ip: Protocol Independent IP Neighbors

Type: feature

 - ip-neighbour: generic neighbour handling; APIs, DBs, event handling,
aging
 - arp: ARP protocol implementation
 - ip6-nd; IPv6 neighbor discovery implementation; separate ND,
MLD, RA
 - ip6-link; manage link-local addresses
 - l2-arp-term; events separated from IP neighbours, since they are not
the same.

vnet retains just enough education to perform ND/ARP packet
construction.
arp and ip6-nd to be moved to plugins soon.

Change-Id: I88dedd0006b299344f4c7024a0aa5baa6b9a8bbe
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 172 insertions, 0 deletions

diff --git a/src/vnet/ip/ip46_address.h b/src/vnet/ip/ip46_address.h
new file mode 100644
index 00000000000..f726178ee63
--- /dev/null
+++ b/src/vnet/ip/ip46_address.h
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2015-2019 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef included_ip46_address_h
+#define included_ip46_address_h
+
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/ip/ip4_packet.h>
+
+typedef enum
+{
+  IP46_TYPE_ANY,
+  IP46_TYPE_BOTH = IP46_TYPE_ANY,
+  IP46_TYPE_IP4,
+  IP46_TYPE_IP6
+} ip46_type_t;
+
+#define IP46_N_TYPES (IP46_TYPE_IP6+2)
+
+#define FOREACH_IP46_TYPE(_type) \
+  for (_type = IP46_TYPE_IP4; _type <= IP46_TYPE_IP6; _type++)
+
+extern u8 *format_ip46_type (u8 * s, va_list * args);
+
+/* *INDENT-OFF* */
+typedef CLIB_PACKED (union ip46_address_t_ {
+  struct {
+    u32 pad[3];
+    ip4_address_t ip4;
+  };
+  ip6_address_t ip6;
+  u8 as_u8[16];
+  u64 as_u64[2];
+}) ip46_address_t;
+/* *INDENT-ON* */
+
+
+format_function_t format_ip46_address;
+
+#define ip46_address_initializer {{{ 0 }}}
+
+always_inline u8
+ip46_address_is_ip4 (const ip46_address_t * ip46)
+{
+  return (((ip46)->pad[0] | (ip46)->pad[1] | (ip46)->pad[2]) == 0);
+}
+
+always_inline void
+ip46_address_mask_ip4 (ip46_address_t * ip46)
+{
+  ((ip46)->pad[0] = (ip46)->pad[1] = (ip46)->pad[2] = 0);
+}
+
+always_inline void
+ip46_address_set_ip4 (ip46_address_t * ip46, const ip4_address_t * ip)
+{
+  ip46_address_mask_ip4 (ip46);
+  ip46->ip4 = *ip;
+}
+
+always_inline void
+ip46_address_reset (ip46_address_t * ip46)
+{
+  ip46->as_u64[0] = ip46->as_u64[1] = 0;
+}
+
+always_inline int
+ip46_address_cmp (const ip46_address_t * ip46_1,
+		  const ip46_address_t * ip46_2)
+{
+  return (memcmp (ip46_1, ip46_2, sizeof (*ip46_1)));
+}
+
+always_inline u8
+ip46_address_is_zero (const ip46_address_t * ip46)
+{
+  return (ip46->as_u64[0] == 0 && ip46->as_u64[1] == 0);
+}
+
+always_inline u8
+ip46_address_is_equal (const ip46_address_t * ip46_1,
+		       const ip46_address_t * ip46_2)
+{
+  return ((ip46_1->as_u64[0] == ip46_2->as_u64[0]) &&
+	  (ip46_1->as_u64[1] == ip46_2->as_u64[1]));
+}
+
+static_always_inline int
+ip4_address_is_equal (const ip4_address_t * ip4_1,
+		      const ip4_address_t * ip4_2)
+{
+  return (ip4_1->as_u32 == ip4_2->as_u32);
+}
+
+static_always_inline int
+ip46_address_is_equal_v4 (const ip46_address_t * ip46,
+			  const ip4_address_t * ip4)
+{
+  return (ip46->ip4.as_u32 == ip4->as_u32);
+}
+
+static_always_inline int
+ip46_address_is_equal_v6 (const ip46_address_t * ip46,
+			  const ip6_address_t * ip6)
+{
+  return ((ip46->ip6.as_u64[0] == ip6->as_u64[0]) &&
+	  (ip46->ip6.as_u64[1] == ip6->as_u64[1]));
+}
+
+static_always_inline void
+ip46_address_copy (ip46_address_t * dst, const ip46_address_t * src)
+{
+  dst->as_u64[0] = src->as_u64[0];
+  dst->as_u64[1] = src->as_u64[1];
+}
+
+static_always_inline void
+ip46_address_set_ip6 (ip46_address_t * dst, const ip6_address_t * src)
+{
+  dst->as_u64[0] = src->as_u64[0];
+  dst->as_u64[1] = src->as_u64[1];
+}
+
+always_inline ip46_address_t
+to_ip46 (u32 is_ipv6, u8 * buf)
+{
+  ip46_address_t ip;
+  if (is_ipv6)
+    ip.ip6 = *((ip6_address_t *) buf);
+  else
+    ip46_address_set_ip4 (&ip, (ip4_address_t *) buf);
+  return ip;
+}
+
+always_inline ip46_type_t
+ip46_address_get_type (const ip46_address_t * ip)
+{
+  return (ip46_address_is_ip4 (ip) ? IP46_TYPE_IP4 : IP46_TYPE_IP6);
+}
+
+always_inline uword
+ip46_address_is_multicast (const ip46_address_t * a)
+{
+  return ip46_address_is_ip4 (a) ? ip4_address_is_multicast (&a->ip4) :
+    ip6_address_is_multicast (&a->ip6);
+}
+
+extern void ip4_address_increment (ip4_address_t * i);
+extern void ip6_address_increment (ip6_address_t * i);
+extern void ip46_address_increment (ip46_type_t type, ip46_address_t * ip);
+
+#endif /* included_ip46_address_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */