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//==========================================================================

//

//      src/sys/netinet6/ip6_mroute.c

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD, 

// FreeBSD or other sources, and are covered by the appropriate

// copyright disclaimers included herein.

//

// Portions created by Red Hat are

// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

/*      $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $     */

/*

 * Copyright (C) 1998 WIDE Project.

 * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.

 */

/*      BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp     */

/*

 * IP multicast forwarding procedures

 *

 * Written by David Waitzman, BBN Labs, August 1988.

 * Modified by Steve Deering, Stanford, February 1989.

 * Modified by Mark J. Steiglitz, Stanford, May, 1991

 * Modified by Van Jacobson, LBL, January 1993

 * Modified by Ajit Thyagarajan, PARC, August 1993

 * Modified by Bill Fenenr, PARC, April 1994

 *

 * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support

 */

/*

 * XXX it seems that home address option processing should be reverted

 * before calls to socket_send().  see sys/netinet6/dest6.c for details.

 */

#include <sys/param.h>

#include <sys/malloc.h>

#include <sys/mbuf.h>

#include <sys/socket.h>

#include <sys/socketvar.h>

#include <sys/sockio.h>

#include <sys/protosw.h>

#include <sys/errno.h>

#include <sys/time.h>

#include <net/if.h>

#include <net/route.h>

#include <net/raw_cb.h>

#include <netinet/in.h>

#include <netinet/in_var.h>

#include <netinet/ip6.h>

#include <netinet6/ip6_var.h>

#include <netinet6/ip6_mroute.h>

#include <netinet6/pim6.h>

#include <netinet6/pim6_var.h>

#define M_HASCL(m) ((m)->m_flags & M_EXT)

static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *));

static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *));

static int set_pim6 __P((int *));

#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)

static int get_pim6 __P((struct mbuf *));

#endif

static int socket_send __P((struct socket *, struct mbuf *,

                            struct sockaddr_in6 *));

static int register_send __P((struct ip6_hdr *, struct mif6 *,

                              struct mbuf *));

/*

 * Globals.  All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static,

 * except for netstat or debugging purposes.

 */

struct socket  *ip6_mrouter = NULL;

int             ip6_mrouter_ver = 0;

int             ip6_mrtproto = IPPROTO_PIM;    /* for netstat only */

struct mrt6stat mrt6stat;

#define NO_RTE_FOUND    0x1

#define RTE_FOUND       0x2

struct mf6c     *mf6ctable[MF6CTBLSIZ];

u_char          n6expire[MF6CTBLSIZ];

#if (defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802)) 

struct mif6 mif6table[MAXMIFS];

#else

static struct mif6 mif6table[MAXMIFS];

#endif

#ifdef MRT6DEBUG

u_int           mrt6debug = 0;     /* debug level        */

#define         DEBUG_MFC       0x02

#define         DEBUG_FORWARD   0x04

#define         DEBUG_EXPIRE    0x08

#define         DEBUG_XMIT      0x10

#define         DEBUG_REG       0x20

#define         DEBUG_PIM       0x40

#endif

static void     expire_upcalls __P((void *));

#define         EXPIRE_TIMEOUT  (hz / 4)        /* 4x / second */

#define         UPCALL_EXPIRE   6               /* number of timeouts */

#ifdef INET

#ifdef MROUTING

extern struct socket *ip_mrouter;

#endif

#endif

/*

 * 'Interfaces' associated with decapsulator (so we can tell

 * packets that went through it from ones that get reflected

 * by a broken gateway).  These interfaces are never linked into

 * the system ifnet list & no routes point to them.  I.e., packets

 * can't be sent this way.  They only exist as a placeholder for

 * multicast source verification.

 */

struct ifnet multicast_register_if;

#define ENCAP_HOPS 64

/*

 * Private variables.

 */

static mifi_t nummifs = 0;

static mifi_t reg_mif_num = (mifi_t)-1;

static struct pim6stat pim6stat;

static int pim6;

/*

 * Hash function for a source, group entry

 */

#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \

                                   (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \

                                   (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \

                                   (g).s6_addr32[2] ^ (g).s6_addr32[3])

/*

 * Find a route for a given origin IPv6 address and Multicast group address.

 * Quality of service parameter to be added in the future!!!

 */

#define MF6CFIND(o, g, rt) do { \

        struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \

        rt = NULL; \

        mrt6stat.mrt6s_mfc_lookups++; \

        while (_rt) { \

                if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \

                    IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \

                    (_rt->mf6c_stall == NULL)) { \

                        rt = _rt; \

                        break; \

                } \

                _rt = _rt->mf6c_next; \

        } \

        if (rt == NULL) { \

                mrt6stat.mrt6s_mfc_misses++; \

        } \

} while (0)

/*

 * Macros to compute elapsed time efficiently

 * Borrowed from Van Jacobson's scheduling code

 */

#define TV_DELTA(a, b, delta) do { \

            int xxs; \

                \

            delta = (a).tv_usec - (b).tv_usec; \

            if ((xxs = (a).tv_sec - (b).tv_sec)) { \

               switch (xxs) { \

                      case 2: \

                          delta += 1000000; \

                              /* fall through */ \

                      case 1: \

                          delta += 1000000; \

                          break; \

                      default: \

                          delta += (1000000 * xxs); \

               } \

            } \

} while (0)

#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \

              (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)

#ifdef UPCALL_TIMING

#define UPCALL_MAX      50

u_long upcall_data[UPCALL_MAX + 1];

static void collate();

#endif /* UPCALL_TIMING */

static int get_sg_cnt __P((struct sioc_sg_req6 *));

static int get_mif6_cnt __P((struct sioc_mif_req6 *));

static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int));

static int add_m6if __P((struct mif6ctl *));

static int del_m6if __P((mifi_t *));

static int add_m6fc __P((struct mf6cctl *));

static int del_m6fc __P((struct mf6cctl *));

#ifdef __NetBSD__

static struct callout expire_upcalls_ch = CALLOUT_INITIALIZER;

#elif (defined(__FreeBSD__) && __FreeBSD__ >= 3)

static struct callout expire_upcalls_ch;

#elif defined(__OpenBSD__)

static struct timeout expire_upcalls_ch;

#endif

/*

 * Handle MRT setsockopt commands to modify the multicast routing tables.

 */

#if defined(__FreeBSD__) && __FreeBSD__ >= 3

int

ip6_mrouter_set(so, sopt)

        struct socket *so;

        struct sockopt *sopt;

{

        int     error = 0;

        struct mbuf *m;

        if (so != ip6_mrouter && sopt->sopt_name != MRT6_INIT)

                return (EACCES);

        if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */

                return (error);

        if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */

                return (error);

        switch (sopt->sopt_name) {

        case MRT6_INIT:

#ifdef MRT6_OINIT

        case MRT6_OINIT:

#endif

                error = ip6_mrouter_init(so, m, sopt->sopt_name);

                break;

        case MRT6_DONE:

                error = ip6_mrouter_done();

                break;

        case MRT6_ADD_MIF:

                error = add_m6if(mtod(m, struct mif6ctl *));

                break;

        case MRT6_DEL_MIF:

                error = del_m6if(mtod(m, mifi_t *));

                break;

        case MRT6_ADD_MFC:

                error = add_m6fc(mtod(m, struct mf6cctl *));

                break;

        case MRT6_DEL_MFC:

                error = del_m6fc(mtod(m, struct mf6cctl *));

                break;

        case MRT6_PIM:

                error = set_pim6(mtod(m, int *));

                break;

        default:

                error = EOPNOTSUPP;

                break;

        }

        (void)m_freem(m);

        return(error);

}

#else

int

ip6_mrouter_set(cmd, so, m)

        int cmd;

        struct socket *so;

        struct mbuf *m;

{

        if (cmd != MRT6_INIT && so != ip6_mrouter)

                return EACCES;

        switch (cmd) {

#ifdef MRT6_OINIT

        case MRT6_OINIT:        return ip6_mrouter_init(so, m, cmd);

#endif

        case MRT6_INIT:         return ip6_mrouter_init(so, m, cmd);

        case MRT6_DONE:         return ip6_mrouter_done();

        case MRT6_ADD_MIF:      return add_m6if(mtod(m, struct mif6ctl *));

        case MRT6_DEL_MIF:      return del_m6if(mtod(m, mifi_t *));

        case MRT6_ADD_MFC:      return add_m6fc(mtod(m, struct mf6cctl *));

        case MRT6_DEL_MFC:      return del_m6fc(mtod(m, struct mf6cctl *));

        case MRT6_PIM:          return set_pim6(mtod(m, int *));

        default:                return EOPNOTSUPP;

        }

}

#endif

/*

 * Handle MRT getsockopt commands

 */

#if defined(__FreeBSD__) && __FreeBSD__ >= 3

int

ip6_mrouter_get(so, sopt)

        struct socket *so;

        struct sockopt *sopt;

{

        int error = 0;

        if (so != ip6_mrouter) return EACCES;

        switch (sopt->sopt_name) {

                case MRT6_PIM:

                        error = sooptcopyout(sopt, &pim6, sizeof(pim6));

                        break;

        }

        return (error);

}

#else

int

ip6_mrouter_get(cmd, so, m)

        int cmd;

        struct socket *so;

        struct mbuf **m;

{

        struct mbuf *mb;

        if (so != ip6_mrouter) return EACCES;

        *m = mb = m_get(M_WAIT, MT_SOOPTS);

        switch (cmd) {

        case MRT6_PIM:

                return get_pim6(mb);

        default:

                m_free(mb);

                return EOPNOTSUPP;

        }

}

#endif

/*

 * Handle ioctl commands to obtain information from the cache

 */

int

mrt6_ioctl(cmd, data)

        int cmd;

        caddr_t data;

{

        int error = 0;

        switch (cmd) {

        case SIOCGETSGCNT_IN6:

                return(get_sg_cnt((struct sioc_sg_req6 *)data));

                break;          /* for safety */

        case SIOCGETMIFCNT_IN6:

                return(get_mif6_cnt((struct sioc_mif_req6 *)data));

                break;          /* for safety */

        default:

                return (EINVAL);

                break;

        }

        return error;

}

/*

 * returns the packet, byte, rpf-failure count for the source group provided

 */

static int

get_sg_cnt(req)

        struct sioc_sg_req6 *req;

{

        struct mf6c *rt;

        int s;

#ifdef __NetBSD__

        s = splsoftnet();

#else

        s = splnet();

#endif

        MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);

        splx(s);

        if (rt != NULL) {

                req->pktcnt = rt->mf6c_pkt_cnt;

                req->bytecnt = rt->mf6c_byte_cnt;

                req->wrong_if = rt->mf6c_wrong_if;

        } else

                return(ESRCH);

#if 0

                req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;

#endif

        return 0;

}

/*

 * returns the input and output packet and byte counts on the mif provided

 */

static int

get_mif6_cnt(req)

        struct sioc_mif_req6 *req;

{

        mifi_t mifi = req->mifi;

        if (mifi >= nummifs)

                return EINVAL;

        req->icount = mif6table[mifi].m6_pkt_in;

        req->ocount = mif6table[mifi].m6_pkt_out;

        req->ibytes = mif6table[mifi].m6_bytes_in;

        req->obytes = mif6table[mifi].m6_bytes_out;

        return 0;

}

#if !(defined(__FreeBSD__) && __FreeBSD__ >=3)

/*

 * Get PIM processiong global

 */

static int

get_pim6(m)

        struct mbuf *m;

{

        int *i;

        i = mtod(m, int *);

        *i = pim6;

        return 0;

}

#endif

static int

set_pim6(i)

        int *i;

{

        if ((*i != 1) && (*i != 0))

                return EINVAL;

        pim6 = *i;

        return 0;

}

/*

 * Enable multicast routing

 */

static int

ip6_mrouter_init(so, m, cmd)

        struct socket *so;

        struct mbuf *m;

        int cmd;

{

        int *v;

#ifdef MRT6DEBUG

        if (mrt6debug)

                log(LOG_DEBUG,

                    "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",

                    so->so_type, so->so_proto->pr_protocol);

#endif

        if (so->so_type != SOCK_RAW ||

            so->so_proto->pr_protocol != IPPROTO_ICMPV6)

                return EOPNOTSUPP;

        if (!m || (m->m_len != sizeof(int *)))

                return ENOPROTOOPT;

        v = mtod(m, int *);

        if (*v != 1)

                return ENOPROTOOPT;

        if (ip6_mrouter != NULL) return EADDRINUSE;

        ip6_mrouter = so;

        ip6_mrouter_ver = cmd;

        bzero((caddr_t)mf6ctable, sizeof(mf6ctable));

        bzero((caddr_t)n6expire, sizeof(n6expire));

        pim6 = 0;/* used for stubbing out/in pim stuff */

#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)

        callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,

            expire_upcalls, NULL);

#elif defined(__OpenBSD__)

        timeout_set(&expire_upcalls_ch, expire_upcalls, NULL);

        timeout_add(&expire_upcalls_ch, EXPIRE_TIMEOUT);

#else

        timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);

#endif

#ifdef MRT6DEBUG

        if (mrt6debug)

                log(LOG_DEBUG, "ip6_mrouter_init\n");

#endif

        return 0;

}

/*

 * Disable multicast routing

 */

int

ip6_mrouter_done()

{

        mifi_t mifi;

        int i;

        struct ifnet *ifp;

        struct in6_ifreq ifr;

        struct mf6c *rt;

        struct rtdetq *rte;

        int s;

#ifdef __NetBSD__

        s = splsoftnet();

#else

        s = splnet();

#endif

        /*

         * For each phyint in use, disable promiscuous reception of all IPv6

         * multicasts.

         */

#ifdef INET

#ifdef MROUTING

        /*

         * If there is still IPv4 multicast routing daemon,

         * we remain interfaces to receive all muliticasted packets.

         * XXX: there may be an interface in which the IPv4 multicast

         * daemon is not interested...

         */

        if (!ip_mrouter)

#endif

#endif

        {

                for (mifi = 0; mifi < nummifs; mifi++) {

                        if (mif6table[mifi].m6_ifp &&

                            !(mif6table[mifi].m6_flags & MIFF_REGISTER)) {

                                ifr.ifr_addr.sin6_family = AF_INET6;

                                ifr.ifr_addr.sin6_addr= in6addr_any;

                                ifp = mif6table[mifi].m6_ifp;

                                (*ifp->if_ioctl)(ifp, SIOCDELMULTI,

                                                 (caddr_t)&ifr);

                        }

                }

        }

#ifdef notyet

        bzero((caddr_t)qtable, sizeof(qtable));

        bzero((caddr_t)tbftable, sizeof(tbftable));

#endif

        bzero((caddr_t)mif6table, sizeof(mif6table));

        nummifs = 0;

        pim6 = 0; /* used to stub out/in pim specific code */

#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)

        callout_stop(&expire_upcalls_ch);

#elif defined(__OpenBSD__)

        timeout_del(&expire_upcalls_ch);

#else

        untimeout(expire_upcalls, (caddr_t)NULL);

#endif

        /*

         * Free all multicast forwarding cache entries.

         */

        for (i = 0; i < MF6CTBLSIZ; i++) {

                rt = mf6ctable[i];

                while (rt) {

                        struct mf6c *frt;

                        for (rte = rt->mf6c_stall; rte != NULL; ) {

                                struct rtdetq *n = rte->next;

                                m_free(rte->m);

                                free(rte, M_MRTABLE);

                                rte = n;

                        }

                        frt = rt;

                        rt = rt->mf6c_next;

                        free(frt, M_MRTABLE);

                }

        }

        bzero((caddr_t)mf6ctable, sizeof(mf6ctable));

        /*

         * Reset de-encapsulation cache

         */

        reg_mif_num = -1;

        ip6_mrouter = NULL;

        ip6_mrouter_ver = 0;

        splx(s);

#ifdef MRT6DEBUG

        if (mrt6debug)

                log(LOG_DEBUG, "ip6_mrouter_done\n");

#endif

        return 0;

}

static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };

/*

 * Add a mif to the mif table

 */

static int

add_m6if(mifcp)

        struct mif6ctl *mifcp;

{

        struct mif6 *mifp;

        struct ifnet *ifp;

#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)

        struct in6_ifreq ifr;

#endif

        int error, s;

#ifdef notyet

        struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi;

#endif

        if (mifcp->mif6c_mifi >= MAXMIFS)

                return EINVAL;

        mifp = mif6table + mifcp->mif6c_mifi;

        if (mifp->m6_ifp)

                return EADDRINUSE; /* XXX: is it appropriate? */

        if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)

                return ENXIO;

        /*

         * XXX: some OSes can remove ifp and clear ifindex2ifnet[id]

         * even for id between 0 and if_index.

         */

#if defined(__FreeBSD__) && __FreeBSD__ >= 5

        ifp = ifnet_byindex(mifcp->mif6c_pifi);

#else

        ifp = ifindex2ifnet[mifcp->mif6c_pifi];

#endif

        if (ifp == NULL)

                return ENXIO;

        if (mifcp->mif6c_flags & MIFF_REGISTER) {

                if (reg_mif_num == (mifi_t)-1) {

#if defined(__NetBSD__) || defined(__OpenBSD__)

                        strcpy(multicast_register_if.if_xname,

                               "register_mif"); /* XXX */

#else

                        multicast_register_if.if_name = "register_mif";

#endif

                        multicast_register_if.if_flags |= IFF_LOOPBACK;

                        multicast_register_if.if_index = mifcp->mif6c_mifi;

                        reg_mif_num = mifcp->mif6c_mifi;

                }

                ifp = &multicast_register_if;

        } /* if REGISTER */

        else {

                /* Make sure the interface supports multicast */

                if ((ifp->if_flags & IFF_MULTICAST) == 0)

                        return EOPNOTSUPP;

#ifdef __NetBSD__

                s = splsoftnet();

#else

                s = splnet();