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Add better support for XDP program chaining #24

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Merged
gamemann merged 1 commit into from
Dec 28, 2025
Merged

Add better support for XDP program chaining #24

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11 changes: 10 additions & 1 deletion src/common/config.h
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Original file line number Diff line number Diff line change
Expand Up @@ -36,4 +36,13 @@

// If enabled, uses a newer bpf_loop() function when choosing a source port for a new connection.
// This allows for a much higher source port range. However, it requires a more recent kernel.
#define USE_NEW_LOOP
#define USE_NEW_LOOP

// Whether to enable chaining multiple XDP programs with this tool (1 = enable. 0 = disable).
#define XDP_MULTIPROG_ENABLED 1

// The XDP program's run priority (used for running multiple XDP programs together).
#define XDP_MULTIPROG_PRIORITY 20

// The action that indicates it should go onto the next program (default XDP_PASS).
#define XDP_MULTIPROG_ACTION XDP_PASS
4 changes: 4 additions & 0 deletions src/loader/utils/xdp.c
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Expand Up @@ -113,6 +113,10 @@ int attach_xdp(struct xdp_program *prog, char** mode, int ifidx, int detach, int
{
int err;

// Before attaching, set chaining options.
xdp_program__set_run_prio(prog, XDP_MULTIPROG_PRIORITY);
xdp_program__set_chain_call_enabled(prog, XDP_MULTIPROG_ACTION, XDP_MULTIPROG_ENABLED);

u32 attach_mode = XDP_MODE_NATIVE;

*mode = "DRV/native";
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