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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);
static int search_srclist (u_int32, srcentry_t **);
static int search_srcmrtlink (srcentry_t *, u_int32, mrtentry_t **);
static void insert_srcmrtlink (mrtentry_t *, mrtentry_t *, srcentry_t *);
static grpentry_t *create_grpentry (u_int32);
static int search_grplist (u_int32, grpentry_t **);
static int search_grpmrtlink (grpentry_t *, u_int32, mrtentry_t **);
static void insert_grpmrtlink (mrtentry_t *, mrtentry_t *, grpentry_t *);
static mrtentry_t *alloc_mrtentry (srcentry_t *, grpentry_t *);
static mrtentry_t *create_mrtentry (srcentry_t *, grpentry_t *, u_int16);
static void move_kernel_cache (mrtentry_t *, u_int16);
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 *)calloc(1, sizeof(srcentry_t));
if (!srclist)
logit(LOG_ERR, 0, "Ran out of memory in init_pim_mrt()");
srclist->next = NULL;
srclist->prev = NULL;
srclist->address = INADDR_ANY_N;
srclist->mrtlink = NULL;
srclist->incoming = NO_VIF;
srclist->upstream = NULL;
srclist->metric = 0;
srclist->preference = 0;
RESET_TIMER(srclist->timer);
srclist->cand_rp = 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 *)calloc(1, sizeof(grpentry_t));
if (!grplist)
logit(LOG_ERR, 0, "Ran out of memory in init_pim_mrt()");
grplist->next = NULL;
grplist->prev = NULL;
grplist->rpnext = NULL;
grplist->rpprev = NULL;
grplist->group = INADDR_ANY_N;
grplist->rpaddr = INADDR_ANY_N;
grplist->mrtlink = NULL;
grplist->active_rp_grp = NULL;
grplist->grp_route = NULL;
}
grpentry_t *find_group(u_int32 group)
{
grpentry_t *grp;
if (!IN_MULTICAST(ntohl(group)))
return NULL;
if (search_grplist(group, &grp) == TRUE)
return grp; /* Group found! */
return NULL;
}
srcentry_t *find_source(u_int32 source)
{
srcentry_t *src;
if (!inet_valid_host(source))
return NULL;
if (search_srclist(source, &src) == TRUE)
return src; /* Source found! */
return NULL;
}
mrtentry_t *find_route(u_int32 source, u_int32 group, u_int16 flags, char create)
{
srcentry_t *src = NULL;
grpentry_t *grp = NULL;
mrtentry_t *mrt = NULL;
mrtentry_t *mrt_wc = NULL;
mrtentry_t *mrt_pmbr = NULL;
mrtentry_t *mrt2 = NULL;
rpentry_t *rp = NULL;
rp_grp_entry_t *rp_grp = NULL;
if (flags & (MRTF_SG | MRTF_WC)) {
if (!IN_MULTICAST(ntohl(group)))
return NULL;
}
if (flags & MRTF_SG) {
if (!inet_valid_host(source))
return NULL;
}
if (create == DONT_CREATE) {
if (flags & (MRTF_SG | MRTF_WC)) {
if (search_grplist(group, &grp) == FALSE) {
/* Group not found. Return the (*,*,RP) entry */
if (flags & MRTF_PMBR) {
rp = rp_match(group);
if (rp)
return rp->mrtlink;
}
return NULL;
}
/* Search for the source */
if (flags & MRTF_SG) {
if (search_grpmrtlink(grp, source, &mrt) == TRUE) {
/* Exact (S,G) entry found */
return mrt;
}
}
/* No (S,G) entry. Return the (*,G) entry (if exist) */
if ((flags & MRTF_WC) && grp->grp_route)
return grp->grp_route;
}
/* Return the (*,*,RP) entry */
if (flags & MRTF_PMBR) {
rp = NULL;
if (group != INADDR_ANY_N)
rp = rp_match(group);
else if (source != INADDR_ANY_N)
rp = rp_find(source);
if (rp)
return rp->mrtlink;
}
return NULL;
}
/* Creation allowed */
if (flags & (MRTF_SG | MRTF_WC)) {
grp = create_grpentry(group);
if (!grp)
return NULL;
if (!grp->active_rp_grp) {
rp_grp = rp_grp_match(group);
if (!rp_grp) {
if (!grp->mrtlink && !grp->grp_route) {
/* New created grpentry. Delete it. */
delete_grpentry(grp);
}
return NULL;
}
rp = rp_grp->rp->rpentry;
grp->active_rp_grp = rp_grp;
grp->rpaddr = rp->address;
/* Link to the top of the rp_grp_chain */
grp->rpnext = rp_grp->grplink;
rp_grp->grplink = grp;
if (grp->rpnext)
grp->rpnext->rpprev = grp;
}
else {
rp = grp->active_rp_grp->rp->rpentry;
}
}
mrt_wc = mrt_pmbr = NULL;
if (flags & MRTF_WC) {
/* Setup the (*,G) routing entry */
mrt_wc = create_mrtentry(NULL, grp, MRTF_WC);
if (!mrt_wc) {
if (!grp->mrtlink) {
/* New created grpentry. Delete it. */
delete_grpentry(grp);
}
return NULL;
}
if (mrt_wc->flags & MRTF_NEW) {
mrt_pmbr = rp->mrtlink;
/* Copy the oif list from the (*,*,RP) entry */
if (mrt_pmbr) {
VOIF_COPY(mrt_pmbr, mrt_wc);
}
mrt_wc->incoming = rp->incoming;
mrt_wc->upstream = rp->upstream;
mrt_wc->metric = rp->metric;
mrt_wc->preference = rp->preference;
move_kernel_cache(mrt_wc, 0);
#ifdef RSRR
rsrr_cache_bring_up(mrt_wc);
#endif /* RSRR */
}
if (!(flags & MRTF_SG)) {
return mrt_wc;
}
}
if (flags & MRTF_SG) {
/* Setup the (S,G) routing entry */
src = create_srcentry(source);
if (!src) {
/* TODO: XXX: The MRTF_NEW flag check may be misleading?? check */
if ((!grp->grp_route || (grp->grp_route && (grp->grp_route->flags & MRTF_NEW)))
&& !grp->mrtlink) {
/* New created grpentry. Delete it. */
delete_grpentry(grp);
}
return NULL;
}
mrt = create_mrtentry(src, grp, MRTF_SG);
if (!mrt) {
if ((!grp->grp_route
|| (grp->grp_route && (grp->grp_route->flags & MRTF_NEW)))
&& !grp->mrtlink) {
/* New created grpentry. Delete it. */
delete_grpentry(grp);
}
if (!src->mrtlink)
/* New created srcentry. Delete it. */
delete_srcentry(src);
return NULL;
}
if (mrt->flags & MRTF_NEW) {
mrt2 = grp->grp_route;
if (!mrt2)
mrt2 = rp->mrtlink;
/* Copy the oif list from the existing (*,G) or (*,*,RP) entry */
if (mrt2) {
VOIF_COPY(mrt2, mrt);
if (flags & MRTF_RP) {
/* ~(S,G) prune entry */
mrt->incoming = mrt2->incoming;
mrt->upstream = mrt2->upstream;
mrt->metric = mrt2->metric;
mrt->preference = mrt2->preference;
mrt->flags |= MRTF_RP;
}
}
if (!(mrt->flags & MRTF_RP)) {
mrt->incoming = src->incoming;
mrt->upstream = src->upstream;
mrt->metric = src->metric;
mrt->preference = src->preference;
}
move_kernel_cache(mrt, 0);
#ifdef RSRR
rsrr_cache_bring_up(mrt);
#endif /* RSRR */
}
return mrt;
}
if (flags & MRTF_PMBR) {
/* Get/return the (*,*,RP) routing entry */
if (group != INADDR_ANY_N) {
rp = rp_match(group);
} else if (source != INADDR_ANY_N) {
rp = rp_find(source);
if (!rp)
return NULL;
} else {
return NULL; /* source == group == INADDR_ANY */
}
if (rp->mrtlink)
return rp->mrtlink;
mrt = create_mrtentry(rp, NULL, MRTF_PMBR);
if (!mrt)
return NULL;
mrt->incoming = rp->incoming;
mrt->upstream = rp->upstream;
mrt->metric = rp->metric;
mrt->preference = rp->preference;
return mrt;
}
return NULL;
}
void delete_srcentry(srcentry_t *src)
{
mrtentry_t *node;
mrtentry_t *next;
if (!src)
return;
/* TODO: XXX: the first entry is unused and always there */
src->prev->next = src->next;
if (src->next)
src->next->prev = src->prev;
for (node = src->mrtlink; node; node = next) {
next = node->srcnext;
if (node->flags & MRTF_KERNEL_CACHE)
/* Delete the kernel cache first */
delete_mrtentry_all_kernel_cache(node);
if (node->grpprev) {
node->grpprev->grpnext = node->grpnext;
} else {
node->group->mrtlink = node->grpnext;
if (!node->grpnext && !node->group->grp_route)
/* Delete the group entry if it has no (*,G) routing entry */
delete_grpentry(node->group);
}
if (node->grpnext)
node->grpnext->grpprev = node->grpprev;
FREE_MRTENTRY(node);
}
free(src);
}
void delete_grpentry(grpentry_t *grp)
{
mrtentry_t *node;
mrtentry_t *next;
if (!grp)
return;
/* TODO: XXX: the first entry is unused and always there */
grp->prev->next = grp->next;
if (grp->next)
grp->next->prev = grp->prev;
if (grp->grp_route) {
if (grp->grp_route->flags & MRTF_KERNEL_CACHE)
delete_mrtentry_all_kernel_cache(grp->grp_route);
FREE_MRTENTRY(grp->grp_route);
}
/* Delete from the rp_grp_entry chain */
if (grp->active_rp_grp) {
if (grp->rpnext)
grp->rpnext->rpprev = grp->rpprev;
if (grp->rpprev)
grp->rpprev->rpnext = grp->rpnext;
else
grp->active_rp_grp->grplink = grp->rpnext;
}
for (node = grp->mrtlink; node; node = next) {
next = node->grpnext;
if (node->flags & MRTF_KERNEL_CACHE)
/* Delete the kernel cache first */
delete_mrtentry_all_kernel_cache(node);
if (node->srcprev) {
node->srcprev->srcnext = node->srcnext;
} else {
node->source->mrtlink = node->srcnext;
if (!node->srcnext) {
/* Delete the srcentry if this was the last routing entry */
delete_srcentry(node->source);
}
}
if (node->srcnext)
node->srcnext->srcprev = node->srcprev;
FREE_MRTENTRY(node);
}
free(grp);
}
void delete_mrtentry(mrtentry_t *mrt)
{
grpentry_t *grp;
mrtentry_t *mrt_wc;
mrtentry_t *mrt_rp;
if (!mrt)
return;
/* Delete the kernel cache first */
if (mrt->flags & MRTF_KERNEL_CACHE)
delete_mrtentry_all_kernel_cache(mrt);
#ifdef RSRR
/* Tell the reservation daemon */
rsrr_cache_clean(mrt);
#endif /* RSRR */
if (mrt->flags & MRTF_PMBR) {
/* (*,*,RP) mrtentry */
mrt->source->mrtlink = NULL;
} else if (mrt->flags & MRTF_SG) {
/* (S,G) mrtentry */
/* Delete from the grpentry MRT chain */
if (mrt->grpprev) {
mrt->grpprev->grpnext = mrt->grpnext;
} else {
mrt->group->mrtlink = mrt->grpnext;
if (!mrt->grpnext) {
/* All (S,G) MRT entries are gone. Allow creating (*,G) MFC entries. */
mrt_rp = mrt->group->active_rp_grp->rp->rpentry->mrtlink;
mrt_wc = mrt->group->grp_route;
if (mrt_rp)
mrt_rp->flags &= ~MRTF_MFC_CLONE_SG;
if (mrt_wc)
mrt_wc->flags &= ~MRTF_MFC_CLONE_SG;
else
/* Delete the group entry if it has no (*,G) routing entry */
delete_grpentry(mrt->group);
}
}
if (mrt->grpnext)
mrt->grpnext->grpprev = mrt->grpprev;
/* Delete from the srcentry MRT chain */
if (mrt->srcprev) {
mrt->srcprev->srcnext = mrt->srcnext;
} else {
mrt->source->mrtlink = mrt->srcnext;
if (!mrt->srcnext)
/* Delete the srcentry if this was the last routing entry */
delete_srcentry(mrt->source);
}
if (mrt->srcnext)
mrt->srcnext->srcprev = mrt->srcprev;
} else {
/* This mrtentry should be (*,G) */
grp = mrt->group;
grp->grp_route = NULL;
/* Delete the group entry if it has no (S,G) entries */
if (!grp->mrtlink)
delete_grpentry(grp);
}
FREE_MRTENTRY(mrt);
}
static int search_srclist(u_int32 source, srcentry_t **found)
{
srcentry_t *prev, *node;
u_int32 source_h = ntohl(source);
for (prev = srclist, node = prev->next; node; prev = node, node = node->next) {
/* The srclist is ordered with the smallest addresses first.
* The first entry is not used. */
if (ntohl(node->address) < source_h)
continue;
if (node->address == source) {
*found = node;
return TRUE;
}
break;
}
*found = prev; /* The insertion point is between s_prev and s */
return FALSE;
}
static int search_grplist(u_int32 group, grpentry_t **found)
{
grpentry_t *prev, *node;
u_int32 group_h = ntohl(group);
for (prev = grplist, node = prev->next; node; prev = node, node = node->next) {
/* The grplist is ordered with the smallest address first.
* The first entry is not used. */
if (ntohl(node->group) < group_h)
continue;
if (node->group == group) {
*found = node;
return TRUE;
}
break;
}
*found = prev; /* The insertion point is between prev and g */
return FALSE;
}
static srcentry_t *create_srcentry(u_int32 source)
{
srcentry_t *node;
srcentry_t *prev;
if (search_srclist(source, &prev) == TRUE)
return prev;
node = calloc(1, sizeof(srcentry_t));
if (!node) {
logit(LOG_WARNING, 0, "Memory allocation error for srcentry %s",
inet_fmt(source, s1, sizeof(s1)));
return NULL;
}
node->address = source;
/* Free the memory if there is error getting the iif and
* the next hop (upstream) router. */
if (set_incoming(node, PIM_IIF_SOURCE) == FALSE) {
free(node);
return NULL;
}
RESET_TIMER(node->timer);
node->mrtlink = NULL;
node->cand_rp = NULL;
node->next = prev->next;
prev->next = node;
node->prev = prev;
if (node->next)
node->next->prev = node;
IF_DEBUG(DEBUG_MFC) {
logit(LOG_DEBUG, 0, "create source entry, source %s",
inet_fmt(source, s1, sizeof(s1)));
}
return node;
}
static grpentry_t *create_grpentry(u_int32 group)
{
grpentry_t *node;
grpentry_t *prev;
/* If already exists, return it. Otheriwse search_grplist() returns the
* insertion point in prev. */
if (search_grplist(group, &prev) == TRUE)
return prev;
node = calloc(1, sizeof(grpentry_t));
if (!node) {
logit(LOG_WARNING, 0, "Memory allocation error for grpentry %s",
inet_fmt(group, s1, sizeof(s1)));
return 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 node->grp_route
*/
node->group = group;
node->rpaddr = INADDR_ANY_N;
node->mrtlink = NULL;
node->active_rp_grp = NULL;
node->grp_route = NULL;
node->rpnext = NULL;
node->rpprev = NULL;
/* Now it is safe to include the new group entry */
node->next = prev->next;
prev->next = node;
node->prev = prev;
if (node->next)
node->next->prev = node;
IF_DEBUG(DEBUG_MFC) {
logit(LOG_DEBUG, 0, "create group entry, group %s", inet_fmt(group, s1, sizeof(s1)));
}
return node;
}
/*
* Return TRUE if the entry is found and then *found is set to point to
* that entry. Otherwise return FALSE and *found points the previous
* entry, or NULL if first in the chain.
*/
static int search_srcmrtlink(srcentry_t *src, u_int32 group, mrtentry_t **found)
{
mrtentry_t *node;
mrtentry_t *prev = NULL;
u_int32 group_h = ntohl(group);
for (node = src->mrtlink; node; prev = node, node = node->srcnext) {
/* The entries are ordered with the smaller group address first.
* The addresses are in network order. */
if (ntohl(node->group->group) < group_h)
continue;
if (node->group->group == group) {
*found = node;
return TRUE;
}
break;
}
*found = prev;
return FALSE;
}
/*
* Return TRUE if the entry is found and then *found is set to point to
* that entry. Otherwise return FALSE and *found points the previous
* entry, or NULL if first in the chain.
*/
static int search_grpmrtlink(grpentry_t *grp, u_int32 source, mrtentry_t **found)
{
mrtentry_t *node;
mrtentry_t *prev = NULL;
u_int32 source_h = ntohl(source);
for (node = grp->mrtlink; node; prev = node, node = node->grpnext) {
/* The entries are ordered with the smaller source address first.
* The addresses are in network order. */
if (ntohl(node->source->address) < source_h)
continue;
if (source == node->source->address) {
*found = node;
return TRUE;
}
break;
}
*found = prev;
return FALSE;
}
static void insert_srcmrtlink(mrtentry_t *node, mrtentry_t *prev, srcentry_t *src)
{
if (!prev) {
/* Has to be insert as the head entry for this source */
node->srcnext = src->mrtlink;
node->srcprev = NULL;
src->mrtlink = node;
} else {
/* Insert right after the prev */
node->srcnext = prev->srcnext;
node->srcprev = prev;
prev->srcnext = node;
}
if (node->srcnext)
node->srcnext->srcprev = node;
}
static void insert_grpmrtlink(mrtentry_t *node, mrtentry_t *prev, grpentry_t *grp)
{
if (!prev) {
/* Has to be insert as the head entry for this group */
node->grpnext = grp->mrtlink;
node->grpprev = NULL;
grp->mrtlink = node;
} else {
/* Insert right after the prev */
node->grpnext = prev->grpnext;
node->grpprev = prev;
prev->grpnext = node;
}
if (node->grpnext)
node->grpnext->grpprev = node;
}
static mrtentry_t *alloc_mrtentry(srcentry_t *src, grpentry_t *grp)
{
mrtentry_t *mrt;
u_int16 i, *timer;
u_int8 vif_numbers;
mrt = calloc(1, sizeof(mrtentry_t));
if (!mrt) {
logit(LOG_WARNING, 0, "alloc_mrtentry(): out of memory");
return NULL;
}
/*
* grpnext, grpprev, srcnext, srcprev will be setup when we link the
* mrtentry to the source and group chains
*/
mrt->source = src;
mrt->group = grp;
mrt->incoming = NO_VIF;
VIFM_CLRALL(mrt->joined_oifs);
VIFM_CLRALL(mrt->leaves);
VIFM_CLRALL(mrt->pruned_oifs);
VIFM_CLRALL(mrt->asserted_oifs);
VIFM_CLRALL(mrt->oifs);
mrt->upstream = NULL;
mrt->metric = 0;
mrt->preference = 0;
mrt->pmbr_addr = INADDR_ANY_N;
#ifdef RSRR
mrt->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
mrt->vif_timers = (u_int16 *)calloc(1, sizeof(u_int16) * numvifs);
mrt->vif_deletion_delay = (u_int16 *)calloc(1, sizeof(u_int16) * numvifs);
vif_numbers = numvifs;
#else
mrt->vif_timers = (u_int16 *)calloc(1, sizeof(u_int16) * total_interfaces);
mrt->vif_deletion_delay = (u_int16 *)calloc(1, sizeof(u_int16) * total_interfaces);
vif_numbers = total_interfaces;
#endif /* SAVE_MEMORY */
if (!mrt->vif_timers || !mrt->vif_deletion_delay) {
logit(LOG_WARNING, 0, "alloc_mrtentry(): out of memory");
FREE_MRTENTRY(mrt);
return NULL;
}
/* Reset the timers */
for (i = 0, timer = mrt->vif_timers; i < vif_numbers; i++, timer++)
RESET_TIMER(*timer);
for (i = 0, timer = mrt->vif_deletion_delay; i < vif_numbers; i++, timer++)
RESET_TIMER(*timer);
mrt->flags = MRTF_NEW;
RESET_TIMER(mrt->timer);
RESET_TIMER(mrt->jp_timer);
RESET_TIMER(mrt->rs_timer);
RESET_TIMER(mrt->assert_timer);
RESET_TIMER(mrt->assert_rate_timer);
mrt->kernel_cache = NULL;
return mrt;
}
static mrtentry_t *create_mrtentry(srcentry_t *src, grpentry_t *grp, u_int16 flags)
{
mrtentry_t *node;
mrtentry_t *grp_insert, *src_insert; /* pointers to insert */
u_int32 source;
u_int32 group;
if (flags & MRTF_SG) {
/* (S,G) entry */
source = src->address;
group = grp->group;
if (search_grpmrtlink(grp, source, &grp_insert) == TRUE)
return grp_insert;
if (search_srcmrtlink(src, group, &src_insert) == TRUE) {
/* Hmmm, search_grpmrtlink() didn't find the entry, but
* search_srcmrtlink() did find it! Shouldn'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 NULL;
}
/* Create and insert in group mrtlink and source mrtlink chains. */
node = alloc_mrtentry(src, grp);
if (!node)
return NULL;
/* node has to be insert right after grp_insert in the grp
* mrtlink chain and right after src_insert in the src mrtlink
* chain */
insert_grpmrtlink(node, grp_insert, grp);
insert_srcmrtlink(node, src_insert, src);
node->flags |= MRTF_SG;
return node;
}
if (flags & MRTF_WC) {
/* (*,G) entry */
if (grp->grp_route)
return grp->grp_route;
node = alloc_mrtentry(src, grp);
if (!node)
return NULL;
grp->grp_route = node;
node->flags |= (MRTF_WC | MRTF_RP);
return node;
}
if (flags & MRTF_PMBR) {
/* (*,*,RP) entry */
if (src->mrtlink)
return src->mrtlink;
node = alloc_mrtentry(src, grp);
if (!node)
return NULL;
src->mrtlink = node;
node->flags |= (MRTF_PMBR | MRTF_RP);
return node;
}
return NULL;
}
/*
* Delete all kernel cache for this mrtentry
*/
void delete_mrtentry_all_kernel_cache(mrtentry_t *mrt)
{
kernel_cache_t *prev;
kernel_cache_t *node;
if (!(mrt->flags & MRTF_KERNEL_CACHE))
return;
/* Free all kernel_cache entries */
for (node = mrt->kernel_cache; node; ) {
prev = node;
node = node->next;
k_del_mfc(igmp_socket, prev->source, prev->group);
free(prev);
}
mrt->kernel_cache = NULL;
/* turn off the cache flag(s) */
mrt->flags &= ~(MRTF_KERNEL_CACHE | MRTF_MFC_CLONE_SG);
}
void delete_single_kernel_cache(mrtentry_t *mrt, kernel_cache_t *node)
{
if (!mrt || !node)
return;
if (!node->prev) {
mrt->kernel_cache = node->next;
if (!mrt->kernel_cache)
mrt->flags &= ~(MRTF_KERNEL_CACHE | MRTF_MFC_CLONE_SG);
} else {
node->prev->next = node->next;
}
if (node->next)
node->next->prev = node->prev;
IF_DEBUG(DEBUG_MFC) {
logit(LOG_DEBUG, 0, "Deleting MFC entry for source %s and group %s",
inet_fmt(node->source, s1, sizeof(s1)),
inet_fmt(node->group, s2, sizeof(s2)));
}
k_del_mfc(igmp_socket, node->source, node->group);
free(node);
}
void delete_single_kernel_cache_addr(mrtentry_t *mrt, u_int32 source, u_int32 group)
{
u_int32 source_h;
u_int32 group_h;
kernel_cache_t *node;
if (!mrt)
return;
source_h = ntohl(source);
group_h = ntohl(group);
/* Find the exact (S,G) kernel_cache entry */
for (node = mrt->kernel_cache; node; node = node->next) {
if (ntohl(node->group) < group_h)
continue;
if (ntohl(node->group) > group_h)
return; /* Not found */
if (ntohl(node->source) < source_h)
continue;
if (ntohl(node->source) > source_h)
return; /* Not found */
/* Found exact match */
break;
}
if (!node)
return;
/* Found. Delete it */
if (!node->prev) {
mrt->kernel_cache = node->next;
if (!mrt->kernel_cache)
mrt->flags &= ~(MRTF_KERNEL_CACHE | MRTF_MFC_CLONE_SG);
} else{
node->prev->next = node->next;
}
if (node->next)
node->next->prev = node->prev;
IF_DEBUG(DEBUG_MFC) {
logit(LOG_DEBUG, 0, "Deleting MFC entry for source %s and group %s",
inet_fmt(node->source, s1, sizeof(s1)),
inet_fmt(node->group, s2, sizeof(s2)));
}