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pimd: fixup (S,G,rpt) prune to conform to the RFC

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Deviations -
1. Avoid using SPTbit setting. Replace that with Use_Spt macro.
2. If S is supposed to be forwarded along the RPT but has an empty OIL
prune it.

Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>
This commit is contained in:
Anuradha Karuppiah 2019-11-15 11:32:10 -08:00
parent cfa8f7eb05
commit 0688d6033a
1 changed files with 24 additions and 27 deletions
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51
pimd/pim_msg.c
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@ -126,8 +126,17 @@ size_t pim_msg_get_jp_group_size(struct list *sources)
__PRETTY_FUNCTION__, up->sg_str);
for (ALL_LIST_ELEMENTS_RO(up->sources, up_node, child)) {
if (child->sptbit == PIM_UPSTREAM_SPTBIT_TRUE) {
if (!pim_rpf_is_same(&up->rpf, &child->rpf)) {
if (!PIM_UPSTREAM_FLAG_TEST_USE_RPT(child->flags)) {
/* If we are using SPT and the SPT and RPT IIFs
* are different we can prune the source off
* of the RPT.
* If RPF_interface(S) is not resolved hold
* decision to prune as SPT may end up on the
* same IIF as RPF_interface(RP).
*/
if (child->rpf.source_nexthop.interface &&
!pim_rpf_is_same(&up->rpf,
&child->rpf)) {
size += sizeof(
struct pim_encoded_source_ipv4);
PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(
@ -143,37 +152,25 @@ size_t pim_msg_get_jp_group_size(struct list *sources)
"%s: SPT Bit and RPF'(%s) == RPF'(S,G): Not adding Prune for (%s,rpt)",
__PRETTY_FUNCTION__, up->sg_str,
child->sg_str);
} else if (pim_upstream_is_sg_rpt(child)) {
if (pim_upstream_empty_inherited_olist(child)) {
size += sizeof(
} else if (pim_upstream_empty_inherited_olist(child)) {
/* S is supposed to be forwarded along the RPT
* but it's inherited OIL is empty. So just
* prune it off.
*/
size += sizeof(
struct pim_encoded_source_ipv4);
PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(
PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(
child->flags);
if (PIM_DEBUG_PIM_PACKETS)
zlog_debug(
if (PIM_DEBUG_PIM_PACKETS)
zlog_debug(
"%s: inherited_olist(%s,rpt) is NULL, Add Prune to compound message",
__PRETTY_FUNCTION__,
child->sg_str);
} else if (!pim_rpf_is_same(&up->rpf,
&child->rpf)) {
size += sizeof(
struct pim_encoded_source_ipv4);
PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(
child->flags);
if (PIM_DEBUG_PIM_PACKETS)
zlog_debug(
"%s: RPF'(%s) != RPF'(%s,rpt), Add Prune to compound message",
__PRETTY_FUNCTION__,
up->sg_str,
child->sg_str);
} else if (PIM_DEBUG_PIM_PACKETS)
zlog_debug(
"%s: RPF'(%s) == RPF'(%s,rpt), Do not add Prune to compound message",
__PRETTY_FUNCTION__, up->sg_str,
child->sg_str);
} else if (PIM_DEBUG_PIM_PACKETS)
zlog_debug("%s: SPT bit is not set for (%s)",
__PRETTY_FUNCTION__, child->sg_str);
zlog_debug(
"%s: Do not add Prune %s to compound message %s",
__PRETTY_FUNCTION__, child->sg_str,
up->sg_str);
}
}
return size;