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/* $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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} |