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_ */ 200