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VFS lwIP: restart DHCP with link-state changes

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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
This commit is contained in:
Emery Hemingway 2019-05-29 11:03:52 +02:00 committed by Christian Helmuth
parent 24a3eea89e
commit bbf7a6230e
1 changed files with 59 additions and 40 deletions
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99
repos/libports/include/lwip/nic_netif.h
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@ -41,6 +41,7 @@ extern "C" {
#endif
#include <lwip/init.h>
#include <lwip/dhcp.h>
#include <lwip/dns.h>
}
class Nic_netif;
@ -94,6 +95,8 @@ class Lwip::Nic_netif
Genode::Io_signal_handler<Nic_netif> _link_state_handler;
Genode::Io_signal_handler<Nic_netif> _rx_packet_handler;
bool _dhcp { false };
public:
void free_pbuf(Nic_netif_pbuf &pbuf)
@ -114,15 +117,24 @@ class Lwip::Nic_netif
void handle_link_state()
{
/*
* if the application wants to know what is going
* on then it should use 'set_link_callback'
* if the application wants to be informed of the
* link state then it should use 'set_link_callback'
*/
if (_nic.link_state()) {
netif_set_link_up(&_netif);
/* XXX: DHCP? */
if (_dhcp) {
err_t err = dhcp_start(&_netif);
if (err != ERR_OK) {
Genode::error("failed to configure lwIP interface with DHCP, error ", -err);
}
} else {
dhcp_inform(&_netif);
}
} else {
netif_set_link_down(&_netif);
if (_dhcp) {
dhcp_release_and_stop(&_netif);
}
}
}
@ -155,51 +167,58 @@ class Lwip::Nic_netif
void configure(Genode::Xml_node const &config)
{
if (config.attribute_value("dhcp", false)) {
_dhcp = config.attribute_value("dhcp", false);
err_t err = dhcp_start(&_netif);
if (err == ERR_OK)
Genode::log("configuring lwIP interface with DHCP");
else
Genode::error("failed to configure lwIP interface with DHCP, error ", -err);
typedef Genode::String<IPADDR_STRLEN_MAX> Str;
Str ip_str = config.attribute_value("ip_addr", Str());
} else /* get addressing from config */ {
typedef Genode::String<IPADDR_STRLEN_MAX> Str;
Str ip_str = config.attribute_value("ip_addr", Str());
if (_dhcp && ip_str != "") {
_dhcp = false;
netif_set_down(&_netif);
Genode::error("refusing to configure lwIP interface with both DHCP and a static IPv4 address");
return;
}
netif_set_up(&_netif);
if (ip_str != "") {
ip_addr_t ipaddr;
if (!ipaddr_aton(ip_str.string(), &ipaddr)) {
Genode::error("lwIP configured with invalid IP address '",ip_str,"'");
throw ip_str;
}
if (IP_IS_V6_VAL(ipaddr)) {
netif_create_ip6_linklocal_address(&_netif, 1);
err_t err = netif_add_ip6_address(&_netif, ip_2_ip6(&ipaddr), NULL);
if (err != ERR_OK) {
Genode::error("failed to set lwIP IPv6 address to '",ip_str,"'");
throw err;
}
} else {
netif_set_ipaddr(&_netif, ip_2_ip4(&ipaddr));
netif_set_ipaddr(&_netif, ip_2_ip4(&ipaddr));
if (config.has_attribute("netmask")) {
Str str = config.attribute_value("netmask", Str());
ip_addr_t ip;
ipaddr_aton(str.string(), &ip);
netif_set_netmask(&_netif, ip_2_ip4(&ip));
}
if (config.has_attribute("gateway")) {
Str str = config.attribute_value("gateway", Str());
ip_addr_t ip;
ipaddr_aton(str.string(), &ip);
netif_set_gw(&_netif, ip_2_ip4(&ip));
}
/* inform DHCP servers of our fixed IP address */
dhcp_inform(&_netif);
if (config.has_attribute("netmask")) {
Str str = config.attribute_value("netmask", Str());
ip_addr_t ip;
ipaddr_aton(str.string(), &ip);
netif_set_netmask(&_netif, ip_2_ip4(&ip));
}
if (config.has_attribute("gateway")) {
Str str = config.attribute_value("gateway", Str());
ip_addr_t ip;
ipaddr_aton(str.string(), &ip);
netif_set_gw(&_netif, ip_2_ip4(&ip));
}
}
if (config.has_attribute("nameserver")) {
/*
* LwIP does not use DNS internally, but the application
* should expect "dns_getserver" to work regardless of
* how the netif configures itself.
*/
Str str = config.attribute_value("nameserver", Str());
ip_addr_t ip;
ipaddr_aton(str.string(), &ip);
dns_setserver(0, &ip);
}
handle_link_state();
}
Nic_netif(Genode::Env &env,
@ -228,11 +247,11 @@ class Lwip::Nic_netif
}
netif_set_default(&_netif);
netif_set_up(&_netif);
configure(config);
netif_set_status_callback(
&_netif, nic_netif_status_callback);
nic_netif_status_callback(&_netif);
configure(config);
}
virtual ~Nic_netif() { }