 1463 | unsigned int i, count; |
1da177e4 | 1464 | |
c04d2cb2 CN |
1465 | /* Initialise all name servers and NTP servers to NONE (but only if the |
1466 | * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, | |
1467 | * otherwise we'll overwrite the IP addresses specified there) | |
300eec7c | 1468 | */ |
c04d2cb2 | 1469 | if (ic_set_manually == 0) { |
300eec7c | 1470 | ic_nameservers_predef(); |
c04d2cb2 CN |
1471 | ic_ntp_servers_predef(); |
1472 | } | |
300eec7c | 1473 | |
1da177e4 | 1474 | #ifdef CONFIG_PROC_FS |
3f3942ac | 1475 | proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show); |
4d019b3f | 1476 | |
c04d2cb2 | 1477 | if (ipconfig_proc_net_init() == 0) |
97a32539 | 1478 | ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops); |
1da177e4 LT |
1479 | #endif /* CONFIG_PROC_FS */ |
1480 | ||
1481 | if (!ic_enable) | |
1482 | return 0; | |
1483 | ||
09605cc1 | 1484 | pr_debug("IP-Config: Entered.\n"); |
1da177e4 LT |
1485 | #ifdef IPCONFIG_DYNAMIC |
1486 | try_try_again: | |
1487 | #endif | |
964ad81c DM |
1488 | /* Wait for devices to appear */ |
1489 | err = wait_for_devices(); | |
1490 | if (err) | |
1491 | return err; | |
1da177e4 LT |
1492 | |
1493 | /* Setup all network devices */ | |
964ad81c DM |
1494 | err = ic_open_devs(); |
1495 | if (err) | |
1496 | return err; | |
1da177e4 LT |
1497 | |
1498 | /* Give drivers a chance to settle */ | |
3fb72f1e | 1499 | msleep(CONF_POST_OPEN); |
1da177e4 LT |
1500 | |
1501 | /* | |
1502 | * If the config information is insufficient (e.g., our IP address or | |
1503 | * IP address of the boot server is missing or we have multiple network | |
1504 | * interfaces and no default was set), use BOOTP or RARP to get the | |
1505 | * missing values. | |
1506 | */ | |
5a874db4 | 1507 | if (ic_myaddr == NONE || |
51976f47 | 1508 | #if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT) |
9d4fb27d JP |
1509 | (root_server_addr == NONE && |
1510 | ic_servaddr == NONE && | |
51976f47 | 1511 | (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) || |
1da177e4 LT |
1512 | #endif |
1513 | ic_first_dev->next) { | |
1514 | #ifdef IPCONFIG_DYNAMIC | |
1da177e4 LT |
1515 | if (ic_dynamic() < 0) { |
1516 | ic_close_devs(); | |
1517 | ||
1518 | /* | |
1519 | * I don't know why, but sometimes the | |
1520 | * eepro100 driver (at least) gets upset and | |
1521 | * doesn't work the first time it's opened. | |
1522 | * But then if you close it and reopen it, it | |
1523 | * works just fine. So we need to try that at | |
1524 | * least once before giving up. | |
1525 | * | |
1526 | * Also, if the root will be NFS-mounted, we | |
1527 | * have nowhere to go if DHCP fails. So we | |
1528 | * just have to keep trying forever. | |
1529 | * | |
1530 | * -- Chip | |
1531 | */ | |
1532 | #ifdef CONFIG_ROOT_NFS | |
1533 | if (ROOT_DEV == Root_NFS) { | |
058bd4d2 | 1534 | pr_err("IP-Config: Retrying forever (NFS root)...\n"); |
1da177e4 LT |
1535 | goto try_try_again; |
1536 | } | |
1537 | #endif | |
51976f47 PAS |
1538 | #ifdef CONFIG_CIFS_ROOT |
1539 | if (ROOT_DEV == Root_CIFS) { | |
1540 | pr_err("IP-Config: Retrying forever (CIFS root)...\n"); | |
1541 | goto try_try_again; | |
1542 | } | |
1543 | #endif | |
1da177e4 LT |
1544 | |
1545 | if (--retries) { | |
058bd4d2 | 1546 | pr_err("IP-Config: Reopening network devices...\n"); |
1da177e4 LT |
1547 | goto try_try_again; |
1548 | } | |
1549 | ||
1550 | /* Oh, well. At least we tried. */ | |
058bd4d2 | 1551 | pr_err("IP-Config: Auto-configuration of network failed\n"); |
1da177e4 LT |
1552 | return -1; |
1553 | } | |
1554 | #else /* !DYNAMIC */ | |
058bd4d2 | 1555 | pr_err("IP-Config: Incomplete network configuration information\n"); |
1da177e4 LT |
1556 | ic_close_devs(); |
1557 | return -1; | |
1558 | #endif /* IPCONFIG_DYNAMIC */ | |
1559 | } else { | |
1560 | /* Device selected manually or only one device -> use it */ | |
2647cffb | 1561 | ic_dev = ic_first_dev; |
1da177e4 LT |
1562 | } |
1563 | ||
1564 | addr = root_nfs_parse_addr(root_server_path); | |
5a874db4 | 1565 | if (root_server_addr == NONE) |
1da177e4 LT |
1566 | root_server_addr = addr; |
1567 | ||
1568 | /* | |
25985edc | 1569 | * Use defaults wherever applicable. |
1da177e4 LT |
1570 | */ |
1571 | if (ic_defaults() < 0) | |
1572 | return -1; | |
1573 | ||
1da177e4 LT |
1574 | /* |
1575 | * Record which protocol was actually used. | |
1576 | */ | |
1577 | #ifdef IPCONFIG_DYNAMIC | |
1578 | ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); | |
1579 | #endif | |
1580 | ||
1581 | #ifndef IPCONFIG_SILENT | |
1582 | /* | |
1583 | * Clue in the operator. | |
1584 | */ | |
058bd4d2 | 1585 | pr_info("IP-Config: Complete:\n"); |
9ecd1c3d CF |
1586 | |
1587 | pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", | |
2647cffb | 1588 | ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, |
9ecd1c3d | 1589 | &ic_myaddr, &ic_netmask, &ic_gateway); |
058bd4d2 JP |
1590 | pr_info(" host=%s, domain=%s, nis-domain=%s\n", |
1591 | utsname()->nodename, ic_domain, utsname()->domainname); | |
1592 | pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", | |
1593 | &ic_servaddr, &root_server_addr, root_server_path); | |
9643f455 | 1594 | if (ic_dev_mtu) |
058bd4d2 | 1595 | pr_cont(", mtu=%d", ic_dev_mtu); |
e18bdc83 | 1596 | /* Name servers (if any): */ |
c9f64d1f | 1597 | for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) { |
5e953778 | 1598 | if (ic_nameservers[i] != NONE) { |
e18bdc83 CN |
1599 | if (i == 0) |
1600 | pr_info(" nameserver%u=%pI4", | |
1601 | i, &ic_nameservers[i]); | |
1602 | else | |
1603 | pr_cont(", nameserver%u=%pI4", | |
1604 | i, &ic_nameservers[i]); | |
c9f64d1f TR |
1605 | |
1606 | count++; | |
5e953778 | 1607 | } |
c9f64d1f | 1608 | if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0) |
e18bdc83 CN |
1609 | pr_cont("\n"); |
1610 | } | |
c04d2cb2 | 1611 | /* NTP servers (if any): */ |
c9f64d1f | 1612 | for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) { |
c04d2cb2 CN |
1613 | if (ic_ntp_servers[i] != NONE) { |
1614 | if (i == 0) | |
1615 | pr_info(" ntpserver%u=%pI4", | |
1616 | i, &ic_ntp_servers[i]); | |
1617 | else | |
1618 | pr_cont(", ntpserver%u=%pI4", | |
1619 | i, &ic_ntp_servers[i]); | |
c9f64d1f TR |
1620 | |
1621 | count++; | |
c04d2cb2 | 1622 | } |
c9f64d1f | 1623 | if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0) |
c04d2cb2 CN |
1624 | pr_cont("\n"); |
1625 | } | |
1da177e4 LT |
1626 | #endif /* !SILENT */ |
1627 | ||
9c706a49 UKK |
1628 | /* |
1629 | * Close all network devices except the device we've | |
1630 | * autoconfigured and set up routes. | |
1631 | */ | |
9c706a49 | 1632 | if (ic_setup_if() < 0 || ic_setup_routes() < 0) |
d2d371ae TR |
1633 | err = -1; |
1634 | else | |
1635 | err = 0; | |
9c706a49 | 1636 | |
d2d371ae | 1637 | ic_close_devs(); |
9c706a49 | 1638 | |
d2d371ae | 1639 | return err; |
1da177e4 LT |
1640 | } |
1641 | ||
1642 | late_initcall(ip_auto_config); | |
1643 | ||
1644 | ||
1645 | /* | |
1646 | * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel | |
3eb30c51 | 1647 | * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst. |
1da177e4 LT |
1648 | */ |
1649 | static int __init ic_proto_name(char *name) | |
1650 | { | |
1651 | if (!strcmp(name, "on") || !strcmp(name, "any")) { | |
1652 | return 1; | |
1653 | } | |
a6c05c3d | 1654 | if (!strcmp(name, "off") || !strcmp(name, "none")) { |
92ffb85d | 1655 | return 0; |
a6c05c3d | 1656 | } |
1da177e4 | 1657 | #ifdef CONFIG_IP_PNP_DHCP |
26fb342c LR |
1658 | else if (!strncmp(name, "dhcp", 4)) { |
1659 | char *client_id; | |
1660 | ||
1da177e4 | 1661 | ic_proto_enabled &= ~IC_RARP; |
26fb342c LR |
1662 | client_id = strstr(name, "dhcp,"); |
1663 | if (client_id) { | |
1664 | char *v; | |
1665 | ||
1666 | client_id = client_id + 5; | |
1667 | v = strchr(client_id, ','); | |
1668 | if (!v) | |
1669 | return 1; | |
1670 | *v = 0; | |
1671 | if (kstrtou8(client_id, 0, dhcp_client_identifier)) | |
09605cc1 | 1672 | pr_debug("DHCP: Invalid client identifier type\n"); |
26fb342c LR |
1673 | strncpy(dhcp_client_identifier + 1, v + 1, 251); |
1674 | *v = ','; | |
1675 | } | |
1da177e4 LT |
1676 | return 1; |
1677 | } | |
1678 | #endif | |
1679 | #ifdef CONFIG_IP_PNP_BOOTP | |
1680 | else if (!strcmp(name, "bootp")) { | |
1681 | ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); | |
1682 | return 1; | |
1683 | } | |
1684 | #endif | |
1685 | #ifdef CONFIG_IP_PNP_RARP | |
1686 | else if (!strcmp(name, "rarp")) { | |
1687 | ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); | |
1688 | return 1; | |
1689 | } | |
1690 | #endif | |
1691 | #ifdef IPCONFIG_DYNAMIC | |
1692 | else if (!strcmp(name, "both")) { | |
1693 | ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ | |
1694 | return 1; | |
1695 | } | |
1696 | #endif | |
1697 | return 0; | |
1698 | } | |
1699 | ||
1700 | static int __init ip_auto_config_setup(char *addrs) | |
1701 | { | |
1702 | char *cp, *ip, *dp; | |
1703 | int num = 0; | |
1704 | ||
1705 | ic_set_manually = 1; | |
9cecd07c | 1706 | ic_enable = 1; |
1da177e4 | 1707 | |
92ffb85d AW |
1708 | /* |
1709 | * If any dhcp, bootp etc options are set, leave autoconfig on | |
1710 | * and skip the below static IP processing. | |
1711 | */ | |
1da177e4 LT |
1712 | if (ic_proto_name(addrs)) |
1713 | return 1; | |
1714 | ||
92ffb85d AW |
1715 | /* If no static IP is given, turn off autoconfig and bail. */ |
1716 | if (*addrs == 0 || | |
1717 | strcmp(addrs, "off") == 0 || | |
1718 | strcmp(addrs, "none") == 0) { | |
1719 | ic_enable = 0; | |
1720 | return 1; | |
1721 | } | |
1722 | ||
c04d2cb2 | 1723 | /* Initialise all name servers and NTP servers to NONE */ |
5e953778 | 1724 | ic_nameservers_predef(); |
c04d2cb2 | 1725 | ic_ntp_servers_predef(); |
5e953778 | 1726 | |
92ffb85d | 1727 | /* Parse string for static IP assignment. */ |
1da177e4 LT |
1728 | ip = addrs; |
1729 | while (ip && *ip) { | |
1730 | if ((cp = strchr(ip, ':'))) | |
1731 | *cp++ = '\0'; | |
1732 | if (strlen(ip) > 0) { | |
09605cc1 | 1733 | pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); |
1da177e4 LT |
1734 | switch (num) { |
1735 | case 0: | |
e6f1cebf | 1736 | if ((ic_myaddr = in_aton(ip)) == ANY) |
5a874db4 | 1737 | ic_myaddr = NONE; |
1da177e4 LT |
1738 | break; |
1739 | case 1: | |
e6f1cebf | 1740 | if ((ic_servaddr = in_aton(ip)) == ANY) |
5a874db4 | 1741 | ic_servaddr = NONE; |
1da177e4 LT |
1742 | break; |
1743 | case 2: | |
e6f1cebf | 1744 | if ((ic_gateway = in_aton(ip)) == ANY) |
5a874db4 | 1745 | ic_gateway = NONE; |
1da177e4 LT |
1746 | break; |
1747 | case 3: | |
e6f1cebf | 1748 | if ((ic_netmask = in_aton(ip)) == ANY) |
5a874db4 | 1749 | ic_netmask = NONE; |
1da177e4 LT |
1750 | break; |
1751 | case 4: | |
1752 | if ((dp = strchr(ip, '.'))) { | |
1753 | *dp++ = '\0'; | |
e9ff3990 SH |
1754 | strlcpy(utsname()->domainname, dp, |
1755 | sizeof(utsname()->domainname)); | |
1da177e4 | 1756 | } |
e9ff3990 SH |
1757 | strlcpy(utsname()->nodename, ip, |
1758 | sizeof(utsname()->nodename)); | |
1da177e4 LT |
1759 | ic_host_name_set = 1; |
1760 | break; | |
1761 | case 5: | |
1762 | strlcpy(user_dev_name, ip, sizeof(user_dev_name)); | |
1763 | break; | |
1764 | case 6: | |
92ffb85d AW |
1765 | if (ic_proto_name(ip) == 0 && |
1766 | ic_myaddr == NONE) { | |
1767 | ic_enable = 0; | |
1768 | } | |
1da177e4 | 1769 | break; |
5e953778 CF |
1770 | case 7: |
1771 | if (CONF_NAMESERVERS_MAX >= 1) { | |
1772 | ic_nameservers[0] = in_aton(ip); | |
1773 | if (ic_nameservers[0] == ANY) | |
1774 | ic_nameservers[0] = NONE; | |
1775 | } | |
1776 | break; | |
1777 | case 8: | |
1778 | if (CONF_NAMESERVERS_MAX >= 2) { | |
1779 | ic_nameservers[1] = in_aton(ip); | |
1780 | if (ic_nameservers[1] == ANY) | |
1781 | ic_nameservers[1] = NONE; | |
1782 | } | |
1783 | break; | |
c04d2cb2 CN |
1784 | case 9: |
1785 | if (CONF_NTP_SERVERS_MAX >= 1) { | |
1786 | ic_ntp_servers[0] = in_aton(ip); | |
1787 | if (ic_ntp_servers[0] == ANY) | |
1788 | ic_ntp_servers[0] = NONE; | |
1789 | } | |
1790 | break; | |
1da177e4 LT |
1791 | } |
1792 | } | |
1793 | ip = cp; | |
1794 | num++; | |
1795 | } | |
1796 | ||
1797 | return 1; | |
1798 | } | |
b37f4d7b | 1799 | __setup("ip=", ip_auto_config_setup); |
1da177e4 LT |
1800 | |
1801 | static int __init nfsaddrs_config_setup(char *addrs) | |
1802 | { | |
1803 | return ip_auto_config_setup(addrs); | |
1804 | } | |
b37f4d7b | 1805 | __setup("nfsaddrs=", nfsaddrs_config_setup); |
1da177e4 | 1806 | |
62013dbb RJ |
1807 | static int __init vendor_class_identifier_setup(char *addrs) |
1808 | { | |
1809 | if (strlcpy(vendor_class_identifier, addrs, | |
1810 | sizeof(vendor_class_identifier)) | |
1811 | >= sizeof(vendor_class_identifier)) | |
09605cc1 | 1812 | pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", |
058bd4d2 | 1813 | vendor_class_identifier); |
62013dbb RJ |
1814 | return 1; |
1815 | } | |
62013dbb | 1816 | __setup("dhcpclass=", vendor_class_identifier_setup); |
3fc46fc9 MK |
1817 | |
1818 | static int __init set_carrier_timeout(char *str) | |
1819 | { | |
1820 | ssize_t ret; | |
1821 | ||
1822 | if (!str) | |
1823 | return 0; | |
1824 | ||
1825 | ret = kstrtouint(str, 0, &carrier_timeout); | |
1826 | if (ret) | |
1827 | return 0; | |
1828 | ||
1829 | return 1; | |
1830 | } | |
1831 | __setup("carrier_timeout=", set_carrier_timeout); |