diff options
| author | Lorenzo Bianconi <lorenzo@kernel.org> | 2022-05-25 12:44:27 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-17 16:14:25 +0300 |
| commit | 993b2d0ea0bd6c5693c4d38fdd93f786f118175b (patch) | |
| tree | ddb2fb6683e2cf951dc1010740e9252b04419f52 | |
| parent | a838592a9c492ba12d91c7c252899a49be8f4328 (diff) | |
| download | linux-993b2d0ea0bd6c5693c4d38fdd93f786f118175b.tar.xz | |
sample: bpf: xdp_router_ipv4: Allow the kernel to send arp requests
[ Upstream commit 200a89e3e88786b52bc1dd5f26a310c097f4c6a7 ]
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>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/60bde5496d108089080504f58199bcf1143ea938.1653471558.git.lorenzo@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | samples/bpf/xdp_router_ipv4.bpf.c | 9 |
1 files changed, 9 insertions, 0 deletions
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; + } } } |