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pimd: Allow SPT switchover

Browse Source 
This allows SPT switchover for S,G upon receipt of packets
on the LHR.

1) When we create a *,G from a IGMP Group Report, install
the *,G route with the pimreg device on the OIL.

2) When a packet hits the LHR that matches the *,G, we will
get a WHOLEPKT callback from the kernel and if we cannot
find the S,G, that means we have matched it on the LHR via
the *,G mroute.  Create the S,G start the KAT and run
inherited_olist.

3) When the S,G times out, safely remove the S,G via
the KAT expiry

4) When the *,G is removed, remove any S,G associated
with it via the LHR flag.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2017-03-22 21:07:57 -04:00
parent 0e374d906d
commit 850a9f99b8
4 changed files with 72 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
pimd/pim_ifchannel.c
View File

@ -1006,6 +1006,7 @@ pim_ifchannel_local_membership_add(struct interface *ifp,
pim_upstream_switch (child, PIM_UPSTREAM_JOINED);
}
}
pim_channel_add_oif(up->channel_oil, pim_regiface, PIM_OIF_FLAG_PROTO_IGMP);
}
return 1;

17
pimd/pim_mroute.c
View File

@ -200,6 +200,23 @@ pim_mroute_msg_wholepkt (int fd, struct interface *ifp, const char *buf)
up = pim_upstream_find(&sg);
if (!up) {
struct prefix_sg star = sg;
star.src.s_addr = INADDR_ANY;
up = pim_upstream_find(&star);
if (up && PIM_UPSTREAM_FLAG_TEST_SRC_IGMP(up->flags))
{
up = pim_upstream_add (&sg, ifp, PIM_UPSTREAM_FLAG_MASK_SRC_LHR, __PRETTY_FUNCTION__);
pim_upstream_keep_alive_timer_start (up, qpim_keep_alive_time);
pim_upstream_inherited_olist (up);
pim_upstream_switch(up, PIM_UPSTREAM_JOINED);
if (PIM_DEBUG_MROUTE)
zlog_debug ("%s: Creating %s upstream on LHR",
__PRETTY_FUNCTION__, up->sg_str);
return 0;
}
if (PIM_DEBUG_MROUTE_DETAIL) {
zlog_debug("%s: Unable to find upstream channel WHOLEPKT%s",
__PRETTY_FUNCTION__, pim_str_sg_dump (&sg));

77
pimd/pim_upstream.c
View File

@ -198,7 +198,20 @@ pim_upstream_del(struct pim_upstream *up, const char *name)
upstream_channel_oil_detach(up);
if (up->sources)
list_delete (up->sources);
{
struct listnode *node, *nnode;
struct pim_upstream *child;
for (ALL_LIST_ELEMENTS (up->sources, node, nnode, child))
{
if (PIM_UPSTREAM_FLAG_TEST_SRC_LHR(child->flags))
{
PIM_UPSTREAM_FLAG_UNSET_SRC_LHR(child->flags);
pim_upstream_del(child, __PRETTY_FUNCTION__);
}
}
list_delete (up->sources);
}
up->sources = NULL;
/*
@ -1083,26 +1096,31 @@ pim_upstream_keep_alive_timer (struct thread *t)
up->t_ka_timer = NULL;
if (I_am_RP (up->sg.grp))
{
pim_br_clear_pmbr (&up->sg);
/*
* We need to do more here :)
* But this is the start.
*/
}
{
pim_br_clear_pmbr (&up->sg);
/*
* We need to do more here :)
* But this is the start.
*/
}
/* source is no longer active - pull the SA from MSDP's cache */
pim_msdp_sa_local_del(&up->sg);
/* if entry was created because of activity we need to deref it */
if (PIM_UPSTREAM_FLAG_TEST_SRC_STREAM(up->flags))
{
pim_upstream_fhr_kat_expiry(up);
if (PIM_DEBUG_TRACE)
zlog_debug ("kat expired on %s; remove stream reference", up->sg_str);
PIM_UPSTREAM_FLAG_UNSET_SRC_STREAM(up->flags);
pim_upstream_del(up, __PRETTY_FUNCTION__);
}
{
pim_upstream_fhr_kat_expiry(up);
if (PIM_DEBUG_TRACE)
zlog_debug ("kat expired on %s; remove stream reference", up->sg_str);
PIM_UPSTREAM_FLAG_UNSET_SRC_STREAM(up->flags);
pim_upstream_del(up, __PRETTY_FUNCTION__);
}
else if (PIM_UPSTREAM_FLAG_TEST_SRC_LHR(up->flags))
{
PIM_UPSTREAM_FLAG_UNSET_SRC_LHR(up->flags);
pim_upstream_del(up, __PRETTY_FUNCTION__);
}
return 0;
}
@ -1633,25 +1651,28 @@ pim_upstream_sg_running (void *arg)
return;
}
if (pim_upstream_kat_start_ok(up)) {
/* Add a source reference to the stream if
* one doesn't already exist */
if (!PIM_UPSTREAM_FLAG_TEST_SRC_STREAM(up->flags))
if (pim_upstream_kat_start_ok(up))
{
if (PIM_DEBUG_TRACE)
zlog_debug ("source reference created on kat restart %s", up->sg_str);
/* Add a source reference to the stream if
* one doesn't already exist */
if (!PIM_UPSTREAM_FLAG_TEST_SRC_STREAM(up->flags))
{
if (PIM_DEBUG_TRACE)
zlog_debug ("source reference created on kat restart %s", up->sg_str);
pim_upstream_ref(up, PIM_UPSTREAM_FLAG_MASK_SRC_STREAM);
PIM_UPSTREAM_FLAG_SET_SRC_STREAM(up->flags);
pim_upstream_fhr_kat_start(up);
pim_upstream_ref(up, PIM_UPSTREAM_FLAG_MASK_SRC_STREAM);
PIM_UPSTREAM_FLAG_SET_SRC_STREAM(up->flags);
pim_upstream_fhr_kat_start(up);
}
pim_upstream_keep_alive_timer_start(up, qpim_keep_alive_time);
}
else if (PIM_UPSTREAM_FLAG_TEST_SRC_LHR(up->flags))
pim_upstream_keep_alive_timer_start(up, qpim_keep_alive_time);
}
if (up->sptbit != PIM_UPSTREAM_SPTBIT_TRUE)
{
pim_upstream_set_sptbit(up, up->rpf.source_nexthop.interface);
}
{
pim_upstream_set_sptbit(up, up->rpf.source_nexthop.interface);
}
return;
}

5
pimd/pim_upstream.h
View File

@ -34,6 +34,8 @@
#define PIM_UPSTREAM_FLAG_MASK_SRC_STREAM (1 << 5)
#define PIM_UPSTREAM_FLAG_MASK_SRC_MSDP (1 << 6)
#define PIM_UPSTREAM_FLAG_MASK_SEND_SG_RPT_PRUNE (1 << 7)
#define PIM_UPSTREAM_FLAG_MASK_SRC_LHR (1 << 8)
#define PIM_UPSTREAM_FLAG_ALL 0xFFFFFFFF
#define PIM_UPSTREAM_FLAG_TEST_DR_JOIN_DESIRED(flags) ((flags) & PIM_UPSTREAM_FLAG_MASK_DR_JOIN_DESIRED)
#define PIM_UPSTREAM_FLAG_TEST_DR_JOIN_DESIRED_UPDATED(flags) ((flags) & PIM_UPSTREAM_FLAG_MASK_DR_JOIN_DESIRED_UPDATED)
@ -43,6 +45,7 @@
#define PIM_UPSTREAM_FLAG_TEST_SRC_STREAM(flags) ((flags) & PIM_UPSTREAM_FLAG_MASK_SRC_STREAM)
#define PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(flags) ((flags) & PIM_UPSTREAM_FLAG_MASK_SRC_MSDP)
#define PIM_UPSTREAM_FLAG_TEST_SEND_SG_RPT_PRUNE(flags) ((flags) & PIM_UPSTREAM_FLAG_MASK_SEND_SG_RPT_PRUNE)
#define PIM_UPSTREAM_FLAG_TEST_SRC_LHR(flags) ((flags) & PIM_UPSTREAM_FLAG_MASK_SRC_LHR)
#define PIM_UPSTREAM_FLAG_SET_DR_JOIN_DESIRED(flags) ((flags) |= PIM_UPSTREAM_FLAG_MASK_DR_JOIN_DESIRED)
#define PIM_UPSTREAM_FLAG_SET_DR_JOIN_DESIRED_UPDATED(flags) ((flags) |= PIM_UPSTREAM_FLAG_MASK_DR_JOIN_DESIRED_UPDATED)
@ -52,6 +55,7 @@
#define PIM_UPSTREAM_FLAG_SET_SRC_STREAM(flags) ((flags) |= PIM_UPSTREAM_FLAG_MASK_SRC_STREAM)
#define PIM_UPSTREAM_FLAG_SET_SRC_MSDP(flags) ((flags) |= PIM_UPSTREAM_FLAG_MASK_SRC_MSDP)
#define PIM_UPSTREAM_FLAG_SET_SEND_SG_RPT_PRUNE(flags) ((flags) |= PIM_UPSTREAM_FLAG_MASK_SEND_SG_RPT_PRUNE)
#define PIM_UPSTREAM_FLAG_SET_SRC_LHR(flags) ((flags) |= PIM_UPSTREAM_FLAG_MASK_SRC_LHR)
#define PIM_UPSTREAM_FLAG_UNSET_DR_JOIN_DESIRED(flags) ((flags) &= ~PIM_UPSTREAM_FLAG_MASK_DR_JOIN_DESIRED)
#define PIM_UPSTREAM_FLAG_UNSET_DR_JOIN_DESIRED_UPDATED(flags) ((flags) &= ~PIM_UPSTREAM_FLAG_MASK_DR_JOIN_DESIRED_UPDATED)
@ -61,6 +65,7 @@
#define PIM_UPSTREAM_FLAG_UNSET_SRC_STREAM(flags) ((flags) &= ~PIM_UPSTREAM_FLAG_MASK_SRC_STREAM)
#define PIM_UPSTREAM_FLAG_UNSET_SRC_MSDP(flags) ((flags) &= ~PIM_UPSTREAM_FLAG_MASK_SRC_MSDP)
#define PIM_UPSTREAM_FLAG_UNSET_SEND_SG_RPT_PRUNE(flags) ((flags) &= ~PIM_UPSTREAM_FLAG_MASK_SEND_SG_RPT_PRUNE)
#define PIM_UPSTREAM_FLAG_UNSET_SRC_LHR(flags) ((flags) &= ~PIM_UPSTREAM_FLAG_MASK_SRC_LHR)
enum pim_upstream_state {
PIM_UPSTREAM_NOTJOINED,