Commit | Line | Data |
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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 | } | |
ee046d9a MC |
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(); | |
3fb72f1e | 270 | |
cd7816d1 GF |
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 | ||
3fb72f1e MN |
275 | /* wait for a carrier on at least one device */ |
276 | start = jiffies; | |
3fc46fc9 | 277 | next_msg = start + msecs_to_jiffies(20000); |
c72c95a0 | 278 | while (time_before(jiffies, start + |
3fc46fc9 | 279 | msecs_to_jiffies(carrier_timeout * 1000))) { |
5e404cd6 PG |
280 | int wait, elapsed; |
281 | ||
ee046d9a | 282 | rtnl_lock(); |
3fb72f1e | 283 | for_each_netdev(&init_net, dev) |
ee046d9a MC |
284 | if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) { |
285 | rtnl_unlock(); | |
3fb72f1e | 286 | goto have_carrier; |
ee046d9a MC |
287 | } |
288 | rtnl_unlock(); | |
3fb72f1e MN |
289 | |
290 | msleep(1); | |
5e404cd6 | 291 | |
357137a4 | 292 | if (time_before(jiffies, next_msg)) |
5e404cd6 PG |
293 | continue; |
294 | ||
295 | elapsed = jiffies_to_msecs(jiffies - start); | |
3fc46fc9 | 296 | wait = (carrier_timeout * 1000 - elapsed + 500) / 1000; |
5e404cd6 | 297 | pr_info("Waiting up to %d more seconds for network.\n", wait); |
3fc46fc9 | 298 | next_msg = jiffies + msecs_to_jiffies(20000); |
3fb72f1e MN |
299 | } |
300 | have_carrier: | |
1da177e4 LT |
301 | |
302 | *last = NULL; | |
303 | ||
304 | if (!ic_first_dev) { | |
305 | if (user_dev_name[0]) | |
058bd4d2 JP |
306 | pr_err("IP-Config: Device `%s' not found\n", |
307 | user_dev_name); | |
1da177e4 | 308 | else |
058bd4d2 | 309 | pr_err("IP-Config: No network devices available\n"); |
964ad81c | 310 | return -ENODEV; |
1da177e4 LT |
311 | } |
312 | return 0; | |
313 | } | |
314 | ||
46acf7bd VO |
315 | /* Close all network interfaces except the one we've autoconfigured, and its |
316 | * lowers, in case it's a stacked virtual interface. | |
317 | */ | |
1da177e4 LT |
318 | static void __init ic_close_devs(void) |
319 | { | |
a50a151e | 320 | struct net_device *selected_dev = ic_dev ? ic_dev->dev : NULL; |
1da177e4 LT |
321 | struct ic_device *d, *next; |
322 | struct net_device *dev; | |
323 | ||
6756ae4b | 324 | rtnl_lock(); |
1da177e4 LT |
325 | next = ic_first_dev; |
326 | while ((d = next)) { | |
46acf7bd | 327 | bool bring_down = (d != ic_dev); |
a50a151e | 328 | struct net_device *lower; |
46acf7bd VO |
329 | struct list_head *iter; |
330 | ||
1da177e4 LT |
331 | next = d->next; |
332 | dev = d->dev; | |
46acf7bd | 333 | |
a50a151e VO |
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 | } | |
46acf7bd VO |
340 | } |
341 | } | |
342 | if (bring_down) { | |
09605cc1 | 343 | pr_debug("IP-Config: Downing %s\n", dev->name); |
567c5e13 | 344 | dev_change_flags(dev, d->flags, NULL); |
1da177e4 LT |
345 | } |
346 | kfree(d); | |
347 | } | |
6756ae4b | 348 | rtnl_unlock(); |
1da177e4 LT |
349 | } |
350 | ||
351 | /* | |
352 | * Interface to various network functions. | |
353 | */ | |
354 | ||
355 | static inline void | |
5a874db4 | 356 | set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) |
1da177e4 LT |
357 | { |
358 | sin->sin_family = AF_INET; | |
359 | sin->sin_addr.s_addr = addr; | |
360 | sin->sin_port = port; | |
361 | } | |
362 | ||
1da177e4 LT |
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)); | |
2647cffb | 374 | strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); |
1da177e4 | 375 | set_sockaddr(sin, ic_myaddr, 0); |
03aef17b | 376 | if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) { |
058bd4d2 JP |
377 | pr_err("IP-Config: Unable to set interface address (%d)\n", |
378 | err); | |
1da177e4 LT |
379 | return -1; |
380 | } | |
381 | set_sockaddr(sin, ic_netmask, 0); | |
03aef17b | 382 | if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) { |
058bd4d2 JP |
383 | pr_err("IP-Config: Unable to set interface netmask (%d)\n", |
384 | err); | |
1da177e4 LT |
385 | return -1; |
386 | } | |
387 | set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); | |
03aef17b | 388 | if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) { |
058bd4d2 JP |
389 | pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", |
390 | err); | |
1da177e4 LT |
391 | return -1; |
392 | } | |
9643f455 CF |
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) { | |
6a88fbe7 AV |
398 | rtnl_lock(); |
399 | if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) | |
058bd4d2 JP |
400 | pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", |
401 | ic_dev_mtu, err); | |
6a88fbe7 | 402 | rtnl_unlock(); |
9643f455 | 403 | } |
1da177e4 LT |
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 | ||
5a874db4 | 411 | if (ic_gateway != NONE) { |
1da177e4 LT |
412 | struct rtentry rm; |
413 | int err; | |
414 | ||
415 | memset(&rm, 0, sizeof(rm)); | |
416 | if ((ic_gateway ^ ic_myaddr) & ic_netmask) { | |
058bd4d2 | 417 | pr_err("IP-Config: Gateway not on directly connected network\n"); |
1da177e4 LT |
418 | return -1; |
419 | } | |
420 | set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); | |
421 | set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); | |
422 | set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); | |
423 | rm.rt_flags = RTF_UP | RTF_GATEWAY; | |
ca25c300 | 424 | if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { |
058bd4d2 JP |
425 | pr_err("IP-Config: Cannot add default route (%d)\n", |
426 | err); | |
1da177e4 LT |
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 | */ | |
e905a9ed | 444 | |
1da177e4 | 445 | if (!ic_host_name_set) |
673d57e7 | 446 | sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); |
1da177e4 | 447 | |
5a874db4 | 448 | if (root_server_addr == NONE) |
1da177e4 LT |
449 | root_server_addr = ic_servaddr; |
450 | ||
5a874db4 | 451 | if (ic_netmask == NONE) { |
1da177e4 LT |
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); | |
65cab850 DT |
458 | else if (IN_CLASSE(ntohl(ic_myaddr))) |
459 | ic_netmask = htonl(IN_CLASSE_NET); | |
1da177e4 | 460 | else { |
058bd4d2 JP |
461 | pr_err("IP-Config: Unable to guess netmask for address %pI4\n", |
462 | &ic_myaddr); | |
1da177e4 LT |
463 | return -1; |
464 | } | |
09605cc1 BS |
465 | pr_notice("IP-Config: Guessing netmask %pI4\n", |
466 | &ic_netmask); | |
1da177e4 LT |
467 | } |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
472 | /* | |
473 | * RARP support. | |
474 | */ | |
475 | ||
476 | #ifdef IPCONFIG_RARP | |
477 | ||
f2ccd8fa | 478 | static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
479 | |
480 | static struct packet_type rarp_packet_type __initdata = { | |
09640e63 | 481 | .type = cpu_to_be16(ETH_P_RARP), |
1da177e4 LT |
482 | .func = ic_rarp_recv, |
483 | }; | |
484 | ||
45e741b8 | 485 | static inline void __init ic_rarp_init(void) |
1da177e4 LT |
486 | { |
487 | dev_add_pack(&rarp_packet_type); | |
488 | } | |
489 | ||
45e741b8 | 490 | static inline void __init ic_rarp_cleanup(void) |
1da177e4 LT |
491 | { |
492 | dev_remove_pack(&rarp_packet_type); | |
493 | } | |
494 | ||
495 | /* | |
496 | * Process received RARP packet. | |
497 | */ | |
498 | static int __init | |
f2ccd8fa | 499 | ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
500 | { |
501 | struct arphdr *rarp; | |
502 | unsigned char *rarp_ptr; | |
5a874db4 | 503 | __be32 sip, tip; |
6b436d33 | 504 | unsigned char *tha; /* t for "target" */ |
1da177e4 LT |
505 | struct ic_device *d; |
506 | ||
721499e8 | 507 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
508 | goto drop; |
509 | ||
51456b29 IM |
510 | skb = skb_share_check(skb, GFP_ATOMIC); |
511 | if (!skb) | |
1da177e4 LT |
512 | return NET_RX_DROP; |
513 | ||
514 | if (!pskb_may_pull(skb, sizeof(struct arphdr))) | |
515 | goto drop; | |
516 | ||
517 | /* Basic sanity checks can be done without the lock. */ | |
9c70220b | 518 | rarp = (struct arphdr *)skb_transport_header(skb); |
1da177e4 LT |
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 | ||
988b7050 | 534 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) |
1da177e4 LT |
535 | goto drop; |
536 | ||
537 | /* OK, it is all there and looks valid, process... */ | |
9c70220b | 538 | rarp = (struct arphdr *)skb_transport_header(skb); |
1da177e4 LT |
539 | rarp_ptr = (unsigned char *) (rarp + 1); |
540 | ||
541 | /* One reply at a time, please. */ | |
542 | spin_lock(&ic_recv_lock); | |
543 | ||
544 | /* If we already have a reply, just drop the packet */ | |
545 | if (ic_got_reply) | |
546 | goto drop_unlock; | |
547 | ||
548 | /* Find the ic_device that the packet arrived on */ | |
549 | d = ic_first_dev; | |
550 | while (d && d->dev != dev) | |
551 | d = d->next; | |
552 | if (!d) | |
553 | goto drop_unlock; /* should never happen */ | |
554 | ||
555 | /* Extract variable-width fields */ | |
1da177e4 LT |
556 | rarp_ptr += dev->addr_len; |
557 | memcpy(&sip, rarp_ptr, 4); | |
558 | rarp_ptr += 4; | |
559 | tha = rarp_ptr; | |
560 | rarp_ptr += dev->addr_len; | |
561 | memcpy(&tip, rarp_ptr, 4); | |
562 | ||
563 | /* Discard packets which are not meant for us. */ | |
564 | if (memcmp(tha, dev->dev_addr, dev->addr_len)) | |
565 | goto drop_unlock; | |
566 | ||
567 | /* Discard packets which are not from specified server. */ | |
5a874db4 | 568 | if (ic_servaddr != NONE && ic_servaddr != sip) |
1da177e4 LT |
569 | goto drop_unlock; |
570 | ||
571 | /* We have a winner! */ | |
2647cffb | 572 | ic_dev = d; |
5a874db4 | 573 | if (ic_myaddr == NONE) |
1da177e4 LT |
574 | ic_myaddr = tip; |
575 | ic_servaddr = sip; | |
9dd4a13a | 576 | ic_addrservaddr = sip; |
1da177e4 LT |
577 | ic_got_reply = IC_RARP; |
578 | ||
579 | drop_unlock: | |
580 | /* Show's over. Nothing to see here. */ | |
581 | spin_unlock(&ic_recv_lock); | |
582 | ||
583 | drop: | |
584 | /* Throw the packet out. */ | |
585 | kfree_skb(skb); | |
586 | return 0; | |
587 | } | |
588 | ||
589 | ||
590 | /* | |
591 | * Send RARP request packet over a single interface. | |
592 | */ | |
593 | static void __init ic_rarp_send_if(struct ic_device *d) | |
594 | { | |
595 | struct net_device *dev = d->dev; | |
596 | arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, | |
597 | dev->dev_addr, dev->dev_addr); | |
598 | } | |
599 | #endif | |
600 | ||
842b08bb AS |
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 | ||
c04d2cb2 CN |
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 | ||
1da177e4 LT |
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 */ | |
5a874db4 AV |
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 */ | |
1da177e4 LT |
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 | ||
f2ccd8fa | 661 | static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
662 | |
663 | static struct packet_type bootp_packet_type __initdata = { | |
09640e63 | 664 | .type = cpu_to_be16(ETH_P_IP), |
1da177e4 LT |
665 | .func = ic_bootp_recv, |
666 | }; | |
667 | ||
dbb99d78 AB |
668 | /* DHCPACK can overwrite DNS if fallback was set upon first BOOTP reply */ |
669 | static int ic_nameservers_fallback __initdata; | |
670 | ||
1da177e4 LT |
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 | |
22fc5388 | 680 | ic_dhcp_init_options(u8 *options, struct ic_device *d) |
1da177e4 | 681 | { |
5a874db4 | 682 | u8 mt = ((ic_servaddr == NONE) |
1da177e4 LT |
683 | ? DHCPDISCOVER : DHCPREQUEST); |
684 | u8 *e = options; | |
62013dbb | 685 | int len; |
1da177e4 | 686 | |
22fc5388 | 687 | pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); |
1da177e4 LT |
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 */ | |
9643f455 | 717 | 26, /* MTU */ |
1da177e4 | 718 | 40, /* NIS domain name */ |
c04d2cb2 | 719 | 42, /* NTP servers */ |
1da177e4 LT |
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); | |
62013dbb | 726 | |
130c0f47 WF |
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 | } | |
62013dbb | 734 | if (*vendor_class_identifier) { |
058bd4d2 JP |
735 | pr_info("DHCP: sending class identifier \"%s\"\n", |
736 | vendor_class_identifier); | |
62013dbb RJ |
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 | } | |
26fb342c LR |
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 | } | |
1da177e4 LT |
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; | |
de1fa15b | 770 | #if CONF_NAMESERVERS_MAX > 0 |
4e1a8af2 | 771 | *e++ = 6; /* (DNS) name server request */ |
de1fa15b CN |
772 | *e++ = 4 * CONF_NAMESERVERS_MAX; |
773 | e += 4 * CONF_NAMESERVERS_MAX; | |
774 | #endif | |
1da177e4 LT |
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 | ||
e905a9ed | 785 | *e++ = 57; /* set extension buffer size for reply */ |
1da177e4 | 786 | *e++ = 2; |
e905a9ed | 787 | *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ |
1da177e4 LT |
788 | *e++ = 150; |
789 | ||
790 | *e++ = 255; /* End of the list */ | |
791 | } | |
792 | ||
793 | ||
5e953778 CF |
794 | /* |
795 | * Initialize the DHCP/BOOTP mechanism. | |
796 | */ | |
797 | static inline void __init ic_bootp_init(void) | |
798 | { | |
c04d2cb2 CN |
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 | |
300eec7c | 803 | */ |
5e953778 | 804 | ic_nameservers_predef(); |
c04d2cb2 | 805 | ic_ntp_servers_predef(); |
1da177e4 LT |
806 | |
807 | dev_add_pack(&bootp_packet_type); | |
808 | } | |
809 | ||
810 | ||
811 | /* | |
812 | * DHCP/BOOTP cleanup. | |
813 | */ | |
45e741b8 | 814 | static inline void __init ic_bootp_cleanup(void) |
1da177e4 LT |
815 | { |
816 | dev_remove_pack(&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; | |
1da177e4 | 828 | struct iphdr *h; |
66088243 HX |
829 | int hlen = LL_RESERVED_SPACE(dev); |
830 | int tlen = dev->needed_tailroom; | |
1da177e4 LT |
831 | |
832 | /* Allocate packet */ | |
66088243 | 833 | skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, |
f5184d26 | 834 | GFP_KERNEL); |
1da177e4 LT |
835 | if (!skb) |
836 | return; | |
66088243 | 837 | skb_reserve(skb, hlen); |
b080db58 | 838 | b = skb_put_zero(skb, sizeof(struct bootp_pkt)); |
1da177e4 LT |
839 | |
840 | /* Construct IP header */ | |
04b964db | 841 | skb_reset_network_header(skb); |
eddc9ec5 | 842 | h = ip_hdr(skb); |
1da177e4 LT |
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; | |
5a874db4 | 849 | h->daddr = htonl(INADDR_BROADCAST); |
1da177e4 LT |
850 | h->check = ip_fast_csum((unsigned char *) h, 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; | |
1da177e4 LT |
862 | else if (dev->type == ARPHRD_FDDI) |
863 | b->htype = ARPHRD_ETHER; | |
864 | else { | |
09605cc1 BS |
865 | pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, |
866 | dev->name); | |
1da177e4 LT |
867 | b->htype = dev->type; /* can cause undefined behavior */ |
868 | } | |
dea75bdf SH |
869 | |
870 | /* server_ip and your_ip address are both already zero per RFC2131 */ | |
1da177e4 | 871 | b->hlen = dev->addr_len; |
1da177e4 LT |
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) | |
22fc5388 | 879 | ic_dhcp_init_options(b->exten, d); |
1da177e4 LT |
880 | else |
881 | #endif | |
882 | ic_bootp_init_ext(b->exten); | |
883 | ||
884 | /* Chain packet down the line... */ | |
885 | skb->dev = dev; | |
886 | skb->protocol = htons(ETH_P_IP); | |
0c4e8581 | 887 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), |
ad79eefc RL |
888 | dev->broadcast, dev->dev_addr, skb->len) < 0) { |
889 | kfree_skb(skb); | |
890 | printk("E"); | |
891 | return; | |
892 | } | |
893 | ||
894 | if (dev_queue_xmit(skb) < 0) | |
1da177e4 LT |
895 | printk("E"); |
896 | } | |
897 | ||
898 | ||
899 | /* | |
b508d5fb | 900 | * Copy BOOTP-supplied string |
1da177e4 LT |
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 | { | |
747465ef ED |
919 | u8 servers; |
920 | int i; | |
921 | __be16 mtu; | |
1da177e4 | 922 | |
1da177e4 LT |
923 | u8 *c; |
924 | ||
09605cc1 | 925 | pr_debug("DHCP/BOOTP: Got extension %d:", *ext); |
132adf54 | 926 | for (c=ext+2; c<ext+2+ext[1]; c++) |
09605cc1 BS |
927 | pr_debug(" %02x", *c); |
928 | pr_debug("\n"); | |
1da177e4 LT |
929 | |
930 | switch (*ext++) { | |
1d67a516 JP |
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++) { | |
81ac2722 MW |
944 | if (ic_nameservers[i] == NONE || |
945 | ic_nameservers_fallback) | |
1d67a516 JP |
946 | memcpy(&ic_nameservers[i], ext+1+4*i, 4); |
947 | } | |
948 | break; | |
949 | case 12: /* Host name */ | |
b508d5fb JT |
950 | if (!ic_host_name_set) { |
951 | ic_bootp_string(utsname()->nodename, ext+1, *ext, | |
952 | __NEW_UTS_LEN); | |
953 | ic_host_name_set = 1; | |
954 | } | |
1d67a516 JP |
955 | break; |
956 | case 15: /* Domain name (DNS) */ | |
b508d5fb JT |
957 | if (!ic_domain[0]) |
958 | ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); | |
1d67a516 JP |
959 | break; |
960 | case 17: /* Root path */ | |
961 | if (!root_server_path[0]) | |
962 | ic_bootp_string(root_server_path, ext+1, *ext, | |
963 | 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(utsname()->domainname, ext+1, *ext, | |
971 | __NEW_UTS_LEN); | |
972 | break; | |
c04d2cb2 CN |
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; | |
1da177e4 LT |
982 | } |
983 | } | |
984 | ||
985 | ||
986 | /* | |
987 | * Receive BOOTP reply. | |
988 | */ | |
f2ccd8fa | 989 | 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 |
990 | { |
991 | struct bootp_pkt *b; | |
992 | struct iphdr *h; | |
993 | struct ic_device *d; | |
994 | int len, ext_len; | |
995 | ||
721499e8 | 996 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
997 | goto drop; |
998 | ||
1da177e4 LT |
999 | /* Perform verifications before taking the lock. */ |
1000 | if (skb->pkt_type == PACKET_OTHERHOST) | |
1001 | goto drop; | |
1002 | ||
51456b29 IM |
1003 | skb = skb_share_check(skb, GFP_ATOMIC); |
1004 | if (!skb) | |
1da177e4 LT |
1005 | return NET_RX_DROP; |
1006 | ||
1007 | if (!pskb_may_pull(skb, | |
1008 | sizeof(struct iphdr) + | |
1009 | sizeof(struct udphdr))) | |
1010 | goto drop; | |
1011 | ||
eddc9ec5 | 1012 | b = (struct bootp_pkt *)skb_network_header(skb); |
1da177e4 LT |
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 */ | |
56f8a75c | 1019 | if (ip_is_fragment(h)) { |
e87cc472 | 1020 | net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); |
1da177e4 LT |
1021 | goto drop; |
1022 | } | |
1023 | ||
1024 | if (skb->len < ntohs(h->tot_len)) | |
1025 | goto drop; | |
1026 | ||
1027 | if (ip_fast_csum((char *) h, 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, skb->len)) | |
1046 | goto drop; | |
1047 | ||
eddc9ec5 | 1048 | b = (struct bootp_pkt *)skb_network_header(skb); |
1da177e4 LT |
1049 | h = &b->iph; |
1050 | ||
1051 | /* One reply at a time, please. */ | |
1052 | spin_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) { | |
22fc5388 UKK |
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); | |
1da177e4 LT |
1070 | goto drop_unlock; |
1071 | } | |
1072 | ||
1073 | /* Parse extensions */ | |
1074 | if (ext_len >= 4 && | |
1075 | !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ | |
e905a9ed | 1076 | u8 *end = (u8 *) b + ntohs(b->iph.tot_len); |
1da177e4 LT |
1077 | u8 *ext; |
1078 | ||
1079 | #ifdef IPCONFIG_DHCP | |
1080 | if (ic_proto_enabled & IC_USE_DHCP) { | |
5a874db4 | 1081 | __be32 server_id = NONE; |
1da177e4 LT |
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; | |
3ff50b79 | 1101 | } |
1da177e4 LT |
1102 | } |
1103 | ||
22fc5388 | 1104 | pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); |
1da177e4 LT |
1105 | |
1106 | switch (mt) { | |
1107 | case DHCPOFFER: | |
1108 | /* While in the process of accepting one offer, | |
1109 | * ignore all others. | |
1110 | */ | |
5a874db4 | 1111 | if (ic_myaddr != NONE) |
1da177e4 LT |
1112 | goto drop_unlock; |
1113 | ||
1114 | /* Let's accept that offer. */ | |
1115 | ic_myaddr = b->your_ip; | |
1116 | ic_servaddr = server_id; | |
09605cc1 BS |
1117 | pr_debug("DHCP: Offered address %pI4 by server %pI4\n", |
1118 | &ic_myaddr, &b->iph.saddr); | |
1da177e4 LT |
1119 | /* The DHCP indicated server address takes |
1120 | * precedence over the bootp header one if | |
1121 | * they are different. | |
1122 | */ | |
5a874db4 | 1123 | if ((server_id != NONE) && |
1da177e4 LT |
1124 | (b->server_ip != server_id)) |
1125 | b->server_ip = ic_servaddr; | |
1126 | break; | |
1127 | ||
1128 | case DHCPACK: | |
1129 | if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) | |
1130 | goto drop_unlock; | |
1131 | ||
1132 | /* Yeah! */ | |
1133 | break; | |
1134 | ||
1135 | default: | |
1136 | /* Urque. Forget it*/ | |
5a874db4 AV |
1137 | ic_myaddr = NONE; |
1138 | ic_servaddr = NONE; | |
1da177e4 | 1139 | goto drop_unlock; |
3ff50b79 | 1140 | } |
1da177e4 LT |
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(opt); | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | /* We have a winner! */ | |
2647cffb | 1159 | ic_dev = d; |
1da177e4 LT |
1160 | ic_myaddr = b->your_ip; |
1161 | ic_servaddr = b->server_ip; | |
9dd4a13a | 1162 | ic_addrservaddr = b->iph.saddr; |
5a874db4 | 1163 | if (ic_gateway == NONE && b->relay_ip) |
1da177e4 | 1164 | ic_gateway = b->relay_ip; |
81ac2722 | 1165 | if (ic_nameservers[0] == NONE) { |
1da177e4 | 1166 | ic_nameservers[0] = ic_servaddr; |
81ac2722 MW |
1167 | ic_nameservers_fallback = 1; |
1168 | } | |
1da177e4 LT |
1169 | ic_got_reply = IC_BOOTP; |
1170 | ||
1171 | drop_unlock: | |
1172 | /* Show's over. Nothing to see here. */ | |
1173 | spin_unlock(&ic_recv_lock); | |
1174 | ||
1175 | drop: | |
1176 | /* Throw the packet out. */ | |
1177 | kfree_skb(skb); | |
1178 | ||
1179 | return 0; | |
e905a9ed | 1180 | } |
1da177e4 LT |
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) { | |
058bd4d2 | 1206 | pr_err("IP-Config: Incomplete network configuration information\n"); |
1da177e4 LT |
1207 | return -1; |
1208 | } | |
1209 | ||
1210 | #ifdef IPCONFIG_BOOTP | |
1211 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) | |
058bd4d2 | 1212 | pr_err("DHCP/BOOTP: No suitable device found\n"); |
1da177e4 LT |
1213 | #endif |
1214 | #ifdef IPCONFIG_RARP | |
1215 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) | |
058bd4d2 | 1216 | pr_err("RARP: No suitable device found\n"); |
1da177e4 LT |
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. | |
e905a9ed | 1240 | * [Actually we could now, but the nothing else running note still |
1da177e4 LT |
1241 | * applies.. - AC] |
1242 | */ | |
058bd4d2 JP |
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" : ""); | |
1da177e4 LT |
1248 | |
1249 | start_jiffies = jiffies; | |
1250 | d = ic_first_dev; | |
1251 | retries = CONF_SEND_RETRIES; | |
1252 | get_random_bytes(&timeout, sizeof(timeout)); | |
95c96174 | 1253 | timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); |
132adf54 | 1254 | for (;;) { |
405fd707 | 1255 | #ifdef IPCONFIG_BOOTP |
1da177e4 LT |
1256 | if (do_bootp && (d->able & IC_BOOTP)) |
1257 | ic_bootp_send_if(d, 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 | ||
e0688534 UKK |
1264 | if (!d->next) { |
1265 | jiff = jiffies + timeout; | |
1266 | while (time_before(jiffies, jiff) && !ic_got_reply) | |
1267 | schedule_timeout_uninterruptible(1); | |
1268 | } | |
1da177e4 LT |
1269 | #ifdef IPCONFIG_DHCP |
1270 | /* DHCP isn't done until we get a DHCPACK. */ | |
9d4fb27d JP |
1271 | if ((ic_got_reply & IC_BOOTP) && |
1272 | (ic_proto_enabled & IC_USE_DHCP) && | |
1273 | ic_dhcp_msgtype != DHCPACK) { | |
1da177e4 | 1274 | ic_got_reply = 0; |
2647cffb UKK |
1275 | /* continue on device that got the reply */ |
1276 | d = ic_dev; | |
6c1c36b0 | 1277 | pr_cont(","); |
1da177e4 LT |
1278 | continue; |
1279 | } | |
1280 | #endif /* IPCONFIG_DHCP */ | |
1281 | ||
1282 | if (ic_got_reply) { | |
6c1c36b0 | 1283 | pr_cont(" OK\n"); |
1da177e4 LT |
1284 | break; |
1285 | } | |
1286 | ||
1287 | if ((d = d->next)) | |
1288 | continue; | |
1289 | ||
1290 | if (! --retries) { | |
6c1c36b0 | 1291 | pr_cont(" timed out!\n"); |
1da177e4 LT |
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 | ||
6c1c36b0 | 1301 | pr_cont("."); |
1da177e4 LT |
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 | ||
7a1af5d7 | 1313 | if (!ic_got_reply) { |
5a874db4 | 1314 | ic_myaddr = NONE; |
1da177e4 | 1315 | return -1; |
7a1af5d7 | 1316 | } |
1da177e4 | 1317 | |
6c1c36b0 | 1318 | pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", |
e905a9ed | 1319 | ((ic_got_reply & IC_RARP) ? "RARP" |
09605cc1 | 1320 | : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), |
6c1c36b0 | 1321 | &ic_addrservaddr, &ic_myaddr); |
1da177e4 LT |
1322 | |
1323 | return 0; | |
1324 | } | |
1325 | ||
1326 | #endif /* IPCONFIG_DYNAMIC */ | |
1327 | ||
1328 | #ifdef CONFIG_PROC_FS | |
289e1f4e AR |
1329 | /* proc_dir_entry for /proc/net/ipconfig */ |
1330 | static struct proc_dir_entry *ipconfig_dir; | |
1da177e4 | 1331 | |
c04d2cb2 | 1332 | /* Name servers: */ |
1da177e4 LT |
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(seq, "#PROTO: %s\n", | |
1339 | (ic_proto_used & IC_RARP) ? "RARP" | |
1340 | : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); | |
1341 | else | |
1342 | seq_puts(seq, "#MANUAL\n"); | |
1343 | ||
1344 | if (ic_domain[0]) | |
1345 | seq_printf(seq, | |
1346 | "domain %s\n", ic_domain); | |
1347 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { | |
5a874db4 | 1348 | if (ic_nameservers[i] != NONE) |
673d57e7 HH |
1349 | seq_printf(seq, "nameserver %pI4\n", |
1350 | &ic_nameservers[i]); | |
1da177e4 | 1351 | } |
5a874db4 | 1352 | if (ic_servaddr != NONE) |
673d57e7 HH |
1353 | seq_printf(seq, "bootserver %pI4\n", |
1354 | &ic_servaddr); | |
1da177e4 LT |
1355 | return 0; |
1356 | } | |
1357 | ||
4d019b3f | 1358 | /* Create the /proc/net/ipconfig directory */ |
c04d2cb2 | 1359 | static int __init ipconfig_proc_net_init(void) |
4d019b3f CN |
1360 | { |
1361 | ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net); | |
1362 | if (!ipconfig_dir) | |
1363 | return -ENOMEM; | |
1364 | ||
1365 | return 0; | |
1366 | } | |
c04d2cb2 CN |
1367 | |
1368 | /* Create a new file under /proc/net/ipconfig */ | |
1369 | static int ipconfig_proc_net_create(const char *name, | |
97a32539 | 1370 | const struct proc_ops *proc_ops) |
c04d2cb2 CN |
1371 | { |
1372 | char *pname; | |
1373 | struct proc_dir_entry *p; | |
1374 | ||
1375 | if (!ipconfig_dir) | |
1376 | return -ENOMEM; | |
1377 | ||
1378 | pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name); | |
1379 | if (!pname) | |
1380 | return -ENOMEM; | |
1381 | ||
97a32539 | 1382 | p = proc_create(pname, 0444, init_net.proc_net, proc_ops); |
c04d2cb2 CN |
1383 | kfree(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 */ | |
97a32539 | 1391 | static int ntp_servers_show(struct seq_file *seq, void *v) |
c04d2cb2 CN |
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(seq, "%pI4\n", &ic_ntp_servers[i]); | |
1398 | } | |
1399 | return 0; | |
1400 | } | |
97a32539 | 1401 | DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers); |
1da177e4 LT |
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 | */ | |
5a874db4 | 1409 | __be32 __init root_nfs_parse_addr(char *name) |
1da177e4 | 1410 | { |
5a874db4 | 1411 | __be32 addr; |
1da177e4 LT |
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(name); | |
1431 | memmove(name, cp, strlen(cp) + 1); | |
1432 | } else | |
5a874db4 | 1433 | addr = NONE; |
1da177e4 LT |
1434 | |
1435 | return addr; | |
1436 | } | |
1437 | ||
964ad81c DM |
1438 | #define DEVICE_WAIT_MAX 12 /* 12 seconds */ |
1439 | ||
1440 | static int __init wait_for_devices(void) | |
1441 | { | |
1442 | int i; | |
dd429036 | 1443 | bool try_init_devs = true; |
964ad81c | 1444 | |
964ad81c DM |
1445 | for (i = 0; i < DEVICE_WAIT_MAX; i++) { |
1446 | struct net_device *dev; | |
1447 | int found = 0; | |
1448 | ||
e2ffe3ff TB |
1449 | /* make sure deferred device probes are finished */ |
1450 | wait_for_device_probe(); | |
1451 | ||
964ad81c DM |
1452 | rtnl_lock(); |
1453 | for_each_netdev(&init_net, dev) { | |
3fb72f1e | 1454 | if (ic_is_init_dev(dev)) { |
964ad81c DM |
1455 | found = 1; |
1456 | break; | |
1457 | } | |
1458 | } | |
1459 | rtnl_unlock(); | |
1460 | if (found) | |
1461 | return 0; | |
dd429036 SK |
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 | } | |
964ad81c DM |
1467 | ssleep(1); |
1468 | } | |
1469 | return -ENODEV; | |
1470 | } | |
1471 | ||
1da177e4 LT |
1472 | /* |
1473 | * IP Autoconfig dispatcher. | |
1474 | */ | |
1475 | ||
1476 | static int __init ip_auto_config(void) | |
1477 | { | |
5a874db4 | 1478 | __be32 addr; |
9d8dba6c BZ |
1479 | #ifdef IPCONFIG_DYNAMIC |
1480 | int retries = CONF_OPEN_RETRIES; | |
1481 | #endif | |
964ad81c | 1482 | int err; |
c9f64d1f | 1483 | unsigned int i, count; |
1da177e4 | 1484 | |
c04d2cb2 CN |
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) | |
300eec7c | 1488 | */ |
c04d2cb2 | 1489 | if (ic_set_manually == 0) { |
300eec7c | 1490 | ic_nameservers_predef(); |
c04d2cb2 CN |
1491 | ic_ntp_servers_predef(); |
1492 | } | |
300eec7c | 1493 | |
1da177e4 | 1494 | #ifdef CONFIG_PROC_FS |
3f3942ac | 1495 | proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show); |
4d019b3f | 1496 | |
c04d2cb2 | 1497 | if (ipconfig_proc_net_init() == 0) |
97a32539 | 1498 | ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops); |
1da177e4 LT |
1499 | #endif /* CONFIG_PROC_FS */ |
1500 | ||
1501 | if (!ic_enable) | |
1502 | return 0; | |
1503 | ||
09605cc1 | 1504 | pr_debug("IP-Config: Entered.\n"); |
1da177e4 LT |
1505 | #ifdef IPCONFIG_DYNAMIC |
1506 | try_try_again: | |
1507 | #endif | |
964ad81c DM |
1508 | /* Wait for devices to appear */ |
1509 | err = wait_for_devices(); | |
1510 | if (err) | |
1511 | return err; | |
1da177e4 LT |
1512 | |
1513 | /* Setup all network devices */ | |
964ad81c DM |
1514 | err = ic_open_devs(); |
1515 | if (err) | |
1516 | return err; | |
1da177e4 LT |
1517 | |
1518 | /* Give drivers a chance to settle */ | |
3fb72f1e | 1519 | msleep(CONF_POST_OPEN); |
1da177e4 LT |
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 | */ | |
5a874db4 | 1527 | if (ic_myaddr == NONE || |
51976f47 | 1528 | #if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT) |
9d4fb27d JP |
1529 | (root_server_addr == NONE && |
1530 | ic_servaddr == NONE && | |
51976f47 | 1531 | (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) || |
1da177e4 LT |
1532 | #endif |
1533 | ic_first_dev->next) { | |
1534 | #ifdef IPCONFIG_DYNAMIC | |
1da177e4 LT |
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) { | |
058bd4d2 | 1554 | pr_err("IP-Config: Retrying forever (NFS root)...\n"); |
1da177e4 LT |
1555 | goto try_try_again; |
1556 | } | |
1557 | #endif | |
51976f47 PAS |
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 | |
1da177e4 LT |
1564 | |
1565 | if (--retries) { | |
058bd4d2 | 1566 | pr_err("IP-Config: Reopening network devices...\n"); |
1da177e4 LT |
1567 | goto try_try_again; |
1568 | } | |
1569 | ||
1570 | /* Oh, well. At least we tried. */ | |
058bd4d2 | 1571 | pr_err("IP-Config: Auto-configuration of network failed\n"); |
1da177e4 LT |
1572 | return -1; |
1573 | } | |
1574 | #else /* !DYNAMIC */ | |
058bd4d2 | 1575 | pr_err("IP-Config: Incomplete network configuration information\n"); |
1da177e4 LT |
1576 | ic_close_devs(); |
1577 | return -1; | |
1578 | #endif /* IPCONFIG_DYNAMIC */ | |
1579 | } else { | |
1580 | /* Device selected manually or only one device -> use it */ | |
2647cffb | 1581 | ic_dev = ic_first_dev; |
1da177e4 LT |
1582 | } |
1583 | ||
1584 | addr = root_nfs_parse_addr(root_server_path); | |
5a874db4 | 1585 | if (root_server_addr == NONE) |
1da177e4 LT |
1586 | root_server_addr = addr; |
1587 | ||
1588 | /* | |
25985edc | 1589 | * Use defaults wherever applicable. |
1da177e4 LT |
1590 | */ |
1591 | if (ic_defaults() < 0) | |
1592 | return -1; | |
1593 | ||
1da177e4 LT |
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 | */ | |
058bd4d2 | 1605 | pr_info("IP-Config: Complete:\n"); |
9ecd1c3d CF |
1606 | |
1607 | pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", | |
2647cffb | 1608 | ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, |
9ecd1c3d | 1609 | &ic_myaddr, &ic_netmask, &ic_gateway); |
058bd4d2 JP |
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); | |
9643f455 | 1614 | if (ic_dev_mtu) |
058bd4d2 | 1615 | pr_cont(", mtu=%d", ic_dev_mtu); |
e18bdc83 | 1616 | /* Name servers (if any): */ |
c9f64d1f | 1617 | for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) { |
5e953778 | 1618 | if (ic_nameservers[i] != NONE) { |
e18bdc83 CN |
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]); | |
c9f64d1f TR |
1625 | |
1626 | count++; | |
5e953778 | 1627 | } |
c9f64d1f | 1628 | if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0) |
e18bdc83 CN |
1629 | pr_cont("\n"); |
1630 | } | |
c04d2cb2 | 1631 | /* NTP servers (if any): */ |
c9f64d1f | 1632 | for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) { |
c04d2cb2 CN |
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]); | |
c9f64d1f TR |
1640 | |
1641 | count++; | |
c04d2cb2 | 1642 | } |
c9f64d1f | 1643 | if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0) |
c04d2cb2 CN |
1644 | pr_cont("\n"); |
1645 | } | |
1da177e4 LT |
1646 | #endif /* !SILENT */ |
1647 | ||
9c706a49 UKK |
1648 | /* |
1649 | * Close all network devices except the device we've | |
1650 | * autoconfigured and set up routes. | |
1651 | */ | |
9c706a49 | 1652 | if (ic_setup_if() < 0 || ic_setup_routes() < 0) |
d2d371ae TR |
1653 | err = -1; |
1654 | else | |
1655 | err = 0; | |
9c706a49 | 1656 | |
d2d371ae | 1657 | ic_close_devs(); |
9c706a49 | 1658 | |
d2d371ae | 1659 | return err; |
1da177e4 LT |
1660 | } |
1661 | ||
1662 | late_initcall(ip_auto_config); | |
1663 | ||
1664 | ||
1665 | /* | |
1666 | * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel | |
3eb30c51 | 1667 | * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst. |
1da177e4 LT |
1668 | */ |
1669 | static int __init ic_proto_name(char *name) | |
1670 | { | |
1671 | if (!strcmp(name, "on") || !strcmp(name, "any")) { | |
1672 | return 1; | |
1673 | } | |
a6c05c3d | 1674 | if (!strcmp(name, "off") || !strcmp(name, "none")) { |
92ffb85d | 1675 | return 0; |
a6c05c3d | 1676 | } |
1da177e4 | 1677 | #ifdef CONFIG_IP_PNP_DHCP |
26fb342c LR |
1678 | else if (!strncmp(name, "dhcp", 4)) { |
1679 | char *client_id; | |
1680 | ||
1da177e4 | 1681 | ic_proto_enabled &= ~IC_RARP; |
26fb342c LR |
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(client_id, 0, dhcp_client_identifier)) | |
09605cc1 | 1692 | pr_debug("DHCP: Invalid client identifier type\n"); |
26fb342c LR |
1693 | strncpy(dhcp_client_identifier + 1, v + 1, 251); |
1694 | *v = ','; | |
1695 | } | |
1da177e4 LT |
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; | |
9cecd07c | 1726 | ic_enable = 1; |
1da177e4 | 1727 | |
92ffb85d AW |
1728 | /* |
1729 | * If any dhcp, bootp etc options are set, leave autoconfig on | |
1730 | * and skip the below static IP processing. | |
1731 | */ | |
1da177e4 LT |
1732 | if (ic_proto_name(addrs)) |
1733 | return 1; | |
1734 | ||
92ffb85d AW |
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 | ||
c04d2cb2 | 1743 | /* Initialise all name servers and NTP servers to NONE */ |
5e953778 | 1744 | ic_nameservers_predef(); |
c04d2cb2 | 1745 | ic_ntp_servers_predef(); |
5e953778 | 1746 | |
92ffb85d | 1747 | /* Parse string for static IP assignment. */ |
1da177e4 LT |
1748 | ip = addrs; |
1749 | while (ip && *ip) { | |
1750 | if ((cp = strchr(ip, ':'))) | |
1751 | *cp++ = '\0'; | |
1752 | if (strlen(ip) > 0) { | |
09605cc1 | 1753 | pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); |
1da177e4 LT |
1754 | switch (num) { |
1755 | case 0: | |
e6f1cebf | 1756 | if ((ic_myaddr = in_aton(ip)) == ANY) |
5a874db4 | 1757 | ic_myaddr = NONE; |
1da177e4 LT |
1758 | break; |
1759 | case 1: | |
e6f1cebf | 1760 | if ((ic_servaddr = in_aton(ip)) == ANY) |
5a874db4 | 1761 | ic_servaddr = NONE; |
1da177e4 LT |
1762 | break; |
1763 | case 2: | |
e6f1cebf | 1764 | if ((ic_gateway = in_aton(ip)) == ANY) |
5a874db4 | 1765 | ic_gateway = NONE; |
1da177e4 LT |
1766 | break; |
1767 | case 3: | |
e6f1cebf | 1768 | if ((ic_netmask = in_aton(ip)) == ANY) |
5a874db4 | 1769 | ic_netmask = NONE; |
1da177e4 LT |
1770 | break; |
1771 | case 4: | |
1772 | if ((dp = strchr(ip, '.'))) { | |
1773 | *dp++ = '\0'; | |
634b215b | 1774 | strscpy(utsname()->domainname, dp, |
e9ff3990 | 1775 | sizeof(utsname()->domainname)); |
1da177e4 | 1776 | } |
634b215b | 1777 | strscpy(utsname()->nodename, ip, |
e9ff3990 | 1778 | sizeof(utsname()->nodename)); |
1da177e4 LT |
1779 | ic_host_name_set = 1; |
1780 | break; | |
1781 | case 5: | |
634b215b | 1782 | strscpy(user_dev_name, ip, sizeof(user_dev_name)); |
1da177e4 LT |
1783 | break; |
1784 | case 6: | |
92ffb85d AW |
1785 | if (ic_proto_name(ip) == 0 && |
1786 | ic_myaddr == NONE) { | |
1787 | ic_enable = 0; | |
1788 | } | |
1da177e4 | 1789 | break; |
5e953778 CF |
1790 | case 7: |
1791 | if (CONF_NAMESERVERS_MAX >= 1) { | |
1792 | ic_nameservers[0] = in_aton(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(ip); | |
1800 | if (ic_nameservers[1] == ANY) | |
1801 | ic_nameservers[1] = NONE; | |
1802 | } | |
1803 | break; | |
c04d2cb2 CN |
1804 | case 9: |
1805 | if (CONF_NTP_SERVERS_MAX >= 1) { | |
1806 | ic_ntp_servers[0] = in_aton(ip); | |
1807 | if (ic_ntp_servers[0] == ANY) | |
1808 | ic_ntp_servers[0] = NONE; | |
1809 | } | |
1810 | break; | |
1da177e4 LT |
1811 | } |
1812 | } | |
1813 | ip = cp; | |
1814 | num++; | |
1815 | } | |
1816 | ||
1817 | return 1; | |
1818 | } | |
b37f4d7b | 1819 | __setup("ip=", ip_auto_config_setup); |
1da177e4 LT |
1820 | |
1821 | static int __init nfsaddrs_config_setup(char *addrs) | |
1822 | { | |
1823 | return ip_auto_config_setup(addrs); | |
1824 | } | |
b37f4d7b | 1825 | __setup("nfsaddrs=", nfsaddrs_config_setup); |
1da177e4 | 1826 | |
62013dbb RJ |
1827 | static int __init vendor_class_identifier_setup(char *addrs) |
1828 | { | |
634b215b | 1829 | if (strscpy(vendor_class_identifier, addrs, |
62013dbb RJ |
1830 | sizeof(vendor_class_identifier)) |
1831 | >= sizeof(vendor_class_identifier)) | |
09605cc1 | 1832 | pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", |
058bd4d2 | 1833 | vendor_class_identifier); |
62013dbb RJ |
1834 | return 1; |
1835 | } | |
62013dbb | 1836 | __setup("dhcpclass=", vendor_class_identifier_setup); |
3fc46fc9 MK |
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(str, 0, &carrier_timeout); | |
1846 | if (ret) | |
1847 | return 0; | |
1848 | ||
1849 | return 1; | |
1850 | } | |
1851 | __setup("carrier_timeout=", set_carrier_timeout); |