/*
 * Copyright (c) 1995 Gordon Ross, Adam Glass
 * Copyright (c) 1992 Regents of the University of California.
 * All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratory and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * nfs/krpc_subr.c
 * $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
 * $FreeBSD: src/sys/nfs/bootp_subr.c,v 1.20.2.9 2003/04/24 16:51:08 ambrisko Exp $
 */

#include "opt_bootp.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/fcntl.h>

#include <net/if.h>
#include <net/if_var.h>
#include <net/route.h>

#include <netinet/in.h>
#include <net/if_types.h>
#include <net/if_dl.h>

#include "rpcv2.h"
#include "nfsproto.h"
#include "nfs.h"
#include "nfsdiskless.h"
#include "krpc.h"
#include "xdr_subs.h"
#include "nfsmountrpc.h"

#define BOOTP_MIN_LEN		300	/* Minimum size of bootp udp packet */

#ifndef BOOTP_SETTLE_DELAY
#define BOOTP_SETTLE_DELAY 3
#endif

/*
 * What is the longest we will wait before re-sending a request?
 * Note this is also the frequency of "RPC timeout" messages.
 * The re-send loop count sup linearly to this maximum, so the
 * first complaint will happen after (1+2+3+4+5)=15 seconds.
 */
#define	MAX_RESEND_DELAY 5	/* seconds */

/* Definitions from RFC951 */
struct bootp_packet {
	u_int8_t op;
	u_int8_t htype;
	u_int8_t hlen;
	u_int8_t hops;
	u_int32_t xid;
	u_int16_t secs;
	u_int16_t flags;
	struct in_addr ciaddr;
	struct in_addr yiaddr;
	struct in_addr siaddr;
	struct in_addr giaddr;
	unsigned char chaddr[16];
	char sname[64];
	char file[128];
	unsigned char vend[1222];
};

struct bootpc_ifcontext {
	struct bootpc_ifcontext *next;
	struct bootp_packet call;
	struct bootp_packet reply;
	int replylen;
	int overload;
	struct socket *so;
	struct ifreq ireq;
	struct ifnet *ifp;
	struct sockaddr_dl *sdl;
	struct sockaddr_in myaddr;
	struct sockaddr_in netmask;
	struct sockaddr_in gw;
	struct sockaddr_in broadcast;	/* Different for each interface */
	int gotgw;
	int gotnetmask;
	int gotrootpath;
	int outstanding;
	int sentmsg;
	u_int32_t xid;
	enum {
		IF_BOOTP_UNRESOLVED,
		IF_BOOTP_RESOLVED,
		IF_BOOTP_FAILED,
		IF_DHCP_UNRESOLVED,
		IF_DHCP_OFFERED,
		IF_DHCP_RESOLVED,
		IF_DHCP_FAILED,
	} state;
	int dhcpquerytype;		/* dhcp type sent */
	struct in_addr dhcpserver;
	int gotdhcpserver;
};

#define TAG_MAXLEN 1024
struct bootpc_tagcontext {
	char buf[TAG_MAXLEN + 1];
	int overload;
	int badopt;
	int badtag;
	int foundopt;
	int taglen;
};

struct bootpc_globalcontext {
	struct bootpc_ifcontext *interfaces;
	struct bootpc_ifcontext *lastinterface;
	u_int32_t xid;
	int gotrootpath;
	int gotswappath;
	int gotgw;
	int ifnum;
	int secs;
	int starttime;
	struct bootp_packet reply;
	int replylen;
	struct bootpc_ifcontext *setswapfs;
	struct bootpc_ifcontext *setrootfs;
	struct bootpc_ifcontext *sethostname;
	char lookup_path[24];
	struct bootpc_tagcontext tmptag;
	struct bootpc_tagcontext tag;
};

#define IPPORT_BOOTPC 68
#define IPPORT_BOOTPS 67

#define BOOTP_REQUEST 1
#define BOOTP_REPLY 2

/* Common tags */
#define TAG_PAD		  0  /* Pad option, implicit length 1 */
#define TAG_SUBNETMASK	  1  /* RFC 950 subnet mask */
#define TAG_ROUTERS	  3  /* Routers (in order of preference) */
#define TAG_HOSTNAME	 12  /* Client host name */
#define TAG_ROOT	 17  /* Root path */

/* DHCP specific tags */
#define TAG_OVERLOAD	 52  /* Option Overload */
#define TAG_MAXMSGSIZE   57  /* Maximum DHCP Message Size */

#define TAG_END		255  /* End Option (i.e. no more options) */

/* Overload values */
#define OVERLOAD_FILE     1
#define OVERLOAD_SNAME    2

/* Site specific tags: */
#define TAG_SWAP	128
#define TAG_SWAPSIZE	129
#define TAG_ROOTOPTS	130
#define TAG_SWAPOPTS	131
#define TAG_COOKIE	134	/* ascii info for userland, exported via sysctl */

#define TAG_DHCP_MSGTYPE 53
#define TAG_DHCP_REQ_ADDR 50
#define TAG_DHCP_SERVERID 54
#define TAG_DHCP_LEASETIME 51

#define TAG_VENDOR_INDENTIFIER 60

#define DHCP_NOMSG    0
#define DHCP_DISCOVER 1
#define DHCP_OFFER    2
#define DHCP_REQUEST  3
#define DHCP_ACK      5

static char bootp_cookie[128];
SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
	bootp_cookie, 0, "Cookie (T134) supplied by bootp server");

/* mountd RPC */
static void print_in_addr(struct in_addr addr);
static void print_sin_addr(struct sockaddr_in *addr);
static void clear_sinaddr(struct sockaddr_in *sin);
static
struct bootpc_ifcontext *allocifctx(struct bootpc_globalcontext *gctx);
static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
				 struct bootpc_globalcontext *gctx,
				 struct thread *td);
static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
				 struct bootp_packet *bp, int len, int tag);
static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
			      unsigned char *start, int len, int tag);

#ifdef BOOTP_DEBUG
void bootpboot_p_sa(struct sockaddr *sa,struct sockaddr *ma);
void bootpboot_p_ma(struct sockaddr *ma);
void bootpboot_p_rtentry(struct rtentry *rt);
void bootpboot_p_tree(struct radix_node *rn);
void bootpboot_p_rtlist(void);
void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
void bootpboot_p_iflist(void);
#endif

static int  bootpc_call(struct bootpc_globalcontext *gctx,
			struct thread *td);

static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
				   struct bootpc_globalcontext *gctx,
				   struct thread *td);

static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
				   struct bootpc_globalcontext *gctx,
				   struct thread *td);

static void bootpc_decode_reply(struct nfsv3_diskless *nd,
				struct bootpc_ifcontext *ifctx,
				struct bootpc_globalcontext *gctx);

static int bootpc_received(struct bootpc_globalcontext *gctx,
			   struct bootpc_ifcontext *ifctx);

static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);

void bootpc_init(void);

/*
 * In order to have multiple active interfaces with address 0.0.0.0
 * and be able to send data to a selected interface, we perform
 * some tricks:
 * 
 *  - The 'broadcast' address is different for each interface.
 *
 *  - We temporarily add routing pointing 255.255.255.255 to the
 *    selected interface broadcast address, thus the packet sent
 *    goes to that interface.
 */

#ifdef BOOTP_DEBUG
void
bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
{
	if (sa == NULL) {
		kprintf("(sockaddr *) <null>");
		return;
	}
	switch (sa->sa_family) {
	case AF_INET:
	{
		struct sockaddr_in *sin;
		
		sin = (struct sockaddr_in *) sa;
		kprintf("inet ");
		print_sin_addr(sin);
		if (ma != NULL) {
			sin = (struct sockaddr_in *) ma;
			kprintf(" mask ");
			print_sin_addr(sin);
		}
	}
	break;
	case AF_LINK:
	{
		struct sockaddr_dl *sli;
		int i;
		
		sli = (struct sockaddr_dl *) sa;
		kprintf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
		for (i = 0; i < sli->sdl_alen; i++) {
			if (i > 0)
				kprintf(":");
			kprintf("%x", ((unsigned char *) LLADDR(sli))[i]);
		}
	}
	break;
	default:
		kprintf("af%d", sa->sa_family);
	}
}


void
bootpboot_p_ma(struct sockaddr *ma)
{
	if (ma == NULL) {
		kprintf("<null>");
		return;
	}
	kprintf("%x", *(int *)ma);
}


void
bootpboot_p_rtentry(struct rtentry *rt)
{
	bootpboot_p_sa(rt_key(rt), rt_mask(rt));
	kprintf(" ");
	bootpboot_p_ma(rt->rt_genmask);
	kprintf(" ");
	bootpboot_p_sa(rt->rt_gateway, NULL);
	kprintf(" ");
	kprintf("flags %x", (unsigned short) rt->rt_flags);
	kprintf(" %d", (int) rt->rt_rmx.rmx_expire);
	kprintf(" %s\n", if_name(rt->rt_ifp));
}


void
bootpboot_p_tree(struct radix_node *rn)
{
	while (rn != NULL) {
		if (rn->rn_bit < 0) {
			if ((rn->rn_flags & RNF_ROOT) != 0) {
			} else {
				bootpboot_p_rtentry((struct rtentry *) rn);
			}
			rn = rn->rn_dupedkey;
		} else {
			bootpboot_p_tree(rn->rn_left);
			bootpboot_p_tree(rn->rn_right);
			return;
		}
	}
}


void
bootpboot_p_rtlist(void)
{
	kprintf("Routing table:\n");
	bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
}


void
bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
{
	kprintf("%s flags %x, addr ",
	       if_name(ifp),
	       (unsigned short) ifp->if_flags);
	print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
	kprintf(", broadcast ");
	print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
	kprintf(", netmask ");
	print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
	kprintf("\n");
}


void
bootpboot_p_iflist(void)
{
	struct ifnet *ifp;
	struct ifaddr_container *ifac;
	
	kprintf("Interface list:\n");
	ifnet_lock();
	TAILQ_FOREACH(ifp, &ifnetlist, if_link) {
		TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
			struct ifaddr *ifa = ifac->ifa;

			if (ifa->ifa_addr->sa_family == AF_INET)
				bootpboot_p_if(ifp, ifa);
		}
	}
	ifnet_unlock();
}
#endif /* defined(BOOTP_DEBUG) */


static void
clear_sinaddr(struct sockaddr_in *sin)
{
	bzero(sin, sizeof(*sin));
	sin->sin_len = sizeof(*sin);
	sin->sin_family = AF_INET;
	sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
	sin->sin_port = 0;
}


static struct bootpc_ifcontext *
allocifctx(struct bootpc_globalcontext *gctx)
{
	struct bootpc_ifcontext *ifctx;
	ifctx = (struct bootpc_ifcontext *) kmalloc(sizeof(*ifctx),
						   M_TEMP, M_WAITOK);
	bzero(ifctx, sizeof(*ifctx));
	ifctx->xid = gctx->xid;
#ifdef BOOTP_NO_DHCP
	ifctx->state = IF_BOOTP_UNRESOLVED;
#else
	ifctx->state = IF_DHCP_UNRESOLVED;
#endif
	gctx->xid += 0x100;
	return ifctx;
}


static __inline int
bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
{
	if (ifctx->state == IF_BOOTP_RESOLVED ||
	    ifctx->state == IF_DHCP_RESOLVED)
		return 1;
	return 0;
}


static __inline int
bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
{
	if (ifctx->state == IF_BOOTP_UNRESOLVED ||
	    ifctx->state == IF_DHCP_UNRESOLVED)
		return 1;
	return 0;
}


static __inline int
bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
{
	if (ifctx->state == IF_BOOTP_FAILED ||
	    ifctx->state == IF_DHCP_FAILED)
		return 1;
	return 0;
}


static int
bootpc_received(struct bootpc_globalcontext *gctx,
		struct bootpc_ifcontext *ifctx)
{
	unsigned char dhcpreplytype;
	char *p;
	/*
	 * Need timeout for fallback to less
	 * desirable alternative.
	 */


	/* This call used for the side effect (badopt flag) */
	(void) bootpc_tag(&gctx->tmptag, &gctx->reply,
			  gctx->replylen,
			  TAG_END);

	/* If packet is invalid, ignore it */
	if (gctx->tmptag.badopt != 0)
		return 0;
	
	p = bootpc_tag(&gctx->tmptag, &gctx->reply,
		       gctx->replylen, TAG_DHCP_MSGTYPE);
	if (p != NULL)
		dhcpreplytype = *p;
	else
		dhcpreplytype = DHCP_NOMSG;
	
	switch (ifctx->dhcpquerytype) {
	case DHCP_DISCOVER:
		if (dhcpreplytype != DHCP_OFFER 	/* Normal DHCP offer */
#ifndef BOOTP_FORCE_DHCP
		    && dhcpreplytype != DHCP_NOMSG	/* Fallback to BOOTP */
#endif
			)
			return 0;
		break;
	case DHCP_REQUEST:
		if (dhcpreplytype != DHCP_ACK)
			return 0;
		/* fall through */
	case DHCP_NOMSG:
		break;
	}
		
	
	/* Ignore packet unless it gives us a root tag we didn't have */
	
	if ((ifctx->state == IF_BOOTP_RESOLVED ||
	     (ifctx->dhcpquerytype == DHCP_DISCOVER &&
	      (ifctx->state == IF_DHCP_OFFERED ||
	       ifctx->state == IF_DHCP_RESOLVED))) &&
	    (bootpc_tag(&gctx->tmptag, &ifctx->reply,
			ifctx->replylen,
			TAG_ROOT) != NULL ||
	     bootpc_tag(&gctx->tmptag, &gctx->reply,
			gctx->replylen,
			TAG_ROOT) == NULL))
		return 0;
	
	bcopy(&gctx->reply,
	      &ifctx->reply,
	      gctx->replylen);
	ifctx->replylen = gctx->replylen;
	
	/* XXX: Only reset if 'perfect' response */
	if (ifctx->state == IF_BOOTP_UNRESOLVED)
		ifctx->state = IF_BOOTP_RESOLVED;
	else if (ifctx->state == IF_DHCP_UNRESOLVED &&
		 ifctx->dhcpquerytype == DHCP_DISCOVER) {
		if (dhcpreplytype == DHCP_OFFER)
			ifctx->state = IF_DHCP_OFFERED;
		else
			ifctx->state = IF_BOOTP_RESOLVED;	/* Fallback */
	} else if (ifctx->state == IF_DHCP_OFFERED &&
		   ifctx->dhcpquerytype == DHCP_REQUEST)
		ifctx->state = IF_DHCP_RESOLVED;
	
	
	if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
	    ifctx->state != IF_BOOTP_RESOLVED) {
		p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
			       ifctx->replylen, TAG_DHCP_SERVERID);
		if (p != NULL && gctx->tmptag.taglen == 4) {
			memcpy(&ifctx->dhcpserver, p, 4);
			ifctx->gotdhcpserver = 1;
		} else
			ifctx->gotdhcpserver = 0;
		return 1;
	}
	
	ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
					 ifctx->replylen,
					 TAG_ROOT) != NULL);
	ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
				   ifctx->replylen,
				   TAG_ROUTERS) != NULL);
	ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
					ifctx->replylen,
					TAG_SUBNETMASK) != NULL);
	return 1;
}

static int
bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
{
	struct socket *so;
	struct sockaddr_in *sin, dst;
	struct uio auio;
	struct sockopt sopt;
	struct iovec aio;
	int error, on, rcvflg, timo, len;
	time_t atimo;
	time_t rtimo;
	struct timeval tv;
	struct bootpc_ifcontext *ifctx;
	int outstanding;
	int gotrootpath;
	int retry;
	const char *s;
	char hexstr[64];
	
	/*
	 * Create socket and set its recieve timeout.
	 */
	error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
	if (error != 0)
		goto out;
	
	tv.tv_sec = 1;
	tv.tv_usec = 0;
	bzero(&sopt, sizeof(sopt));
	sopt.sopt_level = SOL_SOCKET;
	sopt.sopt_name = SO_RCVTIMEO;
	sopt.sopt_val = &tv;
	sopt.sopt_valsize = sizeof tv;
	
	error = sosetopt(so, &sopt);
	if (error != 0)
		goto out;
	
	/*
	 * Enable broadcast.
	 */
	on = 1;
	sopt.sopt_name = SO_BROADCAST;
	sopt.sopt_val = &on;
	sopt.sopt_valsize = sizeof on;

	error = sosetopt(so, &sopt);
	if (error != 0)
		goto out;

	/*
	 * Disable routing.
	 */

	on = 1;
	sopt.sopt_name = SO_DONTROUTE;
	sopt.sopt_val = &on;
	sopt.sopt_valsize = sizeof on;

	error = sosetopt(so, &sopt);
	if (error != 0)
		goto out;
	
	/*
	 * Bind the local endpoint to a bootp client port.
	 */
	sin = &dst;
	clear_sinaddr(sin);
	sin->sin_port = htons(IPPORT_BOOTPC);
	error = sobind(so, (struct sockaddr *)sin, td);
	if (error != 0) {
		kprintf("bind failed\n");
		goto out;
	}
	
	/*
	 * Setup socket address for the server.
	 */
	sin = &dst;
	clear_sinaddr(sin);
	sin->sin_addr.s_addr = INADDR_BROADCAST;
	sin->sin_port = htons(IPPORT_BOOTPS);
	
	/*
	 * Send it, repeatedly, until a reply is received,
	 * but delay each re-send by an increasing amount.
	 * If the delay hits the maximum, start complaining.
	 */
	timo = 0;
	rtimo = 0;
	for (;;) {
		
		outstanding = 0;
		gotrootpath = 0;

		for (ifctx = gctx->interfaces;
		     ifctx != NULL;
		     ifctx = ifctx->next) {
			if (bootpc_ifctx_isresolved(ifctx) != 0 &&
			    bootpc_tag(&gctx->tmptag, &ifctx->reply,
				       ifctx->replylen,
				       TAG_ROOT) != NULL)
				gotrootpath = 1;
		}
		
		for (ifctx = gctx->interfaces;
		     ifctx != NULL;
		     ifctx = ifctx->next) {
			ifctx->outstanding = 0;
			if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
			    gotrootpath != 0) {
				continue;
			}
			if (bootpc_ifctx_isfailed(ifctx) != 0)
				continue;

			outstanding++;
			ifctx->outstanding = 1;

			/* Proceed to next step in DHCP negotiation */
			if ((ifctx->state == IF_DHCP_OFFERED &&
			     ifctx->dhcpquerytype != DHCP_REQUEST) ||
			    (ifctx->state == IF_DHCP_UNRESOLVED &&
			     ifctx->dhcpquerytype != DHCP_DISCOVER) ||
			    (ifctx->state == IF_BOOTP_UNRESOLVED &&
			     ifctx->dhcpquerytype != DHCP_NOMSG)) {
				ifctx->sentmsg = 0;
				bootpc_compose_query(ifctx, gctx, td);
			}
			
			/* Send BOOTP request (or re-send). */
		
			if (ifctx->sentmsg == 0) {
				switch(ifctx->dhcpquerytype) {
				case DHCP_DISCOVER:
					s = "DHCP Discover";
					break;
				case DHCP_REQUEST:
					s = "DHCP Request";
					break;
				case DHCP_NOMSG:
				default:
					s = "BOOTP Query";
					break;
				}
				hexncpy((u_char *)LLADDR(ifctx->sdl),
				    ifctx->sdl->sdl_alen, hexstr,
				    HEX_NCPYLEN(ifctx->sdl->sdl_alen), ":");
				kprintf("Sending %s packet from "
				       "interface %s (%s)\n",
				       s, ifctx->ireq.ifr_name,
				       hexstr);
				ifctx->sentmsg = 1;
			}

			aio.iov_base = (caddr_t) &ifctx->call;
			aio.iov_len = sizeof(ifctx->call);
			
			auio.uio_iov = &aio;
			auio.uio_iovcnt = 1;
			auio.uio_segflg = UIO_SYSSPACE;
			auio.uio_rw = UIO_WRITE;
			auio.uio_offset = 0;
			auio.uio_resid = sizeof(ifctx->call);
			auio.uio_td = td;
			
			/* Set netmask to 0.0.0.0 */
			
			sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
			clear_sinaddr(sin);
			error = ifioctl(ifctx->so, SIOCSIFNETMASK,
					(caddr_t) &ifctx->ireq, proc0.p_ucred);
			if (error != 0)
				panic("bootpc_call:"
				      "set if netmask, error=%d",
				      error);
	
			error = sosend(so, (struct sockaddr *) &dst,
				       &auio, NULL, NULL, 0, td);
			if (error != 0) {
				kprintf("bootpc_call: sosend: %d state %08x\n",
				       error, (int) so->so_state);
			}

			/* XXX: Is this needed ? */
			tsleep(&error, 0, "bootpw", 10);
			
			/* Set netmask to 255.0.0.0 */
			
			sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
			clear_sinaddr(sin);
			sin->sin_addr.s_addr = htonl(0xff000000u);
			error = ifioctl(ifctx->so, SIOCSIFNETMASK,
					(caddr_t) &ifctx->ireq, proc0.p_ucred);
			if (error != 0)
				panic("bootpc_call:"
				      "set if netmask, error=%d",
				      error);
			
		}
		
		if (outstanding == 0 &&
		    (rtimo == 0 || time_uptime >= rtimo)) {
			error = 0;
			goto gotreply;
		}
		
		/* Determine new timeout. */
		if (timo < MAX_RESEND_DELAY)
			timo++;
		else {
			kprintf("DHCP/BOOTP timeout for server ");
			print_sin_addr(&dst);
			kprintf("\n");
		}
		
		/*
		 * Wait for up to timo seconds for a reply.
		 * The socket receive timeout was set to 1 second.
		 */
		atimo = timo + time_uptime;
		while (time_uptime < atimo) {
			aio.iov_base = (caddr_t) &gctx->reply;
			aio.iov_len = sizeof(gctx->reply);
			
			auio.uio_iov = &aio;
			auio.uio_iovcnt = 1;
			auio.uio_segflg = UIO_SYSSPACE;
			auio.uio_rw = UIO_READ;
			auio.uio_offset = 0;
			auio.uio_resid = sizeof(gctx->reply);
			auio.uio_td = td;
			
			rcvflg = 0;
			error = soreceive(so, NULL, &auio,
					  NULL, NULL, &rcvflg);
			gctx->secs = time_uptime - gctx->starttime;
			for (ifctx = gctx->interfaces;
			     ifctx != NULL;
			     ifctx = ifctx->next) {
				if (bootpc_ifctx_isresolved(ifctx) != 0 ||
				    bootpc_ifctx_isfailed(ifctx) != 0)
					continue;
				
				ifctx->call.secs = htons(gctx->secs);
			}
			if (error == EWOULDBLOCK)
				continue;
			if (error != 0)
				goto out;
			len = sizeof(gctx->reply) - auio.uio_resid;
			
			/* Do we have the required number of bytes ? */
			if (len < BOOTP_MIN_LEN)
				continue;
			gctx->replylen = len;
			
			/* Is it a reply? */
			if (gctx->reply.op != BOOTP_REPLY)
				continue;
			
			/* Is this an answer to our query */
			for (ifctx = gctx->interfaces;
			     ifctx != NULL;
			     ifctx = ifctx->next) {
				if (gctx->reply.xid != ifctx->call.xid)
					continue;
				
				/* Same HW address size ? */
				if (gctx->reply.hlen != ifctx->call.hlen)
					continue;
				
				/* Correct HW address ? */
				if (bcmp(gctx->reply.chaddr,
					 ifctx->call.chaddr,
					 ifctx->call.hlen) != 0)
					continue;

				break;
			}

			if (ifctx != NULL) {
				s =  bootpc_tag(&gctx->tmptag,
						&gctx->reply,
						gctx->replylen,
						TAG_DHCP_MSGTYPE);
				if (s != NULL) {
					switch (*s) {
					case DHCP_OFFER:
						s = "DHCP Offer";
						break;
					case DHCP_ACK:
						s = "DHCP Ack";
						break;
					default:
						s = "DHCP (unexpected)";
						break;
					}
				} else
					s = "BOOTP Reply";

				kprintf("Received %s packet"
				       " on %s from ",
				       s,
				       ifctx->ireq.ifr_name);
				print_in_addr(gctx->reply.siaddr);
				if (gctx->reply.giaddr.s_addr !=
				    htonl(INADDR_ANY)) {
					kprintf(" via ");
					print_in_addr(gctx->reply.giaddr);
				}
				if (bootpc_received(gctx, ifctx) != 0) {
					kprintf(" (accepted)");
					if (ifctx->outstanding) {
						ifctx->outstanding = 0;
						outstanding--;
					}
					/* Network settle delay */
					if (outstanding == 0)
						atimo = time_uptime +
							BOOTP_SETTLE_DELAY;
				} else
					kprintf(" (ignored)");
				if (ifctx->gotrootpath) {
					gotrootpath = 1;
					rtimo = time_uptime +
						BOOTP_SETTLE_DELAY;
					kprintf(" (got root path)");
				} else
					kprintf(" (no root path)");
				kprintf("\n");
			}
		} /* while secs */
#ifdef BOOTP_TIMEOUT
		if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
			break;
#endif
		/* Force a retry if halfway in DHCP negotiation */
		retry = 0;
		for (ifctx = gctx->interfaces; ifctx != NULL;
		     ifctx = ifctx->next) {
			if (ifctx->state == IF_DHCP_OFFERED) {
				if (ifctx->dhcpquerytype == DHCP_DISCOVER)
					retry = 1;
				else
					ifctx->state = IF_DHCP_UNRESOLVED;
			}
		}
		
		if (retry != 0)
			continue;
		
		if (gotrootpath != 0) {
			gctx->gotrootpath = gotrootpath;
			if (rtimo != 0 && time_uptime >= rtimo)
				break;
		}
	} /* forever send/receive */
	
	/* 
	 * XXX: These are errors of varying seriousness being silently
	 * ignored
	 */

	for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
		if (bootpc_ifctx_isresolved(ifctx) == 0) {
			kprintf("%s timeout for interface %s\n",
			       ifctx->dhcpquerytype != DHCP_NOMSG ?
			       "DHCP" : "BOOTP",
			       ifctx->ireq.ifr_name);
		}
	}
	if (gctx->gotrootpath != 0) {
#if 0
		kprintf("Got a root path, ignoring remaining timeout\n");
#endif
		error = 0;
		goto out;
	}
#ifndef BOOTP_NFSROOT
	for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
		if (bootpc_ifctx_isresolved(ifctx) != 0) {
			error = 0;
			goto out;
		}
	}
#endif
	error = ETIMEDOUT;
	goto out;
	
gotreply:
out:
	soclose(so, FNONBLOCK);
	return error;
}


static int
bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
			struct bootpc_globalcontext *gctx,
			struct thread *td)
{
	struct ifaddr_container *ifac;
	struct sockaddr_in *sin;
	int error;
	
	struct ifreq *ireq;
	struct socket *so;
	struct sockaddr_dl *sdl;

	error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
	if (error != 0)
		panic("nfs_boot: socreate, error=%d", error);
	
	ireq = &ifctx->ireq;
	so = ifctx->so;

	/*
	 * Bring up the interface.
	 *
	 * Get the old interface flags and or IFF_UP into them; if
	 * IFF_UP set blindly, interface selection can be clobbered.
	 */
	error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
	if (error != 0)
		panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
	ireq->ifr_flags |= IFF_UP;
	error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
	if (error != 0)
		panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
	
	/*
	 * Do enough of ifconfig(8) so that the chosen interface
	 * can talk to the servers.  (just set the address)
	 */
	
	/* addr is 0.0.0.0 */
	
	sin = (struct sockaddr_in *) &ireq->ifr_addr;
	clear_sinaddr(sin);
	error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
	if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
		panic("bootpc_fakeup_interface: "
		      "set if addr, error=%d", error);
	
	/* netmask is 255.0.0.0 */
	
	sin = (struct sockaddr_in *) &ireq->ifr_addr;
	clear_sinaddr(sin);
	sin->sin_addr.s_addr = htonl(0xff000000u);
	error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, proc0.p_ucred);
	if (error != 0)
		panic("bootpc_fakeup_interface: set if netmask, error=%d",
		      error);
	
	/* Broadcast is 255.255.255.255 */
	
	sin = (struct sockaddr_in *)&ireq->ifr_addr;
	clear_sinaddr(sin);
	clear_sinaddr(&ifctx->broadcast);
	sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
	ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
	
	error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, proc0.p_ucred);
	if (error != 0 && error != EADDRNOTAVAIL)
		panic("bootpc_fakeup_interface: "
		      "set if broadcast addr, error=%d",
		      error);
	error = 0;
	
	/* Get HW address */
	
	sdl = NULL;
	TAILQ_FOREACH(ifac, &ifctx->ifp->if_addrheads[mycpuid], ifa_link) {
		struct ifaddr *ifa = ifac->ifa;

		if (ifa->ifa_addr->sa_family == AF_LINK &&
		    (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
		    sdl->sdl_type == IFT_ETHER)
			break;
	}

	if (sdl == NULL)
		panic("bootpc: Unable to find HW address for %s",
		      ifctx->ireq.ifr_name);
	ifctx->sdl = sdl;
	
	return error;
}


static int
bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
			struct bootpc_globalcontext *gctx,
			struct thread *td)
{
	int error;
	struct sockaddr_in defdst;
	struct sockaddr_in defmask;
	struct sockaddr_in *sin;
	
	struct ifreq *ireq;
	struct socket *so;
	struct sockaddr_in *myaddr;
	struct sockaddr_in *netmask;
	struct sockaddr_in *gw;

	ireq = &ifctx->ireq;
	so = ifctx->so;
	myaddr = &ifctx->myaddr;
	netmask = &ifctx->netmask;
	gw = &ifctx->gw;

	if (bootpc_ifctx_isresolved(ifctx) == 0) {

		/* Shutdown interfaces where BOOTP failed */
		
		kprintf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
		error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
		if (error != 0)
			panic("bootpc_adjust_interface: "
			      "SIOCGIFFLAGS, error=%d", error);
		ireq->ifr_flags &= ~IFF_UP;
		error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
		if (error != 0)
			panic("bootpc_adjust_interface: "
			      "SIOCSIFFLAGS, error=%d", error);
		
		sin = (struct sockaddr_in *) &ireq->ifr_addr;
		clear_sinaddr(sin);
		error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, proc0.p_ucred);
		if (error != 0 && (error != EADDRNOTAVAIL ||
				   ifctx == gctx->interfaces))
			panic("bootpc_adjust_interface: "
			      "SIOCDIFADDR, error=%d", error);
		
		return 0;
	}

	kprintf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
	/*
	 * Do enough of ifconfig(8) so that the chosen interface
	 * can talk to the servers.  (just set the address)
	 */
	bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
	error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, proc0.p_ucred);
	if (error != 0)
		panic("bootpc_adjust_interface: "
		      "set if netmask, error=%d", error);
	
	/* Broadcast is with host part of IP address all 1's */
	
	sin = (struct sockaddr_in *) &ireq->ifr_addr;
	clear_sinaddr(sin);
	sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
		~ netmask->sin_addr.s_addr;
	error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, proc0.p_ucred);
	if (error != 0)
		panic("bootpc_adjust_interface: "
		      "set if broadcast addr, error=%d", error);
	
	bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
	error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
	if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
		panic("bootpc_adjust_interface: "
		      "set if addr, error=%d", error);
	
	/* Add new default route */

	if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
		clear_sinaddr(&defdst);
		clear_sinaddr(&defmask);
		error = rtrequest_global(RTM_ADD, (struct sockaddr *) &defdst,
					 (struct sockaddr *) gw,
					 (struct sockaddr *) &defmask,
					 (RTF_UP | RTF_GATEWAY | RTF_STATIC));
		if (error != 0) {
			kprintf("bootpc_adjust_interface: "
			       "add net route, error=%d\n", error);
			return error;
		}
	}
	
	return 0;
}

static void
print_sin_addr(struct sockaddr_in *sin)
{
	print_in_addr(sin->sin_addr);
}


static void
print_in_addr(struct in_addr addr)
{
	unsigned int ip;
	
	ip = ntohl(addr.s_addr);
	kprintf("%d.%d.%d.%d",
	       ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
}

static void
bootpc_compose_query(struct bootpc_ifcontext *ifctx,
		     struct bootpc_globalcontext *gctx, struct thread *td)
{
	unsigned char *vendp;
	unsigned char vendor_client[64];
	uint32_t leasetime;
	uint8_t vendor_client_len;

	ifctx->gotrootpath = 0;

	bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
	
	/* bootpc part */
	ifctx->call.op = BOOTP_REQUEST; 	/* BOOTREQUEST */
	ifctx->call.htype = 1;			/* 10mb ethernet */
	ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
	ifctx->call.hops = 0;
	if (bootpc_ifctx_isunresolved(ifctx) != 0)
		ifctx->xid++;
	ifctx->call.xid = txdr_unsigned(ifctx->xid);
	bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
	
	vendp = ifctx->call.vend;
	*vendp++ = 99;		/* RFC1048 cookie */
	*vendp++ = 130;
	*vendp++ = 83;
	*vendp++ = 99;
	*vendp++ = TAG_MAXMSGSIZE;
	*vendp++ = 2;
	*vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
	*vendp++ = sizeof(struct bootp_packet) & 255;

	ksnprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
		ostype, MACHINE, osrelease);
	vendor_client_len = strlen(vendor_client);
	*vendp++ = TAG_VENDOR_INDENTIFIER;
	*vendp++ = vendor_client_len;
	memcpy(vendp, vendor_client, vendor_client_len);
	vendp += vendor_client_len;
	ifctx->dhcpquerytype = DHCP_NOMSG;
	switch (ifctx->state) {
	case IF_DHCP_UNRESOLVED:
		*vendp++ = TAG_DHCP_MSGTYPE;
		*vendp++ = 1;
		*vendp++ = DHCP_DISCOVER;
		ifctx->dhcpquerytype = DHCP_DISCOVER;
		ifctx->gotdhcpserver = 0;
		break;
	case IF_DHCP_OFFERED:
		*vendp++ = TAG_DHCP_MSGTYPE;
		*vendp++ = 1;
		*vendp++ = DHCP_REQUEST;
		ifctx->dhcpquerytype = DHCP_REQUEST;
		*vendp++ = TAG_DHCP_REQ_ADDR;
		*vendp++ = 4;
		memcpy(vendp, &ifctx->reply.yiaddr, 4);
		vendp += 4;
		if (ifctx->gotdhcpserver != 0) {
			*vendp++ = TAG_DHCP_SERVERID;
			*vendp++ = 4;
			memcpy(vendp, &ifctx->dhcpserver, 4);
			vendp += 4;
		}
		*vendp++ = TAG_DHCP_LEASETIME;
		*vendp++ = 4;
		leasetime = htonl(300);
		memcpy(vendp, &leasetime, 4);
		vendp += 4;
	default:
		;
	}
	*vendp = TAG_END;
	
	ifctx->call.secs = 0;
	ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
}


static int
bootpc_hascookie(struct bootp_packet *bp)
{
	return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
		bp->vend[2] == 83 && bp->vend[3] == 99);
}


static void
bootpc_tag_helper(struct bootpc_tagcontext *tctx,
		  unsigned char *start, int len, int tag)
{
	unsigned char *j;
	unsigned char *ej;
	unsigned char code;

	if (tctx->badtag != 0 || tctx->badopt != 0)
		return;
	
	j = start;
	ej = j + len;
	
	while (j < ej) {
		code = *j++;
		if (code == TAG_PAD)
			continue;
		if (code == TAG_END)
			return;
		if (j >= ej || j + *j + 1 > ej) {
			tctx->badopt = 1;
			return;
		}
		len = *j++;
		if (code == tag) {
			if (tctx->taglen + len > TAG_MAXLEN) {
				tctx->badtag = 1;
				return;
			}
			tctx->foundopt = 1;
			if (len > 0)
				memcpy(tctx->buf + tctx->taglen,
				       j, len);
			tctx->taglen += len;
		}
		if (code == TAG_OVERLOAD)
			tctx->overload = *j;
		
		j += len;
	}
}


static unsigned char *
bootpc_tag(struct bootpc_tagcontext *tctx, struct bootp_packet *bp,
	   int len, int tag)
{
	tctx->overload = 0;
	tctx->badopt = 0;
	tctx->badtag = 0;
	tctx->foundopt = 0;
	tctx->taglen = 0;

	if (bootpc_hascookie(bp) == 0)
		return NULL;
	
	bootpc_tag_helper(tctx, &bp->vend[4],
			  (unsigned char *) bp + len - &bp->vend[4], tag);
	
	if ((tctx->overload & OVERLOAD_FILE) != 0)
		bootpc_tag_helper(tctx,
				  (unsigned char *) bp->file,
				  sizeof(bp->file),
				  tag);
	if ((tctx->overload & OVERLOAD_SNAME) != 0)
		bootpc_tag_helper(tctx,
				  (unsigned char *) bp->sname,
				  sizeof(bp->sname),
				  tag);
	
	if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
		return NULL;
	tctx->buf[tctx->taglen] = '\0';
	return tctx->buf;
}


static void
bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
		    struct bootpc_globalcontext *gctx)
{
	char *p;
	unsigned int ip;

	ifctx->gotgw = 0;
	ifctx->gotnetmask = 0;

	clear_sinaddr(&ifctx->myaddr);
	clear_sinaddr(&ifctx->netmask);
	clear_sinaddr(&ifctx->gw);
	
	ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
	
	ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
	ksnprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
		 "swap.%d.%d.%d.%d",
		 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
	
	kprintf("%s at ", ifctx->ireq.ifr_name);
	print_sin_addr(&ifctx->myaddr);
	kprintf(" server ");
	print_in_addr(ifctx->reply.siaddr);
	
	ifctx->gw.sin_addr = ifctx->reply.giaddr;
	if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
		kprintf(" via gateway ");
		print_in_addr(ifctx->reply.giaddr);
	}

	/* This call used for the side effect (overload flag) */
	(void) bootpc_tag(&gctx->tmptag,
			  &ifctx->reply, ifctx->replylen, TAG_END);
	
	if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
		if (ifctx->reply.sname[0] != '\0')
			kprintf(" server name %s", ifctx->reply.sname);
	if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
		if (ifctx->reply.file[0] != '\0')
			kprintf(" boot file %s", ifctx->reply.file);
	
	kprintf("\n");

	p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
		       TAG_SUBNETMASK);
	if (p != NULL) {
		if (gctx->tag.taglen != 4)
			panic("bootpc: subnet mask len is %d",
			      gctx->tag.taglen);
		bcopy(p, &ifctx->netmask.sin_addr, 4);
		ifctx->gotnetmask = 1;
		kprintf("subnet mask ");
		print_sin_addr(&ifctx->netmask);
		kprintf(" ");
	}
	
	p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
		       TAG_ROUTERS);
	if (p != NULL) {
		/* Routers */
		if (gctx->tag.taglen % 4)
			panic("bootpc: Router Len is %d", gctx->tag.taglen);
		if (gctx->tag.taglen > 0) {
			bcopy(p, &ifctx->gw.sin_addr, 4);
			kprintf("router ");
			print_sin_addr(&ifctx->gw);
			kprintf(" ");
			ifctx->gotgw = 1;
			gctx->gotgw = 1;
		}
	}
	
	p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
		       TAG_ROOT);
	if (p != NULL) {
		if (gctx->setrootfs != NULL) {
			kprintf("rootfs %s (ignored) ", p);
		} else 	if (setfs(&nd->root_saddr,
				  nd->root_hostnam, p)) {
			kprintf("rootfs %s ",p);
			gctx->gotrootpath = 1;
			ifctx->gotrootpath = 1;
			gctx->setrootfs = ifctx;
			
			p = bootpc_tag(&gctx->tag, &ifctx->reply,
				       ifctx->replylen,
				       TAG_ROOTOPTS);
			if (p != NULL) {
				nfs_mountopts(&nd->root_args, p);
				kprintf("rootopts %s ", p);
			}
		} else
			panic("Failed to set rootfs to %s",p);
	}

	p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
		       TAG_SWAP);
	if (p != NULL) {
		if (gctx->setswapfs != NULL) {
			kprintf("swapfs %s (ignored) ", p);
		} else 	if (setfs(&nd->swap_saddr,
				  nd->swap_hostnam, p)) {
			gctx->gotswappath = 1;
			gctx->setswapfs = ifctx;
			kprintf("swapfs %s ", p);

			p = bootpc_tag(&gctx->tag, &ifctx->reply,
				       ifctx->replylen,
				       TAG_SWAPOPTS);
			if (p != NULL) {
				/* swap mount options */
				nfs_mountopts(&nd->swap_args, p);
				kprintf("swapopts %s ", p);
			}
			
			p = bootpc_tag(&gctx->tag, &ifctx->reply,
				       ifctx->replylen,
				       TAG_SWAPSIZE);
			if (p != NULL) {
				int swaplen;
				if (gctx->tag.taglen != 4)
					panic("bootpc: "
					      "Expected 4 bytes for swaplen, "
					      "not %d bytes",
					      gctx->tag.taglen);
				bcopy(p, &swaplen, 4);
				nd->swap_nblks = ntohl(swaplen);
				kprintf("swapsize %d KB ",
				       nd->swap_nblks);
			}
		} else
			panic("Failed to set swapfs to %s", p);
	}

	p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
		       TAG_HOSTNAME);
	if (p != NULL) {
		if (gctx->tag.taglen >= MAXHOSTNAMELEN)
			panic("bootpc: hostname >= %d bytes",
			      MAXHOSTNAMELEN);
		if (gctx->sethostname != NULL) {
			kprintf("hostname %s (ignored) ", p);
		} else {
			strcpy(nd->my_hostnam, p);
			strcpy(hostname, p);
			kprintf("hostname %s ",hostname);
			gctx->sethostname = ifctx;
		}
	}
	p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
		       TAG_COOKIE);
	if (p != NULL) {	/* store in a sysctl variable */
		int i, l = sizeof(bootp_cookie) - 1;
		for (i = 0; i < l && p[i] != '\0'; i++)
			bootp_cookie[i] = p[i];
		p[i] = '\0';
	}

	kprintf("\n");
	
	if (ifctx->gotnetmask == 0) {
		if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
			ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
		else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
			ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
		else
			ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
	}
	if (ifctx->gotgw == 0) {
		/* Use proxyarp */
		ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
	}
}

void
bootpc_init(void)
{
	struct bootpc_ifcontext *ifctx, *nctx;	/* Interface BOOTP contexts */
	struct bootpc_globalcontext *gctx; 	/* Global BOOTP context */
	struct ifnet *ifp;
	int error;
	struct nfsv3_diskless *nd;
	struct thread *td;

	nd = &nfsv3_diskless;
	td = curthread;
	
	/*
	 * If already filled in, don't touch it here
	 */
	if (nfs_diskless_valid != 0)
		return;

	gctx = kmalloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
	
	gctx->xid = ~0xFFFF;
	gctx->starttime = time_uptime;
	
	ifctx = allocifctx(gctx);

	/*
	 * Find a network interface.
	 */
#ifdef BOOTP_WIRED_TO
	kprintf("bootpc_init: wired to interface '%s'\n",
	       __XSTRING(BOOTP_WIRED_TO));
#endif
	bzero(&ifctx->ireq, sizeof(ifctx->ireq));
	/* XXX ALMOST MPSAFE */
	ifnet_lock();
	TAILQ_FOREACH(ifp, &ifnetlist, if_link) {
		strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
			 sizeof(ifctx->ireq.ifr_name));
#ifdef BOOTP_WIRED_TO
		if (strcmp(ifctx->ireq.ifr_name,
			   __XSTRING(BOOTP_WIRED_TO)) != 0)
			continue;
#else
		if ((ifp->if_flags &
		     (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
		    IFF_BROADCAST)
			continue;
#endif
		if (gctx->interfaces != NULL)
			gctx->lastinterface->next = ifctx;
		else
			gctx->interfaces = ifctx;
		ifctx->ifp = ifp;
		gctx->lastinterface = ifctx;
		ifctx = allocifctx(gctx);
	}
	ifnet_unlock();
	kfree(ifctx, M_TEMP);
	
	if (gctx->interfaces == NULL) {
#ifdef BOOTP_WIRED_TO
		panic("bootpc_init: Could not find interface specified "
		      "by BOOTP_WIRED_TO: "
		      __XSTRING(BOOTP_WIRED_TO));
#else
		panic("bootpc_init: no suitable interface");
#endif
	}
		
	gctx->gotrootpath = 0;
	gctx->gotswappath = 0;
	gctx->gotgw = 0;
	
	for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
		bootpc_fakeup_interface(ifctx, gctx, td);
	
	for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
		bootpc_compose_query(ifctx, gctx, td);
	
	ifctx = gctx->interfaces;
	error = bootpc_call(gctx, td);
	
	if (error != 0) {
#ifdef BOOTP_NFSROOT
		panic("BOOTP call failed");
#else
		kprintf("BOOTP call failed\n");
#endif
	}
	
	nfs_mountopts(&nd->root_args, NULL);
	
	nfs_mountopts(&nd->swap_args, NULL);

	for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
		if (bootpc_ifctx_isresolved(ifctx) != 0)
			bootpc_decode_reply(nd, ifctx, gctx);
	
	if (gctx->gotswappath == 0)
		nd->swap_nblks = 0;
#ifdef BOOTP_NFSROOT
	if (gctx->gotrootpath == 0)
		panic("bootpc: No root path offered");
#endif
	
	for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
		bootpc_adjust_interface(ifctx, gctx, td);
		
		soclose(ifctx->so, FNONBLOCK);
	}

	for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
		if (ifctx->gotrootpath != 0)
			break;
	if (ifctx == NULL) {
		for (ifctx = gctx->interfaces;
		     ifctx != NULL;
		     ifctx = ifctx->next)
			if (bootpc_ifctx_isresolved(ifctx) != 0)
				break;
	}
	if (ifctx == NULL)
		goto out;
	
	if (gctx->gotrootpath != 0) {
		
		error = md_mount(&nd->root_saddr, nd->root_hostnam,
				 nd->root_fh, &nd->root_fhsize,
				 &nd->root_args, td);
		if (error != 0)
			panic("nfs_boot: mountd root, error=%d", error);
    
		if (gctx->gotswappath != 0) {
			
			error = md_mount(&nd->swap_saddr,
					 nd->swap_hostnam,
					 nd->swap_fh, &nd->swap_fhsize,
					 &nd->swap_args, td);
			if (error != 0)
				panic("nfs_boot: mountd swap, error=%d",
				      error);
			
			error = md_lookup_swap(&nd->swap_saddr,
					       gctx->lookup_path,
					       nd->swap_fh, &nd->swap_fhsize,
					       &nd->swap_args, td);
			if (error != 0)
				panic("nfs_boot: lookup swap, error=%d",
				      error);
		}
		nfs_diskless_valid = 3;
	}
	
	strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
	bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
	bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
	((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
		ifctx->myaddr.sin_addr.s_addr |
		~ ifctx->netmask.sin_addr.s_addr;
	bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
	
out:
	for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
		nctx = ifctx->next;
		kfree(ifctx, M_TEMP);
	}
	kfree(gctx, M_TEMP);
}