Add MSG_EOF and MSG_EOR suppor for sendmsg() on FreeBSD.

This does not affect the userland stack.
diff --git a/usrsctplib/netinet/sctp_output.c b/usrsctplib/netinet/sctp_output.c
index af66c4e..713a304 100755
--- a/usrsctplib/netinet/sctp_output.c
+++ b/usrsctplib/netinet/sctp_output.c
@@ -34,7 +34,7 @@
 
 #ifdef __FreeBSD__
 #include <sys/cdefs.h>
-__FBSDID("$FreeBSD: head/sys/netinet/sctp_output.c 349986 2019-07-14 12:04:39Z tuexen $");
+__FBSDID("$FreeBSD: head/sys/netinet/sctp_output.c 349999 2019-07-15 14:54:04Z tuexen $");
 #endif
 
 #include <netinet/sctp_os.h>
@@ -13685,6 +13685,14 @@
 		sinfo_flags = inp->def_send.sinfo_flags;
 		sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
 	}
+#if defined(__FreeBSD__)
+	if (flags & MSG_EOR) {
+		sinfo_flags |= SCTP_EOR;
+	}
+	if (flags & MSG_EOF) {
+		sinfo_flags |= SCTP_EOF;
+	}
+#endif
 	if (sinfo_flags & SCTP_SENDALL) {
 		/* its a sendall */
 		error = sctp_sendall(inp, uio, top, srcv);
@@ -13850,9 +13858,19 @@
 		}
 	} else
 		asoc = &stcb->asoc;
-	if (srcv == NULL)
+	if (srcv == NULL) {
 		srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
-	if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
+		sinfo_flags = srcv->sinfo_flags;
+#if defined(__FreeBSD__)
+		if (flags & MSG_EOR) {
+			sinfo_flags |= SCTP_EOR;
+		}
+		if (flags & MSG_EOF) {
+			sinfo_flags |= SCTP_EOF;
+		}
+	}
+#endif
+	if (sinfo_flags & SCTP_ADDR_OVER) {
 		if (addr)
 			net = sctp_findnet(stcb, addr);
 		else
@@ -13966,7 +13984,7 @@
 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
 	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
 	    (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
-		if (srcv->sinfo_flags & SCTP_ABORT) {
+		if (sinfo_flags & SCTP_ABORT) {
 			;
 		} else {
 			SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
@@ -13987,7 +14005,7 @@
 	}
 #endif
 	/* Are we aborting? */
-	if (srcv->sinfo_flags & SCTP_ABORT) {
+	if (sinfo_flags & SCTP_ABORT) {
 		struct mbuf *mm;
 		ssize_t tot_demand, tot_out = 0, max_out;
 
@@ -14202,7 +14220,7 @@
 	 * NOTE: uio will be null when top/mbuf is passed
 	 */
 	if (sndlen == 0) {
-		if (srcv->sinfo_flags & SCTP_EOF) {
+		if (sinfo_flags & SCTP_EOF) {
 			got_all_of_the_send = 1;
 			goto dataless_eof;
 		} else {
@@ -14250,7 +14268,7 @@
 			}
 			sctp_snd_sb_alloc(stcb, sp->length);
 			atomic_add_int(&asoc->stream_queue_cnt, 1);
-			if (srcv->sinfo_flags & SCTP_UNORDERED) {
+			if (sinfo_flags & SCTP_UNORDERED) {
 				SCTP_STAT_INCR(sctps_sends_with_unord);
 			}
 			TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
@@ -14350,7 +14368,7 @@
 				sctp_snd_sb_alloc(stcb, sndout);
 				atomic_add_int(&sp->length, sndout);
 				len += sndout;
-				if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
+				if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
 					sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
 				}
 
@@ -14365,8 +14383,8 @@
 				if ((uio->uio_resid == 0) &&
 #endif
 				    ((user_marks_eor == 0) ||
-				     (srcv->sinfo_flags & SCTP_EOF) ||
-				     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
+				     (sinfo_flags & SCTP_EOF) ||
+				     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
 					sp->msg_is_complete = 1;
 				} else {
 					sp->msg_is_complete = 0;
@@ -14599,7 +14617,7 @@
 		/* We send in a 0, since we do NOT have any locks */
 		error = sctp_msg_append(stcb, net, top, srcv, 0);
 		top = NULL;
-		if (srcv->sinfo_flags & SCTP_EOF) {
+		if (sinfo_flags & SCTP_EOF) {
 			/*
 			 * This should only happen for Panda for the mbuf
 			 * send case, which does NOT yet support EEOR mode.
@@ -14614,7 +14632,7 @@
 	}
 dataless_eof:
 	/* EOF thing ? */
-	if ((srcv->sinfo_flags & SCTP_EOF) &&
+	if ((sinfo_flags & SCTP_EOF) &&
 	    (got_all_of_the_send == 1)) {
 		SCTP_STAT_INCR(sctps_sends_with_eof);
 		error = 0;