f137973487
According to 802.1Q-2014, VLAN tagged packets with VLAN id 0 should be considered as untagged, and only PCP and DEI values from the VLAN tag are meaningful. See for instance https://www.cisco.com/c/en/us/td/docs/switches/connectedgrid/cg-switch-sw-master/software/configuration/guide/vlan0/b_vlan_0.html. Make it possible to specify PCP value for outgoing packets on an ethernet interface. When PCP is supplied, the tag is appended, VLAN id set to 0, and PCP is filled by the supplied value. The code to do VLAN tag encapsulation is refactored from the if_vlan.c and moved into if_ethersubr.c. Drivers might have issues with filtering VID 0 packets on receive. This bug should be fixed for each driver. Reviewed by: ae (previous version), hselasky, melifaro Sponsored by: Mellanox Technologies MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D14702
161 lines
5.8 KiB
C
161 lines
5.8 KiB
C
/*-
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* Copyright 1998 Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby
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* granted, provided that both the above copyright notice and this
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* permission notice appear in all copies, that both the above
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* copyright notice and this permission notice appear in all
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* supporting documentation, and that the name of M.I.T. not be used
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* in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission. M.I.T. makes
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _NET_IF_VLAN_VAR_H_
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#define _NET_IF_VLAN_VAR_H_ 1
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/* Set the VLAN ID in an mbuf packet header non-destructively. */
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#define EVL_APPLY_VLID(m, vlid) \
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do { \
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if ((m)->m_flags & M_VLANTAG) { \
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(m)->m_pkthdr.ether_vtag &= EVL_VLID_MASK; \
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(m)->m_pkthdr.ether_vtag |= (vlid); \
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} else { \
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(m)->m_pkthdr.ether_vtag = (vlid); \
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(m)->m_flags |= M_VLANTAG; \
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} \
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} while (0)
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/* Set the priority ID in an mbuf packet header non-destructively. */
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#define EVL_APPLY_PRI(m, pri) \
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do { \
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if ((m)->m_flags & M_VLANTAG) { \
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uint16_t __vlantag = (m)->m_pkthdr.ether_vtag; \
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(m)->m_pkthdr.ether_vtag |= EVL_MAKETAG( \
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EVL_VLANOFTAG(__vlantag), (pri), \
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EVL_CFIOFTAG(__vlantag)); \
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} else { \
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(m)->m_pkthdr.ether_vtag = \
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EVL_MAKETAG(0, (pri), 0); \
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(m)->m_flags |= M_VLANTAG; \
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} \
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} while (0)
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/* sysctl(3) tags, for compatibility purposes */
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#define VLANCTL_PROTO 1
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#define VLANCTL_MAX 2
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/*
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* Configuration structure for SIOCSETVLAN and SIOCGETVLAN ioctls.
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*/
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struct vlanreq {
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char vlr_parent[IFNAMSIZ];
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u_short vlr_tag;
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};
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#define SIOCSETVLAN SIOCSIFGENERIC
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#define SIOCGETVLAN SIOCGIFGENERIC
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#define SIOCGVLANPCP SIOCGLANPCP /* Get VLAN PCP */
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#define SIOCSVLANPCP SIOCSLANPCP /* Set VLAN PCP */
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#ifdef _KERNEL
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/*
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* Drivers that are capable of adding and removing the VLAN header
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* in hardware indicate they support this by marking IFCAP_VLAN_HWTAGGING
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* in if_capabilities. Drivers for hardware that is capable
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* of handling larger MTU's that may include a software-appended
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* VLAN header w/o lowering the normal MTU should mark IFCAP_VLAN_MTU
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* in if_capabilities; this notifies the VLAN code it can leave the
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* MTU on the vlan interface at the normal setting.
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*/
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/*
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* VLAN tags are stored in host byte order. Byte swapping may be
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* necessary.
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*
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* Drivers that support hardware VLAN tag stripping fill in the
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* received VLAN tag (containing both vlan and priority information)
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* into the ether_vtag mbuf packet header field:
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*
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* m->m_pkthdr.ether_vtag = vtag; // ntohs()?
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* m->m_flags |= M_VLANTAG;
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*
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* to mark the packet m with the specified VLAN tag.
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*
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* On output the driver should check the mbuf for the M_VLANTAG
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* flag to see if a VLAN tag is present and valid:
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*
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* if (m->m_flags & M_VLANTAG) {
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* ... = m->m_pkthdr.ether_vtag; // htons()?
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* ... pass tag to hardware ...
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* }
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*
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* Note that a driver must indicate it supports hardware VLAN
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* stripping/insertion by marking IFCAP_VLAN_HWTAGGING in
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* if_capabilities.
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*/
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/*
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* The 802.1q code may also tag mbufs with the PCP (priority) field for use in
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* other layers of the stack, in which case an m_tag will be used. This is
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* semantically quite different from use of the ether_vtag field, which is
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* defined only between the device driver and VLAN layer.
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*/
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#define MTAG_8021Q 1326104895
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#define MTAG_8021Q_PCP_IN 0 /* Input priority. */
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#define MTAG_8021Q_PCP_OUT 1 /* Output priority. */
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#define VLAN_CAPABILITIES(_ifp) do { \
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if ((_ifp)->if_vlantrunk != NULL) \
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(*vlan_trunk_cap_p)(_ifp); \
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} while (0)
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#define VLAN_TRUNKDEV(_ifp) \
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((_ifp)->if_type == IFT_L2VLAN ? (*vlan_trunkdev_p)((_ifp)) : NULL)
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#define VLAN_TAG(_ifp, _vid) \
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((_ifp)->if_type == IFT_L2VLAN ? (*vlan_tag_p)((_ifp), (_vid)) : EINVAL)
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#define VLAN_COOKIE(_ifp) \
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((_ifp)->if_type == IFT_L2VLAN ? (*vlan_cookie_p)((_ifp)) : NULL)
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#define VLAN_SETCOOKIE(_ifp, _cookie) \
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((_ifp)->if_type == IFT_L2VLAN ? \
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(*vlan_setcookie_p)((_ifp), (_cookie)) : EINVAL)
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#define VLAN_DEVAT(_ifp, _vid) \
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((_ifp)->if_vlantrunk != NULL ? (*vlan_devat_p)((_ifp), (_vid)) : NULL)
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extern void (*vlan_trunk_cap_p)(struct ifnet *);
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extern struct ifnet *(*vlan_trunkdev_p)(struct ifnet *);
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extern struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t);
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extern int (*vlan_tag_p)(struct ifnet *, uint16_t *);
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extern int (*vlan_setcookie_p)(struct ifnet *, void *);
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extern void *(*vlan_cookie_p)(struct ifnet *);
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#ifdef _SYS_EVENTHANDLER_H_
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/* VLAN state change events */
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typedef void (*vlan_config_fn)(void *, struct ifnet *, uint16_t);
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typedef void (*vlan_unconfig_fn)(void *, struct ifnet *, uint16_t);
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EVENTHANDLER_DECLARE(vlan_config, vlan_config_fn);
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EVENTHANDLER_DECLARE(vlan_unconfig, vlan_unconfig_fn);
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#endif /* _SYS_EVENTHANDLER_H_ */
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#endif /* _KERNEL */
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#endif /* _NET_IF_VLAN_VAR_H_ */
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