Merge branch 'sctp-rcv-side-stream-reconf-ssn-reset-req-chunk'

Xin Long says:

====================
sctp: add receiver-side procedures for stream reconf ssn reset request chunk

Patch 3/7 and 4/7 are to implement receiver-side procedures for the
Outgoing and Incoming SSN Reset Request Parameter described in rfc6525
section 5.2.2 and 5.2.3

Patch 1/7 and 2/7 are ahead of them to define some apis.

Patch 5/7-7/7 are to add the process of reconf chunk event in rx path.

Note that with this patchset, asoc->reconf_enable has no chance yet to
be set, until the patch "sctp: add get and set sockopt for reconf_enable"
is applied in the future. As we can not just enable it when sctp is not
capable of processing reconf chunk yet.

v1->v2:
  - re-split the patchset and make sure it has no dead codes for review.
  - rename the titles of the commits and improve some changelogs.
  - drop __packed from some structures in patch 1/7.
  - fix some kbuild warnings in patch 3/7 by initializing str_p = NULL.
  - sctp_chunk_lookup_strreset_param changes to return sctp_paramhdr_t *
    and uses sctp_strreset_tsnreq to access request_seq in patch 3/7.
  - use __u<size> in uapi sctp.h in patch 1/7.
  - do str_list endian conversion when generating stream_reset_event in patch
    2/7.
  - remove str_list endian conversion, pass resp_seq param with network endian
    to lookup_strreset_param in 3/7.
  - move str_list endian conversion out of sctp_make_strreset_req, so that
    sctp_make_strreset_req can be used more conveniently to process inreq in
    patch 4/7.
  - remove sctp_merge_reconf_chunk and not support response with multiparam
    in patch 6/7.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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