added watt32 headers and brought the DOS version up to parity with UNIX

[oftp] / libs / watt32 / netinet / tcp_scor.h

diff --git a/libs/watt32/netinet/tcp_scor.h b/libs/watt32/netinet/tcp_scor.h
new file mode 100644 (file)
index 0000000..4689efc
--- /dev/null
+++ b/libs/watt32/netinet/tcp_scor.h
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+/*!\file netinet/tcp_scor.h
+ * TCP scoreboard definitions (SACK).
+ */
+
+/*
+ * Copyright (c) 1997, Pittsburgh Supercomputing Center, 
+ * Jamshid Mahdavi, Matt Mathis, Jeffrey Semke
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose and without fee is hereby granted, 
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.
+ *
+ * This is experimental software under active development and may
+ * potentially contain bugs.   Use at your own risk.
+ *
+ */
+
+#ifndef __NETINET_TCP_SCOREBOARD_H
+#define __NETINET_TCP_SCOREBOARD_H
+
+/**********************************************************************
+ *
+ *  Scoreboard module headers: 
+ *
+ **********************************************************************/
+
+/* Initialize the scoreboard
+ */
+#define scrb_init(tp) { LIST_INIT(&((tp)->scrb.head));     \
+                        (tp)->scrb.last_ack=(tp)->snd_una; \
+                        (tp)->snd_retran_data = 0; }
+
+/*  
+ *  Check to see if the scoreboard is empty
+ *  scrb_isempty(struct tcpcp *tp)
+ */
+#define scrb_isempty(tp)     (! ((tp)->scrb.scrb_head))
+
+/* This macro quickly takes care of the common case of an empty
+ *  scoreboard. Otherwise it called scrb_getnextretran_func to hunt
+ *  through the scoreboard and return the next block of data to be
+ *  retransmitted.  The start and end of the block are filled in to
+ *  start_ptr and end_ptr, and the length of the block is returned.  A
+ *  zero return value indicates that there is no data to be
+ *  retransmitted at this time.  Note that end_ptr actually points to
+ *  the first byte of data which is NOT to be retransmitted (or the
+ *  first byte following the data to be retransmitted) similar in
+ *  fashion to the rest of this code.
+ *
+ *  scrb_getnextretran(struct tcpcp *tp, tcp_seq *start, tcp_seq *end) 
+ */
+
+#define scrb_getnextretran(tp,start,end)   \
+           (scrb_isempty(tp) ? \
+             (int)((tcp_seq*)*start = (tcp_seq*)*end = \
+             (tcp_seq*)0) \
+           : scrb_getnextretran_func(tp,start,end))
+                             
+
+/* sender side -- tracks packets sent that WERE selectively acknowledged
+ * by the other end.
+ * Each sb_entry represents a hole (missing data) followed by
+ * consecutive received data.
+ */
+struct scrb_entry {
+      LIST_ENTRY(scrb_entry) ptrs;    /*  Next/Prev structure pointers */
+      tcp_seq start;                  /*  Start of received data block */
+      tcp_seq end;                    /*  End of received data block      */
+      tcp_seq retran;                 /*  End of subsequent data 
+                                            retransmitted  */
+      tcp_seq snd_max;                /*  Value of snd_max at the time of 
+                                            retransmission */
+      int     sack_cnt;               /*  FACK ONLY:  Number of reports for 
+                                          this hole */
+};
+
+#define scrb_next ptrs.le_next       /* next element */
+#define scrb_prev ptrs.le_prev       /* previous element */
+
+
+/* sender side -- tracks packets sent that were selectively
+ * acknowledged by the other end
+ */
+struct scoreboard {
+      tcp_seq last_ack;               /* This value replicates snd_una, 
+                                         but is needed for internal 
+                                         scoreboard state.  */
+      LIST_HEAD(scrb_head_internal, scrb_entry) head; /* Scoreboard list */
+};
+
+#define scrb_head head.lh_first       /* first element of scoreboard */
+
+/* return codes from routines that might have to clear the scoreboard
+ */
+#define E_SCRB_CLEAR          -1
+#define E_SCRB_NOERR           0
+
+/* reason parameters for scrb_clear
+ */
+#define SCRB_INIT              0
+#define SCRB_RENEGE            1
+#define SCRB_NOMEM             2
+#define SCRB_TIMEOUT           3
+
+#endif /* __NETINET_TCP_SCOREBOARD_H */