Imported Upstream version 2.2.1upstream/2.2.1

1 files changed, 212 insertions, 0 deletions

diff --git a/mroute.h b/mroute.h
new file mode 100644
index 0000000..7265001
--- /dev/null
+++ b/mroute.h
@@ -0,0 +1,212 @@
+/*
+ *  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 MROUTE_H
+#define MROUTE_H
+
+#if P2MP_SERVER
+
+#include "buffer.h"
+#include "list.h"
+#include "route.h"
+
+#define IP_MCAST_SUBNET_MASK  ((in_addr_t)240<<24)
+#define IP_MCAST_NETWORK      ((in_addr_t)224<<24)
+
+/* Return status values for mroute_extract_addr_from_packet */
+
+#define MROUTE_EXTRACT_SUCCEEDED (1<<0)
+#define MROUTE_EXTRACT_BCAST     (1<<1)
+#define MROUTE_EXTRACT_MCAST     (1<<2)
+#define MROUTE_EXTRACT_IGMP      (1<<3)
+
+#define MROUTE_SEC_EXTRACT_SUCCEEDED (1<<(0+MROUTE_SEC_SHIFT))
+#define MROUTE_SEC_EXTRACT_BCAST     (1<<(1+MROUTE_SEC_SHIFT))
+#define MROUTE_SEC_EXTRACT_MCAST     (1<<(2+MROUTE_SEC_SHIFT))
+#define MROUTE_SEC_EXTRACT_IGMP      (1<<(3+MROUTE_SEC_SHIFT))
+
+#define MROUTE_SEC_SHIFT         4
+
+/*
+ * Choose the largest address possible with
+ * any of our supported types, which is IPv6
+ * with port number.
+ */
+#define MR_MAX_ADDR_LEN 20
+
+/*
+ * Address Types
+ */
+#define MR_ADDR_NONE             0
+#define MR_ADDR_ETHER            1
+#define MR_ADDR_IPV4             2
+#define MR_ADDR_IPV6             3
+#define MR_ADDR_MASK             3
+
+/* Address type mask indicating that port # is part of address */
+#define MR_WITH_PORT             4
+
+/* Address type mask indicating that netbits is part of address */
+#define MR_WITH_NETBITS          8
+
+/* Indicates than IPv4 addr was extracted from ARP packet */
+#define MR_ARP                   16
+
+struct mroute_addr {
+  uint8_t len;      /* length of address */
+  uint8_t unused;
+  uint8_t type;     /* MR_ADDR/MR_WITH flags */
+  uint8_t netbits;  /* number of bits in network part of address,
+		       valid if MR_WITH_NETBITS is set */
+  uint8_t addr[MR_MAX_ADDR_LEN];  /* actual address */
+};
+
+/*
+ * Number of bits in an address.  Should be raised for IPv6.
+ */
+#define MR_HELPER_NET_LEN 32
+
+/*
+ * Used to help maintain CIDR routing table.
+ */
+struct mroute_helper {
+  unsigned int cache_generation; /* incremented when route added */
+  int ageable_ttl_secs;          /* host route cache entry time-to-live*/
+  int n_net_len;                 /* length of net_len array */
+  uint8_t net_len[MR_HELPER_NET_LEN];      /* CIDR netlengths in descending order */
+  int net_len_refcount[MR_HELPER_NET_LEN]; /* refcount of each netlength */
+};
+
+struct openvpn_sockaddr;
+
+bool mroute_extract_openvpn_sockaddr (struct mroute_addr *addr,
+				      const struct openvpn_sockaddr *osaddr,
+				      bool use_port);
+
+bool mroute_learnable_address (const struct mroute_addr *addr);
+
+uint32_t mroute_addr_hash_function (const void *key, uint32_t iv);
+bool mroute_addr_compare_function (const void *key1, const void *key2);
+
+void mroute_addr_init (struct mroute_addr *addr);
+
+const char *mroute_addr_print (const struct mroute_addr *ma,
+			       struct gc_arena *gc);
+
+#define MAPF_SUBNET            (1<<0)
+#define MAPF_IA_EMPTY_IF_UNDEF (1<<1)
+#define MAPF_SHOW_ARP          (1<<2)
+const char *mroute_addr_print_ex (const struct mroute_addr *ma,
+				  const unsigned int flags,
+				  struct gc_arena *gc);
+
+void mroute_addr_mask_host_bits (struct mroute_addr *ma);
+
+struct mroute_helper *mroute_helper_init (int ageable_ttl_secs);
+void mroute_helper_free (struct mroute_helper *mh);
+void mroute_helper_add_iroute (struct mroute_helper *mh, const struct iroute *ir);
+void mroute_helper_del_iroute (struct mroute_helper *mh, const struct iroute *ir);
+
+/*
+ * Given a raw packet in buf, return the src and dest
+ * addresses of the packet.
+ */
+static inline unsigned int
+mroute_extract_addr_from_packet (struct mroute_addr *src,
+				 struct mroute_addr *dest,
+				 struct mroute_addr *esrc,
+				 struct mroute_addr *edest,
+				 const struct buffer *buf,
+				 int tunnel_type)
+{
+  unsigned int mroute_extract_addr_ipv4 (struct mroute_addr *src,
+					 struct mroute_addr *dest,
+					 const struct buffer *buf);
+
+  unsigned int mroute_extract_addr_ether (struct mroute_addr *src,
+					  struct mroute_addr *dest,
+					  struct mroute_addr *esrc,
+					  struct mroute_addr *edest,
+					  const struct buffer *buf);
+  unsigned int ret = 0;
+  verify_align_4 (buf);
+  if (tunnel_type == DEV_TYPE_TUN)
+    ret = mroute_extract_addr_ipv4 (src, dest, buf);
+  else if (tunnel_type == DEV_TYPE_TAP)
+    ret = mroute_extract_addr_ether (src, dest, esrc, edest, buf);
+  return ret;
+}
+
+static inline bool
+mroute_addr_equal (const struct mroute_addr *a1, const struct mroute_addr *a2)
+{
+  if (a1->type != a2->type)
+    return false;
+  if (a1->netbits != a2->netbits)
+    return false;
+  if (a1->len != a2->len)
+    return false;
+  return memcmp (a1->addr, a2->addr, a1->len) == 0;
+}
+
+static inline const uint8_t *
+mroute_addr_hash_ptr (const struct mroute_addr *a)
+{
+  /* NOTE: depends on ordering of struct mroute_addr */
+  return (uint8_t *) &a->type;
+}
+
+static inline uint32_t
+mroute_addr_hash_len (const struct mroute_addr *a)
+{
+  return (uint32_t) a->len + 2;
+}
+
+static inline void
+mroute_extract_in_addr_t (struct mroute_addr *dest, const in_addr_t src)
+{
+  dest->type = MR_ADDR_IPV4;
+  dest->netbits = 0;
+  dest->len = 4;
+  *(in_addr_t*)dest->addr = htonl (src);
+}
+
+static inline in_addr_t
+in_addr_t_from_mroute_addr (const struct mroute_addr *addr)
+{
+  if ((addr->type & MR_ADDR_MASK) == MR_ADDR_IPV4 && addr->netbits == 0 && addr->len == 4)
+    return ntohl(*(in_addr_t*)addr->addr);
+  else
+    return 0;
+}
+
+static inline void
+mroute_addr_reset (struct mroute_addr *ma)
+{
+  ma->len = 0;
+  ma->type = MR_ADDR_NONE;
+}
+
+#endif /* P2MP_SERVER */
+#endif /* MROUTE_H */