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6ee20ab521
a packet has VLAN mbuf tag attached. This is faster to check than m_tag_locate(), and allows us to use the tags in non-vlan(4) VLAN producers. The first argument to VLAN_OUTPUT_TAG() is now unused but retained for backward compatibility. While here, embellish a fix in rev. 1.174 of if_ethersubr.c -- it now checks for packets with VLAN (mbuf) tags, and it should now be possible to bridge(4) on vlan(4)'s whose parent interfaces support VLAN decapsulation in hardware. Reviewed by: sam
120 lines
4.1 KiB
C
120 lines
4.1 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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struct ether_vlan_header {
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u_char evl_dhost[ETHER_ADDR_LEN];
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u_char evl_shost[ETHER_ADDR_LEN];
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u_int16_t evl_encap_proto;
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u_int16_t evl_tag;
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u_int16_t evl_proto;
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};
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#define EVL_VLID_MASK 0x0FFF
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#define EVL_VLANOFTAG(tag) ((tag) & EVL_VLID_MASK)
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#define EVL_PRIOFTAG(tag) (((tag) >> 13) & 7)
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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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#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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* Drivers that support hardware VLAN tagging pass a packet's tag
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* up through the stack by appending a packet tag with this value.
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* Output is handled likewise, the driver must locate the packet
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* tag to extract the VLAN tag. The following macros are used to
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* do this work. On input, do:
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*
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* VLAN_INPUT_TAG(ifp, m, tag,);
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*
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* to mark the packet m with the specified VLAN tag. The last
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* parameter provides code to execute in case of an error. On
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* output the driver should check mbuf to see if a VLAN tag is
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* present and only then check for a tag; this is done with:
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*
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* struct m_tag *mtag;
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* mtag = VLAN_OUTPUT_TAG(ifp, m);
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* if (mtag != NULL) {
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* ... = VLAN_TAG_VALUE(mtag);
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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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* tagging by marking IFCAP_VLAN_HWTAGGING in if_capabilities.
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*/
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#define MTAG_VLAN 1035328035
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#define MTAG_VLAN_TAG 0 /* tag of VLAN interface */
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#define VLAN_INPUT_TAG(_ifp, _m, _t, _errcase) do { \
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struct m_tag *mtag; \
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mtag = m_tag_alloc(MTAG_VLAN, MTAG_VLAN_TAG, \
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sizeof (u_int), M_NOWAIT); \
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if (mtag == NULL) { \
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(_ifp)->if_ierrors++; \
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m_freem(_m); \
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_errcase; \
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} \
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*(u_int *)(mtag+1) = (_t); \
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m_tag_prepend((_m), mtag); \
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(_m)->m_flags |= M_VLANTAG; \
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} while (0)
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#define VLAN_OUTPUT_TAG(_ifp, _m) \
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((_m)->m_flags & M_VLANTAG ? \
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m_tag_locate((_m), MTAG_VLAN, MTAG_VLAN_TAG, NULL) : NULL)
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#define VLAN_TAG_VALUE(_mt) (*(u_int *)((_mt)+1))
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#endif /* _KERNEL */
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#endif /* _NET_IF_VLAN_VAR_H_ */
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