nexthop-tracking.patch

quagga: nexthop-tracking.patch

Add next hop tracking support to Quagga. Complete documentation in doc/next-hop-tracking.txt.

Signed-off-by: Pradosh Mohapatra <pmohapat@cumulusnetworks.com>
Signed-off-by: Daniel Walton <dwalton@cumulusnetworks.com>
Signed-off-by: Dinesh Dutt <ddutt@cumulusnetworks.com>

1 files changed, 89 insertions, 0 deletions

diff --git a/lib/nexthop.h b/lib/nexthop.h
new file mode 100644
index 000000000..bddac6554
--- /dev/null
+++ b/lib/nexthop.h
@@ -0,0 +1,89 @@
+/*
+ * Nexthop structure definition.
+ * Copyright (C) 2013 Cumulus Networks, Inc.
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef _LIB_NEXTHOP_H
+#define _LIB_NEXTHOP_H
+
+#include "prefix.h"
+
+union g_addr {
+  struct in_addr ipv4;
+#ifdef HAVE_IPV6
+  struct in6_addr ipv6;
+#endif /* HAVE_IPV6 */
+};
+
+enum nexthop_types_t
+{
+  NEXTHOP_TYPE_IFINDEX = 1,      /* Directly connected.  */
+  NEXTHOP_TYPE_IFNAME,           /* Interface route.  */
+  NEXTHOP_TYPE_IPV4,             /* IPv4 nexthop.  */
+  NEXTHOP_TYPE_IPV4_IFINDEX,     /* IPv4 nexthop with ifindex.  */
+  NEXTHOP_TYPE_IPV4_IFNAME,      /* IPv4 nexthop with ifname.  */
+  NEXTHOP_TYPE_IPV6,             /* IPv6 nexthop.  */
+  NEXTHOP_TYPE_IPV6_IFINDEX,     /* IPv6 nexthop with ifindex.  */
+  NEXTHOP_TYPE_IPV6_IFNAME,      /* IPv6 nexthop with ifname.  */
+  NEXTHOP_TYPE_BLACKHOLE,        /* Null0 nexthop.  */
+};
+
+/* Nexthop structure. */
+struct nexthop
+{
+  struct nexthop *next;
+  struct nexthop *prev;
+
+  /* Interface index. */
+  char *ifname;
+  unsigned int ifindex;
+
+  enum nexthop_types_t type;
+
+  u_char flags;
+#define NEXTHOP_FLAG_ACTIVE     (1 << 0) /* This nexthop is alive. */
+#define NEXTHOP_FLAG_FIB        (1 << 1) /* FIB nexthop. */
+#define NEXTHOP_FLAG_RECURSIVE  (1 << 2) /* Recursive nexthop. */
+#define NEXTHOP_FLAG_ONLINK     (1 << 3) /* Nexthop should be installed onlink. */
+#define NEXTHOP_FLAG_MATCHED    (1 << 4) /* Already matched vs a nexthop */
+
+  /* Nexthop address */
+  union g_addr gate;
+  union g_addr src;
+
+  /* Nexthops obtained by recursive resolution.
+   *
+   * If the nexthop struct needs to be resolved recursively,
+   * NEXTHOP_FLAG_RECURSIVE will be set in flags and the nexthops
+   * obtained by recursive resolution will be added to `resolved'.
+   * Only one level of recursive resolution is currently supported. */
+  struct nexthop *resolved;
+};
+
+#define nexthop_new()                                                   \
+({                                                                      \
+  struct nexthop *n = XCALLOC (MTYPE_NEXTHOP, sizeof (struct nexthop)); \
+  n;                                                                    \
+})
+
+extern const char *nexthop_type_to_str (enum nexthop_types_t nh_type);
+extern int nexthop_same_no_recurse (struct nexthop *next1, struct nexthop *next2);
+
+#endif /*_LIB_NEXTHOP_H */