jimzah/freebsd-src
1
0
Fork 0
mirror of https://github.com/freebsd/freebsd-src.git synced 2024-12-03 12:38:58 +00:00
Code Issues Actions 2 Packages Projects Releases Wiki Activity
9bed6fe815
freebsd-src/usr.sbin/pim6dd/pim6_proto.c
Kris Kennaway b6f07be54a Sync with KAME. Format string auditing and manpage cleanups. 
Obtained from:	KAME
Submitted by:	Bill Sommerfeld <sommerfeld@netbsd.org>
2000-10-08 07:36:35 +00:00

1597 lines
47 KiB
C
Raw Blame History

/*
* 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 1.6 2000/10/05 22:20:38 itojun 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;
}
/*
* 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;
}
}
/* 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 %ld",
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);
}
Reference in New Issue View Git Blame Copy Permalink