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 7.10 (Berkeley) 08/30/90 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) 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 int (*if_output)(); /* output routine (enqueue) */ 66 int (*if_start)(); /* initiate output routine */ 67 int (*if_done)(); /* output complete routine */ 68 int (*if_ioctl)(); /* ioctl routine */ 69 int (*if_reset)(); /* bus reset routine */ 70 int (*if_watchdog)(); /* timer routine */ 71 /* generic interface statistics */ 72 int if_ipackets; /* packets received on interface */ 73 int if_ierrors; /* input errors on interface */ 74 int if_opackets; /* packets sent on interface */ 75 int if_oerrors; /* output errors on interface */ 76 int if_collisions; /* collisions on csma interfaces */ 77 /* end statistics */ 78 struct ifnet *if_next; 79 u_char if_type; /* ethernet, tokenring, etc */ 80 u_char if_addrlen; /* media address length */ 81 u_char if_hdrlen; /* media header length */ 82 u_char if_index; /* numeric abbreviation for this if */ 83 /* more statistics here to avoid recompiling netstat */ 84 struct timeval if_lastchange; /* last updated */ 85 int if_ibytes; /* total number of octets received */ 86 int if_obytes; /* total number of octets sent */ 87 int if_imcasts; /* packets received via multicast */ 88 int if_omcasts; /* packets sent via multicast */ 89 int if_iqdrops; /* dropped on input, this interface */ 90 int if_noproto; /* destined for unsupported protocol */ 91 int if_baudrate; /* linespeed */ 92 }; 93 94 #define IFF_UP 0x1 /* interface is up */ 95 #define IFF_BROADCAST 0x2 /* broadcast address valid */ 96 #define IFF_DEBUG 0x4 /* turn on debugging */ 97 #define IFF_LOOPBACK 0x8 /* is a loopback net */ 98 #define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */ 99 #define IFF_NOTRAILERS 0x20 /* avoid use of trailers */ 100 #define IFF_RUNNING 0x40 /* resources allocated */ 101 #define IFF_NOARP 0x80 /* no address resolution protocol */ 102 /* next two not supported now, but reserved: */ 103 #define IFF_PROMISC 0x100 /* receive all packets */ 104 #define IFF_ALLMULTI 0x200 /* receive all multicast packets */ 105 #define IFF_OACTIVE 0x400 /* transmission in progress */ 106 #define IFF_SIMPLEX 0x800 /* can't hear own transmissions */ 107 108 /* flags set internally only: */ 109 #define IFF_CANTCHANGE \ 110 (IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|IFF_SIMPLEX) 111 112 /* 113 * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1) 114 * input routines have queues of messages stored on ifqueue structures 115 * (defined above). Entries are added to and deleted from these structures 116 * by these macros, which should be called with ipl raised to splimp(). 117 */ 118 #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 119 #define IF_DROP(ifq) ((ifq)->ifq_drops++) 120 #define IF_ENQUEUE(ifq, m) { \ 121 (m)->m_nextpkt = 0; \ 122 if ((ifq)->ifq_tail == 0) \ 123 (ifq)->ifq_head = m; \ 124 else \ 125 (ifq)->ifq_tail->m_nextpkt = m; \ 126 (ifq)->ifq_tail = m; \ 127 (ifq)->ifq_len++; \ 128 } 129 #define IF_PREPEND(ifq, m) { \ 130 (m)->m_nextpkt = (ifq)->ifq_head; \ 131 if ((ifq)->ifq_tail == 0) \ 132 (ifq)->ifq_tail = (m); \ 133 (ifq)->ifq_head = (m); \ 134 (ifq)->ifq_len++; \ 135 } 136 #define IF_DEQUEUE(ifq, m) { \ 137 (m) = (ifq)->ifq_head; \ 138 if (m) { \ 139 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \ 140 (ifq)->ifq_tail = 0; \ 141 (m)->m_nextpkt = 0; \ 142 (ifq)->ifq_len--; \ 143 } \ 144 } 145 146 #define IFQ_MAXLEN 50 147 #define IFNET_SLOWHZ 1 /* granularity is 1 second */ 148 149 /* 150 * The ifaddr structure contains information about one address 151 * of an interface. They are maintained by the different address families, 152 * are allocated and attached when an address is set, and are linked 153 * together so all addresses for an interface can be located. 154 */ 155 struct ifaddr { 156 struct sockaddr *ifa_addr; /* address of interface */ 157 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 158 #define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 159 struct sockaddr *ifa_netmask; /* used to determine subnet */ 160 struct ifnet *ifa_ifp; /* back-pointer to interface */ 161 struct ifaddr *ifa_next; /* next address for interface */ 162 int (*ifa_rtrequest)(); /* check or clean routes (+ or -)'d */ 163 struct rtentry *ifa_rt; /* ??? for ROUTETOIF */ 164 u_short ifa_flags; /* mostly rt_flags for cloning */ 165 u_short ifa_llinfolen; /* extra to malloc for link info */ 166 }; 167 #define IFA_ROUTE RTF_UP /* route installed */ 168 /* 169 * Interface request structure used for socket 170 * ioctl's. All interface ioctl's must have parameter 171 * definitions which begin with ifr_name. The 172 * remainder may be interface specific. 173 */ 174 struct ifreq { 175 #define IFNAMSIZ 16 176 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 177 union { 178 struct sockaddr ifru_addr; 179 struct sockaddr ifru_dstaddr; 180 struct sockaddr ifru_broadaddr; 181 short ifru_flags; 182 int ifru_metric; 183 caddr_t ifru_data; 184 } ifr_ifru; 185 #define ifr_addr ifr_ifru.ifru_addr /* address */ 186 #define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */ 187 #define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */ 188 #define ifr_flags ifr_ifru.ifru_flags /* flags */ 189 #define ifr_metric ifr_ifru.ifru_metric /* metric */ 190 #define ifr_data ifr_ifru.ifru_data /* for use by interface */ 191 }; 192 193 struct ifaliasreq { 194 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 195 struct sockaddr ifra_addr; 196 struct sockaddr ifra_broadaddr; 197 struct sockaddr ifra_mask; 198 }; 199 200 /* 201 * Structure used in SIOCGIFCONF request. 202 * Used to retrieve interface configuration 203 * for machine (useful for programs which 204 * must know all networks accessible). 205 */ 206 struct ifconf { 207 int ifc_len; /* size of associated buffer */ 208 union { 209 caddr_t ifcu_buf; 210 struct ifreq *ifcu_req; 211 } ifc_ifcu; 212 #define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */ 213 #define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */ 214 }; 215 216 #ifdef KERNEL 217 #include "../net/if_arp.h" 218 struct ifqueue rawintrq; /* raw packet input queue */ 219 struct ifnet *ifnet; 220 struct ifaddr *ifa_ifwithaddr(), *ifa_ifwithnet(); 221 struct ifaddr *ifa_ifwithdstaddr(); 222 #else KERNEL 223 #include <net/if_arp.h> 224 #endif KERNEL 225