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1.1 root 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: * @(#)if.h 7.11 (Berkeley) 3/19/91
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: #ifndef _TIME_ /* XXX fast fix for SNMP, going away soon */
61: #ifdef KERNEL
62: #include "../sys/time.h"
63: #else
64: #include <sys/time.h>
65: #endif
66: #endif
67:
68: /*
69: * Structure defining a queue for a network interface.
70: *
71: * (Would like to call this struct ``if'', but C isn't PL/1.)
72: */
73:
74: struct ifnet {
75: char *if_name; /* name, e.g. ``en'' or ``lo'' */
76: short if_unit; /* sub-unit for lower level driver */
77: short if_mtu; /* maximum transmission unit */
78: short if_flags; /* up/down, broadcast, etc. */
79: short if_timer; /* time 'til if_watchdog called */
80: int if_metric; /* routing metric (external only) */
81: struct ifaddr *if_addrlist; /* linked list of addresses per if */
82: struct ifqueue {
83: struct mbuf *ifq_head;
84: struct mbuf *ifq_tail;
85: int ifq_len;
86: int ifq_maxlen;
87: int ifq_drops;
88: } if_snd; /* output queue */
89: /* procedure handles */
90: int (*if_init)(); /* init routine */
91: int (*if_output)(); /* output routine (enqueue) */
92: int (*if_start)(); /* initiate output routine */
93: int (*if_done)(); /* output complete routine */
94: int (*if_ioctl)(); /* ioctl routine */
95: int (*if_reset)(); /* bus reset routine */
96: int (*if_watchdog)(); /* 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 */
1.1.1.2 ! root 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 */
1.1 root 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: #ifdef KERNEL
247: #include "../net/if_arp.h"
248: struct ifqueue rawintrq; /* raw packet input queue */
249: struct ifnet *ifnet;
250: struct ifaddr *ifa_ifwithaddr(), *ifa_ifwithnet();
251: struct ifaddr *ifa_ifwithdstaddr();
252: #else KERNEL
253: #include <net/if_arp.h>
254: #endif KERNEL
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