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0 answers
20 views

I'm learning eBPF and I want to use it for connection load balancing. Let's say I have two threads sharing the same socket with SO_REUSEPORT and SO_ATTACH_REUSEPORT_EBPF. I managed to attach an eBPF ...
0 votes
0 answers
48 views

I wrote an XDP program in C that saves every packet, except some blocked ones, into a ring buffer map, which is sent to userspace. I also made an xdp_loader program in C++ that loads the XDP program ...
Roei's user avatar
  • 33
2 votes
1 answer
46 views

BPF_LINK_CREATE with BPF_LINK_TYPE_XDP + target_ifindex returns -EINVAL on Ubuntu 24.04 HWE (6.14.0-36-generic, i40e). Documentation I’m trying to attach an XDP program to a NIC using BPF_LINK_CREATE ...
1 vote
0 answers
52 views

I have two k8s pods that communicate using TLS. I am loading an eBPF TC code on the egress of the sender pod. This code adds 28 bytes to the optional space of the TCP headers after TCP options. If I ...
0 votes
1 answer
143 views

I am trying to implement a manual implementation of strstr in eBPF but cannot get past verifier. Before starting, I know there is an existing bpf_strstr() implementation, but it's on 6.17+ linux ...
1 vote
1 answer
37 views

I'm working on an LSM BPF program and running into an issue with bpf_task_storage_get. Here’s a minimal example that works: struct provenance_structure { __u8 to_trace; struct bpf_spin_lock ...
Polo's user avatar
  • 147
1 vote
1 answer
100 views

Below is the code attached to sched_process_fork tracepoint for tracking process forks. // fork.bpf.c // clang -O2 -target bpf -c fork.bpf.c -o fork.bpf.o #include <linux/bpf.h> #include <...
0 votes
0 answers
40 views

Is it possible to store a pointer to an MAP entry (PTR_TO_MAP) in another MAP and use it later, potentially in another eBPF program? If not, what kind of support is needed for this to work? I am ...
2 votes
0 answers
419 views

I'm running Ubuntu 24.04 LTS with kernel 6.14.0-32-generic and trying to use bpftool for eBPF dev. After some struggling in setting up, I realized that the linux-tools-6.14.0-32-generic package is ...
1 vote
1 answer
54 views

I have a bound check statement that is optimized by clang and as a result verifier doesn't accept the program. I would like to write it using embedded assembly. I am not sure how to do it. I know that ...
-4 votes
1 answer
54 views

Can we attach a ebpf program after tcp reordering? What mechanism should we use any ready examples folks? We tried at tc level but see problems of packets not being ordered/assembled as expected! ...
1 vote
1 answer
147 views

Can somebody help me with retrieving name of file using eBPF when file is creating? What I’ve done: We have 2 funcs (helper and Kfunc) for collecting filepath from struct path: bpf_d_path & ...
2 votes
0 answers
125 views

Wrote an eBPF code to count cache refs and miss of a target process. The program seems to work, albeit the counts dont match even closely to the perf stat output. I am assuming there is some issue ...
2 votes
1 answer
91 views

I was attempting Experiment 2 specified on the site, which involves modifying the first parameter (the file path of the executed program) in the sys_enter_execvfunction. However, when I called ...
C JH's user avatar
  • 23
0 votes
0 answers
49 views

I was trying to write a simple bpftrace script to check if (Tcl) functions call themselves recursively and I got unexpected results. To investigate, I simplified the script to: uprobe:/usr/lib64/...

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