The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/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/6.3/sys/net/if_vlan_var.h 173886 2007-11-24 19:45:58Z cvs2svn $
   30  */
   31 
   32 #ifndef _NET_IF_VLAN_VAR_H_
   33 #define _NET_IF_VLAN_VAR_H_     1
   34 
   35 struct  ether_vlan_header {
   36         u_char  evl_dhost[ETHER_ADDR_LEN];
   37         u_char  evl_shost[ETHER_ADDR_LEN];
   38         u_int16_t evl_encap_proto;
   39         u_int16_t evl_tag;
   40         u_int16_t evl_proto;
   41 };
   42 
   43 #define EVL_VLID_MASK   0x0FFF
   44 #define EVL_VLANOFTAG(tag) ((tag) & EVL_VLID_MASK)
   45 #define EVL_PRIOFTAG(tag) (((tag) >> 13) & 7)
   46 
   47 /* sysctl(3) tags, for compatibility purposes */
   48 #define VLANCTL_PROTO   1
   49 #define VLANCTL_MAX     2
   50 
   51 /*
   52  * Configuration structure for SIOCSETVLAN and SIOCGETVLAN ioctls.
   53  */
   54 struct  vlanreq {
   55         char    vlr_parent[IFNAMSIZ];
   56         u_short vlr_tag;
   57 };
   58 #define SIOCSETVLAN     SIOCSIFGENERIC
   59 #define SIOCGETVLAN     SIOCGIFGENERIC
   60 
   61 #ifdef _KERNEL
   62 /*
   63  * Drivers that are capable of adding and removing the VLAN header
   64  * in hardware indicate they support this by marking IFCAP_VLAN_HWTAGGING
   65  * in if_capabilities.  Drivers for hardware that is capable
   66  * of handling larger MTU's that may include a software-appended
   67  * VLAN header w/o lowering the normal MTU should mark IFCAP_VLAN_MTU
   68  * in if_capabilities; this notifies the VLAN code it can leave the
   69  * MTU on the vlan interface at the normal setting.
   70  */
   71 
   72 /*
   73  * Drivers that support hardware VLAN tagging pass a packet's tag
   74  * up through the stack by appending a packet tag with this value.
   75  * Output is handled likewise, the driver must locate the packet
   76  * tag to extract the VLAN tag.  The following macros are used to
   77  * do this work.  On input, do:
   78  *
   79  *      VLAN_INPUT_TAG(ifp, m, tag,);
   80  *
   81  * to mark the packet m with the specified VLAN tag.  The last
   82  * parameter provides code to execute in case of an error.  On
   83  * output the driver should check mbuf to see if a VLAN tag is
   84  * present and only then check for a tag; this is done with:
   85  *
   86  *      struct m_tag *mtag;
   87  *      mtag = VLAN_OUTPUT_TAG(ifp, m);
   88  *      if (mtag != NULL) {
   89  *              ... = VLAN_TAG_VALUE(mtag);
   90  *              ... pass tag to hardware ...
   91  *      }
   92  *
   93  * Note that a driver must indicate it supports hardware VLAN
   94  * tagging by marking IFCAP_VLAN_HWTAGGING in if_capabilities.
   95  */
   96 #define MTAG_VLAN       1035328035
   97 #define MTAG_VLAN_TAG   0               /* tag of VLAN interface */
   98 
   99 /*
  100  * This macro must expand to a lvalue so that it can be used
  101  * to set a tag with a simple assignment.
  102  */
  103 #define VLAN_TAG_VALUE(_mt)     (*(u_int *)((_mt) + 1))
  104 
  105 /*
  106  * This macro is kept for API compatibility. 
  107  */
  108 #define VLAN_INPUT_TAG(_ifp, _m, _t, _errcase) do {     \
  109         struct m_tag *mtag;                             \
  110         mtag = m_tag_alloc(MTAG_VLAN, MTAG_VLAN_TAG,    \
  111             sizeof (u_int), M_NOWAIT);                  \
  112         if (mtag != NULL) {                             \
  113                 VLAN_TAG_VALUE(mtag) = (_t);            \
  114                 m_tag_prepend((_m), mtag);              \
  115                 (_m)->m_flags |= M_VLANTAG;             \
  116         } else {                                        \
  117                 (_ifp)->if_ierrors++;                   \
  118                 m_freem(_m);                            \
  119                 _errcase;                               \
  120         }                                               \
  121 } while (0)
  122 
  123 /*
  124  * This macro is equal to VLAN_INPUT_TAG() in HEAD.
  125  */
  126 #define VLAN_INPUT_TAG_NEW(_ifp, _m, _t) do {                   \
  127         struct m_tag *mtag;                                     \
  128         mtag = m_tag_alloc(MTAG_VLAN, MTAG_VLAN_TAG,            \
  129                            sizeof (u_int), M_NOWAIT);           \
  130         if (mtag != NULL) {                                     \
  131                 VLAN_TAG_VALUE(mtag) = (_t);                    \
  132                 m_tag_prepend((_m), mtag);                      \
  133                 (_m)->m_flags |= M_VLANTAG;                     \
  134         } else {                                                \
  135                 (_ifp)->if_ierrors++;                           \
  136                 m_freem(_m);                                    \
  137                 _m = NULL;                                      \
  138         }                                                       \
  139 } while (0)
  140 
  141 #define VLAN_OUTPUT_TAG(_ifp, _m)                               \
  142         ((_m)->m_flags & M_VLANTAG ?                            \
  143                 m_tag_locate((_m), MTAG_VLAN, MTAG_VLAN_TAG, NULL) : NULL)
  144 #endif /* _KERNEL */
  145 
  146 #endif /* _NET_IF_VLAN_VAR_H_ */

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