Function bpfioctl

freebsd/net/bpf.c:1353–1904

* FIONREAD Check for read packet available. * BIOCGBLEN Get buffer len [for read()]. * BIOCSETF Set read filter. * BIOCSETFNR Set read filter without resetting descriptor. * BIOCSETWF Set write filter. * BIOCFLUSH Flush read packet buffer. * BIOCPROMISC Put interface into promiscuous mode. * BIOCGDLT Get link layer type. * BIOCGETIF Get interface name. * BIOCSETIF Set

 */
/* ARGSUSED */
static	int
bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
    struct thread *td)
{
	struct bpf_d *d;
	int error;

	error = devfs_get_cdevpriv((void **)&d);
	if (error != 0)
		return (error);

	/*
	 * Refresh PID associated with this descriptor.
	 */
	BPFD_LOCK(d);
	BPF_PID_REFRESH(d, td);
	if (d->bd_state == BPF_WAITING)
		callout_stop(&d->bd_callout);
	d->bd_state = BPF_IDLE;
	BPFD_UNLOCK(d);

	if (d->bd_locked == 1) {
		switch (cmd) {
		case BIOCGBLEN:
		case BIOCFLUSH:
		case BIOCGDLT:
		case BIOCGDLTLIST:
#ifdef COMPAT_FREEBSD32
		case BIOCGDLTLIST32:
#endif
		case BIOCGETIF:
		case BIOCGRTIMEOUT:
#if defined(COMPAT_FREEBSD32) && defined(__amd64__)
		case BIOCGRTIMEOUT32:
#endif
		case BIOCGSTATS:
		case BIOCVERSION:
		case BIOCGRSIG:
		case BIOCGHDRCMPLT:
		case BIOCSTSTAMP:
		case BIOCFEEDBACK:
		case FIONREAD:
		case BIOCLOCK:
		case BIOCSRTIMEOUT:
#if defined(COMPAT_FREEBSD32) && defined(__amd64__)
		case BIOCSRTIMEOUT32:
#endif
		case BIOCIMMEDIATE:
		case TIOCGPGRP:
		case BIOCROTZBUF:
			break;
		default:
			return (EPERM);
		}
	}
#ifdef COMPAT_FREEBSD32
	/*
	 * If we see a 32-bit compat ioctl, mark the stream as 32-bit so