=========================== "Raw" packet socket support

Packet sockets (:c:macro:AF_PACKET) allow receiving and transmitting frames without a transport protocol in between. Frames received are copied into a packet socket tap before they enter the network. Data written into a packet socket will bypass the network altogether and be placed in the transmission buffer of the network interface driver.

Configuration Options

CONFIG_NET_PKT_PREALLOC_CONNS Number of preallocated packet connections (all tasks). CONFIG_NET_PKT_ALLOC_CONNS Dynamic memory allocations for packet connections. CONFIG_NET_PKT_MAX_CONNS Maximum number of packet connections.

Usage

.. code-block:: c

struct sockaddr_ll addr; uint8_t buffer[BUFSIZE]; int sd = socket(AF_PACKET, SOCK_RAW, 0); /* Create a packet socket */

addr.sll_family = AF_PACKET; addr.sll_ifindex = if_nametoindex("eth0"); addr.sll_protocol = htons(ETH_P_ALL); bind(sd, (FAR struct sockaddr )&addr, sizeof(addr)); / Bind to device */

recv(sd, buffer, sizeof(buffer), 0); /* read(sd, buffer, sizeof(buffer)); / send(sd, buffer, sizeof(buffer), 0); / write(sd, buffer, sizeof(buffer)); */

close(sd); /* Close the socket */