diff options
Diffstat (limited to 'eigrpd/eigrp_update.c')
| -rw-r--r-- | eigrpd/eigrp_update.c | 1159 |
1 files changed, 1159 insertions, 0 deletions
diff --git a/eigrpd/eigrp_update.c b/eigrpd/eigrp_update.c new file mode 100644 index 000000000..358d77c84 --- /dev/null +++ b/eigrpd/eigrp_update.c @@ -0,0 +1,1159 @@ +/* + * EIGRP Sending and Receiving EIGRP Update Packets. + * 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 GNU Zebra; see the file COPYING. If not, write to the Free + * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + * 02111-1307, USA. + */ + +#include <zebra.h> + +#include "thread.h" +#include "memory.h" +#include "linklist.h" +#include "prefix.h" +#include "if.h" +#include "table.h" +#include "sockunion.h" +#include "stream.h" +#include "log.h" +#include "sockopt.h" +#include "checksum.h" +#include "md5.h" +#include "vty.h" +#include "plist.h" +#include "plist_int.h" +#include "routemap.h" +#include "vty.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_dump.h" +#include "eigrpd/eigrp_macros.h" +#include "eigrpd/eigrp_topology.h" +#include "eigrpd/eigrp_fsm.h" +#include "eigrpd/eigrp_network.h" +#include "eigrpd/eigrp_memory.h" + +/** + * @fn remove_received_prefix_gr + * + * @param[in] nbr_prefixes List of neighbor prefixes + * @param[in] recv_prefix Prefix which needs to be removed from list + * + * @return void + * + * @par + * Function is used for removing received prefix + * from list of neighbor prefixes + */ +static void +remove_received_prefix_gr (struct list *nbr_prefixes, struct eigrp_prefix_entry *recv_prefix) +{ + struct listnode *node1, *node11; + struct eigrp_prefix_entry *prefix; + + /* iterate over all prefixes in list */ + for (ALL_LIST_ELEMENTS(nbr_prefixes, node1, node11, prefix)) + { + /* remove prefix from list if found */ + if (prefix == recv_prefix) + { + listnode_delete(nbr_prefixes, prefix); + } + } +} + +/** + * @fn eigrp_update_receive_GR_ask + * + * @param[in] eigrp EIGRP process + * @param[in] nbr Neighbor update of who we received + * @param[in] nbr_prefixes Prefixes which weren't advertised + * + * @return void + * + * @par + * Function is used for notifying FSM about prefixes which + * weren't advertised by neighbor: + * We will send message to FSM with prefix delay set to infinity. + */ +static void +eigrp_update_receive_GR_ask (struct eigrp *eigrp, struct eigrp_neighbor *nbr, struct list *nbr_prefixes) +{ + struct listnode *node1; + struct eigrp_prefix_entry *prefix; + struct TLV_IPv4_Internal_type *tlv_max; + + /* iterate over all prefixes which weren't advertised by neighbor */ + for (ALL_LIST_ELEMENTS_RO(nbr_prefixes, node1, prefix)) + { + zlog_debug("GR receive: Neighbor not advertised %s/%d", + inet_ntoa(prefix->destination_ipv4->prefix), + prefix->destination_ipv4->prefixlen); + + /* create internal IPv4 TLV with infinite delay */ + tlv_max = eigrp_IPv4_InternalTLV_new(); + tlv_max->type = EIGRP_TLV_IPv4_INT; + tlv_max->length = 28U; + tlv_max->metric = prefix->reported_metric; + /* set delay to MAX */ + tlv_max->metric.delay = EIGRP_MAX_METRIC; + tlv_max->destination = prefix->destination_ipv4->prefix; + tlv_max->prefix_length = prefix->destination_ipv4->prefixlen; + + + /* prepare message for FSM */ + struct eigrp_fsm_action_message *fsm_msg; + fsm_msg = XCALLOC(MTYPE_EIGRP_FSM_MSG, + sizeof(struct eigrp_fsm_action_message)); + + struct eigrp_neighbor_entry *entry = + eigrp_prefix_entry_lookup(prefix->entries, nbr); + + fsm_msg->packet_type = EIGRP_OPC_UPDATE; + fsm_msg->eigrp = eigrp; + fsm_msg->data_type = EIGRP_TLV_IPv4_INT; + fsm_msg->adv_router = nbr; + fsm_msg->data.ipv4_int_type = tlv_max; + fsm_msg->entry = entry; + fsm_msg->prefix = prefix; + + /* send message to FSM */ + int event = eigrp_get_fsm_event(fsm_msg); + eigrp_fsm_event(fsm_msg, event); + + /* free memory used by TLV */ + eigrp_IPv4_InternalTLV_free (tlv_max); + } +} + +/* + * EIGRP UPDATE read function + */ +void +eigrp_update_receive (struct eigrp *eigrp, struct ip *iph, struct eigrp_header *eigrph, + struct stream * s, struct eigrp_interface *ei, int size) +{ + struct eigrp_neighbor *nbr; + struct TLV_IPv4_Internal_type *tlv; + struct eigrp_prefix_entry *pe; + struct eigrp_neighbor_entry *ne; + u_int32_t flags; + u_int16_t type; + u_char same; + struct access_list *alist; + struct prefix_list *plist; + struct eigrp *e; + u_char graceful_restart; + u_char graceful_restart_final; + struct list *nbr_prefixes; + + /* increment statistics. */ + ei->update_in++; + + /* get neighbor struct */ + nbr = eigrp_nbr_get(ei, eigrph, iph); + + /* neighbor must be valid, eigrp_nbr_get creates if none existed */ + assert(nbr); + + flags = ntohl(eigrph->flags); + + if (flags & EIGRP_CR_FLAG) + { + return; + } + + same = 0; + graceful_restart = 0; + graceful_restart_final = 0; + if((nbr->recv_sequence_number) == (ntohl(eigrph->sequence))) + same = 1; + + nbr->recv_sequence_number = ntohl(eigrph->sequence); + if (IS_DEBUG_EIGRP_PACKET(0, RECV)) + zlog_debug("Processing Update size[%u] int(%s) nbr(%s) seq [%u] flags [%0x]", + size, ifindex2ifname(nbr->ei->ifp->ifindex), + inet_ntoa(nbr->src), + nbr->recv_sequence_number, flags); + + + if((flags == (EIGRP_INIT_FLAG+EIGRP_RS_FLAG+EIGRP_EOT_FLAG)) && (!same)) + { + /* Graceful restart Update received with all routes */ + + zlog_info("Neighbor %s (%s) is resync: peer graceful-restart", + inet_ntoa(nbr->src), ifindex2ifname(nbr->ei->ifp->ifindex)); + + /* get all prefixes from neighbor from topology table */ + nbr_prefixes = eigrp_neighbor_prefixes_lookup(eigrp, nbr); + graceful_restart = 1; + graceful_restart_final = 1; + } + else if((flags == (EIGRP_INIT_FLAG+EIGRP_RS_FLAG)) && (!same)) + { + /* Graceful restart Update received, routes also in next packet */ + + zlog_info("Neighbor %s (%s) is resync: peer graceful-restart", + inet_ntoa(nbr->src), ifindex2ifname(nbr->ei->ifp->ifindex)); + + /* get all prefixes from neighbor from topology table */ + nbr_prefixes = eigrp_neighbor_prefixes_lookup(eigrp, nbr); + /* save prefixes to neighbor for later use */ + nbr->nbr_gr_prefixes = nbr_prefixes; + graceful_restart = 1; + graceful_restart_final = 0; + } + else if((flags == (EIGRP_EOT_FLAG)) && (!same)) + { + /* If there was INIT+RS Update packet before, + * consider this as GR EOT */ + + if(nbr->nbr_gr_prefixes != NULL) + { + /* this is final packet of GR */ + nbr_prefixes = nbr->nbr_gr_prefixes; + nbr->nbr_gr_prefixes = NULL; + + graceful_restart = 1; + graceful_restart_final = 1; + } + + } + else if((flags == (0)) && (!same)) + { + /* If there was INIT+RS Update packet before, + * consider this as GR not final packet */ + + if(nbr->nbr_gr_prefixes != NULL) + { + /* this is GR not final route packet */ + nbr_prefixes = nbr->nbr_gr_prefixes; + + graceful_restart = 1; + graceful_restart_final = 0; + } + + } + else if((flags & EIGRP_INIT_FLAG) && (!same)) + { /* When in pending state, send INIT update only if it wasn't + already sent before (only if init_sequence is 0) */ + if((nbr->state == EIGRP_NEIGHBOR_PENDING) && (nbr->init_sequence_number == 0)) + eigrp_update_send_init(nbr); + + if (nbr->state == EIGRP_NEIGHBOR_UP) + { + eigrp_nbr_state_set(nbr, EIGRP_NEIGHBOR_DOWN); + eigrp_topology_neighbor_down(nbr->ei->eigrp,nbr); + nbr->recv_sequence_number = ntohl(eigrph->sequence); + zlog_info("Neighbor %s (%s) is down: peer restarted", + inet_ntoa(nbr->src), ifindex2ifname(nbr->ei->ifp->ifindex)); + eigrp_nbr_state_set(nbr, EIGRP_NEIGHBOR_PENDING); + zlog_info("Neighbor %s (%s) is pending: new adjacency", + inet_ntoa(nbr->src), ifindex2ifname(nbr->ei->ifp->ifindex)); + eigrp_update_send_init(nbr); + } + } + + /*If there is topology information*/ + while (s->endp > s->getp) + { + type = stream_getw(s); + if (type == EIGRP_TLV_IPv4_INT) + { + stream_set_getp(s, s->getp - sizeof(u_int16_t)); + + tlv = eigrp_read_ipv4_tlv(s); + + /*searching if destination exists */ + struct prefix_ipv4 *dest_addr; + dest_addr = prefix_ipv4_new(); + dest_addr->prefix = tlv->destination; + dest_addr->prefixlen = tlv->prefix_length; + struct eigrp_prefix_entry *dest = eigrp_topology_table_lookup_ipv4( + eigrp->topology_table, dest_addr); + + /*if exists it comes to DUAL*/ + if (dest != NULL) + { + /* remove received prefix from neighbor prefix list if in GR */ + if(graceful_restart) + remove_received_prefix_gr(nbr_prefixes, dest); + + struct eigrp_fsm_action_message *msg; + msg = XCALLOC(MTYPE_EIGRP_FSM_MSG, + sizeof(struct eigrp_fsm_action_message)); + struct eigrp_neighbor_entry *entry = + eigrp_prefix_entry_lookup(dest->entries, nbr); + + msg->packet_type = EIGRP_OPC_UPDATE; + msg->eigrp = eigrp; + msg->data_type = EIGRP_TLV_IPv4_INT; + msg->adv_router = nbr; + msg->data.ipv4_int_type = tlv; + msg->entry = entry; + msg->prefix = dest; + int event = eigrp_get_fsm_event(msg); + eigrp_fsm_event(msg, event); + } + else + { + /*Here comes topology information save*/ + pe = eigrp_prefix_entry_new(); + pe->serno = eigrp->serno; + pe->destination_ipv4 = dest_addr; + pe->af = AF_INET; + pe->state = EIGRP_FSM_STATE_PASSIVE; + pe->nt = EIGRP_TOPOLOGY_TYPE_REMOTE; + + ne = eigrp_neighbor_entry_new(); + ne->ei = ei; + ne->adv_router = nbr; + ne->reported_metric = tlv->metric; + ne->reported_distance = + eigrp_calculate_metrics(eigrp, + &tlv->metric); + /* + * Filtering + */ + e = eigrp_lookup(); + /* + * Check if there is any access-list on interface (IN direction) + * and set distance to max + */ + alist = ei->list[EIGRP_FILTER_IN]; + + if (alist) { + zlog_info ("ALIST PROC IN: %s", alist->name); + } else { + zlog_info("ALIST je prazdny"); + } + + /* Check if access-list fits */ + if (alist && access_list_apply (alist, + (struct prefix *) dest_addr) == FILTER_DENY) + { + /* If yes, set reported metric to Max */ + zlog_info("PROC IN: Nastavujem metriku na MAX"); + ne->reported_metric.delay = EIGRP_MAX_METRIC; + zlog_info("PROC IN Prefix: %s", inet_ntoa(dest_addr->prefix)); + } else { + zlog_info("PROC IN: NENastavujem metriku "); + ne->distance = eigrp_calculate_total_metrics(eigrp, ne); + } + + plist = e->prefix[EIGRP_FILTER_IN]; + + if (plist) { + zlog_info ("PLIST PROC IN: %s", plist->name); + } else { + zlog_info("PLIST PROC IN je prazdny"); + } + + /* Check if prefix-list fits */ + if (plist && prefix_list_apply (plist, + (struct prefix *) dest_addr) == FILTER_DENY) + { + /* If yes, set reported metric to Max */ + zlog_info("PLIST PROC IN: Nastavujem metriku na MAX"); + ne->reported_metric.delay = EIGRP_MAX_METRIC; + zlog_info("PLIST PROC IN Prefix: %s", inet_ntoa(dest_addr->prefix)); + } else { + zlog_info("PLIST PROC IN: NENastavujem metriku "); + } + + /*Get access-list from current interface */ + zlog_info("Checking access_list on interface: %s",ei->ifp->name); + alist = ei->list[EIGRP_FILTER_IN]; + if (alist) { + zlog_info ("ALIST INT IN: %s", alist->name); + } else { + zlog_info("ALIST INT IN je prazdny"); + } + + /* Check if access-list fits */ + if (alist && access_list_apply (alist, (struct prefix *) dest_addr) == FILTER_DENY) + { + /* If yes, set reported metric to Max */ + zlog_info("INT IN: Nastavujem metriku na MAX"); + ne->reported_metric.delay = EIGRP_MAX_METRIC; + zlog_info("INT IN Prefix: %s", inet_ntoa(dest_addr->prefix)); + } else { + zlog_info("INT IN: NENastavujem metriku "); + } + + plist = ei->prefix[EIGRP_FILTER_IN]; + + if (plist) { + zlog_info ("PLIST INT IN: %s", plist->name); + } else { + zlog_info("PLIST INT IN je prazdny"); + } + + /* Check if prefix-list fits */ + if (plist && prefix_list_apply (plist, + (struct prefix *) dest_addr) == FILTER_DENY) + { + /* If yes, set reported metric to Max */ + zlog_info("PLIST INT IN: Nastavujem metriku na MAX"); + ne->reported_metric.delay = EIGRP_MAX_METRIC; + zlog_info("PLIST INT IN Prefix: %s", inet_ntoa(dest_addr->prefix)); + } else { + zlog_info("PLIST INT IN: NENastavujem metriku "); + } + /* + * End of filtering + */ + + ne->distance = eigrp_calculate_total_metrics(eigrp, ne); + + zlog_info("<DEBUG PROC IN Distance: %x", ne->distance); + zlog_info("<DEBUG PROC IN Delay: %x", ne->total_metric.delay); + + pe->fdistance = pe->distance = pe->rdistance = + ne->distance; + ne->prefix = pe; + ne->flags = EIGRP_NEIGHBOR_ENTRY_SUCCESSOR_FLAG; + + eigrp_prefix_entry_add(eigrp->topology_table, pe); + eigrp_neighbor_entry_add(pe, ne); + pe->distance = pe->fdistance = pe->rdistance = + ne->distance; + pe->reported_metric = ne->total_metric; + eigrp_topology_update_node_flags(pe); + + pe->req_action |= EIGRP_FSM_NEED_UPDATE; + listnode_add(eigrp->topology_changes_internalIPV4, pe); + } + eigrp_IPv4_InternalTLV_free (tlv); + } + } + + /* ask about prefixes not present in GR update, + * if this is final GR packet */ + if(graceful_restart_final) + { + eigrp_update_receive_GR_ask(eigrp, nbr, nbr_prefixes); + } + + /* + * We don't need to send separate Ack for INIT Update. INIT will be acked in EOT Update. + */ + if ((nbr->state == EIGRP_NEIGHBOR_UP) && !(flags == EIGRP_INIT_FLAG)) + { + eigrp_hello_send_ack(nbr); + } + + eigrp_query_send_all(eigrp); + eigrp_update_send_all(eigrp, ei); +} + +/*send EIGRP Update packet*/ +void +eigrp_update_send_init (struct eigrp_neighbor *nbr) +{ + struct eigrp_packet *ep; + u_int16_t length = EIGRP_HEADER_LEN; + + ep = eigrp_packet_new(nbr->ei->ifp->mtu); + + /* Prepare EIGRP INIT UPDATE header */ + if (IS_DEBUG_EIGRP_PACKET(0, RECV)) + zlog_debug("Enqueuing Update Init Seq [%u] Ack [%u]", + nbr->ei->eigrp->sequence_number, + nbr->recv_sequence_number); + + eigrp_packet_header_init(EIGRP_OPC_UPDATE, nbr->ei, ep->s, EIGRP_INIT_FLAG, + nbr->ei->eigrp->sequence_number, + nbr->recv_sequence_number); + + // encode Authentication TLV, if needed + if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) && (IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL)) + { + length += eigrp_add_authTLV_MD5_to_stream(ep->s,nbr->ei); + eigrp_make_md5_digest(nbr->ei,ep->s, EIGRP_AUTH_UPDATE_INIT_FLAG); + } + + /* EIGRP Checksum */ + eigrp_packet_checksum(nbr->ei, ep->s, length); + + ep->length = length; + ep->dst.s_addr = nbr->src.s_addr; + + /*This ack number we await from neighbor*/ + nbr->init_sequence_number = nbr->ei->eigrp->sequence_number; + ep->sequence_number = nbr->ei->eigrp->sequence_number; + if (IS_DEBUG_EIGRP_PACKET(0, RECV)) + zlog_debug("Enqueuing Update Init Len [%u] Seq [%u] Dest [%s]", + ep->length, ep->sequence_number, inet_ntoa(ep->dst)); + + /*Put packet to retransmission queue*/ + eigrp_fifo_push_head(nbr->retrans_queue, ep); + + if (nbr->retrans_queue->count == 1) + { + eigrp_send_packet_reliably(nbr); + } +} + +void +eigrp_update_send_EOT (struct eigrp_neighbor *nbr) +{ + struct eigrp_packet *ep; +// struct eigrp_packet *ep_multicast; + u_int16_t length = EIGRP_HEADER_LEN; + struct eigrp_neighbor_entry *te; + struct eigrp_prefix_entry *pe; + struct listnode *node, *node2, *nnode, *nnode2; + struct access_list *alist; + struct prefix_list *plist; + struct access_list *alist_i; + struct prefix_list *plist_i; + struct eigrp *e; + struct prefix_ipv4 *dest_addr; + + ep = eigrp_packet_new(nbr->ei->ifp->mtu); + + /* Prepare EIGRP EOT UPDATE header */ + eigrp_packet_header_init(EIGRP_OPC_UPDATE, nbr->ei, ep->s, EIGRP_EOT_FLAG, + nbr->ei->eigrp->sequence_number, + nbr->recv_sequence_number); + + // encode Authentication TLV, if needed + if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) && (IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL)) + { + length += eigrp_add_authTLV_MD5_to_stream(ep->s,nbr->ei); + } + + for (ALL_LIST_ELEMENTS(nbr->ei->eigrp->topology_table, node, nnode, pe)) + { + for (ALL_LIST_ELEMENTS(pe->entries, node2, nnode2, te)) + { + if ((te->ei == nbr->ei) + && (te->prefix->nt == EIGRP_TOPOLOGY_TYPE_REMOTE)) + continue; + + /* Get destination address from prefix */ + dest_addr = pe->destination_ipv4; + + /* + * Filtering + */ + //TODO: Work in progress + /* get list from eigrp process */ + e = eigrp_lookup(); + /* Get access-lists and prefix-lists from process and interface */ + alist = e->list[EIGRP_FILTER_OUT]; + plist = e->prefix[EIGRP_FILTER_OUT]; + alist_i = nbr->ei->list[EIGRP_FILTER_OUT]; + plist_i = nbr->ei->prefix[EIGRP_FILTER_OUT]; + + /* Check if any list fits */ + if ((alist && access_list_apply (alist, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (plist && prefix_list_apply (plist, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (alist_i && access_list_apply (alist_i, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (plist_i && prefix_list_apply (plist_i, + (struct prefix *) dest_addr) == FILTER_DENY)) + { + zlog_info("PROC OUT EOT: Skipping"); + //pe->reported_metric.delay = EIGRP_MAX_METRIC; + zlog_info("PROC OUT EOT Prefix: %s", inet_ntoa(dest_addr->prefix)); + continue; + } else { + zlog_info("PROC OUT EOT: NENastavujem metriku "); + length += eigrp_add_internalTLV_to_stream(ep->s, pe); + } + /* + * End of filtering + */ + + /* NULL the pointer */ + dest_addr = NULL; + + } + } + + if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) && (IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL)) + { + eigrp_make_md5_digest(nbr->ei,ep->s, EIGRP_AUTH_UPDATE_FLAG); + } + + /* EIGRP Checksum */ + eigrp_packet_checksum(nbr->ei, ep->s, length); + + ep->length = length; + ep->dst.s_addr = nbr->src.s_addr; + + /*This ack number we await from neighbor*/ + ep->sequence_number = nbr->ei->eigrp->sequence_number; + + if (IS_DEBUG_EIGRP_PACKET(0, RECV)) + zlog_debug("Enqueuing Update Init Len [%u] Seq [%u] Dest [%s]", + ep->length, ep->sequence_number, inet_ntoa(ep->dst)); + + /*Put packet to retransmission queue*/ + eigrp_fifo_push_head(nbr->retrans_queue, ep); + + if (nbr->retrans_queue->count == 1) + { + eigrp_send_packet_reliably(nbr); + } + +} + +void +eigrp_update_send (struct eigrp_interface *ei) +{ + struct eigrp_packet *ep; + struct listnode *node, *nnode; + struct eigrp_neighbor *nbr; + struct eigrp_prefix_entry *pe; + u_char has_tlv; + struct access_list *alist; + struct prefix_list *plist; + struct access_list *alist_i; + struct prefix_list *plist_i; + struct eigrp *e; + struct prefix_ipv4 *dest_addr; + + u_int16_t length = EIGRP_HEADER_LEN; + + ep = eigrp_packet_new(ei->ifp->mtu); + + /* Prepare EIGRP INIT UPDATE header */ + eigrp_packet_header_init(EIGRP_OPC_UPDATE, ei, ep->s, 0, + ei->eigrp->sequence_number, 0); + + // encode Authentication TLV, if needed + if((IF_DEF_PARAMS (ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) && (IF_DEF_PARAMS (ei->ifp)->auth_keychain != NULL)) + { + length += eigrp_add_authTLV_MD5_to_stream(ep->s,ei); + } + + has_tlv = 0; + for (ALL_LIST_ELEMENTS(ei->eigrp->topology_changes_internalIPV4, node, nnode, pe)) + { + if(pe->req_action & EIGRP_FSM_NEED_UPDATE) + { + /* Get destination address from prefix */ + dest_addr = pe->destination_ipv4; + + /* + * Filtering + */ + //TODO: Work in progress + /* get list from eigrp process */ + e = eigrp_lookup(); + /* Get access-lists and prefix-lists from process and interface */ + alist = e->list[EIGRP_FILTER_OUT]; + plist = e->prefix[EIGRP_FILTER_OUT]; + alist_i = ei->list[EIGRP_FILTER_OUT]; + plist_i = ei->prefix[EIGRP_FILTER_OUT]; + + /* Check if any list fits */ + if ((alist && access_list_apply (alist, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (plist && prefix_list_apply (plist, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (alist_i && access_list_apply (alist_i, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (plist_i && prefix_list_apply (plist_i, + (struct prefix *) dest_addr) == FILTER_DENY)) + { + zlog_info("PROC OUT: Skipping"); + //pe->reported_metric.delay = EIGRP_MAX_METRIC; + zlog_info("PROC OUT Prefix: %s", inet_ntoa(dest_addr->prefix)); + continue; + } else { + zlog_info("PROC OUT: NENastavujem metriku "); + length += eigrp_add_internalTLV_to_stream(ep->s, pe); + has_tlv = 1; + } + /* + * End of filtering + */ + + /* NULL the pointer */ + dest_addr = NULL; + + } + } + + if(!has_tlv) + { + eigrp_packet_free(ep); + return; + } + + if((IF_DEF_PARAMS (ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) && (IF_DEF_PARAMS (ei->ifp)->auth_keychain != NULL)) + { + eigrp_make_md5_digest(ei,ep->s, EIGRP_AUTH_UPDATE_FLAG); + } + + /* EIGRP Checksum */ + eigrp_packet_checksum(ei, ep->s, length); + ep->length = length; + + ep->dst.s_addr = htonl(EIGRP_MULTICAST_ADDRESS); + + /*This ack number we await from neighbor*/ + ep->sequence_number = ei->eigrp->sequence_number; + + if (IS_DEBUG_EIGRP_PACKET(0, RECV)) + zlog_debug("Enqueuing Update length[%u] Seq [%u]", + length, ep->sequence_number); + + for (ALL_LIST_ELEMENTS(ei->nbrs, node, nnode, nbr)) + { + if (nbr->state == EIGRP_NEIGHBOR_UP) + { + /*Put packet to retransmission queue*/ + eigrp_fifo_push_head(nbr->retrans_queue, ep); + + if (nbr->retrans_queue->count == 1) + { + eigrp_send_packet_reliably(nbr); + } + } + } +} + +void +eigrp_update_send_all (struct eigrp *eigrp, struct eigrp_interface *exception) +{ + + struct eigrp_interface *iface; + struct listnode *node, *node2, *nnode2; + struct eigrp_prefix_entry *pe; + + for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, iface)) + { + if (iface != exception) + { + eigrp_update_send(iface); + } + } + + for (ALL_LIST_ELEMENTS(eigrp->topology_changes_internalIPV4, node2, nnode2, pe)) + { + if(pe->req_action & EIGRP_FSM_NEED_UPDATE) + { + pe->req_action &= ~EIGRP_FSM_NEED_UPDATE; + listnode_delete(eigrp->topology_changes_internalIPV4, pe); + zlog_debug("UPDATE COUNT: %d", eigrp->topology_changes_internalIPV4->count); + } + } +} + +/** + * @fn eigrp_update_send_GR_part + * + * @param[in] nbr contains neighbor who would receive Graceful restart + * + * @return void + * + * @par + * Function used for sending Graceful restart Update packet + * and if there are multiple chunks, send only one of them. + * It is called from thread. Do not call it directly. + * + * Uses nbr_gr_packet_type from neighbor. + */ +static void +eigrp_update_send_GR_part(struct eigrp_neighbor *nbr) +{ + struct eigrp_packet *ep; + u_int16_t length = EIGRP_HEADER_LEN; + struct listnode *node, *nnode; + struct eigrp_prefix_entry *pe; + struct prefix_ipv4 *dest_addr; + struct eigrp *e; + struct access_list *alist, *alist_i; + struct prefix_list *plist, *plist_i; + struct list *prefixes; + u_int32_t flags; + unsigned int send_prefixes; + struct TLV_IPv4_Internal_type *tlv_max; + + /* get prefixes to send to neighbor */ + prefixes = nbr->nbr_gr_prefixes_send; + + send_prefixes = 0; + length = EIGRP_HEADER_LEN; + + /* if there already were last packet chunk, we won't continue */ + if(nbr->nbr_gr_packet_type == EIGRP_PACKET_PART_LAST) + return; + + /* if this is first packet chunk, we need to decide, + * if there will be one or more chunks */ + if(nbr->nbr_gr_packet_type == EIGRP_PACKET_PART_FIRST) + { + if(prefixes->count <= EIGRP_TLV_MAX_IPv4) + { + /* there will be only one chunk */ + flags = EIGRP_INIT_FLAG + EIGRP_RS_FLAG + EIGRP_EOT_FLAG; + nbr->nbr_gr_packet_type = EIGRP_PACKET_PART_LAST; + } + else + { + /* there will be more chunks */ + flags = EIGRP_INIT_FLAG + EIGRP_RS_FLAG; + nbr->nbr_gr_packet_type = EIGRP_PACKET_PART_NA; + } + } + else + { + /* this is not first chunk, and we need to decide, + * if there will be more chunks */ + if(prefixes->count <= EIGRP_TLV_MAX_IPv4) + { + /* this is last chunk */ + flags = EIGRP_EOT_FLAG; + nbr->nbr_gr_packet_type = EIGRP_PACKET_PART_LAST; + } + else + { + /* there will be more chunks */ + flags = 0; + nbr->nbr_gr_packet_type = EIGRP_PACKET_PART_NA; + } + } + + ep = eigrp_packet_new(nbr->ei->ifp->mtu); + + /* Prepare EIGRP Graceful restart UPDATE header */ + eigrp_packet_header_init(EIGRP_OPC_UPDATE, nbr->ei, ep->s, + flags, + nbr->ei->eigrp->sequence_number, + nbr->recv_sequence_number); + + // encode Authentication TLV, if needed + if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) && (IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL)) + { + length += eigrp_add_authTLV_MD5_to_stream(ep->s,nbr->ei); + } + + for (ALL_LIST_ELEMENTS(nbr->ei->eigrp->topology_table, node, nnode, pe)) + { + + /* + * Filtering + */ + dest_addr = pe->destination_ipv4; + /* get list from eigrp process */ + e = eigrp_lookup(); + /* Get access-lists and prefix-lists from process and interface */ + alist = e->list[EIGRP_FILTER_OUT]; + plist = e->prefix[EIGRP_FILTER_OUT]; + alist_i = nbr->ei->list[EIGRP_FILTER_OUT]; + plist_i = nbr->ei->prefix[EIGRP_FILTER_OUT]; + + + /* Check if any list fits */ + if ((alist && access_list_apply (alist, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (plist && prefix_list_apply (plist, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (alist_i && access_list_apply (alist_i, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (plist_i && prefix_list_apply (plist_i, + (struct prefix *) dest_addr) == FILTER_DENY)) + { + /* do not send filtered route */ + zlog_info("Filtered prefix %s won't be sent out.", + inet_ntoa(dest_addr->prefix)); + } + else + { + /* sending route which wasn't filtered */ + length += eigrp_add_internalTLV_to_stream(ep->s, pe); + send_prefixes++; + } + + + + alist = e->list[EIGRP_FILTER_IN]; + plist = e->prefix[EIGRP_FILTER_IN]; + alist_i = nbr->ei->list[EIGRP_FILTER_IN]; + plist_i = nbr->ei->prefix[EIGRP_FILTER_IN]; + + + /* Check if any list fits */ + if ((alist && access_list_apply (alist, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (plist && prefix_list_apply (plist, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (alist_i && access_list_apply (alist_i, + (struct prefix *) dest_addr) == FILTER_DENY)|| + (plist_i && prefix_list_apply (plist_i, + (struct prefix *) dest_addr) == FILTER_DENY)) + { + /* do not send filtered route */ + zlog_info("Filtered prefix %s will be removed.", + inet_ntoa(dest_addr->prefix)); + + tlv_max = eigrp_IPv4_InternalTLV_new(); + tlv_max->type = EIGRP_TLV_IPv4_INT; + tlv_max->length = 28U; + tlv_max->metric = pe->reported_metric; + /* set delay to MAX */ + tlv_max->metric.delay = EIGRP_MAX_METRIC; + tlv_max->destination = pe->destination_ipv4->prefix; + tlv_max->prefix_length = pe->destination_ipv4->prefixlen; + + + /* prepare message for FSM */ + struct eigrp_fsm_action_message *fsm_msg; + fsm_msg = XCALLOC(MTYPE_EIGRP_FSM_MSG, + sizeof(struct eigrp_fsm_action_message)); + + struct eigrp_neighbor_entry *entry = + eigrp_prefix_entry_lookup(pe->entries, nbr); + + fsm_msg->packet_type = EIGRP_OPC_UPDATE; + fsm_msg->eigrp = e; + fsm_msg->data_type = EIGRP_TLV_IPv4_INT; + fsm_msg->adv_router = nbr; + fsm_msg->data.ipv4_int_type = tlv_max; + fsm_msg->entry = entry; + fsm_msg->prefix = pe; + + /* send message to FSM */ + int event = eigrp_get_fsm_event(fsm_msg); + eigrp_fsm_event(fsm_msg, event); + + /* free memory used by TLV */ + eigrp_IPv4_InternalTLV_free (tlv_max); + } + /* + * End of filtering + */ + + /* NULL the pointer */ + dest_addr = NULL; + + /* delete processed prefix from list */ + listnode_delete(prefixes, pe); + + /* if there are enough prefixes, send packet */ + if(send_prefixes >= EIGRP_TLV_MAX_IPv4) + break; + } + + /* compute Auth digest */ + if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) && (IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL)) + { + eigrp_make_md5_digest(nbr->ei,ep->s, EIGRP_AUTH_UPDATE_FLAG); + } + + /* EIGRP Checksum */ + eigrp_packet_checksum(nbr->ei, ep->s, length); + + ep->length = length; + ep->dst.s_addr = nbr->src.s_addr; + + /*This ack number we await from neighbor*/ + ep->sequence_number = nbr->ei->eigrp->sequence_number; + + if (IS_DEBUG_EIGRP_PACKET(0, RECV)) + zlog_debug("Enqueuing Update Init Len [%u] Seq [%u] Dest [%s]", + ep->length, ep->sequence_number, inet_ntoa(ep->dst)); + + + /*Put packet to retransmission queue*/ + eigrp_fifo_push_head(nbr->retrans_queue, ep); + + if (nbr->retrans_queue->count == 1) + { + eigrp_send_packet_reliably(nbr); + } +} + +/** + * @fn eigrp_update_send_GR_thread + * + * @param[in] thread contains neighbor who would receive Graceful restart + * + * @return int always 0 + * + * @par + * Function used for sending Graceful restart Update packet + * in thread, it is prepared for multiple chunks of packet. + * + * Uses nbr_gr_packet_type and t_nbr_send_gr from neighbor. + */ +int +eigrp_update_send_GR_thread(struct thread *thread) +{ + struct eigrp_neighbor *nbr; + + /* get argument from thread */ + nbr = THREAD_ARG(thread); + /* remove this thread pointer */ + nbr->t_nbr_send_gr = NULL; + + /* if there is packet waiting in queue, + * schedule this thread again with small delay */ + if(nbr->retrans_queue->count > 0) + { + nbr->t_nbr_send_gr = thread_add_timer_msec(master, eigrp_update_send_GR_thread, nbr, 10); + return 0; + } + + /* send GR EIGRP packet chunk */ + eigrp_update_send_GR_part(nbr); + + /* if it wasn't last chunk, schedule this thread again */ + if(nbr->nbr_gr_packet_type != EIGRP_PACKET_PART_LAST) + nbr->t_nbr_send_gr = thread_execute(master, eigrp_update_send_GR_thread, nbr, 0); + + return 0; +} + +/** + * @fn eigrp_update_send_GR + * + * @param[in] nbr Neighbor who would receive Graceful restart + * @param[in] gr_type Who executed Graceful restart + * @param[in] vty Virtual terminal for log output + * + * @return void + * + * @par + * Function used for sending Graceful restart Update packet: + * Creates Update packet with INIT, RS, EOT flags and include + * all route except those filtered + */ +void +eigrp_update_send_GR (struct eigrp_neighbor *nbr, enum GR_type gr_type, struct vty *vty) +{ + struct eigrp_prefix_entry *pe2; + struct listnode *node2, *nnode2; + struct list *prefixes; + + if(gr_type == EIGRP_GR_FILTER) + { + /* function was called after applying filtration */ + zlog_info("Neighbor %s (%s) is resync: route configuration changed", + inet_ntoa(nbr->src), ifindex2ifname(nbr->ei->ifp->ifindex)); + } + else if(gr_type == EIGRP_GR_MANUAL) + { + /* Graceful restart was called manually */ + zlog_info("Neighbor %s (%s) is resync: manually cleared", + inet_ntoa(nbr->src), ifindex2ifname(nbr->ei->ifp->ifindex)); + + if(vty != NULL) + { + vty_time_print (vty, 0); + vty_out (vty, "Neighbor %s (%s) is resync: manually cleared%s", + inet_ntoa (nbr->src), + ifindex2ifname (nbr->ei->ifp->ifindex), + VTY_NEWLINE); + } + } + + prefixes = list_new(); + /* add all prefixes from topology table to list */ + for (ALL_LIST_ELEMENTS(nbr->ei->eigrp->topology_table, node2, nnode2, pe2)) + { + listnode_add(prefixes, pe2); + } + + /* save prefixes to neighbor */ + nbr->nbr_gr_prefixes_send = prefixes; + /* indicate, that this is first GR Update packet chunk */ + nbr->nbr_gr_packet_type = EIGRP_PACKET_PART_FIRST; + /* execute packet sending in thread */ + nbr->t_nbr_send_gr = thread_execute(master, eigrp_update_send_GR_thread, nbr, 0); +} + +/** + * @fn eigrp_update_send_interface_GR + * + * @param[in] ei Interface to neighbors of which the GR is sent + * @param[in] gr_type Who executed Graceful restart + * @param[in] vty Virtual terminal for log output + * + * @return void + * + * @par + * Function used for sending Graceful restart Update packet + * to all neighbors on specified interface. + */ +void +eigrp_update_send_interface_GR (struct eigrp_interface *ei, enum GR_type gr_type, struct vty *vty) +{ + struct listnode *node; + struct eigrp_neighbor *nbr; + + /* iterate over all neighbors on eigrp interface */ + for (ALL_LIST_ELEMENTS_RO(ei->nbrs, node, nbr)) + { + /* send GR to neighbor */ + eigrp_update_send_GR(nbr, gr_type, vty); + } +} + +/** + * @fn eigrp_update_send_process_GR + * + * @param[in] eigrp EIGRP process + * @param[in] gr_type Who executed Graceful restart + * @param[in] vty Virtual terminal for log output + * + * @return void + * + * @par + * Function used for sending Graceful restart Update packet + * to all neighbors in eigrp process. + */ +void +eigrp_update_send_process_GR (struct eigrp *eigrp, enum GR_type gr_type, struct vty *vty) +{ + struct listnode *node; + struct eigrp_interface *ei; + + /* iterate over all eigrp interfaces */ + for (ALL_LIST_ELEMENTS_RO (eigrp->eiflist, node, ei)) + { + /* send GR to all neighbors on interface */ + eigrp_update_send_interface_GR(ei, gr_type, vty); + } +} + + |