diff options
author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2021-08-21 05:50:03 +0530 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2021-08-24 14:48:42 -0700 |
commit | 66fc4ca85d910bdeecf019c3999bc2df7c80b726 (patch) | |
tree | 876f438ed6c8027ff9dee479f886e3d89ebeecec /samples/bpf/xdp_redirect.bpf.c | |
parent | 6e1051a54e3100df59dae01c24ff4a6d6027e303 (diff) | |
download | linux-66fc4ca85d910bdeecf019c3999bc2df7c80b726.tar.bz2 |
samples: bpf: Convert xdp_redirect_kern.o to XDP samples helper
We moved swap_src_dst_mac to xdp_sample.bpf.h to be shared with other
potential users, so drop it while moving code to the new file.
Also, consistently use SEC("xdp") naming instead.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210821002010.845777-16-memxor@gmail.com
Diffstat (limited to 'samples/bpf/xdp_redirect.bpf.c')
-rw-r--r-- | samples/bpf/xdp_redirect.bpf.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/samples/bpf/xdp_redirect.bpf.c b/samples/bpf/xdp_redirect.bpf.c new file mode 100644 index 000000000000..7c02bacfe96b --- /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"; |