87         (iptun_type == IPTUN_TYPE_6TO4 && family == AF_INET))
  88 
  89 #define IPTUN_HASH_KEY(key)     ((mod_hash_key_t)(uintptr_t)(key))
  90 
  91 #define IPTUN_MIN_IPV4_MTU      576             /* ip.h still uses 68 (!) */
  92 #define IPTUN_MIN_IPV6_MTU      IPV6_MIN_MTU
  93 #define IPTUN_MAX_IPV4_MTU      (IP_MAXPACKET - sizeof (ipha_t))
  94 #define IPTUN_MAX_IPV6_MTU      (IP_MAXPACKET - sizeof (ip6_t) -        \
  95                                     sizeof (iptun_encaplim_t))
  96 
  97 #define IPTUN_MIN_HOPLIMIT      1
  98 #define IPTUN_MAX_HOPLIMIT      UINT8_MAX
  99 
 100 #define IPTUN_MIN_ENCAPLIMIT    0
 101 #define IPTUN_MAX_ENCAPLIMIT    UINT8_MAX
 102 
 103 #define IPTUN_IPSEC_REQ_MASK    (IPSEC_PREF_REQUIRED | IPSEC_PREF_NEVER)
 104 
 105 static iptun_encaplim_t iptun_encaplim_init = {
 106         { IPPROTO_NONE, 0 },
 107         IP6OPT_TUNNEL_LIMIT,
 108         1,
 109         IPTUN_DEFAULT_ENCAPLIMIT,       /* filled in with actual value later */
 110         IP6OPT_PADN,
 111         1,
 112         0
 113 };
 114 
 115 /*
 116  * Table containing per-iptun-type information.
 117  * Since IPv6 can run over all of these we have the IPv6 min as the min MTU.
 118  */
 119 static iptun_typeinfo_t iptun_type_table[] = {
 120         { IPTUN_TYPE_IPV4, MAC_PLUGIN_IDENT_IPV4, IPV4_VERSION,
 121             IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV4_MTU,     B_TRUE },
 122         { IPTUN_TYPE_IPV6, MAC_PLUGIN_IDENT_IPV6, IPV6_VERSION,
 123             IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV6_MTU,     B_TRUE },
 124         { IPTUN_TYPE_6TO4, MAC_PLUGIN_IDENT_6TO4, IPV4_VERSION,
 125             IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV4_MTU,     B_FALSE },
 126         { IPTUN_TYPE_UNKNOWN, NULL, 0, 0, 0, B_FALSE }
 127 };
 128 
 129 /*
 130  * iptun_hash is an iptun_t lookup table by link ID protected by
 131  * iptun_hash_lock.  While the hash table's integrity is maintained via
 132  * internal locking in the mod_hash_*() functions, we need additional locking

  87         (iptun_type == IPTUN_TYPE_6TO4 && family == AF_INET))
  88 
  89 #define IPTUN_HASH_KEY(key)     ((mod_hash_key_t)(uintptr_t)(key))
  90 
  91 #define IPTUN_MIN_IPV4_MTU      576             /* ip.h still uses 68 (!) */
  92 #define IPTUN_MIN_IPV6_MTU      IPV6_MIN_MTU
  93 #define IPTUN_MAX_IPV4_MTU      (IP_MAXPACKET - sizeof (ipha_t))
  94 #define IPTUN_MAX_IPV6_MTU      (IP_MAXPACKET - sizeof (ip6_t) -        \
  95                                     sizeof (iptun_encaplim_t))
  96 
  97 #define IPTUN_MIN_HOPLIMIT      1
  98 #define IPTUN_MAX_HOPLIMIT      UINT8_MAX
  99 
 100 #define IPTUN_MIN_ENCAPLIMIT    0
 101 #define IPTUN_MAX_ENCAPLIMIT    UINT8_MAX
 102 
 103 #define IPTUN_IPSEC_REQ_MASK    (IPSEC_PREF_REQUIRED | IPSEC_PREF_NEVER)
 104 
 105 static iptun_encaplim_t iptun_encaplim_init = {
 106         { IPPROTO_NONE, 0 },
 107         {   IP6OPT_TUNNEL_LIMIT,
 108             1,
 109             IPTUN_DEFAULT_ENCAPLIMIT }, /* filled in with actual value later */
 110         {   IP6OPT_PADN,
 111             1,
 112             0 }
 113 };
 114 
 115 /*
 116  * Table containing per-iptun-type information.
 117  * Since IPv6 can run over all of these we have the IPv6 min as the min MTU.
 118  */
 119 static iptun_typeinfo_t iptun_type_table[] = {
 120         { IPTUN_TYPE_IPV4, MAC_PLUGIN_IDENT_IPV4, IPV4_VERSION,
 121             IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV4_MTU,     B_TRUE },
 122         { IPTUN_TYPE_IPV6, MAC_PLUGIN_IDENT_IPV6, IPV6_VERSION,
 123             IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV6_MTU,     B_TRUE },
 124         { IPTUN_TYPE_6TO4, MAC_PLUGIN_IDENT_6TO4, IPV4_VERSION,
 125             IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV4_MTU,     B_FALSE },
 126         { IPTUN_TYPE_UNKNOWN, NULL, 0, 0, 0, B_FALSE }
 127 };
 128 
 129 /*
 130  * iptun_hash is an iptun_t lookup table by link ID protected by
 131  * iptun_hash_lock.  While the hash table's integrity is maintained via
 132  * internal locking in the mod_hash_*() functions, we need additional locking