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NetBSD/usr.sbin/pim6sd/route.c

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/* $NetBSD: route.c,v 1.2 2000/07/23 23:05:38 mycroft Exp $ */
/*
* Copyright (c) 1998 by the University of Southern California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation in source and binary forms for lawful
* purposes and without fee is hereby granted, provided
* that the above copyright notice appear in all copies and that both
* the copyright notice and this permission notice appear in supporting
* documentation, 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 Southern
* California and/or Information Sciences Institute.
* The name of the University of Southern California may not
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THE UNIVERSITY OF SOUTHERN CALIFORNIA DOES NOT MAKE ANY REPRESENTATIONS
* ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. 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, TITLE, AND
* NON-INFRINGEMENT.
*
* IN NO EVENT SHALL USC, OR ANY OTHER CONTRIBUTOR BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
* TORT, OR OTHER FORM OF ACTION, ARISING OUT OF OR IN CONNECTION WITH,
* THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Other copyrights might apply to parts of this software and are so
* noted when applicable.
*/
/*
* Questions concerning this software should be directed to
* Mickael Hoerdt (hoerdt@clarinet.u-strasbg.fr) LSIIT Strasbourg.
*
*/
/*
* This program has been derived from pim6dd.
* The pim6dd program is covered by the license in the accompanying file
* named "LICENSE.pim6dd".
*/
/*
* This program has been derived from pimd.
* The pimd program is covered by the license in the accompanying file
* named "LICENSE.pimd".
*
*/
#include <sys/types.h>
#include <syslog.h>
#include "pimd.h"
#include "vif.h"
#include "mrt.h"
#include "debug.h"
#include "pim6_proto.h"
#include "route.h"
#include "mld6.h"
#include "rp.h"
#include "kern.h"
#include "timer.h"
#include "inet6.h"
#include <netinet6/ip6_mroute.h>
#include <netinet/ip6.h>
#include "routesock.h"
static void process_cache_miss __P((struct mrt6msg * im));
static void process_wrong_iif __P((struct mrt6msg * im));
static void process_whole_pkt __P((char *buf));
u_int32 default_source_metric = UCAST_DEFAULT_SOURCE_METRIC;
u_int32 default_source_preference = UCAST_DEFAULT_SOURCE_PREFERENCE;
/* Return the iif for given address */
vifi_t
get_iif(address)
struct sockaddr_in6 *address;
{
struct rpfctl rpfc;
k_req_incoming(address, &rpfc);
if (IN6_IS_ADDR_UNSPECIFIED(&rpfc.rpfneighbor.sin6_addr))
return (NO_VIF);
return (rpfc.iif);
}
/* Return the PIM neighbor toward a source */
/*
* If route not found or if a local source or if a directly connected source,
* but is not PIM router, or if the first hop router is not a PIM router,
* then return NULL.
*/
pim_nbr_entry_t *
find_pim6_nbr(source)
struct sockaddr_in6 *source;
{
struct rpfctl rpfc;
pim_nbr_entry_t *pim_nbr;
struct sockaddr_in6 next_hop_router_addr;
if (local_address(source) != NO_VIF)
return (pim_nbr_entry_t *) NULL;
k_req_incoming(source, &rpfc);
if((IN6_IS_ADDR_UNSPECIFIED(&rpfc.rpfneighbor.sin6_addr))
|| (rpfc.iif == NO_VIF))
return (pim_nbr_entry_t *) NULL;
next_hop_router_addr = rpfc.rpfneighbor;
for (pim_nbr = uvifs[rpfc.iif].uv_pim_neighbors;
pim_nbr != (pim_nbr_entry_t *) NULL;
pim_nbr = pim_nbr->next)
if (inet6_equal(&pim_nbr->address,&next_hop_router_addr))
return (pim_nbr);
return (pim_nbr_entry_t *) NULL;
}
/*
* TODO: check again the exact setup if the source is local or directly
* connected!!! Yes Really for Ipv6!!
*/
/*
* TODO: XXX: change the metric and preference for all (S,G) entries per
* source or RP?
*/
/*
* TODO - If possible, this would be the place to correct set the source's
* preference and metric to that obtained from the kernel and/or unicast
* routing protocol. For now, set it to the configured default for local
* pref/metric.
*/
/*
* Set the iif, upstream router, preference and metric for the route toward
* the source. Return TRUE is the route was found, othewise FALSE. If
* srctype==PIM_IIF_SOURCE and if the source is directly connected then the
* "upstream" is set to NULL. If srcentry==PIM_IIF_RP, then "upstream" in
* case of directly connected "source" will be that "source" (if it is also
* PIM router).,
*/
int
set_incoming(srcentry_ptr, srctype)
srcentry_t *srcentry_ptr;
int srctype;
{
struct rpfctl rpfc;
struct sockaddr_in6 source = srcentry_ptr->address;
struct sockaddr_in6 neighbor_addr;
register struct uvif *v;
register pim_nbr_entry_t *n;
/* Preference will be 0 if directly connected */
srcentry_ptr->metric = 0;
srcentry_ptr->preference = 0;
if ((srcentry_ptr->incoming = local_address(&source)) != NO_VIF)
{
/* The source is a local address */
/* TODO: set the upstream to myself? */
srcentry_ptr->upstream = (pim_nbr_entry_t *) NULL;
return (TRUE);
}
if ((srcentry_ptr->incoming = find_vif_direct(&source)) != NO_VIF)
{
/*
* The source is directly connected. Check whether we are looking for
* real source or RP
*/
if (srctype == PIM_IIF_SOURCE)
{
srcentry_ptr->upstream = (pim_nbr_entry_t *) NULL;
return (TRUE);
}
else
{
/* PIM_IIF_RP */
neighbor_addr = source;
}
}
else
{
/* TODO: probably need to check the case if the iif is disabled */
/* Use the lastest resource: the kernel unicast routing table */
k_req_incoming(&source, &rpfc);
if ((rpfc.iif == NO_VIF) ||
IN6_IS_ADDR_UNSPECIFIED(&rpfc.rpfneighbor.sin6_addr))
{
/* couldn't find a route */
IF_DEBUG(DEBUG_PIM_MRT | DEBUG_RPF)
log(LOG_DEBUG, 0, "NO ROUTE found for %s",
inet6_fmt(&source.sin6_addr));
return (FALSE);
}
srcentry_ptr->incoming = rpfc.iif;
neighbor_addr = rpfc.rpfneighbor;
/* set the preference for sources that aren't directly connected. */
v = &uvifs[srcentry_ptr->incoming];
srcentry_ptr->preference = v->uv_local_pref;
srcentry_ptr->metric = v->uv_local_metric;
}
/*
* The upstream router must be a (PIM router) neighbor, otherwise we are
* in big trouble ;-).
* Yes but the neighbors are link-local and the rp is global ipv6..
*/
/* WARNING WARNING WARNING WARNING */
/* If the router is directly connected to the RP and the RP is the BSR , the next hop is
* the globally reachable addresse of the RP : NOT link local neighbor but
* a ipv6 global neighbor...
* the upstream router is the globally reachable router...
*
*/
/* WARNING WARNING WARNING WARNING */
v = &uvifs[srcentry_ptr->incoming];
if (inet6_equal(&source,&neighbor_addr))
{
srcentry_ptr->upstream=v->uv_pim_neighbors;
return (TRUE);
}
for (n = v->uv_pim_neighbors; n != NULL; n = n->next)
{
if (inet6_lessthan(&neighbor_addr,&n->address))
continue;
if (inet6_equal(&neighbor_addr,&n->address))
{
/*
* The upstream router is found in the list of neighbors. We are
* safe!
*/
srcentry_ptr->upstream = n;
IF_DEBUG(DEBUG_RPF)
log(LOG_DEBUG, 0,
"For src %s, iif is %d, next hop router is %s",
inet6_fmt(&source.sin6_addr), srcentry_ptr->incoming,
inet6_fmt(&neighbor_addr.sin6_addr));
return (TRUE);
}
else
break;
}
/* TODO: control the number of messages! */
log(LOG_INFO, 0,
"For src %s, iif is %d, next hop router is %s: NOT A PIM ROUTER",
inet6_fmt(&source.sin6_addr), srcentry_ptr->incoming,
inet6_fmt(&neighbor_addr.sin6_addr));
srcentry_ptr->upstream = (pim_nbr_entry_t *) NULL;
return (FALSE);
}
/*
* TODO: XXX: currently `source` is not used. Will be used with IGMPv3 where
* we have source-specific Join/Prune.
*/
void
add_leaf(vifi, source, group)
vifi_t vifi;
struct sockaddr_in6 *source;
struct sockaddr_in6 *group;
{
mrtentry_t *mrtentry_ptr;
if_set old_oifs;
if_set new_oifs;
if_set new_leaves;
mrtentry_ptr = find_route(&sockaddr6_any, group, MRTF_WC, CREATE);
if (mrtentry_ptr == (mrtentry_t *) NULL)
return;
if ((mrtentry_ptr->incoming == vifi)
&& (!(uvifs[vifi].uv_flags & VIFF_DR)))
{
/*
* The report is received on the iif for this routing entry and I am
* not the DR for that subnet. Ignore it.
*/
if (mrtentry_ptr->flags & MRTF_NEW)
delete_mrtentry(mrtentry_ptr);
return;
}
IF_DEBUG(DEBUG_MRT)
log(LOG_DEBUG, 0, "Adding vif %d for group %s", vifi,
inet6_fmt(&group->sin6_addr));
if (IF_ISSET(vifi, &mrtentry_ptr->leaves))
return; /* Already a leaf */
calc_oifs(mrtentry_ptr, &old_oifs);
IF_COPY(&mrtentry_ptr->leaves, &new_leaves);
IF_SET(vifi, &new_leaves); /* Add the leaf */
change_interfaces(mrtentry_ptr,
mrtentry_ptr->incoming,
&mrtentry_ptr->joined_oifs,
&mrtentry_ptr->pruned_oifs,
&new_leaves,
&mrtentry_ptr->asserted_oifs, 0);
calc_oifs(mrtentry_ptr, &new_oifs);
if ((mrtentry_ptr->flags & MRTF_NEW)
|| (IF_ISEMPTY(&old_oifs) && (!IF_ISEMPTY(&new_oifs))))
{
/*
* A new created entry or the oifs have changed from NULL to
* non-NULL.
*/
mrtentry_ptr->flags &= ~MRTF_NEW;
FIRE_TIMER(mrtentry_ptr->jp_timer); /* Timeout the Join/Prune
* timer */
/*
* TODO: explicitly call the function below?
* send_pim6_join_prune(mrtentry_ptr->upstream->vifi,
* mrtentry_ptr->upstream, pim_join_prune_holdtime);
*/
}
}
/*
* TODO: XXX: currently `source` is not used. To be used with IGMPv3 where we
* have source-specific joins/prunes.
*/
void
delete_leaf(vifi, source, group)
vifi_t vifi;
struct sockaddr_in6 *source;
struct sockaddr_in6 *group;
{
mrtentry_t *mrtentry_ptr;
mrtentry_t *mrtentry_srcs;
if_set new_oifs;
if_set old_oifs;
if_set new_leaves;
mrtentry_ptr = find_route(&sockaddr6_any, group, MRTF_WC, DONT_CREATE);
if (mrtentry_ptr == (mrtentry_t *) NULL)
return;
if (!IF_ISSET(vifi, &mrtentry_ptr->leaves))
return; /* This interface wasn't leaf */
calc_oifs(mrtentry_ptr, &old_oifs);
IF_COPY(&mrtentry_ptr->leaves, &new_leaves);
IF_CLR(vifi, &new_leaves);
change_interfaces(mrtentry_ptr,
mrtentry_ptr->incoming,
&mrtentry_ptr->joined_oifs,
&mrtentry_ptr->pruned_oifs,
&new_leaves,
&mrtentry_ptr->asserted_oifs, 0);
calc_oifs(mrtentry_ptr, &new_oifs);
if ((!IF_ISEMPTY(&old_oifs)) && IF_ISEMPTY(&new_oifs))
{
/* The result oifs have changed from non-NULL to NULL */
FIRE_TIMER(mrtentry_ptr->jp_timer); /* Timeout the Join/Prune
* timer */
/*
* TODO: explicitly call the function?
* send_pim6_join_prune(mrtentry_ptr->upstream->vifi,
* mrtentry_ptr->upstream, pim_join_prune_holdtime);
*/
}
/*
* Check all (S,G) entries and clear the inherited "leaf" flag. TODO:
* XXX: This won't work for IGMPv3, because there we don't know whether
* the (S,G) leaf oif was inherited from the (*,G) entry or was created
* by source specific IGMP join.
*/
for (mrtentry_srcs = mrtentry_ptr->group->mrtlink;
mrtentry_srcs != (mrtentry_t *) NULL;
mrtentry_srcs = mrtentry_srcs->grpnext)
{
IF_COPY(&mrtentry_srcs->leaves, &new_leaves);
IF_CLR(vifi, &new_leaves);
change_interfaces(mrtentry_srcs,
mrtentry_srcs->incoming,
&mrtentry_srcs->joined_oifs,
&mrtentry_srcs->pruned_oifs,
&new_leaves,
&mrtentry_srcs->asserted_oifs, 0);
}
}
void
calc_oifs(mrtentry_ptr, oifs_ptr)
mrtentry_t *mrtentry_ptr;
if_set *oifs_ptr;
{
if_set oifs;
mrtentry_t *grp_route;
mrtentry_t *rp_route;
/*
* oifs = (((copied_outgoing + my_join) - my_prune) + my_leaves) -
* my_asserted_oifs - incoming_interface, i.e. `leaves` have higher
* priority than `prunes`, but lower priority than `asserted`. The
* incoming interface is always deleted from the oifs
*/
if (mrtentry_ptr == (mrtentry_t *) NULL)
{
IF_ZERO(oifs_ptr);
return;
}
IF_ZERO(&oifs);
if (!(mrtentry_ptr->flags & MRTF_PMBR))
{
/* Either (*,G) or (S,G). Merge with the oifs from the (*,*,RP) */
if ((rp_route =
mrtentry_ptr->group->active_rp_grp->rp->rpentry->mrtlink)
!= (mrtentry_t *) NULL)
{
IF_MERGE(&oifs, &rp_route->joined_oifs, &oifs);
IF_CLR_MASK(&oifs, &rp_route->pruned_oifs);
IF_MERGE(&oifs, &rp_route->leaves, &oifs);
IF_CLR_MASK(&oifs, &rp_route->asserted_oifs);
}
}
if (mrtentry_ptr->flags & MRTF_SG)
{
/* (S,G) entry. Merge with the oifs from (*,G) */
if ((grp_route = mrtentry_ptr->group->grp_route)
!= (mrtentry_t *) NULL)
{
IF_MERGE(&oifs, &grp_route->joined_oifs, &oifs);
IF_CLR_MASK(&oifs, &grp_route->pruned_oifs);
IF_MERGE(&oifs, &grp_route->leaves, &oifs);
IF_CLR_MASK(&oifs, &grp_route->asserted_oifs);
}
}
/* Calculate my own stuff */
IF_MERGE(&oifs, &mrtentry_ptr->joined_oifs, &oifs);
IF_CLR_MASK(&oifs, &mrtentry_ptr->pruned_oifs);
IF_MERGE(&oifs, &mrtentry_ptr->leaves, &oifs);
IF_CLR_MASK(&oifs, &mrtentry_ptr->asserted_oifs);
IF_CLR(mrtentry_ptr->incoming, &oifs);
IF_COPY(&oifs, oifs_ptr);
}
/*
* Set the iif, join/prune/leaves/asserted interfaces. Calculate and set the
* oifs. Return 1 if oifs change from NULL to not-NULL. Return -1 if oifs
* change from non-NULL to NULL else return 0 If the iif change or if the
* oifs change from NULL to non-NULL or vice-versa, then schedule that
* mrtentry join/prune timer to timeout immediately.
*/
int
change_interfaces(mrtentry_ptr, new_iif, new_joined_oifs_, new_pruned_oifs,
new_leaves_, new_asserted_oifs, flags)
mrtentry_t *mrtentry_ptr;
vifi_t new_iif;
if_set *new_joined_oifs_;
if_set *new_pruned_oifs;
if_set *new_leaves_;
if_set *new_asserted_oifs;
u_int16 flags;
{
if_set new_joined_oifs; /* The oifs for that particular
* mrtentry */
if_set old_joined_oifs;
if_set old_pruned_oifs;
if_set old_leaves;
if_set new_leaves;
if_set old_asserted_oifs;
if_set new_real_oifs; /* The result oifs */
if_set old_real_oifs;
vifi_t old_iif;
rpentry_t *rpentry_ptr;
cand_rp_t *cand_rp_ptr;
kernel_cache_t *kernel_cache_ptr;
rp_grp_entry_t *rp_grp_entry_ptr;
grpentry_t *grpentry_ptr;
mrtentry_t *mrtentry_srcs;
mrtentry_t *mrtentry_wc;
mrtentry_t *mrtentry_rp;
int delete_mrtentry_flag;
int return_value;
int fire_timer_flag;
if (mrtentry_ptr == (mrtentry_t *) NULL)
return (0);
IF_COPY(new_joined_oifs_, &new_joined_oifs);
IF_COPY(new_leaves_, &new_leaves);
old_iif = mrtentry_ptr->incoming;
IF_COPY(&mrtentry_ptr->joined_oifs, &old_joined_oifs);
IF_COPY(&mrtentry_ptr->leaves, &old_leaves);
IF_COPY(&mrtentry_ptr->pruned_oifs, &old_pruned_oifs);
IF_COPY(&mrtentry_ptr->asserted_oifs, &old_asserted_oifs);
IF_COPY(&mrtentry_ptr->oifs, &old_real_oifs);
mrtentry_ptr->incoming = new_iif;
IF_COPY(&new_joined_oifs, &mrtentry_ptr->joined_oifs);
IF_COPY(new_pruned_oifs, &mrtentry_ptr->pruned_oifs);
IF_COPY(&new_leaves, &mrtentry_ptr->leaves);
IF_COPY(new_asserted_oifs, &mrtentry_ptr->asserted_oifs);
calc_oifs(mrtentry_ptr, &new_real_oifs);
if (IF_ISEMPTY(&old_real_oifs))
{
if (IF_ISEMPTY(&new_real_oifs))
return_value = 0;
else
return_value = 1;
}
else
{
if (IF_ISEMPTY(&new_real_oifs))
return_value = -1;
else
return_value = 0;
}
if ((IF_SAME(&new_real_oifs, &old_real_oifs))
&& (new_iif == old_iif)
&& !(flags & MFC_UPDATE_FORCE))
return 0; /* Nothing to change */
if ((return_value != 0) || (new_iif != old_iif)
|| (flags & MFC_UPDATE_FORCE))
FIRE_TIMER(mrtentry_ptr->jp_timer);
IF_COPY(&new_real_oifs, &mrtentry_ptr->oifs);
if (mrtentry_ptr->flags & MRTF_PMBR)
{
/* (*,*,RP) entry */
rpentry_ptr = mrtentry_ptr->source;
if (rpentry_ptr == (rpentry_t *) NULL)
return (0); /* Shoudn't happen */
rpentry_ptr->incoming = new_iif;
cand_rp_ptr = rpentry_ptr->cand_rp;
if (IF_ISEMPTY(&new_real_oifs))
{
delete_mrtentry_flag = TRUE;
}
else
{
delete_mrtentry_flag = FALSE;
#ifdef RSRR
rsrr_cache_send(mrtentry_ptr, RSRR_NOTIFICATION_OK);
#endif /* RSRR */
}
if (mrtentry_ptr->flags & MRTF_KERNEL_CACHE)
{
/* Update the kernel MFC entries */
if (delete_mrtentry_flag == TRUE)
/*
* XXX: no need to send RSRR message. Will do it when delete
* the mrtentry.
*/
for (kernel_cache_ptr = mrtentry_ptr->kernel_cache;
kernel_cache_ptr != (kernel_cache_t *) NULL;
kernel_cache_ptr = kernel_cache_ptr->next)
delete_mrtentry_all_kernel_cache(mrtentry_ptr);
else
{
for (kernel_cache_ptr = mrtentry_ptr->kernel_cache;
kernel_cache_ptr != (kernel_cache_t *) NULL;
kernel_cache_ptr = kernel_cache_ptr->next)
/* here mrtentry_ptr->source->address is the RP address */
k_chg_mfc(mld6_socket, &kernel_cache_ptr->source,
&kernel_cache_ptr->group, new_iif,
&new_real_oifs, &mrtentry_ptr->source->address);
}
}
/*
* Update all (*,G) entries associated with this RP. The particular
* (*,G) outgoing are not changed, but the change in the (*,*,RP)
* oifs may have affect the real oifs.
*/
fire_timer_flag = FALSE;
for (rp_grp_entry_ptr = cand_rp_ptr->rp_grp_next;
rp_grp_entry_ptr != (rp_grp_entry_t *) NULL;
rp_grp_entry_ptr = rp_grp_entry_ptr->rp_grp_next)
{
for (grpentry_ptr = rp_grp_entry_ptr->grplink;
grpentry_ptr != (grpentry_t *) NULL;
grpentry_ptr = grpentry_ptr->rpnext)
{
if (grpentry_ptr->grp_route != (mrtentry_t *) NULL)
{
if (change_interfaces(grpentry_ptr->grp_route, new_iif,
&grpentry_ptr->grp_route->joined_oifs,
&grpentry_ptr->grp_route->pruned_oifs,
&grpentry_ptr->grp_route->leaves,
&grpentry_ptr->grp_route->asserted_oifs,
flags))
fire_timer_flag = TRUE;
}
else
{
/* Change all (S,G) entries if no (*,G) */
for (mrtentry_srcs = grpentry_ptr->mrtlink;
mrtentry_srcs != (mrtentry_t *) NULL;
mrtentry_srcs = mrtentry_srcs->grpnext)
{
if (mrtentry_srcs->flags & MRTF_RP)
{
if (change_interfaces(mrtentry_srcs, new_iif,
&mrtentry_srcs->joined_oifs,
&mrtentry_srcs->pruned_oifs,
&mrtentry_srcs->leaves,
&mrtentry_srcs->asserted_oifs,
flags))
fire_timer_flag = TRUE;
}
else
{
if (change_interfaces(mrtentry_srcs,
mrtentry_srcs->incoming,
&mrtentry_srcs->joined_oifs,
&mrtentry_srcs->pruned_oifs,
&mrtentry_srcs->leaves,
&mrtentry_srcs->asserted_oifs,
flags))
fire_timer_flag = TRUE;
}
}
}
}
}
if (fire_timer_flag == TRUE)
FIRE_TIMER(mrtentry_ptr->jp_timer);
if (delete_mrtentry_flag == TRUE)
{
/*
* TODO: XXX: trigger a Prune message? Don't delete now, it will
* be automatically timed out. If want to delete now, don't
* reference to it anymore! delete_mrtentry(mrtentry_ptr);
*/
}
return (return_value); /* (*,*,RP) */
}
if (mrtentry_ptr->flags & MRTF_WC)
{
/* (*,G) entry */
if (IF_ISEMPTY(&new_real_oifs))
delete_mrtentry_flag = TRUE;
else
{
delete_mrtentry_flag = FALSE;
#ifdef RSRR
rsrr_cache_send(mrtentry_ptr, RSRR_NOTIFICATION_OK);
#endif /* RSRR */
}
if (mrtentry_ptr->flags & MRTF_KERNEL_CACHE)
{
if (delete_mrtentry_flag == TRUE)
delete_mrtentry_all_kernel_cache(mrtentry_ptr);
else
{
for (kernel_cache_ptr = mrtentry_ptr->kernel_cache;
kernel_cache_ptr != (kernel_cache_t *) NULL;
kernel_cache_ptr = kernel_cache_ptr->next)
k_chg_mfc(mld6_socket, &kernel_cache_ptr->source,
&kernel_cache_ptr->group, new_iif,
&new_real_oifs, &mrtentry_ptr->group->rpaddr);
}
}
/*
* Update all (S,G) entries for this group. For the (S,G)RPbit
* entries the iif is the iif toward the RP; The particular (S,G)
* oifs are not changed, but the change in the (*,G) oifs may affect
* the real oifs.
*/
fire_timer_flag = FALSE;
for (mrtentry_srcs = mrtentry_ptr->group->mrtlink;
mrtentry_srcs != (mrtentry_t *) NULL;
mrtentry_srcs = mrtentry_srcs->grpnext)
{
if (mrtentry_srcs->flags & MRTF_RP)
{
if (change_interfaces(mrtentry_srcs, new_iif,
&mrtentry_srcs->joined_oifs,
&mrtentry_srcs->pruned_oifs,
&mrtentry_srcs->leaves,
&mrtentry_srcs->asserted_oifs, flags))
fire_timer_flag = TRUE;
}
else
{
if (change_interfaces(mrtentry_srcs, mrtentry_srcs->incoming,
&mrtentry_srcs->joined_oifs,
&mrtentry_srcs->pruned_oifs,
&mrtentry_srcs->leaves,
&mrtentry_srcs->asserted_oifs, flags))
fire_timer_flag = TRUE;
}
}
if (fire_timer_flag == TRUE)
FIRE_TIMER(mrtentry_ptr->jp_timer);
if (delete_mrtentry_flag == TRUE)
{
/* TODO: XXX: the oifs are NULL. Send a Prune message? */
}
return (return_value); /* (*,G) */
}
if (mrtentry_ptr->flags & MRTF_SG)
{
/* (S,G) entry */
#ifdef KERNEL_MFC_WC_G
if_set tmp_oifs;
mrtentry_t *mrtentry_tmp;
#endif /* KERNEL_MFC_WC_G */
mrtentry_rp = mrtentry_ptr->group->active_rp_grp->rp->rpentry->mrtlink;
mrtentry_wc = mrtentry_ptr->group->grp_route;
#ifdef KERNEL_MFC_WC_G
/*
* Check whether (*,*,RP) or (*,G) have different (iif,oifs) from the
* (S,G). If "yes", then forbid creating (*,G) MFC.
*/
for (mrtentry_tmp = mrtentry_rp; 1; mrtentry_tmp = mrtentry_wc)
{
for (; 1;)
{
if (mrtentry_tmp == (mrtentry_t *) NULL)
break;
if (mrtentry_tmp->flags & MRTF_MFC_CLONE_SG)
break;
if (mrtentry_tmp->incoming != mrtentry_ptr->incoming)
{
delete_single_kernel_cache_addr(mrtentry_tmp, IN6ADDR_ANY_N,
mrtentry_ptr->group->group);
mrtentry_tmp->flags |= MRTF_MFC_CLONE_SG;
break;
}
calc_oifs(mrtentry_tmp, &tmp_oifs);
if (!(IF_SAME(&new_real_oifs, &tmp_oifs)))
mrtentry_tmp->flags |= MRTF_MFC_CLONE_SG;
break;
}
if (mrtentry_tmp == mrtentry_wc)
break;
}
#endif /* KERNEL_MFC_WC_G */
if (IF_ISEMPTY(&new_real_oifs))
delete_mrtentry_flag = TRUE;
else
{
delete_mrtentry_flag = FALSE;
#ifdef RSRR
rsrr_cache_send(mrtentry_ptr, RSRR_NOTIFICATION_OK);
#endif /* RSRR */
}
if (mrtentry_ptr->flags & MRTF_KERNEL_CACHE)
{
if (delete_mrtentry_flag == TRUE)
delete_mrtentry_all_kernel_cache(mrtentry_ptr);
else
{
k_chg_mfc(mld6_socket, &mrtentry_ptr->source->address,
&mrtentry_ptr->group->group, new_iif, &new_real_oifs,
&mrtentry_ptr->group->rpaddr);
}
}
if (old_iif != new_iif)
{
if (new_iif == mrtentry_ptr->source->incoming)
{
/*
* For example, if this was (S,G)RPbit with iif toward the
* RP, and now switch to the Shortest Path. The setup of
* MRTF_SPT flag must be done by the external calling
* function (triggered only by receiving of a data from the
* source.)
*/
mrtentry_ptr->flags &= ~MRTF_RP;
/*
* TODO: XXX: delete? Check again where will be the best
* place to set it. mrtentry_ptr->flags |= MRTF_SPT;
*/
}
if (((mrtentry_wc != (mrtentry_t *) NULL)
&& (mrtentry_wc->incoming == new_iif))
|| ((mrtentry_rp != (mrtentry_t *) NULL)
&& (mrtentry_rp->incoming == new_iif)))
{
/*
* If the new iif points toward the RP, reset the SPT flag.
* (PIM-SM-spec-10.ps pp. 11, 2.10, last sentence of first
* paragraph.
*/
/* TODO: XXX: check again! */
mrtentry_ptr->flags &= ~MRTF_SPT;
mrtentry_ptr->flags |= MRTF_RP;
}
}
/*
* TODO: XXX: if this is (S,G)RPbit entry and the oifs==(*,G)oifs,
* then delete the (S,G) entry?? The same if we have (*,*,RP) ?
*/
if (delete_mrtentry_flag == TRUE)
{
/* TODO: XXX: the oifs are NULL. Send a Prune message ? */
}
/* TODO: XXX: have the feeling something is missing.... */
return (return_value); /* (S,G) */
}
return (return_value);
}
/*
* TODO: implement it. Required to allow changing of the physical interfaces
* configuration without need to restart pimd.
*/
int
delete_vif_from_mrt(vifi)
vifi_t vifi;
{
return TRUE;
}
void
process_kernel_call()
{
register struct mrt6msg *im; /* igmpmsg control struct */
im = (struct mrt6msg *) mld6_recv_buf;
switch (im->im6_msgtype)
{
case MRT6MSG_NOCACHE:
process_cache_miss(im);
break;
case MRT6MSG_WRONGMIF:
process_wrong_iif(im);
break;
case MRT6MSG_WHOLEPKT:
process_whole_pkt(mld6_recv_buf);
break;
default:
IF_DEBUG(DEBUG_KERN)
log(LOG_DEBUG, 0, "Unknown kernel_call code");
break;
}
}
/*
* TODO: when cache miss, check the iif, because probably ASSERTS shoult take
* place
*/
static void
process_cache_miss(im)
struct mrt6msg *im;
{
static struct sockaddr_in6 source = {sizeof(source) , AF_INET6 };
static struct sockaddr_in6 mfc_source = {sizeof(source) , AF_INET6 };
static struct sockaddr_in6 group = {sizeof(group) , AF_INET6 };
static struct sockaddr_in6 rp_addr = {sizeof(source) , AF_INET6 };
vifi_t iif;
mrtentry_t *mrtentry_ptr;
mrtentry_t *mrtentry_rp;
/*
* When there is a cache miss, we check only the header of the packet
* (and only it should be sent up by the kernel.)
*/
group.sin6_addr = im->im6_dst;
group.sin6_scope_id = inet6_uvif2scopeid(&group, &uvifs[im->im6_mif]);
source.sin6_addr = mfc_source.sin6_addr = im->im6_src;
source.sin6_scope_id = inet6_uvif2scopeid(&source, &uvifs[im->im6_mif]);
iif = im->im6_mif;
uvifs[iif].uv_cache_miss++;
IF_DEBUG(DEBUG_MFC)
log(LOG_DEBUG, 0, "Cache miss, src %s, dst %s, iif %d",
inet6_fmt(&source.sin6_addr), inet6_fmt(&group.sin6_addr), iif);
/*
* TODO: XXX: check whether the kernel generates cache miss for the LAN
* scoped addresses
*/
/* Don't create routing entries for the LAN scoped addresses */
if (IN6_IS_ADDR_MC_NODELOCAL(&group.sin6_addr) ||/* sanity? */
IN6_IS_ADDR_MC_LINKLOCAL(&group.sin6_addr))
goto fail;
/* TODO: check if correct in case the source is one of my addresses */
/*
* If I am the DR for this source, create (S,G) and add the register_vif
* to the oifs.
*/
if ((uvifs[iif].uv_flags & VIFF_DR)
&& (find_vif_direct_local(&source) == iif))
{
mrtentry_ptr = find_route(&source, &group, MRTF_SG, CREATE);
if (mrtentry_ptr == (mrtentry_t *) NULL)
{
goto fail;
}
mrtentry_ptr->flags &= ~MRTF_NEW;
/* set reg_vif_num as outgoing interface ONLY if I am not the RP */
if (!inet6_equal(&mrtentry_ptr->group->rpaddr, &my_cand_rp_address))
IF_SET(reg_vif_num, &mrtentry_ptr->joined_oifs);
change_interfaces(mrtentry_ptr,
mrtentry_ptr->incoming,
&mrtentry_ptr->joined_oifs,
&mrtentry_ptr->pruned_oifs,
&mrtentry_ptr->leaves,
&mrtentry_ptr->asserted_oifs, 0);
}
else
{
mrtentry_ptr = find_route(&source, &group,
MRTF_SG | MRTF_WC | MRTF_PMBR,
DONT_CREATE);
if (mrtentry_ptr == (mrtentry_t *) NULL)
goto fail;
}
/*
* TODO: if there are too many cache miss for the same (S,G), install
* negative cache entry in the kernel (oif==NULL) to prevent too many
* upcalls.
*/
if (mrtentry_ptr->incoming == iif)
{
if (!IF_ISEMPTY(&mrtentry_ptr->oifs))
{
if (mrtentry_ptr->flags & MRTF_SG)
{
/* TODO: check that the RPbit is not set? */
/* TODO: XXX: TIMER implem. dependency! */
if (mrtentry_ptr->timer < pim_data_timeout)
SET_TIMER(mrtentry_ptr->timer, pim_data_timeout);
if (!(mrtentry_ptr->flags & MRTF_SPT))
{
if ((mrtentry_rp = mrtentry_ptr->group->grp_route) ==
(mrtentry_t *) NULL)
mrtentry_rp = mrtentry_ptr->group->active_rp_grp->rp->rpentry->mrtlink;
if (mrtentry_rp != (mrtentry_t *) NULL)
{
/*
* Check if the (S,G) iif is different from the (*,G)
* or (*,*,RP) iif
*/
if ((mrtentry_ptr->incoming != mrtentry_rp->incoming)
|| (mrtentry_ptr->upstream != mrtentry_rp->upstream))
{
mrtentry_ptr->flags |= MRTF_SPT;
mrtentry_ptr->flags &= ~MRTF_RP;
}
}
}
}
if (mrtentry_ptr->flags & MRTF_PMBR)
rp_addr = mrtentry_ptr->source->address;
else
rp_addr = mrtentry_ptr->group->rpaddr;
mfc_source = source;
#ifdef KERNEL_MFC_WC_G
// TODO
if (mrtentry_ptr->flags & (MRTF_WC | MRTF_PMBR))
if (!(mrtentry_ptr->flags & MRTF_MFC_CLONE_SG))
mfc_source = IN6ADDR_ANY_N;
#endif /* KERNEL_MFC_WC_G */
add_kernel_cache(mrtentry_ptr, &mfc_source, &group, MFC_MOVE_FORCE);
k_chg_mfc(mld6_socket, &mfc_source, &group, iif, &mrtentry_ptr->oifs,
&rp_addr);
/*
* TODO: XXX: No need for RSRR message, because nothing has
* changed.
*/
}
return; /* iif match */
}
/* The iif doesn't match */
if (mrtentry_ptr->flags & MRTF_SG)
{
if (mrtentry_ptr->flags & MRTF_SPT)
/* Arrived on wrong interface */
goto fail;
if ((mrtentry_rp = mrtentry_ptr->group->grp_route) ==
(mrtentry_t *) NULL)
mrtentry_rp =
mrtentry_ptr->group->active_rp_grp->rp->rpentry->mrtlink;
if (mrtentry_rp != (mrtentry_t *) NULL)
{
if (mrtentry_rp->incoming == iif)
{
/* Forward on (*,G) or (*,*,RP) */
#ifdef KERNEL_MFC_WC_G
if (!(mrtentry_rp->flags & MRTF_MFC_CLONE_SG))
mfc_source = IN6ADDR_ANY_N;
#endif /* KERNEL_MFC_WC_G */
add_kernel_cache(mrtentry_rp, &mfc_source, &group, 0);
k_chg_mfc(mld6_socket, &mfc_source, &group, iif,
&mrtentry_rp->oifs, &mrtentry_ptr->group->rpaddr);
#ifdef RSRR
rsrr_cache_send(mrtentry_rp, RSRR_NOTIFICATION_OK);
#endif /* RSRR */
return;
}
}
goto fail;
}
fail:
uvifs[iif].uv_cache_notcreated++;
}
/*
* A multicast packet has been received on wrong iif by the kernel. Check for
* a matching entry. If there is (S,G) with reset SPTbit and the packet was
* received on the iif toward the source, this completes the switch to the
* shortest path and triggers (S,G) prune toward the RP (unless I am the RP).
* Otherwise, if the packet's iif is in the oiflist of the routing entry,
* trigger an Assert.
*/
static void
process_wrong_iif(im)
struct mrt6msg *im;
{
static struct sockaddr_in6 source= {sizeof(source) , AF_INET6};
static struct sockaddr_in6 group = {sizeof(group) , AF_INET6};
vifi_t iif;
mrtentry_t *mrtentry_ptr;
group.sin6_addr = im->im6_dst;
source.sin6_addr = im->im6_src;
iif = im->im6_mif;
/* Don't create routing entries for the LAN scoped addresses */
if (IN6_IS_ADDR_MC_NODELOCAL(&group.sin6_addr) ||/* sanity? */
IN6_IS_ADDR_MC_LINKLOCAL(&group.sin6_addr))
return;
/*
* Ignore if it comes on register vif. register vif is neither SPT iif,
* neither is used to send asserts out.
*/
if (uvifs[iif].uv_flags & MIFF_REGISTER)
return;
mrtentry_ptr = find_route(&source, &group, MRTF_SG | MRTF_WC | MRTF_PMBR,
DONT_CREATE);
if (mrtentry_ptr == (mrtentry_t *)NULL)
return;
/*
* TODO: check again!
*/
if (mrtentry_ptr->flags & MRTF_SG)
{
if (!(mrtentry_ptr->flags & MRTF_SPT))
{
if (mrtentry_ptr->source->incoming == iif)
{
/* Switch to the Shortest Path */
mrtentry_ptr->flags |= MRTF_SPT;
mrtentry_ptr->flags &= ~MRTF_RP;
add_kernel_cache(mrtentry_ptr, &source, &group, MFC_MOVE_FORCE);
k_chg_mfc(mld6_socket, &source, &group, iif,
&mrtentry_ptr->oifs, &mrtentry_ptr->group->rpaddr);
FIRE_TIMER(mrtentry_ptr->jp_timer);
#ifdef RSRR
rsrr_cache_send(mrtentry_ptr, RSRR_NOTIFICATION_OK);
#endif /* RSRR */
return;
}
}
}
/* Trigger an Assert */
if (IF_ISSET(iif, &mrtentry_ptr->oifs))
send_pim6_assert(&source, &group, iif, mrtentry_ptr);
}
/*
* Receives whole packets from the register vif entries in the kernel, and
* calls the send_pim_register procedure to encapsulate the packets and
* unicasts them to the RP.
*/
static void
process_whole_pkt(buf)
char *buf;
{
send_pim6_register((char *) (buf + sizeof(struct mrt6msg)));
}
mrtentry_t *
switch_shortest_path(source, group)
struct sockaddr_in6 *source;
struct sockaddr_in6 *group;
{
mrtentry_t *mrtentry_ptr;
/* TODO: XXX: prepare and send immediately the (S,G) join? */
if ((mrtentry_ptr = find_route(source, group, MRTF_SG, CREATE)) !=
(mrtentry_t *) NULL)
{
if (mrtentry_ptr->flags & MRTF_NEW)
{
mrtentry_ptr->flags &= ~MRTF_NEW;
}
else
{
if (mrtentry_ptr->flags & MRTF_RP)
{
/*
* (S,G)RPbit with iif toward RP. Reset to (S,G) with iif
* toward S. Delete the kernel cache (if any), because
* change_interfaces() will reset it with iif toward S and no
* data will arrive from RP before the switch really occurs.
*/
mrtentry_ptr->flags &= ~MRTF_RP;
mrtentry_ptr->incoming = mrtentry_ptr->source->incoming;
mrtentry_ptr->upstream = mrtentry_ptr->source->upstream;
delete_mrtentry_all_kernel_cache(mrtentry_ptr);
change_interfaces(mrtentry_ptr,
mrtentry_ptr->incoming,
&mrtentry_ptr->joined_oifs,
&mrtentry_ptr->pruned_oifs,
&mrtentry_ptr->leaves,
&mrtentry_ptr->asserted_oifs, 0);
}
}
SET_TIMER(mrtentry_ptr->timer, pim_data_timeout);
FIRE_TIMER(mrtentry_ptr->jp_timer);
}
return (mrtentry_ptr);
}
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