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pimd: Add pim_channel_oil_change_iif

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Add a function that allows you to modify the channel oil's incoming
interface and to appropriately install/remove it from the kernel.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2019-07-08 19:46:01 -04:00
parent a85de978b6
commit afb2f47031
6 changed files with 54 additions and 35 deletions
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3
pimd/pim_mroute.c
View File

@ -238,7 +238,8 @@ static int pim_mroute_msg_nocache(int fd, struct interface *ifp,
vif_index = pim_if_find_vifindex_by_ifindex(
pim_ifp->pim,
up->rpf.source_nexthop.interface->ifindex);
up->channel_oil->oil.mfcc_parent = vif_index;
pim_channel_oil_change_iif(pim_ifp->pim, up->channel_oil,
vif_index, __PRETTY_FUNCTION__);
}
pim_register_join(up);

40
pimd/pim_oil.c
View File

@ -146,6 +146,43 @@ struct channel_oil *pim_find_channel_oil(struct pim_instance *pim,
return c_oil;
}
void pim_channel_oil_change_iif(struct pim_instance *pim,
struct channel_oil *c_oil,
int input_vif_index,
const char *name)
{
int old_vif_index = c_oil->oil.mfcc_parent;
struct prefix_sg sg = {.src = c_oil->oil.mfcc_mcastgrp,
.grp = c_oil->oil.mfcc_origin};
if (c_oil->oil.mfcc_parent == input_vif_index) {
if (PIM_DEBUG_MROUTE_DETAIL)
zlog_debug("%s(%s): Existing channel oil %pSG4 already using %d as IIF",
__PRETTY_FUNCTION__, name, &sg,
input_vif_index);
return;
}
if (PIM_DEBUG_MROUTE_DETAIL)
zlog_debug("%s(%s): Changing channel oil %pSG4 IIF from %d to %d installed: %d",
__PRETTY_FUNCTION__, name, &sg,
c_oil->oil.mfcc_parent, input_vif_index,
c_oil->installed);
c_oil->oil.mfcc_parent = input_vif_index;
if (c_oil->installed) {
if (input_vif_index == MAXVIFS)
pim_mroute_del(c_oil, name);
else
pim_mroute_add(c_oil, name);
} else
if (old_vif_index == MAXVIFS)
pim_mroute_add(c_oil, name);
return;
}
struct channel_oil *pim_channel_oil_add(struct pim_instance *pim,
struct prefix_sg *sg,
int input_vif_index, const char *name)
@ -164,7 +201,8 @@ struct channel_oil *pim_channel_oil_add(struct pim_instance *pim,
c_oil->oil.mfcc_parent,
input_vif_index);
}
c_oil->oil.mfcc_parent = input_vif_index;
pim_channel_oil_change_iif(pim, c_oil, input_vif_index,
name);
++c_oil->oil_ref_count;
/* channel might be present prior to upstream */
c_oil->up = pim_upstream_find(pim, sg);

3
pimd/pim_oil.h
View File

@ -114,6 +114,9 @@ struct channel_oil *pim_find_channel_oil(struct pim_instance *pim,
struct channel_oil *pim_channel_oil_add(struct pim_instance *pim,
struct prefix_sg *sg,
int input_vif_index, const char *name);
void pim_channel_oil_change_iif(struct pim_instance *pim,
struct channel_oil *c_oil, int input_vif_index,
const char *name);
void pim_channel_oil_del(struct channel_oil *c_oil, const char *name);
int pim_channel_add_oif(struct channel_oil *c_oil, struct interface *oif,

8
pimd/pim_rpf.c
View File

@ -307,11 +307,11 @@ void pim_upstream_rpf_clear(struct pim_instance *pim,
struct pim_upstream *up)
{
if (up->rpf.source_nexthop.interface) {
if (up->channel_oil) {
up->channel_oil->oil.mfcc_parent = MAXVIFS;
pim_mroute_del(up->channel_oil, __PRETTY_FUNCTION__);
if (up->channel_oil)
pim_channel_oil_change_iif(pim, up->channel_oil,
MAXVIFS,
__PRETTY_FUNCTION__);
}
pim_upstream_switch(pim, up, PIM_UPSTREAM_NOTJOINED);
up->rpf.source_nexthop.interface = NULL;
up->rpf.source_nexthop.mrib_nexthop_addr.u.prefix4.s_addr =

4
pimd/pim_static.c
View File

@ -138,7 +138,9 @@ int pim_static_add(struct pim_instance *pim, struct interface *iif,
} else {
/* input interface changed */
s_route->iif = iif_index;
s_route->c_oil.oil.mfcc_parent = iif_index;
pim_channel_oil_change_iif(pim, &s_route->c_oil,
iif_index,
__PRETTY_FUNCTION__);
#ifdef PIM_ENFORCE_LOOPFREE_MFC
/* check to make sure the new input was not an

31
pimd/pim_zebra.c
View File

@ -601,7 +601,6 @@ void pim_scan_individual_oil(struct channel_oil *c_oil, int in_vif_index)
{
struct in_addr vif_source;
int input_iface_vif_index;
int old_vif_index;
pim_rp_set_upstream_addr(c_oil->pim, &vif_source,
c_oil->oil.mfcc_origin,
@ -701,33 +700,9 @@ void pim_scan_individual_oil(struct channel_oil *c_oil, int in_vif_index)
}
/* update iif vif_index */
old_vif_index = c_oil->oil.mfcc_parent;
c_oil->oil.mfcc_parent = input_iface_vif_index;
/* update kernel multicast forwarding cache (MFC) */
if (pim_mroute_add(c_oil, __PRETTY_FUNCTION__)) {
if (PIM_DEBUG_MROUTE) {
/* just log warning */
struct interface *old_iif = pim_if_find_by_vif_index(
c_oil->pim, old_vif_index);
struct interface *new_iif = pim_if_find_by_vif_index(
c_oil->pim, input_iface_vif_index);
char source_str[INET_ADDRSTRLEN];
char group_str[INET_ADDRSTRLEN];
pim_inet4_dump("<source?>", c_oil->oil.mfcc_origin,
source_str, sizeof(source_str));
pim_inet4_dump("<group?>", c_oil->oil.mfcc_mcastgrp,
group_str, sizeof(group_str));
zlog_debug(
"%s %s: (S,G)=(%s,%s) failure updating input interface from %s vif_index=%d to %s vif_index=%d",
__FILE__, __PRETTY_FUNCTION__, source_str,
group_str,
old_iif ? old_iif->name : "<old_iif?>",
c_oil->oil.mfcc_parent,
new_iif ? new_iif->name : "<new_iif?>",
input_iface_vif_index);
}
}
pim_channel_oil_change_iif(c_oil->pim, c_oil, input_iface_vif_index,
__PRETTY_FUNCTION__);
pim_mroute_add(c_oil, __PRETTY_FUNCTION__);
}
void pim_scan_oil(struct pim_instance *pim)