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pimd: Rework zassert code in pim_assert.c

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When we encounter an error in the state machine
for an individual ifchannel, do not bring the entirety
of the pim daemon down.  Notice the issue and continue
on.

Ticket-CM-13939
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2016-12-07 10:34:58 -05:00
parent 67f771b3a3
commit a85d880293
1 changed files with 53 additions and 35 deletions
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88
pimd/pim_assert.c
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@ -182,7 +182,6 @@ static int dispatch_assert(struct interface *ifp,
}
else {
if (inferior_assert(&ch->ifassert_my_metric, &recv_metric)) {
zassert(ch->ifassert_state == PIM_IFASSERT_I_AM_WINNER); /* a3 requirement */
assert_action_a3(ch);
}
}
@ -434,12 +433,18 @@ static int pim_assert_do(struct pim_ifchannel *ch,
int pim_msg_size;
ifp = ch->interface;
zassert(ifp);
if (!ifp)
{
if (PIM_DEBUG_PIM_TRACE)
zlog_debug("%s: channel%s has no associated interface!",
__PRETTY_FUNCTION__, ch->sg_str);
return -1;
}
pim_ifp = ifp->info;
if (!pim_ifp) {
zlog_warn("%s: pim not enabled on interface: %s",
__PRETTY_FUNCTION__, ifp->name);
if (PIM_DEBUG_PIM_TRACE)
zlog_debug("%s: channel %s pim not enabled on interface: %s",
__PRETTY_FUNCTION__, ch->sg_str, ifp->name);
return -1;
}
@ -530,7 +535,6 @@ static int on_assert_timer(struct thread *t)
switch (ch->ifassert_state) {
case PIM_IFASSERT_I_AM_WINNER:
zassert(ch->ifassert_state == PIM_IFASSERT_I_AM_WINNER); /* a3 requirement */
assert_action_a3(ch);
break;
case PIM_IFASSERT_I_AM_LOSER:
@ -538,9 +542,10 @@ static int on_assert_timer(struct thread *t)
break;
default:
{
zlog_warn("%s: (S,G)=%s invalid assert state %d on interface %s",
__PRETTY_FUNCTION__,
ch->sg_str, ch->ifassert_state, ifp->name);
if (PIM_DEBUG_PIM_EVENTS)
zlog_warn("%s: (S,G)=%s invalid assert state %d on interface %s",
__PRETTY_FUNCTION__,
ch->sg_str, ch->ifassert_state, ifp->name);
}
}
@ -549,38 +554,25 @@ static int on_assert_timer(struct thread *t)
static void assert_timer_off(struct pim_ifchannel *ch)
{
struct interface *ifp;
zassert(ch);
ifp = ch->interface;
zassert(ifp);
if (PIM_DEBUG_PIM_TRACE) {
if (ch->t_ifassert_timer) {
zlog_debug("%s: (S,G)=%s cancelling timer on interface %s",
__PRETTY_FUNCTION__,
ch->sg_str, ifp->name);
ch->sg_str, ch->interface->name);
}
}
THREAD_OFF(ch->t_ifassert_timer);
zassert(!ch->t_ifassert_timer);
}
static void pim_assert_timer_set(struct pim_ifchannel *ch,
int interval)
{
struct interface *ifp;
zassert(ch);
ifp = ch->interface;
zassert(ifp);
assert_timer_off(ch);
if (PIM_DEBUG_PIM_TRACE) {
zlog_debug("%s: (S,G)=%s starting %u sec timer on interface %s",
__PRETTY_FUNCTION__,
ch->sg_str, interval, ifp->name);
ch->sg_str, interval, ch->interface->name);
}
THREAD_TIMER_ON(master, ch->t_ifassert_timer,
@ -608,8 +600,6 @@ int assert_action_a1(struct pim_ifchannel *ch)
struct interface *ifp = ch->interface;
struct pim_interface *pim_ifp;
zassert(ifp);
pim_ifp = ifp->info;
if (!pim_ifp) {
zlog_warn("%s: (S,G)=%s multicast not enabled on interface %s",
@ -624,7 +614,6 @@ int assert_action_a1(struct pim_ifchannel *ch)
pim_macro_spt_assert_metric(&ch->upstream->rpf,
pim_ifp->primary_address));
zassert(ch->ifassert_state == PIM_IFASSERT_I_AM_WINNER); /* a3 requirement */
if (assert_action_a3(ch)) {
zlog_warn("%s: (S,G)=%s assert_action_a3 failure on interface %s",
__PRETTY_FUNCTION__,
@ -632,7 +621,12 @@ int assert_action_a1(struct pim_ifchannel *ch)
/* warning only */
}
zassert(ch->ifassert_state == PIM_IFASSERT_I_AM_WINNER);
if (ch->ifassert_state != PIM_IFASSERT_I_AM_WINNER)
{
if (PIM_DEBUG_PIM_EVENTS)
zlog_warn("%s: channel%s not in expected PIM_IFASSERT_I_AM_WINNER state",
__PRETTY_FUNCTION__, ch->sg_str);
}
return 0;
}
@ -655,7 +649,12 @@ static void assert_action_a2(struct pim_ifchannel *ch,
pim_assert_timer_set(ch, PIM_ASSERT_TIME);
zassert(ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER);
if (ch->ifassert_state != PIM_IFASSERT_I_AM_LOSER)
{
if (PIM_DEBUG_PIM_EVENTS)
zlog_warn("%s: channel%s not in expected PIM_IFASSERT_I_AM_LOSER state",
__PRETTY_FUNCTION__, ch->sg_str);
}
}
/*
@ -668,7 +667,13 @@ static void assert_action_a2(struct pim_ifchannel *ch,
*/
static int assert_action_a3(struct pim_ifchannel *ch)
{
zassert(ch->ifassert_state == PIM_IFASSERT_I_AM_WINNER);
if (ch->ifassert_state != PIM_IFASSERT_I_AM_WINNER)
{
if (PIM_DEBUG_PIM_EVENTS)
zlog_warn("%s: channel%s expected to be in PIM_IFASSERT_I_AM_WINNER state",
__PRETTY_FUNCTION__, ch->sg_str);
return -1;
}
pim_assert_timer_reset(ch);
@ -679,8 +684,6 @@ static int assert_action_a3(struct pim_ifchannel *ch)
return -1;
}
zassert(ch->ifassert_state == PIM_IFASSERT_I_AM_WINNER);
return 0;
}
@ -705,7 +708,12 @@ void assert_action_a4(struct pim_ifchannel *ch)
assert_action_a5(ch);
zassert(ch->ifassert_state == PIM_IFASSERT_NOINFO);
if (ch->ifassert_state != PIM_IFASSERT_NOINFO)
{
if (PIM_DEBUG_PIM_EVENTS)
zlog_warn("%s: channel%s not in PIM_IFASSERT_NOINFO state as expected",
__PRETTY_FUNCTION__, ch->sg_str);
}
}
/*
@ -719,7 +727,12 @@ void assert_action_a4(struct pim_ifchannel *ch)
void assert_action_a5(struct pim_ifchannel *ch)
{
reset_ifassert_state(ch);
zassert(ch->ifassert_state == PIM_IFASSERT_NOINFO);
if (ch->ifassert_state != PIM_IFASSERT_NOINFO)
{
if (PIM_DEBUG_PIM_EVENTS)
zlog_warn("%s: channel%s not in PIM_IFSSERT_NOINFO state as expected",
__PRETTY_FUNCTION__, ch->sg_str);
}
}
/*
@ -746,6 +759,11 @@ static void assert_action_a6(struct pim_ifchannel *ch,
if (ch->upstream->join_state == PIM_UPSTREAM_JOINED)
ch->upstream->sptbit = PIM_UPSTREAM_SPTBIT_TRUE;
zassert(ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER);
if (ch->ifassert_state != PIM_IFASSERT_I_AM_LOSER)
{
if(PIM_DEBUG_PIM_EVENTS)
zlog_warn("%s: channel%s not in PIM_IFASSERT_I_AM_LOSER state as expected",
__PRETTY_FUNCTION__, ch->sg_str);
}
}