Imported Upstream version 2.3_rc1

1 files changed, 471 insertions, 0 deletions

diff --git a/src/openvpn/tun.h b/src/openvpn/tun.h
new file mode 100644
index 0000000..8622bf8
--- /dev/null
+++ b/src/openvpn/tun.h
@@ -0,0 +1,471 @@
+/*
+ *  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) 2002-2010 OpenVPN Technologies, Inc. <sales@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 TUN_H
+#define TUN_H
+
+#ifdef WIN32
+#include <winioctl.h>
+#include <tap-windows.h>
+#endif
+
+#include "buffer.h"
+#include "error.h"
+#include "mtu.h"
+#include "win32.h"
+#include "event.h"
+#include "proto.h"
+#include "misc.h"
+
+#ifdef WIN32
+
+#define TUN_ADAPTER_INDEX_INVALID ((DWORD)-1)
+
+/* time constants for --ip-win32 adaptive */
+#define IPW32_SET_ADAPTIVE_DELAY_WINDOW 300
+#define IPW32_SET_ADAPTIVE_TRY_NETSH    20
+
+struct tuntap_options {
+  /* --ip-win32 options */
+  bool ip_win32_defined;
+
+# define IPW32_SET_MANUAL       0  /* "--ip-win32 manual" */
+# define IPW32_SET_NETSH        1  /* "--ip-win32 netsh" */
+# define IPW32_SET_IPAPI        2  /* "--ip-win32 ipapi" */
+# define IPW32_SET_DHCP_MASQ    3  /* "--ip-win32 dynamic" */
+# define IPW32_SET_ADAPTIVE     4  /* "--ip-win32 adaptive" */
+# define IPW32_SET_N            5
+  int ip_win32_type;
+
+  /* --ip-win32 dynamic options */
+  bool dhcp_masq_custom_offset;
+  int dhcp_masq_offset;
+  int dhcp_lease_time;
+
+  /* --tap-sleep option */
+  int tap_sleep;
+
+  /* --dhcp-option options */
+
+  bool dhcp_options;
+
+  const char *domain;        /* DOMAIN (15) */
+
+  const char *netbios_scope; /* NBS (47) */
+
+  int netbios_node_type;     /* NBT 1,2,4,8 (46) */
+
+#define N_DHCP_ADDR 4        /* Max # of addresses allowed for
+			        DNS, WINS, etc. */
+
+  /* DNS (6) */
+  in_addr_t dns[N_DHCP_ADDR];
+  int dns_len;
+
+  /* WINS (44) */
+  in_addr_t wins[N_DHCP_ADDR];
+  int wins_len;
+
+  /* NTP (42) */
+  in_addr_t ntp[N_DHCP_ADDR];
+  int ntp_len;
+
+  /* NBDD (45) */
+  in_addr_t nbdd[N_DHCP_ADDR];
+  int nbdd_len;
+
+  /* DISABLE_NBT (43, Vendor option 001) */
+  bool disable_nbt;
+
+  bool dhcp_renew;
+  bool dhcp_pre_release;
+  bool dhcp_release;
+
+  bool register_dns;
+};
+
+#elif TARGET_LINUX
+
+struct tuntap_options {
+  int txqueuelen;
+};
+
+#else
+
+struct tuntap_options {
+  int dummy; /* not used */
+};
+
+#endif
+
+/*
+ * Define a TUN/TAP dev.
+ */
+
+struct tuntap
+{
+# define TUNNEL_TYPE(tt) ((tt) ? ((tt)->type) : DEV_TYPE_UNDEF)
+  int type; /* DEV_TYPE_x as defined in proto.h */
+
+# define TUNNEL_TOPOLOGY(tt) ((tt) ? ((tt)->topology) : TOP_UNDEF)
+  int topology; /* one of the TOP_x values */
+
+  bool did_ifconfig_setup;
+  bool did_ifconfig_ipv6_setup;
+  bool did_ifconfig;
+
+  bool ipv6;
+
+  bool persistent_if;		/* if existed before, keep on program end */
+
+  struct tuntap_options options; /* options set on command line */
+
+  char *actual_name; /* actual name of TUN/TAP dev, usually including unit number */
+
+  /* number of TX buffers */
+  int txqueuelen;
+
+  /* ifconfig parameters */
+  in_addr_t local;
+  in_addr_t remote_netmask;
+  in_addr_t broadcast;
+
+  struct in6_addr local_ipv6;
+  struct in6_addr remote_ipv6;
+  int netbits_ipv6;
+
+#ifdef WIN32
+  HANDLE hand;
+  struct overlapped_io reads;
+  struct overlapped_io writes;
+  struct rw_handle rw_handle;
+
+  /* used for setting interface address via IP Helper API
+     or DHCP masquerade */
+  bool ipapi_context_defined;
+  ULONG ipapi_context;
+  ULONG ipapi_instance;
+  in_addr_t adapter_netmask;
+
+  /* Windows adapter index for TAP-Windows adapter,
+     ~0 if undefined */
+  DWORD adapter_index;
+
+  int standby_iter;
+#else
+  int fd;   /* file descriptor for TUN/TAP dev */
+#endif
+
+#ifdef TARGET_SOLARIS
+  int ip_fd;
+#endif
+
+  /* used for printing status info only */
+  unsigned int rwflags_debug;
+
+  /* Some TUN/TAP drivers like to be ioctled for mtu
+     after open */
+  int post_open_mtu;
+};
+
+static inline bool
+tuntap_defined (const struct tuntap *tt)
+{
+#ifdef WIN32
+  return tt && tt->hand != NULL;
+#else
+  return tt && tt->fd >= 0;
+#endif
+}
+
+/*
+ * Function prototypes
+ */
+
+static void clear_tuntap (struct tuntap *tuntap);
+
+void open_tun (const char *dev, const char *dev_type, const char *dev_node,
+	       struct tuntap *tt);
+
+void close_tun (struct tuntap *tt);
+
+int write_tun (struct tuntap* tt, uint8_t *buf, int len);
+
+int read_tun (struct tuntap* tt, uint8_t *buf, int len);
+
+void tuncfg (const char *dev, const char *dev_type, const char *dev_node,
+	     int persist_mode, const char *username,
+	     const char *groupname, const struct tuntap_options *options);
+
+const char *guess_tuntap_dev (const char *dev,
+			      const char *dev_type,
+			      const char *dev_node,
+			      struct gc_arena *gc);
+
+struct tuntap *init_tun (const char *dev,       /* --dev option */
+			 const char *dev_type,  /* --dev-type option */
+			 int topology,          /* one of the TOP_x values */
+			 const char *ifconfig_local_parm,          /* --ifconfig parm 1 */
+			 const char *ifconfig_remote_netmask_parm, /* --ifconfig parm 2 */
+			 const char *ifconfig_ipv6_local_parm,     /* --ifconfig parm 1 / IPv6 */
+			 int ifconfig_ipv6_netbits_parm,           /* --ifconfig parm 1 / bits */
+			 const char *ifconfig_ipv6_remote_parm,    /* --ifconfig parm 2 / IPv6 */
+			 in_addr_t local_public,
+			 in_addr_t remote_public,
+			 const bool strict_warn,
+			 struct env_set *es);
+
+void init_tun_post (struct tuntap *tt,
+		    const struct frame *frame,
+		    const struct tuntap_options *options);
+
+void do_ifconfig (struct tuntap *tt,
+		  const char *actual,    /* actual device name */
+		  int tun_mtu,
+		  const struct env_set *es);
+
+bool is_dev_type (const char *dev, const char *dev_type, const char *match_type);
+int dev_type_enum (const char *dev, const char *dev_type);
+const char *dev_type_string (const char *dev, const char *dev_type);
+
+const char *ifconfig_options_string (const struct tuntap* tt, bool remote, bool disable, struct gc_arena *gc);
+
+bool is_tun_p2p (const struct tuntap *tt);
+
+void check_subnet_conflict (const in_addr_t ip,
+			    const in_addr_t netmask,
+			    const char *prefix);
+
+void warn_on_use_of_common_subnets (void);
+
+/*
+ * Inline functions
+ */
+
+static inline void
+tun_adjust_frame_parameters (struct frame* frame, int size)
+{
+  frame_add_to_extra_tun (frame, size);
+}
+
+/*
+ * Should ifconfig be called before or after
+ * tun dev open?
+ */
+
+#define IFCONFIG_BEFORE_TUN_OPEN 0
+#define IFCONFIG_AFTER_TUN_OPEN  1
+
+#define IFCONFIG_DEFAULT         IFCONFIG_AFTER_TUN_OPEN
+
+static inline int
+ifconfig_order(void)
+{
+#if defined(TARGET_LINUX)
+  return IFCONFIG_AFTER_TUN_OPEN;
+#elif defined(TARGET_SOLARIS)
+  return IFCONFIG_AFTER_TUN_OPEN;
+#elif defined(TARGET_OPENBSD)
+  return IFCONFIG_AFTER_TUN_OPEN;
+#elif defined(TARGET_DARWIN)
+  return IFCONFIG_AFTER_TUN_OPEN;
+#elif defined(TARGET_NETBSD)
+  return IFCONFIG_AFTER_TUN_OPEN;
+#elif defined(WIN32)
+  return IFCONFIG_BEFORE_TUN_OPEN;
+#else
+  return IFCONFIG_DEFAULT;
+#endif
+}
+
+#ifdef WIN32
+
+#define TUN_PASS_BUFFER
+
+struct tap_reg
+{
+  const char *guid;
+  struct tap_reg *next;
+};
+
+struct panel_reg
+{
+  const char *name;
+  const char *guid;
+  struct panel_reg *next;
+};
+
+int ascii2ipset (const char* name);
+const char *ipset2ascii (int index);
+const char *ipset2ascii_all (struct gc_arena *gc);
+
+void verify_255_255_255_252 (in_addr_t local, in_addr_t remote);
+
+const IP_ADAPTER_INFO *get_adapter_info_list (struct gc_arena *gc);
+const IP_ADAPTER_INFO *get_tun_adapter (const struct tuntap *tt, const IP_ADAPTER_INFO *list);
+
+const IP_ADAPTER_INFO *get_adapter_info (DWORD index, struct gc_arena *gc);
+const IP_PER_ADAPTER_INFO *get_per_adapter_info (const DWORD index, struct gc_arena *gc);
+const IP_ADAPTER_INFO *get_adapter (const IP_ADAPTER_INFO *ai, DWORD index);
+
+bool is_adapter_up (const struct tuntap *tt, const IP_ADAPTER_INFO *list);
+bool is_ip_in_adapter_subnet (const IP_ADAPTER_INFO *ai, const in_addr_t ip, in_addr_t *highest_netmask);
+
+DWORD adapter_index_of_ip (const IP_ADAPTER_INFO *list,
+			   const in_addr_t ip,
+			   int *count,
+			   in_addr_t *netmask);
+
+void show_tap_win_adapters (int msglev, int warnlev);
+void show_adapters (int msglev);
+
+void tap_allow_nonadmin_access (const char *dev_node);
+
+void show_valid_win32_tun_subnets (void);
+const char *tap_win_getinfo (const struct tuntap *tt, struct gc_arena *gc);
+void tun_show_debug (struct tuntap *tt);
+
+bool dhcp_release_by_adapter_index(const DWORD adapter_index);
+bool dhcp_renew_by_adapter_index (const DWORD adapter_index);
+
+void fork_register_dns_action (struct tuntap *tt);
+void ipconfig_register_dns (const struct env_set *es);
+
+void tun_standby_init (struct tuntap *tt);
+bool tun_standby (struct tuntap *tt);
+
+int tun_read_queue (struct tuntap *tt, int maxsize);
+int tun_write_queue (struct tuntap *tt, struct buffer *buf);
+int tun_finalize (HANDLE h, struct overlapped_io *io, struct buffer *buf);
+
+static inline bool
+tuntap_stop (int status)
+{
+  /*
+   * This corresponds to the STATUS_NO_SUCH_DEVICE
+   * error in tapdrvr.c.
+   */
+  if (status < 0)
+    {
+      return openvpn_errno () == ERROR_FILE_NOT_FOUND;
+    }
+  return false;
+}
+
+static inline int
+tun_write_win32 (struct tuntap *tt, struct buffer *buf)
+{
+  int err = 0;
+  int status = 0;
+  if (overlapped_io_active (&tt->writes))
+    {
+      status = tun_finalize (tt->hand, &tt->writes, NULL);
+      if (status < 0)
+	err = GetLastError ();
+    }
+  tun_write_queue (tt, buf);
+  if (status < 0)
+    {
+      SetLastError (err);
+      return status;
+    }
+  else
+    return BLEN (buf);
+}
+
+static inline int
+read_tun_buffered (struct tuntap *tt, struct buffer *buf, int maxsize)
+{
+  return tun_finalize (tt->hand, &tt->reads, buf);
+}
+
+static inline int
+write_tun_buffered (struct tuntap *tt, struct buffer *buf)
+{
+  return tun_write_win32 (tt, buf);
+}
+
+#else
+
+static inline bool
+tuntap_stop (int status)
+{
+  return false;
+}
+
+static inline void
+tun_standby_init (struct tuntap *tt)
+{
+}
+
+static inline bool
+tun_standby (struct tuntap *tt)
+{
+  return true;
+}
+
+#endif
+
+/*
+ * TUN/TAP I/O wait functions
+ */
+
+static inline event_t
+tun_event_handle (const struct tuntap *tt)
+{
+#ifdef WIN32
+  return &tt->rw_handle;
+#else
+  return tt->fd;
+#endif
+}
+
+static inline unsigned int
+tun_set (struct tuntap *tt,
+	 struct event_set *es,
+	 unsigned int rwflags,
+	 void *arg,
+	 unsigned int *persistent)
+{
+  if (tuntap_defined (tt))
+    {
+      /* if persistent is defined, call event_ctl only if rwflags has changed since last call */
+      if (!persistent || *persistent != rwflags)
+	{
+	  event_ctl (es, tun_event_handle (tt), rwflags, arg);
+	  if (persistent)
+	    *persistent = rwflags;
+	}
+#ifdef WIN32
+      if (rwflags & EVENT_READ)
+	tun_read_queue (tt, 0);
+#endif
+      tt->rwflags_debug = rwflags;
+    }
+  return rwflags;
+}
+
+const char *tun_stat (const struct tuntap *tt, unsigned int rwflags, struct gc_arena *gc);
+
+#endif /* TUN_H */