Annotation of sys/net/if_gre.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: if_gre.h,v 1.10 2005/05/14 19:24:23 brad Exp $ */
! 2: /* $NetBSD: if_gre.h,v 1.5 1999/11/19 20:41:19 thorpej Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1998 The NetBSD Foundation, Inc.
! 6: * All rights reserved
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by Heiko W.Rupp <hwr@pilhuhn.de>
! 10: *
! 11: * Redistribution and use in source and binary forms, with or without
! 12: * modification, are permitted provided that the following conditions
! 13: * are met:
! 14: * 1. Redistributions of source code must retain the above copyright
! 15: * notice, this list of conditions and the following disclaimer.
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: * 3. All advertising materials mentioning features or use of this software
! 20: * must display the following acknowledgement:
! 21: * This product includes software developed by the NetBSD
! 22: * Foundation, Inc. and its contributors.
! 23: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 24: * contributors may be used to endorse or promote products derived
! 25: * from this software without specific prior written permission.
! 26: *
! 27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 31: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 37: * POSSIBILITY OF SUCH DAMAGE.
! 38: */
! 39:
! 40: #ifndef _NET_IF_GRE_H
! 41: #define _NET_IF_GRE_H
! 42:
! 43: struct gre_softc {
! 44: struct ifnet sc_if;
! 45: LIST_ENTRY(gre_softc) sc_list;
! 46: int gre_unit;
! 47: int gre_flags;
! 48: struct in_addr g_src; /* source address of gre packets */
! 49: struct in_addr g_dst; /* destination address of gre packets */
! 50: struct route route; /* routing entry that determines, where a
! 51: encapsulated packet should go */
! 52: u_char g_proto; /* protocol of encapsulator */
! 53: };
! 54:
! 55:
! 56: struct gre_h {
! 57: u_int16_t flags; /* GRE flags */
! 58: u_int16_t ptype; /* protocol type of payload typically
! 59: Ether protocol type*/
! 60: /*
! 61: * from here on: fields are optional, presence indicated by flags
! 62: *
! 63: u_int_16 checksum checksum (one-complements of GRE header
! 64: and payload
! 65: Present if (ck_pres | rt_pres == 1).
! 66: Valid if (ck_pres == 1).
! 67: u_int_16 offset offset from start of routing filed to
! 68: first octet of active SRE (see below).
! 69: Present if (ck_pres | rt_pres == 1).
! 70: Valid if (rt_pres == 1).
! 71: u_int_32 key inserted by encapsulator e.g. for
! 72: authentication
! 73: Present if (key_pres ==1 ).
! 74: u_int_32 seq_num Sequence number to allow for packet order
! 75: Present if (seq_pres ==1 ).
! 76:
! 77: struct gre_sre[] routing Routing fileds (see below)
! 78: Present if (rt_pres == 1)
! 79: */
! 80: } __packed;
! 81:
! 82: struct greip {
! 83: struct ip gi_i;
! 84: struct gre_h gi_g;
! 85: } __packed;
! 86:
! 87: #define gi_pr gi_i.ip_p
! 88: #define gi_len gi_i.ip_len
! 89: #define gi_src gi_i.ip_src
! 90: #define gi_dst gi_i.ip_dst
! 91: #define gi_ptype gi_g.ptype
! 92: #define gi_flags gi_g.flags
! 93:
! 94: #define GRE_CP 0x8000 /* Checksum Present */
! 95: #define GRE_RP 0x4000 /* Routing Present */
! 96: #define GRE_KP 0x2000 /* Key Present */
! 97: #define GRE_SP 0x1000 /* Sequence Present */
! 98: #define GRE_SS 0x0800 /* Strict Source Route */
! 99:
! 100: /* gre_sre defines a Source route Entry. These are needed if packets
! 101: * should be routed over more than one tunnel hop by hop
! 102: */
! 103:
! 104: struct gre_sre {
! 105: u_int16_t sre_family; /* address family */
! 106: u_char sre_offset; /* offset to first octet of active entry */
! 107: u_char sre_length; /* number of octets in the SRE.
! 108: sre_lengthl==0 -> last entry. */
! 109: u_char *sre_rtinfo; /* the routing information */
! 110: };
! 111:
! 112: struct greioctl {
! 113: int unit;
! 114: struct in_addr addr;
! 115: };
! 116:
! 117: /* for mobile encaps */
! 118:
! 119: struct mobile_h {
! 120: u_int16_t proto; /* protocol and S-bit */
! 121: u_int16_t hcrc; /* header checksum */
! 122: u_int32_t odst; /* original destination address */
! 123: u_int32_t osrc; /* original source addr, if S-bit set */
! 124: } __packed;
! 125:
! 126: struct mobip_h {
! 127: struct ip mi;
! 128: struct mobile_h mh;
! 129: } __packed;
! 130:
! 131:
! 132: #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t))
! 133: #define MOB_H_SIZ_L (sizeof(struct mobile_h))
! 134: #define MOB_H_SBIT 0x0080
! 135:
! 136:
! 137: /*
! 138: * ioctls needed to manipulate the interface
! 139: */
! 140:
! 141: #ifdef _KERNEL
! 142: extern LIST_HEAD(gre_softc_head, gre_softc) gre_softc_list;
! 143: extern int gre_allow;
! 144: extern int gre_wccp;
! 145: extern int ip_mobile_allow;
! 146:
! 147: void greattach(int);
! 148: int gre_ioctl(struct ifnet *, u_long, caddr_t);
! 149: int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *,
! 150: struct rtentry *);
! 151: u_int16_t gre_in_cksum(u_int16_t *, u_int);
! 152: #endif /* _KERNEL */
! 153: #endif /* _NET_IF_GRE_H_ */
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