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https://github.com/eunomia-bpf/bpf-developer-tutorial.git
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2cdcd8b0de
* Make tutorials 50-53 safer to operate * Make pacer conflict recovery interface-safe * Keep tutorial prose on the user path * Allow focused excerpts for long user-space loaders --------- Co-authored-by: LinuxDev9002 <i@littlefisher.me>
38 lines
685 B
C
38 lines
685 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_endian.h>
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#include <bpf/bpf_helpers.h>
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#ifndef TCX_NEXT
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#define TCX_NEXT -1
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#endif
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#ifndef TCX_PASS
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#define TCX_PASS 0
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#endif
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char LICENSE[] SEC("license") = "GPL";
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__u64 stats_hits;
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__u64 classifier_hits;
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__u32 last_len;
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__u16 last_protocol;
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__u32 last_ifindex;
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SEC("tcx/ingress")
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int tcx_stats(struct __sk_buff *skb)
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{
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__sync_fetch_and_add(&stats_hits, 1);
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last_len = skb->len;
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last_protocol = bpf_ntohs(skb->protocol);
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last_ifindex = skb->ifindex;
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return TCX_NEXT;
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}
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SEC("tcx/ingress")
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int tcx_classifier(struct __sk_buff *skb)
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{
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__sync_fetch_and_add(&classifier_hits, 1);
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return TCX_PASS;
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}
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