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/*-
* 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: release/9.1.0/sys/net/if_fwsubr.c 223741 2011-07-03 16:08:38Z bz $
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.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>
#include <net/if_llatbl.h>
#if defined(INET) || defined(INET6)
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#endif
#ifdef INET6
#include <netinet6/nd6.h>
#endif
#include <security/mac/mac_framework.h>
MALLOC_DEFINE(M_FWCOM, "fw_com", "firewire interface internals");
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 route *ro)
{
struct fw_com *fc = IFP2FWC(ifp);
int error, type;
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;
#if defined(INET) || defined(INET6)
struct llentry *lle;
#endif
#ifdef MAC
error = mac_ifnet_check_transmit(ifp, m);
if (error)
goto bad;
#endif
if (!((ifp->if_flags & IFF_UP) &&
(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
error = ENETDOWN;
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 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, ro ? ro->ro_rt : NULL, m, dst, (u_char *) destfw, &lle);
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_ifp, m, dst,
(u_char *) destfw, &lle);
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 (bpf_peers_present(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;
enc->unfrag.reserved = 0;
/*
* Byte swap the encapsulation header manually.
*/
enc->ul[0] = htonl(enc->ul[0]);
error = (ifp->if_transmit)(ifp, m);
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.reserved1 = 0;
enc->firstfrag.reserved2 = 0;
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.reserved1 = 0;
enc->nextfrag.reserved2 = 0;
enc->nextfrag.reserved3 = 0;
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]);
error = (ifp->if_transmit)(ifp, m);
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;
/*
* 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 = IFP2FWC(ifp);
union fw_encap *enc;
int type, isr;
/*
* 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));
if (m == NULL)
return;
enc = mtod(m, union fw_encap *);
/*
* Byte swap the encapsulation header manually.
*/
enc->ul[0] = ntohl(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] = ntohl(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_ifnet_create_mbuf(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 (bpf_peers_present(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 ((m = ip_fastforward(m)) == NULL)
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;
}
M_SETFIB(m, ifp->if_fib);
netisr_dispatch(isr, m);
}
int
firewire_ioctl(struct ifnet *ifp, u_long 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(&IFP2FWC(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 = IFP2FWC(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_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 = ifp->if_addr;
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 = IFP2FWC(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);
}
}
static void *
firewire_alloc(u_char type, struct ifnet *ifp)
{
struct fw_com *fc;
fc = malloc(sizeof(struct fw_com), M_FWCOM, M_WAITOK | M_ZERO);
fc->fc_ifp = ifp;
return (fc);
}
static void
firewire_free(void *com, u_char type)
{
free(com, M_FWCOM);
}
static int
firewire_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
if_register_com_alloc(IFT_IEEE1394,
firewire_alloc, firewire_free);
break;
case MOD_UNLOAD:
if_deregister_com_alloc(IFT_IEEE1394);
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t firewire_mod = {
"if_firewire",
firewire_modevent,
0
};
DECLARE_MODULE(if_firewire, firewire_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
MODULE_VERSION(if_firewire, 1);