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Diffstat (limited to '')
-rw-r--r-- | eigrpd/eigrp_reply.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/eigrpd/eigrp_reply.c b/eigrpd/eigrp_reply.c new file mode 100644 index 0000000..015daa7 --- /dev/null +++ b/eigrpd/eigrp_reply.c @@ -0,0 +1,203 @@ +/* + * Eigrp Sending and Receiving EIGRP Reply 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 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 "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 "keychain.h" +#include "plist.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_errors.h" + +void eigrp_send_reply(struct eigrp_neighbor *nbr, + struct eigrp_prefix_descriptor *pe) +{ + struct eigrp_packet *ep; + uint16_t length = EIGRP_HEADER_LEN; + struct eigrp_interface *ei = nbr->ei; + struct eigrp *eigrp = ei->eigrp; + struct eigrp_prefix_descriptor *pe2; + + // TODO: Work in progress + /* Filtering */ + /* get list from eigrp process */ + pe2 = XCALLOC(MTYPE_EIGRP_PREFIX_DESCRIPTOR, + sizeof(struct eigrp_prefix_descriptor)); + memcpy(pe2, pe, sizeof(struct eigrp_prefix_descriptor)); + + if (eigrp_update_prefix_apply(eigrp, ei, EIGRP_FILTER_OUT, + pe2->destination)) { + zlog_info("REPLY SEND: Setting Metric to max"); + pe2->reported_metric.delay = EIGRP_MAX_METRIC; + } + + /* + * End of filtering + */ + + ep = eigrp_packet_new(EIGRP_PACKET_MTU(ei->ifp->mtu), nbr); + + /* Prepare EIGRP INIT UPDATE header */ + eigrp_packet_header_init(EIGRP_OPC_REPLY, eigrp, ep->s, 0, + eigrp->sequence_number, 0); + + // encode Authentication TLV, if needed + if (ei->params.auth_type == EIGRP_AUTH_TYPE_MD5 + && (ei->params.auth_keychain != NULL)) { + length += eigrp_add_authTLV_MD5_to_stream(ep->s, ei); + } + + + length += eigrp_add_internalTLV_to_stream(ep->s, pe2); + + if ((ei->params.auth_type == EIGRP_AUTH_TYPE_MD5) + && (ei->params.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 = nbr->src.s_addr; + + /*This ack number we await from neighbor*/ + ep->sequence_number = eigrp->sequence_number; + + /*Put packet to retransmission queue*/ + eigrp_fifo_push(nbr->retrans_queue, ep); + + if (nbr->retrans_queue->count == 1) { + eigrp_send_packet_reliably(nbr); + } + + XFREE(MTYPE_EIGRP_PREFIX_DESCRIPTOR, pe2); +} + +/*EIGRP REPLY read function*/ +void eigrp_reply_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; + + uint16_t type; + + /* increment statistics. */ + ei->reply_in++; + + /* get neighbor struct */ + nbr = eigrp_nbr_get(ei, eigrph, iph); + + /* neighbor must be valid, eigrp_nbr_get creates if none existed */ + assert(nbr); + + nbr->recv_sequence_number = ntohl(eigrph->sequence); + + while (s->endp > s->getp) { + type = stream_getw(s); + + if (type != EIGRP_TLV_IPv4_INT) + continue; + + struct prefix dest_addr; + + stream_set_getp(s, s->getp - sizeof(uint16_t)); + + tlv = eigrp_read_ipv4_tlv(s); + + dest_addr.family = AF_INET; + dest_addr.u.prefix4 = tlv->destination; + dest_addr.prefixlen = tlv->prefix_length; + struct eigrp_prefix_descriptor *dest = + eigrp_topology_table_lookup_ipv4(eigrp->topology_table, + &dest_addr); + /* + * Destination must exists + */ + if (!dest) { + flog_err( + EC_EIGRP_PACKET, + "%s: Received prefix %pFX which we do not know about", + __func__, &dest_addr); + eigrp_IPv4_InternalTLV_free(tlv); + continue; + } + + struct eigrp_fsm_action_message msg; + struct eigrp_route_descriptor *entry = + eigrp_route_descriptor_lookup(dest->entries, nbr); + + if (eigrp_update_prefix_apply(eigrp, ei, EIGRP_FILTER_IN, + &dest_addr)) { + tlv->metric.delay = EIGRP_MAX_METRIC; + } + /* + * End of filtering + */ + + msg.packet_type = EIGRP_OPC_REPLY; + msg.eigrp = eigrp; + msg.data_type = EIGRP_INT; + msg.adv_router = nbr; + msg.metrics = tlv->metric; + msg.entry = entry; + msg.prefix = dest; + eigrp_fsm_event(&msg); + + eigrp_IPv4_InternalTLV_free(tlv); + } + eigrp_hello_send_ack(nbr); +} |