1 /*- 2 * Copyright (c) 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)slip.h 8.1 (Berkeley) 02/12/94 8 */ 9 10 /* Ioctls operating on SLIP ttys. */ 11 #define SLIOCGUNIT _IOR('t', 88, int) /* get slip unit number */ 12 13 /* 14 * Definitions of the pseudo-link-level header attached to slip 15 * packets grabbed by the packet filter (bpf) traffic monitor. 16 */ 17 #define SLIP_HDRLEN 16 /* BPF SLIP header length */ 18 19 /* Offsets into BPF SLIP header. */ 20 #define SLX_DIR 0 /* direction; see below */ 21 #define SLX_CHDR 1 /* compressed header data */ 22 #define CHDR_LEN 15 /* length of compressed header data */ 23 24 #define SLIPDIR_IN 0 /* incoming */ 25 #define SLIPDIR_OUT 1 /* outgoing */ 26