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p2p: use /16 filtering on IPv4-within-IPv6 addresses 

IPv6 addresses include a range that can map IPv4 addresses,
which allowed those mapped addresses to bypass filtering.

This filter should be replaced by AS filtering at some point.
This commit is contained in:
moneromooo-monero 2020-10-25 16:22:01 +00:00
parent c1229a4432
commit 1a627e1f89
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GPG Key ID: 686F07454D6CEFC3
1 changed files with 30 additions and 2 deletions
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32
src/p2p/net_node.inl
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@ -1436,6 +1436,20 @@ namespace nodetool
const uint32_t actual_ip = na.as<const epee::net_utils::ipv4_network_address>().ip();
classB.insert(actual_ip & 0x0000ffff);
}
#if BOOST_VERSION > 106600
else if (cntxt.m_remote_address.get_type_id() == epee::net_utils::ipv6_network_address::get_type_id())
{
const epee::net_utils::network_address na = cntxt.m_remote_address;
const boost::asio::ip::address_v6 &actual_ip = na.as<const epee::net_utils::ipv6_network_address>().ip();
if (actual_ip.is_v4_mapped())
{
boost::asio::ip::address_v4 v4ip = make_address_v4(boost::asio::ip::v4_mapped, actual_ip);
uint32_t actual_ipv4;
memcpy(&actual_ipv4, v4ip.to_bytes().data(), sizeof(actual_ipv4));
classB.insert(actual_ipv4 & ntohl(0xffff0000));
}
}
#endif
return true;
});
}
@ -1471,6 +1485,20 @@ namespace nodetool
uint32_t actual_ip = na.as<const epee::net_utils::ipv4_network_address>().ip();
skip = classB.find(actual_ip & 0x0000ffff) != classB.end();
}
#if BOOST_VERSION > 106600
else if (skip_duplicate_class_B && pe.adr.get_type_id() == epee::net_utils::ipv6_network_address::get_type_id())
{
const epee::net_utils::network_address na = pe.adr;
const boost::asio::ip::address_v6 &actual_ip = na.as<const epee::net_utils::ipv6_network_address>().ip();
if (actual_ip.is_v4_mapped())
{
boost::asio::ip::address_v4 v4ip = make_address_v4(boost::asio::ip::v4_mapped, actual_ip);
uint32_t actual_ipv4;
memcpy(&actual_ipv4, v4ip.to_bytes().data(), sizeof(actual_ipv4));
skip = classB.find(actual_ipv4 & ntohl(0xffff0000)) != classB.end();
}
}
#endif
// consider each host once, to avoid giving undue inflence to hosts running several nodes
if (!skip)
@ -1493,11 +1521,11 @@ namespace nodetool
if (skipped == 0 || !filtered.empty())
break;
if (skipped)
MINFO("Skipping " << skipped << " possible peers as they share a class B with existing peers");
MDEBUG("Skipping " << skipped << " possible peers as they share a class B with existing peers");
}
if (filtered.empty())
{
MDEBUG("No available peer in " << (use_white_list ? "white" : "gray") << " list filtered by " << next_needed_pruning_stripe);
MINFO("No available peer in " << (use_white_list ? "white" : "gray") << " list filtered by " << next_needed_pruning_stripe);
return false;
}
if (use_white_list)