Commit Graph

640 Commits

Author SHA1 Message Date
Randall Stewart
bff64a4db3 - fixed several places where we did not release INP locks.
- fixed a refcount bug in the new ifa structures.
- use vrf's from default stcb or inp whenever possible.
- Address limits raised to account for a full IP fragmented
  packet (1000 addresses).
- flight size correcting updated to include one message only
  and to handle case where the peer does not cumack the
  next segment aka lists 1/1 in sack blocks..
- Various bad init/init-ack handling could cause a panic
  since we tried to unlock the destroyed mutex. Fixes
  so we properly exit when we need to destroy an assoc.
  (Found by Cisco DevTest team :D)
- name rename in src-addr-selection from pass to sifa.
- route structure typedef'd to allow different platforms
  and updated into sctp_os_bsd file.
- Max retransmissions a chunk can be made added.
Reviewed by:	gnn
2007-04-03 11:15:32 +00:00
John Baldwin
4e7f640dfb Optimize sx locks to use simple atomic operations for the common cases of
obtaining and releasing shared and exclusive locks.  The algorithms for
manipulating the lock cookie are very similar to that rwlocks.  This patch
also adds support for exclusive locks using the same algorithm as mutexes.

A new sx_init_flags() function has been added so that optional flags can be
specified to alter a given locks behavior.  The flags include SX_DUPOK,
SX_NOWITNESS, SX_NOPROFILE, and SX_QUITE which are all identical in nature
to the similar flags for mutexes.

Adaptive spinning on select locks may be enabled by enabling the
ADAPTIVE_SX kernel option.  Only locks initialized with the SX_ADAPTIVESPIN
flag via sx_init_flags() will adaptively spin.

The common cases for sx_slock(), sx_sunlock(), sx_xlock(), and sx_xunlock()
are now performed inline in non-debug kernels.  As a result, <sys/sx.h> now
requires <sys/lock.h> to be included prior to <sys/sx.h>.

The new kernel option SX_NOINLINE can be used to disable the aforementioned
inlining in non-debug kernels.

The size of struct sx has changed, so the kernel ABI is probably greatly
disturbed.

MFC after:	1 month
Submitted by:	attilio
Tested by:	kris, pjd
2007-03-31 23:23:42 +00:00
Randall Stewart
5e54f665f0 - Found bug in min split point bundling which caused
incorrect, non-bundlable fragmentation.
- Added min residual to better control split points for
  both how big a msg must be as well as how much needs
  to be left over.
- With our new algo in place, we need to implicitly
  set "end of msg" on the sp-> structure otherwise we
  end up with "hung" associations.
- Room reserved up front in IP header by pushing IP
  header to back of mbuf.
- Fix so FR's peg count of retransmissions needed.
- Fix so an unlucky chunk that never gets across
  will kill the assoc via the kill timer and send an
  abort too.
- Fix bug in sctp_input which can result in a crash.
- Do not strip off IP options anymore.
- Clean up sctp_calculate_rto().
- Get rid of unused sysctl.
- Fixed so we discard all M-Cast
- Fixed so port check done AFTER checksum
- Fixed bug in fragmentation code that prevented
  us from fragmenting a small complete message when
  we needed to.
- Window probes were not marked back to unsent and
  flight adjusted when a sack came in with no
  window change or accepting of the probe data.
  We now fix this with having a mark on the net and
  the chunk so we can clear it out when the sack arrives
  forcing it to retran just like it was "new" this
  improves the handling of window probes, which were
  dropped by the receiver.
- Tighten AUTH protocol error checks during INIT/INIT-ACK exchange
2007-03-31 11:47:30 +00:00
Bruce M Simpson
ec002fee99 Implement reference counting for ifmultiaddr, in_multi, and in6_multi
structures. Detect when ifnet instances are detached from the network
stack and perform appropriate cleanup to prevent memory leaks.

This has been implemented in such a way as to be backwards ABI compatible.
Kernel consumers are changed to use if_delmulti_ifma(); in_delmulti()
is unable to detect interface removal by design, as it performs searches
on structures which are removed with the interface.

With this architectural change, the panics FreeBSD users have experienced
with carp and pfsync should be resolved.

Obtained from:	p4 branch bms_netdev
Reviewed by:	andre
Sponsored by:	Garance A Drosehn
Idea from:	NetBSD
MFC after:	1 month
2007-03-20 00:36:10 +00:00
Randall Stewart
132dea7d5a - errno -> becomes error in sctp_output.c and sctputil.c
- SB_CLEAR macro defined and used for sb clearing.
- Fix for CMT express_sack_handling did not do proper
  pseudo-cumack updates.
- Get rid of extraneous function that was never used ip_2_ip6_hdr()
- Fixed source address selection bug (initialization problem).
- Source address selection debug added.
2007-03-19 06:53:02 +00:00
Randall Stewart
42551e993f - Sysctl's move to seperate file
- moved away from ifn/ifa access to sctp_ifa/sctp_ifn
  built and managed by the add-ip code.
- cleaned up add-ip code to use the iterator
- made iterator be a thread, which enables auto-asconf now.
- rewrote and cleaned up source address selection (also
  made it use new structures).
- Fixed a couple of memory leaks.
- DACK now settable as to how many packets to delay as
  well as time.
- connectx() to latest socket API, new associd arg.
- Fixed issue with revoking and loosing potential to
  send when we inflate the flight size. We now inflate
  the cwnd too and deflate it later when the revoked
  chunk is sent or acked.
- Got rid of some temp debug code
- src addr selection moved to a common file (sctp_output.c)
- Support for simple VRF's (we have support for multi-vfr
  via compile switch that is scrubbed from BSD but we won't
  need multi-vrf until we first get VRF :-D)
- Rest of mib work for address information now done
- Limit number of addresses in INIT/INIT-ACK to
  a #def (30).

Reviewed by:	gnn
2007-03-15 11:27:14 +00:00
Bruce M Simpson
00cf3f55fb Add comments about common idioms for cleanup pass at a later date. 2007-02-28 21:58:37 +00:00
Bruce M Simpson
cd88c37218 Remove code which would never be used, viz a viz Quality-of-Service;
the token bucket filter got killed in netinet, so it gets killed here
too. Correct comments.
2007-02-28 20:32:25 +00:00
Bruce M Simpson
430fc8f211 Add a comment about a struct which needs to be global.
Remove an unused global variable.
Staticize variables which do not need to be global.
2007-02-28 20:29:20 +00:00
Bruce M Simpson
1291e2a0eb Fix tinderbox. ip6_mrouter should be defined in raw_ip6.c as it is
tested to determine if the userland socket is open; this, in turn, is
used to determine if the module has been loaded.

Tested with:	LINT
2007-02-24 21:09:35 +00:00
Bruce M Simpson
6be2e366d6 Make IPv6 multicast forwarding dynamically loadable from a GENERIC kernel.
It is built in the same module as IPv4 multicast forwarding, i.e. ip_mroute.ko,
if and only if IPv6 support is enabled for loadable modules.
Export IPv6 forwarding structs to userland netstat(1) via sysctl(9).
2007-02-24 11:38:47 +00:00
Robert Watson
afdb42748d Rename two identically named log_in_vain variables: tcp_input.c's static
log_in_vain to tcp_log_in_vain, and udp_usrreq's global log_in_vain to
udp_log_in_vain.

MFC after:	1 week
2007-02-20 10:20:03 +00:00
Randall Stewart
f42a358a6f - Copyright updates (aka 2007)
- ZONE get now also take a type cast so it does the
  cast like mtod does.
- New macro SCTP_LIST_EMPTY, which in bsd is just
  LIST_EMPTY
- Removal of const in some of the static hmac functions
  (not needed)
- Store length changes to allow for new fields in auth
- Auth code updated to current draft (this should be the
  RFC version we think).
- use uint8_t instead of u_char in LOOPBACK address comparison
- Some u_int32_t converted to uint32_t (in crc code)
- A bug was found in the mib counts for ordered/unordered
  count, this was fixed (was referencing a freed mbuf).
- SCTP_ASOCLOG_OF_TSNS added (code will probably disappear
  after my testing completes. It allows us to keep a
  small log on each assoc of the last 40 TSN's in/out and
  stream assignment. It is NOT in options and so is only
  good for private builds.
- Some CMT changes in prep for Jana fixing his problem
  with reneging when CMT is enabled (Concurrent Multipath
  Transfer = CMT).
- Some missing mib stats added.
- Correction to number of open assoc's count in mib
- Correction to os_bsd.h to get right sha2 macros
- Add of special AUTH_04 flags so you can compile the code
  with the old format (in case the peer does not yet support
  the latest auth code).
- Nonce sum was incorrectly being set in when ecn_nonce was
  NOT on.
- LOR in listen with implicit bind found and fixed.
- Moved away from using mbuf's for socket options to using
  just data pointers. The mbufs were used to harmonize
  NetBSD code since both Net and Open used this method. We
  have decided to move away from that and more conform to
  FreeBSD style (which makes more sense).
- Very very nasty bug found in some of my "debug" code. The
  cookie_how collision case tracking had an endless loop in
  it if you got a second retransmission of a cookie collision
  case. This would lock up  a CPU .. ugly..
- auth function goes to using size_t instead of int which
  conforms to socketapi better
- Found the nasty bug that happens after 9 days of testing.. you
  get the data chunk, deliver it and due to the reference to a ch->
  that every now and then has been deleted (depending on the postion
  in the mbuf) you have an invalid ch->ch.flags.. and thus you don't
  advance the stream sequence number.. so you block the stream
  permanently. The fix is to make local variables of these guys
  and set them up before you have any chance of trimming the
  mbuf.
- style fix in sctp_util.h, not sure how this got bad maybe in
  the last patch? (aka it may not be in the real source).
- Found interesting bug when using the extended snd/rcv info where
  we would get an error on receiving with this. Thats because
  it was NOT padded to the same size as the snd_rcv info. We
  increase (add the pad) so the two structs are the same size
  in sctp_uio.h
- In sctp_usrreq.c one of the most common things we did for
  socket options was to cast the pointer and validate the size.
  This as been macro-ized to help make the code more readable.
- in sctputil.c two things, the socketapi class found a missing
  flag type (the next msg is a notification) and a missing
  scope recovery was also fixed.

Reviewed by:	gnn
2007-02-12 23:24:31 +00:00
Bruce M Simpson
31a9460383 In the ICMP6 path to handle FQDN 'who-are-you' queries, check that the
packet header mbuf is non-NULL before trying to create a duplicate of it.

PR:		95957
Reviewed by:	ume
MFC after:	3 days
2007-02-10 12:25:19 +00:00
Bruce M Simpson
6ede684320 MFC after: 3 days 2007-02-05 11:05:41 +00:00
Hajimu UMEMOTO
c57086ced7 ng_iface requiers neighbor cache as well.
MFC after:	3 days
2007-02-03 09:34:36 +00:00
Bruce A. Mah
f234bea7d7 Revert nd6.c revs. 1.67, 1.68, 1.69, 1.70 in an attempt to unbreak
IPv6 over point-to-point gif(4) tunnels.

These revisions caused a host route to the destination of a
point-to-point gif(4) interface to not get installed when the interface
and destination addresses were assigned.  This caused
"no route to host" errors when trying to send traffic over the
interface.  The first packet arriving inbound over the tunnel,
however, would cause the correct route to get installed, allowing
subsequent outbound traffic to be routed correctly.

gif(4) interfaces with prefix lengths of less than 128 bits
(i.e. no explicit destination address assigned) were not affected
by this bug.

This bug fix is a possible candidate for a 6.2-RELEASE errata note.

Approved by:	jhay (original committer)
Discussed with:	jhay, JINMEI Tatuya
MFC after:	3 days
2007-01-26 23:22:58 +00:00
Randall Stewart
93164cf98c - most all includes (#include <>) migrate to the sctp_os_bsd.h file
- Finally all splxx() are removed
 - Count error fixed in mapping array which might
   cause a wrong cumack generation.
 - Invariants around panic for case D + printf when no invariants.
 - one-to-one model race condition fixed by using
   a pre-formed connection and then completing the
   work so accept won't happen on a non-formed
   association.
 - Some additional paranoia checks in sctp_output.
 - Locks that were missing in the accept code.

Approved by:	gnn
2007-01-18 09:58:43 +00:00
Hajimu UMEMOTO
6a550ab34b Avoid infinite loop if nicmp6 and nip6 are not on the same mbuf.
NetBSD PR 34994+35333

MFC after:	3 days
2007-01-16 15:55:29 +00:00
Randall Stewart
44b7479ba2 - Macroizes the V6ONLY flag check.
- Added a short time wait (not used yet) constant
- Corrected the type of the crc32c table (it was
  unsigned long and really is a uint32_t
- Got rid of the user of MHeaders until they
  are truely needed by lower layers.
- Fixed an initialization problem in the readq structure
  (ordering was off).
- Found yet another collision bug when the random number
  generator returns two numbers on one side (during a collision)
  that are the same. Also added some tracking of cookies
  that will go away when we know that we have the last collision
  bug gone.
- Fixed an init bug for book_size_scale, that was causing
  Early FR code to run when it should not.
- Fixed a flight size tracking bug that was associated with
  Early FR but due to above bug also effected all FR's
- Fixed it so Max Burst also will apply to Fast Retransmit.
- Fixed a bug in the temporary logging code that allowed a
  static log array overflow
- hashinit_flags is now used.
- Two last mcopym's were converted to the macro sctp_m_copym that
  has always been used by all other places
- macro sctp_m_copym was converted to upper case.
- We now validate sinfo_flags on input (we did not before).
- Fixed a bug that prevented a user from sending data and immediately
  shuting down with one send operation.
- Moved to use hashdestroy instead of free() in our macros.
- Fixed an init problem in our timed_wait vtag where we
  did not fully initialize our time-wait blocks.
- Timer stops were re-positioned.
- A pcb cleanup method was added, however this probably will
  not be used in BSD.. unless we make module loadable protocols
- I think this fixes the mysterious timer bug.. it was a
  ordering of locks problem in the way we did timers. It
  now conforms to the timeout(9) manual (except for the
  _drain part, we had to do this a different way due
  to locks).
- Fixed error return code so we get either CONNREUSED or CONNRESET
  depending on where one is in progression
- Purged an unused clone macro.
- Fixed a read erro code issue where we were NOT getting the proper
  error when the connection was reset.
- Purged an unused clone macro.
- Fixed a read erro code issue where we were NOT getting the proper
  error when the connection was reset.
Approved by:	gnn
2007-01-15 15:12:10 +00:00
Warner Losh
1c0ee39e74 Marked these as packed correctly 2007-01-12 07:20:25 +00:00
Randall Stewart
139bc87fda a) macro-ization of all mbuf and random number
access plus timers. This makes the code
   more portable and able to change out the
   mbuf or timer system used more easily ;-)
b) removal of all use of pkt-hdr's until only
   the places we need them (before ip_output routines).
c) remove a bunch of code not needed due to <b> aka
   worrying about pkthdr's :-)
d) There was one last reorder problem it looks where
   if a restart occur's and we release and relock (at
   the point where we setup our alias vtag) we would
   end up possibly getting the wrong TSN in place. The
   code that fixed the TSN's just needed to be shifted
   around BEFORE the release of the lock.. also code that
   set the state (since this also could contribute).
Approved by:	gnn
2006-12-29 20:21:42 +00:00
Bjoern A. Zeeb
e521ae0c64 In ip6_sprintf print the addresses in a more common/readable
format eliminating leading zeros like in :0001 -> :1.

Reviewed by:	mlaier
2006-12-16 14:15:31 +00:00
Randall Stewart
a5d547add3 1) Fixes on a number of different collision case LOR's.
2) Fix all "magic numbers" to be constants.
3) A collision case that would generate two associations to
   the same peer due to a missing lock is fixed.
4) Added tracking of where timers are stopped.
Approved by:	gnn
2006-12-14 17:02:55 +00:00
Bjoern A. Zeeb
1d54aa3ba9 MFp4: 92972, 98913 + one more change
In ip6_sprintf no longer use and return one of eight static buffers
for printing/logging ipv6 addresses.
The caller now has to hand in a sufficiently large buffer as first
argument.
2006-12-12 12:17:58 +00:00
Ruslan Ermilov
f9a047a1b7 - In nd6_rtrequest(), when caching an rtentry, don't forget
to add a reference to it; otherwise, we could later access
  a freed memory.  This is believed to fix panics some users
  were observing when running route6d(8), and is similar to
  the fix in sys/netinet/if_ether.c,v 1.139 by glebius@.

PR:		kern/93910, kern/105437
Testing by:	Wojciech Puchar (still ongoing)

- Add rtentry locking to nd6_output() similar to rt_check().

MFC after:	4 days
2006-11-25 20:38:56 +00:00
Randall Stewart
03b0b02163 -Fixes first of all the getcred on IPv6 and V4. The
copy's were incorrect and so was the locking.
-A bug was also found that would create a race and
 panic when an abort arrived on a socket being read
 from.
-Also fix the reader to get MSG_TRUNC when a partial
 delivery is aborted.
-Also addresses a couple of coverity caught error path
 memory leaks and a couple of other valid complaints
Approved by:	gnn
2006-11-08 00:21:13 +00:00
Robert Watson
b96fbb37da Convert three new suser(9) calls introduced between when the priv(9)
patch was prepared and committed to priv(9) calls.  Add XXX comments
as, in each case, the semantics appear to differ from the TCP/UDP
versions of the calls with respect to jail, and because cr_canseecred()
is not used to validate the query.

Obtained from:	TrustedBSD Project
2006-11-06 14:54:06 +00:00
Robert Watson
acd3428b7d Sweep kernel replacing suser(9) calls with priv(9) calls, assigning
specific privilege names to a broad range of privileges.  These may
require some future tweaking.

Sponsored by:           nCircle Network Security, Inc.
Obtained from:          TrustedBSD Project
Discussed on:           arch@
Reviewed (at least in part) by: mlaier, jmg, pjd, bde, ceri,
                        Alex Lyashkov <umka at sevcity dot net>,
                        Skip Ford <skip dot ford at verizon dot net>,
                        Antoine Brodin <antoine dot brodin at laposte dot net>
2006-11-06 13:42:10 +00:00
Randall Stewart
50cec91936 Tons of fixes to get all the 64bit issues removed.
This also moves two 16 bit int's to become 32 bit
values so we do not have to use atomic_add_16.
Most of the changes are %p, casts and other various
nasty's that were in the orignal code base. With this
commit my machine will now do a build universe.. however
I as yet have not tested on a 64bit machine .. it may not work :-(
2006-11-05 13:25:18 +00:00
Randall Stewart
73932c69b6 Opps... in my fix up of all the $FreeBSD:$-> $FreeBSD$ I
inserted a few to the new files.. but I falied to
add the #include <sys/cdef.h>

Which causes a compile error.. sorry about that... got it
now :-)

Approved by:gnn
2006-11-03 17:21:53 +00:00
Randall Stewart
f8829a4a40 Ok, here it is, we finally add SCTP to current. Note that this
work is not just mine, but it is also the works of Peter Lei
and Michael Tuexen. They both are my two key other developers
working on the project.. and they need ata-boy's too:
****
peterlei@cisco.com
tuexen@fh-muenster.de
****
I did do a make sysent which updated the
syscall's and sysproto.. I hope that is correct... without
it you don't build since we have new syscalls for SCTP :-0

So go out and look at the NOTES, add
option SCTP (make sure inet and inet6 are present too)
and play with SCTP.

I will see about comitting some test tools I have after I
figure out where I should place them. I also have a
lib (libsctp.a) that adds some of the missing socketapi
functions that I need to put into lib's.. I will talk
to George about this :-)

There may still be some 64 bit issues in here, none of
us have a 64 bit processor to test with yet.. Michael
may have a MAC but thats another beast too..

If you have a mac and want to use SCTP contact Michael
he maintains a web site with a loadable module with
this code :-)

Reviewed by:	gnn
Approved by:	gnn
2006-11-03 15:23:16 +00:00
Robert Watson
aed5570872 Complete break-out of sys/sys/mac.h into sys/security/mac/mac_framework.h
begun with a repo-copy of mac.h to mac_framework.h.  sys/mac.h now
contains the userspace and user<->kernel API and definitions, with all
in-kernel interfaces moved to mac_framework.h, which is now included
across most of the kernel instead.

This change is the first step in a larger cleanup and sweep of MAC
Framework interfaces in the kernel, and will not be MFC'd.

Obtained from:	TrustedBSD Project
Sponsored by:	SPARTA
2006-10-22 11:52:19 +00:00
Hajimu UMEMOTO
e7e51bc3e1 Make net.inet6.ip6.auto_linklocal tunable. Someone may want to
enable/disable auto_linklocal even in single user mode.

Discussed with:	re@, gnn@
MFC after:	3 days
2006-10-13 12:45:53 +00:00
Hajimu UMEMOTO
f5c04409eb Revert the default value of net.inet6.ip6.auto_linklocal to 1.
If ipv6_enable is not set to "YES", net.inet6.ip6.auto_linklocal
is turned to 0 at boot.

Discussed with:	re@, gnn@
MFC after:	3 days
2006-10-13 12:41:36 +00:00
John Hay
ae0ddac700 Hopefully the last tweak in trying to make it possible to add ipv6 direct
host routes without side effects.

Submitted by:	JINMEI Tatuya
MFC after:	4 days
2006-10-02 19:15:10 +00:00
George V. Neville-Neil
90ce6fa1c8 Turn off automatic link local address if ipv6_enable is not set to YES
in rc.conf

Reviewed by:    KAME core team, cperciva
MFC after:      3 days
2006-10-02 10:13:30 +00:00
John Hay
584b68e792 A better fix is to check if it is a host route.
Submitted by:	ume
MFC after:	5 days
2006-09-30 20:25:33 +00:00
John Hay
c482f11edb My previous commit broke "route add -inet6 <network_addr> -interface gif0".
Fix that by excluding point-to-point interfaces.

MFC after:	5 days
2006-09-30 14:08:57 +00:00
Bruce M Simpson
910e1364b6 Nits.
Submitted by:	ru
2006-09-29 16:16:41 +00:00
Bruce M Simpson
2d20d32344 Push removal of mrouted down to the rest of the tree. 2006-09-29 15:45:11 +00:00
SUZUKI Shinsuke
831c32014e fixed a bug that IPv6 packets arriving to stf are not accepted.
(a degrade introduced in in6.c Rev 1.61)

PR: kern/103415
Submitted by: JINMEI Tatuya
MFC after: 1 week
2006-09-22 01:42:22 +00:00
John Hay
f129892448 Make it possible to add an IPv6 host route to a host directly connected.
Use something like this:
route add -inet6 <dest_addr> <my_addr_on_that_interface> -interface -llinfo

This is usefull for wireless adhoc mesh networks.

MFC after:	5 days
2006-09-16 06:24:28 +00:00
John Hay
1fcae350ae All multicast listeners on a port should get one copy of the packet. This
was broken during the locking changes.
2006-09-07 18:44:54 +00:00
Andre Oppermann
233dcce118 First step of TSO (TCP segmentation offload) support in our network stack.
o add IFCAP_TSO[46] for drivers to announce this capability for IPv4 and IPv6
 o add CSUM_TSO flag to mbuf pkthdr csum_flags field
 o add tso_segsz field to mbuf pkthdr
 o enhance ip_output() packet length check to allow for large TSO packets
 o extend tcp_maxmtu[46]() with a flag pointer to pass interface capabilities
 o adjust all callers of tcp_maxmtu[46]() accordingly

Discussed on:	-current, -net
Sponsored by:	TCP/IP Optimization Fundraise 2005
2006-09-06 21:51:59 +00:00
John Hay
80a684e083 Use net.inet6.ip6.redirect / ip6_sendredirects as part of the decision
to generate icmp6 redirects. Now it is possible to switch redirects off.

MFC after:	1 week
2006-09-05 19:20:42 +00:00
Brooks Davis
43bc7a9c62 With exception of the if_name() macro, all definitions in net_osdep.h
were unused or already in if_var.h so add if_name() to if_var.h and
remove net_osdep.h along with all references to it.

Longer term we may want to kill off if_name() entierly since all modern
BSDs have if_xname variables rendering it unnecessicary.
2006-08-04 21:27:40 +00:00
Robert Watson
c9db0fad09 Align IPv6 socket locking with IPv4 locking: lock socket buffer explicitly
and use _locked variants to avoid extra lock and unlock operations.

Reviewed by:	gnn
MFC after:	1 week
2006-07-23 12:24:22 +00:00
George V. Neville-Neil
c6af35ee0e The KAME project ceased work on IPv6 and IPSec in March of 2006.
Remove the README file which warns against cosmetic or local only
changes.  FreeBSD committers should now feel free to work on the
IPv6 and IPSec code without fetters.  The KAME mailing lists still
exist and it is always a good idea to ask questions about this code
on the snap-users@kame.net mailing list.

Reviewed by:	rwatson, brooks
2006-07-22 02:32:32 +00:00
Robert Watson
a152f8a361 Change semantics of socket close and detach. Add a new protocol switch
function, pru_close, to notify protocols that the file descriptor or
other consumer of a socket is closing the socket.  pru_abort is now a
notification of close also, and no longer detaches.  pru_detach is no
longer used to notify of close, and will be called during socket
tear-down by sofree() when all references to a socket evaporate after
an earlier call to abort or close the socket.  This means detach is now
an unconditional teardown of a socket, whereas previously sockets could
persist after detach of the protocol retained a reference.

This faciliates sharing mutexes between layers of the network stack as
the mutex is required during the checking and removal of references at
the head of sofree().  With this change, pru_detach can now assume that
the mutex will no longer be required by the socket layer after
completion, whereas before this was not necessarily true.

Reviewed by:	gnn
2006-07-21 17:11:15 +00:00