Commit | Line | Data |
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f6311fb6 | 1 | /* if.h 4.12 82/03/30 */ |
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.) | |
32 | */ | |
33 | struct ifnet { | |
b454c3ea | 34 | char *if_name; /* name, e.g. ``en'' or ``lo'' */ |
665ce890 | 35 | short if_unit; /* sub-unit for lower level driver */ |
665ce890 BJ |
36 | short if_mtu; /* maximum transmission unit */ |
37 | short if_net; /* network number of interface */ | |
ee787340 | 38 | short if_flags; /* up/down, broadcast, etc. */ |
8a13b737 | 39 | int if_host[2]; /* local net host number */ |
ee787340 SL |
40 | struct sockaddr if_addr; /* internet address of interface */ |
41 | struct sockaddr if_broadaddr; /* broadcast address of interface */ | |
f1b2fa5b BJ |
42 | struct ifqueue { |
43 | struct mbuf *ifq_head; | |
44 | struct mbuf *ifq_tail; | |
1e977657 BJ |
45 | int ifq_len; |
46 | int ifq_maxlen; | |
47 | int ifq_drops; | |
f1b2fa5b BJ |
48 | } if_snd; /* output queue */ |
49 | /* procedure handles */ | |
50 | int (*if_init)(); /* init routine */ | |
8a13b737 BJ |
51 | int (*if_output)(); /* output routine */ |
52 | int (*if_ubareset)(); /* uba reset routine */ | |
f1b2fa5b | 53 | /* generic interface statistics */ |
b454c3ea BJ |
54 | int if_ipackets; /* packets received on interface */ |
55 | int if_ierrors; /* input errors on interface */ | |
56 | int if_opackets; /* packets sent on interface */ | |
57 | int if_oerrors; /* output errors on interface */ | |
f1b2fa5b | 58 | int if_collisions; /* collisions on csma interfaces */ |
f1b2fa5b | 59 | /* end statistics */ |
4ad99bae | 60 | struct ifnet *if_next; |
665ce890 BJ |
61 | }; |
62 | ||
ee787340 SL |
63 | #define IFF_UP 0x1 /* interface is up */ |
64 | #define IFF_BROADCAST 0x2 /* broadcast address valid */ | |
65 | #define IFF_DEBUG 0x4 /* turn on debugging */ | |
f6311fb6 | 66 | #define IFF_ROUTE 0x8 /* routine entry installed */ |
ee787340 | 67 | |
f1b2fa5b BJ |
68 | /* |
69 | * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1) | |
70 | * input routines have queues of messages stored on ifqueue structures | |
71 | * (defined above). Entries are added to and deleted from these structures | |
72 | * by these macros, which should be called with ipl raised to splimp(). | |
73 | */ | |
1e977657 BJ |
74 | #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) |
75 | #define IF_DROP(ifq) ((ifq)->ifq_drops++) | |
8a13b737 BJ |
76 | #define IF_ENQUEUE(ifq, m) { \ |
77 | (m)->m_act = 0; \ | |
78 | if ((ifq)->ifq_tail == 0) \ | |
405c9168 | 79 | (ifq)->ifq_head = m; \ |
8a13b737 BJ |
80 | else \ |
81 | (ifq)->ifq_tail->m_act = m; \ | |
405c9168 | 82 | (ifq)->ifq_tail = m; \ |
1e977657 | 83 | (ifq)->ifq_len++; \ |
8a13b737 | 84 | } |
e740a894 BJ |
85 | #define IF_PREPEND(ifq, m) { \ |
86 | (m)->m_act = (ifq)->ifq_head; \ | |
1dd55890 BJ |
87 | if ((ifq)->ifq_tail == 0) \ |
88 | (ifq)->ifq_tail = (m); \ | |
e740a894 | 89 | (ifq)->ifq_head = (m); \ |
1e977657 | 90 | (ifq)->ifq_len++; \ |
e740a894 | 91 | } |
8a13b737 BJ |
92 | #define IF_DEQUEUE(ifq, m) { \ |
93 | (m) = (ifq)->ifq_head; \ | |
94 | if (m) { \ | |
95 | if (((ifq)->ifq_head = (m)->m_act) == 0) \ | |
96 | (ifq)->ifq_tail = 0; \ | |
97 | (m)->m_act = 0; \ | |
1e977657 | 98 | (ifq)->ifq_len--; \ |
8a13b737 BJ |
99 | } \ |
100 | } | |
665ce890 | 101 | |
1e977657 BJ |
102 | #define IFQ_MAXLEN 50 |
103 | ||
665ce890 | 104 | #ifdef KERNEL |
8a13b737 BJ |
105 | #ifdef INET |
106 | struct ifqueue ipintrq; /* ip packet input queue */ | |
107 | #endif | |
ee787340 | 108 | struct ifqueue rawintrq; /* raw packet input queue */ |
665ce890 | 109 | struct ifnet *ifnet; |
ee787340 SL |
110 | struct ifnet *if_ifwithaddr(), *if_ifwithnet(), *if_ifwithaf(); |
111 | struct ifnet *if_ifonnetof(); | |
f1b2fa5b | 112 | struct in_addr if_makeaddr(); |
665ce890 | 113 | #endif |