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
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18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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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>
33 #include <sys/malloc.h> /* for M_NOWAIT */
35 #include <sys/serialize.h>
38 #include <net/ethernet.h>
40 #include <net/if_arp.h>
41 #include <net/ifq_var.h>
42 #include <net/netmsg.h>
44 #include <net/vlan/if_vlan_var.h>
45 #include <net/vlan/if_vlan_ether.h>
48 vlan_start_dispatch(netmsg_t msg)
50 struct netmsg_packet *nmp = &msg->packet;
53 struct altq_pktattr pktattr;
55 char hexstr[HEX_NCPYLEN(sizeof(struct ether_vlan_header))];
58 ifp = msg->lmsg.u.ms_resultp;
61 KASSERT(m->m_flags & M_VLANTAG, ("mbuf has not been vlan tagged!"));
64 * If ALTQ is enabled on the parent interface, do
65 * classification; the queueing discipline might
66 * not require classification, but might require
67 * the address family/header pointer in the pktattr.
69 if (ifq_is_enabled(&ifp->if_snd))
70 altq_etherclassify(&ifp->if_snd, m, &pktattr);
73 * If underlying interface can do VLAN tag insertion itself,
74 * just pass the packet along.
76 if ((ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) {
77 uint16_t vlantag = m->m_pkthdr.ether_vlantag;
78 struct ether_vlan_header *evl;
80 M_PREPEND(m, EVL_ENCAPLEN, M_NOWAIT);
82 if_printf(ifp, "vlan%u M_PREPEND failed", vlantag);
85 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
87 m = m_pullup(m, ETHER_HDR_LEN + EVL_ENCAPLEN);
89 if_printf(ifp, "vlan%u m_pullup failed", vlantag);
92 m->m_pkthdr.csum_lhlen = sizeof(struct ether_vlan_header);
95 * Transform the Ethernet header into an Ethernet header
96 * with 802.1Q encapsulation.
98 bcopy(mtod(m, char *) + EVL_ENCAPLEN, mtod(m, char *),
99 sizeof(struct ether_header));
100 evl = mtod(m, struct ether_vlan_header *);
101 evl->evl_proto = evl->evl_encap_proto;
102 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
103 evl->evl_tag = htons(vlantag);
105 kprintf("vlan_start: %s\n", hexncpy((u_char *)evl, sizeof(*evl),
106 hexstr, HEX_NCPYLEN(sizeof(*evl)), ":"));
108 /* Hardware does not need to setup vlan tagging */
109 m->m_flags &= ~M_VLANTAG;
111 ifq_dispatch(ifp, m, &pktattr);
115 vlan_ether_ptap(struct bpf_if *bp, struct mbuf *m, uint16_t vlantag)
117 const struct ether_header *eh;
118 struct ether_vlan_header evh;
120 KASSERT(m->m_len >= ETHER_HDR_LEN,
121 ("ether header is not contiguous!"));
123 eh = mtod(m, const struct ether_header *);
124 m_adj(m, ETHER_HDR_LEN);
126 bcopy(eh, &evh, 2 * ETHER_ADDR_LEN);
127 evh.evl_encap_proto = htons(ETHERTYPE_VLAN);
128 evh.evl_tag = htons(vlantag);
129 evh.evl_proto = eh->ether_type;
130 bpf_ptap(bp, m, &evh, ETHER_HDR_LEN + EVL_ENCAPLEN);
132 /* XXX assumes data was left intact */
133 M_PREPEND(m, ETHER_HDR_LEN, M_WAITOK);
137 vlan_ether_decap(struct mbuf **m0)
139 struct mbuf *m = *m0;
140 struct ether_vlan_header *evh;
142 KKASSERT((m->m_flags & M_VLANTAG) == 0);
144 if (m->m_len < sizeof(*evh)) {
145 /* Error in the caller */
150 evh = mtod(m, struct ether_vlan_header *);
152 m->m_pkthdr.ether_vlantag = ntohs(evh->evl_tag);
153 m->m_flags |= M_VLANTAG;
155 bcopy((uint8_t *)evh, (uint8_t *)evh + EVL_ENCAPLEN,
157 m_adj(m, EVL_ENCAPLEN);