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Filename : sysc_accept4.stp
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# accept4 ____________________________________________________
#
# SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
#		  int __user *, upeer_addrlen, int, flags)
#

@define _SYSCALL_ACCEPT4_NAME
%(
	name = "accept4"
%)

@define _SYSCALL_ACCEPT4_ARGSTR
%(
	argstr = sprintf("%d, %p, %p, %s", sockfd, addr_uaddr, addrlen_uaddr,
			 flags_str)
%)

@define _SYSCALL_ACCEPT4_REGARGS
%(
	sockfd = int_arg(1)
	addr_uaddr = pointer_arg(2)
	addrlen_uaddr = pointer_arg(3)
	flags = int_arg(4)
%)

@define _SYSCALL_SOCKETCALL_ACCEPT4_REGARGS
%(
	__args = &@ulong_cast(pointer_arg(2))
	sockfd = __int32(user_ulong(&@ulong_cast(__args)[0]))
	addr_uaddr = user_ulong(&@ulong_cast(__args)[1])
	addrlen_uaddr = user_ulong(&@ulong_cast(__args)[2])
	flags = __int32(user_ulong(&@ulong_cast(__args)[3]))
%)

@define _SYSCALL_COMPAT_SOCKETCALL_ACCEPT4_REGARGS
%(
	__args = &@uint_cast(pointer_arg(2))
	sockfd = user_int(&@uint_cast(__args)[0])
	addr_uaddr = user_uint32(&@uint_cast(__args)[1])
	addrlen_uaddr = user_uint32(&@uint_cast(__args)[2])
	flags = user_int(&@uint_cast(__args)[3])
%)

probe syscall.accept4 = dw_syscall.accept4 !, nd_syscall.accept4 ? {}
probe syscall.accept4.return = dw_syscall.accept4.return !, nd_syscall.accept4.return ? {}

# dw_accept4 _____________________________________________________

probe dw_syscall.accept4 = __syscall.accept4 ?, __syscall.socketcall.accept4 ?,
	__syscall.compat_socketcall.accept4 ?
{
	@_SYSCALL_ACCEPT4_NAME
	flags_str = _sock_flags_str(flags)
	@_SYSCALL_ACCEPT4_ARGSTR
}
probe __syscall.accept4 = kernel.function("sys_accept4").call
{
	// On all tested platforms, there wasn't a different syscall
	// number for the compat version of accept4().
	@__syscall_nr_gate(@const("__NR_accept4"))
	sockfd = __int32($fd)
	addr_uaddr = $upeer_sockaddr
	addrlen_uaddr = $upeer_addrlen
	flags = __int32($flags)
}
probe __syscall.socketcall.accept4 = kernel.function("sys_socketcall").call ?
{
	if (__int32($call) != @const("SYS_ACCEPT4")) next;
	sockfd = __int32(user_ulong(&@ulong_cast($args)[0]))
	addr_uaddr = user_ulong(&@ulong_cast($args)[1])
	addrlen_uaddr = user_ulong(&@ulong_cast($args)[2])
	flags = __int32(user_ulong(&@ulong_cast($args)[3]))
}
probe __syscall.compat_socketcall.accept4 =
	kernel.function("compat_sys_socketcall").call ?
{
	if (__int32($call) != @const("SYS_ACCEPT4")) next;
	sockfd = user_int(&@uint_cast($args)[0])
	addr_uaddr = user_uint32(&@uint_cast($args)[1])
	addrlen_uaddr = user_uint32(&@uint_cast($args)[2])
	flags = user_int(&@uint_cast($args)[3])
}
probe dw_syscall.accept4.return = __syscall.accept4.return ?,
	__syscall.socketcall.accept4.return ?
{
	@_SYSCALL_ACCEPT4_NAME
	@SYSC_RETVALSTR($return)
}
probe __syscall.accept4.return = kernel.function("sys_accept4").return ?
{
	@__syscall_nr_gate(@const("__NR_accept4"))
}
probe __syscall.socketcall.accept4.return =
	kernel.function("sys_socketcall").return ?,
	kernel.function("compat_sys_socketcall").return ?
{
	if (__int32(@entry($call)) != @const("SYS_ACCEPT4")) next;
}

# nd_accept4 _____________________________________________________

probe nd_syscall.accept4 = nd1_syscall.accept4!, nd2_syscall.accept4!, tp_syscall.accept4
  { }

probe nd1_syscall.accept4 = __nd1_syscall.accept4 ?,
	__nd1_syscall.socketcall.accept4 ?,
	__nd1_syscall.compat_socketcall.accept4 ?
{
	@_SYSCALL_ACCEPT4_NAME
	flags_str = _sock_flags_str(flags)
	@_SYSCALL_ACCEPT4_ARGSTR
}
probe __nd1_syscall.accept4 = kprobe.function("sys_accept4").call
{
	asmlinkage()
	// On all tested platforms, there wasn't a different syscall
	// number for the compat version of accept4().
	@__syscall_nr_gate(@const("__NR_accept4"))
	@_SYSCALL_ACCEPT4_REGARGS
}
probe __nd1_syscall.socketcall.accept4 = kprobe.function("sys_socketcall").call ?
{
	asmlinkage()
	if (int_arg(1) != @const("SYS_ACCEPT4")) next;
	@_SYSCALL_SOCKETCALL_ACCEPT4_REGARGS
}
probe __nd1_syscall.compat_socketcall.accept4 =
	kprobe.function("compat_sys_socketcall").call ?
{
	asmlinkage()
	if (int_arg(1) != @const("SYS_ACCEPT4")) next;
	@_SYSCALL_COMPAT_SOCKETCALL_ACCEPT4_REGARGS
}

/* kernel 4.17+ */
probe nd2_syscall.accept4 = __nd2_syscall.accept4 ?,
	__nd2_syscall.socketcall.accept4 ?,
	__nd2_syscall.compat_socketcall.accept4 ?
{
	@_SYSCALL_ACCEPT4_NAME
	flags_str = _sock_flags_str(flags)
	@_SYSCALL_ACCEPT4_ARGSTR
}
probe __nd2_syscall.accept4 = kprobe.function(@arch_syscall_prefix "sys_accept4").call
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_ACCEPT4_REGARGS
}
probe __nd2_syscall.socketcall.accept4 = kprobe.function(@arch_syscall_prefix "sys_socketcall").call ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	if (int_arg(1) != @const("SYS_ACCEPT4")) next;
	@_SYSCALL_SOCKETCALL_ACCEPT4_REGARGS
}
probe __nd2_syscall.compat_socketcall.accept4 =
	kprobe.function(@arch_syscall_prefix "compat_sys_socketcall").call ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	if (int_arg(1) != @const("SYS_ACCEPT4")) next;
	@_SYSCALL_COMPAT_SOCKETCALL_ACCEPT4_REGARGS
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.accept4 = __tp_syscall.accept4 ?,
	__tp_syscall.socketcall.accept4 ?
{
	@_SYSCALL_ACCEPT4_NAME
	flags_str = _sock_flags_str(flags)
	@_SYSCALL_ACCEPT4_ARGSTR
}
probe __tp_syscall.accept4 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_accept4"))
	@_SYSCALL_ACCEPT4_REGARGS
}
probe __tp_syscall.socketcall.accept4 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_socketcall"), @const("__NR_compat_socketcall"))
	if (int_arg(1) != @const("SYS_ACCEPT4")) next;
	if (@__compat_task) {
		@_SYSCALL_COMPAT_SOCKETCALL_ACCEPT4_REGARGS
	}
	else {
		@_SYSCALL_SOCKETCALL_ACCEPT4_REGARGS
	}
}

probe nd_syscall.accept.return = nd1_syscall.accept.return!, nd2_syscall.accept.return!, tp_syscall.accept.return
  { }

probe nd1_syscall.accept4.return = __nd1_syscall.accept4.return ?,
	__nd1_syscall.socketcall.accept4.return ?
{
	@_SYSCALL_ACCEPT4_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.accept4.return = kprobe.function("sys_accept4").return ?
{
	@__syscall_nr_gate(@const("__NR_accept4"))
}
probe __nd1_syscall.socketcall.accept4.return =
	kprobe.function("sys_socketcall").return ?,
	kprobe.function("compat_sys_socketcall").return ?
{
	if (@entry(__asmlinkage_int_arg(1)) != @const("SYS_ACCEPT4")) next;
}

/* kernel 4.17+ */
probe nd2_syscall.accept4.return =
	kprobe.function(@arch_syscall_prefix "sys_accept4").return ?,
	__nd2_syscall.socketcall.accept4.return ?
{
	@_SYSCALL_ACCEPT4_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd2_syscall.socketcall.accept4.return =
	kprobe.function(@arch_syscall_prefix "sys_socketcall").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_socketcall").return ?
{
	__set_syscall_pt_regs(@entry(pointer_arg(1)))
	if (int_arg(1) != @const("SYS_ACCEPT4")) next;
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.accept4.return = __tp_syscall.accept4.return ?,
	__tp_syscall.socketcall.accept4.return ?
{
	@_SYSCALL_ACCEPT4_NAME
	@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.accept4.return = kernel.trace("sys_exit")
{
	@__syscall_nr_gate(@const("__NR_accept4"))
}
probe __tp_syscall.accept4.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_socketcall"), @const("__NR_compat_socketcall"))
	if (int_arg(1) != @const("SYS_ACCEPT4")) next;
}