23 lines
580 B
C
23 lines
580 B
C
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// SPDX-License-Identifier: GPL-2.0
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/* fails to load without expected_attach_type = BPF_XDP_DEVMAP
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* because of access to egress_ifindex
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*/
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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SEC("xdp")
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int xdpdm_devlog(struct xdp_md *ctx)
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{
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char fmt[] = "devmap redirect: dev %u -> dev %u len %u\n";
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void *data_end = (void *)(long)ctx->data_end;
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void *data = (void *)(long)ctx->data;
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unsigned int len = data_end - data;
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bpf_trace_printk(fmt, sizeof(fmt),
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ctx->ingress_ifindex, ctx->egress_ifindex, len);
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return XDP_PASS;
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}
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char _license[] SEC("license") = "GPL";
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