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freebsd-dev/usr.sbin/pim6sd/rp.c
shin 927a0a3d01 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) 1999 LSIIT Laboratory.
* 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 Southern California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation in source and binary forms for lawful
* purposes and without fee is hereby granted, provided
* that the above copyright notice appear in all copies and that both
* the copyright notice and this permission notice appear in supporting
* documentation, and that any documentation, advertising materials,
* and other materials related to such distribution and use acknowledge
* that the software was developed by the University of Southern
* California and/or Information Sciences Institute.
* The name of the University of Southern California may not
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THE UNIVERSITY OF SOUTHERN CALIFORNIA DOES NOT MAKE ANY REPRESENTATIONS
* ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. THIS SOFTWARE IS
* PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND
* NON-INFRINGEMENT.
*
* IN NO EVENT SHALL USC, OR ANY OTHER CONTRIBUTOR BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
* TORT, OR OTHER FORM OF ACTION, ARISING OUT OF OR IN CONNECTION WITH,
* THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Other copyrights might apply to parts of this software and are so
* noted when applicable.
*
* $FreeBSD$
*/
/*
* Questions concerning this software should be directed to
* Mickael Hoerdt (hoerdt@clarinet.u-strasbg.fr) LSIIT Strasbourg.
*
*/
/*
* This program has been derived from pim6dd.
* The pim6dd program is covered by the license in the accompanying file
* named "LICENSE.pim6dd".
*/
/*
* This program has been derived from pimd.
* The pimd program is covered by the license in the accompanying file
* named "LICENSE.pimd".
*
*/
#include <stdlib.h>
#include <syslog.h>
#include "rp.h"
#include "pim6_proto.h"
#include "pimd.h"
#include <netinet6/pim6.h>
#include "timer.h"
#include "inet6.h"
#include "route.h"
#include "pimd.h"
#include "debug.h"
#include "crc.h"
/*
* The hash function. Stollen from Eddy's (eddy@isi.edu) implementation (for
* compatibility ;)
*/
#define SEED1 1103515245
#define SEED2 12345
#define RP_HASH_VALUE(G, M, C) (((SEED1) * (((SEED1) * ((G) & (M)) + (SEED2)) ^ (C)) + (SEED2)) % 0x80000000)
#define RP_HASH_VALUE2(P, C) (((SEED1) * (((SEED1) * (P) + (SEED2)) ^ (C)) + (SEED2)) % 0x80000000)
cand_rp_t *cand_rp_list;
grp_mask_t *grp_mask_list;
cand_rp_t *segmented_cand_rp_list;
grp_mask_t *segmented_grp_mask_list;
u_int16 curr_bsr_fragment_tag;
u_int8 curr_bsr_priority;
struct sockaddr_in6 curr_bsr_address;
struct in6_addr curr_bsr_hash_mask;
u_int16 pim_bootstrap_timer; /* For electing the BSR and sending
* Cand-RP-set msgs */
u_int8 my_bsr_priority;
struct sockaddr_in6 my_bsr_address;
struct in6_addr my_bsr_hash_mask;
u_int8 cand_bsr_flag = FALSE; /* Set to TRUE if I am a candidate
* BSR */
struct sockaddr_in6 my_cand_rp_address;
u_int8 my_cand_rp_priority;
u_int16 my_cand_rp_holdtime;
u_int16 my_cand_rp_adv_period; /* The locally configured Cand-RP
* adv. period. */
u_int16 my_bsr_period; /* The locally configured BSR
period */
u_int16 pim_cand_rp_adv_timer;
u_int8 cand_rp_flag = FALSE; /* Candidate RP flag */
struct cand_rp_adv_message_ cand_rp_adv_message;
struct in6_addr rp_my_ipv6_hashmask;
/*
* Local functions definition.
*/
static cand_rp_t *add_cand_rp __P((cand_rp_t **used_cand_rp_list ,
struct sockaddr_in6 *address));
static grp_mask_t *add_grp_mask __P((grp_mask_t ** used_grp_mask_list,
struct sockaddr_in6 *group_addr,
struct in6_addr group_mask,
struct in6_addr hash_mask));
static void delete_grp_mask_entry __P((cand_rp_t ** used_cand_rp_list,
grp_mask_t ** used_grp_mask_list,
grp_mask_t * grp_mask_delete));
static void delete_rp_entry __P((cand_rp_t ** used_cand_rp_list,
grp_mask_t ** used_grp_mask_list,
cand_rp_t * cand_rp_ptr));
void
init_rp6_and_bsr6()
{
/* TODO: if the grplist is not NULL, remap all groups ASAP! */
delete_rp_list(&cand_rp_list, &grp_mask_list);
delete_rp_list(&segmented_cand_rp_list, &segmented_grp_mask_list);
if (cand_bsr_flag == FALSE)
{
/*
* If I am not candidat BSR, initialize the "current BSR" as having
* the lowest priority.
*/
curr_bsr_fragment_tag = 0;
curr_bsr_priority = 0; /* Lowest priority */
curr_bsr_address = sockaddr6_any; /* Lowest priority */
MASKLEN_TO_MASK6(RP_DEFAULT_IPV6_HASHMASKLEN, curr_bsr_hash_mask);
SET_TIMER(pim_bootstrap_timer, PIM_BOOTSTRAP_TIMEOUT);
}
else
{
curr_bsr_fragment_tag = RANDOM();
curr_bsr_priority = my_bsr_priority;
curr_bsr_address = my_bsr_address;
curr_bsr_hash_mask = my_bsr_hash_mask;
SET_TIMER(pim_bootstrap_timer, bootstrap_initial_delay());
}
if (cand_rp_flag != FALSE)
{
MASKLEN_TO_MASK6(RP_DEFAULT_IPV6_HASHMASKLEN, rp_my_ipv6_hashmask);
/* Setup the Cand-RP-Adv-Timer */
SET_TIMER(pim_cand_rp_adv_timer, RANDOM() % my_cand_rp_adv_period);
}
}
/*
* XXX: This implementation is based on section 6.2 of RFC 2362, which
* is highly dependent on IPv4.
* We'll have to rewrite the function...
*/
u_int16
bootstrap_initial_delay()
{
// long AddrDelay;
// long Delay;
// long log_mask;
// int log_of_2;
// u_int8 bestPriority;
/*
* The bootstrap timer initial value (if Cand-BSR). It depends of the
* bootstrap router priority: higher priority has shorter value:
*
* Delay = 5 + 2*log_2(1 + bestPriority - myPriority) + AddrDelay;
*
* bestPriority = Max(storedPriority, myPriority); if (bestPriority ==
* myPriority) AddrDelay = log_2(bestAddr - myAddr)/16; else AddrDelay =
* 2 - (myAddr/2^31);
*/
// bestPriority = max(curr_bsr_priority, my_bsr_priority);
// if (bestPriority == my_bsr_priority)
// {
// AddrDelay = ntohl(curr_bsr_address) - ntohl(my_bsr_address);
/* Calculate the integer part of log_2 of (bestAddr - myAddr) */
/*
* To do so, have to find the position number of the first bit from
* left which is `1`
*/
// log_mask = sizeof(AddrDelay) << 3;
// log_mask = (1 << (log_mask - 1)); /* Set the leftmost bit to
// * `1` */
/* for (log_of_2 = (sizeof(AddrDelay) << 3) - 1; log_of_2; log_of_2--)
{
if (AddrDelay & log_mask)
break;
else
*/
// log_mask >>= 1; /* Start shifting `1` on right */
/* }
AddrDelay = log_of_2 / 16;
}
else
AddrDelay = 2 - (ntohl(my_bsr_address) / (1 << 31));
Delay = 1 + bestPriority - my_bsr_priority;
*/
/* Calculate log_2(Delay) */
// log_mask = sizeof(Delay) << 3;
// log_mask = (1 << (log_mask - 1));
/* Set the leftmost bit to `1`
*/
/* for (log_of_2 = (sizeof(Delay) << 3) - 1; log_of_2; log_of_2--)
{
if (Delay & log_mask)
break;
else
*/
// log_mask >>= 1; /* Start shifting `1` on right */
/* }
Delay = 5 + 2 * Delay + AddrDelay;
return (u_int16) Delay;
*/
/* Temporary implementation */
return (RANDOM()%my_bsr_period);
}
static cand_rp_t *
add_cand_rp(used_cand_rp_list, address)
cand_rp_t **used_cand_rp_list;
struct sockaddr_in6 *address;
{
cand_rp_t *cand_rp_prev = (cand_rp_t *) NULL;
cand_rp_t *cand_rp;
cand_rp_t *cand_rp_new;
rpentry_t *rpentry_ptr;
/* The ordering is the bigger first */
for (cand_rp = *used_cand_rp_list; cand_rp != (cand_rp_t *) NULL;
cand_rp_prev = cand_rp, cand_rp = cand_rp->next)
{
if (inet6_greaterthan(&cand_rp->rpentry->address, address))
continue;
if (inet6_equal(&cand_rp->rpentry->address , address))
return (cand_rp);
else
break;
}
/* Create and insert the new entry between cand_rp_prev and cand_rp */
cand_rp_new = (cand_rp_t *) malloc(sizeof(cand_rp_t));
cand_rp_new->rp_grp_next = (rp_grp_entry_t *) NULL;
cand_rp_new->next = cand_rp;
cand_rp_new->prev = cand_rp_prev;
if (cand_rp != (cand_rp_t *) NULL)
cand_rp->prev = cand_rp_new;
if (cand_rp_prev == (cand_rp_t *) NULL)
{
*used_cand_rp_list = cand_rp_new;
}
else
{
cand_rp_prev->next = cand_rp_new;
}
rpentry_ptr = (rpentry_t *) malloc(sizeof(rpentry_t));
cand_rp_new->rpentry = rpentry_ptr;
rpentry_ptr->next = (srcentry_t *) NULL;
rpentry_ptr->prev = (srcentry_t *) NULL;
rpentry_ptr->address = *address;
rpentry_ptr->mrtlink = (mrtentry_t *) NULL;
rpentry_ptr->incoming = NO_VIF;
rpentry_ptr->upstream = (pim_nbr_entry_t *) NULL;
/* TODO: setup the metric and the preference as ~0 (the lowest)? */
rpentry_ptr->metric = ~0;
rpentry_ptr->preference = ~0;
RESET_TIMER(rpentry_ptr->timer);
rpentry_ptr->cand_rp = cand_rp_new;
/*
* TODO: XXX: check whether there is a route to that RP: if return value
* is FALSE, then no route.
*/
if (local_address(&rpentry_ptr->address) == NO_VIF)
{
/* TODO: check for error and delete */
set_incoming(rpentry_ptr, PIM_IIF_RP);
}
else
{
/* TODO: XXX: CHECK!!! */
rpentry_ptr->incoming = reg_vif_num;
}
return (cand_rp_new);
}
static grp_mask_t *
add_grp_mask(used_grp_mask_list, group_addr, group_mask, hash_mask)
grp_mask_t **used_grp_mask_list;
struct sockaddr_in6 *group_addr;
struct in6_addr group_mask;
struct in6_addr hash_mask;
{
grp_mask_t *grp_mask_prev = (grp_mask_t *) NULL;
grp_mask_t *grp_mask;
grp_mask_t *grp_mask_tmp;
struct sockaddr_in6 prefix_h;
struct sockaddr_in6 prefix_h2;
int i;
/* I compare on the adresses, inet6_equal use the scope, too */
prefix_h.sin6_scope_id = prefix_h2.sin6_scope_id = 0;
for (i = 0; i < sizeof(struct in6_addr); i++)
prefix_h.sin6_addr.s6_addr[i] =
group_addr->sin6_addr.s6_addr[i] & group_mask.s6_addr[i];
/* The ordering is: smaller first */
for (grp_mask = *used_grp_mask_list; grp_mask != (grp_mask_t *) NULL;
grp_mask_prev = grp_mask, grp_mask = grp_mask->next)
{
for (i = 0; i < sizeof(struct in6_addr); i++)
prefix_h2.sin6_addr.s6_addr[i] =
(grp_mask->group_addr.sin6_addr.s6_addr[i] &
grp_mask->group_mask.s6_addr[i]);
if (inet6_lessthan(&prefix_h2, &prefix_h) )
continue;
if (inet6_equal(&prefix_h2, &prefix_h))
return (grp_mask);
else
break;
}
grp_mask_tmp = (grp_mask_t *) malloc(sizeof(grp_mask_t));
grp_mask_tmp->grp_rp_next = (rp_grp_entry_t *) NULL;
grp_mask_tmp->next = grp_mask;
grp_mask_tmp->prev = grp_mask_prev;
if (grp_mask != (grp_mask_t *) NULL)
grp_mask->prev = grp_mask_tmp;
if (grp_mask_prev == (grp_mask_t *) NULL)
{
*used_grp_mask_list = grp_mask_tmp;
}
else
{
grp_mask_prev->next = grp_mask_tmp;
}
grp_mask_tmp->group_addr = *group_addr;
grp_mask_tmp->group_mask = group_mask;
grp_mask_tmp->hash_mask = hash_mask;
grp_mask_tmp->group_rp_number = 0;
grp_mask_tmp->fragment_tag = 0;
return (grp_mask_tmp);
}
/*
* TODO: XXX: BUG: a remapping for some groups currently using some other
* grp_mask may be required by the addition of the new entry!!! Remapping all
* groups might be a costly process...
*/
rp_grp_entry_t *
add_rp_grp_entry(used_cand_rp_list, used_grp_mask_list,
rp_addr, rp_priority, rp_holdtime, group_addr, group_mask,
bsr_hash_mask,
fragment_tag)
cand_rp_t **used_cand_rp_list;
grp_mask_t **used_grp_mask_list;
struct sockaddr_in6 *rp_addr;
u_int8 rp_priority;
u_int16 rp_holdtime;
struct sockaddr_in6 *group_addr;
struct in6_addr group_mask;
struct in6_addr bsr_hash_mask;
u_int16 fragment_tag;
{
cand_rp_t *cand_rp_ptr;
grp_mask_t *grp_mask_ptr;
rpentry_t *rpentry_ptr;
rp_grp_entry_t *grp_rp_entry_next;
rp_grp_entry_t *grp_rp_entry_new;
rp_grp_entry_t *grp_rp_entry_prev = (rp_grp_entry_t *) NULL;
grpentry_t *grpentry_ptr_prev;
grpentry_t *grpentry_ptr_next;
u_int8 old_highest_priority = ~0; /* Smaller value means
* "higher" */
/* Input data verification */
if (!inet6_valid_host(rp_addr))
return (rp_grp_entry_t *) NULL;
if (!IN6_IS_ADDR_MULTICAST(&group_addr->sin6_addr))
{
return (rp_grp_entry_t *) NULL;
}
grp_mask_ptr = add_grp_mask(used_grp_mask_list, group_addr, group_mask,
bsr_hash_mask);
if (grp_mask_ptr == (grp_mask_t *) NULL)
return (rp_grp_entry_t *) NULL;
/* TODO: delete */
#if 0
if (grp_mask_ptr->grp_rp_next != (rp_grp_entry_t *) NULL)
{
/* Check for obsolete grp_rp chain */
if ((my_bsr_address != curr_bsr_address)
&& (grp_mask_ptr->grp_rp_next->fragment_tag != fragment_tag))
{
/* This grp_rp chain is obsolete. Delete it. */
delete_grp_mask(used_cand_rp_list, used_grp_mask_list,
group_addr, group_mask);
grp_mask_ptr = add_grp_mask(used_grp_mask_list, group_addr,
group_mask, bsr_hash_mask);
if (grp_mask_ptr == (grp_mask_t *) NULL)
return (rp_grp_entry_t *) NULL;
}
}
#endif /* 0 */
cand_rp_ptr = add_cand_rp(used_cand_rp_list, rp_addr);
if (cand_rp_ptr == (cand_rp_t *) NULL)
{
if (grp_mask_ptr->grp_rp_next == (rp_grp_entry_t *) NULL)
delete_grp_mask(used_cand_rp_list, used_grp_mask_list,
group_addr, group_mask);
return (rp_grp_entry_t *) NULL;
}
rpentry_ptr = cand_rp_ptr->rpentry;
SET_TIMER(rpentry_ptr->timer, rp_holdtime);
grp_mask_ptr->fragment_tag = fragment_tag; /* For garbage collection */
grp_rp_entry_prev = (rp_grp_entry_t *) NULL;
grp_rp_entry_next = grp_mask_ptr->grp_rp_next;
/* TODO: improve it */
if (grp_rp_entry_next != (rp_grp_entry_t *) NULL)
old_highest_priority = grp_rp_entry_next->priority;
for (; grp_rp_entry_next != (rp_grp_entry_t *) NULL;
grp_rp_entry_prev = grp_rp_entry_next,
grp_rp_entry_next = grp_rp_entry_next->grp_rp_next)
{
/*
* Smaller value means higher priority. The entries are sorted with
* the highest priority first.
*/
if (grp_rp_entry_next->priority < rp_priority)
continue;
if (grp_rp_entry_next->priority > rp_priority)
break;
/*
* Here we don't care about higher/lower addresses, because higher
* address does not guarantee higher hash_value, but anyway we do
* order with the higher address first, so it will be easier to find
* an existing entry and update the holdtime.
*/
if (inet6_greaterthan(&grp_rp_entry_next->rp->rpentry->address , rp_addr))
continue;
if (inet6_lessthan(&grp_rp_entry_next->rp->rpentry->address , rp_addr))
break;
/* We already have this entry. Update the holdtime */
/*
* TODO: We shoudn't have old existing entry, because with the
* current implementation all of them will be deleted (different
* fragment_tag). Debug and check and eventually delete.
*/
grp_rp_entry_next->holdtime = rp_holdtime;
grp_rp_entry_next->advholdtime = rp_holdtime;
grp_rp_entry_next->fragment_tag = fragment_tag;
return (grp_rp_entry_next);
}
/* Create and link the new entry */
grp_rp_entry_new = (rp_grp_entry_t *) malloc(sizeof(rp_grp_entry_t));
grp_rp_entry_new->grp_rp_next = grp_rp_entry_next;
grp_rp_entry_new->grp_rp_prev = grp_rp_entry_prev;
if (grp_rp_entry_next != (rp_grp_entry_t *) NULL)
grp_rp_entry_next->grp_rp_prev = grp_rp_entry_new;
if (grp_rp_entry_prev == (rp_grp_entry_t *) NULL)
grp_mask_ptr->grp_rp_next = grp_rp_entry_new;
else
grp_rp_entry_prev->grp_rp_next = grp_rp_entry_new;
/*
* The rp_grp_entry chain is not ordered, so just plug the new entry at
* the head.
*/
grp_rp_entry_new->rp_grp_next = cand_rp_ptr->rp_grp_next;
if (cand_rp_ptr->rp_grp_next != (rp_grp_entry_t *) NULL)
cand_rp_ptr->rp_grp_next->rp_grp_prev = grp_rp_entry_new;
grp_rp_entry_new->rp_grp_prev = (rp_grp_entry_t *) NULL;
cand_rp_ptr->rp_grp_next = grp_rp_entry_new;
grp_rp_entry_new->holdtime = rp_holdtime;
grp_rp_entry_new->advholdtime = rp_holdtime;
grp_rp_entry_new->fragment_tag = fragment_tag;
grp_rp_entry_new->priority = rp_priority;
grp_rp_entry_new->group = grp_mask_ptr;
grp_rp_entry_new->rp = cand_rp_ptr;
grp_rp_entry_new->grplink = (grpentry_t *) NULL;
grp_mask_ptr->group_rp_number++;
if (grp_mask_ptr->grp_rp_next->priority == rp_priority)
{
/* The first entries are with the best priority. */
/* Adding this rp_grp_entry may result in group_to_rp remapping */
for (grp_rp_entry_next = grp_mask_ptr->grp_rp_next;
grp_rp_entry_next != (rp_grp_entry_t *) NULL;
grp_rp_entry_next = grp_rp_entry_next->grp_rp_next)
{
if (grp_rp_entry_next->priority > old_highest_priority)
break;
for (grpentry_ptr_prev = grp_rp_entry_next->grplink;
grpentry_ptr_prev != (grpentry_t *) NULL;)
{
grpentry_ptr_next = grpentry_ptr_prev->rpnext;
remap_grpentry(grpentry_ptr_prev);
grpentry_ptr_prev = grpentry_ptr_next;
}
}
}
return (grp_rp_entry_new);
}
void
delete_rp_grp_entry(used_cand_rp_list, used_grp_mask_list,
rp_grp_entry_delete)
cand_rp_t **used_cand_rp_list;
grp_mask_t **used_grp_mask_list;
rp_grp_entry_t *rp_grp_entry_delete;
{
grpentry_t *grpentry_ptr;
grpentry_t *grpentry_ptr_next;
if (rp_grp_entry_delete == (rp_grp_entry_t *) NULL)
return;
rp_grp_entry_delete->group->group_rp_number--;
/* Free the rp_grp* and grp_rp* links */
if (rp_grp_entry_delete->rp_grp_prev != (rp_grp_entry_t *) NULL)
rp_grp_entry_delete->rp_grp_prev->rp_grp_next =
rp_grp_entry_delete->rp_grp_next;
else
rp_grp_entry_delete->rp->rp_grp_next =
rp_grp_entry_delete->rp_grp_next;
if (rp_grp_entry_delete->rp_grp_next != (rp_grp_entry_t *) NULL)
rp_grp_entry_delete->rp_grp_next->rp_grp_prev =
rp_grp_entry_delete->rp_grp_prev;
if (rp_grp_entry_delete->grp_rp_prev != (rp_grp_entry_t *) NULL)
rp_grp_entry_delete->grp_rp_prev->grp_rp_next =
rp_grp_entry_delete->grp_rp_next;
else
rp_grp_entry_delete->group->grp_rp_next =
rp_grp_entry_delete->grp_rp_next;
if (rp_grp_entry_delete->grp_rp_next != (rp_grp_entry_t *) NULL)
rp_grp_entry_delete->grp_rp_next->grp_rp_prev =
rp_grp_entry_delete->grp_rp_prev;
/* Delete Cand-RP or Group-prefix if useless */
if (rp_grp_entry_delete->group->grp_rp_next ==
(rp_grp_entry_t *) NULL)
delete_grp_mask_entry(used_cand_rp_list, used_grp_mask_list,
rp_grp_entry_delete->group);
if (rp_grp_entry_delete->rp->rp_grp_next ==
(rp_grp_entry_t *) NULL)
delete_rp_entry(used_cand_rp_list, used_grp_mask_list,
rp_grp_entry_delete->rp);
/* Remap all affected groups */
for (grpentry_ptr = rp_grp_entry_delete->grplink;
grpentry_ptr != (grpentry_t *) NULL;
grpentry_ptr = grpentry_ptr_next)
{
grpentry_ptr_next = grpentry_ptr->rpnext;
remap_grpentry(grpentry_ptr);
}
free((char *) rp_grp_entry_delete);
}
/*
* TODO: XXX: the affected group entries will be partially setup, because may
* have group routing entry, but NULL pointers to RP. After the call to this
* function, must remap all group entries ASAP.
*/
void
delete_rp_list(used_cand_rp_list, used_grp_mask_list)
cand_rp_t **used_cand_rp_list;
grp_mask_t **used_grp_mask_list;
{
cand_rp_t *cand_rp_ptr,
*cand_rp_next;
grp_mask_t *grp_mask_ptr,
*grp_mask_next;
rp_grp_entry_t *rp_grp_entry_ptr,
*rp_grp_entry_next;
grpentry_t *grpentry_ptr,
*grpentry_ptr_next;
for (cand_rp_ptr = *used_cand_rp_list;
cand_rp_ptr != (cand_rp_t *) NULL;)
{
cand_rp_next = cand_rp_ptr->next;
/* Free the mrtentry (if any) for this RP */
if (cand_rp_ptr->rpentry->mrtlink != (mrtentry_t *) NULL)
{
if (cand_rp_ptr->rpentry->mrtlink->flags & MRTF_KERNEL_CACHE)
delete_mrtentry_all_kernel_cache(cand_rp_ptr->rpentry->mrtlink);
FREE_MRTENTRY(cand_rp_ptr->rpentry->mrtlink);
}
free(cand_rp_ptr->rpentry);
/* Free the whole chain of rp_grp_entry for this RP */
for (rp_grp_entry_ptr = cand_rp_ptr->rp_grp_next;
rp_grp_entry_ptr != (rp_grp_entry_t *) NULL;
rp_grp_entry_ptr = rp_grp_entry_next)
{
rp_grp_entry_next = rp_grp_entry_ptr->rp_grp_next;
/* Clear the RP related invalid pointers for all group entries */
for (grpentry_ptr = rp_grp_entry_ptr->grplink;
grpentry_ptr != (grpentry_t *) NULL;
grpentry_ptr = grpentry_ptr_next)
{
grpentry_ptr_next = grpentry_ptr->rpnext;
grpentry_ptr->rpnext = (grpentry_t *) NULL;
grpentry_ptr->rpprev = (grpentry_t *) NULL;
grpentry_ptr->active_rp_grp = (rp_grp_entry_t *) NULL;
grpentry_ptr->rpaddr = sockaddr6_any;
}
free(rp_grp_entry_ptr);
}
cand_rp_ptr = cand_rp_next;
}
*used_cand_rp_list = (cand_rp_t *) NULL;
for (grp_mask_ptr = *used_grp_mask_list;
grp_mask_ptr != (grp_mask_t *) NULL;
grp_mask_ptr = grp_mask_next)
{
grp_mask_next = grp_mask_ptr->next;
free(grp_mask_ptr);
}
*used_grp_mask_list = (grp_mask_t *) NULL;
}
void
delete_grp_mask(used_cand_rp_list, used_grp_mask_list, group_addr, group_mask)
cand_rp_t **used_cand_rp_list;
grp_mask_t **used_grp_mask_list;
struct sockaddr_in6 *group_addr;
struct in6_addr group_mask;
{
grp_mask_t *grp_mask_ptr;
struct sockaddr_in6 prefix_h;
struct sockaddr_in6 prefix_h2;
int i;
for (i = 0; i < sizeof(struct in6_addr); i++)
prefix_h.sin6_addr.s6_addr[i] = group_addr->sin6_addr.s6_addr[i]&group_mask.s6_addr[i];
for (grp_mask_ptr = *used_grp_mask_list;
grp_mask_ptr != (grp_mask_t *) NULL;
grp_mask_ptr = grp_mask_ptr->next)
{
for (i = 0; i < sizeof(struct in6_addr); i++)
prefix_h2.sin6_addr.s6_addr[i] =
grp_mask_ptr->group_addr.sin6_addr.s6_addr[i]&grp_mask_ptr->group_mask.s6_addr[i];
if (inet6_lessthan(&prefix_h2, &prefix_h))
continue;
if (IN6_ARE_ADDR_EQUAL(&grp_mask_ptr->group_addr.sin6_addr,
&group_addr->sin6_addr) &&
IN6_ARE_ADDR_EQUAL(&grp_mask_ptr->group_mask, &group_mask))
break;
else
return; /* Not found */
}
if (grp_mask_ptr == (grp_mask_t *) NULL)
return; /* Not found */
delete_grp_mask_entry(used_cand_rp_list, used_grp_mask_list,
grp_mask_ptr);
}
static void
delete_grp_mask_entry(used_cand_rp_list, used_grp_mask_list, grp_mask_delete)
cand_rp_t **used_cand_rp_list;
grp_mask_t **used_grp_mask_list;
grp_mask_t *grp_mask_delete;
{
grpentry_t *grpentry_ptr,
*grpentry_ptr_next;
rp_grp_entry_t *grp_rp_entry_ptr;
rp_grp_entry_t *grp_rp_entry_next;
if (grp_mask_delete == (grp_mask_t *) NULL)
return;
/* Remove from the grp_mask_list first */
if (grp_mask_delete->prev != (grp_mask_t *) NULL)
grp_mask_delete->prev->next = grp_mask_delete->next;
else
*used_grp_mask_list = grp_mask_delete->next;
if (grp_mask_delete->next != (grp_mask_t *) NULL)
grp_mask_delete->next->prev = grp_mask_delete->prev;
/* Remove all grp_rp entries for this grp_mask */
for (grp_rp_entry_ptr = grp_mask_delete->grp_rp_next;
grp_rp_entry_ptr != (rp_grp_entry_t *) NULL;
grp_rp_entry_ptr = grp_rp_entry_next)
{
grp_rp_entry_next = grp_rp_entry_ptr->grp_rp_next;
/* Remap all related grpentry */
for (grpentry_ptr = grp_rp_entry_ptr->grplink;
grpentry_ptr != (grpentry_t *) NULL;
grpentry_ptr = grpentry_ptr_next)
{
grpentry_ptr_next = grpentry_ptr->rpnext;
remap_grpentry(grpentry_ptr);
}
if (grp_rp_entry_ptr->rp_grp_prev != (rp_grp_entry_t *) NULL)
{
grp_rp_entry_ptr->rp_grp_prev->rp_grp_next =
grp_rp_entry_ptr->rp_grp_next;
}
else
{
grp_rp_entry_ptr->rp->rp_grp_next = grp_rp_entry_ptr->rp_grp_next;
}
if (grp_rp_entry_ptr->rp_grp_next != (rp_grp_entry_t *) NULL)
grp_rp_entry_ptr->rp_grp_next->rp_grp_prev =
grp_rp_entry_ptr->rp_grp_prev;
if (grp_rp_entry_ptr->rp->rp_grp_next == (rp_grp_entry_t *) NULL)
{
/* Delete the RP entry */
delete_rp_entry(used_cand_rp_list, used_grp_mask_list,
grp_rp_entry_ptr->rp);
}
free(grp_rp_entry_ptr);
}
}
/*
* TODO: currently not used.
*/
void
delete_rp(used_cand_rp_list, used_grp_mask_list, rp_addr)
cand_rp_t **used_cand_rp_list;
grp_mask_t **used_grp_mask_list;
struct sockaddr_in6 *rp_addr;
{
cand_rp_t *cand_rp_ptr;
for (cand_rp_ptr = *used_cand_rp_list;
cand_rp_ptr != (cand_rp_t *) NULL;
cand_rp_ptr = cand_rp_ptr->next)
{
if (inet6_greaterthan(&cand_rp_ptr->rpentry->address, rp_addr))
continue;
if (inet6_equal(&cand_rp_ptr->rpentry->address,rp_addr))
break;
else
return; /* Not found */
}
if (cand_rp_ptr == (cand_rp_t *) NULL)
return; /* Not found */
delete_rp_entry(used_cand_rp_list, used_grp_mask_list, cand_rp_ptr);
}
static void
delete_rp_entry(used_cand_rp_list, used_grp_mask_list, cand_rp_delete)
cand_rp_t **used_cand_rp_list;
grp_mask_t **used_grp_mask_list;
cand_rp_t *cand_rp_delete;
{
rp_grp_entry_t *rp_grp_entry_ptr;
rp_grp_entry_t *rp_grp_entry_next;
grpentry_t *grpentry_ptr;
grpentry_t *grpentry_ptr_next;
if (cand_rp_delete == (cand_rp_t *) NULL)
return;
/* Remove from the cand-RP chain */
if (cand_rp_delete->prev != (cand_rp_t *) NULL)
cand_rp_delete->prev->next = cand_rp_delete->next;
else
*used_cand_rp_list = cand_rp_delete->next;
if (cand_rp_delete->next != (cand_rp_t *) NULL)
cand_rp_delete->next->prev = cand_rp_delete->prev;
if (cand_rp_delete->rpentry->mrtlink != (mrtentry_t *) NULL)
{
if (cand_rp_delete->rpentry->mrtlink->flags & MRTF_KERNEL_CACHE)
delete_mrtentry_all_kernel_cache(cand_rp_delete->rpentry->mrtlink);
FREE_MRTENTRY(cand_rp_delete->rpentry->mrtlink);
}
free((char *) cand_rp_delete->rpentry);
/* Remove all rp_grp entries for this RP */
for (rp_grp_entry_ptr = cand_rp_delete->rp_grp_next;
rp_grp_entry_ptr != (rp_grp_entry_t *) NULL;
rp_grp_entry_ptr = rp_grp_entry_next)
{
rp_grp_entry_next = rp_grp_entry_ptr->rp_grp_next;
rp_grp_entry_ptr->group->group_rp_number--;
/* First take care of the grp_rp chain */
if (rp_grp_entry_ptr->grp_rp_prev != (rp_grp_entry_t *) NULL)
{
rp_grp_entry_ptr->grp_rp_prev->grp_rp_next =
rp_grp_entry_ptr->grp_rp_next;
}
else
{
rp_grp_entry_ptr->group->grp_rp_next =
rp_grp_entry_ptr->grp_rp_next;
}
if (rp_grp_entry_ptr->grp_rp_next != (rp_grp_entry_t *) NULL)
{
rp_grp_entry_ptr->grp_rp_next->grp_rp_prev =
rp_grp_entry_ptr->grp_rp_prev;
}
if (rp_grp_entry_ptr->grp_rp_next == (rp_grp_entry_t *) NULL)
{
delete_grp_mask_entry(used_cand_rp_list, used_grp_mask_list,
rp_grp_entry_ptr->group);
}
/* Remap the related groups */
for (grpentry_ptr = rp_grp_entry_ptr->grplink;
grpentry_ptr != (grpentry_t *) NULL;
grpentry_ptr = grpentry_ptr_next)
{
grpentry_ptr_next = grpentry_ptr->rpnext;
remap_grpentry(grpentry_ptr);
}
free(rp_grp_entry_ptr);
}
free((char *) cand_rp_delete);
}
/*
* Rehash the RP for the group. XXX: currently, every time when
* remap_grpentry() is called, there has being a good reason to change the
* RP, so for performancy reasons no check is performed whether the RP will
* be really different one.
*/
int
remap_grpentry(grpentry_ptr)
grpentry_t *grpentry_ptr;
{
rpentry_t *rpentry_ptr;
rp_grp_entry_t *rp_grp_entry_ptr;
mrtentry_t *grp_route;
mrtentry_t *mrtentry_ptr;
if (grpentry_ptr == (grpentry_t *) NULL)
return (FALSE);
/* Remove from the list of all groups matching to the same RP */
if (grpentry_ptr->rpprev != (grpentry_t *) NULL)
grpentry_ptr->rpprev->rpnext = grpentry_ptr->rpnext;
else
{
if (grpentry_ptr->active_rp_grp != (rp_grp_entry_t *) NULL)
grpentry_ptr->active_rp_grp->grplink = grpentry_ptr->rpnext;
}
if (grpentry_ptr->rpnext != (grpentry_t *) NULL)
grpentry_ptr->rpnext->rpprev = grpentry_ptr->rpprev;
rp_grp_entry_ptr = rp_grp_match(&grpentry_ptr->group);
if (rp_grp_entry_ptr == (rp_grp_entry_t *) NULL)
{
/* If cannot remap, delete the group */
delete_grpentry(grpentry_ptr);
return (FALSE);
}
rpentry_ptr = rp_grp_entry_ptr->rp->rpentry;
/* Add to the new chain of all groups mapping to the same RP */
grpentry_ptr->rpaddr = rpentry_ptr->address;
grpentry_ptr->active_rp_grp = rp_grp_entry_ptr;
grpentry_ptr->rpnext = rp_grp_entry_ptr->grplink;
if (grpentry_ptr->rpnext != (grpentry_t *) NULL)
grpentry_ptr->rpnext->rpprev = grpentry_ptr;
grpentry_ptr->rpprev = (grpentry_t *) NULL;
rp_grp_entry_ptr->grplink = grpentry_ptr;
if ((grp_route = grpentry_ptr->grp_route) != (mrtentry_t *) NULL)
{
grp_route->upstream = rpentry_ptr->upstream;
grp_route->metric = rpentry_ptr->metric;
grp_route->preference = rpentry_ptr->preference;
change_interfaces(grp_route, rpentry_ptr->incoming,
&grp_route->joined_oifs,
&grp_route->pruned_oifs,
&grp_route->leaves,
&grp_route->asserted_oifs, MFC_UPDATE_FORCE);
}
for (mrtentry_ptr = grpentry_ptr->mrtlink;
mrtentry_ptr != (mrtentry_t *) NULL;
mrtentry_ptr = mrtentry_ptr->grpnext)
{
if (!(mrtentry_ptr->flags & MRTF_RP))
continue;
mrtentry_ptr->upstream = rpentry_ptr->upstream;
mrtentry_ptr->metric = rpentry_ptr->metric;
mrtentry_ptr->preference = rpentry_ptr->preference;
change_interfaces(mrtentry_ptr, rpentry_ptr->incoming,
&mrtentry_ptr->joined_oifs,
&mrtentry_ptr->pruned_oifs,
&mrtentry_ptr->leaves,
&mrtentry_ptr->asserted_oifs, MFC_UPDATE_FORCE);
}
return (TRUE);
}
rpentry_t *
rp_match(group)
struct sockaddr_in6 *group;
{
rp_grp_entry_t *rp_grp_entry_ptr;
rp_grp_entry_ptr = rp_grp_match(group);
if (rp_grp_entry_ptr != (rp_grp_entry_t *) NULL)
return (rp_grp_entry_ptr->rp->rpentry);
else
return (rpentry_t *) NULL;
}
rp_grp_entry_t *
rp_grp_match(group)
struct sockaddr_in6 *group;
{
grp_mask_t *grp_mask_ptr;
rp_grp_entry_t *grp_rp_entry_ptr;
rp_grp_entry_t *best_entry = (rp_grp_entry_t *) NULL;
u_int8 best_priority = ~0; /* Smaller is better */
u_int32 best_hash_value = 0; /* Bigger is better */
struct sockaddr_in6 best_address_h; /* Bigger is better */
u_int32 curr_hash_value = 0;
struct sockaddr_in6 curr_address_h;
struct sockaddr_in6 prefix_h;
struct sockaddr_in6 prefix_h2;
int i;
if (grp_mask_list == (grp_mask_t *) NULL)
return (rp_grp_entry_t *) NULL;
/* XXX :I compare on the adresses , inet6_equal use the scope too */
prefix_h.sin6_scope_id = prefix_h2.sin6_scope_id = 0;
for (grp_mask_ptr = grp_mask_list; grp_mask_ptr != (grp_mask_t *) NULL;
grp_mask_ptr = grp_mask_ptr->next)
{
for (i = 0; i < sizeof(struct in6_addr); i++)
prefix_h2.sin6_addr.s6_addr[i] =
(grp_mask_ptr->group_addr.sin6_addr.s6_addr[i] &
grp_mask_ptr->group_mask.s6_addr[i]);
for (i = 0; i < sizeof(struct in6_addr); i++)
prefix_h.sin6_addr.s6_addr[i] =
(group->sin6_addr.s6_addr[i] &
grp_mask_ptr->group_mask.s6_addr[i]);
/* Search the grp_mask (group_prefix) list */
if ((inet6_greaterthan(&prefix_h, &prefix_h2)))
continue;
if ((inet6_lessthan(&prefix_h, &prefix_h2)))
break;
for (grp_rp_entry_ptr = grp_mask_ptr->grp_rp_next;
grp_rp_entry_ptr != (rp_grp_entry_t *) NULL;
grp_rp_entry_ptr = grp_rp_entry_ptr->grp_rp_next)
{
if (best_priority < grp_rp_entry_ptr->priority)
break;
curr_address_h = grp_rp_entry_ptr->rp->rpentry->address;
#if 0
curr_hash_value = RP_HASH_VALUE(crc((char *)&group->sin6_addr,
sizeof(struct in6_addr)),
crc((char *)&grp_mask_ptr->hash_mask,
sizeof(struct in6_addr)),
crc((char *)&curr_address_h.sin6_addr,
sizeof(struct in6_addr)));
#else
{
struct in6_addr masked_grp;
int i;
for (i = 0; i < sizeof(struct in6_addr); i++)
masked_grp.s6_addr[i] =
group->sin6_addr.s6_addr[i] &
grp_mask_ptr->hash_mask.s6_addr[i];
curr_hash_value = RP_HASH_VALUE2(crc((char *)&masked_grp,
sizeof(struct in6_addr)),
crc((char *)&curr_address_h.sin6_addr,
sizeof(struct in6_addr)));
}
#endif
if (best_priority == grp_rp_entry_ptr->priority)
{
/* Compare the hash_value and then the addresses */
if (curr_hash_value < best_hash_value)
continue;
if (curr_hash_value == best_hash_value)
if (inet6_lessthan(&curr_address_h ,&best_address_h))
continue;
}
/* The current entry in the loop is preferred */
best_entry = grp_rp_entry_ptr;
best_priority = best_entry->priority;
best_address_h = curr_address_h;
best_hash_value = curr_hash_value;
}
}
if (best_entry == (rp_grp_entry_t *) NULL)
return (rp_grp_entry_t *) NULL;
IF_DEBUG(DEBUG_PIM_CAND_RP)
log(LOG_DEBUG,0,"Rp_grp_match found %s for group %s",
inet6_fmt(&best_entry->rp->rpentry->address.sin6_addr),
inet6_fmt(&group->sin6_addr));
return (best_entry);
}
rpentry_t *
rp_find(rp_address)
struct sockaddr_in6 *rp_address;
{
cand_rp_t *cand_rp_ptr;
for (cand_rp_ptr = cand_rp_list; cand_rp_ptr != (cand_rp_t *) NULL;
cand_rp_ptr = cand_rp_ptr->next)
{
if( inet6_greaterthan(&cand_rp_ptr->rpentry->address,rp_address))
continue;
if( inet6_equal(&cand_rp_ptr->rpentry->address,rp_address))
return (cand_rp_ptr->rpentry);
return (rpentry_t *) NULL;
}
return (rpentry_t *) NULL;
}
/*
* Create a bootstrap message in "send_buff" and returns the data size
* (excluding the IP header and the PIM header) Can be used both by the
* Bootstrap router to multicast the RP-set or by the DR to unicast it to a
* new neighbor. It DOES NOT change any timers.
*/
int
create_pim6_bootstrap_message(send_buff)
char *send_buff;
{
u_int8 *data_ptr;
grp_mask_t *grp_mask_ptr;
rp_grp_entry_t *grp_rp_entry_ptr;
int datalen;
u_int8 masklen=0;
if (IN6_IS_ADDR_UNSPECIFIED(&curr_bsr_address.sin6_addr))
return (0);
data_ptr = (u_int8 *) (send_buff + sizeof(struct pim));
if( inet6_equal(&curr_bsr_address , &my_bsr_address ))
curr_bsr_fragment_tag++;
PUT_HOSTSHORT(curr_bsr_fragment_tag, data_ptr);
MASK_TO_MASKLEN6(curr_bsr_hash_mask, masklen);
PUT_BYTE(masklen, data_ptr);
PUT_BYTE(curr_bsr_priority, data_ptr);
PUT_EUADDR6(curr_bsr_address.sin6_addr, data_ptr);
/* TODO: XXX: No fragmentation support (yet) */
for (grp_mask_ptr = grp_mask_list; grp_mask_ptr != (grp_mask_t *) NULL;
grp_mask_ptr = grp_mask_ptr->next)
{
MASK_TO_MASKLEN6(grp_mask_ptr->group_mask, masklen);
PUT_EGADDR6(grp_mask_ptr->group_addr.sin6_addr, masklen, 0, data_ptr);
PUT_BYTE(grp_mask_ptr->group_rp_number, data_ptr);
PUT_BYTE(grp_mask_ptr->group_rp_number, data_ptr); /* TODO: if frag. */
PUT_HOSTSHORT(0, data_ptr);
for (grp_rp_entry_ptr = grp_mask_ptr->grp_rp_next;
grp_rp_entry_ptr != (rp_grp_entry_t *) NULL;
grp_rp_entry_ptr = grp_rp_entry_ptr->grp_rp_next)
{
PUT_EUADDR6(grp_rp_entry_ptr->rp->rpentry->address.sin6_addr, data_ptr);
PUT_HOSTSHORT(grp_rp_entry_ptr->advholdtime, data_ptr);
PUT_BYTE(grp_rp_entry_ptr->priority, data_ptr);
PUT_BYTE(0, data_ptr); /* The reserved field */
}
}
datalen = (data_ptr - (u_int8 *) send_buff) - sizeof(struct pim);
return (datalen);
}
/*
* Check if the rp_addr is the RP for the group corresponding to
* mrtentry_ptr. Return TRUE or FALSE.
*/
int
check_mrtentry_rp(mrtentry_ptr, rp_addr)
mrtentry_t *mrtentry_ptr;
struct sockaddr_in6 *rp_addr;
{
rp_grp_entry_t *rp_grp_entry_ptr;
if (mrtentry_ptr == (mrtentry_t *) NULL)
return (FALSE);
if (IN6_IS_ADDR_UNSPECIFIED(&rp_addr->sin6_addr))
return (FALSE);
rp_grp_entry_ptr = mrtentry_ptr->group->active_rp_grp;
if (rp_grp_entry_ptr == (rp_grp_entry_t *) NULL)
return (FALSE);
if (inet6_equal(&mrtentry_ptr->group->rpaddr,rp_addr))
return (TRUE);
return (FALSE);
}
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