FreeBSD/src 7de4780 (r345461)sys/netinet sctp_output.c sctp.h

Limit the size of messages sent on 1-to-many style SCTP sockets with the
SCTP_SENDALL flag. Allow also only one operation per SCTP endpoint.

This fixes an issue found by running syzkaller and is joint work with rrs@.

MFC after:              1 week
DeltaFile
+13-0sys/netinet/sctp_output.c
+2-0sys/netinet/sctp.h
+15-02 files

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