1 files changed, 192 insertions, 0 deletions
diff --git a/include/asm-i386/checksum.h b/include/asm-i386/checksum.h
new file mode 100644
index 000000000000..d76a5f081c91
--- /dev/null
+++ b/include/asm-i386/checksum.h
@@ -0,0 +1,192 @@
+#ifndef _I386_CHECKSUM_H
+#define _I386_CHECKSUM_H
+#include <linux/in6.h>
+/*
+ * computes the checksum of a memory block at buff, length len,
+ * and adds in "sum" (32-bit)
+ *
+ * returns a 32-bit number suitable for feeding into itself
+ * or csum_tcpudp_magic
+ *
+ * this function must be called with even lengths, except
+ * for the last fragment, which may be odd
+ *
+ * it's best to have buff aligned on a 32-bit boundary
+ */
+asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
+/*
+ * the same as csum_partial, but copies from src while it
+ * checksums, and handles user-space pointer exceptions correctly, when needed.
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+asmlinkage unsigned int csum_partial_copy_generic(const unsigned char *src, unsigned char *dst,
+                                                  int len, int sum, int *src_err_ptr, int *dst_err_ptr);
+/*
+ *      Note: when you get a NULL pointer exception here this means someone
+ *      passed in an incorrect kernel address to one of these functions.
+ *
+ *      If you use these functions directly please don't forget the
+ *      verify_area().
+ */
+static __inline__
+unsigned int csum_partial_copy_nocheck (const unsigned char *src, unsigned char *dst,
+                                        int len, int sum)
+{
+        return csum_partial_copy_generic ( src, dst, len, sum, NULL, NULL);
+}
+static __inline__
+unsigned int csum_partial_copy_from_user(const unsigned char __user *src, unsigned char *dst,
+                                                int len, int sum, int *err_ptr)
+{
+        might_sleep();
+        return csum_partial_copy_generic((__force unsigned char *)src, dst,
+                                        len, sum, err_ptr, NULL);
+}
+/*
+ *      This is a version of ip_compute_csum() optimized for IP headers,
+ *      which always checksum on 4 octet boundaries.
+ *
+ *      By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
+ *      Arnt Gulbrandsen.
+ */
+static inline unsigned short ip_fast_csum(unsigned char * iph,
+                                          unsigned int ihl)
+{
+        unsigned int sum;
+        __asm__ __volatile__(
+            "movl (%1), %0      ;\n"
+            "subl $4, %2        ;\n"
+            "jbe 2f             ;\n"
+            "addl 4(%1), %0     ;\n"
+            "adcl 8(%1), %0     ;\n"
+            "adcl 12(%1), %0    ;\n"
+"1:         adcl 16(%1), %0     ;\n"
+            "lea 4(%1), %1      ;\n"
+            "decl %2            ;\n"
+            "jne 1b             ;\n"
+            "adcl $0, %0        ;\n"
+            "movl %0, %2        ;\n"
+            "shrl $16, %0       ;\n"
+            "addw %w2, %w0      ;\n"
+            "adcl $0, %0        ;\n"
+            "notl %0            ;\n"
+"2:                             ;\n"
+        /* Since the input registers which are loaded with iph and ipl
+           are modified, we must also specify them as outputs, or gcc
+           will assume they contain their original values. */
+        : "=r" (sum), "=r" (iph), "=r" (ihl)
+        : "1" (iph), "2" (ihl)
+        : "memory");
+        return(sum);
+}
+/*
+ *      Fold a partial checksum
+ */
+static inline unsigned int csum_fold(unsigned int sum)
+{
+        __asm__(
+                "addl %1, %0            ;\n"
+                "adcl $0xffff, %0       ;\n"
+                : "=r" (sum)
+                : "r" (sum << 16), "0" (sum & 0xffff0000)
+        );
+        return (~sum) >> 16;
+}
+static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
+                                                   unsigned long daddr,
+                                                   unsigned short len,
+                                                   unsigned short proto,
+                                                   unsigned int sum)
+{
+    __asm__(
+        "addl %1, %0    ;\n"
+        "adcl %2, %0    ;\n"
+        "adcl %3, %0    ;\n"
+        "adcl $0, %0    ;\n"
+        : "=r" (sum)
+        : "g" (daddr), "g"(saddr), "g"((ntohs(len)<<16)+proto*256), "0"(sum));
+    return sum;
+}
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
+                                                   unsigned long daddr,
+                                                   unsigned short len,
+                                                   unsigned short proto,
+                                                   unsigned int sum)
+{
+        return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
+}
+/*
+ * this routine is used for miscellaneous IP-like checksums, mainly
+ * in icmp.c
+ */
+static inline unsigned short ip_compute_csum(unsigned char * buff, int len)
+{
+    return csum_fold (csum_partial(buff, len, 0));
+}
+#define _HAVE_ARCH_IPV6_CSUM
+static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
+                                                     struct in6_addr *daddr,
+                                                     __u32 len,
+                                                     unsigned short proto,
+                                                     unsigned int sum)
+{
+        __asm__(
+                "addl 0(%1), %0         ;\n"
+                "adcl 4(%1), %0         ;\n"
+                "adcl 8(%1), %0         ;\n"
+                "adcl 12(%1), %0        ;\n"
+                "adcl 0(%2), %0         ;\n"
+                "adcl 4(%2), %0         ;\n"
+                "adcl 8(%2), %0         ;\n"
+                "adcl 12(%2), %0        ;\n"
+                "adcl %3, %0            ;\n"
+                "adcl %4, %0            ;\n"
+                "adcl $0, %0            ;\n"
+                : "=&r" (sum)
+                : "r" (saddr), "r" (daddr),
+                  "r"(htonl(len)), "r"(htonl(proto)), "0"(sum));
+        return csum_fold(sum);
+}
+/*
+ *      Copy and checksum to user
+ */
+#define HAVE_CSUM_COPY_USER
+static __inline__ unsigned int csum_and_copy_to_user(const unsigned char *src,
+                                                     unsigned char __user *dst,
+                                                     int len, int sum, 
+                                                     int *err_ptr)
+{
+        might_sleep();
+        if (access_ok(VERIFY_WRITE, dst, len))
+                return csum_partial_copy_generic(src, (__force unsigned char *)dst, len, sum, NULL, err_ptr);
+        if (len)
+                *err_ptr = -EFAULT;
+        return -1; /* invalid checksum */
+}
+#endif

diff --git a/include/asm-i386/checksum.h b/include/asm-i386/checksum.h new file mode 100644 index 000000000000..d76a5f081c91 --- /dev/null +++ b/include/asm-i386/checksum.h
@@ -0,0 +1,192 @@
	1	#ifndef _I386_CHECKSUM_H
	2	#define _I386_CHECKSUM_H
	3
	4	#include <linux/in6.h>
	5
	6	/*
	7	* computes the checksum of a memory block at buff, length len,
	8	* and adds in "sum" (32-bit)
	9	*
	10	* returns a 32-bit number suitable for feeding into itself
	11	* or csum_tcpudp_magic
	12	*
	13	* this function must be called with even lengths, except
	14	* for the last fragment, which may be odd
	15	*
	16	* it's best to have buff aligned on a 32-bit boundary
	17	*/
	18	asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
	19
	20	/*
	21	* the same as csum_partial, but copies from src while it
	22	* checksums, and handles user-space pointer exceptions correctly, when needed.
	23	*
	24	* here even more important to align src and dst on a 32-bit (or even
	25	* better 64-bit) boundary
	26	*/
	27
	28	asmlinkage unsigned int csum_partial_copy_generic(const unsigned char src, unsigned char dst,
	29	int len, int sum, int src_err_ptr, int dst_err_ptr);
	30
	31	/*
	32	* Note: when you get a NULL pointer exception here this means someone
	33	* passed in an incorrect kernel address to one of these functions.
	34	*
	35	* If you use these functions directly please don't forget the
	36	* verify_area().
	37	*/
	38	static __inline__
	39	unsigned int csum_partial_copy_nocheck (const unsigned char src, unsigned char dst,
	40	int len, int sum)
	41	{
	42	return csum_partial_copy_generic ( src, dst, len, sum, NULL, NULL);
	43	}
	44
	45	static __inline__
	46	unsigned int csum_partial_copy_from_user(const unsigned char __user src, unsigned char dst,
	47	int len, int sum, int *err_ptr)
	48	{
	49	might_sleep();
	50	return csum_partial_copy_generic((__force unsigned char *)src, dst,
	51	len, sum, err_ptr, NULL);
	52	}
	53
	54	/*
	55	* This is a version of ip_compute_csum() optimized for IP headers,
	56	* which always checksum on 4 octet boundaries.
	57	*
	58	* By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
	59	* Arnt Gulbrandsen.
	60	*/
	61	static inline unsigned short ip_fast_csum(unsigned char * iph,
	62	unsigned int ihl)
	63	{
	64	unsigned int sum;
	65
	66	__asm__ __volatile__(
	67	"movl (%1), %0 ;\n"
	68	"subl $4, %2 ;\n"
	69	"jbe 2f ;\n"
	70	"addl 4(%1), %0 ;\n"
	71	"adcl 8(%1), %0 ;\n"
	72	"adcl 12(%1), %0 ;\n"
	73	"1: adcl 16(%1), %0 ;\n"
	74	"lea 4(%1), %1 ;\n"
	75	"decl %2 ;\n"
	76	"jne 1b ;\n"
	77	"adcl $0, %0 ;\n"
	78	"movl %0, %2 ;\n"
	79	"shrl $16, %0 ;\n"
	80	"addw %w2, %w0 ;\n"
	81	"adcl $0, %0 ;\n"
	82	"notl %0 ;\n"
	83	"2: ;\n"
	84	/* Since the input registers which are loaded with iph and ipl
	85	are modified, we must also specify them as outputs, or gcc
	86	will assume they contain their original values. */
	87	: "=r" (sum), "=r" (iph), "=r" (ihl)
	88	: "1" (iph), "2" (ihl)
	89	: "memory");
	90	return(sum);
	91	}
	92
	93	/*
	94	* Fold a partial checksum
	95	*/
	96
	97	static inline unsigned int csum_fold(unsigned int sum)
	98	{
	99	__asm__(
	100	"addl %1, %0 ;\n"
	101	"adcl $0xffff, %0 ;\n"
	102	: "=r" (sum)
	103	: "r" (sum << 16), "0" (sum & 0xffff0000)
	104	);
	105	return (~sum) >> 16;
	106	}
	107
	108	static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
	109	unsigned long daddr,
	110	unsigned short len,
	111	unsigned short proto,
	112	unsigned int sum)
	113	{
	114	__asm__(
	115	"addl %1, %0 ;\n"
	116	"adcl %2, %0 ;\n"
	117	"adcl %3, %0 ;\n"
	118	"adcl $0, %0 ;\n"
	119	: "=r" (sum)
	120	: "g" (daddr), "g"(saddr), "g"((ntohs(len)<<16)+proto*256), "0"(sum));
	121	return sum;
	122	}
	123
	124	/*
	125	* computes the checksum of the TCP/UDP pseudo-header
	126	* returns a 16-bit checksum, already complemented
	127	*/
	128	static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
	129	unsigned long daddr,
	130	unsigned short len,
	131	unsigned short proto,
	132	unsigned int sum)
	133	{
	134	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
	135	}
	136
	137	/*
	138	* this routine is used for miscellaneous IP-like checksums, mainly
	139	* in icmp.c
	140	*/
	141
	142	static inline unsigned short ip_compute_csum(unsigned char * buff, int len)
	143	{
	144	return csum_fold (csum_partial(buff, len, 0));
	145	}
	146
	147	#define _HAVE_ARCH_IPV6_CSUM
	148	static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
	149	struct in6_addr *daddr,
	150	__u32 len,
	151	unsigned short proto,
	152	unsigned int sum)
	153	{
	154	__asm__(
	155	"addl 0(%1), %0 ;\n"
	156	"adcl 4(%1), %0 ;\n"
	157	"adcl 8(%1), %0 ;\n"
	158	"adcl 12(%1), %0 ;\n"
	159	"adcl 0(%2), %0 ;\n"
	160	"adcl 4(%2), %0 ;\n"
	161	"adcl 8(%2), %0 ;\n"
	162	"adcl 12(%2), %0 ;\n"
	163	"adcl %3, %0 ;\n"
	164	"adcl %4, %0 ;\n"
	165	"adcl $0, %0 ;\n"
	166	: "=&r" (sum)
	167	: "r" (saddr), "r" (daddr),
	168	"r"(htonl(len)), "r"(htonl(proto)), "0"(sum));
	169
	170	return csum_fold(sum);
	171	}
	172
	173	/*
	174	* Copy and checksum to user
	175	*/
	176	#define HAVE_CSUM_COPY_USER
	177	static __inline__ unsigned int csum_and_copy_to_user(const unsigned char *src,
	178	unsigned char __user *dst,
	179	int len, int sum,
	180	int *err_ptr)
	181	{
	182	might_sleep();
	183	if (access_ok(VERIFY_WRITE, dst, len))
	184	return csum_partial_copy_generic(src, (__force unsigned char *)dst, len, sum, NULL, err_ptr);
	185
	186	if (len)
	187	*err_ptr = -EFAULT;
	188
	189	return -1; /* invalid checksum */
	190	}
	191
	192	#endif