snmpd(8) and 'pfctl -s Interfaces' dump pf's internal list of interfaces. pf.conf's 'set skip on ifN' and 'pfctl -F all|Reset' set and clear flags, PFI_IFLAG_SKIP being the only flag.
(There's no other usage of these ioctls in base.) pf's internal interface list is completely protected by the pf lock, pf lock assertions since pf_if.c r1.110 from over a week ago support this. OK? Index: pf_ioctl.c =================================================================== RCS file: /cvs/src/sys/net/pf_ioctl.c,v retrieving revision 1.405 diff -u -p -r1.405 pf_ioctl.c --- pf_ioctl.c 26 May 2023 12:13:26 -0000 1.405 +++ pf_ioctl.c 26 May 2023 12:46:37 -0000 @@ -2942,11 +2942,9 @@ pfioctl(dev_t dev, u_long cmd, caddr_t a goto fail; } - NET_LOCK(); PF_LOCK(); pfi_get_ifaces(io->pfiio_name, kif_buf, &io->pfiio_size); PF_UNLOCK(); - NET_UNLOCK(); if (copyout(kif_buf, io->pfiio_buffer, sizeof(*kif_buf) * io->pfiio_size)) error = EFAULT; @@ -2962,11 +2960,9 @@ pfioctl(dev_t dev, u_long cmd, caddr_t a goto fail; } - NET_LOCK(); PF_LOCK(); error = pfi_set_flags(io->pfiio_name, io->pfiio_flags); PF_UNLOCK(); - NET_UNLOCK(); break; } @@ -2978,11 +2974,9 @@ pfioctl(dev_t dev, u_long cmd, caddr_t a goto fail; } - NET_LOCK(); PF_LOCK(); error = pfi_clear_flags(io->pfiio_name, io->pfiio_flags); PF_UNLOCK(); - NET_UNLOCK(); break; }