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Add AutoIP option to network options for link local addressing #27048

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Add AutoIP option to network options for link local addressing #27048

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2 changes: 1 addition & 1 deletion libraries/AP_Networking/AP_Networking.cpp
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Expand Up @@ -89,7 +89,7 @@ const AP_Param::GroupInfo AP_Networking::var_info[] = {
// @Param: OPTIONS
// @DisplayName: Networking options
// @Description: Networking options
// @Bitmask: 0:EnablePPP Ethernet gateway
// @Bitmask: 0:EnablePPP Ethernet gateway,1:Enable AUTOIP (Link Local IPv4 Addressing)
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// @RebootRequired: True
// @User: Advanced
AP_GROUPINFO("OPTIONS", 9, AP_Networking, param.options, 0),
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15 changes: 15 additions & 0 deletions libraries/AP_Networking/AP_Networking.h
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Expand Up @@ -70,6 +70,20 @@ class AP_Networking
#endif
}


// returns true if AUTOIP is enabled
bool get_autoip_enabled() const
{
#if AP_NETWORKING_AUTOIP_AVAILABLE
return option_is_set(OPTION::AUTOIP);
#else
// AUTOIP is not available from our scope but could be enabled/controlled
// by the OS which is the case on Linux builds, including SITL
// TODO: ask the OS if link local IPv4 addressing is enabled
return false;
#endif
}

// Sets DHCP to be enabled or disabled
void set_dhcp_enable(const bool enable)
{
Expand Down Expand Up @@ -155,6 +169,7 @@ class AP_Networking

enum class OPTION {
PPP_ETHERNET_GATEWAY=(1U<<0),
AUTOIP=(1u<<1)
};
bool option_is_set(OPTION option) const {
return (param.options.get() & int32_t(option)) != 0;
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10 changes: 10 additions & 0 deletions libraries/AP_Networking/AP_Networking_ChibiOS.cpp
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Expand Up @@ -148,6 +148,11 @@ void AP_Networking_ChibiOS::link_up_cb(void *p)
if (driver->frontend.get_dhcp_enabled()) {
dhcp_start(driver->thisif);
}
# if LWIP_AUTOIP
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in lwipthread.c the lwipDefaultLinkUpCB/DownCB() functions perform the autoip before the dhcp. I don't think it matters but it would at least be nice to use the tested method that everyone else uses

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For sure, but I was just following the docs: https://lwip.fandom.com/wiki/AUTOIP

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@Ryanf55 Ryanf55 May 14, 2024 •
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Looking at the source code comments, there's a different recommendation:
https://github.com/ARMmbed/lwip/blob/4059748b4789fbda5970261bb075657565a1f381/src/core/ipv4/autoip.c#L22

Seems like we need to conditionally call autoip_start depending on if DHCP is enabled or not.
That said, the implementation already handles cleanly calling it mulitple times, so I don't see why we don't call this regardless, as long as it's enabled.

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@Ryanf55 Ryanf55 May 15, 2024 •
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If it's part of the default behavior, I would expect autoip to show up if DHCP is not available but enabled, but that's not the behavior I observe.

On master, with DHCP enabled, but no DHCP server, I observe no address reported in the console logs.
image
Because AP doesn't respond to broadcast, doesn't support MDNS, and doesn't log its current address, and the configured static address doesn't work when DHCP is enabled, I'm not quite sure what's going on.

if(driver->frontend.get_autoip_enabled()) {
autoip_start(driver->thisif);
}
#endif // LWIP_AUTOIP
#endif
}

Expand All @@ -158,6 +163,11 @@ void AP_Networking_ChibiOS::link_down_cb(void *p)
if (driver->frontend.get_dhcp_enabled()) {
dhcp_stop(driver->thisif);
}
# if LWIP_AUTOIP
if(driver->frontend.get_autoip_enabled()) {
autoip_stop(driver->thisif);
}
#endif // LWIP_AUTOIP
#endif
}

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3 changes: 3 additions & 0 deletions libraries/AP_Networking/AP_Networking_Config.h
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Expand Up @@ -65,6 +65,9 @@
#define AP_NETWORKING_DHCP_AVAILABLE (AP_NETWORKING_CONTROLS_HOST_IP_SETTINGS_ENABLED || AP_NETWORKING_BACKEND_CHIBIOS)
#endif

#ifndef AP_NETWORKING_AUTOIP_AVAILABLE
#define AP_NETWORKING_AUTOIP_AVAILABLE AP_NETWORKING_DHCP_AVAILABLE
#endif

// ---------------------------
// Below are default params
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