1 /* 2 * Copyright (c) 1982, 1986, 1989 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)if.h 7.14 (Berkeley) 01/30/92 8 */ 9 10 /* 11 * Structures defining a network interface, providing a packet 12 * transport mechanism (ala level 0 of the PUP protocols). 13 * 14 * Each interface accepts output datagrams of a specified maximum 15 * length, and provides higher level routines with input datagrams 16 * received from its medium. 17 * 18 * Output occurs when the routine if_output is called, with three parameters: 19 * (*ifp->if_output)(ifp, m, dst, rt) 20 * Here m is the mbuf chain to be sent and dst is the destination address. 21 * The output routine encapsulates the supplied datagram if necessary, 22 * and then transmits it on its medium. 23 * 24 * On input, each interface unwraps the data received by it, and either 25 * places it on the input queue of a internetwork datagram routine 26 * and posts the associated software interrupt, or passes the datagram to a raw 27 * packet input routine. 28 * 29 * Routines exist for locating interfaces by their addresses 30 * or for locating a interface on a certain network, as well as more general 31 * routing and gateway routines maintaining information used to locate 32 * interfaces. These routines live in the files if.c and route.c 33 */ 34 #ifndef _TIME_ /* XXX fast fix for SNMP, going away soon */ 35 #ifdef KERNEL 36 #include "../sys/time.h" 37 #else 38 #include <sys/time.h> 39 #endif 40 #endif 41 42 /* 43 * Structure defining a queue for a network interface. 44 * 45 * (Would like to call this struct ``if'', but C isn't PL/1.) 46 */ 47 48 struct ifnet { 49 char *if_name; /* name, e.g. ``en'' or ``lo'' */ 50 short if_unit; /* sub-unit for lower level driver */ 51 short if_mtu; /* maximum transmission unit */ 52 short if_flags; /* up/down, broadcast, etc. */ 53 short if_timer; /* time 'til if_watchdog called */ 54 int if_metric; /* routing metric (external only) */ 55 struct ifaddr *if_addrlist; /* linked list of addresses per if */ 56 struct ifqueue { 57 struct mbuf *ifq_head; 58 struct mbuf *ifq_tail; 59 int ifq_len; 60 int ifq_maxlen; 61 int ifq_drops; 62 } if_snd; /* output queue */ 63 /* procedure handles */ 64 int (*if_init) /* init routine */ 65 __P((int)); 66 int (*if_output) /* output routine (enqueue) */ 67 __P((struct ifnet *, struct mbuf *, struct sockaddr *, 68 struct rtentry *)); 69 int (*if_start) /* initiate output routine */ 70 __P((struct ifnet *)); 71 int (*if_done) /* output complete routine */ 72 __P((struct ifnet *)); /* (XXX not used; fake prototype) */ 73 int (*if_ioctl) /* ioctl routine */ 74 __P((struct ifnet *, int, caddr_t)); 75 int (*if_reset) /* XXX; Unibus reset routine for vax */ 76 __P((int, int)); /* new autoconfig will permit removal */ 77 int (*if_watchdog) /* timer routine */ 78 __P((int)); 79 /* generic interface statistics */ 80 int if_ipackets; /* packets received on interface */ 81 int if_ierrors; /* input errors on interface */ 82 int if_opackets; /* packets sent on interface */ 83 int if_oerrors; /* output errors on interface */ 84 int if_collisions; /* collisions on csma interfaces */ 85 /* end statistics */ 86 struct ifnet *if_next; 87 u_char if_type; /* ethernet, tokenring, etc */ 88 u_char if_addrlen; /* media address length */ 89 u_char if_hdrlen; /* media header length */ 90 u_char if_index; /* numeric abbreviation for this if */ 91 /* more statistics here to avoid recompiling netstat */ 92 struct timeval if_lastchange; /* last updated */ 93 int if_ibytes; /* total number of octets received */ 94 int if_obytes; /* total number of octets sent */ 95 int if_imcasts; /* packets received via multicast */ 96 int if_omcasts; /* packets sent via multicast */ 97 int if_iqdrops; /* dropped on input, this interface */ 98 int if_noproto; /* destined for unsupported protocol */ 99 int if_baudrate; /* linespeed */ 100 int if_pcount; /* number of promiscuous listeners */ 101 }; 102 103 #define IFF_UP 0x1 /* interface is up */ 104 #define IFF_BROADCAST 0x2 /* broadcast address valid */ 105 #define IFF_DEBUG 0x4 /* turn on debugging */ 106 #define IFF_LOOPBACK 0x8 /* is a loopback net */ 107 #define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */ 108 #define IFF_NOTRAILERS 0x20 /* avoid use of trailers */ 109 #define IFF_RUNNING 0x40 /* resources allocated */ 110 #define IFF_NOARP 0x80 /* no address resolution protocol */ 111 /* next two not supported now, but reserved: */ 112 #define IFF_PROMISC 0x100 /* receive all packets */ 113 #define IFF_ALLMULTI 0x200 /* receive all multicast packets */ 114 #define IFF_OACTIVE 0x400 /* transmission in progress */ 115 #define IFF_SIMPLEX 0x800 /* can't hear own transmissions */ 116 #define IFF_LINK0 0x1000 /* per link layer defined bit */ 117 #define IFF_LINK1 0x2000 /* per link layer defined bit */ 118 #define IFF_LINK2 0x4000 /* per link layer defined bit */ 119 120 /* flags set internally only: */ 121 #define IFF_CANTCHANGE \ 122 (IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|IFF_SIMPLEX) 123 124 /* 125 * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1) 126 * input routines have queues of messages stored on ifqueue structures 127 * (defined above). Entries are added to and deleted from these structures 128 * by these macros, which should be called with ipl raised to splimp(). 129 */ 130 #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 131 #define IF_DROP(ifq) ((ifq)->ifq_drops++) 132 #define IF_ENQUEUE(ifq, m) { \ 133 (m)->m_nextpkt = 0; \ 134 if ((ifq)->ifq_tail == 0) \ 135 (ifq)->ifq_head = m; \ 136 else \ 137 (ifq)->ifq_tail->m_nextpkt = m; \ 138 (ifq)->ifq_tail = m; \ 139 (ifq)->ifq_len++; \ 140 } 141 #define IF_PREPEND(ifq, m) { \ 142 (m)->m_nextpkt = (ifq)->ifq_head; \ 143 if ((ifq)->ifq_tail == 0) \ 144 (ifq)->ifq_tail = (m); \ 145 (ifq)->ifq_head = (m); \ 146 (ifq)->ifq_len++; \ 147 } 148 #define IF_DEQUEUE(ifq, m) { \ 149 (m) = (ifq)->ifq_head; \ 150 if (m) { \ 151 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \ 152 (ifq)->ifq_tail = 0; \ 153 (m)->m_nextpkt = 0; \ 154 (ifq)->ifq_len--; \ 155 } \ 156 } 157 158 #define IFQ_MAXLEN 50 159 #define IFNET_SLOWHZ 1 /* granularity is 1 second */ 160 161 /* 162 * The ifaddr structure contains information about one address 163 * of an interface. They are maintained by the different address families, 164 * are allocated and attached when an address is set, and are linked 165 * together so all addresses for an interface can be located. 166 */ 167 struct ifaddr { 168 struct sockaddr *ifa_addr; /* address of interface */ 169 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 170 #define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 171 struct sockaddr *ifa_netmask; /* used to determine subnet */ 172 struct ifnet *ifa_ifp; /* back-pointer to interface */ 173 struct ifaddr *ifa_next; /* next address for interface */ 174 int (*ifa_rtrequest)(); /* check or clean routes (+ or -)'d */ 175 struct rtentry *ifa_rt; /* ??? for ROUTETOIF */ 176 u_short ifa_flags; /* mostly rt_flags for cloning */ 177 short ifa_refcnt; /* extra to malloc for link info */ 178 }; 179 #define IFA_ROUTE RTF_UP /* route installed */ 180 /* 181 * Interface request structure used for socket 182 * ioctl's. All interface ioctl's must have parameter 183 * definitions which begin with ifr_name. The 184 * remainder may be interface specific. 185 */ 186 struct ifreq { 187 #define IFNAMSIZ 16 188 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 189 union { 190 struct sockaddr ifru_addr; 191 struct sockaddr ifru_dstaddr; 192 struct sockaddr ifru_broadaddr; 193 short ifru_flags; 194 int ifru_metric; 195 caddr_t ifru_data; 196 } ifr_ifru; 197 #define ifr_addr ifr_ifru.ifru_addr /* address */ 198 #define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */ 199 #define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */ 200 #define ifr_flags ifr_ifru.ifru_flags /* flags */ 201 #define ifr_metric ifr_ifru.ifru_metric /* metric */ 202 #define ifr_data ifr_ifru.ifru_data /* for use by interface */ 203 }; 204 205 struct ifaliasreq { 206 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 207 struct sockaddr ifra_addr; 208 struct sockaddr ifra_broadaddr; 209 struct sockaddr ifra_mask; 210 }; 211 212 /* 213 * Structure used in SIOCGIFCONF request. 214 * Used to retrieve interface configuration 215 * for machine (useful for programs which 216 * must know all networks accessible). 217 */ 218 struct ifconf { 219 int ifc_len; /* size of associated buffer */ 220 union { 221 caddr_t ifcu_buf; 222 struct ifreq *ifcu_req; 223 } ifc_ifcu; 224 #define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */ 225 #define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */ 226 }; 227 228 #ifdef KERNEL 229 #define IFAFREE(ifa) \ 230 if ((ifa)->ifa_refcnt <= 0) \ 231 ifafree(ifa); \ 232 else \ 233 (ifa)->ifa_refcnt--; 234 235 #include "../net/if_arp.h" 236 struct ifqueue rawintrq; /* raw packet input queue */ 237 struct ifnet *ifnet; 238 struct ifaddr *ifa_ifwithaddr __P((struct sockaddr *)), 239 *ifa_ifwithnet __P((struct sockaddr *)), 240 *ifa_ifwithdstaddr __P((struct sockaddr *)); 241 void ifafree __P((struct ifaddr *)); 242 void if_attach __P((struct ifnet *)); 243 #else KERNEL 244 #include <net/if_arp.h> 245 #endif KERNEL 246