Merge tag 'net-next-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev...

[sfrench/cifs-2.6.git] / samples / bpf / xdp_redirect.bpf.c

diff --git a/samples/bpf/xdp_redirect.bpf.c b/samples/bpf/xdp_redirect.bpf.c
new file mode 100644 (file)
index 0000000..7c02bac
--- /dev/null
+++ b/samples/bpf/xdp_redirect.bpf.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2016 John Fastabend <john.r.fastabend@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include "vmlinux.h"
+#include "xdp_sample.bpf.h"
+#include "xdp_sample_shared.h"
+
+const volatile int ifindex_out;
+
+SEC("xdp")
+int xdp_redirect_prog(struct xdp_md *ctx)
+{
+       void *data_end = (void *)(long)ctx->data_end;
+       void *data = (void *)(long)ctx->data;
+       u32 key = bpf_get_smp_processor_id();
+       struct ethhdr *eth = data;
+       struct datarec *rec;
+       u64 nh_off;
+
+       nh_off = sizeof(*eth);
+       if (data + nh_off > data_end)
+               return XDP_DROP;
+
+       rec = bpf_map_lookup_elem(&rx_cnt, &key);
+       if (!rec)
+               return XDP_PASS;
+       NO_TEAR_INC(rec->processed);
+
+       swap_src_dst_mac(data);
+       return bpf_redirect(ifindex_out, 0);
+}
+
+/* Redirect require an XDP bpf_prog loaded on the TX device */
+SEC("xdp")
+int xdp_redirect_dummy_prog(struct xdp_md *ctx)
+{
+       return XDP_PASS;
+}
+
+char _license[] SEC("license") = "GPL";