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- #include <linux/bpf.h>
- #include "bpf_helpers.h"
- #include "bpf_util.h"
- #include "bpf_endian.h"
- int _version SEC("version") = 1;
- #define bpf_printk(fmt, ...) \
- ({ \
- char ____fmt[] = fmt; \
- bpf_trace_printk(____fmt, sizeof(____fmt), \
- ##__VA_ARGS__); \
- })
- SEC("sk_msg1")
- int bpf_prog1(struct sk_msg_md *msg)
- {
- void *data_end = (void *)(long) msg->data_end;
- void *data = (void *)(long) msg->data;
- char *d;
- if (data + 8 > data_end)
- return SK_DROP;
- bpf_printk("data length %i\n", (__u64)msg->data_end - (__u64)msg->data);
- d = (char *)data;
- bpf_printk("hello sendmsg hook %i %i\n", d[0], d[1]);
- return SK_PASS;
- }
- char _license[] SEC("license") = "GPL";
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