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 |
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 | |