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ip_mroute.c

//==========================================================================
//
//      src/sys/netinet/ip_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####
//==========================================================================

/*
 * 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 Fenner, PARC, April 1995
 *
 * MROUTING Revision: 3.5
 * $FreeBSD: src/sys/netinet/ip_mroute.c,v 1.56.2.2 2001/07/19 06:37:26 kris Exp $
 */

#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_pcb.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_var.h>
#include <netinet/igmp.h>
#include <netinet/ip_mroute.h>
#include <netinet/udp.h>

#ifndef NTOHL
#if BYTE_ORDER != BIG_ENDIAN
#define NTOHL(d) ((d) = ntohl((d)))
#define NTOHS(d) ((d) = ntohs((u_short)(d)))
#define HTONL(d) ((d) = htonl((d)))
#define HTONS(d) ((d) = htons((u_short)(d)))
#else
#define NTOHL(d)
#define NTOHS(d)
#define HTONL(d)
#define HTONS(d)
#endif
#endif

#ifndef MROUTING
extern u_long     _ip_mcast_src __P((int vifi));
extern int  _ip_mforward __P((struct ip *ip, struct ifnet *ifp,
                          struct mbuf *m, struct ip_moptions *imo));
extern int  _ip_mrouter_done __P((void));
extern int  _ip_mrouter_get __P((struct socket *so, struct sockopt *sopt));
extern int  _ip_mrouter_set __P((struct socket *so, struct sockopt *sopt));
extern int  _mrt_ioctl __P((int req, caddr_t data, struct proc *p));

/*
 * Dummy routines and globals used when multicast routing is not compiled in.
 */

struct socket  *ip_mrouter  = NULL;
u_int       rsvpdebug = 0;

int
_ip_mrouter_set(so, sopt)
      struct socket *so;
      struct sockopt *sopt;
{
      return(EOPNOTSUPP);
}

int (*ip_mrouter_set)(struct socket *, struct sockopt *) = _ip_mrouter_set;


int
_ip_mrouter_get(so, sopt)
      struct socket *so;
      struct sockopt *sopt;
{
      return(EOPNOTSUPP);
}

int (*ip_mrouter_get)(struct socket *, struct sockopt *) = _ip_mrouter_get;

int
_ip_mrouter_done()
{
      return(0);
}

int (*ip_mrouter_done)(void) = _ip_mrouter_done;

int
_ip_mforward(ip, ifp, m, imo)
      struct ip *ip;
      struct ifnet *ifp;
      struct mbuf *m;
      struct ip_moptions *imo;
{
      return(0);
}

int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
               struct ip_moptions *) = _ip_mforward;

int
_mrt_ioctl(int req, caddr_t data, struct proc *p)
{
      return EOPNOTSUPP;
}

int (*mrt_ioctl)(int, caddr_t, struct proc *) = _mrt_ioctl;

void
rsvp_input(m, off)            /* XXX must fixup manually */
      struct mbuf *m;
      int off;
{
    /* Can still get packets with rsvp_on = 0 if there is a local member
     * of the group to which the RSVP packet is addressed.  But in this
     * case we want to throw the packet away.
     */
    if (!rsvp_on) {
      m_freem(m);
      return;
    }
 
    if (ip_rsvpd != NULL) {
      if (rsvpdebug)
          printf("rsvp_input: Sending packet up old-style socket\n");
      rip_input(m, off);
      return;
    }
    /* Drop the packet */
    m_freem(m);
}

void ipip_input(struct mbuf *m, int off) { /* XXX must fixup manually */
      rip_input(m, off);
}

int (*legal_vif_num)(int) = 0;

/*
 * This should never be called, since IP_MULTICAST_VIF should fail, but
 * just in case it does get called, the code a little lower in ip_output
 * will assign the packet a local address.
 */
u_long
_ip_mcast_src(int vifi) { return INADDR_ANY; }
u_long (*ip_mcast_src)(int) = _ip_mcast_src;

int
ip_rsvp_vif_init(so, sopt)
    struct socket *so;
    struct sockopt *sopt;
{
    return(EINVAL);
}

int
ip_rsvp_vif_done(so, sopt)
    struct socket *so;
    struct sockopt *sopt;
{
    return(EINVAL);
}

void
ip_rsvp_force_done(so)
    struct socket *so;
{
    return;
}

#else /* MROUTING */

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

#define INSIZ           sizeof(struct in_addr)
#define     same(a1, a2) \
      (bcmp((caddr_t)(a1), (caddr_t)(a2), INSIZ) == 0)

/*
 * Globals.  All but ip_mrouter and ip_mrtproto could be static,
 * except for netstat or debugging purposes.
 */
#ifndef MROUTE_LKM
struct socket  *ip_mrouter  = NULL;
static struct mrtstat   mrtstat;
#else /* MROUTE_LKM */
extern void X_ipip_input __P((struct mbuf *m, int iphlen));
extern struct mrtstat mrtstat;
static int ip_mrtproto;
#endif

#define NO_RTE_FOUND    0x1
#define RTE_FOUND 0x2

static struct mfc *mfctable[MFCTBLSIZ];
static u_char           nexpire[MFCTBLSIZ];
static struct vif viftable[MAXVIFS];
static u_int      mrtdebug = 0;       /* debug level  */
#define           DEBUG_MFC   0x02
#define           DEBUG_FORWARD     0x04
#define           DEBUG_EXPIRE      0x08
#define           DEBUG_XMIT  0x10
static u_int      tbfdebug = 0;     /* tbf debug level      */
static u_int      rsvpdebug = 0;      /* rsvp debug level   */

static struct callout_handle expire_upcalls_ch;

#define           EXPIRE_TIMEOUT    (hz / 4)    /* 4x / second          */
#define           UPCALL_EXPIRE     6           /* number of timeouts   */

/*
 * Define the token bucket filter structures
 * tbftable -> each vif has one of these for storing info 
 */

static struct tbf tbftable[MAXVIFS];
#define           TBF_REPROCESS     (hz / 100)  /* 100x / second */

/*
 * '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.
 */
static struct ifnet multicast_decap_if[MAXVIFS];

#define ENCAP_TTL 64
#define ENCAP_PROTO IPPROTO_IPIP    /* 4 */

/* prototype IP hdr for encapsulated packets */
static struct ip multicast_encap_iphdr = {
#if BYTE_ORDER == LITTLE_ENDIAN
      sizeof(struct ip) >> 2, IPVERSION,
#else
      IPVERSION, sizeof(struct ip) >> 2,
#endif
      0,                      /* tos */
      sizeof(struct ip),            /* total length */
      0,                      /* id */
      0,                      /* frag offset */
      ENCAP_TTL, ENCAP_PROTO, 
      0,                      /* checksum */
};

/*
 * Private variables.
 */
static vifi_t        numvifs = 0;
static int have_encap_tunnel = 0;

/*
 * one-back cache used by ipip_input to locate a tunnel's vif
 * given a datagram's src ip address.
 */
static u_long last_encap_src;
static struct vif *last_encap_vif;

static u_long     X_ip_mcast_src __P((int vifi));
static int  X_ip_mforward __P((struct ip *ip, struct ifnet *ifp, struct mbuf *m, struct ip_moptions *imo));
static int  X_ip_mrouter_done __P((void));
static int  X_ip_mrouter_get __P((struct socket *so, struct sockopt *m));
static int  X_ip_mrouter_set __P((struct socket *so, struct sockopt *m));
static int  X_legal_vif_num __P((int vif));
static int  X_mrt_ioctl __P((int cmd, caddr_t data));

static int get_sg_cnt(struct sioc_sg_req *);
static int get_vif_cnt(struct sioc_vif_req *);
static int ip_mrouter_init(struct socket *, int);
static int add_vif(struct vifctl *);
static int del_vif(vifi_t);
static int add_mfc(struct mfcctl *);
static int del_mfc(struct mfcctl *);
static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in *);
static int set_assert(int);
static void expire_upcalls(void *);
static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *,
              vifi_t);
static void phyint_send(struct ip *, struct vif *, struct mbuf *);
static void encap_send(struct ip *, struct vif *, struct mbuf *);
static void tbf_control(struct vif *, struct mbuf *, struct ip *, u_long);
static void tbf_queue(struct vif *, struct mbuf *);
static void tbf_process_q(struct vif *);
static void tbf_reprocess_q(void *);
static int tbf_dq_sel(struct vif *, struct ip *);
static void tbf_send_packet(struct vif *, struct mbuf *);
static void tbf_update_tokens(struct vif *);
static int priority(struct vif *, struct ip *);
void multiencap_decap(struct mbuf *);

/*
 * whether or not special PIM assert processing is enabled.
 */
static int pim_assert;
/*
 * Rate limit for assert notification messages, in usec
 */
#define ASSERT_MSG_TIME       3000000

/*
 * Hash function for a source, group entry
 */
#define MFCHASH(a, g) MFCHASHMOD(((a) >> 20) ^ ((a) >> 10) ^ (a) ^ \
                  ((g) >> 20) ^ ((g) >> 10) ^ (g))

/*
 * Find a route for a given origin IP address and Multicast group address
 * Type of service parameter to be added in the future!!!
 */

#define MFCFIND(o, g, rt) { \
      register struct mfc *_rt = mfctable[MFCHASH(o,g)]; \
      rt = NULL; \
      ++mrtstat.mrts_mfc_lookups; \
      while (_rt) { \
            if ((_rt->mfc_origin.s_addr == o) && \
                (_rt->mfc_mcastgrp.s_addr == g) && \
                (_rt->mfc_stall == NULL)) { \
                  rt = _rt; \
                  break; \
            } \
            _rt = _rt->mfc_next; \
      } \
      if (rt == NULL) { \
            ++mrtstat.mrts_mfc_misses; \
      } \
}


/*
 * Macros to compute elapsed time efficiently
 * Borrowed from Van Jacobson's scheduling code
 */
#define TV_DELTA(a, b, delta) { \
          register 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); \
             } \
          } \
}

#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
u_long upcall_data[51];
static void collate(struct timeval *);
#endif /* UPCALL_TIMING */


/*
 * Handle MRT setsockopt commands to modify the multicast routing tables.
 */
static int
X_ip_mrouter_set(so, sopt)
      struct socket *so;
      struct sockopt *sopt;
{
      int   error, optval;
      vifi_t      vifi;
      struct      vifctl vifc;
      struct      mfcctl mfc;

      if (so != ip_mrouter && sopt->sopt_name != MRT_INIT)
            return (EPERM);

      error = 0;
      switch (sopt->sopt_name) {
      case MRT_INIT:
            error = sooptcopyin(sopt, &optval, sizeof optval, 
                            sizeof optval);
            if (error)
                  break;
            error = ip_mrouter_init(so, optval);
            break;

      case MRT_DONE:
            error = ip_mrouter_done();
            break;

      case MRT_ADD_VIF:
            error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc);
            if (error)
                  break;
            error = add_vif(&vifc);
            break;

      case MRT_DEL_VIF:
            error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi);
            if (error)
                  break;
            error = del_vif(vifi);
            break;

      case MRT_ADD_MFC:
      case MRT_DEL_MFC:
            error = sooptcopyin(sopt, &mfc, sizeof mfc, sizeof mfc);
            if (error)
                  break;
            if (sopt->sopt_name == MRT_ADD_MFC)
                  error = add_mfc(&mfc);
            else
                  error = del_mfc(&mfc);
            break;

      case MRT_ASSERT:
            error = sooptcopyin(sopt, &optval, sizeof optval, 
                            sizeof optval);
            if (error)
                  break;
            set_assert(optval);
            break;

      default:
            error = EOPNOTSUPP;
            break;
      }
      return (error);
}

#ifndef MROUTE_LKM
int (*ip_mrouter_set)(struct socket *, struct sockopt *) = X_ip_mrouter_set;
#endif

/*
 * Handle MRT getsockopt commands
 */
static int
X_ip_mrouter_get(so, sopt)
      struct socket *so;
      struct sockopt *sopt;
{
      int error;
      static int version = 0x0305; /* !!! why is this here? XXX */

      switch (sopt->sopt_name) {
      case MRT_VERSION:
            error = sooptcopyout(sopt, &version, sizeof version);
            break;

      case MRT_ASSERT:
            error = sooptcopyout(sopt, &pim_assert, sizeof pim_assert);
            break;
      default:
            error = EOPNOTSUPP;
            break;
      }
      return (error);
}

#ifndef MROUTE_LKM
int (*ip_mrouter_get)(struct socket *, struct sockopt *) = X_ip_mrouter_get;
#endif

/*
 * Handle ioctl commands to obtain information from the cache
 */
static int
X_mrt_ioctl(cmd, data)
    int cmd;
    caddr_t data;
{
    int error = 0;

    switch (cmd) {
      case (SIOCGETVIFCNT):
          return (get_vif_cnt((struct sioc_vif_req *)data));
          break;
      case (SIOCGETSGCNT):
          return (get_sg_cnt((struct sioc_sg_req *)data));
          break;
      default:
          return (EINVAL);
          break;
    }
    return error;
}

#ifndef MROUTE_LKM
int (*mrt_ioctl)(int, caddr_t) = X_mrt_ioctl;
#endif

/*
 * returns the packet, byte, rpf-failure count for the source group provided
 */
static int
get_sg_cnt(req)
    register struct sioc_sg_req *req;
{
    register struct mfc *rt;
    int s;

    s = splnet();
    MFCFIND(req->src.s_addr, req->grp.s_addr, rt);
    splx(s);
    if (rt != NULL) {
      req->pktcnt = rt->mfc_pkt_cnt;
      req->bytecnt = rt->mfc_byte_cnt;
      req->wrong_if = rt->mfc_wrong_if;
    } else
      req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;

    return 0;
}

/*
 * returns the input and output packet and byte counts on the vif provided
 */
static int
get_vif_cnt(req)
    register struct sioc_vif_req *req;
{
    register vifi_t vifi = req->vifi;

    if (vifi >= numvifs) return EINVAL;

    req->icount = viftable[vifi].v_pkt_in;
    req->ocount = viftable[vifi].v_pkt_out;
    req->ibytes = viftable[vifi].v_bytes_in;
    req->obytes = viftable[vifi].v_bytes_out;

    return 0;
}

/*
 * Enable multicast routing
 */
static int
ip_mrouter_init(so, version)
      struct socket *so;
      int version;
{
    if (mrtdebug)
      log(LOG_DEBUG,"ip_mrouter_init: so_type = %d, pr_protocol = %d\n",
            so->so_type, so->so_proto->pr_protocol);

    if (so->so_type != SOCK_RAW ||
      so->so_proto->pr_protocol != IPPROTO_IGMP) return EOPNOTSUPP;

    if (version != 1)
      return ENOPROTOOPT;

    if (ip_mrouter != NULL) return EADDRINUSE;

    ip_mrouter = so;

    bzero((caddr_t)mfctable, sizeof(mfctable));
    bzero((caddr_t)nexpire, sizeof(nexpire));

    pim_assert = 0;

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

    if (mrtdebug)
      log(LOG_DEBUG, "ip_mrouter_init\n");

    return 0;
}

/*
 * Disable multicast routing
 */
static int
X_ip_mrouter_done()
{
    vifi_t vifi;
    int i;
    struct ifnet *ifp;
    struct ifreq ifr;
    struct mfc *rt;
    struct rtdetq *rte;
    int s;

    s = splnet();

    /*
     * For each phyint in use, disable promiscuous reception of all IP
     * multicasts.
     */
    for (vifi = 0; vifi < numvifs; vifi++) {
      if (viftable[vifi].v_lcl_addr.s_addr != 0 &&
          !(viftable[vifi].v_flags & VIFF_TUNNEL)) {
          ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET;
          ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr
                                                = INADDR_ANY;
          ifp = viftable[vifi].v_ifp;
          if_allmulti(ifp, 0);
      }
    }
    bzero((caddr_t)tbftable, sizeof(tbftable));
    bzero((caddr_t)viftable, sizeof(viftable));
    numvifs = 0;
    pim_assert = 0;

    untimeout(expire_upcalls, (caddr_t)NULL, expire_upcalls_ch);

    /*
     * Free all multicast forwarding cache entries.
     */
    for (i = 0; i < MFCTBLSIZ; i++) {
      for (rt = mfctable[i]; rt != NULL; ) {
          struct mfc *nr = rt->mfc_next;

          for (rte = rt->mfc_stall; rte != NULL; ) {
            struct rtdetq *n = rte->next;

            m_freem(rte->m);
            free(rte, M_MRTABLE);
            rte = n;
          }
          free(rt, M_MRTABLE);
          rt = nr;
      }
    }

    bzero((caddr_t)mfctable, sizeof(mfctable));

    /*
     * Reset de-encapsulation cache
     */
    last_encap_src = 0;
    last_encap_vif = NULL;
    have_encap_tunnel = 0;
 
    ip_mrouter = NULL;

    splx(s);

    if (mrtdebug)
      log(LOG_DEBUG, "ip_mrouter_done\n");

    return 0;
}

#ifndef MROUTE_LKM
int (*ip_mrouter_done)(void) = X_ip_mrouter_done;
#endif

/*
 * Set PIM assert processing global
 */
static int
set_assert(i)
      int i;
{
    if ((i != 1) && (i != 0))
      return EINVAL;

    pim_assert = i;

    return 0;
}

/*
 * Add a vif to the vif table
 */
static int
add_vif(vifcp)
    register struct vifctl *vifcp;
{
    register struct vif *vifp = viftable + vifcp->vifc_vifi;
    static struct sockaddr_in sin = {sizeof sin, AF_INET};
    struct ifaddr *ifa;
    struct ifnet *ifp;
    int error, s;
    struct tbf *v_tbf = tbftable + vifcp->vifc_vifi;

    if (vifcp->vifc_vifi >= MAXVIFS)  return EINVAL;
    if (vifp->v_lcl_addr.s_addr != 0) return EADDRINUSE;

    /* Find the interface with an address in AF_INET family */
    sin.sin_addr = vifcp->vifc_lcl_addr;
    ifa = ifa_ifwithaddr((struct sockaddr *)&sin);
    if (ifa == 0) return EADDRNOTAVAIL;
    ifp = ifa->ifa_ifp;

    if (vifcp->vifc_flags & VIFF_TUNNEL) {
      if ((vifcp->vifc_flags & VIFF_SRCRT) == 0) {
            /*
             * An encapsulating tunnel is wanted.  Tell ipip_input() to
             * start paying attention to encapsulated packets.
             */
            if (have_encap_tunnel == 0) {
                  have_encap_tunnel = 1;
                  for (s = 0; s < MAXVIFS; ++s) {
                        multicast_decap_if[s].if_name = "mdecap";
                        multicast_decap_if[s].if_unit = s;
                  }
            }
            /*
             * Set interface to fake encapsulator interface
             */
            ifp = &multicast_decap_if[vifcp->vifc_vifi];
            /*
             * Prepare cached route entry
             */
            bzero(&vifp->v_route, sizeof(vifp->v_route));
      } else {
          log(LOG_ERR, "source routed tunnels not supported\n");
          return EOPNOTSUPP;
      }
    } else {
      /* Make sure the interface supports multicast */
      if ((ifp->if_flags & IFF_MULTICAST) == 0)
          return EOPNOTSUPP;

      /* Enable promiscuous reception of all IP multicasts from the if */
      s = splnet();
      error = if_allmulti(ifp, 1);
      splx(s);
      if (error)
          return error;
    }

    s = splnet();
    /* define parameters for the tbf structure */
    vifp->v_tbf = v_tbf;
    GET_TIME(vifp->v_tbf->tbf_last_pkt_t);
    vifp->v_tbf->tbf_n_tok = 0;
    vifp->v_tbf->tbf_q_len = 0;
    vifp->v_tbf->tbf_max_q_len = MAXQSIZE;
    vifp->v_tbf->tbf_q = vifp->v_tbf->tbf_t = NULL;

    vifp->v_flags     = vifcp->vifc_flags;
    vifp->v_threshold = vifcp->vifc_threshold;
    vifp->v_lcl_addr  = vifcp->vifc_lcl_addr;
    vifp->v_rmt_addr  = vifcp->vifc_rmt_addr;
    vifp->v_ifp       = ifp;
    /* scaling up here allows division by 1024 in critical code */
    vifp->v_rate_limit= vifcp->vifc_rate_limit * 1024 / 1000;
    vifp->v_rsvp_on   = 0;
    vifp->v_rsvpd     = NULL;
    /* initialize per vif pkt counters */
    vifp->v_pkt_in    = 0;
    vifp->v_pkt_out   = 0;
    vifp->v_bytes_in  = 0;
    vifp->v_bytes_out = 0;
    splx(s);

    /* Adjust numvifs up if the vifi is higher than numvifs */
    if (numvifs <= vifcp->vifc_vifi) numvifs = vifcp->vifc_vifi + 1;

    if (mrtdebug)
      log(LOG_DEBUG, "add_vif #%d, lcladdr %lx, %s %lx, thresh %x, rate %d\n",
          vifcp->vifc_vifi, 
          (u_long)ntohl(vifcp->vifc_lcl_addr.s_addr),
          (vifcp->vifc_flags & VIFF_TUNNEL) ? "rmtaddr" : "mask",
          (u_long)ntohl(vifcp->vifc_rmt_addr.s_addr),
          vifcp->vifc_threshold,
          vifcp->vifc_rate_limit);    

    return 0;
}

/*
 * Delete a vif from the vif table
 */
static int
del_vif(vifi)
      vifi_t vifi;
{
    register struct vif *vifp = &viftable[vifi];
    register struct mbuf *m;
    struct ifnet *ifp;
    struct ifreq ifr;
    int s;

    if (vifi >= numvifs) return EINVAL;
    if (vifp->v_lcl_addr.s_addr == 0) return EADDRNOTAVAIL;

    s = splnet();

    if (!(vifp->v_flags & VIFF_TUNNEL)) {
      ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_family = AF_INET;
      ((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr.s_addr = INADDR_ANY;
      ifp = vifp->v_ifp;
      if_allmulti(ifp, 0);
    }

    if (vifp == last_encap_vif) {
      last_encap_vif = 0;
      last_encap_src = 0;
    }

    /*
     * Free packets queued at the interface
     */
    while (vifp->v_tbf->tbf_q) {
      m = vifp->v_tbf->tbf_q;
      vifp->v_tbf->tbf_q = m->m_act;
      m_freem(m);
    }

    bzero((caddr_t)vifp->v_tbf, sizeof(*(vifp->v_tbf)));
    bzero((caddr_t)vifp, sizeof (*vifp));

    if (mrtdebug)
      log(LOG_DEBUG, "del_vif %d, numvifs %d\n", vifi, numvifs);

    /* Adjust numvifs down */
    for (vifi = numvifs; vifi > 0; vifi--)
      if (viftable[vifi-1].v_lcl_addr.s_addr != 0) break;
    numvifs = vifi;

    splx(s);

    return 0;
}

/*
 * Add an mfc entry
 */
static int
add_mfc(mfccp)
    struct mfcctl *mfccp;
{
    struct mfc *rt;
    u_long hash;
    struct rtdetq *rte;
    register u_short nstl;
    int s;
    int i;

    MFCFIND(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr, rt);

    /* If an entry already exists, just update the fields */
    if (rt) {
      if (mrtdebug & DEBUG_MFC)
          log(LOG_DEBUG,"add_mfc update o %lx g %lx p %x\n",
            (u_long)ntohl(mfccp->mfcc_origin.s_addr),
            (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
            mfccp->mfcc_parent);

      s = splnet();
      rt->mfc_parent = mfccp->mfcc_parent;
      for (i = 0; i < numvifs; i++)
          rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
      splx(s);
      return 0;
    }

    /* 
     * Find the entry for which the upcall was made and update
     */
    s = splnet();
    hash = MFCHASH(mfccp->mfcc_origin.s_addr, mfccp->mfcc_mcastgrp.s_addr);
    for (rt = mfctable[hash], nstl = 0; rt; rt = rt->mfc_next) {

      if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) &&
          (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr) &&
          (rt->mfc_stall != NULL)) {
  
          if (nstl++)
            log(LOG_ERR, "add_mfc %s o %lx g %lx p %x dbx %p\n",
                "multiple kernel entries",
                (u_long)ntohl(mfccp->mfcc_origin.s_addr),
                (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
                mfccp->mfcc_parent, (void *)rt->mfc_stall);

          if (mrtdebug & DEBUG_MFC)
            log(LOG_DEBUG,"add_mfc o %lx g %lx p %x dbg %p\n",
                (u_long)ntohl(mfccp->mfcc_origin.s_addr),
                (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
                mfccp->mfcc_parent, (void *)rt->mfc_stall);

          rt->mfc_origin     = mfccp->mfcc_origin;
          rt->mfc_mcastgrp   = mfccp->mfcc_mcastgrp;
          rt->mfc_parent     = mfccp->mfcc_parent;
          for (i = 0; i < numvifs; i++)
            rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
          /* initialize pkt counters per src-grp */
          rt->mfc_pkt_cnt    = 0;
          rt->mfc_byte_cnt   = 0;
          rt->mfc_wrong_if   = 0;
          rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0;

          rt->mfc_expire = 0; /* Don't clean this guy up */
          nexpire[hash]--;

          /* free packets Qed at the end of this entry */
          for (rte = rt->mfc_stall; rte != NULL; ) {
            struct rtdetq *n = rte->next;

            ip_mdq(rte->m, rte->ifp, rt, -1);
            m_freem(rte->m);
#ifdef UPCALL_TIMING
            collate(&(rte->t));
#endif /* UPCALL_TIMING */
            free(rte, M_MRTABLE);
            rte = n;
          }
          rt->mfc_stall = NULL;
      }
    }

    /*
     * It is possible that an entry is being inserted without an upcall
     */
    if (nstl == 0) {
      if (mrtdebug & DEBUG_MFC)
          log(LOG_DEBUG,"add_mfc no upcall h %lu o %lx g %lx p %x\n",
            hash, (u_long)ntohl(mfccp->mfcc_origin.s_addr),
            (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
            mfccp->mfcc_parent);
      
      for (rt = mfctable[hash]; rt != NULL; rt = rt->mfc_next) {
          
          if ((rt->mfc_origin.s_addr == mfccp->mfcc_origin.s_addr) &&
            (rt->mfc_mcastgrp.s_addr == mfccp->mfcc_mcastgrp.s_addr)) {

            rt->mfc_origin     = mfccp->mfcc_origin;
            rt->mfc_mcastgrp   = mfccp->mfcc_mcastgrp;
            rt->mfc_parent     = mfccp->mfcc_parent;
            for (i = 0; i < numvifs; i++)
                rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
            /* initialize pkt counters per src-grp */
            rt->mfc_pkt_cnt    = 0;
            rt->mfc_byte_cnt   = 0;
            rt->mfc_wrong_if   = 0;
            rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0;
            if (rt->mfc_expire)
                nexpire[hash]--;
            rt->mfc_expire       = 0;
          }
      }
      if (rt == NULL) {
          /* no upcall, so make a new entry */
          rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT);
          if (rt == NULL) {
            splx(s);
            return ENOBUFS;
          }
          
          /* insert new entry at head of hash chain */
          rt->mfc_origin     = mfccp->mfcc_origin;
          rt->mfc_mcastgrp   = mfccp->mfcc_mcastgrp;
          rt->mfc_parent     = mfccp->mfcc_parent;
          for (i = 0; i < numvifs; i++)
                rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
          /* initialize pkt counters per src-grp */
          rt->mfc_pkt_cnt    = 0;
          rt->mfc_byte_cnt   = 0;
          rt->mfc_wrong_if   = 0;
          rt->mfc_last_assert.tv_sec = rt->mfc_last_assert.tv_usec = 0;
          rt->mfc_expire     = 0;
          rt->mfc_stall      = NULL;
          
          /* link into table */
          rt->mfc_next = mfctable[hash];
          mfctable[hash] = rt;
      }
    }
    splx(s);
    return 0;
}

#ifdef UPCALL_TIMING
/*
 * collect delay statistics on the upcalls 
 */
static void collate(t)
register struct timeval *t;
{
    register u_long d;
    register struct timeval tp;
    register u_long delta;
    
    GET_TIME(tp);
    
    if (TV_LT(*t, tp))
    {
      TV_DELTA(tp, *t, delta);
      
      d = delta >> 10;
      if (d > 50)
          d = 50;
      
      ++upcall_data[d];
    }
}
#endif /* UPCALL_TIMING */

/*
 * Delete an mfc entry
 */
static int
del_mfc(mfccp)
    struct mfcctl *mfccp;
{
    struct in_addr      origin;
    struct in_addr      mcastgrp;
    struct mfc          *rt;
    struct mfc          **nptr;
    u_long        hash;
    int s;

    origin = mfccp->mfcc_origin;
    mcastgrp = mfccp->mfcc_mcastgrp;
    hash = MFCHASH(origin.s_addr, mcastgrp.s_addr);

    if (mrtdebug & DEBUG_MFC)
      log(LOG_DEBUG,"del_mfc orig %lx mcastgrp %lx\n",
          (u_long)ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr));

    s = splnet();

    nptr = &mfctable[hash];
    while ((rt = *nptr) != NULL) {
      if (origin.s_addr == rt->mfc_origin.s_addr &&
          mcastgrp.s_addr == rt->mfc_mcastgrp.s_addr &&
          rt->mfc_stall == NULL)
          break;

      nptr = &rt->mfc_next;
    }
    if (rt == NULL) {
      splx(s);
      return EADDRNOTAVAIL;
    }

    *nptr = rt->mfc_next;
    free(rt, M_MRTABLE);

    splx(s);

    return 0;
}

/*
 * Send a message to mrouted on the multicast routing socket
 */
static int
socket_send(s, mm, src)
      struct socket *s;
      struct mbuf *mm;
      struct sockaddr_in *src;
{
      if (s) {
            if (sbappendaddr(&s->so_rcv,
                         (struct sockaddr *)src,
                         mm, (struct mbuf *)0) != 0) {
                  sorwakeup(s);
                  return 0;
            }
      }
      m_freem(mm);
      return -1;
}

/*
 * IP multicast forwarding function. This function assumes that the packet
 * pointed to by "ip" has arrived on (or is about to be sent to) the interface
 * pointed to by "ifp", and the packet is to be relayed to other networks
 * that have members of the packet's destination IP multicast group.
 *
 * The packet is returned unscathed to the caller, unless it is
 * erroneous, in which case a non-zero return value tells the caller to
 * discard it.
 */

#define IP_HDR_LEN  20  /* # bytes of fixed IP header (excluding options) */
#define TUNNEL_LEN  12  /* # bytes of IP option for tunnel encapsulation  */

static int
X_ip_mforward(ip, ifp, m, imo)
    register struct ip *ip;
    struct ifnet *ifp;
    struct mbuf *m;
    struct ip_moptions *imo;
{
    register struct mfc *rt;
    register u_char *ipoptions;
    static struct sockaddr_in       k_igmpsrc   = { sizeof k_igmpsrc, AF_INET };
    static int srctun = 0;
    register struct mbuf *mm;
    int s;
    vifi_t vifi;
    struct vif *vifp;

    if (mrtdebug & DEBUG_FORWARD)
      log(LOG_DEBUG, "ip_mforward: src %lx, dst %lx, ifp %p\n",
          (u_long)ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr),
          (void *)ifp);

    if (ip->ip_hl < (IP_HDR_LEN + TUNNEL_LEN) >> 2 ||
      (ipoptions = (u_char *)(ip + 1))[1] != IPOPT_LSRR ) {
      /*
       * Packet arrived via a physical interface or
       * an encapsulated tunnel.
       */
    } else {
      /*
       * Packet arrived through a source-route tunnel.
       * Source-route tunnels are no longer supported.
       */
      if ((srctun++ % 1000) == 0)
          log(LOG_ERR,
            "ip_mforward: received source-routed packet from %lx\n",
            (u_long)ntohl(ip->ip_src.s_addr));

      return 1;
    }

    if ((imo) && ((vifi = imo->imo_multicast_vif) < numvifs)) {
      if (ip->ip_ttl < 255)
            ip->ip_ttl++;     /* compensate for -1 in *_send routines */
      if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) {
          vifp = viftable + vifi;
          printf("Sending IPPROTO_RSVP from %lx to %lx on vif %d (%s%s%d)\n",
            ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr), vifi,
            (vifp->v_flags & VIFF_TUNNEL) ? "tunnel on " : "",
            vifp->v_ifp->if_name, vifp->v_ifp->if_unit);
      }
      return (ip_mdq(m, ifp, NULL, vifi));
    }
    if (rsvpdebug && ip->ip_p == IPPROTO_RSVP) {
      printf("Warning: IPPROTO_RSVP from %lx to %lx without vif option\n",
          ntohl(ip->ip_src.s_addr), ntohl(ip->ip_dst.s_addr));
      if(!imo)
            printf("In fact, no options were specified at all\n");
    }

    /*
     * Don't forward a packet with time-to-live of zero or one,
     * or a packet destined to a local-only group.
     */
    if (ip->ip_ttl <= 1 ||
      ntohl(ip->ip_dst.s_addr) <= INADDR_MAX_LOCAL_GROUP)
      return 0;

    /*
     * Determine forwarding vifs from the forwarding cache table
     */
    s = splnet();
    MFCFIND(ip->ip_src.s_addr, ip->ip_dst.s_addr, rt);

    /* Entry exists, so forward if necessary */
    if (rt != NULL) {
      splx(s);
      return (ip_mdq(m, ifp, rt, -1));
    } else {
      /*
       * If we don't have a route for packet's origin,
       * Make a copy of the packet &
       * send message to routing daemon
       */

      register struct mbuf *mb0;
      register struct rtdetq *rte;
      register u_long hash;
      int hlen = ip->ip_hl << 2;
#ifdef UPCALL_TIMING
      struct timeval tp;

      GET_TIME(tp);
#endif

      mrtstat.mrts_no_route++;
      if (mrtdebug & (DEBUG_FORWARD | DEBUG_MFC))
          log(LOG_DEBUG, "ip_mforward: no rte s %lx g %lx\n",
            (u_long)ntohl(ip->ip_src.s_addr),
            (u_long)ntohl(ip->ip_dst.s_addr));

      /*
       * Allocate mbufs early so that we don't do extra work if we are
       * just going to fail anyway.  Make sure to pullup the header so
       * that other people can't step on it.
       */
      rte = (struct rtdetq *)malloc((sizeof *rte), M_MRTABLE, M_NOWAIT);
      if (rte == NULL) {
          splx(s);
          return ENOBUFS;
      }
      mb0 = m_copy(m, 0, M_COPYALL);
      if (mb0 && (M_HASCL(mb0) || mb0->m_len < hlen))
          mb0 = m_pullup(mb0, hlen);
      if (mb0 == NULL) {
          free(rte, M_MRTABLE);
          splx(s);
          return ENOBUFS;
      }

      /* is there an upcall waiting for this packet? */
      hash = MFCHASH(ip->ip_src.s_addr, ip->ip_dst.s_addr);
      for (rt = mfctable[hash]; rt; rt = rt->mfc_next) {
          if ((ip->ip_src.s_addr == rt->mfc_origin.s_addr) &&
            (ip->ip_dst.s_addr == rt->mfc_mcastgrp.s_addr) &&
            (rt->mfc_stall != NULL))
            break;
      }

      if (rt == NULL) {
          int i;
          struct igmpmsg *im;

          /* no upcall, so make a new entry */
          rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT);
          if (rt == NULL) {
            free(rte, M_MRTABLE);
            m_freem(mb0);
            splx(s);
            return ENOBUFS;
          }
          /* Make a copy of the header to send to the user level process */
          mm = m_copy(mb0, 0, hlen);
          if (mm == NULL) {
            free(rte, M_MRTABLE);
            m_freem(mb0);
            free(rt, M_MRTABLE);
            splx(s);
            return ENOBUFS;
          }

          /* 
           * Send message to routing daemon to install 
           * a route into the kernel table
           */
          k_igmpsrc.sin_addr = ip->ip_src;
          
          im = mtod(mm, struct igmpmsg *);
          im->im_msgtype      = IGMPMSG_NOCACHE;
          im->im_mbz          = 0;

          mrtstat.mrts_upcalls++;

          if (socket_send(ip_mrouter, mm, &k_igmpsrc) < 0) {
            log(LOG_WARNING, "ip_mforward: ip_mrouter socket queue full\n");
            ++mrtstat.mrts_upq_sockfull;
            free(rte, M_MRTABLE);
            m_freem(mb0);
            free(rt, M_MRTABLE);
            splx(s);
            return ENOBUFS;
          }

          /* insert new entry at head of hash chain */
          rt->mfc_origin.s_addr     = ip->ip_src.s_addr;
          rt->mfc_mcastgrp.s_addr   = ip->ip_dst.s_addr;
          rt->mfc_expire            = UPCALL_EXPIRE;
          nexpire[hash]++;
          for (i = 0; i < numvifs; i++)
            rt->mfc_ttls[i] = 0;
          rt->mfc_parent = -1;

          /* link into table */
          rt->mfc_next   = mfctable[hash];
          mfctable[hash] = rt;
          rt->mfc_stall = rte;

      } else {
          /* determine if q has overflowed */
          int npkts = 0;
          struct rtdetq **p;

          for (p = &rt->mfc_stall; *p != NULL; p = &(*p)->next)
            npkts++;

          if (npkts > MAX_UPQ) {
            mrtstat.mrts_upq_ovflw++;
            free(rte, M_MRTABLE);
            m_freem(mb0);
            splx(s);
            return 0;
          }

          /* Add this entry to the end of the queue */
          *p = rte;
      }

      rte->m                  = mb0;
      rte->ifp          = ifp;
#ifdef UPCALL_TIMING
      rte->t                  = tp;
#endif
      rte->next         = NULL;

      splx(s);

      return 0;
    }       
}

#ifndef MROUTE_LKM
int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
               struct ip_moptions *) = X_ip_mforward;
#endif

/*
 * Clean up the cache entry if upcall is not serviced
 */
static void
expire_upcalls(void *unused)
{
    struct rtdetq *rte;
    struct mfc *mfc, **nptr;
    int i;
    int s;

    s = splnet();
    for (i = 0; i < MFCTBLSIZ; i++) {
      if (nexpire[i] == 0)
          continue;
      nptr = &mfctable[i];
      for (mfc = *nptr; mfc != NULL; mfc = *nptr) {
          /*
           * Skip real cache entries
           * Make sure it wasn't marked to not expire (shouldn't happen)
           * If it expires now
           */
          if (mfc->mfc_stall != NULL &&
              mfc->mfc_expire != 0 &&
            --mfc->mfc_expire == 0) {
            if (mrtdebug & DEBUG_EXPIRE)
                log(LOG_DEBUG, "expire_upcalls: expiring (%lx %lx)\n",
                  (u_long)ntohl(mfc->mfc_origin.s_addr),
                  (u_long)ntohl(mfc->mfc_mcastgrp.s_addr));
            /*
             * drop all the packets
             * free the mbuf with the pkt, if, timing info
             */
            for (rte = mfc->mfc_stall; rte; ) {
                struct rtdetq *n = rte->next;

                m_freem(rte->m);
                free(rte, M_MRTABLE);
                rte = n;
            }
            ++mrtstat.mrts_cache_cleanups;
            nexpire[i]--;

            *nptr = mfc->mfc_next;
            free(mfc, M_MRTABLE);
          } else {
            nptr = &mfc->mfc_next;
          }
      }
    }
    splx(s);
    expire_upcalls_ch = timeout(expire_upcalls, (caddr_t)NULL, EXPIRE_TIMEOUT);
}

/*
 * Packet forwarding routine once entry in the cache is made
 */
static int
ip_mdq(m, ifp, rt, xmt_vif)
    register struct mbuf *m;
    register struct ifnet *ifp;
    register struct mfc *rt;
    register vifi_t xmt_vif;
{
    register struct ip  *ip = mtod(m, struct ip *);
    register vifi_t vifi;
    register struct vif *vifp;
    register int plen = ip->ip_len;

/*
 * Macro to send packet on vif.  Since RSVP packets don't get counted on
 * input, they shouldn't get counted on output, so statistics keeping is
 * seperate.
 */
#define MC_SEND(ip,vifp,m) {                             \
                if ((vifp)->v_flags & VIFF_TUNNEL)     \
                    encap_send((ip), (vifp), (m));       \
                else                                     \
                    phyint_send((ip), (vifp), (m));      \
}

    /*
     * If xmt_vif is not -1, send on only the requested vif.
     *
     * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.)
     */
    if (xmt_vif < numvifs) {
      MC_SEND(ip, viftable + xmt_vif, m);
      return 1;
    }

    /*
     * Don't forward if it didn't arrive from the parent vif for its origin.
     */
    vifi = rt->mfc_parent;
    if ((vifi >= numvifs) || (viftable[vifi].v_ifp != ifp)) {
      /* came in the wrong interface */
      if (mrtdebug & DEBUG_FORWARD)
          log(LOG_DEBUG, "wrong if: ifp %p vifi %d vififp %p\n",
            (void *)ifp, vifi, (void *)viftable[vifi].v_ifp); 
      ++mrtstat.mrts_wrong_if;
      ++rt->mfc_wrong_if;
      /*
       * If we are doing PIM assert processing, and we are forwarding
       * packets on this interface, and it is a broadcast medium
       * interface (and not a tunnel), send a message to the routing daemon.
       */
      if (pim_assert && rt->mfc_ttls[vifi] &&
            (ifp->if_flags & IFF_BROADCAST) &&
            !(viftable[vifi].v_flags & VIFF_TUNNEL)) {
          struct sockaddr_in k_igmpsrc;
          struct mbuf *mm;
          struct igmpmsg *im;
          int hlen = ip->ip_hl << 2;
          struct timeval now;
          register u_long delta;

          GET_TIME(now);

          TV_DELTA(rt->mfc_last_assert, now, delta);

          if (delta > ASSERT_MSG_TIME) {
            mm = m_copy(m, 0, hlen);
            if (mm && (M_HASCL(mm) || mm->m_len < hlen))
                mm = m_pullup(mm, hlen);
            if (mm == NULL) {
                return ENOBUFS;
            }

            rt->mfc_last_assert = now;

            im = mtod(mm, struct igmpmsg *);
            im->im_msgtype    = IGMPMSG_WRONGVIF;
            im->im_mbz        = 0;
            im->im_vif        = vifi;

            k_igmpsrc.sin_addr = im->im_src;

            socket_send(ip_mrouter, mm, &k_igmpsrc);
          }
      }
      return 0;
    }

    /* If I sourced this packet, it counts as output, else it was input. */
    if (ip->ip_src.s_addr == viftable[vifi].v_lcl_addr.s_addr) {
      viftable[vifi].v_pkt_out++;
      viftable[vifi].v_bytes_out += plen;
    } else {
      viftable[vifi].v_pkt_in++;
      viftable[vifi].v_bytes_in += plen;
    }
    rt->mfc_pkt_cnt++;
    rt->mfc_byte_cnt += plen;

    /*
     * For each vif, decide if a copy of the packet should be forwarded.
     * Forward if:
     *            - the ttl exceeds the vif's threshold
     *            - there are group members downstream on interface
     */
    for (vifp = viftable, vifi = 0; vifi < numvifs; vifp++, vifi++)
      if ((rt->mfc_ttls[vifi] > 0) &&
          (ip->ip_ttl > rt->mfc_ttls[vifi])) {
          vifp->v_pkt_out++;
          vifp->v_bytes_out += plen;
          MC_SEND(ip, vifp, m);
      }

    return 0;
}

/*
 * check if a vif number is legal/ok. This is used by ip_output, to export
 * numvifs there, 
 */
static int
X_legal_vif_num(vif)
    int vif;
{
    if (vif >= 0 && vif < numvifs)
       return(1);
    else
       return(0);
}

#ifndef MROUTE_LKM
int (*legal_vif_num)(int) = X_legal_vif_num;
#endif

/*
 * Return the local address used by this vif
 */
static u_long
X_ip_mcast_src(vifi)
    int vifi;
{
    if (vifi >= 0 && vifi < numvifs)
      return viftable[vifi].v_lcl_addr.s_addr;
    else
      return INADDR_ANY;
}

#ifndef MROUTE_LKM
u_long (*ip_mcast_src)(int) = X_ip_mcast_src;
#endif

static void
phyint_send(ip, vifp, m)
    struct ip *ip;
    struct vif *vifp;
    struct mbuf *m;
{
    register struct mbuf *mb_copy;
    register int hlen = ip->ip_hl << 2;

    /*
     * Make a new reference to the packet; make sure that
     * the IP header is actually copied, not just referenced,
     * so that ip_output() only scribbles on the copy.
     */
    mb_copy = m_copy(m, 0, M_COPYALL);
    if (mb_copy && (M_HASCL(mb_copy) || mb_copy->m_len < hlen))
      mb_copy = m_pullup(mb_copy, hlen);
    if (mb_copy == NULL)
      return;

    if (vifp->v_rate_limit == 0)
      tbf_send_packet(vifp, mb_copy);
    else
      tbf_control(vifp, mb_copy, mtod(mb_copy, struct ip *), ip->ip_len);
}

static void
encap_send(ip, vifp, m)
    register struct ip *ip;
    register struct vif *vifp;
    register struct mbuf *m;
{
    register struct mbuf *mb_copy;
    register struct ip *ip_copy;
    register int i, len = ip->ip_len;

    /*
     * copy the old packet & pullup its IP header into the
     * new mbuf so we can modify it.  Try to fill the new
     * mbuf since if we don't the ethernet driver will.
     */
    MGETHDR(mb_copy, M_DONTWAIT, MT_HEADER);
    if (mb_copy == NULL)
      return;
    mb_copy->m_data += max_linkhdr;
    mb_copy->m_len = sizeof(multicast_encap_iphdr);

    if ((mb_copy->m_next = m_copy(m, 0, M_COPYALL)) == NULL) {
      m_freem(mb_copy);
      return;
    }
    i = MHLEN - M_LEADINGSPACE(mb_copy);
    if (i > len)
      i = len;
    mb_copy = m_pullup(mb_copy, i);
    if (mb_copy == NULL)
      return;
    mb_copy->m_pkthdr.len = len + sizeof(multicast_encap_iphdr);

    /*
     * fill in the encapsulating IP header.
     */
    ip_copy = mtod(mb_copy, struct ip *);
    *ip_copy = multicast_encap_iphdr;
#ifdef RANDOM_IP_ID
    ip_copy->ip_id = ip_randomid();
#else
    ip_copy->ip_id = htons(ip_id++);
#endif
    ip_copy->ip_len += len;
    ip_copy->ip_src = vifp->v_lcl_addr;
    ip_copy->ip_dst = vifp->v_rmt_addr;

    /*
     * turn the encapsulated IP header back into a valid one.
     */
    ip = (struct ip *)((caddr_t)ip_copy + sizeof(multicast_encap_iphdr));
    --ip->ip_ttl;
    HTONS(ip->ip_len);
    HTONS(ip->ip_off);
    ip->ip_sum = 0;
    mb_copy->m_data += sizeof(multicast_encap_iphdr);
    ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2);
    mb_copy->m_data -= sizeof(multicast_encap_iphdr);

    if (vifp->v_rate_limit == 0)
      tbf_send_packet(vifp, mb_copy);
    else
      tbf_control(vifp, mb_copy, ip, ip_copy->ip_len);
}

/*
 * De-encapsulate a packet and feed it back through ip input (this
 * routine is called whenever IP gets a packet with proto type
 * ENCAP_PROTO and a local destination address).
 */
void
#ifdef MROUTE_LKM
X_ipip_input(m, off)
#else
ipip_input(m, off)
#endif
      register struct mbuf *m;
      int off;
{
    struct ifnet *ifp = m->m_pkthdr.rcvif;
    register struct ip *ip = mtod(m, struct ip *);
    register int hlen = ip->ip_hl << 2;
    register int s;
    register struct ifqueue *ifq;
    register struct vif *vifp;

    if (!have_encap_tunnel) {
          rip_input(m, off);
          return;
    }
    /*
     * dump the packet if it's not to a multicast destination or if
     * we don't have an encapsulating tunnel with the source.
     * Note:  This code assumes that the remote site IP address
     * uniquely identifies the tunnel (i.e., that this site has
     * at most one tunnel with the remote site).
     */
    if (! IN_MULTICAST(ntohl(((struct ip *)((char *)ip + hlen))->ip_dst.s_addr))) {
      ++mrtstat.mrts_bad_tunnel;
      m_freem(m);
      return;
    }
    if (ip->ip_src.s_addr != last_encap_src) {
      register struct vif *vife;
      
      vifp = viftable;
      vife = vifp + numvifs;
      last_encap_src = ip->ip_src.s_addr;
      last_encap_vif = 0;
      for ( ; vifp < vife; ++vifp)
          if (vifp->v_rmt_addr.s_addr == ip->ip_src.s_addr) {
            if ((vifp->v_flags & (VIFF_TUNNEL|VIFF_SRCRT))
                == VIFF_TUNNEL)
                last_encap_vif = vifp;
            break;
          }
    }
    if ((vifp = last_encap_vif) == 0) {
      last_encap_src = 0;
      mrtstat.mrts_cant_tunnel++; /*XXX*/
      m_freem(m);
      if (mrtdebug)
        log(LOG_DEBUG, "ip_mforward: no tunnel with %lx\n",
            (u_long)ntohl(ip->ip_src.s_addr));
      return;
    }
    ifp = vifp->v_ifp;

    if (hlen > IP_HDR_LEN)
      ip_stripoptions(m, (struct mbuf *) 0);
    m->m_data += IP_HDR_LEN;
    m->m_len -= IP_HDR_LEN;
    m->m_pkthdr.len -= IP_HDR_LEN;
    m->m_pkthdr.rcvif = ifp;

    ifq = &ipintrq;
    s = splimp();
    if (IF_QFULL(ifq)) {
      IF_DROP(ifq);
      m_freem(m);
    } else {
      IF_ENQUEUE(ifq, m);
      /*
       * normally we would need a "schednetisr(NETISR_IP)"
       * here but we were called by ip_input and it is going
       * to loop back & try to dequeue the packet we just
       * queued as soon as we return so we avoid the
       * unnecessary software interrrupt.
       */
    }
    splx(s);
}

/*
 * Token bucket filter module
 */

static void
tbf_control(vifp, m, ip, p_len)
      register struct vif *vifp;
      register struct mbuf *m;
      register struct ip *ip;
      register u_long p_len;
{
    register struct tbf *t = vifp->v_tbf;

    if (p_len > MAX_BKT_SIZE) {
      /* drop if packet is too large */
      mrtstat.mrts_pkt2large++;
      m_freem(m);
      return;
    }

    tbf_update_tokens(vifp);

    /* if there are enough tokens, 
     * and the queue is empty,
     * send this packet out
     */

    if (t->tbf_q_len == 0) {
      /* queue empty, send packet if enough tokens */
      if (p_len <= t->tbf_n_tok) {
          t->tbf_n_tok -= p_len;
          tbf_send_packet(vifp, m);
      } else {
          /* queue packet and timeout till later */
          tbf_queue(vifp, m);
          timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS);
      }
    } else if (t->tbf_q_len < t->tbf_max_q_len) {
      /* finite queue length, so queue pkts and process queue */
      tbf_queue(vifp, m);
      tbf_process_q(vifp);
    } else {
      /* queue length too much, try to dq and queue and process */
      if (!tbf_dq_sel(vifp, ip)) {
          mrtstat.mrts_q_overflow++;
          m_freem(m);
          return;
      } else {
          tbf_queue(vifp, m);
          tbf_process_q(vifp);
      }
    }
    return;
}

/* 
 * adds a packet to the queue at the interface
 */
static void
tbf_queue(vifp, m) 
      register struct vif *vifp;
      register struct mbuf *m;
{
    register int s = splnet();
    register struct tbf *t = vifp->v_tbf;

    if (t->tbf_t == NULL) {
      /* Queue was empty */
      t->tbf_q = m;
    } else {
      /* Insert at tail */
      t->tbf_t->m_act = m;
    }

    /* Set new tail pointer */
    t->tbf_t = m;

#ifdef DIAGNOSTIC
    /* Make sure we didn't get fed a bogus mbuf */
    if (m->m_act)
      panic("tbf_queue: m_act");
#endif
    m->m_act = NULL;

    t->tbf_q_len++;

    splx(s);
}


/* 
 * processes the queue at the interface
 */
static void
tbf_process_q(vifp)
    register struct vif *vifp;
{
    register struct mbuf *m;
    register int len;
    register int s = splnet();
    register struct tbf *t = vifp->v_tbf;

    /* loop through the queue at the interface and send as many packets
     * as possible
     */
    while (t->tbf_q_len > 0) {
      m = t->tbf_q;

      len = mtod(m, struct ip *)->ip_len;

      /* determine if the packet can be sent */
      if (len <= t->tbf_n_tok) {
          /* if so,
           * reduce no of tokens, dequeue the packet,
           * send the packet.
           */
          t->tbf_n_tok -= len;

          t->tbf_q = m->m_act;
          if (--t->tbf_q_len == 0)
            t->tbf_t = NULL;

          m->m_act = NULL;
          tbf_send_packet(vifp, m);

      } else break;
    }
    splx(s);
}

static void
tbf_reprocess_q(xvifp)
      void *xvifp;
{
    register struct vif *vifp = xvifp;
    if (ip_mrouter == NULL) 
      return;

    tbf_update_tokens(vifp);

    tbf_process_q(vifp);

    if (vifp->v_tbf->tbf_q_len)
      timeout(tbf_reprocess_q, (caddr_t)vifp, TBF_REPROCESS);
}

/* function that will selectively discard a member of the queue
 * based on the precedence value and the priority
 */
static int
tbf_dq_sel(vifp, ip)
    register struct vif *vifp;
    register struct ip *ip;
{
    register int s = splnet();
    register u_int p;
    register struct mbuf *m, *last;
    register struct mbuf **np;
    register struct tbf *t = vifp->v_tbf;

    p = priority(vifp, ip);

    np = &t->tbf_q;
    last = NULL;
    while ((m = *np) != NULL) {
      if (p > priority(vifp, mtod(m, struct ip *))) {
          *np = m->m_act;
          /* If we're removing the last packet, fix the tail pointer */
          if (m == t->tbf_t)
            t->tbf_t = last;
          m_freem(m);
          /* it's impossible for the queue to be empty, but
           * we check anyway. */
          if (--t->tbf_q_len == 0)
            t->tbf_t = NULL;
          splx(s);
          mrtstat.mrts_drop_sel++;
          return(1);
      }
      np = &m->m_act;
      last = m;
    }
    splx(s);
    return(0);
}

static void
tbf_send_packet(vifp, m)
    register struct vif *vifp;
    register struct mbuf *m;
{
    struct ip_moptions imo;
    int error;
    static struct route ro;
    int s = splnet();

    if (vifp->v_flags & VIFF_TUNNEL) {
      /* If tunnel options */
      ip_output(m, (struct mbuf *)0, &vifp->v_route,
              IP_FORWARDING, (struct ip_moptions *)0);
    } else {
      imo.imo_multicast_ifp  = vifp->v_ifp;
      imo.imo_multicast_ttl  = mtod(m, struct ip *)->ip_ttl - 1;
      imo.imo_multicast_loop = 1;
      imo.imo_multicast_vif  = -1;

      /*
       * Re-entrancy should not be a problem here, because
       * the packets that we send out and are looped back at us
       * should get rejected because they appear to come from
       * the loopback interface, thus preventing looping.
       */
      error = ip_output(m, (struct mbuf *)0, &ro,
                    IP_FORWARDING, &imo);

      if (mrtdebug & DEBUG_XMIT)
          log(LOG_DEBUG, "phyint_send on vif %d err %d\n", 
            vifp - viftable, error);
    }
    splx(s);
}

/* determine the current time and then
 * the elapsed time (between the last time and time now)
 * in milliseconds & update the no. of tokens in the bucket
 */
static void
tbf_update_tokens(vifp)
    register struct vif *vifp;
{
    struct timeval tp;
    register u_long tm;
    register int s = splnet();
    register struct tbf *t = vifp->v_tbf;

    GET_TIME(tp);

    TV_DELTA(tp, t->tbf_last_pkt_t, tm);

    /*
     * This formula is actually
     * "time in seconds" * "bytes/second".
     *
     * (tm / 1000000) * (v_rate_limit * 1000 * (1000/1024) / 8)
     *
     * The (1000/1024) was introduced in add_vif to optimize
     * this divide into a shift.
     */
    t->tbf_n_tok += tm * vifp->v_rate_limit / 1024 / 8;
    t->tbf_last_pkt_t = tp;

    if (t->tbf_n_tok > MAX_BKT_SIZE)
      t->tbf_n_tok = MAX_BKT_SIZE;

    splx(s);
}

static int
priority(vifp, ip)
    register struct vif *vifp;
    register struct ip *ip;
{
    register int prio;

    /* temporary hack; may add general packet classifier some day */

    /*
     * The UDP port space is divided up into four priority ranges:
     * [0, 16384)     : unclassified - lowest priority
     * [16384, 32768) : audio - highest priority
     * [32768, 49152) : whiteboard - medium priority
     * [49152, 65536) : video - low priority
     */
    if (ip->ip_p == IPPROTO_UDP) {
      struct udphdr *udp = (struct udphdr *)(((char *)ip) + (ip->ip_hl << 2));
      switch (ntohs(udp->uh_dport) & 0xc000) {
          case 0x4000:
            prio = 70;
            break;
          case 0x8000:
            prio = 60;
            break;
          case 0xc000:
            prio = 55;
            break;
          default:
            prio = 50;
            break;
      }
      if (tbfdebug > 1)
            log(LOG_DEBUG, "port %x prio%d\n", ntohs(udp->uh_dport), prio);
    } else {
          prio = 50;
    }
    return prio;
}

/*
 * End of token bucket filter modifications 
 */

int
ip_rsvp_vif_init(so, sopt)
      struct socket *so;
      struct sockopt *sopt;
{
    int error, i, s;

    if (rsvpdebug)
      printf("ip_rsvp_vif_init: so_type = %d, pr_protocol = %d\n",
             so->so_type, so->so_proto->pr_protocol);

    if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP)
      return EOPNOTSUPP;

    /* Check mbuf. */
    error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
    if (error)
          return (error);
 
    if (rsvpdebug)
      printf("ip_rsvp_vif_init: vif = %d rsvp_on = %d\n", i, rsvp_on);
 
    s = splnet();

    /* Check vif. */
    if (!legal_vif_num(i)) {
      splx(s);
      return EADDRNOTAVAIL;
    }

    /* Check if socket is available. */
    if (viftable[i].v_rsvpd != NULL) {
      splx(s);
      return EADDRINUSE;
    }

    viftable[i].v_rsvpd = so;
    /* This may seem silly, but we need to be sure we don't over-increment
     * the RSVP counter, in case something slips up.
     */
    if (!viftable[i].v_rsvp_on) {
      viftable[i].v_rsvp_on = 1;
      rsvp_on++;
    }

    splx(s);
    return 0;
}

int
ip_rsvp_vif_done(so, sopt)
      struct socket *so;
      struct sockopt *sopt;
{
      int error, i, s;
 
      if (rsvpdebug)
            printf("ip_rsvp_vif_done: so_type = %d, pr_protocol = %d\n",
                   so->so_type, so->so_proto->pr_protocol);
 
      if (so->so_type != SOCK_RAW || 
          so->so_proto->pr_protocol != IPPROTO_RSVP)
            return EOPNOTSUPP;
 
      error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
      if (error)
            return (error);
 
      s = splnet();
 
      /* Check vif. */
      if (!legal_vif_num(i)) {
            splx(s);
            return EADDRNOTAVAIL;
      }

      if (rsvpdebug)
            printf("ip_rsvp_vif_done: v_rsvpd = %p so = %p\n",
                   viftable[i].v_rsvpd, so);

      viftable[i].v_rsvpd = NULL;
      /*
       * This may seem silly, but we need to be sure we don't over-decrement
       * the RSVP counter, in case something slips up.
       */
      if (viftable[i].v_rsvp_on) {
            viftable[i].v_rsvp_on = 0;
            rsvp_on--;
      }

      splx(s);
      return 0;
}

void
ip_rsvp_force_done(so)
    struct socket *so;
{
    int vifi;
    register int s;

    /* Don't bother if it is not the right type of socket. */
    if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_RSVP)
      return;

    s = splnet();

    /* The socket may be attached to more than one vif...this
     * is perfectly legal.
     */
    for (vifi = 0; vifi < numvifs; vifi++) {
      if (viftable[vifi].v_rsvpd == so) {
          viftable[vifi].v_rsvpd = NULL;
          /* This may seem silly, but we need to be sure we don't
           * over-decrement the RSVP counter, in case something slips up.
           */
          if (viftable[vifi].v_rsvp_on) {
            viftable[vifi].v_rsvp_on = 0;
            rsvp_on--;
          }
      }
    }

    splx(s);
    return;
}

void
rsvp_input(m, off)
      struct mbuf *m;
      int off;
{
    int vifi;
    register struct ip *ip = mtod(m, struct ip *);
    int proto = ip->ip_p;
    static struct sockaddr_in rsvp_src = { sizeof rsvp_src, AF_INET };
    register int s;
    struct ifnet *ifp;
#ifdef ALTQ
    /* support IP_RECVIF used by rsvpd rel4.2a1 */
    struct inpcb *inp;
    struct socket *so;
    struct mbuf *opts;
#endif

    if (rsvpdebug)
      printf("rsvp_input: rsvp_on %d\n",rsvp_on);

    /* Can still get packets with rsvp_on = 0 if there is a local member
     * of the group to which the RSVP packet is addressed.  But in this
     * case we want to throw the packet away.
     */
    if (!rsvp_on) {
      m_freem(m);
      return;
    }

    s = splnet();

    if (rsvpdebug)
      printf("rsvp_input: check vifs\n");

#ifdef DIAGNOSTIC
    if (!(m->m_flags & M_PKTHDR))
          panic("rsvp_input no hdr");
#endif

    ifp = m->m_pkthdr.rcvif;
    /* Find which vif the packet arrived on. */
    for (vifi = 0; vifi < numvifs; vifi++)
      if (viftable[vifi].v_ifp == ifp)
          break;

#ifdef ALTQ
    if (vifi == numvifs || (so = viftable[vifi].v_rsvpd) == NULL) {
#else
    if (vifi == numvifs || viftable[vifi].v_rsvpd == NULL) {
#endif
      /*
       * If the old-style non-vif-associated socket is set,
       * then use it.  Otherwise, drop packet since there
       * is no specific socket for this vif.
       */
      if (ip_rsvpd != NULL) {
          if (rsvpdebug)
            printf("rsvp_input: Sending packet up old-style socket\n");
          rip_input(m, off);  /* xxx */
      } else {
          if (rsvpdebug && vifi == numvifs)
            printf("rsvp_input: Can't find vif for packet.\n");
          else if (rsvpdebug && viftable[vifi].v_rsvpd == NULL)
            printf("rsvp_input: No socket defined for vif %d\n",vifi);
          m_freem(m);
      }
      splx(s);
      return;
    }
    rsvp_src.sin_addr = ip->ip_src;

    if (rsvpdebug && m)
      printf("rsvp_input: m->m_len = %d, sbspace() = %ld\n",
             m->m_len,sbspace(&(viftable[vifi].v_rsvpd->so_rcv)));

#ifdef ALTQ
    opts = NULL;
    inp = (struct inpcb *)so->so_pcb;
    if (inp->inp_flags & INP_CONTROLOPTS ||
      inp->inp_socket->so_options & SO_TIMESTAMP)
      ip_savecontrol(inp, &opts, ip, m);
    if (sbappendaddr(&so->so_rcv,
                 (struct sockaddr *)&rsvp_src,m, opts) == 0) {
      m_freem(m);
      if (opts)
          m_freem(opts);
      if (rsvpdebug)
          printf("rsvp_input: Failed to append to socket\n");
    }
    else {
      sorwakeup(so);
      if (rsvpdebug)
          printf("rsvp_input: send packet up\n");
    }
#else /* !ALTQ */
    if (socket_send(viftable[vifi].v_rsvpd, m, &rsvp_src) < 0) {
      if (rsvpdebug)
          printf("rsvp_input: Failed to append to socket\n");
    } else {
      if (rsvpdebug)
          printf("rsvp_input: send packet up\n");
    }
#endif /* !ALTQ */

    splx(s);
}

#ifdef MROUTE_LKM
#include <sys/conf.h>
#include <sys/exec.h>
#include <sys/sysent.h>
#include <sys/lkm.h>

MOD_MISC("ip_mroute_mod")

static int
ip_mroute_mod_handle(struct lkm_table *lkmtp, int cmd)
{
      int i;
      struct lkm_misc   *args = lkmtp->private.lkm_misc;
      int err = 0;

      switch(cmd) {
            static int (*old_ip_mrouter_cmd)();
            static int (*old_ip_mrouter_done)();
            static int (*old_ip_mforward)();
            static int (*old_mrt_ioctl)();
            static void (*old_proto4_input)();
            static int (*old_legal_vif_num)();
            extern struct protosw inetsw[];

      case LKM_E_LOAD:
            if(lkmexists(lkmtp) || ip_mrtproto)
              return(EEXIST);
            old_ip_mrouter_cmd = ip_mrouter_cmd;
            ip_mrouter_cmd = X_ip_mrouter_cmd;
            old_ip_mrouter_done = ip_mrouter_done;
            ip_mrouter_done = X_ip_mrouter_done;
            old_ip_mforward = ip_mforward;
            ip_mforward = X_ip_mforward;
            old_mrt_ioctl = mrt_ioctl;
            mrt_ioctl = X_mrt_ioctl;
              old_proto4_input = inetsw[ip_protox[ENCAP_PROTO]].pr_input;
              inetsw[ip_protox[ENCAP_PROTO]].pr_input = X_ipip_input;
            old_legal_vif_num = legal_vif_num;
            legal_vif_num = X_legal_vif_num;
            ip_mrtproto = IGMP_DVMRP;

            printf("\nIP multicast routing loaded\n");
            break;

      case LKM_E_UNLOAD:
            if (ip_mrouter)
              return EINVAL;

            ip_mrouter_cmd = old_ip_mrouter_cmd;
            ip_mrouter_done = old_ip_mrouter_done;
            ip_mforward = old_ip_mforward;
            mrt_ioctl = old_mrt_ioctl;
              inetsw[ip_protox[ENCAP_PROTO]].pr_input = old_proto4_input;
            legal_vif_num = old_legal_vif_num;
            ip_mrtproto = 0;
            break;

      default:
            err = EINVAL;
            break;
      }

      return(err);
}

int
ip_mroute_mod(struct lkm_table *lkmtp, int cmd, int ver) {
      DISPATCH(lkmtp, cmd, ver, ip_mroute_mod_handle, ip_mroute_mod_handle,
             nosys);
}

#endif /* MROUTE_LKM */
#endif /* MROUTING */

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