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pimd: Trust the recvfromto ifindex information

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The vrf interface is receiving the pim packet
instead of the slave interface that is bound.

Lookup the ifindex ifp pointer from that.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2017-06-02 20:22:39 -04:00
parent 11699c4788
commit e2d451e2ee
1 changed files with 7 additions and 29 deletions
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36
pimd/pim_pim.c
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@ -320,35 +320,13 @@ static int pim_sock_read(struct thread *t)
goto done;
}
#ifdef PIM_CHECK_RECV_IFINDEX_SANITY
/* ifindex sanity check */
if (ifindex != (int)ifp->ifindex) {
char from_str[INET_ADDRSTRLEN];
char to_str[INET_ADDRSTRLEN];
struct interface *recv_ifp;
if (!inet_ntop(AF_INET, &from.sin_addr, from_str,
sizeof(from_str)))
sprintf(from_str, "<from?>");
if (!inet_ntop(AF_INET, &to.sin_addr, to_str,
sizeof(to_str)))
sprintf(to_str, "<to?>");
recv_ifp = if_lookup_by_index(ifindex, ifp->vrf_id);
if (recv_ifp) {
zassert(ifindex == (int)recv_ifp->ifindex);
}
#ifdef PIM_REPORT_RECV_IFINDEX_MISMATCH
zlog_warn(
"Interface mismatch: recv PIM pkt from %s to %s on fd=%d: recv_ifindex=%d (%s) sock_ifindex=%d (%s)",
from_str, to_str, fd, ifindex,
recv_ifp ? recv_ifp->name : "<if-notfound>",
ifp->ifindex, ifp->name);
#endif
goto done;
}
#endif
/*
* What? So with vrf's the incoming packet is received
* on the vrf interface but recvfromto above returns
* the right ifindex, so just use it. We know
* it's the right interface because we bind to it
*/
ifp = if_lookup_by_index(ifindex, pim_ifp->pim->vrf_id);
int fail = pim_pim_packet(ifp, buf, len);
if (fail) {