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lde.c
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/* $OpenBSD$ */
/*
* Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org>
* Copyright (c) 2004, 2005 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2004 Esben Norby <norby@openbsd.org>
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <zebra.h>
#include "ldp.h"
#include "ldpd.h"
#include "ldpe.h"
#include "log.h"
#include "lde.h"
#include "ldp_debug.h"
#include <lib/log.h>
#include "memory.h"
#include "privs.h"
#include "sigevent.h"
#include "mpls.h"
#include <lib/linklist.h>
#include "zclient.h"
#include "stream.h"
#include "network.h"
#include "libfrr.h"
static void lde_shutdown(void);
static int lde_dispatch_imsg(struct thread *);
static int lde_dispatch_parent(struct thread *);
static __inline int lde_nbr_compare(const struct lde_nbr *,
const struct lde_nbr *);
static struct lde_nbr *lde_nbr_new(uint32_t, struct lde_nbr *);
static void lde_nbr_del(struct lde_nbr *);
static struct lde_nbr *lde_nbr_find(uint32_t);
static void lde_nbr_clear(void);
static void lde_nbr_addr_update(struct lde_nbr *,
struct lde_addr *, int);
static __inline int lde_map_compare(const struct lde_map *,
const struct lde_map *);
static void lde_map_free(void *);
static int lde_address_add(struct lde_nbr *, struct lde_addr *);
static int lde_address_del(struct lde_nbr *, struct lde_addr *);
static void lde_address_list_free(struct lde_nbr *);
static void zclient_sync_init(void);
static void lde_label_list_init(void);
static int lde_get_label_chunk(void);
static void on_get_label_chunk_response(uint32_t start, uint32_t end);
static uint32_t lde_get_next_label(void);
static bool lde_fec_connected(const struct fec_node *);
static bool lde_fec_outside_mpls_network(const struct fec_node *);
static void lde_check_filter_af(int, struct ldpd_af_conf *,
const char *);
RB_GENERATE(nbr_tree, lde_nbr, entry, lde_nbr_compare)
RB_GENERATE(lde_map_head, lde_map, entry, lde_map_compare)
struct ldpd_conf *ldeconf;
struct nbr_tree lde_nbrs = RB_INITIALIZER(&lde_nbrs);
static struct imsgev *iev_ldpe;
static struct imsgev *iev_main, *iev_main_sync;
/* lde privileges */
static zebra_capabilities_t _caps_p [] =
{
ZCAP_NET_ADMIN
};
static struct zebra_privs_t lde_privs =
{
#if defined(VTY_GROUP)
.vty_group = VTY_GROUP,
#endif
.caps_p = _caps_p,
.cap_num_p = array_size(_caps_p),
.cap_num_i = 0
};
/* List of chunks of labels externally assigned by Zebra */
static struct list *label_chunk_list;
static struct listnode *current_label_chunk;
/* Synchronous zclient to request labels */
static struct zclient *zclient_sync;
/* SIGINT / SIGTERM handler. */
static void
sigint(void)
{
lde_shutdown();
}
static struct quagga_signal_t lde_signals[] =
{
{
.signal = SIGHUP,
/* ignore */
},
{
.signal = SIGINT,
.handler = &sigint,
},
{
.signal = SIGTERM,
.handler = &sigint,
},
};
/* label decision engine */
void
lde(void)
{
struct thread thread;
#ifdef HAVE_SETPROCTITLE
setproctitle("label decision engine");
#endif
ldpd_process = PROC_LDE_ENGINE;
log_procname = log_procnames[PROC_LDE_ENGINE];
master = thread_master_create(NULL);
/* setup signal handler */
signal_init(master, array_size(lde_signals), lde_signals);
/* setup pipes and event handlers to the parent process */
if ((iev_main = calloc(1, sizeof(struct imsgev))) == NULL)
fatal(NULL);
imsg_init(&iev_main->ibuf, LDPD_FD_ASYNC);
iev_main->handler_read = lde_dispatch_parent;
iev_main->ev_read = NULL;
thread_add_read(master, iev_main->handler_read, iev_main, iev_main->ibuf.fd,
&iev_main->ev_read);
iev_main->handler_write = ldp_write_handler;
if ((iev_main_sync = calloc(1, sizeof(struct imsgev))) == NULL)
fatal(NULL);
imsg_init(&iev_main_sync->ibuf, LDPD_FD_SYNC);
/* create base configuration */
ldeconf = config_new_empty();
/* Fetch next active thread. */
while (thread_fetch(master, &thread))
thread_call(&thread);
}
void
lde_init(struct ldpd_init *init)
{
/* drop privileges */
lde_privs.user = init->user;
lde_privs.group = init->group;
zprivs_preinit(&lde_privs);
zprivs_init(&lde_privs);
/* start the LIB garbage collector */
lde_gc_start_timer();
/* Init synchronous zclient and label list */
frr_zclient_addr(&zclient_addr, &zclient_addr_len,
init->zclient_serv_path);
zclient_sync_init();
}
static void
lde_shutdown(void)
{
/* close pipes */
if (iev_ldpe) {
msgbuf_clear(&iev_ldpe->ibuf.w);
close(iev_ldpe->ibuf.fd);
iev_ldpe->ibuf.fd = -1;
}
msgbuf_clear(&iev_main->ibuf.w);
close(iev_main->ibuf.fd);
iev_main->ibuf.fd = -1;
msgbuf_clear(&iev_main_sync->ibuf.w);
close(iev_main_sync->ibuf.fd);
iev_main_sync->ibuf.fd = -1;
lde_gc_stop_timer();
lde_nbr_clear();
fec_tree_clear();
config_clear(ldeconf);
if (iev_ldpe)
free(iev_ldpe);
free(iev_main);
free(iev_main_sync);
log_info("label decision engine exiting");
zlog_fini();
exit(0);
}
/* imesg */
int
lde_imsg_compose_parent(int type, pid_t pid, void *data, uint16_t datalen)
{
if (iev_main->ibuf.fd == -1)
return (0);
return (imsg_compose_event(iev_main, type, 0, pid, -1, data, datalen));
}
void
lde_imsg_compose_parent_sync(int type, pid_t pid, void *data, uint16_t datalen)
{
if (iev_main_sync->ibuf.fd == -1)
return;
imsg_compose_event(iev_main_sync, type, 0, pid, -1, data, datalen);
imsg_flush(&iev_main_sync->ibuf);
}
int
lde_imsg_compose_ldpe(int type, uint32_t peerid, pid_t pid, void *data,
uint16_t datalen)
{
if (iev_ldpe->ibuf.fd == -1)
return (0);
return (imsg_compose_event(iev_ldpe, type, peerid, pid,
-1, data, datalen));
}
/* ARGSUSED */
static int
lde_dispatch_imsg(struct thread *thread)
{
struct imsgev *iev = THREAD_ARG(thread);
struct imsgbuf *ibuf = &iev->ibuf;
struct imsg imsg;
struct lde_nbr *ln;
struct map *map;
struct lde_addr *lde_addr;
struct notify_msg *nm;
ssize_t n;
int shut = 0;
iev->ev_read = NULL;
if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
fatal("imsg_read error");
if (n == 0) /* connection closed */
shut = 1;
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("lde_dispatch_imsg: imsg_get error");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_LABEL_MAPPING_FULL:
ln = lde_nbr_find(imsg.hdr.peerid);
if (ln == NULL) {
log_debug("%s: cannot find lde neighbor",
__func__);
break;
}
fec_snap(ln);
break;
case IMSG_LABEL_MAPPING:
case IMSG_LABEL_REQUEST:
case IMSG_LABEL_RELEASE:
case IMSG_LABEL_WITHDRAW:
case IMSG_LABEL_ABORT:
if (imsg.hdr.len - IMSG_HEADER_SIZE !=
sizeof(struct map))
fatalx("lde_dispatch_imsg: wrong imsg len");
map = imsg.data;
ln = lde_nbr_find(imsg.hdr.peerid);
if (ln == NULL) {
log_debug("%s: cannot find lde neighbor",
__func__);
break;
}
switch (imsg.hdr.type) {
case IMSG_LABEL_MAPPING:
lde_check_mapping(map, ln, 1);
break;
case IMSG_LABEL_REQUEST:
lde_check_request(map, ln);
break;
case IMSG_LABEL_RELEASE:
lde_check_release(map, ln);
break;
case IMSG_LABEL_WITHDRAW:
lde_check_withdraw(map, ln);
break;
case IMSG_LABEL_ABORT:
/* not necessary */
break;
}
break;
case IMSG_ADDRESS_ADD:
if (imsg.hdr.len - IMSG_HEADER_SIZE !=
sizeof(struct lde_addr))
fatalx("lde_dispatch_imsg: wrong imsg len");
lde_addr = imsg.data;
ln = lde_nbr_find(imsg.hdr.peerid);
if (ln == NULL) {
log_debug("%s: cannot find lde neighbor",
__func__);
break;
}
if (lde_address_add(ln, lde_addr) < 0) {
log_debug("%s: cannot add address %s, it already exists", __func__,
log_addr(lde_addr->af, &lde_addr->addr));
}
break;
case IMSG_ADDRESS_DEL:
if (imsg.hdr.len - IMSG_HEADER_SIZE !=
sizeof(struct lde_addr))
fatalx("lde_dispatch_imsg: wrong imsg len");
lde_addr = imsg.data;
ln = lde_nbr_find(imsg.hdr.peerid);
if (ln == NULL) {
log_debug("%s: cannot find lde neighbor",
__func__);
break;
}
if (lde_address_del(ln, lde_addr) < 0) {
log_debug("%s: cannot delete address %s, it does not exist", __func__,
log_addr(lde_addr->af, &lde_addr->addr));
}
break;
case IMSG_NOTIFICATION:
if (imsg.hdr.len - IMSG_HEADER_SIZE !=
sizeof(struct notify_msg))
fatalx("lde_dispatch_imsg: wrong imsg len");
nm = imsg.data;
ln = lde_nbr_find(imsg.hdr.peerid);
if (ln == NULL) {
log_debug("%s: cannot find lde neighbor",
__func__);
break;
}
switch (nm->status_code) {
case S_PW_STATUS:
l2vpn_recv_pw_status(ln, nm);
break;
case S_ENDOFLIB:
/*
* Do nothing for now. Should be useful in
* the future when we implement LDP-IGP
* Synchronization (RFC 5443) and Graceful
* Restart (RFC 3478).
*/
default:
break;
}
break;
case IMSG_NEIGHBOR_UP:
if (imsg.hdr.len - IMSG_HEADER_SIZE !=
sizeof(struct lde_nbr))
fatalx("lde_dispatch_imsg: wrong imsg len");
if (lde_nbr_find(imsg.hdr.peerid))
fatalx("lde_dispatch_imsg: neighbor already exists");
lde_nbr_new(imsg.hdr.peerid, imsg.data);
break;
case IMSG_NEIGHBOR_DOWN:
lde_nbr_del(lde_nbr_find(imsg.hdr.peerid));
break;
case IMSG_CTL_SHOW_LIB:
rt_dump(imsg.hdr.pid);
lde_imsg_compose_ldpe(IMSG_CTL_END, 0,
imsg.hdr.pid, NULL, 0);
break;
case IMSG_CTL_SHOW_L2VPN_PW:
l2vpn_pw_ctl(imsg.hdr.pid);
lde_imsg_compose_ldpe(IMSG_CTL_END, 0,
imsg.hdr.pid, NULL, 0);
break;
case IMSG_CTL_SHOW_L2VPN_BINDING:
l2vpn_binding_ctl(imsg.hdr.pid);
lde_imsg_compose_ldpe(IMSG_CTL_END, 0,
imsg.hdr.pid, NULL, 0);
break;
default:
log_debug("%s: unexpected imsg %d", __func__,
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
if (!shut)
imsg_event_add(iev);
else {
/* this pipe is dead, so remove the event handlers and exit */
THREAD_READ_OFF(iev->ev_read);
THREAD_WRITE_OFF(iev->ev_write);
lde_shutdown();
}
return (0);
}
/* ARGSUSED */
static int
lde_dispatch_parent(struct thread *thread)
{
static struct ldpd_conf *nconf;
struct iface *iface, *niface;
struct tnbr *ntnbr;
struct nbr_params *nnbrp;
static struct l2vpn *l2vpn, *nl2vpn;
struct l2vpn_if *lif, *nlif;
struct l2vpn_pw *pw, *npw;
struct imsg imsg;
struct kif *kif;
struct kroute *kr;
int fd;
struct imsgev *iev = THREAD_ARG(thread);
struct imsgbuf *ibuf = &iev->ibuf;
ssize_t n;
int shut = 0;
struct fec fec;
struct ldp_access *laccess;
iev->ev_read = NULL;
if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
fatal("imsg_read error");
if (n == 0) /* connection closed */
shut = 1;
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("lde_dispatch_parent: imsg_get error");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_IFSTATUS:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct kif))
fatalx("IFSTATUS imsg with wrong len");
kif = imsg.data;
iface = if_lookup_name(ldeconf, kif->ifname);
if (iface) {
if_update_info(iface, kif);
break;
}
RB_FOREACH(l2vpn, l2vpn_head, &ldeconf->l2vpn_tree) {
lif = l2vpn_if_find(l2vpn, kif->ifname);
if (lif) {
l2vpn_if_update_info(lif, kif);
break;
}
pw = l2vpn_pw_find(l2vpn, kif->ifname);
if (pw) {
l2vpn_pw_update_info(pw, kif);
break;
}
}
break;
case IMSG_PW_UPDATE:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct zapi_pw_status))
fatalx("PW_UPDATE imsg with wrong len");
if (l2vpn_pw_status_update(imsg.data) != 0)
log_warnx("%s: error updating PW status",
__func__);
break;
case IMSG_NETWORK_ADD:
case IMSG_NETWORK_UPDATE:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct kroute)) {
log_warnx("%s: wrong imsg len", __func__);
break;
}
kr = imsg.data;
switch (kr->af) {
case AF_INET:
fec.type = FEC_TYPE_IPV4;
fec.u.ipv4.prefix = kr->prefix.v4;
fec.u.ipv4.prefixlen = kr->prefixlen;
break;
case AF_INET6:
fec.type = FEC_TYPE_IPV6;
fec.u.ipv6.prefix = kr->prefix.v6;
fec.u.ipv6.prefixlen = kr->prefixlen;
break;
default:
fatalx("lde_dispatch_parent: unknown af");
}
switch (imsg.hdr.type) {
case IMSG_NETWORK_ADD:
lde_kernel_insert(&fec, kr->af, &kr->nexthop,
kr->ifindex, kr->route_type,
kr->route_instance,
kr->flags & F_CONNECTED, NULL);
break;
case IMSG_NETWORK_UPDATE:
lde_kernel_update(&fec);
break;
}
break;
case IMSG_SOCKET_IPC:
if (iev_ldpe) {
log_warnx("%s: received unexpected imsg fd to ldpe", __func__);
break;
}
if ((fd = imsg.fd) == -1) {
log_warnx("%s: expected to receive imsg fd to ldpe but didn't receive any", __func__);
break;
}
if ((iev_ldpe = malloc(sizeof(struct imsgev))) == NULL)
fatal(NULL);
imsg_init(&iev_ldpe->ibuf, fd);
iev_ldpe->handler_read = lde_dispatch_imsg;
iev_ldpe->ev_read = NULL;
thread_add_read(master, iev_ldpe->handler_read, iev_ldpe, iev_ldpe->ibuf.fd,
&iev_ldpe->ev_read);
iev_ldpe->handler_write = ldp_write_handler;
iev_ldpe->ev_write = NULL;
break;
case IMSG_INIT:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct ldpd_init))
fatalx("INIT imsg with wrong len");
memcpy(&init, imsg.data, sizeof(init));
lde_init(&init);
break;
case IMSG_RECONF_CONF:
if ((nconf = malloc(sizeof(struct ldpd_conf))) ==
NULL)
fatal(NULL);
memcpy(nconf, imsg.data, sizeof(struct ldpd_conf));
RB_INIT(iface_head, &nconf->iface_tree);
RB_INIT(tnbr_head, &nconf->tnbr_tree);
RB_INIT(nbrp_head, &nconf->nbrp_tree);
RB_INIT(l2vpn_head, &nconf->l2vpn_tree);
break;
case IMSG_RECONF_IFACE:
if ((niface = malloc(sizeof(struct iface))) == NULL)
fatal(NULL);
memcpy(niface, imsg.data, sizeof(struct iface));
RB_INSERT(iface_head, &nconf->iface_tree, niface);
break;
case IMSG_RECONF_TNBR:
if ((ntnbr = malloc(sizeof(struct tnbr))) == NULL)
fatal(NULL);
memcpy(ntnbr, imsg.data, sizeof(struct tnbr));
RB_INSERT(tnbr_head, &nconf->tnbr_tree, ntnbr);
break;
case IMSG_RECONF_NBRP:
if ((nnbrp = malloc(sizeof(struct nbr_params))) == NULL)
fatal(NULL);
memcpy(nnbrp, imsg.data, sizeof(struct nbr_params));
RB_INSERT(nbrp_head, &nconf->nbrp_tree, nnbrp);
break;
case IMSG_RECONF_L2VPN:
if ((nl2vpn = malloc(sizeof(struct l2vpn))) == NULL)
fatal(NULL);
memcpy(nl2vpn, imsg.data, sizeof(struct l2vpn));
RB_INIT(l2vpn_if_head, &nl2vpn->if_tree);
RB_INIT(l2vpn_pw_head, &nl2vpn->pw_tree);
RB_INIT(l2vpn_pw_head, &nl2vpn->pw_inactive_tree);
RB_INSERT(l2vpn_head, &nconf->l2vpn_tree, nl2vpn);
break;
case IMSG_RECONF_L2VPN_IF:
if ((nlif = malloc(sizeof(struct l2vpn_if))) == NULL)
fatal(NULL);
memcpy(nlif, imsg.data, sizeof(struct l2vpn_if));
RB_INSERT(l2vpn_if_head, &nl2vpn->if_tree, nlif);
break;
case IMSG_RECONF_L2VPN_PW:
if ((npw = malloc(sizeof(struct l2vpn_pw))) == NULL)
fatal(NULL);
memcpy(npw, imsg.data, sizeof(struct l2vpn_pw));
RB_INSERT(l2vpn_pw_head, &nl2vpn->pw_tree, npw);
break;
case IMSG_RECONF_L2VPN_IPW:
if ((npw = malloc(sizeof(struct l2vpn_pw))) == NULL)
fatal(NULL);
memcpy(npw, imsg.data, sizeof(struct l2vpn_pw));
RB_INSERT(l2vpn_pw_head, &nl2vpn->pw_inactive_tree, npw);
break;
case IMSG_RECONF_END:
merge_config(ldeconf, nconf);
ldp_clear_config(nconf);
nconf = NULL;
break;
case IMSG_DEBUG_UPDATE:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(ldp_debug)) {
log_warnx("%s: wrong imsg len", __func__);
break;
}
memcpy(&ldp_debug, imsg.data, sizeof(ldp_debug));
break;
case IMSG_FILTER_UPDATE:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct ldp_access)) {
log_warnx("%s: wrong imsg len", __func__);
break;
}
laccess = imsg.data;
lde_check_filter_af(AF_INET, &ldeconf->ipv4,
laccess->name);
lde_check_filter_af(AF_INET6, &ldeconf->ipv6,
laccess->name);
break;
default:
log_debug("%s: unexpected imsg %d", __func__,
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
if (!shut)
imsg_event_add(iev);
else {
/* this pipe is dead, so remove the event handlers and exit */
THREAD_READ_OFF(iev->ev_read);
THREAD_WRITE_OFF(iev->ev_write);
lde_shutdown();
}
return (0);
}
int
lde_acl_check(char *acl_name, int af, union ldpd_addr *addr, uint8_t prefixlen)
{
return ldp_acl_request(iev_main_sync, acl_name, af, addr, prefixlen);
}
static bool lde_fec_connected(const struct fec_node *fn)
{
struct fec_nh *fnh;
LIST_FOREACH(fnh, &fn->nexthops, entry)
if (fnh->flags & F_FEC_NH_CONNECTED)
return true;
return false;
}
static bool lde_fec_outside_mpls_network(const struct fec_node *fn)
{
struct fec_nh *fnh;
LIST_FOREACH(fnh, &fn->nexthops, entry)
if (!(fnh->flags & F_FEC_NH_NO_LDP))
return false;
return true;
}
uint32_t
lde_update_label(struct fec_node *fn)
{
/* should we allocate a label for this fec? */
switch (fn->fec.type) {
case FEC_TYPE_IPV4:
if ((ldeconf->ipv4.flags & F_LDPD_AF_ALLOCHOSTONLY) &&
fn->fec.u.ipv4.prefixlen != 32)
return (NO_LABEL);
if (lde_acl_check(ldeconf->ipv4.acl_label_allocate_for,
AF_INET, (union ldpd_addr *)&fn->fec.u.ipv4.prefix,
fn->fec.u.ipv4.prefixlen) != FILTER_PERMIT)
return (NO_LABEL);
break;
case FEC_TYPE_IPV6:
if ((ldeconf->ipv6.flags & F_LDPD_AF_ALLOCHOSTONLY) &&
fn->fec.u.ipv6.prefixlen != 128)
return (NO_LABEL);
if (lde_acl_check(ldeconf->ipv6.acl_label_allocate_for,
AF_INET6, (union ldpd_addr *)&fn->fec.u.ipv6.prefix,
fn->fec.u.ipv6.prefixlen) != FILTER_PERMIT)
return (NO_LABEL);
break;
default:
break;
}
/*
* If connected interface act as egress for fec.
* If LDP is not configured on an interface but there
* are other NHs with interfaces configured with LDP
* then don't act as an egress for the fec, otherwise
* act as an egress for the fec
*/
if (lde_fec_connected(fn) || lde_fec_outside_mpls_network(fn)) {
/* choose implicit or explicit-null depending on configuration */
switch (fn->fec.type) {
case FEC_TYPE_IPV4:
if (!(ldeconf->ipv4.flags & F_LDPD_AF_EXPNULL))
return (MPLS_LABEL_IMPLICIT_NULL);
if (lde_acl_check(ldeconf->ipv4.acl_label_expnull_for,
AF_INET, (union ldpd_addr *)&fn->fec.u.ipv4.prefix,
fn->fec.u.ipv4.prefixlen) != FILTER_PERMIT)
return (MPLS_LABEL_IMPLICIT_NULL);
return MPLS_LABEL_IPV4_EXPLICIT_NULL;
case FEC_TYPE_IPV6:
if (!(ldeconf->ipv6.flags & F_LDPD_AF_EXPNULL))
return (MPLS_LABEL_IMPLICIT_NULL);
if (lde_acl_check(ldeconf->ipv6.acl_label_expnull_for,
AF_INET6, (union ldpd_addr *)&fn->fec.u.ipv6.prefix,
fn->fec.u.ipv6.prefixlen) != FILTER_PERMIT)
return (MPLS_LABEL_IMPLICIT_NULL);
return MPLS_LABEL_IPV6_EXPLICIT_NULL;
default:
break;
}
}
/* preserve current label if there's no need to update it */
if (fn->local_label != NO_LABEL &&
fn->local_label > MPLS_LABEL_RESERVED_MAX)
return (fn->local_label);
return (lde_get_next_label());
}
void
lde_send_change_klabel(struct fec_node *fn, struct fec_nh *fnh)
{
struct kroute kr;
struct zapi_pw zpw;
struct l2vpn_pw *pw;
/*
* Ordered Control: don't program label into HW until a
* labelmap msg has been received from upstream router
*/
if (fnh->flags & F_FEC_NH_DEFER)
return;
switch (fn->fec.type) {
case FEC_TYPE_IPV4:
memset(&kr, 0, sizeof(kr));
kr.af = AF_INET;
kr.prefix.v4 = fn->fec.u.ipv4.prefix;
kr.prefixlen = fn->fec.u.ipv4.prefixlen;
kr.nexthop.v4 = fnh->nexthop.v4;
kr.ifindex = fnh->ifindex;
kr.local_label = fn->local_label;
kr.remote_label = fnh->remote_label;
kr.route_type = fnh->route_type;
kr.route_instance = fnh->route_instance;
lde_imsg_compose_parent(IMSG_KLABEL_CHANGE, 0, &kr,
sizeof(kr));
break;
case FEC_TYPE_IPV6:
memset(&kr, 0, sizeof(kr));
kr.af = AF_INET6;
kr.prefix.v6 = fn->fec.u.ipv6.prefix;
kr.prefixlen = fn->fec.u.ipv6.prefixlen;
kr.nexthop.v6 = fnh->nexthop.v6;
kr.ifindex = fnh->ifindex;
kr.local_label = fn->local_label;
kr.remote_label = fnh->remote_label;
kr.route_type = fnh->route_type;
kr.route_instance = fnh->route_instance;
lde_imsg_compose_parent(IMSG_KLABEL_CHANGE, 0, &kr,
sizeof(kr));
break;
case FEC_TYPE_PWID:
pw = (struct l2vpn_pw *) fn->data;
if (!pw || fn->local_label == NO_LABEL ||
fnh->remote_label == NO_LABEL)
return;
pw->enabled = true;
pw2zpw(pw, &zpw);
zpw.local_label = fn->local_label;
zpw.remote_label = fnh->remote_label;
lde_imsg_compose_parent(IMSG_KPW_SET, 0, &zpw, sizeof(zpw));
break;
}
}
void
lde_send_delete_klabel(struct fec_node *fn, struct fec_nh *fnh)
{
struct kroute kr;
struct zapi_pw zpw;
struct l2vpn_pw *pw;
switch (fn->fec.type) {
case FEC_TYPE_IPV4:
memset(&kr, 0, sizeof(kr));
kr.af = AF_INET;
kr.prefix.v4 = fn->fec.u.ipv4.prefix;
kr.prefixlen = fn->fec.u.ipv4.prefixlen;
kr.nexthop.v4 = fnh->nexthop.v4;
kr.ifindex = fnh->ifindex;
kr.local_label = fn->local_label;
kr.remote_label = fnh->remote_label;
kr.route_type = fnh->route_type;
kr.route_instance = fnh->route_instance;
lde_imsg_compose_parent(IMSG_KLABEL_DELETE, 0, &kr,
sizeof(kr));
break;
case FEC_TYPE_IPV6:
memset(&kr, 0, sizeof(kr));
kr.af = AF_INET6;
kr.prefix.v6 = fn->fec.u.ipv6.prefix;
kr.prefixlen = fn->fec.u.ipv6.prefixlen;
kr.nexthop.v6 = fnh->nexthop.v6;
kr.ifindex = fnh->ifindex;
kr.local_label = fn->local_label;
kr.remote_label = fnh->remote_label;
kr.route_type = fnh->route_type;
kr.route_instance = fnh->route_instance;
lde_imsg_compose_parent(IMSG_KLABEL_DELETE, 0, &kr,
sizeof(kr));
break;
case FEC_TYPE_PWID:
pw = (struct l2vpn_pw *) fn->data;
if (!pw)
return;
pw->enabled = false;
pw2zpw(pw, &zpw);
zpw.local_label = fn->local_label;
zpw.remote_label = fnh->remote_label;
lde_imsg_compose_parent(IMSG_KPW_UNSET, 0, &zpw, sizeof(zpw));
break;
}
}
void
lde_fec2map(struct fec *fec, struct map *map)
{
memset(map, 0, sizeof(*map));
switch (fec->type) {
case FEC_TYPE_IPV4:
map->type = MAP_TYPE_PREFIX;
map->fec.prefix.af = AF_INET;
map->fec.prefix.prefix.v4 = fec->u.ipv4.prefix;
map->fec.prefix.prefixlen = fec->u.ipv4.prefixlen;
break;
case FEC_TYPE_IPV6:
map->type = MAP_TYPE_PREFIX;
map->fec.prefix.af = AF_INET6;
map->fec.prefix.prefix.v6 = fec->u.ipv6.prefix;
map->fec.prefix.prefixlen = fec->u.ipv6.prefixlen;
break;
case FEC_TYPE_PWID:
map->type = MAP_TYPE_PWID;
map->fec.pwid.type = fec->u.pwid.type;
map->fec.pwid.group_id = 0;
map->flags |= F_MAP_PW_ID;
map->fec.pwid.pwid = fec->u.pwid.pwid;
break;
}
}
void
lde_map2fec(struct map *map, struct in_addr lsr_id, struct fec *fec)
{
memset(fec, 0, sizeof(*fec));
switch (map->type) {
case MAP_TYPE_PREFIX:
switch (map->fec.prefix.af) {
case AF_INET:
fec->type = FEC_TYPE_IPV4;
fec->u.ipv4.prefix = map->fec.prefix.prefix.v4;
fec->u.ipv4.prefixlen = map->fec.prefix.prefixlen;
break;
case AF_INET6:
fec->type = FEC_TYPE_IPV6;
fec->u.ipv6.prefix = map->fec.prefix.prefix.v6;
fec->u.ipv6.prefixlen = map->fec.prefix.prefixlen;
break;
default:
fatalx("lde_map2fec: unknown af");
break;
}
break;
case MAP_TYPE_PWID:
fec->type = FEC_TYPE_PWID;
fec->u.pwid.type = map->fec.pwid.type;
fec->u.pwid.pwid = map->fec.pwid.pwid;
fec->u.pwid.lsr_id = lsr_id;
break;
}
}
void
lde_send_labelmapping(struct lde_nbr *ln, struct fec_node *fn, int single)
{
struct lde_wdraw *lw;
struct lde_map *me;
struct lde_req *lre;
struct map map;
struct l2vpn_pw *pw;
struct fec_nh *fnh;
bool allow = false;
/*
* Ordered Control: do not send a labelmap msg until
* a labelmap message is received from downstream router
* and don't send labelmap back to downstream router
*/
if (ldeconf->flags & F_LDPD_ORDERED_CONTROL) {
LIST_FOREACH(fnh, &fn->nexthops, entry) {
if (fnh->flags & F_FEC_NH_DEFER)
continue;
if (lde_address_find(ln, fnh->af, &fnh->nexthop))
return;
allow = true;
break;
}
if (!allow)
return;
}
/*
* We shouldn't send a new label mapping if we have a pending
* label release to receive. In this case, schedule to send a
* label mapping as soon as a label release is received.
*/
lw = (struct lde_wdraw *)fec_find(&ln->sent_wdraw, &fn->fec);
if (lw) {
if (!fec_find(&ln->sent_map_pending, &fn->fec)) {
debug_evt("%s: FEC %s: scheduling to send label mapping later (waiting for pending label release)",
__func__, log_fec(&fn->fec));
lde_map_pending_add(ln, fn);
}
return;
}
/*
* This function skips SL.1 - 3 and SL.9 - 14 because the label
* allocation is done way earlier (because of the merging nature of
* ldpd).
*/
lde_fec2map(&fn->fec, &map);
switch (fn->fec.type) {
case FEC_TYPE_IPV4:
if (!ln->v4_enabled)
return;
if (lde_acl_check(ldeconf->ipv4.acl_label_advertise_to,
AF_INET, (union ldpd_addr *)&ln->id, 32) != FILTER_PERMIT)
return;
if (lde_acl_check(ldeconf->ipv4.acl_label_advertise_for,
AF_INET, (union ldpd_addr *)&fn->fec.u.ipv4.prefix,
fn->fec.u.ipv4.prefixlen) != FILTER_PERMIT)
return;
break;
case FEC_TYPE_IPV6:
if (!ln->v6_enabled)