ifq.h revision 85074
1/* 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. 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 * From: @(#)if.h 8.1 (Berkeley) 6/10/93 34 * $FreeBSD: head/sys/net/if_var.h 85074 2001-10-17 18:07:05Z ru $ 35 */ 36 37#ifndef _NET_IF_VAR_H_ 38#define _NET_IF_VAR_H_ 39 40/* 41 * Structures defining a network interface, providing a packet 42 * transport mechanism (ala level 0 of the PUP protocols). 43 * 44 * Each interface accepts output datagrams of a specified maximum 45 * length, and provides higher level routines with input datagrams 46 * received from its medium. 47 * 48 * Output occurs when the routine if_output is called, with three parameters: 49 * (*ifp->if_output)(ifp, m, dst, rt) 50 * Here m is the mbuf chain to be sent and dst is the destination address. 51 * The output routine encapsulates the supplied datagram if necessary, 52 * and then transmits it on its medium. 53 * 54 * On input, each interface unwraps the data received by it, and either 55 * places it on the input queue of a internetwork datagram routine 56 * and posts the associated software interrupt, or passes the datagram to a raw 57 * packet input routine. 58 * 59 * Routines exist for locating interfaces by their addresses 60 * or for locating a interface on a certain network, as well as more general 61 * routing and gateway routines maintaining information used to locate 62 * interfaces. These routines live in the files if.c and route.c 63 */ 64 65#ifdef __STDC__ 66/* 67 * Forward structure declarations for function prototypes [sic]. 68 */ 69struct mbuf; 70struct thread; 71struct rtentry; 72struct rt_addrinfo; 73struct socket; 74struct ether_header; 75#endif 76 77#include <sys/queue.h> /* get TAILQ macros */ 78 79#ifdef _KERNEL 80#include <sys/mbuf.h> 81#include <sys/systm.h> /* XXX */ 82#endif /* _KERNEL */ 83#include <sys/lock.h> /* XXX */ 84#include <sys/mutex.h> /* XXX */ 85#include <sys/event.h> /* XXX */ 86 87TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */ 88TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */ 89TAILQ_HEAD(ifprefixhead, ifprefix); 90TAILQ_HEAD(ifmultihead, ifmultiaddr); 91 92/* 93 * Structure defining a queue for a network interface. 94 */ 95struct ifqueue { 96 struct mbuf *ifq_head; 97 struct mbuf *ifq_tail; 98 int ifq_len; 99 int ifq_maxlen; 100 int ifq_drops; 101 struct mtx ifq_mtx; 102}; 103 104/* 105 * Structure defining a network interface. 106 * 107 * (Would like to call this struct ``if'', but C isn't PL/1.) 108 */ 109 110/* 111 * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with 112 * one of these structures, typically held within an arpcom structure. 113 */ 114struct ifnet { 115 void *if_softc; /* pointer to driver state */ 116 char *if_name; /* name, e.g. ``en'' or ``lo'' */ 117 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */ 118 struct ifaddrhead if_addrhead; /* linked list of addresses per if */ 119 struct klist if_klist; /* events attached to this if */ 120 int if_pcount; /* number of promiscuous listeners */ 121 struct bpf_if *if_bpf; /* packet filter structure */ 122 u_short if_index; /* numeric abbreviation for this if */ 123 short if_unit; /* sub-unit for lower level driver */ 124 short if_timer; /* time 'til if_watchdog called */ 125 short if_flags; /* up/down, broadcast, etc. */ 126 int if_capabilities; /* interface capabilities */ 127 int if_capenable; /* enabled features */ 128 int if_mpsafe; /* XXX TEMPORARY */ 129 int if_ipending; /* interrupts pending */ 130 void *if_linkmib; /* link-type-specific MIB data */ 131 size_t if_linkmiblen; /* length of above data */ 132 struct if_data if_data; 133 struct ifmultihead if_multiaddrs; /* multicast addresses configured */ 134 int if_amcount; /* number of all-multicast requests */ 135/* procedure handles */ 136 int (*if_output) /* output routine (enqueue) */ 137 __P((struct ifnet *, struct mbuf *, struct sockaddr *, 138 struct rtentry *)); 139 void (*if_start) /* initiate output routine */ 140 __P((struct ifnet *)); 141 int (*if_done) /* output complete routine */ 142 __P((struct ifnet *)); /* (XXX not used; fake prototype) */ 143 int (*if_ioctl) /* ioctl routine */ 144 __P((struct ifnet *, u_long, caddr_t)); 145 void (*if_watchdog) /* timer routine */ 146 __P((struct ifnet *)); 147 int (*if_poll_recv) /* polled receive routine */ 148 __P((struct ifnet *, int *)); 149 int (*if_poll_xmit) /* polled transmit routine */ 150 __P((struct ifnet *, int *)); 151 void (*if_poll_intren) /* polled interrupt reenable routine */ 152 __P((struct ifnet *)); 153 void (*if_poll_slowinput) /* input routine for slow devices */ 154 __P((struct ifnet *, struct mbuf *)); 155 void (*if_init) /* Init routine */ 156 __P((void *)); 157 int (*if_resolvemulti) /* validate/resolve multicast */ 158 __P((struct ifnet *, struct sockaddr **, struct sockaddr *)); 159 struct ifqueue if_snd; /* output queue */ 160 struct ifqueue *if_poll_slowq; /* input queue for slow devices */ 161 struct ifprefixhead if_prefixhead; /* list of prefixes per if */ 162 u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */ 163}; 164 165typedef void if_init_f_t __P((void *)); 166 167#define if_mtu if_data.ifi_mtu 168#define if_type if_data.ifi_type 169#define if_physical if_data.ifi_physical 170#define if_addrlen if_data.ifi_addrlen 171#define if_hdrlen if_data.ifi_hdrlen 172#define if_metric if_data.ifi_metric 173#define if_baudrate if_data.ifi_baudrate 174#define if_hwassist if_data.ifi_hwassist 175#define if_ipackets if_data.ifi_ipackets 176#define if_ierrors if_data.ifi_ierrors 177#define if_opackets if_data.ifi_opackets 178#define if_oerrors if_data.ifi_oerrors 179#define if_collisions if_data.ifi_collisions 180#define if_ibytes if_data.ifi_ibytes 181#define if_obytes if_data.ifi_obytes 182#define if_imcasts if_data.ifi_imcasts 183#define if_omcasts if_data.ifi_omcasts 184#define if_iqdrops if_data.ifi_iqdrops 185#define if_noproto if_data.ifi_noproto 186#define if_lastchange if_data.ifi_lastchange 187#define if_recvquota if_data.ifi_recvquota 188#define if_xmitquota if_data.ifi_xmitquota 189#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0) 190 191/* for compatibility with other BSDs */ 192#define if_addrlist if_addrhead 193#define if_list if_link 194 195/* 196 * Bit values in if_ipending 197 */ 198#define IFI_RECV 1 /* I want to receive */ 199#define IFI_XMIT 2 /* I want to transmit */ 200 201/* 202 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq) 203 * are queues of messages stored on ifqueue structures 204 * (defined above). Entries are added to and deleted from these structures 205 * by these macros, which should be called with ipl raised to splimp(). 206 */ 207#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx) 208#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx) 209#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 210#define _IF_DROP(ifq) ((ifq)->ifq_drops++) 211#define _IF_QLEN(ifq) ((ifq)->ifq_len) 212 213#define _IF_ENQUEUE(ifq, m) do { \ 214 (m)->m_nextpkt = NULL; \ 215 if ((ifq)->ifq_tail == NULL) \ 216 (ifq)->ifq_head = m; \ 217 else \ 218 (ifq)->ifq_tail->m_nextpkt = m; \ 219 (ifq)->ifq_tail = m; \ 220 (ifq)->ifq_len++; \ 221} while (0) 222 223#define IF_ENQUEUE(ifq, m) do { \ 224 IF_LOCK(ifq); \ 225 _IF_ENQUEUE(ifq, m); \ 226 IF_UNLOCK(ifq); \ 227} while (0) 228 229#define _IF_PREPEND(ifq, m) do { \ 230 (m)->m_nextpkt = (ifq)->ifq_head; \ 231 if ((ifq)->ifq_tail == NULL) \ 232 (ifq)->ifq_tail = (m); \ 233 (ifq)->ifq_head = (m); \ 234 (ifq)->ifq_len++; \ 235} while (0) 236 237#define IF_PREPEND(ifq, m) do { \ 238 IF_LOCK(ifq); \ 239 _IF_PREPEND(ifq, m); \ 240 IF_UNLOCK(ifq); \ 241} while (0) 242 243#define _IF_DEQUEUE(ifq, m) do { \ 244 (m) = (ifq)->ifq_head; \ 245 if (m) { \ 246 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \ 247 (ifq)->ifq_tail = NULL; \ 248 (m)->m_nextpkt = NULL; \ 249 (ifq)->ifq_len--; \ 250 } \ 251} while (0) 252 253#define IF_DEQUEUE(ifq, m) do { \ 254 IF_LOCK(ifq); \ 255 _IF_DEQUEUE(ifq, m); \ 256 IF_UNLOCK(ifq); \ 257} while (0) 258 259#define IF_DRAIN(ifq) do { \ 260 struct mbuf *m; \ 261 IF_LOCK(ifq); \ 262 for (;;) { \ 263 _IF_DEQUEUE(ifq, m); \ 264 if (m == NULL) \ 265 break; \ 266 m_freem(m); \ 267 } \ 268 IF_UNLOCK(ifq); \ 269} while (0) 270 271#ifdef _KERNEL 272#define IF_HANDOFF(ifq, m, ifp) if_handoff(ifq, m, ifp, 0) 273#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) if_handoff(ifq, m, ifp, adj) 274 275static __inline int 276if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 277{ 278 int active = 0; 279 280 IF_LOCK(ifq); 281 if (_IF_QFULL(ifq)) { 282 _IF_DROP(ifq); 283 IF_UNLOCK(ifq); 284 m_freem(m); 285 return (0); 286 } 287 if (ifp != NULL) { 288 ifp->if_obytes += m->m_pkthdr.len + adjust; 289 if (m->m_flags & M_MCAST) 290 ifp->if_omcasts++; 291 active = ifp->if_flags & IFF_OACTIVE; 292 } 293 _IF_ENQUEUE(ifq, m); 294 IF_UNLOCK(ifq); 295 if (ifp != NULL && !active) { 296 if (ifp->if_mpsafe) { 297 DROP_GIANT_NOSWITCH(); 298 (*ifp->if_start)(ifp); 299 PICKUP_GIANT(); 300 } else { 301 (*ifp->if_start)(ifp); 302 } 303 } 304 return (1); 305} 306 307/* 308 * 72 was chosen below because it is the size of a TCP/IP 309 * header (40) + the minimum mss (32). 310 */ 311#define IF_MINMTU 72 312#define IF_MAXMTU 65535 313 314#endif /* _KERNEL */ 315 316/* 317 * The ifaddr structure contains information about one address 318 * of an interface. They are maintained by the different address families, 319 * are allocated and attached when an address is set, and are linked 320 * together so all addresses for an interface can be located. 321 */ 322struct ifaddr { 323 struct sockaddr *ifa_addr; /* address of interface */ 324 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 325#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 326 struct sockaddr *ifa_netmask; /* used to determine subnet */ 327 struct if_data if_data; /* not all members are meaningful */ 328 struct ifnet *ifa_ifp; /* back-pointer to interface */ 329 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */ 330 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */ 331 __P((int, struct rtentry *, struct rt_addrinfo *)); 332 u_short ifa_flags; /* mostly rt_flags for cloning */ 333 u_int ifa_refcnt; /* references to this structure */ 334 int ifa_metric; /* cost of going out this interface */ 335#ifdef notdef 336 struct rtentry *ifa_rt; /* XXXX for ROUTETOIF ????? */ 337#endif 338 int (*ifa_claim_addr) /* check if an addr goes to this if */ 339 __P((struct ifaddr *, struct sockaddr *)); 340 341}; 342#define IFA_ROUTE RTF_UP /* route installed */ 343 344/* for compatibility with other BSDs */ 345#define ifa_list ifa_link 346 347/* 348 * The prefix structure contains information about one prefix 349 * of an interface. They are maintained by the different address families, 350 * are allocated and attached when an prefix or an address is set, 351 * and are linked together so all prefixes for an interface can be located. 352 */ 353struct ifprefix { 354 struct sockaddr *ifpr_prefix; /* prefix of interface */ 355 struct ifnet *ifpr_ifp; /* back-pointer to interface */ 356 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */ 357 u_char ifpr_plen; /* prefix length in bits */ 358 u_char ifpr_type; /* protocol dependent prefix type */ 359}; 360 361/* 362 * Multicast address structure. This is analogous to the ifaddr 363 * structure except that it keeps track of multicast addresses. 364 * Also, the reference count here is a count of requests for this 365 * address, not a count of pointers to this structure. 366 */ 367struct ifmultiaddr { 368 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */ 369 struct sockaddr *ifma_addr; /* address this membership is for */ 370 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */ 371 struct ifnet *ifma_ifp; /* back-pointer to interface */ 372 u_int ifma_refcount; /* reference count */ 373 void *ifma_protospec; /* protocol-specific state, if any */ 374}; 375 376#ifdef _KERNEL 377#define IFAFREE(ifa) \ 378 do { \ 379 if ((ifa)->ifa_refcnt <= 0) \ 380 ifafree(ifa); \ 381 else \ 382 (ifa)->ifa_refcnt--; \ 383 } while (0) 384 385struct ifindex_entry { 386 struct ifnet *ife_ifnet; 387 struct ifaddr *ife_ifnet_addr; 388 dev_t ife_dev; 389}; 390 391#define ifnet_byindex(idx) ifindex_table[(idx)].ife_ifnet 392#define ifaddr_byindex(idx) ifindex_table[(idx)].ife_ifnet_addr 393#define ifdev_byindex(idx) ifindex_table[(idx)].ife_dev 394 395extern struct ifnethead ifnet; 396extern struct ifindex_entry *ifindex_table; 397extern int ifqmaxlen; 398extern struct ifnet *loif; /* first loopback interface */ 399extern int if_index; 400 401void ether_ifattach __P((struct ifnet *, int)); 402void ether_ifdetach __P((struct ifnet *, int)); 403void ether_input __P((struct ifnet *, struct ether_header *, struct mbuf *)); 404void ether_demux __P((struct ifnet *, struct ether_header *, struct mbuf *)); 405int ether_output __P((struct ifnet *, 406 struct mbuf *, struct sockaddr *, struct rtentry *)); 407int ether_output_frame __P((struct ifnet *, struct mbuf *)); 408int ether_ioctl __P((struct ifnet *, int, caddr_t)); 409 410int if_addmulti __P((struct ifnet *, struct sockaddr *, 411 struct ifmultiaddr **)); 412int if_allmulti __P((struct ifnet *, int)); 413void if_attach __P((struct ifnet *)); 414int if_delmulti __P((struct ifnet *, struct sockaddr *)); 415void if_detach __P((struct ifnet *)); 416void if_down __P((struct ifnet *)); 417void if_route __P((struct ifnet *, int flag, int fam)); 418int if_setlladdr __P((struct ifnet *, const u_char *, int)); 419void if_unroute __P((struct ifnet *, int flag, int fam)); 420void if_up __P((struct ifnet *)); 421/*void ifinit __P((void));*/ /* declared in systm.h for main() */ 422int ifioctl __P((struct socket *, u_long, caddr_t, struct thread *)); 423int ifpromisc __P((struct ifnet *, int)); 424struct ifnet *ifunit __P((const char *)); 425struct ifnet *if_withname __P((struct sockaddr *)); 426 427int if_poll_recv_slow __P((struct ifnet *ifp, int *quotap)); 428void if_poll_xmit_slow __P((struct ifnet *ifp, int *quotap)); 429void if_poll_throttle __P((void)); 430void if_poll_unthrottle __P((void *)); 431void if_poll_init __P((void)); 432void if_poll __P((void)); 433 434struct ifaddr *ifa_ifwithaddr __P((struct sockaddr *)); 435struct ifaddr *ifa_ifwithdstaddr __P((struct sockaddr *)); 436struct ifaddr *ifa_ifwithnet __P((struct sockaddr *)); 437struct ifaddr *ifa_ifwithroute __P((int, struct sockaddr *, 438 struct sockaddr *)); 439struct ifaddr *ifaof_ifpforaddr __P((struct sockaddr *, struct ifnet *)); 440void ifafree __P((struct ifaddr *)); 441 442struct ifmultiaddr *ifmaof_ifpforaddr __P((struct sockaddr *, 443 struct ifnet *)); 444int if_simloop __P((struct ifnet *ifp, struct mbuf *m, int af, int hlen)); 445 446void if_clone_attach __P((struct if_clone *)); 447void if_clone_detach __P((struct if_clone *)); 448 449int if_clone_create __P((char *, int)); 450int if_clone_destroy __P((const char *)); 451 452#define IF_LLADDR(ifp) \ 453 LLADDR((struct sockaddr_dl *) ifaddr_byindex((ifp)->if_index)->ifa_addr) 454 455#endif /* _KERNEL */ 456 457#endif /* !_NET_IF_VAR_H_ */ 458