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bbf7a6230e
Start and stop the DHCP state machine as the Nic link-state changes. Invoke the link state handler during configuration rather than assume that in the case of a downed link lwIP will defer DHCP until the link comes up. Additionally, support static DNS configuration via the "nameserver" configuration attribute. Fix #3388
426 lines
9.7 KiB
C++
426 lines
9.7 KiB
C++
/*
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* \brief LwIP netif for the Nic session
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* \author Emery Hemingway
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* \date 2016-09-28
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*
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* If you want to use the lwIP API in a native Genode
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* component then this is the Nic client to use.
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*/
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/*
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* Copyright (C) 2016-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef __LWIP__NIC_NETIF_H__
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#define __LWIP__NIC_NETIF_H__
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#if ETH_PAD_SIZE
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#error ETH_PAD_SIZE defined but unsupported by lwip/nic_netif.h
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#endif
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#ifndef __cplusplus
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#error lwip/nic_netif.h is a C++ only header
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#endif
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/* Genode includes */
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#include <nic/packet_allocator.h>
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#include <nic_session/connection.h>
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#include <base/log.h>
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namespace Lwip {
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extern "C" {
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/* LwIP includes */
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#include <lwip/netif.h>
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#include <netif/etharp.h>
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#if LWIP_IPV6
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#include <lwip/ethip6.h>
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#endif
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#include <lwip/init.h>
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#include <lwip/dhcp.h>
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#include <lwip/dns.h>
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}
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class Nic_netif;
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extern "C" {
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static void nic_netif_pbuf_free(pbuf *p);
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static err_t nic_netif_init(struct netif *netif);
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static err_t nic_netif_linkoutput(struct netif *netif, struct pbuf *p);
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static void nic_netif_status_callback(struct netif *netif);
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}
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/**
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* Metadata for packet backed pbufs
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*/
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struct Nic_netif_pbuf
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{
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struct pbuf_custom p { };
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Nic_netif &netif;
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Nic::Packet_descriptor packet;
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Nic_netif_pbuf(Nic_netif &nic, Nic::Packet_descriptor &pkt)
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: netif(nic), packet(pkt)
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{
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p.custom_free_function = nic_netif_pbuf_free;
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}
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};
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}
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class Lwip::Nic_netif
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{
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private:
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enum {
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PACKET_SIZE = Nic::Packet_allocator::DEFAULT_PACKET_SIZE,
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BUF_SIZE = 128 * PACKET_SIZE,
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};
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Genode::Tslab<struct Nic_netif_pbuf, 128> _pbuf_alloc;
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Nic::Packet_allocator _nic_tx_alloc;
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Nic::Connection _nic;
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struct netif _netif { };
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ip_addr_t ip { };
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ip_addr_t nm { };
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ip_addr_t gw { };
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Genode::Io_signal_handler<Nic_netif> _link_state_handler;
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Genode::Io_signal_handler<Nic_netif> _rx_packet_handler;
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bool _dhcp { false };
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public:
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void free_pbuf(Nic_netif_pbuf &pbuf)
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{
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if (!_nic.rx()->ready_to_ack()) {
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Genode::error("Nic rx acknowledgement queue congested, blocking to free pbuf");
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}
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_nic.rx()->acknowledge_packet(pbuf.packet);
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destroy(_pbuf_alloc, &pbuf);
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}
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/*************************
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** Nic signal handlers **
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*************************/
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void handle_link_state()
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{
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/*
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* if the application wants to be informed of the
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* link state then it should use 'set_link_callback'
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*/
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if (_nic.link_state()) {
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netif_set_link_up(&_netif);
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if (_dhcp) {
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err_t err = dhcp_start(&_netif);
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if (err != ERR_OK) {
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Genode::error("failed to configure lwIP interface with DHCP, error ", -err);
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}
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} else {
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dhcp_inform(&_netif);
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}
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} else {
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netif_set_link_down(&_netif);
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if (_dhcp) {
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dhcp_release_and_stop(&_netif);
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}
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}
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}
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void handle_rx_packets()
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{
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auto &rx = *_nic.rx();
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while (rx.packet_avail() && rx.ready_to_ack()) {
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Nic::Packet_descriptor packet = rx.get_packet();
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Nic_netif_pbuf *nic_pbuf = new (_pbuf_alloc)
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Nic_netif_pbuf(*this, packet);
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pbuf* p = pbuf_alloced_custom(
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PBUF_RAW,
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packet.size(),
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PBUF_REF,
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&nic_pbuf->p,
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rx.packet_content(packet),
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packet.size());
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LINK_STATS_INC(link.recv);
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if (_netif.input(p, &_netif) != ERR_OK) {
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Genode::error("error forwarding Nic packet to lwIP");
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pbuf_free(p);
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}
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}
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}
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void configure(Genode::Xml_node const &config)
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{
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_dhcp = config.attribute_value("dhcp", false);
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typedef Genode::String<IPADDR_STRLEN_MAX> Str;
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Str ip_str = config.attribute_value("ip_addr", Str());
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if (_dhcp && ip_str != "") {
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_dhcp = false;
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netif_set_down(&_netif);
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Genode::error("refusing to configure lwIP interface with both DHCP and a static IPv4 address");
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return;
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}
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netif_set_up(&_netif);
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if (ip_str != "") {
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ip_addr_t ipaddr;
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if (!ipaddr_aton(ip_str.string(), &ipaddr)) {
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Genode::error("lwIP configured with invalid IP address '",ip_str,"'");
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throw ip_str;
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}
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netif_set_ipaddr(&_netif, ip_2_ip4(&ipaddr));
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if (config.has_attribute("netmask")) {
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Str str = config.attribute_value("netmask", Str());
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ip_addr_t ip;
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ipaddr_aton(str.string(), &ip);
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netif_set_netmask(&_netif, ip_2_ip4(&ip));
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}
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if (config.has_attribute("gateway")) {
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Str str = config.attribute_value("gateway", Str());
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ip_addr_t ip;
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ipaddr_aton(str.string(), &ip);
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netif_set_gw(&_netif, ip_2_ip4(&ip));
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}
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}
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if (config.has_attribute("nameserver")) {
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/*
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* LwIP does not use DNS internally, but the application
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* should expect "dns_getserver" to work regardless of
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* how the netif configures itself.
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*/
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Str str = config.attribute_value("nameserver", Str());
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ip_addr_t ip;
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ipaddr_aton(str.string(), &ip);
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dns_setserver(0, &ip);
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}
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handle_link_state();
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}
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Nic_netif(Genode::Env &env,
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Genode::Allocator &alloc,
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Genode::Xml_node config)
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:
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_pbuf_alloc(alloc), _nic_tx_alloc(&alloc),
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_nic(env, &_nic_tx_alloc,
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BUF_SIZE, BUF_SIZE,
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config.attribute_value("label", Genode::String<160>("lwip")).string()),
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_link_state_handler(env.ep(), *this, &Nic_netif::handle_link_state),
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_rx_packet_handler( env.ep(), *this, &Nic_netif::handle_rx_packets)
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{
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Genode::memset(&_netif, 0x00, sizeof(_netif));
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{
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ip4_addr_t v4dummy;
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IP4_ADDR(&v4dummy, 0, 0, 0, 0);
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netif* r = netif_add(&_netif, &v4dummy, &v4dummy, &v4dummy,
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this, nic_netif_init, ethernet_input);
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if (r == NULL) {
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Genode::error("failed to initialize Nic to lwIP interface");
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throw r;
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}
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}
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netif_set_default(&_netif);
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netif_set_status_callback(
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&_netif, nic_netif_status_callback);
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nic_netif_status_callback(&_netif);
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configure(config);
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}
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virtual ~Nic_netif() { }
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/**
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* Status callback to override in subclass
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*/
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virtual void status_callback() { }
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/**
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* Callback issued by lwIP to initialize netif struct
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*
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* \noapi
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*/
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err_t init()
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{
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/*
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* XXX: hostname and MTU could probably be
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* set in the Nic client constructor
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*/
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#if LWIP_NETIF_HOSTNAME
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/* Initialize interface hostname */
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_netif.hostname = "";
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#endif /* LWIP_NETIF_HOSTNAME */
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_netif.name[0] = 'e';
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_netif.name[1] = 'n';
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_netif.output = etharp_output;
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#if LWIP_IPV6
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_netif.output_ip6 = ethip6_output;
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#endif /* LWIP_IPV6 */
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_netif.linkoutput = nic_netif_linkoutput;
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/* Set physical MAC address */
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Nic::Mac_address const mac = _nic.mac_address();
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for(int i=0; i<6; ++i)
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_netif.hwaddr[i] = mac.addr[i];
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_netif.mtu = 1500; /* XXX: just a guess */
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_netif.hwaddr_len = ETHARP_HWADDR_LEN;
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_netif.flags = NETIF_FLAG_BROADCAST |
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NETIF_FLAG_ETHARP |
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NETIF_FLAG_LINK_UP;
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/* set Nic session signal handlers */
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_nic.link_state_sigh(_link_state_handler);
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_nic.rx_channel()->sigh_packet_avail(_rx_packet_handler);
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_nic.rx_channel()->sigh_ready_to_ack(_rx_packet_handler);
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return ERR_OK;
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}
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/**
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* Callback issued by lwIP to write a Nic packet
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*
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* \noapi
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*/
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err_t linkoutput(struct pbuf *p)
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{
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auto &tx = *_nic.tx();
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/* flush acknowledgements */
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while (tx.ack_avail())
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tx.release_packet(tx.get_acked_packet());
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if (!tx.ready_to_submit()) {
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Genode::error("lwIP: Nic packet queue congested, cannot send packet");
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return ERR_WOULDBLOCK;
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}
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Nic::Packet_descriptor packet;
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try { packet = tx.alloc_packet(p->tot_len); }
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catch (...) {
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Genode::error("lwIP: Nic packet allocation failed, cannot send packet");
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return ERR_WOULDBLOCK;
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}
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/*
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* We iterate over the pbuf chain until we have read the entire
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* pbuf into the packet.
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*/
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char *dst = tx.packet_content(packet);
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for(struct pbuf *q = p; q != 0; q = q->next) {
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char const *src = (char*)q->payload;
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Genode::memcpy(dst, src, q->len);
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dst += q->len;
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}
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tx.submit_packet(packet);
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LINK_STATS_INC(link.xmit);
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return ERR_OK;
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}
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bool ready()
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{
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return netif_is_up(&_netif) &&
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!ip_addr_isany(&_netif.ip_addr);
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}
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};
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/**************************
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** LwIP netif callbacks **
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**************************/
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namespace Lwip {
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extern "C" {
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/**
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* Free a packet buffer backed pbuf
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*/
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static void nic_netif_pbuf_free(pbuf *p)
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{
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Nic_netif_pbuf *nic_pbuf = reinterpret_cast<Nic_netif_pbuf*>(p);
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nic_pbuf->netif.free_pbuf(*nic_pbuf);
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}
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/**
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* Initialize the netif
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*/
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static err_t nic_netif_init(struct netif *netif)
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{
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Lwip::Nic_netif *nic_netif = (Lwip::Nic_netif *)netif->state;
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return nic_netif->init();
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}
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/**
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* Send a raw packet to the Nic session
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*/
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static err_t nic_netif_linkoutput(struct netif *netif, struct pbuf *p)
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{
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Lwip::Nic_netif *nic_netif = (Lwip::Nic_netif *)netif->state;
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return nic_netif->linkoutput(p);
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}
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static void nic_netif_status_callback(struct netif *netif)
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{
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Lwip::Nic_netif *nic_netif = (Lwip::Nic_netif *)netif->state;
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if (netif_is_up(netif)) {
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if (IP_IS_V6_VAL(netif->ip_addr)) {
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Genode::log("lwIP Nic interface up"
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", address=",(char const*)ip6addr_ntoa(netif_ip6_addr(netif, 0)));
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} else if (!ip4_addr_isany(netif_ip4_addr(netif))) {
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typedef Genode::String<IPADDR_STRLEN_MAX> Str;
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Str address((char const*)ip4addr_ntoa(netif_ip4_addr(netif)));
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Str netmask((char const*)ip4addr_ntoa(netif_ip4_netmask(netif)));
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Str gateway((char const*)ip4addr_ntoa(netif_ip4_gw(netif)));
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Genode::log("lwIP Nic interface up"
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" address=", address,
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" netmask=", netmask,
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" gateway=", gateway);
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}
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} else {
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Genode::log("lwIP Nic interface down");
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}
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nic_netif->status_callback();
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}
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}
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}
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#endif /* __LWIP__NIC_NETIF_H__ */
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