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cb1c44c2 KM |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
6 | * @(#)if.h 6.7 (Berkeley) %G% | |
7 | */ | |
665ce890 BJ |
8 | |
9 | /* | |
f1b2fa5b BJ |
10 | * Structures defining a network interface, providing a packet |
11 | * transport mechanism (ala level 0 of the PUP protocols). | |
12 | * | |
13 | * Each interface accepts output datagrams of a specified maximum | |
14 | * length, and provides higher level routines with input datagrams | |
15 | * received from its medium. | |
16 | * | |
17 | * Output occurs when the routine if_output is called, with three parameters: | |
ee787340 SL |
18 | * (*ifp->if_output)(ifp, m, dst) |
19 | * Here m is the mbuf chain to be sent and dst is the destination address. | |
20 | * The output routine encapsulates the supplied datagram if necessary, | |
21 | * and then transmits it on its medium. | |
f1b2fa5b BJ |
22 | * |
23 | * On input, each interface unwraps the data received by it, and either | |
24 | * places it on the input queue of a internetwork datagram routine | |
25 | * and posts the associated software interrupt, or passes the datagram to a raw | |
26 | * packet input routine. | |
27 | * | |
ee787340 | 28 | * Routines exist for locating interfaces by their addresses |
f1b2fa5b BJ |
29 | * or for locating a interface on a certain network, as well as more general |
30 | * routing and gateway routines maintaining information used to locate | |
ee787340 | 31 | * interfaces. These routines live in the files if.c and route.c |
8a13b737 | 32 | */ |
8a13b737 BJ |
33 | |
34 | /* | |
35 | * Structure defining a queue for a network interface. | |
665ce890 BJ |
36 | * |
37 | * (Would like to call this struct ``if'', but C isn't PL/1.) | |
38 | */ | |
39 | struct ifnet { | |
b454c3ea | 40 | char *if_name; /* name, e.g. ``en'' or ``lo'' */ |
665ce890 | 41 | short if_unit; /* sub-unit for lower level driver */ |
665ce890 | 42 | short if_mtu; /* maximum transmission unit */ |
ee787340 | 43 | short if_flags; /* up/down, broadcast, etc. */ |
de602274 | 44 | short if_timer; /* time 'til if_watchdog called */ |
63de846e | 45 | struct ifaddr *if_addrlist; /* linked list of addresses per if */ |
f1b2fa5b BJ |
46 | struct ifqueue { |
47 | struct mbuf *ifq_head; | |
48 | struct mbuf *ifq_tail; | |
1e977657 BJ |
49 | int ifq_len; |
50 | int ifq_maxlen; | |
51 | int ifq_drops; | |
f1b2fa5b BJ |
52 | } if_snd; /* output queue */ |
53 | /* procedure handles */ | |
54 | int (*if_init)(); /* init routine */ | |
8a13b737 | 55 | int (*if_output)(); /* output routine */ |
a62dd253 | 56 | int (*if_ioctl)(); /* ioctl routine */ |
b3691eab | 57 | int (*if_reset)(); /* bus reset routine */ |
de602274 | 58 | int (*if_watchdog)(); /* timer routine */ |
f1b2fa5b | 59 | /* generic interface statistics */ |
b454c3ea BJ |
60 | int if_ipackets; /* packets received on interface */ |
61 | int if_ierrors; /* input errors on interface */ | |
62 | int if_opackets; /* packets sent on interface */ | |
63 | int if_oerrors; /* output errors on interface */ | |
f1b2fa5b | 64 | int if_collisions; /* collisions on csma interfaces */ |
f1b2fa5b | 65 | /* end statistics */ |
4ad99bae | 66 | struct ifnet *if_next; |
665ce890 BJ |
67 | }; |
68 | ||
ee787340 SL |
69 | #define IFF_UP 0x1 /* interface is up */ |
70 | #define IFF_BROADCAST 0x2 /* broadcast address valid */ | |
71 | #define IFF_DEBUG 0x4 /* turn on debugging */ | |
63de846e | 72 | /* was IFF_ROUTE 0x8 /* routing entry installed */ |
dc39362e | 73 | #define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */ |
a62dd253 | 74 | #define IFF_NOTRAILERS 0x20 /* avoid use of trailers */ |
81889e84 | 75 | #define IFF_RUNNING 0x40 /* resources allocated */ |
2effa891 | 76 | #define IFF_NOARP 0x80 /* no address resolution protocol */ |
63de846e MK |
77 | /* flags set internally only: */ |
78 | #define IFF_CANTCHANGE (IFF_BROADCAST | IFF_POINTOPOINT | IFF_RUNNING) | |
ee787340 | 79 | |
f1b2fa5b BJ |
80 | /* |
81 | * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1) | |
82 | * input routines have queues of messages stored on ifqueue structures | |
83 | * (defined above). Entries are added to and deleted from these structures | |
84 | * by these macros, which should be called with ipl raised to splimp(). | |
85 | */ | |
1e977657 BJ |
86 | #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) |
87 | #define IF_DROP(ifq) ((ifq)->ifq_drops++) | |
8a13b737 BJ |
88 | #define IF_ENQUEUE(ifq, m) { \ |
89 | (m)->m_act = 0; \ | |
90 | if ((ifq)->ifq_tail == 0) \ | |
405c9168 | 91 | (ifq)->ifq_head = m; \ |
8a13b737 BJ |
92 | else \ |
93 | (ifq)->ifq_tail->m_act = m; \ | |
405c9168 | 94 | (ifq)->ifq_tail = m; \ |
1e977657 | 95 | (ifq)->ifq_len++; \ |
8a13b737 | 96 | } |
e740a894 BJ |
97 | #define IF_PREPEND(ifq, m) { \ |
98 | (m)->m_act = (ifq)->ifq_head; \ | |
1dd55890 BJ |
99 | if ((ifq)->ifq_tail == 0) \ |
100 | (ifq)->ifq_tail = (m); \ | |
e740a894 | 101 | (ifq)->ifq_head = (m); \ |
1e977657 | 102 | (ifq)->ifq_len++; \ |
e740a894 | 103 | } |
8a13b737 BJ |
104 | #define IF_DEQUEUE(ifq, m) { \ |
105 | (m) = (ifq)->ifq_head; \ | |
106 | if (m) { \ | |
107 | if (((ifq)->ifq_head = (m)->m_act) == 0) \ | |
108 | (ifq)->ifq_tail = 0; \ | |
109 | (m)->m_act = 0; \ | |
1e977657 | 110 | (ifq)->ifq_len--; \ |
8a13b737 BJ |
111 | } \ |
112 | } | |
665ce890 | 113 | |
1e977657 | 114 | #define IFQ_MAXLEN 50 |
de602274 | 115 | #define IFNET_SLOWHZ 1 /* granularity is 1 second */ |
1e977657 | 116 | |
63de846e MK |
117 | /* |
118 | * The ifaddr structure contains information about one address | |
119 | * of an interface. They are maintained by the different address families, | |
120 | * are allocated and attached when an address is set, and are linked | |
121 | * together so all addresses for an interface can be located. | |
122 | */ | |
123 | struct ifaddr { | |
124 | struct sockaddr ifa_addr; /* address of interface */ | |
125 | union { | |
126 | struct sockaddr ifu_broadaddr; | |
127 | struct sockaddr ifu_dstaddr; | |
128 | } ifa_ifu; | |
129 | #define ifa_broadaddr ifa_ifu.ifu_broadaddr /* broadcast address */ | |
130 | #define ifa_dstaddr ifa_ifu.ifu_dstaddr /* other end of p-to-p link */ | |
131 | struct ifnet *ifa_ifp; /* back-pointer to interface */ | |
132 | struct ifaddr *ifa_next; /* next address for interface */ | |
133 | }; | |
134 | ||
0c33c832 | 135 | /* |
a62dd253 SL |
136 | * Interface request structure used for socket |
137 | * ioctl's. All interface ioctl's must have parameter | |
138 | * definitions which begin with ifr_name. The | |
139 | * remainder may be interface specific. | |
0c33c832 SL |
140 | */ |
141 | struct ifreq { | |
a62dd253 SL |
142 | #define IFNAMSIZ 16 |
143 | char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ | |
0c33c832 SL |
144 | union { |
145 | struct sockaddr ifru_addr; | |
146 | struct sockaddr ifru_dstaddr; | |
bdef13f6 | 147 | struct sockaddr ifru_broadaddr; |
0c33c832 | 148 | short ifru_flags; |
a62dd253 | 149 | caddr_t ifru_data; |
0c33c832 SL |
150 | } ifr_ifru; |
151 | #define ifr_addr ifr_ifru.ifru_addr /* address */ | |
152 | #define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */ | |
bdef13f6 | 153 | #define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */ |
0c33c832 | 154 | #define ifr_flags ifr_ifru.ifru_flags /* flags */ |
a62dd253 | 155 | #define ifr_data ifr_ifru.ifru_data /* for use by interface */ |
0c33c832 SL |
156 | }; |
157 | ||
158 | /* | |
159 | * Structure used in SIOCGIFCONF request. | |
160 | * Used to retrieve interface configuration | |
161 | * for machine (useful for programs which | |
162 | * must know all networks accessible). | |
163 | */ | |
164 | struct ifconf { | |
165 | int ifc_len; /* size of associated buffer */ | |
166 | union { | |
167 | caddr_t ifcu_buf; | |
168 | struct ifreq *ifcu_req; | |
169 | } ifc_ifcu; | |
170 | #define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */ | |
171 | #define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */ | |
172 | }; | |
173 | ||
cf09d0b0 MK |
174 | /* |
175 | * ARP ioctl request | |
176 | */ | |
177 | struct arpreq { | |
178 | struct sockaddr arp_pa; /* protocol address */ | |
179 | struct sockaddr arp_ha; /* hardware address */ | |
180 | int arp_flags; /* flags */ | |
181 | }; | |
182 | /* arp_flags and at_flags field values */ | |
183 | #define ATF_INUSE 1 /* entry in use */ | |
184 | #define ATF_COM 2 /* completed entry (enaddr valid) */ | |
185 | #define ATF_PERM 4 /* permanent entry */ | |
186 | #define ATF_PUBL 8 /* publish entry (respond for other host) */ | |
187 | ||
665ce890 | 188 | #ifdef KERNEL |
8a13b737 BJ |
189 | #ifdef INET |
190 | struct ifqueue ipintrq; /* ip packet input queue */ | |
191 | #endif | |
ee787340 | 192 | struct ifqueue rawintrq; /* raw packet input queue */ |
665ce890 | 193 | struct ifnet *ifnet; |
63de846e | 194 | struct ifaddr *ifa_ifwithaddr(), *ifa_ifwithnet(), *ifa_ifwithaf(); |
665ce890 | 195 | #endif |