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freebsd-src/usr.sbin/pim6dd/pim6_proto.c
Yoshinobu Inoue 0fea3d5165 IPv6 multicast routing. 
kernel IPv6 multicast routing support.
  pim6 dense mode daemon
  pim6 sparse mode daemon
  netstat support of IPv6 multicast routing statistics

  Merging to the current and testing with other existing multicast routers
  is done by Tatsuya Jinmei <jinmei@kame.net>, who writes and maintainances
  the base code in KAME distribution.

  Make world check and kernel build check was also successful.
2000-01-28 05:10:56 +00:00

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/*
* Copyright (C) 1998 WIDE Project.
* 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.
*/
/*
* Copyright (c) 1998 by the University of Oregon.
* 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 Oregon.
* The name of the University of Oregon may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THE UNIVERSITY OF OREGON 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 UO, 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
* Kurt Windisch (kurtw@antc.uoregon.edu)
*
* $Id: pim6_proto.c,v 1.4 1999/10/27 11:40:30 jinmei Exp $
*/
/*
* Part of this program has been derived from PIM sparse-mode pimd.
* The pimd program is covered by the license in the accompanying file
* named "LICENSE.pimd".
*
* The pimd program is COPYRIGHT 1998 by University of Southern California.
*
* Part of this program has been derived from mrouted.
* The mrouted program is covered by the license in the accompanying file
* named "LICENSE.mrouted".
*
* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
* Leland Stanford Junior University.
*
* $FreeBSD$
*/
#include "defs.h"
/*
* Local functions definitions.
*/
static int parse_pim6_hello __P((char *pktPtr, int datalen,
struct sockaddr_in6 *src,
u_int16 *holdtime));
static void delayed_join_job __P((void *));
static void schedule_delayed_join __P((mrtentry_t *, struct sockaddr_in6 *));
static void delayed_prune_job __P((void *));
static void schedule_delayed_prune __P((mrtentry_t *, mifi_t, u_int16));
static int compare_metrics __P((u_int32 local_preference,
u_int32 local_metric,
struct sockaddr_in6 *local_address,
u_int32 remote_preference,
u_int32 remote_metric,
struct sockaddr_in6 *remote_address));
static int retransmit_pim6_graft __P((mrtentry_t *));
static void retransmit_all_pim6_grafts __P((void *));
if_set nbr_mifs; /* Mifs that have one or more neighbors attached */
/************************************************************************
* PIM_HELLO
************************************************************************/
int
receive_pim6_hello(src, pim_message, datalen)
struct sockaddr_in6 *src;
register char *pim_message;
int datalen;
{
mifi_t mifi;
struct uvif *v;
register pim_nbr_entry_t *nbr, *prev_nbr, *new_nbr;
u_int16 holdtime;
u_int8 *data_ptr;
int state_change;
srcentry_t *srcentry_ptr;
srcentry_t *srcentry_ptr_next;
mrtentry_t *mrtentry_ptr;
u_long random_delay;
if ((mifi = find_vif_direct(src)) == NO_VIF) {
/* Either a local vif or somehow received PIM_HELLO from
* non-directly connected router. Ignore it.
*/
if (local_address(src) == NO_VIF)
log(LOG_INFO, 0,
"Ignoring PIM_HELLO from non-neighbor router %s",
inet6_fmt(&src->sin6_addr));
return(FALSE);
}
v = &uvifs[mifi];
if (v->uv_flags & (VIFF_DOWN | VIFF_DISABLED))
return(FALSE); /* Shoudn't come on this interface */
data_ptr = (u_int8 *)(pim_message + sizeof(struct pim));
/* Get the Holdtime (in seconds) from the message. Return if error. */
if (parse_pim6_hello(pim_message, datalen, src, &holdtime) == FALSE)
return(FALSE);
IF_DEBUG(DEBUG_PIM_HELLO | DEBUG_PIM_TIMER)
log(LOG_DEBUG, 0, "PIM HELLO holdtime from %s is %u",
inet6_fmt(&src->sin6_addr), holdtime);
for (prev_nbr = (pim_nbr_entry_t *)NULL, nbr = v->uv_pim_neighbors;
nbr != (pim_nbr_entry_t *)NULL;
prev_nbr = nbr, nbr = nbr->next) {
/* The PIM neighbors are sorted in decreasing order of the
* network addresses (note that to be able to compare them
* correctly we must translate the addresses in host order.
*/
if (inet6_lessthan(src, &nbr->address))
continue;
if (inet6_equal(src, &nbr->address)) {
/* We already have an entry for this host */
if (0 == holdtime) {
/*
* Looks like we have a nice neighbor who is
* going down and wants to inform us by sending
* "holdtime=0". Thanks buddy and see you again!
*/
log(LOG_INFO, 0,
"PIM HELLO received: neighbor %s going down",
inet6_fmt(&src->sin6_addr));
delete_pim6_nbr(nbr);
return(TRUE);
}
/* Set the timer */
nbr->timer = holdtime;
return(TRUE);
}
else
/*
* No entry for this neighbor. Exit the loop and create an
* entry for it.
*/
break;
}
/*
* This is a new neighbor. Create a new entry for it.
* It must be added right after `prev_nbr`
*/
new_nbr = (pim_nbr_entry_t *)malloc(sizeof(pim_nbr_entry_t));
new_nbr->address = *src;
new_nbr->vifi = mifi;
new_nbr->timer = holdtime;
new_nbr->next = nbr;
new_nbr->prev = prev_nbr;
if (prev_nbr != (pim_nbr_entry_t *)NULL)
prev_nbr->next = new_nbr;
else
v->uv_pim_neighbors = new_nbr;
if (new_nbr->next != (pim_nbr_entry_t *)NULL)
new_nbr->next->prev = new_nbr;
v->uv_flags &= ~VIFF_NONBRS;
v->uv_flags |= VIFF_PIM_NBR;
IF_SET(mifi, &nbr_mifs);
/* Elect a new DR */
if (inet6_lessthan(&v->uv_linklocal->pa_addr,
&v->uv_pim_neighbors->address)) {
/* The first address is the new potential remote
* DR address and it wins (is >) over the local address.
*/
v->uv_flags &= ~VIFF_DR;
v->uv_flags &= ~VIFF_QUERIER;
}
/*
* Since a new neighbour has come up, let it know your existence ASAP;
* compute a random value, and reset the value to the hello timer
* if it's smaller than the rest of the timer.
* XXX: not in the spec...
*/
random_delay = 1 + (random() % (long)(PIM_TIMER_HELLO_PERIOD - 1));
if (random_delay < v->uv_pim_hello_timer)
v->uv_pim_hello_timer = random_delay;
/* Update the source entries */
for (srcentry_ptr = srclist; srcentry_ptr != (srcentry_t *)NULL;
srcentry_ptr = srcentry_ptr_next) {
srcentry_ptr_next = srcentry_ptr->next;
if (srcentry_ptr->incoming == mifi)
continue;
for (mrtentry_ptr = srcentry_ptr->mrtlink;
mrtentry_ptr != (mrtentry_t *)NULL;
mrtentry_ptr = mrtentry_ptr->srcnext) {
if(!(IF_ISSET(mifi, &mrtentry_ptr->oifs))) {
state_change =
change_interfaces(mrtentry_ptr,
srcentry_ptr->incoming,
&mrtentry_ptr->pruned_oifs,
&mrtentry_ptr->leaves,
&mrtentry_ptr->asserted_oifs);
if(state_change == 1)
trigger_join_alert(mrtentry_ptr);
}
}
}
IF_DEBUG(DEBUG_PIM_HELLO)
dump_vifs(stderr); /* Show we got a new neighbor */
return(TRUE);
}
void
delete_pim6_nbr(nbr_delete)
pim_nbr_entry_t *nbr_delete;
{
srcentry_t *srcentry_ptr;
srcentry_t *srcentry_ptr_next;
mrtentry_t *mrtentry_ptr;
struct uvif *v;
int state_change;
v = &uvifs[nbr_delete->vifi];
/* Delete the entry from the pim_nbrs chain */
if (nbr_delete->prev != (pim_nbr_entry_t *)NULL)
nbr_delete->prev->next = nbr_delete->next;
else
v->uv_pim_neighbors = nbr_delete->next;
if (nbr_delete->next != (pim_nbr_entry_t *)NULL)
nbr_delete->next->prev = nbr_delete->prev;
if (v->uv_pim_neighbors == (pim_nbr_entry_t *)NULL) {
/* This was our last neighbor. */
v->uv_flags &= ~VIFF_PIM_NBR;
v->uv_flags |= (VIFF_NONBRS | VIFF_DR | VIFF_QUERIER);
IF_CLR(nbr_delete->vifi, &nbr_mifs);
}
else {
if (inet6_greaterthan(&v->uv_linklocal->pa_addr,
&v->uv_pim_neighbors->address)) {
/* The first address is the new potential remote
* DR address, but the local address is the winner.
*/
v->uv_flags |= VIFF_DR;
v->uv_flags |= VIFF_QUERIER;
}
}
/* Update the source entries:
* If the deleted nbr was my upstream, then reset incoming and
* update all (S,G) entries for sources reachable through it.
* If the deleted nbr was the last on a non-iif vif, then recalcuate
* outgoing interfaces.
*/
for (srcentry_ptr = srclist; srcentry_ptr != (srcentry_t *)NULL;
srcentry_ptr = srcentry_ptr_next) {
srcentry_ptr_next = srcentry_ptr->next;
/* The only time we don't need to scan all mrtentries is
* when the nbr was on the iif, but not the upstream nbr!
*/
if (nbr_delete->vifi == srcentry_ptr->incoming &&
srcentry_ptr->upstream != nbr_delete)
continue;
/* Reset the next hop (PIM) router */
if(srcentry_ptr->upstream == nbr_delete)
if (set_incoming(srcentry_ptr, PIM_IIF_SOURCE) == FALSE) {
/*
* Couldn't reset it. Sorry, the next hop router
* toward that source is probably not
* a PIM router, or cannot find route at all,
* hence I cannot handle this source and have to
* delete it.
*/
delete_srcentry(srcentry_ptr);
free((char *)nbr_delete);
return;
}
for (mrtentry_ptr = srcentry_ptr->mrtlink;
mrtentry_ptr != (mrtentry_t *)NULL;
mrtentry_ptr = mrtentry_ptr->srcnext) {
mrtentry_ptr->incoming = srcentry_ptr->incoming;
mrtentry_ptr->upstream = srcentry_ptr->upstream;
mrtentry_ptr->metric = srcentry_ptr->metric;
mrtentry_ptr->preference = srcentry_ptr->preference;
state_change =
change_interfaces(mrtentry_ptr,
srcentry_ptr->incoming,
&mrtentry_ptr->pruned_oifs,
&mrtentry_ptr->leaves,
&mrtentry_ptr->asserted_oifs);
if(state_change == -1) {
trigger_prune_alert(mrtentry_ptr);
} else if(state_change == 1) {
trigger_join_alert(mrtentry_ptr);
}
}
}
free((char *)nbr_delete);
}
/* TODO: simplify it! */
static int
parse_pim6_hello(pim_message, datalen, src, holdtime)
char *pim_message;
int datalen;
struct sockaddr_in6 *src;
u_int16 *holdtime;
{
u_int8 *pim_hello_message;
u_int8 *data_ptr;
u_int16 option_type;
u_int16 option_length;
int holdtime_received_ok = FALSE;
int option_total_length;
pim_hello_message = (u_int8 *)(pim_message + sizeof(struct pim));
datalen -= sizeof(struct pim);
for ( ; datalen >= sizeof(pim_hello_t); ) {
/* Ignore any data if shorter than (pim_hello header) */
data_ptr = pim_hello_message;
GET_HOSTSHORT(option_type, data_ptr);
GET_HOSTSHORT(option_length, data_ptr);
switch (option_type) {
case PIM_MESSAGE_HELLO_HOLDTIME:
if (PIM_MESSAGE_HELLO_HOLDTIME_LENGTH != option_length) {
IF_DEBUG(DEBUG_PIM_HELLO)
log(LOG_DEBUG, 0,
"PIM HELLO Holdtime from %s: "
"invalid OptionLength = %u",
inet6_fmt(&src->sin6_addr),
option_length);
return (FALSE);
}
GET_HOSTSHORT(*holdtime, data_ptr);
holdtime_received_ok = TRUE;
break;
default:
/* Ignore any unknown options */
break;
}
/* Move to the next option */
/* XXX: TODO: If we are padding to the end of the 32 bit boundary,
* use the first method to move to the next option, otherwise
* simply (sizeof(pim_hello_t) + option_length).
*/
#ifdef BOUNDARY_32_BIT
option_total_length = (sizeof(pim_hello_t) + (option_length & ~0x3) +
((option_length & 0x3) ? 4 : 0));
#else
option_total_length = (sizeof(pim_hello_t) + option_length);
#endif /* BOUNDARY_32_BIT */
datalen -= option_total_length;
pim_hello_message += option_total_length;
}
return (holdtime_received_ok);
}
int
send_pim6_hello(v, holdtime)
struct uvif *v;
u_int16 holdtime;
{
char *buf;
u_int8 *data_ptr;
int datalen;
buf = pim6_send_buf + sizeof(struct pim);
data_ptr = (u_int8 *)buf;
PUT_HOSTSHORT(PIM_MESSAGE_HELLO_HOLDTIME, data_ptr);
PUT_HOSTSHORT(PIM_MESSAGE_HELLO_HOLDTIME_LENGTH, data_ptr);
PUT_HOSTSHORT(holdtime, data_ptr);
datalen = data_ptr - (u_int8 *)buf;
send_pim6(pim6_send_buf, &v->uv_linklocal->pa_addr,
&allpim6routers_group, PIM_HELLO, datalen);
v->uv_pim_hello_timer = PIM_TIMER_HELLO_PERIOD;
return(TRUE);
}
/************************************************************************
* PIM_JOIN_PRUNE
************************************************************************/
typedef struct {
struct sockaddr_in6 source;
struct sockaddr_in6 group;
struct sockaddr_in6 target;
} join_delay_cbk_t;
typedef struct {
mifi_t mifi;
struct sockaddr_in6 source;
struct sockaddr_in6 group;
u_int16 holdtime;
} prune_delay_cbk_t;
static void
delayed_join_job(arg)
void *arg;
{
mrtentry_t *mrtentry_ptr;
join_delay_cbk_t *cbk = (join_delay_cbk_t *)arg;
mrtentry_ptr = find_route(&cbk->source, &cbk->group,
MRTF_SG, DONT_CREATE);
if(mrtentry_ptr == (mrtentry_t *)NULL)
return;
if(mrtentry_ptr->join_delay_timerid)
timer_clearTimer(mrtentry_ptr->join_delay_timerid);
if(mrtentry_ptr->upstream)
send_pim6_jp(mrtentry_ptr, PIM_ACTION_JOIN,
mrtentry_ptr->incoming,
&mrtentry_ptr->upstream->address, 0, 0);
free(cbk);
}
static void
schedule_delayed_join(mrtentry_ptr, target)
mrtentry_t *mrtentry_ptr;
struct sockaddr_in6 *target;
{
u_long random_delay;
join_delay_cbk_t *cbk;
/* Delete existing timer */
if(mrtentry_ptr->join_delay_timerid)
timer_clearTimer(mrtentry_ptr->join_delay_timerid);
#ifdef SYSV
random_delay = lrand48() % (long)PIM_RANDOM_DELAY_JOIN_TIMEOUT;
#else
random_delay = random() % (long)PIM_RANDOM_DELAY_JOIN_TIMEOUT;
#endif
IF_DEBUG(DEBUG_PIM_JOIN_PRUNE)
log(LOG_DEBUG, 0, "Scheduling join for src %s, grp %s, delay %d",
inet6_fmt(&mrtentry_ptr->source->address.sin6_addr),
inet6_fmt(&mrtentry_ptr->group->group.sin6_addr),
random_delay);
if(random_delay == 0 && mrtentry_ptr->upstream) {
send_pim6_jp(mrtentry_ptr, PIM_ACTION_JOIN,
mrtentry_ptr->incoming,
&mrtentry_ptr->upstream->address, 0, 0);
return;
}
cbk = (join_delay_cbk_t *)malloc(sizeof(join_delay_cbk_t));
cbk->source = mrtentry_ptr->source->address;
cbk->group = mrtentry_ptr->group->group;
cbk->target = *target;
mrtentry_ptr->join_delay_timerid =
timer_setTimer(random_delay, delayed_join_job, cbk);
}
static void
delayed_prune_job(arg)
void *arg;
{
mrtentry_t *mrtentry_ptr;
if_set new_pruned_oifs;
int state_change;
prune_delay_cbk_t *cbk = (prune_delay_cbk_t *)arg;
mrtentry_ptr = find_route(&cbk->source, &cbk->group,
MRTF_SG, DONT_CREATE);
if(mrtentry_ptr == (mrtentry_t *)NULL)
return;
if(mrtentry_ptr->prune_delay_timerids[cbk->mifi])
timer_clearTimer(mrtentry_ptr->prune_delay_timerids[cbk->mifi]);
if(IF_ISSET(cbk->mifi, &mrtentry_ptr->oifs)) {
IF_DEBUG(DEBUG_PIM_JOIN_PRUNE)
log(LOG_DEBUG, 0,
"Deleting pruned mif %d for src %s, grp %s",
cbk->mifi,
inet6_fmt(&cbk->source.sin6_addr),
inet6_fmt(&cbk->group.sin6_addr));
IF_COPY(&mrtentry_ptr->pruned_oifs, &new_pruned_oifs);
IF_SET(cbk->mifi, &new_pruned_oifs);
SET_TIMER(mrtentry_ptr->prune_timers[cbk->mifi], cbk->holdtime);
state_change =
change_interfaces(mrtentry_ptr,
mrtentry_ptr->incoming,
&new_pruned_oifs,
&mrtentry_ptr->leaves,
&mrtentry_ptr->asserted_oifs);
/* Handle transition to negative cache */
if(state_change == -1)
trigger_prune_alert(mrtentry_ptr);
}
free(cbk);
}
static void
schedule_delayed_prune(mrtentry_ptr, mifi, holdtime)
mrtentry_t *mrtentry_ptr;
mifi_t mifi;
u_int16 holdtime;
{
prune_delay_cbk_t *cbk;
/* Delete existing timer */
if(mrtentry_ptr->prune_delay_timerids[mifi])
timer_clearTimer(mrtentry_ptr->prune_delay_timerids[mifi]);
cbk = (prune_delay_cbk_t *)malloc(sizeof(prune_delay_cbk_t));
cbk->mifi = mifi;
cbk->source = mrtentry_ptr->source->address;
cbk->group = mrtentry_ptr->group->group;
cbk->holdtime = holdtime;
mrtentry_ptr->prune_delay_timerids[mifi] =
timer_setTimer((u_int16)PIM_RANDOM_DELAY_JOIN_TIMEOUT,
delayed_prune_job, cbk);
}
/* TODO: when parsing, check if we go beyong message size */
int
receive_pim6_join_prune(src, pim_message, datalen)
struct sockaddr_in6 *src;
char *pim_message;
register int datalen;
{
mifi_t mifi;
struct uvif *v;
pim6_encod_uni_addr_t uni_target_addr;
pim6_encod_grp_addr_t encod_group;
pim6_encod_src_addr_t encod_src;
u_int8 *data_ptr;
u_int8 num_groups;
u_int16 holdtime;
u_int16 num_j_srcs, num_p_srcs;
struct sockaddr_in6 source, group, target;
struct in6_addr s_mask, g_mask;
u_int8 s_flags;
u_int8 reserved;
mrtentry_t *mrtentry_ptr;
pim_nbr_entry_t *upstream_router;
if_set new_pruned_oifs;
int state_change;
if ((mifi = find_vif_direct(src)) == NO_VIF) {
/*
* Either a local vif or somehow received PIM_JOIN_PRUNE from
* non-directly connected router. Ignore it.
*/
if (local_address(src) == NO_VIF)
log(LOG_INFO, 0,
"Ignoring PIM_JOIN_PRUNE from non-neighbor router %s",
inet6_fmt(&src->sin6_addr));
return(FALSE);
}
v = &uvifs[mifi];
if (uvifs[mifi].uv_flags & (VIFF_DOWN | VIFF_DISABLED | VIFF_NONBRS))
return(FALSE); /* Shoudn't come on this interface */
data_ptr = (u_int8 *)(pim_message + sizeof(struct pim));
/* Get the target address */
GET_EUADDR6(&uni_target_addr, data_ptr);
GET_BYTE(reserved, data_ptr);
GET_BYTE(num_groups, data_ptr);
if (num_groups == 0)
return (FALSE); /* No indication for groups in the message */
GET_HOSTSHORT(holdtime, data_ptr);
target.sin6_len = sizeof(target);
target.sin6_family = AF_INET6;
target.sin6_addr = uni_target_addr.unicast_addr;
target.sin6_scope_id = inet6_uvif2scopeid(&target, v);
IF_DEBUG(DEBUG_PIM_JOIN_PRUNE)
log(LOG_DEBUG, 0,
"PIM Join/Prune received from %s : target %s, holdtime %d",
inet6_fmt(&src->sin6_addr),
inet6_fmt(&target.sin6_addr),
holdtime);
if (!inet6_localif_address(&target, v) &&
!IN6_IS_ADDR_UNSPECIFIED(&uni_target_addr.unicast_addr)) {
/* if I am not the target of the join or prune message */
/*
* Join Suppression: when receiving a join not addressed to me,
* if I am delaying a join for this (S,G) then cancel the delayed
* join.
* Prune Soliticiting Joins: when receiving a prune not
* addressed to me on a LAN, schedule delayed join if I have
* downstream receivers.
*/
upstream_router = find_pim6_nbr(&target);
if (upstream_router == (pim_nbr_entry_t *)NULL)
return (FALSE); /* I have no such neighbor */
group.sin6_len = sizeof(group);
group.sin6_family = AF_INET6;
source.sin6_len = sizeof(source);
source.sin6_family = AF_INET6;
while (num_groups--) {
GET_EGADDR6(&encod_group, data_ptr);
GET_HOSTSHORT(num_j_srcs, data_ptr);
GET_HOSTSHORT(num_p_srcs, data_ptr);
if (encod_group.masklen > (sizeof(struct in6_addr) << 3))
continue;
MASKLEN_TO_MASK6(encod_group.masklen, g_mask);
group.sin6_addr = encod_group.mcast_addr;
group.sin6_scope_id = inet6_uvif2scopeid(&group, v);
if (!IN6_IS_ADDR_MULTICAST(&group.sin6_addr)) {
data_ptr +=
(num_j_srcs + num_p_srcs) * sizeof(pim6_encod_src_addr_t);
continue; /* Ignore this group and jump to the next */
}
while (num_j_srcs--) {
GET_ESADDR6(&encod_src, data_ptr);
source.sin6_addr = encod_src.src_addr;
source.sin6_scope_id = inet6_uvif2scopeid(&source,
v);
/* sanity checks */
if (!inet6_valid_host(&source))
continue;
if (encod_src.masklen >
(sizeof(struct in6_addr) << 3))
continue;
s_flags = encod_src.flags;
MASKLEN_TO_MASK6(encod_src.masklen, s_mask);
/* (S,G) Join suppresion */
mrtentry_ptr = find_route(&source, &group,
MRTF_SG, DONT_CREATE);
if(mrtentry_ptr == (mrtentry_t *)NULL)
continue;
IF_DEBUG(DEBUG_PIM_JOIN_PRUNE)
log(LOG_DEBUG, 0,
"\tJOIN src %s, group %s - canceling "
"delayed join",
inet6_fmt(&source.sin6_addr),
inet6_fmt(&group.sin6_addr));
/* Cancel the delayed join */
if(mrtentry_ptr->join_delay_timerid) {
timer_clearTimer(mrtentry_ptr->join_delay_timerid);
mrtentry_ptr->join_delay_timerid = 0;
}
}
while (num_p_srcs--) {
GET_ESADDR6(&encod_src, data_ptr);
source.sin6_addr = encod_src.src_addr;
source.sin6_scope_id = inet6_uvif2scopeid(&source,
v);
/* sanity checks */
if (!inet6_valid_host(&source))
continue;
if (encod_src.masklen >
(sizeof(struct in6_addr) << 3))
continue;
s_flags = encod_src.flags;
/* if P2P link (not addressed to me) ignore
*/
if(uvifs[mifi].uv_flags & VIFF_POINT_TO_POINT)
continue;
/*
* if non-null oiflist then schedule delayed join.
*/
mrtentry_ptr = find_route(&source, &group,
MRTF_SG, DONT_CREATE);
if(mrtentry_ptr == (mrtentry_t *)NULL)
continue;
if(!(IF_ISEMPTY(&mrtentry_ptr->oifs))) {
IF_DEBUG(DEBUG_PIM_JOIN_PRUNE)
log(LOG_DEBUG, 0,
"\tPRUNE src %s, group %s "
"- scheduling delayed join",
inet6_fmt(&source.sin6_addr),
inet6_fmt(&group.sin6_addr));
schedule_delayed_join(mrtentry_ptr,
&target);
}
}
} /* while groups */
return(TRUE);
} /* if not unicast target */
/* I am the target of this join/prune:
* For joins, cancel delayed prunes that I have scheduled.
* For prunes, echo the prune and schedule delayed prunes on LAN or
* prune immediately on point-to-point links.
*/
else {
while (num_groups--) {
GET_EGADDR6(&encod_group, data_ptr);
GET_HOSTSHORT(num_j_srcs, data_ptr);
GET_HOSTSHORT(num_p_srcs, data_ptr);
IF_DEBUG(DEBUG_PIM_JOIN_PRUNE)
log(LOG_DEBUG, 0,
"PIM Join/Prune received: grp: %s plen: %d, "
"%d jsrc, %d psrc",
inet6_fmt(&encod_group.mcast_addr),
encod_group.masklen, num_j_srcs, num_p_srcs);
if (encod_group.masklen > (sizeof(struct in6_addr) << 3))
continue; /* Ignore this group */
MASKLEN_TO_MASK6(encod_group.masklen, g_mask);
group.sin6_addr = encod_group.mcast_addr;
group.sin6_scope_id = inet6_uvif2scopeid(&group, v);
if (!IN6_IS_ADDR_MULTICAST(&group.sin6_addr)) {
data_ptr +=
(num_j_srcs + num_p_srcs) * sizeof(pim6_encod_src_addr_t);
continue; /* Ignore this group and jump to the next */
}
while (num_j_srcs--) {
GET_ESADDR6(&encod_src, data_ptr);
source.sin6_addr = encod_src.src_addr;
source.sin6_scope_id = inet6_uvif2scopeid(&source,
v);
if (!inet6_valid_host(&source))
continue;
if (encod_src.masklen >
(sizeof(struct in6_addr) << 3))
continue;
s_flags = encod_src.flags;
MASKLEN_TO_MASK6(encod_src.masklen, s_mask);
mrtentry_ptr = find_route(&source, &group,
MRTF_SG, DONT_CREATE);
if(mrtentry_ptr == (mrtentry_t *)NULL)
continue;
IF_DEBUG(DEBUG_PIM_JOIN_PRUNE)
log(LOG_DEBUG, 0,
"\tJOIN src %s, group %s - canceling "
"delayed prune",
inet6_fmt(&source.sin6_addr),
inet6_fmt(&group.sin6_addr));
/* Cancel the delayed prune */
if(mrtentry_ptr->prune_delay_timerids[mifi]) {
timer_clearTimer(mrtentry_ptr->prune_delay_timerids[mifi]);
mrtentry_ptr->prune_delay_timerids[mifi] = 0;
}
}
while (num_p_srcs--) {
GET_ESADDR6(&encod_src, data_ptr);
source.sin6_addr = encod_src.src_addr;
source.sin6_scope_id = inet6_uvif2scopeid(&source,
v);
if (!inet6_valid_host(&source))
continue;
s_flags = encod_src.flags;
mrtentry_ptr = find_route(&source, &group,
MRTF_SG, DONT_CREATE);
if(mrtentry_ptr == (mrtentry_t *)NULL)
continue;
/* if P2P link (addressed to me) prune immediately
*/
if(uvifs[mifi].uv_flags & VIFF_POINT_TO_POINT) {
if(IF_ISSET(mifi, &mrtentry_ptr->oifs)) {
IF_DEBUG(DEBUG_PIM_JOIN_PRUNE)
log(LOG_DEBUG, 0,
"\tPRUNE(P2P) src %s,"
"group %s - pruning "
"mif",
inet6_fmt(&source.sin6_addr),
inet6_fmt(&group.sin6_addr));
IF_DEBUG(DEBUG_MRT)
log(LOG_DEBUG, 0, "Deleting pruned mif %d for src %s, grp %s",
mifi,
inet6_fmt(&source.sin6_addr),
inet6_fmt(&group.sin6_addr));
IF_COPY(&mrtentry_ptr->pruned_oifs, &new_pruned_oifs);
IF_SET(mifi, &new_pruned_oifs);
SET_TIMER(mrtentry_ptr->prune_timers[mifi], holdtime);
state_change =
change_interfaces(mrtentry_ptr,
mrtentry_ptr->incoming,
&new_pruned_oifs,
&mrtentry_ptr->leaves,
&mrtentry_ptr->asserted_oifs);
/* Handle transition to negative cache */
if(state_change == -1)
trigger_prune_alert(mrtentry_ptr);
} /* if is pruned */
} /* if p2p */
/* if LAN link, echo the prune and schedule delayed
* oif deletion
*/
else {
IF_DEBUG(DEBUG_PIM_JOIN_PRUNE)
log(LOG_DEBUG, 0,
"\tPRUNE(LAN) src %s, group "
"%s - scheduling delayed prune",
inet6_fmt(&source.sin6_addr),
inet6_fmt(&group.sin6_addr));
send_pim6_jp(mrtentry_ptr,
PIM_ACTION_PRUNE, mifi,
&target, holdtime, 1);
schedule_delayed_prune(mrtentry_ptr,
mifi, holdtime);
}
}
} /* while groups */
} /* else I am unicast target */
return(TRUE);
}
int
send_pim6_jp(mrtentry_ptr, action, mifi, target_addr, holdtime, echo)
mrtentry_t *mrtentry_ptr;
int action; /* PIM_ACTION_JOIN or PIM_ACTION_PRUNE */
mifi_t mifi; /* vif to send join/prune on */
struct sockaddr_in6 *target_addr; /* encoded unicast target neighbor */
u_int16 holdtime; /* holdtime */
int echo;
{
u_int8 *data_ptr, *data_start_ptr;
data_ptr = (u_int8 *)(pim6_send_buf + sizeof(struct pim));
data_start_ptr = data_ptr;
if(echo == 0 && mrtentry_ptr->upstream == (pim_nbr_entry_t *)NULL) {
/* No upstream neighbor - don't send */
return(FALSE);
}
IF_DEBUG(DEBUG_PIM_JOIN_PRUNE)
log(LOG_DEBUG, 0,
"Sending %s: vif %s, src %s, group %s, "
"target %s, holdtime %d",
action==PIM_ACTION_JOIN ? "JOIN" : "PRUNE",
inet6_fmt(&uvifs[mifi].uv_linklocal->pa_addr.sin6_addr),
inet6_fmt(&mrtentry_ptr->source->address.sin6_addr),
inet6_fmt(&mrtentry_ptr->group->group.sin6_addr),
inet6_fmt(&target_addr->sin6_addr), holdtime);
PUT_EUADDR6(target_addr->sin6_addr, data_ptr); /* encoded unicast target addr */
PUT_BYTE(0, data_ptr); /* Reserved */
*data_ptr++ = (u_int8)1; /* number of groups */
PUT_HOSTSHORT(holdtime, data_ptr); /* holdtime */
/* data_ptr points at the first, and only encoded mcast group */
PUT_EGADDR6(mrtentry_ptr->group->group.sin6_addr,
SINGLE_GRP_MSK6LEN, 0, data_ptr);
/* set the number of join and prune sources */
if(action == PIM_ACTION_JOIN) {
PUT_HOSTSHORT(1, data_ptr);
PUT_HOSTSHORT(0, data_ptr);
} else if(action == PIM_ACTION_PRUNE) {
PUT_HOSTSHORT(0, data_ptr);
PUT_HOSTSHORT(1, data_ptr);
}
PUT_ESADDR6(mrtentry_ptr->source->address.sin6_addr, SINGLE_SRC_MSK6LEN,
0, data_ptr);
/* Cancel active graft */
if (echo == 0)
delete_pim6_graft_entry(mrtentry_ptr);
send_pim6(pim6_send_buf, &uvifs[mifi].uv_linklocal->pa_addr,
&allpim6routers_group, PIM_JOIN_PRUNE,
data_ptr - data_start_ptr);
return(TRUE);
}
/************************************************************************
* PIM_ASSERT
************************************************************************/
/* Notes on assert prefs/metrics
* - For downstream routers, compare pref/metric previously received from
* winner against those in message.
* ==> store assert winner's pref/metric in mrtentry
* - For upstream router compare my actualy pref/metric for the source
* against those received in message.
* ==> store my actual pref/metric in srcentry
*/
int
receive_pim6_assert(src, pim_message, datalen)
struct sockaddr_in6 *src;
register char *pim_message;
int datalen;
{
mifi_t mifi;
pim6_encod_uni_addr_t eusaddr;
pim6_encod_grp_addr_t egaddr;
struct sockaddr_in6 source, group;
mrtentry_t *mrtentry_ptr;
u_int8 *data_ptr;
struct uvif *v;
u_int32 assert_preference;
u_int32 assert_metric;
u_int32 local_metric;
u_int32 local_preference;
u_int8 local_wins;
if_set new_pruned_oifs, new_leaves;
int state_change;
if ((mifi = find_vif_direct(src)) == NO_VIF) {
/* Either a local vif or somehow received PIM_ASSERT from
* non-directly connected router. Ignore it.
*/
if (local_address(src) == NO_VIF)
log(LOG_INFO, 0,
"Ignoring PIM_ASSERT from non-neighbor router %s",
inet6_fmt(&src->sin6_addr));
return(FALSE);
}
v = &uvifs[mifi];
if (uvifs[mifi].uv_flags & (VIFF_DOWN | VIFF_DISABLED | VIFF_NONBRS))
return(FALSE); /* Shoudn't come on this interface */
data_ptr = (u_int8 *)(pim_message + sizeof(struct pim));
/* Get the group and source addresses */
GET_EGADDR6(&egaddr, data_ptr);
GET_EUADDR6(&eusaddr, data_ptr);
/* Get the metric related info */
GET_HOSTLONG(assert_preference, data_ptr);
GET_HOSTLONG(assert_metric, data_ptr);
source.sin6_addr = eusaddr.unicast_addr;
source.sin6_scope_id = inet6_uvif2scopeid(&source, v);
group.sin6_addr = egaddr.mcast_addr;
group.sin6_scope_id = inet6_uvif2scopeid(&group, v);
IF_DEBUG(DEBUG_PIM_ASSERT)
log(LOG_DEBUG, 0,
"PIM Assert received from %s: src %s, grp %s, "
"pref %d, metric %d",
inet6_fmt(&src->sin6_addr),
inet6_fmt(&source.sin6_addr),
inet6_fmt(&group.sin6_addr),
assert_preference, assert_metric);
if ((mrtentry_ptr = find_route(&source, &group, MRTF_SG, CREATE))
== NULL) {
IF_DEBUG(DEBUG_PIM_ASSERT)
log(LOG_INFO, 0,
"\tFailed to create a mrtentry src:%s grp:%s",
inet6_fmt(&source.sin6_addr),
inet6_fmt(&group.sin6_addr));
return(FALSE);
}
if(mrtentry_ptr->flags & MRTF_NEW) {
/* For some reason, it's possible for asserts to be processed
* before the data alerts a cache miss. Therefore, when an
* assert is received, create (S,G) state and continue, since
* we know by the assert that there are upstream forwarders.
*/
IF_DEBUG(DEBUG_PIM_ASSERT)
log(LOG_DEBUG, 0, "\tNo MRT entry - creating...");
mrtentry_ptr->flags &= ~MRTF_NEW;
/* Set oifs */
set_leaves(mrtentry_ptr);
calc_oifs(mrtentry_ptr, &(mrtentry_ptr->oifs));
/* Add it to the kernel */
k_chg_mfc(mld6_socket, &source, &group, mrtentry_ptr->incoming,
&mrtentry_ptr->oifs);
#ifdef RSRR
rsrr_cache_send(mrtentry_ptr, RSRR_NOTIFICATION_OK);
#endif /* RSRR */
/* No need to call change_interfaces, but check for NULL oiflist */
if(IF_ISEMPTY(&mrtentry_ptr->oifs))
trigger_prune_alert(mrtentry_ptr);
}
/* If arrived on iif, I'm downstream of the asserted LAN.
* If arrived on oif, I'm upstream of the asserted LAN.
*/
if (mifi == mrtentry_ptr->incoming) {
/* assert arrived on iif ==> I'm a downstream router */
/* Determine local (really that of upstream nbr!) pref/metric */
local_metric = mrtentry_ptr->metric;
local_preference = mrtentry_ptr->preference;
if(mrtentry_ptr->upstream &&
inet6_equal(&mrtentry_ptr->upstream->address, src) &&
assert_preference == local_preference &&
assert_metric == local_metric)
/* if assert from previous winner w/ same pref/metric,
* then assert sender wins again */
local_wins = FALSE;
else
/* assert from someone else or something changed */
local_wins = compare_metrics(local_preference,
local_metric,
&mrtentry_ptr->upstream->address,
assert_preference,
assert_metric, src);
/*
* This is between the assert sender and previous winner or rpf
* (who is the "local" in this case).
*/
if(local_wins == TRUE) {
/* the assert-sender loses, so discard the assert */
IF_DEBUG(DEBUG_PIM_ASSERT)
log(LOG_DEBUG, 0,
"\tAssert sender %s loses",
inet6_fmt(&src->sin6_addr));
return(TRUE);
}
/* The assert sender wins: upstream must be changed to the winner */
IF_DEBUG(DEBUG_PIM_ASSERT)
log(LOG_DEBUG, 0, "\tAssert sender %s wins",
inet6_fmt(&src->sin6_addr));
if(inet6_equal(&mrtentry_ptr->upstream->address, src)) {
IF_DEBUG(DEBUG_PIM_ASSERT)
log(LOG_DEBUG, 0,
"\tChanging upstream nbr to %s",
inet6_fmt(&src->sin6_addr));
mrtentry_ptr->preference = assert_preference;
mrtentry_ptr->metric = assert_metric;
mrtentry_ptr->upstream = find_pim6_nbr(src);
}
SET_TIMER(mrtentry_ptr->assert_timer, PIM_ASSERT_TIMEOUT);
mrtentry_ptr->flags |= MRTF_ASSERTED;
/* Send a join for the S,G if oiflist is non-empty */
if(!(IF_ISEMPTY(&mrtentry_ptr->oifs)))
send_pim6_jp(mrtentry_ptr, PIM_ACTION_JOIN,
mrtentry_ptr->incoming, src, 0, 0);
} /* if assert on iif */
/* If the assert arrived on an oif: */
else {
if(!(IF_ISSET(mifi, &mrtentry_ptr->oifs)))
return(FALSE);
/* assert arrived on oif ==> I'm a upstream router */
/* Determine local pref/metric */
local_metric = mrtentry_ptr->source->metric;
local_preference = mrtentry_ptr->source->preference;
local_wins = compare_metrics(local_preference, local_metric,
&v->uv_linklocal->pa_addr,
assert_preference,
assert_metric, src);
if(local_wins == FALSE) {
/* Assert sender wins - prune the interface */
IF_DEBUG(DEBUG_PIM_ASSERT)
log(LOG_DEBUG, 0,
"\tAssert sender %s wins - pruning...",
inet6_fmt(&src->sin6_addr));
IF_COPY(&mrtentry_ptr->pruned_oifs, &new_pruned_oifs);
IF_SET(mifi, &new_pruned_oifs);
IF_SET(mifi, &mrtentry_ptr->asserted_oifs);
SET_TIMER(mrtentry_ptr->prune_timers[mifi],
PIM_JOIN_PRUNE_HOLDTIME);
if (IF_ISSET(mifi, &mrtentry_ptr->leaves)) {
IF_COPY(&mrtentry_ptr->leaves, &new_leaves);
IF_CLR(mifi, &new_leaves);
state_change =
change_interfaces(mrtentry_ptr,
mrtentry_ptr->incoming,
&new_pruned_oifs,
&mrtentry_ptr->leaves,
&new_leaves);
}
else {
state_change =
change_interfaces(mrtentry_ptr,
mrtentry_ptr->incoming,
&new_pruned_oifs,
&mrtentry_ptr->leaves,
&mrtentry_ptr->asserted_oifs);
}
/* Handle transition to negative cache */
if(state_change == -1)
trigger_prune_alert(mrtentry_ptr);
} /* assert sender wins */
else {
/* Local wins (assert sender loses):
* send assert and schedule prune
*/
IF_DEBUG(DEBUG_PIM_ASSERT)
log(LOG_DEBUG, 0,
"\tAssert sender %s loses - "
"sending assert and scheuling prune",
inet6_fmt(&src->sin6_addr));
if(!(IF_ISSET(mifi, &mrtentry_ptr->leaves))) {
/*
* No directly connected receivers - delay prune
*/
send_pim6_jp(mrtentry_ptr, PIM_ACTION_PRUNE,
mifi, &v->uv_linklocal->pa_addr,
PIM_JOIN_PRUNE_HOLDTIME, 0);
schedule_delayed_prune(mrtentry_ptr, mifi,
PIM_JOIN_PRUNE_HOLDTIME);
}
send_pim6_assert(&source, &group, mifi, mrtentry_ptr);
}
} /* if assert on oif */
return(TRUE);
}
int
send_pim6_assert(source, group, mifi, mrtentry_ptr)
struct sockaddr_in6 *source;
struct sockaddr_in6 *group;
mifi_t mifi;
mrtentry_t *mrtentry_ptr;
{
u_int8 *data_ptr;
u_int8 *data_start_ptr;
u_int32 local_preference;
u_int32 local_metric;
data_ptr = (u_int8 *)(pim6_send_buf + sizeof(struct pim));
data_start_ptr = data_ptr;
PUT_EGADDR6(group->sin6_addr, SINGLE_GRP_MSK6LEN, 0, data_ptr);
PUT_EUADDR6(source->sin6_addr, data_ptr);
local_metric = mrtentry_ptr->source->metric;
local_preference = mrtentry_ptr->source->preference;
PUT_HOSTLONG(local_preference, data_ptr);
PUT_HOSTLONG(local_metric, data_ptr);
IF_DEBUG(DEBUG_PIM_ASSERT)
log(LOG_DEBUG, 0,
"PIM Assert sending: src %s, grp %s, "
"pref %d, metric %d",
inet6_fmt(&source->sin6_addr),
inet6_fmt(&group->sin6_addr),
local_metric, local_preference);
send_pim6(pim6_send_buf, &uvifs[mifi].uv_linklocal->pa_addr,
&allpim6routers_group, PIM_ASSERT,
data_ptr - data_start_ptr);
return(TRUE);
}
/* Return TRUE if the local win, otherwise FALSE */
static int
compare_metrics(local_preference, local_metric, local_address,
remote_preference, remote_metric, remote_address)
u_int32 local_preference;
u_int32 local_metric;
struct sockaddr_in6 *local_address;
u_int32 remote_preference;
u_int32 remote_metric;
struct sockaddr_in6 *remote_address;
{
/* Now lets see who has a smaller gun (aka "asserts war") */
/* FYI, the smaller gun...err metric wins, but if the same
* caliber, then the bigger network address wins. The order of
* treatment is: preference, metric, address.
*/
/* The RPT bits are already included as the most significant bits
* of the preferences.
*/
if (remote_preference > local_preference)
return TRUE;
if (remote_preference < local_preference)
return FALSE;
if (remote_metric > local_metric)
return TRUE;
if (remote_metric < local_metric)
return FALSE;
if (inet6_greaterthan(local_address, remote_address))
return TRUE;
return FALSE;
}
/************************************************************************
* PIM_GRAFT
************************************************************************/
u_long graft_retrans_timer; /* Graft retransmission timer */
pim_graft_entry_t *graft_list; /* Active grafting entries */
void
delete_pim6_graft_entry(mrtentry_ptr)
mrtentry_t *mrtentry_ptr;
{
pim_graft_entry_t *graft_entry;
if(mrtentry_ptr->graft == (pim_graft_entry_t *)NULL)
return;
graft_entry = mrtentry_ptr->graft;
if(graft_entry->prev)
graft_entry->prev->next = graft_entry->next;
else
graft_list = graft_entry->next;
if(graft_entry->next)
graft_entry->next->prev = graft_entry->prev;
mrtentry_ptr->graft = (pim_graft_entry_t *)NULL;
free(graft_entry);
/* Stop the timer if there are no more entries */
if(!graft_list) {
timer_clearTimer(graft_retrans_timer);
graft_retrans_timer = 0;
}
}
static int
retransmit_pim6_graft(mrtentry_ptr)
mrtentry_t *mrtentry_ptr;
{
u_int8 *data_ptr, *data_start_ptr;
data_ptr = (u_int8 *)(pim6_send_buf + sizeof(struct pim));
data_start_ptr = data_ptr;
if (mrtentry_ptr->upstream == (pim_nbr_entry_t *)NULL) {
/* No upstream neighbor - don't send */
return(FALSE);
}
IF_DEBUG(DEBUG_PIM_GRAFT)
log(LOG_DEBUG, 0,
"Sending GRAFT: vif %s, src %s, grp %s, dst %s",
inet6_fmt(&uvifs[mrtentry_ptr->incoming].uv_linklocal->pa_addr.sin6_addr),
inet6_fmt(&mrtentry_ptr->source->address.sin6_addr),
inet6_fmt(&mrtentry_ptr->group->group.sin6_addr),
inet6_fmt(&mrtentry_ptr->upstream->address.sin6_addr));
/* unicast target */
PUT_EUADDR6(mrtentry_ptr->upstream->address.sin6_addr, data_ptr);
PUT_BYTE(0, data_ptr); /* Reserved */
*data_ptr++ = (u_int8)1; /* number of groups */
PUT_HOSTSHORT(0, data_ptr); /* no holdtime */
/* data_ptr points at the first, and only encoded mcast group */
PUT_EGADDR6(mrtentry_ptr->group->group.sin6_addr,
SINGLE_GRP_MSK6LEN, 0, data_ptr);
/* set the number of join(graft) and prune sources */
PUT_HOSTSHORT(1, data_ptr);
PUT_HOSTSHORT(0, data_ptr);
PUT_ESADDR6(mrtentry_ptr->source->address.sin6_addr, SINGLE_SRC_MSK6LEN,
0, data_ptr);
send_pim6(pim6_send_buf,
&uvifs[mrtentry_ptr->incoming].uv_linklocal->pa_addr,
&mrtentry_ptr->upstream->address,
PIM_GRAFT, data_ptr - data_start_ptr);
return(TRUE);
}
static void
retransmit_all_pim6_grafts(arg)
void *arg; /* UNUSED */
{
pim_graft_entry_t *graft_ptr;
IF_DEBUG(DEBUG_PIM_GRAFT)
log(LOG_DEBUG, 0, "Retransmitting all pending PIM-Grafts");
for(graft_ptr = graft_list;
graft_ptr != NULL;
graft_ptr = graft_ptr->next) {
IF_DEBUG(DEBUG_PIM_GRAFT)
log(LOG_DEBUG, 0, "\tGRAFT src %s, grp %s",
inet6_fmt(&graft_ptr->mrtlink->source->address.sin6_addr),
inet6_fmt(&graft_ptr->mrtlink->group->group.sin6_addr));
retransmit_pim6_graft(graft_ptr->mrtlink);
}
if (graft_list)
timer_setTimer(PIM_GRAFT_RETRANS_PERIOD,
retransmit_all_pim6_grafts, (void *)NULL);
}
int
receive_pim6_graft(src, pim_message, datalen, pimtype)
struct sockaddr_in6 *src;
register char *pim_message;
int datalen;
int pimtype;
{
mifi_t mifi;
struct uvif *v;
pim6_encod_uni_addr_t uni_target_addr;
pim6_encod_grp_addr_t encod_group;
pim6_encod_src_addr_t encod_src;
u_int8 *data_ptr;
u_int8 num_groups;
u_int16 holdtime;
u_int16 num_j_srcs;
u_int16 num_p_srcs;
struct sockaddr_in6 source, group;
struct in6_addr s_mask, g_mask;
u_int8 s_flags;
u_int8 reserved;
mrtentry_t *mrtentry_ptr;
int state_change;
if ((mifi = find_vif_direct(src)) == NO_VIF) {
/* Either a local vif or somehow received PIM_GRAFT from
* non-directly connected router. Ignore it.
*/
if (local_address(src) == NO_VIF)
log(LOG_INFO, 0,
"Ignoring PIM_GRAFT from non-neighbor router %s",
inet6_fmt(&src->sin6_addr));
return(FALSE);
}
v = &uvifs[mifi];
if (uvifs[mifi].uv_flags & (VIFF_DOWN | VIFF_DISABLED | VIFF_NONBRS))
return(FALSE); /* Shoudn't come on this interface */
data_ptr = (u_int8 *)(pim_message + sizeof(struct pim));
/* Get the target address */
GET_EUADDR6(&uni_target_addr, data_ptr);
GET_BYTE(reserved, data_ptr);
GET_BYTE(num_groups, data_ptr);
if (num_groups == 0)
return (FALSE); /* No indication for groups in the message */
GET_HOSTSHORT(holdtime, data_ptr);
IF_DEBUG(DEBUG_PIM_GRAFT)
log(LOG_DEBUG, 0,
"PIM %s received from %s on mif %d, grps: %d",
pimtype == PIM_GRAFT ? "GRAFT" : "GRAFT-ACK",
inet6_fmt(&src->sin6_addr), mifi, num_groups);
group.sin6_len = sizeof(group);
group.sin6_family = AF_INET6;
source.sin6_len = sizeof(source);
source.sin6_family = AF_INET6;
while (num_groups--) {
GET_EGADDR6(&encod_group, data_ptr);
GET_HOSTSHORT(num_j_srcs, data_ptr);
GET_HOSTSHORT(num_p_srcs, data_ptr);
IF_DEBUG(DEBUG_PIM_GRAFT)
log(LOG_DEBUG, 0,
" PIM graft: grp: %s, plen: %d, %d jsrcs, %d psrcs",
inet6_fmt(&encod_group.mcast_addr),
encod_group.masklen, num_j_srcs, num_p_srcs);
if (encod_group.masklen > (sizeof(struct in6_addr) << 3))
continue;
MASKLEN_TO_MASK6(encod_group.masklen, g_mask);
group.sin6_addr = encod_group.mcast_addr;
group.sin6_scope_id = inet6_uvif2scopeid(&group, v);
if (!IN6_IS_ADDR_MULTICAST(&group.sin6_addr)) {
data_ptr +=
(num_j_srcs + num_p_srcs) * sizeof(pim6_encod_src_addr_t);
continue; /* Ignore this group and jump to the next */
}
while (num_j_srcs--) {
GET_ESADDR6(&encod_src, data_ptr);
if (encod_src.masklen > (sizeof(struct in6_addr) << 3))
continue;
source.sin6_addr = encod_src.src_addr;
source.sin6_scope_id = inet6_uvif2scopeid(&source, v);
if (!inet6_valid_host(&source))
continue;
s_flags = encod_src.flags;
MASKLEN_TO_MASK6(encod_src.masklen, s_mask);
mrtentry_ptr = find_route(&source, &group, MRTF_SG,
DONT_CREATE);
if(mrtentry_ptr == (mrtentry_t *)NULL)
continue;
if(pimtype == PIM_GRAFT) {
/* Graft */
IF_DEBUG(DEBUG_PIM_GRAFT)
log(LOG_DEBUG, 0,
"\tGRAFT src %s, group %s - "
"forward data on mif %d",
inet6_fmt(&source.sin6_addr),
inet6_fmt(&group.sin6_addr),
mifi);
/* Cancel any delayed prune */
if(mrtentry_ptr->prune_delay_timerids[mifi]) {
timer_clearTimer(mrtentry_ptr->prune_delay_timerids[mifi]);
mrtentry_ptr->prune_delay_timerids[mifi] = 0;
}
/* Add to oiflist (unprune) */
if (IF_ISSET(mifi, &mrtentry_ptr->pruned_oifs)) {
IF_CLR(mifi, &mrtentry_ptr->pruned_oifs);
IF_CLR(mifi, &mrtentry_ptr->asserted_oifs);
SET_TIMER(mrtentry_ptr->prune_timers[mifi], 0);
state_change =
change_interfaces(mrtentry_ptr,
mrtentry_ptr->incoming,
&mrtentry_ptr->pruned_oifs,
&mrtentry_ptr->leaves,
&mrtentry_ptr->asserted_oifs);
if(state_change == 1)
trigger_join_alert(mrtentry_ptr);
}
} /* Graft */
else {
/* Graft-Ack */
IF_DEBUG(DEBUG_PIM_GRAFT)
log(LOG_DEBUG, 0,
"\tGRAFT-ACK src %s, group %s - "
"forward data on mif %d",
inet6_fmt(&source.sin6_addr),
inet6_fmt(&group.sin6_addr),
mifi);
if(mrtentry_ptr->graft)
delete_pim6_graft_entry(mrtentry_ptr);
}
}
/* Ignore anything in the prune portion of the message! */
}
/* Respond to graft with a graft-ack */
if(pimtype == PIM_GRAFT) {
IF_DEBUG(DEBUG_PIM_GRAFT)
log(LOG_DEBUG, 0, "Sending GRAFT-ACK: mif %s, dst %s",
inet6_fmt(&uvifs[mifi].uv_linklocal->pa_addr.sin6_addr),
inet6_fmt(&src->sin6_addr));
bcopy(pim_message, pim6_send_buf, datalen);
send_pim6(pim6_send_buf, &uvifs[mifi].uv_linklocal->pa_addr,
src, PIM_GRAFT_ACK, datalen - sizeof(struct pim));
}
return(TRUE);
}
int
send_pim6_graft(mrtentry_ptr)
mrtentry_t *mrtentry_ptr;
{
pim_graft_entry_t *new_graft;
int was_sent = 0;
if(mrtentry_ptr->graft != (pim_graft_entry_t *)NULL)
/* Already sending grafts */
return(FALSE);
/* Send the first graft */
was_sent = retransmit_pim6_graft(mrtentry_ptr);
if(!was_sent)
return(FALSE);
/* Set up retransmission */
new_graft = (pim_graft_entry_t *)malloc(sizeof(pim_graft_entry_t));
if (new_graft == (pim_graft_entry_t *)NULL) {
log(LOG_WARNING, 0,
"Memory allocation error for graft entry src %s, grp %s",
inet6_fmt(&mrtentry_ptr->source->address.sin6_addr),
inet6_fmt(&mrtentry_ptr->group->group.sin6_addr));
return(FALSE);
}
new_graft->next = graft_list;
new_graft->prev = (pim_graft_entry_t *)NULL;
new_graft->mrtlink = mrtentry_ptr;
if(graft_list)
graft_list->prev = new_graft;
graft_list = new_graft;
mrtentry_ptr->graft = new_graft;
/* Set up timer if not running */
if(!graft_retrans_timer)
graft_retrans_timer = timer_setTimer(PIM_GRAFT_RETRANS_PERIOD,
retransmit_all_pim6_grafts,
(void *)NULL);
return(TRUE);
}
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