malmert
e73726fd1b
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42 lines
931 B
C
42 lines
931 B
C
#include <linux/bpf.h>
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#include <linux/pkt_cls.h>
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#include <bpf/bpf_endian.h>
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#include <bpf/bpf_helpers.h>
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#define CAPTURE_MAGIC 0x4d544350
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#define CAPTURE_VERSION 1
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struct capture_header {
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__be32 magic;
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__u8 version;
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__u8 flags;
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__be16 header_len;
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__be32 skb_mark;
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__be32 aux_value;
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} __attribute__((packed));
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SEC("classifier")
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int prepend_capture_header_prog(struct __sk_buff *skb) {
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struct capture_header hdr = {
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.magic = bpf_htonl(CAPTURE_MAGIC),
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.version = CAPTURE_VERSION,
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.flags = 0,
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.header_len = bpf_htons(sizeof(struct capture_header)),
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.skb_mark = bpf_htonl(skb->mark),
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.aux_value = 0,
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};
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if (!skb->mark) {
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return TC_ACT_OK;
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}
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if (bpf_skb_adjust_room(skb, sizeof(hdr), BPF_ADJ_ROOM_MAC, 0)) {
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return TC_ACT_OK;
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}
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if (bpf_skb_store_bytes(skb, 0, &hdr, sizeof(hdr), 0)) {
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return TC_ACT_OK;
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}
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return TC_ACT_OK;
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}
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char LICENSE[] SEC("license") = "GPL";
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