[SCTP] Removed the deprecated ADLER32 checksum support.

net/sctp/Kconfig

@@ -37,19 +37,6 @@ config IP_SCTP
 
 	  If in doubt, say N.
 
-config SCTP_ADLER32
-	bool "SCTP: Use old checksum (Adler-32)"
-	depends on IP_SCTP
-	help
-	  RFC2960 currently specifies the Adler-32 checksum algorithm for SCTP.
-	  This has been deprecated and replaced by an algorithm now referred
-	  to as crc32c.
-
-	  If you say Y, this will use the Adler-32 algorithm, this might be 
-	  useful for interoperation with downlevel peers. 
-
-	  If unsure, say N.  
-
 config SCTP_DBG_MSG
 	bool "SCTP: Debug messages"
 	depends on IP_SCTP

net/sctp/Makefile

@@ -9,13 +9,7 @@ sctp-y := sm_statetable.o sm_statefuns.o sm_sideeffect.o \
 	  transport.o chunk.o sm_make_chunk.o ulpevent.o \
 	  inqueue.o outqueue.o ulpqueue.o command.o \
 	  tsnmap.o bind_addr.o socket.o primitive.o \
-	  output.o input.o debug.o ssnmap.o proc.o
-
-ifeq ($(CONFIG_SCTP_ADLER32), y)
-sctp-y += adler32.o
-else
-sctp-y += crc32c.o
-endif
+	  output.o input.o debug.o ssnmap.o proc.o crc32c.o
 
 sctp-$(CONFIG_SCTP_DBG_OBJCNT) += objcnt.o
 sctp-$(CONFIG_SYSCTL) += sysctl.o

net/sctp/adler32.c

-/* SCTP kernel reference Implementation
- * Copyright (c) 1999-2000 Cisco, Inc.
- * Copyright (c) 1999-2001 Motorola, Inc.
- * Copyright (c) 2003 International Business Machines, Corp.
- *
- * This file is part of the SCTP kernel reference Implementation
- *
- * This file has direct heritage from the SCTP user-level reference
- * implementation by R. Stewart, et al.  These functions implement the
- * Adler-32 algorithm as specified by RFC 2960.
- *
- * The SCTP reference implementation is free software;
- * you can redistribute it and/or modify it under the terms of
- * the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * The SCTP reference implementation is distributed in the hope that it
- * will be useful, but WITHOUT ANY WARRANTY; without even the implied
- *                 ************************
- * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GNU CC; see the file COPYING.  If not, write to
- * the Free Software Foundation, 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- *
- * Please send any bug reports or fixes you make to the
- * email address(es):
- *    lksctp developers <lksctp-developers@lists.sourceforge.net>
- *
- * Or submit a bug report through the following website:
- *    http://www.sf.net/projects/lksctp
- *
- * Written or modified by:
- *    Randall Stewart <rstewar1@email.mot.com>
- *    Ken Morneau     <kmorneau@cisco.com>
- *    Qiaobing Xie    <qxie1@email.mot.com>
- *    Sridhar Samudrala <sri@us.ibm.com>
- *
- * Any bugs reported given to us we will try to fix... any fixes shared will
- * be incorporated into the next SCTP release.
- */
-
-/* This is an entry point for external calls
- * Define this function in the header file. This is
- * direct from rfc1950, ...
- *
- * The following C code computes the Adler-32 checksum of a data buffer.
- * It is written for clarity, not for speed.  The sample code is in the
- * ANSI C programming language. Non C users may find it easier to read
- * with these hints:
- *
- *    &      Bitwise AND operator.
- *    >>     Bitwise right shift operator. When applied to an
- *           unsigned quantity, as here, right shift inserts zero bit(s)
- *           at the left.
- *    <<     Bitwise left shift operator. Left shift inserts zero
- *           bit(s) at the right.
- *    ++     "n++" increments the variable n.
- *    %      modulo operator: a % b is the remainder of a divided by b.
- *
- * Well, the above is a bit of a lie, I have optimized this a small
- * tad, but I have commented the original lines below
- */
-
-#include <linux/types.h>
-#include <net/sctp/sctp.h>
-
-#define BASE 65521 /* largest prime smaller than 65536 */
-
-
-/* Performance work as shown this pig to be the
- * worst CPU wise guy. I have done what I could think
- * of on my flight to Australia but I am sure some
- * clever assembly could speed this up, but of
- * course this would require the dreaded #ifdef's for
- * architecture. If you can speed this up more, pass
- * it back and we will incorporate it :-)
- */
-
-unsigned long update_adler32(unsigned long adler,
-			     unsigned char *buf, int len)
-{
-	__u32 s1 = adler & 0xffff;
-	__u32 s2 = (adler >> 16) & 0xffff;
-        int n;
-
-	for (n = 0; n < len; n++,buf++) {
-		/* s1 = (s1 + buf[n]) % BASE */
-		/* first we add */
-		s1 = (s1 + *buf);
-
-		/* Now if we need to, we do a mod by
-		 * subtracting. It seems a bit faster
-		 * since I really will only ever do
-		 * one subtract at the MOST, since buf[n]
-		 * is a max of 255.
-		 */
-		if (s1 >= BASE)
-			s1 -= BASE;
-
-		/* s2 = (s2 + s1) % BASE */
-		/* first we add */
-		s2 = (s2 + s1);
-
-		/* again, it is more efficient (it seems) to
-		 * subtract since the most s2 will ever be
-		 * is (BASE-1 + BASE-1) in the worse case.
-		 * This would then be (2 * BASE) - 2, which
-		 * will still only do one subtract. On Intel
-		 * this is much better to do this way and
-		 * avoid the divide. Have not -pg'd on
-		 * sparc.
-		 */
-		if (s2 >= BASE) {
-			/*      s2 %= BASE;*/
-			s2 -= BASE;
-		}
-	}
-
-	/* Return the adler32 of the bytes buf[0..len-1] */
-	return (s2 << 16) + s1;
-}
-
-__u32 sctp_start_cksum(__u8 *ptr, __u16 count)
-{
-	/*
-	 * Update a running Adler-32 checksum with the bytes
-	 * buf[0..len-1] and return the updated checksum. The Adler-32
-	 * checksum should be initialized to 1.
-	 */
-	__u32 adler = 1L;
-	__u32 zero = 0L;
-
-	/* Calculate the CRC up to the checksum field. */
-	adler = update_adler32(adler, ptr,
-			       sizeof(struct sctphdr) - sizeof(__u32));
-	/* Skip over the checksum field. */
-	adler = update_adler32(adler, (unsigned char *) &zero,
-			       sizeof(__u32));
-	ptr += sizeof(struct sctphdr);
-	count -= sizeof(struct sctphdr);
-
-	/* Calculate the rest of the Adler-32. */
-	adler = update_adler32(adler, ptr, count);
-
-        return adler;
-}
-
-__u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 adler)
-{
-	adler = update_adler32(adler, ptr, count);
-
-	return adler;
-}
-
-__u32 sctp_update_copy_cksum(__u8 *to, __u8 *from, __u16 count, __u32 adler)
-{
-	/* Its not worth it to try harder.  Adler32 is obsolescent. */
-	adler = update_adler32(adler, from, count);
-	memcpy(to, from, count);
-
-	return adler;
-}
-
-__u32 sctp_end_cksum(__u32 adler)
-{
-	return adler;
-}