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NG_DEVICE(4) Kernel Interfaces Manual NG_DEVICE(4) NAME ng_device -- device netgraph node type SYNOPSIS #include <netgraph/ng_device.h> DESCRIPTION A device node is both a netgraph node and a system device interface. When a device node is created, a new device entry appears which is ac- cessible via the regular file operators such as open(2), close(2), read(2), write(2), etc. The first node is created as /dev/ngd0, subsequent nodes are /dev/ngd1, /dev/ngd2, etc. HOOKS A device node has a single hook with an arbitrary name. All data com- ing in over the hook will be presented to the device for read(2). All data coming in from the device entry by write(2) will be forwarded to the hook. CONTROL MESSAGES The device node supports the generic control messages, plus the follow- ing: NGM_DEVICE_GET_DEVNAME Returns the device name corresponding to the node. NGM_DEVICE_ETHERALIGN Apply the system ETHER_ALIGN offset to mbufs sent out the node's hook, if running on an architecture that requires strict align- ment. Use this option when the data being injected via the device node ultimately ends up being fed into the protocol stack as eth- ernet packets (e.g., via an ng_eiface(4) node). SHUTDOWN This node shuts down upon receipt of a NGM_SHUTDOWN control message, or upon hook disconnection. The associated device entry is removed and becomes available for use by future device nodes. SEE ALSO netgraph(4), ngctl(8) HISTORY The device node type was first implemented in FreeBSD 5.0. AUTHORS Mark Santcroos <marks@ripe.net> Gleb Smirnoff <glebius@FreeBSD.org> FreeBSD 14.3 November 8, 2021 NG_DEVICE(4)
NAME | SYNOPSIS | DESCRIPTION | HOOKS | CONTROL MESSAGES | SHUTDOWN | SEE ALSO | HISTORY | AUTHORS
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