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2eb791426a
Some tunnel protocols, such as Geneve, have a bit in the tunnel header to indicate that it is an OAM packet. This means that the packet should be processed as a tunnel control frame and not be passed onto connected links. When BFD is used inside of a tunnel it is often used in this control capacity, so this adds an option to enable marking the outer header when the output port is a tunnel that supports the OAM concept. It is also possible to use tunnels as point-to-point links that are simply carrying BFD as payload, so this is not always turned on. Conceptually, this may also apply to other types of packets locally generated by the switch, most obviously CFM. However, BFD seems to be most commonly used for this type of tunnel monitoring application so this only adds the option to BFD for the time being to avoid unnecessarily adding configuration knobs that might never get used. Signed-off-by: Jesse Gross <jesse@kernel.org> Acked-by: Pravin B Shelar <pshelar@ovn.org>
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* Copyright (c) 2012 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License. */
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#ifndef BFD_H
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#define BFD_H 1
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#define BFD_PACKET_LEN 24
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#define BFD_DEST_PORT 3784
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#include <stdbool.h>
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#include <inttypes.h>
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#include "packets.h"
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struct bfd;
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struct dpif_flow_stats;
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struct flow;
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struct flow_wildcards;
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struct netdev;
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struct dp_packet;
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struct smap;
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long long int bfd_wait(const struct bfd *);
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void bfd_run(struct bfd *);
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bool bfd_should_send_packet(const struct bfd *);
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void bfd_put_packet(struct bfd *bfd, struct dp_packet *packet,
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const struct eth_addr eth_src, bool *oam);
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bool bfd_should_process_flow(const struct bfd *, const struct flow *,
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struct flow_wildcards *);
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void bfd_process_packet(struct bfd *, const struct flow *,
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const struct dp_packet *);
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void bfd_init(void);
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struct bfd *bfd_configure(struct bfd *, const char *name,
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const struct smap *smap,
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struct netdev *netdev);
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struct bfd *bfd_ref(const struct bfd *);
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void bfd_unref(struct bfd *);
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void bfd_account_rx(struct bfd *, const struct dpif_flow_stats *);
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bool bfd_forwarding(struct bfd *);
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bool bfd_check_status_change(struct bfd *);
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void bfd_get_status(const struct bfd *, struct smap *);
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void bfd_set_netdev(struct bfd *, const struct netdev *);
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long long int bfd_wake_time(const struct bfd *);
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#endif /* bfd.h */
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