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NetBSD/usr.sbin/pim6sd/mrt.c

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/* $NetBSD: mrt.c,v 1.3 2000/05/19 10:43:49 itojun 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 <syslog.h>
#include <stdlib.h>
#include <string.h>
#include "mrt.h"
#include "vif.h"
#include "rp.h"
#include "pimd.h"
#include "debug.h"
#include "mld6.h"
#include "inet6.h"
#include "timer.h"
#include "route.h"
#include "kern.h"
srcentry_t *srclist;
grpentry_t *grplist;
/*
* Local functions definition
*/
static srcentry_t *create_srcentry __P((struct sockaddr_in6 *source));
static int search_srclist __P((struct sockaddr_in6 *source ,
srcentry_t ** sourceEntry));
static int search_srcmrtlink __P((srcentry_t * srcentry_ptr,
struct sockaddr_in6 *group,
mrtentry_t ** mrtPtr));
static void insert_srcmrtlink __P((mrtentry_t * elementPtr,
mrtentry_t * insertPtr,
srcentry_t * srcListPtr));
static grpentry_t *create_grpentry __P((struct sockaddr_in6 *group));
static int search_grplist __P((struct sockaddr_in6 *group,
grpentry_t ** groupEntry));
static int search_grpmrtlink __P((grpentry_t * grpentry_ptr,
struct sockaddr_in6 *source,
mrtentry_t ** mrtPtr));
static void insert_grpmrtlink __P((mrtentry_t * elementPtr,
mrtentry_t * insertPtr,
grpentry_t * grpListPtr));
static mrtentry_t *alloc_mrtentry __P((srcentry_t * srcentry_ptr,
grpentry_t * grpentry_ptr));
static mrtentry_t *create_mrtentry __P((srcentry_t * srcentry_ptr,
grpentry_t * grpentry_ptr,
u_int16 flags));
static void move_kernel_cache __P((mrtentry_t * mrtentry_ptr,
u_int16 flags));
void
init_pim6_mrt()
{
/* TODO: delete any existing routing table */
/* Initialize the source list */
/* The first entry has address 'IN6ADDR_ANY' and is not used */
/* The order is the smallest address first. */
srclist = (srcentry_t *) malloc(sizeof(srcentry_t));
srclist->next = (srcentry_t *) NULL;
srclist->prev = (srcentry_t *) NULL;
memset(&srclist->address, 0, sizeof(struct sockaddr_in6));
srclist->address.sin6_len = sizeof(struct sockaddr_in6);
srclist->address.sin6_family = AF_INET6;
srclist->mrtlink = (mrtentry_t *) NULL;
srclist->incoming = NO_VIF;
srclist->upstream = (pim_nbr_entry_t *) NULL;
srclist->metric = 0;
srclist->preference = 0;
RESET_TIMER(srclist->timer);
srclist->cand_rp = (cand_rp_t *) NULL;
/* Initialize the group list */
/* The first entry has address 'IN6ADDR_ANY' and is not used */
/* The order is the smallest address first. */
grplist = (grpentry_t *) malloc(sizeof(grpentry_t));
grplist->next = (grpentry_t *) NULL;
grplist->prev = (grpentry_t *) NULL;
grplist->rpnext = (grpentry_t *) NULL;
grplist->rpprev = (grpentry_t *) NULL;
memset(&grplist->group, 0, sizeof(struct sockaddr_in6));
grplist->group.sin6_len = sizeof(struct sockaddr_in6);
grplist->group.sin6_family = AF_INET6;
memset(&grplist->rpaddr, 0, sizeof(struct sockaddr_in6));
grplist->rpaddr.sin6_len = sizeof(struct sockaddr_in6);
grplist->rpaddr.sin6_family = AF_INET6;
grplist->mrtlink = (mrtentry_t *) NULL;
grplist->active_rp_grp = (rp_grp_entry_t *) NULL;
grplist->grp_route = (mrtentry_t *) NULL;
}
grpentry_t *
find_group(group)
struct sockaddr_in6 *group;
{
grpentry_t *grpentry_ptr;
if (!IN6_IS_ADDR_MULTICAST(&group->sin6_addr))
return (grpentry_t *) NULL;
if (search_grplist(group, &grpentry_ptr) == TRUE)
{
/* Group found! */
return (grpentry_ptr);
}
return (grpentry_t *) NULL;
}
srcentry_t *
find_source(source)
struct sockaddr_in6 *source;
{
srcentry_t *srcentry_ptr;
if (!inet6_valid_host(source))
return (srcentry_t *) NULL;
if (search_srclist(source, &srcentry_ptr) == TRUE)
{
/* Source found! */
return (srcentry_ptr);
}
return (srcentry_t *) NULL;
}
mrtentry_t *
find_route(source, group, flags, create)
struct sockaddr_in6 *source,
*group;
u_int16 flags;
char create;
{
srcentry_t *srcentry_ptr;
grpentry_t *grpentry_ptr;
mrtentry_t *mrtentry_ptr;
mrtentry_t *mrtentry_ptr_wc;
mrtentry_t *mrtentry_ptr_pmbr;
mrtentry_t *mrtentry_ptr_2;
rpentry_t *rpentry_ptr=NULL;
rp_grp_entry_t *rp_grp_entry_ptr;
if (flags & (MRTF_SG | MRTF_WC))
{
if (!IN6_IS_ADDR_MULTICAST(&group->sin6_addr))
return (mrtentry_t *) NULL;
}
if (flags & MRTF_SG)
if (!inet6_valid_host(source))
return (mrtentry_t *) NULL;
if (create == DONT_CREATE)
{
if (flags & (MRTF_SG | MRTF_WC))
{
if (search_grplist(group, &grpentry_ptr) == FALSE)
{
/* Group not found. Return the (*,*,RP) entry */
if (flags & MRTF_PMBR)
{
rpentry_ptr = rp_match(group);
if (rpentry_ptr != (rpentry_t *) NULL)
return (rpentry_ptr->mrtlink);
}
return (mrtentry_t *) NULL;
}
/* Search for the source */
if (flags & MRTF_SG)
{
if (search_grpmrtlink(grpentry_ptr, source,
&mrtentry_ptr) == TRUE)
{
/* Exact (S,G) entry found */
return (mrtentry_ptr);
}
}
/* No (S,G) entry. Return the (*,G) entry (if exist) */
if ((flags & MRTF_WC) &&
(grpentry_ptr->grp_route != (mrtentry_t *) NULL))
return (grpentry_ptr->grp_route);
}
/* Return the (*,*,RP) entry */
if (flags & MRTF_PMBR)
{
rpentry_ptr = (rpentry_t *) NULL;
if (group != NULL)
rpentry_ptr = rp_match(group);
else
if (source != NULL)
rpentry_ptr = rp_find(source);
if (rpentry_ptr != (rpentry_t *) NULL)
return (rpentry_ptr->mrtlink);
}
return (mrtentry_t *) NULL;
}
/* Creation allowed */
if (flags & (MRTF_SG | MRTF_WC))
{
grpentry_ptr = create_grpentry(group);
if (grpentry_ptr == (grpentry_t *) NULL)
{
return (mrtentry_t *) NULL;
}
if (grpentry_ptr->active_rp_grp == (rp_grp_entry_t *) NULL)
{
rp_grp_entry_ptr = rp_grp_match(group);
if (rp_grp_entry_ptr == (rp_grp_entry_t *) NULL)
{
if ((grpentry_ptr->mrtlink == (mrtentry_t *) NULL)
&& (grpentry_ptr->grp_route == (mrtentry_t *) NULL))
{
/* New created grpentry. Delete it. */
delete_grpentry(grpentry_ptr);
}
return (mrtentry_t *) NULL;
}
rpentry_ptr = rp_grp_entry_ptr->rp->rpentry;
grpentry_ptr->active_rp_grp = rp_grp_entry_ptr;
grpentry_ptr->rpaddr = rpentry_ptr->address;
/* Link to the top of the rp_grp_chain */
grpentry_ptr->rpnext = rp_grp_entry_ptr->grplink;
rp_grp_entry_ptr->grplink = grpentry_ptr;
if (grpentry_ptr->rpnext != (grpentry_t *) NULL)
grpentry_ptr->rpnext->rpprev = grpentry_ptr;
}
else
rpentry_ptr = grpentry_ptr->active_rp_grp->rp->rpentry;
}
mrtentry_ptr_wc = mrtentry_ptr_pmbr = (mrtentry_t *) NULL;
if (flags & MRTF_WC)
{
/* Setup the (*,G) routing entry */
mrtentry_ptr_wc = create_mrtentry((srcentry_t *) NULL, grpentry_ptr,
MRTF_WC);
if (mrtentry_ptr_wc == (mrtentry_t *) NULL)
{
if (grpentry_ptr->mrtlink == (mrtentry_t *) NULL)
{
/* New created grpentry. Delete it. */
delete_grpentry(grpentry_ptr);
}
return (mrtentry_t *) NULL;
}
if (mrtentry_ptr_wc->flags & MRTF_NEW)
{
mrtentry_ptr_pmbr = rpentry_ptr->mrtlink;
/* Copy the oif list from the (*,*,RP) entry */
if (mrtentry_ptr_pmbr != (mrtentry_t *) NULL)
{
VOIF_COPY(mrtentry_ptr_pmbr, mrtentry_ptr_wc);
}
mrtentry_ptr_wc->incoming = rpentry_ptr->incoming;
mrtentry_ptr_wc->upstream = rpentry_ptr->upstream;
mrtentry_ptr_wc->metric = rpentry_ptr->metric;
mrtentry_ptr_wc->preference = rpentry_ptr->preference;
move_kernel_cache(mrtentry_ptr_wc, 0);
#ifdef RSRR
rsrr_cache_bring_up(mrtentry_ptr_wc);
#endif /* RSRR */
}
if (!(flags & MRTF_SG))
{
return (mrtentry_ptr_wc);
}
}
if (flags & MRTF_SG)
{
/* Setup the (S,G) routing entry */
srcentry_ptr = create_srcentry(source);
if (srcentry_ptr == (srcentry_t *) NULL)
{
/* TODO: XXX: The MRTF_NEW flag check may be misleading?? check */
if (((grpentry_ptr->grp_route == (mrtentry_t *) NULL)
|| ((grpentry_ptr->grp_route != (mrtentry_t *) NULL)
&& (grpentry_ptr->grp_route->flags & MRTF_NEW)))
&& (grpentry_ptr->mrtlink == (mrtentry_t *) NULL))
{
/* New created grpentry. Delete it. */
delete_grpentry(grpentry_ptr);
}
return (mrtentry_t *) NULL;
}
mrtentry_ptr = create_mrtentry(srcentry_ptr, grpentry_ptr, MRTF_SG);
if (mrtentry_ptr == (mrtentry_t *) NULL)
{
if (((grpentry_ptr->grp_route == (mrtentry_t *) NULL)
|| ((grpentry_ptr->grp_route != (mrtentry_t *) NULL)
&& (grpentry_ptr->grp_route->flags & MRTF_NEW)))
&& (grpentry_ptr->mrtlink == (mrtentry_t *) NULL))
{
/* New created grpentry. Delete it. */
delete_grpentry(grpentry_ptr);
}
if (srcentry_ptr->mrtlink == (mrtentry_t *) NULL)
{
/* New created srcentry. Delete it. */
delete_srcentry(srcentry_ptr);
}
return (mrtentry_t *) NULL;
}
if (mrtentry_ptr->flags & MRTF_NEW)
{
if ((mrtentry_ptr_2 = grpentry_ptr->grp_route)
== (mrtentry_t *) NULL)
{
mrtentry_ptr_2 = rpentry_ptr->mrtlink;
}
/* Copy the oif list from the existing (*,G) or (*,*,RP) entry */
if (mrtentry_ptr_2 != (mrtentry_t *) NULL)
{
VOIF_COPY(mrtentry_ptr_2, mrtentry_ptr);
if (flags & MRTF_RP)
{
/* ~(S,G) prune entry */
mrtentry_ptr->incoming = mrtentry_ptr_2->incoming;
mrtentry_ptr->upstream = mrtentry_ptr_2->upstream;
mrtentry_ptr->metric = mrtentry_ptr_2->metric;
mrtentry_ptr->preference = mrtentry_ptr_2->preference;
mrtentry_ptr->flags |= MRTF_RP;
}
}
if (!(mrtentry_ptr->flags & MRTF_RP))
{
mrtentry_ptr->incoming = srcentry_ptr->incoming;
mrtentry_ptr->upstream = srcentry_ptr->upstream;
mrtentry_ptr->metric = srcentry_ptr->metric;
mrtentry_ptr->preference = srcentry_ptr->preference;
}
move_kernel_cache(mrtentry_ptr, 0);
#ifdef RSRR
rsrr_cache_bring_up(mrtentry_ptr);
#endif /* RSRR */
}
return (mrtentry_ptr);
}
if (flags & MRTF_PMBR)
{
/* Get/return the (*,*,RP) routing entry */
if (group != NULL)
rpentry_ptr = rp_match(group);
else
if (source != NULL)
{
rpentry_ptr = rp_find(source);
if (rpentry_ptr == (rpentry_t *) NULL)
{
return (mrtentry_t *) NULL;
}
}
else
return (mrtentry_t *) NULL; /* source == group ==
* IN6ADDR_ANY */
if (rpentry_ptr->mrtlink != (mrtentry_t *) NULL)
return (rpentry_ptr->mrtlink);
mrtentry_ptr = create_mrtentry(rpentry_ptr, (grpentry_t *) NULL,
MRTF_PMBR);
if (mrtentry_ptr == (mrtentry_t *) NULL)
return (mrtentry_t *) NULL;
mrtentry_ptr->incoming = rpentry_ptr->incoming;
mrtentry_ptr->upstream = rpentry_ptr->upstream;
mrtentry_ptr->metric = rpentry_ptr->metric;
mrtentry_ptr->preference = rpentry_ptr->preference;
return (mrtentry_ptr);
}
return (mrtentry_t *) NULL;
}
void
delete_srcentry(srcentry_ptr)
srcentry_t *srcentry_ptr;
{
mrtentry_t *mrtentry_ptr;
mrtentry_t *mrtentry_next;
if (srcentry_ptr == (srcentry_t *) NULL)
return;
/* TODO: XXX: the first entry is unused and always there */
srcentry_ptr->prev->next = srcentry_ptr->next;
if (srcentry_ptr->next != (srcentry_t *) NULL)
srcentry_ptr->next->prev = srcentry_ptr->prev;
for (mrtentry_ptr = srcentry_ptr->mrtlink;
mrtentry_ptr != (mrtentry_t *) NULL;
mrtentry_ptr = mrtentry_next)
{
mrtentry_next = mrtentry_ptr->srcnext;
if (mrtentry_ptr->flags & MRTF_KERNEL_CACHE)
/* Delete the kernel cache first */
delete_mrtentry_all_kernel_cache(mrtentry_ptr);
if (mrtentry_ptr->grpprev != (mrtentry_t *) NULL)
mrtentry_ptr->grpprev->grpnext = mrtentry_ptr->grpnext;
else
{
mrtentry_ptr->group->mrtlink = mrtentry_ptr->grpnext;
if ((mrtentry_ptr->grpnext == (mrtentry_t *) NULL)
&& (mrtentry_ptr->group->grp_route == (mrtentry_t *) NULL))
{
/* Delete the group entry if it has no (*,G) routing entry */
delete_grpentry(mrtentry_ptr->group);
}
}
if (mrtentry_ptr->grpnext != (mrtentry_t *) NULL)
mrtentry_ptr->grpnext->grpprev = mrtentry_ptr->grpprev;
FREE_MRTENTRY(mrtentry_ptr);
}
free((char *) srcentry_ptr);
}
void
delete_grpentry(grpentry_ptr)
grpentry_t *grpentry_ptr;
{
mrtentry_t *mrtentry_ptr;
mrtentry_t *mrtentry_next;
if (grpentry_ptr == (grpentry_t *) NULL)
return;
/* TODO: XXX: the first entry is unused and always there */
grpentry_ptr->prev->next = grpentry_ptr->next;
if (grpentry_ptr->next != (grpentry_t *) NULL)
grpentry_ptr->next->prev = grpentry_ptr->prev;
if (grpentry_ptr->grp_route != (mrtentry_t *) NULL)
{
if (grpentry_ptr->grp_route->flags & MRTF_KERNEL_CACHE)
delete_mrtentry_all_kernel_cache(grpentry_ptr->grp_route);
FREE_MRTENTRY(grpentry_ptr->grp_route);
}
/* Delete from the rp_grp_entry chain */
if (grpentry_ptr->active_rp_grp != (rp_grp_entry_t *) NULL)
{
if (grpentry_ptr->rpnext != (grpentry_t *) NULL)
grpentry_ptr->rpnext->rpprev = grpentry_ptr->rpprev;
if (grpentry_ptr->rpprev != (grpentry_t *) NULL)
grpentry_ptr->rpprev->rpnext = grpentry_ptr->rpnext;
else
grpentry_ptr->active_rp_grp->grplink = grpentry_ptr->rpnext;
}
for (mrtentry_ptr = grpentry_ptr->mrtlink;
mrtentry_ptr != (mrtentry_t *) NULL;
mrtentry_ptr = mrtentry_next)
{
mrtentry_next = mrtentry_ptr->grpnext;
if (mrtentry_ptr->flags & MRTF_KERNEL_CACHE)
/* Delete the kernel cache first */
delete_mrtentry_all_kernel_cache(mrtentry_ptr);
if (mrtentry_ptr->srcprev != (mrtentry_t *) NULL)
mrtentry_ptr->srcprev->srcnext = mrtentry_ptr->srcnext;
else
{
mrtentry_ptr->source->mrtlink = mrtentry_ptr->srcnext;
if (mrtentry_ptr->srcnext == (mrtentry_t *) NULL)
{
/* Delete the srcentry if this was the last routing entry */
delete_srcentry(mrtentry_ptr->source);
}
}
if (mrtentry_ptr->srcnext != (mrtentry_t *) NULL)
mrtentry_ptr->srcnext->srcprev = mrtentry_ptr->srcprev;
FREE_MRTENTRY(mrtentry_ptr);
}
free((char *) grpentry_ptr);
}
void
delete_mrtentry(mrtentry_ptr)
mrtentry_t *mrtentry_ptr;
{
grpentry_t *grpentry_ptr;
mrtentry_t *mrtentry_wc;
mrtentry_t *mrtentry_rp;
if (mrtentry_ptr == (mrtentry_t *) NULL)
return;
/* Delete the kernel cache first */
if (mrtentry_ptr->flags & MRTF_KERNEL_CACHE)
delete_mrtentry_all_kernel_cache(mrtentry_ptr);
#ifdef RSRR
/* Tell the reservation daemon */
rsrr_cache_clean(mrtentry_ptr);
#endif /* RSRR */
if (mrtentry_ptr->flags & MRTF_PMBR)
{
/* (*,*,RP) mrtentry */
mrtentry_ptr->source->mrtlink = (mrtentry_t *) NULL;
}
else
if (mrtentry_ptr->flags & MRTF_SG)
{
/* (S,G) mrtentry */
/* Delete from the grpentry MRT chain */
if (mrtentry_ptr->grpprev != (mrtentry_t *) NULL)
mrtentry_ptr->grpprev->grpnext = mrtentry_ptr->grpnext;
else
{
mrtentry_ptr->group->mrtlink = mrtentry_ptr->grpnext;
if (mrtentry_ptr->grpnext == (mrtentry_t *) NULL)
{
/*
* All (S,G) MRT entries are gone. Allow creating (*,G)
* MFC entries.
*/
mrtentry_rp
= mrtentry_ptr->group->active_rp_grp->rp->rpentry->mrtlink;
mrtentry_wc = mrtentry_ptr->group->grp_route;
if (mrtentry_rp != (mrtentry_t *) NULL)
mrtentry_rp->flags &= ~MRTF_MFC_CLONE_SG;
if (mrtentry_wc != (mrtentry_t *) NULL)
mrtentry_wc->flags &= ~MRTF_MFC_CLONE_SG;
else
{
/*
* Delete the group entry if it has no (*,G) routing
* entry
*/
delete_grpentry(mrtentry_ptr->group);
}
}
}
if (mrtentry_ptr->grpnext != (mrtentry_t *) NULL)
mrtentry_ptr->grpnext->grpprev = mrtentry_ptr->grpprev;
/* Delete from the srcentry MRT chain */
if (mrtentry_ptr->srcprev != (mrtentry_t *) NULL)
mrtentry_ptr->srcprev->srcnext = mrtentry_ptr->srcnext;
else
{
mrtentry_ptr->source->mrtlink = mrtentry_ptr->srcnext;
if (mrtentry_ptr->srcnext == (mrtentry_t *) NULL)
{
/* Delete the srcentry if this was the last routing entry */
delete_srcentry(mrtentry_ptr->source);
}
}
if (mrtentry_ptr->srcnext != (mrtentry_t *) NULL)
mrtentry_ptr->srcnext->srcprev = mrtentry_ptr->srcprev;
}
else
{
/* This mrtentry should be (*,G) */
grpentry_ptr = mrtentry_ptr->group;
grpentry_ptr->grp_route = (mrtentry_t *) NULL;
if (grpentry_ptr->mrtlink == (mrtentry_t *) NULL)
/* Delete the group entry if it has no (S,G) entries */
delete_grpentry(grpentry_ptr);
}
FREE_MRTENTRY(mrtentry_ptr);
}
static int
search_srclist(source, sourceEntry)
struct sockaddr_in6 *source;
register srcentry_t **sourceEntry;
{
register srcentry_t *s_prev,
*s;
for (s_prev = srclist, s = s_prev->next; s != (srcentry_t *) NULL;
s_prev = s, s = s->next)
{
/*
* The srclist is ordered with the smallest addresses first. The
* first entry is not used.
*/
if (inet6_lessthan(&s->address, source))
continue;
if (inet6_equal(&s->address, source))
{
*sourceEntry = s;
return (TRUE);
}
break;
}
*sourceEntry = s_prev; /* The insertion point is between s_prev and
* s */
return (FALSE);
}
static int
search_grplist(group, groupEntry)
struct sockaddr_in6 *group;
register grpentry_t **groupEntry;
{
register grpentry_t *g_prev,
*g;
for (g_prev = grplist, g = g_prev->next; g != (grpentry_t *) NULL;
g_prev = g, g = g->next)
{
/*
* The grplist is ordered with the smallest address first. The first
* entry is not used.
*/
if (inet6_lessthan(&g->group, group))
continue;
if (inet6_equal(&g->group, group))
{
*groupEntry = g;
return (TRUE);
}
break;
}
*groupEntry = g_prev; /* The insertion point is between g_prev and
* g */
return (FALSE);
}
static srcentry_t *
create_srcentry(source)
struct sockaddr_in6 *source;
{
register srcentry_t *srcentry_ptr;
srcentry_t *srcentry_prev;
if (search_srclist(source, &srcentry_prev) == TRUE)
return (srcentry_prev);
srcentry_ptr = (srcentry_t *) malloc(sizeof(srcentry_t));
if (srcentry_ptr == (srcentry_t *) NULL)
{
log(LOG_WARNING, 0, "Memory allocation error for srcentry %s",
inet6_fmt(&source->sin6_addr));
return (srcentry_t *) NULL;
}
srcentry_ptr->address = *source;
/*
* Free the memory if there is error getting the iif and the next hop
* (upstream) router.
*/
if (set_incoming(srcentry_ptr, PIM_IIF_SOURCE) == FALSE)
{
free((char *) srcentry_ptr);
return (srcentry_t *) NULL;
}
srcentry_ptr->mrtlink = (mrtentry_t *) NULL;
RESET_TIMER(srcentry_ptr->timer);
srcentry_ptr->cand_rp = (cand_rp_t *) NULL;
srcentry_ptr->next = srcentry_prev->next;
srcentry_prev->next = srcentry_ptr;
srcentry_ptr->prev = srcentry_prev;
if (srcentry_ptr->next != (srcentry_t *) NULL)
srcentry_ptr->next->prev = srcentry_ptr;
IF_DEBUG(DEBUG_MFC)
log(LOG_DEBUG, 0, "create source entry, source %s",
inet6_fmt(&source->sin6_addr));
return (srcentry_ptr);
}
static grpentry_t *
create_grpentry(group)
struct sockaddr_in6 *group;
{
register grpentry_t *grpentry_ptr;
grpentry_t *grpentry_prev;
if (search_grplist(group, &grpentry_prev) == TRUE)
return (grpentry_prev);
grpentry_ptr = (grpentry_t *) malloc(sizeof(grpentry_t));
if (grpentry_ptr == (grpentry_t *) NULL)
{
log(LOG_WARNING, 0, "Memory allocation error for grpentry %s",
inet6_fmt(&group->sin6_addr));
return (grpentry_t *) NULL;
}
/*
* TODO: XXX: Note that this is NOT a (*,G) routing entry, but simply a
* group entry, probably used to search the routing table (to find (S,G)
* entries for example.) To become (*,G) routing entry, we must setup
* grpentry_ptr->grp_route
*/
grpentry_ptr->group = *group;
memset(&grpentry_ptr->rpaddr, 0, sizeof(struct sockaddr_in6));
grpentry_ptr->rpaddr.sin6_len = sizeof(struct sockaddr_in6);
grpentry_ptr->rpaddr.sin6_family = AF_INET6;
grpentry_ptr->mrtlink = (mrtentry_t *) NULL;
grpentry_ptr->active_rp_grp = (rp_grp_entry_t *) NULL;
grpentry_ptr->grp_route = (mrtentry_t *) NULL;
grpentry_ptr->rpnext = (grpentry_t *) NULL;
grpentry_ptr->rpprev = (grpentry_t *) NULL;
/* Now it is safe to include the new group entry */
grpentry_ptr->next = grpentry_prev->next;
grpentry_prev->next = grpentry_ptr;
grpentry_ptr->prev = grpentry_prev;
if (grpentry_ptr->next != (grpentry_t *) NULL)
grpentry_ptr->next->prev = grpentry_ptr;
IF_DEBUG(DEBUG_MFC)
log(LOG_DEBUG, 0, "create group entry, group %s", inet6_fmt(&group->sin6_addr));
return (grpentry_ptr);
}
/*
* Return TRUE if the entry is found and then *mrtPtr is set to point to that
* entry. Otherwise return FALSE and *mrtPtr points the the previous entry
* (or NULL if first in the chain.
*/
static int
search_srcmrtlink(srcentry_ptr, group, mrtPtr)
srcentry_t *srcentry_ptr;
struct sockaddr_in6 *group;
mrtentry_t **mrtPtr;
{
register mrtentry_t *mrtentry_ptr;
register mrtentry_t *m_prev = (mrtentry_t *) NULL;
for (mrtentry_ptr = srcentry_ptr->mrtlink;
mrtentry_ptr != (mrtentry_t *) NULL;
m_prev = mrtentry_ptr, mrtentry_ptr = mrtentry_ptr->srcnext)
{
/*
* The entries are ordered with the smaller group address first. The
* addresses are in network order.
*/
if (inet6_lessthan(&mrtentry_ptr->group->group, group))
continue;
if (inet6_equal(&mrtentry_ptr->group->group, group))
{
*mrtPtr = mrtentry_ptr;
return (TRUE);
}
break;
}
*mrtPtr = m_prev;
return (FALSE);
}
/*
* Return TRUE if the entry is found and then *mrtPtr is set to point to that
* entry. Otherwise return FALSE and *mrtPtr points the the previous entry
* (or NULL if first in the chain.
*/
static int
search_grpmrtlink(grpentry_ptr, source, mrtPtr)
grpentry_t *grpentry_ptr;
struct sockaddr_in6 *source;
mrtentry_t **mrtPtr;
{
register mrtentry_t *mrtentry_ptr;
register mrtentry_t *m_prev = (mrtentry_t *) NULL;
for (mrtentry_ptr = grpentry_ptr->mrtlink;
mrtentry_ptr != (mrtentry_t *) NULL;
m_prev = mrtentry_ptr, mrtentry_ptr = mrtentry_ptr->grpnext)
{
/*
* The entries are ordered with the smaller source address first. The
* addresses are in network order.
*/
if (inet6_lessthan(&mrtentry_ptr->source->address, source))
continue;
if (inet6_equal(source, &mrtentry_ptr->source->address))
{
*mrtPtr = mrtentry_ptr;
return (TRUE);
}
break;
}
*mrtPtr = m_prev;
return (FALSE);
}
static void
insert_srcmrtlink(mrtentry_new, mrtentry_prev, srcentry_ptr)
mrtentry_t *mrtentry_new;
mrtentry_t *mrtentry_prev;
srcentry_t *srcentry_ptr;
{
if (mrtentry_prev == (mrtentry_t *) NULL)
{
/* Has to be insert as the head entry for this source */
mrtentry_new->srcnext = srcentry_ptr->mrtlink;
mrtentry_new->srcprev = (mrtentry_t *) NULL;
srcentry_ptr->mrtlink = mrtentry_new;
}
else
{
/* Insert right after the mrtentry_prev */
mrtentry_new->srcnext = mrtentry_prev->srcnext;
mrtentry_new->srcprev = mrtentry_prev;
mrtentry_prev->srcnext = mrtentry_new;
}
if (mrtentry_new->srcnext != (mrtentry_t *) NULL)
mrtentry_new->srcnext->srcprev = mrtentry_new;
}
static void
insert_grpmrtlink(mrtentry_new, mrtentry_prev, grpentry_ptr)
mrtentry_t *mrtentry_new;
mrtentry_t *mrtentry_prev;
grpentry_t *grpentry_ptr;
{
if (mrtentry_prev == (mrtentry_t *) NULL)
{
/* Has to be insert as the head entry for this group */
mrtentry_new->grpnext = grpentry_ptr->mrtlink;
mrtentry_new->grpprev = (mrtentry_t *) NULL;
grpentry_ptr->mrtlink = mrtentry_new;
}
else
{
/* Insert right after the mrtentry_prev */
mrtentry_new->grpnext = mrtentry_prev->grpnext;
mrtentry_new->grpprev = mrtentry_prev;
mrtentry_prev->grpnext = mrtentry_new;
}
if (mrtentry_new->grpnext != (mrtentry_t *) NULL)
mrtentry_new->grpnext->grpprev = mrtentry_new;
}
static mrtentry_t *
alloc_mrtentry(srcentry_ptr, grpentry_ptr)
srcentry_t *srcentry_ptr;
grpentry_t *grpentry_ptr;
{
register mrtentry_t *mrtentry_ptr;
u_int16 i,
*i_ptr;
u_int8 vif_numbers;
mrtentry_ptr = (mrtentry_t *) malloc(sizeof(mrtentry_t));
if (mrtentry_ptr == (mrtentry_t *) NULL)
{
log(LOG_WARNING, 0, "alloc_mrtentry(): out of memory");
return (mrtentry_t *) NULL;
}
/*
* grpnext, grpprev, srcnext, srcprev will be setup when we link the
* mrtentry to the source and group chains
*/
mrtentry_ptr->source = srcentry_ptr;
mrtentry_ptr->group = grpentry_ptr;
mrtentry_ptr->incoming = NO_VIF;
IF_ZERO(&mrtentry_ptr->joined_oifs);
IF_ZERO(&mrtentry_ptr->leaves);
IF_ZERO(&mrtentry_ptr->pruned_oifs);
IF_ZERO(&mrtentry_ptr->asserted_oifs);
IF_ZERO(&mrtentry_ptr->oifs);
mrtentry_ptr->upstream = (pim_nbr_entry_t *) NULL;
mrtentry_ptr->metric = 0;
mrtentry_ptr->preference = 0;
mrtentry_ptr->pmbr_addr.sin6_addr = in6addr_any;
mrtentry_ptr->pmbr_addr.sin6_len = sizeof(struct sockaddr_in6);
mrtentry_ptr->pmbr_addr.sin6_family = AF_INET6;
#ifdef RSRR
mrtentry_ptr->rsrr_cache = (struct rsrr_cache *) NULL;
#endif /* RSRR */
/*
* XXX: TODO: if we are short in memory, we can reserve as few as
* possible space for vif timers (per group and/or routing entry), but
* then everytime when a new interfaces is configured, the router will be
* restarted and will delete the whole routing table. The "memory is
* cheap" solution is to reserve timer space for all potential vifs in
* advance and then no need to delete the routing table and disturb the
* forwarding.
*/
#ifdef SAVE_MEMORY
mrtentry_ptr->vif_timers = (u_int16 *) malloc(sizeof(u_int16) * numvifs);
mrtentry_ptr->vif_deletion_delay =
(u_int16 *) malloc(sizeof(u_int16) * numvifs);
vif_numbers = numvifs;
#else
mrtentry_ptr->vif_timers =
(u_int16 *) malloc(sizeof(u_int16) * total_interfaces);
mrtentry_ptr->vif_deletion_delay =
(u_int16 *) malloc(sizeof(u_int16) * total_interfaces);
vif_numbers = total_interfaces;
#endif /* SAVE_MEMORY */
if ((mrtentry_ptr->vif_timers == (u_int16 *) NULL) ||
(mrtentry_ptr->vif_deletion_delay == (u_int16 *) NULL))
{
log(LOG_WARNING, 0, "alloc_mrtentry(): out of memory");
FREE_MRTENTRY(mrtentry_ptr);
return (mrtentry_t *) NULL;
}
/* Reset the timers */
for (i = 0, i_ptr = mrtentry_ptr->vif_timers; i < vif_numbers;
i++, i_ptr++)
RESET_TIMER(*i_ptr);
for (i = 0, i_ptr = mrtentry_ptr->vif_deletion_delay; i < vif_numbers;
i++, i_ptr++)
RESET_TIMER(*i_ptr);
mrtentry_ptr->flags = MRTF_NEW;
RESET_TIMER(mrtentry_ptr->timer);
RESET_TIMER(mrtentry_ptr->jp_timer);
RESET_TIMER(mrtentry_ptr->rs_timer);
RESET_TIMER(mrtentry_ptr->assert_timer);
RESET_TIMER(mrtentry_ptr->assert_rate_timer);
mrtentry_ptr->kernel_cache = (kernel_cache_t *) NULL;
return (mrtentry_ptr);
}
static mrtentry_t *
create_mrtentry(srcentry_ptr, grpentry_ptr, flags)
srcentry_t *srcentry_ptr;
grpentry_t *grpentry_ptr;
u_int16 flags;
{
mrtentry_t *r_new;
mrtentry_t *r_grp_insert,
*r_src_insert; /* pointers to insert */
struct sockaddr_in6 *source;
struct sockaddr_in6 *group;
if (flags & MRTF_SG)
{
/* (S,G) entry */
source = &srcentry_ptr->address;
group = &grpentry_ptr->group;
if (search_grpmrtlink(grpentry_ptr, source, &r_grp_insert) == TRUE)
{
return (r_grp_insert);
}
if (search_srcmrtlink(srcentry_ptr, group, &r_src_insert) == TRUE)
{
/*
* Hmmm, search_grpmrtlink() didn't find the entry, but
* search_srcmrtlink() did find it! Shoudn't happen. Panic!
*/
log(LOG_ERR, 0, "MRT inconsistency for src %s and grp %s\n",
inet6_fmt(&source->sin6_addr), inet6_fmt(&group->sin6_addr));
/* not reached but to make lint happy */
return (mrtentry_t *) NULL;
}
/*
* Create and insert in group mrtlink and source mrtlink chains.
*/
r_new = alloc_mrtentry(srcentry_ptr, grpentry_ptr);
if (r_new == (mrtentry_t *) NULL)
return (mrtentry_t *) NULL;
/*
* r_new has to be insert right after r_grp_insert in the grp mrtlink
* chain and right after r_src_insert in the src mrtlink chain
*/
insert_grpmrtlink(r_new, r_grp_insert, grpentry_ptr);
insert_srcmrtlink(r_new, r_src_insert, srcentry_ptr);
r_new->flags |= MRTF_SG;
IF_DEBUG(DEBUG_MFC)
log(LOG_DEBUG, 0, "create SG entry, source %s, group %s",
inet6_fmt(&source->sin6_addr),
inet6_fmt(&group->sin6_addr));
return (r_new);
}
if (flags & MRTF_WC)
{
/* (*,G) entry */
if (grpentry_ptr->grp_route != (mrtentry_t *) NULL)
return (grpentry_ptr->grp_route);
r_new = alloc_mrtentry(srcentry_ptr, grpentry_ptr);
if (r_new == (mrtentry_t *) NULL)
return (mrtentry_t *) NULL;
grpentry_ptr->grp_route = r_new;
r_new->flags |= (MRTF_WC | MRTF_RP);
return (r_new);
}
if (flags & MRTF_PMBR)
{
/* (*,*,RP) entry */
if (srcentry_ptr->mrtlink != (mrtentry_t *) NULL)
return (srcentry_ptr->mrtlink);
r_new = alloc_mrtentry(srcentry_ptr, grpentry_ptr);
if (r_new == (mrtentry_t *) NULL)
return (mrtentry_t *) NULL;
srcentry_ptr->mrtlink = r_new;
r_new->flags |= (MRTF_PMBR | MRTF_RP);
return (r_new);
}
return (mrtentry_t *) NULL;
}
/*
* Delete all kernel cache for this mrtentry
*/
void
delete_mrtentry_all_kernel_cache(mrtentry_ptr)
mrtentry_t *mrtentry_ptr;
{
kernel_cache_t *kernel_cache_prev;
kernel_cache_t *kernel_cache_ptr;
if (!(mrtentry_ptr->flags & MRTF_KERNEL_CACHE))
{
return;
}
/* Free all kernel_cache entries */
for (kernel_cache_ptr = mrtentry_ptr->kernel_cache;
kernel_cache_ptr != (kernel_cache_t *) NULL;)
{
kernel_cache_prev = kernel_cache_ptr;
kernel_cache_ptr = kernel_cache_ptr->next;
k_del_mfc(mld6_socket, &kernel_cache_prev->source,
&kernel_cache_prev->group);
free((char *) kernel_cache_prev);
}
mrtentry_ptr->kernel_cache = (kernel_cache_t *) NULL;
/* turn off the cache flag(s) */
mrtentry_ptr->flags &= ~(MRTF_KERNEL_CACHE | MRTF_MFC_CLONE_SG);
}
void
delete_single_kernel_cache(mrtentry_ptr, kernel_cache_ptr)
mrtentry_t *mrtentry_ptr;
kernel_cache_t *kernel_cache_ptr;
{
if (kernel_cache_ptr->prev == (kernel_cache_t *) NULL)
{
mrtentry_ptr->kernel_cache = kernel_cache_ptr->next;
if (mrtentry_ptr->kernel_cache == (kernel_cache_t *) NULL)
mrtentry_ptr->flags &= ~(MRTF_KERNEL_CACHE | MRTF_MFC_CLONE_SG);
}
else
kernel_cache_ptr->prev->next = kernel_cache_ptr->next;
if (kernel_cache_ptr->next != (kernel_cache_t *) NULL)
kernel_cache_ptr->next->prev = kernel_cache_ptr->prev;
IF_DEBUG(DEBUG_MFC)
log(LOG_DEBUG, 0, "Deleting MFC entry for source %s and group %s",
inet6_fmt(&kernel_cache_ptr->source.sin6_addr),
inet6_fmt(&kernel_cache_ptr->source.sin6_addr));
k_del_mfc(mld6_socket, &kernel_cache_ptr->source,
&kernel_cache_ptr->group);
free((char *) kernel_cache_ptr);
}
void
delete_single_kernel_cache_addr(mrtentry_ptr, source, group)
mrtentry_t *mrtentry_ptr;
struct sockaddr_in6 *source;
struct sockaddr_in6 *group;
{
kernel_cache_t *kernel_cache_ptr;
if (mrtentry_ptr == (mrtentry_t *) NULL)
return;
/* Find the exact (S,G) kernel_cache entry */
for (kernel_cache_ptr = mrtentry_ptr->kernel_cache;
kernel_cache_ptr != (kernel_cache_t *) NULL;
kernel_cache_ptr = kernel_cache_ptr->next)
{
if (inet6_lessthan(&kernel_cache_ptr->group, group))
continue;
if (inet6_greaterthan(&kernel_cache_ptr->group, group))
return; /* Not found */
if (inet6_lessthan(&kernel_cache_ptr->source, source))
continue;
if (inet6_greaterthan(&kernel_cache_ptr->source, source))
return; /* Not found */
/* Found exact match */
break;
}
if (kernel_cache_ptr == (kernel_cache_t *) NULL)
return;
/* Found. Delete it */
if (kernel_cache_ptr->prev == (kernel_cache_t *) NULL)
{
mrtentry_ptr->kernel_cache = kernel_cache_ptr->next;
if (mrtentry_ptr->kernel_cache == (kernel_cache_t *) NULL)
mrtentry_ptr->flags &= ~(MRTF_KERNEL_CACHE | MRTF_MFC_CLONE_SG);
}
else
kernel_cache_ptr->prev->next = kernel_cache_ptr->next;
if (kernel_cache_ptr->next != (kernel_cache_t *) NULL)
kernel_cache_ptr->next->prev = kernel_cache_ptr->prev;
IF_DEBUG(DEBUG_MFC)
log(LOG_DEBUG, 0, "Deleting MFC entry for source %s and group %s",
inet6_fmt(&kernel_cache_ptr->source.sin6_addr),
inet6_fmt(&kernel_cache_ptr->group.sin6_addr));
k_del_mfc(mld6_socket, &kernel_cache_ptr->source,
&kernel_cache_ptr->group);
free((char *) kernel_cache_ptr);
}
/*
* Installs kernel cache for (source, group). Assumes mrtentry_ptr is the
* correct entry.
*/
void
add_kernel_cache(mrtentry_ptr, source, group, flags)
mrtentry_t *mrtentry_ptr;
struct sockaddr_in6 *source;
struct sockaddr_in6 *group;
u_int16 flags;
{
kernel_cache_t *kernel_cache_next;
kernel_cache_t *kernel_cache_prev;
kernel_cache_t *kernel_cache_new;
if (mrtentry_ptr == (mrtentry_t *) NULL)
return;
move_kernel_cache(mrtentry_ptr, flags);
if (mrtentry_ptr->flags & MRTF_SG)
{
/* (S,G) */
if (mrtentry_ptr->flags & MRTF_KERNEL_CACHE)
return;
kernel_cache_new = (kernel_cache_t *) malloc(sizeof(kernel_cache_t));
kernel_cache_new->next = (kernel_cache_t *) NULL;
kernel_cache_new->prev = (kernel_cache_t *) NULL;
kernel_cache_new->source = *source;
kernel_cache_new->group = *group;
kernel_cache_new->sg_count.pktcnt = 0;
kernel_cache_new->sg_count.bytecnt = 0;
kernel_cache_new->sg_count.wrong_if = 0;
mrtentry_ptr->kernel_cache = kernel_cache_new;
mrtentry_ptr->flags |= MRTF_KERNEL_CACHE;
return;
}
kernel_cache_prev = (kernel_cache_t *) NULL;
for (kernel_cache_next = mrtentry_ptr->kernel_cache;
kernel_cache_next != (kernel_cache_t *) NULL;
kernel_cache_prev = kernel_cache_next,
kernel_cache_next = kernel_cache_next->next)
{
if (inet6_lessthan(&kernel_cache_next->group , group))
continue;
if (inet6_greaterthan(&kernel_cache_next->group , group))
break;
if (inet6_lessthan(&kernel_cache_next->source , source))
continue;
if (inet6_greaterthan(&kernel_cache_next->source , source))
break;
/* Found exact match. Nothing to change. */
return;
}
/*
* The new entry must be placed between kernel_cache_prev and
* kernel_cache_next
*/
kernel_cache_new = (kernel_cache_t *) malloc(sizeof(kernel_cache_t));
if (kernel_cache_prev != (kernel_cache_t *) NULL)
kernel_cache_prev->next = kernel_cache_new;
else
mrtentry_ptr->kernel_cache = kernel_cache_new;
if (kernel_cache_next != (kernel_cache_t *) NULL)
kernel_cache_next->prev = kernel_cache_new;
kernel_cache_new->prev = kernel_cache_prev;
kernel_cache_new->next = kernel_cache_next;
kernel_cache_new->source = *source;
kernel_cache_new->group = *group;
kernel_cache_new->sg_count.pktcnt = 0;
kernel_cache_new->sg_count.bytecnt = 0;
kernel_cache_new->sg_count.wrong_if = 0;
mrtentry_ptr->flags |= MRTF_KERNEL_CACHE;
}
/*
* Bring the kernel cache "UP": from the (*,*,RP) to (*,G) or (S,G)
*/
static void
move_kernel_cache(mrtentry_ptr, flags)
mrtentry_t *mrtentry_ptr;
u_int16 flags;
{
kernel_cache_t *kernel_cache_ptr;
kernel_cache_t *insert_kernel_cache_ptr;
kernel_cache_t *first_kernel_cache_ptr;
kernel_cache_t *last_kernel_cache_ptr;
kernel_cache_t *prev_kernel_cache_ptr;
mrtentry_t *mrtentry_pmbr;
mrtentry_t *mrtentry_rp;
int found;
if (mrtentry_ptr == (mrtentry_t *) NULL)
return;
if (mrtentry_ptr->flags & MRTF_PMBR)
return;
if (mrtentry_ptr->flags & MRTF_WC)
{
/* Move the cache info from (*,*,RP) to (*,G) */
mrtentry_pmbr =
mrtentry_ptr->group->active_rp_grp->rp->rpentry->mrtlink;
if (mrtentry_pmbr == (mrtentry_t *) NULL)
return; /* Nothing to move */
first_kernel_cache_ptr = last_kernel_cache_ptr =
(kernel_cache_t *) NULL;
for (kernel_cache_ptr = mrtentry_pmbr->kernel_cache;
kernel_cache_ptr != (kernel_cache_t *) NULL;
kernel_cache_ptr = kernel_cache_ptr->next)
{
/*
* The order is: (1) smaller group; (2) smaller source within
* group
*/
if (inet6_lessthan(&kernel_cache_ptr->group, &mrtentry_ptr->group->group))
continue;
if (!inet6_equal(&kernel_cache_ptr->group, &mrtentry_ptr->group->group))
break;
/* Select the kernel_cache entries to move */
if (first_kernel_cache_ptr == (kernel_cache_t *) NULL)
{
first_kernel_cache_ptr = last_kernel_cache_ptr =
kernel_cache_ptr;
}
else
last_kernel_cache_ptr = kernel_cache_ptr;
}
if (first_kernel_cache_ptr != (kernel_cache_t *) NULL)
{
/* Fix the old chain */
if (first_kernel_cache_ptr->prev != (kernel_cache_t *) NULL)
{
first_kernel_cache_ptr->prev->next =
last_kernel_cache_ptr->next;
}
else
mrtentry_pmbr->kernel_cache = last_kernel_cache_ptr->next;
if (last_kernel_cache_ptr->next != (kernel_cache_t *) NULL)
last_kernel_cache_ptr->next->prev =
first_kernel_cache_ptr->prev;
if (mrtentry_pmbr->kernel_cache == (kernel_cache_t *) NULL)
mrtentry_pmbr->flags
&= ~(MRTF_KERNEL_CACHE | MRTF_MFC_CLONE_SG);
/* Insert in the new place */
prev_kernel_cache_ptr = (kernel_cache_t *) NULL;
last_kernel_cache_ptr->next = (kernel_cache_t *) NULL;
mrtentry_ptr->flags |= MRTF_KERNEL_CACHE;
for (kernel_cache_ptr = mrtentry_ptr->kernel_cache;
kernel_cache_ptr != (kernel_cache_t *) NULL;)
{
if (first_kernel_cache_ptr == (kernel_cache_t *) NULL)
break; /* All entries have been inserted */
if (inet6_greaterthan(&kernel_cache_ptr->source,&first_kernel_cache_ptr->source))
{
/* Insert the entry before kernel_cache_ptr */
insert_kernel_cache_ptr = first_kernel_cache_ptr;
first_kernel_cache_ptr = first_kernel_cache_ptr->next;
if (kernel_cache_ptr->prev != (kernel_cache_t *) NULL)
kernel_cache_ptr->prev->next =
insert_kernel_cache_ptr;
else
mrtentry_ptr->kernel_cache =
insert_kernel_cache_ptr;
insert_kernel_cache_ptr->prev =
kernel_cache_ptr->prev;
insert_kernel_cache_ptr->next = kernel_cache_ptr;
kernel_cache_ptr->prev = insert_kernel_cache_ptr;
}
prev_kernel_cache_ptr = kernel_cache_ptr;
kernel_cache_ptr = kernel_cache_ptr->next;
}
if (first_kernel_cache_ptr != (kernel_cache_t *) NULL)
{
/* Place all at the end after prev_kernel_cache_ptr */
if (prev_kernel_cache_ptr != (kernel_cache_t *) NULL)
prev_kernel_cache_ptr->next = first_kernel_cache_ptr;
else
mrtentry_ptr->kernel_cache = first_kernel_cache_ptr;
first_kernel_cache_ptr->prev = prev_kernel_cache_ptr;
}
}
return;
}
if (mrtentry_ptr->flags & MRTF_SG)
{
/*
* (S,G) entry. Move the whole group cache from (*,*,RP) to (*,G) and
* then get the necessary entry from (*,G). TODO: Not optimized! The
* particular entry is moved first to (*,G), then we have to search
* again (*,G) to find it and move to (S,G).
*/
/* TODO: XXX: No need for this? Thinking.... */
/* move_kernel_cache(mrtentry_ptr->group->grp_route, flags); */
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)
return;
if (mrtentry_rp->incoming != mrtentry_ptr->incoming)
{
/*
* XXX: the (*,*,RP) (or (*,G)) iif is different from the (S,G)
* iif. No need to move the cache, because (S,G) don't need it.
* After the first packet arrives on the shortest path, the
* correct cache entry will be created. If (flags &
* MFC_MOVE_FORCE) then we must move the cache. This usually
* happens when switching to the shortest path. The calling
* function will immediately call k_chg_mfc() to modify the
* kernel cache.
*/
if (!(flags & MFC_MOVE_FORCE))
return;
}
/* Find the exact entry */
found = FALSE;
for (kernel_cache_ptr = mrtentry_rp->kernel_cache;
kernel_cache_ptr != (kernel_cache_t *) NULL;
kernel_cache_ptr = kernel_cache_ptr->next)
{
if (inet6_lessthan(&kernel_cache_ptr->group, &mrtentry_ptr->group->group))
continue;
if (inet6_greaterthan(&kernel_cache_ptr->group, &mrtentry_ptr->group->group))
break;
if (inet6_lessthan(&kernel_cache_ptr->source, &mrtentry_ptr->source->address))
continue;
if (inet6_greaterthan(&kernel_cache_ptr->source, &mrtentry_ptr->source->address))
break;
/* We found it! */
if (kernel_cache_ptr->prev != (kernel_cache_t *) NULL)
kernel_cache_ptr->prev->next = kernel_cache_ptr->next;
else
{
mrtentry_rp->kernel_cache = kernel_cache_ptr->next;
}
if (kernel_cache_ptr->next != (kernel_cache_t *) NULL)
kernel_cache_ptr->next->prev = kernel_cache_ptr->prev;
found = TRUE;
break;
}
if (found == TRUE)
{
if (mrtentry_rp->kernel_cache == (kernel_cache_t *) NULL)
mrtentry_rp->flags &= ~(MRTF_KERNEL_CACHE | MRTF_MFC_CLONE_SG);
if (mrtentry_ptr->kernel_cache != (kernel_cache_t *) NULL)
free((char *) mrtentry_ptr->kernel_cache);
mrtentry_ptr->flags |= MRTF_KERNEL_CACHE;
mrtentry_ptr->kernel_cache = kernel_cache_ptr;
kernel_cache_ptr->prev = (kernel_cache_t *) NULL;
kernel_cache_ptr->next = (kernel_cache_t *) NULL;
}
}
}
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