134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/* $OpenBSD: hello.c,v 1.5 2016/09/02 16:29:55 renato Exp $ */
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/*
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* Copyright (c) 2015 Renato Westphal <renato@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include "eigrpd.h"
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#include "eigrpe.h"
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#include "log.h"
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/* hello packet handling */
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void
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send_hello(struct eigrp_iface *ei, struct seq_addr_head *seq_addr_list,
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uint32_t mcast_seq)
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{
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struct eigrp *eigrp = ei->eigrp;
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struct ibuf *buf;
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uint8_t flags = 0;
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if ((buf = ibuf_dynamic(PKG_DEF_SIZE,
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IP_MAXPACKET - sizeof(struct ip))) == NULL)
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fatal("send_hello");
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/* EIGRP header */
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if (gen_eigrp_hdr(buf, EIGRP_OPC_HELLO, flags, 0, eigrp->as))
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goto fail;
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if (gen_parameter_tlv(buf, ei, 0))
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goto fail;
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if (gen_sw_version_tlv(buf))
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goto fail;
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if (seq_addr_list && !TAILQ_EMPTY(seq_addr_list) &&
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gen_sequence_tlv(buf, seq_addr_list))
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goto fail;
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if (mcast_seq && gen_mcast_seq_tlv(buf, mcast_seq))
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goto fail;
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/* send unreliably */
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send_packet(ei, NULL, 0, buf);
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ibuf_free(buf);
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return;
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fail:
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log_warnx("%s: failed to send message", __func__);
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ibuf_free(buf);
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}
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void
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send_peerterm(struct nbr *nbr)
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{
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struct eigrp *eigrp = nbr->ei->eigrp;
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struct ibuf *buf;
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uint8_t flags = 0;
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if ((buf = ibuf_dynamic(PKG_DEF_SIZE,
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IP_MAXPACKET - sizeof(struct ip))) == NULL)
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fatal("send_hello");
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/* EIGRP header */
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if (gen_eigrp_hdr(buf, EIGRP_OPC_HELLO, flags, 0, eigrp->as))
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goto fail;
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if (gen_parameter_tlv(buf, nbr->ei, 1))
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goto fail;
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/* send unreliably */
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send_packet(nbr->ei, nbr, 0, buf);
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ibuf_free(buf);
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return;
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fail:
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log_warnx("%s: failed to send message", __func__);
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ibuf_free(buf);
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}
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void
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recv_hello(struct eigrp_iface *ei, union eigrpd_addr *src, struct nbr *nbr,
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struct tlv_parameter *tp)
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{
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/*
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* Some old Cisco routers seems to use the "parameters tlv" with all
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* K-values set to 255 (except k6) to inform that the neighbor has been
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* reset. The "peer termination" tlv described in the draft for the same
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* purpose is probably something introduced recently. Let's check for
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* this case to maintain backward compatibility.
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*/
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if (tp->kvalues[0] == 255 && tp->kvalues[1] == 255 &&
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tp->kvalues[2] == 255 && tp->kvalues[3] == 255 &&
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tp->kvalues[4] == 255 && tp->kvalues[5] == 0) {
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if (nbr) {
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log_debug("%s: peer temination", __func__);
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nbr_del(nbr);
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}
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return;
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}
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if (nbr == NULL) {
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if (memcmp(ei->eigrp->kvalues, tp->kvalues, 6) != 0) {
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log_debug("%s: k-values don't match (nbr %s)",
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__func__, log_addr(ei->eigrp->af, src));
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return;
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}
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nbr = nbr_new(ei, src, ntohs(tp->holdtime), 0);
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/* send an expedited hello */
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send_hello(ei, NULL, 0);
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send_update(nbr->ei, nbr, EIGRP_HDR_FLAG_INIT, NULL);
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}
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}
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