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  * $FreeBSD$
   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_PRI_MASK            0xE000
   45 #define EVL_VLANOFTAG(tag)      ((tag) & EVL_VLID_MASK)
   46 #define EVL_PRIOFTAG(tag)       (((tag) >> 13) & 7)
   47 #define EVL_CFIOFTAG(tag)       (((tag) >> 12) & 1)
   48 #define EVL_MAKETAG(vlid, pri, cfi)                                     \
   49         ((((((pri) & 7) << 1) | ((cfi) & 1)) << 12) | ((vlid) & EVL_VLID_MASK))
   50 
   51 /* Set the VLAN ID in an mbuf packet header non-destructively. */
   52 #define EVL_APPLY_VLID(m, vlid)                                         \
   53         do {                                                            \
   54                 if ((m)->m_flags & M_VLANTAG) {                         \
   55                         (m)->m_pkthdr.ether_vtag &= EVL_VLID_MASK;      \
   56                         (m)->m_pkthdr.ether_vtag |= (vlid);             \
   57                 } else {                                                \
   58                         (m)->m_pkthdr.ether_vtag = (vlid);              \
   59                         (m)->m_flags |= M_VLANTAG;                      \
   60                 }                                                       \
   61         } while (0)
   62 
   63 /* Set the priority ID in an mbuf packet header non-destructively. */
   64 #define EVL_APPLY_PRI(m, pri)                                           \
   65         do {                                                            \
   66                 if ((m)->m_flags & M_VLANTAG) {                         \
   67                         uint16_t __vlantag = (m)->m_pkthdr.ether_vtag;  \
   68                         (m)->m_pkthdr.ether_vtag |= EVL_MAKETAG(        \
   69                             EVL_VLANOFTAG(__vlantag), (pri),            \
   70                             EVL_CFIOFTAG(__vlantag));                   \
   71                 } else {                                                \
   72                         (m)->m_pkthdr.ether_vtag =                      \
   73                             EVL_MAKETAG(0, (pri), 0);                   \
   74                         (m)->m_flags |= M_VLANTAG;                      \
   75                 }                                                       \
   76         } while (0)
   77 
   78 /* sysctl(3) tags, for compatibility purposes */
   79 #define VLANCTL_PROTO   1
   80 #define VLANCTL_MAX     2
   81 
   82 /*
   83  * Configuration structure for SIOCSETVLAN and SIOCGETVLAN ioctls.
   84  */
   85 struct  vlanreq {
   86         char    vlr_parent[IFNAMSIZ];
   87         u_short vlr_tag;
   88 };
   89 #define SIOCSETVLAN     SIOCSIFGENERIC
   90 #define SIOCGETVLAN     SIOCGIFGENERIC
   91 
   92 #ifdef _KERNEL
   93 /*
   94  * Drivers that are capable of adding and removing the VLAN header
   95  * in hardware indicate they support this by marking IFCAP_VLAN_HWTAGGING
   96  * in if_capabilities.  Drivers for hardware that is capable
   97  * of handling larger MTU's that may include a software-appended
   98  * VLAN header w/o lowering the normal MTU should mark IFCAP_VLAN_MTU
   99  * in if_capabilities; this notifies the VLAN code it can leave the
  100  * MTU on the vlan interface at the normal setting.
  101  */
  102 
  103 /*
  104  * VLAN tags are stored in host byte order.  Byte swapping may be
  105  * necessary.
  106  *
  107  * Drivers that support hardware VLAN tag stripping fill in the
  108  * received VLAN tag (containing both vlan and priority information)
  109  * into the ether_vtag mbuf packet header field:
  110  * 
  111  *      m->m_pkthdr.ether_vtag = vlan_id;       // ntohs()?
  112  *      m->m_flags |= M_VLANTAG;
  113  *
  114  * to mark the packet m with the specified VLAN tag.
  115  *
  116  * On output the driver should check the mbuf for the M_VLANTAG
  117  * flag to see if a VLAN tag is present and valid:
  118  *
  119  *      if (m->m_flags & M_VLANTAG) {
  120  *              ... = m->m_pkthdr.ether_vtag;   // htons()?
  121  *              ... pass tag to hardware ...
  122  *      }
  123  *
  124  * Note that a driver must indicate it supports hardware VLAN
  125  * stripping/insertion by marking IFCAP_VLAN_HWTAGGING in
  126  * if_capabilities.
  127  */
  128 
  129 #define VLAN_CAPABILITIES(_ifp) do {                            \
  130         if ((_ifp)->if_vlantrunk != NULL)                       \
  131                 (*vlan_trunk_cap_p)(_ifp);                      \
  132 } while (0)
  133 
  134 extern  void (*vlan_trunk_cap_p)(struct ifnet *);
  135 #endif /* _KERNEL */
  136 
  137 #endif /* _NET_IF_VLAN_VAR_H_ */

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