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 #include <sys/mbuf.h>
   36 
   37 /* Set the VLAN ID in an mbuf packet header non-destructively. */
   38 #define EVL_APPLY_VLID(m, vlid)                                         \
   39         do {                                                            \
   40                 if ((m)->m_flags & M_VLANTAG) {                         \
   41                         (m)->m_pkthdr.ether_vtag &= EVL_VLID_MASK;      \
   42                         (m)->m_pkthdr.ether_vtag |= (vlid);             \
   43                 } else {                                                \
   44                         (m)->m_pkthdr.ether_vtag = (vlid);              \
   45                         (m)->m_flags |= M_VLANTAG;                      \
   46                 }                                                       \
   47         } while (0)
   48 
   49 /* Set the priority ID in an mbuf packet header non-destructively. */
   50 #define EVL_APPLY_PRI(m, pri)                                           \
   51         do {                                                            \
   52                 if ((m)->m_flags & M_VLANTAG) {                         \
   53                         uint16_t __vlantag = (m)->m_pkthdr.ether_vtag;  \
   54                         (m)->m_pkthdr.ether_vtag |= EVL_MAKETAG(        \
   55                             EVL_VLANOFTAG(__vlantag), (pri),            \
   56                             EVL_CFIOFTAG(__vlantag));                   \
   57                 } else {                                                \
   58                         (m)->m_pkthdr.ether_vtag =                      \
   59                             EVL_MAKETAG(0, (pri), 0);                   \
   60                         (m)->m_flags |= M_VLANTAG;                      \
   61                 }                                                       \
   62         } while (0)
   63 
   64 /* sysctl(3) tags, for compatibility purposes */
   65 #define VLANCTL_PROTO   1
   66 #define VLANCTL_MAX     2
   67 
   68 /*
   69  * Configuration structure for SIOCSETVLAN and SIOCGETVLAN ioctls.
   70  */
   71 struct  vlanreq {
   72         char    vlr_parent[IFNAMSIZ];
   73         u_short vlr_tag;
   74         u_short vlr_proto;
   75 };
   76 #define SIOCSETVLAN     SIOCSIFGENERIC
   77 #define SIOCGETVLAN     SIOCGIFGENERIC
   78 
   79 #define SIOCGVLANPCP    SIOCGLANPCP     /* Get VLAN PCP */
   80 #define SIOCSVLANPCP    SIOCSLANPCP     /* Set VLAN PCP */
   81 
   82 #ifdef _KERNEL
   83 /*
   84  * Drivers that are capable of adding and removing the VLAN header
   85  * in hardware indicate they support this by marking IFCAP_VLAN_HWTAGGING
   86  * in if_capabilities.  Drivers for hardware that is capable
   87  * of handling larger MTU's that may include a software-appended
   88  * VLAN header w/o lowering the normal MTU should mark IFCAP_VLAN_MTU
   89  * in if_capabilities; this notifies the VLAN code it can leave the
   90  * MTU on the vlan interface at the normal setting.
   91  */
   92 
   93 /*
   94  * VLAN tags are stored in host byte order.  Byte swapping may be
   95  * necessary.
   96  *
   97  * Drivers that support hardware VLAN tag stripping fill in the
   98  * received VLAN tag (containing both vlan and priority information)
   99  * into the ether_vtag mbuf packet header field:
  100  * 
  101  *      m->m_pkthdr.ether_vtag = vtag;          // ntohs()?
  102  *      m->m_flags |= M_VLANTAG;
  103  *
  104  * to mark the packet m with the specified VLAN tag.
  105  *
  106  * On output the driver should check the mbuf for the M_VLANTAG
  107  * flag to see if a VLAN tag is present and valid:
  108  *
  109  *      if (m->m_flags & M_VLANTAG) {
  110  *              ... = m->m_pkthdr.ether_vtag;   // htons()?
  111  *              ... pass tag to hardware ...
  112  *      }
  113  *
  114  * Note that a driver must indicate it supports hardware VLAN
  115  * stripping/insertion by marking IFCAP_VLAN_HWTAGGING in
  116  * if_capabilities.
  117  */
  118 
  119 /*
  120  * The 802.1q code may also tag mbufs with the PCP (priority) field for use in
  121  * other layers of the stack, in which case an m_tag will be used.  This is
  122  * semantically quite different from use of the ether_vtag field, which is
  123  * defined only between the device driver and VLAN layer.
  124  */
  125 #define MTAG_8021Q              1326104895
  126 #define MTAG_8021Q_PCP_IN       0               /* Input priority. */
  127 #define MTAG_8021Q_PCP_OUT      1               /* Output priority. */
  128 
  129 #define VLAN_PCP_MAX            7
  130 
  131 /*
  132  * 802.1q full tag. Proto and vid are stored in host byte order.
  133  */
  134 struct ether_8021q_tag {
  135         uint16_t proto;
  136         uint16_t vid;
  137         uint8_t  pcp;
  138 };
  139 
  140 #define VLAN_CAPABILITIES(_ifp) do {                            \
  141         if ((_ifp)->if_vlantrunk != NULL)                       \
  142                 (*vlan_trunk_cap_p)(_ifp);                      \
  143 } while (0)
  144 
  145 #define VLAN_TRUNKDEV(_ifp)                                     \
  146         ((_ifp)->if_type == IFT_L2VLAN ? (*vlan_trunkdev_p)((_ifp)) : NULL)
  147 #define VLAN_TAG(_ifp, _vid)                                    \
  148         ((_ifp)->if_type == IFT_L2VLAN ? (*vlan_tag_p)((_ifp), (_vid)) : EINVAL)
  149 #define VLAN_PCP(_ifp, _pcp)                                    \
  150         ((_ifp)->if_type == IFT_L2VLAN ? (*vlan_pcp_p)((_ifp), (_pcp)) : EINVAL)
  151 #define VLAN_COOKIE(_ifp)                                       \
  152         ((_ifp)->if_type == IFT_L2VLAN ? (*vlan_cookie_p)((_ifp)) : NULL)
  153 #define VLAN_SETCOOKIE(_ifp, _cookie)                           \
  154         ((_ifp)->if_type == IFT_L2VLAN ?                        \
  155             (*vlan_setcookie_p)((_ifp), (_cookie)) : EINVAL)
  156 #define VLAN_DEVAT(_ifp, _vid)                                  \
  157         ((_ifp)->if_vlantrunk != NULL ? (*vlan_devat_p)((_ifp), (_vid)) : NULL)
  158 
  159 extern  void (*vlan_trunk_cap_p)(struct ifnet *);
  160 extern  struct ifnet *(*vlan_trunkdev_p)(struct ifnet *);
  161 extern  struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t);
  162 extern  int (*vlan_tag_p)(struct ifnet *, uint16_t *);
  163 extern  int (*vlan_pcp_p)(struct ifnet *, uint16_t *);
  164 extern  int (*vlan_setcookie_p)(struct ifnet *, void *);
  165 extern  void *(*vlan_cookie_p)(struct ifnet *);
  166 
  167 #include <sys/_eventhandler.h>
  168 
  169 /* VLAN state change events */
  170 typedef void (*vlan_config_fn)(void *, struct ifnet *, uint16_t);
  171 typedef void (*vlan_unconfig_fn)(void *, struct ifnet *, uint16_t);
  172 EVENTHANDLER_DECLARE(vlan_config, vlan_config_fn);
  173 EVENTHANDLER_DECLARE(vlan_unconfig, vlan_unconfig_fn);
  174 
  175 static inline int
  176 vlan_set_pcp(struct mbuf *m, uint8_t prio)
  177 {
  178         struct m_tag *mtag;
  179 
  180         KASSERT(prio <= VLAN_PCP_MAX,
  181             ("%s with invalid pcp", __func__));
  182 
  183         mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_OUT, NULL);
  184         if (mtag == NULL) {
  185                 mtag = m_tag_alloc(MTAG_8021Q, MTAG_8021Q_PCP_OUT,
  186                     sizeof(uint8_t), M_NOWAIT);
  187                 if (mtag == NULL)
  188                         return (ENOMEM);
  189                 m_tag_prepend(m, mtag);
  190         }
  191 
  192         *(uint8_t *)(mtag + 1) = prio;
  193 
  194         return (0);
  195 }
  196 
  197 #endif /* _KERNEL */
  198 
  199 #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