9832 Original bug discovered as 9560 has friends IPv4 packets coming in as IPv6 creating chaos
Reviewed by: Robert Mustacchi <rm@joyent.com>

*** 18,28 ****
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2017, Joyent, Inc.
   */
  
  #ifndef _SYS_MAC_IMPL_H
  #define _SYS_MAC_IMPL_H
  
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2019, Joyent, Inc.
   */
  
  #ifndef _SYS_MAC_IMPL_H
  #define _SYS_MAC_IMPL_H
  
*** 721,731 ****
  
  extern void     mac_init(void);
  extern int      mac_fini(void);
  
  extern void     mac_ndd_ioctl(mac_impl_t *, queue_t *, mblk_t *);
! extern boolean_t mac_ip_hdr_length_v6(ip6_t *, uint8_t *, uint16_t *,
      uint8_t *, ip6_frag_t **);
  
  extern mblk_t *mac_copymsgchain_cksum(mblk_t *);
  extern mblk_t *mac_fix_cksum(mblk_t *);
  extern void mac_packet_print(mac_handle_t, mblk_t *);
--- 721,731 ----
  
  extern void     mac_init(void);
  extern int      mac_fini(void);
  
  extern void     mac_ndd_ioctl(mac_impl_t *, queue_t *, mblk_t *);
! extern int mac_ip_hdr_length_v6(ip6_t *, uint8_t *, uint16_t *,
      uint8_t *, ip6_frag_t **);
  
  extern mblk_t *mac_copymsgchain_cksum(mblk_t *);
  extern mblk_t *mac_fix_cksum(mblk_t *);
  extern void mac_packet_print(mac_handle_t, mblk_t *);