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mrt.c
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mrt.c
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/*
* Copyright (c) 1998-2001
* University of Southern California/Information Sciences Institute.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* $Id: mrt.c,v 1.27 2001/09/10 20:31:36 pavlin Exp $
*/
#include "defs.h"
srcentry_t *srclist;
grpentry_t *grplist;
/*
* Local functions definition
*/
static srcentry_t *create_srcentry (u_int32 source);
static int search_srclist (u_int32 source, srcentry_t **sourceEntry);
static int search_srcmrtlink (srcentry_t *srcentry_ptr, u_int32 group, mrtentry_t **mrtPtr);
static void insert_srcmrtlink (mrtentry_t *elementPtr, mrtentry_t *insertPtr, srcentry_t *srcListPtr);
static grpentry_t *create_grpentry (u_int32 group);
static int search_grplist (u_int32 group, grpentry_t **groupEntry);
static int search_grpmrtlink (grpentry_t *grpentry_ptr, u_int32 source, mrtentry_t **mrtPtr);
static void insert_grpmrtlink (mrtentry_t *elementPtr, mrtentry_t *insertPtr, grpentry_t *grpListPtr);
static mrtentry_t *alloc_mrtentry (srcentry_t *srcentry_ptr, grpentry_t *grpentry_ptr);
static mrtentry_t *create_mrtentry (srcentry_t *srcentry_ptr, grpentry_t *grpentry_ptr, u_int16 flags);
static void move_kernel_cache (mrtentry_t *mrtentry_ptr, u_int16 flags);
void init_pim_mrt(void)
{
/* TODO: delete any existing routing table */
/* Initialize the source list */
/* The first entry has address 'INADDR_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;
srclist->address = INADDR_ANY_N;
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 'INADDR_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;
grplist->group = INADDR_ANY_N;
grplist->rpaddr = INADDR_ANY_N;
grplist->mrtlink = (mrtentry_t *)NULL;
grplist->active_rp_grp = (rp_grp_entry_t *)NULL;
grplist->grp_route = (mrtentry_t *)NULL;
}
grpentry_t *find_group(u_int32 group)
{
grpentry_t *grpentry_ptr;
if (!IN_MULTICAST(ntohl(group)))
return (grpentry_t *)NULL;
if (search_grplist(group, &grpentry_ptr) == TRUE) {
/* Group found! */
return (grpentry_ptr);
}
return (grpentry_t *)NULL;
}
srcentry_t *find_source(u_int32 source)
{
srcentry_t *srcentry_ptr;
if (!inet_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(u_int32 source, u_int32 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;
rp_grp_entry_t *rp_grp_entry_ptr;
if (flags & (MRTF_SG | MRTF_WC)) {
if (!IN_MULTICAST(ntohl(group)))
return (mrtentry_t *)NULL;
}
if (flags & MRTF_SG)
if (!inet_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 != INADDR_ANY_N)
rpentry_ptr = rp_match(group);
else if (source != INADDR_ANY_N)
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 != INADDR_ANY_N)
rpentry_ptr = rp_match(group);
else if (source != INADDR_ANY_N) {
rpentry_ptr = rp_find(source);
if (rpentry_ptr == (rpentry_t *)NULL) {
return (mrtentry_t *)NULL;
}
}
else
return (mrtentry_t *)NULL; /* source == group == INADDR_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_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_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_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(u_int32 source, srcentry_t **sourceEntry)
{
srcentry_t *s_prev,*s;
u_int32 source_h = ntohl(source);
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 (ntohl(s->address) < source_h)
continue;
if (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(u_int32 group, grpentry_t **groupEntry)
{
grpentry_t *g_prev, *g;
u_int32 group_h = ntohl(group);
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 (ntohl(g->group) < group_h)
continue;
if (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(u_int32 source)
{
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) {
logit(LOG_WARNING, 0, "Memory allocation error for srcentry %s",
inet_fmt(source, s1, sizeof(s1)));
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)
logit(LOG_DEBUG, 0, "create source entry, source %s",
inet_fmt(source, s1, sizeof(s1)));
return (srcentry_ptr);
}
static grpentry_t *create_grpentry(u_int32 group)
{
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) {
logit(LOG_WARNING, 0, "Memory allocation error for grpentry %s",
inet_fmt(group, s1, sizeof(s1)));
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;
grpentry_ptr->rpaddr = INADDR_ANY_N;
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)
logit(LOG_DEBUG, 0, "create group entry, group %s", inet_fmt(group, s1, sizeof(s1)));
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 previous entry
* (or NULL if first in the chain.
*/
static int search_srcmrtlink(srcentry_t *srcentry_ptr, u_int32 group, mrtentry_t **mrtPtr)
{
mrtentry_t *mrtentry_ptr;
mrtentry_t *m_prev = (mrtentry_t *)NULL;
u_int32 group_h = ntohl(group);
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 (ntohl(mrtentry_ptr->group->group) < group_h)
continue;
if (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 previous entry
* (or NULL if first in the chain.
*/
static int search_grpmrtlink(grpentry_t *grpentry_ptr, u_int32 source, mrtentry_t **mrtPtr)
{
mrtentry_t *mrtentry_ptr;
mrtentry_t *m_prev = (mrtentry_t *)NULL;
u_int32 source_h = ntohl(source);
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 (ntohl(mrtentry_ptr->source->address) < source_h)
continue;
if (source == mrtentry_ptr->source->address) {
*mrtPtr = mrtentry_ptr;
return(TRUE);
}
break;
}
*mrtPtr = m_prev;
return(FALSE);
}
static void insert_srcmrtlink(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_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_t *srcentry_ptr, grpentry_t *grpentry_ptr)
{
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) {
logit(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;
VIFM_CLRALL(mrtentry_ptr->joined_oifs);
VIFM_CLRALL(mrtentry_ptr->leaves);
VIFM_CLRALL(mrtentry_ptr->pruned_oifs);
VIFM_CLRALL(mrtentry_ptr->asserted_oifs);
VIFM_CLRALL(mrtentry_ptr->oifs);
mrtentry_ptr->upstream = (pim_nbr_entry_t *)NULL;
mrtentry_ptr->metric = 0;
mrtentry_ptr->preference = 0;
mrtentry_ptr->pmbr_addr = INADDR_ANY_N;
#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)) {
logit(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_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 */
u_int32 source;
u_int32 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!
*/
logit(LOG_ERR, 0, "MRT inconsistency for src %s and grp %s\n",
inet_fmt(source, s1, sizeof(s1)), inet_fmt(group, s2, sizeof(s2)));
/* 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;
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_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(igmp_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_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)
logit(LOG_DEBUG, 0, "Deleting MFC entry for source %s and group %s",
inet_fmt(kernel_cache_ptr->source, s1, sizeof(s1)),
inet_fmt(kernel_cache_ptr->group, s2, sizeof(s2)));
k_del_mfc(igmp_socket, kernel_cache_ptr->source,
kernel_cache_ptr->group);
free((char *)kernel_cache_ptr);
}
void delete_single_kernel_cache_addr(mrtentry_t *mrtentry_ptr, u_int32 source, u_int32 group)
{
u_int32 source_h;
u_int32 group_h;
kernel_cache_t *kernel_cache_ptr;
if (mrtentry_ptr == (mrtentry_t *)NULL)
return;
source_h = ntohl(source);
group_h = ntohl(group);
/* 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 (ntohl(kernel_cache_ptr->group) < group_h)
continue;
if (ntohl(kernel_cache_ptr->group) > group_h)
return; /* Not found */
if (ntohl(kernel_cache_ptr->source) < source_h)
continue;
if (ntohl(kernel_cache_ptr->source) > source_h)
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)
logit(LOG_DEBUG, 0, "Deleting MFC entry for source %s and group %s",
inet_fmt(kernel_cache_ptr->source, s1, sizeof(s1)),
inet_fmt(kernel_cache_ptr->group, s2, sizeof(s2)));
k_del_mfc(igmp_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_t *mrtentry_ptr, u_int32 source, u_int32 group, u_int16 flags)
{
u_int32 source_h;
u_int32 group_h;
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;