FreeBSD/Linux Kernel Cross Reference
sys/net/if_fwsubr.c

     /*
      * Copyright (c) 2004 Doug Rabson
      * Copyright (c) 1982, 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/5.3/sys/net/if_fwsubr.c 136588 2004-10-16 08:43:07Z cvs2svn $
     */
    
    #include "opt_inet.h"
    #include "opt_inet6.h"
    #include "opt_mac.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/mac.h>
    #include <sys/malloc.h>
    #include <sys/mbuf.h>
    #include <sys/socket.h>
    #include <sys/sockio.h>
    
    #include <net/if.h>
    #include <net/netisr.h>
    #include <net/route.h>
    #include <net/if_llc.h>
    #include <net/if_dl.h>
    #include <net/if_types.h>
    #include <net/bpf.h>
    #include <net/firewire.h>
    
    #if defined(INET) || defined(INET6)
    #include <netinet/in.h>
    #include <netinet/in_var.h>
    #include <netinet/if_ether.h>
    #include <netinet/ip_fw.h>
    #include <netinet/ip_dummynet.h>
    #endif
    #ifdef INET6
    #include <netinet6/nd6.h>
    #endif
    
    #define IFP2FC(IFP) ((struct fw_com *)IFP)
    
    struct fw_hwaddr firewire_broadcastaddr = {
            0xffffffff,
            0xffffffff,
            0xff,
            0xff,
            0xffff,
            0xffffffff
    };
    
    static int
    firewire_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
        struct rtentry *rt0)
    {
            struct fw_com *fc = (struct fw_com *) ifp;
            int error, type;
            struct rtentry *rt;
            struct m_tag *mtag;
            union fw_encap *enc;
            struct fw_hwaddr *destfw;
            uint8_t speed;
            uint16_t psize, fsize, dsize;
            struct mbuf *mtail;
            int unicast, dgl, foff;
            static int next_dgl;
    
    #ifdef MAC
            error = mac_check_ifnet_transmit(ifp, m);
            if (error)
                    goto bad;
    #endif
    
            if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
                   error = ENETDOWN;
                   goto bad;
           }
   
           error = rt_check(&rt, &rt0, dst);
           if (error)
                   goto bad;
   
           /*
            * For unicast, we make a tag to store the lladdr of the
            * destination. This might not be the first time we have seen
            * the packet (for instance, the arp code might be trying to
            * re-send it after receiving an arp reply) so we only
            * allocate a tag if there isn't one there already. For
            * multicast, we will eventually use a different tag to store
            * the channel number.
            */
           unicast = !(m->m_flags & (M_BCAST | M_MCAST));
           if (unicast) {
                   mtag = m_tag_locate(m, MTAG_FIREWIRE, MTAG_FIREWIRE_HWADDR, NULL);
                   if (!mtag) {
                           mtag = m_tag_alloc(MTAG_FIREWIRE, MTAG_FIREWIRE_HWADDR,
                               sizeof (struct fw_hwaddr), M_NOWAIT);
                           if (!mtag) {
                                   error = ENOMEM;
                                   goto bad;
                           }
                           m_tag_prepend(m, mtag);
                   }
                   destfw = (struct fw_hwaddr *)(mtag + 1);
           } else {
                   destfw = 0;
           }
   
           switch (dst->sa_family) {
   #ifdef AF_INET
           case AF_INET:
                   /*
                    * Only bother with arp for unicast. Allocation of
                    * channels etc. for firewire is quite different and
                    * doesn't fit into the arp model.
                    */
                   if (unicast) {
                           error = arpresolve(ifp, rt, m, dst, (u_char *) destfw);
                           if (error)
                                   return (error == EWOULDBLOCK ? 0 : error);
                   }
                   type = ETHERTYPE_IP;
                   break;
   
           case AF_ARP:
           {
                   struct arphdr *ah;
                   ah = mtod(m, struct arphdr *);
                   ah->ar_hrd = htons(ARPHRD_IEEE1394);
                   type = ETHERTYPE_ARP;
                   if (unicast)
                           *destfw = *(struct fw_hwaddr *) ar_tha(ah);
   
                   /*
                    * The standard arp code leaves a hole for the target
                    * hardware address which we need to close up.
                    */
                   bcopy(ar_tpa(ah), ar_tha(ah), ah->ar_pln);
                   m_adj(m, -ah->ar_hln);
                   break;
           }
   #endif
   
   #ifdef INET6
           case AF_INET6:
                   if (unicast) {
                           error = nd6_storelladdr(&fc->fc_if, rt, m, dst,
                               (u_char *) destfw);
                           if (error)
                                   return (error);
                   }
                   type = ETHERTYPE_IPV6;
                   break;
   #endif
   
           default:
                   if_printf(ifp, "can't handle af%d\n", dst->sa_family);
                   error = EAFNOSUPPORT;
                   goto bad;
           }
   
           /*
            * Let BPF tap off a copy before we encapsulate.
            */
           if (ifp->if_bpf) {
                   struct fw_bpfhdr h;
                   if (unicast)
                           bcopy(destfw, h.firewire_dhost, 8);
                   else
                           bcopy(&firewire_broadcastaddr, h.firewire_dhost, 8);
                   bcopy(&fc->fc_hwaddr, h.firewire_shost, 8);
                   h.firewire_type = htons(type);
                   bpf_mtap2(ifp->if_bpf, &h, sizeof(h), m);
           }
   
           /*
            * Punt on MCAP for now and send all multicast packets on the
            * broadcast channel.
            */
           if (m->m_flags & M_MCAST)
                   m->m_flags |= M_BCAST;
   
           /*
            * Figure out what speed to use and what the largest supported
            * packet size is. For unicast, this is the minimum of what we
            * can speak and what they can hear. For broadcast, lets be
            * conservative and use S100. We could possibly improve that
            * by examining the bus manager's speed map or similar. We
            * also reduce the packet size for broadcast to account for
            * the GASP header.
            */
           if (unicast) {
                   speed = min(fc->fc_speed, destfw->sspd);
                   psize = min(512 << speed, 2 << destfw->sender_max_rec);
           } else {
                   speed = 0;
                   psize = 512 - 2*sizeof(uint32_t);
           }
   
           /*
            * Next, we encapsulate, possibly fragmenting the original
            * datagram if it won't fit into a single packet.
            */
           if (m->m_pkthdr.len <= psize - sizeof(uint32_t)) {
                   /*
                    * No fragmentation is necessary.
                    */
                   M_PREPEND(m, sizeof(uint32_t), M_DONTWAIT);
                   if (!m) {
                           error = ENOBUFS;
                           goto bad;
                   }
                   enc = mtod(m, union fw_encap *);
                   enc->unfrag.ether_type = type;
                   enc->unfrag.lf = FW_ENCAP_UNFRAG;
   
                   /*
                    * Byte swap the encapsulation header manually.
                    */
                   enc->ul[0] = htonl(enc->ul[0]);
   
                   IFQ_HANDOFF(ifp, m, error);
                   return (error);
           } else {
                   /*
                    * Fragment the datagram, making sure to leave enough
                    * space for the encapsulation header in each packet.
                    */
                   fsize = psize - 2*sizeof(uint32_t);
                   dgl = next_dgl++;
                   dsize = m->m_pkthdr.len;
                   foff = 0;
                   while (m) {
                           if (m->m_pkthdr.len > fsize) {
                                   /*
                                    * Split off the tail segment from the
                                    * datagram, copying our tags over.
                                    */
                                   mtail = m_split(m, fsize, M_DONTWAIT);
                                   m_tag_copy_chain(mtail, m, M_NOWAIT);
                           } else {
                                   mtail = 0;
                           }
   
                           /*
                            * Add our encapsulation header to this
                            * fragment and hand it off to the link.
                            */
                           M_PREPEND(m, 2*sizeof(uint32_t), M_DONTWAIT);
                           if (!m) {
                                   error = ENOBUFS;
                                   goto bad;
                           }
                           enc = mtod(m, union fw_encap *);
                           if (foff == 0) {
                                   enc->firstfrag.lf = FW_ENCAP_FIRST;
                                   enc->firstfrag.datagram_size = dsize - 1;
                                   enc->firstfrag.ether_type = type;
                                   enc->firstfrag.dgl = dgl;
                           } else {
                                   if (mtail)
                                           enc->nextfrag.lf = FW_ENCAP_NEXT;
                                   else
                                           enc->nextfrag.lf = FW_ENCAP_LAST;
                                   enc->nextfrag.datagram_size = dsize - 1;
                                   enc->nextfrag.fragment_offset = foff;
                                   enc->nextfrag.dgl = dgl;
                           }
                           foff += m->m_pkthdr.len - 2*sizeof(uint32_t);
   
                           /*
                            * Byte swap the encapsulation header manually.
                            */
                           enc->ul[0] = htonl(enc->ul[0]);
                           enc->ul[1] = htonl(enc->ul[1]);
   
                           IFQ_HANDOFF(ifp, m, error);
                           if (error) {
                                   if (mtail)
                                           m_freem(mtail);
                                   return (ENOBUFS);
                           }
   
                           m = mtail;
                   }
   
                   return (0);
           }
   
   bad:
           if (m)
                   m_freem(m);
           return (error);
   }
   
   static struct mbuf *
   firewire_input_fragment(struct fw_com *fc, struct mbuf *m, int src)
   {
           union fw_encap *enc;
           struct fw_reass *r;
           struct mbuf *mf, *mprev;
           int dsize;
           int fstart, fend, start, end, islast;
           uint32_t id;
   
           GIANT_REQUIRED;
   
           /*
            * Find an existing reassembly buffer or create a new one.
            */
           enc = mtod(m, union fw_encap *);
           id = enc->firstfrag.dgl | (src << 16);
           STAILQ_FOREACH(r, &fc->fc_frags, fr_link)
                   if (r->fr_id == id)
                           break;
           if (!r) {
                   r = malloc(sizeof(struct fw_reass), M_TEMP, M_NOWAIT);
                   if (!r) {
                           m_freem(m);
                           return 0;
                   }
                   r->fr_id = id;
                   r->fr_frags = 0;
                   STAILQ_INSERT_HEAD(&fc->fc_frags, r, fr_link);
           }
   
           /*
            * If this fragment overlaps any other fragment, we must discard
            * the partial reassembly and start again.
            */
           if (enc->firstfrag.lf == FW_ENCAP_FIRST)
                   fstart = 0;
           else
                   fstart = enc->nextfrag.fragment_offset;
           fend = fstart + m->m_pkthdr.len - 2*sizeof(uint32_t);
           dsize = enc->nextfrag.datagram_size;
           islast = (enc->nextfrag.lf == FW_ENCAP_LAST);
   
           for (mf = r->fr_frags; mf; mf = mf->m_nextpkt) {
                   enc = mtod(mf, union fw_encap *);
                   if (enc->nextfrag.datagram_size != dsize) {
                           /*
                            * This fragment must be from a different
                            * packet.
                            */
                           goto bad;
                   }
                   if (enc->firstfrag.lf == FW_ENCAP_FIRST)
                           start = 0;
                   else
                           start = enc->nextfrag.fragment_offset;
                   end = start + mf->m_pkthdr.len - 2*sizeof(uint32_t);
                   if ((fstart < end && fend > start) ||
                       (islast && enc->nextfrag.lf == FW_ENCAP_LAST)) {
                           /*
                            * Overlap - discard reassembly buffer and start
                            * again with this fragment.
                            */
                           goto bad;
                   }
           }
   
           /*
            * Find where to put this fragment in the list.
            */
           for (mf = r->fr_frags, mprev = NULL; mf;
               mprev = mf, mf = mf->m_nextpkt) {
                   enc = mtod(mf, union fw_encap *);
                   if (enc->firstfrag.lf == FW_ENCAP_FIRST)
                           start = 0;
                   else
                           start = enc->nextfrag.fragment_offset;
                   if (start >= fend)
                           break;
           }
   
           /*
            * If this is a last fragment and we are not adding at the end
            * of the list, discard the buffer.
            */
           if (islast && mprev && mprev->m_nextpkt)
                   goto bad;
   
           if (mprev) {
                   m->m_nextpkt = mprev->m_nextpkt;
                   mprev->m_nextpkt = m;
   
                   /*
                    * Coalesce forwards and see if we can make a whole
                    * datagram.
                    */
                   enc = mtod(mprev, union fw_encap *);
                   if (enc->firstfrag.lf == FW_ENCAP_FIRST)
                           start = 0;
                   else
                           start = enc->nextfrag.fragment_offset;
                   end = start + mprev->m_pkthdr.len - 2*sizeof(uint32_t);
                   while (end == fstart) {
                           /*
                            * Strip off the encap header from m and
                            * append it to mprev, freeing m.
                            */
                           m_adj(m, 2*sizeof(uint32_t));
                           mprev->m_nextpkt = m->m_nextpkt;
                           mprev->m_pkthdr.len += m->m_pkthdr.len;
                           m_cat(mprev, m);
   
                           if (mprev->m_pkthdr.len == dsize + 1 + 2*sizeof(uint32_t)) {
                                   /*
                                    * We have assembled a complete packet
                                    * we must be finished. Make sure we have
                                    * merged the whole chain.
                                    */
                                   STAILQ_REMOVE(&fc->fc_frags, r, fw_reass, fr_link);
                                   free(r, M_TEMP);
                                   m = mprev->m_nextpkt;
                                   while (m) {
                                           mf = m->m_nextpkt;
                                           m_freem(m);
                                           m = mf;
                                   }
                                   mprev->m_nextpkt = NULL;
   
                                   return (mprev);
                           }
   
                           /*
                            * See if we can continue merging forwards.
                            */
                           end = fend;
                           m = mprev->m_nextpkt;
                           if (m) {
                                   enc = mtod(m, union fw_encap *);
                                   if (enc->firstfrag.lf == FW_ENCAP_FIRST)
                                           fstart = 0;
                                   else
                                           fstart = enc->nextfrag.fragment_offset;
                                   fend = fstart + m->m_pkthdr.len
                                       - 2*sizeof(uint32_t);
                           } else {
                                   break;
                           }
                   }
           } else {
                   m->m_nextpkt = 0;
                   r->fr_frags = m;
           }
   
           return (0);
   
   bad:
           while (r->fr_frags) {
                   mf = r->fr_frags;
                   r->fr_frags = mf->m_nextpkt;
                   m_freem(mf);
           }
           m->m_nextpkt = 0;
           r->fr_frags = m;
   
           return (0);
   }
   
   void
   firewire_input(struct ifnet *ifp, struct mbuf *m, uint16_t src)
   {
           struct fw_com *fc = (struct fw_com *) ifp;
           union fw_encap *enc;
           int type, isr;
   
           GIANT_REQUIRED;
   
           /*
            * The caller has already stripped off the packet header
            * (stream or wreqb) and marked the mbuf's M_BCAST flag
            * appropriately. We de-encapsulate the IP packet and pass it
            * up the line after handling link-level fragmentation.
            */
           if (m->m_pkthdr.len < sizeof(uint32_t)) {
                   if_printf(ifp, "discarding frame without "
                       "encapsulation header (len %u pkt len %u)\n",
                       m->m_len, m->m_pkthdr.len);
           }
   
           m = m_pullup(m, sizeof(uint32_t));
           enc = mtod(m, union fw_encap *);
   
           /*
            * Byte swap the encapsulation header manually.
            */
           enc->ul[0] = htonl(enc->ul[0]);
   
           if (enc->unfrag.lf != 0) {
                   m = m_pullup(m, 2*sizeof(uint32_t));
                   if (!m)
                           return;
                   enc = mtod(m, union fw_encap *);
                   enc->ul[1] = htonl(enc->ul[1]);
                   m = firewire_input_fragment(fc, m, src);
                   if (!m)
                           return;
                   enc = mtod(m, union fw_encap *);
                   type = enc->firstfrag.ether_type;
                   m_adj(m, 2*sizeof(uint32_t));
           } else {
                   type = enc->unfrag.ether_type;
                   m_adj(m, sizeof(uint32_t));
           }
   
           if (m->m_pkthdr.rcvif == NULL) {
                   if_printf(ifp, "discard frame w/o interface pointer\n");
                   ifp->if_ierrors++;
                   m_freem(m);
                   return;
           }
   #ifdef DIAGNOSTIC
           if (m->m_pkthdr.rcvif != ifp) {
                   if_printf(ifp, "Warning, frame marked as received on %s\n",
                           m->m_pkthdr.rcvif->if_xname);
           }
   #endif
   
   #ifdef MAC
           /*
            * Tag the mbuf with an appropriate MAC label before any other
            * consumers can get to it.
            */
           mac_create_mbuf_from_ifnet(ifp, m);
   #endif
   
           /*
            * Give bpf a chance at the packet. The link-level driver
            * should have left us a tag with the EUID of the sender.
            */
           if (ifp->if_bpf) {
                   struct fw_bpfhdr h;
                   struct m_tag *mtag;
   
                   mtag = m_tag_locate(m, MTAG_FIREWIRE, MTAG_FIREWIRE_SENDER_EUID, 0);
                   if (mtag)
                           bcopy(mtag + 1, h.firewire_shost, 8);
                   else
                           bcopy(&firewire_broadcastaddr, h.firewire_dhost, 8);
                   bcopy(&fc->fc_hwaddr, h.firewire_dhost, 8);
                   h.firewire_type = htons(type);
                   bpf_mtap2(ifp->if_bpf, &h, sizeof(h), m);
           }
   
           if (ifp->if_flags & IFF_MONITOR) {
                   /*
                    * Interface marked for monitoring; discard packet.
                    */
                   m_freem(m);
                   return;
           }
   
           ifp->if_ibytes += m->m_pkthdr.len;
   
           /* Discard packet if interface is not up */
           if ((ifp->if_flags & IFF_UP) == 0) {
                   m_freem(m);
                   return;
           }
   
           if (m->m_flags & (M_BCAST|M_MCAST))
                   ifp->if_imcasts++;
   
           switch (type) {
   #ifdef INET
           case ETHERTYPE_IP:
                   if (ip_fastforward(m))
                           return;
                   isr = NETISR_IP;
                   break;
   
           case ETHERTYPE_ARP:
           {
                   struct arphdr *ah;
                   ah = mtod(m, struct arphdr *);
   
                   /*
                    * Adjust the arp packet to insert an empty tha slot.
                    */
                   m->m_len += ah->ar_hln;
                   m->m_pkthdr.len += ah->ar_hln;
                   bcopy(ar_tha(ah), ar_tpa(ah), ah->ar_pln);
                   isr = NETISR_ARP;
                   break;
           }
   #endif
   
   #ifdef INET6
           case ETHERTYPE_IPV6:
                   isr = NETISR_IPV6;
                   break;
   #endif
   
           default:
                   m_freem(m);
                   return;
           }
   
           netisr_dispatch(isr, m);
   }
   
   int
   firewire_ioctl(struct ifnet *ifp, int command, caddr_t data)
   {
           struct ifaddr *ifa = (struct ifaddr *) data;
           struct ifreq *ifr = (struct ifreq *) data;
           int error = 0;
   
           switch (command) {
           case SIOCSIFADDR:
                   ifp->if_flags |= IFF_UP;
   
                   switch (ifa->ifa_addr->sa_family) {
   #ifdef INET
                   case AF_INET:
                           ifp->if_init(ifp->if_softc);    /* before arpwhohas */
                           arp_ifinit(ifp, ifa);
                           break;
   #endif
                   default:
                           ifp->if_init(ifp->if_softc);
                           break;
                   }
                   break;
   
           case SIOCGIFADDR:
                   {
                           struct sockaddr *sa;
   
                           sa = (struct sockaddr *) & ifr->ifr_data;
                           bcopy(&IFP2FC(ifp)->fc_hwaddr,
                               (caddr_t) sa->sa_data, sizeof(struct fw_hwaddr));
                   }
                   break;
   
           case SIOCSIFMTU:
                   /*
                    * Set the interface MTU.
                    */
                   if (ifr->ifr_mtu > 1500) {
                           error = EINVAL;
                   } else {
                           ifp->if_mtu = ifr->ifr_mtu;
                   }
                   break;
           default:
                   error = EINVAL;                 /* XXX netbsd has ENOTTY??? */
                   break;
           }
           return (error);
   }
   
   static int
   firewire_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
       struct sockaddr *sa)
   {
   #ifdef INET
           struct sockaddr_in *sin;
   #endif
   #ifdef INET6
           struct sockaddr_in6 *sin6;
   #endif
   
           switch(sa->sa_family) {
           case AF_LINK:
                   /*
                    * No mapping needed.
                    */
                   *llsa = 0;
                   return 0;
   
   #ifdef INET
           case AF_INET:
                   sin = (struct sockaddr_in *)sa;
                   if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
                           return EADDRNOTAVAIL;
                   *llsa = 0;
                   return 0;
   #endif
   #ifdef INET6
           case AF_INET6:
                   sin6 = (struct sockaddr_in6 *)sa;
                   if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                           /*
                            * An IP6 address of 0 means listen to all
                            * of the Ethernet multicast address used for IP6.
                            * (This is used for multicast routers.)
                            */
                           ifp->if_flags |= IFF_ALLMULTI;
                           *llsa = 0;
                           return 0;
                   }
                   if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
                           return EADDRNOTAVAIL;
                   *llsa = 0;
                   return 0;
   #endif
   
           default:
                   /*
                    * Well, the text isn't quite right, but it's the name
                    * that counts...
                    */
                   return EAFNOSUPPORT;
           }
   }
   
   void
   firewire_ifattach(struct ifnet *ifp, struct fw_hwaddr *llc)
   {
           struct fw_com *fc = (struct fw_com *) ifp;
           struct ifaddr *ifa;
           struct sockaddr_dl *sdl;
           static const char* speeds[] = {
                   "S100", "S200", "S400", "S800",
                   "S1600", "S3200"
           };
   
           fc->fc_speed = llc->sspd;
           STAILQ_INIT(&fc->fc_frags);
   
           ifp->if_type = IFT_IEEE1394;
           ifp->if_addrlen = sizeof(struct fw_hwaddr);
           ifp->if_hdrlen = 0;
           if_attach(ifp);
           ifp->if_mtu = 1500;     /* XXX */
           ifp->if_output = firewire_output;
           ifp->if_resolvemulti = firewire_resolvemulti;
           ifp->if_broadcastaddr = (u_char *) &firewire_broadcastaddr;
   
           ifa = ifaddr_byindex(ifp->if_index);
           KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
           sdl = (struct sockaddr_dl *)ifa->ifa_addr;
           sdl->sdl_type = IFT_IEEE1394;
           sdl->sdl_alen = ifp->if_addrlen;
           bcopy(llc, LLADDR(sdl), ifp->if_addrlen);
   
           bpfattach(ifp, DLT_APPLE_IP_OVER_IEEE1394,
               sizeof(struct fw_hwaddr));
   
           if_printf(ifp, "Firewire address: %8D @ 0x%04x%08x, %s, maxrec %d\n",
               (uint8_t *) &llc->sender_unique_ID_hi, ":",
               ntohs(llc->sender_unicast_FIFO_hi),
               ntohl(llc->sender_unicast_FIFO_lo),
               speeds[llc->sspd],
               (2 << llc->sender_max_rec));
   }
   
   void
   firewire_ifdetach(struct ifnet *ifp)
   {
           bpfdetach(ifp);
           if_detach(ifp);
   }
   
   void
   firewire_busreset(struct ifnet *ifp)
   {
           struct fw_com *fc = (struct fw_com *) ifp;
           struct fw_reass *r;
           struct mbuf *m;
   
           /*
            * Discard any partial datagrams since the host ids may have changed.
            */
           while ((r = STAILQ_FIRST(&fc->fc_frags))) {
                   STAILQ_REMOVE_HEAD(&fc->fc_frags, fr_link);
                   while (r->fr_frags) {
                           m = r->fr_frags;
                           r->fr_frags = m->m_nextpkt;
                           m_freem(m);
                   }
                   free(r, M_TEMP);
           }
   }

Cache object: 0f4988a43e600d1610015fadae19d011