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SubjectPATCH: boot-time DHCP
I was surprised to find that the plug-and-play network configuration
supports BOOTP and RARP(?!) but not DHCP. So I added it myself.

As a bonus, I threw in a new /proc file: "/proc/net/pnp".
If it has any non-comment lines, then it's suitable for use
as your /etc/resolv.conf. :-)

The first version of the patch is enclosed.

Note that DHCP leases require periodic refreshes. So this patch is
*NOT* enough for long-term operation: You still need the DHCP client
from user space. But this patch will get you booting, even if your
root filesystem is NFS-mounted.

Alan, I'm not quite done with the /proc features, so please do NOT
consider this for 2.1.14.

Shar and enjoy!

PS: I'd appreciate some help with some latency issues. I invite
anyone who knows the kernel network and scheduler code well to
volunteer with some explanations. Thanks.

Index: Documentation/Configure.help
***************
*** 2444,2450 ****
the boot ROM of your network card was designed for booting Linux and
does BOOTP itself, providing all necessary information on the kernel
! command line, you can say N here. If unsure, say Y. Note that if you
! want to use BOOTP, a BOOTP server must be operating on your network.
! Read Documentation/nfsroot.txt for details.

RARP support
--- 2444,2467 ----
the boot ROM of your network card was designed for booting Linux and
does BOOTP itself, providing all necessary information on the kernel
! command line, you can say N here.
!
! If unsure, say Y. Note that if you want to use BOOTP, a BOOTP server
! must be operating on your network. Read Documentation/nfsroot.txt
! for details.
!
! DHCP support
! CONFIG_IP_PNP_DHCP
! If you want your Linux box to mount its whole root filesystem (the
! one containing the directory /) from some other computer over the
! net via NFS and you want the IP address of your computer to be
! discovered automatically at boot time using the DHCP protocol (a
! special protocol designed for doing this job), say Y here. In case
! the boot ROM of your network card was designed for booting Linux and
! does DHCP itself, providing all necessary information on the kernel
! command line, you can say N here.
!
! If unsure, say Y. Note that if you want to use DHCP, a DHCP server
! must be operating on your network. Read Documentation/nfsroot.txt
! for details.

RARP support

Index: include/linux/proc_fs.h
***************
*** 148,151 ****
--- 148,152 ----
PROC_NET_AT_AARP,
PROC_NET_BRIDGE,
+ PROC_NET_PNP,
PROC_NET_LAST
};

Index: include/net/ipconfig.h
***************
*** 7,21 ****
*/

! extern __u32 root_server_addr;
! extern u8 root_server_path[];
! extern u32 ic_myaddr;
! extern u32 ic_servaddr;
! extern u32 ic_gateway;
! extern u32 ic_netmask;
! extern int ic_enable;
! extern int ic_host_name_set;
! extern int ic_set_manually;
! extern int ic_proto_enabled;

! #define IC_BOOTP 1
! #define IC_RARP 2
--- 7,35 ----
*/

! /* The following are initdata: */

! extern int ic_enable; /* Enable or disable the whole shebang */
!
! extern int ic_proto_enabled; /* Protocols enabled (see IC_xxx) */
! extern int ic_host_name_set; /* Host name set by ipconfig? */
!
! extern u32 ic_myaddr; /* My IP address */
! extern u32 ic_netmask; /* Netmask for local subnet */
! extern u32 ic_gateway; /* Gateway IP address */
!
! extern u32 ic_servaddr; /* Boot server IP address */
!
! extern u32 root_server_addr; /* Address of NFS server */
! extern u8 root_server_path[]; /* Path to mount as root */
!
! /* The following are persistent (not initdata): */
!
! extern int ic_proto_used; /* Protocol used, if any */
! extern u32 ic_nameserver; /* DNS server IP address */
! extern u8 ic_domain[]; /* DNS (not NIS) domain name */
!
! /* bits in ic_proto_{enabled,used} */
! #define IC_PROTO 0xFF /* Protocols mask: */
! #define IC_BOOTP 0x01 /* BOOTP (or DHCP, see below) */
! #define IC_RARP 0x02 /* RARP */
! #define IC_USE_DHCP 0x100 /* If on, use DHCP instead of BOOTP */

Index: Documentation/nfsroot.txt
***************
*** 25,29 ****
in this case. The configuration script will then ask you whether
you want to use nfsroot, and if yes what kind of auto configuration
! system you want to use. Selecting both BOOTP and RARP is safe.


--- 25,29 ----
in this case. The configuration script will then ask you whether
you want to use nfsroot, and if yes what kind of auto configuration
! system you want to use. Selecting both DHCP/BOOTP and RARP is safe.


***************
*** 89,100 ****
assumed to be empty, and the defaults mentioned below apply. In general
this means that the kernel tries to configure everything using both
! RARP and BOOTP (depending on what has been enabled during kernel confi-
! guration, and if both what protocol answer got in first).

<client-ip> IP address of the client. If empty, the address will either
! be determined by RARP or BOOTP. What protocol is used de-
! pends on what has been enabled during kernel configuration
and on the <autoconf> parameter. If this parameter is not
! empty, neither RARP nor BOOTP will be used.

<server-ip> IP address of the NFS server. If RARP is used to determine
--- 89,100 ----
assumed to be empty, and the defaults mentioned below apply. In general
this means that the kernel tries to configure everything using both
! RARP and DHCP/BOOTP (depending on what has been enabled during kernel
! configuration, and if both what protocol answer got in first).

<client-ip> IP address of the client. If empty, the address will either
! be determined by RARP or DHCP/BOOTP. What protocol is used
! depends on what has been enabled during kernel configuration
and on the <autoconf> parameter. If this parameter is not
! empty, neither RARP nor DHCP/BOOTP will be used.

<server-ip> IP address of the NFS server. If RARP is used to determine
***************
*** 104,121 ****
here (or leave it blank), and specify your NFS server in
the `nfsroot' parameter (see above). If this entry is blank
! the address of the server is used which answered the RARP
! or BOOTP request.

<gw-ip> IP address of a gateway if the server is on a different
subnet. If this entry is empty no gateway is used and the
! server is assumed to be on the local network, unless a
! value has been received by BOOTP.

<netmask> Netmask for local network interface. If this is empty,
the netmask is derived from the client IP address assuming
! classful addressing, unless overridden in BOOTP reply.

<hostname> Name of the client. If empty, the client IP address is
! used in ASCII notation, or the value received by BOOTP.

<device> Name of network device to use. If this is empty, all
--- 104,123 ----
here (or leave it blank), and specify your NFS server in
the `nfsroot' parameter (see above). If this entry is blank
! the address of the server is used which answered the RARP,
! or the server address in the DHCP/BOOTP reply. (Note that
! this may *not* be the DHCP/BOOTP server itself.)

<gw-ip> IP address of a gateway if the server is on a different
subnet. If this entry is empty no gateway is used and the
! server is assumed to be on the local network, unless
! overridden by DHCP/BOOTP reply.

<netmask> Netmask for local network interface. If this is empty,
the netmask is derived from the client IP address assuming
! classful addressing, unless overridden by DHCP/BOOTP reply.

<hostname> Name of the client. If empty, the client IP address is
! used in ASCII notation, unless overridden by DHCP/BOOTP
! reply.

<device> Name of network device to use. If this is empty, all
***************
*** 124,132 ****
only one device, you can safely leave this blank.

! <autoconf> Method to use for autoconfiguration. If this is either
! 'rarp' or 'bootp', the specified protocol is used.
! If the value is 'both' or empty, both protocols are used
! so far as they have been enabled during kernel configura-
! tion. 'off' means no autoconfiguration.

The <autoconf> parameter can appear alone as the value to the `ip'
--- 126,136 ----
only one device, you can safely leave this blank.

! <autoconf> Method to use for autoconfiguration. If this is 'dhcp',
! 'bootp', or 'rarp', the specified protocol is used. If
! the value is 'both' or empty, then both BOOTP and RARP are
! used so far as they are configured into the kernel. (For
! backward compatibility, DHCP will not be used in this
! case, unless BOOTP is not configured.) If the value is
! 'off', no autoconfiguration of any kind occurs.

The <autoconf> parameter can appear alone as the value to the `ip'
***************
*** 162,171 ****
You can then remove the dummy device /dev/boot255 again. There
is no real device available for it.
The other two kernel command line parameters cannot be substi-
! tuted with rdev. Therefore, using this method the kernel will
! by default use RARP and/or BOOTP, and if it gets an answer via
RARP will mount the directory /tftpboot/<client-ip>/ as its
! root. If it got a BOOTP answer the directory name in that answer
! is used.


--- 166,176 ----
You can then remove the dummy device /dev/boot255 again. There
is no real device available for it.
+
The other two kernel command line parameters cannot be substi-
! tuted with rdev. Therefore, using this method the kernel will by
! default use DHCP/BOOTP and/or RARP, and if it gets an answer via
RARP will mount the directory /tftpboot/<client-ip>/ as its
! root. If it gets a DHCP/BOOTP answer the directory name in that
! answer is used.



Index: net/ipv4/Config.in
***************
*** 18,21 ****
--- 18,22 ----
bool 'IP: kernel level autoconfiguration' CONFIG_IP_PNP
if [ "$CONFIG_IP_PNP" = "y" ]; then
+ bool ' DHCP support' CONFIG_IP_PNP_DHCP
bool ' BOOTP support' CONFIG_IP_PNP_BOOTP
bool ' RARP support' CONFIG_IP_PNP_RARP

Index: net/ipv4/ipconfig.c
***************
*** 2,7 ****
* $Id: ipconfig.c,v 1.20.2.1 1999/06/28 11:33:27 davem Exp $
*
! * Automatic Configuration of IP -- use BOOTP or RARP or user-supplied
! * information to configure own IP address and routes.
*
* Copyright (C) 1996--1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
--- 2,7 ----
* $Id: ipconfig.c,v 1.20.2.1 1999/06/28 11:33:27 davem Exp $
*
! * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
! * user-supplied information to configure own IP address and routes.
*
* Copyright (C) 1996--1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
***************
*** 13,16 ****
--- 13,20 ----
* of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
* -- MJ, December 1998
+ *
+ * DHCP support added. To users this looks like a whole separate
+ * protocol, but we know it's just a bag on the side of BOOTP.
+ * -- Chip Salzenberg <chip@valinux.com>, Dec. 1999
*/

***************
*** 21,26 ****
#include <linux/sched.h>
#include <linux/random.h>
- #include <linux/init.h>
#include <linux/utsname.h>
#include <linux/in.h>
#include <linux/if.h>
--- 25,31 ----
#include <linux/sched.h>
#include <linux/random.h>
#include <linux/utsname.h>
+ #include <linux/proc_fs.h>
+ #include <linux/init.h>
#include <linux/in.h>
#include <linux/if.h>
***************
*** 50,54 ****
#endif

! /* Define the timeout for waiting for a RARP/BOOTP reply */
#define CONF_BASE_TIMEOUT (HZ*5) /* Initial timeout: 5 seconds */
#define CONF_RETRIES 10 /* 10 retries */
--- 55,72 ----
#endif

! #if defined(CONFIG_IP_PNP_DHCP)
! #define IPCONFIG_DHCP
! #endif
! #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
! #define IPCONFIG_BOOTP
! #endif
! #if defined(CONFIG_IP_PNP_RARP)
! #define IPCONFIG_RARP
! #endif
! #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
! #define IPCONFIG_DYNAMIC
! #endif
!
! /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
#define CONF_BASE_TIMEOUT (HZ*5) /* Initial timeout: 5 seconds */
#define CONF_RETRIES 10 /* 10 retries */
***************
*** 57,95 ****
#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */

- /* IP configuration */
- static char user_dev_name[IFNAMSIZ] __initdata = { 0, };/* Name of user-selected boot device */
- u32 ic_myaddr __initdata = INADDR_NONE; /* My IP address */
- u32 ic_servaddr __initdata = INADDR_NONE; /* Server IP address */
- u32 ic_gateway __initdata = INADDR_NONE; /* Gateway IP address */
- u32 ic_netmask __initdata = INADDR_NONE; /* Netmask for local subnet */
- int ic_enable __initdata = 1; /* Automatic IP configuration enabled */
- int ic_host_name_set __initdata = 0; /* Host name configured manually */
- int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
- u32 root_server_addr __initdata = INADDR_NONE; /* Address of boot server */
- u8 root_server_path[256] __initdata = { 0, }; /* Path to mount as root */

! #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)

! #define CONFIG_IP_PNP_DYNAMIC

! static int ic_proto_enabled __initdata = 0 /* Protocols enabled */
! #ifdef CONFIG_IP_PNP_BOOTP
| IC_BOOTP
#endif
! #ifdef CONFIG_IP_PNP_RARP
| IC_RARP
#endif
;
- static int ic_got_reply __initdata = 0; /* Protocol(s) we got reply from */

! #else

! static int ic_proto_enabled __initdata = 0;

! #endif

static int ic_proto_have_if __initdata = 0;

/*
* Network devices
--- 75,133 ----
#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */


! /*
! * Public IP configuration
! */

! int ic_enable __initdata = 1; /* Automatic IP cfg enabled? */

! /* Protocol choice */
! static int ic_proto_enabled __initdata = 0
! #ifdef IPCONFIG_BOOTP
| IC_BOOTP
#endif
! #ifdef CONFIG_IP_PNP_DHCP
! | IC_USE_DHCP
! #endif
! #ifdef IPCONFIG_RARP
| IC_RARP
#endif
;

! int ic_host_name_set __initdata = 0; /* Host name set by us? */

! u32 ic_myaddr __initdata = INADDR_NONE; /* My IP address */
! u32 ic_netmask __initdata = INADDR_NONE; /* Netmask for local subnet */
! u32 ic_gateway __initdata = INADDR_NONE; /* Gateway IP address */

! u32 ic_servaddr __initdata = INADDR_NONE; /* Boot server IP address */

+ u32 root_server_addr __initdata = INADDR_NONE; /* Address of NFS server */
+ u8 root_server_path[256] __initdata = { 0, }; /* Path to mount as root */
+
+ /* Persistent data: */
+
+ int ic_proto_used = 0; /* Protocol used, if any */
+ u32 ic_nameserver = INADDR_NONE; /* DNS Server IP address */
+ u8 ic_domain[64] = { 0, }; /* DNS (not NIS) domain name */
+
+ /*
+ * Private state.
+ */
+
+ /* Name of user-selected boot device */
+ static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
+
+ /* Protocols supported by available interfaces */
static int ic_proto_have_if __initdata = 0;

+ #ifdef IPCONFIG_DYNAMIC
+ static int ic_got_reply = 0; /* Protocol(s) we got reply from */
+ #endif
+ #ifdef IPCONFIG_DHCP
+ static int ic_dhcp_msgtype __initdata = 0; /* Last incoming msg type */
+ #endif
+
+
/*
* Network devices
*************** static int __init ic_open_devs(void)
*** 122,126 ****
able |= IC_BOOTP;
else
! printk(KERN_WARNING "BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
if (!(dev->flags & IFF_NOARP))
able |= IC_RARP;
--- 160,164 ----
able |= IC_BOOTP;
else
! printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
if (!(dev->flags & IFF_NOARP))
able |= IC_RARP;
*************** static int __init ic_defaults(void)
*** 300,304 ****
*/

! #ifdef CONFIG_IP_PNP_RARP

static int ic_rarp_recv(struct sk_buff *skb, struct device *dev, struct packet_type *pt);
--- 338,342 ----
*/

! #ifdef IPCONFIG_RARP

static int ic_rarp_recv(struct sk_buff *skb, struct device *dev, struct packet_type *pt);
*************** static void __init ic_rarp_send(void)
*** 400,407 ****

/*
! * BOOTP support.
*/

! #ifdef CONFIG_IP_PNP_BOOTP

struct bootp_pkt { /* BOOTP packet format */
--- 438,445 ----

/*
! * DHCP/BOOTP support.
*/

! #ifdef IPCONFIG_BOOTP

struct bootp_pkt { /* BOOTP packet format */
*************** struct bootp_pkt { /* BOOTP packet form
*** 417,434 ****
u32 client_ip; /* Client's IP address if known */
u32 your_ip; /* Assigned IP address */
! u32 server_ip; /* Server's IP address */
u32 relay_ip; /* IP address of BOOTP relay */
u8 hw_addr[16]; /* Client's HW address */
! u8 serv_name[64]; /* Server host name */
! u8 boot_file[128]; /* Name of boot file */
! u8 vendor_area[128]; /* Area for extensions */
};

! #define BOOTP_REQUEST 1
! #define BOOTP_REPLY 2

static u32 ic_bootp_xid;

! static int ic_bootp_recv(struct sk_buff *skb, struct device *dev, struct packet_type *pt);

static struct packet_type bootp_packet_type __initdata = {
--- 455,484 ----
u32 client_ip; /* Client's IP address if known */
u32 your_ip; /* Assigned IP address */
! u32 server_ip; /* (Next, e.g. NFS) Server's IP address */
u32 relay_ip; /* IP address of BOOTP relay */
u8 hw_addr[16]; /* Client's HW address */
! char server_name[64]; /* Server host name */
! char boot_file[128]; /* Name of boot file */
! u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
};

! /* packet ops */
! #define BOOTP_REQUEST 1
! #define BOOTP_REPLY 2
!
! /* DHCP message types */
! #define DHCPDISCOVER 1
! #define DHCPOFFER 2
! #define DHCPREQUEST 3
! #define DHCPDECLINE 4
! #define DHCPACK 5
! #define DHCPNAK 6
! #define DHCPRELEASE 7
! #define DHCPINFORM 8

static u32 ic_bootp_xid;

! static int ic_bootp_recv(struct sk_buff *skb, struct device *dev,
! struct packet_type *pt);

static struct packet_type bootp_packet_type __initdata = {
*************** static struct packet_type bootp_packet_t
*** 442,453 ****

/*
! * Initialize BOOTP extension fields in the request.
*/
! static void __init ic_bootp_init_ext(u8 *e)
{
! *e++ = 99; /* RFC1048 Magic Cookie */
! *e++ = 130;
! *e++ = 83;
! *e++ = 99;
*e++ = 1; /* Subnet mask request */
*e++ = 4;
--- 492,556 ----

/*
! * Initialize DHCP/BOOTP extension fields in the request.
*/
!
! static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
!
! #ifdef IPCONFIG_DHCP
!
! static void __init
! ic_dhcp_init_options(u8 *options)
{
! u8 msgtype = ((ic_dhcp_msgtype == DHCPOFFER)
! ? DHCPREQUEST : DHCPDISCOVER);
! u8 *e = options;
!
! #ifdef IPCONFIG_DEBUG
! printk("DHCP: Sending message type %d\n", msgtype);
! #endif
!
! memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
! e += 4;
!
! *e++ = 53; /* DHCP message type */
! *e++ = 1;
! *e++ = msgtype;
!
! if (msgtype == DHCPREQUEST) {
! *e++ = 50; /* Requested IP address */
! *e++ = 4;
! memcpy(e, &ic_myaddr, 4);
! e += 4;
! }
!
! /* always? */
! {
! static const u8 ic_req_params[] = {
! 1, /* Subnet mask */
! 3, /* Default gateway */
! 6, /* DNS server */
! 12, /* Host name */
! 15, /* Domain name */
! 17, /* Boot path */
! 40, /* NIS domain name */
! };
!
! *e++ = 55; /* Parameter request list */
! *e++ = sizeof(ic_req_params);
! memcpy(e, ic_req_params, sizeof(ic_req_params));
! e += sizeof(ic_req_params);
! }
!
! *e++ = 255; /* End of the list */
! }
!
! #endif /* IPCONFIG_DHCP */
!
! static void __init
! ic_bootp_init_ext(u8 *ext)
! {
! u8 *e = ext;
! memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
! e += 4;
*e++ = 1; /* Subnet mask request */
*e++ = 4;
*************** static void __init ic_bootp_init_ext(u8
*** 456,459 ****
--- 559,565 ----
*e++ = 4;
e += 4;
+ *e++ = 5; /* Name server reqeust */
+ *e++ = 8;
+ e += 8;
*e++ = 12; /* Host name request */
*e++ = 32;
*************** static void __init ic_bootp_init_ext(u8
*** 463,479 ****
e += 32;
*e++ = 17; /* Boot path */
! *e++ = 32;
! e += 32;
! *e = 255; /* End of the list */
}


/*
! * Initialize the BOOTP mechanism.
*/
! static inline void ic_bootp_init(void)
{
get_random_bytes(&ic_bootp_xid, sizeof(u32));
! DBG(("BOOTP: XID=%08x\n", ic_bootp_xid));
dev_add_pack(&bootp_packet_type);
}
--- 569,586 ----
e += 32;
*e++ = 17; /* Boot path */
! *e++ = 40;
! e += 40;
! *e++ = 255; /* End of the list */
}


/*
! * Initialize the DHCP/BOOTP mechanism.
*/
! static inline void
! ic_bootp_init(void)
{
get_random_bytes(&ic_bootp_xid, sizeof(u32));
! DBG(("DHCP/BOOTP: XID=%08x\n", ic_bootp_xid));
dev_add_pack(&bootp_packet_type);
}
*************** static inline void ic_bootp_init(void)
*** 481,487 ****

/*
! * BOOTP cleanup.
*/
! static inline void ic_bootp_cleanup(void)
{
dev_remove_pack(&bootp_packet_type);
--- 588,595 ----

/*
! * DHCP/BOOTP cleanup.
*/
! static inline void
! ic_bootp_cleanup(void)
{
dev_remove_pack(&bootp_packet_type);
*************** static inline void ic_bootp_cleanup(void
*** 490,496 ****

/*
! * Send BOOTP request to single interface.
*/
! static void __init ic_bootp_send_if(struct ic_device *d, u32 jiffies)
{
struct device *dev = d->dev;
--- 598,605 ----

/*
! * Send DHCP/BOOTP request to single interface.
*/
! static void __init
! ic_bootp_send_if(struct ic_device *d, u32 jiffies)
{
struct device *dev = d->dev;
*************** static void __init ic_bootp_send_if(stru
*** 525,536 ****
/* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */

! /* Construct BOOTP header */
b->op = BOOTP_REQUEST;
b->htype = dev->type;
b->hlen = dev->addr_len;
memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
b->secs = htons(jiffies / HZ);
b->xid = ic_bootp_xid;
! ic_bootp_init_ext(b->vendor_area);

/* Chain packet down the line... */
--- 634,654 ----
/* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */

! /* Construct DHCP/BOOTP header */
b->op = BOOTP_REQUEST;
b->htype = dev->type;
b->hlen = dev->addr_len;
+ b->your_ip = INADDR_NONE;
+ b->server_ip = INADDR_NONE;
memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
b->secs = htons(jiffies / HZ);
b->xid = ic_bootp_xid;
!
! /* add DHCP options or BOOTP extensions */
! #ifdef IPCONFIG_DHCP
! if (ic_proto_enabled & IC_USE_DHCP)
! ic_dhcp_init_options(b->exten);
! else
! #endif
! ic_bootp_init_ext(b->exten);

/* Chain packet down the line... */
*************** static void __init ic_bootp_send_if(stru
*** 545,549 ****

/*
! * Send BOOTP requests to all interfaces.
*/
static void __init ic_bootp_send(u32 jiffies)
--- 663,667 ----

/*
! * Send DHCP/BOOTP requests to all interfaces.
*/
static void __init ic_bootp_send(u32 jiffies)
*************** static void __init ic_bootp_send(u32 jif
*** 551,557 ****
struct ic_device *d;

! for(d=ic_first_dev; d; d=d->next)
if (d->able & IC_BOOTP)
ic_bootp_send_if(d, jiffies);
}

--- 669,676 ----
struct ic_device *d;

! for(d = ic_first_dev; d; d=d->next) {
if (d->able & IC_BOOTP)
ic_bootp_send_if(d, jiffies);
+ }
}

*************** static int __init ic_bootp_string(char *
*** 566,577 ****
if (len > max-1)
len = max-1;
! strncpy(dest, src, len);
dest[len] = '\0';
return 1;
}

/*
! * Process BOOTP extension.
*/
static void __init ic_do_bootp_ext(u8 *ext)
--- 685,695 ----
if (len > max-1)
len = max-1;
! memcpy(dest, src, len);
dest[len] = '\0';
return 1;
}

/*
! * Process BOOTP extensions.
*/
static void __init ic_do_bootp_ext(u8 *ext)
*************** static void __init ic_do_bootp_ext(u8 *e
*** 580,584 ****
u8 *c;

! printk("BOOTP: Got extension %02x",*ext);
for(c=ext+2; c<ext+2+ext[1]; c++)
printk(" %02x", *c);
--- 698,702 ----
u8 *c;

! printk("DHCP/BOOTP: Got extension %d:",*ext);
for(c=ext+2; c<ext+2+ext[1]; c++)
printk(" %02x", *c);
*************** static void __init ic_do_bootp_ext(u8 *e
*** 595,604 ****
memcpy(&ic_gateway, ext+1, 4);
break;
case 12: /* Host name */
ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
ic_host_name_set = 1;
break;
! case 40: /* NIS Domain name */
! ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
break;
case 17: /* Root path */
--- 713,726 ----
memcpy(&ic_gateway, ext+1, 4);
break;
+ case 6: /* DNS server */
+ if (ic_nameserver == INADDR_NONE)
+ memcpy(&ic_nameserver, ext+1, 4);
+ break;
case 12: /* Host name */
ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
ic_host_name_set = 1;
break;
! case 15: /* Domain name (DNS) */
! ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
break;
case 17: /* Root path */
*************** static void __init ic_do_bootp_ext(u8 *e
*** 606,609 ****
--- 728,734 ----
ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
break;
+ case 40: /* NIS domain name (_not_ DNS) */
+ ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
+ break;
}
}
*************** static int __init ic_bootp_recv(struct s
*** 638,642 ****
/* Fragments are not supported */
if (h->frag_off & htons(IP_OFFSET|IP_MF)) {
! printk(KERN_ERR "BOOTP: Ignoring fragmented reply.\n");
goto drop;
}
--- 763,767 ----
/* Fragments are not supported */
if (h->frag_off & htons(IP_OFFSET|IP_MF)) {
! printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented reply.\n");
goto drop;
}
*************** static int __init ic_bootp_recv(struct s
*** 651,681 ****
}

- /* Extract basic fields */
- ic_myaddr = b->your_ip;
- ic_servaddr = b->server_ip;
ic_got_reply = IC_BOOTP;
ic_dev = dev;

/* Parse extensions */
! if (b->vendor_area[0] == 99 && /* Check magic cookie */
! b->vendor_area[1] == 130 &&
! b->vendor_area[2] == 83 &&
! b->vendor_area[3] == 99) {
! u8 *ext = &b->vendor_area[4];
u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
while (ext < end && *ext != 0xff) {
! if (*ext == 0) /* Padding */
! ext++;
! else {
! u8 *opt = ext;
! ext += ext[1] + 2;
! if (ext <= end)
! ic_do_bootp_ext(opt);
}
}
}

if (ic_gateway == INADDR_NONE && b->relay_ip)
ic_gateway = b->relay_ip;

drop:
--- 776,857 ----
}

ic_got_reply = IC_BOOTP;
ic_dev = dev;

/* Parse extensions */
! if (!memcmp(b->exten, ic_bootp_cookie, 4)) {
u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
+ u8 *ext;
+
+ #ifdef IPCONFIG_DHCP
+
+ u32 server_id = INADDR_NONE;
+ ic_dhcp_msgtype = 0;
+
+ ext = &b->exten[4];
while (ext < end && *ext != 0xff) {
! u8 *opt = ext++;
! if (*opt == 0) /* Padding */
! continue;
! ext += *ext + 1;
! if (ext >= end)
! break;
! switch (*opt) {
! case 53: /* Message type */
! if (opt[1])
! ic_dhcp_msgtype = opt[2];
! break;
! case 54: /* Server ID (IP address) */
! if (opt[1] >= 4)
! memcpy(&server_id, opt + 2, 4);
! break;
}
}
+
+ #ifdef IPCONFIG_DEBUG
+ printk("DHCP: Got message type %d\n", ic_dhcp_msgtype);
+ #endif
+
+ switch (ic_dhcp_msgtype) {
+ case DHCPOFFER:
+ /* Let's accept that offer. */
+ ic_myaddr = b->your_ip;
+ ic_servaddr = server_id;
+ #ifdef IPCONFIG_DEBUG
+ printk("DHCP: Offered address %s", in_ntoa(ic_myaddr));
+ printk(" by server %s\n", in_ntoa(ic_servaddr));
+ #endif
+ goto drop;
+
+ case DHCPACK:
+ /* Yeah! */
+ break;
+
+ default:
+ /* Urque. Forget it*/
+ ic_myaddr = INADDR_NONE;
+ ic_servaddr = INADDR_NONE;
+ goto drop;
+ }
+
+ #endif /* IPCONFIG_DHCP */
+
+ ext = &b->exten[4];
+ while (ext < end && *ext != 0xff) {
+ u8 *opt = ext++;
+ if (*opt == 0) /* Padding */
+ continue;
+ ext += *ext + 1;
+ if (ext < end)
+ ic_do_bootp_ext(opt);
+ }
}

+ ic_myaddr = b->your_ip;
+ ic_servaddr = b->server_ip;
if (ic_gateway == INADDR_NONE && b->relay_ip)
ic_gateway = b->relay_ip;
+ if (ic_nameserver == INADDR_NONE)
+ ic_nameserver = ic_servaddr;

drop:
*************** drop:
*** 689,696 ****

/*
! * Dynamic IP configuration -- BOOTP and RARP.
*/

! #ifdef CONFIG_IP_PNP_DYNAMIC

static int __init ic_dynamic(void)
--- 865,872 ----

/*
! * Dynamic IP configuration -- DHCP, BOOTP, RARP.
*/

! #ifdef IPCONFIG_DYNAMIC

static int __init ic_dynamic(void)
*************** static int __init ic_dynamic(void)
*** 699,710 ****
unsigned long timeout, jiff;
unsigned long start_jiffies;
- int do_rarp = ic_proto_have_if & IC_RARP;
int do_bootp = ic_proto_have_if & IC_BOOTP;

/*
! * If neither BOOTP nor RARP was selected, return with an error. This
! * routine gets only called when some pieces of information are mis-
! * sing, and without BOOTP and RARP we are not able to get that in-
! * formation.
*/
if (!ic_proto_enabled) {
--- 875,885 ----
unsigned long timeout, jiff;
unsigned long start_jiffies;
int do_bootp = ic_proto_have_if & IC_BOOTP;
+ int do_rarp = ic_proto_have_if & IC_RARP;

/*
! * If none of DHCP/BOOTP/RARP was selected, return with an error.
! * This routine gets only called when some pieces of information
! * are missing, and without BOOTP and RARP we are unable to get it.
*/
if (!ic_proto_enabled) {
*************** static int __init ic_dynamic(void)
*** 713,722 ****
}

! #ifdef CONFIG_IP_PNP_BOOTP
if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
! printk(KERN_ERR "BOOTP: No suitable device found.\n");
#endif
!
! #ifdef CONFIG_IP_PNP_RARP
if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
printk(KERN_ERR "RARP: No suitable device found.\n");
--- 888,896 ----
}

! #ifdef IPCONFIG_BOOTP
if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
! printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
#endif
! #ifdef IPCONFIG_RARP
if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
printk(KERN_ERR "RARP: No suitable device found.\n");
*************** static int __init ic_dynamic(void)
*** 728,741 ****

/*
! * Setup RARP and BOOTP protocols
*/
! #ifdef CONFIG_IP_PNP_RARP
! if (do_rarp)
! ic_rarp_init();
! #endif
! #ifdef CONFIG_IP_PNP_BOOTP
if (do_bootp)
ic_bootp_init();
#endif

/*
--- 902,915 ----

/*
! * Setup protocols
*/
! #ifdef IPCONFIG_BOOTP
if (do_bootp)
ic_bootp_init();
#endif
+ #ifdef IPCONFIG_RARP
+ if (do_rarp)
+ ic_rarp_init();
+ #endif

/*
*************** static int __init ic_dynamic(void)
*** 748,754 ****
*/
printk(KERN_NOTICE "Sending %s%s%s requests...",
! do_bootp ? "BOOTP" : "",
! do_bootp && do_rarp ? " and " : "",
! do_rarp ? "RARP" : "");
start_jiffies = jiffies;
retries = CONF_RETRIES;
--- 922,929 ----
*/
printk(KERN_NOTICE "Sending %s%s%s requests...",
! do_bootp
! ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
! (do_bootp && do_rarp) ? " and " : "",
! do_rarp ? "RARP" : "");
start_jiffies = jiffies;
retries = CONF_RETRIES;
*************** static int __init ic_dynamic(void)
*** 756,779 ****
timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
for(;;) {
! #ifdef CONFIG_IP_PNP_BOOTP
if (do_bootp)
ic_bootp_send(jiffies - start_jiffies);
#endif
! #ifdef CONFIG_IP_PNP_RARP
if (do_rarp)
ic_rarp_send();
#endif
printk(".");
jiff = jiffies + timeout;
while (jiffies < jiff && !ic_got_reply)
;
if (ic_got_reply) {
printk(" OK\n");
break;
}
if (! --retries) {
printk(" timed out!\n");
break;
}
timeout = timeout CONF_TIMEOUT_MULT;
if (timeout > CONF_TIMEOUT_MAX)
--- 931,968 ----
timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
for(;;) {
! #ifdef IPCONFIG_BOOTP
if (do_bootp)
ic_bootp_send(jiffies - start_jiffies);
#endif
! #ifdef IPCONFIG_RARP
if (do_rarp)
ic_rarp_send();
#endif
printk(".");
+
jiff = jiffies + timeout;
while (jiffies < jiff && !ic_got_reply)
;
+ #ifdef IPCONFIG_DHCP
+ if ((ic_got_reply & IC_BOOTP)
+ && (ic_proto_enabled & IC_USE_DHCP)
+ && ic_dhcp_msgtype != DHCPACK)
+ {
+ printk(",");
+ ic_got_reply = 0;
+ continue;
+ }
+ #endif /* IPCONFIG_DHCP */
+
if (ic_got_reply) {
printk(" OK\n");
break;
}
+
if (! --retries) {
printk(" timed out!\n");
break;
}
+
timeout = timeout CONF_TIMEOUT_MULT;
if (timeout > CONF_TIMEOUT_MAX)
*************** static int __init ic_dynamic(void)
*** 781,792 ****
}

! #ifdef CONFIG_IP_PNP_RARP
! if (do_rarp)
! ic_rarp_cleanup();
! #endif
! #ifdef CONFIG_IP_PNP_BOOTP
if (do_bootp)
ic_bootp_cleanup();
#endif

if (!ic_got_reply)
--- 970,981 ----
}

! #ifdef IPCONFIG_BOOTP
if (do_bootp)
ic_bootp_cleanup();
#endif
+ #ifdef IPCONFIG_RARP
+ if (do_rarp)
+ ic_rarp_cleanup();
+ #endif

if (!ic_got_reply)
*************** static int __init ic_dynamic(void)
*** 794,799 ****

printk("IP-Config: Got %s answer from %s, ",
! (ic_got_reply & IC_BOOTP) ? "BOOTP" : "RARP",
! in_ntoa(ic_servaddr));
printk("my address is %s\n", in_ntoa(ic_myaddr));

--- 983,989 ----

printk("IP-Config: Got %s answer from %s, ",
! ((ic_got_reply & IC_RARP) ? "RARP"
! : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
! in_ntoa(ic_servaddr));
printk("my address is %s\n", in_ntoa(ic_myaddr));

*************** static int __init ic_dynamic(void)
*** 801,805 ****
}

! #endif

/*
--- 991,1028 ----
}

! #endif /* IPCONFIG_DYNAMIC */
!
! #ifdef CONFIG_PROC_FS
!
! static int pnp_get_info(char *buffer, char **start,
! off_t offset, int length, int dummy)
! {
! int len;
!
! if (ic_proto_used & IC_PROTO)
! sprintf(buffer, "#PROTO: %s\n",
! (ic_proto_used & IC_RARP) ? "RARP"
! : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
! else
! strcpy(buffer, "#MANUAL\n");
! len = strlen(buffer);
!
! if (ic_domain[0])
! len += sprintf(buffer + len,
! "domain %s\n", ic_domain);
! if (ic_nameserver != INADDR_NONE)
! len += sprintf(buffer + len,
! "nameserver %s\n", in_ntoa(ic_nameserver));
!
! if (offset > len)
! offset = len;
! *start = buffer + offset;
!
! if (offset + length > len)
! length = len - offset;
! return length;
! }
!
! #endif /* CONFIG_PROC_FS */

/*
*************** static int __init ic_dynamic(void)
*** 809,812 ****
--- 1032,1044 ----
int __init ip_auto_config(void)
{
+ #ifdef CONFIG_PROC_FS
+ proc_net_register(&(struct proc_dir_entry) {
+ PROC_NET_PNP, 3, "pnp",
+ S_IFREG | S_IRUGO, 1, 0, 0,
+ 0, &proc_net_inode_operations,
+ pnp_get_info
+ });
+ #endif /* CONFIG_PROC_FS */
+
if (!ic_enable)
return 0;
*************** int __init ip_auto_config(void)
*** 828,833 ****
(root_server_addr == INADDR_NONE && ic_servaddr == INADDR_NONE) ||
#endif
! ic_first_dev->next) {
! #ifdef CONFIG_IP_PNP_DYNAMIC
if (ic_dynamic() < 0) {
printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
--- 1060,1067 ----
(root_server_addr == INADDR_NONE && ic_servaddr == INADDR_NONE) ||
#endif
! ic_first_dev->next)
! {
!
! #ifdef IPCONFIG_DYNAMIC
if (ic_dynamic() < 0) {
printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
*************** int __init ip_auto_config(void)
*** 839,845 ****
ic_close_devs();
return -1;
! #endif
} else {
! ic_dev = ic_first_dev->dev; /* Device selected manually or only one device -> use it */
}

--- 1073,1081 ----
ic_close_devs();
return -1;
! #endif /* IPCONFIG_DYNAMIC */
!
} else {
! /* Device selected manually or only one device -> use it */
! ic_dev = ic_first_dev->dev;
}

*************** int __init ip_auto_config(void)
*** 858,865 ****
return -1;

! DBG(("IP-Config: device=%s, local=%08x, server=%08x, boot=%08x, gw=%08x, mask=%08x\n",
! ic_dev->name, ic_myaddr, ic_servaddr, root_server_addr, ic_gateway, ic_netmask));
! DBG(("IP-Config: host=%s, domain=%s, path=`%s'\n", system_utsname.nodename,
! system_utsname.domainname, root_server_path));
return 0;
}
--- 1094,1115 ----
return -1;

! /*
! * Record which protocol was actually used.
! */
! ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
!
! #ifdef IPCONFIG_DEBUG
! printk("IP-Config: device=%s", ic_dev->name);
! printk(", addr=%s", in_ntoa(ic_myaddr));
! printk(", mask=%s", in_ntoa(ic_netmask));
! printk(", gw=%s", in_ntoa(ic_gateway));
! printk(",\n host=%s, domain=%s, nis-domain=%s",
! system_utsname.nodename, ic_domain, system_utsname.domainname);
! printk(",\n bootserver=%s", in_ntoa(ic_servaddr));
! printk(", rootserver=%s", in_ntoa(root_server_addr));
! printk(", rootpath=%s", root_server_path);
! printk("\n");
! #endif
!
return 0;
}
*************** int __init ip_auto_config(void)
*** 870,874 ****
* the following order:
*
! * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<bootp|rarp>
*
* Any of the fields can be empty which means to use a default value:
--- 1120,1124 ----
* the following order:
*
! * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
*
* Any of the fields can be empty which means to use a default value:
*************** int __init ip_auto_config(void)
*** 881,895 ****
* by BOOTP
* <device> - use all available devices
! * <bootp|rarp|both|off> - use both protocols to determine my own address
*/
static int __init ic_proto_name(char *name)
{
! if (!strcmp(name, "off")) {
ic_proto_enabled = 0;
return 1;
}
#ifdef CONFIG_IP_PNP_BOOTP
else if (!strcmp(name, "bootp")) {
! ic_proto_enabled &= ~IC_RARP;
return 1;
}
--- 1131,1154 ----
* by BOOTP
* <device> - use all available devices
! * <PROTO>:
! * dhcp|bootp|rarp - use given protocol
! * both or empty - use both BOOTP and RARP (not DHCP)
! * off or none - don't do autoconfig at all
*/
static int __init ic_proto_name(char *name)
{
! if (!strcmp(name, "off") || !strcmp(name, "none")) {
ic_proto_enabled = 0;
return 1;
}
+ #ifdef CONFIG_IP_PNP_DHCP
+ else if (!strcmp(name, "dhcp")) {
+ ic_proto_enabled &= ~IC_RARP;
+ return 1;
+ }
+ #endif
#ifdef CONFIG_IP_PNP_BOOTP
else if (!strcmp(name, "bootp")) {
! ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
return 1;
}
*************** static int __init ic_proto_name(char *na
*** 897,906 ****
#ifdef CONFIG_IP_PNP_RARP
else if (!strcmp(name, "rarp")) {
! ic_proto_enabled &= ~IC_BOOTP;
return 1;
}
#endif
! #ifdef CONFIG_IP_PNP_DYNAMIC
else if (!strcmp(name, "both")) {
return 1;
}
--- 1156,1166 ----
#ifdef CONFIG_IP_PNP_RARP
else if (!strcmp(name, "rarp")) {
! ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
return 1;
}
#endif
! #ifdef IPCONFIG_DYNAMIC
else if (!strcmp(name, "both")) {
+ ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
return 1;
}
*************** void __init ip_auto_config_setup(char *a
*** 914,919 ****
int num = 0;

! ic_set_manually = 1;
! if (!strcmp(addrs, "off")) {
ic_enable = 0;
return;
--- 1174,1178 ----
int num = 0;

! if (!strcmp(addrs, "off") || !strcmp(addrs, "none")) {
ic_enable = 0;
return;

--
Chip Salzenberg - a.k.a. - <chip@valinux.com>
"Fleagal. Bingo. Drooper. Snork. They're cops." //MST3K

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