^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Network checksum routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1999, 2003 Hewlett-Packard Co
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Stephane Eranian <eranian@hpl.hp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Most of the code coming from arch/alpha/lib/checksum.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * This file contains network checksum routines that are better done
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * in an architecture-specific manner due to speed..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/byteorder.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static inline unsigned short
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) from64to16 (unsigned long x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* add up 32-bit words for 33 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) x = (x & 0xffffffff) + (x >> 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) /* add up 16-bit and 17-bit words for 17+c bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) x = (x & 0xffff) + (x >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /* add up 16-bit and 2-bit for 16+c bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) x = (x & 0xffff) + (x >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /* add up carry.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) x = (x & 0xffff) + (x >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) return x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * computes the checksum of the TCP/UDP pseudo-header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * returns a 16-bit checksum, already complemented.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) __sum16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) __u8 proto, __wsum sum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return (__force __sum16)~from64to16(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) (__force u64)saddr + (__force u64)daddr +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) (__force u64)sum + ((len + proto) << 8));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) EXPORT_SYMBOL(csum_tcpudp_magic);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) __wsum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) __u8 proto, __wsum sum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) unsigned long result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) result = (__force u64)saddr + (__force u64)daddr +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) (__force u64)sum + ((len + proto) << 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /* Fold down to 32-bits so we don't lose in the typedef-less network stack. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /* 64 to 33 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) result = (result & 0xffffffff) + (result >> 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /* 33 to 32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) result = (result & 0xffffffff) + (result >> 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return (__force __wsum)result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) EXPORT_SYMBOL(csum_tcpudp_nofold);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) extern unsigned long do_csum (const unsigned char *, long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * computes the checksum of a memory block at buff, length len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * and adds in "sum" (32-bit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * returns a 32-bit number suitable for feeding into itself
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * or csum_tcpudp_magic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * this function must be called with even lengths, except
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * for the last fragment, which may be odd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * it's best to have buff aligned on a 32-bit boundary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) __wsum csum_partial(const void *buff, int len, __wsum sum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) u64 result = do_csum(buff, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /* add in old sum, and carry.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) result += (__force u32)sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) /* 32+c bits -> 32 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) result = (result & 0xffffffff) + (result >> 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return (__force __wsum)result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) EXPORT_SYMBOL(csum_partial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * this routine is used for miscellaneous IP-like checksums, mainly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * in icmp.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) __sum16 ip_compute_csum (const void *buff, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return (__force __sum16)~do_csum(buff,len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) EXPORT_SYMBOL(ip_compute_csum);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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