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Merge pull request #12879 from opensourcerouting/pim-ssm-no-rp

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pimd: don't try to check RPF for incoming SSM data
This commit is contained in:
Donald Sharp 2023-02-23 10:42:14 -05:00 committed by GitHub
commit 4b0d6b4244
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1 changed files with 55 additions and 21 deletions
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76
pimd/pim_mroute.c
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@ -34,6 +34,8 @@
#include "pim_msg.h"
static void mroute_read_on(struct pim_instance *pim);
static int pim_upstream_mroute_update(struct channel_oil *c_oil,
const char *name);
int pim_mroute_set(struct pim_instance *pim, int enable)
{
@ -145,45 +147,66 @@ int pim_mroute_msg_nocache(int fd, struct interface *ifp, const kernmsg *msg)
{
struct pim_interface *pim_ifp = ifp->info;
struct pim_upstream *up;
struct pim_rpf *rpg;
pim_sgaddr sg;
bool desync = false;
rpg = pim_ifp ? RP(pim_ifp->pim, msg->msg_im_dst) : NULL;
/*
* If the incoming interface is unknown OR
* the Interface type is SSM we don't need to
* do anything here
*/
if (!rpg || pim_rpf_addr_is_inaddr_any(rpg)) {
if (PIM_DEBUG_MROUTE_DETAIL)
memset(&sg, 0, sizeof(sg));
sg.src = msg->msg_im_src;
sg.grp = msg->msg_im_dst;
if (!pim_ifp) {
if (PIM_DEBUG_MROUTE)
zlog_debug(
"%s: Interface is not configured correctly to handle incoming packet: Could be !pim_ifp, !SM, !RP",
__func__);
"%s: PIM not enabled on interface, dropping packet to %pSG",
ifp->name, &sg);
return 0;
}
if (!pim_is_grp_ssm(pim_ifp->pim, sg.grp)) {
/* for ASM, check that we have enough information (i.e. path
* to RP) to make a decision on what to do with this packet.
*
* for SSM, this is meaningless, everything is join-driven,
* and for NOCACHE we need to install an empty OIL MFC entry
* so the kernel doesn't keep nagging us.
*/
struct pim_rpf *rpg;
rpg = RP(pim_ifp->pim, msg->msg_im_dst);
if (!rpg) {
if (PIM_DEBUG_MROUTE)
zlog_debug("%s: no RPF for packet to %pSG",
ifp->name, &sg);
return 0;
}
if (pim_rpf_addr_is_inaddr_any(rpg)) {
if (PIM_DEBUG_MROUTE)
zlog_debug("%s: null RPF for packet to %pSG",
ifp->name, &sg);
return 0;
}
}
/*
* If we've received a multicast packet that isn't connected to
* us
*/
if (!pim_if_connected_to_source(ifp, msg->msg_im_src)) {
if (PIM_DEBUG_MROUTE_DETAIL)
if (PIM_DEBUG_MROUTE)
zlog_debug(
"%s: Received incoming packet that doesn't originate on our seg",
__func__);
"%s: incoming packet to %pSG from non-connected source",
ifp->name, &sg);
return 0;
}
memset(&sg, 0, sizeof(sg));
sg.src = msg->msg_im_src;
sg.grp = msg->msg_im_dst;
if (!(PIM_I_am_DR(pim_ifp))) {
/* unlike the other debug messages, this one is further in the
* "normal operation" category and thus under _DETAIL
*/
if (PIM_DEBUG_MROUTE_DETAIL)
zlog_debug(
"%s: Interface is not the DR blackholing incoming traffic for %pSG",
__func__, &sg);
"%s: not DR on interface, not forwarding traffic for %pSG",
ifp->name, &sg);
/*
* We are not the DR, but we are still receiving packets
@ -204,6 +227,12 @@ int pim_mroute_msg_nocache(int fd, struct interface *ifp, const kernmsg *msg)
up = pim_upstream_find_or_add(&sg, ifp, PIM_UPSTREAM_FLAG_MASK_FHR,
__func__);
if (up->channel_oil->installed) {
zlog_warn(
"%s: NOCACHE for %pSG, MFC entry disappeared - reinstalling",
ifp->name, &sg);
desync = true;
}
/*
* I moved this debug till after the actual add because
@ -227,6 +256,11 @@ int pim_mroute_msg_nocache(int fd, struct interface *ifp, const kernmsg *msg)
/* if we have receiver, inherit from parent */
pim_upstream_inherited_olist_decide(pim_ifp->pim, up);
/* we just got NOCACHE from the kernel, so... MFC is not in the
* kernel for some reason or another. Try installing again.
*/
if (desync)
pim_upstream_mroute_update(up->channel_oil, __func__);
return 0;
}