2 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
3 * user-supplied information to configure own IP address and routes.
5 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
7 * Derived from network configuration code in fs/nfs/nfsroot.c,
8 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
10 * BOOTP rewritten to construct and analyse packets itself instead
11 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
12 * -- MJ, December 1998
14 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
15 * initialization scheme.
16 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
18 * DHCP support added. To users this looks like a whole separate
19 * protocol, but we know it's just a bag on the side of BOOTP.
20 * -- Chip Salzenberg <chip@valinux.com>, May 2000
22 * Ported DHCP support from 2.2.16 to 2.4.0-test4
23 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
25 * Merged changes from 2.2.19 into 2.4.3
26 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
28 * Multiple Nameservers in /proc/net/pnp
29 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/kernel.h>
35 #include <linux/jiffies.h>
36 #include <linux/random.h>
37 #include <linux/init.h>
38 #include <linux/utsname.h>
41 #include <linux/inet.h>
42 #include <linux/inetdevice.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
47 #include <linux/socket.h>
48 #include <linux/route.h>
49 #include <linux/udp.h>
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <linux/major.h>
53 #include <linux/root_dev.h>
54 #include <linux/delay.h>
55 #include <linux/nfs_fs.h>
56 #include <linux/slab.h>
57 #include <net/net_namespace.h>
60 #include <net/ipconfig.h>
61 #include <net/route.h>
63 #include <asm/uaccess.h>
64 #include <net/checksum.h>
65 #include <asm/processor.h>
67 /* Define this to allow debugging output */
71 #define DBG(x) printk x
73 #define DBG(x) do { } while(0)
76 #if defined(CONFIG_IP_PNP_DHCP)
79 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
80 #define IPCONFIG_BOOTP
82 #if defined(CONFIG_IP_PNP_RARP)
85 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
86 #define IPCONFIG_DYNAMIC
89 /* Define the friendly delay before and after opening net devices */
90 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
91 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
93 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
94 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
95 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
96 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
97 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
98 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
99 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
100 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
101 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
102 - '3' from resolv.h */
104 #define NONE cpu_to_be32(INADDR_NONE)
105 #define ANY cpu_to_be32(INADDR_ANY)
108 * Public IP configuration
111 /* This is used by platforms which might be able to set the ipconfig
112 * variables using firmware environment vars. If this is set, it will
113 * ignore such firmware variables.
115 int ic_set_manually __initdata
= 0; /* IPconfig parameters set manually */
117 static int ic_enable __initdata
= 0; /* IP config enabled? */
119 /* Protocol choice */
120 int ic_proto_enabled __initdata
= 0
121 #ifdef IPCONFIG_BOOTP
124 #ifdef CONFIG_IP_PNP_DHCP
132 static int ic_host_name_set __initdata
= 0; /* Host name set by us? */
134 __be32 ic_myaddr
= NONE
; /* My IP address */
135 static __be32 ic_netmask
= NONE
; /* Netmask for local subnet */
136 __be32 ic_gateway
= NONE
; /* Gateway IP address */
138 __be32 ic_servaddr
= NONE
; /* Boot server IP address */
140 __be32 root_server_addr
= NONE
; /* Address of NFS server */
141 u8 root_server_path
[256] = { 0, }; /* Path to mount as root */
143 u32 ic_dev_xid
; /* Device under configuration */
145 /* vendor class identifier */
146 static char vendor_class_identifier
[253] __initdata
;
148 /* Persistent data: */
150 static int ic_proto_used
; /* Protocol used, if any */
151 static __be32 ic_nameservers
[CONF_NAMESERVERS_MAX
]; /* DNS Server IP addresses */
152 static u8 ic_domain
[64]; /* DNS (not NIS) domain name */
158 /* Name of user-selected boot device */
159 static char user_dev_name
[IFNAMSIZ
] __initdata
= { 0, };
161 /* Protocols supported by available interfaces */
162 static int ic_proto_have_if __initdata
= 0;
164 /* MTU for boot device */
165 static int ic_dev_mtu __initdata
= 0;
167 #ifdef IPCONFIG_DYNAMIC
168 static DEFINE_SPINLOCK(ic_recv_lock
);
169 static volatile int ic_got_reply __initdata
= 0; /* Proto(s) that replied */
172 static int ic_dhcp_msgtype __initdata
= 0; /* DHCP msg type received */
181 struct ic_device
*next
;
182 struct net_device
*dev
;
183 unsigned short flags
;
188 static struct ic_device
*ic_first_dev __initdata
= NULL
;/* List of open device */
189 static struct net_device
*ic_dev __initdata
= NULL
; /* Selected device */
191 static bool __init
ic_is_init_dev(struct net_device
*dev
)
193 if (dev
->flags
& IFF_LOOPBACK
)
195 return user_dev_name
[0] ? !strcmp(dev
->name
, user_dev_name
) :
196 (!(dev
->flags
& IFF_LOOPBACK
) &&
197 (dev
->flags
& (IFF_POINTOPOINT
|IFF_BROADCAST
)) &&
198 strncmp(dev
->name
, "dummy", 5));
201 static int __init
ic_open_devs(void)
203 struct ic_device
*d
, **last
;
204 struct net_device
*dev
;
205 unsigned short oflags
;
208 last
= &ic_first_dev
;
211 /* bring loopback device up first */
212 for_each_netdev(&init_net
, dev
) {
213 if (!(dev
->flags
& IFF_LOOPBACK
))
215 if (dev_change_flags(dev
, dev
->flags
| IFF_UP
) < 0)
216 printk(KERN_ERR
"IP-Config: Failed to open %s\n", dev
->name
);
219 for_each_netdev(&init_net
, dev
) {
220 if (ic_is_init_dev(dev
)) {
225 printk(KERN_WARNING
"DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev
->name
, dev
->mtu
);
226 if (!(dev
->flags
& IFF_NOARP
))
228 able
&= ic_proto_enabled
;
229 if (ic_proto_enabled
&& !able
)
232 if (dev_change_flags(dev
, oflags
| IFF_UP
) < 0) {
233 printk(KERN_ERR
"IP-Config: Failed to open %s\n", dev
->name
);
236 if (!(d
= kmalloc(sizeof(struct ic_device
), GFP_KERNEL
))) {
246 get_random_bytes(&d
->xid
, sizeof(__be32
));
249 ic_proto_have_if
|= able
;
250 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
251 dev
->name
, able
, d
->xid
));
255 /* no point in waiting if we could not bring up at least one device */
259 /* wait for a carrier on at least one device */
261 while (jiffies
- start
< msecs_to_jiffies(CONF_CARRIER_TIMEOUT
)) {
262 for_each_netdev(&init_net
, dev
)
263 if (ic_is_init_dev(dev
) && netif_carrier_ok(dev
))
274 if (user_dev_name
[0])
275 printk(KERN_ERR
"IP-Config: Device `%s' not found.\n", user_dev_name
);
277 printk(KERN_ERR
"IP-Config: No network devices available.\n");
283 static void __init
ic_close_devs(void)
285 struct ic_device
*d
, *next
;
286 struct net_device
*dev
;
294 DBG(("IP-Config: Downing %s\n", dev
->name
));
295 dev_change_flags(dev
, d
->flags
);
303 * Interface to various network functions.
307 set_sockaddr(struct sockaddr_in
*sin
, __be32 addr
, __be16 port
)
309 sin
->sin_family
= AF_INET
;
310 sin
->sin_addr
.s_addr
= addr
;
311 sin
->sin_port
= port
;
314 static int __init
ic_devinet_ioctl(unsigned int cmd
, struct ifreq
*arg
)
318 mm_segment_t oldfs
= get_fs();
320 res
= devinet_ioctl(&init_net
, cmd
, (struct ifreq __user
*) arg
);
325 static int __init
ic_dev_ioctl(unsigned int cmd
, struct ifreq
*arg
)
329 mm_segment_t oldfs
= get_fs();
331 res
= dev_ioctl(&init_net
, cmd
, (struct ifreq __user
*) arg
);
336 static int __init
ic_route_ioctl(unsigned int cmd
, struct rtentry
*arg
)
340 mm_segment_t oldfs
= get_fs();
342 res
= ip_rt_ioctl(&init_net
, cmd
, (void __user
*) arg
);
348 * Set up interface addresses and routes.
351 static int __init
ic_setup_if(void)
354 struct sockaddr_in
*sin
= (void *) &ir
.ifr_ifru
.ifru_addr
;
357 memset(&ir
, 0, sizeof(ir
));
358 strcpy(ir
.ifr_ifrn
.ifrn_name
, ic_dev
->name
);
359 set_sockaddr(sin
, ic_myaddr
, 0);
360 if ((err
= ic_devinet_ioctl(SIOCSIFADDR
, &ir
)) < 0) {
361 printk(KERN_ERR
"IP-Config: Unable to set interface address (%d).\n", err
);
364 set_sockaddr(sin
, ic_netmask
, 0);
365 if ((err
= ic_devinet_ioctl(SIOCSIFNETMASK
, &ir
)) < 0) {
366 printk(KERN_ERR
"IP-Config: Unable to set interface netmask (%d).\n", err
);
369 set_sockaddr(sin
, ic_myaddr
| ~ic_netmask
, 0);
370 if ((err
= ic_devinet_ioctl(SIOCSIFBRDADDR
, &ir
)) < 0) {
371 printk(KERN_ERR
"IP-Config: Unable to set interface broadcast address (%d).\n", err
);
374 /* Handle the case where we need non-standard MTU on the boot link (a network
375 * using jumbo frames, for instance). If we can't set the mtu, don't error
376 * out, we'll try to muddle along.
378 if (ic_dev_mtu
!= 0) {
379 strcpy(ir
.ifr_name
, ic_dev
->name
);
380 ir
.ifr_mtu
= ic_dev_mtu
;
381 if ((err
= ic_dev_ioctl(SIOCSIFMTU
, &ir
)) < 0)
382 printk(KERN_ERR
"IP-Config: Unable to set interface mtu to %d (%d).\n",
388 static int __init
ic_setup_routes(void)
390 /* No need to setup device routes, only the default route... */
392 if (ic_gateway
!= NONE
) {
396 memset(&rm
, 0, sizeof(rm
));
397 if ((ic_gateway
^ ic_myaddr
) & ic_netmask
) {
398 printk(KERN_ERR
"IP-Config: Gateway not on directly connected network.\n");
401 set_sockaddr((struct sockaddr_in
*) &rm
.rt_dst
, 0, 0);
402 set_sockaddr((struct sockaddr_in
*) &rm
.rt_genmask
, 0, 0);
403 set_sockaddr((struct sockaddr_in
*) &rm
.rt_gateway
, ic_gateway
, 0);
404 rm
.rt_flags
= RTF_UP
| RTF_GATEWAY
;
405 if ((err
= ic_route_ioctl(SIOCADDRT
, &rm
)) < 0) {
406 printk(KERN_ERR
"IP-Config: Cannot add default route (%d).\n", err
);
415 * Fill in default values for all missing parameters.
418 static int __init
ic_defaults(void)
421 * At this point we have no userspace running so need not
422 * claim locks on system_utsname
425 if (!ic_host_name_set
)
426 sprintf(init_utsname()->nodename
, "%pI4", &ic_myaddr
);
428 if (root_server_addr
== NONE
)
429 root_server_addr
= ic_servaddr
;
431 if (ic_netmask
== NONE
) {
432 if (IN_CLASSA(ntohl(ic_myaddr
)))
433 ic_netmask
= htonl(IN_CLASSA_NET
);
434 else if (IN_CLASSB(ntohl(ic_myaddr
)))
435 ic_netmask
= htonl(IN_CLASSB_NET
);
436 else if (IN_CLASSC(ntohl(ic_myaddr
)))
437 ic_netmask
= htonl(IN_CLASSC_NET
);
439 printk(KERN_ERR
"IP-Config: Unable to guess netmask for address %pI4\n",
443 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask
);
455 static int ic_rarp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
);
457 static struct packet_type rarp_packet_type __initdata
= {
458 .type
= cpu_to_be16(ETH_P_RARP
),
459 .func
= ic_rarp_recv
,
462 static inline void __init
ic_rarp_init(void)
464 dev_add_pack(&rarp_packet_type
);
467 static inline void __init
ic_rarp_cleanup(void)
469 dev_remove_pack(&rarp_packet_type
);
473 * Process received RARP packet.
476 ic_rarp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
)
479 unsigned char *rarp_ptr
;
481 unsigned char *sha
, *tha
; /* s for "source", t for "target" */
484 if (!net_eq(dev_net(dev
), &init_net
))
487 if ((skb
= skb_share_check(skb
, GFP_ATOMIC
)) == NULL
)
490 if (!pskb_may_pull(skb
, sizeof(struct arphdr
)))
493 /* Basic sanity checks can be done without the lock. */
494 rarp
= (struct arphdr
*)skb_transport_header(skb
);
496 /* If this test doesn't pass, it's not IP, or we should
499 if (rarp
->ar_hln
!= dev
->addr_len
|| dev
->type
!= ntohs(rarp
->ar_hrd
))
502 /* If it's not a RARP reply, delete it. */
503 if (rarp
->ar_op
!= htons(ARPOP_RREPLY
))
506 /* If it's not Ethernet, delete it. */
507 if (rarp
->ar_pro
!= htons(ETH_P_IP
))
510 if (!pskb_may_pull(skb
, arp_hdr_len(dev
)))
513 /* OK, it is all there and looks valid, process... */
514 rarp
= (struct arphdr
*)skb_transport_header(skb
);
515 rarp_ptr
= (unsigned char *) (rarp
+ 1);
517 /* One reply at a time, please. */
518 spin_lock(&ic_recv_lock
);
520 /* If we already have a reply, just drop the packet */
524 /* Find the ic_device that the packet arrived on */
526 while (d
&& d
->dev
!= dev
)
529 goto drop_unlock
; /* should never happen */
531 /* Extract variable-width fields */
533 rarp_ptr
+= dev
->addr_len
;
534 memcpy(&sip
, rarp_ptr
, 4);
537 rarp_ptr
+= dev
->addr_len
;
538 memcpy(&tip
, rarp_ptr
, 4);
540 /* Discard packets which are not meant for us. */
541 if (memcmp(tha
, dev
->dev_addr
, dev
->addr_len
))
544 /* Discard packets which are not from specified server. */
545 if (ic_servaddr
!= NONE
&& ic_servaddr
!= sip
)
548 /* We have a winner! */
550 if (ic_myaddr
== NONE
)
553 ic_got_reply
= IC_RARP
;
556 /* Show's over. Nothing to see here. */
557 spin_unlock(&ic_recv_lock
);
560 /* Throw the packet out. */
567 * Send RARP request packet over a single interface.
569 static void __init
ic_rarp_send_if(struct ic_device
*d
)
571 struct net_device
*dev
= d
->dev
;
572 arp_send(ARPOP_RREQUEST
, ETH_P_RARP
, 0, dev
, 0, NULL
,
573 dev
->dev_addr
, dev
->dev_addr
);
578 * DHCP/BOOTP support.
581 #ifdef IPCONFIG_BOOTP
583 struct bootp_pkt
{ /* BOOTP packet format */
584 struct iphdr iph
; /* IP header */
585 struct udphdr udph
; /* UDP header */
586 u8 op
; /* 1=request, 2=reply */
587 u8 htype
; /* HW address type */
588 u8 hlen
; /* HW address length */
589 u8 hops
; /* Used only by gateways */
590 __be32 xid
; /* Transaction ID */
591 __be16 secs
; /* Seconds since we started */
592 __be16 flags
; /* Just what it says */
593 __be32 client_ip
; /* Client's IP address if known */
594 __be32 your_ip
; /* Assigned IP address */
595 __be32 server_ip
; /* (Next, e.g. NFS) Server's IP address */
596 __be32 relay_ip
; /* IP address of BOOTP relay */
597 u8 hw_addr
[16]; /* Client's HW address */
598 u8 serv_name
[64]; /* Server host name */
599 u8 boot_file
[128]; /* Name of boot file */
600 u8 exten
[312]; /* DHCP options / BOOTP vendor extensions */
604 #define BOOTP_REQUEST 1
605 #define BOOTP_REPLY 2
607 /* DHCP message types */
608 #define DHCPDISCOVER 1
610 #define DHCPREQUEST 3
611 #define DHCPDECLINE 4
614 #define DHCPRELEASE 7
617 static int ic_bootp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
);
619 static struct packet_type bootp_packet_type __initdata
= {
620 .type
= cpu_to_be16(ETH_P_IP
),
621 .func
= ic_bootp_recv
,
626 * Initialize DHCP/BOOTP extension fields in the request.
629 static const u8 ic_bootp_cookie
[4] = { 99, 130, 83, 99 };
634 ic_dhcp_init_options(u8
*options
)
636 u8 mt
= ((ic_servaddr
== NONE
)
637 ? DHCPDISCOVER
: DHCPREQUEST
);
641 #ifdef IPCONFIG_DEBUG
642 printk("DHCP: Sending message type %d\n", mt
);
645 memcpy(e
, ic_bootp_cookie
, 4); /* RFC1048 Magic Cookie */
648 *e
++ = 53; /* DHCP message type */
652 if (mt
== DHCPREQUEST
) {
653 *e
++ = 54; /* Server ID (IP address) */
655 memcpy(e
, &ic_servaddr
, 4);
658 *e
++ = 50; /* Requested IP address */
660 memcpy(e
, &ic_myaddr
, 4);
666 static const u8 ic_req_params
[] = {
668 3, /* Default gateway */
671 15, /* Domain name */
674 40, /* NIS domain name */
677 *e
++ = 55; /* Parameter request list */
678 *e
++ = sizeof(ic_req_params
);
679 memcpy(e
, ic_req_params
, sizeof(ic_req_params
));
680 e
+= sizeof(ic_req_params
);
682 if (ic_host_name_set
) {
683 *e
++ = 12; /* host-name */
684 len
= strlen(utsname()->nodename
);
686 memcpy(e
, utsname()->nodename
, len
);
689 if (*vendor_class_identifier
) {
690 printk(KERN_INFO
"DHCP: sending class identifier \"%s\"\n",
691 vendor_class_identifier
);
692 *e
++ = 60; /* Class-identifier */
693 len
= strlen(vendor_class_identifier
);
695 memcpy(e
, vendor_class_identifier
, len
);
700 *e
++ = 255; /* End of the list */
703 #endif /* IPCONFIG_DHCP */
705 static void __init
ic_bootp_init_ext(u8
*e
)
707 memcpy(e
, ic_bootp_cookie
, 4); /* RFC1048 Magic Cookie */
709 *e
++ = 1; /* Subnet mask request */
712 *e
++ = 3; /* Default gateway request */
715 *e
++ = 5; /* Name server request */
718 *e
++ = 12; /* Host name request */
721 *e
++ = 40; /* NIS Domain name request */
724 *e
++ = 17; /* Boot path */
728 *e
++ = 57; /* set extension buffer size for reply */
730 *e
++ = 1; /* 128+236+8+20+14, see dhcpd sources */
733 *e
++ = 255; /* End of the list */
738 * Initialize the DHCP/BOOTP mechanism.
740 static inline void __init
ic_bootp_init(void)
744 for (i
= 0; i
< CONF_NAMESERVERS_MAX
; i
++)
745 ic_nameservers
[i
] = NONE
;
747 dev_add_pack(&bootp_packet_type
);
752 * DHCP/BOOTP cleanup.
754 static inline void __init
ic_bootp_cleanup(void)
756 dev_remove_pack(&bootp_packet_type
);
761 * Send DHCP/BOOTP request to single interface.
763 static void __init
ic_bootp_send_if(struct ic_device
*d
, unsigned long jiffies_diff
)
765 struct net_device
*dev
= d
->dev
;
770 /* Allocate packet */
771 skb
= alloc_skb(sizeof(struct bootp_pkt
) + LL_ALLOCATED_SPACE(dev
) + 15,
775 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
776 b
= (struct bootp_pkt
*) skb_put(skb
, sizeof(struct bootp_pkt
));
777 memset(b
, 0, sizeof(struct bootp_pkt
));
779 /* Construct IP header */
780 skb_reset_network_header(skb
);
784 h
->tot_len
= htons(sizeof(struct bootp_pkt
));
785 h
->frag_off
= htons(IP_DF
);
787 h
->protocol
= IPPROTO_UDP
;
788 h
->daddr
= htonl(INADDR_BROADCAST
);
789 h
->check
= ip_fast_csum((unsigned char *) h
, h
->ihl
);
791 /* Construct UDP header */
792 b
->udph
.source
= htons(68);
793 b
->udph
.dest
= htons(67);
794 b
->udph
.len
= htons(sizeof(struct bootp_pkt
) - sizeof(struct iphdr
));
795 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
797 /* Construct DHCP/BOOTP header */
798 b
->op
= BOOTP_REQUEST
;
799 if (dev
->type
< 256) /* check for false types */
800 b
->htype
= dev
->type
;
801 else if (dev
->type
== ARPHRD_IEEE802_TR
) /* fix for token ring */
802 b
->htype
= ARPHRD_IEEE802
;
803 else if (dev
->type
== ARPHRD_FDDI
)
804 b
->htype
= ARPHRD_ETHER
;
806 printk("Unknown ARP type 0x%04x for device %s\n", dev
->type
, dev
->name
);
807 b
->htype
= dev
->type
; /* can cause undefined behavior */
810 /* server_ip and your_ip address are both already zero per RFC2131 */
811 b
->hlen
= dev
->addr_len
;
812 memcpy(b
->hw_addr
, dev
->dev_addr
, dev
->addr_len
);
813 b
->secs
= htons(jiffies_diff
/ HZ
);
816 /* add DHCP options or BOOTP extensions */
818 if (ic_proto_enabled
& IC_USE_DHCP
)
819 ic_dhcp_init_options(b
->exten
);
822 ic_bootp_init_ext(b
->exten
);
824 /* Chain packet down the line... */
826 skb
->protocol
= htons(ETH_P_IP
);
827 if (dev_hard_header(skb
, dev
, ntohs(skb
->protocol
),
828 dev
->broadcast
, dev
->dev_addr
, skb
->len
) < 0 ||
829 dev_queue_xmit(skb
) < 0)
835 * Copy BOOTP-supplied string if not already set.
837 static int __init
ic_bootp_string(char *dest
, char *src
, int len
, int max
)
843 memcpy(dest
, src
, len
);
850 * Process BOOTP extensions.
852 static void __init
ic_do_bootp_ext(u8
*ext
)
858 #ifdef IPCONFIG_DEBUG
861 printk("DHCP/BOOTP: Got extension %d:",*ext
);
862 for (c
=ext
+2; c
<ext
+2+ext
[1]; c
++)
868 case 1: /* Subnet mask */
869 if (ic_netmask
== NONE
)
870 memcpy(&ic_netmask
, ext
+1, 4);
872 case 3: /* Default gateway */
873 if (ic_gateway
== NONE
)
874 memcpy(&ic_gateway
, ext
+1, 4);
876 case 6: /* DNS server */
878 if (servers
> CONF_NAMESERVERS_MAX
)
879 servers
= CONF_NAMESERVERS_MAX
;
880 for (i
= 0; i
< servers
; i
++) {
881 if (ic_nameservers
[i
] == NONE
)
882 memcpy(&ic_nameservers
[i
], ext
+1+4*i
, 4);
885 case 12: /* Host name */
886 ic_bootp_string(utsname()->nodename
, ext
+1, *ext
,
888 ic_host_name_set
= 1;
890 case 15: /* Domain name (DNS) */
891 ic_bootp_string(ic_domain
, ext
+1, *ext
, sizeof(ic_domain
));
893 case 17: /* Root path */
894 if (!root_server_path
[0])
895 ic_bootp_string(root_server_path
, ext
+1, *ext
,
896 sizeof(root_server_path
));
898 case 26: /* Interface MTU */
899 memcpy(&mtu
, ext
+1, sizeof(mtu
));
900 ic_dev_mtu
= ntohs(mtu
);
902 case 40: /* NIS Domain name (_not_ DNS) */
903 ic_bootp_string(utsname()->domainname
, ext
+1, *ext
,
911 * Receive BOOTP reply.
913 static int __init
ic_bootp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
)
920 if (!net_eq(dev_net(dev
), &init_net
))
923 /* Perform verifications before taking the lock. */
924 if (skb
->pkt_type
== PACKET_OTHERHOST
)
927 if ((skb
= skb_share_check(skb
, GFP_ATOMIC
)) == NULL
)
930 if (!pskb_may_pull(skb
,
931 sizeof(struct iphdr
) +
932 sizeof(struct udphdr
)))
935 b
= (struct bootp_pkt
*)skb_network_header(skb
);
938 if (h
->ihl
!= 5 || h
->version
!= 4 || h
->protocol
!= IPPROTO_UDP
)
941 /* Fragments are not supported */
942 if (ip_is_fragment(h
)) {
944 printk(KERN_ERR
"DHCP/BOOTP: Ignoring fragmented "
949 if (skb
->len
< ntohs(h
->tot_len
))
952 if (ip_fast_csum((char *) h
, h
->ihl
))
955 if (b
->udph
.source
!= htons(67) || b
->udph
.dest
!= htons(68))
958 if (ntohs(h
->tot_len
) < ntohs(b
->udph
.len
) + sizeof(struct iphdr
))
961 len
= ntohs(b
->udph
.len
) - sizeof(struct udphdr
);
962 ext_len
= len
- (sizeof(*b
) -
963 sizeof(struct iphdr
) -
964 sizeof(struct udphdr
) -
969 /* Ok the front looks good, make sure we can get at the rest. */
970 if (!pskb_may_pull(skb
, skb
->len
))
973 b
= (struct bootp_pkt
*)skb_network_header(skb
);
976 /* One reply at a time, please. */
977 spin_lock(&ic_recv_lock
);
979 /* If we already have a reply, just drop the packet */
983 /* Find the ic_device that the packet arrived on */
985 while (d
&& d
->dev
!= dev
)
988 goto drop_unlock
; /* should never happen */
990 /* Is it a reply to our BOOTP request? */
991 if (b
->op
!= BOOTP_REPLY
||
994 printk(KERN_ERR
"DHCP/BOOTP: Reply not for us, "
1000 /* Is it a reply for the device we are configuring? */
1001 if (b
->xid
!= ic_dev_xid
) {
1002 if (net_ratelimit())
1003 printk(KERN_ERR
"DHCP/BOOTP: Ignoring delayed packet\n");
1007 /* Parse extensions */
1009 !memcmp(b
->exten
, ic_bootp_cookie
, 4)) { /* Check magic cookie */
1010 u8
*end
= (u8
*) b
+ ntohs(b
->iph
.tot_len
);
1013 #ifdef IPCONFIG_DHCP
1014 if (ic_proto_enabled
& IC_USE_DHCP
) {
1015 __be32 server_id
= NONE
;
1019 while (ext
< end
&& *ext
!= 0xff) {
1021 if (*opt
== 0) /* Padding */
1027 case 53: /* Message type */
1031 case 54: /* Server ID (IP address) */
1033 memcpy(&server_id
, opt
+ 2, 4);
1038 #ifdef IPCONFIG_DEBUG
1039 printk("DHCP: Got message type %d\n", mt
);
1044 /* While in the process of accepting one offer,
1045 * ignore all others.
1047 if (ic_myaddr
!= NONE
)
1050 /* Let's accept that offer. */
1051 ic_myaddr
= b
->your_ip
;
1052 ic_servaddr
= server_id
;
1053 #ifdef IPCONFIG_DEBUG
1054 printk("DHCP: Offered address %pI4 by server %pI4\n",
1055 &ic_myaddr
, &ic_servaddr
);
1057 /* The DHCP indicated server address takes
1058 * precedence over the bootp header one if
1059 * they are different.
1061 if ((server_id
!= NONE
) &&
1062 (b
->server_ip
!= server_id
))
1063 b
->server_ip
= ic_servaddr
;
1067 if (memcmp(dev
->dev_addr
, b
->hw_addr
, dev
->addr_len
) != 0)
1074 /* Urque. Forget it*/
1080 ic_dhcp_msgtype
= mt
;
1083 #endif /* IPCONFIG_DHCP */
1086 while (ext
< end
&& *ext
!= 0xff) {
1088 if (*opt
== 0) /* Padding */
1092 ic_do_bootp_ext(opt
);
1096 /* We have a winner! */
1098 ic_myaddr
= b
->your_ip
;
1099 ic_servaddr
= b
->server_ip
;
1100 if (ic_gateway
== NONE
&& b
->relay_ip
)
1101 ic_gateway
= b
->relay_ip
;
1102 if (ic_nameservers
[0] == NONE
)
1103 ic_nameservers
[0] = ic_servaddr
;
1104 ic_got_reply
= IC_BOOTP
;
1107 /* Show's over. Nothing to see here. */
1108 spin_unlock(&ic_recv_lock
);
1111 /* Throw the packet out. */
1122 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1125 #ifdef IPCONFIG_DYNAMIC
1127 static int __init
ic_dynamic(void)
1130 struct ic_device
*d
;
1131 unsigned long start_jiffies
, timeout
, jiff
;
1132 int do_bootp
= ic_proto_have_if
& IC_BOOTP
;
1133 int do_rarp
= ic_proto_have_if
& IC_RARP
;
1136 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1137 * This routine gets only called when some pieces of information
1138 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1140 if (!ic_proto_enabled
) {
1141 printk(KERN_ERR
"IP-Config: Incomplete network configuration information.\n");
1145 #ifdef IPCONFIG_BOOTP
1146 if ((ic_proto_enabled
^ ic_proto_have_if
) & IC_BOOTP
)
1147 printk(KERN_ERR
"DHCP/BOOTP: No suitable device found.\n");
1149 #ifdef IPCONFIG_RARP
1150 if ((ic_proto_enabled
^ ic_proto_have_if
) & IC_RARP
)
1151 printk(KERN_ERR
"RARP: No suitable device found.\n");
1154 if (!ic_proto_have_if
)
1155 /* Error message already printed */
1161 #ifdef IPCONFIG_BOOTP
1165 #ifdef IPCONFIG_RARP
1171 * Send requests and wait, until we get an answer. This loop
1172 * seems to be a terrible waste of CPU time, but actually there is
1173 * only one process running at all, so we don't need to use any
1174 * scheduler functions.
1175 * [Actually we could now, but the nothing else running note still
1178 printk(KERN_NOTICE
"Sending %s%s%s requests .",
1180 ? ((ic_proto_enabled
& IC_USE_DHCP
) ? "DHCP" : "BOOTP") : "",
1181 (do_bootp
&& do_rarp
) ? " and " : "",
1182 do_rarp
? "RARP" : "");
1184 start_jiffies
= jiffies
;
1186 retries
= CONF_SEND_RETRIES
;
1187 get_random_bytes(&timeout
, sizeof(timeout
));
1188 timeout
= CONF_BASE_TIMEOUT
+ (timeout
% (unsigned) CONF_TIMEOUT_RANDOM
);
1190 /* Track the device we are configuring */
1191 ic_dev_xid
= d
->xid
;
1193 #ifdef IPCONFIG_BOOTP
1194 if (do_bootp
&& (d
->able
& IC_BOOTP
))
1195 ic_bootp_send_if(d
, jiffies
- start_jiffies
);
1197 #ifdef IPCONFIG_RARP
1198 if (do_rarp
&& (d
->able
& IC_RARP
))
1202 jiff
= jiffies
+ (d
->next
? CONF_INTER_TIMEOUT
: timeout
);
1203 while (time_before(jiffies
, jiff
) && !ic_got_reply
)
1204 schedule_timeout_uninterruptible(1);
1205 #ifdef IPCONFIG_DHCP
1206 /* DHCP isn't done until we get a DHCPACK. */
1207 if ((ic_got_reply
& IC_BOOTP
) &&
1208 (ic_proto_enabled
& IC_USE_DHCP
) &&
1209 ic_dhcp_msgtype
!= DHCPACK
) {
1211 printk(KERN_CONT
",");
1214 #endif /* IPCONFIG_DHCP */
1217 printk(KERN_CONT
" OK\n");
1225 printk(KERN_CONT
" timed out!\n");
1231 timeout
= timeout CONF_TIMEOUT_MULT
;
1232 if (timeout
> CONF_TIMEOUT_MAX
)
1233 timeout
= CONF_TIMEOUT_MAX
;
1235 printk(KERN_CONT
".");
1238 #ifdef IPCONFIG_BOOTP
1242 #ifdef IPCONFIG_RARP
1247 if (!ic_got_reply
) {
1252 printk("IP-Config: Got %s answer from %pI4, ",
1253 ((ic_got_reply
& IC_RARP
) ? "RARP"
1254 : (ic_proto_enabled
& IC_USE_DHCP
) ? "DHCP" : "BOOTP"),
1256 printk(KERN_CONT
"my address is %pI4\n", &ic_myaddr
);
1261 #endif /* IPCONFIG_DYNAMIC */
1263 #ifdef CONFIG_PROC_FS
1265 static int pnp_seq_show(struct seq_file
*seq
, void *v
)
1269 if (ic_proto_used
& IC_PROTO
)
1270 seq_printf(seq
, "#PROTO: %s\n",
1271 (ic_proto_used
& IC_RARP
) ? "RARP"
1272 : (ic_proto_used
& IC_USE_DHCP
) ? "DHCP" : "BOOTP");
1274 seq_puts(seq
, "#MANUAL\n");
1278 "domain %s\n", ic_domain
);
1279 for (i
= 0; i
< CONF_NAMESERVERS_MAX
; i
++) {
1280 if (ic_nameservers
[i
] != NONE
)
1281 seq_printf(seq
, "nameserver %pI4\n",
1282 &ic_nameservers
[i
]);
1284 if (ic_servaddr
!= NONE
)
1285 seq_printf(seq
, "bootserver %pI4\n",
1290 static int pnp_seq_open(struct inode
*indoe
, struct file
*file
)
1292 return single_open(file
, pnp_seq_show
, NULL
);
1295 static const struct file_operations pnp_seq_fops
= {
1296 .owner
= THIS_MODULE
,
1297 .open
= pnp_seq_open
,
1299 .llseek
= seq_lseek
,
1300 .release
= single_release
,
1302 #endif /* CONFIG_PROC_FS */
1305 * Extract IP address from the parameter string if needed. Note that we
1306 * need to have root_server_addr set _before_ IPConfig gets called as it
1309 __be32 __init
root_nfs_parse_addr(char *name
)
1316 while (octets
< 4) {
1317 while (*cp
>= '0' && *cp
<= '9')
1319 if (cp
== cq
|| cp
- cq
> 3)
1321 if (*cp
== '.' || octets
== 3)
1327 if (octets
== 4 && (*cp
== ':' || *cp
== '\0')) {
1330 addr
= in_aton(name
);
1331 memmove(name
, cp
, strlen(cp
) + 1);
1338 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1340 static int __init
wait_for_devices(void)
1344 for (i
= 0; i
< DEVICE_WAIT_MAX
; i
++) {
1345 struct net_device
*dev
;
1349 for_each_netdev(&init_net
, dev
) {
1350 if (ic_is_init_dev(dev
)) {
1364 * IP Autoconfig dispatcher.
1367 static int __init
ip_auto_config(void)
1370 #ifdef IPCONFIG_DYNAMIC
1371 int retries
= CONF_OPEN_RETRIES
;
1375 #ifdef CONFIG_PROC_FS
1376 proc_net_fops_create(&init_net
, "pnp", S_IRUGO
, &pnp_seq_fops
);
1377 #endif /* CONFIG_PROC_FS */
1382 DBG(("IP-Config: Entered.\n"));
1383 #ifdef IPCONFIG_DYNAMIC
1386 /* Wait for devices to appear */
1387 err
= wait_for_devices();
1391 /* Setup all network devices */
1392 err
= ic_open_devs();
1396 /* Give drivers a chance to settle */
1397 msleep(CONF_POST_OPEN
);
1400 * If the config information is insufficient (e.g., our IP address or
1401 * IP address of the boot server is missing or we have multiple network
1402 * interfaces and no default was set), use BOOTP or RARP to get the
1405 if (ic_myaddr
== NONE
||
1406 #ifdef CONFIG_ROOT_NFS
1407 (root_server_addr
== NONE
&&
1408 ic_servaddr
== NONE
&&
1409 ROOT_DEV
== Root_NFS
) ||
1411 ic_first_dev
->next
) {
1412 #ifdef IPCONFIG_DYNAMIC
1413 if (ic_dynamic() < 0) {
1417 * I don't know why, but sometimes the
1418 * eepro100 driver (at least) gets upset and
1419 * doesn't work the first time it's opened.
1420 * But then if you close it and reopen it, it
1421 * works just fine. So we need to try that at
1422 * least once before giving up.
1424 * Also, if the root will be NFS-mounted, we
1425 * have nowhere to go if DHCP fails. So we
1426 * just have to keep trying forever.
1430 #ifdef CONFIG_ROOT_NFS
1431 if (ROOT_DEV
== Root_NFS
) {
1433 "IP-Config: Retrying forever (NFS root)...\n");
1440 "IP-Config: Reopening network devices...\n");
1444 /* Oh, well. At least we tried. */
1445 printk(KERN_ERR
"IP-Config: Auto-configuration of network failed.\n");
1448 #else /* !DYNAMIC */
1449 printk(KERN_ERR
"IP-Config: Incomplete network configuration information.\n");
1452 #endif /* IPCONFIG_DYNAMIC */
1454 /* Device selected manually or only one device -> use it */
1455 ic_dev
= ic_first_dev
->dev
;
1458 addr
= root_nfs_parse_addr(root_server_path
);
1459 if (root_server_addr
== NONE
)
1460 root_server_addr
= addr
;
1463 * Use defaults wherever applicable.
1465 if (ic_defaults() < 0)
1469 * Close all network devices except the device we've
1470 * autoconfigured and set up routes.
1473 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1477 * Record which protocol was actually used.
1479 #ifdef IPCONFIG_DYNAMIC
1480 ic_proto_used
= ic_got_reply
| (ic_proto_enabled
& IC_USE_DHCP
);
1483 #ifndef IPCONFIG_SILENT
1485 * Clue in the operator.
1487 printk("IP-Config: Complete:\n");
1488 printk(" device=%s", ic_dev
->name
);
1489 printk(KERN_CONT
", addr=%pI4", &ic_myaddr
);
1490 printk(KERN_CONT
", mask=%pI4", &ic_netmask
);
1491 printk(KERN_CONT
", gw=%pI4", &ic_gateway
);
1492 printk(KERN_CONT
",\n host=%s, domain=%s, nis-domain=%s",
1493 utsname()->nodename
, ic_domain
, utsname()->domainname
);
1494 printk(KERN_CONT
",\n bootserver=%pI4", &ic_servaddr
);
1495 printk(KERN_CONT
", rootserver=%pI4", &root_server_addr
);
1496 printk(KERN_CONT
", rootpath=%s", root_server_path
);
1498 printk(KERN_CONT
", mtu=%d", ic_dev_mtu
);
1499 printk(KERN_CONT
"\n");
1500 #endif /* !SILENT */
1505 late_initcall(ip_auto_config
);
1509 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1510 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1512 static int __init
ic_proto_name(char *name
)
1514 if (!strcmp(name
, "on") || !strcmp(name
, "any")) {
1517 if (!strcmp(name
, "off") || !strcmp(name
, "none")) {
1520 #ifdef CONFIG_IP_PNP_DHCP
1521 else if (!strcmp(name
, "dhcp")) {
1522 ic_proto_enabled
&= ~IC_RARP
;
1526 #ifdef CONFIG_IP_PNP_BOOTP
1527 else if (!strcmp(name
, "bootp")) {
1528 ic_proto_enabled
&= ~(IC_RARP
| IC_USE_DHCP
);
1532 #ifdef CONFIG_IP_PNP_RARP
1533 else if (!strcmp(name
, "rarp")) {
1534 ic_proto_enabled
&= ~(IC_BOOTP
| IC_USE_DHCP
);
1538 #ifdef IPCONFIG_DYNAMIC
1539 else if (!strcmp(name
, "both")) {
1540 ic_proto_enabled
&= ~IC_USE_DHCP
; /* backward compat :-( */
1547 static int __init
ip_auto_config_setup(char *addrs
)
1552 ic_set_manually
= 1;
1556 * If any dhcp, bootp etc options are set, leave autoconfig on
1557 * and skip the below static IP processing.
1559 if (ic_proto_name(addrs
))
1562 /* If no static IP is given, turn off autoconfig and bail. */
1564 strcmp(addrs
, "off") == 0 ||
1565 strcmp(addrs
, "none") == 0) {
1570 /* Parse string for static IP assignment. */
1573 if ((cp
= strchr(ip
, ':')))
1575 if (strlen(ip
) > 0) {
1576 DBG(("IP-Config: Parameter #%d: `%s'\n", num
, ip
));
1579 if ((ic_myaddr
= in_aton(ip
)) == ANY
)
1583 if ((ic_servaddr
= in_aton(ip
)) == ANY
)
1587 if ((ic_gateway
= in_aton(ip
)) == ANY
)
1591 if ((ic_netmask
= in_aton(ip
)) == ANY
)
1595 if ((dp
= strchr(ip
, '.'))) {
1597 strlcpy(utsname()->domainname
, dp
,
1598 sizeof(utsname()->domainname
));
1600 strlcpy(utsname()->nodename
, ip
,
1601 sizeof(utsname()->nodename
));
1602 ic_host_name_set
= 1;
1605 strlcpy(user_dev_name
, ip
, sizeof(user_dev_name
));
1608 if (ic_proto_name(ip
) == 0 &&
1609 ic_myaddr
== NONE
) {
1622 static int __init
nfsaddrs_config_setup(char *addrs
)
1624 return ip_auto_config_setup(addrs
);
1627 static int __init
vendor_class_identifier_setup(char *addrs
)
1629 if (strlcpy(vendor_class_identifier
, addrs
,
1630 sizeof(vendor_class_identifier
))
1631 >= sizeof(vendor_class_identifier
))
1632 printk(KERN_WARNING
"DHCP: vendorclass too long, truncated to \"%s\"",
1633 vendor_class_identifier
);
1637 __setup("ip=", ip_auto_config_setup
);
1638 __setup("nfsaddrs=", nfsaddrs_config_setup
);
1639 __setup("dhcpclass=", vendor_class_identifier_setup
);