pimd: Fix to Tx S,G Join when SGRpt->Join state

-Upon Rx (*,G) Join w/o SGRpt at RP, trigger (S,G) Join
towards FHR, unset SGRpt flag from channel,
add (*,G) oif to (S,G) entry.
-Add I am not RP check to triger SGRpt on *,G path otherwise,
send S,G Prune on SPT path from RP to FHR upon receving *,G Prune.
-Upon Rx SGRpt receive, remove OIF(downstream where Prune received) from specific S,G.

Testing Done:
pim-smoke
Ran 95 tests in 11790.552s
FAILED (SKIP=10, failures=4)

Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>

1 files changed, 6 insertions, 17 deletions

diff --git a/pimd/pim_ifchannel.c b/pimd/pim_ifchannel.c
index d46cc70b06..6f5e8f1493 100644
--- a/pimd/pim_ifchannel.c
+++ b/pimd/pim_ifchannel.c
@@ -1287,7 +1287,7 @@ pim_ifchannel_scan_forward_start (struct interface *new_ifp)
  * we get End of Message
  */
 void
-pim_ifchannel_set_star_g_join_state (struct pim_ifchannel *ch, int eom, uint8_t source_flags, uint8_t join)
+pim_ifchannel_set_star_g_join_state (struct pim_ifchannel *ch, int eom, uint8_t source_flags, uint8_t join, uint8_t starg_alone)
 {
   struct pim_ifchannel *child;
   struct listnode *ch_node;
@@ -1302,10 +1302,11 @@ pim_ifchannel_set_star_g_join_state (struct pim_ifchannel *ch, int eom, uint8_t
   for (ALL_LIST_ELEMENTS_RO (ch->sources, ch_node, child))
     {
       /* Only *,G Join received and no (SG-RPT) prune.
+         eom = 1, only (W,G) join_alone is true, WC and RPT are set.
          Scan all S,G associated to G and if any SG-RPT
          remove the SG-RPT flag.
       */
-      if (join && (source_flags & PIM_RPT_BIT_MASK) &&
+      if (eom && starg_alone && (source_flags & PIM_RPT_BIT_MASK) &&
           (source_flags & PIM_WILDCARD_BIT_MASK))
         {
           if (PIM_IF_FLAG_TEST_S_G_RPT(child->flags))
@@ -1316,25 +1317,13 @@ pim_ifchannel_set_star_g_join_state (struct pim_ifchannel *ch, int eom, uint8_t
               if (up)
                 {
                   if (PIM_DEBUG_TRACE)
-                    zlog_debug ("%s: clearing SGRpt flag, add inherit oif to up %s ", __PRETTY_FUNCTION__, up->sg_str);
+                    zlog_debug ("%s: SGRpt flag is cleared, add inherit oif to up %s",
+                            __PRETTY_FUNCTION__, up->sg_str);
                   pim_channel_add_oif (up->channel_oil, ch->interface, PIM_OIF_FLAG_PROTO_STAR);
+                  pim_ifchannel_ifjoin_switch(__PRETTY_FUNCTION__, child, PIM_IFJOIN_JOIN);
                 }
             }
         }
-      /* Received SG-RPT Prune delete oif from S,G */
-      else if (join == 0 && (source_flags & PIM_RPT_BIT_MASK) &&
-               !(source_flags & PIM_WILDCARD_BIT_MASK))
-        {
-          struct pim_upstream *up = child->upstream;
-
-          PIM_IF_FLAG_SET_S_G_RPT(child->flags);
-          if (up)
-            {
-              if (PIM_DEBUG_TRACE)
-                zlog_debug ("%s: SGRpt Set, del inherit oif from up %s", __PRETTY_FUNCTION__, up->sg_str);
-              pim_channel_del_oif (up->channel_oil, ch->interface, PIM_OIF_FLAG_PROTO_STAR);
-            }
-        }
 
       if (!PIM_IF_FLAG_TEST_S_G_RPT(child->flags))
         continue;