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1.1 root 1: /* if.h 6.2 83/08/28 */
2:
3: /*
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:
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.
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: *
22: * Routines exist for locating interfaces by their addresses
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
25: * interfaces. These routines live in the files if.c and route.c
26: */
27:
28: /*
29: * Structure defining a queue for a network interface.
30: *
31: * (Would like to call this struct ``if'', but C isn't PL/1.)
32: *
33: * EVENTUALLY PURGE if_net AND if_host FROM STRUCTURE
34: */
35: struct ifnet {
36: char *if_name; /* name, e.g. ``en'' or ``lo'' */
37: short if_unit; /* sub-unit for lower level driver */
38: short if_mtu; /* maximum transmission unit */
39: int if_net; /* network number of interface */
40: short if_flags; /* up/down, broadcast, etc. */
41: short if_timer; /* time 'til if_watchdog called */
42: int if_host[2]; /* local net host number */
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 */
50: struct ifqueue {
51: struct mbuf *ifq_head;
52: struct mbuf *ifq_tail;
53: int ifq_len;
54: int ifq_maxlen;
55: int ifq_drops;
56: } if_snd; /* output queue */
57: /* procedure handles */
58: int (*if_init)(); /* init routine */
59: int (*if_output)(); /* output routine */
60: int (*if_ioctl)(); /* ioctl routine */
61: int (*if_reset)(); /* bus reset routine */
62: int (*if_watchdog)(); /* timer routine */
63: /* generic interface statistics */
64: int if_ipackets; /* packets received on interface */
65: int if_ierrors; /* input errors on interface */
66: int if_opackets; /* packets sent on interface */
67: int if_oerrors; /* output errors on interface */
68: int if_collisions; /* collisions on csma interfaces */
69: /* end statistics */
70: struct ifnet *if_next;
71: };
72:
73: #define IFF_UP 0x1 /* interface is up */
74: #define IFF_BROADCAST 0x2 /* broadcast address valid */
75: #define IFF_DEBUG 0x4 /* turn on debugging */
76: #define IFF_ROUTE 0x8 /* routing entry installed */
77: #define IFF_POINTOPOINT 0x10 /* interface is point-to-point link */
78: #define IFF_NOTRAILERS 0x20 /* avoid use of trailers */
79: #define IFF_RUNNING 0x40 /* resources allocated */
80: #define IFF_NOARP 0x80 /* no address resolution protocol */
81:
82: /*
83: * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1)
84: * input routines have queues of messages stored on ifqueue structures
85: * (defined above). Entries are added to and deleted from these structures
86: * by these macros, which should be called with ipl raised to splimp().
87: */
88: #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
89: #define IF_DROP(ifq) ((ifq)->ifq_drops++)
90: #define IF_ENQUEUE(ifq, m) { \
91: (m)->m_act = 0; \
92: if ((ifq)->ifq_tail == 0) \
93: (ifq)->ifq_head = m; \
94: else \
95: (ifq)->ifq_tail->m_act = m; \
96: (ifq)->ifq_tail = m; \
97: (ifq)->ifq_len++; \
98: }
99: #define IF_PREPEND(ifq, m) { \
100: (m)->m_act = (ifq)->ifq_head; \
101: if ((ifq)->ifq_tail == 0) \
102: (ifq)->ifq_tail = (m); \
103: (ifq)->ifq_head = (m); \
104: (ifq)->ifq_len++; \
105: }
106: #define IF_DEQUEUE(ifq, m) { \
107: (m) = (ifq)->ifq_head; \
108: if (m) { \
109: if (((ifq)->ifq_head = (m)->m_act) == 0) \
110: (ifq)->ifq_tail = 0; \
111: (m)->m_act = 0; \
112: (ifq)->ifq_len--; \
113: } \
114: }
115:
116: #define IFQ_MAXLEN 50
117: #define IFNET_SLOWHZ 1 /* granularity is 1 second */
118:
119: /*
120: * Interface request structure used for socket
121: * ioctl's. All interface ioctl's must have parameter
122: * definitions which begin with ifr_name. The
123: * remainder may be interface specific.
124: */
125: struct ifreq {
126: #define IFNAMSIZ 16
127: char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */
128: union {
129: struct sockaddr ifru_addr;
130: struct sockaddr ifru_dstaddr;
131: short ifru_flags;
132: caddr_t ifru_data;
133: } ifr_ifru;
134: #define ifr_addr ifr_ifru.ifru_addr /* address */
135: #define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */
136: #define ifr_flags ifr_ifru.ifru_flags /* flags */
137: #define ifr_data ifr_ifru.ifru_data /* for use by interface */
138: };
139:
140: /*
141: * Structure used in SIOCGIFCONF request.
142: * Used to retrieve interface configuration
143: * for machine (useful for programs which
144: * must know all networks accessible).
145: */
146: struct ifconf {
147: int ifc_len; /* size of associated buffer */
148: union {
149: caddr_t ifcu_buf;
150: struct ifreq *ifcu_req;
151: } ifc_ifcu;
152: #define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */
153: #define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */
154: };
155:
156: #ifdef KERNEL
157: #ifdef INET
158: struct ifqueue ipintrq; /* ip packet input queue */
159: #endif
160: struct ifqueue rawintrq; /* raw packet input queue */
161: struct ifnet *ifnet;
162: struct ifnet *if_ifwithaddr(), *if_ifwithnet(), *if_ifwithaf();
163: struct ifnet *if_ifonnetof();
164: struct in_addr if_makeaddr();
165: #endif
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