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29 * @(#)if_dl.h 8.1 (Berkeley) 6/10/93
37 * A Link-Level Sockaddr may specify the interface in one of two
38 * ways: either by means of a system-provided index number (computed
39 * anew and possibly differently on every reboot), or by a human-readable
40 * string such as "il0" (for managerial convenience).
42 * Census taking actions, such as something akin to SIOCGCONF would return
43 * both the index and the human name.
45 * High volume transactions (such as giving a link-level ``from'' address
46 * in a recvfrom or recvmsg call) may be likely only to provide the indexed
47 * form, (which requires fewer copy operations and less space).
49 * The form and interpretation of the link-level address is purely a matter
50 * of convention between the device driver and its consumers; however, it is
51 * expected that all drivers for an interface of a given if_type will agree.
55 * Structure of a Link-Level sockaddr:
58 u_char sdl_len; /* Total length of sockaddr */
59 u_char sdl_family; /* AF_LINK */
60 u_short sdl_index; /* if != 0, system given index for interface */
61 u_char sdl_type; /* interface type */
62 u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
63 u_char sdl_alen; /* link level address length */
64 u_char sdl_slen; /* link layer selector length */
65 char sdl_data[46]; /* minimum work area, can be larger;
66 contains both if name and ll address */
69 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
73 #include <sys/cdefs.h>
76 void link_addr(const char *, struct sockaddr_dl *);
77 char *link_ntoa(const struct sockaddr_dl *);