1 /* $OpenBSD: if_var.h,v 1.132 2023/12/23 10:52:54 bluhm Exp $ */ 2 /* $NetBSD: if.h,v 1.23 1996/05/07 02:40:27 thorpej Exp $ */ 3 4 /* 5 * Copyright (c) 2012-2013 Henning Brauer <henning@openbsd.org> 6 * Copyright (c) 1982, 1986, 1989, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)if.h 8.1 (Berkeley) 6/10/93 34 */ 35 36 #ifndef _NET_IF_VAR_H_ 37 #define _NET_IF_VAR_H_ 38 39 #ifdef _KERNEL 40 41 #include <sys/queue.h> 42 #include <sys/mbuf.h> 43 #include <sys/srp.h> 44 #include <sys/refcnt.h> 45 #include <sys/task.h> 46 #include <sys/time.h> 47 #include <sys/timeout.h> 48 49 #include <net/ifq.h> 50 51 /* 52 * Structures defining a network interface, providing a packet 53 * transport mechanism (ala level 0 of the PUP protocols). 54 * 55 * Each interface accepts output datagrams of a specified maximum 56 * length, and provides higher level routines with input datagrams 57 * received from its medium. 58 * 59 * Output occurs when the routine if_output is called, with four parameters: 60 * (*ifp->if_output)(ifp, m, dst, rt) 61 * Here m is the mbuf chain to be sent and dst is the destination address. 62 * The output routine encapsulates the supplied datagram if necessary, 63 * and then transmits it on its medium. 64 * 65 * On input, each interface unwraps the data received by it, and either 66 * places it on the input queue of an internetwork datagram routine 67 * and posts the associated software interrupt, or passes the datagram to a raw 68 * packet input routine. 69 * 70 * Routines exist for locating interfaces by their addresses 71 * or for locating an interface on a certain network, as well as more general 72 * routing and gateway routines maintaining information used to locate 73 * interfaces. These routines live in the files if.c and route.c 74 */ 75 76 /* 77 * Locks used to protect struct members in this file: 78 * I immutable after creation 79 * d protection left to the driver 80 * c only used in ioctl or routing socket contexts (kernel lock) 81 * K kernel lock 82 * N net lock 83 * 84 * For SRP related structures that allow lock-free reads, the write lock 85 * is indicated below. 86 */ 87 88 struct rtentry; 89 struct ifnet; 90 struct task; 91 struct cpumem; 92 93 /* 94 * Structure describing a `cloning' interface. 95 */ 96 struct if_clone { 97 LIST_ENTRY(if_clone) ifc_list; /* [I] on list of cloners */ 98 const char *ifc_name; /* name of device, e.g. `gif' */ 99 size_t ifc_namelen; /* length of name */ 100 101 int (*ifc_create)(struct if_clone *, int); 102 int (*ifc_destroy)(struct ifnet *); 103 }; 104 105 #define IF_CLONE_INITIALIZER(name, create, destroy) \ 106 { \ 107 .ifc_list = { NULL, NULL }, \ 108 .ifc_name = name, \ 109 .ifc_namelen = sizeof(name) - 1, \ 110 .ifc_create = create, \ 111 .ifc_destroy = destroy, \ 112 } 113 114 /* 115 * Structure defining a queue for a network interface. 116 * 117 * (Would like to call this struct ``if'', but C isn't PL/1.) 118 */ 119 TAILQ_HEAD(ifnet_head, ifnet); /* the actual queue head */ 120 121 struct ifnet { /* and the entries */ 122 void *if_softc; /* [I] lower-level data for this if */ 123 struct refcnt if_refcnt; 124 TAILQ_ENTRY(ifnet) if_list; /* [NK] all struct ifnets are chained */ 125 TAILQ_HEAD(, ifaddr) if_addrlist; /* [N] list of addresses per if */ 126 TAILQ_HEAD(, ifmaddr) if_maddrlist; /* [N] list of multicast records */ 127 TAILQ_HEAD(, ifg_list) if_groups; /* [N] list of groups per if */ 128 struct task_list if_addrhooks; /* [I] address change callbacks */ 129 struct task_list if_linkstatehooks; /* [I] link change callbacks*/ 130 struct task_list if_detachhooks; /* [I] detach callbacks */ 131 /* [I] check or clean routes (+ or -)'d */ 132 void (*if_rtrequest)(struct ifnet *, int, struct rtentry *); 133 char if_xname[IFNAMSIZ]; /* [I] external name (name + unit) */ 134 int if_pcount; /* [N] # of promiscuous listeners */ 135 unsigned int if_bridgeidx; /* [K] used by bridge ports */ 136 caddr_t if_bpf; /* packet filter structure */ 137 caddr_t if_mcast; /* used by multicast code */ 138 caddr_t if_mcast6; /* used by IPv6 multicast code */ 139 caddr_t if_pf_kif; /* pf interface abstraction */ 140 union { 141 struct srpl carp_s; /* carp if list (used by !carp ifs) */ 142 unsigned int carp_idx; /* index of carpdev (used by carp 143 ifs) */ 144 } if_carp_ptr; 145 #define if_carp if_carp_ptr.carp_s 146 #define if_carpdevidx if_carp_ptr.carp_idx 147 unsigned int if_index; /* [I] unique index for this if */ 148 short if_timer; /* time 'til if_watchdog called */ 149 unsigned short if_flags; /* [N] up/down, broadcast, etc. */ 150 int if_xflags; /* [N] extra softnet flags */ 151 struct if_data if_data; /* stats and other data about if */ 152 struct cpumem *if_counters; /* per cpu stats */ 153 uint32_t if_hardmtu; /* [d] maximum MTU device supports */ 154 char if_description[IFDESCRSIZE]; /* [c] interface description */ 155 u_short if_rtlabelid; /* [c] next route label */ 156 uint8_t if_priority; /* [c] route priority offset */ 157 uint8_t if_llprio; /* [N] link layer priority */ 158 struct timeout if_slowtimo; /* [I] watchdog timeout */ 159 struct task if_watchdogtask; /* [I] watchdog task */ 160 struct task if_linkstatetask; /* [I] task to do route updates */ 161 162 /* procedure handles */ 163 void (*if_input)(struct ifnet *, struct mbuf *); 164 int (*if_bpf_mtap)(caddr_t, const struct mbuf *, u_int); 165 int (*if_output)(struct ifnet *, struct mbuf *, struct sockaddr *, 166 struct rtentry *); /* output routine (enqueue) */ 167 /* link level output function */ 168 int (*if_ll_output)(struct ifnet *, struct mbuf *, 169 struct sockaddr *, struct rtentry *); 170 int (*if_enqueue)(struct ifnet *, struct mbuf *); 171 void (*if_start)(struct ifnet *); /* initiate output */ 172 int (*if_ioctl)(struct ifnet *, u_long, caddr_t); /* ioctl hook */ 173 void (*if_watchdog)(struct ifnet *); /* timer routine */ 174 int (*if_wol)(struct ifnet *, int); /* WoL routine **/ 175 176 /* queues */ 177 struct ifqueue if_snd; /* transmit queue */ 178 struct ifqueue **if_ifqs; /* [I] pointer to an array of sndqs */ 179 void (*if_qstart)(struct ifqueue *); 180 unsigned int if_nifqs; /* [I] number of output queues */ 181 unsigned int if_txmit; /* [c] txmitigation amount */ 182 183 struct ifiqueue if_rcv; /* rx/input queue */ 184 struct ifiqueue **if_iqs; /* [I] pointer to the array of iqs */ 185 unsigned int if_niqs; /* [I] number of input queues */ 186 187 struct sockaddr_dl *if_sadl; /* [N] pointer to our sockaddr_dl */ 188 189 struct nd_ifinfo *if_nd; /* [I] IPv6 Neighbor Discovery info */ 190 }; 191 #define if_mtu if_data.ifi_mtu 192 #define if_type if_data.ifi_type 193 #define if_addrlen if_data.ifi_addrlen 194 #define if_hdrlen if_data.ifi_hdrlen 195 #define if_metric if_data.ifi_metric 196 #define if_link_state if_data.ifi_link_state 197 #define if_baudrate if_data.ifi_baudrate 198 #define if_ipackets if_data.ifi_ipackets 199 #define if_ierrors if_data.ifi_ierrors 200 #define if_opackets if_data.ifi_opackets 201 #define if_oerrors if_data.ifi_oerrors 202 #define if_collisions if_data.ifi_collisions 203 #define if_ibytes if_data.ifi_ibytes 204 #define if_obytes if_data.ifi_obytes 205 #define if_imcasts if_data.ifi_imcasts 206 #define if_omcasts if_data.ifi_omcasts 207 #define if_iqdrops if_data.ifi_iqdrops 208 #define if_oqdrops if_data.ifi_oqdrops 209 #define if_noproto if_data.ifi_noproto 210 #define if_lastchange if_data.ifi_lastchange /* [c] last op. state change */ 211 #define if_capabilities if_data.ifi_capabilities 212 #define if_rdomain if_data.ifi_rdomain 213 214 enum if_counters { 215 ifc_ipackets, /* packets received on interface */ 216 ifc_ierrors, /* input errors on interface */ 217 ifc_opackets, /* packets sent on interface */ 218 ifc_oerrors, /* output errors on interface */ 219 ifc_collisions, /* collisions on csma interfaces */ 220 ifc_ibytes, /* total number of octets received */ 221 ifc_obytes, /* total number of octets sent */ 222 ifc_imcasts, /* packets received via multicast */ 223 ifc_omcasts, /* packets sent via multicast */ 224 ifc_iqdrops, /* dropped on input, this interface */ 225 ifc_oqdrops, /* dropped on output, this interface */ 226 ifc_noproto, /* destined for unsupported protocol */ 227 228 ifc_ncounters 229 }; 230 231 /* 232 * The ifaddr structure contains information about one address 233 * of an interface. They are maintained by the different address families, 234 * are allocated and attached when an address is set, and are linked 235 * together so all addresses for an interface can be located. 236 */ 237 struct ifaddr { 238 struct sockaddr *ifa_addr; /* address of interface */ 239 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 240 #define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 241 struct sockaddr *ifa_netmask; /* used to determine subnet */ 242 struct ifnet *ifa_ifp; /* back-pointer to interface */ 243 TAILQ_ENTRY(ifaddr) ifa_list; /* [N] list of addresses for 244 interface */ 245 u_int ifa_flags; /* interface flags, see below */ 246 struct refcnt ifa_refcnt; /* number of `rt_ifa` references */ 247 int ifa_metric; /* cost of going out this interface */ 248 }; 249 250 #define IFA_ROUTE 0x01 /* Auto-magically installed route */ 251 252 /* 253 * Interface multicast address. 254 */ 255 struct ifmaddr { 256 struct sockaddr *ifma_addr; /* Protocol address */ 257 unsigned int ifma_ifidx; /* Index of the interface */ 258 struct refcnt ifma_refcnt; /* Count of references */ 259 TAILQ_ENTRY(ifmaddr) ifma_list; /* Per-interface list */ 260 }; 261 262 /* 263 * interface groups 264 */ 265 266 struct ifg_group { 267 char ifg_group[IFNAMSIZ]; /* [I] group name */ 268 u_int ifg_refcnt; /* [N] group reference count */ 269 caddr_t ifg_pf_kif; /* [I] pf interface group */ 270 int ifg_carp_demoted; /* [K] carp demotion counter */ 271 TAILQ_HEAD(, ifg_member) ifg_members; /* [N] list of members per group */ 272 TAILQ_ENTRY(ifg_group) ifg_next; /* [N] all groups are chained */ 273 }; 274 275 struct ifg_member { 276 TAILQ_ENTRY(ifg_member) ifgm_next; /* [N] all members are chained */ 277 struct ifnet *ifgm_ifp; /* [I] member interface */ 278 }; 279 280 struct ifg_list { 281 struct ifg_group *ifgl_group; /* [I] interface group */ 282 TAILQ_ENTRY(ifg_list) ifgl_next; /* [N] all groups are chained */ 283 }; 284 285 #define IFNET_SLOWTIMO 1 /* granularity is 1 second */ 286 287 #define IF_TXMIT_MIN 1 288 #define IF_TXMIT_DEFAULT 16 289 290 /* default interface priorities */ 291 #define IF_WIRED_DEFAULT_PRIORITY 0 292 #define IF_WIRELESS_DEFAULT_PRIORITY 4 293 #define IF_WWAN_DEFAULT_PRIORITY 6 294 #define IF_CARP_DEFAULT_PRIORITY 15 295 296 /* 297 * Network stack input queues. 298 */ 299 struct niqueue { 300 struct mbuf_queue ni_q; 301 u_int ni_isr; 302 }; 303 304 #define NIQUEUE_INITIALIZER(_len, _isr) \ 305 { MBUF_QUEUE_INITIALIZER((_len), IPL_NET), (_isr) } 306 307 void niq_init(struct niqueue *, u_int, u_int); 308 int niq_enqueue(struct niqueue *, struct mbuf *); 309 int niq_enlist(struct niqueue *, struct mbuf_list *); 310 311 #define niq_dequeue(_q) mq_dequeue(&(_q)->ni_q) 312 #define niq_dechain(_q) mq_dechain(&(_q)->ni_q) 313 #define niq_delist(_q, _ml) mq_delist(&(_q)->ni_q, (_ml)) 314 #define niq_len(_q) mq_len(&(_q)->ni_q) 315 #define niq_drops(_q) mq_drops(&(_q)->ni_q) 316 #define sysctl_niq(_n, _l, _op, _olp, _np, _nl, _niq) \ 317 sysctl_mq((_n), (_l), (_op), (_olp), (_np), (_nl), &(_niq)->ni_q) 318 319 extern struct ifnet_head ifnetlist; 320 321 void if_start(struct ifnet *); 322 int if_enqueue(struct ifnet *, struct mbuf *); 323 int if_enqueue_ifq(struct ifnet *, struct mbuf *); 324 void if_input(struct ifnet *, struct mbuf_list *); 325 void if_vinput(struct ifnet *, struct mbuf *); 326 void if_input_process(struct ifnet *, struct mbuf_list *); 327 int if_input_local(struct ifnet *, struct mbuf *, sa_family_t); 328 int if_output_ml(struct ifnet *, struct mbuf_list *, 329 struct sockaddr *, struct rtentry *); 330 int if_output_mq(struct ifnet *, struct mbuf_queue *, unsigned int *, 331 struct sockaddr *, struct rtentry *); 332 int if_output_tso(struct ifnet *, struct mbuf **, struct sockaddr *, 333 struct rtentry *, u_int); 334 int if_output_local(struct ifnet *, struct mbuf *, sa_family_t); 335 void if_rtrequest_dummy(struct ifnet *, int, struct rtentry *); 336 void p2p_rtrequest(struct ifnet *, int, struct rtentry *); 337 void p2p_input(struct ifnet *, struct mbuf *); 338 int p2p_bpf_mtap(caddr_t, const struct mbuf *, u_int); 339 340 struct ifaddr *ifa_ifwithaddr(const struct sockaddr *, u_int); 341 struct ifaddr *ifa_ifwithdstaddr(const struct sockaddr *, u_int); 342 struct ifaddr *ifaof_ifpforaddr(const struct sockaddr *, struct ifnet *); 343 struct ifaddr *ifaref(struct ifaddr *); 344 void ifafree(struct ifaddr *); 345 346 int if_isconnected(const struct ifnet *, unsigned int); 347 348 void if_clone_attach(struct if_clone *); 349 350 int if_clone_create(const char *, int); 351 int if_clone_destroy(const char *); 352 353 struct if_clone * 354 if_clone_lookup(const char *, int *); 355 356 void ifa_add(struct ifnet *, struct ifaddr *); 357 void ifa_del(struct ifnet *, struct ifaddr *); 358 void ifa_update_broadaddr(struct ifnet *, struct ifaddr *, 359 struct sockaddr *); 360 361 void if_addrhook_add(struct ifnet *, struct task *); 362 void if_addrhook_del(struct ifnet *, struct task *); 363 void if_addrhooks_run(struct ifnet *); 364 void if_linkstatehook_add(struct ifnet *, struct task *); 365 void if_linkstatehook_del(struct ifnet *, struct task *); 366 void if_detachhook_add(struct ifnet *, struct task *); 367 void if_detachhook_del(struct ifnet *, struct task *); 368 369 void if_rxr_livelocked(struct if_rxring *); 370 void if_rxr_init(struct if_rxring *, u_int, u_int); 371 u_int if_rxr_get(struct if_rxring *, u_int); 372 373 #define if_rxr_put(_r, _c) do { (_r)->rxr_alive -= (_c); } while (0) 374 #define if_rxr_needrefill(_r) ((_r)->rxr_alive < (_r)->rxr_lwm) 375 #define if_rxr_inuse(_r) ((_r)->rxr_alive) 376 #define if_rxr_cwm(_r) ((_r)->rxr_cwm) 377 378 int if_rxr_info_ioctl(struct if_rxrinfo *, u_int, struct if_rxring_info *); 379 int if_rxr_ioctl(struct if_rxrinfo *, const char *, u_int, 380 struct if_rxring *); 381 382 void if_counters_alloc(struct ifnet *); 383 void if_counters_free(struct ifnet *); 384 385 int if_txhprio_l2_check(int); 386 int if_txhprio_l3_check(int); 387 int if_rxhprio_l2_check(int); 388 int if_rxhprio_l3_check(int); 389 390 #endif /* _KERNEL */ 391 392 #endif /* _NET_IF_VAR_H_ */ 393