diff options
Diffstat (limited to 'ldpd/ldp_zebra.c')
-rw-r--r-- | ldpd/ldp_zebra.c | 713 |
1 files changed, 713 insertions, 0 deletions
diff --git a/ldpd/ldp_zebra.c b/ldpd/ldp_zebra.c new file mode 100644 index 0000000..0fd5d46 --- /dev/null +++ b/ldpd/ldp_zebra.c @@ -0,0 +1,713 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2016 by Open Source Routing. + */ + +#include <zebra.h> + +#include "prefix.h" +#include "stream.h" +#include "memory.h" +#include "zclient.h" +#include "command.h" +#include "network.h" +#include "linklist.h" +#include "mpls.h" + +#include "ldpd.h" +#include "ldpe.h" +#include "lde.h" +#include "ldp_sync.h" +#include "log.h" +#include "ldp_debug.h" + +static void ifp2kif(struct interface *, struct kif *); +static void ifc2kaddr(struct interface *, struct connected *, struct kaddr *); +static int ldp_zebra_send_mpls_labels(int, struct kroute *); +static int ldp_router_id_update(ZAPI_CALLBACK_ARGS); +static int ldp_interface_address_add(ZAPI_CALLBACK_ARGS); +static int ldp_interface_address_delete(ZAPI_CALLBACK_ARGS); +static int ldp_zebra_read_route(ZAPI_CALLBACK_ARGS); +static int ldp_zebra_read_pw_status_update(ZAPI_CALLBACK_ARGS); +static void ldp_zebra_connected(struct zclient *); +static void ldp_zebra_filter_update(struct access_list *access); + +static void ldp_zebra_opaque_register(void); +static void ldp_zebra_opaque_unregister(void); +static int ldp_sync_zebra_send_announce(void); +static int ldp_zebra_opaque_msg_handler(ZAPI_CALLBACK_ARGS); +static void ldp_sync_zebra_init(void); + +static struct zclient *zclient; +extern struct zclient *zclient_sync; +static bool zebra_registered = false; + +static void +ifp2kif(struct interface *ifp, struct kif *kif) +{ + memset(kif, 0, sizeof(*kif)); + strlcpy(kif->ifname, ifp->name, sizeof(kif->ifname)); + kif->ifindex = ifp->ifindex; + kif->operative = if_is_operative(ifp); + if (ifp->ll_type == ZEBRA_LLT_ETHER) + memcpy(kif->mac, ifp->hw_addr, ETH_ALEN); +} + +static void +ifc2kaddr(struct interface *ifp, struct connected *ifc, struct kaddr *ka) +{ + memset(ka, 0, sizeof(*ka)); + strlcpy(ka->ifname, ifp->name, sizeof(ka->ifname)); + ka->ifindex = ifp->ifindex; + ka->af = ifc->address->family; + ka->prefixlen = ifc->address->prefixlen; + + switch (ka->af) { + case AF_INET: + ka->addr.v4 = ifc->address->u.prefix4; + if (ifc->destination) + ka->dstbrd.v4 = ifc->destination->u.prefix4; + break; + case AF_INET6: + ka->addr.v6 = ifc->address->u.prefix6; + if (ifc->destination) + ka->dstbrd.v6 = ifc->destination->u.prefix6; + break; + default: + break; + } +} + +void +pw2zpw(struct l2vpn_pw *pw, struct zapi_pw *zpw) +{ + memset(zpw, 0, sizeof(*zpw)); + strlcpy(zpw->ifname, pw->ifname, sizeof(zpw->ifname)); + zpw->ifindex = pw->ifindex; + zpw->type = pw->l2vpn->pw_type; + zpw->af = pw->af; + zpw->nexthop.ipv6 = pw->addr.v6; + zpw->local_label = NO_LABEL; + zpw->remote_label = NO_LABEL; + if (CHECK_FLAG(pw->flags, F_PW_CWORD)) + zpw->flags = F_PSEUDOWIRE_CWORD; + zpw->data.ldp.lsr_id = pw->lsr_id; + zpw->data.ldp.pwid = pw->pwid; + strlcpy(zpw->data.ldp.vpn_name, pw->l2vpn->name, + sizeof(zpw->data.ldp.vpn_name)); +} + +static void +ldp_zebra_opaque_register(void) +{ + zclient_register_opaque(zclient, LDP_IGP_SYNC_IF_STATE_REQUEST); + zclient_register_opaque(zclient, LDP_RLFA_REGISTER); + zclient_register_opaque(zclient, LDP_RLFA_UNREGISTER_ALL); +} + +static void +ldp_zebra_opaque_unregister(void) +{ + zclient_unregister_opaque(zclient, LDP_IGP_SYNC_IF_STATE_REQUEST); + zclient_unregister_opaque(zclient, LDP_RLFA_REGISTER); + zclient_unregister_opaque(zclient, LDP_RLFA_UNREGISTER_ALL); +} + +int +ldp_sync_zebra_send_state_update(struct ldp_igp_sync_if_state *state) +{ + if (zclient_send_opaque(zclient, LDP_IGP_SYNC_IF_STATE_UPDATE, + (const uint8_t *)state, sizeof(*state)) + == ZCLIENT_SEND_FAILURE) + return -1; + else + return 0; +} + +static int +ldp_sync_zebra_send_announce(void) +{ + struct ldp_igp_sync_announce announce; + announce.proto = ZEBRA_ROUTE_LDP; + + if (zclient_send_opaque(zclient, LDP_IGP_SYNC_ANNOUNCE_UPDATE, + (const uint8_t *)&announce, sizeof(announce)) + == ZCLIENT_SEND_FAILURE) + return -1; + else + return 0; +} + +int ldp_zebra_send_rlfa_labels(struct zapi_rlfa_response *rlfa_labels) +{ + int ret; + + ret = zclient_send_opaque(zclient, LDP_RLFA_LABELS, + (const uint8_t *)rlfa_labels, + sizeof(*rlfa_labels)); + if (ret == ZCLIENT_SEND_FAILURE) { + log_warn("failed to send RLFA labels to IGP"); + return -1; + } + + return 0; +} + +static int +ldp_zebra_opaque_msg_handler(ZAPI_CALLBACK_ARGS) +{ + struct stream *s; + struct zapi_opaque_msg info; + struct ldp_igp_sync_if_state_req state_req; + struct zapi_rlfa_igp igp; + struct zapi_rlfa_request rlfa; + + s = zclient->ibuf; + + if(zclient_opaque_decode(s, &info) != 0) + return -1; + + switch (info.type) { + case LDP_IGP_SYNC_IF_STATE_REQUEST: + STREAM_GET(&state_req, s, sizeof(state_req)); + main_imsg_compose_ldpe(IMSG_LDP_SYNC_IF_STATE_REQUEST, 0, &state_req, + sizeof(state_req)); + break; + case LDP_RLFA_REGISTER: + STREAM_GET(&rlfa, s, sizeof(rlfa)); + main_imsg_compose_both(IMSG_RLFA_REG, &rlfa, sizeof(rlfa)); + break; + case LDP_RLFA_UNREGISTER_ALL: + STREAM_GET(&igp, s, sizeof(igp)); + main_imsg_compose_both(IMSG_RLFA_UNREG_ALL, &igp, sizeof(igp)); + break; + default: + break; + } + +stream_failure: + return 0; +} + +static void +ldp_sync_zebra_init(void) +{ + ldp_sync_zebra_send_announce(); +} + +static int +ldp_zebra_send_mpls_labels(int cmd, struct kroute *kr) +{ + struct zapi_labels zl = {}; + struct zapi_nexthop *znh; + + if (kr->local_label < MPLS_LABEL_RESERVED_MAX) + return (0); + + debug_zebra_out("prefix %s/%u nexthop %s ifindex %u labels %s/%s (%s)", + log_addr(kr->af, &kr->prefix), kr->prefixlen, + log_addr(kr->af, &kr->nexthop), kr->ifindex, + log_label(kr->local_label), log_label(kr->remote_label), + (cmd == ZEBRA_MPLS_LABELS_ADD) ? "add" : "delete"); + + zl.type = ZEBRA_LSP_LDP; + zl.local_label = kr->local_label; + + /* Set prefix. */ + if (kr->remote_label != NO_LABEL) { + SET_FLAG(zl.message, ZAPI_LABELS_FTN); + zl.route.prefix.family = kr->af; + switch (kr->af) { + case AF_INET: + zl.route.prefix.u.prefix4 = kr->prefix.v4; + break; + case AF_INET6: + zl.route.prefix.u.prefix6 = kr->prefix.v6; + break; + default: + fatalx("ldp_zebra_send_mpls_labels: unknown af"); + } + zl.route.prefix.prefixlen = kr->prefixlen; + zl.route.type = kr->route_type; + zl.route.instance = kr->route_instance; + } + + /* If allow-broken-lsps is enabled then if an lsp is received with + * no remote label, instruct the forwarding plane to pop the top-level + * label and forward packets normally. This is a best-effort attempt + * to deliver labeled IP packets to their final destination (instead of + * dropping them). + */ + if (kr->remote_label == NO_LABEL + && !CHECK_FLAG(ldpd_conf->flags, F_LDPD_ALLOW_BROKEN_LSP) + && cmd == ZEBRA_MPLS_LABELS_ADD) + return 0; + + if (kr->remote_label == NO_LABEL) + kr->remote_label = MPLS_LABEL_IMPLICIT_NULL; + + /* Set nexthop. */ + zl.nexthop_num = 1; + znh = &zl.nexthops[0]; + switch (kr->af) { + case AF_INET: + znh->gate.ipv4 = kr->nexthop.v4; + if (kr->ifindex) + znh->type = NEXTHOP_TYPE_IPV4_IFINDEX; + else + znh->type = NEXTHOP_TYPE_IPV4; + break; + case AF_INET6: + znh->gate.ipv6 = kr->nexthop.v6; + if (kr->ifindex) + znh->type = NEXTHOP_TYPE_IPV6_IFINDEX; + else + znh->type = NEXTHOP_TYPE_IPV6; + break; + default: + break; + } + znh->ifindex = kr->ifindex; + znh->label_num = 1; + znh->labels[0] = kr->remote_label; + + if (zebra_send_mpls_labels(zclient, cmd, &zl) == ZCLIENT_SEND_FAILURE) + return -1; + + return 0; +} + +int +kr_change(struct kroute *kr) +{ + return (ldp_zebra_send_mpls_labels(ZEBRA_MPLS_LABELS_ADD, kr)); +} + +int +kr_delete(struct kroute *kr) +{ + return (ldp_zebra_send_mpls_labels(ZEBRA_MPLS_LABELS_DELETE, kr)); +} + +int +kmpw_add(struct zapi_pw *zpw) +{ + debug_zebra_out("pseudowire %s nexthop %s (add)", + zpw->ifname, log_addr(zpw->af, (union ldpd_addr *)&zpw->nexthop)); + + return zebra_send_pw(zclient, ZEBRA_PW_ADD, zpw) == ZCLIENT_SEND_FAILURE; +} + +int +kmpw_del(struct zapi_pw *zpw) +{ + debug_zebra_out("pseudowire %s nexthop %s (del)", + zpw->ifname, log_addr(zpw->af, (union ldpd_addr *)&zpw->nexthop)); + + return zebra_send_pw(zclient, ZEBRA_PW_DELETE, zpw) == ZCLIENT_SEND_FAILURE; +} + +int +kmpw_set(struct zapi_pw *zpw) +{ + debug_zebra_out("pseudowire %s nexthop %s labels %u/%u (set)", + zpw->ifname, log_addr(zpw->af, (union ldpd_addr *)&zpw->nexthop), + zpw->local_label, zpw->remote_label); + + return zebra_send_pw(zclient, ZEBRA_PW_SET, zpw) == ZCLIENT_SEND_FAILURE; +} + +int +kmpw_unset(struct zapi_pw *zpw) +{ + debug_zebra_out("pseudowire %s nexthop %s (unset)", + zpw->ifname, log_addr(zpw->af, (union ldpd_addr *)&zpw->nexthop)); + + return zebra_send_pw(zclient, ZEBRA_PW_UNSET, zpw) == ZCLIENT_SEND_FAILURE; +} + +void +kif_redistribute(const char *ifname) +{ + struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT); + struct listnode *cnode; + struct interface *ifp; + struct connected *ifc; + struct kif kif; + struct kaddr ka; + + FOR_ALL_INTERFACES (vrf, ifp) { + if (ifname && strcmp(ifname, ifp->name) != 0) + continue; + + ifp2kif(ifp, &kif); + main_imsg_compose_both(IMSG_IFSTATUS, &kif, sizeof(kif)); + + for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, ifc)) { + ifc2kaddr(ifp, ifc, &ka); + main_imsg_compose_ldpe(IMSG_NEWADDR, 0, &ka, sizeof(ka)); + } + } +} + +static int +ldp_router_id_update(ZAPI_CALLBACK_ARGS) +{ + struct prefix router_id; + + zebra_router_id_update_read(zclient->ibuf, &router_id); + + if (bad_addr_v4(router_id.u.prefix4)) + return (0); + + debug_zebra_in("router-id update %pI4", &router_id.u.prefix4); + + global.rtr_id.s_addr = router_id.u.prefix4.s_addr; + main_imsg_compose_ldpe(IMSG_RTRID_UPDATE, 0, &global.rtr_id, + sizeof(global.rtr_id)); + + return (0); +} + +static int +ldp_ifp_create(struct interface *ifp) +{ + struct kif kif; + + debug_zebra_in("interface add %s index %d mtu %d", ifp->name, + ifp->ifindex, ifp->mtu); + + ifp2kif(ifp, &kif); + main_imsg_compose_both(IMSG_IFSTATUS, &kif, sizeof(kif)); + + return 0; +} + +static int +ldp_ifp_destroy(struct interface *ifp) +{ + struct kif kif; + + debug_zebra_in("interface delete %s index %d mtu %d", ifp->name, + ifp->ifindex, ifp->mtu); + + ifp2kif(ifp, &kif); + main_imsg_compose_both(IMSG_IFSTATUS, &kif, sizeof(kif)); + + return (0); +} + +static int +ldp_interface_status_change(struct interface *ifp) +{ + struct listnode *node; + struct connected *ifc; + struct kif kif; + struct kaddr ka; + + debug_zebra_in("interface %s state update", ifp->name); + + ifp2kif(ifp, &kif); + main_imsg_compose_both(IMSG_IFSTATUS, &kif, sizeof(kif)); + + if (if_is_operative(ifp)) { + for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) { + ifc2kaddr(ifp, ifc, &ka); + main_imsg_compose_ldpe(IMSG_NEWADDR, 0, &ka, sizeof(ka)); + } + } else { + for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) { + ifc2kaddr(ifp, ifc, &ka); + main_imsg_compose_ldpe(IMSG_DELADDR, 0, &ka, sizeof(ka)); + } + } + + return (0); +} + +static int ldp_ifp_up(struct interface *ifp) +{ + return ldp_interface_status_change(ifp); +} + +static int ldp_ifp_down(struct interface *ifp) +{ + return ldp_interface_status_change(ifp); +} + +static int +ldp_interface_address_add(ZAPI_CALLBACK_ARGS) +{ + struct connected *ifc; + struct interface *ifp; + struct kaddr ka; + + ifc = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id); + if (ifc == NULL) + return (0); + + ifp = ifc->ifp; + ifc2kaddr(ifp, ifc, &ka); + + /* Filter invalid addresses. */ + if (bad_addr(ka.af, &ka.addr)) + return (0); + + debug_zebra_in("address add %s/%u interface %s", + log_addr(ka.af, &ka.addr), ka.prefixlen, ifp->name); + + /* notify ldpe about new address */ + main_imsg_compose_ldpe(IMSG_NEWADDR, 0, &ka, sizeof(ka)); + + return (0); +} + +static int +ldp_interface_address_delete(ZAPI_CALLBACK_ARGS) +{ + struct connected *ifc; + struct interface *ifp; + struct kaddr ka; + + ifc = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id); + if (ifc == NULL) + return (0); + + ifp = ifc->ifp; + ifc2kaddr(ifp, ifc, &ka); + connected_free(&ifc); + + /* Filter invalid addresses. */ + if (bad_addr(ka.af, &ka.addr)) + return (0); + + debug_zebra_in("address delete %s/%u interface %s", + log_addr(ka.af, &ka.addr), ka.prefixlen, ifp->name); + + /* notify ldpe about removed address */ + main_imsg_compose_ldpe(IMSG_DELADDR, 0, &ka, sizeof(ka)); + + return (0); +} + +static int +ldp_zebra_read_route(ZAPI_CALLBACK_ARGS) +{ + struct zapi_route api; + struct zapi_nexthop *api_nh; + struct kroute kr; + int i, add = 0; + + if (zapi_route_decode(zclient->ibuf, &api) < 0) + return -1; + + /* we completely ignore srcdest routes for now. */ + if (CHECK_FLAG(api.message, ZAPI_MESSAGE_SRCPFX)) + return (0); + + memset(&kr, 0, sizeof(kr)); + kr.af = api.prefix.family; + switch (kr.af) { + case AF_INET: + kr.prefix.v4 = api.prefix.u.prefix4; + break; + case AF_INET6: + kr.prefix.v6 = api.prefix.u.prefix6; + break; + default: + break; + } + kr.prefixlen = api.prefix.prefixlen; + kr.route_type = api.type; + kr.route_instance = api.instance; + + switch (api.type) { + case ZEBRA_ROUTE_CONNECT: + SET_FLAG(kr.flags, F_CONNECTED); + break; + case ZEBRA_ROUTE_BGP: + /* LDP should follow the IGP and ignore BGP routes */ + return (0); + default: + break; + } + + if (bad_addr(kr.af, &kr.prefix) || + (kr.af == AF_INET6 && IN6_IS_SCOPE_EMBED(&kr.prefix.v6))) + return (0); + + if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD) + add = 1; + + if (api.nexthop_num == 0) + debug_zebra_in("route %s %s/%d (%s)", (add) ? "add" : "delete", + log_addr(kr.af, &kr.prefix), kr.prefixlen, + zebra_route_string(api.type)); + + /* loop through all the nexthops */ + for (i = 0; i < api.nexthop_num; i++) { + api_nh = &api.nexthops[i]; + switch (api_nh->type) { + case NEXTHOP_TYPE_IPV4: + if (kr.af != AF_INET) + continue; + kr.nexthop.v4 = api_nh->gate.ipv4; + kr.ifindex = 0; + break; + case NEXTHOP_TYPE_IPV4_IFINDEX: + if (kr.af != AF_INET) + continue; + kr.nexthop.v4 = api_nh->gate.ipv4; + kr.ifindex = api_nh->ifindex; + break; + case NEXTHOP_TYPE_IPV6: + if (kr.af != AF_INET6) + continue; + kr.nexthop.v6 = api_nh->gate.ipv6; + kr.ifindex = 0; + break; + case NEXTHOP_TYPE_IPV6_IFINDEX: + if (kr.af != AF_INET6) + continue; + kr.nexthop.v6 = api_nh->gate.ipv6; + kr.ifindex = api_nh->ifindex; + break; + case NEXTHOP_TYPE_IFINDEX: + if (!CHECK_FLAG(kr.flags, F_CONNECTED)) + continue; + break; + case NEXTHOP_TYPE_BLACKHOLE: + continue; + } + + debug_zebra_in("route %s %s/%d nexthop %s ifindex %u (%s)", + (add) ? "add" : "delete", log_addr(kr.af, &kr.prefix), + kr.prefixlen, log_addr(kr.af, &kr.nexthop), kr.ifindex, + zebra_route_string(api.type)); + + if (add) + main_imsg_compose_lde(IMSG_NETWORK_ADD, 0, &kr, sizeof(kr)); + } + + main_imsg_compose_lde(IMSG_NETWORK_UPDATE, 0, &kr, sizeof(kr)); + + return (0); +} + +/* + * Receive PW status update from Zebra and send it to LDE process. + */ +static int +ldp_zebra_read_pw_status_update(ZAPI_CALLBACK_ARGS) +{ + struct zapi_pw_status zpw; + + zebra_read_pw_status_update(cmd, zclient, length, vrf_id, &zpw); + + debug_zebra_in("pseudowire %s status %s 0x%x", zpw.ifname, + (zpw.status == PW_FORWARDING) ? "up" : "down", + zpw.status); + + main_imsg_compose_lde(IMSG_PW_UPDATE, 0, &zpw, sizeof(zpw)); + + return (0); +} + +void ldp_zebra_regdereg_zebra_info(bool want_register) +{ + if (zebra_registered == want_register) + return; + + log_debug("%s to receive default VRF information", + want_register ? "Register" : "De-register"); + + if (want_register) { + zclient_send_reg_requests(zclient, VRF_DEFAULT); + zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP, + ZEBRA_ROUTE_ALL, 0, VRF_DEFAULT); + zebra_redistribute_send(ZEBRA_REDISTRIBUTE_ADD, zclient, + AFI_IP6, ZEBRA_ROUTE_ALL, 0, + VRF_DEFAULT); + } else { + zclient_send_dereg_requests(zclient, VRF_DEFAULT); + zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient, + AFI_IP, ZEBRA_ROUTE_ALL, 0, + VRF_DEFAULT); + zebra_redistribute_send(ZEBRA_REDISTRIBUTE_DELETE, zclient, + AFI_IP6, ZEBRA_ROUTE_ALL, 0, + VRF_DEFAULT); + } + zebra_registered = want_register; +} + +static void +ldp_zebra_connected(struct zclient *zclient) +{ + zebra_registered = false; + + /* if MPLS was already enabled and we are re-connecting, register again + */ + if (CHECK_FLAG(vty_conf->flags, F_LDPD_ENABLED)) + ldp_zebra_regdereg_zebra_info(true); + + ldp_zebra_opaque_register(); + + ldp_sync_zebra_init(); +} + +static void +ldp_zebra_filter_update(struct access_list *access) +{ + struct ldp_access laccess; + + if (access && access->name[0] != '\0') { + strlcpy(laccess.name, access->name, sizeof(laccess.name)); + debug_evt("%s ACL update filter name %s", __func__, access->name); + + main_imsg_compose_both(IMSG_FILTER_UPDATE, &laccess, sizeof(laccess)); + } +} + +extern struct zebra_privs_t ldpd_privs; + +static zclient_handler *const ldp_handlers[] = { + [ZEBRA_ROUTER_ID_UPDATE] = ldp_router_id_update, + [ZEBRA_INTERFACE_ADDRESS_ADD] = ldp_interface_address_add, + [ZEBRA_INTERFACE_ADDRESS_DELETE] = ldp_interface_address_delete, + [ZEBRA_REDISTRIBUTE_ROUTE_ADD] = ldp_zebra_read_route, + [ZEBRA_REDISTRIBUTE_ROUTE_DEL] = ldp_zebra_read_route, + [ZEBRA_PW_STATUS_UPDATE] = ldp_zebra_read_pw_status_update, + [ZEBRA_OPAQUE_MESSAGE] = ldp_zebra_opaque_msg_handler, +}; + +void ldp_zebra_init(struct event_loop *master) +{ + if_zapi_callbacks(ldp_ifp_create, ldp_ifp_up, ldp_ifp_down, ldp_ifp_destroy); + + /* Set default values. */ + zclient = zclient_new(master, &zclient_options_default, ldp_handlers, + array_size(ldp_handlers)); + zclient_init(zclient, ZEBRA_ROUTE_LDP, 0, &ldpd_privs); + + /* set callbacks */ + zclient->zebra_connected = ldp_zebra_connected; + + /* Access list initialize. */ + access_list_add_hook(ldp_zebra_filter_update); + access_list_delete_hook(ldp_zebra_filter_update); +} + +void +ldp_zebra_destroy(void) +{ + ldp_zebra_opaque_unregister(); + zclient_stop(zclient); + zclient_free(zclient); + zclient = NULL; + + if (zclient_sync == NULL) + return; + zclient_stop(zclient_sync); + zclient_free(zclient_sync); + zclient_sync = NULL; +} |