The most basic helper to read a field in a CO-RE-relocatable manner isbpf_core_read(dst, sz, src), which will readszbytes from the field referenced bysrcinto the memory pointed to bydst: structtask_struct*task=(void*)bpf_get_current_task();structtask_struct*parent_task;interr;err=bpf...
从中我们可以看到CO-RE实现的首要条件是clang编译器需要记录被访问结构体成员的重定位信息,其次eBPF加载器读取eBPF程序的BTF信息和CO-RE重定位信息,与主机内核的BTF信息(通常就是我们的内核BTF文件)进行比较,并在需要时对指定的指令进行修补。修补后的程序会被加载和验证,以确保其在主机内核上的正确运行。这里,我们会...
BPF CO-RE提供了ignored suffix rule的功能,它的作用是对于任何的符号只要包含着三下划线,那么下划线以及它所有的字符都会被忽略。我们定义一个struct task_struct___my_own对于 BPF CO-RE而言,这完全地等价于struct task_struct。这是一个十分重要的特性意味着我们可以通过定义不同类型的结构体来处理不同版本的内核...
This post was originally posted on Facebook'sBPF blog. If you are curious about some of the new things that happened since BPF CO-RE got introduced initially, please see"BPF CO-RE as of 2021"section below. There is now also the"BPF CO-RE reference guide"with a lot of practical tips...
An important milestone is the completion of support for the compile once, run everywhere ("CO-RE") mechanism[3], which allows BPF code to run correctly on multiple versions of the kernel. The compiler now produces the necessary (for CO-RE) BPF type format (BTF) data by default when the...
bpf框架总结 libbpf bootstrap GitHub - libbpf/libbpf-bootstrap: Scaffolding for BPF application development with libbpf and BPF CO-RE Building BPF applications with libbpf-bootstrap core https://nakryiko.com/posts/bpf-core-reference-guide/
Linux bpf 3.2、BPF and XDP Reference Guide 开源软件Cilium深度的使用了BPF来做网络安全,它的文档中使用了一个章节专门的来介绍BPF的原理和使用。 参考原文:BPF and XDP Reference Guide 注意:本文档部分针对的是希望深入了解BPF和XDP的开发人员和用户。尽管阅读本参考指南可能有助于拓宽你对Cilium的理解,但使用...
References https://www.sartura.hr/blog/simple-ebpf-core-application/ repo: https://github.com/sartura/ebpf-hello-world BPF Documentation - kernel.org BPF CO-RE Reference Guide - nakryiko.comAboutAn example app for BPF CO-RE and CI settings with GitHub Actions Topics...
BPFTrace 更方便与编写单行的程序。BPFTrace 与 BCC 一样也是 IO Visor 组织下的项目,仓库参见bpftrace。更加深入的学习资料参见:Reference Guide和One-Liner Tutorial。 BPFTrace 使用 LLVM 将脚本编译成 BPF 二进制码,后续使用 BCC 与 Linux 内核进行交互。从功能层面上讲,BPFTrace 的定制性和灵活性不如 BCC,但是...
(maybe), gobpf, libbbpf-rs C, C++ New, lightweight, CO-RE & BTF based BPF Internals (Brendan Gregg) Requires LLVM; becoming obsolete / special-use only BPF Internals (developing BPF was hard; understanding it is easy) BPF Internals (Brendan Gregg) BPF tracing/observability high-level ...