linuxkernel | Linux kernel utilities for Go
kandi X-RAY | linuxkernel Summary
kandi X-RAY | linuxkernel Summary
Utilities for interacting with the Linux kernel in various ways. For now, this package deals with kernel configuration files and kernel symbol tables. It’s a little bit of a mixed bag at the moment, and might be split up into multiple packages in the future, if necessary.
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- DiffConfig returns a diff of two config objects .
- ParseSymbols parses the given symbol file .
- parseConfigLine takes a line and returns the opt and value .
- ParseConfig takes a reader and returns a Config struct .
- Equal reports whether two configs are equal .
- Kallsyms returns a symbol table .
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QUESTION
I have been working on a program which uses a TUNTAP interface (in TUN mode) on a routing device which runs on top of the Linux kernel. It is a multicast tunneling protocol, and I am trying to send MLD joins to the kernel through my application so it can be recieved elsewhere. However, even though I have quadruple-checked my packets being sent on the interface, the linux kernel is dropping the packet before it gets passed on.
Tediously I have been tracing the path of the packet through the linuxkernel trying to figure out why it is being dropped and I think I have figured out to some extent why it is not being processed. The Hop-by-Hop options (containing the Router-Alert option which is necessary for MLD) is being parsed in net/ipv6/ip6_input.c in the ipv6_rcv function, but instead of continuing to process the packet in ip6_rcv_finish, the packet is dropped since the NF_HOOK at the end of the ipv6_rcv function is somehow interpreting the packet as being processed by something else. (NF_STOLEN instead of NF_ACCEPT)
Once the ipv6_rcv function finishes executing, something else executes ip6_mc_input, (in net/ipv6/ip6_input.c still) but from here the Hop-by-Hop options are not processed, which means when the kernel ends up processing the Layer-4 protocol, it has nothing to handle the protocol since the Hop-by-Hop options were meant to be processed beforehand. This means that the kernel drops the packet due to an unknown protocol.
What I am trying to figure out is what is calling ip6_mc_input. I have looked quite a bit on elixir for what could call it, but there are so many possibilities since it is called from a pointer in a rt6_info struct which is difficult to trace since so many things use it. Does anyone know anything that could help me in my search?
IGMP joins work fine, but the IPv4 stuff is probably quite similar so information from that context would probably be helpful too.
For reference, the linux kernel version in use is v4.4.6
...ANSWER
Answered 2020-Jan-28 at 23:31I figured out what was going on.
Using a macro that printed out the file location of the caller of the ip6_mc_input, i found that the packet came from my ipt_netmap.c file. It looks like the packet was being taken by the IPTables, which were not programmed to handle the hop options. It turns out I had a configuration option set which didn't need to be set though, so disabling that fixed the issue for me.
QUESTION
Following the Ditto Deployment Docker description. E.g. Adding a new password and then executing Docker compose command. Starting with clean Linuxmint 19.3 and new installed Docker and Docker-Compose setup. The localhost:8080 is reachable but fails to load API definition (Fetch error). Additionally I tried Hello World Example - Creating a Thing with adjusted Password set by me and I receive the 502 Gateway. In another Stackoverflow question 502 Bad Gateway nginx/1.13.12 on localhost while creating a new policy in ditto there was mentioned to check docker-compose ps therefore I tried to attach everything in the screenshot. As I said this is clean install Linuxmint 19.3 (Linuxkernel: 5.0.0-37-generic x86_64, + Docker (Docker version 19.03.5) + Docker-Compose (docker-compose version 1.25.0) and then followed the deployment instructions. Anyone has some hints what need to be configured or where I can find more information to that issue? Thank you!
[EDIT]: 27/12/2019 Setup - clean Ubuntu 1910 + Docker + Docker-compose - services are up and running -> Do not get the Fetch error in the browser anymore but still getting 502 Gateway from Nginx when trying to use the REST-API (using Postman - Ditto Profile) -> See Screenshot (e.g. Creating Things ->still using the Hello World Example).
[EDIT: 02.01.2020] NGINX-LOG:
...ANSWER
Answered 2020-Jan-02 at 12:40That sounds like a challenging problem to solve.
Based on the logs of the Ditto gateway service binding the Akka Artery inbound TCP streams times out:
QUESTION
I'm new to embedded programming and I apologise in advance for any confusion.
I need to handle multiple events from different devices connected to a gpio. These events need to be monitored continually. This means that after one event is generated and handled, the code needs to keep monitoring the device for other events.
I understand the concept of interruptions and polling in Linux (the kernel gets an interruption and dispatch it to the handler which goes on up to the callee of an epoll which is inside an infinite loop while(1)-like).
This is fine for one-time, single-event toy models. In a embedded system with limited resources such as the AT91SAM9x5 that runs at 400mhz and has 128mb of ram what can I do ? I believe that the while(1)-like pattern isn't the best choice. I've heard good things about thread pool solution but at the heart of each thread don't we find a while(1) ?
What are my options to attack this problem ?
Thank you in advance !
...ANSWER
Answered 2019-May-23 at 14:56It depends a lot on what is your application and what are your constrains but here are some of the common methods to monitor gpio pins for event
- In many of the newer controllers, all GPIO pins are capable of generating a combined interrupt. You can use this to trigger an ISR call on any change on any of the pins and then inside the ISR detect which specific pin triggered it.
- If there is nothing else your controller should be doing, then there is nothing wrong is a while(1) loop continuously monitoring all port pins and triggering relevant actions
- If none of the above solutions are acceptable, you can perhaps try to load a small OS like FreeRTOS on your controller and then use different tasks to monitor port pins
- A lighter version of the above method is to have a configure a timer interrupt and poll for all the port pins inside it. You can then save the state of pins in global variable and use that in the main loop to take relevant actions.
QUESTION
When I run make after creating this makefile from this website http://www.tldp.org/LDP/lkmpg/2.6/html/x181.html
When I run make in WSL I get make -C /lib/modules/4.4.0-17134-Microsoft/build M=/mnt/c/Users/tdwil/OneDrive/code/Documents/cfiles/systems/linuxkernel modules
make[1]: *** /lib/modules/4.4.0-17134-Microsoft/build: No such file or directory. Stop.
Makefile:5: recipe for target 'all' failed
make: *** [all] Error 2
Is this because make isn't possible in WSL? Or am I typing some directory wrong?
...ANSWER
Answered 2018-Nov-07 at 09:33First of all, you do not have Linux header on WSL. Another problem with Windows that Linux kernel have several file names which are differ in case.
It is better to compile kernel or kenel modules on Linux machines or VM.
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