/*
 * Public Release 3
 * 
 * $Id: rip.c,v 1.2 1997/07/17 22:44:19 chopps Exp $
 */

/*
 * ------------------------------------------------------------------------
 * 
 * Copyright (c) 1996, 1997 The Regents of the University of Michigan
 * All Rights Reserved
 *  
 * Royalty-free licenses to redistribute GateD Release
 * 3 in whole or in part may be obtained by writing to:
 * 
 * 	Merit GateDaemon Project
 * 	4251 Plymouth Road, Suite C
 * 	Ann Arbor, MI 48105
 *  
 * THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE REGENTS OF THE
 * UNIVERSITY OF MICHIGAN AND MERIT DO NOT WARRANT THAT THE
 * FUNCTIONS CONTAINED IN THE SOFTWARE WILL MEET LICENSEE'S REQUIREMENTS OR
 * THAT OPERATION WILL BE UNINTERRUPTED OR ERROR FREE. The Regents of the
 * University of Michigan and Merit shall not be liable for
 * any special, indirect, incidental or consequential damages with respect
 * to any claim by Licensee or any third party arising from use of the
 * software. GateDaemon was originated and developed through release 3.0
 * by Cornell University and its collaborators.
 * 
 * Please forward bug fixes, enhancements and questions to the
 * gated mailing list: gated-people@gated.merit.edu.
 * 
 * ------------------------------------------------------------------------
 * 
 * Copyright (c) 1990,1991,1992,1993,1994,1995 by Cornell University.
 *     All rights reserved.
 * 
 * THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * GateD is based on Kirton's EGP, UC Berkeley's routing
 * daemon	 (routed), and DCN's HELLO routing Protocol.
 * Development of GateD has been supported in part by the
 * National Science Foundation.
 * 
 * ------------------------------------------------------------------------
 * 
 * Portions of this software may fall under the following
 * copyrights:
 * 
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms are
 * permitted provided that the above copyright notice and
 * this paragraph are duplicated in all such forms and that
 * any documentation, advertising materials, and other
 * materials related to such distribution and use
 * acknowledge that the software was developed by the
 * University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote
 * products derived from this software without specific
 * prior written permission.  THIS SOFTWARE IS PROVIDED
 * ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */


#define	INCLUDE_UDP

#include "include.h"
#include "inet.h"
#include "targets.h"
#define	RIPCMDS
#include "rip.h"
#include "krt.h"


static u_short rip_port;
flag_t rip_flags = 0;			/* Options */
trace *rip_trace_options = { 0 };	/* Trace flags */
metric_t rip_default_metric = 0;	/* Default metric to use when propogating */
pref_t rip_preference = 0;		/* Preference for RIP routes */

static task_timer *rip_timer_update;		/* To send updates */
static task_timer *rip_timer_flash;		/* To send flash updates */
static task_timer *rip_timer_age;		/* To age routes */

static task_job *rip_target_list_job;		/* To rebuild target list after interface changes */
static target rip_targets = { &rip_targets, &rip_targets };		/* Target list */

static int rip_unicast_ttl = -1;

#ifdef	IP_MULTICAST
static if_addr *rip_multicast_ifap = (if_addr *) 0;
static sockaddr_un *rip_addr_mc;	/* Multicast address */
static int rip_mc_count;
#endif	/* IP_MULTICAST */

int rip_n_trusted = 0;			/* Number of trusted gateways */
int rip_n_source = 0;			/* Number of source gateways */
gw_entry *rip_gw_list = 0;		/* List of RIP gateways */
adv_entry *rip_import_list = 0;		/* List of nets to import from RIP */
adv_entry *rip_export_list = 0;		/* List of sources to exports routes to RIP */
adv_entry *rip_int_policy = 0;		/* List of interface policy */

#if	defined(PROTO_SNMP) && defined(MIB_RIP)
u_int rip_global_changes;
u_int rip_global_responses;
#endif	/* defined(PROTO_SNMP) && defined(MIB_RIP) */

static const bits rip_flag_bits[] = {
    { RIPF_ON,		"ON" },
    { RIPF_BROADCAST,	"Broadcast" },
    { RIPF_SOURCE,	"Source" },
    { RIPF_CHOOSE,	"Choose" },
    { RIPF_NOCHECK,	"NoCheck" },
    { RIPF_FLASHDUE,	"FlashDue" },
    { RIPF_NOFLASH,	"NoFlash" },
    { RIPF_RECONFIG,	"ReConfig" },
    { RIPF_TERMINATE,	"Terminate" },
    { 0 }
} ;

static const bits rip_target_bits[] = {
    { RIPTF_POLL,	"Poll" },
    { RIPTF_V2MC,	"V2Multicast" },
    { RIPTF_V2BC,	"V2Broadcast" },
    { RIPTF_MCSET,	"MCEnabled" },
    { 0 }
} ;

static const bits rip_if_bits[] = {
    { RIP_IFPS_V2MC,	"V2Multicast" },
    { RIP_IFPS_V2BC,	"V2Broadcast" },
    { 0 }
} ;


static const flag_t rip_trace_masks[RIPCMD_MAX] = {
    TR_ALL,			/* 0 - Invalid */
    TR_RIP_DETAIL_REQUEST,	/* 1 - REQUEST */
    TR_RIP_DETAIL_RESPONSE,	/* 2 - RESPONSE */
    TR_RIP_DETAIL_OTHER,	/* 3 - TRACEON */
    TR_RIP_DETAIL_OTHER,	/* 4 - TRACEOFF */
    TR_RIP_DETAIL_REQUEST,	/* 5 - POLL */
    TR_RIP_DETAIL_OTHER,	/* 6 - POLLENTRY */
} ;

const bits rip_trace_types[] = {
    { TR_DETAIL,		"detail packets" },
    { TR_DETAIL_SEND,	"detail send packets" },
    { TR_DETAIL_RECV,	"detail recv packets" },
    { TR_PACKET,		"packets" },
    { TR_PACKET_SEND,	"send packets" },
    { TR_PACKET_RECV,	"recv packets" },
    { TR_DETAIL_1,	"detail request" },
    { TR_DETAIL_SEND_1,	"detail send request" },
    { TR_DETAIL_RECV_1,	"detail recv request" },
    { TR_PACKET_1,	"request" },
    { TR_PACKET_SEND_1,	"send request" },
    { TR_PACKET_RECV_1,	"recv request" },
    { TR_DETAIL_2,	"detail response" },
    { TR_DETAIL_SEND_2,	"detail send response" },
    { TR_DETAIL_RECV_2,	"detail recv response" },
    { TR_PACKET_2,	"response" },
    { TR_PACKET_SEND_2,	"send response" },
    { TR_PACKET_RECV_2,	"recv response" },
    { TR_DETAIL_3,	"detail other" },
    { TR_DETAIL_SEND_3,	"detail send other" },
    { TR_DETAIL_RECV_3,	"detail recv other" },
    { TR_PACKET_3,	"other" },
    { TR_PACKET_SEND_3,	"send other" },
    { TR_PACKET_RECV_3,	"recv other" },
    { 0, NULL }
};

/*
 *	Trace RIP packets
 */
static void
rip_trace __PF7(trp, trace *,
dir, int,
    		ifap, if_addr *,
		who, sockaddr_un *,
		rpmsg, register struct rip *,
		size, register size_t,
    		detail, int)
{
    int limit;
    int check_zero;
    register struct rip_netinfo *n = (struct rip_netinfo *) ((void_t) (rpmsg + 1));
    register const char *cmd = trace_state(rip_cmd_bits, rpmsg->rip_cmd < RIPCMD_MAX ? rpmsg->rip_cmd : 0);

    switch (rpmsg->rip_vers) {
    case RIP_VERSION_0:
	limit = 4;
	check_zero = FALSE;
	break;

    case RIP_VERSION_1:
	limit = 4;
	check_zero = BIT_TEST(rip_flags, RIPF_NOCHECK) ? FALSE : TRUE;
	break;

    default:
	limit = 1;
	check_zero = FALSE;
    }

    if (dir) {
	/* Trace packet transmission */

	tracef("RIP %sSENT %A -> %#A ",
	       dir > 0 ? "" : "*NOT* ",
	       ifap ? ifap->ifa_addr_local : sockbuild_str("Response"),
	       who);
    } else {
	/* Trace packet reception */
	tracef("RIP RECV %#A ",
	       who);
	if (task_recv_dstaddr) {
	    /* Some systems report the destination address */
	    tracef("-> %A ",
		   task_recv_dstaddr);
	}
    }
    tracef("vers %d, cmd %s, length %d",
	   rpmsg->rip_vers,
	   cmd,
	   size);
    if (check_zero && rpmsg->rip_zero2) {
	tracef(" reserved fields not zero");
    }
    switch (rpmsg->rip_cmd) {
    case RIPCMD_POLL:
    case RIPCMD_REQUEST:
    case RIPCMD_RESPONSE:
	trace_only_tf(trp,
		      0,
		      (NULL));
	if (detail) {
	    int n_routes = 0;

	    for (size -= (sizeof (struct rip));
		 size >= sizeof(struct rip_netinfo);
		 n++, size -= sizeof(struct rip_netinfo)) {
		char zero = ' ';
		int family = ntohs(n->rip_family);
		metric_t metric = ntohl(n->rip_metric);

		/* Verify that all reserved fields are zero */
		if (check_zero
		    && (n->rip_tag
			|| n->rip_dest_mask
			|| n->rip_router)) {
		    zero = '?';
		}

		switch (family) {
		case RIP_AF_INET:
		    if (rpmsg->rip_vers < RIP_VERSION_2) {
			tracef("\t%15A%c%2d",
			       sockbuild_in(0, n->rip_dest),
			       zero,
			       metric);
		    } else {
			tracef("\t%15A/%-15A router %-15A metric %2d tag %#04X",
			       sockbuild_in(0, n->rip_dest),
			       sockbuild_in(0, n->rip_dest_mask),
			       sockbuild_in(0, n->rip_router),
			       metric,
			       ntohs(n->rip_tag));
		    }
		    break;

		case RIP_AF_UNSPEC:
		    if (metric == RIP_METRIC_UNREACHABLE) {
			tracef("\trouting table request%c",
			       zero);
			break;
		    }
		    goto bogus;

		case RIP_AF_AUTH:
		    if (rpmsg->rip_vers > RIP_VERSION_1
			&& n == (struct rip_netinfo *) ((void_t) (rpmsg + 1))) {
			struct rip_authinfo *auth = (struct rip_authinfo *) n;
			int auth_type = ntohs(auth->auth_type);

			switch (auth_type) {
			case RIP_AUTH_NONE:
			    tracef("\tAuthentication: None");
			    break;	

			case RIP_AUTH_SIMPLE:
			    tracef("\tAuthentication: %.*s",
				   RIP_AUTH_SIZE,
				   (char *) auth->auth_data);
			    break;

#ifdef		MD5_CHECKSUM
			case RIP_AUTH_MD5:
			    {
				struct rip_trailer *rtp;
				
				tracef("\tAuthentication: MD5 Digest: %08x.%08x.%08x.%08x Sequence: ",
				       auth->auth_data[0],
				       auth->auth_data[1],
				       auth->auth_data[2],
				       auth->auth_data[3]);
				if (size % sizeof (struct rip_netinfo) >= sizeof (*rtp)) {
				    rtp = (struct rip_trailer *) (n + size / sizeof (struct rip_netinfo));
				    size -= sizeof (struct rip_trailer);
				    tracef("%08x (%T)",
					   ntohl(rtp->auth_sequence),
					   ntohl(rtp->auth_sequence) - time_boot);
				} else {
				    tracef("???");
				}
			    }
			    break;
#endif		/* MD5_CHECKSUM */
			    
			default:
			    tracef("\tInvalid auth type: %d",
				   auth_type);
			}
			break;
		    }
		    /* Fall through */

		default:
		bogus:
		    tracef("\tInvalid family: %d",
			   family);
		}
		if (++n_routes == limit) {
		    n_routes = 0;
		    trace_only_tf(trp,
				  TRC_NOSTAMP,
				  (NULL))
		}
	    }
	    if (n_routes) {
		trace_only_tf(trp,
			      TRC_NOSTAMP,
			      (NULL))
	    }
	    tracef("RIP %s end of packet",
		   dir ? "SENT" : "RECV");
	    if (size) {
		tracef(" %d residual bytes",
		       size);
	    }
	    trace_only_tf(trp,
			  TRC_NOSTAMP,
			  (NULL))
	}
	break;

    case RIPCMD_TRACEON:
    case RIPCMD_TRACEOFF:
	trace_only_tf(trp,
		      0,
		      (", file %*s",
		       size,
		       (char *) (rpmsg + 1)));
	break;

    case RIPCMD_POLLENTRY:
	trace_only_tf(trp,
		      0,
		      (", net %A",
		       sockbuild_in(0, n->rip_dest)));
	break;

    default:
	trace_only_tf(trp,
		      0,
		      (NULL));
	break;
    }
    trace_only_tf(trp,
		  0,
		  (NULL));
}


#ifdef	IP_MULTICAST
/* Remove ourselves from the MC group on this interface if necessary */
static void
rip_mc_reset __PF2(tp, task *,
		   tlp, target *)
{
    int *count = (int *) &tlp->target_ifap->ifa_rip_mccount;

    if (BIT_TEST(tlp->target_flags, RIPTF_MCSET)
	&& !--(*count)) {
	(void) task_set_option(tp,
			       TASKOPTION_GROUP_DROP,
			       tlp->target_ifap,
			       rip_addr_mc);
	BIT_RESET(tlp->target_flags, RIPTF_MCSET);
	if (!--rip_mc_count) {
	    krt_multicast_delete(rip_addr_mc);
	}
    }
}


/* Add ourselves to the MC group on this interface */
static int
rip_mc_set __PF2(tp, task *,
		 tlp, target *)
{
    flag_t ifps_state = tlp->target_ifap->ifa_ps[tp->task_rtproto].ips_state;
    int *count = (int *) &tlp->target_ifap->ifa_rip_mccount;
    int rc = FALSE;

    if (BIT_TEST(tlp->target_flags, RIPTF_MCSET)) {
	/* Indicate MC is already set */

	rc = TRUE;
    } else if (!BIT_TEST(ifps_state, RIP_IFPS_NOMC)
	       && !(*count)++) {
	/* Try to join the MC group on this interface */

	if (!BIT_TEST(tlp->target_ifap->ifa_state, IFS_MULTICAST)
	    || ((task_set_option(tp,
				 TASKOPTION_GROUP_ADD,
				 tlp->target_ifap,
				 rip_addr_mc) < 0)
		&& (errno != EADDRNOTAVAIL)
		&& (errno != EADDRINUSE))) {
	    /* Indicate that this interface is not capable of MC */

	    BIT_SET(ifps_state, RIP_IFPS_NOMC);

	    if (BIT_TEST(ifps_state, RIP_IFPS_V2MC)) {
		/* If V2 was explicitly enabled, complain */

		trace_log_tp(tp,
			     0,
			     LOG_WARNING,
			     ("rip_mc_set: Multicast not available on %A (%s); reverting to RIP V1 compatability",
			      tlp->target_ifap->ifa_addr,
			      tlp->target_ifap->ifa_link->ifl_name));
	    }
	} else {
	    /* Indicate that we successfully enabled the MC address */

	    BIT_SET(tlp->target_flags, RIPTF_MCSET);
	    tlp->target_reset = rip_mc_reset;
	    if (!rip_mc_count++) {
		krt_multicast_add(rip_addr_mc);
	    }
	    rc = TRUE;
	}
    }

    return rc;
}
#endif	/* IP_MULTICAST */

/**/
/* Authentication stuff */

block_t rip_auth_block_index;
struct rip_authinfo rip_auth_none;	/* Used to indicate no authentication */
struct rip_authinfo *rip_auth_query;	/* Authorization expected for user queries */

/* Check authentincation in a packet */
static struct rip_authinfo *
rip_auth_check __PF6(ripmsg, struct rip *,
		     nets, struct rip_netinfo **,
		     limit, void_t *,
		     gwp, gw_entry *,
		     ap1, struct rip_authinfo *,
		     ap2, struct rip_authinfo *)
{
    struct rip_authinfo *auth = (struct rip_authinfo *) *nets;
    struct rip_authinfo *aps[3];
    register struct rip_authinfo *ap, **app;

    /* Get packet auth */
    switch (ripmsg->rip_vers) {
    default:
	auth = (struct rip_authinfo *) *nets;
	if (ntohs(auth->auth_family) == RIP_AF_AUTH) {
	    (*nets)++;
	    break;
	}
	/* Fall through */

    case RIP_VERSION_0:
    case RIP_VERSION_1:
	auth = &rip_auth_none;
	break;
    }

    /* Get configured authentication */
    app = aps;
    if (ap1) {
	*app++ = ap1;
    }
    if (ap2) {
	*app++ = ap2;
    }
    if (app == aps) {
	/* Default to none */

	*app++ = &rip_auth_none;
    }
    *app = (struct rip_authinfo *) 0;
    for (app = aps; (ap = *app); app++) {
	if (ap->auth_type == auth->auth_type) {

	    switch (htons(ap->auth_type)) {
	    case RIP_AUTH_NONE:
		/* Nothing to compare */
		return ap;

	    case RIP_AUTH_SIMPLE:
		if (auth->auth_data[0] == ap->auth_data[0]
		    && auth->auth_data[1] == ap->auth_data[1]
		    && auth->auth_data[2] == ap->auth_data[2]
		    && auth->auth_data[3] == ap->auth_data[3]) {
		    /* Simple password match */

		    return ap;
		}
		break;

#ifdef	MD5_CHECKSUM
	    case RIP_AUTH_MD5:
	        {
		    struct rip_trailer *rtp = (struct rip_trailer *) ((void_t) ((byte *) *limit - sizeof (struct rip_trailer)));
		    u_int32 sequence = (u_int32) 0;

		    if ((byte *) rtp >= (byte *) *nets
			&& (!gwp
			    || (sequence = ntohl(rtp->auth_sequence)) >= (u_int32) GA2S(gwp->gw_data)
			    || time_sec - gwp->gw_time > RIP_T_EXPIRE)) {
			u_int32 digest[RIP_AUTH_SIZE / sizeof (u_int32)];

			/* Save the digest */
			digest[0] = auth->auth_data[0]; digest[1] = auth->auth_data[1];
			digest[2] = auth->auth_data[2]; digest[3] = auth->auth_data[3];

			/* Put the secret in */
			auth->auth_data[0] = ap->auth_data[0]; auth->auth_data[1] = ap->auth_data[1];
			auth->auth_data[2] = ap->auth_data[2]; auth->auth_data[3] = ap->auth_data[3];

			md5_cksum((byte *) ripmsg,
				  (size_t) ((byte *) *limit - (byte *) ripmsg),
				  (size_t) ((byte *) *limit - (byte *) ripmsg),
				  (byte *) auth->auth_data,
				  (u_int32 *) 0);

			if (digest[0] == auth->auth_data[0]
			    && digest[1] == auth->auth_data[1]
			    && digest[2] == auth->auth_data[2]
			    && digest[3] == auth->auth_data[3]) {
			    /* Success! */

			    /* Remove trailer length from size */
			    *limit = (void_t) rtp;

			    if (gwp) {
				/* Save the sequence number */
				gwp->gw_data = GS2A(sequence);
			    }
			    return ap;
			}
		    }
		}
		break;
#endif	/* MD5_CHECKSUM */

	    default:
		assert(FALSE);
	    }
	}
    }

    /* Nothing matched */
    return (struct rip_authinfo *) 0;
}


/* Set authentication in a packet */
static size_t
rip_auth_set __PF4(ripmsg, struct rip *,
		   ap, struct rip_authinfo *,
		   auth, struct rip_authinfo *,
		   size, size_t)
{

    if (auth && ap && ntohs(ap->auth_type) != RIP_AUTH_NONE) {
	/* Add authentication */
	
	auth->auth_family = htons(RIP_AF_AUTH);
	auth->auth_type = ap->auth_type;
	auth->auth_data[0] = ap->auth_data[0];
	auth->auth_data[1] = ap->auth_data[1];
	auth->auth_data[2] = ap->auth_data[2];
	auth->auth_data[3] = ap->auth_data[3];

	switch (ntohs(ap->auth_type)) {
	case RIP_AUTH_SIMPLE:
	    break;

#ifdef	MD5_CHECKSUM
	case RIP_AUTH_MD5:
	    {
		struct rip_trailer *rtp = (struct rip_trailer *) ((void_t) ((byte *) ripmsg + size));
								 
		/* Add sequence number */
		rtp->auth_sequence = htonl((u_long) (time_boot + time_sec));

		/* Add trailer to length */
		size += sizeof (*rtp);

		/* Calculate and add digest */
		md5_cksum((byte *) ripmsg,
			  size,
			  size,
			  auth->auth_data,
			  (u_int32 *) 0);
	    }
	    break;
#endif	/* MD5_CHECKSUM */
	}
    }

    return size;
}


/**/
static void
rip_send  __PF6(tp, task *,
		ifap, if_addr *,
		flags, flag_t,
		addr, sockaddr_un *,
		msg, struct rip *,
		size, size_t)
{
    u_short port = sock2port(addr);
    int rc;

    if (!port) {
	sock2port(addr) = rip_port;
    }

#ifdef	IP_MULTICAST
    if (inet_class_of(addr) == INET_CLASSC_MULTICAST) {

	/* Multicast sends fail if MSG_DONTROUTE is set */
	BIT_RESET(flags, MSG_DONTROUTE);
	
	if (rip_multicast_ifap != ifap) {
	    IFA_FREE(rip_multicast_ifap);
	    IFA_ALLOC(rip_multicast_ifap = ifap);
	    (void) task_set_option(tp,
				   TASKOPTION_MULTI_IF,
				   rip_multicast_ifap);
	}
    } else
#endif	/* IP_MULTICAST */
    {
	int ttl = BIT_TEST(flags, MSG_DONTROUTE) ? 1 : MAXTTL;
	
	/* Unicast processing */

	if (ttl != rip_unicast_ttl) {
	    /* Set the TTL */

	    (void) task_set_option(tp,
				   TASKOPTION_TTL,
				   rip_unicast_ttl = ttl);
	}
    }

    rc = task_send_packet(tp, (void_t) msg, size, flags, addr);

    if (TRACE_PACKET_SEND_TP(tp,
			     msg->rip_cmd,
			     RIPCMD_MAX,
			     rip_trace_masks)) {
	rip_trace(tp->task_trace,
		  rc,
		  ifap,
		  addr,
		  msg,
		  size,
		  TRACE_DETAIL_SEND_TP(tp,
				       msg->rip_cmd,
				       RIPCMD_MAX,
				       rip_trace_masks));
    }

    sock2port(addr) = port;
}


/* Send RIP updates to all targets on the list */
/*ARGSUSED*/
static int
rip_supply __PF6(tlp, target *,
		 dest, sockaddr_un *,
		 flags, flag_t,
		 send_flags, flag_t,
		 flash_update, int,
		 ap, struct rip_authinfo *)
{
    int count = 0;
    int changes = 0;
    size_t size;
    struct rip *ripmsg = task_get_send_buffer(struct rip *);
    struct rip_netinfo *start = (struct rip_netinfo *) ((void_t) (ripmsg + 1)), *fillp;
    struct rip_authinfo *auth;
    register td_entry *tdp;
    size_t max_size;
    /* Calculate max size */
    max_size = tlp->target_ifap->ifa_mtu - sizeof (struct udphdr);
    if (max_size > RIP_PKTSIZE) {
	max_size = RIP_PKTSIZE;
    }

    /* Initialize some fields in all the packets */
    bzero((caddr_t) ripmsg, sizeof *ripmsg);
	    
    ripmsg->rip_cmd = RIPCMD_RESPONSE;
    if (BIT_TEST(flags, RIPTF_V2)) {
	/* Set version 2 and authentication */

	ripmsg->rip_vers = RIP_VERSION_2;
	if (ap && ntohs(ap->auth_type) != RIP_AUTH_NONE) {
	    auth = (struct rip_authinfo *) ((void_t) start++);
	    max_size -= sizeof (struct rip_trailer);
	} else {
	    auth = (struct rip_authinfo *) 0;
	}
    } else {
	/* Set version 1 */

	ripmsg->rip_vers = RIP_VERSION_1;
	auth = (struct rip_authinfo *) 0;
    }
    /* Round out to size of route entry */
    max_size -= (max_size - sizeof (struct rip)) % sizeof (struct rip_netinfo);
    fillp = start;

    /* Open the routing table in case a holddown is over */
    rt_open(tlp->target_task);

    TD_LIST(tdp, &tlp->target_td) {
	int cleanup = 0;
	
	if (flash_update) {
	    if (!BIT_TEST(tdp->td_flags, TDF_CHANGED)) {
		/* End of changes for this target */
		
		break;
	    }
	} else {
	    /* Check for termination of holddown */
	    if (!BIT_TEST(rip_flags, RIPF_TERMINATE)
		&& BIT_TEST(tdp->td_flags, TDF_HOLDDOWN|TDF_POISON)
		&& !--tdp->td_metric) {
		/* Holddown is over - queue it to be released */

		cleanup++;
	    }
	}

	if (BIT_TEST(tdp->td_flags, TDF_CHANGED)) {
	    /* Reset the changed field */
	    BIT_RESET(tdp->td_flags, TDF_CHANGED);
	}

	size = (byte *) fillp - (byte *) ripmsg;
	if (size >= max_size) {
	    /* Send packet */

	    rip_send(tlp->target_task,
		     tlp->target_ifap,
		     send_flags,
		     dest,
		     ripmsg,
		     rip_auth_set(ripmsg, ap, auth, size));

	    count++;

	    /* Reset the fill pointer for the next time */
	    fillp = start;
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
	    /*
	     * Save the number of flash updates on the interface for the target
	     */
	    if (flash_update) {
		volatile u_int *rip_triggered_updates =
		    (u_int *) &tlp->target_ifap->ifa_rip_triggered_updates;
		*rip_triggered_updates++;
	    }
#endif	/* PROTO_SNMP && MIB_RIP */
	}

	/* Put this entry in the packet */
        {
	    register struct rip_netinfo *n = (struct rip_netinfo *) ((void_t) fillp);
	
	    n->rip_family = htons(RIP_AF_INET);
	    n->rip_tag = htons(0);	/* XXX - need to pick out of per entry structure */
	    n->rip_dest = sock2ip(tdp->td_rt->rt_dest);
	    if (BIT_TEST(flags, RIPTF_V2)) {
		n->rip_dest_mask = sock2ip(tdp->td_rt->rt_dest_mask);

		if (RT_IFAP(tdp->td_rt) == tlp->target_ifap) {
		    n->rip_router = sock2ip(RT_ROUTER(tdp->td_rt));
		} else {
		    n->rip_router = sock2ip(*tlp->target_src);
		}
	    } else {
		n->rip_dest_mask = 0;
		n->rip_router = 0;
	    }

	    if (BIT_TEST(tdp->td_flags, TDF_HOLDDOWN|TDF_POISON)) {
		n->rip_metric = htonl(RIP_METRIC_UNREACHABLE);
	    } else {
		if (BIT_TEST(rip_flags, RIPF_TERMINATE)) {
		    n->rip_metric = htonl(RIP_METRIC_SHUTDOWN);
		} else {
		    n->rip_metric = htonl((u_int32) tdp->td_metric);
		}
	    }

	    /* Update the fill pointer */
	    fillp++;
	}

	if (cleanup) {
	    if (TRACE_TP(tlp->target_task, TR_POLICY)) {
		if (!changes) {
		    trace_only_tp(tlp->target_task,
				  TRC_NL_BEFORE,
				  ("rip_supply: Policy for target %A(%s)",
				   *tlp->target_dst,
				   BIT_TEST(tlp->target_flags, RIPTF_V2MC) ? "mc " : ""));
		}
		trace_only_tp(tlp->target_task,
			      0,
			      ("\t%A/%A %s ended",
			       tdp->td_rt->rt_dest,
			       tdp->td_rt->rt_dest_mask,
			       BIT_TEST(tdp->td_flags, TDF_POISON) ? "poison" : "holddown"));
	    }
	    changes++;
	    TD_CLEANUP(tlp, tdp, TRUE);
	}
    } TD_LIST_END(tdp, &tlp->target_td) ;

    if (fillp > start) {
	/* OK to reply to a RIPQUERY with an empty packet */
	size = (byte *) fillp - (byte *) ripmsg;
	rip_send(tlp->target_task,
		 tlp->target_ifap,
		 send_flags,
		 dest,
		 ripmsg,
		 rip_auth_set(ripmsg, ap, auth, size));
	count++;
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
	/*
	 * Save the number of flash updates on the interface for the target
	 */
	if (flash_update) {
	    volatile u_int *rip_triggered_updates =
		(u_int *) &tlp->target_ifap->ifa_rip_triggered_updates;
	    *rip_triggered_updates++;
	}
#endif        /* PROTO_SNMP && MIB_RIP        */
    }

    if (TRACE_TP(tlp->target_task, TR_POLICY)
	|| changes) {
	trace_only_tp(tlp->target_task,
		      0,
		      (NULL));
    }
    
    rt_close(tlp->target_task, (gw_entry *) 0, changes, NULL);

    return count;
}


/*
 *	Process a valid response
 */
static void
rip_recv_response  __PF7(tp, task *,
			 gwp, gw_entry *,
			 src_addr, sockaddr_un *,
			 ifap, if_addr *,
			 msg, struct rip *,
			 n, register struct rip_netinfo *,
			 limit, void_t)
{
    int routes = 0;
    rt_parms rtparms;
    struct ifa_ps *ips = &ifap->ifa_ps[tp->task_rtproto];
    struct rip_netinfo *endp = (struct rip_netinfo *) limit;
#if   defined(PROTO_SNMP) && defined(MIB_RIP)
    volatile u_int *rip_bad_routes = (u_int *) &ifap->ifa_rip_bad_routes;
    struct timezone   time_zone;      /* Local variable for time zone */
    /*
     * Retrieve the current Greenwich Mean Time and save it so the RFC1155 TimeTick
     * value can be calculated for rip2PeerLastUpdate.
     */
    gettimeofday(&gwp->gw_last_update_time, &time_zone);
#endif	/* PROTO_SNMP && MIB_RIP */

    bzero((caddr_t) &rtparms, sizeof (rtparms));

    rtparms.rtp_n_gw = 1;
    rtparms.rtp_gwp = gwp;

    rt_open(tp);

    for (; n < endp; n++) {
	rt_entry *rt;

	routes++;
		
	if (ntohs(n->rip_family) != RIP_AF_INET) {
	    /* Only interested in inet routes */
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
	    gwp->gw_bad_routes++;
	    *rip_bad_routes++;
#endif	/* PROTO_SNMP && MIB_RIP */
	    continue;
	}

	rtparms.rtp_dest = sockbuild_in(0, n->rip_dest);
	if (!inet_class_valid(rtparms.rtp_dest)) {
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
	    gwp->gw_bad_routes++;
	    *rip_bad_routes++;
#endif	/* PROTO_SNMP && MIB_RIP */
	    continue;
	}

	rtparms.rtp_preference = rip_preference;

	/* Convert metric to host byte order */
	rtparms.rtp_metric = ntohl(n->rip_metric);

	/* Verify that metric is valid */
	if (!rtparms.rtp_metric || rtparms.rtp_metric > RIP_METRIC_UNREACHABLE) {
	    trace_log_tp(tp,
			 0,
			 LOG_NOTICE,
			 ("rip_recv_response: bad metric (%u) for net %A from %#A",
			  rtparms.rtp_metric,
			  rtparms.rtp_dest,
			  src_addr));
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
	    gwp->gw_bad_routes++;
	    *rip_bad_routes++;
#endif	/* PROTO_SNMP && MIB_RIP */
	    continue;
	}
		
	/* Now add hop count to metric */
	rtparms.rtp_metric += ips->ips_metric_in;

	rtparms.rtp_state = RTS_INTERIOR;

	/* Determine the mask and router */
	switch (msg->rip_vers) {
	default:
	    /* Mask */
	    if (n->rip_dest_mask
		|| sock2ip(rtparms.rtp_dest) == INADDR_DEFAULT) {
		/* Mask is supplied */

		rtparms.rtp_dest_mask = inet_mask_locate(n->rip_dest_mask);

		if (!rtparms.rtp_dest_mask) {
		    trace_log_tp(tp,
				 0,
				 LOG_NOTICE,
				 ("rip_recv_response: bad mask (%A) for net %A from %#A",
				  rtparms.rtp_dest_mask,
				  rtparms.rtp_dest,
				  src_addr));
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
		    gwp->gw_bad_routes++;
		    *rip_bad_routes++;
#endif	/* PROTO_SNMP && MIB_RIP */
		    continue;
		}
	    } else {
		/* Lookup the mask the old fashioned way */

		rtparms.rtp_dest_mask = inet_mask_withif(rtparms.rtp_dest, ifap, &rtparms.rtp_state);
	    }

	    /* Router */
	    if (n->rip_router) {
		/* Router was supplied */

		rtparms.rtp_router = sockbuild_in(0, n->rip_router);

		if (sockaddrcmp(ifap->ifa_addr_local,
				rtparms.rtp_router)) {
		    /* Router is me! */

		    continue;
		}
		
		if (if_withdst(rtparms.rtp_router) != ifap) {
		    /* Supplied router is invalid */
		    trace_log_tp(tp,
				 0,
				 LOG_NOTICE,
				 ("rip_recv_response: bad router (%A) for net %A from %#A",
				  rtparms.rtp_router,
				  rtparms.rtp_dest,
				  src_addr));
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
		    gwp->gw_bad_routes++;
		    *rip_bad_routes++;
#endif	/* PROTO_SNMP && MIB_RIP */
		    continue;
		}

		/* Router is OK */
		break;
	    } else {
		/* Router is source address */

		rtparms.rtp_router = gwp->gw_addr;
	    }
	    break;
	    
	case RIP_VERSION_0:
	case RIP_VERSION_1:
	    /* Derive mask and router the old fashioned way */
	    rtparms.rtp_dest_mask = inet_mask_withif(rtparms.rtp_dest, ifap, &rtparms.rtp_state);
	    rtparms.rtp_router = gwp->gw_addr;
	}
	if (!rtparms.rtp_dest_mask) {
	    /* No mask means zero subnet, ignore it */

#if	defined(PROTO_SNMP) && defined(MIB_RIP)
	    gwp->gw_bad_routes++;
	    *rip_bad_routes++;
#endif	/* PROTO_SNMP && MIB_RIP */
	    continue;
	}

	if (if_myaddr(ifap, rtparms.rtp_dest, rtparms.rtp_dest_mask)) {
	    /* Ignore route to interface */

#if	defined(PROTO_SNMP) && defined(MIB_RIP)
	if (!BIT_TEST(ifap->ifa_state,IFS_POINTOPOINT)) {
		gwp->gw_bad_routes++;
		*rip_bad_routes++;
	}
#endif	/* PROTO_SNMP && MIB_RIP */
	    continue;
	}
		
	rtparms.rtp_tag = ntohs(n->rip_tag);
		    
	rt = rt_locate(rtparms.rtp_state,
		       rtparms.rtp_dest,
		       rtparms.rtp_dest_mask,
		       RTPROTO_BIT(tp->task_rtproto));
	if (!rt) {
	    rt_head *rth;
	    
	    /* No route installed.  See if we are announcing another route */
	    rt = rt_locate(RTS_NETROUTE,
			   rtparms.rtp_dest,
			   rtparms.rtp_dest_mask,
			   RTPROTO_BIT_ANY);
	    if (rt &&
		(rth = rt->rt_head) &&
		rth->rth_n_announce &&
		(rt == rth->rth_active || rt == rth->rth_holddown)) {
		/* We are announcing this route */
		register target *tlp;

		/* RIP won't announce an active route if one in holddown */
		/* so check the holddown route first */
		rt = rth->rth_holddown;
		if (!rt) {
		    rt = rth->rth_active;
		}

		TARGET_LIST(tlp, &rip_targets) {
		    if (BIT_TEST(tlp->target_flags, TARGETF_SUPPLY) &&
			rtbit_isset(rt, tlp->target_rtbit)) {
			/* We are sending to this target */
			td_entry *tdp;

			TD_TSI_GET(tlp, rth, tdp);

			if (BIT_TEST(tdp->td_flags, TDF_HOLDDOWN|TDF_POISON) ||
			    tdp->td_metric < rtparms.rtp_metric) {
			    /* We are announcing this route from another protocol */

			    break;
			}
		    }
		} TARGET_LIST_END(tlp, &rip_targets) ;

		if (tlp) {
		    /* Announced via another protocol, ignore this route */
		    continue;
		}
	    }
	    
	    /* New route */
	    if (rtparms.rtp_metric < RIP_METRIC_UNREACHABLE &&
		import(rtparms.rtp_dest,
		       rtparms.rtp_dest_mask,
		       rip_import_list,
		       ips->ips_import,
		       rtparms.rtp_gwp->gw_import,
		       &rtparms.rtp_preference,
		       ifap,
		       (void_t) 0)) {
		/* Add new route */

		rt = rt_add(&rtparms);
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
		rip_global_changes++;
#endif	/* PROTO_SNMP && MIB_RIP */
	    } else {
		BIT_SET(rtparms.rtp_gwp->gw_flags, GWF_IMPORT);
	    }
	} else if (rt->rt_gwp == gwp) {
	    /* same route */
	    if (rtparms.rtp_metric > RIP_METRIC_UNREACHABLE) {
		rt_delete(rt);
	    } else if (rtparms.rtp_metric != rt->rt_metric
		       || !sockaddrcmp_in(rtparms.rtp_router, RT_ROUTER(rt))
		       || rtparms.rtp_tag != rt->rt_tag) {
		(void) rt_change(rt,
				 rtparms.rtp_metric,
				 rtparms.rtp_metric2,
				 rtparms.rtp_tag,
				 rt->rt_preference,
				 rt->rt_preference2,
				 1, &rtparms.rtp_router);
		rt_refresh(rt);
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
		rip_global_changes++;
#endif	/* PROTO_SNMP && MIB_RIP */
	    } else {
		rt_refresh(rt);
	    }
	} else if ((rtparms.rtp_metric < rt->rt_metric
		    || (rt_age(rt) > (RIP_T_EXPIRE / 2)
			&& rt->rt_metric == rtparms.rtp_metric))
		   && import(rtparms.rtp_dest,
			     rtparms.rtp_dest_mask,
			     rip_import_list,
			     ips->ips_import,
			     rtparms.rtp_gwp->gw_import,
			     &rtparms.rtp_preference,
			     ifap,
			     (void_t) 0)) {
	    /* Better metric or same metric and old route has */
	    /* not been refreshed. */

	    (void) rt_delete(rt);
	    rt = rt_add(&rtparms);
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
	    rip_global_changes++;
#endif	/* PROTO_SNMP && MIB_RIP */
	}
    }				/*  for each route */

    rt_close(tp, rtparms.rtp_gwp, routes, NULL);
}


/*
 *	Process a valid request
 */
static void
rip_recv_request __PF9(tp, task *,
		       src_addr, sockaddr_un *,
		       ifap, if_addr *,
		       tlp, target *,
		       msg, struct rip *,
		       n, register struct rip_netinfo *,
		       limit, void_t,
		       poll, int,
		       auth, struct rip_authinfo *)
{
    struct rip_netinfo *first = n;
    struct ifa_ps *ips = &ifap->ifa_ps[tp->task_rtproto];
    struct rip_netinfo *last = (struct rip_netinfo *) limit - 1;

    msg->rip_cmd = RIPCMD_RESPONSE;

    if (n == last
	&& n->rip_family == ntohs(RIP_AF_UNSPEC)
	&& n->rip_metric == ntohl(RIP_METRIC_UNREACHABLE)) {
	/* A routing table request */

	if (poll) {
	    int count = 0;
	    gw_entry *gwp;
	    
	    /* Dump all the rip routes */

	    /* We can fill the whole packet */
	    last = (struct rip_netinfo *) ((void_t) ((caddr_t) msg + RIP_MAXSIZE(ifap) - 1));

	    GW_LIST(rip_gw_list, gwp) {
		rt_entry *rt;

		RTQ_LIST(&gwp->gw_rtq, rt) {
		    if (n > last) {
			rip_send(tp,
				 (if_addr *) 0,
				 0,
				 src_addr,
				 (void_t) msg,
				 (size_t) ((caddr_t) n - (caddr_t) msg));
			n = first;
			count++;
		    }

		    n->rip_family = htons(socktype(rt->rt_dest));
		    n->rip_tag = htons(0);	/* XXX - need to pick out of per entry structure */
		    n->rip_dest = sock2ip(rt->rt_dest);
		    if (msg->rip_vers > RIP_VERSION_1) {
			n->rip_dest_mask = sock2ip(rt->rt_dest_mask ? rt->rt_dest_mask : inet_mask_host);
			if (RT_IFAP(rt) == ifap) {
			    n->rip_router = sock2ip(RT_ROUTER(rt));
			} else {
			    n->rip_router = sock2ip(ifap->ifa_addr_local);
			}
		    } else {
			n->rip_dest_mask = 0;
			n->rip_router = 0;
		    }
		    n->rip_metric = htonl(rt->rt_metric);

		    n++;
		} RTQ_LIST_END(&gwp->gw_rtq, rt) ;
	    } GW_LIST_END(rip_gw_list, gwp) ;

	    if (!count || n > first) {
		/* Send an empty packet or remaining data */
		rip_send(tp,
			 (if_addr *) 0,
			 0,
			 src_addr,
			 (void_t) msg,
			 (size_t) ((caddr_t) n - (caddr_t) msg));
#if   defined(PROTO_SNMP) && defined(MIB_RIP)
			 rip_global_responses++;
#endif	/* PROTO_SNMP && MIB_RIP */
	    }
	} else {
	    /* Request - dump full routing table */

	    
	    if (tlp) {
		flag_t flags = tlp->target_flags;
		
		if (msg->rip_vers < RIP_VERSION_2) {
		    /* Do not respond to version 1 requests with version 2 packets */

		    BIT_RESET(flags, RIPTF_V2);
		} else if (sock2port(task_recv_srcaddr) != rip_port
			   && !BIT_TEST(flags, RIPTF_V2)) {
		    /* Answer V2 queries with V2 information */

		    BIT_SET(flags, RIPTF_V2BC);
		}

		(void) rip_supply(tlp,
				  src_addr,
				  flags,
				  (flag_t) 0,
				  FALSE,
				  auth);

	    } else {
		/* If nothing to send him, provide an empty packet */
		rip_send(tp,
			 (if_addr *) 0,
			 0,
			 src_addr,
			 (void_t) msg,
			 (size_t) ((caddr_t) n - (caddr_t) msg));
#if   defined(PROTO_SNMP) && defined(MIB_RIP)
			 rip_global_responses++;
#endif        /* PROTO_SNMP && MIB_RIP */
	    }
	}
    } else {

	/* Specific request */

	while (n <= last) {
	    /* Process each one */

	    n->rip_metric = RIP_METRIC_UNREACHABLE;
	    
	    if (n->rip_family == htons(RIP_AF_INET)) {
		sockaddr_un *addr = sockbuild_in(0, n->rip_dest);
		sockaddr_un *mask;
		flag_t table = RTS_INTERIOR;

		if (msg->rip_vers > RIP_VERSION_1
		    && n->rip_dest_mask) {
		    mask = inet_mask_locate(n->rip_dest_mask);
		} else {
		    mask = inet_mask_withif(addr, ifap, (flag_t *) 0);
		}
		if (mask) {
		    rt_entry *rt = rt_locate(table,
					     addr,
					     mask,
					     poll ? RTPROTO_BIT(tp->task_rtproto) : RTPROTO_BIT_ANY);

		    if (rt && !BIT_TEST(rt->rt_state, RTS_HIDDEN)) {
			n->rip_metric = rt->rt_metric;
			n->rip_metric += ips->ips_metric_out;
			n->rip_dest = sock2ip(rt->rt_dest);
			if(msg->rip_vers > RIP_VERSION_1) {
	        		n->rip_dest_mask = sock2ip(rt->rt_dest_mask ? rt->rt_dest_mask : inet_mask_host);
			if(RT_IFAP(rt) == ifap) {
				n->rip_router = sock2ip(RT_ROUTER(rt));
			} else  {
				n->rip_router = sock2ip(ifap->ifa_addr_local);
			}
		    } else {
			n->rip_dest_mask = 0;
			n->rip_router = 0;
		    }
	            if (n->rip_metric > RIP_METRIC_UNREACHABLE) {
		        n->rip_metric = RIP_METRIC_UNREACHABLE;
			}
		    }
		}
	    }
	    GHTONL(n->rip_metric);
	    n++;
	}

	rip_send(tp,
		 (if_addr *) 0,
		 0,
		 src_addr,
		 (void_t) msg,
		 (size_t) ((caddr_t) n - (caddr_t) msg));

#if	defined(PROTO_SNMP) && defined(MIB_RIP)
    rip_global_responses++;
#endif	/* PROTO_SNMP && MIB_RIP */
    }
}


/*
 *	Process a valid poll-entry packet
 */
static void
rip_recv_pollentry __PF4(tp, task *,
			 src_addr, sockaddr_un *,
			 ifap, if_addr *,
			 msg, struct rip *)
{
    rt_entry *rt = (rt_entry *) 0;
    struct rip_netinfo *n = (struct rip_netinfo *) ((void_t) (msg + 1));

    if (n->rip_family == RIP_AF_INET) {
	sockaddr_un *addr = sockbuild_in(0, n->rip_dest);
	sockaddr_un *mask = inet_mask_withif(addr, ifap, (flag_t *) 0);
	flag_t table = RTS_INTERIOR;

	if (mask) {
	    rt = rt_locate(table,
			   addr,
			   mask,
			   RTPROTO_BIT_ANY);
	}
    }

    if (rt) {
	/* don't bother to check rip_vers */

	struct entryinfo *e = (struct entryinfo *) n;

	bzero((caddr_t) &e->rtu_dst, sizeof (e->rtu_dst));
	e->rtu_dst.rip_family = htons(socktype(rt->rt_dest));
	e->rtu_dst.rip_addr = sock2ip(rt->rt_dest);		/* struct copy */
	bzero((caddr_t) &e->rtu_router, sizeof (e->rtu_router));
	e->rtu_router.rip_family = htons(socktype(RT_ROUTER(rt)));
	e->rtu_router.rip_addr = sock2ip(RT_ROUTER(rt));	/* struct copy */
	e->rtu_flags = htons((unsigned short) krt_state_to_flags(rt->rt_state));
	e->rtu_state = htons((unsigned short) rt->rt_state);
	e->rtu_timer = htonl((unsigned long) rt_age(rt));
	e->rtu_metric = htonl(rt->rt_metric);
	if (RT_IFAP(rt)) {
	    e->rtu_int_flags = htonl((unsigned long) RT_IFAP(rt)->ifa_state);
	    (void) strncpy(e->rtu_int_name, RT_IFAP(rt)->ifa_link->ifl_name, IFL_NAMELEN);
	} else {
	    e->rtu_int_flags = 0;
	    (void) strncpy(e->rtu_int_name, "(none)", IFL_NAMELEN);
	}
    } else {
	bzero((char *) n, sizeof (struct entryinfo));
    }

    rip_send(tp,
	     (if_addr *) 0,
	     0,
	     src_addr,
	     (void_t) msg,
	     sizeof (struct rip) + sizeof (struct entryinfo));
#if   defined(PROTO_SNMP) && defined(MIB_RIP)
	     rip_global_responses++;
#endif	/* PROTO_SNMP && MIB_RIP */
}


/*
 * 	Check out a newly received RIP packet.
 */
static void
rip_recv __PF1(tp, task *)
{
    size_t size;
    int n_packets = TASK_PACKET_LIMIT;

#define	REJECT(p, m)	{ reject_msg = (m); pri = (p); goto Reject; }

    while (n_packets-- && !task_receive_packet(tp, &size)) {
	register if_addr *ifap = (if_addr *) 0;
	gw_entry *gwp = (gw_entry *) 0;
	register int OK = TRUE;
	struct rip *inripmsg = task_get_recv_buffer(struct rip *);
	int pri = 0;
	const char *reject_msg = (char *) 0;
	int check_zero = FALSE;
	int poll = FALSE;
	struct rip_netinfo *nets = (struct rip_netinfo *) ((void_t) (inripmsg + 1));
	void_t limit = (void_t) ((byte *) inripmsg + size);

	if (socktype(task_recv_srcaddr) != RIP_AF_INET) {
	    REJECT(0, "protocol not INET");
	}

	/* Locate or create a gateway structure for this gateway */
	gwp = gw_locate(&rip_gw_list,
			tp->task_rtproto,
			tp,
			(as_t) 0,
			(as_t) 0,
			task_recv_srcaddr,
			GWF_NEEDHOLD);

	switch (inripmsg->rip_vers) {
	case RIP_VERSION_0:
	    REJECT(LOG_NOTICE, "ignoring version 0 packets");

	case RIP_VERSION_1:
	    check_zero = BIT_TEST(rip_flags, RIPF_NOCHECK) ? FALSE : TRUE;
	    break;

	default:
	    check_zero = FALSE;
	}

	/* If we have a list of trusted gateways, verify that this gateway is trusted */
	if (rip_n_trusted && !BIT_TEST(gwp->gw_flags, GWF_TRUSTED)) {
	    OK = FALSE;
	}
	if (TRACE_PACKET_RECV_TP(tp,
				 inripmsg->rip_cmd,
				 RIPCMD_MAX,
				 rip_trace_masks)) {
	    rip_trace(tp->task_trace,
		      0,
		      ifap,
		      gwp->gw_addr,
		      inripmsg,
		      size,
		      TRACE_DETAIL_RECV_TP(tp,
					   inripmsg->rip_cmd,
					   RIPCMD_MAX,
					   rip_trace_masks));
	}

	if (check_zero) {
	    /* Verify that all reserved fields are zero */
	    register struct rip_netinfo *n;

	    if (inripmsg->rip_zero2) {
		goto not_zero;
	    }

	    switch (inripmsg->rip_cmd) {
	    case RIPCMD_REQUEST:
	    case RIPCMD_RESPONSE:
		/* Check the fields in the entries */

		for (n = (struct rip_netinfo *) ((void_t) (inripmsg + 1));
		     (byte *) n < (byte *) limit;
		     n++) {
		    if (n->rip_tag ||
			n->rip_dest_mask ||
			n->rip_router) {
		not_zero:
			pri = BIT_TEST(gwp->gw_flags, GWF_FORMAT) ? 0 : LOG_WARNING;
			BIT_SET(gwp->gw_flags, GWF_FORMAT);
			REJECT(pri, "reserved field not zero");
		    }
		}
		break;
	    }
	}

	/* Subtract header length from size */
	size -= sizeof (struct rip);
	
	/* Process packet */
	switch (inripmsg->rip_cmd) {
	case RIPCMD_POLL:
	    poll = TRUE;
	    /* Fall through */

	case RIPCMD_REQUEST:
	    {
		target *tlp = (target *) 0;
		struct rip_authinfo *auth = (struct rip_authinfo *) 0;

		if (poll || sock2port(task_recv_srcaddr) != rip_port) {
		    /* We should answer this request */

		    /* BSD 4.3 Reno has a bug causing the address to be zero */
		    if (task_recv_dstaddr
			&& sock2ip(task_recv_dstaddr)
#ifdef	IP_MULTICAST
			&& !sockaddrcmp(task_recv_dstaddr, rip_addr_mc)
#endif	/* IP_MULTICAST */
			) {
			/* On some systems we can find the destination address of the packet */
			ifap = if_withlcladdr(task_recv_dstaddr, TRUE);
			if (!ifap) {
			    REJECT(0, "can not find interface for source address");
			}
		    } else {
			ifap = if_withdst(gwp->gw_addr);
			if (!ifap) {
			    /* This host does not share a network */
			    rt_entry *rt;
			    
			    rt = rt_lookup(RTS_NETROUTE,
					   (flag_t) 0,
					   gwp->gw_addr,
					   RTPROTO_BIT_ANY);

			    if (!rt) {
				REJECT(0, "can not find interface for route");
			    }
			    ifap = RT_IFAP(rt);
			}
		    }
		}

		if (!poll) {
		    target *tlp2;

		    if (sock2port(task_recv_srcaddr) == rip_port) {
			/* This is a request from a router, make sure we should */
			/* and are allowed to reply */

			if (if_withlcladdr(gwp->gw_addr, FALSE)) {
			    /* Ignore my own requests */
			    continue;
			}
			if (!OK) {
			    REJECT(0, "not on trustedgateways list");
			}
			if (!(ifap = if_withdst(gwp->gw_addr))) {
			    REJECT(0, "not on attached network");
			}
			if (BIT_TEST(ifap->ifa_ps[tp->task_rtproto].ips_state, IFPS_NOIN|IFPS_NOOUT)) {
			    REJECT(0, "interface marked for no RIP in/out");
			}

			/* Verify authentication */
			if (rip_auth_check(inripmsg,
					   &nets,
					   &limit,
					   (gw_entry *) 0,
					   ifap ? (struct rip_authinfo *) ifap->ifa_rip_auth : (struct rip_authinfo *) 0,
					   ifap ? (struct rip_authinfo *) ifap->ifa_rip_auth2 : (struct rip_authinfo *) 0)) {
			    /* Success - indicate that we reply with primary authentication */

			    auth = ifap->ifa_rip_auth ? (struct rip_authinfo *) ifap->ifa_rip_auth : &rip_auth_none;
			} else {
			    /* Failed */

			    pri = BIT_TEST(gwp->gw_flags, GWF_AUTHFAIL) ? 0 : LOG_WARNING;
			    BIT_SET(gwp->gw_flags, GWF_AUTHFAIL);
			    REJECT(pri, "authentication failure");
			}
		    }

		    /* Find the Target for this host */
		    TARGET_LIST(tlp2, &rip_targets) {
			/* Look for target for this interface */

			if (BIT_TEST(tlp2->target_flags, TARGETF_SUPPLY)) {
			    if (tlp2->target_gwp == gwp) {
				/* Found a target for this gateway! */

				tlp = tlp2;
				break;
			    } else if (tlp2->target_ifap == ifap) {
				/* Found a target for this interface */
				/* remember it, but keep looking in case */
				/* there is one for the gateway */

				tlp = tlp2;
			    }
			}
		    } TARGET_LIST_END(tlp2, &rip_targets) ;

		    /* Verify that we can respond */
		    if (tlp
			&& inripmsg->rip_vers < RIP_VERSION_2
			&& BIT_TEST(tlp->target_flags, RIPTF_V2)) {
			/* Do not respond to version 1 packets if we */
			/* are configured to send version 2 */

			REJECT(0, "not sending RIP 1");
		    }
			
		    if (sock2port(task_recv_srcaddr) == rip_port) {
			/* More sanity check on a request from a router */

			if (!tlp) {
			    REJECT(0, "not supplying RIP");
			}

#ifdef	IP_MULTICAST
			/* Caveat: */

			if (BIT_TEST(tlp->target_flags, RIPTF_V2MC)
			    && inripmsg->rip_vers < RIP_VERSION_2) {
			    /* If we are configured to send version 2 multicast packet */
			    /* to this target, do not reply to queries from sources */
			    /* that would not normally hear our multicasts */

			    if (!task_recv_dstaddr
				|| !sock2ip(task_recv_dstaddr)) {
				/* Systems earlier than BSD 4.3 Reno (and Reno itself without */
				/* a bug fix) do not report the destination address of UDP */
				/* packets.  In this case it is not possible to determine if */
				/* a V2 requests was multicast, so to be safe we will not */
				/* even reply to version 2 requests unless we can determine */
				/* that it was multicast */

				REJECT(0, "unable to verify that sender is fully RIP v2 capable");
			    }

			    if (!sockaddrcmp(task_recv_dstaddr, rip_addr_mc)) {
				/* Request was not multicast */

				REJECT(0, "not configured for RIP-1 compatiblity");
			    }
			}
#endif	/* IP_MULTICAST */
		    }
		}

		if (!auth) {
		    /* Authenticate as a user query */

		    if (rip_auth_check(inripmsg,
				       &nets,
				       &limit,
				       gwp,
				       rip_auth_query,
				       (struct rip_authinfo *) 0)) {
			/* Success - indicate the type we reply with */

			auth = rip_auth_query;
		    } else {
			/* Failed */

			pri = BIT_TEST(gwp->gw_flags, GWF_AUTHFAIL) ? 0 : LOG_WARNING;
			BIT_SET(gwp->gw_flags, GWF_AUTHFAIL);
			REJECT(pri, "authentication failure");
		    }
		}
		
		if (((byte *) limit - (byte *) nets) % sizeof *nets) {
		    REJECT(0, "not an even multiple of network entry size");
		}

		BIT_SET(gwp->gw_flags, GWF_QUERY | GWF_ACCEPT);

		rip_recv_request(tp,
				 task_recv_srcaddr,
				 ifap,
				 tlp,
				 inripmsg,
				 nets,
				 limit,
				 poll,
				 auth);
	    }
	    continue;

	case RIPCMD_TRACEON:
	case RIPCMD_TRACEOFF:
	    if (!OK) {
		REJECT(0, "not on trustedgateways list");
	    }
	    if (ntohs(sock2port(task_recv_srcaddr)) > IPPORT_RESERVED) {
		REJECT(0, "not from a trusted port");
	    }
	    if (!(ifap = if_withdst(gwp->gw_addr))) {
		REJECT(0, "not on same net");
	    }
	    if (BIT_TEST(ifap->ifa_ps[tp->task_rtproto].ips_state, IFPS_NOIN)) {
		REJECT(0, "not listening to RIP on this interface");
	    }
	    REJECT(LOG_NOTICE, "TRACE packets not supported");

	case RIPCMD_POLLENTRY:
	    /* BSD 4.3 Reno has a bug causing the address to be zero */
	    if (task_recv_dstaddr
		&& sock2ip(task_recv_dstaddr)
#ifdef	IP_MULTICAST
		&& !sockaddrcmp(task_recv_dstaddr, rip_addr_mc)
#endif	/* IP_MULTICAST */
		) {
		/* On some systems we can find the destination address of the packet */
		ifap = if_withlcladdr(task_recv_dstaddr, TRUE);
		if (!ifap) {
		    REJECT(0, "can not find interface for source address");
		}
	    } else {
		ifap = if_withdst(gwp->gw_addr);
		if (!ifap) {
		    /* This host does not share a network */
		    rt_entry *rt;
			    
		    rt = rt_lookup(RTS_NETROUTE,
				   (flag_t) 0,
				   gwp->gw_addr,
				   RTPROTO_BIT_ANY);

		    if (!rt) {
			REJECT(0, "can not find interface for route");
		    }
		    ifap = RT_IFAP(rt);
		}
	    }
	    BIT_SET(gwp->gw_flags, GWF_QUERY | GWF_ACCEPT);
	    if (rip_auth_query
		&& ntohs(rip_auth_query->auth_type) != RIP_AUTH_NONE) {
		/* Authentication failure */
		
		pri = BIT_TEST(gwp->gw_flags, GWF_AUTHFAIL) ? 0 : LOG_WARNING;
		BIT_SET(gwp->gw_flags, GWF_AUTHFAIL);
		REJECT(pri, "authentication failure");
	    }
	    rip_recv_pollentry(tp, task_recv_srcaddr, ifap, inripmsg);
	    continue;

	case RIPCMD_RESPONSE:
	    if (!(ifap = if_withdst(gwp->gw_addr))) {
		REJECT(0, "not on same net");
	    }
	    /* If this packet is addressed from us, flag the interface as up and ignore the packet */
	    if (sockaddrcmp_in(gwp->gw_addr, ifap->ifa_addr_local)) {
		/* A packet from us */

		if (!BIT_TEST(ifap->ifa_state, IFS_SIMPLEX)) {
		    /* If this interface is not simplex, indicate that the media */
		    /* is functioning */
		    if_rtupdate(ifap);
		}

		/* Ignore the packet */
		continue;
	    }

	    /* update interface timer on interface that packet came in on. */
	    if_rtupdate(ifap);

	    if (!OK) {
#ifndef	notdef
		REJECT(0, "not on trustedgateways list");
#else	/* notdef */
		continue;
#endif	/* notdef */
	    }

	    if (sock2port(task_recv_srcaddr) != rip_port) {
		REJECT(0, "not from a trusted port");
	    }

	    if (BIT_TEST(ifap->ifa_ps[tp->task_rtproto].ips_state, IFPS_NOIN)) {
		REJECT(0, "interface marked for no RIP in");
	    }

	    /* Verify authentication */
	    if (!rip_auth_check(inripmsg,
				&nets,
				&limit,
				gwp,
				ifap ? (struct rip_authinfo *) ifap->ifa_rip_auth : (struct rip_authinfo *) 0,
				ifap ? (struct rip_authinfo *) ifap->ifa_rip_auth2 : (struct rip_authinfo *) 0)) {
		/* Failed */

		pri = BIT_TEST(gwp->gw_flags, GWF_AUTHFAIL) ? 0 : LOG_WARNING;
		BIT_SET(gwp->gw_flags, GWF_AUTHFAIL);
		REJECT(pri, "authentication failure");
	    }
		
	    if (((byte *) limit - (byte *) nets) % sizeof *nets) {
		REJECT(0, "not an even multiple of network entry size");
	    }

	    BIT_SET(gwp->gw_flags, GWF_ACCEPT);
	    gwp->gw_time = time_sec;

	    rip_recv_response(tp,
			      gwp,
			      task_recv_srcaddr,
			      ifap,
			      inripmsg,
			      nets,
			      limit);
#if   defined(PROTO_SNMP) && defined(MIB_RIP)
	    if (gwp) {
		gwp->gw_last_version_received =    /* save rip version for */
		inripmsg->rip_vers;         /* message from gateway */
	    }
#endif        /* PROTO_SNMP && MIB_RIP */
	    break;

	default:
	    pri = BIT_TEST(gwp->gw_flags, GWF_FORMAT) ? 0 : LOG_WARNING;
	    BIT_SET(gwp->gw_flags, GWF_FORMAT);
	    REJECT(0, "invalid or not implemented command");
	}
	continue;

    Reject:
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
	if (gwp) {
	    ifap = if_withdst(gwp->gw_addr);
	    if (ifap && !BIT_TEST(ifap->ifa_ps[tp->task_rtproto].ips_state, IFPS_NOIN)) {
		volatile u_int *rip_bad_packets = (u_int *) &ifap->ifa_rip_bad_packets;
		*rip_bad_packets++;
	    }
	    gwp->gw_bad_packets++;
	}
#endif	/* PROTO_SNMP && MIB_RIP */
	tracef("rip_recv: ignoring RIP ");
	if (inripmsg->rip_cmd < RIPCMD_MAX) {
	    tracef("%s",
		   trace_state(rip_cmd_bits, inripmsg->rip_cmd));
	} else {
	    tracef("#%d",
		   inripmsg->rip_cmd);
	}
	trace_log_tp(tp,
		     0,
		     pri,
		     (" packet from %#A - %s",
		      task_recv_srcaddr,
		      reject_msg));
	trace_only_tp(tp,
		      0,
		      (NULL));
	if (gwp) {
	    BIT_SET(gwp->gw_flags, GWF_REJECT);
	}
    }
}

/**/
/*
 *	Deal with interface policy
 */
static void
rip_control_reset __PF2(tp, task *,
			ifap, if_addr *)
{
    struct ifa_ps *ips = &ifap->ifa_ps[tp->task_rtproto];

    BIT_RESET(ips->ips_state, IFPS_RESET);
    ips->ips_metric_in = ifap->ifa_metric + RIP_HOP;
    ips->ips_metric_out = (metric_t) 0;
    ifap->ifa_rip_auth = ifap->ifa_rip_auth2 = (void_t) 0;
}


static void
rip_control_set __PF2(tp, task *,
		      ifap, if_addr *)
{
    struct ifa_ps *ips = &ifap->ifa_ps[tp->task_rtproto];
    config_entry **list = config_resolv_ifa(rip_int_policy,
					    ifap,
					    RIP_CONFIG_MAX);

    /* Reset */
    rip_control_reset(tp, ifap);

    /* Set defaults */
    switch (BIT_TEST(ifap->ifa_state, IFS_POINTOPOINT|IFS_LOOPBACK|IFS_BROADCAST)) {
    case IFS_LOOPBACK:
	/* By default we do not send or listen on the loopback */
	/* interface.  This does not prevent us from processing */
	/* diagnostic POLL and REQUEST packets. */
	BIT_SET(ips->ips_state, IFPS_NOIN|IFPS_NOOUT);
	break;

    case IFS_POINTOPOINT:
	/* By default we do not send RIP out a P2P interface. */
	BIT_SET(ips->ips_state, IFPS_NOOUT);
	break;

    case IFS_BROADCAST:
    default:
	/* On broadcast and NBMA interfaces we default to sending and */
	/* receiving responses. */
	break;
    }

    /* Process configuration info */
    if (list) {
	int type = RIP_CONFIG_MAX;
	config_entry *cp;

	/* Fill in the parameters */
	while (--type) {
	    if ((cp = list[type])) {
		switch (type) {
		case RIP_CONFIG_IN:
		    if (GA2S(cp->config_data)) {
			BIT_RESET(ips->ips_state, IFPS_NOIN);
		    } else {
			BIT_SET(ips->ips_state, IFPS_NOIN);
		    }
		    break;

		case RIP_CONFIG_OUT:
		    if (GA2S(cp->config_data)) {
			BIT_RESET(ips->ips_state, IFPS_NOOUT);
		    } else {
			BIT_SET(ips->ips_state, IFPS_NOOUT);
		    }
		    break;

		case RIP_CONFIG_METRICIN:
		    BIT_SET(ips->ips_state, IFPS_METRICIN);
		    ips->ips_metric_in = (metric_t) GA2S(cp->config_data);
		    break;

		case RIP_CONFIG_METRICOUT:
		    BIT_SET(ips->ips_state, IFPS_METRICOUT);
		    ips->ips_metric_out = (metric_t) GA2S(cp->config_data);
		    break;

		case RIP_CONFIG_FLAG:
		    BIT_SET(ips->ips_state, (flag_t) GA2S(cp->config_data));
		    break;

		case RIP_CONFIG_AUTH:
		    /* Primary authentication */
		    ifap->ifa_rip_auth = cp->config_data;
		    break;

		case RIP_CONFIG_AUTH2:
		    /* Secondary authentication */
		    ifap->ifa_rip_auth2 = cp->config_data;
		    break;
		}
	    }
	}

	config_resolv_free(list, RIP_CONFIG_MAX);
    }
}


void
rip_config_free __PF1(cp, config_entry *)
{
    switch (cp->config_type) {
    case RIP_CONFIG_AUTH:
    case RIP_CONFIG_AUTH2:
	if ((struct rip_authinfo *) cp->config_data != &rip_auth_none) {
	    task_block_free(rip_auth_block_index, cp->config_data);
	}
	break;
	
    default:
	/* Not allocated */
	break;
    }
}


/*
 *	Cleanup before re-init
 */
/*ARGSUSED*/
static void
rip_cleanup __PF1(tp, task *)
{
    adv_cleanup(RTPROTO_RIP,
		&rip_n_trusted,
		&rip_n_source,
		rip_gw_list,
		&rip_int_policy,
		&rip_import_list,
		&rip_export_list);

    if (rip_auth_query
	&& rip_auth_query != &rip_auth_none) {
	task_block_free(rip_auth_block_index, (void_t) rip_auth_query);
	rip_auth_query = (struct rip_authinfo *) 0;
    }
    
#ifdef	IP_MULTICAST
    if (rip_multicast_ifap) {
	IFA_FREE(rip_multicast_ifap);
	rip_multicast_ifap = (if_addr *) 0;
    }
#endif	/* IP_MULTICAST */

    if (tp) {
	trace_freeup(tp->task_trace);
    }
    trace_freeup(rip_trace_options);
}


static void
rip_exit __PF1(tp, task *)
{
    gw_entry *gwp;
    if_addr *ifap;

    /* Release the target list, bit assignments, and buffers */
    target_free_list(tp, &rip_targets);

    /* Reset the policy */
    IF_ADDR(ifap) {
	if (socktype(ifap->ifa_addr) == AF_INET) {
	    rip_control_reset(tp, ifap);
	}
    } IF_ADDR_END(ifap) ;

    rt_open(tp);

    GW_LIST(rip_gw_list, gwp) {
	rt_entry *rt;

	RTQ_LIST(&gwp->gw_rtq, rt) {
	    rt_delete(rt);
#if   defined(PROTO_SNMP) && defined(MIB_RIP)
	    rip_global_changes++;
#endif	/* PROTO_SNMP && MIB_RIP */
	} RTQ_LIST_END(&gwp->gw_rtq, rt) ;
    } GW_LIST(rip_gw_list, gwp) ;

    rt_close(tp, (gw_entry *) 0, 0, NULL);

    rip_cleanup(tp);

#ifdef	IP_MULTICAST
    if (rip_addr_mc) {
	/* Initialize address constant */

	sockfree(rip_addr_mc);
	rip_addr_mc = (sockaddr_un *) 0;
    }
#endif	/* IP_MULTICAST */

    task_delete(tp);
    rip_timer_update = rip_timer_flash = rip_timer_age = (task_timer *) 0;
}


/*
 *	Evaluate policy for changed routes.
 */
static int
rip_policy __PF3(tp, task *,
		 tlp, target *,
		 change_list, rt_list *)
{
    if_addr *ifap = tlp->target_ifap;
    u_long if_net = inet_net_natural(ifap->ifa_addr);
    int same_net = if_net == inet_net_natural(ifap->ifa_addr_local);
    int changes = 0;
    int logged = 0;
    rt_head *rth;
    struct ifa_ps *ips = &ifap->ifa_ps[tp->task_rtproto];

    RT_LIST(rth, change_list, rt_head) {
	register rt_entry *new_rt = rth->rth_active;
	adv_results result;
	td_entry *tdp;
	int exportable = FALSE;
	int changed = 0;
	int move_bit = 0;
	int holddown = 0;
	int poison = 0;
	int set_metric = 0;

	TD_TSI_GET(tlp, rth, tdp);

	/* Can we announce the new route (if there is one)? */
	if (new_rt) {
	    
	    if (socktype(new_rt->rt_dest) != AF_INET) {
		goto no_export;
	    }
	    
	    if (BIT_TEST(new_rt->rt_state, RTS_NOADVISE|RTS_GROUP)) {
		/* Absolutely not */

		goto no_export;
	    }

	    if (RT_IFAP(new_rt) == ifap &&
		new_rt->rt_gwp->gw_proto == RTPROTO_DIRECT) {
		/* Do not send interface routes back to the same interface */

		goto no_export;
	    }

	    if (RT_IFAP(new_rt) == ifap
		&& sockaddrcmp(RT_ROUTER(new_rt),
			       *tlp->target_dst)) {
		/* Sending a route back to the router you are using could */
		/* cause a routing loop */

		goto no_export;
	    }

	    /* RIP version 2 sends everything everywhere by default */
	    if (!BIT_TEST(tlp->target_flags, RIPTF_V2MC)) {
		/* RIP version 1 target */

		/* Host routes go everywhere, subnets and nets may need to be restricted */
		if (new_rt->rt_dest_mask != inet_mask_host) {
		    sockaddr_un *natural_mask = inet_mask_natural(new_rt->rt_dest);

		    if (new_rt->rt_dest_mask > natural_mask) {
			/* This is a subnet */

			if (!same_net
			    || (sock2ip(rth->rth_dest) & sock2ip(natural_mask)) != if_net) {
			    /* Only send subnets to interfaces of the same network */
			
			    goto no_export;
			}
			if (rth->rth_dest_mask != ifap->ifa_netmask) {
			    /* Only send subnets that have the same mask */

			    goto no_export;
			}
		    } else if (sock2ip(rth->rth_dest) == if_net) {
			/* Do not send the whole net to a subnet */

			goto no_export;
		    }
		}
	    }

	    if ((new_rt->rt_gwp->gw_proto == tp->task_rtproto) && (ifap == RT_IFAP(new_rt))) {
		/* Split horizon */
		goto no_export;
	    }

	    if (RT_IFAP(new_rt)
		&& !BIT_TEST(RT_IFAP(new_rt)->ifa_state, IFS_UP)) {
		/* The interface is down */
		goto no_export;
	    }

	    /* Assign default metric */
	    if (new_rt->rt_gwp->gw_proto == RTPROTO_AGGREGATE) {
		/* Originate aggregates with a metric of one */

		result.res_metric = RIP_HOP;
	    } else if (!RT_IFAP(new_rt)
		|| (BIT_TEST(RT_IFAP(new_rt)->ifa_state, IFS_LOOPBACK) &&
		   sock2ip(RT_IFAP(new_rt)->ifa_addr) == INADDR_LOOPBACK)) {
		/* Routes via the loopback interface must have an explicit metric */ 

		result.res_metric = RIP_METRIC_UNREACHABLE;
	    } else if (new_rt->rt_gwp->gw_proto == RTPROTO_DIRECT) {
		/* Interface routes */

		if (BIT_TEST(RT_IFAP(new_rt)->ifa_state, IFS_POINTOPOINT)) {
		    /* Add a hop for the P2P link */

		    result.res_metric = RIP_HOP * 2;
		} else {
		    /* Default to one hop */

		    result.res_metric = RIP_HOP;
		}
	    } else {
		/* Use configured default metric */

		result.res_metric = rip_default_metric;
	    }

		
	    if (!export(new_rt,
			tp->task_rtproto,
			rip_export_list,
			ips->ips_export,
			tlp->target_gwp ? tlp->target_gwp->gw_export : (adv_entry *) 0,
			&result)) {
		/* Policy prohibits announcement */

		goto no_export;
	    } else {
		/* Add the interface metric */
		    
		result.res_metric += ips->ips_metric_out;
	    }

	    if (result.res_metric < RIP_METRIC_UNREACHABLE) {
		exportable = TRUE;
	    }

	no_export: ;
	}


	/* Now that we have determined the exportablility of the new */
	/* route we decide what changed need to be made.  The */
	/* complexity is required to surpress routing loops both */
	/* within RIP and between RIP and other protocols. */

	/* There are two types of holddowns used, the first one is */
	/* called HOLDDOWN and is used when a route goes away or is */
	/* overridden by a route that is not suspected to be an echo */
	/* of a route we are announcing.  The second is called POISON */
	/* and is used when a route is overridden by a route suspected */
	/* to be an echo of a route we are announcing. */

	if (!tdp) {
	    /* New route */

	    if (exportable) {
		/* and it is exportable */
		
		/* Allocate new entry and fill it in */
		TD_ALLOC(tdp);
		TD_TSI_SET(tlp, rth, tdp);
		tdp->td_rt = new_rt;
		rtbit_set(tdp->td_rt, tlp->target_rtbit);
		TD_ENQUE(tlp, tdp);
		set_metric++;
		changes++;
	    }
	} else if (!new_rt) {
	    /* No new route, just an old one */
	
	    if (!BIT_TEST(tdp->td_flags, TDF_POISON|TDF_HOLDDOWN)) {
		if (BIT_TEST(tdp->td_rt->rt_state, RTS_DELETE|RTS_HIDDEN)) {
		    /* Put into holddown */

		    holddown++;
		    changed++;
		} else {
		    /* Poison the old route */

		    poison++;
		    changed++;
		}
	    }
	} else if (new_rt == tdp->td_rt) {
	    /* Something has changed with the route we are announcing */

	    if (BIT_TEST(tdp->td_flags, TDF_POISON|TDF_HOLDDOWN)) {
		if (exportable) {
		    set_metric++;
		    changed++;
		}
	    } else {
		if (!exportable) {
		    poison++;
		    changed++;
		} else if (tdp->td_metric != result.res_metric) {
		    set_metric++;
		    changed++;
		}
	    }
	} else if (!BIT_TEST(new_rt->rt_state, RTS_PENDING)) {
	    /* The new route is not from a holddown protocol */
	    
	    if (exportable
		&& (BIT_TEST(new_rt->rt_gwp->gw_flags, GWF_NOHOLD)
		    || BIT_TEST(tdp->td_rt->rt_gwp->gw_flags, GWF_NOHOLD))) {
		    /* The new route is a ``static'' route or the old route */
		    /* is a ``static'' route, override immediately */
		    
		set_metric++;
		changed++;
		move_bit++;
	    } else if (BIT_TEST(tdp->td_flags, TDF_HOLDDOWN)
		&& !BIT_TEST(tdp->td_rt->rt_gwp->gw_flags, GWF_NEEDHOLD)
		&& !BIT_TEST(new_rt->rt_gwp->gw_flags, GWF_NEEDHOLD)) {
		/* No changes necessary */

		changed = move_bit = 0;
	    } else if (!BIT_TEST(tdp->td_flags, TDF_POISON|TDF_HOLDDOWN)) {
		/* Previously active, has been deleted */

		holddown++;
		changed++;
	    } else {
		if (exportable) {
		    set_metric++;
		    changed++;
		} else {
		    if (!BIT_TEST(tdp->td_flags, TDF_POISON)) {
			poison++;
			changed++;
		    }
		}
		move_bit++;
	    }
	} else {
	    /* New route is just better */

	    if (BIT_TEST(tdp->td_rt->rt_state, RTS_DELETE|RTS_HIDDEN)) {
		if (!BIT_TEST(tdp->td_flags, TDF_HOLDDOWN)) {
		    holddown++;
		    changed++;
		}
	    } else {
		if (!BIT_TEST(tdp->td_flags, TDF_POISON)) {
		    poison++;
		    changed++;
		}

		move_bit++;
	    }
	}

	if ((changed || set_metric)
	    && TRACE_TP(tp, TR_POLICY)) {
	    if (!logged) {
		logged++;
		trace_only_tp(tp,
			      TRC_NL_BEFORE,
			      ("rip_policy: Policy for target %A%s",
			       *tlp->target_dst,
			       BIT_TEST(tlp->target_flags, RIPTF_V2MC) ? "mc " : ""));
	    }
	    tracef("\t%A/%A ",
		   rth->rth_dest,
		   rth->rth_dest_mask);
	}
	if (set_metric) {
	    target_set_metric(tdp, result.res_metric);
	    trace_tp(tp,
		     TR_POLICY,
		     0,
		     ("metric %u",
		      tdp->td_metric));
	} else if (holddown) {
	    target_set_holddown(tdp, RIP_HOLDCOUNT);
	    trace_tp(tp,
		     TR_POLICY,
		     0,
		     ("starting holddown"));
	} else if (poison) {
	    target_set_poison(tdp, RIP_HOLDCOUNT);
	    trace_tp(tp,
		     TR_POLICY,
		     0,
		     ("starting poison"));
	} else if (TRACE_TP(tp, TR_POLICY)) {
	    trace_clear();
	}
	
	if (changed) {
	    /* Changed entries need to be at the head of the queue to */
	    /* make triggered updates quick */

	    TD_DEQUE(tdp);
	    TD_ENQUE(tlp, tdp);
	    changes++;
	}

	if (move_bit) {
	    /* Move lock to new route */

	    rtbit_set(new_rt, tlp->target_rtbit);
	    (void) rtbit_reset(tdp->td_rt, tlp->target_rtbit);
	    tdp->td_rt = new_rt;
	}
    } RT_LIST_END(rth, change_list, rt_head) ;

    if (logged) {
	trace_tp(tp,
		 TR_POLICY,
		 0,
		 (NULL));
    }

    return changes;
}


/*
 *	send RIP packets
 */
/*ARGSUSED*/
static void
rip_job __PF2(tip, task_timer *,
	      interval, time_t)
{
    target *tlp;
    
    TARGET_LIST(tlp, &rip_targets) {
	if (BIT_TEST(tlp->target_flags, TARGETF_SUPPLY)) {
	    (void) rip_supply(tlp,
#ifdef	IP_MULTICAST
			      BIT_TEST(tlp->target_flags, RIPTF_V2MC) ? rip_addr_mc :
#endif	/* IP_MULTICAST */
			      *tlp->target_dst,
			      tlp->target_flags,
			      MSG_DONTROUTE,
			      FALSE,
			      tlp->target_ifap->ifa_rip_auth);
	}
    } TARGET_LIST_END(tlp, &rip_targets) ;

    /* Indicate that flash updates are possible as soon as the timer fires */
    BIT_RESET(rip_flags, RIPF_NOFLASH|RIPF_FLASHDUE);
    task_timer_set(rip_timer_flash, RIP_T_FLASH, (time_t) 0);
}


/*
 *	send a flash update packet
 */
/*ARGSUSED*/
static void
rip_do_flash __PF2(tip, task_timer *,
		   interval, time_t)
{
    static int term_updates = 4;
    task *tp = tip->task_timer_task;

    if (BIT_TEST(rip_flags, RIPF_FLASHDUE|RIPF_TERMINATE)) {
	int count = 0;
	target *tlp;

	trace_tp(tp,
		 TR_TASK,
		 0,
		 ("rip_do_flash: Doing flash update for RIP"));

	TARGET_LIST(tlp, &rip_targets) {
	    if (BIT_TEST(tlp->target_flags, TARGETF_SUPPLY)) {
		count += rip_supply(tlp,
#ifdef	IP_MULTICAST
				    BIT_TEST(tlp->target_flags, RIPTF_V2MC) ? rip_addr_mc :
#endif	/* IP_MULTICAST */
				    *tlp->target_dst,
				    tlp->target_flags,
				    MSG_DONTROUTE,
				    !BIT_TEST(rip_flags, RIPF_TERMINATE),
				    tlp->target_ifap->ifa_rip_auth);
	    }
	} TARGET_LIST_END(tlp, &rip_targets) ;

	trace_tp(tp,
		 TR_TASK,
		 0,
		 ("rip_do_flash: Flash update done"));

	if (BIT_TEST(rip_flags, RIPF_TERMINATE) && (!count || !--term_updates)) {
	    /* Sent the requisite number of updates or nothing to send */
	    rip_exit(tp);
	    return;
	}

	/* Indicate no flash update is due */
	BIT_RESET(rip_flags, RIPF_FLASHDUE);

	/* Schedule the next flash update */
	if (BIT_TEST(rip_flags, RIPF_TERMINATE) ||
	    time_sec + RIP_T_MIN + RIP_T_MAX < rip_timer_update->task_timer_next_time) {
	    /* We can squeeze another flash update in before the full update */

	    task_timer_set(tip, RIP_T_FLASH, (time_t) 0);
	} else {
	    /* The next flash update will be scheduled after the next full update */

	    task_timer_reset(tip);
	    BIT_SET(rip_flags, RIPF_NOFLASH);
	}
    } else {
	task_timer_reset(tip);
    }
}


/*
 *	Do or schedule a flash update
 */
static void
rip_need_flash __PF1(tp, task *)
{
    task_timer *tip = rip_timer_flash;

    if (!tip) {
	BIT_RESET(rip_flags, RIPF_FLASHDUE);
	return;
    }
    
    /* Indicate we need a flash update */
    BIT_SET(rip_flags, RIPF_FLASHDUE);

    /* And see if we can do it now */
    if (BIT_TEST(tip->task_timer_flags, TIMERF_INACTIVE)
	&& !BIT_TEST(rip_flags, RIPF_NOFLASH)) {
	/* Do it now */

	rip_do_flash(tip, (time_t) 0);
    }
}


/*
 *	Process changes in the routing table.
 */
static void
rip_flash __PF2(tp, task *,
		change_list, rt_list *)
{
    int changes = 0;
    target *tlp;
    
    /* Re-evaluate policy */
    rt_open(tp);

    TARGET_LIST(tlp, &rip_targets) {
	if (BIT_TEST(tlp->target_flags, TARGETF_SUPPLY)) {
	    changes += rip_policy(tp, tlp, change_list);
	}
    } TARGET_LIST_END(tlp, &rip_targets) ;
    
    /* Close the table */
    rt_close(tp, (gw_entry *) 0, 0, NULL);

    if (changes) {
	/* Schedule a flash update */

	rip_need_flash(tp);
    }
}


/*
 *	Re-evaluate routing table
 */
static void
rip_newpolicy __PF2(tp, task *,
		    change_list, rt_list *)
{
    /* Indicate reconfig done */
    BIT_RESET(rip_flags, RIPF_RECONFIG);

    /* And evaluate policy */
    rip_flash(tp, change_list);
}


/*
 *  Age out RIP routes
 */
static void
rip_age __PF2(tip, task_timer *,
	      interval, time_t)
{
    time_t expire_to = time_sec - RIP_T_EXPIRE;
    time_t nexttime = time_sec + 1;

    if (expire_to > 0) {
	gw_entry *gwp;

	rt_open(tip->task_timer_task);
    
	GW_LIST(rip_gw_list, gwp) {
	    rt_entry *rt;

	    if (gwp->gw_n_routes) {
		/* No routes for this gateway */

		if (!gwp->gw_import
		    && !gwp->gw_export
		    && !BIT_TEST(gwp->gw_flags, GWF_SOURCE|GWF_TRUSTED)) {
		    /* No routes, delete this gateway */

		    /* XXX */
		}
		continue;
	    }

	    /* Age any routes for this gateway */
	    RTQ_LIST(&gwp->gw_rtq, rt) {
		if (rt->rt_time <= expire_to) {
		    /* This route has expired */
		
		    rt_delete(rt);
#if   defined(PROTO_SNMP) && defined(MIB_RIP)
		    rip_global_changes++;
#endif	/* PROTO_SNMP && MIB_RIP */
		} else {
		    /* This is the next route to expire */
		    if (rt->rt_time < nexttime) {
			nexttime = rt->rt_time;
		    }
		    break;
		}
	    } RTQ_LIST_END(&gwp->gw_rtq, rt) ;
	} GW_LIST_END(rip_gw_list, gwp) ;

	rt_close(tip->task_timer_task, (gw_entry *) 0, 0, NULL);
    }

    if (nexttime > time_sec) {
	/* No routes to expire */

	nexttime = time_sec;
    }

    task_timer_set(tip, (time_t) 0, nexttime + RIP_T_EXPIRE - time_sec);
}


/*
 *	Initialize static variables
 */
void
rip_var_init()
{
    rip_flags = RIPF_ON|RIPF_CHOOSE;

    rip_default_metric = RIP_METRIC_UNREACHABLE;
    rip_preference = RTPREF_RIP;

    /* Set up interface bits to be printed */
    int_ps_bits[RTPROTO_RIP] = rip_if_bits;

    /* Set up authentication block type */
    if (!rip_auth_block_index) {
	rip_auth_block_index = task_block_init(sizeof (struct rip_authinfo),
					       "rip_rip_authinfo");

	/* Init the null authentication block */
	rip_auth_none.auth_family = htons(RIP_AF_AUTH);
	rip_auth_none.auth_type = htons(RIP_AUTH_NONE);
	rip_auth_none.auth_data[0] = rip_auth_none.auth_data[1]
	    = rip_auth_none.auth_data[2] = rip_auth_none.auth_data[3] = (u_int32) 0;
    }
}



static void
rip_tsi_dump __PF4(fp, FILE *,
		   rth, rt_head *,
		   data, void_t,
		   pfx, const char *)
{
    target *tlp = (target *) data;
    td_entry *tdp;

    TD_TSI_GET(tlp, rth, tdp);

    if (tdp) {
	if (BIT_TEST(tdp->td_flags, TDF_HOLDDOWN|TDF_POISON)) {
	    (void) fprintf(fp,
			   "%sRIP %A%s <%s> remaining %#T",
			   pfx,
			   *tlp->target_dst,
			   BIT_TEST(tlp->target_flags, RIPTF_V2MC) ? "mc " : "",
			   trace_bits(target_entry_bits, tdp->td_flags),
			   tdp->td_metric * RIP_T_UPDATE);
	} else {
	    (void) fprintf(fp,
			   "%sRIP %A%s <%s> metric %u",
			   pfx,
			   *tlp->target_dst,
			   BIT_TEST(tlp->target_flags, RIPTF_V2MC) ? "mc " : "",
			   trace_bits(target_entry_bits, tdp->td_flags),
			   tdp->td_metric);
	}
    }
    
    return;
}


/*
 *	Update the target list
 */
static void
rip_target_list __PF1(jp, task_job *)
{
    register task *tp = jp->task_job_task;
    int targets;
    target *tlp;
    flag_t target_flags = TARGETF_ALLINTF;
    static int n_targets, n_source;

    /* If broadcast/nobroadcast not specified, figure out if we */
    /* need to broadcast packets */
    if (BIT_TEST(rip_flags, RIPF_CHOOSE)) {
	if (if_n_addr[AF_INET].up > 1
	    && inet_ipforwarding) {

	    BIT_SET(rip_flags, RIPF_BROADCAST);
	} else {

	    BIT_RESET(rip_flags, RIPF_BROADCAST);
	}
    }

    if (!rip_timer_age) {
        /* Create route age timer */

        rip_timer_age = task_timer_create(tp,
					  "Age",
					  (flag_t) 0,
					  (time_t) 0,
					  RIP_T_EXPIRE,
					  rip_age,
					  (void_t) 0);
    }

    if (BIT_TEST(rip_flags, RIPF_SOURCE|RIPF_BROADCAST)) {
	/* We are supplying updates */

	/* Gateways do not listen to redirects */
	redirect_disable(tp->task_rtproto);
	
	/* Make sure the timers are active */
	if (!rip_timer_update) {
	    /* Create the update timer */

	    rip_timer_update = task_timer_create(tp,
						 "Update",
						 0,
						 (time_t) RIP_T_UPDATE,
						 (time_t) RIP_T_MAX,
						 rip_job,
						 (void_t) 0);
	}

	if (!rip_timer_flash) {
	    /* Create flash update timer */

	    rip_timer_flash = task_timer_create(tp,
						"Flash",
						(flag_t) 0,
						(time_t) RIP_T_FLASH,
						(time_t) RIP_T_MAX,
						rip_do_flash,
						(void_t) 0);
	}
    } else {
	/* We are not supplying updates */
	
	/* Hosts do listen to redirects */
	redirect_enable(tp->task_rtproto);

	/* Make sure the timers do not exist */
	if (rip_timer_update) {
	    task_timer_delete(rip_timer_update);
	    rip_timer_update = (task_timer *) 0;
	}

	if (rip_timer_flash) {
	    task_timer_delete(rip_timer_flash);
	    rip_timer_flash = (task_timer *) 0;
	}
    }

    
    /* Set flags for target list build */
    if (BIT_TEST(rip_flags, RIPF_BROADCAST)) {
	BIT_SET(target_flags, TARGETF_BROADCAST);
    }
    if (BIT_TEST(rip_flags, RIPF_SOURCE)) {
	BIT_SET(target_flags, TARGETF_SOURCE);
    }

    /* Build or update target list */
    targets = target_build(tp,
			   &rip_targets,
			   rip_gw_list,
			   target_flags,
			   rip_tsi_dump);

#ifdef	IP_MULTICAST
    TARGET_LIST(tlp, &rip_targets) {
	/* Enable or disable v1 compatible v2 extensions */
	if (BIT_TEST(tlp->target_ifap->ifa_ps[tp->task_rtproto].ips_state, RIP_IFPS_V2BC)) {
	    BIT_SET(tlp->target_flags, RIPTF_V2BC);
	} else {
	    BIT_RESET(tlp->target_flags, RIPTF_V2BC);
	}

	if (BIT_TEST(tlp->target_flags, TARGETF_BROADCAST)
	    && BIT_TEST(tlp->target_ifap->ifa_state, IFS_MULTICAST)
	    && BIT_TEST(tlp->target_ifap->ifa_state, IFS_BROADCAST|IFS_POINTOPOINT)) {
	    /* Enable transmission and reception of packets to the RIP multicast group */

	    if (BIT_TEST(tlp->target_ifap->ifa_ps[tp->task_rtproto].ips_state, RIP_IFPS_V2MC)
		&& rip_mc_set(tp, tlp)) {
		/* Interface is MC capable and sending of V2 packets requested */

		BIT_SET(tlp->target_flags, RIPTF_V2MC);
	    } else {
		/* Can not send MC V2 packets */

		BIT_RESET(tlp->target_flags, RIPTF_V2MC);
	    }
	}

	if (tlp->target_ifap->ifa_rip_auth) {
	    switch (BIT_TEST(tlp->target_flags, RIPTF_V2)) {
	    case RIPTF_V2MC:
		break;
		
	    case RIPTF_V2BC:
		trace_log_tp(tp,
			     0,
			     LOG_WARNING,
			     ("rip_target_list: %A (%s): authentication not recommended w/o multicast",
			      *tlp->target_dst,
			      tlp->target_ifap->ifa_link->ifl_name));
		break;
		
	    default:
		trace_log_tp(tp,
			     0,
			     LOG_WARNING,
			     ("rip_target_list: %A (%s): ignoring authentication",
			      *tlp->target_dst,
			      tlp->target_ifap->ifa_link->ifl_name));
		break;
	    }
	}
    } TARGET_LIST_END(tlp, &rip_targets) ;
#endif	/* IP_MULTICAST */

    /* Send a RIP REQUEST for everyone's routing table */
    if (!BIT_TEST(task_state, TASKS_TEST)) {
	byte buffer[sizeof (struct rip) + sizeof (struct rip_netinfo)
		    + sizeof (struct rip_authinfo) + sizeof (struct rip_trailer)];
	struct rip *ripmsg = (struct rip *) ((void_t) buffer);
	struct rip_authinfo *auth, *ap;

	bzero((caddr_t) buffer, sizeof buffer);
	ripmsg->rip_cmd = RIPCMD_REQUEST;

	TARGET_LIST(tlp, &rip_targets) {
	    struct rip_netinfo *nets = (struct rip_netinfo *) ((void_t) (ripmsg + 1));

	    if ((BIT_TEST(rip_flags, RIPF_RECONFIG)
		    || !BIT_TEST(tlp->target_flags, RIPTF_POLL))
		&& BIT_TEST(tlp->target_flags, TARGETF_BROADCAST)
		&& !BIT_TEST(tlp->target_ifap->ifa_ps[tp->task_rtproto].ips_state, IFPS_NOIN)) {
		/* Do a poll if one has not been done on this interface, */
		/* or we are reconfiguring */

		/* Set the version */
		if (BIT_TEST(tlp->target_flags, RIPTF_V2)) {
		    /* Set version 2 */
		    
		    ripmsg->rip_vers = RIP_VERSION_2;
		    ap = (struct rip_authinfo *) tlp->target_ifap->ifa_rip_auth;
		    if (ap && ntohs(ap->auth_type) != RIP_AUTH_NONE) {
			auth = (struct rip_authinfo *) nets++;
		    } else {
			ap = auth = (struct rip_authinfo *) 0;
		    }
		} else {
		    /* Set version 1 */
		    
		    ripmsg->rip_vers = RIP_VERSION_1;
		    ap = auth = (struct rip_authinfo *) 0;
		}
		bzero((caddr_t) nets, sizeof (*nets));
		nets->rip_family = htons(RIP_AF_UNSPEC);
		nets->rip_metric = htonl(RIP_METRIC_UNREACHABLE);

		rip_send(tp,
			 tlp->target_ifap,
			 MSG_DONTROUTE,
#ifdef	IP_MULTICAST
			 BIT_TEST(tlp->target_flags, RIPTF_V2MC) ? rip_addr_mc :
#endif	/* IP_MULTICAST */
			 *tlp->target_dst,
			 (void_t) ripmsg,
			 rip_auth_set(ripmsg, ap, auth, (size_t) ((byte *) (nets + 1) - (byte *) buffer)));
		BIT_SET(tlp->target_flags, RIPTF_POLL);
	    }
	} TARGET_LIST_END(tlp, &rip_targets) ;
    }

    /* Evaluate policy for new targets */
    {
	int changes = 0;
	int have_list = 0;
	rt_list *rthl = (rt_list *) 0;

	rt_open(tp);

	TARGET_LIST(tlp, &rip_targets) {
	    if (BIT_TEST(tlp->target_flags, TARGETF_BROADCAST)) {
		if (BIT_TEST(tlp->target_ifap->ifa_ps[tp->task_rtproto].ips_state, IFPS_NOIN)) {
		    gw_entry *gwp;

		    GW_LIST(rip_gw_list, gwp) {
			register rt_entry *rt;

			RTQ_LIST(&gwp->gw_rtq, rt) {
			    if (RT_IFAP(rt) == tlp->target_ifap) {
				rt_delete(rt);
#if   defined(PROTO_SNMP) && defined(MIB_RIP)
				rip_global_changes++;
#endif	/* PROTO_SNMP && MIB_RIP */
				changes++;
			    }
			} RTQ_LIST_END(&gwp->gw_rtq, rt) ;
		    } GW_LIST_END(rip_gw_list, gwp) ;
		}
	    }
	    switch (BIT_TEST(tlp->target_flags, TARGETF_POLICY|TARGETF_SUPPLY)) {
	    case TARGETF_SUPPLY:
		/* Need to run policy for this target */

		if (!have_list) {
		    /* Get target list */
		    rthl = rthlist_active(AF_INET);
		    have_list++;
		}

		if (rthl) {
		    /* and run policy */
		    changes += rip_policy(tp, tlp, rthl);
		}

		/* Indicate policy has been run */
		BIT_SET(tlp->target_flags, TARGETF_POLICY);
		break;

	    case TARGETF_POLICY:
		/* Indicate policy run on this target */

		BIT_RESET(tlp->target_flags, TARGETF_POLICY);
		break;

	    default:
		break;
	    }
	} TARGET_LIST_END(tlp, &rip_targets) ;

	if (rthl) {
	    RTLIST_RESET(rthl);
	}

	rt_close(tp, (gw_entry *) 0, 0, NULL);

	if (changes
	    && !BIT_TEST(rip_flags, RIPF_RECONFIG)) {
	    rip_need_flash(tp);
	}
    }

    if (targets != n_targets
	|| rip_n_source != n_source) {

	tracef("rip_target_list: ");
	if (targets) {
	    tracef("supplying updates to");
	    if (targets - rip_n_source) {
		tracef(" %d interface%s",
		       targets - rip_n_source,
		       (targets - rip_n_source) > 1 ? "s" : "");
	    }
	    if (rip_n_source) {
		tracef(" %d gateways",
		       rip_n_source);
	    }
	} else {
	    tracef("just listening");
	}	
	n_targets = targets;
	n_source = rip_n_source;
	trace_log_tp(tp,
		     TRC_NL_AFTER,
		     LOG_INFO,
		     (NULL));
    }

    rip_target_list_job = (task_job *) 0;
    /* XXX - Send a full update if anything has changed */
}


/*
 *	Reinit after parse
 */
/*ARGSUSED*/
static void
rip_reinit __PF1(tp, task *)
{
    int entries = 0;
    gw_entry *gwp;

    if (!rip_auth_query) {
	rip_auth_query = &rip_auth_none;
    }
    
    trace_set(tp->task_trace, rip_trace_options);

    /* Open the routing table */
    rt_open(tp);

    GW_LIST(rip_gw_list, gwp) {
	rt_entry *rt;

	RTQ_LIST(&gwp->gw_rtq, rt) {
	    pref_t preference = rip_preference;

	    /* Calculate preference of this route */
	    if (import(rt->rt_dest,
		       rt->rt_dest_mask,
		       rip_import_list,
		       RT_IFAP(rt)->ifa_ps[tp->task_rtproto].ips_import,
		       rt->rt_gwp->gw_import,
		       &preference,
		       RT_IFAP(rt),
		       (void_t) 0)) {
		if (rt->rt_preference != preference) {
		    /* The preference has changed, change the route */
		    (void) rt_change(rt,
				     rt->rt_metric,
				     rt->rt_metric2,
				     rt->rt_tag,
				     preference,
				     rt->rt_preference2,
				     rt->rt_n_gw, rt->rt_routers);
#if   defined(PROTO_SNMP) && defined(MIB_RIP)
			rip_global_changes++;
#endif	/* PROTO_SNMP && MIB_RIP */
		}
		entries++;
	    } else {
		/* This route is now restricted */
		rt_delete(rt);
	    }
	} RTQ_LIST_END(&gwp->gw_rtq, rt) ;
    } GW_LIST_END(rip_gw_list, gwp) ;

    /* Close the routing table */
    rt_close(tp, (gw_entry *) 0, entries, NULL);

    /* Indicate a reconfig in process */
    BIT_SET(rip_flags, RIPF_RECONFIG);
}


/*
 *	Terminating - clean up
 */
static void
rip_terminate __PF1(tp, task *)
{
    BIT_SET(rip_flags, RIPF_TERMINATE);
    
    if (BIT_TEST(rip_flags, RIPF_SOURCE|RIPF_BROADCAST)) {
	/* Disable receive */
	task_set_recv(tp, 0);
	task_set_socket(tp, tp->task_socket);
	task_timer_reset(rip_timer_update);

	/* Start shutdown procedure */
	rip_do_flash(rip_timer_flash, (time_t) 0);

	/* Make sure we don't try this again */
	task_set_terminate(tp, 0);
    } else {
	/* Not supplying, go away now */
	rip_exit(tp);
    }
}


/*
 *	Dump info about RIP
 */
static void
rip_int_dump __PF2(fd, FILE *,
		   list, config_entry *)
{
    register config_entry *cp;

    CONFIG_LIST(cp, list) {
	switch (cp->config_type) {
	case RIP_CONFIG_IN:
	    (void) fprintf(fd, " %sripin",
			   GA2S(cp->config_data) ? "" : "no");
	    break;

	case RIP_CONFIG_OUT:
	    (void) fprintf(fd, " %sripout",
			   GA2S(cp->config_data) ? "" : "no");
	    break;

	case RIP_CONFIG_METRICIN:
	    (void) fprintf(fd, " metricin %u",
			   (metric_t) GA2S(cp->config_data));
	    break;

	case RIP_CONFIG_METRICOUT:
	    (void) fprintf(fd, " metricout %u",
			   (metric_t) GA2S(cp->config_data));
	    break;

	case RIP_CONFIG_FLAG:
	    (void) fprintf(fd, " <%s>",
			   trace_bits(rip_if_bits, (flag_t) GA2S(cp->config_data)));
	    break;

	case RIP_CONFIG_AUTH2:
	    (void) fprintf(fd, " secondary");
	    /* Fall through */
	    
	case RIP_CONFIG_AUTH:
	    {
		struct rip_authinfo *ap = (struct rip_authinfo *) cp->config_data;
		
		switch (ap->auth_type) {
		case RIP_AUTH_NONE:
		    (void) fprintf(fd, " authentication none");
		    break;

		case RIP_AUTH_SIMPLE:
		    (void) fprintf(fd, " authentication simple \"%.*s\"",
				   RIP_AUTH_SIZE, (char *) ap->auth_data);
		    break;

		case RIP_AUTH_MD5:
		    (void) fprintf(fd, " authentication md5 \"%.*s\"",
				   RIP_AUTH_SIZE, (char *) ap->auth_data);
		    break;
		    
		default:
		    (void) fprintf(fd, " unknown authentication type %u\n",
				   ap->auth_type);
		    break;
		}
	    }
	    break;

	default:
	    assert(FALSE);
	    break;
	}
    } CONFIG_LIST_END(cp, list) ;
}


static void
rip_dump __PF2(tp, task *,
	       fd, FILE *)
{
    (void) fprintf(fd, "\tFlags: %s\tDefault metric: %d\t\tDefault preference: %d\n",
		   trace_bits(rip_flag_bits, rip_flags),
		   rip_default_metric,
		   rip_preference);
    target_dump(fd, &rip_targets, rip_target_bits);
    if (rip_gw_list) {
	(void) fprintf(fd, "\tActive gateways:\n");
	gw_dump(fd,
		"\t\t",
		rip_gw_list,
		tp->task_rtproto);
	(void) fprintf(fd, "\n");
    }
    if (rip_int_policy) {
	(void) fprintf(fd, "\tInterface policy:\n");
	control_interface_dump(fd, 2, rip_int_policy, rip_int_dump);
    }
    control_import_dump(fd, 1, RTPROTO_RIP, rip_import_list, rip_gw_list);
    control_export_dump(fd, 1, RTPROTO_RIP, rip_export_list, rip_gw_list);
    (void) fprintf(fd, "\n");
}


/*
 *	Deal with an interface status change
 */
static void
rip_ifachange __PF2(tp, task *,
		    ifap, if_addr *)
{
    int changes = 0;
    gw_entry *gwp;

    if (socktype(ifap->ifa_addr) != AF_INET) {
	return;
    }
    
    rt_open(tp);
    
    switch (ifap->ifa_change) {
    case IFC_NOCHANGE:
    case IFC_ADD:
	if (BIT_TEST(ifap->ifa_state, IFS_UP)) {
	    rip_control_set(tp, ifap);
	}
	break;
	
    case IFC_DELETE:
    case IFC_DELETE|IFC_UPDOWN:
    Down:
	GW_LIST(rip_gw_list, gwp) {
	    rt_entry *rt;

	    RTQ_LIST(&gwp->gw_rtq, rt) {
		if (RT_IFAP(rt) == ifap) {
		    rt_delete(rt);
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
		    rip_global_changes++;
#endif	/* PROTO_SNMP && MIB_RIP */
		    changes++;
		}
	    } RTQ_LIST_END(&gwp->gw_rtq, rt) ;
	} GW_LIST_END(rip_gw_list, gwp) ;

	rip_control_reset(tp, ifap);

#ifdef	IP_MULTICAST
	if (ifap == rip_multicast_ifap) {
	    IFA_FREE(rip_multicast_ifap);
	    rip_multicast_ifap = (if_addr *) 0;
	}
#endif	/* IP_MULTICAST */
	break;

    default:
	/* Something has changed */

	if (BIT_TEST(ifap->ifa_change, IFC_UPDOWN)) {
	    if (BIT_TEST(ifap->ifa_state, IFS_UP)) {
		rip_control_set(tp, ifap);
	    } else {
		goto Down;
	    }
	}
	if (BIT_TEST(ifap->ifa_change, IFC_METRIC)) {
	    struct ifa_ps *ips = &ifap->ifa_ps[tp->task_rtproto];

	    /* The metric has changed, reset the POLL bit */
	    /* on any targets using this interface so we'll */
	    /* send another POLL */

	    if (!BIT_TEST(ips->ips_state, IFPS_METRICIN)) {
		target *tlp;

		ips->ips_metric_in = ifap->ifa_metric + RIP_HOP;

		TARGET_LIST(tlp, &rip_targets) {
		    if (tlp->target_ifap == ifap) {
			BIT_RESET(tlp->target_flags, RIPTF_POLL);
		    }
		} TARGET_LIST_END(tlp, &rip_targets) ;
	    }
	}
	if (BIT_TEST(ifap->ifa_change, IFC_NETMASK)) {
	    /* The netmask has changed, delete any routes that */
	    /* point at gateways that are no longer reachable */

	    target *tlp;
	    
	    GW_LIST(rip_gw_list, gwp) {
		rt_entry *rt;

		RTQ_LIST(&gwp->gw_rtq, rt) {
		    if (RT_IFAP(rt) == ifap
			&& (if_withdstaddr(RT_ROUTER(rt)) != ifap
			    || BIT_TEST(rt->rt_state, RTS_IFSUBNETMASK))) {
			/* Interface for this route has changed or we derived the subnet mask */
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
			rip_global_changes++;
#endif	/* PROTO_SNMP && MIB_RIP */
		    
			rt_delete(rt);
			changes++;
		    }
		} RTQ_LIST_END(&gwp->gw_rtq, rt) ;
	    } GW_LIST_END(rip_gw_list, gwp) ;

	    TARGET_LIST(tlp, &rip_targets) {
		if (tlp->target_ifap == ifap
		    && BIT_COMPARE(tlp->target_flags, TARGETF_SUPPLY|RIPTF_V2MC, TARGETF_SUPPLY)) {
		    /* Some subnet masks may have been derrived, indicate that policy needs to be rerun */

		    BIT_RESET(tlp->target_flags, TARGETF_POLICY);
		}
	    } TARGET_LIST_END(tlp, &rip_targets) ;
	}
	if (BIT_TEST(ifap->ifa_change, IFC_BROADCAST)) {
	    /* The broadcast address has changed.  Since target_dst */
	    /* Is a pointer to the pointer to the broadcast address */
	    /* the change is automatic.  But we should reset the POLL */
	    /* bit so we'll POLL this new address in case there are */
	    /* routers we did not yet hear from */

	    target *tlp = target_locate(&rip_targets, ifap, (gw_entry *) 0);

	    if (tlp
		&& !BIT_TEST(tlp->target_flags, RIPTF_V2MC)) {
		/* Using the broadcast address on this interface */

		BIT_RESET(tlp->target_flags, RIPTF_POLL);
	    }
	}
	    
	/* A LOCALADDR change will take effect when the peers notice that the */
	/* 	old address is no longer sending */
	/* An MTU change will take effece on output */
	/* A SEL change is not possible in IP */
	break;
    }

    rt_close(tp, (gw_entry *) 0, changes, NULL);

    /* Schedule a target list rebuild if necessary */
    if (!rip_target_list_job) {
	rip_target_list_job = task_job_create(tp,
					      TASK_JOB_FG,
					      "Target_Build",
					      rip_target_list,
					      (void_t) 0);
    }
#if	defined(PROTO_SNMP) && defined(MIB_RIP)
    /*
     * Rebuild the list of rip interfaces supporting the RIP II MIB.
     * Refer to RFC 1389 or rip-mib.c for more information.
     */
    o_rip_intf_get();
#endif	/* PROTO_SNMP && MIB_RIP */
}


/*
 * initialize RIP socket and RIP task
 */

/*ARGSUSED*/
void
rip_init()
{
    static task *rip_task;
    _PROTOTYPE(flash,
	       void,
	       (task *,
		rt_list *)) = rip_flash;	/* Hack for UTX/32 and Ultrix */
    _PROTOTYPE(newpolicy,
	       void,
	       (task *,
		rt_list *)) = rip_newpolicy;	/* ditto */

    if (BIT_TEST(rip_flags, RIPF_ON)) {
	trace_inherit_global(rip_trace_options, rip_trace_types, (flag_t) 0);
	if (!rip_task) {
	    rip_task = task_alloc("RIP",
				  TASKPRI_PROTO,
				  rip_trace_options);
	    if (!inet_udpcksum) {
		trace_log_tp(rip_task,
			     0,
			     LOG_ERR,
			     ("rip_init: UDP checksums *DISABLED* in kernel; RIP disabled"));
		task_delete(rip_task);
		rip_timer_update = rip_timer_flash = rip_timer_age = (task_timer *) 0;
		rip_task = (task *) 0;
		return;
	    }
	    if (!rip_port) {
		rip_port = task_get_port(rip_trace_options,
					 "route", "udp",
					 htons(RIP_PORT));
	    }
	    rip_task->task_addr = sockdup(inet_addr_any);
	    sock2port(rip_task->task_addr) = rip_port;
	    rip_task->task_rtproto = RTPROTO_RIP;
	    rip_task->task_rtfamily = AF_INET;
	    task_set_recv(rip_task, rip_recv);
	    task_set_cleanup(rip_task, rip_cleanup);
	    task_set_reinit(rip_task, rip_reinit);
	    task_set_dump(rip_task, rip_dump);
	    task_set_terminate(rip_task, rip_terminate);
	    task_set_ifachange(rip_task, rip_ifachange);
	    task_set_flash(rip_task, flash);
	    task_set_newpolicy(rip_task, newpolicy);

	    if ((rip_task->task_socket = task_get_socket(rip_task, AF_INET, SOCK_DGRAM, 0)) < 0) {
		task_quit(errno);
	    }
	    if (!task_create(rip_task)) {
		task_quit(EINVAL);
	    }

	    if (task_set_option(rip_task,
				TASKOPTION_BROADCAST,
				TRUE) < 0) {
		task_quit(errno);
	    }
	    if (task_set_option(rip_task,
				TASKOPTION_RECVBUF,
				task_maxpacket) < 0) {
		task_quit(errno);
	    }
	    (void) task_set_option(rip_task,
				   TASKOPTION_RCVDSTADDR,
				   TRUE);
	    if (task_set_option(rip_task,
				TASKOPTION_NONBLOCKING,
				TRUE) < 0) {
		task_quit(errno);
	    }
	    if (task_addr_local(rip_task, rip_task->task_addr)) {
		trace_log_tp(rip_task,
			     0,
			     LOG_ERR,
			     ("rip_init: is routed or an old copy of gated running?"));
		task_quit(errno);
	    }

	    /* Allocate the buffers */
	    task_alloc_send(rip_task, RIP_PKTSIZE);
	    task_alloc_recv(rip_task, RIP_PKTSIZE);

#if	defined(PROTO_SNMP) && defined(MIB_RIP)
	    rip_init_mib(TRUE);
#endif	/* PROTO_SNMP && MIB_RIP */

#ifdef	IP_MULTICAST
	    if (!rip_addr_mc) {
		/* Initialize address constant */

		rip_addr_mc = sockdup(sockbuild_in(0, htonl(RIP_ADDR_MC)));
	    }
#endif	/* IP_MULTICAST */

	}
    } else {
	rip_cleanup((task *) 0);

#if	defined(PROTO_SNMP) && defined(MIB_RIP)
	rip_init_mib(FALSE);
#endif	/* PROTO_SNMP && MIB_RIP */
	if (rip_task) {
	    rip_terminate(rip_task);

	    rip_task = (task *) 0;
	}
    }
}
