mirror of
https://codeberg.org/ziglang/zig.git
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Alex Rønne Petersen
66d97267c7
This excludes all headers in /usr/include/dev because that directory is bonkers huge (18M). We can add these on an as-needed basis.
122 lines
4.0 KiB
C
Vendored
122 lines
4.0 KiB
C
Vendored
/* $OpenBSD: if_tun.h,v 1.18 2024/11/17 00:25:07 dlg Exp $ */
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/*
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* Copyright (c) 1988, Julian Onions <Julian.Onions@nexor.co.uk>
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* Nottingham University 1987.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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#include <sys/ioccom.h>
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/*
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* tun_hdr is a multiple of 4 bytes, but is built out of uint16_t
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* fields. This allows it to sit on a 2 byte boundary in front of
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* either IP (and MPLS) or Ethernet packets for tun(4) and tap(4)
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* interfaces respectively while maintaining the alignment of their
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* payloads.
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*
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* Userland can request the use of the tun_hdr using the TUNSCAP
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* ioctl. This ioctl also allows userland to specify which "offload"
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* capabilities it is able to accept in packets it will read from the
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* kernel. It is acceptable to enable tun_hdr without enabling any
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* interface offload capabilities.
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*
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* Once the tap_hdr is enabled, userland can write packets into the
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* kernel with any of the supported features. tun(4)/tap(4) reads
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* will unconditionally handle any features specified on the packet,
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* regardless of what capabilities were specified by the TUNSCAP
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* ioctl.
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*
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* The tun_hdr can be read from one interface and written directly
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* to another without interpretation or modification.
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*
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* Use of tun_hdr and the associated capabilities are reset when a
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* tun(4)/tap(4) device is closed.
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*/
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struct tun_hdr {
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uint16_t th_flags;
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#define TUN_H_PRIO_MASK 0x7
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#define TUN_H_VTAG (1 << 4) /* th_vtag is set */
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#define TUN_H_TCP_MSS (1 << 5) /* Cut TCP frame up by th_mss */
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#define TUN_H_IPV4_CSUM (1 << 8)
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#define TUN_H_TCP_CSUM (1 << 9)
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#define TUN_H_UDP_CSUM (1 << 10)
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#define TUN_H_ICMP_CSUM (1 << 11)
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uint16_t th_pad;
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uint16_t th_vtag;
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uint16_t th_mss;
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};
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#define TUN_OPEN 0x0001
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#define TUN_INITED 0x0002
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#define TUN_RCOLL 0x0004 /* unused */
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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_BRDADDR 0x0200
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#define TUN_STAYUP 0x0400
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#define TUN_LAYER2 0x0800
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#define TUN_READY (TUN_OPEN | TUN_INITED)
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/* Maximum packet size */
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#define TUNMTU 3000
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/* Maximum receive packet size (hard limit) */
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#define TUNMRU 16384
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/* iface info */
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struct tuninfo {
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u_int mtu;
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u_short type;
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u_short flags;
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u_int baudrate;
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};
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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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/* ioctl for changing the broadcast/point-to-point status */
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#define TUNSIFMODE _IOW('t', 93, int)
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/* ioctl's for get/set debug */
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#define TUNSDEBUG _IOW('t', 94, int)
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#define TUNGDEBUG _IOR('t', 95, int)
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struct tun_capabilities {
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uint32_t tun_if_capabilities; /* IFCAP_* from net/if.h */
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};
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#define TUNSCAP _IOW('t', 196, struct tun_capabilities)
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#define TUNGCAP _IOR('t', 196, struct tun_capabilities)
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#define TUNDCAP _IO('t', 196)
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#endif /* _NET_IF_TUN_H_ */ |