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, 11 insertions, 0 deletions

diff --git a/VNFs/DPPD-PROX/prox_cksum.c b/VNFs/DPPD-PROX/prox_cksum.c
index add52f2b..58e05a6b 100644
--- a/VNFs/DPPD-PROX/prox_cksum.c
+++ b/VNFs/DPPD-PROX/prox_cksum.c
@@ -112,6 +112,10 @@ inline void prox_ip_udp_cksum(struct rte_mbuf *mbuf, struct ipv4_hdr *pip, uint1
 		} else
 #endif
 		prox_tcp_cksum_sw(tcp, l4_len, pip->src_addr, pip->dst_addr);
+	} else if (pip->next_proto_id == IPPROTO_IGMP) {
+		struct igmpv2_hdr *igmp = (struct igmpv2_hdr *)(((uint8_t*)pip) + l3_len);
+		// Not sure NIC can offload IGMP checkum => do it in software
+		prox_igmp_cksum_sw(igmp, l4_len);
 	}
 }
 
@@ -153,3 +157,10 @@ inline void prox_tcp_cksum_sw(struct tcp_hdr *tcp, uint16_t len, uint32_t src_ip
 	uint16_t csum = checksum_byte_seq((uint16_t *)tcp, len);
 	tcp->cksum = csum;
 }
+
+inline void prox_igmp_cksum_sw(struct igmpv2_hdr *igmp, uint16_t len)
+{
+	igmp->checksum = 0;
+	uint16_t csum = checksum_byte_seq((uint16_t *)igmp, len);
+	igmp->checksum = csum;
+}