sys/net/agr/ieee8023ad_marker.c

   1 /*      $NetBSD: ieee8023ad_marker.c,v 1.3 2005/12/11 12:24:54 christos 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 1.3 2005/12/11 12:24:54 christos 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             &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
 126 bad:
 127         m_freem(m);
 128         return EINVAL;
 129 }