| SIOCGIFNAME |
| | Given the ifr_ifindex, return the name of the interface in ifr_name. This is the only ioctl which returns its result in ifr_name. |
| SIOCGIFINDEX |
| | Retrieve the interface index of the interface into ifr_ifindex. |
| SIOCGIFFLAGS", "SIOCSIFFLAGS |
| | Get or set the active flag word of the device. ifr_flags contains a bitmask of the following values: | Device flags | | IFF_UP | Interface is running. | | IFF_BROADCAST | Valid broadcast address set. | | IFF_DEBUG | Internal debugging flag. | | IFF_LOOPBACK | Interface is a loopback interface. | | IFF_POINTOPOINT | Interface is a point-to-point link. | | IFF_RUNNING | Resources allocated. | | IFF_NOARP | No arp protocol, L2 destination address not set. | | IFF_PROMISC | Interface is in promiscuous mode. | | IFF_NOTRAILERS | Avoid use of trailers. | | IFF_ALLMULTI | Receive all multicast packets. | | IFF_MASTER | Master of a load balancing bundle. | | IFF_SLAVE | Slave of a load balancing bundle. | | IFF_MULTICAST | Supports multicast | | IFF_PORTSEL | Is able to select media type via ifmap. | | IFF_AUTOMEDIA | Auto media selection active. | | IFF_DYNAMIC | The addresses are lost when the interface goes down. | Setting the active flag word is a privileged operation, but any process may read it. |
| SIOCGIFMETRIC", "SIOCSIFMETRIC |
| | Get or set the metric of the device using ifr_metric. This is currently not implemented; it sets ifr_metric to 0 if you attempt to read it and returns EOPNOTSUPP if you attempt to set it. |
| SIOCGIFMTU", "SIOCSIFMTU |
| | Get or set the MTU (Maximum Transfer Unit) of a device using ifr_mtu. Setting the MTU is a privileged operation. Setting the MTU to too small values may cause kernel crashes. |
| SIOCGIFHWADDR", "SIOCSIFHWADDR |
| | Get or set the hardware address of a device using ifr_hwaddr. The hardware address is specified in a struct sockaddr. sa_family contains the ARPHRD_* device type, sa_data the L2 hardware address starting from byte 0. Setting the hardware address is a privileged operation. |
| SIOCSIFHWBROADCAST |
| | Set the hardware broadcast address of a device from ifr_hwaddr. This is a privileged operation. |
| 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;
};
The interpretation of the ifmap structure depends on the device driver and the architecture. |
| SIOCADDMULTI", "SIOCDELMULTI |
| | Add an address to or delete an address from the device’s link layer multicast filters using ifr_hwaddr. These are privileged operations. See also packet(7) for an alternative. |
| SIOCGIFTXQLEN", "SIOCSIFTXQLEN |
| | Get or set the transmit queue length of a device using ifr_qlen. Setting the transmit queue length is a privileged operation. |
| SIOCSIFNAME |
| | Changes the name of the interface specified in ifr_name to ifr_newname. This is a privileged operation. It is only allowed when the interface is not up. |
| SIOCGIFCONF |
| | Return a list of interface (transport layer) addresses. This currently means only addresses of the AF_INET (IPv4) family for compatibility. The user passes a ifconf structure as argument to the ioctl. It contains a pointer to an array of ifreq structures in ifc_req and its length in bytes in ifc_len. The kernel fills the ifreqs with all current L3 interface addresses that are running: ifr_name contains the interface name (eth0:1 etc.), ifr_addr the address. The kernel returns with the actual length in ifc_len. If ifc_len is equal to the original length the buffer probably has overflowed and you should retry with a bigger buffer to get all addresses. When no error occurs the ioctl returns 0; otherwise -1. Overflow is no error. |
|
Most protocols support their own ioctls to configure protocol specific interface options. See the protocol man pages for a description. For configuring IP addresses see 