[PR #1083] [MERGED] DNS forwarder and common ebpf loader #13295

New Issue

saavagebueno · 2026-08-05T02:08:02-04:00

saavagebueno commented

2026-08-05 02:08:02 -04:00

📋 Pull Request Information

Original PR: https://github.com/netbirdio/netbird/pull/1083
Author: @pappz
Created: 8/15/2023
Status: ✅ Merged
Merged: 9/5/2023
Merged by: @mlsmaycon

Base: main ← Head: common-ebpf-loader

📝 Commits (10+)

f185107 Add forwarder logic
32b7ced Fix build without import C
23a6d7e Fix map reading
666ecc5 Add singleton eBPF loader
4b73828 Fix order of ports
5288506 Fix runtime/listen port logic
9628839 Clarify variable and func names
5687951 Fix eBPF apply logic
1c84d6b Avoid ebpf lib usage on non Linux
7bf5c6b Fix error handling in attach

📊 Changes

23 files changed (+554 additions, -214 deletions)

View changed files

📝 client/internal/dns/server.go (+1 -1)
📝 client/internal/dns/service_listener.go (+56 -8)
📝 client/internal/ebpf/ebpf/bpf_bpfeb.go (+12 -3)
➕ client/internal/ebpf/ebpf/bpf_bpfeb.o (+0 -0)
📝 client/internal/ebpf/ebpf/bpf_bpfel.go (+12 -3)
➕ client/internal/ebpf/ebpf/bpf_bpfel.o (+0 -0)
➕ client/internal/ebpf/ebpf/dns_fwd_linux.go (+51 -0)
➕ client/internal/ebpf/ebpf/manager_linux.go (+116 -0)
➕ client/internal/ebpf/ebpf/manager_linux_test.go (+40 -0)
➕ client/internal/ebpf/ebpf/src/dns_fwd.c (+64 -0)
➕ client/internal/ebpf/ebpf/src/prog.c (+66 -0)
➕ client/internal/ebpf/ebpf/src/wg_proxy.c (+54 -0)
➕ client/internal/ebpf/ebpf/wg_proxy_linux.go (+41 -0)
➕ client/internal/ebpf/instantiater_linux.go (+15 -0)
➕ client/internal/ebpf/instantiater_nonlinux.go (+10 -0)
➕ client/internal/ebpf/manager/manager.go (+9 -0)
➖ client/internal/wgproxy/ebpf/bpf_bpfeb.o (+0 -0)
➖ client/internal/wgproxy/ebpf/bpf_bpfel.o (+0 -0)
➖ client/internal/wgproxy/ebpf/loader.go (+0 -84)
➖ client/internal/wgproxy/ebpf/loader_test.go (+0 -18)

...and 3 more files

📄 Description

Describe your changes

This PR contains multiple modifications.

In case the 53 UDP port is not option to bind then we hijack the DNS traffic with eBPF and we forward the traffic to the listener on a custom port. With this implementation we should be able to listen DNS queries on any address and still set the local host system to send queries to the custom address on port 53.

Because we tried to attach multiple xdp program to the same interface I did a refactor in the WG traffic forward code also.

Issue ticket number and link

NB-282

Checklist

Is it a bug fix
Is a typo/documentation fix
Is a feature enhancement
It is a refactor
Created tests that fail without the change (if possible)
Extended the README / documentation, if necessary

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/netbirdio/netbird/pull/1083 **Author:** [@pappz](https://github.com/pappz) **Created:** 8/15/2023 **Status:** ✅ Merged **Merged:** 9/5/2023 **Merged by:** [@mlsmaycon](https://github.com/mlsmaycon) **Base:** `main` ← **Head:** `common-ebpf-loader` --- ### 📝 Commits (10+) - [`f185107`](https://github.com/netbirdio/netbird/commit/f18510726850c78711d7b41397a82f700dbf0dac) Add forwarder logic - [`32b7ced`](https://github.com/netbirdio/netbird/commit/32b7ced0f8fb79cc2afb0d80ac4802668b534d82) Fix build without import C - [`23a6d7e`](https://github.com/netbirdio/netbird/commit/23a6d7e5a9e8694db194d84b812bad4228934797) Fix map reading - [`666ecc5`](https://github.com/netbirdio/netbird/commit/666ecc580f55e7f6230a157cfc914b38832ca701) Add singleton eBPF loader - [`4b73828`](https://github.com/netbirdio/netbird/commit/4b73828c6dacecc2dca8e11e609c1253963a5f2c) Fix order of ports - [`5288506`](https://github.com/netbirdio/netbird/commit/5288506c90909d140673a0ac427c847af12ffd57) Fix runtime/listen port logic - [`9628839`](https://github.com/netbirdio/netbird/commit/9628839508c2df900b05aae8fc8b65b209fa516b) Clarify variable and func names - [`5687951`](https://github.com/netbirdio/netbird/commit/56879517f1cb731b237a7420fc8e458b2d9ea9a7) Fix eBPF apply logic - [`1c84d6b`](https://github.com/netbirdio/netbird/commit/1c84d6b3b6df733111f4d20b57e8c3ce674be437) Avoid ebpf lib usage on non Linux - [`7bf5c6b`](https://github.com/netbirdio/netbird/commit/7bf5c6bd53989f36ede8c95291489cd793488098) Fix error handling in attach ### 📊 Changes **23 files changed** (+554 additions, -214 deletions) <details> <summary>View changed files</summary> 📝 `client/internal/dns/server.go` (+1 -1) 📝 `client/internal/dns/service_listener.go` (+56 -8) 📝 `client/internal/ebpf/ebpf/bpf_bpfeb.go` (+12 -3) ➕ `client/internal/ebpf/ebpf/bpf_bpfeb.o` (+0 -0) 📝 `client/internal/ebpf/ebpf/bpf_bpfel.go` (+12 -3) ➕ `client/internal/ebpf/ebpf/bpf_bpfel.o` (+0 -0) ➕ `client/internal/ebpf/ebpf/dns_fwd_linux.go` (+51 -0) ➕ `client/internal/ebpf/ebpf/manager_linux.go` (+116 -0) ➕ `client/internal/ebpf/ebpf/manager_linux_test.go` (+40 -0) ➕ `client/internal/ebpf/ebpf/src/dns_fwd.c` (+64 -0) ➕ `client/internal/ebpf/ebpf/src/prog.c` (+66 -0) ➕ `client/internal/ebpf/ebpf/src/wg_proxy.c` (+54 -0) ➕ `client/internal/ebpf/ebpf/wg_proxy_linux.go` (+41 -0) ➕ `client/internal/ebpf/instantiater_linux.go` (+15 -0) ➕ `client/internal/ebpf/instantiater_nonlinux.go` (+10 -0) ➕ `client/internal/ebpf/manager/manager.go` (+9 -0) ➖ `client/internal/wgproxy/ebpf/bpf_bpfeb.o` (+0 -0) ➖ `client/internal/wgproxy/ebpf/bpf_bpfel.o` (+0 -0) ➖ `client/internal/wgproxy/ebpf/loader.go` (+0 -84) ➖ `client/internal/wgproxy/ebpf/loader_test.go` (+0 -18) _...and 3 more files_ </details> ### 📄 Description ## Describe your changes This PR contains multiple modifications. In case the 53 UDP port is not option to bind then we hijack the DNS traffic with eBPF and we forward the traffic to the listener on a custom port. With this implementation we should be able to listen DNS queries on any address and still set the local host system to send queries to the custom address on port 53. Because we tried to attach multiple xdp program to the same interface I did a refactor in the WG traffic forward code also. ## Issue ticket number and link NB-282 ### Checklist - [ ] Is it a bug fix - [ ] Is a typo/documentation fix - [x] Is a feature enhancement - [x] It is a refactor - [ ] Created tests that fail without the change (if possible) - [ ] Extended the README / documentation, if necessary --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

saavagebueno added the pull-request label 2026-08-05 02:08:02 -04:00

saavagebueno closed this issue

2026-08-05 03:08:41 -04:00

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No dependencies set.

Reference: DYNR/netbird#13295