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nic_router: fix bugs in DHCP client functionality

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This commit is contained in:
Martin Stein 2017-11-03 14:06:46 +01:00 committed by Christian Helmuth
parent db6a2419f2
commit b2ea164c76
2 changed files with 12 additions and 2 deletions
repos/os/src/server/nic_router
dhcp_client.ccinterface.cc

7
repos/os/src/server/nic_router/dhcp_client.cc

@ -88,7 +88,9 @@ void Dhcp_client::_handle_timeout(Duration)
void Dhcp_client::handle_ip(Ethernet_frame &eth, size_t eth_size)
{
if (eth.dst() != _interface.router_mac()) {
if (eth.dst() != _interface.router_mac() &&
eth.dst() != Mac_address(0xff))
{
throw Packet_ignored("DHCP client expects Ethernet targeting the router");
}
Ipv4_packet &ip = *new (eth.data<void>())
@ -109,6 +111,9 @@ void Dhcp_client::handle_ip(Ethernet_frame &eth, size_t eth_size)
if (dhcp.op() != Dhcp_packet::REPLY) {
throw Packet_ignored("DHCP client expects DHCP reply");
}
if (dhcp.client_mac() != _interface.router_mac()) {
throw Packet_ignored("DHCP client expects DHCP targeting the router");
}
try { _handle_dhcp_reply(dhcp); }
catch (Dhcp_packet::Option_not_found) {
throw Packet_ignored("DHCP client misses DHCP option");

7
repos/os/src/server/nic_router/interface.cc

@ -836,11 +836,16 @@ void Interface::_handle_eth(void *const eth_base,
catch (Ethernet_frame::No_ethernet_frame) {
error("invalid ethernet frame"); }
catch (Interface::Bad_network_protocol) {
catch (Bad_network_protocol) {
if (_config().verbose()) {
log("unknown network layer protocol");
}
}
catch (Packet_ignored exception) {
if (_config().verbose()) {
log("Packet ignored: ", exception.reason);
}
}
catch (Ipv4_packet::No_ip_packet) {
error("invalid IP packet"); }