path: root/ripngd/ripng_zebra.c

/*
 * RIPngd and zebra interface.
 * Copyright (C) 1998, 1999 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra 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, or (at your option) any
 * later version.
 *
 * GNU Zebra 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 "command.h"
#include "prefix.h"
#include "table.h"
#include "stream.h"
#include "memory.h"
#include "routemap.h"
#include "zclient.h"
#include "log.h"

#include "ripngd/ripngd.h"
#include "ripngd/ripng_debug.h"

/* All information about zebra. */
struct zclient *zclient = NULL;

/* Send ECMP routes to zebra. */
static void ripng_zebra_ipv6_send(struct route_node *rp, u_char cmd)
{
	static struct in6_addr **nexthops = NULL;
	static ifindex_t *ifindexes = NULL;
	static unsigned int nexthops_len = 0;

	struct list *list = (struct list *)rp->info;
	struct zapi_ipv6 api;
	struct listnode *listnode = NULL;
	struct ripng_info *rinfo = NULL;
	int count = 0;

	if (vrf_bitmap_check(zclient->redist[AFI_IP6][ZEBRA_ROUTE_RIPNG],
			     VRF_DEFAULT)) {
		api.vrf_id = VRF_DEFAULT;
		api.type = ZEBRA_ROUTE_RIPNG;
		api.instance = 0;
		api.flags = 0;
		api.message = 0;
		api.safi = SAFI_UNICAST;

		if (nexthops_len < listcount(list)) {
			nexthops_len = listcount(list);
			nexthops = XREALLOC(
				MTYPE_TMP, nexthops,
				nexthops_len * sizeof(struct in6_addr *));
			ifindexes =
				XREALLOC(MTYPE_TMP, ifindexes,
					 nexthops_len * sizeof(unsigned int));
		}

		SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
		SET_FLAG(api.message, ZAPI_MESSAGE_IFINDEX);
		for (ALL_LIST_ELEMENTS_RO(list, listnode, rinfo)) {
			nexthops[count] = &rinfo->nexthop;
			ifindexes[count] = rinfo->ifindex;
			count++;
			if (cmd == ZEBRA_IPV6_ROUTE_ADD)
				SET_FLAG(rinfo->flags, RIPNG_RTF_FIB);
			else
				UNSET_FLAG(rinfo->flags, RIPNG_RTF_FIB);
		}

		api.nexthop = nexthops;
		api.nexthop_num = count;
		api.ifindex = ifindexes;
		api.ifindex_num = count;

		rinfo = listgetdata(listhead(list));

		SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
		api.metric = rinfo->metric;

		if (rinfo->tag) {
			SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
			api.tag = rinfo->tag;
		}

		zapi_ipv6_route(cmd, zclient, (struct prefix_ipv6 *)&rp->p,
				NULL, &api);

		if (IS_RIPNG_DEBUG_ZEBRA) {
			if (ripng->ecmp)
				zlog_debug("%s: %s/%d nexthops %d",
					   (cmd == ZEBRA_IPV6_ROUTE_ADD)
						   ? "Install into zebra"
						   : "Delete from zebra",
					   inet6_ntoa(rp->p.u.prefix6),
					   rp->p.prefixlen, count);
			else
				zlog_debug("%s: %s/%d",
					   (cmd == ZEBRA_IPV6_ROUTE_ADD)
						   ? "Install into zebra"
						   : "Delete from zebra",
					   inet6_ntoa(rp->p.u.prefix6),
					   rp->p.prefixlen);
		}
	}
}

/* Add/update ECMP routes to zebra. */
void ripng_zebra_ipv6_add(struct route_node *rp)
{
	ripng_zebra_ipv6_send(rp, ZEBRA_IPV6_ROUTE_ADD);
}

/* Delete ECMP routes from zebra. */
void ripng_zebra_ipv6_delete(struct route_node *rp)
{
	ripng_zebra_ipv6_send(rp, ZEBRA_IPV6_ROUTE_DELETE);
}

/* Zebra route add and delete treatment. */
static int ripng_zebra_read_ipv6(int command, struct zclient *zclient,
				 zebra_size_t length, vrf_id_t vrf_id)
{
	struct stream *s;
	struct zapi_ipv6 api;
	unsigned long ifindex;
	struct in6_addr nexthop;
	struct prefix_ipv6 p, src_p;

	s = zclient->ibuf;
	ifindex = 0;
	memset(&nexthop, 0, sizeof(struct in6_addr));

	/* Type, flags, message. */
	api.type = stream_getc(s);
	api.instance = stream_getw(s);
	api.flags = stream_getl(s);
	api.message = stream_getc(s);

	/* IPv6 prefix. */
	memset(&p, 0, sizeof(struct prefix_ipv6));
	p.family = AF_INET6;
	p.prefixlen = MIN(IPV6_MAX_PREFIXLEN, stream_getc(s));
	stream_get(&p.prefix, s, PSIZE(p.prefixlen));

	memset(&src_p, 0, sizeof(struct prefix_ipv6));
	src_p.family = AF_INET6;
	if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX)) {
		src_p.prefixlen = stream_getc(s);
		stream_get(&src_p.prefix, s, PSIZE(src_p.prefixlen));
	}

	if (src_p.prefixlen)
		/* we completely ignore srcdest routes for now. */
		return 0;

	/* Nexthop, ifindex, distance, metric. */
	if (CHECK_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP)) {
		api.nexthop_num = stream_getc(s);
		stream_get(&nexthop, s, 16);
	}
	if (CHECK_FLAG(api.message, ZAPI_MESSAGE_IFINDEX)) {
		api.ifindex_num = stream_getc(s);
		ifindex = stream_getl(s);
	}
	if (CHECK_FLAG(api.message, ZAPI_MESSAGE_DISTANCE))
		api.distance = stream_getc(s);
	else
		api.distance = 0;
	if (CHECK_FLAG(api.message, ZAPI_MESSAGE_METRIC))
		api.metric = stream_getl(s);
	else
		api.metric = 0;

	if (CHECK_FLAG(api.message, ZAPI_MESSAGE_TAG))
		api.tag = stream_getl(s);
	else
		api.tag = 0;

	if (command == ZEBRA_REDISTRIBUTE_IPV6_ADD)
		ripng_redistribute_add(api.type, RIPNG_ROUTE_REDISTRIBUTE, &p,
				       ifindex, &nexthop, api.tag);
	else
		ripng_redistribute_delete(api.type, RIPNG_ROUTE_REDISTRIBUTE,
					  &p, ifindex);

	return 0;
}

void ripng_zclient_reset(void)
{
	zclient_reset(zclient);
}

static int ripng_redistribute_unset(int type)
{

	if (!vrf_bitmap_check(zclient->redist[AFI_IP6][type], VRF_DEFAULT))
		return CMD_SUCCESS;

	vrf_bitmap_set(zclient->redist[AFI_IP6][type], VRF_DEFAULT);

	if (zclient->sock > 0)
		zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient,
					AFI_IP6, type, 0, VRF_DEFAULT);

	ripng_redistribute_withdraw(type);

	return CMD_SUCCESS;
}

int ripng_redistribute_check(int type)
{
	return vrf_bitmap_check(zclient->redist[AFI_IP6][type], VRF_DEFAULT);
}

static void ripng_redistribute_metric_set(int type, int metric)
{
	ripng->route_map[type].metric_config = 1;
	ripng->route_map[type].metric = metric;
}

static int ripng_redistribute_metric_unset(int type)
{
	ripng->route_map[type].metric_config = 0;
	ripng->route_map[type].metric = 0;
	return 0;
}

static void ripng_redistribute_routemap_set(int type, const char *name)
{
	if (ripng->route_map[type].name)
		free(ripng->route_map[type].name);

	ripng->route_map[type].name = strdup(name);
	ripng->route_map[type].map = route_map_lookup_by_name(name);
}

static void ripng_redistribute_routemap_unset(int type)
{
	if (ripng->route_map[type].name)
		free(ripng->route_map[type].name);

	ripng->route_map[type].name = NULL;
	ripng->route_map[type].map = NULL;
}

/* Redistribution types */
static struct {
	int type;
	int str_min_len;
	const char *str;
} redist_type[] = {{ZEBRA_ROUTE_KERNEL, 1, "kernel"},
		   {ZEBRA_ROUTE_CONNECT, 1, "connected"},
		   {ZEBRA_ROUTE_STATIC, 1, "static"},
		   {ZEBRA_ROUTE_OSPF6, 1, "ospf6"},
		   {ZEBRA_ROUTE_BGP, 2, "bgp"},
		   {ZEBRA_ROUTE_VNC, 1, "vnc"},
		   {0, 0, NULL}};

void ripng_redistribute_clean()
{
	int i;

	for (i = 0; redist_type[i].str; i++) {
		if (vrf_bitmap_check(
			    zclient->redist[AFI_IP6][redist_type[i].type],
			    VRF_DEFAULT)) {
			if (zclient->sock > 0)
				zebra_redistribute_send(
					ZEBRA_REDISTRIBUTE_DELETE, zclient,
					AFI_IP6, redist_type[i].type, 0,
					VRF_DEFAULT);

			vrf_bitmap_unset(
				zclient->redist[AFI_IP6][redist_type[i].type],
				VRF_DEFAULT);

			/* Remove the routes from RIPng table. */
			ripng_redistribute_withdraw(redist_type[i].type);
		}
	}
}

DEFUN (ripng_redistribute_ripng,
       ripng_redistribute_ripng_cmd,
       "redistribute ripng",
       "Redistribute information from another routing protocol\n"
       "RIPng route\n")
{
	vrf_bitmap_set(zclient->redist[AFI_IP6][ZEBRA_ROUTE_RIPNG],
		       VRF_DEFAULT);
	return CMD_SUCCESS;
}

DEFUN (no_ripng_redistribute_ripng,
       no_ripng_redistribute_ripng_cmd,
       "no redistribute ripng",
       NO_STR
       "Redistribute information from another routing protocol\n"
       "RIPng route\n")
{
	vrf_bitmap_unset(zclient->redist[AFI_IP6][ZEBRA_ROUTE_RIPNG],
			 VRF_DEFAULT);
	return CMD_SUCCESS;
}

DEFUN (ripng_redistribute_type,
       ripng_redistribute_type_cmd,
       "redistribute " FRR_REDIST_STR_RIPNGD,
       "Redistribute\n"
       FRR_REDIST_HELP_STR_RIPNGD)
{
	int type;

	char *proto = argv[argc - 1]->text;
	type = proto_redistnum(AFI_IP6, proto);

	if (type < 0) {
		vty_out(vty, "Invalid type %s\n", proto);
		return CMD_WARNING_CONFIG_FAILED;
	}

	zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6, type, 0,
			     VRF_DEFAULT);
	return CMD_SUCCESS;
}

DEFUN (no_ripng_redistribute_type,
       no_ripng_redistribute_type_cmd,
       "no redistribute " FRR_REDIST_STR_RIPNGD " [metric (0-16)] [route-map WORD]",
       NO_STR
       "Redistribute\n"
       FRR_REDIST_HELP_STR_RIPNGD
       "Metric\n"
       "Metric value\n"
       "Route map reference\n"
       "Pointer to route-map entries\n")
{
	int type;

	char *proto = argv[2]->text;
	type = proto_redistnum(AFI_IP6, proto);

	if (type < 0) {
		vty_out(vty, "Invalid type %s\n", proto);
		return CMD_WARNING_CONFIG_FAILED;
	}

	ripng_redistribute_metric_unset(type);
	ripng_redistribute_routemap_unset(type);
	return ripng_redistribute_unset(type);
}


DEFUN (ripng_redistribute_type_metric,
       ripng_redistribute_type_metric_cmd,
       "redistribute " FRR_REDIST_STR_RIPNGD " metric (0-16)",
       "Redistribute\n"
       FRR_REDIST_HELP_STR_RIPNGD
       "Metric\n"
       "Metric value\n")
{
	int idx_protocol = 1;
	int idx_number = 3;
	int type;
	int metric;

	metric = atoi(argv[idx_number]->arg);
	type = proto_redistnum(AFI_IP6, argv[idx_protocol]->text);

	if (type < 0) {
		vty_out(vty, "Invalid type %s\n", argv[idx_protocol]->text);
		return CMD_WARNING_CONFIG_FAILED;
	}

	ripng_redistribute_metric_set(type, metric);
	zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6, type, 0,
			     VRF_DEFAULT);
	return CMD_SUCCESS;
}

DEFUN (ripng_redistribute_type_routemap,
       ripng_redistribute_type_routemap_cmd,
       "redistribute " FRR_REDIST_STR_RIPNGD " route-map WORD",
       "Redistribute\n"
       FRR_REDIST_HELP_STR_RIPNGD
       "Route map reference\n"
       "Pointer to route-map entries\n")
{
	int idx_protocol = 1;
	int idx_word = 3;
	int type;

	type = proto_redistnum(AFI_IP6, argv[idx_protocol]->text);

	if (type < 0) {
		vty_out(vty, "Invalid type %s\n", argv[idx_protocol]->text);
		return CMD_WARNING_CONFIG_FAILED;
	}

	ripng_redistribute_routemap_set(type, argv[idx_word]->text);
	zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6, type, 0,
			     VRF_DEFAULT);
	return CMD_SUCCESS;
}

DEFUN (ripng_redistribute_type_metric_routemap,
       ripng_redistribute_type_metric_routemap_cmd,
       "redistribute " FRR_REDIST_STR_RIPNGD " metric (0-16) route-map WORD",
       "Redistribute\n"
       FRR_REDIST_HELP_STR_RIPNGD
       "Metric\n"
       "Metric value\n"
       "Route map reference\n"
       "Pointer to route-map entries\n")
{
	int idx_protocol = 1;
	int idx_number = 3;
	int idx_word = 5;
	int type;
	int metric;

	type = proto_redistnum(AFI_IP6, argv[idx_protocol]->text);
	metric = atoi(argv[idx_number]->arg);

	if (type < 0) {
		vty_out(vty, "Invalid type %s\n", argv[idx_protocol]->text);
		return CMD_WARNING_CONFIG_FAILED;
	}

	ripng_redistribute_metric_set(type, metric);
	ripng_redistribute_routemap_set(type, argv[idx_word]->text);
	zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP6, type, 0,
			     VRF_DEFAULT);
	return CMD_SUCCESS;
}

void ripng_redistribute_write(struct vty *vty, int config_mode)
{
	int i;

	for (i = 0; i < ZEBRA_ROUTE_MAX; i++)
		if (i != zclient->redist_default
		    && vrf_bitmap_check(zclient->redist[AFI_IP6][i],
					VRF_DEFAULT)) {
			if (config_mode) {
				if (ripng->route_map[i].metric_config) {
					if (ripng->route_map[i].name)
						vty_out(vty,
							" redistribute %s metric %d route-map %s\n",
							zebra_route_string(i),
							ripng->route_map[i]
								.metric,
							ripng->route_map[i]
								.name);
					else
						vty_out(vty,
							" redistribute %s metric %d\n",
							zebra_route_string(i),
							ripng->route_map[i]
								.metric);
				} else {
					if (ripng->route_map[i].name)
						vty_out(vty,
							" redistribute %s route-map %s\n",
							zebra_route_string(i),
							ripng->route_map[i]
								.name);
					else
						vty_out(vty,
							" redistribute %s\n",
							zebra_route_string(i));
				}
			} else
				vty_out(vty, "    %s", zebra_route_string(i));
		}
}

/* RIPng configuration write function. */
static int zebra_config_write(struct vty *vty)
{
	if (!zclient->enable) {
		vty_out(vty, "no router zebra\n");
		return 1;
	} else if (!vrf_bitmap_check(
			   zclient->redist[AFI_IP6][ZEBRA_ROUTE_RIPNG],
			   VRF_DEFAULT)) {
		vty_out(vty, "router zebra\n");
		vty_out(vty, " no redistribute ripng\n");
		return 1;
	}
	return 0;
}

/* Zebra node structure. */
static struct cmd_node zebra_node = {
	ZEBRA_NODE,
	"%s(config-router)# ",
};

static void ripng_zebra_connected(struct zclient *zclient)
{
	zclient_send_reg_requests(zclient, VRF_DEFAULT);
}

/* Initialize zebra structure and it's commands. */
void zebra_init(struct thread_master *master)
{
	/* Allocate zebra structure. */
	zclient = zclient_new(master);
	zclient_init(zclient, ZEBRA_ROUTE_RIPNG, 0);

	zclient->zebra_connected = ripng_zebra_connected;
	zclient->interface_up = ripng_interface_up;
	zclient->interface_down = ripng_interface_down;
	zclient->interface_add = ripng_interface_add;
	zclient->interface_delete = ripng_interface_delete;
	zclient->interface_address_add = ripng_interface_address_add;
	zclient->interface_address_delete = ripng_interface_address_delete;
	zclient->redistribute_route_ipv6_add = ripng_zebra_read_ipv6;
	zclient->redistribute_route_ipv6_del = ripng_zebra_read_ipv6;

	/* Install zebra node. */
	install_node(&zebra_node, zebra_config_write);

	/* Install command element for zebra node. */
	install_default(ZEBRA_NODE);
	install_element(ZEBRA_NODE, &ripng_redistribute_ripng_cmd);
	install_element(ZEBRA_NODE, &no_ripng_redistribute_ripng_cmd);

	/* Install command elements to ripng node */
	install_element(RIPNG_NODE, &ripng_redistribute_type_cmd);
	install_element(RIPNG_NODE, &ripng_redistribute_type_routemap_cmd);
	install_element(RIPNG_NODE, &ripng_redistribute_type_metric_cmd);
	install_element(RIPNG_NODE,
			&ripng_redistribute_type_metric_routemap_cmd);
	install_element(RIPNG_NODE, &no_ripng_redistribute_type_cmd);
}

void ripng_zebra_stop(void)
{
	zclient_stop(zclient);
	zclient_free(zclient);
}