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/*
* STATICd - route code
* Copyright (C) 2018 Cumulus Networks, Inc.
* Donald Sharp
*
* 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 <lib/nexthop.h>
#include <lib/memory.h>
#include <lib/srcdest_table.h>
#include <lib/if.h>
#include <lib/vty.h>
#include <lib/vrf.h>
#include <lib/memory.h>
#include "printfrr.h"
#include "static_vrf.h"
#include "static_routes.h"
#include "static_zebra.h"
#include "static_debug.h"
DEFINE_MGROUP(STATIC, "staticd");
DEFINE_MTYPE_STATIC(STATIC, STATIC_ROUTE, "Static Route Info");
DEFINE_MTYPE_STATIC(STATIC, STATIC_PATH, "Static Path");
DEFINE_MTYPE_STATIC(STATIC, STATIC_NEXTHOP, "Static Nexthop");
void zebra_stable_node_cleanup(struct route_table *table,
struct route_node *node)
{
struct static_nexthop *nh;
struct static_path *pn;
struct static_route_info *si;
struct route_table *src_table;
struct route_node *src_node;
struct static_path *src_pn;
struct static_route_info *src_si;
si = node->info;
if (si) {
frr_each_safe(static_path_list, &si->path_list, pn) {
frr_each_safe(static_nexthop_list, &pn->nexthop_list,
nh) {
static_nexthop_list_del(&pn->nexthop_list, nh);
XFREE(MTYPE_STATIC_NEXTHOP, nh);
}
static_path_list_del(&si->path_list, pn);
XFREE(MTYPE_STATIC_PATH, pn);
}
/* clean up for dst table */
src_table = srcdest_srcnode_table(node);
if (src_table) {
/* This means the route_node is part of the top
* hierarchy and refers to a destination prefix.
*/
for (src_node = route_top(src_table); src_node;
src_node = route_next(src_node)) {
src_si = src_node->info;
frr_each_safe(static_path_list,
&src_si->path_list, src_pn) {
frr_each_safe(static_nexthop_list,
&src_pn->nexthop_list,
nh) {
static_nexthop_list_del(
&src_pn->nexthop_list,
nh);
XFREE(MTYPE_STATIC_NEXTHOP, nh);
}
static_path_list_del(&src_si->path_list,
src_pn);
XFREE(MTYPE_STATIC_PATH, src_pn);
}
XFREE(MTYPE_STATIC_ROUTE, src_node->info);
}
}
XFREE(MTYPE_STATIC_ROUTE, node->info);
}
}
/* Install static path into rib. */
void static_install_path(struct static_path *pn)
{
struct static_nexthop *nh;
frr_each(static_nexthop_list, &pn->nexthop_list, nh)
static_zebra_nht_register(nh, true);
if (static_nexthop_list_count(&pn->nexthop_list))
static_zebra_route_add(pn, true);
}
/* Uninstall static path from RIB. */
static void static_uninstall_path(struct static_path *pn)
{
if (static_nexthop_list_count(&pn->nexthop_list))
static_zebra_route_add(pn, true);
else
static_zebra_route_add(pn, false);
}
struct route_node *static_add_route(afi_t afi, safi_t safi, struct prefix *p,
struct prefix_ipv6 *src_p,
struct static_vrf *svrf)
{
struct route_node *rn;
struct static_route_info *si;
struct route_table *stable = svrf->stable[afi][safi];
assert(stable);
/* Lookup static route prefix. */
rn = srcdest_rnode_get(stable, p, src_p);
si = XCALLOC(MTYPE_STATIC_ROUTE, sizeof(struct static_route_info));
si->svrf = svrf;
si->safi = safi;
static_path_list_init(&(si->path_list));
rn->info = si;
return rn;
}
/* To delete the srcnodes */
static void static_del_src_route(struct route_node *rn)
{
struct static_path *pn;
struct static_route_info *si;
si = rn->info;
frr_each_safe(static_path_list, &si->path_list, pn) {
static_del_path(pn);
}
XFREE(MTYPE_STATIC_ROUTE, rn->info);
route_unlock_node(rn);
}
void static_del_route(struct route_node *rn)
{
struct static_path *pn;
struct static_route_info *si;
struct route_table *src_table;
struct route_node *src_node;
si = rn->info;
frr_each_safe(static_path_list, &si->path_list, pn) {
static_del_path(pn);
}
/* clean up for dst table */
src_table = srcdest_srcnode_table(rn);
if (src_table) {
/* This means the route_node is part of the top hierarchy
* and refers to a destination prefix.
*/
for (src_node = route_top(src_table); src_node;
src_node = route_next(src_node)) {
static_del_src_route(src_node);
}
}
XFREE(MTYPE_STATIC_ROUTE, rn->info);
route_unlock_node(rn);
}
bool static_add_nexthop_validate(const char *nh_vrf_name,
enum static_nh_type type,
struct ipaddr *ipaddr)
{
struct vrf *vrf;
vrf = vrf_lookup_by_name(nh_vrf_name);
if (!vrf)
return true;
switch (type) {
case STATIC_IPV4_GATEWAY:
case STATIC_IPV4_GATEWAY_IFNAME:
if (if_address_is_local(&ipaddr->ipaddr_v4, AF_INET,
vrf->vrf_id))
return false;
break;
case STATIC_IPV6_GATEWAY:
case STATIC_IPV6_GATEWAY_IFNAME:
if (if_address_is_local(&ipaddr->ipaddr_v6, AF_INET6,
vrf->vrf_id))
return false;
break;
default:
break;
}
return true;
}
struct static_path *static_add_path(struct route_node *rn, uint32_t table_id,
uint8_t distance)
{
struct static_path *pn;
struct static_route_info *si;
route_lock_node(rn);
/* Make new static route structure. */
pn = XCALLOC(MTYPE_STATIC_PATH, sizeof(struct static_path));
pn->rn = rn;
pn->distance = distance;
pn->table_id = table_id;
static_nexthop_list_init(&(pn->nexthop_list));
si = rn->info;
static_path_list_add_head(&(si->path_list), pn);
return pn;
}
void static_del_path(struct static_path *pn)
{
struct route_node *rn = pn->rn;
struct static_route_info *si;
struct static_nexthop *nh;
si = rn->info;
static_path_list_del(&si->path_list, pn);
frr_each_safe(static_nexthop_list, &pn->nexthop_list, nh) {
static_delete_nexthop(nh);
}
route_unlock_node(rn);
XFREE(MTYPE_STATIC_PATH, pn);
}
struct static_nexthop *static_add_nexthop(struct static_path *pn,
enum static_nh_type type,
struct ipaddr *ipaddr,
const char *ifname,
const char *nh_vrf, uint32_t color)
{
struct route_node *rn = pn->rn;
struct static_nexthop *nh;
struct static_vrf *nh_svrf;
struct interface *ifp;
struct static_nexthop *cp;
route_lock_node(rn);
nh_svrf = static_vrf_lookup_by_name(nh_vrf);
/* Make new static route structure. */
nh = XCALLOC(MTYPE_STATIC_NEXTHOP, sizeof(struct static_nexthop));
nh->pn = pn;
nh->type = type;
nh->color = color;
if (nh->type == STATIC_BLACKHOLE)
nh->bh_type = STATIC_BLACKHOLE_NULL;
nh->nh_vrf_id = nh_svrf ? nh_svrf->vrf->vrf_id : VRF_UNKNOWN;
strlcpy(nh->nh_vrfname, nh_vrf, sizeof(nh->nh_vrfname));
if (ifname)
strlcpy(nh->ifname, ifname, sizeof(nh->ifname));
nh->ifindex = IFINDEX_INTERNAL;
switch (type) {
case STATIC_IPV4_GATEWAY:
case STATIC_IPV4_GATEWAY_IFNAME:
nh->addr.ipv4 = ipaddr->ipaddr_v4;
break;
case STATIC_IPV6_GATEWAY:
case STATIC_IPV6_GATEWAY_IFNAME:
nh->addr.ipv6 = ipaddr->ipaddr_v6;
break;
default:
break;
}
/*
* Add new static route information to the tree with sort by
* gateway address.
*/
frr_each(static_nexthop_list, &pn->nexthop_list, cp) {
if (nh->type == STATIC_IPV4_GATEWAY
&& cp->type == STATIC_IPV4_GATEWAY) {
if (ntohl(nh->addr.ipv4.s_addr)
< ntohl(cp->addr.ipv4.s_addr))
break;
if (ntohl(nh->addr.ipv4.s_addr)
> ntohl(cp->addr.ipv4.s_addr))
continue;
}
}
static_nexthop_list_add_after(&(pn->nexthop_list), cp, nh);
if (nh->nh_vrf_id == VRF_UNKNOWN) {
zlog_warn(
"Static Route to %pFX not installed currently because dependent config not fully available",
&rn->p);
return nh;
}
/* check whether interface exists in system & install if it does */
switch (nh->type) {
case STATIC_IPV4_GATEWAY:
case STATIC_IPV6_GATEWAY:
case STATIC_BLACKHOLE:
break;
case STATIC_IPV4_GATEWAY_IFNAME:
case STATIC_IPV6_GATEWAY_IFNAME:
case STATIC_IFNAME:
ifp = if_lookup_by_name(ifname, nh->nh_vrf_id);
if (ifp && ifp->ifindex != IFINDEX_INTERNAL)
nh->ifindex = ifp->ifindex;
else
zlog_warn(
"Static Route using %s interface not installed because the interface does not exist in specified vrf",
ifname);
break;
}
return nh;
}
void static_install_nexthop(struct static_nexthop *nh)
{
struct static_path *pn = nh->pn;
struct route_node *rn = pn->rn;
struct interface *ifp;
if (nh->nh_vrf_id == VRF_UNKNOWN) {
char nexthop_str[NEXTHOP_STR];
static_get_nh_str(nh, nexthop_str, sizeof(nexthop_str));
DEBUGD(&static_dbg_route,
"Static Route %pFX not installed for %s vrf %s is unknown",
&rn->p, nexthop_str, nh->nh_vrfname);
return;
}
/* check whether interface exists in system & install if it does */
switch (nh->type) {
case STATIC_IPV4_GATEWAY:
case STATIC_IPV6_GATEWAY:
if (!static_zebra_nh_update(nh))
static_zebra_nht_register(nh, true);
break;
case STATIC_IPV4_GATEWAY_IFNAME:
case STATIC_IPV6_GATEWAY_IFNAME:
if (!static_zebra_nh_update(nh))
static_zebra_nht_register(nh, true);
break;
case STATIC_BLACKHOLE:
static_install_path(pn);
break;
case STATIC_IFNAME:
ifp = if_lookup_by_name(nh->ifname, nh->nh_vrf_id);
if (ifp && ifp->ifindex != IFINDEX_INTERNAL)
static_install_path(pn);
break;
}
}
void static_delete_nexthop(struct static_nexthop *nh)
{
struct static_path *pn = nh->pn;
struct route_node *rn = pn->rn;
static_nexthop_list_del(&(pn->nexthop_list), nh);
if (nh->nh_vrf_id == VRF_UNKNOWN)
goto EXIT;
static_zebra_nht_register(nh, false);
/*
* If we have other si nodes then route replace
* else delete the route
*/
static_uninstall_path(pn);
EXIT:
route_unlock_node(rn);
/* Free static route configuration. */
XFREE(MTYPE_STATIC_NEXTHOP, nh);
}
static void static_ifindex_update_nh(struct interface *ifp, bool up,
struct route_node *rn,
struct static_path *pn,
struct static_nexthop *nh,
struct static_vrf *svrf, safi_t safi)
{
if (!nh->ifname[0])
return;
if (up) {
if (strcmp(nh->ifname, ifp->name))
return;
if (nh->nh_vrf_id != ifp->vrf->vrf_id)
return;
nh->ifindex = ifp->ifindex;
} else {
if (nh->ifindex != ifp->ifindex)
return;
if (nh->nh_vrf_id != ifp->vrf->vrf_id)
return;
nh->ifindex = IFINDEX_INTERNAL;
}
static_install_path(pn);
}
static void static_ifindex_update_af(struct interface *ifp, bool up, afi_t afi,
safi_t safi)
{
struct route_table *stable;
struct route_node *rn;
struct static_nexthop *nh;
struct static_path *pn;
struct vrf *vrf;
struct static_route_info *si;
RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
struct static_vrf *svrf;
svrf = vrf->info;
stable = static_vrf_static_table(afi, safi, svrf);
if (!stable)
continue;
for (rn = route_top(stable); rn; rn = srcdest_route_next(rn)) {
si = static_route_info_from_rnode(rn);
if (!si)
continue;
frr_each(static_path_list, &si->path_list, pn) {
frr_each(static_nexthop_list,
&pn->nexthop_list, nh) {
static_ifindex_update_nh(ifp, up, rn,
pn, nh, svrf,
safi);
}
}
}
}
}
/*
* This function looks at a svrf's stable and notices if any of the
* nexthops we are using are part of the vrf coming up.
* If we are using them then cleanup the nexthop vrf id
* to be the new value and then re-installs them
*
*
* stable -> The table we are looking at.
* svrf -> The newly changed vrf.
* afi -> The afi to look at
* safi -> the safi to look at
*/
static void static_fixup_vrf(struct static_vrf *svrf,
struct route_table *stable, afi_t afi, safi_t safi)
{
struct route_node *rn;
struct static_nexthop *nh;
struct interface *ifp;
struct static_path *pn;
struct static_route_info *si;
for (rn = route_top(stable); rn; rn = route_next(rn)) {
si = static_route_info_from_rnode(rn);
if (!si)
continue;
frr_each(static_path_list, &si->path_list, pn) {
frr_each(static_nexthop_list, &pn->nexthop_list, nh) {
if (strcmp(svrf->vrf->name, nh->nh_vrfname)
!= 0)
continue;
nh->nh_vrf_id = svrf->vrf->vrf_id;
nh->nh_registered = false;
if (nh->ifindex) {
ifp = if_lookup_by_name(nh->ifname,
nh->nh_vrf_id);
if (ifp)
nh->ifindex = ifp->ifindex;
else
continue;
}
static_install_path(pn);
}
}
}
}
/*
* This function enables static routes in a svrf as it
* is coming up. It sets the new vrf_id as appropriate.
*
* svrf -> The svrf that is being brought up and enabled by the kernel
* stable -> The stable we are looking at.
* afi -> the afi in question
* safi -> the safi in question
*/
static void static_enable_vrf(struct static_vrf *svrf,
struct route_table *stable, afi_t afi,
safi_t safi)
{
struct route_node *rn;
struct static_nexthop *nh;
struct interface *ifp;
struct static_path *pn;
struct static_route_info *si;
for (rn = route_top(stable); rn; rn = route_next(rn)) {
si = static_route_info_from_rnode(rn);
if (!si)
continue;
frr_each(static_path_list, &si->path_list, pn) {
frr_each(static_nexthop_list, &pn->nexthop_list, nh) {
if (nh->ifindex) {
ifp = if_lookup_by_name(nh->ifname,
nh->nh_vrf_id);
if (ifp)
nh->ifindex = ifp->ifindex;
else
continue;
}
if (nh->nh_vrf_id == VRF_UNKNOWN)
continue;
static_install_path(pn);
}
}
}
}
/*
* When a vrf is being enabled by the kernel, go through all the
* static routes in the system that use this vrf (both nexthops vrfs
* and the routes vrf )
*
* enable_svrf -> the vrf being enabled
*/
void static_fixup_vrf_ids(struct static_vrf *enable_svrf)
{
struct route_table *stable;
struct vrf *vrf;
afi_t afi;
safi_t safi;
RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
struct static_vrf *svrf;
svrf = vrf->info;
/* Install any static routes configured for this VRF. */
FOREACH_AFI_SAFI (afi, safi) {
stable = svrf->stable[afi][safi];
if (!stable)
continue;
static_fixup_vrf(enable_svrf, stable, afi, safi);
if (enable_svrf == svrf)
static_enable_vrf(svrf, stable, afi, safi);
}
}
}
/*
* Look at the specified stable and if any of the routes in
* this table are using the svrf as the nexthop, uninstall
* those routes.
*
* svrf -> the vrf being disabled
* stable -> the table we need to look at.
* afi -> the afi in question
* safi -> the safi in question
*/
static void static_cleanup_vrf(struct static_vrf *svrf,
struct route_table *stable,
afi_t afi, safi_t safi)
{
struct route_node *rn;
struct static_nexthop *nh;
struct static_path *pn;
struct static_route_info *si;
for (rn = route_top(stable); rn; rn = route_next(rn)) {
si = static_route_info_from_rnode(rn);
if (!si)
continue;
frr_each(static_path_list, &si->path_list, pn) {
frr_each(static_nexthop_list, &pn->nexthop_list, nh) {
if (strcmp(svrf->vrf->name, nh->nh_vrfname)
!= 0)
continue;
static_uninstall_path(pn);
}
}
}
}
/*
* Look at all static routes in this table and uninstall
* them.
*
* stable -> The table to uninstall from
* afi -> The afi in question
* safi -> the safi in question
*/
static void static_disable_vrf(struct route_table *stable,
afi_t afi, safi_t safi)
{
struct route_node *rn;
struct static_nexthop *nh;
struct static_path *pn;
struct static_route_info *si;
for (rn = route_top(stable); rn; rn = route_next(rn)) {
si = static_route_info_from_rnode(rn);
if (!si)
continue;
frr_each(static_path_list, &si->path_list, pn) {
frr_each(static_nexthop_list, &pn->nexthop_list, nh) {
static_uninstall_path(pn);
}
}
}
}
/*
* When the disable_svrf is shutdown by the kernel, we call
* this function and it cleans up all static routes using
* this vrf as a nexthop as well as all static routes
* in it's stables.
*
* disable_svrf - The vrf being disabled
*/
void static_cleanup_vrf_ids(struct static_vrf *disable_svrf)
{
struct vrf *vrf;
afi_t afi;
safi_t safi;
RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
struct static_vrf *svrf;
svrf = vrf->info;
/* Uninstall any static routes configured for this VRF. */
FOREACH_AFI_SAFI (afi, safi) {
struct route_table *stable;
stable = svrf->stable[afi][safi];
if (!stable)
continue;
static_cleanup_vrf(disable_svrf, stable, afi, safi);
if (disable_svrf == svrf)
static_disable_vrf(stable, afi, safi);
}
}
}
/*
* This function enables static routes when an interface it relies
* on in a different vrf is coming up.
*
* stable -> The stable we are looking at.
* ifp -> interface coming up
* afi -> the afi in question
* safi -> the safi in question
*/
static void static_fixup_intf_nh(struct route_table *stable,
struct interface *ifp,
afi_t afi, safi_t safi)
{
struct route_node *rn;
struct static_nexthop *nh;
struct static_path *pn;
struct static_route_info *si;
for (rn = route_top(stable); rn; rn = route_next(rn)) {
si = static_route_info_from_rnode(rn);
if (!si)
continue;
frr_each(static_path_list, &si->path_list, pn) {
frr_each(static_nexthop_list, &pn->nexthop_list, nh) {
if (nh->nh_vrf_id != ifp->vrf->vrf_id)
continue;
if (nh->ifindex != ifp->ifindex)
continue;
static_install_path(pn);
}
}
}
}
/*
* This function enables static routes that rely on an interface in
* a different vrf when that interface comes up.
*/
void static_install_intf_nh(struct interface *ifp)
{
struct route_table *stable;
struct vrf *vrf;
afi_t afi;
safi_t safi;
RB_FOREACH(vrf, vrf_name_head, &vrfs_by_name) {
struct static_vrf *svrf = vrf->info;
/* Not needed if same vrf since happens naturally */
if (vrf->vrf_id == ifp->vrf->vrf_id)
continue;
/* Install any static routes configured for this interface. */
FOREACH_AFI_SAFI (afi, safi) {
stable = svrf->stable[afi][safi];
if (!stable)
continue;
static_fixup_intf_nh(stable, ifp, afi, safi);
}
}
}
/* called from if_{add,delete}_update, i.e. when ifindex becomes [in]valid */
void static_ifindex_update(struct interface *ifp, bool up)
{
static_ifindex_update_af(ifp, up, AFI_IP, SAFI_UNICAST);
static_ifindex_update_af(ifp, up, AFI_IP, SAFI_MULTICAST);
static_ifindex_update_af(ifp, up, AFI_IP6, SAFI_UNICAST);
static_ifindex_update_af(ifp, up, AFI_IP6, SAFI_MULTICAST);
}
void static_get_nh_type(enum static_nh_type stype, char *type, size_t size)
{
switch (stype) {
case STATIC_IFNAME:
strlcpy(type, "ifindex", size);
break;
case STATIC_IPV4_GATEWAY:
strlcpy(type, "ip4", size);
break;
case STATIC_IPV4_GATEWAY_IFNAME:
strlcpy(type, "ip4-ifindex", size);
break;
case STATIC_BLACKHOLE:
strlcpy(type, "blackhole", size);
break;
case STATIC_IPV6_GATEWAY:
strlcpy(type, "ip6", size);
break;
case STATIC_IPV6_GATEWAY_IFNAME:
strlcpy(type, "ip6-ifindex", size);
break;
};
}
struct stable_info *static_get_stable_info(struct route_node *rn)
{
struct route_table *table;
table = srcdest_rnode_table(rn);
return table->info;
}
void static_get_nh_str(struct static_nexthop *nh, char *nexthop, size_t size)
{
switch (nh->type) {
case STATIC_IFNAME:
snprintfrr(nexthop, size, "ifindex : %s", nh->ifname);
break;
case STATIC_IPV4_GATEWAY:
snprintfrr(nexthop, size, "ip4 : %pI4", &nh->addr.ipv4);
break;
case STATIC_IPV4_GATEWAY_IFNAME:
snprintfrr(nexthop, size, "ip4-ifindex : %pI4 : %s",
&nh->addr.ipv4, nh->ifname);
break;
case STATIC_BLACKHOLE:
snprintfrr(nexthop, size, "blackhole : %d", nh->bh_type);
break;
case STATIC_IPV6_GATEWAY:
snprintfrr(nexthop, size, "ip6 : %pI6", &nh->addr.ipv6);
break;
case STATIC_IPV6_GATEWAY_IFNAME:
snprintfrr(nexthop, size, "ip6-ifindex : %pI6 : %s",
&nh->addr.ipv6, nh->ifname);
break;
};
}
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