if_vlan_var.h

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    1 /*-
    2  * Copyright 1998 Massachusetts Institute of Technology
    3  *
    4  * Permission to use, copy, modify, and distribute this software and
    5  * its documentation for any purpose and without fee is hereby
    6  * granted, provided that both the above copyright notice and this
    7  * permission notice appear in all copies, that both the above
    8  * copyright notice and this permission notice appear in all
    9  * supporting documentation, and that the name of M.I.T. not be used
   10  * in advertising or publicity pertaining to distribution of the
   11  * software without specific, written prior permission.  M.I.T. makes
   12  * no representations about the suitability of this software for any
   13  * purpose.  It is provided "as is" without express or implied
   14  * warranty.
   15  * 
   16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/12.0/sys/net/if_vlan_var.h 337932 2018-08-16 23:46:38Z np $
   30  */
   31 
   32 #ifndef _NET_IF_VLAN_VAR_H_
   33 #define _NET_IF_VLAN_VAR_H_     1
   34 
   35 /* Set the VLAN ID in an mbuf packet header non-destructively. */
   36 #define EVL_APPLY_VLID(m, vlid)                                         \
   37         do {                                                            \
   38                 if ((m)->m_flags & M_VLANTAG) {                         \
   39                         (m)->m_pkthdr.ether_vtag &= EVL_VLID_MASK;      \
   40                         (m)->m_pkthdr.ether_vtag |= (vlid);             \
   41                 } else {                                                \
   42                         (m)->m_pkthdr.ether_vtag = (vlid);              \
   43                         (m)->m_flags |= M_VLANTAG;                      \
   44                 }                                                       \
   45         } while (0)
   46 
   47 /* Set the priority ID in an mbuf packet header non-destructively. */
   48 #define EVL_APPLY_PRI(m, pri)                                           \
   49         do {                                                            \
   50                 if ((m)->m_flags & M_VLANTAG) {                         \
   51                         uint16_t __vlantag = (m)->m_pkthdr.ether_vtag;  \
   52                         (m)->m_pkthdr.ether_vtag |= EVL_MAKETAG(        \
   53                             EVL_VLANOFTAG(__vlantag), (pri),            \
   54                             EVL_CFIOFTAG(__vlantag));                   \
   55                 } else {                                                \
   56                         (m)->m_pkthdr.ether_vtag =                      \
   57                             EVL_MAKETAG(0, (pri), 0);                   \
   58                         (m)->m_flags |= M_VLANTAG;                      \
   59                 }                                                       \
   60         } while (0)
   61 
   62 /* sysctl(3) tags, for compatibility purposes */
   63 #define VLANCTL_PROTO   1
   64 #define VLANCTL_MAX     2
   65 
   66 /*
   67  * Configuration structure for SIOCSETVLAN and SIOCGETVLAN ioctls.
   68  */
   69 struct  vlanreq {
   70         char    vlr_parent[IFNAMSIZ];
   71         u_short vlr_tag;
   72 };
   73 #define SIOCSETVLAN     SIOCSIFGENERIC
   74 #define SIOCGETVLAN     SIOCGIFGENERIC
   75 
   76 #define SIOCGVLANPCP    SIOCGLANPCP     /* Get VLAN PCP */
   77 #define SIOCSVLANPCP    SIOCSLANPCP     /* Set VLAN PCP */
   78 
   79 #ifdef _KERNEL
   80 /*
   81  * Drivers that are capable of adding and removing the VLAN header
   82  * in hardware indicate they support this by marking IFCAP_VLAN_HWTAGGING
   83  * in if_capabilities.  Drivers for hardware that is capable
   84  * of handling larger MTU's that may include a software-appended
   85  * VLAN header w/o lowering the normal MTU should mark IFCAP_VLAN_MTU
   86  * in if_capabilities; this notifies the VLAN code it can leave the
   87  * MTU on the vlan interface at the normal setting.
   88  */
   89 
   90 /*
   91  * VLAN tags are stored in host byte order.  Byte swapping may be
   92  * necessary.
   93  *
   94  * Drivers that support hardware VLAN tag stripping fill in the
   95  * received VLAN tag (containing both vlan and priority information)
   96  * into the ether_vtag mbuf packet header field:
   97  * 
   98  *      m->m_pkthdr.ether_vtag = vtag;          // ntohs()?
   99  *      m->m_flags |= M_VLANTAG;
  100  *
  101  * to mark the packet m with the specified VLAN tag.
  102  *
  103  * On output the driver should check the mbuf for the M_VLANTAG
  104  * flag to see if a VLAN tag is present and valid:
  105  *
  106  *      if (m->m_flags & M_VLANTAG) {
  107  *              ... = m->m_pkthdr.ether_vtag;   // htons()?
  108  *              ... pass tag to hardware ...
  109  *      }
  110  *
  111  * Note that a driver must indicate it supports hardware VLAN
  112  * stripping/insertion by marking IFCAP_VLAN_HWTAGGING in
  113  * if_capabilities.
  114  */
  115 
  116 /*
  117  * The 802.1q code may also tag mbufs with the PCP (priority) field for use in
  118  * other layers of the stack, in which case an m_tag will be used.  This is
  119  * semantically quite different from use of the ether_vtag field, which is
  120  * defined only between the device driver and VLAN layer.
  121  */
  122 #define MTAG_8021Q              1326104895
  123 #define MTAG_8021Q_PCP_IN       0               /* Input priority. */
  124 #define MTAG_8021Q_PCP_OUT      1               /* Output priority. */
  125 
  126 #define VLAN_CAPABILITIES(_ifp) do {                            \
  127         if ((_ifp)->if_vlantrunk != NULL)                       \
  128                 (*vlan_trunk_cap_p)(_ifp);                      \
  129 } while (0)
  130 
  131 #define VLAN_TRUNKDEV(_ifp)                                     \
  132         ((_ifp)->if_type == IFT_L2VLAN ? (*vlan_trunkdev_p)((_ifp)) : NULL)
  133 #define VLAN_TAG(_ifp, _vid)                                    \
  134         ((_ifp)->if_type == IFT_L2VLAN ? (*vlan_tag_p)((_ifp), (_vid)) : EINVAL)
  135 #define VLAN_PCP(_ifp, _pcp)                                    \
  136         ((_ifp)->if_type == IFT_L2VLAN ? (*vlan_pcp_p)((_ifp), (_pcp)) : EINVAL)
  137 #define VLAN_COOKIE(_ifp)                                       \
  138         ((_ifp)->if_type == IFT_L2VLAN ? (*vlan_cookie_p)((_ifp)) : NULL)
  139 #define VLAN_SETCOOKIE(_ifp, _cookie)                           \
  140         ((_ifp)->if_type == IFT_L2VLAN ?                        \
  141             (*vlan_setcookie_p)((_ifp), (_cookie)) : EINVAL)
  142 #define VLAN_DEVAT(_ifp, _vid)                                  \
  143         ((_ifp)->if_vlantrunk != NULL ? (*vlan_devat_p)((_ifp), (_vid)) : NULL)
  144 
  145 extern  void (*vlan_trunk_cap_p)(struct ifnet *);
  146 extern  struct ifnet *(*vlan_trunkdev_p)(struct ifnet *);
  147 extern  struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t);
  148 extern  int (*vlan_tag_p)(struct ifnet *, uint16_t *);
  149 extern  int (*vlan_pcp_p)(struct ifnet *, uint16_t *);
  150 extern  int (*vlan_setcookie_p)(struct ifnet *, void *);
  151 extern  void *(*vlan_cookie_p)(struct ifnet *);
  152 
  153 #ifdef _SYS_EVENTHANDLER_H_
  154 /* VLAN state change events */
  155 typedef void (*vlan_config_fn)(void *, struct ifnet *, uint16_t);
  156 typedef void (*vlan_unconfig_fn)(void *, struct ifnet *, uint16_t);
  157 EVENTHANDLER_DECLARE(vlan_config, vlan_config_fn);
  158 EVENTHANDLER_DECLARE(vlan_unconfig, vlan_unconfig_fn);
  159 #endif /* _SYS_EVENTHANDLER_H_ */
  160 
  161 #endif /* _KERNEL */
  162 
  163 #endif /* _NET_IF_VLAN_VAR_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/net/if_vlan_var.h

FreeBSD/Linux Kernel Cross Reference
sys/net/if_vlan_var.h