Support SIOCGIF* netdevice ioctls

[ianlewis]

This issue is to support the following netdevice ioctls.
SIOCGIFMAP
SIOCGIFTXQLEN
SIOCGIFDSTADDR
SIOCGIFBRDADDR

[MatthewHinton56]

Hey I want to take a look at this as a first issue. Is it available, and if so what files should I direct my attention to?

[hbhasker]

from: https://linux.die.net/man/7/netdevice

SIOCGIFMAP, SIOCSIFMAP
Get or set the interface's hardware parameters using ifr_map. Setting the parameters is a privileged operation.

struct ifmap {
    unsigned long   mem_start;
    unsigned long   mem_end;
    unsigned short  base_addr;
    unsigned char   irq;
    unsigned char   dma;
    unsigned char   port;
};

we don't have a hardware interface so not sure it makes sense to implement this

same with SIOCGIFTXQLEN, SIOCSIFTXQLEN
Get or set the transmit queue length of a device using ifr_qlen. Setting the transmit queue length is a privileged operation.
our internal NIC's don't really have a TX queue
the veth device itself does I guess we could propagate that but in other types of endpoints we don't have a tx queue.

I guess in runsc under docker we could support the following ones by querying the underlying veth device etc. But needs a bit more thought.

SIOCGIFDSTADDR, SIOCSIFDSTADDR
Get or set the destination address of a point-to-point device using ifr_dstaddr. For compatibility, only AF_INET addresses are accepted or returned. Setting the destination address is a privileged operation.

SIOCGIFBRDADDR, SIOCSIFBRDADDR
Get or set the broadcast address for a device using ifr_brdaddr. For compatibility, only AF_INET addresses are accepted or returned. Setting the broadcast address is a privileged operation.

[hbhasker]

@ianlewis do we have an actual request to support these?

[ianlewis]

@hbhasker I believe at the time I was migrating an internal issue we had TODOs for. So no specific request.