1d389e50e0
so don't enforce the MTU as an MRU. Allow bidirectional ppp MTU negotiation, by checking against a differnt figure for MRU. Make it large enough for ATM frames at least. Submitted by: archie@whistle.com (archie cobbs)
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/* $NetBSD: if_tun.h,v 1.5 1994/06/29 06:36:27 cgd Exp $ */
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/*
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* Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
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* Nottingham University 1987.
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*
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* This source may be freely distributed, however I would be interested
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* in any changes that are made.
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*
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* This driver takes packets off the IP i/f and hands them up to a
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* user process to have it's wicked way with. This driver has it's
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* roots in a similar driver written by Phil Cockcroft (formerly) at
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* UCL. This driver is based much more on read/write/select mode of
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* operation though.
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*
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* : $Header: if_tnreg.h,v 1.1.2.1 1992/07/16 22:39:16 friedl Exp
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*/
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#ifndef _NET_IF_TUN_H_
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#define _NET_IF_TUN_H_
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struct tun_softc {
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u_short tun_flags; /* misc flags */
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#define TUN_OPEN 0x0001
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#define TUN_INITED 0x0002
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#define TUN_RCOLL 0x0004
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#define TUN_IASET 0x0008
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#define TUN_DSTADDR 0x0010
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#define TUN_RWAIT 0x0040
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#define TUN_ASYNC 0x0080
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#define TUN_NBIO 0x0100
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#define TUN_READY (TUN_OPEN | TUN_INITED)
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struct ifnet tun_if; /* the interface */
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int tun_pgrp; /* the process group - if any */
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struct selinfo tun_rsel; /* read select */
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struct selinfo tun_wsel; /* write select (not used) */
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};
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/* Maximum transmit packet size (default) */
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#define TUNMTU 1500
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/* Maximum receive packet size (hard limit) */
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#define TUNMRU 16384
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struct tuninfo {
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int baudrate; /* linespeed */
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short mtu; /* maximum transmission unit */
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u_char type; /* ethernet, tokenring, etc. */
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u_char dummy; /* place holder */
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};
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/* ioctl's for get/set debug */
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#define TUNSDEBUG _IOW('t', 90, int)
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#define TUNGDEBUG _IOR('t', 89, int)
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#define TUNSIFINFO _IOW('t', 91, struct tuninfo)
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#define TUNGIFINFO _IOR('t', 92, struct tuninfo)
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#endif /* !_NET_IF_TUN_H_ */
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