Hi Sebastian,
I am trying to debug, the mcproxy with Downstream interface being PPPoE
interface and Upstream being ethernet interface.
Can you help on, weather anybody encountered similar problem ? How to make DOWN
stream interface to work for PPPoE interfaces ? Any clues/inputs will be highly
appreciate.
Problem: Though Stream is sending from H1 and Listener running at
H2, the stream is not reaching H2
Analysis: Based on debugging, I could guess that at below YELLOW
highlighted portions of code is being hit and hence not honoring JOIN received
on a PPPoE tunnel
I think, for a point-point interfaces, the
netmask will be 255.255.255.255 (Only one host). So, I think based on code flow
the netmask check fails and not returning valid IFINDEX. JOIN received on PPPoE
interface is discarded....
Setup:
H1 -------------------------------------eth0 mcproxy
ppp1========PPPoE/CHAP========= ppp1 H2
UPStream Downstream
UDPStream sender
UDP
listenr/Subscriber/Join
CODE flow/inputs
} else if (igmp_hdr->igmp_type == IGMP_V3_MEMBERSHIP_REPORT) {
HC_LOG_DEBUG("IGMP_V3_MEMBERSHIP_REPORT received");
igmpv3_mc_report* v3_report =
reinterpret_cast<igmpv3_mc_report*>(igmp_hdr);
igmpv3_mc_record* rec =
reinterpret_cast<igmpv3_mc_record*>(reinterpret_cast<unsigned char*>(v3_report)
+ sizeof(igmpv3_mc_report));
int num_records = ntohs(v3_report->num_of_mc_records);
HC_LOG_DEBUG("\tnum of multicast records: " << num_records);
saddr = ip_hdr->ip_src;
HC_LOG_DEBUG("\tsaddr: " << saddr);
if ((if_index = m_interfaces->get_if_index(saddr)) == 0) {
HC_LOG_DEBUG("no if_index found");
return;
}
unsigned int interfaces::get_if_index(const addr_storage& saddr) const
{
HC_LOG_TRACE("");
addr_storage recv_subnet;
addr_storage src_subnet;
const if_prop_map* prop_map;
if (saddr.get_addr_family() == AF_INET) {
prop_map = m_if_prop.get_if_props();
for (auto & e : *prop_map) {
if (e.second.ip4_addr != nullptr && e.second.ip4_addr->ifa_netmask
!= nullptr && e.second.ip4_addr->ifa_addr != nullptr) {
recv_subnet = *e.second.ip4_addr->ifa_netmask;
src_subnet = *e.second.ip4_addr->ifa_addr;
src_subnet.mask_ipv4(recv_subnet);
if (src_subnet == recv_subnet.mask_ipv4(saddr)) {
return get_if_index(e.second.ip4_addr->ifa_name);
}
}
}
}else{
HC_LOG_WARN("cannot map IPv6 addr to interface index:" << saddr);
}
return INTERFACES_UNKOWN_IF_INDEX;
}
addr_storage& addr_storage::mask_ipv4(const addr_storage& subnet_mask)
{
if (this->get_addr_family() == AF_INET && subnet_mask.get_addr_family() ==
AF_INET) {
get_in_addr_mutable().s_addr &= subnet_mask.get_in_addr().s_addr;
return *this;
} else {
HC_LOG_ERROR("incompatible ip versions");
}
return *this;
}
Regards,
Ganesh
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