Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r260257:

Fix several bugs in sctp_bindx():
* Set errno to EAFNOSUPPORT if an address is provided which is neither
AF_INET nor AF_INET6.
* Don't modify the arguments.
* Don't smash the stack when provided with a non-zero port.
* Handle the case correctly where the first address provided is
an IPv6 address.

MFC r255695:

Remove an unused variable and fix a memory leak in sctp_connectx().

MFC r253104:
Fix a bug where SCTP_ENABLE_STREAM_RESET is not handled by
sctp_opt_info().

MFC r253105:
Fix the handling of SCTP_CURRENT_ASSOC and SCTP_ALL_ASSOC in
sctp_opt_info().

Approved by: re@

MFC r249333:
Remove the number of addresses restriction from sctp_connectx().
Remove unused code.
While there, do some cleanup of the code.

MFC r246629:
Improve code style. No functional change.

MFC r243302:
Cleanup the code a bit, which improves the portability.

MFC r243300:
Fix the handling of mapped IPv6 addresses in sctp_connectx().

MFC r242512:
Fix errno in a couple of error cases.

MFC r235827:
Update copyright date.

MFC r234997:
Remove debug output.

MFC r227755:
Add support for the SCTP_REMOTE_UDP_ENCAPS_PORT socket option.
Retire the the now unused sctp_udp_tunneling_for_client_enable
sysctl variable.

MFC r228630:
Address warnings found by clang.

MFC 228531:
Fix a bug where sctp_sendmdg() uses uninitialized memory.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

The result of a joint work between rrs@ and myself at the IETF:
* Decouple the path supervision using a separate HB timer per path.
* Add support for potentially failed state.
* Bring back RTO.min to 1 second.
* Accept packets on IP-addresses already announced via an ASCONF
* While there: do some cleanups.

Approved by: re@
MFC after: 2 months.

Add SCTP_MAX_BURST support to sctp_opt_info().
This only applies to 9.0 and higher, since the type
of the values has changed since we introduced it.
So it can't be MFCed.

Update the list of supported socket options for sctp_opt_info().

MFC after: 1 month.

Fix two typos and remove redundant code.

MFC after: 1 month.

* Fix the handling of addresses in sctp_sendv().
* Add support for SCTP_SENDV_NOINFO.
* Improve the error handling of sctp_sendv() and sctp_recv().

MFC after: 1 month

Add support for the newly added SCTP API.
In particular add support for:
* SCTP_SNDINFO, SCTP_PRINFO, SCTP_AUTHINFO, SCTP_DSTADDRV4, and
SCTP_DSTADDRV6 cmsgs.
* SCTP_NXTINFO and SCTP_RCVINFO cmgs.
* SCTP_EVENT, SCTP_RECVRCVINFO, SCTP_RECVNXTINFO and SCTP_DEFAULT_SNDINFO
socket option.
* Special association ids (SCTP_FUTURE_ASSOC, ...)
* sctp_recvv() and sctp_sendv() functions.

MFC after: 1 month.

* Update copyright notice.
* Cleanup usage of iov's.
* Add support for SCTP_TIMEOUTS socketoption.
* Fix a bug in sctp_recvmsg(): return the msg_flags in case of an error.
* Fix a bug in the error handling of sctp_peeloff(): return the -1.

If a user calls sctp_sendx() with a NULL
sinfo we will crash. Instead we should provide
our own temp structure to use internally.

MFC after: 1 month

Increment 'sa' at the end of the loop; otherwise, only the first
address ever gets checked.

Approved by: rrs (mentor)
MFC after: 1 month

Use ISO C99 integer types instead of the BSD-specific u_int*_t.

Approved by: rrs (mentor)

Remove extra semicolon.

Approved by: rrs (mentor)

- take out a needless panic under invariants for sctp_output.c
- Fix addrs's error checking of sctp_sendx(3) when addrcnt is less than
SCTP_SMALL_IOVEC_SIZE
- re-add back inpcb_bind local address check bypass capability
- Fix it so sctp_opt_info is independant of assoc_id postion.
- Fix cookie life set to use MSEC_TO_TICKS() macro.
- asconf changes
o More comment changes/clarifications related to the old local address
"not" list which is now an explicit restricted list.

o Rename some functions for clarity:
- sctp_add/del_local_addr_assoc to xxx_local_addr_restricted()
- asconf related iterator functions to sctp_asconf_iterator_xxx()

o Fix bug when the same address is deleted and added (and removed from
the asconf queue) where the ifa is "freed" twice refcount wise,
possibly freeing it completely.

o Fix bug in output where the first ASCONF would not go out after the
last address is changed (e.g. only goes out when retransmitted).

o Fix bug where multiple ASCONFs can be bundled in the same packet with
the and with the same serial numbers.

o Fix asconf stcb iterator to not send ASCONF until after all work
queue entries have been processed.

o Change behavior so that when the last address is deleted (auto asconf
on a bound all endpoint) no action is taken until an address is
added; at that time, an ASCONF add+delete is sent (if the assoc
is still up).

o Fix local address counting so that address scoping is taken into
account.

o #ifdef SCTP_TIMER_BASED_ASCONF the old timer triggered sending
of ASCONF (after an RTO). The default now is to send
ASCONF immediately (except for the case of changing/deleting the
last usable address).
Approved by: re(ken smith)@freebsd.org

- Modular congestion control, with RFC2581 being the default.
- CMT_PF states added (w/sysctl to turn the PF version on)
- sctp_input.c had a missing incr of cookie case when the
auth was bad. This meant a free was called without an
increment to refcnt, added increment like rest of code.
- There was a case, unlikely, when the scope of the destination
changed (this is a TSNH case). In that case, it would not free
the alloc'ed asoc (in sctp_input.c).
- When listed addresses found a colliding cookie/Init, then
the collided upon tcb was not unlocked in sctp_pcb.c
- Add error checking on arguments of sctp_sendx(3) to prevent it from
referencing a NULL pointer.
- Fix an error return of sctp_sendx(3), it was returing
ENOMEM not -1.
- Get assoc id was changed to use the sanctified socket api
method for getting a assoc id (PEER_ADDR_INFO instead of
PEER_ADDR_PARAMS).
- Fix it so a peeled off socket will get a proper error return
if it trys to send to a different address then it is connected to.
- Fix so that select_a_stream can avoid an endless loop that
could hang a caller.
- time_entered (state set time) was not being set in all cases
to the time we went established.
Approved by: re(ken smith)

- Removes some incorrect error returns (errno was being overriden in
one of the functions)
- Fixes the error return of sctp_get_opt, it was returning the errno not
-1.
Approved by: re@freebsd.org (Robert Watson)
Obtained from: Weongyo Jeong (weongyo.jeong@gmail.com)

Add missing semi-colon.

Approved by: re (not really, but it's better to have things compile than not for right now. Sorry)

- Fix wrong error return (the errno was being returned and not placed
in errno) - Found by Weongyo Jeong
- Remove two extra un-needed memset() after calloc()'s - Found by
Weongyo Jeong
- Tightened up parameter requirement checking on input to
bindx/connectx per socket api spec.
Approved by: re@freebsd.org(Ken Smith)

- Fix incorrect error return on sctp_getaddrlen
- Fix a memory leak when a non v4/v6 address was passed in.
- Take out strange line that copy's back to the src array
incorrectly (corrupting the input array).

Approved by: re(bmah@freebsd.org)
Obtained from: Weongyo Jeong(weongyo.jeong@gmail.com)

- Validate incoming addresses and sizes for connectx and bindx.
- For non-sys call version pass the msg_flags.

-Fix so getoptinfo() is in conformance with socket api (it
can be used on any read socketopt).
-Clean up of sendmsg call and make it conformant when no syscall
is available.

- 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

Fixes build breakage.. invalid type casts.. and invalid
type for size in one place.

Fixes __FreeBSD__ being present (they should not)
and also trailing garbage on undef of magic numbers.

Adds a performance improvement for when sctp_sendx is
called with only one address, we then can call the
generic system call. Also fixes some socket api
type issues and cleans up the "magic" numbers that
were being used in the code.

Reviewed by: gnn

Consistently use a socklen_t type where required, and eliminate
GCC warning "dereferencing type-punned pointer will
break strict-aliasing rules".

Reviewed by: rrs

This adds the "system calls"
sctp_getaddrlen()
sctp_connectx()
sctp_bindx()
sctp_opt_info()
sctp_getpaddrs()
sctp_freepaddrs()
sctp_getladdrs()
sctp_freeladdrs()
sctp_sendmsg()
sctp_getassocid()
sctp_send()
sctp_sendx()
sctp_sendmsgx()
sctp_recvmsg()
sctp_peeloff()

Manual pages will be forthcoming (and the commit to porters-handbook)