pimd: Add IGMP join sent/failed statistics

```
exit1-debian-11# sh ip igmp statistics
IGMP statistics
Interface           : global
V1 query            : 0
V2 query            : 0
V3 query            : 0
V2 leave            : 0
V1 report           : 0
V2 report           : 0
V3 report           : 16
mtrace response     : 0
mtrace request      : 0
unsupported         : 0
joins failed        : 0
joins sent          : 11
total groups        : 4
total source groups : 0
exit1-debian-11# sh ip igmp statistics json
{
  "global":{
    "name":"global",
    "queryV1":0,
    "queryV2":0,
    "queryV3":0,
    "leaveV3":0,
    "reportV1":0,
    "reportV2":0,
    "reportV3":16,
    "mtraceResponse":0,
    "mtraceRequest":0,
    "unsupported":0,
    "totalGroups":4,
    "totalSourceGroups":0,
    "joinsFailed":0,
    "joinsSent":11
  }
}
```

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/pimd/pim_sock.c b/pimd/pim_sock.c
index 92e2d18451..8619cc3f83 100644
--- a/pimd/pim_sock.c
+++ b/pimd/pim_sock.c
@@ -38,6 +38,7 @@
 
 #include "pimd.h"
 #include "pim_mroute.h"
+#include "pim_iface.h"
 #include "pim_sock.h"
 #include "pim_str.h"
 
@@ -233,7 +234,8 @@ int pim_socket_mcast(int protocol, pim_addr ifaddr, struct interface *ifp,
 	return fd;
 }
 
-int pim_socket_join(int fd, pim_addr group, pim_addr ifaddr, ifindex_t ifindex)
+int pim_socket_join(int fd, pim_addr group, pim_addr ifaddr, ifindex_t ifindex,
+		    struct pim_interface *pim_ifp)
 {
 	int ret;
 
@@ -248,11 +250,14 @@ int pim_socket_join(int fd, pim_addr group, pim_addr ifaddr, ifindex_t ifindex)
 	ret = setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &opt, sizeof(opt));
 #endif
 
+	pim_ifp->igmp_ifstat_joins_sent++;
+
 	if (ret) {
 		flog_err(
 			EC_LIB_SOCKET,
 			"Failure socket joining fd=%d group %pPAs on interface address %pPAs: %m",
 			fd, &group, &ifaddr);
+		pim_ifp->igmp_ifstat_joins_failed++;
 		return ret;
 	}