2 * Copyright 1998 Massachusetts Institute of Technology
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
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
29 * $FreeBSD: src/sys/net/if_vlan.c,v 1.15.2.13 2003/02/14 22:25:58 fenner Exp $
32 #include <sys/param.h>
34 #include <sys/serialize.h>
37 #include <net/ethernet.h>
39 #include <net/if_arp.h>
40 #include <net/ifq_var.h>
41 #include <net/netmsg.h>
43 #include <net/vlan/if_vlan_var.h>
44 #include <net/vlan/if_vlan_ether.h>
47 vlan_start_dispatch(netmsg_t msg)
49 struct netmsg_packet *nmp = &msg->packet;
52 struct altq_pktattr pktattr;
55 ifp = msg->lmsg.u.ms_resultp;
58 KASSERT(m->m_flags & M_VLANTAG, ("mbuf has not been vlan tagged!\n"));
60 ifnet_serialize_tx(ifp);
63 * Make sure that the interface is still UP and RUNNING,
64 * since interface state may have been changed when the
65 * mbuf is pending on the msgport.
67 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) !=
68 (IFF_UP | IFF_RUNNING)) {
74 * If ALTQ is enabled on the parent interface, do
75 * classification; the queueing discipline might
76 * not require classification, but might require
77 * the address family/header pointer in the pktattr.
79 if (ifq_is_enabled(&ifp->if_snd))
80 altq_etherclassify(&ifp->if_snd, m, &pktattr);
83 * If underlying interface can do VLAN tag insertion itself,
84 * just pass the packet along.
86 if ((ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
87 uint16_t vlantag = m->m_pkthdr.ether_vlantag;
88 struct ether_vlan_header *evl;
90 M_PREPEND(m, EVL_ENCAPLEN, MB_DONTWAIT);
92 if_printf(ifp, "vlan%u M_PREPEND failed", vlantag);
95 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
97 m = m_pullup(m, ETHER_HDR_LEN + EVL_ENCAPLEN);
99 if_printf(ifp, "vlan%u m_pullup failed", vlantag);
104 * Transform the Ethernet header into an Ethernet header
105 * with 802.1Q encapsulation.
107 bcopy(mtod(m, char *) + EVL_ENCAPLEN, mtod(m, char *),
108 sizeof(struct ether_header));
109 evl = mtod(m, struct ether_vlan_header *);
110 evl->evl_proto = evl->evl_encap_proto;
111 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
112 evl->evl_tag = htons(vlantag);
114 kprintf("vlan_start: %*D\n", (int)sizeof *evl,
115 (unsigned char *)evl, ":");
117 /* Hardware does not need to setup vlan tagging */
118 m->m_flags &= ~M_VLANTAG;
120 ifq_handoff(ifp, m, &pktattr);
122 ifnet_deserialize_tx(ifp);
126 vlan_ether_ptap(struct bpf_if *bp, struct mbuf *m, uint16_t vlantag)
128 const struct ether_header *eh;
129 struct ether_vlan_header evh;
131 KASSERT(m->m_len >= ETHER_HDR_LEN,
132 ("ether header is not contiguous!\n"));
134 eh = mtod(m, const struct ether_header *);
135 m_adj(m, ETHER_HDR_LEN);
137 bcopy(eh, &evh, 2 * ETHER_ADDR_LEN);
138 evh.evl_encap_proto = htons(ETHERTYPE_VLAN);
139 evh.evl_tag = htons(vlantag);
140 evh.evl_proto = eh->ether_type;
141 bpf_ptap(bp, m, &evh, ETHER_HDR_LEN + EVL_ENCAPLEN);
143 /* XXX assumes data was left intact */
144 M_PREPEND(m, ETHER_HDR_LEN, MB_WAIT);
148 vlan_ether_decap(struct mbuf **m0)
150 struct mbuf *m = *m0;
151 struct ether_vlan_header *evh;
153 KKASSERT((m->m_flags & M_VLANTAG) == 0);
155 if (m->m_len < sizeof(*evh)) {
156 /* Error in the caller */
161 evh = mtod(m, struct ether_vlan_header *);
163 m->m_pkthdr.ether_vlantag = ntohs(evh->evl_tag);
164 m->m_flags |= M_VLANTAG;
166 bcopy((uint8_t *)evh, (uint8_t *)evh + EVL_ENCAPLEN,
168 m_adj(m, EVL_ENCAPLEN);