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Questions tagged [netlink]

Netlink is a socket based inter process communication protocol for Linux systems. It is currently the preferred way, as of 2.6, of communicating with user space from the kernel.

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Where to find the source code of, for example, netlink?

I want to read the definition of those APIs of netlink, but I can only find header files like sys/socket.h, linux/netlink.h. Where can I find the .c files?
Warbean
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Unable to create netlink socket: Protocol not supported

I found an example about intercepting IPv6 packets using netfilter along with libipq library. It begins by declaring and creating an ipq_handle structure: struct ipq_handle *h; h = ipq_create_handle(0, NFPROTO_IPV6); if (!h) die(h); The…
Mouad
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netlink_unicast return errno -111 (Connection refused) in daemon mode

I have a Linux Kernel Module using Netlink in order to communicate with a daemon process running in the userspace. During the development phase I have always run the daemon executable like a normal process (without calling fork()) and all was…
ZedTuX
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libnl-3 includes broken?

I am trying to use libnl 3 (http://www.infradead.org/~tgr/libnl/) under Ubuntu to use netlink in order to get some information from the IPv6 Neighbour Cache. I am including a bunch of headers for this lib, but gcc already fails for the first…
Benjamin Maurer
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How to use netlink to monitor the kernel arp table in userspace deamon?

I know we can use 'NETLINK_ROUTE' socket with RTM_F_NOTIFY flag to notify user if route changes according to the RFC3549. But I can't find one method to notify the user when arp table changes. PS: I use linux kernel 3.0.6
neil
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Error in using .NETLink in Mathematica to invoke Matlab

I used before following code to call MATLAB from MATHEMATICA without any problem In[1]:= Needs["NETLink`"] matlab = CreateCOMObject["matlab.application"] But now i have an error like this: CreateCOMObject::netexcptn: "A .NET exception occurred:…
Jalil
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What do the types of hotplug event mean?

I am investigating hotplug events. Here's a tiny program to get and print them: #define _GNU_SOURCE #include #include #include #include #include #include #include…
DonDoerner
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Unable to Parse generic netlink message from recvfrom buffer

I am trying to get some events from kernel to User space via generic netlink family sockets. I have implemented the communication following this link and my user space callback is getting called. However I am getting segmentation fault when parsing…
RootPhoenix
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Sending netlink_multicast message from softirq context like netfilter hooks

I have registered a hook at the NF_NETDEV_INGRESS, very early in the network processing path and I am doing some filtering and based on match, I want to send a notification in user space. Since user space is listening and doesn't send data to…
RootPhoenix
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Get NIC stats using ethtool in Rust

I'm trying to fetch the stats of a NIC device in Rust, which is basically the equivalent of running ethtool -S eth0. I have been looking at the netlink interface for ethtool documentation and the existing libraries: neli and ethtool. However,…
mohitmayank
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how to delete interface using linux ioctl?

This link https://stackoverflow.com/a/25601662/5536829 tells how to delete interface in BSD operating system. struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); strcpy(ifr.ifr_name, "tun0"); int fd = socket(PF_INET, SOCK_STREAM, 0); ioctl(fd,…
Gary Allen
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Linux C get network interface's master interface

How would one get the master device of a network device they have an index of? I have looked into rtnetlink, but would prefer a simpler and more concise solution
Demiu
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Is there any way to get number of ipv4 forwarded packets via netlink?

i need a network routing statistics, and im using netlink for the interface statistics. I need the number of packets forwarded on an interface using netlink if it is posible, or can someone suggest another solution on how to get these counter…
pikimk
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netlink: set a flag and check for its value in userspace

I'm working on modifying the nbd driver in the Linux kernel (which needs to speak to a remote server) to add support for a new message type in the NBD protocol. Since the feature negotiation of nbd is done in userspace, and since the new message…
Wouter Verhelst
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Need to know more about IFLA_EVENT

The purpose of this thread is to validate if my statement is true or not. From what I have read from the little data present on the internet I found out that This IFLA_EVENT can detect any change in the network interface (IPv4/IPv6/interface…
Kivuos
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