38 lines
1.2 KiB
ReStructuredText
38 lines
1.2 KiB
ReStructuredText
===========================
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"Raw" packet socket support
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===========================
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Packet sockets (:c:macro:`AF_PACKET`) allow receiving and transmitting frames
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without a transport protocol in between. Frames received are copied into a
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packet socket tap before they enter the network. Data written into a packet
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socket will bypass the network altogether and be placed in the transmission
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buffer of the network interface driver.
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Configuration Options
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=====================
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``CONFIG_NET_PKT_PREALLOC_CONNS``
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Number of preallocated packet connections (all tasks).
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``CONFIG_NET_PKT_ALLOC_CONNS``
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Dynamic memory allocations for packet connections.
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``CONFIG_NET_PKT_MAX_CONNS``
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Maximum number of packet connections.
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Usage
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=====
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.. code-block:: c
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struct sockaddr_ll addr;
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uint8_t buffer[BUFSIZE];
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int sd = socket(AF_PACKET, SOCK_RAW, 0); /* Create a packet socket */
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addr.sll_family = AF_PACKET;
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addr.sll_ifindex = if_nametoindex("eth0");
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bind(sd, (FAR struct sockaddr *)&addr, sizeof(addr)); /* Bind to device */
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recv(sd, buffer, sizeof(buffer), 0); /* read(sd, buffer, sizeof(buffer)); */
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send(sd, buffer, sizeof(buffer), 0); /* write(sd, buffer, sizeof(buffer)); */
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close(sd); /* Close the socket */
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