This is the start of the BETA21 branch.

It includes the --topology feature, and
TAP-Win32 driver changes to allow
non-admin access.



git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@580 e7ae566f-a301-0410-adde-c780ea21d3b5

1 files changed, 163 insertions, 0 deletions

diff --git a/proto.h b/proto.h
new file mode 100644
index 0000000..440d3d1
--- /dev/null
+++ b/proto.h
@@ -0,0 +1,163 @@
+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single TCP/UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef PROTO_H
+#define PROTO_H
+
+#include "buffer.h"
+
+/*
+ * Tunnel types
+ */
+#define DEV_TYPE_UNDEF 0
+#define DEV_TYPE_NULL  1
+#define DEV_TYPE_TUN   2    /* point-to-point IP tunnel */
+#define DEV_TYPE_TAP   3    /* ethernet (802.3) tunnel */
+
+/*
+ * IP and Ethernet protocol structs.  For portability,
+ * OpenVPN needs its own definitions of these structs, and
+ * names have been adjusted to avoid collisions with
+ * native structs.
+ */
+
+#define OPENVPN_ETH_ALEN 6            /* ethernet address length */
+struct openvpn_ethhdr 
+{
+  uint8_t dest[OPENVPN_ETH_ALEN];     /* destination ethernet addr */
+  uint8_t source[OPENVPN_ETH_ALEN];   /* source ethernet addr	*/
+
+# define OPENVPN_ETH_P_IPV4   0x0800  /* IPv4 protocol */
+# define OPENVPN_ETH_P_IPV6   0x86DD  /* IPv6 protocol */
+# define OPENVPN_ETH_P_ARP    0x0806  /* ARP protocol */
+  uint16_t proto;                     /* packet type ID field */
+};
+
+struct openvpn_iphdr {
+# define OPENVPN_IPH_GET_VER(v) (((v) >> 4) & 0x0F)
+# define OPENVPN_IPH_GET_LEN(v) (((v) & 0x0F) << 2)
+  uint8_t    version_len;
+
+  uint8_t    tos;
+  uint16_t   tot_len;
+  uint16_t   id;
+
+# define OPENVPN_IP_OFFMASK 0x1fff
+  uint16_t   frag_off;
+
+  uint8_t    ttl;
+
+# define OPENVPN_IPPROTO_IGMP 2 /* IGMP protocol */
+# define OPENVPN_IPPROTO_TCP  6 /* TCP protocol */
+# define OPENVPN_IPPROTO_UDP 17 /* UDP protocol */
+  uint8_t    protocol;
+
+  uint16_t   check;
+  uint32_t   saddr;
+  uint32_t   daddr;
+  /*The options start here. */
+};
+
+/*
+ * UDP header
+ */
+struct openvpn_udphdr {
+  uint16_t   source;
+  uint16_t   dest;
+  uint16_t   len;
+  uint16_t   check;
+};
+
+/*
+ * TCP header, per RFC 793.
+ */
+struct openvpn_tcphdr {
+  uint16_t      source;    /* source port */
+  uint16_t      dest;      /* destination port */
+  uint32_t      seq;       /* sequence number */
+  uint32_t      ack_seq;   /* acknowledgement number */
+
+# define OPENVPN_TCPH_GET_DOFF(d) (((d) & 0xF0) >> 2)
+  uint8_t       doff_res;
+
+# define OPENVPN_TCPH_FIN_MASK (1<<0)
+# define OPENVPN_TCPH_SYN_MASK (1<<1)
+# define OPENVPN_TCPH_RST_MASK (1<<2)
+# define OPENVPN_TCPH_PSH_MASK (1<<3)
+# define OPENVPN_TCPH_ACK_MASK (1<<4)
+# define OPENVPN_TCPH_URG_MASK (1<<5)
+# define OPENVPN_TCPH_ECE_MASK (1<<6)
+# define OPENVPN_TCPH_CWR_MASK (1<<7)
+  uint8_t       flags;
+
+  uint16_t      window;
+  uint16_t      check;
+  uint16_t      urg_ptr;
+};
+
+#define	OPENVPN_TCPOPT_EOL     0
+#define	OPENVPN_TCPOPT_NOP     1
+#define	OPENVPN_TCPOPT_MAXSEG  2
+#define OPENVPN_TCPOLEN_MAXSEG 4
+
+/*
+ * The following macro is used to update an
+ * internet checksum.  "acc" is a 32-bit
+ * accumulation of all the changes to the
+ * checksum (adding in old 16-bit words and
+ * subtracting out new words), and "cksum"
+ * is the checksum value to be updated.
+ */
+#define ADJUST_CHECKSUM(acc, cksum) { \
+  (acc) += (cksum); \
+  if ((acc) < 0) { \
+    (acc) = -(acc); \
+    (acc) = ((acc) >> 16) + ((acc) & 0xffff); \
+    (acc) += (acc) >> 16; \
+    (cksum) = (uint16_t) ~(acc); \
+  } else { \
+    (acc) = ((acc) >> 16) + ((acc) & 0xffff); \
+    (acc) += (acc) >> 16; \
+    (cksum) = (uint16_t) (acc); \
+  } \
+}
+
+/*
+ * We are in a "liberal" position with respect to MSS,
+ * i.e. we assume that MSS can be calculated from MTU
+ * by subtracting out only the IP and TCP header sizes
+ * without options.
+ *
+ * (RFC 879, section 7).
+ */
+#define MTU_TO_MSS(mtu) (mtu - sizeof(struct openvpn_iphdr) \
+                             - sizeof(struct openvpn_tcphdr))
+
+/*
+ * If raw tunnel packet is IPv4, return true and increment
+ * buffer offset to start of IP header.
+ */
+bool is_ipv4 (int tunnel_type, struct buffer *buf);
+
+#endif