1/*	$NetBSD: ieee8023ad_marker.c,v 1.6 2021/11/30 01:17:02 yamaguchi 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 1.6 2021/11/30 01:17:02 yamaguchi 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#include <net/ether_slowprotocols.h>
40
41#include <net/agr/if_agrvar_impl.h>
42#include <net/agr/ieee8023_tlv.h>
43#include <net/agr/ieee8023ad.h>
44#include <net/agr/ieee8023ad_marker.h>
45
46static const struct tlv_template marker_info_tlv_template[] = {
47	{ MARKER_TYPE_INFO, 16 },
48	{ 0, 0 },
49};
50
51static const struct tlv_template marker_response_tlv_template[] = {
52	{ MARKER_TYPE_RESPONSE, 16 },
53	{ 0, 0 },
54};
55
56int
57ieee8023ad_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_lagg; /* 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	    &ethermulticastaddr_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		    &ethermulticastaddr_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
126bad:
127	m_freem(m);
128	return EINVAL;
129}
130