fedeb08b6a
This change is based on the nexthop objects landed in D24232.
The change introduces the concept of nexthop groups.
Each group contains the collection of nexthops with their
relative weights and a dataplane-optimized structure to enable
efficient nexthop selection.
Simular to the nexthops, nexthop groups are immutable. Dataplane part
gets compiled during group creation and is basically an array of
nexthop pointers, compiled w.r.t their weights.
With this change, `rt_nhop` field of `struct rtentry` contains either
nexthop or nexthop group. They are distinguished by the presense of
NHF_MULTIPATH flag.
All dataplane lookup functions returns pointer to the nexthop object,
leaving nexhop groups details inside routing subsystem.
User-visible changes:
The change is intended to be backward-compatible: all non-mpath operations
should work as before with ROUTE_MPATH and net.route.multipath=1.
All routes now comes with weight, default weight is 1, maximum is 2^24-1.
Current maximum multipath group width is statically set to 64.
This will become sysctl-tunable in the followup changes.
Using functionality:
* Recompile kernel with ROUTE_MPATH
* set net.route.multipath to 1
route add -6 2001:db8::/32 2001:db8::2 -weight 10
route add -6 2001:db8::/32 2001:db8::3 -weight 20
netstat -6On
Nexthop groups data
Internet6:
GrpIdx NhIdx Weight Slots Gateway Netif Refcnt
1 ------- ------- ------- --------------------------------------- --------- 1
13 10 1 2001:db8::2 vlan2
14 20 2 2001:db8::3 vlan2
Next steps:
* Land outbound hashing for locally-originated routes ( D26523 ).
* Fix net/bird multipath (net/frr seems to work fine)
* Add ROUTE_MPATH to GENERIC
* Set net.route.multipath=1 by default
Tested by: olivier
Reviewed by: glebius
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D26449
105 lines
4.0 KiB
C
105 lines
4.0 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 public functions and structures used for
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* routing table manipulations.
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*/
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#ifndef _NET_ROUTE_ROUTE_CTL_H_
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#define _NET_ROUTE_ROUTE_CTL_H_
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struct rib_cmd_info {
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uint8_t rc_cmd; /* RTM_ADD|RTM_DEL|RTM_CHANGE */
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uint8_t spare[3];
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uint32_t rc_nh_weight; /* new nhop weight */
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struct rtentry *rc_rt; /* Target entry */
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struct nhop_object *rc_nh_old; /* Target nhop OR mpath */
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struct nhop_object *rc_nh_new; /* Target nhop OR mpath */
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};
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int rib_add_route(uint32_t fibnum, struct rt_addrinfo *info,
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struct rib_cmd_info *rc);
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int rib_del_route(uint32_t fibnum, struct rt_addrinfo *info,
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struct rib_cmd_info *rc);
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int rib_change_route(uint32_t fibnum, struct rt_addrinfo *info,
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struct rib_cmd_info *rc);
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int rib_action(uint32_t fibnum, int action, struct rt_addrinfo *info,
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struct rib_cmd_info *rc);
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typedef void route_notification_t(struct rib_cmd_info *rc, void *);
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void rib_decompose_notification(struct rib_cmd_info *rc,
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route_notification_t *cb, void *cbdata);
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int rib_add_redirect(u_int fibnum, struct sockaddr *dst,
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struct sockaddr *gateway, struct sockaddr *author, struct ifnet *ifp,
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int flags, int expire_sec);
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typedef int rt_walktree_f_t(struct rtentry *, void *);
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void rib_walk(int af, u_int fibnum, rt_walktree_f_t *wa_f, void *arg);
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void rib_walk_del(u_int fibnum, int family, rt_filter_f_t *filter_f,
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void *arg, bool report);
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typedef void rt_setwarg_t(struct rib_head *, uint32_t, int, void *);
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void rt_foreach_fib_walk(int af, rt_setwarg_t *, rt_walktree_f_t *, void *);
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void rt_foreach_fib_walk_del(int af, rt_filter_f_t *filter_f, void *arg);
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struct route_nhop_data;
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const struct rtentry *rib_lookup_prefix(uint32_t fibnum, int family,
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const struct sockaddr *dst, const struct sockaddr *netmask,
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struct route_nhop_data *rnd);
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const struct rtentry *rib_lookup_lpm(uint32_t fibnum, int family,
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const struct sockaddr *dst, struct route_nhop_data *rnd);
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/* Multipath */
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struct nhgrp_object;
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struct weightened_nhop;
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struct weightened_nhop *nhgrp_get_nhops(struct nhgrp_object *nhg,
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uint32_t *pnum_nhops);
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enum rib_subscription_type {
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RIB_NOTIFY_IMMEDIATE,
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RIB_NOTIFY_DELAYED
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};
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struct rib_subscription;
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typedef void rib_subscription_cb_t(struct rib_head *rnh, struct rib_cmd_info *rc,
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void *arg);
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struct rib_subscription *rib_subscribe(uint32_t fibnum, int family,
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rib_subscription_cb_t *f, void *arg, enum rib_subscription_type type,
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bool waitok);
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struct rib_subscription *rib_subscribe_internal(struct rib_head *rnh,
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rib_subscription_cb_t *f, void *arg, enum rib_subscription_type type,
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bool waitok);
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int rib_unsibscribe(uint32_t fibnum, int family, struct rib_subscription *rs);
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#endif
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