1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2020 Alexander V. Chernikov 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 /* 31 * This header file contains private definitions for nexthop routing. 32 * 33 * Header is not intended to be included by the code external to the 34 * routing subsystem. 35 */ 36 37 #ifndef _NET_ROUTE_NHOP_VAR_H_ 38 #define _NET_ROUTE_NHOP_VAR_H_ 39 40 MALLOC_DECLARE(M_NHOP); 41 42 /* define nhop hash table */ 43 struct nhop_priv; 44 CHT_SLIST_DEFINE(nhops, struct nhop_priv); 45 /* produce hash value for an object */ 46 #define nhops_hash_obj(_obj) hash_priv(_obj) 47 /* compare two objects */ 48 #define nhops_cmp(_one, _two) cmp_priv(_one, _two) 49 /* next object accessor */ 50 #define nhops_next(_obj) (_obj)->nh_next 51 52 /* define multipath hash table */ 53 struct nhgrp_priv; 54 CHT_SLIST_DEFINE(nhgroups, struct nhgrp_priv); 55 56 struct nh_control { 57 struct nhops_head nh_head; /* hash table head */ 58 struct bitmask_head nh_idx_head; /* nhop index head */ 59 struct nhgroups_head gr_head; /* nhgrp hash table head */ 60 struct bitmask_head gr_idx_head; /* nhgrp index head */ 61 struct rwlock ctl_lock; /* overall ctl lock */ 62 struct rib_head *ctl_rh; /* pointer back to rnh */ 63 struct epoch_context ctl_epoch_ctx; /* epoch ctl helper */ 64 }; 65 66 #define NHOPS_WLOCK(ctl) rw_wlock(&(ctl)->ctl_lock) 67 #define NHOPS_RLOCK(ctl) rw_rlock(&(ctl)->ctl_lock) 68 #define NHOPS_WUNLOCK(ctl) rw_wunlock(&(ctl)->ctl_lock) 69 #define NHOPS_RUNLOCK(ctl) rw_runlock(&(ctl)->ctl_lock) 70 #define NHOPS_LOCK_INIT(ctl) rw_init(&(ctl)->ctl_lock, "nhop_ctl") 71 #define NHOPS_LOCK_DESTROY(ctl) rw_destroy(&(ctl)->ctl_lock) 72 #define NHOPS_WLOCK_ASSERT(ctl) rw_assert(&(ctl)->ctl_lock, RA_WLOCKED) 73 74 /* Control plane-only nhop data */ 75 struct nhop_object; 76 struct nhop_priv { 77 /* nhop lookup comparison start */ 78 uint8_t nh_family; /* address family of the lookup */ 79 uint8_t spare; 80 uint16_t nh_type; /* nexthop type */ 81 uint32_t rt_flags; /* routing flags for the control plane */ 82 /* nhop lookup comparison end */ 83 uint32_t nh_idx; /* nexthop index */ 84 void *cb_func; /* function handling additional rewrite caps */ 85 u_int nh_refcnt; /* number of references, refcount(9) */ 86 u_int nh_linked; /* refcount(9), == 2 if linked to the list */ 87 struct nhop_object *nh; /* backreference to the dataplane nhop */ 88 struct nh_control *nh_control; /* backreference to the rnh */ 89 struct nhop_priv *nh_next; /* hash table membership */ 90 struct vnet *nh_vnet; /* vnet nhop belongs to */ 91 struct epoch_context nh_epoch_ctx; /* epoch data for nhop */ 92 }; 93 94 #define NH_PRIV_END_CMP (__offsetof(struct nhop_priv, nh_idx)) 95 96 #define NH_IS_PINNED(_nh) ((!NH_IS_NHGRP(_nh)) && \ 97 ((_nh)->nh_priv->rt_flags & RTF_PINNED)) 98 99 /* nhop.c */ 100 struct nhop_priv *find_nhop(struct nh_control *ctl, 101 const struct nhop_priv *nh_priv); 102 int link_nhop(struct nh_control *ctl, struct nhop_priv *nh_priv); 103 struct nhop_priv *unlink_nhop(struct nh_control *ctl, struct nhop_priv *nh_priv); 104 105 /* nhop_ctl.c */ 106 int cmp_priv(const struct nhop_priv *_one, const struct nhop_priv *_two); 107 108 #endif 109