1 /* 2 * Copyright (c) 1982, 1986, 1989 Regents of the University of California. 3 * 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 7.11 (Berkeley) 3/19/91 34 * $Id: if.h,v 1.3 1993/05/20 03:05:56 cgd Exp $ 35 */ 36 37 #ifndef _NET_IF_H_ 38 #define _NET_IF_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) 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 #ifndef _TIME_ /* XXX fast fix for SNMP, going away soon */ 65 #ifdef KERNEL 66 #include "../sys/time.h" 67 #else 68 #include <sys/time.h> 69 #endif 70 #endif 71 72 /* 73 * Structure defining a queue for a network interface. 74 * 75 * (Would like to call this struct ``if'', but C isn't PL/1.) 76 */ 77 78 struct ifnet { 79 char *if_name; /* name, e.g. ``en'' or ``lo'' */ 80 short if_unit; /* sub-unit for lower level driver */ 81 short if_mtu; /* maximum transmission unit */ 82 short if_flags; /* up/down, broadcast, etc. */ 83 short if_timer; /* time 'til if_watchdog called */ 84 int if_metric; /* routing metric (external only) */ 85 struct ifaddr *if_addrlist; /* linked list of addresses per if */ 86 struct ifqueue { 87 struct mbuf *ifq_head; 88 struct mbuf *ifq_tail; 89 int ifq_len; 90 int ifq_maxlen; 91 int ifq_drops; 92 } if_snd; /* output queue */ 93 /* procedure handles */ 94 int (*if_init)(); /* init routine */ 95 int (*if_output)(); /* output routine (enqueue) */ 96 int (*if_start)(); /* initiate output routine */ 97 int (*if_done)(); /* output complete routine */ 98 int (*if_ioctl)(); /* ioctl routine */ 99 int (*if_reset)(); /* bus reset routine */ 100 int (*if_watchdog)(); /* timer routine */ 101 /* generic interface statistics */ 102 int if_ipackets; /* packets received on interface */ 103 int if_ierrors; /* input errors on interface */ 104 int if_opackets; /* packets sent on interface */ 105 int if_oerrors; /* output errors on interface */ 106 int if_collisions; /* collisions on csma interfaces */ 107 /* end statistics */ 108 struct ifnet *if_next; 109 u_char if_type; /* ethernet, tokenring, etc */ 110 u_char if_addrlen; /* media address length */ 111 u_char if_hdrlen; /* media header length */ 112 u_char if_index; /* numeric abbreviation for this if */ 113 /* more statistics here to avoid recompiling netstat */ 114 struct timeval if_lastchange; /* last updated */ 115 int if_ibytes; /* total number of octets received */ 116 int if_obytes; /* total number of octets sent */ 117 int if_imcasts; /* packets received via multicast */ 118 int if_omcasts; /* packets sent via multicast */ 119 int if_iqdrops; /* dropped on input, this interface */ 120 int if_noproto; /* destined for unsupported protocol */ 121 int if_baudrate; /* linespeed */ 122 int if_pcount; /* number of promiscuous listeners */ 123 }; 124 125 #define IFF_UP 0x1 /* interface is up */ 126 #define IFF_BROADCAST 0x2 /* broadcast address valid */ 127 #define IFF_DEBUG 0x4 /* turn on debugging */ 128 #define IFF_LOOPBACK 0x8 /* is a loopback net */ 129 #define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */ 130 #define IFF_NOTRAILERS 0x20 /* avoid use of trailers */ 131 #define IFF_RUNNING 0x40 /* resources allocated */ 132 #define IFF_NOARP 0x80 /* no address resolution protocol */ 133 /* next two not supported now, but reserved: */ 134 #define IFF_PROMISC 0x100 /* receive all packets */ 135 #define IFF_ALLMULTI 0x200 /* receive all multicast packets */ 136 #define IFF_OACTIVE 0x400 /* transmission in progress */ 137 #define IFF_SIMPLEX 0x800 /* can't hear own transmissions */ 138 #define IFF_LLC0 0x1000 /* interface driver control/status */ 139 #define IFF_LLC1 0x2000 /* interface driver control/status */ 140 #define IFF_LLC2 0x4000 /* interface driver control/status */ 141 142 /* flags set internally only: */ 143 #define IFF_CANTCHANGE \ 144 (IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|IFF_SIMPLEX) 145 146 /* 147 * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1) 148 * input routines have queues of messages stored on ifqueue structures 149 * (defined above). Entries are added to and deleted from these structures 150 * by these macros, which should be called with ipl raised to splimp(). 151 */ 152 #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 153 #define IF_DROP(ifq) ((ifq)->ifq_drops++) 154 #define IF_ENQUEUE(ifq, m) { \ 155 (m)->m_nextpkt = 0; \ 156 if ((ifq)->ifq_tail == 0) \ 157 (ifq)->ifq_head = m; \ 158 else \ 159 (ifq)->ifq_tail->m_nextpkt = m; \ 160 (ifq)->ifq_tail = m; \ 161 (ifq)->ifq_len++; \ 162 } 163 #define IF_PREPEND(ifq, m) { \ 164 (m)->m_nextpkt = (ifq)->ifq_head; \ 165 if ((ifq)->ifq_tail == 0) \ 166 (ifq)->ifq_tail = (m); \ 167 (ifq)->ifq_head = (m); \ 168 (ifq)->ifq_len++; \ 169 } 170 #define IF_DEQUEUE(ifq, m) { \ 171 (m) = (ifq)->ifq_head; \ 172 if (m) { \ 173 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \ 174 (ifq)->ifq_tail = 0; \ 175 (m)->m_nextpkt = 0; \ 176 (ifq)->ifq_len--; \ 177 } \ 178 } 179 180 #define IFQ_MAXLEN 50 181 #define IFNET_SLOWHZ 1 /* granularity is 1 second */ 182 183 /* 184 * The ifaddr structure contains information about one address 185 * of an interface. They are maintained by the different address families, 186 * are allocated and attached when an address is set, and are linked 187 * together so all addresses for an interface can be located. 188 */ 189 struct ifaddr { 190 struct sockaddr *ifa_addr; /* address of interface */ 191 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 192 #define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 193 struct sockaddr *ifa_netmask; /* used to determine subnet */ 194 struct ifnet *ifa_ifp; /* back-pointer to interface */ 195 struct ifaddr *ifa_next; /* next address for interface */ 196 int (*ifa_rtrequest)(); /* check or clean routes (+ or -)'d */ 197 struct rtentry *ifa_rt; /* ??? for ROUTETOIF */ 198 u_short ifa_flags; /* mostly rt_flags for cloning */ 199 u_short ifa_llinfolen; /* extra to malloc for link info */ 200 }; 201 #define IFA_ROUTE RTF_UP /* route installed */ 202 /* 203 * Interface request structure used for socket 204 * ioctl's. All interface ioctl's must have parameter 205 * definitions which begin with ifr_name. The 206 * remainder may be interface specific. 207 */ 208 struct ifreq { 209 #define IFNAMSIZ 16 210 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 211 union { 212 struct sockaddr ifru_addr; 213 struct sockaddr ifru_dstaddr; 214 struct sockaddr ifru_broadaddr; 215 short ifru_flags; 216 int ifru_metric; 217 caddr_t ifru_data; 218 } ifr_ifru; 219 #define ifr_addr ifr_ifru.ifru_addr /* address */ 220 #define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */ 221 #define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */ 222 #define ifr_flags ifr_ifru.ifru_flags /* flags */ 223 #define ifr_metric ifr_ifru.ifru_metric /* metric */ 224 #define ifr_data ifr_ifru.ifru_data /* for use by interface */ 225 }; 226 227 struct ifaliasreq { 228 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 229 struct sockaddr ifra_addr; 230 struct sockaddr ifra_broadaddr; 231 struct sockaddr ifra_mask; 232 }; 233 234 /* 235 * Structure used in SIOCGIFCONF request. 236 * Used to retrieve interface configuration 237 * for machine (useful for programs which 238 * must know all networks accessible). 239 */ 240 struct ifconf { 241 int ifc_len; /* size of associated buffer */ 242 union { 243 caddr_t ifcu_buf; 244 struct ifreq *ifcu_req; 245 } ifc_ifcu; 246 #define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */ 247 #define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */ 248 }; 249 250 #ifdef KERNEL 251 #include "../net/if_arp.h" 252 struct ifqueue rawintrq; /* raw packet input queue */ 253 struct ifnet *ifnet; 254 struct ifaddr *ifa_ifwithaddr(), *ifa_ifwithnet(); 255 struct ifaddr *ifa_ifwithdstaddr(); 256 #else KERNEL 257 #include <net/if_arp.h> 258 #endif KERNEL 259 260 #endif /* !_NET_IF_H_ */ 261