mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-22 11:17:19 +00:00
Code Issues Releases Activity
f4779b9d6e
freebsd/sys/net/if_fwsubr.c
Julian Elischer 8b07e49a00 Add code to allow the system to handle multiple routing tables. 
This particular implementation is designed to be fully backwards compatible
and to be MFC-able to 7.x (and 6.x)

Currently the only protocol that can make use of the multiple tables is IPv4
Similar functionality exists in OpenBSD and Linux.

From my notes:

-----

  One thing where FreeBSD has been falling behind, and which by chance I
  have some time to work on is "policy based routing", which allows
  different
  packet streams to be routed by more than just the destination address.

  Constraints:
  ------------

  I want to make some form of this available in the 6.x tree
  (and by extension 7.x) , but FreeBSD in general needs it so I might as
  well do it in -current and back port the portions I need.

  One of the ways that this can be done is to have the ability to
  instantiate multiple kernel routing tables (which I will now
  refer to as "Forwarding Information Bases" or "FIBs" for political
  correctness reasons). Which FIB a particular packet uses to make
  the next hop decision can be decided by a number of mechanisms.
  The policies these mechanisms implement are the "Policies" referred
  to in "Policy based routing".

  One of the constraints I have if I try to back port this work to
  6.x is that it must be implemented as a EXTENSION to the existing
  ABIs in 6.x so that third party applications do not need to be
  recompiled in timespan of the branch.

  This first version will not have some of the bells and whistles that
  will come with later versions. It will, for example, be limited to 16
  tables in the first commit.
  Implementation method, Compatible version. (part 1)
  -------------------------------
  For this reason I have implemented a "sufficient subset" of a
  multiple routing table solution in Perforce, and back-ported it
  to 6.x. (also in Perforce though not  always caught up with what I
  have done in -current/P4). The subset allows a number of FIBs
  to be defined at compile time (8 is sufficient for my purposes in 6.x)
  and implements the changes needed to allow IPV4 to use them. I have not
  done the changes for ipv6 simply because I do not need it, and I do not
  have enough knowledge of ipv6 (e.g. neighbor discovery) needed to do it.

  Other protocol families are left untouched and should there be
  users with proprietary protocol families, they should continue to work
  and be oblivious to the existence of the extra FIBs.

  To understand how this is done, one must know that the current FIB
  code starts everything off with a single dimensional array of
  pointers to FIB head structures (One per protocol family), each of
  which in turn points to the trie of routes available to that family.

  The basic change in the ABI compatible version of the change is to
  extent that array to be a 2 dimensional array, so that
  instead of protocol family X looking at rt_tables[X] for the
  table it needs, it looks at rt_tables[Y][X] when for all
  protocol families except ipv4 Y is always 0.
  Code that is unaware of the change always just sees the first row
  of the table, which of course looks just like the one dimensional
  array that existed before.

  The entry points rtrequest(), rtalloc(), rtalloc1(), rtalloc_ign()
  are all maintained, but refer only to the first row of the array,
  so that existing callers in proprietary protocols can continue to
  do the "right thing".
  Some new entry points are added, for the exclusive use of ipv4 code
  called in_rtrequest(), in_rtalloc(), in_rtalloc1() and in_rtalloc_ign(),
  which have an extra argument which refers the code to the correct row.

  In addition, there are some new entry points (currently called
  rtalloc_fib() and friends) that check the Address family being
  looked up and call either rtalloc() (and friends) if the protocol
  is not IPv4 forcing the action to row 0 or to the appropriate row
  if it IS IPv4 (and that info is available). These are for calling
  from code that is not specific to any particular protocol. The way
  these are implemented would change in the non ABI preserving code
  to be added later.

  One feature of the first version of the code is that for ipv4,
  the interface routes show up automatically on all the FIBs, so
  that no matter what FIB you select you always have the basic
  direct attached hosts available to you. (rtinit() does this
  automatically).

  You CAN delete an interface route from one FIB should you want
  to but by default it's there. ARP information is also available
  in each FIB. It's assumed that the same machine would have the
  same MAC address, regardless of which FIB you are using to get
  to it.

  This brings us as to how the correct FIB is selected for an outgoing
  IPV4 packet.

  Firstly, all packets have a FIB associated with them. if nothing
  has been done to change it, it will be FIB 0. The FIB is changed
  in the following ways.

  Packets fall into one of a number of classes.

  1/ locally generated packets, coming from a socket/PCB.
     Such packets select a FIB from a number associated with the
     socket/PCB. This in turn is inherited from the process,
     but can be changed by a socket option. The process in turn
     inherits it on fork. I have written a utility call setfib
     that acts a bit like nice..

         setfib -3 ping target.example.com # will use fib 3 for ping.

     It is an obvious extension to make it a property of a jail
     but I have not done so. It can be achieved by combining the setfib and
     jail commands.

  2/ packets received on an interface for forwarding.
     By default these packets would use table 0,
     (or possibly a number settable in a sysctl(not yet)).
     but prior to routing the firewall can inspect them (see below).
     (possibly in the future you may be able to associate a FIB
     with packets received on an interface..  An ifconfig arg, but not yet.)

  3/ packets inspected by a packet classifier, which can arbitrarily
     associate a fib with it on a packet by packet basis.
     A fib assigned to a packet by a packet classifier
     (such as ipfw) would over-ride a fib associated by
     a more default source. (such as cases 1 or 2).

  4/ a tcp listen socket associated with a fib will generate
     accept sockets that are associated with that same fib.

  5/ Packets generated in response to some other packet (e.g. reset
     or icmp packets). These should use the FIB associated with the
     packet being reponded to.

  6/ Packets generated during encapsulation.
     gif, tun and other tunnel interfaces will encapsulate using the FIB
     that was in effect withthe proces that set up the tunnel.
     thus setfib 1 ifconfig gif0 [tunnel instructions]
     will set the fib for the tunnel to use to be fib 1.

  Routing messages would be associated with their
  process, and thus select one FIB or another.
  messages from the kernel would be associated with the fib they
  refer to and would only be received by a routing socket associated
  with that fib. (not yet implemented)

  In addition Netstat has been edited to be able to cope with the
  fact that the array is now 2 dimensional. (It looks in system
  memory using libkvm (!)). Old versions of netstat see only the first FIB.

  In addition two sysctls are added to give:
  a) the number of FIBs compiled in (active)
  b) the default FIB of the calling process.

  Early testing experience:
  -------------------------

  Basically our (IronPort's) appliance does this functionality already
  using ipfw fwd but that method has some drawbacks.

  For example,
  It can't fully simulate a routing table because it can't influence the
  socket's choice of local address when a connect() is done.

  Testing during the generating of these changes has been
  remarkably smooth so far. Multiple tables have co-existed
  with no notable side effects, and packets have been routes
  accordingly.

  ipfw has grown 2 new keywords:

  setfib N ip from anay to any
  count ip from any to any fib N

  In pf there seems to be a requirement to be able to give symbolic names to the
  fibs but I do not have that capacity. I am not sure if it is required.

  SCTP has interestingly enough built in support for this, called VRFs
  in Cisco parlance. it will be interesting to see how that handles it
  when it suddenly actually does something.

  Where to next:
  --------------------

  After committing the ABI compatible version and MFCing it, I'd
  like to proceed in a forward direction in -current. this will
  result in some roto-tilling in the routing code.

  Firstly: the current code's idea of having a separate tree per
  protocol family, all of the same format, and pointed to by the
  1 dimensional array is a bit silly. Especially when one considers that
  there is code that makes assumptions about every protocol having the
  same internal structures there. Some protocols don't WANT that
  sort of structure. (for example the whole idea of a netmask is foreign
  to appletalk). This needs to be made opaque to the external code.

  My suggested first change is to add routing method pointers to the
  'domain' structure, along with information pointing the data.
  instead of having an array of pointers to uniform structures,
  there would be an array pointing to the 'domain' structures
  for each protocol address domain (protocol family),
  and the methods this reached would be called. The methods would have
  an argument that gives FIB number, but the protocol would be free
  to ignore it.

  When the ABI can be changed it raises the possibilty of the
  addition of a fib entry into the "struct route". Currently,
  the structure contains the sockaddr of the desination, and the resulting
  fib entry. To make this work fully, one could add a fib number
  so that given an address and a fib, one can find the third element, the
  fib entry.

  Interaction with the ARP layer/ LL layer would need to be
  revisited as well. Qing Li has been working on this already.

  This work was sponsored by Ironport Systems/Cisco

Reviewed by:    several including rwatson, bz and mlair (parts each)
Obtained from:  Ironport systems/Cisco
2008-05-09 23:03:00 +00:00

857 lines
19 KiB
C
Raw Blame History

/*-
* 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.
*
* $FreeBSD$
*/
#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/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>
#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 rtentry *rt0)
{
struct fw_com *fc = IFP2FWC(ifp);
int error, type;
struct rtentry *rt = NULL;
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_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;
}
if (rt0 != NULL) {
error = rt_check_fib(&rt, &rt0, dst, rt0->rt_fibnum);
if (error)
goto bad;
RT_UNLOCK(rt);
}
/*
* 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_ifp, 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 (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]);
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.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]);
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;
/*
* 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;
}
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(&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);
Reference in New Issue View Git Blame Copy Permalink