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/*
PIM for Quagga
Copyright (C) 2008 Everton da Silva Marques
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING; if not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301 USA
*/
#include <zebra.h>
#include "log.h"
#include "memory.h"
#include "linklist.h"
#include "if.h"
#include "pimd.h"
#include "pim_oil.h"
#include "pim_str.h"
#include "pim_iface.h"
#include "pim_time.h"
void pim_channel_oil_free(struct channel_oil *c_oil)
{
XFREE(MTYPE_PIM_CHANNEL_OIL, c_oil);
}
static void pim_channel_oil_delete(struct channel_oil *c_oil)
{
/*
notice that listnode_delete() can't be moved
into pim_channel_oil_free() because the later is
called by list_delete_all_node()
*/
listnode_delete(qpim_channel_oil_list, c_oil);
pim_channel_oil_free(c_oil);
}
static struct channel_oil *channel_oil_new(struct in_addr group_addr,
struct in_addr source_addr,
int input_vif_index)
{
struct channel_oil *c_oil;
struct interface *ifp_in;
ifp_in = pim_if_find_by_vif_index(input_vif_index);
if (!ifp_in) {
/* warning only */
char group_str[100];
char source_str[100];
pim_inet4_dump("<group?>", group_addr, group_str, sizeof(group_str));
pim_inet4_dump("<source?>", source_addr, source_str, sizeof(source_str));
zlog_warn("%s: (S,G)=(%s,%s) could not find input interface for input_vif_index=%d",
__PRETTY_FUNCTION__,
source_str, group_str, input_vif_index);
}
c_oil = XCALLOC(MTYPE_PIM_CHANNEL_OIL, sizeof(*c_oil));
if (!c_oil) {
zlog_err("PIM XCALLOC(%zu) failure", sizeof(*c_oil));
return 0;
}
c_oil->oil.mfcc_mcastgrp = group_addr;
c_oil->oil.mfcc_origin = source_addr;
c_oil->oil.mfcc_parent = input_vif_index;
c_oil->oil_ref_count = 1;
c_oil->installed = 0;
zassert(c_oil->oil_size == 0);
return c_oil;
}
static struct channel_oil *pim_add_channel_oil(struct in_addr group_addr,
struct in_addr source_addr,
int input_vif_index)
{
struct channel_oil *c_oil;
c_oil = channel_oil_new(group_addr, source_addr, input_vif_index);
if (!c_oil) {
zlog_warn("PIM XCALLOC(%zu) failure", sizeof(*c_oil));
return 0;
}
listnode_add(qpim_channel_oil_list, c_oil);
return c_oil;
}
static struct channel_oil *pim_find_channel_oil(struct in_addr group_addr,
struct in_addr source_addr)
{
struct listnode *node;
struct channel_oil *c_oil;
for (ALL_LIST_ELEMENTS_RO(qpim_channel_oil_list, node, c_oil)) {
if ((group_addr.s_addr == c_oil->oil.mfcc_mcastgrp.s_addr) &&
(source_addr.s_addr == c_oil->oil.mfcc_origin.s_addr))
return c_oil;
}
return 0;
}
struct channel_oil *pim_channel_oil_add(struct in_addr group_addr,
struct in_addr source_addr,
int input_vif_index)
{
struct channel_oil *c_oil;
c_oil = pim_find_channel_oil(group_addr, source_addr);
if (c_oil) {
++c_oil->oil_ref_count;
return c_oil;
}
return pim_add_channel_oil(group_addr, source_addr, input_vif_index);
}
void pim_channel_oil_del(struct channel_oil *c_oil)
{
--c_oil->oil_ref_count;
if (c_oil->oil_ref_count < 1) {
pim_channel_oil_delete(c_oil);
}
}
int pim_channel_add_oif(struct channel_oil *channel_oil,
struct interface *oif,
uint32_t proto_mask)
{
struct pim_interface *pim_ifp;
int old_ttl;
zassert(channel_oil);
pim_ifp = oif->info;
if (PIM_DEBUG_MROUTE) {
char group_str[100];
char source_str[100];
pim_inet4_dump("<group?>", channel_oil->oil.mfcc_mcastgrp, group_str, sizeof(group_str));
pim_inet4_dump("<source?>", channel_oil->oil.mfcc_origin, source_str, sizeof(source_str));
zlog_debug("%s %s: (S,G)=(%s,%s): proto_mask=%u OIF=%s vif_index=%d",
__FILE__, __PRETTY_FUNCTION__,
source_str, group_str,
proto_mask, oif->name, pim_ifp->mroute_vif_index);
}
#ifdef PIM_ENFORCE_LOOPFREE_MFC
/*
Prevent creating MFC entry with OIF=IIF.
This is a protection against implementation mistakes.
PIM protocol implicitely ensures loopfree multicast topology.
IGMP must be protected against adding looped MFC entries created
by both source and receiver attached to the same interface. See
TODO T22.
*/
if (pim_ifp->mroute_vif_index == channel_oil->oil.mfcc_parent) {
if (PIM_DEBUG_MROUTE)
{
char group_str[100];
char source_str[100];
pim_inet4_dump("<group?>", channel_oil->oil.mfcc_mcastgrp, group_str, sizeof(group_str));
pim_inet4_dump("<source?>", channel_oil->oil.mfcc_origin, source_str, sizeof(source_str));
zlog_debug("%s %s: refusing protocol mask %u request for IIF=OIF=%s (vif_index=%d) for channel (S,G)=(%s,%s)",
__FILE__, __PRETTY_FUNCTION__,
proto_mask, oif->name, pim_ifp->mroute_vif_index,
source_str, group_str);
}
return -2;
}
#endif
/* Prevent single protocol from subscribing same interface to
channel (S,G) multiple times */
if (channel_oil->oif_flags[pim_ifp->mroute_vif_index] & proto_mask) {
if (PIM_DEBUG_MROUTE)
{
char group_str[100];
char source_str[100];
pim_inet4_dump("<group?>", channel_oil->oil.mfcc_mcastgrp, group_str, sizeof(group_str));
pim_inet4_dump("<source?>", channel_oil->oil.mfcc_origin, source_str, sizeof(source_str));
zlog_debug("%s %s: existing protocol mask %u requested OIF %s (vif_index=%d, min_ttl=%d) for channel (S,G)=(%s,%s)",
__FILE__, __PRETTY_FUNCTION__,
proto_mask, oif->name, pim_ifp->mroute_vif_index,
channel_oil->oil.mfcc_ttls[pim_ifp->mroute_vif_index],
source_str, group_str);
}
return -3;
}
/* Allow other protocol to request subscription of same interface to
channel (S,G) multiple times, by silently ignoring further
requests */
if (channel_oil->oif_flags[pim_ifp->mroute_vif_index] & PIM_OIF_FLAG_PROTO_ANY) {
/* Check the OIF really exists before returning, and only log
warning otherwise */
if (channel_oil->oil.mfcc_ttls[pim_ifp->mroute_vif_index] < 1) {
if (PIM_DEBUG_MROUTE)
{
char group_str[100];
char source_str[100];
pim_inet4_dump("<group?>", channel_oil->oil.mfcc_mcastgrp, group_str, sizeof(group_str));
pim_inet4_dump("<source?>", channel_oil->oil.mfcc_origin, source_str, sizeof(source_str));
zlog_debug("%s %s: new protocol mask %u requested nonexistent OIF %s (vif_index=%d, min_ttl=%d) for channel (S,G)=(%s,%s)",
__FILE__, __PRETTY_FUNCTION__,
proto_mask, oif->name, pim_ifp->mroute_vif_index,
channel_oil->oil.mfcc_ttls[pim_ifp->mroute_vif_index],
source_str, group_str);
}
}
return 0;
}
old_ttl = channel_oil->oil.mfcc_ttls[pim_ifp->mroute_vif_index];
if (old_ttl > 0) {
if (PIM_DEBUG_MROUTE)
{
char group_str[100];
char source_str[100];
pim_inet4_dump("<group?>", channel_oil->oil.mfcc_mcastgrp, group_str, sizeof(group_str));
pim_inet4_dump("<source?>", channel_oil->oil.mfcc_origin, source_str, sizeof(source_str));
zlog_debug("%s %s: interface %s (vif_index=%d) is existing output for channel (S,G)=(%s,%s)",
__FILE__, __PRETTY_FUNCTION__,
oif->name, pim_ifp->mroute_vif_index,
source_str, group_str);
}
return -4;
}
channel_oil->oil.mfcc_ttls[pim_ifp->mroute_vif_index] = PIM_MROUTE_MIN_TTL;
if (pim_mroute_add(channel_oil)) {
if (PIM_DEBUG_MROUTE)
{
char group_str[100];
char source_str[100];
pim_inet4_dump("<group?>", channel_oil->oil.mfcc_mcastgrp, group_str, sizeof(group_str));
pim_inet4_dump("<source?>", channel_oil->oil.mfcc_origin, source_str, sizeof(source_str));
zlog_debug("%s %s: could not add output interface %s (vif_index=%d) for channel (S,G)=(%s,%s)",
__FILE__, __PRETTY_FUNCTION__,
oif->name, pim_ifp->mroute_vif_index,
source_str, group_str);
}
channel_oil->oil.mfcc_ttls[pim_ifp->mroute_vif_index] = old_ttl;
return -5;
}
channel_oil->oif_creation[pim_ifp->mroute_vif_index] = pim_time_monotonic_sec();
++channel_oil->oil_size;
channel_oil->oif_flags[pim_ifp->mroute_vif_index] |= proto_mask;
if (PIM_DEBUG_MROUTE) {
char group_str[100];
char source_str[100];
pim_inet4_dump("<group?>", channel_oil->oil.mfcc_mcastgrp, group_str, sizeof(group_str));
pim_inet4_dump("<source?>", channel_oil->oil.mfcc_origin, source_str, sizeof(source_str));
zlog_debug("%s %s: (S,G)=(%s,%s): proto_mask=%u OIF=%s vif_index=%d: DONE",
__FILE__, __PRETTY_FUNCTION__,
source_str, group_str,
proto_mask, oif->name, pim_ifp->mroute_vif_index);
}
return 0;
}
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