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nic_router: minor style fixes

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Ref #2534
This commit is contained in:
Martin Stein 2017-10-16 12:42:06 +02:00 committed by Christian Helmuth
parent db9d4d3a3c
commit 5e227f9ff1
2 changed files with 61 additions and 62 deletions
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2
repos/os/src/server/nic_router/domain.cc
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@ -212,7 +212,7 @@ void Domain::_ip_config_changed()
}
catch (Xml_node::Nonexistent_sub_node) { }
catch (Dhcp_server::Invalid) {
error("Invalid DHCP server configuration at domain ", *this); }
error("Invalid DHCP server configuration at domain \"", *this, "\""); }
}

111
repos/os/src/server/nic_router/interface.cc
View File

@ -324,76 +324,75 @@ void Interface::_send_dhcp_reply(Dhcp_server const &dhcp_srv,
catch (...) { throw Alloc_dhcp_msg_buffer_failed(); }
/* create ETH header of the reply */
Size_guard reply_size;
reply_size.add(sizeof(Ethernet_frame));
Ethernet_frame &reply_eth = *reinterpret_cast<Ethernet_frame *>(buf);
reply_eth.dst(client_mac);
reply_eth.src(_router_mac);
reply_eth.type(Ethernet_frame::Type::IPV4);
Size_guard size;
size.add(sizeof(Ethernet_frame));
Ethernet_frame &eth = *reinterpret_cast<Ethernet_frame *>(buf);
eth.dst(client_mac);
eth.src(_router_mac);
eth.type(Ethernet_frame::Type::IPV4);
/* create IP header of the reply */
enum { IPV4_TIME_TO_LIVE = 64 };
size_t const reply_ip_off = reply_size.curr();
reply_size.add(sizeof(Ipv4_packet));
Ipv4_packet &reply_ip = *reply_eth.data<Ipv4_packet>();
reply_ip.header_length(sizeof(Ipv4_packet) / 4);
reply_ip.version(4);
reply_ip.diff_service(0);
reply_ip.identification(0);
reply_ip.flags(0);
reply_ip.fragment_offset(0);
reply_ip.time_to_live(IPV4_TIME_TO_LIVE);
reply_ip.protocol(Ipv4_packet::Protocol::UDP);
reply_ip.src(_router_ip());
reply_ip.dst(client_ip);
size_t const ip_off = size.curr();
size.add(sizeof(Ipv4_packet));
Ipv4_packet &ip = *eth.data<Ipv4_packet>();
ip.header_length(sizeof(Ipv4_packet) / 4);
ip.version(4);
ip.diff_service(0);
ip.identification(0);
ip.flags(0);
ip.fragment_offset(0);
ip.time_to_live(IPV4_TIME_TO_LIVE);
ip.protocol(Ipv4_packet::Protocol::UDP);
ip.src(_router_ip());
ip.dst(client_ip);
/* create UDP header of the reply */
size_t const reply_udp_off = reply_size.curr();
reply_size.add(sizeof(Udp_packet));
Udp_packet &reply_udp = *reply_ip.data<Udp_packet>();
reply_udp.src_port(Port(Dhcp_packet::BOOTPS));
reply_udp.dst_port(Port(Dhcp_packet::BOOTPC));
size_t const udp_off = size.curr();
size.add(sizeof(Udp_packet));
Udp_packet &udp = *ip.data<Udp_packet>();
udp.src_port(Port(Dhcp_packet::BOOTPS));
udp.dst_port(Port(Dhcp_packet::BOOTPC));
/* create mandatory DHCP fields of the reply */
reply_size.add(sizeof(Dhcp_packet));
Dhcp_packet &reply_dhcp = *reply_udp.data<Dhcp_packet>();
reply_dhcp.op(Dhcp_packet::REPLY);
reply_dhcp.htype(Dhcp_packet::Htype::ETH);
reply_dhcp.hlen(sizeof(Mac_address));
reply_dhcp.hops(0);
reply_dhcp.xid(xid);
reply_dhcp.secs(0);
reply_dhcp.flags(0);
reply_dhcp.ciaddr(msg_type == Dhcp_packet::Message_type::INFORM ? client_ip : Ipv4_address());
reply_dhcp.yiaddr(msg_type == Dhcp_packet::Message_type::INFORM ? Ipv4_address() : client_ip);
reply_dhcp.siaddr(_router_ip());
reply_dhcp.giaddr(Ipv4_address());
reply_dhcp.client_mac(client_mac);
reply_dhcp.zero_fill_sname();
reply_dhcp.zero_fill_file();
reply_dhcp.default_magic_cookie();
size.add(sizeof(Dhcp_packet));
Dhcp_packet &dhcp = *udp.data<Dhcp_packet>();
dhcp.op(Dhcp_packet::REPLY);
dhcp.htype(Dhcp_packet::Htype::ETH);
dhcp.hlen(sizeof(Mac_address));
dhcp.hops(0);
dhcp.xid(xid);
dhcp.secs(0);
dhcp.flags(0);
dhcp.ciaddr(msg_type == Dhcp_packet::Message_type::INFORM ? client_ip : Ipv4_address());
dhcp.yiaddr(msg_type == Dhcp_packet::Message_type::INFORM ? Ipv4_address() : client_ip);
dhcp.siaddr(_router_ip());
dhcp.giaddr(Ipv4_address());
dhcp.client_mac(client_mac);
dhcp.zero_fill_sname();
dhcp.zero_fill_file();
dhcp.default_magic_cookie();
/* append DHCP option fields to the reply */
Dhcp_packet::Options_aggregator<Size_guard>
reply_dhcp_opts(reply_dhcp, reply_size);
reply_dhcp_opts.append_option<Dhcp_packet::Message_type_option>(msg_type);
reply_dhcp_opts.append_option<Dhcp_packet::Server_ipv4>(_router_ip());
reply_dhcp_opts.append_option<Dhcp_packet::Ip_lease_time>(dhcp_srv.ip_lease_time().value / 1000 / 1000);
reply_dhcp_opts.append_option<Dhcp_packet::Subnet_mask>(_ip_config().interface.subnet_mask());
reply_dhcp_opts.append_option<Dhcp_packet::Router_ipv4>(_router_ip());
Dhcp_packet::Options_aggregator<Size_guard> dhcp_opts(dhcp, size);
dhcp_opts.append_option<Dhcp_packet::Message_type_option>(msg_type);
dhcp_opts.append_option<Dhcp_packet::Server_ipv4>(_router_ip());
dhcp_opts.append_option<Dhcp_packet::Ip_lease_time>(dhcp_srv.ip_lease_time().value / 1000 / 1000);
dhcp_opts.append_option<Dhcp_packet::Subnet_mask>(_ip_config().interface.subnet_mask());
dhcp_opts.append_option<Dhcp_packet::Router_ipv4>(_router_ip());
if (dhcp_srv.dns_server().valid()) {
reply_dhcp_opts.append_option<Dhcp_packet::Dns_server_ipv4>(dhcp_srv.dns_server()); }
reply_dhcp_opts.append_option<Dhcp_packet::Broadcast_addr>(_ip_config().interface.broadcast_address());
reply_dhcp_opts.append_option<Dhcp_packet::Options_end>();
dhcp_opts.append_option<Dhcp_packet::Dns_server_ipv4>(dhcp_srv.dns_server()); }
dhcp_opts.append_option<Dhcp_packet::Broadcast_addr>(_ip_config().interface.broadcast_address());
dhcp_opts.append_option<Dhcp_packet::Options_end>();
/* fill in header values that need the packet to be complete already */
reply_udp.length(reply_size.curr() - reply_udp_off);
reply_udp.update_checksum(reply_ip.src(), reply_ip.dst());
reply_ip.total_length(reply_size.curr() - reply_ip_off);
reply_ip.checksum(Ipv4_packet::calculate_checksum(reply_ip));
udp.length(size.curr() - udp_off);
udp.update_checksum(ip.src(), ip.dst());
ip.total_length(size.curr() - ip_off);
ip.checksum(Ipv4_packet::calculate_checksum(ip));
/* send reply to sender of request and free reply buffer */
send(reply_eth, reply_size.curr());
send(eth, size.curr());
_alloc.free(buf, BUF_SIZE);
}