Commit | Line | Data |
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0c33c832 | 1 | /* if.h 4.17 83/03/15 */ |
665ce890 BJ |
2 | |
3 | /* | |
f1b2fa5b BJ |
4 | * Structures defining a network interface, providing a packet |
5 | * transport mechanism (ala level 0 of the PUP protocols). | |
6 | * | |
7 | * Each interface accepts output datagrams of a specified maximum | |
8 | * length, and provides higher level routines with input datagrams | |
9 | * received from its medium. | |
10 | * | |
11 | * Output occurs when the routine if_output is called, with three parameters: | |
ee787340 SL |
12 | * (*ifp->if_output)(ifp, m, dst) |
13 | * Here m is the mbuf chain to be sent and dst is the destination address. | |
14 | * The output routine encapsulates the supplied datagram if necessary, | |
15 | * and then transmits it on its medium. | |
f1b2fa5b BJ |
16 | * |
17 | * On input, each interface unwraps the data received by it, and either | |
18 | * places it on the input queue of a internetwork datagram routine | |
19 | * and posts the associated software interrupt, or passes the datagram to a raw | |
20 | * packet input routine. | |
21 | * | |
ee787340 | 22 | * Routines exist for locating interfaces by their addresses |
f1b2fa5b BJ |
23 | * or for locating a interface on a certain network, as well as more general |
24 | * routing and gateway routines maintaining information used to locate | |
ee787340 | 25 | * interfaces. These routines live in the files if.c and route.c |
8a13b737 | 26 | */ |
8a13b737 BJ |
27 | |
28 | /* | |
29 | * Structure defining a queue for a network interface. | |
665ce890 BJ |
30 | * |
31 | * (Would like to call this struct ``if'', but C isn't PL/1.) | |
6187f8f4 SL |
32 | * |
33 | * EVENTUALLY PURGE if_net AND if_host FROM STRUCTURE | |
665ce890 BJ |
34 | */ |
35 | struct ifnet { | |
b454c3ea | 36 | char *if_name; /* name, e.g. ``en'' or ``lo'' */ |
665ce890 | 37 | short if_unit; /* sub-unit for lower level driver */ |
665ce890 | 38 | short if_mtu; /* maximum transmission unit */ |
6187f8f4 | 39 | int if_net; /* network number of interface */ |
ee787340 | 40 | short if_flags; /* up/down, broadcast, etc. */ |
de602274 | 41 | short if_timer; /* time 'til if_watchdog called */ |
8a13b737 | 42 | int if_host[2]; /* local net host number */ |
dc39362e BJ |
43 | struct sockaddr if_addr; /* address of interface */ |
44 | union { | |
45 | struct sockaddr ifu_broadaddr; | |
46 | struct sockaddr ifu_dstaddr; | |
47 | } if_ifu; | |
48 | #define if_broadaddr if_ifu.ifu_broadaddr /* broadcast address */ | |
49 | #define if_dstaddr if_ifu.ifu_dstaddr /* other end of p-to-p link */ | |
f1b2fa5b BJ |
50 | struct ifqueue { |
51 | struct mbuf *ifq_head; | |
52 | struct mbuf *ifq_tail; | |
1e977657 BJ |
53 | int ifq_len; |
54 | int ifq_maxlen; | |
55 | int ifq_drops; | |
f1b2fa5b BJ |
56 | } if_snd; /* output queue */ |
57 | /* procedure handles */ | |
58 | int (*if_init)(); /* init routine */ | |
8a13b737 | 59 | int (*if_output)(); /* output routine */ |
b3691eab | 60 | int (*if_reset)(); /* bus reset routine */ |
de602274 | 61 | int (*if_watchdog)(); /* timer routine */ |
f1b2fa5b | 62 | /* generic interface statistics */ |
b454c3ea BJ |
63 | int if_ipackets; /* packets received on interface */ |
64 | int if_ierrors; /* input errors on interface */ | |
65 | int if_opackets; /* packets sent on interface */ | |
66 | int if_oerrors; /* output errors on interface */ | |
f1b2fa5b | 67 | int if_collisions; /* collisions on csma interfaces */ |
f1b2fa5b | 68 | /* end statistics */ |
4ad99bae | 69 | struct ifnet *if_next; |
665ce890 BJ |
70 | }; |
71 | ||
ee787340 SL |
72 | #define IFF_UP 0x1 /* interface is up */ |
73 | #define IFF_BROADCAST 0x2 /* broadcast address valid */ | |
74 | #define IFF_DEBUG 0x4 /* turn on debugging */ | |
dc39362e BJ |
75 | #define IFF_ROUTE 0x8 /* routing entry installed */ |
76 | #define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */ | |
ee787340 | 77 | |
f1b2fa5b BJ |
78 | /* |
79 | * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1) | |
80 | * input routines have queues of messages stored on ifqueue structures | |
81 | * (defined above). Entries are added to and deleted from these structures | |
82 | * by these macros, which should be called with ipl raised to splimp(). | |
83 | */ | |
1e977657 BJ |
84 | #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) |
85 | #define IF_DROP(ifq) ((ifq)->ifq_drops++) | |
8a13b737 BJ |
86 | #define IF_ENQUEUE(ifq, m) { \ |
87 | (m)->m_act = 0; \ | |
88 | if ((ifq)->ifq_tail == 0) \ | |
405c9168 | 89 | (ifq)->ifq_head = m; \ |
8a13b737 BJ |
90 | else \ |
91 | (ifq)->ifq_tail->m_act = m; \ | |
405c9168 | 92 | (ifq)->ifq_tail = m; \ |
1e977657 | 93 | (ifq)->ifq_len++; \ |
8a13b737 | 94 | } |
e740a894 BJ |
95 | #define IF_PREPEND(ifq, m) { \ |
96 | (m)->m_act = (ifq)->ifq_head; \ | |
1dd55890 BJ |
97 | if ((ifq)->ifq_tail == 0) \ |
98 | (ifq)->ifq_tail = (m); \ | |
e740a894 | 99 | (ifq)->ifq_head = (m); \ |
1e977657 | 100 | (ifq)->ifq_len++; \ |
e740a894 | 101 | } |
8a13b737 BJ |
102 | #define IF_DEQUEUE(ifq, m) { \ |
103 | (m) = (ifq)->ifq_head; \ | |
104 | if (m) { \ | |
105 | if (((ifq)->ifq_head = (m)->m_act) == 0) \ | |
106 | (ifq)->ifq_tail = 0; \ | |
107 | (m)->m_act = 0; \ | |
1e977657 | 108 | (ifq)->ifq_len--; \ |
8a13b737 BJ |
109 | } \ |
110 | } | |
665ce890 | 111 | |
1e977657 | 112 | #define IFQ_MAXLEN 50 |
de602274 | 113 | #define IFNET_SLOWHZ 1 /* granularity is 1 second */ |
1e977657 | 114 | |
0c33c832 SL |
115 | /* |
116 | * Interface request structure used by socket | |
117 | * ioctl's SIOCSIFxxxx (set interface parameter) | |
118 | * and SIOCGIFxxxx (get parameter). | |
119 | */ | |
120 | struct ifreq { | |
121 | char ifr_name[16]; /* name of interface (e.g. "ec0") */ | |
122 | union { | |
123 | struct sockaddr ifru_addr; | |
124 | struct sockaddr ifru_dstaddr; | |
125 | short ifru_flags; | |
126 | } ifr_ifru; | |
127 | #define ifr_addr ifr_ifru.ifru_addr /* address */ | |
128 | #define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */ | |
129 | #define ifr_flags ifr_ifru.ifru_flags /* flags */ | |
130 | }; | |
131 | ||
132 | /* | |
133 | * Structure used in SIOCGIFCONF request. | |
134 | * Used to retrieve interface configuration | |
135 | * for machine (useful for programs which | |
136 | * must know all networks accessible). | |
137 | */ | |
138 | struct ifconf { | |
139 | int ifc_len; /* size of associated buffer */ | |
140 | union { | |
141 | caddr_t ifcu_buf; | |
142 | struct ifreq *ifcu_req; | |
143 | } ifc_ifcu; | |
144 | #define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */ | |
145 | #define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */ | |
146 | }; | |
147 | ||
665ce890 | 148 | #ifdef KERNEL |
8a13b737 BJ |
149 | #ifdef INET |
150 | struct ifqueue ipintrq; /* ip packet input queue */ | |
151 | #endif | |
ee787340 | 152 | struct ifqueue rawintrq; /* raw packet input queue */ |
665ce890 | 153 | struct ifnet *ifnet; |
ee787340 SL |
154 | struct ifnet *if_ifwithaddr(), *if_ifwithnet(), *if_ifwithaf(); |
155 | struct ifnet *if_ifonnetof(); | |
f1b2fa5b | 156 | struct in_addr if_makeaddr(); |
665ce890 | 157 | #endif |