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Diffstat (limited to '')
-rw-r--r-- | eigrpd/eigrp_interface.c | 513 |
1 files changed, 513 insertions, 0 deletions
diff --git a/eigrpd/eigrp_interface.c b/eigrpd/eigrp_interface.c new file mode 100644 index 0000000..28987b4 --- /dev/null +++ b/eigrpd/eigrp_interface.c @@ -0,0 +1,513 @@ +/* + * 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 <zebra.h> + +#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), &ei->t_hello); + + /*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; +} |