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_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 ifnet to see if any VLANs are 84 * in use and only then check for a packet 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 #define VLAN_INPUT_TAG(_ifp, _m, _t, _errcase) do { \ 100 struct m_tag *mtag; \ 101 mtag = m_tag_alloc(MTAG_VLAN, MTAG_VLAN_TAG, \ 102 sizeof (u_int), M_NOWAIT); \ 103 if (mtag == NULL) { \ 104 (_ifp)->if_ierrors++; \ 105 m_freem(_m); \ 106 _errcase; \ 107 } \ 108 *(u_int *)(mtag+1) = (_t); \ 109 m_tag_prepend((_m), mtag); \ 110 } while (0) 111 112 #define VLAN_OUTPUT_TAG(_ifp, _m) \ 113 ((_ifp)->if_nvlans != 0 ? \ 114 m_tag_locate((_m), MTAG_VLAN, MTAG_VLAN_TAG, NULL) : NULL) 115 #define VLAN_TAG_VALUE(_mt) (*(u_int *)((_mt)+1)) 116 #endif /* _KERNEL */ 117 118 #endif /* _NET_IF_VLAN_VAR_H_ */ 119