000250be0d
Routing daemons such as bird need to know if they install certain route so they can clean it up on startup, as a form of achieving consistent state during the crash recovery. Currently they use combination of routing flags (RTF_PROTO1) to detect these routes when interacting via route(4) rtsock protocol. Netlink protocol has a special "rtm_protocol" field that is filled and checked by the route originator. To prepare for the upcoming netlink introduction, add ability to record origing to both nexthops and nexthop groups via <nhop|nhgrp>_<get|set>_origin() KPI. The actual calls will be used in the followup commits. MFC after: 1 month
114 lines
4.5 KiB
C
114 lines
4.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2020 Alexander V. Chernikov
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* This header file contains private definitions for nexthop routing.
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*
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* Header is not intended to be included by the code external to the
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* routing subsystem.
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*/
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#ifndef _NET_ROUTE_NHOP_VAR_H_
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#define _NET_ROUTE_NHOP_VAR_H_
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MALLOC_DECLARE(M_NHOP);
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/* define nhop hash table */
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struct nhop_priv;
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CHT_SLIST_DEFINE(nhops, struct nhop_priv);
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/* produce hash value for an object */
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#define nhops_hash_obj(_obj) hash_priv(_obj)
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/* compare two objects */
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#define nhops_cmp(_one, _two) cmp_priv(_one, _two)
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/* next object accessor */
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#define nhops_next(_obj) (_obj)->nh_next
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/* define multipath hash table */
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struct nhgrp_priv;
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CHT_SLIST_DEFINE(nhgroups, struct nhgrp_priv);
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struct nh_control {
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struct nhops_head nh_head; /* hash table head */
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struct bitmask_head nh_idx_head; /* nhop index head */
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struct nhgroups_head gr_head; /* nhgrp hash table head */
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struct rwlock ctl_lock; /* overall ctl lock */
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struct rib_head *ctl_rh; /* pointer back to rnh */
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struct epoch_context ctl_epoch_ctx; /* epoch ctl helper */
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};
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#define NHOPS_WLOCK(ctl) rw_wlock(&(ctl)->ctl_lock)
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#define NHOPS_RLOCK(ctl) rw_rlock(&(ctl)->ctl_lock)
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#define NHOPS_WUNLOCK(ctl) rw_wunlock(&(ctl)->ctl_lock)
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#define NHOPS_RUNLOCK(ctl) rw_runlock(&(ctl)->ctl_lock)
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#define NHOPS_LOCK_INIT(ctl) rw_init(&(ctl)->ctl_lock, "nhop_ctl")
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#define NHOPS_LOCK_DESTROY(ctl) rw_destroy(&(ctl)->ctl_lock)
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#define NHOPS_WLOCK_ASSERT(ctl) rw_assert(&(ctl)->ctl_lock, RA_WLOCKED)
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/* Control plane-only nhop data */
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struct nhop_object;
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struct nhop_priv {
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/* nhop lookup comparison start */
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uint8_t nh_upper_family;/* address family of the lookup */
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uint8_t nh_neigh_family;/* neighbor address family */
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uint16_t nh_type; /* nexthop type */
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uint32_t rt_flags; /* routing flags for the control plane */
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uint32_t nh_expire; /* path expiration time */
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uint32_t nh_uidx; /* userland-provided index */
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/* nhop lookup comparison end */
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uint32_t nh_idx; /* nexthop index */
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uint32_t nh_fibnum; /* nexthop fib */
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void *cb_func; /* function handling additional rewrite caps */
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u_int nh_refcnt; /* number of references, refcount(9) */
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u_int nh_linked; /* refcount(9), == 2 if linked to the list */
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int nh_finalized; /* non-zero if finalized() was called */
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uint8_t nh_origin; /* protocol that originated the nexthop */
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struct nhop_object *nh; /* backreference to the dataplane nhop */
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struct nh_control *nh_control; /* backreference to the rnh */
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struct nhop_priv *nh_next; /* hash table membership */
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struct vnet *nh_vnet; /* vnet nhop belongs to */
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struct epoch_context nh_epoch_ctx; /* epoch data for nhop */
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};
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#define NH_PRIV_END_CMP (__offsetof(struct nhop_priv, nh_idx))
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#define NH_IS_PINNED(_nh) ((!NH_IS_NHGRP(_nh)) && \
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((_nh)->nh_priv->rt_flags & RTF_PINNED))
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#define NH_IS_LINKED(_nh) ((_nh)->nh_priv->nh_idx != 0)
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/* nhop.c */
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struct nhop_priv *find_nhop(struct nh_control *ctl,
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const struct nhop_priv *nh_priv);
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int link_nhop(struct nh_control *ctl, struct nhop_priv *nh_priv);
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struct nhop_priv *unlink_nhop(struct nh_control *ctl, struct nhop_priv *nh_priv);
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/* nhop_ctl.c */
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int cmp_priv(const struct nhop_priv *_one, const struct nhop_priv *_two);
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#endif
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