xnu-344.tar.gz

[apple/xnu.git] / bsd / net / slcompress.c

diff --git a/bsd/net/slcompress.c b/bsd/net/slcompress.c
index 7875c4e9d6e6ed25b1b0953213dd0a319b9194b8..47108b410b6d7b81c33f9cafcc9b99bcd2f224c9 100644 (file)
--- a/bsd/net/slcompress.c
+++ b/bsd/net/slcompress.c
@@ -52,6 +52,7 @@
  * SUCH DAMAGE.
  *
  *     @(#)slcompress.c        8.2 (Berkeley) 4/16/94
+ * $FreeBSD: src/sys/net/slcompress.c,v 1.16 1999/12/29 04:38:37 peter Exp $
  */
 
 /*
@@ -167,6 +168,17 @@ sl_compress_init(comp, max_state)
        } \
 }
 
+/*
+ * Attempt to compress an outgoing TCP packet and return the type of
+ * the result.  The caller must have already verified that the protocol
+ * is TCP.  The first mbuf must contain the complete IP and TCP headers,
+ * and "ip" must be == mtod(m, struct ip *).  "comp" supplies the
+ * compression state, and "compress_cid" tells us whether it is OK
+ * to leave out the CID field when feasible.
+ *
+ * The caller is responsible for adjusting m->m_pkthdr.len upon return,
+ * if m is an M_PKTHDR mbuf.
+ */
 u_int
 sl_compress_tcp(m, ip, comp, compress_cid)
        struct mbuf *m;