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nic_router: do not leak packets on link down/up

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Do not send nor buffer packets at interfaces with link state "down". This
prevents that packets that were routed to one network (allowed to see them),
due to a sudden link down/up, are leaked to another network that is not
allowed to see them.
This commit is contained in:
Martin Stein 2018-05-27 16:27:38 +02:00 committed by Christian Helmuth
parent 1306892fbf
commit a3905fcf87
4 changed files with 27 additions and 3 deletions
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13
repos/os/src/server/nic_router/interface.cc
View File

@ -1559,6 +1559,19 @@ void Interface::handle_config_1(Configuration &config)
}
void Interface::_failed_to_send_packet_link()
{
if (_config().verbose()) {
log("[", _domain(), "] failed to send packet (link down)"); }
}
void Interface::_failed_to_send_packet_alloc()
{
log("[", _domain(), "] failed to send packet (packet alloc failed)");
}
void Interface::handle_config_2()
{
Domain_name const &new_domain_name = _policy.determine_domain_name();

12
repos/os/src/server/nic_router/interface.h
View File

@ -273,10 +273,14 @@ class Net::Interface : private Interface_list::Element
void _apply_foreign_arp();
void _failed_to_send_packet_link();
void _failed_to_send_packet_alloc();
void _send_icmp_dst_unreachable(Ipv4_address_prefix const &local_intf,
Ethernet_frame const &req_eth,
Ipv4_packet const &req_ip,
Icmp_packet::Code const code);
Icmp_packet::Code const code);
/*******************
** Pure virtuals **
@ -338,6 +342,10 @@ class Net::Interface : private Interface_list::Element
template <typename FUNC>
void send(Genode::size_t pkt_size, FUNC && write_to_pkt)
{
if (!_link_state()) {
_failed_to_send_packet_link();
return;
}
try {
Packet_descriptor pkt;
void *pkt_base;
@ -348,7 +356,7 @@ class Net::Interface : private Interface_list::Element
_send_submit_pkt(pkt, pkt_base, pkt_size);
}
catch (Packet_stream_source::Packet_alloc_failed) {
Genode::warning("failed to allocate packet");
_failed_to_send_packet_alloc();
}
}

2
repos/os/src/server/nic_router/uplink.cc
View File

@ -42,11 +42,13 @@ Net::Uplink::Uplink(Env &env,
tx_channel()->sigh_ack_avail(_source_ack);
tx_channel()->sigh_ready_to_submit(_source_submit);
Nic::Connection::link_state_sigh(_link_state_handler);
_link_state_ = link_state();
}
void Net::Uplink::_handle_link_state()
{
_link_state_ = link_state();
try { domain().discard_ip_config(); }
catch (Domain::Ip_config_static) { }
}

3
repos/os/src/server/nic_router/uplink.h
View File

@ -63,6 +63,7 @@ class Net::Uplink : public Uplink_base,
};
Genode::Session_label const &_label;
bool _link_state_ { false };
Genode::Signal_handler<Uplink> _link_state_handler;
Ipv4_address_prefix _read_interface();
@ -76,7 +77,7 @@ class Net::Uplink : public Uplink_base,
Packet_stream_sink &_sink() override { return *rx(); }
Packet_stream_source &_source() override { return *tx(); }
bool _link_state() override { return link_state(); }
bool _link_state() override { return _link_state_; }
public: