1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 28 /* 29 * This header file contains public functions and structures used for 30 * routing table manipulations. 31 */ 32 33 #ifndef _NET_ROUTE_ROUTE_CTL_H_ 34 #define _NET_ROUTE_ROUTE_CTL_H_ 35 36 struct rib_head *rt_tables_get_rnh_safe(uint32_t table, sa_family_t family); 37 38 struct rib_cmd_info { 39 uint8_t rc_cmd; /* RTM_ADD|RTM_DEL|RTM_CHANGE */ 40 uint8_t spare[3]; 41 uint32_t rc_nh_weight; /* new nhop weight */ 42 struct rtentry *rc_rt; /* Target entry */ 43 struct nhop_object *rc_nh_old; /* Target nhop OR mpath */ 44 struct nhop_object *rc_nh_new; /* Target nhop OR mpath */ 45 }; 46 47 struct route_nhop_data { 48 union { 49 struct nhop_object *rnd_nhop; 50 struct nhgrp_object *rnd_nhgrp; 51 }; 52 uint32_t rnd_weight; 53 }; 54 55 int rib_add_route_px(uint32_t fibnum, struct sockaddr *dst, int plen, 56 struct route_nhop_data *rnd, int op_flags, struct rib_cmd_info *rc); 57 int rib_del_route_px(uint32_t fibnum, struct sockaddr *dst, int plen, 58 rib_filter_f_t *filter_func, void *filter_arg, int op_flags, 59 struct rib_cmd_info *rc); 60 int rib_del_route_px_gw(uint32_t fibnum, struct sockaddr *dst, int plen, 61 const struct sockaddr *gw, int op_flags, struct rib_cmd_info *rc); 62 63 /* operation flags */ 64 #define RTM_F_CREATE 0x01 65 #define RTM_F_EXCL 0x02 66 #define RTM_F_REPLACE 0x04 67 #define RTM_F_APPEND 0x08 68 #define RTM_F_FORCE 0x10 69 70 int rib_add_route(uint32_t fibnum, struct rt_addrinfo *info, 71 struct rib_cmd_info *rc); 72 int rib_del_route(uint32_t fibnum, struct rt_addrinfo *info, 73 struct rib_cmd_info *rc); 74 int rib_change_route(uint32_t fibnum, struct rt_addrinfo *info, 75 struct rib_cmd_info *rc); 76 int rib_action(uint32_t fibnum, int action, struct rt_addrinfo *info, 77 struct rib_cmd_info *rc); 78 int rib_match_gw(const struct rtentry *rt, const struct nhop_object *nh, 79 void *_data); 80 int rib_handle_ifaddr_info(uint32_t fibnum, int cmd, struct rt_addrinfo *info); 81 82 int rib_add_default_route(uint32_t fibnum, int family, struct ifnet *ifp, 83 struct sockaddr *gw, struct rib_cmd_info *rc); 84 85 typedef void route_notification_t(const struct rib_cmd_info *rc, void *); 86 void rib_decompose_notification(const struct rib_cmd_info *rc, 87 route_notification_t *cb, void *cbdata); 88 89 int rib_add_redirect(u_int fibnum, struct sockaddr *dst, 90 struct sockaddr *gateway, struct sockaddr *author, struct ifnet *ifp, 91 int flags, int expire_sec); 92 93 /* common flags for the functions below */ 94 #define RIB_FLAG_WLOCK 0x01 /* Need exclusive rnh lock */ 95 #define RIB_FLAG_LOCKED 0x02 /* Do not explicitly acquire rnh lock */ 96 97 enum rib_walk_hook { 98 RIB_WALK_HOOK_PRE, /* Hook is called before iteration */ 99 RIB_WALK_HOOK_POST, /* Hook is called after iteration */ 100 }; 101 typedef int rib_walktree_f_t(struct rtentry *, void *); 102 typedef void rib_walk_hook_f_t(struct rib_head *rnh, enum rib_walk_hook stage, 103 void *arg); 104 void rib_walk(uint32_t fibnum, int af, bool wlock, rib_walktree_f_t *wa_f, 105 void *arg); 106 void rib_walk_ext(uint32_t fibnum, int af, bool wlock, rib_walktree_f_t *wa_f, 107 rib_walk_hook_f_t *hook_f, void *arg); 108 void rib_walk_ext_internal(struct rib_head *rnh, bool wlock, 109 rib_walktree_f_t *wa_f, rib_walk_hook_f_t *hook_f, void *arg); 110 void rib_walk_ext_locked(struct rib_head *rnh, rib_walktree_f_t *wa_f, 111 rib_walk_hook_f_t *hook_f, void *arg); 112 void rib_walk_from(uint32_t fibnum, int family, uint32_t flags, struct sockaddr *prefix, 113 struct sockaddr *mask, rib_walktree_f_t *wa_f, void *arg); 114 115 void rib_walk_del(u_int fibnum, int family, rib_filter_f_t *filter_f, 116 void *filter_arg, bool report); 117 118 void rib_foreach_table_walk(int family, bool wlock, rib_walktree_f_t *wa_f, 119 rib_walk_hook_f_t *hook_f, void *arg); 120 void rib_foreach_table_walk_del(int family, rib_filter_f_t *filter_f, void *arg); 121 122 struct nhop_object; 123 struct nhgrp_object; 124 struct ucred; 125 126 const struct rtentry * 127 rib_lookup_prefix_plen(struct rib_head *rnh, struct sockaddr *dst, int plen, 128 struct route_nhop_data *rnd); 129 130 /* rtentry accessors */ 131 bool rt_is_host(const struct rtentry *rt); 132 sa_family_t rt_get_family(const struct rtentry *); 133 struct nhop_object *rt_get_raw_nhop(const struct rtentry *rt); 134 void rt_get_rnd(const struct rtentry *rt, struct route_nhop_data *rnd); 135 bool rt_is_exportable(const struct rtentry *rt, struct ucred *cred); 136 #ifdef INET 137 struct in_addr; 138 void rt_get_inet_prefix_plen(const struct rtentry *rt, struct in_addr *paddr, 139 int *plen, uint32_t *pscopeid); 140 void rt_get_inet_prefix_pmask(const struct rtentry *rt, struct in_addr *paddr, 141 struct in_addr *pmask, uint32_t *pscopeid); 142 struct rtentry *rt_get_inet_parent(uint32_t fibnum, struct in_addr addr, int plen); 143 #endif 144 #ifdef INET6 145 struct in6_addr; 146 void rt_get_inet6_prefix_plen(const struct rtentry *rt, struct in6_addr *paddr, 147 int *plen, uint32_t *pscopeid); 148 void rt_get_inet6_prefix_pmask(const struct rtentry *rt, struct in6_addr *paddr, 149 struct in6_addr *pmask, uint32_t *pscopeid); 150 struct rtentry *rt_get_inet6_parent(uint32_t fibnum, const struct in6_addr *paddr, 151 int plen); 152 153 struct in6_addr; 154 void ip6_writemask(struct in6_addr *addr6, uint8_t mask); 155 #endif 156 157 /* Nexthops */ 158 uint32_t nhops_get_count(struct rib_head *rh); 159 160 struct nhop_priv; 161 struct nhop_iter { 162 uint32_t fibnum; 163 uint8_t family; 164 struct rib_head *rh; 165 int _i; 166 struct nhop_priv *_next; 167 }; 168 169 struct nhop_object *nhops_iter_start(struct nhop_iter *iter); 170 struct nhop_object *nhops_iter_next(struct nhop_iter *iter); 171 void nhops_iter_stop(struct nhop_iter *iter); 172 173 /* Multipath */ 174 struct weightened_nhop; 175 176 const struct weightened_nhop *nhgrp_get_nhops(const struct nhgrp_object *nhg, 177 uint32_t *pnum_nhops); 178 uint32_t nhgrp_get_count(struct rib_head *rh); 179 int nhgrp_get_group(struct rib_head *rh, struct weightened_nhop *wn, int num_nhops, 180 uint32_t uidx, struct nhgrp_object **pnhg); 181 182 /* Route subscriptions */ 183 enum rib_subscription_type { 184 RIB_NOTIFY_IMMEDIATE, 185 RIB_NOTIFY_DELAYED 186 }; 187 188 struct rib_subscription; 189 typedef void rib_subscription_cb_t(struct rib_head *rnh, struct rib_cmd_info *rc, 190 void *arg); 191 192 struct rib_subscription *rib_subscribe(uint32_t fibnum, int family, 193 rib_subscription_cb_t *f, void *arg, enum rib_subscription_type type, 194 bool waitok); 195 struct rib_subscription *rib_subscribe_internal(struct rib_head *rnh, 196 rib_subscription_cb_t *f, void *arg, enum rib_subscription_type type, 197 bool waitok); 198 struct rib_subscription *rib_subscribe_locked(struct rib_head *rnh, 199 rib_subscription_cb_t *f, void *arg, enum rib_subscription_type type); 200 void rib_unsubscribe(struct rib_subscription *rs); 201 void rib_unsubscribe_locked(struct rib_subscription *rs); 202 void rib_notify(struct rib_head *rnh, enum rib_subscription_type type, 203 struct rib_cmd_info *rc); 204 205 /* Event bridge */ 206 typedef void route_event_f(uint32_t fibnum, const struct rib_cmd_info *rc); 207 typedef void ifmsg_event_f(struct ifnet *ifp, int if_flags_mask); 208 struct rtbridge{ 209 route_event_f *route_f; 210 ifmsg_event_f *ifmsg_f; 211 }; 212 extern struct rtbridge *rtsock_callback_p; 213 extern struct rtbridge *netlink_callback_p; 214 #endif 215