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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 "prefix.h"
#include "zclient.h"
#include "stream.h"
#include "network.h"
#include "thread.h"
#include "prefix.h"
#include "vty.h"
#include "lib_errors.h"
#include "pimd.h"
#include "pim_iface.h"
#include "pim_neighbor.h"
#include "pim_pim.h"
#include "pim_str.h"
#include "pim_oil.h"
#include "pim_zlookup.h"
static struct zclient *zlookup = NULL;
struct thread *zlookup_read;
static void zclient_lookup_sched(struct zclient *zlookup, int delay);
static int zclient_lookup_read_pipe(struct thread *thread);
/* Connect to zebra for nexthop lookup. */
static int zclient_lookup_connect(struct thread *t)
{
struct zclient *zlookup;
zlookup = THREAD_ARG(t);
if (zlookup->sock >= 0) {
return 0;
}
if (zclient_socket_connect(zlookup) < 0) {
++zlookup->fail;
zlog_warn("%s: failure connecting zclient socket: failures=%d",
__func__, zlookup->fail);
} else {
zlookup->fail = 0; /* reset counter on connection */
}
if (zclient_send_hello(zlookup) == ZCLIENT_SEND_FAILURE) {
if (close(zlookup->sock)) {
zlog_warn("%s: closing fd=%d: errno=%d %s", __func__,
zlookup->sock, errno, safe_strerror(errno));
}
zlookup->sock = -1;
}
if (zlookup->sock < 0) {
/* Since last connect failed, retry within 10 secs */
zclient_lookup_sched(zlookup, 10);
return -1;
}
thread_add_timer(router->master, zclient_lookup_read_pipe, zlookup, 60,
&zlookup_read);
return 0;
}
/* Schedule connection with delay. */
static void zclient_lookup_sched(struct zclient *zlookup, int delay)
{
thread_add_timer(router->master, zclient_lookup_connect, zlookup, delay,
&zlookup->t_connect);
zlog_notice("%s: zclient lookup connection scheduled for %d seconds",
__func__, delay);
}
/* Schedule connection for now. */
static void zclient_lookup_sched_now(struct zclient *zlookup)
{
thread_add_event(router->master, zclient_lookup_connect, zlookup, 0,
&zlookup->t_connect);
zlog_notice("%s: zclient lookup immediate connection scheduled",
__func__);
}
/* Schedule reconnection, if needed. */
static void zclient_lookup_reconnect(struct zclient *zlookup)
{
if (zlookup->t_connect) {
return;
}
zclient_lookup_sched_now(zlookup);
}
static void zclient_lookup_failed(struct zclient *zlookup)
{
if (zlookup->sock >= 0) {
if (close(zlookup->sock)) {
zlog_warn("%s: closing fd=%d: errno=%d %s", __func__,
zlookup->sock, errno, safe_strerror(errno));
}
zlookup->sock = -1;
}
zclient_lookup_reconnect(zlookup);
}
void zclient_lookup_free(void)
{
THREAD_OFF(zlookup_read);
zclient_stop(zlookup);
zclient_free(zlookup);
zlookup = NULL;
}
void zclient_lookup_new(void)
{
struct zclient_options options = zclient_options_default;
options.synchronous = true;
zlookup = zclient_new(router->master, &options);
if (!zlookup) {
flog_err(EC_LIB_ZAPI_SOCKET, "%s: zclient_new() failure",
__func__);
return;
}
zlookup->sock = -1;
zlookup->t_connect = NULL;
zlookup->privs = &pimd_privs;
zclient_lookup_sched_now(zlookup);
zlog_notice("%s: zclient lookup socket initialized", __func__);
}
static int zclient_read_nexthop(struct pim_instance *pim,
struct zclient *zlookup,
struct pim_zlookup_nexthop nexthop_tab[],
const int tab_size, struct in_addr addr)
{
int num_ifindex = 0;
struct stream *s;
uint16_t length;
uint8_t marker;
uint8_t version;
vrf_id_t vrf_id;
uint16_t command = 0;
struct in_addr raddr;
uint8_t distance;
uint32_t metric;
int nexthop_num;
int i, err;
if (PIM_DEBUG_PIM_NHT_DETAIL) {
char addr_str[INET_ADDRSTRLEN];
pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
zlog_debug("%s: addr=%s(%s)", __func__, addr_str,
pim->vrf->name);
}
s = zlookup->ibuf;
while (command != ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB) {
stream_reset(s);
err = zclient_read_header(s, zlookup->sock, &length, &marker,
&version, &vrf_id, &command);
if (err < 0) {
flog_err(EC_LIB_ZAPI_MISSMATCH,
"%s: zclient_read_header() failed", __func__);
zclient_lookup_failed(zlookup);
return -1;
}
if (command == ZEBRA_ERROR) {
enum zebra_error_types error;
zapi_error_decode(s, &error);
/* Do nothing with it for now */
return -1;
}
}
raddr.s_addr = stream_get_ipv4(s);
if (raddr.s_addr != addr.s_addr) {
char addr_str[INET_ADDRSTRLEN];
char raddr_str[INET_ADDRSTRLEN];
pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
pim_inet4_dump("<raddr?>", raddr, raddr_str, sizeof(raddr_str));
zlog_warn("%s: address mismatch: addr=%s(%s) raddr=%s",
__func__, addr_str, pim->vrf->name, raddr_str);
/* warning only */
}
distance = stream_getc(s);
metric = stream_getl(s);
nexthop_num = stream_getc(s);
if (nexthop_num < 1) {
if (PIM_DEBUG_PIM_NHT_DETAIL)
zlog_debug("%s: socket %d bad nexthop_num=%d", __func__,
zlookup->sock, nexthop_num);
return -6;
}
for (i = 0; i < nexthop_num; ++i) {
vrf_id_t nexthop_vrf_id;
enum nexthop_types_t nexthop_type;
struct pim_neighbor *nbr;
struct prefix p;
nexthop_vrf_id = stream_getl(s);
nexthop_type = stream_getc(s);
if (num_ifindex >= tab_size) {
char addr_str[INET_ADDRSTRLEN];
pim_inet4_dump("<addr?>", addr, addr_str,
sizeof(addr_str));
zlog_warn(
"%s: found too many nexthop ifindexes (%d > %d) for address %s(%s)",
__func__, (num_ifindex + 1), tab_size, addr_str,
pim->vrf->name);
return num_ifindex;
}
nexthop_tab[num_ifindex].protocol_distance = distance;
nexthop_tab[num_ifindex].route_metric = metric;
nexthop_tab[num_ifindex].vrf_id = nexthop_vrf_id;
switch (nexthop_type) {
case NEXTHOP_TYPE_IFINDEX:
nexthop_tab[num_ifindex].ifindex = stream_getl(s);
/*
* Connected route (i.e. no nexthop), use
* address passed in as PIM nexthop. This will
* allow us to work in cases where we are
* trying to find a route for this box.
*/
nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
nexthop_tab[num_ifindex].nexthop_addr.prefixlen =
IPV4_MAX_BITLEN;
nexthop_tab[num_ifindex].nexthop_addr.u.prefix4 =
addr;
++num_ifindex;
break;
case NEXTHOP_TYPE_IPV4_IFINDEX:
case NEXTHOP_TYPE_IPV4:
nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET;
nexthop_tab[num_ifindex].nexthop_addr.u.prefix4.s_addr =
stream_get_ipv4(s);
nexthop_tab[num_ifindex].ifindex = stream_getl(s);
++num_ifindex;
break;
case NEXTHOP_TYPE_IPV6_IFINDEX:
nexthop_tab[num_ifindex].nexthop_addr.family = AF_INET6;
stream_get(&nexthop_tab[num_ifindex]
.nexthop_addr.u.prefix6,
s, sizeof(struct in6_addr));
nexthop_tab[num_ifindex].ifindex = stream_getl(s);
p.family = AF_INET6;
p.prefixlen = IPV6_MAX_BITLEN;
memcpy(&p.u.prefix6,
&nexthop_tab[num_ifindex].nexthop_addr.u.prefix6,
sizeof(struct in6_addr));
/*
* If we are sending v6 secondary assume we receive v6
* secondary
*/
struct interface *ifp = if_lookup_by_index(
nexthop_tab[num_ifindex].ifindex,
nexthop_vrf_id);
if (!ifp)
nbr = NULL;
else if (pim->send_v6_secondary)
nbr = pim_neighbor_find_by_secondary(ifp, &p);
else
nbr = pim_neighbor_find_if(ifp);
if (nbr) {
nexthop_tab[num_ifindex].nexthop_addr.family =
AF_INET;
nexthop_tab[num_ifindex]
.nexthop_addr.u.prefix4 =
nbr->source_addr;
}
++num_ifindex;
break;
default:
/* do nothing */
{
char addr_str[INET_ADDRSTRLEN];
pim_inet4_dump("<addr?>", addr, addr_str,
sizeof(addr_str));
zlog_warn(
"%s: found non-ifindex nexthop type=%d for address %s(%s)",
__func__, nexthop_type, addr_str,
pim->vrf->name);
}
break;
}
}
return num_ifindex;
}
static int zclient_lookup_nexthop_once(struct pim_instance *pim,
struct pim_zlookup_nexthop nexthop_tab[],
const int tab_size, struct in_addr addr)
{
struct stream *s;
int ret;
if (PIM_DEBUG_PIM_NHT_DETAIL) {
char addr_str[INET_ADDRSTRLEN];
pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
zlog_debug("%s: addr=%s(%s)", __func__, addr_str,
pim->vrf->name);
}
/* Check socket. */
if (zlookup->sock < 0) {
flog_err(EC_LIB_ZAPI_SOCKET,
"%s: zclient lookup socket is not connected",
__func__);
zclient_lookup_failed(zlookup);
return -1;
}
if (pim->vrf->vrf_id == VRF_UNKNOWN) {
zlog_notice(
"%s: VRF: %s does not fully exist yet, delaying lookup",
__func__, pim->vrf->name);
return -1;
}
s = zlookup->obuf;
stream_reset(s);
zclient_create_header(s, ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB,
pim->vrf->vrf_id);
stream_put_in_addr(s, &addr);
stream_putw_at(s, 0, stream_get_endp(s));
ret = writen(zlookup->sock, s->data, stream_get_endp(s));
if (ret < 0) {
flog_err(
EC_LIB_SOCKET,
"%s: writen() failure: %d writing to zclient lookup socket",
__func__, errno);
zclient_lookup_failed(zlookup);
return -2;
}
if (ret == 0) {
flog_err_sys(EC_LIB_SOCKET,
"%s: connection closed on zclient lookup socket",
__func__);
zclient_lookup_failed(zlookup);
return -3;
}
return zclient_read_nexthop(pim, zlookup, nexthop_tab, tab_size, addr);
}
int zclient_lookup_read_pipe(struct thread *thread)
{
struct zclient *zlookup = THREAD_ARG(thread);
struct pim_instance *pim = pim_get_pim_instance(VRF_DEFAULT);
struct pim_zlookup_nexthop nexthop_tab[10];
struct in_addr l = {.s_addr = INADDR_ANY};
zclient_lookup_nexthop_once(pim, nexthop_tab, 10, l);
thread_add_timer(router->master, zclient_lookup_read_pipe, zlookup, 60,
&zlookup_read);
return 1;
}
int zclient_lookup_nexthop(struct pim_instance *pim,
struct pim_zlookup_nexthop nexthop_tab[],
const int tab_size, struct in_addr addr,
int max_lookup)
{
int lookup;
uint32_t route_metric = 0xFFFFFFFF;
uint8_t protocol_distance = 0xFF;
pim->nexthop_lookups++;
for (lookup = 0; lookup < max_lookup; ++lookup) {
int num_ifindex;
int first_ifindex;
struct prefix nexthop_addr;
num_ifindex = zclient_lookup_nexthop_once(pim, nexthop_tab,
tab_size, addr);
if (num_ifindex < 1) {
if (PIM_DEBUG_PIM_NHT) {
char addr_str[INET_ADDRSTRLEN];
pim_inet4_dump("<addr?>", addr, addr_str,
sizeof(addr_str));
zlog_debug(
"%s: lookup=%d/%d: could not find nexthop ifindex for address %s(%s)",
__func__, lookup, max_lookup, addr_str,
pim->vrf->name);
}
return -1;
}
if (lookup < 1) {
/* this is the non-recursive lookup - save original
* metric/distance */
route_metric = nexthop_tab[0].route_metric;
protocol_distance = nexthop_tab[0].protocol_distance;
}
/*
* FIXME: Non-recursive nexthop ensured only for first ifindex.
* However, recursive route lookup should really be fixed in
* zebra daemon.
* See also TODO T24.
*
* So Zebra for NEXTHOP_TYPE_IPV4 returns the ifindex now since
* it was being stored. This Doesn't solve all cases of
* recursive lookup but for the most common types it does.
*/
first_ifindex = nexthop_tab[0].ifindex;
nexthop_addr = nexthop_tab[0].nexthop_addr;
if (first_ifindex > 0) {
/* found: first ifindex is non-recursive nexthop */
if (lookup > 0) {
/* Report non-recursive success after first
* lookup */
if (PIM_DEBUG_PIM_NHT) {
char addr_str[INET_ADDRSTRLEN];
pim_inet4_dump("<addr?>", addr,
addr_str,
sizeof(addr_str));
zlog_debug(
"%s: lookup=%d/%d: found non-recursive ifindex=%d for address %s(%s) dist=%d met=%d",
__func__, lookup, max_lookup,
first_ifindex, addr_str,
pim->vrf->name,
nexthop_tab[0]
.protocol_distance,
nexthop_tab[0].route_metric);
}
/* use last address as nexthop address */
nexthop_tab[0].nexthop_addr.u.prefix4 = addr;
/* report original route metric/distance */
nexthop_tab[0].route_metric = route_metric;
nexthop_tab[0].protocol_distance =
protocol_distance;
}
return num_ifindex;
}
if (PIM_DEBUG_PIM_NHT) {
char addr_str[INET_ADDRSTRLEN];
char nexthop_str[PREFIX_STRLEN];
pim_inet4_dump("<addr?>", addr, addr_str,
sizeof(addr_str));
pim_addr_dump("<nexthop?>", &nexthop_addr, nexthop_str,
sizeof(nexthop_str));
zlog_debug(
"%s: lookup=%d/%d: zebra returned recursive nexthop %s for address %s(%s) dist=%d met=%d",
__func__, lookup, max_lookup, nexthop_str,
addr_str, pim->vrf->name,
nexthop_tab[0].protocol_distance,
nexthop_tab[0].route_metric);
}
addr = nexthop_addr.u.prefix4; /* use nexthop addr for
recursive lookup */
} /* for (max_lookup) */
if (PIM_DEBUG_PIM_NHT) {
char addr_str[INET_ADDRSTRLEN];
pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
zlog_warn(
"%s: lookup=%d/%d: failure searching recursive nexthop ifindex for address %s(%s)",
__func__, lookup, max_lookup, addr_str, pim->vrf->name);
}
return -2;
}
void pim_zlookup_show_ip_multicast(struct vty *vty)
{
vty_out(vty, "Zclient lookup socket: ");
if (zlookup) {
vty_out(vty, "%d failures=%d\n", zlookup->sock, zlookup->fail);
} else {
vty_out(vty, "<null zclient>\n");
}
}
int pim_zlookup_sg_statistics(struct channel_oil *c_oil)
{
struct stream *s = zlookup->obuf;
uint16_t command = 0;
unsigned long long lastused;
struct prefix_sg sg;
int count = 0;
int ret;
struct interface *ifp =
pim_if_find_by_vif_index(c_oil->pim, c_oil->oil.mfcc_parent);
if (PIM_DEBUG_ZEBRA) {
struct prefix_sg more;
more.src = c_oil->oil.mfcc_origin;
more.grp = c_oil->oil.mfcc_mcastgrp;
zlog_debug(
"Sending Request for New Channel Oil Information%s VIIF %d(%s)",
pim_str_sg_dump(&more), c_oil->oil.mfcc_parent,
c_oil->pim->vrf->name);
}
if (!ifp)
return -1;
stream_reset(s);
zclient_create_header(s, ZEBRA_IPMR_ROUTE_STATS,
c_oil->pim->vrf->vrf_id);
stream_put_in_addr(s, &c_oil->oil.mfcc_origin);
stream_put_in_addr(s, &c_oil->oil.mfcc_mcastgrp);
stream_putl(s, ifp->ifindex);
stream_putw_at(s, 0, stream_get_endp(s));
count = stream_get_endp(s);
ret = writen(zlookup->sock, s->data, count);
if (ret <= 0) {
flog_err(
EC_LIB_SOCKET,
"%s: writen() failure: %d writing to zclient lookup socket",
__func__, errno);
return -1;
}
s = zlookup->ibuf;
while (command != ZEBRA_IPMR_ROUTE_STATS) {
int err;
uint16_t length = 0;
vrf_id_t vrf_id;
uint8_t marker;
uint8_t version;
stream_reset(s);
err = zclient_read_header(s, zlookup->sock, &length, &marker,
&version, &vrf_id, &command);
if (err < 0) {
flog_err(EC_LIB_ZAPI_MISSMATCH,
"%s: zclient_read_header() failed", __func__);
zclient_lookup_failed(zlookup);
return -1;
}
}
sg.src.s_addr = stream_get_ipv4(s);
sg.grp.s_addr = stream_get_ipv4(s);
if (sg.src.s_addr != c_oil->oil.mfcc_origin.s_addr
|| sg.grp.s_addr != c_oil->oil.mfcc_mcastgrp.s_addr) {
if (PIM_DEBUG_ZEBRA) {
struct prefix_sg more;
more.src = c_oil->oil.mfcc_origin;
more.grp = c_oil->oil.mfcc_mcastgrp;
flog_err(
EC_LIB_ZAPI_MISSMATCH,
"%s: Received wrong %s(%s) information requested",
__func__, pim_str_sg_dump(&more),
c_oil->pim->vrf->name);
}
zclient_lookup_failed(zlookup);
return -3;
}
stream_get(&lastused, s, sizeof(lastused));
/* signed success value from netlink_talk; currently unused */
(void)stream_getl(s);
c_oil->cc.lastused = lastused;
return 0;
}
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