| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* fails to load without expected_attach_type = BPF_XDP_DEVMAP |
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| 3 | * because of access to egress_ifindex |
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| 4 | */ |
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| 5 | #include <linux/bpf.h> |
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| 6 | #include <bpf/bpf_helpers.h> |
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| 7 | |
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| 8 | SEC("xdp" ) |
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| 9 | int xdpdm_devlog(struct xdp_md *ctx) |
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| 10 | { |
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| 11 | char fmt[] = "devmap redirect: dev %u -> dev %u len %u\n" ; |
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| 12 | void *data_end = (void *)(long)ctx->data_end; |
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| 13 | void *data = (void *)(long)ctx->data; |
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| 14 | unsigned int len = data_end - data; |
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| 15 | |
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| 16 | bpf_trace_printk(fmt, sizeof(fmt), |
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| 17 | ctx->ingress_ifindex, ctx->egress_ifindex, len); |
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| 18 | |
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| 19 | return XDP_PASS; |
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| 20 | } |
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| 21 | |
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| 22 | char _license[] SEC("license" ) = "GPL" ; |
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| 23 | |
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