Add support for igmp and multicast

Multicast can be enabled through configuration or through command line
- Through configuration
  Add multicast=mcast_address (e.g. multicast=01:00:5e:01:02:03) in the port
  section
- Through command line
  run enable multicast port_id mcast_address (e.g. enable multicast 1 01:00:5e:01:02:03)

IGMP join message is sent unsollicited through command line:
  join igmp core_id task_id ip (e.g. join igmp 1 0 224.1.1.3)

To enable swap answering IGMP Query (w/ IGMP Join)
- Through configuration
  Add igmp ipv4=ip_address within the core/task section
- Through command line
  join igmp core_id task_id ip (e.g. join igmp 1 0 224.1.1.3)
  (this will 1st initiate an unsollicated join, then answer any subsequent query)

UDP/TCP packets received on a multicast address (224.0.0.0 => 239.255.255.255) are discarded

To stop sending responses to IGMP query:
  leave igmp core_id task_id

Change-Id: I3808ccabf3b38b5a1e10e1b044db63aa05bcd7b5
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/VNFs/DPPD-PROX/igmp.h b/VNFs/DPPD-PROX/igmp.h
new file mode 100644
index 00000000..7b868aae
--- /dev/null
+++ b/VNFs/DPPD-PROX/igmp.h
@@ -0,0 +1,59 @@
+/*
+// Copyright (c) 2019 Intel Corporation
+//
+// 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 _IGMP_H_
+#define _IGMP_H_
+
+#define IGMP_MEMBERSHIP_QUERY		0x11
+#define IGMP_MEMBERSHIP_REPORT_V1	0x12
+#define IGMP_MEMBERSHIP_REPORT		0x16
+#define IGMP_LEAVE_GROUP		0x17
+
+struct igmpv1_hdr {
+	uint8_t   type: 4;    /* type */
+	uint8_t   version: 4; /* version */
+	uint8_t   unused;     /* unused */
+	uint16_t  checksum;   /* checksum */
+	uint32_t  group_address;   /* group address */
+} __attribute__((__packed__));
+
+struct igmpv2_hdr {
+	uint8_t   type;          /* type */
+	uint8_t   max_resp_time; /* maximum response time */
+	uint16_t  checksum;      /* checksum */
+	uint32_t  group_address; /* group address */
+} __attribute__((__packed__));
+
+struct igmpv3_hdr {
+	uint8_t   type;          /* type */
+	uint8_t   max_resp_time; /* maximum response time */
+	uint16_t  checksum;      /* checksum */
+	uint32_t  group_address; /* group address */
+	uint8_t   bits: 4;       /* S(suppress router-side processing)QRV(Querier.s Robustness Variable) bits */
+	uint8_t   reserved: 4;   /* reserved */
+	uint8_t   QQIC;          /* Querier.s Query Interval Code */
+	uint16_t  n_src;         /* Number of source addresses */
+} __attribute__((__packed__));
+
+struct task_base;
+
+// igmp_join and leave functions are so far implemented within handle_swap.
+// Only swap task can use them right now, as they use igmp_pool
+// only defined in swap task.
+void igmp_join_group(struct task_base *tbase, uint32_t igmp_address);
+void igmp_leave_group(struct task_base *tbase);
+
+#endif /* _IGMP_H_ */