/* * EIGRP Interface Functions. * Copyright (C) 2013-2016 * Authors: * Donnie Savage * Jan Janovic * Matej Perina * Peter Orsag * Peter Paluch * Frantisek Gazo * Tomas Hvorkovy * Martin Kontsek * Lukas Koribsky * * 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 #include "thread.h" #include "linklist.h" #include "prefix.h" #include "if.h" #include "table.h" #include "memory.h" #include "command.h" #include "stream.h" #include "log.h" #include "keychain.h" #include "vrf.h" #include "eigrpd/eigrp_structs.h" #include "eigrpd/eigrpd.h" #include "eigrpd/eigrp_interface.h" #include "eigrpd/eigrp_neighbor.h" #include "eigrpd/eigrp_packet.h" #include "eigrpd/eigrp_zebra.h" #include "eigrpd/eigrp_vty.h" #include "eigrpd/eigrp_network.h" #include "eigrpd/eigrp_topology.h" #include "eigrpd/eigrp_fsm.h" #include "eigrpd/eigrp_dump.h" #include "eigrpd/eigrp_types.h" #include "eigrpd/eigrp_metric.h" DEFINE_MTYPE_STATIC(EIGRPD, EIGRP_IF, "EIGRP interface"); DEFINE_MTYPE_STATIC(EIGRPD, EIGRP_IF_INFO, "EIGRP Interface Information"); struct eigrp_interface *eigrp_if_new(struct eigrp *eigrp, struct interface *ifp, struct prefix *p) { struct eigrp_interface *ei = ifp->info; int i; if (ei) return ei; ei = XCALLOC(MTYPE_EIGRP_IF, sizeof(struct eigrp_interface)); /* Set zebra interface pointer. */ ei->ifp = ifp; prefix_copy(&ei->address, p); ifp->info = ei; listnode_add(eigrp->eiflist, ei); ei->type = EIGRP_IFTYPE_BROADCAST; /* Initialize neighbor list. */ ei->nbrs = list_new(); ei->crypt_seqnum = time(NULL); /* Initialize lists */ for (i = 0; i < EIGRP_FILTER_MAX; i++) { ei->list[i] = NULL; ei->prefix[i] = NULL; ei->routemap[i] = NULL; } ei->eigrp = eigrp; ei->params.v_hello = EIGRP_HELLO_INTERVAL_DEFAULT; ei->params.v_wait = EIGRP_HOLD_INTERVAL_DEFAULT; ei->params.bandwidth = EIGRP_BANDWIDTH_DEFAULT; ei->params.delay = EIGRP_DELAY_DEFAULT; ei->params.reliability = EIGRP_RELIABILITY_DEFAULT; ei->params.load = EIGRP_LOAD_DEFAULT; ei->params.auth_type = EIGRP_AUTH_TYPE_NONE; ei->params.auth_keychain = NULL; ei->curr_bandwidth = ifp->bandwidth; ei->curr_mtu = ifp->mtu; return ei; } int eigrp_if_delete_hook(struct interface *ifp) { struct eigrp_interface *ei = ifp->info; struct eigrp *eigrp; if (!ei) return 0; list_delete(&ei->nbrs); eigrp = ei->eigrp; listnode_delete(eigrp->eiflist, ei); eigrp_fifo_free(ei->obuf); XFREE(MTYPE_EIGRP_IF_INFO, ifp->info); return 0; } static int eigrp_ifp_create(struct interface *ifp) { struct eigrp_interface *ei = ifp->info; if (!ei) return 0; ei->params.type = eigrp_default_iftype(ifp); eigrp_if_update(ifp); return 0; } static int eigrp_ifp_up(struct interface *ifp) { struct eigrp_interface *ei = ifp->info; if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) zlog_debug("Zebra: Interface[%s] state change to up.", ifp->name); if (!ei) return 0; if (ei->curr_bandwidth != ifp->bandwidth) { if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) zlog_debug( "Zebra: Interface[%s] bandwidth change %d -> %d.", ifp->name, ei->curr_bandwidth, ifp->bandwidth); ei->curr_bandwidth = ifp->bandwidth; // eigrp_if_recalculate_output_cost (ifp); } if (ei->curr_mtu != ifp->mtu) { if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) zlog_debug( "Zebra: Interface[%s] MTU change %u -> %u.", ifp->name, ei->curr_mtu, ifp->mtu); ei->curr_mtu = ifp->mtu; /* Must reset the interface (simulate down/up) when MTU * changes. */ eigrp_if_reset(ifp); return 0; } eigrp_if_up(ifp->info); return 0; } static int eigrp_ifp_down(struct interface *ifp) { if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) zlog_debug("Zebra: Interface[%s] state change to down.", ifp->name); if (ifp->info) eigrp_if_down(ifp->info); return 0; } static int eigrp_ifp_destroy(struct interface *ifp) { if (if_is_up(ifp)) zlog_warn("Zebra: got delete of %s, but interface is still up", ifp->name); if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE)) zlog_debug( "Zebra: interface delete %s index %d flags %llx metric %d mtu %d", ifp->name, ifp->ifindex, (unsigned long long)ifp->flags, ifp->metric, ifp->mtu); if (ifp->info) eigrp_if_free(ifp->info, INTERFACE_DOWN_BY_ZEBRA); return 0; } struct list *eigrp_iflist; void eigrp_if_init(void) { if_zapi_callbacks(eigrp_ifp_create, eigrp_ifp_up, eigrp_ifp_down, eigrp_ifp_destroy); /* Initialize Zebra interface data structure. */ // hook_register_prio(if_add, 0, eigrp_if_new); hook_register_prio(if_del, 0, eigrp_if_delete_hook); } void eigrp_del_if_params(struct eigrp_if_params *eip) { if (eip->auth_keychain) free(eip->auth_keychain); } /* * Set the network byte order of the 3 bytes we send * of the mtu of the link. */ static void eigrp_mtu_convert(struct eigrp_metrics *metric, uint32_t host_mtu) { uint32_t network_mtu = htonl(host_mtu); uint8_t *nm = (uint8_t *)&network_mtu; metric->mtu[0] = nm[1]; metric->mtu[1] = nm[2]; metric->mtu[2] = nm[3]; } int eigrp_if_up(struct eigrp_interface *ei) { struct eigrp_prefix_descriptor *pe; struct eigrp_route_descriptor *ne; struct eigrp_metrics metric; struct eigrp_interface *ei2; struct listnode *node, *nnode; struct eigrp *eigrp; if (ei == NULL) return 0; eigrp = ei->eigrp; eigrp_adjust_sndbuflen(eigrp, ei->ifp->mtu); eigrp_if_stream_set(ei); /* Set multicast memberships appropriately for new state. */ eigrp_if_set_multicast(ei); thread_add_event(master, eigrp_hello_timer, ei, (1), NULL); /*Prepare metrics*/ metric.bandwidth = eigrp_bandwidth_to_scaled(ei->params.bandwidth); metric.delay = eigrp_delay_to_scaled(ei->params.delay); metric.load = ei->params.load; metric.reliability = ei->params.reliability; eigrp_mtu_convert(&metric, ei->ifp->mtu); metric.hop_count = 0; metric.flags = 0; metric.tag = 0; /*Add connected entry to topology table*/ ne = eigrp_route_descriptor_new(); ne->ei = ei; ne->reported_metric = metric; ne->total_metric = metric; ne->distance = eigrp_calculate_metrics(eigrp, metric); ne->reported_distance = 0; ne->adv_router = eigrp->neighbor_self; ne->flags = EIGRP_ROUTE_DESCRIPTOR_SUCCESSOR_FLAG; struct prefix dest_addr; dest_addr = ei->address; apply_mask(&dest_addr); pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table, &dest_addr); if (pe == NULL) { pe = eigrp_prefix_descriptor_new(); pe->serno = eigrp->serno; pe->destination = (struct prefix *)prefix_ipv4_new(); prefix_copy(pe->destination, &dest_addr); pe->af = AF_INET; pe->nt = EIGRP_TOPOLOGY_TYPE_CONNECTED; ne->prefix = pe; pe->reported_metric = metric; pe->state = EIGRP_FSM_STATE_PASSIVE; pe->fdistance = eigrp_calculate_metrics(eigrp, metric); pe->req_action |= EIGRP_FSM_NEED_UPDATE; eigrp_prefix_descriptor_add(eigrp->topology_table, pe); listnode_add(eigrp->topology_changes_internalIPV4, pe); eigrp_route_descriptor_add(eigrp, pe, ne); for (ALL_LIST_ELEMENTS(eigrp->eiflist, node, nnode, ei2)) { eigrp_update_send(ei2); } pe->req_action &= ~EIGRP_FSM_NEED_UPDATE; listnode_delete(eigrp->topology_changes_internalIPV4, pe); } else { struct eigrp_fsm_action_message msg; ne->prefix = pe; eigrp_route_descriptor_add(eigrp, pe, ne); msg.packet_type = EIGRP_OPC_UPDATE; msg.eigrp = eigrp; msg.data_type = EIGRP_CONNECTED; msg.adv_router = NULL; msg.entry = ne; msg.prefix = pe; eigrp_fsm_event(&msg); } return 1; } int eigrp_if_down(struct eigrp_interface *ei) { struct listnode *node, *nnode; struct eigrp_neighbor *nbr; if (ei == NULL) return 0; /* Shutdown packet reception and sending */ THREAD_OFF(ei->t_hello); eigrp_if_stream_unset(ei); /*Set infinite metrics to routes learned by this interface and start * query process*/ for (ALL_LIST_ELEMENTS(ei->nbrs, node, nnode, nbr)) { eigrp_nbr_delete(nbr); } return 1; } void eigrp_if_stream_set(struct eigrp_interface *ei) { /* set output fifo queue. */ if (ei->obuf == NULL) ei->obuf = eigrp_fifo_new(); } void eigrp_if_stream_unset(struct eigrp_interface *ei) { struct eigrp *eigrp = ei->eigrp; if (ei->on_write_q) { listnode_delete(eigrp->oi_write_q, ei); if (list_isempty(eigrp->oi_write_q)) thread_cancel(&(eigrp->t_write)); ei->on_write_q = 0; } } bool eigrp_if_is_passive(struct eigrp_interface *ei) { if (ei->params.passive_interface == EIGRP_IF_ACTIVE) return false; if (ei->eigrp->passive_interface_default == EIGRP_IF_ACTIVE) return false; return true; } void eigrp_if_set_multicast(struct eigrp_interface *ei) { if (!eigrp_if_is_passive(ei)) { /* The interface should belong to the EIGRP-all-routers group. */ if (!ei->member_allrouters && (eigrp_if_add_allspfrouters(ei->eigrp, &ei->address, ei->ifp->ifindex) >= 0)) /* Set the flag only if the system call to join * succeeded. */ ei->member_allrouters = true; } else { /* The interface should NOT belong to the EIGRP-all-routers * group. */ if (ei->member_allrouters) { /* Only actually drop if this is the last reference */ eigrp_if_drop_allspfrouters(ei->eigrp, &ei->address, ei->ifp->ifindex); /* Unset the flag regardless of whether the system call to leave the group succeeded, since it's much safer to assume that we are not a member. */ ei->member_allrouters = false; } } } uint8_t eigrp_default_iftype(struct interface *ifp) { if (if_is_pointopoint(ifp)) return EIGRP_IFTYPE_POINTOPOINT; else if (if_is_loopback(ifp)) return EIGRP_IFTYPE_LOOPBACK; else return EIGRP_IFTYPE_BROADCAST; } void eigrp_if_free(struct eigrp_interface *ei, int source) { struct prefix dest_addr; struct eigrp_prefix_descriptor *pe; struct eigrp *eigrp = ei->eigrp; if (source == INTERFACE_DOWN_BY_VTY) { thread_cancel(&ei->t_hello); eigrp_hello_send(ei, EIGRP_HELLO_GRACEFUL_SHUTDOWN, NULL); } dest_addr = ei->address; apply_mask(&dest_addr); pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table, &dest_addr); if (pe) eigrp_prefix_descriptor_delete(eigrp, eigrp->topology_table, pe); eigrp_if_down(ei); listnode_delete(ei->eigrp->eiflist, ei); } /* Simulate down/up on the interface. This is needed, for example, when the MTU changes. */ void eigrp_if_reset(struct interface *ifp) { struct eigrp_interface *ei = ifp->info; if (!ei) return; eigrp_if_down(ei); eigrp_if_up(ei); } struct eigrp_interface *eigrp_if_lookup_by_local_addr(struct eigrp *eigrp, struct interface *ifp, struct in_addr address) { struct listnode *node; struct eigrp_interface *ei; for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) { if (ifp && ei->ifp != ifp) continue; if (IPV4_ADDR_SAME(&address, &ei->address.u.prefix4)) return ei; } return NULL; } /** * @fn eigrp_if_lookup_by_name * * @param[in] eigrp EIGRP process * @param[in] if_name Name of the interface * * @return struct eigrp_interface * * * @par * Function is used for lookup interface by name. */ struct eigrp_interface *eigrp_if_lookup_by_name(struct eigrp *eigrp, const char *if_name) { struct eigrp_interface *ei; struct listnode *node; /* iterate over all eigrp interfaces */ for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) { /* compare int name with eigrp interface's name */ if (strcmp(ei->ifp->name, if_name) == 0) { return ei; } } return NULL; }