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 * $Id$ 34 */ 35 36 /* 37 * Structures defining a network interface, providing a packet 38 * transport mechanism (ala level 0 of the PUP protocols). 39 * 40 * Each interface accepts output datagrams of a specified maximum 41 * length, and provides higher level routines with input datagrams 42 * received from its medium. 43 * 44 * Output occurs when the routine if_output is called, with three parameters: 45 * (*ifp->if_output)(ifp, m, dst) 46 * Here m is the mbuf chain to be sent and dst is the destination address. 47 * The output routine encapsulates the supplied datagram if necessary, 48 * and then transmits it on its medium. 49 * 50 * On input, each interface unwraps the data received by it, and either 51 * places it on the input queue of a internetwork datagram routine 52 * and posts the associated software interrupt, or passes the datagram to a raw 53 * packet input routine. 54 * 55 * Routines exist for locating interfaces by their addresses 56 * or for locating a interface on a certain network, as well as more general 57 * routing and gateway routines maintaining information used to locate 58 * interfaces. These routines live in the files if.c and route.c 59 */ 60 #ifdef KERNEL 61 #include "sys/time.h" 62 #else 63 #include <sys/time.h> 64 #endif 65 66 /* 67 * Structure defining a queue for a network interface. 68 * 69 * (Would like to call this struct ``if'', but C isn't PL/1.) 70 */ 71 72 struct ifnet { 73 char *if_name; /* name, e.g. ``en'' or ``lo'' */ 74 short if_unit; /* sub-unit for lower level driver */ 75 u_short if_mtu; /* maximum transmission unit */ 76 short if_flags; /* up/down, broadcast, etc. */ 77 u_short if_timer; /* time 'til if_watchdog called */ 78 int if_metric; /* routing metric (external only) */ 79 struct ifaddr *if_addrlist; /* linked list of addresses per if */ 80 struct ifqueue { 81 struct mbuf *ifq_head; 82 struct mbuf *ifq_tail; 83 int ifq_len; 84 int ifq_maxlen; 85 int ifq_drops; 86 } if_snd; /* output queue */ 87 /* procedure handles */ 88 void (*if_init)(int); /* init routine */ 89 int (*if_output)(); /* output routine (enqueue) */ 90 void (*if_start) /* initiate output routine */ 91 (struct ifnet *); 92 int (*if_done)(); /* output complete routine */ 93 int (*if_ioctl) /* ioctl routine */ 94 (struct ifnet *, int, caddr_t); 95 void (*if_reset)(int, int); /* bus reset routine */ 96 void (*if_watchdog)(int); /* timer routine */ 97 /* generic interface statistics */ 98 int if_ipackets; /* packets received on interface */ 99 int if_ierrors; /* input errors on interface */ 100 int if_opackets; /* packets sent on interface */ 101 int if_oerrors; /* output errors on interface */ 102 int if_collisions; /* collisions on csma interfaces */ 103 /* end statistics */ 104 struct ifnet *if_next; 105 u_char if_type; /* ethernet, tokenring, etc */ 106 u_char if_addrlen; /* media address length */ 107 u_char if_hdrlen; /* media header length */ 108 u_char if_index; /* numeric abbreviation for this if */ 109 /* more statistics here to avoid recompiling netstat */ 110 struct timeval if_lastchange; /* last updated */ 111 int if_ibytes; /* total number of octets received */ 112 int if_obytes; /* total number of octets sent */ 113 int if_imcasts; /* packets received via multicast */ 114 int if_omcasts; /* packets sent via multicast */ 115 int if_iqdrops; /* dropped on input, this interface */ 116 int if_noproto; /* destined for unsupported protocol */ 117 int if_baudrate; /* linespeed */ 118 int if_pcount; /* number of promiscuous listeners */ 119 }; 120 121 #define IFF_UP 0x1 /* interface is up */ 122 #define IFF_BROADCAST 0x2 /* broadcast address valid */ 123 #define IFF_DEBUG 0x4 /* turn on debugging */ 124 #define IFF_LOOPBACK 0x8 /* is a loopback net */ 125 #define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */ 126 #define IFF_NOTRAILERS 0x20 /* avoid use of trailers */ 127 #define IFF_RUNNING 0x40 /* resources allocated */ 128 #define IFF_NOARP 0x80 /* no address resolution protocol */ 129 /* next two not supported now, but reserved: */ 130 #define IFF_PROMISC 0x100 /* receive all packets */ 131 #define IFF_ALLMULTI 0x200 /* receive all multicast packets */ 132 #define IFF_OACTIVE 0x400 /* transmission in progress */ 133 #define IFF_SIMPLEX 0x800 /* can't hear own transmissions */ 134 #define IFF_LLC0 0x1000 /* interface driver control/status */ 135 #define IFF_LLC1 0x2000 /* interface driver control/status */ 136 #define IFF_LLC2 0x4000 /* interface driver control/status */ 137 138 /* flags set internally only: */ 139 #define IFF_CANTCHANGE \ 140 (IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|IFF_SIMPLEX) 141 142 /* 143 * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1) 144 * input routines have queues of messages stored on ifqueue structures 145 * (defined above). Entries are added to and deleted from these structures 146 * by these macros, which should be called with ipl raised to splimp(). 147 */ 148 #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 149 #define IF_DROP(ifq) ((ifq)->ifq_drops++) 150 #define IF_ENQUEUE(ifq, m) { \ 151 (m)->m_nextpkt = 0; \ 152 if ((ifq)->ifq_tail == 0) \ 153 (ifq)->ifq_head = m; \ 154 else \ 155 (ifq)->ifq_tail->m_nextpkt = m; \ 156 (ifq)->ifq_tail = m; \ 157 (ifq)->ifq_len++; \ 158 } 159 #define IF_PREPEND(ifq, m) { \ 160 (m)->m_nextpkt = (ifq)->ifq_head; \ 161 if ((ifq)->ifq_tail == 0) \ 162 (ifq)->ifq_tail = (m); \ 163 (ifq)->ifq_head = (m); \ 164 (ifq)->ifq_len++; \ 165 } 166 #define IF_DEQUEUE(ifq, m) { \ 167 (m) = (ifq)->ifq_head; \ 168 if (m) { \ 169 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \ 170 (ifq)->ifq_tail = 0; \ 171 (m)->m_nextpkt = 0; \ 172 (ifq)->ifq_len--; \ 173 } \ 174 } 175 176 #define IFQ_MAXLEN 50 177 #define IFNET_SLOWHZ 1 /* granularity is 1 second */ 178 179 /* 180 * The ifaddr structure contains information about one address 181 * of an interface. They are maintained by the different address families, 182 * are allocated and attached when an address is set, and are linked 183 * together so all addresses for an interface can be located. 184 */ 185 struct ifaddr { 186 struct sockaddr *ifa_addr; /* address of interface */ 187 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 188 #define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 189 struct sockaddr *ifa_netmask; /* used to determine subnet */ 190 struct ifnet *ifa_ifp; /* back-pointer to interface */ 191 struct ifaddr *ifa_next; /* next address for interface */ 192 int (*ifa_rtrequest)(); /* check or clean routes (+ or -)'d */ 193 struct rtentry *ifa_rt; /* ??? for ROUTETOIF */ 194 u_short ifa_flags; /* mostly rt_flags for cloning */ 195 u_short ifa_llinfolen; /* extra to malloc for link info */ 196 }; 197 #define IFA_ROUTE RTF_UP /* route installed */ 198 /* 199 * Interface request structure used for socket 200 * ioctl's. All interface ioctl's must have parameter 201 * definitions which begin with ifr_name. The 202 * remainder may be interface specific. 203 */ 204 struct ifreq { 205 #define IFNAMSIZ 16 206 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 207 union { 208 struct sockaddr ifru_addr; 209 struct sockaddr ifru_dstaddr; 210 struct sockaddr ifru_broadaddr; 211 short ifru_flags; 212 int ifru_metric; 213 caddr_t ifru_data; 214 } ifr_ifru; 215 #define ifr_addr ifr_ifru.ifru_addr /* address */ 216 #define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */ 217 #define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */ 218 #define ifr_flags ifr_ifru.ifru_flags /* flags */ 219 #define ifr_metric ifr_ifru.ifru_metric /* metric */ 220 #define ifr_data ifr_ifru.ifru_data /* for use by interface */ 221 }; 222 223 struct ifaliasreq { 224 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 225 struct sockaddr ifra_addr; 226 struct sockaddr ifra_broadaddr; 227 struct sockaddr ifra_mask; 228 }; 229 230 /* 231 * Structure used in SIOCGIFCONF request. 232 * Used to retrieve interface configuration 233 * for machine (useful for programs which 234 * must know all networks accessible). 235 */ 236 struct ifconf { 237 int ifc_len; /* size of associated buffer */ 238 union { 239 caddr_t ifcu_buf; 240 struct ifreq *ifcu_req; 241 } ifc_ifcu; 242 #define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */ 243 #define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */ 244 }; 245 246 #include "if_arp.h" 247 #ifdef KERNEL 248 #ifdef nope 249 extern struct ifqueue rawintrq; /* raw packet input queue */ 250 extern struct ifnet *ifnet; 251 struct ifaddr *ifa_ifwithaddr(), *ifa_ifwithnet(); 252 struct ifaddr *ifa_ifwithdstaddr(); 253 #endif 254 255 /* interface symbols */ 256 #define __ISYM_VERSION__ "1" /* XXX RCS major revision number of hdr file */ 257 #include "isym.h" /* this header has interface symbols */ 258 259 /* global variables used in core kernel and other modules */ 260 __ISYM__(int, if_index,) /* */ 261 __ISYM__(struct ifqueue, rawintrq,) /* raw packet input queue */ 262 __ISYM__(struct ifnet *, ifnet,) 263 264 /* functions used in modules */ 265 __ISYM__(int, if_attach, (struct ifnet *)) /* XXX void */ 266 __ISYM__(struct ifaddr *, ifa_ifwithaddr, (struct sockaddr *)) 267 __ISYM__(struct ifaddr *, ifa_ifwithnet, (struct sockaddr *)) 268 __ISYM__(struct ifaddr *, ifa_ifwithdstaddr, (struct sockaddr *)) 269 __ISYM__(int, ifioctl, (struct socket *so, int cmd, caddr_t data, struct proc *p)) 270 271 #undef __ISYM__ 272 #undef __ISYM_ALIAS__ 273 #undef __ISYM_VERSION__ 274 275 #endif KERNEL 276