gre interface code, from NetBSD (with some changes)

1 files changed, 153 insertions, 0 deletions

diff --git a/sys/net/if_gre.h b/sys/net/if_gre.h
new file mode 100644
index 00000000000..c32e9423841
--- /dev/null
+++ b/sys/net/if_gre.h
@@ -0,0 +1,153 @@
+/*      $OpenBSD: if_gre.h,v 1.1 2000/01/07 21:37:30 angelos Exp $ */
+/*	$NetBSD: if_gre.h,v 1.5 1999/11/19 20:41:19 thorpej Exp $ */
+
+/*
+ * Copyright (c) 1998 The NetBSD Foundation, Inc.
+ * All rights reserved
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Heiko W.Rupp <hwr@pilhuhn.de>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *        This product includes software developed by the NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *    
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _NET_IF_GRE_H
+#define _NET_IF_GRE_H
+
+struct gre_softc {
+	struct ifnet sc_if;
+	int gre_unit;
+	int gre_flags;
+	struct    in_addr g_src;  /* source address of gre packets */
+	struct    in_addr g_dst;  /* destination address of gre packets */
+	caddr_t	gre_bpf;
+	struct route route;	/* routing entry that determines, where a
+                                   encapsulated packet should go */
+	u_char g_proto;		/* protocol of encapsulator */
+};	
+
+
+struct gre_h {
+	u_int16_t flags;	/* GRE flags */
+	u_int16_t ptype;	/* protocol type of payload typically 
+                               Ether protocol type*/
+/* 
+ *  from here on: fields are optional, presence indicated by flags 
+ *
+	u_int_16 checksum	 checksum (one-complements of GRE header
+                             and payload
+                             Present if (ck_pres | rt_pres == 1).
+                             Valid if (ck_pres == 1).
+	u_int_16 offset			 offset from start of routing filed to
+                             first octet of active SRE (see below).
+                             Present if (ck_pres | rt_pres == 1).
+                             Valid if (rt_pres == 1).
+	u_int_32 key         inserted by encapsulator e.g. for
+                             authentication
+                             Present if (key_pres ==1 ).
+	u_int_32 seq_num     Sequence number to allow for packet order
+                             Present if (seq_pres ==1 ).
+
+    struct gre_sre[] routing Routing fileds (see below)
+                             Present if (rt_pres == 1)
+*/
+} __attribute__((__packed__));
+
+struct greip {
+	struct ip gi_i;
+	struct gre_h  gi_g;
+} __attribute__((__packed__));
+
+#define gi_pr           gi_i.ip_p
+#define gi_len          gi_i.ip_len
+#define gi_src          gi_i.ip_src
+#define gi_dst          gi_i.ip_dst
+#define gi_ptype	gi_g.ptype
+#define gi_flags	gi_g.flags
+
+#define GRE_CP          0x8000  /* Checksum Present */
+#define GRE_RP          0x4000  /* Routing Present */
+#define GRE_KP          0x2000  /* Key Present */
+#define GRE_SP          0x1000  /* Sequence Present */
+#define GRE_SS		0x0800	/* Strict Source Route */
+
+/* gre_sre defines a Source route Entry. These are needed if packets
+ *  should be routed over more than one tunnel hop by hop
+ */
+
+struct gre_sre {
+	u_int16_t sre_family;	/* adress family */
+	u_char  sre_offset;	/* offset to first octet of active entry */
+	u_char  sre_length;	/* number of octets in the SRE. 
+                               sre_lengthl==0 -> last entry. */
+	u_char  *sre_rtinfo;	/* the routing information */
+};
+
+struct greioctl {
+	int unit;
+	struct    in_addr addr;
+};
+
+/* for mobile encaps */
+
+struct mobile_h {
+	u_int16_t proto;		/* protocol and S-bit */
+	u_int16_t hcrc;			/* header checksum */
+	u_int32_t odst;			/* original destination address */
+	u_int32_t osrc;			/* original source addr, if S-bit set */
+} __attribute__((__packed__));
+
+struct mobip_h {
+	struct ip       mi;
+	struct mobile_h mh;
+} __attribute__((__packed__));
+
+
+#define MOB_H_SIZ_S		(sizeof(struct mobile_h) - sizeof(u_int32_t))
+#define MOB_H_SIZ_L		(sizeof(struct mobile_h))
+#define MOB_H_SBIT	0x0080
+
+
+/* 
+ * ioctls needed to manipulate the interface 
+ */
+
+#ifdef _KERNEL
+extern	struct gre_softc gre_softc[];
+extern  int gre_allow;   
+extern  int ip_mobile_allow;
+
+void	greattach __P((void));
+int     gre_ioctl __P((struct ifnet *, u_long, caddr_t));
+int     gre_output __P((struct ifnet *, struct mbuf *, struct sockaddr *,
+	    struct rtentry *rt));
+u_short	gre_in_cksum(u_short *p, u_int len);
+#endif /* _KERNEL */
+
+#endif