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https://github.com/apache/nuttx.git
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zhanghongyu
1fd47357f7
Some third-party network libraries use PACKET_ADD_MEMBERSHIP to add MAC addresses to devices, and this patch can add support for this. Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
81 lines
2.6 KiB
ReStructuredText
81 lines
2.6 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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``CONFIG_NET_PKT_WRITE_BUFFERS``
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Use write buffers for packet sockets, support SOCK_NONBLOCK mode.
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``CONFIG_NET_PKTPROTO_OPTIONS``
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Enable setting protocol options on packet sockets.
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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 Raw 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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addr.sll_protocol = htons(ETH_P_ALL);
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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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.. 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_DGRAM, 0); /* Create a Dgram 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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addr.sll_protocol = htons(ETH_P_IP);
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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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memset(addr.sll_addr, 0xff, sizeof(addr.sll_addr)); /* Destination MAC address */
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addr.sll_halen = ETH_ALEN;
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sendto(sd, buffer, sizeof(buffer), 0, /* SOCK_DGRAM can not use write() */
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(struct sockaddr *)&addr, sizeof(addr));
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close(sd); /* Close the socket */
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.. code-block:: c
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int sd;
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struct packet_mreq mreq;
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char macaddr[ETH_ALEN] = {0x91, 0xe0, 0xf0, 0x00, 0x0e, 0x01};
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sd = socket(AF_PACKET, SOCK_RAW, 0);
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mreq.mr_ifindex = if_nametoindex("eth0");
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mreq.mr_type = PACKET_MR_MULTICAST;
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mreq.mr_alen = ETH_ALEN;
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memcpy(&mreq.mr_address, macaddr, ETH_ALEN);
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setsockopt(sd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq,
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sizeof(struct packet_mreq));
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close(sd);
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