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