IGMP improvements

- Enable/Disable an interface for IGMP
- improve logging
- refactor common code
- no orphaned timers
- IGMP state changes in main thread only
- Large groups split over multiple state-change reports
- SSM range configuration API.
- more tests

Change-Id: If5674f1044e7e97274a711f47807c9ba689d7b9a
Signed-off-by: Neale Ranns <nranns@cisco.com>

6 files changed, 234 insertions, 18 deletions

diff --git a/src/vnet/ip/igmp_packet.h b/src/vnet/ip/igmp_packet.h
index a8e9db6d9ab..cd4a40d77ff 100644
--- a/src/vnet/ip/igmp_packet.h
+++ b/src/vnet/ip/igmp_packet.h
@@ -63,32 +63,46 @@ typedef enum
 #define _(n,f) IGMP_TYPE_##f = n,
   foreach_igmp_type
 #undef _
-} igmp_type_t;
+} __attribute__ ((packed)) igmp_type_t;
 
 typedef struct
 {
-  igmp_type_t type:8;
+  igmp_type_t type;
 
   u8 code;
 
   u16 checksum;
 } igmp_header_t;
 
-typedef struct
+/**
+ * Calculate the maximum response time allowed from the header.
+ *  - RFC 3367 Section 4.1.1
+ */
+always_inline f64
+igmp_header_get_max_resp_time (const igmp_header_t * header)
 {
-  /* membership_query, version <= 2 reports. */
-  igmp_header_t header;
+  f64 qqi;
 
-  /* Multicast destination address. */
-  ip4_address_t dst;
-} igmp_message_t;
+  if (header->code < 128)
+    qqi = header->code;
+  else
+    {
+      u8 mant = header->code << 4;
+      u8 exp = (header->code & 0x7) << 1;
+
+      qqi = ((mant | 0x10) << (exp + 3));
+    }
+
+  /* Querier's Query Interval (QQI), is represented in units of seconds */
+  return (qqi / 10);
+}
 
 typedef struct
 {
   /* type 0x11 (IGMPv3) */
   igmp_header_t header;
 
-  ip4_address_t dst;
+  ip4_address_t group_address;
 
   /* Reserved, Suppress Router-Side Processing flag and
      Querier's Robustness Variable RRRRSQQQ. */
@@ -101,11 +115,25 @@ typedef struct
   ip4_address_t src_addresses[0];
 } igmp_membership_query_v3_t;
 
+always_inline u32
+igmp_membership_query_v3_length (const igmp_membership_query_v3_t * q)
+{
+  return (sizeof (*q) +
+	  (sizeof (ip4_address_t) *
+	   clib_net_to_host_u16 (q->n_src_addresses)));
+}
+
+always_inline int
+igmp_membership_query_v3_is_geeral (const igmp_membership_query_v3_t * q)
+{
+  return (0 == q->group_address.as_u32);
+}
+
 #define foreach_igmp_membership_group_v3_type	\
-  _ (1, mode_is_filter_include)			\
-  _ (2, mode_is_filter_exclude)			\
-  _ (3, change_to_filter_include)		\
-  _ (4, change_to_filter_exclude)		\
+  _ (1, mode_is_include)			\
+  _ (2, mode_is_exclude)			\
+  _ (3, change_to_include)                      \
+  _ (4, change_to_exclude)                      \
   _ (5, allow_new_sources)			\
   _ (6, block_old_sources)
 
@@ -114,11 +142,11 @@ typedef enum
 #define _(n,f) IGMP_MEMBERSHIP_GROUP_##f = n,
   foreach_igmp_membership_group_v3_type
 #undef _
-} igmp_membership_group_v3_type_t;
+} __attribute__ ((packed)) igmp_membership_group_v3_type_t;
 
 typedef struct
 {
-  igmp_membership_group_v3_type_t type:8;
+  igmp_membership_group_v3_type_t type;
 
   /* Number of 32 bit words of aux data after source addresses. */
   u8 n_aux_u32s;
@@ -126,12 +154,20 @@ typedef struct
   /* Number of source addresses that follow. */
   u16 n_src_addresses;
 
-  /* Destination multicast address. */
-  ip4_address_t dst_address;
+  /* Destination multicast group address. */
+  ip4_address_t group_address;
 
   ip4_address_t src_addresses[0];
 } igmp_membership_group_v3_t;
 
+always_inline u32
+igmp_membership_group_v3_length (const igmp_membership_group_v3_t * g)
+{
+  return (sizeof (*g) +
+	  (sizeof (ip4_address_t) *
+	   clib_net_to_host_u16 (g->n_src_addresses)));
+}
+
 always_inline igmp_membership_group_v3_t *
 igmp_membership_group_v3_next (igmp_membership_group_v3_t * g)
 {
@@ -153,6 +189,24 @@ typedef struct
   igmp_membership_group_v3_t groups[0];
 } igmp_membership_report_v3_t;
 
+always_inline u32
+igmp_membership_report_v3_length (const igmp_membership_report_v3_t * r)
+{
+  const igmp_membership_group_v3_t *g;
+  u32 len, ii, glen;
+
+  len = sizeof (igmp_membership_report_v3_t);
+  g = r->groups;
+
+  for (ii = 0; ii < clib_net_to_host_u16 (r->n_groups); ii++)
+    {
+      glen = igmp_membership_group_v3_length (g);
+      g = (const igmp_membership_group_v3_t *) (((u8 *) g) + glen);
+      len += glen;
+    }
+  return (len);
+}
+
 /* IP6 flavor of IGMP is called MLD which is embedded in ICMP6. */
 typedef struct
 {
diff --git a/src/vnet/ip/ip.api b/src/vnet/ip/ip.api
index 228e59158ff..4811a349d38 100644
--- a/src/vnet/ip/ip.api
+++ b/src/vnet/ip/ip.api
@@ -20,6 +20,7 @@
 */
 
 option version = "1.3.0";
+import "vnet/ip/ip_types.api";
 import "vnet/fib/fib_types.api";
 
 /** \brief Add / del table request
diff --git a/src/vnet/ip/ip4_error.h b/src/vnet/ip/ip4_error.h
index fa93e8673e5..52c43adb12c 100644
--- a/src/vnet/ip/ip4_error.h
+++ b/src/vnet/ip/ip4_error.h
@@ -59,7 +59,7 @@
   _ (SRC_LOOKUP_MISS, "ip4 source lookup miss")				\
   _ (DROP, "ip4 drop")                                                  \
   _ (PUNT, "ip4 punt")                                                  \
-  _ (SAME_INTERFACE, "ip4 egrees interface same as ingress")            \
+  _ (SAME_INTERFACE, "ip4 egress interface same as ingress")            \
 									\
   /* Errors signalled by ip4-local. */					\
   _ (UNKNOWN_PROTOCOL, "unknown ip protocol")				\
diff --git a/src/vnet/ip/ip_types.api b/src/vnet/ip/ip_types.api
index ec6b9d0024c..72eadaf92df 100644
--- a/src/vnet/ip/ip_types.api
+++ b/src/vnet/ip/ip_types.api
@@ -1,3 +1,4 @@
+/* Hey Emacs use -*- mode: C -*- */
 /*
  * Copyright (c) 2018 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -35,3 +36,8 @@ typedef address {
   vl_api_address_family_t af;
   vl_api_address_union_t un;
 };
+
+typedef prefix {
+  vl_api_address_t address;
+  u8 address_length;
+};
diff --git a/src/vnet/ip/ip_types_api.c b/src/vnet/ip/ip_types_api.c
new file mode 100644
index 00000000000..7fa8e404c78
--- /dev/null
+++ b/src/vnet/ip/ip_types_api.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2018 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.
+ */
+
+#include <vnet/ip/ip_types_api.h>
+
+#define vl_typedefs		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_typedefs
+
+#define vl_endianfun		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+#define vl_printfun
+#include <vnet/vnet_all_api_h.h>
+#undef vl_printfun
+
+
+void
+ip_address_decode (const vl_api_address_t * in, ip46_address_t * out)
+{
+  switch (in->af)
+    {
+    case ADDRESS_IP4:
+      memset (out, 0, sizeof (*out));
+      clib_memcpy (&out->ip4, &in->un.ip4, sizeof (out->ip4));
+      break;
+    case ADDRESS_IP6:
+      clib_memcpy (&out->ip6, &in->un.ip6, sizeof (out->ip6));
+      break;
+    }
+}
+
+void
+ip_address_encode (const ip46_address_t * in, vl_api_address_t * out)
+{
+  if (ip46_address_is_ip4 (in))
+    {
+      memset (out, 0, sizeof (*out));
+      out->af = ADDRESS_IP4;
+      clib_memcpy (&out->un.ip4, &in->ip4, sizeof (out->un.ip4));
+    }
+  else
+    {
+      out->af = ADDRESS_IP6;
+      clib_memcpy (&out->un.ip6, &in->ip6, sizeof (out->un.ip6));
+    }
+}
+
+void
+ip_prefix_decode (const vl_api_prefix_t * in, fib_prefix_t * out)
+{
+  switch (in->address.af)
+    {
+    case ADDRESS_IP4:
+      out->fp_proto = FIB_PROTOCOL_IP4;
+      break;
+    case ADDRESS_IP6:
+      out->fp_proto = FIB_PROTOCOL_IP6;
+      break;
+    }
+  out->fp_len = in->address_length;
+  ip_address_decode (&in->address, &out->fp_addr);
+}
+
+void
+ip_prefix_encode (const fib_prefix_t * in, vl_api_prefix_t * out)
+{
+  switch (in->fp_proto)
+    {
+    case FIB_PROTOCOL_IP4:
+      out->address.af = ADDRESS_IP4;
+      break;
+    case FIB_PROTOCOL_IP6:
+      out->address.af = ADDRESS_IP6;
+      break;
+    case FIB_PROTOCOL_MPLS:
+      ASSERT (0);
+      break;
+    }
+  out->address_length = in->fp_len;
+  ip_address_encode (&in->fp_addr, &out->address);
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/ip/ip_types_api.h b/src/vnet/ip/ip_types_api.h
new file mode 100644
index 00000000000..2ad59ae438e
--- /dev/null
+++ b/src/vnet/ip/ip_types_api.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2018 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 __IP_TYPES_API_H__
+#define __IP_TYPES_API_H__
+
+/**
+ * Conversion functions to/from (decode/encode) API types to VPP internal types
+ */
+
+#include <vnet/ip/ip.h>
+#include <vnet/fib/fib_types.h>
+
+/**
+ * Forward declarations so we need not #include the API definitions here
+ */
+struct _vl_api_address;
+struct _vl_api_prefix;
+
+extern void ip_address_decode (const struct _vl_api_address *in,
+			       ip46_address_t * out);
+extern void ip_address_encode (const ip46_address_t * in,
+			       struct _vl_api_address *out);
+
+extern void ip_prefix_decode (const struct _vl_api_prefix *in,
+			      fib_prefix_t * out);
+extern void ip_prefix_encode (const fib_prefix_t * in,
+			      struct _vl_api_prefix *out);
+
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */