1 /* $NetBSD: ieee8023ad_marker.c,v 1.4 2007/02/22 06:20:16 thorpej Exp $ */
2
3 /*-
4 * Copyright (c)2005 YAMAMOTO Takashi,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: ieee8023ad_marker.c,v 1.4 2007/02/22 06:20:16 thorpej Exp $");
31
32 #include <sys/param.h>
33 #include <sys/callout.h>
34 #include <sys/mbuf.h>
35 #include <sys/systm.h>
36
37 #include <net/if.h>
38 #include <net/if_ether.h>
39
40 #include <net/agr/if_agrvar_impl.h>
41 #include <net/agr/ieee8023_slowprotocols.h>
42 #include <net/agr/ieee8023_tlv.h>
43 #include <net/agr/ieee8023ad.h>
44 #include <net/agr/ieee8023ad_marker.h>
45
46 static const struct tlv_template marker_info_tlv_template[] = {
47 { MARKER_TYPE_INFO, 16 },
48 { 0, 0 },
49 };
50
51 static const struct tlv_template marker_response_tlv_template[] = {
52 { MARKER_TYPE_RESPONSE, 16 },
53 { 0, 0 },
54 };
55
56 int
ieee8023ad_marker_input(struct ifnet * ifp,struct mbuf * m)57 ieee8023ad_marker_input(struct ifnet *ifp, struct mbuf *m)
58 {
59 struct markerdu *mdu;
60 struct agr_port *port;
61 int error = 0;
62
63 port = ifp->if_agrprivate; /* XXX race with agr_remport. */
64 KASSERT(port);
65 if (__predict_false(port->port_flags & AGRPORT_DETACHING)) {
66 goto bad;
67 }
68
69 if (m->m_pkthdr.len != sizeof(*mdu)) {
70 goto bad;
71 }
72
73 if ((m->m_flags & M_MCAST) == 0) {
74 goto bad;
75 }
76
77 if (m->m_len < sizeof(*mdu)) {
78 m = m_pullup(m, sizeof(*mdu));
79 if (m == NULL) {
80 return ENOMEM;
81 }
82 }
83
84 mdu = mtod(m, struct markerdu *);
85
86 if (memcmp(&mdu->mdu_eh.ether_dhost,
87 ðermulticastaddr_slowprotocols, ETHER_ADDR_LEN)) {
88 goto bad;
89 }
90
91 KASSERT(mdu->mdu_sph.sph_subtype == SLOWPROTOCOLS_SUBTYPE_MARKER);
92 if (mdu->mdu_sph.sph_version != 1) {
93 goto bad;
94 }
95
96 switch (mdu->mdu_tlv.tlv_type) {
97 case MARKER_TYPE_INFO:
98 if (tlv_check(mdu, sizeof(*mdu), &mdu->mdu_tlv,
99 marker_info_tlv_template, true)) {
100 goto bad;
101 }
102 mdu->mdu_tlv.tlv_type = MARKER_TYPE_RESPONSE;
103 memcpy(&mdu->mdu_eh.ether_dhost,
104 ðermulticastaddr_slowprotocols, ETHER_ADDR_LEN);
105 memcpy(&mdu->mdu_eh.ether_shost,
106 &port->port_origlladdr, ETHER_ADDR_LEN);
107 error = agr_xmit_frame(ifp, m);
108 break;
109
110 case MARKER_TYPE_RESPONSE:
111 if (tlv_check(mdu, sizeof(*mdu), &mdu->mdu_tlv,
112 marker_response_tlv_template, true)) {
113 goto bad;
114 }
115 /*
116 * we are not interested in responses as
117 * we don't have a marker sender.
118 */
119 /* FALLTHROUGH */
120 default:
121 goto bad;
122 }
123
124 return error;
125
126 bad:
127 m_freem(m);
128 return EINVAL;
129 }
130