/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 1988, 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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, Berkeley 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.
 *
 *      @(#)rtsock.c    8.6 (Berkeley) 2/11/95
 */

/*
 * This file contains routines that processes routing socket requests.
 */

#include <sys/types.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/strlog.h>
#include <sys/dlpi.h>
#include <sys/ddi.h>
#include <sys/cmn_err.h>
#include <sys/debug.h>

#include <sys/systm.h>
#include <sys/param.h>
#include <sys/socket.h>
#define _SUN_TPI_VERSION        2
#include <sys/tihdr.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <net/if_dl.h>
#include <netinet/ip6.h>

#include <inet/common.h>
#include <inet/mi.h>
#include <inet/ip.h>
#include <inet/ip6.h>
#include <inet/ip_if.h>
#include <inet/ip_ire.h>
#include <inet/ip_rts.h>
#include <inet/ip_multi.h>
#include <sys/tsol/tndb.h>
#include <sys/tsol/tnet.h>

/*
 * Fills the message with the given info.
 */
void
rts_fill_msg_v6(int type, int rtm_addrs, const in6_addr_t *dst,
    const in6_addr_t *mask, const in6_addr_t *gateway,
    const in6_addr_t *src_addr, const in6_addr_t *brd_addr,
    const in6_addr_t *author, const in6_addr_t *ifaddr, const ill_t *ill,
    mblk_t *mp, const tsol_gc_t *gc)
{
        rt_msghdr_t     *rtm;
        sin6_t          *sin6;
        size_t          data_size, header_size;
        uchar_t         *cp;
        int             i;

        ASSERT(mp != NULL);
        /*
         * First find the type of the message
         * and its length.
         */
        header_size = rts_header_msg_size(type);
        /*
         * Now find the size of the data
         * that follows the message header.
         */
        data_size = rts_data_msg_size(rtm_addrs, AF_INET6, gc != NULL ? 1 : 0);

        rtm = (rt_msghdr_t *)mp->b_rptr;
        mp->b_wptr = &mp->b_rptr[header_size];
        cp = mp->b_wptr;
        bzero(cp, data_size);
        for (i = 0; i < RTA_NUMBITS; i++) {
                sin6 = (sin6_t *)cp;
                switch (rtm_addrs & (1 << i)) {
                case RTA_DST:
                        sin6->sin6_addr = *dst;
                        sin6->sin6_family = AF_INET6;
                        cp += sizeof (sin6_t);
                        break;
                case RTA_GATEWAY:
                        sin6->sin6_addr = *gateway;
                        sin6->sin6_family = AF_INET6;
                        cp += sizeof (sin6_t);
                        break;
                case RTA_NETMASK:
                        sin6->sin6_addr = *mask;
                        sin6->sin6_family = AF_INET6;
                        cp += sizeof (sin6_t);
                        break;
                case RTA_IFA:
                        sin6->sin6_addr = *ifaddr;
                        sin6->sin6_family = AF_INET6;
                        cp += sizeof (sin6_t);
                        break;
                case RTA_SRC:
                        sin6->sin6_addr = *src_addr;
                        sin6->sin6_family = AF_INET6;
                        cp += sizeof (sin6_t);
                        break;
                case RTA_IFP:
                        cp += ill_dls_info((struct sockaddr_dl *)cp, ill);
                        break;
                case RTA_AUTHOR:
                        sin6->sin6_addr = *author;
                        sin6->sin6_family = AF_INET6;
                        cp += sizeof (sin6_t);
                        break;
                case RTA_BRD:
                        /*
                         * RTA_BRD is used typically to specify a point-to-point
                         * destination address.
                         */
                        sin6->sin6_addr = *brd_addr;
                        sin6->sin6_family = AF_INET6;
                        cp += sizeof (sin6_t);
                        break;
                }
        }

        if (gc != NULL) {
                rtm_ext_t *rtm_ext;
                struct rtsa_s *rp_dst;
                tsol_rtsecattr_t *rsap;

                ASSERT(gc->gc_grp != NULL);
                ASSERT(RW_LOCK_HELD(&gc->gc_grp->gcgrp_rwlock));

                rtm_ext = (rtm_ext_t *)cp;
                rtm_ext->rtmex_type = RTMEX_GATEWAY_SECATTR;
                rtm_ext->rtmex_len = TSOL_RTSECATTR_SIZE(1);

                rsap = (tsol_rtsecattr_t *)(rtm_ext + 1);
                rsap->rtsa_cnt = 1;
                rp_dst = rsap->rtsa_attr;

                ASSERT(gc->gc_db != NULL);
                bcopy(&gc->gc_db->gcdb_attr, rp_dst, sizeof (*rp_dst));
                cp = (uchar_t *)rp_dst;
        }

        mp->b_wptr = cp;
        mp->b_cont = NULL;
        /*
         * set the fields that are common to
         * to different messages.
         */
        rtm->rtm_msglen = (short)(header_size + data_size);
        rtm->rtm_version = RTM_VERSION;
        rtm->rtm_type = (uchar_t)type;
}

/*
 * This routine is called to generate a message to the routing
 * socket indicating that a redirect has occured, a routing lookup
 * has failed, or that a protocol has detected timeouts to a particular
 * destination. This routine is called for message types RTM_LOSING,
 * RTM_REDIRECT, and RTM_MISS.
 */
void
ip_rts_change_v6(int type, const in6_addr_t *dst_addr,
    const in6_addr_t *gw_addr, const in6_addr_t *net_mask,
    const in6_addr_t *source, const in6_addr_t *author,
    int flags, int error, int rtm_addrs, ip_stack_t *ipst)
{
        rt_msghdr_t     *rtm;
        mblk_t          *mp;

        if (rtm_addrs == 0)
                return;
        mp = rts_alloc_msg(type, rtm_addrs, AF_INET6, 0);
        if (mp == NULL)
                return;
        rts_fill_msg_v6(type, rtm_addrs, dst_addr, net_mask, gw_addr, source,
            &ipv6_all_zeros, &ipv6_all_zeros, author, NULL, mp, NULL);
        rtm = (rt_msghdr_t *)mp->b_rptr;
        rtm->rtm_flags = flags;
        rtm->rtm_errno = error;
        rtm->rtm_flags |= RTF_DONE;
        rtm->rtm_addrs = rtm_addrs;
        rts_queue_input(mp, NULL, AF_INET6, RTSQ_ALL, ipst);
}