* [PATCH bpf-next] sample: bpf: xdp_router_ipv4: allow the kernel to send arp requests
@ 2022-05-25 9:44 Lorenzo Bianconi
2022-05-31 22:50 ` patchwork-bot+netdevbpf
0 siblings, 1 reply; 2+ messages in thread
From: Lorenzo Bianconi @ 2022-05-25 9:44 UTC (permalink / raw)
To: bpf; +Cc: ast, daniel, andrii, netdev, lorenzo.bianconi
Forward the packet to the kernel if the gw router mac address is missing
in to trigger ARP discovery.
Fixes: 85bf1f51691c ("samples: bpf: Convert xdp_router_ipv4 to XDP samples helper")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel•org>
---
samples/bpf/xdp_router_ipv4.bpf.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/samples/bpf/xdp_router_ipv4.bpf.c b/samples/bpf/xdp_router_ipv4.bpf.c
index 248119ca7938..0643330d1d2e 100644
--- a/samples/bpf/xdp_router_ipv4.bpf.c
+++ b/samples/bpf/xdp_router_ipv4.bpf.c
@@ -150,6 +150,15 @@ int xdp_router_ipv4_prog(struct xdp_md *ctx)
dest_mac = bpf_map_lookup_elem(&arp_table,
&prefix_value->gw);
+ if (!dest_mac) {
+ /* Forward the packet to the kernel in
+ * order to trigger ARP discovery for
+ * the default gw.
+ */
+ if (rec)
+ NO_TEAR_INC(rec->xdp_pass);
+ return XDP_PASS;
+ }
}
}
--
2.35.3
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH bpf-next] sample: bpf: xdp_router_ipv4: allow the kernel to send arp requests
2022-05-25 9:44 [PATCH bpf-next] sample: bpf: xdp_router_ipv4: allow the kernel to send arp requests Lorenzo Bianconi
@ 2022-05-31 22:50 ` patchwork-bot+netdevbpf
0 siblings, 0 replies; 2+ messages in thread
From: patchwork-bot+netdevbpf @ 2022-05-31 22:50 UTC (permalink / raw)
To: Lorenzo Bianconi; +Cc: bpf, ast, daniel, andrii, netdev, lorenzo.bianconi
Hello:
This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel•org>:
On Wed, 25 May 2022 11:44:27 +0200 you wrote:
> Forward the packet to the kernel if the gw router mac address is missing
> in to trigger ARP discovery.
>
> Fixes: 85bf1f51691c ("samples: bpf: Convert xdp_router_ipv4 to XDP samples helper")
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel•org>
> ---
> samples/bpf/xdp_router_ipv4.bpf.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
Here is the summary with links:
- [bpf-next] sample: bpf: xdp_router_ipv4: allow the kernel to send arp requests
https://git.kernel.org/bpf/bpf-next/c/4c7cbcc9c097
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
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2022-05-25 9:44 [PATCH bpf-next] sample: bpf: xdp_router_ipv4: allow the kernel to send arp requests Lorenzo Bianconi
2022-05-31 22:50 ` patchwork-bot+netdevbpf
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