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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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android vold mechanism in the main function

By going through the code of vold, I found there are a couple of lines of code in main.cpp (system/vold/main.cpp) that I dont get the real function of these. Those are.. 1. vm->setBroadcaster((SocketListener *)…
Sam
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Netlink sockets does not add routes to routing table for IPv6

I want to be able to add a new IPv6 address but have not been able to so far..The program runs with success but nothing is reflected in the routing table. #include #include #include #include…
Akshay
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netlink scatter send causes error response from kernel (NLMSG_ERROR)

I'm writing a program that uses the Netlink protocol to gather task statistics. I'm not getting very far because the kernel responds with an error to what I believe is a valid packet. I've used strace to compare the behaviour of my program with that…
Nicole
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netlink socket event listener in kernel

I am using netlink socket to communicate between user space application and a kernel module. However I want to stop routing data from kernel to the user app when the user app closes. Is there a way to get an event in kernel, when a process using…
Anup Warnulkar
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Send data to kernel using genetlink

Up until now, I've used Genetlink to enable users to send my module some basic commands, with no parameters needed. Times have changed and I need to enable the users to add some more data to the message. Specifically, I need them to be able to send…
Noich
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how to add command in nl80211 interface

I want to add a new command in nl80211 interface. i browsed but didnt get information in much details. As far as i know, for adding command we need to add command in enum nl80211_commands present in /usr/include/linux/nl80211.h file line 515, and we…
Rafal
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Adding route with libnl-3-route "Invalid input data or parameter"

I'm trying to adding route (kernel 2.6.32-57) with libnl-3-routing. I use the documentation : Netlink library Netlink routing But the routing chapter is empty... ;) The problem is the kernel response with "Invalid input data or parameter". I have…
Manticore
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Kernel as client, User application as server using netlink

I want to establish connection between kernel module and user application with the kernel as a client. In other words, kernel will send message to the user app, wait for reply, receive reply, and then continue execution. For example, inside kernel…
Isa A
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An error while attempting to write a netlink socket program in C

First thing's first, you can find the details of my situation from my previous post I've spent the past day or so working on a first attempt on a netlink socket program. And I don't attempt to make it sound like I didn't get all this code from other…
thewill2live
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Size of data send via NetLink

I'm trying to get the size of a chunk of data sent via NetLink (Linux Kernel). I have tried with size = nlh->nlmsg_len - NLMSG_HDRLEN, but that isn't returning the correct size. What's the correct way to get the message's data size?
alexandernst
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sendmsg causing kernel panic

I tried below program using Netlink sockets and it worked like a charm. Src : http://binwaheed.blogspot.in/2010/08/after-reading-kernel-source-i-finally.html Kernel Module #include #include #include…
user1227554
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Closing telnet session will redirect the stdout to a http socket

I have a program that display the log output to the stdout. So if I open a telnet session to my target linux and then launch on this telnet session my program then I will get the log messages displayed on my telnet session. In my program I have a…
MOHAMED
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Problems with netlink socket, kernel opps 0002

I try to send some data from user mode to my kernel module. But when it send something, it triggers a kernel error: Bug:unable to handle kernel paging request ad ffff88022f168bc0 IP: [<...>]build_skb+0xf5/0x1c0 #include "socket.hpp" using namespace…
Yifan Sun
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How to get network link L2 address via netlink?

I'm using netlink to get interfaces, its names, types etc. but I can't get L2 address (ugly_data is nlmsghdr*): struct ifinfomsg *iface; struct rtattr *attribute; int len; iface = (struct ifinfomsg *) NLMSG_DATA(ugly_data); len =…
Frederic Blase
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Knowing the interface that caused a link status change in netlink

I have written a program using Netlink sockets. I am able to successfully detect the link status change (i.e., when the network cable is plugged/unplugged). But in both the cases I am getting a RTM_NEWLINK event. I thought I could query the…
Thomas
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