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 * $Id: if.h,v 1.41 1996/12/13 21:28:37 wollman Exp $ 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 */ 69 struct mbuf; 70 struct proc; 71 struct rtentry; 72 struct socket; 73 struct ether_header; 74 #endif 75 76 #include <sys/queue.h> /* get TAILQ macros */ 77 78 TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */ 79 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */ 80 81 /* 82 * Structure defining a queue for a network interface. 83 */ 84 struct ifqueue { 85 struct mbuf *ifq_head; 86 struct mbuf *ifq_tail; 87 int ifq_len; 88 int ifq_maxlen; 89 int ifq_drops; 90 }; 91 92 /* 93 * Structure defining a network interface. 94 * 95 * (Would like to call this struct ``if'', but C isn't PL/1.) 96 */ 97 struct ifnet { 98 void *if_softc; /* pointer to driver state */ 99 char *if_name; /* name, e.g. ``en'' or ``lo'' */ 100 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */ 101 struct ifaddrhead if_addrhead; /* linked list of addresses per if */ 102 int if_pcount; /* number of promiscuous listeners */ 103 struct bpf_if *if_bpf; /* packet filter structure */ 104 u_short if_index; /* numeric abbreviation for this if */ 105 short if_unit; /* sub-unit for lower level driver */ 106 short if_timer; /* time 'til if_watchdog called */ 107 short if_flags; /* up/down, broadcast, etc. */ 108 int if_ipending; /* interrupts pending */ 109 void *if_linkmib; /* link-type-specific MIB data */ 110 size_t if_linkmiblen; /* length of above data */ 111 struct if_data if_data; 112 /* procedure handles */ 113 int (*if_output) /* output routine (enqueue) */ 114 __P((struct ifnet *, struct mbuf *, struct sockaddr *, 115 struct rtentry *)); 116 void (*if_start) /* initiate output routine */ 117 __P((struct ifnet *)); 118 int (*if_done) /* output complete routine */ 119 __P((struct ifnet *)); /* (XXX not used; fake prototype) */ 120 int (*if_ioctl) /* ioctl routine */ 121 __P((struct ifnet *, int, caddr_t)); 122 void (*if_watchdog) /* timer routine */ 123 __P((struct ifnet *)); 124 int (*if_poll_recv) /* polled receive routine */ 125 __P((struct ifnet *, int *)); 126 int (*if_poll_xmit) /* polled transmit routine */ 127 __P((struct ifnet *, int *)); 128 void (*if_poll_intren) /* polled interrupt reenable routine */ 129 __P((struct ifnet *)); 130 void (*if_poll_slowinput) /* input routine for slow devices */ 131 __P((struct ifnet *, struct mbuf *)); 132 void (*if_init) /* Init routine */ 133 __P((void *)); 134 struct ifqueue if_snd; /* output queue */ 135 struct ifqueue *if_poll_slowq; /* input queue for slow devices */ 136 }; 137 typedef void if_init_f_t __P((void *)); 138 139 #define if_mtu if_data.ifi_mtu 140 #define if_type if_data.ifi_type 141 #define if_physical if_data.ifi_physical 142 #define if_addrlen if_data.ifi_addrlen 143 #define if_hdrlen if_data.ifi_hdrlen 144 #define if_metric if_data.ifi_metric 145 #define if_baudrate if_data.ifi_baudrate 146 #define if_ipackets if_data.ifi_ipackets 147 #define if_ierrors if_data.ifi_ierrors 148 #define if_opackets if_data.ifi_opackets 149 #define if_oerrors if_data.ifi_oerrors 150 #define if_collisions if_data.ifi_collisions 151 #define if_ibytes if_data.ifi_ibytes 152 #define if_obytes if_data.ifi_obytes 153 #define if_imcasts if_data.ifi_imcasts 154 #define if_omcasts if_data.ifi_omcasts 155 #define if_iqdrops if_data.ifi_iqdrops 156 #define if_noproto if_data.ifi_noproto 157 #define if_lastchange if_data.ifi_lastchange 158 #define if_recvquota if_data.ifi_recvquota 159 #define if_xmitquota if_data.ifi_xmitquota 160 #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0) 161 162 /* 163 * Bit values in if_ipending 164 */ 165 #define IFI_RECV 1 /* I want to receive */ 166 #define IFI_XMIT 2 /* I want to transmit */ 167 168 /* 169 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq) 170 * are queues of messages stored on ifqueue structures 171 * (defined above). Entries are added to and deleted from these structures 172 * by these macros, which should be called with ipl raised to splimp(). 173 */ 174 #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 175 #define IF_DROP(ifq) ((ifq)->ifq_drops++) 176 #define IF_ENQUEUE(ifq, m) { \ 177 (m)->m_nextpkt = 0; \ 178 if ((ifq)->ifq_tail == 0) \ 179 (ifq)->ifq_head = m; \ 180 else \ 181 (ifq)->ifq_tail->m_nextpkt = m; \ 182 (ifq)->ifq_tail = m; \ 183 (ifq)->ifq_len++; \ 184 } 185 #define IF_PREPEND(ifq, m) { \ 186 (m)->m_nextpkt = (ifq)->ifq_head; \ 187 if ((ifq)->ifq_tail == 0) \ 188 (ifq)->ifq_tail = (m); \ 189 (ifq)->ifq_head = (m); \ 190 (ifq)->ifq_len++; \ 191 } 192 #define IF_DEQUEUE(ifq, m) { \ 193 (m) = (ifq)->ifq_head; \ 194 if (m) { \ 195 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \ 196 (ifq)->ifq_tail = 0; \ 197 (m)->m_nextpkt = 0; \ 198 (ifq)->ifq_len--; \ 199 } \ 200 } 201 202 #ifdef KERNEL 203 #define IF_ENQ_DROP(ifq, m) if_enq_drop(ifq, m) 204 205 #if defined(__GNUC__) && defined(MT_HEADER) 206 static inline int 207 if_queue_drop(struct ifqueue *ifq, struct mbuf *m) 208 { 209 IF_DROP(ifq); 210 return 0; 211 } 212 213 static inline int 214 if_enq_drop(struct ifqueue *ifq, struct mbuf *m) 215 { 216 if (IF_QFULL(ifq) && 217 !if_queue_drop(ifq, m)) 218 return 0; 219 IF_ENQUEUE(ifq, m); 220 return 1; 221 } 222 #else 223 224 #ifdef MT_HEADER 225 int if_enq_drop __P((struct ifqueue *, struct mbuf *)); 226 #endif 227 228 #endif 229 #endif /* KERNEL */ 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_link; /* queue macro glue */ 244 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */ 245 __P((int, struct rtentry *, struct sockaddr *)); 246 u_short ifa_flags; /* mostly rt_flags for cloning */ 247 short ifa_refcnt; /* references to this structure */ 248 int ifa_metric; /* cost of going out this interface */ 249 #ifdef notdef 250 struct rtentry *ifa_rt; /* XXXX for ROUTETOIF ????? */ 251 #endif 252 }; 253 #define IFA_ROUTE RTF_UP /* route installed */ 254 255 #ifdef KERNEL 256 #define IFAFREE(ifa) \ 257 if ((ifa)->ifa_refcnt <= 0) \ 258 ifafree(ifa); \ 259 else \ 260 (ifa)->ifa_refcnt--; 261 262 extern struct ifnethead ifnet; 263 extern int ifqmaxlen; 264 extern struct ifnet loif[]; 265 extern int if_index; 266 extern struct ifaddr **ifnet_addrs; 267 268 void ether_ifattach __P((struct ifnet *)); 269 void ether_input __P((struct ifnet *, struct ether_header *, struct mbuf *)); 270 int ether_output __P((struct ifnet *, 271 struct mbuf *, struct sockaddr *, struct rtentry *)); 272 int ether_ioctl __P((struct ifnet *, int, caddr_t)); 273 274 void if_attach __P((struct ifnet *)); 275 void if_down __P((struct ifnet *)); 276 void if_up __P((struct ifnet *)); 277 #ifdef vax 278 void ifubareset __P((int)); 279 #endif 280 /*void ifinit __P((void));*/ /* declared in systm.h for main() */ 281 int ifioctl __P((struct socket *, int, caddr_t, struct proc *)); 282 int ifpromisc __P((struct ifnet *, int)); 283 struct ifnet *ifunit __P((char *)); 284 285 int if_poll_recv_slow __P((struct ifnet *ifp, int *quotap)); 286 void if_poll_xmit_slow __P((struct ifnet *ifp, int *quotap)); 287 void if_poll_throttle __P((void)); 288 void if_poll_unthrottle __P((void *)); 289 void if_poll_init __P((void)); 290 void if_poll __P((void)); 291 292 struct ifaddr *ifa_ifwithaddr __P((struct sockaddr *)); 293 struct ifaddr *ifa_ifwithdstaddr __P((struct sockaddr *)); 294 struct ifaddr *ifa_ifwithnet __P((struct sockaddr *)); 295 struct ifaddr *ifa_ifwithroute __P((int, struct sockaddr *, 296 struct sockaddr *)); 297 struct ifaddr *ifaof_ifpforaddr __P((struct sockaddr *, struct ifnet *)); 298 void ifafree __P((struct ifaddr *)); 299 300 int looutput __P((struct ifnet *, 301 struct mbuf *, struct sockaddr *, struct rtentry *)); 302 #endif /* KERNEL */ 303 304 305 #endif /* !_NET_IF_VAR_H_ */ 306