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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PIM for Quagga: add the ability to configure multicast static routes
* Copyright (C) 2014 Nathan Bahr, ATCorp
*/
#include <zebra.h>
#include "vty.h"
#include "if.h"
#include "log.h"
#include "memory.h"
#include "linklist.h"
#include "pimd.h"
#include "pim_instance.h"
#include "pim_oil.h"
#include "pim_static.h"
#include "pim_time.h"
#include "pim_str.h"
#include "pim_iface.h"
void pim_static_route_free(struct static_route *s_route)
{
XFREE(MTYPE_PIM_STATIC_ROUTE, s_route);
}
static struct static_route *static_route_alloc(void)
{
return XCALLOC(MTYPE_PIM_STATIC_ROUTE, sizeof(struct static_route));
}
static struct static_route *static_route_new(ifindex_t iif, ifindex_t oif,
pim_addr group,
pim_addr source)
{
struct static_route *s_route;
s_route = static_route_alloc();
s_route->group = group;
s_route->source = source;
s_route->iif = iif;
s_route->oif_ttls[oif] = 1;
s_route->c_oil.oil_ref_count = 1;
*oil_origin(&s_route->c_oil) = source;
*oil_mcastgrp(&s_route->c_oil) = group;
*oil_incoming_vif(&s_route->c_oil) = iif;
oil_if_set(&s_route->c_oil, oif, 1);
s_route->c_oil.oif_creation[oif] = pim_time_monotonic_sec();
return s_route;
}
int pim_static_add(struct pim_instance *pim, struct interface *iif,
struct interface *oif, pim_addr group, pim_addr source)
{
struct listnode *node = NULL;
struct static_route *s_route = NULL;
struct static_route *original_s_route = NULL;
struct pim_interface *pim_iif = iif ? iif->info : NULL;
struct pim_interface *pim_oif = oif ? oif->info : NULL;
ifindex_t iif_index = pim_iif ? pim_iif->mroute_vif_index : 0;
ifindex_t oif_index = pim_oif ? pim_oif->mroute_vif_index : 0;
if (!iif_index || !oif_index || iif_index == -1 || oif_index == -1) {
zlog_warn(
"%s %s: Unable to add static route: Invalid interface index(iif=%d,oif=%d)",
__FILE__, __func__, iif_index, oif_index);
return -2;
}
#ifdef PIM_ENFORCE_LOOPFREE_MFC
if (iif_index == oif_index) {
/* looped MFC entry */
zlog_warn(
"%s %s: Unable to add static route: Looped MFC entry(iif=%d,oif=%d)",
__FILE__, __func__, iif_index, oif_index);
return -4;
}
#endif
if (iif->vrf->vrf_id != oif->vrf->vrf_id) {
return -3;
}
for (ALL_LIST_ELEMENTS_RO(pim->static_routes, node, s_route)) {
if (!pim_addr_cmp(s_route->group, group) &&
!pim_addr_cmp(s_route->source, source) &&
(s_route->iif == iif_index)) {
if (s_route->oif_ttls[oif_index]) {
zlog_warn(
"%s %s: Unable to add static route: Route already exists (iif=%d,oif=%d,group=%pPAs,source=%pPAs)",
__FILE__, __func__, iif_index,
oif_index, &group, &source);
return -3;
}
/* Ok, from here on out we will be making changes to the
* s_route structure, but if
* for some reason we fail to commit these changes to
* the kernel, we want to be able
* restore the state of the list. So copy the node data
* and if need be, we can copy
* back if it fails.
*/
original_s_route = static_route_alloc();
memcpy(original_s_route, s_route,
sizeof(struct static_route));
/* Route exists and has the same input interface, but
* adding a new output interface */
s_route->oif_ttls[oif_index] = 1;
oil_if_set(&s_route->c_oil, oif_index, 1);
s_route->c_oil.oif_creation[oif_index] =
pim_time_monotonic_sec();
++s_route->c_oil.oil_ref_count;
break;
}
}
/* If node is null then we reached the end of the list without finding a
* match */
if (!node) {
s_route = static_route_new(iif_index, oif_index, group, source);
listnode_add(pim->static_routes, s_route);
}
s_route->c_oil.pim = pim;
if (pim_static_mroute_add(&s_route->c_oil, __func__)) {
zlog_warn(
"%s %s: Unable to add static route(iif=%d,oif=%d,group=%pPAs,source=%pPAs)",
__FILE__, __func__, iif_index, oif_index, &group,
&source);
/* Need to put s_route back to the way it was */
if (original_s_route) {
memcpy(s_route, original_s_route,
sizeof(struct static_route));
} else {
/* we never stored off a copy, so it must have been a
* fresh new route */
listnode_delete(pim->static_routes, s_route);
pim_static_route_free(s_route);
}
if (original_s_route) {
pim_static_route_free(original_s_route);
}
return -1;
}
/* Make sure we free the memory for the route copy if used */
if (original_s_route) {
pim_static_route_free(original_s_route);
}
if (PIM_DEBUG_STATIC) {
zlog_debug(
"%s: Static route added(iif=%d,oif=%d,group=%pPAs,source=%pPAs)",
__func__, iif_index, oif_index, &group,
&source);
}
return 0;
}
int pim_static_del(struct pim_instance *pim, struct interface *iif,
struct interface *oif, pim_addr group, pim_addr source)
{
struct listnode *node = NULL;
struct listnode *nextnode = NULL;
struct static_route *s_route = NULL;
struct pim_interface *pim_iif = iif ? iif->info : 0;
struct pim_interface *pim_oif = oif ? oif->info : 0;
ifindex_t iif_index = pim_iif ? pim_iif->mroute_vif_index : 0;
ifindex_t oif_index = pim_oif ? pim_oif->mroute_vif_index : 0;
if (!iif_index || !oif_index) {
zlog_warn(
"%s %s: Unable to remove static route: Invalid interface index(iif=%d,oif=%d)",
__FILE__, __func__, iif_index, oif_index);
return -2;
}
for (ALL_LIST_ELEMENTS(pim->static_routes, node, nextnode, s_route)) {
if (s_route->iif == iif_index
&& !pim_addr_cmp(s_route->group, group)
&& !pim_addr_cmp(s_route->source, source)
&& s_route->oif_ttls[oif_index]) {
s_route->oif_ttls[oif_index] = 0;
oil_if_set(&s_route->c_oil, oif_index, 0);
--s_route->c_oil.oil_ref_count;
/* If there are no more outputs then delete the whole
* route, otherwise set the route with the new outputs
*/
if (s_route->c_oil.oil_ref_count <= 0
? pim_mroute_del(&s_route->c_oil, __func__)
: pim_static_mroute_add(&s_route->c_oil,
__func__)) {
zlog_warn(
"%s %s: Unable to remove static route(iif=%d,oif=%d,group=%pPAs,source=%pPAs)",
__FILE__, __func__, iif_index,
oif_index, &group, &source);
s_route->oif_ttls[oif_index] = 1;
oil_if_set(&s_route->c_oil, oif_index, 1);
++s_route->c_oil.oil_ref_count;
return -1;
}
s_route->c_oil.oif_creation[oif_index] = 0;
if (s_route->c_oil.oil_ref_count <= 0) {
listnode_delete(pim->static_routes, s_route);
pim_static_route_free(s_route);
}
if (PIM_DEBUG_STATIC) {
zlog_debug(
"%s: Static route removed(iif=%d,oif=%d,group=%pPAs,source=%pPAs)",
__func__, iif_index, oif_index,
&group, &source);
}
break;
}
}
if (!node) {
zlog_warn(
"%s %s: Unable to remove static route: Route does not exist(iif=%d,oif=%d,group=%pPAs,source=%pPAs)",
__FILE__, __func__, iif_index, oif_index, &group,
&source);
return -3;
}
return 0;
}
int pim_static_write_mroute(struct pim_instance *pim, struct vty *vty,
struct interface *ifp)
{
struct pim_interface *pim_ifp = ifp->info;
struct listnode *node;
struct static_route *sroute;
int count = 0;
if (!pim_ifp)
return 0;
for (ALL_LIST_ELEMENTS_RO(pim->static_routes, node, sroute)) {
if (sroute->iif == pim_ifp->mroute_vif_index) {
int i;
for (i = 0; i < MAXVIFS; i++)
if (sroute->oif_ttls[i]) {
struct interface *oifp =
pim_if_find_by_vif_index(pim,
i);
if (pim_addr_is_any(sroute->source))
vty_out(vty,
" " PIM_AF_NAME " mroute %s %pPA\n",
oifp->name, &sroute->group);
else
vty_out(vty,
" " PIM_AF_NAME " mroute %s %pPA %pPA\n",
oifp->name, &sroute->group,
&sroute->source);
count++;
}
}
}
return count;
}
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