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samples/bpf: refactor syscall tracing programs using BPF_KSYSCALL macro 

This commit refactors the syscall tracing programs by adopting the
BPF_KSYSCALL macro. This change aims to enhance the clarity and
simplicity of the BPF programs by reducing the complexity of argument
parsing from pt_regs.

Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Link: https://lore.kernel.org/r/20230818090119.477441-9-danieltimlee@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel T. Lee 2023-08-18 18:01:18 +09:00 committed by Alexei Starovoitov
parent d93a7cf6ca
commit 8dc8055146
1 changed files with 3 additions and 7 deletions
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10
samples/bpf/test_map_in_map.bpf.c
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@ -103,19 +103,15 @@ static __always_inline int do_inline_hash_lookup(void *inner_map, u32 port)
return result ? *result : -ENOENT;
}
SEC("kprobe/__sys_connect")
int trace_sys_connect(struct pt_regs *ctx)
SEC("ksyscall/connect")
int BPF_KSYSCALL(trace_sys_connect, unsigned int fd, struct sockaddr_in6 *in6, int addrlen)
{
struct sockaddr_in6 *in6;
u16 test_case, port, dst6[8];
int addrlen, ret, inline_ret, ret_key = 0;
int ret, inline_ret, ret_key = 0;
u32 port_key;
void *outer_map, *inner_map;
bool inline_hash = false;
in6 = (struct sockaddr_in6 *)PT_REGS_PARM2_CORE(ctx);
addrlen = (int)PT_REGS_PARM3_CORE(ctx);
if (addrlen != sizeof(*in6))
return 0;