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* If the MSDP peer receives the SA from a non-RPF peer towards the originating RP, it will drop the message. * SA messages are forwarded away from the RP address only. * SA messages are not forwarded within the mesh group. * Preventing the MSDP connection from being dropped due to RPF check failure (RFC3618, section 13 "MSDP Error Handling") Signed-off-by: Adriano Marto Reis <adrianomarto@gmail.com> Signed-off-by: Adriano Reis <areis@barrukka.local>
74 lines
3.2 KiB
C
74 lines
3.2 KiB
C
/*
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* IP MSDP packet helpers
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* Copyright (C) 2016 Cumulus Networks, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef PIM_MSDP_PACKET_H
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#define PIM_MSDP_PACKET_H
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/* type and length of a single tlv can be consider packet header */
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#define PIM_MSDP_HEADER_SIZE 3
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/* Keepalive TLV
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 4 | 3 |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define PIM_MSDP_KA_TLV_MAX_SIZE PIM_MSDP_HEADER_SIZE
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/* Source-Active TLV (x=8, y=12xEntryCount)
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 1 | x + y | Entry Count |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| RP Address |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Reserved | Sprefix Len | \
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ \
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| Group Address | ) z
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ /
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| Source Address | /
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define PIM_MSDP_SA_TLV_MAX_SIZE 9192
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#define PIM_MSDP_SA_X_SIZE 8
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#define PIM_MSDP_SA_ONE_ENTRY_SIZE 12
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#define PIM_MSDP_SA_Y_SIZE(entry_cnt) (PIM_MSDP_SA_ONE_ENTRY_SIZE * entry_cnt)
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#define PIM_MSDP_SA_ENTRY_CNT2SIZE(entry_cnt) \
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(PIM_MSDP_SA_X_SIZE + PIM_MSDP_SA_Y_SIZE(entry_cnt))
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/* SA TLV has to have atleast only one entry in it so x=8 + y=12 */
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#define PIM_MSDP_SA_TLV_MIN_SIZE PIM_MSDP_SA_ENTRY_CNT2SIZE(1)
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/* XXX: theoretically we can fix a max of 255 but that may result in packet
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* fragmentation */
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#define PIM_MSDP_SA_MAX_ENTRY_CNT 120
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#define PIM_MSDP_MAX_PACKET_SIZE max(PIM_MSDP_SA_TLV_MAX_SIZE, PIM_MSDP_KA_TLV_MAX_SIZE)
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#define PIM_MSDP_PKT_TYPE_STRLEN 16
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void pim_msdp_pkt_ka_tx(struct pim_msdp_peer *mp);
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int pim_msdp_read(struct thread *thread);
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void pim_msdp_pkt_sa_tx(struct pim_instance *pim);
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void pim_msdp_pkt_sa_tx_one(struct pim_msdp_sa *sa);
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void pim_msdp_pkt_sa_tx_to_one_peer(struct pim_msdp_peer *mp);
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void pim_msdp_pkt_sa_tx_one_to_one_peer(struct pim_msdp_peer *mp,
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struct in_addr rp, struct prefix_sg sg);
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#endif
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